US20100252217A1 - Paper machine clothing with edge reinforcement - Google Patents
Paper machine clothing with edge reinforcement Download PDFInfo
- Publication number
- US20100252217A1 US20100252217A1 US12/566,979 US56697909A US2010252217A1 US 20100252217 A1 US20100252217 A1 US 20100252217A1 US 56697909 A US56697909 A US 56697909A US 2010252217 A1 US2010252217 A1 US 2010252217A1
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- United States
- Prior art keywords
- coating
- clothing according
- basic structure
- clothing
- fabric
- Prior art date
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- Abandoned
Links
- 230000002787 reinforcement Effects 0.000 title description 2
- 238000000576 coating method Methods 0.000 claims abstract description 87
- 239000011248 coating agent Substances 0.000 claims abstract description 84
- 229920002396 Polyurea Polymers 0.000 claims abstract description 27
- 239000002861 polymer material Substances 0.000 claims abstract description 7
- 229920001971 elastomer Polymers 0.000 claims abstract description 5
- 239000000806 elastomer Substances 0.000 claims abstract description 5
- 239000004744 fabric Substances 0.000 claims description 39
- 239000000463 material Substances 0.000 claims description 8
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 8
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 6
- 239000002105 nanoparticle Substances 0.000 claims description 5
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- -1 polyethylene terephthalate Polymers 0.000 claims description 2
- 239000002657 fibrous material Substances 0.000 claims 1
- 238000009877 rendering Methods 0.000 claims 1
- 239000000123 paper Substances 0.000 description 12
- 230000035699 permeability Effects 0.000 description 11
- 230000007062 hydrolysis Effects 0.000 description 7
- 238000006460 hydrolysis reaction Methods 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 150000004985 diamines Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 125000005442 diisocyanate group Chemical group 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 239000003586 protic polar solvent Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
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
- This invention relates to a clothing for a web-processing machine, in particular a paper machine, paperboard machine or tissue machine.
- the present invention provides a clothing for a web-processing machine, in particular a paper machine, paperboard machine or tissue machine, including a flat basic structure with an upper side and a lower side, and with a coating which is applied to the upper side and/or lower side and includes at least one polymer material, whereby the at least one polymer material is a polyurea, for example, an elastomer polyurea.
- a coating containing a polyurea By providing a coating containing a polyurea, a coating with a much improved adherence to the basic structure of the clothing, a far higher resistance to abrasion and a far higher resistance to chemicals is provided. The penetration of moisture into the material of the basic structure is prevented by the coating, leading to a clear improvement in the hydrolysis resistance of the clothing that is provided with said coating.
- inventive clothing is used in this case preferably but not exclusively, for applications in which the clothing is exposed to a high level of moisture combined with a high temperature.
- inventive clothing is used as a dryer fabric or a TAD mesh. It is, however, also possible that the inventive clothing is a press felt or a forming screen.
- One embodiment of the invention provides that the coating is applied only in some areas on the upper and/or underside of the basic structure. Alternatively it may be provided that the coating is applied to the entire upper- and/or underside of the basic structure. “In some areas” is to be understood specifically to mean that the coating is applied only to a section of the width of the clothing.
- the flat basic structure is a fabric.
- the fabric is hereby formed, for example, by monofilament threads.
- the threads which form the fabric are advantageously covered at least partly, for example, completely, by the coating.
- the entire fabric may be covered by the coating in that area in which the coating is applied to the fabric. In this way the threads of the fabric are protected from harmful ambient influences.
- the threads of the fabric are, for example, connected with each other due to the coating at the thread crossing points and/or thread contact areas.
- Thread contact areas are created, for example, when the polyurea coating is applied to that area in which the threads run parallel to each other and touch each other. This improves the dimensional stability of the inventive clothing.
- the accumulation of dirt in the thread crossing points is hereby clearly reduced. Since the threads are connected with each other, the interior abrasion of the clothing is further obviated or at least minimized, determined by the relative movement of the threads between each other
- the polyurea coating can accumulate also between the threads at the thread crossing points or contact areas and are separated from each other by this coating and are, so to speak, elastically stratified on the coating.
- the polyurea coating forms an elastic intermediate layer between threads at thread contact or thread crossing points.
- the inventive clothing it is possible to first produce the basic structure and to subsequently provide the completed basic structure with the coating. If the basic structure, for example, is in the embodiment of a woven fabric, then the fabric in this scenario is produced—in other words woven—first and is then provided with the coating.
- the basic structure is permeable for water and air.
- the coating can be applied in this connection such that the permeability is not affected by the coating, meaning that the clothing in the coated area has the same or essentially the same permeability as in the uncoated area.
- the permeability of the clothing in the coated area can be lower than the permeability in the uncoated area.
- the permeability of the clothing in the coated area can be a maximum of 20% less, for example a maximum of 15% less, for example a maximum of 10% less than in the uncoated area. With a fabric this is achieved, for example, by filling out the meshes of the fabric in at least some areas.
- the clothing in the coated area is impermeable for air and water and that the clothing in the uncoated area is permeable. This is achieved in particular by the upper side and the lower side of the basic structure in the coated area being covered completely by the coating.
- the coating is applied to the basic structure such that the thickness of the clothing in the coated area is equal to or only non-essentially greater than that in the uncoated area.
- essentially greater is understood to be a clothing thickness in the coated area which is a maximum 15%, in particular a maximum 10% greater than in the uncoated area.
- the thickness of the coating can be in the range of approximately 1 ⁇ m to approximately 6 ⁇ m, for example, in the range of approximately 3 ⁇ m to approximately 30 ⁇ m. Layer thicknesses in the range of 1-60 ⁇ m are advantageous if the clothing is permeable in the area of the coating.
- the fabric is, for example, a three-dimensionally structured fabric, in particular a TAD mesh.
- the inventive clothing can be used on a tissue machine on which the tissue web is formed on the clothing from the fibrous suspension and the formed tissue web is then conveyed on this clothing as far as the Yankee drying cylinder.
- the tissue web is charged in this case upstream from the drying cylinder with a hot air current and/or steam current.
- the fabric For the previously mentioned application it makes sense in particular for the fabric to include polyethylene terephthalate (“PET”) and/or polyamide (“PA”) and/or polyphenylene sulfide (“PPS”) threads. It is therefore possible that the fabric representing the basic structure is formed entirely from threads of one of the PET, PA or PPS materials. It is, however, also possible that the fabric is formed partially from threads from one of the first of the aforementioned materials and partially from threads of one of the subsequently aforementioned materials.
- PET polyethylene terephthalate
- PA polyamide
- PPS polyphenylene sulfide
- the inventive coating already possesses the advantageous properties when the polyurea is present in the coating with a weight fraction of 10% or more.
- the polyurea can be a two-component polyurea, whereby the one component of the two is, for example, a diisocyanate and the other of the two components is, for example, a diamine.
- a diamine is advantageous in particular due to its low viscosity, which permits auxiliary materials to be added without the viscosity and the mix behavior being affected thereby.
- a diisocyanate known under the trade-name Araltide AY 8683.
- the polyurea is a single-component polyurea.
- a single-component polyurea of this type may, for example, be moisture-hardening or moisture-crosslinking.
- a catalyst can be used to speed up the hardening or cross-linking reaction.
- Products to be considered as single-component polyurea are, for example, products produced by “Nitroil Performance Chemicals” under the label “PC MD 8.6” or “PC MD 11”.
- Single or two-component polyurea may, for example, be applied onto the basic structure in diluted form or as a solution in an organic solvent.
- the solvent used in this application is in particular a non-protic solvent.
- THF Tetrahydrofurane
- Single or two-component polyurea may, for example, be applied onto the basic structure in diluted form or as a solution in an organic solvent.
- the solvent used in this application is in particular a non-protic solvent.
- THF Tetrahydrofurane
- the coating including the polyurea possesses a temperature stability of 180° C. to 220° C. at a temperature reaction time of at least 2 minutes.
- temperature stability is to be understood to mean that the coating shows no degradation aspect, visible to the naked eye.
- an embodiment of the invention provides for the basic structure to be subjected, prior to the coating being applied, to a surface treatment at least at those points which are covered with the coating.
- the surface treatment can include, either alone or in combination, cleaning with a solvent or by way of corona discharge.
- the surface treatment can, for example, additionally include treatment of the basic structure with atmospheric pressure plasma.
- the atmospheric pressure plasma is an oxygen plasma.
- a second embodiment of the present invention provides for the coating to contain an additive which increases the wear stability of the coating and/or reduces the coefficient of friction of the coating.
- colloidal silicone dioxide, ultra high molecular weight polyethylene (“UHMW PE”) or boronitride can be cited, by way of example, as additives for use alone or in combination in this connection.
- the additive may include particles, in particular nanoparticles, or for it to be formed by particles, in particular nanoparticles.
- the longitudinal edges of the basic structure which are exposed to greater abrasion and/or an increased temperature stress, then it is an advantage in particular for the coating to be applied in the region of the two longitudinal edges of the basic structure.
- the increased temperature stress is caused especially in that the longitudinal edges along the edge areas of the clothing are not covered by a paper web and are therefore, for example, in a TAD machine, subjected directly to the full hot air flow.
- the coating when viewed in transverse machine direction—extends from each of the two longitudinal edges in direction toward the center of the clothing to a point where at least the two areas of the clothing are coated which are never in contact with the paper web during operation of the clothing.
- the coating can extend from each of the two longitudinal edges in direction toward the center of the clothing to a point that the two areas of the clothing are coated which only come into contact with the paper web only temporarily while the paper web is in contact with the clothing, for example, edge strip areas.
- coating can extend from the longitudinal edges over approximately 3 ⁇ 8 inch to 1 inch in the cross machine direction (“CMD direction”). In order to increase the hydrolysis stability the coating can extend from the longitudinal edges approximately 5 cm to 20 cm in CMD direction.
- a third embodiment of the present invention thus provides for the basic structure to have transverse edges, which extend in the CMD direction and can be joined together in order to render the basic structure endless while constructing a seam region, and for the coating to be applied in the region of the transverse edges.
- Possible application methods for applying the coating are, for example, dip-coating and subsequent wiping in order to equalize the coating, roll coating, knife-coating, spray coating or extrusion coating.
- FIG. 1 shows a first embodiment of an inventive clothing in a plan view of its upper side
- FIG. 2 shows the clothing from FIG. 1 in cross-sectional direction
- FIG. 3 shows a top view of the upper side of a second embodiment of an inventive clothing
- FIG. 4 shows a cross-directional view of the clothing depicted in FIG. 3 ;
- FIG. 5 is a device for the production of an inventive clothing.
- inventive clothing 1 in a plan view of upper side 2 .
- the represented clothing 1 is a TAD mesh.
- Mesh 1 has a flat basic structure which is formed by permeable fabric 3 woven from PET threads 4 and 5 .
- mesh 1 includes coating 6 which is applied respectively in the region of two longitudinal edges 7 and 8 extending in the machine direction (“MD direction”) and in edge areas 10 , 11 on fabric 3 on upper side 2 and on lower side 9 (shown only in FIG. 2 ). Between two coated edge areas 10 , 11 is an uncoated area 13 .
- coating 6 includes a polymer material, which in the example in question is formed by a two-component elastomer polyurea and nanoparticles 12 of boronitride.
- the wear stability of coating 6 is increased by boronitride nanoparticles 12 .
- Coated edge areas 10 , 11 extend in this case respectively by approximately 1 inch from longitudinal edges 7 and 8 in the CMD direction.
- the coating is applied in this case such that upper side 2 and lower side 9 of fabric 3 in coated edge areas 10 , 11 are covered completely by the coating and edge areas 10 , 11 are impermeable.
- FIG. 2 shows mesh 1 from FIG. 1 in the cross-sectional direction (CMD direction) in the region of coated edge area 10 and adjacent uncoated area 13 of fabric 3 . It is evident that the thickness of mesh 1 in coated edge area 10 is only non-essentially greater than in uncoated area 13 , whereby in the case in question the clothing thickness in coated edge area 10 is a maximum 5% greater than in uncoated area 13 .
- FIG. 3 shows a top view of upper side 102 of one embodiment of additional inventive clothing 101 .
- Illustrated clothing 1 represents a dryer fabric or TAD mesh.
- Mesh 101 has a flat basic structure which is formed by woven and permeable fabric 103 which consists of PET threads 104 and 105 .
- Mesh 101 further includes coating 106 which is applied respectively onto top side 102 of fabric 103 in edge regions 110 , 111 which run along two longitudinal edges 107 and 108 progressing in MD direction, and onto underside 109 which is only depicted in FIG. 4 .
- Non-coated area 113 is located between two coated edge areas 110 , 111 .
- coating 106 includes a polymer material which, in the current example, is composed by a single-component, or two-component elastomer polyurea.
- the two broken lines in the illustration in FIG. 3 separate paper contact area 114 of clothing 101 . That is, they separate an area which may be brought into contact with a paper web during operation of inventive mesh 101 from two paper-free areas 115 and 116 with which the paper web is never in contact during operation.
- coating 106 when viewed in cross machine direction (CMD)—extends from each of two longitudinal edges 107 and 108 in the direction toward the center of clothing 101 to a point where at least two areas 115 and 116 of clothing 101 are coated which are never in contact with the paper web during operation of clothing 101 .
- coating 106 even extends from each of two longitudinal edges 107 and 108 in CMD direction into a section of the paper contact area 114 .
- coating 106 is applied onto upper side 102 and underside 109 of fabric 103 in such a way that threads 104 and 105 are completely enveloped in coating 106 .
- threads 104 , 105 are connected with each other through coating 106 at thread crossing points 117 .
- Coating 106 has a thickness which may be in the range of approximately 1 ⁇ m to approximately 60 ⁇ m.
- the permeability of clothing 101 is not substantially affected by coating 106 , so that fabric 103 has a permeability in non-coated region 113 which is essentially the same as the permeability in two coated edge sections 110 , 111 .
- Essentially the same permeability in this context is to be understood to mean that the permeability in coated edge sections 110 , 111 is a maximum of 15%, for example, a maximum of 10% less than the permeability in non-coated section 113 .
- FIG. 4 shows mesh 101 of FIG. 3 in cross direction (CMD-direction) in the area of coated edge section 110 and non-coated section 113 of fabric 103 adjacent to it. It is evident that the coating forms a film which fully covers threads 104 , 105 in the coated edge area 110 and which connects threads 104 , 105 with each other at thread crossing points 117 .
- FIG. 5 shows a device for the production of an inventive clothing.
- a continuous basic structure in the embodiment of, for example, fabric 203 is stretched between two rolls 204 , 205 which are positioned parallel to each other.
- fabric 203 Prior to the application of coating 206 fabric 203 is pre-treated by way of atmospheric pressure plasma which is produced by plasma nozzle 207 .
- Applicator roll 209 is used to apply polyurea coating 206 with which the polyurea which was dissolved in an organic solvent is applied onto fabric 203 .
- the coating material is, for example, subjected to a heat treatment by way of dryer 208 , causing it to harden or cross-link and forming the coating.
Abstract
The invention relates to a clothing for a web-processing machine, in particular a tissue machine, including a flat basic structure with an upper side and a lower side, and with a coating which is applied to the upper side and/or lower side and includes at least one polymer material. At least one polymer material is a polyurea, in particular an elastomer polyurea.
Description
- This is a continuation of PCT application No. PCT/U.S.08/58135, entitled “PAPER MACHINE CLOTHING WITH EDGE REINFORCEMENT”, filed Mar. 25, 2008, which is incorporated herein by reference.
- 1. Field of the Invention
- This invention relates to a clothing for a web-processing machine, in particular a paper machine, paperboard machine or tissue machine.
- 2. Description of the Related Art
- To improve wear resistance and/or hydrolysis resistance, clothings for web-processing machines are often equipped in their edge region and/or seam region with a coating. These coatings frequently have the disadvantage of not adhering firmly enough to the threads of the, for example woven, structure of the clothing, and therefore, of flaking off the threads when exposed to the effects of tensile stress, abrasion forces, heat and moisture. In particular on dryer fabrics or through-air dryer (“TAD”) meshes, which are exposed to high temperature combined with a high level of moisture, and for this reason, are often equipped with or made from PET threads, it is a problem that the coatings known from the prior art flake off the PET threads after a short time already. These coatings frequently also improve the hydrolysis resistance of such meshes only to a limited extent or not at all.
- What is needed in the art is a clothing of the type initially referred to on which the described flaking does not occur or occurs only to a much reduced extent and through which the hydrolysis resistance of the herewith equipped clothing is improved.
- The present invention provides a clothing for a web-processing machine, in particular a paper machine, paperboard machine or tissue machine, including a flat basic structure with an upper side and a lower side, and with a coating which is applied to the upper side and/or lower side and includes at least one polymer material, whereby the at least one polymer material is a polyurea, for example, an elastomer polyurea.
- By providing a coating containing a polyurea, a coating with a much improved adherence to the basic structure of the clothing, a far higher resistance to abrasion and a far higher resistance to chemicals is provided. The penetration of moisture into the material of the basic structure is prevented by the coating, leading to a clear improvement in the hydrolysis resistance of the clothing that is provided with said coating.
- The inventive clothing is used in this case preferably but not exclusively, for applications in which the clothing is exposed to a high level of moisture combined with a high temperature. For example the inventive clothing is used as a dryer fabric or a TAD mesh. It is, however, also possible that the inventive clothing is a press felt or a forming screen.
- One embodiment of the invention provides that the coating is applied only in some areas on the upper and/or underside of the basic structure. Alternatively it may be provided that the coating is applied to the entire upper- and/or underside of the basic structure. “In some areas” is to be understood specifically to mean that the coating is applied only to a section of the width of the clothing.
- Preferably the flat basic structure is a fabric. The fabric is hereby formed, for example, by monofilament threads. In the section where the coating is applied the threads which form the fabric are advantageously covered at least partly, for example, completely, by the coating. The entire fabric may be covered by the coating in that area in which the coating is applied to the fabric. In this way the threads of the fabric are protected from harmful ambient influences.
- In addition, in the area(s) which is (are) provided with the coating the threads of the fabric are, for example, connected with each other due to the coating at the thread crossing points and/or thread contact areas. Thread contact areas are created, for example, when the polyurea coating is applied to that area in which the threads run parallel to each other and touch each other. This improves the dimensional stability of the inventive clothing. In addition, the accumulation of dirt in the thread crossing points is hereby clearly reduced. Since the threads are connected with each other, the interior abrasion of the clothing is further obviated or at least minimized, determined by the relative movement of the threads between each other
- In addition, trials conducted by the applicant have shown that the polyurea coating can accumulate also between the threads at the thread crossing points or contact areas and are separated from each other by this coating and are, so to speak, elastically stratified on the coating. In other words, the polyurea coating forms an elastic intermediate layer between threads at thread contact or thread crossing points.
- In order to produce the inventive clothing it is possible to first produce the basic structure and to subsequently provide the completed basic structure with the coating. If the basic structure, for example, is in the embodiment of a woven fabric, then the fabric in this scenario is produced—in other words woven—first and is then provided with the coating.
- Alternatively, it is possible to first provide a portion of the threads which make up the fabric with the coating, and to subsequently interweave the so coated threads during the production of the fabric.
- Advantageously the basic structure is permeable for water and air. Depending on the requirements, the coating can be applied in this connection such that the permeability is not affected by the coating, meaning that the clothing in the coated area has the same or essentially the same permeability as in the uncoated area. Alternatively, the permeability of the clothing in the coated area can be lower than the permeability in the uncoated area. For example, the permeability of the clothing in the coated area can be a maximum of 20% less, for example a maximum of 15% less, for example a maximum of 10% less than in the uncoated area. With a fabric this is achieved, for example, by filling out the meshes of the fabric in at least some areas.
- In addition, it is possible that the clothing in the coated area is impermeable for air and water and that the clothing in the uncoated area is permeable. This is achieved in particular by the upper side and the lower side of the basic structure in the coated area being covered completely by the coating.
- The coating is applied to the basic structure such that the thickness of the clothing in the coated area is equal to or only non-essentially greater than that in the uncoated area. In this connection, essentially greater is understood to be a clothing thickness in the coated area which is a maximum 15%, in particular a maximum 10% greater than in the uncoated area. The thickness of the coating can be in the range of approximately 1 μm to approximately 6 μm, for example, in the range of approximately 3 μm to approximately 30 μm. Layer thicknesses in the range of 1-60 μm are advantageous if the clothing is permeable in the area of the coating.
- The fabric is, for example, a three-dimensionally structured fabric, in particular a TAD mesh.
- The inventive clothing can be used on a tissue machine on which the tissue web is formed on the clothing from the fibrous suspension and the formed tissue web is then conveyed on this clothing as far as the Yankee drying cylinder. The tissue web is charged in this case upstream from the drying cylinder with a hot air current and/or steam current.
- For the previously mentioned application it makes sense in particular for the fabric to include polyethylene terephthalate (“PET”) and/or polyamide (“PA”) and/or polyphenylene sulfide (“PPS”) threads. It is therefore possible that the fabric representing the basic structure is formed entirely from threads of one of the PET, PA or PPS materials. It is, however, also possible that the fabric is formed partially from threads from one of the first of the aforementioned materials and partially from threads of one of the subsequently aforementioned materials.
- It has been discovered that the inventive coating already possesses the advantageous properties when the polyurea is present in the coating with a weight fraction of 10% or more.
- The polyurea can be a two-component polyurea, whereby the one component of the two is, for example, a diisocyanate and the other of the two components is, for example, a diamine. The use of a diamine is advantageous in particular due to its low viscosity, which permits auxiliary materials to be added without the viscosity and the mix behavior being affected thereby. Used in particular is a diisocyanate known under the trade-name Araltide AY 8683. Also preferably used is a diamine known under the trade-name Hardener HY 8683
- It is also conceivable that the polyurea is a single-component polyurea. A single-component polyurea of this type may, for example, be moisture-hardening or moisture-crosslinking. A catalyst can be used to speed up the hardening or cross-linking reaction. Products to be considered as single-component polyurea are, for example, products produced by “Nitroil Performance Chemicals” under the label “PC MD 8.6” or “PC MD 11”.
- Single or two-component polyurea may, for example, be applied onto the basic structure in diluted form or as a solution in an organic solvent. The solvent used in this application is in particular a non-protic solvent. For example, THF (Tetrahydrofurane) would be suitable as a non-protic solvent.
- The coating including the polyurea possesses a temperature stability of 180° C. to 220° C. at a temperature reaction time of at least 2 minutes. In this context, temperature stability is to be understood to mean that the coating shows no degradation aspect, visible to the naked eye.
- To improve further the adherence of the coating to the basic structure, an embodiment of the invention provides for the basic structure to be subjected, prior to the coating being applied, to a surface treatment at least at those points which are covered with the coating. The surface treatment can include, either alone or in combination, cleaning with a solvent or by way of corona discharge. The surface treatment can, for example, additionally include treatment of the basic structure with atmospheric pressure plasma. In this context, it is also possible that the atmospheric pressure plasma is an oxygen plasma.
- A second embodiment of the present invention provides for the coating to contain an additive which increases the wear stability of the coating and/or reduces the coefficient of friction of the coating. In particular, colloidal silicone dioxide, ultra high molecular weight polyethylene (“UHMW PE”) or boronitride can be cited, by way of example, as additives for use alone or in combination in this connection.
- In this connection, the additive may include particles, in particular nanoparticles, or for it to be formed by particles, in particular nanoparticles.
- As it is in particular the longitudinal edges of the basic structure which are exposed to greater abrasion and/or an increased temperature stress, then it is an advantage in particular for the coating to be applied in the region of the two longitudinal edges of the basic structure. The increased temperature stress is caused especially in that the longitudinal edges along the edge areas of the clothing are not covered by a paper web and are therefore, for example, in a TAD machine, subjected directly to the full hot air flow.
- Especially in order to increase the hydrolysis stability it is useful if the coating—when viewed in transverse machine direction—extends from each of the two longitudinal edges in direction toward the center of the clothing to a point where at least the two areas of the clothing are coated which are never in contact with the paper web during operation of the clothing. In order to further increase the hydrolysis stability of the inventive clothing the coating can extend from each of the two longitudinal edges in direction toward the center of the clothing to a point that the two areas of the clothing are coated which only come into contact with the paper web only temporarily while the paper web is in contact with the clothing, for example, edge strip areas.
- In order to increase the abrasion resistance, coating can extend from the longitudinal edges over approximately ⅜ inch to 1 inch in the cross machine direction (“CMD direction”). In order to increase the hydrolysis stability the coating can extend from the longitudinal edges approximately 5 cm to 20 cm in CMD direction.
- Also exposed to greater wear is the seam region. A third embodiment of the present invention thus provides for the basic structure to have transverse edges, which extend in the CMD direction and can be joined together in order to render the basic structure endless while constructing a seam region, and for the coating to be applied in the region of the transverse edges.
- Possible application methods for applying the coating are, for example, dip-coating and subsequent wiping in order to equalize the coating, roll coating, knife-coating, spray coating or extrusion coating.
- The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
-
FIG. 1 shows a first embodiment of an inventive clothing in a plan view of its upper side; -
FIG. 2 shows the clothing fromFIG. 1 in cross-sectional direction; -
FIG. 3 shows a top view of the upper side of a second embodiment of an inventive clothing; -
FIG. 4 shows a cross-directional view of the clothing depicted inFIG. 3 ; and -
FIG. 5 is a device for the production of an inventive clothing. - Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate embodiments of the invention, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
- Referring now to the drawings, and more particularly to
FIG. 1 , there is shown an embodiment of inventive clothing 1 in a plan view ofupper side 2. - The represented clothing 1 is a TAD mesh. Mesh 1 has a flat basic structure which is formed by
permeable fabric 3 woven fromPET threads - In addition mesh 1 includes
coating 6 which is applied respectively in the region of twolongitudinal edges edge areas 10, 11 onfabric 3 onupper side 2 and on lower side 9 (shown only inFIG. 2 ). Between twocoated edge areas 10, 11 is anuncoated area 13. - According to the present invention,
coating 6 includes a polymer material, which in the example in question is formed by a two-component elastomer polyurea andnanoparticles 12 of boronitride. The wear stability ofcoating 6 is increased byboronitride nanoparticles 12. - Coated
edge areas 10, 11 extend in this case respectively by approximately 1 inch fromlongitudinal edges upper side 2 andlower side 9 offabric 3 incoated edge areas 10, 11 are covered completely by the coating andedge areas 10, 11 are impermeable. -
FIG. 2 shows mesh 1 fromFIG. 1 in the cross-sectional direction (CMD direction) in the region ofcoated edge area 10 and adjacentuncoated area 13 offabric 3. It is evident that the thickness of mesh 1 incoated edge area 10 is only non-essentially greater than inuncoated area 13, whereby in the case in question the clothing thickness incoated edge area 10 is a maximum 5% greater than inuncoated area 13. -
FIG. 3 shows a top view ofupper side 102 of one embodiment of additionalinventive clothing 101. - Illustrated clothing 1 represents a dryer fabric or TAD mesh.
Mesh 101 has a flat basic structure which is formed by woven andpermeable fabric 103 which consists ofPET threads - Mesh 101 further includes
coating 106 which is applied respectively ontotop side 102 offabric 103 inedge regions longitudinal edges underside 109 which is only depicted inFIG. 4 .Non-coated area 113 is located between twocoated edge areas - In accordance with the
present invention coating 106 includes a polymer material which, in the current example, is composed by a single-component, or two-component elastomer polyurea. - The two broken lines in the illustration in
FIG. 3 separatepaper contact area 114 ofclothing 101. That is, they separate an area which may be brought into contact with a paper web during operation ofinventive mesh 101 from two paper-free areas - As can be seen in the illustration in
FIG. 3 coating 106—when viewed in cross machine direction (CMD)—extends from each of twolongitudinal edges clothing 101 to a point where at least twoareas clothing 101 are coated which are never in contact with the paper web during operation ofclothing 101. In this example, coating 106 even extends from each of twolongitudinal edges paper contact area 114. - In this scenario, coating 106 is applied onto
upper side 102 andunderside 109 offabric 103 in such a way thatthreads coating 106. In addition,threads coating 106 at thread crossing points 117. Coating 106 has a thickness which may be in the range of approximately 1 μm to approximately 60 μm. The permeability ofclothing 101 is not substantially affected by coating 106, so thatfabric 103 has a permeability innon-coated region 113 which is essentially the same as the permeability in twocoated edge sections - “Essentially the same permeability” in this context is to be understood to mean that the permeability in
coated edge sections non-coated section 113. -
FIG. 4 shows mesh 101 ofFIG. 3 in cross direction (CMD-direction) in the area ofcoated edge section 110 andnon-coated section 113 offabric 103 adjacent to it. It is evident that the coating forms a film which fully coversthreads coated edge area 110 and which connectsthreads -
FIG. 5 shows a device for the production of an inventive clothing. Here, a continuous basic structure in the embodiment of, for example,fabric 203 is stretched between tworolls coating 206fabric 203 is pre-treated by way of atmospheric pressure plasma which is produced byplasma nozzle 207.Applicator roll 209 is used to applypolyurea coating 206 with which the polyurea which was dissolved in an organic solvent is applied ontofabric 203. After the application of the coating material the coating material is, for example, subjected to a heat treatment by way ofdryer 208, causing it to harden or cross-link and forming the coating. - While this present invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
Claims (19)
1. A clothing for a machine which processes a web of fibrous material, the clothing comprising:
a flat basic structure including an upper side, a lower side, and a coating applied to at least one of said upper side and said lower side, said coating including at least one polymer material wherein said polymeric material is a polyurea.
2. The clothing according to claim 1 , wherein said polyurea is an elastomer polyurea.
3. The clothing according to claim 1 , wherein said coating is applied in a plurality of areas of said basic structure only on at least one of said upper side and said lower side of said basic structure.
4. The clothing according to claim 1 , wherein said coating is applied to at least one of all of said upper side and all of said lower side of said basic structure
5. The clothing according to claim 1 , wherein said flat basic structure is a fabric.
6. The clothing according to claim 5 , wherein said fabric includes a plurality of threads in an area of said fabric in which said coating is applied, said plurality of threads in said area being covered at least partly by said coating.
7. The clothing according to claim 5 , wherein said fabric is a three-dimensionally structured fabric.
8. The clothing according to claim 7 , wherein said three-dimensionally structured fabric is a through-air dryer mesh.
9. The clothing according to claim 5 , wherein said fabric includes at least one of a plurality of polyethylene terephthalate threads, a plurality of polyamide threads, and a plurality of polyphenylene sulfide threads.
10. The clothing according to claim 1 , wherein said polyurea is present in said coating with a weight fraction of at least 10%.
11. The clothing according to claim 1 , wherein said polyurea is a two-component polyurea.
12. The clothing according to claim 1 , wherein said basic structure includes a plurality of points covered with said coating, said basic structure having been subjected, prior to said coating being applied, to a surface treatment at said plurality of points which are covered with said coating.
13. The clothing according to claim 1 , wherein said coating includes an additive configured for at least one of increasing a wear stability of said coating and reducing a coefficient of friction of said coating.
14. The clothing according to claim 13 , wherein said additive includes at least one of colloidal silicone dioxide, ultra high molecular weight polyethylene, and boronitride.
15. The clothing according to claim 13 , wherein said additive includes a plurality of particles.
16. The clothing according to claim 13 , wherein said additive includes a plurality of nanoparticles.
17. The clothing according to claim 1 , wherein said basic structure includes two longitudinal edge regions each including a longitudinal edge of said basic structure, said coating being applied in each of said longitudinal edge regions.
18. The clothing according to claim 17 , wherein said coating extends from each said longitudinal edge over approximately ⅜ inch to approximately 1 inch in a cross machine direction.
19. The clothing according to claim 1 , wherein said basic structure includes two transverse edge regions each including a transverse edge of said basic structure, each transverse edge extending in a cross machine direction of the clothing, said transverse edges being joined together and thereby rendering said basic structure endless and forming a seam region, said coating being applied in said transverse edge regions.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/566,979 US20100252217A1 (en) | 2007-03-26 | 2009-09-25 | Paper machine clothing with edge reinforcement |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007015055.7 | 2007-03-26 | ||
DE200710015055 DE102007015055A1 (en) | 2007-03-26 | 2007-03-26 | Paper machine clothing with edge reinforcement |
PCT/US2008/058135 WO2008118909A1 (en) | 2007-03-26 | 2008-03-25 | Paper machine clothing with edge reinforcement |
US12/566,979 US20100252217A1 (en) | 2007-03-26 | 2009-09-25 | Paper machine clothing with edge reinforcement |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2008/058135 Continuation WO2008118909A1 (en) | 2007-03-26 | 2008-03-25 | Paper machine clothing with edge reinforcement |
Publications (1)
Publication Number | Publication Date |
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US20100252217A1 true US20100252217A1 (en) | 2010-10-07 |
Family
ID=42825217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/566,979 Abandoned US20100252217A1 (en) | 2007-03-26 | 2009-09-25 | Paper machine clothing with edge reinforcement |
Country Status (1)
Country | Link |
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US (1) | US20100252217A1 (en) |
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US9587139B2 (en) | 2012-06-15 | 2017-03-07 | 3M Innovative Properties Company | Curable polyurea forming composition, method of making, and composite article |
US20170274625A1 (en) * | 2014-09-19 | 2017-09-28 | Yamauchi Corporation | Industrial roll and method for manufacturing the same |
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