JP6714982B2 - Bulky composite long fiber non-woven fabric - Google Patents
Bulky composite long fiber non-woven fabric Download PDFInfo
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- JP6714982B2 JP6714982B2 JP2015159588A JP2015159588A JP6714982B2 JP 6714982 B2 JP6714982 B2 JP 6714982B2 JP 2015159588 A JP2015159588 A JP 2015159588A JP 2015159588 A JP2015159588 A JP 2015159588A JP 6714982 B2 JP6714982 B2 JP 6714982B2
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Landscapes
- Absorbent Articles And Supports Therefor (AREA)
- Nonwoven Fabrics (AREA)
Description
本発明は、２種以上の熱可塑性樹脂からなる複合長繊維不織布に関する。より詳しくは、本発明は、衛生材料に適した、クッション性の柔らかさを有する嵩高性と高い強伸度を両立する前記複合長繊維不織布に関する。 The present invention relates to a composite long-fiber nonwoven fabric composed of two or more thermoplastic resins. More specifically, the present invention relates to the above composite long-fiber nonwoven fabric suitable for sanitary materials, which has both cushioning softness and bulkiness and high strength and elongation.
近年、使い捨てオムツの普及はめざましく、要求される品質や性能は向上していきている。特に、オムツ構成の中でトップシート、バックシートに求められる性能は柔らかさであり、また、大人用オムツでは介護を伴うこともあることから高強伸度が求められてきている。 In recent years, disposable diapers have been remarkably popularized, and required quality and performance have been improved. In particular, the performance required for the top sheet and the back sheet in the diaper structure is softness, and since the adult diaper may be accompanied by nursing care, high strength and elongation are required.
従来、オムツのトップシート、バックシートの高品質分野では短繊維が用いられることが多く、その製造には、カード法やエアレイ法による短繊維ウェブを熱風でボンディングするエアスルー方法が用いられており、クッション性の嵩高性を持った柔らかさを付与している。しかしながら、短繊維では繊維自身の伸度がほとんどなく、不織布としての強度、伸度は繊維接着点の強度に依存するため、強度と伸度を向上させる手段としてはボンディング温度を高くする必要があり、風合いが硬いものとなっている。 Conventionally, short fibers are often used in the high-quality field of diaper topsheets and backsheets, and the production thereof uses an air-through method of bonding a short fiber web by a card method or an air lay method with hot air, It imparts softness with a bulky cushioning property. However, with short fibers, there is almost no elongation of the fibers themselves, and the strength as a non-woven fabric and the elongation depend on the strength of the fiber bonding point, so it is necessary to raise the bonding temperature as a means for improving the strength and the elongation. The texture is hard.
スパンボンド方法による長繊維もトップシート、バックシートに用いられるものの、スパンボンドではその製造方法から高強伸度な不織布は得られるが、繊維が面方向に配列され、厚み方向を占有する繊維は少なく、嵩高性を得ることは困難であった。即ち、従来の長繊維不織布ではクッション性の柔らかさを有する嵩高性と高強伸度を両立させることは非常に困難である。 Although long fibers produced by the spunbond method are also used for topsheets and backsheets, spunbond produces a high-strength and non-woven fabric by the manufacturing method, but the fibers are arranged in the plane direction and few fibers occupy the thickness direction. However, it was difficult to obtain bulkiness. That is, it is very difficult for the conventional long-fiber non-woven fabric to achieve both bulkiness having cushioning softness and high elongation.
以下の特許文献１には、２成分からなるスパンボンド不織布の開示があるが、厚み方向に対する繊維配向と圧縮弾性に関する記載はなく、オムツ使用荷重下での嵩高性を維持することは困難である。 Patent Document 1 below discloses a spunbonded nonwoven fabric composed of two components, but there is no description about fiber orientation and compression elasticity in the thickness direction, and it is difficult to maintain bulkiness under a diaper use load. ..
また、以下の特許文献２には、厚み方向のクリンプを発現し、嵩高性を有した不織布の開示があるが、繊維配向に関する詳細な説明はなく、オムツとして実際に使用する際には、かかる荷重下ではクリンプは潰され、嵩高性を維持することは困難である。 Further, the following Patent Document 2 discloses a nonwoven fabric having a bulkiness, which expresses a crimp in the thickness direction, but there is no detailed description on fiber orientation, and when actually used as a diaper, the Under load, the crimp is crushed and it is difficult to maintain bulkiness.
さらに、以下の特許文献３には、配向指数をある範囲として繊維の熱伸長特性を利用した嵩高性を有する不織布の開示があるが、ここで開示されている配向指数は繊維内の繊維配向を示し、熱伸長特性に係る指標であって、不織布の３次元的な配向とは異なるものである。 Furthermore, the following Patent Document 3 discloses a non-woven fabric having bulkiness that utilizes the thermal elongation characteristics of fibers within a certain range of orientation index, but the orientation index disclosed here indicates the fiber orientation within the fiber. It is an index relating to the thermal elongation property and is different from the three-dimensional orientation of the nonwoven fabric.
かかる状況下、本発明が解決しようとする課題は、衛生材料に用いられる吸収性物品のトップシートやバックシート部に適した、クッション性の柔らかさを有する嵩高性と高い強伸度を両立する不織布を提供することである。 Under such circumstances, the problem to be solved by the present invention is suitable for the top sheet and back sheet part of absorbent articles used for sanitary materials, and achieves both bulkiness with high cushioning softness and high strength and elongation. A non-woven fabric is provided.
本発明者らは、前記課題を解決すべく鋭意検討し実験を重ねた結果、不織布の厚み方向の繊維配向を強くし、不織布としての圧縮弾性を強くすることで特定範囲の嵩密度を維持することが可能となり、オムツ着用時での潰れを抑制し、嵩高性を持ったクッション性のある柔らかさを不織布に発現させることができることを見出し、本発明を完成するに至ったものである。 As a result of intensive studies and experiments to solve the above problems, the inventors have strengthened the fiber orientation in the thickness direction of the nonwoven fabric and strengthened the compression elasticity of the nonwoven fabric to maintain a specific range of bulk density. It has become possible to suppress the crushing when wearing a diaper, and to make the nonwoven fabric express the softness with a bulky and cushioning property, thus completing the present invention.
また、本発明者らは、不織布の製造工程における接合前の不織ウェブの通気度、接合時の熱風温度と風速をある範囲とすることで、熱風が不織ウェブの嵩を維持した状態で貫通することができ、繊維交点での接着による強度発現と、嵩密度を特定範囲とすることができることを見出し、衛生材料に好適な不織布を製造することができることを見出し、本発明を完成するに至ったものである。 In addition, the present inventors set the air permeability of the nonwoven web before joining in the manufacturing process of the nonwoven fabric, the hot air temperature and the wind speed during joining within a certain range, so that the hot air maintains the bulk of the nonwoven web. In order to complete the present invention, it was found that it can be penetrated, strength development by adhesion at fiber intersections, and that the bulk density can be within a specific range, that a nonwoven fabric suitable for sanitary materials can be produced. It has come.
即ち、本発明は下記の通りのものである。
［１］２種以上の熱可塑性樹脂からなるサイドバイサイド型又は偏芯型複合長繊維不織布であって、該不織布のＸ線ＣＴでの厚み方向の配向指標が０．４３以下であり、目付が１０ｇ／ｍ２以上３０ｇ／ｍ２以下であり、破断強度が２５〜６０Ｎ／５ｃｍであり、破断伸度が２５〜８０％であり、タフネス指標が４０以上であり、かつ、嵩密度が０．０１〜０．０７ｇ／ｃｍ３であることを特徴とする前記複合長繊維不織布。
That is, the present invention is as follows.
[1] A side-by-side type or eccentric type composite long-fiber nonwoven fabric made of two or more thermoplastic resins, wherein the orientation index in the thickness direction in X-ray CT of the nonwoven fabric is 0.43 or less, and the basis weight is 10 g. /M 2 or more and 30 g/m 2 or less, breaking strength is 25 to 60 N/5 cm, breaking elongation is 25 to 80%, toughness index is 40 or more, and bulk density is 0.01. The composite long-fiber nonwoven fabric is characterized in that it is about 0.07 g/cm 3 .
［２］前記複合長繊維不織布の圧縮仕事量ＷＣが０．２０〜０．７０ｇｆ・ｃｍ／ｃｍ２である、前記［１］に記載の複合長繊維不織布。 [2] The composite continuous fiber nonwoven fabric according to [1], wherein the composite continuous fiber nonwoven fabric has a compression work WC of 0.20 to 0.70 gf·cm/cm 2 .
［３］前記複合長繊維不織布の通気度が３００〜７００ｃｍ３／ｃｍ２／ｓである、前記［１］又は［２］に記載の複合長繊維不織布。 [3] The composite continuous fiber nonwoven fabric according to the above [1] or [2], wherein the composite continuous fiber nonwoven fabric has an air permeability of 300 to 700 cm 3 /cm 2 /s.
［４］前記複合長繊維の捲縮数が５〜４５個／インチである、前記［１］〜［３］のいずれかに記載の複合長繊維不織布。 [4] The composite continuous fiber nonwoven fabric according to any one of [1] to [3], wherein the number of crimps of the composite continuous fiber is 5 to 45 pieces/inch.
［５］前記複合長繊維がポリオレフィン系繊維からなる、前記［１］〜［４］のいずれかに記載の複合長繊維不織布。 [ 5 ] The composite continuous fiber nonwoven fabric according to any one of [1] to [ 4 ], wherein the composite continuous fiber is a polyolefin fiber.
［６］親水化剤を含有する、前記［１］〜［５］のいずれかに記載の複合長繊維不織布。 [ 6 ] The composite long-fiber nonwoven fabric according to any one of [1] to [ 5 ], which contains a hydrophilizing agent.
［７］前記［１］〜［６］のいずれかに記載の複合長繊維不織布を含む衛生材料。 [ 7 ] A sanitary material containing the composite long-fiber nonwoven fabric according to any one of [1] to [ 6 ].
本発明の不織布は、クッション性の柔らかさを有する嵩高性、高い強伸度、透水性を有するため、衛生材料のトップシート、バックシートに好適に利用可能である。 INDUSTRIAL APPLICABILITY The nonwoven fabric of the present invention is suitable for use as a topsheet or backsheet for sanitary materials because it has a cushioning softness, bulkiness, high strength and elongation, and water permeability.
以下、本発明の実施形態を詳細に説明する。
本実施形態の不織布を構成する複合長繊維は２種以上の熱可塑性樹脂の組み合わせからなる。熱可塑性樹脂としては、例えば、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ィン系樹脂、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樹脂、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樹脂、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樹脂などが用いられる。前記熱可塑性樹脂の何れの組合せでも構わないが、繊維同士の接合の面から融点差のある熱可塑性樹脂の組合せが好ましい。
Hereinafter, embodiments of the present invention will be described in detail.
The composite continuous fiber constituting the nonwoven fabric of the present embodiment is composed of a combination of two or more kinds of thermoplastic resins. Examples of the thermoplastic resin include polyolefin resins such as polyethylene, polypropylene and copolymer polypropylene, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and copolymer polyester, nylon-6, nylon-66, copolymer resins. Polyamide-based resins such as polymerized nylon, biodegradable resins such as polylactic acid, polybutylene succinate, and polyethylene succinate are used. Any combination of the above-mentioned thermoplastic resins may be used, but a combination of thermoplastic resins having a difference in melting point from the viewpoint of joining fibers is preferable.
風合いの観点からは、ポリオレフィン系樹脂を組み合わせて用いることが好ましい。例えば、ポリエチレン、ポリプロピレン又はそれらのモノマーと他のα−オレフィンとの共重合体などの樹脂からなる複合繊維が挙げられる。他のα−オレフィンとしては、炭素数３〜１０のものであり、具体的にはプロピレン、１−ブテン、１−ペンテン、１−ヘキサン、４−メチル−１−ペンテン、１−オクテンなどが挙げられる。 From the viewpoint of texture, it is preferable to use a polyolefin resin in combination. For example, a composite fiber made of a resin such as polyethylene, polypropylene or a copolymer of a monomer thereof and another α-olefin may be used. Other α-olefins are those having 3 to 10 carbon atoms, and specific examples include propylene, 1-butene, 1-pentene, 1-hexane, 4-methyl-1-pentene, 1-octene and the like. To be
本実施形態の熱可塑性複合繊維の繊維形状はサイドバイサイド型（Ｓ／Ｓ）又は偏芯型（偏Ｓ／Ｃ）であることが、捲縮糸を容易に得られることから好ましい。偏芯型の芯部は繊維表面に出ていてもよく、繊維表面における芯部の占める面積率は０〜５０％であることが好ましく、より好ましくは０〜３０％である。繊維表面を形成する芯部の比率が低い程、接着に起因する鞘部の比率が高くなり、高い強度と毛羽抑制性が得られるものとなる。 The fiber shape of the thermoplastic conjugate fiber of the present embodiment is preferably a side-by-side type (S/S) or an eccentric type (biased S/C) because a crimped yarn can be easily obtained. The eccentric core may be exposed on the fiber surface, and the area ratio of the core on the fiber surface is preferably 0 to 50%, more preferably 0 to 30%. The lower the ratio of the core portion forming the fiber surface, the higher the ratio of the sheath portion due to the adhesion, and the higher the strength and the fluff suppressing property.
また、繊維の強度の観点から、熱可塑性樹脂の組合せにおいて、融点差の高い方の樹脂が繊維内に占める重量比率は、好ましくは２５ｗｔ％以上８０ｗｔ％以下であり、より好ましくは３０ｗｔ％以上８０ｗｔ％以下、更に好ましくは５０ｗｔ％以上７０ｗｔ％以下である。
繊維形状は通常の円形繊維のみでなく、異形繊維などの特殊形態の繊維であってよい。
From the viewpoint of fiber strength, in the combination of thermoplastic resins, the weight ratio of the resin having the higher melting point in the fiber is preferably 25 wt% or more and 80 wt% or less, more preferably 30 wt% or more and 80 wt% or less. % Or less, and more preferably 50 wt% or more and 70 wt% or less.
The fiber shape is not limited to a normal circular fiber, but may be a specially shaped fiber such as a modified fiber.
２種の熱可塑性樹脂で複合長繊維を形成する場合、第１成分はポリプロピレン、第２成分はポリエチレンであることが好ましい。複合繊維が偏芯型の場合は、芯部を第１成分、鞘部を第２成分とすることが好ましい。ポリプロピレンは、強度が強く使用時において破断しにくく、且つ衛生材料の生産時における寸法安定性に優れることから、好ましい。 When the composite long fiber is formed of two kinds of thermoplastic resins, it is preferable that the first component is polypropylene and the second component is polyethylene. When the conjugate fiber is an eccentric type, it is preferable that the core part is the first component and the sheath part is the second component. Polypropylene is preferable because it has high strength, is less likely to break during use, and has excellent dimensional stability during production of sanitary materials.
前記２種の熱可塑性樹脂で形成する場合の第１成分のポリプロピレンは、一般的なチーグラナッタ触媒により合成されるポリマーでもよいし、メタロセンに代表されるシングルサイト活性触媒により合成されたポリマーであってもよく、また、エチレンランダム共重合ポリプロピレンでもよい。これらは単独でも２種類以上を組み合わせてもよい。特に、風合い、強度、寸法安定性の観点から、ホモポリプロピレンを主成分とするものであることが好ましい。
また、ポリプロピレンのＭＦＲは、好ましくは２０ｇ／１０分以上、より好ましくは３０ｇ／１０分超え、更に好ましくは４０ｇ／１０分超え、最も好ましくは５３ｇ／１０分を超えである。他方、ポリプロピレンのＭＦＲは、好ましくは８５ｇ／１０分以下、より好ましくは７０ｇ／１０分以下、更に好ましくは、６０ｇ／１０分以下である。ＭＦＲは、ＪＩＳ−Ｋ７２１０「プラスチック−熱可塑性プラスチックのメルトマスフローレイト（ＭＦＲ）及びメルトボリュームフローレイト（ＭＶＲ）の試験方法」の表１、試験温度２３０℃、試験荷重２．１６ｋｇに準じて測定を行い求めた。
The polypropylene as the first component in the case of forming the two kinds of thermoplastic resins may be a polymer synthesized by a general Ziegler-Natta catalyst or a polymer synthesized by a single-site active catalyst represented by metallocene. It may be ethylene random copolymer polypropylene. These may be used alone or in combination of two or more. In particular, from the viewpoint of feeling, strength and dimensional stability, it is preferable that the main component is homopolypropylene.
The MFR of polypropylene is preferably 20 g/10 minutes or more, more preferably 30 g/10 minutes or more, further preferably 40 g/10 minutes or more, and most preferably 53 g/10 minutes or more. On the other hand, the MFR of polypropylene is preferably 85 g/10 minutes or less, more preferably 70 g/10 minutes or less, still more preferably 60 g/10 minutes or less. MFR is measured according to JIS-K7210 "Plastics-Test methods for melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastics", Table 1, test temperature 230°C, test load 2.16 kg. I asked.
前記２種の熱可塑性樹脂で形成する場合の第２成分のポリエチレンは、繊維同士の接合後の接着強度が強く、不織布としての風合いが良いため衛生材料に好適に利用できる。ポリエチレンは、一般的なチーグラナッタ触媒により合成されるポリマーでもよいし、メタロセンに代表されるシングルサイト活性触媒により合成されたポリマーであってもよい。ポリエチレンは高密度ポリエチレン、直鎖状低密度ポリエチレンであることが好ましく、密度は０．９２〜０．９７ｇ／ｃｍ３であることが好ましく、より好ましくは０．９２５〜０．９６ｇ／ｃｍ３である。 The polyethylene, which is the second component in the case of being formed of the two types of thermoplastic resins, has a strong adhesive strength after the fibers are joined together and has a good texture as a nonwoven fabric, and thus can be suitably used as a sanitary material. Polyethylene may be a polymer synthesized by a general Ziegler-Natta catalyst or a polymer synthesized by a single-site active catalyst represented by metallocene. The polyethylene is preferably high-density polyethylene or linear low-density polyethylene, and the density thereof is preferably 0.92 to 0.97 g/cm 3 , more preferably 0.925 to 0.96 g/cm 3 . is there.
ポリエチレンのＭＩは、好ましくは１０ｇ／１０分以上、より好ましくは１５ｇ／１０分超えである。他方、ポリエチレンのＭＩは、好ましくは１００ｇ／１０分以下、より好ましくは６０ｇ／１０分以下、更に好ましくは、４０ｇ／１０分以下である。ＭＩは、ＪＩＳ−Ｋ７２１０「プラスチック−熱可塑性プラスチックのメルトマスフローレイト（ＭＦＲ）及びメルトボリュームフローレイト（ＭＶＲ）の試験方法」の表１、試験温度１９０℃、試験荷重２．１６ｋｇに準じて測定を行い求めた。 The MI of polyethylene is preferably 10 g/10 minutes or more, more preferably 15 g/10 minutes or more. On the other hand, the MI of polyethylene is preferably 100 g/10 minutes or less, more preferably 60 g/10 minutes or less, and further preferably 40 g/10 minutes or less. MI is measured according to JIS-K7210 "Plastics-Test methods for melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastics", Table 1, test temperature 190°C, test load 2.16 kg. I asked.
本実施形態の不織布は、強度及び生産性の観点から、スパンボンド法により形成された複合長繊維不織ウェブであることが好ましい。例えば、複合長繊維は、２つ以上の異なる押出機からそれぞれ異なる熱可塑性樹脂を溶融押出し、多数の紡糸孔を有する紡糸口金から２種以上の熱可塑性樹脂が複合された状態で糸条として吐出される。次いで、吐出された糸条を５℃〜２０℃に制御した冷風をあて冷却しながら牽引する。糸条は搬送コンベア上に堆積され不織ウェブとして搬送される。搬送中の不織ウェブは積層され、多層積層の不織ウェブとしてもよい。 From the viewpoint of strength and productivity, the nonwoven fabric of the present embodiment is preferably a composite long fiber nonwoven web formed by the spunbond method. For example, in the case of the composite long fiber, different thermoplastic resins are melt-extruded from two or more different extruders, and two or more kinds of thermoplastic resins are discharged as a yarn from a spinneret having a large number of spinning holes. To be done. Then, the discharged yarn is pulled while being cooled by applying cold air controlled at 5°C to 20°C. The yarns are deposited on a conveyor and conveyed as a nonwoven web. The nonwoven webs in transit may be laminated to provide a multilayer laminated nonwoven web.
熱可塑性複合繊維で構成された不織ウェブを接合して不織布となす場合の接合手段としては、繊維同士の交点が溶融し接着できる温度以上に加熱する方法であれば特に限定されるものではない。加熱する方法としては、熱風循環型、熱風貫通型、赤外線ヒーター型、不織布の両面に熱風を吹き付ける方法、あるいは加熱気体中に導入する方法等、各種加熱方法が挙げられる。繊維同士の交点でより多くの繊維接着点が得られ且つ不織布の破断強度が高くなる観点から、熱風による加熱が好ましく、熱風貫通型がより好ましい。 The joining means for joining a nonwoven web made of thermoplastic composite fibers to form a nonwoven fabric is not particularly limited as long as it is a method of heating at a temperature at which the intersections of the fibers melt and can be bonded. .. Examples of the heating method include various heating methods such as a hot air circulation type, a hot air penetrating type, an infrared heater type, a method of blowing hot air onto both surfaces of the nonwoven fabric, or a method of introducing the hot air into heated gas. From the viewpoint of obtaining more fiber bonding points at the intersections of the fibers and increasing the breaking strength of the nonwoven fabric, heating with hot air is preferable, and hot air penetration type is more preferable.
熱風の温度としては、組み合わせた熱可塑性樹脂の中でも、融点が低く且つ接合に寄与する熱可塑性樹脂に適した温度に調整することが好ましい。例えば、該熱可塑性樹脂がポリエチレンの場合、ポリエチレンが溶融し接着する１３０〜１５５℃であり、好ましくは１３５〜１５５℃、更に好ましくは１４０℃〜１５０℃である。接着温度がこの範囲であれば繊維同士の交点で繊維同士の接着が発現し、不織布としての強度を発現することが可能となる。 The temperature of the hot air is preferably adjusted to a temperature suitable for the thermoplastic resin that has a low melting point and contributes to bonding among the combined thermoplastic resins. For example, when the thermoplastic resin is polyethylene, the melting point of polyethylene is 130 to 155°C, preferably 135 to 155°C, and more preferably 140°C to 150°C. When the bonding temperature is within this range, the fibers are bonded to each other at the intersections of the fibers, and the strength of the nonwoven fabric can be expressed.
熱風の風速は０．５〜３．０ｍ／ｓであり、好ましくは０．７〜２．５ｍ／ｓ、更に好ましくは２．０ｍ／ｓ以下である。本実施形態の不織ウェブを熱風により接合する場合は、不織ウェブの通気度が大きく影響する。不織ウェブの通気度が低すぎると熱風は貫通しにくく、不織布としての均一な接合は得られにくい。また、得られる不織布の強度保持の観点から、通気度は高すぎても好ましくない。接合後、強度を満足に保持でき、最終的に得られる不織布の通気度としては、３００ｃｍ３／ｃｍ２／ｓ以上７００ｃｍ３／ｃｍ２／ｓ以下が好ましく、３００ｃｍ３／ｃｍ２／ｓ以上６５０ｃｍ３／ｃｍ２／ｓ以下がより好ましい。 The wind speed of the hot air is 0.5 to 3.0 m/s, preferably 0.7 to 2.5 m/s, and more preferably 2.0 m/s or less. When joining the nonwoven web of this embodiment by hot air, the air permeability of a nonwoven web has a big influence. If the air permeability of the nonwoven web is too low, it is difficult for hot air to penetrate, and it is difficult to obtain uniform bonding as a nonwoven fabric. Further, from the viewpoint of maintaining the strength of the obtained nonwoven fabric, it is not preferable that the air permeability is too high. The strength of the nonwoven fabric after joining can be satisfactorily maintained, and the finally obtained nonwoven fabric has an air permeability of preferably 300 cm 3 /cm 2 /s or more and 700 cm 3 /cm 2 /s or less, and more preferably 300 cm 3 /cm 2 /s or more and 650 cm. It is more preferably 3 /cm 2 /s or less.
本実施形態では、不織布の接合前の不織ウェブにエンボス加工で熱接着を施すことがある。エンボス加工は、金属エンボスロールと金属フラットロールの組合せの一対のロールに通して加工することが生産性の面から好ましい。不織ウェブの形態保持や最終的に得られる不織布の強度の観点から、エンボス面積率は、好ましくは５〜３０％、より好ましくは５〜２０％、更に好ましくは６〜１５％である。また、エンボスの深さは深いほど、不織布の柔らかさを得ることが可能であり、好ましくは０．５〜２．０ｍｍ、より好ましくは０．７〜１．５ｍｍである。エンボス形状は特に限定されないが、円形状、楕円形状、ダイヤ形状、矩形状であることが好ましく、衛生材料に好適に用いる柔らかさと適度な強度及び伸度を有する不織布を得ることができるものであることができる。
更に本実施形態では、不織布ウェブ搬送時のメクレや吹き飛びを抑制するために、仮接着を行うことがある。仮接着の方法としては、一対のロールを通して加工する方法や嵩保持の観点から熱風エアを吹き付ける方法、熱風エアを貫通する方法などが挙げられる。熱風エアを用いる場合は熱風の温度は不織布の接合温度の好ましくは−３０℃〜０℃であり、より好ましくは−２０℃〜０℃であり、更に好ましくは−１０℃〜−５℃である。熱風温度がこの範囲であると、搬送時メクレを抑制することができ、嵩を潰すことが無く嵩を保持した不織ウェブを得ることができる。
In the present embodiment, the non-woven nonwoven web may be heat-bonded by embossing before joining. From the viewpoint of productivity, it is preferable to perform the embossing by passing through a pair of rolls of a combination of a metal embossing roll and a metal flat roll. The embossed area ratio is preferably 5 to 30%, more preferably 5 to 20%, still more preferably 6 to 15%, from the viewpoint of maintaining the shape of the nonwoven web and the strength of the finally obtained nonwoven fabric. Further, the deeper the embossing depth, the softer the nonwoven fabric can be obtained, preferably 0.5 to 2.0 mm, more preferably 0.7 to 1.5 mm. The embossed shape is not particularly limited, but it is preferably circular, elliptical, diamond-shaped, or rectangular, and it is possible to obtain a non-woven fabric having softness and suitable strength and elongation suitable for use in sanitary materials. be able to.
Further, in the present embodiment, temporary adhesion may be performed in order to suppress blurring and blow-off when the nonwoven web is conveyed. Examples of the temporary adhesion method include a method of processing through a pair of rolls, a method of blowing hot air from the viewpoint of maintaining bulk, and a method of penetrating hot air. When hot air is used, the temperature of the hot air is preferably -30°C to 0°C, more preferably -20°C to 0°C, and further preferably -10°C to -5°C, which is the bonding temperature of the nonwoven fabric. .. When the hot air temperature is within this range, it is possible to suppress clogging during transportation, and it is possible to obtain a nonwoven web that retains bulk without crushing bulk.
本実施形態の不織布の破断強度は２５Ｎ／５ｃｍ以上６０Ｎ／５ｃｍ以下であり、且つ破断伸度は２５％以上８０％以下である。また、タフネス指標は以下の式（１）：
タフネス指標＝破断強度（Ｎ／５ｃｍ）×破断伸度（％）／目付（ｇ／ｍ２）
…式（１）
で算出され、４０以上であり、好ましくは５０以上である。上限は、好ましくは２５０以下、より好ましくは２００以下、更に好ましくは１５０以下である。
破断強度、破断伸度、及びタフネス指標がこの範囲であると、不織布の加工性の面や衛生材料として使用に適した範囲となる。
The breaking strength of the nonwoven fabric of the present embodiment is 25 N/5 cm or more and 60 N/5 cm or less, and the breaking elongation is 25% or more and 80% or less. Further, the toughness index is the following formula (1):
Toughness index = breaking strength (N/5 cm) x breaking elongation (%) / basis weight (g/m 2 ).
... Formula (1)
And is 40 or more, preferably 50 or more. The upper limit is preferably 250 or less, more preferably 200 or less, still more preferably 150 or less.
When the breaking strength, the breaking elongation, and the toughness index are within this range, the nonwoven fabric has a workability and a range suitable for use as a sanitary material.
本実施形態の不織布を構成する複合長繊維の平均単糸繊度は０．５ｄｔｅｘ以上１０．０ｄｔｅｘ以下であることが好ましく、より好ましくは０．７ｄｔｅｘ以上８．０ｄｔｅｘ以下、更に好ましくは０．９ｄｔｅｘ以上５．０ｄｔｅｘ以下である。紡糸安定性の観点から、平均単糸繊度は、０．５ｄｔｅｘ以上であることが好ましく、衛生材料に使用される不織布の風合いの観点から、１０．０ｄｔｅｘ以下であることが好ましい。 The average single yarn fineness of the composite long fibers constituting the nonwoven fabric of the present embodiment is preferably 0.5 dtex or more and 10.0 dtex or less, more preferably 0.7 dtex or more and 8.0 dtex or less, and further preferably 0.9 dtex or more. It is 5.0 dtex or less. From the viewpoint of spinning stability, the average single yarn fineness is preferably 0.5 dtex or more, and from the viewpoint of the texture of the nonwoven fabric used for sanitary materials, it is preferably 10.0 dtex or less.
前記複合長繊維は不織布の風合いと嵩高を保持する為に、らせん状の捲縮を有していることが好ましい。該繊維の捲縮数は５個／インチ以上４５個／インチ以下が好ましく、より好ましくは１０個／インチ以上４０個／インチ以下である。捲縮数が５個／インチ未満であると得られる不織布の嵩高が不足し、４５個／インチを超えると得られる不織布の繊維分散ムラにより見栄えを損なってしまう。 The composite long fibers preferably have a spiral crimp in order to maintain the texture and bulkiness of the nonwoven fabric. The number of crimps of the fiber is preferably 5 or more and 45 or less, and more preferably 10 or more and 40 or less. When the number of crimps is less than 5 pieces/inch, the bulkiness of the obtained nonwoven fabric is insufficient, and when it exceeds 45 pieces/inch, the appearance of the nonwoven fabric is impaired due to uneven fiber dispersion.
本実施形態の不織布の目付は８ｇ／ｍ２以上８０ｇ／ｍ２以下が好ましく、より好ましくは１０ｇ／ｍ２以上４０ｇ／ｍ２以下、更に好ましくは１０ｇ／ｍ２以上３０ｇ／ｍ２以下である。８ｇ／ｍ２以上であれば衛生材料に使用される不織布としては強力を満足し、８０ｇ／ｍ２以下であれば衛生材料に使用される不織布の柔軟性を満足し、外観的に厚ぼったい印象を与えない。 The nonwoven fabric of the present embodiment has a basis weight of preferably 8 g/m 2 or more and 80 g/m 2 or less, more preferably 10 g/m 2 or more and 40 g/m 2 or less, and further preferably 10 g/m 2 or more and 30 g/m 2 or less. .. If it is 8 g/m 2 or more, the nonwoven fabric used as a sanitary material is strong, and if it is 80 g/m 2 or less, the flexibility of the nonwoven fabric used as a sanitary material is satisfied, and the appearance is thick. Do not give.
本実施形態の不織布のＸ線ＣＴによる配向指標は０．４３以下であり、好ましくは０．４２５以下である。Ｘ線ＣＴによる配向指数がこの範囲であると不織布の厚み方向を占有する繊維が多くなり、荷重下においても嵩が潰れることがなく、嵩高性を有する不織布となり、優れたクッション性を持つ不織布を得ることが可能となる。下限は低ければ低い方がよいが、好ましくは０．３０以上、より好ましくは０．３３以上である。 The orientation index by X-ray CT of the nonwoven fabric of the present embodiment is 0.43 or less, preferably 0.425 or less. When the orientation index by X-ray CT is in this range, a large number of fibers occupy the thickness direction of the non-woven fabric, the bulk does not collapse even under load, the non-woven fabric becomes bulky, and the non-woven fabric having excellent cushioning property is obtained. It becomes possible to obtain. The lower limit is preferably as low as possible, but it is preferably 0.30 or more, more preferably 0.33 or more.
不織布の厚み方向の繊維配向を高くするためには、不織布の接合工程における熱風温度と風速、不織ウェブの通気度を制御することが重要である。熱風温度が高いと繊維表面の溶解度が非常に高くなり、風合いの硬いものとなる。熱風風速が速いと熱風は貫通するが、繊維も同時に潰れてしまい嵩の低い不織布となってしまう。更に不織ウェブの通気度が低過ぎると熱風は貫通せず、高過ぎると熱風が繊維交点へ充分に溶解する熱がかからなくなるため嵩と強度を両立する繊維接着点を形成することが困難となる。 In order to increase the fiber orientation in the thickness direction of the non-woven fabric, it is important to control the hot air temperature and air velocity in the joining process of the non-woven fabric and the air permeability of the non-woven web. When the hot air temperature is high, the solubility of the fiber surface becomes very high, and the texture becomes hard. When the hot air velocity is high, the hot air penetrates, but the fibers are also crushed at the same time, resulting in a low bulk nonwoven fabric. Further, if the air permeability of the nonwoven web is too low, hot air does not penetrate, and if it is too high, it is difficult to form fiber adhesion points that balance bulk and strength because the hot air does not have sufficient heat to dissolve at the fiber intersections. Becomes
本実施形態の不織布の嵩密度は０．０１ｇ／ｃｍ３以上０．０７ｇ／ｃｍ３以下の範囲であり、強度の観点から０．０１ｇ／ｃｍ３以上がより好ましく、風合いの観点から０．０７ｇ／ｃｍ３以下とすることが好ましい。 The bulk density of the nonwoven fabric of the present embodiment is in the range of 0.01 g/cm 3 or more and 0.07 g/cm 3 or less, more preferably 0.01 g/cm 3 or more from the viewpoint of strength, and 0.07 g from the viewpoint of texture. /Cm 3 or less is preferable.
本実施形態の不織布の圧縮仕事量ＷＣは０．２５ｇｆ・ｃｍ／ｃｍ２以上０．７０ｇｆ・ｃｍ／ｃｍ２以下であることが好ましい。この範囲の圧縮仕事量ＷＣを保持することは、衛生材料に使用される不織布としてのクッション性の観点から、好ましい。 The compression work WC of the nonwoven fabric of the present embodiment is preferably 0.25 gf·cm/cm 2 or more and 0.70 gf·cm/cm 2 or less. It is preferable to keep the compression work WC within this range from the viewpoint of the cushioning property of the nonwoven fabric used for sanitary materials.
本実施形態の不織布には親水化剤が含有されていてもよい。使用される親水化剤としては、人体への安全性、工程での安全性等を考慮して、高級アルコール、高級脂肪酸、アルキルフェノール等のエチレンオキサイドを付加した非イオン系活性剤、アルキルフォスフェート塩、アルキル硫酸塩等のアニオン系活性剤等が挙げられ、これらは、単独で又は混合物として用いられる。 The non-woven fabric of the present embodiment may contain a hydrophilizing agent. As the hydrophilizing agent used, a nonionic activator added with ethylene oxide such as a higher alcohol, a higher fatty acid, or an alkylphenol, or an alkyl phosphate salt in consideration of safety for human body and safety in the process. , An anionic activator such as alkyl sulfate, and the like, and these are used alone or as a mixture.
親水化剤を含有させる方法としては、通常、希釈した親水化剤を用いて、浸漬法、噴霧法、コーティング（キスコーター、グラビアコーター）法等の既存の方法を採用でき、必要により予め混合した親水化剤を、水等の溶媒で希釈して塗布することが好ましい。 As a method for incorporating a hydrophilizing agent, usually, a dilute hydrophilizing agent can be used, and an existing method such as a dipping method, a spraying method, or a coating (kiss coater, gravure coater) method can be adopted. It is preferable that the agent is diluted with a solvent such as water and then applied.
親水化剤を水等の溶媒で希釈して塗布すると、乾燥工程を必要とする場合がある。その際の乾燥方法としては、対流伝熱、伝導伝熱、放射伝熱等を利用した既知の方法を採用でき、熱風や赤外線による乾燥や熱接触による乾燥方法等を用いることができる。 When the hydrophilic agent is diluted with a solvent such as water and applied, a drying step may be required. As a drying method at that time, a known method using convective heat transfer, conductive heat transfer, radiant heat transfer, or the like can be adopted, and a drying method by hot air or infrared rays, a drying method by thermal contact, or the like can be used.
親水化剤の付着量は、要求される性能によって異なるが、通常は、繊維に対して０．０５重量％以上１．００重量％以下の範囲が好ましく、より好ましくは０．１５重量％以上０．８重量％以下、更に好ましくは０．２重量％以上０．６重量％以下である。付着量がこの範囲にあると、衛生材料のトップシートとしての親水性能を満足し、加工適正も良好となる。 The amount of the hydrophilic agent attached varies depending on the required performance, but is generally preferably in the range of 0.05% by weight or more and 1.00% by weight or less, more preferably 0.15% by weight or more 0 It is 0.8 wt% or less, more preferably 0.2 wt% or more and 0.6 wt% or less. When the amount of adhesion is within this range, the hydrophilic property as a top sheet for sanitary materials is satisfied, and the processability is also good.
本実施形態の複合長繊維不織布はクッション性の柔らかさを有する嵩高性と高い強伸度を有するため、衛生材料の製造に好適に使用することができる。衛生材料としては、使い捨てオムツ、生理用ナプキン、失禁パットが挙げられ、表面のトップシート、外側のバックシートに好適に利用することができる。 Since the composite long-fiber nonwoven fabric of the present embodiment has bulkiness with cushioning softness and high strength and elongation, it can be suitably used for manufacturing hygienic materials. Examples of sanitary materials include disposable diapers, sanitary napkins, and incontinence pads, which can be suitably used for the top sheet on the surface and the back sheet on the outside.
また、本実施形態の複合長繊維不織布は、前記用途に限られず、例えば、マスク、カイロ、テープ基布、防水シート基布、貼布薬基布、救急絆基布、包装材、ワイプ製品、医療用ガウン、包帯、衣料、スキンケア用シートなどにも使用することができる。 Further, the composite long-fiber nonwoven fabric of the present embodiment is not limited to the above applications, for example, a mask, a body warmer, a tape base cloth, a waterproof sheet base cloth, a patch base cloth, a first aid base cloth, a packaging material, a wipe product, It can also be used in medical gowns, bandages, clothing, skin care sheets, etc.
以下、実施例及び比較例により本発明を具体的に説明するが、本発明は下記の実施例のみに限定されるものではない。なお、各特性の評価方法は下記のとおりであり、得られた物性を以下の表１に示す。本発明では、製造ライン方向で繊維の流れ方向をＭＤ方向、繊維の流れ方向と直角方向で巾方向をＣＤ方向という。 Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. The evaluation method of each characteristic is as follows, and the obtained physical properties are shown in Table 1 below. In the present invention, the fiber flow direction in the production line direction is called the MD direction, and the width direction perpendicular to the fiber flow direction is called the CD direction.
１．平均単糸繊度（ｄｔｅｘ）
１ｃｍ角の試験片をサンプリングし、キーエンス社製マイクロスコープＶＨＸ−７００Ｆで繊維の直径を各２０点ずつ測定し、その平均値から繊度を算出した。
1. Average single yarn fineness (dtex)
A 1 cm square test piece was sampled, the diameter of each fiber was measured at 20 points with a microscope VHX-700F manufactured by Keyence Corporation, and the fineness was calculated from the average value.
２．目付（ｇ／ｍ2）
ＪＩＳ−Ｌ１９０６に準じ、ＭＤ方向２０ｃｍ×ＣＤ方向５ｃｍの試験片を任意に５枚採取して質量を測定し、その平均値を単位面積あたりの重量に換算して求めた。
2. Basis weight (g/m 2 )
In accordance with JIS-L1906, five test pieces of 20 cm in the MD direction and 5 cm in the CD direction were arbitrarily sampled, the mass was measured, and the average value was converted to the weight per unit area.
３．通気度（ｃｍ３／ｃｍ２／ｓ）
ＪＩＳ Ｌ−１０９６に記載のフラジール法に準拠して測定した。約１５ｃｍ×約１５ｃｍの試験片を５点採取して測定し、測定値の平均値を算出した。
3. Air permeability (cm 3 /cm 2 /s)
It was measured according to the Frazier method described in JIS L-1096. Five test pieces of about 15 cm×about 15 cm were sampled and measured, and the average value of the measured values was calculated.
４．配向指数（Ｘ線ＣＴ）
ＭＤ方向５ｍｍ×ＣＤ方向５ｍｍの試験片を任意にカットし、画像解析時の視野約３ｍｍ×３ｍｍで測定した。測定装置は高分解能３ＤＸ線顕微鏡ｎａｎｏ３ＤＸ（株式会社リガク製）を用い、軽元素でもコントラストが得られる低エネルギー高輝度Ｘ線によるＣＴ測定で行った。詳細な条件を以下に示す。
Ｘ線ターゲット：Ｃｕ
Ｘ線管電圧：４０ｋＶ
Ｘ線管電流：３０ｍＡ
レンズ：１．０８μｍ／ｐｉｘ
ビニング：２
回転角度：１８０°
投影数：１０００枚
露光時間：１０秒／枚
カメラ画素数：３３００×２５００
再構成：Ｆｅｌｄｋａｍｐ法
ＣＴ測定により得られた３次元のトモグラムを画像解析し、直交する３軸（ｘ、ｙ、ｚ）の配向性指標Ｉｘ、Ｉｙ、Ｉｚを求めた。主に評価したいサンプルの厚み方向をｚ方向と一致させた。ここで、配向性指標Ｉｘ、Ｉｙ、Ｉｚとは、ｘ、ｙ、ｚの各方向から見た繊維表面の面積の和（各方向での繊維表面の延べ投影面積の和）をそれぞれＡｘ、Ａｙ、Ａｚとしたとき、
Ｉｘ＝Ａｘ／（Ａｘ＋Ａｙ＋Ａｚ）
Ｉｙ＝Ａｙ／（Ａｘ＋Ａｙ＋Ａｚ）
Ｉｚ＝Ａｚ／（Ａｘ＋Ａｙ＋Ａｚ）
で定義した。Ａｘ、Ａｙ、Ａｚはトモグラムから求めた。この指標においては、値の小さい方向に配向していることになる。また、等方的構造においてはすべて１／３となる。
4. Orientation index (X-ray CT)
A test piece of 5 mm in MD direction×5 mm in CD direction was arbitrarily cut, and measurement was performed in a visual field of about 3 mm×3 mm during image analysis. A high-resolution 3DX-ray microscope nano3DX (manufactured by Rigaku Co., Ltd.) was used as a measuring device, and CT measurement was performed by low-energy high-brightness X-rays that can obtain contrast even with light elements. The detailed conditions are shown below.
X-ray target: Cu
X-ray tube voltage: 40 kV
X-ray tube current: 30mA
Lens: 1.08 μm/pix
Binning: 2
Rotation angle: 180°
Number of projections: 1000 sheets Exposure time: 10 seconds/sheet Number of camera pixels: 3300 x 2500
Reconstruction: Feldkamp method A three-dimensional tomogram obtained by CT measurement was image-analyzed to determine orientation indices Ix, Iy, and Iz of three orthogonal axes (x, y, z). The thickness direction of the sample to be evaluated was mainly matched with the z direction. Here, the orientation indexes Ix, Iy, and Iz are the sums of the areas of the fiber surfaces viewed from the respective directions of x, y, and z (the sum of the total projected areas of the fiber surfaces in the respective directions), respectively. , Az,
Ix=Ax/(Ax+Ay+Az)
Iy=Ay/(Ax+Ay+Az)
Iz=Az/(Ax+Ay+Az)
Defined in. Ax, Ay, and Az were calculated from the tomogram. In this index, the orientation is in the direction of smaller value. Further, in the isotropic structure, it is 1/3 in all cases.
５．破断強度（Ｎ／５ｃｍ）、破断伸度（％）、タフネス指標
ＪＩＳ Ｌ−１９０６に準じ、ＣＤ方向均等になる様に、ＣＤ方向５ｃｍ、ＭＤ方向２０ｃｍの試料を５点切り取り、引張試験機で、つかみ間隔１０ｃｍ、引張速度３０ｃｍ／分で測定した。タテ方向各５点の試料を測定し、測定値を平均して破断強度と破断伸度を算出した。タフネス指標は以下の式から算出した。
タフネス指標＝破断強度（Ｎ／５ｃｍ）×破断伸度（％）／目付（ｇ／ｍ２）
5. Breaking strength (N/5 cm), breaking elongation (%), toughness index According to JIS L-1906, 5 points in a CD direction of 5 cm and a MD direction of 20 cm were cut out in a tensile tester so as to be uniform in the CD direction. The grip interval was 10 cm, and the pulling speed was 30 cm/min. Five samples each in the vertical direction were measured, and the measured values were averaged to calculate the breaking strength and the breaking elongation. The toughness index was calculated from the following formula.
Toughness index = breaking strength (N/5 cm) x breaking elongation (%) / basis weight (g/m 2 ).
６．嵩密度（ｇ／ｃｍ３）
ＭＤ、ＣＤ方向均等になる様にピーコック式厚み計（５ｇ／４ｃｍ２）で２０点測定し、平均の厚さを算出した。その平均値から以下の式を用い、嵩密度を算出した。
嵩密度（ｇ／ｃｍ３）＝目付（ｇ／ｍ２）／厚み（ｍｍ）／１０００
6. Bulk density (g/cm 3 )
20 points were measured with a peacock type thickness meter (5 g/4 cm 2 ) so as to be uniform in the MD and CD directions, and the average thickness was calculated. The bulk density was calculated from the average value using the following formula.
Bulk density (g/cm 3 )=Basis weight (g/m 2 )/Thickness (mm)/1000
７．捲縮数
ＣＤ方向に５点の５ｃｍ角の試験片をサンプリングし、キーエンス社製マイクロスコープＶＨ−Ｚ４５０にて繊維に荷重がかからない状態で２．５４ｃｍ（１インチ）当たりの捲縮数を測定し、その平均値から捲縮数を算出した。
7. Number of crimps Five 5 cm square test pieces were sampled in the CD direction, and the number of crimps per 2.54 cm (1 inch) was measured by a Keyence Microscope VH-Z450 with no load applied to the fibers. The number of crimps was calculated from the average value.
８．圧縮仕事量（ＷＣ）
ＣＤ方向に５点の５ｃｍ角の試験片を採取し、カトーテック社製圧縮試験装置（ＫＥＳ−Ｇ５）を用いて測定した。試験片を金属製試料台の上に設置し、加圧面積２ｃｍ２の円形平面を持つ鋼板間で圧縮した。圧縮速度は０．０６７ｍｍ／ｓで、圧縮最大荷重は３．４ｋＰａ（３５ｇｆ／ｃｍ２）とした。回復過程も同一速度で測定し、圧縮仕事量の平均値を算出した。
8. Compression work (WC)
Five 5 cm square test pieces were sampled in the CD direction and measured using a compression test device (KES-G5) manufactured by Kato Tech. The test piece was placed on a metal sample table and compressed between steel plates having a circular flat surface with a pressing area of 2 cm 2 . The compression speed was 0.067 mm/s, and the maximum compression load was 3.4 kPa (35 gf/cm 2 ). The recovery process was also measured at the same speed, and the average value of the compression work was calculated.
〔実施例１〕
ＭＦＲが５５ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度２３０℃、荷重２．１６ｋｇで測定）のポリプロピレン（ＰＰ）樹脂を第１成分とし、ＭＩが２６ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度１９０℃、荷重２．１６ｋｇで測定）の高密度ポリエチレン（ＨＤＰＥ）樹脂を第２成分とし、第１成分の吐出量が０．４ｇ／分・Ｈｏｌｅ、第２成分の吐出量が０．４ｇ／分・Ｈｏｌｅで全単孔吐出量が０．８ｇ／分・Ｈｏｌｅであり、第１成分と第２成分の比が５０／５０となる繊維をスパンボンド法により紡糸温度２２０℃で押出し、このフィラメント群を牽引して紡速３，０００ｍ／分で、移動捕集面に向けて押し出し、平均単糸繊度２．８ｄｔｅｘのサイドバイサイド型長繊維不織ウェブを調整した。
次いで、得られた不織ウェブを熱風温度１４２℃、熱風風速０．７ｍ／ｓの熱風により繊維同士を接着し、目付２０ｇ／ｍ２で通気度４２０ｃｍ３／ｃｍ２／ｓ、捲縮数１６個／インチの複合長繊維不織布を得た。
[Example 1]
A polypropylene (PP) resin having an MFR of 55 g/10 min (measured according to JIS-K7210 at a temperature of 230° C. and a load of 2.16 kg) is used as a first component, and an MI of 26 g/10 min (according to JIS-K7210, temperature High density polyethylene (HDPE) resin of 190° C., load 2.16 kg) is used as the second component, the discharge amount of the first component is 0.4 g/min·Hole, and the discharge amount of the second component is 0.4 g/ The total single hole discharge rate is 0.8 g/min/Hole in min.-Hole, and the ratio of the first component to the second component is 50/50. The fiber is extruded at a spinning temperature of 220.degree. The group was pulled and extruded toward the moving collection surface at a spinning speed of 3,000 m/min to prepare a side-by-side type continuous fiber non-woven web having an average single yarn fineness of 2.8 dtex.
Next, the obtained nonwoven web was bonded to the fibers with hot air having a hot air temperature of 142° C. and a hot air velocity of 0.7 m/s, and the fabric weight was 20 g/m 2 and the air permeability was 420 cm 3 /cm 2 /s and the crimping number was 16 A piece/inch of composite long-fiber nonwoven fabric was obtained.
〔実施例２〕
熱風温度１５０℃、熱風風速０．９ｍ／ｓの熱風により繊維同士を接着し、実施例１と同様にして平均単糸繊度３．５ｄｔｅｘ、目付２０ｇ／ｍ２で通気度４２５ｃｍ３／ｃｍ２／ｓ、捲縮数２５個／インチの複合長繊維不織布を得た。
[Example 2]
The fibers were adhered to each other by hot air having a hot air temperature of 150° C. and a hot air velocity of 0.9 m/s, and in the same manner as in Example 1, the average single yarn fineness was 3.5 dtex, the basis weight was 20 g/m 2 , and the air permeability was 425 cm 3 /cm 2 /. A composite long-fiber nonwoven fabric having s and a crimp number of 25/inch was obtained.
〔実施例３〕
第１成分と第２成分の比を６７／３３とし、熱風温度１３８℃、熱風風速０．５ｍ／ｓの熱風により繊維同士を接着し、実施例１と同様にして平均単糸繊度３．５ｄｔｅｘ、目付１８ｇ／ｍ２で通気度５３７ｃｍ３／ｃｍ２／ｓ、捲縮数４０個／インチの複合長繊維不織布を得た。
[Example 3]
The ratio of the first component to the second component was 67/33, the fibers were bonded together by hot air having a hot air temperature of 138° C. and a hot air velocity of 0.5 m/s, and the average single yarn fineness was 3.5 dtex in the same manner as in Example 1. A composite long-fiber nonwoven fabric having a basis weight of 18 g/m 2 and an air permeability of 537 cm 3 /cm 2 /s and a crimp number of 40/inch was obtained.
〔実施例４〕
第２成分をＭＩが１６．８ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度１９０℃、荷重２．１６ｋｇで測定）の直鎖状低密度ポリエチレン（ＬＬＤＰＥ）樹脂とし、熱風温度１３５℃、熱風風速１．０ｍ／ｓの熱風により繊維同士を接着し、実施例１と同様にして平均単糸繊度６．０ｄｔｅｘ、目付２０ｇ／ｍ２で通気度６２５ｃｍ３／ｃｍ２／ｓ、捲縮数１５個／インチの複合長繊維不織布を得た。
次いで、得られた不織布を、室温２２℃の雰囲気下にて放電量４０Ｗ・ｍｉｎ／ｍ２（放電度４．０Ｗ／ｃｍ２）の条件でコロナ放電処理機に通し、濡れ張力３９ｍＮ／ｍの不織布を得た。得られた不織布にポリエーテル系の親水化剤を噴霧法により付与し、次いで１１０℃で３０秒間熱風乾燥し、剤濃度付着量が０．３重量％となる長繊維不織布を得た。得られた不織布はオムツのトップシートとして満足できる性能であった。
[Example 4]
The second component is a linear low-density polyethylene (LLDPE) resin having an MI of 16.8 g/10 min (measured at a temperature of 190° C. and a load of 2.16 kg according to JIS-K7210), hot air temperature of 135° C., hot air velocity. The fibers were bonded together by hot air of 1.0 m/s, and the average single yarn fineness was 6.0 dtex, the basis weight was 20 g/m 2 , the air permeability was 625 cm 3 /cm 2 /s, and the number of crimps was 15 as in Example 1. A composite long-fiber non-woven fabric of 1/inch was obtained.
Next, the obtained non-woven fabric was passed through a corona discharge treatment machine under the conditions of a discharge amount of 40 W·min/m 2 (discharge degree of 4.0 W/cm 2 ) in an atmosphere of room temperature of 22° C., and a wetting tension of 39 mN/m was applied. A non-woven fabric was obtained. A polyether hydrophilizing agent was applied to the obtained non-woven fabric by a spraying method, and then dried with hot air at 110° C. for 30 seconds to obtain a long-fiber non-woven fabric having an agent concentration adhesion amount of 0.3% by weight. The resulting nonwoven fabric had satisfactory performance as a diaper topsheet.
〔実施例５〕
繊維形状を偏芯型とし、実施例１と同様にして平均単糸繊度２．０ｄｔｅｘの長繊維不織ウェブを調整した。
次いで、得られた不織ウェブを、１００℃のフラットロールとエンボスロール（パターン仕様：直径０．４２５ｍｍ円形、千鳥配列、横ピッチ２．１ｍｍ、縦ピッチ１．１ｍｍ、深さ０．８ｍｍ、圧着面積率６．３％）の間に通して繊維同士を仮接着し、次いで、熱風温度１４２℃、熱風風速０．７ｍ／ｓの熱風により繊維同士を接着し、目付２０ｇ／ｍ２で通気度４４５ｃｍ３／ｃｍ２／ｓ、捲縮数２１個／インチの複合長繊維不織布を得た。
[Example 5]
An eccentric type fiber was used, and a long fiber nonwoven web having an average single yarn fineness of 2.0 dtex was prepared in the same manner as in Example 1.
Then, the obtained nonwoven web is flat-rolled and embossed at 100° C. (pattern specifications: diameter 0.425 mm circle, zigzag arrangement, horizontal pitch 2.1 mm, vertical pitch 1.1 mm, depth 0.8 mm, pressure bonding) The fibers are temporarily adhered to each other by passing between them with an area ratio of 6.3%), and then the fibers are adhered to each other by hot air having a hot air temperature of 142° C. and a hot air velocity of 0.7 m/s, and the air permeability is 20 g/m 2 per unit area. A composite long-fiber nonwoven fabric having a crimp number of 21 pieces/inch and 445 cm 3 /cm 2 /s was obtained.
〔実施例６〕
平均単糸繊度を０．９ｄｔｅｘで調整し、得られた不織ウェブを、１００℃のフラットロールとエンボスロール（パターン仕様：直径１．０ｍｍ円形、千鳥配列、横ピッチ４．４ｍｍ、縦ピッチ４．４ｍｍ、深さ１．５ｍｍ、圧着面積率８．０％）の間に通して繊維同士を仮接着した以外は実施例５と同様にして目付２０ｇ／ｍ２で通気度３５０ｃｍ３／ｃｍ２／ｓ、捲縮数２５個／インチの複合長繊維不織布を得た。
[Example 6]
The average single yarn fineness was adjusted to 0.9 dtex, and the obtained nonwoven web was flat roll and emboss roll at 100° C. (pattern specifications: diameter 1.0 mm circle, staggered arrangement, horizontal pitch 4.4 mm, vertical pitch 4). Air permeability of 350 cm 3 /cm 2 with a basis weight of 20 g/m 2 in the same manner as in Example 5 except that the fibers were temporarily bonded together by passing between 0.4 mm, a depth of 1.5 mm, and a pressure bonding area ratio of 8.0%). A composite long-fiber nonwoven fabric having a crimp/s and a crimp number of 25/inch was obtained.
〔実施例７〕
第１成分と第２成分の比を８０／２０とし、熱風温度１４５℃、熱風風速０．７ｍ／ｓの熱風により繊維同士を接着し、実施例５と同様にして平均単糸繊度２．５ｄｔｅｘ、目付２５ｇ／ｍ２で通気度３５８ｃｍ３／ｃｍ２／ｓ、捲縮数２６個／インチの複合長繊維不織布を得た。
[Example 7]
The ratio of the first component to the second component is 80/20, the fibers are bonded together by hot air having a hot air temperature of 145° C. and a hot air velocity of 0.7 m/s, and the average single yarn fineness is 2.5 dtex in the same manner as in Example 5. A composite long-fiber nonwoven fabric having a basis weight of 25 g/m 2 and an air permeability of 358 cm 3 /cm 2 /s and a crimping number of 26 pieces/inch was obtained.
〔実施例８〕
第２成分をＭＩが１６．８ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度１９０℃、荷重２．１６ｋｇで測定）の直鎖状低密度ポリエチレン（ＬＬＤＰＥ）樹脂とし、熱風温度１５０℃、熱風風速０．３ｍ／ｓの熱風により繊維同士を接着し、実施例６と同様にして平均単糸繊度３．０ｄｔｅｘ、目付１７ｇ／ｍ２で通気度５８７ｃｍ３／ｃｍ２／ｓ、捲縮数３８個／インチの複合長繊維不織布を得た。
次いで、得られた不織布にポリエーテル系の親水化剤を噴霧法により付与し、次いで１１０℃で３０秒間熱風乾燥し、剤濃度付着量が０．５重量％となる長繊維不織布を得た。得られた不織布はオムツのトップシートとして満足できる性能であった。
[Example 8]
The second component is a linear low-density polyethylene (LLDPE) resin having MI of 16.8 g/10 min (measured at a temperature of 190° C. and a load of 2.16 kg according to JIS-K7210), hot air temperature of 150° C., hot air velocity. The fibers were bonded together by hot air of 0.3 m/s, and the average single yarn fineness was 3.0 dtex, the basis weight was 17 g/m 2 , the air permeability was 587 cm 3 /cm 2 /s, and the number of crimps was 38 in the same manner as in Example 6. A composite long-fiber non-woven fabric of 1/inch was obtained.
Then, a polyether hydrophilizing agent was applied to the obtained non-woven fabric by a spraying method, and then dried with hot air at 110° C. for 30 seconds to obtain a long-fiber non-woven fabric having an agent concentration adhesion amount of 0.5% by weight. The resulting nonwoven fabric had satisfactory performance as a diaper topsheet.
〔実施例９〕
ＭＦＲが５５ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度２３０℃、荷重２．１６ｋｇで測定）のポリプロピレン（ＰＰ）樹脂にＭＩが２６ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度１９０℃、荷重２．１６ｋｇで測定）の高密度ポリエチレン（ＨＤＰＥ）樹脂を３重量％添加した樹脂を第１成分とし、熱風温度１４０℃、熱風風速０．８ｍ／ｓの熱風により繊維同士を接着し、実施例５と同様にして平均単糸繊度２．８ｄｔｅｘ、目付２０ｇ／ｍ２で通気度４４１ｃｍ３／ｃｍ２／ｓ、捲縮数１２個／インチの複合長繊維不織布を得た。
[Example 9]
A polypropylene (PP) resin having an MFR of 55 g/10 min (measured according to JIS-K7210 at a temperature of 230° C. and a load of 2.16 kg) has an MI of 26 g/10 min (according to JIS-K7210, a temperature of 190° C., a load of 2). 0.1% (measured at 16 kg) and 3% by weight of a high density polyethylene (HDPE) resin as the first component, and the fibers were bonded together by hot air having a hot air temperature of 140° C. and a hot air velocity of 0.8 m/s. In the same manner as above, a composite long-fiber nonwoven fabric having an average single yarn fineness of 2.8 dtex, a basis weight of 20 g/m 2 and an air permeability of 441 cm 3 /cm 2 /s and a crimp number of 12 pieces/inch was obtained.
〔実施例１０〕
ＭＩが２６ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度１９０℃、荷重２．１６ｋｇで測定）の高密度ポリエチレン（ＨＤＰＥ）樹脂にＭＦＲが５５ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度２３０℃、荷重２．１６ｋｇで測定）のポリプロピレン（ＰＰ）樹脂を３重量％添加した樹脂を第２成分とし、熱風温度１４０℃、熱風風速０．８ｍ／ｓの熱風により繊維同士を接着し、実施例５と同様にして平均単糸繊度２．８ｄｔｅｘ、目付２０ｇ／ｍ２で通気度４４５ｃｍ３／ｃｍ２／ｓ、捲縮数１８個／インチの複合長繊維不織布を得た。
[Example 10]
High density polyethylene (HDPE) resin having MI of 26 g/10 min (measured at a temperature of 190° C. and a load of 2.16 kg according to JIS-K7210) has an MFR of 55 g/10 min (at 230° C. according to JIS-K7210). A resin obtained by adding 3% by weight of polypropylene (PP) resin (measured under a load of 2.16 kg) was used as the second component, and the fibers were bonded together by hot air having a hot air temperature of 140° C. and a hot air velocity of 0.8 m/s. In the same manner as above, a composite long-fiber nonwoven fabric having an average single yarn fineness of 2.8 dtex, a basis weight of 20 g/m 2 and an air permeability of 445 cm 3 /cm 2 /s and a crimp number of 18/inch was obtained.
〔実施例１１〕
第１成分を溶液粘度ηｓｐ／ｃ ０．７５のポリエチレンテレフタレート（ＰＥＴ）とし、ＭＩが２６ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度１９０℃、荷重２．１６ｋｇで測定）の高密度ポリエチレン（ＨＤＰＥ）樹脂を第２成分とし、実施例５と同様にして、スパンボンド法により紡糸温度２９５℃で押出し、このフィラメント群を牽引して紡速３，０００ｍ／分で、移動捕集面に向けて押し出し、平均単糸繊度２．３ｄｔｅｘの偏芯型長繊維不織ウェブを調整した。
次いで、得られた不織ウェブを、１００℃のフラットロールとエンボスロール（パターン仕様：直径０．４２５ｍｍ円形、千鳥配列、横ピッチ２．１ｍｍ、縦ピッチ１．１ｍｍ、深さ０．８ｍｍ、圧着面積率６．３％）の間に通して繊維同士を仮接着し、次いで、熱風温度１４５℃、熱風風速１．０ｍ／ｓの熱風により繊維同士を接着し、目付２０ｇ／ｍ２で通気度３９０ｃｍ３／ｃｍ２／ｓ、捲縮数２０個／インチの複合長繊維不織布を得た。
[Example 11]
The first component is polyethylene terephthalate (PET) having a solution viscosity ηsp/c 0.75, and a high density polyethylene (HDPE) having an MI of 26 g/10 min (measured at a temperature of 190° C. and a load of 2.16 kg according to JIS-K7210). ) A resin was used as the second component and extruded by the spunbond method at a spinning temperature of 295° C. in the same manner as in Example 5, and the filament group was pulled to a moving collecting surface at a spinning speed of 3,000 m/min. An eccentric long-fiber nonwoven web having an average single yarn fineness of 2.3 dtex was prepared by extrusion.
Then, the obtained nonwoven web is flat-rolled and embossed at 100° C. (pattern specifications: diameter 0.425 mm circle, zigzag arrangement, horizontal pitch 2.1 mm, vertical pitch 1.1 mm, depth 0.8 mm, pressure bonding) The fibers are temporarily adhered to each other by passing between them with an area ratio of 6.3%), and then the fibers are adhered to each other by hot air having a hot air temperature of 145° C. and a hot air velocity of 1.0 m/s, and the air permeability is 20 g/m 2 per unit area. A composite long-fiber nonwoven fabric having a crimp number of 20 pieces/inch was obtained at 390 cm 3 /cm 2 /s.
〔比較例１〕
熱風温度１２５℃、熱風風速０．７ｍ／ｓの熱風により繊維同士を接着し、実施例１と同様にして平均単糸繊度２．８ｄｔｅｘ、目付２０ｇ／ｍ２で通気度７１０ｃｍ３／ｃｍ２／ｓ、捲縮数２１個／インチの複合長繊維不織布を得た。得られた不織布は強度の低いものであった。
[Comparative Example 1]
The fibers were bonded together with hot air having a hot air temperature of 125° C. and a hot air velocity of 0.7 m/s, and in the same manner as in Example 1, the average single yarn fineness was 2.8 dtex, the basis weight was 20 g/m 2 , and the air permeability was 710 cm 3 /cm 2 /. A composite long-fiber nonwoven fabric with s and a crimp number of 21/inch was obtained. The resulting nonwoven fabric had low strength.
〔比較例２〕
熱風温度１５６℃、熱風風速２．０ｍ／ｓの熱風により繊維同士を接着し、実施例１と同様にして平均単糸繊度２．８ｄｔｅｘ、目付２０ｇ／ｍ２で通気度２８０ｃｍ３／ｃｍ２／ｓ、捲縮数２２個／インチの複合長繊維不織布を得た。不織布表面の繊維は一部溶融している箇所もあり、伸度が低いものであった。
[Comparative Example 2]
The fibers were bonded together with hot air having a hot air temperature of 156° C. and a hot air velocity of 2.0 m/s, and in the same manner as in Example 1, the average single yarn fineness was 2.8 dtex, the basis weight was 20 g/m 2 , and the air permeability was 280 cm 3 /cm 2 /. A composite long-fiber nonwoven fabric having s and 22 crimps/inch was obtained. Some of the fibers on the surface of the non-woven fabric were melted, and the elongation was low.
〔比較例３〕
繊維形状を偏芯型とし、第１成分と第２成分の比を２０／８０として、熱風温度１３５℃、熱風風速０．７ｍ／ｓの熱風により繊維同士を接着し、実施例１と同様にして平均単糸繊度２．８ｄｔｅｘ、目付２０ｇ／ｍ２で通気度４４４ｃｍ３／ｃｍ２／ｓ、捲縮数４個／インチの複合長繊維不織布を得た。得られた不織布は捲縮数が低く、強度の低いものであった。
[Comparative Example 3]
The fiber shape was eccentric, the ratio of the first component to the second component was 20/80, and the fibers were bonded together by hot air having a hot air temperature of 135° C. and a hot air velocity of 0.7 m/s, and the same as in Example 1. As a result, a composite long fiber nonwoven fabric having an average single yarn fineness of 2.8 dtex, a basis weight of 20 g/m 2 and an air permeability of 444 cm 3 /cm 2 /s and a crimping number of 4 pieces/inch was obtained. The obtained non-woven fabric had a low number of crimps and a low strength.
〔比較例４〕
繊維形状を等芯円の鞘芯型とし、熱風温度１４２℃、熱風風速０．８ｍ／ｓの熱風ボンディングにより繊維同士を接着し、実施例１と同様にして平均単糸繊度２．８ｄｔｅｘ、目付２０ｇ／ｍ２で通気度２９３ｃｍ３／ｃｍ２／ｓであり、繊維が捲縮していない複合長繊維不織布を得た。得られた不織布は嵩密度が高く、クッション性を有しておらず風合いの硬いものであった。
[Comparative Example 4]
The fiber shape is a concentric core-sheath type, the fibers are bonded together by hot air bonding at a hot air temperature of 142° C. and a hot air velocity of 0.8 m/s, and the average single yarn fineness is 2.8 dtex and the basis weight is the same as in Example 1. A composite long-fiber nonwoven fabric having an air permeability of 293 cm 3 /cm 2 /s at 20 g/m 2 and no fibers crimped was obtained. The obtained nonwoven fabric had a high bulk density, did not have cushioning properties, and had a hard texture.
〔比較例５〕
ＭＦＲが５５ｇ／１０分（ＪＩＳ−Ｋ７２１０に準じ、温度２３０℃、荷重２．１６ｋｇで測定）のポリプロピレン（ＰＰ）樹脂を単成分にてスパンボンド法により紡糸温度２２０℃で押出し、このフィラメント群を牽引して紡速３，０００ｍ／分で、移動捕集面に向けて押し出し、平均単糸繊度２．８ｄｔｅｘの長繊維不織ウェブを調製した。
次いで、得られた不織ウェブを、１４１℃のフラットロールとエンボスロール（パターン仕様：直径０．４２５ｍｍ円形、千鳥配列、横ピッチ２．１ｍｍ、縦ピッチ１．１ｍｍ、圧着面積率６．３％）の間に通して繊維同士を接着し、目付２０ｇ／ｍ２で通気度４５６ｃｍ３／ｃｍ２／ｓであり、繊維が捲縮していない長繊維不織布を得た。得られた不織布は嵩密度が高く、クッション性を有しておらず風合いの硬いものであった。
[Comparative Example 5]
A polypropylene (PP) resin having an MFR of 55 g/10 min (measured according to JIS-K7210 at a temperature of 230° C. and a load of 2.16 kg) is extruded at a spinning temperature of 220° C. by a spun bond method as a single component, and this filament group is formed. By pulling and extruding at a spinning speed of 3,000 m/min toward the moving collection surface, a long fiber nonwoven web having an average single yarn fineness of 2.8 dtex was prepared.
Then, the obtained non-woven web was subjected to a flat roll at 141° C. and an emboss roll (pattern specifications: diameter 0.425 mm circle, staggered arrangement, horizontal pitch 2.1 mm, vertical pitch 1.1 mm, crimping area ratio 6.3%). ), the fibers were adhered to each other to give a fiber having a basis weight of 20 g/m 2 and an air permeability of 456 cm 3 /cm 2 /s. The obtained nonwoven fabric had a high bulk density, did not have cushioning properties, and had a hard texture.
〔比較例６〕
第１成分となる芯の成分が融点１６２℃のポリプロピレン、第２成分となる鞘の成分が融点１３０℃の高密度ポリエチレンであって、繊度２．５ｄｔｅｘ、カット長３８ｍｍの短繊維を構成繊維とし、カード法によって不織ウェブを得た。
次いで、得られた不織ウェブを熱風温度１４０℃、熱風風速１．０ｍ／ｓの熱風ボンディングにより繊維同士を接着し、目付１８ｇ／ｍ２で通気度７１７ｃｍ３／ｃｍ２／ｓ、捲縮数５個／インチの複合短繊維不織布を得た。得られた不織布は伸度が低く、タフネス指標が低いものであった。
[Comparative Example 6]
The first core component is polypropylene having a melting point of 162° C., the second sheath component is high-density polyethylene having a melting point of 130° C., and the short fibers having a fineness of 2.5 dtex and a cut length of 38 mm are used as constituent fibers. A non-woven web was obtained by the card method.
Then, the obtained nonwoven web is bonded to the fibers by hot air bonding at a hot air temperature of 140° C. and a hot air speed of 1.0 m/s, and the fabric weight is 18 g/m 2 and the air permeability is 717 cm 3 /cm 2 /s, and the number of crimps. A composite short-fiber nonwoven fabric of 5 pieces/inch was obtained. The obtained non-woven fabric had a low elongation and a low toughness index.
本発明の不織布は、クッション性の柔らかさを有する嵩高性、高い強伸度、透水性を有するため、衛生材料のトップシート、バックシートに好適に使用することができる。 Since the nonwoven fabric of the present invention has cushioning softness and bulkiness, high strength and elongation, and water permeability, it can be suitably used for topsheets and backsheets of sanitary materials.
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| JP7146641B2 (en) * | 2016-10-13 | 2022-10-04 | 旭化成株式会社 | Textile processing agent and liquid-permeable nonwoven fabric containing the same |
| JP6865063B2 (en) * | 2017-03-02 | 2021-04-28 | 旭化成株式会社 | Bulky composite long fiber non-woven fabric with excellent barrier properties |
| JP7017886B2 (en) * | 2017-09-06 | 2022-02-09 | 花王株式会社 | Sheet for absorbent articles |
| JP2019085661A (en) * | 2017-11-02 | 2019-06-06 | 旭化成株式会社 | Conjugate filament nonwoven fabric |
| JP6965729B2 (en) * | 2017-12-21 | 2021-11-10 | 王子ホールディングス株式会社 | Absorbent article |
| JP2019157306A (en) * | 2018-03-14 | 2019-09-19 | 旭化成株式会社 | Bulky soft nonwoven fabric |
| JP6557440B1 (en) * | 2019-01-25 | 2019-08-07 | 三井化学株式会社 | Spunbond nonwoven fabric, production method of spunbond nonwoven fabric, emboss roll |
| TWI760850B (en) | 2019-09-20 | 2022-04-11 | 日商旭化成股份有限公司 | non-woven |
| WO2022155993A1 (en) * | 2021-01-19 | 2022-07-28 | 珠海高先手术用品科技有限公司 | Nonwoven surgical pad, nonwoven surgical pad sterilized package and use thereof |
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| JPS481471A (en) * | 1971-06-01 | 1973-01-10 | ||
| JPH02182963A (en) * | 1989-01-06 | 1990-07-17 | Asahi Chem Ind Co Ltd | Heat-shrinkable filament nonwoven sheet and production thereof |
| JP2849919B2 (en) * | 1989-04-06 | 1999-01-27 | チッソ株式会社 | Method for producing bulky nonwoven fabric |
| EP2559793B1 (en) * | 2010-04-16 | 2017-09-06 | Mitsui Chemicals, Inc. | Composite crimp fiber, and non-woven fabric comprising the fiber |
| ES2668095T3 (en) * | 2010-11-22 | 2018-05-16 | Kao Corporation | Bulky sheet and its production method |
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