Injection molding tool and method for the production thereof, and method for producing marbled molded parts

An injection mold for production of marbled moldings, comprising

• at least one hot runner, a cavity, an entry opening into the injection mold and an inlet into the cavity, wherein the hot runner has at least two ducts that are connected at a first end of each duct to the inlet into the cavity and at a second end of each duct to the entry opening into the injection mold, wherein the at least two ducts each at least partly form a spiral and the at least two ducts are bounded by a one-piece component, and wherein the at least two ducts are separated from one another between their first end and their second end by the one-piece component, wherein the at least two ducts each have a center axis, and the center axis is arranged in the form of the spiral around a longitudinal hot runner axis, and the spiral has different slopes at each of at least two different positions.

A process for producing an injection mold for production of marbled moldings, comprising at least one hot runner, a cavity, an entry opening into the injection mold and an inlet into the cavity, wherein the hot runner has at least two ducts that are connected at a first end of each duct to the inlet into the cavity and at a second end of each duct to the entry opening into the injection mold, wherein the at least two ducts each at least partly form a spiral and the at least two ducts are bounded by a one-piece component, and wherein the at least two ducts are separated from one another between their first end and their second end by the one-piece component, wherein at least the one-piece component is produced by additive method.

A process for producing marbled moldings, wherein a first molding compound and at least one further molding compound are each added separately in time and/or space to an injection unit of a screw injection molding machine and injected from the injection unit of the screw injection molding machine into an injection mold,

• wherein the injection mold comprises at least one hot runner, a cavity, an entry opening into the injection mold and an inlet into the cavity, wherein the hot runner has at least two ducts that are connected at a first end of each duct to the inlet into the cavity and at a second end of each duct to the entry opening into the injection mold, wherein the at least two ducts each at least partly form a spiral and the at least two ducts are bounded by a one-piece component, and wherein the at least two ducts are separated from one another between their first end and their second end by the one-piece component.