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EP3191643B1 - Toile et méthode pour sa production - Google Patents

Toile et méthode pour sa production Download PDF

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Publication number
EP3191643B1
EP3191643B1 EP15754179.8A EP15754179A EP3191643B1 EP 3191643 B1 EP3191643 B1 EP 3191643B1 EP 15754179 A EP15754179 A EP 15754179A EP 3191643 B1 EP3191643 B1 EP 3191643B1
Authority
EP
European Patent Office
Prior art keywords
section
polymer film
perforations
overlap region
sections
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
EP15754179.8A
Other languages
German (de)
English (en)
Other versions
EP3191643A1 (fr
Inventor
Michael Straub
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 EP3191643A1 publication Critical patent/EP3191643A1/fr
Application granted granted Critical
Publication of EP3191643B1 publication Critical patent/EP3191643B1/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
    • D21F1/0063—Perforated sheets
    • 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

Definitions

  • the invention relates to a covering which is suitable for a machine for producing and / or finishing a material web, in particular a fibrous web, such as paper, board or tissue web, and which comprises at least one polymer film comprising an upper side and an underside.
  • a material web in particular a fibrous web, such as paper, board or tissue web, and which comprises at least one polymer film comprising an upper side and an underside.
  • the invention further relates to a method for producing such a fabric.
  • US 4,541,895 A discloses a papermachine fabric comprising a plurality of polymer films stacked and bonded together by ultrasonic welding.
  • the polymer films have perforations which are produced either before or after the bonding of the polymer films by laser drilling.
  • the fabric according to the invention is characterized in that the sections of the at least one polymer film which are arranged on one another in a planar manner are connected to one another by a welded connection, at least on the walls delimiting the perforations.
  • the portions at the walls bounding the perforations are welded together. Since a polymer film for use in a machine producing and / or processing a fibrous web has in the range of 100 to 4000 perforations per cm 2 or more, depending on the shape and / or size of the perforations, and at least some of these perforations according to the invention provide a welded joint between the polymer film sections arranged one above the other, this significantly improves the connection. In some cases, even completely dispensing with an additional laminar laminate connection of the film sections. It is therefore conceivable in this context that per cm 2 between 100 and 4000 welded joints are created.
  • the open area created by the perforations may range from 10% to 50%, preferably from 20% to 40%, more preferably from 25% to 35%.
  • the sections of the at least one polymer film are first arranged on one another such that the underside of a first section of one of the at least one polymer film and the top of a second section thereof or another of the at least one polymer film form an overlap region. Subsequently, energy is then applied to the overlap area in such a way that one or more perforations with one of these delimit by the action of the energy Wall is generated or become and the sections are welded together at least on the walls bounding the perforations.
  • the method according to the invention not only improves the connection between the polymer film sections, as described above, but also significantly simplifies the production of such clothing and therefore more cost-effectively, since the perforations in the at least one polymer film and the connection of the two polymer film sections take place in one process step.
  • a welded connection is produced on the walls delimiting the perforations when the energy for generating the perforation is applied.
  • polymer film is intended to mean a monolithic film having a large extension of length and width compared to its height (the length is at least 300 times greater than the height and the width is at least 100 times greater than the height) formed of a material having as its essential ingredient (at least 80% by weight) a polymer material.
  • the polymer film can be made by extrusion, casting or blow molding, with extrusion production being the most widely used.
  • the thickness of the at least one polymer film is preferably selected from the range from 300 to 1600 .mu.m, more preferably from the range from 500 to 1300 .mu.m, most preferably from 500 to 800 .mu.m.
  • the polymer material of the at least one polymer film may in particular contain or be formed from PET, PA, PPS PE alone or in combination.
  • the at least one polymer film may have in the overlap region in the range of 100 to 4,000 perforations per cm 2 . This not only sufficient permeability of the fabric in the overlapping area but also provided a sufficient connection of the sections in the overlapping area.
  • At least some, in particular all, of the perforations preferably run annularly around the respective wall.
  • the at least one polymer film also has perforations outside the overlapping area.
  • the number of perforations per cm 2 in the overlapping area and outside the overlapping area is substantially the same or even the same.
  • a deviation of not more than 20%, preferably not more than 10%, should be understood.
  • the perforations preferably each have a cross-sectional area in the range of 0.0019 mm 2 to 0.072 mm 2 , in particular in the range of 0.005 mm 2 to 0.0314 mm 2 .
  • the energy acting on the at least one polymer film may preferably be radiation energy, in particular laser radiation energy.
  • the wavelength or the wavelength range of the applied radiation energy is preferably in the range 500-13,000 nm, in particular 10,000-12,000 nm.
  • a typical radiation source for producing such a wavelength or such a wavelength range is a CO 2 laser.
  • a CO 2 laser has, for example, a working wavelength of 10,600 nm.
  • the two sections are pressed against each other at the moment of action of the energy.
  • the acting energy is radiant energy, so This can be done, for example, in a nip, wherein the one of the nip-forming elements, which is arranged on the side facing the radiation source, is preferably transparent to the radiation.
  • an absorber material is arranged, which absorbs the applied energy.
  • the absorber material can contain, for example, carbon black, carbon nanotubes or dyes absorbing in the abovementioned wavelength range.
  • Such an Arbsorbermaterial can be introduced, for example, in the form of a coating between the two sections or incorporated into the material of the polymer film section, which is arranged on the side facing away from the radiation source.
  • the covering comprises a plurality of polymer films, the first section being provided by a first polymer film and the second section by a second polymer film.
  • the covering comprises a plurality of polymer films which have the same width as the clothing and / or a plurality of polymer films which have a smaller width than the clothing.
  • the course of the top and bottom of the at least one polymer film in the overlapping region may be different.
  • the upper and lower sides of the at least one polymer film extend parallel to one another at least in the overlapping region of the two sections.
  • the overlapping area composed of the plural polymer film portions has a greater thickness than each of the polymer film portions.
  • the at least one polymer film has a smaller width than the clothing and two longitudinal edge end sections bounding the polymer film in their width, wherein the first portion is formed by the one and the second portion by the other longitudinal edge end portion of the polymer film, and wherein the polymer film is spirally wound to form the overlapping portion of the first and second portion and the two portions are interconnected in the overlapping region.
  • the first and second portions are provided by the same polymer film.
  • one and another polymer film each have a smaller width than the fabric.
  • Each of the polymer sheets has two longitudinal edge end portions defining the width thereof, wherein each of the polymer sheets has one longitudinal edge end portion forming the first portion and the other longitudinal edge end portion forming the second portion, and wherein the one and the other polymer films are each made endless and further the first portion of the first a polymer film and the second portion of the other polymer film are combined to form the overlapping area and bonded together.
  • the overlap region is formed along the longitudinal edge end sections, then this preferably extends over at least 25% of the width of the respective polymer film.
  • the upper and lower sides of the first section and / or the upper and lower sides of the second section extend obliquely and / or stepped relative to one another at least in the overlapping area in a plane defined by the longitudinal and thickness direction of the at least one polymer film , wherein the underside of the first portion and the top of the second portion are formed complementary to each other in this plane.
  • the overlapping area composed of the plural polymer film portions has the same thickness as the overlapping area forming polymer film sections.
  • a concrete application of this embodiment may be, for example, when the polymer film has two transverse edge end sections bounding the polymer film in its length, the first section passing through the one and the second section through the other Transverse end portion is formed and wherein the polymer film is made endless by the two transverse edge end portions are brought together to form the overlap region and connected together.
  • the polymer film forms an endless belt, wherein the overlapping region formed during the continuous operation has the same thickness as the polymer film outside the first and second sections.
  • the first and second sections are provided by the same polymer film.
  • first and second sections are additionally joined to the contact surface between the upper side of the second section and lower side of the first section, for example by gluing and / or fusing, are connected to each other flat.
  • the FIG. 1 shows a first embodiment of a fabric according to the invention 1 in sections in a view through the machine direction MD and the thickness direction D of the fabric 1 extending cutting plane.
  • the first polymer film 3 has an upper side 5 and a lower side 6 arranged parallel thereto.
  • the second polymer film 4 has an upper side 7 and a lower side 8 arranged parallel thereto.
  • the FIG. 1 1 shows a perforation 2, which in an overlap region 100 of a first portion 101 (with a hatching running from bottom left to top right) of the first polymer film 3 and a second portion 102 (with a hatching running from bottom right to top left) of the second Polymer film 4 is formed.
  • the two sections 101, 102 are arranged flat on one another, the underside 6 of the first section 101 of the first polymer film 3 and the upper side 7 of the second section 102 of the second polymer film 4 being connected to one another.
  • the perforation 2 has a bounding wall 9 which extends from the upper side 5 of the first section 101 of the first polymer film 5 to the lower side 8 of the second section 102 of the second polymer film 4.
  • the two sections 101, 102 are connected to one another, at least on the wall 9 delimiting the perforation 2, by a welded connection 10 that runs annularly in the wall, which is illustrated here as a dotted area.
  • the FIG. 2 shows a second embodiment of a fabric according to the invention 1 in sections in a view through the machine direction MD and the thickness direction D of the fabric 1 extending cutting plane.
  • the fabric 1 comprises in the present case a polymer film 3.
  • the polymer film 3 has two the polymeric film 3 defines transverse edge end portions defining its length, the first transverse edge end portion forming the first portion 101 (having hatching from bottom right to top left) and the second transverse edge end portion forming second portion 102 (having hatching running from bottom left to top right) , As from the representation of FIG. 2 it can be seen, the two sections 101, 102 are brought together to form an overlap region 100 and connected to each other. In the overlapping area 100 perforations 2 are formed.
  • the polymer film 3 has an upper side 5 and a lower side 6. It can be seen that in the overlapping region 100 viewed in the plane defined by the machine direction MD and the thickness direction D of the polymer film 3, the upper side 5 and the lower side 6 of the first section 101 are inclined relative to one another , Furthermore, it can be seen that the upper side 7 and the lower side 8 of the second section 102 are inclined relative to one another.
  • the two sections 101, 102 are formed in the plane shown complementary to each other.
  • the two sections 101, 102 are connected to each other at least at the walls bounding the perforations 2 9 by a welded in the respective wall 9 annular weld joint 10, which are presently shown as dotted areas.
  • the covering 1 comprises a plurality of first polymer films 3a to 3d as well as a plurality of second polymer films 4a to 4c, all of which have a smaller width, ie a smaller extent in the cross-machine direction CD, than the clothing 1.
  • the first polymer films 3a-3d are in Machine transverse direction CD side by side, forming a first layer, arranged.
  • the second polymer foils 4a-4c are arranged next to one another in the cross-machine direction CD, forming a second layer, wherein the two layers are arranged flat on one another.
  • the top view of FIG. 3a looks at the first polymer films 3a-3d.
  • first and second polymer films 3a-3d, 4a-4c are offset in the cross-machine direction CD and provide a plurality of first and second portions 101a to 101f and 102a to 102f each forming an overlap area.
  • the first polymer film 3a provides the first portion 101a which forms the overlapping area 100a with the second portion 102a of the second polymer film 4a.
  • the first polymer film 3b provides the first portion 101b which forms the overlap region 100b with the second portion 102b of the second polymer film 4a. This principle continues with respect to the arrangement of the other sections.
  • the FIG. 4 shows an embodiment of the inventive method for producing, for example, the fabric 1 as this example.
  • the method comprises the following steps: There is provided a first and a second polymer film 3, 4 in the form of a roll.
  • the first polymer film 3 has an upper side 5 and a lower side 6 arranged parallel thereto.
  • the second polymer film 4 has an upper side 7 and a lower side 8 arranged parallel thereto.
  • the two polymer films 3, 4 are brought together and deposited in such a way that at least a first section of the first polymer film 3 and a second section of the second polymer film 4 form an overlap region, in which the bottom 6 of the first polymer film 3 and the top 7 of the second polymer film 4 are stored flat on each other.

Landscapes

  • Laminated Bodies (AREA)

Claims (14)

  1. Toile (1) convenant pour une machine de fabrication et/ou de finition d'une nappe de matière, en particulier d'une nappe de fibres, par exemple une nappe de papier, de carton ou de papier mouchoir,
    présentant au moins un film polymère (3, 3a-3d, 4, 4a-4c) qui comporte une face supérieure (5, 7) et une face inférieure (6, 8),
    la face inférieure d'une première section (101, 101a-101f) du ou des films polymères et la face supérieure d'une deuxième section (102, 102a-102f) du même film polymère ou d'un autre des deux ou plusieurs films polymères étant disposés à plat les unes au-dessus des autres et au moins certaines parties en étant mutuellement reliées dans une zone de superposition (100, 100a-100f),
    des perforations (2) délimitées par des parois (9) et qui traversent les deux sections disposées l'une au-dessus de l'autre depuis la face supérieure de la première section jusqu'à la face inférieure de la deuxième section étant formées dans la zone de superposition,
    les perforations étant formées par de l'énergie agissant sur le ou les films polymères,
    les sections étant reliées mutuellement par une liaison soudée (10) au moins sur les parois qui délimitent les perforations et un matériau absorbant qui absorbe l'énergie agissant en vue de la formation des perforations étant disposé dans la zone de superposition de telle sorte que la liaison soudée soit obtenue pendant l'action de l'énergie appliquée en vue de la formation de la perforation qui lui est associée.
  2. Toile selon la revendication 1, caractérisée en ce que plusieurs films polymères sont prévus, la première section étant constituée d'un premier film polymère et la deuxième section d'un deuxième film polymère.
  3. Toile selon la revendication 2, caractérisée en ce que la face supérieure et la face inférieure de chaque film polymère s'étendent parallèlement l'une à l'autre au moins dans la zone de superposition formée par les deux sections.
  4. Toile selon les revendications 2 ou 3, caractérisée en ce que la zone de superposition s'étend sur au moins 25 % de la longueur et de la largeur du premier et du deuxième film polymère.
  5. Toile selon la revendication 1, caractérisée en ce que la première et la deuxième section sont constituées du même film polymère.
  6. Toile selon la revendication 5, caractérisée en ce que le film polymère possède deux sections d'extrémité de bord transversal qui délimitent le film polymère dans sa longueur, la première section étant formée par l'une des sections d'extrémité de bord transversal et la deuxième section par l'autre section d'extrémité de bord transversal, la feuille polymère étant réalisée sans fin par le fait que les deux sections d'extrémité de bord transversal sont jointes l'une à l'autre en formant la zone de superposition.
  7. Toile selon l'une des revendications précédentes, caractérisée en ce que la face supérieure et la face inférieure de la première section et/ou la face supérieure et la face inférieure de la deuxième section s'étendent obliquement et/ou en gradins dans un plan sous-tendu par la direction longitudinale et la direction de l'épaisseur du ou des films polymères, la face inférieure de la première section et la face supérieure de la deuxième section s'étendant de manière mutuellement complémentaire dans ce plan.
  8. Toile selon les revendications 1, 5 ou 6, caractérisée en ce que le ou les films polymères présentent une largeur plus petite que celle de la toile et deux sections d'extrémité de bord longitudinal qui délimitent le film polymère en largeur, la première section étant formée par l'une des sections d'extrémité de bord longitudinal et la deuxième section par l'autre section d'extrémité de bord longitudinal, la première section et la deuxième section du ou des films polymères ou la première section de l'autre ou des autres films polymères et la deuxième section d'un autre ou d'autres films polymères étant jointes et reliées l'une à l'autre pour réaliser la toile en largeur.
  9. Toile selon l'une des revendications précédentes, caractérisée en ce que le ou les films polymères présentent également des perforations à l'extérieur de la zone de superposition.
  10. Toile selon l'une des revendications précédentes, caractérisée en ce que dans la zone de superposition, la première et la deuxième section sont encore reliées à plat l'une à l'autre sur la surface de contact entre la face supérieure de la deuxième section et la face inférieure de la première section, par exemple par collage et/ou fusion.
  11. Toile selon l'une des revendications précédentes, caractérisée en ce que le ou les films polymères présentent de 100 à 4 000 perforations par cm2 dans la zone de superposition.
  12. Toile selon l'une des revendications précédentes, caractérisée en ce que chaque perforation présente une section transversale dont la superficie est comprise dans la plage de 0,0019 mm2 à 0,072 mm2 et en particulier dans la plage de 0,005 mm2 à 0,0314 mm2.
  13. Procédé de fabrication d'une toile (1) qui convient pour une machine de fabrication et/ou de finition d'une nappe de matière, en particulier d'une nappe de fibres, par exemple une nappe de papier, de carton ou de papier mouchoir, le procédé comportant les étapes suivantes :
    a. préparation d'au moins un film polymère (3, 3a-3d, 4, 4a-4c) qui comporte une face supérieure (5, 7) et une face inférieure (6, 8),
    b. formation d'une zone de superposition (100, 100a-100f) en disposant à plat l'une au-dessus de l'autre la face inférieure d'une première section (101, 101a-101f) du ou des films polymères et la face supérieure d'une deuxième section (102, 102a-102f) du même film polymère ou d'un autre des deux ou plusieurs films polymères, un matériau absorbant qui absorbe l'énergie étant disposé dans la zone de superposition,
    c. action d'une énergie absorbée par le matériau absorbant sur le ou les films polymères dans la zone de superposition de telle sorte que cette action forme une ou plusieurs perforations (2) avec une paroi (9) qui la délimite et que dans la même étape de traitement, les sections soient soudées l'une à l'autre au moins sur la paroi qui délimite les perforations.
  14. Procédé selon la revendication 13, caractérisé en ce que l'énergie agissant est une énergie radiante, en particulier l'énergie d'un faisceau laser, la longueur d'onde de l'énergie radiante en action étant en particulier située dans la plage de 500 à 12 000 nm et de préférence dans la plage de 10 000 à 11 000 nm.
EP15754179.8A 2014-09-10 2015-08-20 Toile et méthode pour sa production Not-in-force EP3191643B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014218074 2014-09-10
PCT/EP2015/069135 WO2016037825A1 (fr) 2014-09-10 2015-08-20 Tenture

Publications (2)

Publication Number Publication Date
EP3191643A1 EP3191643A1 (fr) 2017-07-19
EP3191643B1 true EP3191643B1 (fr) 2018-11-07

Family

ID=54007692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15754179.8A Not-in-force EP3191643B1 (fr) 2014-09-10 2015-08-20 Toile et méthode pour sa production

Country Status (2)

Country Link
EP (1) EP3191643B1 (fr)
WO (1) WO2016037825A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018105433A1 (de) * 2018-03-09 2019-09-12 Voith Patent Gmbh Verfahren zur Herstellung einer Grundstruktur für eine Papiermaschinenbespannung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541895A (en) * 1982-10-29 1985-09-17 Scapa Inc. Papermakers fabric of nonwoven layers in a laminated construction
GB0325463D0 (en) * 2003-10-31 2003-12-03 Voith Fabrics Patent Gmbh Three dimensional tomographic fabric assembly
DE102010063870A1 (de) * 2010-12-22 2012-06-28 Voith Patent Gmbh Verstreckte Endlosbespannung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2016037825A1 (fr) 2016-03-17
EP3191643A1 (fr) 2017-07-19

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