This is a cylindrical heater insulated with mica plates and covered with metal plates (stainless steel or bonded steel). Lightweight, thin, elastic, and with a smooth inner surface, it can be completely attached to the cylindrical object to be heated and can be heated efficiently. By attaching a heat-retaining cover, it is possible to prevent unnecessary heat radiation and increase energy saving effects.
Purpose
Ideal for heating cylinder nozzles of extruders and molding machines for synthetic resins, rubber, etc., and cylindrical objects to be heated.
Permitted Watt Density Table
We can design various sizes and capacities according to your needs, but there are limitations on the watt density due to the heater’s lifespan. (See the table of allowable watt densities.)
*What is watt density?
Watt density is the heater capacity (wattage) divided by the heater surface area, i.e., the wattage per unit surface. It is expressed in W/cm².
The heater surface area of a band heater is the area in contact with the heated object, and for a space heater, it is the area of one side. For rod-shaped cartridge heaters and sheathed heaters, it is the total surface area. As the watt density increases, the surface temperature increases and the heater life becomes shorter.
kinds Heated object Allowable watt density (w/cm²)
Band Heater metal 4.0
space heater metal 4.0
Cartridge heater metal 8.0
Sheathed heater metal 8.0
gas 3.0
water 8.0
Watt Density Formula (How to Calculate Wattage)
(Example) The wattage of a 1P band heater with an inner diameter of φ150mm and width of 50mm can be calculated
as 15 (inner diameter: cm) x 3.14 (pi) x 5 (width: cm) x 4 (watt density) = 942, which is approximately 900W.
