Patent ID: 6743339
Filing Date: 2004-06-01
Classification: D21F,Y10S

Abstract:
In a soft tissue paper machine having an essentially impermeable transfer belt for conducting a soft tissue web through a shoe press nip in the press section of the paper machine, and from the shoe press nip directly to a Yankee cylinder in the dryer section of the paper machine in a closed draw, which Yankee cylinder forms, together with a transfer means, a transfer nip transferring the soft tissue web from the transfer belt to the Yankee cylinder, the improvement comprising an essentially impermeable transfer belt having a carrier and an elastically compressible polymer layer on its side facing the paper web, the polymer layer having a hardness between 50 and 97 Shore A and having a web-contacting surface which has a pressure-sensitive resettable degree of roughness, the web-contacting surface having a degree of roughness in a non-compressed state of Rz=2-80*m, measured according to ISO 4287, Part I, and a lower degree of roughness of Rz=0-20*m when the polymer layer is compressed by a linear load of 20-220 kN/m applied to the essentially impermeable transfer belt as measured in a non-extended press nip,wherein the transfer of said soft tissue web from said shoe press nip directly to the Yankee cylinder is improved due to said transfer belt's web-contacting surface having a pressure-sensitive resettable degree of roughness.