Transcription of Polypropylene - Fpc USA
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Polypropylene - Fpc USA
Formolene PolypropyleneInjection Molding Process GuidelinesPolypropyleneInjection Molding Process GuidelinesThe following is given as a potential process starting point. The final molding process may be dependent upon factorslike: part and tooling design, wall thickness, flow lengths, gate size, number of cavities, cycle time and desired level ofmolded part quality, for Temperature: 400 470 F (200 250 C)Set barrel temperatures, screw speed (60 to 125 rpm) and back pressure (50 to 200 psi) so that the melt temperaturecoming out of press nozzle is in the above range, , temperature of an airshot using a needle Temperature:Rear: 390 - 440 F (199 227 C)Middle: 390 450 F (199 232 C)Front: 390 470 F (199 250 C)Screw Speed: 50 125 rpmBack Pressure:50 200 psiMold Temperatures:60 120 F (15 to 50 C) inch maximumShot Size:40 60 % of barrel capacityInjection Speed:As fast as possible without causing cosmetic defectsPack / Hold Pressure:50 75 % of injection pressureHold Time:Until gate freeze achievedScrew Type:Single stage general purposeL/D ratio: 20:1 to 24:1 Compression ratio: :1 to 3.
3 Injection Molding Process Guidelines Problems Observed Possible Causes Corrective Actions Black Specks • Material Degradation • Excessive melt temperature/residence time in barrel/ runner system • Resin contamination • Excessive back pressure
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