Process for changing the water content of water- absorbing...

Details Process for changing the water content of water- absorbing... Process for changing the water content of water- absorbing...

D - Textiles, Paper

06

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183/1

D06N 3/04 (2006.01) A23L 3/3418 (2006.01) A61L 15/24 (2006.01) B32B 7/02 (2006.01) B32B 27/12 (2006.01) B65D 65/38 (2006.01) D06M 15/333 (2006.01) F24F 6/00 (2006.01) F26B 5/00 (2006.01)

Patent

CA 1168594

HOE 80/F 238 - 1 - ABSTRACT OF THE DISCLOSURE The water content of a material, which tends to either absorb water or to release water, is changed with the aid of a film, which at least partially sepa- rates the material from the adjacent space and is imper- meable to liquid water but permeable to gaseous water. Polyvinyl alcohol with a particular degree of polymeri- sation and degree of hydrolysis is used as the film ma- terial. The film can be mechanically or chemically after-treated. The moistening or de-moistening of the material, which is solid, liquid or gaseous, is effected, utilising a water vapor pressure gradient, under very mild conditions.

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