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Plastic injection molding

Plastic injection molding is the primary process for manufacturing plastic parts used in consumer goods such as computer keyboards, monitors, bottle caps, cups and solid plastic articles. Plastic is known to be a very versatile and economical material that is used in many applications. Injection molding involves taking plastic in the form of pellets or granules and heating this material until a melt is obtained. Then the melt is forced into a split-die chamber/mold where it is allowed to "cool" into the desired shape. The mold is then opened and the part is ejected, at which time the cycle is repeated.

Contributors in Plastic injection molding

Plastic injection molding

Pulled gate

Manufacturing; Plastic injection molding

Area where the part was connected to the sprue or runner that has been drawn out or stretched from the surface.

Dominant flow path

Manufacturing; Plastic injection molding

At the juncture of two confronting flows the dominant flow will reverse the direction of the other.

Hopper loader

Manufacturing; Plastic injection molding

Auxiliary equipment for automatically loading resin pellets into machine hopper.

Brighteners

Manufacturing; Plastic injection molding

Are used to add smoother or brighter coatings or finishes.

Scrap

Manufacturing; Plastic injection molding

Any output of a mould that is not usable as the primary product.

Melt index

Manufacturing; Plastic injection molding

The amount of a thermoplastic resin, measured in grams, which can be forced through a specified orifice within ten minutes when subjected to a specified force. (ASTM D-1238)

Abrasion resistance

Manufacturing; Plastic injection molding

The ability of a material to withstand mechanical actions such as rubbing, scraping, or erosion, that tend progressively to remove material from its surface.

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