A tool for injection molding plastic parts includes a static overall frame and two structural units for forming a cavity. One of the structural units is arranged displaceably relative to the overall frame and the other structural unit in order to remove an injection-molded part from the cavity. The static overall frame is formed by at least two frame units, in particular a first ejector-side tool element and a second nozzle-side tool element, which are displaceable relative to one another, but in the production mode are displaceable within the scope of the elasticity, which is preferably less than a millimeter.

A tool for injection molding plastic parts includes a static overall frame and two structural units for forming a cavity. One of the structural units is arranged displaceably relative to the overall frame and the other structural unit in order to remove an injection-molded part from the cavity. The static overall frame is formed by at least two frame units, in particular a first ejector-side tool element and a second nozzle-side tool element, which are displaceable relative to one another, but in the production mode are displaceable within the scope of the elasticity, which is preferably less than a millimeter.

Plural ejector pins are made to project before a molten resin containing reinforcing fibers is injected into an inside of a cavity through pin point gates in a web forming portion in the inside of the cavity and at positions outside the pin point gates in a radial direction. The ejector pins are retracted from the inside of the cavity after a flow of the molten resin containing reinforcing fibers injected into the inside of the cavity through the pin point gates impinges on the ejector pins and is divided and before a tooth portion forming portion in the inside of the cavity is filled with the molten resin containing reinforcing fibers. Accordingly, weld lines which extend along the radial direction are formed at positions outside the ejector pins in the radial direction, and the molten resin is filled in portions formed after the ejector pins are retracted.

Plural ejector pins are made to project before a molten resin containing reinforcing fibers is injected into an inside of a cavity through pin point gates in a web forming portion in the inside of the cavity and at positions outside the pin point gates in a radial direction. The ejector pins are retracted from the inside of the cavity after a flow of the molten resin containing reinforcing fibers injected into the inside of the cavity through the pin point gates impinges on the ejector pins and is divided and before a tooth portion forming portion in the inside of the cavity is filled with the molten resin containing reinforcing fibers. Accordingly, weld lines which extend along the radial direction are formed at positions outside the ejector pins in the radial direction, and the molten resin is filled in portions formed after the ejector pins are retracted.

A process of making a drag-reducing aerodynamic vehicle system includes injection molding a body configured for attachment to a roof of a vehicle with a sliding core, wherein the body comprises an air inlet extending through a surface of the body, wherein the air inlet includes an air guide boss extending from an interior surface of the body, wherein the air guide boss adjusts an air stagnation point away from the windshield to reduce air pressure and drag on the vehicle; and ejecting the drag-reducing aerodynamic vehicle system from the injection mold using the sliding core.

A process of making a drag-reducing aerodynamic vehicle system includes injection molding a body configured for attachment to a roof of a vehicle with a sliding core, wherein the body comprises an air inlet extending through a surface of the body, wherein the air inlet includes an air guide boss extending from an interior surface of the body, wherein the air guide boss adjusts an air stagnation point away from the windshield to reduce air pressure and drag on the vehicle; and ejecting the drag-reducing aerodynamic vehicle system from the injection mold using the sliding core.

A method for producing an injection-molded product is provided, where sunflower hulls are processed into sunflower hull fibers at a maximum temperature T.sub.PFmax of less than 200° C. Then an injection-moldable composite material is produced by mixing the sunflower hull fibers with a plastic material at a maximum temperature T.sub.PCmax ofless than 200° C. Next the produced injection-moldable composite material is automatically injection-molded into an injection-molding tool such that a molded composite material is produced. The composite material introduced into the injection-molding tool has a temperature T.sub.IM of more than 200° C. in at least one section of the injection-molding tool. Then the molded composite material is removed such that the injection-molded product is produced. A corresponding injection-molded product and the use of especially prepared sunflower hull fibers as an additive are also provided.

A method for producing an injection-molded product is provided, where sunflower hulls are processed into sunflower hull fibers at a maximum temperature T.sub.PFmax of less than 200° C. Then an injection-moldable composite material is produced by mixing the sunflower hull fibers with a plastic material at a maximum temperature T.sub.PCmax ofless than 200° C. Next the produced injection-moldable composite material is automatically injection-molded into an injection-molding tool such that a molded composite material is produced. The composite material introduced into the injection-molding tool has a temperature T.sub.IM of more than 200° C. in at least one section of the injection-molding tool. Then the molded composite material is removed such that the injection-molded product is produced. A corresponding injection-molded product and the use of especially prepared sunflower hull fibers as an additive are also provided.

Injection molding utilizing targeted heating of mold cavities when in a non-molding position, thereby facilitating enhancement of the appearance and strength of injection molding parts in a manner that does not significantly increase cycle times or energy consumption.

Injection molding utilizing targeted heating of mold cavities when in a non-molding position, thereby facilitating enhancement of the appearance and strength of injection molding parts in a manner that does not significantly increase cycle times or energy consumption.