JP4225408B2 - Dry pulp nonwoven fabric with integrated layered structure - Google Patents

Dry pulp nonwoven fabric with integrated layered structure Download PDF

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Publication number
JP4225408B2
JP4225408B2 JP2003010530A JP2003010530A JP4225408B2 JP 4225408 B2 JP4225408 B2 JP 4225408B2 JP 2003010530 A JP2003010530 A JP 2003010530A JP 2003010530 A JP2003010530 A JP 2003010530A JP 4225408 B2 JP4225408 B2 JP 4225408B2
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Prior art keywords
fibers
heat
nonwoven fabric
fiber
pulp
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JP2004263307A (en
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保二 安光
康行 山崎
彰志 西川
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金星製紙株式会社
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Priority to JP2003010530A priority Critical patent/JP4225408B2/en
Priority to KR1020057012188A priority patent/KR101049623B1/en
Priority to PCT/JP2004/000108 priority patent/WO2004067825A1/en
Priority to US10/542,400 priority patent/US20060194498A1/en
Priority to CNA2004800024922A priority patent/CN1738934A/en
Priority to TW93100700A priority patent/TW200417644A/en
Publication of JP2004263307A publication Critical patent/JP2004263307A/en
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    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/559—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving the fibres being within layered webs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/69—Autogenously bonded nonwoven fabric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/69—Autogenously bonded nonwoven fabric
    • Y10T442/692—Containing at least two chemically different strand or fiber materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/697—Containing at least two chemically different strand or fiber materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/697—Containing at least two chemically different strand or fiber materials
    • Y10T442/698—Containing polymeric and natural strand or fiber materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、濡れても強い乾式パルプ不織布に関するものである。さらに詳しくは、ウエット状で使用されるフロア用、キッチン用、自動車用などの対物ワイパーや、調理器具清掃、食材の拭き取り、ドリップ吸収用などのキッチンシートや、フェイス、ハンド、身体などの対人ワイパーなどに好適な不織布に関するものである。さらに、本発明は、ドライ状で使用される場合であっても、これらの用途においては水分が存在する場合が多いので、同様な効果が期待でき、また、生理用品、おむつなの衛生材料や、メディカルの用途においても同様に好適な不織布に関する。
【０００２】
【従来の技術】
従来から知られている乾式パルプ不織布は、パルプ繊維層をベースとしてポリアクリル酸エステル系やポリ酢酸ビニル系などのケミカルバインダー樹脂を表層にスプレーしたり塗布したり、全体に含浸したりして繊維間結合を形成している。
このような不織布においては、バインダー量を増やすと樹脂は膜を形成して硬くなったり、水分吸収能力の低下を招き、また、減らした場合はパルプ繊維の脱落が増大するばかりか、強力、特に湿潤時の強力の低下が避けられない。
【０００３】
また、粉末状のバインダー樹脂を付与する方法も考えられるが、この場合、皮膜はできにくいが、パルプ繊維とバインダーとの接着点の数が少なくなり、脱落繊維が多くなり易い。従って、硬すぎない風合い、適度な吸水性、少ない繊維脱落、実用に耐える強力などを確保しつつ、さらに湿潤強力に優れる乾式パルプ不織布を作ることは困難である。
【０００４】
乾式パルプ不織布であって、生理用品の吸収インサート材や家庭あるいは工業用の洗浄用途に使用されるものとして、表面の結合繊維のみからなる層の目付が１〜５ｇ／m2、内層部の結合繊維が２〜１０重量％である乾式パルプ不織布が提案されている（特許文献１参照。）。
【０００５】
この不織布の強度については、通常の強力に関しては生理用品の吸収インサート材のような衛生用品の用途としては十分とはいえ、本発明の大きなポイントである「濡れても強い」かに関しては一切言及されていない。この公開特許の範囲に入る技術内容の不織布は、内層部の結合繊維の量が２〜１０重量％と少なく、濡れても強いとは言い難く、湿潤時にはなはだしく強力低下を招くものであり、拭き取りには適さず、本発明の意図とは全く異なる。
【０００６】
【特許文献１】
特表２０００−５０４７９２号公報
【０００７】
また、バインダー繊維の交点を熱接着して形成されてなる、特定の引裂き強力を有するエアレイド不織布も提案されているが（特許文献２）、パルプと複合した場合における湿潤強力や、吸水性に関する言及は一切なく、本発明の層状構造としての技術を示唆する記載も一切ない。
【０００８】
【特許文献２】
特開２０００−３４５４５４号公報
【０００９】
【発明が解決しようとする課題】
本発明は、このような問題を克服するためになされたものであり、その目的とするところは、繊維の脱落がなく、吸水性がよく、かつ強い、特に湿潤強力が十分な乾式不織布を提供することにある。
【００１０】
【課題を解決するための手段】
本発明は、熱接着性合成繊維を含み、該合成繊維どうしが熱接着され目付が５ｇ／ｍ２を超えて１２ｇ／ｍ２以下である両面の表層部と、熱接着性合成繊維とパルプ繊維とが２０／８０〜６０／４０重量％の割合で混合されていて、該合成繊維どうしおよび／または該合成繊維とパルプ繊維とが熱接着されたものからなり、目付が４９〜２４０ｇ／ｍ２である内層部とからなり、全体として、表裏面と内層部の間も、該合成繊維どうしの熱接着により一体化されており、タテとヨコの強力の比率が、乾燥時および湿潤時共に、０．８〜１．２であり、乾燥時と湿潤時における強力の比率が、０．６〜１．１であり、水分の吸収性が８〜２０ｇ／ｇであり、かつ総目付が２０〜２５０ｇ／ｍ２であることを特徴とする、層状の構造が一体化された乾式パルプ不織布（以下、単に「乾式不織布」ともいう）に関する。
【００１１】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。
本発明の不織布は、熱接着性合成繊維とパルプ繊維からなる内層と、これを挟む熱接着性合成繊維を含む表層とで、３層構造となって、熱接着により一体化されている。
本発明において、表層を形成する主成分である、あるいは、パルプと混合される熱接着性合成繊維としては、熱で溶融し相互に結合するものであればどのようなものでもよく、この繊維間結合による網目状構造でパルプが固定されるが、パルプ繊維との親和性が大きいポリマーを使った繊維が特に好ましい。例えば、ポリオレフィン類、不飽和カルボン酸類でグラフト化されたポリオレフィン類や、ポリエステル類、ポリビニルアルコールなどが挙げられる。
【００１２】
このうち、ポリオレフィン系熱接着性合成繊維としては、芯鞘型や偏芯サイドバイサイド型の複合繊維が好適である。鞘あるいは繊維外周部を構成するポリオレフィンとしては、ポリエチレンやポリプロピレンが挙げられる。芯成分あるいは繊維内層部を構成するポリマーとしては、鞘より高融点であり、加熱接着処理温度で変化しないポリマーが好ましい。このような組み合わせとして、例えば、ポリエチレン／ポリプロピレン、ポリエチレン／ポリエステル、ポリプロピレン／ポリエステルなどが挙げられる。これらのポリマーは、本発明の作用・効果を阻害しない範囲で変性されていても差し支えがない。さらに、フィブリル状繊維であっても良い。例えば、三井化学株式会社のＳＷＰなどが挙げられる。
【００１３】
熱接着性合成繊維は、細いと構成繊維の本数が多くなるので、脱落繊維が少なくなり、風合いも柔らかくなる。太い場合は、繊維間の空隙が大きくなり、嵩高い不織布となるうえ、掻き取り効果も期待できる。したがって、繊維の太さは用途に応じて選択すればよいが、好ましい繊度は、０．５ｄｔ〜５０ｄｔであり、さらに、好ましくは、０．８ｄｔ〜３０ｄｔである。５０ｄｔを超えるとパルプの脱落が抑え切れず好ましくない。一方、０．５ｄｔ未満では不織布の生産性に欠けるので実用的でない。
【００１４】
また、熱接着性合成繊維の長さは、１〜１５ｍｍが好ましい。繊維が短いとパルプとの混合性がよくなり、より均一な不織布となりやすいが、１ｍｍ未満になると粉末状に近づき、繊維間結合による網目構造が作りにくくパルプの脱落を抑えきれなくなるばかりか、不織布としての強力が低くなり、実用性に欠けるので好ましくない。一方、１５ｍｍより長くなると不織布の強力は上がるが、不織布製造時の繊維の空気輸送において繊維どうしが絡まりやすくなり、繊維塊状欠点を増大させるので好ましくない。特に、好ましいのは、３〜１０ｍｍである。
【００１５】
表層には、上記の熱接着性合成繊維のほかに、レーヨンなどの再生繊維、アセテートなどの半合成繊維、ポリエステル、ポリプロピレン、ポリアミド、ビニロンなどの合成繊維や、パルプ、コットン、麻などの天然繊維などの他の繊維を含んでいてもよい。この場合、表層における熱接着性合成繊維の割合は７０〜１００重量％が好ましく、さらに好ましくは８５〜１００重量％である。７０重量％未満の場合は上記の他の繊維の脱落が生じる可能性が多くなるうえ、内層部のパルプの脱落を押さえる効果も少なくなるばかりか、湿潤強力も低くなり、実用上の問題を生じる。
表層を形成するこれらの繊維は熱接着されており、この繊維間結合による網目状構造でパルプが固定される。目付は５g／m2を超えて１２g／m2以下でなければならない。５g／m2以下では、耐水性を有する合成繊維の量、および繊維間の結合点数が少ないので、拭き取りに耐えうる十分な湿潤強度を確保できないばかりか、脱落繊維の増大を招きやすい。衛生材のような吸収性を重視する用途と異なり、拭き取りに用いる場合は、繊維が脱落しやすく、このような不織布はワイパーやキッチンシートなどの用途としては実用的でない。一方、１２g／m2を超えると、耐水性のある熱接着の層が厚くなりすぎ、内層への水分の吸収が不十分となるうえ、風合いも堅くなり、やはり実用性に欠ける。目付けが大きくなると強度は大きくなるが吸水性は低下する。しかしながら、本発明の範囲であれば、吸水性が十分でかつ湿潤時でも強度があり、繊維の脱落もなく、風合いも柔らかい不織布を得ることができる。
また、合成繊維の量が多いので、油の吸収もよく、油分とのなじみもよいので、汚れが落ちやすいという利点もある。
【００１６】
内層部は熱接着性合成繊維とパルプ繊維が熱接着により一体化されている。熱接着性合成繊維は、表層と同じものを用いても異なったものを用いてもよい。パルプ繊維としては、長さが０．２ｍｍ〜５ｍｍの粉砕パルプが好ましい。
内層部の熱接着性合成繊維とパルプ繊維の混合比率は、熱接着性合成繊維の比率が、接着性合成繊維とパルプ繊維の合計に対して２０重量％未満では、脱落繊維が増加し、強度、特に湿潤時の強度が低下する。このようなものは、衛生用品のような、強度はなくても吸水性や柔らかさを重視する用途には使用できても、本発明の目的である、ふき取り用の不織布としての使用に耐えない。一方、６０重量％を超えると、吸収性に寄与するパルプ繊維の量が低下し、水の拭き取り性や吸収性に欠けるばかりか、風合いも硬くなり実用性に欠ける。
【００１７】
熱接着性合成繊維の比率が大きくなると強度は大きくなるが吸水性は低下する。
そこで、十分な強度、特に湿潤時における強度と、吸水性の両立は難しかった。
ワイパー類やキッチンシート類の用途にとって、これらの両立は非常に重要である。本発明の比率の範囲においてはじめて、充分な吸水性を保ち、かつ、湿潤時でも十分な強度のある不織布が得られるのである。また、脱落繊維の量も少なく、このような不織布は、汚れても、洗って絞って乾かすことができるに充分な程の強度があり、数回繰り返し使用することができる。また、熱合成繊維の比率が大きいので、嵩が小さく、薄くすることができるので、ハンドリング性に優れ、省スペースにも役立つ。
【００１８】
内層部において、熱接着性合成繊維どうし、また、熱接着性合成繊維とパルプ繊維とは、熱接着されている。この内層の目付は４９〜２４０ｇ／ｍ２が好ましい。内層部の目付が小さいと内層部のパルプの量が少な過ぎて吸水性が不十分であり、一方、２４０ｇ／ｍ２を超えると全体が板状を呈して本用途には適さない。
また、不織布全体として表裏面と内層部の間も熱接着性合成繊維どうしの熱接着により一体化されている。さらに、十分なヒートシール性を有する。
【００１９】
このような不織布は、乾式不織布であれば、どのような方法で製造されていてもよいが、エアレイド法による不織布が好ましい。エアレイド法で製造された不織布は、不織布を形成している繊維が、不織布の長手方向、幅方向および厚み方向にランダムに３次元配向されているので好ましい。
【００２０】
ここで、エアレイド法による不織布は、以下のようにして得ることができる。
所定量の解繊された熱接着性合成繊維を主体とする繊維を空気流に均一分散させながら搬送し、吐出部に設けた細孔を有するスクリーンから吹き出した該繊維を、下部に設置された金属またはプラスチックのネットに落としネット下部で空気をサクションしながら、上記繊維をネット上に堆積させる。次に、熱接着性合成繊維とパルプ繊維の混合物を同様にして、上記堆積シートの上に堆積させる。さらに、熱接着性合成繊維を主体とする繊維をこのこれらシート上に堆積させる。
次に、この熱接着性合成繊維が充分その接着効果を発揮する温度に全体を加熱処理して、本発明の乾式パルプ不織布を得ることができる。接着効果を十分発揮させるには、熱接着性合成繊維の接着成分の融点より１５〜４０℃高い温度での加熱処理が必要である。
【００２１】
このように、エアレイド法で製造された不織布は、不織布の流れ方向、幅方向および厚み方向へ繊維をランダムに３次元配向させることが可能である。そして、これらが熱接着するので、層間剥離を起こすことがない。また、エアレイド法で製造した不織布は、均一性が良好なので、性能のバラツキも少なくなる。
必要であれば、さらにカレンダー処理やエンボス処理を施すこともできる。
【００２２】
本発明の不織布は、タテとヨコの強力の比率が、乾燥時および湿潤時ともに０．８〜１．２、好ましくは０．８５〜１．２でなければならない。どちらか一方の強度が低ければ実用上の支障を生じ易い。
また、乾燥時と湿潤時における強力の比率は、０．６〜１．１、好ましくは０．７〜１．１でなければならない。０．６未満のものは、乾燥時に比べて湿潤時の強力が大きく低下する、すなわち、濡れると弱くなる不織布であり、本発明の意図するところから外れ、実用上問題が生じる。また、湿潤時には水分の存在による繊維間の表面張力で強力が上昇し、１を超える場合があり、これも本発明の範囲であるが、なんらかの水分の存在で結合する別の手段が存在しない限り１．１を超えることは通常はない。
【００２３】
本発明の不織布が適用されるワイパー類、キッチンシート類、衛材類などには適度な水分吸収性が必要であり、水分の吸収性は、８〜２０ｇ／ｇ、好ましくは１０〜１８ｇ／ｇでなければならない。８ｇ／ｇ未満では、実用における拭き取り性、水分保持性に欠け、実用上問題がある。一方、２０ｇ／ｇを超えると不織布自身が保持する水分量が多すぎて、取り扱いハンドリング性に問題がある。
【００２４】
不織布全体の目付としては、２０〜２５０ｇ／ｍ2が好ましく、用途に応じて、適切な目付けを選択することができる。
【００２５】
本発明の不織布は本発明の意図を損なわない限り、他のシートと一体化してもよい。例えば、通気性シートと一体化するのであれば、本発明の不織布を作るにあたり、通気性シートを金網上に置いておき、この上に繊維を堆積させていくことで、容易に複合シート化することができる。
また、一体化するシートとしては、一般に知られている乾式不織布、湿式不織布、紙、スパンボンド、メルトブロー、プラスチックネット、穴あきフィルム、スプリットヤーンクロス、眼の粗い織編み物、寒冷紗などが挙げられるが、熱接着性材料で構成されているシートが好ましく、かつ通気性は大きい方が好ましい。
【００２６】
【実施例】
以下、本発明を実施例を挙げて説明するが、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、以下の実施例のうち「実施例１」は参考例である。
【００２７】
実施例１（参考例）
表裏層部の熱接着性繊維として、芯がポリエチレンテレフタレートで鞘がポリエチレンの芯鞘型複合繊維（帝人ファイバー株式会社製・Ｆ６。２．２ｄｔ、長さ５ｍｍ）を用い、内層部としては、芯がポリプロピレンで鞘が共重合ポリエチレンの複合繊維（チッソポリプロ繊維株式会社・インタック。１．７ｄｔ、長さ５ｍｍ）と、パルプ（Ｗｅｙｅｒｈａｅｕｓｅｒ社製・ＮＢ４１６Ｋｒａｆｔ）をそれぞれ３０重量％、７０重量％の割合で混合したものを用い、加熱温度を１４５℃としてエアレイド法で不織布を製造した。表裏層の目付は６ｇ／ｍ２、内層の目付は３３ｇ／ｍ２とした。厚さは０．５４ｍｍであった。
タテ、ヨコの強力、その比率、その乾燥時と湿潤時の比率、吸水性などの物性を表１に示す。
なお、本参考例および以下の実施例において、強力、吸水性は以下の方法により測定した。
（１）強力：ＪＩＳ Ｌ−１９１３による。ただし、試験片の幅は２５ｍｍ、つかみ間隔は１００ｍｍとした。
（２）吸水性：あらかじめ重さを測った１００ｍｍ×１００ｍｍの試験片を２０℃の水に１分間浸漬してから、４５度に傾けたガラス板の上に１分間置いて、その後再度重さを測り、次式により吸水性を算出する。
（ａ）面積あたり吸水性（ｇ／ｍ２）：吸水した水の重さを、試験片の面積で割り、ｇ／ｍ２として表示する。
（ｂ）自重あたりの吸水性（ｇ／ｇ）：吸水した水の重さを、試験片の重さで割り、ｇ／ｇとして表示する。
【００２８】
実施例２
表裏層部の接着性複合繊維とパルプの比率を９０／１０、目付を８ｇ／ｍ2、内層部の接着性複合繊維とパルプの比率を２５／７５、目付を４９ｇ／ｍ2とした他は全て実施例１と同様にしてエアレイド法で不織布を製造した。
厚さは０．６８ｍｍであった。
【００２９】
実施例３
表裏層部の目付を１０ｇ／ｍ2、内層部の接着性複合繊維とパルプの比率を４０／６０、目付を１００ｇ／ｍ2とした他は全て実施例１と同様にしてエアレイド法で不織布を製造した。
【００３０】
比較例１
表裏層部の目付を４ｇ／ｍ2、内層部の接着性複合繊維とパルプの比率を８／９２、目付を５２ｇ／ｍ2とした他は全て実施例１と同様にしてエアレイド法で不織布を製造した。
【００３１】
比較例２
表裏層部の目付を１６ｇ／ｍ2、内層部の接着性複合繊維とパルプの比率を７０／３０、目付を２３ｇ／ｍ2とした他は全て実施例１と同様にしてエアレイド法で不織布を製造した。
【００３２】
比較例3
目付が５８ｇ／ｍ2のパルプのみによるエアレイド不織布を作製し、ポリアクリル酸エステル樹脂のエマルジョンを、固形分で８ｇ／ｍ2となるよう含浸付与したあと、熱風温度１３０℃で乾燥し、樹脂タイプのエアレイド不織布とした。
上記の実施例と比較例で得られた不織布の物性を表１に示す。
【００３３】
【表１】

Figure 0004225408
【００３４】
【発明の効果】
本発明は、熱接着性合成繊維を含む表裏層の目付を適正化し、また、内層の熱接着性合成繊維の量を増やすことによって、繊維の脱落を抑え、吸水性を損なうことなく、不織布の強度を、湿潤時の使用や繰り返し使用に耐えられるほどに上げることが可能になった。また、水や油のふき取り性もよく、層間剥離もなく、ふき取りの用途に非常に適している不織布を得ることができた。また、本発明の不織布は十分なヒートシール性を有する。また、生理用品、おむつなどの衛生材料や、メディカルの用途においても同様に好適である。
また、本発明の不織布はケミカルバインダー樹脂による残留モノマーの心配がなく、衛生的である。
さらに、不織布の製造工程において排水が出ず、排気にもケミカルバインダーのモノマーがなく、環境負荷が小さい。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dry pulp nonwoven fabric that is strong even when wet. More specifically, objective wipers for floors, kitchens, cars, etc. used in wet form, kitchen sheets for cleaning utensils, wiping ingredients, drip absorption, etc., and interpersonal wipers such as face, hand, body, etc. It is related with the nonwoven fabric suitable for the above. Furthermore, even if the present invention is used in a dry state, there are many cases where moisture is present in these applications, so that the same effect can be expected, and sanitary products, sanitary materials for diapers, The present invention also relates to a non-woven fabric that is also suitable for medical use.
[0002]
[Prior art]
Conventionally known dry-type pulp nonwoven fabrics are made by spraying or coating the surface layer with a chemical binder resin such as polyacrylate ester or polyvinyl acetate based on the pulp fiber layer, or impregnating the entire fiber. A bond is formed.
In such a non-woven fabric, increasing the binder amount causes the resin to form a film and become harder, leading to a decrease in water absorption capacity. A decrease in strength when wet is inevitable.
[0003]
Although a method of applying a powdery binder resin is also conceivable, in this case, a film is difficult to form, but the number of adhesion points between the pulp fibers and the binder decreases, and the number of fallen fibers tends to increase. Therefore, it is difficult to make a dry pulp nonwoven fabric that is superior in wet strength while ensuring a texture that is not too hard, moderate water absorption, small fiber shedding, strength that can withstand practical use, and the like.
[0004]
A dry pulp nonwoven fabric that is used for sanitary hygiene absorbent inserts and household or industrial cleaning applications, and has a surface area of 1 to 5 g / m 2 consisting of only binding fibers on the surface. A dry pulp nonwoven fabric in which the fiber content is 2 to 10% by weight has been proposed (see Patent Document 1).
[0005]
Regarding the strength of this nonwoven fabric, although it is sufficient for the use of sanitary goods such as sanitary hygiene absorbent inserts with regard to normal strength, it is not mentioned at all whether it is “strong even when wet” which is a major point of the present invention. It has not been. The nonwoven fabric of the technical content that falls within the scope of this published patent has a small amount of 2 to 10% by weight of the binding fiber in the inner layer part, and it is difficult to say that it is strong even when wet. Is not suitable for the present invention and is completely different from the intention of the present invention.
[0006]
[Patent Document 1]
JP 2000-504792 A Publication [0007]
In addition, an airlaid nonwoven fabric having a specific tear strength formed by thermally bonding the intersections of binder fibers has also been proposed (Patent Document 2), but mentions about wet strength when combined with pulp and water absorption. There is no description suggesting the technology as the layered structure of the present invention.
[0008]
[Patent Document 2]
Japanese Patent Laid-Open No. 2000-345454
[Problems to be solved by the invention]
The present invention has been made in order to overcome such problems, and the object of the present invention is to provide a dry nonwoven fabric that does not drop off fibers, has good water absorption, and is particularly strong in wet strength. There is to do.
[0010]
[Means for Solving the Problems]
The present invention includes a heat-adhesive synthetic fiber, a surface layer portion on both sides in which the synthetic fibers are heat-bonded and have a basis weight of more than 5 g / m 2 and 12 g / m 2 or less, a heat-adhesive synthetic fiber and a pulp fiber DOO is being mixed in a ratio of 20/80 to 60/40% by weight, consists of those said synthetic fibers to each other and / or with the synthetic fibers and pulp fibers are thermally bonded, a basis weight of 49 ~240g / m 2 It is composed of the inner layer part, and as a whole, the front and back surfaces and the inner layer part are also integrated by thermal bonding of the synthetic fibers, and the ratio of the vertical and horizontal strength is both dry and wet. 0.8 to 1.2, the ratio of strength when dry and wet is 0.6 to 1.1, the moisture absorption is 8 to 20 g / g, and the total weight is 20 to 20 It characterized in that it is a 250 g / m 2, a layered structure is integrated The dry pulp non-woven fabric (hereinafter also referred to simply as "dry non-woven fabric") on.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
The nonwoven fabric of the present invention has a three-layer structure composed of an inner layer composed of heat-adhesive synthetic fibers and pulp fibers and a surface layer containing heat-adhesive synthetic fibers sandwiching the inner layers, and is integrated by heat bonding.
In the present invention, the heat-adhesive synthetic fiber that is the main component that forms the surface layer or is mixed with the pulp may be any fiber that melts with heat and bonds to each other. Although the pulp is fixed by a network structure by bonding, fibers using a polymer having a high affinity with pulp fibers are particularly preferable. Examples thereof include polyolefins, polyolefins grafted with unsaturated carboxylic acids, polyesters, polyvinyl alcohol, and the like.
[0012]
Among these, as the polyolefin-based heat-bonding synthetic fiber, a core-sheath type or an eccentric side-by-side type composite fiber is preferable. Examples of the polyolefin constituting the sheath or the outer periphery of the fiber include polyethylene and polypropylene. The polymer constituting the core component or the inner fiber layer is preferably a polymer having a melting point higher than that of the sheath and not changing at the heat bonding treatment temperature. Examples of such combinations include polyethylene / polypropylene, polyethylene / polyester, polypropylene / polyester, and the like. These polymers may be modified as long as they do not impair the action / effect of the present invention. Furthermore, it may be a fibrillar fiber. For example, SWP of Mitsui Chemicals, Inc. is mentioned.
[0013]
If the heat-bonding synthetic fiber is thin, the number of constituent fibers increases, so that the number of falling fibers decreases and the texture becomes soft. When it is thick, the gap between the fibers becomes large, resulting in a bulky nonwoven fabric and a scraping effect can be expected. Therefore, the thickness of the fiber may be selected according to the application, but the preferred fineness is 0.5 dt to 50 dt, and more preferably 0.8 dt to 30 dt. If it exceeds 50 dt, the drop of the pulp cannot be suppressed, which is not preferable. On the other hand, if it is less than 0.5 dt, the productivity of the nonwoven fabric is lacking, which is not practical.
[0014]
The length of the heat-bonding synthetic fiber is preferably 1 to 15 mm. If the fibers are short, the mixability with the pulp is improved, and a more uniform non-woven fabric tends to be obtained. This is not preferable because the strength of the resin becomes low and the utility is lacking. On the other hand, if the length is longer than 15 mm, the strength of the nonwoven fabric increases, but the fibers tend to get entangled during pneumatic transportation of the fibers during the production of the nonwoven fabric, which increases the fiber lump defects, which is not preferable. Particularly preferred is 3 to 10 mm.
[0015]
On the surface layer, in addition to the above heat-adhesive synthetic fibers, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, synthetic fibers such as polyester, polypropylene, polyamide and vinylon, and natural fibers such as pulp, cotton and hemp Other fibers may be included. In this case, the ratio of the heat-adhesive synthetic fiber in the surface layer is preferably 70 to 100% by weight, more preferably 85 to 100% by weight. When the amount is less than 70% by weight, the above-mentioned other fibers may drop off, and the effect of suppressing the pulp from dropping off from the inner layer may be reduced, and the wet strength may be lowered, causing a practical problem. .
These fibers forming the surface layer are thermally bonded to each other, and the pulp is fixed by a network structure formed by bonding between the fibers. The basis weight must be more than 5 g / m 2 and not more than 12 g / m 2 . When the amount is 5 g / m 2 or less, the amount of the synthetic fiber having water resistance and the number of bonding points between the fibers are small, so that not only a sufficient wet strength that can withstand wiping cannot be secured, but the falling fibers tend to increase. Unlike applications that place importance on absorbability such as sanitary materials, fibers are easy to fall off when used for wiping, and such nonwoven fabrics are not practical for applications such as wipers and kitchen sheets. On the other hand, if it exceeds 12 g / m 2 , the water-resistant heat-adhesive layer becomes too thick, the moisture absorption into the inner layer becomes insufficient, the texture becomes stiff, and practicality is also lacking. As the basis weight increases, the strength increases but the water absorption decreases. However, within the scope of the present invention, it is possible to obtain a non-woven fabric that has sufficient water absorption, has strength even when wet, does not lose fibers, and has a soft texture.
In addition, since the amount of synthetic fiber is large, the oil can be absorbed well and the oil can be used well.
[0016]
In the inner layer portion, the heat-bonding synthetic fiber and the pulp fiber are integrated by heat bonding. As the heat-adhesive synthetic fiber, the same one as the surface layer or a different one may be used. As the pulp fiber, a pulverized pulp having a length of 0.2 mm to 5 mm is preferable.
The mixing ratio of the heat-bonding synthetic fiber and the pulp fiber in the inner layer portion is such that when the ratio of the heat-bonding synthetic fiber is less than 20% by weight with respect to the total of the bondable synthetic fiber and the pulp fiber, the falling fibers increase and the strength In particular, the strength when wet is reduced. Even if it is not strong but can be used for applications that place importance on water absorption and softness, such as sanitary goods, it cannot withstand use as a non-woven fabric for wiping, which is the object of the present invention. . On the other hand, if it exceeds 60% by weight, the amount of pulp fiber contributing to the absorption is reduced, and not only the water wiping property and the absorption property are lacking, but also the texture becomes hard and lacks practicality.
[0017]
As the ratio of the heat-adhesive synthetic fiber increases, the strength increases but the water absorption decreases.
Accordingly, it has been difficult to achieve both sufficient strength, particularly when wet, and water absorption.
These compatibility is very important for the use of wipers and kitchen sheets. For the first time within the range of the ratio of the present invention, it is possible to obtain a non-woven fabric having sufficient water absorption and sufficient strength even when wet. In addition, the amount of fallen fibers is small, and such a nonwoven fabric is strong enough to be washed, squeezed and dried even if it becomes dirty, and can be used repeatedly several times. In addition, since the ratio of the heat-synthetic fiber is large, the bulk is small and the thickness can be reduced.
[0018]
In the inner layer portion , the heat-adhesive synthetic fibers and the heat-adhesive synthetic fibers and the pulp fibers are thermally bonded. The basis weight of this inner layer is preferably 49 to 240 g / m 2 . If the basis weight of the inner layer portion is small, the amount of pulp in the inner layer portion is too small and water absorption is insufficient. On the other hand, if it exceeds 240 g / m 2 , the whole exhibits a plate shape and is not suitable for this application.
Further, the entire nonwoven fabric is also integrated between the front and back surfaces and the inner layer portion by heat bonding between the heat-bonding synthetic fibers. Furthermore, it has sufficient heat sealability.
[0019]
Such a non-woven fabric may be produced by any method as long as it is a dry non-woven fabric, but a non-woven fabric by an airlaid method is preferred. The nonwoven fabric produced by the airlaid method is preferred because the fibers forming the nonwoven fabric are randomly three-dimensionally oriented in the longitudinal direction, width direction and thickness direction of the nonwoven fabric.
[0020]
Here, the nonwoven fabric by the airlaid method can be obtained as follows.
A fiber mainly composed of a predetermined amount of heat-bonded synthetic fiber that has been defibrated is conveyed while being uniformly dispersed in an air stream, and the fiber blown out from a screen having pores provided in a discharge part is installed at the lower part. The fiber is deposited on a net while dropping into a metal or plastic net and suctioning air at the bottom of the net. Next, a mixture of heat-adhesive synthetic fibers and pulp fibers is similarly deposited on the deposition sheet. Further, fibers mainly composed of heat-adhesive synthetic fibers are deposited on these sheets.
Next, the whole is heat-treated at a temperature at which this heat-adhesive synthetic fiber sufficiently exhibits its adhesion effect, and the dry pulp nonwoven fabric of the present invention can be obtained. In order to fully exhibit the adhesive effect, heat treatment is required at a temperature 15 to 40 ° C. higher than the melting point of the adhesive component of the thermoadhesive synthetic fiber.
[0021]
Thus, the nonwoven fabric manufactured by the airlaid method can three-dimensionally orient the fibers at random in the flow direction, width direction and thickness direction of the nonwoven fabric. And since these are thermally bonded, delamination does not occur. Moreover, since the non-woven fabric produced by the airlaid method has good uniformity, there is less variation in performance.
If necessary, further calendar processing and embossing processing can be performed.
[0022]
In the nonwoven fabric of the present invention, the ratio of warp and width strength should be 0.8 to 1.2, preferably 0.85 to 1.2 when dry and wet. If either one of the strengths is low, practical problems are likely to occur.
Further, the ratio of strength when dry and wet must be 0.6 to 1.1, preferably 0.7 to 1.1. Those less than 0.6 are non-woven fabrics whose strength when wet is greatly reduced compared to when dry, that is, weakened when wet, and deviates from the intention of the present invention, causing problems in practical use. Further, when wet, the strength increases due to the surface tension between fibers due to the presence of moisture and may exceed 1, which is also within the scope of the present invention, but unless there is another means of binding in the presence of any moisture. It is not normal to exceed 1.1.
[0023]
The wipers, kitchen sheets, sanitary materials, etc. to which the nonwoven fabric of the present invention is applied must have an appropriate water absorbency, and the water absorbency is 8-20 g / g, preferably 10-18 g / g. Must. If it is less than 8 g / g, there is a problem in practical use due to lack of wiping property and moisture retention in practical use. On the other hand, when it exceeds 20 g / g, the nonwoven fabric itself has too much water content, and there is a problem in handling properties.
[0024]
The basis weight of the entire nonwoven fabric is preferably 20 to 250 g / m 2 , and an appropriate basis weight can be selected depending on the application.
[0025]
The nonwoven fabric of the present invention may be integrated with other sheets as long as the intention of the present invention is not impaired. For example, if it is integrated with a breathable sheet, when making the nonwoven fabric of the present invention, the breathable sheet is placed on a wire mesh, and fibers are deposited on this to easily form a composite sheet. be able to.
Examples of the sheet to be integrated include generally known dry nonwoven fabrics, wet nonwoven fabrics, paper, spunbond, melt blow, plastic nets, perforated films, split yarn cloths, woven knitted fabrics with rough eyes, and cold chills. A sheet made of a heat-adhesive material is preferable, and a larger air permeability is preferable.
[0026]
【Example】
EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited to these Examples. Of the following examples, “Example 1” is a reference example.
[0027]
Example 1 (Reference Example)
A core-sheath type composite fiber (F6, 2.2 dt, length 5 mm, manufactured by Teijin Fibers Ltd.) whose core is polyethylene terephthalate and whose sheath is polyethylene is used as the heat-adhesive fiber for the front and back layer parts, Is 30% by weight and 70% by weight of composite fiber (Chissopolypro Fiber Co., Ltd., Intac. 1.7 dt, length 5 mm) and pulp (NB416 Kraft, manufactured by Weyerhaeuser), respectively. A non-woven fabric was produced by the airlaid method using the mixture and heating temperature of 145 ° C. The basis weight of the front and back layers was 6 g / m 2 , and the basis weight of the inner layer was 33 g / m 2 . The thickness was 0.54 mm.
Table 1 shows the vertical and horizontal strength, the ratio thereof, the ratio between dry and wet conditions, water absorption, and the like.
In this reference example and the following examples, the strength and water absorption were measured by the following methods.
(1) Powerful: According to JIS L-1913. However, the width of the test piece was 25 mm, and the holding interval was 100 mm.
(2) Water absorption: A 100 mm × 100 mm test piece weighed in advance is immersed in water at 20 ° C. for 1 minute, then placed on a glass plate inclined at 45 degrees for 1 minute, and then weighed again. Measure the water absorption by the following formula.
(A) Water absorption per area (g / m 2 ): The weight of the absorbed water is divided by the area of the test piece and displayed as g / m 2 .
(B) Water absorption per weight (g / g): The weight of the absorbed water is divided by the weight of the test piece and displayed as g / g.
[0028]
Example 2
The ratio of the adhesive composite fiber and pulp in the front and back layer portions is 90/10, the basis weight is 8 g / m 2 , the ratio of the adhesive composite fiber and pulp in the inner layer portion is 25/75, and the basis weight is 49 g / m 2 All the nonwoven fabrics were manufactured by the airlaid method in the same manner as in Example 1.
The thickness was 0.68 mm.
[0029]
Example 3
The nonwoven fabric was formed by the airlaid method in the same manner as in Example 1 except that the basis weight of the front and back layer portions was 10 g / m 2 , the ratio of the adhesive composite fiber to the pulp of the inner layer portion was 40/60, and the basis weight was 100 g / m 2. Manufactured.
[0030]
Comparative Example 1
The nonwoven fabric was formed by the airlaid method in the same manner as in Example 1 except that the basis weight of the front and back layer portions was 4 g / m 2 , the ratio of the adhesive conjugate fiber to the pulp of the inner layer portion was 8/92, and the basis weight was 52 g / m 2. Manufactured.
[0031]
Comparative Example 2
The nonwoven fabric was formed by the airlaid method in the same manner as in Example 1 except that the basis weight of the front and back layer portions was 16 g / m 2 , the ratio of the adhesive composite fiber to the pulp of the inner layer portion was 70/30, and the basis weight was 23 g / m 2. Manufactured.
[0032]
Comparative Example 3
An air laid nonwoven fabric made only of pulp having a basis weight of 58 g / m 2 was prepared, and an emulsion of a polyacrylate resin was impregnated so as to have a solid content of 8 g / m 2 , followed by drying at a hot air temperature of 130 ° C. Airlaid nonwoven fabric.
Table 1 shows the physical properties of the nonwoven fabrics obtained in the above Examples and Comparative Examples.
[0033]
[Table 1]
Figure 0004225408
[0034]
【The invention's effect】
The present invention optimizes the basis weight of the front and back layers containing the heat-adhesive synthetic fiber, and also increases the amount of the heat-adhesive synthetic fiber in the inner layer, thereby suppressing fiber dropout and without impairing water absorption. It has become possible to increase the strength to withstand use when wet and repeated use. Moreover, the wipeability of water and oil was good, there was no delamination, and the nonwoven fabric very suitable for the use of wiping could be obtained. Moreover, the nonwoven fabric of this invention has sufficient heat-sealability. Further, it is also suitable for sanitary materials such as sanitary products and diapers, and medical applications.
In addition, the nonwoven fabric of the present invention is hygienic without worrying about residual monomers due to the chemical binder resin.
Furthermore, there is no drainage in the manufacturing process of the nonwoven fabric, there is no chemical binder monomer in the exhaust, and the environmental impact is small.

Claims (1)

熱接着性合成繊維を含み、該合成繊維どうしが熱接着され目付が５ｇ／ｍ２を超えて１２ｇ／ｍ２以下である両面の表層部と、熱接着性合成繊維とパルプ繊維とが２０／８０〜６０／４０重量％の割合で混合されていて、該合成繊維どうしおよび／または該合成繊維とパルプ繊維とが熱接着されたものからなり、目付が４９〜２４０ｇ／ｍ２である内層部とからなり、全体として、表裏面と内層部の間も、該合成繊維どうしの熱接着により一体化されており、タテとヨコの強力の比率が、乾燥時および湿潤時共に、０．８〜１．２であり、乾燥時と湿潤時における強力の比率が、０．６〜１．１であり、水分の吸収性が８〜２０ｇ／ｇであり、かつ総目付が２０〜２５０ｇ／ｍ２であることを特徴とする、層状の構造が一体化された乾式パルプ不織布。A heat-adhesive synthetic fiber, wherein the synthetic fibers are heat-bonded and have a surface area on both sides of more than 5 g / m 2 and 12 g / m 2 or less; Inner layer part which is mixed at a ratio of 80 to 60/40% by weight and is composed of heat-bonded synthetic fibers and / or synthetic fibers and pulp fibers, and has a basis weight of 49 to 240 g / m 2 As a whole, the front and back surfaces and the inner layer part are also integrated by heat bonding between the synthetic fibers, and the ratio of the vertical and horizontal strength is 0.8 to 1.2, the ratio of strength between dry and wet is 0.6 to 1.1, the water absorption is 8 to 20 g / g, and the total weight is 20 to 250 g / m 2. A dry type with an integrated layered structure, characterized by Help non-woven fabric.
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