PLASTIC INJECTION MOLDING cs.net
a PRECISION MOLDED PLASTICS guide
PLASTIC INJECTION MOLDING
DEFINITIONS, CAUSES & REMEDIES
COMMON PART DEFECTS
INTRODUCTION
Experiencing quality issues with your plastic injection molded parts?
There are many potential causes and contributing factors for nonconformities, including part design, mold quality, and the manufacturing process.
Although an exhaustive review is outside the scope of this document, this guide gives a brief description of some of the most common part defects, their likely causes, and possible remedies.
Page 2 of 10
COMMON PART DEFECTS
SINK
Depressions on a part surfaces caused by internal shrinkage
LIKELY CAUSES Part Design: Wall, rib or boss too thick Processing: Insufficient cooling time or cavity pressure, or excessive gate temperature
POSSIBLE REMEDIES > Decrease wall, rib or boss thickness, or make processing adjustments
Page 3 of 10
WELD LINES
COMMON PART DEFECTS
Lines on a part surface where molten plastic met (aka knit lines)
LIKELY CAUSES Part Design: Holes or elements in the part around which plastic must flow and melt back together Processing: Resin not hot enough during molding
POSSIBLE REMEDIES Part Design: Design change or add surface texture to camouflage Processing: Increase material or mold temperature
Page 4 of 10
COMMON PART DEFECTS
FLASH
Excess plastic on the edge of a part
LIKELY CAUSES Tooling: Mold not clamped together with enough force or two mold halves not lining up properly Processing: Excessive pressure
POSSIBLE REMEDIES Tooling: Mold repairs Processing: Adjustments to process
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