Injection Molding
IM
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Definition:
The highest volume method of forming objects from granular or powdered thermosets and thermoplastics, in which the material is forced from an external heated chamber through a sprue, runner or gate into a cavity of a closed mold by means of a pressure gradient, independent of the mold's clamping force. Flaws may occur at fiber ends which tend to induce brittle failure. For a given fiber volume, long fibers are preferred because they introduce fewer ends to the composite than do short fibers. Long fibers with their higher aspect ratios are more prone to be preferentially oriented in a composite matrix, providing improvement in properties.
Definition Copyright ©1989 CRC Press LLC. All rights
reserved.
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