Thermal designs and manufactures Mica band heaters, Ceramic heater bands, and Nozzle band heaters. Each mica band heater is manufactured to your specifications and may be shipped as soon as many off the shelf heaters as needed. Mica band heaters are utilized to heat cylinders like the barrels and nozzles of plastic injection and extruding machines.
Hopefully, you can get this information from the drawing, but if not, you are able to reference the above graphic and simply make your own measurement (We merely need one of the dimensions). Next, determine the width of the heater and the length of the lead wire if appropriate.
Following that, specify the wattage along with the available voltage and you are prepared to visit! If there are actually holes or notches in your band heater click here for more information on the way to measure band heaters.
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 help reduce the lifestyle of the mica band heater. A tiny particle can leave an aura gap on either sides of itself that may create a “hot spot.”
Air is not going to conduct the high temperature away from your heater as quickly as the metal of the barrel. This results in a spot on the heater the location where the temperature will be significantly hotter than the remainder of the heater. Just a .005? air gap over a typical 30 watts per square inch heater will result in that spot to run 250 degrees (F) hotter!
After installing a new mica band heater, we suggest that you come back to it after 15 minutes of operating time. After proper actions are taken up assure there is absolutely no power seeing the heater and this the heater will not cycle on, re-tighten your straps or clamping mechanism.
Make a habit of checking the tightness of your band heater periodically and you will probably be surprised at tips on how to boost the life of your band heaters.
Every time you add a hole to a mica band heater, you give another avenue for Contaminants to get in the heater. You also add expense and frequently enhance the delivery time.
If the hole is for a thermocouple or other instrument, you can often order a heater with a larger gap to accommodate the thermocouple. An alternative choice when the band heater has several holes across the circumference of the heater is to use two heaters as an alternative to one. For instance should you use a six inch wide heater with several one inch holes, you could possibly try using two heaters that are 2.5? wide.
Should your mica band heaters has post terminals, make sure you are using high temperature ring terminals. Standard ring terminals will cook to the point they become brittle and will easily break resulting in a short. You will find high temperature wire and ring terminals here.
When your mica heater bands or strip heater terminations are certainly not covered with a terminal box, consider using ceramic terminal covers. Dust, material or other contaminates can build quickly on and around the connections eventually carbonizing that can short the mica heater bands and cause downtime.
Watt density can be a way of measuring the pace of warmth being transferred from the top of the heater. That is, if you draw a 1”x1” square on the surface from the heater, how much heat would have to pass through that 1 square inch area. This is called watt density and it is measured as watts per square in .. Other activities 40dexspky equal, the larger the watt density, the better the temperature in the heater. Because the temperature within the heater increases, the type of material inside the heater are operating closer to their breaking point leading to shorter heater life. Generally, for satisfactory life inside a mica band heater, the watt density should be lower than 50 watts per square in . for heater diameters below 3 inches, less that 40 watts per square inch for band heaters with diameters between 3 and 6 inches and much less than 35 watts per square in . for mica bands with diameters between 6 and 10 inches. For cartridge heaters, the watt density must be less than 200 watts per square in .. 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.