JPH057264B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lid for a can-like container, and in particular to a lid that is attached to the body of a can-like container for storing foodstuffs, etc., and is suitable for use as an auxiliary tool such as a can opener. The present invention relates to a plastic can-like container lid that can be easily opened without using a can.

[Prior Art] The lid of a can-like container is required to be easy to open in order to open the lid and take out the contents inside the container. Conventionally, it has been done using an auxiliary tool such as a can opener to open the package, but this is cumbersome, and most people now open the package without using the auxiliary tool such as a can opener. The use of plastic for the lid of the can-like container is also being promoted, but unlike metal cans, there are various difficulties in realizing this.

The easy-to-open property also includes a so-called pull property that allows the opening to be torn off to the end when opening the lid.

On the other hand, the lid must not be one that will easily break when the can is dropped after filling with contents, and must also have high can-drop strength. .

Furthermore, from a food hygiene perspective, the lid body has so-called tamper resistance, such as poisonous substances mixed into the can with a syringe needle.
They are also required to be rich in resistance (tamper prevention) functions.

Conventionally, in order to open the lid, as shown in FIG. 7, a score of 3 was created by notching a plastic layer 2 on a resin base material 1 containing Al foil or the like with gas barrier properties. Alternatively, as shown in FIG. 8, the surface of the base material 1 is exposed to the outside at the score 3 formed on the plastic layer 2, and as shown in FIG. It is attached by thermal bonding to the body 4 of the plastic layer 2, the tab portion 5 on the plastic layer 2 is lifted, and an opening is opened along the score 3.

Examples of patents describing the plastic can-like containers include JP-A No. 52-39489;
Publications No. 58-125448 and No. 60-23154 are cited.

[Problems to be Solved by the Invention] However, with such a lid, there are some drawbacks in that the easy opening property, especially the ease of tearing to the end, that is, the pulling property is insufficient, and the score is easily damaged during the distribution process. Furthermore, since the score is exposed, the tamper resistance function is insufficient.

In addition, after the lid is fully opened or partially opened along the score, the opening inside the score is removed. If the contents of the can remain inside the can, it is necessary to attach a separate cap for it, or to store it wrapped in a plastic wrap such as film. requires tedious operations.

Furthermore, the conventional lids described above may be weak in strength when the can is dropped laterally or diagonally.

The present invention solves the drawbacks of the conventional example, improves easy openability (including pullability),
To be less likely to be damaged during the distribution process, to improve tamper resistance, to be able to be easily resealed even after being opened, and to improve the strength of these cans from being dropped when dropped horizontally or diagonally. The purpose is to provide technology that enables

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means for Solving the Problems] The present invention provides a lid that is attached to the body of a can-like container, the lid having a gas barrier layer as an inner layer and a thermally bondable synthetic resin layer as both outer layers. A gas barrier multilayer base material having at least a three-layer structure and having a bottom part, a rising part connected to the entire circumference of the upper surface side of the bottom of the lid body, and a flange part connected to all edges of the rising part and protruding outward. and a flange portion, a descending wall portion continuous to the entire inner periphery of the flange portion, a bottom portion connected to the lower peripheral edge of the descending wall portion and protruding inward to an appropriate width, and a peripheral edge of the bottom portion. An outer periphery made of synthetic resin having a protrusion projecting upward on the whole or part of the edge, a main body located within the outer periphery, and a peripheral end of the main body excluding the protruding tip. an inner peripheral part made of synthetic resin having a hook part formed over the whole or in parts; and an inner peripheral part made of synthetic resin, which is attached to the upper surface of the main body of the inner peripheral part, and when the lid is opened, the thrusting tip part can be opened. a tab portion that enables the lid to be opened; and the inner surface of the flange, and the lower surface of the main body of the inner peripheral portion and the upper surface of the bottom of the gas barrier multilayer base material are thermally joined at least at the outer peripheral edge of the inner peripheral portion. The can-like container lid is characterized in that the peripheral part and the outer peripheral part are not thermally bonded, and the hook part of the inner peripheral part is engaged with the projection part of the outer peripheral part.

[Operation] The operation of the main configurations (means) that characterize the present invention will be outlined below.

In the present invention, a bottom portion is provided to protrude into the cover body by an appropriate width and is connected to the lower peripheral edge of the descending wall portion of the outer peripheral portion made of synthetic resin. This width is made small so that the main body of the inner peripheral part made of synthetic resin, which will be described later, can be placed inside the protrusion of the outer peripheral part, which will be described below. In addition, as will be described later, the width is such that the hook portion of the inner circumferential portion can fit therein.

A protrusion that protrudes upward (erects) is provided on the peripheral edge of the bottom of the outer circumference.

Therefore, a groove defined by the protrusion on the outer periphery, the upper surface of the bottom, and the inner surface of the descending wall is formed on the outer periphery.

Note that a flange portion is provided at the upper portion of the descending wall portion of the outer peripheral portion.

The present invention provides a flange portion, a descending wall portion continuous to the entire inner periphery of the flange portion, a bottom portion connected to the lower peripheral edge of the descending wall portion and protruding inward to an appropriate width, and a periphery of the bottom portion. Insert the tip of the hook part of the synthetic resin inner periphery into the above-mentioned groove of the synthetic resin outer periphery, which has a protrusion that protrudes (erects) upward on the whole or a part of the edge. Make it fit.

That is, the inner peripheral part has a main body having a size that fills the entire inside of the protrusion of the outer peripheral part, and a hook part formed at the peripheral end of the main body.

The hook has a tip that can fit into the groove.

This hook portion is formed at the circumferential end of the main body except for the protruding tip.

When constructing the lid, inside the protrusion on the outer periphery,
Position the peripheral edge of the main body on the inner periphery.

Then, as described above, the tip of the hook portion on the inner circumferential portion is fitted into the groove defined by the protrusion on the outer circumferential portion, the slightly protruding upper surface of the bottom portion, and the inner surface of the descending wall portion.

The lower surface of the protrusion on the outer periphery, the lower surface of the bottom, the outer surface of the descending wall, the outer surface of the flange, and the lower surface of the main body on the inner periphery are covered with at least three layers having a gas barrier layer as an inner layer and a synthetic resin layer that can be thermally bonded to both outer layers. The material is thermally bonded to a gas barrier multilayer base material having a layered structure and having a bottom portion, a rising portion continuous to the entire circumference of the upper surface side of the bottom portion, and a flange portion connected to all edges of the rising portion and protruding outward. .

Specifically, the lower surface of the protrusion on the outer periphery, the lower surface of the bottom, and the lower surface of the main body on the inner periphery are on the upper surface of the bottom of the base material, the outer surface of the descending wall on the outer periphery is on the inner surface of the rising part of the base material, Further, the outer surface of the flange portion of the outer peripheral portion is thermally bonded to the inner surface of the flange portion of the base material.

However, in the present invention, the hook portion is only fitted into the groove, and the protruding tip portion of the inner circumferential portion is only in contact with the projection portion of the outer circumferential portion.

When you lift up the tab attached to the top of the body on the inner periphery, the tip of the inner periphery only touches the protrusion on the outer periphery as described above, but is not welded (fixed) by heat. Therefore, the tip of the thrusting tip makes it easy to tear the gas barrier multilayer base material underneath, and after tearing, pull the tab toward the hand, as described above. Since the hook portion is only fitted into the groove and is not fixed by heat, the lid can be opened easily and its pullability is good, resulting in extremely good final easy-opening performance.

The hook part on the inner periphery is fitted into the groove on the outer periphery, and these boundaries are covered by the hook part, and the protruding tip of the inner periphery has a gap corresponding to the conventional score with the protrusion on the outer periphery. Since it is in contact without providing a tamper resistance, it prevents the score from being damaged or tampered with, unlike the conventional lid body with a score, which is advantageous in the logistics process. Functionality can also be improved.

In addition, the separated inner peripheral part (including the gas barrier multilayer base material thermally bonded to the bottom surface of the main body) can be simply sealed once again by fitting the hook part into the groove of the outer peripheral part again. This eliminates the need for conventional storage methods such as attaching a separately manufactured overcap or wrapping the product in a wrapper to cover an opened opening that cannot be closed again. All you have to do is put the lid back on at the inner periphery and store it in a refrigerator.

Furthermore, since the hook portion on the inner circumference is fitted into the groove on the outer circumference and is made immovable, it is possible to improve the strength of the can against dropping in a lateral direction or an oblique direction. Conventionally, with a lid body provided with a score, when the can is filled with contents and dropped, stress tends to concentrate on the score, causing the can to break. Not providing anything equivalent to the score is also a factor in improving the drop strength.

[Example] Next, an example of the present invention will be described based on the drawings.

FIG. 3A shows a plan view of the inner circumference, and FIG. 3B shows a plan view of the outer circumference.

A hook portion 9 is formed at the peripheral end portion of the inner peripheral portion 6 excluding the protruding tip portion 8 of the main body 7 .

The outer peripheral part 10 includes a flange part 11, a descending wall part 12 connected to the entire inner peripheral part of the flange part 11, and a bottom part 13 connected to the lower peripheral edge of the descending wall part 12 and protruding slightly inward. and a protrusion 14 erected upward on the entire circumferential edge of the bottom portion 13.

In FIG. 3A, the tab portion is omitted on the upper surface of the main body 7 of the inner peripheral portion 6.

The upper part of FIG. 2 shows a perspective view cut along the line of FIG.

The lower part of FIG. 2 shows a perspective view of the outer peripheral portion 10 fixed on the gas barrier multilayer base material 1 taken along the line B-- in FIG. 3.

As shown in FIGS. 1 and 2, the tip portion 90 of the hook portion 9 of the inner peripheral portion 6 is defined by the protrusion 14 of the outer peripheral portion 10, the upper surface of the bottom portion 13, and the inner surface of the descending wall portion 12. It fits into the groove.

The side surface of the protruding tip 8 of the inner circumference 6 abuts against the protrusion 14 of the outer circumference 10 .

The lid body has the entire lower surface of the main body 7 of the inner circumference 6, the lower surface of the protrusion 14 of the outer circumference 10, and the lower surface of the bottom 13 adhered (fixed) to the upper surface of the bottom 1A of the gas barrier base material 1. The outer surface of the descending wall part 12 of the outer peripheral part 10 is fixed to the inner surface of the rising part 1B of the gas barrier multilayer base material 1, and the inner surface of the flange part 1C of the gas barrier multilayer base material 1 and the flange part 11 of the outer peripheral part 10 are fixed. The outer surface is fixed. In this embodiment, an example is shown in which the entire inner surface of the flange portion 1C of the base material 1 and the entire outer surface of the flange portion 11 of the outer peripheral portion 10 are fixed, but the end of the flange portion 11 of the outer peripheral portion 10 , and a portion protruding in the direction of the descending wall 12 of the outer circumferential portion 11 is provided, and the outer surface of the flange portion 11 of the outer circumferential portion 10 and the collar portion 1 of the gas barrier multilayer base material 1 are provided.
C may be partially fixed.

In the lid of the present invention, the side surface of the thrusting tip 8 of the inner peripheral part 6 is simply brought into contact with the protrusion 14 of the outer peripheral part 10, and is not fixed as described above.

FIG. 4 shows an enlarged sectional view of the main part.

The side surface of the thrusting tip 8 of the inner circumference 6 and the outer circumference 1
The contact portion 15 with the side surface (outer surface) of the protrusion 14 of No. 0 is left in contact only.

FIG. 5 shows another embodiment of the present invention, and in the embodiments shown in FIG. , an example has been shown in which the groove 16 at the portion of the inner peripheral portion 6 that the thrusting tip 8 abuts is exposed to the outside, but in the embodiment shown in FIG. A groove cover part 80 is provided to protrude parallel to the upper surface of the tab part 5 to cover the groove 16 and prevent it from being exposed to the outside. Thereby, the tamper resistance function can be further improved. In such a case, since the bottom portion 13 of the outer peripheral portion 10 is configured to have a small width, the easy opening property is not hindered much.

FIG. 6 also shows another embodiment of the present invention, and in the embodiment shown in FIG.
Although the example in which the hook portion 9 is provided over the entire circumferential edge of the main body 7 except for the thrusting tip portion 8 is shown, as shown in the plan view of the inner circumferential portion in FIG. It may also be formed partially, such as by dividing it into two parts.

Gas barrier multilayer base material 1 used in the present invention
has a gas barrier layer as an inner layer and a thermally bondable synthetic resin layer as both outer layers. A specific example is a three-layer structure having a gas barrier layer as an intermediate layer and heat-bondable synthetic resin layers on both surface layers.

The gas barrier layer needs to be impermeable to oxygen, water, and other substances that would spoil the contents of the can.

Examples of materials constituting the gas barrier layer include metal foil, plastic film, and plastic sheet. An example of metal foil is Al foil.

Examples of the above-mentioned films and sheets include films and sheets made of saponified ethylene-vinyl acetate copolymers, polyvinyldene chloride, polyamide, polyacrylonitrile, and the like.

As the material constituting the gas barrier layer used in the present invention, it is preferable to use metal foil, particularly aluminum foil, from the viewpoints of the desired purpose of the present invention and economical efficiency. Among the resin layers constituting the gas barrier multilayer base material 1, one resin layer has an inner peripheral portion 6.
and the outer circumference 10, and the other resin layer is fixed to the body 4 (FIG. 9) of the can-like container.

The resin used in the synthetic resin layer is one that can be heat-sealed for the above-mentioned purpose, for example, a thermoplastic synthetic resin that melts when heated.

In particular, it is preferable to use polypropylene resin (PP), which may be of the homo-type or copolymer type, but it is preferable to use block PP.

In the present invention, the thickness of the synthetic resin layer constituting the gas barrier multilayer base material must be 100 μm or less on one side, in relation to ease of opening and can strength when used as a product, and the gas barrier layer such as aluminum foil must be used. The layer thickness is
It is desirable that the thickness be 50μ or less, preferably 9 to 30μ.

The lid of the present invention includes, for example, installing a gas barrier multilayer base material 1 in a mold of an injection molding device, and
On this, a synthetic resin is injected and an outer peripheral part 10 is laminated on the base material 1, as shown in the lower part of FIG. It can be obtained by attaching the tab portion 5 to the laminate by high frequency welding, and attaching this to the above-mentioned laminate by high frequency welding, but it can also be obtained by various other manufacturing methods.

As the synthetic resin constituting the outer circumferential portion 10 and the inner circumferential portion 6, the same synthetic resin as the synthetic resin constituting the gas barrier multilayer base material 1 can be used.

Various additives such as pigments, inorganic fillers, and lubricants can be added to these synthetic resins as necessary.

According to the present invention, when the tab portion 5 attached to the upper surface of the main body 7 of the inner circumferential portion 6 is lifted, the thrusting tip portion 8 of the inner circumferential portion 6 is only in contact with the projection portion 14 of the outer circumferential portion 10. Since it is not fixed, the thrusting tip 8 facilitates tearing the gas barrier multilayer base material 1 underneath, and after tearing, when the tab portion 5 is pulled toward the hand side, the hook portion 9 is released. Since the lid is only fitted in the groove 16 and is not fixed in the same way, the lid can be opened easily and has good pullability, resulting in extremely good final easy-opening performance.

Further, according to the present invention, the hook portion 9 of the inner peripheral portion 6
is fitted into the groove 16 of the outer circumferential part 10, and these boundaries are covered with the hook part 9, and the protruding tip part 8 of the inner circumferential part 6 corresponds to the protrusion part 14 of the outer circumferential part 10 in the conventional score. Since they are in contact with each other without any gaps, unlike conventional lids with scores, it is possible to prevent the scores from being damaged or tampered with, which is advantageous in the logistics process, and also prevents tampering. Resistance function can also be improved. As shown in FIG. 5, by providing a groove covering portion 80 to cover the groove 16, the tamper resistance function can be further improved.

Furthermore, according to the present invention, the removed inner circumferential part 6 (including the gas barrier multilayer base material 1 thermally bonded to the lower surface of the main body) is attached to the hook part 9 by the opening.
By fitting the book into the groove 16 of the outer periphery 10 again, the book can be opened and then sealed again, eliminating the need for a separate overcap or wrapping it in a plastic wrap as in the past. In the present invention, as described above, it is sufficient to cover the inner peripheral part 6 again and store it in a refrigerator or the like.

Further, according to the present invention, the hook portion 9 of the inner peripheral portion 6
Since the can is fitted into the groove 16 of the outer circumferential portion 10 and does not move, it is possible to improve the strength against dropping the can when it is dropped horizontally or diagonally. Furthermore, with conventional lids provided with scores, when the can is filled with contents and dropped, stress tends to concentrate on the scores, causing the can to break. Not providing anything equivalent to the conventional score is also a factor in improving the drop strength.

Although the invention made by the present inventor has been specifically explained based on the examples above, the present invention is not limited to the above examples, and it is understood that various changes can be made without departing from the gist of the invention. Needless to say.

For example, the protrusions on the outer periphery may not be provided on the entire periphery, but only on the portions corresponding to the hooks on the inner periphery.

Alternatively, the lower surface of the main body at the inner peripheral portion and the upper surface of the bottom portion of the gas barrier multilayer base material may not be thermally bonded to the entirety, but at least only the outer peripheral edge of the inner peripheral portion may be thermally bonded.

The present invention can be applied to can-like containers of various shapes, such as round cans, square cans, and oval cans.

[Effects of the Invention] The effects obtained by the typical inventions disclosed in this application are briefly explained below.

According to the present invention, it is possible to improve the ease of opening, prevent damage during the distribution process, improve the tamper resistance function, make it possible to easily reseal the can after opening, and further improve the strength against dropping cans. We were able to provide the necessary technology.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional perspective view showing an embodiment of the present invention, FIG. 2 is an assembled configuration diagram showing an embodiment of the present invention,
FIG. 3A is a plan view of the inner circumferential portion showing an embodiment of the present invention, FIG. 3B is a plan view of the outer circumferential portion showing an embodiment of the present invention, and FIGS. FIG. 6 is a plan view of an inner peripheral portion showing another embodiment of the present invention, and FIGS. 7 to 9 are sectional views of conventional examples. DESCRIPTION OF SYMBOLS 1...Gas barrier multilayer base material, 4...Can-like container body, 5...Tab portion, 6...Inner peripheral portion, 7...Main body, 8...Pushing tip portion, 9...Hook portion, 1
0...Outer circumferential part, 11...Flange part, 12...Descent wall part, 13...Bottom part, 14...Protrusion part, 16...
…groove.

Claims (1)

[Claims] 1. A lid attached to the body of a can-like container, the lid having at least a three-layer structure having a gas barrier layer as an inner layer and heat-bondable synthetic resin layers as both outer layers. a gas barrier multilayer base material comprising a bottom part, a rising part connected to the entire circumference of the upper surface side of the bottom part, and a flange part connected to the entire edge of the rising part and protruding outward; A descending wall part connected to the entire inner circumference of the flange part, a bottom part connected to the lower circumferential edge of the descending wall part and protruding inward to an appropriate width, and a part of the circumferential edge of the bottom part. An outer periphery made of synthetic resin having a protrusion projecting upward, a main body located within the outer periphery, and a peripheral end of the main body excluding the protruding tip, which is formed over the entirety or divided into parts. an inner peripheral part made of synthetic resin and having a hook part; a tab attached to the upper surface of the main body of the inner peripheral part, and which allows the thrusting tip to open the lid by lifting it when opening the lid; and the lower surface of the protrusion of the outer circumferential portion, the lower surface of the bottom, the outer surface of the descending wall portion, and the outer surface of the flange portion, and the inner surfaces of the bottom portion, rising portion, and flange portion of the gas barrier multilayer base material. At the same time, the lower surface of the main body of the inner peripheral part and the upper surface of the bottom of the gas barrier multilayer base material are thermally joined at least at the outer peripheral edge of the inner peripheral part, but the inner peripheral part and the outer peripheral part are A can-like container lid characterized in that the hook part on the inner circumferential part is engaged with the protrusion part on the outer circumferential part without being thermally bonded.