Thermal designs and manufactures Mica band heaters, Ceramic heater bands, and Nozzle band heaters. Each mica band heater is manufactured in your specifications and can be shipped as quickly as many off the shelf heaters when needed. Mica band heaters are employed to heat cylinders like the barrels and nozzles of plastic injection and extruding machines.
Hopefully, you can get this information from your drawing, however, if not, you may make reference to the aforementioned graphic and easily make your own measurement (We only need one of the dimensions). Next, determine the width in the heater and the length of the lead wire if appropriate.
After that, specify the wattage along with the available voltage and you are ready to visit! If there are actually holes or notches inside your band heater just click here for additional information on how you can measure mica band heater.
When replacing a mica band heater make sure that the barrel or nozzle is free of material, smooth and clean.
A rough spot or foreign material about the barrel can greatly reduce the life span of the mica band heater. A little particle can leave an aura gap on both sides of itself which may create a “hot spot.”
Air is not going to conduct the high temperature out of your heater as quickly as the metal from the barrel. This generates a spot on the heater in which the temperature will be significantly hotter than the other heater. Simply a .005? air gap on a typical 30 watts per square in . heater can cause that spot to run 250 degrees (F) hotter!
After installing a whole new mica band heater, we recommend that you simply revisit it after quarter-hour of operating time. After proper actions are taken to assure there is absolutely no power visiting the heater which the heater will not likely cycle on, re-tighten your straps or clamping mechanism.
Produce a practice of checking the tightness in the band heater periodically and you will definitely be amazed at ways to improve the life of your band heaters.
Each time you include a hole to your mica band heater, you give another avenue for Contaminants to penetrate the heater. You also add expense and frequently improve the delivery time.
In the event the hole is perfect for a thermocouple or some other instrument, you can often order a heater by using a larger gap to support the thermocouple. Another choice when the band heater has several holes down the circumference of the heater is to apply two heaters as opposed to one. As an example if you are using a six inch wide heater with several one inch holes, you may try using two heaters that happen to be 2.5? wide.
If your mica band heaters has post terminals, ensure you are using high temperature ring terminals. Standard ring terminals will cook to the level they become brittle and will easily break resulting in a short. You can get high temperature wire and ring terminals here.
If your mica heater bands or strip heater terminations are not covered with a terminal box, think about using ceramic terminal covers. Dust, material or other contaminates can build quickly on and round the connections eventually carbonizing that can short the mica heater bands and cause downtime.
Watt density can be a measure of the rate of warmth being transferred throughout the top of the heater. That is, should you draw a 1”x1” square at first glance of your heater, simply how much heat will have to go through that 1 square inch area. This is known as watt density and is particularly measured as watts per square in .. Other items 40dexspky equal, the better the watt density, the greater the temperature within the heater. Since the temperature inside of the heater increases, the materials inside of the heater are operating closer to their breaking point leading to shorter heater life. Generally, for satisfactory life in a mica band heater, the watt density should be less than 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 in . for mica bands with diameters between 6 and 10 inches. For cartridge heaters, the watt density ought to be lower than 200 watts per square in .. For ceramic knuckle band heaters, the watt density should be less than 35 watts per square in .. Also, higher operating temperatures require lower watt density for equivalent temperatures inside of the heater and equivalent heater life.