JP6726424B2 - Non-woven fabric for liquid-impregnated skin covering sheet and liquid-impregnated skin covering sheet - Google Patents

Description

The present invention relates to a non-woven fabric constituting a liquid-impregnated skin covering sheet impregnated with a liquid, in particular a cosmetic, and a liquid-impregnated skin covering sheet using the non-woven fabric.

Various sheets impregnated with a liquid, which are used for covering the skin of the human body and applying a predetermined substance to the skin of the human body, have been proposed and put into practical use. Specific examples thereof include a liquid-impregnated skin covering sheet (a keratin care sheet used for face masks, heels, elbows, knees, etc.) impregnated with a liquid containing active ingredients (for example, cosmetics). Nonwoven fabric is generally used as the base material of the liquid-impregnated skin covering sheet. Since the liquid-impregnated skin-covering sheet is often used by being brought into close contact with the skin for a relatively long time, various non-woven fabrics have been proposed as a base material from the viewpoints of adhesion, liquid release property, touch feeling, convenience and the like. ing.

For example, Patent Document 1 is a laminated nonwoven fabric in which at least two layers of an ultrafine synthetic fiber layer and a hydrophilic fiber layer are laminated, and the hydrophilic layer of the laminated nonwoven fabric can be used by bringing the hydrophilic layer into contact with the body. Is proposed. According to Patent Document 1, this nonwoven fabric is said to provide a beauty sheet capable of suppressing evaporation of the impregnated beauty drug solution and maintaining a moisturizing effect for a long time. Patent Document 2 includes a first fiber layer containing 50% by mass or more of a three-dimensional crimped fiber having a three-dimensional crimp, and a second fiber layer containing a hydrophilic fiber, and the first fiber layer is one of the second fiber layers. The first fiber layer and the second fiber layer are integrated by entanglement of the fibers, and the three-dimensional crimp is such that the first fiber layer and the second fiber layer are A laminated non-woven fabric, which is formed by the occurrence of crimps in latently crimpable fibers after being entangled and integrated, and the surface of the non-woven fabric is substantially flat and has substantially no pores. A liquid-impregnated skin cover sheet is proposed, which comprises:

JP, 2005-124916, A JP, 2007-212371, A

In one aspect of the present invention, a liquid-impregnated skin-covering sheet in which an impregnated liquid easily stays on the skin and the adhesion effect and moisturizing effect of the liquid are more exerted, or an active ingredient contained in the liquid is easily transferred to the skin An object of the present invention is to provide a non-woven fabric. Another object of the present invention is to provide a liquid-impregnated skin covering sheet, particularly a face mask, in which the nonwoven fabric is impregnated with a liquid.

In the first aspect, the present invention includes a first fiber layer containing 50% by mass or more of hydrophilic fibers, and 50% by mass or more of hydrophobic fibers that are more hydrophobic than the hydrophilic fibers contained in the first fiber layer. A nonwoven fabric comprising a second fiber layer, the first fiber layer forming one surface and the second fiber layer forming the other surface,
The hydrophobic fiber has a fineness of 1.2 dtex or more,
The hydrophobic fiber includes two or more types of fibers having a difference in hydrophobicity,
Provided is a nonwoven fabric for a liquid-impregnated skin covering sheet, which is used by bringing the first fiber layer into contact with the skin.

In the second aspect, the present invention includes a first fiber layer containing 50% by mass or more of hydrophilic fibers and 50% by mass or more of hydrophobic fibers which are more hydrophobic than the hydrophilic fibers contained in the first fiber layer. A nonwoven fabric comprising a second fiber layer, the first fiber layer forming one surface and the second fiber layer forming the other surface,
The hydrophobic fiber has a fineness of 1.2 dtex or more,
The hydrophobic fibers include two or more kinds of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface,
The fibers are heat-bonded to each other by a synthetic fiber contained in the second fiber layer and having a lowest melting point of the thermoplastic resin constituting the fiber surface,
Provided is a nonwoven fabric for a liquid-impregnated skin covering sheet, which is used by bringing the first fiber layer into contact with the skin.

The present invention provides the liquid-impregnated skin-covering sheet according to the third aspect, wherein the nonwoven fabric according to the first or second aspect is impregnated with a liquid in an amount of 600 parts by mass or more and 2500 parts by mass or less.
In a fourth aspect, the present invention provides a face mask in which the above-mentioned nonwoven fabric is impregnated with a liquid in an amount of 600 parts by mass or more and 2500 parts by mass or less.

The nonwoven fabric of the present invention, when the skin is covered with the liquid impregnated with the liquid, the impregnated liquid is likely to stay on the skin, and the adhesive effect and the moisturizing effect of the liquid are more exerted, or the liquid is included in the liquid. A liquid-impregnated skin cover sheet is provided, in which the active ingredient is more easily transferred to the skin.

(Background of the invention)
Patent Document 1 proposes to use, as the ultrafine synthetic fibers, fibers obtained by meltblown fibers, spunbond fibers, and split type fibers. Of these, meltblown fibers and spunbond fibers are used in the form of meltblown nonwoven fabric and spunbonded nonwoven fabric, respectively, and even when these nonwoven fabrics are laminated with a hydrophilic fiber layer and subjected to hydroentangling treatment, hydrophilic fibers are obtained. The layers are unlikely to be entangled, and delamination is likely to occur in the resulting laminated nonwoven fabric. Further, the melt blown nonwoven fabric and the spunbonded nonwoven fabric of ultrafine synthetic fibers have a small specific volume (bulk), and the amount of the liquid which they themselves can hold is likely to be small. Therefore, when a nonwoven fabric using these is impregnated with a liquid, the weight of the liquid-impregnated ultrafine synthetic fiber layer becomes small, and the force to press the hydrophilic fiber layer becomes weak, so that the liquid in the hydrophilic fiber layer is removed. It was found that it is difficult to transfer to the skin or that the adhesion to the skin tends to be reduced.

An ultrafine fiber layer containing ultrafine fibers obtained by splittable fibers has a larger specific volume than a melt blown nonwoven fabric, and a sheet obtained by impregnating a nonwoven fabric with this with a liquid transfers the liquid to the skin. It is easy and has high adhesion to the skin. However, the ultrafine fiber layer containing the ultrafine fibers obtained by the splittable fiber is stored, for example, in a state of being wound in a roll, or as a liquid-impregnated skin-covering sheet, and then laminated into a packaging bag in a state in which a plurality of sheets are laminated. When stored and stored, the thickness is reduced, and thus the specific volume is likely to be reduced. Therefore, the liquid-impregnated skin-covering sheet containing the ultrafine fiber layer also tends to show the same tendency as the sheet containing the meltblown nonwoven fabric.

The inventors of the present invention further promote the transfer of liquid to the skin, ensure the adhesion to the skin by the liquid positioned between the sheet and the skin, and improve the action of the liquid on the skin (for example, moisturizing). The composition of a liquid-impregnated skin covering sheet that can exhibit better performance was examined. As a result, when the hydrophilic fiber layer is the side that comes into contact with the skin, the fiber layer on the side that does not come into contact with the skin is composed of hydrophobic fibers with a fineness of 1.2 dtex or more, and the degree of hydrophobicity of the hydrophobic fibers is Liquid-impregnated skin in which the transfer of liquid to the skin is further promoted by using different ones or by using, as the hydrophobic fiber, two or more kinds of synthetic fibers having different melting points of the thermoplastic resin constituting the fiber surface. The inventors have found that a covering sheet can be obtained, and have devised the present invention.

The non-woven fabric for a liquid-impregnated skin-covering sheet (hereinafter, also simply referred to as “sheet”) of the present invention has a first fiber layer containing 50% by mass or more of hydrophilic fibers and a hydrophilic fiber contained in the first fiber layer. A second fiber layer containing 50% by mass or more of hydrophobic hydrophobic fiber, wherein the hydrophobic fiber contained in the second fiber layer has a fineness of 1.2 dtex or more, and the second fiber layer is a hydrophobic fiber. As, it contains two or more specific types of fibers. Hereinafter, the structure of each fiber layer will be described first.

(First fiber layer)
The first fiber layer contains 50% by mass or more of the hydrophilic fiber layer. The first fiber layer containing hydrophilic fibers holds a liquid (for example, a liquid cosmetic material) that is impregnated into the nonwoven fabric and supplies the held liquid to an object (specifically, skin).
The hydrophilic fiber is a fiber having an official moisture regain of 5% or more. The official moisture regain is shown in JIS L0105 (2006). If the official moisture content is not known, the value calculated from the following formula is used as the official moisture content.
Official moisture regain (%) = [(W-W')/W'] x 100
Here, W means the mass (g) of the fiber under the environment of the temperature of 20° C. and the humidity of 65% RH, and W′ means the mass (g) of the fiber when completely dried. In addition, the mass of the fiber in the environment of the temperature of 20° C. and the humidity of 65% RH means the mass when the fiber is left in the environment of the temperature of 20° C. and the humidity of 65% RH and becomes a constant mass. The mass at the time of absolutely drying means the mass when the fiber has been left in a dryer set at 105° C. and has a constant mass.

Hydrophilic fibers include, specifically, natural fibers such as pulp, cotton, hemp, silk, and wool, regenerated fibers such as viscose rayon, cupra, and solvent-spun cellulose fibers, and synthetic fibers having hydrophilicity, or For example, hydrophobic synthetic fibers (synthetic fibers having an official moisture regain of less than 5%) that have been subjected to a hydrophilization treatment and the like. 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 hydrophilic fibers are preferably cellulosic fibers. More specifically, the cellulosic fibers include 1) pulps such as mechanical pulp, recycled pulp and chemical pulp, 2) vegetable natural fibers such as cotton and hemp, and 3) viscose rayon, cupra, and Regenerated fibers such as solvent-spun cellulosic fibers (for example, Lenzing Lyocell (registered trademark) and Tencel (registered trademark)).

Among the natural plant fibers, cotton has a long history of use as a natural material, is widely used as a material for clothes and sanitary materials, and has the general impression that it is gentle on the skin, has a good feel to the touch, and is safe. Give to consumers. Therefore, the use of cotton can provide a product that is more acceptable to the consumer. When cotton is used, any cotton commonly used in the production of nonwoven fabrics can be used. Specifically, cotton having a fiber length (average fiber length) of about 20 to 60 mm can be used. Multiple cottons of different fiber lengths and types may be used.

Among the recycled fibers, viscose rayon is preferably used because it has a track record of being used in the field of cosmetic puffs and wet sheets that come into contact with human skin, and is relatively inexpensive and easy to obtain.

The fineness of the hydrophilic fiber is preferably about 0.1 dtex to 6 dtex, more preferably about 0.3 dtex to 3.5 dtex, further preferably 0.5 to 2.5 dtex, and 0.8. Most preferably, it is ˜1.8 dtex. Hydrophilic fibers having a fineness within this range are suitable for ensuring flexibility. When the fineness of the hydrophilic fiber is too small, the card passing property during the production of the fibrous web may be deteriorated and the productivity of the nonwoven fabric may be reduced. When the fineness of the hydrophilic fiber is too large, the nonwoven fabric becomes rough and the touch may be deteriorated. If the fineness of the hydrophilic fiber is too large, the spacing between the fibers and the voids in the first fiber layer become large, the ability of the first fiber layer to retain the liquid decreases, the impregnation amount of the liquid decreases, and At times, a liquid (for example, cosmetics or liquid medicine) drips downward, so-called liquid dripping may occur and the usability may deteriorate.

The first fiber layer contains 50% by mass or more of hydrophilic fibers, preferably 70% by mass or more, and more preferably 90% by mass or more. The first fiber layer may be composed of only hydrophilic fibers. When the ratio of the hydrophilic fibers is small, the ability of the first fiber layer to retain the liquid becomes small, and it becomes impossible to impregnate the sheet with a predetermined amount of liquid, or the property of the liquid migrating to the skin (hereinafter referred to as “liquid”). (Also referred to as “migration”) may be inadequate, or the skin may not be supplied with a sufficient amount of liquid. When the first fiber layer contains fibers other than hydrophilic fibers, the other fibers may be hydrophobic fibers. The hydrophobic fibers are described below in connection with the second fiber layer. As the other fiber, one kind of hydrophobic fiber may be used, or two or more kinds of hydrophobic fiber may be used.

The fiber length of the fibers forming the first fiber layer is appropriately selected according to the form of the first fiber layer. For example, when the first fiber layer is produced as a card web, the fiber length of the constituent fibers is preferably 25 mm or more and 100 mm or less, more preferably 30 mm or more and 70 mm or less, and 36 mm or more and 65 mm or less. Is more preferable. When the first fiber layer is produced as an air-laid web, the fiber length of the constituent fibers is preferably 1 mm or more and 50 mm or less, more preferably 5 mm or more and 30 mm or less. When the first fiber layer is produced as a wet papermaking web, the fiber length of the constituent fibers is preferably 0.5 mm or more and 20 mm or less, more preferably 1 mm or more and 10 mm or less.

The first fiber layer may have only one layer (single-layer structure) or may have a laminated structure in which two or more layers are laminated. For example, the first fiber layer may be composed of a layer containing 50% by mass or more of cotton and a layer containing pulp (for example, a tissue). When the layer containing pulp is included in the first fiber layer, it is preferable that the layer containing pulp is located inside and does not form the surface of the nonwoven fabric. This is because pulp has a short fiber length and easily falls off.

The basis weight of the first fiber layer is appropriately selected according to the basis weight of the nonwoven fabric to be finally obtained. Basis weight of the first fiber layer is preferably ^{20g / m 2 ~80g / m 2} , more preferably from ^{25g / m 2 ~60g / m 2} , further preferably 30g / m ² ~50g / m ² There, most preferably ^{35g / m 2 ~45g / m 2} . In addition, the ratio of the basis weight of the first fiber layer to the basis weight of the second fiber layer (the basis weight of the first fiber layer/the basis weight of the second fiber layer) is preferably 0.5 to 16, and more preferably 0.8 to 6. 0.0, more preferably 1.2 to 4.0, most preferably 1.4 to 3.0.

When the basis weight of the first fiber layer is too small, or the ratio of the basis weight of the first fiber layer to the basis weight of the second fiber layer is too small, the amount of liquid retained by the entire liquid-impregnated skin covering sheet is small, and the liquid transferability is low. May be insufficient, or the amount of liquid itself supplied to the skin may be reduced. If the basis weight of the first fiber layer is large or the ratio of the basis weight of the first fiber layer to the basis weight of the second fiber layer is too large, the proportion of the second fiber layer in the entire nonwoven fabric becomes small, and the sheet liquid transferability is reduced. May be insufficient. If the basis weight of the first fiber layer is too large, or the ratio of the basis weight of the first fiber layer to the basis weight of the second fiber layer is too large, the entire nonwoven fabric impregnated with the liquid may become too soft. Therefore, for example, when sheets impregnated with a liquid are stacked, it becomes difficult to remove only one sheet and take it out, or when a sheet impregnated with a liquid is folded with the first fiber layer inside. It may be difficult to open the sheet and the usability may be reduced.

(Second fiber layer)
The second fiber layer contains two types of hydrophobic fibers having a specific fineness. The hydrophobic fibers contained in the second fiber layer have higher hydrophobicity than the hydrophilic fibers contained in the first fiber layer, and therefore the second fiber layer has a stronger hydrophobicity than the first fiber layer. Shows sex. Therefore, when the sheet of the present invention is impregnated with a liquid and the skin is covered with the sheet so that the first fibrous layer is in contact with the skin, the second fibrous layer is a liquid having a stronger hydrophilicity than the first fibrous layer. The liquid that has moved to the side is promoted, and the liquid that has moved to the side of the first fiber layer is further transferred to the skin. Further, in the nonwoven fabric of the present invention, the second fiber layer has bulkiness because it contains hydrophobic fibers having a specific fineness, and when a force is applied in the thickness direction and when impregnated with a liquid. However, it is possible to relatively maintain the voids between the fibers in the layer. Since the voids between the fibers are the portions that retain the liquid, the greater the proportion of the voids, the more liquid the second fiber layer can retain. Therefore, when the sheet of the present invention is impregnated with a liquid, the weight of the liquid held in the bulky second fiber layer pushes the first fiber layer toward the skin, which also causes the liquid to come into contact with the skin. It is estimated that the transition will be further promoted.

The hydrophobic fiber contained in the second fiber layer is, for example, a fiber made of a thermoplastic resin or a hydrophilic fiber subjected to a treatment for imparting hydrophobicity (hydrophobization treatment) to the surface thereof. The thermoplastic resin is not particularly limited, and examples thereof include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate and copolymers thereof, polypropylene, polyethylene ( High density polyethylene, low density polyethylene, linear low density polyethylene and the like), polybutene-1, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer and other polyolefin resins, nylon 6, nylon 12 and It is optionally selected from polyamide resins such as nylon 66, acrylic resins, polycarbonates, polyacetals, engineering plastics such as polystyrene and cyclic polyolefins, and their elastomeric systems. The fiber in which the surface of the hydrophilic fiber is hydrophobized is, for example, the surface of regenerated fiber treated with a hydrophobizing agent.

The hydrophobic fiber contained in the second fiber layer has a fineness of 1.2 dtex or more, preferably 1.2 dtex or more and 3.5 dtex or less, more preferably 1.2 dtex or more and 2.6 dtex or less, The fineness is more preferably 1.3 dtex or more and 2.0 dtex or less, and particularly preferably 1.4 dtex or more and 1.8 dtex or less. When the fineness is less than 1.2 dtex, the fibers are entangled with each other and the specific volume of the second fiber layer tends to be small. In addition, a fiber layer in which fibers of small fineness are entangled tends to decrease in bulk (specific volume) when stored in a state where force is applied in the thickness direction or when impregnated with a liquid. is there. Therefore, if the fineness of the hydrophobic fibers contained in the second fiber layer is too small, the desired liquid transferability may not be achieved in the sheet. When the fineness of the hydrophobic fiber is too large, the sheet tends to have a hard touch. Further, when the fibers are entangled with each other by the fluid flow entanglement treatment method using a hydrophobic fiber whose fineness is too small, it is difficult for the fluid flow to pass through the fiber web and the fibers may not be uniformly entangled with each other. is there. In that case, fluff may easily occur in the nonwoven fabric.

The second fiber layer contains two or more different fibers as hydrophobic fibers. Two or more types of different hydrophobic fibers are a combination of two or more types of hydrophobic fibers with different degrees of hydrophobicity, or a combination of two or more types of synthetic fibers with different melting points of the thermoplastic resin that constitutes the fiber surface. Is.

The degree of hydrophobicity can be evaluated by, for example, the official moisture regain described in connection with the hydrophilic fiber, or the contact angle with water. Regarding the contact angle with water, a water droplet (ion-exchanged water) is dropped on a non-woven fabric made of only fibers to be evaluated, and the water droplet is photographed within 10 seconds after the water droplet touches the sample. It is obtained by measuring the interface angle with the non-woven fabric. The larger this angle, the more hydrophobic the fiber. By providing fibers having stronger hydrophobicity and fibers having lesser hydrophobicity in the second fiber layer, good texture and soft touch can be imparted to the nonwoven fabric while realizing good liquid transferability. In particular, when two types of fibers having different hydrophobicities are used in combination, a sheet with less fluff can be obtained when the sheet is produced by a fluid flow (particularly water flow) entanglement method. Therefore, the second fiber layer containing two or more types of fibers having different degrees of hydrophobicity is preferably a fiber layer in which the fibers are entangled by a fluid flow (especially water flow) entanglement method or the like.

By combining two or more kinds of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface, the fiber whose surface is formed of the thermoplastic resin having a low melting point is used as the heat-adhesive fiber, and the second fiber The layer can be configured such that the fibers are heat-bonded to each other. Thereby, the second fiber layer can be made bulky, and good liquid transferability can be realized. Moreover, a sheet with less fuzz can be obtained by heat bonding. The melting point is the melting point of the resin after being made into fibers, and is determined from the DSC curve measured according to JIS K7121 (1987).

Examples of the combination of fibers having different hydrophobicity include polyolefin fiber/polyester fiber, polyolefin fiber/regenerated fiber subjected to hydrophobic treatment, polyolefin fiber/acrylic fiber, polyester fiber/hydrophobic treatment. Recycled fiber that has been applied, polyester fiber/acrylic fiber, and more specifically, polypropylene fiber/polyethylene terephthalate fiber, polypropylene fiber/recycled fiber that has been hydrophobized, polyethylene terephthalate fiber/hydrophobized It is a recycled fiber. In particular, the combination of polypropylene fiber/polyethylene terephthalate fiber is preferably used because it can impart good liquid transferability to the sheet and also improves the texture of the sheet.

The hydrophobicity of the fibers is determined by the substances present on the surface of the fibers (eg thermoplastics or hydrophobizing agents). Therefore, as long as two or more kinds of hydrophobic fibers have a difference in hydrophobicity on the fiber surface and the above-mentioned fineness is obtained after forming the sheet, the hydrophobic fiber is not limited to a single fiber, and the surface and internal May be a composite fiber composed of substances different from, for example, a core-sheath composite fiber and a sea-island composite fiber. Alternatively, the hydrophobic fiber may be a fiber whose surface is composed of a plurality of substances, for example, a splittable conjugate fiber. In that case, when comparing the hydrophobicity of the entire fiber, as long as two or more types of hydrophobic fibers having different hydrophobicities are used, for example, a part of the surface of the fiber having stronger hydrophobicity is It may be composed of a component having a weaker hydrophobicity than a component forming a part of the surface of the weaker fiber.

The combination of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface (combination of low melting point fiber/high melting point fiber) is, for example, polyethylene fiber/polypropylene fiber, core-sheath type composite fiber/polypropylene having polyethylene as a sheath component. Fibers, core-sheath type composite fibers containing polyethylene as a sheath component/polyethylene terephthalate fibers, polyethylene fibers/polyethylene terephthalate fibers, polypropylene fibers/polyethylene terephthalate fibers. In particular, the core-sheath type composite fiber/polypropylene fiber combination containing polyethylene as the sheath component imparts good liquid transferability to the sheet because the fiber surfaces are all made of a highly hydrophobic thermoplastic resin. It is possible and preferable. The synthetic fibers may be, for example, core-sheath type composite fibers or sea-island type composite fibers, as long as the thermoplastic resins constituting the fiber surfaces have different melting points and have the above-mentioned fineness after forming the sheet. Further, the low melting point fiber, the melting point of the thermoplastic resin constituting a part of the surface is lower than the melting point of the thermoplastic resin constituting the fiber surface of the other synthetic fiber, and the fineness as described above after forming a sheet. As long as it has it, it is not limited to a single fiber, and may be a side-by-side type composite fiber or a split type composite fiber.

The mixing ratio of the two or more types of hydrophobic fibers is not particularly limited, and is appropriately determined depending on the types of fibers used, considering their hydrophobicity and the like. For example, when two types of fibers having different degrees of hydrophobicity are combined, the fibers having a low degree of hydrophobicity and the fibers having a high degree of hydrophobicity are, for example, in a mass ratio, preferably 10:90 to 90:10. , More preferably 20:80 to 80:20, still more preferably 25:75 to 75:25, and most preferably 30:70 to 70:30 (all are weak hydrophobic:strong hydrophobic). .. When three or more kinds of fibers having different degrees of hydrophobicity are used, the hydrophobic fiber having the highest degree of hydrophobicity is preferably 10% by mass to 90% by mass, more preferably the total mass of the hydrophobic fibers. Accounts for 20% to 80% by weight, even more preferably 25% to 75% by weight, and most preferably 30% to 70% by weight. If the proportion of fibers having a higher degree of hydrophobicity is low, sufficient liquid transfer property may not be obtained, and if the proportion of fibers having a higher degree of hydrophobicity is high, the fibers are entangled with each other by hydroentangling treatment. In this case, fuzz is likely to occur on the sheet.

When two types of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface are combined, the low melting point fiber and the high melting point fiber are, for example, 3:97 to 70:30 by mass ratio, more preferably 5:95. ˜50:50, more preferably 10:90 to 40:60 and most preferably 15:85 to 30:70 (both low melting point and high melting point). Alternatively, when three or more kinds of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface are used, the lowest melting point of the thermoplastic resin forming the fiber surface is the total mass of the hydrophobic fibers combined, preferably Occupies 3% to 70% by mass, more preferably 5% to 50% by mass, even more preferably 10% to 40% by mass, and most preferably 15% to 30% by mass. When the proportion of the low melting point fiber is large, the feel of the sheet becomes hard when heat-bonded, and when the proportion of the low melting point fiber is small, the bulk of the second fiber layer is increased when a force is applied in the thickness direction. It tends to decrease, and a sufficient liquid transfer property may not be obtained, or fuzz is likely to occur in the sheet.

The fiber length of the fibers forming the second fiber layer is appropriately selected according to the form of the second fiber layer. For example, when the second fiber layer is produced as a card web, the fiber length of the constituent fibers is preferably 25 mm or more and 100 mm or less, more preferably 30 mm or more and 70 mm or less, and 35 mm or more and 60 mm or less. Is most preferred. When the first fiber layer is produced as an air-laid web, the fiber length of the constituent fibers is preferably 1 mm or more and 50 mm or less, more preferably 5 mm or more and 30 mm or less. When the first fiber layer is produced as a wet papermaking web, the fiber length of the constituent fibers is preferably 0.5 mm or more and 20 mm or less, more preferably 1 mm or more and 10 mm or less.

The basis weight of the second fiber layer is appropriately selected according to the basis weight of the nonwoven fabric to be finally obtained. Basis weight of the second fibrous layer is preferably ^{5g / m 2 ~40g / m 2} , more preferably from ^{10g / m 2 ~30g / m 2} , most preferably 15g / m ² ~25g / m ² is there. The ratio of the areal weight of the first fiber layer to the areal weight of the second fiber layer is as described in relation to the first fiber layer, and is therefore omitted here.

The second fiber layer may have only one layer (single layer structure) or may have a laminated structure in which two or more layers are laminated. For example, the second fiber layer includes a layer a containing two or more kinds of hydrophobic fibers having different degrees of hydrophobicity and a layer b containing two or more kinds of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface. And a fiber having a two-layer structure in which the fibers are heat-bonded to each other in the layer b. Alternatively, the second fiber layer includes four types of fibers having different degrees of hydrophobicity (referred to as fibers A, B, C, and D for convenience), a fiber layer including the fibers A and B, and a fiber C. And a fiber layer containing the fibers D may be laminated.

(Other fiber layers)
The nonwoven fabric of the present invention may consist of only the first fiber layer and the second fiber layer, but between the first fiber layer and the second fiber layer, the fiber layer of other fibers (hereinafter referred to as “other (Also referred to as a “fiber layer”). The other fiber layer is, for example, a layer made of hydrophobic fibers having a fineness of less than 1.2 dtex and a small fineness. The basis weight of the other fibrous layers, preferably ^{5g / m 2 ~30g / m 2} , more preferably from ^{10g / m 2 ~25g / m 2} , most preferably 15g / m ² ~20g / m ² is there. The ratio of the basis weight of the first fiber layer to the basis weight of the other fiber layers is preferably 0.7 to 16, more preferably 1.0 to 6.0, most preferably 1.2 to 4.0. ..

(Composition of the whole non-woven fabric and manufacturing method of non-woven fabric)
The first fiber layer and the second fiber layer described above are integrated by entanglement of fibers, thermal bonding using thermal bonding of constituent fibers, bonding with a solvent-based adhesive, bonding with a hot melt resin, or the like. Is formed into a non-woven fabric. The nonwoven fabric of the present invention is preferably one which is integrated by entanglement of fibers. The fibers may be entangled by a known method, for example, a needle punch method or a fluid flow entanglement treatment method of injecting a high-pressure fluid (particularly water) onto the fiber web. In the nonwoven fabric of the present invention, it is preferable that the fibers are entangled by the hydroentangling treatment method to be integrated. This is because the hydroentanglement treatment method makes it possible to obtain a soft non-woven fabric having a good feel.

When the second fiber layer includes two or more kinds of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface, the fibers are heated by the synthetic fibers having the lowest melting point of the thermoplastic resin forming the fiber surface. It is preferably adhered. By heat-bonding the fibers together, fluffing can be suppressed in the resulting nonwoven fabric, the appearance of the nonwoven fabric can be improved, and the texture of the nonwoven fabric can be made smooth.

The basis weight of the entire nonwoven fabric is appropriately selected in consideration of the amount of liquid impregnated and the like, depending on the site of the skin to be covered and the like. The overall nonwoven basis weight, for example, well as ^{25g / m 2 ~120g / m 2} , particularly well as ^{35g / m 2 ~90g / m 2} , and more particularly well as ^{40g / m 2 ~75g / m 2} , more in particular it may be a ^{50g / m 2 ~70g / m 2} . If the fabric weight is too small, the amount of liquid that can be impregnated into the non-woven fabric may be small, and it may not be possible to supply a predetermined amount of liquid to the skin.If the fabric weight is too large, it is difficult to fit the sheet on the curved surface of the skin, Adhesion to the skin may be reduced.

When the non-woven fabric is used as a sheet for covering the face, that is, as a base material for a face mask, the basis weight of the whole non-woven fabric is preferably 25 g/m ^{2 to} 120 g/m ² , and more preferably 35 g/m ^{2 to} 90 g. / m ^2, even more preferably from 40 g / m ² ～75G / m ^2, particularly preferably from ^{50g / m 2 ~70g / m 2} . When the basis weight of the non-woven fabric is less than 25 g/m ² when used as a base material for a face mask, the amount of liquid that can be impregnated into the non-woven fabric is small, and sufficient liquid may not be supplied to the face. When the basis weight of the non-woven fabric exceeds 120 g/m ² , it may be difficult to adhere the sheet along the unevenness of the face (for example, around the nose).

The total thickness of the non-woven fabric is preferably 0.80 mm or more, more preferably 0.83 mm or more, and most preferably 0.85 mm or more. The total thickness of the nonwoven fabric is preferably 1.5 mm or less, more preferably 1.2 mm or less, and most preferably 1.0 mm or less. If the total thickness of the non-woven fabric is too small, the amount of liquid that can be impregnated into the non-woven fabric is small, and it may not be possible to supply a predetermined amount of liquid to the skin. If the total thickness of the non-woven fabric is too large, it may be difficult for the sheet to follow the curved surface of the skin, and the adhesion of the sheet to the skin may deteriorate. In addition, the total thickness of the non-woven fabric mentioned here refers to one measured with a load of 3 g per 1 cm ² of the non-woven fabric applied.

The density of the entire nonwoven fabric is preferably 0.070 g/cm ³ or less, more preferably 0.067 g/cm ³ or less. The density of the whole nonwoven fabric is preferably 0.050 g/cm ³ or more, more preferably 0.060 g/cm ³ or more. If the density of the whole non-woven fabric is too high or too low, the amount of liquid that can be impregnated into the non-woven fabric may be too small to supply a predetermined amount of liquid to the skin, or it may be difficult to fit the sheet along the curved surface of the skin. , The adhesion of the sheet to the skin may decrease. The density of the entire non-woven fabric here is obtained from the basis weight of the whole non-woven fabric and the thickness of the whole non-woven fabric, and the total thickness of the non-woven fabric is measured with a load of 3 g per 1 cm ² of the non-woven fabric. Refers to.

The non-woven fabric is obtained by laminating a fibrous web serving as a first fibrous layer (hereinafter also referred to as “first fibrous web”) and a fibrous web serving as a second fibrous layer (hereinafter also referred to as “second fibrous web”), A process for integrating a fibrous web by arranging a fibrous web that will be another fibrous layer (hereinafter, also referred to as “another fibrous web”) between the first fibrous web and the second fibrous web as necessary. It can be manufactured by attaching to. Examples of the treatment for integrating the fibrous web include entanglement treatment between fibers, heat adhesion treatment, adhesion treatment with solvent adhesive, and adhesion treatment with hot melt resin. The nonwoven fabric of the present invention is preferably manufactured by integrating the fibrous web by a process of entangling fibers. The process of entanglement of fibers is, for example, a needle punching process or a fluid flow (especially water flow) entanglement process.

The form of any fiber web may be any selected from a parallel web, a cross web, a card web such as a semi-random web and a random web, an air-laid web, a wet papermaking web, and a spunbond web. .. The form of each fibrous web may be the same or different. Each fibrous web is preferably a parallel web. A parallel web has high productivity and is easy to give a non-woven fabric which is bulky and has a large specific volume. Further, since a soft nonwoven fabric is easily obtained by using the parallel web, the liquid-impregnated skin covering sheet produced using the parallel web is also likely to be soft and have excellent texture.

When the fibers are entangled with each other by the hydroentanglement treatment, the hydroentanglement treatment is carried out by placing a laminated body of the fiber web on a support and jetting a columnar water flow. For example, the support is preferably a plain weave support of 80 mesh or more and 100 mesh or less. In the hydroentangling treatment, a water flow of 1 MPa or more and 15 MPa or less is applied from a nozzle provided with orifices having a hole diameter of 0.05 mm or more and 0.5 mm or less at intervals of 0.3 mm or more and 1.5 mm or less to laminate a fibrous web. It may be carried out by spraying the front and back of the body 1 to 5 times, respectively. 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 fiber web after the entanglement treatment may be subjected to a drying treatment for removing water and used as it is as a base material of the sheet. When the second fiber layer contains two or more kinds of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface, the fibers are heated by the synthetic fiber having the lowest melting point of the thermoplastic resin forming the fiber surface. It is preferable to apply a heat-bonding treatment for bonding. The heat-bonding treatment is preferably carried out at a temperature at which a thermoplastic resin having the lowest melting point (hereinafter also referred to as “low-melting point component”) among the thermoplastic resins constituting the surface of the synthetic fiber is melted or softened. When the entanglement treatment is hydroentanglement treatment, the heat-bonding treatment may also serve as a drying treatment for removing water from the fibrous web. Alternatively, the heat bonding treatment and the drying treatment may be performed separately.

In the heat-bonding treatment, when the fiber components other than the low-melting point component are melted, the number of bonding points increases or large bonding points are formed, and the flexibility of the nonwoven fabric is impaired. select. For example, when the second fiber layer contains synthetic fibers whose fiber surface is made of polyethylene, and the fiber surfaces of other synthetic fibers are made of a thermoplastic resin having a higher melting point than polyethylene, the thermal bonding treatment is It is preferable to carry out at a temperature of 130° C. or higher and 150° C. or lower. By adjusting the heat treatment temperature, the degree of thermal adhesion due to the low melting point component can be changed. The degree of thermal adhesion affects the strength, flexibility, and feel of the non-woven fabric.

The heat-bonding treatment may be carried out by a known method, and specifically, a hot air through heat treatment machine (also called an air through heat processing machine), a hot air blowing heat treatment machine, an infrared heat treatment machine, or a heat roll (heat treatment). It is carried out using a processing machine (including an embossing roll). Of these, the heat treatment using a hot air through heat treatment machine, a hot air blowing heat treatment machine, and an infrared heat treatment machine is preferable because it is difficult to reduce the bulk of the nonwoven fabric.

(Liquid impregnated skin covering sheet)
The nonwoven fabric of the present invention constitutes a liquid-impregnated skin covering sheet by impregnating this with a liquid. The liquid to be impregnated and the amount to be impregnated are appropriately selected according to the application. When the sheet is provided as an interpersonal liquid-impregnated skin covering sheet such as an interpersonal face mask, a keratin care sheet and a décolleté sheet, a liquid containing an active ingredient (for example, cosmetics) is 600 parts by mass with respect to 100 parts by mass of the nonwoven fabric. Parts may be impregnated with an impregnation amount of 2500 parts by mass or less, particularly 600 parts by mass or more and 1500 parts by mass or less, more particularly 700 parts by mass or more and 1500 parts by mass or less. You can The active ingredient is, for example, a moisturizing ingredient, a keratin softening ingredient, a cleansing ingredient, an antiperspirant ingredient, a fragrance ingredient, a whitening ingredient, a blood circulation promoting ingredient, an anti-ultraviolet ingredient, and a slimming ingredient, but not limited to these. ..

The face mask has a shape suitable for covering the face, and further has, for example, a portion corresponding to the eyes, nose and mouth with an opening or a notch formed by punching if necessary. Provided. Alternatively, the face mask may be shaped to cover only a portion of the face (eg, eyes, mouth, nose or cheeks). Alternatively, the face mask may be provided as a set consisting of a sheet covering the eyes and a sheet covering the mouth, or may be provided as a set of sheets separately covering three or more parts.

The keratin care sheet is a skin covering sheet that is used for heels, elbows, knees, etc. where the keratin is thick and hardens easily.By impregnating a liquid containing a keratin softening component and a moisturizing component, etc. It is a stimulating sheet and a sheet that has the effect of promoting the removal of excess calluses. The nonwoven fabric of the present invention can be used as a base material in a keratin care sheet that exhibits any of the effects and efficacy. A keratinous care sheet, for example, a keratinous care sheet for heels, has a notch and/or notch and/or a part of the sheet punched out to make it easier to fit the curve of the heel during application. Is provided.

A liquid-impregnated skin-covering sheet is a moisturizing component or used to moisturize or otherwise care for any part of the body, such as the neck, the back of the hand, the part from the neck to the chest (also called the décolleté). It may be a moisturizing sheet impregnated with a liquid containing other effects. Alternatively, the liquid-impregnated skin covering sheet may be a slimming sheet impregnated with a liquid containing a slimming component. The slimming sheet is used by being attached to the thigh or the abdomen, for example.

Either form of the sheet is used with the first fiber layer in contact with the skin. Therefore, the second fiber layer does not come into contact with the skin and is exposed to the external environment. Due to the hydrophobic nature of the second fibrous layer, the liquid is more likely to migrate from the second fibrous layer to the hydrophilic first fibrous layer, rather than evaporating to the external environment, and the liquid that has migrated to the first fibrous layer is Further, it will be transferred to the skin. In addition, the liquid that has moved to the first fiber layer forms a film on the skin surface, and plays a role of making the sheet adhere well to the skin.

Hydrophilic fiber 1 (indicated as "cotton" in the table): cotton with a fineness of 1.0 to 5.0 dtex and fiber length of 10 to 60 mm Hydrophobic fiber 1 (indicated as "PP single" in the table): fineness of 1.5 dtex , A single fiber made of polypropylene with a fiber length of 51 mm (melting point 163° C., trade name PN804, manufactured by Daiwabo Polytech Co., Ltd.)
Hydrophobic fiber 2 (indicated as “PET single” in the table): Single fiber made of polyethylene terephthalate having a fineness of 1.45 dtex and a fiber length of 38 mm (melting point 260° C., trade name T402, manufactured by Toray Industries, Inc.)
Hydrophobic fiber 3 (indicated as “PP/PE fine” in the table): fineness 1.7 dtex, fiber length 51 mm, polypropylene (melting point 167° C.) as core component, polyethylene (melting point 138° C.) as sheath component, Core-sheath composite fiber (trade name: HR-NTW, manufactured by Toray Industries, Inc.)
Hydrophobic fiber 4 (indicated as “divided” in the table): Fineness of 2.2 dtex, fiber length of 51 mm, polyethylene and polyethylene terephthalate are alternately arranged in a chrysanthemum pattern in the fiber cross section, and a split type composite fiber with 8 sections (Product name DFS(SH), Daiwabo Polytech Co., Ltd.)
Hydrophobic fiber 5 (indicated as "Special Tencel" in the table): Fineness of 1.7 dtex, fiber length of 38 mm, Tencel with a hydrophobic treatment on the fiber surface (trade name Tencel Biosoft, manufactured by Renzing Co.)
Hydrophobic fiber 6 (indicated as "PP/PE thick" in the table): fineness 2.2 dtex, fiber length 51 mm, polypropylene (melting point 167°C) as core component, polyethylene (melting point 138°C) as sheath component, Core-sheath type composite fiber (trade name NBF(H), manufactured by Daiwabo Polytech Co., Ltd.)

(Test 1)
(Examples 1-2, Comparative Examples 1-4)
A hydrophilic fiber 1 (cotton) alone was used to prepare the first fiber web with the aim shown in Table 1, and the hydrophobic fibers of the types shown in Table 1 were mixed at the ratio shown in Table 1 to give the result shown in Table 1. A second fiber web with the indicated aim was made. Both the first fibrous web and the second fibrous web were made using a parallel card machine. In addition, the basis weight of the web actually manufactured does not always follow the target basis and has an error (same in the following tests).

A laminated web having a two-layer structure in which a first fibrous web and a second fibrous web are laminated, or a three-layer structure of a first fibrous web/second fibrous web/first fibrous web, or supporting only the first fibrous web It was placed on the body, and the web was subjected to hydroentanglement treatment to entangle the fibers. In the hydroentangling treatment, a columnar water stream of 3.0 MPa was jetted twice to one surface of the web using a nozzle in which orifices having a hole diameter of 0.1 mm were provided at intervals of 0.6 mm, and 4.0 MPa to the other surface. The columnar water stream was injected twice to carry out. Then, it was dried to obtain a nonwoven fabric.

Table 1 shows the areal weight, thickness and density of the obtained non-woven fabric. The thickness was measured using a thickness measuring machine (trade name: THICKNESS GAUGE model CR-60A, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) under a load of 3 g and a load of 20 g per 1 cm ^{2 of} the sample. The density was calculated from the basis weight and the thickness measured by applying a load of 3 g per cm ² .

(Evaluation of liquid transferability)
A sample was prepared by cutting the obtained non-woven fabric into a size of 150 mm in the longitudinal direction (machine direction) and 70 mm in the lateral direction (width direction), and impregnated with 700 parts by mass of water per 100 parts by mass of the sample. .. The sample impregnated with water was placed on the Kim towel (trade name) whose weight was previously measured. The sample was placed on the Kim towel so that the first fiber layer (for samples in which the first fiber layer is located on both sides, the first fiber layer having a larger basis weight) is in contact with the Kim towel. The sample was left on the Kim towel for 30 minutes, and the mass of the Kim towel after the standing was measured. The increase in the mass of Kim Towel after 30 minutes was taken as the amount of water transferred from the sample to Kim Towel, and the ratio of the amount of transferred water to the mass of the impregnated liquid was calculated as a percentage. evaluated.
In Test 1, the liquid transferability was evaluated under the conditions of a temperature of 23.3° C. and a humidity of 72%.
Table 1 shows the evaluation results of liquid transferability.

In each of Examples 1 and 2, the liquid transfer property was good, and the touch and the appearance were also good. A non-woven fabric composed of only hydrophilic fibers (Comparative Example 1) and a non-woven fabric having a three-layer structure of a first fiber layer/a second fiber layer/a first fiber layer, in which a hydrophilic first fiber layer is located in the external environment. All of (Comparative Examples 2 and 3) had low liquid transferability. For Comparative Examples 2 and 3, the liquid retained in the second fiber layer moved not only to the first fiber layer on the lower side but also to the first fiber layer located on the upper side (external environment), and the liquid was transferred by that amount. It is presumed that the sex has deteriorated. In Comparative Example 4, the liquid transferability was good, but the appearance was poor due to a large amount of fuzz. It is considered that this is because the second fiber layer was composed of only polypropylene fibers having relatively strong hydrophobicity, and thus the degree of entanglement between the fibers due to the water flow was reduced.

(Test 2)
(Example 3, Comparative Examples 5 to 7)
A hydrophilic first fiber (cotton) alone was used to prepare a first fiber web having the aim shown in Table 2, and hydrophobic fibers of the types shown in Table 2 were mixed in the proportion shown in Table 2 to give Table 2. A second fiber web with the indicated aim was made. Both the first fibrous web and the second fibrous web were made using a parallel card machine.

A laminated web having a two-layer structure in which a first fibrous web and a second fibrous web were laminated, or only the first fibrous web was placed on a support, and the web was subjected to hydroentangling treatment to entangle the fibers. In the hydroentangling treatment, a columnar water stream of 3.0 MPa was jetted twice to one surface of the web using a nozzle in which orifices having a hole diameter of 0.1 mm were provided at intervals of 0.6 mm, and 4.0 MPa to the other surface. The columnar water stream was injected twice to carry out. Then, it was dried to obtain a nonwoven fabric.

The fabric weight and thickness of the nonwoven fabrics obtained in Example 3 and Comparative Examples 5 to 7 were measured. The measuring method is as described above. The measurement results are shown in Table 2.
The liquid transfer properties of the non-woven fabrics obtained in Example 3 and Comparative Examples 5 to 7 were evaluated by the same method as that described in connection with Test 1. However, the evaluation was performed under the conditions of a temperature of 17° C. and a humidity of 60%. Table 2 shows the evaluation results of liquid transferability. It should be noted that the evaluation of the liquid migration property of Test 2 was performed in an environment different from that of Test 1, so that the value shown as the evaluation result is different from that of Test 1.

Example 3 showed a good liquid transfer property, and the touch and the appearance were also good. Comparative Example 6 was inferior in terms of liquid transferability. This is because the second fiber layer contains ultrafine fibers obtained by dividing the splittable conjugate fiber, the specific volume of the second fiber layer is small, and the amount of water held by the second fiber layer is small, It is presumed that the force pushing the first fiber layer was small. Further, the nonwoven fabric of Comparative Example 6 had a small thickness when a load of 20 g was applied, and the bulk was likely to be reduced when a force was applied in the thickness direction for a long time. It is speculated that this is also due to the fact that the second fiber layer contains ultrafine fibers and the fibers are intimately entangled with each other. In Comparative Example 5 including only the hydrophilic fiber layer, the liquid transfer property was also low in Test 2.

In Comparative Example 7, the second fiber layer was composed of polyethylene terephthalate only, and its liquid migration property was similar to that of Example 3. However, the thickness is small when a load of 20 g is applied, the bulk tends to decrease when a force is applied in the thickness direction, and liquid transferability after long-term storage with a force applied in the thickness direction. Tended to decline. It is speculated that this is because polyethylene terephthalate has a slightly high hydrophilicity, and the fibers were entangled more densely by the hydroentangling treatment.

(Test 3)
(Examples 4 and 5, Comparative Examples 8 and 9)
A hydrophilic fiber 1 (cotton) alone was used to prepare the first fiber web with the aim shown in Table 3, and the types of hydrophobic fibers shown in Table 3 were mixed at the ratio shown in Table 3 to give Table 3. A second fiber web with the indicated aim was made. Both the first fibrous web and the second fibrous web were made using a parallel card machine.

A laminated web having a two-layer structure in which a first fibrous web and a second fibrous web were laminated, or only the first fibrous web was placed on a support, and the web was subjected to hydroentangling treatment to entangle the fibers. In the hydroentangling treatment, a columnar water stream of 3.0 MPa was jetted twice to one surface of the web using a nozzle in which orifices having a hole diameter of 0.1 mm were provided at intervals of 0.6 mm, and 4.0 MPa to the other surface. The columnar water stream was injected twice to carry out. In each of Example 4 and Comparative Example 8, a drying treatment was then performed to obtain a nonwoven fabric. In Example 5 and Comparative Example 9, heat treatment was performed with a hot air penetration type heat treatment machine set at 140° C., and the fibers of the hydrophobic fiber 3 and the hydrophobic fiber 6 were heat-bonded to obtain a nonwoven fabric.

The fabric weights and thicknesses of the nonwoven fabrics obtained in Examples 4 and 5 and Comparative Examples 8 and 9 were measured. The measuring method is as described above. The measurement results are shown in Table 3.
The liquid transfer properties of the non-woven fabrics obtained in Examples 4 and 5 and Comparative Examples 8 and 9 were evaluated by the same method as that described in connection with Test 1. However, the evaluation was performed under the conditions of a temperature of 24° C. and a humidity of 52%. Table 3 shows the evaluation results of liquid transferability. It should be noted that the evaluation of the liquid transferability of Test 3 was carried out in an environment different from that of Tests 1 and 2, so that the value shown as the evaluation result is different from that of Tests 1 and 2.

In each of Examples 4 and 5, good liquid migration was exhibited, and the touch and appearance were also good. In Comparative Example 8 including only the hydrophilic fiber layer, the liquid transfer property was also low in Test 3. In Comparative Example 9, all the fibers constituting the surface on the side not in contact with the skin were heat-bonded, so that the texture was hard.

The non-woven fabric of the present invention is impregnated with a liquid, and when the first fiber layer is used in contact with the skin, the liquid is easily transferred to the skin, so that the liquid easily stays on the skin, thereby ensuring good adhesion. In addition, since the liquid can exert the effect on the skin well, it is useful as a base material for a face mask or the like.

Claims (8)

A first fiber layer containing 50% by mass or more of hydrophilic fibers and a second fiber layer containing 50% by mass or more of hydrophobic fibers that are more hydrophobic than the hydrophilic fibers contained in the first fiber layer; A non-woven fabric in which the fiber layer forms one surface and the second fiber layer forms the other surface,
The hydrophobic fiber has a fineness of 1.2 dtex or more,
The hydrophobic fibers include two or more kinds of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface,
The fibers are heat-bonded to each other by a synthetic fiber contained in the second fiber layer and having a lowest melting point of the thermoplastic resin constituting the fiber surface,
A nonwoven fabric for a liquid-impregnated skin-covering sheet, which is used by bringing the first fiber layer into contact with the skin. The liquid-impregnated skin according to claim 1, wherein the second fiber layer includes, as the hydrophobic fiber, a single fiber made of polypropylene and a core-sheath type composite fiber having polyethylene as a sheath component and polypropylene as a core component. Nonwoven fabric for coated sheets. Wherein the hydrophobic fibers have the following fineness 3.5 dtex, the liquid saturant skin covering sheet nonwoven fabric according to any one of claims 1 or 2. A liquid-impregnated skin-covering sheet obtained by impregnating the nonwoven fabric according to any one of claims 1 to 3 with a liquid in an amount of 600 parts by mass or more and 2500 parts by mass or less. A face mask obtained by impregnating the nonwoven fabric according to any one of claims 1 to 3 with a liquid in an amount of 600 parts by mass or more and 2500 parts by mass or less. A method for producing a nonwoven fabric for a liquid-impregnated skin-covering sheet, comprising a first fiber layer and a second fiber layer, which is used by bringing the first fiber layer into contact with the skin,
Laminating a first fibrous web containing 50% by mass or more of hydrophilic fibers and a second fibrous web containing 50% by mass or more of hydrophobic fibers that are more hydrophobic than the hydrophilic fibers contained in the first fibrous web. To obtain a laminated web,
Subjecting the hydroentangling process to integrate the laminated web, and
Subjecting the laminated web to a heat-bonding treatment
In the manufacturing method,
The hydrophobic fiber has a fineness of 1.2 dtex or more,
The second fibrous web contains, as the hydrophobic fiber, two or more kinds of synthetic fibers having different melting points of the thermoplastic resin forming the fiber surface,
The heat-bonding treatment is a heat-bonding treatment for thermally bonding the fibers with each other by the synthetic fiber having the lowest melting point of the thermoplastic resin forming the fiber surface included in the second fibrous web,
The laminated web has one surface formed of the first fibrous web and the other surface formed of the second fibrous web.
A method for producing a nonwoven fabric for a liquid-impregnated skin-covering sheet, wherein the first fibrous web serves as the first fibrous layer and the second fibrous web serves as the second fibrous layer. The method for producing a nonwoven fabric for a liquid-impregnated skin covering sheet according to claim 6, wherein the second fibrous web is a card web. The said laminated web is obtained by disposing another fibrous web to be another fibrous layer between the first fibrous web and the second fibrous web. A method for producing a nonwoven fabric for a liquid-impregnated skin-covering sheet.