Refers to how thick the cross section of the plastic part is This vestige is usually trimmed by the molding machine operator Material protruding from the gate area after gate runner has been removed from the injection molded part. Refers to the portion of the designed component where a slide or hand pull is required to create holes, windows or clips that are not in the line of draw (#1 in Figure 1 below) The molding of plastic parts with wall thicknesses. For example, if you have an inside diameter that is supposed to be. Refers to the amount of metal left on the mold in order to tweak in a dimension. Required for automatic injection moldsĬhannel that links the injection molding machine nozzle to the runner Refers to areas of the molded part where it seems to be sunk in, due to un-uniformed wall sections, thick wall sections and rib/boss to thickness ratios being offĪrea of the custom plastic injection molds that is used for creating undercuts. Term used for slides and/or hand pulls used in the injection mold build process Every plastic material has its own shrink rate ranging from. This % of shrink is added to the part before the mold is designed. Refers to how much the plastic material will shrink after cooled. The result of a plastic part not filling completely, including some or all of the details Too much shear can cause the plastic material to burn, too little can cause the material to freeze off causing short shot Refers to when plastic enters into the mold and the melt is maintained by friction produced by speed and pressure. Also, used to minimize warp (#3 in Figure 1 below)Ī channel cut into custom injection molds, in which plastic travels from the injection molding machine, through the sprue, through the runner and then through the gate ultimately filling the part Refers to thin bladed features on a part that are used for strengthening wall sections and bosses. The direction in which the two custom injection mold halves will separate from the plastic part allowing it to be ejected without any obstructions from metal creating undercuts Pin used to actuate the slide on an automatic injection mold Refers to the portion of an automatic custom injection mold that keeps the slide in the forward position when the molding machine is closed on the mold They are manually removed from the mold during the part ejection process. Manually Trimmed Gates: Gates that require an operator to separate parts from runners during a secondary operationĪrea of the custom injection mold that holds the slide down so the cam can actuate itĪluminum or steel feature in a mold used to create undercuts in molded parts. Automatically Trimmed Gates: Gates that incorporate features in the tool to break or shear the gate as the molding tool is opened to eject the partĢ. Refers to where the plastic enters into the cavity of the mold. Generally all plastic components should be designed with draft where possible Refers to portion of injection molding part that has some taper to make it easier to remove from the mold. This portion of the part has no end use function other than lightening the part and reducing warp Refers to the portion of a part that is gutted out in order to achieve uniform wall thickness. Refers to the side of the tool where the plastic part is injected from also known as the bottom half of the tool Refers to the upper half of the injection mold usually the show surface of the finished product but is mainly concave Refers to the round protrusions on plastic parts and molds (#2 in Figure 1 below)
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