EP2182110A1 - Procédé de production d'un attelage de machine à papier - Google Patents

Procédé de production d'un attelage de machine à papier Download PDF

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Publication number
EP2182110A1
EP2182110A1 EP08168148A EP08168148A EP2182110A1 EP 2182110 A1 EP2182110 A1 EP 2182110A1 EP 08168148 A EP08168148 A EP 08168148A EP 08168148 A EP08168148 A EP 08168148A EP 2182110 A1 EP2182110 A1 EP 2182110A1
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EP
European Patent Office
Prior art keywords
basic structure
threads
surface basic
phase
deformable
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Withdrawn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
EP08168148A
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German (de)
English (en)
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
Priority to EP08168148A priority Critical patent/EP2182110A1/fr
Publication of EP2182110A1 publication Critical patent/EP2182110A1/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Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a method for producing paper machine clothing with a high surface quality, in particular a screen belt, in detail with the features of the preamble of claim 1; and a papermachine fabric made by the method.
  • Paper machine clothing in the form of endless belts, in particular wire or felt belts, for the production of fibrous webs, tissue or other products, the requirements for the properties of the surfaces of the resulting fibrous web are very high, in particular the uniformity. Errors in the form of marks present in the fibrous web pattern are to be avoided.
  • Paper machine clothing, in particular forming belts, felt belts and dryer fabrics are generally woven in flat form and designed as endless belts. During the weaving process, warp threads, generally monofilaments, are usually crossed with weft threads or so-called filling threads, which generally consist of polymeric monofilaments. Bindings are created according to the type of interweaving and crossover.
  • the warp threads are arranged in the installed state viewed in the machine direction, while the weft threads extend transversely thereto.
  • the result is a not completely flat surface, caused by the warp or the course of the weft threads.
  • the resulting not completely flat support causes marks in the resulting fibrous web.
  • the tape is subjected to a surface treatment after the weaving process. This is done under pressure and heat, in addition also using a tensile stress, to smooth wrinkles or elevations that cause the weft threads and to harden and stretch the surface of the fabric so that the amount of markings causing irregularities in the fabric is minimized ,
  • a method is known in which, after interweaving and bonding the filaments to papermachine sheet bases, they are subjected to a surface smoothing process wherein the fibrous web contacting surface of the endless belt is heated between two surfaces simultaneously with a contact pressure is applied to the tape.
  • the contact surfaces can be designed as resting surfaces, for example in the form of flat surfaces formed by plates, or to additionally contribute a tensile component for the surface treatment, as rotating curved surfaces.
  • the surface basic structure is guided through a gap, which is formed by two rotating rollers, in particular Yankee cylinder. After passing through the gap, the sheet is cooled.
  • the different versions of the paper machine clothing require specific molding methods, which differ further in terms of temperature, load, residence time in the gap in order to achieve optimum surface smoothness.
  • the publication WO 2004/061204 A1 discloses a method for producing an industrial process material that is calendered to increase surface smoothness.
  • the textile surface base structure is simultaneously exposed to a pressure and elevated temperature in a device provided for this purpose.
  • the device comprises a smoothing arrangement, in particular two rotating smoothing rolls, which form a gap between which the planar base is passed.
  • at least some of the fibers, threads, etc., or linear structures that make up the textile surface structure are deformed.
  • a traction component is additionally applied to the individual fibers in the base sheet, in particular in the longitudinal direction, and the smoothing process is further effected by the simultaneous application of pressure and heat.
  • smoother surfaces with a smaller thickness and a greater density can be produced.
  • the smoothing effect on the surface depends on the process parameters as well as the surface basic fabric to be processed and the structure of the individual threads, in particular material and dimensioning. It is therefore not always possible to achieve the required smoothness of the surface.
  • the invention is therefore based on the object, a method for producing a papermaking fabric, in particular a screen belt, further develop such that this can be provided on the one hand with even lower thickness and still very high tensile strength and high surface smoothness.
  • a method for producing paper machine clothing with a smooth surface or high surface quality, in particular screen belts from a textile base structure, which is produced by linear structures, in particular threads under the action of pressure and heat, according to the invention characterized in that for the production of the textile planar base at least In part, preferably a plurality of deformable threads or linear structures are used with this property.
  • the deformable threads allow them to be specifically shaped and embedded in the fabric during calendering so that a flat surface is produced and, moreover, the deformation process itself can be carried out much more easily.
  • the deformable threads may be monofilaments, multifilaments or threads or yarns.
  • Deformable means, for example, that the threads are composed of at least two components, which are characterized by different materials and / or different parameters, wherein one of the components retains the basic structure of the thread, while the other forms the deformable part.
  • the process parameters an at least two-phase line-shaped structure is present, wherein preferably the melting temperature of the individual phases is selected differently.
  • the selected deformation or also melting temperature can be selected such that, depending on the desired property in the textile fabric, a plastic deformation of one phase takes place, the other phase maintaining the basic structure of the yarn.
  • the melting temperature of the second phase is smaller than that of the first phase.
  • a surface base is formed from deformable filaments having a melting temperature of about 90 ° C to 260 ° C, preferably 120 ° C to 220 ° C, most preferably 160 ° C to 220 ° C in the second phase. The material of the second phase is melted and allows under the additional action of tension and pressure, a flow within the fabric structure, with a smooth and above all dense surface structure of this is formed.
  • Deformable may also mean that the material from which the deformable threads are constructed is originally softer and hardens chemically and / or thermally after exposure to temperature, i. harder compared to the original state.
  • the temperature effect may include, for example, a hot calendering.
  • the material in chemical curing, can crosslink.
  • the deformable threads are for this purpose at least a first component which preferably contains at least one single polymer of a polyester, a copolymer of a polyester, a single polymer of a polyamide, a copolymer of a polyamide and a second component which preferably contains at least one polyolefin, polyamide or fluoropolymer.
  • the selectable compositions are between 51-99 wt% of the first component and 49-1 wt% of the second component. Additives, for example in the form of compounding agents, antioxidants, hydrolysis stabilizers are also possible.
  • the deformation takes place under the action of pressure by guiding between two contact surfaces, via which a pressure is applied to at least one of the surfaces of the textile fabric.
  • the contact surfaces can be stationary surfaces. These can be flat or curved. Preferably, however, rotating contact surfaces are used which form a gap through which the textile fabric is passed.
  • the deformation region is also exposed to heat during the application of pressure.
  • the heat can be introduced either only at one contact surface or both.
  • the different treatments of the upper and lower surface of a textile fabric are also possible, so that here also different properties can be achieved due to the different deformations.
  • the adjustment of the process parameters in the corresponding treatment gap through which the textile fabric passes can influence the smoothness of the surface and / or the thickness and / or permeability of the fabric, and also the density.
  • the smoothness and / or thickness and / or permeability of the smoothed base sheet is controllable as a function of at least one of the following process parameters: pressure, temperature, tensile force, a size at least indirectly characterizing the rotational speed of the drive cylinder, base thickness of the base sheet, feed rate, nip geometry or a combination of the aforementioned sizes.
  • the setting of the individual process parameters can be done individually, depending on each other or coordinated with each other.
  • the concrete selection is at the discretion of the person skilled in the art for achieving certain properties at least on one side of the textile fabric.
  • the pressure in the gap can be maintained while the height of the gap is changed, on the other hand, it is conceivable to change the pressure, but to maintain the size of the machining gap.
  • the textile fabric is preferably designed as a fabric which later in the machine direction has functional threads in the machine direction or transverse to this running threads that experience a bond with each other. This can be done by guiding the crossover as a warp and weft threads. Conceivable, however, are also designs as a clutch.
  • the solution according to the invention is preferably used for the production of paper machine clothing, in particular forming belts in the form of screen belts.
  • FIG. 1 The surface basic structure 1 consists of threads 3, which are aligned in the machine direction MD and / or transversely to the machine direction CD when using the fabric and by appropriate guidance create a bond.
  • the surface basic structure 1 as a fabric 4 is made of intersecting and over and under each other guided warp threads 5 and weft threads 6, as it is present before a subsequent treatment, in particular surface smoothing. It can be seen that the surface 16.1 of the surface basic structure 1 at the upper side 18 and the lower side 19 deviates from an idealized plane due to the warp.
  • At least one part, preferably at least the threads 3 of one direction, for example the warp threads 5 or weft threads 6 or else both are designed according to the invention as deformable threads 7.
  • Deformable means that at least components of the threads 7 begin to tile under the action of a temperature and / or pressure and can be plastically deformed, so that by the deformation in a surface finish of the surface base 1 by embedding in the cavities between the individual threads level surface 16.15 for supporting a fibrous web or fiber suspension on the smoothed surface basic structure, which is then referred to as sheet 15 is generated.
  • deformable threads 7 there are a variety of ways. These can be configured as monofilament 8 or multifilament.
  • the deformability can be influenced in particular by the composition and dimensioning.
  • the deformable threads 7 preferably consist of a polymer or of a polymeric composition which is biphasic, at least with regard to deformation properties, in particular with regard to the softening or melting temperatures of the individual phases. This ensures that, on the one hand, a basic orientation is maintained, but the deformable part is used for approaching a flat surface on the upper side 18 and / or the lower side 19.
  • the deformable threads 7 formed of a polymer having a melting temperature of about 90 ° C to 260 ° C, preferably 120 ° C to 220 ° C, most preferably 160 ° C to 220 ° C in the second phase.
  • the threads 7 are preferably made of at least two components, a first component containing at least a single polymer of a polyester, a copolymer of a polyester, a single polymer of a polyamide, a copolymer of a polyamide and a second component containing at least one polyolefin, polyamide or fluoropolymer contains.
  • the composition may contain 51-99% by weight of the first component and 49-1% by weight of the second component.
  • Component 1 PET 98% by weight
  • Component 2 PE 2% by weight
  • Component 1 PET 87.3% by weight
  • Component 2 PE 5% by weight
  • the surface basic structure 2 with the deformable threads 7 is then calendered in a surface treatment method according to the invention, ie exposed to pressure and heat at the same time.
  • a surface treatment method ie exposed to pressure and heat at the same time.
  • This is done in the simplest case in a calender 9, comprising two rotatably mounted Yankee 10, 11, each having a curved rotating contact surface 12, 13 to form a gap 14.
  • At least one of the Yankee cylinders 10, 11 is heatable, so that the area of the planar base 1 passing through the gap 14 is heated and the deformable threads 7 are partially deformed to form a smooth surface on the sheet 15 and embedded in the free spaces for leveling de surfaces.
  • the calendering process is carried out under the action of pressure, i. the two contact surfaces 12, 13, which are formed by the outer periphery of the rotating rollers 10, 11 exert a force F on the surfaces 16.1 on the top and / or bottom 18, 19 of the planar base 1 from. Further, at least one of the rollers 10 or 11 is heated, so that there is a heated contact surface 12, 13, in the illustrated case, the roller 10. About an adjusting device 17, the temperature can be influenced. Furthermore, the straightening result can be influenced, in particular, by the tensile force which is impressed on the surface basic structure 1 by the driven roller 11.
  • the smoothness of the surface 16.15 of the smoothed surface basic structure 15 which is present after exiting the gap 14 with a thickness d15 can be adjusted.
  • the smoothness and / or thickness d15 and / or permeability of the smoothed surface base 15 is controllable as a function of at least one of the following process parameters: pressure, temperature, tensile force, a size at least indirectly characterizing the rotational speed of the drive roll, base thickness of the base sheet, feed rate, nip geometry or a combination of the aforementioned sizes.
  • FIG. 2 illustrates a possibility of smoothing surfaces. It would also be conceivable to select the composition of the threads 7 in such a way that the deformation required to achieve at least one smooth surface which serves to support the fibrous web or fiber suspension is produced only by tensile forces due to stretching and heating.

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  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
EP08168148A 2008-11-03 2008-11-03 Procédé de production d'un attelage de machine à papier Withdrawn EP2182110A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08168148A EP2182110A1 (fr) 2008-11-03 2008-11-03 Procédé de production d'un attelage de machine à papier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08168148A EP2182110A1 (fr) 2008-11-03 2008-11-03 Procédé de production d'un attelage de machine à papier

Publications (1)

Publication Number Publication Date
EP2182110A1 true EP2182110A1 (fr) 2010-05-05

Family

ID=40525653

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08168148A Withdrawn EP2182110A1 (fr) 2008-11-03 2008-11-03 Procédé de production d'un attelage de machine à papier

Country Status (1)

Country Link
EP (1) EP2182110A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001431A1 (fr) 1995-06-28 1997-01-16 Huyck Licensco, Inc. Processus de production d'un tissu destine a la fabrication du papier
WO1998012370A1 (fr) * 1996-09-17 1998-03-26 Albany International Corp. Habillages pour machines a papier, constitues de fibres bicomposees reliees entre elles
WO2004061204A1 (fr) 2002-12-30 2004-07-22 Albany International Corp. Toile industrielle calandree
WO2005111302A1 (fr) * 2004-05-19 2005-11-24 Wangner Gmbh & Co. Kg Procede permettant de former un tamis pour la partie humide d'une machine a papier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001431A1 (fr) 1995-06-28 1997-01-16 Huyck Licensco, Inc. Processus de production d'un tissu destine a la fabrication du papier
WO1998012370A1 (fr) * 1996-09-17 1998-03-26 Albany International Corp. Habillages pour machines a papier, constitues de fibres bicomposees reliees entre elles
WO2004061204A1 (fr) 2002-12-30 2004-07-22 Albany International Corp. Toile industrielle calandree
WO2005111302A1 (fr) * 2004-05-19 2005-11-24 Wangner Gmbh & Co. Kg Procede permettant de former un tamis pour la partie humide d'une machine a papier

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