| 摘要 |
PURPOSE: A sheet type magnetic heater is provided to reduce an error rate in a manufacturing process and maximize heating efficiency by changing orders of manufacturing processes. CONSTITUTION: A heating composition is formed by mixing the remaining elements except for water(S10). The heating composition is inserted into an airtight film or an airtight sheet and an entrance of the airtight film or the airtight sheet is closed(S12). The airtight film or the airtight sheet is formed with a laminated material of one or more elements selected from a group including PET, PP, PVC, PU, PS, PC, PETG, EVOH, PE and nylon. A multitude of fine aperture is formed on one side or both sides of the airtight film or the airtight sheet and water is injected into the fine apertures of the airtight film or the airtight sheet(S14). The airtight film or the airtight sheet is inserted into an airtight envelope and the envelope is sealed(S16).
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