PPS Injection molding process

What Is Polyphenylene Sulphide (PPS)

PPS stands for Polyphenylene Sulphide is a high-efficiency engineering thermoplastic that is distinguished by its atypical blend of properties.

It is a semi-crystalline, opaque and rigid polymer that has a very high melting point (280°C) and comprises of para-phenylene units that alternate with their sulphide linkages.

PPS have a superb balance of properties such as inherent flame resistance, good chemical resistance, high-temperature resistance, dimensional abilities, exceptional mechanical strength and electrical insulation.

PPS can easily be processed because its toughness increases with higher temperatures.

All these awesome qualities make PPS an excellent alternative to thermosets and metals for use in several applications and appliances, automotive parts and electronics.

Many customers in the PPS injection molding parts have a kind of inertia thinking: no mold temperature, gate is not large, insufficient exhaust, short cooling time.

Mold temperature can make the surface of the product fast crystallization, smooth without floating fiber flow, the most important is to make the strength of the product greatly strengthened; the size of the gate affects the amount of plastic injection, and there will be requirements for the setting of pressure and rate of injection. It will also have an effect on the distal pressure loss of multi-point products.

Insufficient exhaust will cause rapid accumulation of gas, resulting in burning and pattern on the surface and tail of the product.

PPS itself material will contain sulfide and other small amount of polyphenylbiphenyl polymer precipitation, so the design of exhaust is very important!

Short cooling time, not conducive to the full crystallization of the product!

In order to pursue production capacity, many customers directly reduce the production cycle to a large extent, resulting in shorter material crystallization cycle, which is not conducive to the solution of the phenomenon in the first one!

Reasonable selection of materials, scientific manufacturing!

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