JP2004181341A - Wet nonwoven fabric for filter and polyester binder fiber for use therein - Google Patents
Wet nonwoven fabric for filter and polyester binder fiber for use therein Download PDFInfo
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- JP2004181341A JP2004181341A JP2002350867A JP2002350867A JP2004181341A JP 2004181341 A JP2004181341 A JP 2004181341A JP 2002350867 A JP2002350867 A JP 2002350867A JP 2002350867 A JP2002350867 A JP 2002350867A JP 2004181341 A JP2004181341 A JP 2004181341A
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- nonwoven fabric
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- 239000000835 fiber Substances 0.000 title claims abstract description 69
- 239000011230 binding agent Substances 0.000 title claims abstract description 52
- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 44
- 229920000728 polyester Polymers 0.000 title claims abstract description 43
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000000306 component Substances 0.000 claims description 13
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 12
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 8
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 239000008358 core component Substances 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 239000006185 dispersion Substances 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000009477 glass transition Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000009987 spinning Methods 0.000 description 4
- 240000000907 Musa textilis Species 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002964 rayon Substances 0.000 description 3
- 229920001634 Copolyester Polymers 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 244000269722 Thea sinensis Species 0.000 description 2
- 229920002978 Vinylon Polymers 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- DNIAPMSPPWPWGF-VKHMYHEASA-N (+)-propylene glycol Chemical compound C[C@H](O)CO DNIAPMSPPWPWGF-VKHMYHEASA-N 0.000 description 1
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 1
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- MMINFSMURORWKH-UHFFFAOYSA-N 3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical group O=C1OCCOC(=O)C2=CC=C1C=C2 MMINFSMURORWKH-UHFFFAOYSA-N 0.000 description 1
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- CNGYZEMWVAWWOB-VAWYXSNFSA-N 5-[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2-[(e)-2-[4-[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]ethenyl]benzenesulfonic acid Chemical compound N=1C(NC=2C=C(C(\C=C\C=3C(=CC(NC=4N=C(N=C(NC=5C=CC=CC=5)N=4)N(CCO)CCO)=CC=3)S(O)(=O)=O)=CC=2)S(O)(=O)=O)=NC(N(CCO)CCO)=NC=1NC1=CC=CC=C1 CNGYZEMWVAWWOB-VAWYXSNFSA-N 0.000 description 1
- 241000269799 Perca fluviatilis Species 0.000 description 1
- 229920001283 Polyalkylene terephthalate Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009986 fabric formation Methods 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000006224 matting agent Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、斑の少ない不織布性能（強度など）に優れたフィルター用湿式不織布、および、該不織布が得られるポリエステル系バインダー繊維に関する。
【０００２】
【従来の技術】
従来、濾紙に代表される液体用フィルター、空気清浄機や自動車の排気フィルターなどに代表される気体用フィルターなどに用いられるフィルター用湿式不織布は、木材パルプ、アバカ、レーヨンおよびビニロンが主原料として使用され、ポリビニルアルコール繊維をバインダー繊維として使用したものが多かった。これに対して近年は、湿式不織布の密度を下げ、疎水性や寸法安定性等の物性を向上させるため、ポリエステル繊維を混抄したものが多くなっており、フィルターの圧力損失、捕集効率などの性能を向上させるためには、さらにポリエステル繊維の湿式不織布中の混抄割合を増やす方向にある。しかし、従来多用されていたポリビニルアルコール繊維状バインダーでは、ポリエステル繊維を接着する力に乏しく、また湿潤強力が低いという問題があった。従って、ポリエステル繊維混抄系不織布のバインダー繊維としては、ポリエステル系バインダー繊維が好適なバインダーとして使用されるようになってきた。かかるポリエステル系バインダー繊維は、木材パルプやレーヨンとの接着性も良好であり、ポリエステル繊維混抄系不織布に好適なバインダー繊維として多くの提案がなされている。例えば特許文献１には、融点が２２０℃以上のポリアルキレンテレフタレートを繊維形成性成分とし、ガラス転移点が５０〜１００℃の範囲でかつ結晶融点を持たない非晶性共重合ポリエステルをバインダー成分とする繊維が、湿式抄紙用バインダー繊維として提示されている。しかしながら、本発明者の検証によると、このような従来のポリエステル系バインダー繊維を用いて湿式不織布を成形した場合は、地合い斑が大きく、不織布性能（強度など）でも不十分なものしか得られない。よって、緻密性や均一性が要求されたり、高い圧力がかかったりする液体用、気体用フィルターなどとして用いるには更なる改善が必要である。
【０００３】
【特許文献１】
特開２００２−２２７０８９号公報
【０００４】
【発明が解決しようとする課題】
本発明は、上記の従来技術を背景になされたもので、その目的は、抄紙工程の乾燥・熱処理時の収縮を少なく、地合い斑が小さく、不織布性能（強度など）に優れたフィルター用湿式不織布が得られるポリエステル系バインダー繊維およびそれを用いたフィルター用湿式不織布を提供することにある。
【０００５】
【課題を解決するための手段】
本発明者は鋭意検討を重ねた結果、上記目的は、「繊維長が３〜２５ｍｍ、下記に定義するシート面積収縮率が３０％以下であるフィルター用湿式不織布に用いるポリエステル系バインダー繊維」によって達成されることを見出した。
＜シート面積収縮率＞
熊谷理機工業株式会社製角型シートマシンを使って、バインダー繊維８０重量％とＮＢＫＰ２０重量％を水中でよく撹拌・混合して分散させ、大きさが約２５ｃｍ×約２５ｃｍで、目付けが約５０ｇ／ｍ２のシートを作成する。次に、該シートを室温中で一昼夜以上乾燥させた後、孔を開けたテフロンシートの上に載せ、該シートを熱風循環式乾燥機にて１２０℃、５分間弛緩収縮処理を行う。収縮処理前のシートの面積Ａ０と収縮処理後の面積Ａ１から下記の式により求め、シート面積収縮率とする。
シート面積収縮率（％）＝｛（Ａ０−Ａ１）／Ａ０｝×１００
さらに、本発明によれば、「上記ポリエステル系バインダー繊維を５〜５０重量％含有してなるフィルター用湿式不織布」が提案される。
【０００６】
【発明の実施の形態】
以下、本発明の実施形態について詳細に説明する。
本発明のポリエステル系バインダー繊維は、先に定義したシート面積収縮率が３０％以下であり、好ましくは２５％以下である。面積収縮率が３０％を越えると、乾燥時に地合の斑が発生し、紙の強力が低いものとなる。
【０００７】
また、上記バインダー繊維の繊維長は３〜２５ｍｍ、好ましくは５〜２０ｍｍである。繊維長が３ｍｍより短くなると、バインダー繊維を製造する際の安定した繊維の切断が難しくなり、また、フィルター用不織布の強力も低くなる。逆に繊維長が２５ｍｍより長くなると、抄紙時の繊維の水中分散が難しくなり、地合斑の大きいフィルター用不織布になる。
【０００８】
本発明のポリエステル系バインダー繊維は、芯鞘型の複合繊維とすることが好ましい。芯成分としては、主たる繰り返し単位の８５モル％以上がエチレンテレフタレートからなるポリエステルを好ましく用いることができる。エチレンテレフタレート単位が８５モル％より少なくなると、融点等の熱的特性が低下するため好ましくない。該ポリエステルは艶消し剤、顔料、蛍光増白剤、紫外線吸収剤等の公知の添加剤を含んでいてもよい。一方、鞘のバインダー成分としては、ポリエチレンテレフタレート系の非晶性共重合ポリエステルを好ましく用いることができる。該共重合ポリエステルは、テレフタル酸、イソフタル酸、５−ナトリウムスルホイソフタル酸、アジピン酸、セバシン酸等の酸成分と、エチレングリコール、１，３−プロパンジオール、１，４−ブタンジオール、ジエチレングリコール等のジオール成分との共重合によって得られるが、特にテレフタル酸、イソフタル酸、エチレングリコールおよびジエチレングリコールから得られる共重合ポリエステルがコスト面から好ましい。
【０００９】
本発明のポリエステル系バインダー繊維は常法のポリエステル複合繊維製造工程で得ることができる。すなわち、バインダー成分が鞘成分を形成するような紡糸ノズルから吐出された複合ポリマー流に冷却風を当て、紡糸速度１５００ｍ／分以下で引取り、未延伸糸を得る。得られた未延伸糸を引き揃えてトウとなし、バインダー成分の非晶性共重合ポリエステルのガラス転移点より高い温度の温水中で延伸熱処理して、シート面積収縮率が３０％以下のバインダー繊維とする。なお、ガラス転移点より高い温度で延伸熱処理すると、バインダー成分が軟化して膠着を起こし易くなるため、膠着防止の目的で、ポリエーテル・ポリエステル共重合体を延伸熱処理前にポリエステル系バインダー繊維の表面に付与してもよい。温水中で延伸熱処理された湿潤トウは、ドラム式カッターへ移送され、所定の長さに切断され、バインダー繊維となる。
【００１０】
本発明のフィルター用湿式不織布は、本発明のポリエステル系バインダー繊維を５〜５０重量％含有した湿式不織布を熱処理してなる不織布である。
【００１１】
本発明の不織布は、本発明のポリエステル系バインダー繊維以外に不織布原料成分として少なくともパルプを含んでいるものを対象とする。上記不織布は、パルプ以外の成分として、レーヨン、ビニロン繊維、アバカ、ポリエステル系繊維などを含んでいても良い。
【００１２】
本発明の不織布は、常法の湿式抄紙工程で製造される。すなわち、パルプなどの製紙原料とポリエステル系バインダー繊維とをパルパーに投入して攪拌・分散し、抄き網に供給し、湿紙となし、乾燥工程を経て、ロール状に巻取りフィルター用湿式不織布とする。抄き網は円網、短網が一般的であるが、長網、ロトフォーマー、ハイドロフォーマー、パーチフォーマーなどでも構わない。乾燥工程は複数の回転加熱ローラー式（多筒式）あるいはヤンキードラム式のいずれでも構わない。なお、乾燥筒の間に全く把持されないオープンゾーンが存在する多筒式乾燥工程では、通常、構成原料の収縮特性などが不適の場合に、オープンゾーンでのウェブ破断あるいは不織布地合斑発生などの問題が発生するが、本発明のポリエステル系バインダー繊維では、他の構成原料との熱収縮バランスが良いので、多筒式乾燥工程を用いても、このような問題は発生しない。
【００１３】
上記の不織布製造工程で、パルプなどの不織布原料と混抄して使用される本発明のポリエステル系バインダー繊維が、均一な地合で優れた強力を有するフィルター用不織布の形成に重要な機能を発揮する。
【００１４】
本発明において、不織布中のバインダー繊維の配合比率は５〜５０重量％、より好ましくは１０〜４０重量％である。配合比率が５重量％より少なくなると、得られたフィルター用不織布の強力が低下する。逆に５０重量％を越えると、フィルター用不織布の風合が硬くなる。
【００１５】
【実施例】
以下、実施例により、本発明を更に具体的に説明する。なお、実施例における各項目は次の方法で測定した。
（１）固有粘度
オルソクロロフェノールを溶媒として使用し３５℃で測定した。
（２）ガラス転移点（Ｔｇ）、融点（Ｔｍ）
ＴＡインスツルメント・ジャパン（株）社製のサーマル・アナリスト２２００を使用し、昇温速度２０℃／分で測定した。
（３）シート面積収縮率
熊谷理機工業株式会社製角型シートマシンを使って、バインダー繊維８０重量％とＮＢＫＰ２０重量％とを水中でよく撹拌・混合して分散させ、大きさが約２５ｃｍ×約２５ｃｍで、目付けが約５０ｇ／ｍ２のシートを作成する。次に、該シートを室温中で一昼夜以上乾燥させた後、孔を開けたテフロンシートの上に載せ、該シートを１２０℃の熱風循環式乾燥機中で５分間弛緩収縮処理を行う。収縮処理前のシートの面積Ａ０と収縮処理後の面積Ａ１から下記の式により求め、シート面積収縮率とした。
シート面積収縮率（％）＝｛（Ａ０−Ａ１）／Ａ０｝×１００
（４）引張り強力
ＪＩＳ−Ｐ−８１１３に示される方法で測定した。
（５）湿潤引張り強力
ＪＩＳ−Ｐ−８１３５に示される方法で測定した。
（６）地合、風合
実施例１〜３および比較例１は市販されている自動車用フィルターを、それ以外は市販されているティーバッグを比較対照品として、官能判定した。
【００１６】
［実施例１〜３、比較例１］
芯成分として固有粘度が０．６３、Ｔｇが６７℃、Ｔｍが２５５℃のポリエチレンテレフタレート、鞘成分としてテレフタル酸が６０モル％、イソフタル酸が４０モル％、エチレングリコールが９６モル％、ジエチレングリコールが４モル％の割合で共重合された、固有粘度が０．５５、Ｔｇが６５℃の非晶性共重合ポリエステルを用い、各々のペレットを乾燥後、芯鞘型複合溶融紡糸装置に供給し、孔数が９００個の口金を用い、重量比５０／５０の複合比率、紡糸温度２７５℃、吐出量７１０ｇ／分、紡糸速度１２００ｍ／分の条件下で引取り、未延伸糸を得た。尚、引取り前にポリエーテル・ポリエステル共重合体の付着量が０．１％となるようにエマルジョンをオイリングローラーで付与した。得られた未延伸糸を引き揃えて約４５万デシテックスのトウとなし、温水温度（延伸熱処理温度）を変更して３．１倍に延伸した後、約１５％の水分率となるように絞った後、５ｍｍの長さに切断し、単繊維繊度が約２．２デシテックスの収縮率が異なるバインダー繊維を得た。次いで、得られたバインダー繊維３０重量％、通常の延伸熱処理されたポリエチレンテレフタレート繊維（繊度が３．３デシテックス、繊維長が５ｍｍ）２０重量％、ＮＢＫＰ５０重量％の配合比率とし、通常の短網抄紙機で抄紙し、１３０℃の多筒式乾燥機で乾燥し、秤量が約１６０ｇ／ｍ２で厚さが０．８〜０．９ｍｍの不織布を得た。バインダー繊維の特性と、抄紙調子、得られた不織布の特性の関係を表１に示す。
【００１７】
【表１】
［実施例４〜７、比較例２］
実施例２の切断前のトウを使って、繊維長の異なるバインダー繊維を得た。得られたバインダー繊維３０重量％、アバカ５０重量％、ＮＢＫＰ２０重量％の配合比率として、通常の円網抄紙機で抄紙し、１３０℃のヤンキー式乾燥機で乾燥し、秤量が約２２ｇ／ｍ２のティーバッグ用不織布を得た。尚、繊維長２．５ｍｍはドラム式カッターで切断時の抵抗が非常に大きく、また得られたバインダー繊維中にも塊状の欠点が多数見出されたため、評価は実施しなかった。得られた結果を表２に示す。
【００１９】
【表２】
［実施例８〜１０］
実施例３のバインダー繊維を用い、配合比率を変更して実施例４と同じ要領でティーバッグ用不織布を作って評価し、表３の結果を得た。実施例８の不織布は湿潤引張強力が低めではあるが、実用可能なレベルであった。
【００２１】
【表３】
【発明の効果】
本発明のポリエステル系バインダー繊維によれば、フィルター用不織布を製造する際の収縮が小さいため、均一な地合で強力に優れたフィルター用不織布を得ることができる。さらに、本発明のフィルター用不織布は、従来よりも優れた均一性、強力を有しているため、緻密性、均一性が必要なフィルターや高い圧力がかかるフィルターなどの用途に幅広く利用できるものである。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wet nonwoven fabric for a filter excellent in nonwoven fabric performance (strength and the like) with little unevenness, and a polyester-based binder fiber from which the nonwoven fabric is obtained.
[0002]
[Prior art]
Conventionally, wood pulp, abaca, rayon and vinylon are used as the main raw materials for wet filters for filters used for liquid filters such as filter paper and gas filters such as air purifiers and automobile exhaust filters. In many cases, polyvinyl alcohol fibers were used as binder fibers. On the other hand, in recent years, in order to reduce the density of wet-type nonwoven fabrics and improve physical properties such as hydrophobicity and dimensional stability, many types of polyester fibers are mixed, and pressure loss of filters, collection efficiency, etc. In order to improve the performance, there is a tendency to further increase the mixing ratio of the polyester fiber in the wet nonwoven fabric. However, the polyvinyl alcohol fibrous binder which has been frequently used in the past has a problem that the bonding strength of the polyester fiber is poor and the wet strength is low. Therefore, as a binder fiber of the polyester fiber mixed nonwoven fabric, a polyester binder fiber has been used as a suitable binder. Such polyester-based binder fibers have good adhesion to wood pulp and rayon, and many proposals have been made as binder fibers suitable for polyester fiber-mixed nonwoven fabrics. For example, Patent Document 1 discloses that a polyalkylene terephthalate having a melting point of 220 ° C. or more is used as a fiber-forming component, and an amorphous copolyester having a glass transition point in the range of 50 to 100 ° C. and having no crystalline melting point is used as a binder component. Fibers have been proposed as binder fibers for wet papermaking. However, according to the verification of the present inventor, when a wet-type nonwoven fabric is formed using such a conventional polyester-based binder fiber, formation unevenness is large and only an insufficient nonwoven fabric performance (strength, etc.) can be obtained. . Therefore, further improvement is required for use as a filter for liquid or gas which is required to have high density and uniformity or to apply a high pressure.
[0003]
[Patent Document 1]
JP-A-2002-227089
[Problems to be solved by the invention]
The present invention has been made on the background of the above-mentioned conventional technology, and its object is to reduce the shrinkage during drying and heat treatment in the papermaking process, to reduce the formation unevenness, and to have excellent nonwoven fabric performance (strength, etc.) wet nonwoven fabric for filters. To provide a polyester-based binder fiber obtained from the above and a wet nonwoven fabric for a filter using the same.
[0005]
[Means for Solving the Problems]
As a result of intensive studies, the inventor has achieved the above object by "a polyester binder fiber used for a wet nonwoven fabric for a filter having a fiber length of 3 to 25 mm and a sheet area shrinkage of 30% or less as defined below". Found to be.
<Sheet area shrinkage>
Using a square sheet machine manufactured by Kumagai Riki Kogyo Co., Ltd., 80% by weight of binder fiber and 20% by weight of NBKP are well stirred and mixed in water to disperse. The size is about 25 cm × about 25 cm, and the basis weight is about 50 g. / m to create a second sheet. Next, after drying the sheet at room temperature for one day or more, the sheet is placed on a perforated Teflon sheet, and the sheet is subjected to a relaxation shrinkage treatment at 120 ° C. for 5 minutes by a hot air circulation type dryer. Calculated by the following equation shrinking treatment area A 0 of the previous sheet and the area A 1 of the post-shrinking treatment, the sheet area shrinkage.
Sheet area shrinkage (%) = {(A 0 −A 1 ) / A 0 } × 100
Further, according to the present invention, a "wet nonwoven fabric for a filter containing the above-mentioned polyester-based binder fiber in an amount of 5 to 50% by weight" is proposed.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
The polyester binder fiber of the present invention has a sheet area shrinkage rate of 30% or less as defined above, and preferably 25% or less. If the area shrinkage exceeds 30%, unevenness of formation will occur during drying, and the strength of the paper will be low.
[0007]
The fiber length of the binder fiber is 3 to 25 mm, preferably 5 to 20 mm. When the fiber length is shorter than 3 mm, it becomes difficult to stably cut the fiber when producing the binder fiber, and the strength of the nonwoven fabric for a filter also decreases. Conversely, when the fiber length is longer than 25 mm, it is difficult to disperse the fibers in water during papermaking, and a nonwoven fabric for a filter having large formation unevenness is obtained.
[0008]
The polyester-based binder fiber of the present invention is preferably a core-sheath type composite fiber. As the core component, a polyester in which 85 mol% or more of the main repeating unit is composed of ethylene terephthalate can be preferably used. If the content of the ethylene terephthalate unit is less than 85 mol%, the thermal characteristics such as the melting point deteriorate, which is not preferable. The polyester may contain known additives such as a matting agent, a pigment, a fluorescent brightener, and an ultraviolet absorber. On the other hand, as the binder component of the sheath, a polyethylene terephthalate-based amorphous copolymerized polyester can be preferably used. The copolymerized polyester is an acid component such as terephthalic acid, isophthalic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid and ethylene glycol, 1,3-propanediol, 1,4-butanediol, diethylene glycol and the like. Although it can be obtained by copolymerization with a diol component, a copolymer polyester obtained from terephthalic acid, isophthalic acid, ethylene glycol and diethylene glycol is particularly preferable in terms of cost.
[0009]
The polyester-based binder fiber of the present invention can be obtained by a conventional polyester composite fiber production process. That is, a cooling air is applied to the composite polymer stream discharged from the spinning nozzle in which the binder component forms a sheath component, and the composite polymer stream is drawn at a spinning speed of 1500 m / min or less to obtain an undrawn yarn. The obtained undrawn yarns are aligned to form a tow, and a drawing heat treatment is performed in hot water at a temperature higher than the glass transition point of the amorphous copolyester as a binder component, and a binder fiber having a sheet area shrinkage of 30% or less. And In addition, when the drawing heat treatment is performed at a temperature higher than the glass transition point, the binder component is softened, and the sticking is easily caused. Therefore, for the purpose of preventing the sticking, the surface of the polyester-based binder fiber is subjected to the polyether / polyester copolymer before the drawing heat treatment. May be provided. The wet tow stretched and heat-treated in warm water is transferred to a drum type cutter, cut into a predetermined length, and becomes binder fibers.
[0010]
The wet nonwoven fabric for a filter of the present invention is a nonwoven fabric obtained by heat-treating a wet nonwoven fabric containing 5 to 50% by weight of the polyester binder fiber of the present invention.
[0011]
The nonwoven fabric of the present invention is intended to include at least pulp as a raw material component of the nonwoven fabric in addition to the polyester binder fiber of the present invention. The nonwoven fabric may contain rayon, vinylon fiber, abaca, polyester fiber, and the like as components other than pulp.
[0012]
The nonwoven fabric of the present invention is produced by a conventional wet papermaking process. That is, a papermaking raw material such as pulp and a polyester-based binder fiber are put into a pulper, stirred and dispersed, supplied to a paper net, made into a wet paper, passed through a drying step, wound up in a roll form, and wet-laid for a filter. And The net is generally a circular net or a short net, but may be a long net, a rotoformer, a hydroformer, a perch former, or the like. The drying step may be any of a plurality of rotary heating roller type (multi-cylinder type) or a Yankee drum type. In addition, in the multi-cylinder drying step in which there is an open zone that is not gripped at all between the drying cylinders, usually, when the shrinkage characteristics of the constituent materials are inappropriate, such as breakage of the web in the open zone or occurrence of non-woven fabric formation unevenness. Although a problem occurs, the polyester binder fiber of the present invention has a good heat shrinkage balance with other constituent materials, and thus, even if a multi-cylinder drying step is used, such a problem does not occur.
[0013]
In the above nonwoven fabric manufacturing process, the polyester-based binder fiber of the present invention, which is used as a mixture with a nonwoven material such as pulp, exhibits an important function in forming a nonwoven fabric for a filter having excellent strength in a uniform formation. .
[0014]
In the present invention, the blending ratio of the binder fiber in the nonwoven fabric is 5 to 50% by weight, more preferably 10 to 40% by weight. When the compounding ratio is less than 5% by weight, the strength of the obtained nonwoven fabric for a filter is reduced. Conversely, if it exceeds 50% by weight, the hand of the nonwoven fabric for a filter becomes hard.
[0015]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. Each item in the examples was measured by the following method.
(1) Intrinsic viscosity Orthochlorophenol was used as a solvent and measured at 35 ° C.
(2) Glass transition point (Tg), melting point (Tm)
The measurement was performed at a heating rate of 20 ° C./min using a thermal analyst 2200 manufactured by TA Instruments Japan Co., Ltd.
(3) Sheet area shrinkage ratio Using a square sheet machine manufactured by Kumagai Riki Kogyo Co., Ltd., 80% by weight of binder fiber and 20% by weight of NBKP are well stirred and mixed in water to be dispersed, and the size is about 25 cm × A sheet of about 25 cm with a basis weight of about 50 g / m 2 is made. Next, after drying the sheet at room temperature for one day or more, the sheet is placed on a perforated Teflon sheet, and the sheet is subjected to a relaxation shrinkage treatment in a hot air circulating dryer at 120 ° C. for 5 minutes. Calculated by the following equation shrinking treatment area A 0 of the previous sheet and the area A 1 of the post-shrinking treatment, and the sheet area shrinkage.
Sheet area shrinkage (%) = {(A 0 −A 1 ) / A 0 } × 100
(4) Tensile strength Measured according to the method shown in JIS-P-8113.
(5) Wet tensile strength Measured by the method shown in JIS-P-8135.
(6) Texture and Feeling In Examples 1 to 3 and Comparative Example 1, a commercially available automotive filter was used, and other than that, a commercially available tea bag was used as a comparative control to judge the sensory evaluation.
[0016]
[Examples 1 to 3, Comparative Example 1]
Polyethylene terephthalate having an intrinsic viscosity of 0.63, Tg of 67 ° C. and Tm of 255 ° C. as a core component, 60 mol% of terephthalic acid, 40 mol% of isophthalic acid, 96 mol% of ethylene glycol, and 4 mol of diethylene glycol as a sheath component. Amorphous copolymerized polyester having an intrinsic viscosity of 0.55 and a Tg of 65 ° C., copolymerized at a ratio of mol%, was dried, and each of the pellets was supplied to a core-in-sheath composite melt spinning apparatus. An undrawn yarn was obtained using 900 ferrules under the conditions of a composite ratio of 50/50 by weight, a spinning temperature of 275 ° C., a discharge rate of 710 g / min, and a spinning speed of 1200 m / min. Before taking over, the emulsion was applied with an oiling roller so that the adhesion amount of the polyether / polyester copolymer was 0.1%. The obtained undrawn yarn is drawn to a tow of about 450,000 dtex, drawn 3.1 times by changing the hot water temperature (drawing heat treatment temperature), and then squeezed to a water content of about 15%. After that, the fiber was cut into a length of 5 mm to obtain binder fibers having a single fiber fineness of about 2.2 decitex and different shrinkage rates. Next, the blending ratio of 30% by weight of the obtained binder fiber, 20% by weight of a normal stretched and heat-treated polyethylene terephthalate fiber (a fineness of 3.3 decitex, and a fiber length of 5 mm) and 50% by weight of NBKP was used. The paper was made by a machine and dried by a multi-cylinder dryer at 130 ° C. to obtain a nonwoven fabric having a weight of about 160 g / m 2 and a thickness of 0.8 to 0.9 mm. Table 1 shows the relationship between the properties of the binder fiber, the papermaking condition, and the properties of the obtained nonwoven fabric.
[0017]
[Table 1]
[Examples 4 to 7, Comparative Example 2]
Using the tow before cutting of Example 2, binder fibers having different fiber lengths were obtained. The obtained binder fiber was 30% by weight, abaca was 50% by weight, and NBKP was 20% by weight. The blending ratio was made by using a conventional web paper machine and dried by a Yankee dryer at 130 ° C., and the weight was about 22 g / m 2. Was obtained. The evaluation was not carried out because the fiber length of 2.5 mm had a very high resistance at the time of cutting with a drum type cutter, and a large number of massive defects were found in the obtained binder fibers. Table 2 shows the obtained results.
[0019]
[Table 2]
[Examples 8 to 10]
Using the binder fiber of Example 3 and changing the mixing ratio, a nonwoven fabric for a tea bag was prepared and evaluated in the same manner as in Example 4, and the results shown in Table 3 were obtained. Although the nonwoven fabric of Example 8 had a low wet tensile strength, it was at a practical level.
[0021]
[Table 3]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the polyester-type binder fiber of this invention, since shrinkage at the time of producing a nonwoven fabric for filters is small, a nonwoven fabric for filters excellent in uniform formation and strong can be obtained. Furthermore, since the nonwoven fabric for filters of the present invention has better uniformity and strength than before, it can be widely used for applications such as filters requiring denseness and uniformity and filters under high pressure. is there.
Claims (3)
＜シート面積収縮率＞
熊谷理機工業株式会社製角型シートマシンを使って、バインダー繊維８０重量％とＮＢＫＰ２０重量％を水中でよく撹拌・混合して分散させ、大きさが約２５ｃｍ×約２５ｃｍで、目付けが約５０ｇ／ｍ２のシートを作成する。次に、該シートを室温中で一昼夜以上乾燥させた後、孔を開けたテフロンシートの上に載せ、該シートを熱風循環式乾燥機にて１２０℃、５分間弛緩収縮処理を行う。収縮処理前のシートの面積Ａ０と収縮処理後の面積Ａ１から下記の式により求め、シート面積収縮率とする。
シート面積収縮率（％）＝｛（Ａ０−Ａ１）／Ａ０｝×１００A polyester-based binder fiber having a fiber length of 3 to 25 mm and a sheet area shrinkage defined below of 30% or less, used for a wet nonwoven fabric for a filter.
<Sheet area shrinkage>
Using a square sheet machine manufactured by Kumagai Riki Kogyo Co., Ltd., 80% by weight of binder fiber and 20% by weight of NBKP are well stirred and mixed in water to disperse. The size is about 25 cm × about 25 cm, and the basis weight is about 50 g. / m to create a second sheet. Next, after drying the sheet at room temperature for one day or more, the sheet is placed on a perforated Teflon sheet, and the sheet is subjected to a relaxation shrinkage treatment at 120 ° C. for 5 minutes by a hot air circulation type dryer. Calculated by the following equation shrinking treatment area A 0 of the previous sheet and the area A 1 of the post-shrinking treatment, the sheet area shrinkage.
Sheet area shrinkage (%) = {(A 0 −A 1 ) / A 0 } × 100
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| JP2002350867A JP2004181341A (en) | 2002-12-03 | 2002-12-03 | Wet nonwoven fabric for filter and polyester binder fiber for use therein |
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| JP2002350867A JP2004181341A (en) | 2002-12-03 | 2002-12-03 | Wet nonwoven fabric for filter and polyester binder fiber for use therein |
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| JP2004181341A true JP2004181341A (en) | 2004-07-02 |
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