EP2831338A1 - Walzenbezug - Google Patents
WalzenbezugInfo
- Publication number
- EP2831338A1 EP2831338A1 EP13711413.8A EP13711413A EP2831338A1 EP 2831338 A1 EP2831338 A1 EP 2831338A1 EP 13711413 A EP13711413 A EP 13711413A EP 2831338 A1 EP2831338 A1 EP 2831338A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll cover
- filler
- fillers
- cover according
- roll
- 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
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
- D21F3/08—Pressure rolls
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
- D21G1/0246—Hard rolls
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
- D21G1/0233—Soft rolls
Definitions
- the invention relates to a roll cover, in particular for use in calenders and calenders, according to the preamble of claim 1.
- patent EP 1 612 392 B1 discloses specific properties of the roll cover, such as the abrasion resistance and the printing modulus (for example, determined according to EN ISO 604: 2003 section 3.6) by the use of nanoparticles, also in combination with larger particles, to the respective requirements to adjust and model in the selected roll position.
- the proportions of fillers used are always a compromise between the various demands on the roll cover. To achieve the highest possible abrasion resistance and the desired high pressure module, the highest possible degree of filling is desirable.
- an increasing filler content leads, starting from certain limits, to an increasing embrittlement of the material and thus an increasing risk of massive damage in case of selective overloading or occurring thermal stresses. It is accordingly an object of the invention to overcome the known disadvantages of the prior art and to provide a roll cover, which shows both a high pressure modulus and good abrasion resistance with low surface roughness during operation and the lowest possible brittleness.
- At least three fillers are present, which each have different average particle sizes.
- a first filler may have an average particle size in the range from 1 to 100 nm, preferably from 5 to 50 nm, particularly preferably from 10 to 30 nm.
- an average particle size in the range from 1 to 100 nm, preferably from 5 to 50 nm, particularly preferably from 10 to 30 nm.
- a second filler may have an average particle size in the range from 50 to 2000 nm, preferably from 100 to 500 nm, particularly preferably from 100 to 300 nm, and advantageously performs a bridging function between large and small fillers. It reduces the erosion of the resin matrix on the free surface between the large fillers.
- a third filler may have an average particle size in the range from 0.5 to 15 ⁇ m, preferably from 1 to 7 ⁇ m, particularly preferably from 2 to 4 ⁇ m, and thus bring about a further increase in the pressure modulus and an increase in the abrasion resistance.
- the grain size distributions of the at least three fillers may be selected to be overlapping or non-overlapping.
- the property profile of the roll cover can be further influenced.
- at least two of the fillers, in particular three of the fillers can be chemically identical.
- the at least three fillers may be different.
- suitable fillers for example high hardness or good matrix connection
- morphologies for example spherical particles with high abrasion resistance to achieve the same in operation resulting surface roughness or rod-shaped or fibrous fillers for structural reinforcement
- At least the second and / or the filler may be selected from: oxides, carbides, nitrides, aluminum silicates, silicates of mineral or synthetic origin or mixtures thereof. These have a high hardness and abrasion resistance and are commercially available in a variety of forms.
- the first filler may further be selected from: oxides, carbides, nitrides, aluminum silicates, silicates, sulfates, carbonates, phosphates, titanates, carbonanotubes, carbonanofibres, metals of mineral or synthetic origin or mixtures thereof.
- the fillers, in particular the first filler can be surface-modified, which allows a better attachment to the resin matrix.
- the content of fillers in the matrix system may be between 0.5 and 30% by volume. This value represents a good middle ground for the maximum achievable abrasion resistance at the required elasticity.
- the content of the first filler is 0.5 to 20% by volume, preferably 1.5 to 15% by volume, while the content of the second filler is 0.5 to 5% by volume, preferably 1 to 3% by volume and the content of the third filler 0.5 to 20% by volume, preferably 3 to 15% by volume.
- the matrix system may preferably be a duroplastic, in particular an amine or anhydride crosslinked or a self-crosslinking epoxy resin or an isocyanate ester or mixtures thereof.
- a duroplastic in particular an amine or anhydride crosslinked or a self-crosslinking epoxy resin or an isocyanate ester or mixtures thereof.
- Such resin systems are commercially available in a wide range and can be selected according to requirements. The invention will be explained in more detail below.
- Calenders or calenders for fibrous webs such as paper or board webs have the task of smoothing the fibrous web either directly after its production (online) or even later (offline).
- the roller covers of existing rollers in a calender highest demands are placed on the one hand in terms of their surface quality and on the other hand in terms of their resistance to thermal and mechanical stresses.
- a plurality of rolls are arranged in a stack in a stack, wherein according to a common embodiment, a metallic heatable roll runs against an unheated elastic roll to form a nip.
- a first side of the fibrous web is smoothed by pressure and heat.
- a so-called alternating tip is usually provided approximately in the middle of the stack, after which the other side of the fibrous web comes into contact with the smoothing heating rollers. From this constellation arises immediately the need to make the roll surface of the unheated elastic rolls as smooth as possible, so that the previously achieved smoothness of the fibrous web is not nullified.
- the roll covers of the unheated rolls usually consist of at least one, often also of several layers of various materials such as rubber, polyurethane or fiber-reinforced plastics, which are applied to a roll body. Fiber-reinforced plastics are usually the material of choice for use in the calender since they have high temperature resistance as well as high mechanical strength and good abrasion resistance.
- Such plastics usually have a matrix system of a resin and embedded fiber reinforcement of glass, carbon or aramid fibers or similar other suitable fibers as a reinforcement.
- the production of such roll covers is well known, so that only a brief summary is given here.
- the preparation can be carried out according to various known methods. On the one hand, it is possible to wrap the fibers dry and apply the matrix by a casting process. Another common method provides that fiber bundles, so-called rovings, are drawn through a resin bath containing the resin matrix and then wet-wound onto the roll body. Also, injection molding processes in which the matrix material is applied by axially movable nozzles on a rotating roller body, are known and suitable for producing a roll cover according to the invention. In this case, the structure can take place in one or more layers, and it is also possible to provide further layers, such as, for example, a base layer, which serves for the bonding between roll core and roll cover, and additional bonding layers.
- the measures according to the invention relate to a functional layer of the roll cover, which comes into contact with the fibrous web.
- Suitable matrix systems include amine, anhydride crosslinked but also self-crosslinking epoxy resins, isocyanate esters or other thermosets or mixtures thereof.
- a hereinafter referred to as a first filler component having a particle size in the range between 1 to 100 nanometers takes over an effect as a crack stopper and causes an associated increase in mechanical strength and an increase in the pressure module. Prerequisite for this is a good integration with the matrix and an even distribution of the Particles in the matrix. Due to the increased pressure modulus, the substantially pressure-induced wear mechanism of a calender results in a significant later onset of heavy wear, since the deformation and thus the occurring stresses are reduced.
- a component referred to hereinafter as a third filler which is also referred to as "large" hard materials, has an average grain size in the single-digit to low tens of microns, increases primarily the resistance to abrasive wear and leads to a further increase in the pressure modulus.
- a component which is referred to as a second filler and has medium particle sizes of the order of 0.1 to 1 micrometers.
- the second filler fulfills a bridging function between the other two fillers and, inter alia, reduces matrix erosion by means of indented particles originating from the fibrous web or the coating medium between the "large" hard materials.
- a comparable effect is not or only very difficult to achieve reproducible by particularly broad particle size distributions of a filler, because particles with such broad particle size distributions almost always have significant fluctuations between the particle size distributions of individual batches.
- Table 1 shows a summary of the mean particle sizes and the possible particle size distributions of the fillers and the respective degree of filling.
- Average particle size 1 - 100 nm 50 - 2000 nm 0.5 - 15 ⁇
- the materials for the third filler preferably originate from a first group comprising oxides, carbides, nitrides, aluminum silicates, silicates of mineral or synthetic origin or also glasspheres or mixtures thereof.
- Suitable materials for the first filler are the materials from the first group, but also from a second group comprising sulfates, carbonates, phosphates, titanates, Carbonanotubes, Carbonanofibres, metals of mineral or synthetic origin or mixtures thereof in question.
- the choice of material of the second filler can be made from two groups.
- second and third fillers are selected from the same group, more preferably from the first group.
- the first filler may be with or without surface modification, e.g. can be used with poly L-Iactide coated S1O2 for better attachment to the matrix.
- the optimum composition depends on the specific selected fillers, their particle size distribution and morphology as well as the desired hardness or the desired pressure modulus and the required surface roughness during operation.
- the three fillers can be selected from a wide range of suitable commercially available components in the particular grain sizes required. Through the selection specifically different properties, such as a high hardness or a good matrix connection can be emphasized.
- the morphologies of the three fillers can also be chosen from a wide range.
- spherical particles such as glass spheres with high abrasion resistance to achieve high hardness at low operating surface roughness resulting useful and feasible.
- Rod-shaped or fibrous fillers such as carbonanotubes can be used for structural reinforcement and for optimizing the overall system.
- the three fillers may preferably be distributed as homogeneously as possible in one layer. However, it is also possible to achieve gradients within the layer or targeted stepwise changes by suitable modification of the above-described application methods.
Landscapes
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012205206A DE102012205206A1 (de) | 2012-03-30 | 2012-03-30 | Walzenbezug |
| PCT/EP2013/056077 WO2013144015A1 (de) | 2012-03-30 | 2013-03-22 | Walzenbezug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2831338A1 true EP2831338A1 (de) | 2015-02-04 |
| EP2831338B1 EP2831338B1 (de) | 2017-05-10 |
Family
ID=47915257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13711413.8A Active EP2831338B1 (de) | 2012-03-30 | 2013-03-22 | Walzenbezug |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10145065B2 (de) |
| EP (1) | EP2831338B1 (de) |
| CN (1) | CN104204347A (de) |
| DE (1) | DE102012205206A1 (de) |
| WO (1) | WO2013144015A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9829882B2 (en) | 2013-12-20 | 2017-11-28 | Sphero, Inc. | Self-propelled device with center of mass drive system |
| AU2016357211B2 (en) * | 2015-11-17 | 2019-10-03 | Stowe Woodward Licensco, Llc | Polyurethane roll cover for calender roll for papermaking machine |
| CN114987941A (zh) * | 2022-06-22 | 2022-09-02 | 汕头市强宇包装材料有限公司 | 一种高阻隔可降解环保纸张的生产工艺及设备 |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3724047A (en) * | 1969-03-12 | 1973-04-03 | Minnesota Mining & Mfg | Inking sleeve |
| FI80097B (fi) * | 1988-04-28 | 1989-12-29 | Valmet Paper Machinery Inc | Vals i presspartiet av en pappersmaskin och foerfarande foer framstaellning av denna. |
| US5167068A (en) | 1988-04-28 | 1992-12-01 | Valmet Paper Machinery Inc. | Method for manufacturing a roll directly contacting a web |
| DE4226789A1 (de) | 1992-08-13 | 1994-02-17 | Sigri Great Lakes Carbon Gmbh | Faserverstärkte Kunststoffwalze mit äußerer, verschleißfester, füllerhaltiger Kunststoffschicht |
| CN1037371C (zh) * | 1994-01-17 | 1998-02-11 | 河北省安平县第四烟花爆竹厂 | 训练用手榴弹及其制作方法 |
| US6409645B1 (en) * | 1997-06-13 | 2002-06-25 | Sw Paper Inc. | Roll cover |
| US6375602B1 (en) * | 1998-07-23 | 2002-04-23 | Sw Paper Inc. | Supercalendar roll with composite cover |
| CN100362072C (zh) * | 2000-06-20 | 2008-01-16 | 三洋化成工业株式会社 | 组装树脂辊子用的粘接剂及树脂辊子 |
| US20050082720A1 (en) * | 2003-01-23 | 2005-04-21 | Bloom Joy S. | Moldings of liquid crystalline polymer powders |
| US7736468B2 (en) * | 2004-03-16 | 2010-06-15 | Albany International Corp. | Belts and roll coverings having a nanocomposite coating |
| DE102004025116A1 (de) | 2004-05-21 | 2005-12-08 | Voith Paper Patent Gmbh | Faserverbund Walzenbezug |
| DE102005002639A1 (de) * | 2005-01-20 | 2006-07-27 | Voith Paper Patent Gmbh | Verfahren zur Herstellung eines Walzenbezugs |
| AT502579A1 (de) * | 2005-09-29 | 2007-04-15 | Voith Paper Patent Gmbh | Faserverbund walzenbezug |
| FI20070244A0 (fi) * | 2007-03-23 | 2007-03-23 | Metso Paper Inc | Tela |
| DE102009029045A1 (de) * | 2009-08-31 | 2011-03-03 | Voith Patent Gmbh | Elastomermatrix mit einpolymerisierten Füllstoffen |
| DE102009029695A1 (de) * | 2009-09-23 | 2011-03-31 | Voith Patent Gmbh | Walzenbezug |
| DE102012201310A1 (de) * | 2012-01-31 | 2013-08-01 | Voith Patent Gmbh | Walzenbezug mit verbesserten dynamischen Eigenschaften und hohem Rückstellverhalten |
| DE102012207095A1 (de) * | 2012-04-27 | 2013-10-31 | Voith Patent Gmbh | Walze und Verfahren zu deren Herstellung |
-
2012
- 2012-03-30 DE DE102012205206A patent/DE102012205206A1/de not_active Withdrawn
-
2013
- 2013-03-22 EP EP13711413.8A patent/EP2831338B1/de active Active
- 2013-03-22 WO PCT/EP2013/056077 patent/WO2013144015A1/de not_active Ceased
- 2013-03-22 CN CN201380016867.XA patent/CN104204347A/zh active Pending
- 2013-03-22 US US14/389,421 patent/US10145065B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012205206A1 (de) | 2013-10-02 |
| US20150090133A1 (en) | 2015-04-02 |
| CN104204347A (zh) | 2014-12-10 |
| EP2831338B1 (de) | 2017-05-10 |
| WO2013144015A1 (de) | 2013-10-03 |
| US10145065B2 (en) | 2018-12-04 |
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