| 摘要 |
<p>The extruded irrigation pipe (1) serves as a sleeve of a dripper unit have a cylindrical part (2) and being provided with a peripheral helicoidal groove (3). An inlet (4) made in the cylindrical part (2) leads from the interior of pipe (1) into groove (3) while an outlet (5) from the groove is provided in the pipe. The pipe is stretched over the cylinder (2). However, the internal diameter of pipe (1) and cylinder are equal, so that free flow of that part of the water which does not enter grooves (3) is permitted through part (2). The pipe may be produced in an extruder having a head of the type used to produce covered cables or sheathed wires.</p> |
