JPH0132104B2 - - Google Patents

Description

Detailed Description of the Invention: In a synthetic resin carrier bag with a two-ply synthetic resin handle attached, the two-ply synthetic resin handle is heat-fused to the bag opening of the resin bag material during the bag manufacturing process. There is a prior art technique disclosed in Japanese Patent No. 1011067 (Japanese Patent Publication No. 54-25468) for manufacturing the above-mentioned carrier bag by attaching the bag material and heat-sealing the periphery of the bag material at the same time.

However, this patented invention involves mechanically transporting a U-shaped two-ply synthetic resin handle that has been folded and produced by an automatic handle manufacturing device to the bag opening of a long synthetic resin bag material that is being transported. At the same time as bag manufacturing using heat-sealed cut bag material, a two-layered handle is used as a means of heat-sealing only the bag opening without the two handles being fused to each other during heat-sealing to the bag opening. This is the process of forming a non-fusion layer, such as printing or other electrical pre-treatment, on the entire contact surface of the fused parts at both ends of the handle so that they do not fuse to each other. The process of forming the adhesive layer is such that, when simultaneously heat-sealing the two stacked handles to the bag opening, they are fused only to the bag material side without being fused to each other. Therefore, it is essential for the U-shaped two-ply synthetic resin pattern manufactured by automatic pattern manufacturing equipment to be pretreated with a non-bonding layer. However, there is a drawback that the number of steps increases and it is difficult to complete, and that a non-fusion layer material is required, which increases the cost of the pattern. In addition to the above-mentioned patented device, the straps are manufactured using various appropriate manufacturing devices, and the polymerized straps are fused to the long bag material being transported. As for the method of heat-sealing to avoid adhesion, it is necessary to use a non-fusing pretreatment method as described above, and all of the heat-sealing is performed by pressing with a simple flat hot press mold. As a result of the welding on one side, the shimashiri pattern is fused on one side, requiring a long fusion time.In order to achieve short fusion bonding, it is necessary to use a high-temperature press. In terms of strength, the bonding surface becomes extremely hard and the strength of the border becomes weak, and if tears or peeling occur at the border due to the weight of the bag containing the contents, etc., this will easily propagate and the handle will easily come off. There is great concern about this.

The method of the present invention reliably eliminates the disadvantages of conventional planar welding, which has poor strength, by thermally fusing two-ply synthetic resin handles, and by using a heat fusing method with high weight-bearing strength, it is durable and inexpensive. The object of the present invention is to provide a synthetic resin carrier bag with a two-layered handle.

The attachment method of the present invention involves folding and transporting a thick U-shaped two-ply synthetic resin handle using an appropriate automatic handle manufacturing and conveying device, without applying non-fusion treatment to the contact surfaces of each other. Transfer: On the inner surface of the bag opening of each bag body manufactured by heat-sealing and cutting a long synthetic resin bag material, uneven tooth shapes are arranged in a ring line such as a circular ring line in a vertically opposing engagement or a non-opposing alternating engagement. This method is characterized by hot-pressing with a pair of upper and lower tooth-shaped heat press molds and heat-sealing and attaching them to the intermittent tooth mold of the ring line, and examples thereof will be explained with reference to drawings. Then, it looks like this:

First example.

As shown in Figures 1 to 3, a hot mold for heat-sealing the two-ply synthetic resin handles 7, 7' to the inner surface of the synthetic resin bag material 2 is placed at the required intervals at the required intervals. A pair of upper and lower tooth type hot press molds 6, 6' in which concave teeth 4, 4' and convex teeth 5, 5' of different sizes are arranged alternately in a circular line, and the upper and lower tooth molds are in mutually opposing meshing. Then, using the molds 6 and 6', the long synthetic resin bag material 2 is folded and transported in a two-layered manner on the inside of the bag mouth using an appropriate automatic pattern manufacturing and transporting device. Both ends of the U-shaped thick two-ply synthetic resin handles 7, 7' whose contact surfaces are not fused are placed in contact with each other, and the bag is At the same time as the cut manufacturing process that involves heat sealing the periphery of the material 2, heat pressing is performed, and the fused parts of the front and back handles of the completed synthetic resin bag P are formed with upper and lower opposing tooth patterns and at the same time an intermittent tooth pattern on the cylindrical line. This method is characterized in that the pedestals 7, 7' are attached by heat-sealing 8, 8'.

Second example.

As shown in FIGS. 4 and 5, the tooth shapes of the mold in the first embodiment are made so that the upper and lower portions are not opposed to each other and are alternately engaged, so that a pair of upper and lower tooth-shaped hot press molds 3, 3'
and using the molds 3 and 3', heat the intermittent tooth type in the cylindrical line to the fused parts of the front and back handles of the completed synthetic resin bag P in the same manner as in the first embodiment. Two-ply synthetic resin pedestal 7 under fusion bonding 8, 8'
7'.

In both the first and second embodiments, the convex teeth 5, 5' of the molds 6, 6' and 3, 3' may be pointed teeth or claw-shaped teeth instead of flat teeth.

Furthermore, since it is advantageous for the propagation of heat to be as slow as possible, a slightly thicker resin film is used for the thickness of the handles 7, 7', and the thickness may vary depending on conditions such as pressing force or fusion temperature. Major, but not limited to
A thickness of about 100μ-300μ is suitable.

In addition, the attachment of the handles 7, 7' to the bag opening is as follows:
Although the main object is to attach it to the inside, it can also be applied to the outside if it is fused by the intermittent tooth type of the method of the present invention.

As a dependent invention of the above method, the thick U-shaped handle 7,
7' is attached to a ring line such as a cylindrical ring by intermittent tooth type heat fusion bonding 8, 8'.

In the figure, numerals 9 and 9' indicate intermittent space portions for the intermittent tooth type heat sealing 8 and 8.

Since the method of the present invention is as in the above example,
To fuse and attach the thick handles 7 and 7' to the bag opening of the synthetic resin bag material 2 that is being transferred, a heat press mold for heat-sealing the bag is attached to a ring line such as a ring line. By hot pressing using a pair of upper and lower molds in which the concave and convex tooth shapes 4, 4', 5, and 5' are formed in an array of upper and lower opposing meshes or non-opposing alternating meshes, the fusion is achieved by the tooth shape press. This results in intermittent tooth type heat fusion bonding 8, 8'.

This tooth-shaped heat fusion bonding 8, 8' differs from the conventional full-plane fusion bonding in that the fusion width is narrower than that, and the presence of intermittent voids 9, 9' and the thick film of the handle material. Since the conditions are correlated, short-time fusion is possible at low heat, and heat propagation is therefore slow, the contact surfaces of the pedestals 7 and 7' are not subjected to non-fusion pretreatment. Even if it is a completely normal thermoplastic material,
Even with simultaneous heat press processing from the front and back sides, the handle 7,
7' can be attached to the bag P without any fusion occurring.

The heat welded part is a fine intermittent tooth type heat weld 8, 8' related to the ring line, so it can be fused instantly even with a low heat press, and it will not harden unnecessarily. The fused part is very strong and difficult to break, and the existence of the intermittent spaces 9 and 9' prevents damage even if damage occurs at the boundary between the heat fused parts 8 and 8'.
The propagation is stopped at the adjacent fused portion, and together with the strength of the heat fused bond 8, 8' in the ring line, it is rich in weight resistance and durability, and the pedestal 7,
7' requires no non-fusion processing at all, and can simply use the material of the shank 7, 7', resulting in cost reductions as manufacturing time and pre-treatment can be omitted. Therefore, it is very economically convenient.

Note that heat propagation can be slowed down by using a suitably thick material for the shank 7, 7'. Furthermore, in the mounting method of the second embodiment, the heat-sealed portions 8, 8' are not pressed between the upper and lower teeth, and are performed between the concave teeth 4, 4', which further reduces heat propagation. This is effective because it becomes slower and lower (relative to the opposing side).

In addition, in the method of the present invention, compared to conventional flat molds, the bag surface of the tooth-shaped mold is embedded in the part where the handle is bonded, so that part is strong, and the front and back sides of each left and right end are Simultaneous heat welding of four locations with a flat mold has a large bonding surface, resulting in large positional deviations due to thermal expansion of the bag surface, whereas welding with an intermittent tooth mold requires a smaller press area. Thermal expansion is small and even pressure bonding is possible, so no bonding defects occur at all.Furthermore, with flat molds, the bonding surface becomes thinner and weaker due to heat-induced hardening changes, and there are defects that can easily be removed. Tooth mold bonding has a significant difference in that this does not occur and the bonding surface does not become thin, making it more durable.

Therefore, in the synthetic resin carrier bag in which the two-ply synthetic resin handles 7, 7' are attached by tooth-shaped fusion in the fine ring lines by the method of the present invention, the attachment part of the handle is strong, and therefore has a high weight capacity. It is highly durable, and in addition, the tooth-shaped fused form of the fine ring line has a fashion-like beauty and is very stylish, so it is in high demand.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; Fig. 1 is a bottom view of the upper tooth-shaped hot press mold used in the method of the present invention, and Fig. 2 is a diagram showing the mold according to the first embodiment of the method of the present invention. Partial cross-sectional conceptual diagram showing the start of pressing,
Fig. 3 is a partially enlarged cross-sectional view showing the hot press state of the same as above, Fig. 4 is a partially cross-sectional conceptual view showing the start of pressing by the press die of the second embodiment of the method of the present invention, and Fig. 5 is the same as above. 6 is a perspective view of the carrier bag of the present invention, FIG. 7 is an enlarged side sectional view of the handle attachment part, and Figure 8 is a part of the handle attachment part. It is an enlarged front view. 4, 4'...Concave tooth, 5,5'...Convex tooth, 3,3',
6, 6'...Tooth-shaped hot press mold, 7, 7'...Two-ply synthetic resin handle, 8, 8'...Intermittent tooth type heat fusion, P...Synthetic resin bag body.

Claims (1)

[Scope of Claims] 1. A thick U-shaped two-ply synthetic resin pedestal that is folded and transported by an appropriate automatic pedestal production and conveyance device, without applying non-fusion treatment to the contact surfaces of each other, Transfer: On the inner surface of the bag opening of each bag body manufactured by heat-sealing and cutting a long synthetic resin bag material, uneven tooth shapes are arranged in a ring line such as a circular ring line in a vertically opposing engagement or a non-opposing alternating engagement. Attachment of a two-ply synthetic resin handle to a synthetic resin carrying bag, characterized in that it is attached by heat-sealing with a pair of upper and lower tooth-shaped heat press molds and then heat-sealed to the intermittent tooth mold of the ring line. Method. 2 Thick U-shaped two-ply synthetic resin handles 7, 7' are heat-sealed with intermittent teeth 8, 8 to the bag opening of the synthetic resin bag P along the ring line such as a circular ring. ′
A synthetic resin carrier bag characterized by being attached in a shape.