| 摘要 |
<p>A method and apparatus for making a dripper line by feeding the dripper units (DU) into the extruded tube (ET) at a linear velocity, at the instant of their initial contact with the inner surface of the tube, which is greater than the linear velocity of the inner surface of the tube where initially contacted by the dripper units. The dripper units are fed between a track (10) within the extruded tube and a moving backing surface (20) externally of the tube spaced from the track to determine the final thickness of the extruded tube and the dripper unit welded thereto.</p> |
