JP5110999B2 - Disposable body warmers - Google Patents
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- JP5110999B2 JP5110999B2 JP2007192859A JP2007192859A JP5110999B2 JP 5110999 B2 JP5110999 B2 JP 5110999B2 JP 2007192859 A JP2007192859 A JP 2007192859A JP 2007192859 A JP2007192859 A JP 2007192859A JP 5110999 B2 JP5110999 B2 JP 5110999B2
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Images
Description
本発明は、使い捨てカイロ、特に、カイロの袋材に積層不織布を用い、該積層不織布の構成繊維の分散が均等で、地合が均一であり、発熱物質等の粉漏れが少なく、表面の摩擦強度、熱シール性に優れた使い捨てカイロに関する。 The present invention uses a disposable non-woven body, in particular, a laminated non-woven fabric for the bag material of the warm-up body, the dispersion of the constituent fibers of the laminated non-woven fabric is uniform, the formation is uniform, there is little powder leakage of exothermic substances, etc., surface friction The present invention relates to a disposable body warmer excellent in strength and heat sealability.
従来から、一般的に使用されている使い捨てカイロの袋材は、合成繊維からなるスパンボンド不織布と熱可塑性フィルムとのラミネート品が使用されている。
特許文献１には、外気温度変化の影響を低減するために、厚さ０．１５〜１．５ｍｍ、繊維体積分率が５〜２５％である熱可塑性合成繊維不織布に、熱可塑性フィルムをラミネートした通気性を有する複層構造物に発熱組成物を収容してなる使い捨てカイロが提案されている。
特許文献２には、カイロの表面と裏面とが互いにその外表面上に手の感触の差が生じるように構成された異なるシート状物を表面と裏面とに用いるカイロが提案されている。
特許文献３には、第一成分がポリエチレンテレフタレート又はその共重合体、第二成分がポリオレフィンまたはその共重合体である複合繊維からなり、特定の通気量、特定の最大孔径のシート状物を袋体とし、該袋体に酸素の存在下で発熱する発熱組成物を封入してなる使い捨てカイロであって、該袋体の構成複合繊維が低融点成分を含有することで、ヒートシール性が改善でき、微粉末が漏出することなく、長時間安定した発熱を保ち、工業的生産に適し、柔軟で肌触りの良好な捨てカイロが提案されている。
Conventionally, as a bag material for disposable warmers, a laminate product of a spunbond nonwoven fabric made of synthetic fiber and a thermoplastic film has been used.
In Patent Document 1, a thermoplastic film is laminated on a thermoplastic synthetic fiber nonwoven fabric having a thickness of 0.15 to 1.5 mm and a fiber volume fraction of 5 to 25% in order to reduce the influence of outside air temperature change. A disposable body warmer has been proposed in which a heat generating composition is contained in a multilayer structure having air permeability.
Patent Document 2 proposes a warmer that uses different sheet-like materials for the front and back surfaces that are configured such that the front and back surfaces of the warmer have a difference in hand feeling on the outer surface.
Patent Document 3 discloses a sheet-like material having a specific air flow rate and a specific maximum pore diameter, which is composed of a composite fiber in which the first component is polyethylene terephthalate or a copolymer thereof, and the second component is a polyolefin or a copolymer thereof. A disposable body warmer that contains a heat-generating composition that generates heat in the presence of oxygen in the bag body, and the heat-sealability is improved because the composite fiber of the bag body contains a low-melting-point component There has been proposed a disposable body warmer that maintains a stable heat generation for a long time without leaking fine powder, is suitable for industrial production, is flexible and has a good touch.
特許文献４には、シート材料をヒートシールにより袋体とし、該袋体に発熱組成物を封入してなる使い捨てカイロ用シート材料であって、該シート材料がメルトブロー方式により得られた不織布に通気性を有する補強用シート状物を部分的に接合させた複合シートであり、該シートを用いることにより、通気性を低減して発熱継続時間を安定し、発熱組成物が漏れることのない使い捨てカイロが提案されている。
上記従来の技術の提案内容においては、外気温度の影響を低減でき、手で触る感触、低融点成分による熱シール性、極細繊維不織布の通気性などの改善がなされたが、使い捨てカイロの袋材として、表面の摩擦強度、粉漏れ性、繊維の分散性（地合の均一性）、熱シール性など課題については、充分に改良されているとはいえない。
Patent Document 4 discloses a disposable warmer sheet material in which a sheet material is formed into a bag body by heat sealing, and the heat generating composition is enclosed in the bag body, and the sheet material is passed through a nonwoven fabric obtained by a melt blow method. Disposable body warmer which is a composite sheet in which a reinforcing sheet material having a heat-resistance property is partially joined, and by using the sheet, the breathability is reduced, the heat generation duration is stabilized, and the heat generation composition does not leak. Has been proposed.
In the above-mentioned proposal of the conventional technology, the influence of the outside air temperature can be reduced, the touch feeling by hand, the heat sealability by the low melting point component, the breathability of the ultrafine fiber nonwoven fabric, etc. have been improved. However, it cannot be said that the problems such as surface frictional strength, powder leakage, dispersibility of fibers (uniformity of formation), and heat sealability are sufficiently improved.
本発明は、使い捨てカイロにおいて、上記従来の問題を解決し、発熱組成物の細かい粒子状物の粉漏れがし難く、かつ、表面の耐磨耗性、製袋時のヒートシール性、繊維分散性が良く地合の均一性に優れた使い捨てカイロを提供することである。 The present invention solves the above-mentioned conventional problems in disposable body warmers, makes it difficult for fine particulate matter of the exothermic composition to leak, and wear resistance of the surface, heat sealability during bag making, fiber dispersion It is to provide a disposable body warmer that has good properties and excellent uniformity of formation.
本発明者らは、前記課題を解決するため鋭意検討した結果、熱可塑性繊維層と、メルトブロー法で得られた極細繊維層と、特定の低融点熱可塑性繊維を含む層との、３層構造積層不織布と熱可塑性フィルムとのラミネートからなる複合シートを使い捨てカイロ用の袋材として用いることで、表面磨耗性、粉漏れ性、ヒートシール性、均一分散性を有効に発揮できることを見出し、本発明に到達した。
即ち、本発明は、以下の通りのものである。
（１）酸素の存在下で発熱する発熱組成物を袋材に収容した使い捨てカイロであって、袋材が、第１層の熱可塑性合成繊維層、第２層のメルトブロー法で得られた極細繊維層、第３層として第１層の構成繊維の融点より３０℃以上低融点である熱可塑性合成繊維を含む層、を積層して１０〜３０％の部分熱圧着率で熱圧着して一体化した積層不織布と、熱可塑性フィルムとを積層不織布の第３層面に貼り合わせた複合シートからなり、その袋材の表裏の少なくとも一方に通気孔を設けた複合シートとし、該積層不織布の第１層及び第３層を構成する繊維の平均繊維径が１０〜３０μｍ、第２層の平均繊維径が０．５〜７μｍであり、該積層不織布の構成繊維が、ポリエステル樹脂及び／又はポリエステル系共重合体からなり、または、ポリアミド樹脂及び／又はポリアミド系共重合体からなり、目付けが１０〜７０ｇ／ｍ2 、摩擦強度が３級以上、粉漏れ率が１０％以下、地合指数が２００以下であり、該袋材のシール強度が１０Ｎ／２５ｍｍ以上であることを特徴とする使い捨てカイロ。
As a result of intensive studies to solve the above problems, the present inventors have found that a three-layer structure of a thermoplastic fiber layer, an ultrafine fiber layer obtained by a melt blow method, and a layer containing a specific low melting point thermoplastic fiber. It has been found that by using a composite sheet made of a laminate of a laminated nonwoven fabric and a thermoplastic film as a bag material for a disposable body warmer, surface wear, powder leakage, heat sealability, and uniform dispersibility can be effectively exhibited. Reached.
That is, the present invention is as follows.
(1) A disposable body warmer in which a heat generating composition that generates heat in the presence of oxygen is contained in a bag, wherein the bag is made of a thermoplastic synthetic fiber layer as a first layer and a melt blow method as a second layer. A fiber layer and a layer containing a thermoplastic synthetic fiber having a melting point of 30 ° C. or more lower than the melting point of the constituent fibers of the first layer as a third layer are laminated and thermocompression bonded at a partial thermocompression ratio of 10 to 30%. The laminated nonwoven fabric and the thermoplastic film are bonded to the third layer surface of the laminated nonwoven fabric, and a composite sheet is provided in which at least one of the front and back sides of the bag material is provided with a vent hole . The average fiber diameter of the fibers constituting the layers and the third layer is 10 to 30 μm, the average fiber diameter of the second layer is 0.5 to 7 μm, and the constituent fibers of the laminated nonwoven fabric are polyester resin and / or polyester-based Made of polymer or polyamid A resin and / or a polyamide-based copolymer, having a basis weight of 10 to 70 g / m 2 , a friction strength of 3 or more, a powder leakage rate of 10% or less, and a formation index of 200 or less . A disposable body warmer having a seal strength of 10 N / 25 mm or more .
（２）前記積層不織布の第３層を構成する繊維の融点が、第１層を構成する繊維の融点よりも３０〜１７０℃の範囲で低いことを特徴とする上記（１）に記載の使い捨てカイロ。
（３）前記積層不織布の第３層を構成する熱可塑性繊維が鞘芯型複合繊維であり、芯部が高融点成分で、鞘部の成分が芯部より３０℃以上低融点であることを特徴とする上記（１）または（２）のいずれか一項に記載の使い捨てカイロ。
( 2 ) Disposable as described in ( 1 ) above, wherein the melting point of the fibers constituting the third layer of the laminated nonwoven fabric is lower in the range of 30 to 170 ° C. than the melting point of the fibers constituting the first layer. Cairo.
( 3 ) The thermoplastic fiber constituting the third layer of the laminated nonwoven fabric is a sheath-core type composite fiber, the core part is a high melting point component, and the sheath part component is 30 ° C. or more lower melting point than the core part. Disposable body warmer as described in any one of said (1) or (2) characterized by the above-mentioned.
（４）前記積層不織布の第２層のメルトブローによる極細繊維の目付けが１〜２０ｇ／ｍ2 であることを特徴とする上記（１）〜（３）のいずれか一項に記載の使い捨てカイロ。
（５）前記積層不織布の通気性が１００ｃｃ／ｃｍ2 ／ｓｅｃ以下であることを特徴とする上記（１）〜（４）のいずれか一項に記載の使い捨てカイロ。
( 4 ) The disposable body warmer according to any one of (1) to ( 3 ) above, wherein the basis weight of the ultrafine fibers by melt blow of the second layer of the laminated nonwoven fabric is 1 to 20 g / m 2 .
( 5 ) The disposable body warmer as described in any one of (1) to ( 4 ) above, wherein the breathability of the laminated nonwoven fabric is 100 cc / cm 2 / sec or less.
本発明による使い捨てカイロは、第１層の熱可塑性繊維と、第２層のメルトブロー法で得られた極細繊維と、第３層の低融点熱可塑性繊維とを、積層一体化することで、第１層及び第３層の繊維径の太い繊維の繊維層間に、第２層の極細繊維層が介在し、該繊維間隙を適度に埋める作用を有するため、繊維間隙が極めて小さくて、分散が均一な積層不織布を得ることができ、その結果、細かい粒子の漏れを防ぐことができる。
更に、第３層に低融点繊維を配置することで、メルトブロー法で得られた極細繊維は結晶性が低く融点が低いことによる熱接着効果と、該低融点繊維による熱接着効果が同時に作用することが可能となり、これらの相乗的な熱接着効果により、不織布の部分熱圧着が良好に行われ、その結果、表面耐摩擦性の向上、耐毛羽性の向上、各層間での接着性の向上が図られ、より強固な積層不織布を得ることができる。
更に、使い捨てカイロの袋体を形成する製袋工程においては、積層不織布の第３層の面と、熱可塑性フィルムとが複合化されているため、軟化または溶融温度の異なる樹脂から構成されることとなり、製袋時の熱シールにおいては、該熱シールの温度範囲を広く採るとができ、製袋工程が安定化し、袋体のシール強度が高くすることができ、密封性に優れた使い捨てカイロを得ることができる。
The disposable body warmer according to the present invention is obtained by laminating and integrating a first layer of thermoplastic fibers, a second layer of ultrafine fibers obtained by a melt-blowing method, and a third layer of low melting point thermoplastic fibers. The ultrafine fiber layer of the second layer is interposed between the fiber layers of the fibers having a large fiber diameter of the first layer and the third layer, and has an action of appropriately filling the fiber gap, so that the fiber gap is extremely small and the dispersion is uniform. A laminated nonwoven fabric can be obtained, and as a result, leakage of fine particles can be prevented.
Furthermore, by arranging the low-melting fiber in the third layer, the ultrafine fiber obtained by the melt-blowing method has both a thermal bonding effect due to low crystallinity and a low melting point, and a thermal bonding effect due to the low-melting fiber simultaneously. These synergistic thermal bonding effects make it possible to perform partial thermocompression bonding of the nonwoven fabric, resulting in improved surface friction resistance, improved fuzz resistance, and improved adhesion between layers. And a stronger laminated nonwoven fabric can be obtained.
Furthermore, in the bag making process for forming the bag body of the disposable body warmer, since the surface of the third layer of the laminated nonwoven fabric and the thermoplastic film are combined, they are composed of resins having different softening or melting temperatures. In the heat sealing at the time of bag making, the temperature range of the heat sealing can be taken widely, the bag making process can be stabilized, the sealing strength of the bag body can be increased, and the disposable warmer excellent in sealing performance. Can be obtained.
本発明の使い捨てカイロに用いる積層不織布は、第１層が高融点の熱可塑性繊維（Ｓ）、第２層がメルトブロー法で得られた極細繊維（Ｍ）、第３層が第１層繊維の融点より３０℃以上低融点の熱可塑性繊維（Ｗ）を積層し、熱圧着で一体化したＳ／Ｍ／Ｗの構造を有する積層不織布である。
特に、第２層のメルトブロー法で得られた極細繊維（Ｍ）を介在させる積層構造にすることで、第一に、繊維間隙を小さくでき、第二に、部分熱圧着により層間の接合が強固にでき、第三に、第１層と第３層の融点差を設け、且つ、メルトブロー法により維結晶性の低い繊維となることに基づき軟化点の低い極細繊維層を介在させることで、熱シール強度及び温度範囲が広くできるなどの特徴点が得られる。
In the laminated nonwoven fabric used for the disposable warmer of the present invention, the first layer is a thermoplastic fiber (S) having a high melting point, the second layer is an ultrafine fiber (M) obtained by a melt blow method, and the third layer is a first layer fiber. A laminated nonwoven fabric having an S / M / W structure in which thermoplastic fibers (W) having a melting point of 30 ° C. or more lower than the melting point are laminated and integrated by thermocompression bonding.
In particular, by using a laminated structure in which the ultrafine fibers (M) obtained by the melt blow method of the second layer are interposed, firstly, the fiber gap can be reduced, and secondly, the interlayer bonding is strong by partial thermocompression bonding. Third, by providing a difference in melting point between the first layer and the third layer and interposing an ultrafine fiber layer having a low softening point based on the fact that the fiber becomes low in fiber crystallinity by the melt-blowing method, Features such as increased seal strength and temperature range can be obtained.
第一の特徴である小さい繊維間隙は、熱可塑性繊維の比較的大きい繊維間隙層に、極細繊維が被覆及び／又は混合繊維化されて積層することにより形成されるものである。更に、積層を多層化するとより、さらに繊維間隙が小さくなり、粉漏れし難い構造となる。
第二の特徴の部分熱圧着性は、軟化温度が低い極細繊維を介在させることで、接合温度範囲が広くできるため、接合が強固になり、剛性、層間の剥離強度が高くなる。
第三の特徴の熱シール性の向上効果は、第１層と第３層の融点差を設け、更に、第３層面に熱可塑性フィルムラミネートすることにより軟化及び融点の異なる成分が複合され、熱シール温度範囲を広くすることができることであり、それによりシール強度が強固にでき、シールバーに融解した樹脂の付着がないことで、安定した生産が可能となる。
The first small fiber gap, which is the first feature, is formed by laminating superfine fibers coated and / or mixed into a relatively large fiber gap layer of thermoplastic fibers. Furthermore, when the lamination is made multilayered, the fiber gap is further reduced, and the structure is less likely to cause powder leakage.
The second feature of partial thermocompression bonding is that the bonding temperature range can be widened by interposing ultrafine fibers having a low softening temperature, so that the bonding becomes strong, and the rigidity and delamination strength between layers increase.
The effect of improving the heat sealing property of the third feature is to provide a difference in melting point between the first layer and the third layer, and further, by laminating a thermoplastic film on the surface of the third layer, components having different softening and melting points are combined. That is, the sealing temperature range can be widened, whereby the sealing strength can be strengthened, and the molten resin does not adhere to the sealing bar, thereby enabling stable production.
本発明に用いる第１層の高融点の熱可塑性合成繊維層は、通常、繊維径が１０〜３０μｍ、好ましくは１２〜２０μｍの比較的太い繊維から成り、強度、通気性に優れ、磨耗強度が大きいものであることが好ましい。このような第１層の構成繊維としては、例えば、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、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、共重合ポリアミド繊維などのポリアミド系繊維、高融点成分を芯とし低融点成分を鞘する複合繊維などの熱可塑性合成繊維が挙げられる。
本発明に用いる第３層の熱可塑性合成繊維層は、第１層の繊維より３０℃以上、好ましくは５０℃以上低融点の繊維からなる。
The high-melting thermoplastic synthetic fiber layer of the first layer used in the present invention is usually composed of relatively thick fibers having a fiber diameter of 10 to 30 μm, preferably 12 to 20 μm, and has excellent strength and breathability and wear strength. It is preferable that it is large. Examples of the constituent fibers of the first layer include polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, and copolyester, nylon fibers such as nylon 6, nylon 66, and copolyamide fibers, and high melting point components. Examples thereof include thermoplastic synthetic fibers such as a composite fiber having a core and a low melting point component.
The thermoplastic synthetic fiber layer of the third layer used in the present invention is composed of fibers having a melting point lower than that of the first layer by 30 ° C. or more, preferably 50 ° C. or more.
繊維径は１０〜３０μｍ、好ましくは１２〜２０μｍの範囲の比較的太い繊維が好ましい。構成繊維としては、例えば、低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン、共重合ポリエチレン、共重合ポリプロピレンなどのオレフィン系繊維、ポリエチレンテレフタレートにフタル酸、イソフタル酸、セバシン酸、アジピン酸、ジエチレングリコール、１，４−ブタンジオールの１種又は２種以上を共重合したポリエステル共重合体、脂肪族ポリエステルなどのポリエステル系繊維、共重合ポリアミド繊維などの熱可塑性合成繊維が用いられる。さらに、芯鞘構造、サイドバイサイドなどの２成分からなる複合繊維、例えば、芯が高融点で鞘が低融点の複合繊維で、具体的には、芯が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、共重合ポリエステル、ナイロン６、ナイロン６６、共重合ポリアミドなどの高融点樹脂からなり、鞘が低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン、共重合ポリエチレン、共重合ポリプロピレン、共重合ポリエステル、脂肪族ポリエステルなどの低融点樹脂からなる複合繊維が好ましい。 A relatively thick fiber having a fiber diameter in the range of 10 to 30 μm, preferably 12 to 20 μm is preferable. Examples of the constituent fibers include olefin fibers such as low density polyethylene, high density polyethylene, polypropylene, copolymer polyethylene and copolymer polypropylene, polyethylene terephthalate, phthalic acid, isophthalic acid, sebacic acid, adipic acid, diethylene glycol, 1, 4 A thermoplastic synthetic fiber such as a polyester copolymer obtained by copolymerizing one or more of butanediol, a polyester fiber such as aliphatic polyester, and a copolymerized polyamide fiber is used. Furthermore, a composite fiber composed of two components such as a core-sheath structure and side-by-side, for example, a composite fiber having a high melting point in the core and a low melting point in the sheath, specifically, the core is polyethylene terephthalate, polybutylene terephthalate, copolymer polyester, Made of high melting point resin such as nylon 6, nylon 66, copolymer polyamide, and sheath from low melting point resin such as low density polyethylene, high density polyethylene, polypropylene, copolymer polyethylene, copolymer polypropylene, copolymer polyester, aliphatic polyester A composite fiber is preferred.
本発明の積層不織布は、第１層と第３層の繊維に融点差を設けるものであるが、第３層を構成する繊維の融点差は、好ましくは３０℃以上、さらに好ましくは５０〜１７０℃の範囲で第１層より低融点であることが好ましい。その結果、部分熱圧着時のロール温度範囲を広く設定することができる。熱圧着ロール温度の上下差が１５０℃を超える場合は、高融点側のロール温度の影響を受けて低融点繊維の劣化が生じ易くなる。一方、第１層と第３層との融点差が３０℃未満の場合は、熱圧着温度範囲が狭くなり、ロール温度の条件により強度、摩擦毛羽強度が影響を受け易くなる。 The laminated nonwoven fabric of the present invention provides a difference in melting point between the fibers of the first layer and the third layer. The difference in melting point of the fibers constituting the third layer is preferably 30 ° C. or more, more preferably 50 to 170. The melting point is preferably lower than that of the first layer in the range of ° C. As a result, the roll temperature range during partial thermocompression bonding can be set wide. In the case where the upper and lower difference of the thermocompression-bonding roll temperature exceeds 150 ° C., the low-melting fiber is easily deteriorated due to the influence of the roll temperature on the high melting point side. On the other hand, when the difference in melting point between the first layer and the third layer is less than 30 ° C., the thermocompression bonding temperature range becomes narrow, and the strength and the friction fluff strength are easily affected by the roll temperature conditions.
本発明の積層不織布、第２層のメルトブロー法で得られた極細繊維の繊維径は、好ましくは０．５〜７μｍ以下、より好ましくは１〜５μｍの範囲であり、繊維間隙、及び最大開口径を小さくし、粉漏れ性を少なくする役目を有する。特に太い繊維間隙に、極細繊維が被覆するように積層されることにより、少ない極細繊維比率で繊維間隙を小さくできる。繊維径が７μｍを超えると繊維間隙の被覆効果が低下する。
極細繊維層の目付けは、好ましくは１ｇ／ｍ2 以上、より好ましくは１．５〜２０ｇ／ｍ2 、さらに好ましくは２〜１５ｇ／ｍ2 の範囲である。極細繊維の目付けが１ｇ／ｍ2 未満では、極細繊維層の分散性が不充分となる。
積層不織布全体に対する第２層の極細繊維の含有比率は、通常、５〜５０重量％、好ましくは７〜３０重量％の範囲である。極細繊維としては、例えば、ポリエチレン、ポリプロピレンなどのポリオレフィン系繊維、ナイロン６、ナイロン６６などのポリアミド系繊維、ポリエチレンテレフタレート、ポリブチレンテレフタレート、共重合ポリエステル、脂肪族ポリエステルなどのポリエステル系繊維が挙げられる。
The fiber diameter of the ultrafine fiber obtained by the laminated nonwoven fabric of the present invention and the melt blow method of the second layer is preferably 0.5 to 7 μm or less, more preferably 1 to 5 μm, the fiber gap, and the maximum opening diameter Has a role of reducing the powder leakage and powder leakage. In particular, by laminating the fine fiber gaps so that the fine fibers are covered, the fiber gaps can be reduced with a small fine fiber ratio. When the fiber diameter exceeds 7 μm, the effect of covering the fiber gap decreases.
Mass per unit area of the microfiber layer is preferably 1 g / m 2 or more, more preferably 1.5 to 20 / m 2, more preferably from 2 to 15 g / m 2. When the basis weight of the ultrafine fiber is less than 1 g / m 2 , the dispersibility of the ultrafine fiber layer becomes insufficient.
The content ratio of the ultrafine fibers of the second layer with respect to the entire laminated nonwoven fabric is usually in the range of 5 to 50% by weight, preferably 7 to 30% by weight. Examples of the ultrafine fibers include polyolefin fibers such as polyethylene and polypropylene, polyamide fibers such as nylon 6 and nylon 66, and polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, copolymerized polyester, and aliphatic polyester.
本発明の積層不織布を熱圧着で一体化するとは、例えば、公知のエンボスロールと平滑ロール間で加熱し、圧着して接合することである。加熱温度は、繊維の軟化温度以上の温度から融点以下の温度範囲である。しかし、低融点繊維の熱劣化を考慮した場合、上下ロールの温度差を１５０℃以下、好ましくは１３０℃以下にするのが好ましい。熱圧着の圧力は１０〜１０００ｋＰａ／ｃｍ、好ましくは５０〜７００ｋＰａ／ｃｍである。
本発明の熱圧着面積率は、１０〜３０％が好ましく、より好ましくは１２〜２５％である。
熱圧着に用いるエンボスロールのエンボス模様は、丸状、楕円状、菱形状、円柱状、四角状などの、平行均等配置、千鳥状配置などの均等配置にすることが好ましい。熱圧着部一個の面積は、０．３〜１．５ｍｍ2 、好ましくは０．４〜１．２ｍｍ2 であり、熱圧着の間隔は、０．３〜３ｍｍ、好ましくは０．５〜２．５ｍｍで均等配置させる。
圧着面積率が１０％未満では、接合面積が少なくなり、磨耗強度が低下する。一方、３０％超えると、磨耗強度が高くなるが、風合いがペーパーライクとなる。
The integration of the laminated nonwoven fabric of the present invention by thermocompression bonding means, for example, heating between a known embossing roll and a smooth roll, pressure bonding, and joining. The heating temperature is a temperature range from the temperature above the softening temperature of the fiber to below the melting point. However, when considering the thermal degradation of the low melting point fiber, the temperature difference between the upper and lower rolls is preferably 150 ° C. or less, preferably 130 ° C. or less. The pressure of thermocompression bonding is 10 to 1000 kPa / cm, preferably 50 to 700 kPa / cm.
10-30% is preferable and, as for the thermocompression bonding area ratio of this invention, More preferably, it is 12-25%.
The embossing pattern of the embossing roll used for thermocompression bonding is preferably a uniform arrangement such as a parallel uniform arrangement or a staggered arrangement such as a round shape, an elliptical shape, a rhombus shape, a cylindrical shape, or a square shape. Thermocompression bonded portions one of area, 0.3 to 1.5 mm 2, preferably 0.4 to 1.2 mm 2, the interval of the thermocompression bonding, 0.3 to 3 mm, preferably 0.5 to 2. Distribute evenly at 5 mm.
When the crimping area ratio is less than 10%, the bonding area decreases and the wear strength decreases. On the other hand, if it exceeds 30%, the wear strength increases, but the texture becomes paper-like.
本発明の積層不織布と貼り合わせる熱可塑性フィルムは、袋体に収容した酸素の存在下で発熱する発熱組成物に到達する空気の量を制御するものであり、袋体の少なくとも片面に通気孔を設けることにより通気量を制御する。
本発明で用いる熱可塑性フィルムとしては、低密度ポリエチレン、直鎖状低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、エチレン−酢酸ビニル共重合体、エチレン−α−オレフイン共重合体、その他のエチレン系共重合体樹脂、ポリプロピレン系樹脂、ポリブテン系樹脂、オレフィン系樹脂、ポリプロピレン系共重合体、ポリブテン系共重合体、ポリオレフィン系共重合体、エチレン−アクリル酸共重合体、エチレン−アクリル酸メチル共重合体などの１種、２種以上を組み合わせた積層フィルムを用いることができる。
特に、本発明で使用し、熱シール強度が向上できる好ましい熱可塑性フィルムの組み合わせとして、例えば、融点差が５〜５０℃のある、融点の異なる熱可塑性フィルムの積層フィルムや、極性の有するモノマーを共重合した極性を有する共重合体から形成される熱可塑性極性フィルムなどが好ましい。
The thermoplastic film to be bonded to the laminated nonwoven fabric of the present invention controls the amount of air reaching the heat generating composition that generates heat in the presence of oxygen contained in the bag, and has a vent on at least one side of the bag. By providing, the air flow rate is controlled.
Examples of the thermoplastic film used in the present invention include low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, and other ethylene-based films. Copolymer resin, polypropylene resin, polybutene resin, olefin resin, polypropylene copolymer, polybutene copolymer, polyolefin copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer A laminated film in which one type or two or more types such as a combination is combined can be used.
In particular, as a preferable thermoplastic film combination that can be used in the present invention and can improve the heat seal strength, for example, a laminated film of thermoplastic films having different melting points and a melting point difference of 5 to 50 ° C., or a monomer having polarity. A thermoplastic polar film formed from a copolymer having a copolymerized polarity is preferred.
本発明において、高融点と低融点の２層からなる熱可塑性積層フィルムを用いる場合、積層不織布の第３層側、即ち（Ｃ）層側に高融点成分を配置することが好ましい態様である。この様な構成を有する使い捨てカイロの包材では、最終袋体の構成は、最内層から、低融点フィルム／高融点フィルム／低融点熱可塑性合成繊維不織布／メルトブロー法で得られた極細不織布／高融点熱可塑性合成繊維不織布となり、合計５層からなる構成であり、本発明の特に好ましい態様であるといえる。図１にその使用態様の断面を示す。
更に、オレフィン系樹脂に炭酸カルシュウム、硫酸カルシュウム、硫酸バリュウムなどの無機充填剤を添加して、延伸加工などによる微多孔質フィルムなどが用いられる。
本発明の熱可塑性フィルムの厚みは、１０〜６０μｍの範囲が好ましく、より好ましくは２０〜５０μｍの範囲である。
In the present invention, when a thermoplastic laminated film composed of two layers having a high melting point and a low melting point is used, it is a preferred embodiment that the high melting point component is disposed on the third layer side of the laminated nonwoven fabric, that is, on the (C) layer side. In the packaging body of the disposable body warmer having such a structure, the structure of the final bag body is as follows: from the innermost layer, a low melting point film / a high melting point film / a low melting point thermoplastic synthetic fiber nonwoven fabric / an ultrafine nonwoven fabric obtained by a melt blow method / high It becomes a melting point thermoplastic synthetic fiber nonwoven fabric and has a total of 5 layers, which can be said to be a particularly preferred embodiment of the present invention. FIG. 1 shows a cross section of the usage mode.
Further, a microporous film or the like obtained by adding an inorganic filler such as calcium carbonate, calcium sulfate, or barium sulfate to the olefin resin and drawing it or the like is used.
The thickness of the thermoplastic film of the present invention is preferably in the range of 10 to 60 μm, more preferably in the range of 20 to 50 μm.
本発明の積層不織布と熱可塑性フィルムとの貼り合わせは、樹脂押し出しラミネート法、タンデム押し出しラミネート法、ウレタン系樹脂、エステル系樹脂などを用いたドライラミネート法、ホットメルトパウダー樹脂を用いたラミネート法、ホットメルト系樹脂を用いたカーテンスプレー法などにより行われる。更に、加熱ロールなどの接触による熱ラミネート法などが行われる。特にヒートシール強度（接着力）が１０Ｎ／２５ｍｍ以上が好ましく、より好ましくは、１５〜１００Ｎ／２５ｍｍの範囲である。
積層不織布と熱可塑性フィルムとの複合シートを用いての袋体への製袋加工は、前記積層不織布の第３層内側と接合した熱可塑性フィルム層を内側にして、重ね合わせて、端部のヒートシールとして、公知のシール法によりシールすることによって行われる。例えば、３包シール機、４包シール機などの熱シール法、超音波シール機などで行うことができる。さらに、２個以上の多数個連続の連包袋状に製袋加工することもできる。
The lamination of the laminated nonwoven fabric of the present invention and the thermoplastic film is a resin extrusion laminating method, a tandem extrusion laminating method, a urethane-based resin, a dry laminating method using an ester resin, a laminating method using a hot melt powder resin, It is performed by a curtain spray method using a hot melt resin. Further, a heat laminating method by contact with a heating roll or the like is performed. In particular, the heat seal strength (adhesive strength) is preferably 10 N / 25 mm or more, and more preferably 15 to 100 N / 25 mm.
The bag making process to the bag body using the composite sheet of the laminated nonwoven fabric and the thermoplastic film is performed by superposing the thermoplastic film layer joined to the inside of the third layer of the laminated nonwoven fabric on the inside, As heat sealing, sealing is performed by a known sealing method. For example, it can be carried out by a heat sealing method such as a three-pack sealing machine or a four-pack sealing machine, or an ultrasonic sealing machine. Furthermore, it is possible to form a bag into two or more continuous continuous bags.
本発明の使い捨てカイロの袋体は、例えば、袋内に充填した発熱組成物が落下や、重量物が載った時に破袋しないため、高い袋体シール強度が必要である。従って、袋体のシール強度は、１０Ｎ／２５ｍｍ以上、好ましくは１５Ｎ／２５ｍｍ以上、より好ましくは２０〜１００Ｎ／２５ｍｍの範囲ある。シール強度が１０Ｎ／２５ｍｍ未満では、シール部分が剥離し易くなり、内容物が外部に漏れるなどの問題が生じる。
さらに製袋加工を安定に行うためには、熱シール温度範囲が広いことが必要である。例えば、温度範囲が８０〜２００℃が好ましく、さらに好ましくは９０〜１９０℃、最も好ましくは１２０〜１８０℃の範囲である。これは、シール機のシール部の温度が開始時から少しずつ上昇し、さらに環境温度により変化するなど、一定温度にコントロールすることが難しいからである。温度範囲が８０℃未満の狭い範囲の設定が必要な場合は、環境温度、ヒーター部の蓄熱などの影響でシール強度が変化するなどの問題が生じる。一方、２００℃を超える温度範囲では、低融点繊維の熱劣化などで物性低下などを生じる。
The bag body of the disposable body warmer of the present invention requires high bag body seal strength because, for example, the exothermic composition filled in the bag does not drop or break when a heavy object is placed on the bag. Accordingly, the sealing strength of the bag body is 10 N / 25 mm or more, preferably 15 N / 25 mm or more, more preferably 20 to 100 N / 25 mm. When the seal strength is less than 10 N / 25 mm, the seal portion is easily peeled off, causing problems such as leakage of contents to the outside.
Furthermore, in order to carry out the bag making process stably, it is necessary that the heat seal temperature range is wide. For example, the temperature range is preferably 80 to 200 ° C, more preferably 90 to 190 ° C, and most preferably 120 to 180 ° C. This is because it is difficult to control the temperature of the sealing portion of the sealing machine to a constant temperature, for example, the temperature gradually increases from the start and further changes depending on the environmental temperature. When the temperature range needs to be set in a narrow range of less than 80 ° C., there arises a problem that the seal strength changes due to the influence of the environmental temperature, the heat storage of the heater portion, and the like. On the other hand, in the temperature range exceeding 200 ° C., physical properties are reduced due to thermal deterioration of the low melting point fiber.
更に、熱シール直後の温度で接着力があること、つまり、ホットタック性に優れることが、製袋直後のシール部分に充填物の噛み込み、シール部分の破れなどの発生することなく製袋加工が可能となるので好ましい。該ホットタック性は、袋体の製袋直後、即ちヒートシール直後に、酸素の存在下で発熱する発熱組成物を袋体に封入するので、封入時にヒートシール部が破壊しないことが生産性の観点から重要となる。ホットタック強力は、１Ｎ／２５ｍｍ以上、好ましくは２〜２０Ｎ／２５ｍｍの範囲である。
更に、ホットタック強度がヒートシール温度の広い範囲において、適切に得られることが好ましい。表３に示した通り、本発明においては、ホットタック強度に対するヒートシール温度の適用幅が広くなるという効果を有する。
本発明においては、積層不織布と熱可塑性フィルムとの複合シートの熱シール温度範囲を広くとることができ、且つ高く安定したシール強度を得ることができる。これは、第１層と第３層の繊維の層間で融点差を３０℃以上設けて、低融点層の繊維が軟化または融解しても、高融点繊維が所定の繊維形状を維持していることや、熱可塑性フィルムの軟化または融解する温度に差があり、軟化又は融解する領域の温度が広くできることに起因するものである。従って、製袋加工時にシールバーに繊維の融解物が付着すること回避することができる。
In addition, the fact that there is adhesive strength at the temperature immediately after heat sealing, that is, excellent hot tackiness, makes it possible to form a bag without causing the filling part to bite into the seal part immediately after bag making and tearing of the seal part. Is preferable. The hot tack property is such that the heat-generating composition that generates heat in the presence of oxygen is enclosed in the bag immediately after the bag is formed, that is, immediately after heat sealing. It is important from a viewpoint. The hot tack strength is 1 N / 25 mm or more, preferably in the range of 2 to 20 N / 25 mm.
Furthermore, it is preferable that the hot tack strength is appropriately obtained in a wide range of the heat seal temperature. As shown in Table 3, the present invention has an effect that the application range of the heat seal temperature to the hot tack strength is widened.
In the present invention, the heat sealing temperature range of the composite sheet of the laminated nonwoven fabric and the thermoplastic film can be widened, and a high and stable sealing strength can be obtained. This is because the melting point difference is set to 30 ° C. or more between the fibers of the first layer and the third layer, and the high melting point fiber maintains the predetermined fiber shape even if the fiber of the low melting point layer is softened or melted. This is because there is a difference in the temperature at which the thermoplastic film softens or melts, and the temperature of the softened or melted region can be widened. Therefore, it is possible to avoid the fiber melt from adhering to the seal bar during bag making.
本発明において、積層不織布と熱可塑性フィルムの複合シート及びその袋体は、微細粒の粉漏れが少なくでき、熱シール温度範囲が広くでき、且つ熱シール強度が高く、地合の均等性に優れている。該積層不織布の目付は、１０〜７０ｇ／ｍ2 、好ましくは１５〜５０ｇ／ｍ2 である。目付けが１０ｇ／ｍ2 未満では、粉漏れし易くなり、シール強度、剛性などが低下する。一方、７０ｇ／ｍ2 を超えると、粉漏れがし難くなるが、シール強度、剛性、厚みが大きくなり製袋加工性が低下する。
本発明の積層不織布の表面磨耗強度は、繰返し磨耗に対する耐久性を示すものであり、３級以上が必要であり、好ましくは４級〜５級である。磨耗強度が３級未満では、手に触ること、揉むことなどにより、繊維の毛羽立ちが起きるなどの問題が生じる。本発明の積層不織布の高い表面磨耗強度は、第３層に低融点繊維を配置することで、極細繊維層の熱接着効果と、該低融点繊維による熱接着効果が同時に作用し、これらの相乗的な熱接着効果により、部分熱圧着が良好に行われ、その結果、表面耐摩擦性の向上、耐毛羽性の向上につながったものである。
In the present invention, the composite sheet of laminated nonwoven fabric and thermoplastic film and its bag body can reduce fine particle leakage, widen the heat seal temperature range, have high heat seal strength, and excellent uniformity of formation. ing. The basis weight of the laminated nonwoven fabric is 10 to 70 g / m 2 , preferably 15 to 50 g / m 2 . If the basis weight is less than 10 g / m 2 , powder leakage is likely to occur, and the seal strength, rigidity, and the like are reduced. On the other hand, when it exceeds 70 g / m 2 , powder leakage is difficult to occur, but the sealing strength, rigidity, and thickness are increased, and the bag-making processability is lowered.
The surface abrasion strength of the laminated nonwoven fabric of the present invention indicates durability against repeated wear, and requires grade 3 or higher, preferably grade 4 to grade 5. If the wear strength is less than the third grade, problems such as fiber fluffing occur due to touching or rubbing. The high surface abrasion strength of the laminated nonwoven fabric of the present invention is that the low-melting fiber is disposed in the third layer, so that the thermal bonding effect of the ultrafine fiber layer and the thermal bonding effect by the low-melting fiber act simultaneously. Due to the effective thermal bonding effect, the partial thermocompression bonding is performed well, and as a result, the surface friction resistance and the fluff resistance are improved.
更に、本発明において、積層不織布の通気性を低くすること及び表面磨耗強度の向上を目的として、熱カレンダー加工、樹脂の塗布加工を行うことができる。例えば、温度１００〜２００℃の熱カレンダー加工により、熱圧着が増強し緻密化できる。また、アクリル系樹脂、ポリウレタン系樹脂、ポリエステル系樹脂などを０．５〜１５ｇ／ｍ2 の量を塗布することで、積層不織布の繊維間隙を更に小さくすることができる。
従って、上記の処理をすることで、使い捨てカイロの袋材となる複合シートの通気性を１００ｃｃ／ｃｍ2 ／ｓｅｃ以下、好ましくは５０ｃｃ／ｃｍ2 ／ｓｅｃ以下にすることができる。
Furthermore, in the present invention, thermal calendering and resin coating can be performed for the purpose of reducing the breathability of the laminated nonwoven fabric and improving the surface wear strength. For example, thermocompression bonding can be enhanced and densified by thermal calendering at a temperature of 100 to 200 ° C. Moreover, the fiber gap of a laminated nonwoven fabric can be made still smaller by apply | coating the quantity of 0.5-15 g / m < 2 >, such as an acrylic resin, a polyurethane-type resin, a polyester-type resin.
Therefore, by performing the above-described treatment, the air permeability of the composite sheet serving as the disposable warmer bag material can be made 100 cc / cm 2 / sec or less, preferably 50 cc / cm 2 / sec or less.
本発明の積層不織布の地合指数が２００以下であり、好ましくは１８０以下、より好ましくは６０〜１６０である。この値が低いことが、繊維分散の均一性が高いことであり、繊維分散があり、厚薄斑の多いと、地合指数が２００以上と大きくなる。本発明の積層不織布において、第１層及び第３層の繊維径の太い繊維の繊維間隙に、第２層の極細繊維層が該繊維間隙を被覆し、適度に埋める作用を有するため、構成繊維間隙がきわめて小さくでき、繊維の分散が極めて均一な積層不織布を得ることが出来、それにより上記の優れた地合い指数を得ることができ、その結果、細かい粒子の漏れを防ぐことができる。 The formation index of the laminated nonwoven fabric of the present invention is 200 or less, preferably 180 or less, more preferably 60 to 160. A low value means high uniformity of fiber dispersion. If there is fiber dispersion and there are many thick spots, the formation index becomes as large as 200 or more. In the laminated non-woven fabric of the present invention, since the fine fiber layer of the second layer covers the fiber gap of the fiber having a large fiber diameter of the first layer and the third layer, and has a function of appropriately filling the gap, the constituent fiber It is possible to obtain a laminated nonwoven fabric in which the gap is extremely small and the dispersion of the fibers is extremely uniform, thereby obtaining the above-mentioned excellent texture index, and as a result, leakage of fine particles can be prevented.
本発明の積層不織布の粉漏れ率は１０％以下であることが必要であり、好ましくは５％以下、より好ましくは３％以下である。粉漏れ率は、後述するように、ＪＩＳ規格の標準ダストの７種を約１０ｇ採取し、重量を測定（Ｗ１）し、振るい器を用いて、測定試料の上に定量したダストを載せ、セットした後、１０分間振動して、振るい器の下の測定試料を通過したダスト重量（Ｗ２）を測定して、（Ｗ２／Ｗ１）×１００の式より求めることができる。
本発明に用いられる発熱組成物は、酸素の存在下で発熱反応する組成物であり、例えば、鉄粉などの金属粉に、食塩、塩化カリウム、塩化マグネシュウム等の金属塩化物、硫酸カリウム、硫酸ソーダ、硫酸マグネシュウム等の金属硫酸塩、または他の反応助剤となりえる化合物、水及び水を吸収する保湿剤（例えば、活性炭、シリカゲル、木粉、リンター、吸水性樹脂等）ならびに必要に応じて添加剤などを混合した混合物が用いられる。
The powder leakage rate of the laminated nonwoven fabric of the present invention needs to be 10% or less, preferably 5% or less, more preferably 3% or less. As will be described later, the powder leakage rate is set by collecting about 10g of 7 types of JIS standard dust, measuring the weight (W1), placing the quantified dust on the measurement sample using a shaker, and setting After that, it is vibrated for 10 minutes, the dust weight (W2) that has passed through the measurement sample under the shaker is measured, and can be obtained from the formula of (W2 / W1) × 100.
The exothermic composition used in the present invention is a composition that undergoes an exothermic reaction in the presence of oxygen. For example, metal powder such as iron powder, metal chloride such as sodium chloride, potassium chloride, magnesium chloride, potassium sulfate, sulfuric acid Metal sulfates such as soda, magnesium sulfate, or other compounds that can be reaction aids, water and humectants that absorb water (eg, activated carbon, silica gel, wood flour, linter, water-absorbing resin, etc.) and as required A mixture in which additives and the like are mixed is used.
本発明を実施例などを用いて更に具体的に説明するが、本発明はこれら実施例などにより何ら限定されるものではない。
本発明における測定方法は以下のとおりである。
（１）目付（ｇ／ｍ2 ）：縦２０ｃｍ×横２５ｃｍの試料を３カ所切り取り、重量を測定し、その平均値を単位当たりの質量に換算して求める（ＪＩＳ−Ｌ−１９０６）。
（２）平均繊維径（μｍ）：顕微鏡で５００倍の拡大写真を取り、１０本の平均値で求める。
（３）通気性：ＪＩＳ−Ｌ−１９０６のフラジュール法に準拠して測定する。
The present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
The measuring method in the present invention is as follows.
(1) Weight per unit area (g / m 2 ): Three samples having a length of 20 cm and a width of 25 cm are cut out, the weight is measured, and the average value is converted into the mass per unit (JIS-L-1906).
(2) Average fiber diameter (μm): Take a 500-fold magnified photograph with a microscope, and determine the average value of 10 fibers.
(3) Breathability: Measured according to the fragile method of JIS-L-1906.
（４）粉漏れ率（％）：ＪＩＳ−Ｚ−８９０１試験用紛体７種ダストを約１０ｇを採り、重量Ｗ１を正確に測定し、２５ｃｍ角の試料を切り取り、振動機に取り付け、１０分間振動し、試料の通過したダスト重量Ｗ２を測定し、下記の式から求める。
粉漏れ率（重量％）＝（Ｗ２／Ｗ１）×１００
（５）表面摩擦強度（級）：学振型摩擦試験機を用い、摩擦子に測定する布を取り付け、荷重５００ｇで１００回往復摩擦した表面状態を目視観察して判定する。
５級：繊維の浮き、毛羽立ちがない。
４級：繊維の浮きがなく、毛羽立ちがあるが目立たない。
３級：繊維の浮き、毛羽立ちが少しあるが目立たない。
２級：繊維の浮き、毛羽立ちがあり、目立つ。
１級：繊維の浮き、毛羽立ちが甚だしい。
(4) Powder leakage rate (%): About 10 g of JIS-Z-8901 test powder 7 kinds of dust was taken, weight W1 was measured accurately, a 25 cm square sample was cut out, attached to a vibrator and vibrated for 10 minutes. Then, the dust weight W2 through which the sample has passed is measured and obtained from the following equation.
Powder leakage rate (% by weight) = (W2 / W1) × 100
(5) Surface friction strength (class): Using a Gakushin type friction tester, a cloth to be measured is attached to the friction element, and the surface state that is rubbed back and forth 100 times with a load of 500 g is visually observed and determined.
Grade 5: No fiber floating or fuzzing.
4th grade: There is no floating of fibers, and there is fluff but it is not noticeable.
3rd grade: There are some fibers floating and fluffing, but they are not noticeable.
2nd grade: There are fiber floating, fluffing and conspicuous.
1st grade: Floating and fluffing fibers.
（６）引張強度（Ｎ／５ｃｍ）：定長引張試験機を用い、試料幅５ｃｍ長さ３０ｃｍを切り取り、つかみ間隔２０ｃｍ、引張速度１０ｃｍ／ｍｉｎで、引張強度をタテ、ヨコ各々３カ所測定し、最大強度（タテ＋ヨコ）／２の平均値で示す。
（７）シール強度（Ｎ）：定長引張試験機を用い、試料幅２５ｍｍ長さ２００ｍｍを切り取り、熱シールし、充分冷却後、シール部分を約５０ｍｍ上下方向に剥離し、１８０度剥離するように各々取り付け、つかみ間隔１００ｍｍ、引張速度１０ｃｍ／ｍｉｎで、剥離強度をタテ、ヨコ各々３カ所測定し最大強度の平均値で示す。
但し、時間１秒間、圧力５５００ｋＰａ、シール面積７ｍｍ×２５ｍｍ、である。
(6) Tensile strength (N / 5 cm): Using a constant-length tensile tester, cut a sample width of 5 cm and a length of 30 cm, measure the tensile strength at 3 points each in the vertical and horizontal directions at a gripping interval of 20 cm and a tensile speed of 10 cm / min. The average value of maximum strength (vertical + horizontal) / 2 is shown.
(7) Seal strength (N): Using a constant-length tensile tester, cut a sample width of 25 mm and heat-seal, heat-seal, and after sufficient cooling, peel off the seal part about 50 mm in the vertical direction and peel 180 degrees The peel strength is measured at three vertical and horizontal positions at a grip interval of 100 mm and a tensile speed of 10 cm / min, and the average value of the maximum strength is indicated.
However, the time is 1 second, the pressure is 5500 kPa, and the seal area is 7 mm × 25 mm.
（８）地合指数：野村商事製（フォーメーションテスター、ＦＭＴ−Ｍ III）測定器を用い、サンプルを試料台の上に置き、二次元ＣＣＤカメラで照射ランプの透過像を捕らえ、３２０×３２０画素に分解し、それぞれの画素が受ける光の強さを測定する。次いで画素それぞれに対する透過率（ｔ）を下記の式で計算する。
絶対透過率（ｔ％）＝(Vt −Vr) ／(V100 −V0) ×１００％
V100：照射ランプ点灯の光度、V0：照射ランプの消灯の光度
Vt：試料をのせ、照射ランプ点灯の光度
Vr：試料をのせ、照射ランプ消灯の光度
絶対透過率(t%)は、E ＝２−logt に吸光度に換算され、
地合指数＝吸光度の変動係数×１０から求められる。
（９）ホットタック測定方法
H.W.Theller Inc. 製 Hot Tack Tester を用いて、シール圧力：5000kPa シール時間：０．５秒、剥離速度：200cm/min にてｎ＝３で測定した。ホットタック強度は、０．４秒後を採用した。
(8) Geometric index: Using a Nomura Shoji (formation tester, FMT-M III) measuring instrument, place the sample on the sample stage, capture the transmitted image of the irradiation lamp with a two-dimensional CCD camera, 320 x 320 pixels The intensity of light received by each pixel is measured. Next, the transmittance (t) for each pixel is calculated by the following equation.
Absolute transmittance (t%) = (Vt−Vr) / (V100−V0) × 100%
V100: Illumination lamp lighting intensity, V0: Irradiation lamp lighting intensity
Vt: The intensity of the irradiation lamp on the sample
Vr: The light intensity when the sample is placed and the irradiation lamp is extinguished. The absolute transmittance (t%) is converted to absorbance at E = 2−logt,
It is calculated | required from the formation index = the variation coefficient of a light absorbency x10.
(9) Hot tack measurement method
Using a Hot Tack Tester manufactured by HWTheller Inc., n = 3 was measured at a sealing pressure of 5000 kPa, a sealing time of 0.5 seconds, and a peeling speed of 200 cm / min. The hot tack strength was 0.4 seconds later.
［参考実施例１］
本発明の積層不織布の第３層が、スパンボンド用の２成分紡糸口金から、芯がポリエチレンテレフタレート、鞘が低密度ポリエチレン（融点１１５℃）の芯鞘構造の平均繊維径１５μｍ、目付け１５ｇ／ｍ2 複合繊維ウェブを作成し、第２層のポリエチレンテレフタレート（溶液粘度ηsp/c ０．５０）を用いメルトブロー用噴射口金から、紡糸温度３００℃、加熱エアは３２０℃で１０００Ｎｍ3 ／ｈｒで、平均繊維径２μｍ、目付け５ｇ／ｍ2 極細繊維ウェブを吐出して積層し、その上に第１層の一般的なポリエチレンテレフタレートをスパンボンド用紡糸口金から、紡糸温度３００℃で平均繊径１２μｍ、目付け１５ｇ／ｍ2 熱可塑性繊維ウェブを捕集ネット上に積層繊維ウェブとして積層し、さらに圧着面積率が２５％のエンボスロールを用いて、線圧３５０Ｎ／ｃｍ、上下ロール温度を２３０℃／１０５℃で熱圧着して実施例１の積層不織布（目付け３５ｇ／ｍ2 ）を得た。
次いで、低密度ポリエチレンフィルム２０μｍをＴ−ダイから押し出し、上記積層不織布と厚さ３０μｍの直鎖状ポリエチレンフィルムとを貼り合わせて本発明の複合シートを得た。
得られた積層不織布、複合シートの特性を表１に示す。表１の結果から、参考実施例１では、目付けが３５ｇ／ｍ2 と低目付けであったが、粉漏れ率、シール強度、地合指数、表面摩擦強度に優れた使い捨てカイロ用袋材であることが分る。
[ Reference Example 1]
The third layer of the laminated nonwoven fabric of the present invention is an average fiber diameter of 15 μm and a basis weight of 15 g / m of a core-sheath structure in which the core is polyethylene terephthalate and the sheath is low-density polyethylene (melting point: 115 ° C.). Two composite fiber webs were prepared, and the second layer of polyethylene terephthalate (solution viscosity ηsp / c 0.50) was used. From melt-spray nozzle, spinning temperature was 300 ° C, heated air was 320 ° C and 1000 Nm 3 / hr, average A fiber diameter of 2 μm and a basis weight of 5 g / m 2 An ultrafine fiber web is discharged and laminated, and a first layer of general polyethylene terephthalate is spun from a spinneret for spunbond at an average fiber diameter of 12 μm at a spinning temperature of 300 ° C. A 15 g / m 2 thermoplastic fiber web is laminated on a collection net as a laminated fiber web, and an embossing roll with a crimp area ratio of 25% is used. The laminated nonwoven fabric of Example 1 (weight per unit area: 35 g / m 2 ) was obtained by thermocompression bonding at a linear pressure of 350 N / cm and an upper and lower roll temperature of 230 ° C./105° C.
Next, 20 μm of a low density polyethylene film was extruded from a T-die, and the laminated nonwoven fabric and a linear polyethylene film having a thickness of 30 μm were bonded together to obtain a composite sheet of the present invention.
The properties of the obtained laminated nonwoven fabric and composite sheet are shown in Table 1. From the results of Table 1, in Reference Example 1, the basis weight was 35 g / m 2 and the basis weight was low, but this is a disposable warmer bag material excellent in powder leakage rate, seal strength, formation index, and surface friction strength. I understand that.
［実施例２］
本発明の第３層が、スパンボンド用の２成分紡糸口金から、芯がナイロン６６（ＰＡ６６、融点２６５℃）、鞘がナイロン６（ＰＡ６、融点２２３℃）の芯鞘構造の平均繊維径１７μｍ、目付け１７ｇ／ｍ2 複合繊維ウェブを作成し、第２層のナイロン６（ＰＡ６、融点２２０℃）を用いメルトブロー用噴射口金から、紡糸温度２８０℃、加熱エアを２８０℃で１０００Ｎｍ3 ／ｈｒで、平均繊径３μｍ、目付け６ｇ／ｍ2 極細繊維ウェブを吐出して積層し、その上にナイロン６６（ＰＡ６６、融点２６５℃）をスパンボンド用紡糸口金から、紡糸温度２８０℃で平均繊径１５μｍ、目付け１７ｇ／ｍ2 の熱可塑性繊維ウェブを捕集ネット上に積層繊維ウェブとして積層し、さらに圧着面積率が１５％のエンボスロールを用いて、線圧３５０Ｎ／ｃｍ、上下ロール温度を１８５℃／１８０℃で熱圧着して実施例２の積層不織布（目付け４０ｇ／ｍ2 ）を得た。
次いで、低密度ポリエチレンフィルム４０μｍをＴ−ダイから押し出し、上記積層不織布とを貼り合わせて本発明の複合シートを得た。
得られた積層不織布、複合シートの特性を表１に示す。表１の結果から、粉漏れ率、シール強度、地合指数、表面摩擦強度に優れたカイロ用袋材であることが分る。
[Example 2]
The third layer of the present invention is an average fiber diameter of 17 μm of a core-sheath structure in which the core is nylon 66 (PA66, melting point 265 ° C.) and the sheath is nylon 6 (PA6, melting point 223 ° C.) A composite fiber web having a basis weight of 17 g / m 2 was prepared, and a nylon 6 (PA6, melting point 220 ° C.) of the second layer was used, and a spinning temperature was 280 ° C. and heated air was 1000 Nm 3 / hr at a heating temperature of 280 ° C. An average fine diameter of 3 μm and a basis weight of 6 g / m 2 are spouted and laminated, and nylon 66 (PA66, melting point 265 ° C.) is spun from the spunbond spinneret at a spinning temperature of 280 ° C. and an average fine diameter of 15 μm. , by laminating a thermoplastic fiber web having a basis weight of 17 g / m 2 as a laminated fiber web on the collecting net, further crimping area ratio with 15% of the embossing roll, linear pressure 350 N / m, to obtain a vertical roll temperature of 185 ° C. / 180 ° C. thermocompression bonding to the second embodiment of a laminated nonwoven fabric (basis weight 40 g / m 2).
Subsequently, 40 μm of a low density polyethylene film was extruded from a T-die, and the laminated nonwoven fabric was bonded to obtain a composite sheet of the present invention.
The properties of the obtained laminated nonwoven fabric and composite sheet are shown in Table 1. From the results of Table 1, it can be seen that the bag material for warmers is excellent in powder leakage rate, seal strength, formation index, and surface friction strength.
［実施例３］
本発明の積層不織布の第３層が、スパンボンド用の２成分紡糸口金から、芯がポリエチレンテレフタレート、鞘がポリエステル共重合体（融点１６５℃）の芯鞘構造の平均繊維径１７μｍ、目付１３ｇ／ｍ2 の複合繊維ウェブを作成し、第２層のポリエチレンテレフタレート（溶液粘度ηsp/c＝０．５０）を用いメルトブロー用噴射口金から、紡糸温度３００℃、加熱エアは３２０℃で１０００Ｎｍ3 ／ｈｒで、平均繊径２μｍ、目付４ｇ／ｍ2 の極細繊維ウェブを吐出して積層し、その上に第１層の一般的なポリエチレンテレフタレートをスパンボンド用紡糸口金から、紡糸温度３００℃で平均繊径１４μｍ、目付１３ｇ／ｍ2 熱可塑性繊維ウェブを捕集ネット上に積層繊維ウェブとして積層し、さらに圧着面積率が２５％のエンボスロールを用いて、線圧３５０Ｎ／ｃｍ、上下ロール温度を２３０℃／１４５℃で熱圧着して実施例３の積層不織布を得た。
次いで、エチレン（メタ）アクリル酸共重合体フィルム１５μｍをＴ−ダイから押し出し、上記積層不織布と厚さ２５μｍの低密度ポリエチレンフィルムを貼り合わせて本発明の複合シートを得た。
得られた積層不織布、複合シートの特性を表１に示した。表１の結果から、粉漏れ率、シール強度、地合指数、表面摩擦強度の優れたカイロ用袋材であることが分る。
[Example 3]
The third layer of the laminated nonwoven fabric of the present invention is a two-component spinneret for spunbond, the core is a polyethylene terephthalate, the sheath is a polyester copolymer (melting point 165 ° C.), the core-sheath structure has an average fiber diameter of 17 μm, and the basis weight is 13 g / A composite fiber web of m 2 was prepared, and a polyethylene terephthalate (solution viscosity ηsp / c = 0.50) of the second layer was used, and the spinning temperature was 300 ° C. and the heating air was 1000 Nm 3 / hr at 320 ° C. Then, an ultrafine fiber web having an average fiber diameter of 2 μm and a basis weight of 4 g / m 2 is discharged and laminated, and a general polyethylene terephthalate of the first layer is sprinkled on the spunbond spinneret at an average fiber temperature of 300 ° C. diameter 14 [mu] m, by laminating a basis weight 13 g / m 2 thermoplastic fiber webs as the laminated fiber web on the collecting net, further use of the crimp area ratio of 25% embossing roll Te to obtain a linear pressure 350 N / cm, 230 the upper and lower roll temperature ° C. / 145 ° C. thermocompression bonding to a third embodiment of the laminated nonwoven fabric.
Next, 15 μm of an ethylene (meth) acrylic acid copolymer film was extruded from a T-die, and the laminated nonwoven fabric and a low-density polyethylene film having a thickness of 25 μm were bonded to obtain a composite sheet of the present invention.
The characteristics of the obtained laminated nonwoven fabric and composite sheet are shown in Table 1. From the results in Table 1, it can be seen that the bag material for Cairo has an excellent powder leakage rate, seal strength, formation index, and surface friction strength.
［実施例４］
本発明の積層不織布の第３層として、熱可塑繊維ウェブは、スパンボンド用紡糸口金から、ポリエステル共重合体（融点２１０℃）の平均繊維径１５μｍ、目付け２０ｇ／ｍ2 の繊維ウェブを作成し、第２層のポリエチレンテレフタレート（溶液粘度ηsp/c＝０．５０）を用い、メルトブロー用噴射口金から、紡糸温度３００℃、加熱エアは３２０℃で１０００Ｎｍ3 ／ｈｒで、平均繊維径２μｍ、目付け５ｇ／ｍ2 の極細繊維ウェブを吐出して積層し、その上に第１層の一般的なポリエチレンテレフタレートをスパンボンド用紡糸口金から、紡糸温度３００℃で平均繊径１４μｍ、目付け２０ｇ／ｍ2 の熱可塑性繊維ウェブを捕集ネット上に積層繊維ウェブとして積層し、さらに圧着面積率が２０％のエンボスロールを用い、線圧３５０Ｎ／ｃｍ、上下ロール温度を２３０℃／２０５℃で熱圧着して積層不織布（４５ｇ／ｍ2 ）を得た。
次いで、エチレン（メタ）アクリル酸共重合体フィルム２０μｍをＴ−ダイから押し出し、上記積層不織布と厚さ２０μｍの低密度ポリエチレンフィルムとを貼り合わせて本発明の複合シートを得た。
得られた積層不織布、複合シートの特性を表１に示す。表１の結果から、粉漏れ率、シール強度、地合指数、表面摩擦強度に優れてカイロ用包材であった。
[Example 4]
As the third layer of the laminated nonwoven fabric of the present invention, a thermoplastic fiber web is prepared from a spunbond spinneret, a fiber web having an average fiber diameter of 15 μm of polyester copolymer (melting point 210 ° C.) and a basis weight of 20 g / m 2. , Second layer polyethylene terephthalate (solution viscosity ηsp / c = 0.50), melt blown nozzle, spinning temperature 300 ° C., heated air at 320 ° C. and 1000 Nm 3 / hr, average fiber diameter 2 μm, basis weight A 5 g / m 2 ultrafine fiber web was discharged and laminated, and a first layer of general polyethylene terephthalate was spun from a spunbond spinneret at a spinning temperature of 300 ° C., an average fine diameter of 14 μm, and a basis weight of 20 g / m 2. Is laminated as a laminated fiber web on a collection net, and an embossing roll with a crimping area ratio of 20% is used, and a linear pressure of 350 N / cm To obtain a laminated nonwoven fabric (45g / m 2) upper and lower roll temperature by thermal compression bonding at 230 ℃ / 205 ℃.
Subsequently, 20 μm of an ethylene (meth) acrylic acid copolymer film was extruded from a T-die, and the laminated nonwoven fabric and a low-density polyethylene film having a thickness of 20 μm were bonded to obtain a composite sheet of the present invention.
The properties of the obtained laminated nonwoven fabric and composite sheet are shown in Table 1. From the results of Table 1, it was a warmer packaging material with excellent powder leakage rate, seal strength, formation index, and surface friction strength.
［比較例１］
一般的なポリエチレンテレフタレートを用い、実施例１と同じスパンボンド法で、紡糸温度３００℃で平均化繊維径１４μｍ、目付け３０ｇ／ｍ2 の熱可塑性繊維ウェブを捕集ネット上に作成し、圧着面積率が２０％のエンボスロールで、線圧３５０Ｎ／ｃｍ、上下ロール温度を２３０℃／２３５℃で熱圧着して不織布を得た。得られた不織布からなる袋材は、表１に示すように粉漏れ性が大きく、地合指数の高い、厚薄斑のあるものであった。次いで、低密度ポリエチレンフィルム４０μｍをＴ−ダイから押し出し、上記積層不織布とを貼り合わせて本発明の複合シートを得た。
[Comparative Example 1]
Using a general polyethylene terephthalate, a thermoplastic fiber web having an average fiber diameter of 14 μm and a basis weight of 30 g / m 2 at a spinning temperature of 300 ° C. by the same spunbond method as in Example 1 was formed on the collection net, and the crimping area A nonwoven fabric was obtained by thermocompression bonding with an embossing roll having a rate of 20% at a linear pressure of 350 N / cm and upper and lower roll temperatures of 230 ° C./235° C. As shown in Table 1, the obtained bag material made of nonwoven fabric had large powder leakage, a high formation index, and thick and thin spots. Subsequently, 40 μm of a low density polyethylene film was extruded from a T-die, and the laminated nonwoven fabric was bonded to obtain a composite sheet of the present invention.
［比較例２］
熱可塑繊維ウェブとしては、芯がポリエチレンテレフタレート、鞘が高密度ポリエチレンからなるスパンボンド法の複合繊維であって平均繊維径１６μｍ、目付け量を変えた複合繊維ウェブを、捕集ネット上に作成し、圧着面積率が２０％のエンボスロールで、線圧３５０Ｎ／ｃｍ、上下ロール温度を１２０℃／１１０℃で熱圧着して目付けが３０ｇ／ｍ2 の不織布を得た。
次いで、低密度ポリエチレンフィルム４０μｍをＴ−ダイから押し出し、上記積層不織布とを貼り合わせて本発明の複合シートを得た。
得られた不織布は、表１に示すように粉漏れ性が大きく低下し、且つ、熱シールができるがシールバーに低融点繊維が融着すること、粉漏れ性が大きく、地合指数の高い、厚薄斑のあるものであった。
[Comparative Example 2]
As the thermoplastic fiber web, a composite fiber web of spunbond method with a core made of polyethylene terephthalate and a sheath made of high-density polyethylene, with an average fiber diameter of 16 μm and a different basis weight was prepared on the collection net. A non-woven fabric having a basis weight of 30 g / m 2 was obtained by thermocompression bonding with an embossing roll having a crimping area ratio of 20% and a linear pressure of 350 N / cm and upper and lower roll temperatures of 120 ° C./110° C.
Subsequently, 40 μm of a low density polyethylene film was extruded from a T-die, and the laminated nonwoven fabric was bonded to obtain a composite sheet of the present invention.
As shown in Table 1, the obtained non-woven fabric has greatly reduced powder leakage and can be heat sealed, but the low melting point fibers are fused to the seal bar, the powder leakage is large, and the formation index is high. It was thick and thin.
上記参考実施例１、実施例２〜４、比較例１、２で得られた複合シートのヒートシール強度（Ｎ／２５ｍｍ）表２に、またホットタック強度（Ｎ／２５ｍｍ）を表２に示す。
本発明の使い捨てカイロは、粉漏れ性、熱シール加工性、シール強度、剛性などに優れているため、酸素の存在下で発熱する粉末、粒状物などの発熱組成物の袋材として、例えば、使い捨てカイロ、貼るカイロ、足用カイロなどに好ましく用いることができる。 The disposable body warmer of the present invention is excellent in powder leakage, heat seal processability, seal strength, rigidity, etc., so as a bag material for exothermic compositions such as powders and granules that generate heat in the presence of oxygen, for example, It can be preferably used for disposable body warmers, body warmers, foot warmers and the like.
Ｓ 高融点の熱可塑性繊維第１層
Ｍ メルトブロー法で得られた極細繊維第２層
Ｗ 低融点熱可塑性繊維第３層
Ｃ 繊維層不織布
ａ 低融点フィルム
ｂ 高融点フィルム（ホットメルト）
ｃ 通気孔
Ｂ ヒートシール部
S High-melting point thermoplastic fiber first layer M Ultrafine fiber second layer W obtained by melt blowing method Low-melting point thermoplastic fiber third layer C Fiber layer nonwoven fabric a Low-melting point film b High-melting point film (hot melt)
c Ventilation hole B Heat seal part
Claims (5)
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| JP5650894B2 (en) * | 2009-07-01 | 2015-01-07 | 旭化成せんい株式会社 | Disposable body warmer |
| JP4839401B2 (en) * | 2009-11-30 | 2011-12-21 | 日東ライフテック株式会社 | Cairo ventilation and Cairo |
| JP6034022B2 (en) * | 2011-12-27 | 2016-11-30 | 旭化成株式会社 | Nonwoven laminate |
| CN105213089B (en) * | 2015-11-04 | 2018-02-27 | 杭州奥格工业设计有限公司 | A kind of explosion-proof automatically ventilative electric hot-water bag |
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| JP2758833B2 (en) * | 1994-08-19 | 1998-05-28 | 旭化成工業株式会社 | Exothermic thermal insulation bag |
| JP2002209926A (en) * | 2001-01-17 | 2002-07-30 | Idemitsu Unitech Co Ltd | Pocket heater wrapping material and pocket heater bag |
| JP2004008564A (en) * | 2002-06-07 | 2004-01-15 | Kao Corp | Steam generation body |
| JP3646880B2 (en) * | 2002-07-09 | 2005-05-11 | 旭化成せんい株式会社 | Disposable heating equipment |
| JP4611827B2 (en) * | 2005-07-14 | 2011-01-12 | 旭化成せんい株式会社 | Non-woven for Cairo and Disposable Cairo |
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