A method for making tissue paper
The present invention relates to a method of making tissue paper in which a fibrous web (W) is formed in a forming section (2) and transferred to a Yankee drying cylinder (12) in a non-dewatering transfer nip (TN) formed between the Yankee drying cylinder (12) and a shoe roll (14). The Yankee drying...
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Zusammenfassung: | The present invention relates to a method of making tissue paper in which a fibrous web (W) is formed in a forming section (2) and transferred to a Yankee drying cylinder (12) in a non-dewatering transfer nip (TN) formed between the Yankee drying cylinder (12) and a shoe roll (14). The Yankee drying cylinder (12) has a cylindrical outer surface (13) and it is arranged to be rotatable about an axis of rotation (A). The shoe roll (14) has a shoe (15) that is deformable such that it can adapt to the cylindrical outer surface (13) of the Yankee drying cylinder (12) and the shoe roll (14) also comprises a rotatable flexible jacket (16) that is arranged to run in a loop around the shoe (15). A structured carrier fabric (10) runs in a loop around the shoe roll and has land areas and void areas facing the fibrous web. The method comprises forming the transfer nip (TN) between the shoe (15) and the cylindrical outer surface (13) of the Yankee drying cylinder (12) and the length (L) of the transfer nip (TN) in the circumferential direction of the Yankee drying cylinder (12) is in the range of 30 mm - 100 mm and the linear load in the transfer nip (TN) is in the range of 35 kN/m - 120 kN/m. According to the invention the peak pressure in the transfer nip (TN) as defined by the linear load divided by the land area of the carrier fabric (10) lies in the range 2 MPa - 8 MPa. |
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