Plasticized polyvinyl chloride (P-PVC)
Barrel temperature:
feeding zone: 30～50°C (50°C)
Zone 1: 140 ~ 160 ° C (150 ° C)
Zone 2: 150 to 180 ° C (165 ° C)
Zone 3: 160 ~ 220 ° C (180 ° C)
Zone 4: 160 ~ 220 ° C (190 ° C)
Zone 5: 160 ~ 220 ° C (190 ° C)
Nozzle: 160～220°C (200°C)
The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1.
Melt temperature: 200 ~ 220 ° C
Barrel constant temperature: 120 ° C
Mold temperature: 30 ~ 50 ° C
Injection pressure: 80 ~ 120MPa (800 ~ 1200bar)
Holding pressure: 30% to 60% of injection pressure
Back pressure: 5～10MPa (50～100bar)
Injection speed: In order to obtain a good surface quality, the injection should not be too fast (multi-stage injection if necessary)
Screw speed: set the medium screw speed, the maximum folding line speed is 0.5m / s
Measuring stroke: 1.0 ~ 3.5D
Residual amount: 2 ~ 6mm, depending on the metering stroke and screw diameter
Pre-drying: not required; only when the storage conditions are not good, it can be dried at 70 ° C for 1 h.
Recovery rate: allows recycling of materials without thermal decomposition
Shrinkage: 1% to 2.5%
Gate system: point gates can be used for small products; the gate should have a circular arc in the direction of the product.
Machine downtime: turn off heating, no back pressure plasticizing, operate several times of extrusion cycle barrel equipment: standard screw, check ring, straight through nozzle.
