JP4817780B2 - Light shielding fabric - Google Patents
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- JP4817780B2 JP4817780B2 JP2005279885A JP2005279885A JP4817780B2 JP 4817780 B2 JP4817780 B2 JP 4817780B2 JP 2005279885 A JP2005279885 A JP 2005279885A JP 2005279885 A JP2005279885 A JP 2005279885A JP 4817780 B2 JP4817780 B2 JP 4817780B2
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- 239000004744 fabric Substances 0.000 title claims description 47
- 239000006229 carbon black Substances 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 13
- 229920001169 thermoplastic Polymers 0.000 claims description 12
- 238000000034 method Methods 0.000 description 8
- 238000009941 weaving Methods 0.000 description 7
- 238000009987 spinning Methods 0.000 description 5
- 239000002759 woven fabric Substances 0.000 description 5
- -1 polyethylene terephthalate Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004043 dyeing Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000006224 matting agent Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D1/00—Woven fabrics designed to make specified articles
- D03D1/0035—Protective fabrics
- D03D1/007—UV radiation protecting
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Curtains And Furnishings For Windows Or Doors (AREA)
- Woven Fabrics (AREA)
Description
本発明は暗幕カーテンなどに用いられる、優れた遮光性を有する遮光性布帛に関するものである。 The present invention relates to a light-shielding fabric having excellent light-shielding properties used for a black curtain or the like.
従来から暗幕カーテンなどの遮光用布帛はカーボンブラックを含んだいわゆる黒原着（繊維形成性熱可塑性ポリマーにカーボンブラックを配合したもの）の糸が経糸又は／および緯糸に用いられているが、遮光性が不充分であり、その改善が望まれていた。
遮光性を向上させるためにカーボンブラック含有率を高めると紡糸工程での糸切れが多くなる。微細なカーボンブラックの中に粒径が大きなものが混じっているため、あるいは不純物が混在しているため、カーボンブラック含有率を高めるに従い粗大形の粒子や不純物に起因する紡糸工程における断糸発生を回避し難い。また遮光性を上げるためにカバーファクター（ＣＦと略記することがある）を高めると風合い、ドレープ性が低下してしまうという問題があった。
In the past, light-shielding fabrics such as black curtains have been used for warp and / or weft yarns of so-called black originals (carbon fiber blended with fiber-forming thermoplastic polymer) containing carbon black. Was insufficient, and improvement was desired.
If the carbon black content is increased in order to improve the light shielding property, yarn breakage in the spinning process increases. As fine particles of carbon black are mixed with large particles or impurities, the higher the carbon black content, the larger the carbon black content. It is difficult to avoid. Further, when the cover factor (sometimes abbreviated as CF) is increased in order to improve the light shielding property, there is a problem that the texture and drape properties are lowered.
ところで、インテリア製品に用いられる防視認性織物は、光を取り込みながら、同時に防視認性を備えている。特開２００４−１６２１９４号公報（特許文献１）に開示された技術は、特殊な断面形状を有するフィラメント（単繊維）を用いると、酸化チタンや炭酸カルシウムで代表される艶消し剤を全く含まない場合でも、防視認性を備えた布帛が得られることを示唆している。つまり、単繊維（モノフィラメント）の断面形状が２個所以上のくびれ部を有する断面扁平度２〜６の扁平断面であり、かつ艶消し剤の含有量が皆無か又は０．２重量％未満のような極めて少量の繊維形成性熱可塑性ポリマーからなるマルチフィラメントを、経糸又は緯糸を構成してなる織物となすことで防視認性が生じている。殊に、断面扁平に加えて、織物としたときのカバーファクター（ＣＦ）を８００〜２０００とすれば、防視認性が良くなることが暗示されている。 By the way, the visibility-proof fabric used for interior products has visibility at the same time while taking in light. The technique disclosed in Japanese Patent Application Laid-Open No. 2004-162194 (Patent Document 1) does not include any matting agent typified by titanium oxide or calcium carbonate when a filament (single fiber) having a special cross-sectional shape is used. Even in this case, it is suggested that a fabric having anti-visibility is obtained. That is, the cross-sectional shape of the single fiber (monofilament) is a flat cross section having a flatness of 2 to 6 having two or more constricted portions, and the content of the matting agent is none or less than 0.2% by weight. Visibility is prevented by making a multifilament made of a very small amount of a fiber-forming thermoplastic polymer into a woven fabric made of warp or weft. In particular, it is implied that the visibility is improved if the cover factor (CF) is 800 to 2000 in addition to the flat cross section.
そこで、断面扁平度がこの特許文献とほぼ同程度である扁平糸を用いて、防視認性に換えて、暗幕カーテンなどの遮光用布帛に転用する手段を試みたところ、繊維形成性熱可塑性ポリマー中のカーボンブラック含有率が少ないにも拘らず、遮光用布帛（暗幕カーテン）としてほぼ完全に遮光できることを知見し、本発明を完成した。
本発明の目的は、上記従来技術の問題点であった紡糸工程中の糸切れや布帛の風合い、ドレープ性の低下を解決し、遮光性に優れた遮光用布帛を得ることにある。 An object of the present invention is to solve the problems of the prior art described above, such as yarn breakage during the spinning process, fabric texture and drape, and to obtain a light-shielding fabric having excellent light-shielding properties.
本発明者らは、上記課題を解決するために鋭意検討を重ねた結果、単繊維フィラメントの断面扁平度を２〜６の扁平断面となし、またカーボンブラックの含有量を０．５〜５重量％（好ましくは１〜３重量％）に調製した繊維形成性熱可塑性ポリマーからなるマルチフィラメントを用いて製織し、カバーファクター（ＣＦ）が３５００以上５０００以下である遮光用布帛とすることにより、マルチフィラメントが織物組織点の接圧により緻密でワイドに広がった集合体となるため経糸と緯糸とで形成される空隙を小さくすることができ、その結果、優れたドレープ性と遮光性を有すること、さらには前記の特定断面を有するフィラメントが光の乱反射や屈折を起こし易くなり、遮光性が向上することを知見した。 As a result of intensive studies in order to solve the above problems, the present inventors have made the cross-sectional flatness of the single fiber filament a flat cross-section of 2-6, and the carbon black content is 0.5-5 wt. % (Preferably 1 to 3% by weight) of a multifilament made of a fiber-forming thermoplastic polymer, and a light shielding fabric having a cover factor (CF) of 3500 or more and 5000 or less is obtained. Since the filament becomes a dense and wide aggregate due to the contact pressure of the fabric texture point, the gap formed between the warp and the weft can be reduced, and as a result, it has excellent drape and light shielding properties, Furthermore, it has been found that the filament having the specific cross section is liable to cause irregular reflection and refraction of light, thereby improving the light shielding property.
本発明における請求項１に係る発明は、フィラメントの断面形状が２個所以上のくびれ部を有する断面扁平度２〜６の扁平断面であり、カーボンブラックの含有量が０．５〜５重量％である繊維形成性熱可塑性ポリマーからなるマルチフィラメントを用いて製織してなり、カバーファクター（ＣＦ）が３５００以上５０００以下であることを特徴とする遮光用布帛、である。
The invention according to
請求項２に係る発明は、繊維形成性熱可塑性ポリマーのカーボンブラックの含有量が１〜３重量％である請求項１に記載の遮光用布帛、である。
The invention according to claim 2 is the light-shielding fabric according to
請求項３に係る発明は、マルチフィラメントの全繊度が３０〜５００ｄｔｅｘであって、単繊維繊度が０．５〜５ｄｔｅｘの範囲から構成されている請求項１に記載の遮光用布帛、である。
The invention according to
また、請求項４に係る発明は、遮光率が９９．９９％以上である請求項１に記載の遮光用布帛、である。
The invention according to claim 4 is the light- shielding fabric according to
本発明によれば、遮光率９９．９９％以上の優れた遮光性を有する布帛が得られる。この布帛はカバーファクターが２０００超、５０００以下と大きいにも拘らず、風合いやドレープ性が保持されている。また黒色癌慮の添加量が少ないことから製糸工程が安定し、製品歩留まりも高い。 According to the present invention, a fabric having excellent light shielding properties with a light shielding ratio of 99.99% or more can be obtained. Although this fabric has a large cover factor of more than 2000 and not more than 5000, the texture and drape properties are maintained. In addition, since the amount of black cancer added is small, the spinning process is stable and the product yield is high.
以下、本発明の実施形態について、詳述する。
まず、本発明の遮光性織物の経糸又は緯糸を構成するマルチフィラメントは、繊維軸に対して直角方向の断面形状（横断面形状）が、２個所以上、好ましくは３〜５個所、のくびれ部を有する断面扁平度２〜６、好ましくは３〜５、のモノフィラメント（単繊維）からなる。
Hereinafter, embodiments of the present invention will be described in detail.
First, the multifilament constituting the warp or weft of the light-shielding woven fabric of the present invention has a constricted portion having a cross-sectional shape (cross-sectional shape) perpendicular to the fiber axis at two or more, preferably 3-5. It consists of a monofilament (single fiber) having a cross-sectional flatness of 2 to 6, preferably 3 to 5.
ここで、断面扁平度とは、フィラメントの横断面において、長辺の長さ（Ｂ）と短辺の長さ（Ｃ）との比（Ｂ／Ｃ）をいう。この断面扁平度が２よりも小さいと、織物中のマルチフィラメントがその幅方向にワイドに広がった集合形態を形成し難くなり、経糸と緯糸とで形成される空隙（組織空隙）が大きくなる懼れがある。その結果、糸・糸間の空隙から光が通過し、充分な遮光性を得ることができない懼れがあるので好ましくない。逆に、断面扁平度が６を超えると、製糸性が困難となるため好ましくない。 Here, the cross-sectional flatness refers to the ratio (B / C) of the long side length (B) to the short side length (C) in the cross section of the filament. When the cross-sectional flatness is smaller than 2, it becomes difficult to form a collective form in which the multifilaments in the woven fabric are widened in the width direction, and the gap (structure gap) formed by the warp and the weft becomes large. There is. As a result, light passes through the gap between the yarns, and there is a possibility that sufficient light shielding properties cannot be obtained. On the contrary, when the cross-sectional flatness exceeds 6, it is not preferable because the yarn-making property becomes difficult.
次に、前記のくびれ部とは図１に模式的に示すように、短辺の長さ（Ｃ）が短くなっている部分のことである。このくびれ部において、凹部の深さとしては、短辺の長さ（Ｃ）の最大値と最小値の比（Ｃの最大／Ｃの最小）で、１．０５以上（好ましくは１．１以上）となる深さであることが好ましい。また、図１において、凹部が両側部に形成されているものを例示するが、一方の側部にのみ、凹部が形成されていてもよい。そして、くびれ部の個数は２個所以上である必要があり、くびれ部が１個所ではくびれ部において充分な光の乱反射や透過光の屈折が得られず、満足な遮光性が得られないため好ましくない。くびれ部の個数は２個所以上であれば特に限定されないが、製糸性を考慮すると３〜５個所が適当である。なお、図１はくびれ部が３個所の場合を例示するものである。 Next, the constricted portion is a portion where the short side length (C) is shortened, as schematically shown in FIG. In this constricted portion, the depth of the concave portion is 1.05 or more (preferably 1.1 or more) as a ratio of the maximum value and minimum value of the short side length (C) (maximum of C / minimum of C). ) Is preferable. Moreover, in FIG. 1, although the thing in which the recessed part is formed in the both sides is illustrated, the recessed part may be formed only in one side part. The number of constrictions must be two or more, and if one constriction is present, sufficient irregular reflection of light and refraction of transmitted light cannot be obtained at the constriction, and satisfactory light shielding properties cannot be obtained. Absent. The number of constricted portions is not particularly limited as long as it is 2 or more, but 3 to 5 is appropriate in consideration of the yarn forming property. FIG. 1 illustrates the case where there are three constrictions.
さらに、前記マルチフィラメントは、カーボンブラックの含有量が０．５〜５重量％（好ましくは１〜３重量％）の繊維形成性熱可塑性ポリマーからなる。カーボンブラックの含有量が繊維重量に対して０．５重量％以下では、満足される遮光性が得られない。また、５重量％超では製糸時の工程安定性が低下し、モノフィラメントの断糸に起因する毛羽などが発生しやすくなり好ましくない。 Further, the multifilament is composed of a fiber-forming thermoplastic polymer having a carbon black content of 0.5 to 5% by weight (preferably 1 to 3% by weight). When the content of carbon black is 0.5% by weight or less with respect to the fiber weight, satisfactory light shielding properties cannot be obtained. On the other hand, if it exceeds 5% by weight, the process stability at the time of yarn production is lowered, and fluff and the like due to monofilament breakage tend to occur, which is not preferable.
なお、繊維形成性熱可塑性ポリマーに配合できる添加剤（ブレンド剤）としては、カーボンブラックに限らず有機系顔料などの着色剤をカーボンブラックにブレンドしても同等の機能が出るものであれば使用することができる。 Additives (blending agents) that can be blended into fiber-forming thermoplastic polymers are not limited to carbon black, but can be used as long as they have the same function even when blended with carbon black and other colorants. can do.
繊維形成性熱可塑性ポリマーについて補足説明すると、前記の繊維形成性熱可塑性ポリマーとしては、特に限定されないが、製造の容易さから、溶融紡糸で合成繊維が得られポリエチレンテレフタレートやポリトリメチレンテレフタレートに代表されるポリエステル、ポリアミド、ポリ塩化ビニリデン、ポリプロピレンなどの合成繊維用ポリマーを使用することができる。 As a supplementary explanation of the fiber-forming thermoplastic polymer, the fiber-forming thermoplastic polymer is not particularly limited, but for ease of production, synthetic fibers are obtained by melt spinning and are representative of polyethylene terephthalate and polytrimethylene terephthalate. Synthetic fiber polymers such as polyester, polyamide, polyvinylidene chloride, and polypropylene can be used.
前記マルチフィラメントの繊維形態としては、特に限定されず、長繊維でも短繊維でもよい。本発明のマルチフィラメントは、撚糸、仮撚捲縮加工や、タスラン加工やインターレース加工などの空気加工が施されたものでもよい。
前記マルチフィラメントの総繊度、単糸繊度については、特に限定されないが、風合いの点で、総繊度３０〜４００ｄｔｅｘ（より好ましくは５０〜２００ｄｔｅｘ）、単糸繊度０．５〜５ｄｔｅｘ（より好ましくは１〜４ｄｔｅｘ）の範囲が適当である。
The fiber form of the multifilament is not particularly limited, and may be a long fiber or a short fiber. The multifilament of the present invention may be subjected to air processing such as twisted yarn, false twist crimping, taslan processing or interlace processing.
The total fineness and single yarn fineness of the multifilament are not particularly limited, but in terms of texture, the total fineness is 30 to 400 dtex (more preferably 50 to 200 dtex), and the single yarn fineness is 0.5 to 5 dtex (more preferably 1). A range of ˜4 dtex) is suitable.
本発明の遮光性布帛において、経糸及び／又は緯糸が、前記マルチフィラメントで構成される。ここで、経糸と緯糸との両方を前記マルチフィラメントで構成することができる。勿論、経糸と緯糸のいずれか一方を前記マルチフィラメントで構成し、他方の緯糸又は経糸を使用して遮光性布帛としてもよい。また、前記マルチフィラメントを用いて、経糸及び／又は緯糸を構成する際、本発明の目的を損なわない範囲内で少量の「他の糸」（円形断面繊維や三角断面繊維を含む）を混ぜ合わせて使用してもよい。 In the light-shielding fabric of the present invention, the warp and / or the weft are composed of the multifilament. Here, both the warp and the weft can be composed of the multifilament. Of course, either one of the warp and the weft may be constituted by the multifilament, and the other weft or warp may be used as a light-shielding fabric. In addition, when a warp and / or a weft is constituted using the multifilament, a small amount of “other yarn” (including a circular cross-section fiber and a triangular cross-section fiber) is mixed within a range that does not impair the object of the present invention. May be used.
本発明の黒色顔料を含むマルチフィラメントからなる遮光性織物において、カバーファクター（ＣＦ）を２０００を越え、５０００以下とする必要がある。
ここで、カバーファクター（ＣＦ）とは次式により表されるものである。
Here, the cover factor (CF) is expressed by the following equation.
ＣＦが２０００以下では、経糸と緯糸とで形成される空隙が大きくなりすぎるため、遮光性が低下し、好ましくない。逆に、ＣＦが５０００を越えると、風合い、ドレープ性が低下するので好ましくない。 When the CF is 2000 or less, the gap formed between the warp and the weft is too large, which is not preferable because the light shielding property is lowered. On the other hand, if the CF exceeds 5000, the texture and drape properties deteriorate, which is not preferable.
本発明の遮光性布帛において、織組織は特に限定されず、平組織、綾組織、サテン組織など公知の織組織を適用することができる。
本発明の遮光性布帛は、前記のマルチフィラメントを経糸及び／又は緯糸に用いて常法の製織方法で製織するにより、容易に得ることができる。なお、多重織物の場合は少なくとも１層で前記のマルチフィラメントを使用すればよい。
In the light-shielding fabric of the present invention, the woven structure is not particularly limited, and a known woven structure such as a plain structure, a twill structure, and a satin structure can be applied.
The light-shielding fabric of the present invention can be easily obtained by weaving the multifilament as a warp and / or weft by a conventional weaving method. In the case of multiple fabrics, the multifilament may be used in at least one layer.
このようにして得られた本発明の遮光性織物において、遮光率が９９．９％以上であることが好ましい。ここで、遮光率とは、ＪＩＳ Ｌ１０５５ ６．１Ａ法（照度１０万ｌｘ）によって測定したものをいう。このような遮光率を有する織物は、前記のマルチフィラメントを経糸又は緯糸に用いて前記カバーファクター（ＣＦ）となるように織成することで形成される。 In the light-shielding fabric of the present invention thus obtained, the light-shielding rate is preferably 99.9% or more. Here, the light shielding rate refers to a value measured by the JIS L1055 6.1A method (illuminance 100,000 lx). The fabric having such a light shielding rate is formed by weaving the multifilament as warp or weft so as to have the cover factor (CF).
本発明の遮光性布帛において、マルチフィラメントを構成するフィラメントの横断面形状が特殊な扁平であるため、マルチフィラメントは、織物組織点の接圧により、緻密かつワイドに広がった構造を有する。その結果、経糸と緯糸とで形成される空隙が小さくなり、この空隙からの光の透過量が低減する。その際、この空隙を通過する微量の透過光は回折を起こし、隣り合った透過光が互いに干渉することに起因して優れた遮光効果が得られる。さらに、フィラメントの横断面形状を特定のくびれ部を有する扁平断面形状としているため、同繊度のフラットな扁平断面糸、丸断面糸、三角断面糸と比較して光の乱反射やフィラメントを透過する透過光の屈折が大きくなり、遮光性が向上する。 In the light-shielding fabric of the present invention, since the cross-sectional shape of the filaments constituting the multifilament is a special flat shape, the multifilament has a structure that is densely and widely spread by the contact pressure of the fabric texture point. As a result, the gap formed by the warp and the weft is reduced, and the amount of light transmitted through the gap is reduced. At that time, a small amount of transmitted light passing through the gap is diffracted, and an excellent light shielding effect is obtained due to interference between adjacent transmitted lights. Furthermore, since the cross-sectional shape of the filament is a flat cross-sectional shape with a specific constriction, light is reflected irregularly and transmitted through the filament compared to flat flat cross-section yarn, round cross-section yarn, and triangular cross-section yarn of the same fineness. Light refraction is increased, and the light shielding property is improved.
加えて、本発明の遮光性布帛において、マルチフィラメントが幅方向にワイドに広がった構造を有するため、曲げ剛性が低くなりソフトな風合いも付加される。さらには、織物組織点において、くびれ部（凹部）は他方の糸に接触し難いため経糸と緯糸との摩擦が小さくなり、フラットな扁平形状を有するものよりも一層ソフトな風合いを得ることも可能になる。 In addition, the light-shielding fabric of the present invention has a structure in which multifilaments are widened in the width direction, so that bending rigidity is reduced and a soft texture is also added. Furthermore, at the fabric texture point, the constricted part (concave part) is less likely to come into contact with the other thread, so the friction between the warp and the weft is reduced, and it is possible to obtain a softer texture than that having a flat flat shape. become.
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）遮光率
ＪＩＳ Ｌ１０５５ ６．１Ａ法（照度１０万ｌｘ）によって遮光率（％）を求めた。
（２）風合い
布帛の触感による官能評価を行い、◎：柔らかく極めて良好、○：良好、△：やや粗硬感あり、×：粗硬感あり不良、と判断した。
Examples and Comparative Examples of the present invention will be described in detail, but the present invention is not limited thereto. In addition, each measurement item in an Example was measured with the following method.
(1) Light-shielding rate The light-shielding rate (%) was calculated | required by JISL10556.1A method (illuminance 100,000lx).
(2) Texture A sensory evaluation based on the touch of the fabric was performed, and it was determined that く: soft and extremely good, ◯: good, Δ: slightly rough and hard, ×: poor and hard.
［実施例１］
カーボンブラックを１．５重量％含む、固有粘度０．６３のポリエチレンテレフタレートを４つ山扁平断面（くびれ部３個所）に穿孔された口金より、紡糸温度２９０℃で紡出し、２０００ｍ／ｍｉｎで引き取り、一旦巻き取ることなく、引き続き２．５倍に延伸し、モノフィラメントの横断面形状が図１に示すような、くびれ部（短辺の長さＣの最大／最小＝１．２）を３個所有する扁平断面（断面扁平度３．２）のマルチフィラメントを無撚条件で製造した。
この扁平糸を経緯双方に１００％使用し、常法の製織方法により平織物を得た。そして、常法の染色加工を施すことにより、カバーファクター３５００の遮光用布帛を得た。得られた布帛の遮光率は９９．９９５％であり、風合いは柔らかく極めて良好（◎）であった。
[Example 1]
Spinning was performed at a spinning temperature of 290 ° C. from a die having four polyethylene terephthalates containing 1.5% by weight of carbon black and having an intrinsic viscosity of 0.63 drilled in a flat cross section (necked at three constrictions) and taken up at 2000 m / min. Without winding up, the constricted portion (maximum / minimum of the short side length C = 1.2) is 3 times as shown in FIG. A multifilament having a flat cross section (cross section flatness of 3.2) was produced under non-twisting conditions.
A flat woven fabric was obtained by a conventional weaving method using 100% of the flat yarn for both the background and the background. And the cloth for shading of cover factor 3500 was obtained by giving a usual dyeing process. The obtained fabric had a light shielding ratio of 99.995%, and the texture was soft and very good (良好).
［実施例２］
実施例１において、遮光性織物のカバーファクターを２８００に変える以外は実施例１と同様に製織・染色加工することにより、遮光性布帛を得た。この布帛の遮光率は９９．９９２％であり、また風合いも柔らかく極めて良好（◎）であった。
[Example 2]
In Example 1, except that the cover factor of the light-shielding fabric was changed to 2800, weaving and dyeing were performed in the same manner as in Example 1 to obtain a light-shielding fabric. The fabric had a light shielding ratio of 99.992%, and the texture was soft and very good (良好).
［実施例３］
実施例１において、遮光性織物のカバーファクターを４０００に変える以外は実施例１と同様に製織・染色加工することにより、遮光性布帛を得た。この布帛の遮光率は９９．９９７％であり、その風合いは良好（○）であった。
[Example 3]
In Example 1, a light-shielding fabric was obtained by weaving and dyeing in the same manner as in Example 1 except that the cover factor of the light-shielding fabric was changed to 4000. The light shielding rate of this fabric was 99.997%, and the texture was good (◯).
［比較例１］
実施例１において、フィラメントの横断面形状を、くびれ部のないフラット扁平断面（断面扁平度３．２）に変える以外は実施例１と同様にして、マルチフィラメントを得、次いで実施例と同様に製織して遮光性布帛を得た。この布帛の遮光率は９９．９７０％であり、風合いはやや粗硬（△）であった。
[Comparative Example 1]
In Example 1, a multifilament was obtained in the same manner as in Example 1 except that the cross-sectional shape of the filament was changed to a flat flat cross section (cross section flatness of 3.2) without a constricted portion. Weaving gave a light-shielding fabric. This fabric had a light-shielding rate of 99.970%, and the texture was slightly coarse (Δ).
［比較例２］
実施例１において、フィラメントの横断面形状を、丸断面に変える以外は実施例１と同様にして、遮光性布帛を得た。この布帛の遮光率は９９．９６５％であったが、その風合いには粗硬感あり不良（×）と判断した。
[Comparative Example 2]
In Example 1, a light-shielding fabric was obtained in the same manner as in Example 1 except that the cross-sectional shape of the filament was changed to a round cross-section. The light shielding rate of this fabric was 99.965%, but the texture was judged to be poor (x) with a feeling of coarseness.
本発明の遮光性織物は、適宜縫製された後、暗幕カーテンなどの遮光用布帛として好適に用いられる。 The light-shielding fabric of the present invention is suitably used as a light-shielding fabric such as a black curtain after being properly sewn.
１ くびれ部
Ｂ 長径
Ｃ 短径
1 Constricted part B Long diameter C Short diameter
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