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
recessed to reduce gate scars, long gates, and the possibility of impact directly on the gate. Filled materials require special consideration in gate location. Weld line formations can be weak if they fall in areas that will bear stress or impact. This is particularly true if the wall thickness in the weld is thin – i.e., less than 0.080 inches.
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