Why Wall Thickness is important for a defect-free plastic?
Metal parts are often designed with thick walls, while plastic products should ideally maintain uniform wall thickness for uniform flow and less shrinkage as illustrated as below. For plastic parts, a gradual change in wall thickness or uniform wall thickness is recommended to reduce stress concentration and other potential issues. In this article we’ll explore what you need to know about the importance of maintaining proper wall thickness in Injection Moulding manufacturing process
- Maintain a wall thickness of less than 5mm because thick walls can lead to long cycle times and poor mechanical properties.
- Avoid large variations in wall thicknesses in order to simplify flow pattern and minimize variations in shrinkage that can lead to warpage.
- Avoid abrupt changes in wall thickness, as this can create stress concentration areas that may reduce a part’s impact strength. Wall thickness changes should have transition zones that reduce the
possibility of stress concentrations, sinks, voids, and warp.
- Avoid gating near an area with a large variation in wall thickness because hesitation and race tracking can create non-uniform flow and Shrinkage.
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