# US 2025/0084591 A1 · Toilet paper roll manufacturing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0084591 A1 - Document ID: US20250084591A1 - Status: Published application - Kind: A1 - Application number: 18/288,226 - Filed: 2022-12-19 - Published: 2025-03-13 - Earliest claimed: 2022-04-28 - Assignees: Corelex Shin-Ei Co., Ltd. - Applicants: Corelex Shin-Ei Co., Ltd. - Inventors: Satoshi KUROSAKI - Web page: https://patentgrep.com/patent/US20250084591A1 ## CPC - D21H 27/002: {Tissue paper; Absorbent paper (D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00)} - B31F 5/04: by exclusive use of adhesives - B32B 37/1284: {Application of adhesive} - D21H 27/30: Multi-ply (for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00) - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR - B31F: MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making layered products not composed wholly of paper or cardboard B32B) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM ## Abstract A toilet paper roll manufacturing method is provided with which, when 4-ply toilet paper is torn off, individual layered sheets of the paper are prevented from peeling off each other and a good appearance is ensured. The method includes a step of forming laminated paper 101 by bonding base paper 10a and base paper 11a, a step of forming laminated paper 102 by bonding base paper 13a and base paper 12a, and a step of spraying a bonding liquid to the laminated paper 101 and the laminated paper 102, stacking and pressing the laminated paper 101 and the laminated paper 102 by pressure rollers 23c, and forming 4-ply toilet paper 200. ## Claims ### Claim 1 A toilet paper roll manufacturing method comprising: a first step of pulling out base paper from each of multiple base paper rolls; a second step of introducing multiple sheets of the base paper to a lamination unit, laminating the multiple sheets of the base paper, and forming 4-ply toilet paper; a third step of drying the 4-ply toilet paper; and a fourth step of rolling up the 4-ply toilet paper and manufacturing a 4-ply toilet paper roll, wherein the second step comprises: a fifth step of separating the multiple sheets of the base paper introduced to the lamination unit into multiple sheets of 1-ply base paper; a sixth step of operating a first sprayer to spray a bonding liquid between first base paper and second base paper among the multiple sheets of 1-ply base paper and forming first laminated paper made up of the first base paper and the second base paper; a seventh step of operating a second sprayer to spray the bonding liquid between third base paper and fourth base paper among the multiple sheets of 1-ply base paper and forming second laminated paper made up of the third base paper and the fourth base paper; and an eighth step of operating a third sprayer to spray the bonding liquid between the first laminated paper and the second laminated paper, and operating a first pressure roller to stack and press the first laminated paper and the second laminated paper and to form the 4-ply toilet paper, the sixth step and the seventh step being performed simultaneously. ### Claim 2 (depends on 1) The toilet paper roll manufacturing method according to claim 1, wherein the sixth step comprises applying the bonding liquid to adhere to the first base paper and the second base paper, and stacking and pressing the first base paper and the second base paper by a second pressure roller, and the seventh step comprises applying the bonding liquid to adhere to the third base paper and the fourth base paper, and stacking and pressing the third base paper and the fourth base paper by a third pressure roller. ### Claim 3 (depends on 1) The toilet paper roll manufacturing method according to claim 1, wherein the eighth step comprises: operating the second sprayer to spray the bonding liquid in an amount enough for causing fiber-to-fiber gaps in the first laminated paper and fiber-to-fiber gaps in the second laminated paper to widen due to permeation of the bonding liquid; and operating the first pressure roller to apply pressure such that water of the bonding liquid is discharged from the fiber-to-fiber gaps in the first laminated paper and the fiber-to-fiber gaps in the second laminated paper. ### Claim 4 (depends on 2) The toilet paper roll manufacturing method according to claim 2, wherein the eighth step comprises: operating the second sprayer to spray the bonding liquid in an amount enough for causing fiber-to-fiber gaps in the first laminated paper and fiber-to-fiber gaps in the second laminated paper to widen due to permeation of the bonding liquid; and operating the first pressure roller to apply pressure such that water of the bonding liquid is discharged from the fiber-to-fiber gaps in the first laminated paper and the fiber-to-fiber gaps in the second laminated paper.