Barrel Heaters - Hasmak.com.tr

Fit in Hole—inchesW A T L O WHot RunnerNozzle <strong>Heaters</strong>Metric EB CartridgeApplications andTechnical DataContinuedMaximum Allowable Watt DensityBoth the Maximum Allowable WattDensity metric and inch-base chartswill tell you either the hole fit orre<strong>com</strong>mended watt density inrelationship to part temperature.Enter the chart with either knownvariable, part fit in hole dimension orwatt density. Then find the parttemperature by reading up or overon the chart. The part temperaturecurves shown are measured13 mm (0.5 in.) from the heater in amild steel block. For stainless steelblocks, enter the graph with a fit of0.04 mm (0.0015 in.) larger thanactual. For aluminum and brassblocks, enter the graph with atemperature 55°C (100°F) aboveactual block temperature.On-Off Cycling: On-off cyclingshortens heater life. If the heatercycles more than once per hour,multiply the watt density, shown onthe chart, by 0.8 to determine themaximum allowable watt density forthe application. If the heater cyclesmore than once a minute, multiplyby 0.7.Fit in Hole—mm2.52.01.00.50.250.10.050.0100.100.050Maximum Allowable Watt Density100°C (212°F)300°C (572°F)400°C (752°F)500°C (932°F)600°C (1112°F)200°C (392°F)1 2 3 4 5 10 15 20 30 40 50Watt Density—W/cm 2Maximum Allowable Watt DensityInjection MoldingHot Runner Nozzle <strong>Heaters</strong>0.020TolerancesDiameter: -0.02 mm, -0.08 mm(-0.0008 in., -0.0031 in.)0.010Length: ±3 percent with ±2.4 mm(±0.0937 in.) minimumResistance: +5 percent, -10percent. Resistance is measured0.005at room temperature following firstheater operation.Wattage: +10 percent, -5 percent.Wattage decreases approximately0.0025 percent with temperature.Wattage tolerances are forheaters at operating temperature.0.00110 20 40 60 80 100 200 300593°C (1100°F)482°C (900°F)371°C (700°F)260°C (500°F)Watt Density—W/in 293°C (200°F)113