In recent years, the thinking has increasingly changed that real-time cavity information could be used during the filling process as an effective substitute for product quality data. Belt heaters and cartridge heaters are very similar in design and application. Strip heaters, on the other hand, use a straight design and often have slats to heat the ambient air. In harsh environments, these heaters can be sealed and built with various elements for a more durable design.
Mica belt heaters are widely used in the plastic extrusion industry, but can also be used for other applications with maximum temperatures below 1000°F. MPI has a large stock of mica belt heaters for same-day delivery. Customer-specific solutions are also available for fast delivery if required. Hi-Watt Inc. supplies heating systems and products for various industries throughout Michigan.
In general, heating absorbs electrical energy and converts it into heat. The temperature controller turns the heating on or off after comparing the preset target temperature with the actual process temperature supplied by the temperature sensor. However, temperature controllers cannot change the high current loads required by most heaters. For all but the smallest heaters, the system should include a load handling device such as a power regulator, SSR, SCR (silicon-controlled rectifier) or a mechanical relay. These electronic switchgear are able to process a large current and act according to the commands of the temperature controller. Standard Backer Hotwatt belt heaters are manufactured in one- or two-piece constructions with maximum inner diameters of 11 1/2″ or 22 1/2″.
Tempco ceramic belt heaters have become extremely popular with OEMs as standard heaters for the drums of plastic injection molding machines, extruders and blow molding lines. A thin layer of the thermally conductive “high” MI material is used to electrically insulate the element wire from the inner diameter of the heater cover. A thicker, “lower” thermally conductive layer supports the elemental wire by directing the heat inwards to the part to be heated. The result is more efficient heat transfer, which lowers the temperatures of the element cable and increases the service life of the belt heating.
If possible, it is also recommended to specify tape clamping devices to keep the heater in place. These devices have a lower thermal expansion rate than the heater, so they can help keep the heater firmly running during operation. There are two steps you can take to ensure good contact with the machine running. First, make sure that the measurement of the outer diameter of the machine run is accurate. The manufacturer of the heater takes into account a space of 0.25 “, so it is not necessary to reduce the dimensions of the belt. Until recently, most processors felt that if individual machine parameters could be stabilized with effective process control loops, there was no real need to integrate product data.
However, these standard variants and terminations of the Duraband heater do not represent the scope of our capabilities. Ceramic belt heaters consist of a resistance cable that is inserted into a ceramic core. These central elements are hinged, which gives the heating tape a high degree of flexibility. By far the most common culprit for the failure of belt heaters is environmental pollution. Liquid plastic, hydraulic oil and moisture are three main causes of premature contamination errors. Of course, keeping heaters free of contaminants will reduce failure and replacement rates.
There are currently around 50 licensees operating 260 machines in 10 countries. When it’s time to replace or renew the tool, lightweight weighing designs should be ready to be implemented into the new tool. In the cycle time of 7 s, 1 g of reduced resin saves more than 500 Industrial Band Heater Manufacturer g of resin per hour and cavity. At current prices, this saves about 0.85 $h and you can collect more than 8000 hours of just 1 year at $6800, which costs one tool per cavity. This means that the tool is already paid within the first year and benefits for another year.
Strip heaters are used when there is a flat surface or the plate needs to be heated. Each configuration has several different options that can be added or changed depending on your needs. Negative heat transfer would be the case if the temperature value of an extruder zone is higher than the setpoint. In this case, the friction inside the barrel is so high that it actually needs to overheat and cool the barrel to maintain the selected temperature.