Production method of plastic packaging bags

Abstract

The invention discloses a production method of plastic packaging bags and belongs to the technical field of plastic bag production. The production method of the plastic packaging bags is characterizedby including the following steps that reshaping is performed, wherein a reshaping roller is adopted to reshape a plastic film, and the plastic film after being reshaped is cropped, the plastic film after being cropped is pulled and the two sides of the plastic film are made to coincide with each other by depending on molds on the two sides, and a cylindrical shape is formed; middle sealing is performed, wherein the plastic film is pulled at the speed of 40-120 m/min, hot air is blown to the coinciding portion of the plastic film, middle sealing of the plastic film is completed, a plastic cylinder is formed, the temperature of the hot air is 118-192 DEG C, and the air pressure of the hot air is 0.2-0.4 MPa; and bottom sealing is performed, wherein the plastic cylinder is subjected to transverse heat sealing and is cut off, and the plastic bags are formed. According to the production method of the plastic packaging bags, middle sealing is performed in the manner of thermal radiation, heat sealing on the plastic film can be achieved in the pulling process of the plastic film, and therefore the heat sealing speed of the plastic film is increased, and the production speed of the plastic bags is greatly improved.

Description

technical field [0001] The invention discloses a production method of a plastic packaging bag, which belongs to the technical field of plastic bag production. Background technique [0002] Plastic bags are bags made of plastic (commonly used plastics include polyethylene, polypropylene, polyester, nylon, etc.) as the main raw material. They are indispensable items in people's daily life and are often used to hold other items. In the production process of the existing plastic bags, both sides of the plastic film need to be heat-sealed to form a plastic tube, and the plastic tube is cut off and the ends are sealed to form a plastic bag. The existing heat-sealing device is a contact-type heat-sealing device, which needs to be in contact with the plastic film to achieve heat-sealing, which causes the plastic film to stop pulling during the heat-sealing process, and the plastic film can be pulled again after the heat-sealing is completed , the traction movement of the plastic fi...

AI Technical Summary

Problems solved by technology

The existing heat-sealing device is a contact-type heat-sealing device, which needs to be in contact with the plastic film to achieve heat-sealing, which causes the plastic film to stop pulling during the heat-sealing process, and the plastic film can be pulled again after the heat-sealing is completed , the traction movement of the plastic film during the heat sealing process is not continuous, which greatly reduces the speed of heat sealing, and the extrusion of the plastic bag during the heat sealing process will cause deformation of the plastic film or wrinkles on the plastic film, affecting the plastic shape of the bag

In addition, if the traction and heat sealing of the plastic film are inaccurate when the heat sealing equipment is in use, the problem of tearing the plastic film will occur, resulting in damage to the plastic film

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