Three or more sections are used when larger diameter heaters are needed. The thickness of each layer of mica is carefully selected to balance between the insulating properties of the mica and the ease of heat transfer from the heating core to the machine running. The mica insulation offers a slim design, maximum watts of 3.5 W/cm² and operation of up to 380 °C. For process temperatures above 280°, ceramic insulation is preferred. Good thermal contact between the element and the metal surface to be heated is essential.
This usually happens at the end of the run in the so-called screw measuring zone. Most of the heat (about 70%) comes from the inlet temperature of the pellet and the friction. The operator has control over the heat, the rotation speed of the screw and the back pressure during the rotation of the screw, which is called recovery. Mica belt heaters are our most widely used belt heater due to their versatile design and robust construction features.
All materials have proposed maximum wattage densities beyond which the material will burn. Mi-Plus belt heaters are suitable for temperatures up to 760 °C (1400 °F) and wattage densities of up to 23.25 W/cm2 (150 W/in2). The result is more efficient heat transfer, which lowers Industrial Band Heater Manufacturer the temperatures of the element cables and increases the service life of the heating. Backer Marathon Starflex belt heaters are the most robust and reliable belt heaters on the market. They are the original tape of the aluminum housing and remain the industry standard.
Alternatively, a belt heater can be used that resists contamination. Problems with belt heating and the resulting downtime should be kept to a minimum when maintenance and engineering personnel have to meet all other requirements of their time. At the same time, market forces are driving injection molders to deliver products on time and error-free, other factors that require smooth operation of the belt heater. Understanding the options for belt heaters, design considerations, performance expectations, and methods of loss prevention is critical to smooth operation. The soaking time may be available on some machines and is the time between the time when the last belt of the heater has reached its set point and the time when the machine starts the extruder. The soaking time is different for the extruder and the hot runner.
For the processor, this means that the higher the running inlet temperature, the less power the process requires. Therefore, there is a strong argument for using the latest drying technology, which makes it possible to adjust the residence time at the output to have the most profitable operation. Maxi straps can be designed as Heat and Cool, Heat Only or Cool Only. Starflex belt heaters can be used in many different applications, including plastic extrusion and injection molding, and have an excellent lifespan with little to no downtime. Mica belt heaters are very often used in the plastics industry for injection extrusion and blow molding. The heater sits on cylindrical metal pipes or a barrel to heat the contents of a solid onto molten liquid.
MPI Morheat is a manufacturer of ceramic belt heaters typically used for plastic extrusion, injection molding and blow molding. Ceramic belt heaters are a powerful alternative to standard mica coil heaters. MPI ceramic belt heaters are insulated with high-quality ceramic fibers and offer first-class thermal efficiency. This results in a durable heater that can withstand operating temperatures up to 1400°F. All MPI ceramic belt heaters have a stainless steel outer shell for optimum oxidation resistance.