Patent ID: 7323087

Claim:
A press unit for dewatering a fiber web, said press unit comprising: first and second opposing press elements, said first press element and said second press element together forming a nip therebetween wherein said first press element is an enclosure containing pressurized fluid and said second press element is a counter element positioned opposite said enclosure; at least one anti-rewet fabric configured for carrying the fiber web through said nip, each said anti-rewet fabric having a first fabric side and a second fabric side, each said anti-rewet fabric including: at least one air distribution fabric layer, one air distribution fabric layer being configured for contacting the fiber web; and at least one of a perforated film layer and a spectra membrane, said at least one of a perforated film layer and a spectra membrane being comprised of one of a polymeric film, a polyester film and a plastic film, said at least one of a perforated film layer and a spectra membrane having a first film side and a second film side, said first film side being one of laminated and attached to said one air distribution fabric layer, said second film side being directed toward said counter element; said press unit further comprising a second fabric having a permeability being one of equal and less than a permeability of said at least one anti-rewet fabric; and said at least one anti-rewet fabric being arranged between the fiber web and said counter element and said second fabric being arranged between the fiber web and said enclosure.