JP4717632B2 - Pull-tab opening structure for containers - Google Patents

Description

  The present invention relates to an opening structure that constitutes an opening such as a drinking mouth, a discharge opening, and a pouring opening in various containers, and more particularly to a pull tab opening structure for a container that is closed by a pull tab as 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 pull tab opening structure of the conventional paper container drinking mouth, when peeling the pull tab as a closed easy peel sealing material, the end of the pull tab may be in close contact with the outer surface of the container, It may not be easy to pick up this with a finger.

  Further, in the conventional opening structure, there is also a problem that the paper material at the edge of the peripheral edge of the opening part is partially peeled off with the peeling of the sealing material. 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 exfoliation difficulty and abnormal exfoliation, it is effective to preliminarily cover and protect the peripheral edge of the opening with a resin film layer such as polyethylene. This is complicated and disadvantageous in terms of manufacturing cost.

  The present invention has been made in view of the above-described points, can perform reliable and easy peeling, prevents deformation of the opening due to abnormal peeling, and simplifies the manufacturing process and reduces costs. It is an object of the present invention to provide an easy-peeling pull tab opening structure for a container that is advantageous in both of the above-described processes.

  In order to solve the above-described problems, the container pull-tab opening structure according to the present invention has an opening for discharging and / or injecting the contents provided in a predetermined portion of the container body by an easy peel sealing means. A pull tab opening structure for a container that is closed, wherein the opening and its periphery are covered by a pull tab as an easy peel seal means from the outside of the container, and at the end of the pull tab A non-adhesive part with the container surface is formed by a folded structure in which at least a part is folded.

  As described above, the pull tab opening structure according to the present invention has a non-adhesive portion with the container surface formed by a folded structure in which a part of the pull tab end portion is folded back to the container surface side. Both pull tab stripping can be facilitated and ensured.

  In a preferred embodiment of the present invention, the opening and its periphery are also closed by an inner film covering the opening end face from the inside of the container, and the opening edge end face extends from the opening edge to the periphery of at least the outer face of the opening. Since the inner film, the periphery of the opening, and the pull tab are bonded to each other with the non-adhesive portion having a predetermined width interposed therebetween, the peripheral edge of the opening is removed when the pull tab is peeled off. Or the situation where an end surface is destroyed with peeling of a pull tab can be prevented effectively.

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

  Furthermore, in a preferred aspect of the present invention, the non-adhesive portion is also provided at the periphery of the inner side surface of the opening so as to have a predetermined width from the end surface of the opening edge.

  Furthermore, in the opening structure according to the present invention, when the inner film is provided, the inner film is quickly and cleanly broken and removed along the joint portion with the pull tab simultaneously with the peeling of the pull tab.

  In a preferred embodiment of the present invention, the pull tab is made of a laminated film including at least a barrier layer and a synthetic resin layer. Moreover, when forming an inner surface film, this inner surface film can be comprised by the laminated | multilayer film containing a single layer synthetic resin layer, a multilayer synthetic resin layer, or a synthetic resin layer and a barrier layer.

  Moreover, in this invention, the container main body which has an opening part can consist of a laminated body containing a paper layer, a synthetic resin layer, and a barrier layer.

  In the present invention, when an inner surface film is provided, the inner surface film is left so as to be exposed at a peripheral edge of the opening portion after the inner surface film is destroyed and removed when the pull tab is 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, and 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 pull tab opening structure according to the present invention is shown in the cross-sectional view of FIG.

  In the pull tab opening structure shown in FIG. 2, an opening 2 provided in a paper container 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. Yes. In the present invention, the inner film 3 is not always necessary. The pull tab 4 is composed of a laminate of a barrier material 5 and a synthetic resin layer 6.

  In the present invention, a folded structure 4a is formed at the end of the pull tab 4, and the folded structure in this case is a folded structure on the container surface side, and this part constitutes a non-adhesive part. Therefore, the folded structure portion 4a can be easily picked up, and the easy peel property can be further improved.

  Furthermore, in a preferable example of the opening structure of the present invention, in the structure in which the inner surface film 3 and the pull tab 4 are joined, the container surface and the pull tab 4 are joined at the portion of the adhesive interface A (the portion indicated by x). In addition, the inner surface film 3 and the container inner surface are joined at the adhesive interface B, and the inner film 3 and the pull tab 4 are joined at the adhesive interface C. Here, in a preferred embodiment of the opening structure of the present invention, as shown in the figure, a non-adhesive portion (a portion without x mark) having a predetermined width from the opening edge end face is provided on the periphery of the opening portion 2. The inner surface film, the peripheral edge of the opening, and the pull tab are bonded to each other with the opening interposed therebetween, thereby sealing 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.

  Further, at the bonding interface A, the pull tab 4 is bonded by an easily peelable bonding means so as to ensure easy peelability. 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 one embodiment of FIG. 3, a polyethylene layer 10a A laminate of a barrier layer 11 made of an aluminum layer or the like, a polyethylene layer 10b, a paper layer 12, and a polyethylene layer 10c can 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. 4 and FIG. 5, 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. 4A and 4B, 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. 4B, the inner film 3 and the pull tab 4 welded to the peripheral edge 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 bonded 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. 5 is a process cross-sectional view showing a forming method according to another embodiment. First, in step (a) of FIG. 5, 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. 5B, pressure bonding is performed as shown in the drawing using seal heads 71 having different shapes. 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 adhesive conditions in this case are the same as in FIG.

  Although the pull tab opening structure of the present invention can be formed by the method as described above, the present invention is not limited to the above-described embodiment.

  In the present invention, the pull tab opening structure formed as described above is characterized in that a folded structure is formed at the end of the pull tab. Preferred examples of the folded structure will be described below.

  The pull-tab folding structure of the present invention is not particularly limited, but when the pull-tab folding part (folding structure 4a in FIG. 2) is formed by heat sealing, the whole folding part is not heat-sealed, but partially. It is preferable to heat seal. This is because when the entire folded part is joined by heat sealing, the folded part is crushed, and when the pull tab is bonded to the container body, the folded structure is adhered to the container surface in a flat state. This is because it becomes easy to pick up the folded portion with a finger. As the partial heat seal, for example, a method of heat-sealing the folded portion in a stripe shape, a wave shape or a spot shape can be mentioned. Specific modes of these heat seals are shown in the plan view of FIG. That is, in the example shown in FIG. 6A, the folded portions are joined by the stripe-shaped heat seal portions 4b in which the folded structures 4a of the pull tab 4 are spaced apart at a constant interval. In the example of FIG. 6B, the heat seal portion 4b is formed in a wave shape, and in the example of FIG. 6C, the folded portion is joined by the spot-like heat seal portion 4b.

  By forming the folded structure by such partial joining, it is possible to effectively prevent the folded portion from becoming flat and closely contacting the container body, and the opening operation can be further facilitated.

  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 pull tab opening structure according to the present invention has a non-adhesive portion with the container surface formed by a folded structure in which a portion of the pull tab end portion is folded back to the container surface side. Therefore, both easy and reliable pull tab peeling can be achieved with an extremely simple structure.

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. 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. The top view which shows the aspect of the heat seal of the structure where the pull tab of the present invention folds back.

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 3 inner surface film 4 pull tab

Claims (10)

A container pull-tab opening structure in which an opening for discharging and / or injecting the contents provided in a predetermined part of the container body is closed by an easy peel sealing means,
The opening and the periphery thereof are closed by covering with a pull tab as an easy peel sealing means from the outside of the container, and at least a part of the end of the pull tab is folded back to form the container surface. A pull-tab opening structure characterized in that a non-adhesive portion is formed.   The pull tab opening structure according to claim 1, wherein the opening and its periphery are also closed by an inner film covering the opening end face from the inner side of the container.   3. The pull tab opening structure according to claim 1, wherein a pull tab opening structure according to claim 1 or 2 is configured by a member having an opening part in which polyethyleneimine is entirely coated or partially coated as an adhesion assistant and easy peel material on the pull tab joint part on the periphery of the opening part.   A 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, and the inner film, the periphery of the opening, and the pull tab are joined with the opening interposed therebetween. The pull tab opening structure according to any one of claims 1 to 3.   The pull-tab opening structure according to any one of claims 2 to 4, 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 pull tab opening structure according to any one of claims 2 to 5, 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 pull tab opening structure according to any one of claims 1 to 6, wherein the pull tab is made of a laminated film including at least a barrier layer and a synthetic resin layer.   The pull-tab opening structure according to any one of claims 1 to 7, wherein the inner film is made 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 pull tab opening structure according to any one of claims 1 to 8, wherein the container body having the opening is made of a laminate including a paper layer, a synthetic resin layer, and a barrier layer.   The pull tab opening structure according to any one of claims 2 to 9, wherein the inner film is left so as to be exposed at a peripheral edge of the opening with a predetermined width after the inner film is destroyed and removed.

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