Extrusion & Post
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PVC Wire and Cable Extrusion
Problem Phenomenon
Cable insulation layer had pores, failed the breakdown test, and showed surface eccentricity
Cause Analysis
Insulation pores originate from damp granules or degradation gas; poor mold centering causes eccentricity; improper temperature control of soft PVC affects insulation performance consistency; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Dry the granules and control extrusion temperature; ②adjust mold centering; ③online diameter measurement and spark detection of the insulation layer; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The quality of PVC cable is electrical safety; pores and eccentricity are two major veto items, and online detection must be configured; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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