WO1999058019A1

WO1999058019A1 - Toothbrush

Info

Publication number: WO1999058019A1
Application number: PCT/JP1999/002469
Authority: WO
Inventors: Atsushi Yamamoto; Shinya Sakurai; Kazushi Ebisudani
Original assignee: Sunstar Inc.
Priority date: 1998-05-13
Filing date: 1999-05-12
Publication date: 1999-11-18
Also published as: CN1148131C; CA2331186A1; EP1080663A1; KR100581613B1; KR20010071168A; CN1299245A; ID28002A

Abstract

A toothbrush enhanced in a portions-between-teeth cleaning performance without sacrifice in a smooth-surface cleaning performance; specifically a toothbrush which is capable of, as its main theme, enhancing a portions-between-teeth cleaning performance and providing durability for maintaining the performance and which is, as its sub-theme, excellent in appearance and durability. To attain the main theme, tuft holes formed in a block head are in an approximately oval or rectangular shape, the tuft holes are inclined with respect to the block head surface and mono-filaments in rectangular cross section are used to increase a cleaning performance. To attain the sub-theme, a method of driving parallel lines are disclosed such that adjacent tuft holes are staggered with each other so that the driven parallel lines do not lie on a linear line.

Description

Specification

Toothbrush technical field

The present invention relates to a toothbrush which is excellent in cleaning properties for interdental parts and cervical parts and cleaning properties for smooth surfaces such as tooth surfaces. Background art

The toothbrush cleans, that is, brushes the teeth in the oral cavity by the repulsive force of the monofilament of the hair bundle implanted in the implanted hole of the handle. Since the greater the repulsion, the greater the cleaning effect, a toothbrush that basically has a high repulsion in the brushing direction is required. In addition, the toothbrush needs to be devised so that it can exert its own cleaning power on each part according to the condition of the part to be cleaned. There are various types of cleanliness according to the condition of the part to be cleaned, and typical ones are cleanliness for smooth tooth surfaces and cleanliness for intricate details. The intricate details include the interdental area, the cervical area, and the occlusal surface. Above all, the interdental area, which is the corner area, is liable to deposit food residues and plaque, The ability to clean the interdental area is of particular importance, as it often causes periodontal disease. As described above, toothbrushes have a general problem of increasing the repulsive force, and at the same time, have a problem of improving the cleaning effect on interdental portions while maintaining a cleaning effect on smooth surfaces. Is waiting.

Conventionally, a toothbrush disclosed in Japanese Patent Application Laid-Open No. 9-149815 by the present applicant has been developed to meet such a purpose. This toothbrush has, in a bristle bundle constituting a flocking portion, a bristle bundle having a substantially elliptical cross-sectional shape widened in the longitudinal direction of a handle and having a tip converged in a roof shape. At least one or more. Such a bundle has a different amount of filament accumulation depending on the direction. Therefore, it is possible to improve the smoothness of the clean surface by matching the direction in which the bristle is strong with the brushing direction.In addition, since the tip of the hair bundle converges, it is easy to insert details such as between teeth. Also has a great advantage of being excellent.

On the other hand, as a technology specializing in improving the insertability into the interdental area, a hair bundle converging section is constructed by inclining adjacent bristle bundles so as to support each other and bringing the bristle bundles into contact at the tips. Some have done it. Since the bristle bundle converging part has high density and strong bristle, and the bristle bundles are not easily disintegrated, the supporting direction is set according to the brushing direction, so that it can be applied to the interdental region and the cervical region. There is an advantage that a toothbrush which is excellent in the detail insertion of the toothbrush and has improved cleaning properties for these parts can be obtained.

Apart from the idea of the hair bundle, attempts have been made to increase the repulsion of the monofilament itself.

In order to increase the repulsive force of the monofilament, it is common practice to increase the diameter of the monofilament having a circular cross section and to make the material of the monofilament harder. There is a problem in trying to improve power. This is because if the diameter of the monofilament is increased or the material is changed to a hard material, the stimulation of the tissue in the oral cavity due to the contact with the monofilament may be felt too strong. This is because it is sometimes difficult for the hair tips to reach the gap.

By the way, when discussing the cleaning power of a toothbrush, it is necessary to consider its relationship with the brushing method. As a brushing method, instead of the conventional rolling method of cleaning the teeth by rolling the handle in the width direction, a scrubbing method of cleaning the teeth by moving the handle back and forth in small increments in recent years has recently been adopted. Therefore, the improvement of cleaning power should be considered mainly by the scrubbing method.

As described above, a toothbrush that is suitable for brushing by the scrubbing method, has a high cleaning effect, and has excellent smooth surface cleaning properties and fine cleaning properties is required. Appearance and durability cannot be ignored. For example, for the appearance of a toothbrush, it is important that monofilaments are evenly distributed in the flocked holes and beautiful wool is realized. It is important that the hair tips do not spread (the so-called “sagging”) and cracks do not occur in the flock during use. Disclosure of the invention

The toothbrush of the present invention is characterized in that the flocking hole formed in the flocking portion is substantially elliptical or substantially rectangular, and the flocking hole is inclined with respect to the flocking surface. The hair bundle is fixed to the flocking hole using a flat line as in the past, but with this toothbrush, the flocking hole has a substantially elliptical shape or a substantially rectangular shape, and is inclined with respect to the flocking surface. The implanted hair bundle has a substantially elliptical or substantially rectangular cross-sectional shape, and becomes a hair bundle inclined with respect to the flocking surface.

Since the inclination of the hair bundle is due to the inclination of the flocking hole itself, the inclined state is maintained even when stress is repeatedly applied during the use process.

Also, the flocked holes have a substantially elliptical shape or a substantially rectangular shape, and the number of the filaments constituting the bristle bundle differs between the wide and narrow directions of the bristle bundle. The difference comes out. Therefore, by setting the longitudinal direction of the flocking hole in consideration of the brushing method, a high hair stiffness can be obtained, and an excellent cleaning effect can be obtained. Here, the waist is a concept expressed by the magnitude of the repulsive force (restoring force) that acts when the hair bundle is deformed under pressure.

In addition, a converging portion having a large repulsive force is formed at a tip portion of a converging block of the hair bundle formed by supporting the inclined hair bundles. This tip can be easily inserted into intricate details such as between teeth and cervical cervix, and the inserted hair bundle can be used to clean these parts vigorously.

When the flocked hole has a substantially elliptical shape, the hair bundle can be streamlined, so that the contact resistance when starting to contact the teeth can be reduced.

The arrangement direction of the substantially oval or substantially rectangular flocking holes is selected according to the brushing operation. For example, in a scrubbing method or a bath method in which reciprocation is mainly performed in the longitudinal direction of the handle, the longitudinal direction of the flocking hole is made to extend along the longitudinal direction of the handle. Here, the expression “along the longitudinal direction” includes not only a state parallel to the longitudinal direction but also a slightly inclined state. When the longitudinal direction of the flocking hole is aligned with the longitudinal direction of the handle, the repulsive force of the monofilament in the brushing direction can be increased when brushing the tooth by the scrubbing method. Therefore, when the handle is reciprocated in small increments in the longitudinal direction, the repulsive force of the monofilament can be increased, and the repulsive force can satisfactorily brush the teeth and enhance the cleaning effect.

In addition, especially when the flocked holes formed along the longitudinal direction of the handle are substantially elliptical, when brushing the teeth by the scrubbing method, both ends of the bristle bundle in the longitudinal direction of the handle become curved narrow tops. However, it becomes easier for the monofilament to enter between the teeth, and the cleaning effect can be further enhanced.

It is preferable that the flocked holes face each other and are inclined inwardly to form a pair of hair bundles, and at least one of the bundles is provided.

It is desirable to set the inclination of the inclined hole with respect to the vertical direction in the range of 2 to 10 °.

The monofilament constituting the hair bundle implanted in the hair implantation hole may have a circular cross section, but is more preferably a rectangular cross section. When a monofilament having a rectangular cross section is used, and the hair is implanted in the longitudinal direction in the cross-sectional shape of the monofilament, that is, the long side is along the longitudinal direction of the implanted hole, the repulsive force of the monofilament when brushing is performed by the scrubbing method. Can be further enhanced. At this time, the stimulus felt in the oral cavity is correlated with the cross-sectional area of the monofilament. If the cross section of the monofilament is small, the irritation is also small. When comparing a monofilament with a circular cross section and a monofilament with a rectangular cross section, the cross-sectional area required to obtain the same repulsive force is smaller for a monofilament with a rectangular cross section, so that a toothbrush using a monofilament with a rectangular cross section is used in the oral cavity. Irritation to the tissue can be reduced.

It is preferable that the hair bundle implanted in the slanted hair implantation hole constitutes a pair of converging blocks by leaning two facing hair bundles on each other, and that a plurality of these converging blocks are provided.

It is preferable that the tip of each bristle bundle is processed into a mountain-cut shape from the viewpoint of improving the cleanability in detail.

By making the tip a mountain-cut shape, the detail cleaning performance is further enhanced. In particular, In the case of a mountain-cut shape in which slopes are formed on both sides in the direction perpendicular to the direction in which the bundles of hairs lean against each other, the cleaning ability in the handle width direction as well as the cleaning in the handle longitudinal direction is enhanced. . The number of filaments included in one bundle forming a mountain-cut shape is larger than that of a general toothbrush forming one mountain in two bundles, and the repulsive force of the hair bundle is extremely strong.

Further, the number and arrangement of the converging blocks constituted by the pair of hair bundles leaning and joining together can be set as appropriate, but it is preferable to provide at least a converging block at the front end or the rear end in the longitudinal direction of the handle. .

It is preferable that the next row of convergence blocks be positioned behind the gap formed between the convergence blocks arranged in the front row in the longitudinal direction of the handle. In this way, the remaining row of the converging block in the front row is polished by the converging block in the next row. The smooth surface will be polished throughout.

The bristle bundle is bent at the center position in the longitudinal direction, and is embedded in the flocking hole by a flat line having a length crossing the bent portion, whereby the bristle bundle is fixed and supported in the flocking hole. When fixing the bristle bundle to the flocking hole using a flat wire in this way, the flat wire is driven in a position substantially parallel to the long side or the short side of the flocking hole and at a position that bisects the opening area of the flocking hole. To do. By doing so, the filling state of the filaments pressed into the respective areas defined by the flat lines is made uniform, and it is possible to eliminate hair loss due to the density of the filling density. The appearance after flocking is also beautifully arranged.

When the flat line is arranged in a posture substantially parallel to the longitudinal direction of the flocking hole, it is desirable that the flat line is arranged within ± 10 ° with respect to a center line along the longitudinal direction of the flocking hole.

By the way, if the flat wire is driven into the flocking hole in such a posture, the flat line will be substantially aligned, and as a result, the possibility of a base crack starting from the press-fitting point of the flat wire increases. In order to avoid this, the formation position of the flocking hole may be shifted so that the center of the flocking hole does not line up in a straight line in the longitudinal direction of the handle.

It is preferable that the existing range of the flocking hole is in the range of 10 to 30 nun in the longitudinal direction of the handle and 5 to 15 bandages in the width direction of the handle. The presence of a flocked hole like this By defining the range, the size of the brush brush cleaning surface is defined as a result. If the area where the flocked holes are present is within the above range, the operability in the mouth does not decrease while the smooth surface such as the front teeth can be efficiently polished.

In the case of a substantially rectangular flocking hole, it is preferable that the short side of the flocking hole is set to a size range of 0.8 to 2.0 and the long side is set to a size range of 1.5 to 5.0 thigh. If the size of one flocking hole is within this range, the size of the tip of the converging portion formed by the support of adjacent bristle tufts is important for realizing both smoothness cleaning and detail cleaning. It will be optimal. It is preferable that the separation distance at the base of the pair of hair bundles constituting the converging block is set in the range of 0.2 to 4.0 thighs. By setting the angle of inclination of the bristle bundle constituting the converging block in the range of 2 to 10 ° as described above and setting the separation distance to 0.2 to 4.0 thigh, the converging shape can be obtained even during long-term use. Collapse can be prevented.

As a more specific configuration of the toothbrush obtained in this way, five rows of bristle bundles are provided in the longitudinal direction of the flocking table, and the first row and the fifth row are converging blocks at the center in the width direction of the flocking table. In the second and fourth rows, two converging blocks are arranged on both sides of the center of the flocking table in the width direction, and in the third row, one converging block is arranged in the center of the flocking table in the width direction. It is conceivable that one independent hair bundle is arranged outside the convergence block in the same direction as the hair bundle constituting the convergence block and inclined at an angle range in which the tip does not contact the convergence block. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view showing the overall configuration of the toothbrush of the present invention, FIG. 2 is a perspective view showing a flocking portion of a representative embodiment of the present invention, FIG. 3 is a plan view of the flocking portion, and FIG. Front view of the flocking section, Fig. 5 is a left side view of the flocking section viewed from the front end side, Fig. 6 is a plan view showing the shape and arrangement of flocking holes formed in the flocking table, and Fig. 7 is Fig. 6 is a sectional view taken along the line I-I in Fig. 6, Fig. 8 is a sectional view taken along the line IV-IV in Fig. 6, Fig. 9 is a sectional view taken along the line m-m in Fig. 6, and Fig. 10 is a IV-IV sectional view in Fig. 6. FIG. 11 is a sectional view taken along line V--V in FIG. 6, FIG. 11 is an explanatory view showing a mode of driving a flat wire into a flocking hole, and an arrangement of flocking holes into which the flat line is driven; Fig. 13 shows how a flat wire is driven into the flocking hole and this flat wire FIG. 14 is an explanatory view showing the arrangement of the flocking holes into which the flat lines are driven, and FIG. 14 is an explanatory view showing an arrangement of the flat lines into the flocking holes in the conventional toothbrush, and the arrangement of the flocking holes into which the flat lines are driven. FIG. 15 is an explanatory view showing a hair bundle tip portion in a mountain-cut shape, FIG. 16 is a modified example of the mountain-cut shape, FIG. 17 is a modified example of the mountain-cut shape, and FIG. 18 is a mountain-cut shape FIG. 19 is an explanatory view showing a tooth row, FIG. 20 is an explanatory view showing a state where a flocked portion is applied to the front of the tooth row, and FIG. FIG. 22 is an explanatory view showing the brushing state, FIG. 22 is an explanatory view showing the brushing of the molars, FIG. 23 is an explanatory view showing the movement of the molars sequentially moving between the bristle bundles, Fig. 24 shows a modified example of the hair bundle array, Fig. 25 is an explanatory diagram of the verification part of the smooth surface cleaning performance and detail cleaning performance, and Fig. 26 shows the comprehensive evaluation of the smooth surface cleaning performance and corner cleaning performance. Graph showing, Figure 27 Is a graph showing the evaluation of the cleanability of corners, Fig. 28 is a graph showing the evaluation of the cleanliness of a smooth surface, and Fig. 30 is a monofilament with a rectangular face cut into a roughly oval-shaped flocking hole FIG. 31 is a cross-sectional view showing a flocked portion of the second embodiment, and FIG. 31 is a plan view showing a flocked portion of a modified example in which the number and arrangement of flocked holes are changed in the same embodiment. FIG. Fig. 33 is an explanatory view showing a rectangular flocking hole with a circular monofilament implanted, Fig. 33 is an explanatory diagram showing an oval flocking hole with a rectangular monofilament implanted, and Fig. 34 is a monofilament with a rectangular cross section Fig. 35 shows the flow of molten synthetic resin when forming a rectangular flocking hole. Fig. 36 shows the oval flocking hole. Explanatory drawing showing the flow of molten synthetic resin when molding Good form

Hereinafter, the present invention will be described in detail based on illustrated embodiments. In the following description, unless otherwise specified, the longitudinal direction refers to the longitudinal direction of the handle, and the width direction refers to the width direction of the handle. The handle longitudinal direction is the same direction as the flocking table longitudinal direction, and the handle width direction is the same direction as the flocking table width direction.

Fig. 1 shows the handle before hair bristle implantation. The toothbrush of the present invention is characterized by the mode of the flocked portion indicated by A in the figure, and the shape of the neck portion B and the grip portion C is arbitrary. Hereinafter, the configuration of the flocking section A will be described.

The feature of the toothbrush of the present invention is that the opening shape of the flocking hole formed in the flocking portion is substantially oval. Or a substantially rectangular shape, and the flocking holes are inclined with respect to the flocking surface. It is important to note that the resilience when brushing in the longitudinal direction and the width direction of the flocking hole differs due to the fact that the flocking hole has a substantially elliptical shape or a substantially rectangular shape. In addition, a large repulsive force is obtained, and in addition to this, the flocking holes are inclined, and the tips of the bristle bundles implanted in the flocking holes have a shape that converges in the inclined direction, so that cleaning properties for details are improved. (Hereinafter referred to as detail cleaning).

A hair bundle to be implanted in the hair implantation hole is configured by assembling monofilaments. The cross-sectional shape of the monofilament is not limited. A monofilament having a generally circular cross section may be used, or a monofilament having a rectangular cross section may be used as described later. When a monofilament having a rectangular cross section is used, the repulsive force in the longitudinal direction of the monofilament cross section is used. Becomes big. In addition, since the cross-sectional area required to obtain the same repulsive force can be made smaller than that of a monofilament having a circular cross section, the stimulation of the tissue in the oral cavity becomes mild. Hereinafter, embodiments of the toothbrush of the present invention will be described. In the description of the embodiment, first, a case where a monofilament having a circular cross section is planted in a rectangular flocking hole will be described, and then a case where a monofilament having a circular cross section will be planted in an oblong flocking hole. explain. Example in which monofilaments with a circular cross section are implanted in rectangular implanted holes> Fig. 2 shows the appearance of the implanted portion of a typical embodiment, Fig. 3 is a plan view of the implanted portion, and Fig. 4 is a front view Fig. 5 is a side view of the flocking portion as viewed from the front end side. In this embodiment, the flocking hole has a rectangular shape, and a monofilament having a circular cross section is used.

In the flocking section A, the hair bundles 11, 12, 21-24, 31-34, 41-44, 51, 52 are arranged in five rows in the longitudinal direction, and the maximum in the width direction. Four rows of hair bundles are arranged. In FIGS. 7 to 11, the vertical cross-sectional shape of the flocking hole into which the bristle bundles are planted is indicated by adding “a j” to the reference numeral of the corresponding bristle bundle.

Each bristle bundle is set up from a rectangular flocking hole whose longitudinal side is aligned with the longitudinal direction of the handle. Then, the hair bundles that are adjacent to each other in the width direction of In this configuration, a block of hair bundles that converge toward the tip (hereafter referred to as a convergence block R) is formed in units of a pair of hair bundles facing each other, and a plurality of blocks of convergence blocks R are provided. Have. The convergence block R crosses the formation position of the convergence block R between the front row and the rear row so that when the brushing operation for reciprocating the handle in the longitudinal direction is performed, the entire tooth surface, which is a smooth surface, can be uniformly cleaned. Staggered from each other. In the center row in the longitudinal direction of the handle, the inner bristle bundles 32 and 33 are brought together, so that the outer bristle bundles 31 and 34 are isolated bristle bundles.

Here, the hair bundles 31 and 34 are slightly inclined inward, but may be upright.

The spacing W between the converging blocks R adjacent to the flocking table width direction is set slightly smaller than the average tooth width, and cleaning is performed when brushing that reciprocates the handle in the longitudinal direction is performed. The target tooth is pinched between the converging blocks R, and both sides of the tooth are sufficiently cleaned.

The hair bundles are tilted by inclining the hair implantation holes themselves and press-fitting the hair bundles into the inclined hair implantation holes using a flat wire. As a result of inclining the flocking hole itself, even when the acting force that breaks the inclining posture of the bristle bundle is repeatedly applied during brushing, the inclining posture of the bristle bundle can be maintained firmly.

The inclination of the flocking hole is described with reference to FIGS. FIG. 6 shows the arrangement of the flocked holes on the flocking table 1, and cross-sectional views of each of the five rows arranged in the longitudinal direction of the flocking table are shown in FIGS.

The inclination angle of the flocking hole may be set according to the strength of the hair to be obtained, but is usually set in the range of 2 ° to 10 ° with respect to the vertical direction of the inclined hole. If the inclination is smaller than 2 °, it is necessary to make the hair length extremely long in order to bring the tips of the facing hair bundles into contact with each other, which is not preferable. On the other hand, if it is larger than 10 °, it is difficult to form the handle. Further, it is preferable that the distance between the bases of the hair bundles constituting the converging block R be set in the range of 0.2 to 40. By setting the inclination and the separation distance to such values, sufficient durability can be exerted against the pressing force that repeatedly acts during use, and the converged shape can be maintained for a long time. The angle of inclination of the flocking hole may be changed depending on the position where the converging block R is formed, or may be the same as in this embodiment.

The bristle tips have a mountain-cut shape with a slope along the long side of the flocking hole to further enhance the insertion into interdental details, and the tip has a sharp mountain-cut shape to penetrate. Increases the effect of exposing plaque and food residues in the details.

As shown in FIG. 2, the size of the rectangular flocking hole is such that the short side S is 0.8 to 2.0 ridges and the long side L is 1.5 to 5.0 thighs. The direct surface pressure on the tooth surface depends on the shape of the tip of the bristle bundle, but if the size of the flocking hole is smaller than the above range, the pressing force to be transmitted to the tip of the bristle bundle is insufficient.

The reason for using a rectangular square hole as a flocking hole here is that brushing is performed by giving a difference depending on the direction to the number of accumulated filaments and giving repulsive force when the hair bundle is pressurized, that is, by giving direction to the hair waist. This is to obtain strong hair stiffness depending on the direction.Specifically, the long side of the flocking hole is formed along the longitudinal direction of the handle, so that reciprocation in the longitudinal direction of the handle is mainly performed. This is to ensure that strong hair is obtained when brushing is performed.

The area where the flocking holes exist is set in the range of 10 to 30 rows in the longitudinal direction of the handle, and in the range of 5 to 15 rows in the handle width direction. If the area where the flocked holes exist is too small, the contact area with the tooth surface is small and cleaning efficiency is reduced.

The hair bundle is fixed to the flocking hole by driving a flat line in the same way as a conventional toothbrush. The flat line is a metal plate having a size of about 1.6 mra X 0.22 thighs. It is inserted into a U-shaped bristle bundle and driven into the flocking hole with the bristle bundle. By fixing both ends in the direction to the peripheral wall of the flocking hole, the hair bundle is fixed to the flocking hole. In the conventional toothbrush, the flocked hole was circular, so the flat line was driven along the diameter of the flocked hole as shown in Fig. 14, but in the present invention, as shown in Fig. 12, A flat line P is inserted in a position parallel to the long side of the flocking hole H and at a position where the opening area of the flocking hole bisects the sections HI and H2. Also, in order to avoid the possibility of trap cracking as a result of the driven flat lines P being aligned on a straight line, the position of the flocked holes is slightly shifted in the width direction.

By accurately inserting a flat line so as to bisect the opening area, the area is divided by the flat line P. By eliminating the bias in the number of filaments contained in each of the defined compartments H1 and H2, the occurrence of hair loss is significantly reduced. Also, since the filament can be filled uniformly, the appearance after flocking is beautiful.

Although the processing of the hair bundle tip into a mountain-cut shape has already been described, FIG. 15 shows a hair bundle tip processed into a mountain-cut shape. In this example, the slopes r, r toward the top are provided along the bristle bundle wide direction. The present embodiment is also characterized in that a single bundle of hair forms the peak of the chevron. The slopes r, r toward the top of the chevron are perpendicular to the direction in which the hair bundles lean. By making the slope of the mountain-cut shape into this form, in addition to the convergence due to the contact between the hair bundles, the tip of the handle is narrowed in the direction orthogonal to the convergence direction by the mountain-cut shape, so that the handle In addition to being able to insert into the details when brushing in both directions of operation and left and right operation, it is effective to remove food residue and plaque by obtaining a sharp and strong hair tip. To be able to do it.

Although not shown, the slope toward the top of the chevron may be formed along the direction in which the hair bundles lean. Also, various shapes may be considered as long as they fall within the category of the mountain-cut shape.

For example, as shown in Fig. 16, a trapezoidal slope r1 is formed as a slope on the front and back sides in the direction in which the hair bundle leans, or an isosceles triangle as shown in Fig. 17. Those formed with r2, and those formed with a right-angled triangular slope r3 as shown in Fig. 18 can be appropriately adopted.

The configuration of the first embodiment, which is a typical embodiment, has been described above. Next, the operation of the toothbrush of this embodiment will be described.

As shown in FIG. 19, the toothbrush of the present invention has an excellent cleaning effect on the smooth surface Z1, and has an intricate portion between adjacent teeth Z2, an occlusal surface Z3 of a molar, etc. Although the cervical Z4 as shown in FIGS. 20 and 21 has an excellent cleaning effect, the interdental Z2 exerts a particularly remarkable cleaning effect. For example, FIG. 20 shows how the tooth surface is cleaned using the toothbrush of this embodiment. As shown in this figure, there is a gap SP between the convergence blocks R and R that constitute each row of the flocking section, and the corresponding position in the next row, which is the position behind this gap SP, is as follows. There is a column convergence block R. Therefore, if brushing is performed in which the handle is reciprocated in the direction of the arrow in the figure, the portion of the hair remaining in the front row is polished and the next row is polished, so that the toothbrush does not need to be moved up and down in the width direction of the handle. It is understood that cleaning can be performed efficiently without leaving the entire tooth surface unpolished. And since these tooth surfaces are brushed by the tip of the convergence block having strong hair, the scraping ability is excellent. In addition, when a pressing operation is performed on the tooth surface, a deforming force acts on the bristle bundle, but the converging block blocks the bristle bundles facing each other to support their inclined posture and reinforces their shape. Once it is deformed, it can be restored, and its cleaning ability does not deteriorate early in use.

FIG. 21 shows how the cervical part Z4 is cleaned. As shown in the figure, the converged tip of the converging block enters the cervix, and the food residue and plaque deposited on the cervical site can be effectively extracted.

Cleaning between teeth Z2 is performed by reciprocating the toothbrush in the vertical direction, but this reciprocating operation may be performed along the longitudinal direction of the teeth in the dentition direction or perpendicular to the dentition direction. It may be performed in a posture. In the former case, the fact that the tip of the bristle bundle has a mountain-cut shape greatly contributes to the improvement in the insertion between teeth.

On the other hand, in the latter case, the converging shape of the tip of the bristle bundle that is leaning ensures insertion between teeth and allows sediment between teeth to be extracted.

Fig. 22 shows the occlusal surface Z3 of the molar tooth being brushed by the third row of hair bundles in the implanted portion. In this case, the tip of the converging hair bundle of the converging block R composed of two bundles leaning inside penetrates deeply into the intricate groove of the occlusal surface Z3, and the sediment on the occlusal surface Z3 is pushed with strong hair. The outer two bundles, on the other hand, function to hold the molars and clean both sides of the molars. Here, the third row, which is most effective in cleaning the occlusal surface Z3, has been described as an example. The insertability can be exhibited.

The toothbrush of this embodiment also has the following characteristic cleaning action. For example, when brushing molars, the mechanism shown in Fig. 23 works. For example, when brushing the occlusal surface along the dentition, the first molar is the first 丄 * i

At the position, it contacts the convergence block R1 in the first row and its front surface in the traveling direction is cleaned. Then, after the occlusal surface was cleaned by the convergence block R1 riding on the occlusal surface, the target posterior teeth were separated from the second row of hair bundles as indicated by arrows in the figure, and the imaginary line in the figure. Move to the second position P2 indicated by. In this position, the target molar is surrounded by a bristle bundle, and the front surface in the advancing direction is cleaned by the central convergence block R3 in the third row. They are cleaned by the second row of tresses. The same operation is performed at the time of the next transition to the third position P3, and the target molar is sufficiently cleaned.

In the present embodiment, the mode of the second, third, and fourth rows of the hair bundle row that constitutes the flocking section is such that two pairs of converging blocks are arranged, or one pair of converging blocks in the center. The hair bundles are arranged so that a bundle of hairs slightly inclined inward is provided on each side, but the configuration of each hair bundle row is not limited to this. As shown in Fig. 24 (a), the bristle bundles located on both sides of the bristle row are inclined outward, or no convergence block is provided as shown in Fig. 24 (b). The four bundles of hair may all be inclined outward.

In order to confirm the cleaning effect of the toothbrush of this example, the present inventor compared a conventional toothbrush with a conventional toothbrush using a jaw model for smooth surface cleaning performance and fine cleaning performance.

In the comparative test, a toothbrush having the flocked form shown in Fig. 2 (hereinafter referred to as a prototype 1) was used as a toothbrush to substitute the present invention, and a commercially available product conventionally known was used as a comparative object. did. A comparative product A and a comparative product B were prepared as toothbrushes to be compared (hereinafter referred to as comparative products). Comparative product A is a toothbrush that has a substantially rectangular flocked hole and forms a mountain-cut shape in two bundles. Comparative product B is a toothbrush having a substantially rectangular flocked hole and having a hair cutting mode in which a bristle height is provided for each row of flocked holes in the longitudinal direction of the handle.

The lower right first molar was selected as the target site for comparison of cleanability. In addition, the detail cleaning property means cleaning property for intricate parts such as interdental, cervical, occlusal surfaces, etc. Here, only the corner cleaning property, which is cleaning property between teeth, was verified. The test method and test results are as follows.

First, spray on the jaw model to check the occlusion of the teeth (trade name "Occlude": Pascal) Four

) And brush the test toothbrush on the 頰 side of the molar teeth of the jaw model in the vertical occlusal state using a brushing simulator. Brushing is a posture in which the longitudinal direction of the handle is aligned with the tooth row direction (almost horizontal posture), and this toothbrush is reciprocated in the longitudinal direction of the handle. The brushing conditions are as follows. The brushing speed was set to 0 g, the brushing time was set to 6 seconds, the amplitude was set to 10 mm, the brushing speed was set to 37 mm per second, and the stroke time was set to 0.225 seconds.

After brushing the anterior teeth under these conditions, the cleaning result of the lower right first molar, which was the test site, was evaluated. At the time of evaluation, as shown in Fig. 25, the tooth surface of the molar was occupied by a 70% area of a "smooth surface" (portion indicated by F in the figure). The portion occupying% was defined as a “corner” (portion indicated by K in the figure), and the cleanability of both these portions was evaluated. The cleanability is calculated by subtracting the area of the soil after the cleaning test from the area of the soil before the cleaning test and dividing the result by the area of the soil before the cleaning test. is there. The results are shown in Tables 1 and 2, and the average values are shown in Figures 26, 27, and 28.

(table 1 )

(Table 2)

Prototype 1 Comparative product A Comparative product B

1 84. 8 64. 6 59. 5

2 88. 0 66. 7 73. 3

3 81.6 62.4 58.7 Average 84.8 64.6 63.8 As can be seen from the above results, the corner part cleanability was 32.8% for comparative product A and 43.6% for comparative product B, whereas the prototype as the product of the present invention was 54. A cleaning ratio as high as 5% was achieved, and with respect to the smooth surface cleaning performance, Comparative Example A was 64.6% and Comparative Example B was 63.8%, whereas the present invention Example As a prototype, a high ratio of cleanliness of 84.8% has been achieved. Here, only the cleaning of the corners was evaluated as the detail cleaning, but it is presumed that the same effect as between the teeth can be obtained with regard to the cleaning of the cervical region and the occlusal surface.

Although the above comparative test was performed using a jaw model, the present inventors conducted a clinical trial using the prototype and the comparative product A in the Faculty of Dentistry for the purpose of actually verifying the effects in the oral cavity in detail. Testing was also performed. The test method was as follows. After subjecting one subject to brushing at least twice a day for 7 days, the amount of plaque before and after brushing was measured, and the plaque removal rate by brushing was evaluated.

For the evaluation of plaque, six teeth were selected as representative teeth in the oral cavity, and after the test teeth were stained with a plaque stain, the height of plaque attached to six sites per tooth was 0.5 sq. Units. Was measured. Table 3 shows the results.

(Table 3)

The test of the difference between groups is by a paed t test. As shown in Table 3, in all the parts, the prototype according to the present invention obtained better results than the comparative product A. In addition, it was confirmed that there was a significant difference (risk ratio P <0.05) in all regions except the lower jaw. <Example in which a monofilament having a rectangular cross section is planted in an oval flocking hole>

Next, the present inventor produced a toothbrush in which a monofilament having a rectangular cross section was implanted in a flocking hole having an oblong opening shape and inclined with respect to the flocking surface, and considered this. FIG. 30 shows a flocked portion of the toothbrush. In the longitudinal direction of the flocking table, this toothbrush has one flocking hole 100, two flocking holes 110, 120, three flocking holes 130, 140, 1 5 0 is arranged, and the flocking hole 1 0 0 at the tip and the flocking hole 1 4 0 at the center of the 3 flocking holes at the rear end are vertical holes, and 2 flocking holes in the second row 1 1 0 and 120 are inclined at an angle of 3 ° toward each other (toward the center of the flocking table), and flocking holes 130 and 150 located on both sides of the central flocking hole 140 at the rear end. Are inclined at an angle of 3 ° toward each other, and monofilaments having a rectangular cross section are implanted in these implanted holes. In the figure, the collection of monofilaments is represented as a set of small rectangular bodies in each flocking hole, and the flat line is drawn across the center in the width direction of each flocking hole in the longitudinal direction. In this toothbrush, the hair bundles located on both sides in the width direction of the flocking table are tilted inward, so that when brushing is performed to reciprocate the handle in the longitudinal direction, the filaments move outward in the width direction of the flocking table. It is intended to prevent escape toward the head and reduce the repulsion due to the escape of the filament. Here, a toothbrush with a relatively small number of flocked holes and a relatively small size of the flocked bed is illustrated as an example. As shown in the drawing, various arrangements can be adopted, such as an arrangement having the same arrangement of flocking holes as in the above embodiment.

In the present embodiment, an oval flocking hole is targeted, but any shape close to an oval is included in the concept of a substantially oval shape defined in the present invention. The concept of a substantially elliptical shape is, in addition to the literally elliptical flocking hole 100 as shown in Fig. 33, and the substantially elliptical flocking hole 100 'as shown in Fig. 34. included.

In the embodiment described above, a monofilament having a circular cross section was implanted in the rectangular implanted hole 100 "as shown in FIG. 32, whereas in the present embodiment, such an oval or elliptical shape was used. The difference is that a monofilament having a rectangular cross section is implanted in a slanted implanted hole having an opening shape. By making the flocked holes oval and the lengthwise direction of the flocked holes along the lengthwise direction of the handle, that is, matching or almost matching, the cleanability of details can be further improved, and the base of the flocking table can be cracked. Can be almost eliminated, and the durability of the toothbrush can be improved.

The reason why the detail cleaning property is enhanced is that if the implanted hole is oval and the longitudinal direction of the implanted hole matches the longitudinal direction of the handle, the hair bundle implanted in the implanted hole is streamlined at both ends in the longitudinal direction of the handle This is because the width becomes narrow and the insertability into the details is improved. The reason for the breakage of the flocking table is eliminated and the durability of the toothbrush is increased for the following reasons.

The toothbrush is molded using an injection molding die, and the flocking table with the flocking holes is formed by filling a molten synthetic resin into the space (cavity) for forming the flocking table of the mold. In the cavity, there are a number of pins for forming flocking holes.Molten synthetic resin is poured around these pins for forming flocking holes, and after the synthetic resin is cured, the mold is opened, and at the same time, the pins for forming flocking holes are formed. A flocked hole is formed by pulling out. The flocking hole is formed in this manner, and a pin having a shape corresponding to the shape of the flocking hole to be obtained is used as the flocking hole forming pin, and the molten synthetic resin flows due to the shape of the flocking hole forming pin. The aspect is different, and this affects the bed split of the flocking table. For example, when the shape of the flocking hole is a rectangular hole, the corner portion 201 exists in the flocking hole forming pin 200 as shown in FIG. However, since the corner portion 201 exists, the molten synthetic resin that passes through the corner portion 201 and flows into the gap 205 between the adjacent flocked hole forming pin 210 and the flocked hole forming pin It is difficult to flow along the surface of 200, and as a result, it is not possible to perform good resin bonding when merging past the flocking hole forming pin 200. Therefore, cracks are likely to occur from a portion where the resin bonding is not sufficient, and particularly when a flat wire is driven in parallel with the longitudinal direction of the flocking hole, the flat wire is driven into a portion where the resin bonding is not sufficient. Therefore, a base crack is more likely to occur. This is particularly remarkable when the widthwise centerline of the adjacent flocking hole overlaps the extension line on the widthwise centerline of the flocking hole as shown in Fig. 35, that is, when the gap between the adjacent flocking hole is narrow. .

On the other hand, when the flocking hole is oval, the flocking is performed as shown in Fig. 36. The molten synthetic resin flows smoothly along the semicircular curved surface of the hole forming pin 300, and the resin bonds when the molten synthetic resin passes through the flocking hole forming pin 300 and merges. Is performed well, and the resin bonding is performed with sufficient strength. Therefore, the possibility of cracks can be drastically reduced, and a highly durable tooth brush that does not crack even if a flat wire is driven in parallel with the longitudinal direction of the flocking hole. be able to.

In this embodiment, since the longitudinal direction of the rectangular cross section is made to coincide with the longitudinal direction of the handle using a monofilament having a rectangular cross section, when the brushing method of reciprocating in the longitudinal direction of the handle is adopted, the repulsive force of the hair bundle is It is extremely large, and the bristle bundles located on both sides in the width direction of the flocking table are inclined inward, so that the filament does not escape when brushing is performed, and the repulsive force of the bristle bundle is effectively reduced Fired.

The present inventor conducted a test on a toothbrush using an oval-shaped flocking hole to examine how the presence or absence of the flocking hole and the difference in the cross-sectional shape of the monofilament affect the repulsion force when the brushing operation is performed. went. In the test, prototype 2 according to this example and comparative products C, D, and E in which monofilaments having a circular cross section were implanted were prepared, and the repulsive force of the monofilaments of these toothbrushes was compared. Of the toothbrushes used in the test, except for the comparative product C, the toothbrushes shown in Fig. 30 had the same shape and arrangement of the flocking holes as those shown in Fig. 30, and the comparative product C had 17 flocking holes. Was used. The implanted hole of comparative product C is a vertical hole with a circular cross-section of φθ.190 dia., And the implanted hole of comparative product D is a vertical hole of circular cross-section with a diameter of φ0.160. Is a vertical hole with a rectangular cross section of 0.25 4 mm X 0.16 2 mm, and the flocking hole of the prototype 2 of this embodiment is a flocking hole with a rectangular cross section of 0.25 4 mraX 0.16 2 pressure. Yes, as shown in FIG. 30, the four flocking holes located on the outer side in the width direction of the flocking table were inclined inward by 3 °. The measured repulsion force is "repulsion force per unit area in the longitudinal direction of the handle" and "repulsion force per unit area in the handle width direction", and the ratio of these two repulsion forces is calculated. It was expressed as "the ratio of repulsive force in the longitudinal direction to the width direction" and compared. The repulsive force of a monofilament is calculated according to the International Standard (ISO), and measures the reaction force generated when a resistance is applied to a 1/3 length portion of a monofilament and elastically deformed. The unit is expressed in Newton (N). Table 4 shows the results.

(Table 4)

As is clear from Table 4, the toothbrush of prototype 2 according to the present invention has a larger repulsive force per unit area in the longitudinal direction of the handle than all of the comparative products C, D, and E, and has a rebound in the longitudinal direction of eight handles. It was confirmed that the force was much larger than in the width direction. Thus, it was found that the toothbrush of prototype 2 according to the present invention was suitable for the brushing method in which the handle was reciprocated in the longitudinal direction of the handle as typified by the scrubbing method, and was a toothbrush having an excellent cleaning effect. . In addition, with regard to the repulsive force per unit area in the handle width direction, as can be seen from the fact that the prototype 2 according to the present invention is smaller than the comparative products C, D, and E, the toothbrush of the prototype 2 is compared with the comparative product CDE. This is not to increase the absolute value of the repulsion force, but to increase the repulsion force in the longitudinal direction of the handle by changing the distribution of the repulsion force acting in the longitudinal direction and width direction of the handle. However, the cleaning effect can be enhanced without increasing irritation to tissues in the oral cavity. This also confirms that the toothbrush of this example is a toothbrush extremely suitable for the scrubbing method.

In addition, the prototype 2 toothbrush (the comparative CDE is the same in this regard) However, since monofilaments are implanted in the substantially elliptical implanted holes extending in the longitudinal direction of the handle, both ends of the handle of the hair bundle in the longitudinal direction are formed into streamlined curved tops, and the width is adjusted. The teeth can be made narrower, and the teeth can be brought into contact with the narrow top of the curve, so that the contact resistance at the start of contact with the teeth can be reduced. As a result, when brushing the teeth by the scrubbing method, the monofilaments at both ends in the longitudinal direction of the handle of the bristle bundle can easily enter between the teeth, and this can increase the repulsive force of the monofilaments, thereby further improving the cleaning effect. Contribute to higher.

In addition, since the toothbrush of this embodiment uses an oval-shaped flocking hole, a portion between the flocking table and an adjacent flocking hole is unlikely to cause a trapezoidal crack. There is no fear of cracking. Therefore, in the toothbrush of this embodiment, as shown in FIG. 30, a flat line can be driven along the longitudinal direction of the flocking hole at the center in the width direction of the flocking hole extending in the longitudinal direction of the handle. As shown in Fig. 33, the hair bundles can be implanted symmetrically at the center in the width direction of the implanted holes, so that the density of the monofilaments located on both sides of the flat line can be made uniform. Therefore, all of the monofilaments can be directed almost perpendicularly to the flocked surface, the hair can be made good, and a good-looking toothbrush can be provided.

The present inventors conducted a test to determine how the difference in the flocking hole shape, the cross-sectional shape of the monofilament, and the difference in the driving direction of the flat wire affected the hairiness (appearance) of the monofilament. Appearance) was evaluated. Table 5 shows the test results. In Table 5, a to f are conventional toothbrushes, g is the toothbrush according to the present embodiment, h is the same as the above g, but the driving direction of the flat wire is the longitudinal direction of the handle. This is an example of tilting by 15 ° with respect to. (Table 5)

Evaluation of hairiness during flocking 毛: No problem

△: Hairiness is slightly bad

X: Bad hairiness As is clear from Table 5, when the planted hole is circular, the appearance of the toothbrush can be improved without being affected by differences in the cross-sectional shape of the monofilament and the direction of driving the flat wire. It can also be seen that the bristles (appearance) of the toothbrush are good even when a bunch of monofilaments having a circular cross section is driven into the oval-shaped flocking holes in parallel with the longitudinal direction of the handle.

On the other hand, in the case of an oval-shaped flocking hole, when the hair is driven along the longitudinal direction of the handle, the nap is good, but it should be crossed at an angle of 15 ° to the longitudinal direction of the handle. It can be seen that the hairiness is slightly inferior when a flat line is driven. When a monofilament having a rectangular cross section was implanted in the oval implanted hole, the hair was poor when the crosshair was crossed in the longitudinal direction of the handle and a flat wire was implanted, but was implanted parallel to the longitudinal direction of the handle. It was confirmed that the toothbrush of this example had good hairiness and good appearance. Industrial applicability

The toothbrush of the present invention can provide a difference in the repulsive force of the bristle bundle in the longitudinal direction and the lateral direction of the flocking hole because the flocking hole has a substantially elliptical shape or a substantially rectangular shape. The brushing effect can be enhanced by adjusting the direction of the movement. Moreover, since the flocking holes are inclined with respect to the flocking surface, controlling the inclination direction can also increase the brushing force in a specific direction. And since the flocking hole itself is inclined, even if the pressing force accompanying the brushing operation repeatedly acts, the inclined posture does not collapse, and a stable brushing force can be obtained over a long period of time. By setting the longitudinal direction of the flocking hole and the inclination direction of the hair bundle in accordance with the brushing direction, a toothbrush that improves both detailed cleaning of interdental, cervical and occlusal surfaces and cleaning of smooth surfaces on tooth surfaces Can be obtained. In particular, when the flocking hole has a substantially elliptical shape, the monofilaments located at both ends in the longitudinal direction of the flocking hole, which can reduce the contact resistance at the start of contact with the teeth because the bristle bundle can be streamlined and are narrow Can easily enter between the teeth, and the cleaning effect can be further enhanced.

When the longitudinal direction of the substantially elliptical or substantially rectangular flocking hole is aligned with the longitudinal direction of the handle, when brushing the teeth by the scrubbing method or the bus method, which mainly reciprocates in the longitudinal direction of the handle, the monofilament in the brushing direction The repulsion can be increased, and an excellent cleaning effect can be realized.

When at least one pair of flocking holes that incline inward with each other is provided, the bristle bundles planted in the flocking holes support each other to reinforce the bristle, and the tips converge. Therefore, it is possible to provide a toothbrush capable of penetrating into details between teeth, the cervix, and the occlusal portion, and for strongly removing the food residue and the teeth accumulated at these sites.

If the inclination of the inclined hole with respect to the vertical direction is set in the range of 2 to 10 °, the pressing force between the teeth, the cervix and the occlusal surface will be appropriate, and the degree of convergence of the hair bundle tip will also be appropriate. A toothbrush excellent in insertability between teeth and the like can be obtained.

When the monofilament constituting the hair bundle implanted in the flocking hole has a rectangular cross-section and the long side direction in the cross-sectional shape is along the longitudinal direction of the flocking hole, the monofilament with respect to the longitudinal direction of the flocking hole The repulsive force of the toothbrush can be increased, and the cleaning power of the toothbrush can be further increased. In addition, the cross-sectional area for obtaining the same repulsive force is smaller than that of a monofilament having a circular cross section, so that there is less stimulation to the oral tissues. When a pair of facing hair bundles are leaned on each other to form a converging block, and a plurality of such converging blocks are provided, there are places where the hair implantation part can exhibit strong hair stiffness while having excellent detail cleaning properties. Since multiple locations are formed, more efficient brushing can be performed.

If the tip of each hair bundle is processed into a mountain-cut shape, the detail cleaning property is further improved. In particular, in the case of a mountain-cut shape in which an inclined surface is formed before and after in the direction perpendicular to the direction in which adjacent bristle bundles lean, fine cleaning in the handle width direction and fine cleaning in the handle width direction are possible. The nature also increases.

At least the convergence blocks are provided at the front end and the rear end of the handle in the longitudinal direction of the handle, and the convergence blocks of the next row are provided behind the gap formed between the convergent blocks arranged in the front row in the handle longitudinal direction. When the convergence block in the front row is polished, the portion left behind by the convergence block in the front row will be polished by the convergence block in the next row. Can be polished over its entire area.

When the flat line used to drive the hair bundle into the flocking hole is driven in a position parallel to the long side or short side of the flocking hole and at a position that bisects the opening area of the flocking hole, The filling condition is uniform, and as a result, hair loss due to uneven packing density is eliminated and the appearance of the implanted portion becomes beautiful.

If the center of the flocking hole is not aligned on the straight line in the longitudinal direction of the bundle, it is possible to prevent the occurrence of a crack. Therefore, it is possible to increase the size of the flocking hole or to make the adjacent flocking hole closer.

If the flocked holes are in the range of 10 to 30 dragons in the longitudinal direction of the handle and 5 to 15 thighs in the width direction of the handle, the smooth surface can be polished efficiently, but in the mouth. The operability does not decrease.

When the flocked hole is substantially rectangular, the short side of the substantially rectangular flocked hole is set to 0.8 to 2.0 bandits, and the long side is set to 1.5 to 5.0 haze. The size of the tip of the convergent portion formed by the leaning is the most suitable for achieving both smoothness cleaning and detail cleaning.

As described above, the angle of inclination of the bristle bundle forming the convergence block is in the range of 2 to 10 °. When the distance is set to 0.2 to 4.0 awake, it is possible to prevent the convergent shape from being broken even during long-term use.

Five rows of bristle bundles are provided in the longitudinal direction of the flocking table, one converging block at the center of the bristle bed width direction in the first and fifth rows, and the center of the flocking table width direction in the second and fourth rows. In the third row, one converging block is placed at the center in the width direction of the flocking table, and the outer side of the converging block is in the same direction as the hair bundle forming the converging block. In addition, if one bundle of independent hair bundles is arranged, each of which is inclined at an angle where the tip does not touch the convergence block, the target site is cleaned by the first row of convergence blocks after the front surface in the traveling direction is cleaned. The hair bundles on the both sides in the width direction constituting the second row are separated by passing over the hair bundles, and both sides are brushed by the hair bundles in the second row, and the front face is applied to the third row. In contact with each other, and the same state from the third row to the fourth row It means that repeated even when moving to, toothbrush high cleaning effect is obtained.

Claims

The scope of the claims

I. A toothbrush in which the flocking holes formed in the flocking portion are substantially oval or substantially rectangular, and the flocking holes are inclined with respect to the flocking surface.

2. The toothbrush according to claim 1, wherein the longitudinal direction of the flocking hole is aligned with the longitudinal direction of the handle.

3. The toothbrush according to claim 1, wherein at least one set of a pair of flocking holes inclined inwardly from each other is provided.

4. The toothbrush according to any one of claims 1 to 3, wherein the slanted flocking holes have an inclination with respect to the vertical direction of 2 to 10 °.

5. The monofilament constituting the hair bundle implanted in the flocking hole has a rectangular cross section, and the long side direction in the cross sectional shape is along the longitudinal direction of the flocking hole. A toothbrush according to claim 1.

6. The toothbrush according to any one of claims 1 to 5, wherein a plurality of convergence blocks of a pair of bristle bundles are provided, the blocks being in contact with each other.

7. The toothbrush according to any one of claims 1 to 6, wherein a tip end of each of the planted hair bundles is processed into a mountain-cut shape.

8. The toothbrush according to claim 6, wherein the converging block is provided at least at a front end or a rear end in a longitudinal direction of the flocking table.

9. The toothbrush according to any one of claims 6 to 8, wherein a converging block of the next row is positioned at a position behind the gap formed between the converging blocks arranged in the front row in the longitudinal direction of the handle.

10 0. In order to embed and support the bristle bundle whose central part in the longitudinal direction is bent in the flocking hole, a flat line driven into the flocking table while being positioned at the bending portion of the bristle bundle, The toothbrush according to any one of claims 1 to 9, wherein the toothbrush is driven in a position substantially parallel to the short side and at a position that bisects the opening area of the flocking hole.

The toothbrush according to any one of claims 1 to 10, wherein the flat line is disposed within ± 10 ° with respect to a center line along a longitudinal direction of the flocking hole.

12. The toothbrush according to claim 11, wherein the centers of the flocking holes are not arranged in a straight line in the longitudinal direction of the handle.

13. The toothbrush according to any one of claims 1 to 12, wherein the area in which the flocked holes are present is in the range of 10 to 30 marauders in the longitudinal direction of the handle and 5 to 15 thighs in the handle width direction.

14. The flocked hole has a substantially rectangular shape, and the substantially rectangular flocked hole has dimensions of 0.8 to 2.0 thighs and long sides of 1.5 to 5.0 thighs. 13. The toothbrush according to any one of 13 above.

15. The toothbrush according to any one of claims 2 to 14, wherein a separation distance at a base portion of the pair of bristle bundles constituting the converging block is 0.2 to 4.0 mm.

16. Five rows of bristle bundles are provided in the longitudinal direction of the flocking table, one converging block at the center of the flocking table width in the first and fifth rows, and one in the width direction of the flocking table in the second and fourth rows. In the third row, two converging blocks are arranged on both sides of the center, and in the third row, one converging block is arranged at the center in the width direction of the flocking table, and a hair bundle constituting the converging block is located outside the converging block. The toothbrush according to any one of claims 6 to 5, wherein one independent bristle bundle is arranged in the same direction and at an angle within a range in which the tip does not contact the converging block.