Injection Molding
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PVC Injection Short Shot
Problem Phenomenon
Thick-wall pipe fittings partially underfilled, incomplete filling.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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