WO2002032782A1

WO2002032782A1 - Foil cover with slanting tear line

Info

Publication number: WO2002032782A1
Application number: PCT/NL2001/000719
Authority: WO
Inventors: Louis Rinze Henricus Adrianus Willemsen
Original assignee: Weasy Pack International Ltd.
Priority date: 2000-10-05
Filing date: 2001-10-02
Publication date: 2002-04-25
Also published as: EP1334045B1; EP1334045A1; AU2002211076C1; AU1107602A; AU2002211076B2

Abstract

The invention relates to a container (1) with an opening enclosed by a substantially flat edge (2), wherein a cover sealing the opening is adhered to the edge wherein the cover is provided with a pull-tab (4) extending outside the edge, and wherein the cover is manufactured from a flexible, tearable material, wherein the pull line (6), which extends between the distal end of the pull-tab and the middle of that part of the edge adjacent to the pull-tab, extends at a distance from the centre of gravity of the opening. Because the pull line extends in a different direction, the user will tend to grasp the container in a different direction and then pull in a different, nonradial direction. A blind channel extending from the content of the container is preferably recessed between the cover and the continuation of the edge, wherein the tear caused when the pull-tab is pulled intersects the channel.

Description

FOIL COVER WITH SLANTING TEAR LINE

The invention relates to a container with an opening enclosed by a substantially flat edge, wherein a cover sealing the opening is adhered to the edge, wherein the cover is provided with a pull-tab extending outside the edge, and wherein the cover is manufactured from a flexible, tearable material.

Here "flat" is also understood to mean a configuration wherein the upper surface of the edge lies in a flat plane, but wherein for instance a groove or ridge is arranged in the edge.

Such a container is known inter alia from EP-A-0 880 455. They are used for packaging portions of condensed milk, and for mayonnaise, salad dressing and the like, but it is equally possible to use these containers for other types of product such as cosmetics. In such prior art containers the pull line extends from the distal end of the pull-tab to the centre of the container. The user of the container will therefore grasp the container between thumb and forefinger of one hand and then pull the pull-tab open toward the centre of the container with the thumb and forefinger of the other hand. During this pulling open there is at least one discontinuity encountered in the forces necessary to pull loose the tab and to be generated with the hands. A significant discontinuity is formed by the position at which the loosened tab leaves the sealing seam between the cover and the upper edge of the container and continues into the cover; in order to pull loose, break through, tear through or tear a sealing seam quite a large amount of force is required, while thereafter it is only necessary to generate a force for tearing loose the foil or other type of material from which the cover is manufactured. As a result of this discontinuity an uncontrolled movement is often made with the fingers which usually leads to spillage.

The object of the present invention is to provide such a container, whereby this problem is decreased or avoided.

This object is achieved in that the pull line, which extends between the distal end of the pull-tab and the middle of that part of the edge adjacent to the pull-tab, extends at a distance from the centre of gravity of the opening.

Because the pull line extends in a different direction, the user will tend to grasp the container in a different direction and then pull in a different, non- radial direction. Since the direction of pull now extends as a chord, a possible discontinuity in the pulling forces will result in less chance of spillage since the direction of the force is directed not through but along the centre of the container, so that only a smaller quantity of the substance present in the container, which may or may not be liquid, will be able to overflow to the outside.

According to a first preferred embodiment the pull- tab is formed to cause a tear between the pull-tab and at least a part of the cover.

This means that no separate pouring spout need be arranged; such a container is for instance suitable for viscous substances, such as mayonnaise.

This same advantage also applies in greater measure when the pull-tab is formed to cause a tear extending through the cover.

According to yet another embodiment the cover is connected to the edge of the container with a greater strength at least at two adhesion points than elsewhere, and the connecting line between the adhesion points extends relative to the pull line at an angle varying from a right angle. Tearing loose is hereby facilitated; this measure in any case provides the option making the adhesion between the two adhesion points slightly looser, whereby the pulling force to be exerted by the^" user is more uniform, and the chance of jerking, and thereby of spillage, is again greatly reduced.

In order to bring about a further definition of the tear line, the edge is preferably provided with a continuation extending in the plane of the edge under at least one part of the pull-tab.

Other attractive preferred embodiments are stated in the remaining sub-claims.

The present invention will be elucidated hereinbelow with reference to the accompanying drawings, in which:

Figure 1 is a perspective view of a container according to the invention with a round cover; figure 2 is a top view of the container shown in figure 1; figure 3 shows a top view of a container with a rectangular cover; figure 4 shows a detailed top view of a variant of the container shown in figures 1 and 2; figure 5 is a vertical cross-section of the container shown in figure 4; and figure 6 is a perspective detail view of a further variant of the container shown in figure 4, wherein the foil serving as cover has been omitted.

Figure 1 shows a first embodiment of the invention. This first embodiment comprises a container 1 which is provided on its side with a concertina-like configuration so that it can be compressed. Arranged on the upper side of container 1 is an edge 2 on which a foil layer 3 functioning as cover is arranged by means of a sealing seam, not shown in the drawing, which extends all round. Foil layer 3 is provided with a pull- tab 4. This can be seen more clearly in figure 2 which shows a top view of the container shown in figure 1. A pull line 6 extends from the distal end of pull-tab 4, this end being formed in the present case by a point 5. When pull-tab 4 is pulled, the pull-tab 4 will be pulled loose along pull line 6 and the foil 3 will tear along the tear line 7 shown in broken lines.

In order to prevent directional aberrations in tear line 7, there are arranged between foil 3 and container edge 2 two adhesion points 8, the adhesion of which is greater than that of the connection elsewhere between edge 2 and foil 3. This is however a specific embodiment which is not essential for the invention; it is likewise possible to work with a foil adhered uniformly to the edge along the entire length of the edge.

A spout 9 arranged at the position under pull-tab 4 will be released when the latter is torn loose so that the contents can be poured.

Figure 3 shows a corresponding configuration but in a rectangular form. No pouring spout is arranged here, but the pull-tab extends above the container. It will be apparent that other forms of the upper surface of the container are also possible, such as an oval shape or a hexagonal shape. It is also possible in these cases for the container to be optionally provided with a pouring spout .

Figures 4 and 5 show a particularly attractive embodiment. This embodiment is provided with a channel 10 which extends from the content of the container between cover 3 and container edge 2. The channel has a dead-end in the closed situation of the container. Channel 10 herein fulfils a function comparable to that of pouring spout 9 of the previous embodiment.

The dimensions of channel 10 are chosen such that after a part of cover 3 has been torn loose and the initially blind end of channel 10 is connected to the environment, holding the container 1 with channel 10 downward does not result in the content of container 1 dripping out, and thereby spillage. This is prevented in that the dimensions of channel 10 are chosen such that the capillary and cohesive forces between the content of container 1 and the channel walls is such that this dripping or leakage is prevented.

The content of container 1 is of course a factor here. It is therefore important to choose the dimensions of the channel subject to the nature, and particularly the capillary and cohesive properties, of the substance packaged in the container.

It is of course possible however to urge the content out of container 1, this by exerting force on the container. This is of course possible by compressing the cover 3 generally manufactured from foil, although for this purpose it is more attractive to make use of a container form as described in EP-A-0 880 455. Container 1 hereby becomes compressible, so that the content can be pressed out of container 1 under pressure of the fingers. It is even possible to leave a part of the content in container 1 and only use this later; leakage is after all no longer possible. The advantages of this embodiment become particularly manifest when the container is formed by a container for condensed milk. It is then for instance possible to divide the content of the container between two cups of coffee consumed one after the other.

The area surrounding channel 10 will of course have to be formed such that tear line 7 extends over channel 10 and the length of channel 10 covered by the remaining foil layer 3 has the correct length at the given cross- sectional dimensions to comply with the requirements for generating the correct cohesive and capillary forces. In order to bring about this correct length of channel 10, the cover is fixed to the container edge with a normal adhesion in the vicinity of the channel, i.e. the area 11 in figure 4. In area 12 a firm adhesion takes place, so that it is unlikely that the cover be separated there from the container edge. A tear line 7 is hereby created which extends over channel 10. The location of area 12 with a firm adhesion herein determines the location of tear line 7, and thereby the length of channel 10.

This also prevents the tear line extending into the part of cover 3 above container 1.

The function of area 12 is comparable to that of the adhesion points 8 in the embodiment of figure 2. Another aspect relates to an area 13 with a firm adhesion. The function of this area 13 is to hold the part of the foil which has been torn loose. The forming of an element requiring separate removal in the waste flow is hereby prevented.

It is also possible to arrange a constriction 14 in channel 10. The pressure at which the channel contains or stops the fluid present in the interior of the container can hereby be precisely determined, subject also to properties such as viscosity of the fluid and the adhesion between the materials from which the container is manufactured and the fluid.

The constriction is preferably arranged in the form of an elevation of the recess forming the channel in the vicinity of the connection between the interior of the container and the channel. It is also possible to employ a channel with the longitudinal section of a diabolo. Such an embodiment is shown in figure 6.

In the embodiment shown in figures 4 and 5 the channel is closed on its distal end by a part of the continuation of the edge. The foil herein extends in one plane .

It is also possible to have channel 10 extend to the end of the continuation. In order to obtain a good sealing in a closed container, it is then necessary to recess the foil and to cause adhesion to the material of the continuation in the recess, so that the channel is sealed. Tests have shown that a better flow behaviour of the fluid is then obtained.

Further refinements can of course also be added to this design, such as not adhering the cover and the edge to each other at tab part 5. This makes it easy to grip an edge of the cover.

Claims

1. Container with an opening enclosed by a substantially flat edge, wherein a cover sealing the opening is adhered to the edge, wherein the cover is provided with a pull-tab extending outside the edge, and wherein the cover is manufactured from a flexible, tearable material, characterized in that the pull line, which extends between the distal end of the pull-tab and the middle of that part of the edge adjacent to the pull-tab, extends at a distance from the centre of gravity of the opening.

2. Container as claimed in claim 1, characterized in that the pull-tab is formed to cause a tear between the pull-tab and at least a part of the cover.

3. Container as claimed in claim 1 or 2, characterized in that the pull-tab is formed to cause a tear extending through the cover.

4. Container as claimed in any of the foregoing claims, characterized in that the cover is connected to the edge of the container with a greater strength at least at two adhesion points than elsewhere, and that the connecting line between the adhesion points extends relative to the pull line at an angle varying from a right angle .

5. Container as claimed in any of the foregoing claims, characterized in that the edge is provided with a continuation extending in the plane of the edge under at least one part of the pull-tab.

6. Container as claimed in claim 5, characterized in that the continuation extends to a point below at least a substantial part of the pull-tab, that the continuation is provided with a breaking seam and that the distal end of the continuation is connected to the pull-tab.

7. Container as claimed in any of the foregoing claims, characterized in that the container is provided with gripping surfaces .

8. Container as claimed in claim 6 or 7, characterized in that the continuation under the pull- tab is at least partially recessed.

9. Container as claimed in any of the foregoing claims, characterized in that a notch is made between the pull-tab and the rest of the cover.

10. Container as claimed in any of the claims 6-9, characterized in that a blind channel extending from the content of the container is recessed between the cover and the continuation of the edge, wherein the tear caused when the pull-tab is pulled intersects the channel.

11. Container as claimed in claim 10, characterized in that the dimensions of the channel are so great that when the channel is directed vertically the capillary forces between the channel walls and the content of the container exceed the force of gravity.

12. Container as claimed in claim 10, characterized in that the dimensions of the channel are so great that the capillary forces between the channel walls and the content of the container are smaller than a pressure exerted by the user by means of fingers on the cover of the container.

13. Container as claimed in claim 10, 11 or 12, characterized in that a constriction is arranged in the channel.

14. Container as claimed in claim 10, 11, 12 or 13, characterized in that the channel is at least partly formed by a recess of the continuation of the edge.

15. Container as claimed in claim 14, characterized in that the constriction comprises an elevation of the recess arranged in the vicinity of the inner end of the channel.

16. Container as claimed in any of the claims 10- 15, characterized in that the recess forming the channel is continued up to the end of the continuation and that the channel is sealed by the foil which locally seals the channel and is connected to the recess.

17. Container as claimed in claim 16, characterized in that the channel is widened at its sealed end.

18. Container as claimed in any of the foregoing claims 14-17, characterized in that the extension of the projection of the central axis of the channel onto the upper surface of the container intersects the centre of gravity of the upper surface of the container.