Injection Molding
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Sink depression at the weld line position of methyl styrene-acrylonitrile copolymer injection products
Problem Phenomenon
Sink depressions appear at the weld line position of the product, affecting product appearance and dimensional accuracy.
This problem frequently occurs in methyl styrene-acrylonitrile copolymer '2079851475616104452 and needs to be solved in time.
Cause Analysis
(1) Improper processing temperature setting (220-280°C range), causing unstable melt quality
(2) Methyl styrene-acrylonitrile copolymer material characteristics (high heat resistance, high heat deflection temperature) are sensitive to this defect
(3) Poor mold design or condition, affecting molding quality
(4) Unreasonable process parameter settings (injection speed, holding pressure, etc.)
(5) Improper raw material pretreatment or regrind use problems
Solution
(1) First check and optimize barrel temperature, ensure reasonable setting within the 220-280°C range
(2) Adjust injection speed and holding pressure; methyl styrene-acrylonitrile copolymer recommended holding pressure 80-120MPa
(3) Check mold temperature (60-100°C range) and venting condition
(4) Ensure raw material is fully dried (80-90°C, 2-4h)
(5) Control regrind ratio not exceeding 15-20%, regularly check 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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