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The thermoplastic preheater is one of the main equipment for the construction of a hot melt marking line. During marking construction, the powder coating shall be heated and stirred by a hot-melt kettle until the hot-melt becomes liquid, and then the coating shall be put into the marking machine for marking construction. As the melting quality of the coating is directly related to the marking quality, the hot-melt kettle is the key component of the hot-melt marking equipment. It is an essential part of the melting of coatings.