| 摘要 |
PURPOSE: A heating hose having a dual structure is provided to improve the thermal transfer efficiency and elasticity and to prevent rust and scale generated in the inside of a pipe. CONSTITUTION: A manufacturing method of a heating hose having a dual structure which is used for a boiler comprises the steps for coating polybdenum having active agent rosin on the outer periphery of the inside of a heating pipe, forming the cross section of the heating hose at dual structure, and forming the whole outer periphery of the heating pipe as TPVC(Thermoplastic Elastomer Polyvinyl Chloride) made of rubber material.
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