Cast film is a kind of non-stretched, non-oriented flat extrusion film produced by melt casting and quenching. There are two ways of single layer salivation and multi-layer co-extrusion salivation. Compared with blown film, it is characterized by fast production speed, high output, excellent film transparency, gloss, thickness uniformity, etc. At the same time, because it is a flat-extrusion film, the subsequent processes such as printing and lamination are extremely convenient. Therefore, it is widely used in packaging of textiles, flowers, food and daily necessities.
CPP production has two methods: 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-extruded cast film can generally be divided into three layers: heat seal layer, support layer, and corona layer. The choice of material is wider than single layer film. The materials that meet the requirements of each layer can be selected individually, giving the film different Functions and uses. Among them, the heat-sealing layer needs to be heat-sealed, the melting point of the material is low, the heat-melt property is good, the heat-sealing temperature is wide, and the sealing is easy; the support layer supports the film and increases the stiffness of the film; corona The layer needs to be printed or metallized, and moderate surface tension is required. The addition of additives should be strictly limited.
Post time: Jan-14-2021
