# US 2019/0316296 A1 · A method for making tissue paper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0316296 A1 - Document ID: US20190316296A1 - Status: Published application - Kind: A1 - Application number: 16/471,316 - Filed: 2017-12-12 - Published: 2019-10-17 - Earliest claimed: 2016-12-19 - Assignees: Valmet Aktiebolag - Applicants: Valmet Aktiebolag - Inventors: Karl-Johan TOLFSSON; Jan PAULSSON; Goeran EKSTROEM; Joakim ARONSSON - Web page: https://patentgrep.com/patent/US20190316296A1 ## CPC - D21F 11/006: {Making patterned paper} - D21F 3/0218: {Shoe presses} - D21F 3/0281: {in combination with a dryer roll} - D21F 3/045: {including at least one extended press nip} - D21F: PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON ## Abstract 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. ## Claims ### Claim at position 1 1-8. (canceled) ### Claim 9 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) having a cylindrical outer surface (13) and being arranged to be rotatable about an axis of rotation (A), the shoe roll (14) comprising a shoe (15) that is arranged to act against the Yankee drying cylinder (12), and the shoe roll (14) further comprising a rotatable flexible jacket (16) that is arranged to run in a loop around the shoe (15), in which method a carrier fabric (10) runs in a loop around the shoe roll (14) and follows the fibrous web (W) into the transfer nip (TN), the carrier fabric (10) having a structured surface facing the fibrous web (W) such that a three-dimensional pattern can be imprinted into the fibrous web (W) by the carrier fabric (10) and the structured surface of the carrier fabric (10) having land areas (29) and open areas (30), and wherein 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 wherein 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 wherein the method comprises application of a chemical coating on the cylindrical outer surface (13) of the Yankee drying cylinder (12) and creping the fibrous web (W) from the cylindrical outer surface (13) of the Yankee drying cylinder (12), wherein the land areas (29) of the structured surface of the carrier fabric (10) constitute 15%-90% of the total surface area of that side of the carrier fabric (10) that faces the fibrous web (W) and wherein the linear load in the transfer nip is selected such that the peak pressure in the transfer nip (TN) is in the range of 2 MPa-8 MPa when the pressure in the transfer nip (TN) is defined as the force of the linear load in the transfer nip (TN) divided by the sum of the land areas (29) of that part of the carrier fabric (10) that is in the transfer nip (TN) in a given moment. ### Claim 10 (depends on 9) A method according to claim 9, wherein the peak pressure in the transfer nip (TN) does not exceed the average pressure in the transfer nip (TN) by more than 75%. ### Claim 11 (depends on 9) A method according to claim 9, wherein the peak pressure in the transfer nip (TN) does not exceed the average pressure in the transfer nip (TN) by more than 60%. ### Claim 12 (depends on 9) A method according to claim 9, wherein the peak pressure in the transfer nip (TN) does not exceed the average pressure in the transfer nip (TN) by more than 50%. ### Claim 13 (depends on 9) A method according to claim 9, wherein the fibrous web (W) is first dried on at least one through-air drying cylinder (8, 9) and subsequently transferred to the Yankee drying cylinder (12) and wherein the linear load in the transfer nip (TN) is in the range of 35 kN/m-45 kN/m. ### Claim 14 (depends on 9) A method according to claim 9, wherein the Yankee drying cylinder (12) is the first drying cylinder on which the fibrous web (W) is dried and wherein the linear load in the transfer nip (TN) is in the range of 65 kN/m-95 kN/m. ### Claim 15 (depends on 9) A method according to claim 9, wherein the Yankee drying cylinder (12) is the first drying cylinder on which the fibrous web (W) is dried and wherein the linear load in the transfer nip (TN) is in the range of 70 kN/m-90 kN/m. ### Claim 16 (depends on 9) A method according to claim 9, wherein the pressure in the transfer nip (TN) is so distributed that the pressure follows a pressure curve from an entry point (21) of the transfer nip to an exit point (22) of the transfer nip and wherein the pressure curve has a saddle point (23) located between two points (24, 25) where the pressure is higher than in the saddle point (23). ### Claim 17 (depends on 9) A method according to claim 9, wherein the tissue paper has a basis weight in the range of 12 g/m2-30 g/m2 when it leaves the Yankee drying cylinder (12). ### Claim 18 (depends on 9) A method according to claim 9, wherein the shoe (15) of the shoe roll (14) is a deformable shoe (15) that can adapt to the shape of the cylindrical outer surface (13) of the Yankee drying cylinder (12).