JP6053353B2 - Method for producing laminated nonwoven fabric - Google Patents
Method for producing laminated nonwoven fabric Download PDFInfo
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- JP6053353B2 JP6053353B2 JP2012146213A JP2012146213A JP6053353B2 JP 6053353 B2 JP6053353 B2 JP 6053353B2 JP 2012146213 A JP2012146213 A JP 2012146213A JP 2012146213 A JP2012146213 A JP 2012146213A JP 6053353 B2 JP6053353 B2 JP 6053353B2
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- 239000004745 nonwoven fabric Substances 0.000 title claims description 104
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000835 fiber Substances 0.000 claims description 208
- 229920005992 thermoplastic resin Polymers 0.000 claims description 37
- 238000002844 melting Methods 0.000 claims description 22
- 230000008018 melting Effects 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 15
- 238000010030 laminating Methods 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 229920000742 Cotton Polymers 0.000 description 12
- 229920000642 polymer Polymers 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 11
- 208000035824 paresthesia Diseases 0.000 description 11
- JVTAAEKCZFNVCJ-REOHCLBHSA-N L-lactic acid Chemical compound C[C@H](O)C(O)=O JVTAAEKCZFNVCJ-REOHCLBHSA-N 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 8
- 229920002994 synthetic fiber Polymers 0.000 description 8
- 239000012209 synthetic fiber Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000004049 embossing Methods 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 229930182843 D-Lactic acid Natural products 0.000 description 3
- JVTAAEKCZFNVCJ-UWTATZPHSA-N D-lactic acid Chemical compound C[C@@H](O)C(O)=O JVTAAEKCZFNVCJ-UWTATZPHSA-N 0.000 description 3
- 206010020751 Hypersensitivity Diseases 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 3
- 230000007815 allergy Effects 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 229940022769 d- lactic acid Drugs 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000433 Lyocell Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 208000026935 allergic disease Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- QKSIFUGZHOUETI-UHFFFAOYSA-N copper;azane Chemical compound N.N.N.N.[Cu+2] QKSIFUGZHOUETI-UHFFFAOYSA-N 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000008155 medical solution Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920000118 poly(D-lactic acid) Polymers 0.000 description 1
- 229920001432 poly(L-lactide) Polymers 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Nonwoven Fabrics (AREA)
Description
本発明は、熱可塑性樹脂からなる長繊維ウエブの溶融固化物が、短繊維不織布の中に積層されてなる積層不織布に関するものである。 The present invention relates to a laminated nonwoven fabric in which a melted and solidified product of a long fiber web made of a thermoplastic resin is laminated in a short fiber nonwoven fabric.
短繊維ウエブは高圧液体流により容易に交絡するため数多く用いられている。特にスパンレース不織布は、構成繊維同士が水流の作用によって交絡して形態を保持しているため、繊維間空隙が大きく、柔軟性に優れるという特徴があり、このため、ワイパー等、特に直接、肌に触れる用途に好適に用いられている。 Many short fiber webs are used because they are easily entangled with a high pressure liquid stream. In particular, spunlace nonwoven fabric is characterized by having a large inter-fiber gap and excellent flexibility because the constituent fibers are entangled with each other by the action of water flow, and therefore has excellent flexibility. It is used suitably for the use which touches.
しかし、肌に触れる用途に用いられるワイパー等には、時に、拭いた際のゴシゴシ感が求められる場合がある。このような要求に対応する方法として、木綿のような柔らかい繊維にポリエステル等の固い繊維を混綿する方法がある。しかしながら、この方法では、ゴシゴシ感が不十分であるばかりか、肌に触れる面にポリエステル繊維が現れることになり、アレルギー等がある場合は使用できないという問題点があった。 However, a wiper or the like used for touching the skin sometimes requires a tingling feeling when wiping. As a method corresponding to such a demand, there is a method of blending hard fibers such as polyester with soft fibers such as cotton. However, this method has a problem that not only the feeling of tingling is inadequate, but also polyester fibers appear on the surface touching the skin, and cannot be used when there is an allergy or the like.
特許文献１には、水流交絡処理前の長繊維ウエブに、低温かつ低圧の熱エンボス加工を施して繊維同士を擬似接着させ、次いで、この擬似接着が施された長繊維ウエブと短繊維ウエブとを積層した積層物に水流交絡を施し、水圧によって、長繊維同士の擬似接着を解除し、長繊維が動きやすい状態にして、すなわち、短繊維が絡みやすい状態として、交絡一体化した不織布を得ることが記載されている。しかしながら、得られた不織布は、不織布内部に長繊維が堆積して存在しているため、短繊維のみからなるスパンレース不織布と比較すると、機械的強力は向上するが、ゴシゴシ感が向上するものではなかった。 In Patent Document 1, a long fiber web before hydroentanglement treatment is subjected to low-temperature and low-pressure heat embossing to pseudo-bond the fibers, and then the long-fiber web and the short-fiber web subjected to this pseudo-bonding, The laminate obtained by laminating water is subjected to hydroentanglement, and the pseudo-adhesion between the long fibers is released by water pressure so that the long fibers can move easily. It is described. However, since the obtained non-woven fabric has long fibers accumulated inside the non-woven fabric, the mechanical strength is improved as compared with the spunlace non-woven fabric consisting only of short fibers, but the feeling of tingling is not improved. There wasn't.
本発明は、上記問題を解決し、短繊維不織布が有する肌触りの良好さを保持し、かつゴシゴシ感を有する不織布を提供することを課題とする。 This invention solves the said problem, and makes it a subject to provide the nonwoven fabric which keeps the favorable touch which a short fiber nonwoven fabric has, and has a feeling of rustling.
本発明者は、上記課題を解決するために鋭意検討した結果、短繊維不織布の中に、熱可塑性樹脂からなる長繊維ウエブの溶融固化物が積層されてなる積層不織布が、上記課題を解決できることを見出し、本発明に到達した。
すなわち、本発明の要旨は下記の通りである。
（１）熱可塑性樹脂からなる長繊維ウエブの一方の表面に短繊維ウエブＡを積層し、もう一方の表面に短繊維ウエブＢを積層し、
高圧液体流を用いた繊維同士の交絡処理によりこれらを一体化した後、
得られたシートを、長繊維ウエブを構成する熱可塑性樹脂の融点以上の温度であり、かつ短繊維ウエブが溶融しない温度あるいは短繊維ウエブが熱の影響を受けない温度で熱処理して、熱可塑性樹脂からなる長繊維ウエブを溶融した後、前記熱可塑性樹脂を長繊維ウエブの形状が保たれていない不定形に固化することにより、
熱可塑性樹脂からなる不定形の溶融固化物を、短繊維ウエブＡから形成された短繊維不織布Ａと、短繊維ウエブＢから形成された短繊維不織布Ｂとの間に積層することを特徴とする積層不織布の製造方法。
As a result of intensive studies to solve the above problems, the present inventor is able to solve the above problems by a laminated nonwoven fabric obtained by laminating a melted and solidified product of a long fiber web made of a thermoplastic resin in a short fiber nonwoven fabric. And reached the present invention.
That is, the gist of the present invention is as follows .
(1) A short fiber web A is laminated on one surface of a long fiber web made of a thermoplastic resin, and a short fiber web B is laminated on the other surface.
After unifying these by entanglement treatment between fibers using a high-pressure liquid flow,
The obtained sheet is heat treated at a temperature not lower than the melting point of the thermoplastic resin constituting the long fiber web and at a temperature at which the short fiber web does not melt or at a temperature at which the short fiber web is not affected by heat. After melting the long fiber web made of resin, by solidifying the thermoplastic resin into an indefinite shape in which the shape of the long fiber web is not maintained ,
An amorphous melt-solidified product made of a thermoplastic resin is laminated between a short fiber nonwoven fabric A formed from the short fiber web A and a short fiber nonwoven fabric B formed from the short fiber web B. A method for producing a laminated nonwoven fabric.
本発明によれば、熱可塑性樹脂からなる長繊維の溶融固化物が、短繊維不織布の中に積層されているので、積層不織布は、短繊維不織布が有する肌触りの良好さを保持し、かつゴシゴシ感を有することができる。
本発明の積層不織布は、熱可塑性樹脂からなる長繊維ウエブの両面に短繊維ウエブを積層して交絡により一体化した後、加熱することにより製造できるので、長繊維ウエブの両面に積層する短繊維ウエブの目付を適宜変更することにより、肌当たりの感触を容易に調節することができる。
According to the present invention, since the melted and solidified product of long fibers made of a thermoplastic resin is laminated in the short fiber nonwoven fabric, the laminated nonwoven fabric retains the good touch of the short fiber nonwoven fabric, and Can have a feeling.
The laminated nonwoven fabric of the present invention can be manufactured by laminating short fiber webs on both sides of a thermoplastic fiber and integrating them by confounding and then heating, so that the short fibers laminated on both sides of the long fiber web By appropriately changing the basis weight of the web, the feel per skin can be easily adjusted.
次に本発明を詳細に説明する。
本発明の積層不織布は、熱可塑性樹脂からなる長繊維ウエブの溶融固化物が、短繊維不織布Ａと短繊維不織布Ｂとの間に積層されてなるものである。溶融固化物が短繊維不織布中に積層されることで、積層不織布はゴシゴシ感を有することができる。
Next, the present invention will be described in detail.
The laminated nonwoven fabric of the present invention is obtained by laminating a melted and solidified product of a long fiber web made of a thermoplastic resin between the short fiber nonwoven fabric A and the short fiber nonwoven fabric B. By laminating the melt-solidified material in the short fiber non-woven fabric, the laminated non-woven fabric can have a harsh feeling.
長繊維ウエブを構成する熱可塑性樹脂の融点は２００℃以下であることが好ましく、１５０℃以下であることがより好ましい。熱可塑性樹脂の融点が２００℃より高いと、この長繊維ウエブを溶融固化物とするのに、熱処理温度が高くなり、コスト的に不利である。すなわち、後述する積層不織布の製造方法、すなわち、この熱可塑性樹脂からなる長繊維ウエブを熱処理して長繊維を溶融する方法においては、熱処理温度が高くなり、コスト的に不利である。 The melting point of the thermoplastic resin constituting the long fiber web is preferably 200 ° C. or less, and more preferably 150 ° C. or less. When the melting point of the thermoplastic resin is higher than 200 ° C., the heat treatment temperature becomes high to make this long fiber web into a melt-solidified product, which is disadvantageous in terms of cost. That is, in the method for producing a laminated nonwoven fabric described later, that is, in a method in which a long fiber web made of this thermoplastic resin is heat treated to melt the long fibers, the heat treatment temperature becomes high, which is disadvantageous in terms of cost.
長繊維ウエブを構成する熱可塑性樹脂としては、ポリエステル系重合体、ポリオレフィン系重合体、ポリアミド系重合体、アクリル系重合体、ポリビニルアルコール系重合体およびこれらを主成分とした共重合体や、これらの重合体を複数ブレンドしたブレンド体が挙げられる。
また、ポリ乳酸系重合体（例えば、ポリ（Ｄ−乳酸）、ポリ（Ｌ−乳酸）、Ｄ−乳酸とＬ−乳酸との共重合体（Ｄ、Ｌ−乳酸共重合体）、Ｄ−乳酸とヒドロキシカルボン酸との共重合体、Ｌ−乳酸とヒドロキシカルボン酸との共重合体、あるいはＤ−乳酸とＬ−乳酸とヒドロキシカルボン酸との共重合体）などの植物由来熱可塑性樹脂は、自然環境保護の見地から好適である上、生分解性を有する。したがって、長繊維ウエブを構成する熱可塑性樹脂として植物由来熱可塑性樹脂を用い、また、短繊維不織布を構成する短繊維として例えば木綿等を用いて積層不織布を構成すると、自然環境中で分解する生分解性不織布とすることができる。
Examples of the thermoplastic resin constituting the long fiber web include polyester polymers, polyolefin polymers, polyamide polymers, acrylic polymers, polyvinyl alcohol polymers, copolymers based on these, And blends obtained by blending a plurality of polymers.
Also, polylactic acid polymers (for example, poly (D-lactic acid), poly (L-lactic acid), copolymers of D-lactic acid and L-lactic acid (D, L-lactic acid copolymer), D-lactic acid. A plant-derived thermoplastic resin such as a copolymer of L-lactic acid and hydroxycarboxylic acid, a copolymer of L-lactic acid and hydroxycarboxylic acid, or a copolymer of D-lactic acid, L-lactic acid and hydroxycarboxylic acid), It is suitable from the viewpoint of natural environment protection and has biodegradability. Therefore, when a plant-derived thermoplastic resin is used as the thermoplastic resin constituting the long-fiber web, and a laminated nonwoven fabric is formed using, for example, cotton as the short fiber constituting the short-fiber nonwoven fabric, the raw material that decomposes in the natural environment. It can be a degradable nonwoven fabric.
長繊維ウエブを構成する長繊維の断面形状は、特に限定されず、円形断面以外に、三角型、四角型、六角型等の多角形状、扁平型、トリローバル型、ヘキサローバル型、Ｗ型、Ｈ型Ｙ字型、Ｔ字型、Ｃ字型、中空形状など種々の異形断面であってもよい。 The cross-sectional shape of the long fibers constituting the long-fiber web is not particularly limited. Besides the circular cross-section, polygonal shapes such as a triangular shape, a square shape, a hexagonal shape, a flat shape, a trilobal shape, a hexalobal shape, a W shape, and an H shape. Various irregular cross sections such as a Y-shape, T-shape, C-shape, and hollow shape may be used.
長繊維の単糸繊度は、１〜２０デシテックス程度がよい。単糸繊度が１デシテックス未満になると、交絡処理によって短繊維が長繊維に絡みつきにくくウエブ層同士が一体化しにくい。一方、単糸繊度が２０デシテックスを超えると、溶融固化による溶融固化物が粗剛で非常に硬くなり過ぎる傾向にある。 The single yarn fineness of the long fibers is preferably about 1 to 20 dtex. When the single yarn fineness is less than 1 dtex, the short fibers are not easily entangled with the long fibers by the entanglement treatment, and the web layers are not easily integrated. On the other hand, when the single yarn fineness exceeds 20 dtex, the melt-solidified product by melt-solidification tends to be too rigid and very hard.
長繊維ウエブの目付や、その溶融固化物の目付は、特に限定されないが、一般的には１０〜５０ｇ／ｍ２であることが好ましく、１５〜３０ｇ／ｍ２であるより好ましい。
長繊維ウエブの目付が１０ｇ／ｍ２未満では、積層不織布における溶融固化物の目付が少なく、得られる積層不織布にゴシゴシ感が出づらいため、両表面に積層する短繊維不織布の目付によっては、本発明の目的が達成されにくくなる。
逆に、長繊維ウエブの目付が５０ｇ／ｍ２を超えると、コスト面で不利となるだけでなく、これを溶融すると、短繊維不織布の目付が薄い場合には、溶融固化物の一部が短繊維不織布の表面にまで露出することがあり、好ましくない。
Basis weight and the long fiber web, the basis weight of the melt solidified product is not particularly limited, it is preferable that in general is 10 to 50 g / m 2, preferably than being 15 to 30 g / m 2.
If the basis weight of the long fiber web is less than 10 g / m 2 , the basis weight of the melted and solidified material in the laminated nonwoven fabric is small, and the resulting laminated nonwoven fabric is less likely to feel harsh. The object of the invention is less likely to be achieved.
Conversely, if the basis weight of the long fiber web exceeds 50 g / m 2 , not only is it disadvantageous in terms of cost, but if this is melted, if the basis weight of the short fiber nonwoven fabric is thin, a part of the melt-solidified product is Since it may be exposed to the surface of a short fiber nonwoven fabric, it is not preferable.
長繊維ウエブは、構成繊維同士が熱接着により一体化したものであることが好ましく、特に熱エンボス加工により熱接着していることが好ましい。熱エンボス加工により熱接着しているウエブは、形態安定性にも優れ、後述する積層不織布の製造方法において、すなわち、この熱可塑性樹脂からなる長繊維ウエブと短繊維ウエブＡ、Ｂとを積層してなるシートに高圧液体流処理を行う際において、シートが崩れにくく、好適に用いることができる。 The long fiber web is preferably one in which the constituent fibers are integrated by thermal bonding, and is particularly preferably thermally bonded by hot embossing. The web thermally bonded by hot embossing is excellent in form stability, and in the manufacturing method of the laminated nonwoven fabric described later, that is, the long fiber web made of this thermoplastic resin and the short fiber webs A and B are laminated. When the high-pressure liquid flow treatment is performed on the sheet, the sheet is difficult to collapse and can be suitably used.
本発明の積層不織布は、上記熱可塑性樹脂からなる長繊維ウエブが、熱可塑性樹脂の融点以上の温度で溶融され、次いで固化されてなる溶融固化物が、短繊維不織布Ａと短繊維不織布Ｂとの間に交絡によって積層されたものである。したがって、溶融固化物の形状は、不定形であり、また溶融固化物の一部は、短繊維不織布を構成する短繊維同士の交絡箇所に埋入していることがある。 In the laminated nonwoven fabric of the present invention, the melted and solidified product obtained by melting the long fiber web made of the thermoplastic resin at a temperature equal to or higher than the melting point of the thermoplastic resin and then solidifying the short fiber nonwoven fabric A and the short fiber nonwoven fabric B Are stacked by interlacing. Therefore, the shape of the melt-solidified product is indefinite, and a part of the melt-solidified product may be embedded in the entangled portion of the short fibers constituting the short fiber nonwoven fabric.
短繊維不織布Ａ、Ｂを構成する短繊維としては、公知の天然繊維、再生繊維、合成繊維等を用いることができ、これらの繊維を単独または複数種混綿したものを用いることができる。なお、短繊維不織布Ａを構成する短繊維と、短繊維不織布Ｂを構成する短繊維は、同じ種類であっても、異なる種類であってもよい。 As the short fibers constituting the short fiber nonwoven fabrics A and B, known natural fibers, regenerated fibers, synthetic fibers, and the like can be used, and these fibers can be used singly or in combination. In addition, the short fiber which comprises the short fiber nonwoven fabric A, and the short fiber which comprises the short fiber nonwoven fabric B may be the same kind, or may differ.
短繊維不織布Ａ、Ｂを構成する天然繊維としては、木綿、麻、羊毛、短繊維状に裁断が施された絹が挙げられ、木綿であることが好ましい。木綿としては、晒し加工された晒し綿、織物・編物から得られた反毛であってもよい。
短繊維不織布Ａ、Ｂを構成する再生繊維としては、銅アンモニアレーヨン、ビスコースレーヨン、溶剤紡糸されたレーヨン（リヨセル）が挙げられる。
これらの天然繊維や再生繊維は、吸水性に優れているため薬液含浸に適しており、洗顔、ボディ、メイク落とし用シートとして好適に用いることができる。
Examples of the natural fibers constituting the short fiber nonwoven fabrics A and B include cotton, hemp, wool, and silk that has been cut into short fibers, and is preferably cotton. The cotton may be bleached cotton that has been bleached, or a repellent obtained from a woven or knitted fabric.
Examples of the recycled fibers constituting the short fiber nonwoven fabrics A and B include copper ammonia rayon, viscose rayon, and solvent-spun rayon (lyocell).
Since these natural fibers and regenerated fibers are excellent in water absorption, they are suitable for chemical liquid impregnation, and can be suitably used as facial cleansing, body and makeup removing sheets.
また短繊維不織布Ａ、Ｂを構成する合成繊維としては、繊維形成性を有する重合体からなるものが挙げられる。繊維形成性を有する重合体としては、ポリエステル系重合体、ポリオレフィン系重合体、ポリアミド系重合体、アクリル系重合体、ポリビニルアルコール系重合体およびこれらを主成分とした共重合体や、これらの重合体を複数ブレンドしたブレンド体が挙げられる。本発明に用いる合成繊維の繊維形態としては、前記重合体単体からなる単相形態であっても、複数種の前記重合体からなる複合形態（芯鞘型複合形態、並列型複合形態、割繊型複合形態）であってもよい。また、繊維の断面形状は、丸形、楕円形、菱形、三角形、Ｔ形、井形等の任意の形状を適宜選択すればよい。
合成繊維の融点は、長繊維ウエブを構成する熱可塑性樹脂のそれよりも３０℃以上高いことが好ましい。合成繊維の融点を３０℃以上高くすることにより、後述する積層不織布の製造方法、すなわち、この合成繊維を含む短繊維ウエブと熱可塑性樹脂からなる長繊維ウエブとを積層してなるシートを熱処理する方法においては、この合成繊維を含む短繊維ウエブは、長繊維ウエブとともに溶融することなく、また熱の影響を受けることなく、積層不織布を製造することができる。
Moreover, as a synthetic fiber which comprises the short fiber nonwoven fabrics A and B, what consists of a polymer which has fiber formation property is mentioned. Examples of the polymer having a fiber-forming property include polyester polymers, polyolefin polymers, polyamide polymers, acrylic polymers, polyvinyl alcohol polymers, copolymers based on these, and their polymers. The blend body which blended two or more coalescence is mentioned. The fiber form of the synthetic fiber used in the present invention may be a single-phase form composed of the polymer alone, or a composite form composed of a plurality of types of the polymers (core-sheath composite form, parallel composite form, split fiber). Mold composite form). Moreover, what is necessary is just to select arbitrary shapes, such as a round shape, an ellipse shape, a rhombus, a triangle, T shape, and a well shape, as the cross-sectional shape of a fiber.
The melting point of the synthetic fiber is preferably 30 ° C. or more higher than that of the thermoplastic resin constituting the long fiber web. By increasing the melting point of the synthetic fiber by 30 ° C. or more, a method for producing a laminated nonwoven fabric described later, that is, a sheet formed by laminating a short fiber web containing the synthetic fiber and a long fiber web made of a thermoplastic resin is heat-treated. In the method, a laminated nonwoven fabric can be produced without melting the short fiber web containing the synthetic fiber together with the long fiber web and without being affected by heat.
短繊維不織布Ａ、Ｂの目付は、特に限定されるものではないが、それぞれ、１０〜１５０ｇ／ｍ２であることが好ましく、１５〜１００ｇ／ｍ２であることがより好ましい。短繊維不織布Ａ、Ｂの目付が１０ｇ／ｍ２未満であると、風合いが劣り、例えば、人体に触れるような用途に用いる場合には不向きとなる上、表層に熱可塑性樹脂からなる長繊維の溶融固化物が現れる場合がある。一方、目付が１５０ｇ／ｍ２を超えると、後述する積層不織布の製造方法、すなわち、短繊維同士を交絡させるための高圧液体流処理を施す方法において、加工のエネルギーが大きくなるためコスト高となり、また、内層部に存在する短繊維相互間の交絡が十分になされないことがある。 Short fiber nonwoven fabric A, the basis weight of B include, but are not limited to, respectively, is preferably 10 to 150 g / m 2, and more preferably 15 to 100 / m 2. When the basis weight of the short fiber nonwoven fabrics A and B is less than 10 g / m 2 , the texture is inferior, for example, it is not suitable for use in applications where the human body is touched, and the long fiber made of a thermoplastic resin on the surface layer. A melt-solidified product may appear. On the other hand, when the basis weight exceeds 150 g / m 2 , in the method for producing a laminated nonwoven fabric described later, that is, in the method of performing a high-pressure liquid flow treatment for entanglement of short fibers, the processing energy increases, resulting in high cost. Moreover, the entanglement between the short fibers existing in the inner layer portion may not be sufficiently performed.
本発明の積層不織布においては、短繊維不織布Ａの目付が、短繊維不織布Ｂの目付の１．５倍以上であることが好ましい。このように設計することにより、表面と裏面の拭き心地が異なる積層不織布とすることができる。すなわち、目付が厚い短繊維不織布Ａの面で拭くと、滑らかで優しい拭き心地となり、目付が薄い短繊維不織布Ｂの面で拭くと、ゴシゴシと強く汚れを拭きとれる拭き心地となる。また目付が薄い短繊維不織布Ｂの面は、すべりが抑制されるので、短繊維不織布Ｂの面を手にあてて、短繊維不織布Ａの面で体を拭くと、より強い力で体を拭くことが可能となり、より強い爽快感を得ることができる。 In the laminated nonwoven fabric of the present invention, the basis weight of the short fiber nonwoven fabric A is preferably 1.5 times or more that of the short fiber nonwoven fabric B. By designing in this way, it can be set as the laminated nonwoven fabric from which the wiping comfort of the surface and a back surface differs. That is, wiping on the surface of the short fiber nonwoven fabric A having a thick basis weight results in a smooth and gentle wiping comfort, and wiping on the surface of the short fiber nonwoven fabric B having a thin basis weight results in a wiping comfort that wipes dirt strongly and strongly. Moreover, since the slip of the surface of the short fiber nonwoven fabric B with a small basis weight is suppressed, when the surface of the short fiber nonwoven fabric B is applied to the hand and the body is wiped with the surface of the short fiber nonwoven fabric A, the body is wiped with a stronger force. Can be obtained, and a stronger refreshing feeling can be obtained.
本発明の積層不織布を製造する方法としては、熱可塑性樹脂からなる長繊維ウエブの一方の表面に短繊維ウエブＡを積層し、もう一方の表面に短繊維ウエブＢを積層し、高圧液体流を用いた繊維同士の交絡処理によりこれらを一体化した後、得られたシートを、長繊維ウエブを構成する熱可塑性樹脂の融点以上の温度で熱処理して、熱可塑性樹脂からなる長繊維ウエブを溶融した後、固化することにより、熱可塑性樹脂からなる長繊維ウエブの溶融固化物を、短繊維ウエブＡから形成された短繊維不織布Ａと、短繊維ウエブＢから形成された短繊維不織布Ｂとの間に積層する方法が挙げられる。 As a method for producing the laminated nonwoven fabric of the present invention, a short fiber web A is laminated on one surface of a long fiber web made of a thermoplastic resin, a short fiber web B is laminated on the other surface, and a high-pressure liquid flow is produced. After these are integrated by entanglement treatment of the fibers used, the obtained sheet is heat-treated at a temperature equal to or higher than the melting point of the thermoplastic resin constituting the long fiber web to melt the long fiber web made of the thermoplastic resin. Then, by solidifying, a melt-solidified product of the long fiber web made of thermoplastic resin is obtained by combining the short fiber nonwoven fabric A formed from the short fiber web A and the short fiber nonwoven fabric B formed from the short fiber web B. The method of laminating in between is mentioned.
上記積層不織布の製造方法において、短繊維ウエブＡは短繊維不織布Ａを形成するためのものであり、また短繊維ウエブＢは短繊維不織布Ｂを形成するためのものである。短繊維ウエブＡ、Ｂには、それぞれ、前述の短繊維不織布Ａ、Ｂを形成することができる短繊維が使用され、また前述の目付のものが使用される。すなわち、短繊維ウエブＡ、Ｂの目付は、それぞれ、１０〜１５０ｇ／ｍ２であることが好ましく、１５〜１００ｇ／ｍ２であることがより好ましい。 In the method for producing a laminated nonwoven fabric, the short fiber web A is for forming the short fiber nonwoven fabric A, and the short fiber web B is for forming the short fiber nonwoven fabric B. For the short fiber webs A and B, short fibers capable of forming the above-mentioned short fiber nonwoven fabrics A and B are used, respectively, and those having the above-mentioned basis weight are used. That is, the short fiber web A, the basis weight of B, respectively, is preferably 10 to 150 g / m 2, and more preferably 15 to 100 / m 2.
長繊維ウエブの両面に短繊維ウエブを積層し、高圧液体流処理することにより、それぞれの短繊維ウエブの構成繊維同士は交絡一体化することができ、また、両表面層の短繊維ウエブを構成する短繊維同士が、長繊維ウエブを通して絡み付くことにより両表面層の短繊維ウエブと長繊維ウエブとが一体化することができる。
高圧液体流処理としては、例えば、水流交絡処理が挙げられる。水流交絡処理は、公知の方法により行えばよい。すなわち、短繊維ウエブＡ／長繊維ウエブ／短繊維ウエブＢからなる構成に積層し、この積層物をメッシュ状支持体に担持し、次いで、高圧水流を施すことにより、短繊維ウエブ内の構成短繊維同士が三次元的に交絡するとともに、両表面層に存在する短繊維同士が長繊維ウエブを通して互いに絡む。
高圧水流は、例えば、孔径０．０５〜２．０ｍｍの噴射孔が、噴射孔間隔０．０５〜１０ｍｍで、一列又は複数列配置されている噴射装置を用い、１．５〜３０ＭＰａの圧力で、噴射孔から水を噴射することによって得ることができる。
このようにして得られた高圧水流はウエブに衝突して、短繊維に運動エネルギーを与える。この運動エネルギーにより、短繊維ウエブ内の短繊維同士あるいは短繊維ウエブ間の短繊維同士が相互に交絡する。なお、一部の短繊維は、長繊維ウエブを構成する繊維と絡むこともある。
By laminating short fiber webs on both sides of the long fiber web and performing high-pressure liquid flow treatment, the constituent fibers of each short fiber web can be entangled and integrated, and the short fiber web of both surface layers can be constructed. When the short fibers to be entangled with each other through the long fiber web, the short fiber web and the long fiber web of both surface layers can be integrated.
An example of the high-pressure liquid flow process is a hydroentanglement process. The hydroentanglement process may be performed by a known method. That is, a short fiber web A / long fiber web / short fiber web B are laminated to each other, and this laminate is supported on a mesh-like support, and then subjected to a high-pressure water flow, thereby forming a short composition in the short fiber web. The fibers are entangled three-dimensionally, and the short fibers existing in both surface layers are entangled with each other through the long fiber web.
The high-pressure water flow is, for example, a pressure of 1.5 to 30 MPa using an injection device in which injection holes with a hole diameter of 0.05 to 2.0 mm are arranged in one or more rows with an injection hole interval of 0.05 to 10 mm. It can be obtained by injecting water from the injection hole.
The high-pressure water stream thus obtained impinges on the web and gives kinetic energy to the short fibers. Due to this kinetic energy, the short fibers in the short fiber web or the short fibers between the short fiber webs are entangled with each other. Some of the short fibers may be entangled with the fibers constituting the long fiber web.
上記高圧液体流により一体化されたシートは、長繊維ウエブを構成する熱可塑性樹脂が溶融する条件で熱処理される。熱処理温度は、熱可塑性樹脂の融点以上に設定すればよい。熱可塑性樹脂の融点より低い温度で熱処理を行うと長繊維ウエブが十分に溶融せず、長繊維ウエブの形状を保ったままとなり、本発明の目的であるゴシゴシ感のある積層不織布を製造することができない。また熱処理時間は、熱処理温度にもよるが、３０秒〜１分程度でよい。
なお、この熱処理工程は、水流交絡後のシートの乾燥工程と兼ねてもよいし、次工程で行ってもよいが、次工程で行う場合、乾燥工程の熱処理温度は、長繊維ウエブの融点未満で行うことが好ましい。
熱処理工程後、温度が融点以下に降下した長繊維ウエブは固化して、溶融固化物となる。
上記のように、長繊維ウエブを構成する熱可塑性樹脂の融点以上の温度でシートを熱処理することにより、長繊維ウエブは溶融し、次いで固化することにより、短繊維不織布Ａと短繊維不織布Ｂとの間に、熱可塑性樹脂からなる長繊維ウエブの溶融固化物が積層されてなる積層不織布を得ることができる。
The sheet integrated by the high-pressure liquid flow is heat-treated under the condition that the thermoplastic resin constituting the long fiber web is melted. The heat treatment temperature may be set to be equal to or higher than the melting point of the thermoplastic resin. When the heat treatment is performed at a temperature lower than the melting point of the thermoplastic resin, the long fiber web is not sufficiently melted, and the shape of the long fiber web is maintained, and a laminated nonwoven fabric having the harsh feeling that is the object of the present invention is produced. I can't. The heat treatment time may be about 30 seconds to 1 minute, depending on the heat treatment temperature.
In addition, this heat treatment process may be combined with the drying process of the sheet after hydroentanglement, or may be performed in the next process, but in the next process, the heat treatment temperature in the drying process is less than the melting point of the long fiber web. It is preferable to carry out with.
After the heat treatment step, the long fiber web whose temperature has dropped below the melting point solidifies and becomes a melt-solidified product.
As described above, by heat-treating the sheet at a temperature equal to or higher than the melting point of the thermoplastic resin constituting the long fiber web, the long fiber web is melted and then solidified, whereby the short fiber nonwoven fabric A and the short fiber nonwoven fabric B are obtained. In the meantime, it is possible to obtain a laminated nonwoven fabric in which melted and solidified products of long fiber webs made of a thermoplastic resin are laminated.
本発明の積層不織布の用途としては、前述したように、洗顔用シート、ボディ用シート、メイク落とし用シート等が挙げられ、このようなシートは、汚れを落とすためや爽快感を出すために、薬液が含浸されたウェットな状態で用いてもよい。本発明の積層不織布は、ウェットな状態でより強いゴシゴシ感が出るため、好適に使用することができる。
さらに、本発明の積層不織布は、中間層の長繊維ウエブの溶融固化物が熱可塑性樹脂により構成されているため、熱エンボス加工や超音波加工等を施すことによって凹凸を付与することができるので、表面に任意の模様を付与することができる。特に両表面に積層する短繊維不織布として木綿等の天然繊維や再生繊維を用いた場合は、人体に接触する不織布表面に、熱可塑性樹脂が存在しないため、これらの加工によって風合いを損ねることがない。本発明の積層不織布は任意の模様が付与できるため、これを用いて、洗顔用シート、ボディ用シート、メイク落とし用シート等として視覚的に美観を有するものを得ることができる。
As described above, the use of the laminated nonwoven fabric of the present invention includes a face-washing sheet, a body sheet, a makeup-removing sheet, and the like, in order to remove dirt and give a refreshing feeling, You may use it in the wet state impregnated with the chemical | medical solution. The laminated nonwoven fabric of the present invention can be suitably used because it gives a stronger tingling feeling in a wet state.
Furthermore, the laminated nonwoven fabric of the present invention can be provided with irregularities by applying hot embossing or ultrasonic processing, etc., because the melted solidified product of the long fiber web of the intermediate layer is made of a thermoplastic resin. An arbitrary pattern can be given to the surface. In particular, when natural fibers such as cotton or recycled fibers are used as the short fiber nonwoven fabric laminated on both surfaces, there is no thermoplastic resin on the nonwoven fabric surface that comes into contact with the human body. . Since the laminated nonwoven fabric of the present invention can be given an arbitrary pattern, it can be used to obtain a visually pleasing product such as a face-washing sheet, a body sheet, or a makeup-removing sheet.
次に、実施例に基づき本発明を具体的に説明するが、本発明はこれらの実施例にのみ限定されるものではない。なお、実施例、比較例における各種特性値の測定は以下の方法によって実施した。 EXAMPLES Next, the present invention will be specifically described based on examples, but the present invention is not limited only to these examples. In addition, the measurement of the various characteristic values in an Example and a comparative example was implemented with the following method.
（１）目付（ｇ／ｍ２）
ＪＩＳ Ｌ １９０６ 単位面積当たりの質量に記載の方法に基づき測定した。
(1) Weight per unit area (g / m 2 )
Measured based on the method described in JIS L 1906 Mass per unit area.
（２）融点（℃）
パーキンエルマ社製の示差走査熱量計ＤＳＣ−７型を用い、昇温速度を１０℃／分として測定して得た融解吸熱曲線の極値を与える温度を融点（℃）とした。
(2) Melting point (° C)
The temperature which gives the extreme value of the melting endothermic curve obtained by using a differential scanning calorimeter DSC-7 manufactured by Perkin Elma and measuring at a rate of temperature rise of 10 ° C./min was defined as the melting point (° C.).
（３）繊度（デシテックス）
ウエブの状態における繊維径を５０本顕微鏡にて測定し、密度補正して求めた繊度の平均値を繊度（デシテックス）とした。
(3) Fineness (decitex)
The fiber diameter in the state of the web was measured with 50 microscopes, and the average value of the fineness obtained by correcting the density was defined as fineness (decitex).
（４）積層不織布の風合い
下記ウェット状態またはドライ状態とした積層不織布の試料（１０×１０ｃｍ）を用意した。成人男性５名と成人女性５名とに、試料の短繊維不織布Ａの面または短繊維不織布Ｂの面で、自分の腕を拭いてもらい、その拭き心地を下記５段階で評価した。
５：１０人以下８人以上がゴシゴシ感があると感じた。
４：７人以下５人以上がゴシゴシ感があると感じた。
３：４人以下３人以上がゴシゴシ感があると感じた。
２：２人以下１人以上がゴシゴシ感があると感じた。
１：誰もゴシゴシ感があると感じなかった。
ウェット状態：実施例１、２、比較例１〜３にて得られた積層不織布を１０ｃｍ×１０ｃｍの大きさに裁断した試料を純水５００ｍＬが入った１Ｌビーカーに入れ、水分を吸わせた後、手で軽く絞った状態。
ドライ状態：実施例１、２、比較例１〜３にて得られた積層不織布を１０ｃｍ×１０ｃｍの大きさに裁断した試料を１時間、２５℃、６５ＲＨ％下で置いた状態。
(4) Texture of laminated nonwoven fabric A sample of laminated nonwoven fabric (10 × 10 cm) in the following wet state or dry state was prepared. Five adult men and five adult women were asked to wipe their arms on the surface of the short fiber nonwoven fabric A or the short fiber nonwoven fabric B of the sample, and the wiping comfort was evaluated in the following five levels.
5: Fewer than 10 people and 8 people felt tingling.
4: 7 or less 5 or more felt that there was a sense of tingling.
3: Less than 4 people 3 people felt that there was a sense of tingling.
2: Fewer than two people and one or more people felt tingling.
1: No one felt that there was a sense of tingling.
Wet state: After putting the sample obtained by cutting the laminated nonwoven fabrics obtained in Examples 1 and 2 and Comparative Examples 1 to 3 into a size of 10 cm × 10 cm into a 1 L beaker containing 500 mL of pure water and absorbing moisture , Hand squeezed lightly.
Dry state: A state in which a sample obtained by cutting the laminated nonwoven fabric obtained in Examples 1 and 2 and Comparative Examples 1 to 3 into a size of 10 cm × 10 cm was placed at 25 ° C. and 65 RH% for 1 hour.
（５）積層不織布のすべり
上記同様、ウェット状態またはドライ状態とした積層不織布の試料（１０×１０ｃｍ）を用意した。成人男性５名と成人女性５名とに、試料の短繊維不織布Ａの面または短繊維不織布Ｂの面を体にあて、その上に手をおいて体を拭いてもらい、手とそれに接する試料面（体を拭く不織布面の反対側の試料面）とのすべり具合を下記５段階で評価した。
５：１０人以下８人以上がすべりづらいと感じた。
４：７人以下５人以上がすべりづらいと感じた。
３：４人以下３人以上がすべりづらいと感じた。
２：２人以下１人以上がすべりづらいと感じた。
１：すべての人がすべりやすいと感じた。
(5) Sliding of laminated nonwoven fabric As described above, a laminated nonwoven fabric sample (10 × 10 cm) in a wet state or a dry state was prepared. A sample of 5 adult males and 5 adult females touching the surface of the short fiber nonwoven fabric A or the surface of the short fiber nonwoven fabric B on the body and wiping the body with their hands on it The sliding condition with the surface (the sample surface opposite to the non-woven fabric surface for wiping the body) was evaluated in the following five stages.
5: Less than 10 or more than 8 felt it was difficult to slide.
4: 7 or less 5 or more felt that it was difficult to slide.
3: Less than 4 people and 3 people felt it was difficult to slide.
2: Less than 2 people and 1 or more people felt it was difficult to slide.
1: All people felt it was easy to slip.
実施例１
熱可塑性樹脂として、共重合ポリエステル樹脂（テレフタル酸：１，６−ヘキサンジオール：１，４−ブタンジオール＝１００：８５：１５（モル比）、融点１４０℃）を用い、長繊維ウエブとして、７デシテックス、目付３０ｇ／ｍ２の長繊維不織布（スパンボンド不織布）を作成した。
一方、短繊維として、木綿の晒し綿を用い、パラレルカード機にて短繊維ウエブＡとして、目付５０ｇ／ｍ２の不織ウエブを作成し、また、短繊維ウエブＢとして、目付１５ｇ／ｍ２の不織ウエブを作成した。
次いで、短繊維ウエブＡ／長繊維ウエブ／短繊維ウエブＢとなるように積層し、この３層構造の積層物を１００メッシュの金網上に積載した。
孔径０．１ｍｍの噴射孔が孔間隔０．６ｍｍで配置された高圧液体流処理機を用いて、短繊維ウエブＡ側より、４０ｋｇ／ｃｍ２の水圧で１回、６０ｋｇ／ｃｍ２の水圧で１回、また、短繊維ウエブＢ側より、６０ｋｇ／ｃｍ２の水圧で１回、前記３層構造の積層物に液体流を噴射して、高圧液体流処理を施し、積層物を一体化した。その後、得られたシートの過剰な水分の除去のため、１２０℃で乾燥処理を施した。
次いで、乾燥処理を施したシートを、１５０℃で１分間熱処理を行い、本発明の積層不織布を得た。得られた積層不織布の評価結果を表１に示す。
Example 1
A copolymer polyester resin (terephthalic acid: 1,6-hexanediol: 1,4-butanediol = 100: 85: 15 (molar ratio), melting point: 140 ° C.) is used as the thermoplastic resin, and 7 is used as the long fiber web. A long-fiber nonwoven fabric (spunbond nonwoven fabric) having a decitex and a basis weight of 30 g / m 2 was prepared.
On the other hand, using cotton bleached cotton as the short fiber, a non-woven web having a basis weight of 50 g / m 2 is prepared as the short fiber web A by a parallel card machine, and the basis weight is 15 g / m 2 as the short fiber web B. A non-woven web was created.
Subsequently, lamination was performed so that the short fiber web A / long fiber web / short fiber web B were formed, and this three-layer laminate was loaded on a 100-mesh wire mesh.
Using a high-pressure liquid flow treatment machine in which injection holes with a hole diameter of 0.1 mm are arranged with a hole interval of 0.6 mm, from the short fiber web A side, once at a water pressure of 40 kg / cm 2 and at a water pressure of 60 kg / cm 2 . Once, from the short fiber web B side, a liquid flow was sprayed onto the laminate having the three-layer structure once at a water pressure of 60 kg / cm 2 to perform high-pressure liquid flow treatment, and the laminate was integrated. . Thereafter, in order to remove excess moisture from the obtained sheet, a drying treatment was performed at 120 ° C.
Next, the dried sheet was heat treated at 150 ° C. for 1 minute to obtain a laminated nonwoven fabric of the present invention. The evaluation results of the obtained laminated nonwoven fabric are shown in Table 1.
実施例２
短繊維ウエブＡの目付を３０ｇ／ｍ２とした以外は実施例１と同様の条件で、積層不織布を得た。得られた積層不織布の評価結果を表１に示す。
Example 2
A laminated nonwoven fabric was obtained under the same conditions as in Example 1 except that the basis weight of the short fiber web A was 30 g / m 2 . The evaluation results of the obtained laminated nonwoven fabric are shown in Table 1.
比較例１
短繊維ウエブＡと、長繊維ウエブとを用いて、短繊維ウエブＡ／長繊維ウエブとなるように積層し、この２層構造の積層物を１００メッシュの金網上に積載し、また、高圧液体流処理を、短繊維ウエブＡ側より、４０ｋｇ／ｃｍ２の水圧で１回、６０ｋｇ／ｃｍ２の水圧で２回行った以外は実施例２の同様の条件で、積層不織布を得た。得られた積層不織布の評価結果を表１に示す。
Comparative Example 1
The short fiber web A and the long fiber web are laminated so as to be a short fiber web A / long fiber web, and this two-layer structure laminate is loaded on a 100-mesh wire mesh, A laminated nonwoven fabric was obtained under the same conditions as in Example 2 except that the flow treatment was performed once from the short fiber web A side at a water pressure of 40 kg / cm 2 and twice at a water pressure of 60 kg / cm 2 . The evaluation results of the obtained laminated nonwoven fabric are shown in Table 1.
比較例２
短繊維として、木綿の晒し綿を用い、パラレルカード機にて目付５０ｇ／ｍ２の短繊維ウエブを作成した。
得られた短繊維ウエブを１００メッシュの金網上に積載し、４０ｋｇ／ｃｍ２の水圧で１回、６０ｋｇ／ｃｍ２の水圧で２回、前記短繊維ウエブに液体流を噴射して、高圧液体流処理を施した。得られた不織布の過剰な水分の除去のため、１２０℃で乾燥処理を施した。その後、１５０℃で１分間熱処理を行った。得られた不織布の評価結果を表１に示す。
Comparative Example 2
A short fiber web having a weight per unit area of 50 g / m 2 was prepared with a parallel card machine using cotton bleached cotton as the short fiber.
The obtained short fiber web is loaded on a 100-mesh wire net, and a liquid flow is sprayed onto the short fiber web once at a water pressure of 40 kg / cm 2 and twice at a water pressure of 60 kg / cm 2 to obtain a high-pressure liquid. Flow treatment was applied. In order to remove excess moisture from the obtained nonwoven fabric, a drying treatment was performed at 120 ° C. Thereafter, heat treatment was performed at 150 ° C. for 1 minute. The evaluation results of the obtained nonwoven fabric are shown in Table 1.
比較例３
短繊維として、木綿の晒し綿と、ポリエステル繊維（融点２５６℃、２．２デシテックス、３８ｍｍ）とを用い、７０：３０となるように混合し、パラレルカード機にて目付５０ｇ／ｍ２の短繊維ウエブを作成した。
得られた短繊維ウエブを用いた以外は、比較例２と同様の条件で、不織布を得た。得られた不織布の評価結果を表１に示す。
Comparative Example 3
As short fibers, cotton-bleached cotton and polyester fibers (melting point 256 ° C., 2.2 dtex, 38 mm) are mixed so as to be 70:30, and the basis weight is 50 g / m 2 with a parallel card machine. A fiber web was prepared.
A nonwoven fabric was obtained under the same conditions as in Comparative Example 2 except that the obtained short fiber web was used. The evaluation results of the obtained nonwoven fabric are shown in Table 1.
実施例１〜２の積層不織布は、肌触りの良好さを保持し、かつゴシゴシ感があり、快適な拭き心地であった。
比較例１の積層不織布は、一方の表面に長繊維ウエブの溶融固化物が現れているため、この表面は、すべりにくいものであったが、肌に触れる用途のワイパーとして使用することができず、またアレルギーがある人は使用できないものであった。
比較例２の不織布は、柔らかい拭き心地ではあるものの、ゴシゴシ感は得られなかった。
比較例３の不織布は、比較例２のものよりも強い拭き心地ではあったが、実施例のものと比較すると、ゴシゴシ感は得られなかった。また、この不織布は、皮膚に触れる所に合成繊維があるので、アレルギーがある人は使用できないものであった。
The laminated nonwoven fabrics of Examples 1 and 2 maintained good touch and had a feeling of tingling, and were comfortable to wipe.
In the laminated nonwoven fabric of Comparative Example 1, since the melted and solidified product of the long fiber web appears on one surface, this surface was difficult to slip, but could not be used as a wiper for applications that touch the skin. Also, those who have allergies could not use it.
Although the nonwoven fabric of Comparative Example 2 had a soft wiping feeling, it did not give a tingling sensation.
The non-woven fabric of Comparative Example 3 had a stronger wiping comfort than that of Comparative Example 2, but no gritty feeling was obtained when compared with the Example. In addition, this nonwoven fabric cannot be used by people with allergies because it has synthetic fibers in contact with the skin.
Claims (1)
高圧液体流を用いた繊維同士の交絡処理によりこれらを一体化した後、
得られたシートを、長繊維ウエブを構成する熱可塑性樹脂の融点以上の温度であり、かつ短繊維ウエブが溶融しない温度あるいは短繊維ウエブが熱の影響を受けない温度で熱処理して、熱可塑性樹脂からなる長繊維ウエブを溶融した後、前記熱可塑性樹脂を長繊維ウエブの形状が保たれていない不定形に固化することにより、
熱可塑性樹脂からなる不定形の溶融固化物を、短繊維ウエブＡから形成された短繊維不織布Ａと、短繊維ウエブＢから形成された短繊維不織布Ｂとの間に積層することを特徴とする積層不織布の製造方法。 Laminating a short fiber web A on one surface of the long fiber web made of thermoplastic resin, stacking the short fiber web B on the other surface,
After unifying these by entanglement treatment between fibers using a high-pressure liquid flow,
The obtained sheet is heat treated at a temperature not lower than the melting point of the thermoplastic resin constituting the long fiber web and at a temperature at which the short fiber web does not melt or at a temperature at which the short fiber web is not affected by heat. After melting the long fiber web made of resin, by solidifying the thermoplastic resin into an indefinite shape in which the shape of the long fiber web is not maintained ,
An amorphous melt-solidified product made of a thermoplastic resin is laminated between a short fiber nonwoven fabric A formed from the short fiber web A and a short fiber nonwoven fabric B formed from the short fiber web B. A method for producing a laminated nonwoven fabric.
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