JPS61202830A - Manufacture of packaging bag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a packaging bag, and in particular to a method for manufacturing a packaging bag in which an inner bag can be integrally manufactured using a plastic film as a material. be.

[Conventional technology]

Conventionally, various packaging bags made of plastic film have been provided, and the method for manufacturing them is generally shown in FIG. 6.

That is, a long strip-shaped plastic film 1 (hereinafter simply referred to as film 1) that has been wound up into a roll is continuously pulled out, and the longitudinal direction is drawn out at the apex 2 of the guide plate 3, which is inclined with the apex 2 of the triangular plate facing downward. Fold it in half along the . At this time, the film membrane 1a on the lower side (the front side of the manufactured bag body) is longer than the film membrane 1b on the upper side (the back side of the manufactured bag body), and this protruding piece 4 is attached to the manufactured bag body. It becomes a sealing piece.

The film 1 folded in half as described above is transported through a plurality of guide rolls 5. During this transfer, the adhesive 6 is continuously applied in a linear or band-like manner to the inner surface of the protrusion 4, and a protective release paper 7 is further applied onto the adhesive 6.

Note that a double-sided tape may be used instead of the adhesive 6, and a release paper 7 may be pasted on the double-sided tape.

During the transfer, the film 1 is intermittently fast-forwarded within the width range of the bag, and both sides are cut by a heated fusing blade 8 to form a bag.

[Problem that the invention seeks to solve]

In the method for manufacturing a packaging bag using a plastic film as described above, only the most basic single-layer bag formed from the front and back sides of the film 1 folded in half can be manufactured.

[Means for solving problems]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional packaging bag manufacturing technology, an object of the present invention is to provide a method for manufacturing a packaging bag having an integral inner bag.

Another object of the present invention is to provide a method for manufacturing a packaging bag in which the inner bag is divided into a plurality of sections.

A further object of the present invention is to provide a method for manufacturing a packaging bag in which an inner bag is attached to the surface of the bag to make the contents easier to see.

The present invention will be described in detail below with reference to the drawings.

In FIG. 1, a long strip-shaped plastic film 10 (hereinafter simply referred to as film 10) is wound into a roll.
It is the same as the conventional method that the paper is continuously pulled out, folded in half at the apex 12 of the triangular guide plate 11, and then transported horizontally.

In the present invention, when the bag is folded in half, the surface of the produced bag is on the upper side, and the upper film membrane 10a is
Lower film membrane 10b forming the back surface of the manufactured bag
This protruding piece 13 will form the sealing piece of the bag.

Along the length direction of the folded film 10, a long strip-shaped inner pouch membrane 14 is continuously interposed in parallel between the film membrane 10a and the film membrane 10b. This inner bag 1
1114 is made of the same material as the film 10 which will be described later, and is positioned inside the opening of the manufactured bag body, and this inner bag membrane 14 is pulled out to fold the film 1o in half. After folding or folding in half,
It is positioned in advance and can be transported together with the film 1o. The inner pouch membrane 14 has a length from the opening of the pouch to the inner middle portion.

The film 1o folded in half as described above is flipped upward, and the film 10. The vertical positions of a and film lOb are reversed from the above. This is because the adhesive is applied to the inner surface of the protruding piece 13 by means similar to the conventional method, and the release paper is attached to the adhesive surface. Note that if it is possible to apply the adhesive and attach the release paper from the bottom, it is not necessary to turn the film membrane 10a and the film membrane 10b upside down. Further, in the case of the present invention, double-sided tape may be used instead of the adhesive.

After completing the steps of applying the adhesive and pasting the release paper, the film 10 is further turned over and transported, and as in the past, the film 10 is intermittently fast-forwarded by an intermittent fast-forwarding mechanism (not shown) to the lateral middle of the bag to be manufactured. Ru. During the transfer, as shown in FIGS. 1 and 2, the film membrane 10a on the surface side of the bag body and the lower part of the inner bag membrane 14 are welded 16 by ultrasonic heating 15, and the two become integral. At this time, in order to prevent the film membrane 10b from being welded together, the inner bag membrane 14 and the film membrane 10b are
A heat insulating plate 17 made of an appropriate material such as metal, synthetic resin, wood, or cardboard is installed between the holes 1 and 2b. The plate body 17 allows the film 10 to be transferred smoothly, and is supported in a floating state so that the lower film membrane 10b is not pressed down.

Further, the film 10 and the inner bag membrane 14 are cut at predetermined intermediate portions by a conventional heat sealing method in which the film 10 and the inner bag membrane 14 are cut by heat cutting using a cutting blade 18, thereby forming a bag body 20 having an inner bag 19 as shown in FIG. That will happen.

In the above manufacturing process, the lower part of the inner pouch membrane 14 is formed into a film membrane 10.
In this case, the inner bag 19 is formed inside the surface of the bag body 20 by welding to the inner bag 19, but it is possible to further divide the inner bag 19 into a plurality of parts.

For this purpose, during the transfer of the film 10, as shown in FIG.
) and (B) are installed so as to be movable up and down, and a heat insulating plate 22 similar to that described above is installed between the inner bag membrane 14 and the film 10b.

When the film 10 stops intermittently, the heating element 21
is lowered and pressed onto the film membrane 10a, and the film membrane 10a and the inner bag membrane 14 are welded 23 to produce a bag body 20 in which the inner bag 19 is divided into a plurality of parts as shown in FIG.

When the heating element 21 is one, the inner bag 19 is divided into two parts, and when two heating elements 21 are installed in parallel, the inner bag 19 is divided into two parts.
is divided into three parts. The manner in which the inner bag 19 is divided, the number of divisions, etc. are selected and determined depending on the intended use, size, etc. of the bag body 20.

Either of the welding 16 using the ultrasonic heating 15 and the welding 23 using the heating body 21 may be performed first.

The plastic film 10 described above may be made of any material that is made of thermoplastic synthetic resin and can be thermally cut. For example, stretched films of polypropylene or polyester, unstretched films of polypropylene or polyester, laminate films thereof (e.g. stretched polyester film-unstretched polypropylene film, stretched polypropylene film-unstretched polyethylene film, stretched polypropylene film-unstretched polypropylene film, etc. ) etc. can be used.

Such a film may be transparent, or may be entirely or partially colored or pattern-printed.

〔effect〕

According to the present invention described above, it is possible to automatically mass-produce a packaging bag having an inner bag 19 using the plastic film 1, and such a bag body 20 can be used for, for example, envelopes, postcards, stamps, sealing paper, etc. It is possible to organize and store each product. Therefore, when storing several types of products, it is not necessary to mix them.

In particular, since the protrusion 13 that serves as the sealing piece of the bag is formed on the front side of the bag 20, the protrusion 13 is bent and attached to the back side of the bag 20, so it can be shielded on the front side. Since there are no objects, the interior is easy to see and the contents can be easily confirmed.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the schematic steps of the method of the present invention, Fig. 2 is a side view of the state in which the upper film membrane and the inner bag membrane are welded, Fig. 3 is a cross-sectional view of the manufactured bag body, and Fig. 4 (A) and (B) are a plan view and a side view showing the state in which the inner bag is divided;
The figure is a front view of a bag body with an inner bag divided into sections, and FIG. 6 is a plan view showing a conventional bag manufacturing process. 10 is a plastic film, 10a and 10b are film membranes, 13 is a protruding piece, 14 is an inner bag membrane, 15 is ultrasonic heating, 16 is welding, 17 is a heat insulating plate, 18 is a fusing blade, 19
20 is an inner bag, 20 is a bag body, 21 is a heating body, 22 is a heat insulating plate body, and 23 is a welding body.

Claims (2)

[Claims] (1) Fold the plastic film 10 in half along the length direction, and make the upper film membrane 10a protrude longer than the lower film membrane 10b to form a protruding piece 13, and an inner bag between both film membranes 10a and 10b. A step of transferring the membrane 14 between the upper film membrane 10a and the inner bag membrane 14.
A method for manufacturing a packaging bag, comprising the steps of: welding the lower part of the film 10 and the inner pouch membrane 14 together using a thermal sealing method. (2) The plastic film 10 is folded in two along the length direction, and the upper film membrane 10a protrudes longer than the lower film membrane 10b to form a protruding piece 13, and an inner bag is formed between both film membranes 10a and 10b. A step of transferring the membrane 14 between the upper film membrane 10a and the inner bag membrane 14.
A packaging bag characterized by comprising the steps of welding the lower part of the film 10 and the inner pouch membrane 14, dividing the inner pouch membrane 14 into a plurality of parts, and cutting both sides of the film 10 and the inner pouch membrane 14 by a heat-sealing method. manufacturing method.