JP2010129486A - Cable covering insulator - Google Patents
Cable covering insulator Download PDFInfo
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- JP2010129486A JP2010129486A JP2008305549A JP2008305549A JP2010129486A JP 2010129486 A JP2010129486 A JP 2010129486A JP 2008305549 A JP2008305549 A JP 2008305549A JP 2008305549 A JP2008305549 A JP 2008305549A JP 2010129486 A JP2010129486 A JP 2010129486A
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- nonwoven fabric
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 4
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- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 229920000305 Nylon 6,10 Polymers 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
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- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 description 2
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- 239000012760 heat stabilizer Substances 0.000 description 2
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- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920000747 poly(lactic acid) Polymers 0.000 description 2
- 229920001230 polyarylate Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920005668 polycarbonate resin Polymers 0.000 description 2
- 239000004431 polycarbonate resin Substances 0.000 description 2
- 229920001601 polyetherimide Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000009719 polyimide resin Substances 0.000 description 2
- 239000004626 polylactic acid Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920001955 polyphenylene ether Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 2
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- 239000004814 polyurethane Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
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- 239000004743 Polypropylene Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 238000005304 joining Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacturing Of Multi-Layer Textile Fabrics (AREA)
- Nonwoven Fabrics (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
本発明は、ケーブル、特に特性インピーダンスを設定する為の低誘電層として好適なフレキシブルフラットケーブル被覆用絶縁体、フレキシブルプリント回路配線基板用絶縁体に関する。 The present invention relates to an insulator for covering a flexible flat cable and an insulator for a flexible printed circuit wiring board, which are suitable as a low dielectric layer for setting a cable, in particular, a characteristic impedance.
近年、液晶ディスプレイ、プラズマディスプレイ等に接続される電子機器の高速伝送用の配線ケーブルとして、フレキシブルフラットケーブルが用いられている。フレキシブルフラットケーブルを高速伝送用の配線ケーブルとして使用する場合、当該フレキシブルフラットケーブルの特性インピーダンスを、高速デジタル信号の送信用・受信用ＩＣのインピーダンスと同じ１００Ωに設定する必要がある。 In recent years, flexible flat cables have been used as wiring cables for high-speed transmission of electronic devices connected to liquid crystal displays, plasma displays, and the like. When a flexible flat cable is used as a wiring cable for high-speed transmission, it is necessary to set the characteristic impedance of the flexible flat cable to 100Ω, which is the same as the impedance of a high-speed digital signal transmission / reception IC.
フレキシブルフラットケーブルの特性インピーダンスを目的値に設定する際、ケーブルを被覆する絶縁層の厚みを厚くし、誘電率を低くすることが有効である。具体的には、絶縁層厚：ｈ、導体線幅：ｗ、導体厚：ｔ、絶縁体の誘電率：εｒであるとき、特性インピーダンスＺｏは、マイクロストリップラインの式として知られている以下の数式（１）：
絶縁体の誘電率は、空隙層を含むことにより、低くなることが知られている。そこで、ケーブルを被覆する絶縁層として一般に発泡シートより空隙率が高い不織布、特にポリエチレンテレフタレート等のポリエステルやアラミド繊維からなる不織布が用いられてきた。しかしながら、これらの不織布では、不織布全体の平均値としては誘電率を低くすることができるものの（例えば、以下の特許文献１を参照のこと）、ケーブルを被覆した場合、各々のケーブル線上の各位置での安定した電気特性を確保する点で満足のいくものではなかった。 It is known that the dielectric constant of an insulator is lowered by including a void layer. Therefore, a nonwoven fabric generally having a higher porosity than the foamed sheet, particularly a nonwoven fabric made of polyester such as polyethylene terephthalate or aramid fiber, has been used as an insulating layer covering the cable. However, in these nonwoven fabrics, although the dielectric constant can be lowered as an average value of the entire nonwoven fabric (see, for example, Patent Document 1 below), when a cable is covered, each position on each cable line It was not satisfactory in terms of ensuring stable electrical characteristics.
本発明が解決しようとする課題は、上述の問題に鑑みてなされたものであり、ケーブルを被覆する絶縁層として、特に特性インピーダンスを設定するための低誘電層として好適であり、かつ、形態安定性にも優れたケーブル被覆用絶縁体を提供することである。 The problem to be solved by the present invention has been made in view of the above-mentioned problems, and is suitable as an insulating layer for covering a cable, particularly as a low dielectric layer for setting characteristic impedance, and for form stability. It is providing the insulator for cable coatings which was excellent also in the property.
本発明者らは、上記課題を解決するために鋭意研究を重ねた結果、熱可塑性合成繊維の不織布層に極細繊維の不織布層を積層し、繊維間空隙を均一化及び微小化し、かつ、空隙容積を特定範囲とすることにより、形態安定性に優れ、かつ、電気特性にも優れたケーブル被覆用絶縁体を得ることができることを発見し、かかる発見に基づき、本発明を完成するに至った。 As a result of intensive studies to solve the above problems, the present inventors have laminated a nonwoven fabric layer of ultrafine fibers on a nonwoven fabric layer of thermoplastic synthetic fibers, uniformized and miniaturized the interfiber spaces, and It was discovered that by setting the volume in a specific range, an insulator for cable covering having excellent shape stability and electrical characteristics can be obtained, and based on this discovery, the present invention has been completed. .
具体的には、本発明は、以下の［１］〜［６］である：
［１］繊維径が７〜２０μｍである熱可塑性合成繊維の不織布層（Ａ）と、繊維径が０．５〜５μｍである極細繊維の不織布層（Ｂ）とが、各々１層以上、接合一体化してなる積層不織布からなるケーブル被覆用絶縁体であって、該積層不織布の空隙体積が７０〜５００ｃｍ３／ｍ２であることを特徴とする前記絶縁体。
Specifically, the present invention is the following [1] to [6]:
[1] One or more layers each of a nonwoven fabric layer (A) of thermoplastic synthetic fiber having a fiber diameter of 7 to 20 μm and a nonwoven fabric layer (B) of ultrafine fiber having a fiber diameter of 0.5 to 5 μm A cable-covering insulator made of a laminated nonwoven fabric that is integrally formed, wherein the void volume of the laminated nonwoven fabric is 70 to 500 cm 3 / m 2 .
［２］前記積層不織布が、Ａ／Ｂ型又はＡ／Ｂ／Ａ型である、前記［１］に記載の絶縁体。 [2] The insulator according to [1], wherein the laminated nonwoven fabric is A / B type or A / B / A type.
［３］前記不織布層（Ａ）がスパンボンド不織布層であり、かつ、前記極細繊維の不織布層（Ｂ）がメルトブロー不織布層である、前記［１］又は［２］に記載の絶縁体。 [3] The insulator according to [1] or [2], wherein the nonwoven fabric layer (A) is a spunbond nonwoven fabric layer, and the nonwoven fabric layer (B) of the ultrafine fibers is a meltblown nonwoven fabric layer.
［４］前記積層不織布の平均流量孔径が０．１〜１５μｍであり、かつ、最大孔径が３０μｍ以下である、前記［１］〜［３］のいずれかに記載の絶縁体。 [4] The insulator according to any one of [1] to [3], wherein the laminated nonwoven fabric has an average flow pore size of 0.1 to 15 μm and a maximum pore size of 30 μm or less.
［５］前記積層不織布が、ポリエステル系樹脂又はポリアミド系樹脂からなる、前記［１］〜［４］いずれか記載の絶縁体。 [5] The insulator according to any one of [1] to [4], wherein the laminated nonwoven fabric is made of a polyester resin or a polyamide resin.
［６］前記積層不織布の厚みが、８０〜６００μｍであり、かつ、目付が、１５〜２５０ｇ／ｍ２である、前記［１］〜［５］のいずれかに記載の絶縁体。 [6] The insulator according to any one of [1] to [5], wherein the thickness of the laminated nonwoven fabric is 80 to 600 μm, and the basis weight is 15 to 250 g / m 2 .
本発明に係るケーブル被覆用絶縁体は、絶縁体としての表面耐摩耗性、剥離性が良好であり、また、本発明に係るケーブル被覆用絶縁体を用いることにより、ケーブル内の位置における絶縁層に由来する特性インピーダンスのバラツキを少なくすること、及び特性インピーダンスを安定して設定すること、特に、高速デジタル信号の送信用・受信用ＩＣのインピーダンスと同じ１００Ωに安定して設定することができる。 The insulator for cable covering according to the present invention has good surface wear resistance and peelability as an insulator, and the insulating layer at a position in the cable by using the insulator for cable covering according to the present invention. It is possible to reduce the variation of the characteristic impedance derived from the above and to set the characteristic impedance stably, in particular, to stably set to 100Ω, which is the same as the impedance of the high-speed digital signal transmission / reception IC.
以下、本願発明について具体的に説明する。
本発明に係るケーブル被覆用絶縁体は、、繊維径が７〜２０μｍである熱可塑性合成繊維の不織布層（Ａ）（以下、単に「Ａ層」ともいう。）と、繊維径が０．５〜５μｍである極細繊維の不織布層（Ｂ）（以下、単に「Ｂ層」ともいう。）とが、各々１層以上、接合一体化してなる積層不織布から構成される必要がある。
Hereinafter, the present invention will be specifically described.
The cable covering insulator according to the present invention has a nonwoven fabric layer (A) of thermoplastic synthetic fiber (hereinafter also referred to simply as “A layer”) having a fiber diameter of 7 to 20 μm and a fiber diameter of 0.5. The nonwoven fabric layer (B) (hereinafter also simply referred to as “B layer”) of ultrafine fibers having a thickness of ˜5 μm needs to be composed of laminated nonwoven fabrics in which one or more layers are joined and integrated.
一般に、不織布は、繊維とその間隙である空隙から構成されるが、空隙の塊の形状は一般にランダムである。例えは、一般のスパンボンド不織布の開孔径分布を見た場合、開孔径分布の範囲は３０μｍを超える。すなわち、不織布内には概略直径が３０μｍ以上の大きな空隙の塊が含まれることになる。不織布における実際の開孔径測定値は、シート内の貫通孔中、最もくびれた部分を測定することになるので、空隙の塊は開孔径の測定値の直径の球体よりさらに大きい可能性がある。また、発泡体と異なり不織布では隣り合う空隙が連続している為、不織布シート内に存在する空隙の塊としては、開孔径測定値の直径から計算した空隙よりも大きい空隙の塊が存在する可能性がある。一方、孔径の小さな部分では繊維の密度が高く空隙量が少ない為、誘電率が高くなってしまう。この為、ケーブルの絶縁層として不織布を用いる場合、孔径の大きな部分と小さな部分の差によりインピーダンスが安定せず、全体としては性能の低いケーブルになってしまうという問題がある。 Generally, a nonwoven fabric is comprised from the space | gap which is a fiber and its space | gap, but the shape of the lump of space | gap is generally random. For example, when the pore size distribution of a general spunbonded nonwoven fabric is seen, the range of the pore size distribution exceeds 30 μm. That is, a large void mass having an approximate diameter of 30 μm or more is included in the nonwoven fabric. Since the actual measurement value of the hole diameter in the nonwoven fabric is measured at the most constricted portion in the through hole in the sheet, the void mass may be larger than the sphere having the diameter of the measurement value of the hole diameter. In addition, since the adjacent voids are continuous in the nonwoven fabric unlike the foam, the void mass present in the nonwoven fabric sheet may have a void mass larger than the void calculated from the diameter of the measured aperture diameter. There is sex. On the other hand, the dielectric constant becomes high because the fiber density is high and the amount of voids is small in the portion where the hole diameter is small. For this reason, when using a nonwoven fabric as an insulating layer of a cable, there exists a problem that an impedance is not stabilized by the difference of a large diameter part and a small part, and it becomes a cable with a low performance as a whole.
そこで、本発明者らは、熱可塑性合成繊維の不織布層と極細繊維の不織布層とが接合一体化してなる積層不織布とすることで、通常存在する不織布内の大きな空隙の塊を極細繊維の不織布層内で細分化することができるため、該積層不織布を絶縁層として用いた場インピーダンスが安定したケーブルを得ることができることを発見した。すなわち、Ａ層とＢ層を積層して極細繊維の層を存在させることにより、不織布内にある空隙の塊は極細繊維の層が無い不織布内の空隙の塊の様に大きな状態で存在することが無く、ケーブル上のどの位置においても繊維と空隙の混合状態が均一化されるため、絶縁層として使用した場合にケーブル上の各位置におけるインピーダンスの均一性の高いケーブルが得られることになる。 Therefore, the present inventors have formed a laminated nonwoven fabric in which a nonwoven fabric layer of thermoplastic synthetic fibers and a nonwoven fabric layer of ultrafine fibers are joined and integrated, so that a lump of large voids in the nonwoven fabric that normally exists can be made into a nonwoven fabric of ultrafine fibers. It was discovered that a cable with stable field impedance using the laminated nonwoven fabric as an insulating layer can be obtained because it can be subdivided within the layer. That is, by laminating the A layer and the B layer to make the ultrafine fiber layer exist, the void mass in the nonwoven fabric exists in a large state like the void mass in the nonwoven fabric without the ultrafine fiber layer. Since the mixed state of the fiber and the gap is made uniform at any position on the cable, a cable having high impedance uniformity at each position on the cable can be obtained when used as an insulating layer.
この様に、本発明に係る絶縁体を構成する積層不織布は、不織布の繊維径を最適化し、極細繊維層を適切に配することで繊維間の空隙を微小化、均一化し、さらに、全体としての空隙容積を特定範囲とすることによって優れた絶縁特性を発揮させることを、特徴とする。 In this way, the laminated nonwoven fabric constituting the insulator according to the present invention optimizes the fiber diameter of the nonwoven fabric, appropriately arranges the ultrafine fiber layer, thereby minimizing and uniforming the gap between the fibers, and as a whole It is characterized by exhibiting excellent insulating properties by making the void volume of the specific range.
ここで、本発明に係る絶縁体を構成する積層不織布は、前記熱可塑性合成繊維の不織布層（Ａ）が前記極細繊維の不織布層（Ｂ）の両面に存在するＡ／Ｂ／Ａ型の積層不織布であることが好ましい。すなわち、合成繊維不織布層は、極細繊維の不織布層の介在によって、２層に分けられていることが好ましい。２層に分けることにより、合成繊維層内の空隙の塊が厚み方向に連続して繋がることが無く、より安定したインピーダンスを与えることができる。 Here, the laminated nonwoven fabric constituting the insulator according to the present invention is an A / B / A laminate in which the nonwoven fabric layer (A) of the thermoplastic synthetic fiber is present on both surfaces of the nonwoven fabric layer (B) of the ultrafine fiber. It is preferable that it is a nonwoven fabric. That is, it is preferable that the synthetic fiber nonwoven fabric layer is divided into two layers by intervening the nonwoven fabric layer of ultrafine fibers. By dividing into two layers, a lump of voids in the synthetic fiber layer is not continuously connected in the thickness direction, and more stable impedance can be given.
前記極細繊維の層（Ｂ層）は、不織布の中で層状態を保っている必要がある。この確認方法として、開孔径を用いることができる。極細繊維の層（Ｂ層）が存在する場合の開孔径は、極細繊維層が含まれない場合と比較して、平均流量孔径が小さく、孔径分布が狭くなる。この為、本発明に係る絶縁体を構成する積層不織布の平均流量孔径は、０．１μｍ以上１５μｍ以下であることことが好ましく、より好ましくは５μｍ以下、さらに好ましくは２μｍ以下である。平均流量孔径が１５μｍを超えると、孔径の大きな部分の連続した空隙の塊の形状が大きくなり、該部分の誘電特性が安定しなくなり、一方、平均流量孔径が０．１μｍを下回ると、該部分の繊維充填率が高くなりすぎ、誘電特性が高くなる。また最大孔径は、好ましくは３０μｍ以下であり、より好ましくは１５μｍ以下、さらに好ましくは５μｍ以下である。最大孔径が３０μｍを超えると、不織布内の空隙の塊が大きくなり、ケーブルの絶縁層として用いる場合、該当部分のインピーダンスが周辺部分と差を生じ、ケーブルの性能が安定しなくなる。 The ultrafine fiber layer (B layer) needs to maintain a layer state in the nonwoven fabric. As this confirmation method, the aperture diameter can be used. The pore diameter when the ultrafine fiber layer (B layer) is present is smaller than the average pore diameter and the pore diameter distribution is narrower than when the ultrafine fiber layer is not included. For this reason, it is preferable that the average flow hole diameter of the laminated nonwoven fabric which comprises the insulator which concerns on this invention is 0.1 micrometer or more and 15 micrometers or less, More preferably, it is 5 micrometers or less, More preferably, it is 2 micrometers or less. If the average flow pore diameter exceeds 15 μm, the shape of the continuous void mass of the large pore diameter portion becomes large, and the dielectric characteristics of the portion become unstable. On the other hand, if the average flow pore diameter is less than 0.1 μm, the portion The fiber filling rate becomes too high, and the dielectric properties become high. The maximum pore diameter is preferably 30 μm or less, more preferably 15 μm or less, and still more preferably 5 μm or less. When the maximum pore diameter exceeds 30 μm, the lump of voids in the nonwoven fabric becomes large, and when used as an insulating layer of a cable, the impedance of the corresponding part differs from the peripheral part, and the performance of the cable becomes unstable.
本発明において、不織布層（Ａ）の繊維径は７〜２０μｍである必要がある。繊維径が２０μｍを超えると、繊維間の空隙の塊の大きさが大きくなりすぎてしまい、ケーブルのインピーダンスの安定性が悪くなってしまい、一方、７μｍを下回ると繊維の剛性が下がり、不織布として空隙を含んだ形態を維持できず空隙量の少ない不織布になってしまう。 In this invention, the fiber diameter of a nonwoven fabric layer (A) needs to be 7-20 micrometers. When the fiber diameter exceeds 20 μm, the size of the gap between the fibers becomes too large, and the stability of the impedance of the cable is deteriorated. A form containing voids cannot be maintained, resulting in a nonwoven fabric with a small amount of voids.
本発明において、不織布層（Ａ）には、公知の製造方法により得られる不織布を用いることができる。なかでも、熱可塑性合成樹脂からなるスパンボンド不織布が、強度が強く、表面の耐摩耗性も強く、ケーブル製造の加工適性に優れる点で、好ましく使用される。不織布層（Ａ）が無く、極細繊維層（Ｂ）のみで構成した不織布を用いた場合には、表面の耐摩耗性が弱く、製造時や装置への組み込み後に、毛羽立ち、リントの発生してしまう虞がある。
本発明において、極細繊維層（Ｂ）の繊維径は０．５〜５μｍである必要がある。繊維径が５μｍを超えると、繊維間の空隙の塊を極細繊維層で細分化する効果が得られ難くなる。０．５μｍを下回ると極細繊維層の繊維充填密度が高く、空隙量の少ない層となってしまう。
In this invention, the nonwoven fabric obtained by a well-known manufacturing method can be used for a nonwoven fabric layer (A). Among these, a spunbond nonwoven fabric made of a thermoplastic synthetic resin is preferably used because it has high strength, high surface wear resistance, and excellent processability for cable production. When a non-woven fabric layer (A) is used and a non-woven fabric composed only of an ultrafine fiber layer (B) is used, the surface wear resistance is weak, and fluffing and lint are produced during production or after incorporation into the device. There is a risk of it.
In the present invention, the fiber diameter of the ultrafine fiber layer (B) needs to be 0.5 to 5 μm. When the fiber diameter exceeds 5 μm, it becomes difficult to obtain an effect of subdividing the lump of voids between the fibers with the ultrafine fiber layer. When the thickness is less than 0.5 μm, the fiber filling density of the ultrafine fiber layer is high and the void amount is small.
本発明において、不織布層（Ａ）を構成する樹脂として、ポリエステル系又はポリアミド系、ポリオレフィン系の樹脂を用いることができる。なかでも、耐熱性に優れ、強力が高く、表面が毛羽立ちし難いという点から、ポリエステル系樹脂又はポリアミド系樹脂が好ましい。ポリエステル系樹脂としては、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリトリメチレンテレフタレートなどテレフタル酸、イソフタル酸やフタル酸、ナフタリンジカルボン酸等の芳香族ジカルボン酸と、エチレングリコール、ジエチレングリコール、１，４−ブタンジオール、シクロヘキサンジメタノール等のジオールとが重合されたものであれば良い。また上記ポリエステルは生分解性樹脂、例えばポリ乳酸を初めとする脂肪族ポリエステルであってもよい。ポリアミド系樹脂としては、ナイロン６、ナイロン６６、ナイロン６１０、ナイロン６１２などが挙げられ、また、ポリカーボネート樹脂、変性ポリフェニレンエーテル樹脂、ポリフェニレンサルファイド樹脂、ポリイミド樹脂、ポリエーテルイミド樹脂、ポリアリレート樹脂、フッ素系樹脂、スチレン系熱可塑性エラストマー、オレフィン系熱可塑性エラストマーなどを用いてもよい。 In the present invention, polyester-based, polyamide-based, or polyolefin-based resins can be used as the resin constituting the nonwoven fabric layer (A). Of these, polyester resins and polyamide resins are preferred from the viewpoints of excellent heat resistance, high strength, and difficulty in fuzzing the surface. Examples of polyester resins include terephthalic acid such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate, aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, and naphthalene dicarboxylic acid, and ethylene glycol, diethylene glycol, 1,4-butanediol, Any polymer that is polymerized with a diol such as cyclohexanedimethanol may be used. The polyester may be a biodegradable resin, for example, an aliphatic polyester including polylactic acid. Examples of the polyamide-based resin include nylon 6, nylon 66, nylon 610, nylon 612, etc., and polycarbonate resin, modified polyphenylene ether resin, polyphenylene sulfide resin, polyimide resin, polyetherimide resin, polyarylate resin, fluorine-based resin. Resins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, and the like may be used.
また、これらの樹脂を主体とする共重合体や混合物を用いてもよい。中でも、ポリエステル系樹脂は、強度や寸法安定性が高いため、より好ましく使用される。また、実用強度に影響の無い範囲においては、少量のポリオレフィン、ポリアミド類、ポリウレタン類を添加しても良いし、同様に本発明の効果を阻害しない程度に、原着や、酸化チタン、紫外線吸収剤や、熱安定剤、酸化防止剤等の任意の添加剤が添加されても良い。 A copolymer or a mixture mainly composed of these resins may be used. Of these, polyester resins are more preferably used because of their high strength and dimensional stability. In addition, a small amount of polyolefins, polyamides, polyurethanes may be added within a range that does not affect the practical strength. Arbitrary additives such as an agent, a heat stabilizer, and an antioxidant may be added.
本発明において、極細繊維の不織布層（Ｂ）としては、公知の製造方法により得られる極細繊維の不織布を用いることができるが、溶剤や溶液を使用しないので環境負荷が小さいという点で、熱可塑性樹脂からなるメルトブロー不織布が好ましく使用される。 In the present invention, as the ultrafine fiber nonwoven fabric layer (B), an ultrafine fiber nonwoven fabric obtained by a known production method can be used. However, since no solvent or solution is used, it is thermoplastic in that it has a low environmental impact. A melt blown nonwoven fabric made of resin is preferably used.
極細繊維の不織布層（Ｂ）を構成する樹脂は、既存のどのような樹脂であっても構わないが、極細繊維の不織布がメルトブロー不織布であって、これとスパンボンド不織布層とを積層する場合は、スパンボンド不織布層と共通の樹脂成分を含むことが、折り曲げ時の層間剥離を防止する為の接着性を上げることができるという観点から好ましい。 The resin constituting the ultrafine fiber nonwoven fabric layer (B) may be any existing resin, but the ultrafine fiber nonwoven fabric is a melt blown nonwoven fabric, and this is laminated with a spunbond nonwoven fabric layer. It is preferable that the resin component common to the spunbond nonwoven fabric layer is included from the viewpoint of improving the adhesion for preventing delamination during bending.
極細繊維の不織布層（Ｂ）を構成する樹脂としては、融点が１８０℃以上であり耐熱性が高く、乾燥時の強度が高いという点から、ポリエステル系樹脂、ポリアミド系樹脂、これらを主体とする共重合体や混合物が好ましく使用される。ポリエステル系樹脂としては、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリトリメチレンテレフタレートなどテレフタル酸、イソフタル酸やフタル酸、ナフタリンジカルボン酸等の芳香族ジカルボン酸と、エチレングリコール、ジエチレングリコール、１，４−ブタンジオール、シクロヘキサンジメタノール等のジオールとが重合されたものであれば良い。また上記ポリエステルは生分解性樹脂、例えばポリ乳酸を初めとする脂肪族ポリエステルであってもよい。ポリアミド系樹脂としては、ナイロン６、ナイロン６６、ナイロン６１０、ナイロン６１２などが挙げられ、また、ポリカーボネート樹脂、変性ポリフェニレンエーテル樹脂、ポリフェニレンサルファイド樹脂、ポリイミド樹脂、ポリエーテルイミド樹脂、ポリアリレート樹脂、フッ素系樹脂、スチレン系熱可塑性エラストマー、オレフィン系熱可塑性エラストマーなどを用いてもよい。中でも、ポリエステル系樹脂は強度や寸法安定性が高いため、より好ましく使用される。また、実用強度に影響の無い範囲において、少量のポリオレフィン、ポリアミド類、ポリウレタン類を添加しても良いし、同様に本発明の効果を阻害しない程度に、原着や、酸化チタン、紫外線吸収剤や、熱安定剤、酸化防止剤等の任意の添加剤が添加されても良い。 The resin constituting the ultrafine fiber nonwoven fabric layer (B) is mainly composed of a polyester-based resin, a polyamide-based resin, and the like from the viewpoint that the melting point is 180 ° C. or higher, the heat resistance is high, and the strength during drying is high. Copolymers and mixtures are preferably used. Examples of polyester resins include terephthalic acid such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate, aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, and naphthalene dicarboxylic acid, and ethylene glycol, diethylene glycol, 1,4-butanediol, Any polymer that is polymerized with a diol such as cyclohexanedimethanol may be used. The polyester may be a biodegradable resin, for example, an aliphatic polyester including polylactic acid. Examples of the polyamide-based resin include nylon 6, nylon 66, nylon 610, nylon 612, etc., and polycarbonate resin, modified polyphenylene ether resin, polyphenylene sulfide resin, polyimide resin, polyetherimide resin, polyarylate resin, fluorine-based resin. Resins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, and the like may be used. Of these, polyester resins are more preferably used because of their high strength and dimensional stability. In addition, a small amount of polyolefin, polyamide, and polyurethane may be added within a range that does not affect the practical strength. Similarly, to the extent that the effect of the present invention is not hindered, the raw material, titanium oxide, and ultraviolet absorber. Moreover, arbitrary additives, such as a heat stabilizer and antioxidant, may be added.
極細繊維の不織布層（Ｂ）と不織布層（Ａ）とを積層する方法は、既存のどのような方法を用いても構わないが、例えば、高速水流を噴射して三次元交絡させる方法や、粒子状又は繊維状の接着剤により一体化させる方法があるが、不織布層（Ａ）、極細繊維の不織布層（Ｂ）とも熱可塑性樹脂からなり、熱エンボスで一体化する方法が、不織布の引張強度と曲げ柔軟性を維持し、耐熱安定性を維持することができるため、好ましい。
熱圧着による積層不織布構造の固定は、不織布の表面積で５０％以下の熱エンボス加工を適用するか、もしくは三層積層ウェブの全面に熱カレンダー加工を適用することにより行うことができる。
エンボス柄は基本的には大きく影響しないが、エンボス面積は６〜５０％が好ましい。エンボス面積が６％未満の熱圧着加工では充分な布強力が得られず、５０％よりも大きいと、非部分圧着部分が少なくなり、同一目付の不織布であっても空隙量が少なくなる傾向となるので、好ましくない。ただし必要によっては、一体化がフラットロールによる加熱加圧により行われてもよい。
The method of laminating the nonwoven fabric layer (B) and the nonwoven fabric layer (A) of ultrafine fibers may be any existing method, for example, a method of three-dimensional entanglement by jetting a high-speed water stream, There is a method of integrating with a particulate or fibrous adhesive, but the nonwoven fabric layer (A) and the nonwoven fabric layer (B) of ultrafine fibers are both made of a thermoplastic resin and integrated by hot embossing. It is preferable because strength and bending flexibility can be maintained and heat stability can be maintained.
The laminated nonwoven fabric structure can be fixed by thermocompression bonding by applying a heat embossing of 50% or less by the surface area of the nonwoven fabric or by applying a heat calendering to the entire surface of the three-layer laminated web.
The embossed pattern basically does not greatly affect, but the embossed area is preferably 6 to 50%. With thermocompression bonding with an embossed area of less than 6%, sufficient fabric strength cannot be obtained. When the embossed area is greater than 50%, non-partly crimped portions are reduced, and the amount of voids tends to be reduced even with the same basis weight non-woven fabric. This is not preferable. However, if necessary, the integration may be performed by heating and pressing with a flat roll.
最も好ましいのは、不織布層（Ａ）としてスパンボンド不織布層、不織布層（Ｂ）としてメルトブロー不織布層、不織布層（Ａ）としてスパンボンド不織布層を順次製造し、積層してエンボスロール又は熱プレスロールで圧着する方法である。すなわち、熱可塑性合成樹脂を用いて少なくとも１層以上のスパンボンド不織布層をコンベア上に紡糸し、その上に熱可塑性合成樹脂を用いてメルトブロー法で、繊維径０．５〜５μｍの極細繊維の不織布層を少なくとも１層以上吹き付け、その後、熱可塑性合成樹脂を用いた熱可塑性合成繊維の不織布を少なくとも１層以上積層し、次いで、エンボスロール又はフラットロールを用いて圧着することにより一体化する方法が好ましい。 Most preferably, a spunbond nonwoven fabric layer as the nonwoven fabric layer (A), a melt blown nonwoven fabric layer as the nonwoven fabric layer (B), and a spunbond nonwoven fabric layer as the nonwoven fabric layer (A) are sequentially manufactured and laminated to an embossing roll or a hot press roll. It is the method of crimping with. That is, a spunbond nonwoven fabric layer of at least one layer is spun on a conveyor using a thermoplastic synthetic resin, and an ultrafine fiber having a fiber diameter of 0.5 to 5 μm is melt blown using a thermoplastic synthetic resin thereon. A method in which at least one non-woven fabric layer is sprayed, and then at least one non-woven fabric of thermoplastic synthetic fiber using a thermoplastic synthetic resin is laminated, and then integrated by pressure bonding using an embossing roll or a flat roll. Is preferred.
上記の方法を用いると、熱可塑性合成繊維の不織布層の上に、メルトブロー法による極細繊維の不織布層が直接吹き付けられるので、メルトブロー法による極細繊維を熱可塑性合成繊維の不織布層内に侵入させることができる。このようにして、メルトブロー法による極細繊維が熱可塑性合成繊維の不織布内に侵入して固定されることにより、積層不織布の構造自体の強度が向上するだけでなく、極細繊維の不織布層の外力による移動が生じにくくなるので層間剥離がし難くなる。また不織布層内の空隙の塊を極細繊維層により均一化することができる上、極細繊維層（Ｂ）が不織布全体の中間層に位置するために、極細繊維層（Ｂ）の両面に位置する不織布層（Ａ）内の、厚み方向に存在する空隙の塊を分割することもできる。 When the above method is used, the nonwoven fabric layer of the ultrafine fiber by the melt blow method is directly sprayed on the nonwoven fabric layer of the thermoplastic synthetic fiber, so that the ultra fine fiber by the melt blow method enters the nonwoven fabric layer of the thermoplastic synthetic fiber. Can do. In this way, the ultrafine fibers by the melt blow method penetrate into the nonwoven fabric of the thermoplastic synthetic fiber and are fixed, thereby not only improving the strength of the laminated nonwoven fabric structure itself but also by the external force of the nonwoven fabric layer of the ultrafine fibers. Since the movement is less likely to occur, delamination is difficult. Moreover, since the voids in the nonwoven fabric layer can be made uniform by the ultrafine fiber layer and the ultrafine fiber layer (B) is located in the intermediate layer of the entire nonwoven fabric, it is located on both sides of the ultrafine fiber layer (B). A lump of voids existing in the thickness direction in the nonwoven fabric layer (A) can also be divided.
また、上記の方法を用いると、熱可塑性合成樹脂の自己接着のみを接合力としているため、不純物が混入せず、ケーブルの絶縁層として用いた場合、接着成分の経時劣化等による強度低下の懸念がない。 In addition, when the above method is used, only the self-adhesion of the thermoplastic synthetic resin is used as the bonding force. Therefore, when impurities are not mixed and used as an insulating layer of the cable, there is a concern that the strength may decrease due to deterioration of the adhesive component over time. There is no.
上記の方法で、熱可塑性合成繊維の不織布層の上に、メルトブロー法による極細繊維を直接吹き付けて積層不織布とすることにより、メルトブロー法による極細繊維を熱可塑性合成繊維の不織布層内に侵入させることができ、さらに、熱圧着で接合一体化させることにより、極細繊維の侵入と、固定化が促進される。この様に、極細繊維が、熱可塑性合成繊維の不織布の繊維間隙を埋めるような作用をし、この構造を熱圧着によって固定化することにより、極めて特異な、繊維間隙を利用した開孔状態が得られる。本発明における不織布が特定の開孔径分布を持ち、ケーブル被覆用絶縁体として利用した時ケーブル線上の各位置での安定した電気特性を確保できる理由は、上記のような構造的な要因によるものと推定される。 By using the above method, the ultrafine fiber by the melt blow method is directly sprayed onto the nonwoven fabric layer of the thermoplastic synthetic fiber to form a laminated nonwoven fabric, thereby allowing the ultra fine fiber by the melt blow method to enter the nonwoven fabric layer of the thermoplastic synthetic fiber. In addition, by joining and integrating by thermocompression bonding, penetration of ultrafine fibers and fixation are promoted. In this way, the ultrafine fiber acts to fill the fiber gap of the thermoplastic synthetic nonwoven fabric, and by fixing this structure by thermocompression bonding, a very unique open state utilizing the fiber gap is obtained. can get. The reason why the non-woven fabric in the present invention has a specific aperture diameter distribution and can secure stable electrical characteristics at each position on the cable wire when used as an insulator for cable covering is due to the structural factors as described above. Presumed.
このような、スパンボンド不織布層に対するメルトブロー繊維層の侵入を制御するには、メルトブロー紡糸ノズルと熱可塑性合成繊維の堆積ウェブの捕集面との間の相対的な距離を１２ｃｍ前後に設定する方法や前記捕集面に作用する吸引力を高める方法を用いることが有効である。 In order to control the penetration of the meltblown fiber layer into the spunbond nonwoven fabric layer, a method of setting the relative distance between the meltblown spinning nozzle and the collecting surface of the thermoplastic synthetic fiber deposition web to be around 12 cm. It is also effective to use a method of increasing the suction force acting on the collection surface.
さらに、理由は明らかではないが、極細繊維であるメルトブロー繊維を構成する熱可塑性合成樹脂として、融点の高い樹脂を用いるほうが、熱可塑性合成繊維の不織布層により侵入し易いことが判明している。すなわち、極細繊維層に用いる樹脂として、ポリエチレンテレフタレート、ポリアミドなどの１８０℃以上の融点を有する樹脂が、本発明に適している。これは、高融点樹脂が、メルトブローの繊維化過程で、十分に結晶化しない状態で繊維間隙に流動的に侵入するためであると推定される。 Furthermore, although the reason is not clear, it has been found that the use of a resin having a high melting point as the thermoplastic synthetic resin constituting the melt-blown fiber, which is an ultrafine fiber, is more likely to enter the nonwoven fabric layer of the thermoplastic synthetic fiber. That is, as the resin used for the ultrafine fiber layer, a resin having a melting point of 180 ° C. or higher such as polyethylene terephthalate and polyamide is suitable for the present invention. It is presumed that this is because the high melting point resin fluidly enters the fiber gap in the state of not being sufficiently crystallized during the melt blowing fiberization process.
また、メルトブロー繊維の結晶化度が１５〜４０％であることは、接着性や侵入性が良好となるため、好ましい。ポリエステル樹脂の場合、溶液粘度（ηｓｐ／ｃ）が、好ましくは０．２〜０．８、より好ましくは０．２〜０．５であれば、一般的なメルトブロー紡糸条件下で、このような結晶化度に調整することがである。また、ポリアミド樹脂の場合、溶液比粘度（ηｒｅｌ）は、好ましくは１．８〜２．７、より好ましくは１．８〜２．２であり、かかる溶液比粘度（ηｒｅｌ）であれば、同様に上記結晶化度に調整である。 Moreover, since the adhesiveness and penetration | invasion property become favorable that the crystallinity degree of a meltblown fiber is 15 to 40%, it is preferable. In the case of a polyester resin, if the solution viscosity (ηsp / c) is preferably 0.2 to 0.8, more preferably 0.2 to 0.5, such a condition can be obtained under general melt blow spinning conditions. The crystallinity can be adjusted. In the case of polyamide resin, the solution specific viscosity (ηrel) is preferably 1.8 to 2.7, more preferably 1.8 to 2.2. The above crystallinity is adjusted.
一般的なポリプロピレンのメルトブロー繊維の結晶化度は約５０％程度であり、ポリエステルやポリアミドに比較して高い値を示す。これは、冷却過程による効果が大きいためであると考えられ、融点の高い樹脂の方が軟化し易く、侵入もし易いと推定される。 The crystallinity of a general polypropylene meltblown fiber is about 50%, which is higher than that of polyester or polyamide. This is considered to be because the effect of the cooling process is large, and it is presumed that a resin having a high melting point is easily softened and easily penetrated.
本発明においては、特に、湿潤時の寸法安定性に優れ、強度が高いことからポリエステル樹脂が好ましく使用され、メルトブロー繊維を構成する樹脂は、溶液粘度（ηｓｐ／ｃ）が０．２〜０．８のポリエステル樹脂が好ましく使用され、メルトブロー繊維の結晶化度は１５〜４０％とすることが好ましい。 In the present invention, a polyester resin is preferably used because of its excellent dimensional stability when wet and high strength, and the resin constituting the meltblown fiber has a solution viscosity (ηsp / c) of 0.2 to 0.00. No. 8 polyester resin is preferably used, and the crystallinity of the meltblown fiber is preferably 15 to 40%.
メルトブロー繊維の具体的な侵入の形態は、繊維単独でひげ状や絡みついた様な形状ではなく、複数の繊維の集合体として侵入している部分が形成されており、侵入した極細繊維の不織布層が熱可塑性合成繊維の一部を取り囲むように包埋又は交絡した配置をとり、また、その侵入したメルトブロー繊維の一部が熱可塑性合成繊維を接着している構造を、メルトブロー繊維と熱可塑性合成繊維の混和層として、全面に有する状態となっている。
本発明において、熱可塑性合成繊維不織布層（Ａ）への極細繊維不織布層（Ｂ）の進入の程度は、後述する方法に拠って測定される進入指数で評価する事が出来る。進入指数とは、相隣する熱可塑性合成繊維不織布層（Ａ）の繊維間（但し、３直径を超えない距離にあること）を埋める極細繊維不織布層（Ｂ）の深さの平均値（ｄ）を熱可塑性合成繊維不織布繊維層（Ａ）を構成する繊維の繊径（Ｄ）で割った、次式（２）で定義される値である。
換言すれば、進入指数とは、熱可塑性合成繊維不織布層（Ａ）を構成する繊維間に占める極細繊維の充填度での混和度合いを表す。したがって、本発明の積層不織布は、不織布構造上、極細繊維が進入指数で特定される充填度で混和した熱可塑性合成繊維不織布層（Ａ）を含む積層不織布構造に特徴をもっている。
一般に熱可塑性合成繊維不織布層（Ａ）としてスパンボンド法，極細繊維不織布層（Ｂ）としてメルトブロー法を用い、スパンボンド／メルトブロー／スパンボンドを順次積層してＡ／Ｂ／Ａ形不織布を製造する場合は、一方のＡ／Ｂ間の進入指数が多方のＡ／Ｂ間の進入指数より高い傾向がある。本発明では少なくとも一方のＡ／Ｂ間での進入指数０．３６以上で進入して極細繊維不織布層（Ｂ）と熱可塑性合成繊維不織布繊維層（Ａ）が混和している構造をもつ事が好ましい。より好しくは、進入指数が０．４以上である。
ここで、進入指数の算出は、エンボスの熱圧着で一体化された積層不織布の場合、エンボスされた部位を除いて行われる。熱エンボスされた部位を進入指数の評価の対象としない理由は、被熱圧着エンボス部分は、電子顕微鏡観察の結果から概ね、微細繊維と長繊維とが共に溶融乃至高圧下に融解して繊維構造が破壊され、その部位の断面形状の観察から、両者の混和程度の判別が困難であるからである。
The specific form of intrusion of the meltblown fibers is not a shape like a whisker or entanglement of the fibers alone, but a part intruding as an aggregate of a plurality of fibers is formed, and the nonwoven fabric layer of infiltrated ultrafine fibers Has a structure in which a part of the thermoplastic synthetic fiber is embedded or entangled so as to surround a part of the thermoplastic synthetic fiber, and a structure in which a part of the melt blown fiber that has intruded is bonded to the thermoplastic synthetic fiber As a mixed layer of fibers, it is in a state of having over the entire surface.
In the present invention, the degree of penetration of the ultrafine fiber nonwoven fabric layer (B) into the thermoplastic synthetic fiber nonwoven fabric layer (A) can be evaluated by an approach index measured by a method described later. The penetration index is an average value (d) of the ultrafine fiber nonwoven fabric layer (B) filling between the fibers of the adjacent thermoplastic synthetic fiber nonwoven fabric layers (A) (but at a distance not exceeding 3 diameters). ) Is divided by the fine diameter (D) of the fibers constituting the thermoplastic synthetic nonwoven fabric layer (A), and is a value defined by the following formula (2).
In other words, the penetration index represents the degree of mixing in the degree of filling of the ultrafine fibers that occupy between the fibers constituting the thermoplastic synthetic fiber nonwoven fabric layer (A). Therefore, the laminated nonwoven fabric of the present invention is characterized by a laminated nonwoven fabric structure including the thermoplastic synthetic fiber nonwoven fabric layer (A) in which the ultrafine fibers are mixed at a filling degree specified by the penetration index.
Generally, the spunbond method is used as the thermoplastic synthetic fiber nonwoven fabric layer (A) and the melt blown method is used as the ultrafine fiber nonwoven fabric layer (B), and the spunbond / meltblown / spunbond are sequentially laminated to produce an A / B / A type nonwoven fabric. In some cases, the approach index between one A / B tends to be higher than the approach index between many A / Bs. In the present invention, it has a structure in which an ultrafine fiber nonwoven fabric layer (B) and a thermoplastic synthetic fiber nonwoven fabric fiber layer (A) are mixed by entering at an entry index of 0.36 or more between at least one A / B. preferable. More preferably, the entry index is 0.4 or more.
Here, in the case of the laminated nonwoven fabric integrated by emboss thermocompression bonding, the approach index is calculated except for the embossed portion. The reason why the hot-embossed part is not subject to the evaluation of the penetration index is that the heat-bonded embossed part is generally a fiber structure in which fine fibers and long fibers are both melted or melted under high pressure from the results of electron microscope observation. This is because it is difficult to determine the degree of mixing between the two by observing the cross-sectional shape of the part.
本発明における積層不織布の空隙体積は、７０ｃｍ３／ｍ２以上５００ｃｍ３／ｍ２以下である必要があり、好ましくは１００ｃｍ３／ｍ２〜４００ｃｍ３／ｍ２、さらに好ましくは１５０ｃｍ３／ｍ２〜３００ｃｍ３／ｍ２である。空隙体積が７０ｃｍ３／ｍ２を下回ると、特性インピーダンスを高速デジタル信号の送信用・受信用ＩＣのインピーダンスと同じ１００Ωに設定することが難しくなり、一方、空隙体積が５００ｃｍ３／ｍ２を超えると、絶縁層として厚みが厚くなりすぎ、フレキシブルフラットケーブルとして用いた場合に、折り曲げた時に折り曲げ部が層間剥離し、不織布内に大きな空隙の塊を作ってしまうため、該当部分のインピーダンスが周辺部分と差を生じてしまいケーブルの性能が安定しない。 The void volume of the laminated nonwoven fabric in the present invention needs to be 70 cm 3 / m 2 or more and 500 cm 3 / m 2 or less, preferably 100 cm 3 / m 2 to 400 cm 3 / m 2 , more preferably 150 cm 3 / m 2. -300 cm < 3 > / m < 2 >. When the void volume is less than 70 cm 3 / m 2 , it becomes difficult to set the characteristic impedance to 100Ω, which is the same as the impedance of the high-speed digital signal transmission / reception IC, while the void volume exceeds 500 cm 3 / m 2 . And when the insulation layer becomes too thick and it is used as a flexible flat cable, the folded part will delaminate when folded, creating a large void mass in the nonwoven fabric, so the impedance of the corresponding part will be the peripheral part The cable performance is not stable.
以下、非制限的な実施例により本発明を具体的に説明する。
測定方法及び評価基準は次の通りである。
（１）目付（ｇ／ｍ２）
ＪＩＳ Ｌ−１９０６に規定の方法に従い、縦２０ｃｍ×横２５ｃｍの試験片を、試料の幅１ｍ当たり３箇採取して質量を測定し、その平均値を単位面積当たりの質量に換算して求めた。
Hereinafter, the present invention will be specifically described with reference to non-limiting examples.
The measurement method and evaluation criteria are as follows.
(1) basis weight (g / m 2)
In accordance with the method prescribed in JIS L-1906, three test pieces measuring 20 cm in length and 25 cm in width were sampled per 1 m width of the sample, the mass was measured, and the average value was calculated by converting to the mass per unit area. .
（２）厚み（μｍ）
ＪＩＳ Ｌ−１９０６に規定の方法に従い、幅１ｍ当たり１０箇所の厚みを測定し、その平均値を求めた。荷重は９．８ｋＰａで行った。
(2) Thickness (μm)
According to the method prescribed in JIS L-1906, the thickness of 10 locations per 1 m width was measured, and the average value was obtained. The load was 9.8 kPa.
（３）空隙体積（ｃｍ３／ｍ２）
不織布の目付、不織布を構成する物質の密度と不織布の厚みから、１ｍ２の不織布中に占める空隙量を空隙体積として計算した。すなわち、不織布の厚みをｔ（μｍ）、不織布の目付をＭ（ｇ／ｍ２）、不織布を構成する物質の密度をρ（ｇ／ｃｍ３）、空隙体積をＷｅ（ｃｍ３／ｍ２）とすると、以下の数式（３）：
From the basis weight of the nonwoven fabric, the density of the substances constituting the nonwoven fabric, and the thickness of the nonwoven fabric, the amount of voids in the 1 m 2 nonwoven fabric was calculated as the void volume. That is, the thickness of the nonwoven fabric is t (μm), the basis weight of the nonwoven fabric is M (g / m 2 ), the density of the material constituting the nonwoven fabric is ρ (g / cm 3 ), and the void volume is We (cm 3 / m 2 ). Then, the following formula (3):
（４）開孔径分布
ＰＭＩ社のパームポロメーター（型式：ＣＦＰ−１２００ＡＥＸ）を用いた。測定には、浸液にＰＭＩ社製のシルウィックを用い、試料を浸液に浸して充分に脱気し、測定した。
本測定装置を用いて、フィルターを、予め表面張力が既知の液体に浸し、フィルターの全ての細孔を液体の膜で覆った状態からフィルターに圧力をかけ、液膜の破壊される圧力と液体の表面張力から計算された細孔の孔径を測定する。計算には以下の数式（４）：
を用いる。
数式（４）より、液体に浸したフィルターにかける圧力Ｐを低圧から高圧に連続的に変化させた場合の流量（濡れ流量）を測定すると、初期の圧力は最も大きな細孔の液膜でも破壊されないので、流量は０である。圧力を上げていくと、最も大きな細孔の液膜が破壊され、流量が発生する（バブルポイント）。さらに圧力を上げていくと、各圧力に応じて流量は増加し、最も小さな細孔の液膜が破壊され、乾いた状態の流量（乾き流量）と一致する。
(4) Opening Diameter Distribution A palm porometer (model: CFP-1200AEX) manufactured by PMI was used. For the measurement, Sylwick made by PMI was used as the immersion liquid, and the sample was immersed in the immersion liquid and sufficiently deaerated to measure.
Using this measurement device, the filter is immersed in a liquid with a known surface tension in advance, and pressure is applied to the filter from a state in which all pores of the filter are covered with a liquid film. The pore diameter calculated from the surface tension is measured. The following formula (4) is used for the calculation:
Is used.
From Equation (4), when the flow rate (wetting flow rate) when the pressure P applied to the filter immersed in the liquid is continuously changed from low pressure to high pressure is measured, the initial pressure is broken even with the liquid film with the largest pores. The flow rate is zero. As the pressure is increased, the liquid film with the largest pores is destroyed and a flow rate is generated (bubble point). When the pressure is further increased, the flow rate increases in accordance with each pressure, and the liquid film with the smallest pores is destroyed, which coincides with the dry flow rate (dry flow rate).
上記測定装置では、ある圧力における濡れ流量を、同圧力での乾き流量で割った値を累積フィルター流量（単位：％）と呼ぶ。累積フィルター流量が５０％となる圧力で破壊される液膜の孔径を、平均流量孔径（μｍ）と定義する。
本発明での最大孔径（μｍ）は、累積フィルター流量が５０％の−２σの範囲、すなわち、累積フィルター流量が２．３％となる圧力で破壊される液膜の孔径とした。
In the measuring apparatus, a value obtained by dividing the wetting flow rate at a certain pressure by the dry flow rate at the same pressure is called a cumulative filter flow rate (unit:%). The pore diameter of the liquid film that is broken at a pressure at which the cumulative filter flow rate is 50% is defined as the average flow pore size (μm).
The maximum pore diameter (μm) in the present invention is a pore diameter of a liquid film that is broken at a pressure where the cumulative filter flow rate is −2σ, ie, the cumulative filter flow rate is 2.3%.
（５）繊維径（μｍ）
繊維ウェブ、不織布などの布帛の両端部１０ｃｍを除き、幅２０ｃｍ毎の区域からそれぞれ１ｃｍ角の試験片を切り取って試料とした。各試料について、マイクロスコープで繊維の直径を３０点測定し、測定値の平均値（小数点第２位を四捨五入）を算出して、試料を構成する繊維の繊維径とした。
(5) Fiber diameter (μm)
Except for 10 cm at both ends of a fabric such as a fiber web and a non-woven fabric, 1 cm square test pieces were cut out from areas of every 20 cm width to prepare samples. For each sample, the diameter of the fiber was measured with a microscope at 30 points, and the average value of the measured values (rounded to the first decimal place) was calculated as the fiber diameter of the fibers constituting the sample.
（６）進入指数
エタノールを含浸させてから液体窒素凍結した積層不織布試料から不織布のＣＤ方向断面を剃刀で切断し、マイクロスコープを用いて、１５００倍程度映像を記録して以下の基準で長繊維層へのメルトブロー微細繊維層の進入状態を分別した。
ａ．微細繊維層の長繊維層への進入を分別することができない、エンボスロールでの熱圧着で一体化した不織布のエンボス部分は、進入指数の測定、算出からは除く。一般に微細繊維の進入のない部分の極細繊維不織布層(Ｂ)と熱可塑性合成繊維不織布層（Ａ）との界面は明確に特定することができないので、熱可塑性合成繊維不織布層（Ａ）を構成する２つの隣接する繊維の間に極細繊維層（Ｂ）を含んでいる１組の繊維の組み合わせを抽出する。但し、抽出した各組に含まれる２つの熱可塑性合成繊維間の距離は、熱可塑性合成繊維の直径の三倍を超えないものとする。抽出した各組に含まれる２つの熱可塑性合成長繊維の接線を極細繊維不織布層（Ｂ）側に引く。
ｂ．この各接線を基準線として、各２繊維間に進入している極細繊維不織布層の基準線から最も離れている部位までの距離を求めこれを進入深さ抽出して、各組の進入深さを測定し、幅方向での平均値を求めて、２つの繊維間における微細繊維の進入深さの平均値（ｄ）（μｍ）とする。但し、抽出された各２長繊維間に進入している微細繊維の進入深さが、無限大になるのを防ぐ為、抽出した２長繊維のうち、極細繊維不織布層（Ｂ）に近い方と熱可塑性合成繊維不織布層（Ａ）最外部との距離（ｄｃ）と進入深さを比較して、進入深さがｄｃの１．４１倍以上になっている場合は、その２長繊維の組み合わせでの進入深さを、ｄｃの１．４１倍の値とする。長繊維の直径（Ｄ）（μｍ）は、繊径の測定方法により求める。そして、次式により進入指数を算出（小数点第３位４捨５入）する。
a. The embossed portion of the nonwoven fabric integrated by thermocompression bonding with an embossing roll that cannot separate the entry of the fine fiber layer into the long fiber layer is excluded from the measurement and calculation of the entry index. In general, the interface between the ultrafine fiber nonwoven fabric layer (B) and the thermoplastic synthetic fiber nonwoven fabric layer (A) where the fine fiber does not enter cannot be clearly specified, so the thermoplastic synthetic fiber nonwoven fabric layer (A) is constructed. A pair of fibers including a fine fiber layer (B) between two adjacent fibers is extracted. However, the distance between the two thermoplastic synthetic fibers included in each extracted set shall not exceed three times the diameter of the thermoplastic synthetic fibers. The tangent line of two thermoplastic synthetic long fibers contained in each extracted set is drawn to the ultrafine fiber nonwoven fabric layer (B) side.
b. Using each tangent as a reference line, the distance from the reference line of the ultra-fine fiber nonwoven fabric layer that has entered between each two fibers to the farthest part is obtained, and this is extracted to determine the entry depth of each set. Is measured, and the average value in the width direction is obtained to obtain the average value (d) (μm) of the penetration depth of the fine fibers between the two fibers. However, in order to prevent the infiltration depth of fine fibers entering between each extracted two long fibers from becoming infinite, one of the extracted two long fibers closer to the ultrafine fiber nonwoven fabric layer (B) And the thermoplastic synthetic fiber nonwoven fabric layer (A), the distance (dc) between the outermost part and the penetration depth, and when the penetration depth is 1.41 times or more of dc, The approach depth in combination is set to a value 1.41 times dc. The diameter (D) (μm) of the long fiber is determined by a method for measuring the fine diameter. Then, the entry index is calculated by the following formula (decimal point is rounded to 4).
（７）耐表面摩耗性
縦２．５ｃｍ×横３０ｃｍの試験片を、試料の幅１ｍ当たり３箇採取して学振摩耗型試験機に取り付け３０回摩擦し、表面状態を観察し、以下の格付けで評価した：
〇：変化なし又は横から見ると糸が数本浮いている
△：摩擦部分が毛羽立っている
×：摩擦部分に糸のよれ（ピリング）が見られる
(7) Surface abrasion resistance Three test pieces measuring 2.5 cm in length x 30 cm in width were sampled per 1 m width of the sample and attached to a Gakushin abrasion type tester and rubbed 30 times. Rated by rating:
◯: No change or several threads floating when viewed from the side △: Friction part is fluffy ×: Yarn pilling is seen in the friction part
（８）耐層間剥離性
２０ｃｍ各の試験片を、試料の幅１ｍ当たり３箇所採取して対角線で二つに１８０°まで折り曲げ、元の形に戻す操作を３回繰返した後、折り曲げ線部分を観察し、以下の格付けで評価した：
〇：折り曲げ部分のエンボスは、折り曲げ部以外の部分のエンボスと外観の変化がないか、又は折り曲げ部に節が見られない。
×：折り曲げ部分のエンボスの色が折り曲げ部以外の部分のエンボスより色が薄く見えるか、又は折り曲げ部が層間剥離し節が見られる。
(8) Delamination resistance After removing the test piece of 20cm 3 points per 1m width of the sample, bending it diagonally to 180 ° in two and returning it to its original shape three times, the bending line part Were evaluated with the following ratings:
◯: The embossment of the bent portion has no change in appearance from the embossed portion other than the bent portion, or no node is seen in the bent portion.
X: The color of the embossed part of the bent part looks lighter than the embossed part of the part other than the bent part, or the bent part is delaminated and a node is seen.
［実施例１］
汎用的なポリエチレンテレフタレート（ＰＥＴ）をスパンボンド法により、紡糸温度３００℃でフィラメントの長繊維群を移動捕集面に向けて押し出し、紡糸速度３５００ｍ／分で紡糸し、コロナ帯電で３μＣ／ｇ程度帯電させて、充分に開繊し、平均繊経１６μｍフィラメントからなる、５ｃｍ変動率１５％以下の均一性の、目付１２．５ｇ／ｍ２の未結合長繊維ウェブを、捕集ネット面上に、調製した（不織布層Ａ）。
[Example 1]
General-purpose polyethylene terephthalate (PET) is spunbonded at a spinning temperature of 300 ° C, and the filament filaments are extruded toward the moving collection surface, spun at a spinning speed of 3500 m / min, and charged at a corona charge of about 3 µC / g. An unbonded long fiber web having a weight per unit area of 12.5 g / m 2 and having a uniformity of 5 cm fluctuation rate of 15% or less and comprising a filament having a mean diameter of 16 μm and fully opened by charging is formed on the surface of the collection net. Prepared (nonwoven fabric layer A).
一方、ポリエチレンテレフタレート（溶融粘度０．５０ηｓｐ／ｃ）を、紡糸温度３００℃、加熱エア温度３２０℃、吐出エア１０００Ｎｍ３／ｈｒ／ｍの条件下でメルトブロー法にて紡糸して、平均繊維径１．６μｍの極細繊維を目付５ｇ／ｍ２のランダムウエブとして、上記のように形成された長繊維ウェブに向けて直に噴出させた（極細繊維層Ｂ）。この際のメルトブローノズルから長繊維ウェブ上面までの距離は１００ｍｍに、そしてメルトブローノズル直下の捕集面における吸引を０．２ｋＰａ、風速約７ｍ／ｓｅｃに設定した。 On the other hand, polyethylene terephthalate (melt viscosity 0.50 ηsp / c) was spun by a melt blow method under conditions of a spinning temperature of 300 ° C., a heating air temperature of 320 ° C., and a discharge air of 1000 Nm 3 / hr / m. .6 μm ultrafine fibers were spouted as a random web having a basis weight of 5 g / m 2 toward the long fiber web formed as described above (ultrafine fiber layer B). At this time, the distance from the melt blow nozzle to the upper surface of the long fiber web was set to 100 mm, and the suction on the collecting surface immediately below the melt blow nozzle was set to 0.2 kPa and the wind speed was set to about 7 m / sec.
次いで、ポリエチレンテレフタレートの長繊維ウェブを、最初に調製した不織布層（Ａ）と同様にして開繊し、直にＡ／Ｂ／Ａからなる三層積層ウェブを調製した。得られた三層積層ウェブをエンボスロールとフラットロールの間に通して熱圧着させ、積層不織布を得た。熱圧着加工におけるエンボスロールの面積率は２５％であった。 Subsequently, the long fiber web of polyethylene terephthalate was opened in the same manner as the nonwoven fabric layer (A) prepared first, and a three-layer laminated web consisting of A / B / A was prepared directly. The obtained three-layer laminated web was passed between an embossing roll and a flat roll and thermocompression bonded to obtain a laminated nonwoven fabric. The area ratio of the embossing roll in the thermocompression processing was 25%.
該不織布の構成及び性能を、以下の表１に示す。
表１に示すように、本発明に係る積層不織布は、開孔径が小さく、耐表面摩耗性、耐層間剥離性の良好な不織布であることがわかる。本不織布をフレキシブルフラットケーブル上に貼り合わせ、アルミ蒸着ＰＥＴフィルムを巻いてインピーダンスを評価したところ、安定した値が得られた。 As shown in Table 1, it can be seen that the laminated nonwoven fabric according to the present invention is a nonwoven fabric having a small opening diameter and good surface abrasion resistance and delamination resistance. When this nonwoven fabric was bonded on a flexible flat cable, an aluminum vapor-deposited PET film was wound and impedance was evaluated, a stable value was obtained.
［実施例２〜４、６〜８］
不織布の構成を表１の通りとした以外は、実施例１と同様にして不織布を得た。表１に示すように、実施例２〜４、及び６〜８においても、開孔径が小さく、耐表面摩耗性、耐層間剥離性の良好な不織布が得られた。本不織布をフレキシブルフラットケーブル上に貼り合わせ、アルミ蒸着ＰＥＴフィルムを巻いてインピーダンスを評価したところ、安定した値が得られた。
[Examples 2 to 4, 6 to 8]
A nonwoven fabric was obtained in the same manner as in Example 1 except that the configuration of the nonwoven fabric was as shown in Table 1. As shown in Table 1, also in Examples 2 to 4 and 6 to 8, nonwoven fabrics having small pore diameters and excellent surface abrasion resistance and delamination resistance were obtained. When this nonwoven fabric was bonded on a flexible flat cable, an aluminum vapor-deposited PET film was wound and impedance was evaluated, a stable value was obtained.
［実施例９］
汎用的なポリエチレンテレフタレートをスパンボンド法により、紡糸温度３００℃でフィラメントの長繊維群を移動捕集面に向けて押し出し、紡糸速度３５００ｍ／分で紡糸し、コロナ帯電で３μＣ／ｇ程度帯電させて、充分に開繊し、平均繊経１６μｍフィラメントからなる、５ｃｍ変動率１５％以下の均一性の、目付４０ｇ／ｍ２の未結合長繊維ウェブを、捕集ネット面上に調製した（不織布層Ａ）。
[Example 9]
A general-purpose polyethylene terephthalate is extruded by spunbonding at a spinning temperature of 300 ° C. and a filament group of filaments is extruded toward the moving collection surface, and is spun at a spinning speed of 3500 m / min. A non-bonded long fiber web having a weight per unit area of 16 g / m 2 and a uniformity of 5 cm variation rate of 15% or less was prepared on the surface of the collection net. A).
一方、ポリエチレンテレフタレート（溶融粘度０．５０ηｓｐ／ｃ）を、紡糸温度３００℃、加熱エア温度３２０℃、吐出エア１０００Ｎｍ３／ｈｒ／ｍの条件下でメルトブロー法にて紡糸して、平均繊維径１．６μｍの極細繊維を目付３０ｇ／ｍ２のランダムウエブとして、上記のように形成された長繊維ウェブに向けて直に噴出させた（極細繊維層Ｂ）。この際のメルトブローノズルから長繊維ウェブ上面までの距離は１００ｍｍとし、そしてメルトブローノズル直下の捕集面における吸引を０．２ｋＰａ、風速約７ｍ／ｓｅｃに設定して、長繊維ウェブ／メルトブローウェブからなる二層積層ウェブを調製した。 On the other hand, polyethylene terephthalate (melt viscosity 0.50 ηsp / c) was spun by a melt blow method under conditions of a spinning temperature of 300 ° C., a heating air temperature of 320 ° C., and a discharge air of 1000 Nm 3 / hr / m. .6 μm ultrafine fibers were spouted as a random web having a basis weight of 30 g / m 2 toward the long fiber web formed as described above (ultrafine fiber layer B). At this time, the distance from the melt blow nozzle to the upper surface of the long fiber web is 100 mm, and the suction on the collecting surface immediately below the melt blow nozzle is set to 0.2 kPa and the wind speed is set to about 7 m / sec. A bilayer laminated web was prepared.
次いで、該積層ウェブをエンボスロールとフラットロールの間に通して熱圧着させ、積層不織布を得た。熱圧着加工におけるエンボスロールの面積率は２３％であった。表１に示すように、開孔径が小さく、耐表面摩耗性、耐層間剥離性の良好な不織布が得られた。本不織布をフレキシブルフラットケーブル上に貼り合わせ、アルミ蒸着ＰＥＴフィルムを巻いてインピーダンスを評価したところ、安定した値が得られた。 Next, the laminated web was passed between an embossing roll and a flat roll and thermocompression bonded to obtain a laminated nonwoven fabric. The area ratio of the embossing roll in the thermocompression processing was 23%. As shown in Table 1, a non-woven fabric having a small hole diameter and good surface abrasion resistance and delamination resistance was obtained. When this nonwoven fabric was bonded on a flexible flat cable, an aluminum vapor-deposited PET film was wound and impedance was evaluated, a stable value was obtained.
［実施例５］
汎用的なナイロン６（Ｎｙ）をスパンボンド法により、紡糸温度２６５℃でフィラメントの長繊維群を移動捕集面に向けて押し出し紡糸し、コロナ帯電で６μｃ／ｇ程度の帯電をさせて、充分に開繊し、平均繊維径１５μｍのフィラメントからなる、５ｃｍ目付変動率１５％以下の目付２９ｇ／ｍ２の未結合ウェブを、捕集ネット上に調製した（不織布層Ａ）。
[Example 5]
General-purpose nylon 6 (Ny) is spunbonded at a spinning temperature of 265 ° C., and the filament long fiber group is extruded and spun toward the moving collection surface, and charged by about 6 μc / g by corona charging. A non-bonded web having a basis weight of 29 g / m 2 having a basis weight variation of 15% or less and comprising a filament having an average fiber diameter of 15 μm was prepared on the collection net (nonwoven fabric layer A).
一方、ナイロン６（溶液相対粘度ηｒｅｌ：２．１）を用い、公知のメルトブロー法により、紡糸温度２７０℃、加熱エア３２０℃、１１００Ｎｍ３／ｈｒ／ｍで、平均繊維径１．８μｍで１２ｇ／ｍ２になるように吐出し（極細繊維不織布層Ｂ）、更にナイロン６のスパンボンドウェブを最初のウェブと同様に、２９ｇ／ｍ２をメルトブロー上に積層して、Ａ／Ｂ／Ａでなる三層積層ウェブを調製し、該積層ウェブをエンボスロールとフラットロールの間に通して熱圧着させ、積層不織布を得た。熱圧着加工は、エンボスロールはマイナス柄、面積率１１％であった。表１に示すように、開孔径が小さく、耐表面摩耗性、耐層間剥離性の良好な不織布が得られた。本不織布をフレキシブルフラットケーブル上に貼り合わせ、アルミ蒸着ＰＥＴフィルムを巻いてインピーダンスを評価したところ、安定した値が得られた。 On the other hand, nylon 6 (solution relative viscosity ηrel: 2.1) was used, and a known melt blow method, spinning temperature 270 ° C., heated air 320 ° C., 1100 Nm 3 / hr / m, average fiber diameter 1.8 μm, 12 g / discharged such that m 2 (microfibrous non-woven fabric layer B), as with further spunbonded web of nylon 6 first web, by laminating a 29 g / m 2 on meltblown, consisting of a / B / a A three-layer laminated web was prepared, and the laminated web was passed between an embossing roll and a flat roll and thermocompression bonded to obtain a laminated nonwoven fabric. In the thermocompression bonding, the embossing roll had a negative pattern and an area ratio of 11%. As shown in Table 1, a non-woven fabric having a small hole diameter and good surface abrasion resistance and delamination resistance was obtained. When this nonwoven fabric was bonded on a flexible flat cable, an aluminum vapor-deposited PET film was wound and impedance was evaluated, a stable value was obtained.
［比較例１］
目付、不織布層（Ａ）の目付、極細繊維層（Ｂ）の目付を表１の通りとした以外は実施例１と同様にして不織布を得た。表１に示すように、空隙体積、厚みが小さく、平均流量孔径、最大孔径が大きな不織布になってしまい、本不織布をフレキシブルフラットケーブル上に貼り合わせ、アルミ蒸着ＰＥＴフィルムを巻いてインピーダンスを評価したところ、安定した値が得られなかった。
[Comparative Example 1]
A nonwoven fabric was obtained in the same manner as in Example 1 except that the basis weight, the basis weight of the nonwoven fabric layer (A), and the basis weight of the ultrafine fiber layer (B) were as shown in Table 1. As shown in Table 1, the void volume and thickness were small, the average flow pore size and the maximum pore size were large, and the nonwoven fabric was bonded onto a flexible flat cable, and the impedance was evaluated by winding an aluminum-deposited PET film. However, a stable value was not obtained.
［比較例２］
不織布層（Ａ）の繊維径、目付を表１の通りとし、極細繊維層（Ｂ）を有さない不織布を得た。表１に示すように、平均流量孔径、最大孔径が大きく、また耐層間剥離性の低い不織布となってしまい、本不織布をフレキシブルフラットケーブル上に貼り合わせ、アルミ蒸着ＰＥＴフィルムを巻いてインピーダンスを評価したところ、安定した値が得られなかった。
[Comparative Example 2]
The fiber diameter and basis weight of the nonwoven fabric layer (A) were as shown in Table 1, and a nonwoven fabric without an ultrafine fiber layer (B) was obtained. As shown in Table 1, the nonwoven fabric has a large average flow pore size and maximum pore size and low delamination resistance, and this nonwoven fabric is bonded onto a flexible flat cable, and the impedance is evaluated by winding an aluminum-deposited PET film. As a result, stable values could not be obtained.
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| JP2011204503A (en) * | 2010-03-26 | 2011-10-13 | Hitachi Cable Fine Tech Ltd | Flexible flat cable |
| JP2012128991A (en) * | 2010-12-14 | 2012-07-05 | Totoku Electric Co Ltd | Flexible flat cable |
| JP2012182113A (en) * | 2011-02-08 | 2012-09-20 | Hitachi Cable Fine Tech Ltd | Flexible flat cable |
| CN103187125A (en) * | 2011-12-27 | 2013-07-03 | 日立电线精密技术株式会社 | Flexible flat cable |
| JP2014017164A (en) * | 2012-07-10 | 2014-01-30 | Dainippon Printing Co Ltd | Coating material for flexible flat cable |
| JP2014017163A (en) * | 2012-07-10 | 2014-01-30 | Dainippon Printing Co Ltd | Coating material for flexible flat cable |
| WO2015147119A1 (en) * | 2014-03-27 | 2015-10-01 | 大紀商事株式会社 | Nonwoven fabric sheet, and extraction-use filter and extraction-use bag using same |
| JP2018082512A (en) * | 2016-11-14 | 2018-05-24 | 国立研究開発法人産業技術総合研究所 | Multilayer actuator |
| WO2020004007A1 (en) * | 2018-06-25 | 2020-01-02 | 東レ株式会社 | Spunbond nonwoven fabric for use in filters, and manufacturing method thereof |
| JP7479356B2 (en) | 2019-04-26 | 2024-05-08 | クラレクラフレックス株式会社 | Fiber laminate and manufacturing method thereof |
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| JP2011204503A (en) * | 2010-03-26 | 2011-10-13 | Hitachi Cable Fine Tech Ltd | Flexible flat cable |
| JP2012128991A (en) * | 2010-12-14 | 2012-07-05 | Totoku Electric Co Ltd | Flexible flat cable |
| JP2012182113A (en) * | 2011-02-08 | 2012-09-20 | Hitachi Cable Fine Tech Ltd | Flexible flat cable |
| CN103187125A (en) * | 2011-12-27 | 2013-07-03 | 日立电线精密技术株式会社 | Flexible flat cable |
| JP2014017164A (en) * | 2012-07-10 | 2014-01-30 | Dainippon Printing Co Ltd | Coating material for flexible flat cable |
| JP2014017163A (en) * | 2012-07-10 | 2014-01-30 | Dainippon Printing Co Ltd | Coating material for flexible flat cable |
| WO2015147119A1 (en) * | 2014-03-27 | 2015-10-01 | 大紀商事株式会社 | Nonwoven fabric sheet, and extraction-use filter and extraction-use bag using same |
| JP5933149B2 (en) * | 2014-03-27 | 2016-06-08 | 大紀商事株式会社 | Nonwoven fabric sheet, extraction filter and extraction bag using the same |
| CN106164354A (en) * | 2014-03-27 | 2016-11-23 | 大纪商事株式会社 | Non-woven fabric plate and the extraction filter and the extraction bag that use it |
| US9732453B2 (en) | 2014-03-27 | 2017-08-15 | Ohki Co., Ltd. | Nonwoven fabric sheet, and extraction filter and extraction bag using the same |
| JP2018082512A (en) * | 2016-11-14 | 2018-05-24 | 国立研究開発法人産業技術総合研究所 | Multilayer actuator |
| WO2020004007A1 (en) * | 2018-06-25 | 2020-01-02 | 東レ株式会社 | Spunbond nonwoven fabric for use in filters, and manufacturing method thereof |
| CN112261982A (en) * | 2018-06-25 | 2021-01-22 | 东丽株式会社 | Spunbonded nonwoven fabric for filter and manufacturing method thereof |
| JP7479356B2 (en) | 2019-04-26 | 2024-05-08 | クラレクラフレックス株式会社 | Fiber laminate and manufacturing method thereof |
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