Processing Machinery
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PVC Rigid Pipe Insufficient Impact Resistance
Problem Phenomenon
PVC water supply pipe low-temperature falling weight impact unqualified, brittle fracture.
Cause Analysis
Poor plasticization, insufficient or poorly dispersed impact modifier, too much regrind; plasticization and modification system jointly determine impact resistance; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Verify plasticization degree (e.g. dichloromethane immersion method); ②Ensure impact modifier fully dispersed; ③Control regrind proportion and re-dry; ④Do low-temperature falling weight impact sampling test to verify impact performance; ⑤Optimize formula system (additives, fillers, modifiers).
Key Takeaway
PVC rigid pipe impact resistance = 'plasticization + modification system': poor plasticization and insufficient modifier are the two roots; low-temperature impact is the hard indicator of rigid pipe, plasticization and formula must both reach standard.
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