JP6455788B2 - 積層不織布および空気清浄機、ならびに積層不織布の製造方法 - Google Patents
積層不織布および空気清浄機、ならびに積層不織布の製造方法 Download PDFInfo
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- JP6455788B2 JP6455788B2 JP2015123809A JP2015123809A JP6455788B2 JP 6455788 B2 JP6455788 B2 JP 6455788B2 JP 2015123809 A JP2015123809 A JP 2015123809A JP 2015123809 A JP2015123809 A JP 2015123809A JP 6455788 B2 JP6455788 B2 JP 6455788B2
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Description
第1不織布1は帯電(永久帯電)している。すなわち、第1不織布1は、外部電界が存在しない状態において半永久的に電気分極を保持し、周囲に対して電界を形成している。そのため、ダストは、第1不織布1との間に生じる静電気力により、第1不織布1に捕捉される。また、第1不織布1は、種々の外部負荷から第2不織布2を保護する保護材としても機能する。
第2不織布2は、第1不織布1とともにダストを捕捉する機能を有する。第2不織布は、静電気力ではなく、主に、ダストのブラウン拡散、重力、さえぎり等の作用により、ダストを捕捉する。
積層不織布10は、さらに、第2不織布2の第1不織布1に対向しない主面2A側に第3不織布3を備えていても良い。第3不織布3は、例えば、積層不織布10の形状を保持する基材である。積層不織布10をプリーツ加工する場合、第1不織布が基材となって、プリーツの形状を保持する。
積層不織布10が、第1不織布1、第2不織布2および第3不織布3を含む場合、第1不織布1と第2不織布2とは、接着剤(図示せず)により接合されることが好ましい。この場合、第2不織布と第3不織布とは、接着剤を介さずに接合されていることが好ましい。第1不織布1と第2不織布2とを接合する接着剤が、第2不織布2側に偏在し易いためである。第2不織布と第3不織布との接合方法については、後述する。
本発明の空気清浄機100は、図2に例示されるように、濾材として用いる積層不織布10と、気体の吸い込み部101と、気体の吐き出し部102とを備える。積層不織布10は、主面1Bが吸い込み部101に対向するように、吸い込み部102と吐き出し部102との間に配置される。積層不織布10は、蛇腹状にプリーツ加工されて配置されても良い。
積層不織布10は、例えば、帯電した第1繊維1Fを含む第1不織布1を準備する第1準備工程と、第2繊維2Fの原料となる原料樹脂および原料樹脂を溶解させる溶媒を含む原料液22を準備する第2準備工程と、ターゲット(例えば、第3繊維3Fを含む第3不織布3)を準備する第3準備工程と、第3不織布3上で原料液を噴射して、原料液22から第2繊維2Fを生成させ、ターゲット(第3不織布3の一方の主面3B)に第2繊維2Fを堆積させて第2不織布2を形成する不織布形成工程と、第2不織布2のターゲットに対向しない主面(第3不織布3に対向しない主面2B)に、固形の接着剤35を散布する接着剤散布工程と、ターゲットの主面(2B)に散布された接着剤35を溶融させる加熱工程と、溶融した接着剤35を有する第2不織布2に第1不織布1を積層させる積層工程と、を含む方法により製造される。
各準備工程では、第1不織布1、繊維の原料となる原料樹脂と原料樹脂を溶解させる溶媒とを含む原料液22、および、第3不織布3を準備する。
原料液22は、原料樹脂および溶媒を含む。原料樹脂は第2繊維2Fの原料であり、溶媒は原料樹脂を溶解させる(以下、第1溶媒と称する)。原料液22における原料樹脂と第1溶媒との混合比率は、選定される原料樹脂の種類および第1溶媒の種類により異なる。原料液22における第1溶媒の割合は、例えば、60質量%から95質量%である。原料液22には、原料樹脂を溶解させる第1溶媒以外の溶媒や各種添加剤等が含まれていても良い。原料樹脂の種類は特に限定されず、第2繊維2Fの材質として例示した各ポリマーに対応するポリマーが例示できる。
次に、第3不織布3上で原料液22を噴射して、原料液22から第2繊維2Fを生成させ、第3不織布3の主面3Bに第2繊維2Fを堆積させて第2不織布2を形成する。このようにして第2繊維2Fを生成させる方法としては、例えば、乾式紡糸法、電界紡糸法等が挙げられる。なかでも、繊維径の小さな繊維を形成することができる点で、第2繊維2Fは電界紡糸法により形成されることが好ましい。電界紡糸法によれば、第2繊維2Fは、第3不織布3上に、一本以上の第2繊維2Fがランダムに重なった(あるいは、絡まった)繊維の集合体である不織布として堆積する。
続いて、第2不織布2の主面2Bに接着剤35を散布する。第2不織布2側に偏在し易い点で、接着剤35は固形の状態で散布されることが好ましい。固形とは、一定の形状を保持した状態であって、例えば、粉末、ペーストの状態である。接着剤35は、例えば、スプレー法、自由落下等により、第2不織布の主面2Bに散布される。
主面2Bに接着剤35を散布した後、第1不織布1を積層する前に、加熱装置42により接着剤35を加熱して溶融させる。加熱装置42は特に限定されず、公知のものを適宜選択すれば良い。加熱温度は、接着剤35の融点によって適宜設定すれば良く、例えば、100〜200℃である。
接着剤35を溶融した後、主面2B側から第2不織布2に第1不織布1を積層させる。第1不織布積層部205では、前駆体10aの上方から、第1不織布1が供給され、接着剤35を介して前駆体10aに積層される。第1不織布1が長尺である場合、第3不織布3と同様に、第1不織布1はリール52に巻き取られていても良い。この場合、第1不織布1は、リール52から捲き出されながら、第2不織布2に積層される。
以下、本発明の実施例を具体的に説明するが、本発明はこれらの実施例に限定されるものではない。なお、積層不織布は、図3に示すような製造装置200を用いて製造した。
第3不織布3としてセルロースを主体とする基材(T3:300μm、D3:15μm、単位体積当たりの質量:42g/m2、P3:80体積%)を使用した。電界紡糸法により、第3不織布3に第2繊維2F(D2:273nm)を含む第2不織布2(T2:2μm)を積層し、前駆体10aを得た。第2繊維の原料液としては、PESを20質量%含むDMAc溶液を用いた。第3不織布3上には、第2繊維2Fが0.69g/m2堆積していた。
Claims (7)
- 第1繊維を含む第1不織布と、
前記第1不織布に積層され、第2繊維を含む第2不織布と、
前記第2不織布の前記第1不織布に対向しない主面2A側に積層され、かつ、第3繊維を含む第3不織布と、
接着剤と、を備え、
前記第1不織布が帯電しており、
前記第1繊維の繊維径D1および前記第2繊維の繊維径D2が、D1>D2の関係を満たし、
前記接着剤が、前記第1不織布の前記第2不織布に対向する主面1Aから距離d1までの前記第1不織布側の領域R1、および、前記第2不織布の前記第1不織布に対向する主面2Bから距離d2までの前記第2不織布側の領域R2に存在しており、
前記距離d1および前記距離d2が、d1<d2の関係を満たす、積層不織布。 - 前記第1不織布の空隙率P1と、前記第3不織布の空隙率P3とが、P1<P3の関係を満たす、請求項1に記載の積層不織布。
- 前記空隙率P1が、60体積%以上、95体積%以下である、請求項2に記載の積層不織布。
- 前記第1不織布の厚みT1に対する前記距離d1の比:d1/T1が、0.1以上、0.5未満である、請求項1〜3のいずれか一項に記載の積層不織布。
- 前記第1不織布の厚みT1が、100μm以上、500μm以下であり、
前記第2不織布の厚みT2が、0.5μm以上、10μm以下であり、
前記第3不織布の厚みT3が、150μm以上、500μm以下である、請求項1〜4のいずれか一項に記載の積層不織布。 - 前記D2が、1μm未満である、請求項1〜5のいずれか一項に記載の積層不織布。
- 気体の吸い込み部と、
前記気体の吐き出し部と、
請求項1〜6のいずれか一項に記載の積層不織布と、を備え、
前記積層不織布が、前記第1不織布の前記第2不織布に対向しない主面1Bが前記吸い込み部に対向するように、前記吸い込み部と前記吐き出し部との間に配置される、空気清浄機。
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