EP2157235A1 - Feutre de presse - Google Patents

Feutre de presse Download PDF

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Publication number
EP2157235A1
EP2157235A1 EP09166665A EP09166665A EP2157235A1 EP 2157235 A1 EP2157235 A1 EP 2157235A1 EP 09166665 A EP09166665 A EP 09166665A EP 09166665 A EP09166665 A EP 09166665A EP 2157235 A1 EP2157235 A1 EP 2157235A1
Authority
EP
European Patent Office
Prior art keywords
press felt
polymer material
elastomeric polymer
paper
running
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Withdrawn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
EP09166665A
Other languages
German (de)
English (en)
Inventor
Bob Crook
Clifton Wilder
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2157235A1 publication Critical patent/EP2157235A1/fr
Withdrawn legal-status Critical Current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
    • D21F7/10—Seams thereof

Definitions

  • the invention relates to a press felt for a paper, board or Tissuemaschine, which can be made endless by a pintle in the machine.
  • the object is achieved by a press felt for a paper, board or tissue machine with an open, load-bearing basic structure.
  • the basic structure of the press felt has viewed in the longitudinal direction of the press felt one-sided seam loops and to these spaced other end-side seam loops.
  • the single-sided seam loops and the other end-side Seam loops are for endless make the press felt merge and engageable with each other so that a passage opening is formed, through which a pintle wire is feasible.
  • the press felt further has a running-side nonwoven fabric structure disposed on the base structure and providing the running side of the press felt.
  • the running side nonwoven fabric structure has one end portion as viewed in the longitudinal direction of the press felt and another end portion spaced from the one end portion. Viewed in the longitudinal direction of the press felt, the single end and the other end side seam loops each extend at least partially over the end portions of the running side nonwoven fabric structure.
  • an elastomeric polymer material is furthermore provided on at least one end section of the running-side fiber fleece structure, which is formed from a polymer or prepolymer introduced into the press felt in the liquid state and subsequently solidified or hardened.
  • the elastomeric polymer material extends at least in sections into the basic structure in the at least one end section and in the thickness direction of the press felt as viewed from the running-side nonwoven structure.
  • the two end portions of the running-side fiber fleece structure extend within the meaning of the invention in each case only over a part of the length of the running side fiber fleece structure.
  • the two end portions also limit the running side nonwoven structure in the length thereof.
  • the one-sided and the other end-side seam loops further limit the basic structure in their length.
  • the elastomeric polymer material may in this case only be arranged on at least one end of the running-side fiber fleece structure or, viewed in the longitudinal direction of the press felt, extend wholly or partly in the at least one end section.
  • the elastomeric polymer material may extend in the longitudinal direction of the Press felt also considered to extend beyond the at least one end portion.
  • an elastomeric polymer material is introduced at the points in the seam area, which are responsible for the anchoring of the fibers of the running side fiber fleece layer in the basic structure in the region of the seam.
  • the elastomeric polymeric material does not extend into the passageway formed by the suture loops.
  • the elastomeric polymer material is arranged at both end sections of the running-side fiber fleece structure and, in particular, does not extend into the passage opening formed by the seam loops.
  • the elastomeric polymer material extends only in the at least one end section or only in the two end sections.
  • a portion of the running-side fiber fleece structure is formed in which no introduced in the liquid state elastomeric polymer material is arranged.
  • an elastomeric polymer material is essentially introduced only at the points in the seam area, which are responsible for anchoring the fibers of the running side fiber fleece layer in the basic structure in the region of the seam. Due to the short length of the at least one end portion or the two end portions of the running side nonwoven fabric layer which is or are impregnated with the polymer material in relation to the length of the press felt, the marking tendency is not or only slightly increased by the polymer material.
  • a preferred embodiment of the invention provides that the elastomeric polymer material seen in the longitudinal direction of the press felt in the at least one end portion to a length of up to about 2 inches, preferably from up to about 1 inch, more preferably to about 1 ⁇ 2 inch , most preferably extending up to about 1 ⁇ 4 inch. It is also conceivable that the elastomeric polymer material extends to a length of at least 1/32 inch, more preferably 1/16 inch. Preferably, as viewed in the longitudinal direction of the press felt, the elastomeric polymeric material extends in each of the two end portions to a length of up to about 2 inches, preferably up to about 1 inch, more preferably to about 1/2 inch, most preferably up to about 1 ⁇ 4 inch.
  • the polymeric material is preferably incorporated in an amount in the range of 50g / m 2 to 500g / m 2 in the press felt.
  • the press felt when used as intended in the paper, board or tissue machine, is moved along a transport direction directed parallel to the longitudinal direction of the press felt, it is particularly expedient if the at least one end section in which the elastomeric polymer material is introduced, viewed in the direction of transport, the rear side both end sections is.
  • the elastomeric polymeric material is further disposed on the entire width of the press felt, i. the elastomeric polymer material forms a strip which extends across the longitudinal direction of the press felt over the entire width of the press felt.
  • the elastomeric polymer material it is possible for the elastomeric polymer material to extend uninterrupted or interrupted over the entire width of the press felt. In the latter case, the elastomeric polymer material forms on the width of the Press felt a plurality of successively arranged segments.
  • the basic structure is preferably needled with the running-side fiber fleece structure.
  • An advantageous embodiment of the invention provides that a paper-side nonwoven structure providing the paper side of the press felt is arranged on the basic structure.
  • the paper-side nonwoven fabric structure with the basic structure is needled.
  • the running side and / or paper-side nonwoven fabric structure may be constructed of at least one nonwoven fabric layer.
  • the paper-side nonwoven fabric structure has an end-side end portion and another end-side portion viewed in the longitudinal direction of the press felt, the two end portions of the paper-side nonwoven structure abutting each other in an endless state of the press felt, and one of the two end portions of the paper-side nonwoven structure overlaps the through opening in the longitudinal direction of the press felt. This means that the paper-side non-woven fabric structure extends, in particular, over the entire length of the press felt, and an end portion of the paper-side nonwoven structure bridges the passage opening.
  • fibers of the running-side non-woven structure and threads of the basic structure are at least partially embedded in the elastomeric polymer material.
  • the anchoring of the running-side fiber fleece structure into the basic structure is further improved.
  • the elastomeric polymer material at the at least one end portion of the running side nonwoven fabric structure spaces partially filled between fibers of the running side nonwoven fabric structure and / or between threads of the base structure and / or between fibers of the running side nonwoven structure and filaments of the basic structure, and partially filled / or bypasses. It is thereby achieved that a composite structure created from the elastomeric polymeric material and fibers and / or filaments is permeable, i. the permeability of the press felt in the seam area is not adversely affected.
  • the elastomeric polymer material has a foam structure, in particular a closed cellular foam structure. This is possible, for example, by introducing CO 2 in the preparation of the liquid polymer or prepolymer which forms gas bubbles in the cured polymer material or in which CO 2 is formed in the curing reaction.
  • the basic structure may comprise longitudinal threads and transverse reinforcement elements connected thereto.
  • the seam loops can be formed by the longitudinal threads, wherein the longitudinal threads in the region of the seam loops are preferably not connected to the transverse reinforcement elements, but in the area outside the seam loops.
  • the longitudinal threads forming the seam loops can be designed as monofilament threads, whereby a passage of the insert wire through the passage opening formed by the seam loops is considerably simplified.
  • the transverse reinforcement elements can be formed, for example, by transverse threads, wherein the transverse threads can be formed, for example, by multifilament threads. If the basic structure is formed, for example, by a fabric of longitudinal threads and transverse threads, then the longitudinal threads in the region of the seam loops are not with the Cross threads interwoven, outside the seam loops, the longitudinal threads are interwoven with the transverse threads.
  • the transverse threads and the longitudinal threads of the basic structure may be formed from or comprise polyamide.
  • At least one further filler thread extending parallel to the transverse threads is arranged, which differs in structure and / or material from the transverse threads.
  • This filling thread is preferably composed of two components, namely a first and a second component, wherein the first component has a higher strength, in particular with respect to shear forces, than the second component and wherein the second component has a lower melting temperature than the first component.
  • the first component may in particular be PA with a strength of more than 30 g / tex.
  • the second component may be a co-polyamide having a melting temperature in the range of about 100-140 ° C.
  • the at least one filling thread is in particular introduced before the paper-side and the running-side fiber fleece structure is needled with the basic structure. This ensures that fibers of the two non-woven fabric structures are needled into the at least one filling thread.
  • the at least one filling thread may be useful if the at least one filling thread is at least partially embedded in the elastomeric polymer material.
  • the elastomeric polymeric material is formed from a moisture-curing prepolymer which is in a liquid state was introduced and subsequently hardened with crosslinking or cured.
  • the elastomeric polymer material may in this case comprise polyurethane or polyurea or be formed from one of these materials.
  • a moisture-curing prepolymer has the advantage that it is solvent-free and crosslinked by the reaction with ambient moisture. Further, a moisture-curing prepolymer may be introduced immediately after the felt has been pulled in the machine.
  • Polyurea has the advantage that it forms an extremely strong compound with threads and fibers which are formed from polyamide, as a result of which the fibers and / or threads at least partially embedded in the polyurea are bound to the polyurea extremely firmly to the polyurea , which in turn has a very positive effect on the wear behavior of the press felt according to the invention. It would also be conceivable to use a moisture-curing polyurethane as the prepolymer.
  • Moisture-curing prepolymers are preferably prepolymers having isocyanate end groups, wherein the prepolymers may in turn be prepared from diisocyanates and diamines or from diisocyanates and diols.
  • MDI or polymeric MDI come into consideration.
  • the diols and diamines are preferably polytetrahydrofurans, polybutylene oxides, polypropylene oxide, polyethylene oxide having hydroxy or amino end groups.
  • diols are used to make the prepolymer, the final cured polymer contains urea and urethane compounds.
  • diamines are used to make the prepolymer, essentially only urea groups are formed when the prepolymer is cured.
  • the curing of the moisture-curing prepolymer is preferably carried out at a temperature in the range of 20 ° C to 80 ° C.
  • the moisture-curing prepolymer may be subjected to a steam or water treatment. If the press felt, for example, with only partially cured cured prepolymer in the paper machine, the full curing of the prepolymer and formation of the polymer material in the paper machine is accelerated by the prevailing humid environment.
  • the prepolymers may be diluted with solvent to adjust the appropriate viscosity necessary for incorporation into the base structure and / or nonwoven structure.
  • a suitable solvent is, for example, tetrahydrofuran.
  • suitable catalysts for example dimorpholinodiethyl ether or metal catalysts, can be used.
  • the isocyanate content in the prepolymers used in the invention is preferably between 3 wt% and 30 wt%, in particular between 6 wt% and 16 wt%.
  • the polymer introduced into the press felt in the liquid state may, for example, also be polymer particles which are present in an aqueous dispersion. It is also conceivable that the polymer material is dissolved in a solvent.
  • a further elastomeric polymer material to be introduced into the paper-side fiber fleece structure which extends in the longitudinal direction of the press felt, extends in the region of at least one of the two end sections of the paper-side fiber fleece structure, but does not extend into the passage opening formed by the seam loops.
  • the further elastomeric polymer material may extend in the region of the at least one end portion in the longitudinal direction of the press felt to a length of about 1/16 inch to about 1 ⁇ 4 inch, preferably about 1/16 inch to about 1 ⁇ 2 inch.
  • the further elastomeric polymeric material may be the same polymeric material as the elastomeric polymeric material incorporated into the nonwoven fibrous running side structure.
  • the further elastomeric polymer material may be introduced onto a paper-side non-woven fabric layer already arranged on the base structure before a paper-side nonwoven fabric layer providing the paper side of the press felt is arranged on the already arranged paper-side nonwoven fabric layer.
  • the further elastomeric polymer material viewed in the direction of thickness of the press felt, does not extend to the paper side of the press felt.
  • the polymer material in the paper-side fiber fleece structure does not extend to the paper side in the area of the seam loops.
  • a load-bearing and open-type basic structure viewed in the longitudinal direction of the press felt has end-side seam loops and other end-side seam loops, which are endless for making the press felt merge and engageable with each other, that a passage opening is formed, through which a pintle is feasible ,
  • a running-side non-woven fabric structure providing the running side of the press felt to be produced is arranged, which in the longitudinal direction has a single-end and another end-side end portion.
  • the running side fiber fleece structure becomes with its longitudinal direction oriented parallel to the longitudinal direction of the base structure and arranged on the base structure such that the seam loops at one end of the base structure extend over the one end of the running side fiber fleece structure and the seam loops at the other end of the base structure over the other end of the running side fiber fleece structure.
  • the longitudinal direction of the base structure and that of the running nonwoven structure determine the longitudinal direction of the press felt.
  • a paper-side fibrous nonwoven structure providing the paper side is disposed on the opposite side of the base structure.
  • the running-side fiber fleece structure, the paper-side nonwoven fabric structure and the basic structure are, for example, interconnected by needling.
  • a liquid polymer or prepolymer is introduced into the running-side fiber fleece structure on at least one of its end sections in such a way that it extends into the basic structure in the at least one end section from the running-side fiber fleece structure. After incorporation of the liquid polymer or prepolymer, it is cured to form an elastomeric polymeric material.
  • the introduction of the polymer or prepolymer takes place here in particular in such a way that the polymer material does not extend into the passage opening formed by the seam loops.
  • a pipette or syringe can be used to introduce the liquid polymer or prepolymer.
  • liquid polymer or prepolymer prior to insertion of the pintle into the passage opening or is introduced after its introduction. It is also conceivable that the liquid polymer or prepolymer is introduced after the press felt is retracted in the paper machine.
  • the sole figure shows a press felt 1 according to the invention for a paper, board or tissue machine in an endless state in a section in the longitudinal direction MD of the press felt 1.
  • the press felt has a load-bearing and open-made basic structure 2, in the present example by a fabric is formed.
  • the fabric is formed by longitudinal threads 18 and transverse threads 19 interwoven therewith.
  • the basic structure 2 is delimited in the longitudinal direction MD of the press felt 1 by one end 3 and by another end 4, wherein one end is formed by first seam loops 7 and the other end 4 by second seam loops 8.
  • the seam loops 7, 8 are formed by longitudinal threads 18, wherein the longitudinal threads 18 are not interwoven in the area of the seam loops 7, 8 with the transverse threads 19.
  • the press felt 1 further comprises a running side nonwoven fabric structure 6 providing the running side 5 of the press felt 1, which is arranged on the basic structure 2.
  • the running-side nonwoven fabric structure 6 is viewed in the longitudinal direction of the press felt, bounded by a first end 20 and a second end 21.
  • the running side fiber fleece structure 6 is deposited on the base structure 2 and connected to this, that seen in the longitudinal direction MD of the press felt 1, the first seam loops 7 on the first end 20 of the nonwoven structure 6 and the second Seam loops 8 extend over the second end 21 of the nonwoven structure 6.
  • the press felt 1 is made endless by the first and the second seam loops 7, 8 being brought together so that they interlock and thereby form a passage opening 9 extending over the width of the press felt 1, through which a pintle 10 is guided.
  • an elastomeric polymer material 11 which extends in the thickness direction d of the press felt 1 viewed from the running side nonwoven structure 6 in the basic structure 2 and which viewed in the longitudinal direction MD of the press felt 1, at both ends 20, 21 of the running side nonwoven fabric structure 6 but is arranged in the region of the passage opening 9 formed by the seam loops 3, 4.
  • the elastomeric polymer material 11 formed from a liquid polymer or prepolymer was introduced from the running side 5 into the running-side nonwoven fabric structure 6. Furthermore, fibers of the running-side fiber fleece structure 6 and threads 18, 19 of the basic structure 2 are preferably at least partially embedded in the elastomeric polymer material 11.
  • the elastomeric polymer material 11 fills and / or bridges in a one end 20 comprehensive end-end portion B1 of the running side nonwoven structure 6 partially spaces formed between fibers of the running side nonwoven structure 6 and / or between threads 18, 19 of the basic structure 2, so that in the The composite structure made of fibers, threads 18, 19 and elastomeric polymer material 11 created in the end section B1 is permeable.
  • the elastomeric polymer material 11 in a second end-side end section B2 comprising the other end 21 of the running-side nonwoven structure 6 partially fills and / or bridges spaces formed between fibers of the running-side nonwoven structure 6 and / or between threads 18, 19 of the basic structure 2 the composite structure of fibers, filaments 18, 19 and elastomeric polymer material 11 created in the end section B2 is permeable.
  • the threads 18, 19 of the basic structure 2 may preferably be formed from or at least comprise polyamide. It is also conceivable that at least the fibers of the running side nonwoven structure 6 are formed from polyamide or at least comprise polyamide.
  • the elastomeric polymer material was preferably formed by introducing a liquid and moisture-curing prepolymer into the press felt 1 from the running side 5 and then curing it.
  • the elastomeric polymer material 11 is arranged only in the end sections B1, B2 of the two ends 20, 21 of the running side nonwoven structure 6.
  • the end sections B1, B2 in this case preferably extend in the longitudinal direction MD of the press felt 1 only over a length of about 1/32 inch to about 1 ⁇ 2 inch, preferably about 1/16 inch to about 1 ⁇ 4 inch.
  • the elastomeric polymer material is arranged over the entire width of the press felt 1.
  • the elastomeric polymer material 11 has a foam structure, in particular a closed cell Has foam structure. This is possible, for example, by introducing CO 2 in the production of the liquid polymer or prepolymer which forms gas bubbles in the cured elastomeric polymer material.
  • the elastomeric polymer material extends only from the running side 6 into the basic structure 2. In general, it can be said that it makes sense to reduce the marking tendency in the seam area when the elastomeric polymer material 11, viewed in the thickness direction d of the press felt 1, does not extend to the paper side 12 of the press felt 1.
  • a paper-side nonwoven structure 13 providing the paper side 12 of the press felt 1 is also provided on the basic structure 2, which may be formed by an upper nonwoven layer 14 and a middle nonwoven layer 15 between the basic structure 2 and the upper nonwoven layer 14, for example upper nonwoven fabric layer 14 is formed of finer fibers than the middle nonwoven fabric layer 15.
  • the paper-side nonwoven fabric structure 13 seen in the longitudinal direction MD of the press felt 1 has one end portion 16 and another end portion 17 between which the paper-side nonwoven fabric structure 13 extends.
  • the two end portions 16, 17 of the paper-side nonwoven fabric 13 are preferably abutted with each other, and one of the two end portions of the paper-side nonwoven fabric 13, that is the end portion 17 in the longitudinal direction MD of the press felt 1, is the through-hole 9 covered.
  • the elastomeric polymeric material 11 is in FIG Viewed longitudinal direction MD of the press felt 1 only at the two end portions 20, 21 of the running side fiber fleece structure 6, without extending into the region of the formed by the seam loops 7.8 through opening 9. Further, when viewed in the longitudinal direction MD of the press felt 1, the elastomeric polymer material 11 in the running side non-woven fabric structure 6 does not extend in a region disposed between the two end portions 20, 21.

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EP09166665A 2008-08-20 2009-07-29 Feutre de presse Withdrawn EP2157235A1 (fr)

Applications Claiming Priority (1)

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US90338608P 2008-08-20 2008-08-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015024718A1 (fr) * 2013-08-22 2015-02-26 Voith Patent Gmbh Entoilage, en particulier feutre de presse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695827A2 (fr) * 1994-06-09 1996-02-07 Albany International Corp. Procédé de jonction de bandes de transfert et autres bandes pour le traitement du papier
EP0962587A2 (fr) * 1998-05-30 1999-12-08 Scapa Group Plc Améliorations relatives à des joints pour toiles
WO2002035000A1 (fr) * 2000-10-23 2002-05-02 Albany International Corp. Ameliorations de toiles de fabrication de papier cousues
US20080092980A1 (en) * 2005-08-26 2008-04-24 Bryan Wilson Seam for papermachine clothing
US20080190580A1 (en) * 2007-02-09 2008-08-14 CROOK Robert Press fabric seam area

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695827A2 (fr) * 1994-06-09 1996-02-07 Albany International Corp. Procédé de jonction de bandes de transfert et autres bandes pour le traitement du papier
EP0962587A2 (fr) * 1998-05-30 1999-12-08 Scapa Group Plc Améliorations relatives à des joints pour toiles
WO2002035000A1 (fr) * 2000-10-23 2002-05-02 Albany International Corp. Ameliorations de toiles de fabrication de papier cousues
US20080092980A1 (en) * 2005-08-26 2008-04-24 Bryan Wilson Seam for papermachine clothing
US20080190580A1 (en) * 2007-02-09 2008-08-14 CROOK Robert Press fabric seam area

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015024718A1 (fr) * 2013-08-22 2015-02-26 Voith Patent Gmbh Entoilage, en particulier feutre de presse

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