CN109642369B - Laminated nonwoven fabric - Google Patents
Laminated nonwoven fabric Download PDFInfo
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- CN109642369B CN109642369B CN201780053933.9A CN201780053933A CN109642369B CN 109642369 B CN109642369 B CN 109642369B CN 201780053933 A CN201780053933 A CN 201780053933A CN 109642369 B CN109642369 B CN 109642369B
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- nonwoven fabric
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- laminated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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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
- D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/498—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Laminated Bodies (AREA)
- Sanitary Thin Papers (AREA)
Abstract
The invention provides a laminated nonwoven fabric having high elastic recovery rate in elongation and high static friction coefficient in wet state. A laminated nonwoven fabric comprising at least a nonwoven fabric layer A and a nonwoven fabric layer B, the nonwoven fabric layer A and the nonwoven fabric layer B being laminated and integrated, the nonwoven fabric layer A containing fibers obtained by crimping latent crimped filaments, the fibers obtained by crimping the latent crimped filaments being a main constituent material of the nonwoven fabric layer A, the fibers obtained by crimping the latent crimped filaments having a monofilament fiber diameter of 0.2 to 8.0 [ mu ] m, the nonwoven fabric layer B containing short fibers having a monofilament fiber diameter of 10 to 100 [ mu ] m, the content of the short fibers being 80 mass% or more with respect to the nonwoven fabric layer B, the outermost layer of at least one surface of the laminated nonwoven fabric being the nonwoven fabric layer A, the laminated nonwoven fabric having an elastic recovery from elongation in at least either one of the longitudinal direction and the transverse direction of 60% or more, the outermost layer of the laminated nonwoven fabric has a static friction coefficient of 0.80 or more on the surface of the nonwoven fabric layer A. The laminated nonwoven fabric is suitable for skin care products.
Description
Technical Field
The present invention relates to a nonwoven fabric obtained by laminating a plurality of layers.
Background
In recent years, nonwoven fabrics have been increasingly demanded as skin care cosmetics for retaining a liquid chemical on the skin surface for a certain period of time, thereby sufficiently permeating the liquid chemical into the skin to perform whitening, moisturizing, anti-aging, and the like, as applications to exhibit their liquid retention and texture.
In recent years, in order to improve the adhesiveness to the skin and the liquid retention properties, a laminated nonwoven fabric in which a nonwoven fabric formed of nanofibers having a monofilament fiber diameter of 1nm or more and 500nm or less is laminated on a base nonwoven fabric has been proposed (patent document 1).
Further, a nonwoven fabric including fibers obtained by crimping latent crimped filaments (hereinafter, sometimes referred to as crimped fibers) has been proposed (patent document 2). The nonwoven fabric is suitable for use in a mask because the protrusion of the fiber ends from the nonwoven fabric is suppressed, and the tingling sensation to the user is alleviated, thereby providing the user with a good feeling of close contact with the skin.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2007 and 70347
Patent document 2: japanese patent application laid-open No. 2010-116374
Disclosure of Invention
Problems to be solved by the invention
The nonwoven fabric disclosed in patent document 1 includes a nonwoven fabric layer formed of nanofibers, and the entanglement of the nanofibers is strong, so that the elastic recovery rate of elongation of the laminated nonwoven fabric is reduced. Further, this has a problem that the laminated nonwoven fabric has poor followability to a contacted object.
Further, the nonwoven fabric disclosed in patent document 2 includes crimped fibers, and therefore, unevenness is formed on the surface of the nonwoven fabric, and the contact area with the object to be contacted is reduced, and therefore, the static friction coefficient between the nonwoven fabric and the skin is low, and there is a problem that: it has poor wiping properties, and gives users a poor feeling of tightness and close contact when used as a skin care cosmetic.
Accordingly, an object of the present invention is to provide a laminated nonwoven fabric having high strength in wet condition, high elastic recovery from elongation in wet condition, and high static friction coefficient in wet condition.
Means for solving the problems
To solve the above problems, the present invention has the following configuration. That is to say that the first and second electrodes,
(1) a laminated nonwoven fabric having at least a nonwoven fabric A layer and a nonwoven fabric B layer,
the non-woven fabric A layer and the non-woven fabric B layer are integrated,
the nonwoven fabric layer A contains fibers obtained by crimping latent crimped filaments,
the fibers obtained by crimping the latent crimped yarn are the main constituent material of the layer a of the nonwoven fabric,
the diameter of the monofilament fiber of the fiber obtained by crimping the latent crimped yarn is 0.2 to 8.0 μm,
the non-woven fabric layer B contains short fibers having a monofilament fiber diameter of 10 to 100 μm,
the content of the short fibers is 80% by mass or more relative to the B layer of the nonwoven fabric,
the outermost layer of at least one surface of the laminated nonwoven fabric is the nonwoven fabric layer A,
the laminated nonwoven fabric has an elastic recovery rate of elongation of 60% or more in at least either of the machine direction and the transverse direction,
the outermost layer of the laminated nonwoven fabric has a static friction coefficient of 0.80 or more on the surface of the nonwoven fabric layer A.
Preferred embodiments of the present invention include the following configurations.
(2) The laminated nonwoven fabric is characterized in that the monofilament diameter of the staple fibers is 15 to 100 μm.
(3) The laminated nonwoven fabric, wherein the weight per unit area of the A layer of the nonwoven fabric is 5 to 50g/m2，
The weight per unit area of the non-woven fabric B layer is 15-50 g/m2。
(4) The laminated nonwoven fabric according to any one of the above items, wherein the fibers obtained by crimping the latent crimped yarn are composite fibers comprising two thermoplastic resins,
both of the above thermoplastic resins are polyesters.
(5) The laminated nonwoven fabric according to any one of the above aspects, wherein the fibers obtained by crimping the latent crimped yarn are bimetallic composite fibers.
(6) A laminated nonwoven fabric as described in any one of the above, for use in cosmetics.
Preferred applications of the present invention include the following.
(7) A skin care product comprising the laminated nonwoven fabric described in any of the above.
A preferred method for producing the laminated nonwoven fabric of the present invention is as follows.
(8) A method for producing a laminated nonwoven fabric according to any one of (1) to (5), the method comprising the following steps in this order:
the unit area weight is 20 to 30g/m2The weight of the non-woven fabric layer A and the unit area is 20-40 g/m2A step of laminating and integrating the following nonwoven fabric layers B;
a step of subjecting the nonwoven fabric layer A to a chemical treatment; and
and a step of heat-treating the nonwoven fabric layer A.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a laminated nonwoven fabric having high strength in a wet state, high recovery from elongation in a wet state, and a high static friction coefficient in a wet state can be obtained.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. The laminated nonwoven fabric of the present invention has at least a nonwoven fabric layer A and a nonwoven fabric layer B.
As described above, the nonwoven fabric a layer contains, as a main constituent material of the nonwoven fabric a layer, fibers obtained by crimping latent crimped filaments (hereinafter, sometimes simply referred to as crimped fibers). Here, the crimped fiber is a main constituent material of the nonwoven fabric a layer, and specifically means that the crimped fiber is contained in the nonwoven fabric a layer in an amount of more than 50 mass% relative to the entire nonwoven fabric a layer in order to obtain both high elastic recovery from elongation and high static friction coefficient when the laminated nonwoven fabric is wet.
In addition, it is preferable that the layer a of the nonwoven fabric contains 80 mass% or more of crimped fibers with respect to the entire layer a of the nonwoven fabric, and it is particularly preferable that the layer a of the nonwoven fabric contains 100 mass% of crimped fibers with respect to the entire layer a of the nonwoven fabric. In short, it is particularly preferable that the nonwoven fabric a layer contains only crimped fibers, and even in this case, the nonwoven fabric a layer may contain fibers other than crimped fibers, and the like, within a range in which the effects of the present invention are not impaired.
The crimped fiber is obtained by subjecting a latent crimped yarn, which is a composite fiber of two thermoplastic resins, such as a bimetallic type and a partial core sheath type, to a latent crimp development treatment such as a heat treatment. Here, as the bimetal type composite fiber, a side-by-side type composite fiber in which two kinds of thermoplastic resins are present adjacently in a direction substantially parallel to the longitudinal direction of the fiber can be exemplified. The crimped fiber is a fiber having a crimp obtained by utilizing a difference in thermal shrinkage and stress between two thermoplastic resins, and is different from a fiber having a crimp merely imparted by a machine such as a stuffing box type crimper.
The crimped fiber has a filament diameter of 0.2 to 8.0 μm.
The nonwoven fabric a layer can impart the following effects to the laminated nonwoven fabric of the present invention: the outermost layer of the laminated nonwoven fabric is a surface of the laminated nonwoven fabric of the nonwoven fabric layer a (hereinafter, may be referred to as a laminated nonwoven fabric surface a.) and has an increased static friction coefficient when the skin is wet; and an increase in the elastic recovery from elongation when wet. Further, when the laminated nonwoven fabric of the present invention having the above-described characteristics is used as a cosmetic laminated nonwoven fabric such as a face mask and the cosmetic laminated nonwoven fabric is used in such a manner that the nonwoven fabric a layer is disposed on the skin side of the user, the user can actually feel an excellent tightening effect and a water retention effect.
Here, in order to suppress the occurrence of yarn breakage in the crimped fiber in the spinning step and to improve the elastic recovery from elongation when the laminated nonwoven fabric is wet by sufficiently developing three-dimensional crimp in the crimped fiber, the lower limit value of the monofilament diameter of the crimped fiber must be 0.2 μm or more, preferably 1.0 μm or more, and particularly preferably 3.5 μm or more. On the other hand, in order to increase the static friction coefficient between the surface of the nonwoven fabric a layer and the skin when wet, that is, in order to increase the static friction coefficient between the laminated nonwoven fabric a and the skin when wet, the upper limit of the monofilament diameter of the crimped fiber must be 8.0 μm or less, preferably 6.0 μm or less.
In addition, the weight per unit area of the non-woven fabric A layer is preferably 5 to 50g/m2. By setting the weight per unit area of the nonwoven fabric layer A to 5g/m2As described above, the laminated nonwoven fabric having the nonwoven fabric a layer has excellent elastic recovery from elongation when wet, and when the laminated nonwoven fabric is used as a mask, the effect of bonding the mask to the skin of the user can be made excellent. On the other hand, the basis weight of the nonwoven fabric layer A was set to 50g/m2Hereinafter, when the laminated nonwoven fabric having the nonwoven fabric a layer is used as a face mask, the user of the face mask can actually feel an excellent tightening effect. From the above viewpoint, the lower limit of the weight per unit area of the nonwoven fabric A layer is more preferably 8g/m2Above, 20g/m is particularly preferable2The above. In addition, from the viewpoint of weight reduction of the laminated nonwoven fabric, the upper limit of the weight per unit area of the nonwoven fabric a layer is more preferably 40g/m2Hereinafter, more preferably 30g/m2The following.
The crimped fiber is not particularly limited, and a composite fiber having two thermoplastic resins is preferred from the viewpoint of the necessity of developing a finer crimp. Preferably, both of the thermoplastic resins are polyester. The form of the composite fiber may be a bimetallic form, an eccentric sheath form, or the like, and among them, a bimetallic form is preferable because of its excellent productivity.
The length of the crimped fiber is preferably 30mm to 80mm in number average from the reason that the passing property in the carding step is good when producing the nonwoven fabric a layer.
Examples of the thermoplastic resin used for the crimped fiber include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyamide, and thermoplastic polyurethane. The thermoplastic resin may contain various additives such as inorganic particles such as titanium oxide and silica, colorants such as carbon black and pigments, antioxidants, and ultraviolet absorbers.
In particular, the thermoplastic resin used for the crimped fiber is preferably a polyester such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, or the like, from the viewpoint of excellent chemical resistance, durability, or the like.
The cross-sectional shape of the crimped fiber may be appropriately selected depending on the application of the laminated nonwoven fabric, and specifically, may be selected from various cross-sectional shapes such as a perfect circle cross-section, a flat cross-section, a polygonal cross-section such as a triangle and a hexagon, a Y-shaped cross-section, and a star-shaped cross-section.
As a method for producing crimped fibers, the following method is preferable. First, an island-in-sea structure fiber in which island components are dispersed in sea components in a cross-sectional view perpendicular to the fiber axis is prepared. At this time, the island component is brought into a state where two or more different thermoplastic resins are bonded. Sea component is a substance dissolved in a liquid. The sea component in the fiber is dissolved with an alkaline solution or the like to leave the island component, thereby forming a bimetal.
The nonwoven fabric A layer of the laminated nonwoven fabric of the present invention contains only crimped fibers, and the crimped fibers have a monofilament fiber diameter of 3.5 to 6.0 μm and a basis weight of 20g/m2Above and 30g/m2The following is a particularly preferred embodiment. By allowing the nonwoven fabric layer a to satisfy the above conditions, the effects of high wet strength, high wet elastic recovery, and high wet static friction coefficient can be obtained.
The nonwoven fabric layer B contains short fibers having a monofilament fiber diameter of 10 to 100 μm. The content of the short fibers in the nonwoven fabric layer B is 80 mass% or more with respect to the nonwoven fabric layer B. The laminated nonwoven fabric having the nonwoven fabric layer B has high strength when wet.
The lower limit of the filament diameter of the staple fibers is 10 μm or more, and particularly preferably 15 μm or more, from the viewpoint of the high strength of the laminated nonwoven fabric having the nonwoven fabric layer B when wet. On the other hand, the upper limit of the monofilament diameter of the staple fibers is 100 μm or less because the laminated nonwoven fabric having the nonwoven fabric B layer is excellent in softness.
As the short fibers, synthetic fibers such as polyester fibers, polyamide fibers, and acrylic fibers, and natural fibers such as cotton and wool are preferably used. In particular, synthetic fibers are more preferably used, and polyester fibers are particularly preferably used, because the strength of the laminated nonwoven fabric having the nonwoven fabric layer B in wet condition can be further improved.
The staple fibers preferably have a fiber length of 10 to 100mm in number average from the viewpoint of maintaining the carding passing property during production and the tensile strength of the nonwoven fabric. More preferably 25mm to 80 mm.
In addition, the weight per unit area of the non-woven fabric B layer is preferably 15 to 50g/m2. The weight per unit area of the B layer of the non-woven fabric is 15g/m2As described above, the laminated nonwoven fabric including the nonwoven fabric B layer can be made excellent in strength. On the other hand, the basis weight of the nonwoven fabric B layer was 50g/m2Hereinafter, the elastic recovery rate of elongation of the laminated nonwoven fabric having the nonwoven fabric B layer is more suitable for the use of the mask pack, and the mask pack using the laminated nonwoven fabric can provide the user with a realistic sensation of excellent tightening effect. From the above viewpoint, the lower limit of the weight per unit area of the nonwoven fabric B layer is more preferably 20g/m2The above.
Further, the weight per unit area of the nonwoven fabric layer B is more preferably 40g/m from the viewpoint of weight reduction of the laminated nonwoven fabric2The following.
In addition, in the laminated nonwoven fabric of the invention, the weight per unit area of the nonwoven fabric layer A is 5 to 50g/m2And the weight per unit area of the non-woven fabric B layer is 15-50 g/m2Is preferred. When the basis weights of the nonwoven fabric a layer and the nonwoven fabric B layer are set to the above ranges, the laminated nonwoven fabric of the present invention can provide a user with excellent close contact feeling and firmness when the laminated nonwoven fabric is used as a face mask. In addition, since the strength is also excellent, the user can be provided with an excellent feeling of use. In addition, for the same reason as described above, in the laminated nonwoven fabric of the present invention, the nonwoven fabric a layer is formed of a single layerThe weight per unit area is 8 to 30g/m2And the weight per unit area of the non-woven fabric B layer is 20-40 g/m2Is more preferred.
The laminated nonwoven fabric of the present invention has the nonwoven fabric a layer and the nonwoven fabric B layer, and the nonwoven fabric a layer and the nonwoven fabric B layer are laminated and integrated, and therefore the laminated nonwoven fabric of the present invention is excellent in strength when wet, elastic recovery from elongation when wet, and static friction coefficient when wet.
Here, a high elongation elastic recovery rate in the wet state and a high static friction coefficient in the wet state can be achieved only for the nonwoven fabric a layer, but the nonwoven fabric a layer shrinks and the stretchability deteriorates through the heat treatment process of the nonwoven fabric a layer (which is used to make the crimped fibers included in the nonwoven fabric a layer three-dimensionally crimped). As a result, it is not suitable for use in a mask or the like which is used while being stretched and in close contact with the skin. The strength of the nonwoven fabric a layer can be made sufficient for the nonwoven fabric a layer to be treated alone by increasing the basis weight of the nonwoven fabric a layer, but the shrinkage of the nonwoven fabric a layer due to the heat treatment step cannot be suppressed. Further, although high strength can be achieved even in the wet state with only the nonwoven fabric B layer, the elastic recovery rate in extension in the wet state and the static friction coefficient in the wet state are deteriorated, and thus it is not suitable for use in a mask or the like.
The present inventors have found that the laminated nonwoven fabric of the present invention has a structure in which a nonwoven fabric a layer and a nonwoven fabric B layer are laminated and integrated. The laminated nonwoven fabric of the present invention has the nonwoven fabric B layer, and the nonwoven fabric B layer and the nonwoven fabric a layer are laminated and integrated, whereby the effect of suppressing shrinkage of the nonwoven fabric a layer due to heat treatment of the nonwoven fabric a layer can be obtained, and the laminated nonwoven fabric can have sufficient strength for treatment of the laminated nonwoven fabric as a face film or the like. In addition, the laminated nonwoven fabric of the present invention has the nonwoven fabric a layer, and the nonwoven fabric a layer and the nonwoven fabric B layer are laminated and integrated, whereby the following effects can be obtained in addition to the above effects: the static friction coefficient of the laminated non-woven fabric A and the skin is improved when the laminated non-woven fabric A and the skin are wet; and an increase in the elastic recovery rate of the laminated nonwoven fabric when wet. In the case where the laminated nonwoven fabric of the present invention is used as a cosmetic laminated nonwoven fabric such as a facial mask and the cosmetic laminated nonwoven fabric is used in such a manner that the a layer of the nonwoven fabric is in contact with the skin of the user, the user can feel an excellent tightening effect and a water retention effect.
The laminated nonwoven fabric of the present invention is not particularly limited as long as the outermost layer of at least one surface of the laminated nonwoven fabric is a nonwoven fabric a layer. Specifically, a structure having the following order from one outermost surface of the laminated nonwoven fabric can be exemplified.
(I) Non-woven fabric layer A/non-woven fabric layer B,
(II) non-woven fabric layer A/non-woven fabric layer B/non-woven fabric layer A,
(III) nonwoven fabric layer A/nonwoven fabric layer B/nonwoven fabric layer A,
(IV) nonwoven fabric layer A/nonwoven fabric layer B/nonwoven fabric layer A, etc.
The laminated nonwoven fabric of the present invention may have layers other than the nonwoven fabric a layer and the nonwoven fabric B layer, as long as the effects of the present invention are not impaired. Examples of the layer other than the nonwoven fabric a layer and the nonwoven fabric B layer include layers such as nonwoven fabrics, woven fabrics, knitted fabrics, and films, and examples of such laminated nonwoven fabrics include layers of nonwoven fabric a layer/nonwoven fabric B layer/woven fabric.
Further, a protective layer such as a film may be further added to the outermost surface of the laminated nonwoven fabric of the present invention. In addition, in the case where such a laminated nonwoven fabric provided with a protective layer (for example, protective layer/nonwoven fabric a layer/nonwoven fabric B layer, etc.) is used as a cosmetic product laminated nonwoven fabric such as a face mask, and the protective layer or the like can be peeled off from the laminated nonwoven fabric before use, it is needless to say that the effects obtained by the laminated nonwoven fabric of the present invention described above are not hindered at all.
The laminated nonwoven fabric of the present invention has an elastic recovery rate of elongation of 60% or more in at least one of the longitudinal direction of the laminated nonwoven fabric and the transverse direction of the laminated nonwoven fabric. The laminated nonwoven fabric of the present invention is used as a cosmetic laminated nonwoven fabric such as a face mask, and the laminated nonwoven fabric is used so that the direction in which the elastic recovery rate of elongation of the laminated nonwoven fabric is 60% or more is substantially orthogonal to the longitudinal direction of the nose of the user, whereby the tracking ability and the feeling of tightness of the cosmetic laminated nonwoven fabric can be improved. Preferably, the elastic recovery rate of elongation of at least one of the longitudinal direction of the laminated nonwoven fabric and the transverse direction of the laminated nonwoven fabric is 65% or more. Here, the longitudinal direction of the laminated nonwoven fabric means a traveling direction in the manufacturing process of the laminated nonwoven fabric, and the transverse direction of the laminated nonwoven fabric means a direction perpendicular to the longitudinal direction. The upper limit of the elastic recovery from elongation of at least one of the longitudinal direction of the laminated nonwoven fabric and the transverse direction of the laminated nonwoven fabric is not particularly limited, but is preferably 90% or less for the reason of a decrease in the close contact feeling during use.
The static friction coefficient of the nonwoven fabric a layer constituting the outermost surface of the laminated nonwoven fabric of the present invention, i.e., the laminated nonwoven fabric surface a, is 0.80 or more. By setting the static friction coefficient of the laminated nonwoven fabric surface a to 0.80 or more, the laminated nonwoven fabric has excellent wiping properties at the outermost surface where the nonwoven fabric layer a is arranged. When the laminated nonwoven fabric of the present invention is used as a cosmetic laminated nonwoven fabric such as a face mask, and the cosmetic laminated nonwoven fabric is used so that the nonwoven fabric layer a is in contact with the skin of the user, an excellent close contact feeling can be imparted to the user. From the above points, the static friction coefficient of the laminated nonwoven fabric surface a is preferably 1.00 or more, and more preferably 1.40 or more. The upper limit of the static friction coefficient of the laminated nonwoven fabric surface a is not particularly limited, but is preferably 2.00 or less from the viewpoint of suppressing irritation to the skin.
The breaking strength of the laminated nonwoven fabric is preferably 10N/50mm or more, and more preferably 15N/50mm or more, as an average value of the longitudinal direction and the transverse direction of the laminated nonwoven fabric, in order to prevent breakage when the laminated nonwoven fabric is used. The upper limit of the breaking strength of the laminated nonwoven fabric is not particularly limited, but is preferably 200N/50mm or less for the reason of obtaining flexibility of the nonwoven fabric.
The water retention of the laminated nonwoven fabric is preferably 8 times by mass or more of the whole laminated nonwoven fabric, and more preferably 10 times by mass or more of the whole laminated nonwoven fabric. The upper limit of the water retention of the laminated nonwoven fabric is not particularly limited, but is preferably 20 times by mass or less. This is because, when a mask sheet using the laminated nonwoven fabric is used, dripping of a liquid from the mask sheet can be suppressed, peeling of the mask sheet from the face of a user due to its own weight can be suppressed, and the mask sheet is excellent in handling properties.
The total weight per unit area of the laminated nonwoven fabric is preferably 20 to 100g/m2. The lower limit is more preferably 20g/m2Above, more preferably 30g/m2The above. On the other hand, the upper limit is more preferably 100g/m2Hereinafter, more preferably 70g/m2The following. By setting the weight per unit area to 20g/m2As described above, the stretch deformation of the nonwoven fabric during use can be suppressed. On the other hand, the weight per unit area is set to 100g/m2The adhesion can be suppressed from decreasing.
The layer a and layer B of the laminated nonwoven fabric of the present invention are preferably spunlace nonwoven fabrics. The spunlace nonwoven fabric is obtained by the following method: the constituent fibers are complexed by a high pressure stream of water. In addition, in the method of entangling constituent fibers with a high-pressure water stream, the amount of broken filaments of the constituent fibers at the time of entangling is small as compared with the method of entangling constituent fibers by needle punching, and as a result, a nonwoven fabric layer having high strength can be obtained.
The layer a and the layer B may be individually complexed by a high-pressure water flow, and then the layer a and the layer B may be laminated and integrated by a high-pressure water flow to form a laminated nonwoven fabric. The non-entangled web subjected to the carding step for forming the layer a and the non-entangled web subjected to the carding step for forming the layer B may be laminated, and fibers may be entangled with each other by a high-pressure water flow, thereby forming a laminated nonwoven fabric in which the layer a and the layer B are integrated. In the present invention, the term "integrated" means a state in which a layer is joined to another layer.
In addition, a known method can be used for the production method of the laminated nonwoven fabric of the present invention. Preferably, the method comprises the following steps in sequence: make the non-woven fabricA step of laminating the layer A and the layer B of the nonwoven fabric; a step of subjecting the nonwoven fabric layer A to a chemical treatment; and a step of heat-treating the nonwoven fabric layer A. In this case, the weight per unit area of the nonwoven fabric A layer is preferably 20 to 30g/m2And the weight per unit area of the non-woven fabric B layer is 20-40 g/m2The following.
In addition, the laminated nonwoven fabric obtained in the above manner may be subjected to a heat treatment in order to remove moisture. The preferable heat treatment temperature is 100 to 130 ℃.
In addition, when the sea-island structure fiber is used for the nonwoven fabric layer a, the following chemical treatment is required: the obtained laminated nonwoven fabric was treated with a chemical solution to elute the sea component. When the sea component is an alkali soluble resin, the alkali soluble resin may be dissolved out with a sodium hydroxide solution or the like at 90 ℃ to 110 ℃. As a result, the island component remains, forming a latent crimped filament.
In addition, the layer a of the nonwoven fabric is heat-treated in order to crimp the latent crimped filaments contained in the layer a of the nonwoven fabric. As a step of heat-treating the nonwoven fabric a layer, specifically, the following steps can be exemplified.
And treating the laminated nonwoven fabric with pressurized water at 120 to 130 ℃ for 10 to 30 minutes using a beam-type dyeing machine.
And a step of heat-treating the laminated nonwoven fabric at 110 to 150 ℃ for 5 to 20 minutes using a setting machine.
In the latter step using a setting machine, it is preferable that the width of the laminated nonwoven fabric is expanded by 1 to 10% or less before and after setting when setting the laminated nonwoven fabric. Here, the width of the laminated nonwoven fabric means the width of the nonwoven fabric in the direction perpendicular to the running direction when the laminated nonwoven fabric is produced.
The laminated nonwoven fabric of the present invention can be used for cosmetic materials, wiping materials, medical applications, sanitary materials, miscellaneous goods, and the like. The laminated nonwoven fabric is preferably used by being impregnated with a chemical solution, water or the like, and is particularly preferably used for a cosmetic material, which is a skin care product such as a mask or the like impregnated with a cosmetic solution or a cosmetic liquid.
Examples
First, the measurement method used in the present example will be described later.
(1) Diameter of monofilament fiber
The laminated nonwoven fabric is cut perpendicularly to the surface thereof, and a thin cut piece is cut out from the laminated nonwoven fabric. A platinum-palladium alloy was vacuum evaporated onto the cross section of the thin section. Next, the cross-sectional portion of the nonwoven fabric a layer or the nonwoven fabric B layer included in the thin section was observed with a Scanning Electron Microscope (SEM) (model S-3500N manufactured by hitachi high-tech company), 10 positions were randomly selected from the observation range, and a cross-sectional photograph was taken at a magnification of 1,000 times to measure the monofilament diameter. When the fibers have a deformed cross-sectional shape, the cross-sectional area of the fibers is measured from the photograph of the cross-section, and the cross-sectional area is converted into a perfect circle diameter, thereby defining the monofilament fiber diameter of the fibers in the nonwoven fabric a layer or the nonwoven fabric B layer.
(2) Length of fiber
Using JIS L1015: 20108.4.1 measured by the direct method (method C).
(3) Elastic recovery rate of elongation of laminated nonwoven fabric
A test piece (a laminated nonwoven fabric having a nonwoven fabric a layer and a nonwoven fabric B layer) having a width of 25mm and a length of 250mm was cut out from the laminated nonwoven fabric so that the longitudinal direction of the test piece became the traveling direction in the production of the nonwoven fabric a layer included in the laminated nonwoven fabric of the present invention. In addition, the cutting is separately performed so as to be perpendicular to the traveling direction. For each direction, 5 test pieces were prepared. Then, these test pieces were immersed in 3L of 20 ℃ distilled water for 10 minutes or longer, taken out of the distilled water, and then rapidly mounted on a constant-speed elongation tensile tester to measure the elastic recovery from elongation.
The test piece was held at a distance of 100mm in the longitudinal direction. Then, the nip interval was changed from 100mm to 120mm at a speed of 200 mm/min. Then, immediately after the nip interval became 120mm, the nip interval was returned from 120mm to 100mm at a speed of 200 mm/min. Finally, immediately after the clamping interval became 100mm, the clamping interval was changed from 100mm to 130mm at a speed of 200mm/min, and stopped at the clamping interval of 130 mm.
In the final elongation operation, the residual elongation at 20% elongation of the test piece was read from the stress-strain curve. From the average value of the residual elongations of the obtained test pieces (5 pieces each), the longitudinal elongation elastic recovery and the transverse elongation elastic recovery were calculated by the following formulas. Of the obtained elongation elastic recoveries, the higher value of the longitudinal elongation elastic recovery and the transverse elongation elastic recovery was defined as the elongation elastic recovery of the laminated nonwoven fabric in a wet state.
E＝(20mm-L)/20mm×100
Here, E: elastic recovery from elongation (%)
L: residual elongation (mm).
(4) Weight per unit area of laminated nonwoven fabric
Based on JIS L1913: 19986.2 were measured. 3 test pieces of 300mm × 300mm were collected from a sample of the laminated nonwoven fabric using a steel scale and a razor blade. Subsequently, the test piece was placed in a chamber adjusted to 20 ℃ x 65% RH for 12 hours, and then the mass of the test piece was measured. The mass per unit area was obtained according to the following formula, and the average weight per unit area of 3 test pieces was calculated.
ms＝m/S
Here, ms: weight per unit area (mass per unit area (g/m) of laminated nonwoven fabric2))
m: average Mass (g) of test pieces
S: area (m) of test piece2)。
(5) Basis weight of non-woven fabric A layer before lamination
Based on JIS L1913: 19986.2 were measured. 3 test pieces of 300mm × 300mm were collected from the nonwoven fabric layer a before lamination using a steel scale and a razor blade. Subsequently, the test piece was placed in a chamber adjusted to 20 ℃ x 65% RH for 12 hours, and then the mass of the test piece was measured. The mass per unit area was obtained according to the following formula, and the average weight per unit area of 3 test pieces was calculated.
msa＝m/S
Here, msa: weight per unit area (mass per unit area (g/m) of the nonwoven fabric A layer before lamination2))
m: average Mass (g) of test pieces
S: area (m) of test piece2)。
(6) Basis weight of non-woven fabric (B) layer before lamination
Based on JIS L1913: 19986.2 were measured. 3 test pieces of 300mm × 300mm were collected from the nonwoven fabric layer B sample before lamination using a steel scale and a razor blade. Subsequently, the test piece was placed in a chamber adjusted to 20 ℃ x 65% RH for 12 hours, and then the mass of the test piece was measured. The mass per unit area was obtained according to the following formula, and the average weight per unit area of 3 test pieces was calculated.
msb＝m/S
Here, msb: weight per unit area (mass per unit area (g/m) of nonwoven fabric layer B before lamination2))
m: average Mass (g) of test pieces
S: area (m) of test piece2)。
(7) Static coefficient of friction of laminated nonwoven fabric
According to JIS P8147: 19943.2 the tilt method. 10 test pieces (laminated nonwoven fabric having a nonwoven fabric A layer and a nonwoven fabric B layer) having a width of 30mm and a length of 130mm were prepared. Next, 5 out of the 10 test pieces were evaluated for the static friction coefficient in the longitudinal direction of the laminated nonwoven fabric (the traveling direction in the manufacturing process of the laminated nonwoven fabric), and 5 out of the 10 test pieces were evaluated for the static friction coefficient in the transverse direction of the laminated nonwoven fabric (the direction perpendicular to the traveling direction).
Specifically, 1 test piece for evaluation was immersed in 3L of distilled water at 20 ℃ for 10 minutes or more, taken out of the distilled water, and then quickly attached to a weight of a slide inclination angle measuring device. On the other hand, a silicon pseudo skin (P001-001 # BK manufactured by Beaulax) was set in a sliding inclination angle measuring device, a weight (mass: 872g) with a test piece set thereon was placed on the pseudo skin so that the measurement surface of the test piece was in contact with the silicon pseudo skin and the longitudinal direction or the lateral direction of the test piece was aligned with the sliding direction of the sliding inclination angle measuring device, the inclination angle at which the weight fell was read under the condition that the inclination angle was less than 3 DEG/sec, and the tangent (tan theta) of the inclination angle was used as the static friction coefficient. The average of the longitudinal static friction coefficients of the 5 test pieces thus obtained was defined as the longitudinal static friction coefficient of the laminated nonwoven fabric. The average of the static friction coefficients in the transverse direction of the other 5 test pieces was defined as the static friction coefficient in the transverse direction of the laminated nonwoven fabric.
(8) Water retention of laminated nonwoven fabric
According to JIS L1913: 20106.9.2 were measured. 5 100mm square test pieces (laminated nonwoven fabric having a nonwoven fabric a layer and a nonwoven fabric B layer) were prepared, and their mass was measured. Subsequently, 3L of distilled water was added to a container having an appropriate size, the test piece was immersed in distilled water at 20 ℃ for 10 minutes or more, the test piece was taken out from the distilled water with tweezers, one end of the test piece was lifted with a jig, and water was dropped for 1 minute, and then the mass of the test piece was measured as the water retention amount. From the average water retention of each of the 5 test pieces obtained, the water retention rate was calculated by using the following formula.
m＝(m2-m1)/m1
m: water retention rate (quality times)
m1: quality (g) of test piece in Standard State
m2: mass (g) after wetting and dropping the test piece into water.
(9) Breaking strength of laminated nonwoven fabric
According to JIS L1913: 19986.3.2 were measured. 10 test pieces (laminated nonwoven fabric having a nonwoven fabric A layer and a nonwoven fabric B layer) having a width of 50mm and a length of 250mm were prepared. Here, the longitudinal direction of 5 test pieces out of the 10 test pieces is the machine direction (longitudinal direction) in the production process of the laminated nonwoven fabric of the present invention, and the longitudinal direction of the remaining 5 test pieces out of the 10 test pieces is the direction (lateral direction) perpendicular to the machine direction in the production process of the laminated nonwoven fabric of the present invention. Then, each test piece was immersed in 3L of distilled water at 20 ℃ for 10 minutes or more, and after the test piece was taken out from the distilled water, the test piece was quickly mounted on a constant-speed elongation tensile tester to measure the breaking stress. The test piece was cut with a load applied at a tensile rate of 200mm/min with a nip interval of 100mm in the longitudinal direction, and the maximum stress at the time of breaking the test piece was read from the stress-strain curve, and the average of the obtained 5 measured values in both the longitudinal direction and the transverse direction of the laminated nonwoven fabric was taken as the breaking strength in the longitudinal direction or the transverse direction of the laminated nonwoven fabric.
(10) Fineness of fiber
The weight of the fiber per unit length was measured in an atmosphere at a temperature of 20 ℃ and a humidity of 65% RH, and the weight equivalent to 10000m of the fiber was calculated from the measured value. The measurement was repeated 10 times, and the decimal point of the arithmetic average value was rounded up and the obtained value was taken as the fineness (dtex).
(11) Evaluation of Performance
The laminated nonwoven fabrics obtained in the examples and comparative examples were impregnated with 50ml of a cosmetic liquid (non-print good product, "cosmetic liquid/sensitive skin moisturizing type"), the products obtained thereby were attached to the skin, and the overall evaluation on the firmness, the following property of the skin surface, the adhesiveness, and the handling property was evaluated by 10 female evaluation panelists in each absolute evaluation (full score of 10), and the evaluation was made according to the following criteria based on the average score of 10 (rounded to the decimal point).
Very excellent: 9 to 10 minutes
Excellent: 7 to 8 minutes
Slightly superior: 5 to 6 minutes
Slightly poor: 3 to 4 minutes
Difference: 0 to 2 minutes.
(example 1)
(superfine three-dimensional crimped yarn)
Polyethylene terephthalate (PET1 melt viscosity: 140 pas) was prepared as the island component 1, polypropylene terephthalate (3GT melt viscosity: 130 pas) was prepared as the island component 2, and polyethylene terephthalate (copolymerized PET) copolymerized with 8.0 mol% of sodium 5-sulfoisophthalate and 10 mass% of polyethylene glycol (molecular weight 1000) was prepared as the sea component. They were melted at 280 ℃ and measured out to flow into a spinning pack equipped with a composite spinneret. A sea-island composite fiber having an island component having a bimetallic composite form obtained by bonding island component 1 and island component 2 and a sea component of copolymerized PET was obtained. In this sea-island composite fiber, 250 islands of island components having a composite form of a bimetallic composite fiber were formed in 1 sea-island composite fiber.
The composite ratio of island component 1/island component 2/sea component was adjusted to 40/40/20 by weight. The melt-discharged sliver was cooled and solidified, and then an oiling agent was added thereto, and the resultant was wound at a spinning speed of 1500m/min to obtain an undrawn yarn. Further, the undrawn yarn was passed from a pair of rolls at 80 ℃ to a pair of rolls at 130 ℃ and was drawn at a final drawing speed of 800m/min by 3.2 times to obtain a sea-island composite fiber (70 dtex-12 filament).
The sea-island fibers thus obtained were bundled to 40 ten thousand dtex. The finish oil at the time of spinning was removed therefrom, and a new finish oil was applied thereto, and then mechanical crimping was performed using an extrusion crimper to obtain a tow. Then, the obtained tow was wound around a roller having blades provided outward at an interval of 51mm, and subjected to a cutting process by a press-cutting, to obtain a cut fiber having a single-fiber fineness of 5.8dtex and a length of 51 mm.
(nonwoven A layer)
And (3) cutting the superfine fibers into fibers by using a carding machine, and then forming a net by using a cross lapping machine. Combining the network by high pressure water flow under the conditions of pressure of 3MPa and speed of 1.0m/min to obtain 35g/m2The nonwoven fabric layer A of (1).
(nonwoven B layer)
A polyethylene terephthalate cut fiber (variety: T471,monofilament 1.6dtex, cut length 51mm) and then formed into a web with a cross-lapper. Under the conditions of pressure of 3MPa and speed of 1.0m/min, the high-pressure water flow is utilized to combine the networks to obtain 50g/m2Layer B of the nonwoven fabric of (1).
(laminated nonwoven Fabric)
The nonwoven fabric layer a and the nonwoven fabric layer B obtained above were laminated, and further subjected to complexing and integration by a high-pressure water flow under a pressure of 10MPa and a speed of 1.0m/min, to obtain a laminated nonwoven fabric. Next, the laminated nonwoven fabric was dried at 110 ℃, and then treated with a 1% sodium hydroxide aqueous solution at a temperature of 95 ℃, a bath ratio of 1: 40, and a treatment time of 40 minutes using a beam dyeing machine to remove the sea component of the microfiber cut fiber contained in the layer a of the nonwoven fabric, and then the laminated nonwoven fabric was expanded by 3% using a setting machine, and subjected to a heat treatment at 130 ℃ for 5 minutes to impart crimp to the latent crimped filaments contained in the layer a of the nonwoven fabric. The weight per unit area of the obtained laminated nonwoven fabric was 78g/m2。
The resulting laminated nonwoven fabric had an elastic recovery rate of elongation of 84.1%, a static friction coefficient of the laminated nonwoven fabric A of 1.51, a water retention rate of 13.2 times by mass, and a breaking strength of 80N, and the monofilament diameter of the crimped fibers contained in the layer A of the nonwoven fabric was 4.9 μm, and the monofilament diameter of the short fibers contained in the layer B of the nonwoven fabric was 17.4 μm.
Next, the performance of the obtained laminated nonwoven fabric was evaluated to be 9 points, and the results were very good.
Comparative example 1
(Polymer alloy fiber)
Melt viscosity of 212 pas (262 ℃ C., shear rate of 121.6 sec) was measured out-1) Nylon 6(N6) (40 mass%) having a melting point of 220 ℃ and a weight-average molecular weight of 12 ten thousand and a melt viscosity of 30 pas (240 ℃ C., shear rate of 2432sec-1) And poly L-lactic acid (60 mass%) having a melting point of 170 ℃ and an optical purity of 99.5% or more, were supplied to a twin-screw extruder described in detail below, and kneaded at 220 ℃ to obtain polymer alloy sheets (polymers)alloy chip)。
Screw shape: same direction complete meshing type 2 threads
Screw rod: diameter 37mm, effective length 1670mm, L/D45.1.
The kneading section length was 28% of the effective screw length.
The kneading section is located at 1/3 on the discharge side of the effective length of the screw.
The middle part of the tube is provided with 3 backflow parts.
And (4) air vents: at 2.
The obtained polymer alloy sheet was supplied to a single-screw extrusion-type melting device of a spinning machine for chopped fiber (staple), and melt-spun at a melting temperature of 235 ℃, a spinning temperature of 235 ℃ (spinneret surface temperature of 220 ℃), and a spinning speed of 1200m/min, to obtain a polymer alloy fiber. The filaments were combined and then subjected to steam drawing to obtain a tow made of a polymer alloy fiber having a single fiber fineness of 3.0 dtex. The strength of the obtained polymer alloy fiber was 3.5cN/dtex, the elongation was 45%, and the U% ═ 1.0%, and the excellent properties were exhibited.
(crimping/cutting step)
The tow made of the polymer alloy fiber was mechanically crimped (12 pieces (mountain in japanese)/25 mm) and then cut into 51mm short fibers.
(nonwoven A layer)
After the short fibers are opened by a carding machine, a cross lapping machine is used for forming a net. Under the conditions of pressure of 3MPa and speed of 1.0m/min, the high-pressure water flow is utilized to combine the networks to obtain 62g/m2The nonwoven fabric of (1).
(nonwoven B layer)
A cut polyethylene terephthalate fiber (variety: T471, monofilament 1.6dtex, cut length 51mm) manufactured by Toray corporation was opened by a carding machine, and then a web was formed by a cross-lapping machine. Under the conditions of pressure of 3MPa and speed of 1.0m/min, the high-pressure water flow is utilized to combine the networks to obtain 50g/m2Layer B of the nonwoven fabric of (1).
(laminated nonwoven Fabric)
The nonwoven fabric A obtained above was usedThe layer and the non-woven fabric layer B are laminated, and then the layers are integrated by complexing with high-pressure water flow under the conditions of pressure of 10MPa and speed of 1.0m/min, so that the laminated non-woven fabric is obtained. Subsequently, the laminated nonwoven fabric was dried at 110 ℃. Next, the laminated nonwoven fabric was treated with a 1% sodium hydroxide aqueous solution under conditions of a temperature of 95 ℃, a bath ratio (laminated nonwoven fabric/sodium hydroxide aqueous solution) of 1/40 (mass ratio) and a treatment time of 40 minutes using a beam dyeing machine to thereby remove the sea component (poly L-lactic acid component) in the polymer alloy fibers contained in the nonwoven fabric layer a, and then the laminated nonwoven fabric obtained was subjected to heat treatment at 130 ℃ for 5 minutes while being expanded by a setting machine to 3% to thereby develop crimp in the latent crimped filaments contained in the nonwoven fabric layer a. The weight per unit area of the obtained laminated nonwoven fabric was 75g/m2。
The resulting laminated nonwoven fabric had an elastic recovery rate of elongation of 51.9%, a static friction coefficient of the laminated nonwoven fabric surface a of 1.70, a water retention rate of 5.6 times by mass, and a breaking strength of 130N, and the monofilament diameter of the polymer alloy fiber contained in the layer a of the nonwoven fabric was 0.15 μm, and the monofilament diameter of the short fiber contained in the layer B of the nonwoven fabric was 17.4 μm.
Next, the performance of the obtained laminated nonwoven fabric was evaluated, and the resulting nonwoven fabric was slightly inferior in the tight feeling and the skin-following property, which were 4 points.
Comparative example 2
(nonwoven A layer)
A commercially available 2.2dtex, 51mm long bimetallic fiber was opened by a carding machine and then formed into a web by a cross lapping machine. Under the conditions of pressure of 3MPa and speed of 1.0m/min, the high-pressure water flow is utilized to combine the networks to obtain 20g/m2The nonwoven fabric layer A of (1).
(nonwoven B layer)
A cut polyethylene terephthalate fiber (variety: T471, monofilament 1.6dtex, cut length 51mm) manufactured by Toray corporation was opened by a carding machine, and then a web was formed by a cross-lapping machine. Under the conditions of pressure of 3MPa and speed of 1.0m/min, the high-pressure water flow is utilized to combine the networks to obtain 50g/m2Layer B of the nonwoven fabric of (1).
(laminated nonwoven Fabric)
The nonwoven fabric A layer and the nonwoven fabric B layer obtained above were laminated, and further subjected to complexation and integration by a high-pressure water flow under a pressure of 10MPa and a speed of 1.0m/min to obtain a nonwoven fabric having a weight per unit area of 70g/m2The laminated nonwoven fabric of (1).
The resulting laminated nonwoven fabric had an elastic recovery rate of elongation of 82%, a static friction coefficient of the laminated nonwoven fabric surface a of 0.72, a water retention rate of 6.3 times by mass, and a breaking strength of 24N, and the monofilament diameter of the bimetallic fiber contained in the layer a of the nonwoven fabric was 20.4 μm, and the monofilament diameter of the staple fiber contained in the layer B of the nonwoven fabric was 17.4 μm.
Then, the performance of the obtained laminated nonwoven fabric was evaluated, and the skin-following property and handling property were poor, namely, 3 points, and the results were slightly poor.
Comparative example 3
A cut polyethylene terephthalate fiber (variety: T471, monofilament 1.6dtex, cut length 51mm) manufactured by Toray corporation was opened by a carding machine, and then a web was formed by a cross-lapping machine. Combining the network with high pressure water flow under the conditions of pressure of 3MPa and speed of 1.0m/min, complexing with high pressure water flow under the conditions of pressure of 10MPa and speed of 1.0m/min, and drying at 130 deg.C to obtain the product with unit area weight of 70g/m2The nonwoven fabric of (1).
The obtained nonwoven fabric had an elastic recovery from elongation of 37%, a coefficient of static friction on both sides of the nonwoven fabric of 0.45, a water retention of 15.1 times by mass, a breaking strength of 78N, and a filament diameter of the fibers contained in the nonwoven fabric of 17.4. mu.m.
Subsequently, the nonwoven fabric obtained was evaluated for its properties, and the nonwoven fabric was inferior in all of tightness, skin-following property, adhesiveness and handling property, namely, 2 points, and the results were inferior.
(examples 2 to 10)
Laminated nonwoven fabrics of examples 2 to 10 were obtained in the same manner as in example 1, except that each had the configuration shown in table 1.
That is, the laminated nonwoven fabric of example 2 was produced in the same manner as in example 1 except that the same crimped fiber as in example 1 was mixed with a cut polyethylene terephthalate fiber (variety: T471, monofilament 1.6dtex, cut length 51mm) manufactured by toyo corporation in the layer a of the nonwoven fabric, and the content of the crimped fiber was changed to 80 mass%. The resulting laminated nonwoven fabric had an elastic recovery rate for elongation and a static friction coefficient both inferior to those of the laminated nonwoven fabric of example 1. The performance of the laminated nonwoven fabric of example 2 was evaluated as excellent as 7. The laminated nonwoven fabric of example 3 was produced in the same manner as in example 2, except that the content of the crimped fibers in the nonwoven fabric layer a was changed to 55 mass%. The resulting laminated nonwoven fabric had an elastic recovery rate in elongation and a static friction coefficient both lower than those of the laminated nonwoven fabric of example 2. The performance of the laminated nonwoven fabric of example 3 was evaluated to be 6, and was slightly excellent.
The laminated nonwoven fabric of example 10 was used except that the weight per unit area of the nonwoven fabric layer B was set to 24g/m2Except for this, the same procedure as in example 1 was used. The obtained laminated nonwoven fabric had a breaking strength slightly lower than that of the laminated nonwoven fabric of example 1, but there was no problem in using the laminated nonwoven fabric for a face mask.
On the other hand, the obtained laminated nonwoven fabric was lighter in weight and more excellent in handleability than example 1. The performance of the laminated nonwoven fabric of example 7 was evaluated to be 9, which was very excellent. The laminated nonwoven fabric of example 5 was produced in the same manner as in example 10, except that the monofilament diameter of the crimped fibers contained in the a layer of the nonwoven fabric was changed to 2.5 μm. The laminated nonwoven fabric of example 10 was more excellent in the elastic recovery from elongation than the laminated nonwoven fabric of example 5. The performance of the laminated nonwoven fabric of example 5 was evaluated as excellent as 8.
The laminated nonwoven fabric of example 4 was obtained except that the weight per unit area of the nonwoven fabric layer A was changed to 16g/m2The same procedure as in example 5 was repeated except that the composition was used. The layer of example 5 compares the elastic recovery at elongation of the laminated nonwoven fabric of example 4The nonwoven fabric laminate is more excellent in elastic recovery from elongation. The performance of the laminated nonwoven fabric of example 4 was evaluated to be 5, which was slightly superior.
The laminated nonwoven fabric of example 6 was produced in the same manner as in example 4, except that the monofilament diameter of the crimped fibers contained in the layer a of the nonwoven fabric was changed to 3.5 μm. The laminated nonwoven fabric of example 6 is superior in elastic recovery from elongation to elongation as compared to that of the laminated nonwoven fabric of example 4. The performance of the laminated nonwoven fabric of example 6 was evaluated as excellent as 7.
The laminated nonwoven fabric of example 7 was produced in the same manner as in example 5, except that the monofilament diameter of the crimped fibers contained in the layer a of the nonwoven fabric was changed to 3.5 μm. The elastic recovery from elongation of the laminated nonwoven fabric of example 7 was equal to that of the laminated nonwoven fabric of example 5. The performance of the laminated nonwoven fabric of example 7 was evaluated to be 9, which was very excellent.
The laminated nonwoven fabric of example 8 was produced in the same manner as in example 6, except that the monofilament diameter of the crimped fibers contained in the layer a of the nonwoven fabric was changed to 4.9 μm. The elastic recovery rate of elongation of the laminated nonwoven fabric of example 8 was equal to that of the laminated nonwoven fabric of example 6. The performance of the laminated nonwoven fabric of example 8 was evaluated as excellent as 8.
The laminated nonwoven fabric of example 9 was obtained except that the weight per unit area of the nonwoven fabric layer A was changed to 20g/m2The same procedure as in example 8 was repeated except that the composition was used. The laminated nonwoven fabric of example 9 was superior in elastic recovery from elongation to elongation as compared to the laminated nonwoven fabric of example 8. The performance of the laminated nonwoven fabric of example 9 was evaluated to be 9, which was very excellent.
The laminated nonwoven fabric of example 11 was produced in the same manner as in example 10, except that the monofilament diameter of the staple fibers included in the layer B of the nonwoven fabric was changed to 11.5 μm. The carding machine passage was slightly poor because the fineness of the single filaments contained in the B layer was small in diameter. The fracture strength of the laminated nonwoven fabric of example 10 was more excellent than that of the laminated nonwoven fabric of example 11. The performance of the laminated nonwoven fabric of example 11 was evaluated as 6 and was excellent.
Comparative examples 4 to 7
Laminated nonwoven fabrics of comparative examples 4 to 7 were obtained in the same manner as in comparative example 2, except that each had the configuration shown in table 2.
Claims (8)
1. A laminated nonwoven fabric having at least a nonwoven fabric layer A and a nonwoven fabric layer B,
the non-woven fabric layer A and the non-woven fabric layer B are integrated,
the nonwoven fabric layer A contains fibers obtained by crimping latent crimped filaments,
the fibers obtained by crimping the latent crimped yarn are the main constituent material of the A layer of the non-woven fabric,
the diameter of the monofilament fiber of the fiber obtained by crimping the latent crimped yarn is 0.2 to 8.0 μm,
the non-woven fabric layer B contains short fibers with monofilament fiber diameter of 10-100 mu m,
the content of the short fibers is 80 mass% or more with respect to the B layer of the nonwoven fabric,
the outermost layer of at least one surface of the laminated nonwoven fabric is the nonwoven fabric layer A,
the laminated nonwoven fabric has an elastic recovery rate of elongation of 60% or more in at least either of the longitudinal direction and the transverse direction,
the outermost layer of the laminated nonwoven fabric has a static friction coefficient of 0.80 or more with respect to the surface of the nonwoven fabric at the layer A.
2. The laminated nonwoven fabric according to claim 1, wherein the monofilament fiber diameter of the staple fibers of the B layer of the nonwoven fabric is 15 to 100 μm.
3. The laminated nonwoven fabric according to claim 1 or 2, wherein the weight per unit area of the nonwoven fabric layer A is 5 to 50g/m2The weight per unit area of the non-woven fabric B layer is 15-50 g/m2。
4. A laminated nonwoven fabric as claimed in any one of claims 1 to 3, wherein the fibers obtained by crimping the latent crimped yarn are composite fibers comprising two thermoplastic resins,
both of the two thermoplastic resins are polyesters.
5. A laminated nonwoven fabric as claimed in any one of claims 1 to 4, wherein the fibers obtained by crimping the latent crimped filaments are bimetallic composite fibers.
6. A laminated nonwoven fabric as claimed in any one of claims 1 to 5, which is used for cosmetics.
7. A skin care product comprising the laminated nonwoven fabric according to any one of claims 1 to 6.
8. A method for producing the laminated nonwoven fabric according to any one of claims 1 to 6, the method comprising the following steps in this order:
the unit area weight is 20 to 30g/m2The weight of the non-woven fabric layer A and the unit area is 20-40 g/m2A step of laminating and integrating the following nonwoven fabric layers B;
a step of subjecting the nonwoven fabric layer A to a chemical treatment; and
and a step of heat-treating the nonwoven fabric layer A.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016174291 | 2016-09-07 | ||
| JP2016-174291 | 2016-09-07 | ||
| PCT/JP2017/031916 WO2018047810A1 (en) | 2016-09-07 | 2017-09-05 | Laminated nonwoven fabric |
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| CN109642369A CN109642369A (en) | 2019-04-16 |
| CN109642369B true CN109642369B (en) | 2021-08-27 |
| CN109642369B9 CN109642369B9 (en) | 2021-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201780053933.9A Active CN109642369B9 (en) | 2016-09-07 | 2017-09-05 | Laminated nonwoven fabric |
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| JP (1) | JP6866851B2 (en) |
| KR (1) | KR102274710B1 (en) |
| CN (1) | CN109642369B9 (en) |
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|---|---|---|---|---|
| WO2020044911A1 (en) * | 2018-08-27 | 2020-03-05 | 株式会社クラレ | Artificial leather base material, method for production thereof, and napped artificial leather |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6866851B2 (en) | 2021-04-28 |
| KR20190044061A (en) | 2019-04-29 |
| KR102274710B1 (en) | 2021-07-08 |
| JPWO2018047810A1 (en) | 2019-06-24 |
| CN109642369A (en) | 2019-04-16 |
| TWI746630B (en) | 2021-11-21 |
| WO2018047810A1 (en) | 2018-03-15 |
| TW201827210A (en) | 2018-08-01 |
| CN109642369B9 (en) | 2021-10-12 |
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Correction item: Claims Correct: Claims submitted on July 2, 2021 False: error Number: 35-02 Page: ?? Volume: 37 |