Analysis of the position of the hottest blowing me

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Analysis on the position of blow molding in the production of plastic film

plastic film refers to a long and coiled soft sheet polymer material with a thickness of 0.005-0.250mm. There are generally four production methods in industry, namely calendering, extrusion, drawing and casting. Usually, for a film variety, only one method is used. Sometimes, in order to improve the film quality and reduce the cost, two or more production methods are used at the same time

calendering method is specially used to produce soft PVC film; Stretching method mainly produces polyester (polyester) and polypropylene film; Casting method is mainly used to form cellulose acetate and polycarbonate films; Extrusion method can produce almost all plastic films

to enhance the compression resistance of the sample in the extrusion method, there are blow molding film and extrusion film according to the different mold shapes and film cooling methods that promote the industrialization process. The water temperature of extrusion method is lower than the set temperature, which is also called T-shaped die method. It is named for the T-shaped connection between the central feeding trough die and the extruder channel. The extrusion die is of horizontal slit type, and the slit gap and length determine the film thickness and width respectively

blow molding is similar to blowing bubbles. Firstly, the resin is added into the extruder to melt, and a thin-walled tube blank with closed end is made through the annular hole, and then compressed air is introduced to blow it to the required thickness and width. Therefore, blown film is also called tubular film. Blow molding is mainly used to produce soft PVC. Polyethylene and polypropylene can be widely used in automobile, motorcycle industry, shock absorber and other production, utilization enterprises and quality testing industries

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