CN110637117B - Non-woven fabric - Google Patents
Non-woven fabric Download PDFInfo
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- CN110637117B CN110637117B CN201880033078.XA CN201880033078A CN110637117B CN 110637117 B CN110637117 B CN 110637117B CN 201880033078 A CN201880033078 A CN 201880033078A CN 110637117 B CN110637117 B CN 110637117B
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- nonwoven fabric
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING 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
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-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
- D04H1/54—Non-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
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
- D04H1/5412—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres sheath-core
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING 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
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-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
- D04H1/42—Non-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
- D04H1/4282—Addition polymers
- D04H1/4291—Olefin series
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING 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
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-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
- D04H1/54—Non-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
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
- D04H1/5418—Mixed 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)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Multicomponent Fibers (AREA)
Abstract
A nonwoven fabric comprising a short fiber nonwoven fabric of a concentric sheath type conjugate fiber, wherein the sheath component of the concentric sheath type conjugate fiber contains a linear low-density polyethylene, and the core component contains a thermoplastic resin having a melting point higher than that of the linear low-density polyethylene by 20 ℃ or higher. A laminated nonwoven fabric comprises the nonwoven fabric as a 1 st nonwoven fabric layer and a 2 nd nonwoven fabric layer comprising a short fiber nonwoven fabric.
Description
Technical Field
The present invention relates to a nonwoven fabric, and more particularly, to a short fiber nonwoven fabric comprising a concentric sheath type conjugate fiber, and a laminated nonwoven fabric comprising the short fiber nonwoven fabric.
Background
Conventionally, various nonwoven fabrics have been known. For example, patent document 1 discloses a nonwoven fabric obtained by laminating and thermocompression bonding a nonwoven web a formed of synthetic long fibers having a core-sheath structure in which the melting point of the core component polymer is higher than that of the sheath component polymer, and a nonwoven web B formed of synthetic long fibers having a core-sheath structure in which the melting point of the core component polymer is higher than that of the sheath component polymer and the melting point of the sheath component polymer is higher than that of the long fibers. Patent document 2 discloses a nonwoven fabric using a thermally bondable conjugate fiber, which is a concentric sheath-core type fabric in which the sheath component is a polyolefin and the core component is a polyester having a melting point higher than the melting point of the polyolefin by 20 ℃The thermal bonding conjugate fiber according to (1), wherein the thermal bonding conjugate fiber is a thermal bonding conjugate fiber having a crimp imparted thereto and having a crimp number (number/25 mm) of 12 to 19, a crimp rate (%) of 10 to 20, and a crimp/crimp number of 0.8 to 1.1. Patent document 3 discloses a nonwoven fabric produced by a hot air method, the nonwoven fabric having a 1 st layer and a 2 nd layer, the density of the 2 nd layer being lower than the density of the 1 st layer, wherein at least the fibers contained in the 1 st layer have a flat cross section, the long axis direction of the cross section of the fibers is substantially oriented in the plane direction of the nonwoven fabric, the average deviation SMD of the surface roughness of the 1 st layer side surface is 2.5 μm or less, the average deviation MMD of the friction coefficient is lower than 0.008, the linearity LC of the compression characteristics of the nonwoven fabric is 0.3 or less, and the bending rigidity B is 0.03cN · cm2Less than/cm.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 4-316654
Patent document 2: japanese patent laid-open publication No. 2003-41439
Patent document 3: japanese patent laid-open publication No. 2006-233364
Disclosure of Invention
Problems to be solved by the invention
As described above, various nonwoven fabrics have been known in the past, and their applications are also diversified. For example, nonwoven fabrics containing synthetic fibers made of thermoplastic resins are used for sheets for absorbent articles such as disposable diapers and sanitary napkins. When nonwoven fabrics are used for such applications, the nonwoven fabrics are used so as to be in direct contact with the skin, and therefore, a good touch feeling is desired.
The present invention has been made in view of the above circumstances, and an object thereof is to provide: a nonwoven fabric having a soft touch and excellent skin contactability.
Means for solving the problems
The present invention includes the following inventions.
[1] A non-woven fabric is characterized in that the non-woven fabric is a short fiber non-woven fabric containing concentric sheath type composite fibers,
the sheath component of the concentric sheath-core composite fiber contains a linear low-density polyethylene, and the core component contains a thermoplastic resin having a melting point higher than that of the linear low-density polyethylene by 20 ℃ or more.
[2] The nonwoven fabric according to [1], wherein the number of crimps of the concentric sheath-core composite fiber is 10 to 30/25 mm, and the crimp ratio is 10 to 30%.
[3] A laminated nonwoven fabric characterized in that,
having the nonwoven fabric of [1] or [2] as the 1 st nonwoven fabric layer,
further comprises a 2 nd nonwoven fabric layer containing a short fiber nonwoven fabric.
[4] The laminated nonwoven fabric according to item [3], wherein the apparent density of the 1 st nonwoven fabric layer is larger than the apparent density of the 2 nd nonwoven fabric layer.
[5]According to [3]Or [4]]The laminated nonwoven fabric described above, wherein the basis weights of the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer are 10 to 60g/m, respectively2。
ADVANTAGEOUS EFFECTS OF INVENTION
The nonwoven fabric of the present invention is composed of a concentric sheath-core type composite fiber containing a linear low-density polyethylene as a sheath component, and therefore has a soft touch and excellent skin contactability.
Detailed Description
The nonwoven fabric of the present invention is a short fiber nonwoven fabric comprising a concentric sheath type composite fiber, wherein the sheath component of the concentric sheath type composite fiber contains a linear low-density polyethylene, and the core component contains a thermoplastic resin having a melting point higher by 20 ℃ or more than the melting point of the linear low-density polyethylene. The nonwoven fabric of the present invention is composed of a concentric sheath-core type composite fiber containing a linear low-density polyethylene as a sheath component, and therefore has a soft touch and excellent skin contactability. Therefore, the nonwoven fabric of the present invention can be suitably used as a member on the skin contact side of an absorbent article such as a disposable diaper or a sanitary product, a medical nonwoven fabric product such as a surgical towel (drape) or gauze, a wet tissue, a wet towel, or the like. The nonwoven fabric of the present invention will be described in detail below.
The linear low-density polyethylene constituting the sheath component of the core-sheath composite fiber functions to impart a soft touch to the fiber surface and to provide good skin contact properties when formed into a nonwoven fabric. The linear low-density polyethylene constituting the sheath component of the core-sheath composite fiber is only required to contain ethylene (-CH)2-CH2-) as the repeating unit, a linear (co) polymer is not particularly limited, and a copolymer of ethylene and an α -olefin having 3 or more carbon atoms is preferable in terms of easiness in improving the flexibility of the fiber. Examples of the α -olefin having 3 or more carbon atoms include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 4-methyl-1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, and 1-dodecene. These α -olefins may contain only 1 kind, or may contain 2 or more kinds. The number of carbons in the α -olefin is preferably 4 or more, and more preferably 12 or less, even more preferably 8 or less, and still more preferably 6 or less. Among these, the α -olefin is preferably propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 4-methyl-1-hexene, 1-octene, and more preferably 1-butene or 1-hexene.
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 preferably 10 mol% or less, more preferably 5 mol% or less. By setting the content of the α -olefin in the linear low-density polyethylene to 1 mol% or more, the flexibility of the fiber can be easily improved. On the other hand, if the content of the α -olefin is large, crystallinity is deteriorated, and fibers are easily fused to each other in the case of fiberization, and therefore, the content of the α -olefin in the linear low-density polyethylene is preferably 10 mol% or less.
The density (true density) of the linear low-density polyethylene is preferably 0.900g/cm3Above, more preferably 0.905g/cm3Above, more preferably 0.910g/cm3More preferably 0.913g/cm3Above, and preferably 0.945g/cm3Less, more preferably 0.940g/cm3Hereinafter, more preferably 0.938g/cm3The following. Straight chainThe density of the low density polyethylene is 0.900g/cm3In the above case, bulkiness and bulkiness recovery properties are easily imparted to the nonwoven fabric. In addition, the high-speed carding property is excellent when the nonwoven fabric is manufactured. The linear low-density polyethylene has a density of 0.945g/cm3Hereinafter, the surface touch in forming the nonwoven fabric is easily improved, and the flexibility in the thickness direction of the nonwoven fabric is easily ensured.
The melting point of the linear low-density polyethylene is preferably 110 ℃ to 128 ℃. When the melting point of the linear low-density polyethylene is 110 ℃ or higher, the surface texture of the nonwoven fabric is easily improved even when the nonwoven fabric is produced by thermal bonding at a high temperature. In addition, when a nonwoven fabric is produced, high-speed carding performance is excellent, and the obtained nonwoven fabric has good uniformity (or good texture). When the melting point of the linear low-density polyethylene is 128 ℃ or lower, a nonwoven fabric having a strength enough to withstand practical use can be easily obtained even when the nonwoven fabric is produced by thermal bonding at a low temperature.
The Melt Flow Rate (MFR) of the linear low-density polyethylene is preferably 1g/10 min or more, more preferably 2g/10 min or more, further preferably 3g/10 min or more, further more preferably 5g/10 min or more, and further preferably 60g/10 min or less, more preferably 40g/10 min or less, further preferably 35g/10 min or less, further more preferably 30g/10 min or less. If the MFR of the linear low-density polyethylene is 1g/10 min or more, spinnability is good, and if the MFR of the linear low-density polyethylene is 60g/10 min or less, fusion between fibers is not likely to occur during fiber production, and formation of single fibers is easy. MFR was measured in accordance with JIS K6922-1 (1997) (conditions: 190 ℃ C., load 21.18N (2.16 kgf)).
The ratio Mw/Mn of the weight average molecular weight (Mw) to the number average molecular weight (Mn) in 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. The lower limit of the Mw/Mn ratio of the linear low-density polyethylene is not particularly limited, but is usually 1.5 or more, and may be 2.0 or more, or 2.5 or more.
The flexural modulus of the linear low-density polyethylene is preferably 65MPa or more, more preferably 120MPa or more, further preferably 180MPa or more, further more preferably 250MPa or more, and is preferably 850MPa or less, more preferably 750MPa or less, further preferably 700MPa or less, and further more preferably 650MPa or less, from the viewpoint of improving the surface touch of the obtained nonwoven fabric and ensuring bulkiness. Flexural modulus was measured according to JIS K7171 (2008). When the linear low-density polyethylene has a flexural modulus of 65MPa or more, bulkiness and elasticity can be easily imparted to the resulting nonwoven fabric. On the other hand, if the flexural modulus of the linear low-density polyethylene is 850MPa or less, the resulting nonwoven fabric tends to have a soft surface feel.
The linear low-density polyethylene preferably has a durometer Hardness (HDD) of 45 or more, more preferably 48 or more, further preferably 50 or more, and further preferably 75 or less, more preferably 70 or less, further preferably 65 or less, further more preferably 62 or less. The durometer Hardness (HDD) was measured by using a D-type durometer in accordance with JIS K7215 (1986). When the linear low-density polyethylene has a durometer Hardness (HDD) of 45 or more, it becomes easy to impart bulkiness to the obtained nonwoven fabric or to impart bulkiness-recovering properties thereto. In addition, it becomes easy to ensure the passage of the carding machine when manufacturing the fibers. When the linear low-density polyethylene has a durometer Hardness (HDD) of 75 or less, the resulting nonwoven fabric tends to have a soft surface feel.
The linear low-density polyethylene can be easily obtained, for example, as follows: can be easily obtained by (co) polymerizing a monomer component containing ethylene with a metallocene catalyst or a Ziegler-Natta catalyst. Preferably, the linear low-density polyethylene is produced by copolymerizing ethylene with an α -olefin.
The sheath component of the core-sheath composite fiber may contain a polymer component other than the linear low-density polyethylene. 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 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.
Examples of the polymer component other than the linear low-density polyethylene that can be contained in the sheath component include polyolefin resins such as high-density polyethylene, branched low-density polyethylene, polypropylene, polybutylene (polybutylene), polymethylpentene, polybutadiene, and copolymers thereof; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate, and copolymers thereof; polyamide resins such as nylon 66, nylon 12, and nylon 6; acrylic resins such as polymethyl (meth) acrylate, polyethyl (meth) acrylate, ethylene-methyl (meth) acrylate copolymers, and ethylene-meth (acrylic acid) copolymers; vinyl ester resins such as polyvinyl acetate and ethylene-vinyl acetate copolymers; vinyl alcohol resins such as polyvinyl alcohol and ethylene-vinyl alcohol copolymers; a polycarbonate; a polyacetal; polystyrene; cycloolefin resins, and the like. These resins may contain only 1 kind, or may contain 2 or more kinds. Among these, the sheath component preferably further contains a branched low-density polyethylene, whereby flexibility in the thickness direction of the nonwoven fabric can be improved. Further, by including the branched low-density polyethylene in the sheath component, it is possible to process a nonwoven fabric in a wide temperature range, and for example, in the case of forming a nonwoven fabric by thermal bonding, a nonwoven fabric having uniform flexibility can be easily obtained.
The density (true density) of the branched low-density polyethylene is preferably 0.910g/cm3～0.930g/cm3. The branched low-density polyethylene preferably has a melting point lower by 5 ℃ or more than that of the linear low-density polyethylene, and more preferably has a melting point lower by 10 ℃ or more than that of the linear low-density polyethylene.
In view of spinnability, the Melt Flow Rate (MFR) of the branched low density polyethylene is preferably 1g/10 min or more, more preferably 3g/10 min or more, still more preferably 5g/10 min or more, still more preferably 10g/10 min or more, and further preferably 60g/10 min or less, and still more preferably 50g/10 min or less. The measurement method of MFR is as described above.
The total content ratio of the linear low density polyethylene and the branched low density polyethylene in the sheath component of the core-sheath composite fiber is preferably 70 mass% or more, more preferably 80 mass% or more, and further preferably 90 mass% or more of 100 mass% of the sheath component. In addition, the ratio of the linear low density polyethylene is preferably 75% by mass or more, more preferably 80% by mass or more, and further preferably 100% by mass or less, more preferably 95% by mass or less, and further preferably 90% by mass or less, of the total 100% by mass of the linear low density polyethylene and the branched low density polyethylene.
The sheath component may contain additives other than the polymer component, such as antistatic agents, pigments, delustering agents, heat stabilizers, light stabilizers, flame retardants, antibacterial agents, lubricants, plasticizers, softeners, antioxidants, ultraviolet absorbers, crystallization nucleating agents, and the like. 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.
The core component of the core-sheath composite fiber is composed of an arbitrary thermoplastic resin. The core component contains at least a thermoplastic resin having a melting point of 20 ℃ or higher than the melting point of the linear low-density polyethylene, and the melting point of the thermoplastic resin is preferably 30 ℃ or higher, more preferably 40 ℃ or higher, and still more preferably 50 ℃ or higher than the melting point of the linear low-density polyethylene. The core component acts to improve bulkiness and bulkiness recovery of the nonwoven fabric.
Examples of the thermoplastic resin constituting the core component include polyolefin resins such as polypropylene, polybutylene (polybutylene), polymethylpentene, polybutadiene, and copolymers thereof; polyolefin resins such as polyethylene, polypropylene, polybutylene (polybutylene), polymethylpentene, polybutadiene, and copolymers thereof; polyamide resins such as nylon 66, nylon 12, and nylon 6; acrylic resins such as polymethyl (meth) acrylate, polyethyl (meth) acrylate, ethylene-methyl (meth) acrylate copolymers, and ethylene-meth (acrylic acid) copolymers; vinyl ester resins such as polyvinyl acetate and ethylene-vinyl acetate copolymers; vinyl alcohol resins such as polyvinyl alcohol and ethylene-vinyl alcohol copolymers; a polycarbonate; a polyacetal; polystyrene; cycloolefin resins, and the like. They may contain only 1 species or 2 or more species. Among these, polyolefin-based resins, polyester-based resins, and polyamide-based resins are preferable, and polyester-based resins are more preferable, from the viewpoint of uniformity of the nonwoven fabric and productivity of the nonwoven fabric. Among the polyester resins, polyethylene terephthalate and polybutylene terephthalate are preferable, and polyethylene terephthalate is more preferable.
The core component preferably contains the thermoplastic resin described above as a main component, and specifically, the content ratio of the thermoplastic resin (particularly, polyester resin) in 100% by mass of the core component is preferably 50% by mass or more, more preferably 60% by mass or more, and further preferably 75% by mass or more. The core component may contain only the thermoplastic resin described above as a polymer component, and may contain only polyester, for example.
The core component may contain additives other than the polymer component, such as antistatic agents, pigments, delustering agents, heat stabilizers, light stabilizers, flame retardants, antibacterial agents, lubricants, plasticizers, softeners, antioxidants, ultraviolet absorbers, crystallization nucleating agents, and the like. 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.
The composite ratio (mass ratio) of the core component/the sheath component in the core-sheath composite fiber is preferably 30/70 or more, more preferably 35/65 or more, further preferably 40/60 or more, and preferably 80/20 or less, more preferably 70/30 or less, further preferably 60/40 or less. When the composite ratio of the core component/the sheath component is in such a range, the strength and flexibility of the nonwoven fabric to be obtained can be easily secured, and the bulkiness recovery property can be easily improved.
The core-sheath composite fiber is formed such that the core component and the sheath component are substantially concentric. That is, the fiber cross section is formed such that the center of gravity of the core component substantially coincides with the center of gravity of the fiber. By using the same-core-sheath composite fiber, for example, a crimp is mechanically imparted after spinning, and thus it becomes easier to impart an arbitrary crimp (the number of crimps, the crimp ratio, and the like) to the core-sheath composite fiber than in the case of using the eccentric-core-sheath composite fiber. In addition, when the core-offset sheath type composite fiber is used, for example, when heat treatment is performed during processing of the nonwoven fabric, deterioration of texture is hardly observed in the case of using the core-in sheath type composite fiber, and a good effect of improving skin contact property of the obtained nonwoven fabric can be obtained.
The corespun sheath-type composite fiber preferably has crimp. If the sheath-core type composite fiber has crimp, bulkiness and cushioning properties of the nonwoven fabric obtained can be improved. The number of crimps in the concentric sheath-core composite fiber is preferably 10 crimps/25 mm or more, more preferably 12 crimps/25 mm or more, and further preferably 30 crimps/25 mm or less, more preferably 25 crimps/25 mm or less, and further preferably 22 crimps/25 mm or less. The crimp ratio of the concentric core-sheath composite fiber is preferably 10% or more, more preferably 12% or more, and preferably 30% or less, more preferably 25% or less, and further preferably 20% or less. If the concentric core-sheath composite fiber has such a number of crimps and crimping rate, the bulkiness and cushioning properties of the resulting nonwoven fabric can be easily improved. The number of crimps and the crimp ratio of the concentric core-sheath type composite fiber were measured in accordance with JIS L1015 (2010).
The ratio of the crimp ratio/the number of crimps (unit:%/(number/25 mm)) of the concentric core-sheath composite fiber is preferably 0.4 or more, more preferably 0.5 or more, further preferably 0.8 or more, and preferably 1.2 or less, more preferably 1.1 or less, further preferably 1.0 or less. If the ratio of the crimp ratio to the number of crimps is within such a range, the crimps are not easily elongated, and the concentric core-sheath composite fiber has a crimp of an appropriate size. Further, if such crimped fibers are used, the nonwoven fabric can be produced with excellent productivity, and the bulkiness and elasticity of the nonwoven fabric can be easily improved.
The fineness of the coresheath composite fiber is not particularly limited. The fineness of the concentric core-sheath type composite fiber is, for example, preferably 1.1dtex or more, more preferably 1.5dtex or more, and preferably 15dtex or less, more preferably 10dtex or less, and further preferably 5dtex or less.
The fiber length of the short fiber as the concentric core-sheath type composite fiber is, for example, preferably 1mm or more, more preferably 3mm or more, and further preferably 5mm or more, and preferably 100mm or less, more preferably 72mm or less, and further preferably 64mm or less. The suitable range of the fiber length of the short fibers also depends on the web formation method in the production of the nonwoven fabric, and in the case of web formation by a carding machine, for example, the fiber length of the short fibers may be 10mm or more, may be 20mm or more, and may be 30mm or more. In the case of web formation by an air-laid machine, the fiber length of the short fibers may be 50mm or less.
The nonwoven fabric of the present invention may contain fibers other than the concentric core sheath type composite fiber. Examples of the other fibers include natural fibers such as cotton, silk, wool, hemp, and pulp; regenerated fibers such as rayon and cuprammonium fibers; synthetic fibers such as polyolefin-based fibers, polyester-based fibers, acrylic fibers, polyamide-based fibers, and polyurethane-based fibers. These other fibers may be contained in the nonwoven fabric by only 1 kind, or may be contained in 2 or more kinds, and may be appropriately selected depending on the use of the nonwoven fabric. The nonwoven fabric of the present invention preferably contains the concentric core-sheath composite fiber described above as a main component, and specifically, 100% by mass of the nonwoven fabric preferably contains the concentric core-sheath composite fiber at a ratio of 50% by mass or more, more preferably 70% by mass or more, and still more preferably 80% by mass or more. The nonwoven fabric may be composed of only the concentric sheath-core type composite fiber.
The basis weight of the nonwoven fabric comprising the concentric sheath-core type composite fiber can be suitably set according to the use of the nonwoven fabric, and is preferably 10g/m2Above, more preferably 14g/m2Above, more preferably 18g/m2Above, and preferably 60g/m2Below, more preferably 50g/m2Hereinafter, more preferably 45g/m2Hereinafter, more preferably 40g/m2The following.
The short fiber nonwoven fabric including the concentric sheath type composite fiber of the present invention can be produced, for example, as follows.
First, these 2 components were melt-spun using a linear low-density polyethylene as a sheath component and a thermoplastic resin as a core component by a concentric composite nozzle to obtain a concentric sheath-core composite undrawn fiber. The spinning temperature of the sheath component in this case is preferably adjusted, for example, within a range of 200 to 300 ℃, and the spinning temperature of the core component is preferably adjusted, for example, within a range of 240 to 350 ℃. The drawing speed of the undrawn fiber can be adjusted, for example, within a range of 100 m/min to 1500 m/min.
Subsequently, the undrawn fiber is drawn. The stretch ratio in this case is, for example, preferably 1.2 times or more, more preferably 1.5 times or more, further preferably 1.8 times or more, further more preferably 2.0 times or more, and further preferably 5.0 times or less, more preferably 4.0 times or less, further preferably 3.8 times or less.
The drawn fiber thus obtained is preferably subjected to a heat treatment. The heat treatment can be performed, for example, by using a heating medium or a heating apparatus having a temperature of about 30 to 120 ℃. Examples of the heat treatment include heating rolls and steam treatment. The heat treated fibers may be crimped with a crimper. In this case, although the crimp adjustment is performed under the nip pressure and the stuffer box pressure, the fiber temperature in front of the crimper is preferably about 30 to 70 ℃, and the temperature of the crimping roller is preferably about 30 to 90 ℃ in order to properly impart crimp to the fiber and prevent fiber breakage. The crimped fibers are subjected to hot air heating treatment in an unstrained state and dried. The fiber after the hot air heating treatment is cooled and cut, and thus a short fiber of a concentric core sheath type composite fiber to which a crimp is imparted can be obtained. In the composite fiber thus obtained, the core component and the sheath component have the same core cross section and are imparted with sufficient crimp. Therefore, a nonwoven fabric having a uniform texture and excellent bulkiness and cushioning properties is provided. Further, the web formation in the production of the nonwoven fabric is also facilitated.
The method for forming a web of the short fibers of the concentric core-sheath type composite fiber is not particularly limited, and examples thereof include a card web system such as a parallel web, a semi-random web, a cross web, and a cross web; an air-laid mode; wet paper web systems, and the like. In the formation of the fiber web, short fibers of the concentric sheath-core type conjugate fibers may be mixed with other fibers (for example, synthetic fibers such as polyolefin-based fibers and polyester-based fibers, natural or regenerated fibers such as rayon and cotton) to form a web.
The method of bonding fibers to each other is preferably thermal bonding (thermal bonding), and therefore the nonwoven fabric of the present invention is preferably a thermally bonded nonwoven fabric. As the method of thermal bonding, a hot air method or a hot roll method can be used. The hot air method comprises the following steps: a fiber web such as a card web is placed on an air-permeable web or drum, and hot air is blown to fuse the intersection points of the fibers, thereby forming a nonwoven fabric. The hot roll method is as follows: a fiber web such as a card web is passed between an embossing roll and a smoothing roll heated to a predetermined temperature or between a pair of smoothing rolls and sandwiched therebetween, and the intersection points of the fibers are thermally welded to form a nonwoven fabric. Among these methods, the hot air method is preferably used because a nonwoven fabric having excellent bulkiness and cushioning properties can be easily obtained. Therefore, the nonwoven fabric of the present invention is preferably a through-air nonwoven fabric. In the case of the nonwoven fabric of the present invention, it is preferable that the conjugate fibers are heated to a temperature of not lower than the melting point of the linear low-density polyethylene of the sheath component to melt the sheath component and join the conjugate fibers, and the heating temperature in this case is, for example, not lower than 125 ℃, more preferably not lower than 128 ℃, and preferably not higher than 150 ℃, more preferably not higher than 145 ℃.
The present invention also provides a laminated nonwoven fabric which essentially contains a short fiber nonwoven fabric comprising the homocore sheath type composite fiber described above. The laminated nonwoven fabric of the present invention has a short fiber nonwoven fabric comprising the concentric sheath type conjugate fiber as a 1 st nonwoven fabric layer, and further has a 2 nd nonwoven fabric layer comprising a short fiber nonwoven fabric. The 2 nd nonwoven fabric layer may be the same as or different from the 1 st nonwoven fabric layer. In the laminated nonwoven fabric, the 1 st nonwoven fabric layer is preferably mainly a skin-contacting surface.
The type of fibers constituting the 2 nd nonwoven 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 cuprammonium fibers; synthetic fibers such as polyolefin-based fibers, polyester-based fibers, acrylic fibers, polyamide-based fibers, and polyurethane-based fibers. These fibers may contain only 1 kind, or may contain 2 or more kinds. The fibers constituting the 2 nd nonwoven fabric layer are not limited to fibers formed of a single component, and may be composite fibers (core-sheath composite fibers of the same core or offset core, side-by-side composite fibers, and the like). Examples of the resin constituting each component of the composite fiber include thermoplastic resins that can constitute the core component or the sheath component of the concentric core-sheath composite fiber described above. The fibers constituting the 2 nd nonwoven layer may or may not have crimp.
The formation method of the fiber web of the 2 nd nonwoven fabric layer is not particularly limited, and the web formation method described above can be employed. The method of bonding between fibers is not particularly limited, and examples thereof include thermal bonding, chemical bonding, and hydroentangling. The heat-bondable nonwoven fabric is preferable for the 2 nd nonwoven fabric layer in terms of easily improving the bulkiness of the 2 nd nonwoven fabric layer and ensuring liquid permeability.
The 2 nd nonwoven fabric layer is preferably a short fiber nonwoven fabric containing core-sheath type composite fibers and hollow core-sheath type composite fibers. With such a configuration of the 2 nd nonwoven fabric layer, the bulkiness and cushioning properties of the 2 nd nonwoven fabric layer can be easily improved. When the 2 nd nonwoven fabric layer is composed of the core-sheath-offset composite fiber, the core-sheath-offset composite fiber preferably contains, for example, high-density polyethylene as a sheath component and a thermoplastic resin having a melting point higher by 20 ℃ or more than that of the high-density polyethylene as a core component.
When the fibers constituting the 2 nd nonwoven fabric layer are synthetic fibers or composite fibers, the fibers may contain additives such as antistatic agents, pigments, delustering agents, heat stabilizers, light stabilizers, flame retardants, antibacterial agents, lubricants, plasticizers, softeners, antioxidants, ultraviolet absorbers, and crystal nucleating agents in addition to the polymer component. These additives are preferably contained in the fiber in an amount of 10% by mass or less based on 100% by mass of the fiber.
The basis weight of the 2 nd nonwoven fabric layer can be suitably set according to the use of the laminated nonwoven fabric, and is, for example, preferable10g/m2Above, more preferably 14g/m2Above, more preferably 18g/m2Above, and preferably 60g/m2Below, more preferably 50g/m2Hereinafter, more preferably 40g/m2Hereinafter, more preferably 35g/m2The following.
The ratio of the weight per unit area of the 1 st nonwoven fabric layer/the weight per unit area of the 2 nd nonwoven fabric layer is preferably 20/80 or more, more preferably 30/70 or more, further preferably 35/65 or more, and preferably 70/30 or less, more preferably 60/40 or less, further preferably 55/45 or less. By adjusting the basis weights of the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer in this manner, the laminated nonwoven fabric can be easily made soft to the touch on the 1 st nonwoven fabric layer side, and the bulk and cushioning properties of the laminated nonwoven fabric can be easily improved.
The laminated nonwoven fabric preferably has an apparent density of the 1 st nonwoven fabric layer larger than that of the 2 nd nonwoven fabric layer. When the laminated nonwoven fabric is configured in this manner, the laminated nonwoven fabric absorbs liquid, and the surface on the 1 st nonwoven fabric layer side is kept dry while the liquid is rapidly transferred to the 2 nd nonwoven fabric layer, so that liquid return (rewet) from the 2 nd nonwoven fabric layer to the 1 st nonwoven fabric layer is easily suppressed. The apparent density of each nonwoven fabric layer can be determined by dividing the weight per unit area by the thickness. The thickness was measured by a thickness measuring instrument in accordance with JIS L1913 (2010).
The 1 st nonwoven layer preferably exhibits hydrophilicity. The 2 nd nonwoven layer preferably exhibits hydrophilicity as well. For example, the fibers constituting the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer may be treated with a hydrophilizing agent, or the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer may be formed of hydrophilic fibers, so that the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer may be made hydrophilic. As the hydrophilizing agent, a surfactant or the like can be used.
The 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer may be formed in such a manner that the degrees of hydrophilization are different from each other. For example, the 1 st nonwoven fabric layer is preferably formed to have a lower degree of hydrophilization than the 2 nd nonwoven fabric layer. Alternatively, it is preferable that the 1 st nonwoven fabric layer is rendered hydrophilic by treating the hydrophobic fibers with a hydrophilizing agent, and the 2 nd nonwoven fabric layer is made of hydrophilic fibers, or the hydrophobic fibers are rendered hydrophilic by treating the hydrophobic fibers with a hydrophilizing agent. Thus, when the laminated nonwoven fabric absorbs liquid, the liquid is rapidly transferred to the 2 nd nonwoven fabric layer while the surface on the 1 st nonwoven fabric layer side is kept relatively dry, and liquid return from the 2 nd nonwoven fabric layer to the 1 st nonwoven fabric layer is easily suppressed.
The constituent fibers of the 1 st nonwoven fabric layer are preferably formed so that the degree of hydrophilization is more likely to decrease in contact with water than the constituent fibers of the 2 nd nonwoven fabric layer. By adjusting the degree of hydrophilization of the constituent fibers of each layer in this manner, the surface on the 1 st nonwoven fabric layer side can be kept relatively dry, and the amount of liquid returning from the 2 nd nonwoven fabric layer to the 1 st nonwoven fabric layer can be reduced. The degree of hydrophilization of the constituent fibers of each layer is preferably adjusted as follows. The nonwoven fabric layer 1 is preferably coated with a hydrophilizing agent containing a nonionic surfactant, specifically, a substance which is easily released from the fiber surface in contact with water, such as polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, or sorbitan fatty acid ester, as the hydrophilizing agent. The nonwoven fabric layer 2 is coated on the surface of the hydrophobic fibers or the hydrophilizing agent is kneaded into the fibers beforehand, using as the hydrophilizing agent a substance that is not easily detached from the fiber surface even when it comes into contact with water, such as a polyglycerin fatty acid ester, a polyether-polyester block copolymer, a polyether-modified silicone, or a fatty acid ester of ethylene oxide-added polyol. Alternatively, hydrophilic fibers may be used as the constituent fibers of the 2 nd nonwoven fabric layer, or hydrophilic fibers may be mixed.
In the 1 st nonwoven fabric layer or the 2 nd nonwoven fabric layer, cotton fibers or rayon fibers may be blended in each layer at a ratio of about 0.1 to 5 mass% for the purpose of adjusting the hydrophilicity of these layers. For the purpose of improving the concealing property of the nonwoven fabric, a pigment such as titanium oxide may be added to the constituent fibers of the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer in a proportion of 3 mass% or less.
The 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer are preferably joined to each other by thermal bonding. Specifically, the constituent fibers of the 1 st nonwoven fabric layer and the constituent fibers of the 2 nd nonwoven fabric layer are preferably joined at the contact points or intersection points by thermal bonding. If the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer are joined in this manner, the laminated nonwoven fabric can be formed in a bulky manner, and liquid permeability from the 1 st nonwoven fabric layer to the 2 nd nonwoven fabric layer can be easily improved. As a method for thermally bonding the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer, there can be mentioned: hot air is blown or the atmosphere is heated in a state where the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer are laminated by using a heat treatment apparatus such as a through-hot-air heat treatment apparatus, a hot-air blowing heat treatment apparatus, or an infrared heat treatment apparatus.
The weight per unit area of the laminated nonwoven fabric can be suitably selected depending on the use of the nonwoven fabric, and is preferably 20g/m2Above, more preferably 28g/m2Above, more preferably 35g/m2Above, and preferably 80g/m2Below, more preferably 70g/m2Hereinafter, more preferably 65g/m2The following. The weight per unit area of the 1 st nonwoven fabric layer is preferably 20% or more, more preferably 30% or more, further preferably 40% or more, and preferably 75% or less, more preferably 70% or less, further preferably 65% or less of the weight per unit area of the laminated nonwoven fabric.
In one embodiment, the laminated nonwoven fabric may be composed of only the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer. In another embodiment, the laminated nonwoven fabric may have a structure in which the 1 st nonwoven fabric layer is laminated on both surfaces of the 2 nd nonwoven fabric layer. In a further embodiment, the laminated nonwoven fabric may have a structure in which the same or different 2 nd nonwoven fabric layer 2 or more are laminated.
The nonwoven fabric and the laminated nonwoven fabric of the present invention have a soft touch and are excellent in skin contact properties. Furthermore, the nonwoven fabric has a bulky and soft touch when pressed against the surface, and can provide appropriate cushioning properties and bulky recovery properties, and therefore, can be suitably used for applications in contact with the skin. The nonwoven fabric and the laminated nonwoven fabric of the present invention can be used, for example, for: absorbent articles such as disposable diapers, sanitary napkins, panty liners, incontinence pads, interlabial pads, breast pads, animal disposable diapers, and the like; medical nonwoven fabric products such as surgical drapes, gauze, bandages, wound surface protective sheets, hemorrhoid pads and the like; wet paper towels, wet towels, makeup remover sheets, perspiration removing sheets, toilet paper and the like; a mask, a cold and warm pad, and a base fabric for a patch such as a heater used in contact with the skin (e.g., a disposable heater). The nonwoven fabric and the laminated nonwoven fabric of the present invention are particularly suitable for use in a liquid-permeable topsheet (topsheet) used in an absorbent article.
The present application claims benefits based on priority of japanese patent application No. 2017-111148, applied 6/5/2017. The entire contents of the specification of the japanese patent application No. 2017-111148, applied on 6/5/2017, are incorporated by reference into the present application.
Examples
The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to the following examples, and can be carried out by appropriately changing the examples within the scope conforming to the gist described above and below, and these examples are included in the scope of protection of the present invention.
(1) Production of core-sheath composite fiber
(1-1) core-sheath type composite fiber A
As the sheath component, linear low-density polyethylene "Nipolon (registered trademark) -L M70" (manufactured by Tosoh corporation, MFR20g/10 min, density 0.936 g/cm)3Melting point 124 ℃ C.), polyethylene terephthalate (melting point 256 ℃ C., intrinsic viscosity (IVp)0.64) was used as a core component, and melt extrusion was performed on these 2 components by a concentric compounding nozzle under conditions such that the compounding ratio (mass ratio) of the core component/sheath component was 60/40, the discharge amount per hole was 0.60 g/min, and the take-up speed was 1100 m/min, to obtain filaments having a fineness of 5.5 dtex. The obtained spun single fiber was stretched in a bath at 70 ℃ to 2.7 times to obtain a stretched single fiber having a fineness of 2.6 dtex. The drawn single fibers were subjected to a hydrophilic finish, mechanical crimping by a stuffer box crimper, and heat treatment by a 100 ℃ hot air blower to cut the single fibers into a fiber length of 44mm, thereby obtaining a short fiber of a concentric sheath type composite fiber. The fiber obtained had a crimp number of 18/25 mm and a crimp rate of 15%. Conditions for producing the fibersAnd the properties are summarized in Table 1.
(1-2) core-sheath type composite fiber B
A sheath-core type composite fiber B having a fineness of 2.7dtex, a fiber length of 44mm, a crimp number of 17/25 mm and a crimp rate of 12% was obtained under the same conditions as those for the sheath-core type composite fiber A except that the core component/sheath component composite ratio (mass ratio) was 50/50.
(1-3) core-sheath type composite fiber C
High-density polyethylene "NIPOLONHARD (registered trademark)" (manufactured by Tosoh corporation, MFR20g/10 min, density 0.964g/cm3Melting point 131 ℃ C. for 20% by mass of the sheath component, and 80% by mass of the remainder was composed of linear low-density polyethylene "Nipolon (registered trademark) -L M70", and the same conditions as those for the concentric sheath type composite fiber A were used to produce a concentric sheath type composite fiber C having a fineness of 2.6dtex, a fiber length of 44mm, a crimp number of 17/25 mm, and a crimp ratio of 16%.
(1-4) core-sheath type composite fiber D
An eccentric core-sheath composite fiber D having a fineness of 2.6dtex, a fiber length of 44mm, a crimp number of 18/25 mm, and a crimp ratio of 16% was obtained under the same conditions as those of the core-sheath composite fiber A except that the core was spun using an eccentric core-cross-section composite nozzle having an offset center.
(1-5) core-sheath type composite fiber E
A concentric sheath type conjugate fiber E having a fineness of 2.7dtex, a fiber length of 38mm, a crimp number of 20/25 mm and a crimp ratio of 14% was obtained under the same conditions as those for the core sheath type conjugate fiber A except that a high-density polyethylene "NIPOLONHARD (registered trademark)" was used as the sheath component.
(1-6) core-sheath type composite fiber F
An eccentric core-sheath composite fiber F having a fineness of 2.8dtex, a fiber length of 43mm, a crimp number of 18/25 mm and a crimp rate of 16% was obtained under the same conditions as for the core-sheath composite fiber E except that the core was spun using an eccentric core-section composite nozzle having an eccentric center and a single hole discharge amount of 0.65 g/min.
(1-7) core-sheath type composite fiber G
A core-sheath-offset composite fiber G having a fineness of 2.3dtex, a fiber length of 44mm, a crimp number of 19/25 mm and a crimp ratio of 16% was produced under the same conditions as those for the core-sheath composite fiber F except that the single-hole discharge amount was 0.55G/min, the take-up speed was 1500 m/min and the draw ratio was 2.2 times.
[ Table 1]
The LLDPE is linear low-density polyethylene HDPE and the HDPE is high-density polyethylene
(2) Manufacture of non-woven fabrics
Separately, a layer 1 web having a weight per unit area shown in table 2 was produced from the core-sheath composite fibers a to E by a parallel carding machine, and a layer 2 web having a weight per unit area shown in table 2 was produced from the core-sheath composite fiber F, G by a parallel carding machine. The 1 st fiber web (1 st nonwoven fabric layer) and the 2 nd fiber web (2 nd nonwoven fabric layer) were laminated, and heat-treated at 140 ℃ for 10 seconds by a hot-air through-type heat treatment machine to obtain a heat-bonded laminated nonwoven fabric. In the heat treatment, a laminate of the 1 st layer web and the 2 nd layer web was disposed on the metal mesh so that the surface of the 1 st layer web was in contact with the air-permeable metal mesh of the heat treatment machine.
[ Table 2]
(3) Evaluation and measurement method
(3-1) thickness
The thickness of the nonwoven fabric was measured at regular intervals by a thickness measuring device, and the average value of n-10 was defined as the thickness.
(3-2) specific volume
The specific volume was calculated by multiplying the area of the nonwoven fabric having the measured thickness by the thickness and dividing the product by the mass of the nonwoven fabric, i.e., the thickness of the nonwoven fabric divided by the weight per unit area. The reciprocal of the specific volume becomes the apparent density.
(3-3) reverse osmosis
An upper layer nonwoven fabric of Life-free urine collection mat (registered trademark) manufactured by unichard Corporation was peeled off, 1 piece of tissue paper was placed on the remaining absorbent body, and a laminated nonwoven fabric was placed thereon so that the 1 st layer web became an upper side, and 80g of artificial urine was absorbed, and the sheet was left to stand for 5 minutes. Then, the filter paper was overlapped on the portion where the artificial urine was absorbed, and a weight of 3.5kg was placed thereon for 3 minutes. The load applied at this time was 3.5kg/(15 cm. times.15 cm). The weight was removed, the weight of the filter paper having absorbed the artificial urine was measured, and the weight of the filter paper was subtracted, and the obtained amount was defined as the rewet amount. The same procedure was carried out 2 times, and the 1 st and 2 nd rewet amounts were obtained, respectively.
(3-4) hand feeling of nonwoven Fabric
The sensory test was conducted by 10 persons, and the hand feeling of the nonwoven fabric was scored on the following evaluation criteria to calculate the average score. The items of the sensory test are referred to as softness and skin-contactability, and the hand of the nonwoven fabric of production example 7 is used as a reference.
+ 5-good
+ 4-slightly good
+ 3-all not (preparation example 7)
+ 2-slightly worse
+ 1-difference
(4) Results
The nonwoven fabrics obtained in production examples 1 to 6 each had a short fiber nonwoven fabric comprising a concentric sheath type conjugate fiber containing a linear low-density polyethylene as a sheath component. Therefore, the nonwoven fabric is excellent in flexibility and skin-contactability when touched with a hand. Among the nonwoven fabrics of production examples 1 to 6, the nonwoven fabrics of production examples 1 to 5, in which the layer 1 has a smaller specific volume than the layer 2, that is, the layer 1 has a larger apparent density than the layer 2, have a smaller amount of rewet. On the other hand, since the nonwoven fabrics obtained in production examples 7 and 8 were not short fiber nonwoven fabrics including a concentric core-sheath type conjugate fiber containing linear low-density polyethylene as a sheath component (production example 7 was a nonwoven fabric including a core-sheath type conjugate fiber in the 1 st layer, and production example 8 was a nonwoven fabric including a core-sheath type conjugate fiber in the 1 st layer containing high-density polyethylene as a sheath component), flexibility and skin contact property were slightly deteriorated when the nonwoven fabrics were touched with a hand.
Industrial applicability
The nonwoven fabric and the laminated nonwoven fabric of the present invention can be used for absorbent articles, medical nonwoven fabric products, base fabrics for personal wiping sheets and patches, and the like.
Claims (4)
1. A laminated nonwoven fabric comprising a 1 st nonwoven fabric layer and a 2 nd nonwoven fabric layer,
the 1 st non-woven fabric layer is a short fiber non-woven fabric containing concentric core sheath type composite fibers,
the sheath component of the concentric sheath-core composite fiber contains a linear low-density polyethylene, the core component contains a thermoplastic resin having a melting point higher than the linear low-density polyethylene by 20 ℃ or higher,
the 2 nd non-woven fabric layer is a short fiber non-woven fabric containing core-offset sheath type composite fibers or hollow core sheath type composite 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 higher than the high-density polyethylene by 20 ℃ or higher.
2. The laminated nonwoven fabric according to claim 1, wherein the concentric sheath-core composite fiber has a crimp number of 10 to 30/25 mm and a crimp ratio of 10 to 30%.
3. The laminated nonwoven fabric according to claim 1 or 2, wherein the apparent density of the 1 st nonwoven fabric layer is greater than the apparent density of the 2 nd nonwoven fabric layer,
the apparent density is determined by dividing the weight per unit area by the thickness.
4. A laminated nonwoven fabric as claimed in claim 1 or 2, wherein the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer are singleThe weight of the bit area is 10 to 60g/m2。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-111148 | 2017-06-05 | ||
| JP2017111148 | 2017-06-05 | ||
| PCT/JP2018/019818 WO2018225512A1 (en) | 2017-06-05 | 2018-05-23 | Nonwoven fabric |
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| Publication Number | Publication Date |
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| CN110637117A CN110637117A (en) | 2019-12-31 |
| CN110637117B true CN110637117B (en) | 2021-10-26 |
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| CN201880033078.XA Active CN110637117B (en) | 2017-06-05 | 2018-05-23 | Non-woven fabric |
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| JP (1) | JP6927299B2 (en) |
| CN (1) | CN110637117B (en) |
| TW (1) | TWI771425B (en) |
| WO (1) | WO2018225512A1 (en) |
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| JP7241279B2 (en) * | 2019-03-15 | 2023-03-17 | 大和紡績株式会社 | Core-sheath type composite fiber, method for producing the same, and fiber assembly containing the same |
| CN110093681B (en) * | 2019-05-08 | 2021-11-23 | 福建省福地化纤科技有限公司 | Antibacterial ES composite short fiber for hot-air non-woven fabric surface layer and preparation method thereof |
| CN110055618A (en) * | 2019-05-08 | 2019-07-26 | 福建省福地化纤科技有限公司 | A kind of hot-wind nonwoven cloth surface layer pro-skin is low to bleed back type ES composite short fiber and preparation method thereof |
| JP7113863B2 (en) * | 2020-03-27 | 2022-08-05 | ユニ・チャーム株式会社 | mask |
| TWI821653B (en) * | 2021-04-15 | 2023-11-11 | 財團法人紡織產業綜合研究所 | Temperature-sensing and humidity-controlling fiber and fabricating method thereof |
| CN113186617A (en) * | 2021-05-12 | 2021-07-30 | 福建省福地化纤科技有限公司 | Anion antibacterial ES composite fiber and preparation method thereof |
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|---|---|
| TW201904536A (en) | 2019-02-01 |
| TWI771425B (en) | 2022-07-21 |
| JP6927299B2 (en) | 2021-08-25 |
| JPWO2018225512A1 (en) | 2020-04-02 |
| WO2018225512A1 (en) | 2018-12-13 |
| CN110637117A (en) | 2019-12-31 |
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