JP2907418B2 - Composite fiber for screen gauze and screen gauze - Google Patents
Composite fiber for screen gauze and screen gauzeInfo
- Publication number
- JP2907418B2 JP2907418B2 JP7067713A JP6771395A JP2907418B2 JP 2907418 B2 JP2907418 B2 JP 2907418B2 JP 7067713 A JP7067713 A JP 7067713A JP 6771395 A JP6771395 A JP 6771395A JP 2907418 B2 JP2907418 B2 JP 2907418B2
- Authority
- JP
- Japan
- Prior art keywords
- polymer
- component
- sheath
- screen gauze
- strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Multicomponent Fibers (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Woven Fabrics (AREA)
- Artificial Filaments (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、製織性が良好で高強力
を有し、かつ耐久性、寸法安定性に優れたスクリ−ン紗
用複合繊維及びスクリ−ン紗に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen gauze composite fiber and a screen girder having good weaving properties, high tenacity, and excellent durability and dimensional stability.
【0002】[0002]
【従来の技術】スクリ−ン紗による高密度・高精度印刷
を実現するためには、ハイテンション紗張りが可能であ
ること、寸法変化が小さいこと、弾性回復力が大きいこ
とが要求される。ナイロン、ポリエステル等の屈曲性高
分子からなる繊維を用いたスクリ−ン紗が広く使用され
ているが、かかるスクリ−ン紗は強度・弾性率がともに
低く、寸法安定性も必ずしも良いものではなかった。以
上のことから、高強度高弾性率を有する溶融異方性ポリ
エステルを用いたスクリ−ン紗が、特開平2−8064
0号公報、特開平3−220340号公報に提案されて
いる。2. Description of the Related Art In order to realize high-density and high-precision printing using a screen gauze, it is required that high tension gauging can be performed, dimensional change is small, and elastic recovery force is large. Screen gauze using fibers made of flexible polymers such as nylon and polyester is widely used, but such screen gauze has low strength and elastic modulus and does not always have good dimensional stability. Was. From the above, a screen gauze using a melt anisotropic polyester having a high strength and a high elastic modulus is disclosed in JP-A-2-8064.
No. 0, and Japanese Patent Application Laid-Open No. 3-220340.
【0003】[0003]
【発明が解決しようとする課題】溶融異方性ポリエステ
ル繊維のみからなるスクリ−ン紗は強度・弾性率の点で
は問題がないものの、剛直性ポリマ−であるため表面が
フィブリル化しやすく、製織工程で発生したフィブリル
がインキの透過性を阻害し、高精度印刷を妨げるため実
用に付すことができなかった。また、溶融異方性ポリエ
ステルを島成分、ポリエチレンテレフタレ−トを海成分
とする海島繊維を用いることも提案されているが、かか
る繊維の強度は12g/d程度であり、強度等の機械的
性能の点で満足できるものではなかった。さらに、特開
平3−220340号公報には、溶融異方性ポリエステ
ルを芯成分、屈曲性ポリマ−を鞘成分とする芯鞘型複合
繊維を用いたスクリ−ン紗が提示されているが、かかる
繊維の強度を高めるためには鞘成分の割合を極力低くす
る必要があり、製造時の偏芯による芯の露出等が生じて
操業規模での生産は極めて困難であった。また、鞘成分
の屈曲性ポリマ−が延伸されていない(配向結晶化され
ていない)ため、非常に脆く、鞘の剥離や脱落等が生じ
やすい問題があった。The screen gauze made of only the melt-anisotropic polyester fiber has no problem in strength and elastic modulus, however, since it is a rigid polymer, the surface is easily fibrillated, and the weaving process is performed. The fibrils generated in step (1) hindered the permeability of the ink and hindered high-precision printing, and thus could not be put to practical use. It has also been proposed to use sea-island fibers having melt anisotropic polyester as an island component and polyethylene terephthalate as a sea component, but the strength of such fibers is about 12 g / d, It was not satisfactory in terms of performance. Further, JP-A-3-220340 discloses a screen gauze using a core-sheath type conjugate fiber having a melt anisotropic polyester as a core component and a flexible polymer as a sheath component. In order to increase the strength of the fiber, it is necessary to reduce the ratio of the sheath component as much as possible, and the eccentricity at the time of production causes exposure of the core, and production on an operation scale was extremely difficult. In addition, since the flexible polymer of the sheath component is not stretched (not oriented and crystallized), it is very brittle, and there is a problem that the sheath is easily peeled or dropped.
【0004】本発明は、高強力高弾性率を有するととも
に、芯と鞘が剥離しにくく耐フィブリル性に優れたスク
リ−ン紗用複合繊維及びスクリ−ン紗を提供するもので
ある。The present invention provides a composite fiber for a screen gauze and a screen girder having a high strength and a high modulus of elasticity, and a core and a sheath which are hardly peeled off and have excellent fibril resistance.
【0005】[0005]
【課題を解決する手段】本発明は、芯成分(Aポリマ
ー)が溶融異方性芳香族ポリエステルであり、鞘成分が
屈曲性熱可塑性高分子からなる海成分(Bポリマー)と
溶融異方性芳香族ポリエステルからなる島成分(Cポリ
マー)により構成され、鞘成分比0.30〜0.60、
島成分比0.25〜0.5、引張強度が15g/d以
上、弾性率400g/d以上、繊維径35μm以下であ
るスクリーン紗用複合モノフィラメント及びスクリーン
紗に関するものである。According to the present invention, the core component (A polymer) is a melt-anisotropic aromatic polyester, and the sheath component is a sea component (B polymer) composed of a flexible thermoplastic polymer. An island component (C polymer) composed of an aromatic polyester, and a sheath component ratio of 0.30 to 0.60 ;
The island component ratio is 0.25 to 0.5, the tensile strength is 15 g / d or more, the elastic modulus is 400 g / d or more , and the fiber diameter is 35 μm or less.
The present invention relates to a composite monofilament for screen gauze and a screen gauze.
【0006】本発明にいう溶融異方性とは、溶融相にお
いて光学的異方性(液晶性)を示すことである。例えば
試料をホットステ−ジにのせ、窒素雰囲気下で昇温加熱
し、試料の透過光を観察することにより認定できる。本
発明で用いる芳香族ポリエステルは、芳香族ジオ−ル、
芳香族ジカルボン酸、芳香族ヒドロキシカルボン酸等の
反復構成単位からなるが、下記化1に示す反復構成単位
の組み合わせからなるものが好ましい。[0006] The term "melt anisotropy" as used in the present invention refers to an optical anisotropy (liquid crystallinity) in a molten phase. For example, it can be recognized by placing the sample on a hot stage, heating and heating the sample in a nitrogen atmosphere, and observing the transmitted light of the sample. The aromatic polyester used in the present invention is an aromatic diol,
It is composed of a repeating structural unit such as an aromatic dicarboxylic acid or an aromatic hydroxycarboxylic acid, but is preferably composed of a combination of the repeating structural units represented by the following formula 1.
【0007】[0007]
【化1】 Embedded image
【0008】特に好ましくは、下記化2に示す反復構成
単位の組み合わせからなるポリマ−が好ましい。特に、
(A)及び(B)の反復構成単位からなる部分が65重量
%以上であるポリマ−であり、特に(B)の成分が4〜
45重量%である芳香族ポリエステルが好ましい。Particularly preferred is a polymer comprising a combination of repeating structural units represented by the following formula (2). Especially,
(A) and (B) is a polymer in which the portion composed of the repeating constitutional units is 65% by weight or more.
An aromatic polyester which is 45% by weight is preferred.
【0009】[0009]
【化2】 Embedded image
【0010】好ましい溶融異方性ポリエステルの融点
(MP)は、260 〜360 ℃、より好ましくは270 〜350
℃である。ここでいう融点とは、示差走査熱量(DS
C:例えばmettler 社製、TA3000)で観察される主吸
熱ピ−クのピ−ク温度である(JIS K7121)。具体
的には、DSC(例えばMettler 社製 TA3000)
装置に、サンプルを10〜20mgをとりアルミ製パンへ封入
した後、キャリア−ガスとして窒素を100cc/分流し、2
0℃/分で昇温したときの吸熱ピ−クを測定する。ポリ
マ−の種類により上記1st Runで明確な吸熱ピ−クが現
れない場合は、50℃/分の昇温速度で予想される流れ
温度よりも50℃高い温度まで昇温し、その温度で3分
間完全に溶融した後、80℃/分の速度で50℃まで冷
却し、しかる後に20℃/分の昇温速度で吸熱ピ−クを
測定するとよい。The preferred melting anisotropic polyester has a melting point (MP) of 260 to 360 ° C., more preferably 270 to 350 ° C.
° C. The melting point referred to here is the differential scanning calorific value (DS
C: Peak temperature of the main endothermic peak observed with, for example, TA3000 manufactured by Mettler (JIS K7121). Specifically, DSC (for example, TA3000 manufactured by Mettler)
After taking 10 to 20 mg of the sample and sealing it in an aluminum pan, 100 cc / minute of nitrogen was flowed as a carrier gas into the apparatus.
The endothermic peak when the temperature is raised at 0 ° C./min is measured. If a clear endothermic peak does not appear in the first run depending on the type of the polymer, the temperature is raised to a temperature 50 ° C. higher than the expected flow temperature at a temperature rising rate of 50 ° C./min. After melting completely for one minute, it is preferable to cool to 50 ° C. at a rate of 80 ° C./min and then measure the endothermic peak at a rate of temperature rise of 20 ° C./min.
【0011】本発明でAポリマ−として用いる溶融異方
性芳香族ポリエステルには、本発明の効果を損なわない
範囲で、ポリエチレンテレフタレ−ト、変性ポリエチレ
ンテレフタレ−ト、ポリオレフィン、ポリカ−ボネ−
ト、ポリアリレ−ト、ポリアミド、ポリフェニレンサル
ファイド、ポリエ−テルエステルケトン、フッ素樹脂熱
可塑性ポリマ−を添加しても良い。また酸化チタン、カ
オリン、シリカ、酸化バリウム等の無機物、カ−ボンブ
ラック、染料や顔料等の着色剤、酸化防止剤、紫外線吸
収剤、光安定剤等の各種添加剤を含んでいても良い。The melt-anisotropic aromatic polyester used as the A polymer in the present invention includes polyethylene terephthalate, modified polyethylene terephthalate, polyolefin and polycarbonate within a range not to impair the effects of the present invention.
, Polyarylate, polyamide, polyphenylene sulfide, polyetheresterketone, and fluororesin thermoplastic polymer may be added. It may also contain various additives such as inorganic substances such as titanium oxide, kaolin, silica and barium oxide, carbon black, coloring agents such as dyes and pigments, antioxidants, ultraviolet absorbers and light stabilizers.
【0012】海成分(Bポリマ−)としては、屈曲性熱
可塑性高分子であれば特に限定されるものではなく、ポ
リオレフィン、ポリアミド、ポリエステル、ポリアリレ
−ト、ポリカ−ボネ−ト、ポリフェニレンサルファイ
ド、ポリエステルエ−テルケトン、フッ素樹脂等が挙げ
られる。特に好ましくは、ポリフェニレンサルファイド
(PPS)、ポリエチレンナフタレ−ト及び下記化3で
表される半芳香族ポリエステルアミドである。屈曲性熱
可塑性高分子を海成分として用いることにより、耐フィ
ブリル性、耐摩耗性は大きく改善される。なお、本発明
にいう屈曲性高分子とは、主鎖上に芳香環を有さないポ
リマ−及び主鎖上に芳香環を有し、かつ芳香環間の主鎖
上に原子が4個以上存在するポリマ−をいう。The sea component (B polymer) is not particularly limited as long as it is a flexible thermoplastic polymer. Polyolefin, polyamide, polyester, polyarylate, polycarbonate, polyphenylene sulfide, polyester Ether ketone, fluororesin and the like can be mentioned. Particularly preferred are polyphenylene sulfide (PPS), polyethylene naphthalate and semi-aromatic polyester amide represented by the following formula (3). By using a flexible thermoplastic polymer as a sea component, fibril resistance and abrasion resistance are greatly improved. In addition, the flexible polymer referred to in the present invention is a polymer having no aromatic ring on the main chain and having an aromatic ring on the main chain, and having four or more atoms on the main chain between the aromatic rings. Refers to existing polymers.
【0013】[0013]
【化3】 Embedded image
【0014】Cポリマ−は、Aポリマ−と同様の溶融異
方性芳香族ポリエステルを用いることができ、Aポリマ
−とCポリマ−は同種であっても異種であっても良い。
好ましくは、Bポリマ−の融点(MP)+80℃以下、
MP−10℃以上のポリマ−が好ましい。As the C polymer, the same melt anisotropic aromatic polyester as the A polymer can be used, and the A polymer and the C polymer may be the same or different.
Preferably, the melting point (MP) of the B polymer is + 80 ° C. or less,
Polymers having an MP of at least 10 ° C. are preferred.
【0015】本発明の複合繊維における鞘成分比は0.
3〜0.6とする。通常の芯鞘型複合繊維の場合、鞘成
分は強度に殆ど寄与しないため、高強力繊維を得るため
には、鞘成分比を小さくせざるを得なかった。そのた
め、摩耗や製織工程通過時に鞘成分が剥離したり、芯成
分が露出してフィブリル化などが生じてトラブルの原因
となっていた。本発明によれば、鞘成分も強力向上に寄
与するため、鞘成分比率を高くした場合においても、強
度15g/d以上の優れた複合繊維を得ることがでい
る。鞘成分比が0.25未満では芯が露出しやすく、
0.75を越えると強力の点で不十分となる。なお、本
発明にいう鞘成分比とは、複合繊維の断面積比A/(A
+B+C)を示す。断面積比は、繊維横断面の顕微鏡写
真から求められるが、製造時の芯成分と鞘成分の吐出量
の体積比により求めることもできる。The sheath component ratio in the composite fiber of the present invention is 0.1.
3 to 0.6. In the case of ordinary core-sheath type composite fibers, the sheath component hardly contributes to the strength, so that in order to obtain a high-strength fiber, the sheath component ratio has to be reduced. For this reason, the sheath component was peeled off during abrasion or the weaving process, or the core component was exposed to cause fibrillation, which was a cause of trouble. According to the present invention, since the sheath component also contributes to the improvement in the strength, even when the sheath component ratio is increased, it is possible to obtain an excellent composite fiber having a strength of 15 g / d or more. When the sheath component ratio is less than 0.25, the core is easily exposed,
If it exceeds 0.75, the strength will be insufficient. In addition, the sheath component ratio referred to in the present invention refers to the cross-sectional area ratio A / (A
+ B + C). The cross-sectional area ratio can be determined from a micrograph of the cross-section of the fiber, but can also be determined from the volume ratio of the discharge amount of the core component and the sheath component during production.
【0016】溶融異方性ポリエステル繊維は延伸を行う
ことなく優れた性能が得られるが、屈曲性高分子からな
る未延伸糸は未配向状態であるため物性が著しく劣り、
強度等が極めて低いものであった。さらに屈曲性高分子
は溶融異方性ポリエステルとの接着性が低く、剥離しや
すい問題がある。以上のことから、本発明は、鞘成分を
溶融異方性ポリエステルと屈曲性高分子からなるブレン
ド(海島成分)で構成することにより、鞘成分の強力を
高めると同時に芯成分との接着性を高めようとするもの
である。本発明の芯鞘型複合繊維の鞘成分は海島構造を
有するものである。海島構造とは、繊維横断面におい
て、マトリックスとなる海成分の中に数十から数百の島
が存在している状態を意味する。Bポリマ−及びCポリ
マ−の混合比、溶融粘度等を変えることにより島数を調
整することができる。Bポリマ−とCポリマ−をチップ
ブレンドする、または両成分の溶融物をスタチックミキ
サ−等で混合することにより得られる。[0016] The melt-anisotropic polyester fiber can provide excellent performance without drawing, but the undrawn yarn made of a flexible polymer is in an unoriented state, and its physical properties are extremely poor.
The strength and the like were extremely low. Further, the flexible polymer has a problem that it has low adhesion to the melt anisotropic polyester and is easily peeled off. In view of the above, the present invention increases the strength of the sheath component and simultaneously improves the adhesiveness with the core component by configuring the sheath component with a blend (sea-island component) composed of a melt-anisotropic polyester and a flexible polymer. It is to try to raise it. The sheath component of the core-sheath conjugate fiber of the present invention has a sea-island structure. The sea-island structure means a state in which tens to hundreds of islands are present in a sea component serving as a matrix in a fiber cross section. The number of islands can be adjusted by changing the mixing ratio, melt viscosity, and the like of the B polymer and the C polymer. It is obtained by chip blending the B polymer and the C polymer, or by mixing a melt of both components with a static mixer or the like.
【0017】鞘成分中の島成分比は、製造された鞘型複
合繊維の横断面積比C/(B+C)において0.25〜
0.5である必要がある。0.25未満の場合には、強
力の点で不十分の場合があり、0.5を越えると溶融異
方性ポリエステル(C)が繊維表面に露出しやすくなる
ため耐フィブリル性が不十分となる場合があり、さらに
島成分と海成分が逆転する場合が生じる。島成分比は、
繊維横断面の顕微鏡写真から求められるが、製造時の芯
成分と鞘成分の吐出量の体積比により求めることもでき
る。島成分の直径は0.1〜2μm程度とするのが好ま
しい。The island component ratio in the sheath component is 0.25 to 0.25 in the cross-sectional area ratio C / (B + C) of the produced sheath-type composite fiber.
It must be 0.5. If it is less than 0.25, the strength may be insufficient. If it exceeds 0.5, the fibril resistance may be insufficient because the melt anisotropic polyester (C) is easily exposed on the fiber surface. In some cases, the island component and the sea component are reversed. The island component ratio is
It can be determined from the micrograph of the cross section of the fiber, but can also be determined from the volume ratio of the discharge amount of the core component and the sheath component during production. The diameter of the island component is preferably about 0.1 to 2 μm.
【0018】本発明の複合繊維は、公知の方法、例えば
図1に示されるノズルを用いて紡糸することができる。
得られる繊維の横断面形状は特に限定されるものではな
いが、例えば図2のような形状が好ましい例として挙げ
られる。The conjugate fiber of the present invention can be spun by a known method, for example, using a nozzle shown in FIG.
Although the cross-sectional shape of the obtained fiber is not particularly limited, for example, a shape as shown in FIG. 2 is a preferred example.
【0019】また、本発明においては、好ましくはBポ
リマ−及び/又はCポリマ−に着色剤を含有させること
ができる。着色剤は海成分及び島成分の両方に含まれて
いても、どちらか一方に含まれていても良く、含有率が
2成分で異なっていても良い。好ましくは、各ポリマ−
重量の0.1 〜2重量%に相当する着色剤を含有させる。
0.1 重量%未満では着色の効果が不十分である場合が生
じることもあり、2重量%をこえると増粘効果と濾過性
不良となる場合がある。Cポリマ−にCポリマ−重量に
対して0.1 〜2重量%に相当する着色剤を含有させるの
が、摩耗による脱落が生じにくい点で好ましい。In the present invention, preferably, a colorant can be contained in the B polymer and / or the C polymer. The coloring agent may be contained in both the sea component and the island component, or may be contained in either one, and the content may be different between the two components. Preferably, each polymer
The coloring agent is contained in an amount of 0.1 to 2% by weight.
If the amount is less than 0.1% by weight, the coloring effect may be insufficient. If the amount is more than 2% by weight, the thickening effect and poor filterability may be caused. It is preferable that the C polymer contains a coloring agent equivalent to 0.1 to 2% by weight based on the weight of the C polymer, because the coloring agent hardly falls off due to abrasion.
【0020】着色剤としては、カ−ボンブラック、顔料
(酸化チタン等を含む)、耐熱性を有する染料を用いる
ことができ、好ましくは、粒径が10〜1000mμの
ものを用いる。着色剤の混合方法は、直接Bポリマ−及
び/又はCポリマ−に所定量を添加しても良いし、高濃
度のマスタ−チップを繊維製造時にブレンド法で希釈し
ても良い。また、Bポリマ−及びCポリマ−には、本発
明の効果を損なわない程度に、他のポリマ−や各種添加
剤を含んでいても良い。As the coloring agent, carbon black, pigments (including titanium oxide, etc.) and dyes having heat resistance can be used, and those having a particle size of 10 to 1000 μm are preferably used. As a method of mixing the colorant, a predetermined amount may be directly added to the B polymer and / or the C polymer, or a high-concentration master chip may be diluted by a blending method at the time of fiber production. Further, the B polymer and the C polymer may contain other polymers and various additives to the extent that the effects of the present invention are not impaired.
【0021】本発明の複合繊維は、紡糸しただけで既に
十分な強度、弾性率を有しているが弛緩熱処理あるいは
緊張熱処理により性能を更に向上させることができる。
熱処理は、窒素等の不活性ガス雰囲気下や、空気の如き
酸素含有の活性ガス雰囲気中または減圧下で行うことが
可能である。熱処理雰囲気は露点が−80℃以下の低湿
気体が好ましい。好ましい熱処理条件としては、芯成分
の融点−40℃以下から鞘成分ポリマ−の融点以下まで
順次昇温していく温度パタ−ンが挙げられる。処理時間
は目的により数分から数十時間行う。The composite fiber of the present invention already has sufficient strength and elastic modulus only by spinning, but its performance can be further improved by relaxation heat treatment or strain heat treatment.
The heat treatment can be performed in an inert gas atmosphere such as nitrogen, an oxygen-containing active gas atmosphere such as air, or under reduced pressure. The heat treatment atmosphere is preferably a low humidity gas having a dew point of -80 ° C or less. Preferred heat treatment conditions include a temperature pattern in which the temperature is gradually increased from the melting point of the core component of -40 ° C or lower to the melting point of the sheath component polymer or lower. The processing time is several minutes to several tens hours depending on the purpose.
【0022】熱の供給は、気体等の媒体を用いる方法、
加熱板、赤外線ヒ−タ−等により輻射を利用する方法、
熱ロ−ラ−、熱プレ−ト等に接触して行う方法、高周波
等を利用した内部加熱方法等がある。処理は、目的によ
り緊張下あるいは無緊張下で行われる。処理形状はカセ
状、トウ状(例えば金属網等にのせて行う)、あるいは
ロ−ラ−間で連続的に処理することも可能である。緊張
熱処理は、芯成分の融点−80℃以下の温度で、切断強
度の1〜10%の張力をかけて行うのが好ましく、この
処理により様々な性能、特に弾性率は一層改善される。The heat is supplied by a method using a medium such as a gas,
A method using radiation by a heating plate, an infrared heater, or the like,
There are a method of contacting with a heat roller, a heat plate, or the like, and an internal heating method using high frequency or the like. The treatment is performed under tension or without tension depending on the purpose. The shape of the treatment may be a scallop shape, a tow shape (for example, performed on a metal net or the like), or a continuous treatment between rollers. The tension heat treatment is preferably performed at a temperature not higher than the melting point of the core component −80 ° C. and applying a tension of 1 to 10% of the cutting strength, whereby various performances, particularly elastic modulus, are further improved.
【0023】本発明の芯鞘型複合繊維は、高強力高弾性
率でかつ耐フィブリル性に優れているため、紗張りテン
ションも高くでき、また弾性回復、寸法安定性も良好で
あるため、従来金属細線へ使用していた紗の用途への適
用も十分可能である。平均線径5〜70μm、特に平均
線径35μm以下のモノフィラメントとした場合に、本
発明の効果をより一層顕著に得られる。かかる繊維を用
いた350メッシュ以上の高密度スクリ−ンを、ポリエ
チレンテレフタレ−ト繊維等で製造した場合、製織工程
の僅かな異常張力で容易に切断したり、弾性率が小さい
ため張力により伸長する問題が生じる。従って、400
メッシュ以上の紗になるとステンレス細線が使用されて
いたが、ステンレス細線は弾性回復率が劣るため大型基
板には適さず、コスト高の原因となっていた。本発明の
複合繊維は、30μm程度で155g以上の高強力であ
るため、高密度スクリ−ンや大型基板の製造も可能であ
る。強度15g/d未満、弾性率400g/d未満の場
合には、400メッシュ以上の高密度スクリ−ンや大型
基板に供することが極めて困難となる。強度18g/d
以上、弾性率500g/d以上の繊維がより好ましい。
本発明の効果を損なわない範囲で他の繊維と混用した織
物等の布帛としても良い。本発明により得られたスクリ
−ン紗は、パタ−ン印刷、文字印刷、銘版印刷あるいは
カラ−印刷等のスクリ−ン印刷の分野で微細、かつ鮮明
な印刷を安定して行うことができる。The core-sheath type conjugate fiber of the present invention has a high strength and a high elastic modulus and is excellent in fibril resistance, so that it can have a high tension, and has good elastic recovery and dimensional stability. The application of gauze used for thin metal wires to applications is sufficiently possible. When the monofilament has an average wire diameter of 5 to 70 μm, particularly an average wire diameter of 35 μm or less, the effect of the present invention can be more remarkably obtained. When a high-density screen of 350 mesh or more using such fibers is made of polyethylene terephthalate fiber or the like, it is easily cut by a slight abnormal tension in the weaving process, or stretched by tension due to a small elastic modulus. Problems arise. Therefore, 400
Stainless steel wires were used for gauze of mesh size or more, but stainless steel wires were inadequate for large substrates due to poor elastic recovery, causing high cost. Since the composite fiber of the present invention has a high strength of about 155 g or more at about 30 μm, it is possible to produce a high-density screen and a large-sized substrate. When the strength is less than 15 g / d and the elastic modulus is less than 400 g / d, it becomes extremely difficult to provide a high-density screen of 400 mesh or more or a large substrate. Strength 18g / d
As described above, fibers having an elastic modulus of 500 g / d or more are more preferable.
A fabric such as a woven fabric mixed with other fibers may be used as long as the effects of the present invention are not impaired. The screen gauze obtained according to the present invention can stably perform fine and clear printing in the field of screen printing such as pattern printing, character printing, intaglio printing or color printing. .
【0024】[0024]
【実施例】以下、実施例により本発明を具体的に説明す
るが、本発明はこれにより何等限定されるものではな
い。 [溶融粘度 MV]300 ℃、剪断速度r=1000sec -1の
条件で東洋精機キャピログラフ1B型を用いて測定し
た。 [対数粘度ηinh ]試料をペンタフルオロフェノ−ルに
0.1 重量%溶解し(60〜80℃)、60℃の恒温槽中でウッ
ペロ−デ型粘度計を用いて相対粘度(ηrel)を測定し、
ηinh =ln(ηrel)/cにより算出した。なおcはポリ
マ−濃度(g/dl)である。 [強度]JIS L 1013に準じ、試長20cm、初
荷重0.1g/d、引張速度10cm/minの条件で破断強伸度を求
め、5点以上の平均値を採用した。 [線径変動%]ZIMMER社製の外径測定器M-4609A/2 を用
い、糸速20m/分で長さ100mのフィラメントの線
径を連続記録し、最大(max)と最小(min)及び
平均値(x)を測定し、下記式より求めた。 線径変動(%)=±((max−min)/2x)×100 線径変動が大きいほど、鞘成分の剥離、脱落が生じてい
ることとなる。 [ガイド摩耗]大栄科学機器社製の抱合力試験機を用
い、120度の角度を配置された3本の櫛ガイドに6本
のモノフィラメントを各々ガイドに通し、各フィラメン
トに1g/dの荷重を掛け、ストロ−ク長3cm、速度
95回/分で往復運動を与え、毛羽(剥離、フィブリル
化)の発生した回数を測定した。EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited thereto. [Melt viscosity MV] It was measured using Toyo Seiki Capillograph Model 1B under the conditions of 300 ° C. and shear rate r = 1000 sec −1 . [Logarithmic viscosity ηinh] Convert sample to pentafluorophenol
0.1% by weight was dissolved (60-80 ° C), and the relative viscosity (ηrel) was measured using an Upperod viscometer in a thermostat at 60 ° C.
ηinh = ln (ηrel) / c. Here, c is the polymer concentration (g / dl). [Strength] According to JIS L 1013, the elongation at break was determined under the conditions of a test length of 20 cm, an initial load of 0.1 g / d, and a tensile speed of 10 cm / min, and an average value of 5 points or more was adopted. [Line diameter variation%] Using an outer diameter measuring device M-4609A / 2 manufactured by ZIMMER, the wire diameter of a filament having a length of 100 m was continuously recorded at a yarn speed of 20 m / min, and the maximum (max) and minimum (min) were recorded. And the average value (x) was measured and determined by the following equation. Wire diameter variation (%) = ± ((max−min) / 2x) × 100 The larger the wire diameter variation, the more the sheath component is peeled or dropped. [Guide wear] Six monofilaments were passed through each of three comb guides arranged at an angle of 120 degrees using an embracing force tester manufactured by Daiei Scientific Instruments, and a load of 1 g / d was applied to each filament. A reciprocating motion was applied at a stroke length of 3 cm and a speed of 95 times / minute, and the number of fluffs (peeling, fibrillation) was measured.
【0025】<実施例1>Aポリマ−には、前記化2で
示した構成単位(A)と(B)が73/27 モル%である溶
融異方性芳香族ポリエステル(MP=281 ℃、MV=42
5poise、ηinh =4.38dl/g)を用いた。鞘成分として
は、Bポリマ−として直鎖ポリフェニレンサルファイド
(溶融粘土1100poise -1:温度300℃)、Cポリマ−
として上記Aポリマ−と同様の溶融異方性芳香族ポリエ
ステルを用い、島成分比0.33となるようにブレンド
した。芯成分と鞘成分を別々の押出機より溶融し、芯と
鞘の重量比2:1になるように、図1の構造を有する口
金より紡糸温度305 ℃、巻取速度680mm/分で紡糸した。
紡糸調子は良好で48/6fの繊維を得た。この紡糸原
糸を分繊して8dのモノフィラメントとし、250℃で
2時間、260℃で2時間、更に268℃で6時間窒素
ガス雰囲気中で熱処理した。得られた熱処理糸は、以下
の性能を有していた。<Example 1> A polymer was prepared from a melt-anisotropic aromatic polyester (MP = 281 ° C, 73/27 mol% of the structural units (A) and (B) represented by the above formula (2)). MV = 42
5poise, ηinh = 4.38dl / g). As the sheath component, linear polyphenylene sulfide (molten clay 1100 poise -1 : temperature 300 ° C.) as B polymer, C polymer
And the same melt-anisotropic aromatic polyester as the above-mentioned A polymer was used and blended so that the island component ratio was 0.33. The core component and the sheath component were melted from separate extruders and spun at a spinning temperature of 305 ° C. and a winding speed of 680 mm / min from a die having the structure of FIG. 1 so that the weight ratio of the core and the sheath was 2: 1. .
The spinning condition was good and a 48 / 6f fiber was obtained. This spun yarn was separated into 8d monofilaments, and heat-treated in a nitrogen gas atmosphere at 250 ° C. for 2 hours, 260 ° C. for 2 hours, and further at 268 ° C. for 6 hours. The resulting heat-treated yarn had the following performance.
【0026】 平均線径 :27 μm 引張強度(DT):20.2 g/d 引張伸度(DE): 3.1 % 弾性率 (YM):522g/d鞘 成分比 :0.33 このフィラメントを経糸及び緯糸に用いて平織物とし、
400メッシュのスクリーン紗を得た。製造工程での毛
羽やフィブリル化の発生はまったくなく、織目間隙の斑
の非常に少ない良好なものであった。Average wire diameter: 27 μm Tensile strength (DT): 20.2 g / d Tensile elongation (DE): 3.1% Elastic modulus (YM): 522 g / d Sheath component ratio: 0.33 This filament Is used for warp and weft to make plain fabric,
A screen mesh of 400 mesh was obtained. No fluff or fibrillation occurred during the production process, and the pattern was excellent with very little unevenness in the interstices.
【0027】<比較例1>鞘成分としてBポリマーのみ
を用いた以外は、実質的に実施例1と同様の方法で芯鞘
型複合繊維を得た。得られた熱処理糸の性能を示す。 平均線径 :27 μm 引張強度 (DT):14.1g/d 引張伸度 (DE): 2.8% 弾性率 (YM):420g/d鞘 成分比 :0.35 分繊工程で鞘の剥離が発生し、熱処理前のフィラメント
を顕微鏡観察すると小さい凹凸が多数存在していた。こ
のフィラメントから400メッシュのスクリーン紗を製
造したが、製織工程で鞘の剥離と脱落が生じ、得られた
スクリーン紗は実用に供し得るものではなかった。<Comparative Example 1> A core-in-sheath type composite fiber was obtained in substantially the same manner as in Example 1 except that only the B polymer was used as the sheath component. The performance of the obtained heat-treated yarn is shown. Average wire diameter: 27 μm Tensile strength (DT): 14.1 g / d Tensile elongation (DE): 2.8% Elastic modulus (YM): 420 g / d Sheath component ratio: 0.35 Peeling occurred and the filament before heat treatment was observed under a microscope. A 400-mesh screen gauze was manufactured from this filament, but the sheath was peeled off and dropped off during the weaving process, and the resulting screen gauze was not practical.
【0028】<実施例2、実施例3、比較例2、比較例
3>鞘成分比、島成分比を変更した以外は、実施例1と
同様に複合繊維を製造した。結果を表1に示す。<Example 2, Example 3, Comparative Example 2, Comparative Example 3> A conjugate fiber was produced in the same manner as in Example 1 except that the sheath component ratio and the island component ratio were changed. Table 1 shows the results.
【0029】[0029]
【表1】 [Table 1]
【0030】本発明の複合繊維は強度及び弾性率に優
れ、線径変動率も4%未満のものであり、鞘成分と芯成
分の剥離、脱落は実質的に生じていなかった。スクリ−
ン紗の製造工程も問題なく、性能の優れたものが得られ
た。一方、比較例2は強度、弾性率及び線径変動も良好
であるが、島成分比が大きく繊維表面に溶融異方性ポリ
エステルが多く露出しているため、ガイド摩耗による耐
フィブリル性の低いものであった。また、比較例3は鞘
成分比が大きいため繊維の強度は低いものが得られた。
かかる繊維を用いてスクリ−ン紗を製造したが、製織工
程で断糸トラブルが発生した。The conjugate fiber of the present invention was excellent in strength and elastic modulus, had a wire diameter variation of less than 4%, and did not substantially peel off or fall off the sheath component and the core component. Screen
There was no problem in the production process of the ginseng, and a product with excellent performance was obtained. On the other hand, Comparative Example 2 has good strength, elastic modulus, and variation in wire diameter, but has a large island component ratio and a large amount of melt-anisotropic polyester exposed on the fiber surface, and thus has low fibril resistance due to guide wear. Met. In Comparative Example 3, a fiber having a low strength was obtained because the sheath component ratio was large.
Screen gauze was manufactured using such fibers, but a yarn breakage problem occurred in the weaving process.
【0031】[0031]
【発明の効果】本発明によれば、高強力でかつ製織性が
良好で、耐久性及び寸法安定性に優れた高密度スクリ−
ンを提供することができる。According to the present invention, a high-density screen having high strength, good weaving properties, and excellent durability and dimensional stability.
Can be provided.
【図1】本発明で用いられる口金の具体例。FIG. 1 is a specific example of a base used in the present invention.
【図2】本発明により得られる芯鞘型複合繊維の横断面
形状の具体例。なお、図中AはAポリマ−、BはBポリ
マ−、CはCポリマ−を示す。FIG. 2 is a specific example of the cross-sectional shape of the core-sheath conjugate fiber obtained according to the present invention. In the figure, A indicates A polymer, B indicates B polymer, and C indicates C polymer.
フロントページの続き (51)Int.Cl.6 識別記号 FI D03D 9/00 D03D 9/00 15/00 15/00 A Continued on the front page (51) Int.Cl. 6 Identification code FI D03D 9/00 D03D 9/00 15/00 15/00 A
Claims (2)
族ポリエステルであり、鞘成分が屈曲性熱可塑性高分子
からなる海成分(Bポリマー)と溶融異方性芳香族ポリ
エステルからなる島成分(Cポリマー)により構成さ
れ、鞘成分比0.30〜0.60、島成分比0.25〜
0.5、引張強度が15g/d以上、弾性率400g/
d以上、繊維径35μm以下であるスクリーン紗用複合
モノフィラメント。1. An island wherein a core component (A polymer) is a melt anisotropic aromatic polyester, and a sheath component is a sea component (B polymer) comprising a flexible thermoplastic polymer and a melt anisotropic aromatic polyester. Component (C polymer), having a sheath component ratio of 0.30 to 0.60 and an island component ratio of 0.25 to
0.5, tensile strength of 15 g / d or more, elastic modulus of 400 g / d
d for screen gauze composite having a fiber diameter of 35 μm or less
Monofilament .
族ポリエステルであり、鞘成分が屈曲性熱可塑性高分子
からなる海成分(Bポリマー)と溶融異方性芳香族ポリ
エステルからなる島成分(Cポリマー)により構成さ
れ、鞘成分比0.30〜0.60、島成分比0.25〜
0.5、引張強度が15g/d以上、弾性率400g/
d以上、繊維径35μm以下である芯鞘型複合モノフィ
ラメントを用いたスクリーン紗。2. An island in which a core component (A polymer) is a melt anisotropic aromatic polyester, and a sheath component is a sea component (B polymer) composed of a flexible thermoplastic polymer and a melt anisotropic aromatic polyester. Component (C polymer), having a sheath component ratio of 0.30 to 0.60 and an island component ratio of 0.25 to
0.5, tensile strength of 15 g / d or more, elastic modulus of 400 g / d
d and a fiber diameter of 35 μm or less.
Screen gauze using lament .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7067713A JP2907418B2 (en) | 1995-03-27 | 1995-03-27 | Composite fiber for screen gauze and screen gauze |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7067713A JP2907418B2 (en) | 1995-03-27 | 1995-03-27 | Composite fiber for screen gauze and screen gauze |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08260249A JPH08260249A (en) | 1996-10-08 |
JP2907418B2 true JP2907418B2 (en) | 1999-06-21 |
Family
ID=13352883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP7067713A Expired - Lifetime JP2907418B2 (en) | 1995-03-27 | 1995-03-27 | Composite fiber for screen gauze and screen gauze |
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Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2242217C (en) * | 1997-07-10 | 2006-12-12 | Kuraray Co., Ltd. | Screen textile material |
JP4030688B2 (en) * | 1999-08-18 | 2008-01-09 | 株式会社クラレ | Foundation |
JP2002088587A (en) * | 2000-09-21 | 2002-03-27 | Kuraray Co Ltd | High strength conjugate fiber and meshed cloth |
JP4802663B2 (en) * | 2005-11-01 | 2011-10-26 | 東レ株式会社 | Core-sheath type composite fiber |
JPWO2010119756A1 (en) * | 2009-04-16 | 2012-10-22 | 株式会社クラレ | Pseudo monofilament yarn and manufacturing method thereof |
-
1995
- 1995-03-27 JP JP7067713A patent/JP2907418B2/en not_active Expired - Lifetime
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JPH08260249A (en) | 1996-10-08 |
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