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Hot Embossing by Matthias Worgull

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2.3.1. Injection Molding Process

In general, the injection molding process is simply characterized by an injection of polymer melt into a tempered mold. The polymer in granulate form will be heated up into the plastifying unit to a temperature range above the melting range of polymers so that a viscous polymer melt will be achieved. The polymer melt will be compressed and injected via a nozzle and a runner system into the cavities of a mold. The basic component of every injection molding process is a plastifying screw, by which granulate during the rotation are dosed, melted, compressed, and finally injected into a mold. The injection occurs by a translational shift of the screw. A backflow valve inhibits the backflow of the molten polymer, ...

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