Thermal designs and manufactures Mica band heaters, Ceramic heater bands, and Nozzle band heaters. Each mica band heater is manufactured for your specifications and might be shipped as quickly as many off the shelf heaters if needed. Mica band heaters are widely used to heat cylinders such as the barrels and nozzles of plastic injection and extruding machines.
Hopefully, you will get this data from a drawing, but if not, it is possible to talk about the aforementioned graphic and easily make your own measurement (We merely need one of the dimensions). Next, determine the width from the heater and the size of the lead wire if appropriate.
After that, specify the wattage and the available voltage and you are ready to visit! If you will find holes or notches inside your band heater just click here for additional info on the best way to measure mica band heater.
When replacing a mica band heater make sure that the barrel or nozzle is free of charge of material, smooth and clean.
A rough spot or foreign material on the barrel can greatly reduce the life span of your own mica band heater. A tiny particle can leave an air gap on either sides of itself which could cause a “hot spot.”
Air will not likely conduct the temperature from your heater as quickly as the metal of the barrel. This generates a spot in the heater the location where the temperature will be significantly hotter than the rest of the heater. Simply a .005? air gap on a typical 30 watts per square inch heater will result in that location to run 250 degrees (F) hotter!
After installing a whole new mica band heater, we recommend that you come back to it after fifteen minutes of operating time. After proper actions are come to assure there is absolutely no power going to the heater and this the heater will never cycle on, re-tighten your straps or clamping mechanism.
Produce a habit of checking the tightness of your band heater periodically and you will definitely be amazed at how you can increase the lifetime of your band heaters.
Each and every time you include a hole into a mica band heater, you allow another avenue for Contaminants to get in the heater. You additionally add expense and sometimes increase the delivery time.
When the hole is designed for a thermocouple or some other instrument, you can often order a heater using a larger gap to accommodate the thermocouple. Another choice in the event the band heater has several holes across the circumference of your heater is to use two heaters as opposed to one. For instance if you work with a six inch wide heater with several one inch holes, you may use two heaters that happen to be 2.5? wide.
In case 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 may easily break resulting in a short. You can find high temperature wire and ring terminals here.
If your mica heater bands or strip heater terminations are not covered with a terminal box, consider utilizing ceramic terminal covers. Dust, material or some other contaminates can build quickly on and round the connections eventually carbonizing that can short the mica heater bands and cause downtime.
Watt density is a measure of the pace of warmth being transferred from the surface of the heater. That is, if you decide to draw a 1”x1” square on the outside from the heater, how much heat would need to pass through that 1 square inch area. This is known as watt density in fact it is measured as watts per square in .. Other stuff 40dexspky equal, the better the watt density, the higher the temperature inside the heater. Because the temperature within the heater increases, the materials in the heater are operating even closer to their breaking point resulting in shorter heater life. Generally, for satisfactory life inside a mica band heater, the watt density ought to be less than 50 watts per square inch 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 must be below 200 watts per square in .. For ceramic knuckle band heaters, the watt density ought to be below 35 watts per square inch. Also, higher operating temperatures require lower watt density for equivalent temperatures within the heater and equivalent heater life.