E - Fixed Constructions – 02 – B
Patent
E - Fixed Constructions
02
B
182/121, 61/32
E02B 11/00 (2006.01)
Patent
CA 1111780
ABSTRACT The invention conce??s a laminated structure for use in prefabricated subsurface drains comprising a supporting sheet material and a filter sheet material. The filter sheet material has a permeability sufficient to allow the passage of water while retaining soil. The supporting sheet material has a structural configuration such that channels are formed between it and the filter sheet material to allow free flow of water within the plant of the laminated structure. The laminated structure may comprise the supporting sheet material with (a) the filter material on one side only, or (b) the filter material on both sides. or (c) the filter material on one side and an impermeable sheet material on the other side. The filter material preferably is a synthetic, thermoplastic filamentary, non woven fabric and the supporting material is preferably a thermoplastic plastics net-like material. The materials are preferably joined by a flame-bonding technique.
316376
Mckeand Eric
Nixon John A.
Gauvin Antoine H.
Imperial Chemical Industries Limited
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