| 摘要 |
PURPOSE:To permit smooth hot gluing by heating of one time by a method wherein a cylindrical side wall whose lower end plate is bonded through hot gluing is hung in reverse and a foldable heat bonding jig is abutted from the inside thereof to effect hot gluing. CONSTITUTION:A lower end plate 2 is bonded to one end of a cylindrical side wall 1 through hot gluing, thereafter, the cylindrical side wall with the lower end plate 2 is hung in reverse while foldable circular heat bonding jigs 4, 8, 9 are abutted against the lower inner peripheral surface of the cylindrical side wall 1 to shape the inner peripheral surface. Subsequently, the peripheral rim of an upper end plate 5 is arranged at a predetermined position to bond the peripheral rim of the side wall 1 to the peripheral rim of the upper end plate 5 through heat bonding. A tube, obtained by inflation method, is used as the cylindrical side wall usually. The annular bonding jig is made foldable into even number of foldings, such as two or four foldings and the like, by hinges 8 while a rubber type heat resistive elastic body 9 is bonded to the outer peripheral surface thereof. According to this method, smooth heat bonding may be effected without generating any wrinkle at the part of the heat bonding when the part of welding is heated by abutting a hot plate or the like against the outer peripheral surface of the peripheral rim of the upper end plate 5. |
