Injection molding

requires a mold, clamping component, injection unit, and some sort of plastic. As time has

advanced so has injection molding by developing new techniques and new products to aid

in the manufacturing of the injection molded parts.

Injection molding was used as early as the 1860’s. It can be used to form many

different products. Whether the products are small, large, complex, or simple they can be

produced. Injection molding has derived from metal die casting. However, the polymer

can’t just be poured into a mold, it has to be forced into the mold cavity. The polymer is

forced into the mold and pressure is held on it to avoid shrinkage in the mold cavity as it

cools. Injection molding is capable of producing a large number of parts with very high

precision. All thermoplastics except polytetraflouroethylene (PTFE), polyamides, and

some aromatic polyesters can be used by the injection molding machine. Some

thermosetting plastics can also be used.

The typical fabrication process can be done by one of two different types of

injection molding equipment. Either a plunger, or reciprocating screw type machine

. . .
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Approximate Word count = 1007
Approximate Pages = 4 (250 words per page double spaced)