Transcription of INEOS Polypropylene Processing Guide - INEOS Group
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INEOS Polypropylene Processing Guide - INEOS Group
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 Tur
The linear mold shrinkage of injection molded parts will vary from 0.008 to 0.025 inches per inch, depending on the particular resin, molding conditions, part design, part wall thickness, and direction of flow. Figure 1 presents the shrinkage of polypropylene versus wall thickness in injection molded parts. These data were obtained from many and
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