I. Price
Plastic protective film is generally 8- 10 yuan/square. This price comes from the internet!
Second, classification
1, high barrier film coated with PVA
PVA coated high barrier film is made by coating nano-inorganic PVA on polyethylene film and printing and compounding. On the premise of not greatly increasing the cost, its barrier performance is not only obviously better than that of EVOH five-layer extruded film, but also the packaging cost is greatly reduced, which not only ensures all the quality requirements of packaged products for aseptic packaging, but also greatly reduces the cost of aseptic packaging for food processing enterprises, and can be used for packaging beverages, fruit juice, milk, soy sauce vinegar and so on.
2. Biaxially oriented polypropylene (BOPP)
Biaxially oriented polypropylene is made of polypropylene particles, which are extruded into sheets and then stretched in vertical and horizontal directions. Due to the orientation of stretching molecules, such films have good physical stability, mechanical strength, air tightness, high transparency, luster, toughness and wear resistance. It is the most widely used printing film at present, and its thickness is generally 20 ~ 40? μ? m？ , the most widely used is 20? μ? m？ . The main disadvantage of biaxially oriented polypropylene is its poor heat sealability, so it is generally used as the outer film of composite film. For example, after being compounded with polyethylene film, its moisture resistance, transparency, strength, stiffness and printability are ideal, and it is suitable for loading dry food. Due to the nonpolar surface of biaxially oriented polypropylene, high crystallinity, low surface free energy, poor printing performance and poor adhesion to ink and adhesive, surface treatment is needed before printing and compounding.
3. Low density polyethylene film
Low density polyethylene films are usually made by blow molding and tape casting. The thickness of cast polyethylene film is uniform, but it is widely used because of its high price and low cost. Low density polyethylene film is a translucent, glossy and soft film with excellent chemical stability, heat sealing, water and moisture resistance, frost resistance and boiling ability. Its main disadvantage is its poor barrier to oxygen. It is often used as the inner membrane of composite flexible packaging materials, and it is also the most widely used plastic packaging film at present, accounting for more than 40% of the plastic packaging film.
Because polyethylene molecules do not contain polar groups, it has high crystallinity, low surface free energy, poor film printing performance and poor adhesion to ink and adhesive, so surface treatment is needed before printing and compounding.
Do you know what plastic protective film is now? Plastic protective film has a certain function of protecting articles, which can be used to hold food or package something. Plastic protective films, like plastic bags, have specifications. Plastic protective films of different sizes can be used to package different things. When choosing plastic protective film, we should pay attention to specifications and quality. The flexibility of plastic protective film is good, but we should also be careful not to use too much force, otherwise it will crack.
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