JP2024123015A - Nonwoven fabric for liquid-impregnated skin covering sheet and manufacturing method thereof, liquid-impregnated skin covering sheet, and face mask - Google Patents

Abstract

[Problem] To provide a nonwoven fabric for liquid-impregnated skin application sheets, which has excellent liquid retention, good texture, a soft feel, and a relatively high strength required to stretch the nonwoven fabric at a low elongation. [Solution] A nonwoven fabric for liquid-impregnated skin application sheets containing 50 mass % or more of adhesive fibers, in which the fibers are bonded to each other and entangled with each other, the basis weight is 15 g/m2 to 70 g/m2, the breaking elongation (DRY) in the CD direction is 80% or more, the water retention is 900% or more when the basis weight is 15 g/m2 to 40 g/m2, and the bending resistance (DRY)/thickness (1.96 kPa load) is 56.0 to 100 when the basis weight is more than 40 g/m2 and 70 g/m2 or less. [Selected Figure] None

Description

The present disclosure relates to a nonwoven fabric that serves as the base material for a liquid-impregnated skin covering sheet that is impregnated with a liquid, particularly a cosmetic, a method for producing the same, a liquid-impregnated skin covering sheet that uses the nonwoven fabric, and a face mask that uses the liquid-impregnated skin covering sheet.

Various liquid-impregnated sheets have been proposed and put into practical use for covering the skin of humans or animals and applying a specific substance to the skin of humans or animals. Specific examples include liquid-impregnated skin covering sheets (face masks and keratin care sheets used on heels, elbows, knees, etc.) impregnated with a liquid (e.g., cosmetics) containing active ingredients. Nonwoven fabrics are generally used as the substrate for liquid-impregnated skin covering sheets. Because liquid-impregnated skin covering sheets are often used in contact with the skin for a relatively long period of time, various nonwoven fabrics have been proposed as the substrate from the standpoints of adhesion, liquid release, tactile feel, convenience, etc.

International Publication No. WO 2009/148048 JP 2017-109053 A JP 2018-141250 A

The present disclosure aims to provide a nonwoven fabric for a liquid-impregnated skin covering sheet that has excellent liquid retention capacity, good texture, a soft feel, and a relatively high strength required to stretch the nonwoven fabric at a low elongation. In another aspect, the present disclosure aims to provide a liquid-impregnated skin covering sheet, particularly a face mask, in which the nonwoven fabric is impregnated with liquid.

The present disclosure provides, in a first aspect,
A nonwoven fabric for a liquid-impregnated skin covering sheet, comprising 20% by mass or more of adhesive fibers,
In the nonwoven fabric, the fibers are bonded to each other and entangled with each other,
The basis weight is 15 g/ ^m2 or more and 40 g/ ^m2 or less,
The breaking elongation (DRY) in the CD direction is 80% or more,
The water retention rate is 900% or more.
Provided is a nonwoven fabric for liquid-impregnated skin covering sheets.

In a second aspect, the present disclosure provides
A nonwoven fabric for a liquid-impregnated skin covering sheet, comprising 20% by mass or more of adhesive fibers,
In the nonwoven fabric, the fibers are bonded to each other and entangled with each other,
The basis weight is more than 40 g/ ^m2 and 70 g/ ^m2 or less,
The breaking elongation (DRY) in the CD direction is 80% or more,
The bending resistance (DRY)/thickness (load of 1.96 kPa) is 56.0 or more and 100 or less;
Provided is a nonwoven fabric for liquid-impregnated skin covering sheets.

In a third aspect, the present disclosure provides a liquid-impregnated skin application sheet obtained by impregnating the nonwoven fabric for the liquid-impregnated skin application sheet according to the first or second aspect with a liquid.

The nonwoven fabric for liquid-impregnated skin covering sheets (hereinafter "nonwoven fabric") of the present disclosure has fibers integrated by both bonding and entanglement, so that the strength required for stretching at low elongation is relatively large, and it has excellent handleability. In addition, the nonwoven fabric of the present disclosure is relatively bulky, so that it has excellent liquid retention ability and shows relatively high adhesion, which reduces or eliminates the portion of the nonwoven fabric that "floats" above the skin for a relatively long period of time, allowing liquid to be distributed over the entire skin at a specified site.

(Background to this disclosure)
A liquid-impregnated skin covering sheet is generally stored in a liquid-impermeable packaging container in a folded state, and a user takes out the sheet from the container, unfolds it, and applies it so that a predetermined part is covered. During this series of operations during use, a force is applied to the sheet to stretch it, and if the sheet is easily stretched by a small force, that is, if the stretching stress (or stretching modulus) is small, the sheet may stretch and deform. For example, if the sheet is a face mask, the deformation of the sheet causes the inconvenience that the openings provided corresponding to the eyes and mouth are not correctly positioned at the eyes and mouth. In addition, if the nonwoven fabric stretches with a small force, the processability of the nonwoven fabric decreases, and the liquid impregnation process, the formation of openings, and cutting into a predetermined shape may become difficult.

The inventors therefore investigated various nonwoven fabric configurations to improve the stress when the nonwoven fabric is stretched by about 10%. Nonwoven fabrics for liquid-impregnated skin-covering sheets include hydroentangled nonwoven fabrics in which fibers are integrated by hydroentanglement treatment as described in Patent Document 1, and bonded nonwoven fabrics in which fibers are bonded together using adhesive fibers as described in Patent Documents 2 and 3.

Hydroentangled nonwoven fabrics are made by entangling the fibers together, so they are more flexible and have a softer feel than bonded nonwoven fabrics. However, the nonwoven fabric is prone to stretching, i.e., the stress during stretching is small, so it tends to be less easy to process and handle, and this tendency becomes more pronounced as the basis weight of the nonwoven fabric decreases.

In bonded nonwoven fabrics, the fibers are bonded relatively strongly to each other, so that the stress during elongation at low elongation tends to be higher than that of hydroentangled nonwoven fabrics. However, in bonded nonwoven fabrics, the bonded portions of the fibers tend to make the nonwoven fabric feel harder and rougher, and the flexibility tends to be poorer.
In view of the above problems, it is possible to improve the stress at elongation of a hydroentangled nonwoven fabric by performing a hydroentanglement treatment followed by a bonding treatment, but this inevitably leads to a decrease in the feel of the nonwoven fabric due to bonding.

Therefore, the present inventors have investigated a method for improving the stress at extension by utilizing the adhesion between fibers while maintaining the good touch and flexibility of a hydroentangled nonwoven fabric, and have found that a manufacturing method in which a fiber web containing adhesive fibers is first subjected to a bonding treatment and then to an entanglement treatment can obtain a nonwoven fabric that is soft and has a good touch while appropriately improving the stress at extension, as the bonded portions are partially destroyed in the subsequent entanglement treatment, thereby reducing the rough and hard feeling.
The nonwoven fabric and its manufacturing method according to the present disclosure, as well as a liquid-impregnated skin application sheet using the same, will be described below.

[Embodiment 1]
An example of the nonwoven fabric according to the first embodiment of the present disclosure is a nonwoven fabric for a liquid-impregnated skin-applying sheet, which contains 20% by mass or more of adhesive fibers,
In the nonwoven fabric, the fibers are bonded to each other and entangled with each other,
The basis weight is 15 g/ ^m2 or more and 40 g/ ^m2 or less,
The breaking elongation (DRY) in the CD direction is 80% or more,
The water retention rate is 900% or more.
This nonwoven fabric is for use as a liquid-impregnated skin covering sheet.

Alternatively, another example of the nonwoven fabric of the first embodiment of the present disclosure is a nonwoven fabric for a liquid-impregnated skin-applying sheet, which contains 20% by mass or more of adhesive fibers,
In the nonwoven fabric, the fibers are bonded to each other and entangled with each other,
The basis weight is more than 40 g/ ^m2 and 70 g/ ^m2 or less,
The breaking elongation (DRY) in the CD direction is 80% or more,
The bending resistance (DRY)/thickness (load of 1.96 kPa) is 56.0 or more and 100 or less;
This nonwoven fabric is for use as a liquid-impregnated skin covering sheet.

The nonwoven fabric of this embodiment contains adhesive fibers, and the fibers are bonded and entangled with each other. Its breaking elongation (DRY) in the CD direction is 80% or more, and when the basis weight is relatively small, its water retention is 900% or more, and when the basis weight is relatively large, its bending resistance (DRY)/thickness (1.96 kPa load) is 56.0 or more and 100 or less. The fibers that make up the nonwoven fabric of this embodiment will be described below first.

(Adhesive Fiber)
The term "adhesive fiber" refers to a fiber that exhibits adhesiveness through a bonding treatment (e.g., thermal bonding treatment, electron beam irradiation, ultrasonic welding (ultrasonic welder), etc.) and can be bonded together to form bonded portions, and is not particularly limited as long as the nonwoven fabric intended by the present disclosure can be obtained.

The adhesive fibers include, for example, synthetic fibers made of thermoplastic resin.
The thermoplastic resin is not particularly limited, and examples thereof include polyester-based resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate, and copolymers thereof; polyolefin-based resins such as polypropylene, polyethylene (including high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, propylene copolymers mainly composed of propylene (including propylene-ethylene copolymers and propylene-butene-1-ethylene copolymers), ethylene-acrylic acid copolymers, and ethylene-vinyl acetate copolymers; polyamide-based resins such as nylon 6, nylon 12, and nylon 66; acrylic resins; engineering plastics such as polycarbonate, polyacetal, polystyrene, and cyclic polyolefins, as well as elastomers thereof. The synthetic fiber may be produced using one or more thermoplastic resins arbitrarily selected from these.

The synthetic fibers may be single fibers made of one or more thermoplastic resins selected from the above, or may be composite fibers made of two or more components (also called "sections"). In the composite fibers, each component may be made of one thermoplastic resin, or may be a mixture of two or more thermoplastic resins. The composite fibers may be, for example, sheath-core composite fibers, islands-in-the-sea composite fibers, or side-by-side composite fibers. The sheath-core composite fibers may be eccentric sheath-core composite fibers in which the center of the core component does not coincide with the center of the sheath component in the fiber cross section, or may be concentric sheath-core composite fibers in which the center of the core component coincides with the center of the sheath component in the fiber cross section. The composite fibers may also be split composite fibers.

Synthetic fibers, whether single or composite, may have a modified cross section. In the case of sheath-core and islands-in-sea composite fibers, the core and/or island components may have a modified cross section in the fiber cross section.
When the synthetic fibers have a non-circular cross section, the cross section may be elliptical, polygonal, star-shaped, or have multiple peaks joined at their bases (eg, cloverleaf shape).
In this embodiment, the synthetic fibers may be a combination of two or more synthetic fibers.

When the synthetic fiber is a composite fiber, two or more components may be arranged so that the thermoplastic resin with a lower melting point constitutes a part of the fiber surface. The thermoplastic resin with a low melting point (low melting point component) melts or softens when heat is applied in the process of producing the nonwoven fabric, and becomes an adhesive component. The low melting point component contributes to adhesion between fibers or to adhesion to other members, and can form adhesive sites.
When the synthetic fiber is a composite fiber, the low melting point component may be exposed over, for example, 40% or more of the circumferential length of the fiber in the cross section of the fiber, particularly over 50% or more, more particularly over 60% or more, and even more particularly over 80% or more. Alternatively, the low melting point component may be exposed over the entire circumferential length of the fiber.

The proportion of the length of the low melting point component of the synthetic fiber that is exposed on the circumferential surface of the fiber in the fiber cross section (hereinafter referred to as the "exposed length") affects the area of the bondable region and also affects the degree to which the adhesion between the fibers is eliminated in the entanglement process. When the exposed length of the low melting point component of the adhesive fiber is within the above range, the area of the bondable region becomes appropriate, and the number of bonding points can be made appropriate.

When the synthetic fibers are core-sheath type composite fibers, the core-sheath composite ratio (volume ratio, core/sheath) may be, for example, 80/20 to 20/80, and in particular 60/40 to 40/60. When the core/sheath composite ratio is within this range, the fibers are bonded appropriately. Furthermore, when the bonding process is followed by an entanglement process to produce a nonwoven fabric, excessive peeling does not occur at the bonded points in the entanglement process. Furthermore, when the core/sheath composite ratio is within this range, the fiber shape is easily maintained by the core component, and the strength of the nonwoven fabric can be made suitable.

Alternatively, the synthetic fiber may be a fiber derived from a splittable composite fiber. "Fiber derived from a splittable composite fiber" refers to a single fiber formed by splitting a splittable composite fiber, consisting of only one section before splitting, a fiber consisting of two or more sections, as well as a fiber in which one splittable composite fiber is partially split but not split at all in other parts. Alternatively, to the extent that fibers formed by splitting a splittable composite fiber are included in the nonwoven fabric, when one splittable composite fiber may not be split at all, such a completely unsplit splittable composite fiber is also included in the fibers derived from splittable composite fibers.

Specifically, splittable composite fibers have a fiber cross-sectional structure in which at least one of the constituent components is divided into two or more components in the fiber cross-section, at least a portion of the constituent components is exposed on the fiber surface, and the exposed portions are formed continuously in the length direction of the fiber. Splittable composite fibers may have wedge-shaped sections arranged in a chrysanthemum shape. Alternatively, splittable composite fibers may have each section arranged in layers in the fiber cross-section. Splittable composite fibers may be so-called solid splittable composite fibers that do not have continuous cavities in the length direction when the fiber cross-section is observed, or so-called hollow splittable composite fibers that have one or more continuous cavities in the length direction.

The number of divisions into each component in a splittable composite fiber (i.e., the number of sections in the composite fiber) may be, for example, 4 or more and 32 or less, particularly 4 or more and 20 or less, and more particularly 6 or more and 10 or less.

The adhesive component of the adhesive fiber (the low melting point component in the case of composite fibers) may be a copolymer of an olefin and an unsaturated carboxylic acid or its derivative. Such a copolymer exhibits good adhesion to cellulosic fibers. Examples of unsaturated carboxylic acids include maleic acid, acrylic acid, methacrylic acid, fumaric acid, itaconic acid, etc., and examples of derivatives thereof include anhydrides of unsaturated carboxylic acids, methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate, dimethylaminoethyl methacrylate, or similar acrylic acid esters, glycidyl acrylate, glycidyl methacrylate, butene carboxylic acid esters, allyl glycidyl ether, 3,4-epoxybutene, 5,6-epoxy-1-hexene, vinylcyclohexene monoxide, etc. In particular, it is preferable to use an ethylene-acrylic acid copolymer in which the olefin is ethylene and the unsaturated carboxylic acid or its derivative is acrylic acid or its derivative.

Combinations of thermoplastic resins that make up composite fibers include, for example, combinations of polyolefin resins and polyester resins, such as polyethylene/polyethylene terephthalate, polypropylene/polyethylene terephthalate, and propylene copolymer/polyethylene terephthalate (polyolefin resin/polyester resin), as well as combinations of two types of polyolefin resins, such as polyethylene/polypropylene, propylene copolymer/polypropylene, and ethylene-acrylic acid copolymer/polypropylene, and combinations of two types of polyester resins with different melting points.

When the synthetic fiber is a core-sheath type composite fiber in which a thermoplastic resin with a lower melting point constitutes the sheath, the core/sheath combination includes, for example, polyethylene terephthalate/polyethylene, polyethylene terephthalate/polypropylene, polyethylene terephthalate/propylene copolymer, polytrimethylene terephthalate/polyethylene, polybutylene terephthalate/polyethylene, polyethylene terephthalate/copolymerized polyester (for example, polyethylene terephthalate copolymerized with isophthalic acid), polypropylene/ethylene-acrylic acid copolymer, and polylactic acid/polybutylene succinate. These combinations can also be applied to composite fibers other than core-sheath type composite fibers. Core-sheath type composite fibers in which the sheath is polyethylene (for example, high-density polyethylene, low-density polyethylene, or linear low-density polyethylene) or copolymerized polyester have the property that the sheath melts or softens when heat-treated at a temperature equal to or higher than the melting point of the thermoplastic resin that constitutes the sheath, bonding the fibers together and forming bonding points.

When the synthetic fiber is derived from a splittable composite fiber, examples of the resin combinations constituting each section of the splittable composite fiber include those exemplified as the core/sheath combinations of the core-sheath composite fiber. In particular, examples of the resin combinations constituting the splittable composite fiber include polyethylene terephthalate/polyethylene, polyethylene terephthalate/ethylene-propylene copolymer, polypropylene/polyethylene, polylactic acid/polybutylene succinate, etc. (Polyethylene is any one of high-density polyethylene, low-density polyethylene, and linear low-density polyethylene, or a combination thereof). The combination of resins constituting the splittable composite fiber also affects the splitting, and generally, a combination of polymers of different systems (such as polyolefin, polyester, and polyamide systems) gives a splittable composite fiber that is easier to split.

The thermoplastic resins exemplified as components of the single fiber or composite fiber may contain other components as long as they contain 50% by mass or more of the specifically indicated thermoplastic resin. For example, in the combination of polyethylene/polyethylene terephthalate, the "polyethylene" may contain other thermoplastic resins and additives, etc., so long as it contains 50% by mass or more of polyethylene. This also applies to the following examples.

The adhesive fiber may include two or more fibers. In this case, the melting points of the adhesive components of these fibers may be different from each other. For example, when two types of adhesive fibers are included, the difference in melting points of the adhesive components of these fibers may be 10°C or more and 40°C or less, and in particular 15°C or more and 30°C or less.

The fineness of the adhesive fiber may be, for example, from 1.0 dtex to 7.8 dtex, in particular from 1.4 dtex to 6.7 dtex, and more particularly from 2.2 dtex to 4.5 dtex.
When the fineness of the adhesive fiber is within the above-mentioned range, the obtained nonwoven fabric tends to have suitable strength and soft feel.

In particular, the fineness of the splittable composite fiber is preferably such that when it is split into its components (i.e., when each section becomes a single fiber), it gives ultrafine fibers with a fineness of 0.6 dtex or less, preferably 0.5 dtex or less. In this embodiment, when ultrafine fibers are included as fibers derived from the splittable composite fiber, the nonwoven fabric becomes flexible, and the fine gaps formed between the ultrafine fibers allow liquid to be well retained.

To generate such ultrafine fibers, the fineness of the splittable composite fiber may be, for example, 1 dtex to 9 dtex, more particularly 1.5 dtex to 3.5 dtex, and even more particularly 1.5 dtex to 2.5 dtex. There is no particular lower limit to the fineness of the ultrafine fiber, but it is preferably 0.05 dtex or more.

The fiber diameter of the adhesive fiber may be, for example, 10 μm to 33 μm, particularly 12 μm to 30 μm, and more particularly 15 μm to 25 μm.
When the fiber diameter of the adhesive fiber is within the above range, the nonwoven fabric tends to have appropriate strength and soft feel.

The fiber length of the adhesive fiber may be, for example, from 25 mm to 100 mm, in particular from 30 mm to 70 mm, and more particularly from 35 mm to 60 mm.
When the fiber length of the adhesive fiber is within the above range, the fiber entanglement is likely to be favorable. In particular, when a nonwoven fabric is produced by the method described below, a fiber length within the above range allows a more appropriate number of bonding points to be formed on one fiber in the bonding step.

The adhesive fibers are contained in the nonwoven fabric of this embodiment at 20% by mass or more. By making the proportion of adhesive fibers 20% by mass or more, the number of bonding points in the nonwoven fabric can be made appropriate, and the stress during elongation at a low elongation rate (particularly 10%) of the obtained nonwoven fabric can be improved. The proportion of adhesive fibers may be 40% by mass or more, particularly 60% by mass or more, and more particularly 80% by mass or more. Alternatively, the nonwoven fabric of this embodiment may be composed only of adhesive fibers. Furthermore, the nonwoven fabric may be composed only of fibers derived from splittable composite fibers. Since fibers derived from splittable composite fibers contain ultrafine fibers, the area of the bonding points tends to be small. Therefore, even if the nonwoven fabric is composed only of fibers derived from splittable composite fibers, the touch of the nonwoven fabric is not likely to be hard.

(Cellulosic Fibers)
The nonwoven fabric of the present embodiment may contain fibers other than the adhesive fibers, for example, cellulosic fibers. Cellulosic fibers are generally hydrophilic, and therefore when contained in a nonwoven fabric, they serve to improve the liquid retention of the nonwoven fabric. Therefore, the following will describe cellulosic fibers.

"Cellulosic fibers" are also called cellulose fibers and generally refer to fibers made from cellulose.
Cellulosic fibers include, for example:
(1) Natural fibers derived from plants, such as cotton, flax, flax, ramie, jute, banana, bamboo, kenaf, shell ginger, hemp, and kapok;
(2) Regenerated fibers such as viscose rayon and polynosic rayon, cupra obtained by the cuprammonium process, and Tencel (registered trademark) and Lyocell (registered trademark) obtained by the solvent spinning process;
(3) cellulose fibers obtained by melt spinning; and (4) semi-synthetic fibers such as acetate fibers. The type of cellulosic fiber is not particularly limited.

The fineness of the cellulosic fibers may be, for example, from 0.6 dtex to 5.6 dtex, in particular from 1.0 dtex to 4.4 dtex, and more particularly from 1.4 dtex to 3.3 dtex.
When the fineness of the cellulose-based fiber is within the above-mentioned range, the strength of the nonwoven fabric can be made appropriate, and the texture of the nonwoven fabric is also good. When the fineness is too small, the strength of the nonwoven fabric may be low. When the fineness is too large, the texture of the nonwoven fabric may be reduced. The fineness of the cellulose-based fiber also affects the entanglement of the fibers when the nonwoven fabric is produced by the method described below (especially the method in which the entanglement treatment includes a water flow entanglement treatment). When the fineness of the cellulose-based fiber is within the above-mentioned range, the degree of entanglement is appropriate. When the degree of entanglement is too high, the bulkiness of the nonwoven fabric may decrease, the touch may decrease, or the liquid retention may decrease. When the degree of entanglement is too low, the stress during elongation may be low.

The fiber diameter of the cellulosic fibers may be, for example, 5 μm to 25 μm, particularly 8 μm to 20 μm, and more particularly 10 μm to 17 μm.
When the fiber diameter of the cellulose-based fiber is within the above range, the strength of the nonwoven fabric can be made appropriate, and the texture of the nonwoven fabric can also be good. If the fiber diameter is too small, the strength of the nonwoven fabric can be reduced. If the fiber diameter is too large, the texture of the nonwoven fabric can be reduced. The fiber diameter of the cellulose-based fiber also affects the entanglement of the fibers. When the fiber diameter of the cellulose-based fiber is within the above range, the degree of entanglement can be made appropriate when the nonwoven fabric is produced by the method described below (especially the method in which the entanglement treatment includes a water flow entanglement treatment). If the degree of entanglement is too high, the bulkiness of the nonwoven fabric can be reduced, and if the degree of entanglement is too low, the stress during elongation can be reduced.

The fiber length of the cellulosic fibers may be, for example, 25 to 100 mm, in particular 30 to 70 mm, and more particularly 35 to 60 mm.
When the fiber length of the cellulosic fiber is within the above range, the entanglement of the fibers is likely to be favorable when a nonwoven fabric is produced by a method described below (particularly a method in which the entanglement treatment includes a hydroentanglement treatment). In particular, in the production method of the present embodiment, when the fiber length is within the above range, a more appropriate number of bonding points can be formed on one fiber in the bonding step.

The cross section of the cellulosic fiber (transverse section, or cross section perpendicular to the length of the fiber) may be circular or noncircular. Examples of noncircular shapes include ellipse, Y-shape, X-shape, well-shape, multi-lobed shape, polygonal shape, star shape, and chrysanthemum shape. When the cross section of the fiber is circular, the adhesion area with the adhesive fiber is relatively small, so the texture of the nonwoven fabric can be softer than when fibers with a noncircular shape are used. When the cross section of the fiber is noncircular, the adhesion area with the adhesive fiber is relatively large, so the strength of the nonwoven fabric can be increased.

As the cellulose-based fiber, chemical fibers such as regenerated fibers or semi-synthetic fibers may be used. The variation in fineness and/or fiber diameter, as well as fiber length, of chemical fibers is smaller than that of natural fibers, so that it is easier to adjust the degree of entanglement of the nonwoven fabric. In addition, regenerated fibers such as rayon and solvent-spun cellulose fibers have a good balance between the softness and strength when wet, and it is easier to obtain a softness and strength suitable for the texture of the nonwoven fabric, which is preferable. In addition, solvent-spun cellulose fibers have a relatively high single fiber strength, so that they are preferable in that the strength of the nonwoven fabric is improved.
The cellulosic fibers can be used alone or in combination.

The cellulosic fibers may be surface-treated to change the degree of hydrophilicity or hydrophobicity of the surface. The surface treatment is generally a treatment in which an oil agent (surfactant) is attached to the fiber surface. The degree of hydrophilicity or hydrophobicity of the surface of the cellulosic fibers can be evaluated, for example, using values such as the sedimentation rate of the fibers. The surface treatment may be one that makes the surface more hydrophilic (hydrophilization treatment) or one that makes the surface less hydrophilic (hydrophobization treatment).

The settling velocity (or settling time (seconds)) of the cellulosic fibers used in this embodiment may be, for example, 30 seconds or less, particularly 20 seconds or less, and more particularly 10 seconds or less. The smaller the settling velocity (or settling time) of the cellulosic fibers, the higher the entanglement of the cellulosic fibers tends to be.

The settling velocity of the fibers can be measured by the following method.
17 g of fiber to be measured for sedimentation velocity is collected. The collected fiber is opened (using a parallel carding machine) to form a carded web. 5 g of the carded web is weighed and packed into a cage (cylindrical, diameter 5 cm, height 8 cm, mass of cage body 3 g) made of copper wire (thickness 0.55 mm).
Next, prepare a thermostatic water bath, fill it with tap water, and set it to 25°C. When the water temperature reaches 25°C, stop stirring the thermostatic water bath and start measuring the sedimentation rate. Gently drop the basket filled with the fibers as described above from a position 1 cm above the water surface, and start the stopwatch as soon as the basket hits the water surface. The fibers gradually absorb water, and the stopwatch is stopped as soon as the basket, which is 8 cm high, completely sinks below the water surface. The time from when the basket hits the water surface to when it sinks below the water surface is taken as the sedimentation rate, and the average of the two measurements is taken as the sedimentation rate of the fiber.

(Other fibers)
The nonwoven fabric of the present embodiment may contain fibers other than cellulosic fibers and adhesive fibers (hereinafter, "other fibers"). The other fibers are, for example, natural fibers that are not cellulosic fibers (e.g., wool, silk, etc.) and synthetic fibers that are not adhesive fibers (e.g., synthetic fibers that do not melt or soften when the adhesive component of the adhesive fiber is melted and do not exhibit adhesiveness), and are not particularly limited.

The other fibers may be contained in an amount of 35% by mass or less, particularly 25% by mass or less, and more particularly 10% by mass or less, when the total amount of fibers constituting the nonwoven fabric is taken as 100% by mass.

(Configuration of nonwoven fabric)
One example of the nonwoven fabric of this embodiment is a nonwoven fabric that contains 20 mass% or more of adhesive fibers as described above, in which the fibers are bonded to each other and entangled with each other, has a basis weight of 15 g/ ^m2 or more and 40 g/ ^m2 or less, a breaking elongation (DRY) in the CD direction of 80% or more, and a water retention of 900% or more.

Another example of the nonwoven fabric of this embodiment is a nonwoven fabric that contains 20 mass% or more of adhesive fibers as described above, the fibers are bonded to each other and are entangled with each other, has a basis weight of more than 40 g/ ^m2 and not more than 70 g/ ^m2 , has a breaking elongation (DRY) in the CD direction of 80% or more, and has a bending resistance (DRY)/thickness (loaded at 1.96 kPa) of 56.0 or more and 100 or less.

The fibers are bonded together by adhesive fibers. At the bonded points where the fibers are bonded together, the components of the adhesive fibers melt or soften and then solidify again to form bonded areas. As described below, the fibers may be entangled by, for example, a hydroentanglement process.

The nonwoven fabric of this embodiment is made by integrating the fibers through bonding and entanglement, so it has the characteristics of both, and when manufactured by the method described below, the entanglement process is carried out after the bonding process, so that the adhesion is eliminated at the points that were once bonded. Therefore, compared to nonwoven fabrics manufactured by carrying out the bonding process after the entanglement process, the nonwoven fabric is softer and tends to have more interfiber voids.

More specifically, the nonwoven fabric of this embodiment ensures its mechanical strength through bonding and entanglement, and therefore has a relatively high breaking elongation in the CD direction (horizontal direction) and a soft texture compared to a fabric in which mechanical strength is ensured only by bonding. On the other hand, the nonwoven fabric of this embodiment has fibers that are fixed to each other to a certain extent by bonding, and therefore has a higher resistance to elongation than a nonwoven fabric in which the fibers are integrated only by entanglement, and exhibits a relatively large stress at 10% elongation.

The nonwoven fabric of this embodiment exhibits a breaking elongation (DRY) of 80% or more in the CD direction when its basis weight is 15 g/ ^m2 or more and 70 g/ ^m2 or less. Here, "DRY" indicates that the nonwoven fabric is measured in a state where it is not impregnated with liquid. The breaking elongation (DRY) in the CD direction may be particularly 100% or more. The breaking elongation (DRY) in the CD direction is preferably 200% or less. When the breaking elongation (DRY) in the CD direction exceeds 200%, the stress at 10% elongation tends to be low.

The basis weight of the nonwoven fabric of this embodiment may particularly be 20 g/m ² or more and 60 g/m ² or less, and more particularly may be 30 g/m ² or more and 50 g/m ² or less.

The nonwoven fabric of this embodiment may have a MD breaking elongation (DRY) of, for example, 40% or more, particularly 50% or more, and more particularly 60% or more. Such a MD breaking elongation (DRY) can also characterize the nonwoven fabric of this embodiment.

For example, when the nonwoven fabric of this embodiment contains fibers derived from splittable composite fibers as adhesive fibers, the higher the degree of splitting of the splittable composite fibers (i.e., the higher the splitting rate), the lower the MD breaking elongation (DRY) of the nonwoven fabric. When manufacturing a nonwoven fabric by the method described below, the entanglement process can be performed in a state in which the fibers are fixed to each other to some extent by the bonding process, and the strength of the nonwoven fabric can be secured to some extent by bonding, so there is no need to increase the degree of entanglement of the nonwoven fabric. Therefore, the splitting of the splittable composite fibers is less likely to progress, and the MD breaking elongation (DRY) is less likely to decrease. Even when the MD breaking elongation (DRY) is low, the nonwoven fabric tends to become hard, so by setting the MD breaking elongation (DRY) in the above range, a soft nonwoven fabric can be obtained, in combination with a CD breaking elongation (DRY) of 80% or more.

As described above, the nonwoven fabric of this embodiment has more interfiber voids and tends to be bulkier than nonwoven fabrics produced by carrying out a bonding process after an entanglement process, and is therefore more likely to exhibit a high water retention rate. In particular, the nonwoven fabric of this embodiment exhibits a high water retention rate when the basis weight is relatively small. Specifically, when the nonwoven fabric of this embodiment has a basis weight of 15 g/m ² or more and 40 g/m ² or less, it exhibits a water retention rate of 900% or more when the water retention rate is measured by the method described in the examples below. In this embodiment, the water retention rate of a nonwoven fabric with a relatively low basis weight may be particularly 1000% or more, more particularly 1200% or more.

When the nonwoven fabric of this embodiment has a relatively high basis weight, for example, when the basis weight is more than 40 g/ ^m2 and 70 g/ ^m2 or less, the nonwoven fabric exhibits a water retention rate of, for example, 700% or more when the water retention rate is measured by the method described in the Examples below. In this embodiment, the water retention rate of the nonwoven fabric having a relatively high basis weight may particularly be 800% or more, more particularly may be 900% or more, and even more particularly may be 1000% or more.
The water retention rate tends to be higher when the adhesive fiber is not derived from a splittable composite fiber and/or when no cellulosic fiber is included, regardless of the basis weight.

The nonwoven fabric of this embodiment is also characterized by the value obtained by dividing the bending resistance (DRY) by the thickness measured under a load of 1.96 kPa (bending resistance/thickness (1.96 kPa load)). Specifically, when the nonwoven fabric of this embodiment has a basis weight of more than 40 g/m ² and not more than 70 g/m ² , the thickness and bending resistance (DRY) of the nonwoven fabric are measured by the method described in the examples below, and the bending resistance (DRY)/thickness (1.96 kPa load) is calculated from them, and the value is 56.0 to 100. In the nonwoven fabric of this embodiment, the bending resistance (DRY)/thickness (1.96 kPa load) may particularly be 60 or more, more particularly 70 or more. The upper limit of the bending resistance (DRY)/thickness (1.96 kPa load) may be, for example, 98.0.

Alternatively, the nonwoven fabric of this embodiment exhibits a bending resistance (DRY)/thickness (1.96 kPa load) of 10.0 to 65.0 when the basis weight is relatively small, for example, when the basis weight is 15 g/m ² or more and 40 g/m ² or less. In this embodiment, the bending resistance (DRY)/thickness (1.96 kPa load) of a nonwoven fabric having a relatively low basis weight may be particularly 15.0 or more, more particularly 50.0 or more. The upper limit of the bending resistance (DRY)/thickness (1.96 kPa load) may be, for example, 60.0.

Since the stiffness is affected by the thickness of the nonwoven fabric, stiffness (dry)/thickness (loaded at 1.96 kPa) is an index of the softness of the nonwoven fabric excluding the effect of the thickness of the nonwoven fabric. Therefore, the smaller this value, the softer the nonwoven fabric is, and for example, when used as a face mask, it has good conformity to the skin. The larger this value, the harder the nonwoven fabric is, and for example, when used as a face mask, it tends to have poor adhesion to the skin.

The nonwoven fabric of this embodiment also exhibits a relatively high stress at 10% elongation. Specifically, when the nonwoven fabric of this embodiment has a basis weight of 15 g/m ² or more and 70 g/m ² or less, it may exhibit a stress at 10% elongation (DRY) of 0.23 N/5 cm or more. The stress at 10% elongation (DRY) in the CD direction may be particularly 0.25 N/5 cm or more, more particularly 0.3 N/5 cm or more, even more particularly 0.4 N/5 cm or more, and even more particularly 0.5 N/5 cm or more. The upper limit of the stress at 10% elongation (DRY) in the CD direction may be, for example, 1.00 N/5 cm or less, particularly 0.8 N/5 cm or less, and more particularly 0.6 N/5 cm or less. The stress at 10% elongation in the CD direction tends to be higher when the adhesive fiber is not a fiber derived from a splittable conjugate fiber, but is, for example, a core-sheath type conjugate fiber.

When the nonwoven fabric of this embodiment contains adhesive fibers and cellulosic fibers, it may have a fiber density of, for example, 0.01 to 0.20 g/cm ³ when dry, preferably 0.02 to 0.15 g/cm ³ , and more preferably 0.03 to 0.14 g/cm ^3. The fiber density of the entire nonwoven fabric can be determined from the basis weight and thickness (thickness measured with a load of 1.96 kPa applied).

When the nonwoven fabric of this embodiment is made only of adhesive fibers, it may have a fiber density of, for example, 0.01 to 0.20 g/cm ³ when dry, preferably 0.02 to 0.15 g/cm ³ , and more preferably 0.03 to 0.10 g/cm ^3. The fiber density of the entire nonwoven fabric can be determined from the basis weight and thickness (thickness measured when a load of 1.96 kPa is applied).

[Embodiment 2]
(Method of manufacturing nonwoven fabric)
Next, the method for producing the nonwoven fabric described in the first embodiment will be described as a second embodiment.
The manufacturing method of this embodiment is as follows:
A step of preparing a fiber web containing 20% by mass or more of adhesive fibers;
a bonding step of bonding the fibers of the fiber web together with the adhesive fibers;
an entanglement step of entangling the fibers of the fiber web after the bonding step;
Including,
The fiber web subjected to the entangling step has a basis weight of 15 g/m ² or more and 70 g/m ² or less,
The method does not include winding the fibrous web on a roll between the bonding step and the entangling step.
The present invention relates to a method for producing a nonwoven fabric for use as a liquid-impregnated skin application sheet, the nonwoven fabric having a CD breaking elongation (DRY) of 80% or more.

The fiber web can be produced by a known method. The form of the fiber web may be any form such as a parallel web, a cross web, a card web such as a semi-random web or a random web, an air-laid web or a wet-laid paper web. A parallel web is preferable for the form of the fiber web because it makes the surface of the nonwoven fabric smoother.

The preparation of the fiber web may include, for example, preparing a fiber web A and a fiber web B separately. In that case, as described later, for example, the fiber web A may be subjected to a bonding step, and then the fiber web B may be laminated thereon, and the two laminated fiber webs may be subjected to an entanglement step. When a nonwoven fabric is produced by such a method, the fiber web A and the fiber web B may be exactly the same. Alternatively, when two or more types of fibers are used, the fiber web A and the fiber web B may be different from each other in at least one of the mixing ratio, shape, and basis weight. For example, the fiber web A may be made of only adhesive fibers, and the fiber web B may be made of only cellulosic fibers without containing adhesive fibers. In this case, when the entanglement step includes a water flow entanglement treatment, the fibers of the fiber web B are more effectively entangled with the fibers of the fiber web A.
Preparing the fibrous web may include separately preparing three or more fibrous webs on three or more web manufacturing lines.

The basis weight of the fiber web is selected according to the basis weight of the nonwoven fabric to be obtained. For example, if the lamination step of the fiber webs is not included after the bonding step and before the intertwining step, the basis weight of the fiber web will be the same as the basis weight of the fiber web to be obtained. If the lamination step is included, the basis weight is selected so that the combined basis weight of fiber web A and fiber web B will be the same as the basis weight of the nonwoven fabric to be obtained, and the ratio of adhesive fibers to other fibers to the total fibers contained in each fiber web is the desired ratio. For example, if fiber web A is composed only of adhesive fibers and fiber web B is composed only of other fibers, the basis weight ratio of fiber web A and fiber web B will be the mixture ratio of adhesive fibers to other fibers, so the basis weight is selected taking this into consideration.

For example, when the fiber web A is composed only of adhesive fibers and the fiber web B is composed only of cellulosic fibers, the basis weight of the fiber web A may be 8 g/ ^m2 or more and 35 g/ ^m2 or less, and the basis weight of the fiber web B may be 7 g/ ^m2 or more and 35 g/ ^m2 or less, and in particular, the basis weight of the fiber web A may be 10 g/ ^m2 or more and 30 g/ ^m2 or less, and the basis weight of the fiber web B may be 10 g/ ^m2 or more and 30 g/ ^m2 or less. If the basis weight of the fiber web A is too small, the soft touch of the nonwoven fabric may decrease, and if the basis weight of the fiber web B is too small, the water retention of the nonwoven fabric may decrease.

(Bonding process)
Next, the bonding process will be described.
The bonding step is a step in which fibers are bonded to each other by adhesive fibers contained in the fiber web to form bonded portions.

The bonding process may be, for example, a thermal bonding process. The thermal bonding process is a process in which the fiber web is heat-treated to melt or soften the component with the lowest melting point (thermal bonding component) among the resin components that make up the adhesive fiber, thereby forming bonding points by bonding the fibers that make up the fiber web together.

The heat treatment may be, for example, a hot air processing treatment in which hot air is blown, a heat roll processing (for example, a hot embossing roll processing), or a treatment using infrared rays. In order to make the resulting nonwoven fabric bulky, a hot air processing treatment is preferred. The hot air processing treatment may be carried out using a device that blows hot air of a predetermined temperature onto the fiber web, for example, a hot air penetration type heat treatment machine and a hot air blowing type heat treatment machine. In hot air processing using these devices, pressure is not easily applied in the thickness direction of the fiber web, so the resulting nonwoven fabric tends to be bulky.

When the bonding process is a hot air processing treatment, it is preferable to blow hot air multiple times. Furthermore, when blowing hot air multiple times, it is preferable that the temperature of the second hot air is higher than the temperature of the first hot air. Since the adhesion between the cellulosic fiber and the adhesive fiber is not higher than the adhesion between the adhesive fibers themselves, it is effective to blow hot air multiple times to further increase the adhesion between the cellulosic fiber and the adhesive fiber.

When the bonding process is a hot air processing process, the speed of the hot air may be, for example, 0.1 m/min to 3.0 m/min, particularly 0.2 to 2.5 m/min, and more particularly 0.3 m/min to 2.0 m/min, in order to ensure the strength and bulkiness of the nonwoven fabric. If the hot air speed is too low, the fibers may not be bonded well to each other throughout the fiber web, and if it is too high, the bulkiness may be impaired.

The temperature of the heat treatment may be the temperature at which the component (thermal adhesive component) with the lowest melting point among the resin components constituting the adhesive fiber softens or melts, and may be, for example, a temperature equal to or higher than the melting point of the component. For example, when the component with the lowest melting point among the resin components constituting the adhesive fiber is high-density polyethylene, hot air at a temperature of 130°C to 150°C may be blown when hot air processing is performed. For example, when the component with the lowest melting point among the resin components constituting the adhesive fiber is an ethylene-acrylic acid copolymer, hot air at a temperature of 90°C to 140°C may be blown, particularly hot air at a temperature of 95°C to 130°C, and more particularly hot air at a temperature of 100°C to 120°C may be blown when hot air processing is performed. From the viewpoint of a good texture of the nonwoven fabric, the heat treatment temperature is preferably 0°C to 5°C higher than the melting point or softening point of the thermal adhesive component, more preferably 1°C to 4°C higher, and even more preferably 2°C to 3°C higher.

The bonding process may involve irradiation with an electron beam or ultrasonic welding. These bonding processes also allow the resin components that make up the adhesive fibers to bond the fibers together.

If the fiber web after the bonding process has a breaking strength (DRY) in the MD direction of, for example, 1.0 N/5 cm or more, it is likely to give a nonwoven fabric with sufficient bonding. The breaking strength (DRY) in the MD direction may be particularly 2.0 N/5 cm or more, more particularly 3.0 N/5 cm or more. Furthermore, the fiber web after the bonding process may have a stiffness (DRY) of 100 g or less, measured by the method described in the Examples, for example. In that case, it is easy to finally obtain a nonwoven fabric with a soft feel. The stiffness (DRY) may be particularly 80 g or less, more particularly 60 g or less.

(Cooling process)
The fiber web subjected to the bonding step may be subjected to a cooling step before being subjected to the entangling step. If the fiber web after the bonding step is subjected to the next entangling step in a state in which some of the adhesive fibers are softened or melted, excessive peeling may occur at the bonded parts, and as a result, the strength of the nonwoven fabric may decrease, or resin pieces may be easily generated. Therefore, in the cooling step, the fiber web may be cooled until the adhesive components are solidified. The cooling step may be natural cooling (cooling) or active cooling using a cooling device. The cooling method may be air cooling or water cooling. Natural cooling may be performed by running the fiber web on a belt or between rolls until the fiber web after the bonding step is sufficiently cooled.

(Intertwining process)
Next, the intertwining step will be described.
The entanglement step is a step of carrying out a treatment to entangle the fibers in the fiber web after the bonding step. In this embodiment, after the bonding step, the fiber web is subjected to the entanglement step without being wound up on a roll. This makes it easier for the fibers to be entangled, and also makes it possible to increase the bulk of the resulting nonwoven fabric.

The entanglement process is, for example, a needle punch process or a high-pressure fluid flow (particularly a water flow) entanglement process. In a high-pressure fluid flow process, the high-pressure fluid is, for example, a high-pressure gas such as compressed air, or a high-pressure liquid such as high-pressure water. In the manufacture of nonwoven fabrics, a water flow entanglement process using high-pressure water as the high-pressure fluid is often used, and in this embodiment, the water flow entanglement process is preferably used from the viewpoint of ease of implementation. The following describes the entanglement process when high-pressure water (hereinafter also simply referred to as "water flow") is used as the high-pressure fluid.

The hydroentanglement treatment can be carried out, for example, by spraying a water stream with a water pressure of 1 MPa to 15 MPa from a nozzle having orifices with a hole diameter of 0.05 mm or more and 0.5 mm or less spaced at intervals of 0.3 mm to 1.5 mm onto each of the front and back surfaces of the fiber web, 1 to 5 times. The water pressure is preferably 1 MPa to 10 MPa, more preferably 1 MPa to 7 MPa, and particularly preferably 1 MPa to 6 MPa.

The hydroentanglement treatment can be carried out by placing the fiber web on a support and spraying a columnar water stream onto the support. If the nonwoven surface is flat and has no irregularities, the support should have no openings with an opening area of more than 0.2 ^mm2 each and no protrusions or patterns. For example, the support should have a plain weave of 80 mesh or more and 100 mesh or less.
The hydroentanglement treatment may be carried out by spraying water onto only one side of the fibrous web.

When the bonding step is a hot air processing step, the hydroentanglement treatment is preferably carried out by first spraying a columnar water stream against the surface to which hot air was blown in the hot air processing step (hereinafter referred to as the "hot air blown surface"), and then spraying a columnar water stream against the opposite surface.
The surface onto which the hot air is blown tends to have a lower fiber density than the opposite surface (generally the surface in contact with the support during the hot air processing), and entanglement by the columnar water stream is relatively easy to proceed. The strength of the nonwoven fabric obtained by the water stream entanglement treatment is likely to depend on the degree of entanglement in the initial entanglement treatment. Therefore, it is preferable to spray the columnar water stream from the side of the fiber web where the fiber density is relatively low and where entanglement is relatively easy to proceed.

For example, when fiber web A and fiber web B are prepared separately, fiber web A is subjected to a bonding process, fiber web B is laminated thereon, and the laminated web is subjected to a hydroentanglement process in the entanglement process, it is preferable to spray the columnar water flow from the hot air blowing surface side of fiber web A first. Therefore, for example, when fiber web B is laminated on the hot air blowing surface of fiber web A, it is preferable to spray the columnar water flow from the fiber web B side first.

In the interlacing step, the bonded portions may be destroyed due to the impact of the jet of water. Such destruction does not occur in nonwoven fabrics manufactured by carrying out the bonding step after the interlacing step, and may characterize the manufacturing method of this embodiment. Destruction of the bonded portions increases the degree of freedom of the fibers, making the nonwoven fabric more flexible and increasing the interfiber voids to increase the water retention rate of the nonwoven fabric. Furthermore, it is believed that the increased degree of freedom of the fibers can increase the adhesion of the liquid-impregnated nonwoven fabric to the skin.

[Embodiment 3]
(Manufacturing method including lamination process)
The manufacturing method of the third embodiment of the present disclosure includes a lamination step in which a fiber web A and a fiber web B are prepared separately, only the fiber web A is subjected to a bonding step, and the fiber web B is laminated on the fiber web A after the bonding step to obtain a laminated web. In the manufacturing method of the third embodiment, the laminated web is subjected to an entanglement step. The fiber web to be subjected to the entanglement step has a part (fiber web B) in which no bonding portion is formed, so that entanglement tends to progress further when a water flow is sprayed thereon. In particular, when the fiber web B contains or is composed only of cellulosic fibers, entanglement is more likely to progress. Therefore, even if the water pressure of the water flow used in the entanglement step is lowered or the proportion of cellulosic fibers is reduced, sufficient entanglement is easily achieved.

In the manufacturing method of embodiment 3, the conditions of the bonding process, the entanglement process, and the post-entanglement bonding process are the same as those described in relation to the manufacturing method of embodiment 2, so the description thereof will be omitted here. However, the conditions of these processes are appropriately adjusted depending on the type and ratio of fibers contained in the fiber webs A and B, and their basis weights.

In the manufacturing method of this embodiment, when fiber web B consists only of adhesive fibers and fiber web A consists only of cellulosic fibers, the resulting nonwoven fabric is a kind of laminated nonwoven fabric, with a higher proportion of adhesive fibers on one surface and a higher proportion of cellulosic fibers on the other surface. Also, when fiber webs A and B are produced in this manner, the resulting nonwoven fabric is a kind of laminated nonwoven fabric, with a higher proportion of adhesive fibers on one surface and a higher proportion of cellulosic fibers on the other surface.

(Liquid-impregnated skin covering sheet)
The nonwoven fabric of embodiment 1 is impregnated with a liquid to form a liquid-impregnated skin covering sheet for covering the skin of a human or animal. 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 humans, such as a face mask for humans, a keratin care sheet, and a décolleté sheet, the liquid (e.g., a cosmetic) containing an active ingredient may be impregnated in an amount of 600 parts by mass or more and 2500 parts by mass or less, particularly 600 parts by mass or more and 1500 parts by mass or less, and more particularly 700 parts by mass or more and 1500 parts by mass or less, relative to 100 parts by mass of the nonwoven fabric. The active ingredient may be, for example, a moisturizing ingredient, a keratin softening ingredient, an antiperspirant ingredient, a fragrance ingredient, a whitening ingredient, a blood circulation promoting ingredient, an ultraviolet ray prevention ingredient, and a slimming ingredient, but is not limited thereto.

The face mask is provided in a shape suitable for covering the face, and further in a form in which, for example, openings or cutouts are provided by punching as necessary in areas corresponding to the eyes, nose, and mouth. Alternatively, the face mask may be shaped to cover only a portion of the face (e.g., the eyes, mouth, nose, or cheeks). Alternatively, the face mask may be provided as a set consisting of a sheet covering the area around the eyes and a sheet covering the area around the mouth, or as a set of sheets separately covering three or more areas.

The keratin care sheet is a skin covering sheet used on the heels, elbows, knees, etc., where the keratin is thick and prone to hardening. By impregnating it with a liquid containing a keratin softening component and a moisturizing component, the sheet exhibits the effect of promoting moisturization and softening of the keratin, and promoting the removal of excess keratin. The nonwoven fabric of this embodiment can be used as a substrate in keratin care sheets that exhibit either of these effects and efficacy. A keratin care sheet, for example a keratin care sheet for the heel, is provided in a form having cuts and/or notches and/or openings punched out of parts of the sheet so that the sheet can easily conform to the curve of the heel when applied.

Alternatively, the liquid-impregnated skin covering sheet may be used as a cleansing sheet containing a cleansing component as an active ingredient. The cleansing sheet may be used, for example, by adhering it to the part (skin) from which dirt (makeup) is to be removed, keeping it attached for a while so that the cleansing component blends with the makeup, and then wiping off the makeup. Like face masks, cleansing sheets can be said to be a type of liquid-impregnated skin covering sheet for personal use. However, unlike face masks used for the purpose of allowing active ingredients to act on the skin, the cleansing sheet is applied to the skin to blend with the makeup, so the time the cleansing sheet is applied to the skin is generally shorter than that of a face mask. When used as a cleansing sheet, the nonwoven fabric may be impregnated with a liquid (e.g., a cosmetic) containing an active ingredient in an amount of 100 to 700 parts by weight, more particularly 200 to 600 parts by weight, per 100 parts by weight of the nonwoven fabric.

The liquid-impregnated skin covering sheet may be a moisturizing sheet impregnated with a liquid containing a moisturizing ingredient or other active ingredient, which is used to moisturize or otherwise care for any part of the body (e.g., the neck, the back of the hand, or the area from the neck to the chest (also called the décolleté)). Alternatively, the liquid-impregnated skin covering sheet may be a slimming sheet impregnated with a liquid containing a slimming ingredient. The slimming sheet is used by being attached to the thighs or abdomen, for example.

The liquid-impregnated skin application sheet may be provided in a state where the nonwoven fabric substrate is folded. The folding may be performed only in one direction of the nonwoven fabric, or may be performed once or more in each of different directions of the nonwoven fabric. For example, the liquid-impregnated nonwoven fabric may be provided by folding it once or more in a direction parallel to the longitudinal direction (i.e., so that the folds are parallel to the longitudinal direction) and once or more in a direction parallel to the lateral direction (i.e., so that the folds are parallel to the lateral direction).

The liquid-impregnated skin application sheet of this embodiment is easy to handle because it is made of a nonwoven fabric that has a relatively large stress at 10% elongation. In addition, the sheet exhibits good liquid retention, excellent flexibility, and good adhesion to the skin, due to the bulkiness of the nonwoven fabric base material and the relatively high degree of freedom of the constituent fibers.

The liquid-impregnated skin application sheet may be provided by storing multiple sheets in one packaging bag or container. For such products, it may be desirable to store more sheets in one packaging bag or container. The nonwoven fabric of embodiment 1 can be provided as a thin sheet having a relatively small basis weight of 15 g/m ² to 40 g/m ² , and therefore meets such a demand.

The fibers used to manufacture the nonwoven fabrics in the Examples and Comparative Examples are shown below.
Fiber 1-1 (adhesive fiber): A splittable composite fiber having a fineness of 2.2 dtex and a fiber length of 51 mm (volume ratio 50:50 (polyethylene terephthalate:high density polyethylene)) (product name DFS (SH), manufactured by Daiwabo Polytech Co., Ltd.) consisting of a combination of polyethylene terephthalate (melting point 255°C)/high density polyethylene (melting point 130°C), having a cross section in which polyethylene terephthalate sections and high density polyethylene sections are alternately arranged in a chrysanthemum shape, and having a total number of sections of 8.
Fiber 1-2 (adhesive fiber): A concentric core-sheath type composite fiber (volume ratio 37:63 (core:sheath)) having a polyethylene terephthalate core and a high-density polyethylene (melting point: about 133°C) sheath, with a fineness of 2.2 dtex and a fiber length of 51 mm (NBF (SH) (product name) manufactured by Daiwabo Polytec Co., Ltd.).
Fiber 2 (cellulosic fiber): Viscose rayon fiber having a fineness of 1.7 dtex and a fiber length of 40 mm (Corona CD (trade name) manufactured by Daiwabo Rayon Co., Ltd.).

<Production of nonwoven fabric of Example 1>
[Adhesion process/cooling process/lamination process]
A fiber web having a target density of 30 g/ ^m2 was produced by blending 60% by mass of fiber 1-1 and 40% by mass of fiber 2 using a parallel carding machine.
The fiber web was heated for about 5 seconds by blowing hot air at 135°C using a hot air penetration type heat treatment machine. This resulted in thermal bonding (adhesive treatment) of the fibers to each other by the high density polyethylene of fiber 1-1. After the thermal bonding (adhesive treatment), the fiber web was subjected to a cooling step by natural cooling in an atmosphere at room temperature of 20°C.

[Intertwining process]
The above-mentioned fiber web was placed on a plain weave net with a warp diameter of 0.132 mm, a weft diameter of 0.132 mm, and a mesh number of 90 meshes. While the fiber web was advanced at a speed of 4 m/min, a columnar water flow with a water pressure of 3.5 MPa was sprayed onto the surface of the fiber web using a water supplier, and a columnar water flow with a water pressure of 3.0 MPa was sprayed onto the opposite surface. The nozzle of the water supplier had orifices with a hole diameter of 0.12 mm provided at intervals of 0.6 mm. The distance between the surface of the laminated fiber web and the orifices was 15 mm. The fiber web after the bonding process was subjected to the entanglement process without being wound up on a roll.

[Drying process]
The fiber web after the entangling step was dried by heating for about 5 seconds using a hot air penetration type heat treatment machine by blowing hot air at 80° C., thereby obtaining a nonwoven fabric of Example 1.

<Production of nonwoven fabrics of Examples 2 and 5>
The nonwoven fabrics of Examples 2 and 5 were obtained in the same manner as the nonwoven fabric of Example 1, except that the mixing ratios of Fiber 1-1 and Fiber 2 were as shown in Table 1, respectively.

<Production of nonwoven fabric of Example 3>
A fiber web consisting only of fiber 1-1 was produced using a parallel carding machine with a target weight of 30 g/ ^m2 , and the nonwoven fabric of Example 3 was obtained in the same manner as the nonwoven fabric of Example 1.

<Production of nonwoven fabric of Example 4>
A nonwoven fabric of Example 4 was obtained in the same manner as in producing the nonwoven fabric of Example 1, except that Fiber 1-2 was used as the adhesive fiber and the mixing ratio of Fiber 1-2 to Fiber 2 was as shown in Table 1.

<Production of Nonwoven Fabrics of Comparative Examples 1 to 4>
The types of fibers used and the blending ratios of the fibers were as shown in Table 2 (in Comparative Example 4, only a fiber web consisting of fiber 1-1 was produced), and the nonwoven fabrics of Comparative Examples 1 to 4 were obtained in the same manner as the nonwoven fabric of Example 1, except that the bonding step and the cooling step were not performed and the entangling step was performed.

<Production of Nonwoven Fabrics of Comparative Examples 5 to 7>
The types of fibers used and the blending ratios of the fibers were as shown in Table 3 (in Comparative Example 7, only a fiber web consisting of fiber 1-1 was produced), and the nonwoven fabrics of Comparative Examples 5 to 7 were obtained in the same manner as the nonwoven fabric of Example 1, except that the bonding step and cooling step were not performed, the entanglement step was performed, and the bonding step was performed instead of the drying step. In the bonding step after the entanglement step, the fibers were heated for about 5 seconds by blowing hot air at 135°C using a hot air penetration type heat treatment machine, and the fibers were thermally bonded (bonded) to each other by the polyethylene of fiber 1-1 or fiber 1-2.

<Production of Nonwoven Fabrics of Comparative Examples 8 and 9>
The types of fibers used and the blending ratios of the fibers were as shown in Table 3 (in Comparative Example 10, only a fiber web consisting of only fiber 1-1 was produced), and the nonwoven fabrics of Comparative Examples 8 and 9 were obtained in the same manner as the nonwoven fabric of Example 1, except that only the bonding step was carried out.

The nonwoven fabric was evaluated as follows.
<Thickness and density of nonwoven fabric>
The thickness of the nonwoven fabric was measured using a thickness gauge (THICKNESS GAUGE Model CR-60A (product name) manufactured by Daiei Scientific Instruments Co., Ltd.) while a load of 294 Pa or 1.96 kPa was applied to the nonwoven fabric.
The density of the nonwoven fabric was calculated based on the basis weight and thickness of the nonwoven fabric.

<Strength and elongation>
The strength and elongation were measured by a constant-speed tension tensile tester in accordance with JIS L 1096:2010 8.14.1 A method (strip method) under the conditions of a sample width of 5 cm, a grip distance of 10 cm, and a tensile speed of 30±2 cm/min, and the load value at break (breaking strength), breaking elongation, and stress at 10% elongation were measured. The tensile test was performed in the longitudinal direction (MD direction) and transverse direction (CD direction) of the nonwoven fabric as the tensile direction. The evaluation results are all shown as the average of the values measured for three samples.
The wet breaking 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.

<Bending resistance>
The bending resistance of the nonwoven fabric was measured in accordance with JIS L 1096:2010 8.21.5 E method (handle-o-meter method). Specifically, the bending resistance was measured by the following procedure.
A sample piece measuring 20 cm in length and 20 cm in width is placed on the sample stage so that the measurement direction of the sample piece is perpendicular to the slot (gap width 10 mm).
Next, the blade of the penetrator, adjusted so that it is 8 mm below the surface of the sample stage, is lowered, and the specimen is pressed into it. When the blade is 6.7 cm (1/3 of the width of the specimen) from one of the sides, the resistance to the pressing is read at different points on the front and back in the vertical and horizontal directions. The maximum value (cN) indicated by the microammeter is read as the resistance value. The total of the maximum values of the four sides is calculated, and the average of the three measurements is taken to determine the bending resistance (cN) of the specimen when dry (DRY).
The bending resistance in the wet state (WET) is measured by impregnating 100 parts by mass of nonwoven fabric with 500 parts by mass of distilled water and placing a polyethylene sheet (23 cm long, 23 cm wide, 0.06 mm thick) under the nonwoven fabric. The bending resistance in the wet state (WET) is determined by subtracting the bending resistance of the polyethylene sheet alone from the measured value.

<Dynamic friction coefficient, coefficient of variation>
The dynamic friction coefficient and the coefficient of variation were measured using a static and dynamic friction measuring instrument (Tribomaster TL201Ts, manufactured by Trinity Lab Co., Ltd.). A nonwoven fabric measuring 5 cm x 10 cm was prepared as a sample piece. The sample pieces were prepared with the MD direction of the nonwoven fabric as the long side and the CD direction as the long side. A tactile contactor (manufactured by Trinity Lab Co., Ltd.) was used as the contact terminal of the measuring instrument. In a state where 100 parts by mass of the sample piece was impregnated with 1000 parts by mass of distilled water, the sample piece was fixed to the measuring table of the measuring instrument (table sliding type) so that the side opposite to the side on which the water flow was sprayed in the entanglement process was facing up, and the contact terminal was moved back and forth twice against the surface of the sample piece with a load of 30 gf, a speed of 10 mm/sec, and a distance of 30 mm. The value of the dynamic friction force in the second round trip was read, and the average value of the forward value and the return value was taken as the dynamic friction force (gf) of one sample piece.

The test piece with the long side in the MD direction was measured three times, and the test piece with the long side in the CD direction was measured three times, and the average value of the total six measurements was taken as the kinetic friction force Fk (gf) of each Example and Comparative Example. The kinetic friction coefficient μk was calculated from the kinetic friction force Fk (gf) and the load (30 gf). In addition, the coefficient of variation CV of the kinetic friction coefficient was calculated according to the following formula from the standard deviation σ of the kinetic friction coefficient obtained during the measurement and the average value μk of the kinetic friction coefficient described above.
Coefficient of variation of dynamic friction coefficient CV = σ/μk

<Adhesion strength>
The adhesion force was measured using a static and dynamic friction measuring instrument (Tribomaster TL201Ts, manufactured by Trinity Lab Co., Ltd.). A nonwoven fabric measuring 12 cm x 5 cm was prepared as a sample piece. The sample pieces were prepared with the long sides in the MD direction and the CD direction of the nonwoven fabric. An artificial skin (24 cm long x 12 cm wide, product name: BIO SKIN PLATE, manufactured and sold by: Viewlux Co., Ltd.) was placed on the measurement table of the measuring instrument (table sliding type).

100 parts by mass of the sample piece was impregnated with 1000 parts by mass of distilled water, and the end of the short side of the sample piece (this part is called the "clip end") was clamped with the clip of the measuring machine to hold it horizontally. The measurement table was moved so that only the area from the end opposite the clip end (this part is called the "non-clip end") to the long side of the sample, which is 8 cm long, overlapped with the artificial skin. The maximum resistance force (N) was read when the measurement table was moved parallel to the long side direction of the sample and away from the clip end at a speed of 10 mm/sec along the long side direction of the sample piece. Three sample pieces were measured for each example, and the average value was calculated and used as the adhesion force (N). The adhesion force was measured on the surface opposite to the surface on which the water flow was sprayed in the entanglement process.

<Water retention rate>
The nonwoven fabric was cut into a length (MD) x width (CD) of 100 mm x 100 mm, the mass of the nonwoven fabric was measured, and then it was immersed in a test liquid (1 liter of distilled water to which 2 drops of dishwashing detergent (product name Joy Sukiyaki Orange Fragrance (surfactant 33%), manufactured by Procter & Gamble) were added) for 2 minutes. The nonwoven fabric soaked in the test liquid was then hung by clamping three corners with clothespins, and the mass was measured after 10 minutes, and the water retention was calculated according to the following formula: Water retention (%) = [(M2-M1)/M1] x 100
M1: Mass (g) of the nonwoven fabric before being impregnated with the test liquid
M2: Mass (g) of the nonwoven fabric after it is soaked in the test liquid and then hung for 10 minutes

<Liquid release amount>
Each test piece (5 x 15 cm, long side in MD direction) was impregnated with an amount of distilled water corresponding to the water retention rate of the test piece. An absorbent sheet (Kimtowel) whose mass had been measured in advance was prepared. The absorbent sheet was stacked, and a test piece impregnated with 1000% distilled water was placed on top of it so that the surface opposite to the surface sprayed with the water flow in the entanglement process faced the absorbent sheet. An acrylic plate was placed on the test piece, and the test piece and the absorbent sheet were pressed with a pressure of 1 g/cm ² by the acrylic plate. The mass of the absorbent sheet was measured 1 minute, 2 minutes, 3 minutes, and 4 minutes after the start of pressure application, and the absorbent sheet was replaced for each measurement, and the mass of distilled water released per minute was calculated from the increase in the mass of the absorbent sheet. The amount of distilled water impregnated in each test piece was taken as the standard (100%), and the release rate of distilled water for each test piece was calculated.

The evaluation results for Examples 1 to 5 and Comparative Examples 1 to 9 are shown in Tables 1 to 3.

The nonwoven fabrics of Examples 1 to 5 all had a higher stress at 10% elongation (DRY) than those of Comparative Examples 1 to 4, in which the fibers were integrated only by the entanglement process. In addition, all of the nonwoven fabrics of the Examples had a high breaking elongation (DRY) in the CD direction, a low bending resistance (DRY) value, and a soft feel. All of the nonwoven fabrics of the Examples had a water retention rate of 900% or more, making them suitable for use as liquid-impregnated skin dressing sheets. Furthermore, all of the nonwoven fabrics of Examples 1 to 5 had good texture. This is thought to be because the entanglement process was performed when the fibers were in a state where they were fixed to a certain extent in the adhesion process, making it difficult for the fiber web to become disordered.

All of the nonwoven fabrics of Comparative Examples 1 to 4 had low stress at 10% elongation (DRY). In addition, the nonwoven fabrics of these Comparative Examples tended to have low water retention, with the water retention of the nonwoven fabrics of Comparative Examples 2 to 4 being less than 900%.

The nonwoven fabrics of Comparative Examples 5 to 7 all had a water retention rate of less than 900%. This is thought to be because the bonding process was carried out after the interlacing process, which increased the number of bonding points and reduced the number of interfiber voids. In addition, the nonwoven fabrics of these Comparative Examples felt harder to the touch than the nonwoven fabrics of the Examples.

In the nonwoven fabrics of Comparative Examples 8 and 9, the fibers were integrated only by adhesion, so the breaking elongation in the CD direction (DRY) was less than 80%, and the fabric felt hard compared to the other Examples and Comparative Examples. For example, when used as a face mask, the fabric did not conform well to the skin.

<Production of nonwoven fabric of Example 6>
[Adhesion process/cooling process/lamination process]
Fiber 1-1 was mixed at 60% by mass and fiber 2 was mixed at 40% by mass to produce fiber web A having a target density of 30 g/ ^m2 using a parallel carding machine. Separately from fiber web A, fiber web B having a target density of 30 g/ ^m2 was produced using only fiber 2 using a parallel carding machine.
The fiber web A was heated for about 5 seconds by blowing hot air at 135°C using a hot air penetration type heat treatment machine. This resulted in the fibers being thermally bonded (adhesive treatment) to each other by the high density polyethylene of the fiber 1-1. After the thermal bonding (adhesive treatment), the fiber web A was subjected to a cooling step by natural cooling in an atmosphere at room temperature of 20°C.
After cooling the fibrous web A, the fibrous web B was laminated onto the side of the fibrous web A to which the hot air had been blown, to obtain a laminated web.

[Intertwining process]
The above-mentioned laminated web was placed on a plain weave net with a warp diameter of 0.132 mm, a weft diameter of 0.132 mm, and a mesh number of 90 meshes. While the laminated web was advanced at a speed of 4 m/min, a columnar water flow with a water pressure of 3.5 MPa was sprayed onto the surface of the fiber web B using a water supply device, and a columnar water flow with a water pressure of 3.0 MPa was sprayed onto the opposite surface. The nozzle of the water supply device had orifices with a hole diameter of 0.12 mm provided at intervals of 0.6 mm. The distance between the surface of the laminated fiber web and the orifices was 15 mm. After the bonding process, both the fiber web A and the laminated web were subjected to the entanglement process without being wound up on a roll.

[Drying process]
The laminated web after the entangling step was dried by heating for about 5 seconds using a hot air penetration type heat treatment machine by blowing hot air at 80° C. onto the laminated web, thereby obtaining a nonwoven fabric of Example 1.

<Production of nonwoven fabrics of Examples 7 and 8>
The nonwoven fabrics of Examples 7 and 8 were obtained in the same manner as the nonwoven fabric of Example 6, except that the mixing ratios of Fiber 1-1 and Fiber 2 in the fiber web A were as shown in Table 4.

<Production of nonwoven fabric of Example 9>
The nonwoven fabric of Example 9 was obtained in the same manner as in the nonwoven fabric of Example 6, except that the blending ratio of fiber 1-1 and fiber 2 in fiber web A was as shown in Table 4, and fiber web B was produced using a blend of fiber 1-1 and fiber 2 in the blending ratio shown in Table 4.

<Production of Nonwoven Fabrics of Comparative Examples 10 to 13>
The nonwoven fabrics of Comparative Examples 10 to 13 were obtained in the same manner as in the nonwoven fabric of Example 6, except that the types of fibers used and the mixing ratios of the fibers were as shown in Table 5, and the bonding step and the cooling step were not performed, but the entanglement step was performed.

The evaluation results for Examples 6 to 9 and Comparative Examples 10 to 13 are shown in Tables 4 and 5.

The stress at 10% elongation (DRY) of the nonwoven fabrics of Examples 6 to 9 was greater than that of Comparative Examples 10 to 13, which had the same fiber composition as the Examples and in which the fibers were integrated only by the entanglement process. Furthermore, all of the nonwoven fabrics of the Examples had a large breaking elongation (DRY) in the CD direction, a small bending resistance (DRY) value, and a soft feel. All of the nonwoven fabrics of the Examples had a bending resistance (DRY)/thickness (load of 1.96 kPa) of 56.0 or more, were soft, and suitable for use as a liquid-impregnated skin dressing sheet. Furthermore, all of the nonwoven fabrics of Examples 6 to 10 had good texture.

The present disclosure includes the following aspects.
(Aspect 1)
A nonwoven fabric for a liquid-impregnated skin covering sheet, comprising 20% by mass or more of adhesive fibers,
In the nonwoven fabric, the fibers are bonded to each other and entangled with each other,
The basis weight is 15 g/ ^m2 or more and 40 g/ ^m2 or less,
The breaking elongation (DRY) in the CD direction is 80% or more,
The water retention rate is 900% or more.
Nonwoven fabric for liquid-impregnated skin covering sheets.
(Aspect 2)
A nonwoven fabric for a liquid-impregnated skin covering sheet, comprising 20% by mass or more of adhesive fibers,
In the nonwoven fabric, the fibers are bonded to each other and entangled with each other,
The basis weight is more than 40 g/ ^m2 and 70 g/ ^m2 or less,
The breaking elongation (DRY) in the CD direction is 80% or more,
The bending resistance (DRY)/thickness (load of 1.96 kPa) is 56.0 or more and 100 or less;
Nonwoven fabric for liquid-impregnated skin covering sheets.
(Aspect 3)
3. The liquid-impregnated skin application sheet according to embodiment 1 or 2, wherein the stress at 10% elongation in the CD direction (DRY) is 0.23 N/5 cm or more and 1.00 N/5 cm or less.
(Aspect 4)
The nonwoven fabric for a liquid-impregnated skin-covering sheet according to any one of Aspects 1 to 3, wherein the adhesive fiber is a fiber derived from a splittable conjugate fiber.
(Aspect 5)
The nonwoven fabric for a liquid-impregnated skin-applying sheet according to any one of Aspects 1 to 4, comprising cellulosic fibers.
(Aspect 6)
A liquid-impregnated skin application sheet, comprising the nonwoven fabric for liquid-impregnated skin application sheets according to any one of aspects 1 to 5, impregnated with a liquid.
(Aspect 7)
A liquid-impregnated skin application sheet, comprising the nonwoven fabric for liquid-impregnated skin application sheets according to any one of Aspects 1 to 6, impregnated with a liquid in a ratio of 100 parts by mass to 2,000 parts by mass.
(Aspect 8)
The liquid-impregnated skin application sheet of embodiment 7, which is a face mask.
(Aspect 9)
A step of preparing a fiber web containing 20% by mass or more of adhesive fibers;
a bonding step of bonding the fibers of the fiber web together with the adhesive fibers;
an entanglement step of entangling the fibers of the fiber web after the bonding step;
Including,
The fiber web subjected to the entangling step has a basis weight of 15 g/m ² or more and 70 g/m ² or less,
The method does not include winding the fibrous web on a roll between the bonding step and the entangling step.
A method for producing a nonwoven fabric for use as a liquid-impregnated skin application sheet, the nonwoven fabric having a CD breaking elongation (DRY) of 80% or more.
(Aspect 10)
A method for producing a nonwoven fabric for a liquid-impregnated skin-application sheet according to Aspect 9, wherein the adhesive fiber is a splittable conjugate fiber.
(Aspect 11)
The method for producing a nonwoven fabric for a liquid-impregnated skin application sheet according to aspect 9 or 10, wherein the entangling step comprises a hydroentangling treatment.
(Aspect 12)
The method for producing a nonwoven fabric for a liquid-impregnated skin-covering sheet according to any one of Aspects 9 to 11, wherein the bonding step includes a hot air processing treatment.
(Aspect 13)
13. The method for producing a nonwoven fabric for a liquid-impregnated skin application sheet according to any one of aspects 9 to 12, further comprising a cooling step between the adhering step and the entangling step.
(Aspect 14)
A lamination step is included in which, after the bonding step, another fiber web containing 50% by mass or more of cellulosic fibers is laminated on the fiber web to obtain a laminated web having a basis weight of 15 g/ ^m2 or more and 70 g/ ^m2 or less,
After the lamination step, the laminated web is subjected to the entangling step.
The method for producing the nonwoven fabric according to any one of claims 9 to 13.
(Aspect 15)
15. The method of claim 14, wherein the fibrous web subjected to the bonding step consists solely of the adhesive fibers, and the other fibrous web laminated to the fibrous web consists solely of the cellulosic fibers.

The nonwoven fabric of the present disclosure contains 20% by mass or more of adhesive fibers, and the fibers are bonded and entangled with each other, so that the nonwoven fabric has excellent liquid retention capacity, good texture, a soft feel, and a relatively high strength required to stretch the nonwoven fabric at a low elongation. Therefore, the nonwoven fabric of the present disclosure is useful as a substrate for a sheet that covers the skin while impregnated with liquid, such as a face mask.

Claims (8)

A nonwoven fabric for a liquid-impregnated skin covering sheet, comprising 20% by mass or more of adhesive fibers,
In the nonwoven fabric, the fibers are bonded to each other and entangled with each other,
The basis weight is 15 g/ ^m2 or more and 40 g/ ^m2 or less,
The breaking elongation (DRY) in the CD direction is 80% or more,
The water retention rate is 900% or more.
Nonwoven fabric for liquid-impregnated skin covering sheets. A nonwoven fabric for a liquid-impregnated skin covering sheet, comprising 20% by mass or more of adhesive fibers,
In the nonwoven fabric, the fibers are bonded to each other and entangled with each other,
The basis weight is more than 40 g/ ^m2 and 70 g/ ^m2 or less,
The breaking elongation (DRY) in the CD direction is 80% or more,
The bending resistance (DRY)/thickness (load of 1.96 kPa) is 56.0 or more and 100 or less;
Nonwoven fabric for liquid-impregnated skin covering sheets. The liquid-impregnated skin application sheet according to claim 1 or 2, wherein the stress at 10% elongation in the CD direction (DRY) is 0.23 N/5 cm or more and 1.00 N/5 cm or less. The nonwoven fabric for liquid-impregnated skin application sheets according to any one of claims 1 to 3, wherein the adhesive fibers are fibers derived from splittable composite fibers. The nonwoven fabric for liquid-impregnated skin covering sheets according to any one of claims 1 to 4, which contains cellulosic fibers. A liquid-impregnated skin covering sheet obtained by impregnating the nonwoven fabric for a liquid-impregnated skin covering sheet according to any one of claims 1 to 5 with a liquid. A liquid-impregnated skin application sheet, in which the liquid is impregnated in a ratio of 100 parts by mass to 2000 parts by mass per 100 parts by mass of the nonwoven fabric for liquid-impregnated skin application sheets according to any one of claims 1 to 6. The liquid-impregnated skin covering sheet according to claim 7, which is a face mask.