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There are several kinds of spring heating coil, such as,round, square and rectangular. Polished and sandblasted finish are available for the outside surface.K.Jor E shape temperature controlling thermocouple canbe equipped as well. lt has many advantages，for example，small volume,high power density, rapid increase of temperature,precision control of temperature, long service life,convenient installation, energy saving,no pollutionand so on，which is widely used in hot runner plasticmold，blowing machine,extruding machine and hot nozzle.