US20090120603A1 - Seamed Felt for Papermaking - Google Patents

Seamed Felt for Papermaking Download PDF

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Publication number
US20090120603A1
US20090120603A1 US12/226,153 US22615307A US2009120603A1 US 20090120603 A1 US20090120603 A1 US 20090120603A1 US 22615307 A US22615307 A US 22615307A US 2009120603 A1 US2009120603 A1 US 2009120603A1
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US
United States
Prior art keywords
paper web
wet paper
core
fiber layer
sheath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/226,153
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English (en)
Inventor
Kazumasa Fujita
Yoshikazu Shiba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ichikawa Co Ltd
Original Assignee
Ichikawa Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ichikawa Co Ltd filed Critical Ichikawa Co Ltd
Assigned to ICHIKAWA CO., LTD. reassignment ICHIKAWA CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUJITA, KAZUMASA, SHIBA, YOSHIKAZU
Publication of US20090120603A1 publication Critical patent/US20090120603A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/10—Seams thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts

Definitions

  • the present invention relates to a seamed felt for papermaking (hereinafter referred to as a “seamed felt”).
  • a mainstream type of papermaking felts is the one in which a base part has a fabric structure made of monofilaments so as to improve water permeability.
  • Conventional on-machine-seamable seamed felts include a fabric for a papermaking machine in which a batt fiber layer and a strip made of flow-resistant material are provided above or adjacent to a seam part, so that the seam part of a seamed felt has substantially the same air and water permeability as in the other parts of the felt.
  • FIG. 2 shows a machine direction sectional view of a conventional seamed felt 10 ′.
  • the seamed felt 10 ′ has a base fabric 14 ′ woven with a monofilament, and is made into an endless form on-machine by joining of seam areas 12 ′.
  • the base fabric 14 ′ is a woven fabric comprising machine direction yarns 16 ′ and cross machine direction yarns 22 ′.
  • the machine direction yarns 16 ′ form seaming loops 18 ′.
  • the seaming loops 18 ′ provide a passage for a pintle 20 ′, and the base fabrics 14 ′ are joined by the combination of the seaming loops 18 ′ and the pintles 20 ′.
  • a strip 24 ′ is disposed in the seam area 12 ′, extending 0.5-2.0 inches (1.27-5.08 cm) long on its top side.
  • the strip 24 ′ is a ribbon made of either a woven fabric, an unwoven fabric, or a polymeric film, punched into the base fabric 14 ′ by needling.
  • a batt fiber layer 26 ′, made of staple fibers, is provided on at least one side of the base fabric 14 ′ by means of needle punching etc.
  • batt fiber layer 26 ′ is removed from the seaming loop 18 ′ on the bottom side of the base fabric 14 ′ to provide a gap 28 ′.
  • a slit 30 ′ is cut obliquely through the batt fiber layer 26 ′ and the strip 24 ′; however, the strip 24 ′ is supposed to contribute to provide a seamed felt 10 ′ wherein air and water permeability in the seam area 12 ′ can be maintained.
  • endless papermaking felts have often been used, which does not require on-machine seaming.
  • dewatering capability it is deemed important for both the endless felts and seamed felts to have a capability to rebound from a compressed state without flattening when depressurized, a capability to improve smoothness of the wet paper web with smoothness of the felt itself, and resistance to shedding and abrasion.
  • Unexamined Japanese Patent Publication No. 302584/1996 discloses a press felt with such capabilities which includes fibers with a core-in-sheath structure made from a two-component material.
  • the two-component material used for a fiber to form a batt layer is composed of a sheath member with a low melting point and a core member with a high melting point.
  • the sheath member with a low melting point gets softened to form a matrix within the batt layer, which supposedly enhances dewatering capability and compression resistance of the press felt.
  • the papermaking felt disclosed in Unexamined Japanese Patent Publication No. 302584/1996 tends to be vulnerable to repetitive compression by a press machine. More specifically, the above-mentioned papermaking felt with the batt layer made from the two-component material tends to require short-term replacement due to cutoffs of fibers during use, shedding or abrasion, because hot pressing in the manufacturing process of the felt causes deterioration of mechanical strength or chemical degradation of the core material.
  • the present invention resolved the above problems by a seamed felt for papermaking comprising a base layer having a seam part, a wet paper web side batt fiber layer formed on the wet paper web side surface of said base layer, and a press side batt fiber layer formed on the press side surface thereof;
  • said wet paper-web side batt fiber layer having a core-in-sheath fiber comprising a core member made of high-molecular-weight nylon with an absolute viscosity of 80 mPa ⁇ s or more and a sheath member made of nylon with a lower melting point than the core member, wherein a net-shaped fiber layer is formed with melted sheath members of said core-in-sheath fiber.
  • the content rate of said core-in-sheath fibers within said wet paper web side batt fiber layer is preferably in the range of 20-80%.
  • Said wet paper web side batt fiber layer can be multi-layered, in which the content rate of said core-in-sheath fibers increases incrementally from the press side toward the wet paper web side thereof. It is specifically preferable to provide a fiber layer without said core-in-sheath fibers on the wet paper web side surface of said base layer.
  • the present invention can effectively prevent shedding of batt fibers in the seam area, while achieving uniform properties throughout the seam areas and the non-seam areas. Therefore, this invention can provide a seamed felt which is capable of improving the quality of a wet paper web, less likely to tear a wet paper web, and demonstrates improved durability, in papermaking processes.
  • a net-shaped fiber layer is formed with melted sheath members of the core-in-sheath fiber, which makes the wet paper web side batt fiber layer dense. Resultantly, wet paper web side batt fiber layer works as a barrier to block water within the press side layer from moving to the wet paper web side, thereby preventing rewetting.
  • the invention successfully enhances resistance to shedding, abrasion, and compressions fatigue of the felt by providing the core member of the core-in-sheath fiber with high viscosity, i.e. by using high-molecular-weight nylon.
  • the felt is made more durable, reducing the need for replacement, contributes to improve the quality of the finished paper with less fibers attached thereon due to shedding and abrasion, and is capable of maintaining smoothness of the wet paper web contact surface.
  • FIG. 1 is a machine direction sectional view of an embodiment of a seamed felt of the present invention.
  • FIG. 2 is a machine direction sectional view of a conventional seamed felt.
  • a seamed felt of the present invention is to be detailed.
  • FIG. 1 illustrates a machine direction (MD) sectional view of a seamed felt 10 of this invention.
  • Machine direction refers to a longitudinal direction in which a papermaking machine drives a seamed felt
  • cross machine direction refers to a lateral direction which crosses the direction in which a papermaking machine drives a seamed felt.
  • the seamed felt 10 comprises a base layer 30 having a seam part, a wet paper web side batt fiber layer 20 formed on the wet paper web side surface of said base layer, and a press side batt fiber layer 21 formed on the press side surface thereof.
  • the wet paper web side batt fiber layer 20 formed on the wet paper web side surface of the base layer and a press side batt fiber layer 21 formed on the press side surface thereof are made of staple fibers, intertwiningly integrated with the wet paper web side and the press side of the base layer 30 respectively by needle punching.
  • the base layer 30 is produced by weaving a strip of an open-ended fabric on a loom with a warp (MD yarn) 31 and a weft (CMD yarn) 32 .
  • the seam part of the base layer 30 is to be described.
  • the warps 31 , 31 form so-called seaming loops 33 , 33 on the end of the base layer 30 , which are aligned in the cross machine direction.
  • Stick core wires (pintle wires) 36 are set into the seaming loops 33 , 33 to make the base layer 30 endless.
  • a seam part refers to a part where a seaming loop is formed on the end of the base layer 30 , into which a core wire is inserted to make the base layer endless.
  • a slot 11 is formed by obliquely cutting the wet paper web side batt fiber layer 20 above the core wire 36 down to the base layer 30 along the cross machine direction of the seamed felt 10 .
  • the wet paper web side batt fiber layer 20 is cut obliquely to form a slot 11 sloping in the machine direction, because a mark of a seam area 12 is less likely to be transferred onto a wet paper web compared to the wet paper web side batt fiber layer 20 cut vertically in the cross machine direction. Accordingly, a cut 11 ′ on the press side batt fiber layer can be vertical.
  • a triangular section is a flap f having the slot 11 as a hypotenuse against the base layer 30 .
  • the seamed felt 10 drives from the right to the left in FIG. 1 on a papermaking machine.
  • the wet paper web side batt fiber layer 20 includes a core-in-sheath fiber 41 , sheath members of said core-in-sheath fiber being melted by heat and/or hot pressing to form a net-shaped fiber layer, which makes the wet paper web side batt fiber layer dense, and hence durability of the seam area 12 is enhanced.
  • shedding and abrasion of the flap f in the seam area 12 and slots 11 , 11 ′, which are vulnerable to damage can be dramatically diminished.
  • a net-shaped fiber layer is formed with melted core-in-sheath fibers 41 of the seamed felt 10 , which makes the wet paper web side batt fiber layer 20 dense and improves surface smoothness of the seamed felt 10 .
  • wet paper web side batt fiber layer 20 As the wet paper web side batt fiber layer 20 is made dense, it works as a barrier to block shifting of water within the base layer and the press side batt fiber layer 21 formed on the press side thereof when the seamed felt 10 is released from nip pressure, thereby preventing rewetting effectively and improving the dewatering capability.
  • the wet paper web side batt fiber layer 20 comprises a core-in-sheath fiber 41 , a staple fiber, which has a core member made of high-molecular-weight nylon with an absolute viscosity of 80 mPa ⁇ s or more and a sheath member made of nylon with a lower melting point than the core member, whereas the press side batt fiber layer 21 formed on the press side surface of the base layer 30 is made of a staple fiber of a conventional nylon fiber 42 which does not include the core-in-sheath fiber 41 .
  • the core-in-sheath fiber 41 is enlarged for the purpose of illustration.
  • the present invention achieved balanced improvements of smoothness and resistance to shedding, abrasion, and compression fatigue by providing the core member with higher viscosity compared to conventional practices, i.e. by using high-molecular-weight nylon, and by disposing a layer made of such core-in-sheath fibers on the wet paper web side surface of the base layer of the seamed felt so that a net-shaped fiber layer is formed with melted core-in-sheath fibers.
  • Nylon used for the core member of the core-in-sheath fiber 41 should be high-molecular-weight nylon with an absolute viscosity of 80 mPa ⁇ s or more at 25 degrees C. and with a higher melting point than the sheath member.
  • nylon with a high viscosity 80 mPa ⁇ s or more
  • shedding, abrasion, and compression resistance of the felt can be enhanced.
  • high-molecular-weight nylon has a longer molecular chain, which improves mechanical strength (intensity or durability such as abrasion and attrition resistance) as a result of entanglement of such molecular chains.
  • Nylon with an absolute viscosity of less than 80 mPa ⁇ s (moderate viscosity) can not be sufficiently advantageous in enhancing shedding, abrasion, and compression resistance.
  • Preferable nylon used for the core member includes high-molecular-weight nylon 6, high-molecular-weight nylon 66, high-molecular-weight nylon 46, high-molecular-weight nylon 610, and high-molecular-weight nylon 612 and others.
  • nylon obtained by way of polycondensation of nylon salt is preferable, such as polymerization of ⁇ caprolactam (nylon 6), polycondensation of hexamethylenediamine adipate (nylon 66), polycondensation of 1,4-diaminobutane adipate (nylon 46), polycondensation of hexamethylenediamine sebacate (nylon 610), polycondensation of hexamethylenediamine dodecanedioic diacid (nylon 612), and aliphatic nylon can also be included which has a melting point of 200 degrees C. or more measured by DSC (Differential Scanning Calorimetry).
  • an absolute viscosity of the high-molecular-weight nylon above in 100 ml of 0.5 g/95% sulfuric acid is 80 mPa ⁇ s or more.
  • These high-molecular-weight nylon is produced with a well-known polymerization procedure or a solid phase polymerization procedure in which polymerized nylon flake is placed in an inert gas atmosphere of 120-200 degrees C. without oxygen (for example, Unexamined Japanese Patent Publication No. 529604/2002).
  • Nylon used for the sheath member of the core-in-sheath fiber 41 should have a lower melting point than the core member.
  • Preferred nylon includes binary copolymerized nylon such as nylon 6/12, nylon 6/610, nylon 66/6, nylon 66/12, and nylon 66/610, ternary copolymerized nylon such as nylon 6/66/12 and nylon Jun. 66, 19610.
  • a melting point of these copolymerized nylon fluctuates depending on their composition (or weight percentages of copolymerized elements), and only those with a melting point of 180 degrees C. or less is usable for this invention.
  • the wet paper web side batt fiber layer 20 is preferably made of a blend with a predetermined rate of the core-in-sheath fiber 41 and the normal nylon fiber 42 to achieve a better balance of smoothness, abrasion and compression fatigue resistance.
  • the blend consists of 80-20% of the core-in-sheath fiber 41 and 20-80% of the nylon fiber 42 .
  • the wet paper web side batt fiber layer 20 is made less dense. Therefore, the felt lacks resistance to shedding, abrasion and compression fatigue, and smoothness, and is incapable of preventing rewetting effectively.
  • the felt tends to be flattened with the wet paper web side batt fiber layer 20 susceptible to compression fatigue, while it has smoothness, abrasion resistance and is effective in prevention of rewetting.
  • the wet paper web side batt fiber layer 20 can be multi-layered, in which the content rate of the core-in-sheath fiber 41 increases incrementally from the press side toward the wet paper web side thereof to provide more improvements in smoothness and resistance to shedding and abrasion.
  • a batt fiber layer without the core-in-sheath fiber 41 on the wet paper web side surface of the base layer is especially preferred. More specifically, when the seam part of the base layer 30 is intertwiningly integrated with the wet paper web side batt fiber layer 20 by needle punching, melted and netted fibers obstruct the seaming loops 33 , 33 , blocking insertion of the core wire (pintle wire) 36 .
  • a batt fiber layer without the core-in-sheath fiber 41 preferably a batt fiber layer with a basis weight of 50 g/m 2 or more, is provided on the wet paper web side surface of the base layer, the seam part is prevented from being intertwined with the core-in-sheath fiber 41 .
  • the ratio of the volume of the core and the sheath members of the core-in-sheath fiber 41 should not be limited, it can range from 5:1 to 1:5, with a preferable rate of 1:1.
  • the nylon fiber 42 used for the wet paper web side batt fiber layer 20 , the press side batt fiber layer 21 , and for the blend with the core-in-sheath fiber 41 is preferably nylon 6, nylon 66, nylon 46, nylon 610, and nylon 612 etc.
  • Preferable fineness of the core-in-sheath fiber 41 is 15-25 dtex for a picking-up seamed felt used in a first stage in a press section of a papermaking machine, 10-20 dtex for a seamed felt for a second and third press used in a middle stage of the press section, and 5-20 dtex for a seamed felt for a fourth press and a shoe press used in the last stage of the press section.
  • Preferred fineness of the nylon fiber 42 is 10-25 dtex for the wet paper web side batt fiber layer 20 and 15-25 dtex for the press side batt fiber layer 21 respectively of a picking-up seamed felt used in a first stage of a press section of a papermaking machine.
  • preferred fineness is 10-15 dtex for the wet paper web side batt fiber layer 20 and 10-20 dtex for the press side batt fiber layer 21 respectively.
  • preferred fineness is 5-15 dtex for the wet paper web side batt fiber layer 20 and 5-20 dtex for the press side batt fiber layer 21 respectively.
  • the present invention can effectively prevent shedding of batt fibers in the seam area, while achieving uniform properties throughout the seam areas and the non-seam areas. Therefore, this invention can provide a seamed felt which is capable of improving the quality of a wet paper web, less likely to tear a wet paper web, and demonstrates improved durability, in papermaking processes.
  • wet paper web side batt fiber layer works as a barrier to block water within the press side layer from moving to the wet paper web side, thereby preventing rewetting.
  • the invention successfully enhances resistance to shedding, abrasion, and compression fatigue of the felt by providing the core member of the core-in-sheath fiber with high viscosity, i.e. by using high-molecular-weight nylon.
  • the felt is made more durable, reducing the need for replacement, contributes to improve the quality of the finished paper with less fibers attached thereon due to shedding and abrasion, and is capable of maintaining smoothness of the wet paper web contact surface.

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US12/226,153 2006-04-11 2007-04-11 Seamed Felt for Papermaking Abandoned US20090120603A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006131921 2006-04-11
JP2006131921A JP4976740B2 (ja) 2006-04-11 2006-04-11 抄紙用シームフェルト
PCT/JP2007/058378 WO2007119856A1 (fr) 2006-04-11 2007-04-11 Feutre a couture pour fabrication de papier

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US20090120603A1 true US20090120603A1 (en) 2009-05-14

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US12/226,153 Abandoned US20090120603A1 (en) 2006-04-11 2007-04-11 Seamed Felt for Papermaking

Country Status (8)

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US (1) US20090120603A1 (fr)
EP (1) EP2006444A4 (fr)
JP (1) JP4976740B2 (fr)
KR (1) KR20080113213A (fr)
CN (1) CN101421458A (fr)
CA (1) CA2649264A1 (fr)
TW (1) TW200738934A (fr)
WO (1) WO2007119856A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100252218A1 (en) * 2007-11-20 2010-10-07 Ichikawa Co., Ltd. Felt for papermaking
CN118434935A (zh) * 2021-11-04 2024-08-02 福伊特专利有限公司 罩套和方法
US12490810B2 (en) 2017-02-03 2025-12-09 Nike, Inc. Fiber-bound engineered materials formed using zonal scrims

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5571403B2 (ja) * 2010-02-09 2014-08-13 日本フエルト株式会社 製紙用フェルトおよびその製造方法
WO2018144120A1 (fr) * 2017-02-03 2018-08-09 Nike Innovate C.V. Matériaux modifiés liés à des fibres formés à l'aide de canevas de fondation
EP4371762B1 (fr) * 2017-02-03 2025-09-10 Nike Innovate C.V. Matériaux modifiés liés à des fibres formés à l'aide de canevas d'élément
US20190366680A1 (en) 2017-02-03 2019-12-05 Nike, Inc. Fiber-bound engineered materials formed using continuous scrims
WO2018144124A1 (fr) 2017-02-03 2018-08-09 Nike Innovate C.V. Matériaux modifiés liés à des fibres formés à l'aide de canevas modifiés
US20200060377A1 (en) * 2017-02-03 2020-02-27 Nike, Inc. Fiber-Bound Engineered Materials Formed Using Partial Scrims
WO2018144118A1 (fr) 2017-02-03 2018-08-09 Nike Innovate C.V. Matériaux façonnés liés par des fibres, formés sous la forme d'un cuir synthétique
CN110996706B (zh) 2017-08-16 2022-07-29 耐克创新有限合伙公司 具有缠结的折叠边缘的用于鞋类的非编织纺织品
DE102019134837A1 (de) * 2019-12-18 2021-06-24 Voith Patent Gmbh Bespannung
JP7314066B2 (ja) * 2020-01-23 2023-07-25 日本フエルト株式会社 接合用芯線、接合用具、リードワイヤー、製紙用シームフェルト及びその接合方法
JP7843653B2 (ja) * 2022-06-16 2026-04-10 日本フエルト株式会社 製紙用シームフェルト

Citations (4)

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US5549967A (en) * 1995-05-04 1996-08-27 Huyck Licensco, Inc. Papermakers' press fabric with increased contact area
US5888915A (en) * 1996-09-17 1999-03-30 Albany International Corp. Paper machine clothings constructed of interconnected bicomponent fibers
US6712100B2 (en) * 2000-10-23 2004-03-30 Albany International Corp. Seamed papermaker's fabrics
US7674732B2 (en) * 2004-06-25 2010-03-09 Ichikawa Co., Ltd. Felt for papermaking

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JPH03104995A (ja) * 1989-09-19 1991-05-01 Daiwabo Co Ltd 抄紙用ニードルフェルト
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JP3440442B2 (ja) * 1998-01-06 2003-08-25 市川毛織株式会社 抄紙用フェルト及びその製造方法
US6235390B1 (en) 1998-11-03 2001-05-22 E. I. Du Pont De Nemours And Company High RV filaments, and apparatus and processes for making high RV flake and the filaments
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Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US5549967A (en) * 1995-05-04 1996-08-27 Huyck Licensco, Inc. Papermakers' press fabric with increased contact area
US5888915A (en) * 1996-09-17 1999-03-30 Albany International Corp. Paper machine clothings constructed of interconnected bicomponent fibers
US6712100B2 (en) * 2000-10-23 2004-03-30 Albany International Corp. Seamed papermaker's fabrics
US7674732B2 (en) * 2004-06-25 2010-03-09 Ichikawa Co., Ltd. Felt for papermaking

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100252218A1 (en) * 2007-11-20 2010-10-07 Ichikawa Co., Ltd. Felt for papermaking
US8262862B2 (en) 2007-11-20 2012-09-11 Ichikawa Co., Ltd. Felt for papermaking
US12490810B2 (en) 2017-02-03 2025-12-09 Nike, Inc. Fiber-bound engineered materials formed using zonal scrims
CN118434935A (zh) * 2021-11-04 2024-08-02 福伊特专利有限公司 罩套和方法

Also Published As

Publication number Publication date
TW200738934A (en) 2007-10-16
WO2007119856A1 (fr) 2007-10-25
JP4976740B2 (ja) 2012-07-18
EP2006444A2 (fr) 2008-12-24
JP2007277784A (ja) 2007-10-25
KR20080113213A (ko) 2008-12-29
CA2649264A1 (fr) 2007-10-25
CN101421458A (zh) 2009-04-29
EP2006444A4 (fr) 2009-03-25

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Owner name: ICHIKAWA CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FUJITA, KAZUMASA;SHIBA, YOSHIKAZU;REEL/FRAME:021730/0284

Effective date: 20081003

STCB Information on status: application discontinuation

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