Material Drying
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PVC Drying Necessity
Problem Phenomenon
PVC nominally non-hygroscopic so drying skipped, products show silver streaks and bubbles
Cause Analysis
PVC resin itself absorbs little water, but powder and additive surfaces adsorb moisture, and recycled material contains water, trace moisture forms bubbles in melt; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
PVC pellets dried at 75-90℃ for 1-2 hours; powder and recycled material must be dried; sealed new material can skip drying; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PVC drying requirement is not high but cannot be omitted across the board; 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 later
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