EP1672119B1 - Procédé de raccordement des extrémités d'une toile multi-couches pour machine à papier - Google Patents

Procédé de raccordement des extrémités d'une toile multi-couches pour machine à papier Download PDF

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Publication number
EP1672119B1
EP1672119B1 EP05109341A EP05109341A EP1672119B1 EP 1672119 B1 EP1672119 B1 EP 1672119B1 EP 05109341 A EP05109341 A EP 05109341A EP 05109341 A EP05109341 A EP 05109341A EP 1672119 B1 EP1672119 B1 EP 1672119B1
Authority
EP
European Patent Office
Prior art keywords
layer
free ends
layers
reinforcing strip
region
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.)
Not-in-force
Application number
EP05109341A
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German (de)
English (en)
Other versions
EP1672119A1 (fr
Inventor
David Beck
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
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Voith Patent GmbH
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Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1672119A1 publication Critical patent/EP1672119A1/fr
Application granted granted Critical
Publication of EP1672119B1 publication Critical patent/EP1672119B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21F1/0054—Seams thereof
    • 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

Definitions

  • the invention relates to a method for continuous forming a multi-ply papermachine fabric according to the preamble of patent claim 1.
  • Paper machine clothing is either closed or endless or open.
  • the two longitudinal ends are then connected to one another on the paper machine to produce an "endless covering".
  • an endless covering From practice, several methods for endlessly making such a papermachine fabric are known. In the production of an endless covering during their production, for example, the free ends are interwoven by hand or machine endlessly. Such a process is always very time consuming and therefore expensive. Also, the connection of the longitudinal ends of a fabric on the paper machine is difficult and time consuming.
  • the invention has for its object to provide a method of the type mentioned, with which the endless making a multi-ply paper machine clothing can be carried out more economically.
  • the layers in the region of their respective free ends are separated from each other, then the free ends of the respective layer are connected by at least partial mutual fusion, now between the layers a reinforcing strip covering the joints of the layers is arranged, and finally reinforcing strips and layers are mutually connected.
  • the seam or joint can be made stronger than the remainder of the fabric and have a permeability which is approximately identical to that of the remainder of the fabric.
  • such a connection region can have approximately the same thickness as the remaining rest of the fabric, so that the marking of the paper web is minimal.
  • the mutual melting or melting of the free ends of the respective layer thus serves primarily to connect the free ends of the respective layer with each other, whereas the connecting points covering reinforcing strip serves to ensure the necessary strength, in particular tensile and tear strength.
  • the mutual fusion of the free ends of the respective layer takes place under application of pressure and / or temperature, preferably a temperature of about 350 ° C. At such a temperature it is ensured that the covering melts and in so far a mutual connection of the free ends is made possible. It is clear that in a two-ply papermachine fabric, both outer plies, namely the free ends of the topsheet and the free ends of the backsheet, are joined together.
  • the free ends of the respective layer for performing the connection by means of mutual fusion top side are arranged on top, wherein preferably protruding portions of the free ends are separated beyond the junction of the respective layer in performing the connection operation.
  • This is on the one hand at least a line-shaped merging of the two free ends to be joined and on the other hand allows a clean completion of the free ends.
  • Such process steps can be carried out relatively easily and without problems.
  • the mutual fusion of the free ends takes place at least at the contact line of the two free ends when cutting off or cutting through the abovementioned projecting portions beyond the connection point.
  • Such a cut provides an easy-to-observe "end point" for the interconnection of the free ends of each ply.
  • the interconnected ends of the respective layer before performing the next steps of a smoothing treatment in the region of the respective joint is subjected, which smoothing treatment preferably with application of pressure and temperature by flat pressing the interconnected ends in the region of the respective joint and is preferably carried out with remelting of the layer in this area.
  • smoothing treatment preferably with application of pressure and temperature by flat pressing the interconnected ends in the region of the respective joint and is preferably carried out with remelting of the layer in this area.
  • This smoothening treatment may be performed by additionally applying a low stress of, for example, 1 pli (pounds per linear inch) (175 N / m) or less in opposite directions to the bonding area, followed by the aforementioned application of pressure and temperature.
  • a low stress for example, 1 pli (pounds per linear inch) (175 N / m) or less in opposite directions to the bonding area, followed by the aforementioned application of pressure and temperature.
  • the reinforcing strip is made of a polymeric aromatic aramid such as Kevlar® or the like, preferably about 90 ⁇ m (0.0035 inch) thick.
  • a reinforcing strip increases the strength in the region of the connection points, so that a covering can be obtained, which also has sufficient strength in the region of the connection points.
  • the reinforcing strip bridges the respective connection points and thus transfers the mechanical load from one side of the connection point to the other side of the connection point.
  • the reinforcing strip is formed so thin that its incorporation into the papermachine fabric whose thickness will only affect negligibly.
  • the Reinforcement strip may be a sheet-like textile structure, so that thereby the permeability of the fabric is hardly affected.
  • the joints of the individual layers are offset by at least 3 inches. This approach can provide advantages in terms of the strength of the endless screen, since a joint in one layer then always faces a continuous, unitary, unconnected part in the other layer.
  • the layers are connected to each other by means of a perforated adhesive layer.
  • the perforated adhesive layer preferably has a carrier layer of BOPET, such as, for example, Mylar®.
  • the adhesive layer is laminated to the top of the reinforcing strip.
  • On the underside of the reinforcing strip is preferably applied a hot-melt adhesive insert for connecting the reinforcing strip to one of the layers.
  • the adhesive layer therefore has an adhesive top side and an adhesive bottom side and, if it is located between two layers, is capable of firmly joining these layers together.
  • the hot-melt adhesive insert is preferably the product Rototherm®.
  • the reinforcing strip covers each of its associated joints on both sides by at least 3 inches each.
  • a connection region in which the joints of two layers are offset by 7.5 cm to each other, thus resulting in the reinforcing strip a total length of 3 x 7.5 cm, ie about 22.5 cm.
  • the required forces can be transmitted in the long term readily in the region of the joints. It may even be that the strength in the region of the joints is higher than in the remaining area of the fabric.
  • the connection area is stretched only insignificantly during operation of the paper machine, so that the covering has a long service life, at least in this area. It also follows that the erfi proper method is ultimately very economical.
  • FIGS. 1 to 4 relate to one of the layers of paper machine clothing 1; 4 shows a multilayer, namely two-ply papermachine clothing 1 with a first or upper ply 2 and a second or lower ply 3 in an endless state.
  • Figs. 1 to 3 show the endless making a layer of papermachine clothing.
  • FIGS. 1 to 3 the continuous operation of the first, upper layer 2 of the papermachine clothing 1 is shown.
  • the layer 2 has free ends, namely, according to FIGS. 1 to 3, a left free end 4 and a right free end 5, which are connected to each other by means of the method according to the invention.
  • each layer 2, 3 has a connection point 10, 11.
  • step (b) The mutual fusion of the free ends 4, 5; 6, 7 of the respective layer 2, 3 in the aforementioned step (b) takes place with local application of pressure and temperature, preferably a temperature of about 350 ° C.
  • step (a) After separating the layers from one another in step (a), the free ends 4, 5 of the respective layer 2, 3, as shown by way of example with reference to the first, upper layer 2 in FIG. 1, are performed to perform the step (b ) overlapping the upper side 13 on the upper side 14.
  • step (b ) overlapping the upper side 13 on the upper side 14.
  • projecting portions 15, 16 of the free ends 4, 5 beyond the junction 10, 11 of the respective sheet 2, 3 are separated.
  • step (b) the ends 4, 5 of the layer 2 which are joined together according to FIG. 2 are subjected to a smoothing treatment in the region of the respective joint in the exemplary embodiment according to FIGS. 1 to 5 before the steps (c) and (d) are carried out 3, this is the junction 10, subjected.
  • This smoothing treatment is carried out with application of pressure and temperature by flat pressing the interconnected ends 4, 5 and 6, 7 in the region of the respective connection point 10, 11 and preferably with re-melting of the layer 2 or 3 in this area.
  • step (b) the layer 2 of the papermachine fabric 1, which has been made endless in FIG. 3, then results.
  • Reinforcing strip 12 is made of Kevlar, preferably about 90 ⁇ m (0.0035 inch) thick, in accordance with a particularly preferred embodiment of the invention.
  • Such a reinforcing strip has a relatively high strength and can thus serve to transfer the forces occurring at a free end of each layer via the joint of the respective layer in the other free end of the respective layer without the overall strength of the paper machine clothing suffers.
  • the joints 10, 11 of the individual sheets 2, 3 are preferably offset from one another by at least 7.5 cm (3 inches). It follows that in Fig. 4, the connection points 10, 11 are not vertically with each other but, as mentioned above, offset from one another. This can be done by prior to the mutual joining of the ends of a free end of a layer and the other free end of the other layer, which other free end of the other layer is the free end of a layer approximately diagonally opposite, be shortened by the same amount ,
  • the layers 2, 3 of the papermachine fabric 1 are connected to one another by means of a perforated adhesive layer 17, which is preferably applied to a carrier layer of Mylar®.
  • This perforated adhesive layer is shown in dashed lines in Fig. 4.
  • the perforated adhesive layer 17 with the Mylar® carrier layer is therefore located in the middle between the two layers, it is provided on both sides with adhesive and therefore allows a firm connection between the layers 2 and 3.
  • the perforated adhesive layer 17 is laminated to the upper surface 20 of the reinforcing strip 12. Further, on the bottom 21 of the Reinforcing strip applied a hot melt adhesive insert 22 for connecting the reinforcing strip 12 with the lower layer 3 in FIG. 4.
  • the hot melt adhesive insert 22 is shown only in broken lines.
  • This hot melt adhesive liner 22 is an open mesh adhesive layer and should not block the flow of air through the papermachine fabric 1 as compared to the perforations in the perforated adhesive layer 17 with the Mylar® backing so that the impact of this additional hot melt adhesive liner 22 is minimal.
  • This hot-melt adhesive insert is, for example, a product which can be obtained under the name Rototherm®.
  • the reinforcing strip 12 covers each of its associated joints 10, 11 on either side by at least 7.5 cm (3 inches).
  • a total length of the reinforcing strip of 3 x 7.5 cm, i. 22.5 cm (about 9 inches) within positions 2 'to 5'.
  • the mutual fusion of the free ends of the respective layer and also the separation of the protruding portions 15, 16 beyond the joint 10 can be done by means of a hot wire or by means of a heated knife or a heated blade. Further, the mutual fusion or even the smoothing treatment of the interconnected ends of the respective layer by means of a vacuum binding system with application of heat and / or pressure can take place.

Landscapes

  • Paper (AREA)
  • Laminated Bodies (AREA)

Claims (11)

  1. Procédé de jonction des extrémités d'une toile multicouches (1) pour machine à papier, en particulier d'un tamis pour machine à papier,
    dans lequel les extrémités libres (4, 5; 6, 7) des couches (2, 3) respectives sont reliées les unes aux autres,
    caractérisé par les étapes suivantes :
    (a) séparation des couches (2, 3) l'une de l'autre dans la zone des extrémités libres (4, 5; 6, 7),
    (b) liaison des extrémités libres (4, 5; 6, 7) des couches (2, 3) respectives par fusion mutuelle au moins partielle des extrémités libres (4, 5; 6, 7) des couches (2, 3) respectives,
    (c) placement entre les couches (2, 3) d'un ruban de renfort (12) qui recouvre les emplacements de liaison (10,11) des couches (2, 3) et
    (d) liaison mutuelle du ruban de renfort (12) et des couches (2, 3).
  2. Procédé selon la revendication 1, caractérisé en ce que la fusion mutuelle des extrémités libres (4, 5; 6, 7) des couches (2,3) respectives de l'étape (b) s'effectue par application locale de pression et de chaleur, de préférence à une température d'environ 350° C.
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que les extrémités libres (4, 5; 6, 7) des couches (2,3) respectives sont disposées en superposant le côté supérieur (13) sur le côté supérieur (14) pour exécuter l'étape (b).
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que des parties (15, 16) qui débordent des extrémités libres (4, 5; 6, 7) des deux côtés de l'emplacement de liaison (10, 11) de chaque couche (2, 3) sont découpées de préférence lors de l'exécution de l'étape (b).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que les extrémités (4, 5; 6, 7) reliées l'une à l'autre des couches (2, 3) respectives subissent un traitement de lissage dans la zone de l'emplacement de liaison respectif (10, 11) avant l'exécution des étapes (c) et (d).
  6. Procédé selon la revendication 5, caractérisé en ce que le traitement de lissage est réalisé en appliquant une pression et de la chaleur en comprimant à plat les extrémités (4, 5; 6, 7) reliées l'une à l'autre dans la zone de l'emplacement de liaison (10, 11) respectif et de préférence en fondant de nouveau les couches (2, 3) dans cette zone.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le ruban de renfort (12) est réalisée en un matériau qui contient un aramide aromatique polymère, par exemple le Kevlar®, de préférence à une épaisseur d'environ 90 µm (0,0035 pouce).
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que les emplacements de liaison (10, 11) des différentes couches (2, 3) sont décalées l'un par rapport à l'autre d'au moins 7,5 cm (3 pouces).
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que les couches (2, 3) sont reliées l'une à l'autre au moyen d'une couche adhésive perforée (17), la couche adhésive (17) étant de préférence portée par une couche de support en BOPET, par exemple en Mylar®.
  10. Procédé selon la revendication 9, caractérisé en ce que la couche adhésive (17) est stratifiée sur le côté supérieur (20) du ruban de renfort (12) et en ce qu'une garniture adhésive (22) fusible à chaud est appliquée sur le côté inférieur (21) du ruban de renfort (12) pour relier le ruban de renfort (12) à l'une des couches (2, 3).
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que le ruban de renfort (12) recouvre sur au moins 7,5 cm (3 pouces) chacun des emplacements de liaison (10, 11) qui lui est associé, et ce sur les deux côtés.
EP05109341A 2004-12-17 2005-10-07 Procédé de raccordement des extrémités d'une toile multi-couches pour machine à papier Not-in-force EP1672119B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US63702104P 2004-12-17 2004-12-17

Publications (2)

Publication Number Publication Date
EP1672119A1 EP1672119A1 (fr) 2006-06-21
EP1672119B1 true EP1672119B1 (fr) 2007-10-03

Family

ID=35197905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05109341A Not-in-force EP1672119B1 (fr) 2004-12-17 2005-10-07 Procédé de raccordement des extrémités d'une toile multi-couches pour machine à papier

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Country Link
US (1) US20060180273A1 (fr)
EP (1) EP1672119B1 (fr)
AT (1) ATE374859T1 (fr)
DE (1) DE502005001618D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8684489B2 (en) * 2008-10-08 2014-04-01 Xerox Corporation System and method for facilitating cutting of media having a phase change ink image
US7857442B2 (en) * 2008-10-20 2010-12-28 Xerox Corporation Heated folding system for a phase change ink imaging device
US8827439B2 (en) 2012-08-20 2014-09-09 Xerox Corporation Self-cleaning media perforator

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1958737A1 (de) * 1969-11-22 1971-05-27 Karl Dr Med Marx Verbindung fuer Nass- oder Trockenfilze von Papiermaschinen
US3664907A (en) * 1970-02-02 1972-05-23 Huyck Corp Industrial conveyor belts
US4186780A (en) * 1978-12-15 1980-02-05 Albany International Corp. Seam construction for multi-layer felts
US4484459A (en) * 1983-09-28 1984-11-27 Knytex Proform Biased multi-layer structural fabric composites stitched in a vertical direction and process and apparatus for making same
EP0747529A3 (fr) * 1995-06-06 1998-05-13 Appleton Mills Feutre pour papeterie et son procédé de fabrication, substrat, et procédé de fabrication de papier
US5731063A (en) * 1995-06-06 1998-03-24 Appleton Mills Papermaking felt and substrate
US6328922B1 (en) * 1999-10-28 2001-12-11 Xerox Corporation Process for post treatment of a flexible imaging member belt
US7005043B2 (en) * 2002-12-31 2006-02-28 Albany International Corp. Method of fabrication of a dryer fabric and a dryer fabric with backside venting for improved sheet stability
DE60309148T2 (de) * 2003-06-27 2007-09-06 W.L. Gore & Associates Gmbh Schweissnaht geringer Ausdehnung

Also Published As

Publication number Publication date
EP1672119A1 (fr) 2006-06-21
US20060180273A1 (en) 2006-08-17
DE502005001618D1 (de) 2007-11-15
ATE374859T1 (de) 2007-10-15

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