JPS5872412A - Preparation of bag with gusset of plastic sheet or film - Google Patents

Abstract

PURPOSE:To prepare a plastic sheet bag with gussets by thermal adhesion by using a unit that is provided with gusset-forming pieces at the outer edge of a divider piece. CONSTITUTION:Unit A has gusset-forming pieces 3 at the outer edges of three sides excepting one side that makes an opening part of a rectangular divider piece 4. The outer edge of the gusset-forming piece 3 of this unit A is placed along the adhesive surface 2' of a mold 2 put on the supporting board 1 of a high frequency welder and the outer edge of the divider piece 4' of another unit A' is put on the outer edge of the gusset-forming piece 3. A pressure plate 5 is allowed to fall to apply high frequency voltage under pressure. The gusset- forming piece 3 of unit A and the divider piece 4' of unit A' are welded. a bag with two gussets that are formed by gusset-forming pieces 3, 3' is completed on both outer edge sides of the divider piece 4'. In order to manufacture a bag with many gussets the outer edges of the dividing pieces of an unadhesive unit are laminated and welded by the repetition of the same processes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing gusseted bags made of plastic sheets or films using an internal heating bonding machine such as a high frequency welder or an external heating bonding machine such as a heat sealer. .

Conventionally, bags with multiple gussets, which are used for bags, are manufactured by gluing paper with adhesive or sewing cloth, etc., and are manufactured by heat-bonding plastic sheets (or films). had not been developed.

From the viewpoint of product strength, weight, cost, etc.,
There has been a need to develop a method for manufacturing bags with multiple gussets using plastic sheets, but in the past, it was only possible to manufacture bags with only one gusset.

That is, - form a strip from the inside (or outside) of a U-shaped mold (2) as shown in FIG. gusset forming piece (
3), align the outer edge of the gusset forming piece with the upper and lower adhesive surfaces (2/, 2/) of the mold, and then overlap the outer edge of the partition piece ('p') on the outer edge of the gusset forming piece, The pressure plate (5) on which the mold is glued is lowered and glued under pressure (first
figure). The product, shown in Figure 3, is used for packaging tights, etc.

Therefore, an object of the present invention is to provide a method for easily manufacturing a bag having a plurality of gussets using a unit made of a plastic sheet or film and provided with gusset forming pieces on the outer edges of partition pieces. It is something.

Hereinafter, this invention will be described using a plastic sheet as a material.
A detailed explanation will be given based on an example using high frequency wells.

- First, unit (A) will be explained. unit(
A) is a rectangular partition piece (4) as shown in Figure 4.
Gusset-forming pieces (3) are provided on the outer edges of three sides excluding one side that becomes the opening. This unit) (A) is formed by cutting or cutting out a single sheet, or by a known method, separately from the partition pieces (4).
Three gusset forming pieces (3) formed in a band shape are bonded to the outer edge of the partition piece using a high frequency well. Note that one gusset forming piece may be adhered to the outer edges of three sides of the partition piece to form a unit as a continuous gusset forming piece.

The outer edge of the gusset forming piece (3) of the above unit) (A) was placed on the support plate (lower surface plate) (1) of the high frequency well,
Align the adhesive surface (2') K of the mold (2) as shown in Figure 2, and place another unit (A) on the outer edge of this gusset forming piece (3)
/) overlap the outer edges of the partition pieces (4') (Figure 5).

Then, by lowering the pressure plate (5) with one mold attached and applying a high frequency voltage under pressure, the gusset forming piece (3) of the unit (A) and the partition piece (A') of the unit (A') are formed. 4 are glued together to form a bag (
P) can be done (Figure 6).

Furthermore, in order to manufacture a bag having a large number of gussets, in the above-mentioned process, the gusset forming piece (3') of unit (A') is bonded to the gusset forming piece (3') of unit (A'). Align the outer edge with the adhesive surface (2') of the mold (2), and overlap the outer edge of the unadhered partition strip (4") of unit (A") on this gusset forming piece (3'). (Fig. 7).
Thereafter, by repeating the same process an arbitrary number of times, a bag having a large number of gussets can be manufactured.

In this bag with multiple gussets, the gusset forming piece of the top unit is not bonded, but if necessary, the adhesive surface of the mold and the unbonded gusset forming piece are aligned, and this gusset forming piece ( 3
Partition piece (4) with no gusset forming piece provided on top of 1)
All you have to do is overlap them and glue them together.

In this case, the top and bottom partition pieces each serve as the cover of the bag (FIG. 8).

The mold used in the above-described embodiment is conveniently tall because the units bonded in the above-described steps are sequentially housed inside.

Further, the unit to be used is not limited to the above-mentioned unit (A) K, but may be one in which a single gusset forming piece is provided and continuous gusset forming pieces are provided on three sides of the outer edge of a rectangular partition piece. Furthermore, gusset forming pieces may be provided on the four sides of a rectangular partition piece or on the entire outer edge of a circular partition piece, and accordingly, molds with mouth-shaped or annular adhesive surfaces may be used. Good0 Incidentally, it is of course possible to similarly manufacture a bag having a plurality of gussets by using an external heating bonding machine such as a heat sealer instead of the high-frequency well.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing a conventional manufacturing method for a bag having only one gusset, FIG. 2 is a perspective view of a mold, and FIG. 3 is a perspective view of the product. 4 to 8 show examples of the present invention, FIG. 4 is a plan view of the unit, FIG. 5 is a cross-sectional model of the manufacturing method, and FIG. 6 is a perspective view of the product, a floor bag. It is. FIG. 7 is a cross-sectional view of a model showing a method of repeating the above-mentioned process, and FIG. 8 is a cross-sectional view of a model showing a method of gluing a partition piece that will become a cover to a bag. ... Mold 2' ... Adhesive surface 3 ... Gusset forming piece 4 ... Partition piece 5 ... Pressure plate A ... Unit P ... Bag agent Patent attorney Masaharu Yamagami

Claims (1)

[Claims] Using multiple units made of plastic sheets or films with gusset-forming pieces provided on the outer edge of the partition pieces, the adhesive surface of the mold is installed inside the monument or on the support plate of an external heat-adhesive machine.
- Overlap the outer edge of the partition piece of another unit on top of the gusset forming piece of the unit, align and adhere it, or further, in the above step, attach the gusset forming piece of the unit placed above to the adhesive surface of the mold. A method for producing a gusseted bag made of plastic sheet or film, characterized by repeating the step of overlapping and bonding the outer edges of unbonded partition pieces of the unit on top of each other an arbitrary number of times.