JPS634786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a waterproof carrier bag with a double bottom.

[Conventional technology]

For example, attaching a bottom plate to a carrier bag made of a sheet of synthetic resin such as polyethylene is convenient because it can stand on its own even when storing soft objects. It was difficult to attach it firmly.

Therefore, the present applicant has devised a waterproof carrier bag that has a double bottom that ensures waterproofness by firmly attaching a bottom plate to the bottom of a synthetic resin carrier bag, and is currently filing a separate application for the same.

The carrying bag of the above-mentioned invention (hereinafter referred to as the "prior application") consists of a tube-shaped synthetic resin sheet that is sandwiched between two bottom plates at the lower end of the bag body and folded in, and the vicinity of the periphery of the two bottom plates is folded into the bag body. It has a structure in which they are thermally fused to each other via.

1 to 3 are explanatory diagrams of one embodiment of the carrier bag of the above-mentioned prior application, and 1 is a bag body made of a polyethylene tube. The bag body 1 may be a seamless tube, or may be a sheet formed into a tube shape by adhesive processing such as heat fusion.

As shown in Figure 1, the inner bottom plate 2 is positioned at a distance L from the lower end of the tube 1 that constitutes the bag body, and as shown in Figure 2, the lower end of the tube at the distance L is folded inward. , overlap another outer bottom plate 3 and sandwich the lower end (folded part) of the tube 1. 4 is a lanyard.

Next, as shown in FIG. 3, heat sealing 5 is applied to the portion where the lower end of the tube 1 is sandwiched between the bottom plate 2 and the bottom plate 3. 6 indicates a line where the bottom plate 2 and the bottom plate 3 are directly heat-sealed.

In order to carry out heat-sealing as described above, the inner sole plate 2 of the prior application is preliminarily laminated with polyethylene, and the outer sole plate 3 is made of a polyethylene sheet. In the present invention, a bottom plate treated with synthetic resin means a bottom plate impregnated with synthetic resin, a bottom plate coated with synthetic resin, a bottom plate made of a synthetic resin sheet, etc. In short, a bottom plate that can be heat-sealed to a mating member made of synthetic resin. This is a general term for the bottom plate configured as follows.

[Problems to be solved by the present invention]

The carrier bag according to the prior application constructed as described above is very convenient as it is water resistant and can stand on its own while storing soft items, but the workability of the manufacturing process is as follows: There is a problem like this.

That is, in the process of processing from the state shown in FIG. 1 to the state shown in FIG. 2, it is very time-consuming to align the bottom end of the synthetic resin tube 1 with dimension L, fold it inward, and bring it into close contact with the bottom plate 2. It takes a lot of time, and efficiency cannot be improved even by skilled workers.

The present invention was made in view of the above circumstances, and
The lower end of the bag body made of a tube-shaped synthetic resin sheet is sandwiched and folded between two bottom plates, and the two bottom plates are heat-sealed together through the bag body to quickly create a carrier bag. It is an object of the present invention to provide a manufacturing method that can be easily configured and is particularly suitable for automating or semi-automating the folding operation, which conventionally required the most labor.

[Means for solving problems]

In order to achieve the above object, the manufacturing method of the present invention comprises: (a) folding the lower end of a tubular synthetic resin sheet in an aligned state; (b) fastening the folded portion to form a bag shape; (c) Insert the synthetic resin-treated inner bottom plate into the bag-shaped synthetic resin sheet, and (d) overlap the bottom of the bag-shaped sheet and the inner bottom plate and heat-seal the periphery of the fastening point to attach the fastening part. (e) Overlay another synthetic resin-treated outer bottom plate on the burnt-out part, (f) Place the inner and outer bottom plates through the synthetic resin sheet folded part. heat fused to each other.

[Effect]

In the conventional technology, it took a lot of time and effort to process the state from the state shown in Fig. 1 to the state shown in Fig. 2, but according to the above structure, the tube was removed in the steps (a) and (b). (However, the lower end refers to the lower end of the finished product when in use.
In the middle of the work, the distinction between upper and lower cannot be recognized), the inner bottom plate is inserted in step (c), and the tightened points (fastening points) are burned out in step (d), so the second
Folding as shown in the figure can be done quickly and easily, and the inner bottom plate can be heat-sealed at the same time.

This solves the problem of the difficulty in folding the lower end of the tube (the portion of dimension L shown in FIG. 2), which had been a problem in the manufacturing method of the prior art.

Furthermore, by attaching the outer bottom plate in steps (e) and (f), a strong and completely watertight carrier bag can be easily constructed.

〔Example〕

Next, one embodiment of the present invention will be described with reference to FIGS. 4 to 7.

As shown in FIG. 4, the lower end portion 1a of the tube 1 is folded into an aligned state. In this example, the bag was folded using a pouch, which is widely used to close the mouth of a confectionery bag. When the method of the present invention is carried out, a known packer can be used to perform the folding operation automatically and with high efficiency.

In the present invention, "folding in an aligned state" means
It literally means "to fold in regular order."

The tube 1 of this embodiment was formed by heat-sealing a polyethylene sheet and forming it into a tube shape.
1b is a heat fusion wire.

In this embodiment, as described above, the lower end portion 1a is folded using a packer, so that the lower end portion 1a is automatically bound with the wire 5 (packed with vinyl) at the same time as the folding.

When carrying out the present invention, good results can be obtained by binding the folded portions using filaments such as wire as in this example, but the folded portions may be fastened using any means such as heat fusion. You can also attach it. The point is that the folded state of the lower end portion 1a may be temporarily maintained during the processing process.

By folding and fastening as described above, the bottom of the tube 1 is closed to form a bag-like shape (FIG. 4).

An inner bottom plate 2 treated with a synthetic resin is inserted into a bag-shaped tube 1.

When the inner bottom plate 2 is pressed against the bottom of the bag-shaped tube 1 and the shape is adjusted, it becomes as shown in Fig. 5. In this state, the periphery of the folded and fastened end 1a is heat-sealed along the circle 6 to fix the tube 1 to the inner bottom plate 2.

When carrying out the present invention, the periphery of the fastening part does not necessarily have to be heat-sealed along the circle 6, but the work is easier if it is heat-sealed concentrically with the inner bottom plate 2.

Next, as shown in FIG. 6, the tube 1 is cut along the inside of the heat-sealed line (circle 6 in this example), and the fixed lower end 1b is removed.
If this cutting operation is performed simultaneously with the heat fusion described above and burned out (fused), the operation is easy and can be carried out quickly.

FIG. 6 shows the state in which the lower end of the tube 1 has been burned off and removed. The state shown in FIG. 6 corresponds to the state shown in FIG. ) is folded inward without any trouble and is fixed to the inner bottom plate 2 along the circle 6, making it easy to handle.

In this state, the synthetic resin-treated outer sole plate 3 is stacked on the lower surface (see FIG. 7) and heated along its periphery to fuse the inner sole plate 2 and the outer sole plate 3 to each other via the tube 1. The diameter of the outer sole plate 3 is set to be the same or smaller than the diameter of the inner sole plate 2, and larger than the circle 6. This results in
The lower end of the tube 1 and the outer sole plate 3 are closely joined to ensure waterproofness.

〔Effect of the invention〕

As detailed above, according to the manufacturing method of the present invention, the lower end of the bag body made of a tube-shaped synthetic resin sheet is sandwiched and folded between the two inner and outer bottom plates. A carrier bag having a structure in which the periphery of the bottom plate is heat-sealed to each other through the bag body can be quickly and easily manufactured.In particular, a well-known packer can be used to fold the bottom end of the tube along the periphery of the inner bottom plate. It can be applied and constructed with high efficiency.

[Brief explanation of the drawing]

Figures 1 to 3 are structural explanatory diagrams of a waterproof carrier bag with a double bottom to be manufactured by the method of the present invention, where Figure 1 is an exploded perspective view and Figure 2 is a partially exploded perspective view. , FIG. 3 is a perspective view of the assembled state. Fourth
7 to 7 are perspective views depicting the manufacturing method of the present invention in the order of steps. 1...Synthetic resin tube to be formed into the bag body, 1a...Lower end folded in an aligned state, 1b
... Fusion wire, 2 ... Inner bottom plate treated with synthetic resin, 3
...Same outer bottom plate, 5...Wire for lower end fastening,
6...A circle indicating a fusion line.

Claims (1)

[Scope of Claims] 1. The lower end of the bag body made of a tube-shaped synthetic resin sheet is sandwiched and folded between two bottom plates, the inner and the outer, and the vicinity of the periphery of the two bottom plates is inserted through the bag body. A method for manufacturing a carrier bag that is heat-fused to each other, comprising: (a) folding the lower ends of tubular synthetic resin sheets in an aligned state, (b) fastening the folded parts to form a bag shape, and (c) folding the tubular synthetic resin sheets into a bag shape. Insert the synthetic resin-treated inner bottom plate into the bag-shaped synthetic resin sheet, and (d) overlap the bottom of the bag-shaped sheet and the inner bottom plate and heat-seal the periphery of the fastening point to attach the fastening part. (e) Overlay another synthetic resin-treated outer bottom plate on the burnt-out part, (f) Place the inner and outer bottom plates through the synthetic resin sheet folded part. A method for manufacturing a waterproof carrier bag with a double bottom that is heat-fused to each other.