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Hot Runners 14 MoldMaking Technology —— APRIL 2017 are currently using engineering polymers could benefit from a switch to a hot runner system. Converting production from a cold runner to a hot runner and direct-gating high-temper- ature polymer plastic parts can yield a savings of as much as 50 percent, which includes savings from resin waste, energy, labor and the mold. A key development in the molding of high-temperature polymers was the introduction of polyaryletherketones (PAEK), a family of semi-crystalline thermoplastics with high- temperatures. Polyetheretherketone (PEEK) belongs to this family and is one of the more popular engineering resins because of its thermal stability (viable at temperatures rang- ing to 260ºC/500ºF); high strength-to-weight ratio; resistance to impact, chemicals and radiation; and dimensional stability. This makes it an optimal choice for complex part geometries with thin cross sections. Valve Gate Standard FIGURE 2 When gating PEEK parts, consider valve gates and standard thermal sprue gates, because the gate area is maintained at a higher temperature as the melt heat is brought to the gate via the nozzle/valve stem or the gate tip. FIGURE 3 This offset manifold with a through-bore-tip-gate style is suitable for semi-crystalline resins such as PEEK, because it has no material insulation area and conducts heat into the gate through the nozzle, keeping it warm. For the toughest jobs & finest details, manufacturers rely on Crystallume. www.crystallume.com When it comes to hard milling, our DEMON line delivers unparalleled performance. Machining graphite, and need an extremely sharp cutter? Choose our STEALTH & LIGHTNING lines. To learn more, call 1-800-789-4322 Graphite? Hard Metal? ©2017 Crystallume DIAMOND DONE RIGHT Made in the U.S.A.