Sprue Bushings, Heated Nozzles Enable High-Caliber Heat Transfer

Seeking to provide as much value to mold builders as possible, Fast Heat by Spark Industries is expanding its product line to include integrally heated sprue bushings and machine nozzles. This, says the company, enables tool shops and molders to leverage proven designs while receiving Fast Heat’s hands-on service and support. The company also offers custom mold boxes, mold and cable diagnostics, cables and Fast Heat Pulse and Ion hot runner
controllers.

Integrally heated sprue bushings have a high-caliber heat transfer and can process a wide range of resins. The streamlined flow channel terminates in a reverse taper gate, providing minimum pressure loss and 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.

Fast Heat notes that there is a replaceable type-J thermocouple located close to the flow channel. They are available in either a standard 0.500" or 0.750"
radius head or custom as requested. Gate options include a standard sprue for non-machined applications, extra stock for machining applications or a euro-style extra stock with a reduced gate diameter for use in restrictive areas and less heat loss.

Integrally heated machine nozzles also are reported to provide optimal heat transfer. Tip options include (1) general purpose for polystyrene (PS), polyethylene (PE) and polypropylene (PP) families, (2) full taper for ABS,
(PMMA) acrylic and polysulfone families and (3) nylon tip for nylon and acetal families.

Power leads are 90° standard, 45° optional or customized to the specific machine requirements. Standard thread sizes include 1 ¼-12 UNF, 1 ½ -12 UNF and 1 ¾-8 UNF. Metric or other sizes are available upon request. Flow
diameters are 0.500" standard or 0.750" end taper to a 0.500" flow channel.