JP2005187954A - Highly stretchable nonwoven fabric having clear embossing pattern formed therein and method for producing the same - Google Patents
Highly stretchable nonwoven fabric having clear embossing pattern formed therein and method for producing the same Download PDFInfo
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Abstract
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本発明はエンボス加工が施された高伸縮性不織布に関し、詳細には、鮮明なエンボス模様（凹部）が施された高伸縮性不織布、及びその製造方法に関する。 The present invention relates to a highly stretchable nonwoven fabric that has been embossed, and more particularly to a highly stretchable nonwoven fabric that has a clear embossed pattern (concave portion) and a method for producing the same.
従来から湿布などのパップ剤の基材には不織布が用いられている。パップ剤は肩や背中などの様に不織布の伸縮性がさほど要求されない部位に貼付されるだけでなく、肘や膝などの様に不織布に高い伸縮性が要求される部位にも貼付される。近年、肘や膝などの関節部分に貼付した際の追従性を高めるために、伸縮性不織布が基材として用いられている。この様な不織布の伸縮性は、熱収縮率の異なる熱可塑性弾性樹脂を組み合せた偏心芯鞘型繊維、あるいはサイドバイサイド型繊維などの繊維の有する伸長・回復性を利用していた。 Conventionally, non-woven fabrics have been used as base materials for poultices such as poultices. The poultice is not only applied to a portion where the stretchability of the nonwoven fabric is not so required, such as the shoulder or the back, but is also applied to a portion where high stretchability is required of the nonwoven fabric, such as an elbow or a knee. In recent years, a stretchable nonwoven fabric has been used as a base material in order to improve followability when applied to joints such as elbows and knees. The stretchability of such a nonwoven fabric utilizes the stretchability / recoverability of fibers such as an eccentric core-sheath fiber or a side-by-side fiber combined with thermoplastic elastic resins having different heat shrinkage rates.
ところで、こうしたパップ剤等の外用薬貼付剤の基材にインク等によって印刷を施した場合、使用薬剤の滲みによって印字が不鮮明になることから、通常は印刷されていない。そのため包装材からパップ剤を取出した後は、製造元や製品名が不明となってしまうのが現状である。こうした現状に鑑み、不織布に任意の文字や模様を付与する技術が提案されている。例えば、不織布にエンボス加工を施す際に、不織布の凹部の繊維交絡部を融着させない技術等が提案されている（特許文献１、特許文献２、特許文献３）。
従来から不織布にエンボス加工を施すことは試みられているが、不織布に形成されたエンボス模様の鮮明度が不十分であり、また摩擦によって簡単にエンボス模様がぼやけてしまうという問題があるため、実用性を有するエンボス加工された不織布が求められていた。本発明はこの様な問題に鑑みてなされたものであって、その目的は鮮明なエンボス模様が施された伸縮性不織布、及びその製造方法を提供することである。 Attempts have been made to emboss non-woven fabrics from the past, but the embossed pattern formed on the non-woven fabric is not clear enough, and there is a problem that the embossed pattern is easily blurred by friction. There has been a need for an embossed nonwoven fabric having properties. This invention is made | formed in view of such a problem, The objective is to provide the elastic nonwoven fabric in which the clear embossed pattern was given, and its manufacturing method.
本発明は、エンボス加工が施された伸縮性不織布であって、該不織布は少なくとも溶融開始温度の異なる捲縮性複合繊維が交絡してなると共に、該不織布のエンボス凹部の繊維交絡部が融着していないことに要旨を有する伸縮性不織布である。 The present invention is an elastic nonwoven fabric embossed, wherein the nonwoven fabric is entangled with at least crimped conjugate fibers having different melting start temperatures, and the fiber entangled portion of the embossed recess of the nonwoven fabric is fused. It is a stretchable nonwoven fabric having a gist in that it is not.
本発明では前記不織布が、前記捲縮性複合繊維と非捲縮性繊維が交絡してなるものであってもよい。 In the present invention, the nonwoven fabric may be one in which the crimped conjugate fiber and the non-crimped fiber are entangled.
この際、前記不織布における非捲縮性繊維の割合（質量％）が６０％以下（０％を含まない）であることが望ましい。 At this time, the ratio (mass%) of non-crimpable fibers in the nonwoven fabric is desirably 60% or less (not including 0%).
本発明の捲縮性複合繊維は、融点の異なる熱溶融性樹脂を組み合せてなるサイドバイサイド型繊維、および／または偏心芯鞘型繊維であることが推奨される。 It is recommended that the crimped conjugate fiber of the present invention is a side-by-side type fiber and / or an eccentric core-sheath type fiber formed by combining heat-meltable resins having different melting points.
また前記伸縮性不織布は、溶融開始温度の高い高融点複合繊維Ａと溶融開始温度の低い低融点複合繊維Ｂが交絡したものであって、前記高融点複合繊維Ａは、高融点ポリエステル樹脂と低融点ポリエステル樹脂からなり、前記低融点複合繊維Ｂは、前記高融点ポリエステル樹脂と融点が同一または異なる高融点ポリエステル樹脂と前記低融点ポリエステル樹脂の融点よりも３℃以上低い融点の低融点ポリエステル樹脂からなるものであることが推奨される。 The stretchable nonwoven fabric is entangled with a high melting point composite fiber A having a high melting start temperature and a low melting point composite fiber B having a low melting start temperature, and the high melting point composite fiber A has a high melting point polyester resin and a low melting point. The low-melting point composite fiber B includes a high-melting point polyester resin having a melting point that is the same as or different from that of the high-melting point polyester resin, and a low-melting point polyester resin having a melting point that is 3 ° C. lower than the melting point of the low-melting point polyester resin. It is recommended that
本発明の前記不織布の縦方向または横方向の５０％モジュラス強度は、６Ｎ／５ｃｍ以下であり、且つ該縦方向または横方向の５０％伸長回復率が２０％以上であることが望ましい。 The 50% modulus strength in the machine direction or the transverse direction of the nonwoven fabric of the present invention is preferably 6 N / 5 cm or less, and the 50% elongation recovery rate in the machine direction or the transverse direction is preferably 20% or more.
本発明の不織布は、前記高融点複合繊維Ａと低融点複合繊維Ｂの割合が１０：９０〜９０：１０であることが好ましい。 In the nonwoven fabric of the present invention, the ratio of the high-melting conjugate fiber A and the low-melting conjugate fiber B is preferably 10:90 to 90:10.
本発明の伸縮性不織布は、エンボス加工されていない面に外用薬が直接的または間接的に付着させて、伸縮性パップ剤として用いることができる。 The stretchable nonwoven fabric of the present invention can be used as a stretchable poultice with an external drug directly or indirectly attached to a non-embossed surface.
また本発明は、エンボス加工が施された伸縮性不織布の製造方法であって、融点の異なる捲縮性複合繊維が交絡してなる不織布に、該繊維が融着しない温度でエンボス加工を施すことに要旨を有する。 The present invention also relates to a method for producing an embossed stretchable nonwoven fabric, wherein the nonwoven fabric formed by entanglement of crimpable composite fibers having different melting points is embossed at a temperature at which the fibers are not fused. Has a summary.
本発明によれば、鮮明なエンボス模様が施された伸縮性不織布が提供できる。即ち、少なくとも溶融開始温度の異なる捲縮性複合繊維が交絡している本発明の不織布は、溶融開始温度が同じ捲縮性複合繊維のみを交絡させた不織布よりも、凹部の繊維同士の密着性が高く、エンボス模様の鮮明度に優れている。また本発明の不織布はエンボス模様の耐久性や、伸縮後のエンボス模様の耐変形性にも優れている。しかも本発明の不織布は凹部の繊維の交絡部が融着していないため、伸長性にも優れた特性を示す。 According to the present invention, a stretchable nonwoven fabric provided with a clear embossed pattern can be provided. That is, the nonwoven fabric of the present invention in which at least the crimpable conjugate fibers having different melting start temperatures are entangled with each other is more adhesive than the nonwoven fabric in which only the crimpable conjugate fibers having the same melting start temperature are entangled. The embossed pattern is very clear. Moreover, the nonwoven fabric of this invention is excellent also in the durability of an embossed pattern, and the deformation resistance of the embossed pattern after expansion / contraction. And since the entanglement part of the fiber of a recessed part is not melt | fusion, the nonwoven fabric of this invention shows the characteristic excellent also in the extendibility.
本発明者は伸縮性に優れ、且つエンボス模様の鮮明度にも優れた不織布について鋭意研究を重ねた結果、少なくとも溶融開始温度の異なる捲縮性複合繊維によって不織布を構成すると共に（非捲縮性繊維を含んでいてもよい）、エンボス加工によってエンボスロール凸部に対応した不織布の凹部の繊維を融着させずに圧密化すれば、捲縮性複合繊維の収縮挙動の差によって繊維同士の密着性が高まり、エンボス模様の鮮明度が向上すると共に、伸縮性にも優れた特性を示すことを見出し、本発明に至った。 As a result of intensive research on nonwoven fabrics having excellent stretchability and excellent embossed pattern, the present inventor constituted at least nonwoven fabrics with crimped conjugate fibers having different melting start temperatures (non-crimpability). If the fibers in the concave portions of the nonwoven fabric corresponding to the convex portions of the embossing roll are consolidated without embedding by embossing, the fibers adhere to each other due to the difference in the shrinkage behavior of the crimpable composite fibers. As a result, the present inventors have found that the embossed pattern has improved sharpness and improved elasticity, and has excellent stretch properties.
本発明のエンボス加工が施された伸縮性不織布は、少なくとも溶融開始温度の異なる捲縮性複合繊維が交絡してなると共に、該不織布のエンボス凹部の繊維交絡部が融着していないことに要旨を有する。 The stretchable nonwoven fabric subjected to the embossing process of the present invention is formed by entanglement of at least crimped conjugate fibers having different melting start temperatures, and the fiber entangled portions of the embossed recesses of the nonwoven fabric are not fused. Have
本発明の不織布は、少なくとも溶融開始温度の異なる捲縮性複合繊維を含んでいる。溶融開始温度の異なる捲縮性複合繊維とは、複合繊維を構成する融点の低い熱可塑性樹脂（以下、低融点樹脂という）の融点が異なる繊維をいう。即ち、本発明の不織布には、少なくとも溶融開始温度の高い複合繊維（高融点複合繊維Ａ）と、溶融開始温度の低い複合繊維（低融点複合繊維Ｂ）が含まれている。そして高融点複合繊維Ａは、融点の高い熱可塑性樹脂ｃ（以下、高融点樹脂という）と低融点樹脂ｄからなる。また低融点複合繊維Ｂは該高融点樹脂ｃと融点が同一または異なる高融点樹脂ｃ’と該低融点樹脂ｄよりも融点が低い低融点樹脂ｄ’とからなる。１種類の捲縮性複合繊維のみを交絡させてなる不織布では、エンボス加工を施した際の凹部の繊維の密着性が低いため、鮮明なエンボス模様を形成することが難しい。 The nonwoven fabric of the present invention includes at least crimped conjugate fibers having different melting start temperatures. The crimpable conjugate fibers having different melting start temperatures refer to fibers having different melting points of a thermoplastic resin having a low melting point (hereinafter referred to as a low melting point resin) constituting the conjugate fiber. That is, the nonwoven fabric of the present invention contains at least a composite fiber having a high melting start temperature (high melting point composite fiber A) and a composite fiber having a low melting start temperature (low melting point composite fiber B). The high melting point composite fiber A is composed of a thermoplastic resin c having a high melting point (hereinafter referred to as a high melting point resin) and a low melting point resin d. The low melting point composite fiber B includes a high melting point resin c 'having the same or different melting point as the high melting point resin c and a low melting point resin d' having a lower melting point than the low melting point resin d. In a non-woven fabric obtained by entanglement with only one type of crimped conjugate fiber, it is difficult to form a clear embossed pattern because the adhesiveness of the fibers in the recesses is low when embossing is performed.
尚、エンボス加工による凹部の鮮明度を高める観点からは、少なくとも溶融開始温度の異なる捲縮性複合繊維が交絡していればよく、不織布には単一成分からなる繊維等、クリンプによる伸縮作用を有さない非捲縮性繊維を含ませることも可能である。したがって本発明の不織布は、例えば高融点複合繊維Ａ、低融点複合繊維Ｂ、及び非捲縮性繊維を交絡させたものであってもよい。但し、非捲縮性繊維の割合が高くなり過ぎると、上記溶融開始温度の異なる捲縮性複合繊維を用いることによって得られる凹部の鮮明度向上効果が十分得られないことがあるので、非捲縮性繊維の割合（質量％）は（非捲縮性繊維と捲縮性複合繊維を交絡させてなる不織布中における非捲縮性繊維の占める割合）、６０％以下にすることが好ましい。より好ましくは５０％以下、更に好ましくは１０％以下である。尚、非捲縮性繊維の割合が低くすると、不織布の伸縮性が高くなることから、例えば不織布の５０％モジュラス強度を４Ｎ／５ｃｍ以下とする場合、非捲縮性繊維の割合は少ない方が好ましく、例えば１０％以下にすることが望ましく、捲縮性複合繊維のみ（非捲縮性繊維の割合が０％）で不織布を構成してもよい。 In addition, from the viewpoint of increasing the definition of the concave portion by embossing, it is sufficient that at least the crimpable composite fibers having different melting start temperatures are entangled, and the nonwoven fabric has a stretching action by crimping, such as a fiber composed of a single component. It is also possible to include non-crimped fibers that are not present. Therefore, the nonwoven fabric of the present invention may be, for example, entangled with the high melting point conjugate fiber A, the low melting point conjugate fiber B, and the non-crimpable fiber. However, if the proportion of non-crimpable fibers becomes too high, the effect of improving the sharpness of the recesses obtained by using the crimpable conjugate fibers having different melting start temperatures may not be sufficiently obtained. The proportion (% by mass) of the crimpable fiber (the proportion of the non-crimpable fiber in the nonwoven fabric obtained by entanglement of the non-crimpable fiber and the crimpable conjugate fiber) is preferably 60% or less. More preferably, it is 50% or less, More preferably, it is 10% or less. In addition, since the stretchability of a nonwoven fabric will become high if the ratio of a non-crimpable fiber becomes low, when the 50% modulus intensity | strength of a nonwoven fabric shall be 4 N / 5cm or less, the one where the ratio of a non-crimpable fiber is smaller is preferable. Preferably, for example, it is desirable to make it 10% or less, and the nonwoven fabric may be composed of only crimpable conjugate fibers (the proportion of non-crimpable fibers is 0%).
また本発明では、溶融開始温度が異なる捲縮性複合繊維を３種類以上交絡させた場合でも、２種類用いた不織布と同様の効果を発現するが、追加繊維分の工程が増えるため、製造コストが高くなる。したがって本発明では、高融点複合繊維Ａと低融点複合繊維Ｂを交絡させ、実質的にこの２種類の複合繊維によって不織布を構成することが望ましい。 Further, in the present invention, even when three or more types of crimped conjugate fibers having different melting start temperatures are entangled, the same effect as that of the two types of nonwoven fabric is exhibited, but the number of steps for the additional fibers increases, so the manufacturing cost Becomes higher. Therefore, in the present invention, it is desirable that the high-melting conjugate fiber A and the low-melting conjugate fiber B are entangled and the nonwoven fabric is substantially constituted by these two types of conjugate fibers.
高融点複合繊維Ａの低融点樹脂と低融点複合繊維Ｂの低融点樹脂の成分が異なっていても、融点差が少ないと、繊維の捲縮特性がほぼ同一になり、実質的に１種類の複合繊維で構成した場合と同様になってしまうため、凹部の繊維の密着性が不十分となり、高い鮮明度が得られ難い。したがって融点差は３℃以上であることが好ましく、より好ましくは５℃以上である。一方、融点差が大きくなり過ぎると、捲縮を発現させる際の熱処理温度の設定が難しく、不織布の安定した伸長性が得難くなる。したがって融点差は好ましくは２０℃以下、より好ましくは１５℃以下である。 Even if the components of the low melting point resin of the high melting point composite fiber A and the low melting point resin of the low melting point composite fiber B are different, if the difference in melting point is small, the crimp characteristics of the fibers are almost the same, Since it becomes the same as the case where it comprises with composite fiber, the adhesiveness of the fiber of a recessed part becomes inadequate, and it is difficult to obtain high definition. Therefore, the difference in melting point is preferably 3 ° C. or more, more preferably 5 ° C. or more. On the other hand, if the melting point difference is too large, it is difficult to set the heat treatment temperature when the crimp is developed, and it becomes difficult to obtain a stable stretchability of the nonwoven fabric. Accordingly, the melting point difference is preferably 20 ° C. or less, more preferably 15 ° C. or less.
尚、非捲縮性繊維を含む場合、非捲縮性繊維の溶融開始温度は特に限定されない。例えば非捲縮性繊維の融点は、繊維の融着を防ぐために捲縮性複合繊維の捲縮発現温度で溶融しない温度が好ましく、より好ましくは高融点複合繊維Ａの低融点樹脂の融点よりも高いことが望ましく、更に好ましくは、高融点樹脂の融点と同じか、若しくはそれよりも高いことが望ましい。 In addition, when a non-crimpable fiber is included, the melting start temperature of a non-crimpable fiber is not specifically limited. For example, the melting point of the non-crimped fiber is preferably a temperature that does not melt at the crimping expression temperature of the crimpable conjugate fiber in order to prevent fiber fusion, more preferably the melting point of the low-melting resin of the high-melting conjugate fiber A. It is desirable that it is high, and it is desirable that the melting point of the high melting point resin be the same as or higher than that.
高融点複合繊維Ａと低融点複合繊維Ｂの割合は特に限定されないが、一方の割合が少なすぎると、実質的に１種類の複合繊維で構成した場合と同じ程度の鮮明度しか得られないことから、高融点複合繊維Ａ：低融点複合繊維Ｂの割合（質量％）は好ましくは１０：９０〜９０：１０であり、より好ましくは８０：２０〜２０：８０である。 The ratio of the high-melting conjugate fiber A and the low-melting conjugate fiber B is not particularly limited, but if one of the proportions is too small, it is possible to obtain substantially the same sharpness as that of a single type of conjugate fiber. Therefore, the ratio (mass%) of the high melting point conjugate fiber A: the low melting point conjugate fiber B is preferably 10:90 to 90:10, more preferably 80:20 to 20:80.
伸縮性や凹部の鮮明度に偏りが生じるのを防ぐ観点から、不織布を構成する繊維は均一に混繊していることが望ましい。 From the viewpoint of preventing unevenness in the stretchability and the sharpness of the recesses, it is desirable that the fibers constituting the nonwoven fabric are uniformly mixed.
本発明の不織布にはエンボス模様（凹凸）が施されているが、エンボス凹部の繊維の交絡部は融着していない。「融着していない」とは、繊維の一部が溶けて他の繊維と一体化していないことを意味する。したがって不織布の凹部の繊維は他の部分よりも圧密化された状態となっているだけである。凹部の繊維が融着していないので、不織布を伸ばした際に、繊維交絡部が固定されておらず、自由度（可動性）があるので優れた伸縮性を示す。尚、凹部の繊維交絡部が融着していると、不織布を引張った際に交絡部が固定されているため、十分な伸びが得られず、また該融着部分の繊維が破断し易い。 Although the embossed pattern (unevenness | corrugation) is given to the nonwoven fabric of this invention, the entanglement part of the fiber of an embossing recessed part is not melt | fused. “Not fused” means that some of the fibers are melted and not integrated with other fibers. Therefore, the fibers in the concave portions of the nonwoven fabric are only in a more consolidated state than the other portions. Since the fibers in the concave portions are not fused, when the nonwoven fabric is stretched, the fiber entangled portion is not fixed and has flexibility (movability), and thus exhibits excellent stretchability. In addition, when the fiber entanglement part of a recessed part is fuse | melted, since the entanglement part is being fixed when the nonwoven fabric is pulled, sufficient elongation cannot be obtained and the fiber of the fusion part is easily broken.
不織布において凹部の占める面積率は特に限定されないが、凹部の繊維は圧密化された状態であるので凹部が形成されていない部分と比べると、繊維の自由度が低い。本発明の不織布は凹部面積率が例えば１０％以上であっても高い伸長性を有するが、凹部の面積率が高くなると不織布の伸長性が低下するので、凹部面積率は好ましくは４０％以下、より好ましくは３０％以下である。 Although the area ratio which a recessed part accounts in a nonwoven fabric is not specifically limited, Since the fiber of a recessed part is the compacted state, the freedom degree of a fiber is low compared with the part in which the recessed part is not formed. The nonwoven fabric of the present invention has high extensibility even when the recessed area ratio is, for example, 10% or more, but since the extensibility of the nonwoven fabric decreases when the recessed area ratio increases, the recessed area ratio is preferably 40% or less, More preferably, it is 30% or less.
尚、エンボス加工が施されている不織布とは、不織布表面に凹凸が存在することをいい、エンボス模様とは、不織布表面の凹凸差によって認識できる文字、図形、絵など任意の形状のものをいう。 The embossed non-woven fabric means that the surface of the non-woven fabric has irregularities, and the embossed pattern means any shape such as letters, figures, and pictures that can be recognized by the unevenness of the non-woven fabric surface. .
不織布の伸縮性とは、不織布両端に相反する方向に引張力を加えた際に大きく伸長すると共に、該引張力を解除すると、回復する性質をいう。 The stretchability of the nonwoven fabric refers to the property that when the tensile force is applied in the opposite direction to both ends of the nonwoven fabric, the nonwoven fabric stretches greatly and recovers when the tensile force is released.
本発明においてエンボス模様が形成されている不織布の伸長性は、用途に応じて適宜決定すればよいが、縦、又は横方向いずれかの５０％モジュラス強度が、好ましくは６Ｎ／５ｃｍ以下であれば、伸長容易性（小さな外力で伸ばすことができる）に優れたものとなるので望ましい。より好ましくは５Ｎ／５ｃｍ以下、更に好ましくは４Ｎ／５ｃｍ以下である。特に５０％モジュラス強度を４Ｎ／５ｃｍ以下とするには、不織布に含まれる非捲縮性繊維の割合が１０％以下であることが望ましく、より好ましくは０％とすることが望ましい。 In the present invention, the extensibility of the nonwoven fabric on which the embossed pattern is formed may be appropriately determined according to the use, but if the 50% modulus strength in either the vertical or horizontal direction is preferably 6 N / 5 cm or less. It is desirable because it is excellent in easiness of extension (it can be extended with a small external force). More preferably, it is 5 N / 5 cm or less, More preferably, it is 4 N / 5 cm or less. In particular, in order to set the 50% modulus strength to 4 N / 5 cm or less, the ratio of non-crimped fibers contained in the nonwoven fabric is desirably 10% or less, and more desirably 0%.
また用途によっては不織布の伸長後、できるだけ元のサイズに戻ることが望ましいので、５０％伸長回復率は２０％以上であることが好ましく、より好ましくは３０％以上、更に好ましくは４０％以上である。特に５０％伸長回復率を３０％以上とするには、不織布に含まれる非捲縮性繊維の割合が１０％以下であることが望ましく、より好ましくは０％とすることが望ましい。 Moreover, since it is desirable to return to the original size as much as possible after extending the nonwoven fabric depending on the application, the 50% elongation recovery rate is preferably 20% or more, more preferably 30% or more, and further preferably 40% or more. . In particular, in order to obtain a 50% elongation recovery rate of 30% or more, the ratio of non-crimpable fibers contained in the nonwoven fabric is desirably 10% or less, and more desirably 0%.
優れた伸縮性を有する不織布とするには、上記５０％モジュラス強度と５０％伸長回復率の双方を満足することが望ましい。 In order to obtain a nonwoven fabric having excellent stretchability, it is desirable to satisfy both the 50% modulus strength and the 50% elongation recovery rate.
本発明の不織布の目付量は特に限定されないが、目付が少なすぎると不織布を伸長した際に厚みが薄くなり隙間が生じることがある。一方、目付が大きすぎると捲縮による収縮力（回復力）が高くなりすぎて不織布を伸長するのに要する力が大きくなる。したがって不織布の目付量は、好ましくは５０〜２００ｇ／ｍ2とすることが推奨される。 The basis weight of the nonwoven fabric of the present invention is not particularly limited. However, if the basis weight is too small, the nonwoven fabric may be thinned to cause a gap when the nonwoven fabric is stretched. On the other hand, if the basis weight is too large, the shrinkage force (recovery force) due to crimping becomes too high, and the force required to stretch the nonwoven fabric increases. Therefore, it is recommended that the basis weight of the nonwoven fabric is preferably 50 to 200 g / m 2 .
不織布の密度は適宜調節すればよいが、低密度すぎると質感が悪くなる。一方、高密度すぎると捲縮による収縮力が高くなって伸長容易性が低下する。したがって不織布の密度は、好ましくは０．０５〜０．２ｇ／ｃｍ3であることが推奨される。 The density of the nonwoven fabric may be adjusted as appropriate, but if the density is too low, the texture becomes worse. On the other hand, if the density is too high, the contraction force due to crimping becomes high, and the easiness of extension decreases. Therefore, it is recommended that the density of the nonwoven fabric is preferably 0.05 to 0.2 g / cm 3 .
同様に不織布の厚さについても、薄くなり過ぎると質感が悪くなると共に、伸長時に隙間が生じやすくなる。一方、厚さが増すにつれて不織布の捲縮による収縮力が高くなって伸長容易性が低下する。したがって不織布の厚さは好ましくは０．３ｍｍ〜２．０ｍｍであることが推奨される。 Similarly, when the thickness of the nonwoven fabric is too thin, the texture is deteriorated and a gap is easily generated during elongation. On the other hand, as the thickness increases, the shrinkage force due to crimping of the nonwoven fabric increases and the easiness of stretching decreases. Therefore, it is recommended that the thickness of the non-woven fabric is preferably 0.3 mm to 2.0 mm.
本発明において捲縮性複合繊維とは、溶融開始温度の異なる２種類の樹脂を組み合せた複合繊維であって、且つ外力を加えると捲縮が伸長し、外力を除去すると捲縮が収縮する性質を有する繊維である。この様な捲縮性複合繊維は、複合繊維を構成する樹脂のうち一方が熱収縮し、他方が熱収縮しない温度で熱処理することによって、スパイラル状又はコイル状の捲縮性複合繊維が得られる。したがって捲縮性とは、繊維がスパイラル状又はコイル状のクリンプをなし、該クリンプによって伸縮作用（バネ作用）を発現する性質をいう。 In the present invention, the crimpable composite fiber is a composite fiber obtained by combining two types of resins having different melting start temperatures, and the crimp expands when an external force is applied, and the crimp contracts when the external force is removed. It is the fiber which has. In such a crimpable conjugate fiber, a spiral or coiled crimpable conjugate fiber can be obtained by heat treatment at a temperature at which one of the resins constituting the conjugate fiber is thermally contracted and the other is not thermally contracted. . Accordingly, the crimp property refers to the property that the fibers form a spiral or coiled crimp and the crimping action (spring action) is expressed by the crimp.
また本発明において複合繊維とは、融点の異なる熱可塑性樹脂を組み合せてなる繊維である。具体的には、高融点樹脂と該樹脂よりも融点の低い低融点樹脂からなる繊維をいう。尚、高融点樹脂と低融点樹脂の融点差が少ないと、低融点樹脂と高融点樹脂の捲縮発現温度での収縮差が近接するため、低融点樹脂の収縮力が低下して十分捲縮しないので、不織布の伸長性が不十分になることがある。したがって低融点樹脂と高融点樹脂の融点差は好ましくは１０℃以上、より好ましくは１５℃以上であることが望ましい。一方、高融点樹脂と低融点樹脂の融点差が大きくなり過ぎると、捲縮が細かくなるため、捲縮による収縮力が高くなり過ぎて伸長させる際に必要な力が大きくなり、伸縮性に劣ることがある。したがって低融点樹脂と高融点樹脂の融点差は好ましくは１００℃以下、より好ましくは９０℃以下とすることが望ましい。 In the present invention, the composite fiber is a fiber formed by combining thermoplastic resins having different melting points. Specifically, it refers to a fiber composed of a high melting point resin and a low melting point resin having a lower melting point than the resin. If the difference between the melting points of the high melting point resin and the low melting point resin is small, the shrinkage difference between the low melting point resin and the high melting point resin is close to the crimping temperature. Therefore, the extensibility of the nonwoven fabric may be insufficient. Therefore, the melting point difference between the low melting point resin and the high melting point resin is preferably 10 ° C. or higher, more preferably 15 ° C. or higher. On the other hand, if the melting point difference between the high melting point resin and the low melting point resin becomes too large, the crimp becomes fine, so the contraction force due to the crimp becomes too high, and the force required for extension becomes large, resulting in poor stretchability. Sometimes. Therefore, the difference in melting point between the low melting point resin and the high melting point resin is preferably 100 ° C. or less, more preferably 90 ° C. or less.
本発明の複合繊維の構成は、サイドバイサイド型、あるいは偏心芯鞘型であることが望ましい。サイドバイサイド型、偏心芯鞘型の複合繊維は、融点の低い樹脂が熱収縮してスパイラル状に捲縮するため、不織布に高い伸縮性を付与することができる。 The configuration of the composite fiber of the present invention is desirably a side-by-side type or an eccentric core-sheath type. Side-by-side type and eccentric core-sheath type composite fibers can impart high stretchability to the nonwoven fabric because the resin having a low melting point is thermally contracted and crimped in a spiral shape.
この様な複合繊維を構成する熱可塑性樹脂の種類は特に限定されず、例えばポリエステル系樹脂、ポリプロピレン系樹脂、ポリエチレン系樹脂、ポリアミド系樹脂などが挙げられ、融点の異なる任意の樹脂を組み合せればよい。十分な伸縮性を発現するうえで好ましい複合繊維は、ポリエステル／変性ポリエステル、ポリプロピレン／変性ポリプロピレン、ポリエステル／ポリアミド、ポリエステル／ポリエチレン、ポリプロピレン／ポリエチレンである。特にポリエステル（融点２５５〜２７０℃）／変性ポリエステル（融点２００〜２５０℃）の組み合わせは、従来の製造条件を大幅に変更することなく伸縮性とエンボス模様鮮明度に優れた不織布を製造できるので望ましい。 The kind of the thermoplastic resin that constitutes such a composite fiber is not particularly limited, and examples thereof include polyester resins, polypropylene resins, polyethylene resins, polyamide resins, and the like. Good. Preferred composite fibers for exhibiting sufficient stretchability are polyester / modified polyester, polypropylene / modified polypropylene, polyester / polyamide, polyester / polyethylene, and polypropylene / polyethylene. In particular, the combination of polyester (melting point: 255 to 270 ° C.) / Modified polyester (melting point: 200 to 250 ° C.) is desirable because a nonwoven fabric excellent in stretchability and embossed pattern definition can be produced without greatly changing the conventional production conditions. .
非捲縮性繊維としては、例えばポリエステル系樹脂、ポリプロピレン系樹脂、ポリエチレン系樹脂、ポリアミド系樹脂などの熱可塑性樹脂からなる化学繊維（単一成分による繊維）や、綿や羊毛などの天然繊維が例示され。１種またはこれらを任意に組み合せて本発明の不織布に含ませてもよい。 Examples of non-crimpable fibers include chemical fibers (single component fibers) made of a thermoplastic resin such as polyester resin, polypropylene resin, polyethylene resin, and polyamide resin, and natural fibers such as cotton and wool. Illustrated. One or a combination of these may be included in the nonwoven fabric of the present invention.
本発明では高融点複合繊維Ａと低融点複合繊維Ｂを構成する低融点樹脂の融点が異なっていればよいので、高融点複合繊維Ａの高融点樹脂と低融点複合繊維Ｂの高融点樹脂は同じ樹脂でよい。 In the present invention, since the melting points of the low melting point resin constituting the high melting point composite fiber A and the low melting point composite fiber B need only be different, the high melting point resin of the high melting point composite fiber A and the high melting point resin of the low melting point composite fiber B are The same resin may be used.
繊維の繊度については特に限定されず、用途に応じて適宜選択すればよいが、繊度を低くすると、不織布の緻密性は高くなるものの、繊維の耐破断性が低下するため耐久性が悪化する。一方、繊度を高くすると繊維の耐破断性は高くなるものの、不織布の緻密性が低下するため、不織布に付着させた外用薬が滲み出る恐れがある。したがって、製品として要求される不織布の緻密性と繊維の耐破断性を兼ね備えるには、例えば繊度を１．０〜１０デシテックスとすることが望ましい。繊維長さは特に限定されず、用途や要求性能に応じて適宜選択すればよい。 The fineness of the fiber is not particularly limited and may be appropriately selected depending on the application. However, if the fineness is lowered, the denseness of the nonwoven fabric is increased, but the fiber breakage resistance is lowered and the durability is deteriorated. On the other hand, when the fineness is increased, the fracture resistance of the fiber is increased, but the denseness of the nonwoven fabric is lowered, so that the external medicine attached to the nonwoven fabric may ooze out. Therefore, in order to combine the denseness of the nonwoven fabric required as a product and the fiber breakage resistance, it is desirable to set the fineness to, for example, 1.0 to 10 dtex. The fiber length is not particularly limited, and may be appropriately selected depending on the application and required performance.
また繊維は中実、中空のいずれでもよいが、中空繊維の場合、少ない繊維使用量で中実繊維の場合と同様の嵩高さを有する不織布とすることができるので、不織布の軽量化が図れる。 The fibers may be either solid or hollow, but in the case of hollow fibers, the nonwoven fabric having the same bulkiness as in the case of solid fibers can be obtained with a small amount of fibers used, so that the weight of the nonwoven fabric can be reduced.
上記溶融開始温度の異なる捲縮性複合繊維を含む本発明の不織布は、捲縮による収縮挙動差によって凹部の繊維同士の密着性が高まり、エンボス模様の鮮明度が高くなる。しかも繰り返し伸縮した場合のエンボス模様の保持性にも優れている。したがって、本発明の伸縮性不織布のエンボス加工されていない面に外用薬（消炎や鎮痛作用等がある薬剤）を直接的または間接的に付着することによって、伸縮性パップ剤として有用である。また本発明の不織布はエンボス模様の鮮明度が高いので、額や肩、背中などの様に高い伸縮性が必要でない部位に使用するパップ剤としても有用である。 The nonwoven fabric of the present invention containing crimped conjugate fibers having different melting start temperatures increases the adhesion between the fibers in the recesses due to the difference in shrinkage behavior due to crimping, and the embossed pattern becomes sharper. In addition, the embossed pattern retainability is excellent when repeatedly stretched. Therefore, it is useful as an elastic poultice by directly or indirectly attaching an external medicine (a drug having anti-inflammatory or analgesic action) to the non-embossed surface of the elastic nonwoven fabric of the present invention. Moreover, since the embossed pattern has high definition, the nonwoven fabric of the present invention is also useful as a poultice used in areas such as the forehead, shoulders, and back where high stretchability is not required.
以下、本発明の不織布の製造方法を説明するが、下記製造方法に限定されず、適宜変更を加えることも可能である。またサイドバイサイド型や偏心芯鞘型の複合繊維は公知の製法で製造された市販品を使用できる。 Hereinafter, although the manufacturing method of the nonwoven fabric of this invention is demonstrated, it is not limited to the following manufacturing method, It is also possible to add a change suitably. As the side-by-side type or eccentric core-sheath type composite fiber, a commercial product manufactured by a known manufacturing method can be used.
高融点複合繊維Ａと低融点複合繊維Ｂを所望の混合率（好ましくは１０：９０〜９０：１０）で均一混合して所望の目付量とした後、或いは非捲縮性繊維と捲縮性複合繊維（高融点複合繊維と低融点複合繊維）を所望の混合率（好ましくは６０：４０〜０：１００）で均一混合して所望の目付量とした後、カーディング処理やエアレイ処理など公知の方法によって繊維ウエッブを作成する。次いで該ウエッブにニードルパンチ加工等の物理的交絡処理を施して繊維を交絡させ、次いで熱風ドライヤーや赤外線ランプなどの加熱手段によって熱処理して繊維を捲縮させる。この際の熱処理温度は繊維の捲縮発現温度であればよい。尚、繊維を構成する樹脂の融点等の性質によって捲縮発現温度は異なるが、例えば高融点複合繊維Ａと低融点複合繊維Ｂを構成する高融点樹脂と低融点樹脂がポリエステル／変性ポリエステルであって、その融点がいずれも２５５〜２７０℃／融点２００〜２５０℃の範囲内にある場合、熱処理温度が低すぎると、捲縮発現が不十分になり、また得られる不織布の熱セット性も悪くなることから、温度範囲は好ましくは１００℃以上、より好ましくは１１０℃以上、更に好ましくは１２０℃以上とすることが望ましい。また温度が高すぎると捲縮が細かく形成されて不織布の触感が硬くなると共に、伸縮性も悪くなったり、繊維が溶融することもあるので、繊維の溶融開始温度未満にする必要がある。好ましくは２００℃未満、より好ましくは１９０℃以下、更に好ましくは１８０℃以下である。またこの熱処理速度（滞留時間）は、十分な捲縮が得られる速度であればよい。熱処理速度が遅すぎると温度設定によっては繊維が過度に捲縮されてしまい、不織布が硬くなる等の問題を生じることがある。したがって処理速度は２ｍ／ｍｉｎ以上とすることが好ましく、より好ましくは３ｍ／ｍｉｎ以上、更に好ましくは４ｍ／ｍｉｎ以上である。一方、熱処理速度が速すぎると捲縮が不十分となる等の問題を生じることがある。したがって処理速度は好ましくは２０ｍ／ｍｉｎ以下、より好ましくは１８ｍ／ｍｉｎ以下、更に好ましくは１６ｍ／ｍｉｎ以下である。熱処理後、得られた不織布は一旦巻き取ってもよいし、巻き取らずに連続的にエンボス処理を施してもよい。 The high melting point conjugate fiber A and the low melting point conjugate fiber B are uniformly mixed at a desired mixing ratio (preferably 10:90 to 90:10) to obtain a desired basis weight, or non-crimped fiber and crimpable A composite fiber (a high melting point composite fiber and a low melting point composite fiber) is uniformly mixed at a desired mixing ratio (preferably 60:40 to 0: 100) to obtain a desired basis weight, and then known as a carding process or an air array process. A fiber web is prepared by the method described above. The web is then subjected to physical entanglement such as needle punching to entangle the fibers, and then heat treated by a heating means such as a hot air dryer or an infrared lamp to crimp the fibers. The heat treatment temperature at this time may be a crimp expression temperature of the fiber. Although the crimp development temperature varies depending on the melting point of the resin constituting the fiber, for example, the high melting point resin and the low melting point resin constituting the high melting point composite fiber A and the low melting point composite fiber B are polyester / modified polyester. When the melting points are in the range of 255 to 270 ° C./melting point of 200 to 250 ° C., if the heat treatment temperature is too low, the expression of crimp is insufficient and the heat setting property of the resulting nonwoven fabric is poor. Therefore, the temperature range is preferably 100 ° C. or higher, more preferably 110 ° C. or higher, and still more preferably 120 ° C. or higher. If the temperature is too high, the crimps are finely formed and the non-woven fabric becomes hard to touch, and the stretchability may be deteriorated or the fibers may be melted. Therefore, the temperature needs to be lower than the melting start temperature of the fibers. Preferably it is less than 200 degreeC, More preferably, it is 190 degrees C or less, More preferably, it is 180 degrees C or less. Further, the heat treatment rate (residence time) may be a rate at which sufficient crimp is obtained. If the heat treatment rate is too slow, depending on the temperature setting, the fibers may be excessively crimped and the nonwoven fabric may become hard. Accordingly, the processing speed is preferably 2 m / min or more, more preferably 3 m / min or more, and further preferably 4 m / min or more. On the other hand, if the heat treatment rate is too high, problems such as insufficient crimping may occur. Accordingly, the treatment speed is preferably 20 m / min or less, more preferably 18 m / min or less, and still more preferably 16 m / min or less. After the heat treatment, the obtained nonwoven fabric may be wound up once or may be embossed continuously without being wound up.
不織布にエンボス処理を施す場合、所望の模様に対応する凹凸（エンボス模様）が形成されたエンボスロール（金属等の耐熱素材）と、該エンボスロールに対向する平坦な耐熱ロール（耐熱ゴムなどの耐熱素材）を有するエンボスカレンダー装置を使用し、該ロール間に不織布を通して不織布表面にエンボスロールを押圧してエンボス模様を転写する。この時、エンボスロールの温度は不織布を構成する繊維の交絡部が融着しない様に、融点未満の温度としなければならない。高い伸縮性を維持しながら繊維同士の密着性を高めてエンボス模様の鮮明度を高めるには、熱処理時に採用した温度近傍であることが望ましく、具体的には熱処理温度＋１０℃〜熱処理温度−２０℃の範囲内で、且つ繊維が融着しない温度であることが推奨される。エンボスロールの温度が熱処理温度＋１０℃を超えて高温になると、繊維が硬くなり、不織布の伸縮性が低下する。一方、エンボスロールの温度が熱処理温度−２０℃を超えて低温になると、繊維同士の密着性が不十分となり、エンボス模様がぼやけて不鮮明となるので好ましくない。このエンボス処理速度は、エンボスロールのエンボス模様が不織布に転写できるのであれば特に限定されず、装置の能力や生産性を考慮して適宜決定すればよい。また対向する一対のエンボスロールと耐熱ロールの間隔は特に限定されず、不織布にエンボス模様が転写できる様に線圧を調整すればよい。 When embossing is applied to a nonwoven fabric, an embossing roll (a heat-resistant material such as metal) on which unevenness (embossing pattern) corresponding to a desired pattern is formed, and a flat heat-resistant roll (heat-resistant rubber or other heat-resistant material) facing the embossing roll The embossing calender apparatus which has a raw material) is used, an embossing roll is pressed on the nonwoven fabric surface through a nonwoven fabric between this roll, and an embossing pattern is transcribe | transferred. At this time, the temperature of the embossing roll must be lower than the melting point so that the entangled portions of the fibers constituting the nonwoven fabric are not fused. In order to increase the adhesion between fibers and increase the sharpness of the embossed pattern while maintaining high stretchability, it is desirable that the temperature be in the vicinity of the temperature employed during heat treatment, specifically, heat treatment temperature + 10 ° C. to heat treatment temperature −20. It is recommended that the temperature be within the range of 0 ° C. and the fibers are not fused. When the temperature of the embossing roll exceeds the heat treatment temperature + 10 ° C. and becomes a high temperature, the fiber becomes hard and the stretchability of the nonwoven fabric decreases. On the other hand, when the temperature of the embossing roll exceeds the heat treatment temperature of −20 ° C., the adhesion between the fibers becomes insufficient, and the embossed pattern becomes blurred and unclear. The embossing speed is not particularly limited as long as the embossing pattern of the embossing roll can be transferred to the nonwoven fabric, and may be appropriately determined in consideration of the capability and productivity of the apparatus. Moreover, the space | interval of a pair of embossing roll and heat-resistant roll which opposes is not specifically limited, What is necessary is just to adjust a linear pressure so that an embossing pattern can be transcribe | transferred to a nonwoven fabric.
以下、実施例によって本発明を説明するが、本発明を下記実施例に限定する趣旨ではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention, it is not the meaning which limits this invention to the following Example.
目付量：試料から５００ｍｍ×５００ｍｍの試験片を切り出し、試験片の測定値を４倍した値（単位はｇ／ｍ2）。尚、試験片は３つ用意し、各測定値の平均を求めて目付量とする。 Weight per unit area: A test piece of 500 mm × 500 mm was cut out from the sample, and the measured value of the test piece was quadrupled (unit: g / m 2 ). Three test pieces are prepared, and the average of each measured value is obtained as the basis weight.
厚さ：試料から５００ｍｍ×５００ｍｍの試験片を切り出し、ダイヤルゲージ（接触面積５ｃｍ2、押し圧２０ｇ）で３点測定した（単位はｍｍ）。尚、試験片は３つ用意し、各測定値の平均を求めて厚さとする。 Thickness: A test piece of 500 mm × 500 mm was cut out from the sample and measured at 3 points with a dial gauge (contact area 5 cm 2 , pressing pressure 20 g) (unit: mm). Three test pieces are prepared, and the average of each measured value is obtained as the thickness.
５０％モジュラス強度：試験機（東洋ボールドイン社製：テンシロン）に試料（巾５ｃｍ×長さ３０ｃｍ）をセット（挟みしろ：両端５ｃｍづつ、挟み間隔：２０ｃｍ）し、引張り速度２０ｃｍ／ｍｉｎで１５０％の長さ（挟み間隔：３０ｃｍ）まで伸長した時の応力を測定する。尚、各３回行なってその平均値を採用する。 50% modulus strength: A sample (width 5 cm × length 30 cm) is set on a testing machine (Toyo Bold-In Co., Ltd .: Tensilon) (squeeze margin: 5 cm at both ends, sandwiching interval: 20 cm), and a tensile speed of 20 cm / min is 150. Measure the stress when stretched to a length of% (spacing interval: 30 cm). In addition, it carries out 3 times each and the average value is employ | adopted.
５０％伸長回復率：試験機（東洋ボールドイン社製：テンシロン）に試料（巾５ｃｍ×長さ３０ｃｍ）をセット（挟みしろ：両端５ｃｍづつ、挟み間隔２０ｃｍ）し、引張り速度２０ｃｍ／ｍｉｎで１５０％の長さ（挟み間隔３０ｃｍ）まで伸長した後、同じ速度（２０ｃｍ／ｍｉｎ）で原点（挟み間隔２０ｃｍ）まで戻した後、伸長前後の試料の長さから回復率を算出する。尚、各３回行なってその平均値を採用する。 50% elongation recovery rate: A sample (width 5 cm × length 30 cm) is set on a testing machine (Toyo Bold-In Co., Ltd .: Tensilon). After extending to% length (clamping interval 30 cm), returning to the origin (clamping interval 20 cm) at the same speed (20 cm / min), the recovery rate is calculated from the length of the sample before and after extension. In addition, it carries out 3 times each and employ | adopts the average value.
繊維の溶融開始温度測定（ＤＳＣ）：示差熱分析計（セイコー電子工業株式会社製 ＳＳＣ５０００ ＤＳＣ２１０）を用いて試料の吸発熱曲線を測定（昇温速度２０℃／ｍｉｎ）し、溶解開始温度を繊維の溶融開始温度とする。 Measurement of fiber melting start temperature (DSC): Measure the endothermic curve of the sample using a differential thermal analyzer (SSC5000 DSC210 manufactured by Seiko Denshi Kogyo Co., Ltd.) (temperature increase rate 20 ° C./min), and set the melting start temperature to fiber. The melting start temperature of
エンボス模様鮮明度評価（目視判定）：
試料に転写されたエンボス文字（凹部）の鮮明度を下記の基準で評価する。評価はパネラー３名による目視評価の平均である。判定に際しては室内蛍光灯（東芝製：４０ワット形、ＦＬＲ４０Ｓ・Ｗ／Ｍ／３６ 白色）の下で、白紙（２９７×４２０ｍｍ、ＫＡＯ、インクジェット専用紙 表面を上）の上に試料（２９７×２１０ｍｍ）を載置したものを壁に貼り、６０ｃｍ離れた位置（正面）から水平視する。
◎ 印字が鮮明であり、全ての印字（凹部）を判別できる
○ 印字は鮮明であるが、大きい文字に比べて小さい文字の鮮明度が低い
△ 不鮮明な印字が多く、大きい文字はかろうじて判別できる
× 不鮮明な印字が多く、印字をはっきりと判別できない
Embossed pattern sharpness evaluation (visual judgment):
The sharpness of the embossed characters (recesses) transferred to the sample is evaluated according to the following criteria. Evaluation is the average of visual evaluation by three panelists. For the judgment, under the indoor fluorescent lamp (Toshiba: 40 Watt type, FLR40S · W / M / 36 white), on the white paper (297 × 420mm, KAO, inkjet paper surface top) (297 × 210mm) ) Is affixed to the wall and viewed horizontally from a position 60 cm away (front).
◎ The print is clear and all prints (recesses) can be distinguished. ○ The print is clear, but the sharpness of small characters is lower than that of large characters. △ Many prints are unclear and barely distinguishable large characters. There are many unclear prints and the prints cannot be clearly distinguished.
試料の凹部の繊維の密着性：
不織布凹部の任意の１０箇所を選び、マイクロスコープ（株式会社キーエンス製）により３０倍（視野２ｍｍ×１．５ｍｍ）に拡大し、該凹部の繊維の密着度を調べる。尚、評価は１０箇所測定した平均値である。
◎ 圧着されていない繊維の本数：１本未満
○ 圧着されていない繊維の本数：１〜５本未満
△ 圧着されていない繊維の本数：５〜１０本未満
× 圧着されていない繊維の本数：１０本以上
Adhesion of fibers in the concave part of the sample:
Arbitrary ten places of the nonwoven fabric recessed part are selected, and it expands 30 times (visual field 2mm x 1.5mm) with a microscope (made by Keyence Corporation), and the adhesion degree of the fiber of this recessed part is investigated. In addition, evaluation is the average value measured 10 places.
◎ Number of unbonded fibers: less than 1 ○ Number of unbonded fibers: less than 1-5 △ Number of unbonded fibers: less than 5-10 × Number of unbonded fibers: 10 More than books
印字保持性：
試料（巾５ｃｍ×長さ２０ｃｍ）の印字されていない面と、不織布シップ剤（経皮吸収型鎮痛消炎剤、１０ｃｍ×１４ｃｍ、尚、関節用の高伸縮性を有するシップ剤）のシップ薬剤面を貼り合せた後、該印字面に荷重１００ｇ／ｃｍ2をかけて２４時間放置した。その後、試験機（東洋ボールドイン社製：テンシロン）に試料の長さ方向をセット（初期挟み間隔１００ｍｍ）し、初期荷重０．５ｍｇで挟み間隔が１５０ｍｍになるまで引張った後（引張り速度２００ｍｍ／ｍｉｎ）初期挟み間隔まで戻し（戻し速度２００ｍｍ／ｍｉｎ）、この伸縮動作を１０回繰返した後、印字の変形状態を下記基準で評価する。尚、３回同様の試験を行い、その平均値で表す。
◎ 印字の変形がなく、全ての文字を判別できる
○ 印字の変形が多少生じているが、全ての文字を判別できる
△ 印字の変形が生じ、判別できる文字と判別できない文字がある
× 印字の変形度合が大きく、文字の判別が困難である
Print retention:
The non-printed surface of the sample (width 5 cm × length 20 cm) and the surface of the non-woven shipping agent (percutaneous absorption type analgesic / anti-inflammatory agent, 10 cm × 14 cm, ship agent having high elasticity for joints) Then, a load of 100 g / cm 2 was applied to the printed surface and left for 24 hours. Thereafter, the length direction of the sample was set on a testing machine (manufactured by Toyo Bold-In Co., Ltd .: Tensilon) (initial pinching interval 100 mm), and pulled until the pinching interval became 150 mm with an initial load of 0.5 mg (pulling speed 200 mm / min) Return to the initial pinching interval (returning speed 200 mm / min), repeat this expansion and contraction operation 10 times, and then evaluate the deformation state of the print according to the following criteria. In addition, the same test was performed 3 times and expressed by the average value.
◎ All characters can be distinguished without any deformation of printing ○ Some deformation of printing has occurred, but all characters can be identified △ Some deformation of printing has occurred and some characters cannot be identified The degree is high and it is difficult to distinguish characters
試料Ｎｏ．１
高融点複合繊維Ａ：繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃）／低融点ポリエステル（融点２５０℃）複合繊維、サイドバイサイド型
低融点複合繊維Ｂ：繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃／低融点ポリエステル（２３２℃）複合繊維、サイドバイサイド型
高融点複合繊維Ａ（７０質量％）と低融点複合繊維Ｂ（３０質量％）を均一に混合して目付量を約１００ｇ／ｍ2とし、次いでカーディング加工を施してウエッブ状にした後、ニードルパンチ加工（針深さ８．０ｍｍ、打ち込み本数２００本／ｃｍ2）を施してからホットエアースルー方式の熱処理機で熱処理（１６０℃、滞留時間３０秒）して捲縮を発現させてから、不織布を巻き取った。次いで不織布は、図１に示す文字が刻印された鉄製ロール（エンボスロール）と、該ロールに対向する耐熱ゴムロールを有するエンボスカレンダー装置（エンボスロール温度１６０℃、処理速度５ｍ／ｍｉｎ、線圧１００ｋｇ／ｃｍ）で処理し、所定のエンボス模様（凹凸）が付与された不織布（試料Ｎｏ．１）を得た。
Sample No. 1
High melting point composite fiber A: fineness 2.2 decitex, average fiber length 51 mm polyester (melting point 262 ° C.) / Low melting point polyester (melting point 250 ° C.) composite fiber, side-by-side low melting point composite fiber B: fineness 2.2 decitex, average Polyester with a fiber length of 51 mm (melting point: 262 ° C./low melting point polyester (232 ° C.) composite fiber, side-by-side type high melting point composite fiber A (70% by mass) and low melting point composite fiber B (30% by mass) are uniformly mixed to provide a basis weight The amount is about 100 g / m 2 , then carded to make a web, then needle punched (needle depth 8.0 mm, number of driven 200 / cm 2 ) and then hot air-through The nonwoven fabric was wound up after the crimp was developed by heat treatment (160 ° C., residence time 30 seconds) with a heat treatment machine. Is an embossing calender device (embossing roll temperature 160 ° C., processing speed 5 m / min, linear pressure 100 kg / cm) having an iron roll (embossing roll) engraved with the characters shown in FIG. 1 and a heat-resistant rubber roll facing the roll. The nonwoven fabric (sample No. 1) to which the predetermined embossed pattern (unevenness) was given was obtained.
尚、エンボス加工によって不織布に形成したエンボス模様（図１）はいずれの試料も同じである。エンボスロールには、1文字のサイズが略２４ｐｔ（大文字は略６×６ｍｍ、小文字は略６×４ｍｍ）である大英文字を８字（Ａ，ｂ，ｃ，ｄ，ｅ，ｆ、ｇ、ｈ）と１文字のサイズが略１２ｐｔ（略３×３ｍｍ）の小英文字を１６字（Ａ〜Ｐ）を印字単位とし、該印字単位を複数形成した（文字間隔は等間隔とした）。この際の印字単位のサイズは図１に示す様に、巾１２ｍｍ、長さ４０ｍｍの長方形の升を２段に分け、上段（巾６ｍｍ、長さ４０ｍｍ）に英文字８字、下段（巾６ｍｍ、長さ４０ｍｍ）に英文字１６文字とした。また印字単位の配置は、印字単位の長さ方向の中心線が、不織布横方向に対して３０°の傾斜角となる様に配置する共に、該中心線の延長線上に１７ｍｍの間隔を空けて印字単位を繰り返した。更に不織布縦方向には、同じ傾斜角で印字単位を繰り返した。尚、不織布縦方向で隣接している印字単位の中心線間隔は４０ｍｍである。また不織布縦方向で隣接する印字単位の遅れ距離は７ｍｍとした。印字された不織布の凹部面積率は、いずれの試料も２７％であった。尚、試料は縦方向より横方向の方が伸長度が高かった。また各実験で用いる試験片の切り出しは、試験片長手方向の伸長度が高くなる様に切り出した。
In addition, the embossing pattern (FIG. 1) formed in the nonwoven fabric by embossing is the same for all samples. The embossing roll has 8 letters (A, b, c, d, e, f, g, h) with a single character size of about 24pt (upper case is about 6x6mm, lower case is about 6x4mm). ) And 16 small letters (A to P) having a character size of approximately 12 pt (approximately 3 × 3 mm) as a printing unit, and a plurality of the printing units are formed (character spacing is equal). As shown in FIG. 1, the size of the printing unit at this time is divided into two rows of rectangular ridges with a width of 12 mm and a length of 40 mm, and the upper row (width 6 mm,
試料Ｎｏ．２
高融点複合繊維Ａ：繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃）／低融点ポリエステル（融点２５０℃）複合繊維、サイドバイサイド型
低融点複合繊維Ｂ：繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃／低融点ポリエステル（２４５℃）複合繊維、サイドバイサイド型
高融点複合繊維Ａ（８０質量％）と低融点複合繊維Ｂ（２０質量％）を均一に混合して目付量を約１１０ｇ／ｍ2とし、次いでカーディング加工を施してウエッブ状にした後、ニードルパンチ加工（針深さ８．０ｍｍ、打ち込み本数２００本／ｃｍ2）を施してからホットエアースルー方式の熱処理機で熱処理（１７０℃、滞留時間３０秒）して捲縮を発現させてから、不織布を巻き取った。次いで不織布は、図１に示す文字が刻印された鉄製ロール（エンボスロール）と、該ロールに対向する耐熱ゴムロールを有するエンボスカレンダー装置（エンボスロール温度１６０℃、処理速度５ｍ／ｍｉｎ、線圧１３３ｋｇ／ｃｍ）で処理し、所定のエンボス模様（凹凸）が付与された不織布（試料Ｎｏ．２）を得た。
Sample No. 2
High melting point composite fiber A: fineness 2.2 decitex, average fiber length 51 mm polyester (melting point 262 ° C.) / Low melting point polyester (melting point 250 ° C.) composite fiber, side-by-side low melting point composite fiber B: fineness 2.2 decitex, average Polyester with a fiber length of 51 mm (melting point: 262 ° C./low melting point polyester (245 ° C.) composite fiber, side-by-side type high melting point composite fiber A (80% by mass) and low melting point composite fiber B (20% by mass) are uniformly mixed. The amount is about 110 g / m 2 , then carded to make a web, then needle punched (needle depth 8.0 mm, driven 200 / cm 2 ) and then hot air-through The nonwoven fabric was wound up after the crimp was developed by heat treatment (170 ° C., residence time 30 seconds) with a heat treatment machine. Is an embossing calender device (embossing roll temperature 160 ° C., processing speed 5 m / min, linear pressure 133 kg / cm) having an iron roll (embossing roll) engraved with the characters shown in FIG. 1 and a heat-resistant rubber roll facing the roll. The nonwoven fabric (sample No. 2) to which the predetermined embossed pattern (unevenness) was given was obtained.
試料Ｎｏ．３
高融点複合繊維Ａ：繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃）／低融点ポリエステル（融点２５０℃）複合繊維、サイドバイサイド型
低融点複合繊維Ｂ：繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃／低融点ポリエステル（２４５℃）複合繊維、サイドバイサイド型
高融点複合繊維Ａ（３０質量％）と低融点複合繊維Ｂ（７０質量％）を均一に混合して目付量を約１１０ｇ／ｍ2とし、次いでカーディング加工を施してウエッブ状にした後、ニードルパンチ加工（針深さ８．０ｍｍ、打ち込み本数２００本／ｃｍ2）を施してからホットエアースルー方式の熱処理機で熱処理（１７０℃、滞留時間３０秒）して捲縮を発現させてから、不織布を巻き取った。次いで不織布は、図１に示す文字が刻印された鉄製ロール（エンボスロール）と、該ロールに対向する耐熱ゴムロールを有するエンボスカレンダー装置（エンボスロール温度１７０℃、処理速度５ｍ／ｍｉｎ、線圧６７ｋｇ／ｃｍ）で処理し、所定のエンボス模様（凹凸）が付与された不織布（試料Ｎｏ．３）を得た。
Sample No. 3
High melting point composite fiber A: fineness 2.2 decitex, average fiber length 51 mm polyester (melting point 262 ° C.) / Low melting point polyester (melting point 250 ° C.) composite fiber, side-by-side low melting point composite fiber B: fineness 2.2 decitex, average Polyester with a fiber length of 51 mm (melting point: 262 ° C./low melting point polyester (245 ° C.) composite fiber, side-by-side type high melting point composite fiber A (30% by mass) and low melting point composite fiber B (70% by mass) are uniformly mixed. The amount is about 110 g / m 2 , then carded to make a web, then needle punched (needle depth 8.0 mm, driven 200 / cm 2 ) and then hot air-through The nonwoven fabric was wound up after the crimp was developed by heat treatment (170 ° C., residence time 30 seconds) with a heat treatment machine. Is an embossing calender device (embossing roll temperature 170 ° C., processing speed 5 m / min, linear pressure 67 kg / cm) having an iron roll (embossing roll) engraved with the characters shown in FIG. 1 and a heat-resistant rubber roll facing the roll. The nonwoven fabric (sample No. 3) to which the predetermined embossed pattern (unevenness) was given was obtained.
試料Ｎｏ．４
試料Ｎｏ．１の高融点複合繊維Ａと低融点複合繊維Ｂを用いた。
非捲縮性繊維：繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル繊維（融点２６２℃）
高融点複合繊維Ａ、低融点複合繊維Ｂと、非捲縮性繊維を均一に混合して目付量８０ｇ／ｍ2とし、次いでカーディング加工を施してウエッブ状にした後、ニードルパンチ加工（針深さ８．０ｍｍ、打ち込み本数２００本／ｃｍ2）を施してからホットエアースルー方式の熱処理機で熱処理（１７０℃、滞留時間３０秒）して捲縮を発現させてから、不織布を巻き取った。次いで不織布は、図１に示す文字が刻印された鉄製ロール（エンボスロール）と、該ロールに対向する耐熱ゴムロールを有するエンボスカレンダー装置（エンボスロール温度１７０℃、処理速度５ｍ／ｍｉｎ、線圧１３３ｋｇ／ｃｍ）で処理し、所定のエンボス模様（凹凸）が付与された不織布（試料Ｎｏ．４）を得た。
尚、均一混合時の捲縮性複合繊維（高融点複合繊維Ａ＋低融点複合繊維Ｂ）と非捲縮性複合繊維の混繊割合（質量％）は５０：５０とし、また高融点複合繊維Ａと低融点複合繊維Ｂの混繊割合（質量％）は７０：３０とした。
Sample No. 4
Sample No. 1 high melting point conjugate fiber A and low melting point conjugate fiber B were used.
Non-crimped fiber: polyester fiber with a fineness of 2.2 dtex and an average fiber length of 51 mm (melting point 262 ° C.)
The high melting point composite fiber A, the low melting point composite fiber B and the non-crimp fiber are uniformly mixed to a basis weight of 80 g / m 2 , then carded to form a web, and then needle punched (needle After applying a depth of 8.0 mm and a driving number of 200 pieces / cm 2 ), heat treatment (170 ° C., residence time 30 seconds) with a hot air-through heat treatment machine to develop crimps, and then winding the nonwoven fabric It was. Next, the non-woven fabric is an embossing calender device (embossing roll temperature 170 ° C., processing speed 5 m / min, linear pressure 133 kg / min) having an iron roll (embossing roll) on which the characters shown in FIG. 1 are engraved and a heat-resistant rubber roll facing the roll. cm) to obtain a nonwoven fabric (sample No. 4) provided with a predetermined embossed pattern (unevenness).
In addition, the mixing ratio (mass%) of the crimpable conjugate fiber (high-melting conjugate fiber A + low-melting conjugate fiber B) and non-crimped conjugate fiber during uniform mixing is 50:50, and the high-melting conjugate fiber A And the low-melting-point composite fiber B was 70:30.
試料Ｎｏ．５
繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃）／低融点ポリエステル（融点２４０℃）複合繊維（サイドバイサイド型）を均一に開繊して目付量を約８０ｇ／ｍ2とし、次いでカーディング加工を施してウエッブ状にした後、ニードルパンチ加工（針深さ８．０ｍｍ、打ち込み本数２００本／ｃｍ2）を施してからホットエアースルー方式の熱処理機で熱処理（１６０℃、滞留時間３０秒）して捲縮を発現させてから、不織布を巻き取った。次いで不織布は、図１に示す文字が刻印された鉄製ロール（エンボスロール）と、該ロールに対向する耐熱ゴムロールを有するエンボスカレンダー装置（エンボスロール温度１７０℃、処理速度５ｍ／ｍｉｎ、線圧１３３ｋｇ／ｃｍ）で処理し、所定のエンボス模様（凹凸）が付与された不織布（試料Ｎｏ．５）を得た。
Sample No. 5
A polyester fiber (melting point 262 ° C.) / Low melting point polyester (melting point 240 ° C.) composite fiber (side-by-side type) with a fineness of 2.2 decitex and an average fiber length of 51 mm is uniformly opened to a weight per unit of about 80 g / m 2 , After carding to make a web, needle punching (needle depth 8.0 mm, number of driven 200 / cm 2 ) is applied, followed by heat treatment (160 ° C., residence time) using a hot air through heat treatment machine 30 seconds) to develop crimps, and then wound the nonwoven fabric. Next, the non-woven fabric is an embossing calender device (embossing roll temperature 170 ° C., processing speed 5 m / min, linear pressure 133 kg / min) having an iron roll (embossing roll) on which the characters shown in FIG. 1 are engraved and a heat-resistant rubber roll facing the roll. cm) to obtain a nonwoven fabric (Sample No. 5) provided with a predetermined embossed pattern (unevenness).
試料Ｎｏ．６
繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃）／低融点ポリエステル（融点２４５℃）複合繊維（サイドバイサイド型）を均一に開繊して目付量を約８０ｇ／ｍ2とし、次いでカーディング加工を施してウエッブ状にした後、ニードルパンチ加工（針深さ８．０ｍｍ、打ち込み本数２００本／ｃｍ2）を施してからホットエアースルー方式の熱処理機で熱処理（１７０℃、滞留時間３０秒）して捲縮を発現させてから、不織布を巻き取った。次いで不織布は、図１に示す文字が刻印された鉄製ロール（エンボスロール）と、該ロールに対向する耐熱ゴムロールを有するエンボスカレンダー装置（エンボスロール温度１７０℃、処理速度５ｍ／ｍｉｎ、線圧１３３ｋｇ／ｃｍ）で処理し、所定のエンボス模様（凹凸）が付与された不織布（試料Ｎｏ．６）を得た。
Sample No. 6
A polyester fiber (melting point 262 ° C.) / Low melting point polyester (melting point 245 ° C.) composite fiber (side-by-side type) having a fineness of 2.2 decitex and an average fiber length of 51 mm is uniformly spread to a weight of about 80 g / m 2 , After carding and forming into a web, needle punching (needle depth 8.0 mm, number of driven 200 / cm 2 ) is applied, followed by heat treatment (170 ° C., residence time) using a hot air through heat treatment machine 30 seconds) to develop crimps, and then wound the nonwoven fabric. Next, the non-woven fabric is an embossing calender device (embossing roll temperature 170 ° C., processing speed 5 m / min, linear pressure 133 kg / min) having an iron roll (embossing roll) on which the characters shown in FIG. 1 are engraved and a heat-resistant rubber roll facing the roll. cm) to obtain a nonwoven fabric (sample No. 6) provided with a predetermined embossed pattern (unevenness).
試料Ｎｏ．７
繊度２．２デシテックス、平均繊維長５１ｍｍのポリエステル（融点２６２℃）／低融点ポリエステル（融点２５０℃）複合繊維（サイドバイサイド型）を均一に開繊して目付量を約１１０ｇ／ｍ2とし、次いでカーディング加工を施してウエッブ状にした後、ニードルパンチ加工（針深さ８．０ｍｍ、打ち込み本数２００本／ｃｍ2）を施してからホットエアースルー方式の熱処理機で熱処理（１７０℃、滞留時間３０秒）して捲縮を発現させてから、不織布を巻き取った。次いで不織布は、図１に示す文字が刻印された鉄製ロール（エンボスロール）と、該ロールに対向する耐熱ゴムロールを有するエンボスカレンダー装置（エンボスロール温度１７０℃、処理速度５ｍ／ｍｉｎ、線圧１３３ｋｇ／ｃｍ）で処理し、所定のエンボス模様（凹凸）が付与された不織布（試料Ｎｏ．７）を得た。
試料Ｎｏ．１〜６について上記特性評価を行なった結果を表１に示す。
Sample No. 7
A polyester fiber having a fineness of 2.2 decitex and an average fiber length of 51 mm (melting point 262 ° C.) / Low melting point polyester (melting point 250 ° C.) composite fiber (side-by-side type) is uniformly spread to a basis weight of about 110 g / m 2 , After carding and forming into a web, needle punching (needle depth 8.0 mm, number of driven 200 / cm 2 ) is applied, followed by heat treatment (170 ° C., residence time) using a hot air through heat treatment machine 30 seconds) to develop crimps, and then wound the nonwoven fabric. Next, the non-woven fabric is an embossing calender device (embossing roll temperature 170 ° C., processing speed 5 m / min, linear pressure 133 kg / min) having an iron roll (embossing roll) on which the characters shown in FIG. 1 are engraved and a heat-resistant rubber roll facing the roll. cm) to obtain a nonwoven fabric (Sample No. 7) provided with a predetermined embossed pattern (unevenness).
Sample No. Table 1 shows the results of the above characteristic evaluation for 1-6.
また各資料の顕微鏡写真を図２（試料Ｎｏ．２）、図３（試料Ｎｏ．３）、図４（試料Ｎｏ．５）、図５（試料Ｎｏ．７）に示す。 Moreover, the microscope picture of each material is shown in FIG. 2 (sample No. 2), FIG. 3 (sample No. 3), FIG. 4 (sample No. 5), and FIG.
伸縮性不織布のエンボス加工されていない面に外用薬を直接的または間接的に付着することによって、伸縮性パップ剤として利用することができる。したがって本発明のエンボス加工が施された伸縮性不織布は、パップ剤など、薬剤貼付型医薬品の基材として有用である。 By directly or indirectly attaching the external medicine to the non-embossed surface of the elastic nonwoven fabric, it can be used as an elastic poultice. Therefore, the stretchable nonwoven fabric to which the embossing process of the present invention is applied is useful as a base material for a medicated patch such as a poultice.
Claims (9)
前記高融点複合繊維Ａは、高融点ポリエステル樹脂と低融点ポリエステル樹脂からなり、前記低融点複合繊維Ｂは、前記高融点ポリエステル樹脂と融点が同一または異なる高融点ポリエステル樹脂と前記低融点ポリエステル樹脂の融点よりも３℃以上低い融点の低融点ポリエステル樹脂からなるものである請求項１〜４のいずれかに記載の伸縮性不織布。 The stretchable nonwoven fabric is entangled with a high melting point composite fiber A having a high melting start temperature and a low melting point composite fiber B having a low melting start temperature,
The high-melting point composite fiber A is composed of a high-melting point polyester resin and a low-melting point polyester resin, and the low-melting point composite fiber B is composed of a high-melting point polyester resin and a low-melting point polyester resin having the same or different melting points from the high-melting point polyester resin. The stretchable nonwoven fabric according to any one of claims 1 to 4, wherein the stretchable nonwoven fabric is made of a low-melting polyester resin having a melting point that is 3 ° C or more lower than the melting point.
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