Classification of film

PVA coated high barrier film

PVA coated high insulation film is made by coating PVA with nano-inorganic substance on polyethylene film and then printing and compounding it. It has processed the current three-layer polyethylene co-extrusion packaging film without major fluctuations and increased costs. Isolate poor skills bottlenecks. In 2008, Cangzhou Jinlong Plastics Co., Ltd., through three years of hard work and independent innovation, the scientific research personnel finally took the lead in bringing the national patented product, PVA coated high-isolation milk film, to the market. In the past two years, the milk film used by some domestic dairy processing companies for aseptic packaging has chosen the high-insulation film produced by the company, and the oxygen barrier rate is less than 2cm3/(m2・24h・0.1MPa). Its insulation function is not only significantly better than evoh's five-layer co-extruded film, but also the packaging cost is greatly reduced. This not only guarantees all the quality requirements for aseptic packaging of the packaged material, but also reduces the aseptic packaging of food processing enterprises. The cost of the three-layer polyethylene co-extrusion packaging film has been solved, and it can be used for packaging beverages, juice, milk, soy sauce and vinegar.

Biaxially oriented polypropylene film (BOPP)

　　 Biaxially oriented polypropylene film is made by co-extrusion of polypropylene particles into a sheet, and then stretched in both vertical and horizontal directions. Because of the orientation of the stretched molecules, this film has good physical stability, mechanical strength, air tightness, high transparency and gloss, toughness and wear resistance. It is the most widely used printing film at present, and the thickness is generally 20 ～40 μ m, the most widely used is 20 μ m. The main defect of biaxially oriented polypropylene film is poor heat-sealability, so it is generally used as the outer film of composite film. For example, after being composited with polyethylene film, the moisture resistance, transparency, strength, stiffness and printability are all ideal, suitable for Pack boring food. Because the appearance of the biaxially oriented polypropylene film is non-polar, the crystallinity is high, and the free energy of the appearance is low. Therefore, its printing function is poor, and the adhesion to the ink and adhesive is poor. The appearance is required before printing and lamination. deal with.

Low-density polyethylene film (LDPE)

　　 Low-density polyethylene film is generally made by blow molding and casting. The thickness of cast polyethylene film is uniform, but because of the high price, it is rarely used now. Blow molded polyethylene film is made of blow molding grade PE particles blown by a blow molding machine. The cost is low, so it is the most widely used. Low-density polyethylene film is a semi-transparent, shiny, and soft film with excellent chemical stability, heat sealability, water resistance, moisture resistance, freezing resistance, and boiling. Its main defect is its poor insulation against oxygen. It is often used in the inner film of composite flexible packaging materials. It is also the most widely used and most used plastic packaging film, accounting for more than 40% of the consumption of plastic packaging film. .

Because the polyethylene molecule does not contain polar groups, and has high crystallinity and low surface free energy, the film has poor printing function and poor adhesion to ink and adhesive, so it is required before printing and lamination Perform appearance treatment.

Polyester film (PET)

　　 Polyester film is a material made of polyethylene terephthalate, which is made into thick sheets by extrusion, and then biaxially stretched. It is a colorless, transparent and shiny film with excellent mechanical functions, high rigidity, hardness and resistance, puncture resistance, conflict resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention Outstanding, is one of the commonly used barrier composite film substrates. However, the price of polyester film is higher, and the thickness is generally 12mm. It is commonly used as the outer layer of retort packaging and has better printability.

Nylon film (PA)

Nylon film is a very tough film with good transparency, excellent gloss, high tensile strength, high tensile strength, and good heat resistance, cold resistance, oil resistance and organic solvent resistance. Excellent abrasion resistance, puncture resistance, and relatively soft, excellent oxygen barrier, but poor insulation to water vapor, high moisture absorption, moisture permeability, poor heat sealability, suitable for packaging hard items, such as greasy Sexual food, meat products, fried food, vacuum packaged food, steamed food, etc.

Cast polypropylene film (CPP)

Cast polypropylene film is a polypropylene film produced by a casting process. It can be divided into general CPP and cooking grade CPP. It has excellent transparency, uniform thickness, and uniform vertical and horizontal functions. It is generally used as a composite film. Internal data. Generally, the thickness of CPP film is generally between 25 and 50μm. After being compounded with OPP, the transparency is better, the appearance is bright, and the hand feels hard. This kind of material is used for general gift packaging bags. This film also has outstanding heat sealability. The thickness of cooking-grade CPP film is generally between 60 and 80 μm. It can be cooked at 121°C for 30 min. It has good oil resistance, air tightness, and high heat seal strength. The inner layer of general meat packaging is uniform. Use cooking grade CPP film.

Aluminized film

　　 The most commonly used aluminized films are mainly polyester aluminized film (VMPET) and CPP aluminized film (VMCPP). Aluminized film has both the characteristics of plastic film and the characteristics of metal. The function of aluminum plating on the surface of the film is to shield light and prevent ultraviolet rays, which not only extends the shelf life of the contents, but also improves the brightness of the film. It replaces the aluminum foil to a certain extent. It also has a cheap, beautiful and better insulation function. , Aluminized film is widely used in composite packaging. Now it is mainly used in packaging of dry and puffed food such as biscuits, as well as the outer packaging of some medicines and cosmetics.