EP4110988A1 - Couverture de machine à papier - Google Patents

Couverture de machine à papier

Info

Publication number
EP4110988A1
EP4110988A1 EP21703439.6A EP21703439A EP4110988A1 EP 4110988 A1 EP4110988 A1 EP 4110988A1 EP 21703439 A EP21703439 A EP 21703439A EP 4110988 A1 EP4110988 A1 EP 4110988A1
Authority
EP
European Patent Office
Prior art keywords
covering
polymer elements
polymer
covering according
elements
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.)
Pending
Application number
EP21703439.6A
Other languages
German (de)
English (en)
Inventor
Isabel Prause
Robert EBERHARDT DR.
Hubert Walkenhaus
Torsten Wich
Cedric FITZER
Uwe Köckritz Dr.
Reinhard Holl
Thomas Hensler
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
Priority claimed from DE102020108511.7A external-priority patent/DE102020108511A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP4110988A1 publication Critical patent/EP4110988A1/fr
Pending legal-status Critical Current

Links

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
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • 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

Definitions

  • the invention relates to a covering for a machine for producing or processing a fibrous web according to the preamble of claim 1.
  • a large number of different coverings are used in the production of fibrous webs, in particular paper or tissue webs. These coverings can be used for transporting the train, but also for drainage and structuring.
  • press felts are usually used in which one or more fleece layers are applied to a woven or non-woven base structure.
  • WO 2014/166985 describes coverings on which patterns were produced by extrusion of polymer material. These patterns are used to structure the web, especially in the case of tissue webs.
  • WO 2017/139786 describes a covering in which an extruded net is applied to a base fabric on a base fabric. This covering should also serve to structure the web.
  • the object of the present invention is to propose alternative coverings and the associated production methods in order to enable a fibrous web to be structured.
  • a further aim of the present invention is to propose coverings with an improved or targeted dewatering effect.
  • Sentence 1 Covering for a machine for the production or processing of a fibrous web, in particular a paper or tissue web, wherein the
  • Covering comprises a base covering which is in contact with the web
  • Polymer elements that are welded onto the top By welding the polymer elements to the surface of the
  • Structuring elements are used that are suitable for a permanent and reliable operation of the covering.
  • such a welded connection can be implemented largely independently of the nature of the upper side of the covering. This is particularly relevant with regard to the extrusion process described in WO 2014/166985. While the extruded polymer elements adhere very well to many fabrics, an extrusion, for example, delivers
  • Nonwoven surfaces of felts do not have coverings that can be operated permanently in a machine for the production of a fibrous web.
  • Experiments by the applicant have shown that on the same substrate by means of welding, for example by means of NIR transmission welding, very strong and permanent joints can be achieved.
  • transmission welding especially NIR transmission welding
  • other welding methods can also be used, for example hot air welding or ultrasonic welding.
  • the possibility is also provided of combining the welding on of the polymer elements with other forms of connection.
  • the known extruded polymer elements are additionally welded to the surface.
  • this is advantageous for processing, since the polymer elements are already fixed in the correct position on the surface of the covering after extrusion and do not have to be held in their position during the subsequent welding process.
  • these polymer elements which are still pasty during extrusion, cling to a certain extent to the surface of the covering, so that an enlarged contact area is created between the surface of the covering and the polymer element, which leads to a stronger welded joint during subsequent welding.
  • Base covering for light in the NIR range between 780 [nm] and 1300 [nm] is completely or largely transparent.
  • the polymers usually used for coverings such as polyamides, but also polyesters meet these requirements.
  • Polymer elements for light of a wavelength in the NIR range between 780 [nm] and 1300 [nm] are wholly or largely absorbent. This can also be achieved, for example, by adding an additive to a polymer that is transparent per se, such as a polyamide or polyester. Carbon black is very suitable for this.
  • the polymer elements can also be covered with an absorbent layer, while the interior of the
  • Polymer element is largely transparent.
  • Sentence 4 Covering according to one of the previous sentences, wherein a medium is provided between the top of the base covering and the polymer elements, which for light of a wavelength in the NIR range between
  • Such a medium can be designed as a liquid medium - such as Clearweld TM -, as a powder, as a film, as a coating or as an absorbent adhesive.
  • the advantage of a covering in which - based on a wavelength range - the base covering is transparent and the polymer elements are absorbent, or in which only the contact area between the polymer element and the base covering is absorbent, is that the welded connection can be realized comparatively easily by means of transmission welding.
  • the covering is irradiated with light of the appropriate wavelength - for example with a laser - most of the covering remains cold, while only the small, absorbing part - e.g. the polymer elements or the
  • connection medium- heat up and melt.
  • the two media can be welded together. It can thus be ensured that essential properties of the basic covering - for example its strength properties - do not change or only change minimally as a result of the welding of the polymer elements.
  • a material can be selected for the polymer elements which has good compatibility with the polymer of the upper side of the covering. In particular, both materials can be identical or come from the same group - for example polyamides.
  • the basic covering has a load-bearing basic structure, in particular a basic fabric, or consists of it.
  • the covering can thus consist of a fabric onto which polymer elements are welded.
  • such a load-bearing basic structure can also comprise or consist of a scrim, a film or the like.
  • the basic covering, and thus also the entire covering, can be designed as an endless covering or as a seam covering.
  • an endless round fabric can be used.
  • a fabric can also be used which is made endless by means of a seam that is usually detachable.
  • the base covering having a fleece layer which provides the upper side of the base covering in contact with the web. Further fleece layers can also be provided. E.g. the
  • the underside of the covering can be provided by a fleece layer.
  • the fleece layer or fleece layers are usually connected to the load-bearing basic structure by needling.
  • Fleece properties such as permeability or compressibility and storage volume are avoided.
  • Sentence 7 Covering according to one of the previous sentences, wherein the base covering has a nonwoven layer which is in contact with the web
  • this fleece layer consists of fleece fibers with a fineness of less than 67 dtex, in particular less than 22 dtex. It is also advantageous if the nonwoven fibers have a fineness of more than 3 dtex, in particular 11 dtex or more.
  • the fleece layer can also contain special fibers such as hot-melt adhesive fibers.
  • Sentence 8 Covering according to one of the previous sentences, wherein at least some of the polymer elements are designed as thread-like polymer elements.
  • Sentence 9. Covering according to one of the previous sentences, wherein at least some of the polymer elements are designed as strip-shaped polymer elements, in particular with a width of less than 15 mm.
  • the thread-like or band-like polymer elements can be arranged, for example, in the machine direction (MD) or also in the cross-machine direction (CD). Alternatively, thread-like polymer elements can also be used in other directions, for example diagonally on the
  • Base covering be arranged.
  • Clause 10 Covering according to one of Clauses 8 or 9, the thread-like and / or band-like polymer elements being stretched uniaxially or biaxially.
  • the thread-like polymer elements can be designed as monofilaments or multifilaments, for example.
  • Suitable uniaxially stretched polymer tapes are, for example, those already used as the basis for adhesive tapes or packaging tapes. The fact that such tapes are in principle suitable for use in coverings is described, inter alia, in WO 2010/068765.
  • Advantageous materials for the thread-like polymer elements are polyamides, but also polyethylenes or polyurethanes.
  • polyurethanes thermoplastic polyurethanes (TPU) are particularly advantageous.
  • the polymer elements in particular all polymer elements, consist of a polyurethane, in particular a thermoplastic polyurethane, or comprise this, this can have the advantageous effect that the polymer elements are compressed by their elasticity in a treatment nip - which is, for example, an improved one
  • the thread-like polymer elements and / or band-like polymer elements are made of solid material and are therefore not hollow on the inside. Hollow threads can also be compressed well in the press nip, but with the high load of constant compression and Expansion in the nip runs the risk of these hollow threads becoming brittle and breaking. Therefore, the use of hollow threads ('hollow yarns') is in principle possible.
  • the use of polymer elements made of solid material is preferable. Any desired adjustment of the elasticity of the polymer elements should be preferred, as described above, via the choice of
  • Materials e.g. TPU
  • Clause 11 Covering according to one of Clauses 8 to 10, the thread-like and / or band-shaped polymer elements being arranged in the machine direction of the covering, or deviating from this machine direction by less than 15 °.
  • some or all of the found or band-shaped polymer elements can be arranged in a spiral on the endless or endless covering.
  • stretched polymer elements has the advantage that, in addition to the structuring effect, they also make a contribution to the strength of the covering.
  • the stretched polymer elements result in the
  • the structure of the polymer elements is not or not significantly impaired by the joining process, i.e. by welding the polymer elements onto the base covering, so that the tensile strength of the threads or tapes achieved by the stretching is maintained. Therefore, the transmission welding described above is very advantageous. This allows very strong welded joints to be created. The structural damage remains very low due to the merely local heating of the joining partners at the joint.
  • Sentence 12 Covering according to one of the previous sentences, wherein at least some, in particular all of the polymer elements consist of a material which has a hardness of 40 Shore D or more, in particular more than 50 Shore D.
  • polymer material of this hardness range provides a particularly good structuring effect.
  • most polyamides and polyethylenes are in this hardness range.
  • Sentence 13 Covering according to one of the previous sentences, especially the sentences
  • polymer elements have a circular cross section.
  • polymer elements for example as thread material
  • drawn, thread-like polymer elements with a circular cross-section can be very advantageous if both a structuring of the fibrous web and an increase in the strength of the covering are to be achieved.
  • Sentence 14 Covering according to one of the previous sentences, especially the sentences
  • oval cross-sections are conceivable.
  • other cross-sections in particular rectangular or square cross-sections, are also conceivable.
  • rectangular or square cross-sections are very advantageous for the polymer elements. Due to the straight edges of these structuring elements, the resulting structure in the sheet is very sharply defined and usually more clearly recognizable than with round or oval elements.
  • Sentence 15 Covering according to one of the previous sentences, the distance between two adjacent polymer elements being at least 1mm, preferably between 1.5mm and 10mm, particularly preferably between 2 and 5mm.
  • Structured coverings often have to meet several requirements at the same time, particularly in the manufacture of tissue paper. In addition to dewatering and structuring, they should, if possible, also protect the thickness or bulk of the tissue product.
  • the web is structured as described by the polymer elements in their function as structuring elements.
  • the increased pressing of the web at the points of the structuring elements also prevents drainage locally. This creates a targeted topographical and hydraulic marking in the track.
  • a suitable choice of the distances between the welded-on polymer elements can ensure that the bulk of the tissue web is not impaired too much, even if, for example, the tissue web is pressed onto the covering. It is therefore advantageous if a distance of more than 1 mm is maintained between two adjacent polymer elements, in particular between two adjacent thread-like polymer elements. Distances between 1.5mm and 10mm, particularly preferably between 2 and 5mm, are particularly advantageous. It is usually not troublesome if the polymer elements also have smaller spacings in a small part of the polymer elements or at individual points. Sentence 16. Covering according to one of the previous sentences, wherein the diameter of a polymer element, in particular a thread-like polymer element, is more than 100 pm, preferably between 200 pm and 500 pm. In the case of polymer elements with a non-circular cross-section, the diameter of the smallest circumference can be used as the diameter.
  • FIG. 1 shows a covering according to one aspect of the invention.
  • FIG. 2 shows a covering according to a further aspect of the invention
  • FIG. 3 shows an upper side of a covering according to a further aspect of the invention
  • FIG. 4 shows a section through a covering according to a further aspect of the invention
  • FIG. 1 shows a covering 1 for a machine for setting or processing a fibrous web, in particular a paper or tissue web.
  • the covering 1 comprises a base covering 2, which has an upper side 2a in contact with the web and an underside.
  • the base covering 2 here has a base structure 4, for example in the form of a base fabric 4, as well as a fleece layer 5.
  • the nonwoven layer 5 provides the paper-contacting top side 2a, while the basic structure 4 provides the bottom side.
  • a further fleece layer can also be provided below the basic structure, which then forms the underside of the covering 1.
  • the fleece layer 5 can be connected to the basic structure 4, for example, by needling.
  • a plurality of polymer elements 3, 3a, 3b are shown, which are welded onto the top side 2a.
  • different types of polymer elements 3, 3a, 3b are shown in order to indicate the various possibilities that are possible within the scope of the present invention.
  • only one or two types of polymer elements 3, 3a, 3b can be provided.
  • the polymer elements 3 and 3b are designed as thread-like or ribbon-like polymer elements. These polymer elements 3 oriented in the machine direction (MD) can be oriented in the transverse direction
  • Polymer elements 3a or also polymer elements oriented in other directions. 3, 3a can.
  • the thread-like or band-like polymer elements 3, 3a can be stretched polymer elements 3, 3a. In addition to structuring and dewatering the web, these can then also serve to increase the strength of the covering 1.
  • undrawn polymer elements 3, 3a, 3b can also be provided, which are applied, for example, directly by extrusion to the upper side 2a of the covering 1 or the nonwoven layer 5.
  • Polymer elements 3b is intended to show that the polymer elements 3, 3a, 3b can also be designed as purely decorative structuring elements, the purpose of which is almost exclusively to structure the fibrous web. Such polymer elements 3b can be designed, for example, in the form of figurative motifs, letters or company logos. These polymer elements 3b can then be extruded or printed onto the surface 2a, for example.
  • All polymer elements 3, 3a, 3b are also welded onto the top side 2a.
  • the base cover 2 consists of a basic structure 4 in the form of a fabric 4 on the top 4 are thread-like polymer elements 3 welded, which are stretched in their longitudinal direction.
  • the thread-like polymer elements 3 are arranged essentially in the machine direction (MD) of the covering 3.
  • the polymer elements 3 can also be arranged in a spiral.
  • the polymer elements 3 shown in FIG. 2 each represent the different turns of an individual polymer element 3.
  • These polymer elements 3 are advantageously distributed uniformly over the width of the covering 1 and also extend in the Essentially over their entire length.
  • Such stretched polymer elements 3 fulfill two different functions simultaneously in the covering. On the one hand, they serve to structure the fibrous web and support drainage.
  • the basic structure 4 is designed as a basic fabric 4. Since the drawn, thread-like polymer elements 3 already provide a large part of the tensile strength of the covering 1, thinner fabrics can be used in comparison to conventional covering 1.
  • non-woven base structures 4 can also be used in coverings 1 such as that in FIG.
  • basic structures 4 made of one or more polymer films can be used.
  • FIG. 3 shows an upper side 2a of a covering 1 such as that shown in FIG. 1, for example.
  • the upper side 2a in contact with the paper is provided by a fleece layer 5.
  • Polymer elements 3 are welded onto this fleece layer 5 by means of transmission welding.
  • the polymer elements 3 are drawn threads here; alternatively, however, they could also be undrawn, thread-like polymer elements 3, which are applied, for example, directly to the surface 2a by extrusion.
  • the fibers of the nonwoven layer 5 are made of a polymer which is completely or largely transparent to light in the near infrared range between 780 [nm] and 1300 [nm]. Polyamides have this property.
  • the polymer elements 3 are colored by adding an additive - here carbon black, whereby they absorb the corresponding light.
  • the polymer elements 3 can then optionally also consist of the same material as the fleece fibers, which enables a very strong welded connection.
  • the thread-like polymer elements 3 in FIG. 2 can be arranged largely as desired, for example in the machine direction (MD), in the transverse direction (CD) or diagonally. This opens up great degrees of freedom for structuring the Paper web.
  • the distance between two adjacent polymer elements 3 is advantageously at least 1mm, preferably between 1.5mm and 10mm, particularly preferably between 2 and 5mm.
  • the polymer elements 3 in FIG. 3 have spacings in the range between 1.5 mm and 1.8 mm.
  • FIG. 4 shows a section through the covering 1 from FIG. 3, only the fleece layer 5 without the underlying basic structure 4 being shown.
  • the polymer elements 3 here have a diameter of 300 ⁇ m. Such polymer elements 3 preferably have diameters between 200 pm and 500 pm.
  • the structure of the thread-like polymer elements is almost unchanged even after welding. As a result of the joining pressure during welding, they are pressed somewhat into the fleece layer 5, but the polymer elements 3 still protrude significantly beyond the surface 2a, so that they enable the paper, tissue or other fibrous web to be reliably structured.

Landscapes

  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Abstract

Couverture de machine de production ou de traitement d'un voile fibreux, en particulier un voile de papier ou de tissu, la couverture comprenant une couverture de base qui a un côté supérieur en contact avec le voile et un côté inférieur, et une pluralité d'éléments polymères, caractérisée en ce que les éléments polymères sont soudés sur le côté supérieur.
EP21703439.6A 2020-02-27 2021-02-04 Couverture de machine à papier Pending EP4110988A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US202062982393P 2020-02-27 2020-02-27
DE102020108511.7A DE102020108511A1 (de) 2020-03-27 2020-03-27 Papiermaschinenbespannung
PCT/EP2021/052629 WO2021170361A1 (fr) 2020-02-27 2021-02-04 Couverture de machine à papier

Publications (1)

Publication Number Publication Date
EP4110988A1 true EP4110988A1 (fr) 2023-01-04

Family

ID=74553829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21703439.6A Pending EP4110988A1 (fr) 2020-02-27 2021-02-04 Couverture de machine à papier

Country Status (4)

Country Link
US (1) US12077913B2 (fr)
EP (1) EP4110988A1 (fr)
CN (1) CN115176055A (fr)
WO (1) WO2021170361A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003040470A1 (fr) 2001-11-02 2003-05-15 Kimberly-Clark Worldwide, Inc. Tissu comprenant des elements non tisses a utiliser dans la fabrication de produit en papier presentant des zones a texture arriere visuellement discernable, bordees d'elements decoratifs curvilignes et procede de fabrication de ces produits en papier
US6787000B2 (en) * 2001-11-02 2004-09-07 Kimberly-Clark Worldwide, Inc. Fabric comprising nonwoven elements for use in the manufacture of tissue products having visually discernable background texture regions bordered by curvilinear decorative elements and method thereof
US6821385B2 (en) 2001-11-02 2004-11-23 Kimberly-Clark Worldwide, Inc. Method of manufacture of tissue products having visually discernable background texture regions bordered by curvilinear decorative elements using fabrics comprising nonwoven elements
CN106378970A (zh) 2008-12-12 2017-02-08 阿尔巴尼国际公司 包括螺旋缠绕材料条带的工业织物
DE102011005673A1 (de) * 2011-03-17 2012-09-20 Voith Patent Gmbh Laminiertes Endlosband
WO2014166985A1 (fr) 2013-04-10 2014-10-16 Voith Patent Gmbh Procédé de production d'un entoilage industriel et entoilage industriel
WO2017139786A1 (fr) 2016-02-11 2017-08-17 Structured I, Llc Courroie ou tissu comprenant une couche polymère pour machine à papier
DE102016206387A1 (de) * 2016-04-15 2017-10-19 Voith Patent Gmbh Verfahren und Formierband zur Herstellung einer Faserstoffbahn
US10815618B2 (en) 2016-10-27 2020-10-27 The Procter & Gamble Company Deflecting member for making fibrous structures

Also Published As

Publication number Publication date
US20230079374A1 (en) 2023-03-16
CN115176055A (zh) 2022-10-11
US12077913B2 (en) 2024-09-03
WO2021170361A1 (fr) 2021-09-02

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