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JP3662455B2 - Polypropylene nonwoven fabric and method for producing the same - Google Patents

Polypropylene nonwoven fabric and method for producing the same Download PDF

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Publication number
JP3662455B2
JP3662455B2 JP33179399A JP33179399A JP3662455B2 JP 3662455 B2 JP3662455 B2 JP 3662455B2 JP 33179399 A JP33179399 A JP 33179399A JP 33179399 A JP33179399 A JP 33179399A JP 3662455 B2 JP3662455 B2 JP 3662455B2
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Prior art keywords
continuous fiber
continuous
nonwoven fabric
nozzle
fineness
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JP33179399A
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Japanese (ja)
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JP2001146670A (en
Inventor
利夫 小林
悟 丹下
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Unicharm Corp
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Unicharm Corp
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Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to JP33179399A priority Critical patent/JP3662455B2/en
Priority to KR1020000068308A priority patent/KR20010060339A/en
Priority to CA002326263A priority patent/CA2326263C/en
Priority to TW089124695A priority patent/TW487756B/en
Priority to AU71739/00A priority patent/AU765499B2/en
Priority to DE60036994T priority patent/DE60036994T2/en
Priority to EP00310313A priority patent/EP1101854B1/en
Priority to IDP20001009D priority patent/ID28425A/en
Priority to SG200006800A priority patent/SG87192A1/en
Priority to BRPI0005847-5A priority patent/BR0005847B1/en
Priority to CNB001309528A priority patent/CN1237218C/en
Publication of JP2001146670A publication Critical patent/JP2001146670A/en
Publication of JP3662455B2 publication Critical patent/JP3662455B2/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D01F6/06—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins from polypropylene
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nonwoven Fabrics (AREA)
  • Artificial Filaments (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、ポリプロピレンの連続繊維からなる不織布とその製造方法に関する。
【０００２】
【従来の技術】
特許公報第２８８７６１１号には、繊度が１ｄ以下の極細の連続繊維からなる不織布の製造方法が開示されている。この方法によれば、連続繊維は溶融紡糸工程で一度延伸され、その後に再度延伸されることによって繊度が所要の値になる。繊度が小さくなった連続繊維は捕集され、接着等によって結合して不織布となる。
【０００３】
【発明が解決しようとする課題】
前記公知技術によれば、連続繊維の繊度が小さくて肌触りの柔軟な不織布が得られる。この発明は、そのような不織布に高い破断伸度を付与することを課題にしている。
【０００４】
【課題を解決するための手段】
前記課題解決のためのこの発明は、物の発明に係る第１発明と、その物の製造方法に係る第２発明とで構成されている。
【０００５】
前記第１発明が対象とするのは、ポリプロピレンの連続繊維からなる不織布である。
【０００６】
かかる不織布において、第１発明が特徴とするところは、前記連続繊維が、０．００６〜５．８ｄの繊度と、０．０１９〜０．０３０の複屈折率と、１〜３ｇ／ｄの引張強度と、１００〜３００％の引張破断伸度とを有し、前記繊維どうしが、実質的に互いの機械的な交絡によって不織布形態を維持していること、にある。
【０００７】
【０００８】
前記第２発明が対象とするのは、多数のノズルから押出されるポリプロピレンの連続繊維を延伸した後、一方向へ走行するベルトに堆積させ、前記連続繊維どうしを互いに交絡させて第１発明の不織布を製造する方法である。
【０００９】
かかる方法において、第２発明が特徴とするところは、前記ノズルの近傍を溶融状態で押出されている前記連続繊維の温度付近となるように保温し、入口と出口とこれら両者間に延びる案内通路とを備え、前記案内通路には前記入口から出口へ向かう方向へ常温の圧縮エアーが吹出しているサッカーの前記案内通路へ前記連続繊維を導いて急冷し、前記ノズルと前記サッカーとの間において前記連続繊維を延伸して前記連続繊維の繊度を小さくし、かつ、前記ポリプロピレンの分子を所要の複屈折率が得られる程度にまで配向させること、にある。
【００１０】
第２発明には、以下のような好ましい実施態様がある。
（１）前記連続繊維が、前記ノズル近傍においては溶融温度にあって繊度が小さくなり、前記近傍から前記サッカーの入口に至るまでの間において前記連続繊維が融点近くの温度にまで徐々に降下し、前記サッカー内部において常温にまで急冷されつつ所要の複屈折率が得られる程度にまで延伸される態様。
（２）前記保温は、押出されている前記連続繊維とほぼ同じ温度の熱風が前記ノズルの近傍に吹出すことによってなされている態様。
（３）前記サッカー内部において、前記連続繊維の繊度が０．００６〜５．８ｄとなるように前記連続繊維を延伸する態様。
（４）前記サッカー内部において、前記連続繊維が複屈折率０．０１９〜０．０３０となるように前記ポリプロピレン分子を配向させる態様。
（５）高圧水の噴射によって前記連続繊維どうしを交絡させる工程が含まれる態様。
（６）前記ノズルから前記ベルトまでの距離が４００〜６００ｍｍである態様。
【００１１】
【発明の実施の態様】
添付の図面を参照し、この発明に係る不織布および不織布の製造方法の詳細を説明すると、以下のとおりである。
【００１２】
図１は、不織布１００を連続的に製造するための工程を示す図面であって、この工程には、溶融紡糸機１、サッカー２、無端ベルト３、高圧水噴射装置４、巻取り装置６が含まれている。
【００１３】
溶融紡糸機１は、図示されていないが原料投入口とスクリュー式押出機とを備え、押出機の先端に紡糸ノズル１１を有し、ノズル１１の両側近傍に熱風吹出口１２を有する。原料には、ポリプロピレン、例えばＭＦＲが１０〜８０ｇ／１０ｍｉｎのポリプロピレンが使用される。ノズル１１は、例えば孔径０．３５ｍｍのものが、図の紙面に垂直な方向へ孔間隔１ｍｍで一列に６００個並べられる。このノズル１１からは、ポリプロピレンの連続繊維１５が０．１３〜０．４０ｇ／ｍｉｎ／ノズルの割合で吐出される。吹出口１２からは、溶融したポリプロピレンの温度とほぼ同じ温度、例えば約２３０℃のポリプロピレンに対して約２３０℃の熱風が１〜３Ｎｍ３／ｍｉｎの割合で吹出し、押出されたポリプロピレンの急激な温度低下を防いでいる。
【００１４】
サッカー２は、連続繊維１５が通過する案内路１６と、案内孔１６にその両側で開口している常温圧縮エアーの吹出口１７とを有する。案内孔１６は連続繊維１５に対する入口１８と出口１９とを有し、入口１８の近傍には吹出口１７が設けられている。サッカー２の入口１８とノズル１１との距離Ｐは最大で５００ｍｍ、好ましくは１００〜３００ｍｍとなるように、サッカー２の位置が定められる。かかる距離Ｐを進む連続繊維１５の温度は、入口１８に達したときに融点近傍にまで降下していることが好ましい。吹出口１７から出口１９までの距離Ｑの間では、常温圧縮エアーが出口１９へ向かって吹出している。距離Ｑは２０〜５００ｍｍであることが好ましく、ここでいう常温とは１０〜５０℃の範囲を意味する。圧縮エアーは、圧力０．５〜２ｋｇｆ／ｃｍ２Ｇ、流量４〜１０Ｎｍ３／ｍｉｎの割合で供給される。案内孔１６へ進入した連続繊維１５は、常温圧縮エアーによって常温近傍にまで急冷されるとともに、繊度が０．００６〜５．８ｄ、複屈折率Δｎが０．０１９〜０．０３０となるように延伸される。延伸後の連続繊維１５は、１〜３ｇ／ｄの引張強度を有していることが好ましい。
【００１５】
無端ベルト３は、図の紙面に垂直な方向へ延びる幅を有し、サッカー２の出口１９からの距離Ｒが５０〜３００ｍｍである。好ましいベルト３では、ノズル１１からの距離が好ましくは３００〜１５００、より好ましくは４００〜６００ｍｍとなるように、距離Ｐ，Ｑ，Ｒが調整されている。ベルト３は、図の右方へ２〜８ｍ／ｍｉｎの速度で走行している。ベルト３は通気性のもので、このベルト３を挟んでサクションボックス２１がサッカー２と向かい合っている。出口１９から出た連続繊維１５は、圧縮エアーとサクションとの作用によってベルト３の幅方向や長さ方向へ揺れ動き、ベルト３の上に不規則な模様を画きながら堆積してウエブ２２を形成する。
【００１６】
高圧水噴射装置４は、多数のノズル２３がベルト３の幅方向へ０．３〜３ｍｍのピッチで並ぶことによって形成された１または２以上のノズル列２４と、ベルト３を挟んでノズル列２４と向かい合うサクションボックス２６とを有する。ノズル列２４が２列である場合、例えば１列目のノズル２３では、２０ｋｇｆ／ｃｍ２の噴射水流によってウエブ２２の地合を安定させるための処理を施し、２列目のノズル２３では１００ｋｇｆ／ｃｍ２の噴射水流によって連続繊維１５のうちの一部のものをウエブ２２の進行方向へ延びるように配列したり、また一部のものを互いに絡み合わせることによってウエブ２２の引張強度を向上させたりする。しかる後に、ウエブ２２は乾燥工程（図示せず）を経て不織布２６となり、巻取り装置６によってロール状に巻き取られる。
【００１７】
かかる一連の工程において、下記の運転条件を採用して得られた連続繊維１５と不織布２６との物性は、以下のとおりであった。
（運転条件）
使用樹脂 ポリプロピレン（ＭＦＲ＝７０ｇ／１０ｍｉｎ）
紡糸ノズル 孔径 ０．３５ｍｍ
孔数 ６００
孔のピッチ １ｍｍ
温度 ２３０℃
吐出量 ０．１３ｇ／ｍｉｎ／ノズル
熱風 温度 ２３０℃
流量 １．５Ｎｍ３／ｍｉｎ
常温圧縮エアー 圧力 １．０ｋｇｆ／ｃｍ２Ｇ
流量 ６．０Ｎｍ３／ｍｉｎ
ベルト 紡糸ノズルからの距離 ４９０ｍｍ
走行速度 ４．４ｍ／ｍｉｎ
高圧水噴射処理 第１列 ２０ｋｇｆ／ｃｍ２
第２列 １００ｋｇｆ／ｃｍ２
（連続繊維の物性）
平均繊維径 ８．９μｍ（０．５１ｄ）
繊維径標準偏差 １．０３
引張強度 １．７２ｇ／ｄ
引張破断伸度 ６．３８ｍｍ
引張条件： チャック間距離 ０ｍｍ
引張速度 １０ｍｍ／ｍｉｎ
複屈折率（Δｎ） ０．０２７
（不織布の物性）
坪量 ３４．２ｇ／ｍ２
厚さ（測定荷重 ３ｇ／ｃｍ２） ０．４８ｍｍ
ＭＤ方向の
引張強度 １６５５０ｇ／５０ｍｍ幅
引張破断伸度 １９３％
ＣＤ方向の
引張強度 ８２４８ｇ／５０ｍｍ幅
引張破断伸度 １９７％
引張条件： チャック間距離 １０ｍｍ
引張速度 １０ｍｍ／ｍｉｎ
【００１８】
これら連続繊維と不織布との物性からも明らかなように、この発明に係る製造方法で得られる連続繊維１５は繊度を比較的小さく、例えば、０．００６〜５．８ｄにすることができ、同時に繊度のばらつきを小さくすることができる。かかる連続繊維１５は、不織布２６となるまでの過程で殆ど熱融着することがなく、機械的に絡み合うだけであり、しかも、連続繊維であることによってその絡み合いの程度が弱く、連続繊維１５どうしは互いの動きをあまり拘束することがない。そのような連続繊維１５からなる不織布２６は、柔軟で、しかも、肌触りがよい。また、複屈折率Δｎが０．０１９〜０．０３０となるように延伸されている連続繊維１５は、その伸長性が著しく妨げられるほどにはポリプロピレン分子が高度に配向しておらず、高い破断伸度を有する。例えば、実施例の連続繊維１５は、チャック間距離が０ｍｍであるときの引張試験で６．３８ｍｍにまで伸びる。かかる連続繊維１５が高圧水の噴射で互いに機械的に絡み合うことによって形成された不織布２６は、連続繊維１５の破断伸度が高いことと、繊維１５どうしの絡み合いが弱いこととによって、ＭＤ方向とＣＤ方向とに１００〜３００％の高い破断伸度を有する。実施例の不織布２６では、ＭＤ方向とＣＤ方向との破断伸度が１９３％と１９７％とである。
【００１９】
この発明によって得られる不織布２６は、使い捨ておむつや生理用ナプキン、医療用の使い捨てガウン等の使い捨て着用物品に使用できる他に、フィルターやウエットワイプス等としても使用できる。
【００２０】
【発明の効果】
この発明に係るポリプロピレン製不織布の製造方法によれば、０．００６〜５．８ｄの繊度と、０．０１９〜０．０３０の複屈折率と、１〜３ｇ／ｄの引張強度とを有するポリプロピレンの連続繊維から不織布を得ることができ、この不織布では、連続繊維の紡糸時におけるポリプロピレン分子の配向度合いが低く、しかも連続繊維は互いの動きを強く拘束するほどには交絡していない。かかる不織布は、柔軟で肌触りがよく、しかも高い破断伸度を有している。
【図面の簡単な説明】
【図１】 不織布の製造工程図。
【符号の説明】
１ 押出機
２ サッカー
３ ベルト
４ 高圧水噴射装置
１１ ノズル
１５ 連続繊維
１６ 案内通路
１８ 入口
１９ 出口
２６ 不織布[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nonwoven fabric made of continuous polypropylene fibers and a method for producing the same.
[0002]
[Prior art]
Japanese Patent No. 2887611 discloses a method for producing a non-woven fabric composed of very fine continuous fibers having a fineness of 1d or less. According to this method, the continuous fiber is drawn once in the melt spinning step, and then drawn again, so that the fineness becomes a required value. The continuous fibers having a reduced fineness are collected and bonded by bonding or the like to form a nonwoven fabric.
[0003]
[Problems to be solved by the invention]
According to the known technique, a non-woven fabric that has a fineness of continuous fibers and is soft to the touch can be obtained. This invention makes it a subject to provide high breaking elongation to such a nonwoven fabric.
[0004]
[Means for Solving the Problems]
The present invention for solving the above problems is composed of a first invention according to a product invention and a second invention according to a method for manufacturing the product.
[0005]
The subject of the first invention is a nonwoven fabric made of continuous polypropylene fibers.
[0006]
In such a nonwoven fabric, the first invention is characterized in that the continuous fiber has a fineness of 0.006 to 5.8 d, a birefringence of 0.019 to 0.030, and a tension of 1 to 3 g / d. It has a strength and a tensile elongation at break of 100 to 300%, and the fibers maintain a non-woven fabric form by mechanical entanglement with each other.
[0007]
[0008]
The object of the second invention is that the continuous fibers of polypropylene extruded from a number of nozzles are stretched and then deposited on a belt traveling in one direction, and the continuous fibers are entangled with each other . This is a method for producing a nonwoven fabric.
[0009]
In this method, the second invention is characterized in that the vicinity of the nozzle is kept at a temperature close to the temperature of the continuous fiber extruded in a molten state, and the guide passage extends between the inlet and the outlet and both. And the guide passage is rapidly cooled by guiding the continuous fiber to the guide passage of the football where normal temperature compressed air is blowing in the direction from the inlet to the outlet, and between the nozzle and the football. The continuous fiber is drawn to reduce the fineness of the continuous fiber, and the polypropylene molecules are oriented to such an extent that a required birefringence is obtained.
[0010]
The second invention has the following preferred embodiments.
(1) The continuous fiber is at a melting temperature in the vicinity of the nozzle and the fineness is small, and the continuous fiber gradually falls to a temperature near the melting point between the vicinity and the entrance of the football. A mode in which the film is stretched to such an extent that a required birefringence is obtained while being rapidly cooled to room temperature inside the football.
(2) The said heat retention is made | formed by the hot air of the substantially the same temperature as the said continuous fiber being extruded blowing out to the vicinity of the said nozzle.
(3) A mode in which the continuous fibers are stretched so that the fineness of the continuous fibers is 0.006 to 5.8d inside the soccer.
(4) A mode in which the polypropylene molecules are oriented so that the continuous fiber has a birefringence of 0.019 to 0.030 inside the soccer.
(5) A mode in which a step of entanglement of the continuous fibers by high-pressure water injection is included.
(6) A mode in which the distance from the nozzle to the belt is 400 to 600 mm.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The details of the nonwoven fabric and the method for producing the nonwoven fabric according to the present invention will be described below with reference to the accompanying drawings.
[0012]
FIG. 1 is a drawing showing a process for continuously producing a nonwoven fabric 100. In this process, a melt spinning machine 1, a soccer 2, an endless belt 3, a high-pressure water injection device 4, and a winding device 6 are shown. include.
[0013]
Although not shown, the melt spinning machine 1 includes a raw material inlet and a screw type extruder, has a spinning nozzle 11 at the tip of the extruder, and has hot air outlets 12 near both sides of the nozzle 11. As the raw material, polypropylene, for example, polypropylene having an MFR of 10 to 80 g / 10 min is used. For example, 600 nozzles having a hole diameter of 0.35 mm are arranged in a line at a hole interval of 1 mm in a direction perpendicular to the drawing sheet. From this nozzle 11, polypropylene continuous fibers 15 are discharged at a rate of 0.13 to 0.40 g / min / nozzle. From the blowout port 12, approximately the same temperature as that of the melted polypropylene, for example, about 230 ° C. hot air is blown out at a rate of 1 to 3 Nm 3 / min with respect to the polypropylene at about 230 ° C. Prevents the decline.
[0014]
The soccer 2 has a guide path 16 through which the continuous fiber 15 passes, and a blowout port 17 of normal temperature compressed air that is open to the guide hole 16 on both sides thereof. The guide hole 16 has an inlet 18 and an outlet 19 for the continuous fiber 15, and an outlet 17 is provided in the vicinity of the inlet 18. The position of the soccer 2 is determined so that the distance P between the inlet 18 of the soccer 2 and the nozzle 11 is 500 mm at the maximum, preferably 100 to 300 mm. The temperature of the continuous fiber 15 traveling along the distance P is preferably lowered to the vicinity of the melting point when the temperature reaches the inlet 18. During the distance Q from the outlet 17 to the outlet 19, the room temperature compressed air is blown out toward the outlet 19. The distance Q is preferably 20 to 500 mm, and the normal temperature here means a range of 10 to 50 ° C. The compressed air is supplied at a pressure of 0.5 to 2 kgf / cm 2 G and a flow rate of 4 to 10 Nm 3 / min. The continuous fiber 15 that has entered the guide hole 16 is rapidly cooled to near room temperature by room temperature compressed air, and has a fineness of 0.006 to 5.8 d and a birefringence Δn of 0.019 to 0.030. Stretched. The continuous fiber 15 after drawing preferably has a tensile strength of 1 to 3 g / d.
[0015]
The endless belt 3 has a width extending in a direction perpendicular to the paper surface of the drawing, and a distance R from the outlet 19 of the soccer 2 is 50 to 300 mm. In the preferable belt 3, the distances P, Q, and R are adjusted so that the distance from the nozzle 11 is preferably 300 to 1500, more preferably 400 to 600 mm. The belt 3 runs to the right in the drawing at a speed of 2 to 8 m / min. The belt 3 is breathable, and the suction box 21 faces the soccer 2 with the belt 3 interposed therebetween. The continuous fibers 15 exiting from the outlet 19 are swung in the width direction and length direction of the belt 3 by the action of compressed air and suction, and are deposited on the belt 3 while drawing an irregular pattern to form a web 22. .
[0016]
The high-pressure water injection device 4 includes one or more nozzle rows 24 formed by arranging a large number of nozzles 23 at a pitch of 0.3 to 3 mm in the width direction of the belt 3, and the nozzle rows 24 across the belt 3. And a suction box 26 facing each other. When the nozzle row 24 has two rows, for example, the nozzle 23 in the first row performs a process for stabilizing the formation of the web 22 by the jet water flow of 20 kgf / cm 2 , and the nozzle 23 in the second row has 100 kgf / Some of the continuous fibers 15 are arranged so as to extend in the traveling direction of the web 22 by a jet water flow of cm 2 , or the tensile strength of the web 22 is improved by entanglement of some of the continuous fibers 15 with each other. To do. Thereafter, the web 22 becomes a non-woven fabric 26 through a drying process (not shown), and is wound into a roll by the winding device 6.
[0017]
In the series of steps, the physical properties of the continuous fiber 15 and the nonwoven fabric 26 obtained by employing the following operating conditions were as follows.
(Operating conditions)
Resin Polypropylene (MFR = 70g / 10min)
Spinning nozzle hole diameter 0.35mm
Number of holes 600
Hole pitch 1mm
230 ° C
Discharge rate 0.13 g / min / nozzle Hot air temperature 230 ° C
Flow rate 1.5Nm 3 / min
Normal temperature compressed air pressure 1.0kgf / cm 2 G
Flow rate 6.0Nm 3 / min
Distance from belt spinning nozzle 490mm
Traveling speed 4.4m / min
High pressure water injection treatment 1st row 20kgf / cm 2
Second row 100 kgf / cm 2
(Physical properties of continuous fibers)
Average fiber diameter 8.9μm (0.51d)
Fiber diameter standard deviation 1.03
Tensile strength 1.72 g / d
Tensile elongation at break 6.38mm
Tensile condition: Chuck distance 0mm
Tensile speed 10mm / min
Birefringence (Δn) 0.027
(Physical properties of non-woven fabric)
Basis weight 34.2g / m 2
Thickness (measurement load 3g / cm 2 ) 0.48mm
Tensile strength in MD direction 16550 g / 50 mm width Tensile breaking elongation 193%
Tensile strength in CD direction 8248g / 50mm width Tensile elongation at break 197%
Tensile conditions: Chuck distance 10mm
Tensile speed 10mm / min
[0018]
As is clear from the physical properties of these continuous fibers and the nonwoven fabric, the continuous fibers 15 obtained by the production method according to the present invention have a relatively small fineness, for example, 0.006 to 5.8d, Variation in fineness can be reduced. Such continuous fibers 15 are hardly thermally fused in the process until they become the nonwoven fabric 26, and are merely mechanically entangled. Further, since the continuous fibers 15 are continuous fibers, the degree of entanglement is weak, and the continuous fibers 15 are mutually intertwined. Do not constrain each other's movement. The nonwoven fabric 26 made of such continuous fibers 15 is flexible and has a good touch. In addition, the continuous fiber 15 drawn so that the birefringence index Δn is 0.019 to 0.030 is not highly oriented so that the extensibility of the continuous fiber 15 is significantly hindered, and the high breakage. Has elongation. For example, the continuous fiber 15 of the example extends to 6.38 mm in a tensile test when the distance between chucks is 0 mm. The nonwoven fabric 26 formed by mechanically intertwining the continuous fibers 15 with high-pressure water jets has an MD direction due to the high elongation at break of the continuous fibers 15 and the weak intertwining of the fibers 15. It has a high elongation at break of 100 to 300% in the CD direction. In the nonwoven fabric 26 of an Example, the breaking elongation of MD direction and CD direction is 193% and 197%.
[0019]
The nonwoven fabric 26 obtained according to the present invention can be used as a disposable wearing article such as a disposable diaper, a sanitary napkin, or a medical disposable gown, and can also be used as a filter, wet wipes, or the like.
[0020]
【The invention's effect】
According to the method for producing a polypropylene nonwoven fabric according to the present invention, polypropylene having a fineness of 0.006 to 5.8d, a birefringence of 0.019 to 0.030, and a tensile strength of 1 to 3 g / d. In this nonwoven fabric, the degree of orientation of polypropylene molecules during spinning of the continuous fibers is low, and the continuous fibers are not entangled so as to strongly restrain each other's movement. Such a nonwoven fabric is soft and soft to the touch, and has a high elongation at break.
[Brief description of the drawings]
FIG. 1 is a manufacturing process diagram of a nonwoven fabric.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Extruder 2 Soccer 3 Belt 4 High pressure water injection apparatus 11 Nozzle 15 Continuous fiber 16 Guide path 18 Inlet 19 Outlet 26 Nonwoven fabric

Claims (8)

ポリプロピレンの連続繊維からなる不織布において、
前記連続繊維が、０．００６〜５．８ｄの繊度と、０．０１９〜０．０３０の複屈折率と、１〜３ｇ／ｄの引張強度と、１００〜３００％の引張破断伸度とを有し、前記繊維どうしが、実質的に互いの機械的な交絡によって不織布形態を維持していることを特徴とする前記不織布。In non-woven fabric made of continuous polypropylene fibers,
The continuous fiber has a fineness of 0.006 to 5.8d, a birefringence of 0.019 to 0.030, a tensile strength of 1 to 3 g / d, and a tensile elongation at break of 100 to 300%. The nonwoven fabric is characterized in that the nonwoven fabric is maintained in a nonwoven fabric form by mechanical entanglement with each other. 多数のノズルから押出されるポリプロピレンの連続繊維を延伸した後、一方向へ走行するベルトに堆積させ、前記連続繊維どうしを互いに交絡させて、請求項１に記載の不織布を製造する方法において、
前記ノズルの近傍を溶融状態で押出されている前記連続繊維の温度付近となるように保温し、入口と出口とこれら両者間に延びる案内通路とを備え、前記案内通路には前記入口から出口へ向かう方向へ常温の圧縮エアーが吹出しているサッカーの前記案内通路へ前記連続繊維を導いて急冷し、前記ノズルと前記サッカーとの間において前記連続繊維を延伸して前記連続繊維の繊度を小さくし、かつ、前記ポリプロピレンの分子を所要の複屈折率が得られる程度にまで配向させることを特徴とする前記方法。In the method for producing a nonwoven fabric according to claim 1 , wherein the continuous fibers of polypropylene extruded from a number of nozzles are stretched and then deposited on a belt that travels in one direction, and the continuous fibers are entangled with each other.
The vicinity of the nozzle is kept warm so as to be close to the temperature of the continuous fiber extruded in a molten state, and includes an inlet, an outlet, and a guide passage extending between the two, the guide passage from the inlet to the outlet The continuous fiber is led to the guide passage of the soccer where the compressed air of normal temperature is blowing in the direction to be cooled rapidly, and the continuous fiber is stretched between the nozzle and the soccer to reduce the fineness of the continuous fiber. And aligning the polypropylene molecules to the extent that the required birefringence is obtained. 前記連続繊維が、前記ノズル近傍においては溶融温度にあって繊度が小さくなり、前記近傍から前記サッカーの入口に至るまでの間においては融点近くの温度にまで徐々に降下し、前記サッカー内部においては常温にまで急冷されつつ所要の複屈折率が得られる程度にまで延伸される請求項２記載の方法。  In the vicinity of the nozzle, the continuous fiber is at a melting temperature and the fineness becomes small. The method according to claim 2, wherein the film is stretched to such an extent that a required birefringence is obtained while being rapidly cooled to room temperature. 前記保温は、押出されている前記連続繊維とほぼ同じ温度の熱風が前記ノズルの近傍に吹出すことによってなされている請求項２または３に記載の方法。  The method according to claim 2 or 3, wherein the heat retaining is performed by blowing hot air having a temperature substantially the same as that of the extruded continuous fiber in the vicinity of the nozzle. 前記サッカー内部において、前記連続繊維の繊度が０．００６〜５．８ｄとなるように前記連続繊維を延伸する請求項２〜４のいずれか１項に記載の方法。  The method according to any one of claims 2 to 4, wherein the continuous fiber is drawn so that a fineness of the continuous fiber is 0.006 to 5.8d inside the soccer. 前記サッカー内部において、前記連続繊維の複屈折率が０．０１９〜０．０３０となるように前記ポリプロピレンの分子を配向させる請求項２〜５のいずれか１項に記載の方法。  The method according to any one of claims 2 to 5, wherein the polypropylene molecules are oriented so that the birefringence of the continuous fibers is 0.019 to 0.030 inside the soccer. 高圧水の噴射によって前記連続繊維どうしを交絡させる工程が含まれる請求項２〜６のいずれか１項に記載の方法。  The method according to any one of claims 2 to 6, further comprising a step of interlacing the continuous fibers by high-pressure water injection. 前記ノズルから前記ベルトまでの距離が４００〜６００ｍｍである請求項２〜７のいずれか１項に記載の方法。  The method according to any one of claims 2 to 7, wherein a distance from the nozzle to the belt is 400 to 600 mm.
JP33179399A 1999-11-22 1999-11-22 Polypropylene nonwoven fabric and method for producing the same Expired - Fee Related JP3662455B2 (en)

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KR1020000068308A KR20010060339A (en) 1999-11-22 2000-11-17 A polypropylene-based nonwoven fabric and a method for preparing it
CA002326263A CA2326263C (en) 1999-11-22 2000-11-17 Nonwoven fabric of polypropylene fiber
EP00310313A EP1101854B1 (en) 1999-11-22 2000-11-21 Nonwoven fabric of polypropylene fiber and process for making the same
AU71739/00A AU765499B2 (en) 1999-11-22 2000-11-21 Nonwoven fabric of polypropylene fiber and process for making the same
DE60036994T DE60036994T2 (en) 1999-11-22 2000-11-21 Nonwoven fabric of polypropylene fiber and process for its production
TW089124695A TW487756B (en) 1999-11-22 2000-11-21 Nonwoven fabric of polypropylene fiber and process for making the same
IDP20001009D ID28425A (en) 1999-11-22 2000-11-22 FABRIC IS NOT WOVEN FROM POLIPROPILENA FIBER AND ITS PROCESSING
SG200006800A SG87192A1 (en) 1999-11-22 2000-11-22 Nonwoven fabric of polypropylene fiber and process for making the same
BRPI0005847-5A BR0005847B1 (en) 1999-11-22 2000-11-22 Nonwoven fabrication process made of continuous polypropylene fiber.
CNB001309528A CN1237218C (en) 1999-11-22 2000-11-22 Non-woven fabric made of polypropylene and method for making same

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