Questions about PVC film

1. What is PVC calendered film?

2. What is the difference between PVC blown film and cast film? In which fields are they applied?

3. What is the difference between a soft PVC film and a hard one? Are foods usually soft or hard?

4. Is the biaxially stretched PVC film a blown film or a cast film?


1. Calendering is through the gap between two or more rotating drums, and the shearing force between the drums allows the material to be squeezed multiple times. It is simple and the material is fully kneaded. It is a continuous film-like (sheet-like) product extended to a predetermined size. Calendering is the main molding method for soft PVC. For soft PVC products, tail films with a thickness of less than 0.25mm and sheets with a thickness between 0.25 and 1mm are thin.

2. The blow molding method is an important production method for general packaging films. Early production of soft PVC films, and later development of rigid food packaging PVC films. Ordinary shrink films are also produced by this method after biaxial stretching.

The flat film method is also one of the methods for producing cast film and stretch film (self-adhesive film). Since the price of the equipment is higher than that of general film blowing equipment, it is used less. In addition, according to its special purpose, it adopts special formula and process to produce, such as unidirectional stretch film, medical film, cold-resistant film and other manufacturing methods. Polyvinyl chloride composite film made by the composite method is much less than polyethylene and polypropylene composite film.

3. The properties of soft and rigid PVC films are slightly different, but they all have one thing in common, that is, transparency and printing adaptability are good, and they have a common disadvantage, that is, heat resistance and poor cold resistance.

For rigid PVC film, it can be used as a protective container for packaging fruit, an egg protective container, a confectionery tray, etc., with its transparency, easy processing, and cheap price. It can also be used as a film forming container. For soft PVC film, make use of its softness, processing type, in the medical field, make catheters, infusion bags, etc. The self-adhesiveness of stretch film is used for packaging of fruits, meat, fish and shellfish. Among rigid PVC films, heat-shrinkable PVC films with heat-shrinkable models due to stretching, shrink labels for glass bottles or plastic bottles, and shrink films on the outer layer of bottle caps. Aspect of use. With its large shrinkage rate, it can obtain uniform and beautiful shrinkage effect on the bottleneck part with different diameters. Cylindrical shrink labels for chemicals such as bleaching agents, which take advantage of their chemical resistance

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