EP2042653A1 - Feutre servant à fabriquer du papier - Google Patents

Feutre servant à fabriquer du papier Download PDF

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Publication number
EP2042653A1
EP2042653A1 EP07768211A EP07768211A EP2042653A1 EP 2042653 A1 EP2042653 A1 EP 2042653A1 EP 07768211 A EP07768211 A EP 07768211A EP 07768211 A EP07768211 A EP 07768211A EP 2042653 A1 EP2042653 A1 EP 2042653A1
Authority
EP
European Patent Office
Prior art keywords
yarns
base
felt
core
sheath composite
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.)
Withdrawn
Application number
EP07768211A
Other languages
German (de)
English (en)
Inventor
Yoshiaki Ito
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
Publication of EP2042653A1 publication Critical patent/EP2042653A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • D21F7/083—Multi-layer felts

Definitions

  • the pressing zone of a papermaking process employs a felt for squeezing water out of a wet paper web.
  • a papermaking machine for removing water from the wet paper web has three zones, i.e., a forming zone, a pressing zone and a drying zone, for removing water from the wet paper web during the papermaking process. In each of the zones, water is continuously removed from the wet paper web.
  • Each of the zones employs a papermaking tool having a dehydrating capability.
  • Fig. 5 is a schematic view of a press apparatus.
  • the press apparatus comprises a pair of pressing rolls Pa, Pa and a pair of felts 11a, 11a for sandwiching a wet paper web Wa therebetween.
  • the pressing rolls Pa, Pa which make up a pressurizing mechanism, pressurized felts 11a, 11a and the wet paper web Wa, water is squeezed out of the wet paper web Wa and is absorbed by the felts 11a, 11a.
  • the water absorbed by the felts 11a, 11a is drawn and discharged by respective suction boxes FSB.
  • the water which has not been absorbed by the felts is discharged as splashes SP in a direction tangential to the lower pressing roll Pa at the outlet of the press.
  • Each of the felts has a plurality of basic functions which need to be performed. These functions include a water squeezing function to squeeze water out of the wet paper web, a smoothing function to increase the smoothness of the wet paper web, and a wet paper web feeding function to feed the wet paper web.
  • the felt has to have all these functions in balance.
  • the function to squeeze water out of the wet paper web is performed as follows: While the wet paper web and the felts are traveling through between the pressing rolls, the wet paper web and the felts are compressed in the thicknesswise direction under pressure. The water squeezed out of the wet paper web is transferred to the felts.
  • the water transferred to the felts is discharged from the reverse sides of the felt under pressure, or is drawn by the suction boxes of the papermaking machine and is discharged out of the felt system. Therefore, it is important for the felts to have water permeability and also a function to be recovered from the compressed state when the felts are depressurized (an ability to be compressed and recovered and an ability to sustain such an ability to be compressed and recovered).
  • the felts As the felts pass across the suction boxes, the felts are worn by friction and some of their fibers tend to pull out. Consequently, it is critical for the felts to sustain the above functions, including a function to resist fiber removal, from an initial phase of their use.
  • Fig. 1 is a cross-sectional view of a general felt for papermaking according to the background art. The structure of the general felt will be described below with reference to Fig. 1 .
  • a felt 10 for papermaking is of an endless structure comprising a base 20, in the form of a woven fabric or the like, and a batt fiber layer 30 integrally intertwined with the base 20 by needle punching.
  • the felt in the pressing zone tends to be flattened under high pressure, lowering its water permeability and its ability to be compressed and recovered.
  • Basic performance requirements for felts include a sustained water squeezing ability, a sustained smoothing ability and a sustained fiber removal resisting ability. Particularly, latest high-speed papermaking machines are required to have a high sustainability level for the water squeezing ability, the smoothing ability and the fiber removal resisting ability.
  • Japanese laid-open patent publication No. 08-302584 reveals a felt including a batt layer made of a bicomponent material.
  • the felt is heated to soften a material of low melting point included in the bicomponent material, causing it to enter the cross section of the batt fibers and the base. Thereafter, the bicomponent material is hardened to form a matrix, which reinforces the base to exhibit compression resistance.
  • the present invention has been made in view of the above problems. It is an object of the present invention to provide a felt for papermaking which has a good water squeezing ability, an excellent wet paper web smoothly ability, an excellent fiber removal resisting ability, an excellent durability, and which particularly has an excellent fiber removal resisting ability suitable for use in a high-speed papermaking machine.
  • a felt according to the present invention comprises two or more stacked bases (a first base and a second base). At least one of the bases is formed of soft-twisted warp yarns or weft yarns including core-in-sheath composite fibers.
  • the yarns tend to become flat easily. Interstices between the yarns are closed by a melted low-melting-point component of batt fibers including core-in-sheath composite fibers and a melted low-melting-point component of the yarns. It has been found that the felt thus constructed can achieve the above object.
  • interstices between the yarns signify interstices between the rows of warp yarns or weft yarns (interstices between the yarn and yarn) and interstices in the yarns (interstices between strands of the twisted yarns).
  • batt fibers including core-in-sheath composite fibers are stacked on one or both surfaces of two or more bases of one type or different types, and integrally intertwined therewith by needling.
  • At least one of the bases is formed of soft-twisted warp yarns (MD yarns) or weft yarns (CD yarns) including core-in-sheath composite fibers.
  • the base is formed of warp yarns and weft yarns and has an ended structure.
  • the base is wound a plurality of times into a stacked base.
  • the soft-twisted warp yarns (MD yarns) or weft yarns (CD yarns) including the core-in-sheath composite fibers of the stacked base are flat. Interstices between the yarns are closed by a melted low-melting-point component of the batt fibers including the core-in-sheath composite fibers and a melted low-melting-point component of the yarns.
  • the base comprises a multiple-ply woven fabric woven as at least a double-ply weave.
  • the soft-twisted warp yarns or weft yarns including the core-in-sheath composite fibers of the multiple-ply woven fabric are flat. Interstices between the yarns are closed by a melted low-melting-point component of the batt fibers including the core-in-sheath composite fibers and a melted low-melting-point component of the yarns.
  • either the warp yarns or the weft yarns of the base comprise yarns (preferably, soft-twisted yarns) including the core-in-sheath composite fibers and are twisted of filaments having a fineness ranging from 50 to 400 dtex.
  • the base according to the present invention has its yarns made flat because it is formed of yarns having certain fineness. Use of soft-twisted yarns is more effective to make themselves flatter.
  • the soft-twisted yarns have 30 through 100 final twists per meter, with the ratio of the number of preliminary twists/the number of final twists being in the range from 1.2 to 1.4.
  • the twisted yarns are soft-twisted yarns, the twisted yarns are easily made flat in the base, and hence have a function to increase the smoothing ability of the base.
  • the number of preliminary twists (and/or final twists) of the twisted yarns falls out of the range of 30 through 100 twists per meter, then the twisted wires become hard-twisted yarns, and are less liable to become flat in the base.
  • the ratio of (the number of preliminary twists)/(the number of final twists) falls in the range from 1.2 to 1.4, then the twisted yarns easily become flat in the base, and are stable soft-twisted yarns free of kinks and loose strands. If the ratio of (the number of preliminary twists)/(the number of final twists) falls out of the range from 1.2 to 1.4, then the twisted yarns become crooked in the base, and are not uniformly flat.
  • the soft-twisted yarns (twisted yarns) according to the present invention comprise bundles of filaments including core-in-sheath composite fibers.
  • the proportion of filaments in the core-in-sheath composite fibers should preferably be in the range from 25 % to 75 % with respect to the total number of filaments of the twisted yarns.
  • the first reason for the above proportion is that if the proportion of filaments in the core-in-sheath composite fibers is smaller than 25 %, then they are not well secured to the batt fibers including the core-in-sheath composite fibers when melted, and have a poor function to keep the twisted yarns flat.
  • the second reason for the above proportion is that if the proportion of filaments in the core-in-sheath composite fibers exceeds 75 %, then the yarns become too flat, and are too strongly secured to the batt fibers including the core-in-sheath composite fibers when melted, making the water squeezing ability of the felt poor.
  • the soft-twisted yarns according to the present invention may be spun yarns comprising staple yarns having a fineness ranging from 6 to 50 dtex, which include core-in-sheath composite fibers.
  • the felt according to the present invention has an excellent wet paper web smoothing ability and an excellent fiber removal resisting ability because the soft-twisted yarns of the base are flat with the interstices between the yarns being closed.
  • the felt includes the base formed of warp yarns and weft yarns and having an ended structure.
  • the interstices between the soft-twisted yarns of the multiple-ply woven fabric are easily closed.
  • solvent-soluble filaments are used as the warp yarns (MD yarns) and the weft yarns (CD yarns) of the base, and woven into a woven fabric. Then, batt fibers are implanted on the woven fabric by needle punching. Thereafter, strands of the woven fabric are dissolved away to make the interstices between the yarns easier to be closed.
  • solvent-soluble filaments may be made of polyvinyl alcohol, acrylic resin, or polyester, they should preferably be made of water-soluble polyvinyl alcohol in particular.
  • the twisted yarns and the strands of the base are made of nylon or polyester. Particularly, nylon yarns are preferable as they are of excellent strength and durability.
  • the batt fibers including the core-in-sheath composite fibers are integrally intertwined with one or both surfaces of the base. According to the present invention, therefore, the low-melting-point component of the core-in-sheath composite fibers in the batt fibers and the low-melting-point component of the yarns of the base including the core-in-sheath composite fibers can be secured to each other when melted with heat. As a consequence, the bonding strength between the base and the batt fibers is increased, so that the felt has excellent fiber removal resistance.
  • the batt fibers including the core-in-sheath composite fibers are preferably used in the batt layer on the front side (the wet paper web side) of the base.
  • the batt layer on the front side of the base may be of a multilayer structure, and the content percentage of the core-in-sheath composite fibers may be higher stepwise from the front side of the base toward the wet paper web.
  • the nylon of the core component of the core-in-sheath composite fibers should preferably be nylon 6, nylon 66, nylon 46, nylon 610 or nylon 612.
  • nylon produced by polycondensation of nylon salt 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), or polycondensation of hexamethylenediamine dodecanedionate (nylon 612), is preferable.
  • nylon having a melting point of 200°C or higher as measured by a DSC (differential scanning calorimeter) is recited.
  • the binary copolymer nylon may be nylon 6/12, nylon 6/610, nylon 66/6, nylon 66/12, nylon 66/610, or the like.
  • the ternary copolymer nylon may be nylon 6/66/12, nylon 6/66/610, or the like.
  • copolymer nylons have melting points variable depending on the composition (the weight % of a copolymer component).
  • the copolymer nylons which can be used in the present invention are limited to those having a melting point up to 180°C.
  • At least one of the stacked bases of the felt for papermaking comprises soft-twisted yarns including core-in-sheath composite fibers.
  • the yarns make up the base, the yarns become flat, and the low-melting-point component of the batt fibers including the core-in-sheath composite fibers and the low-melting-point component of the yarns are melted to close interstices between the yarns.
  • the felt for papermaking has an excellent water squeezing ability, an excellent wet paper web smoothing ability, and an excellent fiber removal resisting ability.
  • the felt according to the present invention does not lose a wet paper web smoothing ability, prevents fibers from being removed, has a good water squeezing ability, and keeps the water squeezing ability at a high level for a long period of time.
  • the felt is also capable of high performance compatible with higher-speed operation of papermaking machines and higher pressurization in pressing zones thereof in recent years.
  • Fig. 2 is a cross-sectional view of felt for papermaking according to embodiments the present invention.
  • a felt 100 for papermaking comprises a base layer 200 and a batt fiber layer 300.
  • the batt fiber layer 300 is produced by integrally intertwining batt fibers (staple fibers) with the base layer 200 by needle punching.
  • the first base 210 and the second base 220 which are of different types are stacked one on the other.
  • the first base 210 and the second base 220 may be of the same kind insofar as the second base 220 satisfies the requirements of the present invention.
  • a woven fabric that is narrower than the felt 100 to be completed may be formed of warp yarns (MD yarns) and weft yarns (CD yarns). Thereafter, the woven fabric may be helically wound, and the edges of adjacent woven fabric strips may be joined together to produce a joined woven fabric for use as the first base 210.
  • MD yarns warp yarns
  • CD yarns weft yarns
  • a base that has the same width as the felt 100 to be completed and is formed of warp yarns (MD yarns) and weft yarns (CD yarns) may be coaxially wound into a base for use as the first base 210.
  • a base formed of warp yarns (MD yarns) bonded together by an adhesive or a base formed of nonwoven superposed warp yarns (MD yarns) and weft yarns (CD yarns) may be used as the first base 210.
  • the second base 220 is also stacked in addition to the first base 210, making up the base layer 200 as a whole.
  • the second base 220 comprises a woven fabric formed of warp yarns (MD yarns) 222 and weft yarns (CD yarns) 221.
  • either the warp yarns 222 or the weft yarns 221 comprise soft-twisted yarns including core-in-sheath composite fibers, which are made up of filaments having a fineness in the range from 50 to 400 dtex.
  • the other of the warp yarns 222 and the weft yarns 221 comprise a woven fabric formed of filaments or solvent-soluble filaments in the range from 50 to 600 dtex.
  • the batt fibers are integrally intertwined with the both surfaces of the base layer 200 by needle punching.
  • the batt fiber layer 300 which includes core-in-sheath composite fibers, is disposed as a batt layer on the front side (the wet paper web side) of the second base 220.
  • the low-melting-point component (sheath component) of the core-in-sheath composite fibers (staple fibers) included in the batt fiber layer 300 and the low-melting-point component (sheath component) of the core-in-sheath composite fibers (filaments) included in the soft-twisted yarns are fused and joined together.
  • the second base 220 (or a second base 230, 240 or 250) which has the features of the present invention is stacked on the first base 210, making up the overall base layer 200.
  • the first base 210 comprises a base having the following structure:
  • the felt 100 according to Inventive example 3 was produced by stacking a base 240, described below, as the second base instead of the base 220 according to Inventive example 1. Specifically, the second base 240 is stacked in place of the base 220 in Fig. 2 .
  • Fig. 3 is a cross-sectional view of a felt 100a for papermaking according to Comparative example 1.
  • the felt 100a according to Comparative example 1 comprises a first base 210 and a base 210 which has the same structure as the first base 210 and stacked on the first base 210.
  • the first base 210 and the base 210 make up a base layer 260.
  • a batt fiber layer 300 is stacked on the base layer 260 and is of the same structure as with the Inventive example 1.
  • the felts according to Inventive examples 1 through 4 and Comparative example 1 were circulatingly rotated around a pair of rolls at a speed of 2 m/min., and heated by hot air at 180°C. Then, a heated pressing roll having a surface temperature of 160°C was applied to the batt layer on the surface of the felt, so that a felt for papermaking was produced.
  • All the felts according to the inventive examples and comparative example were produced with the same amount (basis weight: g/m 2 ) of the batt fiber layer 300, and evaluated for a paper web smoothing index, an ability to be compressed and recovered, an ability to sustain the ability to be compressed and recovered, and a fiber removal resisting ability by the following process:
  • the tester operates as follows: A disk-shaped test piece is placed on a rotatable turntable, and a highly resistive rotary roll is held against the test piece to measure the amount of fibers removed from the test piece. In the experiment, the amount of removed fibers was measured after the turntable was rotated 5,000 times.
  • one of the stacked bases is formed of soft-twisted yarns including core-in-sheath composite fibers.
  • the yarns (twisted yarns) are flat with the interstices therebetween being closed by the melted low-melting-point component.
  • the felt 100 for papermaking according to the present invention had a good paper web smoothing ability, a good ability to be compressed and recovered, a good ability to sustain the ability to be compressed and recovered, and a good fiber removal resisting ability.
  • the two first bases 210 are stacked one on the other.
  • Each woven of MD yarns and CD yarns of the first bases 210 are identical to each other.
  • the felt 100a according to Comparative example 1 had a poor paper web smoothing ability, a poor ability to be compressed and recovered, a poor ability to sustain the ability to be compressed and recovered, and a poor fiber removal resisting ability.
  • the felt for papermaking according to the present invention is applicable as a felt, which can be pressurized in a pressing zone of a papermaking machine, for squeezing water from a wet paper web.

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  • Paper (AREA)
EP07768211A 2006-07-06 2007-07-05 Feutre servant à fabriquer du papier Withdrawn EP2042653A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006186296A JP4958491B2 (ja) 2006-07-06 2006-07-06 抄紙用フェルト
PCT/JP2007/063462 WO2008004622A1 (fr) 2006-07-06 2007-07-05 Feutre servant à fabriquer du papier

Publications (1)

Publication Number Publication Date
EP2042653A1 true EP2042653A1 (fr) 2009-04-01

Family

ID=38894589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07768211A Withdrawn EP2042653A1 (fr) 2006-07-06 2007-07-05 Feutre servant à fabriquer du papier

Country Status (6)

Country Link
EP (1) EP2042653A1 (fr)
JP (1) JP4958491B2 (fr)
KR (1) KR20090034832A (fr)
CN (1) CN101484635A (fr)
CA (1) CA2656889A1 (fr)
WO (1) WO2008004622A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110312239A1 (en) * 2009-02-26 2011-12-22 Ichikawa Co., Ltd. Papermaking felt
WO2014124111A1 (fr) 2013-02-06 2014-08-14 Astenjohnson, Inc. Tissu à base de feutre de presse présentant une réduction d'interférence
US8961742B2 (en) 2011-07-22 2015-02-24 Astenjohnson, Inc. Multiaxial press felt base fabric including cabled monofilaments

Families Citing this family (1)

* 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

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Publication number Priority date Publication date Assignee Title
JPH03104995A (ja) * 1989-09-19 1991-05-01 Daiwabo Co Ltd 抄紙用ニードルフェルト
US5549967A (en) 1995-05-04 1996-08-27 Huyck Licensco, Inc. Papermakers' press fabric with increased contact area
JP3269601B2 (ja) * 1996-01-29 2002-03-25 市川毛織株式会社 抄紙用ニードルフェルト
WO1998012371A1 (fr) * 1996-09-18 1998-03-26 Albany International Corp. Fils de materiau a haut module recouvert et tissus ainsi fabriques
JP3415787B2 (ja) * 1999-03-24 2003-06-09 市川毛織株式会社 抄紙用プレスフェルト
JP2002161492A (ja) * 2000-11-30 2002-06-04 Nippon Felt Co Ltd 製紙用複合ファブリック
JP4081293B2 (ja) 2001-04-27 2008-04-23 日本フエルト株式会社 製紙用フェルト
JP4565625B2 (ja) * 2003-12-15 2010-10-20 イチカワ株式会社 抄紙用プレスフェルト及び抄紙用プレス装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008004622A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110312239A1 (en) * 2009-02-26 2011-12-22 Ichikawa Co., Ltd. Papermaking felt
US8961742B2 (en) 2011-07-22 2015-02-24 Astenjohnson, Inc. Multiaxial press felt base fabric including cabled monofilaments
WO2014124111A1 (fr) 2013-02-06 2014-08-14 Astenjohnson, Inc. Tissu à base de feutre de presse présentant une réduction d'interférence
US9404218B2 (en) 2013-02-06 2016-08-02 Astenjohnson, Inc. Press felt base fabric exhibiting reduced interference

Also Published As

Publication number Publication date
JP4958491B2 (ja) 2012-06-20
KR20090034832A (ko) 2009-04-08
WO2008004622A1 (fr) 2008-01-10
CN101484635A (zh) 2009-07-15
CA2656889A1 (fr) 2008-01-10
JP2008013878A (ja) 2008-01-24

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