JP2008031600A - Heat-resistant spun bond and cleaning sheet - Google Patents

Heat-resistant spun bond and cleaning sheet Download PDF

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JP2008031600A
JP2008031600A JP2006207987A JP2006207987A JP2008031600A JP 2008031600 A JP2008031600 A JP 2008031600A JP 2006207987 A JP2006207987 A JP 2006207987A JP 2006207987 A JP2006207987 A JP 2006207987A JP 2008031600 A JP2008031600 A JP 2008031600A
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heat
nonwoven fabric
resistant
fiber
cleaning sheet
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Takashi Koida
貴史 恋田
Toshiya Yamamoto
俊也 山本
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Toyobo Co Ltd
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Toyobo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-resistant filament nonwoven fabric excellent in thermal shrinkage, strength, chemical resistance, acid resistance, lint free property and recyclability, and to provide a cleaning roll using the nonwoven fabric and used for copying machines. <P>SOLUTION: This heat-resistant filament nonwoven fabric has a melting point of ≥260°C, a longitudinal strength of ≥50 N/5cm, and a dry heat shrinkage rate of ≤1.5%, when thermally treated at 200°C for one hour. The heat-resistant filament nonwoven fabric uses a heat-resistant thermoplastic resin being polyphenylene sulfide. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、耐熱性があり強度が強く耐薬品、耐酸性に優れた耐熱性長繊維不織布に関する。またその耐熱性長繊維不織布を複写機やプリンタのクリーニングロールに使用すると、高温下において長期間使用しても物性変化が少なく、且つ長繊維なので繊維脱落が少なく、100%耐熱繊維であるため使用後のリサイクルが可能なクリーニングシートに関する。   The present invention relates to a heat-resistant long fiber nonwoven fabric having heat resistance, high strength, and excellent chemical resistance and acid resistance. In addition, if the heat-resistant long fiber nonwoven fabric is used in a cleaning roll of a copying machine or a printer, it will not change even if it is used for a long period of time at high temperatures, and since it is a long fiber, it will not fall off and is used because it is 100% heat-resistant fiber. The present invention relates to a cleaning sheet that can be recycled later.

現在、複写機、レーザービームプリンタ、ファクシミリ等の電子写真装置においては、定着ロールと加圧ロールとの間に、未定着トナー像を担持した紙やフィルム等の複写シートを供給し、加熱及び加圧によって複写シートの表面にトナーを定着する手段が一般的に用いられている。かかる構造を有する電子写真装置においては、ローラーに付着した不要化したトナーを除去するクリーニングシートが必要となるため、電子写真装置に適したクリーニングシートの多くの検討がなされており、例えば全芳香族ポリアミド繊維と未延伸ポリエステル繊維とを配合した繊維ウェブを熱カレンダーロールによって加熱・加圧して製造された不織布が開示されている(例えば特許文献1参照)。しかしながら、電子写真装置内の加熱ロールに用いた場合、ポリエステル繊維が溶融フィルム化し、トナー除去性能が低下するという問題点を有していた。かかる問題を解決するため、パラ系アラミド繊維等の耐熱性繊維と融点が200℃以上の熱可塑性樹脂からなるシートが開示されている。かかる構成であれば、トナー除去性能の温度依存性が小さくなると考えられる。しかしながら、かかるシートであっても近年特に電子写真装置において強く求められている要請を満たすことができない。即ち、近年電子写真装置の高速化が急激に進むにつれ、シートとローラーとの摩擦が高くなり、繊維屑や熱可塑性接着繊維の溶融物等がローラーに付着し、これによる印刷不良が発生するという問題点を有するものであ。
また、従来のクリーニングシートは接着性繊維等を用いていたため、使用済みシートの分別が難しく、焼却処分するしかなかった。
特開平6−3999号公報 特開2005−266470号公報
At present, in an electrophotographic apparatus such as a copying machine, a laser beam printer, and a facsimile, a copy sheet such as paper or film carrying an unfixed toner image is supplied between a fixing roll and a pressure roll, and heated and heated. A means for fixing toner on the surface of a copy sheet by pressure is generally used. In an electrophotographic apparatus having such a structure, a cleaning sheet that removes unnecessary toner adhering to a roller is required. Therefore, many studies on a cleaning sheet suitable for an electrophotographic apparatus have been made. A nonwoven fabric manufactured by heating and pressurizing a fiber web containing polyamide fibers and unstretched polyester fibers with a heat calender roll is disclosed (for example, see Patent Document 1). However, when used as a heating roll in an electrophotographic apparatus, there is a problem that the polyester fibers are melted and the toner removal performance is lowered. In order to solve this problem, a sheet made of a heat-resistant fiber such as para-aramid fiber and a thermoplastic resin having a melting point of 200 ° C. or higher is disclosed. With such a configuration, it is considered that the temperature dependency of the toner removal performance is reduced. However, even such a sheet cannot satisfy a demand that has been strongly demanded especially in electrophotographic apparatuses in recent years. In other words, as the speed of electrophotographic devices has rapidly increased in recent years, the friction between the sheet and the roller increases, and fiber scraps or melted thermoplastic adhesive fibers adhere to the roller, resulting in poor printing. It has a problem.
Further, since the conventional cleaning sheet uses adhesive fibers or the like, it is difficult to separate used sheets, and there is no choice but to dispose of them by incineration.
JP-A-6-3999 JP 2005-266470 A

本発明は上記、従来技術の背景になされたもので、加熱ロールによる溶融フィルム化を防ぎ且つ繊維脱落が少なく、更には、使用後のクリーニングロールのリサイクルが可能とすることを課題とするものである。   The present invention has been made in the background of the above-described prior art, and it is an object of the present invention to prevent melt film formation with a heating roll, less fiber dropping, and to enable recycling of a cleaning roll after use. is there.

本発明者らは、上記課題を解決するため、鋭意研究した結果、遂に本発明を完成するに至った。即ち本発明は(1)融点が260℃以上、縦強度が50N/5cm以上、200℃1時間熱処理したときの乾熱収縮率1.5%以下であることを特徴する耐熱長繊維不織布、(2)使用する耐熱熱可塑性樹脂がポリフェニレンサルファイドであることを特徴とする(1)記載の耐熱長繊維不織布、(3)(1)又は(2)記載の耐熱長繊維不織布からなることを特徴とするコピー機用のクリーニングシート、である。   As a result of intensive studies to solve the above problems, the present inventors have finally completed the present invention. That is, the present invention is (1) a heat-resistant long fiber nonwoven fabric characterized by having a melting point of 260 ° C. or higher, a longitudinal strength of 50 N / 5 cm or higher, and a dry heat shrinkage of 1.5% or less when heat-treated at 200 ° C. for 1 hour; 2) The heat-resistant thermoplastic resin used is polyphenylene sulfide, the heat-resistant long-fiber nonwoven fabric according to (1), and the heat-resistant long-fiber nonwoven fabric according to (3) (1) or (2), Cleaning sheet for a copier.

本発明の耐熱性不織布は、繊維屑が少なく、高温においても溶融する成分を含まないため、コピー機クリーニングシートとして用いた場合、コピー機の高速化に十分に対応することが可能となり、更には耐熱性成分のみでクリーニングシートとすることが可能であるため、リサイクルできるという利点がある。   Since the heat-resistant nonwoven fabric of the present invention has less fiber waste and does not contain components that melt even at high temperatures, when used as a copying machine cleaning sheet, it is possible to sufficiently cope with high-speed copying machines. Since the cleaning sheet can be made of only the heat-resistant component, there is an advantage that it can be recycled.

以下本発明を詳細に説明する。
本発明の耐熱性長繊維不織布は融点が260℃以上であることが好ましい。融点が260℃以上である長繊維不織布であれば、コピー機等、高温で高摩擦を受ける過酷な使用環境においても、繊維屑や溶融劣化物等異物の発生が極めて少なく、機械の故障防止、印刷不良低減、部品交換周期の延長等、極めて有用な不織布となるからである。また、一の耐熱性素材のみで不織布を構成することができるため、他成分が偏在がない、均一な不織布となって、クリーニング特性等、性能が安定するという利点も有する。
なお、本発明における「融点」とはJIS K 7121に規定されている示差熱分析により得られる示差熱分析曲線(DTA曲線)から得られる温度をいう。
The present invention will be described in detail below.
The heat resistant long fiber nonwoven fabric of the present invention preferably has a melting point of 260 ° C. or higher. If the long-fiber nonwoven fabric has a melting point of 260 ° C. or higher, the occurrence of foreign matter such as fiber scraps and melt-degraded materials is extremely low even in harsh use environments that receive high friction at high temperatures, such as copy machines, preventing machine failures, This is because the nonwoven fabric is extremely useful for reducing printing defects and extending the part replacement cycle. Moreover, since a nonwoven fabric can be comprised only with one heat resistant material, it has the advantage that it becomes a uniform nonwoven fabric without other components unevenly distributed, and performance, such as a cleaning characteristic, is stabilized.
The “melting point” in the present invention refers to a temperature obtained from a differential thermal analysis curve (DTA curve) obtained by differential thermal analysis specified in JIS K7121.

本発明の耐熱長繊維不織布は、縦強度が50N/5cm以上であることが好ましい。かかる強度を有するものであれば、テープ状としたとき、過酷な摩擦等を受けても、安定して使用することができるからである。 The heat-resistant long fiber nonwoven fabric of the present invention preferably has a longitudinal strength of 50 N / 5 cm or more. This is because if it has such strength, it can be used stably even when subjected to severe friction when it is made into a tape.

本発明の耐熱長繊維不織布は、200℃1時間熱処理したときの乾熱収縮率1.5%以下であることが好ましい。乾熱収縮率が1.5%以下であれば、高温で使用される環境下においても皺の発生が小さく、クリーニングシートとして用いた場合、高いクリーニング性を安定に得ることができるからである。より好ましい乾熱収縮率は1.3%以下、更に好ましくは1.1%以下である。 The heat-resistant long fiber nonwoven fabric of the present invention preferably has a dry heat shrinkage of 1.5% or less when heat-treated at 200 ° C. for 1 hour. This is because if the dry heat shrinkage is 1.5% or less, wrinkles are small even in an environment used at high temperatures, and high cleaning properties can be stably obtained when used as a cleaning sheet. A more preferable dry heat shrinkage rate is 1.3% or less, and even more preferably 1.1% or less.

本発明の耐熱長繊維不織布に用いる素材は、ポリテトラフルオロエチレン、ポリフェニレンサルファイド(以下 PPS)などを挙げることができるが、PPSはリサイクル可能な上、最終的に焼却処分しても有害ガスの発生が少なく、特に好ましい。 Examples of the material used for the heat-resistant long fiber nonwoven fabric of the present invention include polytetrafluoroethylene and polyphenylene sulfide (hereinafter referred to as PPS). PPS is recyclable and generates harmful gases even if it is finally incinerated. Is particularly preferable.

本発明のクリーニングシートである不織布は、長繊維不織布であるためクリーニング時の摩擦による繊維屑発生は少なく、偏在していないことによって、トナー等の払拭性に優れているためである。このような状態は短繊維不織布においては困難である。つまり短繊維の繊維脱落によって熱ロール表面に繊維屑が付着してクリーニング性が低下してしまう。 This is because the nonwoven fabric, which is the cleaning sheet of the present invention, is a long-fiber nonwoven fabric, so that there is little generation of fiber waste due to friction during cleaning, and since it is not unevenly distributed, it has excellent wiping properties for toner and the like. Such a state is difficult in a short fiber nonwoven fabric. In other words, fiber scraps adhere to the surface of the hot roll due to the fiber dropping of the short fibers, and the cleaning property is deteriorated.

本発明の不織布(クリーニングシート)の目付、厚さは特に限定するものではないが、目付は20〜60g/m2、厚さは0.02〜0.20mmであるのが好ましく、より好ましくは0.02〜0.15mmである。0.02mm以下だと、熱圧着を過多にかけるもしくは目付を下げることになり、以下記述する所望の引張強度が発現ることが困難となる。また、0.20mm以下であれば、例えばクリーニングシート等をロール形状に一定量巻きつけて用いる場合、巻長さを大きくすることが可能となり、交換周期を延長することができる。 The basis weight and thickness of the nonwoven fabric (cleaning sheet) of the present invention are not particularly limited, but the basis weight is preferably 20 to 60 g / m 2 and the thickness is preferably 0.02 to 0.20 mm, more preferably 0. 0.02 to 0.15 mm. If it is 0.02 mm or less, excessive thermocompression bonding or a low basis weight will occur, and it will be difficult to develop the desired tensile strength described below. In addition, when the thickness is 0.20 mm or less, for example, when a cleaning sheet or the like is wound around a roll shape in a certain amount, the winding length can be increased and the replacement cycle can be extended.

本発明の耐熱性長繊維不織布は、コピー機用クリーニングシートとして用いてもよい。本発明の耐熱性長繊維不織布は、耐熱性、耐摩耗性及び払拭性に優れているため、コピー機定着部材のクリーニングシートとして用いると、異物発生が劇的に低減され、クリーニング性能、印刷不良を低減することができるからである。より具体的には、複写機、レーザービームプリンター、又はファクシミリなどの電子写真装置における定着ロールを挙げることができ、定着ロールの他に、定着ロールに代って複写シートへトナーを直接定着させることのできる循環ベルト、定着ロール又は前記循環ベルトと接触して設けられており、トナーが転写される転写ロール、を例示することができる。 The heat-resistant long fiber nonwoven fabric of the present invention may be used as a copying machine cleaning sheet. Since the heat-resistant long fiber nonwoven fabric of the present invention is excellent in heat resistance, abrasion resistance and wiping property, when used as a cleaning sheet for a copying machine fixing member, the generation of foreign matters is dramatically reduced, and the cleaning performance and printing defects are reduced. This is because it can be reduced. More specifically, examples include a fixing roll in an electrophotographic apparatus such as a copying machine, a laser beam printer, or a facsimile machine. In addition to the fixing roll, the toner is directly fixed on the copy sheet in place of the fixing roll. Examples thereof include a circulation belt, a fixing roll, or a transfer roll provided in contact with the circulation belt to which toner is transferred.

本発明のクリーニングシートは定着部材に対して押圧することにより、トナー等を払拭できるものであるが、トナー等の払拭性を高めるために、オイルを含有していても良い。このオイルとしては、例えば、メチルシリコーンオイル、ジメチルシリコーンオイル、エチルシリコーンオイル、フェニルシリコーンオイル、アミノ変性シリコーンオイル、エポキシ変性シリコーンオイル、メルカプト変性シリコーンオイル、3,3,3−トリフロロプロピルシリコーンオイルなどのシリコーンオイルを単独で、又は混合して含んでいることができる。なお、オイルの付着量はクリーニングシートの厚さなどによって異なるが、100g/m2以下であるのが好ましい。また、オイルの粘度は定着部材表面におけるオイルの拡散性に優れているように、10〜30,000センチストークスであるのが好ましい。   The cleaning sheet of the present invention can wipe off the toner and the like by pressing against the fixing member, but may contain oil in order to improve the wiping property of the toner and the like. Examples of the oil include methyl silicone oil, dimethyl silicone oil, ethyl silicone oil, phenyl silicone oil, amino modified silicone oil, epoxy modified silicone oil, mercapto modified silicone oil, 3,3,3-trifluoropropyl silicone oil, and the like. These silicone oils can be included alone or in admixture. In addition, although the adhesion amount of oil changes with thickness of a cleaning sheet, etc., it is preferable that it is 100 g / m <2> or less. Further, the viscosity of the oil is preferably 10 to 30,000 centistokes so that the oil diffusibility on the surface of the fixing member is excellent.

本発明の耐熱性長繊維の繊度は特に限定するものではないが、3.3dtex以下であるのが好ましい。これは、耐熱長繊維は後述のように繊維形態を消滅させて繊維交点で凝集し、凝固するが、熱可塑性樹脂繊維が細ければ、熱可塑性樹脂繊維が繊維形態でなくなることによって繊維分散の均一性を損なわず、また、不織布(クリーニングシート)全体にわたって均一に熱可塑性樹脂が凝固した、個々の耐熱性繊維による払拭性を利用できる、払拭性に優れる不織布(クリーニングシート)を製造できるためである。より好ましい繊度は2.2dtex以下であり、更に好ましい繊度は1.6dtex以下である。熱可塑性樹脂繊維の繊度の下限は特に限定するものではないが、0.01dtex以上であるのが好ましい。 The fineness of the heat-resistant long fiber of the present invention is not particularly limited, but is preferably 3.3 dtex or less. This is because heat-resistant long fibers disappear as described later and aggregate and solidify at the intersections of fibers, but if the thermoplastic resin fibers are thin, the thermoplastic resin fibers are no longer in fiber form, and the fiber dispersion is reduced. It is possible to produce a non-woven fabric (cleaning sheet) excellent in wiping property that can use the wiping property by individual heat-resistant fibers, in which the thermoplastic resin coagulates uniformly throughout the non-woven fabric (cleaning sheet) without losing uniformity. is there. A more preferable fineness is 2.2 dtex or less, and a still more preferable fineness is 1.6 dtex or less. Although the minimum of the fineness of a thermoplastic resin fiber is not specifically limited, It is preferable that it is 0.01 dtex or more.

本発明の長繊維不織布としてPPS樹脂を使用する場合、スパンボンド法で紡糸シート化させたシートを熱処理して、耐熱熱可塑性樹脂を結晶化させる結晶化工程を実施することが好ましい。熱処理による結晶化工程を実施することにより、高いシート強度と、優れた熱収縮特性が得れるからである。 When a PPS resin is used as the long-fiber nonwoven fabric of the present invention, it is preferable to carry out a crystallization step of crystallizing the heat-resistant thermoplastic resin by heat-treating the sheet spun by the spunbond method. It is because high sheet strength and excellent heat shrinkage characteristics can be obtained by performing the crystallization process by heat treatment.

PPSシートを結晶化するための熱処理温度は160〜250℃であるのが好ましい、より好ましくは180〜220℃である。PPSの場合、160℃未満では結晶化が不十分になる傾向があり、250℃を超えると、補外溶解開始温度(樹脂が溶け始める温度)に近くなり、PPSの形態が変化しはじめ、不織布(クリーニングシート)におけるPPSの状態が変わってしまう。この結晶化工程における熱処理は、熱可塑性樹脂が直線状又は曲線状に連続した皮膜を形成しないように、どの段階で実施する場合にも、無圧下で実施するのが好ましい。
また熱処理時にテンターによる形状保持してもよい。
The heat treatment temperature for crystallizing the PPS sheet is preferably 160 to 250 ° C, more preferably 180 to 220 ° C. In the case of PPS, crystallization tends to be insufficient at a temperature lower than 160 ° C., and when it exceeds 250 ° C., it approaches the extrapolated dissolution start temperature (the temperature at which the resin starts to melt), and the PPS form begins to change. The state of the PPS in the (cleaning sheet) changes. The heat treatment in this crystallization step is preferably carried out under no pressure in any stage so that the thermoplastic resin does not form a linear or curved continuous film.
Moreover, you may hold | maintain the shape by a tenter at the time of heat processing.

このようにして本発明の不織布(クリーニングシート)を製造できるが、厚さのバラツキがある場合がある。また、引張り強さが所望範囲内にない場合がある。そのような場合には、熱可塑性樹脂繊維の軟化温度よりも低い温度(好ましくは20℃以上低い温度)でカレンダー処理(カレンダー工程)を行って、前記問題点を解決するのが好ましい。なお、カレンダー工程における圧力は、厚さのバラツキの程度、所望見掛密度、所望引張り強さ、所望引裂強度等によって異なるため特に限定するものではない。この圧力は、実験を繰り返すことによって、適宜設定することができる。
なお、オイルを含有するクリーニングシートは、上述のような方法で製造した不織布をオイル中に浸漬したり、不織布にオイルをスプレー又はコーティングして製造することができる。
本発明品によって使用されたコピー用のクリーニングロールは使用後シリコンオイルを分離してPPS樹脂を再ペレット化して成型品用に使用することができる。
In this way, the nonwoven fabric (cleaning sheet) of the present invention can be produced, but there may be variations in thickness. Also, the tensile strength may not be within the desired range. In such a case, it is preferable to perform the calendar process (calendar process) at a temperature lower than the softening temperature of the thermoplastic resin fibers (preferably a temperature lower by 20 ° C. or more) to solve the above problems. The pressure in the calendar process is not particularly limited because it varies depending on the degree of thickness variation, desired apparent density, desired tensile strength, desired tear strength, and the like. This pressure can be appropriately set by repeating the experiment.
In addition, the cleaning sheet containing oil can be manufactured by immersing the nonwoven fabric manufactured by the above-mentioned method in oil, or spraying or coating the nonwoven fabric with oil.
The cleaning roll for copying used by the product of the present invention can be used for a molded product by separating the silicone oil after use and re-pelletizing the PPS resin.

以下実施例により、本発明を具体的に説明する。しかしながら本発明はこれによって限定されるものではない。なお以下の実施例などの評価および特性値は、以下の測定法によった。 The present invention will be specifically described below with reference to examples. However, the present invention is not limited thereby. The evaluation and characteristic values of the following examples and the like were based on the following measuring methods.

・ 目付(g/m2)
サンプルサイズ 5cm巾×20cm 縦方向5点、横方向5点 計10点で行った平均値。
・ Weight per unit (g / m2)
Sample size 5 cm wide × 20 cm Average value of 5 points in the vertical direction and 5 points in the horizontal direction, a total of 10 points.

(2)厚さ(mm)
幅方向に20cm置きにシックネスゲージ(荷重20g/cm2 面積 4cm2)で測定する。幅方向の10点の数の平均値。
(2) Thickness (mm)
Measure with a thickness gauge (load 20 g / cm 2 area 4 cm 2) every 20 cm in the width direction. Average value of the number of 10 points in the width direction.

・ 引張強度(N/5cm)
JISL1906に準じて、テンシロン機を用いてチャック間距離10cm、ヘッドスピード20cm/minで評価した。
・ Tensile strength (N / 5cm)
According to JISL1906, evaluation was performed using a Tensilon machine at a distance between chucks of 10 cm and a head speed of 20 cm / min.

(4)熱収縮率(%)
JISL1906に準じて、200℃×1時間熱処理後の収縮率を算出する。
(4) Thermal contraction rate (%)
In accordance with JISL1906, the shrinkage after heat treatment at 200 ° C. for 1 hour is calculated.

(5)融点(℃)
JISK7121に準じて、示差熱分析により得られる示差熱分析曲線から得る。
(5) Melting point (° C)
It is obtained from a differential thermal analysis curve obtained by differential thermal analysis according to JISK7121.

(6)払拭性の評価
カラー製複写機(リコー製、imagio Neo 352)を用意し、このカラー複写機のクリーニング装置を取り除いた状態で、全面黒色画像の複写を連続して20枚行った。次いで、実施例のクリーニングシートの一端からシャフトに巻回されたクリーニングシート供給体を備えたクリーニング装置(発泡シリコーンゴムからなる円柱状の棒状体と定着ロールとの挟み幅:3mm)を前記のモノクロ複写機に設置した。その後、全面白色画像の複写を連続して3枚行い、3枚目の複写紙表面におけるトナーによる汚れを観察した。
観察結果
○ :トナーによる汚れが全くなく、良好
△ :トナーによる汚れ少し見られる。
×:トナーによる汚れ多く見られる。
(6) Evaluation of wiping property A color copying machine (Ricoh's imageio Neo 352) was prepared, and the entire black image was copied 20 times with the cleaning device of the color copying machine removed. Next, a cleaning device (a sandwich width between a cylindrical rod-shaped body made of foamed silicone rubber and a fixing roll: 3 mm) provided with a cleaning sheet supply body wound around a shaft from one end of the cleaning sheet of the example is used as the above-described monochrome. Installed in a copier. Thereafter, three copies of the whole white image were continuously made, and the stain on the surface of the third copy paper was observed by toner.
Observation result ○: No contamination by toner, good Δ: Some contamination by toner is seen.
X: Many stains due to toner are observed.

(実施例1)
MFR122g/min.であるPPS樹脂を紡糸温度300℃にて、オリフィス径φ0.23mmのノズルより、単孔吐出量1.2g/minで紡糸し、ノズル下65mmより20℃の空気を風速0.3m/秒にて冷却しつつ、ノズル下800mmの地点に設置したエジェクターで糸速3800m/minの速度で吸引させつつ引取り、ノズル下1500mm点で、50m/分の速度で移動している引取ネット面へ繊維束を開繊させつつ振り落とし積層した。ネット面に積層した不織布は 90℃で線圧6kg/cmのカレンダローラーにて加工され長繊維不織布を得た。得られた長繊維不織布の融点は285℃であった。
上記得られた基材をテンター熱処理機によって200℃で処理した後、22%の面積率を有するエンボスロールによって温度250℃、線圧40kg/cmで部分熱圧着した耐熱長繊維不織布を得た。
(Example 1)
A PPS resin having an MFR of 122 g / min. Was spun at a spinning temperature of 300 ° C. from a nozzle with an orifice diameter of 0.23 mm at a single hole discharge rate of 1.2 g / min. Taking up while cooling at 3 m / sec, picking up with an ejector installed at a point 800 mm below the nozzle while sucking at a yarn speed of 3800 m / min, and taking up moving at a speed of 50 m / min at a point 1500 mm below the nozzle The fiber bundle was spun off and laminated on the net surface. The nonwoven fabric laminated on the net surface was processed with a calendar roller at 90 ° C. and a linear pressure of 6 kg / cm to obtain a long fiber nonwoven fabric. The melting point of the obtained long fiber nonwoven fabric was 285 ° C.
After processing the obtained base material at 200 ° C. with a tenter heat treatment machine, a heat-resistant long-fiber non-woven fabric subjected to partial thermocompression bonding with an embossing roll having an area ratio of 22% at a temperature of 250 ° C. and a linear pressure of 40 kg / cm was obtained.

(実施例2)
熱処理した後、100%の面積率を有するカレンダロールにより温度250℃、線圧80kg/cmで熱圧着した他、実施例1同様に実施し耐熱長繊維不織布を得た。
(Example 2)
After heat treatment, a heat-resistant long fiber nonwoven fabric was obtained in the same manner as in Example 1 except that it was thermocompression bonded with a calender roll having an area ratio of 100% at a temperature of 250 ° C. and a linear pressure of 80 kg / cm.

(比較例1)
固有粘度0.63であるPET樹脂を紡糸温度280℃にて紡糸した他、実施例1同様に実施し得られた長繊維不織布の融点は258℃であった。
(Comparative Example 1)
In addition to spinning a PET resin having an intrinsic viscosity of 0.63 at a spinning temperature of 280 ° C., the long-fiber nonwoven fabric obtained in the same manner as in Example 1 had a melting point of 258 ° C.

(比較例2)
熱処理した後、エンボスロールによる加工を施さない他、実施例1と同様に実施し耐熱長繊維不織布を得た。
(Comparative Example 2)
After heat treatment, a heat resistant long fiber nonwoven fabric was obtained in the same manner as in Example 1 except that the embossing roll was not used.

(比較例3)
パラ系全芳香族ポリアミドからなるフィブリルを有する耐熱性繊維(製品名:トワロン1094、帝人製、炭化温度:500℃以上)、及びポリエチレンテレフタレートからなる、繊度0.11dtex、繊維長3mmのポリエステル繊維(融点:260℃)を用意した。
次いで、前記耐熱性繊維をリファイナーによりフィブリル化を促進させた耐熱性繊維とポリエステル繊維とを70:30の質量比率で分散させたスラリーを形成した。その後、順流円網、傾斜ワイヤー型短網、順流円網、及びヤンキードライヤーを備えた抄紙機に、前記スラリーを各網へ供給し、それぞれ湿潤繊維ウエブを形成し、それぞれの湿潤繊維ウエブを積層した積層湿潤繊維ウエブを形成し、続いて、この積層湿潤繊維ウエブを温度120℃に設定したヤンキードライヤーにより乾燥して、繊維配向が一方向、ランダム、一方向の三層湿式繊維ウエブを形成した。
次いで、温度490℃に設定した遠赤外線セラミックヒータ(Ryoka製)を、上下に備えた遠赤外線照射装置の遠赤外線セラミックヒータ間を、速度15m/min.で前記三層湿式繊維ウエブを通過させることにより、ポリエステル繊維を溶融させて繊維形態を消滅させるとともに、溶融したポリエステル樹脂を耐熱性繊維の交点に凝集させた。なお、いずれの遠赤外線セラミックヒータとも110mm離間させた状態で前記三層湿式繊維ウエブを通過させた。また、移動する三層湿式繊維ウエブに対して、温度150℃の熱風を吹き付けた。
次いで、無圧下、室温で空冷して、凝集したポリエステル樹脂を凝固させて、凝固不織布を製造した。
その後、前記凝固不織布を、温度220℃に加熱したドライヤー内を5秒間かけて通過させ、ポリエステル樹脂を結晶化させ、結晶化不織布、つまりクリーニングシートを製造した。
以下、実施例1〜2、比較例1〜3での特性表を記す。
(Comparative Example 3)
Heat-resistant fiber having fibrils made of para-type wholly aromatic polyamide (product name: Twaron 1094, manufactured by Teijin, carbonization temperature: 500 ° C. or more), and polyester fiber having a fineness of 0.11 dtex and a fiber length of 3 mm made of polyethylene terephthalate ( Melting point: 260 ° C.).
Next, a slurry was formed in which the heat-resistant fiber in which fibrillation was promoted by a refiner and the polyester fiber were dispersed at a mass ratio of 70:30. Thereafter, the slurry is supplied to each net to a paper machine equipped with a forward flow net, an inclined wire type short net, a forward flow net, and a Yankee dryer, and each wet fiber web is formed, and each wet fiber web is laminated. The laminated wet fiber web was formed, and then the laminated wet fiber web was dried by a Yankee dryer set at a temperature of 120 ° C. to form a three-layer wet fiber web in which the fiber orientation was unidirectional, random, and unidirectional. .
Next, a far-infrared ceramic heater (manufactured by Ryoka) set at a temperature of 490 ° C. and a distance of 15 m / min. The polyester fiber was melted by passing through the three-layer wet fiber web to eliminate the fiber form, and the melted polyester resin was aggregated at the intersection of the heat-resistant fibers. Note that the three-layer wet fiber web was passed through the far-infrared ceramic heater with a distance of 110 mm. Further, hot air having a temperature of 150 ° C. was blown onto the moving three-layer wet fiber web.
Subsequently, it was air-cooled at room temperature under no pressure to coagulate the agglomerated polyester resin to produce a coagulated nonwoven fabric.
Thereafter, the coagulated nonwoven fabric was passed through a dryer heated to a temperature of 220 ° C. for 5 seconds to crystallize the polyester resin, thereby producing a crystallized nonwoven fabric, that is, a cleaning sheet.
Hereinafter, the characteristic table in Examples 1-2 and Comparative Examples 1-3 is described.

Figure 2008031600
Figure 2008031600

本発明によれば、従来の耐熱短繊維不織布と比較して、熱収縮性に優れ、強度が高く、リントフリー性に優れ、リサイクル性に優れた耐熱性長繊維不織布を供給することができる。リサイクルされた耐熱性樹脂は成型品用に使用され産業界に大きく寄与することができる。またPPS樹脂のリサイクルによる再利用によってコピークリーニングロールにおけるゼロエミッション化が実現できる。   According to the present invention, it is possible to supply a heat-resistant long fiber nonwoven fabric excellent in heat shrinkability, high in strength, excellent in lint-free properties, and excellent in recyclability as compared with conventional heat-resistant short fiber nonwoven fabrics. Recycled heat-resistant resin is used for molded products and can greatly contribute to the industry. Also, zero emission in the copy cleaning roll can be realized by reusing the PPS resin by recycling.

Claims (3)

融点が260℃以上、縦強度が50N/5cm以上、200℃1時間熱処理したときの乾熱収縮率1.5%以下であることを特徴する耐熱長繊維不織布。 A heat-resistant long fiber nonwoven fabric having a melting point of 260 ° C. or higher, a longitudinal strength of 50 N / 5 cm or higher, and a dry heat shrinkage of 1.5% or less when heat-treated at 200 ° C. for 1 hour. 使用する耐熱熱可塑性樹脂がポリフェニレンサルファイドであることを特徴とする請求項1記載の耐熱長繊維不織布。 The heat-resistant long-fiber nonwoven fabric according to claim 1, wherein the heat-resistant thermoplastic resin used is polyphenylene sulfide. 請求項1又は2記載の耐熱長繊維不織布からなることを特徴とするコピー機用のクリーニングシート。 A cleaning sheet for a copying machine, comprising the heat-resistant long fiber nonwoven fabric according to claim 1.
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