Injection Molding - MIT

← Back to document page

Injection GutowskiD. Roylance1V-6 air intake manifoldWater control valveBrass Vs Injection history of plastics1866 Celluloid1891 Rayon1907 Bakelite1913 Cellophane1926 PVC1933 Polyethylene1938 Teflon1939 Nylon stockings1957 velcro1967 The Graduate 1970 Earth Day recycling 3Ref Kalpakjian and SchmidMcCrum, Buckley, Bucknall4OutlineBasic operationCycle time and heat transferFlow and solidificationPart designToolingNew developmentsEnvironment530 ton, fl oz (45 cm3) EngelInjection Molding Machinefor wheel fabrication6Process & machine schematics** Source: *Schematic of thermoplastic Injection Molding machine7Process OperationTemperature: barrel zones, tool, die zonePressures: Injection max, holdTimes: Injection , hold, tool openingShot size: screw window8Typical pressure/temperature cycleTime(sec)Cooling time generally dominates cycle timeTime(sec)* Source.

Non-Isothermal Flow v Flow rate: 1/t ~V/L x Heat transfer rate: 1/t ~a/(L z /2)2 For injection molding For Die casting of aluminum Very small value for aluminum requires thicker runners Small value => Short shot Péclet No. 19

  Value, Injection, Molding, Injection molding