Common methods and characteristics of film production?

There are two types of production methods for plastic films (thickness between 0.005mm and 0.250mm) in industry——Calendering method and extrusion method, in which extrusion method is divided into extrusion blow molding, extrusion stretching and extrusion casting. The most widely used production processes are extrusion blow molding, extrusion stretching and extrusion casting, especially for polyolefin films, while calendering is mainly used for the production of some polyvinyl chloride films. In extrusion blow molding, extrusion stretching and extrusion casting, due to the continuous improvement of the overall manufacturing technology of extrusion blow molding equipment and the much lower increase. However, extrusion stretching equipment is still widely used in the production of various biaxially oriented films of high quality. With the increasing requirements for plastic film packaging for food, vegetables, fruits, etc., as well as the high performance requirements of agricultural film and shed film, and the increasing application of industrial films, as well as the application of computer and automation technology, plastic film equipment manufacturers have been Continuous innovation to improve the production quality of thin films.
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