Type of plastic film

PVA coated high barrier film

Price performance ratio of plastic film

PVA coated high barrier film is printed and compounded by coating PVA with nano inorganic substances on polyethylene film. Without significantly increasing the cost, its barrier performance is not only significantly better than EVOH five layer co extruded film, but also the packaging cost is significantly reduced, which can not only ensure all the quality requirements for aseptic packaging of the packaged materials, but also significantly reduce the cost of aseptic packaging for food processing enterprises, It can be used to package drinks, fruit juice, milk, soy sauce and vinegar.

Biaxially oriented polypropylene film (BOPP)

Biaxially oriented polypropylene film is made by co extruding polypropylene particles into sheets, and then stretching in both vertical and horizontal directions. Due to the tensile molecular orientation, this kind of film has good physical stability, mechanical strength, air tightness, high transparency and glossiness, and is tough and wear-resistant. It is the most widely used printing film with a thickness of 20-40 μ m. The most widely used is 20 μ m 。 The main disadvantage of biaxially oriented polypropylene film is its poor heat sealing property. Therefore, it is generally used as the outer film of composite film. For example, the moisture-proof property, transparency, strength, stiffness and printability of composite film with polyethylene film are ideal, and it is suitable for containing dry food. As the surface of biaxially oriented polypropylene film is non-polar, with high crystallinity and low surface free energy, its printing performance is poor, and its adhesion to ink and adhesive is poor, so surface treatment is required before printing and laminating.

Low density polyethylene film (LDPE)

Low density polyethylene film is generally made by blow molding and tape casting. The thickness of cast polyethylene film is uniform, but because of its high price and low cost, it is most widely used. Low density polyethylene (LDPE) film is a translucent, shiny, soft film with excellent chemical stability, heat sealing, water resistance, moisture resistance, freezing resistance and boiling. Its main disadvantage is its poor oxygen barrier, which is commonly used in the inner film of composite flexible packaging materials. It is also the most widely used and most widely used plastic packaging film, accounting for more than 40% of the consumption of plastic packaging film.

Because polyethylene molecule does not contain polar groups, and has high crystallinity and low surface free energy, the printing performance of the film is poor, and the adhesion to ink and adhesive is poor, so surface treatment is required before printing and composite.

Polyester film (PET)

Polyester film is made of polyethylene terephthalate as raw material, which is extruded into thick sheets and then biaxially stretched. It is a colorless, transparent and glossy film with excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high and low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention. It is one of the commonly used barrier composite film substrates. However, the price of polyester film is relatively high, and the general thickness is 12 μ m. It is often used as the outer material of cooking packaging, with good printability.