JP2017089063A - Nonwoven fabric for liquid impregnating skin covering sheet and liquid impregnating skin covering sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonwoven fabric that provides a liquid impregnating skin covering sheet, the liquid impregnated in which easily remains on the skin.SOLUTION: The nonwoven fabric comprises a first fiber layer comprising 50 mass% or more of hydrophilic fibers having a fiber length of 1 mm-100 mm and a second fiber layer comprising 50 mass% or more of hydrophobic fibers having hydrophobicity higher than that of the hydrophilic fibers comprised in the first fiber layer and having a fiber length of 1 mm-100 mm. The first fiber layer forms one surface and the second fiber layer forms other surface. The hydrophobic fiber has a fineness of 1.2 dtex or more. The nonwoven fabric is used as a substrate for a liquid impregnating skin covering sheet that is to be used with the first fiber layer in contact with the skin.SELECTED DRAWING: None

Description

  The present disclosure relates to a nonwoven fabric constituting a liquid-impregnated skin-coated sheet impregnated with a liquid, particularly a cosmetic, and a liquid-impregnated skin-coated sheet using the nonwoven fabric.

  Various sheets impregnated with a liquid, which are used to coat the human skin and apply a predetermined substance to the human skin, have been proposed and put into practical use. Specific examples include a liquid-impregnated skin-covering sheet impregnated with a liquid containing an active ingredient (for example, cosmetics) (a keratin care sheet used for face masks, heels, elbows, knees, and the like). As the base material for the liquid-impregnated skin coating sheet, a nonwoven fabric is generally used. Since liquid-impregnated skin-coated sheets are often used in close contact with the skin for a relatively long period of time, various non-woven fabrics have been proposed as base materials in terms of adhesion, liquid release, touch, and convenience. ing.

  For example, Patent Document 1 is a laminated nonwoven fabric obtained by laminating at least two layers of an ultrafine synthetic fiber layer and a hydrophilic fiber layer, and the nonwoven fabric for a beauty sheet that can be used by contacting the hydrophilic layer with the body of the laminated nonwoven fabric. Has proposed. According to Patent Document 1, this non-woven fabric is said to give a cosmetic sheet that can suppress the evaporation of the impregnated cosmetic liquid and keep the moisturizing effect for a long time. Patent Document 2 includes a first fiber layer including 50% by mass or more of a three-dimensional crimped fiber having a three-dimensional crimp, and a second fiber layer including 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 obtained by combining the first fiber layer and the second fiber layer. A laminated nonwoven fabric that is formed by crimping in latent crimpable fibers after being entangled and integrated, and the surface of the nonwoven fabric is substantially flat and has substantially no pores. A liquid impregnated skin coating sheet is proposed.

JP 2005-124916 A JP 2007-211131 A

  In one aspect, the present embodiment is a liquid-impregnated skin coating in which the impregnated liquid is likely to stay on the skin, the adhesion effect and the moisturizing effect due to the liquid are more exhibited, or the active ingredient contained in the liquid is easily transferred to the skin. It aims at providing the nonwoven fabric which gives a sheet | seat. Another object of the present embodiment is to provide a liquid-impregnated skin-covering sheet, particularly a face mask, obtained by impregnating the nonwoven fabric with a liquid.

In the first aspect, the present embodiment is more hydrophobic than the first fiber layer containing 50% by mass or more of hydrophilic fibers having a fiber length of 1 mm to 100 mm, and the hydrophilic fiber contained in the first fiber layer. And a second fiber layer containing 50 mass% or more of hydrophobic fibers having a fiber length of 1 mm to 100 mm, the first fiber layer forming one surface, and the second fiber layer forming the other surface Because
The hydrophobic fiber has a fineness of 1.2 dtex or more,
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 embodiment provides a liquid-impregnated skin-covering sheet obtained by impregnating the nonwoven fabric according to the first aspect or the second aspect with liquid in an amount of 600 parts by mass to 2500 parts by mass.
In the third aspect, the present embodiment provides a face mask in which the nonwoven fabric is impregnated with liquid in an amount of 600 parts by mass to 2500 parts by mass.

  The non-woven fabric of this embodiment, when the skin is coated in a state of being impregnated with the liquid, the impregnated liquid tends to stay on the skin, and the adhesion effect and the moisturizing effect due to the liquid are more exhibited, or included in the liquid Gives a liquid-impregnated skin-coated sheet in which the active ingredient is more easily transferred by the skin.

(Background to the present embodiment)
Patent Document 1 proposes to use a fiber obtained from a melt blown fiber, a spunbond fiber, and a split fiber as the ultrafine synthetic fiber. Among these, the melt blown fiber and the spunbond fiber are used in the form of a melt blown nonwoven fabric and a spunbond nonwoven fabric, respectively. It is difficult to entangle with the layers, and delamination tends to occur in the resulting laminated nonwoven fabric. Further, the melt blown nonwoven fabric and spunbond nonwoven fabric of ultrafine synthetic fibers have a small specific volume (bulk), and the amount of liquid that can be held by the melted nonwoven fabric tends to be small. Therefore, when a nonwoven fabric using these is impregnated with a liquid, the weight of the ultrafine synthetic fiber layer impregnated with the liquid is reduced and the force for pressing the hydrophilic fiber layer is weakened. It was found that it tends to be difficult to transfer to the skin, or tends to reduce the adhesion to the skin.

  The ultrafine fiber layer containing the ultrafine fibers obtained from the split fibers has a larger specific volume than a melt blown nonwoven fabric, etc., and a sheet in which a nonwoven fabric using this is impregnated with a liquid transfers the liquid to the skin. It is easy and increases the adhesion to the skin. However, the ultrafine fiber layer containing the ultrafine fibers obtained from the split fibers is stored in a state wound around a roll, for example, or as a liquid-impregnated skin-covered sheet and stacked in a plurality of sheets in a packaging bag. When housed and stored, the thickness decreases and the specific volume tends to decrease. Therefore, the liquid-impregnated skin-covering sheet containing the ultrafine fiber layer is also likely to show the same tendency as the sheet containing the melt blown nonwoven fabric or the like.

The present inventors have further promoted the transfer of the liquid to the skin, ensured adhesion to the skin by the liquid located between the sheet and the skin, and exerted the action (for example, moisturizing) on the skin by the liquid. The construction of a liquid-impregnated skin-covering sheet that can be better demonstrated was studied. as a result,
-By using a staple fiber having a fiber length of about 1 mm to 100 mm and making the nonwoven fabric entangled with each other, the amount of liquid that can be retained can be secured to some extent, and-The nonwoven fabric is made of a hydrophilic fiber layer and a hydrophobic fiber When the layer has a two-layer structure comprising a layer, the hydrophilic fiber layer is the side that comes into contact with the skin, and the fiber layer that does not come into contact with the skin is made of hydrophobic fibers having a fineness of 1.2 dtex or more As a result, it was found that the transfer of the liquid to the skin was further promoted, and the present embodiment was devised.

  A nonwoven fabric for a liquid-impregnated skin-covering sheet (hereinafter also simply referred to as “sheet”) of the present embodiment includes a first fiber layer containing 50% by mass or more of hydrophilic fibers having a fiber length of 1 mm to 100 mm, and a first fiber And a second fiber layer containing 50% by mass or more of hydrophobic fibers having a fiber length of 1 mm to 100 mm that is more hydrophobic than the hydrophilic fibers contained in the layer, and the hydrophobic fibers contained in the second fiber layer It has a fineness of 1.2 dtex or more. Hereinafter, the configuration of each fiber layer will be described first.

(First fiber layer)
The first fiber layer contains 50% by mass or more of hydrophilic fibers. The first fiber layer containing hydrophilic fibers serves to hold a liquid (eg, liquid cosmetic) impregnated in the nonwoven fabric and supply the held liquid to an object (specifically, skin).
The hydrophilic fiber is a fiber having an official moisture content of 5% or more. The official moisture content is shown in JIS L0105 (2006). When the official moisture content is not known, the value calculated from the following formula is used as the official moisture content.
Official moisture content (%) = [(W−W ′) / W ′] × 100
Here, W means the mass (g) of the fiber in an environment of a temperature of 20 ° C. and a humidity of 65% RH, and W ′ means the mass (g) when the fiber is completely dry. In addition, the mass of the fiber in the environment of temperature 20 degreeC and humidity 65% RH means the mass when a fiber is left to stand in the environment of temperature 20 degreeC and humidity 65% RH, and becomes a fixed mass, and fiber The mass at the time of absolute drying means the mass when the fiber is left in a dryer set at 105 ° C. and becomes a constant mass.

  Specific examples of hydrophilic fibers include 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 Hydrophobic synthetic fibers (synthetic fibers having an official moisture content of less than 5%) are subjected to a hydrophilic treatment. Examples of the hydrophilic treatment include corona discharge treatment, sulfonation treatment, graft polymerization treatment, kneading of a hydrophilic agent into fibers, and application of a durable oil agent. The hydrophilic fiber is preferably a cellulosic fiber. Cellulosic fibers are more specifically 1) pulps such as mechanical pulp, regenerated pulp and chemical pulp, 2) plant natural fibers such as cotton, hemp, and 3) viscose rayon, cupra, and Regenerated fibers such as solvent-spun cellulose fibers (for example, lentung lyocell (registered trademark) and tencel (registered trademark)).

  Among plant-based natural fibers, cotton has long been used as a natural material and is widely used as a material for clothes and hygiene materials. It has a general impression that it is gentle to the skin, comfortable to touch, and safe. Give to consumers. Therefore, the use of cotton can provide a product that is more easily accepted by consumers. When using cotton, the cotton generally used for nonwoven fabric manufacture can be used arbitrarily. Specifically, cotton having a fiber length (average fiber length) of about 20 to 60 mm can be used. A plurality of cottons having 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 fields of cosmetic puffs and wet sheets that come into contact with human skin and is relatively inexpensive.

  The fineness of the hydrophilic fiber is preferably about 0.1 to 6 dtex, more preferably about 0.3 to 3.5 dtex, still more preferably about 0.5 to 2.5 dtex, and Most preferably, it is about 8 to 1.8 dtex. A hydrophilic fiber having a fineness within this range is suitable for ensuring flexibility. When the fineness of the hydrophilic fiber is too small, the card passing property at the time of producing the fiber web is deteriorated, and the productivity of the nonwoven fabric may be lowered. If the fineness of the hydrophilic fiber is too large, the nonwoven fabric becomes rough and the tactile sensation may be reduced. In addition, if the fineness of the hydrophilic fiber is too large, the spacing and voids between the fibers in the first fiber layer are widened, the ability of the first fiber layer to hold the liquid is reduced, the amount of liquid impregnation is reduced, and the use Sometimes a liquid (for example, cosmetics or chemicals) hangs down, so-called dripping occurs and the feeling of use may be lowered.

  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 hold the liquid is reduced, and the sheet cannot be impregnated with a predetermined amount of liquid, or the liquid is transferred to the skin (hereinafter referred to as “liquid”). May also be insufficient, or may not be able to supply a sufficient amount of liquid to the skin. When the first fiber layer includes fibers other than the hydrophilic fibers, the other fibers may be hydrophobic fibers. The hydrophobic fiber will be described later in connection with the second fiber layer. As another fiber, one kind of hydrophobic fiber may be used, and two or more kinds of hydrophobic fibers may be used.

  The fiber length of the fibers constituting 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. More preferably. 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, and 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, and more preferably 1 mm or more and 10 mm or less.

  The first fiber layer may be composed of only one layer (single layer structure) or may have a laminated structure in which two or more layers are laminated. For example, a 1st fiber layer may consist of a layer containing 50 mass% or more of cotton, and a layer (for example, tissue) containing a pulp. When the layer containing pulp is contained 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. The basis weight of the first fiber layer is preferably 20 g / m ² or more, more preferably 25 g / m ² or more, further preferably 30 g / m ² or more, and particularly preferably 35 g / m ² or more. The basis weight of the first fiber layer is preferably 80 g / m ² or less, more preferably 60 g / m ² or less, further preferably 50 g / m ² or less, and particularly preferably 45 g / m ² or less. 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, more preferably 0.8 to 6. 0.0, more preferably 1.2 to 4.0, most preferably 1.4 to 3.0.

  If the basis weight of the first fiber layer is too small, or if 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-coated sheet is reduced, and the liquid transferability May be insufficient, or the amount of liquid supplied to the skin itself may be reduced. 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 proportion of the second fiber layer in the entire nonwoven fabric becomes small, and the liquid transfer of the sheet May be insufficient. Further, if the basis weight of the first fiber layer is too large, or if 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 be too soft. Therefore, for example, when sheets impregnated with liquid are stacked, it becomes difficult to peel off and remove only one sheet, or when the sheet impregnated with liquid is folded with the first fiber layer inside The feeling of use may decrease, for example, it may be difficult to spread the sheet.

(Second fiber layer)
A 2nd fiber layer contains 50 mass% or more of hydrophobic fibers which have a specific fineness. The hydrophobic fibers contained in the second fiber layer are higher in hydrophobicity than the hydrophilic fibers contained in the first fiber layer, and therefore the second fiber layer is stronger in hydrophobicity than the first fiber layer. Showing gender. Therefore, when the sheet of this embodiment is impregnated with a liquid and the skin is covered with the sheet so that the first fiber layer is in contact with the skin, the second fiber layer is the first fiber layer with stronger liquid hydrophilicity. The liquid that has moved to the side of the first fiber layer and moved to the side of the first fiber layer further moves to the skin. Moreover, in the nonwoven fabric of this embodiment, since the 2nd fiber layer contains the hydrophobic fiber which has a specific fineness, it has bulkiness, and when the force was applied to the thickness direction and the liquid was impregnated Sometimes, the voids between the fibers can be relatively retained in the layer. Since the gap between the fibers becomes a part that holds the liquid, the second fiber layer can hold more liquid as the ratio of the gap is larger. Therefore, when the sheet of this embodiment is impregnated with the liquid, the first fiber layer is pressed toward the skin by the weight of the liquid held in the bulky second fiber layer, and this also applies to the liquid skin. It is surmised that this 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 surface of a hydrophilic fiber that has been subjected to a treatment for imparting hydrophobicity (hydrophobization treatment). The thermoplastic resin is not particularly limited. For example, 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, etc.), polyolefin resins such as polybutene-1, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer, nylon 6, nylon 12, and Polyamide resins such as nylon 66, acrylic resins, polycarbonate, polyacetal, engineering plastics such as polystyrene and cyclic polyolefin, and elastomers thereof It is selected to Luo arbitrary. The fiber in which the surface of the hydrophilic fiber has been subjected to a hydrophobic treatment is, for example, one obtained by treating the surface of a regenerated fiber with a hydrophobizing agent.

  From the viewpoint of improving the transfer of liquid to the skin, it is preferable to use polyolefin fibers as hydrophobic fibers, in which a polyolefin resin having a relatively strong hydrophobicity forms part or all of the fiber surface, It is particularly preferable to use a single fiber made of polypropylene. Since polypropylene has a relatively high melting point, it is preferably used because it can be easily subjected to a drying treatment when a nonwoven fabric is produced by a fluid flow (particularly water flow) entanglement method described later. In addition, since polypropylene has low thermal conductivity, heat transferred from the skin to the liquid is less likely to escape from the sheet, reducing the user's sensation of cooling the skin during use. When warmed and used, it is difficult to lower the temperature of the sheet. In addition, since polypropylene has a relatively large water contact angle among thermoplastic resins and has high hydrophobicity, the use of a single fiber made of polypropylene can improve the transfer of liquid to the skin.

  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, Even more preferably, it has a fineness of 1.3 dtex or more and 2.0 dtex or less, particularly preferably 1.4 dtex or more and 1.8 dtex or less. If the fineness is less than 1.2 dtex, the entanglement between the fibers becomes dense and the specific volume of the second fiber layer tends to be small. In addition, a fiber layer in which fibers having a 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 impregnated with a liquid. is there. Therefore, when the fineness of the hydrophobic fiber contained in the second fiber layer is too small, the desired liquid transferability may not be realized in the sheet. When the fineness of the hydrophobic fiber is too large, the sheet tends to have a hard touch. In addition, when hydrophobic fibers with too small fineness are used and the fibers are entangled by the fluid flow entanglement method, the fluid flow is difficult to pass through the fiber web, and the fibers may not be entangled uniformly. is there. In that case, fluff may easily occur in the nonwoven fabric.

  The second fiber layer contains 50% by mass or more of hydrophobic fibers, preferably 70% by mass or more, and more preferably 90% by mass or more. The second fiber layer may be composed of only hydrophobic fibers. If the proportion of hydrophobic fibers is small, the liquid transferability of the nonwoven fabric may be insufficient. When the second fiber layer includes fibers other than the hydrophobic fibers, the other fibers may be the hydrophilic fibers described above.

  The second fiber layer may include two or more different fibers as hydrophobic fibers. Two or more kinds of different hydrophobic fibers are a combination of two or more kinds of hydrophobic fibers having different degrees of hydrophobicity, or a combination of two or more kinds of synthetic fibers having different melting points of the thermoplastic resin constituting the fiber surface. It is. The second fiber layer may contain only one type of fiber as a hydrophobic fiber. In this case, the nonwoven fabric can be easily produced, and there is no inconvenience that the hydrophobicity of the second fiber layer is not uniform when two or more kinds of fibers are not mixed uniformly.

  The degree of hydrophobicity can be evaluated by, for example, the official moisture content described in relation to the hydrophilic fiber, or can be evaluated by the contact angle with water. The contact angle with water is determined by dropping water droplets (ion-exchanged water) on a non-woven fabric consisting only of fibers to be evaluated, taking a photo of the water droplet within 10 seconds after the water droplet touches the sample, It is calculated | required by measuring the interface angle with a nonwoven fabric. The greater the angle, the stronger the hydrophobicity of the fiber.

  The hydrophobicity of the fiber is determined by the material (eg, thermoplastic resin or hydrophobizing agent) present on the fiber surface. Therefore, as long as the above-mentioned fineness is obtained after forming the sheet, the hydrophobic fiber is not limited to a single fiber, but is a composite fiber made of a material having a surface and an interior different from each other, for example, a core-sheath type composite fiber, and sea islands. It may be a mold composite fiber. Alternatively, the hydrophobic fiber may be a fiber whose fiber surface is constituted by a plurality of substances, for example, a split type composite fiber. In that case, as long as the hydrophobicity of the whole fiber shows stronger hydrophobicity than the hydrophilic fiber contained in the first fiber layer, for example, a part of the surface of the hydrophobic fiber is more than the hydrophilic fiber. , May be composed of weakly hydrophobic components.

  When the hydrophobic fiber is a composite fiber composed of two or more components, the combination of two or more components can include a combination of a polyethylene resin / polyester resin and a polyethylene resin / polypropylene resin, Specifically, high density polyethylene / polyethylene terephthalate, low density polyethylene / polyethylene terephthalate, linear low density polyethylene / polyethylene terephthalate, ethylene-propylene copolymer / polyethylene terephthalate, polypropylene / polyethylene terephthalate, high density polyethylene / polytrileate. Methylene terephthalate, low density polyethylene / polytrimethylene terephthalate, linear low density polyethylene / polytrimethylene terephthalate, ethylene-propylene copolymer / poly It can be mentioned Li terephthalate, polypropylene / polytrimethylene terephthalate, high density polyethylene / polypropylene, a combination of such linear low density polyethylene / polypropylene.

  When the hydrophobic fiber is a composite fiber, in order to obtain stronger hydrophobicity, the polyolefin resin such as polyethylene resin and polypropylene resin should occupy at least a part of the fiber surface, preferably the entire fiber surface. It is preferable to dispose the above resin. Specifically, a core-sheath type composite fiber in which the polyolefin resin is a sheath component or a sea-island type composite fiber in which the polyolefin resin is a sea component is preferably used as the hydrophobic fiber.

  The fiber length of the fibers constituting 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. 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, and 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, and 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. The basis weight of the second fiber layer is preferably 5 g / m ² or more, more preferably 10 g / m ² or more, and particularly preferably 15 g / m ² or more. The basis weight of the second fiber layer is preferably 40 g / m ² or less, more preferably 30 g / m ² or less, and particularly preferably 25 g / m ² or less. The ratio of the basis weight of the first fiber layer to the basis weight of the second fiber layer is as described in relation to the first fiber layer, and is omitted here.

  The second fiber layer may be composed of 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 is composed of a layer a and a layer b. The layer a and the layer b include two types of hydrophobic fibers A and B having different degrees of hydrophobicity, respectively, and have a hydrophobic gradient. It may be formed. The second fiber layer may be composed of three or more layers using three or more types of hydrophobic fibers having different degrees of hydrophobicity.

(Other fiber layers)
Although the nonwoven fabric of this embodiment may consist only of a 1st fiber layer and a 2nd fiber layer, between the 1st fiber layer and the 2nd fiber layer, the fiber layer (henceforth "others"). May also be included). Another fiber layer is a layer which consists of a hydrophobic fiber with a small fineness whose fineness is less than 1.2 dtex, for example. The basis weight of the other fiber layer is preferably 5 g / m ² or more, more preferably 10 g / m ² or more, and particularly preferably 15 g / m ² or more. The basis weight of the other fiber layer is preferably 30 g / m ² or less, more preferably 25 g / m ² or less, and particularly preferably 20 g / m ² or less. 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, and most preferably 1.2 to 4.0. .

(Configuration of entire nonwoven fabric and method for producing nonwoven fabric)
The first fiber layer and the second fiber layer described above are integrated by entanglement of fibers, thermal bonding using thermal adhesiveness of constituent fibers, bonding with a solvent-based adhesive, bonding with a hot melt resin, or the like. To constitute a non-woven fabric. The nonwoven fabric of this embodiment is preferably integrated by entanglement of fibers. The fibers may be entangled by a known method, for example, by a needle punch method or a fluid flow entanglement method in which a high-pressure fluid (particularly water) is jetted onto the fiber web. In the nonwoven fabric of this embodiment, it is preferable that the fibers are entangled and integrated by the hydroentanglement method. This is because according to the hydroentanglement method, a soft nonwoven fabric having a good tactile sensation can be obtained.

  In the nonwoven fabric of this embodiment, when the hydrophobic fiber contained in the second fiber layer is a synthetic fiber made of a thermoplastic resin, the fibers may be bonded to each other by the hydrophobic fiber. By bonding the fibers, fuzz can be suppressed in the obtained nonwoven fabric, the appearance of the nonwoven fabric can be improved, and the tactile feel of the nonwoven fabric can be made smooth. Adhesion with hydrophobic fibers can be achieved by heating the low-melting-point component when the hydrophobic fiber is partly or entirely made of a component having a relatively low melting point (low-melting-point component) such as polyethylene. You may implement by the method of melting or softening and forming a heat bonding part. Alternatively, the bonding may be performed by irradiation with an electron beam or ultrasonic welding.

The basis weight of the whole nonwoven fabric is appropriately selected in consideration of the amount of liquid impregnation and the like according to the skin site to be coated. The basis weight of the entire nonwoven fabric may be, for example, 25 g / m ² or more, particularly 35 g / m ² or more, more particularly 40 g / m ² or more, and more particularly 50 g / m ² or more. The basis weight of the nonwoven fabric may be, for example, 120 g / m ² or less, particularly 90 g / m ² or less, more particularly 75 g / m ² or less, and more particularly 70 g / m ² or less. If the basis weight is too small, the amount of liquid that can be impregnated into the nonwoven fabric decreases, and a predetermined amount of liquid may not be supplied to the skin. If the basis weight is too large, it is difficult to fit the sheet on the curved surface of the skin. Skin adhesion may be reduced.

When the nonwoven fabric is used as a sheet for covering the face, that is, the face mask substrate, the basis weight of the entire nonwoven fabric is preferably 25 g / m ² or more, more preferably 35 g / m ² or more, and even more preferably 40 g / m ^2. m ² or more, particularly preferably 50 g / m ² or more. Further, the basis weight of the whole nonwoven fabric for the face mask substrate is preferably 120 g / m ² or less, more preferably 90 g / m ² or less, further preferably 75 g / m ² or less, particularly preferably 70 g / m ² or less. Good. When the basis weight of the nonwoven fabric is less than 25 g / m ² when used as a face mask substrate, the amount of liquid that can be impregnated into the nonwoven fabric is reduced, and sufficient liquid may not be supplied to the face. When the basis weight of the nonwoven 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 nonwoven fabric is, for example, 0.04 mm or more, preferably 0.60 mm or more, more preferably 0.70 mm or more, and most preferably 0.80 mm or more. Further, the thickness of the whole nonwoven fabric is preferably 1.5 mm or less, more preferably 1.3 mm or less, and most preferably 1.1 mm or less. If the thickness of the entire nonwoven fabric is too small, the amount of liquid that can be impregnated into the nonwoven fabric decreases, and a predetermined amount of liquid may not be supplied to the skin. When the thickness of the whole nonwoven fabric is too large, it is difficult for the sheet to follow the curved surface of the skin, and the adhesion of the sheet to the skin may be reduced. In addition, the thickness of the whole nonwoven fabric said here points out what was measured in the state which added the load of 3g per 1 cm < ² > of nonwoven fabric.

The density of the entire nonwoven fabric is preferably 0.085 g / cm ³ or less, more preferably 0.080 g / cm ³ or less, most preferably 0.075 g / cm ³ or less. Further, 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 nonwoven fabric is too large or too small, the amount of liquid that can be impregnated into the nonwoven fabric decreases, and a predetermined amount of liquid may not be supplied to the skin, or the sheet is difficult to follow the curved surface of the skin. The adhesion of the sheet to the skin may be reduced. In addition, the density of the whole nonwoven fabric said here is calculated | required from the fabric weight of the whole nonwoven fabric, and the thickness of the whole nonwoven fabric, and the thickness of the whole nonwoven fabric was measured in the state which applied the load of 3g per 1 cm < ² > of nonwoven fabric. Point to.

Nonwoven, the whole was measured while applying a load of 1 cm ² per 3g thickness (3g thickness) to the thickness of the entire measured while applying a load of 1 cm ² per 20 g (20 g in thickness) The ratio (3 g thickness / 20 g thickness) is preferably 1.10 or more, more preferably 1.20 or more. Further, the 3 g thickness / 20 g thickness of the nonwoven fabric is preferably 1.50 or less.
When the nonwoven fabric has a 3 g thickness / 20 g thickness within this range, for example, when a sheet in a state of covering the skin is pressed, the thickness of the second fiber layer is easily reduced, The liquid moves to the first fiber layer, and more liquid easily moves from the first fiber layer to the skin.

  The nonwoven fabric is formed by laminating a fiber web to be a first fiber layer (hereinafter also referred to as “first fiber web”) and a fiber web to be a second fiber layer (hereinafter also referred to as “second fiber web”), The process which arrange | positions the fiber web used as another fiber layer (henceforth "other fiber web") between a 1st fiber web and a 2nd fiber web as needed, and integrates a fiber web. It can manufacture by attaching to. Examples of the process for integrating the fiber web include entanglement process between fibers, thermal bonding process, bonding process using a solvent-based adhesive, bonding process by irradiation with an electron beam, ultrasonic welding, and bonding process using a hot melt resin. is there. It is preferable that the nonwoven fabric of this embodiment is manufactured by integrating fiber webs by a process of entanglement of fibers. The process of entanglement of fibers is, for example, a needle punch process or a fluid flow (particularly water flow) entanglement process.

  Any fiber web may have any form selected from a parallel web, a cross web, a card web such as a semi-random web and a random web, an air lay web, a wet papermaking web, and a spunbond web. . The form of each fiber web may be the same or different. Each fibrous web is preferably a parallel web. Parallel webs are highly productive and tend to give a nonwoven fabric that is bulky and has a large specific volume. Moreover, since a soft nonwoven fabric is easily obtained when a parallel web is used, a liquid-impregnated skin-covering sheet produced using the parallel web is also soft and tends to have an excellent texture.

  When the fibers are entangled by the hydroentanglement process, the hydroentanglement process is performed by placing a fibrous web laminate on a support and jetting a columnar water stream. For example, the support is preferably a plain weave support of 80 mesh or more and 100 mesh or less. Hydroentanglement treatment is performed by laminating fiber webs with a water flow of 1 MPa or more and 15 MPa or less 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. You may carry out by injecting 1 to 5 times each on the front and back of the body. 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 moisture and used as it is as a base material for the sheet. When the second fiber layer includes a synthetic fiber in which a part or all of the fiber surface is occupied by a thermoplastic resin having a relatively low melting point as a hydrophobic fiber, the fibers are thermally bonded to each other by the hydrophobic fiber. It is preferable to subject to heat bonding treatment. The thermal bonding treatment is preferably performed at a temperature at which the resin forming the fiber surface of the hydrophobic fiber melts or softens. When the entanglement process is a hydroentanglement process, the thermal bonding process may also serve as a drying process for removing moisture from the fiber web. Alternatively, the thermal bonding process and the drying process may be performed separately.

  For example, when the second fiber layer includes a synthetic fiber having a fiber surface made of polyethylene as a hydrophobic fiber, the thermal bonding treatment is preferably performed at a temperature of 130 ° C. or higher and 150 ° C. or lower. By adjusting the heat treatment temperature, the degree of thermal adhesion by the low melting point component can be changed. The degree of thermal bonding affects the strength, flexibility, and touch of the nonwoven fabric.

  The thermal bonding treatment may be performed by a known method. Specifically, a hot air penetration type heat treatment machine (also called an air through type heat processing machine), a hot air blowing type heat treatment machine, an infrared heat treatment machine, or a hot roll (heat (Including embossing rolls). Of these, 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 coating sheet)
The nonwoven fabric of this embodiment constitutes a liquid-impregnated skin coating sheet by impregnating it with a liquid. The liquid to be impregnated and the amount of impregnation 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 decollete sheet, a liquid containing an active ingredient (for example, a cosmetic) is 600 parts by mass with respect to 100 parts by mass of the nonwoven fabric. Impregnation may be carried out with an impregnation amount of not less than 2500 parts by mass and more preferably not less than 600 parts by mass and not more than 1500 parts by mass, more particularly impregnation with an impregnation amount of not less than 700 parts by mass and not more than 1500 parts by mass. It's okay. Examples of the active ingredient include, but are not limited to, a moisturizing ingredient, a keratin softening ingredient, a cleansing ingredient, an antiperspirant ingredient, an aroma ingredient, a whitening ingredient, a blood circulation promoting ingredient, an ultraviolet ray preventing ingredient, and a slimming ingredient. .

  The face mask has a shape suitable for covering the face, and further, for example, in a form in which openings or notches by punching are provided as necessary in portions corresponding to eyes, nose and mouth. Provided. Alternatively, the face mask may have a shape that covers only a part of the face (for example, the eyes, mouth, nose or cheek). Alternatively, the face mask may be provided as a set of sheets covering the periphery of the eyes and a sheet covering the periphery of the mouth, or may be provided as a set of sheets covering three or more portions separately.

  A keratin care sheet is a skin-covering sheet used for heels, elbows, knees, etc., which are thick and easily cured, and impregnated with a liquid containing keratin softening and moisturizing ingredients to moisturize and soften the keratin. It is a sheet that promotes the removal of excess keratin and the sheet that promotes the removal of excess keratin. The nonwoven fabric of this embodiment can be used as a base material in a keratin care sheet that exhibits any effect / efficacy. A keratin care sheet, for example, a keratin care sheet for wrinkles, has an opening formed by cutting and / or notching and / or part of the sheet so that the sheet can be easily fitted to the wrinkle curve. Is provided in a form having

  A liquid-impregnated skin-covering sheet is a moisturizing ingredient or used to moisturize or otherwise care for any part of the body (eg neck, back of hand, neck-to-chest part (also called decollete)) It may be a moisturizing sheet impregnated with a liquid containing other active ingredients. Alternatively, the liquid-impregnated skin coating 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.

  In any form of the sheet, the first fiber layer is used in contact with the skin. Therefore, the second fiber layer is not in contact with the skin and is exposed to the external environment. Since the second fiber layer is hydrophobic, the liquid is more likely to move from the second fiber layer to the hydrophilic first fiber layer rather than evaporating to the external environment, and the liquid that has moved to the first fiber layer is Furthermore, it will move to the skin. Moreover, the liquid which moved to the 1st fiber layer becomes a film | membrane form on the skin surface, and plays the role which adhere | attaches a sheet | seat on skin favorably.

Hydrophilic fiber 1 (indicated as “Cotton” in the table): Cotton having a fineness of 1.0 to 5.0 dtex, fiber length of 10 to 60 mm Hydrophobic fiber 1 (indicated in the table as “PP single”): 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 (shown as “PET single” in the table): Single fiber made of polyethylene terephthalate with 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” in the table): core having a fineness of 1.7 dtex, a fiber length of 51 mm, polypropylene (melting point: 167 ° C.) as a core component, and polyethylene (melting point: 138 ° C.) as a sheath component Sheath type composite fiber (trade name HR-NTW, manufactured by Toray Industries, Inc.)
Hydrophobic fiber 4 (shown as “PP single thick” in the table): Single fiber made of polypropylene having a fineness of 2.2 dtex and a fiber length of 51 mm (melting point: 163 ° C., trade name: PN, manufactured by Daiwabo Polytech Co., Ltd.)
Hydrophobic fiber 5 (shown as “PP single fine” in the table): a single fiber made of polypropylene having a fineness of 1.0 dtex and a fiber length of 38 mm (melting point: 163 ° C., trade name: PN, manufactured by Daiwabo Polytech Co., Ltd.)

(Test 1)
(Examples 1-3, Comparative Examples 1-2)
The first fiber web with the target weight shown in Table 1 is produced only with the hydrophilic fiber 1 (cotton), and the second fiber web with the target weight shown in Table 1 is prepared using the hydrophobic fibers of the type shown in Table 1. Was made. Both the first fiber web and the second fiber web were produced using a parallel card machine. Note that the basis weight of the actually manufactured web does not always match the target basis weight and has an error (the same applies to the following tests).

  A laminated web having a two-layer structure in which the first fiber web and the second fiber web were laminated, or only the first fiber web, was placed on the support, and the web was hydroentangled to interlace the fibers. In the hydroentanglement treatment, a columnar water flow of 3.0 MPa is jetted twice on one surface of a web using a nozzle having an orifice having a hole diameter of 0.1 mm provided at intervals of 0.6 mm, and 4.0 MPa is applied to the other surface. A columnar water stream was jetted twice. Then, the drying process was performed and the nonwoven fabric was obtained.

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

(Evaluation of liquid transferability)
A sample obtained by cutting the obtained non-woven fabric so as to have dimensions of 150 mm in the vertical direction (machine direction) and 70 mm in the horizontal direction (width direction) was prepared, and 100 parts by mass of the sample was impregnated with 700 parts by mass of water. . The sample impregnated with water was placed on a Kim towel (trade name) whose mass was measured in advance. The sample was placed on the Kim towel so that the first fiber layer was in contact with the Kim towel. The sample was left on the Kim Towel for 10 minutes and the mass of the Kim Towel after being left was measured. The increase in the mass of the Kim Towel after 10 minutes is taken as the amount of water transferred from the sample to the Kim Towel, and the ratio of the amount of transferred water to the mass of the impregnated liquid is determined as a percentage. evaluated.
In Test 1, the liquid transferability was evaluated under the conditions of a temperature of 19.3 ° C. and a humidity of 60%.
Table 1 shows the evaluation results of liquid transferability.

  Examples 1 to 3 all showed good liquid transferability. Both the non-woven fabric (Comparative Example 1) consisting only of hydrophilic fibers and the non-woven fabric (Comparative Example 2) consisting of hydrophobic fibers having a small second fineness were low in liquid transferability.

(Test 2)
(Examples 4-7, Comparative Example 3)
The first fiber web having the target weight shown in Table 2 is produced only with the hydrophilic fiber 1 (cotton), and the second fiber web having the target weight shown in Table 2 is formed using the hydrophobic fibers of the type shown in Table 2. Was made. Both the first fiber web and the second fiber web were produced using a parallel card machine.

  A laminated web having a two-layer structure in which the first fiber web and the second fiber web were laminated, or only the first fiber web, was placed on the support, and the web was subjected to hydroentanglement treatment to entangle the fibers. In the hydroentanglement treatment, a columnar water flow of 3.0 MPa is jetted twice on one surface of a web using a nozzle having an orifice having a hole diameter of 0.1 mm provided at intervals of 0.6 mm, and 4.0 MPa is applied to the other surface. A columnar water stream was jetted twice. Then, the drying process was performed and the nonwoven fabric was obtained.

The basis weight and thickness of the nonwoven fabrics obtained in Examples 4 to 7 and Comparative Example 3 were measured. The measurement method is as described above. The measurement results are shown in Table 2.
Moreover, the liquid transferability of the nonwoven fabric obtained in Examples 4 to 7 and Comparative Example 3 was evaluated by the same method as described in connection with Test 1. However, the evaluation was performed under conditions of a temperature of 20.4 ° C. and a humidity of 58%. Table 2 shows the evaluation results of liquid transferability. It should be noted that the evaluation of the liquid transferability in Test 2 was performed in an environment different from that in Test 1, and thus the value shown as the evaluation result is different from that in Test 1.

  Examples 4 to 6 all showed good liquid transferability. From the liquid migration measurement results of Examples 4 and 6, it was found that even when the basis weight of the second fiber layer is small, the liquid migration of the nonwoven fabric can be improved.

  When the nonwoven fabric of this embodiment is impregnated with a liquid and used when the first fiber layer is in contact with the skin, the liquid easily moves to the skin, so that the liquid tends to stay on the skin, thereby providing good adhesion. It is useful as a base material for face masks and the like because it can ensure the effect of the liquid on the skin.

Claims (8)

A first fiber layer containing 50% by mass or more of hydrophilic fibers having a fiber length of 1 mm to 100 mm, and a hydrophobic fiber that is more hydrophobic than the hydrophilic fibers contained in the first fiber layer and has a fiber length of 1 mm to 100 mm A second fiber layer containing 50% by mass or more, wherein the first 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,
A nonwoven fabric for liquid-impregnated skin-covering sheet, wherein the first fiber layer is used in contact with the skin.   The nonwoven fabric for liquid-impregnated skin-covering sheet according to claim 1, wherein the second fiber layer includes a polyolefin-based fiber in which a polyolefin-based resin forms part or all of the fiber surface as the hydrophobic fiber.   The nonwoven fabric for liquid-impregnated skin-covering sheets according to claim 2, wherein the polyolefin fibers are single fibers made of polypropylene.   The nonwoven fabric for liquid-impregnated skin-covering sheets according to any one of claims 1 to 3, wherein the fibers are bonded together by the hydrophobic fibers.   The liquid-impregnated skin-covering sheet according to claim 4, wherein the hydrophobic fiber is a core-sheath type composite fiber having polyethylene as a sheath component and polypropylene as a core component, and the fibers are bonded to each other by the sheath component. Non-woven fabric.   The nonwoven fabric for liquid-impregnated skin-covering sheets according to any one of claims 1 to 5, wherein the hydrophobic fibers have a fineness of 3.5 dtex or less.   A liquid-impregnated skin-coated sheet obtained by impregnating the nonwoven fabric according to any one of claims 1 to 6 with 600 to 2500 parts by mass of a liquid.   A face mask obtained by impregnating the nonwoven fabric according to any one of claims 1 to 6 with 600 parts by mass or more and 2500 parts by mass or less of a liquid.