STRAIGHT CARTRIDGE HEATER
» At high watt densities, a close fit is an important factor in determining the life expectancy of the heater.
» The fit is the difference between the heater diameter and diameter of the hole.
» A good fit is usually between 0.07mm to 0.15mm.
» Molds and Dies, Food Processing, Plastic Molding, Packaging Equipment, Hot Stamping, Plastic Extruders, Hot Runner Molds, Medical Equipment, Shoe Machinery
» A major factor in determining the life expectancy of a heating element its operating temperature.
» The heater life depends on the actual temperature of the resistance wire within the heater and not on the process operating temperature.
» A lower heater watt density is recommended when applications require high operating temperature.
Heater Watt Density
» Cartridge Heater Watt Density is defined as the wattage dissipated per square centimeter of the heated sheath surface.
» For a particular application, a heater watt density governs internal resistance wire temperature, which in turn determines the outer sheath temperature.
» These factors are critical to the proper heating and life expectancy of the heater.
» It is always advisable to use heaters that have watt densities below the maximum recommended watt density to get the longest heater life.
» For most general applications, it is recommended not to exceed a watt density of 20 watts / cm2.