Injection molding is considered one of the most common plastic part manufacturing processes.
It can be used for producing parts from both thermoplastic and thermoset
polymers. The process usually begins with taking the polymers in the form of
pellets or granules and heating them to the molten state. The melt is then
injected/forced into a chamber formed by a split-die mold. The melt remains in
the mold and is either chilled down to solidify (thermoplastics) or heated up
to cure (thermosets). The mold is then opened and the part is ejected.
In spite of the relatively expensive
tooling cost, injection molding remains the most popular manufacturing process
for plastic materials in mass production, thanks to its low operational cost,
high throughput, and the flexibility to make parts with complex shapes.
Polymers commonly used for injection molding include
- Polystyrene (PS)
- Acrylonitrile Butadiene Styrene (ABS)
- Polyamide (PA)
- Polypropylene (PP)
- Polyethylene (PE)
- Polyvinylchloride (PVC)
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