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Kenplas Forum ==> Injection Molding (Machine) ==> INJECTION MOLDING TROUBLE SHOOTING -- UNFLUXED GRANULES IN PART
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It looks that you have selected a wrong screw for pet. pet need a screw with atleastl/d ratio 21 and shallow flight depth like in A type screws and extra power heater then normal machiene. barrier flight type screw is best for high plasticising ,melting requirement.
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Barrel temperature profile wrong. Too cold in the rear and middle zones;
Cold spots in the nozzle or nozzle adaptor;
Cold spots in the hot runner;
Back pressure too low.
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This forum published since July 03, 2002.
Renewed on June 22, 2005. |
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