JP4383236B2 - Manufacturing method of composite sheet - Google Patents
Manufacturing method of composite sheet Download PDFInfo
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- JP4383236B2 JP4383236B2 JP2004125482A JP2004125482A JP4383236B2 JP 4383236 B2 JP4383236 B2 JP 4383236B2 JP 2004125482 A JP2004125482 A JP 2004125482A JP 2004125482 A JP2004125482 A JP 2004125482A JP 4383236 B2 JP4383236 B2 JP 4383236B2
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- polyethylene
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- film
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- 239000002131 composite material Substances 0.000 title claims description 84
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- -1 polyethylene Polymers 0.000 claims description 104
- 239000004698 Polyethylene Substances 0.000 claims description 99
- 229920000573 polyethylene Polymers 0.000 claims description 99
- 239000000835 fiber Substances 0.000 claims description 84
- 239000004745 nonwoven fabric Substances 0.000 claims description 45
- 238000002844 melting Methods 0.000 claims description 26
- 230000008018 melting Effects 0.000 claims description 26
- 229920000728 polyester Polymers 0.000 claims description 20
- 239000002685 polymerization catalyst Substances 0.000 claims description 16
- 238000009987 spinning Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000010030 laminating Methods 0.000 claims description 6
- 235000013399 edible fruits Nutrition 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 229920001684 low density polyethylene Polymers 0.000 claims description 3
- 239000004702 low-density polyethylene Substances 0.000 claims description 3
- 239000002362 mulch Substances 0.000 claims description 3
- 239000005022 packaging material Substances 0.000 claims description 3
- 239000004566 building material Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 230000035699 permeability Effects 0.000 description 10
- 230000001788 irregular Effects 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000002074 melt spinning Methods 0.000 description 6
- 239000000945 filler Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 238000004049 embossing Methods 0.000 description 3
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920013716 polyethylene resin Polymers 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002781 deodorant agent Substances 0.000 description 2
- 239000002274 desiccant Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012766 organic filler Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241001672694 Citrus reticulata Species 0.000 description 1
- XGIAHMUOCFHQTI-UHFFFAOYSA-N Cl.Cl.Cl.Cl.CC Chemical compound Cl.Cl.Cl.Cl.CC XGIAHMUOCFHQTI-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000012773 agricultural material Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920005678 polyethylene based resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Landscapes
- Laminated Bodies (AREA)
- Multicomponent Fibers (AREA)
- Protection Of Plants (AREA)
- Greenhouses (AREA)
- Panels For Use In Building Construction (AREA)
- Wrappers (AREA)
Description
本発明は不織布と微多孔性フィルムとを貼合せる複合シートの製造方法に関するものである。 The present invention relates to a method for manufacturing a composite sheet thereby bonding the nonwoven fabric and microporous film.
従来より、透湿性及び耐水性に優れた微多孔性フィルムが種々開発されており、果樹用マルチ等の農業資材や、鮮度保持剤，除湿剤，乾燥剤，脱臭剤，芳香剤等の包装材、建築物の結露を防止する建築用シート等として使用されている。また、このような微多孔性フィルムは、補強のために織物や不織布等の補強用シートを熱融着により貼合した複合シートの形態で各種用途に用いられている。 Conventionally, various microporous films with excellent moisture permeability and water resistance have been developed. Agricultural materials such as fruit mulch, packaging materials such as freshness-keeping agents, dehumidifying agents, desiccants, deodorants, and fragrances. It is used as an architectural sheet that prevents condensation in buildings. Moreover, such a microporous film is used for various uses in the form of a composite sheet in which reinforcing sheets such as woven fabrics and nonwoven fabrics are bonded by thermal fusion for reinforcement.
熱融着性を有する不織布としては、芯部がポリエステルで鞘部がポリエチレンで構成された芯鞘型複合長繊維よりなる不織布が知られている（特許文献１）。この不織布は、芯部が高融点のポリエステルで鞘部が低融点のポリエチレンからなる芯鞘型複合長繊維で構成されているので、この不織布と他の基材などとを積層して、加熱及び所望により加圧すると、鞘部のポリエチレンのみが軟化又は溶融して、他の基材に熱融着するというものである。また、鞘部を構成するポリエチレンとしては、一般に融点１３０℃程度のものが多く用いられている。 As a non-woven fabric having heat-fusibility, a non-woven fabric made of a core-sheath type composite long fiber having a core part made of polyester and a sheath part made of polyethylene is known (Patent Document 1). This non-woven fabric is composed of core-sheath type composite continuous fiber whose core portion is made of polyester having a high melting point and whose sheath portion is made of polyethylene having a low melting point. When pressurized as desired, only the sheath polyethylene is softened or melted and thermally fused to another substrate. In general, polyethylene having a melting point of about 130 ° C. is often used as the polyethylene constituting the sheath.
上記熱融着性を有する不織布と、微多孔性フィルムとを貼合して複合シートを得ようとする際、微多孔性フィルムを構成する素材は、不織布を構成する鞘部のポリエチレンとの相溶性に優れることから同種のポリエチレンを選択することが望ましい。しかし、鞘部のポリエチレンを溶融または軟化させるために１３０℃以上の熱処理温度を施すと、接着成分となる鞘部を構成するポリエチレンと、微多孔性フィルムを構成するポリエチレンとが、同種の素材であるため、この熱処理により微多孔性フィルムが、著しく熱収縮したり、接着面が歪んだりして、得られる複合シートは、フィルムの収縮により見栄えが悪く、微多孔性を備えた状態で良好に接着できたとはいえない。また、熱処理温度を下げると、両者の接着力が弱くなるという問題がある。 When trying to obtain a composite sheet by laminating the above-mentioned non-woven fabric having heat-fusibility and a microporous film, the material constituting the microporous film is a phase with polyethylene in the sheath portion constituting the non-woven fabric. It is desirable to select the same kind of polyethylene because of its excellent solubility. However, when a heat treatment temperature of 130 ° C. or higher is applied to melt or soften the polyethylene in the sheath, the polyethylene constituting the sheath that becomes an adhesive component and the polyethylene constituting the microporous film are the same type of material. Therefore, the heat treatment of the microporous film due to this heat treatment, or the adhesive surface is distorted, the resulting composite sheet does not look good due to the shrinkage of the film, it is good in a state with microporosity It cannot be said that it was able to adhere. Further, when the heat treatment temperature is lowered, there is a problem that the adhesive force between the two becomes weak.
本発明は、上記問題を解決し、微多孔性フィルムが微多孔構造を保持した状態で、不織布と貼り合わされてなる複合シートを提供することを課題とするものである。 This invention solves the said problem, and makes it a subject to provide the composite sheet bonded together with a nonwoven fabric in the state in which the microporous film hold | maintained the microporous structure.
本発明者らは、不織布の熱接着性を改良するために、ポリエチレンの融点を低くする研究を行っていたところ、特定のポリエチレンを採用すると、従来の典型的な芯鞘型複合長繊維とは、その形態の異なるもの、すなわち、芯鞘型複合長繊維の表面（鞘部の表面）に不規則な凹凸を持つ複合長繊維を得ることを見出し、本出願人は、特願２００２−３０３４１４号に前記複合長繊維からなる不織布および不織布と他の基材とを貼合してなる複合材料を提案している。さらに、このような特定の形態を有する不織布と微多孔性フィルムとを貼合すると、微多孔性フィルムが有する微多孔構造を保持した状態で貼り合わせることができることを見出し、本発明に到達した。 In order to improve the thermal adhesiveness of the nonwoven fabric, the present inventors have conducted research to lower the melting point of polyethylene. When a specific polyethylene is used, what is a conventional typical core-sheath type composite continuous fiber? The present inventors have found that composite long fibers having irregular irregularities on the surface of the core-sheath type composite long fiber (surface of the sheath part) are obtained, and the applicant of the present application is Japanese Patent Application No. 2002-303414. Have proposed non-woven fabrics composed of the above-mentioned composite long fibers and composite materials obtained by bonding non-woven fabrics and other base materials. Furthermore, when the nonwoven fabric which has such a specific form, and a microporous film are bonded together, it discovered that it could bond together in the state which maintained the microporous structure which a microporous film has, and reached | attained this invention.
すなわち、本発明は、ポリエステルと、メタロセン系重合触媒により得られた第一ポリエチレンとチーグラーナッタ系重合触媒により得られた第二ポリエチレンとが混合されたポリエチレンとを、該ポリエステルが芯に配され、該ポリエチレンが鞘に配されるように、芯鞘型複合紡糸孔に供給し、溶融紡糸して、
芯部が該ポリエステルで鞘部が該ポリエチレンで構成され、芯部の横断面形状は繊維軸方向において実質的に変化せず、鞘部の厚さは、繊維軸方向及び繊維周方向において不均一で且つ無作為に変化している芯鞘状複合長繊維を得た後、該芯鞘状複合長繊維を集積して不織布を得、
該不織布と微多孔性ポリエチレンフィルムとを積層し、微多孔性ポリエチレンフィルムが当接している不織布面の芯鞘状複合長繊維の鞘部を軟化または溶融させることによって、該不織布と微多孔性ポリエチレンフィルムとを貼合することを特徴とする複合シートの製造方法を要旨とするものである。なお、本発明は、特願２００２−３０３４１４号に記載の発明を利用するものである。
That is, the present invention is a polyester, a polyethylene obtained by mixing the first polyethylene obtained by the metallocene polymerization catalyst and the second polyethylene obtained by the Ziegler-Natta polymerization catalyst, the polyester is arranged in the core, Supply the core-sheath type compound spinning hole so that the polyethylene is arranged in the sheath, melt-spin,
The core is composed of the polyester and the sheath is composed of the polyethylene. The cross-sectional shape of the core is not substantially changed in the fiber axis direction, and the thickness of the sheath is not uniform in the fiber axis direction and the fiber circumferential direction. And after obtaining a core-sheath-like composite long fiber that is randomly changing, the core-sheath- like composite long fiber is accumulated to obtain a nonwoven fabric,
Laminating a nonwoven fabric and a microporous polyethylene film, by softening or melting the sheath of the core sheath composite long fibers of the nonwoven fabric surface microporous polyethylene film is in contact with, the nonwoven fabric and the microporous polyethylene The gist of the present invention is a method for producing a composite sheet , which comprises pasting a film . The present invention uses the invention described in Japanese Patent Application No. 2002-303414.
以下、本発明について詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明に使用する不織布は、芯部の横断面形状は繊維軸方向において実質的に変化せず、鞘部の厚さは、繊維軸方向及び繊維周方向において不均一で且つ無作為に変化しているという特殊な複合形態を呈する芯鞘状複合長繊維を構成繊維とするものである。 In the nonwoven fabric used in the present invention, the cross-sectional shape of the core part does not substantially change in the fiber axis direction, and the thickness of the sheath part is nonuniform and randomly changes in the fiber axis direction and the fiber circumferential direction. A core-sheath composite long fiber having a special composite form is used as a constituent fiber.
芯鞘状複合長繊維は、芯部がポリエステルで鞘部がポリエチレンで構成されている。ポリエステルとポリエチレンとの相溶性乃至は親和性が適度に不良であるために、特殊な芯鞘状複合長繊維が得られる。したがって、芯部として、ポリエステル以外であってポリエチレンと相溶性乃至は親和性に優れているポリプロピレンなどを用いると、特殊な芯鞘状複合長繊維が得られにくくなる。また、ポリエステル以外であってポリエチレンと相溶性乃至は親和性が不良であるポリアミドなどを用いても、特殊な芯鞘状複合長繊維が得られにくくなる。 The core-sheath composite long fiber has a core part made of polyester and a sheath part made of polyethylene. Since the compatibility or affinity between polyester and polyethylene is moderately poor, a special core-sheath composite long fiber can be obtained. Therefore, when a polypropylene other than polyester and having excellent compatibility or affinity with polyethylene is used as the core, it becomes difficult to obtain a special core-sheath composite long fiber. Further, even if a polyamide other than polyester and having compatibility or affinity with polyethylene is used, it becomes difficult to obtain a special core-sheath composite long fiber.
芯部の横断面形状は、従来と同様に、繊維軸方向において実質的に変化しないものである。代表的には、芯部は、どの横断面をとっても、その形状が円形となっているものが好ましい。また、芯部を構成するポリエステルとしては、通常市販又は工業的に利用されているポリエチレンテレフタレートのうち、特に繊維用として市販され、利用されているものであればよい。具体的には、極限粘度が０．５０〜１．２０のポリエチレンテレフタレートを用いるのが好ましい。 The cross-sectional shape of the core portion does not substantially change in the fiber axis direction as in the conventional case. Typically, it is preferable that the core has a circular shape regardless of the cross section. Moreover, as polyester which comprises a core part, especially what is marketed and utilized especially for fibers among the polyethylene terephthalate currently marketed or industrially utilized should just be used. Specifically, it is preferable to use polyethylene terephthalate having an intrinsic viscosity of 0.50 to 1.20.
芯鞘状複合長繊維の表面、すなわち、鞘部の表面は、不規則な凹凸となっている。この不規則な凹凸は、鞘部の厚さが、繊維軸方向及び繊維周方向において不均一で且つ無作為に変化していることによって現出するものである。ここでいう鞘部の厚さについては、鞘部が存在しない箇所、すなわち、芯部が露出している箇所についても、厚さをゼロとして含めている。したがって、芯鞘状複合長繊維の繊維径は、芯部の直径をφ0とし、鞘部の厚さが最大となっている箇所の繊維径をφ1とすると、繊維軸方向において、φ0〜φ1の範囲で無作為に変化するものである。また、芯部の半径を（φ0／２）とし、鞘部の厚さが最大となっている箇所の繊維半径を（φ1／２）とすると、繊維周方向において、芯鞘状複合長繊維の繊維半径は、（φ0／２）〜（φ1／２）の範囲で無作為に変化するものである。なお、ここでは、芯部及び芯鞘状複合繊維の横断面が円形である場合について説明したが、これらの横断面は円形でなくてもよい。芯部及び芯鞘状複合長繊維の横断面が非円形の場合には、芯部の直径や芯鞘状複合長繊維の繊維径は、その横断面面積に応じた仮想円の直径や繊維径と解釈すればよい。 The surface of the core-sheath composite long fiber, that is, the surface of the sheath part has irregular irregularities. The irregular irregularities appear because the thickness of the sheath portion is nonuniformly and randomly changed in the fiber axis direction and the fiber circumferential direction. About the thickness of a sheath part here, also about the location where a sheath part does not exist, ie, the location where the core part is exposed, thickness is included as zero. Accordingly, the fiber diameter of the core sheath composite long fiber, the diameter of the core portion and phi 0, when the fiber diameter of the portion where the thickness of the sheath is the largest and phi 1, in the fiber axis direction, phi 0 it is to vary randomly in the range of to [phi] 1. Moreover, the radius of the core and (φ 0/2), when the fiber radius of the portion where the thickness of the sheath is the largest and (φ 1/2), in the fiber circumferential direction, a core sheath composite long fibers radius of the fiber is one that changes at random within the range of (φ 0/2) ~ ( φ 1/2). In addition, although the case where the cross section of the core part and the core-sheath conjugate fiber is circular has been described here, these cross sections may not be circular. When the cross section of the core and the core-sheath composite long fiber is non-circular, the diameter of the core and the fiber diameter of the core-sheath composite long fiber are the diameter of the virtual circle and the fiber diameter according to the cross-sectional area. Should be interpreted.
鞘部を構成するポリエチレンは、曳糸性の良好な第一ポリエチレンと、曳糸性の悪い第二ポリエチレンとの混合物を用いる。曳糸性の良好な第一ポリエチレンのみを使用すると、鞘部表面に不規則な凹凸が現れにくくなる。すなわち、表面に凹凸の無い典型的な芯鞘型複合繊維と同様の形態になりやすい。また、曳糸性の悪い第二ポリエチレンのみを使用すると、溶融紡糸法によって芯鞘状複合長繊維が得られにくくなる。第一ポリエチレンと第二ポリエチレンの混合比率は、第一ポリエチレン：第二ポリエチレン＝３０〜７０：７０〜３０（質量％）であるのが好ましい。第一ポリエチレンとしては、メタロセン系重合触媒により得られたポリエチレンを採用する。このポリエチレンは、低融点であって、しかも曳糸性に優れているからである。第二ポリエチレンとして、通常工業的に利用されているポリエチレン、すなわち、チグラーナッタ系重合触媒により得られたポリエチレンが用いられる。この中でも、曳糸性が悪く、低融点の低密度ポリエチレン、特に密度０．９１０〜０．９２５の低密度ポリエチレンが好ましい。 As the polyethylene constituting the sheath, a mixture of a first polyethylene having good spinnability and a second polyethylene having poor spinnability is used. If only the first polyethylene having good spinnability is used, irregular irregularities are less likely to appear on the surface of the sheath. That is, it tends to be the same form as a typical core-sheath type composite fiber having no irregularities on the surface. If only the second polyethylene having poor spinnability is used, it becomes difficult to obtain the core-sheath composite long fiber by the melt spinning method. The mixing ratio of the first polyethylene and the second polyethylene is preferably first polyethylene: second polyethylene = 30 to 70:70 to 30 (mass%). As the first polyethylene, polyethylene obtained by a metallocene polymerization catalyst is employed . This is because this polyethylene has a low melting point and excellent spinnability. As the second polyethylene, polyethylene that is usually used industrially, that is, polyethylene obtained by a Ziegler-Natta polymerization catalyst is used. Among these, low density polyethylene having poor spinnability and low melting point, particularly low density polyethylene having a density of 0.910 to 0.925 is preferable.
芯部と鞘部の質量比は、芯部１００質量部に対して、鞘部２０〜３００質量部であるのが好ましい。本発明における芯鞘状複合長繊維は、鞘部の厚さが、繊維軸方向及び繊維周方向において不均一で且つ無作為に変化しているから、この質量比は、芯鞘状複合長繊維全体における質量比を意味している。鞘部が２０質量部未満になると、熱接着成分となる鞘部の量が相対的に少なくなるため、微多孔性フィルムとの接着の際、接着強力に劣る傾向となる。鞘部が３００質量部を超えると、相対的に芯部の量が少なくなり、芯部の径が細くなり、鞘部の欠損部位、すなわち、芯部の全周が露出している部位での繊維強力が低下する。 The mass ratio of the core part to the sheath part is preferably 20 to 300 parts by mass with respect to 100 parts by mass of the core part. Core sheath composite long fibers in the present invention, the thickness of the sheath portion, since changes in and randomly uneven in the fiber axis direction and the fiber circumferential direction, the weight ratio of the core sheath composite long fibers The mass ratio in the whole is meant. When the sheath portion is less than 20 parts by mass, the amount of the sheath portion serving as a heat-bonding component is relatively reduced, and therefore the adhesive strength tends to be inferior when bonded to the microporous film. When the sheath part exceeds 300 parts by mass, the amount of the core part is relatively reduced, the diameter of the core part is reduced, and the missing part of the sheath part, that is, the part where the entire circumference of the core part is exposed. Fiber strength decreases.
本発明における芯鞘状複合長繊維の形状の具体例として、図１〜図３に芯鞘状複合長繊維の側面図（顕微鏡写真）を示す。ここで、平行な二本の直線が芯部の側面を表している。したがって、芯部は、その横断面形状が繊維軸方向において変化していないものである。そして、この平行な二本の直線の上または下にある、瘤のような盛り上がりが鞘部を表している。この図からも明らかなように、鞘部の厚さは、繊維軸方向及び繊維周方向において不均一で且つ無作為に変化している。 Specific examples of the shape of the core sheath composite long fibers in the present invention, a side view of a core-sheath-like composite long fibers in FIGS. 1 3 (micrograph) showing. Here, two parallel straight lines represent the side surface of the core. Therefore, the cross-sectional shape of the core part is not changed in the fiber axis direction. Then, a ridge-like bulge above or below the two parallel straight lines represents the sheath. As is apparent from this figure, the thickness of the sheath portion is nonuniform and randomly changed in the fiber axis direction and the fiber circumferential direction.
不織布の目付は、複合シートが用いられる用途に応じて適宜選択すればよく、通常１５〜１００ｇ／ｍ2程度であることが好ましい。 What is necessary is just to select the fabric weight of a nonwoven fabric suitably according to the use for which a composite sheet is used, and it is preferable that it is about 15-100 g / m < 2 > normally.
次に、不織布の製造方法について説明する。すなわち、ポリエステルと、メタロセン系重合触媒により得られた第一ポリエチレンとチグラーナッタ系重合触媒により得られた第二ポリエチレンとが混合されたポリエチレンとを、該ポリエステルが芯に配され、該ポリエチレンが鞘に配されるように、芯鞘型複合紡糸孔に供給し、溶融紡糸して得られた芯鞘状複合長繊維を集積することにより得ることができる。つまり、芯鞘状複合長繊維の芯部を構成する樹脂としてポリエステルを採用し、鞘部を構成する樹脂として、メタロセン系重合触媒により得られた第一ポリエチレンと、チグラーナッタ系重合触媒により得られた第二ポリエチレンとが混合されたポリエチレンを採用し、従来公知の芯鞘型複合溶融紡糸法を採用したスパンボンド法で、表面に不規則な凹凸を持つ芯鞘状複合長繊維が集積してなる長繊維不織布を得るというものである。 Next, a method for manufacturing the nonwoven fabric. That is, a polyester, a polyethylene obtained by mixing a first polyethylene obtained by a metallocene polymerization catalyst and a second polyethylene obtained by a Ziegler-Natta polymerization catalyst, the polyester is arranged in the core, and the polyethylene is in the sheath. as arranged, it can be obtained by supplying the core-sheath composite spinning holes, integrated core sheath composite long fibers obtained by melt spinning. That is, polyester was adopted as the resin constituting the core of the core-sheath composite long fiber, and the resin constituting the sheath was obtained from the first polyethylene obtained by the metallocene polymerization catalyst and the Ziegler-Natta polymerization catalyst. A core-sheath composite long fiber with irregular irregularities on the surface is accumulated by a spunbond method using a polyethylene blended with the second polyethylene and a conventionally known core-sheath type composite melt spinning method. It is to obtain a long fiber nonwoven fabric.
ポリエステル、メタロセン系重合触媒により得られた第一ポリエチレン、チグラーナッタ系重合触媒により得られた第二ポリエチレンとしては、前記したようなものが用いられる。第一ポリエチレンと第二ポリエチレンとは、前記した質量比率で均一に混合され、ポリエチレンとして扱われる。ポリエチレンのメルトフローレート（ＭＦＲ）は、１６〜２１ｇ／１０分であるのが好ましい。この範囲内であると、高速紡糸したときにも、表面が不規則な凹凸となった鞘部が形成されやすい。また、この範囲外であっても、ＭＦＲの値が大きいときには、紡糸速度を更に速くすることにより、一方ＭＦＲの値が小さいときには、紡糸速度を遅くすることにより、表面が不規則な凹凸となった鞘部を得ることができる。しかしながら、一般に採用されている紡糸速度、すなわち、３０００〜４０００ｍ／分の紡糸速度の場合には、ＭＦＲは上記した範囲内であるのが好ましい。また、ポリエチレンの融点は、低い方が好ましく、特に９０〜１１０℃程度が好ましい。微多孔性ポリエチレンフィルムと貼合する際に、比較的低温での熱処理加工が可能となるためである。 As the first polyethylene obtained by the polyester, the metallocene polymerization catalyst, and the second polyethylene obtained by the Ziegler-Natta polymerization catalyst, those described above are used. The first polyethylene and the second polyethylene are uniformly mixed at the above-described mass ratio and treated as polyethylene. The melt flow rate (MFR) of polyethylene is preferably 16 to 21 g / 10 minutes. Within this range, a sheath with irregular irregularities on the surface tends to be formed even when spinning at high speed. Even outside this range, when the MFR value is large, the spinning speed is further increased. On the other hand, when the MFR value is small, the spinning speed is decreased so that the surface becomes irregular. Can be obtained. However, in the case of a generally adopted spinning speed, that is, a spinning speed of 3000 to 4000 m / min, the MFR is preferably within the above-mentioned range. In addition, the melting point of polyethylene is preferably low, and particularly preferably about 90 to 110 ° C. This is because heat treatment can be performed at a relatively low temperature when bonding with the microporous polyethylene film.
溶融紡糸により芯鞘状複合長繊維を得た後、これを移動するコンベア上などに捕集して集積する。集積後は、エンボスロールなどに通して、部分的に熱圧接して、圧接部位で鞘部を軟化又は溶融させて、芯鞘状複合長繊維相互間を結合し、所望の引張強力を有する不織布を得る。 After obtaining a core-sheath composite long fiber by melt spinning, it is collected and collected on a moving conveyor or the like. After accumulation, the nonwoven fabric has a desired tensile strength by passing through an embossing roll, etc., partially heat-welding, softening or melting the sheath at the pressure-welding part, and bonding the core-sheath composite long fibers together. Get.
本発明に使用する微多孔性ポリエチレンフィルムは、気体，水蒸気等は通すが、水は通さない程度の小孔を多数有する微多孔構造を有し、公知のフィルムを用いることができる。例えば、無機充填剤、有機充填剤などを含有するポリエチレンフィルムより該充填剤を溶剤で溶出して製造する微多孔性フィルムや、無機充填剤、有機充填剤を含有するポリエチレン樹脂からなるシートを少なくとも１軸方向に延伸して微多孔構造を形成させて得る微多孔性フィルム等があり、本発明では、後者の延伸により製造した微多孔性フィルムを好ましく用いることができる。 The microporous polyethylene film used in the present invention has a microporous structure having a large number of small pores that allow gas, water vapor, and the like to pass but does not allow water to pass, and a known film can be used. For example, at least a microporous film produced by eluting the filler with a solvent from a polyethylene film containing an inorganic filler or an organic filler, or a sheet made of polyethylene resin containing an inorganic filler or an organic filler. There are microporous films obtained by stretching in a uniaxial direction to form a microporous structure, and in the present invention, the microporous film produced by the latter stretching can be preferably used.
ポリエチレン樹脂に含有させる充填剤の平均粒径としては、通常２０μｍ以下、好ましくは０．２〜１０μｍである。ここで、粒径が小さすぎると分散性、成形性に劣り、大きすぎると得られるフィルムの微多孔の緻密性に劣り、耐水圧が低下する傾向となる。ここで、無機充填剤の含有量は、ポリエチレン樹脂１００質量部に対して、４０〜３００質量部であることが好ましい。ここで、充填剤の含有量が４０質量部未満であると、フィルムを延伸した場合の孔の形成が十分でなく、透気性が十分に確保されない傾向となり、一方、３００質量部を超えると混練性、分散性、フィルムの製膜性が低下するとともに、強度も低下する傾向となる。 The average particle size of the filler contained in the polyethylene resin is usually 20 μm or less, preferably 0.2 to 10 μm. Here, if the particle size is too small, the dispersibility and moldability are inferior. If it is too large, the microporous density of the resulting film is inferior, and the water pressure resistance tends to decrease. Here, it is preferable that content of an inorganic filler is 40-300 mass parts with respect to 100 mass parts of polyethylene resins. Here, if the content of the filler is less than 40 parts by mass, the formation of pores when the film is stretched is not sufficient, and the air permeability tends not to be sufficiently secured. However, the strength, dispersibility and film-forming property of the film are lowered, and the strength tends to be lowered.
ポリエチレン系樹脂は、所定量の充填剤、各種添加剤とともに、混練押出成形機などを用いてペレット化し、このペレットを用いて、Ｔダイ押出成形機、インフレーション成形機を用いて製膜される。製膜されたフィルムは、少なくとも一軸方向に、１．１〜５倍程度に延伸される。延伸は多段階に行ってもよいし、二軸に延伸することもできる。この延伸によって、フィルムの強度が向上すると共に、微多孔が形成される。この延伸フィルムを熱処理することによって、フィルムの寸法安定性を向上させることができる。 The polyethylene-based resin is pelletized using a kneading extrusion molding machine or the like together with a predetermined amount of filler and various additives, and the pellet is used to form a film using a T-die extrusion molding machine or an inflation molding machine. The film thus formed is stretched by about 1.1 to 5 times in at least a uniaxial direction. Stretching may be performed in multiple stages or biaxially. This stretching improves the strength of the film and forms micropores. By heat-treating this stretched film, the dimensional stability of the film can be improved.
微多孔性ポリエチレンフィルムのフィルム厚みは、１０〜２００μｍ、好ましくは１５〜１００μｍの範囲である。このフィルムの透気度は、３０００秒／１００ｃｃ以下、好ましくは１５００秒／１００ｃｃ以下である。また、耐水圧は、５０ｋＰａ以上、好ましくは８０ｋＰａ以上である。これらの特性を満足するためには、平均径が０．１〜５０μｍの微細孔を有し、空隙率が１０〜６０％程度であることが望ましい。この微多孔性ポリエチレンフィルムのフィルム厚み、透気度、耐水圧は、本発明の複合シートの用途に応じた要求特性によって適宜決定すればよい。 The film thickness of the microporous polyethylene film is in the range of 10 to 200 μm, preferably 15 to 100 μm. The air permeability of this film is 3000 seconds / 100 cc or less, preferably 1500 seconds / 100 cc or less. The water pressure resistance is 50 kPa or more, preferably 80 kPa or more. In order to satisfy these characteristics, it is desirable to have fine pores with an average diameter of 0.1 to 50 μm and a porosity of about 10 to 60%. The film thickness, air permeability, and water pressure resistance of the microporous polyethylene film may be appropriately determined depending on the required characteristics according to the use of the composite sheet of the present invention.
微多孔性ポリエチレンフィルムを構成しているポリエチレンの融点は、芯鞘状複合長繊維の鞘部を構成しているポリエチレンの融点よりも高いことが好ましい。不織布と微多孔性ポリエチレンフィルムとを貼合する際には、不織布を構成している芯鞘状複合長繊維の鞘部を軟化または溶融させることによって行うが、芯鞘状複合長繊維の鞘部の融点とポリエチレンフィルムの融点とが同じであると、貼合の際に熱の影響を受けて、ポリエチレンフィルムが熱収縮、変形等を起こしやすく、その結果、微多孔構造を備えた状態で良好に貼合しにくい傾向となるためである。 The melting point of polyethylene constituting the microporous polyethylene film is preferably higher than the melting point of polyethylene constituting the sheath portion of the core-sheath composite long fiber. When laminating the nonwoven fabric and the microporous polyethylene film is carried out by softening or melting the sheath of the core sheath composite long fibers constituting the nonwoven fabric, a core sheath composite long If the melting point of the sheath of the fiber and the melting point of the polyethylene film are the same, the polyethylene film is susceptible to heat shrinkage during bonding, and the polyethylene film easily undergoes thermal shrinkage, deformation, etc. As a result, it has a microporous structure. This is because it tends to be difficult to bond well in a state where it is wet.
上記に説明した不織布と微多孔性ポリエチレンフィルムとを積層し、微多孔性ポリエチレンフィルムが当接している不織布面の芯鞘型複合繊維の鞘部を軟化又は溶融させ、この鞘部と微多孔性ポリエチレンフィルムとを融着させて、不織布と微多孔性ポリエチレンフィルムとを貼合すれば、複合シートを得ることができる。例えば、熱ロールや熱風等の熱処理により、不織布の鞘部を構成するポリエチレンを溶融または軟化させ、次いで、微多孔性ポリエチレンフィルムを積層し、必要に応じて、熱や圧力等をかけて両者を融着一体化させて複合シートを得る。 The nonwoven fabric described above and a microporous polyethylene film are laminated, and the sheath portion of the core-sheath type composite fiber on the nonwoven fabric surface in contact with the microporous polyethylene film is softened or melted. by fusing a polyethylene film, if laminated to the nonwoven fabric and microporous polyethylene film, it is possible to obtain a multi-focus sheet. For example, the polyethylene constituting the sheath of the nonwoven fabric is melted or softened by heat treatment such as hot rolls or hot air, and then a microporous polyethylene film is laminated, and if necessary, heat and pressure are applied to both. A composite sheet is obtained by fusing and integrating.
本発明者等は、本発明の複合シートの製造方法によれば、微多孔性ポリエチレンフィルムの微多孔構造を保持した状態で良好に貼合できる理由は以下にあると解釈している。すなわち、本発明に用いる不織布を構成している繊維が、芯鞘状複合繊維であり、接着成分として機能する鞘部が繊維軸方向および断面周方向に不規則な凹凸を有しているので、また、部分的に鞘部が存在せず芯部が露出している箇所もあるので、部分微多孔性ポリエチレンフィルムと貼り合わせの際、面的に接着するのではなく、主として鞘部の凸部とフィルムとが点で接着し、溶融または軟化した鞘部よりフィルムが受ける熱の影響が少なくなるため、微多孔構造を保持した状態で良好に貼合できる。また、得られる複合シートは、不織布と微多孔性ポリエチレンフィルムとが点接着しているため、柔軟性も良好となる。したがって、本発明の製造方法により得られる複合シートは、気体，水蒸気等は通すが、水は通さないという微多孔性ポリエチレンフィルムの性能を保持し、また、不織布により補強されているため、機械的強度に優れ、また適度な耐水圧を有している。また、不織布がヒートシール性にも優れるため、複合シートは、ヒートシール性に優れ、製袋加工等にも適している。 The present inventors interpret that the reason why the composite sheet of the present invention can be satisfactorily bonded in a state where the microporous structure of the microporous polyethylene film is maintained is as follows. That is, because the fiber constituting the nonwoven fabric used in the present invention is a core-sheath composite fiber, and the sheath functioning as an adhesive component has irregular irregularities in the fiber axis direction and the circumferential direction of the cross section, In addition, since there is a part where the sheath part does not exist partially and the core part is exposed, it is not a surface adhesive when bonded to the partially microporous polyethylene film, but mainly the convex part of the sheath part. The film and the film adhere to each other at a point, and the influence of the heat received by the film from the melted or softened sheath portion is reduced. Therefore, the film can be bonded well in a state where the microporous structure is maintained. Moreover, since the nonwoven fabric and the microporous polyethylene film are point-bonded, the obtained composite sheet has good flexibility. Therefore, the composite sheet obtained by the production method of the present invention retains the performance of a microporous polyethylene film that allows gas, water vapor and the like to pass but does not allow water to pass, and is reinforced by a nonwoven fabric, so that it is mechanical. Excellent strength and moderate water pressure resistance. Moreover, since a nonwoven fabric is excellent also in heat-sealability, a composite sheet is excellent in heat-sealability, and is suitable for bag making processing etc.
本発明の製造方法により得られる複合シートは、上記性能を有しているため、乾燥剤，脱臭剤，除湿剤等の包装材として好適に使用することができる。 Since the composite sheet obtained by the production method of the present invention has the above performance, it can be suitably used as a packaging material for desiccants, deodorants, dehumidifiers and the like.
また、本発明の製造方法により得られる複合シートは、果樹用マルチとして好適に使用することができる。すなわち、みかん等の果樹の根元に本発明の製造方法により得られる複合シートを敷設することにより、雨水の土中への浸入を防ぎ、一方、地面からの水蒸気は複合シートを通じて蒸発させることにより、地温の過度の上昇を防ぎ、果実の糖度を向上させることができる。 The composite sheet obtained by the production method of the present invention can be suitably used as a fruit tree mulch. That is, by laying the composite sheet obtained by the production method of the present invention at the base of fruit trees such as mandarin oranges, preventing rainwater from entering the soil, while water vapor from the ground is evaporated through the composite sheet, It can prevent excessive rise in soil temperature and improve the sugar content of fruits.
本発明の製造方法により得られる複合シートは、ハウスラッピング材やルーフィング材等の建築用シートとして好適に使用することができる。本発明の製造方法により得られる複合シートを建築用シートとして使用することにより、外界からの風雨の侵入を防ぎ、一方、室内や屋根裏内で発生した水蒸気を外部へ良好に逃すことができる。 The composite sheet obtained by the production method of the present invention can be suitably used as a building sheet such as a house wrapping material or a roofing material. By using the composite sheet obtained by the production method of the present invention as a building sheet, intrusion of wind and rain from the outside can be prevented, while water vapor generated in the room or attic can be released to the outside.
本発明の製造方法により得られる複合シートは、手術着の各種作業着等の衣料材として好適に使用することができる。衣料材として使用することにより、外からの血液等の液体が衣料材を通じて内側に侵入することを防ぎ、一方、透湿性，通気性には優れるため、ムレ等の不快感を防ぐことができる。 The composite sheet obtained by the production method of the present invention can be suitably used as a clothing material for various work clothes such as surgical clothes. By using it as a clothing material, it is possible to prevent liquids such as blood from the outside from entering the inside through the clothing material. On the other hand, since it is excellent in moisture permeability and air permeability, uncomfortable feeling such as swelling can be prevented.
本発明の製造方法により得られる複合シートは、不織布と微多孔性ポリエチレンフィルムとが貼合してなるものであり、不織布を構成している繊維が、芯鞘状複合長繊維であり、接着成分として機能する鞘部が繊維軸方向および断面周方向に不規則な凹凸を有しているので、微多孔構造を保持した状態で良好に貼合できる。また、得られる複合シートは柔軟性も良好である。 The composite sheet obtained by the production method of the present invention is formed by laminating a nonwoven fabric and a microporous polyethylene film, and the fibers constituting the nonwoven fabric are core-sheath composite long fibers, and an adhesive component Since the sheath part functioning as an irregular irregularities in the fiber axis direction and the circumferential direction of the cross section, it can be satisfactorily bonded while maintaining a microporous structure. Further, the obtained composite sheet has good flexibility.
以下、本発明を実施例に基づいて説明するが、本発明は実施例に限定するものではない。また、実施例における各特性値は、以下のようにして求めたものである。
（１）ポリエステルの極限粘度〔η〕：フェノールと四塩化エタンとの等質量混合溶媒１００ｃｃに試料０．５ｇを溶解し、温度２０℃の条件で測定した。
EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to an Example. The characteristic values in the examples are obtained as follows.
(1) Intrinsic viscosity [η] of polyester: 0.5 g of a sample was dissolved in 100 cc of a mixed solvent of equal mass of phenol and ethane tetrachloride and measured at a temperature of 20 ° C.
（２）融点（℃）：パーキンエルマー社製の示差走査熱量計ＤＳＣ−７型を用い、昇温速度２０℃／分で測定した。 (2) Melting point (° C.): Measured using a differential scanning calorimeter DSC-7 type manufactured by Perkin Elmer Co., Ltd. at a heating rate of 20 ° C./min.
（３）ポリエチレンのメルトフローレート（ｇ／１０分）：ＪＩＳ Ｋ ６９２２に記載の方法により、温度１９０℃、荷重２１．１８Ｎの条件で測定した。 (3) Polyethylene melt flow rate (g / 10 min): Measured by the method described in JIS K 6922 under conditions of a temperature of 190 ° C. and a load of 21.18 N.
（４）引張強力（Ｎ／５ｃｍ幅）：合繊長繊維不織布試験法（ＪＩＳ Ｌ １９０６）に準じて、東洋ボールドウイン社製テンシロンＲＴＭ−５００型を用いて、幅５０ｍｍ、長さ２００ｍｍの試験片を、把持間隔１００ｍｍ、引張速度１００ｍｍ／分の条件で測定し、試験片１０点の平均値を求め、引張強力とした。なお、引張強力については、不織布のＭＤ方向（機械方向）及びＣＤ方向（ＭＤ方向に直交する方向）の両方を求めた。 (4) Tensile strength (N / 5 cm width): A test piece having a width of 50 mm and a length of 200 mm using a Tensilon RTM-500 model manufactured by Toyo Baldwin Co., Ltd. according to the synthetic fiber long-fiber nonwoven fabric test method (JIS L 1906). Was measured under the conditions of a gripping interval of 100 mm and a tensile speed of 100 mm / min, and an average value of 10 test pieces was obtained to obtain a tensile strength. In addition, about tensile strength, both MD direction (machine direction) and CD direction (direction orthogonal to MD direction) of the nonwoven fabric were calculated | required.
（５）透気度：ＪＩＳ Ｐ ８１１７に準じて測定した。 (5) Air permeability: Measured according to JIS P 8117.
（６）耐水圧：ＪＩＳ Ｌ １０９２ 低水圧法に準じて測定した。 (6) Water pressure resistance: Measured according to JIS L 1092 low water pressure method.
実施例１
極限粘度〔η〕０．７０、融点２６０℃のポリエチレンテレフタレートを準備した。一方、メルトフローレート１８ｇ／１０分、密度０．９１３ｇ／ｃｃ、融点１０４℃のポリエチレンを準備した。このポリエチレンは、メタロセン系重合触媒により得られた、メルトフローレート２８ｇ／１０分、密度０．９０６ｇ／ｃｃ、融点９７℃の第一ポリエチレン４０重量部と、チグラーナッタ系重合触媒により得られた、メルトフローレート１４ｇ／１０分、密度０．９１８ｇ／ｃｃ、融点１０６℃の第二ポリエチレン６０重量部との混合物である。
Example 1
A polyethylene terephthalate having an intrinsic viscosity [η] of 0.70 and a melting point of 260 ° C. was prepared. Meanwhile, polyethylene having a melt flow rate of 18 g / 10 min, a density of 0.913 g / cc, and a melting point of 104 ° C. was prepared. This polyethylene was obtained by using a metallocene polymerization catalyst, a melt flow rate of 28 g / 10 min, a density of 0.906 g / cc, 40 parts by weight of first polyethylene having a melting point of 97 ° C., and a Ziegler-Natta polymerization catalyst. A mixture of 60 parts by weight of second polyethylene having a flow rate of 14 g / 10 min, a density of 0.918 g / cc, and a melting point of 106 ° C.
そして、ポリエステルが芯に配され、ポリエチレンが鞘に配されるように、且つ、両者が等重量部となるようにして、芯鞘型複合紡糸孔に供給し、紡糸温度２８０℃、紡糸速度３８００ｍ／分で溶融紡糸を行った。溶融紡糸した後、吸引装置により引き取り細化し、吸引装置から排出された糸条群を開繊した後、移動する捕集面上に芯鞘状複合長繊維（繊度３．３ｄＴｅｘ）を集積させて不織ウェブを得た。この不織ウェブを、表面温度９５℃のエンボスロール（凸部の面積率３６％）と、表面温度９５℃のフラットロールからなる熱エンボス装置に導き、線圧２９４Ｎ／ｃｍの条件で、部分的に熱圧接処理を施して、目付５０ｇ／ｍ2の長繊維不織布を得た。 Then, the polyester is arranged on the core, the polyethylene is arranged on the sheath, and both are made to be equal parts by weight, and supplied to the core-sheath type composite spinning hole, the spinning temperature is 280 ° C., the spinning speed is 3800 m. Melt spinning was performed at a rate of 1 minute. After melt spinning, it is taken up and refined by a suction device, and after opening the yarn group discharged from the suction device, core-sheath composite long fibers (fineness 3.3 dTex) are accumulated on the moving collecting surface. A nonwoven web was obtained. This nonwoven web was led to a heat embossing device comprising an embossing roll having a surface temperature of 95 ° C. (projection area ratio of 36%) and a flat roll having a surface temperature of 95 ° C., and partially subjected to a linear pressure of 294 N / cm. Was subjected to a heat-pressure welding treatment to obtain a nonwoven fabric of long fibers having a basis weight of 50 g / m 2 .
得られた長繊維不織布の片面を８０℃に加熱されたロールに接触させた後、線状低密度ポリエチレンからなる微多孔性フィルム（透気度３５０秒／１００ｃｃ）と長繊維不織布とを、長繊維不織布の加熱ロールに接触させた面がフィルム側となるように重ね合わせ、１００℃に加熱された一対のロール間に通して、加圧することにより、両者を貼り合わせて、本発明の複合シートを得た。得られた複合シートの引張強力は、ＭＤ方向１９０Ｎ／５ｃｍ幅、ＣＤ方向１１０Ｎ／５ｃｍ幅、透気度は６１０秒／１００ｃｃ、耐水圧は１５０ｋＰａであった。また、手で触った際には、柔らかい感触を有するものであった。 After making one side of the obtained long fiber nonwoven fabric contact with a roll heated to 80 ° C., a microporous film (air permeability 350 seconds / 100 cc) made of linear low density polyethylene and the long fiber nonwoven fabric are long The composite sheet of the present invention is laminated so that the surface of the fiber nonwoven fabric brought into contact with the heated roll is on the film side, and is passed through a pair of rolls heated to 100 ° C. and pressed to bond them together. Got. The tensile strength of the obtained composite sheet was 190 N / 5 cm width in the MD direction, 110 N / 5 cm width in the CD direction, the air permeability was 610 seconds / 100 cc, and the water pressure resistance was 150 kPa. Moreover, when touched with a hand, it had a soft touch.
実施例２
極限粘度〔η〕０．７０、融点２６０℃のポリエチレンテレフタレートを準備した。一方、メルトフローレート１８ｇ／１０分、密度０．９１０ｇ／ｃｃ、融点１０３℃のポリエチレンを準備した。このポリエチレンは、メタロセン系重合触媒により得られた、メルトフローレート２８ｇ／１０分、密度０．９０６ｇ／ｃｃ、融点９７℃の第一ポリエチレン６７重量部と、チグラーナッタ系重合触媒により得られた、メルトフローレート８ｇ／１０分、密度０．９１９ｇ／ｃｃ、融点１０７℃の第二ポリエチレン３３重量部との混合物である。
Example 2
A polyethylene terephthalate having an intrinsic viscosity [η] of 0.70 and a melting point of 260 ° C. was prepared. Meanwhile, polyethylene having a melt flow rate of 18 g / 10 min, a density of 0.910 g / cc, and a melting point of 103 ° C. was prepared. This polyethylene was obtained by using a metallocene polymerization catalyst, melt flow rate 28 g / 10 min, density 0.906 g / cc, melting point 97 ° C. first polyethylene 67 parts by weight, and Ziegler-Natta polymerization catalyst. It is a mixture of 33 parts by weight of second polyethylene having a flow rate of 8 g / 10 min, a density of 0.919 g / cc, and a melting point of 107 ° C.
このポリエステルとポリエチレンとを用い、実施例１と同様の方法で目付５０ｇ／ｍ2の長繊維不織布を得た。 Using this polyester and polyethylene, a long fiber nonwoven fabric having a basis weight of 50 g / m 2 was obtained in the same manner as in Example 1.
得られた長繊維不織布を用い、実施例１と同様の方法で、微多孔性フィルムと貼り合せて本発明の複合シートを得た。得られた複合シートの引張強力は、ＭＤ方向２０５Ｎ／５ｃｍ幅、ＣＤ方向１０５Ｎ／５ｃｍ幅、透気度は５７０秒／１００ｃｃ、耐水圧は１４５ｋＰａであった。また、手で触った際には、柔らかい感触を有するものであった。 Using the obtained non-woven fabric, the composite sheet of the present invention was obtained by laminating with a microporous film in the same manner as in Example 1. The tensile strength of the obtained composite sheet was 205 N / 5 cm width in the MD direction, 105 N / 5 cm width in the CD direction, the air permeability was 570 seconds / 100 cc, and the water pressure resistance was 145 kPa. Moreover, when touched with a hand, it had a soft touch.
Claims (7)
芯部が該ポリエステルで鞘部が該ポリエチレンで構成され、芯部の横断面形状は繊維軸方向において実質的に変化せず、鞘部の厚さは、繊維軸方向及び繊維周方向において不均一で且つ無作為に変化している芯鞘状複合長繊維を得た後、該芯鞘状複合長繊維を集積して不織布を得、
該不織布と微多孔性ポリエチレンフィルムとを積層し、微多孔性ポリエチレンフィルムが当接している不織布面の芯鞘状複合長繊維の鞘部を軟化または溶融させることによって、該不織布と微多孔性ポリエチレンフィルムとを貼合することを特徴とする複合シートの製造方法。 A polyester, a polyethylene obtained by mixing a first polyethylene obtained by a metallocene polymerization catalyst and a second polyethylene obtained by a Ziegler-Natta polymerization catalyst, the polyester is arranged in the core, and the polyethylene is arranged in the sheath. To be supplied to the core-sheath type composite spinning hole, melt-spun,
The core is composed of the polyester and the sheath is composed of the polyethylene. The cross-sectional shape of the core is not substantially changed in the fiber axis direction, and the thickness of the sheath is not uniform in the fiber axis direction and the fiber circumferential direction. And after obtaining a core-sheath-like composite long fiber that is randomly changing, the core-sheath- like composite long fiber is accumulated to obtain a nonwoven fabric,
Laminating a nonwoven fabric and a microporous polyethylene film, by softening or melting the sheath of the core sheath composite long fibers of the nonwoven fabric surface microporous polyethylene film is in contact with, the nonwoven fabric and the microporous polyethylene The manufacturing method of the composite sheet characterized by bonding a film .
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