Injection Molding
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Burn Marks Appearing at the Weld Line Position of ABS-type variant Injection-Molded Products
Problem Phenomenon
Burn marks appear at the weld line position of the product, affecting product appearance and use performance.
This problem often occurs in ABS-type variant '2079851475616104452 and needs to be solved in time.
Cause Analysis
(1) The processing temperature is set improperly (range 220-260°C), resulting in unstable melt quality
(2) The material characteristics of ABS-type variant (ABS-type material, good fluidity) 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 it is reasonably set within the range of 220-260°C
(2) Adjust the injection speed and holding pressure; the recommended holding pressure for ABS-type variant is 80-120MPa
(3) Check the mold temperature (range 50-90°C) and venting condition
(4) Ensure the raw material is fully dried (70-80°C, 3-4h)
(5) Control the regrind ratio to not exceed 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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