Injection molding of colored plastic part for e.g. door handle, comprises plsticizing plastic granulates by supplying the granulates into injection aggregate, and supplying melted plastic into a cavity of injection molding tool

摘要

The injection molding of colored plastic part (1) for door handle and exterior rear-view mirrors, comprises plsticizing transparent or partially transparent plastic granulates by supplying the granulates into an injection aggregate (10) over an inlet area (11), and supplying melted plastic into a cavity of injection molding tool over an outlet area of the aggregate. A fluid dye is continuously and homogeneously supplied drop by drop to the plastic in the cavity through a revolving and axially movable screw (14), which is arranged in a cylinder (13) of the aggregate. The injection molding of colored plastic part (1) for door handle and exterior rear-view mirrors, comprises plsticizing transparent or partially transparent plastic granulates by supplying the granulates into an injection aggregate (10) over an inlet area (11), and supplying melted plastic into a cavity of injection molding tool over an outlet area of the aggregate. A fluid dye is continuously and homogeneously supplied drop by drop to the plastic in the cavity through a revolving and axially movable screw (14), which is arranged in a cylinder (13) of the aggregate. The cavity is heated through the inlet of the aggregate at 40-60[deg]C. The plasticized plastic and the dye are mixed within the injection aggregate to form homogenized compound, which is injected into the cavity through the outlet area to produce uniformly colored plastic part by polish surface of the cavity. The dye in the plasticized plastic has a volume portion of less than 0.5%. The plsticized plastic with dye in the cavity has a pressure of 400-2000 bar. The plastic has glass fibers, carbon fibers and/or aramid fibers. The supplied quantity of the dye is determined over control- and/or regulation unit. The determination takes place over a mass determination of plastic and the dye. After maximum of 20-70 seconds the tool is opened, so that the plastic part with the fluid dye remaining within the cavity is left. Independent claims are included for: (1) a device for injection molding of colored plastic part; and (2) plastic part for door handle and exterior rear-view mirrors.