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Injection Molding ProcessOnce the material hardens, the mold is

opened and the part is removed.

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What is the Injection Molding?Injection molding is a manufacturing process

for producing parts from both thermoplastic and

thermosetting plastic materials. Material is fed into heated

barrel, mixed, and forced into a mold cavity where it cools

and hardens to the configuration of the cavity.

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Design of Fabrication Injection

Molding MachineMelted plastic forms shot in front of screw Screw moves back as plastic moves forward (reciprocating

screw)

Pellets placed in hopper

Pellets fall into barrel through throat

Pellets packed to form solid bed

Air forced out through hopperPellets melted by mechanical shear between barrel and

screw

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What is Injection Molding used

for? Items made from injection molding

Injection molding is used for manufacturing plastic,

rubber and metal. Materials are fed through a heated

barrel in the machine and forced into a mold where it

will cool and take its shape. An injection molding

machine can stamp out metal car shell parts, rubber

valve steam seals, and even plastic toys for kids.

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Advantages of Injection Molding

High Production rates

Design flexibility

Repeatability within tolerancesCan process a wide range of materials

Relatively low labor

Little to no finishing of parts

Minimum scrap losses

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