JP3429859B2 - Wrinkled nonwoven fabric - Google Patents
Wrinkled nonwoven fabricInfo
- Publication number
- JP3429859B2 JP3429859B2 JP15291594A JP15291594A JP3429859B2 JP 3429859 B2 JP3429859 B2 JP 3429859B2 JP 15291594 A JP15291594 A JP 15291594A JP 15291594 A JP15291594 A JP 15291594A JP 3429859 B2 JP3429859 B2 JP 3429859B2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- fiber
- fiber layer
- temperature
- shrinkable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、その表面に多数の皺を
有する多皺性不織布に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrinkled nonwoven fabric having a large number of wrinkles on its surface.
【０００２】[0002]
【従来の技術】従来より、熱収縮性繊維の収縮特性を利
用した嵩高不織布が種々提案されており、車両用内装
材、インテリア用内装材、あるいは包装材として実用に
供されている。例えば、特開昭６２−１４１１６７号公
報には、潜在収縮性不織シートと熱収縮性の小さいシー
ト状物とを重ね互いの面において部分結合した後、熱処
理により収縮を発現させることにより、嵩高な表面構造
を有する複合シートを得ることができる旨、記載されて
いる。また、特開平２−１３３６４１号公報には、収縮
性繊維ウェブ層と非収縮性繊維ウェブ層とを積層した積
層ウェブに高圧柱状水流を施して両者を一体化し、次い
で熱処理を施して収縮性繊維を収縮させることにより表
面に凹凸を発現させることができる旨、記載されてい
る。その他に、特開平１−２０１５６９号公報や特開平
６−３３３５９号公報においては、熱収縮性のシート状
物と長繊維不織布を一体化し、これに加熱処理を施して
熱収縮性シート状物を収縮させることにより、長繊維不
織布の表面に多数の皺を形成することができる旨、記載
されている。いずれも積層型の不織布であり、各層の収
縮率の差を利用して、嵩高不織布とする点で共通してい
る。2. Description of the Related Art Conventionally, various bulky nonwoven fabrics utilizing the shrinkage characteristics of heat-shrinkable fibers have been proposed and put to practical use as interior materials for vehicles, interior materials for interiors, or packaging materials. For example, in Japanese Unexamined Patent Publication No. 62-141167, a latent shrinkable nonwoven sheet and a sheet material having a small heat shrinkability are superposed and partially bonded to each other, and then heat treatment is performed to cause shrinkage, resulting in high bulkiness. It is described that a composite sheet having a different surface structure can be obtained. Further, in JP-A-2-133641, a laminated web obtained by laminating a shrinkable fibrous web layer and a non-shrinkable fibrous web layer is subjected to high-pressure columnar water flow to integrate them, and then heat-treated to give a shrinkable fiber. It is described that the surface can be made uneven by shrinking the. In addition, in JP-A-1-201569 and JP-A-6-33359, a heat-shrinkable sheet-like material and a long-fiber non-woven fabric are integrated and heat-treated to obtain a heat-shrinkable sheet-like material. It is described that a large number of wrinkles can be formed on the surface of the long-fiber nonwoven fabric by shrinking. All of them are laminated type non-woven fabrics, and they are common in that they are bulky non-woven fabrics by utilizing the difference in shrinkage ratio of each layer.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述の
嵩高不織布には以下の問題がある。例えば、収縮性シー
トと非収縮性シートを部分結合させたものは、凸状部が
部分結合部と部分結合部の間においてのみ形成されるの
で、その表面には規則的な凹凸しかできない。そのた
め、場合によっては面白みに欠け、十分な意匠効果を奏
することができないこともある。また、収縮性シートと
非収縮性シートをニードルパンチングや高圧柱状水流処
理による繊維間交絡でもって一体化させた場合は、前記
のような不都合はなく、皺状の自然な感じの凹凸を形成
させることができるが、ニードルパンチングや高圧水流
による繊維間交絡は、積層体を構成するシート状物の構
造によっては難しいといった問題がある。特に低目付の
不織布、あるいはスポンボンド不織布や、メルトブロー
不織布、フィルムを用いる場合に、その傾向が顕著にあ
らわれる。また、高圧水流処理を施した不織布は、他の
手段でもって形成される不織布に比べてコストが高くな
るため、包装材等、廉価なものが好まれる用途には汎用
されにくいという事情もある。However, the above-mentioned bulky nonwoven fabric has the following problems. For example, in the case where the shrinkable sheet and the non-shrinkable sheet are partially bonded, since the convex portions are formed only between the partial bonding portions, the surface thereof has only regular unevenness. Therefore, in some cases, it may not be interesting and a sufficient design effect may not be achieved. In addition, when the shrinkable sheet and the non-shrinkable sheet are integrated by interfiber entanglement by needle punching or high-pressure columnar water treatment, there is no such inconvenience, and wrinkle-like natural unevenness is formed. However, there is a problem that inter-fiber entanglement by needle punching or high-pressure water flow is difficult depending on the structure of the sheet-like material constituting the laminate. In particular, when a low basis weight nonwoven fabric, sponge bonded nonwoven fabric, melt blown nonwoven fabric, or film is used, this tendency is remarkable. Further, since the cost of the non-woven fabric subjected to the high-pressure water flow is higher than that of the non-woven fabric formed by other means, it is difficult to use the non-woven fabric for applications such as packaging materials, which are inexpensive.
【０００４】そこで、本発明者らは、積層体の層間、つ
まりシート状物間の接合を熱接着により行えば、低目付
不織布や、スパンボンド不織布、メルトブロー不織布等
を任意に用いることができると考え、さらには低コスト
の不織布を提供できることから、層間の熱接着について
検討した結果、熱収縮性繊維と熱接着性繊維を含む第一
繊維層と、非収縮性繊維からなる第二繊維層を積層し、
熱処理によって両者を接合した後、さらに熱処理を施し
て熱収縮性繊維を収縮させたところ、収縮によって第二
繊維層に皺状の凹凸が形成され、その凸部が第一繊維層
から浮き上がった構造となり、極めて優れた意匠効果を
呈する嵩高な多皺性不織布を得ることができた。以下そ
の内容を詳述する。Therefore, the inventors of the present invention can arbitrarily use a low-basis weight nonwoven fabric, a spunbonded nonwoven fabric, a meltblown nonwoven fabric, etc., by joining the layers of the laminate, that is, the sheet-like materials, by thermal bonding. In consideration of the above, since it is possible to provide a low-cost non-woven fabric, as a result of investigating the thermal bonding between layers, a first fiber layer containing heat-shrinkable fibers and heat-bondable fibers and a second fiber layer made of non-shrinkable fibers are obtained. Stacked
After joining the two by heat treatment, the heat-shrinkable fiber was further subjected to heat treatment to shrink the heat-shrinkable fiber, and the wrinkle-like unevenness was formed in the second fiber layer due to the shrinkage, and the projection was raised from the first fiber layer. Thus, it was possible to obtain a bulky, wrinkled nonwoven fabric exhibiting an extremely excellent design effect. The details will be described below.
【０００５】[0005]
【課題を解決するための手段】本発明の多皺性不織布
は、融解ピーク温度（Ｔｍ℃）が１３０＜Ｔｍ＜１４５
のエチレン−プロピレンランダム共重合体を７０重量％
以上含むポリマーからなる最大熱収縮率が少なくとも５
０％である熱収縮性繊維と、融点が熱収縮性繊維の収縮
開始温度よりも低いポリマーからなる熱接着性繊維を含
んでなる第一繊維層の片面もしくは両面に、前記熱収縮
性繊維が収縮する温度では本質的に熱収縮しない第二繊
維層を積層し、この積層体に熱接着性繊維の融点よりも
高くかつ熱収縮性繊維の収縮開始温度よりも低い温度で
熱処理を施して第一繊維層中の熱接着性繊維によって積
層体を一体化した後、さらに１００＜Ｔ≦Ｔｍ＋３０の
温度（Ｔ℃）で熱処理を施して、第一繊維層を収縮させ
ることにより、第二繊維層に多数の皺を形成させたもの
である。The multi-wrinkled nonwoven fabric of the present invention has a melting peak temperature (Tm ° C.) of 130 <Tm <145.
70% by weight of ethylene-propylene random copolymer
The maximum heat shrinkage ratio of the above polymer is at least 5
On one or both sides of the first fiber layer comprising a heat-shrinkable fiber of 0% and a heat-adhesive fiber made of a polymer having a melting point lower than the shrinkage initiation temperature of the heat-shrinkable fiber, the heat-shrinkable fiber is A second fiber layer, which is essentially not heat-shrinkable at the shrinking temperature, is laminated, and this laminate is heat-treated at a temperature higher than the melting point of the heat-adhesive fiber and lower than the shrinkage start temperature of the heat-shrinkable fiber to produce a first layer. After the laminated body is integrated by the heat-adhesive fibers in one fiber layer, the heat treatment is further performed at a temperature of 100 <T ≦ Tm + 30 (T ° C.) to shrink the first fiber layer, thereby the second fiber layer. A large number of wrinkles are formed on the surface.
【０００６】第一繊維層に含まれる熱収縮性繊維は、融
解ピーク温度（Ｔｍ℃）が１３０＜Ｔｍ＜１４５のエチ
レン−プロピレンランダム共重合体を７０重量％以上含
むポリマーからなり、最大熱収縮率が少なくとも５０％
であるものが好ましい。ここで融解ピーク温度とは示差
走査熱量計（ＤＳＣ）によりポリマーの融解熱測定を行
ったときにＤＳＣ曲線が最高値を示すときの温度をい
う。ここで融解ピーク温度が１３０℃未満であると、後
述する熱接着性繊維の選択範囲が狭くなり、１４５℃を
超えると、繊維の乾熱収縮性が通常のポリプロピレン繊
維程度になってしまうので好ましくない。The heat-shrinkable fiber contained in the first fiber layer is composed of a polymer containing 70% by weight or more of an ethylene-propylene random copolymer having a melting peak temperature (Tm ° C.) of 130 <Tm <145 and having a maximum heat shrinkage. At least 50%
Are preferred. Here, the melting peak temperature means the temperature at which the DSC curve shows the maximum value when the heat of fusion of the polymer is measured by a differential scanning calorimeter (DSC). If the melting peak temperature is less than 130 ° C., the selection range of the heat-adhesive fiber to be described later is narrowed, and if it exceeds 145 ° C., the dry heat shrinkability of the fiber becomes about that of a normal polypropylene fiber, which is preferable. Absent.
【０００７】エチレン−プロピレンランダム共重合体
は、前記温度範囲内で優れた収縮性を示すポリマーであ
り、それのみからなる３倍程度に延伸された繊維は、融
点直下の１３５℃で１分以内に９３％の熱収縮率を示
す。よって、熱収縮性を制御するために他のポリマーを
混合することができるが、本願発明においてはエチレン
−プロピレンランダム共重合体の割合は７０重量％以上
であることが望ましい。７０重量％未満では得られる繊
維の最大熱収縮率が５０％未満となり、熱収縮が不十分
となるからである。ここで最大熱収縮率とは、１４５℃
の雰囲気下に１分間置いた場合に示す収縮率のことであ
る。The ethylene-propylene random copolymer is a polymer exhibiting excellent shrinkability in the above temperature range, and a fiber made of only the same and stretched about 3 times has a temperature of 135 ° C. just below the melting point and within 1 minute. Shows a heat shrinkage of 93%. Therefore, other polymers can be mixed in order to control the heat shrinkability, but in the present invention, the proportion of the ethylene-propylene random copolymer is preferably 70% by weight or more. This is because if it is less than 70% by weight, the maximum heat shrinkage of the obtained fiber will be less than 50%, and the heat shrinkage will be insufficient. Here, the maximum heat shrinkage is 145 ° C
The shrinkage ratio is shown when left in the atmosphere for 1 minute.
【０００８】エチレン−プロピレンランダム共重合体と
混合させるポリマーとしては、エチレン−ブテン-1−ポ
リプロピレンの三元共重合体や、ポリプロピレン等のオ
レフィン系ポリマーを用いることができる。As the polymer to be mixed with the ethylene-propylene random copolymer, a terpolymer of ethylene-butene-1-polypropylene or an olefin polymer such as polypropylene can be used.
【０００９】第一繊維層において前記熱収縮性繊維が占
める割合は、３０〜７０重量％であることが望ましい。
より好ましくは４０〜６０重量％である。３０重量％未
満では、第一繊維層全体の収縮が不十分で、第二繊維層
に皺を形成させることができず、７０重量％を超えると
第一繊維層の収縮は十分であるが、熱接着性繊維の割合
が少なくなるので第一繊維層と第二繊維層の接着が不十
分となり好ましくない。The proportion of the heat-shrinkable fibers in the first fiber layer is preferably 30 to 70% by weight.
More preferably, it is 40 to 60% by weight. If it is less than 30% by weight, the shrinkage of the entire first fiber layer is insufficient, and wrinkles cannot be formed in the second fiber layer. If it exceeds 70% by weight, the shrinkage of the first fiber layer is sufficient. Since the proportion of the heat-adhesive fibers decreases, the adhesion between the first fiber layer and the second fiber layer becomes insufficient, which is not preferable.
【００１０】第一繊維層と第二繊維層を熱接着により一
体化させるべく、第一繊維層には熱接着成分として熱接
着性繊維が含まれる。この熱接着性繊維は、その融点が
前記熱収縮性繊維の収縮開始温度よりも低いポリマーで
構成されなければならない。但し、エチレン−プロピレ
ンランダム共重合体の熱収縮は、９０℃程度の雰囲気下
でも僅かではあるが開始するので、ここでいう収縮開始
温度を厳密に解する必要はなく、その熱収縮率が１０％
以内であるような温度であれば収縮開始温度よりも低い
温度であるとみなせる。具体的には、融点が８０〜１１
０℃の範囲内にあるポリマーが望ましい。このような融
点を持つポリマーとしては、エチレン−アクリル酸メチ
ル共重合体、エチレン−アクリル酸共重合体、エチレン
−アクリル酸エチル共重合体、エチレン−メタクリル酸
メチル共重合体、エチレン−メタクリル酸エチル共重合
体、エチレン−アクリル酸メチル−アクリル酸共重合
体、トリエステル共重合体、ポリアミド共重合体等を挙
げることができ、これらが繊維表面の全部もしくは一部
をしめるような単一型繊維、芯鞘型複合繊維、分割型複
合繊維を熱接着性繊維として使用することができる。第
一繊維層における熱接着性繊維の割合は少なくとも３０
重量％でなければならない。３０重量％未満であると第
一繊維層と第二繊維層の間の熱接着が不十分となるから
である。In order to integrate the first fiber layer and the second fiber layer by heat bonding, the first fiber layer contains a heat bonding fiber as a heat bonding component. The heat-bondable fiber must be composed of a polymer whose melting point is lower than the shrinkage initiation temperature of the heat-shrinkable fiber. However, since the heat shrinkage of the ethylene-propylene random copolymer starts slightly even in an atmosphere of about 90 ° C., it is not necessary to exactly understand the shrinkage start temperature here, and the heat shrinkage rate is 10%. %
If the temperature is within the range, it can be considered that the temperature is lower than the contraction start temperature. Specifically, the melting point is 80 to 11
Polymers in the 0 ° C. range are desirable. As the polymer having such a melting point, ethylene-methyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate Copolymers, ethylene-methyl acrylate-acrylic acid copolymers, triester copolymers, polyamide copolymers and the like can be mentioned, and these are single-type fibers which occupy all or part of the fiber surface. The core-sheath type composite fiber and the split type composite fiber can be used as the heat-adhesive fiber. The proportion of heat-bondable fibers in the first fiber layer is at least 30.
Must be% by weight. This is because if it is less than 30% by weight, thermal adhesion between the first fiber layer and the second fiber layer becomes insufficient.
【００１１】熱収縮性繊維および熱接着性繊維の占める
割合が上述の範囲内にあれば、第一繊維層には他の繊維
が混合されていてもよい。混合する繊維は特に限定され
ず、レーヨン等の再生繊維、アセテート等の半合成繊
維、ナイロン６、ナイロン６６等のポリアミド系繊維、
ポリエチ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、ポリプロピレン、ポリエ
チレン等のポリオレフィン系繊維等から任意に一あるい
は二以上選択して使用することができる。Other fibers may be mixed in the first fiber layer as long as the ratio of the heat shrinkable fibers and the heat adhesive fibers is within the above range. The fibers to be mixed are not particularly limited, and recycled fibers such as rayon, semi-synthetic fibers such as acetate, polyamide fibers such as nylon 6 and nylon 66,
One or more selected from polyester fibers such as polyethylene terephthalate and polybutylene terephthalate and polyolefin fibers such as polypropylene and polyethylene can be used.
【００１２】勿論、第一繊維層は熱収縮性繊維と熱接着
性繊維のみからなっていてもよく、その場合は、熱接着
性繊維の占める割合が３０〜７０重量％であることが好
ましい。７０重量％を超えると熱収縮性繊維の占める割
合が小さくなり第一繊維層の収縮が不十分となるからで
ある。Of course, the first fiber layer may consist of only heat-shrinkable fibers and heat-adhesive fibers. In that case, the proportion of the heat-adhesive fibers is preferably 30 to 70% by weight. This is because if it exceeds 70% by weight, the proportion of the heat-shrinkable fiber becomes small and the shrinkage of the first fiber layer becomes insufficient.
【００１３】熱接着性繊維を用いる替わりに、エチレン
−プロピレンランダム共重合体を７０重量％以上含むポ
リマー（以下、熱収縮成分という場合がある）を芯成
分、熱収縮成分の収縮開始温度よりも低い融点を持つポ
リマーを鞘成分とした複合繊維を用いてもよい。この複
合繊維は、熱収縮性と熱接着性を併せもつことになるの
で、これを用いて本発明の不織布を製造する場合、混綿
工程を省略することができるといった利点がある。その
場合、第一繊維層に占める複合繊維の割合は５０重量％
以上であることが望ましい。５０重量％未満では、熱接
着および熱収縮が不十分となるからである。複合繊維の
割合が５０重量％以上であれば他の繊維を混合すること
ができ、その種類等は特に限定されず、レーヨン等の再
生繊維、アセテート等の半合成繊維、ポリエチレンテレ
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、ポリエチレン、ポリプロピレン等のポリオ
レフィン系繊維、ナイロン６、ナイロン６６等のポリア
ミド系繊維の中から任意に一あるいは二以上選択して混
合することができる。Instead of using the heat-adhesive fiber, a polymer containing 70% by weight or more of an ethylene-propylene random copolymer (hereinafter, sometimes referred to as a heat-shrinking component) is used as a core component, and the shrinkage starting temperature of the heat-shrinking component is lower than that. You may use the composite fiber which used the polymer which has a low melting point as a sheath component. Since this composite fiber has both heat shrinkability and heat adhesiveness, when the nonwoven fabric of the present invention is produced using this, there is an advantage that the mixing step can be omitted. In that case, the ratio of the composite fiber in the first fiber layer is 50% by weight.
The above is desirable. This is because if it is less than 50% by weight, heat adhesion and heat shrinkage are insufficient. Other fibers can be mixed as long as the ratio of the composite fiber is 50% by weight or more, and the type thereof is not particularly limited, and regenerated fiber such as rayon, semi-synthetic fiber such as acetate, polyethylene terephthalate, polybutylene terephthalate. It is possible to arbitrarily mix one or two or more of polyester fibers such as the above, polyolefin fibers such as polyethylene and polypropylene, and polyamide fibers such as nylon 6 and nylon 66, and to mix them.
【００１４】この複合繊維の鞘成分は、収縮開始温度よ
りも低い融点を有するポリマーから構成されていれば、
その種類は特に限定されず、例えばエチレン−アクリル
酸メチル共重合体、エチレン−アクリル酸共重合体、エ
チレン−アクリル酸エチル共重合体、エチレン−メタク
リル酸メチル共重合体、エチレン−メタクリル酸エチル
共重合体、エチレン−アクリル酸メチル−アクリル酸共
重合体等の融点が８０〜１１０℃の範囲にあるポリマー
を用いることができる。そして繊維断面における鞘／芯
成分の比は、熱接着性と収縮性を考慮すると、３／７〜
７／３であることが望ましい。より好ましくは４／６〜
６／４である。If the sheath component of the composite fiber is composed of a polymer having a melting point lower than the shrinkage initiation temperature,
The type is not particularly limited, and examples thereof include ethylene-methyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer. Polymers having a melting point in the range of 80 to 110 ° C. such as polymers and ethylene-methyl acrylate-acrylic acid copolymers can be used. The ratio of the sheath / core component in the fiber cross section is 3/7 to, considering thermal adhesiveness and shrinkability.
It is preferably 7/3. More preferably from 4/6
It is 6/4.
【００１５】また、熱収縮成分と熱接着成分は、熱接着
の効率を考えた場合、芯鞘構造をとることが最も好まし
いが、熱接着成分が繊維表面の一部を占めているような
構成であれば、分割型複合繊維であっても適用すること
ができる。Further, the heat-shrinking component and the heat-adhesive component most preferably have a core-sheath structure in consideration of the efficiency of heat-adhesion, but the heat-adhesive component occupies a part of the fiber surface. So long as it is a splittable conjugate fiber, it can be applied.
【００１６】第一繊維層の目付は、特に限定を要するも
のでなく、第二繊維層との熱接着を効率よく行える範囲
であればよい。望ましくは５〜２０ｇ／ｍ2 である。The basis weight of the first fiber layer is not particularly limited as long as it is in a range capable of efficiently thermally adhering to the second fiber layer. It is preferably 5 to 20 g / m 2 .
【００１７】第一繊維層の片面もしくは両面に積層され
一体化される第二繊維層は、第一繊維層の熱収縮によ
り、多数の皺状の凹凸が形成されるものである。従って
第二繊維層を構成する繊維は、繊維集合物を形成するこ
とができ、熱収縮性繊維もしくは熱収縮成分が収縮する
温度において本質的に収縮しないものであれば素材等は
特に限定されない。例えばレーヨン等の再生繊維、アセ
テート等の半合成繊維、綿、ウール等の天然繊維、ポリ
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６
６等のポリアミド系繊維の中から任意に一あるいは二以
上選択して用いることができる。その繊維形状等も限定
されず、分割性複合繊維や異形断面を有する繊維等を任
意に用いることができる。The second fiber layer, which is laminated and integrated on one side or both sides of the first fiber layer, has a large number of wrinkled irregularities formed by thermal contraction of the first fiber layer. Therefore, the fibers constituting the second fiber layer are not particularly limited as long as they are capable of forming a fiber aggregate and do not substantially shrink at the temperature at which the heat-shrinkable fiber or the heat-shrinkable component shrinks. For example, recycled fibers such as rayon, semi-synthetic fibers such as acetate, natural fibers such as cotton and wool, polyolefin fibers such as polypropylene and polyethylene,
Polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, nylon 6, nylon 6
One or two or more can be arbitrarily selected and used from the polyamide-based fibers such as 6. The fiber shape and the like are also not limited, and splittable conjugate fibers, fibers having an irregular cross section, and the like can be arbitrarily used.
【００１８】第二繊維層は繊維集合物であれば、不織
布、織物、ウェブ等どのような状態のものであってもよ
い。但し、いずれの状態の繊維集合物を用いる場合で
も、第一繊維層が熱収縮するときには、第二繊維層の構
成繊維間に何らかの結合もしくは絡合を有していること
が本発明においては肝要である。もし第二繊維層を構成
している繊維間が結合もしくは絡合していなければ、第
一繊維層が収縮しても第二繊維層に皺状の凹凸が形成さ
れないからである。従って、第二繊維層としては、熱接
着不織布、ニードルパンチング不織布、水流交絡不織
布、スパンボンド不織布、メルトブロー不織布等のよう
に、構成繊維間が予め結合もしくは交絡された不織布を
使用することが好ましい。また、カードウェブのように
繊維間が全く結合もしくは交絡されていない繊維集合物
を用いる場合には、第一繊維層の熱収縮が開始するまで
に繊維間が結合もしくは絡合された状態になるものでな
ければならない。例えば、熱接着性繊維を含み、第一繊
維層と第二繊維層の熱接着時に、第二繊維層自身も熱接
着により一体化され不織布を形成するようなウェブであ
れば、都合よく用いることができる。The second fiber layer may be in any state such as non-woven fabric, woven fabric or web as long as it is a fiber aggregate. However, whichever state of the fiber aggregate is used, it is essential in the present invention that the first fiber layer has some bonding or entanglement between the constituent fibers of the second fiber layer when the first fiber layer thermally shrinks. Is. This is because if the fibers forming the second fiber layer are not bonded or entangled with each other, wrinkle-shaped irregularities are not formed in the second fiber layer even if the first fiber layer contracts. Therefore, it is preferable to use, as the second fiber layer, a non-woven fabric in which constituent fibers are previously bound or entangled, such as a heat-bonded non-woven fabric, a needle punching non-woven fabric, a hydroentangled non-woven fabric, a spunbonded non-woven fabric, and the like. When a fiber assembly in which fibers are not bound or entangled at all like a card web is used, the fibers are bound or entangled by the time heat contraction of the first fiber layer starts. Must be one. For example, a web containing heat-adhesive fibers, and the second fiber layer itself may be integrated by heat-bonding to form a non-woven fabric when the first fiber layer and the second fiber layer are heat-bonded, may be conveniently used. You can
【００１９】第二繊維層の目付は特に限定されず、５〜
１００ｇ／ｍ2 の範囲内であればよい。特に、１０〜３
０ｇ／ｍ2 程度のものを用いた場合、皺状の凹凸部が良
好に形成される。The basis weight of the second fiber layer is not particularly limited and may be 5 to
It may be in the range of 100 g / m 2 . Especially 10-3
When the material having a thickness of about 0 g / m 2 is used, wrinkle-like irregularities are satisfactorily formed.
【００２０】そして、前述したような熱収縮性の第一繊
維層の片面もしくは両面に、第二繊維層を積層し、これ
を第一繊維層に含まれる熱接着成分で一体化した後、さ
らに第一繊維層を収縮させることにより第二繊維層に多
数の皺状の凹凸が形成され、皺の凸部が第一繊維層から
浮き上がった多皺性不織布を得ることができる。Then, a second fiber layer is laminated on one or both sides of the heat-shrinkable first fiber layer as described above, and this is integrated with the heat-adhesive component contained in the first fiber layer. By shrinking the first fiber layer, a large number of wrinkle-shaped irregularities are formed on the second fiber layer, and a wrinkled nonwoven fabric in which the wrinkle protrusions are raised from the first fiber layer can be obtained.
【００２１】本発明において、第二繊維層は第一繊維層
の片面もしくは両面に積層することができる。片面のみ
に積層した場合は、第一繊維層が積層体の一面を占める
ことになり、熱処理後もその表面は平滑なままであるの
で、その上に編物、織物等の他の繊維集合物を積層、貼
付することもできる。両面に積層した場合は、表裏面そ
れぞれに皺状の凹凸が形成されるので、非常に嵩高な不
織布を得ることができる。In the present invention, the second fiber layer can be laminated on one side or both sides of the first fiber layer. When laminated on only one side, the first fiber layer occupies one side of the laminated body, and even after heat treatment, the surface remains smooth, so that other fiber aggregates such as knitted fabrics and woven fabrics are formed on it. It can also be laminated and attached. When laminated on both sides, wrinkle-like irregularities are formed on each of the front and back surfaces, so a very bulky nonwoven fabric can be obtained.
【００２２】第一繊維層と第二繊維層の接着は、第一繊
維層に含まれる熱接着成分を溶融・軟化することにより
行う。ここで熱接着成分とは具体的には、熱接着性繊維
もしくは熱収縮性複合繊維の鞘成分をいう。熱処理は、
熱接着成分の融点以上の温度で行う必要があるが、その
温度は、熱収縮性繊維もしくは熱収縮性複合繊維の熱収
縮成分の収縮開始温度よりも低い範囲に限られる。収縮
開始温度よりも高い温度で熱処理を行うと、接着と同時
に収縮が開始するため密度ムラ等が生じ、均一に熱接着
させることができなくなるからである。但し、前述した
通り、ここでいう収縮開始温度を厳密に解する必要はな
く、その熱収縮率が１０％以内であるような温度であれ
ば収縮開始温度よりも低い温度であるとみなせる。具体
的に望ましい熱接着温度は９０〜１１０℃である。The adhesion of the first fiber layer and the second fiber layer is performed by melting and softening the heat-adhesive component contained in the first fiber layer. Here, the heat-adhesive component specifically refers to a sheath component of the heat-adhesive fiber or the heat-shrinkable composite fiber. The heat treatment is
The temperature needs to be higher than the melting point of the heat-adhesive component, but the temperature is limited to a range lower than the shrinkage initiation temperature of the heat-shrinkable component of the heat-shrinkable fiber or the heat-shrinkable composite fiber. This is because if heat treatment is performed at a temperature higher than the shrinkage start temperature, shrinkage starts at the same time as the adhesion, resulting in density unevenness and the like, and uniform heat adhesion cannot be achieved. However, as described above, it is not necessary to strictly understand the shrinkage start temperature, and it can be considered that the temperature is lower than the shrinkage start temperature as long as the heat shrinkage rate is within 10%. A specifically desirable heat bonding temperature is 90 to 110 ° C.
【００２３】熱接着は、通常よく知られている方法に基
づいて行うことができる。例えば、熱ロールを用いて加
圧・加熱する方法を適用することができる。第一繊維層
と第二繊維層の接着の程度は、熱接着成分の割合、熱処
理条件等によって変わる。両繊維層間の接着力が弱い
と、最終的に得られる不織布の剥離強度が小さくなって
実用的でないといった問題があり、接着力が強すぎる
と、後で第二繊維層において皺状の凹凸を形成させる際
に、凸部が形成されにくくなり、良好な皺状の凹凸を形
成することができず好ましくない。そこで、得られる不
織布の用途等に応じて、温度、ロール圧等の熱接着条件
を適宜変化させる必要がある。The thermal bonding can be carried out based on a generally well-known method. For example, a method of applying pressure / heating using a hot roll can be applied. The degree of adhesion between the first fiber layer and the second fiber layer varies depending on the ratio of the heat-adhesive component, heat treatment conditions, and the like. If the adhesive force between the two fiber layers is weak, the peel strength of the finally obtained nonwoven fabric will be low, which is not practical.If the adhesive force is too strong, wrinkle-like irregularities will be formed later in the second fiber layer. At the time of forming, it becomes difficult to form a convex portion, and good wrinkle-shaped irregularities cannot be formed, which is not preferable. Therefore, it is necessary to appropriately change the thermal bonding conditions such as temperature and roll pressure according to the intended use of the obtained nonwoven fabric.
【００２４】熱接着後、さらに高い温度で熱処理を行
い、第一繊維層を収縮させると同時に第二繊維層に多数
の皺状の凹凸部を形成させる。このとき熱処理温度（Ｔ
℃）は１００＜Ｔ≦Ｔｍ＋３０の範囲内であることが望
ましい。１００℃未満では熱収縮が不十分であり、Ｔｍ
＋３０℃を超えると繊維が完全に溶融し収縮応力が著し
く低下するためである。熱処理は、熱風貫通型加工機を
使用することにより行うことができる。この場合、第一
繊維層の収縮率は、熱処理温度および滞留時間によって
決定される。一般に、熱処理温度が高い程、また滞留時
間が長い程、収縮率は大きくなる。After the thermal bonding, heat treatment is performed at a higher temperature to shrink the first fiber layer and simultaneously form a large number of wrinkle-shaped irregularities on the second fiber layer. At this time, the heat treatment temperature (T
C.) is preferably in the range of 100 <T ≦ Tm + 30. If the temperature is less than 100 ° C, heat shrinkage is insufficient, and Tm
This is because if the temperature exceeds + 30 ° C, the fibers are completely melted and the shrinkage stress is significantly reduced. The heat treatment can be performed by using a hot air penetration type processing machine. In this case, the shrinkage rate of the first fiber layer is determined by the heat treatment temperature and the residence time. Generally, the higher the heat treatment temperature and the longer the residence time, the greater the shrinkage rate.
【００２５】第一繊維層の熱収縮により第二繊維層に多
数の皺状の凹凸部が形成される。この凹凸部は図１およ
び図２に示すように、第二繊維層が第一繊維層から剥離
し、剥離部のうち第一繊維層の熱収縮した面積分だけが
余剰部分となりこれがアーチ状に浮き上がって形成され
たものである。このような剥離が生じる理由は定かでは
ないが、第一繊維層を熱収縮させる際の加熱処理によっ
て第一繊維層と第二繊維層間の接着力が部分的に弛緩
し、そこへ第一繊維層の収縮力が作用して両繊維層間が
完全に剥離すると考えられる。そして剥離しなかった部
分は、そのまま再度接着されて凹部を形成すると考えら
れる。Due to the heat shrinkage of the first fiber layer, many wrinkle-shaped irregularities are formed on the second fiber layer. As shown in FIGS. 1 and 2, the uneven portion is separated from the first fiber layer by the second fiber layer, and the heat-shrinked area of the first fiber layer in the peeled portion becomes an excess portion, which becomes an arch shape. It is formed by floating. Although the reason why such peeling occurs is not clear, the adhesive force between the first fiber layer and the second fiber layer is partially relaxed by the heat treatment for heat-shrinking the first fiber layer, and the first fiber It is considered that the contraction force of the layers acts to completely separate the two fiber layers. Then, it is considered that the part that has not been peeled off is re-bonded as it is to form a recess.
【００２６】第二繊維層に形成される皺状の凹凸の数、
形、大きさ等は様々な要因によって決定される。例え
ば、第二繊維層に形成される凹凸の凸部の高さ、つまり
最終的に得られる不織布の見掛けの厚みは、両繊維層間
の熱接着力（剥離強力）が大きい程、小さくなる傾向が
ある。また凹凸の数、形、大きさ等は、第一繊維層の収
縮の程度、第二繊維層の素材、目付、ドレープ性、スパ
ンボンド不織布であるか水流交絡不織布であるかといっ
た繊維層の形態の差異等によっても変化する。そしてこ
れらの要因が複雑に影響しあって波状や絞り状の種々の
形状・大きさの皺状の凹凸が形成される。The number of wrinkle-like irregularities formed on the second fiber layer,
The shape, size, etc. are determined by various factors. For example, the height of the convex portions of the concavities and convexities formed in the second fiber layer, that is, the apparent thickness of the finally obtained nonwoven fabric, tends to decrease as the thermal adhesive force (peel strength) between both fiber layers increases. is there. Also, the number, shape, size, etc. of the irregularities are the degree of shrinkage of the first fiber layer, the material of the second fiber layer, the basis weight, the drape property, the form of the fiber layer such as spunbonded nonwoven fabric or hydroentangled nonwoven fabric. It also changes depending on the difference in. These factors complicatedly influence each other to form wrinkle-shaped irregularities of various shapes and sizes, such as wavy and squeezed shapes.
【００２７】[0027]
【作用】本発明は、熱収縮性繊維と熱接着性繊維、もし
くは熱接着成分を鞘成分とする熱収縮性複合繊維を含む
第一繊維層と、本質的に熱収縮しない第二繊維層からな
る積層不織布であり、両繊維層の熱収縮率の差により、
多数の皺状の凹凸部が形成された不織布を得ることがで
きる。この中で第一繊維層は、各繊維層間を一体化させ
る役割をし、かつそれ自身著しく熱収縮して第二繊維層
に多数の皺状の凹凸を形成させるのである。つまり第一
繊維層に含まれる熱接着成分が、熱接着成分の融点より
も高くかつ熱収縮成分の収縮開始温度よりも低い温度で
熱処理されることにより、各繊維層間を接着せしめる役
割をし、さらに熱収縮成分の収縮開始温度よりも高い温
度で熱処理されることにより、第一繊維層が熱収縮しそ
れによって第二繊維層に多数の皺状の凹凸が形成される
のである。The present invention comprises a first fiber layer containing a heat-shrinkable fiber and a heat-adhesive fiber, or a heat-shrinkable composite fiber having a heat-adhesive component as a sheath component, and a second fiber layer which does not essentially heat-shrink. It is a laminated nonwoven fabric consisting of
It is possible to obtain a nonwoven fabric on which a large number of wrinkle-shaped irregularities are formed. Among them, the first fiber layer plays a role of integrating the respective fiber layers, and it itself undergoes remarkable heat shrinkage to form a large number of wrinkle-shaped irregularities on the second fiber layer. That is, the heat-bonding component contained in the first fiber layer is heat-treated at a temperature higher than the melting point of the heat-bonding component and lower than the shrinkage start temperature of the heat-shrinking component, thereby functioning to bond the fiber layers together, Further, by heat-treating at a temperature higher than the contraction start temperature of the heat-shrinking component, the first fiber layer is heat-shrunk, whereby many wrinkle-shaped irregularities are formed on the second fiber layer.
【００２８】第二繊維層はそれ自身殆ど熱収縮性を示さ
ないため、第一繊維層が収縮すると余剰面積が生じる。
そして、この余剰面積が凸状部を形成することになる。
つまり第二繊維層は、専ら皺状の凹凸部が発現する層で
あり、不織布全体の嵩および比容積の増加に直接寄与す
るのである。Since the second fiber layer itself exhibits almost no heat shrinkability, when the first fiber layer shrinks, an excess area is produced.
Then, this surplus area forms a convex portion.
That is, the second fiber layer is a layer in which wrinkle-like irregularities are exclusively developed and directly contributes to an increase in the bulk and specific volume of the nonwoven fabric.
【００２９】[0029]
【実施例】以下、本発明を実施例を具体的に挙げて説明
するが、もとより本発明はこの実施例に限定されるもの
ではない。EXAMPLES The present invention will be described below with reference to specific examples, but the present invention is not limited to these examples.
【００３０】［実施例１〜６、比較例１〜４］熱収縮性
繊維、熱接着性繊維およびその他の繊維をそれぞれ表中
に示す割合で混合し、パラレルカードにより目付１０ｇ
／ｍ2 のウェブを作成し、これを第一繊維層とした。こ
こでは熱収縮性繊維としてエチレン−プロピレンランダ
ム共重合体のみからなる繊度２デニール、繊維長５１ｍ
ｍの繊維（表中、ＰＮＥと略す）を使用し、熱接着性繊
維としてエチレン−アクリル酸メチル共重合体を鞘成
分、ポリプロピレンを芯成分とする鞘／芯の比が１／１
である繊度２デニール、繊維長５１ｍｍの芯鞘型複合繊
維（表中、ＸＧと略す）を使用した。また、その他の繊
維として繊度１．５デニール、繊維長４５ｍｍのレーヨ
ンを使用した。[Examples 1 to 6 and Comparative Examples 1 to 4] Heat-shrinkable fibers, heat-adhesive fibers, and other fibers were mixed in the proportions shown in the table, and the weight per unit of 10 g was measured with a parallel card.
/ M 2 web was prepared and used as the first fiber layer. Here, as the heat-shrinkable fiber, the fineness is 2 denier and the fiber length is 51 m, which is made of only ethylene-propylene random copolymer.
m fiber (abbreviated as PNE in the table) is used, and the sheath / core ratio of the ethylene / methyl acrylate copolymer as the sheath component and polypropylene as the core component is 1/1 as the heat-bonding fiber.
A core-sheath type composite fiber (abbreviated as XG in the table) having a fineness of 2 denier and a fiber length of 51 mm was used. As other fibers, rayon having a fineness of 1.5 denier and a fiber length of 45 mm was used.
【００３１】第二繊維層として、ポリエチレン（Ｐ
Ｅ）を鞘成分、ポリプロピレン（ＰＰ）を芯成分とする
繊度２デニール、繊維長５１ｍｍの複合繊維をパラレル
カードによりウェブとなした後、熱ロールで熱接着した
熱接着不織布、ポリエステル（ＰＥＴ）からなるスパ
ンボンド不織布、ポリプロピレン（ＰＰ）からなるス
パンボンド不織布の３種類の不織布を用意した。As the second fiber layer, polyethylene (P
E) is a sheath component, polypropylene (PP) is a core component, the fineness is 2 denier, and a composite fiber having a fiber length of 51 mm is made into a web by a parallel card and then heat-bonded with a heat roll. Three types of non-woven fabrics were prepared, a spun-bonded non-woven fabric made of polypropylene and a spun-bonded non-woven fabric made of polypropylene (PP).
【００３２】第一繊維層と第二繊維層を組み合わせ、そ
れぞれ表中の温度に加熱した熱ロール加工機を用いて線
圧３３ｋｇ／ｃｍで熱接着を行った後、熱風貫通型加工
機を用いて１３０℃で３０秒間熱処理を行うことにより
第一繊維層を熱収縮させ、第二繊維層に皺状の凹凸を形
成させた。第一繊維層と第二繊維層の組合せ、それぞれ
の熱接着温度、熱接着処理後および熱収縮処理後それぞ
れの不織布の厚み、比容積、第一繊維層と第二繊維層間
の剥離強力を表１および表２に示す。The first fiber layer and the second fiber layer were combined and heat-bonded at a linear pressure of 33 kg / cm using a heat roll processing machine heated to the temperature shown in the table, respectively, and then a hot air penetrating processing machine was used. The first fiber layer was heat-shrinked by heat treatment at 130 ° C. for 30 seconds to form wrinkle-shaped irregularities on the second fiber layer. Shows the combination of the first fiber layer and the second fiber layer, the respective heat-bonding temperature, the thickness of the nonwoven fabric after the heat-bonding treatment and the heat-shrinking treatment, the specific volume, and the peel strength between the first fiber layer and the second fiber layer. 1 and Table 2.
【００３３】[0033]
【表１】 [Table 1]
【００３４】[0034]
【表２】 [Table 2]
【００３５】［実施例７〜１５、比較例５〜１１］エチ
レン−プロピレンランダム共重合体を芯成分、エチレン
−アクリル酸メチル共重合体を鞘成分とする複合比１／
１の繊度２デニール、繊維長５１ｍｍの芯鞘型複合繊維
（表中、ＥＧと略す）とその他の繊維を表中に示す割合
で混合した後、パラレルカードにより目付１０ｇ／ｍ2
のウェブを作成し、これを第一繊維層とした。ここでは
その他の繊維として繊度１．５デニール、繊維長４５ｍ
ｍのレーヨンを使用した。[Examples 7 to 15 and Comparative Examples 5 to 11] A composite ratio 1 / using ethylene-propylene random copolymer as the core component and ethylene-methyl acrylate copolymer as the sheath component.
A core-sheath type composite fiber (abbreviated as EG in the table) having a fineness of 1 and a denier of 51 mm and a fiber length of 51 mm was mixed with other fibers at a ratio shown in the table, and then a basis weight of 10 g / m 2 was measured by a parallel card.
The web was prepared and used as the first fiber layer. Here, the other fibers have a fineness of 1.5 denier and a fiber length of 45 m.
m rayon was used.
【００３６】そして実施例１〜６および比較例１〜４に
おいて使用した熱接着不織布、ポリエステルスパンボン
ド不織布、ポリプロピレンスパンボンド不織布を第二繊
維層とした。The heat-bonded nonwoven fabric, polyester spunbonded nonwoven fabric, and polypropylene spunbonded nonwoven fabric used in Examples 1 to 6 and Comparative Examples 1 to 4 were used as the second fiber layer.
【００３７】この第一繊維層と第二繊維層を組み合わ
せ、それぞれ表中の温度に加熱した熱ロール加工機を用
いて線圧３３ｋｇ／ｃｍで熱接着を行った後、熱風貫通
型加工機を用いて１３０℃で３０秒間熱処理を行うこと
により第一繊維層を熱収縮させ、第二繊維層に皺状の凹
凸を形成させた。第一繊維層と第二繊維層の組合せ、そ
れぞれの熱接着温度、熱接着処理後および熱収縮処理後
それぞれの不織布の厚み、比容積、第一繊維層と第二繊
維層間の剥離強力を表３、表４および表５に示す。The first fiber layer and the second fiber layer were combined and heat-bonded at a linear pressure of 33 kg / cm using a hot roll processing machine heated to the temperature shown in the table, respectively, and then a hot air penetrating processing machine was used. The first fiber layer was heat-shrinked by using it for 30 seconds at 130 ° C. to form wrinkle-shaped irregularities on the second fiber layer. Shows the combination of the first fiber layer and the second fiber layer, the respective heat-bonding temperature, the thickness of the nonwoven fabric after the heat-bonding treatment and the heat-shrinking treatment, the specific volume, and the peel strength between the first fiber layer and the second fiber layer. 3, shown in Table 4 and Table 5.
【００３８】[0038]
【表３】 [Table 3]
【００３９】[0039]
【表４】 [Table 4]
【００４０】[0040]
【表５】 [Table 5]
【００４１】ここで、比較例５〜７については、両繊維
層間の接着が弱すぎたため最終的に両繊維層が一体化し
た不織布を得ることができず、比較例８〜１０について
は熱接着時に第一繊維層中の熱収縮成分の熱収縮が開始
し、均一に熱接着させることができず、以後の熱収縮処
理を行うことができなかった。Here, in Comparative Examples 5 to 7, a non-woven fabric in which both fiber layers were integrated could not be finally obtained because the adhesion between both fiber layers was too weak, and in Comparative Examples 8 to 10, thermal bonding was performed. At the same time, the heat shrinkage of the heat shrinkage component in the first fiber layer started, and uniform heat adhesion could not be achieved, and the subsequent heat shrinkage treatment could not be performed.
【００４２】併せてここで実施例１、実施例３および実
施例７の不織布の表面を３倍に拡大した写真を図３、図
４、図５として示しておく。At the same time, photographs of the surfaces of the nonwoven fabrics of Examples 1, 3 and 7 magnified three times are shown in FIGS. 3, 4 and 5.
【００４３】[0043]
【発明の効果】本発明は、熱収縮性繊維と熱接着性繊
維、もしくは熱接着成分を鞘成分とする熱収縮性複合繊
維を含む第一繊維層と、熱収縮性繊維もしくは熱収縮成
分が収縮する温度では本質的に収縮しない第二繊維層を
積層し、両繊維層間を第一繊維層の熱接着成分によって
一体化した後、さらに熱処理を施して第一繊維層を収縮
させて第二繊維層に多数の皺状の凹凸を形成させたもの
である。本発明の第一の特徴は、第一繊維層に熱接着成
分を含むため熱処理によって両繊維層間が接合されると
いう点にある。従って、スパンボンド不織布やメルトブ
ロー不織布等、様々な種類の繊維層を第二繊維層として
使用することができ、様々な用途への汎用を可能にしう
る。INDUSTRIAL APPLICABILITY According to the present invention, a heat shrinkable fiber and a heat adhesive fiber, or a first fiber layer containing a heat shrinkable composite fiber having a heat adhesive component as a sheath component, and a heat shrinkable fiber or a heat shrinkable component are used. A second fiber layer that does not essentially shrink at the shrinking temperature is laminated, and both fiber layers are integrated by the heat-adhesive component of the first fiber layer, and then further heat treated to shrink the first fiber layer and shrink the second fiber layer. A large number of wrinkle-shaped irregularities are formed on the fiber layer. The first feature of the present invention resides in that both fiber layers are joined by heat treatment because the first fiber layer contains a thermal adhesive component. Therefore, various types of fiber layers such as spunbonded nonwoven fabrics and meltblown nonwoven fabrics can be used as the second fiber layer, and can be used for various purposes.
【００４４】本発明のもう一つの特徴は、第一繊維層の
収縮によって第二繊維層に多数の皺状の凹凸が形成され
ることである。この凹凸は、第一繊維層の収縮により生
じた第二繊維層の剥離部が凸部を形成することによって
得られるので、自然な感じの皺状模様を呈し、従前の多
皺性不織布に比べて極めて優れた意匠効果を与えるもの
となる。Another feature of the present invention is that a large number of wrinkle-like irregularities are formed in the second fiber layer by contraction of the first fiber layer. This unevenness is obtained by forming a convex portion in the peeled portion of the second fiber layer caused by the contraction of the first fiber layer, and thus exhibits a wrinkle-like pattern with a natural feel, compared to the conventional multi-wrinkled nonwoven fabric. And gives an extremely excellent design effect.
【００４５】よって、本発明の多皺性不織布は様々な分
野において利用することができ、例えば、包装材、イン
テリア内装材、車両用内装材等への応用が可能である。Therefore, the multi-wrinkled nonwoven fabric of the present invention can be used in various fields, and can be applied to, for example, packaging materials, interior interior materials, interior materials for vehicles, and the like.
【図１】本発明の不織布の平面図である。FIG. 1 is a plan view of a nonwoven fabric of the present invention.
【図２】本発明の不織布の断面図である。FIG. 2 is a cross-sectional view of the nonwoven fabric of the present invention.
【図３】本発明の不織布の一例の表面状態を撮影した顕
微鏡写真である。FIG. 3 is a micrograph of a surface state of an example of the nonwoven fabric of the present invention.
【図４】本発明の不織布の一例の表面状態を撮影した顕
微鏡写真である。FIG. 4 is a micrograph of a surface state of an example of the nonwoven fabric of the present invention.
【図５】本発明の不織布の一例の表面状態を撮影した顕
微鏡写真である。FIG. 5 is a micrograph showing a surface state of an example of the nonwoven fabric of the present invention.
１ 多皺性不織布 ２ 第一繊維層 ３ 第二繊維層 ４ 凸部 ５ 凹部 1 Wrinkled non-woven fabric 2 First fiber layer 3 Second fiber layer 4 convex 5 recess
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−141167（ＪＰ，Ａ) 特開 昭52−25175（ＪＰ，Ａ) 特開 昭52−91970（ＪＰ，Ａ) 特開 平１−201569（ＪＰ，Ａ) 特開 平５−44108（ＪＰ，Ａ) 特公 昭49−10309（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) D04H 1/00 - 18/00 B32B 1/00 - 35/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-62-141167 (JP, A) JP-A-52-25175 (JP, A) JP-A-52-91970 (JP, A) JP-A-1- 201569 (JP, A) JP-A-5-44108 (JP, A) JP-B-49-10309 (JP, B1) (58) Fields investigated (Int.Cl. 7 , DB name) D04H 1/00-18 / 00 B32B 1/00-35/00
Claims (5)
ｍ＜１４５のエチレン−プロピレンランダム共重合体を
７０重量％以上含むポリマーからなる最大熱収縮率が少
なくとも５０％である熱収縮性繊維を３０〜７０重量
％、融点が前記熱収縮性繊維の収縮開始温度よりも低い
ポリマーからなる熱接着性繊維を３０重量％以上含んで
なる第一繊維層の片面もしくは両面に、前記熱収縮性繊
維が収縮する温度では本質的に熱収縮しない第二繊維層
が積層されてなる不織布であって、第一繊維層が熱処理
により収縮し、かつ第二繊維層に多数の皺状の凹凸部が
形成されており、第一繊維層と第二繊維層は凹凸部の凹
部において熱接着性繊維により接合されてなることを特
徴とする多皺性不織布。1. The melting peak temperature (Tm ° C.) is 130 <T.
30 to 70% by weight of a heat-shrinkable fiber having a maximum heat shrinkage of at least 50%, which is composed of a polymer containing 70% by weight or more of an ethylene-propylene random copolymer with m <145, and has a melting point of the heat-shrinkable fiber. On one or both sides of a first fiber layer containing 30% by weight or more of a heat-adhesive fiber made of a polymer having a temperature lower than the starting temperature, a second fiber layer which does not essentially heat-shrink at the temperature at which the heat-shrinkable fiber shrinks. In which the first fiber layer shrinks due to heat treatment, and a large number of wrinkle-shaped irregularities are formed in the second fiber layer, and the first fiber layer and the second fiber layer have irregularities. A multi-wrinkled non-woven fabric, characterized in that it is joined by a heat-adhesive fiber in the concave portion of the part.
ｍ＜１４５のエチレン−プロピレンランダム共重合体を
７０重量％以上含むポリマーからなる最大熱収縮率が少
なくとも５０％である熱収縮性繊維を３０〜７０重量
％、融点が前記熱収縮性繊維の収縮開始温度よりも低い
ポリマーからなる熱接着性繊維を７０〜３０重量％含ん
でなる第一繊維層の片面もしくは両面に、前記熱収縮性
繊維が収縮する温度では本質的に熱収縮しない第二繊維
層が積層されてなる不織布であって、第一繊維層が熱処
理により収縮し、かつ第二繊維層に多数の皺状の凹凸部
が形成されており、第一繊維層と第二繊維層は凹凸部の
凹部において熱接着性繊維により接合されてなることを
特徴とする多皺性不織布。2. The melting peak temperature (Tm ° C.) is 130 <T.
30 to 70% by weight of a heat-shrinkable fiber having a maximum heat shrinkage of at least 50%, which is composed of a polymer containing 70% by weight or more of an ethylene-propylene random copolymer with m <145, and has a melting point of the heat-shrinkable fiber. A second fiber that does not essentially heat-shrink at a temperature at which the heat-shrinkable fiber shrinks on one or both sides of a first fiber layer that contains 70 to 30% by weight of a heat-bondable fiber made of a polymer having a temperature lower than the starting temperature. A nonwoven fabric in which layers are laminated, the first fiber layer shrinks by heat treatment, and a large number of wrinkle-shaped irregularities are formed in the second fiber layer, and the first fiber layer and the second fiber layer are A wrinkled non-woven fabric, characterized in that it is joined with thermal adhesive fibers in the concave portions of the irregularities.
ｍ＜１４５のエチレン−プロピレンランダム共重合体を
７０重量％以上含むポリマーを芯成分、融点が前記芯成
分の収縮開始温度よりも低いポリマーを鞘成分とした熱
収縮性複合繊維を５０重量％以上含んでなる第一繊維層
の片面もしくは両面に、前記芯成分が収縮する温度では
本質的に熱収縮しない第二繊維層が積層されてなる不織
布であって、第一繊維層が熱処理により収縮し、かつ第
二繊維層に多数の皺状の凹凸が形成されており、第一繊
維層と第二繊維層は凹凸部の凹部において熱収縮性複合
繊維の鞘成分により接合されてなることを特徴とする多
皺性不織布。3. The melting peak temperature (Tm ° C.) is 130 <T.
50% by weight or more of a heat-shrinkable conjugate fiber whose core component is a polymer containing 70% by weight or more of an ethylene-propylene random copolymer with m <145 and whose sheath component is a polymer whose melting point is lower than the shrinkage initiation temperature of the core component. A nonwoven fabric comprising a first fiber layer comprising a second fiber layer laminated on one or both sides of the first fiber layer, the second fiber layer essentially not shrinking at a temperature at which the core component shrinks, and the first fiber layer shrinks by heat treatment. In addition, a large number of wrinkle-shaped irregularities are formed in the second fiber layer, and the first fiber layer and the second fiber layer are joined by the sheath component of the heat-shrinkable composite fiber in the concave portions of the irregularities. Wrinkled non-woven fabric.
ｍ＜１４５のエチレン−プロピレンランダム共重合体を
７０重量％以上含むポリマーからなる最大熱収縮率が少
なくとも５０％である熱収縮性繊維を３０〜７０重量
％、融点が熱収縮性繊維の収縮開始温度よりも低いポリ
マーからなる熱接着性繊維を３０重量％以上含んでなる
第一繊維層の片面もしくは両面に、前記熱収縮性繊維が
収縮する温度では本質的に熱収縮しない第二繊維層を積
層し、この積層体に熱接着性繊維の融点よりも高くかつ
熱収縮性繊維の収縮開始温度よりも低い温度で熱処理を
施して第一繊維層中の熱接着性繊維により積層体を一体
化した後、さらに１００＜Ｔ≦Ｔｍ＋３０の温度（Ｔ
℃）で熱処理を施して第一繊維層を収縮させることによ
り、第二繊維層に多数の皺状の凹凸を形成させることを
特徴とする多皺性不織布の製造方法。4. The melting peak temperature (Tm ° C.) is 130 <T.
30 to 70% by weight of heat-shrinkable fiber having a maximum heat shrinkage rate of at least 50% and comprising a polymer containing 70% by weight or more of ethylene-propylene random copolymer with m <145, and the melting point of the heat-shrinkable fiber starts to shrink. On one side or both sides of the first fiber layer containing 30% by weight or more of the heat-adhesive fiber made of a polymer whose temperature is lower than the temperature, a second fiber layer that does not essentially heat-shrink at the temperature at which the heat-shrinkable fiber shrinks is provided. The layers are laminated and heat-treated at a temperature higher than the melting point of the heat-adhesive fibers and lower than the contraction start temperature of the heat-shrinkable fibers to integrate the laminate with the heat-adhesive fibers in the first fiber layer. Then, the temperature of 100 <T ≦ Tm + 30 (T
A method for producing a multi-wrinkle nonwoven fabric, characterized in that a large number of wrinkle-like irregularities are formed in the second fiber layer by heat-treating the first fiber layer at (° C).
ｍ＜１４５のエチレン−プロピレンランダム共重合体を
７０重量％以上含むポリマーを芯成分、融点が前記芯成
分の収縮開始温度よりも低いポリマーを鞘成分とした熱
収縮性複合繊維を５０重量％以上含んでなる第一繊維層
の片面もしくは両面に、前記芯成分が収縮する温度では
本質的に熱収縮しない第二繊維層を積層し、この積層体
に熱収縮性複合繊維の鞘成分の融点よりも高くかつ芯成
分の収縮開始温度よりも低い温度で熱処理を施して熱収
縮性複合繊維の鞘成分により積層体を一体化した後、さ
らに１００＜Ｔ≦Ｔｍ＋３０の温度（Ｔ℃）で熱処理を
施して第一繊維層を収縮させることにより、第二繊維層
に多数の皺状の凹凸を形成させることを特徴とする多皺
性不織布の製造方法。5. The melting peak temperature (Tm ° C.) is 130 <T.
50% by weight or more of a heat-shrinkable conjugate fiber whose core component is a polymer containing 70% by weight or more of an ethylene-propylene random copolymer with m <145 and whose sheath component is a polymer whose melting point is lower than the shrinkage initiation temperature of the core component. On one side or both sides of the first fiber layer comprising, a second fiber layer that is essentially not heat-shrinkable at a temperature at which the core component shrinks is laminated, and the laminate has a melting point of the sheath component of the heat-shrinkable composite fiber After the heat treatment is performed at a temperature higher than that of the core component and lower than the shrinkage initiation temperature of the core component to integrate the laminate with the sheath component of the heat-shrinkable composite fiber, heat treatment is further performed at a temperature of 100 <T ≦ Tm + 30 (T ° C.). A method for producing a multi-wrinkled non-woven fabric, characterized in that a large number of wrinkle-shaped irregularities are formed on the second fiber layer by shrinking the first fiber layer by applying it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15291594A JP3429859B2 (en) | 1994-06-10 | 1994-06-10 | Wrinkled nonwoven fabric |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15291594A JP3429859B2 (en) | 1994-06-10 | 1994-06-10 | Wrinkled nonwoven fabric |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH083850A JPH083850A (en) | 1996-01-09 |
| JP3429859B2 true JP3429859B2 (en) | 2003-07-28 |
Family
ID=15550933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15291594A Expired - Lifetime JP3429859B2 (en) | 1994-06-10 | 1994-06-10 | Wrinkled nonwoven fabric |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3429859B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009510278A (en) * | 2005-10-03 | 2009-03-12 | ファイバービジョンズ・デラウェア・コーポレーション | Nonwoven fabric, articles made of nonwoven fabric, and method for producing nonwoven fabric |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998010130A1 (en) * | 1996-09-06 | 1998-03-12 | Chisso Corporation | Laminated nonwoven fabric and method of manufacturing same |
| JP3617637B2 (en) * | 2000-09-22 | 2005-02-09 | 花王株式会社 | Top sheet for absorbent articles |
| CN100360104C (en) | 2000-09-22 | 2008-01-09 | 花王株式会社 | Surface sheet for absorptive article |
| JP3609361B2 (en) | 2000-10-12 | 2005-01-12 | 花王株式会社 | Three-dimensional sheet material |
| DE60225383T2 (en) | 2001-08-10 | 2008-06-12 | Kao Corp. | Upper layer for absorbent article |
| JP3611838B2 (en) | 2001-12-28 | 2005-01-19 | 花王株式会社 | Top sheet for absorbent articles |
| JP3625804B2 (en) * | 2002-02-25 | 2005-03-02 | 花王株式会社 | Three-dimensional sheet material |
| JP3883460B2 (en) * | 2002-03-25 | 2007-02-21 | 花王株式会社 | 3D sheet |
| JP2014105409A (en) * | 2012-11-28 | 2014-06-09 | Nitto Boseki Co Ltd | Method for producing cloth |
| JP5752775B2 (en) * | 2013-03-04 | 2015-07-22 | 株式会社ｆｉｎｅｔｒａｃｋ | Long fiber nonwoven fabric and laminated fabric having the long fiber nonwoven fabric |
| WO2021226049A1 (en) * | 2020-05-04 | 2021-11-11 | Hollingsworth & Vose Company | Filter media with irregular structure and/or reversibly stretchable layers |
-
1994
- 1994-06-10 JP JP15291594A patent/JP3429859B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009510278A (en) * | 2005-10-03 | 2009-03-12 | ファイバービジョンズ・デラウェア・コーポレーション | Nonwoven fabric, articles made of nonwoven fabric, and method for producing nonwoven fabric |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH083850A (en) | 1996-01-09 |
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