Plastic bag heat press device

Abstract

The invention discloses a hot pressing device for plastic bags. The hot pressing device is characterized in that a first heating module, a second heating module and a cooling module are sequentially mounted on the lower surface of a hot pressing rack along the axial direction of a production line, a circulating air pipe is arranged in the first heating module, one end of the circulating air pipe is connected with a connecting pipe, the other end of the circulating air pipe is connected with an air outlet pipe, the circulating air pipe is fixed in a heat exchanging block, a resistance heating plate is mounted on the lower surface of the second heating module and connected with a resistance heating power line, a row of axially-arranged semiconductor cold and hot plates is mounted in the cooling module, the cold ends of the semiconductor cold and hot plates face downwardly and contact with a heat transfer plate, the hot ends of the semiconductor cold and hot plates face upwardly and extend into an air cavity in the upper portion in the cooling module, one end of the air cavity is connected with an air inlet pipe, and the other end of the air cavity is connected with the connecting pipe.

Description

technical field [0001] The invention belongs to the technical field of making plastic packaging bags, and in particular relates to a plastic bag hot-pressing device. Background technique [0002] In the process of making plastic packaging bags, the plastic film needs to be folded into a long bag with upper and lower layers and two sides connected. This bag has the same width as the plastic bag, and the left and right ends of the plastic film extend to the plastic In the middle of the upper surface of the film, the left end of the plastic film is pressed against the right end of the plastic film to form an unembossed seam of the printed bag. This seam needs to be hot-pressed to make the two stick together, so that the packaging bag forms a ring state. , After hot pressing, the middle seam should be cooled in time to ensure that the middle seam will not be subjected to shear force during the cooling period and cause adhesion failure. The current technology uses natural air coo...

AI Technical Summary

Problems solved by technology

[0002] In the process of making plastic packaging bags, the plastic film needs to be folded into a long bag with upper and lower layers and two sides connected. This bag has the same width as the plastic bag, and the left and right ends of the plastic film extend to the plastic In the middle of the upper surface of the film, the left end of the plastic film is pressed against the right end of the plastic film to form an unembossed seam of the printed bag. This seam needs to be hot-pressed to make the two stick together, so that the packaging bag forms a ring state. After hot pressing, the middle seam should be cooled in time to ensure that the middle seam will not be subjected to shear force during the cooling period and cause adhesion failure. The current technology uses natural air cooling, which is relatively slow and the effect is poor.

In addition, direct heat pressing on the seam of the printed bag will cause the printed bag to wrinkle and have a bad appearance

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