Zipper tape, packaging bag with zipper tape, method for producing packaging bag with zipper tape and production device therefor

Abstract

The invention provides a zipper tape, a packaging bag with the zipper tape, a method for producing the packaging bag with the zipper tape and a production device therefor. After engagement of a male belt-like member (21) and a female belt-like member (22) are disengaged, a void portion is formed by punching the female belt-like member (22) with a die (321). The female belt-like member (22) having the void portion and the male belt-like member (21) are re-engaged with each other and fed between a folded base material film (10) that is continuously fed. A male belt-like base and a female belt-like base are heat-sealed. A seal bar (82) heat-seals the base material film (10) to form a bottom seal portion. A side seal bar (84) heat-seals the base material film (10) to form side seal portions. The cutter (75) cuts the base material film (10) in the middle of the side seal portions to produce the packaging bag (1) in which three sides of the bottom seal portion and the side seal portions are heat-sealed.

Description

technical field [0001] The invention relates to a buckle belt, a packaging bag with the buckle belt, a manufacturing method and a manufacturing device for the packaging bag with the buckle belt. Background technique [0002] Packaging bags with buckle straps are used in many fields such as food, medical products and groceries. As the zipper belt, there is known a zipper belt composed of an engageable male member and a female member. [0003] And, when manufacturing such a packaging bag with a zipper tape, after the zipper tape is thermocompression-bonded, the packaging base film is thermo-compression-bonded in a direction perpendicular to the longitudinal direction of the zipper tape. bag. However, since the amount of resin in the occlusal portion of the zipper tape is larger than that of other portions, good thermocompression bonding may not be obtained at the portion where the packaging base film is thermocompression-bonded at the position of the zipper tape. Therefore,...

AI Technical Summary

Problems solved by technology

[0011] However, as described in Patent Documents 1 and 3, in the structure in which the engaging portion of the engaged zipper tape is removed in advance and the film is heat-sealed, since, for example, the lengths of the inner peripheral side and the outer peripheral side are different, Therefore, there is a possibility that the removal positions of the male side and the female side may be misaligned during the transport period from the removal of the seam to the feeding of the zipper tape into the film for heat sealing.

In addition, since the amount of resin required to form the male and female sides differs greatly, the male and female sides differ according to the tension applied in the lengthwise direction during the conveyance before the zipper tape is fed into the film for heat sealing. While extending by different amounts, the removal positions of the positive side and the negative side may be misaligned

As a result, positional misalignment gradually accumulates, and finally, the part where the seam is removed deviates from the position where the film is heat-sealed and cut, and it may not be possible to seal as a bag with snap tape.

[0012] On the other hand, in the structure in which the zipper tape is attached to the film and crushes the occlusal part as described in Patent Document 2, if the temperature is low, the occlusal part cannot be sufficiently crushed, and if the temperature is high, the film will Pinholes, etc. are generated, and the control of temperature setting and pressurized state is cumbersome

In addition, the crushed resin part is in a state of flowing to other places, so there may be problems such as poor sealing and damage to the appearance caused by resin flowing out of the heat-sealed part of the film.

In particular, when the film has an aluminum layer structure, the aluminum layer in the crushed and sealed part is prone to cracks and other defects, so there is a problem that the application to packaging bags without the aluminum layer is limited.

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