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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
ring gate
Manufacturing; Plastic injection molding
Used on some cylindrical shapes. This gate encircles the core to permit the melt to first move around the core before filling the cavity.
retractable cores
Manufacturing; Plastic injection molding
Used when molding parts in cavities not perpendicular to the direction in which the part is ejected from the mold. The cores are automatically pulled from the mold prior to the mold opening and ...
runner design
Manufacturing; Plastic injection molding
using the runner as a flow control device (positioning the gate and using the size of the runner to control the filling pattern within the cavity) in addition to getting the melt into the cavity.
regrind
Manufacturing; Plastic injection molding
Waste material such as sprues, runners, excess parison material and reject parts from injection molding, blow molding and extrusion, which has been reclaimed by shredding or granulating. Regrind is ...
flow marks
Manufacturing; Plastic injection molding
Wavy surface appearances on a molded part caused by improper flow of the melt into the mold.
suck-back
Manufacturing; Plastic injection molding
When the pressure on the sprue is not held long enough for the melt to cool before the screw returns. Some of the melt in the cavities or runner system may expand back into the nozzle and cause sinks ...
delamination
Manufacturing; Plastic injection molding
When the surface of a finished part separates. Strata or fish-scale-type appearance may be visible where the layers may be separated.
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