JP2007020787A - Nonwoven fabric for body warmer, and disposable body warmer - Google Patents
Nonwoven fabric for body warmer, and disposable body warmer Download PDFInfo
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本発明は使い捨てカイロ用不織布に関し、さらに詳しくは、肌触り、耐摩耗性、柔軟性の優れ、且つ、カイロ生産加工時の寸法安定性に優れたカイロ用不織布および、使い捨てカイロに関する。 The present invention relates to a nonwoven fabric for disposable body warmers, and more particularly to a nonwoven fabric for body warmers and a disposable body warmer that are excellent in touch, wear resistance, flexibility and dimensional stability during warmer production processing.
従来、使い捨てカイロ分野、例えば、揉むカイロ、貼るカイロ等にスパンボンド不織布が、発熱組成物の包材として使用されている。特に、ポリアミドのスパンボンド不織布は、強度、柔軟性、耐熱性、寸法安定性などに優れているが、薄い感じでふくらみ感が不足するため、嵩高で、ソフトな感触性、肌触り性の向上が要望されている。
特許文献１には、潜在捲縮発現性ポリエステル複合繊維不織布を熱処理によって捲縮発現させ、医療用の「貼るカイロ」として、身体のフイット性が良く、保温効果に優れている使い捨てカイロが記載されているが、不織布自体が伸縮性を有するため、カイロへの生産加工時に、不織布の伸びが生じ、寸法安定性、加工安定性の低下が問題となる。
特許文献２には、セルロース系短繊維を水流交絡で製造した不織布が、肌触り、保水性に優れたカイロ用表面材が記載されている。しかし、この表面材は、水流交絡不織布を用いるので、肌触りが良いが、強度の問題や、カイロへの生産加工時に不織布の伸びや幅入りが生じやすく、加工時の寸法安定性が低下するという問題がある。
特許文献３には、柔軟で繊維触感を持ちながら、発熱体の熱を有効に活かす、保温効率の良好な使い捨て保温具が記載されている。しかしながら、この保温具は、嵩高性、柔軟性には優れているが、加工時の寸法安定性の低下、耐磨耗性の低下等の問題がある。
Patent Document 1 describes a disposable warmer that has a crimped appearance of a latent crimpable polyester composite fiber nonwoven fabric by heat treatment and has a good body fit and excellent heat retention effect as a medical “sticking warmer”. However, since the nonwoven fabric itself has stretchability, the nonwoven fabric is stretched during production and processing into a warmer, resulting in a problem of reduced dimensional stability and processing stability.
Patent Document 2 describes a warmer surface material in which a nonwoven fabric produced by hydroentangling cellulose-based short fibers is soft to the touch and has excellent water retention. However, this surface material uses a hydroentangled nonwoven fabric, so it feels good, but there is a problem of strength, and the nonwoven fabric tends to stretch and width during production processing to Cairo, and the dimensional stability during processing is reduced. There's a problem.
Patent Document 3 describes a disposable warmer with good heat retention efficiency that makes effective use of heat of a heating element while having a soft and tactile feel. However, this warmer is excellent in bulkiness and flexibility, but has problems such as a decrease in dimensional stability during processing and a decrease in wear resistance.
本発明の課題は、上記従来技術の問題点を解決し、カイロへの生産加工時の寸法安定性が良好であり、立毛感がありソフトな感触を有し、柔軟性、肌触り性、及び耐摩耗性などに優れたカイロ用不織布及び、使い捨てカイロを提供することである。 An object of the present invention is to solve the above-mentioned problems of the prior art, have good dimensional stability during production processing on a warmer, have a feeling of napping and have a soft feel, flexibility, touch and resistance. An object is to provide a warmer nonwoven fabric and a disposable warmer that are excellent in wear and the like.
本発明者は、上記課題を解決すべく、鋭意検討した結果、熱可塑性合成長繊維不織布と短繊維不織布とを特定割合で積層し、流体交絡で一体化複合させることで、カイロ生産加工時の寸法安定性、耐摩耗性、柔軟性、肌触り性に優れたカイロ用不織布を得ることを見出し本発明に到達したものである。
上記課題を達成するために本願で特許請求される発明は以下の通りである。
As a result of intensive studies to solve the above-mentioned problems, the present inventors laminated thermoplastic synthetic long-fiber nonwoven fabrics and short-fiber nonwoven fabrics at a specific ratio and integrated and combined them by fluid entanglement, so that during the warming production process The present inventors have found that a nonwoven fabric for warmers having excellent dimensional stability, wear resistance, flexibility, and touch is obtained, and has reached the present invention.
The invention claimed in the present application in order to achieve the above object is as follows.
（１）目付が８〜50g/m2、平均繊維径が7〜30μmの熱可塑性長繊維不織布層（Ａ）の少なくとも片面に、目付け20〜70g/m2、平均繊維径が7〜30μmの短繊維ウエブ層（Ｂ）を積層し、流体交絡一体化した複合不織布であって、該複合不織布の目付けが30〜120g/m2、５%伸張時の応力の目付け換算値がタテ0.5N／5cm以上、ヨコ0.05N／5cm以上、5N／5cm荷重時の幅入り率が10%以下であることを特徴とするカイロ用不織布。
（２）前記複合不織布における前記長繊維ウェブ層(Ａ)と短繊維ウェブ層(B)の重量比A：Bが、(１０〜６０)：(９０〜４０)であることを特徴とする上記（１）に記載のカイロ用不織布。
（３）前記複合不織布の嵩密度が0.10〜0.25g/cm3であることを特徴とする上記（１）又は（２）に記載のカイロ用不織布。
（４）前記熱可塑性長繊維不織布層の透水量が100L/m2・sec以上であることを特徴とする上記（１）〜（３）のいずれかに記載のカイロ用不織布。
（５）前記複合不織布の厚み変化量が0.05〜0.5mmであることを特徴とする上記（１）〜（４）のいずれかに記載のカイロ用不織布。
（６）前記短繊維ウェブ層が、ポリエステル短繊維と低融点繊維が混合していることを特徴とする上記（１）〜（５）のいずれかに記載のカイロ用不織布。
（７）前記熱可塑性長繊維不織布層が、ポリアミド長繊維、ポリエステル長繊維、脂肪族ポリエステル長繊維、およびポリプロピレン長繊維から選ばれる少なくとも一つからなることを特徴とする上記（１）〜（６）のいずれかに記載のカイロ用不織布。
（８）上記（１）〜（７）のいずれかに記載のカイロ用不織布に熱可塑性樹脂フイルムとを、ラミネートした通気性を有する包材と、該包材に収容された、空気の存在下で発熱する発熱組成物とを有することを特徴とする使い捨てカイロ。
(1) The basis weight is 20 to 70 g / m 2 and the average fiber diameter is 7 to 30 μm on at least one surface of the thermoplastic long-fiber nonwoven fabric layer (A) having a basis weight of 8 to 50 g / m 2 and an average fiber diameter of 7 to 30 μm. A composite nonwoven fabric in which short fiber web layers (B) are laminated and fluid entangled and integrated, and the basis weight of the composite nonwoven fabric is 30 to 120 g / m 2 , and the basis weight conversion value of stress at 5% elongation is vertical 0.5 N / A non-woven fabric for warmers characterized by having a width entering rate of 5 cm or more, a width of 0.05 N / 5 cm or more, and a load of 5 N / 5 cm at a load of 10% or less.
(2) The weight ratio A: B of the long fiber web layer (A) and the short fiber web layer (B) in the composite nonwoven fabric is (10-60) :( 90-40) The nonwoven fabric for warmers as described in (1).
(3) The bulk density of the composite nonwoven fabric is 0.10 to 0.25 g / cm 3 , wherein the nonwoven fabric for warmers according to the above (1) or (2).
(4) The nonwoven fabric for warmers according to any one of (1) to (3) above, wherein a water permeability of the thermoplastic long-fiber nonwoven fabric layer is 100 L / m 2 · sec or more.
(5) The nonwoven fabric for warmers according to any one of (1) to (4) above, wherein the composite nonwoven fabric has a thickness variation of 0.05 to 0.5 mm.
(6) The nonwoven fabric for warmers according to any one of (1) to (5), wherein the short fiber web layer is a mixture of polyester short fibers and low melting point fibers.
(7) The thermoplastic long fiber nonwoven fabric layer is made of at least one selected from polyamide long fibers, polyester long fibers, aliphatic polyester long fibers, and polypropylene long fibers, (1) to (6) The nonwoven fabric for warmers according to any one of (1).
(8) Breathable packaging material obtained by laminating a thermoplastic resin film on the warmer nonwoven fabric according to any one of (1) to (7) above, and in the presence of air contained in the packaging material A disposable body warmer comprising a heat-generating composition that generates heat at a temperature.
本発明のカイロ用不織布は、熱可塑性長繊維不織布に短繊維ウェブを特定重量割合で積層して、流体交絡処理にて一体複合化したものである。その結果、複合不織布の５％伸張時の抗張力が大きく、伸びにくい特性を有し、荷重時の寸法安定性が良好であり、5N/5cm荷重時の幅入り率が１０％以下であり、カイロの生産加工における不織布の搬送工程での寸法安定性が極めて良好である。
さらに、長繊維と短繊維が流体交絡されているため、耐磨耗性、柔軟性、肌触り性、保温性に優れている。しかも、外表面を短繊維層側とすることにより、嵩高でフエルト状の外観を有し、表面に立毛を有するためソフトな触感を有し、外観品位と触感に優れた包材とすることができる。この包材に発熱組成物を充填することによって、使い捨ての揉むカイロ、または片面に粘着剤を塗布した貼るカイロとすることができる。
The nonwoven fabric for warmers of the present invention is obtained by laminating a short fiber web at a specific weight ratio on a thermoplastic long fiber nonwoven fabric and integrally compositing it by fluid entanglement treatment. As a result, the composite nonwoven fabric has high tensile strength when stretched by 5% and is difficult to stretch, has good dimensional stability when loaded, and has a width ratio of 10% or less when loaded with 5N / 5cm. The dimensional stability of the nonwoven fabric in the production process is very good.
Furthermore, since the long fibers and the short fibers are fluidly entangled, they are excellent in wear resistance, flexibility, touch and heat retention. Moreover, by making the outer surface the short fiber layer side, it has a bulky and felt-like appearance, has a raised surface on the surface, has a soft tactile sensation, and has excellent appearance quality and tactile sensation. it can. By filling the packaging material with the exothermic composition, it can be a disposable warmer or a warmer coated with an adhesive on one side.
本発明の不織布は、熱可塑性長繊維不織布と、短繊維ウェブ層とが、流体交絡で一体化した複合不織布であり、好ましくは、構成繊維が緻密化されて配列している熱可塑性長繊維不織布と、嵩高で疎な構造を有する短繊維ウェブ層とが、流体交絡で一体化した複合不織布である。
本発明の複合不織布の構造的特徴は、連続フイラメントが積層されて部分熱圧着で表裏一体化接合された緻密構造を有する熱可塑性合成長繊維不織布と、繊維長が10mm〜100mmの範囲である短繊維ウェブとが、液体交絡で三次元に渡って交絡して一体化されていることである。このような構造では、長繊維不織布の繊維間隙に短繊維が入り込み、不織布の厚み方向に渡って長繊維と短繊維が絡み、容易に短繊維が脱落し難くなる。
このため、複合不織布の断面は粗密の構造となり、密な構造の長繊維の表面に粗な構造の立毛した短繊維が長繊維と交絡して存在する構造となる。従って、得られた複合不織布は、表面が立毛状態であり、柔軟性、肌触り性、耐磨耗性に優れ、カイロ生産加工工程、例えば発熱材料の製袋加工工程等の走行張力に対し、幅入りが極めて少なく、寸法安定性に優れたものとなる。また、使い捨てカイロとして使用した場合、手で揉む操作を繰り返しても、短繊維の脱落が少なく、磨耗時の耐毛羽立ち性も優れている。
The nonwoven fabric of the present invention is a composite nonwoven fabric in which a thermoplastic long fiber nonwoven fabric and a short fiber web layer are integrated by fluid entanglement, and preferably a thermoplastic long fiber nonwoven fabric in which constituent fibers are densified and arranged. And a composite nonwoven fabric in which short fiber web layers having a bulky and sparse structure are integrated by fluid entanglement.
The structural features of the composite nonwoven fabric of the present invention include a thermoplastic synthetic long-fiber nonwoven fabric having a dense structure in which continuous filaments are laminated and front and back are integrally joined by partial thermocompression bonding, and a short fiber length in the range of 10 mm to 100 mm. The fiber web is entangled and integrated in three dimensions by liquid entanglement. In such a structure, the short fibers enter the fiber gaps of the long fiber nonwoven fabric, the long fibers and the short fibers are entangled in the thickness direction of the nonwoven fabric, and the short fibers are not easily dropped off.
For this reason, the cross section of the composite nonwoven fabric has a dense structure, and has a structure in which short fibers having a rough structure are entangled with the long fibers on the surface of the long fibers having a dense structure. Therefore, the obtained composite non-woven fabric has a raised surface, is excellent in flexibility, touch and wear resistance, and has a width against running tension in a warmer production process, for example, a bag forming process of a heat generating material. Very little penetration and excellent dimensional stability. In addition, when used as a disposable body warmer, even if the operation of squeezing by hand is repeated, the short fibers do not fall out and the fuzz resistance during wear is excellent.
本発明における長繊維不織布は、目付が8〜50g/m2 、好ましくは15〜40g/m2の範囲であり、平均繊維径は7〜30μm、好ましくは、10〜25μmの範囲である。目付けが8g/m2より少ないと、強度や、寸法安定性が低下するし、50g/m2を超えると繊維構造が緻密になり過ぎ、流体交絡性が低下するという問題が起きる。平均繊維径が7μmよりも小さいと、強度が低下し、緻密な構造になりすぎ、流体交絡性が低下し、30μmを超えると、繊維が太くなりすぎ、柔軟性が低下する。
熱可塑性長繊維不織布の嵩密度は0.1〜0.3g/cm3の範囲であり、短繊維ウェブの嵩密度は0.001〜0.06g/cm3の範囲であり、複合不織布全体としての嵩密度は0.1〜0.25g/cm3の範囲であることが好ましい。
The long fiber nonwoven fabric in the present invention has a basis weight of 8 to 50 g / m 2 , preferably 15 to 40 g / m 2 , and an average fiber diameter of 7 to 30 μm, preferably 10 to 25 μm. When the basis weight is less than 8 g / m 2 , the strength and dimensional stability are lowered, and when it exceeds 50 g / m 2 , the fiber structure becomes too dense and the fluid entanglement is lowered. When the average fiber diameter is smaller than 7 μm, the strength is lowered and the structure becomes too dense and the fluid entanglement is lowered. When the average fiber diameter exceeds 30 μm, the fiber becomes too thick and the flexibility is lowered.
The bulk density of the thermoplastic filament nonwoven fabric is in the range of 0.1 to 0.3 g / cm 3, the bulk density of the short fiber web is in the range of 0.001~0.06g / cm 3, bulk density 0.1 overall composite nonwoven fabric The range is preferably 0.25 g / cm 3 .
長繊維不織布を構成する繊維としては、熱可塑性合成繊維であり、ポリエチレン、ポリプロピレン、共重合ポリプロピレンなどのポリオレフイン系繊維、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、共重合ポリエステルなどのポリエステル系繊維、ナイロン-6、ナイロン-66、共重合ナイロンなどのポリアミド系繊維、鞘がポリエチレン、ポリプロピレン、共重合ポリエステル、芯がポリプロピレン、ポリエステルなどの組み合わせから成る芯鞘構造等の複合繊維、ポリ乳酸、ポリブチレンサクシネート、ポリエチレンサクシネートなどの生分解性繊維などの繊維などが用いられる。繊維としては、単独でもよく、又２種以上の繊維を積層して用いることもできる。繊維の断面形状としては、丸型、及び扁平型、C型、Y型、V型などの異形断面などが用いられる。 The fibers constituting the long-fiber nonwoven fabric are thermoplastic synthetic fibers, polyolefin fibers such as polyethylene, polypropylene and copolymer polypropylene, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and copolymer polyester, Polyamide fibers such as nylon-6, nylon-66, copolymer nylon, etc., composite fibers such as a core-sheath structure consisting of a combination of polyethylene, polypropylene, copolyester, cores, polypropylene, polyester, etc., polylactic acid, polybutylene Fibers such as biodegradable fibers such as succinate and polyethylene succinate are used. As the fiber, it may be used alone, or two or more kinds of fibers may be laminated and used. As a cross-sectional shape of the fiber, a round shape, a deformed cross-section such as a flat shape, a C shape, a Y shape, a V shape, or the like is used.
本発明における長繊維不織布の製造は、従来公知のスパンボンド法が好ましく用いられる。得られる不織布の部分熱圧着率は5〜30%、好ましくは7〜25%の範囲であることが、強度、寸法安定性、及び流体交絡性などの点から好ましい。部分熱圧着率がこの範囲を外れると、強度、寸法安定性、及び流体交絡性が低下する。
流体交絡性を考慮すると、部分熱圧着部は流体の透過を阻害するため、熱圧着部としては、１個ごとに比較的小さな面積で、均等に、狭い間隔で分布していることが好ましい、例えば、1個あたりの面積が0.1〜10mm2、間隔が1〜15mmであることが好ましい。
流体交絡において、長繊維不織布の透水性は100L/m2・sec以上が好ましく、より好ましくは150〜500L/m2・secである。透水性がこの範囲にあると、流体交絡時の流体の透過性がよく、さらに、真空による脱液性も良好となる。
なお、本発明において、流体交絡とは、例えば、高圧水流を用いた水流交絡が挙げられる。
For production of the long-fiber nonwoven fabric in the present invention, a conventionally known spunbond method is preferably used. The partial thermocompression rate of the obtained nonwoven fabric is preferably 5 to 30%, preferably 7 to 25% from the viewpoint of strength, dimensional stability, fluid entanglement, and the like. When the partial thermocompression bonding rate is out of this range, the strength, dimensional stability, and fluid entanglement deteriorate.
In consideration of fluid entanglement, since the partial thermocompression bonding part impedes the permeation of the fluid, it is preferable that the thermocompression bonding parts are uniformly distributed at a narrow interval with a relatively small area for each one. For example, the area per piece is preferably 0.1 to 10 mm 2 and the interval is preferably 1 to 15 mm.
In fluid entanglement, the water permeability of the long-fiber nonwoven fabric is preferably 100 L / m 2 · sec or more, more preferably 150 to 500 L / m 2 · sec. When the water permeability is within this range, the fluid permeability at the time of fluid entanglement is good, and the liquid removal property by vacuum is also good.
In the present invention, fluid entanglement includes, for example, water entanglement using a high-pressure water flow.
本発明における短繊維ウェブは、目付が20〜70g/m2 、好ましくは25〜60g/m2であり、
平均繊維径が7〜30μm、好ましくは、10〜25μmである。目付けが20g/m2より小さいと、強度や、目付の均一性が低下し、70g/m2超えると繊維構造が嵩高になり、流体交絡性が低下する。平均繊維径が7μmより小さいと、強度が低下し、緻密な構造となりやすく流体交絡性が低下し、30μmを超えると柔軟性が低下する。
短繊維を構成する繊維としては、カイロ用包材として使用する場合、発熱組成物に含まれる水分を吸水しない素材が適切であり、疎水性繊維を主体に構成することが好ましい。なお、レーヨン繊維、その他セルロース繊維、天然繊維などの親水性繊維は、発熱組成物中の含有水分に影響を与えない程度に混合してもよい。
親水性繊維を含有した短繊維ウェブは、カイロ用包材の外表面に用いると、発熱組成物中の含有水分への影響を減少できるので好ましい。
The short fiber web in the present invention has a basis weight of 20 to 70 g / m 2 , preferably 25 to 60 g / m 2 ,
The average fiber diameter is 7 to 30 μm, preferably 10 to 25 μm. When the basis weight is less than 20 g / m 2 , the strength and the uniformity of the basis weight decrease, and when the basis weight exceeds 70 g / m 2 , the fiber structure becomes bulky and fluid entanglement decreases. When the average fiber diameter is smaller than 7 μm, the strength is lowered, and a dense structure tends to be obtained, and the fluid entanglement is lowered, and when it exceeds 30 μm, the flexibility is lowered.
As the fiber constituting the short fiber, when used as a packaging material for a warmer, a material that does not absorb moisture contained in the exothermic composition is suitable, and it is preferable that the short fiber is mainly composed of hydrophobic fibers. In addition, you may mix hydrophilic fibers, such as rayon fiber, another cellulose fiber, and a natural fiber, to such an extent that the moisture content in a heat-generating composition is not affected.
A short fiber web containing hydrophilic fibers is preferably used on the outer surface of the packaging material for warmers because the influence on the moisture content in the exothermic composition can be reduced.
熱可塑性合成繊維としては、ポリエチレン、ポリプロピレン、共重合ポリプロピレンなどのポリオレフイン系繊維、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、共重合ポリエステルなどのポリエステル系繊維、ナイロン-6、ナイロン-66、共重合ナイロンなどのポリアミド系繊維、鞘がポリエチレン、ポリプロピレン、共重合ポリエステル、芯がポリプロピレン、ポリエステルなどの組み合わせから成る芯鞘構造等の複合繊維、ポリ乳酸、ポリブチレンサクシネート、ポリエチレンサクシネートなどの生分解性繊維などの繊維などが用いられる。セルロース系の短繊維ウェブでもよく、コットン、レーヨン、リオセル、キュプラ、ポリノジック等が好適である。 As thermoplastic synthetic fibers, polyolefin fibers such as polyethylene, polypropylene, copolymerized polypropylene, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, copolymerized polyester, nylon-6, nylon-66, copolymerized Biodegradation of polyamide-based fibers such as nylon, sheaths of polyethylene, polypropylene, copolyester, core-sheathed composite fibers composed of combinations of polypropylene, polyester, etc., polylactic acid, polybutylene succinate, polyethylene succinate, etc. A fiber such as a reactive fiber is used. A cellulose-based short fiber web may be used, and cotton, rayon, lyocell, cupra, polynosic and the like are suitable.
繊維の種類としては、単独でもよく、又２種以上の繊維を積層、混合して用いることもできる。特に、低融点繊維との混合繊維で結合が向上でき、またレーヨン繊維、セルロース繊維等の親水性繊維との混繊で、肌触り性、吸水性などが向上でき、混合比率30重量%以下で好ましく用いられる。
短繊維の繊維長は、10〜100mmが好ましく、より好ましくは、20〜80mmである。繊維長が10mmより短いと、カードウエブの開繊性が低下する、一方100mmを超えると、長繊維との絡み性が低下する。
本発明における短繊維ウェブ層の製造は、従来公知のカード法などの開繊処理をし、クロスレイヤーの積層でウッブを形成することにより行なわれる。なお、ウェブ形成後、必要に応じて、ニードルパンチ機などの交絡を施してもよい。
The type of fiber may be single, or two or more types of fibers may be laminated and mixed. In particular, it is possible to improve the binding with a mixed fiber with a low-melting fiber, and it is possible to improve the touch, water absorption, etc. by mixing with a hydrophilic fiber such as rayon fiber or cellulose fiber, and the mixing ratio is preferably 30% by weight or less. Used.
The fiber length of the short fiber is preferably 10 to 100 mm, and more preferably 20 to 80 mm. When the fiber length is shorter than 10 mm, the opening property of the card web is lowered. On the other hand, when the fiber length exceeds 100 mm, the entanglement property with the long fiber is lowered.
The short fiber web layer in the present invention is produced by performing a fiber opening process such as a conventionally known card method and forming a web by laminating cross layers. In addition, after web formation, you may entangle with a needle punch machine etc. as needed.
本発明における複合不織布は、長繊維不織布層(A)と短繊維ウェブ層(B)の重量比Ａ：Ｂが(１０〜６０)：(９０〜５０)であり、好ましくは、(１５〜５５)：(８５〜４５)、より好ましくは、(２０〜５０)：(８０〜５０)である。
Ａ層が10重量%未満では（Ｂ層が90重量%を超えると）Ｂ層の割合が多くなり、柔軟性、肌触り性が良いが、強度、寸法安定性が低下する。一方、Ａ層が６０重量%を超えると、強度、寸法安定性が良いが、柔軟性、肌触り性が低下する。
In the composite nonwoven fabric in the present invention, the weight ratio A: B of the long fiber nonwoven fabric layer (A) and the short fiber web layer (B) is (10-60) :( 90-50), preferably (15-55 ): (85-45), more preferably (20-50): (80-50).
When the A layer is less than 10% by weight (when the B layer exceeds 90% by weight), the proportion of the B layer increases, and the flexibility and the touch are good, but the strength and the dimensional stability are lowered. On the other hand, when the A layer exceeds 60% by weight, the strength and dimensional stability are good, but the flexibility and the touch are lowered.
本発明における流体交絡の複合方法は、公知のスパンレース加工機が採用される。例えば長繊維不織布層の上に、少なくとも片面に短繊維ウエブ層を積層させ、金網製、ポリエステル繊維製などの網目を有するネット状の多孔性支持体上に設置してから、加圧流体を噴射ノズルから噴射して、流体交絡させる。
噴射ノズルの孔径は、0.05〜2.0mm、好ましくは0.1〜0.5mm、噴射ノズル間隔は0.2〜10mm、好ましくは0.3〜5mmであり、噴射圧は0.5Mpa〜15Mpa、好ましくは1Mpa〜12Mpaであり、噴射ノズルと、多孔性支持体との間隔は、1〜15cm、好ましくは2〜10cmである。
A known spunlace processing machine is used for the fluid entanglement composite method in the present invention. For example, a short fiber web layer is laminated on at least one side on a long fiber nonwoven fabric layer, placed on a net-like porous support having a mesh such as a metal mesh or polyester fiber, and then a pressurized fluid is injected. The fluid is entangled by ejecting from the nozzle.
The hole diameter of the injection nozzle is 0.05 to 2.0 mm, preferably 0.1 to 0.5 mm, the injection nozzle interval is 0.2 to 10 mm, preferably 0.3 to 5 mm, and the injection pressure is 0.5 Mpa to 15 Mpa, preferably 1 Mpa to 12 Mpa. The distance between the spray nozzle and the porous support is 1 to 15 cm, preferably 2 to 10 cm.
本発明における流体交絡は、長繊維不織布の水の透水量が大きいことが、液流の透過性が良好であり、真空脱水を行う上でも好ましい。例えば、長繊維不織布の透水量が100L/m2・sec以上、好ましくは150〜500L/m2・secである。透水特性が大きくなると、長繊維不織布自体が透水しやすくなり、噴射ノズルからの流水が通過し易くなる。一方、透水性が低い場合、透水し難くなり、噴射ノズルの水が不織布表面で跳ね返り、流体交絡性が低下する。
本発明に用いる流体交絡において、多孔質支持体上に長繊維不織布と短繊維ウェブを積層し、短繊維ウェブの上面から、加圧流体を噴射させ、多孔質支持体の下面から、スリット状の真空装置を用いて、脱液することにより、スムーズな流体交絡ができる。
In the fluid entanglement in the present invention, it is preferable that the long-fiber nonwoven fabric has a large water permeation amount because the liquid flow is good and vacuum dehydration is performed. For example, water permeability of the long-fiber nonwoven fabric is 100L / m 2 · sec or more, preferably 150~500L / m 2 · sec. When the water permeability is increased, the long-fiber nonwoven fabric itself is easy to permeate, and the flowing water from the spray nozzle easily passes. On the other hand, when water permeability is low, it becomes difficult to permeate, and the water of a jet nozzle rebounds on the nonwoven fabric surface, and fluid entanglement falls.
In the fluid entanglement used in the present invention, a long fiber nonwoven fabric and a short fiber web are laminated on a porous support, and a pressurized fluid is sprayed from the upper surface of the short fiber web. Smooth fluid entanglement can be achieved by removing liquid using a vacuum apparatus.
本発明における複合不織布の目付けは、30〜120g/m2、好ましくは35〜100g/m2、より好ましくは、40〜80g/m2である。目付け30g/m2未満では、強度、寸法安定性が低下する、一方120g/m2を超えると、強度、寸法安定性が良いが、柔軟性が低下する。 The basis weight of the composite nonwoven fabric in the present invention is 30 to 120 g / m 2 , preferably 35 to 100 g / m 2 , more preferably 40 to 80 g / m 2 . If the basis weight is less than 30 g / m 2 , the strength and dimensional stability are lowered. On the other hand, if it exceeds 120 g / m 2 , the strength and dimensional stability are good, but the flexibility is lowered.
本発明における複合不織布の嵩密度は、0.10〜0.25g/cm3、好ましくは、0.12〜0.23g/cm3であり、特に好ましくは、0.15〜0.21g/cm3の範囲である。
嵩密度が0.10g/cm3未満では、繊維密度が低下し、耐磨耗性、寸法安定性が低下し、一方、0.25g/cm3を超えると繊維密度が高くなり、耐磨耗性、寸法安定性が良くなるが、柔軟性が低下する
The bulk density of the composite nonwoven fabric of the present invention, 0.10~0.25g / cm 3, preferably a 0.12~0.23g / cm 3, particularly preferably in the range of 0.15~0.21g / cm 3.
When the bulk density is less than 0.10 g / cm 3 , the fiber density decreases, wear resistance and dimensional stability decrease, while when it exceeds 0.25 g / cm 3 , the fiber density increases and wear resistance, Dimensional stability improves, but flexibility decreases
本発明における複合不織布の剥離強度は、長繊維層と、短繊維ウェブ層の流体交絡状態によって定まり、剥離強度が大きいことは、交絡接合が強固に行われていることを表す。該剥離強度は、0.5N／5cm以上、好ましくは、1N／5cm以上である。
本発明の複合不織布の表面は毛羽立ち状態において、短繊維と長繊維の交絡が強固に行われており、耐摩耗性が３級以上、好ましくは、３．５級以上である。耐摩耗性は、JIS-L-1906の学振摩擦強度測定方法で、荷重250g、摩擦子にモス織物を付け、100回摩耗させて判定する。耐磨耗性３級以上では、磨耗による毛羽立ちが殆ど無く、良好な磨耗性を有する。耐摩耗性が３級未満では、磨耗による毛羽の発生、繊維の脱落が多くなる。
The peel strength of the composite nonwoven fabric in the present invention is determined by the fluid entanglement state of the long fiber layer and the short fiber web layer, and a large peel strength indicates that the entanglement joining is firmly performed. The peel strength is 0.5 N / 5 cm or more, preferably 1 N / 5 cm or more.
The surface of the composite nonwoven fabric of the present invention is strongly entangled with short fibers and long fibers in a fuzzy state, and has an abrasion resistance of 3 or more, preferably 3.5 or more. Abrasion resistance is determined by JIS-L-1906's Gakushin friction strength measurement method, with a load of 250 g, a moss fabric attached to the friction element, and worn 100 times. In the abrasion resistance grade 3 or higher, there is almost no fuzz due to wear, and the wear resistance is good. When the wear resistance is less than the third grade, the generation of fluff due to wear and the loss of fibers increase.
本発明における複合不織布の寸法安定性を示す指標として、5%伸張時の中間応力の目付け換算値を用い、中間応力（Ｎ）／目付け（ｇ／ｍ2）で求めることができる。不織布の伸びにくさを示すものであり、数値が大きいほど寸法安定性が良好といえる。本発明の複合不織布の5%伸張時の中間応力の目付け換算値のタテ方向の値は、0.5N／5cm以上、ヨコ0.05N／5cmであり、好ましくはタテ0.7N／5cm以上、ヨコ0.07N／5cm以上であり、より好ましくはタテ1.0N／5cm以上、ヨコ0.10N／5cmである。
更に、カイロの生産加工時の加工安定性を示す指標として、例えば発熱材料の製袋工程等を想定して、不織布に一定荷重を掛けた時の不織布の幅入り率が少ないことが挙げられる。
As an index indicating the dimensional stability of the composite nonwoven fabric in the present invention, it can be obtained by intermediate stress (N) / weight per unit area (g / m 2 ) using a basis weight conversion value of intermediate stress at 5% elongation. This indicates the difficulty of stretching the nonwoven fabric, and the larger the value, the better the dimensional stability. The value in the vertical direction of the basis weight conversion value of the intermediate stress at the time of 5% elongation of the composite nonwoven fabric of the present invention is 0.5 N / 5 cm or more, horizontal 0.05 N / 5 cm, preferably vertical 0.7 N / 5 cm or more, horizontal 0.07 N / 5cm or more, more preferably, the length is 1.0N / 5cm or more, and the width is 0.10N / 5cm.
Furthermore, as an index indicating the processing stability at the time of production and processing of a warmer, for example, assuming a bag forming process of a heat-generating material, the width of the nonwoven fabric is small when a certain load is applied to the nonwoven fabric.
本発明における複合不織布においては、タテ方向の5N／5cmの荷重時における幅入り率が10%以下、好ましくは5%以下、より好ましくは3.5%以下である。
5%伸張時の中間応力が大きいと、不織布とフイルムとの貼り合わせ加工時あるいは製袋加工時において、伸びに対する抵抗力が大きく、そのため、張力による幅入りが少なく、寸法安定に優れる。5%伸張時の中間応力の目付け換算値が、タテ0.5N／5cm未満、5N／5cmの荷重時における幅入り率が10%を超えると、不織布としての寸法安定性が低下し、加工時に幅入りし易く、カイロの生産加工工程が不安定となり、短繊維の脱落も生じ易くなる。
In the composite nonwoven fabric according to the present invention, the width entering rate at a load of 5 N / 5 cm in the vertical direction is 10% or less, preferably 5% or less, more preferably 3.5% or less.
When the intermediate stress at 5% elongation is large, the resistance to elongation is large at the time of laminating the nonwoven fabric and film or at the time of bag making, and therefore, there is little width due to tension and excellent dimensional stability. If the basis weight conversion value of the intermediate stress at 5% elongation is less than 0.5N / 5cm in length and the width penetration rate at a load of 5N / 5cm exceeds 10%, the dimensional stability as a nonwoven fabric decreases, and the width during processing It is easy to enter, the production process of the body warmer becomes unstable, and the short fibers are likely to fall off.
本発明における複合不織布の層間剥離強度は、長繊維層(A)と、短繊維層(B)との交絡の程度を示すものであり、タテ方向では、1N／5cm以上、好ましくは2N／5cm以上であり、ヨコ方向では、1N／5cm以上、好ましくは1.5N／5cm以上である。層間剥離強度が1N／5cm未満では、短繊維層が剥離し易くなり、脱落し易くなる。 The delamination strength of the composite nonwoven fabric in the present invention indicates the degree of entanglement between the long fiber layer (A) and the short fiber layer (B), and is 1N / 5 cm or more, preferably 2N / 5 cm in the vertical direction. In the horizontal direction, it is 1 N / 5 cm or more, preferably 1.5 N / 5 cm or more. When the delamination strength is less than 1 N / 5 cm, the short fiber layer is easy to peel off and easily fall off.
本発明における複合不織布の厚み変化量は、荷重に対する不織布の厚みの変化を示すものであり、具体的には、表面層の短繊維層の厚みが荷重により、厚み方向に変化することを示し、この値は、肌触り性、柔軟性に大きく係わる指標である。例えば、荷重100ｇ/cm2での厚み変化量が、0.05〜0.50mm、好ましくは、0.08〜0.40mm、より好ましくは0.10〜0.35mmであると肌触り性、柔軟性が良好である。厚み変化量が0.05mm未満では、緻密で硬い肌触りであり、柔軟性が低下すし、一方、0.50mmを超えると、荷重に対する厚みのヘタリ感が強く、粗な構成であり、繊維の脱落や、毛羽立ちがし易くなる。 The thickness change amount of the composite nonwoven fabric in the present invention indicates a change in the thickness of the nonwoven fabric with respect to the load, and specifically indicates that the thickness of the short fiber layer of the surface layer changes in the thickness direction due to the load, This value is an index largely related to touch and flexibility. For example, if the thickness change amount at a load of 100 g / cm 2 is 0.05 to 0.50 mm, preferably 0.08 to 0.40 mm, more preferably 0.10 to 0.35 mm, the touch and flexibility are good. When the thickness change amount is less than 0.05 mm, it is dense and hard to the touch, and the flexibility is lowered.On the other hand, when it exceeds 0.50 mm, the thickness has a strong stickiness with respect to the load, and it has a rough structure. It becomes easy to fluff.
本発明における複合不織布をカイロ用不織布として用い、熱可塑性樹脂フイルムとラミネートした、通気性を有する包材に、空気の存在下で発熱する発熱組成物を収容して封止することにより、本発明の使い捨てカイロが得られる。この場合、ラミネートする面の反対側に短繊維ウェブ層を配置することが好ましい。
この包材の少なくとも一面において、発熱組成物を発熱させるために、空気の通気性が必要である。包材に通気性を与えるには、複合不織布に押し出フイルムをラミネートした後、孔をあける方法、または有孔フイルムと不織布とをラミネートする方法があげられる。熱可塑性樹脂フイルムとしては、例えば、ポリエチレン、メタロセン触媒を用いた直鎖状低密度ポリエチレン、ポリプロピレン、ポリエチレン／エチレンー酢酸ビニール共重合物、ポリエチレン／エチレンアクリル酸塩共重合物、ポリアミドなどの単一または、２種以上の積層フイルムなどが用いられる。
The composite nonwoven fabric according to the present invention is used as a warmer nonwoven fabric, laminated with a thermoplastic resin film, and encapsulated with an exothermic composition that generates heat in the presence of air in a breathable packaging material. Can be obtained. In this case, it is preferable to arrange a short fiber web layer on the opposite side of the surface to be laminated.
At least one surface of the packaging material needs air permeability in order to generate heat from the exothermic composition. In order to give air permeability to the packaging material, a method of laminating an extruded film on a composite nonwoven fabric and then making a hole, or a method of laminating a perforated film and a nonwoven fabric can be mentioned. Examples of the thermoplastic resin film include polyethylene, linear low-density polyethylene using a metallocene catalyst, polypropylene, polyethylene / ethylene-vinyl acetate copolymer, polyethylene / ethylene acrylate copolymer, polyamide, or a single or Two or more kinds of laminated films are used.
複合不織布とフィルムのラミネートは、通常の方法、例えば、樹脂フイルムの一層または多層の押出ラミネート方法、コロナ処理などのフイルムに接着剤を塗布させ、不織布と合わせて加熱および／加圧で接着させる方法、熱圧着で接着させる方法等がある。
発熱組成物としては、空気の存在下で発熱するものであれば特に制限はない。例えば、鉄粉などの金属紛、金属塩化物、金属硫化物、反応助剤、水及び水を吸収する保湿材（例えば、活性炭、木紛、シリカゲル、リンター等）、添加物などの混合物が用いられる。本発明における使い捨てカイロは、例えば複合不織布を袋体形状にし、この袋体に発熱組成物を収容してから外周部を熱融着することで得られる。
For laminating a composite nonwoven fabric and a film, a conventional method, for example, a method of extrusion lamination of a single layer or a multilayer of a resin film, a method of applying an adhesive to a film such as a corona treatment, and bonding the nonwoven fabric with heat and / or pressure There is a method of bonding by thermocompression bonding.
The exothermic composition is not particularly limited as long as it generates heat in the presence of air. For example, metal powder such as iron powder, metal chloride, metal sulfide, reaction aid, water and moisture-absorbing material (for example, activated carbon, wood powder, silica gel, linter, etc.), a mixture of additives, etc. are used. It is done. The disposable body warmer in the present invention can be obtained, for example, by forming a composite nonwoven fabric into a bag shape, housing a heat generating composition in the bag body, and then heat-sealing the outer peripheral portion.
以下、本発明を実施例によりさらに詳細に説明する。なお、例中の特性は、下記の方法で測定した。
(1) 目付：試料20cm×25cmを、３箇所切り取り重量測定し、目付に換算、平均値から求める。
(2) 厚み：直径10mmの加圧子で、荷重10Kpaにて１０カ所測定し、平均値から求める。
厚み変化量(mm）は、ＫＥＳ圧縮特性方式を用いて、荷重10Kpa時の厚みから、荷重0時の厚みへの変化量(mm)で示す。
(3) 平均繊維径(μm)：電子顕微鏡で500倍の拡大写真をとり、１０本の平均値で求める。(4)平均みかけ密度(g/cm3)：目付と、荷重10KPaの厚みから単位容積あたりの重量を３箇所の平均値で求める。
(5)引張強度(N／5cm、5%伸張時の中間応力)：JIS-L-1906に準じ、引張試験機で、幅5cm、長さ30cm試料を切り取り、つかみ間隔10cm、引張速度10cm/minで5%伸張時の中間応力、破断強度を縦,横それぞれ３箇所測定し３点の平均値で求める。
(6)5N荷重時の幅入り率(%)：JIS-L-1906に準じ、引張試験機で、幅5cm、長さ30cm試料を切り取り、つかみ間隔10cm、引張速度10cm/minで、タテ方向に5Nの荷重を掛け、30秒間後、中央部の幅を測定し、幅入り率を測定する。
(7)剥離強度(N／5cm)：JIS−K−6854のＴ字90度剥離法に基づいて測定し平均値で示す。
(8)耐摩擦性(級)：学振摩擦機で荷重250g、回数100回摩耗して目視判定する。
× 1級 毛羽立ちが甚だしい。
△ 2級 毛羽立ちが少しある。
○ 3級 毛羽立ちが殆んどない。
◎ 4級 毛羽立ちが全くない。
(9)肌触り性：手の平に触れた感触で判定する。
○：立毛感があり、ソフトで柔軟な感触である。
△：立毛感が弱く、ソフトな感触が少し劣る。
×：立毛感がなく、ソフト性がなく、薄っぺらい感触である。
(10)透水量(L/m2・sec)：JIS−A−1218法（定水位試験法）に準じる。水位を一定にして、単位面積当たりの透水量を測定する。
(11)柔軟性(mm)：JIS−L−1906法 45度カンチレバー法に準じる。
Hereinafter, the present invention will be described in more detail with reference to examples. The characteristics in the examples were measured by the following methods.
(1) Weight per unit: A sample of 20 cm x 25 cm is cut out at three locations and weighed, converted to a basis weight, and obtained from the average value.
(2) Thickness: A pressurizer with a diameter of 10 mm, measure at 10 points with a load of 10 Kpa, and calculate from the average value.
The thickness change amount (mm) is indicated by the change amount (mm) from the thickness at the load of 10 Kpa to the thickness at the load of 0 using the KES compression characteristic method.
(3) Average fiber diameter (μm): Take an enlarged photograph of 500 times with an electron microscope and obtain an average value of 10 fibers. (4) Average apparent density (g / cm 3 ): The weight per unit volume is determined from the basis weight and the thickness of a load of 10 KPa as an average value at three locations.
(5) Tensile strength (N / 5cm, intermediate stress at 5% elongation): According to JIS-L-1906, 5cm wide and 30cm long specimens are cut out using a tensile tester, gripping distance is 10cm, tensile speed is 10cm / Measure the intermediate stress and breaking strength at 5% elongation at min at 3 points each in length and width and obtain the average value of 3 points.
(6) Width entering rate at 5N load (%): According to JIS-L-1906, a sample of 5cm width and 30cm length was cut out with a tensile tester, with a grip interval of 10cm and a tensile speed of 10cm / min, in the vertical direction A load of 5N is applied to the tube, and after 30 seconds, the width of the central portion is measured, and the width entering rate is measured.
(7) Peel strength (N / 5cm): Measured based on JIS-K-6854 T-shaped 90 degree peel method and shows average value.
(8) Friction resistance (class): Visually judged by wearing a 250g load with a Gakushin friction machine 100 times.
× 1st class
△ Grade 2 Slightly fuzzy.
○ Grade 3 There is almost no fuzz.
◎ Grade 4 No fuzz.
(9) Touch: Judged by the touch of the palm.
○: There is a feeling of napping, and a soft and flexible feel.
(Triangle | delta): A feeling of fluff is weak and soft touch is a little inferior.
X: There is no feeling of hair raising, there is no softness, and it is a thin touch.
(10) Water permeability (L / m 2 · sec): Conforms to JIS-A-1218 method (constant water level test method). Measure the amount of water per unit area with a constant water level.
(11) Flexibility (mm): JIS-L-1906 method Conforms to 45-degree cantilever method.
[実施例１〜４、比較例１，２]
実施例１において、公知のスパンボンド法を用いて、ナイロン長繊維(丸断面、平均繊維径15μm)からなる不織布(目付け20g/m2、部分熱圧着率7%)とし、次いで、ナイロン短繊維(丸断面、平均繊維径17μm、繊維長51mm、目付け40g/m2)をカード機で開繊してからプレニードルパンチ機（針番手４０番、針深さ12mm、突き密度30回／cm2）で交絡させた短繊維ウエブ層をナイロン長繊維に積層し、金網ネット状に載せ、噴射ノズル径0.2mm、噴射孔間隔1.5mm、初期噴射圧10Mpaで短繊維層側を上面として予備流体交絡をおこない、次いで、噴射圧12Mpa、噴射ノズルとネット間隔7cm、速度50m／minで2回目の短繊維層側から流体交絡処理を行い、脱水、乾燥して複合不織布を得た。
[Examples 1 to 4, Comparative Examples 1 and 2]
In Example 1, using a known spunbond method, a non-woven fabric (weight per unit area: 20 g / m 2 , partial thermocompression rate: 7%) made of nylon long fibers (round cross section, average fiber diameter of 15 μm), then nylon short fibers (Circular cross section, average fiber diameter 17μm, fiber length 51mm, basis weight 40g / m 2 ) opened with a card machine, then pre-needle punch machine (needle number 40, needle depth 12mm, impact density 30 times / cm 2 ) The short fiber web layer entangled in) is laminated on nylon long fiber and placed on a wire mesh net, prefluid entangled with the short fiber layer side as the top surface with an injection nozzle diameter of 0.2mm, an injection hole interval of 1.5mm, and an initial injection pressure of 10Mpa Next, fluid entanglement treatment was performed from the second short fiber layer side at an injection pressure of 12 Mpa, an injection nozzle and a net interval of 7 cm, and a speed of 50 m / min, followed by dehydration and drying to obtain a composite nonwoven fabric.
実施例２は、公知のスパンボンド法で、ポリエステル長繊維(丸断面、平均繊維径14μm)からなる不織布を使用(目付け15g/m2、部分熱圧着率11%)、ポリエステル短繊維(丸断面、平均繊維径12μm、繊維長38mm)70重量%、低融点の共重合ポリエステル短繊維(融点130℃、丸断面、平均繊維径18μm、繊維長38mm)30重量%との混合短繊維ウエブ層(目付け30g/m2)を実施例１と同様に形成させて積層し、実施例１と同様に、短繊維側を上面として流体交絡を行い、脱水、乾燥して複合不織布を得た。 Example 2 is a known spunbond method using a non-woven fabric made of polyester long fibers (round cross section, average fiber diameter 14 μm) (weight per unit area 15 g / m 2 , partial thermocompression bonding rate 11%), polyester short fibers (round cross section). , Average fiber diameter 12μm, fiber length 38mm) 70% by weight, low melting copolymer polyester short fiber (melting point 130 ° C, round cross section, average fiber diameter 18μm, fiber length 38mm) 30% by weight mixed short fiber web layer ( A basis weight of 30 g / m 2 ) was formed and laminated in the same manner as in Example 1, and in the same manner as in Example 1, fluid entanglement was performed with the short fiber side as the upper surface, followed by dehydration and drying to obtain a composite nonwoven fabric.
実施例３は、公知のスパンボンド法で、ポリピロピレン長繊維(異形断面の捲縮繊維、平均繊維径19μm)からなる不織布を使用(目付け40g/m2、部分熱圧着率5%)、ポリエステル短繊維(丸断面、平均繊維径12μm、繊維長38mm)70重量%、低融点の共重合ポリエステル短繊維(丸断面、平均繊維径18μm、繊維長38mm)30重量%との混合繊維ウエブ層(目付け35g/m2) を実施例１と同様に形成させて積層し、実施例１と同様に流体交絡を行い、脱水、乾燥して複合不織布を得た。 Example 3 is a known spunbond method using a non-woven fabric composed of polypropylene long fibers (crimped fibers having an irregular cross section, average fiber diameter 19 μm) (weight per unit area 40 g / m 2 , partial thermocompression bonding rate 5%), polyester short 70% by weight of fibers (round section, average fiber diameter 12μm, fiber length 38mm), low-melting copolyester short fiber (round section, average fiber diameter 18μm, fiber length 38mm) 30% by weight 35 g / m 2 ) was formed and laminated in the same manner as in Example 1, fluid entangled in the same manner as in Example 1, dehydrated and dried to obtain a composite nonwoven fabric.
実施例４は、公知のスパンボンド法で、ポリエステル長繊維(丸断面、平均繊維径14μm)からなる不織布を使用(目付け12g/m2、部分熱圧着率20%)、ポリエステル短繊維(丸断面、平均繊維径14μm、繊維長51mm)50重量%、レーヨン短繊維(異形断面、平均繊維径16μm、繊維長51mm)50重量%との混合繊維ウエブ層(目付け40g/m2) を実施例１と同様に形成させて積層し、実施例１と同様に流体交絡を行い、脱水、乾燥して複合不織布を得た。 Example 4 is a known spunbond method using a non-woven fabric made of polyester long fibers (round cross section, average fiber diameter of 14 μm) (weighing 12 g / m 2 , partial thermocompression bonding rate 20%), polyester short fibers (round cross section). Example 1 A mixed fiber web layer (weight per unit area: 40 g / m 2 ) of 50% by weight of an average fiber diameter of 14 μm and a fiber length of 51 mm) and 50% by weight of a rayon short fiber (irregular cross section, average fiber diameter of 16 μm and fiber length of 51 mm) Were formed and laminated in the same manner as described above, fluid entangled in the same manner as in Example 1, dehydrated and dried to obtain a composite nonwoven fabric.
比較例１は、公知のスパンボンド法で、ポリエステル長繊維(丸断面、平均繊維径14μm)からなる不織布(目付け50g/m2、部分熱圧着率25%)を、更に、実施例１と同様に流体交絡を行い、脱水、乾燥して不織布を得た。 Comparative Example 1 is a known spunbonding method in which a non-woven fabric (weighing 50 g / m 2 , partial thermocompression rate 25%) made of polyester long fibers (round cross section, average fiber diameter 14 μm) is further applied as in Example 1. The fluid was entangled and dehydrated and dried to obtain a nonwoven fabric.
比較例２は、実施例４の短繊維層と同様のポリエステル短繊維(丸断面、平均繊維径14μm、繊維長51mm)50重量%、レーヨン短繊維(異形断面、平均繊維径16μm、繊維長51mm)50重量%との混合繊維を、カード機で開繊してからプレニードルパンチ機（針番手４０番、針深さ12mm、突き密度30回／cm2）で交絡させたウエブ層(目付け50g/m2)を、更に、実施例１と同様に流体交絡を行い、脱水、乾燥して不織布を得た。 Comparative Example 2 is the same polyester short fiber as in the short fiber layer of Example 4 (round section, average fiber diameter 14 μm, fiber length 51 mm), 50% by weight, rayon short fiber (irregular section, average fiber diameter 16 μm, fiber length 51 mm). ) Web layer (50g weight per unit) of 50% by weight mixed fiber, which was entangled with a pre-needle punch machine (needle number 40, needle depth 12mm, impact density 30 times / cm 2 ) after opening with a card machine / m 2 ) was further subjected to fluid entanglement as in Example 1, dehydrated and dried to obtain a nonwoven fabric.
一方、比較例１は、長繊維不織布のみからなるものであり、強度、寸法安定性、耐摩耗性に優れているが、厚み変化量が小さく、柔軟性が悪く、肌触り性などが劣る。比較例２の短繊維のみからなる不織布は、柔軟性、肌触り性に優れているが、強度、寸法安定性、耐摩耗性に劣るものであった。
On the other hand, Comparative Example 1 is composed only of a long-fiber nonwoven fabric and is excellent in strength, dimensional stability, and wear resistance, but has a small thickness change amount, poor flexibility, and poor touch. The non-woven fabric consisting only of the short fibers of Comparative Example 2 was excellent in flexibility and touch, but was inferior in strength, dimensional stability and wear resistance.
本発明のカイロ用不織布によれば、熱可塑性合成長繊維不織布と短繊維不織布とを特定割合で積層し、流体交絡で一体化複合させることで、カイロ生産加工時の寸法安定性、耐摩耗性、柔軟性、肌触り性、保温性に優れており、使い捨てカイロ、例えば揉むカイロ、貼るカイロの包材として極めて好適である。さらに、短繊維層を包材の外層に用いた使い捨てカイロでは、フエルト状の外観で、表面に立毛を有する触感で、外観品位の良いものであり、特に有用であるといえる。
According to the non-woven fabric for warmers of the present invention, the thermoplastic synthetic long-fiber non-woven fabric and the short-fiber non-woven fabric are laminated at a specific ratio and integrated and combined by fluid entanglement, so that the dimensional stability and wear resistance at the time of cairo production processing. It is excellent in flexibility, touch and heat retention, and is extremely suitable as a packaging material for disposable warmers, for example, warming warmers and sticking warmers. Furthermore, a disposable body warmer using a short fiber layer as the outer layer of the packaging material is particularly useful because it has a felt-like appearance, a tactile sensation with napped surfaces, and a good appearance quality.
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Cited By (8)
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|---|---|---|---|---|
| JP2009005958A (en) * | 2007-06-28 | 2009-01-15 | Okamoto Ind Inc | Disposable portable body warmer |
| JP2009028114A (en) * | 2007-07-25 | 2009-02-12 | Asahi Kasei Fibers Corp | Throwaway pocket body warmer |
| JP2009225975A (en) * | 2008-03-21 | 2009-10-08 | Toyobo Co Ltd | Nonwoven fabric for heating implement, and heating implement using the same |
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| JP2009005958A (en) * | 2007-06-28 | 2009-01-15 | Okamoto Ind Inc | Disposable portable body warmer |
| JP2009028114A (en) * | 2007-07-25 | 2009-02-12 | Asahi Kasei Fibers Corp | Throwaway pocket body warmer |
| JP2009225975A (en) * | 2008-03-21 | 2009-10-08 | Toyobo Co Ltd | Nonwoven fabric for heating implement, and heating implement using the same |
| JP2013231262A (en) * | 2012-04-27 | 2013-11-14 | Koyama Kenji | Reinforcing base fabric for urethane foam molding |
| US9982375B2 (en) | 2012-11-02 | 2018-05-29 | Toyobo Co., Ltd. | Thermocompression-bonding filament nonwoven fabric having excellent molding properties |
| WO2014069562A1 (en) * | 2012-11-02 | 2014-05-08 | 東洋紡株式会社 | Thermocompression-bonding long-fiber nonwoven fabric having excellent molding properties |
| JP2014091875A (en) * | 2012-11-02 | 2014-05-19 | Toyobo Co Ltd | Thermal compressive bonded long fiber nonwoven fabric with superior formability |
| JP2015200032A (en) * | 2014-04-07 | 2015-11-12 | 東洋紡株式会社 | Back surface material for vehicle seat |
| JP2021500483A (en) * | 2017-10-20 | 2021-01-07 | インヴィスタ テキスタイルズ（ユー．ケー．）リミテッド | High load-bearing nylon staple fibers with additives, blended yarns and their fabrics |
| JP7242664B2 (en) | 2017-10-20 | 2023-03-20 | インヴィスタ テキスタイルズ（ユー．ケー．）リミテッド | High load-bearing nylon staple fibers with additives, blended yarns and fabrics thereof |
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| EP4082494A4 (en) * | 2019-12-25 | 2024-01-17 | Kao Corp | Heating implement |
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