JP4962835B2 - Opening structure for containers - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an opening structure that constitutes an opening portion such as a drinking mouth, a discharge opening, and a pouring opening in various containers, and particularly relates to an opening structure for a container that is closed by an easy peel sealing means.

  In recent years, paper containers such as paper cans have been developed and put into practical use from the viewpoint of environmental protection as substitutes for metal cans and plastic containers containing liquids such as soft drinks.

  As shown in FIG. 1, the conventional metal can substitute paper container has a container body made of a paper laminate material, closed at both ends by a trunk portion 100 and a bottom material 101, and the other opening is a lid. What is obstructed by the material 102 is known. The lid 102 is provided with a drinking hole 103, and the drinking hole 103 is previously closed by an easy peel sealing material 104.

  In general, in the conventional metal can substitute paper container, an aluminum foil is used as a barrier material, and it is synthesized with an easy peel sealing material 104 that closes the drinking hole 103 previously formed in the lid material 102. An aluminum sheet laminated with a resin is used.

  However, in the conventional structure for opening the mouth of a paper container, when the easy-peeling sealing material that is closed is peeled and removed, the paper material at the edge of the periphery of the opening is partially removed along with the peeling of the sealing material. There is a problem of paper peeling. Such abnormal peeling accompanied by paper peeling is not only a problem that the appearance of the container is impaired, but also when the paper container is continuously used after opening, the content penetrates from the paper peeling portion and is caused by swelling around the opening. Deformation problems arise.

  In order to prevent such abnormal peeling, it is effective to preliminarily cover and protect the periphery of the opening with a resin film layer such as polyethylene, but such a covering protection step brings about complication of the manufacturing process, It is also disadvantageous in terms of manufacturing costs.

  The present invention has been made in view of the above-described points, and prevents easy peeling and deformation of the opening accompanying this, and is also an easy peel for containers that is advantageous both in the simplification of the manufacturing process and in cost reduction. It is an object to provide a conductive opening structure.

  In order to solve the above-described problems, the container opening structure according to the present invention closes the opening for discharging and / or injecting the contents provided in a predetermined portion of the container body by an easy peel sealing means. An opening structure for a container, comprising a three-piece structure of a container main body having an opening, an inner surface film and a pull tab, and the inner surface film covering the opening end surface from the inner side of the container. And a non-adhesive portion having a predetermined width from the end surface of the opening edge on the periphery of at least the outer surface of the opening, and the inner surface sandwiching the opening. The film, the periphery of the opening, and the pull tab are joined together.

  As described above, in the opening structure according to the present invention, the non-adhesive portion having a predetermined width from the opening edge end surface is provided at the periphery of at least the outer surface of the opening. It is possible to effectively prevent the portion or the end face from being destroyed with the peeling of the pull tab. Therefore, it is possible to effectively protect the end face of the container opening and prevent abnormal peeling by means that are simple in terms of structure and manufacturing process.

  Moreover, since the opening structure by this invention consists of said structure, an inner surface film is destroyed and removed rapidly and cleanly along a junction part with a pull tab simultaneously with peeling of a pull tab.

  In a preferred aspect of the present invention, the pull tab joint at the periphery of the opening may be constituted by a member having an opening that is entirely or partially coated with polyethyleneimine as an adhesion assistant and easy peel material.

  In the present invention, the non-adhesive portion can be provided on the inner peripheral surface of the opening so as to have a predetermined width from the end surface of the opening edge.

  In the present invention, the pull tab can be composed of a laminated film including at least a barrier layer and a synthetic resin layer, and the inner film can be a single-layer synthetic resin layer, a multilayer synthetic resin layer, or a synthetic resin layer and a barrier layer. It can comprise by the laminated film containing.

  In one aspect of the present invention, the inner film can be configured to remain exposed with a predetermined width at the periphery of the opening after the inner film is broken and removed.

  The opening structure according to the present invention is a chemical solution such as a shampoo, a rinse, and various detergents in addition to openings in various forms such as a container in the form of a bevel, a container in a block form, a container in a cylindrical form, and an opening in a paper container for beverage liquid. It can be applied to a wide range of uses such as an opening for a container, a container for powder, and an opening for hot water cutting of food containers such as noodles.

  One embodiment of the opening structure according to the present invention is shown in the cross-sectional view of FIG.

  In the opening structure shown in FIG. 2, an opening 2 provided in a paper container main body 1 (for example, a cover paper) is closed by an inner film 3 that covers from the inside of the container and a pull tab 4 that covers from the outside of the container. .

  Further, in the opening structure of the present invention, in the structure in which the inner film 3 and the pull tab 4 are joined, the container surface and the pull tab 4 are joined at the adhesive interface 5a, and the inner film at the adhesive interface 5b. 3 and the inner surface of the container are joined together, and the inner film 3 and the pull tab 4 are joined at the portion of the adhesive interface 5c. Therefore, in the opening structure of the present invention, a non-adhesive portion having a predetermined width from the opening edge end face is provided on the periphery of the opening 2, and the inner surface film, the opening periphery, and the pull tab are sandwiched between the openings. Are joined to each other to seal the opening. In the opening structure shown in FIG. 2, an example in which non-adhesive portions are provided on both the outer surface and the inner surface of the periphery of the opening portion is shown, but in the present invention, the non-adhesive portion on the inner surface is It is not always necessary to provide it.

  Moreover, in the adhesion interface 5a, it joins by the easily peelable adhesive means so that the easy peel property of the pull tab 4 may be ensured. Such easy adhesion means will be described later.

  As a material constituting the container body 1, a conventionally known material, for example, a laminate including a paper layer, a synthetic resin layer, and a barrier layer can be used. For example, as shown in FIG. 2, a polyethylene layer 10a, an aluminum layer, etc. A laminate of the barrier layer 11, the polyethylene layer 10b, the paper layer 12, and the polyethylene layer 10c may be used.

  Although the inner surface film 3 can be normally comprised by the laminated film containing a synthetic resin layer and a barrier layer, specifically, it can be a laminated body of the polyethylene layer 20a, the barrier layer 21, and the polyethylene layer 20b. In this case, it is preferable that the polyethylene layers 20a and 20b have a thickness of 10 to 50 μm and the barrier layer 21 has a thickness of 2 to 20 μm in order to facilitate simultaneous destruction and removal with the pull tab.

  The pull tab 4 can usually be composed of a laminated film including a barrier layer made of aluminum foil and a synthetic resin layer. For example, as shown in the drawing, the pull tab 4 is preferably a laminated body of a polyethylene layer 30 and a barrier layer 31. Further, the pull tab in the present invention is not shown, but a laminate comprising paper layer / polyethylene layer / barrier layer / PET layer / polyethylene layer, or paper layer / polyethylene layer / PET layer (for example, silica-deposited PET) / polyethylene layer. It can also comprise by the laminated body which consists of.

  Next, with reference to FIG. 3 and FIG. 4, the formation method of the opening structure of this invention including the closing method of an opening part is demonstrated.

  In one embodiment shown in the process cross-sectional views of FIGS. 3A and 3B, when forming the opening structure of the present invention, the opening of the container body 1 and the inner film between the seal head 41 and the seal receiver 40 are used. 3 is aligned and arranged, and a predetermined portion of the seal head 41 is pressed under heating to weld the predetermined portion of the inner surface film 3 to the periphery of the opening. Here, the portion indicated by A is a welded portion.

  Next, as shown in FIG. 3 (b), the inner film 3 and the pull tab 4 welded to the periphery of the opening of the container body 1 are now aligned between the seal head 51 and the seal receiver 50 having different shapes. The pull tab 4 is adhered by pressing the predetermined portion of the seal head 51 under heating. The part indicated by A in FIG. 3B is an adhesive part where adhesion is performed in this step, and the part indicated by B is an easy peel adhesive part.

  A preferable condition for performing easy-peel bonding is that the outer surface of the container body 1 is coated with polyethyleneimine on the entire surface or on the pull tab joint at the periphery of the opening.

  FIG. 4 is a process cross-sectional view showing a forming method according to another embodiment. First, in step (a) of FIG. 4, the opening of the container body 1 and the inner film 3 between the seal head 61 and the seal receiver 60. Then, the pull tab 4 is aligned and disposed, and a predetermined portion of the seal head 61 is pressed under heating to bond the inner film 3 and the predetermined portion of the pull tab 4 together. Here, the portion indicated by A is a welded portion.

  Next, in the step shown in FIG. 4B, the seal head 71 having a different shape is used for pressure bonding as illustrated. In the figure, a portion indicated by A is an adhesive portion where bonding is performed in this step, and a portion indicated by B is an easy peel adhesive portion. The easy peel adhesion conditions in this case are the same as in FIG.

  Although the opening structure of the present invention can be formed by the method as described above, the present invention is not limited to the above embodiment. Further, the planar shape of the opening structure of the present invention is not limited to that shown in FIG. 1, for example, a circular opening formed in the center of the lid of the container and a quadrilateral sealing material that seals the circular opening. Can also be configured.

As described above, the opening structure according to the present invention is provided with a non-adhesive portion having a predetermined width from the end surface of the opening edge on the periphery of the opening portion. It is possible to effectively prevent the peripheral edge portion or the end face of the blade from being destroyed together with the peeling of the pull tab. Therefore, it is possible to effectively protect the end face of the container opening and prevent abnormal peeling by means that are simple in terms of structure and manufacturing process. Moreover, since the opening structure by this invention consists of said structure, an inner surface film is destroyed and removed rapidly and cleanly along a junction part with a pull tab simultaneously with peeling of a pull tab.

The perspective view which shows one specific example of a paper can. Sectional drawing which shows the opening structure which concerns on one embodiment of this invention. Process sectional drawing which shows the manufacture example of the opening structure which concerns on one embodiment of this invention. Process sectional drawing which shows the manufacture example of the opening structure which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 trunk | drum 101 bottom material 102 lid material 103 drinking mouth 104 easy peel sealing material 1 container main body 2 opening part 3 inner surface film 4 pull tab

Claims (8)

An opening structure for a container formed by closing an opening for discharging and / or injecting the contents provided in a predetermined portion of the container body by an easy peel seal means,
Consists of a three-piece structure of a container body having an opening, an inner film and a pull tab,
At least the lid of the container body having the opening is a laminate including a paper layer, a synthetic resin layer, and a barrier layer,
The opening and its periphery are closed by an inner film covering the end face of the opening from the inside of the container and a pull tab covering from the outside of the container, and at least from the edge of the opening edge to the periphery of the outer surface of the opening. An opening structure in which the non-adhesive portion having a predetermined width is provided, and the inner film, the periphery of the opening, and the pull tab are joined with the opening interposed therebetween.   The opening structure of Claim 1 comprised by the member which has the opening part which coat | covered the whole surface of polyethyleneimine as a bonding adjuvant and an easy peel material, or was partially coated in the pull tab junction part of the said opening part periphery.   3. The opening structure according to claim 1, wherein the non-bonding portion is provided at a peripheral edge of an inner side surface of the opening portion so as to have a predetermined width from an end surface of the opening edge.   The opening structure according to any one of claims 1 to 3, wherein the inner surface film is broken and removed along a joint portion with the pull tab simultaneously with peeling of the pull tab.   The opening structure according to any one of claims 1 to 4, wherein the pull tab is made of a laminated film including at least a barrier layer and a synthetic resin layer.   The opening structure according to any one of claims 1 to 5, wherein the inner surface film is composed of a single-layer synthetic resin layer, a multilayer synthetic resin layer, or a laminated film including a synthetic resin layer and a barrier layer.   The opening structure according to any one of claims 1 to 6, wherein the container body having the opening includes a laminate including a paper layer, a synthetic resin layer, and a barrier layer.   The opening structure according to claim 1, wherein after the inner surface film is destroyed and removed, the inner surface film remains so as to be exposed with a predetermined width at a peripheral edge of the opening.

Images