Nonwoven fabric for liquid-impregnated skin covering sheet and method for producing the same, liquid-impregnated skin covering sheet, and face mask

Abstract

To provide a nonwoven fabric for a liquid-impregnated skin application sheet, which has excellent liquid retention capacity, good texture, soft touch, and relatively high strength required for stretching the nonwoven fabric at a low elongation. The nonwoven fabric for a liquid-impregnated skin covering sheet contains 50% by mass or more of adhesive fibers, and the fibers in the nonwoven fabric are bonded to each other and entangled with each other, and the fabric has a basis weight of 15 g / m. 2 More than 70g / m 2 The breaking elongation in the CD direction (DRY) is 80% or more, and the basis weight is 15 g / m 2 More than 40g / m 2 When the water retention rate is 900% or more, the weight is 40g / m 2 Over 70g / m 2 When the above condition is satisfied, the bending resistance (DRY) / thickness (1.96 kPa load) is 56.0 or more and 100 or less.

Description

[Technical Field]

[0001] The present disclosure relates to a nonwoven fabric that serves as the substrate for a liquid-impregnated skin application sheet that is impregnated with a liquid, particularly a cosmetic, a method for producing the same, a liquid-impregnated skin application sheet using the nonwoven fabric, and a face mask using the liquid-impregnated skin application sheet. [Background technology]

[0002] Various liquid-impregnated sheets have been proposed and put into practical use to cover the skin of humans or animals and deliver a predetermined substance to the skin. Specific examples include liquid-impregnated skin application sheets (such as face masks and exfoliating sheets for use on heels, elbows, knees, etc.) impregnated with a liquid containing an active ingredient (e.g., a cosmetic). Nonwoven fabrics are generally used as the substrate for liquid-impregnated skin application sheets. Because liquid-impregnated skin application sheets are often used in close contact with the skin for a relatively long period of time, various nonwoven fabrics have been proposed as the substrate in terms of adhesion, liquid release, tactile feel, convenience, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2009 / 148048 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-109053 [Patent Document 3] Japanese Patent Application Laid-Open No. 2018-141250 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a nonwoven fabric for a liquid-impregnated skin application sheet, which has excellent liquid retention capacity, good texture, a soft feel, and a relatively high strength required to elongate the nonwoven fabric at a low elongation.In another aspect, an object of the present disclosure is to provide a liquid-impregnated skin application sheet, particularly a face mask, in which the nonwoven fabric is impregnated with a liquid. [Means for solving the problem]

[0005] The present disclosure provides, in a first aspect, A nonwoven fabric for a liquid-impregnated skin dressing sheet containing 20% ​​by mass or more of adhesive fibers, In the nonwoven fabric, the fibers are bonded to each other and entangled with each other, Weight is 15g / m 2 More than 40g / m 2 is as follows: The breaking elongation in the CD direction (DRY) is 80% or more, Water retention rate is over 900%. Provided is a nonwoven fabric for a liquid-impregnated skin covering sheet.

[0006] In a second aspect, the present disclosure provides: A nonwoven fabric for a liquid-impregnated skin dressing sheet containing 20% ​​by mass or more of adhesive fibers, In the nonwoven fabric, the fibers are bonded to each other and entangled with each other, Weight is 40g / m 2 Over 70g / m 2 is as follows: The breaking elongation in the CD direction (DRY) is 80% or more, The bending resistance (DRY) / thickness (1.96 kPa load) is 56.0 or more and 100 or less. Provided is a nonwoven fabric for a liquid-impregnated skin covering sheet.

[0007] In a third aspect, the present disclosure provides a liquid-impregnated skin application sheet obtained by impregnating the nonwoven fabric for a liquid-impregnated skin application sheet according to the first or second aspect with a liquid. [Effects of the Invention]

[0008] The nonwoven fabric for a liquid-impregnated skin dressing sheet (hereinafter referred to as "nonwoven fabric") of the present disclosure integrates fibers through both bonding and entanglement, and therefore has a relatively high strength required for elongation at low elongation, resulting in excellent handleability. Furthermore, the nonwoven fabric of the present disclosure is relatively bulky, and therefore has excellent liquid retention capacity and exhibits relatively high adhesion, thereby reducing or eliminating areas of the nonwoven fabric that "float" above the skin, allowing liquid to be distributed over the entire skin at a predetermined site for a relatively long period of time. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Background to this disclosure) Liquid-impregnated skin dressing sheets are generally stored in a folded state in a liquid-impermeable packaging container. The user removes the sheet from the container, unfolds it, and applies it to the desired area. During this series of actions during use, a stretching force is applied to the sheet. If the sheet is easily stretched with even a small force, i.e., if the stretching stress (or stretching modulus) is small, the sheet may stretch and deform. For example, if the sheet is a face mask, sheet deformation can cause the openings provided for the eyes and mouth to be positioned incorrectly. Furthermore, if a nonwoven fabric stretches with even a small force, the processability of the nonwoven fabric may be reduced, making the liquid impregnation process, the formation of openings, and cutting into a desired shape difficult.

[0010] Therefore, the inventors have investigated various nonwoven fabric configurations to improve the stress when the nonwoven fabric is stretched by about 10%. Nonwoven fabrics for liquid-impregnated skin dressing sheets include hydroentangled nonwoven fabrics in which fibers are integrated by a hydroentanglement process, 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.

[0011] Hydroentangled nonwoven fabrics are made by entangling fibers together, and therefore are more flexible and have a softer feel than bonded nonwoven fabrics. However, they tend to be less processable and easier to handle because they tend to stretch easily, i.e., have a smaller elongation stress. This tendency becomes more pronounced as the basis weight of the nonwoven fabric decreases.

[0012] In bonded nonwoven fabrics, the fibers are bonded relatively strongly to one another, so the stress at low elongation tends to be higher than that of hydroentangled nonwoven fabrics. However, in bonded nonwoven fabrics, the bonded areas of the fibers tend to make the nonwoven fabric feel harder to the touch, increasing its roughness and stiffness, and the fabric tends to have poorer flexibility. 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 deterioration in the feel of the nonwoven fabric due to bonding.

[0013] 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 softness of a hydroentangled nonwoven fabric, and have found that a production method in which a fiber web containing adhesive fibers is first subjected to a bonding treatment and then to an entanglement treatment can produce a nonwoven fabric that is soft and has a good touch while moderately improving the stress at extension, as the bonded portions are partially destroyed in the subsequent entanglement treatment, thereby reducing the rough and hard feel. The nonwoven fabric of the present disclosure, its manufacturing method, and a liquid-impregnated skin application sheet using the same will be described below.

[0014] [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 dressing 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, Weight is 15g / m 2 More than 40g / m 2 is as follows: The breaking elongation in the CD direction (DRY) is 80% or more, Water retention rate is over 900%. This is a nonwoven fabric for liquid-impregnated skin covering sheets.

[0015] Alternatively, another example of the nonwoven fabric according to the first embodiment of the present disclosure is a nonwoven fabric for a liquid-impregnated skin dressing 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, Weight is 40g / m 2 Over 70g / m 2 is as follows: The breaking elongation in the CD direction (DRY) is 80% or more, The bending resistance (DRY) / thickness (1.96 kPa load) is 56.0 or more and 100 or less. This is a nonwoven fabric for liquid-impregnated skin covering sheets.

[0016] The nonwoven fabric of this embodiment contains adhesive fibers, and the fibers are bonded and entangled with each other, and has a CD breaking elongation (DRY) of 80% or more, a water retention of 900% or more when the basis weight is relatively small, and a bending resistance (DRY) / thickness (1.96 kPa load) of 56.0 or more and 100 or less when the basis weight is relatively large. The fibers that make up the nonwoven fabric of this embodiment will be described below first.

[0017] (adhesive fiber) The term "adhesive fiber" refers to a fiber that exhibits adhesiveness through a bonding process (e.g., thermal bonding process, electron beam irradiation, ultrasonic welding (ultrasonic welder), etc.) and can bond fibers together to form bonded areas, and is not particularly limited as long as the nonwoven fabric intended by the present disclosure can be obtained.

[0018] The adhesive fibers include, for example, synthetic fibers made of thermoplastic resin. Thermoplastic resins are not particularly limited and include, for example, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate, and copolymers thereof; polyolefin resins such as polypropylene, polyethylene (including high-density polyethylene, low-density polyethylene, and linear low-density polyethylene), polybutene-1, propylene copolymers primarily composed of propylene (including propylene-ethylene copolymers and propylene-butene-1-ethylene copolymers), ethylene-acrylic acid copolymers, and ethylene-vinyl acetate copolymers; polyamide 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. Synthetic fibers may be produced using one or more thermoplastic resins selected from these.

[0019] The synthetic fiber may be a single fiber made of one or more thermoplastic resins selected from the above, or may be a bicomponent fiber made of two or more components (also called "sections"). In the bicomponent fiber, each component may be made of a single thermoplastic resin, or may be a mixture of two or more thermoplastic resins. The bicomponent fiber may be, for example, a sheath-core bicomponent fiber, an islands-in-the-sea bicomponent fiber, or a side-by-side bicomponent fiber. The sheath-core bicomponent fiber may be an eccentric sheath-core bicomponent fiber in which the center of the core component and the center of the sheath component do not coincide in the fiber cross section, or a concentric sheath-core bicomponent fiber in which the center of the core component and the center of the sheath component coincide in the fiber cross section. The bicomponent fiber may also be a splittable bicomponent fiber.

[0020] 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 fiber has a non-circular cross section, the cross section may be elliptical, polygonal, star-shaped, or a shape in which multiple projections are joined at their bases (for example, cloverleaf shape). In this embodiment, two or more synthetic fibers may be used in combination as the synthetic fibers.

[0021] 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 forms part of the fiber surface. The thermoplastic resin with a low melting point (low-melting component) melts or softens when heat is applied during the process of producing a nonwoven fabric, becoming an adhesive component. The low-melting component contributes to the adhesion of fibers to each other or to other components, 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, particularly 50% or more, more particularly 60% or more, and even more particularly 80% or more. Alternatively, the low-melting point component may be exposed over the entire circumferential length of the fiber.

[0022] 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 adhesion between the fibers is resolved in the entanglement step. 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.

[0023] When the synthetic fiber is a core-sheath type composite fiber, the core-to-sheath composite ratio (volume ratio, core / sheath) may be, for example, 80 / 20 to 20 / 80, and particularly 60 / 40 to 40 / 60. When the core / sheath composite ratio is within this range, the fibers are bonded appropriately. Furthermore, when a nonwoven fabric is produced by performing an entanglement step after the bonding step, excessive peeling at the bonded portions during the entanglement step does not occur. Furthermore, when the core / sheath composite ratio is within this range, the core component easily maintains the fiber shape, and the strength of the nonwoven fabric can be favorably achieved.

[0024] Alternatively, the synthetic fiber may be a fiber derived from a splittable conjugate fiber. "Fiber derived from a splittable conjugate fiber" refers to a single fiber formed by splitting a splittable conjugate fiber, consisting of only one section before splitting, a fiber consisting of two or more sections, as well as a fiber in which a portion of a splittable conjugate fiber has been split but the other portion has not been split at all. Alternatively, to the extent that a nonwoven fabric contains fibers formed by splitting a splittable conjugate fiber, if there is a case in which a single splittable conjugate fiber has not been split at all, such a splittable conjugate fiber that has not been split at all is also included in the category of fibers derived from splittable conjugate fibers.

[0025] Specifically, splittable conjugate fibers have a cross-sectional structure in which at least one of the constituent components is divided into two or more parts in the fiber cross section, at least a portion of the constituent components is exposed on the fiber surface, and the exposed parts are formed continuously in the length direction of the fiber. Splittable conjugate fibers may have wedge-shaped sections arranged in a chrysanthemum shape. Alternatively, splittable conjugate fibers may have sections arranged in layers in the fiber cross section. Furthermore, splittable conjugate fibers may be so-called solid splittable conjugate fibers, which do not have continuous cavities in the length direction when the fiber cross section is observed, or so-called hollow splittable conjugate fibers, which have one or more continuous cavities in the length direction.

[0026] 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.

[0027] The adhesive component of the adhesive fiber (or the low-melting component in the case of bicomponent fibers) may be a copolymer of an olefin and an unsaturated carboxylic acid or its derivative. Such copolymers exhibit good adhesion to cellulosic fibers. Examples of unsaturated carboxylic acids include maleic acid, acrylic acid, methacrylic acid, fumaric acid, and itaconic acid. Examples of their derivatives include anhydrides of unsaturated carboxylic acids, methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate, and dimethylaminoethyl methacrylate, as well as similar acrylic acid esters, glycidyl acrylate, glycidyl methacrylate, butenecarboxylic acid esters, allyl glycidyl ether, 3,4-epoxybutene, 5,6-epoxy-1-hexene, and vinylcyclohexene monoxide. 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 is particularly preferred.

[0028] Combinations of thermoplastic resins that make up the composite fiber include, for example, combinations of polyolefin resins and polyester resins (polyolefin resin / polyester resin), such as polyethylene / polyethylene terephthalate, polypropylene / polyethylene terephthalate, and propylene copolymer / polyethylene terephthalate, 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.

[0029] When the synthetic fiber is a sheath-core composite fiber in which a thermoplastic resin with a lower melting point constitutes the sheath portion, examples of core / sheath combinations include polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, polyethylene terephthalate / propylene copolymer, polytrimethylene terephthalate / polyethylene, polybutylene terephthalate / polyethylene, polyethylene terephthalate / copolymer polyester (e.g., 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 sheath-core composite fibers. Sheath-core composite fibers in which the sheath is polyethylene (e.g., high-density polyethylene, low-density polyethylene, or linear low-density polyethylene) or a copolymer polyester have the property that, when heat-treated at a temperature above the melting point of the thermoplastic resin constituting the sheath, the sheath melts or softens, bonding the fibers together and forming bonded areas.

[0030] When the synthetic fiber is derived from a splittable conjugate fiber, examples of the resin combinations constituting each section of the splittable conjugate fiber include those exemplified as the core / sheath combinations for the core-sheath conjugate fiber described above. In particular, examples of resin combinations constituting splittable conjugate fibers include polyethylene terephthalate / polyethylene, polyethylene terephthalate / ethylene-propylene copolymer, polypropylene / polyethylene, and polylactic acid / polybutylene succinate (wherein the 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 conjugate fiber also affects splitting, and generally, a combination of polymers of different systems (such as polyolefin, polyester, or polyamide systems) produces a splittable conjugate fiber that is easier to split.

[0031] The thermoplastic resins exemplified as constituent 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 specified thermoplastic resin. For example, in the combination of polyethylene / polyethylene terephthalate, the "polyethylene" may contain other thermoplastic resins and additives, etc., as long as it contains 50% by mass or more of polyethylene. This also applies to the examples below.

[0032] Two or more adhesive fibers may be included. 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, particularly 15°C or more and 30°C or less.

[0033] The fineness of the adhesive fiber may be, for example, 1.0 dtex to 7.8 dtex, particularly 1.4 dtex to 6.7 dtex, and more particularly 2.2 dtex to 4.5 dtex. When the fineness of the adhesive fiber is within the above range, the resulting nonwoven fabric tends to have an appropriate strength and a soft feel.

[0034] In particular, the fineness of the splittable conjugate 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 contained as fibers derived from the splittable conjugate fiber, the nonwoven fabric becomes flexible, and the fine voids formed between the ultrafine fibers allow the liquid to be well retained.

[0035] To produce such ultrafine fibers, the fineness of the splittable conjugate 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. The lower limit of the fineness of the ultrafine fibers is not particularly limited, but is preferably 0.05 dtex or more.

[0036] 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, it is easy to achieve a nonwoven fabric with appropriate strength and soft feel.

[0037] The fiber length of the adhesive fiber may be, for example, 25 mm to 100 mm, particularly 30 mm to 70 mm, and more particularly 35 mm to 60 mm. When the fiber length of the adhesive fiber is within the above range, the entanglement of the fibers tends 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 bonded points to be formed on each fiber in the bonding step.

[0038] The adhesive fibers are contained in the nonwoven fabric of this embodiment in an amount of 20% by mass or more. By setting the proportion of adhesive fibers to 20% by mass or more, the number of bonded locations in the nonwoven fabric can be made appropriate, thereby improving the stress during elongation of the resulting nonwoven fabric at low elongation rates (particularly 10%). 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 solely of adhesive fibers. Furthermore, the nonwoven fabric may be composed solely of fibers derived from splittable conjugate fibers. Fibers derived from splittable conjugate fibers contain ultrafine fibers, which tend to reduce the area of ​​bonded locations. Therefore, even if the nonwoven fabric is composed solely of fibers derived from splittable conjugate fibers, the nonwoven fabric is less likely to feel stiff.

[0039] (cellulosic fiber) The nonwoven fabric of this embodiment may contain fibers other than adhesive fibers, for example, cellulosic fibers. Cellulosic fibers are generally hydrophilic, and when contained in a nonwoven fabric, they serve to improve the liquid retention of the nonwoven fabric. Therefore, the following description will focus on cellulosic fibers.

[0040] "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-based rayon and polynosic rayon, cupra obtained by the cuprammonium method, and Tencel® and Lyocell® obtained by solvent spinning; (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.

[0041] The fineness of the cellulosic fibers may be, for example, 0.6 dtex to 5.6 dtex, particularly 1.0 dtex to 4.4 dtex, and more particularly 1.4 dtex to 3.3 dtex. When the fineness of the cellulosic fibers 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. If the fineness is too small, the strength of the nonwoven fabric may be low. If the fineness is too large, the texture of the nonwoven fabric may be reduced. The fineness of the cellulosic fibers also affects the entanglement of the fibers when producing a nonwoven fabric by the method described below (especially a method in which the entanglement treatment includes hydroentanglement). When the fineness of the cellulosic fibers is within the above-mentioned range, the degree of entanglement is made appropriate. If the degree of entanglement is too high, the bulkiness of the nonwoven fabric may be reduced, which may result in a poor feel or a poor liquid retention ability. If the degree of entanglement is too low, the stress at elongation may be low.

[0042] 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 cellulosic fiber is within the above-mentioned range, the strength of the nonwoven fabric can be made appropriate, and the texture of the nonwoven fabric will also be good. If the fiber diameter is too small, the strength of the nonwoven fabric may be low. If the fiber diameter is too large, the texture of the nonwoven fabric may be reduced. The fiber diameter of the cellulosic fiber also affects the entanglement of the fibers. When the fiber diameter of the cellulosic fiber is within the above-mentioned range, the degree of entanglement will be appropriate when producing a nonwoven fabric by the method described below (especially a method in which the entanglement treatment includes hydroentanglement). If the degree of entanglement is too high, the bulkiness of the nonwoven fabric may be reduced, and if the degree of entanglement is too low, the stress at elongation may be low.

[0043] The fiber length of the cellulosic fibers may be, for example, 25 to 100 mm, particularly 30 to 70 mm, and more particularly 35 to 60 mm. When the fiber length of the cellulosic fibers is within the above range, the entanglement of the fibers tends to be favorable when a nonwoven fabric is produced by the method described below (particularly a method in which the entanglement treatment includes a hydroentanglement treatment). In particular, in the production method of this embodiment, when the fiber length is within the above range, a more appropriate number of bonded points can be formed on each fiber in the bonding step.

[0044] The cross section of the cellulosic fiber (transverse cross section, or cross section perpendicular to the length direction of the fiber) may be circular or noncircular. Examples of noncircular shapes include oval, Y-shaped, X-shaped, square, multi-lobed, polygonal, star-shaped, and chrysanthemum-shaped. 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.

[0045] As the cellulosic fibers, chemical fibers such as regenerated fibers or semi-synthetic fibers may be used. The variations in fineness and / or fiber diameter, as well as fiber length, of chemical fibers are smaller than those of natural fibers, making it easier to adjust the degree of entanglement of the nonwoven fabric. Furthermore, regenerated fibers such as rayon and solvent-spun cellulose fibers have a good balance of softness and strength when wet, making it easier to achieve the softness and strength suitable for the texture of a nonwoven fabric, and are therefore preferred. Furthermore, solvent-spun cellulose fibers are preferred because they have relatively high single fiber strength, which leads to better strength in the nonwoven fabric. The cellulosic fibers can be used alone or in combination.

[0046] 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 using, for example, values ​​such as the sedimentation rate of the fibers. The surface treatment may be to increase the hydrophilicity of the surface (hydrophilization treatment) or to decrease the hydrophilicity of the surface (hydrophobization treatment).

[0047] 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.

[0048] The settling velocity of the fibers can be measured by the following method. 17 g of fiber is collected to measure the sedimentation rate. 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, 5 cm diameter, 8 cm height, 3 g mass) made of copper wire (0.55 mm diameter). Next, prepare a thermostatic water bath, fill it with tap water, and set it to 25°C. Once the water temperature reaches 25°C, stop stirring the thermostatic water bath and begin measuring the sedimentation rate. Gently drop the basket filled with fibers using the procedure 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 stop the stopwatch as soon as the 8 cm high basket completely sinks below the water surface. The sedimentation rate is the time from when the basket hits the water surface to when it sinks below the water surface, and the average of the two measurements is taken as the sedimentation rate of that fiber.

[0049] (other fibers) The nonwoven fabric of this embodiment may contain fibers other than cellulosic fibers and adhesive fibers (hereinafter referred to as "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.

[0050] 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.

[0051] (Nonwoven fabric composition) An example of the nonwoven fabric of this embodiment contains 20 mass % or more of adhesive fibers as described above, the fibers are bonded to each other and are entangled with each other, and has a basis weight of 15 g / m 2 More than 40g / m 2 The nonwoven fabric has a breaking elongation (DRY) in the CD direction of 80% or more and a water retention rate of 900% or more.

[0052] Another example of the nonwoven fabric of this embodiment is a nonwoven fabric containing 20 mass % or more of adhesive fibers as described above, in which the fibers are bonded to each other and entangled with each other, and has a basis weight of 40 g / m 2 Over 70g / m 2The nonwoven fabric has a breaking elongation (DRY) in the CD direction of 80% or more, and a bending resistance (DRY) / thickness (1.96 kPa load) ratio of 56.0 to 100.

[0053] The fibers are bonded together by adhesive fibers. At the bonded locations where the fibers are bonded together, the components of the adhesive fibers melt or soften and then solidify again to form bonded areas. The fibers may be entangled by, for example, a hydroentanglement treatment, as described below.

[0054] The nonwoven fabric of this embodiment is made by integrating fibers through bonding and entanglement, and therefore combines the features of both processes. When produced by the method described below, the entanglement process is carried out after the bonding process, so that the bonded portions are no longer bonded. Therefore, compared to nonwoven fabrics produced by carrying out the bonding process after the entanglement process, the nonwoven fabric is softer and tends to have more interfiber voids.

[0055] More specifically, the nonwoven fabric of this embodiment ensures its mechanical strength through bonding and entanglement, and therefore can achieve a relatively high breaking elongation in the CD (cross direction) and a softer texture than a nonwoven fabric that ensures mechanical strength through bonding alone. On the other hand, the nonwoven fabric of this embodiment, in which the fibers are fixed to one another to a certain extent by bonding, has a higher resistance to elongation and exhibits a relatively large stress at 10% elongation than a nonwoven fabric that is integrated only by entanglement of the fibers.

[0056] The nonwoven fabric of this embodiment has a basis weight of 15 g / m 2 More than 70g / m 2 When the elongation at break (DRY) is less than 80%, the nonwoven fabric has a breaking elongation (DRY) of 80% or more in the CD direction. Here, "DRY" indicates that the measurement is performed without the nonwoven fabric being impregnated with liquid. The breaking elongation (DRY) in the CD direction may particularly be 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.

[0057] The basis weight of the nonwoven fabric of this embodiment is particularly 20 g / m 2 More than 60g / m 2 or less, more particularly 30 g / m 2 More than 50g / m 2 It may be the following:

[0058] 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 MD breaking elongation (DRY) can also characterize the nonwoven fabric of this embodiment.

[0059] For example, when the nonwoven fabric of this embodiment contains fibers derived from splittable conjugate fibers as adhesive fibers, the higher the degree of splitting of the splittable conjugate fibers (i.e., the higher the split ratio), the lower the MD breaking elongation (DRY) of the nonwoven fabric. When a nonwoven fabric is produced by the method described below, the entanglement step can be carried out with the fibers fixed to a certain extent by the bonding step, and the strength of the nonwoven fabric can be ensured to a certain extent by the bonding, so there is no need to increase the degree of entanglement of the nonwoven fabric. Therefore, splitting of the splittable conjugate 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 stiff. Therefore, by setting the MD breaking elongation (DRY) in the above range, combined with a CD breaking elongation (DRY) of 80% or more, a soft nonwoven fabric can be obtained.

[0060] As described above, the nonwoven fabric of this embodiment tends to have more interfiber voids and be bulkier than nonwoven fabrics produced by carrying out the bonding step after the entangling step, 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, the nonwoven fabric of this embodiment exhibits a high water retention rate when the basis weight is 15 g / m 2 More than 40g / m 2 When the water retention is measured by the method described in the Examples below, the nonwoven fabric exhibits a water retention of 900% or more when the water retention is below 900%. In this embodiment, the water retention of a nonwoven fabric having a relatively low basis weight may particularly be 1000% or more, more particularly 1200% or more.

[0061] The nonwoven fabric of this embodiment has a relatively high basis weight, for example, a basis weight of 40 g / m 2 Over 70g / m 2 When the water retention is measured by the method described in the Examples below, the water retention is, for example, 700% or more. In this embodiment, the water retention of a 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. Regardless of the basis weight, 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.

[0062] 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, the nonwoven fabric of this embodiment has a basis weight of 40 g / m 2 Over 70g / m 2 When the thickness and bending resistance (DRY) of the nonwoven fabric are measured by the methods described in the Examples below and the bending resistance (DRY) / thickness (1.96 kPa load) is calculated from the measured values, the value is 56.0 or more and 100 or less. In the nonwoven fabric of this embodiment, the value of bending resistance (DRY) / thickness (1.96 kPa load) may particularly be 60 or more, and more particularly may be 70 or more. The upper limit of bending resistance (DRY) / thickness (1.96 kPa load) may be, for example, 98.0.

[0063] Alternatively, when the nonwoven fabric of this embodiment has a relatively small basis weight, for example, when the basis weight is 15 g / m 2 More than 40g / m 2 When the nonwoven fabric has a bending resistance (DRY) / thickness (1.96 kPa load) of 10.0 or more and 65.0 or less, the bending resistance (DRY) / thickness (1.96 kPa load) of the 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.

[0064] Because stiffness is affected by the thickness of the nonwoven fabric, stiffness (DRY) / thickness (1.96 kPa load) is an index of the softness of the nonwoven fabric excluding the influence of the thickness of the nonwoven fabric. Therefore, the smaller this value, the softer the nonwoven fabric is, and when used as a face mask, for example, it will conform well to the skin. The larger this value, the stiffer the nonwoven fabric is, and when used as a face mask, for example, it will tend to adhere less well to the skin.

[0065] The nonwoven fabric of this embodiment also exhibits a relatively high stress at 10% elongation. Specifically, the nonwoven fabric of this embodiment has a basis weight of 15 g / m 2 More than 70g / m 2 When the stress at 10% elongation (DRY) in the CD direction is less than or equal to 0.23 N / 5 cm, the stress at 10% elongation (DRY) 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, for example, a core-sheath type composite fiber rather than a fiber derived from a splittable composite fiber.

[0066] When the nonwoven fabric of this embodiment contains adhesive fibers and cellulosic fibers, it has a density of, for example, 0.01 to 0.20 g / cm 3 when dry. 3 and may have a fiber density of 0.02 to 0.15 g / cm 3 It is preferable that the fiber density is 0.03 to 0.14 g / cm 3 It is more preferable that the fiber density of the entire nonwoven fabric is 1.96 kPa. The fiber density of the entire nonwoven fabric can be determined from the basis weight and thickness (thickness measured by applying a load of 1.96 kPa).

[0067] When the nonwoven fabric of this embodiment is made of adhesive fibers only, it has a density of, for example, 0.01 to 0.20 g / cm 3 when dry. 3 and may have a fiber density of 0.02 to 0.15 g / cm 3 It is preferable that the fiber density is 0.03 to 0.10 g / cm 3 It is more preferable that the fiber density of the entire nonwoven fabric is 1.96 kPa. The fiber density of the entire nonwoven fabric can be determined from the basis weight and thickness (thickness measured by applying a load of 1.96 kPa).

[0068] [Embodiment 2] (Nonwoven fabric manufacturing method) 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 to be subjected to the entanglement step has a basis weight of 15 g / m 2 More than 70g / m 2 is as follows: The step of winding the fibrous web into a roll is not included between the bonding step and the entangling step. This is a method for producing a nonwoven fabric for a liquid-impregnated skin covering sheet, which has a breaking elongation in the CD direction (DRY) of 80% or more.

[0069] 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 carded web such as a semi-random web or a random web, an air-laid web, or a wet-laid web. A parallel web form of the fiber web is preferred because it makes the surface of the nonwoven fabric smoother.

[0070] The preparation of the fibrous webs may include, for example, separately preparing fibrous web A and fibrous web B. In this case, as described below, for example, fibrous web A may be subjected to a bonding step, and then fibrous web B may be laminated thereon, and the laminated two fibrous webs may be subjected to an entanglement step. When a nonwoven fabric is produced by such a method, fibrous web A and fibrous web B may be identical. Alternatively, when two or more types of fibers are used, fibrous web A and fibrous web B may differ from each other in at least one of the blend ratio, shape, and basis weight. For example, fibrous web A may be composed only of adhesive fibers, and fibrous web B may be composed only of cellulosic fibers, without adhesive fibers. In this case, if the entanglement step includes a hydroentanglement treatment, the fibers of fibrous web B will be more effectively entangled with the fibers of fibrous web A. Preparing the fibrous web may include separately preparing three or more fibrous webs on three or more web manufacturing lines.

[0071] The basis weight of the fiber web is selected according to the basis weight of the nonwoven fabric to be obtained. For example, if a fiber web lamination step is not included after the bonding step and before the entanglement step, the basis weight of the fiber web will be the same as the basis weight of the fiber web to be obtained. If a 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 so that the ratio of adhesive fiber to other fiber to the total fiber contained in each fiber web is the desired ratio. For example, if fiber web A is composed only of adhesive fiber and fiber web B is composed only of other fiber, the basis weight ratio of fiber web A to fiber web B will be the mixture ratio of adhesive fiber to other fiber, and the basis weight is selected taking this into consideration.

[0072] For example, when fiber web A is made of adhesive fibers only and fiber web B is made of cellulosic fibers only, the basis weight of fiber web A is 8 g / m 2 More than 35g / m 2 The fiber web B may have a basis weight of 7 g / m or less. 2 More than 35g / m 2 In particular, the basis weight of the fiber web A may be 10 g / m or less.2 More than 30g / m 2 The fiber web B may have a basis weight of 10 g / m or less. 2 More than 30g / m 2 If the basis weight of the fibrous web A is too small, the soft feel of the nonwoven fabric may decrease, and if the basis weight of the fibrous web B is too small, the water retention rate of the nonwoven fabric may decrease.

[0073] (Adhesion process) Next, the bonding process will be described. The bonding step is a step in which fibers are bonded together by adhesive fibers contained in the fiber web to form bonded portions.

[0074] The bonding step may be, for example, a thermal bonding step, which is a step of forming bonded portions by heat-treating the fiber web to melt or soften the component (thermal bonding component) with the lowest melting point among the resin components constituting the adhesive fibers, thereby bonding the fibers constituting the fiber web together.

[0075] The heat treatment may be, for example, a hot air processing treatment in which hot air is blown, a heat roll processing (e.g., a hot embossing roll processing), or a treatment using infrared rays. Hot air processing is preferred to make the resulting nonwoven fabric bulky. Hot air processing may be carried out using a device that blows hot air at a predetermined temperature onto the fiber web, such as a hot air penetration type heat treatment machine or 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.

[0076] When the bonding step is a hot air 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 adhesive strength between the cellulosic fiber and the adhesive fiber is not higher than the adhesive strength between adhesive fibers, blowing hot air multiple times is effective in further enhancing the adhesive strength between the cellulosic fiber and the adhesive fiber.

[0077] When the bonding step is a hot air treatment, the hot air speed 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, from the viewpoint of ensuring 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 entire fiber web, and if it is too high, the bulkiness may be impaired.

[0078] The heat treatment temperature may be the temperature at which the component with the lowest melting point (thermal adhesive component) among the resin components constituting the adhesive fiber softens or melts, for example, a temperature equal to or higher than the melting point of that 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 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. Furthermore, 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 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.

[0079] The bonding step may be performed by irradiation with an electron beam or the like, or ultrasonic welding. These bonding processes also allow the resin component constituting the adhesive fiber to bond the fibers together.

[0080] For example, if the fiber web after the bonding step has a MD breaking strength (DRY) of 1.0 N / 5 cm or more, it is likely to produce a nonwoven fabric with sufficient bonding. The MD breaking strength (DRY) 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 step may have a stiffness (DRY) of 100 g or less, measured by the method described in the Examples. In this case, it is easy to finally obtain a nonwoven fabric with a soft texture. The stiffness (DRY) may be particularly 80 g or less, more particularly 60 g or less.

[0081] (cooling process) The fibrous web subjected to the bonding step may be subjected to a cooling step before being subjected to the entangling step. If the fibrous web after the bonding step is subjected to the subsequent entangling step while some of the adhesive fibers are softened or melted, excessive peeling may occur at the bonded portions, resulting in a decrease in the strength of the nonwoven fabric or an increased likelihood of resin fragments being generated. Therefore, in the cooling step, the fibrous web may be cooled until the adhesive component is solidified. The cooling step may be natural cooling (cooling naturally) 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 fibrous web on a belt or between rolls until the fibrous web after the bonding step is sufficiently cooled.

[0082] (confounding 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 facilitates entanglement of the fibers and allows the resulting nonwoven fabric to have a higher bulk.

[0083] 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 production 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. Below, an entanglement process when high-pressure water (hereinafter also simply referred to as "water flow") is used as the high-pressure fluid will be described.

[0084] The hydroentanglement treatment can be carried out, for example, by spraying water at a pressure of 1 MPa to 15 MPa from a nozzle having orifices with a hole diameter of 0.05 mm to 0.5 mm arranged at intervals of 0.3 mm to 1.5 mm onto each of the front and back surfaces of the fibrous 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.

[0085] 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 surface of the nonwoven fabric is flat and has no irregularities, the support should have an open pore area of ​​0.2 mm 2 It is preferable to use a support that does not have openings exceeding 100 mesh and that does not have protrusions or patterns formed thereon. For example, it is preferable to use a plain woven support having a mesh size 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.

[0086] When the bonding step is a hot air processing treatment, it is preferable that the hydroentanglement treatment first sprays a columnar water stream onto the surface onto which hot air was blown in the hot air processing treatment (hereinafter referred to as the "hot air blown surface"), and then sprays a columnar water stream onto 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 treatment), and entanglement by the columnar water stream is more likely to proceed. The strength of the nonwoven fabric obtained by the hydroentanglement 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 fibrous web where the fiber density is relatively low, and where entanglement is more likely to proceed.

[0087] For example, when fiber web A and fiber web B are prepared separately, fiber web A is subjected to a bonding step, fiber web B is laminated on top of it, and the laminated web is subjected to a hydroentanglement treatment in the entanglement step, it is preferable to spray the columnar water stream first from the hot air blowing surface side of fiber web A. 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 stream first from the fiber web B side.

[0088] During the entanglement process, the bonded portions may be destroyed due to the impact of the water jets, etc. Such destruction does not occur in nonwoven fabrics produced by carrying out the bonding process after the entanglement process, and this may characterize the production 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, thereby increasing the water retention rate of the nonwoven fabric. Furthermore, it is believed that the increased degree of freedom of the fibers can improve the adhesion of the liquid-impregnated nonwoven fabric to the skin.

[0089] [Embodiment 3] (Manufacturing method including lamination process) The manufacturing method of embodiment 3 of the present disclosure includes a lamination step in which fibrous web A and fibrous web B are prepared separately, only fibrous web A is subjected to a bonding step, and fibrous web B is laminated on fibrous web A after the bonding step to obtain a laminated web. In the manufacturing method of embodiment 3, the laminated web is subjected to an entanglement step. The fibrous web to be subjected to the entanglement step has a portion (fibrous web B) that is not bonded, and therefore, when a water stream is sprayed onto the portion, entanglement tends to proceed further. In particular, when fibrous web B contains or is composed solely of cellulosic fibers, entanglement is more likely to proceed further. Therefore, sufficient entanglement is likely to be achieved even if the water pressure of the water stream used in the entanglement step is reduced or the proportion of cellulosic fibers is reduced.

[0090] In the manufacturing method of embodiment 3, the conditions for the bonding step, entangling step, and post-entangling bonding step are the same as those described in relation to the manufacturing method of embodiment 2, and therefore will not be described here. However, the conditions for these steps are appropriately adjusted depending on the types and ratios of fibers contained in fibrous webs A and B and their basis weights.

[0091] In the manufacturing method of this embodiment, when fibrous web B consists only of adhesive fibers and fibrous web A consists only of cellulosic fibers, the resulting nonwoven fabric is a type of laminated nonwoven fabric, with one surface containing a higher proportion of adhesive fibers and the other surface containing a higher proportion of cellulosic fibers. Also, when fibrous webs A and B are produced in this manner, the resulting nonwoven fabric is a type of laminated nonwoven fabric, with one surface containing a higher proportion of adhesive fibers and the other surface containing a higher proportion of cellulosic fibers.

[0092] (Liquid-impregnated skin covering sheet) The nonwoven fabric of embodiment 1 can be impregnated with a liquid to form a liquid-impregnated skin covering sheet for covering human or animal skin. The liquid to be impregnated and the amount of impregnation can be selected appropriately depending on the intended use. When the sheet is used as a liquid-impregnated skin covering sheet for personal use, such as a face mask for personal use, an exfoliating sheet, or a décolleté sheet, the sheet may be impregnated with a liquid containing an active ingredient (e.g., a cosmetic product) in an amount of 600 to 2,500 parts by weight per 100 parts by weight of the nonwoven fabric, particularly 600 to 1,500 parts by weight, and more particularly 700 to 1,500 parts by weight per 100 parts by weight of the nonwoven fabric. Examples of active ingredients include, but are not limited to, moisturizing ingredients, exfoliating ingredients, antiperspirants, fragrance ingredients, whitening ingredients, blood circulation-promoting ingredients, UV protection ingredients, and slimming ingredients.

[0093] The face mask is provided in a shape suitable for covering the face, and further has openings or cutouts formed by punching, for example, in areas corresponding to the eyes, nose, and mouth, as needed. Alternatively, the face mask may be shaped to cover only a portion of the face (for example, 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 as a set of sheets that separately cover three or more areas.

[0094] The exfoliating sheet is a skin covering sheet used on areas such as the heels, elbows, and knees 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 promotes moisturizing and softening of the keratin, and promotes the removal of excess keratin. The nonwoven fabric of this embodiment can be used as a substrate for exfoliating sheets that exhibit either of these effects and efficacy. Exfoliating sheets, for example, exfoliating sheets for the heel, are provided in a form with slits and / or notches and / or punched-out openings in order to allow the sheet to easily conform to the curve of the heel when applied.

[0095] Alternatively, the liquid-impregnated skin dressing sheet may be used as a cleansing sheet containing a cleansing ingredient as an active ingredient. The cleansing sheet may be used, for example, by adhering it to the area (skin) from which dirt (makeup) needs to be removed, leaving it attached for a period of time to allow the cleansing ingredient to blend with the makeup, and then wiping off the makeup. Like face masks, cleansing sheets can be considered a type of liquid-impregnated skin dressing sheet for personal use. However, unlike face masks, which are used to deliver active ingredients to the skin, cleansing sheets are applied to the skin to blend with the makeup, and therefore 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.

[0096] 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 (for example, the neck, the back of the hands, or the area from the neck to the chest (also known as 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.

[0097] The liquid-impregnated skin application sheet may be provided in a state in which the nonwoven fabric substrate is folded. The nonwoven fabric may be folded only in one direction, or may be folded once or more in each of different directions. For example, a liquid-impregnated nonwoven fabric may be provided by folding it once or more in a direction parallel to the machine direction (i.e., with the folds parallel to the machine direction) and once or more in a direction parallel to the cross direction (i.e., with the folds parallel to the cross direction).

[0098] The liquid-impregnated skin application sheet of this embodiment is easy to handle because it uses a nonwoven fabric substrate with a relatively high 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 substrate and the relatively high degree of freedom in the composition of its fibers.

[0099] The liquid-impregnated skin application sheet may be provided by storing multiple sheets in one package or container. For such products, it may be desirable to store more sheets in one package or container. The nonwoven fabric of embodiment 1 has a density of 15 g / m 2 ~40g / m 2 Since it can be provided as a thin sheet having a relatively small basis weight, it meets such a demand. [Example]

[0100] The fibers used to produce the nonwoven fabrics of the Examples and Comparative Examples are shown below. Fiber 1-1 (adhesive fiber): A splittable composite fiber (volume ratio 50:50 (polyethylene terephthalate:high-density polyethylene)) with a fineness of 2.2 dtex and a fiber length of 51 mm, consisting of a combination of polyethylene terephthalate (melting point 255°C) and high-density polyethylene (melting point 130°C), with a cross section in which polyethylene terephthalate sections and high-density polyethylene sections are alternately arranged in a chrysanthemum shape, and with a total of 8 sections (product name DFS(SH), manufactured by Daiwabo Polytec Co., Ltd.). Fiber 1-2 (adhesive fiber): A concentric core-sheath composite fiber (volume ratio 37:63 (core:sheath)) with a polyethylene terephthalate core and a high-density polyethylene (melting point: approximately 133°C) sheath, having a fineness of 2.2 dtex and a fiber length of 51 mm (NBF(SH) (product name) manufactured by Daiwabo Polytech Co., Ltd.). Fiber 2 (cellulosic fiber): Viscose rayon fiber with a fineness of 1.7 dtex and a fiber length of 40 mm (Corona CD (product name) manufactured by Daiwabo Rayon Co., Ltd.).

[0101] <Production of Nonwoven Fabric of Example 1> [Adhesion process / cooling process / lamination process] Fiber 1-1 was mixed at 60% by mass and Fiber 2 at 40% by mass, and a parallel carding machine was used to achieve a target weight of 30 g / m 2 A fiber web of 1000 .mu.m was produced. The fiber web was heated for about 5 seconds by blowing hot air at 135°C using a hot air penetration heat treatment machine. This thermally bonded (adhesive treatment) the fibers together using the high-density polyethylene of fiber 1-1. After thermal bonding (adhesive treatment), the fiber web was subjected to a cooling step in an atmosphere at room temperature of 20°C by natural cooling.

[0102] [Confounding 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 count of 90. While the fiber web was traveling at a speed of 4 m / min, a water supplier sprayed a columnar water stream at a water pressure of 3.5 MPa onto the surface of the fiber web, and then sprayed a columnar water stream at a water pressure of 3.0 MPa onto the opposite surface. The nozzle of the water supplier had orifices with a hole diameter of 0.12 mm spaced 0.6 mm apart. The distance between the surface of the laminated fiber web and the orifices was 15 mm. After the bonding process, the fiber web was subjected to the entanglement process without being wound onto a roll.

[0103] [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., to obtain a nonwoven fabric of Example 1.

[0104] <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 blending ratios of Fiber 1-1 and Fiber 2 were as shown in Table 1, respectively.

[0105] <Production of nonwoven fabric of Example 3> A fiber web consisting of only fiber 1-1 is spun at a target weight of 30 g / m 2 The nonwoven fabric of Example 3 was obtained in the same manner as in the nonwoven fabric of Example 1.

[0106] <Production of nonwoven fabric of Example 4> The nonwoven fabric of Example 4 was obtained in the same manner as 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.

[0107] <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 only 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 process and the cooling process were not performed and the entanglement process was carried out.

[0108] <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 only 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 and cooling steps were omitted, the entanglement step was carried out, and the bonding step was carried out 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.

[0109] <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 only of 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 process was carried out.

[0110] 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 (trade name) manufactured by Daiei Scientific Instruments Manufacturing 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.

[0111] <Strength and elongation> Tensile strength and elongation were measured in accordance with JIS L 1096:2010 8.14.1 Method A (strip method) using a constant-speed tension tensile tester with a sample width of 5 cm, a grip spacing of 10 cm, and a tensile speed of 30±2 cm / min. The load at break (breaking strength), breaking elongation, and stress at 10% elongation were measured. The tensile test was conducted in the machine direction (MD) and cross direction (CD) of the nonwoven fabric. The evaluation results are all shown as the average of the values ​​measured for three samples. 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.

[0112] <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 measurement was performed according to 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, lower the blade of the penetrator, which has been adjusted so that it is 8 mm below the surface of the sample stage, and when the sample piece is pressed in, read the resistance to the pressing at a position 6.7 cm (1 / 3 of the width of the sample piece) from one of the sides, at different points on both the front and back in the vertical and horizontal directions. Read the maximum value (cN) indicated by the microammeter as the resistance value. Calculate the sum of the maximum values ​​for the four sides and the average of the three measurements to determine the bending resistance (cN) of the sample when dry. The wet (WET) bending resistance 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 wet (WET) bending resistance is determined by subtracting the bending resistance of the polyethylene sheet alone from the measured value.

[0113] <Dynamic friction coefficient, coefficient of variation> The kinetic friction coefficient and coefficient of variation were measured using a static and kinetic friction tester (Tribomaster TL201Ts, manufactured by Trinity Lab Co., Ltd.). A 5 cm × 10 cm nonwoven fabric was prepared as a sample. Two sample pieces were prepared, one with the long side aligned in the MD direction and the other aligned in the CD direction. A tactile contactor (manufactured by Trinity Lab Co., Ltd.) was used as the contact terminal of the tester. After immersing 100 parts by mass of the sample piece with 1,000 parts by mass of distilled water, the sample piece was fixed to the measuring table (table sliding type) with the side opposite to the side sprayed with water during the entanglement process facing upward. The contact terminal was moved back and forth twice against the surface of the sample piece at a load of 30 gf, a speed of 10 mm / sec, and a distance of 30 mm. The kinetic friction force value after the second stroke was read, and the average of the forward and reverse values ​​was taken as the kinetic friction force (gf) of one sample piece.

[0114] Measurements were performed three times on test pieces with the long sides in the MD direction and three times on test pieces with the long sides in the CD direction, and the average of the six measurements was used as the kinetic friction force Fk (gf) for each Example and Comparative Example. The kinetic friction coefficient μk was then 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 using the standard deviation σ of the kinetic friction coefficient obtained during the measurement and the average value μk of the kinetic friction coefficients described above, according to the following formula: Coefficient of variation of dynamic friction coefficient CV=σ / μk

[0115] <Adhesion> Adhesion force was measured using a static and dynamic friction measuring instrument (Tribomaster TL201Ts, manufactured by Trinity Lab Co., Ltd.). A 12 cm x 5 cm nonwoven fabric was prepared as a sample piece. The sample pieces were prepared with the long sides in the MD and CD directions of the nonwoven fabric. Artificial skin (24 cm long x 12 cm wide, product name: BIO SKIN PLATE, manufactured and sold by Beaulux Co., Ltd.) was placed on the measuring table of the measuring instrument (sliding table type).

[0116] 100 parts by mass of the sample piece was impregnated with 1,000 parts by mass of distilled water, and the edge of the short side of the sample piece (referred to as the "clip end") was clamped horizontally with the clip of the measuring machine. The measurement table was moved, and the sample piece was placed horizontally on top of the artificial skin so that only the area from the edge opposite the clip end (referred to as the "non-clip end") to the long side of the sample, extending 8 cm, overlapped with the artificial skin. The measurement table was moved parallel to the long side of the sample, away from the clip end, at a speed of 10 mm / sec, along the long side of the sample piece, and the maximum resistance force (N) was read. 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 sprayed with the water jet during the entanglement process.

[0117] <Water retention rate> The nonwoven fabric was cut into a lengthwise (MD) x widthwise (CD) piece measuring 100 mm x 100 mm, and the mass of the nonwoven fabric was measured. The nonwoven fabric was then immersed in a test liquid (1 liter of distilled water to which two drops of dishwashing detergent (product name Joy Refreshing Orange Scent (surfactant 33%), manufactured by Procter & Gamble) were added) for two 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 rate was calculated according to the following formula: Water retention rate (%)=[(M2-M1) / M1]×100 M1: Mass of the nonwoven fabric before impregnating it with the test liquid (g) M2: Mass (g) of the nonwoven fabric after it has been soaked in the test liquid and then hung for 10 minutes

[0118] <Liquid release amount> Each test piece (5 × 15 cm, long side in MD direction) was impregnated with distilled water in an amount corresponding to the water retention rate of that piece. A liquid-absorbent sheet (Kimtowel) whose mass had been measured in advance was prepared. The liquid-absorbent sheet was placed on top of the test piece, and a test piece impregnated with 1000% distilled water was placed on top of it so that the side opposite to the side sprayed with the water flow in the entanglement process faced the liquid-absorbent sheet. An acrylic plate was placed on top of the test piece, and the acrylic plate was used to impregnate the test piece with 1 g / cm 2 A pressure of 0.01 was applied to the test piece and the liquid-absorbent sheet. The mass of the liquid-absorbent sheet was measured 1 minute, 2 minutes, 3 minutes, and 4 minutes after the start of pressure application. The liquid-absorbent sheet was replaced after each measurement, and the mass of distilled water released per minute was calculated from the increase in mass of the liquid-absorbent sheet. The amount of distilled water impregnated into each test piece was taken as the standard (100%), and the distilled water release rate for each test piece was calculated.

[0119] The evaluation results of Examples 1 to 5 and Comparative Examples 1 to 9 are shown in Tables 1 to 3.

[0120] [Table 1]

[0121] [Table 2]

[0122] [Table 3]

[0123] 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 through the entanglement process. Furthermore, the nonwoven fabrics of the Examples all had a high CD direction breaking elongation (DRY) and a low bending resistance (DRY), giving them a soft feel. The nonwoven fabrics of the Examples all had a water retention rate of 900% or more, making them suitable for use as liquid-impregnated skin dressing sheets. Furthermore, the nonwoven fabrics of Examples 1 to 5 all had good texture. This is thought to be because the entanglement process was performed in a state in which the fibers were fixed to a certain extent in the bonding process, making it difficult for the fiber web to become disordered.

[0124] The nonwoven fabrics of Comparative Examples 1 to 4 all had low stress at 10% elongation (DRY). Furthermore, 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%.

[0125] 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 step was performed after the entanglement step, which increased the number of bonding points and reduced the number of interfiber voids. Furthermore, the nonwoven fabrics of these Comparative Examples felt harder to the touch than the nonwoven fabrics of the Examples.

[0126] 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 to the touch 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.

[0127] <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 at 40% by mass, and a parallel carding machine was used to achieve a target weight of 30 g / m 2 Separately from the fiber web A, fiber 2 alone was used to produce a fiber web A having a target density of 30 g / m using a parallel carding machine. 2 A fiber web B was produced. Fiber web A was heated for about 5 seconds by blowing hot air at 135°C using a hot air penetration heat treatment machine. This caused the fibers to be thermally bonded (adhesive treatment) by the high-density polyethylene of fiber 1-1. After thermal bonding (adhesive treatment), fiber web A was subjected to a cooling step in an atmosphere at room temperature of 20°C by natural cooling. After cooling the fiber web A, the fiber web B was laminated onto the side of the fiber web A that had been blown with hot air, to obtain a laminated web.

[0128] [Confounding 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 count of 90. While the laminated web was advanced at a speed of 4 m / min, a water supply device was used to spray a columnar water stream at a water pressure of 3.5 MPa onto the surface of fibrous web B, and a columnar water stream at a water pressure of 3.0 MPa onto the opposite surface. The nozzle of the water supply device had orifices with a hole diameter of 0.12 mm spaced 0.6 mm apart. The distance between the surface of the laminated fibrous web and the orifices was 15 mm. After the bonding process, both fibrous web A and the laminated web were subjected to the entanglement process without being wound onto a roll.

[0129] [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., to obtain the nonwoven fabric of Example 1.

[0130] <Production of Nonwoven Fabrics in 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 blending ratios of fiber 1-1 and fiber 2 in fibrous web A were set as shown in Table 4.

[0131] <Production of nonwoven fabric of Example 9> The nonwoven fabric of Example 9 was obtained in the same manner as the nonwoven fabric of Example 6, except that the blending ratio of fiber 1-1 and fiber 2 in fiber web A was set 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.

[0132] <Production of Nonwoven Fabrics of Comparative Examples 10 to 13> The types of fibers used and the blending ratios of the fibers were as shown in Table 5, and the nonwoven fabrics of Comparative Examples 10 to 13 were obtained in the same manner as the nonwoven fabric of Example 6, except that the bonding process and the cooling process were not performed and the entanglement process was carried out.

[0133] The evaluation results of Examples 6 to 9 and Comparative Examples 10 to 13 are shown in Tables 4 and 5.

[0134] [Table 4]

[0135] [Table 5]

[0136] 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 but in which the fibers were integrated only by an entanglement process. Furthermore, all of the nonwoven fabrics of the Examples had high CD-direction breaking elongation (DRY) and low DRY values, giving them a soft feel. All of the nonwoven fabrics of the Examples had a DRY / thickness (1.96 kPa load) ratio of 56.0 or greater, making them flexible and suitable for use as liquid-impregnated skin dressing sheets. Furthermore, all of the nonwoven fabrics of Examples 6 to 10 had good texture.

[0137] The present disclosure includes the following aspects. (Aspect 1) A nonwoven fabric for a liquid-impregnated skin dressing sheet containing 20% ​​by mass or more of adhesive fibers, In the nonwoven fabric, the fibers are bonded to each other and entangled with each other, Weight is 15g / m 2 More than 40g / m 2 is as follows: The breaking elongation in the CD direction (DRY) is 80% or more, Water retention rate is over 900%. Nonwoven fabric for liquid-impregnated skin covering sheets. (Aspect 2) A nonwoven fabric for a liquid-impregnated skin dressing sheet containing 20% ​​by mass or more of adhesive fibers, In the nonwoven fabric, the fibers are bonded to each other and entangled with each other, Weight is 40g / m 2 Over 70g / m 2 is as follows: The breaking elongation in the CD direction (DRY) is 80% or more, The bending resistance (DRY) / thickness (1.96 kPa load) 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 of 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) 4. The nonwoven fabric for a liquid-impregnated skin-application 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) 5. The nonwoven fabric for a liquid-impregnated skin-covering sheet according to any one of Aspects 1 to 4, comprising cellulosic fibers. (Aspect 6) A liquid-impregnated skin application sheet obtained by impregnating the nonwoven fabric for a liquid-impregnated skin application sheet according to any one of aspects 1 to 5 with a liquid. (Aspect 7) A liquid-impregnated skin application sheet, wherein the liquid is impregnated in a ratio of 100 to 2000 parts by mass per 100 parts by mass of the nonwoven fabric for a liquid-impregnated skin application sheet according to any one of aspects 1 to 6. (Aspect 8) The liquid-impregnated skin-covering 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 to be subjected to the entanglement step has a basis weight of 15 g / m 2 More than 70g / m 2 is as follows: The step of winding the fibrous web into a roll is not included between the bonding step and the entangling step. A method for producing a nonwoven fabric for liquid-impregnated skin covering sheets, with a breaking elongation in the CD direction (DRY) of 80% or more. (Aspect 10) A method for producing a nonwoven fabric for a liquid-impregnated skin-covering sheet according to Aspect 9, wherein the adhesive fiber is a splittable conjugate fiber. (Aspect 11) A method for producing a nonwoven fabric for a liquid-impregnated skin application sheet according to aspect 9 or 10, wherein the entangling step comprises hydroentangling treatment. (Aspect 12) 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 comprises a hot air 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) After the bonding step, another fiber web containing 50% by mass or more of cellulosic fibers is laminated on the fiber web to form a fiber web having a basis weight of 15 g / m 2 More than 70g / m 2 a lamination step to obtain a laminated web, After the laminating step, the laminated web is subjected to the entangling step. A method for producing a nonwoven fabric according to any one of aspects 9 to 13. (Aspect 15) 15. The manufacturing method of embodiment 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. [Industrial Applicability]

[0138] The nonwoven fabric of the present disclosure contains 20% by mass or more of adhesive fibers, and the fibers are bonded and entangled, which gives the fabric excellent liquid retention, good texture, a soft feel, and relatively high strength required for stretching the nonwoven fabric at low elongation. Therefore, the nonwoven fabric of the present disclosure is useful as a substrate for sheets, such as face masks, that cover the skin while impregnated with liquid.

Claims

1. 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, Weight per unit area is 15g / m ２ 40g / m or more ２ is as follows: 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.

2. 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, Weight per unit area is 40g / m ２ More than 70 g / m ２ is as follows: The breaking elongation (DRY) in the CD direction is 80% or more, The bending resistance (DRY) / thickness (1.96 kPa load) is 56.0 or more and 100 or less; Nonwoven fabric for liquid-impregnated skin covering sheets.

3. 3. The liquid-impregnated skin application sheet according to claim 1, 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.

4. 4. The nonwoven fabric for a liquid-impregnated skin application sheet according to claim 1, wherein the adhesive fiber is a fiber derived from a splittable conjugate fiber.

5. The nonwoven fabric for a liquid-impregnated skin application sheet according to any one of claims 1 to 4, comprising cellulosic fibers.

6. A liquid-impregnated skin application sheet obtained by impregnating the nonwoven fabric for a liquid-impregnated skin application sheet according to any one of claims 1 to 5 with a liquid.

7. A liquid-impregnated skin application sheet, wherein the liquid is impregnated in a ratio of 100 parts by mass to 2,000 parts by mass per 100 parts by mass of the nonwoven fabric for a liquid-impregnated skin application sheet according to any one of claims 1 to 6.

8. The liquid-impregnated skin application sheet according to claim 7, which is a face mask.

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