22 Terms
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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.
Industry: Manufacturing
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Plastic injection molding
Poisson's ratio
Manufacturing; Plastic injection molding
The constant relating the changes in dimensions which occur when a material is stretched. It is obtained by dividing the change in width per unit length by the change in length per unit length.
Orientation
Manufacturing; Plastic injection molding
The arrangement of the molecules of the melt. If the molecules are orientated, they are aligned with each other; if non-orientated they are not in alignment. In general, orientated material shrinks ...
Coefficient of thermal expansion (CTE)
Manufacturing; Plastic injection molding
The change in length of a material for a unit change in temperature, per unit of length.
Moldability
Manufacturing; Plastic injection molding
The characteristics of being easy to mould without rupturing or developing flaws due o movement of the polymer during gelation.
Haze
Manufacturing; Plastic injection molding
The cloudy appearance of a material caused by light scattered from within the specimen or from its surfaces.
Copolymer
Manufacturing; Plastic injection molding
The chemical reaction of two different monomers with each other, result in a unique new polymer.
Gate
Manufacturing; Plastic injection molding
The channel through which the molten resin flows from the runner into the cavity.
