Injection Molding
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Burnt Marks Appearing at the Weld Line Position of acrylonitrile-styrene copolymer Injection Molded Products
Problem Phenomenon
Burnt marks appear at the weld line position of the product, affecting the product appearance and service performance.
This problem often occurs in acrylonitrile-styrene copolymer '2079851475616104452 and needs to be solved in time.
Cause Analysis
（1）The processing temperature is set improperly (200-260°C range), resulting in unstable melt quality
（2）The acrylonitrile-styrene copolymer material characteristics (chemical resistance, transparency, chemical resistance) are sensitive to this defect
（3）The mold design or condition is poor, affecting the molding quality
（4）The process parameters (injection speed, holding pressure, etc.) are set unreasonably
（5）Improper raw material pretreatment or regrind use problems
Solution
（1）First check and optimize the barrel temperature to ensure a reasonable setting within the 200-260°C range
（2）Adjust the injection speed and holding pressure; the recommended holding pressure of acrylonitrile-styrene copolymer is 80-120MPa
（3）Check the mold temperature (50-90°C range) and the venting condition
（4）Ensure the raw material is fully dried (70-80°C, 3-4h)
（5）Control the regrind ratio to no more than 15-20%, and regularly check the equipment status
Key Takeaway
This problem needs to be systematically solved from three aspects: material characteristics, process parameters, and mold conditions.
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