Polypropylene cast film (CPP) is widely used. CPP is a non-stretch, non-oriented cast film produced by melt casting quenching. Compared with blown film, it is characterized by fast production speed, high output, and good film transparency, gloss and thickness uniformity. At the same time, because it is a flat extrusion film, the subsequent processes such as printing and lamination are extremely convenient, so it is widely used in the packaging of textiles, flowers, food, and daily necessities.
There are two ways to produce CPP: single-layer casting and multi-layer co-extrusion casting. The single-layer film mainly requires the material to have good low temperature heat sealing performance and flexibility. Multi-layer co-extrusion cast film can generally be divided into three layers: heat sealing layer, support layer and corona layer. The choice of material is wider than that of single-layer film. Materials that meet the requirements of each layer can be selected individually to give the film different characteristics, function and purpose. Among them, the heat-sealing layer needs to be heat-sealed, which requires the material to have a low melting point, good hot-melt, wide heat-sealing temperature, and easy sealing: the support layer supports the film and increases the stiffness of the film. The corona layer needs to be printed or metallized, which requires a moderate surface tension, and the addition of additives should be strictly limited.
CPP cast film has excellent heat sealing performance and excellent transparency, and is one of the main packaging composite substrates. It is used to produce high-temperature cooking films, vacuum aluminized films, etc. The market is extremely optimistic.
Post time: Mar-09-2022