JPS5943228Y2 - Plastic bag - Google Patents

Description

[Detailed description of the invention] Conventionally, as shown in FIG. 3, this type of device was designed by appropriately heat-sealing the inner edges of the film 1 and the backing layer 2 to seal the inner edges of the bag opening 3 at both ends K>
The opening where the wire was inserted was also heat sealed with the same width as the wire.

Therefore, when opening the bag, especially when inserting a hopper or the like into the opening of the bag against the VC to be filled with contents, it is necessary to
) K has the disadvantage that it is easily damaged along heat-sealed lines such as the heat-sealed inner line m when external force is applied.

The present invention relates to a synthetic resin bag that overcomes these drawbacks.Specifically, the present invention relates to a synthetic resin bag that is made of synthetic resin that is strong against external force when opening the bag, and the edges of the bag are heat-sealed to form a bag body on both sides of the bag opening. This is a resin packaging bag, and an example of its implementation will be described below with reference to the drawings.

The bag A has any form and structure well known in this technical field, that is, it has a heat sealing property or is made of a synthetic resin film that has been given a heat sealing property. is heat-sealed to an appropriate width LK to form a bag shape. In this case, the bag shape is made by folding a single film in half and heat-sealing both sides of the film, or by heat-sealing both sides of the film. Two films, 1 and back layer 2, are superimposed and both sides and lower edges are heat-sealed, or a so-called protruding piece 4 is formed in which the upper end of back layer 2 protrudes from the upper end of film forming 1. The upper edge is the bag opening 3, or the film 1 and the backing layer 2 have the same thickness, a cut is made in one of the membranes to serve as the bag opening, and the entire periphery is heat-sealed by overlapping them. You can select any shape such as vertically long, horizontally long, or rectangular.

The film 1 and the back layer 2 are made of a synthetic resin film (sheet) that has heat sealability or has been given heat sealability, and which one to use as the film or the back layer should be determined depending on the purpose of use. It is arbitrarily selected, and both films 1 and 2
Both sides of the bag are heat-sealed 5 to a width of LK as appropriate to form the bag A as described above.

In this case, the synthetic film (sheet) with heat-sealing properties includes, for example, a single film of polyolefin-based synthetic resin film (polyethylene film, polypropylene film, modified films of these films, etc.), vinyl chloride-based, polyamide-based, polyester, etc. or polystyrene-based synthetic resin film, a single film or modified film, a lamination film of these, a composite film such as a composite film, etc. Films with heat-sealable properties refer to various films that do not have heat-sealable properties. coated film, which is a synthetic resin film coated entirely or partially with a heat-sealing substance; It is a film (sheet), and its structure is not particularly limited to the above.

The bag opening 3ri is a mouth part for storing things in the bag body A, and the heat-sealed parts 5' on both sides thereof are gradually narrower than the width of the heat-sealed parts 5 on the other both sides. The upper end thereof is inclined outward at the shape 5, and an expanded non-thermal sealing portion 6 is provided.

M-/-#i5' Both edges of the bag opening 3 are tapered or arcuately inclined outward so that the upper end is wider than the heat-sealed width of the Ufi seal part 5. It is sealed, and the upper end width L' is 0.
By setting it to about 1 to -0.85 times and gradually becoming narrower, expanded non-thermal seal parts 6 are formed on both sides of the bag opening 3.

In the present invention, a bag body is formed by heat-sealing both sides of a surface layer and a lining made of a synthetic, first fat film having heat-sealability or heat-sealability to an appropriate width, and forming a bag body on both sides of the bag opening. Part V
The upper end of the heat-sealed part is heat-sealed in an inclined shape toward the outside so that it becomes gradually narrower than the inside, so it can be used with various opening filling jigs when storing items inside the bag. Even when the bag opening is expanded, external force is not concentratedly applied to the apex as in the conventional case, but the opening force is received by the inclined line, so there is less peeling and breakage, and the bag can withstand opening.

Furthermore, since the expandable non-thermal seal portions are formed on both sides of the bag opening, the opening becomes larger, making it easier to store items.

[Brief explanation of the drawing]

The drawing shows an example of the implementation of the synthetic resin bag of the present invention.
Fig. 1 is a perspective view, Fig. 2 is an enlarged front view of main parts, and Fig. 3 is an enlarged front view of a conventional model with a part cut away. Surface layer, 2 is lining, 3 is bag opening,
5 and 5' are heat-sealed parts, and 1 and 1' are their heat-sealed widths.

Claims (1)

[Scope of utility model registration request] A bag body is formed by appropriately heat-sealing both side edges of a synthetic resin film having heat-sealing properties or a synthetic resin film imparted with heat-sealing properties and a backing layer, and the heat-sealing is carried out on both sides of the bag opening. A plastic bag made of synthetic resin, the upper end of which is heat-sealed so that it slopes outward so that it gradually becomes a hill-like shape than the inside.