๐“๐จ๐๐š๐ฒ'๐ฌ ๐Š๐๐Ž๐–๐‹๐„๐ƒ๐†๐„ ๐’๐ก๐š๐ซ๐ž : ๐–๐ก๐š๐ญ ๐€๐ซ๐ž ๐๐ฎ๐ซ๐ง ๐Œ๐š๐ซ๐ค๐ฌ ๐ˆ๐ง ๐ˆ๐ง๐ฃ๐ž๐œ๐ญ๐ข๐จ๐ง ๐Œ๐จ๐ฅ๐๐ข๐ง๐ ? ๐–๐ก๐ฒ?

 ๐“๐จ๐๐š๐ฒ'๐ฌ ๐Š๐๐Ž๐–๐‹๐„๐ƒ๐†๐„ ๐’๐ก๐š๐ซ๐ž

๐ŸŸข ๐–๐ก๐š๐ญ ๐€๐ซ๐ž ๐๐ฎ๐ซ๐ง ๐Œ๐š๐ซ๐ค๐ฌ ๐ˆ๐ง ๐ˆ๐ง๐ฃ๐ž๐œ๐ญ๐ข๐จ๐ง ๐Œ๐จ๐ฅ๐๐ข๐ง๐ ? ๐–๐ก๐ฒ?๐ŸŸข

When we are doing molds trials and normally you will find some plastic parts with burn mark.

Here share some information about this defect.


Burn marks refer to dark or black marks formed at the end of the flow path or in trapped gas areas during the injection molding process due to poor mold venting or too fast injection, where the air inside the mold does not have time to escape and suddenly heats up under high pressure (in extreme cases, temperatures can reach up to 3000 degrees). The overheated compressed air scorches the melt.


๐ŸŸข Why? Here are 3 reason for your reference ๐ŸŸข

1. Poor mold venting causes the trapped gas to be compressed and overheated.

2. Excessive melt temperature or injection speed.

3. The material remains in the barrel for too long, leading to overheating


source : Michael Qu


#plastics #injectionmolding #injectionmold

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