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Compression Molding
Compression molding (also known as press molding or compression molding) is a process in which powdered, granular or fibrous plastics are placed into a mold cavity at molding temperature, and then the mold is closed and pressurized to form and solidify it. Compression molding can be used for thermosetting plastics, thermoplastics and rubber materials. Introduction…
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Extrusion Molding
Extrusion molding is also called extrusion molding in plastic processing. It is a processing method that uses hydraulic pressure on the mold itself to extrude. It refers to the action between the barrel and the screw of the extruder, while being heated and plasticized, and being pushed forward by the screw, and continuously passing through…
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Polystyrene (PS)
Polystyrene (PS) is a polymer synthesized from styrene monomers by free radical addition polymerization, and its chemical formula is (C8H8)n. It is a colorless and transparent thermoplastic with a glass transition temperature higher than 100°C, so it is often used to make various disposable containers that need to withstand the temperature of boiling water, as…
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Polyvinyl chloride (PVC)
Polyvinyl chloride (PVC) is the third largest synthetic polymer plastic in the world (after polyethylene and polypropylene ), with an annual production of about 40 million tons of PVC. PVC is a polymer formed by the polymerization of vinyl chloride monomer (VCM) in the presence of initiators such as peroxides and azo compounds or under…
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Polyethylene terephthalate (PET)
Polyethylene terephthalate (PET), with the chemical formula (C10H8O4)n, is obtained by ester exchange of dimethyl terephthalate with ethylene glycol or esterification of terephthalic acid with ethylene glycol to synthesize dihydroxyethyl terephthalate, followed by polycondensation. It is a crystalline saturated polyester, a milky white or light yellow, highly crystalline polymer with a smooth and glossy surface.…
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Low density polyethylene (LDPE)
Low-density polyethylene, also known as high-pressure polyethylene (LDPE), is the lightest variety of polyethylene resin. It is milky white, tasteless, odorless, non-toxic, and matte waxy particles. It has good softness, extensibility, electrical insulation, transparency, easy processing, and certain air permeability. It has good chemical stability and is resistant to alkali and general organic solvents. Overview…
