JP4122182B2 - Non-woven fabric for disposable warmers and disposable warmers with excellent printability - Google Patents
Non-woven fabric for disposable warmers and disposable warmers with excellent printability Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は印刷性に優れたカイロ包材用不織布および使い捨てカイロに関し、さらに詳しくは柔軟で印刷性に優れたカイロ包材用不織布およびこれを用いた使い捨てカイロに関するものである。
【０００２】
【従来の技術】
使い捨てカイロは、空気中で発熱する発熱体組成物を、不織布または紙にポリエチレン等のフィルムをラミネートした包材に包んだものであり、使用時に該発熱体組成物を空気中の酸素と反応させて熱を発生させ、人体に接触させて使用される。上記フィルムには有孔フィルムや微孔フィルムが用いられるが、無効フィルムを不織布にラミネートし、その後、孔あけ加工を施して通気性を持たせる場合もある。
近年、使い捨てカイロが広範囲に広く使用されており、カイロの不織布表面に、ブランド名や、暖かさをアピールする模様、かわいいキャラクターの絵模様等が印刷されるようになっている。この場合の印刷インキには、高堅牢性のインキが用いられているが、不織布表面の繊維層の凹凸、繊維の円形断面の影響によって印刷性が劣り、鮮明な印字や輪郭が得られず、また印刷面の濃度が低くなり、濃色インキを用いた場合でも鮮明さに欠けてぼやけてしまうという問題があった。
【０００３】
【発明が解決しようとする課題】
本発明の課題は、上記問題を解決し、柔軟な繊維触感を維持しながら、鮮明な印刷画像を得ることができる、印刷性に優れたカイロ包材用不織布およびこれを用いた使い捨てカイロを提供することにある。
【０００４】
【課題を解決するための手段】
本発明者らは、上記課題を解決するため、種々検討した結果、繊維触感および適性な強度を持ちながら、印刷性に優れたカイロ包材用不織布を得るためには、通常用いられるている丸断面糸の代わりに異形断面糸で構成された表面が平滑な不織布を用いることにより、上記課題を解決できることを見出し、本発明に到達したものである。
上記課題を達成するために本願で特許請求される発明は以下の通りである。
【０００５】
（１）表面に印刷が施されるカイロ包材用不織布を少なくとも一面に用いた使い捨てカイロであって、該不織布が、疎水性合成繊維からなる連続フィラメントであり、異形断面形状の繊維を含み、該異形断面形状の繊維が楕円形状であり、その断面扁平度が１．３以上であり、かつ少なくとも一面の不織布の縦方向と横方向の平均表面粗さ（Ｒａ）が１２μｍ以下であり、該不織布の横方向の曲げ柔軟性が５０〜１２１ｍｍであり、印刷線の途切れ数が２個／６ｍｍ以下であり、熱圧着面積率が５〜３５％であることを特徴とする使い捨てカイロ。
【０００６】
【発明の実施の形態】
本発明のカイロ包材用不織布には疎水性合成繊維が用いられる。
疎水性合成繊維としては、ポロプロピレン、ポリエチレン等のポリオレフィン系繊維、ポリエチレンテレフタレート、ポリプロピレンテレフタレート、ポリブチレンテレフタレート等のポリエステル系繊維、ナイロン６、ナイロン６６等のポリアミド系繊維などが挙げられ、これらは必要とされる疎水性、強度および可撓性等に応じ、単独でまたは組み合わせて用いられる。また必要に応じてこれらの複合繊維、さらにはセルロース系繊維、その他の特殊機能を持つ繊維を混合して用いてもよい。例えば、柔軟性および素材の熱伝導性の点からはポリアミド系繊維を用いるのが好ましく、寸法安定性、剛性および耐熱性の点からはポリエステル系繊維を用いるのが好ましく、さらに疎水性および柔軟性の点からはポリオレフィン系繊維を用いるのが好ましい。疎水性合成繊維は短繊維であっても長繊維であってもよいが、不織布の強度や柔軟性の点から長繊維が好ましい。また繊維の繊度も同様の理由から０．８〜５．５ｄｔｅｘの範囲が好ましい。
【０００７】
また本発明のカイロ包材用不織布は、異形断面形状の繊維を含む。
ここで、異形断面形状とは、繊維の長さ方向に対して直角方向に切断した時の繊維の断面形状をいい、異形断面形状の繊維とは、繊維の断面が実質的に異形の形状を有する繊維をいう。このような異形断面形状の繊維で不織布を構成することにより、丸断面形状の繊維で構成した同目付の不織布に比べ、不織布表面の繊維層の凹凸が少なくなり、表面の平滑性が向上するため、鮮明な印刷画像が得られ、印刷性が向上する。
異形断面形状の繊維は、楕円形の断面を有する繊維であり、該繊維の断面の扁平度は１．３以上、好ましくは２以上、より好ましくは２．５〜５．０の繊維が好ましい。ここで扁平度とは、繊維断面の短軸長ａと長軸長ｂを測定し、長軸長ｂを短軸長ａで除した値をいう。
【０００８】
異形断面形状の繊維は、例えば、扁平断面のノズルから溶融樹脂を押出して製造することができるが、丸断面繊維を製造した後にこれを潰して異形断面の繊維としてもよい。この場合の丸断面繊維の潰しは、繊維状で行っても、不織布とした後に行ってもよい。また不織布には本発明の目的を損なわない範囲で丸断面形状の繊維を含んでいてもよい。
このような異形断面形状の繊維で不織布を構成することにより、不織布の強度を維持しつつ厚みを薄くすることができ、かつ不織布の表面がより平滑となるため、不織布の柔軟な繊維感触を維持しつつ、不織布の印刷性を向上させることができる。
【０００９】
本発明のカイロ包材用不織布は、抄紙法、カード機などにより、またはスパンボンド法により製造されるが、強度の点からはスパンボンド法による長繊維不織布が好ましい。カード機等による短繊維不織布でも布的な触感を持たせることができるが、スパンボンド法による長繊維不織布は、繊維長が長いために実用上の強度が得られ、かつ湿式法または乾式法による場合と異なり、油剤処理等を行うことなく、繊維がそのままシート化されているので繊維特有の触感をより活かすことができる。
長繊維不織布は、例えば、スパンボンド法により溶融紡糸された連続フィラメントをウェブとし、これを接合することにより製造される。ウェブは、接着剤、低融点繊維や複合繊維による接合、溶融バインダーでの接合、繊維の触感を残すことができるニードルパンチや水流交絡法等で接合することができるが、繊維の触感や強度維持の点からは部分熱圧着法による接合が好ましい。
【００１０】
部分熱圧着における熱圧着面積率は、強度保持の点から５〜３５％が好ましい。部分熱圧着は、超音波法または加熱エンボスロール間にウェブを通して行うことができ、これにより、不織布の表面にピンポイント状、矩形状等の浮沈模様を散点させることができる。不織布の目付は、使用目的に応じて適宜選定されるが、実用強度、触感の点からは２５〜６０ｇ／ｍ2 が好ましい。
【００１１】
さらに本発明のカイロ包材用不織布は、その少なくとも一面の縦方向と横方向の平均表面粗さ（Ｒａ）が１２μｍ以下であることが必要である。不織布の縦と横方向の平均表面粗さが１２μｍを超えると鮮明な画像が得られず、印刷面の濃度が薄くなる。不織布の表面の平滑性が高いほど印刷性は向上するが、不織布の縦方向の表面の粗さＲａは１０μ以下が好ましく、より好ましくは９μ以下である。また不織布の横方向の表面粗さＲａは１１μ以下がより好ましい。なお、不織布の縦方向とは機械の巻取りの方向をいい、横方向とは機械の幅方向をいう。
【００１２】
本発明の使い捨てカイロは、上記した異形断面形状の疎水性合成繊維を含む不織布とフィルムとを貼り合わせて得たカイロ包材を重ね合わせ、その間に発熱体組成物を入れた後、重ね合わせ部の周囲を熱シールや接着剤等によりシールすることにより得られる。本発明のカイロ包材用不織布はカイロの両面に用いてもよいが、一方の面にのみ用いてもよい。
【００１３】
不織布に貼り合わせるフィルムとしては、ＬＤＰＥ（低密度ポリエチレン）、ＬＬＤＰＥ（直鎖状低密度ポリエチレン）、ＨＤＰＥ（高密度ポリエチレン）またメタロセン系触媒ＰＥ等の各種ポリエチレン、ポリプロピレン等のポリオレフィン系、ＥＶＡおよびエチレン、プロピレン、ブテン等の各種共重合ポリプロピレン等のポリオレフィン共重合系、ポリアミド系、ポリエステル系などのフィルムが用いられ、透湿性を有した微多孔フィルムであってもよい。柔軟性、シール性、価格の点から、ポリエチレンまたはその共重合系オレフィンフィルムが好ましい。また繊維層との相性、カイロのシール性の点から２〜３層のフィルムを組み合わせたものでもよい。
不織布とフィルムとの貼り合わせは、ヒートシール、熱接合またはホットメルト剤等の接着剤を用いる方法で行うことができ、全面接合でも、部分接合でもよい。部分接合の場合には不織布の柔軟性を保持するのが容易となる。使い捨てカイロとして必要な通気孔は、ラミネートした後の孔あけ加工により設けることができるが、有孔または微孔のフィルムを用いてもよい。
【００１４】
不織布表面への印刷は、グラビア印刷、フレキシ印刷、スクリーン印刷、転写印刷などの公知の方法で行うことができる。また印刷性向上のための放電加工などの前処理を施した後、これらの印刷を施してもよい。印刷に用いるインキには特に限定されないが、カイロ包材用不織布が外面として使用されるため、乾湿時の擦れなどによるインキの色落ちを防止するために、不織布素材と相性の良い印刷インキを選定することが好ましい。
不織布面における印刷の鮮明性は、後述する印刷線の途切れ数／６ｍｍで評価することができる。途切れ数は２個／６ｍｍ以下が好ましく、さらに好ましくは０個／６ｍｍ（途切れ無し）である。途切れ数が２個／６ｍｍ以下であれば印刷面が鮮明となる。
【００１５】
本発明のカイロ包材用不織布は、異形断面形状の繊維で構成されているため、表面平滑性に優れ、印刷性が向上する。またウェブ製造時には繊維はその断面の長辺を平面方向に向けて配列しやすくなるため、丸断面繊維を用いた同目付の不織布に比べて厚みが薄くなり、また平面方向に曲げ易くなり、柔軟性が感じ易く、心地よい伝熱媒体となる。さらに表面の平滑性に優れた不織布を用いているため、肌触りや柔軟性に優れるとともに、フィルムとのラミネート強度が向上する。
【００１６】
【実施例】
以下、本発明を実施例により具体的に説明する。なお、例中の特性は下記のようにして測定または評価した。
１）不織布の厚み：ピーコック厚み測定器を用い、１００ｇ／ｃｍ2 荷重で測定した。
２）不織布の強力および５％伸長時応力：ＪＩＳ Ｌ−１９０６に準じて測定した。
３）不織布繊維の扁平度：繊維断面の短軸長ａと長軸長ｂを測定し、長軸長ｂを短軸長ａで除した値を扁平度とした。なお、丸断面繊維を潰したものでは扁平度は一定ではないが、不織布表面の変形した繊維を扁平糸に類似したものとしてその断面について測定する。
４）不織布の曲げ柔軟度：柔軟性を示す指標として、次の方法で測定した。
試料片（幅５ｃｍ×測定方向長さ４ｃｍ）の測定方向の一方の端部１ｃｍを残して、試料片に直角方向で全幅に渡りスケールで押え、試料片の他端部を折り目をつけず、ループを形成させた状態で、スケールで押えた端部上にのせる。スケールで押えた側の端部を手で押えたまま、試料片の上をスケールを滑らせながらループ内に移動させる。試料の反発力でループが伸びた点を終点とし、この点からループ側端部までの長さを臨界長（ｍｍ）とし、表裏の平均値で表す。短いものほど柔軟であることを示す。
【００１７】
５）不織布の平滑性：表面粗さ形状測定機（東京精密社製サーフコム１１０Ａ）を用いて、不織布の縦方向と横方向の表面の平均粗さＲａ（μｍ）を測定し、その測定値を不織布の平滑性とした。数値が小さい程、平滑であることを示す。
６）不織布への印刷：ＰＯフィルム用表刷汎用インキ（東洋インキ製造社製、ＰＡＮＮカラーＳ３９藍配合、２０％顔料濃度）を用いて、小型輪転機により、ライン速度３０ｍ／ｍｉｎでグラビア（１５０メッシュ、版深３０μｍ）転写印刷を施した。
７）不織布の印刷面の濃度
色彩色差計（ＭＩＮＯＬＴＡ製：測定ヘッドＣＲ−１００）を用いて、不織布の印刷面を色彩を測定し、その測定値のＬ値、ａ値、ｂ値を印刷濃度とした。特にＬ値が小さい程、白さが少なく、青色ではｂ値が小さい程、青さが多く、不織布の印刷面の濃度が濃いことを示す。
８）不織布の印刷面の鮮明性：不織布表面に太さ０．４ｍｍの直線模様を印刷し、その印刷線の長さ６ｍｍ区間内で印刷が途切れる数を測定した。その数値を不織布の印刷面の鮮明性とした。数値が少ない程、印刷の途切れがなく印刷面は鮮明であることを示す。
【００１８】
実施例１
ナイロン６（相対粘度２．７）を原料とし、扁平断面のノズルから溶融押出した長繊維を紡口の近傍にて側方から冷却しながら、エアーサッカー型牽引装置で引き取った。牽引引取装置を出た糸条は、帯電装置を通過させて開繊させた後、移動する金網コンベアー上にウェブとして捕集した。このウェブを加熱したエンボスロールとフラットロールの間に通し、部分熱圧着して一辺０．５ｍｍ変形四辺形の織目柄（圧着面積率１４．５％）の散点模様を有する不織布を得た。
得られた不織布の構成繊維は２．０ｄｔｅｘ、扁平度２．５の扁平断面糸であり、目付４０ｇ／ｍ2 であった。この不織布の特性を表１に示す。
【００１９】
得られた不織布表面（反ラミネート面）にロゴ模様柄をグラビア印刷を施した後、不織布の反エンボス面に５０μのポリエチレン（ＬＬＤＰＥ）フィルムをラミネートした後、公知の方法により針ロールで窄孔（約６％）し、カイロ用包材とした。得られたカイロ用包材を上被層とし、下被層には無孔フィルムをラミネートした不織布を用い、フィルム面を内側に重ね合わせ、その中に発熱組成物を充填し、周囲をヒートシールして使い捨てカイロを得た。
得られた使い捨てカイロは、丸断面繊維を用いた従来のカイロに比べ、外側の不織布には鮮明な画像が印刷され、滑らかな触感、柔軟性を持ち、適度な肌触りを備えたものであった。
【００２０】
実施例２
実施例１において、不織布を構成するナイロン６の扁平度を３．０とした以外は実施例１と同様にしてカイロ用包材を作製し、これに印刷を行って使い捨てカイロを製作した。得られた不織布の性能を表１に示したが、実施例１と同様に鮮明な画像が印刷された柔軟性に優れたカイロであった。
【００２１】
実施例３
実施例１において、扁平断面ナイロン６に代わりに通常の丸断面ナイロン６繊維を用い、実施例１と同様にして、２．０ｄｔｅｘ、織目柄（圧着面積率１４．５％）、目付４０ｇ／ｍ2 の不織布を得た。この不織布を表面温度１５０℃の平滑金属ロールとペーパーロールを組み合わせたカレンダー装置に通し、表面の繊維層を平滑化した。表面の繊維を顕微鏡で観察した結果、扁平度１．６に相当する変形した繊維であった。この不織布は異形断面糸を用いた不織布と同じように薄くなり、表面の滑らかな触感を持ち、ソフトなものであった。この不織布の性能を表１に示す。
この平滑化した不織布を用いて、実施例１と同様にして、表面に印刷を施した後、厚さ４０μの透湿性を有する微孔ポリエチレンフィルムと積層し、使い捨てカイロを製作した。得られた使い捨てカイロは扁平断面繊維を用いたカイロと同様、鮮明な模様が印刷された、柔軟性に優れたカイロであった。
【００２２】
実施例４
実施例１において、ナイロン６の代わりにポリエチレンテレフタレート繊維（２．０ｄｔｅｘ、扁平度３．２）を用いた部分熱圧着スパンボンド（熱圧着面積率１４．５％織目柄、目付４０ｇ／ｍ2 ）を得た。
この不織布を用いて、実施例１と同様にして、表面に印刷を施した使い捨てカイロを製作した。このカイロは印刷が鮮明で、ナイロン６繊維に比べ、張りがあり、寸法安定性に優れたものであった。
【００２３】
実施例５
実施例４で得た不織布を、表面温度２２０℃の平滑金属ロール同士を組み合わせたカレンダー装置を通し、表面の繊維層を一段と薄化、平滑化した。この不織布の性能を表１に示す。
この平滑化した不織布を用いて、実施例４と同様にして、表面に印刷を施し、使い捨てカイロを製作した。得られた使い捨てカイロは表面が滑らかで、一段と模様の鮮明なカイロであった。また幾分剛性があり、靴底等の使用に適するものであった。
【００２４】
実施例６
実施例１において、ポリプロピレン（ＪＩＳＫ―７２１０の表１の条件で測定したＭＦＲ＝４０）を原料とした以外、同様にして不織布を得た。得られた不織布の構成繊維は２．５ｄｔｅｘ、扁平度３．５、部分熱圧着面積率７％ピンポイント柄、目付４０ｇ／ｍ2 であった。実施例１と同様にして、表面に印刷を施し、ラミネートするフィルムをＬＤＰＥとメタロセン触媒系ポリエチレン（シール面）とを半々積層した４０μフィルムとして、実施例１と同様に使い捨てカイロを製作した。不織布の性能を表１に示すが、実施例１と同様に印刷性に優れたものであった。
【００２５】
比較例１〜３
実施例１において、丸断面のナイロン６繊維（２．０ｄｔｅｘ）、ポリエチレンテレフタレート繊維（２．０ｄｔｅｘ）およびポリプロピレン繊維（２．８ｄｔｅｘ）をそれぞれ用いて不織布を製作し、性能比較を行った。
不織布の性能を表１に示したが、いずれの不織布も、実施例のものに比べて印刷画像の鮮明性に劣るものであった。
【００２６】
【表１】
【発明の効果】
本発明の印刷性に優れたカイロ包材用不織布は、異形断面形状を有する疎水性合成繊維で構成されるため、不織布の厚さを薄くでき、柔軟で肌触りに優れ、またその表面が平滑となるため、印刷性に優れ、鮮明で印刷濃度の高い画像が得られ、外観品位に優れた使い捨てカイロを得ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-woven body for a warmer wrapping material excellent in printability and a disposable warmer, and more particularly to a non-woven fabric for a warmer wrapping material excellent in flexibility and printability and a disposable warmer using the same.
[0002]
[Prior art]
The disposable body warmer is a heating element composition that generates heat in the air wrapped in a non-woven fabric or a paper sheet laminated with a film such as polyethylene, and the heating element composition reacts with oxygen in the air during use. It generates heat and is used in contact with the human body. For the film, a perforated film or a microporous film is used. In some cases, an ineffective film is laminated on a non-woven fabric, and then a perforating process is performed to impart air permeability.
In recent years, disposable warmers have been widely used, and brand names, patterns that appeal to warmth, and cute character patterns have been printed on the nonwoven fabric surfaces of warmers. In this case, a highly robust ink is used for the printing ink, but the printability is inferior due to the unevenness of the fiber layer on the surface of the nonwoven fabric and the circular cross section of the fiber, and a clear print and contour cannot be obtained. In addition, there is a problem that the density of the printed surface is low, and even when dark ink is used, it is not clear and blurs.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a non-woven fabric for warmer packaging materials excellent in printability and a disposable warmer using the same, which can solve the above-mentioned problems and can obtain a clear printed image while maintaining a soft fiber feel. There is to do.
[0004]
[Means for Solving the Problems]
As a result of various studies to solve the above-mentioned problems, the present inventors have found that a round shape that is usually used is used to obtain a nonwoven fabric for a warmer packaging material that has excellent fiber printability and good strength. The present inventors have found that the above problem can be solved by using a non-woven fabric having a smooth surface composed of modified cross-section yarns instead of cross-section yarns, and has reached the present invention.
The invention claimed in the present application in order to achieve the above object is as follows.
[0005]
(1) A disposable warmer using at least one surface of a nonwoven fabric for warmer wrapping material on which printing is applied, the nonwoven fabric being continuous filaments made of hydrophobic synthetic fibers, including fibers having irregular cross-sectional shapes, fibers of said different cross-sectional shape is an elliptical shape, the cross-sectional flatness is not less than 1.3, and an average surface roughness in the longitudinal direction and the lateral direction of at least one surface of the nonwoven fabric (Ra) is not more 12μm or less, said A disposable body warmer characterized in that the transverse bending flexibility of the nonwoven fabric is 50 to 121 mm, the number of breaks in the printed lines is 2/6 mm or less, and the thermocompression area ratio is 5 to 35% .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
A hydrophobic synthetic fiber is used for the nonwoven fabric for warmer wrapping material of the present invention.
Examples of hydrophobic synthetic fibers include polyolefin fibers such as polypropylene and polyethylene, polyester fibers such as polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate, and polyamide fibers such as nylon 6 and nylon 66, which are necessary. Depending on the hydrophobicity, strength, flexibility, and the like, used alone or in combination. If necessary, these composite fibers, further cellulosic fibers, and other fibers having special functions may be mixed and used. For example, it is preferable to use polyamide fiber from the viewpoint of flexibility and thermal conductivity of the material, and it is preferable to use polyester fiber from the viewpoint of dimensional stability, rigidity and heat resistance, and further hydrophobicity and flexibility. From this point, it is preferable to use polyolefin fibers. The hydrophobic synthetic fiber may be a short fiber or a long fiber, but a long fiber is preferable from the viewpoint of the strength and flexibility of the nonwoven fabric. The fineness of the fiber is preferably in the range of 0.8 to 5.5 dtex for the same reason.
[0007]
Moreover, the nonwoven fabric for Cairo packaging materials of this invention contains the fiber of an irregular cross-sectional shape.
Here, the irregular cross-sectional shape refers to the cross-sectional shape of the fiber when cut in a direction perpendicular to the length direction of the fiber, and the abnormal cross-sectional shape fiber refers to a shape in which the cross-section of the fiber is substantially irregular. The fiber which has. By forming the nonwoven fabric with such irregular cross-sectional shape fibers, the unevenness of the fiber layer on the nonwoven fabric surface is reduced and the smoothness of the surface is improved compared to the same-weight non-woven fabric configured with round cross-sectional shape fibers. As a result, a clear print image can be obtained and the printability can be improved.
The fiber having an irregular cross-sectional shape is a fiber having an elliptical cross section, and the flatness of the cross section of the fiber is 1.3 or more, preferably 2 or more, and more preferably 2.5 to 5.0. Here, the flatness is a value obtained by measuring the short axis length a and the long axis length b of the fiber cross section and dividing the long axis length b by the short axis length a.
[0008]
The fiber having an irregular cross-sectional shape can be produced by, for example, extruding a molten resin from a nozzle having a flat cross-section, and after producing a round cross-sectional fiber, it may be crushed into a fiber having an irregular cross-section. In this case, the round cross-section fibers may be crushed in a fibrous form or after being formed into a non-woven fabric. Further, the non-woven fabric may contain a fiber having a round cross section as long as the object of the present invention is not impaired.
By configuring the nonwoven fabric with such irregular cross-sectional shape fibers, the thickness of the nonwoven fabric can be reduced while maintaining the strength of the nonwoven fabric, and the surface of the nonwoven fabric becomes smoother, thus maintaining the flexible fiber feel of the nonwoven fabric. However, the printability of the nonwoven fabric can be improved.
[0009]
The nonwoven fabric for warmer wrapping material of the present invention is produced by a papermaking method, a card machine, or the like, or by a spunbond method. From the viewpoint of strength, a long fiber nonwoven fabric by a spunbond method is preferable. Although the short fiber nonwoven fabric by a card machine etc. can give a cloth-like touch, the long fiber nonwoven fabric by the spunbond method has a practical strength because the fiber length is long, and by a wet method or a dry method. Unlike the case, the fiber is formed into a sheet as it is without performing an oil treatment or the like, so that the tactile sensation peculiar to the fiber can be further utilized.
The long fiber nonwoven fabric is manufactured by, for example, using continuous filaments melt-spun by a spunbond method as a web and bonding the webs. The web can be bonded with adhesives, low-melting fibers or composite fibers, bonded with a molten binder, or with a needle punch or hydroentanglement method that can leave the fiber feeling, but the fiber feel and strength are maintained. From this point, the joining by the partial thermocompression bonding method is preferable.
[0010]
The area ratio of thermocompression bonding in partial thermocompression bonding is preferably 5 to 35% from the viewpoint of maintaining strength. The partial thermocompression bonding can be performed through an ultrasonic method or a web between heated embossing rolls, whereby pinned and rectangular floating patterns can be scattered on the surface of the nonwoven fabric. The basis weight of the nonwoven fabric is appropriately selected according to the purpose of use, but is preferably 25 to 60 g / m 2 from the viewpoint of practical strength and touch.
[0011]
Furthermore, the nonwoven fabric for warmer wrapping material of the present invention needs to have an average surface roughness (Ra) of at least one surface in the vertical and horizontal directions of 12 μm or less. When the average surface roughness of the nonwoven fabric in the vertical and horizontal directions exceeds 12 μm, a clear image cannot be obtained, and the density of the printed surface is reduced. The higher the surface smoothness of the nonwoven fabric, the better the printability. However, the surface roughness Ra in the longitudinal direction of the nonwoven fabric is preferably 10 μm or less, more preferably 9 μm or less. Further, the surface roughness Ra in the transverse direction of the nonwoven fabric is more preferably 11 μm or less. The longitudinal direction of the nonwoven fabric refers to the machine winding direction, and the lateral direction refers to the machine width direction.
[0012]
The disposable body warmer of the present invention is obtained by laminating a warmer wrapping material obtained by laminating a nonwoven fabric containing a hydrophobic synthetic fiber having the above-mentioned irregular cross-sectional shape and a film, and putting a heating element composition between them, Can be obtained by sealing the periphery of the substrate with a heat seal or an adhesive. The nonwoven fabric for warmer packaging material of the present invention may be used on both sides of the warmer, but may be used only on one side.
[0013]
Films to be bonded to the nonwoven fabric include: LDPE (low density polyethylene), LLDPE (linear low density polyethylene), HDPE (high density polyethylene), various polyethylenes such as metallocene catalyst PE, polyolefins such as polypropylene, EVA and ethylene Films such as polyolefin copolymer such as various copolymer polypropylenes such as propylene and butene, polyamide, and polyester may be used, and a microporous film having moisture permeability may be used. From the viewpoint of flexibility, sealing properties, and cost, polyethylene or a copolymer olefin film thereof is preferable. Moreover, what combined the film of 2-3 layers from the point of compatibility with a fiber layer and the sealing performance of a warmer may be used.
The bonding of the nonwoven fabric and the film can be performed by a method using an adhesive such as heat sealing, thermal bonding, or a hot melt agent, and may be full surface bonding or partial bonding. In the case of partial bonding, it becomes easy to maintain the flexibility of the nonwoven fabric. The air holes necessary as a disposable body warmer can be provided by drilling after laminating, but a perforated or microporous film may be used.
[0014]
Printing on the surface of the nonwoven fabric can be performed by a known method such as gravure printing, flexi printing, screen printing, transfer printing or the like. Moreover, after performing pre-processing such as electric discharge machining for improving printability, these printings may be performed. The ink used for printing is not particularly limited, but since a non-woven fabric for warmer packaging is used as the outer surface, select a printing ink that is compatible with the non-woven fabric material in order to prevent ink from fading due to rubbing during dry and wet conditions. It is preferable to do.
The sharpness of printing on the non-woven fabric surface can be evaluated by the number of discontinuities of the printed line described later / 6 mm. The number of breaks is preferably 2/6 mm or less, and more preferably 0/6 mm (no breaks). If the number of breaks is 2/6 mm or less, the printed surface becomes clear.
[0015]
Since the nonwoven fabric for warmer packaging materials of the present invention is composed of fibers having an irregular cross-sectional shape, it has excellent surface smoothness and printability. Also, during web production, the fibers are easier to align with the long sides of the cross section facing in the plane direction, making the thickness thinner and easier to bend in the plane direction than flexible non-woven fabrics with round cross sections. It is easy to feel the nature and becomes a comfortable heat transfer medium. Furthermore, since the nonwoven fabric excellent in the smoothness of the surface is used, it is excellent in touch and flexibility, and the laminate strength with the film is improved.
[0016]
【Example】
Hereinafter, the present invention will be specifically described by way of examples. The characteristics in the examples were measured or evaluated as follows.
1) Nonwoven thickness: Measured with a peacock thickness measuring instrument at a load of 100 g / cm 2 .
2) Strength of nonwoven fabric and stress at 5% elongation: Measured according to JIS L-1906.
3) Flatness of nonwoven fabric fiber: The minor axis length a and the major axis length b of the fiber cross section were measured, and the value obtained by dividing the major axis length b by the minor axis length a was defined as the flatness. In addition, although flatness is not constant in the case where the round cross-section fiber is crushed, the cross-section is measured on the assumption that the deformed fiber on the nonwoven fabric surface is similar to the flat yarn.
4) Flexural flexibility of nonwoven fabric: measured as follows as an index indicating flexibility.
The sample piece (width 5 cm × measurement direction length 4 cm), leaving one end 1 cm in the measurement direction, holding the sample piece with a scale across the entire width in a direction perpendicular to the sample piece, without making the other end of the sample piece creased, Place the loop on the end pressed by the scale. While holding the end of the side pressed by the scale by hand, the scale is slid over the sample piece and moved into the loop. The point at which the loop is extended by the repulsive force of the sample is defined as the end point, and the length from this point to the loop side end is defined as the critical length (mm). A shorter one indicates more flexibility.
[0017]
5) Smoothness of the nonwoven fabric: Using a surface roughness shape measuring machine (Surfcom 110A manufactured by Tokyo Seimitsu Co., Ltd.), the average roughness Ra (μm) of the surface in the longitudinal and lateral directions of the nonwoven fabric is measured, and the measured value is obtained. The nonwoven fabric was smooth. It shows that it is so smooth that a numerical value is small.
6) Printing on non-woven fabric: PO film surface printing General purpose ink (Toyo Ink Manufacturing Co., Ltd., PANN color S39 indigo blend, 20% pigment concentration) is gravure (150 m) on a small rotary press at a line speed of 30 m / min. (Mesh, plate depth 30 μm) Transfer printing was performed.
7) Density / color difference meter (printed by MINOLTA: measuring head CR-100) of the printed surface of the nonwoven fabric, the color of the printed surface of the nonwoven fabric is measured, and the L value, a value, and b value of the measured values are printed density. It was. In particular, the smaller the L value, the less white, and the smaller the b value for blue, the more blue and the darker the printed surface density is.
8) Sharpness of printed surface of non-woven fabric: A 0.4 mm thick linear pattern was printed on the non-woven fabric surface, and the number of prints interrupted within a 6 mm long section of the printed line was measured. The numerical value was defined as the sharpness of the printed surface of the nonwoven fabric. The smaller the value, the clearer the print surface is without interruption of printing.
[0018]
Example 1
Nylon 6 (relative viscosity 2.7) was used as a raw material, and long fibers melt-extruded from a nozzle having a flat cross section were taken up by an air soccer traction device while cooling from the side near the nozzle. The yarn exiting the pulling and taking-up device was passed through a charging device, opened, and then collected as a web on a moving wire mesh conveyor. This web was passed between a heated embossing roll and a flat roll, and partially thermocompression bonded to obtain a non-woven fabric having a dotted pattern with a deformed quadrilateral weave pattern (crimp area ratio 14.5%). .
The constituent fiber of the obtained nonwoven fabric was a flat cross-sectional yarn of 2.0 dtex and a flatness of 2.5, and the basis weight was 40 g / m 2 . The properties of this nonwoven fabric are shown in Table 1.
[0019]
After gravure printing a logo pattern on the nonwoven fabric surface (anti-laminate surface), 50 μm polyethylene (LLDPE) film was laminated on the non-embossed surface of the nonwoven fabric, About 6%) and used as a packaging material for warmers. Use the obtained warmer packaging material as the upper layer, and use the non-woven film laminated non-woven fabric for the lower layer, superimpose the film surface on the inside, fill it with exothermic composition, and heat seal the surroundings A disposable body warmer was obtained.
The resulting disposable body warmer was printed with a clear image on the outer nonwoven fabric compared to conventional body warmers using round cross-section fibers, had a smooth feel and flexibility, and had an appropriate touch. .
[0020]
Example 2
In Example 1, except that the flatness of nylon 6 constituting the non-woven fabric was set to 3.0, a packaging material for a warmer was produced in the same manner as in Example 1, and printed on this to produce a disposable warmer. The performance of the obtained nonwoven fabric is shown in Table 1. As in Example 1, it was a warmer with excellent flexibility on which a clear image was printed.
[0021]
Example 3
In Example 1, a normal round cross-section nylon 6 fiber was used instead of the flat cross-section nylon 6, and in the same manner as in Example 1, 2.0 dtex, a texture pattern (crimp area ratio 14.5%), and a basis weight of 40 g / A non-woven fabric of m 2 was obtained. The nonwoven fabric was passed through a calender device in which a smooth metal roll having a surface temperature of 150 ° C. and a paper roll were combined to smooth the fiber layer on the surface. As a result of observing the surface fiber with a microscope, it was a deformed fiber corresponding to a flatness of 1.6. This non-woven fabric was thin like the non-woven fabric using the modified cross-section yarn, had a smooth surface and a soft touch. The performance of this nonwoven fabric is shown in Table 1.
Using this smoothed non-woven fabric, the surface was printed in the same manner as in Example 1, and then laminated with a microporous polyethylene film having a moisture permeability of 40 μm to produce a disposable body warmer. The obtained disposable warmer was a warmer excellent in flexibility with a clear pattern printed, similar to the warmer using flat cross-section fibers.
[0022]
Example 4
In Example 1, partially thermocompression-bonded spunbond (thermocompression area ratio 14.5% weave pattern, basis weight 40 g / m 2 ) using polyethylene terephthalate fiber (2.0 dtex, flatness 3.2) instead of nylon 6 )
Using this nonwoven fabric, a disposable body warmer having a printed surface was produced in the same manner as in Example 1. This warmer printed vividly, had tension compared to nylon 6 fiber, and had excellent dimensional stability.
[0023]
Example 5
The nonwoven fabric obtained in Example 4 was passed through a calender device in which smooth metal rolls having a surface temperature of 220 ° C. were combined, and the surface fiber layer was further thinned and smoothed. The performance of this nonwoven fabric is shown in Table 1.
Using this smoothed nonwoven fabric, the surface was printed in the same manner as in Example 4 to produce a disposable body warmer. The obtained disposable warmer had a smooth surface and a sharper pattern. Moreover, it was somewhat rigid and suitable for the use of shoe soles and the like.
[0024]
Example 6
A nonwoven fabric was obtained in the same manner as in Example 1, except that polypropylene (MFR = 40 measured under the conditions of Table 1 of JISK-7210) was used as a raw material. The constituent fibers of the obtained nonwoven fabric were 2.5 dtex, flatness 3.5, partial thermocompression area ratio 7% pinpoint pattern, and basis weight 40 g / m 2 . In the same manner as in Example 1, a disposable body warmer was manufactured in the same manner as in Example 1 except that the surface was printed, and the film to be laminated was a 40 μ film in which LDPE and metallocene catalyst polyethylene (seal surface) were half laminated. The performance of the nonwoven fabric is shown in Table 1, and it was excellent in printability as in Example 1.
[0025]
Comparative Examples 1-3
In Example 1, non-woven fabrics were produced using nylon 6 fibers (2.0 dtex), polyethylene terephthalate fibers (2.0 dtex) and polypropylene fibers (2.8 dtex) having a round cross section, and performance comparison was performed.
The performance of the nonwoven fabric is shown in Table 1. All the nonwoven fabrics were inferior in the sharpness of the printed image as compared with the examples.
[0026]
[Table 1]
【The invention's effect】
The non-woven fabric for warmer wrapping materials with excellent printability according to the present invention is composed of hydrophobic synthetic fibers having an irregular cross-sectional shape, so that the thickness of the non-woven fabric can be reduced, it is soft and excellent in touch, and its surface is smooth. Therefore, it is possible to obtain a disposable body warmer having excellent printability, a clear and high print density image, and excellent appearance quality.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002189369A JP4122182B2 (en) | 2002-06-28 | 2002-06-28 | Non-woven fabric for disposable warmers and disposable warmers with excellent printability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002189369A JP4122182B2 (en) | 2002-06-28 | 2002-06-28 | Non-woven fabric for disposable warmers and disposable warmers with excellent printability |
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| Publication Number | Publication Date |
|---|---|
| JP2004024748A JP2004024748A (en) | 2004-01-29 |
| JP4122182B2 true JP4122182B2 (en) | 2008-07-23 |
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| JP2002189369A Expired - Lifetime JP4122182B2 (en) | 2002-06-28 | 2002-06-28 | Non-woven fabric for disposable warmers and disposable warmers with excellent printability |
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| JP (1) | JP4122182B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0663769U (en) * | 1991-04-30 | 1994-09-09 | 嘉宏 竹原 | Door safety opening / closing support device |
| JPH0719558U (en) * | 1993-09-16 | 1995-04-07 | 山商機電株式会社 | Open / close door mounting structure |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5267935B2 (en) * | 2008-12-25 | 2013-08-21 | 東洋紡株式会社 | Method for producing long-fiber non-woven fabric used as a base cloth for disposable body warmers |
| JP5622442B2 (en) * | 2010-05-31 | 2014-11-12 | 花王株式会社 | Heating tool |
| JP5888495B2 (en) * | 2012-01-11 | 2016-03-22 | 東洋紡株式会社 | Long-fiber nonwoven fabric with excellent flexibility and wear resistance and its use |
| JP5935327B2 (en) * | 2012-01-11 | 2016-06-15 | 東洋紡株式会社 | Non-woven for Cairo |
| JP6976698B2 (en) * | 2017-03-14 | 2021-12-08 | 旭化成株式会社 | Long-fiber non-woven fabric for body warmers and disposable body warmers using this |
| WO2020179135A1 (en) * | 2019-03-01 | 2020-09-10 | 花王株式会社 | Heating tool |
| KR102491047B1 (en) * | 2020-11-11 | 2023-01-19 | 주식회사 알티넷 | Image printing method of Respiratory protection mask |
-
2002
- 2002-06-28 JP JP2002189369A patent/JP4122182B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0663769U (en) * | 1991-04-30 | 1994-09-09 | 嘉宏 竹原 | Door safety opening / closing support device |
| JPH0719558U (en) * | 1993-09-16 | 1995-04-07 | 山商機電株式会社 | Open / close door mounting structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004024748A (en) | 2004-01-29 |
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