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Talking about Plastic Molding: Types of Plastic Molding----Acrylic Lens Manufacturer

by:Eugenia     2022-01-06
Injection molding is a method in which the plastic material is first heated and melted in the heating barrel of the injection molding machine, and then the melt is pushed into the cavity of a closed mold by a reciprocating screw. It can not only produce high-precision and high-quality products under high productivity, but also has a wide variety of plastics that can be processed, with large output (about 1/3 of the total amount of plastics) and wide applications. Therefore, injection molding is an important part of plastic processing. One of the molding methods. Extrusion molding Extrusion is a method in which plastic is continuously passed through a die in a flowing state by heating and pressurizing in an extruder. It is generally used for the molding of sheets, pipes, monofilaments, flat wires, films, wires and cables, etc. It has a wide range of uses and high output. Therefore, it is one of the important molding methods for plastics. Foam molding refers to the addition of foaming materials with appropriate foaming agents to produce porous or foamed products. The foamed products have the advantages of low relative density, high specific strength, low raw material consumption, sound insulation and heat insulation, etc. Foam materials include PVC, PE, PS and so on. Products include: films, plates, pipes, and profiles, etc. Foaming can be divided into chemical foaming and physical foaming. Blow molding Blow molding (inflated film) molding (or hollow blow molding) refers to a molding method that uses fluid (compressed air) pressure to inflate the hot thermoplastic parison or sheet in a closed mold into a hollow product. Plastic containers produced in this way. Such as various bottles, square, round or flat barrels, gasoline tanks, etc. have been widely used, newly developed various industrial parts and daily products, such as double-walled box-shaped products, L-ring large drums, palletizing plates , Surfboards, seat backs and desks, as well as automobile front spoilers, belt covers, instrument panels, air conditioning ducts, etc., have been applied in practice. The processed materials are from daily plastics to engineering plastics. developing. Now blow molding has become one of the important molding methods in plastic processing. But the basic steps of the blow molding process are: 1. Melt the material 2. Form the molten resin into a tube or parison 3. Melt and seal the hollow parison in the blow mold 4. Inflate the in-mold parison 5. Cool blow molding Product 6. Take out the product from the mold 7. Trim Injection blow molding Injection blow molding is a blow molding method. First, the plastic is made into a bottomed parison by injection molding, and then it is moved to a blow mold to be blown into a hollow product. This method can produce packaging containers for daily necessities, cosmetics, medicine, food, etc., but their volume should not exceed 1L. Commonly used plastics include polyethylene, polystyrene, and polyvinyl chloride. Extrusion blow molding Extrusion blow molding is a blow molding method. Unlike injection blow molding, its parison is manufactured by extrusion. Stretch blow molding Stretch blow molding is a blow molding method. It uses extrusion, injection molding and other methods to make the parison, and then heat the parison to the stretching temperature, and longitudinally stretch it through the action of internal (such as mandrel) or external (such as clamps) mechanical force, and at the same time or slightly It is then expanded by compressed air for transverse stretching. Acrylic lens manufacturers
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