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 Chasing Sawing Drilling and tapping Milling and shaping Joining and Welding Methods Spin welding Hot gas welding Hot plate welding or butt welding Heat
Primary runners leading from the sprue to the sub runners should decrease in size at branch points. • Balanced runner systems are desirable to promote simultaneous filling of multi-cavity molds. This technique can lead to extensive runner scrap generations. Other less balanced runner systems can be used for the sake of economy. In such
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