JPH0115640Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a bag having a straw piercing portion that facilitates piercing of a straw by irradiation with laser light.

``Prior Art'' Today, a self-supporting packaging bag as shown in FIG. 1 is used as a sales container for beverages such as youth drinks. In order to provide a straw hole B in such a bag, conventionally, as shown in FIG.
After punching the hole B1 in the sheet-like material 10 consisting of 2, the inner layer 20 is laminated to close one end of the hole B1, or as in the case of the packaging bag described in Japanese Utility Model Application No. 56-62944. In other words, as shown in FIG. 3, the outer wall surface of the bag body is provided with uneven parts by embossing at appropriate positions, i.e., as shown in FIG. By pressing the plate 14 and providing a straw piercing portion consisting of an embossed concave and convex portion in a checkerboard pattern on the outer layer 13 of the bag body, the tip of the straw is prevented from slipping when piercing the straw, making it easier to poke the straw. Either of these configurations has been adopted.

``Problems to be Solved by the Invention'' However, these conventional bags having straw holes or straw piercing portions have the following drawbacks. That is, the hole B1 shown in FIG.
Not only is the step of drilling holes B1 required, but also the sheet material 10 and the layer 20 must be laminated after drilling the hole B1. There is a fatal disadvantage that the process of laminating layers 10 and 20 must be done twice, and furthermore, the process of laminating holes B only with layer 20
Merely covering 1 may not provide sufficient barrier properties.

In addition, if the constituent material of the layer 12 is a material lacking in heat-sealing properties such as aluminum foil, the sheet-like material 10 and the layer 20 must be laminated by a dry lamination method. When combined, the adhesive applied part is hole B1.
This is undesirable from a food hygiene perspective.

On the other hand, in the method of forming uneven parts by embossing at appropriate positions on the outer wall surface of the bag body as in the packaging bag described in Utility Model Application No. 56-62944, there is a limit to the depth of the uneven parts by embossing, and the tip of the straw Although this can prevent the straw from slipping to a certain extent, the piercing strength of the bag itself remains almost the same, so it has the disadvantage that it requires some skill in how to pierce the straw, making it difficult to pierce.

"Means for Solving the Problems" As a result of research to solve the above-mentioned drawbacks, the present inventor laminated a thermoadhesive resin layer on one side of aluminum foil, and a single or double layer on the other side. In a bag made of a laminated material in which more than one puncture-resistant material layer is laminated, a portion of the puncture-resistant material layer of the laminated material is removed by irradiation with carbon dioxide laser light, and the heat-adhesive resin layer and aluminum foil are bonded together. For straws with a two-layered straw piercing part, the puncture-resistant material layer of the straw piercing part is partially removed by irradiation with laser light, and the straw piercing-resistant material layer is We discovered that burrs exist around the periphery of the opening created by the irradiation of light, and that these burrs function to prevent the straw from slipping, making it much easier to stick the straw in than with conventional products. Based on this, the present invention was completed.

That is, the key material of the present invention is a bag made of a laminated material in which a heat-adhesive resin layer is laminated on one side of aluminum foil, and a single layer or two or more layers of puncture-resistant material are laminated on the other side. , wherein a portion of the puncture-resistant material layer of the laminated material is removed by irradiation with carbon dioxide laser light to form a straw puncture portion made of two layers: a heat-adhesive resin layer and an aluminum foil. This bag has a straw piercing part.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 4 shows a self-supporting bag 1 having a straw piercing part according to the present invention, and 7 represents the straw piercing part.

FIG. 5 is a partial sectional view of the bag at the straw piercing portion, in which 8a indicates one wall of the bag, 8b the other wall, and 9 a heat-sealed portion at the end of the bag.

The bag 1 of the present invention has a thermoadhesive resin layer 2 laminated on one side of an aluminum foil 3, and a single layer of plastic film, a laminate of two or more layers of plastic film, paper, or nonwoven fabric on the other side. , or a laminate material 5 in which a puncture-resistant material layer 4 made of a laminate of cellophane and plastic film is laminated.
A portion of the puncture-resistant material layer 4 is removed by irradiation with carbon dioxide laser light to form an opening 6, and the thermal adhesive resin layer 2 is partially formed in the opening.
A straw piercing portion 7 is formed of two layers of aluminum foil 3 and aluminum foil 3.

Therefore, in the present invention, as the thermal adhesive resin layer of the laminate, unstretched low density polyethylene, unstretched medium density polyethylene, unstretched high density polyethylene,
Unstretched polypropylene, ethylene vinyl acetate copolymer, etc. can be used.

Next, in the present invention, as a puncture-resistant material layer, a single piece of plastic film such as oriented nylon, oriented polypropylene, oriented polyester, oriented polyethylene, polyvinyl chloride, polystyrene, etc.
or a laminate thereof, or paper, nonwoven fabric, or cellophane and stretched nylon, stretched polypropylene,
Laminates with plastic films such as oriented polyester, oriented polyethylene, polyvinyl chloride, polystyrene, etc. can be applied. Further, a layer having the above-mentioned layer structure and further laminated with unstretched polypropylene or unstretched polyethylene may also be used as the puncture-resistant material layer. However, in that case, unstretched polypropylene or unstretched polyethylene tends to be difficult to process by irradiation with carbon dioxide laser light, so it is necessary to laminate unstretched polypropylene or unstretched polyethylene on the aluminum foil side.

Figures 6a to 6(1) show examples of the opening 6 in the present invention. As illustrated here, the opening 6 can be formed in various shapes.

Next, the formation of the opening 6 of the bag 1 of the present invention by irradiation with carbon dioxide laser light will be explained.

As shown in FIG. 7, a light-blocking material such as stainless steel, tungsten, copper, molybdenum, etc., having an opening of a desired shape on the 4th surface of the puncture-resistant material layer.
A carbon dioxide gas laser beam 23 is irradiated through an aperture mask 21 made of aluminum, paperboard, etc. and through a converging lens 22 to remove a portion of the puncture-resistant material layer 4 into the desired shape to form an opening 6. Note that the opening 6 may be formed at any time before or after bag manufacturing.

In the bag of the present invention, there are burrs around the opening 6 that are generated when carbon dioxide laser light is irradiated, and these burrs function to prevent the straw from slipping. By concentrating the force on one point, the aluminum foil and the thermoadhesive resin layer can be torn and the straw can be pierced very easily.

``Effects of the invention'' As detailed above, the bag of the invention not only makes it extremely easy to pierce a straw, but also has excellent gas barrier properties because the aluminum foil is not damaged in any way by laser light irradiation. and
Further, the adhesive between the aluminum foil and the puncture-resistant material layer is also removed by laser light irradiation, and the adhesive layer is not exposed inside the opening, which is excellent in terms of hygiene. Furthermore, the bag of the present invention has the advantage that it can be produced continuously at high speed without contact or pressure, unlike embossing or the like, by irradiating the bag with laser light in the same process as packaging and manufacturing.

Next, the present invention will be specifically explained with reference to Examples.

Example 1 Folded with a laminated material with a layer structure of polyester (12μ)/printed layer/stretched polyethylene (20μ)/aluminum foil (9μ)/ethylene vinyl acetate copolymer (80μ) laminated by dry lamination method A self-supporting bag with a bottom was created. A carbon dioxide laser beam with a wavelength of 10.6 μm is applied to a part of the surface of this self-supporting bag using a pulse oscillation type carbon dioxide laser (Model No. 920-LB Shibuya Kogyo Co., Ltd.) through an aperture made of die-cut stainless steel. A straw piercing portion is formed by removing a portion of both the polyester and expanded polyethylene layers by irradiating laser light through a mask and then through an aperture mask, focused by a focusing lens, to form an opening. Got a bag.

When a straw was inserted into the straw insertion part of this bag, the straw could be inserted easily by concentrating force on one point without causing the straw to slip, and the contents of the self-supporting bag could be sucked out.

Further, when the periphery of the opening was observed under a microscope, it was found that burrs were formed, and it was found that these burrs functioned to prevent the straw from slipping.

Example 2 Layer of polyethylene (20μ)/printing layer/paper (140g/m ² )/polyethylene (15μ)/aluminum foil (9μ)/polyethylene (50μ) laminated for dry lamination method or extrusion lamination method A base paper for winding a self-supporting bag-type paper container with the following configuration was prepared.

A part of this winding base paper is a carbon dioxide laser pulse oscillation type (Model No. 920-L-B Shibuya Kogyo)
Co., Ltd., and irradiated with carbon dioxide laser light with a wavelength of 10.6 μm.

This carbon dioxide gas laser beam passed through a stainless steel aperture mask cut out with an asterisk (*), was further focused by a focusing lens, and irradiated a portion of the rolled base paper with high energy density.

This time, the polyethylene outside the aluminum foil,
In order to remove a portion of each layer: printing layer, paper, and polyethylene, the distance ratio between the aperture mask and the focusing lens, and between the focusing lens and the base paper was 4.5:1. Under these conditions, 15 shots of carbon dioxide laser light irradiation (1.5 seconds)
I was able to remove a portion of each of the above layers.

As a result of sticking a straw into this part, it was confirmed that the straw could be inserted easily and that it could be used as a suction hole.

In addition, in the case of paper, it was found that there is a step equal to the paper thickness between the part evaporated by the laser beam and the part not evaporated, and this step makes it extremely easy to fix the tip of the straw.

[Brief explanation of the drawing]

1 to 3 show a conventional bag having a straw hole, FIG. 1 is a perspective view, and FIGS. 2 and 3 are partially cutaway enlarged sectional views illustrating the state in which the straw hole is being made. 4 and 5 show one embodiment of the bag of the present invention, FIG. 4 is a perspective view, FIG. 5 is a partial sectional view, and FIGS. 6 a to (1) show various shapes of the opening. A schematic diagram showing an example, and FIG. 7 are cross-sectional views showing the process of forming an opening. DESCRIPTION OF SYMBOLS 1... Bag, 2... Heat-adhesive resin layer, 3... Aluminum foil, 4... Puncture-resistant material layer, 5... Laminated material, 6... Opening, 7... Straw piercing part.

Claims (1)

[Scope of utility model registration request] In a bag made of a laminate material in which a thermoadhesive resin layer is laminated on one side of aluminum foil and a puncture-resistant material layer made of a single layer or a laminate of two or more layers is laminated on the other side, the laminate A straw piercing device characterized in that a portion of the piercing-resistant material layer of the material is removed by irradiation with carbon dioxide laser light to form a straw piercing portion made of a two-layered heat-adhesive resin layer and aluminum foil. bag with parts.