| 摘要 |
The invention provides sealing sheeting of swellable clay impervious to water and/or oil which essentially consist of a porous material, in whose pores swellable clay is lodged and which on either side are provided with covering layers, of which at least one consists of a water-soluble coating. Such sealing sheeting has water permeability coefficients in its overlap joins which are of the same order as in the sealing sheeting itself. Furthermore in situ needle punching of the overlapped join is possible in order to produce a strong composite structure providing that one overlapped join is produced by sealing sheeting, which has a non-woven material as a porous substrate material.
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