The biaxially stretched PE film is made of special LLDPE raw materials, which are stretched in the longitudinal direction and then in the transverse direction. Compared with the polyethylene film produced by the original blow molding or casting method, it has a greater improvement in physical properties, and its transparency is more High, heat-sealability, better moisture resistance, strong longitudinal and transverse tensile strength, and has the advantages of moisture resistance and foldability. Especially when the thickness is reduced by 50%, the key performance can still reach the performance of other polyethylene films.
Because the biaxially stretched PE is obtained by co-extruding polypropylene particles into a sheet, and then stretching in both vertical and horizontal directions. The stretched molecules are oriented, so the film has good physical stability, mechanical strength, air tightness, high transparency and gloss, toughness and wear resistance, and is currently the most widely used printing film. Generally, the thickness is 20-40 μm, and the most widely used is 20 μm. Its main disadvantage is poor heat-sealability, so it can generally be used as the outer layer of composite film. For example, it has ideal moisture resistance, transparency, strength, stiffness and printability after being composited with polyethylene film, and is suitable for holding dry food.
Biaxially stretched PE film has the advantages of light weight, non-toxic, odorless, moisture-proof, high mechanical strength, good dimensional stability, good printing performance, and good transparency. It has the advantages of high transparency, good gloss, good barrier properties, high impact strength and low temperature resistance. It is widely used in the packaging of food, candy, cigarettes, tea, juice, milk, textiles, etc.