Thermal designs and manufactures Mica band heaters, Ceramic heater bands, and Nozzle band heaters. Each mica band heater is manufactured to your specifications and can be shipped as quickly as many out of the box heaters if needed. Mica band heaters are utilized to heat cylinders such as the barrels and nozzles of plastic injection and extruding machines.
Hopefully, you can get this info from your drawing, but when not, you can refer to the above graphic and easily create your own measurement (We merely need one of many dimensions). Next, determine the width of the heater and the duration of the lead wire if appropriate.
Afterward, specify the wattage as well as the available voltage and you are prepared to look! If you will find holes or notches inside your band heater click this link for additional info on the way to measure this heat band.
When replacing a mica band heater make sure that the barrel or nozzle is provided for free of material, smooth and clean.
A rough spot or foreign material about the barrel can help reduce the lifestyle of your own mica band heater. A small particle can leave an air gap on either sides of itself which could create a “hot spot.”
Air will never conduct the high temperature out of your heater as quickly as the metal of the barrel. This results in a spot around the heater the location where the temperature will probably be significantly hotter than all of those other heater. Only a .005? air gap over a typical 30 watts per square inch heater will cause that location to run 250 degrees (F) hotter!
After installing a whole new mica band heater, we propose that you come back to it after quarter-hour of operating time. After proper actions are taken up assure there is not any power visiting the heater and this the heater is not going to cycle on, re-tighten your straps or clamping mechanism.
Make a practice of checking the tightness from the band heater periodically and you will probably be surprised at how you can raise the lifetime of your band heaters.
Every time you put in a hole into a mica band heater, you give another avenue for Contaminants to enter the heater. You additionally add expense and often improve the delivery time.
If the hole is designed for a thermocouple or another instrument, you can often order a heater having a larger gap to support the thermocouple. Another option in the event the band heater has several holes over the circumference in the heater is by using two heaters rather than one. As an illustration should you use a six inch wide heater with several one inch holes, you could possibly try using two heaters that happen to be 2.5? wide.
In case your mica band heaters has post terminals, ensure you are using high temperature ring terminals. Standard ring terminals will cook to the stage they become brittle and may easily break resulting in a short. You will discover high temperature wire and ring terminals here.
Should your mica heater bands or strip heater terminations usually are not engrossed in a terminal box, consider utilizing ceramic terminal covers. Dust, material or any other contaminates can build quickly on and round the connections eventually carbonizing which will short the mica heater bands and cause downtime.
Watt density is a way of measuring the rate of heat being transferred throughout the top of the heater. That is certainly, if you were to draw a 1”x1” square on the surface of the heater, exactly how much heat will need to go through that 1 square in . area. This is known as watt density which is measured as watts per square in .. Other activities 40dexspky equal, the larger the watt density, the larger the temperature within the heater. As the temperature inside the heater increases, the materials in the heater are operating nearer to their breaking point contributing to shorter heater life. Generally, for satisfactory life within a mica band heater, the watt density must be under 50 watts per square in . for heater diameters less than 3 inches, less that 40 watts per square in . for band heaters with diameters between 3 and 6 inches and fewer than 35 watts per square inch for mica bands with diameters between 6 and 10 inches. For cartridge heaters, the watt density must be under 200 watts per square in .. For ceramic knuckle band heaters, the watt density must be lower than 35 watts per square in .. Also, higher operating temperatures require lower watt density for equivalent temperatures within the heater and equivalent heater life.