| 摘要 |
The invention relates to irrigation pipes and processes and devices for making them. Pipes for irrigating plants, especially their roots, with a substantially circular cross-section and apertures covered by a filter material applied to the outside of the pipe, in which the pipe (1) has longitudinal lips (10) whose opposite longitudinal sides form an intermediate space within which the apertures (3) lie and in which a filter strip (7, 11), for example of woven or mineral fibres or the like, is surrounded or held by the lips (10) or the apertures (3) are recessed in relation to the outer surface of the pipe (1) and are each covered by a piece (6) of filter material. |
