Focus on water soluble film application 

Introduction of plastic film types-film suppliers

by:POLYVA     2021-11-02
PVA coated high-barrier film is made by coating PVA with nano-inorganic substance on polyethylene film and then printing and compounding the plastic film cost-effectively. Under the premise of not greatly increasing the cost, its barrier performance is not only significantly better than EVOH The five-layer co-extruded film, and the packaging cost has also been greatly reduced. This not only ensures all the quality requirements of the aseptic packaging of the packaged material, but also greatly reduces the cost of aseptic packaging for food processing enterprises. It can be used for packaging beverages and juices. , Milk, soy sauce, vinegar, etc. Biaxially oriented polypropylene film (BOPP) Biaxially oriented polypropylene film is made by co-extrusion of polypropylene particles to form a sheet, and then stretched in both vertical and horizontal directions. Due to the orientation of the stretched molecules, the film has good physical stability, mechanical strength, air tightness, high transparency and gloss, toughness and wear resistance. It is currently the most widely used printing film, and its thickness is generally 20~ 40 μm, the most widely used is 20 μm. The main disadvantage of biaxially oriented polypropylene film is poor heat sealability, so it is generally used as the outer layer of composite film, such as moisture resistance, transparency, and transparency after being composited with polyethylene film. The strength, stiffness and printability are all ideal, suitable for holding dry food. Because the surface of the biaxially oriented polypropylene film is non-polar, the crystallinity is high, and the surface free energy is low. Therefore, its printing performance is poor, and its adhesion to ink and adhesive is poor. It needs to be surfaced before printing and lamination. deal with. Low-density polyethylene film (LDPE) low-density polyethylene film is generally made by blow molding and casting processes. The thickness of cast polyethylene film is uniform, but due to its higher price and lower cost, 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 and moisture resistance, freezing resistance, and boiling. Its main disadvantage is its poor barrier to oxygen. It is often used as the inner film of composite flexible packaging materials. It is also the most widely used and most used plastic packaging film at present, accounting for more than 40% of the consumption of plastic packaging film. . Since the polyethylene molecule does not contain polar groups, has high crystallinity and low surface free energy, the film has poor printing performance and poor adhesion to inks and adhesives, so it is necessary before printing and lamination. Perform surface treatment. Polyester film (PET) Polyester film is a film material made of polyethylene terephthalate as a raw material, made into thick sheets by extrusion, and then biaxially stretched. It is a colorless, transparent, glossy film with excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention Good, it is one of the commonly used barrier composite film substrates. However, the price of polyester film is relatively high, with a general thickness of 12 μm. It is commonly used as the outer layer material for retort packaging and has better printability. Nylon film (PA) Nylon film is a very tough film with good transparency, good 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 barrier to water vapor, greater moisture absorption and moisture permeability, poor heat sealability, suitable for packaging Hard items, such as greasy foods, meat products, fried foods, vacuum packaged foods, steamed foods, etc. Cast polypropylene film (CPP) Cast polypropylene film is a polypropylene film produced by a casting process. It can be divided into ordinary CPP and cooking grade CPP. It has excellent transparency, uniform thickness, and uniform vertical and horizontal performance. , Generally used as the inner layer material of the composite film. The thickness of ordinary CPP film is generally between 25-50μm. After being compounded with OPP, the transparency is good, the surface is bright, and the hand feels firm. This material is used in general gift packaging bags. This film also has good heat sealability. The thickness of cooking-grade CPP film is generally between 60 and 80 μm. It can withstand high-temperature cooking 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 film surface is to shield light and prevent ultraviolet radiation, which not only prolongs 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 low price, beautiful appearance and better barrier performance. , Aluminized film is widely used in composite packaging. Is a company specializing in the production of PET film with multiple functions, such as: transparent PET film, milky white PET film, release PET film, supply of PET motor film, etc. With a wide variety of products, affordable prices, and environmental protection, we provide customers with excellent quality and service based on the service tenet of excellence in production, honesty and trustworthiness in distribution, and warm and thoughtful service, and the spirit of assisting partners to achieve their own businesses. Interested parties welcome to inquire!
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