European Patent 1 216 145 was granted to W.L. Gore and Associates GmbH, K.P. Hochrein, and A. Bauer for a cover for the contained aerobic treatment of biodegradable matter, especially for box composting of organic wastes. The cover is a laminate of a porous polymeric layer adhered to a woven or knit or nonwoven fabric, in which the laminate has a specific air permeability and resistance to water vapour transmission.

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