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To insure a quality final product, it is necessary to start out with quality components. Injection molded parts can be molded to a high quality standard by focusing on these areas of plastic technology:Only by drawing on expertise from these three areas of plastic technology can a product designer create quality molded parts that maximize performance and are cost effective. The purpose of this design guide deals with the first of these three issues - part design.

Correct Part Design Guidelines

If there was only one rule for the injection molding process it would have to be to maintain uniform wall thickness. Here are some examples of problems associated with part designs that feature a non-uniform wall thickness.

Sink marks due to uneven shrinkage


Sink marks result from a wall yielding to the still shrinking interior mass.

Stress due to uneven shrinkage


Sink marks result from a wall yielding to the still shrinking interior mass.

Voids due to uneven shrinkage


The already cooled section will not yield to the shrinking action of the cooling interior mass causing voids in the thick portion of the part.

Warping due to uneven shrinkage


Concentrated stress at the junction of high & low shrinkage area may cause a part to warp.

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09/26/16 21:50