Sprues,runners and gates of plastic mold
What are the sprue, runner or gate?
Sprues,runners, and gates fulfill the function of conveying the plastics melt from the nozzle of the injection unit to the individual cavities. While it is true that those plastic materials may be reused in the form of regrind, their presence nevertheless means a reduction in the performance of the injection molding machine since they must be plasticized in the barrel. With smaller parts,they may account for 50 % or more of the actual shot weight. plastic mold feed system -
Sprue The sprue may be considered the continuation of the mold to the nozzle of the injection machine. Single-cavity molds where the sprue links directly to the molded part are said to have direct sprue gating. Very often, the performance of a single-cavity injection mold is determined by the cooling time of this sprue. In addition to providing adequate cooling of the sprue bushing, the diameter of the smallest opening in the sprue bushing should be kept as small as possibl...
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