JP7374405B2 - Non-woven fabric for liquid-impregnated skin covering sheets and liquid-impregnated skin covering sheets - Google Patents

Description

The present disclosure relates to a nonwoven fabric impregnated with a liquid, particularly a cosmetic, as a base material for a liquid-impregnated skin coating sheet, and a liquid-impregnated skin coating sheet using the nonwoven fabric.

BACKGROUND ART Various liquid-impregnated sheets have been proposed and put into practical use, and are used to cover the skin of a human body or an animal to apply a predetermined substance to the skin of the human body or animal. Specifically, examples include liquid-impregnated skin covering sheets (face masks, keratin care sheets used for heels, elbows, knees, etc.) impregnated with liquids containing active ingredients (for example, cosmetics). Nonwoven fabrics are generally used as the base material for liquid-impregnated skin coating sheets. Liquid-impregnated skin covering sheets are often used in close contact with the skin for relatively long periods of time, so various nonwoven fabrics have been proposed as base materials from the viewpoints of adhesion, liquid release, texture, and convenience. ing.

Japanese Patent Application Publication No. 2003-166161 Japanese Patent Application Publication No. 2016-37674

One aspect of the present embodiment is to provide a liquid-impregnated nonwoven fabric for a skin covering sheet that exhibits better tactile sensation even when impregnated with a low-viscosity liquid, and has excellent conformability to curved surfaces and bulk changeability. The purpose is to Another object of the present embodiment is to provide a liquid-impregnated skin covering sheet, especially a face mask, in which the nonwoven fabric is impregnated with a liquid.

In the first aspect, the present embodiment is a nonwoven fabric for a liquid-impregnated skin covering sheet comprising a first cellulosic fiber, a second cellulosic fiber, and an adhesive fiber,
The nonwoven fabric has a single layer structure,
The fineness of the first cellulose fiber is 1.4 dtex or more and 2.0 dtex or less,
The fineness of the second cellulose fiber is 0.5 dtex or more and 1.0 dtex or less,
The nonwoven fabric contains 5% by mass or more and 20% by mass or less of the adhesive fiber,
In the nonwoven fabric, the fibers are bonded to each other by adhesive fibers,
The number of fibers constituting the nonwoven fabric per unit basis weight of the nonwoven fabric is 150,000 or more and 400,000 or less,
A nonwoven fabric for a liquid-impregnated skin covering sheet is provided.

In the second aspect, the present embodiment provides a liquid-impregnated skin-covering sheet, which is obtained by impregnating the liquid-impregnated nonwoven fabric for skin-covering sheets according to the first aspect with a liquid.

The nonwoven fabric of this embodiment provides a liquid-impregnated skin coating sheet that exhibits a good feel to the touch even when impregnated with a liquid having a relatively low viscosity. Furthermore, the nonwoven fabric of this embodiment has excellent conformability to curved surfaces and better bulk changeability. Therefore, for example, when the nonwoven fabric of this embodiment is used for application to the skin, such as a face mask, gaps are unlikely to form between the nonwoven fabric and the skin even in areas with many irregularities such as the face. Moreover, the nonwoven fabric of this embodiment can provide a liquid-impregnated skin covering sheet in which the impregnated liquid is appropriately released to the skin when the sheet is pressed by hand.

(How this embodiment was arrived at)
There are various types of liquids that can be impregnated into a liquid-impregnated skin coating sheet (hereinafter also simply referred to as a "sheet"), and liquids with relatively low viscosity are sometimes used. The tactile sensation when a sheet impregnated with a low-viscosity liquid is applied to the skin is easily influenced by the tactile sensation of the nonwoven fabric. In other words, when a nonwoven fabric is impregnated with a highly viscous liquid, the liquid tends to stay on the surface of the sheet and clings to the surface of the nonwoven fabric, making it difficult for the nonwoven fabric to come into direct contact with the skin, and the tactile feel of the nonwoven fabric itself affects the tactile feel of the sheet. Sometimes there isn't. On the other hand, low-viscosity liquids do not stay on the surface of the sheet but are easily taken into the interior of the sheet, making it difficult for a liquid film to form on the surface of the sheet, and the texture of a sheet impregnated with such a liquid is It is greatly affected by the texture of nonwoven fabrics.

The present inventors conducted studies to obtain a nonwoven fabric that provides a good texture even when impregnated with a low viscosity liquid. First, as a method to improve the feel of a nonwoven fabric, there is a method of reducing the fineness of the constituent fibers, so we considered using fibers with a small fineness (low-fineness fibers). However, as the fineness of the fibers decreases, the voids between the fibers decrease and the bulk changeability of nonwoven fabrics (the property of decreasing thickness when force is applied in the thickness direction) tends to decrease. This tendency becomes more pronounced when fibers are used. As the voids between the fibers become smaller and the bulk changeability of the nonwoven fabric decreases, less liquid is retained in the voids between the fibers, which may result in less liquid being released when the nonwoven fabric is pressed. . If the amount of liquid released is small, the user may feel that not enough liquid is being delivered to the skin.

Cellulose fibers are widely used as constituent fibers of nonwoven fabrics for sheets because they impart water absorbency to nonwoven fabrics and serve to retain liquid. In addition, among cellulose fibers, recycled fibers in particular are produced industrially, have less variation compared to cotton, etc., and are advantageous in terms of cost, so they are suitable for constructing nonwoven fabrics for sheets. Are suitable. The present inventors also studied the structure of the sheet on the premise of using cellulose fibers, especially recycled fibers, and in order to obtain a nonwoven fabric with good bulk changeability while taking advantage of the good feel of cellulose fibers with low fineness. Further consideration was given.

As a result, two types of cellulose fibers with different finenesses are used, these fineness ranges are specified, the fibers are bonded together with adhesive fibers, and the number of constituent fibers per unit basis weight of the nonwoven fabric is set within a specified range. It was discovered that a nonwoven fabric having good texture and bulk changeability can be obtained by this, and the present embodiment was developed. In this embodiment, the fineness of the two types of cellulose fibers is defined as 1.4 dtex or more and 2.0 dtex or less and 0.5 dtex or more and 1.0 dtex or less, respectively, and the number of fibers constituting the nonwoven fabric per unit basis weight is 150,000 or more and 400,000. It is less than this book. As a result, a predetermined proportion of cellulose fibers with a small fineness is included to provide a good tactile sensation, and the cellulose fibers with a large fineness improve the bulk changeability of the nonwoven fabric.

More specifically, the nonwoven fabric of the present embodiment is a nonwoven fabric for a liquid-impregnated skin covering sheet that includes first cellulosic fibers, second cellulosic fibers, and adhesive fibers, and includes:
The nonwoven fabric has a single layer structure,
The fineness of the first cellulose fiber is 1.4 dtex or more and 2.0 dtex or less,
The fineness of the second cellulose fiber is 0.5 dtex or more and 1.0 dtex or less,
The nonwoven fabric contains 5% by mass or more and 20% by mass or less of the adhesive fiber,
In the nonwoven fabric, the fibers are bonded to each other by adhesive fibers,
The number of fibers constituting the nonwoven fabric per unit basis weight of the nonwoven fabric is 150,000 or more and 400,000 or less,
This is a nonwoven fabric for liquid-impregnated skin covering sheets. Hereinafter, the fibers constituting the nonwoven fabric of this embodiment will be explained first.

(First and second cellulose fibers)
The nonwoven fabric of this embodiment includes first and second cellulose fibers as two types of cellulose fibers having different finenesses. Specifically, cellulose fibers are
(1) Regenerated fibers such as viscose rayon, cupro, and solvent-spun cellulose fibers (e.g., Lenzing Glyocel® and Tencel®);
(2) cellulose-based semi-synthetic fibers such as acetate and triacetate;
(3) Pulp such as mechanical pulp, recycled pulp and chemical pulp,
(4) Plant-based natural fibers such as cotton and hemp.
Cellulose fibers have higher water absorption than synthetic fibers and the like, so they are suitable for forming nonwoven fabrics for sheets.

The first and second cellulose fibers may be the same or different, as long as their fineness is within a predetermined range. For example, both the first cellulosic fiber and the second cellulosic fiber may be viscose rayon. Alternatively, the first cellulose fiber may be viscose rayon, and the second cellulose fiber may be solvent spun cellulose fiber. Alternatively, the first cellulose fiber may be cotton and the second cellulose fiber may be viscose rayon. In addition, in this embodiment, two or more types of cellulose fibers may be included as the first cellulose fibers, and/or two or more types of cellulose fibers may be included as the second cellulose fibers. May contain fiber.

Both the first and second cellulosic fibers may be recycled fibers. Regenerated fibers are preferably used because the fineness can be easily adjusted and the variation is small. Among the recycled fibers, viscose rayon is particularly preferably used because it is advantageous in terms of cost.

The first cellulose fiber has a fineness of 1.4 dtex or more and 2.0 dtex or less. The fineness of the first cellulose fiber may be particularly 1.4 dtex or more and 1.8 dtex or less, and more particularly 1.5 dtex or more and 1.7 dtex or less. If the fineness of the first cellulose fiber is less than 1.4 dtex, a nonwoven fabric with good bulk changeability may not be obtained, and if it exceeds 2.0 dtex, the feel of the nonwoven fabric may be deteriorated.

The second cellulose fiber has a fineness of 0.5 dtex or more and 1.0 dtex or less. The fineness of the second cellulose fibers may particularly be 0.6 dtex or more and 0.9 dtex or less, and more particularly 0.6 dtex or more and 0.7 dtex or less. If the fineness of the second cellulose fiber is less than 0.5 dtex, it may cause neps in the nonwoven fabric, which may affect the texture; if it exceeds 1.0 dtex, the surface of the nonwoven fabric will be rough and the texture will be may decrease.

The fiber lengths of the first and second cellulose fibers are not particularly limited, and may be appropriately selected depending on the method of manufacturing the nonwoven fabric and the like. For example, if the nonwoven fabric is manufactured by creating a carded web, the first and second cellulosic fibers may be staple fibers. The fiber length of the short fibers may be, for example, 20 mm or more and 100 mm or less, particularly 28 mm or more and 75 mm or less, and more particularly 30 mm or more and 65 mm or less. Alternatively, when the nonwoven fabric is manufactured by an air-lay method, the fiber length may be, for example, 2 mm or more and 20 mm or less. The first and second cellulosic fibers may be of the same fiber length or may be of different fiber lengths. Furthermore, in this embodiment, the first cellulose fibers may include a plurality of fibers with different fiber lengths, and/or the second cellulose fibers may include a plurality of fibers with different fiber lengths. good.

(Adhesive fiber)
The nonwoven fabric of this embodiment contains adhesive fibers in a proportion (a proportion of 5% by mass or more and 20% by mass or less) to be described later. Adhesive fibers serve to bond fibers together in a nonwoven fabric, improve the strength of the nonwoven fabric, and suppress elongation of the nonwoven fabric. Adhesive fibers are generally synthetic fibers made of thermoplastic resin, and are heat-adhesive fibers that exhibit adhesive properties when heated; however, as long as they have adhesive properties, they do not need to be heat-adhesive; It may be made of materials other than synthetic fibers.

When the adhesive fibers are synthetic fibers, the synthetic fibers include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate, and copolymers thereof; polypropylene; Polyethylene (including high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, propylene copolymer whose main component is propylene (propylene-ethylene copolymer, propylene-butene-1-ethylene) polyolefin resins such as ethylene-vinyl alcohol copolymers, and ethylene-vinyl acetate copolymers; polyamide resins such as nylon 6, nylon 12, and nylon 66; acrylic resins; polycarbonates, It may consist of one or more thermoplastic resins arbitrarily selected from engineering plastics such as polyacetal, polystyrene, and cyclic polyolefins, and elastomers thereof.

Synthetic fibers may be single fibers consisting of a single component (also referred to as a "single section") and/or composite fibers consisting of multiple components (also referred to as "sections"). The conjugate fiber may be, for example, a concentric or eccentric core-sheath type conjugate fiber, an island-in-the-sea type conjugate fiber, a side-by-side type conjugate fiber, a split type conjugate fiber, or the like. The cross section of the fibers may be circular or non-circular, and examples of non-circular shapes include elliptical, Y-shaped, X-shaped, square, multilobal, polygonal, and star-shaped. Moreover, the synthetic fiber may have a hollow cross section. In both cases of single fibers and composite fibers, each section constituting the fiber may be made of one type of resin, or may be a mixture of two or more types of resin.

When the synthetic fiber is a single fiber, the single fiber is made of one or more resins selected from the group consisting of the above polyolefin resin, the above polyester resin, the above polyamide resin, and the above acrylic resin. It may be. More specifically, polyethylene single fibers, polypropylene single fibers, polyethylene terephthalate single fibers, etc. may be used.

When the synthetic fiber is a composite fiber, two or more components may be arranged so that the thermoplastic resin with the lowest melting point constitutes a part of the fiber surface. In that case, in the process of producing a nonwoven fabric, when heat is applied under conditions such that a component made of a thermoplastic resin with the lowest melting point (hereinafter referred to as "low melting point component") melts or softens, the low melting point component becomes an adhesive component. The combination of resins (first/second) constituting the composite fiber consisting of a first component that is a thermoplastic resin with a higher melting point and a second component that is a thermoplastic resin with a lower melting point is, for example, polyethylene terephthalate. Combinations of polyester resins and polyolefin resins such as polyethylene, polyethylene terephthalate/polypropylene, and polyethylene terephthalate/propylene copolymers, and two types of polyolefin resins such as polypropylene/polyethylene/ and polypropylene/propylene copolymers. These are a combination of thermoplastic resins and two types of polyester resins with different melting points.

The thermoplastic resin illustrated as a component of the single fiber or composite fiber may contain other components as long as it contains 50% by mass or more of the specifically indicated thermoplastic resin. The specifically indicated thermoplastic resin may contain 80% by weight or more, may contain 90% by weight or more, or the constituent consists essentially of the specifically indicated thermoplastic resin. good. The term "substantially" is used here in consideration of the fact that thermoplastic resins usually contain various additives and the like. For example, in the combination of polyethylene terephthalate/polyethylene, "polyethylene" may contain other thermoplastic resins, additives, etc. as long as it contains 50% by mass or more of polyethylene. This also applies to the following examples.

When the synthetic fiber is a concentric or eccentric core-sheath type composite fiber in which a thermoplastic resin with a higher melting point constitutes the core component as the first component, and a thermoplastic resin with a lower melting point constitutes the sheath component as the second component. , core/sheath combinations such as polypropylene/polyethylene, polypropylene/propylene-ethylene copolymer, polypropylene/propylene-butene-1-ethylene copolymer, polyethylene terephthalate/polyethylene, polyethylene terephthalate/polypropylene, polyethylene terephthalate/propylene It may be a copolymer, polytrimethylene terephthalate/polyethylene, polybutylene terephthalate/polyethylene, polyethylene terephthalate/copolyester (for example, polyethylene terephthalate copolymerized with isophthalic acid).

In the case of core-sheath type composite fibers, the composite ratio of the core component and sheath component (core component:sheath component) is preferably 80:20 to 20:80 in volume ratio, and 70:30 to 30:70. The ratio is more preferably 60:40 to 40:60.

In this embodiment, a core-sheath composite fiber (concentric or eccentric) in which the first component/second component combination is polyethylene terephthalate/copolyester, polypropylene/polyethylene, or polyethylene terephthalate/polyethylene is used as the adhesive fiber. It can be preferably used. These fibers are preferably used because they exhibit adhesive properties at relatively low temperatures (110° C. or higher and 130° C. or lower) and make the texture of the nonwoven fabric soft after bonding. In particular, the combination of polyethylene terephthalate/copolyester Even if the mixing ratio is small, it is preferable because the fibers can be bonded well to each other and elongation of the nonwoven fabric can be suppressed, and the mixing ratio of the first cellulosic fiber and the second cellulosic fiber can be increased.

The fineness of the adhesive fiber may be, for example, 1.0 dtex or more and 4.0 dtex or less, particularly 1.5 dtex or more and 2.5 dtex or less, more particularly 1.6 dtex or more and 2.4 dtex or less, and even more. In particular, it may be 1.7 dtex or more and 2.2 dtex or less. If the fineness of the adhesive fiber is too small, the strength of the nonwoven fabric will be low and the nonwoven fabric may tend to elongate; if it is too large, the nonwoven fabric may have a hard feel. If the nonwoven fabric tends to stretch, for example, when the nonwoven fabric is used as a face mask, openings provided at the positions of the eyes and mouth may become misaligned.

The fiber length of the adhesive fibers is not particularly limited, and may be appropriately selected depending on the method of manufacturing the nonwoven fabric. For example, if the nonwoven fabric is manufactured by creating a carded web, the adhesive fibers may be staple fibers. The fiber length of the short fibers may be, for example, 20 mm or more and 100 mm or less, particularly 28 mm or more and 75 mm or less, and even more particularly 30 mm or more and 65 mm or less. Alternatively, when the nonwoven fabric is manufactured by an air-lay method, the fiber length may be, for example, 2 mm or more and 20 mm or less.

(other fibers)
The nonwoven fabric of this embodiment may contain fibers other than the first and second cellulose fibers and adhesive fibers. Other fibers may be protein fibers such as silk and wool, for example.

Alternatively, the other fibers may be synthetic fibers that do not function as adhesive fibers. Specifically, when synthetic fibers that exhibit adhesive properties when heated at T°C are used as adhesive fibers, synthetic fibers that have a melting point higher than T°C and do not exhibit adhesive properties when heated at T°C are used. Fibers may be included as other fibers. Therefore, whether a certain synthetic fiber is included as an adhesive fiber or another fiber is determined by the synthetic fibers that are also included in the nonwoven fabric, and some synthetic fibers may be included as adhesive fibers or others. , may also be included as other fibers.

For example, when a core-sheath composite fiber consisting of polyester (core)/polypropylene (sheath) is used together with a core-sheath composite fiber consisting of a combination of polypropylene (core)/polyethylene (sheath), polyethylene is heated at the lowest temperature. It will be included as another fiber to exhibit adhesive properties. On the other hand, when this is used with a splittable composite fiber consisting of a combination of polyethylene terephthalate/nylon 6, polypropylene is included as an adhesive fiber since it exhibits thermal adhesive properties at the lowest temperature.

The fineness of the other fibers may be, for example, 1.0 dtex or more and 4.0 dtex or less, particularly 1.4 dtex or more and 2.5 dtex or less, and more particularly 1.5 dtex or more and 2.2 dtex or less. If the fineness of the other fibers is too small, it may cause neps in the nonwoven fabric, which may affect the texture; if it is too large, the surface of the nonwoven fabric may become rough, which may reduce the feel.

The fiber lengths of the other fibers are not particularly limited, and may be appropriately selected depending on the method of manufacturing the nonwoven fabric. For example, if the nonwoven fabric is manufactured by creating a carded web, the other fibers may be short fibers. The fiber length of the short fibers may be, for example, 20 mm or more and 100 mm or less, particularly 28 mm or more and 75 mm or less, and more particularly 30 mm or more and 65 mm or less. Alternatively, when the nonwoven fabric is manufactured by an air-lay method, the fiber length may be, for example, 2 mm or more and 20 mm or less.

(Composition of nonwoven fabric)
The nonwoven fabric of this embodiment is a single-layer nonwoven fabric containing first cellulose fibers, second cellulose fibers, and adhesive fibers, and the fibers are bonded to each other by the adhesive fibers.
As mentioned above, the first cellulosic fibers have a larger fineness and together with the adhesive fibers ensure the strength of the nonwoven fabric. The first cellulosic fiber also secures interfiber voids in the nonwoven fabric, imparts bulk changeability to the nonwoven fabric, provides good liquid release properties when the nonwoven fabric is pressed, and provides a soaking feeling. do better The second cellulosic fiber has a smaller fineness and makes the surface of the nonwoven fabric dense, has a high surface resistance, and has less irregularities, thereby improving the feel of the nonwoven fabric.

The nonwoven fabric of this embodiment has a single layer structure, and the above three types of fibers are almost uniformly mixed in the nonwoven fabric. A nonwoven fabric having such a structure is advantageous in that it is easy to reduce the basis weight, and there is no need for consumers to be concerned about the front and back sides.

In the nonwoven fabric of this embodiment, the proportion of adhesive fibers is 5% by mass or more and 20% by mass or less. By setting the proportion of adhesive fibers within this range, the strength of the nonwoven fabric can be ensured and elongation can be suppressed. If the proportion of adhesive fibers is too large, the volume of fiber adhesion points will increase and/or the number of fiber adhesion points will increase, which may make the nonwoven fabric hard to the touch, and the surface of the nonwoven fabric may become hard. may appear grainy.

そして、単位目付あたりの不織布構成繊維本数は、各繊維の単位目付当たりの構成繊維本数の合計となる。 The number of fibers constituting the nonwoven fabric per unit basis weight of the nonwoven fabric of this embodiment is 150,000 or more and 400,000 or less. Here, the number of fibers constituting the nonwoven fabric per unit basis weight is the number of fibers included in the nonwoven fabric per unit basis weight. For example, when a nonwoven fabric contains x mass % of fibers A having a fineness of a decitex (dtex) and a fiber length of damm, the number of constituent fibers per unit basis weight of the fibers A in the nonwoven fabric is determined by the following formula.

The number of fibers constituting the nonwoven fabric per unit basis weight is the total number of fibers constituting the nonwoven fabric per unit basis weight of each fiber.

As is clear from the above formula, when two types of fibers with the same fiber length and different finenesses are included in the same ratio, the number of constituent fibers per unit basis weight is larger for fibers with smaller finenesses. In this embodiment, if the proportion of fibers with a smaller fineness is too high, the nonwoven fabric may become too dense and the bulk changeability may decrease, and if the proportion of fibers with a large fineness is too large, the surface of the nonwoven fabric may become too dense. It may be grainy.

Therefore, in this embodiment, by setting the number of constituent fibers per unit basis weight of the nonwoven fabric to 150,000 to 400,000, the first cellulose fiber with a large fineness and the second cellulose fiber with a small fineness are balanced. I try to be well included. That is, when the number of constituent fibers per unit basis weight of the nonwoven fabric is less than 150,000, the proportion of the first cellulose fibers is too high, and when the number of constituent fibers per unit basis weight of the nonwoven fabric exceeds 400,000, the proportion of the second cellulose fibers is too high. It can be said that the ratio is too high. The number of constituent fibers per unit basis weight of the nonwoven fabric is more preferably 150,000 or more and 250,000 or less.

As long as the number of fibers constituting the nonwoven fabric per unit basis weight is within the above range, the proportion of the first cellulose fibers may be 10% by mass or more and 80% by mass or less. If the proportion of the first cellulose fibers is less than 10% by mass, the strength of the nonwoven fabric may be low, and the bulk changeability of the nonwoven fabric may be low. Furthermore, if the proportion of the first cellulose fiber exceeds 80% by mass, the proportion of the second cellulose fiber and the adhesive fiber becomes small, and the feel of the nonwoven fabric may deteriorate or the strength of the nonwoven fabric may decrease. It may become lower and elongation may occur more easily.

As long as the number of fibers constituting the nonwoven fabric per unit basis weight is within the above range, the proportion of the second cellulose fibers may be 10% by mass or more and 80% by mass or less. If the proportion of the second cellulose fiber is less than 10% by mass, the feel of the nonwoven fabric may deteriorate. When the proportion of the second cellulose fiber exceeds 80% by mass, the proportion of the first cellulose fiber and the adhesive fiber becomes small, and the strength of the nonwoven fabric decreases and elongation tends to occur. Otherwise, the bulk changeability of the nonwoven fabric may decrease.

The nonwoven fabric of the present embodiment may contain the first cellulose fibers in an amount of 40% by mass or more and 80% by mass or less, and may contain the second cellulose fibers in an amount of 10% by mass or more and 50% by mass or less. When the two types of cellulose fibers are contained in these proportions, a nonwoven fabric with good bulk changeability and good texture can be obtained. The nonwoven fabric of this embodiment more preferably contains the first cellulose fibers in an amount of 50% by mass or more and 75% by mass or less, and contains the second cellulose fibers in an amount of 15% by mass or more and 40% by mass or less, and even more preferably, It contains 60% by mass or more and 70% by mass or less of the first cellulose fiber, and contains 20% by mass or more and 30% by mass or less of the second cellulose fiber.

In the nonwoven fabric of this embodiment, the first cellulose fibers and the second cellulose fibers may be contained in the same proportion, or the first cellulose fibers may be contained in a larger proportion than the second cellulose fibers. May be included. By containing a large amount of the first cellulose fiber, it is easy to suppress neps during the production of the nonwoven fabric, and it is easy to achieve a good texture.

The basis weight of the nonwoven fabric of this embodiment is not particularly limited, and may be, for example, 20 g/m ² or more and 75 g/m ² or less, particularly 25 g/m ² or more and 65 g/m ² or less, and more particularly 35 g/m 2 or less. /m ² or more and 55 g/m ² or less. The basis weight of the nonwoven fabric is determined depending on the purpose, the amount of liquid to be impregnated, etc. For example, when the sheet is a face mask, the basis weight of the nonwoven fabric is 30 g/m2 or ^more and 65 g/ ^m2 or less, especially 35 g/m2. It may be ² or more and 60 g/m ² or less. When the sheet is an eye sheet (also referred to as an eye pack), the basis weight of the nonwoven fabric may be 40 g/m ² or more and 75 g/m ² or less, particularly 50 g/m ² or more and 70 g/m ^{2 or} less.

The thickness of the nonwoven fabric may be, for example, 0.40 mm or more, particularly 0.50 mm or more, and more particularly 0.60 mm or more when dry and under a load of 294 Pa per cm ² of the nonwoven fabric. Further, the thickness of the nonwoven fabric may be, for example, 1.0 mm or less, particularly 0.90 mm or less, and more particularly 0.80 mm or less. In addition, the thickness of the entire nonwoven fabric, when dry and under a load of 1.96 kPa per cm ² of the nonwoven fabric, is, for example, 0.30 mm or more, particularly 0.40 mm or more, more particularly 0.45 mm or more. It's fine. Furthermore, the thickness of the nonwoven fabric may be, for example, 0.80 mm or less, particularly 0.70 mm or less, and more particularly 0.60 mm or less. If the thickness of the nonwoven fabric is too small, the amount of liquid that can be impregnated into the nonwoven fabric will be small, and a predetermined amount of liquid may not be supplied to the skin. If the thickness of the entire nonwoven fabric is too large, it may be difficult to fit the sheet along the curved surface of the skin, and the sheet may partially float, making it difficult to cover the skin evenly with the entire sheet.

The nonwoven fabric of this embodiment preferably has a thickness change rate of 22.0% or more when the load applied per cm ² of the nonwoven fabric is changed from 294 Pa to 1.96 kPa when dry. The rate of change in thickness is related to the change in volume; the larger the rate, the larger the voids between the fibers, and the higher the change in volume. A nonwoven fabric with high bulk changeability easily releases liquid even when the nonwoven fabric is pressed with a slight force, thereby providing a sheet that gives the user a good soaking feeling (the feeling of being sufficiently moistened with liquid). In particular, the rate of thickness change may be 22.2% or more, more particularly 22.4% or more.

The nonwoven fabric of this embodiment preferably has a coefficient of dynamic friction μk in the MD direction (machine direction) of 0.70 or more, and a coefficient of variation CV of the coefficient of dynamic friction in the MD direction of 0.032 or less. Preferably. In particular, the dynamic friction coefficient in the MD direction may be 0.72 or more. Further, the variation coefficient of the dynamic friction coefficient in the MD direction may be particularly 0.30 or less.

The coefficient of dynamic friction μk is an index of the feeling of adhesion, and the larger this value is, the greater the surface resistance of the nonwoven fabric is, the more difficult it is to slip, and the easier it is to adhere to the skin. The coefficient of variation CV is an index of the smoothness of the surface of a nonwoven fabric, and the larger this value is, the more rough the nonwoven fabric feels and the worse the tactile sensation is. In this embodiment, by using the second cellulose fiber, it is possible to increase the dynamic friction coefficient μk in the MD direction of the nonwoven fabric and to decrease the coefficient of variation CV.

The nonwoven fabric of this embodiment preferably has a bending resistance of 62.0 cN or less when wet, particularly may be 61.0 cN or less, and more particularly may have 53.0 cN or less. The bending resistance is measured according to JIS L 1096:2010 8.21.5 E method (handle-o-meter method), as described below. The lower the bending resistance, the more flexible the material is, and the higher the ability to follow curved surfaces. Therefore, according to this embodiment, a nonwoven fabric suitable for a sheet covering an area with many irregularities such as the face can be obtained.

Next, a method for manufacturing the nonwoven fabric of this embodiment will be explained.
The nonwoven fabric of this embodiment is produced by mixing first cellulosic fibers, second cellulosic fibers, adhesive fibers, and other fibers included as the case may be to prepare a fibrous web and bonding the fibers together. It can be manufactured by bonding with adhesive fibers. Bonding methods include thermal bonding, bonding by electron beam irradiation, and ultrasonic welding.

The fibrous web may be any selected from, for example, parallel webs, cross webs, carded webs such as semi-random webs and random webs, air-lay webs, wet papermaking webs, and the like. The fibrous web is preferably a parallel web. Parallel webs have high productivity and are easy to produce nonwoven fabrics that are bulky and have a large specific volume. Further, 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 likely to be soft and have an excellent texture.

In the method for manufacturing a nonwoven fabric according to the present embodiment, the fibers may be subjected to an interlacing treatment before being bonded to each other with adhesive fibers. By intertwining the fibers, the stiffness of the sheet surface can be suppressed and the sheet surface can be made smooth. The treatment for entangling the fibers is, for example, a needle punching treatment or a high-pressure fluid stream (especially water stream) entangling treatment. In high pressure fluid flow processing, the high pressure fluid is, for example, a high pressure gas such as compressed air, and a high pressure liquid such as high pressure water. In the production of nonwoven fabrics, a hydroentangling process using high-pressure water as the high-pressure fluid is often used, and in this embodiment as well, the hydroentangling process is preferably used from the viewpoint of ease of implementation. In the following, a manufacturing method will be described in which high-pressure water (hereinafter also simply referred to as "water flow") is used as the high-pressure fluid.

The hydroentangling treatment is carried out by placing the fibrous web on a support and spraying a columnar water stream onto it. For example, the support is preferably a plain weave support of 80 mesh or more and 100 mesh or less. In the hydroentangling process, a water stream with a water pressure of 1 MPa or more and 15 MPa or less is applied to the surface of the fiber web from a nozzle in which orifices with a hole diameter of 0.05 mm or more and 0.5 mm or less are provided at intervals of 0.3 mm or more and 1.5 mm or less. This may be carried out by spraying 1 to 5 times on each back side. The water pressure is preferably 1 MPa or more and 10 MPa or less, more preferably 1 MPa or more and 7 MPa or less.

The nonwoven fabric obtained by hydroentangling is subjected to adhesive treatment. The adhesion treatment may be thermal adhesion treatment, adhesion by electron beam irradiation, or ultrasonic welding. When the adhesive treatment is a thermal adhesive treatment, a drying treatment may be performed simultaneously with the thermal adhesive treatment. The thermal bonding treatment is carried out at a temperature at which at least a portion of the adhesive fibers melt or soften. The thermal bonding treatment may be performed using, for example, a hot air through-type heat treatment machine (also referred to as an air-through type heat treatment machine), a hot air blowing type heat treatment machine, an infrared heat treatment machine, or the like.

(Liquid-impregnated skin covering sheet)
By impregnating the nonwoven fabric of this embodiment with a liquid, a liquid-impregnated skin covering sheet for covering human or animal skin can be obtained. The liquid to be impregnated and the amount of impregnation are appropriately selected depending on the application. When the sheet is provided as a liquid-impregnated skin covering sheet for personal use, such as a face mask for personal use, a keratin care sheet, and a decollete sheet, 600 parts by mass of a liquid containing an active ingredient (for example, cosmetics) is added to 100 parts by mass of the nonwoven fabric. It may be impregnated with an impregnation amount of 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 let me. Examples of active ingredients include, but are not limited to, a moisturizing ingredient, a keratin softening ingredient, an antiperspirant ingredient, a scent ingredient, a whitening ingredient, a blood circulation promoting ingredient, an ultraviolet protection ingredient, and a slimming ingredient.

A face mask has a shape suitable for covering the face, and is further provided with openings or notches by punching as necessary, for example, in areas corresponding to the eyes, nose, and mouth. provided. Alternatively, the face mask may be shaped to cover only a portion of the face (eg, around the eyes, mouth, nose, or cheeks). Alternatively, the face mask may be provided as a set consisting of a sheet that covers the area around the eyes and a sheet that covers the area around the mouth, or may be provided as a set of sheets that separately cover three or more areas.

A keratin care sheet is a skin covering sheet used on heels, elbows, knees, etc. where the keratin is thick and hardens easily.It moisturizes and softens the keratin by impregnating it with a liquid containing keratin softening ingredients and moisturizing ingredients. It has the effect of stimulating or promoting the removal of excess dead skin. The nonwoven fabric of this embodiment can be used as a base material in a keratin care sheet that exhibits any effect or efficacy. A keratin care sheet, for example, a keratin care sheet for heels, has notches and/or cutouts, and/or a part of the sheet is punched out with an opening so that the sheet can easily match the curve of the heel when pasted. Provided in a form with

Liquid-impregnated skin covering sheets are used to moisturize or otherwise care for any part of the body (for example, the neck, the back of the hand, or the area from the neck to the chest (also called the décolletage)). It may also be a moisturizing sheet impregnated with a liquid containing other benefits. 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 abdomen, for example.

The liquid-impregnated skin covering sheet may be provided in a state in which the base material, a nonwoven fabric, is folded. The folding may be carried out only in one direction of the non-woven fabric, or may be carried out one or more times in each different direction of the non-woven fabric. For example, a liquid-impregnated nonwoven fabric is folded one or more times in a direction parallel to the machine direction (i.e., the folds are parallel to the machine direction), and then folded in a direction parallel to the transverse direction (i.e., the folds are parallel to the machine direction). The liquid-impregnated skin covering sheet may be provided by folding the skin one or more times (parallel to the skin).

When using the nonwoven fabric of this embodiment, the viscosity of the liquid to be impregnated is relatively low, for example, from 1.0 mPa·s to 550 mPa·s, and a liquid film is not formed between the sheet and the skin, or the film is thin. To provide a user with a good tactile sensation even when a part of the film is interrupted. This is because, as mentioned above, the nonwoven fabric itself has a good feel. Further, the nonwoven fabric of this embodiment exhibits good bulk changeability even though it contains the second cellulose fibers having a small fineness. Therefore, when the liquid-impregnated skin covering sheet is used as a face mask, for example, when the sheet is pressed by hand, the impregnated liquid can be appropriately released to the skin.

This embodiment will be described below using examples.
The following fibers were prepared as fibers used in this example.
- Rayon fiber A: Viscose rayon (trade name: BH, manufactured by Daiwabo Rayon Co., Ltd.) with a fineness of 0.6 dtex and a fiber length of 32 mm.
- Rayon fiber B: Viscose rayon (trade name: BH, manufactured by Daiwabo Rayon Co., Ltd.) with a fineness of 0.9 dtex and a fiber length of 38 mm.
- Rayon fiber C: Viscose rayon with a fineness of 1.7 dtex and a fiber length of 40 mm (product name: Corona CD, manufactured by Daiwabo Rayon Co., Ltd.).

- Rayon fiber D: Viscose rayon with a fineness of 2.2 dtex and a fiber length of 51 mm (product name: Corona CD, manufactured by Daiwabo Rayon Co., Ltd.).
- Rayon fiber E: Viscose rayon with a fineness of 3.3 dtex and a fiber length of 51 mm (product name: Corona CD, manufactured by Daiwabo Rayon Co., Ltd.).
- Rayon fiber F: Viscose rayon with a fineness of 1.4 dtex and a fiber length of 44 mm (product name: Corona CD, manufactured by Daiwabo Rayon Co., Ltd.).
・Thermoadhesive fiber: Concentric core-sheath composite fiber with fineness of 2.2 dtex and fiber length of 51 mm (core component: polyethylene terephthalate (melting point 255°C), sheath component: low melting point copolymerized polyethylene terephthalate (melting point 110°C), core-sheath) ratio (volume ratio) of 50:50) (trade name: Safmet T9611, manufactured by Toray Industries, Inc.).

(Example 1)
Using the fibers shown in Table 1-1, the fibers were mixed in the proportions shown in Table 1-1, and a parallel short fiber web with a web target weight of about 50 g/m ² was produced using a parallel card machine.
The short fiber web was placed on a 90 mesh plain weave support, and while being conveyed at a speed of 4 m/min, a water stream with a water pressure of 2.5 MPa was sprayed once from one surface side, and then from the other side. A water entanglement treatment was performed in which a water stream with a water pressure of 3.0 MPa was sprayed once from the surface side. The nozzle used in the hydroentangling treatment was a nozzle with orifices of 0.1 mm diameter spaced at 0.6 mm intervals, and the spacing between the nozzle and the short fiber web during treatment was 20 mm. Next, the short fiber web after the hydroentanglement treatment was subjected to drying treatment and heat treatment simultaneously for 1 minute using a hot air penetration type heat treatment machine set at 140°C. The nonwoven fabric of Example 1 was obtained by melting only the sheath component of the heat-adhesive fibers by heat treatment and thermally bonding the constituent fibers together using the sheath component.

(Examples 2-4, Comparative Examples 1-8)
The types and proportions of fibers were as shown in Tables 1-1 and 1-2, and hydroentangling treatment and drying/heat treatment were performed under the same conditions as those employed in Example 1 to obtain a nonwoven fabric.
Measurement and evaluation results of physical properties of each Example and each Comparative Example are shown in Tables 2-1 to 6-2.

Each physical property in the table was measured and evaluated by the following method.

[thickness]
The thickness of the nonwoven fabric when dry is measured using a thickness measuring machine (product name: THICKNESS GAUGE model CR-60A manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) under a load of 294 Pa and 1.96 kPa. did.
The specific volume was calculated from the basis weight of the nonwoven fabric and the thickness under a load of 1.96 kPa.

The thickness change rate (%) was calculated from the thickness under a load of 294 Pa and the thickness under a load of 1.96 kPa using the following formula.
Thickness change rate (%) = {(Thickness at 294 Pa load - Thickness at 1.96 kPa load)/Thickness at 294 Pa load} x 100
Regarding the thickness change rate, a value of 22.0% or more is evaluated as ○ (pass), and a rate of change of less than 22.0% is evaluated as × (fail).

[Bending resistance]
The bending resistance of the nonwoven fabric was measured according to JIS L 1096:2010 8.21.5 E method (handle-o-meter method). Specifically, the measurement was performed using the following procedure.
Place a sample piece measuring 20 cm long and 20 cm wide on the sample stage so that the measurement direction of the sample piece is perpendicular to the slot (gap width 10 mm).
Next, the penetrator blade, which was adjusted to be 8 mm below the surface of the sample stage, was lowered, and when the sample was pushed in, the blade was adjusted to be 6.7 cm (1/3 of the width of the sample) from either side. The resistance value against indentation is read at different locations on the front and back in both the vertical and horizontal directions. Read the highest value (cN) indicated by the microammeter as the resistance value. The total value of the highest values on the four sides is calculated, and the average value of three times is calculated, and this is taken as the dry (DRY) stiffness (cN) of the sample.

Wet bending resistance was determined by impregnating 100 parts by mass of nonwoven fabric with 500 parts by mass of distilled water and placing a polyethylene sheet (length 23 cm, width 23 cm, thickness 0.06 mm) under the nonwoven fabric. Measure. The value obtained by subtracting the measured value of the bending resistance of only the polyethylene sheet from the obtained measurement value is defined as the bending resistance in wet conditions (WET).
The bending resistance when wet (WET) is evaluated as ○ (pass) if it is 62.0 cN or less, and × (fail) if it is larger than 62.0 cN.

[Dynamic friction coefficient, coefficient of variation of dynamic friction coefficient]
The dynamic friction coefficient μk and the coefficient of variation CV of the dynamic friction coefficient were measured using a static/dynamic friction measuring device (Tribomaster TL201Ts, manufactured by Trinity Lab Co., Ltd.). A 5 cm x 10 cm nonwoven fabric was prepared as a sample piece. Note that sample pieces were prepared in which the long side of the nonwoven fabric was in the MD direction and the other in which the long side was in the CD direction.

A tactile contact (manufactured by Trinity Lab Co., Ltd.) was used as the contact terminal of the measuring device. With 100 parts by mass of the sample piece impregnated with 1000 parts by weight of distilled water, the sample piece was fixed on the measuring table of a measuring machine (sliding table type), and the contact terminal was applied with a load of 30 gf to the surface of the sample piece. It was evaluated by moving it back and forth twice at a speed of 10 mm/sec and a distance of 30 mm. The values of the second round trip were read, and the average value of the previous value and the return value was taken as the dynamic friction force (gf) of one sample piece. Measurement was carried out four times on a test piece whose long side was in the MD direction, and four times on a test piece whose long side was in the CD direction, and the average value of the four measurements was calculated based on the MD direction or The dynamic friction force in the CD direction is Fk (gf).

The dynamic friction coefficient μk in the MD or CD direction was calculated from the dynamic friction force Fk (gf) and the load (30 gf). Further, the coefficient of variation CV of the coefficient of dynamic friction was determined from the standard deviation σ of the coefficient of dynamic friction obtained during the measurement and the average value μk of the coefficient of dynamic friction described above according to the following formula.
Coefficient of variation of dynamic friction coefficient CV=σ/μk

The dynamic friction coefficient in the MD direction is evaluated as ○ (pass) when it is 0.70 or more, and as × (fail) when it is less than 0.70.
The coefficient of variation of the coefficient of dynamic friction in the MD direction is evaluated as ○ (pass) when it is 0.032 or less, and as × (fail) when it is larger than 0.032.

[Tensile strength, elongation rate, stress at 10%/20% elongation]
According to JIS L 1913:2010 6.3, using a constant speed tension type tensile tester, the specimen was subjected to a tensile test under the conditions of a width of 50 mm, a grip interval of 10 cm, and a tensile speed of 30 ± 2 cm/min, and then cut. The load value (tensile strength), elongation rate, stress at 10% elongation, and stress at 20% elongation were measured. The tensile test was conducted with the longitudinal direction (MD direction) and the lateral direction (CD direction) of the nonwoven fabric as the tensile directions. All measurement results are shown as the average of values measured for three samples.
Wet tensile strength and the like were measured in a state where 100 parts by mass of the nonwoven fabric was impregnated with 250 parts by mass of distilled water.

[Suction height]
JIS L 1907:2010 7.1.2 The suction height was measured according to the Bayreck method. Create a sample (MD direction x CD direction = 200 mm x 25 mm) with the water suction direction in the MD direction, set the sample so that the water suction direction matches the MD direction, and check the suction height after 300 seconds. was measured. Three samples were measured, and the average value was taken as the suction height (mm) in the MD direction. Similarly, create a sample (MD direction x CD direction = 25 mm x 200 mm) with the water suction direction in the CD direction, set the sample so that the water suction direction matches the CD direction, and suck it up after 300 seconds. The height was measured.

[Number of constituent fibers]
The number of constituent fibers per unit weight (g/m ² ) of each fiber constituting the nonwoven fabric was calculated using the following formula.

Number of constituent fibers per unit basis weight (number of fibers) = fiber ratio (mass%) x 10 ⁵ / {fineness (dtex) x fiber length (mm)}

The number of fibers constituting the nonwoven fabric per unit basis weight (g/m ² ) of the nonwoven fabric was the total number of fibers constituting the nonwoven fabric per unit basis weight of each fiber.
The ratio (%) of the number of constituent fibers per unit basis weight of each fiber constituting the nonwoven fabric was calculated from the number of constituent fibers (number) per unit basis weight of each fiber as a number ratio.

Examples 1 to 4 all had large thickness change rates and excellent bulk changeability. In addition, all of Examples 1 to 4 had a large dynamic friction coefficient in the MD direction, a small coefficient of variation of the dynamic friction coefficient in the MD direction, excellent adhesion of the surface to the skin, and small surface roughness. Ta. Examples 1 to 4 all had low bending resistance when wet, were flexible, and had high conformability to curved surfaces. Examples 1 to 4 all contained rayon with a small fineness, so they were excellent in water absorption. Examples 3 and 4 had higher bending resistance when wet than Examples 1 and 2. This is presumably because in Examples 3 and 4, the number (number) of constituent fibers per unit basis weight and the ratio (%) of the number of constituent fibers per unit basis weight of the second cellulose fibers were relatively high.

In Comparative Example 1, the number of fibers constituting the nonwoven fabric exceeded 150,000, but the fineness of the rayon used as the second cellulose fiber was 1.4 dtex, which was larger than that used in Examples. Therefore, in Comparative Example 1, the coefficient of variation CV of the coefficient of dynamic friction in the MD direction was large, and the surface was rough. In Comparative Examples 2 and 3, the fineness of the first cellulose fiber and the second cellulose fiber were both larger than those of the example, and the number of fibers constituting the nonwoven fabric was also less than 150,000. Therefore, the coefficient of variation CV of the coefficient of dynamic friction in the MD direction was large, and the surface was rough. Furthermore, the water absorption properties of Comparative Examples 2 and 3 were lower than those of Examples.

Comparative Examples 4 and 5 use the second cellulose fiber used in the example and do not contain other cellulose fibers. Therefore, all of them had a small rate of change in thickness and poor bulk changeability. Furthermore, Comparative Examples 4 and 5 had high bending resistance when wet and poor conformability to curved surfaces.

Comparative Examples 6 to 8 use the first cellulose fiber used in the examples or rayon with a finer fineness than that, and do not contain other cellulose fibers. Therefore, the coefficient of dynamic friction in the MD direction was small, the surface resistance was small, and the adhesion to the skin was smaller than those of the examples. Focusing on the bending resistance when wet in Comparative Examples 6 to 8, it is found that the larger the fineness of rayon, the higher the bending resistance when wet. It is presumed that 1.4 dtex or more and 2.0 dtex or less are preferable.

The nonwoven fabric of this embodiment includes the following aspects.
(Aspect 1)
A nonwoven fabric for a liquid-impregnated skin covering sheet comprising a first cellulosic fiber, a second cellulosic fiber, and an adhesive fiber, the fabric comprising:
The nonwoven fabric has a single layer structure,
The fineness of the first cellulose fiber is 1.4 dtex or more and 2.0 dtex or less,
The fineness of the second cellulose fiber is 0.5 dtex or more and 1.0 dtex or less,
The nonwoven fabric contains 5% by mass or more and 20% by mass or less of the adhesive fiber,
In the nonwoven fabric, the fibers are bonded to each other by adhesive fibers,
The number of fibers constituting the nonwoven fabric per unit basis weight of the nonwoven fabric is 150,000 or more and 400,000 or less,
Non-woven fabric for liquid-impregnated skin covering sheets.
(Aspect 2)
The nonwoven fabric for a liquid-impregnated skin covering sheet according to aspect 1, wherein the nonwoven fabric contains the first cellulose fiber in an amount of 10% by mass or more and 80% by mass or less.
(Aspect 3)
The nonwoven fabric for a liquid-impregnated skin covering sheet according to aspect 1 or 2, wherein the nonwoven fabric contains the second cellulose fiber in an amount of 10% by mass or more and 80% by mass or less.
(Aspect 4)
The liquid-impregnated skin coating sheet according to aspect 1, wherein the nonwoven fabric contains the first cellulose fiber in an amount of 40% by mass or more and 80% by mass or less, and contains the second cellulose fiber in an amount of 10% by mass or more and 50% by mass or less. Non-woven fabric.
(Aspect 5)
The nonwoven fabric contains the first cellulosic fibers and the second cellulosic fibers in equal proportions, or contains the first cellulosic fibers in a larger proportion than the second cellulosic fibers, The nonwoven fabric for liquid-impregnated skin coating sheets according to any one of aspects 1 to 4.
(Aspect 6)
The nonwoven fabric for a liquid-impregnated skin covering sheet according to any one of aspects 1 to 5, wherein the first cellulosic fiber and the second cellulosic fiber are both regenerated fibers.
(Aspect 7)
The nonwoven fabric for a liquid-impregnated skin covering sheet according to any one of aspects 1 to 6, wherein the number of fibers constituting the nonwoven fabric per unit basis weight of the nonwoven fabric is 150,000 to 250,000.
(Aspect 8)
The nonwoven fabric for a liquid-impregnated skin covering sheet according to any one of aspects 1 to 7, wherein the nonwoven fabric has a basis weight of 25 g/m ² or more and 65 g/m ² or less.
(Aspect 9)
A liquid-impregnated skin-covering sheet obtained by impregnating the liquid-impregnated nonwoven fabric for skin-covering sheets according to any one of aspects 1 to 8 with a liquid.
(Aspect 10)
The liquid-impregnated skin coating sheet according to aspect 9, wherein the liquid has a viscosity of 1.0 mPa·s or more and 550 mPa·s or less.
(Aspect 11)
The liquid-impregnated skin covering sheet of embodiment 9 or 10, which is a face mask.

The nonwoven fabric of the present disclosure has good tactile sensation and excellent conformability to curved surfaces and bulk changeability, so it is useful as a base material for liquid-impregnated skin covering sheets such as face masks.

Claims (11)

A nonwoven fabric for a liquid-impregnated skin covering sheet comprising a first cellulosic fiber, a second cellulosic fiber, and an adhesive fiber, the fabric comprising:
The nonwoven fabric has a single layer structure,
The fineness of the first cellulose fiber is 1.4 dtex or more and 2.0 dtex or less,
The fineness of the second cellulose fiber is 0.5 dtex or more and 1.0 dtex or less,
The nonwoven fabric contains 5% by mass or more and 20% by mass or less of the adhesive fiber,
In the nonwoven fabric, the fibers are bonded to each other by adhesive fibers,
The number of fibers constituting the nonwoven fabric per unit basis weight of the nonwoven fabric is 150,000 or more and 400,000 or less,
Contains 10% by mass or more and 80% by mass or less of the first cellulose fiber,
Contains 10% by mass or more and 80% by mass or less of the second cellulose fiber,
Both the first cellulosic fiber and the second cellulosic fiber are regenerated fibers,
Non-woven fabric for liquid-impregnated skin covering sheets. The liquid-impregnated skin according to claim 1, wherein the nonwoven fabric contains the first cellulose fiber in an amount of 40% by mass or more and 80% by mass or less, and contains the second cellulose fiber in an amount of 10% by mass or more and 50% by mass or less. Nonwoven fabric for covering sheets. The nonwoven fabric contains the first cellulosic fibers and the second cellulosic fibers in equal proportions, or contains the first cellulosic fibers in a larger proportion than the second cellulosic fibers, The nonwoven fabric for a liquid-impregnated skin coating sheet according to claim 1 or 2 . The liquid according to any one of claims 1 to 3, wherein the first cellulose fiber has a fiber length of 28 mm or more and 75 mm or less, and the second cellulose fiber has a fiber length of 28 mm or more and 75 mm or less. Non-woven fabric for impregnated skin covering sheets . The liquid according to any one of claims 1 to 3, wherein the first cellulose fiber has a fiber length of 30 mm or more and 65 mm or less, and the second cellulose fiber has a fiber length of 30 mm or more and 65 mm or less. Non-woven fabric for impregnated skin covering sheets . The nonwoven fabric for a liquid-impregnated skin covering sheet according to any one of claims 1 to 5 , wherein the number of fibers constituting the nonwoven fabric per unit basis weight of the nonwoven fabric is 150,000 to 250,000. The nonwoven fabric for a liquid-impregnated skin covering sheet according to any one of claims 1 to 6 , wherein the nonwoven fabric has a basis weight of 25 g/m ² or more and 65 g/m ² or less. The nonwoven fabric for a liquid-impregnated skin covering sheet according to any one of claims 1 to 7, wherein the nonwoven fabric has a dynamic friction coefficient μk in the MD direction of 0.70 or more. A liquid-impregnated skin-covering sheet, which is obtained by impregnating the liquid-impregnated nonwoven fabric for skin-covering sheets according to any one of claims 1 to 8 with a liquid. The liquid-impregnated skin coating sheet according to claim 9, wherein the liquid has a viscosity of 1.0 mPa·s or more and 550 mPa·s or less. The liquid-impregnated skin covering sheet according to claim 9 or 10, which is a face mask.