Extrusion & Post
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PSU Extrusion Molding Defects
Problem Phenomenon
PSU extruded sheets and pipes show surface roughness and internal stress; the extrusion process window is narrow; scrap rate is high.
Cause Analysis
PSU extrusion barrel temperature gradually rises from 320 to 400°C; low rotation speed reduces shear heat; die temperature 150~200°C for shaping; mismatched process parameters cause frequent defects.
Solution
①Barrel temperature controlled in stages from 320 to 400°C; ②Low screw rotation speed; ③Die temperature 150~200°C; ④Dedicated high-torque equipment configuration.
Key Takeaway
PSU extrusion has clear temperature and rotation speed specifications; high-viscosity materials require dedicated equipment; the process window is set according to material characteristics.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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