JPH027817Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tube for open bags.

This open bag is a synthetic resin bag with one side open for packaging various relatively small parts.It is usually a flat folded tube that is sealed at regular intervals at right angles to the longitudinal direction, with perforations in front or behind it. , and then using a machine to peel off only the perforations placed at regular intervals on one side of the folded tube, create a number of consecutive openings on one side of the tube.
This is stored in a roll form, and when necessary, it is rolled out, parts are placed in each opening, the openings are closed and sealed, and the perforations on the other side of the tube are peeled off to separate the parts into each part. I am making many bags containing . However, when opening only one side of a flattened tube using a machine, since there are perforations on the other side, both sides of the tube are often peeled off and the tube is cut at that point. With such an open bag, a long tube is created and the above operations are carried out on an automated production line, so cutting the tube becomes a major hindrance. Therefore, the current situation is to shorten the length of the tube in order to minimize the trouble when cutting the tube.

This idea was devised in view of this point, and it has an extremely simple structure, and when one side of the tube is opened by the machine mentioned above, the tube is not cut at that point, so a long tube can be used and mass production is possible. The purpose is to provide an open bag tube suitable for

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

1 is a tube made of synthetic resin, and this tube 1
Approximately half of the circular cross section is a thick wall portion 1a, and the other half is a thin wall portion 1b. 2 is a sealing part in which the thick part 1a and the thin part 1b of the tube 1 are overlapped, the tube 1 is folded flat, and the tube 1 is crossed at regular intervals in the longitudinal direction to seal both side surfaces of the tube; are perforations provided along the seal portion 2 on both sides of the lower tube 1 adjacent to the seal portion 2. With the thick part 1a of the tube 1 at the rear and the thin part 1b at the front, an appropriate machine is pressed under the perforation 3 on one side of the front part of the tube 1 and pulled down. As a result, only the perforation 3 at the thin wall portion 1b of the tube 1 is cut, and one side of the tube 1 is opened. As shown in FIG. 3, this is cut at every perforation 3 provided at regular intervals in the longitudinal direction of the tube 1 to form an opening 4. At this time, the thick portion 1a is provided with perforations 3 continuously in the same manner as the thin portion 1b, but the perforations 3 at these locations are not cut because the thick portion 1a is strong.

Therefore, the tube 1 maintains its long length and can be wound into a roll and stored. Then, extend the tube 1 when necessary, as shown in Figure 4.
Insert the parts 5 into each of the above openings, seal the openings 4, and pull more forcefully than during the opening operation, cut the perforations 3 in the thick part 1a, and complete the bag 6 in which the parts 5 are sealed. It is something.

Conventionally, the thickness of tube-shaped films has been standardized with an error of up to 2%, but this invention intentionally provides a difference in thickness that exceeds these standards. For example, when making a bag 6 with a width of 150 mm and a length of 200 mm, the thickness of the thin wall portion 1b is set to 45 μm, and the thickness of the thick wall portion 1a is set to 50 μm, but the opening portion 4 is formed as described above. There was no cutting of the thick part 1a, and the above effect was achieved.

Further, in the above embodiment, one front side of the tube 1 is a thin wall part 1b, and one rear side is a thick wall part 1a, so that when air is injected from the opening 4 to inflate it into a bag shape, the opening property is very good. Also, the seal part 2
Also, when sealing the opening 4, the thin wall portion 1b is attached to the thick wall portion 1a, resulting in a good-looking finish. Furthermore, by placing items in the bag 6 and placing the bag with the thick wall portion 1a facing down, the items inside can be more securely protected.

In the above embodiment, the cross section of the tube 1 is almost bisected along the longitudinal direction to form the thick wall portion 1a and the thin wall portion 1b, but the present invention is not limited to this. A belt-like thick portion may be provided in approximately half of the cross section. Further, the thick portion 1a in this invention is not limited to having a uniform thickness, but may have intermittent thick portions 7 as shown in FIG.
In this case, the thick part 7 is 20 to 50 times thicker than the other parts.
% or more is ideal.

In addition, this tube is not limited to one that is integrally molded, but can also be made by overlapping two film strips and pasting the ends together, or by sealing them to form a tube.
It includes a wide variety of tube-like shapes.

As described above, this idea is to fold the tube flat at least at the perforation point that crosses the tube and change the thickness of one side and the other side, so that the perforation on only one side can be peeled off. , long objects can be maintained without cutting up to the perforations on the other side, and when necessary, the other side can be cut by applying more force. Therefore, even when incorporated into a production line at a factory, etc., the reliability is high and the workability of parts packaging is extremely high.

[Brief explanation of drawings]

Fig. 1 is a front view of this device, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, Figs. 3 and 4 are perspective views showing the device in use, and Fig. 5 is a perspective view of this device. FIG. 7 is an enlarged cross-sectional view of a tube in another embodiment of the invention. In the figure, 1 is a tube, 1a is a thick part, 1b is a thin part, 2 is a seal part, 3 is a perforation, and 4 is an opening.

Claims (1)

[Scope of utility model registration request] A tube made of synthetic resin is folded flat, and sealing members are provided by fusion-bonding both sides of the tube across the tube at regular intervals in the longitudinal direction of the tube. Perforations are provided on both sides of the tube, and one side of the flat cross section of the tube facing each other at each perforation is a thick wall part, and the other side is a thin wall part that is thinner than the thick wall part. , tube for open back.