Patent ID: 8383526

Claim:
A sheet for use in a total heat exchanger comprising a hydrophilic polymer-processed sheet, said hydrophilic polymer-processed sheet comprising a porous sheet containing not less than 30% by weight and not more than 100% by weight of hydrophilic fiber and a fire retardant, and having pores thereof closed with regenerated cellulose, wherein said porous sheet is coated with an aqueous solution of cellulose which is a viscose, the pores of said porous sheet are closed with cellulose regenerated from said aqueous solution of cellulose on the surface and/or inside of said porous sheet, the cellulose regenerated from the aqueous solution of cellulose is present on the sheet in an amount of not less than 0.5 g/m 2 and not more than 30 g/m 2 , and the sheet has a moisture permeation of not less than 10000 g/m 2 per 24 hours, as measured according to a B-2 method of Moisture Permeability of Fiber materials under JIS L 1099, with air of 30° C. circulated with water temperature adjusted to 23° C.