Barrel Heaters - Hasmak.com.tr

Hot RunnerNozzle <strong>Heaters</strong>Thick Film NozzleThick Film Nozzle Heater Response TestThick Film vs. Axial Clamped Coiled CableElapsed TimeThick FilmHeater BacksideThick FilmHeated NozzleCableHeater BacksideCableHeated NozzlePrecise Wattage DistributionThick film nozzle heaters rated to 500˚C (932˚F) provide superiortemperature uniformity by putting the energy exactly where it is needed.Temperature distribution using standardcoiled cable heater.0.787 mm(0.031 in.)Typ.9.525 mm(0.375 in.)No-heatLead Termination RingTemperature distribution using thick filmheating technology.9.525 mm(0.375 in.)No-heatLead Termination RingWatlow thick film technology heatersoffer distinct <strong>com</strong>petitiveadvantages over coiled cable heatertechnology:1. Uniform temperature profile2. No requirement for clamping ofthe heater3. High dielectric barrier withagency approvals eliminatesneed for soft start4. Lower heater operatingtemperatures5. Precise and repeatable wattagedistribution6. Increased controllability of system7. Increased productivity throughdecreased set-up time8. Design allows thermocouple tobe directly immersed into nozzlebody. Replaceable option toaccurately measure melttemperature – not the heater.9. Low profile design allows forlarger nozzle with higher feed intoa smaller hole. Also, the waterjacket can be closer to the nozzleproducing better control andhigher yield.0.787 mm(0.031 in.)Heater ID+7.6 mm(0.300 in.)Zone A Wattage Zone B Wattage Zone C WattageZone AWattageZone BWattageInstallationThe thick film nozzle heaters aredesigned with the optimum diametricclearance of 0.038 mm (0.0015 in.)above the actual nozzle. Thisclearance allows for easy insertionand removal of the heater andexcellent heat transfer without theneed for clamping, anti-seize or heatsink <strong>com</strong>pound with the thick filmnozzle heater.128Nozzle surface preparation may benecessary if the nozzle has anysurface contamination or otherirregularities. Cleaning of the usednozzle body surface is easily ac<strong>com</strong>plishedwith light sand blasting of thesurface and then a light buffing ofthe surface with a piece of emerycloth. After the cleaning operationthe nozzle heater should slip on andoff very easily. Forcing a heater on toa nozzle may result in heater damageand possible failure after it has beenin operation.Do not use anti-seize or heat sink<strong>com</strong>pound with thick filmnozzle heaters.