JPH0144584B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Purpose of the Invention [Field of Industrial Application] This invention relates to container lids, and in particular to easy-to-open lids that are sealed by heat sealing or other means to molded containers for storing foods and other items. This relates to container lids.

[Prior Art] In recent years, cup containers and tray containers using at least a portion of plastic materials have been used as containers for sealed storage of foods and other articles. Such containers are widely used because they are lightweight, have the same shelf life as cans and bottles, are low cost, meet the requirements for resource conservation, and are easy to handle.

One of the most important requirements for ease of handling is ease of opening. There is a great demand for container lids that can be easily opened using only hands and fingers without the need for any other tools.

It was developed in the Showa era as a type of container lid with easy opening.
There is one shown in Utility Model Registration Application No. 153622 of 1959. This is a "lid that can form a tear opening, has an outer edge contour capable of covering the container opening to be closed, and has cutout parts and non-cutout parts arranged alternately along the contour of the tear opening." or a base material piece provided with a notch to serve as the tear opening, and an outer adhesive piece having approximately the same outer edge contour as the base material piece and releasably attached to the surface of the base material piece;
an inner adhesive piece having approximately the same outer edge contour as the base material piece and attached to the back surface of the base material piece; the outer adhesive piece and the inner adhesive piece pass through the notch of the base material piece; FIG. 6 shows a lid 101 according to an embodiment of the "Easy-openable lid material characterized by an adhesive material." The lid 101 has an outer edge 104 heat-sealed to a flange 103 at the open end of the container 102 to seal the container 102.
When opening, when the outer adhesive piece 106 of the lid 101 is pulled in the opening direction 108, the outer adhesive piece 106 is attached to the base material piece 1.
Since it is peelably bonded to 05, base material piece 10
The inner patch 107 is peeled off from the outer edge A to the inner edge B of 5 and is then attached to the outer patch 106.
06, the inner patch 107 is torn at B. This cutting is performed along the inner edge of the base material piece 105 (peripheral edge of the notch 110) to form an opening.

The lid 101 configured in this manner is excellent in that an opening of any size and shape can be formed at any position on the lid of a cup or tray container without requiring any other tools. . However, if the lid and container are sufficiently heat-sealed during filling and sealing, heat and pressure are applied by the heat bar, and depending on conditions such as the material of the container and lid, and the heat-sealing temperature and pressure, There is a problem in that the adhesive strength when bonding the outer adhesive piece and the base material piece, which was previously peelable, is increased, making it difficult to peel off, and the outer material may be damaged by heat. was desired.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned circumstances, and solves the above-mentioned problems of the prior art. , it is possible to form an opening of any size and shape, no other tools are required for the opening operation, and the ease of opening is not affected by heat sealing between the container and the lid. The purpose is to provide container lids.

(b) Structure of the invention [Means for solving the problem] Corresponding to this purpose, the container lid of the present invention has the following features:
A container lid that can be torn to form an outlet for taking out the contents of the container and that can be stuck to the container to close the opening of the container, the container lid comprising:
an inner layer material that can be attached to the container to close the container opening; and an inner layer material that has a smaller outline than the outline of the outlet and that is attached to the inner layer material inside the imaginary outline of the outlet. an intermediate layer material having a contour larger than the contour of the outlet, the intermediate layer material being attached to the inner layer material in a state covering the intermediate layer material, and detachably attached to the intermediate layer material. The outer layer material has a tear weakened portion with an open curve that defines a portion of the outer layer material as a grip portion, and the open curve is located inside the outline of the middle layer material as the grip portion. consists of two continuous arcs at the tip of the knob, one of which extends from the tip of the knob to a point where it intersects with the contour of the intermediate layer material, and then goes around the contour of the content outlet, and the other arc is It is characterized by being located closer to the center of the container lid than one of the arcs.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

In FIG. 1, FIG. 2, and FIG. 4, 1 is a container lid. The container lid 1 has its peripheral edge attached to the flange 3 of the container 2, and is attached to the opening 5 of the container 2.
The arc CDEF⌒ is located slightly inside along the inner contour line 9 of this adhesive part 4.
It is possible to form an outlet for extracting contents using the contour line 10 represented by as a virtual contour.

The container lid 1 consists of an inner layer material 6, an intermediate layer material 7, and an outer layer material 8.

The inner layer material 6 is attached to the container 2 and the opening 5 thereof is
It has an outer edge contour that can occlude the area. As the inner layer material 6, for example, a polypropylene film with a thickness of 70 μm can be used.

The intermediate layer material 7 has a contour line 12 having a smaller outline than the contour line 10, and is attached to the inner layer material 6 inside the contour line 10. Contour line 10 and contour line 12
The distance increases from point C to point D. This is important. As an intermediate layer material,
For example, the inside layer is 30μ thick polypropylene, on top of that 12μ thick polyester, and the top layer is 30μ thick polypropylene.
It is possible to use a relatively hard laminated film made by laminating 20μ thick polyethylene, or laminating 50μ thick polypropylene, 7μ thick aluminum foil, and 20μ thick polyethylene in this order.

The outer layer material 8 has the same outer edge contour as the inner layer material 6 and therefore a larger contour than the contour line 9 and has the same outer edge contour as the inner layer material 6
It is attached to the inner layer material 6 in a state that covers it, and is also attached to the intermediate layer material 7 so that it can be peeled off. As such an outer layer material 8, corresponding to the materials of the inner layer material 6 and intermediate layer material 7 described above, for example, a polypropylene film with a thickness of 70μ, an aluminum foil with a thickness of 7μ and a polyester with a thickness of 12μ are laminated in this order from the inner side. A laminated film can be used.

The outer layer material 8 has a slit 11 formed therein, which acts as a cutaway weakened portion. Instead of the slits 11, perforations, scores, etc. may be used. The slit 11 is formed from a starting point A located inside the contour line 12 of the intermediate layer material 7, through an intersection B where it intersects the contour line 12, to a portion that coincides with the imaginary contour line 10 of the outlet, that is, an arc CDEF⌒. The outer slit 11a ends at the point F, and the outer slit 1 starts at the starting point A.
1a and located along and inside the outer slit 11a, with the band-shaped portion 13 sandwiched between the outer slit 11a and the point H near the point A.
and an inner slit 11b ending at . The slit 11 is an open curve that does not intersect with itself, so the outer layer material does not separate from the adhesive part 4, which is the peripheral edge, and is separated from the adhesive part 4 at two points C and F.
They are connected at a portion 14 in between.

[Function] From a container 2 sealed with such a container lid 1,
For the opening operation when taking out the contents, first peel off the point A of the outer layer material 8 in FIG.
3a will peel off from the intermediate layer material 7, so if you pinch this tip 13a and pull it in the opening direction 15, the outer layer material 8 will peel off.
The arc above the slit 11 in the band-shaped portion 13 of
The portions corresponding to AB⌒ and AG⌒ peel off from the intermediate layer material 7. When this peeled tip 13a is further pulled in the opening direction 15, the intermediate layer material 7 is removed from the portion of the strip portion 13 corresponding to the arc BC⌒ above the slit 11.
The attached portion 13b peels off from the intermediate layer material 7,
Following this, the portion 13c of the band-shaped portion 13 near the arc BC⌒ and attached to the inner layer material 6, that is, the portion 13c sandwiched between the arc BC⌒ and the arc BS⌒, rises.

When the portion 13c rises, the portion 6c of the inner layer material 6 that is attached to the portion 13c rises (the third
figure). However, the inner layer material 6 is stuck to the intermediate layer material 7 inside the arc BS⌒, and even if the portion 6c rises, it is blocked by the intermediate layer material 7 and does not rise, so the inner layer material 6 Cut along BS⌒.

Furthermore, the inner layer material 6 is attached to the outer layer material 8 at the outer portion 6b of the arc BC⌒ (FIG. 3). Since this portion of the inner layer material 8d is cut from the portion 13c by the slit 11, it does not rise even if the portion 13c rises. Therefore, due to the rise of the portion 13c, the inner layer material 6
is cut along the arc BC⌒.

Therefore, due to the tension, the inner layer material 6
Only c is torn off while it is stuck to the back side of the portion 13c of the outer layer material, and as a result, the opening of the outlet of the container 3 starts from point B.

In this way, the opening of the outlet is placed in the inner layer material 6 at point B.
This is done by causing a cut along two lines BC (contour line 10) and BS (contour line 12) starting from , and this is the result of the fracture stress being concentrated at one point B. However, the subsequent cutting of the inner layer material 6 continues only in the direction along the contour line 10, as described below.

The opening direction 15 is in this case the tangential direction of the imaginary contour line 10 of the outlet, which is the direction of the force.

The contour line 12 has a smaller contour than the contour line 10, is inside the contour line 10, and has a smaller contour than the contour line 10 as described above.
0 increases from point C to point D on the contour line 10, the direction in which the inner layer material 6 is cut at a certain point R on this interval arc CD⌒ and the contour line 12 opposite thereto Unlike the direction in which the inner layer material 6 is cut at point T above, the cutting at point R matches the direction of the force, whereas the cutting at point T does not match the direction of the force, so the stress applied to point T is no longer able to continue cutting along the contour line 12, and the cutting of the inner layer material 6 stops at point T or after an irregular cut following point T. After this, the tensile force is concentrated only on the side of the contour line 10 and continues its cutting. It is also possible to remove the container lid 1 from the container 2 by tearing between the CFs after cutting to point F, or if you do not want to separate the container lid 1 from the container 2, cut the container just before point F. By stopping at point E, it is possible to achieve sufficient non-separability.

In either case, the opening operation is extremely easy, and the ease of opening is not affected by heat sealing between the container and the container lid.

[Other Embodiments] In FIG. 5, 1a is a container lid according to another embodiment of the present invention. The ratio of the area of the intermediate layer material 7a to the container lid 1a is very small compared to that of the container lid 1, which is advantageous in that less material is required;
After intersecting with the outer slit 11a at intersection B,
The structure of increasing the distance between the outer slit 11a and the contour line 10 is the same as the container lid 1, and when opening, peel it off from point A and pull it in the opening direction 15a, and it will open from point B, cutting the inner layer material. The cutting is carried out from point B along the contour 10 and the contour 12a, but along the contour 12a, an action that stops at a certain point T or after an irregular cut following the point T is also performed on the container. It is no different from lid body 1.

(c) Effects of the invention As is clear from the above explanation, according to the present invention, it is possible to form an opening of any size and shape at any position on the lid of a cup or tray container. Therefore, it is possible to obtain a container lid that does not require any other tools for its opening operation and whose ease of opening is not affected by heat sealing between the container and the lid.

[Brief explanation of drawings]

FIG. 1 is a plan view of a container lid according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view showing the container lid shown in FIG. 1 heat-sealed to a container, and FIG. Figure 4 is an exploded view of the container lid shown in Figure 1.
FIG. 5 is a plan view showing a container lid according to another embodiment of the present invention, and FIG. 6 is an explanatory longitudinal sectional view showing a conventional container lid. be. DESCRIPTION OF SYMBOLS 1... Container lid, 2... Container, 3... Flange part, 4... Adhesive part, 5... Opening part, 6... Inner layer material, 7... Intermediate layer material, 8... Outer layer material, 9...Inner contour line, 10...Outline line, 11...Slit, 12
...contour line, 13...band-shaped part, 14...CF
The part between 15...the opening direction.

Claims (1)

[Claims] 1. A container lid that can be torn to form an outlet for taking out the contents of the container and that can be attached to the container to close the opening of the container, the container lid that can be affixed to the container to close the opening of the container. an inner layer material capable of closing the opening of the container; and an intermediate layer material having a smaller contour than the contour of the outlet and attached to the inner layer material inside the imaginary contour of the outlet. , the outer layer material has a larger outline than the outline of the outlet, is attached to the inner layer material in a state covering the intermediate layer material, and is attached releasably to the intermediate layer material; has a tearing weak part with an open curve that defines a part of the outer layer material as a tab, and the open curve includes two continuous tear points at the tip of the tab located inside the contour of the middle layer material. One of the arcs extends from the tip of the knob portion to a point where it intersects with the outline of the intermediate layer material, and then goes around the outline of the content outlet, and the other arc is closer to the container than the one arc. A container lid body characterized by being located near the center of the lid body.