In the injection molding process, the period of filling cold runner (if it exists) and cavity is called injection time (purple line in time pressure diagram below).
A slow injection time has the advantage to have less shear and gentler treated material.
However, too low injection times lead to pressure increase or incomplete part filling.

Injection Time in Plastic Industry

Injection Molding Process: The injection time is the time needed to reach 100 % of part filling.

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