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Material:POM

What is injection molding?
Injection moulding is a manufacturing process for producing parts by injecting molten material into a mould, or mold. Injection moulding can be performed with a host of materials mainly including metals (for which the process is called die-casting), glasses, elastomers, confections, and most commonly thermoplastic and thermosetting polymers. Material for the part is fed into a heated barrel, mixed (using a helical screw), and injected into a mould cavity, where it cools and hardens to the configuration of the cavity. Injection moulding is widely used for manufacturing a variety of parts, from the smallest components to entire body panels of cars. Advances in 3D printing technology, using photopolymers that do not melt during the injection moulding of some lower-temperature thermoplastics, can be used for some simple injection moulds.

What is the performance of POM?
Typical application range:
POM has a very low coefficient of friction and good geometric stability, especially suitable for making gears and bearings. Because it also has high temperature resistance, it is also used in pipeline devices (pipe valves, pump housings), lawn equipment, etc.
Injection mold process conditions:
Drying treatment: If the material is stored in a dry environment, it usually does not need to be dried.
Melting temperature: 190~230℃ for homopolymer materials; 190~210℃ for copolymer materials.
Mold temperature: 80~105℃. In order to reduce the shrinkage after molding, a higher mold temperature can be used.
Injection pressure: 700~1200bar
Injection speed: medium or high injection speed.
Runner and gate: any type of gate can be used. If a tunnel-shaped gate is used, it is best to use a shorter type. For homopolymer materials, hot nozzle runners are recommended. For copolymer materials, both internal hot runners and external hot runners can be used.
Chemical and physical properties:
POM is a tough and elastic material that has good creep resistance, geometric stability and impact resistance even at low temperatures. POM has both homopolymer materials and copolymer materials. Homopolymer materials have good ductility and fatigue strength, but they are not easy to process. Copolymer materials have good thermal and chemical stability and are easy to process. Both homopolymer and copolymer materials are crystalline materials and are not easy to absorb moisture. The high degree of crystallinity of POM leads to a very high shrinkage rate, which can be as high as 2% to 3.5%. There are different shrinkage rates for a variety of different reinforced materials.