| 摘要 |
1. Impervious barrier, consisting of several sealing sheets, laid overlapping one another and sealed (welded) together at the overlapping edge strips, especially bituminous sealing sheets containing ethylene copolymer, comprising a mixture of polyethylene/acrylic acid ester copolymer, bitumen, high-pressure polyethylene and anthracite dust and with a multiple weld seam, characterized in that either a double weld seam is provided, in which the width of the rear weld seam is 1.2 to 2 times the width of the front weld seam, or a triple weld seam is provided, in which the weld seams are at equal distances from one another and have the same width. |
