| 摘要 |
PURPOSE:To coat a sheet preventing the slip of an overlapped part, by a method wherein a gunpowder layer is formed on the overlapped part of thermoshrinkable sheets and said layer is burnt. CONSTITUTION:A thermoshrinkable sheet 2 is wound around a steel pipe 1 so that an adhesive layer 3 becomes the inside and one end part 21 becomes the front, laminated sheet 4 is overlapped on an overlap part of the thermoshrinkable sheet 2 so that a steel plate 41 is abutted against the thermoshrinkable sheet 2 and a gunpowder layer 42 is ignited. When the gunpowder layer is ignited, as the thermoshrinkable sheets right under the laminated sheet 4 are welded each other through combustion heat of the gunpowder the laminated sheet 4 is peeled off after cooling, and the whole of the thermoshrinkable sheet is heated and made to contact by a burner. A pinching jig may be used to make welding of the thermoshrinkable sheets 2 far reliable. |
