采用镍铬丝作发热材料，用云母软板作绝缘材料，外包以薄金属板。 云母加热圈内有高绝缘耐火的云母绕上电热丝，电热丝芯的两端有良好的绝缘耐火层，先制成平板，再用机械绞制成型。由于云母加热圈采用云母为原料，在制作上不受规格大小的限制既可以做射嘴用的小规格加热，又可以作塑胶机炮筒上的加热。云母加热圈具有结构合理，外形美观，性能稳定，加热均匀、散热快，使用寿命长，绝缘性能良好，耐高压等特点。

       The use of nickel chrome wire for heating materials, with mica soft board for insulating materials, outsourcing to thin metal plate. Mica heating ring with high insulation and fire-resistant mica around the electric wire, electric wire core at both ends of a good insulation refractory layer, first made of flat, and then mechanical twisted molding. As the mica heating ring using mica as raw material, in the production of the size of the restrictions can not only use the nozzle with a small size of heating, but also for the plastic machine barrel heating. Mica heating ring with a reasonable structure, beautiful appearance, stable performance, heating evenly, fast heat, long life, good insulation properties, high pressure and other characteristics.