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1. PVC raw material is Amorphism High Polymer ,the detail characters as followings:
No obviously Melt point , degradate ahove 1500C in air, even if add stabilizing agent, tooling temp. under 2000C, it’s not good for Heating stability ,whatever is higher for temp or Heating longer as to degradation.
PVC raw material is more viscosity in melding condition, bad to processing flowing and causes to reduce thrill and causticity gas.
2. Special design PVC screw for Injection molding machine to produce PVC pipe fitting, smaller compress ratio to suitable for compress length as to decrease shear heat, screw design with double spiral groove divide into not plasticizing PVC raw material and barrier-type mixed water stage for anterior designing as to improve mixed effect. Screw surface with special hard chrome plating to prevent causticity gas.
It’s very strictly control to PVC raw material temp, special Barrel surface with double spiral groove which is regard as cooling air to control inside barrel temp, prevent degradation over Heating.
It’s big viscosity in melting condition for PVC raw material, enlarge corresponding nozzle mouth, meanwhile enlarge Hydraulic motor as to enlarge screw torque.
PVC OR PPR pipe fitting injection machine --CE