Injection Molding
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Sink depression at the weld line position of polystyrene 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 polystyrene '2079851475616104452 and needs to be solved in time.
Cause Analysis
(1) Improper processing temperature setting (180-240°C range), causing unstable melt quality
(2) Polystyrene material characteristics (transparent and brittle, good rigidity, low shrinkage rate) 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 180-240°C range
(2) Adjust injection speed and holding pressure; polystyrene recommended holding pressure 80-120MPa
(3) Check mold temperature (40-80°C range) and venting condition
(4) Ensure raw material is fully dried (70-80°C, 2-3h)
(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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