The working principle of PVC film mainly includes its manufacturing process and application characteristics.
Manufacturing process
PVC film is made by calendering or blow molding polyvinyl chloride resin with other modifiers. The specific steps are as follows:
Raw material preparation: Mix polyvinyl chloride resin with functional processing aids such as plasticizers, stabilizers, and lubricants.
Calendering film forming: The mixture is calendered into film through a calender to form a film of specified thickness.
Processing: The film can be cut and heat-sealed as needed to make various practical film products.
Application characteristics
PVC film has the following characteristics:
Thermal insulation and light transmittance: PVC film has good thermal insulation and light transmittance, and is suitable as an external covering material for greenhouses, sheds, and small and medium-sized sheds.
Flexibility and easy shaping: PVC film is soft and easy to shape, suitable for a variety of covering and packaging needs.
Heat resistance and weather resistance: PVC film tends to soften and relax at high temperatures, and becomes hard and brittle at low temperatures, and has poor weather resistance.
Environmental issues: PVC film cannot be degraded or burned, and is difficult to handle after use.