Sprue system for injection-molding processes

A sprue system comprising:

• an injection-molding tool;
• a sprue piece comprising a tube portion and a flange portion, wherein the spruce piece defines at least a portion of a runner of the injection-molding tool and the flange portion comprises a flange through-opening and a flange threaded bore;
• a fastener assembly attached to the sprue piece and configured for fastening the sprue piece to the injection-molding tool, wherein the fastener assembly comprises a tube portion lead-through, a fastening screw, and an adjusting screw, the tube portion lead-through defining delimiting walls that surround the tube portion of the sprue piece and an internal threaded bore corresponding to the flange through-opening, the fastening screw being disposed in the flange through-opening, and the adjusting screw being engaged with the flange threaded bore;
• wherein the sprue piece is attached to the fastener assembly via the fastening screw disposed in the flange through-opening of the flange portion and engaged with the internal threaded bore of the fastener assembly;
• and
• the sprue piece and the fastener assembly are adjustable in relation to one another such that a distance (A) between the flange portion of the sprue piece and the fastener assembly is set.

An assembly method for attaching and adjusting a sprue piece to an injection-side nozzle arrangement of an injection-molding tool, the assembly method comprising:

• assembling a sprue system comprising:
• the sprue piece, wherein the sprue piece comprises a tube portion and a flange portion with a plurality of through-openings and a plurality of flange threaded bores;
• a fastener assembly comprising a tube portion lead-through, a plurality of internal threaded bores corresponding to the plurality of flange through-openings, and a plurality of fixing device through-bores;
• and
• a plurality of adjusting screws, a plurality of fastening screws, and a plurality of fixing screws;
• disposing the plurality of adjusting screws in the plurality of flange threaded bores for setting a distance (A) between the flange portion of the sprue piece and the fastener assembly;
• disposing the tube portion of the sprue piece into the tube portion lead-through of the fastener assembly;
• fastening the sprue piece to the fastener assembly by disposing the plurality of fastening screws in the plurality of through openings and engaging the plurality of fastening screws with the plurality of internal threaded bores, wherein the distance (A) is set between the flange portion and the fastener assembly;
• and
• fastening the fastener assembly to the injection-molding tool by disposing the plurality of fixing screws into the plurality of the plurality of fixing device through-bores and engaging the plurality of fixing screws with a plurality of blind-hole bores in the injection-molding tool.