Let's see how Flash occurs - Injection Molding Part Problems & Solutions

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Let's see how Flash occurs in this brief video clip from Paulson's powerful online course titled, "Injection Molding Part Problems and Solutions".

[@abcdefghijk6704]

What about mold halves temperatures? Some molders intentionally set different temperatures. Sometimes too much (to overcome flaws like dimensional or shape/geometry issues), resulting in flashing.

[@fettahfares4880]

What he meant by flash occurs ... I didnt get it .. thnx

[@solonglife8130]

What is the example of low viscosity plastic? Can PP considered as one?
Thanks.