| 摘要 |
A draining mat having high compressive strength and consisting of two non woven fabrics with granules arranged stationarily therebetween. The granules are arranged in a single layer and are spaced from one another at a distance equal to at least 50% of the average grain size. One of the two fabrics is basically a filter bed, while the second fabric may be a filter bed or a dense web. A three dimensional mat, with positioning locations for the granules may also be arranged between the two fabrics. This draining mat is suitable for the production of dump bottoms. |
