WO2022210020A1 - 無機繊維シート - Google Patents
無機繊維シート Download PDFInfo
- Publication number
- WO2022210020A1 WO2022210020A1 PCT/JP2022/012590 JP2022012590W WO2022210020A1 WO 2022210020 A1 WO2022210020 A1 WO 2022210020A1 JP 2022012590 W JP2022012590 W JP 2022012590W WO 2022210020 A1 WO2022210020 A1 WO 2022210020A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fiber sheet
- inorganic fiber
- inorganic
- sheet
- per unit
- Prior art date
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- 239000012784 inorganic fiber Substances 0.000 title claims abstract description 126
- 239000000835 fiber Substances 0.000 claims description 43
- 239000004745 nonwoven fabric Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000004744 fabric Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 14
- 239000002994 raw material Substances 0.000 description 13
- 239000007788 liquid Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000011490 mineral wool Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000013039 cover film Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000002612 dispersion medium Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000013054 paper strength agent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
- D04H1/43838—Ultrafine fibres, e.g. microfibres
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/04—Arrangements using dry fillers, e.g. using slag wool which is added to the object to be insulated by pouring, spreading, spraying or the like
Definitions
- the present invention relates to inorganic fiber sheets.
- inorganic fiber sheets such as rock wool paper and AES (alkaline earth silicate) paper are widely used as heat insulating materials and heat insulating materials.
- inorganic fiber sheets are made from inorganic fibers, but particles called shot are always formed at the ends of such inorganic fibers during the fiber manufacturing process.
- this shot-attached fiber is made into paper by a conventional method, the shot tends to be localized near the surface of the fiber sheet.
- a coating agent such as a pressure-sensitive adhesive or adhesive is applied to the surface of the fiber sheet, the shot falls off together with the coating agent due to impact or the like, which is desirable. There was a problem that tackiness or adhesiveness could not be obtained.
- Patent Document 1 proposes to separate the shot in the manufacturing process to reduce the concentration of the shot itself in the papermaking sheet. Further, Patent Document 2 proposes a method of centrifuging a paper raw material liquid in which inorganic fibers are dispersed and passing it through a screen filter or the like to reduce the concentration of shot.
- an object of the present invention is to provide an inorganic fiber sheet that has high workability, etc., and is also excellent in adhesiveness or adhesiveness when a pressure-sensitive adhesive or adhesive is applied.
- the inorganic fiber sheets according to Patent Document 1 and Patent Document 2 both require a process for removing shot from the inorganic fibers, which has the problem of lowering production efficiency and lowering the yield rate of raw materials.
- the second object of the present invention is to provide an inorganic fiber sheet that can be manufactured without lowering the production efficiency and the yield rate of raw materials.
- the present inventors found that the above problem can be solved by setting the shot distribution state in the inorganic fiber sheet to a specific range, and completed the present invention. That is, the present invention is as follows.
- the present invention provides an inorganic fiber sheet that is a nonwoven fabric containing inorganic fibers,
- the inorganic fiber sheet has a thickness T of 1 mm or more,
- the inorganic fiber sheet contains shots derived from inorganic fibers and having a diameter of 45 ⁇ m or more,
- the inorganic fiber sheet is characterized in that the shot contained in the inorganic fiber sheet is distributed in the sheet thickness direction as represented by the following formula 1.
- (Formula 1) 1-Y/X ⁇ 0.11 In Formula 1, X represents "total weight of shots in inorganic fiber sheet per unit area"/"total weight of inorganic fiber sheet per unit area".
- Y represents "wire side surface of inorganic fiber sheet as a reference plane, the weight of the shot per unit area contained in the inorganic fiber sheet from which the thickness t portion satisfying 0 ⁇ t ⁇ s (however, 0.10 mm ⁇ s ⁇ 0.55 mm) is removed / “Inorganic Using the wire side surface of the fiber sheet as a reference surface, the weight per unit area of the inorganic fiber sheet with the thickness t removed.)
- the inorganic fibers have a fiber length of 600 ⁇ m or more.
- the content of the organic component in the inorganic fiber sheet is preferably 5.4 to 10.1% by mass based on the total weight of the inorganic fiber sheet.
- an inorganic fiber sheet that has high workability, etc., and is also excellent in adhesiveness or adhesiveness when a pressure-sensitive adhesive or adhesive is applied. Moreover, this inorganic fiber sheet can be manufactured without lowering the production efficiency and the yield rate of raw materials.
- FIG. 1 is a conceptual diagram of an inorganic fiber sheet manufacturing apparatus.
- the present invention is not limited to the following.
- the physical properties and evaluation of the inorganic fiber sheet shall be measured on the sample after standing for 12 hours in an atmosphere of 23°C/50% RH.
- the inorganic fiber sheet includes at least inorganic fibers and shots derived from inorganic fibers. Moreover, the inorganic fiber sheet may contain other components. Moreover, the inorganic fiber sheet may contain other layers, for example, an adhesive layer or an adhesive layer may be laminated.
- the density of the inorganic fiber sheet is preferably 50-1000 kg/m 3 , more preferably 100-500 kg/m 3 , particularly preferably 150-300 kg/m 3 . By setting the density of the inorganic fiber sheet within this range, it is possible to prevent the shot from falling off and to improve the mechanical strength and heat insulating properties.
- the thickness T of the inorganic fiber sheet is preferably 1 mm or more, more preferably 1 to 50 mm, in order to optimize the distribution of shots, which will be described later, and to obtain sufficient heat insulation. 2 to 6 mm is particularly preferred.
- the material constituting the inorganic fiber is not particularly limited as long as it can be formed into an inorganic fiber sheet. Examples include metals such as stainless steel fiber, nickel fiber, copper fiber, aluminum fiber, silver fiber, gold fiber, and titanium fiber. Fiber, glass fiber, carbon fiber, silica fiber, rock wool, slag wool, alumina fiber, ceramic fiber and the like can be used. Only one type of inorganic fiber may be used, or two or more types may be included.
- the fiber length of the inorganic fibers is preferably 500 ⁇ m or more, more preferably 600 ⁇ m or more, even more preferably 1000 to 3000 ⁇ m, particularly preferably 1000 to 2000 ⁇ m.
- the fiber diameter of the inorganic fibers is preferably 1-50 ⁇ m, more preferably 1-30 ⁇ m.
- the fiber length of an inorganic fiber is measured by the following methods. First, 0.1 g of a sample, or in the case of a sheet, a sample burned at 900° C. is dispersed in 10 g of water and stirred for 1 minute with a spatula. Next, one drop of the dispersion is placed on a preparation using a dropper, and a cover film is placed on the preparation. Thereafter, the sample was observed with a microscope at a magnification of 100 times, measured at 20 points in descending order of fiber length, and the average value of the 20 points was taken as the fiber length of the sample. Moreover, the fiber diameter of an inorganic fiber is measured by the following methods.
- 0.1 g of a sample, or in the case of a sheet, a sample burned at 900° C. is dispersed in 10 g of water and stirred for 1 minute with a spatula.
- one drop of the dispersion is placed on a preparation using a dropper, and a cover film is placed on the preparation.
- the sample is observed with a microscope at a magnification of 500 times, the fiber diameter is randomly measured at 20 points, and the average value of the 20 points is taken as the fiber diameter of the sample.
- the inorganic fiber sheet contains a predetermined amount of shots (shots derived from inorganic fibers) having a diameter of 45 ⁇ m or more.
- shots shots derived from inorganic fibers
- the upper limit of the diameter of the shot is not particularly limited because it depends on the diameter of the inorganic fiber, but is 5000 ⁇ m, 1000 ⁇ m, 500 ⁇ m, or the like.
- shots with a diameter of 45 ⁇ m or more are distributed in the sheet thickness direction within the inorganic fiber sheet as represented by the following formula 1.
- “1-Y/X” is more preferably 0.06 or less.
- the lower limit of “1-Y/X” is not particularly limited, but is -0.11, -0.10, -0.5 or 0.00, for example.
- the weight of shot in the inorganic fiber sheet per unit area can be measured according to JISR3311-1991. More specifically, the method for measuring the shot content in the inorganic fiber sheet is as follows. A sample weighing 2 g is burned in an electric furnace at 900° C. for 30 minutes to be incinerated. The weight of the combustion residue and the weight of a 45 ⁇ m mesh stainless sieve (JIS Z-8801) are measured. The combustion residue is transferred to a sieve and crushed under pressure to remove fibers. The shot content is calculated from the weight of the shot remaining on the sieve and the weight of the combustion residue.
- an inorganic fiber sheet from which a thickness t portion satisfying 0 ⁇ t ⁇ s (however, 0.10 mm ⁇ s ⁇ 0.55 mm) is removed using the wire side surface of the inorganic fiber sheet as a reference surface)
- 5000NS tape manufactured by Nitto Denko Co., Ltd.
- 5000NS is applied and laminated at a roll temperature of 80° C., a pressure of 0.05 MPa, and a speed of 0.4 m/min. After that, the sample is left at room temperature for 10 minutes, the tape is peeled off over 5 seconds, and a part of the sample is removed in the thickness direction.
- the distribution of shots differs between the vicinity of the surface and the vicinity of the center of the thickness. That is, in the inorganic fiber sheet, a high-density region with a high shot content is formed near the center of the thickness, while a low-density region with a low shot content is formed near the surface.
- a high-density region with a high shot content is formed near the center of the thickness
- a low-density region with a low shot content is formed near the surface.
- ⁇ Other Ingredients>> Other components include known components including organic components such as binders, paper strength agents, and organic fibers.
- the content of the organic component in the inorganic fiber sheet is preferably 1.0 to 15.0% by mass, more preferably 2.0 to 12.5% by mass, based on the total amount of the inorganic fiber sheet, Particularly preferably, it is 5.4 to 10.1% by mass.
- the content of organic components in the inorganic fiber sheet is measured by a method conforming to JIS-P8252. More specifically, it is as follows. A sample weight of 2 g is placed in a crucible and dried at 120° C./10 min before weight measurement. After that, it is burned in an electric furnace at 900° C. for 30 minutes to be incinerated. The weight reduction rate is calculated from the weight of the combustion residue and the weight after drying.
- the inorganic fiber sheet can be produced by wet papermaking, preferably using an inclined paper machine.
- a specific method of manufacturing an inorganic fiber sheet using the inclined paper machine shown in FIG. 1 will be described.
- a papermaking raw material liquid containing a dispersion medium and inorganic fibers is guided into the headbox.
- the raw papermaking liquid is supplied to the head box while controlling the supply amount of the raw papermaking liquid by a pump (not shown) to form a pool of the raw papermaking liquid.
- the papermaking raw material liquid is caused to convect by a water flow generator provided in a pool (water pool) of the papermaking raw material liquid.
- the raw material liquid for papermaking in the pool comes into contact with the forming wire running diagonally upward, and the solid content (inorganic fibers) is deposited on the raw material liquid for papermaking by dewatering (the dispersion medium is sucked) from below the forming wire. Then, an inorganic fiber sheet in a wet paper state is formed. As shown in FIG. 1, by providing a plurality of legs (No. 1 leg, No. 2 leg, etc.) during dehydration, the dehydration start position can be controlled. Finally, the inorganic fiber sheet in the wet paper state is passed through a drying device (such as a drying dryer) to obtain a base paper for the inorganic fiber sheet. The base paper for the inorganic fiber sheet may be wound into a roll if necessary. The inorganic fiber sheet may be appropriately cut into a desired size.
- a drying device such as a drying dryer
- the following operation may be performed. (1) “1-Y/X” can be reduced by moving the dehydration start position closer to the raw material input opening. (2) “1-Y/X” can be reduced by increasing the blowing pressure of the water flow generating mechanism (increasing the flow velocity of the water flow).
- the inorganic fiber sheet was measured for shot content, calculated for "1-Y/X", and measured for organic content (Igloss A (%)) according to the methods described above. Furthermore, the processability, flame retardancy, bending suitability, and wet strength (wire peeling resistance) of the inorganic fiber sheet were measured according to the methods described below. Table 2 shows the measurement results.
- ⁇ Flame Retardant>> A sample weight of 2 g is placed in an electric furnace at each specified temperature and burned for 5 minutes to be incinerated. Record the temperature range in which the sample ignites after it is placed in the electric furnace until it is ashed. ⁇ : Does not ignite up to 900°C, or does not ignite ⁇ : Ignites at 700°C ⁇ : Ignites at 500°C
Abstract
Description
また、特許文献2では、無機繊維を分散させた紙原料液の遠心分離を行い、スクリーンフィルタ等を通過させ、ショットの濃度を低減させる方法が提案されている。
前記無機繊維シートの厚さTが1mm以上であり、
前記無機繊維シートは、無機繊維に由来する、径が45μm以上であるショットを含有し、
前記無機繊維シートに含まれる前記ショットが、下記式1で表されるようにシート厚さ方向に分布していることを特徴とする、無機繊維シートである。
(式1)
1-Y/X≦0.11
(式1中、Xは「単位面積当たりの無機繊維シート中のショットの総重量」/「単位面積当たりの無機繊維シート総重量」を示す。また、Yは、「無機繊維シートのワイヤーサイド面を基準面として、0≦t≦s(ただし、0.10mm≦s≦0.55mm)を満たす厚さt部分を除去した無機繊維シートに含まれる、単位面積当たりのショットの重量」/「無機繊維シートのワイヤーサイド面を基準面として、厚さt部分を除去した無機繊維シートの、単位面積当たりの重量」を示す。)
前記無機繊維シート中の有機成分の含有量は、前記無機繊維シートの全量を基準として、5.4~10.1質量%であることが好ましい。
無機繊維シートは、無機繊維と無機繊維由来のショットとを少なくとも含む。また、無機繊維シートはその他の成分を含有していてもよい。また、無機繊維シートは、その他の層を含んでいてもよく、例えば、接着層や粘着層が積層されていてもよい。
<<密度>>
無機繊維シートの密度は、50~1000kg/m3であることが好ましく、100~500kg/m3であることがより好ましく、150~300kg/m3であることが特に好ましい。無機繊維シートの密度をこのような範囲とすることで、ショットの脱落を防止し、また、機械的強度・断熱性を向上させることができる。
無機繊維シートの厚さTは、後述するショットの分布状態を最適なものとし、また、十分な断熱性を得るために、1mm以上であることが好ましく、1~50mmであることがより好ましく、2~6mmであることが特に好ましい。
<<無機繊維>>
無機繊維を構成する材料としては、無機繊維シート化可能なものであれば特に限定されないが、例えば、ステンレス鋼繊維、ニッケル繊維、銅繊維、アルミニウム繊維、銀繊維、金繊維、チタン繊維等の金属繊維、ガラス繊維、炭素繊維、シリカ繊維、ロックウ-ル、スラグウ-ル、アルミナ繊維、セラミック繊維等とすることができる。無機繊維は、1種のみであってもよいし、2種以上を含んでいてもよい。
無機繊維の繊維長は、500μm以上であることが好ましく、600μm以上であることがより好ましく、1000~3000μmであることが更に好ましく、1000~2000μmであることが特に好ましい。無機繊維の繊維長をこのような範囲とすることで、長繊維の絡みによる地合いの悪化を防止しつつ、耐ワイヤー剥離性、耐引裂き性等の湿潤時強度を確保することができる。
無機繊維の繊維径は、1~50μmであることが好ましく、1~30μmであることがより好ましい。無機繊維の繊維径をこのような範囲とすることで、地合いの悪化を防止しつつ、骨材効果を得ることができ、また、繊維の絡み合いによる強度を確保することができる。
また、無機繊維の繊維径は、次のような方法にて測定する。まず、0.1gの試料、シートの場合は900℃に燃焼した試料を10gの水に分散させ、スパチュラで1分間攪拌する。次に、その分散液を、スポイトを使用してプレパラート上に1滴垂らし、カバーフィルムをかぶせる。その後、マイクロスコープにて倍率500倍で観察し、繊維径を無作為に20点測定し、その20点の平均値を試料の繊維径とする。
無機繊維シートは、径(直径)が45μm以上であるショット(無機繊維由来のショット)を所定量含む。ショットの径の上限は、無機繊維の径にもよるため特に限定されないが、5000μm、1000μm又は500μm等である。
1-Y/X≦0.11
(式1中、Xは「単位面積当たりの無機繊維シート中のショットの総重量」/「単位面積当たりの無機繊維シート総重量」を示す。また、Yは、「無機繊維シートのワイヤーサイド面を基準面として、0≦t≦s(ただし、0.10mm≦s≦0.55mm)を満たす厚さt部分を除去した無機繊維シートに含まれる、単位面積当たりのショットの重量」/「無機繊維シートのワイヤーサイド面を基準面として、厚さt部分を除去した無機繊維シートの、単位面積当たりの重量」を示す。)
有効数字として小数第3位まで有効とした場合、「1-Y/X≦0.11」を「1-Y/X<0.115」と読み替えることができる。
式1において、「1-Y/X」の下限値は特に限定されないが、例えば、-0.11、-0.10、-0.5又は0.00である。「1-Y/X」をこのような範囲とすることで、曲げ弾性やフェルトサイド面の加工性等を向上させることが可能であり、また、層間剥離の発生を防止し易くなる。
より具体的には、無機繊維シート中のショット含有率の測定方法は以下の通りである。
試料重量2gを900℃の電気炉にて30分燃焼し、灰化する。
燃焼残渣の重量と目開き45μmステンレス篩(JIS Z-8801)の重量を測定する。
燃焼残渣を篩に移し、加圧粉砕を行いながら、繊維を落とす。
篩に残ったショット重量と燃焼残渣重量からショット含有率を算出する。
5cm角の試料にNo.5000NS(日東電工社製テープ)を貼付し、ロール温度80℃、0.05MPa圧力、速度0.4m/minにてラミネートする。
その後10分間サンプルを室温環境下で放置し、テープを5秒かけて剥がし、厚み方向の一部を除去する。
その他の成分としては、バインダー、紙力増強剤、有機繊維等の有機成分を始めとした公知の成分が挙げられる。
試料重量2gをるつぼに入れ、120℃/10min乾燥させた後、重量測定を実施する。
その後、900℃の電気炉にて30分燃焼し、灰化する。
燃焼残渣の重量と乾燥後の重量から、重量減少率を算出する。
以下、無機繊維シートの製造方法の好ましい例について説明するが、無機繊維シートの製造方法はこれらには何ら限定されない。
先ず、分散媒体と無機繊維とを含む抄紙原料液をヘッドボックス内に案内する。
次に、図略のポンプで抄紙原料液の供給量を制御しながら、ヘッドボックスへ抄紙原料液を供給し、抄紙原料液のプール(水溜まり)を形成する。
次に、抄紙原料液のプール(水溜まり)に設けた水流発生装置によって、抄紙原料液を対流させる。
このプール内の抄紙原料液が斜め上方に走行するフォーミングワイヤーに接触し、フォーミングワイヤー下方から脱水(分散媒体が吸引)されることで、抄紙原料液上に固形分(無機繊維)が堆積していき、湿紙状態の無機繊維シートが形成される。図1に示すように、脱水に際して、複数のレグ(No.1レグ、No.2レグ等)を設けることで、脱水開始位置を制御することができる。
最後に、湿紙状態の無機繊維シートを乾燥装置(乾燥ドライヤー等)に通過させて、無機繊維シートの原紙を得る。
無機繊維シートの原紙は、必要に応じてロール状に巻き取られてもよい。
無機繊維シートは、所望の大きさとなるように、適宜裁断されてもよい。
(1)脱水開始位置を原料投入開口部から近づけることで、「1-Y/X」を低減させることができる。
(2)水流発生機構の吹き出し圧力を高める(水流の流速を早くする)ことで、「1-Y/X」を低減させることができる。
<無機繊維>
(無機繊維A)
新日本サーマルセラミックス(株)製 スーパーウール Plus 材質 :アルカリアースシリケート(AES)
繊維径:2.0~14.8μm
繊維長:530~3000μm
(無機繊維B)
イソライト工業(株)製 イソウールBSSR1300
材質 :アルカリアースシリケート(AES)
繊維径:2.7~13μm
繊維長:450~3000μm
(無機繊維C)
イソライト工業(株)製 イソフラックス バルク S17
材質 :アルカリアースシリケート(AES)
繊維径:1.5~11μm
繊維長:850~3200μm
<その他の成分>
アクリレート系ラテックス(バインダー)
図1に示す装置を使用して、使用する無機繊維、ヘッドボックス内の抄紙原料液(上記成分の水分散物の濃度)、水流発生装置の吹き出し圧(「左側」:図1の紙面奥側、「右側」:図1の紙面手前側)、バルブ開度(抄紙原料液の供給速度の調整)、脱水開始位置を表1に示す通りとして、実施例及び比較例に係る無機繊維シートの製造を行った。
前述の方法に従って、無機繊維シートの、ショット含有率測定、「1-Y/X」の算出、有機分(Igloss A(%))を測定した。
更に、以下に示す方法に従って、無機繊維シートの、加工性、難燃性、曲げ適正、Wet強度(耐ワイヤー剥離性)を測定した。
測定結果を表2に示す。
5cm角の試料にNo.5000NS(日東電工社製テープ)を貼付し、ロール温度80℃、0.05MPa圧力、速度0.4m/minにてラミネートする。
その後10分間サンプルを室温環境下で放置し、テープを5秒かけて剥がし、厚み方向の一部を除去する。
初期の試料厚さをA(mm)とし、No.5000NSに転写した厚さをB(mm)とする。
転写率:C(%)=B/A*100とした際に、Cの値について、以下の数値基準をもって加工性判断とする。
◎:C=16以上
〇:C=9.0以上16未満
×:C=9.0未満
試料重量2gを各指定温度の電気炉に入れ5分間燃焼し、灰化させる。
電気炉に入れた後灰化するまでに、試料が発火する温度帯を記録する。
○:900℃まで発火しない、又は、発火しない
△:700℃で発火
×:500℃で発火
サイズ:25mm×250mmの試料を用意し、抄紙時ワイヤー面を指定の直径の円柱状のものに1分間巻きつける。
その際、試料に亀裂が生じた際の筒状の径を記録する。
○:Φ60(mm)で亀裂が生じない
△:Φ100(mm)で亀裂が生じない
×:Φ100(mm)で亀裂が生じる
抄造時、脱水サクションにて水分を除去後、試料をワイヤーから剥がした後、端部を2箇所つかみ、持ち上げた際の状態を確認した(サンプルサイズ:25cm角)。
○:ワイヤーに抄造シートの残りがない、及び、持ち上げ時に紙切れしない
△:ワイヤーに抄造シートの残りがない、又は、持ち上げ時に紙切れしない
×:ワイヤーに抄造シートの残りがあり、持ち上げ時に紙切れする
Claims (3)
- 無機繊維を含む不織布である無機繊維シートであって、
前記無機繊維シートの厚さTが1mm以上であり、
前記無機繊維シートは、無機繊維に由来する、径が45μm以上であるショットを含有し、
前記無機繊維シートに含まれる前記ショットが、下記式1で表されるようにシート厚さ方向に分布していることを特徴とする、無機繊維シート。
(式1)
1-Y/X≦0.11
(式1中、Xは「単位面積当たりの無機繊維シート中のショットの総重量」/「単位面積当たりの無機繊維シート総重量」を示す。また、Yは、「無機繊維シートのワイヤーサイド面を基準面として、0≦t≦s(ただし、0.10mm≦s≦0.55mm)を満たす厚さt部分を除去した無機繊維シートに含まれる、単位面積当たりのショットの重量」/「無機繊維シートのワイヤーサイド面を基準面として、厚さt部分を除去した無機繊維シートの、単位面積当たりの重量」を示す。) - 前記無機繊維の繊維長が600μm以上である、請求項1記載の無機繊維シート。
- 前記無機繊維シート中の有機成分の含有量は、前記無機繊維シートの全量を基準として、5.4~10.1質量%である、請求項1又は2記載の無機繊維シート。
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JPH10317298A (ja) * | 1997-05-15 | 1998-12-02 | Tanaka Seishi Kogyo Kk | 無機繊維質ペーパー |
JPH11323769A (ja) | 1998-05-19 | 1999-11-26 | Mitsubishi Paper Mills Ltd | 無機繊維シート及びその製造方法 |
JP2002283486A (ja) * | 2001-03-27 | 2002-10-03 | Shinnikka Rock Wool Kk | 無機繊維シートとその製造方法 |
JP2003286677A (ja) * | 2002-03-28 | 2003-10-10 | Nitto Boseki Co Ltd | ガラス繊維シート、及びその製造方法 |
WO2004088774A1 (ja) * | 2003-03-31 | 2004-10-14 | Nippon Sheet Glass Company, Limited | 蓄電池用セパレータ及び蓄電池 |
JP2005265038A (ja) | 2004-03-18 | 2005-09-29 | Nippon Sheet Glass Co Ltd | 真空断熱材及び真空断熱材用無機繊維シートの製造方法 |
JP2018095976A (ja) * | 2016-12-08 | 2018-06-21 | 王子ホールディングス株式会社 | ガラス繊維不織布、複合体、繊維強化熱可塑性樹脂シート、金属張積層シート、ガラス繊維不織布の製造方法および繊維強化熱可塑性樹脂シートの製造方法 |
WO2020202901A1 (ja) * | 2019-03-29 | 2020-10-08 | 王子ホールディングス株式会社 | 耐熱断熱シート、その製造方法及び組電池 |
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Patent Citations (8)
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JPH10317298A (ja) * | 1997-05-15 | 1998-12-02 | Tanaka Seishi Kogyo Kk | 無機繊維質ペーパー |
JPH11323769A (ja) | 1998-05-19 | 1999-11-26 | Mitsubishi Paper Mills Ltd | 無機繊維シート及びその製造方法 |
JP2002283486A (ja) * | 2001-03-27 | 2002-10-03 | Shinnikka Rock Wool Kk | 無機繊維シートとその製造方法 |
JP2003286677A (ja) * | 2002-03-28 | 2003-10-10 | Nitto Boseki Co Ltd | ガラス繊維シート、及びその製造方法 |
WO2004088774A1 (ja) * | 2003-03-31 | 2004-10-14 | Nippon Sheet Glass Company, Limited | 蓄電池用セパレータ及び蓄電池 |
JP2005265038A (ja) | 2004-03-18 | 2005-09-29 | Nippon Sheet Glass Co Ltd | 真空断熱材及び真空断熱材用無機繊維シートの製造方法 |
JP2018095976A (ja) * | 2016-12-08 | 2018-06-21 | 王子ホールディングス株式会社 | ガラス繊維不織布、複合体、繊維強化熱可塑性樹脂シート、金属張積層シート、ガラス繊維不織布の製造方法および繊維強化熱可塑性樹脂シートの製造方法 |
WO2020202901A1 (ja) * | 2019-03-29 | 2020-10-08 | 王子ホールディングス株式会社 | 耐熱断熱シート、その製造方法及び組電池 |
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