Injection Molding, Rubber Molding, & Plastic Molding - Maintain Consistent Wall Thickness

How to Avoid Warp
How to Avoid Sink

Strengthening the Part with Physical Reinforcement And Draft

Advanced Rubber Part Design and Engineering and Production Capabilities

In order to minimize warped or malformed custom contract manufactured parts, it is important to maintain consistent wall thickness throughout the injection molding process.

How to Avoid Warp

When designing injection-molded parts, it is important to maintain consistent wall thickness and avoid overly thick regions. This is because as the plastics hardens it does so from the surface towards the interior. Too large a thickness results in internal stress that can yield warp in the exterior parts. Also, because thinner sections will solidify more rapidly, adjacent thick and thin sections tend to warp.

Warp can be avoided by using gussets to support corners of the molded part. Also, if the conditions are appropriate, an angled ramp can be integrated into the part.

 

How To Avoid Sink

In addition to the risks of warp, conditions noted above can also result in sink. The integration of thinner, more consistent wall thickness can help alleviate sink.

Thin ribs on thicker walls can also contribute to sinking on the wall’s exterior. It is generally accepted that the rib should be at least half as thick as the wall.

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