JPS6146121B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic bag formed from a plastic film, the plastic bag having an open end in which a channel having at least one opening is formed. A plastic tape is disposed in the channel and can be pulled out through the opening when carrying the plastic bag of the invention.

The invention also relates to a method of manufacturing the above plastic bag.

British Patent No. 1125363 describes a plastic bag comprising a plurality of plastic tapes disposed in a plurality of channels formed along the periphery of the opening of the plastic bag. ing. Both ends of the above plastic tape are
The plastic tape is welded to the two edges of the plastic bag, thereby holding the plastic tape at the two edges of the plastic bag. In the conventional bag having the above-mentioned structure, the load caused by the contents stored in the plastic bag is completely absorbed by the load caused by the contents stored in the plastic bag.
It has the disadvantage that it acts on the welded parts of the two edges. Therefore, conventional bags become useless after one or a few uses.

The present invention was made based on the above-mentioned circumstances, and it is an object of the present invention to provide a plastic bag that has a stronger structure than conventional bags and is easier to manufacture.

In the plastic bag of the present invention, a continuous channel is formed along the periphery of the open end of the plastic bag made of plastic film, and an endless ring shape is formed in this channel. A plastic tape, formed from a single piece without any seams, is wrapped around the plastic tape so that it can move freely within the channel.

The endless ring-shaped plastic tape mentioned above is made of a single piece without any seams, which eliminates the problem of welding, which was the weak point of conventional bags. This allows the structure to be strengthened.

An embodiment of the present invention will be described below with reference to the drawings.

1 through 5, the process by which the plastic bag of the present invention is formed is shown step-by-step.

FIG. 1 shows a plastic bag forming part 1 whose two side edges 2, 2 and a bottom edge 3 are closed by welding.
It is shown. This plastic bag making section 1
is formed from two overlapping plastic films.

In FIG. 2, the formation of an opening, for example a grip hole 4, is shown. This grip hole 4 is formed by punching out the two plastic films mentioned above.

In FIG. 3, a plastic tape 5 formed in a ring shape from a single piece without any endless seams is shown extending from the bottom edge to the top edge 7 of the plastic bag making section 1, i.e. It is shown in the middle of being pulled up toward the open end as indicated by arrows A and A. A muscle pressing portion 6 is provided so as to cross the grip hole 4.

FIG. 4 shows the plastic tape 5 pulled up to the above-mentioned striped pusher 6, and this plastic tape 5 is folded back outward at the striped pusher 6 into the plastic bag making section 1. covered by the upper edge of

FIG. 5 shows a welded part 8 formed by fixing, for example welding, the upper edge 7 of the folded upper edge of the plastic bag making part 1. A channel 9 is formed at the periphery of the open end of the section 1, and a plastic tape 5 is wrapped around the channel 9. The plastic tape 5 can move freely within the channel 9 along the direction in which the channel 9 extends.

To use the plastic bag of the present invention produced by the process described above, grasp the portion of the plastic tape 5 that is exposed in the grip hole 4 and lift the plastic bag of the present invention. If something that causes a load is stored in the plastic bag making section 1, the plastic tape 5 is pulled out from the grip hole 4,
The channel 9 of the plastic bag making section 1 becomes pleated.

Note that the grip hole 4 may be provided only on one side of the plastic bag making section 1.

Furthermore, the plastic tape 5 is preferably made of polyethylene.

[Brief explanation of the drawing]

FIGS. 1 to 5 show step by step the process of forming an embodiment of the present invention.
The figure is a front view showing a plastic bag-forming part with two side edges and bottom edges welded together, and Figure 2 is a state in which a grip hole is formed near the upper edge of the plastic bag-forming part shown in Figure 1. FIG. 3 is a front view showing the endless ring-shaped plastic tape being wrapped around the plastic bag making section shown in FIG. 2, and FIG. FIG. 5 is a front view showing a state in which the upper edge of the plastic bag-making part is folded back outward and covered with plastic tape. FIG. 3 is a front view showing a complete state of an embodiment of the present invention in which the upper edges of the upper edges are welded to form a channel; 1...Plastic bag making part, 2...Side edge, 3
...Bottom edge, 4...Grip hole, 5...Plastic tape, 6...Stripe push part, 7...Top edge, 8...Welded part, 9...Channel, A...Arrow.

Claims (1)

[Scope of Claims] 1. A plastic bag-making part having an open end formed of a plastic film and having a channel having at least one opening;
a plastic tape disposed in the channel and pulled out from the opening when carried; the channel is formed continuously along the periphery of the opening end of the plastic bag-making section; A plastic bag characterized in that the plastic tape is formed of a single member in the shape of an endless ring without any seams, and is wrapped around the channel and can freely move within the channel. 2. The plastic bag according to claim 1, wherein the channel has one opening on each side of the plastic bag making section. 3. Two side edges and a bottom edge of the two polymerized plastic films are closed, and the upper edge is opened to form a plastic bag-making section, and the above plastic bag-making section is closed. At least one opening is formed in the plastic film near the upper edge, and the plastic bag is formed into an endless ring shape parallel to the upper edge of the plastic bag-forming portion at a position that partially crosses the opening. A plastic tape made of a single member without any seams is wrapped around the plastic bag making part, and the upper edge of the plastic bag making part is covered with the plastic tape. and fixing the folded upper edge on both sides of the plastic bag forming part to form a channel in which the plastic tape is covered and can move freely. A method of manufacturing plastic bags.