CN117626700A - Papermaking belt - Google Patents
Papermaking belt Download PDFInfo
- Publication number
- CN117626700A CN117626700A CN202310950823.XA CN202310950823A CN117626700A CN 117626700 A CN117626700 A CN 117626700A CN 202310950823 A CN202310950823 A CN 202310950823A CN 117626700 A CN117626700 A CN 117626700A
- Authority
- CN
- China
- Prior art keywords
- belt
- wet paper
- thread
- fiber
- yarn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002759 woven fabric Substances 0.000 claims abstract description 30
- 239000000758 substrate Substances 0.000 claims description 38
- 239000004744 fabric Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 abstract description 148
- 239000000835 fiber Substances 0.000 abstract description 93
- 229920005989 resin Polymers 0.000 description 151
- 239000011347 resin Substances 0.000 description 151
- -1 polyethylene terephthalate Polymers 0.000 description 49
- 229920005862 polyol Polymers 0.000 description 31
- 238000012546 transfer Methods 0.000 description 29
- 238000004519 manufacturing process Methods 0.000 description 19
- 150000003077 polyols Chemical class 0.000 description 18
- 239000000203 mixture Substances 0.000 description 17
- 230000004048 modification Effects 0.000 description 17
- 238000012986 modification Methods 0.000 description 17
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- 239000005056 polyisocyanate Substances 0.000 description 13
- 229920001228 polyisocyanate Polymers 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 150000001875 compounds Chemical class 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
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- 239000004417 polycarbonate Substances 0.000 description 10
- 229920000305 Nylon 6,10 Polymers 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 9
- 239000003431 cross linking reagent Substances 0.000 description 9
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- 229920003235 aromatic polyamide Polymers 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
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- 239000002184 metal Substances 0.000 description 7
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 229920000909 polytetrahydrofuran Polymers 0.000 description 6
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 5
- 229920002302 Nylon 6,6 Polymers 0.000 description 5
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 5
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical class C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
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- 239000005020 polyethylene terephthalate Substances 0.000 description 5
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- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 4
- PISLZQACAJMAIO-UHFFFAOYSA-N 2,4-diethyl-6-methylbenzene-1,3-diamine Chemical compound CCC1=CC(C)=C(N)C(CC)=C1N PISLZQACAJMAIO-UHFFFAOYSA-N 0.000 description 4
- 239000004953 Aliphatic polyamide Substances 0.000 description 4
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- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 229920001730 Moisture cure polyurethane Polymers 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 125000001931 aliphatic group Chemical group 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- GHLKSLMMWAKNBM-UHFFFAOYSA-N dodecane-1,12-diol Chemical compound OCCCCCCCCCCCCO GHLKSLMMWAKNBM-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
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- 239000002243 precursor Substances 0.000 description 3
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- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 3
- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 3
- XSMIOONHPKRREI-UHFFFAOYSA-N undecane-1,11-diol Chemical compound OCCCCCCCCCCCO XSMIOONHPKRREI-UHFFFAOYSA-N 0.000 description 3
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- ALQLPWJFHRMHIU-UHFFFAOYSA-N 1,4-diisocyanatobenzene Chemical compound O=C=NC1=CC=C(N=C=O)C=C1 ALQLPWJFHRMHIU-UHFFFAOYSA-N 0.000 description 2
- UNVGBIALRHLALK-UHFFFAOYSA-N 1,5-Hexanediol Chemical compound CC(O)CCCCO UNVGBIALRHLALK-UHFFFAOYSA-N 0.000 description 2
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- ALVZNPYWJMLXKV-UHFFFAOYSA-N 1,9-Nonanediol Chemical compound OCCCCCCCCCO ALVZNPYWJMLXKV-UHFFFAOYSA-N 0.000 description 2
- CTNICFBTUIFPOE-UHFFFAOYSA-N 2-(4-hydroxyphenoxy)ethane-1,1-diol Chemical compound OC(O)COC1=CC=C(O)C=C1 CTNICFBTUIFPOE-UHFFFAOYSA-N 0.000 description 2
- RWLALWYNXFYRGW-UHFFFAOYSA-N 2-Ethyl-1,3-hexanediol Chemical compound CCCC(O)C(CC)CO RWLALWYNXFYRGW-UHFFFAOYSA-N 0.000 description 2
- SDQROPCSKIYYAV-UHFFFAOYSA-N 2-methyloctane-1,8-diol Chemical compound OCC(C)CCCCCCO SDQROPCSKIYYAV-UHFFFAOYSA-N 0.000 description 2
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 2
- QWGRWMMWNDWRQN-UHFFFAOYSA-N 2-methylpropane-1,3-diol Chemical compound OCC(C)CO QWGRWMMWNDWRQN-UHFFFAOYSA-N 0.000 description 2
- QCDWFXQBSFUVSP-UHFFFAOYSA-N 2-phenoxyethanol Chemical compound OCCOC1=CC=CC=C1 QCDWFXQBSFUVSP-UHFFFAOYSA-N 0.000 description 2
- UDVRROYKHLBOPZ-UHFFFAOYSA-N 3,3-dihydroxy-2-methylpropanoic acid Chemical compound OC(O)C(C)C(O)=O UDVRROYKHLBOPZ-UHFFFAOYSA-N 0.000 description 2
- SXFJDZNJHVPHPH-UHFFFAOYSA-N 3-methylpentane-1,5-diol Chemical compound OCCC(C)CCO SXFJDZNJHVPHPH-UHFFFAOYSA-N 0.000 description 2
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical compound C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 description 2
- YIMQCDZDWXUDCA-UHFFFAOYSA-N [4-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCC(CO)CC1 YIMQCDZDWXUDCA-UHFFFAOYSA-N 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 125000002947 alkylene group Chemical group 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 125000000753 cycloalkyl group Chemical group 0.000 description 2
- KORSJDCBLAPZEQ-UHFFFAOYSA-N dicyclohexylmethane-4,4'-diisocyanate Chemical compound C1CC(N=C=O)CCC1CC1CCC(N=C=O)CC1 KORSJDCBLAPZEQ-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- SXCBDZAEHILGLM-UHFFFAOYSA-N heptane-1,7-diol Chemical compound OCCCCCCCO SXCBDZAEHILGLM-UHFFFAOYSA-N 0.000 description 2
- GJBXIPOYHVMPQJ-UHFFFAOYSA-N hexadecane-1,16-diol Chemical compound OCCCCCCCCCCCCCCCCO GJBXIPOYHVMPQJ-UHFFFAOYSA-N 0.000 description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 2
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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
- D21F1/0036—Multi-layer screen-cloths
-
- 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
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/086—Substantially impermeable for transferring fibrous webs
Landscapes
- Paper (AREA)
- Woven Fabrics (AREA)
Abstract
A papermaking belt in which end warpage in use is suppressed is provided. A papermaking belt for a papermaking machine having a first side on which wet paper is placed and a second side opposite to the first side, the papermaking belt comprising a fiber reinforced base material layer comprising at least one woven fabric, at least one of the woven fabrics having a double or more overlapped structure, the overlapped structure having a first thread and a second thread arranged in parallel, the first thread being arranged closer to the first side than the second thread, the second thread being arranged closer to the second side than the first thread, the fineness of the first thread being larger than that of the second thread.
Description
Technical Field
The present invention relates to papermaking belts.
Background
The paper machine is used for removing water from a paper raw material, and generally includes a wire section, a press section, and a drying section. The wire rod section, the squeezing section and the drying section are sequentially arranged along the conveying direction of the wet paper.
In each stage of such a paper machine, various papermaking belts are used for conveying wet paper, press wet paper, and the like. Examples of such a papermaking belt include: a wet paper transfer belt (conveyor belt) for conveying and transferring wet paper, a shoe press belt used in a shoe press mechanism, and the like.
Conventionally, as a paper machine for transferring wet paper by a wet paper conveyor in a press section, a closed type traction paper machine for transferring wet paper by a closed type traction operation is known. In the press section of the closed traction papermaking machine, the wet paper is placed on a papermaking felt or a wet paper conveyor belt and conveyed, so that there is no part where the wet paper individually travels, thereby preventing paper breakage from occurring. Therefore, the sealed traction papermaking machine is excellent in high-speed running ability and operation stability.
Patent document 1 discloses a papermaking belt having 2 layers of resin materials, one layer being placed on one side of a cd support layer and the other layer being placed on the front side, in order to prevent end warpage due to different shrinkage properties of different materials, finishing processes, and the like.
Prior art literature
Patent literature
Patent document 1: international publication No. 03/071030
Disclosure of Invention
In addition, when using papermaking belts, automatic guiding devices, so-called guides, are sometimes used in order to prevent snaking of the papermaking belt. The guide typically detects the widthwise ends of the running papermaking belt and adjusts the running position of the belt. Wherein if warping occurs at the end of the belt, the guides cannot detect the exact position of the belt and cannot properly adjust the belt's running position. As a result, it is difficult to stably use the papermaking belt.
Also, papermaking belts are typically used in the presence of water, i.e., in a wet state. Therefore, it is necessary to consider a state in which the end portion of the papermaking belt warps in a wet paper state. The purpose of the papermaking belt described in patent document 1 is to prevent the end portion of the mere finished papermaking belt from warping, and the problem of end portion warping in the wet state is not considered.
Accordingly, an object of the present invention is to provide a papermaking belt capable of suppressing end warpage during use.
As a result of intensive studies to achieve the above object, the present inventors have found that the base layer constituting the papermaking belt exerts a large influence on the end warpage of the papermaking belt during use. Further, it was found that by using a woven fabric having an overlapping structure in a base fabric layer and controlling the fineness of the yarns of the overlapping structure, the warp of the end portion of a papermaking belt can be suppressed, and as a result of further intensive studies, the present invention has been completed.
The gist of the present invention is as follows.
[1] A papermaking belt for a papermaking machine having a first side on which wet paper is disposed and a second side opposite the first side, characterized in that,
has a fiber-reinforced substrate layer comprising at least one woven fabric,
at least one layer of the woven cloth has overlapping tissues with more than two layers,
The overlapping tissue has a first thread and a second thread arranged in parallel,
the first wire is disposed closer to the first face than the second wire, the second wire is disposed closer to the second face than the first wire,
the titer of the first thread is greater than the titer of the second thread.
[2] The papermaking belt of item [1], wherein said second strand is crimped.
[3] The papermaking belt of [1] or [2], wherein said second strand is a multifilament twisted yarn.
[4] The papermaking belt according to any one of [1] to [3], wherein said first wire and said second wire are arranged along a mechanical direction of the belt.
[5] The papermaking belt according to any one of [1] to [4], characterized in that it does not have a ply of butt fibers.
[6] The papermaking belt according to any one of [1] to [5],
the fabric having the overlapping weave further has a third thread interwoven with the first and second threads,
the third thread is a monofilament twisted thread.
[7] The papermaking belt according to any one of [1] to [6],
the fabric having the overlapping weave further has a third thread interwoven with the first and second threads,
The overlapping tissue is a tissue having a repeating unit capable of simultaneously forming a repeat of making the third thread pass through the L second face sides of the first thread while passing through the K first face sides of the first thread, and a repeat of making the third thread pass through the N second face sides of the second thread while passing through the M first face sides of the second thread,
satisfies the relation that K/L is larger than or equal to N/M.
[8] The papermaking belt according to any one of [1] to [7],
the fabric having the overlapping weave further has a third thread interwoven with the first and second threads,
the number of intersections of the first line with the third line in the intact tissue is greater than the number of intersections of the second line with the third line in the intact tissue.
[9] The papermaking belt according to any one of [1] to [8], characterized in that it is a wet paper conveyor belt.
[10] The papermaking belt according to any one of [1] to [8], characterized in that it is a shoe press belt.
With the above configuration, a papermaking belt with suppressed end warpage during use can be provided.
Drawings
FIG. 1 is a cross-sectional view in the cross-machine direction showing an example of a papermaking belt according to a preferred embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the fiber reinforced substrate provided with the papermaking belt of the preferred embodiment of the present invention.
FIG. 3 is a complete weave pattern of a woven fabric of a fiber-reinforced substrate provided with a papermaking belt according to a preferred embodiment of the present invention.
FIG. 4 is a complete weave pattern of a woven fabric of a fiber-reinforced substrate provided with a papermaking belt according to a preferred embodiment of the present invention.
Fig. 5 is an enlarged cross-sectional view of a fiber-reinforced base material included in a papermaking belt according to a modification of the present invention.
FIG. 6 is a complete weave diagram of a woven fabric of a fiber-reinforced base material provided in a papermaking belt according to a modification of the present invention.
FIG. 7 is a complete weave diagram of a woven fabric of a fiber-reinforced base material provided in a papermaking belt according to a modification of the present invention.
Fig. 8 is a cross-machine-sectional view of a papermaking belt according to another variation of the present invention.
Figure 9 is a schematic view illustrating a preferred embodiment of the method of making a papermaking belt of the present invention.
FIG. 10 is a schematic view illustrating a preferred embodiment of the method of making a papermaking belt of the present invention.
FIG. 11 is a schematic view illustrating another preferred embodiment of the method of making a papermaking belt of the present invention.
FIG. 12 is a schematic view illustrating another preferred embodiment of the method of making a papermaking belt of the present invention.
Fig. 13 is a schematic diagram for explaining an evaluation method of the end warpage of the wet paper conveyance belt used in the example.
Fig. 14 is a schematic diagram for explaining an evaluation method of the end warpage of the wet paper conveyance belt used in the example.
Fig. 15 is a schematic view showing an example of a belt and an automatic guiding device mounted on a paper machine.
Fig. 16 is a schematic view illustrating a relationship between warpage in an end portion of the papermaking belt and a detecting portion (palm) of the automatic guiding device.
Detailed Description
Hereinafter, preferred embodiments of the papermaking belt of the present invention will be described in detail with reference to the accompanying drawings.
< 1. Relationship between papermaking belt and automatic guiding device >)
First, the relationship between the papermaking belt and the automatic guiding device is described before the papermaking belt of the present invention is described.
Fig. 15 is a schematic view showing an example of a belt and an automatic guiding device mounted on a paper machine, and fig. 16 is a schematic view illustrating a relationship between warpage and a detecting portion (palm) of the automatic guiding device in an end portion of the belt.
The papermaking belt 101 shown in fig. 15 is an endless belt and is run by a roll. The automatic guiding device 110 is a device for adjusting the running position of the papermaking belt 101 so that the running position of the papermaking belt 101 does not deviate from the driving side or the non-driving side of the papermaking machine during running. The automatic guiding device 110 often detects the position of the papermaking belt 101 while adjusting the traveling position of the papermaking belt 101 by changing the angle of the traveling direction of the papermaking belt 101 relative to the guide roll 102 so that the papermaking belt 101 is in place.
In order to control the angle of the guide roller 102, an end portion of an actuator 106 such as an air spring is connected to a bearing on the side of the guide roller 102, and a structure in which a coil spring 107 is attached and the actuator 106 and the coil spring 107 are balanced is generally employed. By applying air pressure to the actuator 106, the bearing 108 on one side moves with the bearing 109 on the other side as a fulcrum. But also the position of the guide roller 102 (angle with respect to the direction of travel of the belt 101) is determined such that the force of the actuator 106 pushing the bearing 108 is balanced against the reaction force of the spiral spring 107.
As a means for detecting the position of the belt 101 and supplying the air pressure to the actuator 106 of the guide roll 102, an air pressure adjusting device 104 having a palm-type position detector is generally used. The constant air pressure (supply pressure) is supplied to the air pressure adjusting device 104 through the pressure reducing valve 105, and the end of the paper making belt 101 in operation is brought into contact with the palm 103. Further, the change in position of the end 1011 of the papermaking belt 101 is detected as displacement of the contacted palm 103, and a part or all of the supplied air in the interior of the air pressure adjusting device 104 is released to the atmosphere due to the displacement of the palm 103 thereof, and the residual pressure is regarded as the output pressure of the air pressure adjusting device 104. By supplying the air of the output pressure to the actuator 106, the position of the guide roller 102 can be adjusted.
Here, the relationship between palm 103 and end 1011 of papermaking belt 101 will be discussed. As shown in fig. 16, when the papermaking belt 101 is not warped (papermaking belt 101 '), the end 1011' of the papermaking belt 101 'contacts the palm 103 at a proper position, and the automatic guiding device 110 can accurately detect the position of the papermaking belt 101'. On the other hand, when the end 1011 of the belt 101 is warped, the presence of the end 1011, such as at a distance D from the location where it is intended to be detected, may occur due to the warping of the end 1011; palm 103 cannot contact end 1011; palm 103 is in contact with end 1011 at a position distant from the position where it is intended to be in contact; contact with a portion other than the palm 103 of the automatic guiding device 110, and the like.
As such, if the papermaking belt 101 warps, the automatic guiding device 110 cannot accurately detect the position of the papermaking belt 101, and thus it is difficult to stably use the papermaking belt 101. In the above description, the palm-type automatic guiding device using the palm as the automatic guiding device has been described as a possible problem due to warpage of the papermaking belt, but similar problems may occur from other machine-type automatic guiding devices or optical-type automatic guiding devices in which the position of the papermaking belt is adjusted by detecting the end of the papermaking belt.
In view of these circumstances, the present inventors developed a papermaking belt in which end warp was suppressed during use as described below.
< 2 > Wet paper conveying Belt (papermaking Belt) >, paper-making machine
Next, a papermaking belt according to a preferred embodiment of the present invention will be described.
Fig. 1 is a machine cross-sectional view showing an example of a wet paper transfer belt (papermaking belt) according to a preferred embodiment of the present invention, fig. 2 is an enlarged cross-sectional view of a fiber-reinforced base material of the wet paper transfer belt shown in fig. 1, and fig. 3 and 4 are complete tissue diagrams of a woven fabric of the fiber-reinforced base material of the wet paper transfer belt shown in fig. 1. In the drawings, the sizes of the respective components are appropriately emphasized for convenience of explanation, and are not shown in accordance with the actual proportions and sizes of the respective components. The machine transverse direction (Cross Machine Direction) is also referred to as "CMD", and the machine direction (Machine Direction) is also referred to as "MD". In the present embodiment, the wet paper web is described as an example of the papermaking belt, but the papermaking belt of the present invention is not limited thereto.
The wet paper transfer belt (papermaking belt) 1 shown in fig. 1 is a device for transferring wet paper W in a press section of a papermaking machine. The wet paper conveyance belt 1 is formed into an endless belt-like body. That is, the wet paper conveyance belt 1 is an endless belt. The wet paper transfer belt 1 is usually disposed so that its circumferential direction is along the Machine Direction (MD) of the papermaking system.
The wet paper conveyance belt 1 has: a fiber-reinforced base material layer 11; a first resin layer (wet paper carrying side resin layer) 13 provided on one main surface (first surface 131) located on the outer surface side of the fiber reinforced base material layer 11; and a second resin layer (roller-side resin layer) 15 provided on the other main surface (second surface 151) on the inner surface side of the fiber reinforced base material layer 11, and these layers are laminated. The first resin layer 13 is a layer that forms the outer surface (outer peripheral surface) of the loop formed by the wet paper conveyance belt 1.
The fiber-reinforced substrate layer 11 is composed of a fiber-reinforced substrate 111 and a resin 113. The resin 113 is present in the fiber reinforced substrate layer 11 as a matrix resin so as to fill the gaps of the fibers in the fiber reinforced substrate 111. That is, a part of the resin 113 is impregnated into the fiber reinforced base material 111, and the fiber reinforced base material 111 is embedded in the resin 113.
The fiber reinforced base material 111 is a woven fabric having a double weave in the present embodiment, and has a first warp yarn 115, a second warp yarn 117, and a weft yarn 119. In the double structure of the fiber-reinforced base material 111, the first warp yarn 115 is arranged on the first surface 131 side (wet paper carrying side), and the second warp yarn 117 is arranged on the opposite side to the first surface 131 side, that is, on the second surface 151 side (roll side). The first warp yarn 115 and the second warp yarn 117 are arranged in parallel. The first warp yarn 115 and the second warp yarn 117 are arranged in a direction perpendicular to the paper surface in fig. 1 and 2, that is, in the Machine Direction (MD). On the other hand, the weft yarn 119 is arranged substantially perpendicular to the first warp yarn 115 and the second warp yarn 117, i.e., along the machine cross direction (CMD). The weft yarn 119 is interwoven with the first warp yarn 115 and the second warp yarn 117.
In fig. 1 and 2, a part of the structure of the fiber reinforced base material 111 is schematically shown for easy understanding.
In the present specification, "warp yarn" means a yarn disposed along a Machine Direction (MD) of a wet paper transfer belt (papermaking belt), that is, a circumferential direction, and "weft yarn" means a yarn disposed along a machine cross direction (CMD) of the wet paper transfer belt (papermaking belt), that is, a direction perpendicular to the circumferential direction and parallel to a first surface of the papermaking belt. In other words, the warp direction is set according to the machine direction in the papermaking belt and the papermaking machine, i.e., the wet paper transporting direction, and the weft direction is set according to the machine cross direction in the papermaking belt and the papermaking machine, i.e., the direction perpendicular to the wet paper transporting direction. The warp yarns may be arranged not parallel to the Machine Direction (MD) of the papermaking belt, but may also be arranged at an angle of, for example, within + -10 deg. relative to the Machine Direction (MD) of the papermaking belt. The weft thread may be disposed not parallel to the machine cross direction (CMD) of the papermaking belt, but may be disposed at an angle of, for example, within ±10° with respect to the machine cross direction (CMD) of the papermaking belt.
In the present embodiment, the fineness of the first warp yarn 115 is larger than the fineness of the second warp yarn 117. As a result, warpage of the end portions, that is, the end portions in the width direction (CMD), of the wet paper conveyance belt 1 during use is suppressed.
In more detail, the inventors found that: the end warpage of the wet paper conveyor belt during use includes not only the initial warpage that exists in the finished product that it just manufactured, but also the warpage that is caused by wetting with water or the like and the machine action in the paper machine during use. Further, the present inventors focused on the possibility that warpage of the wet paper web due to swelling of water or the like during use has the greatest influence on the warpage of the end portion of the papermaking belt during use.
Moreover, the present inventors found that: the fiber-reinforced base material includes a woven fabric having an overlapped structure, and furthermore, by adjusting the fineness of 2 parallel threads in the woven fabric, the warp of the end portion of the wet paper conveyance belt can be controlled. Specifically, by setting the fineness of the first thread on the first surface side on which the wet paper is placed to be larger than the fineness of the second thread on the opposite surface side, the density of the wet paper carrying side of the woven fabric is increased, and as a result, the rigidity of the wet paper carrying side is increased. As a result, warping of the end portion of the fiber reinforced base material having the woven fabric toward the wet paper carrying side is suppressed. As a result, warping of the end portion of the wet paper conveyance belt during use and warping toward the wet paper carrying side are prevented. Also, in the present embodiment, the first warp yarn 115 serves as a first yarn, and the second warp yarn 117 serves as a second yarn.
As described above, the fineness of the first warp yarn 115 may be larger than that of the second warp yarn 117, for example, 50dtex or more, preferably 100dtex or more, and more preferably 200dtex or more larger than that of the second warp yarn 117. As a result, the end warpage during use of the wet paper web conveyor 1 can be more effectively suppressed. The fineness of the first warp yarn 115 may be in the range of 3000dtex or less, preferably 2500dtex or less, and more preferably 1000dtex or less, greater than the fineness of the second warp yarn 117. As a result, warping of the end portion of the wet paper feed belt 1 toward the roller side due to the fineness of the first warp yarn 115 becoming excessively large compared to the fineness of the second warp yarn 117 can be suppressed.
The fineness of the first warp yarn 115 is, for example, 500dtex or more and 8000dtex or less, preferably 1000dtex or more and 6000dtex or less, and more preferably 2000dtex or more and 4000dtex or less, as long as the fineness of the first warp yarn 117 is larger than the fineness of the second warp yarn 117. As a result, the rigidity of the fiber reinforced substrate 111 is sufficiently reinforced, and warping of the wet paper carrying side and the end portion toward the roller side of the wet paper transfer belt 1 can be effectively suppressed.
The fineness of the second warp yarn 117 is, for example, 500dtex or more and 8000dtex or less, preferably 1000dtex or more and 6000dtex or less, and more preferably 2000dtex or more and 4000dtex or less, as long as the fineness of the second warp yarn 117 is smaller than that of the first warp yarn 115. As a result, the strength of the fiber-reinforced base material 111 and the strength of the wet paper web 1 can be sufficiently reinforced, and the warping of the end portion of the wet paper web 1 can be effectively suppressed.
The fineness of the weft yarn 119 is not particularly limited, and is, for example, 500dtex to 6000dtex, preferably 800dtex to 3000dtex, more preferably 1000dtex to 2000 dtex. As a result, the strength of the fiber-reinforced base material 111 and the strength of the wet paper web 1 can be sufficiently reinforced, and the occurrence of waviness associated with the weaving of the fiber-reinforced base material 111 can be sufficiently suppressed.
The material constituting the first warp yarn 115, the second warp yarn 117, and the weft yarn 119 is not particularly limited, and two or more kinds of polyesters (polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and the like), aliphatic polyamides (polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, and the like), aromatic polyamides (aramid), polyvinylidene fluoride, polypropylene, polyether ether ketone, polytetrafluoroethylene, polyethylene, wool, , metal, and the like may be used singly or in combination.
Any 2 or more of the first warp yarn 115, the second warp yarn 117, and the weft yarn 119 may be made of the same material, or may be made of different materials.
In the above, the first warp yarn 115 preferably contains one or more selected from the group consisting of polyester, aliphatic polyamide and aromatic polyamide (aramid), more preferably contains one or more selected from the group consisting of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610 and polyamide 612. As a result, both strength maintenance and dimensional stability can be achieved during use of the wet paper web conveyor 1.
In the above, the second warp yarn 117 preferably contains one or more of the group consisting of polyester, aliphatic polyamide and aromatic polyamide (aramid), more preferably contains one or more of the group consisting of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610 and polyamide 612. As a result, both strength maintenance and dimensional stability can be achieved during use of the wet paper web conveyor 1. Further, since polyester, particularly polyethylene terephthalate, is a material having a relatively low water absorption, when used for the second warp yarn 117, the end warpage of the wet paper web conveyor belt 1 can be more effectively suppressed as a result of the collision of the second warp yarn 117 with water being suppressed during use of the wet paper web conveyor belt 1.
In the above, the weft yarn 119 preferably includes one or more of the group consisting of polyester, aliphatic polyamide and aromatic polyamide (aramid), and more preferably includes one or more of the group consisting of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610 and polyamide 612. As a result, both strength maintenance and dimensional stability can be achieved during use of the wet paper web conveyor 1.
The first warp yarn 115, the second warp yarn 117, and the weft yarn 119 may be any type of yarn, spun yarn (spun yarn), or filament yarn. However, from the viewpoint of securing the strength of the fiber reinforced substrate 111 and the wet paper web 1, the first warp yarn 115, the second warp yarn 117, and the weft yarn 119 are each preferably filaments. The first warp yarn 115, the second warp yarn 117, and the weft yarn 119 may be different types of yarns, or may be the same type of yarns.
The filaments include, for example, multifilament yarns, monofilament twisted yarns, multifilament and/or monofilament yarn packages, and monofilament single yarns.
Wherein "multifilament" in the present specification means a filament comprising two or more single yarns. In general, a single yarn constituting a multifilament has a fineness of a yarn that cannot be used alone as a fiber-reinforced substrate. Specifically, the fineness of the single yarn constituting the multifilament is, for example, less than 100dtex, preferably 5dtex or more and 50dtex or less. And the monofilament is a filament. In general, the single yarn constituting the monofilament has a fineness of a yarn capable of being used alone as a fiber-reinforced substrate. The fineness of the filaments is, for example, 100dtex or more and 6000dtex or less, preferably 200dtex or more and 2500dtex or less.
Further, "multifilament twisted yarn" means twisted yarn using multifilament as a raw yarn. The term "multifilament yarn" refers to a yarn in which a single yarn constituting the multifilament yarn is arranged as a filament in a plurality of filaments.
When used as a companion wire for a multifilament or monofilament, the companion wire may be obtained by imparting, for example, a desired denier to the resulting filaments. In this case, the fineness of the single yarn constituting the multifilament yarn is preferably 5dtex or more and less than 100dtex, more preferably 5dtex or more and 50dtex or less. The fineness of the monofilament precursor is preferably 100dtex or more and 1000dtex or less, and more preferably 100dtex or more and 500dtex or less.
Also, when multifilament or monofilament twist is used, multi-ply or single ply twist may be used. In the case of a plurality of strands, a plurality of strands are set to, for example, 200dtex or more and 2500dtex or less, preferably 300dtex or more and 2000dtex or less, and the set strands are twisted. Furthermore, in order to achieve a desired fineness of the twisted companion yarn, a multi-strand twisted yarn of multifilament yarn or monofilament yarn may be obtained by being paired to a plurality of, for example, 2 to 10 yarns and further twisted. In this case, the number of strands for the lower twist is not particularly limited, and is, for example, 0.05 to 20.0 turns/cm, preferably 0.1 to 10.0 turns/cm. The number of the upper turns is not particularly limited, and is, for example, 0.05 to 20.0 turns/cm, preferably 0.1 to 10.0 turns/cm.
In the case of a single strand, a plurality of filaments are combined to a desired fineness, and a single twisted yarn of multifilament or monofilament can be obtained by twisting the combined filaments. In this case, the number of strands is not particularly limited, and is, for example, 0.05 to 20.0 turns/cm, preferably 0.1 to 10.0 turns/cm.
In the case of using twisted yarn, the fineness of the single yarn constituting the multifilament yarn is preferably 5dtex or more and less than 100dtex, more preferably 5dtex or more and 50dtex or less. The fineness of the monofilament precursor is preferably 200dtex or more and 1500dtex or less, and more preferably 300dtex or more and 1000dtex or less.
The first warp yarn 115, the second warp yarn 117, and the weft yarn 119 may be appropriately processed. Such a process includes a stretching process, a crimping process, and the like.
The first warp yarn 115 preferably comprises monofilaments, more preferably comprises monofilament twisted yarns, and even more preferably comprises multi-stranded twisted yarns of monofilaments, as described above.
The second warp yarn 117 preferably comprises multifilament yarn, more preferably comprises multifilament twisted yarn, further preferably comprises multifilament multi-twisted yarn in the above. When multifilament yarns are used as the second warp yarns 117, the impregnation speed of the resin material from the second side 151 can be reduced in the manufacturing process of the wet paper web 1, and the second resin layer 15 having a sufficient thickness can be formed without forming a butt fiber layer. As a result, the butt fiber layer can be omitted, and warping of the end of the wet paper web 1 can be further suppressed.
Further, the second warp yarn 117 is preferably crimped. As a result, in the process of manufacturing the wet paper web 1, the impregnation rate of the resin material from the second surface 151 side can be reduced, and the second resin layer 15 having a sufficient thickness can be formed.
Weft 119 preferably comprises monofilaments, more preferably comprises monofilament twist, and even more preferably comprises monofilament multi-strand twist. As a result, the warpage of the end portion of the wet paper web conveyor 1 during use can be more effectively suppressed.
As described above, the fiber reinforced base material 111 is a woven fabric having a double weave including the first warp yarn 115 and the second warp yarn 117 as warp yarns and the weft yarn 119 as weft yarns. The structure of the fiber reinforced substrate 111 will be described below with reference to fig. 2 to 4.
As shown in fig. 2, and as described above, in the double structure of the fiber-reinforced base material 111, the first warp yarn 115 is arranged on the first side 131 (wet paper carrying side), and the second warp yarn 117 is arranged on the opposite side of the first side, that is, on the second side 151 (roll side). Further, the weft yarn 119 is interwoven with the first warp yarn 115 and the second warp yarn 117 to form a weave pattern of the fiber reinforced substrate 111.
Specifically, as a relationship between the first warp yarns 115 and the weft yarns 119, the weft yarns 119 have a repetition of passing through the first face 131 side (1, 5, 9, 13, 17 in fig. 2) of one first warp yarn 115 and then passing through the second face 151 side (2-4, 6-8, 10-12, 14-16, 18-20 in fig. 2) of three first warp yarns 115. As a relationship between the second warp yarn 117 and the weft yarn 119, the weft yarn 119 has a repetition of passing through the first side 131 side (4 to 10, 12 to 18 in fig. 2) of 7 second warp yarns 117 and then passing through the second side 151 side (3, 11, 19 in fig. 2) of 1 second warp yarn 117. In order to simultaneously form the repeating relationship between the first warp yarn 115 and the weft yarn 119 and the repeating relationship between the second warp yarn 117 and the weft yarn 119, the overlapping structure of the fiber-reinforced base material 111 has a repeating unit R.
In the following description, a fabric structure having a repeating unit capable of simultaneously forming a repeat of passing the weft yarn through the first side of the K first warp yarns and then through the second side 151 of the L first warp yarns 115, and a repeat of passing the weft yarn through the first side of the M second warp yarns and then through the second side of the N second warp yarns is also referred to as "L/K N/M". Thus, the weave shown in FIG. 2 may be labeled as a "3/11/7" double weave.
Furthermore, the above K, L, M, N preferably satisfies the relationship of K/L.gtoreq.N/M. As a result, the density of the wet paper carrying (first surface 131) side of the woven fabric of the fiber reinforced base material 111 increases, and as a result, the rigidity of the wet paper carrying side increases. Accordingly, the fiber-reinforced base material 111 further suppresses warping of the end portion thereof toward the wet paper carrying side, thereby more effectively suppressing warping of the end portion of the wet paper conveyor belt 1 during use, and warping toward the wet paper carrying side. Further preferably K, L, M, N satisfies the relationship K/L > N/M.
Fig. 3 is a complete tissue diagram showing the relationship between the first warp yarn 115 and the weft yarn 119 of the fiber-reinforced base material 111. In its entire structure, when the fiber-reinforced base material 111 is seen in plan view from the first face 131 side, it can be seen that either one of the first warp yarn 115 and the weft yarn 119 is exposed on the first face 131 side. In fig. 3, the first warp yarn 115 is exposed on the first face 131 side in the black portion, and the weft yarn 119 is exposed on the first face 131 side in the white portion. In other words, the weft yarn 119 crosses over and turns back with the first warp yarn 115 at the white portion, forming a crossing point (knuckle portion). In the present embodiment, the number of intersections between the weft yarn 119 and the first warp yarn 115 in the whole tissue is 16.
Fig. 4 is a complete weave diagram showing the relationship between the second warp yarn 117 and the weft yarn 119 of the fiber-reinforced base material 111. In its entire structure, when the fiber-reinforced base material 111 is seen in plan view from the second face 151 side, it can be seen that either one of the second warp yarn 117 and the weft yarn 119 is exposed on the second face 151 side. In fig. 4, the second warp yarn 117 is exposed on the second side 151 in the black portion, and the weft yarn 119 is exposed on the second side 151 in the white portion. In other words, the weft yarn 119 crosses and folds back with the second warp yarn 117 at the white portion, forming a crossing point (knuckle portion). In the present embodiment, the number of intersections between the weft yarn 119 and the second warp yarn 117 in the whole weave is 8.
As such, in the present embodiment, the number of intersections between the weft yarns 119 in the complete weave and the first warp yarn 115 is greater than the number of intersections between the weft yarns 119 in the complete weave and the second warp yarn 117. As a result, the density of the wet paper carrying (first surface 131) side of the woven fabric of the fiber reinforced base material 111 increases, and as a result, the rigidity of the wet paper carrying side increases. Accordingly, the fiber-reinforced base material 111 further suppresses warping of the end portion thereof toward the wet paper carrying side, thereby more effectively suppressing warping of the end portion of the wet paper conveyor belt 1 during use, and warping toward the wet paper carrying side.
In addition to the specific woven fabric described above, the fiber reinforced base material 111 may include other woven fabric and/or other fiber material such as a mesh material in which warp and weft are overlapped without knitting. The fiber reinforced base material 111 may further include wires spirally arranged along the circumferential direction.
The fiber fineness of the fiber-reinforced base material 111 may be different depending on the location of the fiber.
The material of the resin 113 contained in the fiber-reinforced base material layer 11 is not particularly limited, and two or more kinds of thermosetting resins such as polyurethane resin, epoxy resin, acrylic resin, and the like, or thermoplastic resins such as polyamide resin, polyarylate resin, polyester resin, and the like may be used alone or in combination, and preferably polyurethane resin may be used.
The polyurethane resin used for the resin 113 is not particularly limited, and may be, for example, a polyurethane prepolymer having an isocyanate group at the end obtained by reacting a polyisocyanate compound with a polyol, and a curing agent having an active hydrogen group are cured together. Also, anionic, nonionic, cationic self-emulsifying or forced-emulsifying aqueous polyurethane resins may be used.
As described above, the polyurethane resin includes the following polyurethane resins: reacting an aqueous polyurethane resin and/or a polyisocyanate compound with a polyol to obtain a urethane prepolymer having an isocyanate group at the end, and curing the urethane prepolymer together with a curing agent having an active hydrogen group to obtain a polyurethane resin. The polyurethane resin is formed using a polyisocyanate compound, a polyol, and a curing agent as needed. Therefore, the polyisocyanate compound, the polyol and the curing agent constituting the polyurethane resin will be described below.
The polyisocyanate compounds include: the aromatic polyisocyanate compound and the aliphatic polyisocyanate compound may be used singly or in combination of two or more. Examples of the aromatic polyisocyanate compound include: 2, 4-toluene diisocyanate (2, 4-TDI), 2, 6-toluene diisocyanate (2, 6-TDI), 4' -methylenebis (phenyl isocyanate) (MDI), p-phenylene diisocyanate (PPDI), dimethylbiphenyl diisocyanate (TODI), 1, 5-Naphthalene Diisocyanate (NDI), 4-dibenzyl diisocyanate (DBDI), xylylene Diisocyanate (XDI), tetramethyl isophthalene diisocyanate (TMXDI), polymethylene polyphenyl polyisocyanate (polymeric MDI), and the like.
The aliphatic polyisocyanate compound is not particularly limited, and examples thereof include chain aliphatic polyisocyanates such as 1, 6-Hexamethylene Diisocyanate (HDI) and 1, 5-pentamethylene diisocyanate, and alicyclic polyisocyanates such as isophorone diisocyanate (IPDI), dicyclohexylmethane-4, 4' -diisocyanate (H12 MDI), 1, 3-cyclohexyl diisocyanate, 1, 4-cyclohexyl diisocyanate (CHDI) and 1, 4-bis- (isocyanatomethyl) cyclohexane (H6 XDI), and one or two or more of them may be used singly or in combination.
In the above, the polyisocyanate compound preferably contains one or more selected from the group consisting of 2, 4-toluene diisocyanate (2, 4-TDI), 2, 6-toluene diisocyanate (2, 6-TDI), 4 '-methylenebis (phenyl isocyanate) (MDI), isophorone diisocyanate (IPDI) and dicyclohexylmethane-4, 4' -diisocyanate (H12 MDI). As a result, the crack resistance, abrasion resistance, and wet paper conveyance property (balance between adhesion and peeling property between the wet paper W and the wet paper conveyance belt 1) of the wet paper conveyance belt 1 can be improved.
The polyol compound is not particularly limited, and examples thereof include: the long-chain polyol compound may be, for example, one or more of polyester polyols such as polycaprolactone polyol and polyethylene adipate, polyether polyols such as polyethylene glycol, polypropylene oxide glycol, polyhexamethylene ether glycol, polytetramethylene ether glycol (PTMG), polycarbonate polyols such as polycarbonate diol, polyether carbonate diol, trimethylolpropane, polybutadiene polyol, perfluoropolyether polyol, and silicon polyol such as silicon diol, and may be used singly or in combination.
The polycarbonate polyol is not particularly limited, and examples thereof include: a polycarbonate polyol synthesized from a polycarbonate polyol raw material polyol and a polycarbonate source. The polycarbonate polyol raw material polyol is not particularly limited, and examples thereof include: a linear or branched alkylene glycol having 2 to 20 carbon atoms, a hydroxyl group-containing cyclic hydrocarbon having 2 to 20 carbon atoms, or the like, and one or two or more of them may be used singly or in combination. Examples of the linear alkylene glycol include: ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, heptylene glycol, octylene glycol, nonylene glycol, decylene glycol, undecylene glycol, dodecylene glycol, and the like. Examples of the branched alkylene glycol include: 2-methyl-1, 3-propanediol, 2-dimethyl-1, 3-propanediol, 3-methyl-1, 5-pentanediol, 2-methyl-1, 8-octanediol, and the like. Examples of the hydroxyl group-containing cyclic hydrocarbon include: hydroxyl group-containing alicyclic alkanes such as 1, 3-cyclohexanediol, 1, 4-cyclohexanediol, and 1, 4-cyclohexanedimethanol.
In the above, the polyol compound preferably contains one or more selected from the group consisting of polyether polyol, polycarbonate polyol, and polyether carbonate diol, more preferably contains one or more selected from the group consisting of polytetramethylene ether glycol (PTMG) and polycarbonate polyol synthesized from a polycarbonate source. As a result, the crack resistance, abrasion resistance, and wet paper conveyance property (balance between adhesion and peeling property between the wet paper W and the wet paper conveyance belt 1) of the wet paper conveyance belt 1 can be improved.
The curing agent having an active hydrogen group is not particularly limited, and one or more compounds selected from the group consisting of polyol compounds and polyamines can be used.
As the polyol compound which can be contained in the curing agent, various aliphatic polyol compounds and various alicyclic or aromatic polyol compounds can be used in addition to the above-mentioned long-chain polyol compounds.
The aliphatic polyol compound is not particularly limited, and examples thereof include: ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1, 2-propanediol, 1, 3-propanediol, dipropylene glycol, tripropylene glycol, 1, 2-butanediol, 1, 3-butanediol, 1, 4-butanediol, 2, 3-butanediol, 1, 5-pentanediol, 1, 5-hexanediol, 1, 6-hexanediol, 2, 5-hexanediol, 1, 7-heptanediol, 1, 8-octanediol, 1, 9-nonanediol, 1, 10-decanediol, 1, 11-undecanediol, 1, 12-dodecanediol, 1, 13-tridecanediol, 1, 14-tetradecanediol, 1, 16-hexadecanediol, 1, 18-octadecanediol, 1, 20-eicosanediol, 2-methyl-1, 3-propanediol, neopentyl glycol, 2-butyl-2-ethyl-1, 3-propanediol, 3-methyl-1, 5-pentanediol, 2-ethyl-1, 3-hexanediol, 2-methyl-1, 8-octanediol, and the like alkylene glycol compounds; and glycerol, ditrimethylolpropane, trimethylolpropane (TMP), pentaerythritol, dihydroxymethylpropionic acid (DHPA), and the like.
The alicyclic polyol compound is not particularly limited, and examples thereof include: 1, 4-cyclohexanedimethanol, hydrogenated bisphenol A, and the like.
The aromatic polyol compound is not particularly limited, and examples thereof include: hydroquinone-bis (. Beta. -hydroxyethyl) ether, hydroquinone dihydroxyethyl ether (HQEE), resorcinol bis (2-Hydroxyethyl) Ether (HER), 1, 3-bis (2-hydroxyethoxybenzene), 1, 4-bis (2-hydroxyethoxybenzene), bisphenol A, alkylene oxide adducts of bisphenol A, bisphenol S, alkylene oxide adducts of bisphenol S, and the like.
The polyamine is not particularly limited, and examples thereof include: hydrazine, ethylenediamine, 4' -methylenebis (2-chloroaniline) (MOCA), dimethylthiotoluenediamine (DMTDA), diethyltoluenediamine (DETDA), trimethylene glycol bis (p-aminobenzoate) (TMAB), 4' -methylene-bis- (3-chloro-2, 6-diethylaniline) (MCDEA), 4' -methylene-bis- (2, 6-diethylaniline) (MDEA), triisopropanolamine (TIPA), p-bis (aminocyclohexyl) methane (PACM), naphthalene-1, 5-diamine, xylenediamine, phenylenediamine, toluene-2, 4-diamine, t-butyltoluenediamine, 1, 2-bis (2-aminophenylthioethane), 2- (2-aminoethylamino) ethanol, and the like.
In the above, the curing agent preferably contains one or more selected from the group consisting of aliphatic polyol compounds and polyamines, more preferably contains one or more selected from the group consisting of ethylene glycol, butylene glycol, trimethylolpropane (TMP), dimethylthiotoluenediamine (DMTDA), and diethyltoluenediamine (DETDA). As a result, the crack resistance, abrasion resistance, and wet paper conveyance property (balance between adhesion and peeling property between the wet paper W and the wet paper conveyance belt 1) of the wet paper conveyance belt 1 can be improved.
The resin 113 of the fiber reinforced substrate layer 11 may be crosslinked by a crosslinking agent. Examples of the crosslinking agent include various crosslinking agents such as carbodiimides, melamine compounds, epoxy compounds, and isocyanates, and one or two or more of these crosslinking agents may be used alone or in combination. The crosslinking agent may be a crosslinking agent composition containing a solvent, a dispersant, a surfactant, or the like, or may be (for example, a solution, a dispersion, or an emulsion). When the crosslinking agent is in the form of a solution, the crosslinking agent may be an aqueous solution.
The crosslinking agent may be used in combination with a material for constituting the polyurethane resin, such as a polyurethane prepolymer and a curing agent, or may be used in combination with a dispersion of an aqueous polyurethane resin.
The resin 113 may contain one or more inorganic fillers such as titanium oxide, kaolin, clay, talc, diatomaceous earth, calcium carbonate, calcium silicate, magnesium silicate, silica, and mica.
The composition and type of the resin 113 in the fiber-reinforced base material layer 11 may be different or the same for each part in the fiber-reinforced base material layer 11.
The first resin layer 13 is a layer containing a resin as a main component provided on one main surface of the fiber-reinforced base material layer 11.
The first resin layer 13 forms a first surface 131 on which the wet paper W is disposed on a main surface opposite to the main surface bonded to the fiber-reinforced base material layer 11. That is, the wet paper conveyance belt 1 can convey the wet paper W while supporting the wet paper W on the first surface 131 of the first resin layer 13. In the illustrated embodiment, the wet paper W is directly disposed on the first surface 131. However, the wet paper W may be indirectly disposed on the first surface 131. For example, according to the usage mode, another device such as felt is placed between the first surface 131 and the wet paper W, and the wet paper W is placed on the first surface 131 by the other device.
The resin material constituting the first resin layer 13 is not particularly limited, and for example, two or more kinds of resins which can be used in the resin 113 of the fiber-reinforced base material layer 11 may be used singly or in combination. The resin constituting the first resin layer 13 may be the same as or different from the resin 113 of the fiber reinforced base material layer 11 in kind and composition.
The resin constituting the first resin layer 13 may contain one or more inorganic fillers such as titanium oxide, kaolin, clay, talc, diatomaceous earth, calcium carbonate, calcium silicate, magnesium silicate, silica, and mica. By including such an inorganic filler in the resin constituting the first resin layer 13, the surface state of the first surface 131 such as the uneven state, the surface roughness, and the hydrophilicity of the first surface 131 of the first resin layer 13 can be further controlled, and the conveyance function (wet paper adhesion) in a state of adhering the wet paper W required in the wet paper conveyance belt 1 and the function (wet paper peelability) of smoothly separating the wet paper W when the wet paper W is directed to the subsequent stage can be reliably achieved.
On the other hand, during use of the wet paper web conveyor 1, the inorganic filler is less likely to absorb moisture than other portions constituting the wet paper web conveyor 1, and tends to cause warpage of the end portions of the wet paper web conveyor 1. However, in the present embodiment, by providing the wet paper web conveyor belt 1 with the fiber reinforced base material 111 described above, even when an inorganic filler is used, warping of the end portion of the wet paper web conveyor belt 1 can be sufficiently suppressed.
Also, the first resin layer 13 preferably has a water-impermeable property. That is, the first resin layer 13 is preferably impermeable to water.
The second resin layer (roll surface side resin layer) 15 is a layer containing a resin as a main component provided on one main surface of the fiber-reinforced base material layer 11.
The second resin layer 15 forms a second surface 151 for contact with a roller described below on a main surface opposite to the main surface bonded to the fiber-reinforced base material layer 11. In use, the wet paper transfer belt 1 may obtain power for transferring the wet paper from the rollers by bringing the second face 151 into contact with the rollers. The second surface 151 may be provided with irregularities by disposing the second warp threads 117 on the second surface 151, and as a result, the wet paper web 1 and the roller can be prevented from slipping.
The resins constituting the second resin layer 15 may be used alone or in combination of resin materials that can be used for the first resin layer 13 as described above. The resin constituting the second resin layer 15 may be the same as or different from the resin constituting the first resin layer 13 or the resin 113 constituting the fiber-reinforced base material layer 11 in kind and composition.
Also, the second resin layer 15 may contain one or two or more inorganic fillers, similarly to the first resin layer 13.
The composition and type of the resin material and the inorganic filler in the second resin layer 15 may be different or the same for each part in the second resin layer 15.
The size of the wet paper web conveyor 1 is not particularly limited and may be appropriately set according to the application.
For example, the width of the wet paper web conveyor 1 is not particularly limited, and may be 700 to 13500mm, preferably 2500 to 12500mm.
Further, for example, the length (circumferential length) of the wet paper web conveyor 1 is not particularly limited, and may be 4 to 35m, preferably 10 to 30m.
The thickness of the wet paper web conveyor 1 is not particularly limited, and may be, for example, 1.5 to 7.0mm, and preferably 2.0 to 6.0mm.
The thickness of each part of the wet paper web conveyor 1 may be different or the same.
The wet paper transfer belt 1 described above can be manufactured by, for example, the method for manufacturing the wet paper transfer belt according to the present embodiment described below.
As described above, in the wet paper web conveyor belt 1 of the present embodiment, the fiber reinforced base material 111 includes the woven fabric having the double weave, and the fineness of the first warp yarn 115 in the woven fabric is larger than the fineness of the second warp yarn 117. As a result, warpage of the end portion, i.e., the width direction (CMD) end portion, of the wet paper conveyance belt 1 during use is suppressed. As a result, the automatic guide device can more accurately detect the position of the wet paper conveyance belt 1 and more appropriately control the position of the wet paper conveyance belt 1. Such a wet paper transfer belt 1 can be used stably.
< 2. Modification >
Next, several modifications of the papermaking belt according to the above embodiment will be described. Hereinafter, differences from the above-described embodiments will be collectively described, and description of the same will be omitted. Further, the features of the modification examples and the above embodiments described below may be applied separately, but two or more kinds may be applied in combination as technically permitted.
(2.1. First modification)
Fig. 5 is an enlarged cross-sectional view of a fiber-reinforced base material of the wet paper transfer belt (papermaking belt) according to the first modification, and fig. 6 and 7 are complete weave diagrams of a woven fabric of the fiber-reinforced base material of the wet paper transfer belt of fig. 5.
The wet paper transfer belt 1A of the first modification is different from the above embodiment in that it has a fiber-reinforced base material 111A as shown in fig. 5 to 7 instead of the fiber-reinforced base material 111 in the above embodiment, and is otherwise substantially the same. The fiber reinforced base material 111A will be described below.
The fiber reinforced base material 111A is a woven fabric having a double weave, and has a first warp 115A, a second warp 117A, and a weft 119A. In the double structure of the fiber-reinforced base material 111A, the first warp yarn 115A is disposed on a first surface side (wet paper carrying side, not shown), and the second warp yarn 117A is disposed on a second surface side (roll side, not shown) opposite to the first surface side. The first warp yarn 115A, i.e., the second warp yarn 117A, is arranged in parallel. The first warp yarn 115A, i.e., the second warp yarn 117A, is arranged along the Machine Direction (MD). On the other hand, the weft yarn 119A is disposed substantially perpendicular to the first warp yarn 115A and the second warp yarn 117A, i.e., along the machine cross direction (CMD). Weft yarn 119A is interwoven with first warp yarn 115A and second warp yarn 117A.
Specifically, as a relationship between the first warp yarn 115A and the weft yarn 119A, the weft yarn 119A has a repetition of passing through the first face sides (1, 5, 9, 13, 17 in fig. 5) of one first warp yarn 115A and then passing through the second face sides (2-4, 6-8, 10-12, 14-16 in fig. 5) of three first warp yarns 115A. Further, as a relationship between the second warp yarn 117A and the weft yarn 119A, the weft yarn 119A has a repetition of passing through the first face side (4-6, 8-10, 12-14, 16-18 in fig. 5) of three second warp yarns 117A followed by the second face side (3, 7, 11, 15 in fig. 5) of one first warp yarn 115A. In order to simultaneously form the repeating relationship between the first warp yarn 115A and the weft yarn 119A and the repeating relationship between the second warp yarn 117A and the weft yarn 119A, the overlapping structure of the fiber-reinforced base material 111A has a repeating unit R'. The weave of the fiber reinforced substrate 111 shown in fig. 5 described above may be labeled as a double weave of "3/1 1/3".
Fig. 6 is a complete tissue diagram showing the relationship between the first warp yarn 115A and the weft yarn 119A of the fiber-reinforced base material 111A. In its complete tissue diagram, when the fiber reinforced base material 111A is seen in plan view from the first face side, it can be observed that either one of the first warp yarn 115A and the weft yarn 119A is exposed on the first face side. In fig. 6, the first warp yarn 115A is exposed on the first face side in the black portion, and the weft yarn 119A is exposed on the first face side in the white portion. In other words, the weft yarn 119A crosses and folds back with the first warp yarn 115A at the white portion, forming a crossing point (knuckle portion). In the present modification, the number of intersections between the weft yarn 119A and the first warp yarn 115A in the whole tissue is 4.
Fig. 7 is a complete weave diagram showing the relationship between the second warp yarn 117A and the weft yarn 119A of the fiber-reinforced base material 111A. In its complete weave diagram, when the fiber reinforced base material 111A is seen in plan view from the second face side, it can be observed that either one of the second warp yarn 117A and the weft yarn 119A is exposed on the second face side. In fig. 7, the second warp yarn 117A is exposed on the second face side in the black portion, and the weft yarn 119A is exposed on the second face side in the white portion. In other words, the weft yarn 119A crosses and folds back with the second warp yarn at the white portion, forming a crossing point (knuckle portion). In the present modification, the number of intersections between the weft yarn 119A and the second warp yarn 117A in the whole structure is 4.
In the wet paper transfer belt 1A described above, the fineness of the first warp yarn 115A is larger than that of the second warp yarn 117A. As a result, the same effects as those of the above embodiment are obtained.
(2.2. Second modification)
Fig. 8 is a machine-cross-sectional view of a wet paper transfer belt (papermaking belt) of a second modification. The wet paper transfer belt 1B of the second modification differs from the above-described embodiment in that it has a first resin layer 13B in which a resin material is impregnated into a butt fiber and a second resin layer 15B in which a resin material is impregnated into a butt fiber, instead of the first resin layer 13 and the second resin layer 15 in the above-described embodiment.
The first resin layer 13B is obtained by impregnating a resin material into the butt-joint fiber layer formed on the fiber-reinforced base material layer 11B. Accordingly, the first resin layer 13B contains the butt fibers and the resin as a matrix. As the resin material of the first resin layer 13B, the same material as that of the first resin layer 13 in the above-described embodiment can be used. As the material of the butt fibers, two or more materials that can be used for the fiber reinforced base material 111 in the above embodiment may be used alone or in combination.
The second resin layer 15B is obtained by impregnating a resin material into the butt-joint fiber layer formed on the fiber-reinforced base material layer 11B. Accordingly, the second resin layer 15B contains the butt fibers and the resin as a matrix. As the resin material of the second resin layer 15B, the same material as that of the first resin layer 13 in the above-described embodiment can be used. As the material of the butt fibers, two or more materials that can be used for the fiber reinforced base material 111 in the above embodiment may be used alone or in combination.
Further, as the first resin layer 13B and the second resin layer 15B are formed on both surfaces of the fiber-reinforced base material layer 11B, butt fiber layers are arranged. The butt-joint fiber layer is formed by disposing butt-joint fibers on both sides of the fiber-reinforced base material layer 11B and entangling the butt-joint fibers with the fiber-reinforced base material layer 11B by needling. Therefore, although not shown, the butt fibers are entangled with the fiber-reinforced base material 111B of the fiber-reinforced base material layer 11B. The other composition of the fiber reinforced base material layer 11B is the same as that of the fiber reinforced base material 111 of the above embodiment.
As described above, in the present modification, the first resin layer 13B and the second resin layer 15B include not only the resin but also the butt fibers. In this way, when the first resin layer 13B and the second resin layer 15B include the butt fibers, appropriate irregularities are generated in the first surface 131B of the first resin layer 13B and the second surface 151B of the second resin layer 15B. As a result, the adhesion and peelability of the wet paper W on the first surface 131B can be more easily controlled. Further, a sufficient frictional force with the contacted roller can be obtained in the second surface 151B, and the power from the roller can be more effectively transmitted to the wet paper web conveyor 1. Further, the second surface 151B may be provided with the butt fibers to form irregularities on the second surface 151B. As a result, a so-called slipping phenomenon in which the wet paper feed belt 1B and the rollers slip can be prevented.
Further, when the resin material is applied during the formation of the first resin layer 13B and the second resin layer 15B, the impregnation rate of the resin material into the butt fibers and the fiber reinforced base material layer 11B becomes smaller than that in the case where the butt fibers are not present. As a result, the thicknesses of the first resin layer 13B and the second resin layer 15B can be made sufficient, and the durability and strength of the wet paper web 1 can be made sufficient.
On the other hand, when the resin layer contains the butt fibers like the first resin layer 13B and the second resin layer 15B, the butt fibers absorb moisture and expand, and generally tend to be easily warped at the end of the wet paper conveyance belt. However, the wet paper conveyor belt 1B is provided with the fiber reinforced base material layer 11B as described above, whereby warping of the end portion of the wet paper conveyor belt 1B is suppressed.
(2.3. Another modification thereof)
In the above embodiment, the woven fabric included in the fiber reinforced substrate layer 11 has a double structure, but the present invention is not limited to this, and may have a triple or more overlapped structure. In this case, any two parallel warps or wefts in the overlapping weave of the woven fabric may have the above-mentioned fineness relationship. Preferably, in the parallel warp or weft of the overlapping weave of the woven cloth, the titer of the thread closest to the first side (wet paper carrying side) is larger than the titer of the thread closest to the second side (roll side).
In the above embodiment, the first warp yarn 115 and the second warp yarn 117 of the woven fabric included in the fiber reinforced base material layer 11 have the above-described fineness relationship, but the present invention is not limited to this, and the woven fabric included in the fiber reinforced base material layer is a weft multiple woven fabric, and the fineness of the weft yarn on the first side (wet paper carrying side) may be larger than that of the weft yarn on the second side (roll side) among two parallel weft yarns.
In the second modification, the first resin layer 13B and the second resin layer 15B including the butt fibers are formed on both sides of the fiber-reinforced base material layer 11B, but the present invention is not limited to this, and the resin layer including the butt fibers may be formed on only one side of the fiber-reinforced base material layer.
< 4 method of making papermaking belt >
Next, several examples of preferred embodiments of the above-described method for producing a papermaking belt according to the present invention will be described. In this embodiment, a method for producing the wet paper web 1 will be representatively described as an example of the papermaking belt. The wet paper web 1 can be manufactured by any method. Hereinafter, as a method for producing the wet paper web 1, a back-side coating reverse production method and a front-side coating infiltration production method will be described.
First, a back-side coating reverse manufacturing method will be described with reference to fig. 9 and 10. Figures 9 and 10 are schematic views for explaining a preferred embodiment of the method of making a papermaking belt of the present invention. First, as shown in fig. 9, the annular fiber-reinforced base material 111 is put in contact with two rollers 21 arranged in parallel. At this time, the fiber reinforced base material 111 is disposed such that the first warp 115 of the fiber reinforced base material 111 contacts the roller 21. Next, the resin material for forming the second resin layer 15 is discharged from the side where the second warp 117 of the fiber reinforced substrate 111 is disposed, that is, from the outside of the fiber reinforced substrate 111 currently being put in, to the surface of the fiber reinforced substrate 111 through the resin discharge port 25 of the coater while rotating the roller 21, and the resin material is applied using the application bar 23. Next, the coated resin material is cured by heating, forming the second resin layer 15.
Next, as shown in fig. 10, the fiber-reinforced substrate 111 is turned over and put in such a manner that the formed second resin layer 15 is in contact with the roller 21. Thereafter, the resin 113 of the fiber reinforced base material layer 11 and the resin material constituting the resin of the first resin layer 13 are discharged to the surface of the fiber reinforced base material 111 through the resin discharge port 25 of the coater, and the resin material is coated with the coating rod 23. As a result, the precursor of the first resin layer 13 is formed on the fiber-reinforced base material 111 while the resin material is impregnated into the fiber-reinforced base material 111 to constitute the resin 113. Then, the resin laminate including the obtained fiber-reinforced base material 111 is heat-cured, and the wet paper web 1 in which the first resin layer 13, the fiber-reinforced base material layer 11, and the second resin layer 15 are sequentially laminated is obtained. Further, the first surface 131 of the first resin layer 13 and/or the second surface 151 of the second resin layer 15 may be polished by a polishing device, if necessary.
Next, a surface coating infiltration manufacturing method will be described with reference to fig. 11 and 12. Figures 11 and 12 are schematic views for explaining a preferred embodiment of the method of making a papermaking belt of the present invention. First, as shown in fig. 11, the annular fiber reinforced substrate 111 is put in contact with two rollers 21 arranged in parallel. At this time, the fiber-reinforced base material 111 is disposed such that the second warp 117 of the fiber-reinforced base material 111 contacts the roller 21. Next, while rotating the roller, the resin material is discharged from the side where the first warp 115 of the fiber reinforced base material 111 is disposed, that is, from the outside of the fiber reinforced base material 111 currently being put in, to the surface of the fiber reinforced base material 111 through the resin discharge port 25 of the coater, and the resin material is coated using the coating rod 23. The resin material applied at this time may penetrate the fiber reinforced substrate 111. Therefore, in the present embodiment, not only the resin 113 included in the fiber reinforced base material 111 but also the resin constituting the second resin layer 15 may be formed, and the fiber reinforced base material layer 11 and the second resin layer 15 may be formed at the same time.
Next, as shown in fig. 12, the resin material of the first resin layer 13 is coated on the outer surface of the formed fiber-reinforced base material layer 11. Specifically, the resin material is discharged from the resin discharge port 25 while rotating the fiber-reinforced base material layer 11 and the second resin layer 15 formed by the roller 21, and the resin material is applied to the outer surface of the fiber-reinforced base material layer 11. The resin material simultaneously coated is uniformly coated by using the coating bar 23. The resin material constituting each layer may be a material coated as a mixture with the inorganic filler.
Next, the coated resin material is dried and cured. As a result, the wet paper conveyor belt 1 in which the first resin layer 13, the fiber reinforced base material layer 11, and the second resin layer 15 are laminated in this order from the outer surface is obtained. Further, the first surface 131 of the first resin layer 13 and/or the second surface 151 of the second resin layer 15 may be polished by a polishing device, if necessary.
The present invention has been described in detail based on the preferred embodiments, but the present invention is not limited to this, and each composition may be replaced by any composition capable of exhibiting the same function, or any other composition may be added.
In the above description, the wet paper web is used as an example of the papermaking belt, but the present invention is not limited thereto. For example, the papermaking belt of the present invention may be a shoe press belt, as well as other papermaking belts.
[ example ]
Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
1. Manufacturing of wet paper conveyor belt
Example 1
The wet paper conveyor belt of example 1 below was manufactured by a surface coating infiltration manufacturing method.
(i) Preparation of fiber-reinforced substrates
First, a woven fabric having a warp double structure having the following structure was prepared as a fiber reinforced base material.
First warp: 3810dtex monofilament twist made of polyamide 6
( 2 filaments of polyamide 6 of 370dtex were twisted and 5 filaments were twisted. The lower twist is 2.1 turns/cm, and the upper twist is 1.2 turns/cm. )
Second warp: 3333dtex multifilament twisted yarn made of polyamide 6
( 68 filaments of polyamide 6 of 22.1dtex were arranged and twisted 2. The lower twist is 0.7 turns/cm, and the upper twist is 0.7 turns/cm. )
Weft yarn: 1582dtex monofilament twisted yarn made of polyamide 610
( 2 filaments of polyamide 610 of 370dtex were twisted and 2 were twisted. The lower twist is 3.1 turns/cm, and the upper twist is 2.2 turns/cm. )
Organization: 35 upper and lower warps/5 cm, 40 wefts/5 cm, warp double weave (3/1 1/7, equivalent to the weave of FIGS. 2-4)
(ii) Formation of laminate
First, the prepared annular fiber-reinforced substrate was put on 2 rolls arranged in parallel. At this time, the fiber-reinforced substrate is put on the roller in such a manner that the second warp of the fiber-reinforced substrate contacts the roller. The polyurethane composition is coated on the surface of the first warp yarn of the exposed fiber-reinforced substrate while rotating the roller. As the polyurethane composition, a mixture of a polyurethane prepolymer obtained by reacting a mixture of 2, 4-toluene diisocyanate (2, 4-TDI) and 2, 6-toluene diisocyanate (2, 6-TDI) with polytetramethylene ether glycol (PTMG) and dimethyl thiotoluene diamine (DMTDA) as a curing agent was used.
When the polyurethane composition is applied, the polyurethane composition penetrates the fiber-reinforced substrate while impregnating the fiber-reinforced substrate, and simultaneously forms a fiber-reinforced substrate layer and a second resin layer on the roll side. Next, the polyurethane composition of the first resin layer on the carrying side of each wet paper was coated on the outer surface of the fiber-reinforced base material layer formed, and the first resin layer was laminated. And heating and drying the laminated body sequentially forming the first resin layer, the fiber reinforced substrate layer and the second resin layer from the outermost layer to obtain a semi-finished product of the wet paper conveying belt.
(iii) Grinding and polishing
The polishing sheets #80 to #600 were appropriately set on the wet paper carrying side surface of the wet paper conveyor (semi-finished product) and polished by a polishing apparatus. And, in order to adjust the surface roughness of the wet paper contact surface, an appropriate polishing process is performed so that the arithmetic average roughness of the wet paper bearing surface of the wet paper conveying belt of each example is 0.3 to 20 μm. Through the above procedure, the wet paper conveyance belt of example 1 was completed.
The wet paper transfer belt was manufactured to have a length of 20m and a width of 700mm.
Example 2
A wet paper transfer belt of example 2 was produced in the same manner as in example 1, except that the fiber-reinforced base material was changed as follows.
The fiber-reinforced base material used in example 2 used the same first warp yarn, second warp yarn and weft yarn as the fiber-reinforced base material used in example 1, but had a warp yarn double structure (3/1 1/3, corresponding to the structure of fig. 5 to 7) as the fabric structure.
Example 3
A wet paper transfer belt of example 3 was produced in the same manner as in example 1, except that the fiber-reinforced base material was changed as follows.
The fiber reinforced base material used in example 3 uses the same first warp yarn, second warp yarn and weave pattern as the fiber reinforced base material used in example 1, and on the other hand, the following is used as the weft yarn.
Weft yarn: 1059dtex monofilament single yarn made of polyamide 610
Example 4
A wet paper transfer belt of example 4 was produced in the same manner as in example 2, except that the butt fibers were needled to both sides of the fiber-reinforced base material to form a butt fiber layer.
In example 4, a short fiber having a cut length of 76mm and 22dtex composed of polyamide 66 was used as a butt fiber to form a butt fiber layer such that the basis weight of the side where the first resin layer was formed (wet paper carrying side) was 100g/m 2 The basis weight of the side (roll side) on which the second resin layer was formed was 100g/m 2 。
Comparative example 1
A wet paper transfer belt of comparative example 1 was produced in the same manner as in example 4, except that the fiber reinforced base material was changed as follows.
First warp yarn and second warp yarn: 2271dtex monofilament twist of polyamide 6
( 2 filaments of polyamide 6 of 370dtex were twisted and 3 filaments were twisted. The lower twist is 2.7 turns/cm, and the upper twist is 2.1 turns/cm. )
Weft yarn: 1582dtex monofilament twisted yarn made of polyamide 610
( 2 filaments of polyamide 610 of 370dtex were twisted and 2 filaments were twisted. The lower twist is 3.1 turns/cm, and the upper twist is 2.2 turns/cm. )
Organization: 35 upper and lower warps/5 cm, 40 wefts/5 cm, warp double weave (3/1 1/3, equivalent to the weave of FIGS. 5-7)
2. Evaluation
The occurrence of warpage of the end portions of the produced wet paper conveyor belts of examples 1 to 4 and comparative example 1 was evaluated according to the following procedure.
First, test pieces S having a length of 3.2m and a width of 22cm were cut out from the wet paper conveyors of examples 1 to 4 and comparative example 1. Then, each of the test pieces S of examples 1 to 4 and comparative example 1 was immersed in water at room temperature of 20.+ -. 2 ℃ and humidity of 50.+ -. 10% for 24 hours.
Next, the longitudinal ends of the test pieces S of examples 1 to 4 and comparative example 1 were formed into a ring shape with a suture thread. Then, as shown in fig. 13, each test piece S was put on 2 parallel rollers 30. Subsequently, the roller 30 was rotated, and the test piece S was rotated 2 turns at a toxin dispensing speed of 4 m/min, and water 41 was sprayed onto the surface of the test piece by the sprayer 40.
After the sprinkling, the tension applied to the test piece S was adjusted to 5kN/m, and then the roller 30 was stopped. Then, as shown in fig. 14, the second resin layer side of the test piece S is brought into contact with the metal scale 50, the metal scale 50 is horizontally adjusted, and the distance between the metal scale 50 and the part of the test piece S farthest from the metal scale 50 is measured as the ear rolling amount D 1 、D 2 . In the test piece S, the end portion may warp toward the roller side, that is, the metal scale 50 side. In this case, the distance between the highest position near the center in the width direction of the test piece S and the metal scale 50 is measured as the ear amount. The ear pick-up amount at 4 points was measured, and the average value thereof was used as the ear pick-up amount of the test piece S.
The results of the above evaluation are shown in table 1 together with the structures of the fiber-reinforced substrates of examples 1 to 4 and comparative example 1.
TABLE 1
/>
As shown in table 1, the wet paper transfer belts of examples 1 to 4 have a smaller curl amount than the wet paper transfer belt of comparative example 1, and the end warpage is suppressed. In the above evaluation, the test piece S having a width of 22cm was used, but the wet paper transfer belt placed on the actual paper machine had a width of several meters, and the end warpage was increased substantially in proportion to this.
In the case of comparing examples 1 and 2 with example 3, the wet paper transfer belts of examples 1 and 2 using the monofilament twist as the weft had a smaller curl amount than that of example 3 using the monofilament single yarn.
Also, when comparing example 1 with example 2, the wet paper transfer belt of example 1 using a fiber-reinforced substrate having a fabric structure of 3/1 1/7 had a smaller curl amount than that of example 2 using a fiber-reinforced substrate having a fabric structure of 3/1 1/3.
Description of the reference numerals
1. 1A, 1B: wet paper conveyer belt (paper making belt)
11. 11B: fiber reinforced substrate layer
111. 111A, 111B: fiber reinforced substrate
113: resin composition
115. 115A: first warp yarn
117. 117A: second warp yarn
119. 119A: weft yarn
13. 13B: a first resin layer
131. 131B: first side (Wet paper contact surface)
151. 151B: second resin layer (roller contact surface)
Claims (10)
1. A papermaking belt for a papermaking machine having a first side on which wet paper is disposed and a second side opposite the first side, characterized in that,
has a fiber-reinforced substrate layer comprising at least one woven fabric,
at least one layer of the woven cloth has overlapping tissues with more than two layers,
the overlapping tissue has a first thread and a second thread arranged in parallel,
The first wire is disposed closer to the first face than the second wire, the second wire is disposed closer to the second face than the first wire,
the titer of the first thread is greater than the titer of the second thread.
2. The papermaking belt of claim 1, wherein said second strand is crimped.
3. The papermaking belt of claim 1, wherein said second strand is a multifilament twisted strand.
4. The papermaking belt of claim 1, wherein said first and second strands are disposed along a machine direction of the belt.
5. The papermaking belt of claim 1, characterised in that it is devoid of a ply of butt fibres.
6. The belt as in claim 1, wherein,
the fabric having the overlapping weave further has a third thread interwoven with the first and second threads,
the third thread is a monofilament twisted thread.
7. The belt as in claim 1, wherein,
the fabric having the overlapping weave further has a third thread interwoven with the first and second threads,
the overlapping tissue is a tissue having a repeating unit capable of simultaneously forming a repeat of making the third thread pass through the L second face sides of the first thread while passing through the K first face sides of the first thread, and a repeat of making the third thread pass through the N second face sides of the second thread while passing through the M first face sides of the second thread,
Satisfies the relation that K/L is larger than or equal to N/M.
8. The belt as in claim 1, wherein,
the fabric having the overlapping weave further has a third thread interwoven with the first and second threads,
the number of intersections of the first line with the third line in the intact tissue is greater than the number of intersections of the second line with the third line in the intact tissue.
9. The papermaking belt of claim 1, wherein the belt is a wet paper conveyor belt.
10. The papermaking belt of claim 1, characterised in that it is a shoe press belt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022138602A JP2024034395A (en) | 2022-08-31 | 2022-08-31 | paper making belt |
| JP2022-138602 | 2022-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117626700A true CN117626700A (en) | 2024-03-01 |
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ID=87760663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310950823.XA Pending CN117626700A (en) | 2022-08-31 | 2023-07-31 | Papermaking belt |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20240068167A1 (en) |
| EP (1) | EP4343058A3 (en) |
| JP (1) | JP2024034395A (en) |
| CN (1) | CN117626700A (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5298124A (en) * | 1992-06-11 | 1994-03-29 | Albany International Corp. | Transfer belt in a press nip closed draw transfer |
| US6103067A (en) * | 1998-04-07 | 2000-08-15 | The Procter & Gamble Company | Papermaking belt providing improved drying efficiency for cellulosic fibrous structures |
| GB0204310D0 (en) | 2002-02-23 | 2002-04-10 | Voith Fabrics Heidenheim Gmbh | Edge balanced belt |
| US7059360B1 (en) * | 2005-03-03 | 2006-06-13 | Albany International Corp. | Double layer forming fabric with paired warp binder yarns |
| EP3511455A4 (en) * | 2016-09-06 | 2020-04-29 | Nippon Filcon Co., Ltd | Industrial two-layer woven fabric |
-
2022
- 2022-08-31 JP JP2022138602A patent/JP2024034395A/en active Pending
-
2023
- 2023-07-31 CN CN202310950823.XA patent/CN117626700A/en active Pending
- 2023-08-21 EP EP23192382.2A patent/EP4343058A3/en active Pending
- 2023-08-21 US US18/452,670 patent/US20240068167A1/en active Pending
Also Published As
| Publication number | Publication date |
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| US20240068167A1 (en) | 2024-02-29 |
| EP4343058A3 (en) | 2024-05-01 |
| JP2024034395A (en) | 2024-03-13 |
| EP4343058A2 (en) | 2024-03-27 |
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