EP2148002A1 - Bande sans fin pour le traitement de bandes de matériau formées de manière plane - Google Patents

Bande sans fin pour le traitement de bandes de matériau formées de manière plane Download PDF

Info

Publication number
EP2148002A1
EP2148002A1 EP09163215A EP09163215A EP2148002A1 EP 2148002 A1 EP2148002 A1 EP 2148002A1 EP 09163215 A EP09163215 A EP 09163215A EP 09163215 A EP09163215 A EP 09163215A EP 2148002 A1 EP2148002 A1 EP 2148002A1
Authority
EP
European Patent Office
Prior art keywords
endless belt
carbon nanotubes
matrix material
elastic
belt according
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.)
Granted
Application number
EP09163215A
Other languages
German (de)
English (en)
Other versions
EP2148002B1 (fr
Inventor
Rudolf Muench
Martin Dr. Staiger
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 EP2148002A1 publication Critical patent/EP2148002A1/fr
Application granted granted Critical
Publication of EP2148002B1 publication Critical patent/EP2148002B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention relates to an elastic endless belt for devices for processing sheet-formed material webs, which comes into contact with the material web to be processed, consisting at least partially of a matrix material, preferably of plastic and in particular polyurethane, are embedded in the nanoparticle.
  • the material to be produced or the material web to be processed is passed over a plurality of rollers of different design.
  • the smoothing of a paper web is usually achieved by pressurizing the paper web.
  • the paper web passes through a passsnip, which is formed by two mutually adjacent rollers. This arrangement is commonly referred to as a calender.
  • Such processing of the paper web is accordingly also referred to as calendering.
  • a first problem is due to the short residence time of the paper web in nip classic calender. This has the consequence that a larger number of firmwaresnips must be used to achieve the desired processing result. This requires a correspondingly large number of calender rolls, which are correspondingly expensive to buy. Even the provision of the roll shells with an elastic coating does not significantly reduce the necessary rolls for a high quality calendering, although the nip is widened a little.
  • One way to reduce the required number of nips is to increase the residence time of the web in a single nip more clearly. This is accomplished by so-called wide-nip calenders.
  • one of the calender rolls is provided with an elastic roll shell.
  • the corresponding roll surface is convexly deformed by the corresponding calender roll in the nip area, together with the roll shell, so that a nip with a greater processing length is formed.
  • a disadvantage of such wide-nip calenders is that there are some restrictions on the material selection with respect to the roll surface.
  • the elastic deformability of a calender roll sets the speed of the rollers certain limits.
  • a problem with calenders is the slack. With today's calender rolls lengths of up to 15 m in length and more, there is a considerable sag of the rolls. This sag can be problematic in terms of vibration. In addition, the slack causes uneven driving speed of the paper web to be calendered over the roll length. In particular, to address the latter problem, different ways of crowning have been proposed in the past.
  • a particularly promising approach to avoid the unavoidable sag of rolls consists in so-called bending compensation rolls.
  • a carrier element over its length is provided with pressure elements.
  • a hollow cylinder is guided, which contacts the paper web to be calendered and serves for this as a roll surface.
  • a problem with the calenders last described is to be able to dimension the strength of the endless belt sufficiently due to tensile and compressive loads or temperature influences. For this reason, the endless belts have been filled with fillers that increase strength and thermal conductivity. Nanoparticles have also been discussed here.
  • the matrix material in which the nanoparticles are embedded preferably consists of the plastic polyurethane, but other materials can also be used, for example latex or rubber.
  • Such elastic endless belts are for example from the WO 2005/090429 A1 known.
  • band calender as well as Breitnipkalander be found whose endless belts are made of polyurethane and contain nanoparticles.
  • fillers for example in the form of fibers or powder are introduced into the matrix material.
  • the thermal conductivity of the elastic endless belts can be improved by using fillers having a high thermal conductivity.
  • the nanoparticles are formed by carbon nanotubes.
  • Carbon nanotubes, or CNTs are microscopic tubular structures (molecular nanotubes) made of carbon. Their walls consist only of carbon, the carbon atoms occupying a honeycomb-like structure with hexagons and three bonding partners. This structure allows a good embedding in the matrix material, which is preferably polyurethane. Despite their ease, carbon nanotubes show significantly improved behavior within the matrix material in terms of strength and thermal conductivity.
  • the length of the carbon nanotubes is very long compared to the diameter.
  • the prior art describes particles in the order of 1 to 100 nm.
  • carbon nanotubes have a length in the millimeter range.
  • the carbon nanotubes correspond to fibers (like paper fibers in the paper). They are to be networked to absorb even better forces, so that the endless belt is durable.
  • carbon nanotubes are stronger than steel or carbon fibers. Therefore, it is advantageous if the carbon nanotubes embedded in the matrix material have a diameter range of 0.2 to 50 nm and a length of more than 1000 nm.
  • Carbon nanotubes of this size also have the advantage that the endless belt can be sanded very smooth, which is particularly beneficial for the processing of the material web.
  • the smoother the treatment band the better, for example, a calendered paper in its surface properties.
  • the number of requiredndelsnips can be reduced by the improved surface smoothness, since even on the elastic endless belt associated side of the paper web, a high smoothness of the web can be achieved and not, as in the known endless belts made of plastic, for example on a hard and heated counter roll produced smoothness of the web is partially deteriorated again by the contact with the known endless belt.
  • the endless belt according to the invention can be easily provided with surface roughnesses Ra below 0.05 ⁇ m.
  • the carbon nanotubes are preferably crosslinked with one another in the matrix material of the endless belt. It has been shown that thereby the bending fatigue strength of the endless belt is greater by at least one power of ten compared to endless belts with conventional nanoparticles.
  • the tensile strength of the carbon nanotubes is above 40 GPa. With such a tensile strength they are today's usual and planned loads in calenders and other processing machines grown with perfect break resistance. A change of the endless belt can be planned for the user of the endless belt, since the wear interval is known from experience and it no longer comes to extraordinary endless belt changes due to overstretching.
  • the carbon nanotubes have a thermal conductivity of more than 5000 W / mK.
  • a uniform heat distribution in the endless belt is ensured so that partial high pressure loads can no longer lead to so-called hot spots (these are places where the endless belt is heated inadmissibly).
  • the production of the elastic endless belt can take place in known manner, for example by injection, casting or winding method on an endless belt core, wherein inventively carbon nanotubes introduced into the elastic matrix material or coated in a winding process with this. It is particularly favorable if the endless belt is composed of strip-like or filamentary base components which contain the matrix material and the carbon nanotubes. The base material strips or threads can then be glued, welded, interwoven or melted, for example. This ensures a uniform distribution of the carbon nanotubes.
  • the endless belt it is useful not only to give the endless belt the property of high smoothness, so that in a pressure treatment the web of material, the smoothness of the endless belt is virtually transferred, but also to allow him a certain porosity. This makes it possible to extract or supply moisture to a material web. Due to the long carbon nanotubes in the remaining matrix material, the strength of the endless belt is ensured even with porosity.
  • the band if it is additionally heated.
  • the effectiveness of a calendering or drying process of a material web is significantly improved by the supply of heat. This can be done inductively, if the endless belt additionally contains magnetizable particles or is heated from the outside via a hot air blower. Accordingly, the endless belt should then be able to cope with temperatures in the order of 100 ° C without damage.

Landscapes

  • Paper (AREA)
EP20090163215 2008-07-25 2009-06-19 Bande sans fin pour le traitement de bandes de matériau formées de manière plane Not-in-force EP2148002B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810040728 DE102008040728A1 (de) 2008-07-25 2008-07-25 Endlosband zur Bearbeitung flächig ausgebildeter Materialbahnen

Publications (2)

Publication Number Publication Date
EP2148002A1 true EP2148002A1 (fr) 2010-01-27
EP2148002B1 EP2148002B1 (fr) 2012-08-29

Family

ID=41171233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090163215 Not-in-force EP2148002B1 (fr) 2008-07-25 2009-06-19 Bande sans fin pour le traitement de bandes de matériau formées de manière plane

Country Status (3)

Country Link
EP (1) EP2148002B1 (fr)
CN (1) CN101634122B (fr)
DE (1) DE102008040728A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005014708A1 (fr) * 2003-06-23 2005-02-17 William Marsh Rice University Elastomeres renforces par des nanotubes de carbone
WO2005090429A1 (fr) 2004-03-16 2005-09-29 Albany International Corp. Courroies revetues de polyurethane et recouvrements de rouleau comprenant des nanocharges
EP1770202A2 (fr) * 2005-09-30 2007-04-04 Voith Patent GmbH Toile pour machine à papier
DE102005054509A1 (de) * 2005-11-16 2007-05-24 Voith Patent Gmbh Papiermaschinenbespannung
WO2009004122A1 (fr) * 2007-07-05 2009-01-08 Tamfelt Pmc Oy Courroie de presse à sabot

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5571382B2 (ja) * 2006-07-31 2014-08-13 トプヒム・ナムローゼ・フェンノートシャップ カプセル化小滴形状の粒子、及び当該粒子の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005014708A1 (fr) * 2003-06-23 2005-02-17 William Marsh Rice University Elastomeres renforces par des nanotubes de carbone
WO2005090429A1 (fr) 2004-03-16 2005-09-29 Albany International Corp. Courroies revetues de polyurethane et recouvrements de rouleau comprenant des nanocharges
EP1770202A2 (fr) * 2005-09-30 2007-04-04 Voith Patent GmbH Toile pour machine à papier
DE102005054509A1 (de) * 2005-11-16 2007-05-24 Voith Patent Gmbh Papiermaschinenbespannung
WO2009004122A1 (fr) * 2007-07-05 2009-01-08 Tamfelt Pmc Oy Courroie de presse à sabot

Also Published As

Publication number Publication date
CN101634122A (zh) 2010-01-27
EP2148002B1 (fr) 2012-08-29
DE102008040728A1 (de) 2010-01-28
CN101634122B (zh) 2013-03-13

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