COIL HEATERS
Coil heaters or otherwise known as sprue bushing heaters are electric resistance heaters which are composed of a straight or wire wound miniature helical coil resistance wire, magnesium oxide (MgO) insulation, a thin sheath metal shell (usually stainless steel that is later annealed) and a transition piece that connects the power and thermocouple leads to the heater.
Coil Heater is a small, linear heating element that can be formed into different shapes and configurations. Also known as a Hot Runner Heater for its extensive use in Hot Runner Systems, the Micro Tubular Coil Heater is a high performance heater which allows high wattage in a limited space.
The ability to shape a Hot Runner Heater when cold enables to heat up parts with different shapes. During coiling, the gap between turns of coil can be modified to compensate for the heat losses at each end of the coil or to insert the heating element into slots.
Types of coil heaters
Coil heater with clamp
Axial clamp mini coil heaters are a proven performer for high cavitation applications including pre-forms, caps and closures, and razors. axial clamp heaters positively lock on the nozzle ensuring excellent heat transfer and durability. Adjustments can be made with a single front facing allen screw, greatly simplifying tightening and removal.
Hot runner coil heater
Hot runner heater within 20-3000mm is mainly used for hot runner mold or, as well as other precision heating system. Spring heating ring external using high quality Ni-Cr steel tube, the internal use of high purity magnesium oxide , high temperature resistance wire, and first-class manufacturing technology . The wire is after the annealed, with flexibility can be bent into an arc or circle heating. Its high working temperature, fast heating, uniform heating precision, long service life, can be automatically controlled area, high thermal conduction, while internal heating material damage, external can be reuses.