JPS6042024B2 - Bag manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing a bag, and more particularly a bag made of plastic film, which can be manufactured in one step and is suitable for automatic bag making.

The shape of the bag most similar to the present invention is the bag shown in FIG. 5 devised by the applicant of the present invention.

That is, the bag has an insert piece 2' made of plastic (for example, synthetic paper) interposed in the upper part of the packaging body 9' made of plastic film in order to form a label part completely isolated from the packaged product. , the insertion piece 2' is thermally welded to the housing body 9' at the time of thermal weld sealing to form the housing body 9', and a compartment seal portion 3' for isolating the insertion piece 2' is provided by thermal welding, and the bag body 11 is The opening 13' is formed at the bottom on the opposite side from the compartment sealing part 3', and one piece is extended to form a foldable sealing piece 6''. However, in a bag body of this shape, The sealing process is very complicated, such as applying adhesive separately and folding the bag using adhesive, or securing the folded bag with a stapler during use. It was requested that they be manufactured at the same time.

However, when manufacturing the above-mentioned bags, providing a sealing means at the same time as manufacturing the packaging body remains a technical problem and remains an unresolved problem.

The present invention aims to solve these problems, but with the bag, products must always be inserted from the bottom of the bag, and because the bottom is sealed, the product is extremely inconvenient when hung at a store. To solve the problem of the appearance and the fact that the sealing must be done by folding the sealing piece or by stapling, etc. In particular, the method for sealing the opening of the bag can be done in one step at the same time as manufacturing the bag body. The purpose of the present invention is to provide a method for manufacturing bags that is completely new, practical, and suitable for automation.

That is, in the bag manufacturing method of the present invention, one piece a of the packaging body made of plastic film is extended and bent from the other piece b, and an insertion piece 2 made of plastic that is thicker than the plastic film is inserted into the folded part 1. A compartment seal part 3 for inserting and isolating the insertion piece 2 is provided by heat welding, and a film extending further downward from the compartment seal part 3 is used as a sealing piece 6 of the opening 13, and the sealing piece 6
An adhesive layer 4 is provided in advance on the inner side or the opposing surface side, and a mold release material 5 treated by applying a silicone resin to the upper surface of the adhesive layer 4 is applied so that its upper edge 5'' is the root of the sealing piece 6. located near the compartment seal portion 3 and whose lower edge 5''
is positioned so that it is located at least below the lower edge 6'' of the sealing piece 6, and then the both side edges 7, 7'', 10, 1'', 8, 8'' of the packaging body and the bent portion 1 are thermally welded at the same time. By sealing, the insertion piece 2 is heat-sealed within the folded portion 1, and the sealing piece 6 is formed to be openable and closable without being heat-sealed to the main body.

As described above, the gist of the bag manufacturing method according to the present invention is that the hanging portion and the sealing means can be manufactured at the same time as the packaging body is manufactured.

Therefore, the following effects were obtained by the present invention.

(1) At the same time as the packaging body is manufactured, the insertion piece in the hanging portion and the sealing piece can be manufactured using a release material.

Therefore, the bag can be manufactured in one process, and the bag can be manufactured without the need for a separate sealing means as in the past, which dramatically improves the bag manufacturing process and makes it suitable for mass production and automation. It has achieved exceptional effects such as being able to manufacture bags at low cost! There are things. In other words, it is possible to adopt an automatic bag making method with both sides sealed, which has the practical benefit of being mass-produced at low cost. (2) Next, the sealing piece is formed at the same time as the heat-cut sealing of the packaging body, and the inner surface of the formed sealing piece is coated with a release material treated with 4 silicone resin, and the upper edge of the sealing piece is attached to the base of the sealing piece. Since it is located near a certain compartment seal part and its lower edge is located at least below the lower edge of the sealing piece, the sealing piece is not welded to the main body during heat-cutting sealing, and the heat-cutting seal is removed. The product can be opened and closed freely by opening the sealing piece, and by peeling off the release material after insertion, the opening of the bag can be easily closed with the sealing piece through the adhesive. This is possible.

As described above, according to the present invention, the sealing piece of the bag can be formed at the same time as the packaging body is manufactured, and the formed sealing piece can be opened and closed without being thermally welded, resulting in a structure that allows for easy loading and unloading of products. be.

Embodiments of the present invention will be described below according to an example shown in the drawings.

First, one piece a of a heat-cuttable plastic film made of a thermoplastic synthetic resin such as polyethylene is extended and bent from the other piece b, and a piece of synthetic paper made of thicker synthetic paper than the film is inserted into the bent part 1. As the piece 2 is inserted, the compartment seal portion 3 of the insertion piece 2 is formed by heat sealing, and the piece a is further extended downwardly from the seal portion 3 of the compartment.

Next, a mold release material 5 coated with silicone resin is interposed inside the extended piece a to form a sealing piece 6 via an adhesive layer 4 applied in advance.

The continuous film thus constructed has a predetermined width and its both side edges 7, 7'' are heat-sealed and sealed to form the bag 11.

That is, when both side edges 7, 7'' of the housing body 9 are thermally welded, the insertion piece 2 made of thermoplastic synthetic resin which can be thermally welded is thermally welded to the housing body 9 at both side edges 8, 8'' at the same time. At this time, since the upper and lower films immediately below the insertion piece 2 are heat-sealed in the lateral direction to form the partitioned sealed portion 3, the insertion piece 2 is in an isolated state.

Further, when the both side edges 7, 7'' of the packaging body 9 are heat-sealed, both the side edges 10, 1' of the sealing piece 6 and the both side edges 7, 7'' of the packaging body 9 are heat-sealed.
7'' from being thermally welded to each other, a silicone-treated mold release material 5 is interposed on the inner surface of the sealing piece 6.Moreover, the mold release material 5 has an upper edge thereof. 5
'' is located near the compartment seal portion 3, which is the base of the sealing piece 6, and its lower edge 5'' is positioned at least below the lower edge 6'' of the sealing piece 6.Therefore, the When sealing both sides of the main body, both side edges of the sealing piece are not thermally bonded to the main body due to the interposition of the mold release material 5.

Next, the manufacturing method will be explained in more detail with reference to the drawings.

First, as shown in Fig. 1A, one piece a of a belt-shaped heat-fusible film is bent and extended from the other piece b, and an adhesive layer is applied to the inner surface of the tip of the extended piece a, which corresponds to the sealing piece 6. 4, and then a mold release material 5 treated with silicone resin is adhered onto the adhesive layer 4.

At this time, as shown in the opening in the same figure, the release material 5 has its upper edge 5'' located near the compartment sealing part 3, which is the root of the sealing piece 6, and its lower edge 5'' is located near the lower end of the sealing piece 6. The dimensions are set in advance so that it is extended and positioned to match the edge 6''.Next, while folding the extended piece a, insert it into the bent part 1 as shown in the opening and c of the figure. By inserting the insertion piece 2 into the folding part 2 and heat-sealing the upper and lower films immediately below the insertion piece 2 to form a compartment seal part 3 and isolating the insertion piece 2 in the folded part 1, the compartment seal part 3 to form a product insertion side 11 and a hanging side 12.Next, the continuous strip film thus formed is thermally cut at both side edges 7, 7'' to a predetermined width as shown in Figure 2. Both side edges 8, 8'' of the insertion piece 2 of the hanging portion 12 are heat-sealed to the film of the mounting body 9 and are completely heat-welded.

On the other hand, even if the extended film immediately below the partition sealing portion 3 is thermally cut during the thermal sealing of both side edges 7, 7'' of the mounting body 9, the inner surface of the film is covered with a silicone-treated mold release material. is positioned so that its upper edge 5'' is located in the vicinity of the compartment seal portion 3, which is the base of the sealing piece 6, and its lower edge 5'' is extended to match the lower edge 6'' of the sealing piece 6. Since the mold release material 5 blocks the heat welding seal and prevents heat welding, the extension film with the heat welding blocked can be opened and closed as a sealing piece 6. It is formed. By thermally cutting the continuous strip-shaped film to a predetermined width in this manner, a bag 14 as shown in FIGS. 2 to 4 is manufactured.

In the bag 11 manufactured in this way, after opening the sealing piece 6 and putting the product through the opening 13, the release material 5 on the inner surface of the sealing piece 6 is peeled off, and the product is placed in the opening 13 through the adhesive layer 4. The opening can be sealed by tightly closing the opening.

As described above, when heat-sealing both sides of the packaging body 9, the insertion piece 2 can also be heat-welded to the bag body 9 at the same time, and the sealing piece can be used as a sealing piece that can be opened and closed without being heat-welded to the packaging body 9 during production of the packaging body. This can be done in one process, and bags can be made using an automatic bag-making method with both side seals, making it possible to mass-produce them at low cost. Both sides are formed so that they can be opened and closed without being thermally welded due to the interposition of a silicone-treated mold release material, making it convenient to use the sealing piece as a bag.

In this embodiment, the adhesive layer 4 is provided on the inner surface of the sealing piece, but it may also be provided on the opposing surface of the sealing piece.
Further, the lower edge 5'' of the silicone-treated mold release material 5 is located at the same position as the lower edge 6'' of the sealing piece 6, or extends downward from it, and its upper edge 5'' is the root of the sealing piece 6. The mold release material 5 is required to be located near the compartment seal portion 3, that is, the mold release material 5 must be interposed on the inner surface of the sealing piece 6 at least approximately in the same width as the sealing piece 6.

[Brief explanation of the drawing]

Figure 1 shows the manufacturing process of the bag;
C is a plan view, and 2 is the same plan view when thermally welded and sealed. Figure 2 is a front view of the bag after manufacture. Figure 3 is a side view of the same. FIG. 4 is a longitudinal sectional view of the same. FIG. 5 is a longitudinal sectional view of a bag showing a conventional example. a...one piece, b...other piece, 1...
...Bent part, 2...Insert piece, 3...
Compartment seal portion, 4... Adhesive layer, 5...
Mold release material, 6...Sealing piece, 7, 7'' side edge, 8,
8″...Side edge, 9...Main body, 13...
····Aperture.

Claims (1)

[Claims] 1. One piece a of the bag body made of plastic film is extended and bent from the other piece b, and an insertion piece 2 made of plastic thicker than the plastic film is inserted into the folded part 1, and the insertion piece 2 is isolated. A compartment sealing part 3 is provided by heat welding, and the film extending downward from the compartment sealing part 3 is attached to the opening 1 above the bag body.
3, an adhesive layer 4 is provided in advance on the inner side or the opposite side of the sealing piece 6, and a release material 5 is coated with silicone resin on the upper surface, and the upper edge 5'' thereof is It is positioned and arranged so that it is located near the compartment seal part 3 which is the root part of the sealing piece 6, and its lower edge 5' is located at least below the lower edge 6' of the sealing piece 6, and then By heat-sealing both side edges 7, 7', 10, 10', 8, 8' of the portion 1 at the same time, the insertion piece 2 is heat-sealed within the bent portion 1, and the sealing piece 6 is sealed into the bag. A method for manufacturing a bag, characterized in that the bag is formed to be openable and closable without thermally sealing the main body.