Extrusion & Post
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HIPS Sheet Extrusion Thickness Unevenness
Problem Phenomenon
The transverse thickness deviation of extruded sheets is large.
Cause Analysis
Uneven die lip gap or uneven die temperature distribution; extrusion fluctuations are also transmitted.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
①Precisely adjust the die lip gap; ②balance die temperature; ③stabilize extrusion output; ④online thickness measurement feedback.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Sheet thickness relies on die lip precision and stable extrusion; closed-loop thickness measurement is the guarantee.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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