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And heating the plastic machinery on the market at this stage of universal electric coil heating, contact conduction heat to the cylinder, and only close to the inside of the tube surface heat to spread to the barrel, so that the heat of the outsideMost dissipated into the air, there is a loss of heat conduction, and leading to the ambient temperature rises. In addition, the resistance wire heating Another disadvantage is the power density is low, unable to adapt in some need of high temperature heating applications. Electromagnetic heating technology is the metal barrel through electromagnetic induction principle of self-heating, and depending on the circumstances in the external barrel wrapped in a certain thickness of thermal insulation materials, thus greatly reducing heat loss, improved thermal efficiency, energy-saving effect very significant, up to 30% to 75%. Electromagnetic heating coil itself does not heat, and the manufacture of insulating material and high temperature cables, it does not exist under high temperature oxidation resistance wire like the original electric lap shortened life issues, has a long life, fast heating rate , no need maintenance, etc., reducing repair time and lower costs. Now the majority of the plastic products business use, greatly reducing the production costs.