Broken hole blocking method for degradable plastic bag blow molding device

Abstract

The invention belongs to the technical field of plastic packaging bag production and processing, and particularly relates to a broken hole blocking method for a degradable plastic bag blow molding device. The device comprises an annular air curtain device and a sealing device which are arranged above a blow molding die head; the sealing device comprises two clamping plates located on the two sides of a cylindrical plastic film; the two clamping plates are each provided with a first hot sealing strip; the annular air curtain device is located between the blow molding die head and the sealing device; the air curtain device comprises an annular air outlet formed around the cylindrical plastic film; a valve is arranged between the annular air outlet and an air source; and when an air pressure sensor detects that instantaneous pressure loss occurs in the cylindrical plastic film, the valve is opened, so that a layer of cylindrical air curtain is formed around the cylindrical plastic film to prevent the cylindrical plastic film from collapsing and swinging. According to the invention, the annular air curtain device is adopted to guide and support a broken material, and meanwhile, the sealing device is utilized to block the broken area, so that the blow molding pressure in the material is ensured, the emergency treatment under the non-stop state of equipment is realized, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of plastic packaging bag production and processing, and in particular relates to a hole sealing method for a degradable plastic bag blow molding device. Background technique [0002] Plastic bags are generally processed and formed by blow molding. The general process is as follows: first, the plastic particles are heated and melted by a blow molding device and blown into a cylindrical plastic film, and then a horizontal ironing seam is hot pressed on the cylindrical plastic film, and finally Cutting the tubular plastic film from the hot seam with a cutting device to obtain a plastic bag monomer. During the blow molding process of plastic bags, once impurities are mixed into the molten plastic, it is easy to cause holes during blow molding, and the appearance of impurities is usually unavoidable, so the existing technology often has the phenomenon of film rupture in the blow molding process , when this happe...

AI Technical Summary

Problems solved by technology

During the blow molding process of plastic bags, once impurities are mixed into the molten plastic, it is easy to cause holes during blow molding, and the appearance of impurities is usually unavoidable, so the existing technology often has the phenomenon of film rupture in the blow molding process , when this happens, the prior art approach is: firstly control the shutdown of the blow molding device, then manually tear off the hole area from the film, then tie a knot on the film at the upper end of the blow molding device and restart the blow molding device and re-draws the film to the take-up position

This processing method requires the blow molding device to stop midway, so it cannot be connected in series with the downstream hot sealing and cutting devices, and it is difficult to realize continuous automatic production, which affects production efficiency

Images