# US 8,540,849 B2 · Press felt for papermaking > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,849 B2 - Document ID: US8540849B2 - Status: Granted - Kind: B2 - Application number: 13/314,251 - Filed: 2011-12-08 - Published: 2012-06-14 - Granted: 2013-09-24 - Earliest claimed: 2010-12-08 - Assignees: Ichikawa Co., Ltd. - Applicants: Yasuyuki Ogiwara - Inventors: Yasuyuki Ogiwara - Web page: https://patentgrep.com/patent/US8540849B2 ## CPC - D21F 7/083: {Multi-layer felts} - D21F 7/10: Seams thereof - Y10T 442/3724: Needled - D21F: PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Press felts for papermaking include a batt fiber layer and a base fabric. The batt fiber layer is integrated into the base fabric. The base fabric includes a ground warp yarn, a ground weft yarn, and an additional warp yarn. The ground warp yarn and the ground weft yarn include monofilament yarns, and the additional warp yarn includes a material different from a material forming the ground warp yarn. The additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the additional warp yarn ascends toward a wet paper web-side surface of the base fabric and descends toward a roll-side surface of the base fabric, relative to the at least one ground warp yarn. ## Claims ### Claim 1 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground weft yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; the at least one additional warp yarn comprises a yarn assembly material obtained by assembling a plurality of at least one of staple yarns and filament yarns; the at least one ground warp yarn is folded back at an end of the base fabric in the warp yarn direction to form an end connection loop; and the at least one additional warp yarn is provided entirely on a wet paper web-side of the end connection loop in a vicinity of the end connection loop. ### Claim 2 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground weft yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; the at least one additional warp yarn comprises a yarn assembly material obtained by assembling a plurality of at least one of staple yarns and filament yarns; the at least one ground warp yarn is folded back at an end of the base fabric in the warp yarn direction to form an end connection loop; and the at least one additional warp yarn is provided entirely on a roll-side of the end connection loop in a vicinity of the end connection loop. ### Claim 3 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground weft yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; the at least one ground warp yarn is folded back at an end of the base fabric in the warp yarn direction to form an end connection loop; and the at least one additional warp yarn is provided entirely on a wet paper web-side of the end connection loop in a vicinity of the end connection loop. ### Claim 4 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground weft yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; the at least one ground warp yarn is folded back at an end of the base fabric in the warp yarn direction to form an end connection loop; and the at least one additional warp yarn is provided entirely on a roll-side of the end connection loop in a vicinity of the end connection loop. ### Claim 5 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground well yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; the at least one additional warp yarn comprises a yarn assembly material obtained by assembling a plurality of at least one of staple yarns and filament yarns; and at least one additional warp yarn is folded back at an end of the base fabric in the warp yarn direction to form an end connection loop. ### Claim 6 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground weft yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; and at least one additional warp yarn is folded back at an end of the base fabric in the warp yarn direction to form an end connection loop. ### Claim 7 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground weft yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; the at least one ground warp yarn has a thickness of from 500 to 3,000 dtex; the at least one ground weft yarn has a thickness of from 500 to 2,700 dtex; and the at least one additional warp yarn comprises a monofilament yarn having a thickness of from 200 to 800 dtex. ### Claim 8 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground weft yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; the at least one ground warp yarn has a thickness of from 500 to 3,000 dtex; the at least one ground weft yarn has a thickness of from 500 to 2,700 dtex; and the at least one additional warp yarn comprises a twisted yarn comprising monofilament yarns having a thickness of from 100 to 500 dtex. ### Claim 9 A press felt for papermaking, comprising: at least one batt fiber layer; and a base fabric; wherein: the at least one batt fiber layer is integrated into the base fabric; the base fabric comprises a wet paper web-side surface and a roll-side surface; the base fabric comprises at least one ground warp yarn, at least one ground weft yarn, and at least one additional warp yarn; the at least one ground warp yarn and the at least one ground weft yarn comprise monofilament yarns; the at least one additional warp yarn comprises a material different from a material forming the at least one ground warp yarn; the at least one additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the at least one additional warp yarn ascends toward the wet paper web-side surface and descends toward the roll-side surface, relative to the at least one ground warp yarn; the at least one ground warp yarn is folded back at an end of the base fabric in the warp yarn direction to form an end connection loop; and the at least one additional warp yarn is folded back at an end of the base fabric in the warp yarn direction to form an end connection loop.