Thermal designs and manufactures Mica band heaters, Ceramic heater bands, and Nozzle band heaters. Each mica band heater is manufactured to the specifications and might be shipped as soon as many off the shelf heaters when needed. Mica band heaters are used to heat cylinders including the barrels and nozzles of plastic injection and extruding machines.
Hopefully, you can get this info from your drawing, however if not, you are able to refer to the above mentioned graphic and easily make the own measurement (We simply need one of many dimensions). Next, determine the width of the heater and the size of the lead wire if appropriate.
Next, specify the wattage as well as the available voltage and you are ready to look! If you will find holes or notches in your band heater just click here for additional info on the way to measure heater bands.
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 greatly reduce the lifespan of your mica band heater. A little particle can leave an aura gap on both sides of itself which may result in a “hot spot.”
Air is not going to conduct the warmth out of your heater as fast as the metal of your barrel. This results in a spot around the heater where temperature will probably be significantly hotter than all of those other heater. Only a .005? air gap on the typical 30 watts per square in . heater can cause that spot to run 250 degrees (F) hotter!
After installing a brand new mica band heater, we propose that you just get back to it after quarter-hour of operating time. After proper actions are come to assure there is absolutely no power visiting the heater and this the heater is not going to cycle on, re-tighten your straps or clamping mechanism.
Produce a habit of checking the tightness of the band heater periodically and you will be blown away at ways to raise the life of your band heaters.
Each time you add a hole to a mica band heater, you provide another avenue for Contaminants to get in the heater. In addition, you add expense and frequently add to the delivery time.
If the hole is designed for a thermocouple or another instrument, it is possible to order a heater with a larger gap to accommodate the thermocouple. Another option in case the band heater has several holes along the circumference of your heater is by using two heaters as opposed to one. For example should you use a six inch wide heater with several one inch holes, you could possibly use two heaters that happen to be 2.5? wide.
When 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 will discover high temperature wire and ring terminals here.
When your mica heater bands or strip heater terminations are certainly not engrossed in a terminal box, think about using ceramic terminal covers. Dust, material or 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 velocity of heat being transferred through the top of the heater. Which is, if you decide to draw a 1”x1” square on the outside from the heater, how much heat would need to move through that 1 square in . area. This is known as watt density in fact it is measured as watts per square inch. Other items 40dexspky equal, the larger the watt density, the greater the temperature in the heater. As the temperature inside of the heater increases, the types of materials inside the heater are operating nearer to their breaking point resulting in shorter heater life. Generally, for satisfactory life in the mica band heater, the watt density needs to be lower than 50 watts per square in . for heater diameters lower than 3 inches, less that 40 watts per square inch 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 needs to be lower than 200 watts per square inch. For ceramic knuckle band heaters, the watt density must be under 35 watts per square inch. Also, higher operating temperatures require lower watt density for equivalent temperatures inside the heater and equivalent heater life.