Plastic Injection Molding Shrinkage
Injection molding shrinkage is one of the
properties when the material temperature drips. The rate of injection molding
shrinkage is needed in determining the final workpiece dimensions. The value
indicates the amount of contraction that a workpiece exhibits after it has been
removed from the mold and then is cooled at 23℃ for a period of 48 hours.
Shrinkage is determined
by the following equation:
Injection molding shrinkage rate is a range,
as shown in the Tab 1. Injection molding shrinkage rate is not only related to
plastic type and temperature changes,
but also by the influence of injection molding processing conditions and
product. The material temperature, mold temperature, injection pressure and
holding pressure, cooling strength, workpiece wall thickness, the complexity of
the shapes, filling characteristics and mold structure will affect molding
shrinkage. Therefore, the dimension precision of plastic products is lower than
the metal products. The change of process conditions, plastics batches all can
cause Injection molding shrinkage rate of fluctuations.
The Injection molding
shrinkage rate wave error equation is:
Tab
1 Shrinkage for thermoplastic / %
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