Injection Molding
6 조회수
PVC Injection Short Shot
문제 현상
Thick-wall pipe fittings partially underfilled, incomplete filling.
원인 분석
PVC melt viscosity is high, flow resistance large; low temperature, insufficient pressure, poor venting; PVC's high viscosity characteristic makes it more sensitive to temperature and pressure; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
해결 방법
①Increase melt temperature (within safe window); ②Increase injection pressure and speed; ③Enlarge gate; ④Open or clean vent grooves at corresponding positions to ensure smooth gas discharge; ⑤Optimize runners.
핵심 요약
PVC short shot = 'the pressure-temperature account of high viscosity': raise temperature and pressure within the safe window; PVC is heat-sensitive, heating must be cautious — large gates and venting are often safer and more effective than forced heating.
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