TWI771425B - Laminated non-woven fabric - Google Patents

Laminated non-woven fabric Download PDF

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Publication number
TWI771425B
TWI771425B TW107118505A TW107118505A TWI771425B TW I771425 B TWI771425 B TW I771425B TW 107118505 A TW107118505 A TW 107118505A TW 107118505 A TW107118505 A TW 107118505A TW I771425 B TWI771425 B TW I771425B
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Taiwan
Prior art keywords
woven fabric
core
nonwoven fabric
sheath
fibers
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TW107118505A
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Chinese (zh)
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TW201904536A (en
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工藤洋介
地蔵堂真一
小田勝二
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日商東洋紡股份有限公司
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    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D04H1/5412Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres sheath-core
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01FCHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/06Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282Addition polymers
    • D04H1/4291Olefin series
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D04H1/5418Mixed fibres, e.g. at least two chemically different fibres or fibre blends

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nonwoven Fabrics (AREA)
  • Multicomponent Fibers (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

本發明之不織布係包含同芯芯鞘型複合纖維之短纖維不織布,前述同芯芯鞘型複合纖維之鞘成分含有直鏈狀低密度聚乙烯,芯成分含有具有較前述直鏈狀低密度聚乙烯高20℃以上之融點的熱塑性樹脂。本發明之積層不織布具有前述不織布作為第一不織布層,進而具有由短纖維不織布所構成之第二不織布層。 The non-woven fabric of the present invention is a staple fiber non-woven fabric comprising a core-sheath type composite fiber. A thermoplastic resin with a melting point higher than 20°C of ethylene. The laminated non-woven fabric of the present invention has the aforementioned non-woven fabric as a first non-woven fabric layer, and further has a second non-woven fabric layer composed of a short-fiber non-woven fabric.

Description

積層不織布 Laminated non-woven fabric

本發明係關於一種不織布,詳細而言,本發明係關於一種包含同芯芯鞘型複合纖維之短纖維不織布、及包含該短纖維不織布之積層不織布。 The present invention relates to a nonwoven fabric, and more specifically, the present invention relates to a short fiber nonwoven fabric comprising a core-sheath type composite fiber, and a laminated nonwoven fabric comprising the short fiber nonwoven fabric.

先前,已知各種不織布。例如於專利文獻1中揭示有一種將不織網A與不織網B積層並進行熱壓接而成之不織布,其中上述不織網A係由芯成分聚合物之融點高於鞘成分聚合物之融點的芯鞘構造之合成長纖維所構成,上述不織網B係由芯成分聚合物之融點高於鞘成分聚合物之融點且鞘成分聚合物之融點低於前述長纖維之鞘成分聚合物之融點的芯鞘構造之合成長纖維所構成。於專利文獻2中揭示有一種使用熱接著性複合纖維之不織布,上述熱接著性複合纖維係同芯芯鞘型之熱接著性複合纖維,鞘成分為聚烯烴,且芯成分為具有較前述聚烯烴之融點高20℃以上之融點的聚酯,且上述熱接著性複合纖維係賦予有捲縮數(個/25mm)為12至19,捲縮率(%)為10至20且捲縮率/捲縮數為0.8至1.1之捲縮而成。於專利文獻3中揭示有以下不織布,該不織布具有第一層及第二層,第二層之密度 低於第一層之密度,且該不織布係藉由透氣(air through)法而製造,並且,至少第一層所含之纖維之橫剖面成為扁平,該纖維之橫剖面之長軸方向係大致於前述不織布之平面方向配向,第一層側之表面之表面粗糙度之平均偏差SMD為2.5μm以下且摩擦係數之平均偏差MMD小於0.008,前述不織布之壓縮特性之線形性LC為0.3以下且彎曲剛性B為0.03cN.cm2/cm以下。 Previously, various nonwoven fabrics have been known. For example, Patent Document 1 discloses a non-woven fabric obtained by laminating a non-woven web A and a non-woven web B and thermally press-bonding the non-woven web A, wherein the non-woven web A is made of a polymer whose melting point of the core component is higher than that of the sheath component. The nonwoven web B is composed of synthetic long fibers with a core-sheath structure having a melting point of the material. The sheath component of the fiber is composed of synthetic long fibers of a core-sheath structure of the melting point of the polymer. Patent Document 2 discloses a nonwoven fabric using a heat-adhesive conjugate fiber. The heat-adhesive conjugate fiber is a core-sheath-type heat-adhesive conjugate fiber, the sheath component is polyolefin, and the core component is a polyolefin having a higher thickness than the above-mentioned polyolefin. Polyester whose melting point of olefin is higher than the melting point of 20°C or more, and the above-mentioned heat-adhesive conjugate fiber is provided with a crimp number (pieces/25mm) of 12 to 19, a crimp ratio (%) of 10 to 20, and a crimp rate (%) of 10 to 20. The shrinkage/crimp number is 0.8 to 1.1 crimp. Patent Document 3 discloses a nonwoven fabric having a first layer and a second layer, the density of the second layer is lower than the density of the first layer, and the nonwoven fabric is produced by an air through method, and , at least the cross-section of the fibers contained in the first layer becomes flat, the long-axis direction of the cross-section of the fibers is approximately aligned with the plane direction of the aforementioned non-woven fabric, and the average deviation SMD of the surface roughness of the surface of the first layer side is 2.5 μm or less and the average deviation MMD of the friction coefficient is less than 0.008, the linearity LC of the compression characteristics of the aforementioned non-woven fabric is 0.3 or less and the bending rigidity B is 0.03cN. cm 2 /cm or less.

[先前技術文獻] [Prior Art Literature] [專利文獻] [Patent Literature]

專利文獻1:日本特開平4-316654公報。 Patent Document 1: Japanese Patent Laid-Open No. 4-316654.

專利文獻2:日本特開2003-41439號公報。 Patent Document 2: Japanese Patent Laid-Open No. 2003-41439.

專利文獻3:日本特開2006-233364號公報。 Patent Document 3: Japanese Patent Laid-Open No. 2006-233364.

如上所述,先前已知各種不織布,該不織布之用途亦遍及多方面。例如,包含由熱塑性樹脂所構成之合成纖維的不織布可用於拋棄式尿片或經期衛生棉等吸收性物品用之片材。於將不織布用於此種用途之情形時,不織布係以直接觸碰肌膚之方式使用,故而期望具有良好之觸感。 As mentioned above, various nonwoven fabrics have been previously known, and the uses of the nonwoven fabrics are also widespread. For example, non-woven fabrics containing synthetic fibers composed of thermoplastic resins can be used as sheets for absorbent articles such as disposable diapers and sanitary napkins. When the non-woven fabric is used for such a purpose, the non-woven fabric is used so as to directly touch the skin, so it is expected to have a good touch.

本發明係鑒於前述情況而成,本發明之目的在於提供一種具有柔軟之觸感且肌膚觸碰感優異之不織布。 The present invention is made in view of the above-mentioned circumstances, and an object of the present invention is to provide a nonwoven fabric which has a soft touch and is excellent in touch with the skin.

本發明包含以下發明。 The present invention includes the following inventions.

[1]一種不織布,係包含同芯芯鞘型複合纖維之短纖維不織布,前述同芯芯鞘型複合纖維之鞘成分含有直鏈狀低密度聚乙烯,芯成分含有具有較前述直鏈狀低密度聚乙烯高20℃以上之融點的熱塑性樹脂。 [1] A nonwoven fabric comprising a short fiber nonwoven fabric of a core-sheath-type composite fiber, wherein the sheath component of the core-core-sheath-type composite fiber contains linear low-density polyethylene, and the core component contains a linear low-density polyethylene. Density polyethylene is a thermoplastic resin with a melting point higher than 20°C.

[2]如[1]所記載之不織布,其中前述同芯芯鞘型複合纖維之捲縮數為10個/25mm至30個/25mm,捲縮率為10%至30%。 [2] The nonwoven fabric according to [1], wherein the number of crimps of the aforementioned co-core-sheath type conjugate fibers is 10 pieces/25mm to 30 pieces/25mm, and the crimp rate is 10% to 30%.

[3]一種積層不織布,係具有如[1]或[2]所記載之不織布作為第一不織布層,進而具有由短纖維不織布所構成之第二不織布層。 [3] A laminated nonwoven fabric having the nonwoven fabric as described in [1] or [2] as a first nonwoven fabric layer, and further having a second nonwoven fabric layer composed of a short fiber nonwoven fabric.

[4]如[3]所記載之積層不織布,其中前述第一不織布層之表觀密度大於前述第二不織布層之表觀密度。 [4] The laminated nonwoven fabric according to [3], wherein the apparent density of the first nonwoven fabric layer is greater than the apparent density of the second nonwoven fabric layer.

[5]如[3]或[4]所記載之積層不織布,其中前述第一不織布層及前述第二不織布層之基重分別為10g/m2至60g/m2[5] The laminated nonwoven fabric according to [3] or [4], wherein the basis weights of the first nonwoven fabric layer and the second nonwoven fabric layer are respectively 10 g/m 2 to 60 g/m 2 .

本發明之不織布由於鞘成分係由含有直鏈狀低密度聚乙烯之同芯芯鞘型複合纖維所構成,故而具有柔軟之觸感,且肌膚觸碰感優異。 Since the sheath component of the nonwoven fabric of the present invention is composed of a core-sheath-type composite fiber containing a linear low-density polyethylene, it has a soft touch and is excellent in touch with the skin.

本發明之不織布係包含同芯芯鞘型複合纖維之短纖維不織布,並且,同芯芯鞘型複合纖維之鞘成分含有直鏈狀低密度聚乙烯,芯成分含有具有較前述直鏈狀低密度聚乙烯之融點高20℃以上之融點的熱塑性樹脂。本發明之不織布由於鞘成分係由含有直鏈狀低密度聚乙烯之同芯芯鞘型複合纖維所構成,故而具有柔軟之觸感,且肌膚觸碰感優異。因此,本發明之不織布可合適地用作拋棄式尿片、生理用品等吸收性物品之貼膚側之構件、手術簾或紗布等醫療用不織布製品、濕紙巾或濕毛巾等。以下,對本發明之不織布加以詳細說明。 The non-woven fabric of the present invention is a short-fiber non-woven fabric comprising a core-sheath-type composite fiber, and the sheath component of the core-core-sheath-type composite fiber contains a linear low-density polyethylene, and the core component contains a linear low-density polyethylene. The melting point of polyethylene is a thermoplastic resin whose melting point is 20°C or higher. Since the sheath component of the nonwoven fabric of the present invention is composed of a core-sheath-type composite fiber containing a linear low-density polyethylene, it has a soft touch and is excellent in touch with the skin. Therefore, the non-woven fabric of the present invention can be suitably used as a skin-facing member of absorbent articles such as disposable diapers and sanitary products, medical non-woven fabric products such as surgical drapes and gauze, wet tissues or wet towels, and the like. Hereinafter, the nonwoven fabric of the present invention will be described in detail.

構成芯鞘型複合纖維之鞘成分的直鏈狀低密度聚乙烯係以對纖維表面賦予柔軟之觸感,於製成不織布時提供良好之肌膚觸碰感的方式發揮作用。構成芯鞘型複合纖維之鞘成分的直鏈狀低密度聚乙烯只要為含有伸乙基(-CH2-CH2-)作為重複單元之直鏈狀之(共)聚合物,則並無特別限定,就容易提高纖維之柔軟性之方面而言,較佳為乙烯與碳數3以上之α-烯烴之共聚合物。作為碳數3以上之α-烯烴,可列舉:丙烯、丁烯-1、戊烯-1、4-甲基戊烯-1、己烯-1、4-甲基己烯-1、庚烯-1、辛烯-1、壬烯-1、癸烯-1、十二烯-1等。這些α-烯烴可僅包含一種,亦可包含 兩種以上。作為α-烯烴之碳數,較佳為4以上,另外,較佳為12以下,更佳為8以下,又更佳為6以下。其中,作為α-烯烴,較佳為丙烯、丁烯-1、4-甲基戊烯-1、己烯-1、4-甲基己烯-1、辛烯-1,更佳為丁烯-1、己烯-1。 The linear low-density polyethylene constituting the sheath component of the core-sheath composite fiber acts to impart a soft touch to the surface of the fiber and to provide a good touch to the skin when it is made into a nonwoven fabric. The linear low-density polyethylene constituting the sheath component of the core-sheath composite fiber is not particularly limited as long as it is a linear (co)polymer containing an ethylene group (-CH 2 -CH 2 -) as a repeating unit. However, from the viewpoint of easily improving the flexibility of the fiber, a copolymer of ethylene and an α-olefin having 3 or more carbon atoms is preferable. Examples of α-olefins having 3 or more carbon atoms include propylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, 4-methylhexene-1, and heptene. -1, octene-1, nonene-1, decene-1, dodecene-1, etc. Only one kind of these α-olefins may be included, or two or more kinds thereof may be included. As carbon number of an alpha-olefin, 4 or more are preferable, and 12 or less are preferable, 8 or less are more preferable, and 6 or less are still more preferable. Among them, as the α-olefin, propylene, butene-1, 4-methylpentene-1, hexene-1, 4-methylhexene-1, and octene-1 are preferred, and butene is more preferred -1. Hexene-1.

直鏈狀低密度聚乙烯中之α-烯烴之含量較佳為1mol%以上,更佳為2mol%以上,另外,較佳為10mol%以下,更佳為5mol%以下。藉由將直鏈狀低密度聚乙烯中之α-烯烴之含量設為1mol%以上,容易提高纖維之柔軟性。另一方面,若α-烯烴之含量變多,則結晶性變差,於纖維化時纖維彼此容易融著,故而直鏈狀低密度聚乙烯中之α-烯烴之含量較佳為10mol%以下。 The content of the α-olefin in the linear low density polyethylene is preferably 1 mol% or more, more preferably 2 mol% or more, and is preferably 10 mol% or less, more preferably 5 mol% or less. By setting the content of α-olefin in the linear low-density polyethylene to 1 mol % or more, it is easy to improve the flexibility of the fiber. On the other hand, when the content of α-olefin increases, the crystallinity deteriorates, and fibers are easily fused to each other during fiberization. Therefore, the content of α-olefin in the linear low-density polyethylene is preferably 10 mol % or less. .

直鏈狀低密度聚乙烯之密度(真密度)較佳為0.900g/cm3以上,更佳為0.905g/cm3以上,又更佳為0.910g/cm3以上,進而更佳為0.913g/cm3以上,另外,較佳為0.945g/cm3以下,更佳為0.940g/cm3以下,又更佳為0.938g/cm3以下。若直鏈狀低密度聚乙烯之密度為0.900g/cm3以上,則於製成不織布時容易賦予蓬鬆性或體積恢復性。另外,於製造不織布時,高速梳棉性優異。若直鏈狀低密度聚乙烯之密度為0.945g/cm3以下,則容易提升製成不織布時之表面觸感,另外容易確保不織布之厚度方向之柔軟性。 The density (true density) of the linear low-density polyethylene is preferably 0.900 g/cm 3 or more, more preferably 0.905 g/cm 3 or more, still more preferably 0.910 g/cm 3 or more, and still more preferably 0.913 g /cm 3 or more, and preferably 0.945 g/cm 3 or less, more preferably 0.940 g/cm 3 or less, and still more preferably 0.938 g/cm 3 or less. When the density of the linear low-density polyethylene is 0.900 g/cm 3 or more, bulkiness or volume recovery can be easily imparted when it is made into a nonwoven fabric. In addition, when producing nonwoven fabrics, high-speed carding properties are excellent. If the density of the linear low-density polyethylene is 0.945 g/cm 3 or less, it is easy to improve the surface feel when it is made into a non-woven fabric, and it is easy to ensure the flexibility in the thickness direction of the non-woven fabric.

直鏈狀低密度聚乙烯之融點較佳為110℃以上128℃以下。若直鏈狀低密度聚乙烯之融點為110℃以上,則即便藉由高溫之熱接著而製造不織布時,亦容易使不織布之表面觸感良好。另外,於製造不織布時,高速梳棉性優異,所得之不織布容易具有良好之均一性(或良好之質地)。若直鏈狀低密度聚乙烯之融點為128℃以下,則即便於藉由低溫之熱接著而製造不織布時,亦容易獲得具有可耐實用之程度之強度的不織布。 The melting point of the linear low-density polyethylene is preferably 110°C or higher and 128°C or lower. When the melting point of the linear low-density polyethylene is 110° C. or higher, even when a non-woven fabric is produced by high-temperature thermal bonding, the surface of the non-woven fabric can easily be made to have a good touch. In addition, when producing non-woven fabrics, high-speed carding properties are excellent, and the obtained non-woven fabrics tend to have good uniformity (or good texture). If the melting point of the linear low-density polyethylene is 128° C. or lower, even when a nonwoven fabric is produced by thermal bonding at a low temperature, a nonwoven fabric having a strength that is durable enough for practical use can be easily obtained.

直鏈狀低密度聚乙烯之MFR(Melt Flow Rate;熔體質量流率)較佳為1g/10min以上,更佳為2g/10min以上,又更佳為3g/10min以上,進而更佳為5g/10min以上,另外,較佳為60g/10min以下,更佳為40g/10min以下,又更佳為35g/10min以下,進而更佳為30g/10min以下。若直鏈狀低密度聚乙烯之MFR為1g/10min以上,則紡絲性變得良好,若直鏈狀低密度聚乙烯之MFR為60g/10min以下,則於製造纖維時不易引起纖維彼此之融著,容易形成單纖維。MFR係依據JIS(Japanese Industrial Standards;日本工業標準)K 6922-1(1997)(條件:190℃,荷重21.18N(2.16kgf))而測定。 The MFR (Melt Flow Rate; melt mass flow rate) of the linear low-density polyethylene is preferably 1g/10min or more, more preferably 2g/10min or more, still more preferably 3g/10min or more, and still more preferably 5g /10min or more, and preferably 60g/10min or less, more preferably 40g/10min or less, still more preferably 35g/10min or less, still more preferably 30g/10min or less. When the MFR of the linear low-density polyethylene is 1 g/10min or more, the spinnability becomes good, and when the MFR of the linear low-density polyethylene is 60 g/10min or less, the fibers are less likely to interact with each other during fiber production. When melted, it is easy to form single fibers. MFR is measured according to JIS (Japanese Industrial Standards; Japanese Industrial Standards) K 6922-1 (1997) (conditions: 190°C, load 21.18N (2.16kgf)).

直鏈狀低密度聚乙烯之重量平均分子量(Mw)相對於數量平均分子量(Mn)之比Mw/Mn較佳為5.0以下,更佳為4.0以下,又更佳為3.5以下。直鏈狀低密度聚乙烯之 Mw/Mn之下限值並無特別限定,通常為1.5以上,亦可為2.0以上,亦可為2.5以上。 The ratio Mw/Mn of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the linear low density polyethylene is preferably 5.0 or less, more preferably 4.0 or less, and still more preferably 3.5 or less. Linear Low Density Polyethylene The lower limit value of Mw/Mn is not particularly limited, but is usually 1.5 or more, may be 2.0 or more, or may be 2.5 or more.

關於直鏈狀低密度聚乙烯之彎曲彈性模量,就提升所得之不織布之表面觸感,確保蓬鬆性之方面而言,較佳為65MPa以上,更佳為120MPa以上,又更佳為180MPa以上,進而更佳為250MPa以上,另外,較佳為850MPa以下,更佳為750MPa以下,又更佳為700MPa以下,進而更佳為650MPa以下。彎曲彈性模量係依據JIS K 7171(2008)而測定。若直鏈狀低密度聚乙烯之彎曲彈性模量為65MPa以上,則容易對所得之不織布賦予蓬鬆性或彈力性。另一方面,若直鏈狀低密度聚乙烯之彎曲彈性模量為850MPa以下,則容易使所得之不織布之表面觸感柔軟。 The flexural modulus of elasticity of the linear low-density polyethylene is preferably 65 MPa or more, more preferably 120 MPa or more, and more preferably 180 MPa or more in terms of improving the surface feel of the obtained nonwoven fabric and ensuring bulkiness , more preferably 250 MPa or more, and more preferably 850 MPa or less, more preferably 750 MPa or less, still more preferably 700 MPa or less, and still more preferably 650 MPa or less. The flexural modulus was measured according to JIS K 7171 (2008). When the flexural elastic modulus of the linear low-density polyethylene is 65 MPa or more, bulkiness or elasticity can be easily imparted to the obtained nonwoven fabric. On the other hand, when the flexural modulus of the linear low-density polyethylene is 850 MPa or less, it is easy to make the surface of the obtained nonwoven fabric soft to the touch.

直鏈狀低密度聚乙烯之計示硬度(HDD)較佳為45以上,更佳為48以上,又更佳為50以上,另外,較佳為75以下,更佳為70以下,又更佳為65以下,進而更佳為62以下。計示硬度(HDD)係使用D型硬度計而測定,且係依據JIS K 7215(1986)而測定。若直鏈狀低密度聚乙烯之計示硬度(HDD)為45以上,則容易對所得之不織布賦予蓬鬆性,或使所得之不織布具有體積恢復性。另外,容易確保製造纖維時之梳棉通過。若直鏈狀低密度聚乙烯之計示硬度(HDD)為75以下,則容易使所得之不織布之表面觸感柔軟。 The hardness on display (HDD) of the linear low-density polyethylene is preferably 45 or more, more preferably 48 or more, still more preferably 50 or more, and more preferably 75 or less, more preferably 70 or less, still more preferably It is 65 or less, and more preferably, it is 62 or less. The durometer hardness (HDD) was measured using a D-type durometer, and was measured in accordance with JIS K 7215 (1986). When the hardness (HDD) of linear low-density polyethylene is 45 or more, it is easy to impart bulkiness to the obtained nonwoven fabric or to impart volume recovery properties to the obtained nonwoven fabric. In addition, it is easy to ensure the passage of the card during fiber production. If the hardness (HDD) of linear low-density polyethylene is 75 or less, the surface of the obtained nonwoven fabric can be easily made soft to the touch.

直鏈狀低密度聚乙烯例如可藉由使用茂金屬觸媒或齊格勒-納塔觸媒使包含乙烯之單體成分進行(共)聚合而容易地獲得。直鏈狀低密度聚乙烯較佳為藉由使乙烯與α-烯烴進行共聚合而製造。 Linear low-density polyethylene can be easily obtained, for example, by (co)polymerizing a monomer component containing ethylene using a metallocene catalyst or a Ziegler-Natta catalyst. The linear low-density polyethylene is preferably produced by copolymerizing ethylene and an α-olefin.

芯鞘型複合纖維之鞘成分亦可包含直鏈狀低密度聚乙烯以外之聚合物成分。再者,鞘成分較佳為含有直鏈狀低密度聚乙烯作為主成分,具體而言,於鞘成分100質量%中,直鏈狀低密度聚乙烯之含有比率較佳為50質量%以上,更佳為60質量%以上,又更佳為75質量%以上。鞘成分亦可僅包含直鏈狀低密度聚乙烯作為聚合物成分。 The sheath component of the core-sheath composite fiber may contain a polymer component other than linear low-density polyethylene. Furthermore, the sheath component preferably contains linear low-density polyethylene as a main component, and specifically, the content ratio of linear low-density polyethylene in 100 mass % of the sheath component is preferably 50 mass % or more, More preferably, it is 60 mass % or more, and still more preferably 75 mass % or more. The sheath component may contain only linear low-density polyethylene as a polymer component.

作為鞘成分所含之直鏈狀低密度聚乙烯以外之聚合物成分,例如可列舉:高密度聚乙烯、分支狀低密度聚乙烯、聚丙烯、聚丁烯(polybutene)、聚丁烯(polybutylene)、聚甲基戊烯、聚丁二烯及這些之共聚合物等聚烯烴系樹脂;聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚對苯二甲酸三亞甲酯、聚萘二甲酸乙二酯、聚乳酸、聚琥珀酸丁二酯及這些之共聚合物等聚酯樹脂;尼龍66、尼龍12、尼龍6等聚醯胺系樹脂;聚(甲基)丙烯酸甲酯、聚(甲基)丙烯酸乙酯、乙烯-(甲基)丙烯酸甲酯共聚合物、乙烯-(甲基)丙烯酸共聚合物等丙烯酸系樹脂;聚乙酸乙烯酯、乙烯-乙酸乙烯酯共聚合物等乙烯酯系樹脂;聚乙烯醇、乙烯-乙烯醇共聚 合物等乙烯醇系樹脂;聚碳酸酯;聚縮醛;聚苯乙烯;環烯烴系樹脂等。這些樹脂可僅含有一種,亦可含有兩種以上。其中,較佳為於鞘成分中進而含有分支狀低密度聚乙烯,藉此可提高不織布之厚度方向之柔軟性。另外,藉由使鞘成分中含有分支狀低密度聚乙烯,可於較廣之溫度範圍內加工不織布,例如於藉由熱接著而形成不織布之情形等時,容易獲得具有均一之柔軟性之不織布。 Examples of polymer components other than linear low-density polyethylene contained in the sheath component include high-density polyethylene, branched low-density polyethylene, polypropylene, polybutene, and polybutylene. ), polymethylpentene, polybutadiene and their copolymers and other polyolefin resins; polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate , Polyester resins such as polyethylene naphthalate, polylactic acid, polybutylene succinate and their copolymers; polyamide resins such as nylon 66, nylon 12, nylon 6; poly(meth)acrylic acid Acrylic resins such as methyl ester, polyethyl(meth)acrylate, ethylene-(meth)acrylate copolymer, ethylene-(meth)acrylic acid copolymer; polyvinyl acetate, ethylene-vinyl acetate Vinyl ester resins such as copolymers; polyvinyl alcohol, ethylene-vinyl alcohol copolymerization Compounds and other vinyl alcohol resins; polycarbonate; polyacetal; polystyrene; cycloolefin resins, etc. Only one of these resins may be contained, or two or more of them may be contained. Among them, it is preferable to further contain branched low-density polyethylene in the sheath component, whereby the flexibility in the thickness direction of the nonwoven fabric can be improved. In addition, by including branched low-density polyethylene in the sheath component, the nonwoven fabric can be processed in a wide temperature range. For example, when the nonwoven fabric is formed by thermal bonding, it is easy to obtain a nonwoven fabric with uniform flexibility. .

作為分支狀低密度聚乙烯之密度(真密度),較佳為0.910g/cm3至0.930g/cm3。另外,分支狀低密度聚乙烯較佳為具有較直鏈狀低密度聚乙烯低5℃以上之融點,更佳為具有低10℃以上之融點。 The density (true density) of the branched low-density polyethylene is preferably 0.910 g/cm 3 to 0.930 g/cm 3 . Further, the branched low-density polyethylene preferably has a melting point lower than that of the linear low-density polyethylene by 5°C or more, and more preferably has a lower melting point by 10°C or more.

若考慮紡絲性,則分支狀低密度聚乙烯之熔體質量流率(MFR)較佳為1g/10min以上,更佳為3g/10min以上,又更佳為5g/10min以上,進而更佳為10g/10min以上,另外,較佳為60g/10min以下,更佳為50g/10min以下。MFR之測定方法係如上述所記載。 Considering the spinnability, the melt mass flow rate (MFR) of the branched low-density polyethylene is preferably 1 g/10min or more, more preferably 3 g/10min or more, still more preferably 5 g/10min or more, and even more It is 10 g/10min or more, and is preferably 60 g/10min or less, more preferably 50 g/10min or less. The measurement method of MFR is as described above.

關於芯鞘型複合纖維之鞘成分中的將直鏈狀低密度聚乙烯與分支狀低密度聚乙烯合計之含有比率,於鞘成分100質量%中,較佳為70質量%以上,更佳為80質量%以上,又更佳為90質量%以上。另外,於直鏈狀低密度聚乙烯與分支狀低密度聚乙烯之合計100質量%中,直鏈狀低 密度聚乙烯之比率較佳為75質量%以上,更佳為80質量%以上,另外,較佳為100質量%以下,更佳為95質量%以下,又更佳為90質量%以下。 The content ratio of the total of linear low-density polyethylene and branched low-density polyethylene in the sheath component of the core-sheath type conjugate fiber is preferably 70% by mass or more, more preferably 100% by mass of the sheath component. 80 mass % or more, and more preferably 90 mass % or more. In addition, in the total of 100 mass % of the linear low density polyethylene and the branched low density polyethylene, the linear low density polyethylene The ratio of density polyethylene is preferably 75 mass % or more, more preferably 80 mass % or more, and is preferably 100 mass % or less, more preferably 95 mass % or less, and still more preferably 90 mass % or less.

鞘成分亦可含有聚合物成分以外之添加劑,例如抗靜電劑、顏料、消光劑、熱穩定劑、光穩定劑、阻燃劑、抗菌劑、潤滑劑、塑化劑、柔軟劑、抗氧化劑、紫外線吸收劑、結晶成核劑等添加劑。於鞘成分100質量%中,這些添加劑較佳為以10質量%以下之量而含有於鞘成分中。 The sheath component may also contain additives other than the polymer component, such as antistatic agents, pigments, matting agents, heat stabilizers, light stabilizers, flame retardants, antibacterial agents, lubricants, plasticizers, softeners, antioxidants, Additives such as UV absorbers and crystal nucleating agents. These additives are preferably contained in the sheath component in an amount of 10% by mass or less based on 100% by mass of the sheath component.

芯鞘型複合纖維之芯成分係由任意之熱塑性樹脂所構成。再者,芯成分至少含有具有較直鏈狀低密度聚乙烯之融點高20℃以上之融點的熱塑性樹脂,該熱塑性樹脂之融點較佳為較直鏈狀低密度聚乙烯之融點高30℃以上,更佳為高40℃以上,又更佳為高50℃以上。芯成分係以提高不織布之蓬鬆性或體積恢復性之方式發揮作用。 The core component of the core-sheath type composite fiber is composed of any thermoplastic resin. Furthermore, the core component contains at least a thermoplastic resin having a melting point 20°C or more higher than the melting point of the linear low-density polyethylene, and the melting point of the thermoplastic resin is preferably higher than that of the linear low-density polyethylene. 30°C or higher, more preferably 40°C or higher, and still more preferably 50°C or higher. The core component functions to improve the bulkiness or volume recovery of the nonwoven fabric.

作為構成芯成分之熱塑性樹脂,可列舉:聚丙烯、聚丁烯(polybutene)、聚丁烯(polybutylene)、聚甲基戊烯、聚丁二烯及這些之共聚合物等聚烯烴系樹脂;這些尼龍66、尼龍12、尼龍6等聚醯胺系樹脂;聚(甲基)丙烯酸甲酯、聚(甲基)丙烯酸乙酯、乙烯-(甲基)丙烯酸甲酯共聚合物、乙烯-(甲基)丙烯酸共聚合物等丙烯酸系樹脂;聚乙酸乙烯酯、乙烯-乙酸乙烯酯共聚合物等乙烯酯系樹脂;聚乙烯 醇、乙烯-乙烯醇共聚合物等乙烯醇系樹脂;聚碳酸酯;聚縮醛;聚苯乙烯;環烯烴系樹脂等。這些可僅包含一種,亦可包含兩種以上。其中,就不織布之均一性及不織布之生產性之方面而言,較佳為聚烯烴系樹脂、聚酯系樹脂及聚醯胺系樹脂,更佳為聚酯系樹脂。聚酯系樹脂中,較佳為聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯,更佳為聚對苯二甲酸乙二酯。 Examples of the thermoplastic resin constituting the core component include polyolefin-based resins such as polypropylene, polybutene, polybutylene, polymethylpentene, polybutadiene, and copolymers thereof; Polyamide resins such as nylon 66, nylon 12, and nylon 6; polymethyl(meth)acrylate, polyethyl(meth)acrylate, ethylene-(meth)acrylate copolymer, ethylene-(meth)acrylate Acrylic resins such as meth)acrylic acid copolymers; vinyl ester resins such as polyvinyl acetate and ethylene-vinyl acetate copolymers; polyethylene Vinyl alcohol-based resins such as alcohols, ethylene-vinyl alcohol copolymers, etc.; polycarbonate; polyacetal; polystyrene; cycloolefin-based resins, etc. These may contain only 1 type, or may contain 2 or more types. Among them, polyolefin-based resins, polyester-based resins, and polyamide-based resins are preferred in terms of the uniformity of non-woven fabrics and the productivity of non-woven fabrics, and polyester-based resins are more preferred. Among polyester-based resins, polyethylene terephthalate and polybutylene terephthalate are preferred, and polyethylene terephthalate is more preferred.

芯成分較佳為含有上述所說明之熱塑性樹脂作為主成分,具體而言,於芯成分100質量%中,熱塑性樹脂(特別是聚酯系樹脂)之含有比率較佳為50質量%以上,更佳為60質量%以上,又更佳為75質量%以上。芯成分亦可僅含有上述所說明之熱塑性樹脂作為聚合物成分,例如亦可僅含有聚酯。 The core component preferably contains the thermoplastic resin described above as a main component, and specifically, the content ratio of the thermoplastic resin (especially polyester-based resin) in 100% by mass of the core component is preferably 50% by mass or more, more Preferably it is 60 mass % or more, More preferably, it is 75 mass % or more. The core component may contain only the thermoplastic resin described above as a polymer component, for example, only polyester may be contained.

芯成分亦可含有聚合物成分以外之添加劑,例如抗靜電劑、顏料、消光劑、熱穩定劑、光穩定劑、阻燃劑、抗菌劑、潤滑劑、塑化劑、柔軟劑、抗氧化劑、紫外線吸收劑、結晶成核劑等添加劑。於芯成分100質量%中,這些添加劑較佳為以10質量%以下之量而含有於芯成分中。 The core component may also contain additives other than the polymer component, such as antistatic agents, pigments, matting agents, heat stabilizers, light stabilizers, flame retardants, antibacterial agents, lubricants, plasticizers, softeners, antioxidants, Additives such as UV absorbers and crystal nucleating agents. These additives are preferably contained in the core component in an amount of 10% by mass or less in 100% by mass of the core component.

芯鞘型複合纖維中之芯成分/鞘成分之複合比(質量比)較佳為30/70以上,更佳為35/65以上,又更佳為40/60以上,另外,較佳為80/20以下,更佳為70/30 以下,又更佳為60/40以下。若芯成分/鞘成分之複合比處於此種範圍,則容易確保所得之不織布之強度及柔軟性,另外容易提高體積恢復性。 The composite ratio (mass ratio) of the core component/sheath component in the core-sheath composite fiber is preferably 30/70 or more, more preferably 35/65 or more, still more preferably 40/60 or more, and more preferably 80 /20 or less, preferably 70/30 Below, it is more preferable that it is 60/40 or less. When the composite ratio of the core component/sheath component is in such a range, the strength and flexibility of the obtained nonwoven fabric can be easily ensured, and the volume recovery property can be easily improved.

芯鞘型複合纖維係以芯成分與鞘成分實質上成為同芯之方式形成。亦即,係以於纖維剖面中芯成分之重心與纖維之重心實質上一致之方式形成。藉由使用同芯芯鞘型複合纖維,例如藉由在紡絲後以機械方式賦予捲縮,與使用偏芯芯鞘型複合纖維之情形相比,容易對芯鞘型複合纖維賦予任意之捲縮(捲縮數、捲縮率等)。另外,可獲得以下效果:於不織布加工時進行熱處理時等,於使用偏芯芯鞘型複合纖維之情形時產生質地之劣化,但於使用同芯芯鞘型複合纖維之情形時幾乎未見質地之劣化,所得之不織布之肌膚觸碰感變得良好。 The core-sheath type conjugate fiber is formed so that the core component and the sheath component become substantially the same core. That is, it is formed so that the center of gravity of a core component and the center of gravity of a fiber may correspond substantially in a fiber cross section. By using the concentric core-sheath type conjugate fiber, for example, by mechanically imparting crimp after spinning, it is easier to impart an arbitrary curl to the core-sheath type conjugate fiber than in the case of using an eccentric core-sheath type conjugate fiber. shrink (number of curls, curl rate, etc.). In addition, the following effects can be obtained: when the eccentric core-sheath type conjugate fiber is used, the texture is deteriorated when heat treatment is performed at the time of non-woven fabric processing, but almost no texture is seen when the concentric core-sheath type conjugate fiber is used. As it deteriorated, the nonwoven fabric obtained had a good touch against the skin.

同芯芯鞘型複合纖維較佳為具有捲縮。若同芯芯鞘型複合纖維具有捲縮,則可提高所得之不織布之蓬鬆性或緩衝性。作為同芯芯鞘型複合纖維之捲縮數,較佳為10個/25mm以上,更佳為12個/25mm以上,另外,較佳為30個/25mm以下,更佳為25個/25mm以下,又更佳為22個/25mm以下。同芯芯鞘型複合纖維之捲縮率較佳為10%以上,更佳為12%以上,另外,較佳為30%以下,更佳為25%以下,又更佳為20%以下。若同芯芯鞘型複合纖維具有此種捲縮數及捲縮率,則容易提高所得之不織布之蓬鬆 性或緩衝性。同芯芯鞘型複合纖維之捲縮數及捲縮率係依據JIS L 1015(2010)而測定。 The core-sheath type conjugate fiber preferably has crimps. If the core-sheath type composite fiber has crimps, the bulkiness or cushioning properties of the obtained nonwoven fabric can be improved. The number of crimps of the core-sheath type conjugate fiber is preferably 10 pieces/25mm or more, more preferably 12 pieces/25mm or more, and preferably 30 pieces/25mm or less, more preferably 25 pieces/25mm or less , and more preferably 22 pieces/25mm or less. The crimp rate of the core-sheath type composite fiber is preferably 10% or more, more preferably 12% or more, and more preferably 30% or less, more preferably 25% or less, and still more preferably 20% or less. If the core-sheath type composite fiber has such a number of crimps and a crimp rate, it is easy to improve the bulkiness of the obtained nonwoven fabric sex or buffering. The crimp number and the crimp rate of the core-sheath type conjugate fiber were measured in accordance with JIS L 1015 (2010).

同芯芯鞘型複合纖維之捲縮率/捲縮數之比(單位:%/(個/25mm))較佳為0.4以上,更佳為0.5以上,又更佳為0.8以上,另外,較佳為1.2以下,更佳為1.1以下,又更佳為1.0以下。若捲縮率/捲縮數之比處於此種範圍內,則捲縮不易伸長,同芯芯鞘型複合纖維具有適當大小之捲縮。另外,若使用此種捲縮纖維,則製造不織布時之生產性優異,並且容易提高所得之不織布之蓬鬆性或彈力性。 The ratio of the crimp rate to the number of crimps (unit: %/(piece/25mm)) of the core-sheath type composite fiber is preferably 0.4 or more, more preferably 0.5 or more, and still more preferably 0.8 or more. It is preferably 1.2 or less, more preferably 1.1 or less, and still more preferably 1.0 or less. If the ratio of the crimp ratio/the number of crimps is within this range, the crimp will not be easily elongated, and the core-core-sheath type composite fiber has an appropriate crimp. In addition, when such crimped fibers are used, the productivity when producing a nonwoven fabric is excellent, and the bulkiness and elasticity of the obtained nonwoven fabric are easily improved.

同芯芯鞘型複合纖維之纖度並無特別限定。同芯芯鞘型複合纖維之纖度例如較佳為1.1dtex以上,更佳為1.5dtex以上,另外,較佳為15dtex以下,更佳為10dtex以下,又更佳為5dtex以下。 The fineness of the core-sheath-type composite fiber is not particularly limited. The fineness of the core-sheath type conjugate fiber is, for example, preferably 1.1 dtex or more, more preferably 1.5 dtex or more, and more preferably 15 dtex or less, more preferably 10 dtex or less, and still more preferably 5 dtex or less.

同芯芯鞘型複合纖維之以短纖維計之纖維長例如較佳為1mm以上,更佳為3mm以上,又更佳為5mm以上,另外,較佳為100mm以下,更佳為72mm以下,又更佳為64mm以下。短纖維之纖維長之合適範圍亦依存於製造不織布時之網形成方式,例如於使用梳棉機形成網之情形時,短纖維之纖維長可為10mm以上,亦可為20mm以上, 亦可為30mm以上。於使用氣紡機形成網之情形時,短纖維之纖維長可為50mm以下。 The fiber length in terms of short fibers of the core-sheath type composite fiber is, for example, preferably 1 mm or more, more preferably 3 mm or more, and more preferably 5 mm or more, and more preferably 100 mm or less, more preferably 72 mm or less, and More preferably, it is 64 mm or less. The suitable range of the fiber length of the short fibers also depends on the method of forming the web when manufacturing the non-woven fabric. For example, in the case of using a carding machine to form the web, the fiber length of the short fibers may be 10 mm or more, and may also be 20 mm or more. It may be 30mm or more. In the case of forming a web using an air spinning machine, the fiber length of the short fibers may be 50 mm or less.

本發明之不織布亦可包含同芯芯鞘型複合纖維以外之纖維。作為其他纖維,可列舉:棉、絲、羊毛、麻、紙漿等天然纖維;嫘縈、銅胺嫘縈等再生纖維;聚烯烴系纖維、聚酯系纖維、丙烯酸系纖維、聚醯胺系纖維、聚胺酯系纖維等合成纖維。這些其他纖維可於不織布中僅包含一種,亦可包含兩種以上,可根據不織布之用途而適當選擇。再者,本發明之不織布較佳為包含上述所說明之同芯芯鞘型複合纖維作為主成分,具體而言,於不織布100質量%中,較佳為以50質量%以上之比率包含同芯芯鞘型複合纖維,更佳為70質量%以上,又更佳為80質量%以上。不織布亦可僅由上述同芯芯鞘型複合纖維所構成。 The nonwoven fabric of the present invention may also contain fibers other than the core-sheath composite fibers. Examples of other fibers include: natural fibers such as cotton, silk, wool, hemp, and pulp; regenerated fibers such as rayon and cupro rayon; polyolefin fibers, polyester fibers, acrylic fibers, and polyamide fibers , Polyurethane fibers and other synthetic fibers. Only one kind of these other fibers may be included in the nonwoven fabric, or two or more kinds thereof may be included, and may be appropriately selected according to the use of the nonwoven fabric. Furthermore, the nonwoven fabric of the present invention preferably contains the above-described concentric core-sheath type conjugate fiber as a main component, and specifically, in 100 mass % of the nonwoven fabric, it is preferable to contain the concentric core in a ratio of 50 mass % or more. The core-sheath type conjugate fiber is more preferably 70% by mass or more, still more preferably 80% by mass or more. The nonwoven fabric may be composed of only the above-mentioned core-sheath-type composite fibers.

包含上述同芯芯鞘型複合纖維之不織布之基重只要根據不織布之用途而適當設定即可,例如較佳為10g/m2以上,更佳為14g/m2以上,又更佳為18g/m2以上,另外,較佳為60g/m2以下,更佳為50g/m2以下,又更佳為45g/m2以下,進而更佳為40g/m2以下。 The basis weight of the non-woven fabric containing the above-mentioned core-sheath composite fibers can be appropriately set according to the application of the non-woven fabric, for example, preferably 10 g/m 2 or more, more preferably 14 g/m 2 or more, and more preferably 18 g/m m 2 or more, and preferably 60 g/m 2 or less, more preferably 50 g/m 2 or less, still more preferably 45 g/m 2 or less, and still more preferably 40 g/m 2 or less.

本發明之包含同芯芯鞘型複合纖維之短纖維不織布例如可如下般製造。 The staple fiber nonwoven fabric comprising the core-sheath-type composite fiber of the present invention can be produced, for example, as follows.

首先,使用成為鞘成分之直鏈狀低密度聚乙烯及成為芯成分之熱塑性樹脂,使用同芯複合噴嘴將這些兩個成分熔融紡絲,獲得同芯芯鞘型複合未延伸纖維。此時之鞘成分之紡絲溫度例如較佳為於200℃至300℃之範圍內調整,芯成分之紡絲溫度例如較佳為於240℃至350℃之範圍內調整。未延伸纖維之抽取速度例如只要於100m/min至1500m/min之範圍內調整即可。 First, using a linear low-density polyethylene serving as a sheath component and a thermoplastic resin serving as a core component, these two components are melt-spun using a core composite nozzle to obtain a core-core-sheath composite unstretched fiber. At this time, the spinning temperature of the sheath component is preferably adjusted, for example, within the range of 200°C to 300°C, and the spinning temperature of the core component is preferably adjusted, for example, within the range of 240°C to 350°C. The extraction speed of the unstretched fibers may be adjusted within the range of, for example, 100 m/min to 1500 m/min.

繼而,將該未延伸纖維加以延伸。此時之延伸倍率例如較佳為1.2倍以上,更佳為1.5倍以上,又更佳為1.8倍以上,進而更佳為2.0倍以上,另外,較佳為5.0倍以下,更佳為4.0倍以下,又更佳為3.8倍以下。 Next, the unstretched fibers are stretched. The stretching ratio at this time is, for example, preferably 1.2 times or more, more preferably 1.5 times or more, still more preferably 1.8 times or more, still more preferably 2.0 times or more, and preferably 5.0 times or less, more preferably 4.0 times Hereinafter, it is more preferably 3.8 times or less.

較佳為對如此所獲得之延伸纖維實施加熱處理。加熱處理例如可使用30℃至120℃左右之加熱介質或加熱裝置而進行。加熱處理之方法可列舉加熱輥、蒸氣處理等。經加熱處理之纖維可利用捲縮機而賦予捲縮。此時,利用夾持壓力及填充壓力(stuffing pressure)實施捲縮調整,但就對纖維適當賦予捲縮並且防止纖維斷裂之方面而言,即將捲縮前之纖維溫度較佳為設為30℃至70℃左右,另外,較佳為將捲縮輥之溫度設為30℃至90℃左右。賦予有捲縮之纖維係以不鬆弛狀態實施熱風加熱處理,並進行乾燥。將經熱風加熱處理之纖維係藉由進行冷卻、切斷,而獲得賦予有捲縮之同芯芯鞘型複合纖維之短纖維。如此而獲得之 複合纖維由於芯成分與鞘成分為同芯剖面且被賦予有充分之捲縮,故而形成蓬鬆性或緩衝性優異且均一質地之不織布。另外,亦容易於製造不織布時形成網。 It is preferable to heat-treat the drawn fiber thus obtained. The heat treatment can be performed using, for example, a heating medium or a heating device at about 30°C to 120°C. As the method of the heat treatment, heating rolls, steam treatment, and the like are exemplified. The heat-treated fibers can be imparted with crimp using a crimper. At this time, the crimp adjustment is performed by the clamping pressure and the stuffing pressure, but in terms of appropriately imparting crimp to the fiber and preventing fiber breakage, the fiber temperature immediately before crimping is preferably set to 30° C. In addition, it is preferable to set the temperature of the crimping roll to about 30 to 90 degreeC. The fibers to which crimps are imparted are subjected to a hot-air heat treatment in a non-slack state, and are then dried. The fibers subjected to the hot-air heating treatment are cooled and cut to obtain short fibers of concentric core-sheath composite fibers provided with crimps. thus obtained Since the core component and the sheath component have a concentric cross-section and sufficient crimp is imparted to the conjugate fiber, a nonwoven fabric having excellent bulkiness and cushioning properties and a uniform texture is formed. In addition, it is also easy to form a net when producing a nonwoven fabric.

將同芯芯鞘型複合纖維之短纖維形成網之方法並無特別限定,例如可列舉:平行網、半隨機網、隨機網、交叉網、十字交叉網等梳棉網方式;氣紡網方式;濕式抄紙網方式等。於形成纖維網時,亦可將同芯芯鞘型複合纖維之短纖維與其他纖維(例如聚烯烴系纖維、聚酯系纖維等合成纖維或者嫘縈、棉等天然或再生纖維等)混棉而形成網。 The method for forming the short fibers of the core-sheath type composite fiber into the web is not particularly limited, and examples thereof include carded web methods such as parallel webs, semi-random webs, random webs, crossed webs, and crisscrossed webs; air-laid webs. ; Wet papermaking net method, etc. When forming a fiber web, the short fibers of the core-sheath composite fibers can also be mixed with other fibers (such as synthetic fibers such as polyolefin fibers and polyester fibers, or natural or regenerated fibers such as rayon and cotton). form a network.

纖維間接著方法較佳為採用熱黏合(熱接著),因此本發明之不織布較佳為熱黏合不織布。作為熱黏合之方式,可採用透氣法或熱輥法。透氣法係將梳棉網等纖維網載置於通氣性之網狀物(net)或滾筒上,並噴附熱風,藉此使構成纖維之交點熱融著而製成不織布之方法。熱輥法係使梳棉網等纖維網通過經加熱至預定溫度之壓花輥與平滑輥之間、或一對平滑輥間並進行夾持,藉此使構成纖維之交點熱融著而製成不織布之方法。這些方法中,就容易獲得蓬鬆性或緩衝性優異之不織布之方面而言,較佳為使用透氣法。因此,本發明之不織布較佳為透氣不織布。於本發明之不織布之情形時,較佳為將複合纖維加熱至鞘成分之直鏈狀低密度聚乙烯之融點以上之溫度,將鞘成分熔融而使複合纖維彼此接合,作為此時之加熱溫度,例如較佳為125 ℃以上,更佳為128℃以上,另外,較佳為150℃以下,更佳為145℃以下。 The inter-fiber bonding method is preferably thermal bonding (thermal bonding), so the non-woven fabric of the present invention is preferably a thermal bonding non-woven fabric. As a method of thermal bonding, an air-through method or a hot roll method can be used. The air-permeable method is a method of placing a fiber web such as a carded net on a ventilated net or a drum, and spraying hot air, thereby thermally melting the intersection points of the constituent fibers to form a non-woven fabric. The hot roll method is to make fiber webs such as carded webs pass between an embossing roll heated to a predetermined temperature and a smoothing roll, or between a pair of smoothing rolls, and nipping, thereby making the intersection points of the constituent fibers. The method of non-woven fabric. Among these methods, it is preferable to use an air-permeable method because it is easy to obtain a nonwoven fabric excellent in bulkiness and cushioning properties. Therefore, the non-woven fabric of the present invention is preferably a breathable non-woven fabric. In the case of the nonwoven fabric of the present invention, it is preferable to heat the conjugate fibers to a temperature equal to or higher than the melting point of the linear low-density polyethylene of the sheath component, and to melt the sheath component to bond the conjugate fibers to each other, as the heating at this time. temperature, for example, preferably 125 °C or higher, more preferably 128°C or higher, and preferably 150°C or lower, more preferably 145°C or lower.

另外,本發明亦提供一種積層不織布,該積層不織布必須含有上述所說明之包含同芯芯鞘型複合纖維之短纖維不織布。本發明之積層不織布具有上述含有同芯芯鞘型複合纖維之短纖維不織布作為第一不織布層,進而具有由短纖維不織布所構成之第二不織布層。第二不織布層可與第一不織布層相同亦可不同。積層不織布中,較佳為第一不織布層主要成為與肌膚之接觸面。 In addition, the present invention also provides a laminated non-woven fabric which must contain the above-described short-fiber non-woven fabric including the core-sheath type composite fiber. The laminated nonwoven fabric of the present invention has the above-mentioned short fiber nonwoven fabric containing core-sheath composite fibers as a first nonwoven fabric layer, and further has a second nonwoven fabric layer composed of the short fiber nonwoven fabric. The second non-woven fabric layer may be the same as or different from the first non-woven fabric layer. In the laminated nonwoven fabric, it is preferable that the first nonwoven fabric layer mainly serves as the contact surface with the skin.

構成第二不織布層之纖維之種類並無特別限定,可列舉:棉、絲、羊毛、麻、紙漿等天然纖維;嫘縈、銅胺嫘縈等再生纖維;聚烯烴系纖維、聚酯系纖維、丙烯酸系纖維、聚醯胺系纖維、聚胺酯系纖維等合成纖維。這些纖維可僅包含一種,亦可包含兩種以上。構成第二不織布層之纖維不限定於由單成分構成之纖維,亦可為複合纖維(同芯或偏芯之芯鞘型複合纖維或並列(side by side)型複合纖維等)。作為構成複合纖維之各成分之樹脂,可列舉可構成上述所說明之同芯芯鞘型複合纖維之芯成分或鞘成分的熱塑性樹脂。構成第二不織布層之纖維可具有捲縮,亦可不具有捲縮。 The type of fibers constituting the second non-woven fabric layer is not particularly limited, and examples thereof include natural fibers such as cotton, silk, wool, hemp, and pulp; regenerated fibers such as rayon and cupro rayon; polyolefin-based fibers and polyester-based fibers , acrylic fibers, polyamide fibers, polyurethane fibers and other synthetic fibers. Only one kind of these fibers may be included, or two or more kinds may be included. The fibers constituting the second nonwoven layer are not limited to fibers composed of a single component, and may be composite fibers (co-core or eccentric core-sheath composite fibers, side-by-side composite fibers, etc.). Examples of the resin constituting each component of the conjugate fiber include thermoplastic resins that can form the core component or the sheath component of the above-described core-sheath-type conjugate fiber. The fibers constituting the second nonwoven layer may or may not have crimps.

第二不織布層之纖維網之形成方式並無特別限定,可採用上述所說明之網形成方式。纖維間接著方法亦無特別限定,可列舉熱黏合、化學黏合、水刺(spun lace)等。再者,就容易提高第二不織布層之蓬鬆性,另外確保通液性之方面而言,第二不織布層較佳為熱黏合不織布。 The formation method of the fiber web of the second non-woven fabric layer is not particularly limited, and the web formation method described above can be used. The inter-fiber bonding method is also not particularly limited, and examples thereof include thermal bonding, chemical bonding, and spun lace. Furthermore, the second non-woven layer is preferably a thermally bonded non-woven fabric in terms of easily improving the bulkiness of the second non-woven fabric layer and ensuring liquid permeability.

第二不織布層較佳為包含偏芯芯鞘型複合纖維或中空芯鞘型複合纖維之短纖維不織布。若第二不織布層如此般構成,則容易提高第二不織布層之蓬鬆性或緩衝性。於第二不織布層係由偏芯芯鞘型複合纖維所構成之情形時,該偏芯芯鞘型複合纖維例如較佳為鞘成分含有高密度聚乙烯,芯成分含有具有較高密度聚乙烯高20℃以上之融點的熱塑性樹脂。 The second non-woven fabric layer is preferably a short-fiber non-woven fabric comprising eccentric core-sheath composite fibers or hollow core-sheath composite fibers. If the second non-woven fabric layer is thus constituted, the bulkiness and cushioning properties of the second non-woven fabric layer can be easily improved. When the second non-woven fabric layer is composed of eccentric core-sheath composite fibers, the eccentric core-sheath composite fibers are preferably, for example, the sheath component contains high-density polyethylene, and the core component contains high-density polyethylene with high density. Thermoplastic resin with a melting point above 20°C.

於構成第二不織布層之纖維為合成纖維或複合纖維之情形時,該纖維亦可除了聚合物成分以外,含有抗靜電劑、顏料、消光劑、熱穩定劑、光穩定劑、阻燃劑、抗菌劑、潤滑劑、塑化劑、柔軟劑、抗氧化劑、紫外線吸收劑、結晶成核劑等添加劑。於纖維100質量%中,這些添加劑較佳為以10質量%以下之量而含有於纖維中。 When the fibers constituting the second non-woven fabric layer are synthetic fibers or composite fibers, the fibers may also contain antistatic agents, pigments, matting agents, heat stabilizers, light stabilizers, flame retardants, Antibacterial agents, lubricants, plasticizers, softeners, antioxidants, UV absorbers, crystal nucleating agents and other additives. These additives are preferably contained in the fibers in an amount of 10% by mass or less based on 100% by mass of the fibers.

第二不織布層之基重只要根據積層不織布之用途而適當設定即可,例如較佳為10g/m2以上,更佳為14g/m2以上,又更佳為18g/m2以上,另外,較佳為60g/m2以下, 更佳為50g/m2以下,又更佳為40g/m2以下,進而更佳為35g/m2以下。 The basis weight of the second non-woven fabric layer can be appropriately set according to the purpose of the laminated non-woven fabric, for example, preferably 10 g/m 2 or more, more preferably 14 g/m 2 or more, and more preferably 18 g/m 2 or more, and in addition, It is preferably 60 g/m 2 or less, more preferably 50 g/m 2 or less, still more preferably 40 g/m 2 or less, and still more preferably 35 g/m 2 or less.

第一不織布層之基重/第二不織布層之基重之比較佳為20/80以上,更佳為30/70以上,又更佳為35/65以上,另外,較佳為70/30以下,更佳為60/40以下,又更佳為55/45以下。藉由如此般調整第一不織布層及第二不織布層之基重,而容易使積層不織布之第一不織布層側之觸感柔軟,並且提高積層不織布之蓬鬆性或緩衝性。 The ratio of the basis weight of the first non-woven fabric layer/the basis weight of the second non-woven fabric layer is preferably 20/80 or more, more preferably 30/70 or more, still more preferably 35/65 or more, and preferably 70/30 or less. , more preferably below 60/40, still more preferably below 55/45. By adjusting the basis weights of the first non-woven fabric layer and the second non-woven fabric layer in this way, the touch of the first non-woven fabric layer side of the laminated non-woven fabric can be easily made soft, and the bulkiness or cushioning properties of the laminated non-woven fabric can be improved.

積層不織布較佳為第一不織布層之表觀密度大於第二不織布層之表觀密度。若如此般構成積層不織布,則於積層不織布吸收液體時,容易使液體迅速移動至第二不織布層,並且保持第一不織布層側之表面相對較乾爽,抑制自第二不織布層向第一不織布層之回滲(rewet)。各不織布層之表觀密度可藉由將基重除以厚度而求出。厚度係依據JIS L 1913(2010)使用厚度測定器而測定。 In the laminated nonwoven fabric, the apparent density of the first nonwoven fabric layer is preferably greater than the apparent density of the second nonwoven fabric layer. If the laminated non-woven fabric is constructed in this way, when the laminated non-woven fabric absorbs liquid, it is easy to quickly move the liquid to the second non-woven fabric layer, and the surface on the side of the first non-woven fabric layer is kept relatively dry, and the flow from the second non-woven fabric layer to the first non-woven fabric layer is suppressed. The rewet (rewet). The apparent density of each nonwoven layer can be obtained by dividing the basis weight by the thickness. The thickness is measured using a thickness measuring device in accordance with JIS L 1913 (2010).

第一不織布層較佳為顯示親水性。第二不織布層亦較佳為顯示親水性。例如,藉由利用親水劑對第一不織布層或第二不織布層之構成纖維進行處理,或由親水性纖維構成第一不織布層或第二不織布層,可使第一不織布層或第二不織布層形成為親水性。作為親水劑,可使用界面活性劑等。 The first nonwoven layer preferably exhibits hydrophilicity. It is also preferable that the second non-woven fabric layer exhibits hydrophilicity. For example, by treating the constituent fibers of the first non-woven fabric layer or the second non-woven fabric layer with a hydrophilic agent, or by forming the first non-woven fabric layer or the second non-woven fabric layer with hydrophilic fibers, the first non-woven fabric layer or the second non-woven fabric layer can be made formed to be hydrophilic. As the hydrophilic agent, a surfactant or the like can be used.

第一不織布層與第二不織布層亦能以親水化之程度互不相同之方式形成。例如,第一不織布層較佳為親水度形成得低於第二不織布層。或者,較佳為第一不織布層係藉由利用親水劑對疏水性纖維進行處理而形成為親水性,且第二不織布層係藉由以親水性纖維構成或利用親水劑對疏水性纖維進行處理而形成為親水性。藉此,於積層不織布吸收液體時,容易使液體迅速移動至第二不織布層,並且保持第一不織布層側之表面相對較乾爽,抑制自第二不織布層向第一不織布層之回滲。 The first non-woven fabric layer and the second non-woven fabric layer can also be formed in such a manner that the degree of hydrophilization is different from each other. For example, the first nonwoven fabric layer is preferably formed to have a lower hydrophilicity than the second nonwoven fabric layer. Alternatively, it is preferable that the first non-woven fabric layer is made hydrophilic by treating the hydrophobic fibers with a hydrophilic agent, and the second non-woven fabric layer is formed by using hydrophilic fibers or treating the hydrophobic fibers with a hydrophilic agent. and become hydrophilic. Thereby, when the laminated non-woven fabric absorbs liquid, it is easy to quickly move the liquid to the second non-woven fabric layer, and the surface on the side of the first non-woven fabric layer is kept relatively dry, and the back seepage from the second non-woven fabric layer to the first non-woven fabric layer is suppressed.

第一不織布層之構成纖維亦較佳為以如下方式形成:與第二不織布層之構成纖維相比,親水度更容易因與水接觸而降低。藉由如此般調整各層之構成纖維之親水度,可保持第一不織布層側之表面相對較乾爽,減少自第二不織布層向第一不織布層之回滲量。此時之各層之構成纖維之親水度之調整較佳為如下般進行。關於第一不織布層,較佳為使用含有非離子性界面活性劑之親水劑,具體而言,使用如聚氧乙烯烷基醚、聚氧乙烯脂肪酸酯、山梨醇酐脂肪酸酯般因與水接觸而相對較容易自纖維表面脫離之物質作為親水劑,並將該親水劑塗佈於疏水性纖維之表面。關於第二不織布層,較佳為作為親水劑,使用如聚甘油脂肪酸酯、聚醚-聚酯嵌段共聚合物、聚醚改性矽酮、環氧乙烷加成多元醇之脂肪酸酯般即便與水接觸亦不易自纖維表面 脫離之物質作為親水劑,並將該親水劑塗佈於疏水性纖維之表面,或將親水劑預先混練至纖維中。或者,可使用親水性之纖維或混合親水性之纖維作為第二不織布層之構成纖維。 The constituent fibers of the first non-woven fabric layer are also preferably formed in such a manner that the degree of hydrophilicity is more likely to decrease due to contact with water than the constituent fibers of the second non-woven fabric layer. By adjusting the hydrophilicity of the constituent fibers of each layer in this way, the surface on the side of the first non-woven fabric layer can be kept relatively dry, and the amount of rewet from the second non-woven fabric layer to the first non-woven fabric layer can be reduced. In this case, the adjustment of the hydrophilicity of the constituent fibers of each layer is preferably carried out as follows. For the first non-woven fabric layer, it is preferable to use a hydrophilic agent containing a nonionic surfactant, specifically, a hydrophilic agent such as polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, and sorbitan fatty acid ester. A substance that is relatively easily detached from the fiber surface in contact with water is used as a hydrophilic agent, and the hydrophilic agent is coated on the surface of the hydrophobic fiber. For the second non-woven fabric layer, it is preferable to use fatty acid such as polyglycerol fatty acid ester, polyether-polyester block copolymer, polyether-modified silicone, and ethylene oxide addition polyol as a hydrophilic agent. Ester-like, even in contact with water, it is not easy to get off the fiber surface The separated substance is used as a hydrophilic agent, and the hydrophilic agent is coated on the surface of the hydrophobic fibers, or the hydrophilic agent is premixed into the fibers. Alternatively, a hydrophilic fiber or a mixed hydrophilic fiber may be used as the constituent fiber of the second nonwoven layer.

於第一不織布層或第二不織布層中,為了調整這些層之親水性,亦可於各層中以0.1質量%至5質量%左右之比率調配棉纖維或嫘縈纖維。另外,為了提高不織布之隱蔽性,亦可於第一不織布層或第二不織布層之構成纖維中以3質量%以下之比率調配氧化鈦等顏料。 In the first non-woven fabric layer or the second non-woven fabric layer, in order to adjust the hydrophilicity of these layers, cotton fibers or rayon fibers can also be blended in each layer at a ratio of about 0.1 mass % to 5 mass %. In addition, in order to improve the concealment of the non-woven fabric, a pigment such as titanium oxide may be blended in the constituent fibers of the first non-woven fabric layer or the second non-woven fabric layer at a ratio of 3 mass % or less.

第一不織布層與第二不織布層較佳為藉由熱接著而彼此接合。詳細而言,較佳為藉由熱接著將第一不織布層之構成纖維與第二不織布層之構成纖維於彼此之接點或交點接合。若如此般將第一不織布層與第二不織布層接合,則容易蓬鬆地形成積層不織布,並且提高自第一不織布層向第二不織布層之通液性。作為將第一不織布層與第二不織布層熱接著之方法,可列舉以下方法:使用熱風貫通式熱處理機、熱風噴附式熱處理機、紅外線式熱處理機等熱處理裝置,以將第一不織布層與第二不織布層積層之狀態噴附熱風或進行氛圍加熱。 The first non-woven fabric layer and the second non-woven fabric layer are preferably bonded to each other by thermal bonding. Specifically, the constituent fibers of the first non-woven fabric layer and the constituent fibers of the second non-woven fabric layer are preferably joined at the joints or intersections with each other by thermal bonding. When the first nonwoven fabric layer and the second nonwoven fabric layer are joined in this way, the laminated nonwoven fabric can be easily formed in a bulky manner, and the liquid permeability from the first nonwoven fabric layer to the second nonwoven fabric layer can be improved. As a method of thermally bonding the first non-woven fabric layer and the second non-woven fabric layer, the following methods can be mentioned: using a heat treatment device such as a hot air through-type heat treatment machine, a hot air spray type heat treatment machine, an infrared heat treatment machine, etc. The state of the second non-woven fabric layered layer is sprayed with hot air or heated by atmosphere.

積層不織布之基重只要根據不織布之用途而適當選擇即可,例如較佳為20g/m2以上,更佳為28g/m2以上,又 更佳為35g/m2以上,另外,較佳為80g/m2以下,更佳為70g/m2以下,又更佳為65g/m2以下。另外,第一不織布層之基重較佳為積層不織布之基重之20%以上,更佳為30%以上,又更佳為40%以上,另外,較佳為75%以下,更佳為70%以下,又更佳為65%以下。 The basis weight of the laminated non - woven fabric can be appropriately selected according to the purpose of the non - woven fabric. 80 g/m 2 or less, more preferably 70 g/m 2 or less, still more preferably 65 g/m 2 or less. In addition, the basis weight of the first non-woven fabric layer is preferably 20% or more of the basis weight of the laminated non-woven fabric, more preferably 30% or more, still more preferably 40% or more, and more preferably 75% or less, more preferably 70% or more % or less, more preferably 65% or less.

於一個形態中,積層不織布可僅由第一不織布層及第二不織布層所構成。於另一形態中,積層不織布亦可具有將第一不織布層積層於第二不織布層之兩個面的構造。於又一形態中,積層不織布亦可具有將相同或不同之第二不織布層積層兩個以上之構造。 In one form, the laminated non-woven fabric may consist of only the first non-woven fabric layer and the second non-woven fabric layer. In another form, the laminated non-woven fabric may have a structure in which the first non-woven fabric layer is laminated on both surfaces of the second non-woven fabric layer. In another form, the laminated nonwoven fabric may have a structure in which two or more identical or different second nonwoven fabrics are laminated.

本發明之不織布及積層不織布具有柔軟之觸感,且肌膚觸碰感優異。進而,可於按壓不織布之表面時具有蓬鬆且綿軟之觸感,賦予適當之緩衝性或體積恢復性,故而可合適地用於觸碰肌膚之用途。本發明之不織布及積層不織布例如可用於拋棄式尿片、經期衛生棉、衛生護墊(pantyliner)、失禁護墊、陰唇間墊、母乳墊、動物用拋棄式尿片等吸收性物品;手術簾、紗布、繃帶、創傷面保護片、痔瘡用墊等醫療用不織布製品;濕紙巾、濕毛巾、卸妝巾、止汗巾、擦屁股濕巾等日常擦拭巾;面膜,冷感、溫感貼,貼膚使用之溫熱器具(例如拋棄式取暖片)等貼附劑之基布等。本發明之不織布及積層不織布尤其可合適地 應用於吸收性物品中所用之透液性之表面片材(頂部片材)。 The non-woven fabric and the laminated non-woven fabric of the present invention have a soft touch and are excellent in touch with the skin. Furthermore, when the surface of the non-woven fabric is pressed, it can have a fluffy and soft touch, and can provide appropriate cushioning properties or volume recovery properties, so it can be suitably used for touching the skin. The non-woven fabric and laminated non-woven fabric of the present invention can be used, for example, for absorbent articles such as disposable diapers, menstrual sanitary napkins, pantyliners, incontinence pads, interlabial pads, breast milk pads, disposable diapers for animals; surgical curtains , gauze, bandages, wound surface protection sheets, hemorrhoid pads and other medical non-woven products; wet wipes, wet towels, makeup removers, antiperspirant wipes, butt wipes and other daily wipes; facial masks, cold and warm stickers, The base cloth of the patch, such as the heating device (such as disposable heating sheet) used for skin application. The non-woven fabric and laminated non-woven fabric of the present invention are particularly suitable Liquid-permeable surface sheet (top sheet) used in absorbent articles.

本案主張基於2017年6月5日提出申請之日本特許申請案第2017-111148號之優先權之利益。將於2017年6月5日提出申請之日本特許申請案第2017-111148號之說明書之所有內容引用至本案中以供參考。 This case claims the benefit of priority based on Japanese Patent Application No. 2017-111148 filed on June 5, 2017. The entire contents of the specification of Japanese Patent Application No. 2017-111148, which will be filed on June 5, 2017, are incorporated herein by reference.

[實施例] [Example]

以下,列舉實施例對本發明加以更具體說明,但本發明當然不受下述實施例之限制,亦可於可符合上文、下文之主旨的範圍內適當加以變更而實施,這些變更均包含於本發明之技術範圍內。 Hereinafter, the present invention will be described in more detail by way of examples, but of course the present invention is not limited to the following examples, and can be implemented with appropriate modifications within the scope that can meet the gist of the above and below, and these modifications are included in the within the technical scope of the present invention.

(1)芯鞘型複合纖維之製造 (1) Manufacture of core-sheath composite fibers

(1-1)芯鞘型複合纖維A (1-1) Core-sheath type composite fiber A

使用直鏈狀低密度聚乙烯「Nipolon(註冊商標)-L M70」(東曹(Tosoh)股份有限公司製造,MFR20g/10min,密度0.936g/cm3,融點124℃)作為鞘成分,使用聚對苯二甲酸乙二酯(融點256℃,極限黏度值(IVp)0.64)作為芯成分,使用同芯複合噴嘴,將芯成分/鞘成分之複合比(質量比)設為60/40,以單孔噴出量0.60g/min、抽取速度1100m/min之條件將這些兩個成分熔融押出,獲得纖度為5.5dtex之長絲。將所得之紡絲長絲於70℃之浴槽內延伸 至2.7倍,獲得纖度為2.6dtex之延伸長絲。對延伸長絲賦予親水性油劑,利用填充函(stuffing box)型捲縮機賦予機械捲縮,利用100℃之熱風噴送裝置進行熱處理,以44mm之纖維長將長絲切斷,獲得同芯芯鞘型複合纖維之短纖維。所得之纖維之捲縮數為18個/25mm,捲縮率為15%。將纖維之製造條件及性質匯總於表1。 Linear low-density polyethylene "Nipolon (registered trademark)-L M70" (manufactured by Tosoh Co., Ltd., MFR 20g/10min, density 0.936g/cm 3 , melting point 124°C) was used as a sheath component, and used Polyethylene terephthalate (melting point 256°C, Intrinsic Viscosity (IVp) 0.64) was used as the core component, and a concentric composite nozzle was used, and the composite ratio (mass ratio) of the core component/sheath component was set to 60/40 , the two components were melted and extruded under the conditions of a single-hole ejection amount of 0.60 g/min and an extraction speed of 1100 m/min to obtain a filament with a fineness of 5.5 dtex. The obtained spinning filament was stretched to 2.7 times in a bath at 70° C. to obtain a stretched filament with a fineness of 2.6 dtex. The extended filaments are given a hydrophilic oil agent, mechanically crimped by a stuffing box type crimping machine, heat-treated with a hot air jet device at 100°C, and cut off the filaments with a fiber length of 44 mm to obtain the same product. Short fibers of core-core-sheath composite fibers. The number of crimps of the obtained fibers was 18 pieces/25mm, and the crimp rate was 15%. The manufacturing conditions and properties of the fibers are summarized in Table 1.

(1-2)芯鞘型複合纖維B (1-2) Core-sheath type composite fiber B

將芯成分/鞘成分之複合比(質量比)設為50/50,除此以外,以與芯鞘型複合纖維A相同之條件製造,獲得纖度2.7dtex、纖維長44mm、捲縮數17個/25mm、捲縮率12%之同芯芯鞘型複合纖維B。 Except that the composite ratio (mass ratio) of the core component/sheath component was set to 50/50, it was manufactured under the same conditions as the core-sheath type conjugated fiber A, to obtain a fineness of 2.7 dtex, a fiber length of 44 mm, and a number of crimps of 17. /25mm, crimp rate 12% of the same core-sheath type composite fiber B.

(1-3)芯鞘型複合纖維C (1-3) Core-sheath type composite fiber C

由高密度聚乙烯「Nipolonhard(註冊商標)」(東曹(Tosoh)股份有限公司製造,MFR20g/10min,密度0.964g/cm3,融點131℃)構成鞘成分之20質量%,且由直鏈狀低密度聚乙烯「Nipolon(註冊商標)-L M70」構成其餘80質量%,除此以外,以與同芯芯鞘型複合纖維A相同之條件進行製造,獲得纖度2.6dtex、纖維長44mm、捲縮數17個/25mm、捲縮率16%之同芯芯鞘型複合纖維C。 High-density polyethylene "Nipolonhard (registered trademark)" (manufactured by Tosoh Co., Ltd., MFR 20g/10min, density 0.964g/cm 3 , melting point 131°C) constitutes 20% by mass of the sheath component, and is composed of straight The chain-shaped low-density polyethylene "Nipolon (registered trademark)-L M70" constituted the remaining 80% by mass, and was manufactured under the same conditions as the core-sheath type conjugate fiber A, to obtain a fineness of 2.6 dtex and a fiber length of 44 mm. , Concentric core-sheath composite fiber C with 17 crimps/25mm and 16% crimp rate.

(1-4)芯鞘型複合纖維D (1-4) Core-sheath type composite fiber D

利用使芯偏離中心之偏芯剖面型複合噴嘴進行紡絲,除此以外,以與芯鞘型複合纖維A相同之條件進行製造,獲得纖度2.6dtex、纖維長44mm、捲縮數18個/25mm、捲縮率16%之偏芯芯鞘型複合纖維D。 Spinning was carried out using an eccentric profile type composite nozzle with a core off-center, and the same conditions as those of the core-sheath type composite fiber A were carried out except that the spinning was performed to obtain a fineness of 2.6 dtex, a fiber length of 44 mm, and a number of crimps of 18 pieces/25 mm. , Eccentric core sheath type composite fiber D with a crimp rate of 16%.

(1-5)芯鞘型複合纖維E (1-5) Core-sheath type composite fiber E

使用高密度聚乙烯「Nipolonhard(註冊商標)」作為鞘成分,除此以外,以與芯鞘型複合纖維A相同之條件進行製造,獲得纖度2.7dtex、纖維長38mm、捲縮數20個/25mm、捲縮率14%之同芯芯鞘型複合纖維E。 The high-density polyethylene "Nipolonhard (registered trademark)" was used as the sheath component, and it was produced under the same conditions as the core-sheath type conjugate fiber A to obtain a fineness of 2.7 dtex, a fiber length of 38 mm, and a number of crimps of 20/25 mm. , Concentric core-sheath composite fiber E with a crimp rate of 14%.

(1-6)芯鞘型複合纖維F (1-6) Core-sheath type composite fiber F

利用使芯偏離中心之偏芯剖面型複合噴嘴,且以單孔噴出量0.65g/min進行紡絲,除此以外,以與芯鞘型複合纖維E相同之條件進行製造,獲得纖度2.8dtex、纖維長43mm、捲縮數18個/25mm、捲縮率16%之偏芯芯鞘型複合纖維F。 The core-sheath-type composite fiber E was produced under the same conditions as the core-sheath composite fiber E, except that the spinning was performed at a single-hole discharge rate of 0.65 g/min using an eccentric cross-section type composite nozzle with a core off-center, to obtain a fineness of 2.8 dtex, The fiber length is 43mm, the number of crimps is 18/25mm, and the crimp rate is 16%. Eccentric core-sheath type composite fiber F.

(1-7)芯鞘型複合纖維G (1-7) Core-sheath type composite fiber G

將單孔噴出量設為0.55g/min,將抽取速度設為1500m/min,且將延伸倍率設為2.2倍,除此以外,以與芯鞘型複合纖維F相同之條件進行製造,獲得纖度2.3dtex、纖維長44mm、捲縮數19個/25mm、捲縮率16%之偏芯芯鞘型複合纖維G。 The production was carried out under the same conditions as the core-sheath type conjugate fiber F, except that the discharge rate per hole was set to 0.55 g/min, the extraction speed was set to 1500 m/min, and the draw ratio was set to 2.2 times, and the fineness was obtained. 2.3dtex, fiber length 44mm, crimp number 19/25mm, eccentric core sheath type composite fiber G with crimp rate 16%.

Figure 107118505-A0305-02-0028-1
Figure 107118505-A0305-02-0028-1

(2)不織布之製造 (2) Manufacturing of non-woven fabrics

分別利用平行梳棉機,使用芯鞘型複合纖維A至芯鞘型複合纖維E製作具有表2所示之基重之第一層纖維網,且使用芯鞘型複合纖維F、芯鞘型複合纖維G製作具有表2所示之基重之第二層纖維網。將第一層纖維網(第一不織布層)與第二層纖維網(第二不織布層)積層,使用熱風貫通式熱處理機於140℃進行10秒鐘熱處理,藉此獲得經熱接著之積層不織布。於熱處理中,以第一層纖維網之表面與熱處理機之通氣性金屬網狀物接觸之方式,將第一層纖維網與第二層纖維網之積層體配置於金屬網狀物上。 Using a parallel carding machine, respectively, the core-sheath composite fibers A to the core-sheath composite fibers E were used to make the first layer of fiber webs with the basis weight shown in Table 2, and the core-sheath composite fibers F and the core-sheath composite fibers were used. Fiber G made a second layer of web having the basis weight shown in Table 2. The first layer of fiber web (first non-woven fabric layer) and the second layer of fiber web (second non-woven fabric layer) were laminated, and heat-treated at 140° C. for 10 seconds using a hot-air through-type heat treatment machine to obtain a heat-bonded laminated non-woven fabric. . During the heat treatment, the laminate of the first layer of fiber web and the second layer of fiber web is arranged on the metal mesh in such a way that the surface of the first layer of fiber web is in contact with the air-permeable metal mesh of the heat treatment machine.

Figure 107118505-A0305-02-0030-2
Figure 107118505-A0305-02-0030-2

(3)評價及測定方法 (3) Evaluation and measurement methods

(3-1)厚度 (3-1) Thickness

使用厚度測定器以均一間隔對所製作之不織布進行測定,將n=10之平均值設為厚度。 The produced nonwoven fabric was measured at uniform intervals using a thickness measuring device, and the average value of n=10 was defined as the thickness.

(3-2)比容積 (3-2) Specific volume

將經測定厚度之不織布之面積乘以厚度,將所得之值除以不織布之質量,亦即,將不織布之厚度除以基重,藉此算出比容積。比容積之倒數成為表觀密度。 The specific volume is calculated by multiplying the area of the non-woven fabric whose thickness has been measured by the thickness, and dividing the obtained value by the mass of the non-woven fabric, that is, dividing the thickness of the non-woven fabric by the basis weight. The inverse of the specific volume becomes the apparent density.

(3-3)回滲 (3-3) Rewet

將尤妮佳(Unicharm)股份有限公司製造之Lifely安心吸尿墊(註冊商標)之上層不織布剝離,於剩餘之吸收體上載置一張衛生紙(tissue paper),於該衛生紙上以第一層纖維網成為上側之方式設置積層不織布,使積層不織布吸收80g人工尿,放置5分鐘。然後,於吸收了人工尿之部分重疊濾紙,於該濾紙上載置3.5kg之砝碼3分鐘。此時之荷重係設為3.5kg/(15cm×15cm)。取下砝碼,測定吸收了人工尿之濾紙之重量,將減去濾紙重量所得之量作為回滲量。將該順序進行2次,分別求出第一次回滲量及第二次回滲量。 Peel off the upper non-woven fabric of the Lifely Urine Absorbent Pad (registered trademark) manufactured by Unicharm Co., Ltd., place a piece of tissue paper on the remaining absorbent body, and place the first layer of fiber on the toilet paper. The layered non-woven fabric was installed so that the net became the upper side, and the layered non-woven fabric was allowed to absorb 80 g of artificial urine and left for 5 minutes. Then, the filter paper was overlapped on the part which absorbed the artificial urine, and the weight of 3.5 kg was placed on the filter paper for 3 minutes. The load at this time is set to 3.5kg/(15cm×15cm). Remove the weight, measure the weight of the filter paper that has absorbed the artificial urine, and use the amount obtained by subtracting the weight of the filter paper as the rewet amount. This procedure was performed twice, and the first rewet amount and the second rewet amount were obtained, respectively.

(3-4)不織布之質感 (3-4) Texture of non-woven fabric

使10人作為監視員進行官能試驗,並按以下之評價基準對不織布之質感進行評分,算出該評分之平均分。官能試驗之項目係設為柔軟度及肌膚觸碰感,以製造例7之不織布之質感為基準。 The sensory test was performed by 10 persons as monitors, and the texture of the nonwoven fabric was scored according to the following evaluation criteria, and the average score of the scores was calculated. The items of the sensory test were set as softness and skin touch, and were based on the texture of the nonwoven fabric of Production Example 7.

+5-良好 +5 - good

+4-稍良好 +4 - slightly better

+3-不置可否(製造例7) +3 - Noncommittal (Manufacturing Example 7)

+2稍差 +2 slightly worse

+1-差 +1 - bad

(4)結果 (4) Results

製造例1至製造例6中所得之不織布具有包含同芯芯鞘型複合纖維之短纖維不織布,其中上述同芯芯鞘型複合纖維含有直鏈狀低密度聚乙烯作為鞘成分。因此,以手觸碰不織布時之柔軟度及肌膚觸碰感優異。製造例1至製造例6之不織布中,第一層之比容積小於第二層,亦即第一層之表觀密度大於第二層的製造例1至製造例5之不織布係回滲量少。另一方面,製造例7、製造例8中所得之不織布不具有包含同芯芯鞘型複合纖維之短纖維不織布,其中上述同芯芯鞘型複合纖維含有直鏈狀低密度聚乙烯作為鞘成分(製造例7係第一層包含偏芯芯鞘型複合纖維之不織布,製造例8係第一層包含含有高密度聚乙烯作為鞘成分之芯鞘型複合纖維的不織布),因此於以手觸碰不織布時,柔軟度或肌膚觸碰感稍差。 The nonwoven fabrics obtained in Production Examples 1 to 6 have short fiber nonwoven fabrics comprising core-sheath-type conjugate fibers containing linear low-density polyethylene as a sheath component. Therefore, when the nonwoven fabric is touched by hand, it is excellent in softness and skin touch. In the non-woven fabrics of Production Examples 1 to 6, the specific volume of the first layer is smaller than that of the second layer, that is, the apparent density of the first layer is greater than that of the second layer. The non-woven fabrics of Production Examples 1 to 5 have less rewet . On the other hand, the nonwoven fabrics obtained in Production Example 7 and Production Example 8 did not have the staple fiber nonwoven fabric containing the core-sheath-type conjugate fibers, wherein the core-sheath-type conjugate fibers contained linear low-density polyethylene as a sheath component (Manufacturing Example 7 is a non-woven fabric whose first layer contains eccentric core-sheath type conjugate fibers, and Manufacturing Example 8 is a non-woven fabric whose first layer contains core-sheath type conjugate fibers containing high-density polyethylene as a sheath component.) When touching non-woven fabrics, the softness or skin touch is slightly less.

(產業可利用性) (Industrial Availability)

本發明之不織布及積層不織布可用於吸收性物品、醫療用不織布製品、日常擦拭巾、貼附劑之基布等。 The non-woven fabric and laminated non-woven fabric of the present invention can be used for absorbent articles, medical non-woven fabric products, daily wipes, base fabrics for adhesives, and the like.

Claims (7)

一種積層不織布,係具有第一不織布層以及第二不織布層;前述第一不織布層為包含同芯芯鞘型複合纖維之短纖維不織布,前述同芯芯鞘型複合纖維之鞘成分含有直鏈狀低密度聚乙烯,芯成分含有具有較前述直鏈狀低密度聚乙烯高20℃以上之融點的熱塑性樹脂;前述第二不織布層為包含偏芯芯鞘型複合纖維或是中空芯鞘型複合纖維之短纖維不織布,前述偏芯芯鞘型複合纖維之鞘成分含有高密度聚乙烯,芯成分含有具有較前述高密度聚乙烯高20℃以上之融點的熱塑性樹脂。 A laminated non-woven fabric is provided with a first non-woven fabric layer and a second non-woven fabric layer; the aforementioned first non-woven fabric layer is a short-fiber non-woven fabric comprising a core-sheath composite fiber, and the sheath component of the aforementioned core-sheath composite fiber contains a linear Low-density polyethylene, the core component contains a thermoplastic resin with a melting point 20°C higher than that of the linear low-density polyethylene; the second non-woven fabric layer is composed of eccentric core-sheath composite fibers or hollow core-sheath composite fibers In the short fiber nonwoven fabric of fibers, the sheath component of the eccentric core-sheath composite fiber contains high-density polyethylene, and the core component contains a thermoplastic resin having a melting point 20°C higher than that of the high-density polyethylene. 如請求項1所記載之積層不織布,其中前述第一不織布層之鞘成分進而含有高密度聚乙烯。 The laminated nonwoven fabric according to claim 1, wherein the sheath component of the first nonwoven fabric layer further contains high-density polyethylene. 如請求項1或2所記載之積層不織布,其中前述同芯芯鞘型複合纖維之捲縮數為10個/25mm至30個/25mm,捲縮率為10%至30%。 The laminated nonwoven fabric according to claim 1 or 2, wherein the number of crimps of the aforementioned concentric core-sheath type conjugate fibers is 10 pieces/25mm to 30 pieces/25mm, and the crimp rate is 10% to 30%. 如請求項1或2所記載之積層不織布,其中前述第一不織布層之表觀密度大於前述第二不織布層之表觀密度。 The laminated nonwoven fabric according to claim 1 or 2, wherein the apparent density of the first nonwoven fabric layer is greater than the apparent density of the second nonwoven fabric layer. 如請求項1或2所記載之積層不織布,其中前述第一不織布層及前述第二不織布層之基重分別為10g/m2至60g/m2The laminated nonwoven fabric according to claim 1 or 2, wherein the basis weights of the first nonwoven fabric layer and the second nonwoven fabric layer are respectively 10 g/m 2 to 60 g/m 2 . 如請求項3所記載之積層不織布,其中前述第一不織布層及前述第二不織布層之基重分別為10g/m2至60g/m2The laminated nonwoven fabric according to claim 3, wherein the basis weights of the first nonwoven fabric layer and the second nonwoven fabric layer are respectively 10 g/m 2 to 60 g/m 2 . 如請求項4所記載之積層不織布,其中前述第一不織布層及前述第二不織布層之基重分別為10g/m2至60g/m2The laminated nonwoven fabric according to claim 4, wherein the basis weights of the first nonwoven fabric layer and the second nonwoven fabric layer are respectively 10 g/m 2 to 60 g/m 2 .
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