| 摘要 |
PURPOSE:To continuously fabricate swollen-out portions in a hose by a method wherein a thin thermoplastic resin hose is locally heated up to its plasticating temperature and, after that, the heated part is pushed outwards with the tip of a former arranged in the hose abutted thereupon so as to be cooled and solidified as pushed. CONSTITUTION:A former 30 hangs down by pushing down the lower side wall 10a of a hose 10 with its own weight. A portion of the upper side wall 10b of the hose 10, which is exposed through the opening 33 of a keep plate 32, is locally heated up to the plastic temperature of the hose by being blasted with hot air from a nozzle 34. Next, when the former 30 is pushed up by raising a lifting rod 36, the tip of the former 30 abuts against the heated portion so as to protrude it outwards. During the protrusion of the tip of the former, the heated portion is stretched so as to swell outwards. By allowing to stand still as it is for a short time, the heated part cools down and solidifies so as to form a swollen-out portion. Thus, since the easy and rapid continuous forming of swollen-out portions becomes possible and can be automatized, the swollen-out portion can be manufactured at low cost without taking much time. |
