1. Mechanical problems
The barrel was overheated due to abnormal conditions, which caused the resin to decompose at high temperatures and be injected into the product after burns.

2. Mold problems
Mainly due to poor exhaust. At this time, attention should be paid to measures such as adding exhaust grooves and anti-exhaust rods.

3. Molding problems
When the back pressure is above 300MPa, the barrel part will overheat and cause burns. When the screw speed is too high, overheating will also occur, and it is generally in the range of 40 to 90 r / min. When there is no exhaust groove or the exhaust groove is small, the injection speed is too high will cause burns of superheated gas.

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