Patent ID: 6070340
Filing Date: 2000-06-06
Classification: D21F

Abstract:
In a group with single-wire draw in a dryer section of a paper machine, including heated drying cylinders each having a smooth face against which a paper web to be dried is brought into direct contact, reversing cylinders each arranged in a respective gap between an adjacent pair of said drying cylinders, a drying wire for supporting the web and guide rolls for guiding said drying wire in a loop such that said drying cylinders are situated outside said wire loop and said reversing cylinders are situated inside said wire loop, the improvement comprising:said drying cylinders comprising at least one small cylinder and large cylinders each having a diameter larger than a diameter of said at least one small cylinder,each of said at least one small cylinder being situated in a gap between a respective, adjacent pair of said large cylinders,at least two of said large cylinders being arranged adjacent one another without the interposition of one of said at least one small cylinder,said at least one small cylinder being arranged such that a center of rotation of said at least one small cylinder is situated at a first level different than a second level at which centers of rotation of said large cylinders are situated,said reversing cylinders being arranged relative to said drying cylinders to provide runs for said drying wire and the web supported thereon between said at least one small cylinder and each of said respective, adjacent pair of said large cylinders,each of said reversing cylinders having a center of rotation situated at at least one additional level different than said first and second levels,said reversing cylinders, said small cylinders and said large cylinders being arranged such that said first level is between said second level and each of said at least one additional level.