EP1739227A1 - Habillage pour machine à papier - Google Patents

Habillage pour machine à papier Download PDF

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Publication number
EP1739227A1
EP1739227A1 EP06114217A EP06114217A EP1739227A1 EP 1739227 A1 EP1739227 A1 EP 1739227A1 EP 06114217 A EP06114217 A EP 06114217A EP 06114217 A EP06114217 A EP 06114217A EP 1739227 A1 EP1739227 A1 EP 1739227A1
Authority
EP
European Patent Office
Prior art keywords
threads
layer
paper machine
machine clothing
layers
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Withdrawn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
EP06114217A
Other languages
German (de)
English (en)
Inventor
Arved H. Westerkamp
Hubert Walkenhaus
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 EP1739227A1 publication Critical patent/EP1739227A1/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Withdrawn legal-status Critical Current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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths
    • 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 invention relates to a papermachine fabric for dewatering a fibrous web in a machine producing a fibrous web with a scrim consisting of at least one layer of longitudinal threads and at least one layer of transverse threads crossing the longitudinal threads.
  • the invention relates to a press felt according to the preamble of claim 16.
  • Such a paper machine clothing is for example from the European Patent Application EP 1 357 223 A1 known. It is proposed that the mutually parallel longitudinal threads and the mutually parallel transverse threads are glued together at intersections via an adhesive.
  • the adhesive may be, for example, a hot melt adhesive, diffusion adhesive, contact adhesive and / or reaction adhesive.
  • the use of the adhesive makes it possible to effect a direct connection between the longitudinal and transverse threads at the points of intersection, regardless of the material of the threads, be it bicomponent threads or single-component threads.
  • a disadvantage is in addition to the not inconsiderable manufacturing cost of papermachine clothing due to the use of an adhesive, together with its properties and peculiarities and the production-related predetermined and due to the mutually parallel alignment of the threads not optimal load distribution of the paper machine clothing for every application.
  • the invention is therefore the object of developing a paper machine clothing of the type mentioned so that in addition to optimal load distribution and a favorable pore size is guaranteed for each application.
  • This object is achieved in that at least one selection of threads of a layer with different distances are placed both symmetrically and asymmetrically to each other, wherein the distance between two adjacent threads in the course of their Geleges preferably changes.
  • the change of the respective distance can take place here continuously, abruptly, periodically, regionally and the like.
  • the preferably change in the distance between two adjacent threads preferably assumes a value ⁇ 1%, preferably ⁇ 3%, in particular ⁇ 5%, based on the length of a respective thread during its course.
  • This individual laying of at least one selection of threads of a layer for the first time provides a paper machine tension with a scrim which, in addition to the advantage of optimal load distribution, also affords the advantage of determinable and favorable pore sizes through the resulting "meshes" in a vertical arrangement of different layers.
  • the term "thread” is hereby broadest possible.
  • the thread may have been produced, for example, by means of additive and reductive production methods.
  • its material may include a PET, PA in all modifications, PP, PPS, PEK, PEKK, elastic PE, PBT, PTT, or combinations thereof. He can also be armed, for example fiber reinforced with glass fibers, carbon fibers and / or ceramic fibers.
  • it may also be a multi-component thread, such as a sheath-core thread, a side-by-side thread, and the like. Its properties, in particular tensile strength, elongation and the like, are generally not limited.
  • a selection of threads of both layers with different distances are placed both symmetrically and asymmetrically to each other. This allows, inter alia, improved load distributions with individual pore sizes of the yarn layer.
  • the threads of a layer may be laid symmetrically or asymmetrically in several groups relative to each other, and the groups of threads of a layer may in turn be laid symmetrically or asymmetrically with respect to each other.
  • the different distances are selected according to a pattern, randomly or in combination.
  • At least two adjacent layers of threads may be provided with at least partially the same or approximately the same orientation, which have a complementary positioning of threads to each other.
  • at least partially interspaces may be provided, which are filled with a permeable material, wherein the permeable material preferably comprises at least one polyurethane foam.
  • the complementary layers can optimally distribute the pressure pulses acting, for example, in a press of a paper or board machine and still have sufficient permeability.
  • the filling polyurethane foam is usually applied only when the scrim on a flat carrier medium, for example a fleece, is arranged. This is necessary because otherwise it would flow through the pores present in the scrim and thus would not give a homogeneous surface.
  • the pores depend on the viscosity of the polyurethane foam and the existing pore size.
  • a preferably full-area permeable layer is introduced at least in some areas between the two adjacent layers of threads.
  • the threads of two adjacent layers arranged one above the other can have at least one different property at least in some areas. They can complement each other in their function.
  • the threads of a layer have the at least one different property alternately and offset from the threads of the adjacent layer.
  • a constant overall feature is obtained with simultaneously optimized permeability and / or pressure retention.
  • the different property is preferably at least the thread thickness, the thread hardness, the thread structure, the thread material or the like.
  • the thread may be a nonwoven strip or a ribbon, and it is conceivable that in addition to the load-absorbing function, these also assume other functions, such as the generation of internal volume or return capacity.
  • two adjacent layers of threads can extend at an angle ⁇ at least in regions, wherein the angle can preferably assume a value in the range of 0 ° ⁇ ⁇ ⁇ 90 °.
  • the threads can thus be used, for example, in longitudinal, transverse and / or diagonal alignment with each other.
  • the threads of a single layer at an angle to each other can run.
  • the paper machine clothing can also have at least two, preferably several layers of yarn layers according to the invention, wherein preferably at least two, preferably all layers of yarn layers can be separated from one another by a respective separating layer.
  • the separating layers must, however, in the final stage of Beêtsher ein enter into an intimate connection with the Fadengelegen.
  • the papermachine clothing is a press felt for dewatering a fibrous web in a machine producing a fibrous web with a scrim consisting of at least one layer of longitudinal threads and at least one layer of transverse threads crossing the longitudinal threads, wherein it has at least one fine nonwoven layer on the fibrous web side, at least one coarse nonwoven layer on the support side and between the two nonwoven layers has a middle layer with a described Garngelege.
  • the fine nonwoven layer preferably has a fiber weight ⁇ 5 dtex
  • the coarse nonwoven layer preferably has a fiber weight ⁇ 50 dtex.
  • the nonwoven layer may also consist of a mixture of different fibers, in which case preferably the fibers with the largest proportion by weight define the criterion "fine” versus "coarse".
  • the threads of the middle layer can be filled in their two side regions with a permeable material, in particular polyurethane foam.
  • a permeable material in particular polyurethane foam.
  • the filling polyurethane foam is as a rule applied only when the scrim is arranged on a flat carrier medium, for example a nonwoven.
  • FIG. 1 shows a schematic sectional view of an embodiment of a papermachine clothing 1 according to the invention.
  • the papermachine fabric 1 is used for dewatering a fibrous web, not shown in a fibrous web producing machine and it includes a scrim 2 a layer A of longitudinal yarns 3.1 to 3.6 and a layer B to the longitudinal yarns 3.1 to 3.6 crossing transverse threads 4, with only a transverse thread 4 visible is.
  • the threads 3.1 to 3.6 of the layer A are placed symmetrically or asymmetrically in several groups G 1 to G 3 to each other, wherein the groups G 1 to G 3 of threads 3.1 to 3.6 of the layer A in turn are symmetrical or asymmetrical to each other.
  • the different distances A 1 to A 5 are selected in the embodiment of Figure 1 according to a pattern, but they can also be selected randomly or in combination.
  • the longitudinal threads 3.1 to 3.6 of the layer A and the transverse threads 4 of the layer B extend at least partially at an angle ⁇ which assumes a value in the range of 0 ° ⁇ ⁇ ⁇ 90 °.
  • FIG. 2 shows a partial and schematic sectional view of a second embodiment of the papermachine clothing 1 according to the invention.
  • two layers of yarns 2 and 5 adjacent layers C, D of yarns 5.1 to 5.6 and 6.1 to 6.6 are provided with at least partially the same or approximately the same orientation and at least in some areas at least one different property, which is a complementary pairwise positioning of threads 5.1, 6.1, 5.2, 6.2, 5.3, 6.3, 5.4, 6.4, 5.5, 6.5, 5.6 and 6.6 have to each other.
  • the different property is in the illustrated embodiment, the thread thickness, in a further embodiment, however, it may be the thread hardness, the thread structure, the thread material or the like.
  • the permeable material 9 here comprises at least one polyurethane foam 10.
  • a preferably full-surface permeable layer 11 is at least partially introduced between the two adjacent layers C, D of threads 5.1 to 5.6 and 6.1 to 6.6 and the two adjacent layers C, D of threads 5.1 to 5.6 and 6.1 to 6.6 run at least partially under a Angle ⁇ , which assumes a value in the range of 0 ° ⁇ ⁇ ⁇ 90 °.
  • the angle ⁇ assumes a value in the range of 0 °, that is, the same or approximately the same orientation.
  • FIG. 3 shows a partial and schematic sectional view of a third embodiment of the papermachine clothing 1 according to the invention.
  • the threads 12.1 to 12.5 of the layer E have the at least one different property alternately and offset from the threads 13.1 to 13.5 of the adjacent layer F.
  • the different property is in the illustrated embodiment, the thread thickness, in a further embodiment, however, it may be the thread hardness, the thread structure, the thread material or the like.
  • the thread 12.1 of the layer E has a small thread thickness
  • the adjacent thread 13.1 of the layer F has a large thread thickness
  • the adjacent thread 12.2, 13.2 of the same layer E, F in turn has a contrary thread thickness.
  • the two adjacent layers E, F of threads 12.1 to 12.5 and 13.1 to 13.5 extend at least regionally at an angle ⁇ which assumes a value in the range of 0 ° ⁇ ⁇ ⁇ 90 °.
  • the angle ⁇ assumes a value in the range of 0 °, that is, the same or approximately the same orientation.
  • the scrim 2 illustrated in FIGS. 1 to 3 can be, for example, part of a middle layer 15 of a press felt 14 which also has a fine nonwoven layer 16 on the fibrous web side and a coarse nonwoven layer 17 on the support side.
  • the middle layer 15 arranged between the two nonwoven layers 16, 17 may also have further layers of threads.
  • the illustrated threads 5.1 to 5.6 and 6.1 to 6.6 of the middle layer 15 in its two side regions H, I can be filled with a permeable material 18, in particular polyurethane foam.
  • the preferably full-surface permeable layer 11 does not necessarily have to be present in this embodiment.
  • FIG. 4 shows a plan view of exemplary courses of adjacent threads 3.1 to 3.11 of a layer.
  • the threads 3.1 to 3.11 can be arranged here in the longitudinal direction, as well as in the transverse direction, as well as in combination.
  • the respective distance B 1 to B 6 of two adjacent threads 3.1 to 3.11 changes in the course of their condition.
  • the change of the respective distance B 1 to B 6 can be continuous (threads 3.1, 3.2), discontinuous (threads 3.3, 3.4), periodic, regionally (threads 3.5, 3.6), permanently varying (threads 3.7, 3.8: 3.10, 3.11) , pseudo-parallel (threads 3.9, 3.10) and the like.
  • the courses shown are, as already mentioned, purely exemplary. Of course, it is also possible for there to be other courses, not shown, as well as combinations of courses.

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  • Paper (AREA)
EP06114217A 2005-07-01 2006-05-19 Habillage pour machine à papier Withdrawn EP1739227A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005030773A DE102005030773A1 (de) 2005-07-01 2005-07-01 Papiermaschinenbespannung

Publications (1)

Publication Number Publication Date
EP1739227A1 true EP1739227A1 (fr) 2007-01-03

Family

ID=37012119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06114217A Withdrawn EP1739227A1 (fr) 2005-07-01 2006-05-19 Habillage pour machine à papier

Country Status (3)

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US (1) US20070000633A1 (fr)
EP (1) EP1739227A1 (fr)
DE (1) DE102005030773A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040282A1 (de) 2008-07-09 2010-01-14 Voith Patent Gmbh Verfahren und Vorrichtung zur Herstellung eines Fadengeleges

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6425985B1 (en) * 1998-06-10 2002-07-30 Tamfelt Oyj Abp Method of manufacturing press felt, and press felt
US6525985B2 (en) 1995-08-31 2003-02-25 Hitachi, Ltd. Semiconductor memory device
EP1357223A1 (fr) * 2002-04-25 2003-10-29 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Toile pour machine à papier et son procédé de fabrication
WO2004099496A1 (fr) * 2003-05-05 2004-11-18 Asten Johnson, Inc. Tissu de base multiaxial en feutre presse
WO2005075733A1 (fr) * 2004-02-06 2005-08-18 Voith Paper Patent Gmbh Housse de machine a papier de structure modulaire

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3629047A (en) * 1970-02-02 1971-12-21 Hercules Inc Nonwoven fabric
US3920511A (en) * 1971-12-06 1975-11-18 Albany Int Corp Non-woven papermakers felt
CH630974A5 (de) * 1977-12-15 1982-07-15 Siebtuchfabrik Ag Papiermaschinensieb.
US4806413A (en) * 1986-03-26 1989-02-21 Asten Group, Inc. Papermaker's felt containing scrim material
US4781967A (en) * 1987-10-07 1988-11-01 The Draper Felt Company, Inc. Papermaker press felt
US5025839A (en) * 1990-03-29 1991-06-25 Asten Group, Inc. Two-ply papermakers forming fabric with zig-zagging MD yarns

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6525985B2 (en) 1995-08-31 2003-02-25 Hitachi, Ltd. Semiconductor memory device
US6425985B1 (en) * 1998-06-10 2002-07-30 Tamfelt Oyj Abp Method of manufacturing press felt, and press felt
EP1357223A1 (fr) * 2002-04-25 2003-10-29 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Toile pour machine à papier et son procédé de fabrication
WO2004099496A1 (fr) * 2003-05-05 2004-11-18 Asten Johnson, Inc. Tissu de base multiaxial en feutre presse
WO2005075733A1 (fr) * 2004-02-06 2005-08-18 Voith Paper Patent Gmbh Housse de machine a papier de structure modulaire

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Publication number Publication date
DE102005030773A1 (de) 2007-01-11
US20070000633A1 (en) 2007-01-04

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