What is preheating machine for melamine powder?
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Preheating machine, also named high-frequency machine is used for melamine tableware making.
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The heart part of the preheater is called vaccum tube, which is made in Japan originally.
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The earlier brand of the vaccum tube for preheating machine is Toshiba, now the brand is Canon.
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Original vacuum tube could work for a longer time if operate properly.