Basic Design Guidelines for Injection Moulding

 


  • Material considerations: Choose material that meets the functional requirements of the part and have good processing characteristics. Also consider the material’s availability [i.e., in stock or short lead time and MOQ (minimum order quantity)] is low.

  • Wall thickness: The part wall thickness should be as uniform as possible. Uneven wall thickness causes uneven flow, leading to moulding defects. Also, keep the wall thickness within “recommended wall thickness” for the resin used to create the part.
  • Include Ribs: A plastic part that has been designed within the recommended range may not be strong enough to support itself/ functional requirements; ribs are added to reinforce the part.
  • Rib/Wall Thickness Ratio: Always maintain recommended rib-to-wall thickness ratio so that the thickness at the rib area is not excessive (this can cause sink). Typically, the rib needs to be 0.6 times the wall thickness. Also ensure you have the radius at the junction of the rib/wall to eliminate stress and facilitate flow.

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