| 摘要 |
<p>This system comprises a single impermeable layer produced by the application of impermeable membranes (3, 4) comprising a self-adhesive lower face (5) over its entire surface, except for a heat-sealable edging (7) located on the border, on one side, and forming part of the overlapping edge of the said membranes (3, 4), the upper portion (5') of which is self-adhesive, and a self-protected upper face (6) over its entire surface, with the exception of a strip (8) located on the border, on the side opposite that which carries the heat-sealable edging (7) on the underside, the width of this strip (8) corresponding to that of the overlapping edge. <IMAGE></p> |
