Patent ID: 6368466
Filing Date: 2002-04-09
Classification: D21F

Abstract:
A press section of a paper making machine for dewatering a paper web formed in a preceding forming section of the paper making machine, comprising:a first felt for picking up the paper web having a confronting surface and an opposite surface from the forming section and carrying the paper web on a surface of said first felt, said first felt being comprised of a material that is at least one of water absorbing and water permeable; a first transfer means for transferring the paper web from the forming section to a lower surface of said first felt so that the confronting surface of the paper web adheres to said lower surface of said first felt; a second felt comprised of a material that is at least one of water absorbing and water permeable; a first extended nip suitable for applying pressure to a portion of a length of the paper web and across the width of the paper web, said first extended nip being downstream of said first transfer means and comprising a press roll in a lower position and a hose roll in an upper position, said press roll having a rigid, solid mantle with a hollow-face, and said hose roll having a flexible mantle and a press shoe within said flexible mantle proximate said press roll, said press shoe suitable for adjustably applying pressure to a portion of a length of the paper web; a first roll means for applying said second felt to the opposite surface of the paper web downstream of said first transfer means and for passing said first felt and said second felt with the paper web sandwiched therebetween through said first extended nip; a first separating means for separating said second felt from the paper web downstream of said first extended nip; a first roll nip downstream of said first extended nip and upstream of said first separating means for applying pressure across the width of the paper web; a center roll having a smooth surface and being situated at a higher elevation than said first extended nip; a second extended nip suitable for applying pressure to a portion of a length of the paper web and across the width of the paper web, said second extended nip being formed on said center roll downstream of said first extended nip and said first separating means, the paper web travelling from said first roll nip supported by said first felt to said second extended nip, the paper web adhering to said center roll at said second extended nip to separate the paper web from said first felt; a first pressure nip formed on said center roll downstream of said second extended nip for applying pressure across the width of the paper web; a third felt comprised of a material that is at least one of water absorbing and water permeable; and a second roll means for applying said third felt to the upper surface of the paper web downstream of said second extended nip, and for passing said third felt and the paper web through the first pressure nip, wherein said hose roll further comprises a second press shoe suitable for adjustably applying pressure to a portion of a length of the paper web and wherein said second extended nip is formed between said center roll and said second press shoe of said hose roll.