Thermoforming
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Burnt marks in the slider area of high impact polystyrene injection products
Problem Phenomenon
Burnt marks appear in the product slider area, affecting product appearance and use performance.
This problem frequently occurs in high impact 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) High impact polystyrene material characteristics (rubber toughening, impact resistance, opacity, easy '2079851475616104458) 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; high impact 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, 3-4h)
(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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