JP7032963B2 - フィルター補強材及びこれを含む脱臭フィルター用濾材 - Google Patents
フィルター補強材及びこれを含む脱臭フィルター用濾材 Download PDFInfo
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- JP7032963B2 JP7032963B2 JP2018043778A JP2018043778A JP7032963B2 JP 7032963 B2 JP7032963 B2 JP 7032963B2 JP 2018043778 A JP2018043778 A JP 2018043778A JP 2018043778 A JP2018043778 A JP 2018043778A JP 7032963 B2 JP7032963 B2 JP 7032963B2
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/01—Deodorant compositions
- A61L9/014—Deodorant compositions containing sorbent material, e.g. activated carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0038—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions with means for influencing the odor, e.g. deodorizing substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
- B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
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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
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2055—Carbonaceous material
- B01D39/2058—Carbonaceous material the material being particulate
- B01D39/2062—Bonded, e.g. activated carbon blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Landscapes
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Description
[1] 熱接着性短繊維を含むサーマルボンド不織布から構成される接着層と、
前記接着層の中で最も融点が低い熱接着性短繊維よりも融点が30℃以上高い高融点繊維を含む不織布から構成される補強層を有することを特徴とするフィルター補強材。
[2] 前記接着層は、5dtex以上の繊度差を有する2種以上の熱接着性短繊維を含む[1]に記載のフィルター補強材。
[3] 前記補強層は前記高融点繊維を、前記補強層を構成する繊維100重量%中、60重量%以上含む[1]または[2]に記載のフィルター補強材。
[4] 前記熱接着性短繊維の融点が80~150℃であり、
前記融点が80~150℃の熱接着性短繊維の含有率が、前記接着層を構成する繊維100重量%中、60~100重量%である[1]~[3]のいずれか1項に記載のフィルター補強材。
[5] 前記補強層を構成する繊維の平均繊度が、前記接着層を構成する繊維の平均繊度よりも大きい[1]~[4]のいずれか1項に記載のフィルター補強材。
[6] 前記接着層と前記補強層は熱融着により一体化されている[1]~[5]のいずれか1項に記載のフィルター補強材。
[7] 前記熱接着性短繊維が芯鞘構造、偏心構造、あるいはサイドバイサイド構造を有する複合繊維である[1]~[6]のいずれか1項に記載のフィルター補強材。
[8] [1]~[7]のいずれか1項に記載のフィルター補強材と、
前記フィルター補強材の接着層側に積層される吸着剤を含む吸着層と、
前記フィルター補強材と共に、前記吸着層を挟むように積層される基材を有することを特徴とする脱臭フィルター用濾材。
本発明では、接着層に使用される熱接着性短繊維と補強層に使用される高融点繊維との融点差が重要である。融点差を30℃以上に保つことにより、接着層側では吸着層との接着強度向上が、補強層側ではプリーツ加工性向上(例えば、ヒートセット時の襞接着抑制)がそれぞれ可能となる。
(1)剛性の向上に寄与する;従来の接着剤は基本的に点接着であるため、フィルター補強材や脱臭フィルター用濾材の剛性向上には寄与しなかった。しかしながら、本発明ではサーマルボンド不織布を採用したことにより、サーマルボンド不織布自体の剛性が加わり、フィルター補強材や脱臭フィルター用濾材の剛性向上に貢献する。
(2)吸着剤の特性をより活かせる;前述の通り、従来の接着剤は点接着であるため、フィルター性能は発揮せず、脱臭フィルター用濾材のダスト捕集性能には寄与しなかった。しかしながら、サーマルボンド不織布を採用したことにより、接着層においてもフィルター性能が発揮されることとなった。本構成により、吸着層中の吸着剤に対するダスト付着量を低減でき、吸着剤の性能をより活かすことができる。
(3)プリーツ形成時の割れ抑制に有効である;従来の接着剤は点接着であるが故、接着剤が吸着剤に触れると吸着剤付近に凝集する傾向があり、プリーツ形成時の襞折りの衝撃で接着点が割れ、吸着剤が脱臭フィルター用濾材から脱落することがあった。しかしながら、サーマルボンド不織布を採用することで、従来の接着剤とくらべて繊維間が密になり、吸着剤をしっかりと絡めて接着することが可能となった。本構成により、襞折りの衝撃で接着点が割れ難くなり、吸着剤の脱落も抑制できるようになった。
<<接着層>>
本発明に係るフィルター補強材は、熱接着性短繊維を含むサーマルボンド不織布から構成される接着層を有する。該接着層は、吸着剤を含む吸着層とフィルター補強材を接合する際の接着機能を担う。前記接着層は、同一種の熱接着性短繊維を含んでいてもよく、異種の熱接着性短繊維を2種以上含んでいてもよい。
複合繊維における低融点成分は、変性ポリエステルまたは共重合ポリエステルが好ましい。前記ポリエチレンテレフタレートの共重合成分としては、例えば、イソフタル酸、アジピン酸、ジエチレングリコール、ヘキサンジオール等が例示できる。該低融点成分の融点は、好ましくは80℃以上、より好ましくは85℃以上、更に好ましくは90℃以上であり、好ましくは170℃以下、より好ましくは160℃以下、更に好ましくは150℃以下である。
通常、低融点成分と高融点成分の重量比は好ましくは30:70~70:30であり、より好ましくは40:60~60:40、更に好ましくは45:55~55:45である。
本発明に係るフィルター補強材は、前記接着層の中で最も融点が低い熱接着性短繊維よりも融点が30℃以上高い高融点繊維を含む不織布から構成される補強層を有する。前記補強層は、脱臭フィルター用濾材における最流入層または最流出層となる。
前述の通り、本発明では接着層としてサーマルボンド不織布を採用したことにより、接着層においてもフィルター性能が発揮されることとなった。また、前記補強層は、脱臭フィルター用濾材における最流入層または最流出層(好ましくは最流入層)となるため、接着層と補強層では平均繊度を変え、接着層と補強層間に繊維密度の勾配が設けられていることが好ましい。例えば、前記補強層を構成する繊維の平均繊度は、前記接着層を構成する繊維の平均繊度よりも大きいことが望ましい態様である。脱臭フィルター用濾材においては、接着層側に吸着層が設けられるため、補強層側が最流入層となることが多い。その場合、粒径の大きなダストは、補強層、接着層の順に補足され、吸着剤に直接付着することが抑制できる。
なお本発明において、各層に含まれる繊維の平均繊度は、各層に含まれる全繊維の重量平均で求めることとする。
またフィルター補強材の厚さは、好ましくは0.1~3.5mm、より好ましくは0.2~3.0mm、更に好ましくは0.3~2.5mmである。
フィルター補強材の目付及び厚さが前記範囲内であれば、適度な剛性を有し、またフィルター補強材での通気量低下を抑制できるため、脱臭フィルター用濾材における圧力損失を小さくできる。特にフィルター補強材は薄いほど、プリーツの山数を多くでき、更に襞接触による構造圧損を抑制できるため好ましい。
フィルター補強材の製造方法は、接着層用の繊維ウェブ及び補強層用の繊維ウェブを積層する工程、及び積層された繊維ウェブに熱処理を施すサーマルボンド工程、を有する。
<<基材>>
脱臭フィルター用濾材に用いられる基材としては、通気性を有する織布または不織布が好ましく、特に繊維間が密であることから不織布が好ましい。前記不織布としては、サーマルボンド不織布、ニードルパンチ不織布、スパンレース不織布等の乾式不織布;スパンボンド不織布;メルトブロー不織布;湿式不織布;等が用途に応じて適宜好ましく用いられる。前記基材は樹脂加工されていてもよい。また前記基材はエレクトレット加工されていてもよい。
吸着層に含まれる吸着剤としては、粉末状、粒状、破砕状、造粒状、ビーズ状の各種吸着剤が挙げられるが、幅広く種々のガスを吸着できる活性炭;シリカゲル;ゼオライト;等が好ましく、ヤシガラ系、木質系、石炭系、ピッチ系等の活性炭が好適である。表面観察によって見られる内部への導入孔いわゆるマクロ孔数は多い方がよい。その理由は、活性炭と後述する接着剤(例えば、熱可塑性粉末樹脂)から混合粉粒体をつくった際に、熱可塑性粉末樹脂が活性炭表面を被覆しても、熱プレス加工時に細孔内部からのガス脱着により、吸着可能な細孔を開放することができるためである。また、活性炭表面はある程度粗い方が溶融した樹脂の流動性も悪くなり、吸着性能低下を抑えることができる。
脱臭フィルター用濾材は、抗菌剤、抗かび剤、抗ウィルス剤、難燃剤等の付随的機能を有する成分等を含めて構成してもよい。これらの成分は繊維類や不織布中に練り込んでも、後加工で添着、および担持して付与してもよい。例えば、難燃剤を含めて構成することにより、FMVSS.302で規定されている遅燃性の基準やUL難燃規格に合致した脱臭フィルター用濾材を製造することが可能である。
1.目付:JIS L1913 6.2に準ず。
2.厚さ:JIS L1913 6.1.1A法に準じ、試験片にかける圧力を2g/cm2とする。
◎:剥離が全く発生せず、プリーツの山部・谷部の鋭角性がかなりあり、プリーツがかなり整然と揃っている。
○:剥離が発生せず、プリーツの山部・谷部の鋭角性があり、プリーツが整然と揃っている。
△:剥離がやや発生する、または剥離ぎみ部分が少しあり、プリーツの山部・谷部の鋭角性がない部分やプリーツが整然と揃っていない部分が少しある。(基準)
×:剥離が多く発生し加工できない、プリーツの山部・谷部の鋭角性がない部分やプリーツが整然と揃っていない部分が多くある。
○:襞接着が発生しない。プリーツ形状・加工性が良好である。
×:襞接着が発生した。プリーツ形状・加工性が悪かった。
◎:プリーツが等間隔に整然と整っており、プリーツ形状・加工性がかなり良好である。
○:プリーツが等間隔に殆ど整然と整っており、プリーツ形状・加工性が良好である。
△:プリーツが等間隔に整っていない部分が少しあるが、プリーツ形状・加工性は実使用できるレベルである。(基準)
×:プリーツが等間隔に整っていない部分が多くあり、プリーツ形状・加工性が悪かった。
◎:圧力損失低減率が5%超えであり、基準よりかなり良い。
○:圧力損失低減率が0%超え5%以下であり、基準と同等以上である。
△:基準。
×:圧力損失が基準よりも大きい。
なお圧力損失低減率(%)=(Ps’-Ps)/(Ps’)×100である。
◎:プリーツエアフィルターとしてかなり好適である。
○:プリーツエアフィルターとして好適である。
△:プリーツエアフィルターとして少し課題がある。(基準)
×:プリーツエアフィルターとして適していない。
接着層及び補強層として、それぞれ表に示す繊維及び重量比率で計量・混綿し、クロス繊維ウェブを形成し、積層した。積層後、200℃の熱処理温度で30秒間熱処理してフィルター補強材を製造した。
表に示す条件に変更したこと以外は、実施例1と同様にしてフィルター補強材及び脱臭フィルター用濾材を製造した。
補強層として、表に示す繊維及び重量比率で計量・混綿し、クロス繊維ウェブを形成して、200℃の熱処理温度で30秒間熱処理した。その上に、接着層としてポリエステル系熱接着性長繊維不織布(ダイナック:融点120℃)を積層し、140℃で熱処理してフィルター補強材を製造した。
Claims (8)
- 熱接着性短繊維を含むサーマルボンド不織布から構成される接着層と、
前記接着層の中で最も融点が低い熱接着性短繊維よりも融点が30℃以上高い高融点繊維を含む不織布から構成される補強層を有することを特徴とするフィルター補強材。 - 前記接着層は、5dtex以上の繊度差を有する2種以上の熱接着性短繊維を含む請求項1に記載のフィルター補強材。
- 前記補強層は前記高融点繊維を、前記補強層を構成する繊維100重量%中、60重量%以上含む請求項1または2に記載のフィルター補強材。
- 前記熱接着性短繊維の融点が80~150℃であり、
前記融点が80~150℃の熱接着性短繊維の含有率が、前記接着層を構成する繊維100重量%中、60~100重量%である請求項1~3のいずれか1項に記載のフィルター補強材。 - 前記補強層を構成する繊維の平均繊度が、前記接着層を構成する繊維の平均繊度よりも大きい請求項1~4のいずれか1項に記載のフィルター補強材。
- 前記接着層と前記補強層は熱融着により一体化されている請求項1~5のいずれか1項に記載のフィルター補強材。
- 前記熱接着性短繊維が芯鞘構造、偏心構造、あるいはサイドバイサイド構造を有する複合繊維である請求項1~6のいずれか1項に記載のフィルター補強材。
- 請求項1~7のいずれか1項に記載のフィルター補強材と、
前記フィルター補強材の接着層側に積層される吸着剤を含む吸着層と、
前記フィルター補強材と共に、前記吸着層を挟むように積層される基材を有することを特徴とする脱臭フィルター用濾材。
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