KR102213970B1 - Liquid-retaining sheet and face mask - Google Patents

Abstract

A liquid retaining sheet is formed from a nonwoven fabric containing 50% by mass or more of highly elastic fibers having a Young's modulus of 30 cN/T or more. The high elastic fiber may be a core sheath type composite fiber. The sheath portion of the core sheath type composite fiber may be formed of an ethylene-vinyl alcohol copolymer, and the core portion may be formed of a hydrophobic resin. The average fineness of the highly elastic fibers may be about 1.5 to 10 dtex. This liquid-retaining sheet is impregnated with a liquid component such as a cosmetic liquid, and even when pressed with a finger, the liquid component is quickly restored and is suitable for a face mask.

Description

Liquid-retention sheet and face mask {LIQUID-RETAINING SHEET AND FACE MASK}

The present invention relates to a liquid-retaining sheet capable of absorbing a liquid component (liquid compound), in particular, to a liquid-retention sheet for a face mask used by impregnating a liquid component containing a cosmetic component or a medicinal component, etc., and affixing it to the skin. .

BACKGROUND ART Conventionally, a skin care sheet (liquid-impregnated biofilm sheet) impregnated with a liquid such as cosmetics has been used as a sheet to be affixed to the human body (skin) or the like. A skin care sheet typified by a face mask has recently been developed a wide variety of products in that it can easily keep the skin in a highly moist state. Among them, the face mask has a function of delivering a cosmetic liquid (cosmetic) impregnated in a sheet constituting the mask to the skin, but for delivery of the cosmetic liquid, the sheet itself needs to be in close contact with the skin. Therefore, in a face mask, various studies are conducted on the sheet itself or its shape in order to bring the sheet into contact with the skin well.

Japanese Patent Application Laid-Open No. 2008-261067 (Patent Document 1) discloses, as a water-containing sheet having good tactile feel, excellent water retention and release properties, and shape stability, solvent-spun cellulose fibers and core sheath having a fiber length of 30 to 60 mm. A non-woven sheet formed by entanglement of type conjugated fibers, wherein the core-sheath type conjugated fiber is made of a sheath and a core, and the sheath is an ethylene-vinyl alcohol-based copolymer, and the core is made of a hydrophobic resin and has a diameter of 5 A sheet of nonwoven fabric having a size of -15 µm is disclosed. Although this document describes a method for producing a core-sheath type conjugate fiber, hot stretching is described, but no specific conditions are described.

However, this nonwoven fabric sheet has excellent flexibility and liquid retention, but the elasticity (stiffness) of the sheet is small, and when the face mask is pressed with a finger in order to adhere to the face, recovery of the thickness and return of the cosmetic liquid (cosmetic) are slow. Therefore, it is difficult to efficiently spread the cosmetic liquid over the entire face. In particular, in the face mask, it is necessary to press the point where the cosmetic liquid is to be replenished or the point where it is difficult to adhere with a finger. Therefore, in the conventional face mask, although the face mask adheres closely to the target site, the replenishment of the cosmetic liquid has been insufficient.

In addition, in order to improve the softness of the face mask to the skin (facial) (to make it possible to adhere to the skin and pour), a face mask formed by placing a layer formed of ultrafine fibers on the contact side of the skin , Face masks having a three-dimensional structure are also being developed. However, even with these face masks, the softness to the skin is not sufficient, and the present condition is that the act of bonding the face mask once affixed with a finger is repeated. Therefore, by repeating the act of pressing against the skin, the cosmetic liquid stored in the pressed portion is extruded (exuded around the pressed portion) each time, resulting in a condition in which the cosmetic liquid is insufficient.

Japanese Patent Laid-Open Publication No. 2008-261067 (Claim 1, Paragraph [0033])

Accordingly, an object of the present invention is to provide a liquid-retaining sheet and a face mask in which liquid components such as a cosmetic liquid (cosmetics) are impregnated with a finger, and the liquid component is quickly restored even when pressed with a finger.

Another object of the present invention is to provide a liquid-retaining sheet and a face mask in which the liquid component is impregnated and the thickness is quickly recovered even when pressed with a finger.

Another object of the present invention is to provide a liquid retentive sheet and a face mask capable of efficiently replenishing a cosmetic liquid to a desired site.

Another object of the present invention is to provide a liquid retaining sheet and a face mask excellent in flexibility, liquid retention, liquid release, and shape stability.

In order to solve the above problems, the inventors of the present invention have studied intensively in order to solve the above problems, and as a result of using a specific highly elastic fiber as a main fiber, a nonwoven fabric capable of absorbing a liquid component was formed, and restoration against compression in the thickness direction of the liquid retention sheet was performed. By controlling, it was found that even if a liquid component such as a cosmetic liquid was impregnated with a finger, it was possible to quickly return the liquid component, and the present invention was completed.

That is, the liquid-retaining sheet of the present invention is formed of a nonwoven fabric containing 50% by mass or more of highly elastic fibers having a Young's modulus of 30 cN/T or more. The high elastic fiber may be a core sheath type composite fiber. The sheath portion of the core sheath type composite fiber may be formed of an ethylene-vinyl alcohol-based copolymer, and the core portion may be formed of a hydrophobic resin. The hydrophobic resin may be a polyester resin. The average fineness of the highly elastic fibers may be about 1.5 to 10 dtex. The high elastic fiber may be a fiber obtained by stretching 2.4 times or more at a temperature of 80°C or higher. The nonwoven fabric may further contain cellulose fibers having an average fineness of 0.3 to 5 dtex. The mass ratio of the highly elastic fibers and the cellulose fibers is about 60/40 to 80/20 of the highly elastic fibers/cellulose fibers. The liquid-retention sheet of the present invention may be a skin care sheet (especially a face mask) impregnated with a liquid component containing a cosmetic. When the liquid retaining sheet of the present invention is impregnated with a cosmetic liquid in 900 mass% of its own weight and a load of 260 g/cm 2 is applied for 1 minute and removed, the restoration against compression in the thickness direction may be 60% or more in 5 minutes.

In the present invention, a nonwoven fabric capable of absorbing a liquid component is formed by using a specific high elastic fiber as the main fiber, and since the restoration against compression in the thickness direction of the liquid-retaining sheet is controlled, a liquid component such as a essence is impregnated. Even when pressed with a finger, the liquid component is quickly restored. In addition, even if the liquid component is impregnated with a finger, the recovery of the thickness (compression elasticity in the thickness direction at the time of impregnation with a cosmetic solution) is also rapid. Therefore, for example, when used as a face mask, a cosmetic solution can be efficiently supplied (applied) to a desired portion of the face. In addition, by using a core-sheath type composite fiber having a sheath formed of an ethylene-vinyl alcohol-based copolymer, it is possible to improve flexibility, liquid retention, liquid release, and shape stability.

In addition, in this specification, the compressive elasticity (compressive elasticity during impregnation) with respect to the thickness direction when the cosmetic solution is impregnated is, after compressing the sheet with a predetermined time and load on a sheet impregnated with the cosmetic solution (after crushing), the load is applied. It is a characteristic (%) showing how much the thickness of the sheet removed and crushed is returned to its original state (the degree of recovery of the compressed sheet thickness).

1 is a schematic diagram for explaining a method of measuring compressive elasticity in a thickness direction at the time of impregnation with a liquid cosmetics in Examples.
Fig. 2 is a schematic diagram for explaining a method of measuring liquid return to a raw material in Examples.

[Non-woven]

The liquid-retaining sheet of the present invention is formed of a nonwoven fabric capable of absorbing liquid components (especially aqueous liquid components). Non-woven fabric is a cosmetic ingredient or a medicinal (effective) ingredient (e.g., a moisturizing ingredient, a cleansing ingredient, a limiting ingredient, a fragrance ingredient, a whitening ingredient, a blood circulation promoting ingredient, a cooling ingredient, an ultraviolet absorbing ingredient, a skin itching suppression ingredient) Etc.) to impregnate a liquid component (liquid compound), which is necessary for impregnating a liquid component (liquid compound), and has pores for liquid retention, and does not cause sagging of the liquid even during handling during use. It holds until it is covered, and has a role of transferring liquid cosmetics little by little to the skin side while applying or standing still. The liquid retention sheet (nonwoven fabric) of the present invention has excellent liquid retention properties, has moderate elasticity or elasticity, and when impregnated with a liquid component, recovery against compression and liquid return are fast, and in particular, the nonwoven fabric has a specific high elastic fiber. When formed with a structure, since the liquid recovery property is excellent and the thickness is quickly recovered, it is possible to recover in a short time in the same liquid holding state as the point where it is not compressed.

Regarding restoration, specifically, when a cosmetic solution was impregnated with 900 mass% of its own weight and a load of 260 g/cm 2 was applied for 1 minute and removed, the restoration against compression in the thickness direction was 60% or more (60 to 100%), preferably about 65 to 99%, more preferably about 70 to 98%. If the restoration is less than 60%, liquid components such as a cosmetic solution cannot be sufficiently returned to the pressurized portion. In addition, restoration to compression can be measured in detail by a method described in Examples to be described later.

Regarding the return of the liquid, specifically, when the cosmetic liquid is impregnated with 900 mass% of its own weight and a load of 620 g is applied to a circular portion with a diameter of 1.2 cm for 1 minute and removed, the liquid return of the cosmetic liquid after 5 minutes is 55%. It may be more than (55-100%), Preferably it is 60-99%, More preferably, it is about 65-98%, More preferably, it is about 70-97%. If the liquid return is too low, the liquid component after pressurization is insufficient, and the face mask cannot sufficiently penetrate the skin. In addition, the liquid return of the cosmetic liquid can be measured in detail by the method described in Examples to be described later.

The nonwoven fabric (retaining sheet) has excellent flexibility when wet, and fibers are properly entangled so that it can follow the skin such as the face, and the stress at 30% elongation when wet according to JIS L 1913 is at least in one direction. In this case, for example, it is about 0.5 to 10 N/5 cm, preferably 1 to 8 N/5 cm, and more preferably about 1.5 to 5 N/5 cm. When the stress at the time of stretching is too small, it is excessively stretched and difficult to handle when attached to the skin such as the face, and when it is too large, the adhesion to the skin decreases. In addition, the stress at 30% elongation in a wet state can be measured in detail by the method described in Examples described later.

The nonwoven fabric (retaining sheet) is also excellent in retention rate, and may have a water retention rate of 800% or more in accordance with JIS L 1907 7.2, for example, 900 to 3000%, preferably 950 to 2000%, more preferably 1000 It is about 1500%. If the water retention rate is too low, it becomes difficult to supply a sufficient amount of a cosmetic (beauty solution) to the skin.

The apparent weight of the nonwoven fabric is, for example, about 30 to 100 g/m 2, preferably 35 to 80 g/m 2, more preferably 40 to 70 g/m 2 (particularly 50 to 65 g/m 2 ). If the apparent weight is too small, it becomes difficult to secure voids for liquid retention formed by the fibers. On the other hand, when it is too large, since the thickness becomes large, the ductility to the skin decreases. In addition, the amount of liquid retentive increases, and most of the effective components do not reach the skin and remain in the liquid retentive layer, and the effective components are easily consumed unnecessarily.

The thickness of the nonwoven fabric can be selected in the range of about 100 to 3000 µm, for example, about 200 to 2000 µm, preferably 300 to 1500 µm, more preferably 400 to 1200 µm (particularly 500 to 1000 µm). to be.

(High elastic fiber)

Since the nonwoven fabric has adequate elasticity or elasticity, it contains high elastic fibers having a Young's modulus (initial tensile resistance) of 30 cN/T or more (eg, about 40 to 500 cN/T) as main fibers. The high elastic fiber may have a Young's modulus of about 30 to 100 cN/T (for example, 30 to 90 cN/T), and preferably 30 to 80 cN/T (for example, 35 to 70 cN/T), More preferably, it is about 40 to 60 cN/T (particularly 45 to 55 cN/T). If the Young's modulus is too low, the elasticity and elasticity of the nonwoven fabric cannot be improved.

The structure of the highly elastic fiber is not particularly limited as long as it has the aforementioned Young's modulus, and for example, it may be a polyester fiber such as polyethylene terephthalate or a polyphenylene sulfide fiber (single-phase fiber) of polyphenylene sulfide. Core-sheath type conjugated fibers are preferred from the viewpoint of being easy to achieve both super-liquid retention and liquid release properties.

In the core sheath type composite fiber, it is preferable that the sheath contains a hydrophilic resin in order to secure wettability and liquid retention properties. The sheath containing hydrophilic resin plays an important role in blowing the liquid into the nonwoven fabric when a liquid such as cosmetic (beauty solution) is added to the retentive sheet, and when using a large amount of cosmetic liquid once blown into the nonwoven fabric. It plays a role in keeping the liquid from sagging when handling it.

Examples of the hydrophilic resin include resins having a hydrophilic group (especially a hydroxyl group) such as a hydroxyl group, a carboxyl group, and a sulfonic acid group in a molecule, but a hydrophilic resin having a hydroxyl group in the monomer unit is preferable, and in particular, a point having a hydroxyl group uniformly in the molecule In this, ethylene-vinyl alcohol-based copolymer is particularly preferred. The ethylene-vinyl alcohol-based copolymer has biocompatibility based on hydrophilicity, non-absorption and thermal conductivity. In addition, the ethylene-vinyl alcohol-based copolymer has not only hydrophilicity, but also moderate lipophilicity, and can improve the adhesion and touch to the skin mixed with oily and water, including sweat and dirt, as well as the liquid retentate of the essence. .

In the ethylene-vinyl alcohol-based copolymer, the content of the ethylene unit (copolymerization ratio) can be selected in the range of about 25 to 70 mol%, and in terms of hydrophilicity and melt spinnability, it may be about 30 to 65 mol%, and the retention resin From the point of being able to maintain hydrophilicity while suppressing melt-spinning troubles caused by deterioration of, for example, it may be about 35 to 60 mol%, preferably 37 to 55 mol%, and more preferably about 40 to 50 mol%. . When the ratio of the ethylene unit is too large, the hydrophilicity decreases, and when it is too small, the melt spinnability decreases and the morphology stability in the wet state decreases.

The degree of saponification of the vinyl alcohol unit may be 80 mol% or more, and from the viewpoint of hydrophilicity and melt spinnability, it is 90 mol% or more (e.g., 90 to 99.99 mol%), preferably 95 mol% or more (for example, 95 to 99.98 mol%), more preferably about 96 to 99.97 mol%. When the degree of saponification is too small, hydrophilicity and heat resistance are deteriorated.

In addition, in order to improve the stability against hot water, the ethylene-vinyl alcohol-based copolymer is usually subjected to crosslinking treatment such as acetalization after fiberization to improve hot water resistance, but in the present invention, it is required to be suitable for skin. Therefore, it is preferable not to perform the crosslinking treatment.

The ethylene-vinyl alcohol-based copolymer may contain other copolymerization units. As the polymerization component for constituting the copolymerization unit, other fatty acid vinyl esters (vinyl propionate, vinyl pivalate, etc.), vinylsilane compounds (vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(β-methoxy-e) Oxy)silane, γ-methacryloxypropylmethoxysilane, etc.), etc. are mentioned. These polymerization components may be used alone or in combination of two or more. Among these, vinylsilane compounds such as vinyl trimethoxysilane and vinyl triethoxysilane are preferable. The proportion of the vinylsilane compound is, for example, about 0.0001 to 0.3 mol% (particularly 0.0002 to 0.2 mol%) with respect to the entire polymerization component.

The viscosity average polymerization degree of the ethylene-vinyl alcohol-based copolymer is, for example, 200 to 2500, preferably 300 to 2000, and more preferably about 400 to 1500.

If the sheath is formed of an ethylene-vinyl alcohol-based copolymer, it has excellent adhesion and feel to the skin, and improves the liquid absorption and retention properties of cosmetics, but since the stiffness is lowered by absorption, the rigidity of the nonwoven fabric is maintained. In order to maintain the desired volume (porosity) and secure water absorption even in the processing step, the core portion is preferably formed of a hydrophobic resin in which rigidity is not lowered by absorption.

As a hydrophobic resin, for example, polyolefin resin, acrylic resin, polyvinyl acetal resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyester resin, polyamide resin, polyurethane resin, etc. And fibers formed from a resin component. These hydrophobic resins can be used alone or in combination of two or more.

Among these hydrophobic resins, resins having a process moisture content of less than 2.0% in a standard state (20°C, 65%RH), for example, polyolefin resins such as polyethylene and polypropylene generally used for nonwoven fabrics, polyethylene terephthalate , Polyester resins such as polybutylene terephthalate, polyethylene naphthalate, polyamide resins such as polyamide 6, polyamide 6,6, polyamide 4,6, polyurethane resins such as polyester polyol type urethane resins , Fibers formed of polyacrylonitrile-based resins, etc. are generally used, and have higher elastic modulus than ethylene-vinyl alcohol-based copolymers, and excellent spinnability with ethylene-vinyl alcohol-based copolymers, polypropylene resins, polyesters A type resin is preferable, and a polyester type resin is particularly preferable because the elastic modulus and dimensional stability at high temperature are high, the shrinkage of the nonwoven fabric can be suppressed, and workability is also excellent.

Examples of the polyester resin include polyalkylene arylate resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, and aliphatic polyester resins such as polylactic acid. These polyester resins can be used alone or in combination of two or more. Among these polyester resins, poly C _2-4 alkylene arylate resins containing 80 mol% or more of C _2-4 alkylene arylate units such as ethylene terephthalate and butylene terephthalate are preferred.

In the core sheath type conjugated fiber, it is preferable that the sheath occupies an area of 50% or more (particularly 90 to 100%) of the fiber surface area continuously in the longitudinal direction, and usually the sheath occupies approximately the entire surface area.

The ratio (mass ratio) of the core and the sheath is, for example, the sheath/deep = 90/10 to 10/90 (eg, 60/40 to 10/90), preferably 80/20 to 15/85, More preferably, it is about 60/40-20/80. If the ratio of the sheath is too large, the core cannot maintain the shape of the fiber, and it becomes difficult to secure the strength of the fiber itself. Further, depending on the diameter of the core, the elasticity of the fibers decreases, the density of the nonwoven fabric increases, and the liquid retention property decreases. If the ratio of the sheath is too small, the hydrophilicity will decrease. Moreover, depending on the diameter of the core, the elasticity becomes too strong, and the flexibility and ductility to the skin decrease.

High elastic fibers are commonly used additives, such as stabilizers (thermal stabilizers such as copper compounds, UV absorbers, light stabilizers, antioxidants, etc.), colorants, dispersants, fine particles, antistatic agents, flame retardants, plasticizers, lubricants, retarding crystallization rate It may contain a pill or the like. These additives can be used alone or in combination of two or more. In particular, in the ethylene-vinyl alcohol-based copolymer of the sheath, in order to suppress thermal deterioration during melt molding, a trace amount of acid (such as fatty acid such as acetic acid) or metal salt (such as alkali metal or alkaline earth metal salt such as phosphoric acid or acetic acid) You may add. These additives may be supported on the fiber surface or may be contained in the fiber.

The cross-sectional shape (cross-sectional shape perpendicular to the longitudinal direction) of the highly elastic fiber is not particularly limited, and for example, an annular cross-section, a deformed cross-section (flat, elliptical cross-section, etc.), a polygonal cross-section, a multi-leaf cross-section (3 to 14) Leaf-shaped cross-section), hollow cross-section, V-shaped cross-section, T-shaped cross-section, H-shaped cross-section, Y-shaped cross-section, I-shaped (dogbone-shaped) cross-section, array-shaped cross-sectional shape, etc. may be used. Among these, shapes without acute angles (protrusions) or grooves, in particular, annular cross-sections (true circular cross-sections, etc.), in that the tactile feel is superior to shapes having acute angles (protrusions) or grooves such as polygonal cross-sections and Y-shaped cross-sections. Is preferably a substantially circular cross section) and an elliptical cross section, and particularly preferably a substantially circular cross section.

The average fineness of the highly elastic fibers is, for example, about 1.5 to 10 dtex, preferably 1.7 to 5 dtex, more preferably 1.8 to 4.5 dtex (particularly 1.9 to 4 dtex). In addition, since the water retention rate is high and characteristics such as recovery of the liquid component are also excellent, the average fineness may be, for example, 1.5 to 5 dtex, preferably 1.6 to 3 dtex, and more preferably 1.7 to 2 dtex. When the highly elastic fiber is too thick, the touch is deteriorated, or the liquid-absorbing property or liquid retention property is easily deteriorated. On the other hand, if it is too thin, the elasticity decreases, so when the nonwoven fabric is pressed with a finger, recovery of the thickness and recovery of the liquid component are delayed. Further, since the density of the nonwoven fabric is increased and the voids between fibers are reduced, the liquid retention property is also reduced.

The fiber length (average fiber length) of the highly elastic fibers is not particularly limited, but, for example, about 20 to 70 mm, preferably 30 to 60 mm, more preferably 45 to 60 mm (particularly 45 to 55 mm) to be. If the fiber length is too long, uniform entanglement between the fibers becomes difficult, the tactile feel is reduced, and the liquid absorbing property and the liquid discharge property are reduced. On the other hand, when the fiber length is too short, the fibers are easily removed from the nonwoven fabric, and flexibility and elasticity are also reduced.

The manufacturing method of the highly elastic fiber is not particularly limited, and a conventional method can be used. High elastic fibers can be produced by, for example, a spinning method through melt kneading extrusion, but in order to impart a high modulus of elasticity to the fibers, it is preferable to perform stretching treatment after spinning. In the present invention, whether it is because the crystallinity of the resin component (e.g., polyester-based resin forming the core portion, etc.) can be improved by stretching treatment at a predetermined heating temperature after spinning. It is possible to improve the rigidity and elasticity of the nonwoven fabric, and to impart the necessary elasticity to the face mask.

In the stretching method, a conventional method can be used. For example, when the fibers discharged from the nozzle during spinning are wound with a straightener roller, a one-step method of stretching between hot iron rollers may be used. It may be a two-step method of hot stretching at a low speed in a hot stove.

The draw ratio may be 2.0 times or more, and specifically, it can be selected in the range of about 2 to 10 times, for example, 2.1 to 8 times, preferably 2.2 to 5 times, more preferably 2.3 to 4 times ( In particular, it is about 2.4 to 3 times). If the draw ratio is too low, the elasticity of the highly elastic fiber cannot be sufficiently improved, and if it is too high, yarn breakage occurs.

The heating temperature in stretching can be selected depending on the type of fiber, for example, even if it is 80°C or higher, preferably 80 to 150°C, more preferably about 85 to 120°C (especially 85 to 100°C). do.

The highly elastic fiber may be subjected to a mechanical crimp applying treatment using a conventional method, for example, a crimp applying device, or may be heated and dried after the treatment. The drying temperature is, for example, about 100 to 150°C, preferably 120 to 150°C, more preferably about 140 to 150°C (particularly 145 to 150°C). By drying at a high temperature in such a range, the elasticity of the high elastic fiber can be further improved.

The proportion of the highly elastic fibers may be 50% by mass or more with respect to the entire nonwoven fabric, for example, 50 to 100% by mass, preferably 60 to 100% by mass, more preferably 65 to 100% by mass (especially 70 to 100 Mass%). In terms of excellent liquid retention properties, rapid recovery of the thickness against compression and liquid return, and excellent balance of liquid retention properties and liquid return properties, the ratio of highly elastic fibers is, for example, 50 to 90 with respect to the entire nonwoven fabric. Mass%, preferably 55 to 85 mass%, more preferably about 60 to 80 mass% (particularly 65 to 75 mass%) may be used. If the proportion of the highly elastic fibers is too small, the elasticity of the nonwoven fabric cannot be improved.

(Other fibers)

The nonwoven fabric may further contain other fibers (low elastic fibers) in addition to the high elastic fibers as long as the rigidity and elasticity are not impaired. As the other fiber, a cellulose fiber is preferable from the viewpoint of improving the liquid-absorbing property and the liquid-retaining property.

The cellulose fibers may be natural fibers (wood pulp, cotton, cotton, hemp, etc.), but regenerated fibers are preferred from the viewpoint of handling properties and the like. Regenerated fibers include regenerated cellulose fibers obtained by the viscose method (viscose rayon, polynosic, etc.), regenerated cellulose fibers obtained by the copper ammonia method (Cupra, etc.), and the solvent spinning method (direct method without chemically converting cellulose once). And the resulting solvent-spun cellulose fiber (lyocell such as Tencel (registered trademark)), and the like. These cellulose fibers can be used alone or in combination of two or more.

Among these cellulose fibers, solvent-spun cellulose fibers are preferred from the viewpoint of having a good touch and excellent fiber strength in a wet state. Further, the solvent-spun cellulose fiber may be a cellulose fiber produced by a method of further stretching a fiber obtained by dry-wet spinning a spinning dope obtained by dissolving cellulose in amine oxide in water to precipitate cellulose. As a representative example of such a solvent-spun cellulose fiber, lyocell is mentioned, and is sold under the brand name of "Tencel" (registered trademark) from Lenzing, Austria.

Solvent-spun cellulose fibers are usually fibrillated by being beaten with a beater, refiner, high-speed mixer, etc., but in the present invention, fine fibers adhere to the skin by fibrillation of the fibers. In order to prevent this, solvent-spun cellulose-based fibers that are not substantially fibrillated are preferred.

Other fibers may also contain commonly used additives, similarly to highly elastic fibers.

The Young's modulus of other fibers is less than 30 cN/T, for example, 1 to 29 cN/T, preferably 5 to 25 cN/T, more preferably 10 to 23 cN/T (especially 15 to 20 cN/ T) about it.

The cross-sectional shape of the other fibers may also be the shape exemplified in the section of the high elastic fiber, but from the viewpoint of excellent tactile feel, like the solvent-spun cellulose fiber, an annular cross-section and an elliptical cross-section are preferable.

The average fineness of other fibers (especially cellulose fibers) is, for example, about 0.3 to 5 dtex, preferably 0.5 to 2 dtex, more preferably 0.6 to 1.7 dtex (particularly 0.8 to 1.5 dtex). If the other fibers are too thick, the touch is deteriorated, or the liquid-absorbing property or liquid-retaining property is easily deteriorated. On the other hand, if it is too thin, the density of the nonwoven fabric increases and the voids between fibers decrease, so that the liquid retention property decreases.

The fiber length (average fiber length) of the other fibers is not particularly limited, but is, for example, about 20 to 70 mm, preferably 30 to 60 mm, and more preferably about 35 to 50 mm. If the fiber length is too long, uniform entanglement between the fibers becomes difficult, the tactile feel is reduced, and the liquid absorbing property and the liquid discharge property are reduced. On the other hand, when the fiber length is too short, the fibers are easily removed from the nonwoven fabric, and flexibility and elasticity are also reduced.

The ratio (mass ratio) of the highly elastic fibers and other fibers (especially cellulose fibers) is, in particular, in terms of excellent balance of liquid retention and liquid return properties, high elastic fibers/other fibers (especially solvent-spun cellulose fibers) = 60/40 to It is preferably 80/20, more preferably about 65/35 to 75/25. If the proportion of highly elastic fibers is too small, the elasticity of the nonwoven fabric is lowered, and if too large, the effect of blending other fibers decreases. For example, if the proportion of cellulose fibers is small, liquid retention or liquid absorption properties will be improved. Can't.

In the present invention, the total ratio of the highly elastic fibers and cellulose fibers may be 50% by mass or more with respect to the entire nonwoven fabric, for example, 80 to 100% by mass, preferably 90 to 100% by mass, more preferably It is about 95 to 100% by mass, and a nonwoven fabric may be formed only from highly elastic fibers and cellulose fibers. In particular, when the liquid-retaining sheet of the present invention is used for a use in contact with the skin, unlike an industrial absorbent sheet that requires dimensional stability, etc., it is preferable that the content of the conventional binder fiber that decreases the touch is small. For example, the proportion of the binder fibers may be 10% by mass or less, preferably 5% by mass or less, and more preferably 1% by mass or less with respect to the entire nonwoven fabric.

[Method of manufacturing nonwoven fabric]

The nonwoven fabric (liquid sheet) can be produced by, for example, a spunlace method, a needle punch method, a steam jet method, or the like. Among these methods, the spunlace method is preferred from the viewpoint of simplicity and the like.

In the spunlace method, staple fibers, for example, high elastic fibers (or mixed cotton of high elastic fibers and other fibers) may be opened by carding using a card machine to produce a nonwoven web. This nonwoven web is a parallel web arranged in the direction of progression of the card machine according to the blending ratio of fibers constituting the web, a cross web in which parallel webs are laid cross-laid, a random web arranged randomly, or an intermediate between a parallel web and a random web. Any of the semi-random webs arranged in such a manner may be used, but since entanglement of fibers occurs in the transverse direction and elongation in the transverse direction is inhibited, the ductility to the skin during use may be lowered than that of random webs or cross webs. , A parallel web and a semi-random web that can ensure the flexibility and extensibility of the laminated sheet in the transverse direction are preferable.

In addition, in the spunlace method, water entanglement treatment is performed on the obtained nonwoven web. In the water entanglement treatment, for example, 1 to 3 rows of injection holes having a diameter of 0.05 to 0.3 mm (especially 0.08 to 0.2 mm) and a spacing of 0.3 to 1.5 mm (especially 0.4 to 1 mm) (especially 1 to 2 rows) The water stream sprayed from the nozzle plates arranged in a column shape collides with the nonwoven web placed on the porous support member, and the fibers constituting the nonwoven web are three-dimensionally entangled with each other to be integrated. When performing three-dimensional entanglement on the nonwoven web, the nonwoven web is placed on the moving porous support member, for example, a hydraulic pressure of 1 to 15 MPa, preferably 2 to 12 MPa, more preferably about 3 to 10 MPa A method of treating once or a plurality of times with a stream of water is preferable. The spray holes are arranged in a row in a direction orthogonal to the traveling direction of the nonwoven fabric, and the nozzle plate in which the spray holes are arranged is the same as the spray hole spacing in a direction perpendicular to the traveling direction of the nonwoven web placed on the porous support member. It is desirable to make the water flow uniformly impinge on the nonwoven web by amplitude at intervals. The porous supporting member on which the nonwoven web is placed is not particularly limited as long as water flow can penetrate the nonwoven web, such as a mesh screen such as a wire mesh or a perforated plate. The distance between the jetting hole and the nonwoven web can be selected depending on the hydraulic pressure, but is, for example, about 1 to 10 cm. Outside of this range, the base of the nonwoven fabric is liable to be disturbed or the three-dimensional entanglement is insufficient.

After performing water entanglement treatment, you may perform drying treatment. As the drying treatment, first, it is preferable to remove excess moisture from the treated nonwoven web, and a known method can be used to remove excess moisture. For example, excess moisture may be removed to some extent using a drawing device such as a mangle roll, and then the remaining moisture may be removed using a drying device such as a suction band type hot air circulation dryer.

[Retention sheet]

The liquid-retaining sheet of the present invention may be a sheet in which a liquid component is impregnated with a nonwoven fabric, for example, a skin care sheet (especially a face mask) in which a liquid component containing a cosmetic (a cosmetic solution) is impregnated with a nonwoven fabric.

The liquid-retaining sheet of the present invention is also used for use by absorbing liquid components, for example, surface materials such as sanitary products and diapers, diaper liners, and sheets for body fluid absorption such as wet tissues (or skin cleaning sheets). However, since it has an excellent balance of liquid retention and release properties, and can easily adhere to the skin, applications in which a sheet impregnated with liquid ingredients such as cosmetic ingredients or medicinal ingredients is in close contact with the skin, for example, a face mask, It is preferable to use for various skin care sheets such as makeup removal sheet or cleansing sheet, body cleaning sheet (sweat towel sheet, oil paper sheet, etc.), cooling sheet, medicinal or therapeutic sheet (itch suppression sheet, poultice, etc.), It is particularly preferable to use it for a face mask because the liquid component is quickly returned even when pressed with a finger.

The liquid-retaining sheet of the present invention may be a sheet used by impregnating these liquid components at the time of use, or may be a sheet used by impregnating the liquid component in advance (so-called wet sheet).

In the present invention, the liquid component includes, in addition to liquid substances such as solvents and liquid oils, solutions or dispersions (cosmetics, emulsions, etc.) in which active ingredients such as cosmetic ingredients or medicinal (effective) ingredients are contained in the liquid substance. . The solvent may be a lipophilic solvent, but a hydrophilic solvent is preferable from the viewpoint of safety to the human body. Examples of the hydrophilic solvent include water, lower aliphatic alcohols (e.g., C _1-4 alkyl alcohols such as ethanol and isopropanol), alkylene glycols (e.g., ethylene glycol, diethylene glycol, propylene Glycol, etc.), etc. are mentioned. These hydrophilic solvents can be used alone or in combination of two or more. Liquid oils include, for example, unsaturated higher fatty acids (e.g., oleic acid, oleyl alcohol, etc.), animal and vegetable oils (e.g. jojoba oil, olive oil, palm oil, camellia oil, macadamia nut oil, avocado oil, corn oil, Sesame oil, wheat germ oil, linseed oil, castor oil, squalane, etc.), mineral oil (e.g. liquid paraffin, polybutene, silicone oil, etc.), synthetic oil (e.g., synthetic ester oil, synthetic poly Ether oil, etc.) etc. are mentioned. These liquid oils can be used alone or in combination of two or more.

These liquid substances may be used alone or in combination of two or more. For example, liquid oil may be used in combination as an additive (oil) with respect to a hydrophilic solvent such as water or ethanol. Among these liquid substances, water, lower alcohols or mixtures thereof are usually used, and water and/or ethanol (especially water) are preferably used. For example, when using a combination of water and lower alcohol (especially ethanol), the ratio (volume ratio) of both is water/lower alcohol = 100/0 to 30/70, preferably 100/0 to 50/50 , More preferably, it is about 100/0 to 70/30, and for example, it may be about 99/1 to 80/20.

Active ingredients include conventional additives, such as physiologically active ingredients (skin emollients, whitening agents, restrictors, anti-roughness agents, anti-inflammatory agents, skin itching inhibitors, blood circulation promoting agents, cell activators, etc.), moisturizing agents, emollients. , Cleansing agents, ultraviolet absorbers, surfactants, astringents, enzymes, refreshing agents, fungicides or antibacterial agents, antioxidants, amino acids, coolants, fragrances, coloring agents, and the like. These additives can be used alone or in combination of two or more. Among these additives, for the skin care sheet, for example, a moisturizing agent, an ultraviolet absorber, a surfactant, a refreshing agent, an enzyme, an astringent agent, a bactericide, or an antibacterial agent are generally used. In particular, in a face mask (face pack), for example, a moisturizing agent or an emollient agent may be blended in a hydrophilic solvent. As a moisturizing agent or emollient agent, for example, dipropylene glycol, 1,3-butylene glycol, polyethylene glycol, polyoxyethylene-polyoxypropylene block copolymer, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sucrose Fatty acid ester, glycerin, sodium hyaluronate, polyoxymethyl glycoside, polyvinyl alcohol, polyvinylpyrrolidone, water-soluble cellulose ether (methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethylmethylcellulose, hydride Hydroxypropylmethylcellulose, etc.), etc. are mentioned. The total ratio of the moisturizing agent and the emollient agent is, for example, about 0.1 to 50 mass%, preferably 1 to 30 mass%, and more preferably about 5 to 20 mass% in the solution.

The proportion of these additives can be appropriately selected depending on the application. For example, the proportion of liquid substances such as water or ethanol is usually 30 to 99% by mass, preferably 40 to 99% by mass of the total liquid component including the additive. It is 95 mass%, more preferably about 50 to 90 mass%.

Since the liquid-retaining sheet of the present invention is excellent in adhesion to the skin, it is particularly suitable as a sheet to be fixed to the skin such as a face mask or a wet cloth. For example, since a floating portion without close contact can be easily corrected, the sheet can be in close contact with even fine gaps (corrugations) such as around the nose, and the active ingredients of the face mask can effectively penetrate the skin.

The liquid-retaining sheet of the present invention is also suitable for a cleansing sheet or a skin washing sheet. That is, since the liquid-retaining sheet of the present invention can make the sheet in close contact with even the fine gaps of the face, make-up (makeup cosmetics such as foundation, powder, lipstick, eye makeup, etc.) can be effectively removed.

As described above, when the liquid-retaining sheet of the present invention is used as a liquid-impregnated biological film sheet (such as a face mask), a liquid component is usually impregnated with the liquid-retaining sheet, and affixed or contacted with the skin of a living body.

The liquid-retaining sheet of the present invention may be laminated with another layer. For example, in order to promote absorption of the active ingredient, a non-porous film or sheet may be laminated on the side not in contact with the skin.

Example

Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to the following examples at all. In addition, each physical property value in the following Examples and Comparative Examples was measured or evaluated by the following method. In addition, the details of the fibers used in the following Examples and Comparative Examples are as follows.

[Melt viscosity (Pa·s)]

Using a melt viscometer, after preheating for 10 minutes at a temperature of 290°C, the melted thermoplastic resin was extruded from a nozzle to perform measurement.

[MI (melt index) (g/10 min)]

In a cylindrical container heated by a heater, a certain amount of synthetic resin (2160 g) was heated and pressurized at a predetermined temperature (190°C), and the amount of resin extruded per 10 minutes was measured from an opening (nozzle) formed in the bottom of the container. .

[Fiber fineness (dtex)]

Five sets of 30 samples of 30 single yarns cut into 30 mm were prepared, and the weight of each sample was measured twice.

Fineness (dtex) = weight (g) / (number of 30 pieces × fiber length 30 mm) × 10000 m.

[Apparent weight (g/㎡)]

According to JIS L 1906, after leaving the sample to stand for 24 hours in the standard state of temperature 20 degreeC and 65% humidity, the sample of 1 m in width direction x 1 m in length direction is taken, and the weight (g) is measured using a balance. . The decimal point of the obtained weight (g) was rounded off, and it was set as the apparent weight.

[Thickness (mm)]

Using a razor (“Feather Razor Blade S One Blade” manufactured by Feather Safety Body Co., Ltd.), the sample is cut perpendicular to the surface in the MD direction, and a digital microscope (DIGITAL MICROSCOPE manufactured by KEYENCE Co., Ltd.) ) VHX-900] to observe the cross section of the sample and measure the thickness.

[Compressive elasticity in the thickness direction when impregnated with a non-solvent (compressive elasticity when impregnated) (%)]

A sample cut into 5 cm in the MD direction x 5 cm in the CD direction was prepared, and 900% of the cosmetic liquid (Kanebo Cosmetics Co., Ltd. product "Fresh Essence Lotion NA") was impregnated with respect to the sample weight, as shown in FIG. Similarly, the sample 3 was spread out on the acrylic plate (measurement table) 4 and allowed to stand, and the initial thickness was measured with the laser displacement meter 1. Next, a load 2 of 260 g/cm 2 was placed in the center of the original fabric (nonwoven fabric) for 60 seconds, and the displacement from immediately after removal of the load to 300 seconds later was measured. When the thickness of the fabric before measurement is A, the thickness immediately after the load is removed is B, and the thickness after 300 seconds after the load is removed is C, the compressive elasticity (%) in the thickness direction at the time of impregnation of the essence is calculated according to the following equation. I did.

Compressive elasticity (%) in the thickness direction at the time of impregnation with a liquid cosmetics = [(C-B)/(A-B)] × 100.

[Reward rate (%)]

It was measured according to JIS L 1907 7.2 water absorption. The test piece is cut into 5 cm in width and length, and the weight is measured (Ag). The test piece was immersed in water for 30 seconds. After immersion, one side of the test piece was picked up, taken out from the liquid, and the weight (Bg) after 1 minute was measured. The liquid retention rate (C%) is calculated by the following formula.

C (%) = [(B-A)/A] × 100.

[Return to fabric (%)]

A sample cut into 5 cm in the MD direction x 5 cm in the CD direction was prepared, and 900% of the cosmetic liquid (Kanebo Cosmetics Co., Ltd. product "Fresh Essence Lotion NA") was impregnated with respect to the sample weight, as shown in FIG. Similarly, the sample 13 was spread and left on the acrylic plate (measurement table) 14, and a load 12 of 620 g was placed in the center of the circular shape with a diameter of 1.2 cm for 60 seconds, and the liquid cosmetics immediately after removing the load The width of the missing part was measured. In addition, the width of the portion without the serum after 300 seconds from which the load was removed was measured. When the width of the part without the cosmetic liquid immediately after the load was removed was A, and the width of the part without the cosmetic liquid 300 seconds after the load was removed was B, the liquid return to the fabric (%) was determined according to the following equation.

Return to fabric (%) = [(A-B)/A] × 100.

[Stress at 30% elongation when wet (N/5 cm)]

It measured according to the method described in JIS L 1913 (general single fiber nonwoven fabric) 6.3.2 (Tensile strength and elongation at wet test). Specifically, the sample is placed in water at 20°C ± 2°C until it settles with its own weight, or after being immersed in water for at least 1 hour, taken out from the immersion liquid and quickly measured at 30% elongation stress (WET stress). I did.

[Method of manufacturing core sheath composite fiber]

(Core sheath composite fiber A)

An ethylene-vinyl alcohol-based copolymer ("Evar" manufactured by Kuraray Co., Ltd.) having an ethylene content of 44 mol% and an MI value of 12 g/10 minutes was added to the super component, and the core component had a melt viscosity of 12000 [ Pa·s] of polyester chips (polyethylene terephthalate, manufactured by Kuraray Co., Ltd., intrinsic viscosity = 0.61), using a composite melt-spinning device, under conditions of a temperature of 290°C, with a ring cross-section, and a composite The ratio (deep part/shear part) = 50/50 (weight ratio) was bonded to a core sheath type, and discharged. After the discharged yarn was cooled and solidified, it was wound on a bobbin at a speed of 1000 m/min through a take-up roller to obtain a 5.3 dtex wound yarn. Subsequently, this wound yarn was hot stretched at a drawing temperature of 90° C. at a draw ratio of 2.8 times, and an oil agent was applied with an oil bath, and then mechanical crimp application treatment was performed. The mechanical crimp application treatment was performed using a conventional stepper type crimp application device. Following the crimping treatment, the fibers were dried with hot air at 150°C, and then cut to 51 mm to obtain a single yarn fineness of 1.9 dtex, a number of crimps of 23 pieces/25 mm, and a Young's modulus of 51.0 cN/T short fibers (core sheath composite fiber A). Got it. Both spinnability and stretchability were good.

(Core sheath composite fiber B)

In the same manner as the manufacturing method of core sheath conjugate fiber A, except that the draw ratio is 2.4 times and the drying temperature by hot air is 150°C, the single yarn fineness is 1.9 dtex, the fiber length is 51 mm, the number of crimps is 23/25 mm, and the Young's modulus is 40.1. The core sheath composite fiber B of cN/T was obtained.

(Core sheath composite fiber C)

In the same manner as the manufacturing method of core sheath conjugate fiber A, except that the draw ratio is 2.5 times and the drying temperature by hot air is 140°C, single yarn fineness is 1.9 dtex, fiber length 51 mm, number of crimps 23/25 mm, Young's modulus 30.8 The core sheath composite fiber C of cN/T was obtained.

(Core sheath composite fiber D)

In the same manner as in the manufacturing method of core sheath conjugate fiber A, except that the draw ratio is 2.3 times and the drying temperature by hot air is 140°C, single yarn fineness is 1.9 dtex, fiber length 51 mm, number of crimps 23/25 mm, Young's modulus 23.3 The core sheath composite fiber D of cN/T was obtained.

[Used fiber]

Tencel fiber: "TENCEL" manufactured by LENZING, fineness 1.7 dtex, average fiber length 38 mm, Young's modulus 19.2 cN/T

Rayon fiber: Omicenshi Co., Ltd. "Hope", fineness 1.7 dtex, average fiber length 38 mm, Young's modulus 13.3 cN/T

Polyphenylene sulfide (PPS) fiber: "Procon" manufactured by Toyobo, 2.2 dtex, Young's modulus 441.0 cN/T

PET fiber: manufactured by Toray Corporation, fineness 1.7 dtex, average fiber length 51 mm, Young's modulus 29.8 cN/T

Cotton fiber: Marusan Industrial Co., Ltd., fineness 1.6 dtex, Young's modulus 12.8 cN/T.

Examples 1 to 7 and Comparative Examples 1 to 4

The fibers shown in Table 1 were blended (in the case of using a single fiber, not blended), and a card web was produced. Subsequently, water flow was jetted to this card web, entanglement treatment was performed, and water entanglement nonwoven fabric was obtained. In the water entanglement treatment, a nozzle having an orifice having a diameter of 0.1 mm was formed at intervals of 0.6 mm in the width direction of the web, and a water pressure of 3 to 5 MPa was injected in two steps at each of the front and back to interlock.

Table 1 shows the evaluation results of the nonwoven fabrics obtained in Examples and Comparative Examples.

As is clear from the results of Table 1, in the nonwoven fabric of Example, the water retention rate was high, and both the compression elasticity (compression elasticity during impregnation) and return to the thickness direction when impregnated with a liquid cosmetics were fast, whereas in the nonwoven fabric of the comparative example, compression during impregnation The elasticity and return are slow. In particular, in Comparative Examples, regardless of the ratio of compressive elasticity during impregnation, the liquid return to the fabric is constant with a low liquid return of about 50%, whereas in Examples, the liquid to the fabric is proportional to the compressive elasticity during impregnation. The return is also improved, and in particular, in the nonwoven fabric containing 70 mass% or more of the core sheath conjugated fiber A having a high Young's modulus, the liquid return to the high fabric exceeding 80% is exhibited.

Reference Examples 1 to 12

In order to further clarify the relationship between the compressive elasticity during impregnation and liquid return in Comparative Examples 1 to 4, the fibers shown in Table 2 were mixed (in the case of using a single fiber, not mixed), and compression elasticity during various impregnations. The nonwoven fabric having a was prepared in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 4. In addition, Comparative Examples 1-4 are Reference Examples 6, 1, 2, and 10, respectively.

As is clear from the results in Table 2, in the nonwoven fabric of the reference example, although the compressive elasticity at the time of impregnation spans a wide range of 3.6% to 56.7%, return to the fabric is at a low level of about 40-50%. It is set. This tendency indicates that it is difficult to control the liquid return speed in a predetermined range of compressive elasticity during impregnation.

On the other hand, as is clear from the results of Table 1, in the examples, the compressive elasticity during impregnation exceeds 60%, the return of the liquid to the fabric is improved while the compressive elasticity during impregnation is improved, and the compressive elasticity during impregnation is 75%. If it exceeds, the liquid return to the fabric reaches 80% or more.

That is, as is clear from the results of Tables 1 and 2, in the present invention, the nonwoven fabric is formed of a high elastic fiber in a predetermined ratio, and the compressive elasticity at the time of impregnation can be adjusted to a predetermined level or higher. Although it has succeeded in dramatically improving the material, the effect of this example is a remarkable effect that cannot be predicted from the conventional nonwoven fabric containing low elastic fibers.

Industrial availability

The liquid-retaining sheet of the present invention is used for absorbing liquid components and contacting the skin, for example, a sheet for absorbing body fluids (for example, surface materials such as sanitary products and diapers, diaper liners, wet tissues, etc.), skin care. Sheets (for example, face masks, makeup removal sheets, cleansing sheets, or body cleaning sheets (sweat towel sheets, oil paper sheets, cooling sheets, etc.), medicinal sheets (itch suppression sheets, wet cloths, etc.) can be used. In particular, The liquid component of the present invention is impregnated with a liquid component such as a beauty liquid (cosmetic), and the liquid component is quickly restored even when pressed with a finger. Therefore, it is possible to moisturize the entire face, nose, eyes, lips, neck, etc. Useful for face masks impregnated with potent ingredients.

1: laser displacement meter
2, 12: load
3, 13: sample
4, 14: measuring table

Claims (10)

A liquid-retaining sheet formed of a nonwoven fabric containing 50% by mass or more of high elastic fibers having a Young's modulus of 30 cN/T or more.When a cosmetic solution is impregnated with 900% by mass with respect to its own weight, a load of 260 g/cm2 is applied for 1 minute and removed. The liquid-retaining sheet in which the restoration to compression is 60% or more in 5 minutes. The method of claim 1,
The high elastic fiber is a core-sheath type composite fiber, a liquid-retaining sheet. The method of claim 2,
A liquid-retaining sheet in which the sheath of the core-sheath type composite fiber is formed of an ethylene-vinyl alcohol-based copolymer, and the core portion is formed of a hydrophobic resin. The method of claim 3,
The liquid-retaining sheet in which the hydrophobic resin is a polyester resin. The method according to any one of claims 1 to 4,
A liquid-retaining sheet having an average fineness of 1.5 to 10 dtex of high elastic fibers. The method according to any one of claims 1 to 4,
The liquid-retaining sheet, wherein the highly elastic fibers are fibers obtained by stretching 2.0 times or more at a temperature of 80°C or higher. The method according to any one of claims 1 to 4,
The liquid-retaining sheet, further comprising cellulose fibers having an average fineness of 0.3 to 5 dtex, and having a mass ratio of high elastic fibers and cellulose fibers = 60/40 to 80/20 of high elastic fibers/cellulose fibers. The method according to any one of claims 1 to 4,
A liquid-retention sheet, a skin care sheet impregnated with liquid ingredients including cosmetics. The method according to any one of claims 1 to 4,
A face mask, a rejuvenating sheet. delete

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