| 摘要 |
<p>The method involves placing lengths of covering material (1) consisting of lower sealing layer, drainage layer (3), and non-movable filter layer (5) over the tip. The layers overlap and suction elements (11) are placed in the gap between neighbouring layers. The elements feed liquids between the cover layers to the tip via capillary action. The suction elements consist of a non-woven fabric. The drainage layers are formed by numerous projections (4) on the top face of the sealing layers, which are manufactured in an injection moulding process and have a thickness of 0.5-4 mm. The drainage layers have a thickness of 5-25 mm.</p> |
