How to avoid flow marks in an injection molded plastic part.

Question

Sigiloso · Accepted Answer

Product designer has to design the part with proper wall thickness and geometric details that assist the moldflow in molding process. Further, during the molding process, we adjust the molding pressure or temperature to speed up the mold flow so that the mold can be filled fast before the material sets in to form the flow mark.

Sigiloso · Answer

Specify on your drawings critical dimensions so your suppliers can assess and understand the scope of what you need. Then when your supplier provides mold flow analysis it can be done with complete information.

Sigiloso · Answer

This really depends on the part. There are general rules of thumb to be followed but some of it is trial and error.

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