Injection Molding
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PVC Injection Hot Runner Problems
Problem Phenomenon
Hot runner PVC products have gate burnt material and black specks, quality unstable.
Cause Analysis
Hot runner dead corners + temperature control deviation cause PVC to stay and degrade in hot runner; PVC has extremely high requirements for hot runner temperature control precision, local overheating immediately degrades; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Hot runner precise temperature control (±1℃), point-by-point calibration; ②Use dead-corner-free runner design to reduce retention; ③Empty melt in hot runner before shutdown; ④Regularly dismantle and clean hot runner and die head, remove retained material; ⑤Hot runner point-by-point temperature calibration.
Key Takeaway
PVC + hot runner = 'high-precision temperature control challenge': dead corners and temperature control deviation are the two minefields; PVC with hot runner has extremely high system precision requirements, needs dedicated design and maintenance.
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