In order to meet the needs for some special functions of plastic film packaging materials in the production process, a variety of characteristic materials (such as breathable, waterproof, thermal insulation, toughness, etc.) are blown and co extruded together to form a multi-functional plastic film, and a multi-layer co extrusion film blower is developed. The purpose of multi-layer co extrusion film blowing machine is to give play to the advantages of multiple materials and avoid some disadvantages of single material or single layer film blowing machine.
For example, the co extrusion film blowing machine for PP and PE makes use of the high hardness of PP material and the high brightness of PE material to produce a film that combines the two characteristics.
Multilayer coextrusion blowers are also divided into the following categories, such as two-layer coextrusion blowers, three-layer coextrusion blowers, five layer coextrusion blowers, and seven layer coextrusion blowers
Three layer co extrusion
The three-layer co extrusion and thin blowing production line adopts advanced technologies such as new efficient and low energy consumption extrusion unit, IBC film bubble internal cooling system, ± 360 ° horizontal upper traction rotation system, photoelectric automatic correction device, full-automatic winding and film tension control, computer screen automatic control system, etc. Compared with similar equipment, it has the advantages of higher output, good product plasticization, low energy consumption, and simple operation. It completely solves the problems of film ruffles and reeling heads, and brings the product quality to a new level. The film produced has the advantages of high transparency, puncture resistance, high toughness, good low temperature heat cutting property, good composite fastness and anti crimp property. The film can be widely used for light and heavy packaging due to its good barrier property, freshness preservation, moisture resistance, frost resistance, oxygen isolation and oil resistance. Such as various fresh fruits, meat products, pickles, fresh milk, liquid drinks, medical supplies, etc.
Five layer co extrusion
The five layer co extrusion film blowing unit is mainly applicable to HDPE, MHDPE, LDPE, LLDPE, MLLDPE, PA, EVOH and other resins with gas barrier properties. The film produced is mainly used for packaging materials such as heavy packaging, high-end food bags, vacuum packaging bags, liquid packaging bags, etc., to achieve the purpose of fragrance preservation, preservation, anti-corrosion, airtight, and extended shelf life.