Especially for big parts as well as if weld lines shall be avoided sequential injection is useful.
This means that valve gates will be opened and closed one after the another.
Weld lines can be avoided by overflow the gate before opening it.
The quality of the part is improved.
Short flow length make it possible to reduce the filling pressure.
Opening and closing single gates allows to get the packing pressure in requested areas.

Sequential Injection in Plastic Industry

Injection Molding Process: For sequential injection one gate is opened after another.

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This glossary of plastic industry is provided by PLEXPERT Canada Inc.