Plastic film is a thin material made primarily from resins such as polyvinyl chloride (PVC), polyethylene (PE), and polypropylene (PP); it represents the most widely used form of flexible packaging. Key production processes include blown film extrusion, cast film extrusion, and biaxial stretching.
The primary production processes for plastic film include the blown film method, the cast film method, and the biaxial stretching method.
In the field of agricultural film, production equipment has evolved from calendering to blown film extrusion, and from single-layer structures to two-, three-, five-, and seven-layer configurations.
Cast film extrusion is one of the production processes; biodegradable starch/clay nanocomposite films are prepared using polymer melt processing technology.
Biaxial stretching is another production process; taking BOPP film as an example, production is primarily categorized into two methods: the tubular film process and the flat film process.