| 摘要 |
PURPOSE:To manufacture a lengthy hollow product of almost uniform thickness over the whole length by welding the side ends of respective short synthetic resin sheets, molding a hollow material, welding its front end to the rear end of said hollow molded material and bonding integrally. CONSTITUTION:An upper mold 3a is lifted up by means of a short sheet and a press molding die 1, and first two heated sheets x1, x1 are fed between a press mold 31a and an inner mold 2 and also between a bottom force 3b and the inner mold 2 respectively. Then, the side ends of the upper and lower sheets x1, x1 are welded each other and a cylindrical hollow body is formed by lower ing the press mold 31a and a press mold 32a, pinching the upper side sheet x1 between the press mold 31a and the inner mold 2, also pinching the lower side sheet x1 between the bottom force 3b and the inner mold 2 and pressing. When the first press molding is over, the sheet is released to the front side, and the following heated upper and lower sheets x2, x2 are fed between the press mold 31a and the inner mold 2, and also between the inner mold 2 and the bottom force. After that, said procedures are repeated and a pipe-shaped lengthy hollow product is manufactured. |
