Transcription of INEOS Polypropylene Processing Guide
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INEOS Polypropylene Processing Guide
Polypropylene Processing Guide 2 Table of Contents Introduction Part Design Wall thickness Design reinforcements Draft angle Shrinkage Sink marks Undercuts Integral hinges Mold Design Sprue Runner shapes and layout Gate types Gate location Integral hinge gates Mold temperature control Clamp requirements Knock outs Vents Material Selection Resin flow Molding Area Diagrams Antistat Nucleation Injection Molding Cylinder temperature Injection pressure Injection time Mold temperature Cure time Back pressure Screw speed Mold release Extrusion General Downstream Sheet Film Tape yarns Fiber Thermoforming / Solid Phase Forming Finishing Hot stamp printing Vacuum metalizing Surface treatment Gas flame Corona Discharge 3 3 5 6 7 8 9 10 10 11 Machining Properties Turning
Sprue To prevent sprue sticking, highly tapered sides (3 to 5 degrees including angle) are required. It is also desirable to keep the sprue length down to 3 inches to help minimize ejection problems. Extended nozzles are used if the sprue length becomes objectionable. Various types of sprue pullers have been successfully
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