| 摘要 |
<p>The method involves extruding a pipe body (2) in which dosing elements is inserted. The dosing elements are connected with an inner side of the body. Outlet openings are introduced in the body in an area of the dosing elements with a laser drill device (8) with radiation intensities. Water in the pipe body is discharged into the openings in drops. The radiation intensities of the laser drill device are reduced during drilling processes. A laser beam is guided over a laser optics cooperating with the laser drill device. The laser beam is fired on a surface alphanumeric character.</p> |
