| 摘要 |
<p>PURPOSE:To obtain a synthetic resin pipe excellent in pressure-resistant flat capacity and having almost smooth inner and outer surface in an extremely easy manner. CONSTITUTION:A synthetic resin pipe consists of almost cylindrical inner and outer walls 2, 3 constituting a pipe wall 1 and the connection walls 4 connecting both inner and outer walls 2, 3. The strip like material forming the pipe wall is formed into a hollow member having a triangular cross section and the bottom wall 11 of the hollow member consists of the strip like material 10A forming the inner wall 2 and the strip like material 10B forming the outer wall 3 and both strip materials 10A, 10B are alternately spirally wound to mutually connect adjacent inclined walls 12, 13 and the connection wall 4 consists of inclined connection walls 4a, 4b mutually different in inclination direction.</p> |
