WO2005011841A1 - 耐水性フィルタ - Google Patents
耐水性フィルタ Download PDFInfo
- Publication number
- WO2005011841A1 WO2005011841A1 PCT/JP2004/009969 JP2004009969W WO2005011841A1 WO 2005011841 A1 WO2005011841 A1 WO 2005011841A1 JP 2004009969 W JP2004009969 W JP 2004009969W WO 2005011841 A1 WO2005011841 A1 WO 2005011841A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sheet
- filter
- water
- fiber
- resistance
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
- B01J20/2804—Sheets with a specific shape, e.g. corrugated, folded, pleated, helical
Definitions
- the present invention relates to a filter having low airflow resistance and excellent water resistance.
- Patent Documents 1 and 2 disclose filters in which a sheet containing activated carbon is formed into a pleated shape. In an environment where moisture is easily taken in while applying force, the shape of the filter is deformed and the pressure loss rises easily. A filter that compensates for the drawbacks of the activated carbon filter has been desired.
- Patent Document 1 JP-A-2-135141
- Patent Document 2 JP-A-2000-24426
- the present invention has developed an adsorbent particle-containing sheet using a water-resistant fiber in a pleat unit containing adsorbent particles, and a highly permeable gas-permeable sheet. It was found that the problem could be solved by stacking and integrating. That is, the present invention provides (1) a filter in which the adsorptive sheet is formed in a pleated shape and the air flow resistance A / air flow resistance B ⁇ 1.2 (however, A and B are used under the following conditions).
- A The air flow is continuously supplied for 80 cc / min X 10 min, and then the ventilation resistance is the lowest, only the ventilation is performed.
- the filter surface wind speed is 3.7 m / s. Ventilation resistance, wind speed on the filter surface 3.7 m / s).
- the filter of the present invention can provide a filter and a filter medium that can suppress a large increase in airflow resistance without requiring a separator or the like for fixing pleats, even when a large amount of water is taken into the filter. it can.
- FIG. 1 shows a schematic diagram of a water resistance test method according to the present invention.
- FIG. 2 is a schematic diagram of a filter unit shape of the present invention.
- FIG. 3 shows a comparison between the example and the comparative example of the pressure drop change behavior during the water resistance test of the present invention.
- FIG. 4 is a schematic view of a typical structure of the adsorptive sheet according to the present invention.
- the adsorptive sheet of the present invention is a sheet obtained by laminating and integrating an adsorbent particle-containing sheet composed of adsorptive particles, support fibers, and adhesive fibers and a breathable sheet.
- the average particle diameter of the adsorbent particles used in the adsorbent particle-containing sheet constituting the adsorbent sheet of the present invention is a value determined by JIS standard sieve CJIS Z8801) in consideration of air permeability, falling off of the adsorbent, papermaking properties, and the like. It is preferable that the average is 100-600 / im, and if 200-500 ⁇ is more preferable.
- the average particle diameter is less than 100 ⁇ , the airflow resistance becomes too large to obtain a certain high adsorption capacity, and at the same time the sheet packing density becomes high, causing an early rise in pressure loss when dust is supplied. It also causes. If the average particle size exceeds 600 xm, the particles are liable to fall off, the initial adsorption performance in one pass becomes extremely low, and furthermore, the pleated and honeycomb-shaped air purification filters are used. Workability during bending and corrugation is poor.
- the above-mentioned adsorptive particles can be obtained by performing a predetermined particle size adjustment using an ordinary classifier.
- the adsorbent particles contained in the adsorbent particle-containing sheet of the present invention preferably contain 3090% by weight of adsorbent particles. If the content is less than 30% by weight, good adsorption performance cannot be obtained. It is not preferable because it decreases.
- the adsorbent particle-containing sheet of the present invention preferably contains 5 to 50% by weight of a supporting fiber. If the amount is less than 5% by weight, the papermaking properties will be poor, and if it exceeds 50% by weight, the adsorption effect will be poor.
- the outer surface area of the supporting fibers used in the adsorbent particle-containing sheet of the present invention is preferably lm 2 Zg or less. If it exceeds lm 2 / g, the air permeability and papermaking properties are reduced.
- both fibers subjected to fibrillation and fibers not subjected to fibrillation are used.
- the fiber length of the support fiber used in the adsorbent particle-containing sheet of the present invention is preferably 3 to 20 mm. If it is less than 3 mm, the air permeability will be poor, and if it is more than 20 mm, the papermaking property and the formation of the sheet will be poor, and the variation in air flow resistance and adsorption performance will be large.
- the material of the supporting fibers used in the adsorbent particle-containing sheet of the present invention is preferably a material that is difficult to absorb moisture.
- a material that is difficult to absorb moisture for example, polyester, polyacrylonitrile, polyamide, polyolefin, vinylon, glass fiber and the like are used. These fibers are preferred from the viewpoint of dimensional stability.
- the fiber shape may be concentric or irregular. Cracky or stiff fibers can also be used.
- mixing with adsorbent particles is not easy because fibers that do not easily absorb water are used. However, formation can be further improved by adding a small amount of a surfactant.
- the adhesive fiber used in the adsorptive sheet of the present invention is not particularly limited as long as it is an adhesive component at the time of compounding, such as water-swellable fiber or hot-melt fiber.
- an adhesive component at the time of compounding such as water-swellable fiber or hot-melt fiber.
- polybutyl alcohol fiber, polyethylene fiber And polypropylene-polyethylene, polyester conjugate fiber, polyamide conjugate fiber and the like are preferably used.
- these fibers may have a sea core structure, a side-by-side structure, or a crumpled fiber. Further, a part or all of the above supporting fibers may be such adhesive fibers.
- the fiber length of the adhesive fiber used in the adsorbent particle-containing sheet of the present invention is 1 to 20 mm. Les, preferably to be. If it is less than 1 mm, the air permeability will be poor, and if it is more than 20 mm, the papermaking property and the formation of the sheet will be poor, and the variation in air flow resistance and adsorption performance will be large.
- the mixing ratio of the adhesive fiber used in the adsorbent particle-containing sheet of the present invention is more preferably from 1 to 30 parts by weight, more preferably from 5 to 20 parts by weight.
- the amount is less than 1 part by weight, the function as an adhesive component cannot be exhibited.
- the amount exceeds 30 parts by weight, the adsorptivity is relatively reduced and the airflow resistance is increased.
- the adsorbent particle-containing sheet of the present invention may be configured to include components having ancillary functions such as antibacterial agents, antifungal agents, antiviral agents, and flame retardants. These components may be kneaded into the fibers or may be added and carried in post-processing to impart them. For example, by including a flame retardant, it is possible to manufacture an adsorptive sheet that meets the flame retardancy standard and the UL flame retardant standard specified in FMVSS.302. Further, the use of fibers having adsorptive performance to fibers, for example, ion-exchange fibers, can enhance the deodorizing function.
- ancillary functions such as antibacterial agents, antifungal agents, antiviral agents, and flame retardants.
- the thickness of the adsorbent particle-containing sheet of the present invention is preferably from 0.3 to 2.5 mm. This is to improve air permeability and heat resistance.
- weight of the adsorbent particle-containing sheet of the present invention 50 g / m 2 or more. This is because high adsorption capacity can be realized.
- the packing density of the adsorbent particle-containing sheet of the present invention is preferably 0.15 to 0.3 g / cc, and more preferably 0.1 to 0.25 g / cc. If it is less than 0.15 g / cc, the dust removal efficiency will be low, and if it exceeds 0.3 g / cc, it will cause an early rise in pressure loss due to clogging, which is not desirable for a filter. In order to adjust the sheet density to such a value, it is more preferable to mix a suitable amount of a fiber having a fiber diameter of 15 ⁇ m or more in the supporting fiber because it is easy to provide a gap between the fiber and the adsorbent particles.
- the adsorbent particle-containing sheet of the present invention is produced, for example, as follows. That is, adsorbent particles, supporting fibers, and adhesive fibers are dispersed in water to form a slurry, which is then subjected to a long net, short net, circular net, etc. method to remove moisture to form a wet web, and then pressed. After gently squeezing or sucking with a mouth-roller, contact the sheet with a rotary drying drum to dry the sheet. Can be manufactured. Also, the yield can be improved by adding an appropriate amount of a polymer or inorganic dispersant or coagulant to the slurry.
- the adsorbent particle-containing sheet of the present invention can also be produced by a method in which the slurry is poured into a mold or resin mold having a hole having air permeability, followed by suction and drying.
- a nonwoven web containing supporting fibers and adhesive fibers is prepared in advance, and the adsorbent particles are dispersed therein, and then the sheet is formed by blowing hot air, or the adsorbent particles are dried under dry conditions. It may be a production method in which a fibrous or powdery binder is integrated under heat treatment.
- the adsorptive sheet of the present invention it is preferable to laminate a breathable sheet on the adsorbent particle-containing sheet described above from the viewpoint of enhancing water resistance. Furthermore, it is possible to more reliably prevent the adsorbent particles from dropping off at the time of bending force or at the time of use as a filter.
- the type of the breathable sheet is not particularly limited, and for example, a nonwoven fabric, a woven fabric, a knitted fabric, or the like is suitably used.
- the material of the fibers constituting the breathable sheet is preferably a material that does not easily absorb moisture. 20 ° C
- a material having a standard moisture content of 15% or less under 95% RH is preferable.
- polyester, polyacrylonitrile, polyamide, polyolefin, vinylon, glass fiber and the like are used.
- the fiber shape may be concentric or irregular. Fibers with strong cramping can also be used.
- the fiber diameter of the fibers constituting the breathable sheet is preferably 15 ⁇ 15 ⁇ or more on average. Further preferably, fibers having an average of 30 ⁇ m or more are the main constituent fibers. If the fiber diameter is less than 15 ⁇ on average, airflow resistance tends to be high, which is not very preferable.
- basis weight breathable sheet Shi preferred is 10 150 g / m 2 les. If it is 10 g / m 2 or less, there is a problem in the strength surface and the activated carbon falling off the surface of the sheet containing the adsorbent particles. If it is larger than 150 g / m 2 , the airflow resistance is high and the sheet thickness is excessively large. Therefore, when it is made into pleat unit, the structural resistance becomes large and it is not practical.
- the packing density of the breathable sheet is preferably less than 0.4 gZcc. At 0.4 g / cc or more, the air permeability is poor and the amount of retained dust tends to be small. [0029] It is preferable that the ventilation resistance of the permeable sheet is less than 10OPa at a linear velocity of 30cm / s. Above lOPa, the overall airflow resistance is undesirably too high for practical purposes.
- the thickness of the breathable sheet is preferably 0.1 mm or more and 1.0 mm or less. If the thickness is less than 0.1 mm, the practical strength is not sufficient, which is not preferable. 1. If it is larger than Omm, the sheet thickness is too thick and the unit
- the structural resistance is undesirably increased.
- the method for producing the air-permeable sheet is not particularly limited, and examples thereof include, but are not limited to, a spun bond method, a thermal bond method, and a chemical bond method.
- Rigidity of breathable sheet Pio The rigidity according to the ISL1096B method (slide method) is preferably 1. ON 'cm or more in both the longitudinal direction (MD) and the cross direction (TD). 1. If it is less than ON 'cm, the unit will be easily deformed after the water resistance test, and the air flow resistance will easily increase.
- the air-permeable sheet may be an electret-shaped air-permeable sheet. This is because the laminating of the air-permeable sheets that have been subjected to electret removal can increase the effect of removing submicron particles such as tobacco smoke particles, carbon particles, and sea salt particles.
- the method of laminating the adsorbent particle-containing sheet and the breathable sheet is not particularly limited.
- a small amount of adhesive is applied, or a bonding method utilizing heat-fusibility, for example, a method of spraying an adhesive fiber onto an adherend, inserting a thermoplastic or thermosetting powder resin or an adhesive sheet between the sheets.
- a heating method, a method of bonding by pressing a press, and a method of fusing and bonding by ultrasonic waves are preferably used.
- the kind of the adhesive there are various types such as a polyester type, a polyolefin type, a polyamide and an atalyl type, but it is preferable to use a material which does not easily absorb moisture.
- the air purification filter 1 of the present invention is used by molding the adsorptive sheet described above into a pleated or corrugated shape.
- the thickness of the air purification filter of the present invention is preferably from 10 to 400 mm.
- a large filter unit of about 10-60 mm which is often installed in building air-conditioning applications, due to the usual internal space.
- about 40 to 400 mm is preferable considering the storage space.
- the air purifying filter of the present invention preferably has a ridge peak interval of 230 mm. 2mm If it is less than this, the folds and mountains will be too close together, resulting in a large dead space and the inefficient use of seats. On the other hand, if it is larger than 30 mm, the sheet development area becomes small, so that the removal effect according to the filter thickness cannot be obtained.
- the air-permeable sheet side is disposed on the upstream side. By doing so, dust can be efficiently caught on the upstream side, so that the utility of the adsorbent particles can be extended.
- the airflow resistance of the sheet is a value under the condition of a linear velocity of 30 cm / s:
- the airflow resistance of the unit is a value under the condition of a wind speed over the filter of 3.7 m / s.
- Sheet packing density (g / cc) sheet basis weight / sheet thickness [sheet thickness is a value under a load of 0.7 kPa]
- Polyester core-sheath composite fiber having 70 parts by weight of granular activated carbon having an average particle diameter of 200 ⁇ m, 10 parts by weight of 6 denier X fiber length of 5 mm polyester fiber, and 2 denier X fiber length of 5 mm 8 parts by weight, 12 parts of 1 denier X 3 mm fiber length polybutyl alcohol, which is a water-swellable hot-melt fiber, is dispersed in water with a pulper. Further, a fatty acid-based cationic surfactant (trade name: Santol KL, manufactured by Nichika Chemical Co., Ltd.) was added in an amount of 1 part by weight to prepare a stock solution for wet papermaking.
- a fatty acid-based cationic surfactant trade name: Santol KL, manufactured by Nichika Chemical Co., Ltd.
- a filter unit with a length of 200 mm, a width of 200 mm, a peak height of 30 mm, and a pleated peak pitch of 6 mm was manufactured.
- the filter unit was fixed by using a polypropylene resin plate with a thickness of 3 mm on the side and firmly bonded with polyethylene hot melt resin. That is, the fixing was performed only on the filter end surface (Fig. 2). ).
- the initial airflow resistance was 110 Pa
- the airflow resistance after the water resistance test was 120 Pa.
- the deformation of the unit shape during and after the water resistance test was very small.
- Comparative Example 1 70 parts by weight of granular activated carbon having an average particle diameter of 200 ⁇ m, 6 parts by weight of 8 denier X fiber length 8 mm rayon fiber, 4 parts by weight of 4 denier X 4 mm rayon fiber, water swelling heat Melt fiber, 1 denier ⁇ 12 parts of polyvinyl alcohol having a fiber length of 3 mm, was dispersed in water with a pulper to prepare a stock solution for wet papermaking. Make wet web this by papermaking with a foraminous papermaking method, then dried by rotary drying drum lightly squeeze 140 ° C with a press roller and a basis weight of 170 g / m 2, the sheet packing density 0. 21g / cc An adsorbent-containing sheet was obtained.
- a spunbond nonwoven fabric with a basis weight of 20 g / m 2 made of polyester as a breathable sheet (thickness 0.15 mm, ventilation resistance 4 Pa, MD softness 0.4 N * cm, TD softness 0.2 N'cm)
- the polyamide nonwoven fabric having a melting point of 110 ° C and a basis weight of lOgZm 2 was sandwiched between two layers, and hot-pressed at 130 ° C to produce a laminated sheet. From this sheet, a filter unit having a length of 200 mm, a width of 200 mm, a peak height of 30 mm, and a pleated peak pitch of 6 mm was prepared. The unit was manufactured in the same manner as in Example 1.
- Example 2 100 parts by weight of granular activated carbon having an average particle diameter of 200 ⁇ and 10 parts by weight of an ethylene-acrylic acid copolymerized thermoplastic binder having an average particle diameter of 10 ⁇ m as a thermoplastic powder resin were sufficiently mixed in advance. Then, after spraying on an ethylene-polyester composite nonwoven fabric (basis weight 20 g / m 2 ) so as to have a basis weight of 13 Og / m 2 , further cover the breathable sheet described in Example 1 from above and heat at 120 ° C.
- the present invention provides a filter and a filter material capable of suppressing a large increase in air flow resistance without requiring a separator for fixing the folds, even when a large amount of water is taken into the filter. Yes, it can be used in a wide range of fields such as filters for air purification in environments where moisture is easily taken in, and greatly contributes to the industry.
Abstract
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Applications Claiming Priority (2)
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JP2003-198371 | 2003-07-17 | ||
JP2003198371A JP2005034710A (ja) | 2003-07-17 | 2003-07-17 | 耐水性フィルタ |
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PCT/JP2004/009969 WO2005011841A1 (ja) | 2003-07-17 | 2004-07-13 | 耐水性フィルタ |
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Families Citing this family (4)
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JP4551253B2 (ja) * | 2005-03-29 | 2010-09-22 | 日本バイリーン株式会社 | ガス除去用フィルタエレメント及びその製造方法 |
JP2007021455A (ja) * | 2005-07-21 | 2007-02-01 | Toyobo Co Ltd | 復元性フィルター |
JP2010139183A (ja) * | 2008-12-12 | 2010-06-24 | Toshiba Corp | 冷蔵庫 |
JP5347750B2 (ja) * | 2009-06-19 | 2013-11-20 | 東洋紡株式会社 | 難燃性脱臭フィルタ |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10296021A (ja) * | 1997-04-24 | 1998-11-10 | Zexel Corp | 車両用空調装置の脱臭フィルタ |
JPH11179121A (ja) * | 1997-12-24 | 1999-07-06 | Toray Ind Inc | フィルター用基材およびそれからなるフィルター装置 |
JP2002095921A (ja) * | 2000-09-26 | 2002-04-02 | Mitsubishi Paper Mills Ltd | 空気清浄化フィルター |
JP2002291860A (ja) * | 2001-03-30 | 2002-10-08 | Mitsubishi Paper Mills Ltd | 通気性脱臭フィルター |
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JP2672609B2 (ja) * | 1988-12-02 | 1997-11-05 | 三菱製紙株式会社 | ▲ろ▼材 |
JP3004021B2 (ja) * | 1989-07-20 | 2000-01-31 | 三菱製紙株式会社 | エアフィルタ用濾材 |
JPH08281030A (ja) * | 1995-04-19 | 1996-10-29 | Toyobo Co Ltd | 空気清浄用フィルターシート |
JPH11276833A (ja) * | 1998-03-31 | 1999-10-12 | Tennex Corp | 室内空気処理用のフィルタ部材 |
JP3783820B2 (ja) * | 1998-10-09 | 2006-06-07 | 東洋紡績株式会社 | 空気浄化用フィルター |
JP3783819B2 (ja) * | 1998-10-09 | 2006-06-07 | 東洋紡績株式会社 | 空気浄化用フィルター |
JP3714453B2 (ja) * | 1998-05-08 | 2005-11-09 | 東洋紡績株式会社 | 吸着性シート及びその製造方法並びに空気浄化用フィルター |
JP2002242065A (ja) * | 2001-02-19 | 2002-08-28 | K S T:Kk | 粒状粉体を保持した不織布製シート |
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- 2003-07-17 JP JP2003198371A patent/JP2005034710A/ja active Pending
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- 2004-07-13 WO PCT/JP2004/009969 patent/WO2005011841A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10296021A (ja) * | 1997-04-24 | 1998-11-10 | Zexel Corp | 車両用空調装置の脱臭フィルタ |
JPH11179121A (ja) * | 1997-12-24 | 1999-07-06 | Toray Ind Inc | フィルター用基材およびそれからなるフィルター装置 |
JP2002095921A (ja) * | 2000-09-26 | 2002-04-02 | Mitsubishi Paper Mills Ltd | 空気清浄化フィルター |
JP2002291860A (ja) * | 2001-03-30 | 2002-10-08 | Mitsubishi Paper Mills Ltd | 通気性脱臭フィルター |
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