WO2016013618A1 - Tissu non tissé pour feuille imprégnée de liquide, feuille imprégnée de liquide, et rayonne viscose pour tissu non tissé pour une feuille imprégnée de liquide - Google Patents

Tissu non tissé pour feuille imprégnée de liquide, feuille imprégnée de liquide, et rayonne viscose pour tissu non tissé pour une feuille imprégnée de liquide Download PDF

Info

Publication number
WO2016013618A1
WO2016013618A1 PCT/JP2015/070978 JP2015070978W WO2016013618A1 WO 2016013618 A1 WO2016013618 A1 WO 2016013618A1 JP 2015070978 W JP2015070978 W JP 2015070978W WO 2016013618 A1 WO2016013618 A1 WO 2016013618A1
Authority
WO
WIPO (PCT)
Prior art keywords
cross
liquid
section
nonwoven fabric
rayon
Prior art date
Application number
PCT/JP2015/070978
Other languages
English (en)
Japanese (ja)
Inventor
陽介 堀口
裕行 鍛治畑
Original Assignee
ダイワボウホールディングス株式会社
ダイワボウレーヨン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ダイワボウホールディングス株式会社, ダイワボウレーヨン株式会社 filed Critical ダイワボウホールディングス株式会社
Priority to CN201580039318.3A priority Critical patent/CN106536803B/zh
Priority to JP2016535971A priority patent/JP6093487B2/ja
Publication of WO2016013618A1 publication Critical patent/WO2016013618A1/fr

Links

Images

Classifications

    • 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
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • 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
    • D04H1/492—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 by fluid jet

Definitions

  • the present invention relates to a nonwoven fabric for a liquid-impregnated sheet suitable for impregnating a liquid, particularly a cosmetic, and a liquid-impregnated sheet and a face mask obtained by impregnating the nonwoven fabric with a liquid.
  • a liquid-impregnated skin-coated sheet impregnated with a liquid containing an active ingredient for example, cosmetics
  • an active ingredient for example, cosmetics
  • a nonwoven fabric mainly comprising hydrophilic fibers such as cotton and rayon
  • a base material made of a nonwoven fabric is generally white and exhibits a color close to white even when impregnated with a liquid (hereinafter also referred to as “wet state” in the present specification).
  • Patent Document 1 proposes that a liquid-retaining sheet is formed using a fiber (transparent fiber) that has a high purity and preferably does not contain a colorant (usually an inorganic pigment (particularly titanium oxide)).
  • Document 1 discloses an example using regenerated cellulose fiber, solvent-spun cellulose fiber, and polyester fiber which do not contain titanium oxide or contain 0.1% by mass or less as transparent fibers.
  • the present invention aims to provide a non-woven fabric used for a liquid-impregnated sheet that gives a higher transparency in a wet state, and a liquid-impregnated sheet using the nonwoven fabric, particularly a face mask to be applied to the face.
  • this invention provides the viscose rayon for nonwoven fabrics used for a liquid impregnation sheet
  • the present invention in one aspect, is a nonwoven fabric used as a base material for a liquid-impregnated sheet used in a state impregnated with a liquid,
  • a non-woven fabric containing viscose rayon having a cross section of a single structure and an unevenness of a cross section obtained by the following formula of 2.0 or less.
  • Concavity and convexity L 2 / (4 ⁇ ⁇ S) (In the formula, L is the circumferential length of the cross section, and S is the area of the cross section.)
  • the present invention provides the nonwoven fabric as a base material, and the liquid is impregnated at a ratio of 100 parts by mass or more and 2500 parts by mass or less with respect to 100 parts by mass of the base material.
  • a liquid impregnated sheet is provided.
  • the liquid-impregnated sheet may in particular be a face mask.
  • the present invention is a viscose rayon for nonwoven fabric used as a base material for a liquid-impregnated sheet used in a state impregnated with a liquid,
  • a viscose rayon having a single cross section and an unevenness of the cross section obtained by the following formula of 2.0 or less.
  • Concavity and convexity L 2 / (4 ⁇ ⁇ S) (In the formula, L is the circumferential length of the cross section, and S is the area of the cross section.)
  • the nonwoven fabric for liquid-impregnated sheet of the present invention exhibits high transparency in a wet state, if it is impregnated with liquid and applied to human skin, the color of the skin can be seen through, and it can be applied to articles. The surface of the article can be seen through.
  • the same effect can be obtained by applying the nonwoven fabric of the present invention to human skin or an article and then impregnating the nonwoven fabric with a liquid. Therefore, the present invention is preferably used in applications where it is desired to visually recognize an object when it is attached to the object in a state of being impregnated with a liquid.
  • the viscose rayon of the present invention shows high transparency when a nonwoven fabric containing the viscose rayon is impregnated with a liquid to form a liquid-impregnated sheet. Therefore, if the liquid-impregnated sheet obtained by impregnating the non-woven fabric containing the viscose rayon of the present invention with liquid is applied to human skin, the color of the skin can be seen through. See through. Alternatively, the same effect can be obtained by applying a nonwoven fabric containing the viscose rayon of the present invention to human skin or an article and then impregnating the nonwoven fabric with a liquid. That is, the viscose rayon of the present invention can provide a non-woven fabric suitable for use in applications where it is desired to visually recognize an object when it is attached to the object in a state of being impregnated with a liquid.
  • FIG. 2 is a photograph showing the surface of the nonwoven fabric of Example 1.
  • FIG. 2 is a photograph showing the surface of a nonwoven fabric of Comparative Example 1.
  • 2 shows absorption spectra of Examples 1 and 2 and Comparative Examples 1 and 2. It is the image after processing this in order to measure the optical micrograph (640 times) of the fiber side surface of the fiber 5 manufactured in the Example, and the number of recessed parts. It is a schematic diagram which shows the intersection of the recessed part observed on a fiber side surface and a measurement line.
  • 6 is a graph showing a decrease in moisture content until 360 minutes have passed after impregnation with 700% water for Examples 11 to 12 and Comparative Examples 12 to 14.
  • the nonwoven fabric of the present invention contains a specific viscose rayon.
  • the viscose rayon will be explained first.
  • One form of the viscose rayon constituting the nonwoven fabric of the present invention has a single cross-sectional structure, and the cross-sectional profile is, for example, a circle, ellipse, or jade, or a circle or ellipse with a cut. Or it is a jade ball shape.
  • a transverse section refers to a section cut in a direction perpendicular to the length of the fiber.
  • a cross-section having a single structure means that when the cross-section is magnified about 1000 times with a polarizing microscope, the section divided in the cross-section is not observed, and / or there is a difference in dyeability due to skin core staining. It means not.
  • the viscose rayon used in the present invention preferably does not have a skin core structure observed in the cross section of a normal viscose rayon.
  • normal viscose rayon is dyed with a skin core, there is a difference in dyeability between the skin part and the core part, for example, it is observed as the shade of the color after dyeing.
  • the core portion is observed as a light-colored portion surrounded by the skin portion.
  • FIG. 7 and 8 show optical micrographs (320 times) of skin core-stained ordinary viscose rayon and rayon having no skin core structure. As shown in FIG. 7, in a normal viscose rayon, there is a difference in dyeability between the skin part and the core part, the skin part is dark and the core part is thin.
  • Skin core dyeing is performed according to the following procedure.
  • Samples to be dyed (dyeing specimens) are collected, made into approximately 100 fiber bundles, made parallel with fibers using a sorter, and then wound tow around the dyed specimens to produce fiber for wax pillars. A bundle is obtained, and both ends of the bundle are tied with a black thread for binding. Next, the fiber bundle is once melted and then immersed in a cooled paraffin liquid and pulled up to solidify the paraffin to obtain a wax column having a diameter of about 5 mm. 2. Section preparation A wax column is cut into a predetermined length (10 mm) and placed on a wax column base. This is cut with a microtome with a cutting blade attached to obtain a section.
  • Meyer's egg white liquid is also called “egg white glycerin”.
  • the Mayer egg white liquid is prepared by foaming 50 g of egg white, adding 50 g of glycerin and 1 g of sodium salicylate into the foam, and then suction-filtering using a gold wrench.
  • As the staining solution 1 g of oxamine blue 4R is added to 100 cc of pure water and stirred and dissolved, and then 300 mg of sodium sulfate is added and stirred and dissolved.
  • the dyeing solution is heated to 85 ° C. while stirring the dyeing solution in a hot water bath.
  • the state of cellulose orientation is different between the skin part and the core part, and the difference in the orientation state is that the regeneration proceeds more in the surface part during the regeneration bath (spinning bath). It is caused by stretching in a state where regeneration is not progressing.
  • a rayon in which a difference in dyeability is not observed in the cross section is considered to have a single structure because cellulose is oriented in one direction over the entire fiber.
  • a viscose rayon having a single cross section can be obtained by reducing the regeneration rate of the spinning dope and stretching it in a state where the regeneration is delayed.
  • a rayon having a single cross-sectional structure exhibits high transparency because it does not have an interface through which light is refracted / reflected even when light is incident thereon.
  • the rayon having a single cross-section used in the present invention is referred to as “transparent rayon” for convenience.
  • the transparent rayon may have a circular, elliptical or jade shape in cross section.
  • the transparent rayon is manufactured so that the regeneration speed in the regeneration bath is slow so as to have a single structure. When the regeneration speed is lowered, dehydration proceeds slowly, so that unlike a normal viscose rayon, a cross section having a circular, elliptical or jade-shaped contour is easily obtained.
  • the jade shape includes an oval shape that is partially linear (that is, a shape close to a capsule), and an oval shape and a capsule shape that are partly gently constricted at the center.
  • the oval shape includes asymmetric shapes such as an oval shape and a tear shape.
  • the transparent rayon may have a circular, elliptical or jade shape with a cut in the cross-sectional profile.
  • the term “cut” refers to a recess whose length (depth) is sufficiently larger than the width, unlike the unevenness of the cross-sectional contour of a normal viscose rayon.
  • a concave portion that is 1/4 or more, or a rayon that has a flatness of 1.80 or more indicates a concave portion that is 1/4 or more of the length of the short side of the circumscribed rectangle for measuring the flatness.
  • the “passing diameter” refers to the longest line segment connecting any two points on the outline of the cross section.
  • the transparent rayon does not have unevenness, or even if it has, the number is small, the unevenness of the unevenness is small, or has 1 to 2 cuts. Smooth as a whole. For this reason, the transparent rayon is less likely to cause irregular reflection of light hitting the surface thereof as compared with a normal viscose rayon, which also improves the wet transparency of the nonwoven fabric formed using this.
  • the transparent rayon has a cross section in which the perimeter (L) of the cross section and the area (S) of the cross section are obtained, and the degree of unevenness calculated from the following formula using them is 2 or less.
  • Concavity and convexity L 2 / (4 ⁇ ⁇ S)
  • the cross section having an unevenness degree of 2 or less can be specified as having a smooth outline as a whole and different from a normal viscose rayon cross section (chrysanthemum cross section).
  • the degree of unevenness is more preferably 1.5 or less, even more preferably 1.3 or less, and most preferably 1.2 or less.
  • the degree of unevenness calculated by the above formula becomes large when the flatness of the cross section is large even if the outline of the cross section is smooth. Therefore, for example, a rayon having a flat cross section and two or three deep cuts, such as a viscose rayon containing silicon dioxide, which will be described later, has fine irregularities in the cross section. Even if not, the degree of unevenness may be 2 or more. According to the study by the inventors, a rayon having a cross-sectional flatness of 1.80 or more has a small number of fine irregularities in the cross-sectional outline and a transparent rayon if the unevenness is 2.50 or less. Was found to function as. Therefore, when the flatness of the cross section is 1.80 or more, the unevenness of the cross section is 2.50 or less, preferably 2.30 or less, more preferably 2.20 or less. A transparent rayon that can be used.
  • image processing software for example, Image J 1.48v
  • image processing software for example, Image J 1.48v
  • the degree of unevenness is measured by selecting 30 or more fibers randomly from a photograph taken with an electron microscope at a magnification of 1000 times, and showing the average value.
  • the electron microscope can be used to photograph a cross section by passing a rayon bundle through a hole in a plate member, cutting the rayon bundle with a sharp blade almost along the surface of the plate member, and exposing the cross section. You may implement using the produced sample.
  • the flatness of the cross section is the longest line segment connecting any two points of the outline of the cross section, that is, the length of the span A is a, perpendicular to the line segment A, and parallel to the line segment A
  • the length of a line segment B that forms a quadrilateral (rectangle or quadrilateral) circumscribing the cross section along with a straight line segment is represented by b, it is represented by a / b.
  • FIG. 11 is a schematic diagram showing how to obtain the flatness of the fiber.
  • the flatness of the cross section is also measured by randomly selecting 30 or more fibers from a photograph taken with an electron microscope at a magnification of 1000 times and showing the average value.
  • the number of side recesses may be obtained using a photograph taken with an optical microscope (transmission type) at a magnification of about 640 times. Specifically, a photograph is subjected to image processing, and after image processing, a line (including a line (base line) defining a target area to be divided into four equal parts) is drawn to remove the base line. The number of points where the line of the book (hereinafter referred to as “measurement line” for the sake of convenience) and the streak observed in black after image processing intersect is measured, and the average value thereof can be obtained. .
  • Image processing is performed according to the following procedure, for example.
  • Use paint.net V4.0.5 as image processing software select “Monochrome” from the “Adjust” menu to correct the brightness of the image, and convert the photo to black and white.
  • the image processing software Image J 1.48v is used to determine the brightness of the black and white converted image.
  • the luminance corresponds to the “Mean” value obtained from “Histogram” in the “Analyze” menu.
  • an image having a Mean value of 175 to 195 is used as an image for measuring the number of recesses on the side surface. Therefore, to obtain such a mean value, adjust the shooting conditions, etc., and take a picture of an enlarged image with an optical microscope, or select an optical microscope picture with such a mean value. Measure the number of recesses.
  • the fiber side surface is divided into four equal parts in the length direction, and a line perpendicular to the longitudinal direction is drawn, three measurement lines excluding the base lines on both sides, and the black streaks of the processed image Count the number of intersections with the (concave) and find the average value.
  • the base line for defining the quadrant area is a line segment connecting the upper end and the lower end of the fiber side surface, and is the line segment closest to the boundary of the imaging region among the line segments orthogonal to the longitudinal direction of the fiber. .
  • FIG. 4 an optical micrograph of a fiber side surface and an example of an image after image processing are shown in FIG. 4 (corresponding to a fiber 5 manufactured in an example described later), and a schematic diagram showing an intersection of a concave portion and a measurement line The figure is shown in FIG.
  • the line defining the upper and lower sides of the fiber side surface may appear as a dark black line, but this is not a recess, and the intersection of this and the measurement line is not counted as the number of recesses.
  • the number of recesses obtained using an image is preferably less than 3.
  • the transparent rayon may have a cross-sectional outline of a circle, an ellipse, or a jade, or a cut, a circle, an ellipse, or a jade, and a cross-sectional irregularity of 2 or less.
  • the transparent rayon may have less than 3 side recesses.
  • the transparent rayon has an oval or jade shape with a cross-sectional outline, or an oval or jade shape with a cut, a flatness of the cross section of 1.80 or more, and an unevenness of the cross section.
  • the transparent rayon may have a cross-sectional outline of a circle, an ellipse or a jade, or a circle having a cut, an ellipse or a jade, and the number of side recesses is less than three.
  • the transparent rayon may contain polyethylene glycol.
  • Polyethylene glycol (PEG) is added to the spinning dope.
  • PEG Polyethylene glycol
  • the addition of PEG decreases the regeneration rate of viscose, so that a transparent rayon having the specific cross-sectional structure and cross-sectional contour can be obtained.
  • the average molecular weight of polyethylene glycol is, for example, 200-7500. Since PEG having an average molecular weight of 1000 or more is a solid at room temperature, it is melted by heating or added as an aqueous solution.
  • the content of PEG in the transparent rayon is not particularly limited.
  • the clear rayon is selected from dimethylamine, cyclohexylamine, and hexamethylenediamine in order to reduce the regeneration rate of viscose instead of or together with PEG 1 Or it may contain multiple amines.
  • the transparent rayon may contain silicon dioxide.
  • a silicate compound containing an alkali metal for example, sodium silicate (Na 2 O.nSiO 2 .xH 2 O, where n is 1 to 3, x is 10 to 20) is added to the spinning dope, and this is added to sulfuric acid (H 2 SO 4 )
  • the silicic acid compound in the spinning dope reacts with sulfuric acid to change to silicon dioxide (SiO 2 , but polymer), and the resulting viscose rayon contains silicon dioxide.
  • a silicate compound containing an alkali metal also reduces the regeneration rate of viscose, so that a transparent rayon having the specific cross-sectional structure and cross-sectional contour can be obtained.
  • the cross section of transparent rayon containing silicon dioxide is generally obtained as having a large flatness, having 2 to 3 cuts, and having a cross section that does not have the fine irregularities found in ordinary viscose rayon. It is done.
  • the content of silicon dioxide in the transparent rayon is not particularly limited.
  • the silicic acid compound containing an alkali metal is 10% by mass to 100% by mass in terms of silicon dioxide after reacting with sulfuric acid with respect to the mass of cellulose contained in the spinning stock solution. %, Preferably 25% to 70% by mass.
  • the fiber contains silicon dioxide present after spinning such a spinning dope. When there is too little content of silicon dioxide, it will become difficult to obtain the said specific cross-sectional structure and cross-sectional outline. When there is too much content of silicon dioxide, intensity
  • Transparent rayon containing silicon dioxide has a silicon content measured by X-ray fluorescence analysis of, for example, 5% by mass to 30% by mass, particularly 8% by mass to 23% by mass, more particularly 13% by mass to 19% by mass. There may be.
  • a transparent rayon having a silicon content within these ranges is a balance between transparency and strength. Since silicon dioxide itself is a highly transparent substance, a nonwoven fabric containing a transparent rayon that satisfies the silicon content described above tends to be highly transparent. Accordingly, the cross section has a single structure, the silicon content is contained in the fiber, and the silicon content measured by fluorescent X-ray analysis is 5% by mass to 30% by mass, particularly 8% by mass to 23%.
  • a non-woven fabric containing viscose rayon having a mass percentage of 13% by mass to 19% by mass is useful as a non-woven fabric used as a base material for a liquid-impregnated sheet used in a liquid-impregnated state because of its high transparency. is there.
  • the fineness and fiber length of the transparent rayon are appropriately selected according to the desired form and physical properties of the nonwoven fabric.
  • the form and physical properties of the nonwoven fabric are determined according to the use of the liquid-impregnated sheet.
  • the fineness of the transparent rayon is preferably about 0.1 dtex to 6 dtex, and more preferably about 0.7 dtex to 3.0 dtex.
  • a transparent rayon having a fineness within this range is suitable for ensuring flexibility and is also preferred from the viewpoint of nonwoven fabric production. If the fineness of the transparent rayon is too small, the transparency may be lowered, or the fibers may fall out when the fibers are entangled, resulting in a decrease in the basis weight. The greater the fineness of the transparent rayon, the greater the transparency of the nonwoven fabric. However, if it is too large, the nonwoven fabric may be rough and the tactile sensation may be reduced.
  • the fiber length is preferably 25 mm or more and 100 mm or less, and more preferably 30 mm or more and 70 mm or less.
  • the fiber length is preferably 1 mm or more and 50 mm or less, and more preferably 5 mm or more and 30 mm or less.
  • the fiber length is preferably 0.5 mm or more and 20 mm or less, and more preferably 1 mm or more and 10 mm or less.
  • the transparent rayon preferably has a dry strength of 1.0 to 3.0 cN / dtex, more preferably 1.5 to 2.5 cN / dtex.
  • the transparent rayon also preferably has a wet strength of 0.5 to 2.0 cN / dtex, more preferably 0.7 to 1.5 cN / dtex.
  • the fiber strength is a value measured according to JIS L 1015.
  • a transparent rayon has the intensity
  • the transparent rayon preferably has an average polymerization degree of cellulose of 200 to 350. Also when the average degree of polymerization of cellulose is within this range, the flexibility of the nonwoven fabric is improved.
  • a transparent rayon is a viscose liquid having a composition used for producing a normal viscose rayon. It may be produced by spinning one added so as to be in the range of 5 mass% to 4.5 mass%.
  • PEG plays the role of reducing the regeneration rate in the regeneration bath, and it is possible to obtain a rayon having a single structure and no cross-sectional contour or unevenness. To do. If the ratio of PEG is too small, the regeneration speed cannot be reduced, and if it is too large, the regeneration speed is too low and fibers cannot be produced with good productivity.
  • the viscose includes one or more amines selected from components other than PEG, such as dimethylamine, cyclohexylamine, and hexamethylenediamine, which, by adding to the viscose, reduce the regeneration rate of the viscose.
  • PEG poly(ethylene glycol)
  • PEG is also thought to play a role in improving the flexibility of the resulting nonwoven fabric. PEG is considered to inhibit the binding between cellulose molecules as a foreign substance, thereby improving the flexibility of the nonwoven fabric.
  • PEG is hydrophilic, when the nonwoven fabric (ie, rayon contained therein) is impregnated with liquid, the PEG in the fiber and water become familiar and improve the flexibility of the wet nonwoven fabric. it is conceivable that.
  • the transparent rayon may contain components other than PEG, such as silicate, together with or in place of PEG. Components other than PEG can also contribute to improving the flexibility of the fiber as foreign matter. Components other than PEG are also preferably hydrophilic. Components other than PEG that improve the hydrophilicity of the transparent rayon may reduce the regeneration speed of the above-described viscose.
  • the transparent rayon can be produced, for example, by spinning a viscose solution to which PEG and sodium carbonate have been added in a regeneration bath used for producing ordinary viscose rayon.
  • a regeneration bath having a sulfuric acid concentration of 70 g / l to 150 g / l, a zinc sulfate concentration of 0 to 30 g / l, and a sodium sulfate concentration of 150 g / l to 350 g / l can be used.
  • the regeneration bath temperature is not particularly limited, but is generally 45 ° C to 55 ° C. Other conditions may also be standard.
  • After spinning it is subjected to water washing, desulfurization, and bleaching in the same manner as in ordinary rayon production, and then to water washing and drying. The dried fiber is cut into a predetermined fiber length.
  • a transparent rayon is obtained by reacting a silicic acid compound containing an alkali metal, for example, sodium silicate, with sulfuric acid, with respect to the mass of cellulose, in a viscose liquid having a composition used for producing a normal viscose rayon.
  • a material added so as to be in the range of 10% by mass to 100% by mass in terms of silicon dioxide may be produced by spinning.
  • the addition amount of the silicic acid compound containing an alkali metal is preferably in the range of 25% by mass to 70% by mass in terms of silicon dioxide after reacting with sulfuric acid with respect to the mass of cellulose.
  • the silicic acid compound containing an alkali metal serves to reduce the regeneration rate in the regeneration bath, and has a single structure, and a rayon with a contour that has no unevenness or small unevenness is obtained. To be able to. If the proportion of the silicate compound containing the alkali metal is too small, the regeneration rate cannot be reduced, and if it is too much, the strength of the fiber may be reduced.
  • a transparent rayon can be produced by spinning a viscose solution to which a silicic acid compound containing an alkali metal, particularly sodium silicate, is added, in a regeneration bath used for producing ordinary viscose rayon.
  • a regeneration bath having a sulfuric acid concentration of 110 g / l to 170 g / l, a zinc sulfate concentration of 10 to 30 g / l, and a sodium sulfate concentration of 150 g / l to 350 g / l can be used.
  • the regeneration bath temperature is not particularly limited, but is, for example, 45 ° C. to 65 ° C. Other conditions may also be standard.
  • After spinning it is subjected to water washing, desulfurization, and bleaching in the same manner as in ordinary rayon production, and then to water washing and drying. The dried fiber is cut into a predetermined fiber length.
  • the nonwoven fabric for liquid-impregnated sheets of the present invention exhibits high transparency in a wet state by including the transparent rayon described above.
  • the structure of the nonwoven fabric of this invention is not specifically limited.
  • the nonwoven fabric may be made of any web selected from card webs such as parallel web, cross web, semi-random web and random web, air lay web, wet paper web, and spunbond web.
  • the fibers may be entangled and integrated by a hydroentanglement method or a needle punch method, or may be integrated by a thermal bond or a chemical bond.
  • the transparent rayon is preferably contained in an amount of 50% by mass or more, more preferably 70% by mass or more, and further preferably 90% by mass or more.
  • the nonwoven fabric may be composed only of transparent rayon. The greater the percentage of transparent rayon, the better the wet transparency of the nonwoven fabric.
  • the other fibers are not particularly limited, and natural fibers, recycled fibers other than transparent rayon, semi-synthetic fibers, pulp fibers such as wood pulp and non-wood pulp, and It may be one or more fibers selected from synthetic fibers.
  • Natural fibers are, for example, cotton, hemp, silk and wool, and regenerated fibers (excluding transparent rayon) are ordinary viscose rayon, solvent-spun cellulose fiber (for example, Tencel (registered trademark)), and copper ammonia rayon. (Also called cupra), polynosic and the like.
  • the synthetic fiber is selected from, for example, a polyester resin selected from polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, and a copolymer thereof; polypropylene, polyethylene, polymethylpentene, and the like.
  • Polyolefin-based resins selected from nylon 6, nylon 12, nylon 66, and the like; and single fibers or composite fibers (for example, core sheath) formed of one or more resins selected from acrylic resins Type composite fiber, split type composite fiber, etc.
  • hydrophilic fibers are preferably hydrophilic in order to impregnate a nonwoven fabric with more liquid. That the fiber is hydrophilic means that its official moisture content is 5% or more.
  • the hydrophilic fibers include, in addition to the above natural fibers, hydrophilic synthetic fibers and hydrophobic synthetic fibers (synthetic fibers having an official moisture content of less than 5%) subjected to a hydrophilic treatment. Examples of the hydrophilic treatment include corona discharge treatment, sulfonation treatment, graft polymerization treatment, kneading of a hydrophilic agent into fibers, and application of a durable oil agent.
  • the fineness and fiber length of the other fibers are not particularly limited and are selected according to the desired form and physical properties of the nonwoven fabric, and examples thereof are as described above in connection with the transparent rayon.
  • Other fibers may be used by mixing with transparent rayon.
  • the nonwoven fabric may be a laminated nonwoven fabric obtained by laminating a layer made of transparent rayon and a layer made of other fibers.
  • the basis weight of the nonwoven fabric is selected according to the use of the liquid-impregnated sheet, and may be, for example, 10 g / m 2 to 200 g / m 2 .
  • the basis weight of the nonwoven fabric may be, for example, 30 g / m 2 to 100 g / m 2 , particularly 35 g / m 2 to 50 g / m 2 .
  • the basis weight increases, the transparency of the nonwoven fabric in a wet state tends to decrease.
  • the non-woven fabric of the present invention has improved transparency in the wet state by the transparent rayon itself suppressing light reflection / refraction.
  • the transparent rayon is a nonwoven fabric produced by the hydroentanglement method, in which the proportion of the region where the fiber density is lower due to the collision of the water stream is increased, thereby increasing the overall transparency of the nonwoven fabric, thereby making the nonwoven fabric transparent. It has been found that the property can be improved. This will be described below.
  • the nonwoven fabric obtained by placing the fiber web on a fine mesh and carrying out hydroentanglement treatment has a fiber density lower than that of the region where the fiber density is reduced due to the collision of the water flow and the region where the fiber density is reduced.
  • the stripes are formed in a fine stripe pattern as a whole.
  • a fiber density falls in a wider range by the collision of a water flow.
  • region) in which the fiber density fell contains the space
  • FIG. 1 shows a photograph of the surface of a hydroentangled nonwoven fabric made of transparent rayon magnified 50 times with an optical microscope.
  • This hydroentangled non-woven fabric is a non-woven fabric of Example 1 described later, and a wet papermaking web consisting of only transparent rayon with a fineness of 2.2 dtex with a basis weight of about 40 g / m 2 and orifices with a pore diameter of 0.13 mm at 1.0 mm intervals. It is the nonwoven fabric obtained by performing a hydroentanglement process using the provided nozzle. Although the orifice diameter of the orifice provided in the nozzle is considerably smaller than the interval between the orifices, in FIG.
  • the width of the low fiber density region formed by the movement of the fibers by the collision of the water flow is It is considerably larger than the region sandwiched between the low fiber density regions (high fiber density region).
  • the width of the low fiber density region formed by the collision of the water flow is not so different from the width of the high fiber density region even when observing a nonwoven fabric having the same configuration made of ordinary viscose rayon (see FIG. 2). ).
  • the transparent rayon When transparent rayon is used, the reason why the fiber density decreases due to the collision of water flow over a wider area is not clear, but transparent rayon has a smooth cross-sectional profile and reduces friction between fibers. It is considered that the fiber density is lowered in a wider region because the water stream easily moves when it hits the fiber. In any case, the transparent rayon can effectively improve the transparency of the nonwoven fabric formed by the hydroentanglement method by increasing the proportion of the low fiber density region in the nonwoven fabric.
  • the low fiber density region resulting from the use of transparent rayon is wider than the high fiber density region with higher fiber density located therebetween, preferably the width of the low fiber density region is at least twice the width of the high fiber density region. , More preferably 3 times or more, even more preferably 4 times or more.
  • the width of the low fiber density region is larger than the width of the high fiber density region, high transparency can be secured.
  • the width of the low fiber density region is preferably 10 times or less, more preferably 7 times or less, and even more preferably 5 times or less that of the high fiber density region. If the proportion occupied by the low fiber density region is too large, the mechanical properties of the nonwoven fabric may deteriorate.
  • a transparent rayon having a higher fineness for example, a fineness of 2.0 dtex or more and 3.0 dtex or less is used.
  • the form of the web is not particularly limited, but when a wet papermaking web is used, the proportion of the low fiber density region tends to be larger.
  • the conditions of the hydroentanglement treatment for obtaining a nonwoven fabric having a large proportion of the low fiber density region may be generally employed conditions.
  • the support on which the web is used, which is used in hydroentanglement processing does not have an opening with an opening area of more than 0.2 mm 2 per one, and no protrusion or pattern is formed. It may be.
  • the support is preferably a plain weave support of 80 mesh or more and 100 mesh or less.
  • Hydroentanglement treatment is performed by applying a water flow with a water pressure of 1 MPa or more and 15 MPa or less from a nozzle in which orifices having a hole diameter of 0.05 mm or more and 0.5 mm or less are provided at intervals of 0.3 mm or more and 1.5 mm or less. It may be carried out by spraying 1 to 5 times on the back surface.
  • the water pressure is preferably 1 MPa or more and 10 MPa or less, more preferably 1 MPa or more and 7 MPa or less.
  • the nonwoven fabric for liquid-impregnated sheets of the present invention exhibits high transparency in a wet state, when the liquid-impregnated sheet non-woven fabric is affixed to an object in a state of being impregnated with a liquid, the object underneath is more easily visible.
  • Transparency in a wet state is obtained by, for example, attaching a nonwoven fabric impregnated with 700 parts by mass of water to 100 parts by mass of a nonwoven fabric on a black acrylic plate, and lightness L of reflected light of the light irradiated to the nonwoven fabric. It can be evaluated by measuring * . It can be said that the smaller the L * of the reflected light, the higher the transparency.
  • L * of reflected light of the nonwoven fabric in a wet state is preferably 26 or less, more preferably 22 or less.
  • the transparency of the nonwoven fabric can be evaluated by placing the dried nonwoven fabric on a black acrylic plate and measuring the lightness L * of the reflected light. The greater the L * of the nonwoven fabric in the dried state, the higher the transparency in the wet state.
  • the transparency of the nonwoven fabric in the wet state can also be evaluated by measuring the lightness L * of the light transmitted through the wet nonwoven fabric.
  • L * of the transmitted light of the nonwoven fabric in a wet state is preferably 22 or more, more preferably 23 or more, and still more preferably 24 or more.
  • the transparency of the nonwoven fabric can be evaluated by transmitting light to the dried nonwoven fabric and measuring the lightness L * of the transmitted light. The greater the L * of the transmitted light of the dried nonwoven fabric, the higher the wet transparency.
  • the lightness L * of the transmitted light in a wet state is impregnated with 700 parts by mass of water with respect to 100 parts by mass of the nonwoven fabric, and this is gripped by a support having an aperture having a diameter of 28 mm and transmitted through the gripped nonwoven fabric. It can be evaluated by measuring the lightness L * of the light. Alternatively, the transparency of the nonwoven fabric can also be evaluated by gripping the dried nonwoven fabric with a support having an aperture having a diameter of 28 mm and measuring the lightness L * of the light transmitted through the gripped nonwoven fabric.
  • the transparency of the nonwoven fabric can be evaluated by measuring the light transmittance in a dry state not impregnated with a liquid. The higher the light transmittance in the dry state, the higher the transparency in the wet state.
  • the average transmittance (arithmetic average value) of transmittance measured with a spectrophotometer for light having a wavelength in the range of 400 nm to 800 nm in a dry state is preferably 57% or more. More preferably, the transparency is 60% or more.
  • the nonwoven fabric for liquid-impregnated sheet of the present invention has a longitudinal bending resistance of preferably 55 mm or less, more preferably 50 mm or less, and a transverse bending resistance of preferably 25 mm or less, more preferably 23 mm or less. .
  • the bending resistance is measured according to JIS L 1096 (45 ° cantilever method).
  • the nonwoven fabric configured so that the bending resistance is within this range is soft, has good followability to the object, and can be well adhered to the skin of a human body, particularly a face with many irregularities.
  • the nonwoven fabric of the present invention is for impregnating liquid.
  • the type of liquid and the amount of impregnation are selected according to the application.
  • the liquid-impregnated sheet is provided as an interpersonal wet wiping sheet, water or an aqueous solution containing a cleaning component is impregnated with 100 parts by mass or more and 1000 parts by mass or less with respect to 100 parts by mass of the nonwoven fabric. It may be impregnated in an amount.
  • the interpersonal wet wiping sheet is provided as, for example, a hand wipe, a wet wipe, a menstrual wipe, a makeup remover sheet, a face-wash sheet, an antiperspirant sheet, and a nail remover.
  • the liquid containing the active ingredient is 150 parts by mass with respect to 100 parts by mass of the nonwoven fabric.
  • the impregnation amount may be not less than 2,500 parts by mass and not more than 2500 parts by mass, preferably not less than 400 parts by mass and not more than 2000 parts by mass.
  • the active ingredient examples include, but are not limited to, a moisturizing ingredient, a keratin softening ingredient, a cleansing ingredient, an antiperspirant ingredient, an aroma ingredient, a whitening ingredient, a blood circulation promoting ingredient, an ultraviolet ray preventing ingredient, and a slimming ingredient.
  • the face mask has a shape suitable for covering the face, and further, for example, in a form in which openings or notches by punching are provided as necessary in portions corresponding to eyes, nose and mouth.
  • the face mask may have a shape that covers only a part of the face (for example, the eyes, mouth, nose or cheek).
  • the face mask may be provided as a set of sheets covering the periphery of the eyes and a sheet covering the periphery of the mouth, or may be provided as a set of sheets covering three or more portions separately.
  • the liquid-impregnated sheet may be used for an objective purpose, and may be used by being attached to an object for the purpose of supplying a liquid to the object or keeping the object wet.
  • the liquid-impregnated sheet of the present invention may be impregnated with a cleaning agent or the like used for the purpose of softening stuck dirt or separating stuck dirt from an object.
  • the present invention includes the following aspects.
  • Non-woven fabric A nonwoven fabric used as a base material for a liquid-impregnated sheet used in a state impregnated with a liquid, A non-woven fabric containing viscose rayon having a cross section of a single structure and an unevenness of a cross section obtained by the following formula of 2.0 or less.
  • a nonwoven fabric used as a base material for a liquid-impregnated sheet used in a state impregnated with a liquid A nonwoven fabric comprising a viscose rayon having a single cross-section and having less than 3 recesses determined from a micrograph of a fiber side surface.
  • Aspect 7) The nonwoven fabric of embodiment 1, 2, 3, or 6 wherein the viscose rayon comprises polyethylene glycol.
  • a liquid-impregnated sheet wherein the nonwoven fabric according to any one of aspects 1 to 8 is used as a base material, and 100 parts by mass of the base material is impregnated with a liquid in a proportion of 150 parts by mass or more and 2500 parts by mass or less.
  • a viscose rayon for nonwoven fabric used as a base material for a liquid-impregnated sheet used in a liquid-impregnated state A viscose rayon having a cross section of a single structure and an unevenness of the cross section determined by the following formula of 2.0 or less.
  • a viscose rayon for nonwoven fabric used as a base material for a liquid-impregnated sheet used in a liquid-impregnated state Viscose rayon having a single cross-section and a cross-sectional profile that is circular, oval or jade, or a round, oval or jade shape with a cut.
  • a viscose rayon for nonwoven fabric used as a base material for a liquid-impregnated sheet used in a liquid-impregnated state The cross section has a single structure, and the flatness of the cross section obtained by the following formula is 1.80 or more, and the unevenness of the cross section obtained by the following formula is 2.50 or less, Viscose rayon.
  • Flatness a / b (In the formula, a is the length of the longest line segment A connecting any two points of the cross section, and b is a cross section along with the line segment perpendicular to the line segment A and parallel to the line segment A.
  • a viscose rayon for nonwoven fabric used as a base material for a liquid-impregnated sheet used in a liquid-impregnated state A viscose rayon having a single structure in cross section and having less than 3 recesses determined from micrographs of fiber side surfaces.
  • Aspect 15 The viscose rayon according to any one of embodiments 11 to 14, wherein the liquid-impregnated sheet is a face mask.
  • [Fiber 1] Transparent rayon
  • 0.6% by mass of polyethylene glycol (trade name PEG # 1540, manufactured by NOF Corporation) having an average molecular weight of about 1500 and heated and melted at 60 ° C. was added.
  • sodium carbonate (trade name, sodium soda ash sodium carbonate, manufactured by Tokuyama Co., Ltd.) was dissolved in water to obtain a 22% by mass aqueous sodium carbonate solution, which was 2.2% by mass of sodium carbonate relative to viscose. % And stirred until they were fully mixed. At this time, the temperature of the viscose was 20 ° C.
  • This viscose solution was spun in a regeneration bath of 110 g / l of sulfuric acid, 14 g / l of zinc sulfate and 350 g / l of sodium sulfate at a spinning speed of 50 m / min and a draw ratio of 40%. Got. This was cut into a fiber length of 7 mm, desulfurized and bleached.
  • the obtained viscose rayon was subjected to skin core dyeing by the above-mentioned method, and the state after dyeing was confirmed (optical microscope, 640 times).
  • the dyeability (dyeing) between the inner peripheral part and the outer peripheral part of the cross section of the fiber was confirmed. No significant difference was observed in the subsequent color shading, and it was confirmed to be of a single structure (FIG. 8).
  • the outline of the cross section was circular, elliptical, or jasper, and did not have irregularities with large undulations. Furthermore, no streak-like recess was observed on the side surface.
  • the obtained fiber had a dry strength of 1.81 cN / dtex and a wet strength of 0.94 cN / dtex.
  • Fiber 2 Transparent rayon
  • a transparent rayon was obtained under the same conditions and method as the production of the fiber 1 except that the fineness was adjusted to 0.8 dtex.
  • the resulting fiber had a dry strength of 2.06 cN / dtex and a wet strength of 1.06 cN / dtex.
  • the cross-sectional outline was chrysanthemum, had many irregularities, and there were many streak-like depressions on the side of the fiber.
  • the obtained fiber had a dry strength of 2.30 cN / dtex and a wet strength of 1.30 cN / dtex.
  • a viscose rayon having a fineness of 0.8 dtex was obtained under the same conditions and method as in the production of fiber 2 except that polyethylene glycol and sodium carbonate were not added to the viscose.
  • the obtained viscose rayon had a skin core structure, the cross-sectional outline was chrysanthemum shape, had many irregularities, and many streak-like concave portions were observed on the side surface of the fiber.
  • the obtained fiber had a dry strength of 2.30 cN / dtex and a wet strength of 1.30 cN / dtex.
  • Fiber 5 Transparent rayon Spinning was carried out under the same conditions and method as for fiber 1 to obtain a transparent rayon with a fiber length of 40 mm.
  • Transparent rayon was obtained under the same conditions and method as the production of fiber 1 except that the fineness was 1.7 dtex and the fiber length was 40 mm.
  • the resulting fiber had a dry strength of 1.95 cN / dtex and a wet strength of 0.98 cN / dtex.
  • Fiber 8-2 transparent rayon Except for the addition of 0.5% by mass of polyethylene glycol to viscose, a fineness of 1.7 dtex, and a fiber length of 40 mm, the same conditions and methods as in the production of fiber 1 were used. A transparent rayon was obtained. The resulting fiber had a dry strength of 1.98 cN / dtex and a wet strength of 1.02 cN / dtex.
  • Transparent rayon was obtained under the same conditions and method as the production of fiber 1 except that sodium carbonate was not added, the fineness was 1.7 dtex, and the fiber length was 40 mm.
  • the resulting fiber had a dry strength of 2.05 cN / dtex and a wet strength of 1.03 cN / dtex.
  • the viscose rayon was prepared under the same conditions and method as the production of the fiber 1 except that polyethylene glycol and sodium carbonate were not added to the viscose, the fineness was 1.7 dtex, and the fiber length was 38 mm. Got.
  • the resulting fiber had a dry strength of 2.33 cN / dtex and a wet strength of 1.32 cN / dtex.
  • a viscose stock solution was prepared with a composition having a cellulose content of 8.5% by mass, a sodium hydroxide addition amount of 5.7% by mass, and carbon disulfide 32% by mass (based on the mass of cellulose).
  • a mixed solution of No. 3 sodium silicate, sodium hydroxide and water is added to the prepared viscose stock solution, and the composition of the viscose solution becomes 7.2 mass% cellulose and 7.4 mass% sodium hydroxide.
  • a sodium silicate-added viscose solution was obtained.
  • the addition rate of sodium silicate was 50% by mass with respect to the cellulose mass in terms of SiO 2 .
  • the above-mentioned sodium silicate-added viscose liquid was spun at a spinning speed of 50 m / min and a draw rate of 50% by a two-bath tension spinning method to obtain a viscose rayon tow having a fineness of about 2.2 dtex.
  • the composition of the first bath (spinning bath) was 115 g / liter of sulfuric acid, 15 g / liter of zinc sulfate, 350 g / liter of sodium sulfate, and the temperature was 48 ° C.
  • the temperature of the second bath (hot water bath) was 85 ° C.
  • the tow was cut into a fiber length of 38 mm using a cutter, then subjected to hot water treatment, bleaching, pickling and washing, and then dried.
  • the resulting fiber had a dry strength of 1.27 cN / dtex and a wet strength of 0.60 N / dtex.
  • An electron micrograph showing a cross section of the fiber 10 is shown in FIG. Moreover, it was 17 mass% when the silicon content of the obtained fiber was measured by the fluorescent X ray analysis. X-ray fluorescence analysis was performed according to the following procedure.
  • X-ray fluorescence analysis was performed by theoretical calculation using the FP method using a fluorescent X-ray analyzer “LAB CENTER XRF-1700” manufactured by Shimadzu Corporation. The outline and measurement conditions of this measuring apparatus are as follows.
  • the temperature of the viscose was 20 ° C.
  • This viscose solution was spun in a regeneration bath of 110 g / l sulfuric acid, 14 g / l zinc sulfate and 350 g / l sodium sulfate at a spinning speed of 50 m / min and a draw ratio of 40%.
  • Got. This was cut into a fiber length of 51 mm, desulfurized and bleached.
  • the outline of the cross-section is circular, elliptical, or jade, and has one deep cut, and other irregularities with large undulations Did not have. Further, on the side surface, no streak-like concave portion other than the cut was observed.
  • the resulting fiber had a dry strength of 2.16 cN / dtex and a wet strength of 1.22 cN / dtex.
  • Fibers 1 and 2 and fibers 3 and 4 were wet-made to obtain wet paper-making webs having a basis weight of about 40 g / m 2 .
  • the wet papermaking web was hydroentangled to entangle the fibers.
  • Hydroentanglement treatment uses a nozzle with a pore diameter of 0.13 mm provided at 1.0 mm intervals to inject a 2 MPa columnar water stream once on one side of the web and a 4 MPa columnar water stream on the other side.
  • a 4 MPa columnar water stream was sprayed once more on the surface on which the columnar water stream was previously ejected.
  • the fiber web was subjected to a drying treatment to obtain a nonwoven fabric.
  • a photograph taken by enlarging the surface of the nonwoven fabric of Example 1 50 times with an optical microscope is shown in FIG.
  • Example 3 Comparative Examples 3 to 5
  • a random web having a basis weight of 40 g / m 2 was prepared by using a random card machine using each of the fibers 5 to 8.
  • the random web was subjected to hydroentanglement treatment to entangle the fibers.
  • a 3 MPa columnar water stream is sprayed once on one side of the web using a nozzle having pores of 0.13 mm spaced at intervals of 1.0 mm, and a 5 MPa columnar water stream is applied to the other surface.
  • a 5 MPa columnar water flow was injected once more on the surface on which the columnar water flow was previously jetted.
  • the fiber web was subjected to a drying treatment to obtain a nonwoven fabric.
  • a photograph taken by enlarging the surface of the nonwoven fabric of Example 3 50 times with an optical microscope is shown in FIG.
  • Table 2 shows the basis weight and thickness of the nonwoven fabrics of Examples 1 to 3 and Comparative Examples 1 to 5. Further, in order to evaluate the transparency of the nonwoven fabrics of Examples 1 to 3 and Comparative Examples 1 to 5, L * of reflected light in the dry state and the wet state was obtained. L * of each nonwoven fabric is shown in Table 2. The method for obtaining the thickness and L * is as follows. (thickness) Using a thickness measuring machine (trade name: ID-C1012CX, manufactured by Mitutoyo Corporation), measurement was performed with a load of 3 g and 20 g applied per 1 cm 2 of the sample.
  • Dry state A non-woven fabric is placed on the surface of a black acrylic plate, and using a colorimetric color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd., trade name ZE-2000), L * , a * of reflected light from the non-woven fabric and the b * were measured, L * a black acrylic from measurements, a * and b * values (2.91, -1.11,0.63) by subtracting, for each non-woven fabric L *, was determined a * and b *.
  • Wet state impregnated with 700 parts by weight of water to 100 parts by weight of non-woven fabric and brought into close contact with the surface of the black acrylic plate.
  • Example 1 63.0%
  • Comparative Example 2 55.4% (Measurement of light transmittance)
  • a spectrophotometer (trade name U-3900, manufactured by Hitachi High-Technologies Corporation)
  • an absorption spectrum was obtained in the range of 250 nm to 900 nm.
  • Example 3 For the nonwoven fabrics of Example 3 and Comparative Examples 3 to 5, the bending resistance was measured according to JIS L 1096 (45 ° cantilever method). Two samples were prepared for each example, and the bending resistance in the vertical and horizontal directions was measured for each sample, and the average was obtained. Table 3 shows the measurement results.
  • the secondary swelling degree of the fibers used in Example 3 and Comparative Examples 3 and 5 and the water absorption of the nonwoven fabrics of Example 3 and Comparative Examples 3 and 5 were measured by the following methods. For each example, two samples were prepared, the degree of secondary swelling and water absorption were measured, and the average was obtained. Table 4 shows the measurement results.
  • Example 1 Among nonwoven fabrics made of short fibers and made from wet webs, Example 1 had the lowest dry and wet L * and highest light transmittance in the visible region (approximately 400 nm to 800 nm). . Example 2 also showed high transparency. Even when the nonwoven fabric was produced from the card web, the nonwoven fabric (Example 3) made of transparent rayon showed high transparency. Nonwoven fabrics made of ordinary viscose rayon (Comparative Examples 1 to 3) had higher L * values for both nonwoven fabrics made from wet papermaking webs and card webs compared to the Examples. The non-woven fabric (Comparative Examples 4 and 5) composed of a card web of solvent-spun cellulose fibers also had a higher L * than the non-woven fabric of Example 3.
  • a nonwoven fabric exhibiting high transparency in a wet state can be obtained by using transparent rayon.
  • the nonwoven fabric comprised with the transparent rayon has a large ratio of the low fiber density region as shown in FIG.
  • the nonwoven fabric of the present invention was slightly harder than the nonwoven fabric of Comparative Example 3 that usually used rayon as viewed from the bending resistance, but the nonwoven fabrics of Comparative Examples 4 and 5 using solvent-spun cellulose fibers and It was soft compared.
  • the transparent rayon constituting the nonwoven fabric of the present invention has the same degree of secondary swelling as ordinary viscose rayon (fiber used in Comparative Example 4), and solvent-spun cellulose fiber (Comparative Example 5).
  • the secondary swelling degree was higher than that of the fiber used in the above.
  • the nonwoven fabric of the present invention has a water absorption rate comparable to that of the nonwoven fabric of Comparative Example 4 made of ordinary viscose rayon, and is higher in water absorption than the nonwoven fabric of Comparative Example 5 made of solvent-spun cellulose fiber. Showed the rate.
  • the nonwoven fabric of the present invention has higher water absorption and liquid retention than a liquid retention sheet composed of solvent-spun cellulose fibers exemplified in Patent Document 1, for example.
  • the nonwoven fabric of the present invention has a high water absorption rate, it is easy to retain more water in a wet state, which is coupled with high transparency caused by the fiber cross-sectional structure of the transparent rayon and the like in a wet state. It is thought that it contributes to the improvement of transparency of the nonwoven fabric.
  • Examples 4 to 5, Comparative Examples 6 to 7 Each of the fibers shown in Table 5 was used to obtain a wet papermaking web having a basis weight shown in Table 5 (all aimed at 50 g / m 2 ).
  • the wet papermaking web was hydroentangled to entangle the fibers.
  • Hydroentanglement treatment uses a nozzle with a pore diameter of 0.13 mm provided at 1.0 mm intervals to inject a 2 MPa columnar water stream once on one side of the web and a 4 MPa columnar water stream on the other side.
  • a 4 MPa columnar water stream was sprayed once more on the surface on which the columnar water stream was previously ejected.
  • the fiber web was subjected to a drying treatment to obtain a nonwoven fabric.
  • Examples 6 to 10, Comparative Examples 8 to 11 Using the fibers shown in Table 5, a random web having a basis weight shown in Table 5 was produced with a random card machine. The random web was subjected to hydroentanglement treatment to entangle the fibers. In the hydroentanglement treatment, a 3 MPa columnar water stream is sprayed once on one side of the web using a nozzle having pores of 0.13 mm spaced at intervals of 1.0 mm, and a 5 MPa columnar water stream is applied to the other surface. Next, a 5 MPa columnar water flow was injected once more on the surface on which the columnar water flow was previously jetted. Subsequently, the fiber web was subjected to a drying treatment to obtain a nonwoven fabric.
  • hydroentanglement treatment a 3 MPa columnar water stream is sprayed once on one side of the web using a nozzle having pores of 0.13 mm spaced at intervals of 1.0 mm, and a 5 MPa columnar water stream is applied to the other surface
  • L * of transmitted light in a dry state and a wet state was determined.
  • L * of each nonwoven fabric is shown in Table 5.
  • the method for obtaining the transmitted light L * is as follows. (How to find L * of transmitted light) Dry state: L * of light passing through the nonwoven fabric using a calorimetric color difference meter (trade name ZE-2000, manufactured by Nippon Denshoku Industries Co., Ltd.) by grasping the nonwoven fabric on a support having an aperture having a diameter of 28 mm . And L * of each nonwoven fabric was determined.
  • Examples 11 to 12, Comparative Examples 12 to 14 Using the fibers shown in Table 6, a random web having a basis weight shown in Table 6 was produced with a random card machine. The random web was subjected to hydroentanglement treatment to entangle the fibers. In the hydroentanglement treatment, a 3 MPa columnar water stream is sprayed once on one side of the web using a nozzle having pores of 0.13 mm spaced at intervals of 1.0 mm, and a 5 MPa columnar water stream is applied to the other surface. Next, a 5 MPa columnar water flow was injected once more on the surface on which the columnar water flow was previously jetted. Subsequently, the fiber web was subjected to a drying treatment to obtain a nonwoven fabric.
  • hydroentanglement treatment a 3 MPa columnar water stream is sprayed once on one side of the web using a nozzle having pores of 0.13 mm spaced at intervals of 1.0 mm, and a 5 MPa columnar water stream is applied to the other surface
  • the drying rates of the nonwoven fabrics of Examples 11 to 12 and Comparative Examples 12 to 14 were measured.
  • the method for measuring the drying rate is as follows. (Dry rate measurement) 1. The sample whose original mass (W) is measured is put into a plastic bag with a chuck, impregnated with distilled water which is 700% of W, and left for 24 hours. 2. The sample taken out from the plastic bag is transferred onto a PE sheet having a known mass, and the mass (W0) is measured. 3. The sample is allowed to stand on the PE sheet, and the mass (Wn) is measured and recorded at an arbitrary time (n minutes) up to 360 minutes after placement. n is set to 5, 10, 15, 30, 60, 120, 180, 240, 300, 360. 4).
  • Moisture content [%] (Wn ⁇ W0) / W0 ⁇ 100 5. From the graph, read the time required for the moisture content to decrease to 600%, 500%, 300%, 200%, and 100%.
  • FIG. 6 For each example and each comparative example, a graph showing a decrease in moisture content up to 360 minutes is shown in FIG. 6 and it is necessary for the moisture content to decrease to 600%, 500%, 300%, 200%, and 100%. Table 6 shows the time (minutes) spent.
  • Example 12 regarding the drying speed, when the fineness was the same, the normal rayon showed a slower drying speed than the transparent rayon, and the liquid was held for a longer time.
  • the transparent rayon contained the silicon dioxide so that the proportion of cellulose was small, the liquid retention was slightly inferior, and the drying rate was increased.
  • Comparative Example 12 using the solvent-spun rayon the drying rate was the highest and the ability to retain the absorbed liquid was low.
  • Example 13 A random web having a basis weight of about 45 g / m 2 was prepared using the fiber 11 by a random card machine.
  • the random web was subjected to hydroentanglement treatment to entangle the fibers.
  • hydroentanglement treatment a 3 MPa columnar water stream is sprayed once on one side of the web using a nozzle having pores of 0.13 mm spaced at intervals of 1.0 mm, and a 5 MPa columnar water stream is applied to the other surface.
  • a 5 MPa columnar water flow was injected once more on the surface on which the columnar water flow was previously jetted.
  • the fiber web was subjected to a drying treatment to obtain a nonwoven fabric.
  • the skin color was more transparent compared to the nonwoven fabric of Comparative Example 8 impregnated with water. I saw.
  • the nonwoven fabric of the present invention exhibits high transparency in a wet state, and allows the object to be seen well when attached to the object in a liquid-impregnated state. It is suitably used as a sheet for covering the skin in the impregnated state.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Artificial Filaments (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

　L'invention consiste à : former une bande fibreuse en utilisant de la rayonne viscose dans laquelle une section transversale a de préférence une seule structure, le degré de rugosité de la section transversale telle que calculée à partir de l'équation étant de 2,0 ou moins ; intégrer la bande fibreuse, par exemple, en entrelaçant les fibres constituant la bande fibreuse les unes avec les autres ; et obtenir un tissu non tissé qui devient le matériau de base d'une feuille imprégnée de liquide, la transparence de la feuille imprégnée de liquide dans un état humide étant encore améliorée. Degré de rugosité = L2/(4π・S) (Dans l'équation, L est la circonférence de la section transversale, et S est l'aire de la section transversale).
PCT/JP2015/070978 2014-07-23 2015-07-23 Tissu non tissé pour feuille imprégnée de liquide, feuille imprégnée de liquide, et rayonne viscose pour tissu non tissé pour une feuille imprégnée de liquide WO2016013618A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580039318.3A CN106536803B (zh) 2014-07-23 2015-07-23 液体浸渗片用无纺布、液体浸渗片以及液体浸渗片用无纺布用的粘胶人造丝
JP2016535971A JP6093487B2 (ja) 2014-07-23 2015-07-23 液体含浸シート用不織布、液体含浸シートおよび液体含浸シート用不織布用のビスコースレーヨン

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-149893 2014-07-23
JP2014149893 2014-07-23

Publications (1)

Publication Number Publication Date
WO2016013618A1 true WO2016013618A1 (fr) 2016-01-28

Family

ID=55163142

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/070978 WO2016013618A1 (fr) 2014-07-23 2015-07-23 Tissu non tissé pour feuille imprégnée de liquide, feuille imprégnée de liquide, et rayonne viscose pour tissu non tissé pour une feuille imprégnée de liquide

Country Status (3)

Country Link
JP (1) JP6093487B2 (fr)
CN (1) CN106536803B (fr)
WO (1) WO2016013618A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019170756A (ja) * 2018-03-29 2019-10-10 ダイワボウホールディングス株式会社 液体含浸皮膚被覆シート用不織布および液体含浸皮膚被覆シート
KR20190118176A (ko) * 2017-03-03 2019-10-17 켈하임 피브레스 게엠베하 비스코스 섬유의 용도

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG11202104596YA (en) * 2018-11-22 2021-06-29 Kao Corp Wiping sheet and production method therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS377913B1 (fr) * 1959-11-27 1962-07-11
WO2013187404A1 (fr) * 2012-06-12 2013-12-19 クラレクラフレックス株式会社 Feuille de rétention de liquide et masque facial
JP2014133715A (ja) * 2013-01-10 2014-07-24 Daiwabo Holdings Co Ltd 化粧料含浸用皮膚被覆シートの製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129679A (en) * 1969-11-27 1978-12-12 Courtaulds Limited Multi-limbed regenerated cellulose filaments
CN2557160Y (zh) * 2002-07-15 2003-06-25 上海弘康科技发展有限公司 一种面膜

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS377913B1 (fr) * 1959-11-27 1962-07-11
WO2013187404A1 (fr) * 2012-06-12 2013-12-19 クラレクラフレックス株式会社 Feuille de rétention de liquide et masque facial
JP2014133715A (ja) * 2013-01-10 2014-07-24 Daiwabo Holdings Co Ltd 化粧料含浸用皮膚被覆シートの製造方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190118176A (ko) * 2017-03-03 2019-10-17 켈하임 피브레스 게엠베하 비스코스 섬유의 용도
JP2020513954A (ja) * 2017-03-03 2020-05-21 ケルハイム フィブレス ゲーエムベーハー ビスコース繊維の使用
KR102453654B1 (ko) 2017-03-03 2022-10-12 켈하임 피브레스 게엠베하 비스코스 섬유의 용도
JP2019170756A (ja) * 2018-03-29 2019-10-10 ダイワボウホールディングス株式会社 液体含浸皮膚被覆シート用不織布および液体含浸皮膚被覆シート

Also Published As

Publication number Publication date
JPWO2016013618A1 (ja) 2017-04-27
CN106536803B (zh) 2018-04-17
JP6093487B2 (ja) 2017-03-08
CN106536803A (zh) 2017-03-22

Similar Documents

Publication Publication Date Title
TWI642451B (zh) 保液片料及面膜
ES2429498T3 (es) Material textil laminífero, no tejido, con alto contenido en celulosa
KR102093682B1 (ko) 부직포
EP1189531B1 (fr) Produit de coton hydrophile comportant une face douce et une face grattante
JP6093487B2 (ja) 液体含浸シート用不織布、液体含浸シートおよび液体含浸シート用不織布用のビスコースレーヨン
JP2017150110A (ja) フェイスマスク用セルロース繊維不織布
JP2016037674A (ja) 薬液含浸用シート及びこれを用いたフェイスマスク
JP2013226179A (ja) 化粧用シート
JP2015070968A (ja) フェイスマスク用不織布
JP2009297535A (ja) 化粧用基材及びこれを用いた皮膚洗浄用シート
JP5885961B2 (ja) 扁平レーヨン繊維、その製造方法及びこれを用いた繊維集合体
JP2019201799A (ja) フェイスマスク
KR102453654B1 (ko) 비스코스 섬유의 용도
WO2015154110A1 (fr) Mélanges de fibres colorées et leur utilisation
JP2005120519A (ja) セルロース繊維不織布及びそれを用いた不織布製品
WO2016108285A1 (fr) Agrégat de fibres, objet en forme de feuille absorbant les liquides le comportant, et procédé de fabrication d'agrégat de fibres
TWI746630B (zh) 積層不織布
JP4873836B2 (ja) 化粧用基材及びこれを用いた皮膚洗浄用シート
JP5835578B2 (ja) 不織繊維シートおよびそれからなるワイパー
JP6979580B2 (ja) エアレイド不織布用レーヨン繊維とその製造方法、エアレイド不織布とその製造方法、及び水解紙
JP7475356B2 (ja) 液体塗布用クロス、液体塗布キット、液体塗布シート、および液体塗布用具
WO2016140357A1 (fr) Fil de rayonne destiné à un tissu non tissé formé par voie aérodynamique et son procédé de fabrication, tissu non tissé formé par voie aérodynamique et son procédé de fabrication, et papier hydrolysable
CN111139596B (zh) 一种水刺无纺布
JP7182074B2 (ja) 保液性不織布および該不織布を含有するフェイスマスク
TWI842670B (zh) 透明美容膜及其製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15825565

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2016535971

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15825565

Country of ref document: EP

Kind code of ref document: A1