Before engaging in the flexible packaging industry, you must first understand the basic knowledge of the industry. This article is the basic knowledge of the industry, see if you missed it? 1. Production process 2. Printing Gravure printing: refers to making the characters and patterns on the manuscript into a printing plate, applying ink to the surface of the printing plate, and transferring the graphics on the printing plate to the surface of the printed material by pressure, and accurately and massively copying out The same printed matter as the original. Sub-table printing and inside printing. 3. Compound The basic principle of plastic composite flexible packaging: each material has different advantages and disadvantages. The technology of bonding two or more layers of materials through media (such as glue) to achieve better performance in packaging films and bags. This technique is called "composite process" in the production process. Four, ripening The purpose of curing is to speed up the curing of the glue between the materials. Five, slitting Cut the printed and composite materials into the specifications required by customers. Six, bag making The printed, composite and slitted materials are made into various bags required by customers. Can be made into a variety of bag types: middle seal bag, side seal bag, upright bag, K type bag, R bag, four side seal bag, zipper bag. Seven, quality control 1. Testing before raw materials are put into storage 2. Online product testing Print Inspection-Residual Solvent, Set Position, etc. Composite inspection-composite strength, bubbles, wrinkles, etc. Bag making inspection-sealing strength, size deviation, etc. 3. Quality inspection before product shipment 8. Commonly used printing materials BOPP Biaxially oriented polypropylene, which is a film formed after biaxial stretching, has no heat sealing performance, and is often used as a printing material. Because of its excellent moisture resistance, it is suitable for biscuits, cold fruits, puffed food, and sunflower seeds that are easy to absorb moisture. And other surface printing materials. KOP Coated biaxially oriented polypropylene is coated with a layer of polyvinylidene chloride (PVDC, also known as K coating) on ​​the surface of OPP, so KOP has both OPP performance and PVDC advantages. Commonly used for moon cakes and other foods that require oxygen and water. KOP has a thin aluminum-like barrier function, is transparent, and the contents of the package can be seen. PCO Bidirectional heat-sealable polypropylene film has the properties of OPP and double-sided heat-seal; it is commonly used in the packaging of magnetic disks and laver. PL Bidirectional heat-sealed polypropylene pearlescent film is made of polypropylene resin as the main raw material, adding a certain amount of pearlescent powder, and biaxially stretching. Used for packaging cosmetics, soaps, labels, etc. PET Polyester film Like OPP, it is a two-way biaxially stretched stretch film stretched in the longitudinal direction and then stretched in the transverse direction, or a stretched film stretched at the same time in the vertical and horizontal directions, and then thermally fixed. Commonly used as printing materials for machine packaging roll film, high temperature cooking bags, zipper bags and other products. KPET Chinese name: Coated polyester film is a layer of polyvinylidene chloride (PVDC, also called K coating) coated on the PET surface with a layer of about 1-2um. Therefore, KPET has both the performance of PET and the advantages of PVDC. Commonly used for moon cakes and other foods that require oxygen and water. Like KOP, it has a thin aluminum-like barrier function, is transparent, and the contents of the package can be seen. Its excellent high temperature resistance makes it more suitable for machine packaging and other bag types that require high temperature resistance. NY Nylon, vacuum packaging, freezing, high temperature cooking food packaging; commonly used thickness is 15um, because it is very thin, so it swings very loudly; density is 1.15g / cm3. PVC Polyvinyl chloride, generally used for bottle labels, single layer material, no need to compound after printing, need to use PVC glue (1: 1 ratio of alcohol and cyclohexanone); common thickness: 40um. Mat-opp Biaxially stretched polypropylene matting film is commonly used in the packaging of puffed food, moon cakes, tissues, and cosmetics. Nine, commonly used composite materials CPP Unstretched polypropylene, which is different from stretched OPP, CPP is cooled and solidified in the original state after the film is formed. CPP is the most commonly used heat sealing material. As a printing material, it is often used as a packaging for paper towels; as a composite material, it is often used as a compound with other materials and as a heat seal layer. PET Unstretched polyethylene, commonly used PE are IPE, CPE, LLDPE, ordinary PE. Like CPP, it is the most commonly used heat sealing material. Used for packaging milk powder, shampoo, washing powder and other chemical products. In addition to being commonly used as a surface printing material, it can also be used as a composite material, which has no heat sealing performance and cannot be placed on the heat sealing layer. It is generally used as a middle composite layer of the product, which can increase the bag stiffness and oxygen barrier properties. VMPET Aluminized polyester film, that is, a layer of aluminum foil is vapor-deposited on the surface of PET, which has both the performance of PET and the performance of aluminum foil. VMCPP Aluminum-plated unstretched polypropylene, that is, a layer of aluminum foil is vapor-deposited on the surface of CPP, which has the performance of CPP and AL. AL Aluminum foil has good isolation and shading properties. Aluminum foil itself has low strength, no thermal adhesion, and is easily broken at the fold, so it is rarely used alone. It is generally used for products that are very sensitive to oxygen and moisture. Advanced composite flexible packaging has very good moisture, oxygen and ultraviolet protection. performance. NY Nylon, in addition to being commonly used as a surface printing material, can also be used as a composite material. It has no heat sealing performance and cannot be placed on the heat sealing layer. It is generally used as a middle composite layer of the product, which can increase the sealing strength and puncture resistance of the bag; commonly used For the middle layer of the bag that needs to withstand pressure and high temperature sterilization. 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