Bushing for single-drop direct route

Small, single-drop direct parts and direct runner sprue gating are two areas where the integrally heated 750 hot sprue bushing from D-M-E (Madison Heights, MI) can benefit processors. Heat transfer capability has reportedly been enhanced via an integrally heated design, resulting in a more uniform heat profile. The bushing’s replaceable thermocouple, strategically located near the melt flow channel, optimizes processing conditions for a wide range of  thermoplastics, according to the supplier.

“The ability to eliminate sprues, reduce cycle times, and increase production are important capabilities all molders need in order to maintain a competitive advantage,” says Craig Kovacic, global manager of hot runner systems at D-M-E.

The medium-volume 750 bushing’s streamlined flow channel terminates in a reverse-taper gate, providing minimal pressure loss and allowing for rapid gate freeze. The formation of a small gate stub on the part or runner results in a machine hold-time reduction, with no increase in sink marks on the part.

With a 0.187-inch flow diameter, the 750 bushing is offered in two head styles and two gate styles to suit a broad range of applications. Other radius head options are available upon request. —[email protected]