Splay in injection molding manifests as silver or white streaks on molded parts, compromising both aesthetic appeal and structural integrity, caused by moisture, air entrapment, and degradation.
Moisture entrapment occurs when raw materials contain water. This water, when heated, steam forms, leading to trapped air and visible streak marks on the surface.
Material degradation can result from overheating or improper storage. As materials break down, gases can form, contributing to splay defects that mar the final products.
Inadequate venting in molds or excessively high injection speeds can trap stagnant air or gas, which is another leading cause of splay in molded pieces.
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