Injection Molding Process Set-up

1 Injection Machine Barrel Design Each heated zone of the barrel (feed, transition, metering) should be controlled independently and should provide for accurate closed-loop feedback control. A bimetalUc barrel is recommended (an abrasive resistant carbide particle liner material inside an alloy steel outer shell). 

2 Injection Machine Screw Design Any injection molding machine and screw for SPS resins that will be expected to perform optimally must have the following characteristics  

The barrel heaters must have enough capacity to supply the required energy to the process. Heaters with a power capacity of 14w/mm of barrel length have proven satisfactory on a 63-mm machine running at 65kg/h. 

The heaters must be capable of continuous operation at temperatures up to 330 °C. 

The screw must not have a short transition section. Transition sections should be 1/3 the total length of the screw. 

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