DESIGN TIP: Improving Part Design with Uniform Wall Thickness

Designing parts with consistent wall thickness is a fundamental rule of plastic injection molding, and ignoring it can lead to sink, warp and inaccurate or non-functional parts. Yet the functional requirements of consumer, medical, aerospace and industrial products often leave designers little consideration for the material flow and fill properties of plastic, both of which are at least partially determined by wall thickness.

Pay close attention to rib-to-wall thickness ratios. To prevent sink, the thickness of the rib should be about half of the thickness of the wall.

This month’s tip discusses:

  • Guidelines to avoid cosmetic defects associated with thin and thick features
  • Material alternatives to improve wall thickness consistency
  • Important questions to ask about material properties
  • The benefits of design for manufacturability analysis


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