Injection molding

A detailed Summary of Injection molding

Injection molding is a process used to form products from plastic. The process

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

metals when tooling life is not an issue. Tooling costs can range from $5,000 to

processing except injection molding. These parts typically become feasible around 1,000

be used. The process starts by melting the polymer resin. Once the resin is melted, a mold

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Category: Technology

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