Patent ID: 7211213

Claim:
A method for producing injection-molded parts with injection-molding materials of different viscosities, the method comprising: (i) providing an injection-molding tool for plastic materials, the tool comprising: at least one injection-molding nozzle system, equipped with a needle seal, wherein the system comprises a temperable nozzle body; a nozzle tip comprising an outlet opening and an inlet opening for a plastic mass; and a needle arranged in the nozzle body and axially displaceable between different positions in a longitudinal direction by an actuating apparatus; and at least one stroke limiter for directly determining a stroke of the needle, said stroke limiter comprising a conical section movable along a path perpendicular to an imaginary extension of the needle axis; wherein the needle comprises a needle tip and a needle shaft with at least one notch for the pass-through of the plastic mass; and wherein the nozzle tip is provided with a needle guide region for guiding the needle in radial directions; and (ii) controlling the flow rate through the nozzle body via the sum total of the free cross sections of each of the at least one notches in the cylindrical needle guide region, the shape of the notches and the setting of the stroke limiter at the opposite end of the needle.