Extrusion & Post
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PVC Extrusion Pipe Temperature
Problem Phenomenon
Extruded PVC pipe inner wall rough, surface sharkskin, or degraded yellow lines
Cause Analysis
Improper extrusion temperature zoning: feed zone 60-80℃ preheating, compression zone 140-150℃ plasticizing, metering zone 160-170℃ homogenizing, die head 170-180℃ shaping; local overheating immediately gives yellow lines
Solution
①Set and stabilize according to zoned temperature curve; ②Uniform die head temperature to prevent yellow lines; ③Screw speed matched with haul-off; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PVC pipe extrusion is the art of zoned temperature control; each zone has its duty, local overheating immediately shows; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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