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Introduce several common films of hard box stretch film packaging machine
Hard box stretch film packaging machine, as its name implies, is a kind of equipment to make protective film for hard boxes to ensure the hygiene and cleanliness inside. It is widely used in food, medicine and other fields, bringing great convenience. Here are several common films for hard box stretch film packaging machine: polyester film is one of the commonly used barrier composite film substrates, but polyester film costs a lot, usually with a thickness of 12mm, and the outer material commonly used for cooking packaging has good printability.
Polyester film therefore polyethylene terephthalate as the material, the acceptance of the extrusion method into a thick sheet, and then by two-way stretching made of film material. It is a colorless, transparent, light film with excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature resistance and low temperature, chemical resistance, oil resistance, air tightness and good fragrance preservation.
Biaxially oriented polypropylene film biaxially oriented polypropylene film is formed by polypropylene particles by co-extrusion sheet, and then by the vertical and horizontal two biased stretching and made. Because the tensile molecular orientation, so the physical stability of the film, mechanical strength, air tightness is better, transparency and light is high, strong wear-resistant is the current application of the printing film is very common, usually the application thickness of 20~40 m, the application of the general is 20 m.
The disadvantage of the tension of the two-way stretch polypropylene film is poor heat sealing, so it is usually used as the outer film of the composite film, such as moisture resistance, transparency, strength, stiffness and printability after being compounded with polyethylene film. It is ideal for containing dry food. Because the appearance of biaxially oriented polypropylene film is non-polar, high crystallinity, and low appearance free energy, its printing performance is poor, and its adhesion to ink and adhesive is poor. It is necessary to hold appearance treatment punishment before printing and compounding.
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