JP2010185157A - Aliphatic polyester fiber for binder for papermaking - Google Patents

Aliphatic polyester fiber for binder for papermaking Download PDF

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JP2010185157A
JP2010185157A JP2009031142A JP2009031142A JP2010185157A JP 2010185157 A JP2010185157 A JP 2010185157A JP 2009031142 A JP2009031142 A JP 2009031142A JP 2009031142 A JP2009031142 A JP 2009031142A JP 2010185157 A JP2010185157 A JP 2010185157A
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fiber
papermaking
aliphatic polyester
binder
dtex
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Ryuji Furuki
竜二 古木
Kenji Inagaki
健治 稲垣
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Teijin Fibers Ltd
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Teijin Fibers Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an aliphatic polyester fiber for binders for papermaking excellent in thermal adhesion at a low temperature. <P>SOLUTION: This aliphatic polyester fiber for binders is provided by including an aliphatic polyester, and has 0.5 to 20.0 dtex fineness, 1 to 20 mm fiber length, 60 to 300% elongation at break and ≤0.01 birefringence. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、低温での熱接着性に優れた抄紙用バインダーポリエステル繊維に関する。   The present invention relates to a papermaking binder polyester fiber having excellent thermal adhesiveness at a low temperature.

従来、抄紙用の合成繊維としてビニロン繊維、ポリアクリロニトリル繊維、芳香族ポリエステル繊維などが使用されてきた。近年、機械的特性、電気的特性、耐熱性、寸法安定性等に優れ、かつコスト優位性の高いポリエチレンテレフタレート繊維を抄紙用原料の一部又は全部に使用することが多くなってきている。しかしポリエチレンテレフタレート繊維はガラス転移温度が約70℃、融点が約260℃と高温であることから、抄紙のカレンダー加工工程においては、200℃近い温度をかけないと十分な不織布強力が得られないという欠点を有していた(例えば、特許文献1、特許文献2、特許文献3参照。)。   Conventionally, vinylon fibers, polyacrylonitrile fibers, aromatic polyester fibers, and the like have been used as synthetic fibers for papermaking. In recent years, polyethylene terephthalate fibers, which are excellent in mechanical properties, electrical properties, heat resistance, dimensional stability, and the like and have a high cost advantage, are increasingly used for some or all of the papermaking raw materials. However, since the polyethylene terephthalate fiber has a high glass transition temperature of about 70 ° C. and a melting point of about 260 ° C., sufficient non-woven fabric strength cannot be obtained unless a temperature close to 200 ° C. is applied in the paper calendering process. There were drawbacks (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

特開2003−313726号公報JP 2003-313726 A 特開2003−339257号公報JP 2003-339257 A 特開2004−218110号公報JP 2004-218110 A

本発明は上記課題に鑑みてなされたものであり、その目的は低温での熱接着性に優れた抄紙用バインダー脂肪族ポリエステル繊維を提供することである。   This invention is made | formed in view of the said subject, The objective is to provide the binder aliphatic polyester fiber for papermaking excellent in the heat adhesiveness in low temperature.

本発明者は上記課題を達成するために鋭意検討した結果、本発明の抄紙用バインダーポリエステル繊維を発明するに至った。すなわち本発明は脂肪族ポリエステルからなり、繊度が0.5〜20.0dtex、繊維長が1〜20mm、破断伸度が60〜300%、複屈折率が0.02以下であるバインダー用(熱接着性)脂肪族ポリエステル繊維である。   As a result of intensive studies to achieve the above-mentioned problems, the present inventors have invented the papermaking binder polyester fiber of the present invention. That is, the present invention comprises an aliphatic polyester for binders having a fineness of 0.5 to 20.0 dtex, a fiber length of 1 to 20 mm, a breaking elongation of 60 to 300%, and a birefringence of 0.02 or less (heat Adhesive) aliphatic polyester fiber.

本発明によれば、低温での熱接着性に優れる抄紙用バインダー脂肪族ポリエステル繊維を得ることができる。   According to the present invention, it is possible to obtain a binder aliphatic polyester fiber for papermaking that has excellent thermal adhesiveness at low temperatures.

以下、本発明の実施の形態について詳細に説明する。
本発明の抄紙用バインダー繊維に用いられるポリマーとしては、脂肪族ポリエステルが好ましく用いられる。脂肪族ポリエステルとしては、ポリ乳酸、ポリヒドロキシブチレート、ポリグリコール酸若しくはポリカプロラクトン等のポリヒドロキシカルボン酸又は
ポリエチレンサクシネート、ポリブチレンサクシネート、ポリヘキサメチレンサクシネート、ポリエチレンアジペート、ポリブチレンアジペート、ポリヘキサメチレンアジペート、ポリエチレンセバケート、ポリブチレンセバケート、ポリヘキサメチレンセバケート等の脂肪族ジカルボン酸と脂肪族ジオールから得られる脂肪族ポリエステルが挙げられる。中でも、ポリ乳酸が好ましく用いられる。
Hereinafter, embodiments of the present invention will be described in detail.
As the polymer used for the papermaking binder fiber of the present invention, an aliphatic polyester is preferably used. Aliphatic polyesters include polylactic acid such as polylactic acid, polyhydroxybutyrate, polyglycolic acid or polycaprolactone, or polyethylene succinate, polybutylene succinate, polyhexamethylene succinate, polyethylene adipate, polybutylene adipate, poly Examples thereof include aliphatic polyesters obtained from aliphatic dicarboxylic acids and aliphatic diols such as hexamethylene adipate, polyethylene sebacate, polybutylene sebacate, and polyhexamethylene sebacate. Of these, polylactic acid is preferably used.

なおこれらのポリマーには、公知の添加剤、例えば顔料、染料、艶消し剤、防汚剤、抗菌剤、消臭剤、蛍光増白剤、難燃剤、紫外線吸収剤、滑剤等を含んでもよい。特に艶消し剤として二酸化チタンが含まれる場合を好ましく採用することができる。   These polymers may contain known additives such as pigments, dyes, matting agents, antifouling agents, antibacterial agents, deodorants, fluorescent whitening agents, flame retardants, ultraviolet absorbers, lubricants and the like. . In particular, the case where titanium dioxide is contained as a matting agent can be preferably employed.

本発明の抄紙用バインダー繊維の単糸繊度は、0.5〜20.0dtexであることが必要である。より好ましくは、1.0〜10.0dtexである。単糸繊度が0.5dtexより小さいと、繊維が極めて柔軟であるため、抄紙の際に繊維同士が絡まりやすく分散性が阻害され、十分な品位の湿式不織布が得られない。また単糸繊度が20.0dtexより大きいと、単位面積あたりのバインダー繊維数が少なくなるため、接着点の数が減少し、得られる湿式不織布の強度が十分でない。   The single yarn fineness of the papermaking binder fiber of the present invention is required to be 0.5 to 20.0 dtex. More preferably, it is 1.0-10.0 dtex. When the single yarn fineness is less than 0.5 dtex, the fibers are extremely flexible, and thus the fibers tend to get tangled with each other during paper making, dispersibility is impaired, and a wet nonwoven fabric of sufficient quality cannot be obtained. On the other hand, if the single yarn fineness is larger than 20.0 dtex, the number of binder fibers per unit area decreases, so the number of adhesion points decreases and the strength of the resulting wet nonwoven fabric is not sufficient.

本発明の抄紙用バインダー繊維の長さは、1〜20mmであることが必要である。より好ましくは、2〜10mmである。繊維の長さが1mm未満であると、水中への分散性が低下するだけでなく、製造時の切断抵抗が大きくなるため、繊維が伸ばされたり短繊維同士が絡みやすくなり、安定した切断が難しくなるとともに、得られるバインダー繊維中に繊維塊が多くなって水中への分散性が極端に悪くなるので好ましくない。また20mmを越えて長くなると、抄紙の際に十分な分散性が得られず、好ましくない。   The length of the papermaking binder fiber of the present invention is required to be 1 to 20 mm. More preferably, it is 2-10 mm. If the length of the fiber is less than 1 mm, not only the dispersibility in water decreases, but also the cutting resistance at the time of production increases, so that the fibers are easily stretched or tangled with each other, and stable cutting is achieved. This is not preferable because it becomes difficult and the amount of fiber mass increases in the resulting binder fiber, resulting in extremely poor dispersibility in water. On the other hand, if the length exceeds 20 mm, sufficient dispersibility cannot be obtained during papermaking, which is not preferable.

本発明のバインダー用脂肪族ポリエステル繊維の破断伸度は、60〜300%であることが必要である。より好ましくは、80〜200%である。破断伸度が60%未満であると、得られる湿式不織布の強度が十分でない。また300%を越えると、抄紙の際に繊維が絡まりやすくなり、分散性を阻害する。   The breaking elongation of the aliphatic polyester fiber for binder of the present invention needs to be 60 to 300%. More preferably, it is 80 to 200%. When the breaking elongation is less than 60%, the strength of the resulting wet nonwoven fabric is not sufficient. On the other hand, if it exceeds 300%, the fibers tend to be entangled during papermaking, thereby inhibiting the dispersibility.

本発明の脂肪族ポリエステルの複屈折率は、0.02以下であることが必要である。複屈折率が0.02を越えると分子配向が進んでいるため、接着性が不足し、得られる湿式不織布の強度が十分でない。その繊維の複屈折率0.01以下であることが好ましい。   The birefringence of the aliphatic polyester of the present invention needs to be 0.02 or less. When the birefringence exceeds 0.02, molecular orientation is advanced, so that the adhesiveness is insufficient and the strength of the resulting wet nonwoven fabric is not sufficient. The birefringence of the fiber is preferably 0.01 or less.

本発明の抄紙用繊維は、優れた低温での接着性を有するので、抄紙加工時のエネルギーコストを低減することができる。   Since the fiber for papermaking of this invention has the adhesiveness in the low temperature which was excellent, the energy cost at the time of paperworking can be reduced.

次に本発明の抄紙用バインダー繊維の製造方法について説明する。本発明のバインダー繊維は、脂肪族ポリエステルを用い、紡糸口金のノズルから吐出されたポリマー流に冷却風をあて、紡糸速度1300m/min以下で引き取り、未延伸糸条を得る。   Next, the manufacturing method of the binder fiber for papermaking of this invention is demonstrated. The binder fiber of the present invention uses aliphatic polyester, applies cooling air to the polymer stream discharged from the nozzle of the spinneret, and draws it at a spinning speed of 1300 m / min or less to obtain an undrawn yarn.

次いで、CDR(冷延伸倍率:cold draw ratio)の0.8倍以下の倍率で延伸、もしくは延伸処理を実施せずに糸条束に抄紙用の油剤を付与し、捲縮を付与することなく、熱処理を施すことなく、1〜20mmの長さに切断して抄紙用バインダー繊維が製造される。このとき延伸倍率がCDRの0.8倍を超えると、分子の配向が進み、接着性が低下する。また熱処理を施すと分子の結晶化が進み、接着性が低下する。   Next, without drawing or crimping, an oil agent for papermaking is applied to the yarn bundle without performing drawing or drawing at a magnification of 0.8 times or less of the CDR (cold draw ratio). Without being subjected to heat treatment, it is cut to a length of 1 to 20 mm to produce a papermaking binder fiber. At this time, when the draw ratio exceeds 0.8 times the CDR, the orientation of the molecules proceeds and the adhesiveness decreases. In addition, when heat treatment is performed, the crystallization of molecules proceeds and the adhesiveness decreases.

次に本発明の実施例及び比較例を詳述するが、本発明はこれらによって限定されるものではない。なお、実施例中の各測定項目は下記の方法で測定した。
(1)繊度
JIS L1015:2005 8.5.1 A法により測定した。
(2)伸度
JIS L1015:2005 8.7.1 法により測定した。
(3)複屈折率
市販の偏光顕微鏡によって、光源にナトリウムランプを用い、試料をα−ブロムナフタリンに浸漬した状態下でBerekコンペンセータ法からレタデーションを求めて計算した。なお、測定回数(n数)を5回としてその平均値を求めた。
(4)裂断長
繊維を水中でよく撹拌、混合して分散させ、大きさが約25cm×約25cmで、目付けが約50g/cmのシートを作製する。該シートを濾紙の間に挟んで、熊谷理機工業株式会社製の高温用回転型乾燥機を使って表面温度80℃の条件で、熱処理を行う。この熱処理されたシートを表面温度120℃、線圧180kg/cmの条件でカレンダー加工を行う。得られたシートを、JIS P8113に従って引張り強さを測定し、裂断長で表した。
Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.
(1) Fineness Measured by JIS L1015: 2005 8.5.1 A method.
(2) Elongation Measured according to JIS L1015: 2005 8.7.1 method.
(3) Birefringence index It calculated | required and calculated | required the retardation from the Berek compensator method in the state which immersed the sample in alpha-bromo naphthalene using the sodium lamp for the light source with the commercially available polarizing microscope. In addition, the average value was calculated | required by making the frequency | count of a measurement (n number) into 5 times.
(4) Breaking length The fibers are thoroughly stirred, mixed and dispersed in water to produce a sheet having a size of about 25 cm × about 25 cm and a basis weight of about 50 g / cm 2 . The sheet is sandwiched between filter papers, and heat treatment is performed under the condition of a surface temperature of 80 ° C. using a high-temperature rotary dryer manufactured by Kumagai Riki Kogyo Co., Ltd. The heat-treated sheet is calendered under conditions of a surface temperature of 120 ° C. and a linear pressure of 180 kg / cm. The obtained sheet was measured for tensile strength according to JIS P8113 and expressed in terms of tear length.

[参考例1]
ネイチャーワークス社製ポリ−L−乳酸チップを乾燥後、225℃で溶融し、孔数が1008の紡糸口金を通して、510g/分で吐出し、1300m/分の速度で引取った。この繊維を収束し、約14万dtexのトウにした後、温水中で2.4倍に延伸し、酸成分がモル比でテレフタル酸が80%、イソフタル酸が20%と数平均分子量3000のポリエチレングリコール70重量%とを共重合した数平均分子量が約10000のポリエーテル・ポリエステル共重合体のエマルジョン(濃度2%)を通過させ、約12%の水分率になるように絞った後、乾燥せずに5mmの繊維長に切断し、単糸繊度が1.6dtexの抄紙用主体繊維を得た。
[Reference Example 1]
A poly-L-lactic acid chip manufactured by Nature Works was dried, melted at 225 ° C., discharged through a spinneret having a hole number of 1008 at 510 g / min, and taken up at a rate of 1300 m / min. After converging this fiber to make a tow of about 140,000 dtex, the fiber is stretched 2.4 times in warm water, and the acid component has a molar ratio of terephthalic acid of 80%, isophthalic acid of 20% and a number average molecular weight of 3000. After passing through an emulsion (concentration 2%) of a polyether / polyester copolymer having a number average molecular weight of about 10,000 copolymerized with 70% by weight of polyethylene glycol, the mixture is squeezed to a moisture content of about 12%, and then dried. Without cutting, it was cut into a fiber length of 5 mm to obtain a main fiber for papermaking having a single yarn fineness of 1.6 dtex.

[実施例1]
ネイチャーワークス社製ポリ−L−乳酸チップを乾燥後、225℃で溶融し、孔数が3006の紡糸口金を通して、440g/分で吐出し、1000m/分の速度で引取った。この繊維を収束し、約14万dtexのトウにした後、延伸せずに、酸成分がモル比でテレフタル酸が80%、イソフタル酸が20%と数平均分子量3000のポリエチレングリコール70重量%とを共重合した数平均分子量が約10000のポリエーテル・ポリエステル共重合体のエマルジョン(濃度2%)を通過させ、約12%の水分率になるように絞った後、乾燥せずに5mmの繊維長に切断し、単糸繊度が1.5dtexの抄紙用バインダー繊維を得た。該抄紙用バインダー繊維40重量%と参考例1により作製したポリ乳酸主体繊維60重量%からなる湿式不織布の裂断長を評価した結果を表1に示した。
[Example 1]
A poly-L-lactic acid chip manufactured by Nature Works was dried, melted at 225 ° C., discharged through a spinneret having a hole number of 3006 at 440 g / min, and taken up at a rate of 1000 m / min. After converging this fiber to make a tow of about 140,000 dtex, without stretching, the acid component was 80% by weight of terephthalic acid, 20% of isophthalic acid, and 70% by weight of polyethylene glycol having a number average molecular weight of 3000. After passing through an emulsion (concentration 2%) of a polyether / polyester copolymer having a number average molecular weight of about 10,000, the fiber is squeezed to a moisture content of about 12%, and then dried to a 5 mm fiber. Cut into long pieces, a papermaking binder fiber having a single yarn fineness of 1.5 dtex was obtained. Table 1 shows the results of evaluating the breaking length of a wet nonwoven fabric composed of 40% by weight of the papermaking binder fiber and 60% by weight of the polylactic acid-based fiber prepared in Reference Example 1.

[参考例2]
ポリエチレンテレフタレートチップを乾燥後、285℃で溶融し、孔数が600の紡糸口金を通して、350g/分で吐出し、1200m/分の速度で引取った。この繊維を収束し、約14万dtexのトウにした後、温水中で3.3倍に延伸し、酸成分がモル比でテレフタル酸が80%、イソフタル酸が20%と数平均分子量3000のポリエチレングリコール70重量%とを共重合した数平均分子量が約10000のポリエーテル・ポリエステル共重合体のエマルジョン(濃度2%)を通過させ、約12%の水分率になるように絞った後、乾燥せずに5mmの繊維長に切断し、単糸繊度が1.6dtexの抄紙用主体繊維を得た。
[Reference Example 2]
The polyethylene terephthalate chip was dried, melted at 285 ° C., discharged through a spinneret having 600 holes at 350 g / min, and taken up at a rate of 1200 m / min. After converging this fiber to make a tow of about 140,000 dtex, the fiber is stretched 3.3 times in warm water, and the acid component has a molar ratio of terephthalic acid of 80%, isophthalic acid of 20% and a number average molecular weight of 3000. After passing through an emulsion (concentration 2%) of a polyether / polyester copolymer having a number average molecular weight of about 10,000 copolymerized with 70% by weight of polyethylene glycol, the mixture is squeezed to a moisture content of about 12%, and then dried. Without cutting, it was cut into a fiber length of 5 mm to obtain a main fiber for papermaking having a single yarn fineness of 1.6 dtex.

[比較例1]
ポリエチレンテレフタレートチップを乾燥後、285℃で溶融し、孔数が1192の紡糸口金を通して、181g/分で吐出し、1300m/分の速度で引取った。この繊維を収束し、約14万dtexのトウにした後、延伸せずに、酸成分がモル比でテレフタル酸が80%、イソフタル酸が20%と数平均分子量3000のポリエチレングリコール70重量%とを共重合した数平均分子量が約10000のポリエーテル・ポリエステル共重合体のエマルジョン(濃度2%)を通過させ、約12%の水分率になるように絞った後、乾燥せずに5mmの繊維長に切断し、単糸繊度が1.2dtexの抄紙用バインダー繊維を得た。該抄紙用バインダー繊維40重量%と参考例2により作製したポリエチレンテレフタレート主体繊維60重量%からなる湿式不織布の裂断長を評価した結果を表1に示した。
[Comparative Example 1]
The polyethylene terephthalate chip was dried, melted at 285 ° C., discharged through a spinneret having a hole number of 1192 at 181 g / min, and taken up at a rate of 1300 m / min. After converging this fiber to make a tow of about 140,000 dtex, without stretching, the acid component was 80% by weight of terephthalic acid, 20% of isophthalic acid, and 70% by weight of polyethylene glycol having a number average molecular weight of 3000. After passing through an emulsion (concentration 2%) of a polyether / polyester copolymer having a number average molecular weight of about 10,000, the fiber is squeezed to a moisture content of about 12%, and then dried to a 5 mm fiber. Cut into long pieces, a papermaking binder fiber having a single yarn fineness of 1.2 dtex was obtained. Table 1 shows the results of evaluating the breaking length of a wet nonwoven fabric composed of 40% by weight of the papermaking binder fiber and 60% by weight of the polyethylene terephthalate-based fiber prepared in Reference Example 2.

本発明によれば、低温での接着性に優れた抄紙用バインダー繊維を得ることができ、該バインダー繊維を用いた場合、抄紙加工時のカレンダー加工工程の温度を下げることができ、その工業的価値は極めて大である。   According to the present invention, it is possible to obtain a papermaking binder fiber having excellent adhesion at low temperature. When the binder fiber is used, the temperature of the calendering process at the time of papermaking can be lowered, and its industrial The value is tremendous.

Claims (6)

脂肪族ポリエステルからなり、単糸繊度が0.5〜20.0dtex、繊維長が1〜20mm、破断伸度が60〜300%、複屈折率が0.02以下であるバインダー用脂肪族ポリエステル繊維。   Aliphatic polyester fiber for binders comprising an aliphatic polyester and having a single yarn fineness of 0.5 to 20.0 dtex, a fiber length of 1 to 20 mm, a breaking elongation of 60 to 300%, and a birefringence of 0.02 or less. . 脂肪族ポリエステルがポリ乳酸である請求項1記載のバインダー用脂肪族ポリエステル繊維。   The aliphatic polyester fiber for a binder according to claim 1, wherein the aliphatic polyester is polylactic acid. 繊維の単糸繊度が1.0〜10.0dtexである請求項1又は2記載のバインダー用脂肪族ポリエステル繊維。   The aliphatic polyester fiber for a binder according to claim 1 or 2, wherein the single yarn fineness of the fiber is 1.0 to 10.0 dtex. 繊維の繊維長が2〜10mmである請求項1〜3のいずれか1項記載のバインダー用脂肪族ポリエステル繊維。   The aliphatic polyester fiber for a binder according to any one of claims 1 to 3, wherein the fiber has a fiber length of 2 to 10 mm. 繊維の破断伸度が80〜200%である請求項1〜4のいずれか1項記載のバインダー用脂肪族ポリエステル繊維。   The aliphatic polyester fiber for a binder according to any one of claims 1 to 4, wherein the breaking elongation of the fiber is 80 to 200%. 繊維の複屈折率が0.01以下である請求項1〜5のいずれか1項記載のバインダー用脂肪族ポリエステル繊維。   The aliphatic polyester fiber for a binder according to any one of claims 1 to 5, wherein the birefringence of the fiber is 0.01 or less.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07133569A (en) * 1993-11-10 1995-05-23 Toyobo Co Ltd Biodegradable nonwoven fabric
JPH0823870A (en) * 1994-07-20 1996-01-30 Showa Highpolymer Co Ltd Paper, nonwoven fabric and casing film using biodegradable resin
JPH0995848A (en) * 1995-10-03 1997-04-08 Unitika Ltd Biodegradable filament nonwoven fabric for forming and its production
JP2000136479A (en) * 1998-10-27 2000-05-16 Unitika Ltd Nonwoven fabric for molding having biodegradability, its production and article having vessel shape using the same nonwoven fabric
JP2003138424A (en) * 2001-10-30 2003-05-14 Teijin Ltd Polyester fiber for binder
JP2003286640A (en) * 2002-03-27 2003-10-10 Unitika Ltd Short fiber nonwoven fabric

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07133569A (en) * 1993-11-10 1995-05-23 Toyobo Co Ltd Biodegradable nonwoven fabric
JPH0823870A (en) * 1994-07-20 1996-01-30 Showa Highpolymer Co Ltd Paper, nonwoven fabric and casing film using biodegradable resin
JPH0995848A (en) * 1995-10-03 1997-04-08 Unitika Ltd Biodegradable filament nonwoven fabric for forming and its production
JP2000136479A (en) * 1998-10-27 2000-05-16 Unitika Ltd Nonwoven fabric for molding having biodegradability, its production and article having vessel shape using the same nonwoven fabric
JP2003138424A (en) * 2001-10-30 2003-05-14 Teijin Ltd Polyester fiber for binder
JP2003286640A (en) * 2002-03-27 2003-10-10 Unitika Ltd Short fiber nonwoven fabric

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