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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
Controlled frictional heating
Manufacturing; Plastic injection molding
Runners designed to deliver a higher melt temperature to the cavity. This results in lower stress levels in the part without causing material degradation due to long exposure to elevated temperatures ...
Vented barrel
Manufacturing; Plastic injection molding
Special barrel unit with a vent port over the compression section of the screw to permit escape of gases prior to injecting melt into mold. Often used when moulding moisture-sensitive resins.
Wisps
Manufacturing; Plastic injection molding
Similar to stringing but smaller in size. These also may occur as slight flashing when the mould is over packed or forced open slightly. Mold-parting-line wear or misalignment can also cause wisps.
Acceptable runner/cavity ratio
Manufacturing; Plastic injection molding
Runner systems designed for high pressure drops to minimise material usage and increase frictional heating in the runner.
Non-return valve
Manufacturing; Plastic injection molding
Screw tip that allows for material to flow in one direction and closes to prevent back flow and inject material into the mould (check valve).
Thermoelasticity
Manufacturing; Plastic injection molding
Rubber-like elasticity exhibited by a rigid plastic resulting from an increase in temperature.
Splay marks
Manufacturing; Plastic injection molding
Scan or surface defects on moulded part caused by abnormal racing of the melt in the mold.
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