| 摘要 |
The pipe may be made from a flat sheet of high density plastics having sufficient strength to withstand the water pressure. The sheet is formed into a tube with the longitudinal edges overlapping. Each longitudinal edge is secured to the tube by an adhesive band (2, 3) which is of sufficient thickness to form a passage (4) along the length of the pipe. Spaced orifices (5) in the inner wall of passage (4) alternate with similar orifices in the outer wall to regulate the flow of water from within the pipe. |
