JPWO2020116569A1 - Long-fiber non-woven fabric and filter reinforcement using it - Google Patents
Long-fiber non-woven fabric and filter reinforcement using it Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 332
- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 178
- 230000002787 reinforcement Effects 0.000 title 1
- 239000012779 reinforcing material Substances 0.000 claims abstract description 28
- 230000003746 surface roughness Effects 0.000 claims abstract description 27
- 238000005452 bending Methods 0.000 claims abstract description 15
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- 229920002223 polystyrene Polymers 0.000 claims description 24
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- 239000004416 thermosoftening plastic Substances 0.000 claims description 24
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- 238000003825 pressing Methods 0.000 abstract description 24
- 230000014759 maintenance of location Effects 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 4
- 238000002788 crimping Methods 0.000 description 59
- 238000009987 spinning Methods 0.000 description 41
- -1 Polyethylene terephthalate Polymers 0.000 description 40
- 238000012545 processing Methods 0.000 description 38
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 32
- 229920000139 polyethylene terephthalate Polymers 0.000 description 30
- 239000005020 polyethylene terephthalate Substances 0.000 description 30
- 238000005259 measurement Methods 0.000 description 19
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- 230000000452 restraining effect Effects 0.000 description 15
- 238000003754 machining Methods 0.000 description 14
- 238000002156 mixing Methods 0.000 description 13
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 12
- 239000004744 fabric Substances 0.000 description 10
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- 230000000694 effects Effects 0.000 description 8
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 7
- 239000002131 composite material Substances 0.000 description 7
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- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 3
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 3
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- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- FEIQOMCWGDNMHM-UHFFFAOYSA-N 5-phenylpenta-2,4-dienoic acid Chemical compound OC(=O)C=CC=CC1=CC=CC=C1 FEIQOMCWGDNMHM-UHFFFAOYSA-N 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 238000002074 melt spinning Methods 0.000 description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic 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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/009—Condensation or reaction polymers
- D04H3/011—Polyesters
-
- 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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Filtering Materials (AREA)
Abstract
長繊維不織布は、平均繊維径が３０μｍ以上６０μｍ以下であり、目付が５０ｇ／ｍ２以上１２０ｇ／ｍ２以下であって、ＭＤ方向の８０℃における１０％伸長時応力が６０Ｎ／５ｃｍ以下でありかつ８０℃で５．２ｋＰａの圧力下で１０秒プレスした後の折れ角度が１５°以下であるか、あるいは、一方の表面の表面粗さが２．０以下でありかつもう一方の表面の表面粗さが３．５以上である。これにより、フィルター補強材に適したプリーツ加工性を有し、さらに、プリーツ形態保持性を満足する剛性を有するか、あるいは、フィルター濾材との貼り合わせに好適な長繊維不織布を得ることができる。The long fiber non-woven fabric has an average fiber diameter of 30 μm or more and 60 μm or less, a grain size of 50 g / m 2 or more and 120 g / m 2 or less, and a stress at 10% elongation at 80 ° C. in the MD direction of 60 N / 5 cm or less. And the bending angle after pressing at 80 ° C. under a pressure of 5.2 kPa for 10 seconds is 15 ° or less, or the surface roughness of one surface is 2.0 or less and the surface of the other surface. The roughness is 3.5 or more. As a result, it is possible to obtain a long-fiber non-woven fabric which has pleating workability suitable for the filter reinforcing material, has rigidity satisfying the pleated shape retention property, or is suitable for bonding with the filter filter material.
Description
本発明は、フィルター補強材に適した長繊維不織布およびそれを用いたフィルター補強
材に関する。The present invention relates to a long fiber non-woven fabric suitable for a filter reinforcing material and a filter reinforcing material using the same.
ポリエチレンテレフタレート長繊維不織布は、力学的物性が良好で、通気性、通水性もあり、多くの用途で使用されている。しかし、ポリエチレンテレフタレート長繊維不織布を成型体の素材として用いる場合、広い温度域で凹凸等の型に追従することが困難であり、様々な形状に成型することが困難であった。 Polyethylene terephthalate long-fiber non-woven fabric has good mechanical characteristics, breathability, and water permeability, and is used in many applications. However, when polyethylene terephthalate long fiber non-woven fabric is used as a material for a molded body, it is difficult to follow a mold such as unevenness in a wide temperature range, and it is difficult to mold into various shapes.
空気清浄機や自動車のキャビンフィルターでは、除塵性能や除煙性能等を高めるため、フィルターをプリーツ状に加工して使用することが一般的である。それらのフィルターの補強材として不織布を用いる場合、用いる不織布は任意のひだ数、ひだ間隔にプリーツ加工できる特性が求められる。 In air purifiers and cabin filters of automobiles, it is common to process the filter into a pleated shape in order to improve dust removal performance and smoke removal performance. When a non-woven fabric is used as a reinforcing material for these filters, the non-woven fabric used is required to have the property of being able to be pleated at an arbitrary number of folds and fold intervals.
フィルター補強材として用いられる不織布としては、低融点樹脂を鞘成分に配したポリエチレンテレフタレート系の芯鞘複合繊維を用いた短繊維不織布や低融点樹脂繊維を混繊した長繊維不織布が提案されている（例えば、特許文献１（特開２００８-２３１５９７号公報）を参照）。これらの不織布は両面フラットのカレンダー加工処理を施しているため不織布両面が平滑であり、そのためプリーツ加工性が劣る上製造に係るコストが大きい問題がある。 As the non-woven fabric used as the filter reinforcing material, a short-fiber non-woven fabric using a polyethylene terephthalate-based core-sheath composite fiber in which a low-melting resin is arranged as a sheath component and a long-fiber non-woven fabric mixed with a low-melting resin fiber have been proposed. (For example, refer to Patent Document 1 (Japanese Unexamined Patent Publication No. 2008-231597)). Since these non-woven fabrics are subjected to a double-sided flat calendar processing process, both sides of the non-woven fabric are smooth, so that there is a problem that the pleating workability is inferior and the manufacturing cost is high.
また、ポリエチレンテレフタレート長繊維不織布を用いるフィルター補強材が提案されている（例えば、特許文献２（特開２０１１−０００５３６号公報）を参照）。しかし、このフィルター補強材は彫刻が施されたエンボスロールとフラットロールを製造時使用するため、不織布片面に彫刻の凹凸が転写されているが、微細な凹凸ではないためプリーツ加工性が劣るという問題がある。また、目付量を多くして剛性を高めて形態保持性を確保しているため、厚みの増加によりフィルターユニットとして圧力損失が大きくなる、プリーツ加工性が劣るという問題があった。 Further, a filter reinforcing material using a polyethylene terephthalate long fiber non-woven fabric has been proposed (see, for example, Patent Document 2 (Japanese Unexamined Patent Publication No. 2011-000536)). However, since this filter reinforcing material uses engraved embossed rolls and flat rolls during manufacturing, the unevenness of the engraving is transferred to one side of the non-woven fabric, but there is a problem that the pleating workability is inferior because it is not fine unevenness. There is. Further, since the basis weight is increased to increase the rigidity and the shape retention is ensured, there is a problem that the pressure loss becomes large as a filter unit due to the increase in thickness and the pleating workability is inferior.
本発明は上記事情に鑑みてなされたものであり、フィルター補強材に適したプリーツ加工性を有し、さらに、プリーツ形態保持性を満足する剛性を有した長繊維不織布を得ること、あるいは、フィルター濾材との貼り合わせに好適な（すなわち、フィルター濾材を貼り合わせる方の不織布表面は平滑性を有し、他方の不織布表面は微細な凹凸を有する）長繊維不織布を得ることを課題とするものである。 The present invention has been made in view of the above circumstances, and it is possible to obtain a long-fiber non-woven fabric having pleating workability suitable for a filter reinforcing material and having rigidity satisfying pleated shape retention, or a filter. An object of the present invention is to obtain a long-fiber non-woven fabric suitable for bonding with a filter medium (that is, the surface of the non-woven fabric to which the filter filter material is bonded has smoothness and the surface of the other non-woven fabric has fine irregularities). be.
本発明者らは鋭意検討した結果、以下に示す手段により、上記課題を解決できることを見出し、本発明に至った。すなわち、本発明は以下のとおりである。 As a result of diligent studies, the present inventors have found that the above problems can be solved by the means shown below, and have arrived at the present invention. That is, the present invention is as follows.
［１］平均繊維径が３０μｍ以上６０μｍ以下である繊維からなり、目付が５０ｇ／ｍ２以上１２０ｇ／ｍ２以下であり、ＭＤ方向の８０℃における１０％伸長時応力が６０Ｎ／５ｃｍ以下であり、８０℃で５．２ｋＰａの圧力下で１０秒プレスした後の折れ角度が１５°以下である長繊維不織布。[1] It is composed of fibers having an average fiber diameter of 30 μm or more and 60 μm or less, a grain size of 50 g / m 2 or more and 120 g / m 2 or less, and a stress at 10% elongation at 80 ° C. in the MD direction of 60 N / 5 cm or less. , A long-fiber non-woven fabric having a bending angle of 15 ° or less after being pressed at 80 ° C. under a pressure of 5.2 kPa for 10 seconds.
［２］平均繊維径が３０μｍ以上６０μｍ以下である繊維からなり、目付が５０ｇ／ｍ２以上１２０ｇ／ｍ２以下であり、一方の表面の表面粗さが２．０以下であり、もう一方の表面の表面粗さが３．５以上である長繊維不織布。[2] It is composed of fibers having an average fiber diameter of 30 μm or more and 60 μm or less, a texture of 50 g / m 2 or more and 120 g / m 2 or less, a surface roughness of one surface of 2.0 or less, and the other. A long-fiber non-woven fabric with a surface roughness of 3.5 or more.
［３］長繊維不織布を構成する繊維の複屈折（Δｎ）が０．００５以上０．０２０以下である上記［１］または［２］に記載の長繊維不織布。 [3] The long-fiber non-woven fabric according to the above [1] or [2], wherein the birefringence (Δn) of the fibers constituting the long-fiber non-woven fabric is 0.005 or more and 0.020 or less.
［４］長繊維不織布を構成する繊維が、主成分であるポリエチレンテレフタレートに熱可塑性ポリスチレン系共重合体を０．０２質量％以上５質量％以下で混合した樹脂からなる単一繊維である上記［１］〜［３］のいずれか１つに記載の長繊維不織布。 [4] The fiber constituting the long-fiber non-woven fabric is a single fiber made of a resin obtained by mixing a thermoplastic polystyrene-based copolymer with polyethylene terephthalate as a main component in an amount of 0.02% by mass or more and 5% by mass or less. The long-fiber non-woven fabric according to any one of 1] to [3].
［５］熱可塑性ポリスチレン系共重合体のガラス転移点温度が１００℃以上１６０℃以下である上記［４］に記載の長繊維不織布。 [5] The long-fiber non-woven fabric according to the above [4], wherein the glass transition temperature of the thermoplastic polystyrene-based copolymer is 100 ° C. or higher and 160 ° C. or lower.
［６］上記［１］〜［５］のいずれか１つに記載の長繊維不織布を用いたフィルター補強材。 [6] A filter reinforcing material using the long fiber non-woven fabric according to any one of the above [1] to [5].
本発明によれば、上記［１］および［３］〜［６］の構成により、プリーツ加工性に優れ、実使用下でひだ密着し難い剛性を有しプリーツ形態保持性の優れた、フィルター補強材に適した長繊維不職布が得られる。また、単一成分の繊維から構成される長繊維不織布であるため、製造コストが安価な長繊維不職布を提供できる。 According to the present invention, according to the above configurations [1] and [3] to [6], the filter is reinforced with excellent pleating workability, rigidity that does not easily adhere to folds under actual use, and excellent pleating shape retention. A long-fiber unemployed cloth suitable for the material can be obtained. Further, since it is a long-fiber non-woven fabric composed of fibers of a single component, it is possible to provide a long-fiber non-woven fabric at a low manufacturing cost.
また、本発明によれば、上記［２］〜［６］の構成により、濾材との貼り合わせ性とプリーツ加工性に優れ、フィルター補強材に適した長繊維不職布が得られる。また、単一成分の繊維から構成される長繊維不織布であるため、製造コストが安価な利点も有する。 Further, according to the present invention, according to the above configurations [2] to [6], a long fiber unemployed cloth which is excellent in adhesiveness to a filter medium and pleated workability and suitable for a filter reinforcing material can be obtained. Further, since it is a long-fiber non-woven fabric composed of fibers of a single component, it has an advantage that the manufacturing cost is low.
＜実施形態１＞
実施形態１として、上記［１］および［３］〜[５]の構成を備える長繊維不織布および上記［６］の構成を備えるフィルター補強材について詳細に説明する。<Embodiment 1>
As the first embodiment, the long-fiber non-woven fabric having the above-mentioned configurations [1] and [3] to [5] and the filter reinforcing material having the above-mentioned constitution [6] will be described in detail.
本発明者らは、プリーツ加工性に優れ、プリーツ形態保持性の優れたフィルター補強材に適した剛性を有する長繊維不職布を得るために鋭意検討した。その結果、ポリエチレンテレフタレートを主原料とした繊維からなる８０℃で１０％伸長時の経方向の応力が６０Ｎ／５ｃｍ以下である長繊維不織布を利用することでフィルター補強材に適した長繊維不職布が得られることを見出した。 The present inventors have diligently studied to obtain a long-fiber unemployed cloth having excellent pleating workability and rigidity suitable for a filter reinforcing material having excellent pleated shape retention. As a result, by using a long-fiber non-woven fabric made of fibers made of polyethylene terephthalate as a main raw material and having a stress in the warp direction at 80 ° C. and a stress in the warp direction of 60 N / 5 cm or less at 80 ° C. Found that cloth can be obtained.
本発明の実施形態１の長繊維不織布のＭＤ方向の８０℃における１０％伸長時応力は、６０Ｎ／５ｃｍ以下であり、好ましくは５５Ｎ／５ｃｍ以下であり、より好ましくは５０Ｎ／５ｃｍ以下である。長繊維不織布の１０％伸長時の応力が６０Ｎ／５ｃｍを超えると、形態保持性の優れたフィルター補強材とできるが、任意のひだ数、ひだ間隔にプリーツ加工することが困難となる。１０％伸長時応力の下限は、フィルター補強材に実使用する際にひだ接触、ひだ密着が起こらない剛軟度を有しているものであれば、特に限定されない。なお、本発明における長繊維不織布のＭＤ方向とは、長繊維不織布製造時の製品の流れ方向のことをいう。 The stress at 10% elongation at 80 ° C. in the MD direction of the long fiber nonwoven fabric of Embodiment 1 of the present invention is 60 N / 5 cm or less, preferably 55 N / 5 cm or less, and more preferably 50 N / 5 cm or less. When the stress at 10% elongation of the long fiber non-woven fabric exceeds 60 N / 5 cm, it can be used as a filter reinforcing material having excellent morphological retention, but it becomes difficult to pleate at an arbitrary number of folds and fold intervals. The lower limit of the stress at 10% elongation is not particularly limited as long as it has a rigidity that does not cause fold contact or fold contact when actually used as a filter reinforcing material. The MD direction of the long-fiber non-woven fabric in the present invention refers to the flow direction of the product during the production of the long-fiber non-woven fabric.
本発明の実施形態１の長繊維不織布を構成する繊維の平均繊維径は、３０μｍ以上６０μｍ以下であり、長繊維不織布の目付は５０ｇ／ｍ２以上１２０ｇ／ｍ２以下である。長繊維不織布を構成する繊維の平均繊維径と長繊維不織布の目付の組み合わせは特に限定されるものではないが、目付を小さくする場合は平均繊維径を大きく、目付を大きくする場合は平均繊維径を小さくすることが好ましい。具体的には、目付が５０ｇ／ｍ２以上７０ｇ／ｍ２以下では平均繊維径は５０μｍ以上６０μｍ以下が好ましく、目付が７０ｇ／ｍ２以上９０ｇ／ｍ２以下では平均繊維径は４０μｍ以上５０μｍ以下が好ましく、目付が９０ｇ／ｍ２以上１２０ｇ／ｍ２以下では平均繊維径は３０μｍ以上４０μｍ以下が好ましい。The average fiber diameter of the fibers constituting the long-fiber non-woven fabric of the first embodiment of the present invention is 30 μm or more and 60 μm or less, and the texture of the long-fiber non-woven fabric is 50 g / m 2 or more and 120 g / m 2 or less. The combination of the average fiber diameter of the fibers constituting the long-fiber non-woven fabric and the texture of the long-fiber non-woven fabric is not particularly limited. It is preferable to reduce the size. Specifically, when the basis weight is 50 g / m 2 or more and 70 g / m 2 or less, the average fiber diameter is preferably 50 μm or more and 60 μm or less, and when the basis weight is 70 g / m 2 or more and 90 g / m 2 or less, the average fiber diameter is 40 μm or more and 50 μm or less. The average fiber diameter is preferably 30 μm or more and 40 μm or less when the basis weight is 90 g / m 2 or more and 120 g / m 2 or less.
本発明の実施形態１の長繊維不職布は、８０℃で５．２ｋＰａの圧力下で１０秒プレスした後の折れ角度が１５°以下であり、好ましくは１０°以下であり、より好ましくは５°以下である。折れ角度が１５°を超えると、長繊維不織布の剛性が向上して形態保持性の優れたフィルター補強材とできるが、任意のひだ数、ひだ間隔にプリーツ加工することが困難となる。８０℃で５．２ｋＰａの圧力下で１０秒プレスした後の折れ角度の下限は特に限定しないが、通常は５°以上である。 The long fiber unemployed cloth according to the first embodiment of the present invention has a bending angle of 15 ° or less, preferably 10 ° or less, more preferably 10 ° or less after being pressed at 80 ° C. under a pressure of 5.2 kPa for 10 seconds. It is 5 ° or less. When the folding angle exceeds 15 °, the rigidity of the long-fiber non-woven fabric is improved and a filter reinforcing material having excellent shape retention can be obtained, but it becomes difficult to pleate at an arbitrary number of folds and fold spacing. The lower limit of the bending angle after pressing at 80 ° C. under a pressure of 5.2 kPa for 10 seconds is not particularly limited, but is usually 5 ° or more.
本発明の実施形態１の長繊維不織布を構成する繊維の複屈折率（Δｎ）は、０．００５以上０．０２０以下であり、好ましくは０．００７以上０．０１５以下であり、より好ましくは０．００８以上０．０１２以下である。複屈折率（Δｎ）が０．００５未満になると、長繊維不織布のプリーツ加工性は優れるが繊維が変形して長繊維不織布の剛性が低下するため、フィルター補強材に実使用する際にひだ接触、ひだ密着が起こりやすくなる。複屈折率（Δｎ）が０．０２０を超えると、長繊維不織布の剛性が向上して形態保持性の優れたフィルター補強材とできるが、任意のひだ数、ひだ間隔にプリーツ加工することが困難となる。 The birefringence (Δn) of the fibers constituting the long-fiber non-woven fabric of the first embodiment of the present invention is 0.005 or more and 0.020 or less, preferably 0.007 or more and 0.015 or less, more preferably. It is 0.008 or more and 0.012 or less. When the birefringence (Δn) is less than 0.005, the pleated workability of the long-fiber non-woven fabric is excellent, but the fibers are deformed and the rigidity of the long-fiber non-woven fabric is lowered. , The folds are likely to adhere. When the birefringence (Δn) exceeds 0.020, the rigidity of the long-fiber non-woven fabric is improved and a filter reinforcing material having excellent shape retention can be obtained, but it is difficult to pleat at an arbitrary number of folds and fold spacing. It becomes.
本発明の実施形態１の長繊維不織布の結晶化度は２５％以下であり、好ましくは５％以上２０％以下、より好ましくは１０％以上１５％以下である。結晶化度が２５％を超えると、長繊維不織布の剛性が向上して形態保持性の優れたフィルター補強材とできるが、任意のひだ数、ひだ間隔にプリーツ加工することが困難となる。結晶化度の下限は特に限定しないが、結晶化度が５％未満になると、長繊維不織布の剛性が低下するため、フィルター補強材に実使用する際にひだ接触、ひだ密着が起こりやすくなる。 The crystallinity of the long-fiber non-woven fabric according to the first embodiment of the present invention is 25% or less, preferably 5% or more and 20% or less, and more preferably 10% or more and 15% or less. When the crystallinity exceeds 25%, the rigidity of the long-fiber non-woven fabric is improved and a filter reinforcing material having excellent morphological retention can be obtained, but it becomes difficult to pleate at an arbitrary number of folds and fold intervals. The lower limit of the crystallinity is not particularly limited, but if the crystallinity is less than 5%, the rigidity of the long-fiber non-woven fabric is lowered, so that fold contact and fold contact are likely to occur when actually used as a filter reinforcing material.
本発明の実施形態１の長繊維不織布を構成する繊維は、主成分であるポリエチレンテレフタレートに熱可塑性ポリスチレン系共重合体を混合した樹脂からなる単一繊維であることが好ましい。ポリエチレンテレフタレートは、ポリエチレンやポリプロピレン等の樹脂より機械的強度、耐熱性、保型性等に優れている。このような効果を有効に発揮させるために、本発明の長繊維不織布を構成する繊維に使用する樹脂における主成分であるポリエチレンテレフタレートの含有量は、長繊維不織布全体を１００質量％としたとき、熱可塑性ポリスチレン系共重合体の混合量を考慮すると、好ましくは９０質量％以上９９．８質量％以下、より好ましくは９３質量％以上９９．５質量％以下、さらに好ましくは９４質量％以上９８質量％以下である。なお、１０質量％以下であれば、ポリエチレンテレフタレート以外のポリトリメチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート等のポリエステル樹脂がブレンドされていてもよい。なお、本発明における単一繊維とは、芯鞘複合繊維、サイドバイサイド複合繊維、海島複合繊維などと異なり、２種類の樹脂がブレンドされた状態で繊維化された繊維や通常の１成分樹脂からなる繊維を意味するものである。 The fibers constituting the long-fiber non-woven fabric of the first embodiment of the present invention are preferably single fibers made of a resin obtained by mixing a thermoplastic polystyrene-based copolymer with polyethylene terephthalate as the main component. Polyethylene terephthalate is superior to resins such as polyethylene and polypropylene in mechanical strength, heat resistance, shape retention, and the like. In order to effectively exert such an effect, the content of polyethylene terephthalate, which is the main component in the resin used for the fibers constituting the long-fiber non-woven fabric of the present invention, is 100% by mass when the entire long-fiber non-woven fabric is taken as 100% by mass. Considering the mixing amount of the thermoplastic polystyrene-based copolymer, it is preferably 90% by mass or more and 99.8% by mass or less, more preferably 93% by mass or more and 99.5% by mass or less, and further preferably 94% by mass or more and 98% by mass or less. % Or less. If it is 10% by mass or less, a polyester resin such as polytrimethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate other than polyethylene terephthalate may be blended. The single fiber in the present invention is different from the core-sheath composite fiber, the side-by-side composite fiber, the sea-island composite fiber, etc. It means fiber.
本発明の実施形態１において使用するポリエチレンテレフタレートの固有粘度は、０．３ｄｌ／ｇ以上であることが好ましく、０．４ｄｌ／ｇ以上であることがより好ましく、０．５ｄｌ／ｇ以上であることがさらに好ましく、０．５５ｄｌ／ｇ以上であることが最も好ましい。ポリエチレンテレフタレートの固有粘度を０．３ｄｌ／ｇ以上とすることにより、樹脂が熱劣化しにくくなり、長繊維不織布の耐久性を向上することができる。 The intrinsic viscosity of polyethylene terephthalate used in the first embodiment of the present invention is preferably 0.3 dl / g or more, more preferably 0.4 dl / g or more, and 0.5 dl / g or more. Is more preferable, and 0.55 dl / g or more is most preferable. By setting the intrinsic viscosity of polyethylene terephthalate to 0.3 dl / g or more, the resin is less likely to deteriorate due to heat, and the durability of the long fiber non-woven fabric can be improved.
本発明の実施形態１において使用する熱可塑性ポリスチレン系共重合体は、ガラス転移点温度が１００℃以上１６０℃以下であることが好ましく、１１０℃以上１５５℃以下であることがより好ましく、１２０℃以上１５０℃以下であることがさらに好ましい。また、熱可塑性ポリスチレン系共重合体は、ポリエチレンテレフタレートに非相溶であることが好ましい。ポリエチレンテレフタレートよりガラス転移点温度が高く、１００℃以上であることにより、長繊維不織布を構成する繊維の結晶化を抑制することができる。その効果は、例えば、後述する面拘束加工時の熱付与により、繊維同士を固着させ、さらには熱収縮を抑制して寸法変化の小さい長繊維不職布に加工することができる。一方、ガラス転移点温度は、紡糸生産性を考慮すると１６０℃以下であることが好ましい。ガラス転移点温度は、ＪＩＳ Ｋ７１２２（１９８７）に従って、２０℃／分の昇温速度で測定して求められる値である。 The thermoplastic polystyrene-based copolymer used in the first embodiment of the present invention preferably has a glass transition temperature of 100 ° C. or higher and 160 ° C. or lower, more preferably 110 ° C. or higher and 155 ° C. or lower, and 120 ° C. It is more preferably 150 ° C. or lower. Further, the thermoplastic polystyrene-based copolymer is preferably incompatible with polyethylene terephthalate. When the glass transition point temperature is higher than that of polyethylene terephthalate and is 100 ° C. or higher, crystallization of fibers constituting the long-fiber non-woven fabric can be suppressed. The effect is that, for example, by applying heat during the surface restraint processing described later, the fibers can be fixed to each other, and further, heat shrinkage can be suppressed to process a long fiber unemployed cloth having a small dimensional change. On the other hand, the glass transition temperature is preferably 160 ° C. or lower in consideration of spinning productivity. The glass transition point temperature is a value obtained by measuring at a heating rate of 20 ° C./min according to JIS K7122 (1987).
本発明の実施形態１において使用する熱可塑性ポリスチレン共重合体は、ガラス転移点温度が１００℃以上１６０℃以下であれば特に限定されないが、例えば、スチレン・共役ジエンブロック共重合体、アクリロニトリル・スチレン共重合体、アクリロニトリル・ブタジエン・スチレン共重合体、スチレン・アクリル酸エステル共重合体、またはスチレン・メタクリル酸エステル共重合体が好ましい。このうち、スチレン・アクリル酸エステル共重合体、またはスチレン・メタクリル酸エステル共重合体がより好ましく、スチレン・メタクリル酸エステル共重合体がさらに好ましい。スチレン・メタクリル酸エステル共重合体として、例えば、スチレン・メタクリル酸メチル・無水マレイン酸共重合体が挙げられる。これらは単独でまたは組み合わせて含有しても良い。市販品では、Ｒｏｈｍ ＧｍｂＨ＆Ｃｏ．ＫＧのＰＬＥＸＩＧＬＡＳ ＨＷ５５が挙げられ、少量の添加量で優れた効果を発揮するため特に好ましい。 The thermoplastic polystyrene copolymer used in the first embodiment of the present invention is not particularly limited as long as the glass transition point temperature is 100 ° C. or higher and 160 ° C. or lower. For example, a styrene / conjugated diene block copolymer or acrylonitrile / styrene. Copolymers, acrylonitrile-butadiene-styrene copolymers, styrene-acrylic acid ester copolymers, or styrene-methacrylate copolymers are preferable. Of these, a styrene / acrylic acid ester copolymer or a styrene / methacrylate copolymer is more preferable, and a styrene / methacrylate copolymer is further preferable. Examples of the styrene / methacrylate copolymer include a styrene / methyl methacrylate / maleic anhydride copolymer. These may be contained alone or in combination. Commercially available products include ROHM GmbH & Co. KG's PLEXIGLAS HW55 can be mentioned, which is particularly preferable because it exerts an excellent effect even with a small amount of addition.
熱可塑性ポリスチレン系共重合体の混合量は、長繊維不織布全体を１００質量％としたとき、０．０２質量％以上５質量％以下が好ましく、０．０５質量％以上４質量％以下がより好ましく、０．１質量％以上３質量％以下がさらに好ましい。混合量を０．０２質量％以上とすることにより上記添加の効果が得られる。熱可塑性ポリスチレン系共重合体の混合量の上限は特に制約されるものではないが、過剰に混合するとポリエチレンテレフタレートと熱可塑性ポリスチレン系共重合体との延伸性の違いにより、繊維が破断し、操業性が悪化する。そのために、熱可塑性ポリスチレン系共重合体の混合量は５質量％以下であることが好ましい。 The mixing amount of the thermoplastic polystyrene-based copolymer is preferably 0.02% by mass or more and 5% by mass or less, and more preferably 0.05% by mass or more and 4% by mass or less, when the whole long fiber non-woven fabric is 100% by mass. , 0.1% by mass or more and 3% by mass or less is more preferable. The effect of the above addition can be obtained by setting the mixing amount to 0.02% by mass or more. The upper limit of the mixing amount of the thermoplastic polystyrene-based copolymer is not particularly limited, but if it is excessively mixed, the fibers will break due to the difference in stretchability between the polyethylene terephthalate and the thermoplastic polystyrene-based copolymer, and the operation will be performed. Sex gets worse. Therefore, the mixing amount of the thermoplastic polystyrene-based copolymer is preferably 5% by mass or less.
本発明の実施形態１の長繊維不織布は、面拘束長繊維不織布、なかでも面拘束スパンボンド不織布であることが好ましい。ここでいう面拘束とは、繊維ウェブを厚さ方向に面状に挟んで、面状に圧力をかけることである。面拘束は、例えば、フラットロールと、フェルトベルト、ゴムベルト、スチールベルト等のシート状体によって、繊維ウェブのシート全面をプレス処理することにより行うことができる。そして、本発明では、仮圧着後の繊維ウェブを、面拘束しながら本圧着（熱セット）を行なうが、これは、フラットロールと彫刻ロール、または彫刻ロール同士で圧着を行う部分圧着や、フラットロール同士で圧着を行う線圧着とは異なる。部分圧着の場合は、繊維は部分的に固定されるため、圧着部分に応力が集中して、プリーツ加工し難い長繊維不織布となる。また、線圧着の場合は、全体が過剰に圧着されているため、繊維が変形して剛軟度が低く、圧力損失の高い長繊維不織布となる。一方、面拘束しながら圧着を行えば、繊維ウェブの面内方向の熱収縮を抑制することができる。その結果、得られた面拘束長繊維不織布は、繊維の変形を抑制しつつ、シート全面で繊維が互いに固定化されており、剛軟度が優れたものになる。 The long-fiber non-woven fabric according to the first embodiment of the present invention is preferably a surface-constrained long-fiber non-woven fabric, and more preferably a surface-constrained spunbonded non-woven fabric. The surface restraint referred to here is to sandwich the fiber web in a plane shape in the thickness direction and apply pressure in a plane shape. The surface restraint can be performed by pressing the entire surface of the fiber web sheet with, for example, a flat roll and a sheet-like body such as a felt belt, a rubber belt, or a steel belt. Then, in the present invention, the fiber web after the temporary crimping is subjected to the main crimping (heat setting) while being surface-constrained. It is different from wire crimping, in which rolls are crimped to each other. In the case of partial crimping, since the fibers are partially fixed, stress is concentrated on the crimped portion, resulting in a long-fiber non-woven fabric that is difficult to pleate. Further, in the case of wire crimping, since the whole is crimped excessively, the fibers are deformed to obtain a long fiber non-woven fabric having low rigidity and softness and high pressure loss. On the other hand, if crimping is performed while restraining the surface, heat shrinkage of the fiber web in the in-plane direction can be suppressed. As a result, in the obtained surface-constrained long-fiber non-woven fabric, the fibers are fixed to each other on the entire surface of the sheet while suppressing the deformation of the fibers, and the rigidity and softness are excellent.
本発明の実施形態１の長繊維不織布は、機械的交絡処理が施されていない長繊維不織布であることが好ましい。機械的交絡処理をした長繊維不織布の場合、鋭利にプリーツ状に加工し難い長繊維不織布となるため、好ましくない。また、短繊維で構成された不織布の場合、繊維同士の滑り等による局所的な変形が起こり、均等なひだ間隔で加工することが困難となる。 The long-fiber non-woven fabric according to the first embodiment of the present invention is preferably a long-fiber non-woven fabric that has not been subjected to mechanical entanglement treatment. A long-fiber non-woven fabric that has been mechanically entangled is not preferable because it is a long-fiber non-woven fabric that is difficult to be sharply pleated. Further, in the case of a non-woven fabric composed of short fibers, local deformation occurs due to slippage between the fibers, and it becomes difficult to process the non-woven fabric at uniform fold intervals.
本発明の実施形態１の長繊維不織布の製造方法は、引取り速度と吐出線速度の比（以下、「ドラフト比」という）を２００以下で紡糸する工程、および紡糸後に得られた繊維ウェブを仮圧着した後に、面拘束しながら本圧着する工程を含むものである。 The method for producing a long-fiber non-woven fabric according to the first embodiment of the present invention is a step of spinning a ratio of a take-up speed to a discharge line speed (hereinafter referred to as "draft ratio") of 200 or less, and a fiber web obtained after spinning. This includes a step of temporarily crimping and then main crimping while restraining the surface.
まず、常法に従って所定量のポリエチレンテレフタレートと熱可塑性ポリスチレン系共重合体をブレンド乾燥した後に、溶融紡糸機にて紡糸を行なう。 First, a predetermined amount of polyethylene terephthalate and a thermoplastic polystyrene-based copolymer are blended and dried according to a conventional method, and then spinning is performed with a melt spinning machine.
本発明の実施形態１では、好適な複屈折率（Δｎ）を有する長繊維不織布とするために、ドラフト比を２００以下にすることが好ましい。ドラフト比が２００を超えると、長繊維不織布を構成する繊維の結晶化度が高くなり、プリーツ加工し難い長繊維不織布となる。ドラフト比は、１７５以下がより好ましく、１５０以下がさらに好ましい。 In the first embodiment of the present invention, the draft ratio is preferably 200 or less in order to obtain a long-fiber non-woven fabric having a suitable birefringence (Δn). When the draft ratio exceeds 200, the crystallinity of the fibers constituting the long-fiber non-woven fabric becomes high, and the long-fiber non-woven fabric is difficult to pleat. The draft ratio is more preferably 175 or less, and even more preferably 150 or less.
ドラフト比は、以下の式で与えられる。
（引取り速度と吐出線速度の比）
ドラフト比（Ψ）＝引取り速度（Ｖｓ）／吐出線速度（Ｖ０）
（吐出線速度）
吐出線速度（Ｖ０）＝単孔吐出量（Ｑ）／紡糸口金孔断面積（Ｄａ）The draft ratio is given by the following formula.
(Ratio of take-up speed and discharge line speed)
Draft ratio (Ψ) = Pick-up speed (Vs) / Discharge line speed (V 0 )
(Discharge line speed)
Discharge line velocity (V 0 ) = Single hole discharge amount (Q) / Spinner hole cross-sectional area (Da)
その他の紡糸条件は、特に限定されないが、紡糸口金より紡出し、エジェクタに０．３ｋｇ／ｃｍ２以上２．０ｋｇ／ｃｍ２以下の圧力（ジェット圧）で乾燥エアを供給し、延伸することが好ましい。また、乾燥エアの供給圧力を上記範囲に制御することにより、引取り速度を所望の範囲に制御しやすくなると共に、適度に乾燥させることができる。Other spinning conditions are not particularly limited, and spun from a spinneret, supplying dry air ejector to 0.3 kg / cm 2 or more 2.0 kg / cm 2 or less pressure (jet pressure), it is stretched preferable. Further, by controlling the supply pressure of the drying air within the above range, it becomes easy to control the take-up speed within a desired range, and the drying can be performed appropriately.
次いで、吐出糸条を冷却し、下方のコンベア上へ繊維を開繊させつつ捕集して、繊維ウェブ（長繊維フリース）を得れば良い。 Next, the discharged yarn may be cooled, and the fibers may be collected while being opened on the lower conveyor to obtain a fiber web (long fiber fleece).
得られた繊維ウェブに対して、通常のスパンボンド不織布の製造方法では、フラットロールと彫刻ロールや、彫刻ロール同士の部分圧着を行うエンボス加工等が施される。しかし、本発明の実施形態１のように低紡糸速度で紡糸して得られた繊維ウェブは、低配向であり収縮しやすいため、エンボス加工等を施すと幅入りや皺などの問題が生じる。本発明では、以下の通り、仮圧着を行って、その後に面拘束しながら本圧着を行うことにより、幅入りや皺等の発生を抑制しやすくすることができる。 In the usual method for producing a spunbonded non-woven fabric, the obtained fiber web is embossed with a flat roll and an engraving roll, or a partial crimp between the engraving rolls. However, the fiber web obtained by spinning at a low spinning speed as in the first embodiment of the present invention has a low orientation and easily shrinks, so that embossing or the like causes problems such as width formation and wrinkles. In the present invention, as described below, by performing temporary crimping and then performing main crimping while restraining the surface, it is possible to easily suppress the occurrence of width formation, wrinkles, and the like.
仮圧着は、繊維ウェブを、厚さ方向に圧力をかけて圧着することである。仮圧着は、本圧着における面拘束を行いやすくするために行うものであり、例えば、２つのフラットロールからなる１対の仮熱圧着ロールを用い、それぞれの表面温度を６０℃以上１４０℃以下とし、押し圧を５ｋＮ／ｍ以上３０ｋＮ／ｍ以下として、熱圧着すれば良い。フラットロールの表面温度は、７０℃以上１２０℃以下とするのがより好ましいく、押し圧は、７ｋＮ／ｍ以上２０ｋＮ／ｍ以下とするのがより好ましい。 Temporary crimping is the crimping of a fiber web by applying pressure in the thickness direction. Temporary crimping is performed to facilitate surface restraint in main crimping. For example, a pair of temporary thermocompression bonding rolls composed of two flat rolls is used, and the surface temperature of each is set to 60 ° C. or higher and 140 ° C. or lower. The pressing pressure may be 5 kN / m or more and 30 kN / m or less, and thermocompression bonding may be performed. The surface temperature of the flat roll is more preferably 70 ° C. or higher and 120 ° C. or lower, and the pressing pressure is more preferably 7 kN / m or higher and 20 kN / m or lower.
さらに、本圧着しやすくする目的で、仮圧着後の繊維ウェブに対して、含水率が１質量％以上３０質量％以下となるように水をスプレーにより吹き付ける含水加工を実施してもよい。 Further, for the purpose of facilitating the main crimping, the fiber web after the temporary crimping may be subjected to a water content treatment by spraying water so that the water content is 1% by mass or more and 30% by mass or less.
次に、本圧着を行なう。本圧着は、仮圧着後の繊維ウェブを、面拘束しながら、熱セットを行なって圧着することである。面拘束は、上述の通り、フラットロールと、フェルトベルト、ゴムベルト、スチールベルト等のシート状体を用いて行なうことが好ましい。このうち、フェルトベルトは、表面が繊維状であり繊維ウェブを面内方向に拘束しやすいため、特に好ましい。さらに、面拘束しながら本圧着を行えば、各繊維がシート全面で固定化されるため、繊維の変形を抑制しつつ、剛軟度が優れたものになる。 Next, the main crimping is performed. This crimping is to heat-set and crimp the fiber web after temporary crimping while restraining the surface. As described above, the surface restraint is preferably performed by using a flat roll and a sheet-like body such as a felt belt, a rubber belt, or a steel belt. Of these, the felt belt is particularly preferable because the surface is fibrous and the fiber web is easily restrained in the in-plane direction. Further, if the main crimping is performed while restraining the surface, each fiber is fixed on the entire surface of the sheet, so that the fiber has excellent rigidity and softness while suppressing deformation.
熱セットおよび面拘束は、ロールの表面温度を１２０℃以上１８０℃以下として、押し圧を１０ｋＰａ以上４００ｋＰａ以下、加工時間を３秒以上３０秒以下、加工速度を１ｍ／分以上３０ｍ／分以下の条件で行なうことが好ましい。 For heat setting and surface restraint, the surface temperature of the roll is 120 ° C. or more and 180 ° C. or less, the pressing pressure is 10 kPa or more and 400 kPa or less, the processing time is 3 seconds or more and 30 seconds or less, and the processing speed is 1 m / min or more and 30 m / min or less. It is preferable to carry out under the conditions.
ロールの表面温度は、１２０℃以上とすることにより、圧着しやすくなるため、好ましく、１３０℃以上とするのがより好ましい。一方、ロールの表面温度は、１８０℃以下とすることにより、過剰に圧着しにくくなるため、好ましく、１６０℃以下とするのがより好ましい。 The surface temperature of the roll is preferably 120 ° C. or higher because it facilitates crimping, and more preferably 130 ° C. or higher. On the other hand, the surface temperature of the roll is preferably 180 ° C. or lower because it is difficult to excessively crimp the roll, and more preferably 160 ° C. or lower.
押し圧は、１０ｋＰａ以上とすることにより、面拘束しやすくなるため、好ましく、３０ｋＰａ以上がより好ましく、５０ｋＰａ以上がさらに好ましく、１００ｋＰａ以上が特に好ましく、２００ｋＰａ以上が最も好ましい。一方、押し圧は、４００ｋＰａ以下とすることにより、過剰に圧着しにくくなるため、好ましく、３５０ｋＰａ以下がより好ましく、３００ｋＰａ以下がさらに好ましい。 When the pressing pressure is 10 kPa or more, the surface is easily constrained, so it is preferable, 30 kPa or more is more preferable, 50 kPa or more is further preferable, 100 kPa or more is particularly preferable, and 200 kPa or more is most preferable. On the other hand, when the pressing pressure is 400 kPa or less, it becomes difficult to excessively crimp, so it is preferable, 350 kPa or less is more preferable, and 300 kPa or less is further preferable.
加工時間は、３秒以上とすることにより、圧着しやすくなるため好ましく、５秒以上とすることがより好ましい。一方、加工時間は、３５秒以下とすることにより、過剰に圧着しにくくなるため好ましく、２０秒以下とすることがより好ましく、１５秒以下とすることがさらに好ましい。 The processing time is preferably 3 seconds or more because it facilitates crimping, and more preferably 5 seconds or more. On the other hand, the processing time is preferably 35 seconds or less because it is difficult to excessively crimp, more preferably 20 seconds or less, and further preferably 15 seconds or less.
加工速度を好ましくは１ｍ／分以上とすることにより、過剰に圧着しにくくなる。より好ましくは５ｍ／分以上である。一方、加工速度を好ましくは３０ｍ／分以下とすることにより、圧着しやすくなる。より好ましくは２０ｍ／分以下である。 By setting the processing speed to preferably 1 m / min or more, it becomes difficult to excessively crimp. More preferably, it is 5 m / min or more. On the other hand, when the processing speed is preferably 30 m / min or less, crimping becomes easy. More preferably, it is 20 m / min or less.
本圧着の加工温度（ロールの表面温度）と加工時間の組み合わせは特に限定されるものではないが、好適な経方向の伸長時の応力を有する長繊維不織布とするために、加工温度を低くする場合は加工時間を長く、加工温度を高くする場合は加工時間を小さくすることが好ましい。具体的には、加工温度が１２０℃以上１４０℃未満では加工時間は２０秒以上３５秒以下が好ましく、加工温度が１４０℃以上１６０℃未満では加工時間は１０秒以上２５秒以下が好ましく、加工温度が１６０℃以上１９０℃以下では加工時間は３秒以上１５秒以下が好ましい。 The combination of the processing temperature (roll surface temperature) and the processing time of the main crimping is not particularly limited, but the processing temperature is lowered in order to obtain a long-fiber non-woven fabric having a suitable stress during elongation in the warp direction. In this case, it is preferable to lengthen the machining time, and when raising the machining temperature, it is preferable to shorten the machining time. Specifically, when the processing temperature is 120 ° C. or more and less than 140 ° C., the processing time is preferably 20 seconds or more and 35 seconds or less, and when the processing temperature is 140 ° C. or more and less than 160 ° C., the processing time is preferably 10 seconds or more and 25 seconds or less. When the temperature is 160 ° C. or higher and 190 ° C. or lower, the processing time is preferably 3 seconds or more and 15 seconds or less.
このようにして得られた本発明の実施形態１の長繊維不織布は、プリーツ加工性とプリーツ形態保持性に優れた、フィルター補強材の使用に好適なものとなる。 The long-fiber non-woven fabric of the first embodiment of the present invention thus obtained is suitable for use of a filter reinforcing material having excellent pleating processability and pleating shape retention.
＜実施形態２＞
実施形態２として、上記［２］〜[５]の構成を備える長繊維不織布および上記［６］の構成を備えるフィルター補強材について詳細に説明する。<Embodiment 2>
As the second embodiment, the long-fiber non-woven fabric having the constitutions [2] to [5] and the filter reinforcing material having the constitution [6] will be described in detail.
本発明者らは、濾材との貼り合わせ性とプリーツ加工性に優れたフィルター補強材に適した長繊維不職布を得るために鋭意検討した。その結果、一方の表面の表面粗さが２．５以下、もう一方の表面の表面粗さが３．５以上である長繊維不織布を利用することでフィルター補強材に適した長繊維不職布が得られることを見出した。 The present inventors have diligently studied to obtain a long-fiber unemployed cloth suitable for a filter reinforcing material having excellent adhesiveness to a filter medium and pleating workability. As a result, a long-fiber non-woven fabric suitable for a filter reinforcing material is used by using a long-fiber non-woven fabric having a surface roughness of one surface of 2.5 or less and a surface roughness of the other surface of 3.5 or more. Was found to be obtained.
本発明の実施形態２の長繊維不織布を構成する繊維は、平均繊維径が３０μｍ以上６０μｍ以下であり、長繊維不織布の目付は５０ｇ／ｍ２以上１２０ｇ／ｍ２以下である。長繊維不織布を構成する繊維の平均繊維径と長繊維不織布の目付の組み合わせは特に限定されるものではないが、目付を小さくする場合は平均繊維径を大きく、目付を大きくする場合は平均繊維径を小さくすることが好ましい。具体的には、目付が５０ｇ／ｍ２以上７０ｇ／ｍ２以下では平均繊維径が５０μｍ以上６０μｍ以下が好ましく、目付が７０ｇ／ｍ２を超えて９０ｇ／ｍ２以下では平均繊維径は４０μｍ以上５０μｍ未満が好ましく、目付が９０ｇ／ｍ２を超えて１２０ｇ／ｍ２以下では平均繊維径は３０μｍ以上４０μｍ未満が好ましい。The fibers constituting the long-fiber non-woven fabric of the second embodiment of the present invention have an average fiber diameter of 30 μm or more and 60 μm or less, and the long-fiber non-woven fabric has a texture of 50 g / m 2 or more and 120 g / m 2 or less. The combination of the average fiber diameter of the fibers constituting the long-fiber non-woven fabric and the texture of the long-fiber non-woven fabric is not particularly limited. It is preferable to reduce the size. Specifically, when the basis weight is 50 g / m 2 or more and 70 g / m 2 or less, the average fiber diameter is preferably 50 μm or more and 60 μm or less, and when the basis weight is more than 70 g / m 2 and 90 g / m 2 or less, the average fiber diameter is 40 μm or more. It is preferably less than 50 μm, and when the basis weight is more than 90 g / m 2 and 120 g / m 2 or less, the average fiber diameter is preferably 30 μm or more and less than 40 μm.
本発明の実施形態２の長繊維不織布の一方の表面の表面粗さは２．５以下であり、好ましくは２．０以下であ、もう一方の表面の表面粗さは３．５以上であり、好ましくは４．０以上である。一方の表面の表面粗さが２．５以下であると長繊維不織布の平滑性が良好で濾材との貼り合わせ性が良く、剥がれや浮きなどが発生しない。また、もう一方の表面の表面粗さは３．５以上であると長繊維不織布の平滑性が悪くなり、プリーツ加工時に上下する歯の食い込み時に滑りが発生しにくく、良好なひだ形状が得られやすい。 The surface roughness of one surface of the long fiber nonwoven fabric of the second embodiment of the present invention is 2.5 or less, preferably 2.0 or less, and the surface roughness of the other surface is 3.5 or more. , Preferably 4.0 or more. When the surface roughness of one surface is 2.5 or less, the smoothness of the long-fiber non-woven fabric is good, the adhesiveness with the filter medium is good, and peeling or floating does not occur. Further, if the surface roughness of the other surface is 3.5 or more, the smoothness of the long-fiber non-woven fabric deteriorates, slippage does not easily occur when the teeth move up and down during pleating, and a good fold shape can be obtained. Cheap.
本発明の実施形態２の長繊維不織布を構成する繊維は、複屈折率（Δｎ）が好ましくは０．００５以上０．０２０以下であり、より好ましくは０．００７以上０．０１５以下であり、さらに好ましくは０．００８以上０．０１２以下である。複屈折率（Δｎ）が０．００５未満になると、長繊維不織布のプリーツ加工性は優れるが繊維が変形して長繊維不織布の剛性が低下するため、フィルター補強材に実使用する際にひだ接触、ひだ密着が起こりやすくなる。複屈折率（Δｎ）が０．０２０を超えると、長繊維不織布の剛性が向上して形態保持性の優れたフィルター補強材とできるが、任意のひだ数、ひだ間隔にプリーツ加工することが困難となる。 The fibers constituting the long-fiber non-woven fabric of the second embodiment of the present invention have a birefringence (Δn) of preferably 0.005 or more and 0.020 or less, and more preferably 0.007 or more and 0.015 or less. More preferably, it is 0.008 or more and 0.012 or less. When the birefringence (Δn) is less than 0.005, the pleated workability of the long-fiber non-woven fabric is excellent, but the fibers are deformed and the rigidity of the long-fiber non-woven fabric is lowered. , The folds are likely to adhere. When the birefringence (Δn) exceeds 0.020, the rigidity of the long-fiber non-woven fabric is improved and a filter reinforcing material having excellent shape retention can be obtained, but it is difficult to pleat at an arbitrary number of folds and fold spacing. It becomes.
本発明の実施形態２の長繊維不織布を構成する繊維は、主成分であるポリエチレンテレフタレートに熱可塑性ポリスチレン系共重合体を混合した樹脂からなる単一繊維であることが好ましい。ポリエチレンテレフタレートは、ポリエチレンやポリプロピレン等の樹脂より機械的強度、耐熱性、保型性等に優れている。このような効果を有効に発揮させるために、本発明の長繊維不織布を構成する繊維に使用する樹脂における主成分であるポリエチレンテレフタレートの含有量は、長繊維不織布全体を１００質量％としたとき、熱可塑性ポリスチレン系共重合体の混合量を考慮すると、好ましくは９０質量％以上９９．８質量％以下、より好ましくは９３質量％以上９９．５質量％以下、さらに好ましくは９４質量％以上９８質量％以下である。なお、１０質量％以下であれば、ポリエチレンテレフタレート以外のポリトリメチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート等のポリエステル樹脂がブレンドされていてもよい。なお、本発明における単一繊維とは、芯鞘複合繊維、サイドバイサイド複合繊維、海島複合繊維などと異なり、２種類の樹脂がブレンドされた状態で繊維化された繊維や通常の１成分樹脂からなる繊維を意味するものである。 The fibers constituting the long-fiber non-woven fabric of the second embodiment of the present invention are preferably single fibers made of a resin obtained by mixing a thermoplastic polystyrene-based copolymer with polyethylene terephthalate as the main component. Polyethylene terephthalate is superior to resins such as polyethylene and polypropylene in mechanical strength, heat resistance, shape retention, and the like. In order to effectively exert such an effect, the content of polyethylene terephthalate, which is the main component in the resin used for the fibers constituting the long-fiber non-woven fabric of the present invention, is 100% by mass when the entire long-fiber non-woven fabric is taken as 100% by mass. Considering the mixing amount of the thermoplastic polystyrene-based copolymer, it is preferably 90% by mass or more and 99.8% by mass or less, more preferably 93% by mass or more and 99.5% by mass or less, and further preferably 94% by mass or more and 98% by mass or less. % Or less. If it is 10% by mass or less, a polyester resin such as polytrimethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate other than polyethylene terephthalate may be blended. The single fiber in the present invention is different from the core-sheath composite fiber, the side-by-side composite fiber, the sea-island composite fiber, etc. It means fiber.
本発明の実施形態２において使用するポリエチレンテレフタレートの固有粘度は、好ましくは０．３ｄｌ／ｇ以上であり、より好ましくは０．４ｄｌ／ｇ以上であり、さらに好ましくは０．５ｄｌ／ｇ以上であり、特に好ましくは０．５５ｄｌ／ｇ以上である。ポリエチレンテレフタレートの固有粘度を０．３ｄｌ／ｇ以上とすることにより、樹脂が熱劣化しにくくなり、長繊維不織布の耐久性を向上することができる。 The intrinsic viscosity of polyethylene terephthalate used in the second embodiment of the present invention is preferably 0.3 dl / g or more, more preferably 0.4 dl / g or more, and further preferably 0.5 dl / g or more. , Particularly preferably 0.55 dl / g or more. By setting the intrinsic viscosity of polyethylene terephthalate to 0.3 dl / g or more, the resin is less likely to deteriorate due to heat, and the durability of the long fiber non-woven fabric can be improved.
本発明の実施形態２において使用する熱可塑性ポリスチレン系共重合体は、好ましくはガラス転移点温度が１００℃以上１６０℃以下であり、より好ましくは１１０℃以上１５５℃以下であり、さらに好ましくは１２０℃以上１５０℃以下である。また、熱可塑性ポリスチレン系共重合体は、ポリエチレンテレフタレートに非相溶であることが好ましい。ポリエチレンテレフタレートよりガラス転移点温度が高く、１００℃以上であることにより、長繊維不織布を構成する繊維の結晶化を抑制することができる。その効果は、例えば、後述する面拘束加工時の熱付与により、繊維同士を固着させ、さらには熱収縮を抑制して寸法変化の小さい長繊維不職布に加工することができる。一方、ガラス転移点温度は、紡糸生産性を考慮すると好ましくは１６０℃以下である。ガラス転移点温度は、ＪＩＳ Ｋ７１２２（１９８７）に従って、２０℃／分の昇温速度で測定して求められる値である。 The thermoplastic polystyrene-based copolymer used in the second embodiment of the present invention preferably has a glass transition temperature of 100 ° C. or higher and 160 ° C. or lower, more preferably 110 ° C. or higher and 155 ° C. or lower, and further preferably 120 ° C. It is ℃ or more and 150 ℃ or less. Further, the thermoplastic polystyrene-based copolymer is preferably incompatible with polyethylene terephthalate. When the glass transition point temperature is higher than that of polyethylene terephthalate and is 100 ° C. or higher, crystallization of fibers constituting the long-fiber non-woven fabric can be suppressed. The effect is that, for example, by applying heat during the surface restraint processing described later, the fibers can be fixed to each other, and further, heat shrinkage can be suppressed to process a long fiber unemployed cloth having a small dimensional change. On the other hand, the glass transition temperature is preferably 160 ° C. or lower in consideration of spinning productivity. The glass transition point temperature is a value obtained by measuring at a heating rate of 20 ° C./min according to JIS K7122 (1987).
本発明の実施形態２において使用する熱可塑性ポリスチレン共重合体は、ガラス転移点温度が１００℃以上１６０℃以下であれば特に限定されないが、例えば、スチレン・共役ジエンブロック共重合体、アクリロニトリル・スチレン共重合体、アクリロニトリル・ブタジエン・スチレン共重合体、スチレン・アクリル酸エステル共重合体、またはスチレン・メタクリル酸エステル共重合体が好ましい。このうち、スチレン・アクリル酸エステル共重合体、またはスチレン・メタクリル酸エステル共重合体がより好ましく、スチレン・メタクリル酸エステル共重合体がさらに好ましい。スチレン・メタクリル酸エステル共重合体として、例えばスチレン・メタクリル酸メチル・無水マレイン酸共重合体が挙げられる。これらは単独でまたは組み合わせて含有しても良い。市販品では、Ｒｏｈｍ ＧｍｂＨ＆Ｃｏ．ＫＧのＰＬＥＸＩＧＬＡＳ ＨＷ５５が挙げられ、少量の添加量で優れた効果を発揮するため特に好ましい。 The thermoplastic polystyrene copolymer used in the second embodiment of the present invention is not particularly limited as long as the glass transition point temperature is 100 ° C. or higher and 160 ° C. or lower. For example, a styrene / conjugated diene block copolymer or acrylonitrile / styrene. Copolymers, acrylonitrile-butadiene-styrene copolymers, styrene-acrylic acid ester copolymers, or styrene-methacrylate copolymers are preferable. Of these, a styrene / acrylic acid ester copolymer or a styrene / methacrylate copolymer is more preferable, and a styrene / methacrylate copolymer is further preferable. Examples of the styrene / methacrylate copolymer include a styrene / methyl methacrylate / maleic anhydride copolymer. These may be contained alone or in combination. Commercially available products include ROHM GmbH & Co. KG's PLEXIGLAS HW55 can be mentioned, which is particularly preferable because it exerts an excellent effect even with a small amount of addition.
熱可塑性ポリスチレン系共重合体の混合量は、長繊維不織布全体を１００質量％としたとき、好ましくは０．０２質量％以上５質量％以下であり、より好ましくは０．０５質量％以上４質量％以下であり、さらに好ましくは０．１質量％以上３質量％以下である。混合量を０．０２質量％以上とすることにより上記添加の効果が得られる。熱可塑性ポリスチレン系共重合体の混合量の上限は特に制約されるものではないが、過剰に混合するとポリエチレンテレフタレートと熱可塑性ポリスチレン系共重合体との延伸性の違いにより、繊維が破断し、操業性が悪化する。そのために、熱可塑性ポリスチレン系共重合体の混合量は５質量％以下であることが好ましい。 The mixing amount of the thermoplastic polystyrene-based copolymer is preferably 0.02% by mass or more and 5% by mass or less, and more preferably 0.05% by mass or more and 4% by mass, when the whole long fiber non-woven fabric is 100% by mass. % Or less, more preferably 0.1% by mass or more and 3% by mass or less. The effect of the above addition can be obtained by setting the mixing amount to 0.02% by mass or more. The upper limit of the mixing amount of the thermoplastic polystyrene-based copolymer is not particularly limited, but if it is excessively mixed, the fibers will break due to the difference in stretchability between the polyethylene terephthalate and the thermoplastic polystyrene-based copolymer, and the operation will be performed. Sex gets worse. Therefore, the mixing amount of the thermoplastic polystyrene-based copolymer is preferably 5% by mass or less.
本発明の実施形態２の長繊維不織布は、面拘束長繊維不織布、なかでも面拘束スパンボンド不織布であることが好ましい。ここでいう面拘束とは、繊維ウェブを厚さ方向に面状に挟んで、面状に圧力をかけることである。面拘束は、例えば、フラットロールと、樹脂ベルト、フェルトベルト、ゴムベルト、スチールベルト等の不織布の片面に微細な凹凸が転写されるシート状体によって、繊維ウェブのシート全面をプレス処理することにより行うことができる。そして、本発明では、仮圧着後の繊維ウェブを、面拘束しながら本圧着（熱セット）を行なうが、これは、フラットロールと彫刻ロール、または彫刻ロール同士で圧着を行う部分圧着や、フラットロール同士で圧着を行う線圧着とは異なる。部分圧着の場合は、不織布片面に凹凸が転写されるが、微細な凹凸ではないため、プリーツ加工時に上下する歯の食い込み時に滑りが生じてプリーツ加工性が悪い。また、繊維は部分的に固定されるため、圧着部分に応力が集中して、プリーツ加工し難い長繊維不織布となる。また、線圧着の場合は、不織布両面が平滑となるため、プリーツ加工時に上下する歯の食い込み時に滑りが生じて、ひだ形状が悪くなり易い。また、全体が過剰に圧着されているため、繊維が変形して剛軟度が低く、圧力損失の高い長繊維不織布となる。一方、面拘束しながら圧着を行えば、繊維ウェブの面内方向の熱収縮を抑制することができる。その結果、得られた面拘束長繊維不織布は、繊維の変形を抑制しつつ、シート全面で繊維が互いに固定化されており、剛軟度が優れたものになる。 The long-fiber non-woven fabric of the second embodiment of the present invention is preferably a surface-constrained long-fiber non-woven fabric, and more preferably a surface-constrained spunbonded non-woven fabric. The surface restraint referred to here is to sandwich the fiber web in a plane shape in the thickness direction and apply pressure in a plane shape. Surface restraint is performed by pressing the entire surface of the fiber web sheet with, for example, a flat roll and a sheet-like body in which fine irregularities are transferred to one side of a non-woven fabric such as a resin belt, felt belt, rubber belt, or steel belt. be able to. Then, in the present invention, the fiber web after the temporary crimping is subjected to the main crimping (heat setting) while being surface-constrained. It is different from wire crimping, in which rolls are crimped to each other. In the case of partial crimping, unevenness is transferred to one side of the non-woven fabric, but since it is not fine unevenness, slippage occurs when the teeth that move up and down during pleating are bitten, resulting in poor pleating workability. Further, since the fibers are partially fixed, stress is concentrated on the pressure-bonded portion, resulting in a long-fiber non-woven fabric that is difficult to pleate. Further, in the case of wire crimping, since both sides of the non-woven fabric are smooth, slippage occurs when the teeth that move up and down during pleating are bitten, and the fold shape tends to deteriorate. Further, since the whole is excessively pressure-bonded, the fibers are deformed to obtain a long-fiber non-woven fabric having low rigidity and high softness and high pressure loss. On the other hand, if crimping is performed while restraining the surface, heat shrinkage of the fiber web in the in-plane direction can be suppressed. As a result, in the obtained surface-constrained long-fiber non-woven fabric, the fibers are fixed to each other on the entire surface of the sheet while suppressing the deformation of the fibers, and the rigidity and softness are excellent.
本発明の実施形態２の長繊維不織布は、機械的交絡処理が施されていない長繊維不織布であることが好ましい。機械的交絡処理をした長繊維不織布の場合、鋭利にプリーツ状に加工し難い長繊維不織布となる。また、短繊維で構成された不織布の場合、繊維同士の滑り等による局所的な変形が起こり、均等なひだ間隔で加工することが困難となる。 The long-fiber non-woven fabric according to the second embodiment of the present invention is preferably a long-fiber non-woven fabric that has not been subjected to mechanical entanglement treatment. In the case of a long-fiber non-woven fabric that has been mechanically entangled, it becomes a long-fiber non-woven fabric that is difficult to be sharply processed into a pleated shape. Further, in the case of a non-woven fabric composed of short fibers, local deformation occurs due to slippage between the fibers, and it becomes difficult to process the non-woven fabric at uniform fold intervals.
本発明の実施形態２の長繊維不織布の製造方法は、紡糸する工程、および紡糸後に得られた繊維ウェブを仮圧着した後に、面拘束しながら本圧着する工程を含むものである。 The method for producing a long-fiber non-woven fabric according to the second embodiment of the present invention includes a step of spinning and a step of temporarily crimping a fiber web obtained after spinning and then main crimping while restraining the surface.
まず、常法に従って所定量のポリエチレンテレフタレートと熱可塑性ポリスチレン系共重合体をブレンド乾燥した後に、溶融紡糸機にて紡糸を行なう。 First, a predetermined amount of polyethylene terephthalate and a thermoplastic polystyrene-based copolymer are blended and dried according to a conventional method, and then spinning is performed with a melt spinning machine.
その他の紡糸条件は、特に限定されないが、紡糸口金より紡出し、エジェクタに０．３ｋｇ／ｃｍ２以上２．０ｋｇ／ｃｍ２以下の圧力（ジェット圧）で乾燥エアを供給し、延伸することが好ましい。また、乾燥エアの供給圧力を上記範囲に制御することにより、引取り速度を所望の範囲に制御しやすくなると共に、適度に乾燥させることができる。Other spinning conditions are not particularly limited, and spun from a spinneret, supplying dry air ejector to 0.3 kg / cm 2 or more 2.0 kg / cm 2 or less pressure (jet pressure), it is stretched preferable. Further, by controlling the supply pressure of the drying air within the above range, it becomes easy to control the take-up speed within a desired range, and the drying can be performed appropriately.
次いで、吐出糸条を冷却し、下方のコンベア上へ繊維を開繊させつつ捕集して、繊維ウェブ（長繊維フリース）を得れば良い。 Next, the discharged yarn may be cooled, and the fibers may be collected while being opened on the lower conveyor to obtain a fiber web (long fiber fleece).
本発明の実施形態２のように低紡糸速度で紡糸して得られた繊維ウェブは、低配向であり収縮しやすいため、エンボス加工等を施すと幅入りや皺などの問題が生じる。本発明では、以下の通り、仮圧着を行って、その後に面拘束しながら本圧着を行うことにより、幅入りや皺等の発生を抑制しやすくすることができる。 The fiber web obtained by spinning at a low spinning speed as in the second embodiment of the present invention has a low orientation and easily shrinks, so that embossing or the like causes problems such as width formation and wrinkles. In the present invention, as described below, by performing temporary crimping and then performing main crimping while restraining the surface, it is possible to easily suppress the occurrence of width formation, wrinkles, and the like.
仮圧着は、繊維ウェブを、厚さ方向に圧力をかけて圧着することである。仮圧着は、本圧着における面拘束を行いやすくするために行うものであり、例えば、２つのフラットロールからなる１対の仮熱圧着ロールを用い、それぞれの表面温度を６０℃以上１４０℃以下とし、押し圧を５ｋＮ／ｍ以上３０ｋＮ／ｍ以下として、熱圧着すれば良い。フラットロールの表面温度は、７０℃以上１２０℃以下とするのがより好ましいく、押し圧は、７ｋＮ／ｍ以上２０ｋＮ／ｍ以下とするのがより好ましい。 Temporary crimping is the crimping of a fiber web by applying pressure in the thickness direction. Temporary crimping is performed to facilitate surface restraint in main crimping. For example, a pair of temporary thermocompression bonding rolls composed of two flat rolls is used, and the surface temperature of each is set to 60 ° C. or higher and 140 ° C. or lower. The pressing pressure may be 5 kN / m or more and 30 kN / m or less, and thermocompression bonding may be performed. The surface temperature of the flat roll is more preferably 70 ° C. or higher and 120 ° C. or lower, and the pressing pressure is more preferably 7 kN / m or higher and 20 kN / m or lower.
さらに、本圧着しやすくする目的で、仮圧着後の繊維ウェブに対して、含水率が１質量％以上３０質量％以下となるように水をスプレーにより吹き付ける含水加工を実施してもよい。 Further, for the purpose of facilitating the main crimping, the fiber web after the temporary crimping may be subjected to a water content treatment by spraying water so that the water content is 1% by mass or more and 30% by mass or less.
次に、本圧着を行なう。本圧着は、仮圧着後の繊維ウェブを、面拘束しながら、熱セットを行なって圧着することである。面拘束は、上述の通り、フラットロールと、樹脂ベルト、フェルトベルト、ゴムベルト、スチールベルト等のシート状体を用いて行なうことが好ましい。このうち、フェルトベルトは、表面が繊維状であり繊維ウェブを面内方向に拘束しやすいため、特に好ましい。さらに、面拘束しながら本圧着を行えば、各繊維がシート全面で固定化されるため、繊維の変形を抑制しつつ、剛軟度が優れたものになる。 Next, the main crimping is performed. This crimping is to heat-set and crimp the fiber web after temporary crimping while restraining the surface. As described above, the surface restraint is preferably performed by using a flat roll and a sheet-like body such as a resin belt, a felt belt, a rubber belt, or a steel belt. Of these, the felt belt is particularly preferable because the surface is fibrous and the fiber web is easily restrained in the in-plane direction. Further, if the main crimping is performed while restraining the surface, each fiber is fixed on the entire surface of the sheet, so that the fiber has excellent rigidity and softness while suppressing deformation.
熱セット、および面拘束は、ロールの表面温度を１２０℃以上１８０℃以下として、押し圧を１０ｋＰａ以上４００ｋＰａ以下、加工時間を３秒以上３０秒以下、加工速度を１ｍ／分以上３０ｍ／分以下の条件で行なうことが好ましい。 For heat setting and surface restraint, the surface temperature of the roll is 120 ° C. or more and 180 ° C. or less, the pressing pressure is 10 kPa or more and 400 kPa or less, the processing time is 3 seconds or more and 30 seconds or less, and the processing speed is 1 m / min or more and 30 m / min or less. It is preferable to carry out under the conditions of.
ロールの表面温度は、１２０℃以上とすることにより、圧着しやすくなるため、好ましく、１３０℃以上とするのがより好ましい。一方、ロールの表面温度は、１８０℃以下とすることにより、過剰に圧着しにくくなるため、好ましく、１６０℃以下とするのがより好ましい。 The surface temperature of the roll is preferably 120 ° C. or higher because it facilitates crimping, and more preferably 130 ° C. or higher. On the other hand, the surface temperature of the roll is preferably 180 ° C. or lower because it is difficult to excessively crimp the roll, and more preferably 160 ° C. or lower.
押し圧は、１０ｋＰａ以上とすることにより、面拘束しやすくなるため、好ましく、３０ｋＰａ以上がより好ましく、５０ｋＰａ以上がさらに好ましく、１００ｋＰａ以上が特に好ましく、２００ｋＰａ以上が最も好ましい。一方、押し圧は、４００ｋＰａ以下とすることにより、過剰に圧着しにくくなるため、好ましく、３５０ｋＰａ以下がより好ましく、３００ｋＰａ以下がさらに好ましい。 When the pressing pressure is 10 kPa or more, the surface is easily constrained, so it is preferable, 30 kPa or more is more preferable, 50 kPa or more is further preferable, 100 kPa or more is particularly preferable, and 200 kPa or more is most preferable. On the other hand, when the pressing pressure is 400 kPa or less, it becomes difficult to excessively crimp, so it is preferable, 350 kPa or less is more preferable, and 300 kPa or less is further preferable.
加工時間は、３秒以上とすることにより、圧着しやすくなるため好ましく、５秒以上とすることがより好ましい。一方、加工時間は、３５秒以下とすることにより、過剰に圧着しにくくなるため好ましく、２０秒以下とすることがより好ましく、１５秒以下とすることがさらに好ましい。 The processing time is preferably 3 seconds or more because it facilitates crimping, and more preferably 5 seconds or more. On the other hand, the processing time is preferably 35 seconds or less because it is difficult to excessively crimp, more preferably 20 seconds or less, and further preferably 15 seconds or less.
加工速度を好ましくは１ｍ／分以上とすることにより、過剰に圧着しにくくなる。より好ましくは５ｍ／分以上である。一方、加工速度を好ましくは３０ｍ／分以下とすることにより、圧着しやすくなる。より好ましくは２０ｍ／分以下である。 By setting the processing speed to preferably 1 m / min or more, it becomes difficult to excessively crimp. More preferably, it is 5 m / min or more. On the other hand, when the processing speed is preferably 30 m / min or less, crimping becomes easy. More preferably, it is 20 m / min or less.
本圧着の加工温度（ロールの表面温度）と加工時間の組み合わせは特に限定されるものではないが、好適なＭＤ方向（製品流れ方向、経方向ともいう）の伸長時の応力を有する長繊維不織布とするために、加工温度を低くする場合は加工時間を長く、加工温度を高くする場合は加工時間を小さくすることが好ましい。具体的には、加工温度が１２０℃以上１４０℃未満では加工時間は２０秒以上３５秒以下が好ましく、加工温度が１４０℃以上１６０℃未満では加工時間は１０秒以上２５秒以下が好ましく、加工温度が１６０℃以上１９０℃以下では加工時間は３秒以上１５秒以下が好ましい。 The combination of the processing temperature (roll surface temperature) and the processing time of this crimping is not particularly limited, but a long-fiber non-woven fabric having a stress during elongation in a suitable MD direction (also referred to as a product flow direction or a warp direction). Therefore, it is preferable that the processing time is long when the processing temperature is low, and the processing time is short when the processing temperature is high. Specifically, when the processing temperature is 120 ° C. or more and less than 140 ° C., the processing time is preferably 20 seconds or more and 35 seconds or less, and when the processing temperature is 140 ° C. or more and less than 160 ° C., the processing time is preferably 10 seconds or more and 25 seconds or less. When the temperature is 160 ° C. or higher and 190 ° C. or lower, the processing time is preferably 3 seconds or more and 15 seconds or less.
このようにして得られた本発明の実施形態２の長繊維不織布は、濾材との貼り合わせ性とプリーツ加工性に優れた、フィルター補強材の使用に好適なものとなる。 The long-fiber non-woven fabric of the second embodiment of the present invention thus obtained is suitable for use of a filter reinforcing material having excellent adhesiveness to a filter medium and pleating workability.
以下、実施例を挙げて本発明をより具体的に説明するが、本発明は下記実施例によって制限されず、前・後記の趣旨に適合し得る範囲で変更を加えて実施することも可能であり、それらはいずれも本発明の技術的範囲に包含される。 Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples, and it is possible to carry out the present invention with modifications to the extent that it can be adapted to the gist of the above and the following. Yes, they are all within the technical scope of the invention.
＜固有粘度＞
ポリエチレンテレフタレート樹脂０．１ｇを秤量し、２５ｍｌのフェノール／テトラクロルエタン（６０／４０（質量比））の混合溶媒に溶解し、オストワルド粘度計を用いて３０℃で３回測定し、その平均値を求めた。<Intrinsic viscosity>
0.1 g of polyethylene terephthalate resin was weighed, dissolved in a mixed solvent of 25 ml of phenol / tetrachloroethane (60/40 (mass ratio)), measured three times at 30 ° C. using an Ostwald viscometer, and the average value thereof. Asked.
＜ガラス転移点温度＞
ＪＩＳ Ｋ７１２２（１９８７）に従って、ＴＡ Ｉｎｓｔｒｕｍｅｎｔｓ社製のＱ１００を使用して、２０℃／分の昇温速度で、熱可塑性ポリスチレン系共重合体のガラス転移点温度を求めた。<Glass transition temperature>
According to JIS K7122 (1987), the glass transition temperature of the thermoplastic polystyrene-based copolymer was determined at a heating rate of 20 ° C./min using Q100 manufactured by TA Instruments.
＜目付＞
ＪＩＳ Ｌ１９１３（２０１０）６．２に従って、単位面積当たりの質量である目付を測定した。<Metsuke>
The basis weight, which is the mass per unit area, was measured according to JIS L1913 (2010) 6.2.
＜平均繊維径＞
長繊維不織布試料の任意の場所５点を選び、光学顕微鏡を用いて単繊維の径をｎ＝２０で測定し、平均値を求めた。<Average fiber diameter>
Five points were selected at arbitrary locations on the long-fiber non-woven fabric sample, and the diameter of the single fiber was measured at n = 20 using an optical microscope, and the average value was calculated.
＜複屈折率（Δｎ）＞
長繊維不織布試料の任意の場所５点を選び、単繊維をとりだし、ニコン社製の偏向顕微鏡ＯＰＴＩＰＨＯＴ−ＰＯＬ型を用いて、繊維径とレターデーションを読み取り、複屈折率（Δｎ）を求めた。<Birefringence (Δn)>
Five points of a long-fiber non-woven fabric sample were selected, single fibers were taken out, and the fiber diameter and retardation were read using a deflection microscope OPTIPHOT-POL type manufactured by Nikon Corporation to determine the birefringence index (Δn).
＜結晶化度＞
長繊維不織布試料の任意の場所１０点を選び、密度勾配管により比重を測定し、以下の式で結晶化度を求めた。
結晶化度＝（試料比重−非晶領域比重）／（結晶領域比重−非晶領域比重）×１００
なお、ポリエチレンテレフタレート長繊維不織布の場合、非晶領域比重は１．３３５、結晶領域比重は１．５１５である。<Crystallinity>
Ten points were selected at arbitrary locations on the long-fiber non-woven fabric sample, the specific gravity was measured with a density gradient tube, and the crystallinity was determined by the following formula.
Crystallinity = (Sample specific density-Amorphous region specific gravity) / (Crystal region specific gravity-Amorphous region specific gravity) x 100
In the case of polyethylene terephthalate long fiber non-woven fabric, the amorphous region specific gravity is 1.335 and the crystalline region specific gravity is 1.515.
＜ＭＤ方向の８０℃における１０％伸長時応力＞
長繊維不織布の任意の場所から、長繊維不織布のＭＤ方向の長さ２０ｃｍ、ＣＤ方向（ＭＤ方向に垂直な方向、幅方向ともいう）の長さが５ｃｍになるよう切り出した５点の試料を８０±２℃に制御した恒温槽内で、２００ｍｍ／ｍｉｎの速度で長手方向に引っ張る引張試験を行ない、読み取った１０％伸長時の応力をＭＤ方向の８０℃における１０％伸張時応力とした。<Stress during 10% elongation at 80 ° C in the MD direction>
Five samples cut out from any place of the long fiber non-woven fabric so that the length of the long-fiber non-woven fabric in the MD direction is 20 cm and the length in the CD direction (also referred to as the direction perpendicular to the MD direction and the width direction) is 5 cm. A tensile test of pulling in the longitudinal direction was performed at a speed of 200 mm / min in a constant temperature bath controlled at 80 ± 2 ° C., and the read stress at 10% elongation was defined as the 10% elongation stress at 80 ° C. in the MD direction.
＜剛軟度＞
ＪＩＳ Ｌ１０９６（２０１０） ８．２２．１ Ａ法（ガーレ法）に従って、試料長は幅２５ｍｍ、長さ８９ｍｍとし、長繊維不織布のＭＤ方向、ＣＤ方向それぞれを任意の場所５点を選び、荷重５ｇで測定し、ＭＤ方向およびＣＤ方向の全ての値の平均値を測定値とした。<Rigidity>
According to JIS L1096 (2010) 8.22.1 A method (Gale method), the sample length is 25 mm in width and 89 mm in length, and 5 points are selected at arbitrary locations in the MD direction and CD direction of the long fiber non-woven fabric, and the load is 5 g. The average value of all the values in the MD direction and the CD direction was taken as the measured value.
＜折れ角度＞
幅５０ｍｍ、長さ６０ｍｍの試験片を長さ方向に２つ折りにし、８０℃で５．２ｋＰａの圧力下で１０秒プレスし、除荷６０秒後に試験片の開いた角度を折れ角度として求めた。<Bending angle>
A test piece having a width of 50 mm and a length of 60 mm was folded in half in the length direction, pressed at 80 ° C. under a pressure of 5.2 kPa for 10 seconds, and 60 seconds after unloading, the open angle of the test piece was determined as the folding angle. ..
＜ひだ密着性評価＞
１５０ｃｍ角サイズに、山高さ３０ｍｍで２５山の分のユニットを作製して、面風速１ｍ／分以上４ｍ／分以下で風を通過させ、どの風速範囲でひだが密着するか目視確認した。測定試料は、長繊維不織布と１μｍ相当のＰＰメルトブロー（目付２０ｇ／ｍ２）を低融点の接着不織布（呉羽テック製ダイナック）で複合させたものを用いた。評価基準は以下のとおりである。
優：面風速３ｍ／分以上でひだが密着
良：面風速２ｍ／分以上３ｍ／分未満でひだが密着
不良：面風速１ｍ／分以上２ｍ／分未満でひだが密着<Evaluation of fold adhesion>
A unit for 25 mountains with a mountain height of 30 mm was prepared in a size of 150 cm square, and the wind was passed through at a surface wind speed of 1 m / min or more and 4 m / min or less, and it was visually confirmed in which wind speed range the folds adhered. As the measurement sample, a long fiber non-woven fabric and a PP melt blow (with a grain of 20 g / m 2 ) equivalent to 1 μm were combined with a low melting point adhesive non-woven fabric (Dynac manufactured by Kureha Tech). The evaluation criteria are as follows.
Excellent: Adhesion of folds at a surface wind speed of 3 m / min or more Good: Adhesion of folds at a surface wind speed of 2 m / min or more and less than 3 m / min Poor: Adhesion of folds at a surface wind speed of 1 m / min or more and less than 2 m / min
＜表面粗さ（ＳＭＤ）＞
長繊維不織布試料の任意の場所５点を選び、カトーテック社製のＫＥＳ−ＦＢ４−Ａ（表面試験機）を用いて標準感度、摩擦子に０．５ｍｍφのピアノ線、摩擦子への垂直荷重は１０ｇｆ、移動速度１ｍｍ／ｓｅｃ、実移動距離２０ｍｍで試験し、不織布のＭＤ方向に両表面それぞれの表面粗さの平均偏差（ＳＭＤ）を求め、表面粗さとした。<Surface Roughness (SMD)>
Select 5 points of the long-fiber non-woven fabric sample at any place, use KES-FB4-A (surface tester) manufactured by Katou Tech Co., Ltd., standard sensitivity, 0.5 mmφ piano wire for the friction element, and vertical load on the friction element. Was tested at 10 gf, a moving speed of 1 mm / sec, and an actual moving distance of 20 mm, and the average deviation (SMD) of the surface roughness of both surfaces in the MD direction of the non-woven fabric was determined and used as the surface roughness.
＜濾材との貼り合わせ性＞
Ａ４サイズの試験片を長手方向に２つ折りにし、５．２ｋＰａの圧力下で１０秒プレスした後に、折れた先端部の濾材と補強材との界面を目視でチェックし、以下の基準の通り評価する。測定試料は、長繊維不織布と１μｍ相当のＰＰメルトブロー（目付２０ｇ／ｍ２）を低融点の接着不織布（呉羽テック社製ダイナック）で複合させたものを用いた。評価基準は以下のとおりである。
優：浮き・剥がれがない
良：微細な浮き・剥がれがある
不良：明確な浮き・剥がれがある<Adhesion with filter media>
A4 size test piece is folded in half in the longitudinal direction, pressed for 10 seconds under a pressure of 5.2 kPa, and then the interface between the filter medium and the reinforcing material at the broken tip is visually checked and evaluated according to the following criteria. do. As the measurement sample, a long fiber non-woven fabric and a PP melt blow (with a grain of 20 g / m 2 ) equivalent to 1 μm were combined with a low melting point adhesive non-woven fabric (Dynac manufactured by Kureha Tech Co., Ltd.). The evaluation criteria are as follows.
Excellent: No floating / peeling Good: Fine floating / peeling Defective: Clear floating / peeling
＜プリーツ加工性＞
レシプロ機を用いて山高さ３２ｍｍ、山間隔３ｍｍでプリーツ加工し、１３４山のユニットを作成し、山高さ・間隔の均一性を目視でチェックし、以下の評価基準により評価する。測定試料は、長繊維不織布と１μｍ相当のＰＰメルトブロー（目付２０ｇ／ｍ２）を低融点の接着不織布（呉羽テック社製ダイナック）で複合させたものを用いた。評価基準は以下のとおりである。
良：山高さ・間隔が均一
不良：山高さ、間隔が不均一<Pleated workability>
Pleat with a mountain height of 32 mm and a mountain spacing of 3 mm using a reciprocating machine to create 134 mountain units, visually check the uniformity of the mountain height and spacing, and evaluate according to the following evaluation criteria. As the measurement sample, a long fiber non-woven fabric and a PP melt blow (with a grain of 20 g / m 2 ) equivalent to 1 μm were combined with a low melting point adhesive non-woven fabric (Dynac manufactured by Kureha Tech Co., Ltd.). The evaluation criteria are as follows.
Good: Uniform mountain height and spacing Poor: Non-uniform mountain height and spacing
以下の実施例１−１〜１−６および比較例１−１〜１−３は、それぞれ上記の実施形態１の長繊維不織布に対応する実施例および比較例である。 The following Examples 1-1 to 1-6 and Comparative Examples 1-1 to 1-3 are Examples and Comparative Examples corresponding to the long-fiber non-woven fabric of the first embodiment, respectively.
（実施例１−１）
長繊維不職布紡糸設備を用い、固有粘度０．６３のポリエチレンテレフタレートに、ガラス転移点温度が１２２℃のスチレン・メタクリル酸メチル・無水マレイン酸共重合体（Ｒｏｈｍ ＧｍｂＨ＆Ｃｏ．ＫＧのＰＬＥＸＩＧＬＡＳ ＨＷ５５（以下、「ＨＷ５５」という）を０．４０質量％混合した樹脂を、オリフィス径０．４５ｍｍの紡糸口金より単孔吐出量３．５ｇ／分で紡出した。さらに、エジェクタに１００ｋＰａの圧力（ジェット圧）で乾燥エアを供給し、１段階で延伸して、下方のコンベア上へ繊維を開繊させつつ捕集し長繊維フリースを得た。繊維径より換算した紡糸速度は２０２０ｍ／分であった。(Example 1-1)
PLEXIGLAS HW55 (hereinafter referred to as Rohm GmbH & Co. KG) of styrene / methyl methacrylate / maleic anhydride copolymer (Rohm GmbH & Co. KG) having a glass transition temperature of 122 ° C. on polyethylene terephthalate having an intrinsic viscosity of 0.63 using a long-fiber unemployed cloth spinning facility. , "HW55") mixed in 0.40% by mass was spun from a spinneret having an orifice diameter of 0.45 mm at a single-hole discharge rate of 3.5 g / min. Further, a pressure of 100 kPa (jet pressure) was applied to the ejector. ), Dry air was supplied and the fibers were stretched in one step, and the fibers were collected while being opened on the lower conveyor to obtain a long fiber fleece. The spinning speed converted from the fiber diameter was 2020 m / min. ..
得られた長繊維フリースを、２つのフラットロールからなる１対の仮熱圧着ロールを用いて、それぞれの表面温度を８０℃とし、押し圧を８ｋＮ／ｍとして仮圧着した後、ロールの表面温度（加工温度）１８０℃で、押し圧３００ｋＰａ、加工時間４秒、加工速度２０ｍ／分の条件でフェルトカレンダーにより面拘束しながら本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece is temporarily crimped using a pair of temporary thermocompression bonding rolls composed of two flat rolls at a surface temperature of 80 ° C. and a pressing pressure of 8 kN / m, and then the surface temperature of the rolls. This crimping was performed at 180 ° C. under the conditions of a pressing pressure of 300 kPa, a processing time of 4 seconds, and a processing speed of 20 m / min while restraining the surface with a felt calendar to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は８８ｇ／ｍ２、平均繊維径は３９μｍ、複屈折率は０．０１００、結晶化度は１３．０％、ＭＤ方向の８０℃における１０％伸長時応力は２４．７Ｎ／５ｃｍ、剛軟度は１５５ｍｇ、折れ角度は１°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a texture of 88 g / m 2 , an average fiber diameter of 39 μm, a birefringence of 0.0100, a crystallinity of 13.0%, and a stress at 10% elongation at 80 ° C. in the MD direction of 24. The rigidity was 155 mg and the bending angle was 1 °. The spinning conditions and measurement results are summarized in Table 1.
（実施例１−２）
エジェクタに８０ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例１−１と同様の条件で長繊維フリースを得た。繊維径より換算紡糸速度は１８３０ｍ／分であった。(Example 1-2)
A long fiber fleece was obtained under the same conditions as in Example 1-1 except that dry air was supplied to the ejector at a pressure (jet pressure) of 80 kPa. From the fiber diameter, the converted spinning speed was 1830 m / min.
得られた長繊維フリースを実施例１と同様に仮圧着した後、ロールの表面温度（加工温度）１４５℃で、押し圧３００ｋＰａ、加工時間２４秒、加工速度３．０ｍ／分の条件でフェルトカレンダーにより面拘束しながら本圧着を行ない、長繊維不織布を得た。 After temporarily crimping the obtained long fiber fleece in the same manner as in Example 1, felt under the conditions of a roll surface temperature (machining temperature) of 145 ° C., a pressing pressure of 300 kPa, a machining time of 24 seconds, and a machining speed of 3.0 m / min. This crimping was performed while restraining the surface with a calendar to obtain a long-fiber non-woven fabric.
得られた長繊維不織布の目付は９１ｇ／ｍ２、平均繊維径は４２μｍ、複屈折率は０．００５５、結晶化度は１９．９％、ＭＤ方向の８０℃における１０％伸長時応力は３２．７Ｎ／５ｃｍ、剛軟度は１３５ｍｇ、折れ角度は７°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a texture of 91 g / m 2 , an average fiber diameter of 42 μm, a birefringence of 0.0055, a crystallinity of 19.9%, and a stress at 10% elongation at 80 ° C. in the MD direction of 32. The stiffness was .7 N / 5 cm, the flexibility was 135 mg, and the bending angle was 7 °. The spinning conditions and measurement results are summarized in Table 1.
（実施例１−３）
紡糸口金より単孔吐出量５．０ｇ／分で紡出し、エジェクタに１９５ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例１−１と同様の条件で長繊維フリースを得た。繊維径からの換算紡糸速度は２６４０ｍ／分であった。(Example 1-3)
A long fiber fleece was obtained under the same conditions as in Example 1-1 except that a single-hole discharge rate of 5.0 g / min was spun from the spinneret and dry air was supplied to the ejector at a pressure (jet pressure) of 195 kPa. The converted spinning speed from the fiber diameter was 2640 m / min.
得られた長繊維フリースを実施例１−２と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 1-2 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は８９ｇ／ｍ２、平均繊維径は３５μｍ、複屈折率は０．０１５７、結晶化度は２３．４％、ＭＤ方向の８０℃における１０％伸長時応力は５１．３Ｎ／５ｃｍ、剛軟度は１６５ｍｇ、折れ角度は１１°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a texture of 89 g / m 2 , an average fiber diameter of 35 μm, a birefringence of 0.0157, a crystallinity of 23.4%, and a stress at 10% elongation at 80 ° C. in the MD direction of 51. The stiffness was 165 mg and the bending angle was 11 °. The spinning conditions and measurement results are summarized in Table 1.
（実施例１−４）
紡糸口金より単孔吐出量４．２ｇ／分で紡出し、エジェクタに１５５ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例１−１と同様の条件で長繊維フリースを得た。繊維径からの換算紡糸速度は２３６５ｍ／分であった。(Example 1-4)
A long fiber fleece was obtained under the same conditions as in Example 1-1 except that a single-hole discharge rate of 4.2 g / min was spun from the spinneret and dry air was supplied to the ejector at a pressure (jet pressure) of 155 kPa. The converted spinning speed from the fiber diameter was 2365 m / min.
得られた長繊維フリースを実施例１−２と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 1-2 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付量は７０ｇ／ｍ２、平均繊維径は３９μｍ、複屈折率は０．００９１、結晶化度は２０．６％、ＭＤ方向の８０℃における１０％伸長時応力は４１．０Ｎ／５ｃｍ、剛軟度は１２８ｍｇ、折れ角度は９°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a grain size of 70 g / m 2 , an average fiber diameter of 39 μm, a birefringence of 0.0091, a crystallinity of 20.6%, and a stress at 10% elongation at 80 ° C. in the MD direction. It was 41.0 N / 5 cm, had a rigidity of 128 mg, and had a bending angle of 9 °. The spinning conditions and measurement results are summarized in Table 1.
（実施例１−５）
エジェクタに２００ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例１−１と同様の条件で長繊維フリースを得た。繊維径からの換算紡糸速度は２８１０ｍ／分であった。(Example 1-5)
A long fiber fleece was obtained under the same conditions as in Example 1-1 except that dry air was supplied to the ejector at a pressure (jet pressure) of 200 kPa. The converted spinning speed from the fiber diameter was 2810 m / min.
得られた長繊維フリースを実施例１−２と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 1-2 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は７３ｇ／ｍ２、平均繊維径は３４μｍ、複屈折率は０．０１９０、結晶化度は２２．８％、ＭＤ方向の８０℃における１０％伸長時応力は５５．９Ｎ／５ｃｍ、剛軟度は１０５ｍｇ、折れ角度は１０°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a texture of 73 g / m 2 , an average fiber diameter of 34 μm, a birefringence of 0.0190, a crystallinity of 22.8%, and a stress at 10% elongation at 80 ° C. in the MD direction of 55. The stiffness was .9 N / 5 cm, the rigidity was 105 mg, and the bending angle was 10 °. The spinning conditions and measurement results are summarized in Table 1.
（実施例１−６）
紡糸口金より単孔吐出量３．５ｇ／分で紡出し、エジェクタに７５ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例１−１と同様の条件で長繊維フリースを得た。繊維径からの換算紡糸速度は１７５１ｍ／分であった。(Example 1-6)
A long fiber fleece was obtained under the same conditions as in Example 1-1 except that a single-hole discharge rate of 3.5 g / min was spun from the spinneret and dry air was supplied to the ejector at a pressure (jet pressure) of 75 kPa. The converted spinning speed from the fiber diameter was 1751 m / min.
得られた長繊維フリースを実施例１−２と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 1-2 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は７２ｇ／ｍ２、平均繊維径は４３μｍ、複屈折率は０．００５０、ＭＤ方向の８０℃、１０％伸長時応力は３５．７Ｎ／５ｃｍ、剛軟度は１１０ｍｇ、結晶化度は１８．３％、折れ角度は６°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a grain size of 72 g / m 2 , an average fiber diameter of 43 μm, a birefringence of 0.0050, an MD direction of 80 ° C., a stress at 10% elongation of 35.7 N / 5 cm, and a rigidity and softness of 35.7 N / 5 cm. The crystallinity was 18.3% at 110 mg, and the bending angle was 6 °. The spinning conditions and measurement results are summarized in Table 1.
（比較例１−１）
実施例１−１と同様にして長繊維フリースを得た。繊維径からの換算紡糸速度は２１２０ｍ／分であった。(Comparative Example 1-1)
A long fiber fleece was obtained in the same manner as in Example 1-1. The converted spinning speed from the fiber diameter was 2120 m / min.
得られた長繊維フリースを実施例１−１と同様に仮圧着した後、ロールの表面温度（加工温度）１６５℃で、押し圧３００ｋＰａ、加工時間２４秒、加工速度３．０ｍ／分の条件でフェルトカレンダーにより面拘束しながら本圧着を行ない、長繊維不織布を得た。 After temporarily crimping the obtained long fiber fleece in the same manner as in Example 1-1, the conditions are that the surface temperature (machining temperature) of the roll is 165 ° C., the pressing pressure is 300 kPa, the machining time is 24 seconds, and the machining speed is 3.0 m / min. This crimping was performed while restraining the surface with a felt calendar to obtain a long-fiber non-woven fabric.
得られた長繊維不織布の目付は９０ｇ／ｍ２、平均繊維径は３９μｍ、複屈折率は０．００９８、結晶化度は２６．０％、ＭＤ方向の８０℃における１０％伸長時応力は６２．６Ｎ／５ｃｍ、剛軟度は１３３ｍｇ、折れ角度は１７°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a texture of 90 g / m 2 , an average fiber diameter of 39 μm, a birefringence of 0.0098, a crystallinity of 26.0%, and a stress at 10% elongation at 80 ° C. in the MD direction of 62. It was .6 N / 5 cm, had a rigidity of 133 mg, and had a bending angle of 17 °. The spinning conditions and measurement results are summarized in Table 1.
（比較例１−２）
紡糸口金より単孔吐出量４．２ｇ／分で紡出し、エジェクタに１８５ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例１−１と同様の条件で長繊維フリースを得た。繊維径からの換算紡糸速度は３１３９ｍ／分であった。(Comparative Example 1-2)
A long fiber fleece was obtained under the same conditions as in Example 1-1 except that a single-hole discharge rate of 4.2 g / min was spun from the spinneret and dry air was supplied to the ejector at a pressure (jet pressure) of 185 kPa. The converted spinning speed from the fiber diameter was 3139 m / min.
得られた長繊維フリースを実施例２と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 2 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は９１ｇ／ｍ２、平均繊維径は３５μｍ、複屈折率は０．０２２０、結晶化度は２８．７％、ＭＤ方向の８０℃における１０％伸長時応力は７３．５Ｎ／５ｃｍ、剛軟度は２５５ｍｇ、折れ角度は２０°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a texture of 91 g / m 2 , an average fiber diameter of 35 μm, a birefringence of 0.0220, a crystallinity of 28.7%, and a stress at 10% elongation at 80 ° C. in the MD direction of 73. It was .5 N / 5 cm, had a rigidity of 255 mg, and had a bending angle of 20 °. The spinning conditions and measurement results are summarized in Table 1.
（比較例１−３）
紡糸口金より単孔吐出量１．６ｇ／分で紡出し、エジェクタに７５ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例１と同様の条件で長繊維フリースを得た。繊維径からの換算紡糸速度は１８５６ｍ／分であった。(Comparative Example 1-3)
A long fiber fleece was obtained under the same conditions as in Example 1 except that a single-hole discharge rate of 1.6 g / min was spun from the spinneret and dry air was supplied to the ejector at a pressure (jet pressure) of 75 kPa. The converted spinning speed from the fiber diameter was 1856 m / min.
得られた長繊維フリースを実施例１−１と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 1-1 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は７０ｇ／ｍ２、平均繊維径は２８μｍ、複屈折率は０．０１９９、結晶化度は２５．５％、ＭＤ方向の８０℃における１０％伸長時応力は６１．９Ｎ／５ｃｍ、剛軟度は６４ｍｇ、折れ角度は１６°であった。紡糸条件および測定結果を表１にまとめた。The obtained long fiber non-woven fabric has a texture of 70 g / m 2 , an average fiber diameter of 28 μm, a birefringence of 0.0199, a crystallinity of 25.5%, and a stress at 10% elongation at 80 ° C. in the MD direction of 61. It was 9.9 N / 5 cm, had a rigidity of 64 mg, and a bending angle of 16 °. The spinning conditions and measurement results are summarized in Table 1.
表１に示すように本発明の上記［１］、好ましくは［３］〜［５］の構成を備える実施形態１に対応する実施例１−１〜１−６の長繊維不織布は、プリーツ加工性、プリーツ形態保持性に優れていた。 As shown in Table 1, the long-fiber non-woven fabrics of Examples 1-1 to 1-6 corresponding to the first embodiment having the above-mentioned [1], preferably [3] to [5] configurations of the present invention are pleated. It was excellent in sex and pleated morphology retention.
比較例１−１で得られた長繊維不織布は、ＭＤ方向の８０℃における１０％伸長時応力が６０ｃＮ／５ｃｍを超えるため、プリーツ加工性が悪いものであった。 The long-fiber non-woven fabric obtained in Comparative Example 1-1 had poor pleating workability because the stress at 10% elongation at 80 ° C. in the MD direction exceeded 60 cN / 5 cm.
比較例１−２で得られた長繊維不織布は、プリーツ形態保持性には優れていたものの、ＭＤ方向の８０℃における１０％伸長時応力が６０ｃＮ／５ｃｍを超えるため、プリーツ加工性が悪いものであった。 The long-fiber non-woven fabric obtained in Comparative Example 1-2 was excellent in pleated morphological retention, but had poor pleated workability because the stress at 10% elongation at 80 ° C. in the MD direction exceeded 60 cN / 5 cm. Met.
比較例１−３で得られた長繊維不織布は、ＭＤ方向の８０℃における１０％伸長時応力が６０ｃＮ／５ｃｍを超えるため、プリーツ加工性が悪く、さらに、剛軟度が低いため、容易にひだ密着が発生するプリーツ形態保持性が悪いものであった。 The long-fiber non-woven fabric obtained in Comparative Example 1-3 has poor pleating workability because the stress at 10% elongation at 80 ° C. in the MD direction exceeds 60 cN / 5 cm, and further has low rigidity and softness, so that it can be easily obtained. The pleated morphology retention was poor, which caused fold adhesion.
以下の実施例２−１〜２−４および比較例２−１〜２−３は、それぞれ上記の実施形態２の長繊維不織布に対応する実施例および比較例である。 The following Examples 2-1 to 2-4 and Comparative Examples 2-1 to 2-3 are Examples and Comparative Examples corresponding to the long-fiber non-woven fabric of the second embodiment, respectively.
（実施例２−１）
長繊維不職布紡糸設備を用い、固有粘度０．６３のポリエチレンテレフタレートに、ガラス転移点温度が１２２℃のスチレン・メタクリル酸メチル・無水マレイン酸共重合体（Ｒｏｈｍ ＧｍｂＨ＆Ｃｏ．ＫＧのＰＬＥＸＩＧＬＡＳ ＨＷ５５（以下、「ＨＷ５５」という）を０．４０質量％混合した樹脂を、オリフィス径０．４５ｍｍの紡糸口金より単孔吐出量３．５ｇ／分で紡出した。さらに、エジェクタに１００ｋＰａの圧力（ジェット圧）で乾燥エアを供給し、１段階で延伸して、下方のコンベア上へ繊維を開繊させつつ捕集し長繊維フリースを得た。(Example 2-1)
Using a long-fiber unemployed cloth spinning facility, a polyethylene terephthalate with an intrinsic viscosity of 0.63 and a styrene / methyl methacrylate / maleic anhydride copolymer (Rohm GmbH & Co. KG PLEXIGLAS HW55) having a glass transition temperature of 122 ° C. , "HW55") mixed in 0.40% by mass was spun from a spun cap with an orifice diameter of 0.45 mm at a single-hole discharge rate of 3.5 g / min. Further, a pressure of 100 kPa (jet pressure) was applied to the ejector. ), Dry air was supplied, the fibers were stretched in one step, and the fibers were collected while being opened on the lower conveyor to obtain a long fiber fleece.
得られた長繊維フリースを、２つのフラットロールからなる１対の仮熱圧着ロールを用いて、それぞれの表面温度を８０℃とし、押し圧を８ｋＮ／ｍとして仮圧着した後、ロールの表面温度（加工温度）１８０℃で、押し圧３００ｋＰａ、加工時間４秒、加工速度２０ｍ／分の条件で樹脂ネットカレンダーにより面拘束しながら本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece is temporarily crimped using a pair of temporary thermocompression bonding rolls composed of two flat rolls at a surface temperature of 80 ° C. and a pressing pressure of 8 kN / m, and then the surface temperature of the rolls. This crimping was performed at 180 ° C. under the conditions of a pressing pressure of 300 kPa, a processing time of 4 seconds, and a processing speed of 20 m / min while restraining the surface with a resin net calendar to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は９０ｇ／ｍ２、平均繊維径は４２μｍ、複屈折率は０．０１０、一方の表面の表面粗さは１．９、もう一方の表面の表面粗さは５．５、濾材との貼り合わせ性は「良」で、プリーツ加工性は「良」であった。紡糸条件および測定結果を表２にまとめた。The obtained long fiber non-woven fabric has a texture of 90 g / m 2 , an average fiber diameter of 42 μm, a birefringence of 0.010, a surface roughness of one surface of 1.9, and a surface roughness of the other surface of 5. 5.5, the adhesiveness with the filter medium was "good", and the pleating workability was "good". The spinning conditions and measurement results are summarized in Table 2.
（実施例２−２）
エジェクタに８０ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例２−１と同様の条件で長繊維フリースを得た。(Example 2-2)
A long fiber fleece was obtained under the same conditions as in Example 2-1 except that dry air was supplied to the ejector at a pressure (jet pressure) of 80 kPa.
得られた長繊維フリースを実施例２−１と同様に仮圧着した後、ロールの表面温度（加工温度）１４５℃で、押し圧３００ｋＰａ、加工時間２４秒、加工速度３．０ｍ／分の条件でフェルトカレンダーにより面拘束しながら本圧着を行ない、長繊維不織布を得た。 After the obtained long fiber fleece is temporarily crimped in the same manner as in Example 2-1 under the conditions of a roll surface temperature (machining temperature) of 145 ° C., a pressing pressure of 300 kPa, a machining time of 24 seconds, and a machining speed of 3.0 m / min. This crimping was performed while restraining the surface with a felt calendar to obtain a long-fiber non-woven fabric.
得られた長繊維不織布の目付は９０ｇ／ｍ２、平均繊維径は４２μｍ、複屈折率は０．０１０、一方の表面の表面粗さは１．９、もう一方の表面の表面粗さは４．９、濾材との貼り合わせ性は「良」、プリーツ加工性は「良」であった。紡糸条件および測定結果を表２にまとめた。The obtained long fiber non-woven fabric has a texture of 90 g / m 2 , an average fiber diameter of 42 μm, a birefringence of 0.010, a surface roughness of one surface of 1.9, and a surface roughness of the other surface of 4. 9.9, the adhesiveness with the filter medium was "good", and the pleating workability was "good". The spinning conditions and measurement results are summarized in Table 2.
（実施例２−３）
エジェクタに１８０ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例２−１と同様の条件で長繊維フリースを得た。(Example 2-3)
A long fiber fleece was obtained under the same conditions as in Example 2-1 except that dry air was supplied to the ejector at a pressure (jet pressure) of 180 kPa.
得られた長繊維フリースを実施例２−１と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 2-1 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は８９ｇ／ｍ２、平均繊維径は３４μｍ、複屈折率は０．０２０、一方の表面の表面粗さは１．５、もう一方の表面の表面粗さは５．２、濾材との貼り合わせ性は「優」、プリーツ加工性は「良」であった。紡糸条件および測定結果を表２にまとめた。The obtained long fiber non-woven fabric has a texture of 89 g / m 2 , an average fiber diameter of 34 μm, a birefringence of 0.020, a surface roughness of one surface of 1.5, and a surface roughness of the other surface of 5. .2, the adhesiveness with the filter medium was "excellent", and the pleating workability was "good". The spinning conditions and measurement results are summarized in Table 2.
（実施例２−４）
紡糸口金より単孔吐出量５．０ｇ／分で紡出し、エジェクタに１９５ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例２−１と同様の条件で長繊維フリースを得た。(Example 2-4)
A long fiber fleece was obtained under the same conditions as in Example 2-1 except that a single-hole discharge rate of 5.0 g / min was spun from the spinneret and dry air was supplied to the ejector at a pressure (jet pressure) of 195 kPa.
得られた長繊維フリースを実施例２−１と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 2-1 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付量は９１ｇ／ｍ２、平均繊維径は３２μｍ、複屈折率は０．０１５７、一方の表面の表面粗さは１．７、もう一方の表面の表面粗さは５．０、濾材との貼り合わせ性は「良」、プリーツ加工性は「良」であった。紡糸条件および測定結果を表２にまとめた。The obtained long fiber non-woven fabric has a grain size of 91 g / m 2 , an average fiber diameter of 32 μm, a birefringence of 0.0157, a surface roughness of one surface of 1.7, and a surface roughness of the other surface. 5.0, the adhesiveness with the filter medium was "good", and the pleating workability was "good". The spinning conditions and measurement results are summarized in Table 2.
（比較例２−１）
エジェクタに２８０ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例２−１と同様の条件で長繊維フリースを得た。(Comparative Example 2-1)
A long fiber fleece was obtained under the same conditions as in Example 2-1 except that dry air was supplied to the ejector at a pressure (jet pressure) of 280 kPa.
得られた長繊維フリースを実施例２−１と同様に仮圧着、本圧着を試みたが、ウェブ強度が不足により搬送不良となり、サンプルは得られなかった。紡糸条件および測定結果を表２にまとめた。 Temporary crimping and main crimping were attempted on the obtained long fiber fleece in the same manner as in Example 2-1. However, due to insufficient web strength, transport was poor and no sample was obtained. The spinning conditions and measurement results are summarized in Table 2.
（比較例２−２）
エジェクタに５０ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例１と同様の条件で長繊維フリースを得た。(Comparative Example 2-2)
A long fiber fleece was obtained under the same conditions as in Example 1 except that dry air was supplied to the ejector at a pressure (jet pressure) of 50 kPa.
得られた長繊維フリースを実施例２−１と同様に仮圧着、本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped and main crimped in the same manner as in Example 2-1 to obtain a long fiber non-woven fabric.
得られた長繊維不織布の目付は９０ｇ／ｍ２、平均繊維径は５２μｍ、複屈折率は０．００７、一方の表面の表面粗さは２．８、もう一方の表面の表面粗さは５．０、濾材の貼り合わせ性は「不良」、プリーツ加工性は「良」であった。紡糸条件および測定結果を表２にまとめた。The obtained long fiber non-woven fabric has a texture of 90 g / m 2 , an average fiber diameter of 52 μm, a birefringence of 0.007, a surface roughness of one surface of 2.8, and a surface roughness of the other surface of 5. .0, the adhesiveness of the filter medium was "poor", and the pleating workability was "good". The spinning conditions and measurement results are summarized in Table 2.
（比較例２−３）
紡糸口金より単孔吐出量１．０ｇ／分で紡出し、エジェクタに３００ｋＰａの圧力（ジェット圧）で乾燥エアを供給した以外は実施例２−１と同様の条件で長繊維フリースを得た。(Comparative Example 2-3)
A long fiber fleece was obtained under the same conditions as in Example 2-1 except that a single-hole discharge rate of 1.0 g / min was spun from the spinneret and dry air was supplied to the ejector at a pressure (jet pressure) of 300 kPa.
得られた長繊維フリースを、２つのフラットロールからなる１対の仮熱圧着ロールを用いて、それぞれの表面温度を８０℃とし、押し圧を８ｋＮ／ｍとして仮圧着した後、圧着面積１４％の刻印を施したエンボスロールと対となるフラットロールをエンボスロールを用いて、フラットロールの表面温度（加工温度）はそれぞれ２４０℃、線圧は５０ｋＮ、加工速度４ｍ/ｍｉｎで本圧着を行ない、長繊維不織布を得た。 The obtained long fiber fleece was temporarily crimped using a pair of temporary thermocompression bonding rolls composed of two flat rolls at a surface temperature of 80 ° C. and a pressing pressure of 8 kN / m, and then a crimping area of 14%. Using the embossed roll, the flat roll paired with the embossed roll with the engraved mark is subjected to main crimping at a surface temperature (machining temperature) of 240 ° C., a linear pressure of 50 kN, and a machining speed of 4 m / min. A long fiber non-woven fabric was obtained.
得られた長繊維不織布の目付は９０ｇ／ｍ２、平均繊維径は１４μｍ、複屈折率は０．０９０、一方の表面の表面粗さは１．９、もう一方の表面の表面粗さは２．５、濾材との貼り合わせ性は「良」、プリーツ加工性は「不良」であった。紡糸条件および測定結果を表２にまとめた。The obtained long fiber non-woven fabric has a texture of 90 g / m 2 , an average fiber diameter of 14 μm, a birefringence of 0.090, a surface roughness of one surface of 1.9, and a surface roughness of the other surface of 2. 5.5, the adhesiveness with the filter medium was "good", and the pleating workability was "poor". The spinning conditions and measurement results are summarized in Table 2.
表２に示すように本発明で規定する要件を満たす実施例１〜４の長繊維不織布は、濾材
との貼り合わせ性とプリーツ加工性に優れていた。As shown in Table 2, the long-fiber non-woven fabrics of Examples 1 to 4 satisfying the requirements specified in the present invention were excellent in adhesiveness to the filter medium and pleating workability.
比較例２−２で得られた長繊維不織布は、プリーツ加工性には優れていたものの、表面粗さが２．０以下の表面がなく、濾材との貼り合わせ性が悪いものであった。 The long-fiber non-woven fabric obtained in Comparative Example 2-2 was excellent in pleating workability, but had no surface with a surface roughness of 2.0 or less, and had poor adhesiveness with a filter medium.
比較例２−３で得られた長繊維不織布は、濾材との貼り合わせ性は優れていたが、表面粗さが３．５以上の表面がなく、プリーツ加工性が悪いものであった。 The long-fiber non-woven fabric obtained in Comparative Example 2-3 had excellent adhesiveness to the filter medium, but had no surface with a surface roughness of 3.5 or more, and had poor pleating workability.
本発明の実施形態１の長繊維不織布は、プリーツ加工性に優れ、実使用下でひだ密着し難い剛性を有しプリーツ形態保持性の優れた、フィルター補強材に適した長繊維不職布である。また、本発明の実施形態２の長繊維不織布は、濾材との貼り合わせ性とプリーツ加工性に優れた、フィルター補強材に適した長繊維不職布である。さらに、これらは、単一成分の繊維から構成される長繊維不織布であるため、製造コストが安価な長繊維不職布を提供できるため産業界に寄与すること大である。 The long-fiber non-woven fabric of the first embodiment of the present invention is a long-fiber non-woven fabric suitable for a filter reinforcing material, which has excellent pleating workability, rigidity that does not easily adhere to folds under actual use, and excellent pleated shape retention. be. Further, the long-fiber non-woven fabric of the second embodiment of the present invention is a long-fiber non-woven fabric suitable for a filter reinforcing material, which has excellent adhesiveness to a filter medium and pleating workability. Further, since these are long-fiber non-woven fabrics composed of fibers of a single component, they can provide long-fiber non-woven fabrics at low manufacturing cost, which greatly contributes to the industrial world.
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