JP6587608B2 - Non-woven fabric for skin impregnated skin coating sheet and method for producing the same - Google Patents

Description

  The present invention relates to a nonwoven fabric used as a base material for a sheet impregnated with cosmetics and used by being applied to the skin of a human body (referred to as “cosmetics-impregnated skin coating sheet” in the present invention), a method for producing the same, and the method The present invention relates to a cosmetic-impregnated skin coating sheet using a nonwoven fabric.

  In the beauty and cosmetic fields, cosmetic-impregnated skin-covering sheets such as face masks are manufactured and sold. As the base material of the cosmetic-impregnated skin-covering sheet, a nonwoven fabric mainly composed of hydrophilic fibers such as cotton and viscose rayon fibers is generally used. The base material of such a non-woven fabric-impregnated cosmetic-impregnated skin-covering sheet is generally white, and is nearly white even in a state in which the cosmetic is impregnated (hereinafter also simply referred to as “wet state”). Presents a color.

  In recent years, it has been difficult to use, in other words, for a face mask that can be applied to the face even if it is not attached (the skin color can be seen through) There is a growing demand. As the base material for such a face mask, a nonwoven fabric having a high transparency in a wet state is used. As the nonwoven fabric having a high transparency in the wet state, a fiber that tends to have a high transparency in the wet state, specifically, a content of an inorganic compound, in other words, a cellulosic fiber having as little ash as possible is used. Nonwoven fabrics made of cellulosic fibers are known (see Patent Document 1).

International Publication No. 2013/187404

  However, a nonwoven fabric made only of cellulosic fibers (especially a nonwoven fabric made only of cellulose-based regenerated fibers, the same applies hereinafter) maintains the shape of the nonwoven fabric only by entanglement of the fibers, so the mechanical strength of the nonwoven fabric is low. When wet, it is even lower than when dry. For example, viscose rayon, one of the cellulose-based regenerated fibers, should reduce the content of inorganic compounds (specifically, inorganic compounds such as titanium oxide and zinc oxide) contained in the viscose rayon as much as possible. However, it is known that the nonwoven fabric composed only of this viscose rayon fiber has a lower strength in the wet state than in the dry state, although it shows high transparency in the wet state. Sheets impregnated with cosmetics using such a nonwoven fabric as a base material are applied to the nonwoven fabric with a slight force, for example, the force applied to the nonwoven fabric when the sheet is taken out from the product package, or the folded sheet is unfolded. Even with force, the sheet may be stretched and the shape may be lost. Moreover, the nonwoven fabric which consists only of a cellulosic fiber is scarce in elasticity (elasticity), and the tendency appears notably in a wet state. Sheets impregnated with cosmetics using such a non-woven fabric as a base material are difficult to unfold from a folded state and may take a long time to attach to the skin, or pull the sheet with a strong force to force it to spread. For this reason, there is a risk that the shape is likely to collapse.

  To improve the handleability in wet conditions by increasing the mechanical strength and elasticity of non-woven fabrics that are made of only cellulose-based fibers that are easy to obtain transparency, specifically, the inorganic compound content is minimized. It is conceivable to increase the basis weight of the nonwoven fabric (to increase the basis weight). However, when the basis weight is increased, the transparency in a wet state is lowered, and thus the intended purpose is not met. In order to simply increase the transparency in the wet state, the nonwoven fabric has a lower basis weight (lower basis weight), but the handleability in the wet state is lowered.

  An object of the present invention is to provide a nonwoven fabric for cosmetics-impregnated skin-covering sheet, which exhibits high transparency in a state impregnated with cosmetics (wet state) and has improved handleability, and a method for producing the same. There is. Moreover, the further objective of this invention is to provide the cosmetics impregnation skin coating sheet using this nonwoven fabric.

According to one aspect of the present invention, a nonwoven fabric comprising one or more cellulose-based mixed fiber layers,
The one or more layers of the cellulose-based mixed fiber layer include, in each layer, the first cellulose-based fiber in an amount of 50% by mass or more and the thermal adhesive fiber in an amount of 8% by mass or more and 40% by mass or less. At least a part of the intersection of is thermally bonded by a thermally adhesive fiber,
The first cellulosic fiber has a fiber length of 20 mm or more and 110 mm or less, and is at least one selected from the group consisting of viscose rayon, solvent-spun cellulose, copper ammonia rayon, diacetate, and triacetate, The following conditions (a) or (b):
(A) Cellulose-based in which the content of an inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less (including 0% by mass), and the ash content is 5% by mass or less (including 0% by mass). Fiber (b) The content of an inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less, and the content of an inorganic compound having a refractive index of less than 1.6 is 5% by mass or more and 50% by mass or less. Satisfying cellulosic fibers having an ash content of greater than 5% by weight and less than or equal to 50% by weight,
The nonwoven fabric as a whole has a basis weight of 25 g / m ² or more and 48 g / m ² or less,
Provided is a non-woven fabric for a cosmetically impregnated skin-covering sheet, wherein the content of the first cellulosic fiber in the whole nonwoven fabric is 40.5% by mass or more and the content of the heat-adhesive fiber is 8% by mass or more. .

  The heat-bondable fiber may include a core-sheath type composite fiber. For example, the core-sheath type composite fiber includes a core portion containing a first polyolefin resin or polyester resin, and a second polyolefin resin having a melting point lower than the melting point of the first polyolefin resin or polyester resin. And a sheath part including the sheath part.

  The heat-adhesive fiber may contain a fiber derived from a split-type composite fiber. For example, the split type composite fiber is composed of a combination of a first polyolefin resin or polyester resin and a second polyolefin resin having a melting point lower than the melting point of the first polyolefin resin or polyester resin. obtain.

  The first cellulosic fiber is preferably at least one selected from the group consisting of viscose rayon, solvent-spun cellulose, and copper ammonia rayon.

  In one embodiment of the present invention, the cosmetic-impregnated skin-covering sheet nonwoven fabric may be composed of one layer of the cellulose-based mixed fiber layer.

  In another embodiment of the present invention, one layer of the cellulose-based mixed fiber layer and a second cellulosic fiber having a fiber length of 0.5 mm or more and less than 20 mm or a third cellulosic fiber having a fiber length of more than 110 mm Another cellulosic fiber layer containing more than 50% by mass of fibers, or a long fiber nonwoven fabric layer comprising thermoplastic resin fibers having a fiber length of more than 110 mm or continuous fibers and an ash content of 0.5% by mass or less And may be laminated. 50% by mass of the second cellulosic fiber having a fiber length of 0.5 mm or more and less than 20 mm or the third cellulosic fiber having a fiber length of more than 110 mm between the two cellulose-based mixed fiber layers. Another cellulose fiber layer containing more, or a long fiber nonwoven fabric layer made of thermoplastic resin fibers having a fiber length of more than 110 mm or continuous fibers and an ash content of 0.5% by mass or less is laminated. Also good.

  In this aspect of the present invention, the content of the second cellulosic fiber, the third cellulosic fiber, or the thermoplastic resin fiber in the whole nonwoven fabric for cosmetic-impregnated skin-covering sheet is 50% by mass or less. preferable.

  The another cellulosic fiber layer may contain more than 50% by mass of pulp fiber as the second cellulosic fiber.

According to another aspect of the present invention, there is provided a method for producing a nonwoven fabric for a cosmetically impregnated skin coating sheet according to the present invention as described above,
In each sheet, one or more cellulose-based mixed fiber sheets containing the first cellulosic fiber at 50% by mass or more and the heat-adhesive fiber at 8% by mass or more and 40% by mass or less, The first cellulosic fiber has a fiber length of 20 mm or more and 110 mm or less, and is at least one selected from the group consisting of viscose rayon, solvent-spun cellulose, copper ammonia rayon, diacetate, and triacetate, The following conditions (a) or (b):
(A) Cellulosic fiber in which the content of an inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less and the ash content is 5% by mass or less (b) An inorganic compound having a refractive index of 1.6 or more The content of the inorganic compound having a refractive index of less than 1.6 is 5% by mass or more and 50% by mass or less, and the ash content is greater than 5% by mass and 50% by mass or less. One or more cellulose-based mixed fiber sheets that satisfy the cellulose-based fiber,
In some cases, the second cellulosic fiber having a fiber length of 0.5 mm or more and less than 20 mm, or another cellulosic fiber sheet containing more than 50% by mass of the third cellulosic fiber having a fiber length of more than 110 mm, or fiber Along with a long-fiber non-woven sheet made of thermoplastic resin-based fibers having a length exceeding 110 mm or continuous fibers and an ash content of 0.5% by mass or less,
The one or more cellulose-based mixed fiber sheets and the other cellulose-based fiber sheet or the long-fiber nonwoven fabric sheet are subjected to pressing treatment and heat treatment, and the one or more cellulose-based mixed fiber layers and the other cellulose, respectively. A non-woven fiber layer or the above-mentioned long-fiber nonwoven fabric layer, smoothing the surface of the nonwoven fabric obtained thereby, and melting at least a part of the heat-adhesive fiber, so that at least a part of the intersection of the constituent fibers is a heat-adhesive fiber A manufacturing method is provided, including heat bonding.

  The pressing treatment may be performed by passing the one or more cellulose-based mixed fiber sheets between a pair of rolls, optionally together with the other cellulose-based fiber sheet or the long-fiber nonwoven fabric sheet.

  The method for producing the nonwoven fabric for cosmetically impregnated skin-covering sheet of the present invention comprises the step of applying one or more cellulose-based mixed fiber sheets, optionally the other cellulose-based fiber sheet or the long-fiber non-woven fabric before pressing and heat treatment. It may further include subjecting to hydroentanglement treatment together with the sheet.

  The pressing treatment may be performed in a wet state on the one or more cellulose-based mixed fiber sheets and optionally the other cellulose-based fiber sheet or the long-fiber nonwoven fabric sheet.

  According to a further gist of the present invention, the above-mentioned nonwoven fabric for cosmetics-impregnated skin coating sheet of the present invention is used as a base material, and the cosmetic is 150 parts by mass or more and 2500 parts by mass or less with respect to 100 parts by mass of the base material. Also provided is a cosmetically impregnated skin-coated sheet impregnated at a rate within the range of

According to the present invention, in the nonwoven fabric for cosmetically impregnated skin-covering sheet, the first cellulose fiber has a fiber length of 20 mm or more and 110 mm or less, viscose rayon, solvent-spun cellulose, copper ammonia rayon, diacetate, And at least one selected from the group consisting of triacetate, and the following conditions (a) or (b):
(A) Cellulosic fiber in which the content of an inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less and the ash content is 5% by mass or less (b) An inorganic compound having a refractive index of 1.6 or more The content of the inorganic compound having a refractive index of less than 1.6 is 5% by mass or more and 50% by mass or less, and the ash content is greater than 5% by mass and 50% by mass or less. A cellulose-based mixed fiber layer containing 50% by mass or more of the first cellulosic fiber and 8% by mass or more and 40% by mass or less of the heat-adhesive fiber is selected. Te, at least a portion of the intersections of the constituent fibers, and thermally bonded by thermal bonding fibers, for the entire nonwoven fabric, a 25 g / m ² or more basis weight, and 48 g / m ² or less, the content of the first cellulosic fibers 40.5% by mass or more, including thermal adhesive fibers Amounts are 8 mass% or more.
Thereby, in the state (wet state) impregnated with cosmetics, the nonwoven fabric for cosmetics impregnation skin covering sheets which showed high transparency and improved handleability is provided. Moreover, according to this invention, the manufacturing method of this nonwoven fabric for cosmetics impregnation skin coating sheets and a cosmetics impregnation skin coating sheet using the same are also provided.

It is a scanning electron micrograph (150 times) of the cut surface of the cellulose mixed fiber layer of the nonwoven fabric in Example 4 of this invention.

  The nonwoven fabric of this invention is a nonwoven fabric for cosmetics impregnation skin coating sheets used as a base material of a cosmetics impregnation skin coating sheet, Comprising: One or more cellulosic mixed fiber layers are comprised. Hereinafter, the nonwoven fabric for cosmetic-impregnated skin-covering sheets and the production method thereof, and the cosmetic-impregnated skin-covering sheet using the nonwoven fabric in two embodiments of the present invention will be described in detail.

  In the present invention, the term “cosmetics impregnation” means that it is suitable for impregnating cosmetics, and is not intended to be limited to “cosmetics”. It may be impregnated with other possible liquid substances such as “medicine”.

[Embodiment 1]
The present embodiment relates to a nonwoven fabric for a skin-impregnated skin-coated sheet of a single layer type composed of a single cellulose-based mixed fiber layer, a method for producing the same, and a skin-impregnated skin-coated sheet using such a nonwoven fabric.

  The cellulose-based mixed fiber layer is 50% by mass or more of the first cellulosic fiber and 8% by mass or more and 40% by mass or less of the heat-adhesive fiber (however, the total of these does not exceed 100% by mass). In addition, at least a part of the intersections of the constituent fibers is thermally bonded by the thermally adhesive fibers.

The first cellulosic fiber is constituted on the basis of cellulose, specifically, at least one selected from the group consisting of viscose rayon, solvent-spun cellulose, copper ammonia rayon, diacetate, and triacetate, And fiber length is 20 mm or more and 110 mm or less, and satisfy | fills either of the following two conditions (a) and (b) regarding the inorganic component which a fiber contains, ie, ash content.
(A) Cellulosic fiber in which the content of an inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less and the ash content is 5% by mass or less (b) An inorganic compound having a refractive index of 1.6 or more The content of the inorganic compound having a refractive index of less than 1.6 is 5% by mass or more and 50% by mass or less, and the ash content is greater than 5% by mass and 50% by mass or less. In the present invention, ash content refers to ash content measured by a method based on JIS L1015 8.20 (2010) or a method described later. Ash is considered to represent the content of all inorganic compounds (regardless of refractive index) in a given target fiber.
In the present invention, the refractive index of the inorganic compound is determined by the refractive index Becke line method. In the refractive index Becke line method, a powder of an inorganic compound is set on a preparation, a dispersion is dropped, and then a Becke line generated inside and outside the edge of the inorganic compound is visually observed with a microscope. At this time, the lens barrel is moved up and down, and the refractive index of the dispersion is adjusted until the Becke line is confirmed, and the refractive index of the inorganic compound is obtained from the refractive index of the dispersion.
Such a first cellulosic fiber can exhibit high transparency when wet. Therefore, the fact that the cellulose-based mixed fiber layer contains the first cellulose-based fiber as a main component (at 50% by mass or more) contributes to the improvement of transparency in the wet state of the finally obtained nonwoven fabric. The content of the first cellulosic fiber in the cellulosic mixed fiber layer (in this embodiment, that is, the whole nonwoven fabric) may be 50% by mass or more, but the higher one is required to obtain higher transparency. Preferably, although it depends on the basis weight of the whole nonwoven fabric, it may be, for example, 60% by mass or more, and further 70% by mass or more.

  Cellulosic regenerated fiber refers to a fiber regenerated by dissolving cellulose. Cellulose-based regenerated fiber is preferable because it tends to show a particularly high transparency in a wet state, although it depends on the amount of the inorganic compound contained in the fiber, that is, the ash content and the composition of the inorganic compound. Cellulosic regenerated fibers that can be used in the present invention include viscose rayon, solvent-spun cellulose (also referred to as purified cellulose), and copper ammonia rayon, all of which are hydrophilic and particularly high in the wet state. Shows transparency. In particular, when using viscose rayon, the effect of improving the handleability described later is remarkable. Solvent-spun cellulose is also called lyocell and is marketed under the name of Tencel (registered trademark). Copper ammonia rayon is also called cupra. The fiber cross section of the cellulosic regenerated fiber may be any form such as a substantially circular shape, a square shape, or a chrysanthemum shape, but may be, for example, a substantially circular shape or a chrysanthemum shape. When the cellulosic regenerated fiber has a chrysanthemum-like fiber cross section, the nonwoven fabric finally obtained has the advantage of exhibiting particularly high adhesion (fitness) to the skin such as the face in a wet state. A chrysanthemum-like fiber cross section can be suitably obtained when it is a viscose rayon. On the other hand, when the cellulosic regenerated fiber has a substantially circular fiber cross section, irregular reflection of light can be reduced, and the nonwoven fabric finally obtained has an advantage that it can exhibit a particularly high transparency in a wet state. A substantially circular fiber cross section can be suitably obtained in the case of solvent-spun cellulose or copper ammonia rayon. Cellulosic semi-synthetic fiber refers to a fiber synthesized by subjecting cellulose to a chemical reaction. Examples of cellulosic semisynthetic fibers that can be used in the present invention include diacetate and triacetate.

  In the first cellulosic fiber referred to in the present invention, the content of an inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less. Unlike the present invention, viscose rayon, solvent-spun cellulose, copper ammonia rayon, diacetate, and triacetate used for general nonwoven fabrics are matting agents (or may be referred to as UV shielding agents) for suppressing gloss. As an example, a powder of an inorganic compound having a high refractive index such as titanium oxide or zinc oxide is added to the raw material for spinning. However, cellulosic fibers containing a large amount of such inorganic compounds have a low transparency in a wet state. Therefore, it is preferable that the first cellulosic fiber referred to in the present invention does not contain an inorganic compound having a refractive index of 1.6 or more as much as possible, and the content of the inorganic compound having a refractive index of 1.6 or more is 0.5. Must be less than mass%. Examples of the inorganic compound having a refractive index of 1.6 or more include titanium oxide, zinc oxide, aluminum oxide, barium sulfate, and the like. As such cellulosic fibers, fibers classified as so-called “bright” can be used. In contrast, fibers classified as so-called “Dal” and “Semi-Dal” have a relatively high content of titanium oxide, generally about 1% by mass for “Dal” and 0 for “Semi-Dal”. It is about 5-0.6 mass%, and is not preferable. The content of the inorganic compound having a refractive index of 1.6 or more is preferably 0.3% by mass or less, more preferably 0.2% by mass or less, and particularly preferably 0.1% by mass or less. preferable.

  The 1st cellulosic fiber which can be used by this invention is a fiber which satisfy | fills said conditions about content of an inorganic compound with a refractive index of 1.6 or more, and an ash content is 5 mass% or less. That is, the cellulose fiber which suppressed the content of the inorganic compound whose refractive index is 1.6 or more as much as possible, and suppressed the amount of the ash which occupies for a cellulose fiber, ie, the total inorganic compound, was mentioned low. Such cellulosic fibers have a high transparency in a wet state and a low content of ash, that is, all inorganic compounds, and therefore have high hydrophilicity and excellent water retention and liquid retention. Specific examples of the first cellulosic fiber satisfying this condition include “BH rayon” sold by Daiwabo Rayon Co., Ltd. and “Tencel (registered trademark) skin” sold by Lenzing.

  Another first cellulosic fiber that can be used in the present invention satisfies the above-mentioned conditions for the content of an inorganic compound having a refractive index of 1.6 or more, and the content of the inorganic compound having a refractive index of less than 1.6. The fibers are 5% by mass or more and 50% by mass or less, and the ash content is greater than 5% by mass and 50% by mass or less. That is, cellulose fibers containing a low refractive index inorganic compound while suppressing the content of an inorganic compound having a refractive index of 1.6 or more as much as possible. Such a cellulosic fiber has a high transparency in a wet state and has a high content of ash, that is, all inorganic compounds. Therefore, the fiber becomes a flexible fiber, and the resulting nonwoven fabric also becomes a flexible nonwoven fabric. Examples of inorganic compounds having a refractive index of less than 1.6 include silicon dioxide, minerals mainly composed of silicon dioxide (for example, diatomaceous earth), sodium silicate, sodium sulfate, and the like. Specific examples of the first cellulosic fibers that satisfy this condition include “FR” and “FRL” sold by Daiwabo Rayon Co., Ltd.

  Since it is preferable that the first cellulosic fiber has hydrophilicity, it is preferable that the first cellulosic fiber does not substantially contain a carboxyl group or a carboxymethyl group.

  The fiber length of the first cellulosic fiber can be appropriately selected within a range of 20 mm or more and 110 mm or less. Such a fiber length is bulky, can provide a good hand feeling and handleability, and can be easily entangled between fibers by the hydroentanglement process described below, and feels soft when held by hand. A soft and highly transparent sheet can be obtained. The first cellulosic fiber may be a so-called staple fiber. The fiber length of the first cellulosic fiber is preferably 28 mm or more and 96 mm or less, more preferably 32 mm or more and 72 mm or less, and particularly preferably 38 mm or more and 64 mm or less.

  The fineness of the first cellulosic fiber is preferably larger from the viewpoint of obtaining a high transparency. If the fineness is thick, the number of fibers is reduced, and the irregular reflection of light is considered to be reduced. However, if the fineness is too thick, the adhesion (fitness) to the skin may be reduced, and the skin contact may be deteriorated (scratching). The fineness of the first cellulosic fiber is not particularly limited, but is, for example, not less than 0.4 dtex and not more than 4.4 dtex, preferably not less than 0.6 dtex and not more than 3.3 dtex, particularly preferably not less than 0.8 dtex and 2 .8 dtex or less.

  Thermal adhesive fibers refer to fibers that are at least partially melted by heat treatment. The heat treatment temperature can be appropriately selected according to the components of the heat-adhesive fiber. With such heat-adhesive fibers, at least some of the intersections of the fibers constituting the cellulosic mixed fiber layer are thermally bonded (fixed). The fact that the cellulose-based mixed fiber layer has a large number of heat-bonded fiber intersections (fixing points) means that the finally obtained nonwoven fabric is handled in a wet state (mechanical strength, elasticity, etc., and thus expandable in a wet state). And elongation resistance). The content of the heat-adhesive fiber in the cellulose-based mixed fiber layer (in this embodiment, that is, the whole nonwoven fabric for cosmetically impregnated skin covering sheet) may be 8% by mass or more and 40% by mass or less, but is higher. In order to obtain the handleability, it is preferable that the nonwoven fabric finally obtained is high in a range that does not impair the transparency in the wet state. For example, it may be 9% by mass or more and 37% by mass or less, and may be 10% by mass or more and 35% by mass. % Or less, more preferably 10% by mass or more and 32% by mass or less.

  Thermo-adhesive fibers are typically synthetic fibers that have a relatively high melting point (eg, greater than 140 ° C.) thermoplastic resin component (hereinafter “high melting point component”) and a lower melting point (eg, 140 ° C. or lower) and a thermoplastic resin component (hereinafter referred to as “low melting point component”), and the low melting point component is preferably a composite fiber occupying at least a part of the fiber surface. Melting | fusing point is melting | fusing point of resin after making it into a fiber, and can be calculated | required from the DSC curve measured according to JISK7121 (1987). By heat-treating such a composite fiber at a temperature lower than the melting point of the high melting point component and above the melting point of the low melting point component, the low melting point component can be melted and fused with other fibers while the high melting point component remains. It can be joined firmly.

  The high melting point component has a sufficient melting point difference from the low melting point component, preferably a melting point difference of 5 ° C. or more, more preferably 10 ° C. or more, and is not deformed by heat at a temperature at which the low melting point component is melted. It is preferable that The high melting point component may be a polyolefin resin or a polyester resin, and the low melting point component may be a polyolefin resin having a lower melting point. Specific combinations of the high melting point component / low melting point component include polypropylene / polyethylene, polypropylene / ethylene-propylene copolymer, polyethylene terephthalate / polyethylene, polyethylene terephthalate / ethylene-propylene copolymer, and the like. Polyethylene includes high density polyethylene, low density polyethylene, linear low density polyethylene, and the like.

  More specifically, the heat-adhesive fiber may be a core-sheath type composite fiber. The core-sheath type composite fiber is a composite fiber composed of two components different in the core part and the sheath part, and the arrangement of the core part and the sheath part is not particularly limited, that is, the core component exists in one place in the fiber cross section. It may be a single core or a multi-core in which core components exist in two or more locations. Further, the positional relationship between the core component and the sheath component in the fiber cross section may be a concentric shape in which the core component and the sheath component are concentrically arranged, or an eccentric type in which the core component is arranged in an eccentric manner. It may be a parallel type (also referred to as side-by-side) in which the core component and the sheath component are arranged side by side. In the non-woven fabric for skin-impregnated skin coating sheet of the present invention, it is necessary to heat-bond the fibers uniformly and to some extent with a smaller amount of heat-bonding fibers, so that the low melting point component is present on the fiber surface. It is preferable to use a core-sheath type composite fiber having a concentric fiber cross section that is uniformly distributed.

  The core-sheath type composite fiber is, for example, lower than the core portion containing the first polyolefin resin or polyester resin (high melting point component) and the melting point (high melting point component) of the first polyolefin resin or polyester resin. And a sheath portion containing a second polyolefin resin having a melting point (low melting point component). Specifically, the high melting point component may be polypropylene, polymethylpentene, polyethylene terephthalate, polytrimethylene terephthalate, etc., preferably polypropylene, and the low melting point component is high density polyethylene, low density polyethylene, linear low It may be a density polyethylene, an ethylene-propylene copolymer, polybutene-1, or the like, preferably a high density polyethylene.

  The fineness of the core-sheath type composite fiber is preferably thicker from the viewpoint of obtaining high transparency. If the fineness is thick, the number of fibers is reduced, and the irregular reflection of light is considered to be reduced. However, if the fineness is too thick, the number of fiber intersections (fixed points) to be thermally bonded decreases, which may reduce the effect of improving handleability. In addition, if the fineness of the core-sheath type composite fiber is too thick, the touch of the nonwoven fabric becomes hard, or the skin feels irritating when the non-woven fabric is brought into contact with the skin (for example, a tactile feel). There is a risk of becoming unsuitable as a base fabric. The fineness of the core-sheath type composite fiber is, for example, 0.5 dtex or more and 4.0 dtex or less, more preferably 0.8 dtex or more and 3.6 dtex or less, and particularly preferably 1.2 dtex or more and 2.8 dtex or less. Yes, it is most preferably 1.4 dtex or more and 2.6 dtex or less.

  Further, the heat-adhesive fiber may be a fiber derived from a split type composite fiber. The split type composite fiber is a composite fiber composed of two or more components, and can form a plurality of fibers having smaller fineness from one fiber by splitting. “Fiber derived from a split type composite fiber” means a single fiber formed by splitting a split type composite fiber consisting of only one section before splitting, a fiber consisting of two or more sections, and one fiber A part of the split type composite fiber is divided, but the other part is not split at all. Alternatively, as long as one split-type composite fiber may not be split at all as long as the fibers formed by splitting the split-type composite fiber are included in the cellulose-based mixed fiber layer, such split at all Undivided split type composite fibers are also included in the fibers derived from the split type composite fibers.

  Specifically, the split-type conjugate fiber is formed by dividing at least one component of the constituent components into two or more in the fiber cross section, and at least a part of the constituent components are exposed on the fiber surface, and the exposed portion is the fiber. It has a fiber cross-sectional structure formed continuously in the length direction.

  For example, the split-type conjugate fiber has a first polyolefin resin or polyester resin (high melting point component) and a second melting point lower than the melting point of the first polyolefin resin or polyester resin (high melting point component). And a combination with a polyolefin-based resin (low melting point component). Specifically, the high melting point component may be polypropylene, polymethylpentene, polyethylene terephthalate, polytrimethylene terephthalate, etc., preferably polyethylene terephthalate, and the low melting point component is high density polyethylene low density polyethylene, linear low It may be a density polyethylene, an ethylene-propylene copolymer, polybutene-1, or the like, preferably a high density polyethylene.

  The fineness of the split-type composite fiber gives an ultrafine fiber having a fineness of 0.6 dtex or less, preferably 0.5 dtex or less when divided into components (ie, when each section becomes a single fiber). If it is a thing, it will not specifically limit. In the present invention, the fibers derived from the split-type composite fibers include ultrafine fibers composed of a low melting point component, which thermally bond at least a part of the intersections of the fibers. When the fineness of the ultrafine fiber composed of the low melting point component is 0.6 dtex or less, the thermal bonding point is small, and the nonwoven fabric is not excessively hard.

  In order to generate such ultrafine fibers, the fineness of the split-type composite fiber is preferably 1.1 dtex or more and 5.8 dtex or less, more preferably 1.3 dtex or more and 4.8 dtex or less, Even more preferably, it is 1.4 dtex or more and 3.6 dtex or less, and most preferably 1.6 dtex or more and 2.8 dtex or less. In addition, the number of divisions into components in the split-type conjugate fiber (that is, the number of sections in the conjugate fiber) is, for example, preferably 4 or more and 32 or less, more preferably 4 or more and 20 or less, Most preferably, it is 6 or more and 16 or less. When the number of divisions is small, it is necessary to reduce the fineness before division in order to form ultrafine fibers with a fineness of 0.6 dtex or less. The lower limit of the fineness of the ultrafine fiber is not particularly limited, but is preferably 0.05 dtex or more.

  The shape of the section is not particularly limited. For example, the split type composite fiber may be one in which wedge-shaped sections are arranged in a chrysanthemum shape. Alternatively, the split-type composite fiber may be one in which each section is arranged in layers in the fiber cross section. Further, the split-type composite fiber may be a so-called solid split-type composite fiber that does not have a cavity portion continuous in the length direction when the fiber cross section is observed, or one or more cavities continuous in the length direction. It may be a so-called hollow split type composite fiber having a portion.

  The volume ratio of the low melting point component and the high melting point component constituting the core-sheath type composite fiber or the split type composite fiber is not particularly limited, but is, for example, 2: 8 to 8: 2, preferably 3: 7 to It may be 7: 3, more preferably 35:65 to 65:35 (low melting point component: high melting point component).

  The content of the heat-adhesive fiber in the cellulose-based mixed fiber layer (in this embodiment, that is, the whole nonwoven fabric) can be appropriately selected within the range of 8% by mass or more and 40% by mass or less. When it is a core-sheath type composite fiber, it is preferably 8% by mass or more and 35% by mass or less, and when the heat-adhesive fiber is a fiber derived from a split type composite fiber, it is 12% by mass or more and 40% by mass. % Or less is preferable. The present invention is not limited by any theory, but the reason why the range of the preferable content is different is that the split type composite fiber has a finer fineness due to the split, and therefore has the same elasticity as the core-sheath type composite fiber. It is thought that it is necessary to add more in order to obtain the effect of improvement.

  The fiber length of the heat-adhesive fiber is not particularly limited, and may be, for example, 20 mm or more and 110 mm or less. Preferably, a uniform fiber web can be easily obtained, and the fiber entanglement treatment described later is performed between the fibers. The length may be easily entangled, typically 28 mm or more and 96 mm or less. The fiber length of the thermal bonding fiber is more preferably 32 mm or more and 72 mm or less, and particularly preferably 38 mm or more and 64 mm or less.

  The heat-adhesive fiber, that is, the core-sheath type composite fiber or the split type composite fiber is a first cellulose fiber so as not to disturb the transparency of the resulting non-woven fabric for skin-impregnated skin covering sheet. Similarly, it is preferable that the ash satisfies a specific condition. That is, it is preferable that the content of the inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less and the ash content is 5% by mass or less. When the ash content of the heat-adhesive fiber satisfies the above conditions, the heat-adhesive fiber makes it difficult for the transparency of the nonwoven fabric for cosmetic-impregnated skin covering sheet of the present invention to be lowered due to the heat-adhesive fiber.

  The cellulosic mixed fiber layer contains other fibers in addition to the first cellulosic fiber and the heat-adhesive fiber as long as the effects of the present invention are not hindered, that is, the transparency and handling properties in a wet state are not deteriorated. You can leave. Examples of such other fibers include natural fibers such as pulp, hemp, silk, and wool; polyolefin fibers such as polyethylene, polypropylene, polymethylpentene, and ethylene-propylene copolymers, polyethylene terephthalate, polytrimethylene terephthalate. And polyester fibers such as polybutylene terephthalate, polyamide fibers such as nylon 6 and nylon 66, and synthetic fibers such as acrylic fibers and modified products thereof. In addition, when using fibers other than the first cellulosic fibers and the heat-adhesive fibers (the other fibers), in order not to impair the transparency of the resulting nonwoven fabric for cosmetically impregnated skin covering sheet, It is preferable that the ash content satisfies the above-mentioned conditions for the fiber as well as the first cellulose fiber. That is, the other fiber preferably has a content of an inorganic compound having a refractive index of 1.6 or more of 0.5% by mass or less and an ash content of 5% by mass or less. When the ash content of other fibers satisfies the above-described conditions, the transparency of the nonwoven fabric for cosmetic-impregnated skin-covering sheet of the present invention is less likely to decrease due to the heat-adhesive fibers.

The nonwoven fabric in this embodiment consists of a single layer of a cellulose-based mixed fiber layer as described above. The basis weight (actually measured basis weight) of the single layer type nonwoven fabric of this embodiment is 25 g / m ² or more and 48 g / m ² or less as a whole, preferably 28 g / m ² or more and 46 g / m ² or less, more preferably Is 32 g / m ² or more and 44 g / m ² or less, particularly preferably 34 g / m ² or more and 42 g / m ² or less. As a result, it is possible to realize a non-woven fabric that exhibits high transparency in a wet state and improved handling properties (developability and elongation resistance in a wet state).

  The nonwoven fabric of this embodiment can be manufactured as follows.

  First, a cellulose-based mixed fiber sheet containing a first cellulose fiber having a fiber length of 20 mm or more and 110 mm or less in an amount of 50% by mass or more and a thermal adhesive fiber in an amount of 8% by mass or more and 40% by mass or less is prepared. . The same description as above applies to the first cellulosic fiber and the heat-adhesive fiber. However, at this stage, the intersections of the constituent fibers are not yet thermally bonded by the heat-adhesive fibers, and may be undivided when the split-type composite fibers are used as the heat-adhesive fibers. This cellulose-based mixed fiber sheet is a precursor of the above-described cellulose-based mixed fiber layer, and the same description as the cellulose-based mixed fiber layer applies unless otherwise specified.

  Such a cellulosic mixed fiber sheet may be in the form of a web or in the form of a nonwoven fabric in which fibers are bonded by entanglement and / or adhesion, and in either case, it is a single layer. Alternatively, two or more laminates may be used. When the cellulosic mixed fiber sheet is a web, it may be, for example, a card web, and more specifically a parallel web, a cross web, a Chris cross web, a semi-random web, a random web, etc., preferably a parallel web It is. The air-laid web and wet web are completely randomly oriented, whereas the card web can be given orientation, which is suitable for obtaining a high transparency. In particular, in the parallel web, the number of fibers in which the fibers are oriented in one direction, particularly in the machine direction (MD) increases, and a higher transparency can be obtained in a wet state.

  Next, a single layer body (hereinafter, simply referred to as “single layer body”) composed of only one cellulose-based mixed fiber sheet is subjected to hydroentanglement treatment (spun lace). Hydroentanglement treatment can be carried out by placing a single layer on a support and injecting a columnar stream against this to entangle the fibers. In the hydroentanglement process, for example, a single layer body may be reversed in the middle (for each support), and a columnar water stream may be ejected from both the upper surface side and the lower surface side.

  In order to obtain a high transparency in the finally obtained nonwoven fabric, the surface is preferably as smooth as possible even before pressing. The hydroentanglement treatment is preferable because high smoothness can be obtained as compared with other entanglement methods such as needle punching.

  The hydroentanglement process can be generally performed using a water stream having a water pressure of 1 MPa or more and 10 MPa or less. However, in order to improve the smoothness of the single-layer body after entanglement, it is preferable to use a relatively low water pressure condition. For example, the water pressure is preferably 1 MPa or more and 7 MPa or less. Moreover, according to this hydraulic pressure condition, high extensibility can also be acquired in the nonwoven fabric finally obtained.

  Thereafter, the single-layer body is subjected to pressure treatment and heat treatment, the surface (upper surface and lower surface) of the nonwoven fabric obtained thereby is smoothed, and at least a part of the heat-adhesive fibers is melted, thereby intersecting the constituent fibers. At least a part of the film is heat-bonded with heat-bonding fibers.

  The pressing process is preferably performed by passing the single layer body between a pair of rolls because continuous processing is possible. Further, the pressing treatment is preferably performed when the monolayer is in a wet state. Since the strength of the cellulosic fibers is lower in the wet state, and since hydrogen bonds between the cellulosic fibers are cut by the wet state, higher smoothness can be obtained by performing the pressing treatment in the wet state. The liquid material impregnated into the single layer body in the pressing treatment is not particularly limited, and may be, for example, water or any aqueous composition. For convenience, the pressing process may be carried out after the hydroentanglement process, and in this case, the water used for the hydroentanglement process is impregnated into the single layer to form a wet state. The pressing process in the wet state may be performed by passing the wet monolayer through a pair of rolls. In this case, the monolayer is pressed by passing between the rolls, The liquid material impregnated in the layer body may be partially removed. When the pressing treatment is performed by passing the wet monolayer between a pair of rolls, it is preferable to press the monolayer at a linear pressure of 150 N / cm or more and 550 N / cm or less. Alternatively, the pressing process may be performed by, for example, a flat plate (plane) press. In this case, it is preferable to press the single layer body at a pressure of 0.1 MPa or more and 0.5 MPa or less.

  The heat treatment is performed at a temperature at which the heat-adhesive fibers are at least partially melted or softened because the fibers are thermally bonded to each other by the heat-adhesive fibers. For example, when a composite fiber is used as the heat-adhesive fiber, heat treatment may be performed at a temperature equal to or higher than the melting point of the low melting point component of the composite fiber and lower than the melting point of the high melting point component of the composite fiber. It is also possible to adjust the texture, strength and extensibility of the resulting nonwoven fabric by changing the heat treatment temperature within this range.

  The pressing process and the heat treatment may be performed sequentially or simultaneously. When the pressing process and the heat treatment are sequentially performed, the single layer body may be appropriately dried during the process. The drying temperature is preferably set to 100 ° C. or higher and 160 ° C. or lower, more preferably 120 ° C. or higher and 150 ° C. or lower, and particularly preferably 130 ° C. or higher and 145 ° C. or lower.

  As a result, the cellulose-based mixed fiber sheet becomes a cellulose-based mixed fiber layer, whereby the nonwoven fabric of this embodiment can be manufactured.

  The nonwoven fabric of this embodiment is suitably used as a base material for a cosmetic-impregnated skin coating sheet, impregnated with a liquid cosmetic, and used by being attached to the human skin or the like.

  Liquid cosmetics are generally aqueous compositions, and include, for example, moisturizing ingredients, cleansing ingredients, antiperspirant ingredients, scent ingredients, whitening ingredients, blood circulation promoting ingredients, UV protection ingredients, slimming ingredients, and the like as active ingredients. Although it is preferable, it is not limited to these, You may contain the arbitrary components anticipated to show | play a specific effect | action with respect to skin.

  The impregnation amount of the liquid cosmetic can be in the range of 150 to 2500 parts by mass, preferably 400 to 2000 parts by mass with respect to 100 parts by mass of the base material. By setting the cosmetic impregnation amount within this range, a sufficient amount of the active ingredient can be supplied to the skin and inconveniences such as dripping can be avoided. The optimum amount of the cosmetic material impregnated is appropriately determined depending on the properties of the cosmetic material-impregnated skin coating sheet, particularly the water absorption. In a preferred embodiment, the cosmetic impregnation amount is adjusted so that there is a cosmetic that is equal to or greater than the saturation amount of the cosmetic-impregnated skin coating sheet during the set use time.

  The cosmetic-impregnated skin coating sheet may be in the form of a face mask. The face mask is processed into a shape suitable for covering the face, and, for example, punched portions or cut portions are provided in portions corresponding to eyes, nose, and mouth as necessary. Alternatively, the face mask may be processed into a shape that covers only a part of the face (for example, the eyes, mouth, nose, or cheek). Alternatively, the face mask may be provided as a set of sheets that separately cover two or more portions.

  The cosmetic-impregnated skin-covering sheet may be enclosed in a package (for example, a packaging bag or a container) as a single sheet or a plurality of sheets in a state of being folded one or more times. In the cosmetic-impregnated skin-covering sheet, a film made of plastic or the like may be laminated on one side or both sides of a nonwoven fabric impregnated with a liquid cosmetic amount. Such a film may be peeled off when used (applied to the skin).

  The nonwoven fabric of this embodiment is easy to expand from the state of being impregnated with cosmetics, because it is difficult to stretch while exhibiting high transparency in a wet state, and is also folded. The elongation, that is, the degree of deformation of the nonwoven fabric that occurs when the state is developed can be reduced.

[Embodiment 2]
The present embodiment is a laminated type cosmetic-impregnated skin-coated nonwoven fabric composed of one or two cellulose-based mixed fiber layers and another cellulose-based fiber layer or a long-fiber nonwoven fabric layer, a method for producing the same, The present invention relates to a cosmetic amount-impregnated skin coating sheet using such a nonwoven fabric.

  First, the cellulosic mixed fiber layer, which is a laminated structure of the nonwoven fabric for cosmetically impregnated skin covering sheet of the present embodiment, and another cellulosic fiber layer and a long fiber nonwoven fabric layer that are alternatively combined with this will be described below. To do.

(Cellulose-based mixed fiber layer)
For the cellulose-based mixed fiber layer, the same description as that in Embodiment 1 applies. In the case of using two cellulose-based mixed fiber layers, the same description as that in Embodiment 1 is applied to each layer, which may be the same as or different from each other. However, in this embodiment, the content of the first cellulosic fiber in the entire nonwoven fabric finally obtained is 40.5% by mass or more, and the content of the heat-adhesive fiber is 8% by mass or more. By setting the content of the first cellulosic fiber in the whole nonwoven fabric to 40.5% by mass or more, preferably 50% by mass or more, the whole nonwoven fabric can exhibit high transparency in a wet state. Moreover, the high handleability in a wet state can be acquired in the whole nonwoven fabric by making content of the heat bondable fiber in the whole nonwoven fabric into 8 mass% or more, Preferably it is 9 mass% or more. Each content of the first cellulosic fiber and the heat-adhesive fiber in the entire nonwoven fabric is preferably selected according to the basis weight of the entire nonwoven fabric so as to achieve high transparency and excellent handleability.

(Another cellulosic fiber layer)
Another cellulosic fiber layer is laminated with one or two of the cellulosic mixed fiber layers and is distinguished from the cellulosic mixed fiber layer. Another cellulosic fiber layer is a layer containing more than 50 mass% of the second cellulosic fiber having a fiber length of 0.5 mm or more and less than 20 mm or the third cellulosic fiber having a fiber length of more than 110 mm. Any suitable fiber can be used as long as the second cellulosic fiber is composed of cellulose and has a fiber length of 0.5 mm or more and less than 20 mm. As another cellulosic fiber layer containing 50% by mass or more of the second cellulosic fiber, a wet nonwoven fabric mainly composed of the second cellulosic fiber can be cited as an example, and since the wet nonwoven fabric has high water retention, It is considered that the effect of preventing the “drip” from dripping and dropping the cosmetic when the cosmetic-impregnated skin coating sheet is used can be obtained. The content of the second cellulosic fiber in another cellulosic fiber layer may be more than 50% by mass, but may be, for example, 60% by mass or more, and further 70% by mass or more.

  The second cellulosic fiber may be, for example, a pulp fiber. Generally, the fineness of the pulp fiber is about 1.0 to 4.0 dtex and the fiber length is about 0.8 to 10 mm. However, the pulp fiber having a fineness and / or fiber length outside this range is used. Also good. Pulp fibers exhibit a certain level of transparency and exhibit moderate strength and extensibility in the wet state, so that the final nonwoven fabric can be kept highly transparent while improving its handleability. Contribute. Pulp fibers also have the advantage of high liquid retention.

  The third cellulosic fiber can be any suitable fiber as long as it is composed of cellulose and has a fiber length of more than 110 mm, but preferably has a refractive index of 1.6 or more. It is preferable that the content of the inorganic compound is 0.5% by mass or less and the ash content is 5% by mass or less. This third cellulosic fiber, particularly a third cellulosic fiber having a refractive index of 1.6 or more and an inorganic compound content of 0.5% by mass or less and an ash content of 5% by mass or less. Since the fiber layer has a high transparency in a wet state, the transparency is not easily lost even if the entire nonwoven fabric has a high basis weight. The content of the third cellulosic fiber in another cellulosic fiber layer may be more than 50% by mass, but may be, for example, 60% by mass or more, and further 70% by mass or more.

  The third cellulosic fibers may be, for example, solvent-spun cellulose long fibers or continuous fibers (substantially continuous fibers), or copper ammonia rayon (cupra) long fibers or continuous fibers. Solvent-spun cellulose long fibers and copper ammonia rayon long fibers not only exhibit high transparency, but also straddle between the cellulosic mixed fiber layer and another cellulosic fiber layer by the hydroentanglement process described below. Since the fibers can be strongly entangled, it contributes to improving the handleability while maintaining a high transparency of the finally obtained nonwoven fabric.

  The fineness of the third cellulosic fiber is preferably larger from the viewpoint of obtaining high transparency. If the fineness is thick, the number of fibers is reduced, and the irregular reflection of light is considered to be reduced. However, if the fineness is too thick, the water retention of another cellulosic fiber layer is lowered, and there is a possibility that dripping is likely to occur when used as a cosmetic-impregnated skin coating sheet. When a part of the cellulosic fiber 3 is exposed on the surface of the nonwoven fabric, when the nonwoven fabric is brought into contact with the skin, the irritation feeling (for example, tingling tactile sensation) becomes strong, and the base fabric of the cosmetic-impregnated skin coating sheet May not be suitable. The fineness of the third cellulosic fiber is, for example, 0.1 dtex or more, preferably 0.3 dtex or more, and particularly preferably 4.4 dtex or less.

  However, the second cellulosic fiber and the third cellulosic fiber are not limited to the above examples, and may be made of any material such as cellulosic regenerated fiber, cellulosic semi-synthetic fiber, cellulosic natural fiber, and the like. It can be appropriately selected according to the fiber length.

  In addition to the second cellulosic fiber or the third cellulosic fiber, the other cellulosic fiber layer is not limited to the second cellulosic fiber or the third cellulosic fiber as long as the effect of the present invention is not hindered, i.e., transparency or handling in a wet state is not deteriorated. It may contain fibers. Examples of such other fibers include natural fibers such as hemp, silk, and wool; polyolefin fibers such as polyethylene, polypropylene, polymethylpentene, and ethylene-propylene copolymers; polyesters such as polyethylene terephthalate and polybutylene terephthalate. Examples include fibers, polyamide fibers such as nylon 6 and nylon 66, and synthetic fibers such as acrylic fibers and modified products thereof. Of these, hydrophilic fibers, specifically, natural fibers such as hemp, silk, and wool, and synthetic fibers that have been subjected to a hydrophilic treatment are preferable.

(Long fiber nonwoven fabric layer)
The long fiber nonwoven fabric layer is used in place of another cellulosic fiber layer, laminated with one or two of the cellulosic mixed fiber layers, and distinguished from the cellulosic mixed fiber layer. The long fiber nonwoven fabric layer is a nonwoven fabric layer made of thermoplastic resin fibers having a fiber length of more than 110 mm or continuous fibers and an ash content of 0.5% by mass or less.

The ash content of the thermoplastic resin fibers constituting the long-fiber nonwoven fabric layer is 0.5% by mass or less, so that this long-fiber nonwoven fabric layer has a high transparency in the wet state, or inhibits the transparency in the wet state. It becomes a layer difficult to do. The ash content of the long fiber nonwoven fabric layer is preferably 0.3% by mass or less, more preferably 0.25% by mass or less, particularly preferably 0.2% by mass or less, and most preferably 0.15% by mass or less.
In the present invention, regarding thermoplastic resin fibers, ash content refers to ash content measured by a method based on JIS L1015 8.20 (2010) or a method described later. Ash is considered to represent the content of all inorganic compounds (regardless of refractive index) in a given target fiber.

  The long fiber nonwoven fabric layer is not particularly limited as long as it is a nonwoven fabric made of a fiber having a fiber length of more than 110 mm or a continuous fiber manufactured from a thermoplastic resin having an ash content of 0.5% by mass or less (manufactured from a thermoplastic resin. Fibers can also be referred to as synthetic fibers). Such thermoplastic resins include polyolefin resins such as polypropylene and polymethylpentene, polyester resins selected from polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid and copolymers thereof, nylon, and the like. 6, polyamide resins selected from nylon 12 and nylon 66; acrylic resins; engineering plastics such as polycarbonate, polyacetal, polystyrene and cyclic polyolefin; and synthetic resins such as elastomers thereof. Among these, the long fiber nonwoven fabric layer has a melting point from the viewpoint that it can be easily produced, there are many types of commercially available long fiber nonwoven fabrics, and it is preferable that the long fiber nonwoven fabric layers are not melted by heat treatment described later. It is preferably a long-fiber nonwoven fabric made of at least one synthetic resin selected from the group consisting of polyolefin resins, polyester resins, and polyamide resins that is 140 ° C. or higher, and is a polyolefin resin and / or polyester. It is more preferably a long fiber nonwoven fabric made of a resin. The production method of the long-fiber nonwoven fabric layer is not particularly limited. The spunbond nonwoven fabric obtained by the spunbond method, the meltblown nonwoven fabric obtained by the meltblown method, the nonwoven fabric produced by the electrospinning method, or the fiber length exceeds 110 mm. Although the nonwoven fabric manufactured using the fiber can be used as the above-mentioned long fiber nonwoven fabric layer, it is preferably a spunbond nonwoven fabric or a meltblown nonwoven fabric, and more preferably a spunbond nonwoven fabric.

The basis weight of the long fiber nonwoven fabric layer is not particularly limited. However, when the one or two layers of the cellulose-based mixed fiber layer and the long-fiber nonwoven fabric layer are laminated and integrated, the cellulose-based mixed fiber layer and the long-fiber nonwoven fabric layer are entangled, or the long-fiber nonwoven fabric layer In order to entangle the constituent fibers of the cellulosic mixed fiber layer with a gap therebetween, it is preferable that the long fiber nonwoven fabric layer is a nonwoven fabric having a coarse mesh and a large gap. Accordingly, the basis weight of the long fiber nonwoven fabric layer is preferably 3 g / m ² or more and 25 g / m ² or less. If the basis weight of the long-fiber nonwoven fabric layer is less than 3 g / m ² , the productivity of such a nonwoven fabric or the finally obtained nonwoven fabric for skin-impregnated skin coating sheet (laminate) may be deteriorated. If the basis weight of the long fiber nonwoven fabric layer exceeds 25 g / m ² , the transparency of the resulting laminate may be reduced. The basis weight of the long fiber nonwoven fabric layer is preferably 5 g / m ² or more and 20 g / m ² or less, more preferably 5 g / m ² or more and 18 g / m ² or less, 7 g / m ² or more, 15 g / m ² or less. Particularly preferred is m ² or less.

  The fineness of the thermoplastic resin fibers constituting the long fiber nonwoven fabric layer is not particularly limited. However, when the one or two layers of the cellulose-based mixed fiber layer and the long-fiber nonwoven fabric layer are laminated and integrated, the cellulose-based mixed fiber layer and the long-fiber nonwoven fabric layer are entangled, or the long-fiber nonwoven fabric layer Considering that the constituent fibers of the cellulose-based mixed fiber layer are entangled through each other, and considering the transparency in the wet state of the resulting laminate, the fineness of the thermoplastic resin fibers constituting the long-fiber nonwoven fabric layer is It is preferably 0.05 dtex or more and 18 dtex or less. If the fineness of the thermoplastic resin fibers constituting the long-fiber nonwoven fabric layer is less than 0.05 dtex, the long-fiber nonwoven fabric layer becomes a dense fiber layer, and the entanglement with other fiber layers decreases, There is a risk that transparency may be reduced. If the fineness of the thermoplastic resin fibers constituting the long-fiber nonwoven fabric layer is larger than 18 dtex, the nonwoven fabric may become harder or the stimulation when the nonwoven fabric touches the skin may increase. The fineness of the thermoplastic resin fibers constituting the long fiber nonwoven fabric layer is more preferably 0.8 dtex or more and 15 dtex or less, particularly preferably 1.5 dtex or more and 12 dtex or less, and 3.0 dtex or more and 10 dtex or less. Most preferably.

(Laminated structure)
The nonwoven fabric in this embodiment is composed of one or two cellulose-based mixed fiber layers similar to the cellulose-based mixed fiber described in the first embodiment, and another cellulose-based fiber layer or long-fiber nonwoven fabric layer described above. It consists of.

  More specifically, it may be a nonwoven fabric in which one cellulose-based mixed fiber layer and another cellulose-based fiber layer are laminated. Moreover, it may be a nonwoven fabric in which another cellulose-based fiber layer (intermediate fiber layer) is laminated between two cellulose-based mixed fiber layers (upper fiber layer and lower fiber layer). In any case, the content of the second cellulosic fiber or the third cellulosic fiber in the whole nonwoven fabric is preferably 50% by mass or less. When there are too many 2nd cellulosic fibers, the transparency in a wet state may fall, and when there are too many 3rd cellulosic fibers, the handleability in a wet state may fall.

  When the fiber layer to be laminated and integrated with one or two cellulose-based mixed fiber layers is another cellulosic fiber layer, the other cellulosic fiber layer is a fiber layer that is flexible and excellent in water retention, Compared to the case of using a long-fiber nonwoven fabric layer, it becomes a soft nonwoven fabric for cosmetically impregnated skin-covering sheets. A nonwoven fabric for a material-impregnated skin coating sheet is obtained.

  Alternatively, it may be a nonwoven fabric in which a single cellulose-based mixed fiber layer and a long-fiber nonwoven fabric layer are laminated. Moreover, the nonwoven fabric by which the long-fiber nonwoven fabric layer (intermediate fiber layer) was laminated | stacked between the two cellulose-type mixed fiber layers (an upper fiber layer and a lower fiber layer) may be sufficient. In any case, the content of the thermoplastic resin fiber in which the fiber length exceeds 110 mm or is a continuous fiber and the ash content is 0.5% by mass or less in the whole nonwoven fabric is 50% by mass or less. Is preferred. When there are too many 2nd cellulosic fibers, the transparency in a wet state may fall, and when there are too many 3rd cellulosic fibers, the handleability in a wet state may fall.

  When the fiber layer to be laminated and integrated with one or two cellulose-based mixed fiber layers is a long-fiber nonwoven fabric layer, this long-fiber nonwoven fabric layer is a nonwoven fabric excellent in strength. Compared with the case of using, the nonwoven fabric for cosmetics impregnation skin coating sheets which is excellent in expandability (easy to open from the folded state) and has small elongation at the time of use can be obtained.

The basis weight (measured basis weight) of the laminated type nonwoven fabric of this embodiment is 25 g / m ² or more and 48 g / m ² or less as a whole, preferably 28 g / m ² or more and 46 g / m ² or less, more preferably It is 32 g / m ² or more and 44 g / m ² , particularly preferably 34 g / m ² or more and 42 g / m ² or less. As a result, it is possible to realize a non-woven fabric that exhibits high transparency in a wet state and improved handling properties (developability and elongation resistance in a wet state).

  The nonwoven fabric of this embodiment can be manufactured as follows.

  First, one or two cellulose-based mixed fiber sheets are prepared according to a desired laminated structure. For the cellulose-based mixed fiber sheet, the same description as that in Embodiment 1 applies.

In addition, another cellulosic fiber sheet containing more than 50% by mass of a second cellulosic fiber having a fiber length of 0.5 mm or more and less than 20 mm or a third cellulosic fiber having a fiber length of more than 110 mm, or a fiber length Is a continuous fiber, and a long fiber nonwoven fabric sheet made of thermoplastic resin fibers having an ash content of 0.5% by mass or less is prepared.
The same explanation as above applies to the second cellulosic fiber and the third cellulosic fiber. This another cellulosic fiber sheet is a precursor of another cellulosic fiber layer described above, and the same explanation as that of another cellulosic fiber layer applies unless otherwise specified.
The same explanation as above applies to the thermoplastic resin fibers constituting the long-fiber non-woven sheet and having a fiber length of more than 110 mm or continuous fibers and an ash content of 0.5% by mass or less. This long fiber nonwoven fabric sheet is a precursor of the above-mentioned long fiber nonwoven fabric layer, and the same explanation as the long fiber nonwoven fabric layer applies unless otherwise specified.

  Such another cellulosic fiber sheet may be in the form of a web or in the form of a nonwoven fabric in which the fibers are bonded together by entanglement and / or adhesion. On the other hand, the long fiber nonwoven fabric sheet is in the form of a nonwoven fabric in which fibers are bonded by entanglement and / or adhesion. In any case of another cellulosic fiber sheet and a long fiber non-woven sheet, each sheet may be a single layer or a laminate of two or more layers.

  When another cellulosic fiber sheet contains more than 50% by mass of the second cellulosic fiber, such a sheet is preferably a wet web or a wet nonwoven fabric. A wet web or wet nonwoven fabric has a high proportion of fibers parallel to the surface direction of the web or nonwoven fabric, and has higher smoothness than, for example, an airlaid web or airlaid nonwoven fabric, contributing to improved transparency of the finally obtained nonwoven fabric. In addition, the uniformity (formation) of the nonwoven fabric surface is also improved. When such a sheet is a nonwoven fabric, it is also possible to use a commercially available nonwoven fabric.

  When another cellulosic fiber sheet includes a second cellulosic fiber, the second cellulosic fiber may be a pulp fiber. When another cellulosic fiber sheet is composed of pulp fibers, it can be provided as a floc pulp (fluff pulp) in addition to the web or non-woven fabric as described above in forming the laminate. In particular, the pulp fiber has a flat fiber cross section, and the wet web or wet nonwoven fabric including this has a configuration in which flat surfaces are laminated when hydroentangled, and the pulp fiber is difficult to be exposed on the sheet surface. It is preferably used because it hardly affects the texture of the cellulose-based mixed fiber layer. In addition, wet nonwoven fabrics are relatively easy to break in a wet state, and contribute to improving the elongation resistance of the finally obtained nonwoven fabric. A wet nonwoven including pulp fibers (or consisting essentially of pulp fibers) includes paper. The paper includes a tissue (also referred to as a tissue paper) that is made only of pulp fibers and in which the fibers are bonded together by a binder and / or hydrogen bond. Further, the paper includes so-called crepe paper processed into a wave shape or a corrugated shape.

  When another cellulosic fiber sheet includes the third cellulosic fiber, the third cellulosic fiber may be a long fiber or continuous fiber of purified cellulose fiber or copper ammonia rayon fiber. When another cellulosic fiber sheet is composed of long or continuous fibers of copper ammonia rayon fiber, a commercially available cellulosic long fiber nonwoven fabric such as “Benlyse” (manufactured by Asahi Kasei Fibers Co., Ltd.) may be used.

  Then, one or two cellulose-based mixed fiber sheets and another cellulose-based fiber sheet or long-fiber nonwoven fabric sheet are laminated.

  More specifically, one layer of cellulose-based mixed fiber sheet and another cellulose-based fiber sheet may be laminated to form a laminate. Further, another cellulose-based fiber sheet (intermediate fiber sheet) may be laminated between two layers of cellulose-based mixed fiber sheets (upper fiber sheet and lower fiber sheet) to form a laminate.

  Alternatively, a single-layer cellulose-based mixed fiber sheet and a long-fiber nonwoven fabric sheet may be laminated to form a laminate. Moreover, a long-fiber nonwoven fabric sheet (intermediate fiber sheet) may be laminated between two layers of cellulose-based mixed fiber sheets (upper fiber sheet and lower fiber sheet) to form a laminate.

  Next, a laminate obtained by laminating one or two cellulose-based mixed fiber sheets thus obtained and another cellulose-based fiber sheet or a long-fiber nonwoven fabric sheet (hereinafter simply referred to as “laminate”). Is subjected to hydroentanglement treatment (span lace).

  Thereafter, the laminate is subjected to pressing treatment and heat treatment to smooth the surface (upper surface and lower surface) of the nonwoven fabric obtained thereby, and at least a part of the heat-adhesive fiber is melted, At least a part is thermally bonded by a thermally adhesive fiber.

  Regarding the hydroentanglement process, the pressing process, and the heat treatment, the same description as that described for the single-layer body in the first embodiment applies.

  In particular, when another cellulosic fiber sheet contains more than 50% by mass of the second cellulosic fiber, applying hydroentanglement treatment can increase the transparency and elongation resistance of another cellulosic fiber sheet, As a result, the transparency and elongation resistance of the entire nonwoven fabric finally obtained can be further enhanced. The reason is that the present invention is not bound by any theory, but is considered as follows. When the hydroentanglement process is applied, the amount of fibers is relatively small in the portion where the columnar water stream is struck, and this appears in a streak form on the nonwoven fabric. Such a streak portion having a relatively small amount of fiber is referred to as a “streaky low fiber density portion” in the present specification, and usually appears in the machine direction (MD), but is not limited thereto. In the streaky low fiber density portion, the amount of fibers is relatively small, so that a high transparency can be obtained in a wet state. Further, since the amount of fibers in the streaky low fiber density portion is relatively small, the direction (usually the width direction (CD)) orthogonal to the direction of the streaky low fiber density portion (usually the longitudinal direction (MD)). Elongate easily. And when another cellulosic fiber sheet contains the 2nd cellulosic fiber, since the 2nd cellulosic fiber has short fiber length and is hydrophilic, it is easy to fall off by columnar water flow, and water As a result, it is considered that the amount of fibers is particularly small in the streaky low fiber density portion, and a higher transparency and elongation resistance can be obtained. Among the sheets finally obtained, the cellulose-based mixed fiber layer (the upper fiber layer and the lower fiber layer in the case of the three-layer structure) mainly composed of the first cellulosic fibers is in a wet state as described above. Shows particularly high transparency. On the other hand, another cellulosic fiber layer (intermediate fiber layer in the case of a three-layer structure) mainly composed of the second cellulosic fiber has liquid retention (liquid retention) in a wet state rather than transparency. ). And when the hydroentanglement process is applied as described above, the fiber amount of another cellulosic fiber layer can be effectively reduced particularly in the streaky low fiber density portion, and the transparency of another cellulosic fiber layer can be reduced. It is considered that the feeling and stretchability can be enhanced, and as a result, the transparency and stretchability of the entire sheet finally obtained can be further enhanced.

  As a result, the cellulose-based mixed fiber sheet and another cellulose-based fiber sheet or long-fiber non-woven sheet become a cellulose-based mixed fiber layer and another cellulose-based fiber layer or long-fiber non-woven layer, respectively. The nonwoven fabric of embodiment can be manufactured.

  The nonwoven fabric of the present embodiment is also suitably used as a base material for a cosmetic-impregnated skin coating sheet, impregnated with a liquid cosmetic material, and used by being attached to the human skin or the like. The impregnation amount of the liquid cosmetic can be in the range of 150 to 2500 parts by mass, preferably 400 to 2000 parts by mass with respect to 100 parts by mass of the base material. About the cosmetics impregnation skin covering sheet, the description similar to the description in Embodiment 1 applies.

  As described above, through the two embodiments of the present invention, the nonwoven fabric of the present invention, the production method thereof, and the cosmetic-impregnated skin-covering sheet using the nonwoven fabric have been described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made.

  In the above-described first and second embodiments, the hydroentanglement process is performed before the pressing process. However, it should be noted that this is not necessarily required for the method for producing a nonwoven fabric of the present invention. For example, although the preference is inferior, even if the hydroentanglement process is carried out after the pressing process, it is replaced with the hydroentanglement process and / or interfiber bonding process, for example, chemical bond, thermal bond, needle punch, etc. May be implemented.

  Moreover, in the above-mentioned Embodiment 2, the nonwoven fabric which has a laminated structure comprised from one layer or two layers of cellulose type mixed fiber layers and one layer of another cellulose type fiber layer or a long fiber nonwoven fabric layer was demonstrated. However, as long as the transparency of the sheet is not significantly impaired, one or more other layers may be present on one or both surfaces of the laminated structure or between two adjacent layers. Alternatively, a non-woven fabric may be formed by laminating one cellulose-based mixed fiber layer between two other cellulose-based fiber layers or long-fiber non-woven fabric layers.

  Moreover, the use of the cosmetic-impregnated skin coating sheet obtained by the present invention is not limited to a face mask, and can be used for various uses. For example, a sheet impregnated with a liquid cosmetic containing a moisturizing component may be used by sticking to a neck, elbow or heel. Or you may stick and use the sheet | seat impregnated with the liquid cosmetics containing a slimming component on an abdomen or a thigh. Alternatively, a sheet impregnated with a liquid drug such as an analgesic / anti-inflammatory agent can be used by sticking it to the elbow, shoulder, waist or ankle.

  Hereinafter, the present invention will be described with reference to examples.

In this example and a comparative example, the following were prepared as another cellulosic fiber sheet including the first cellulosic fiber and the heat-adhesive fiber and the second cellulosic fiber used in the cellulosic mixed fiber sheet.
[First cellulosic fiber]
・ Rayon: Viscose rayon with a fineness of 1.7 dtex and fiber length of 40 mm (manufactured without adding titanium oxide to the viscose solution at the time of manufacture. Ash content 0.09% by mass, trade name “BH”, Daiwabo Rayon Co., Ltd.) Made)
[Thermo-adhesive fiber]
Core-sheath A: Core-sheath type composite fiber made of polypropylene (core part) / high-density polyethylene (sheath part) having a fineness of 1.7 dtex and a fiber length of 51 mm (ash content: 0.05% by mass, manufactured by Huvis Corporation)
Core-sheath B: Core-sheath type composite fiber consisting of polypropylene (core part) / high-density polyethylene (sheath part) having a fineness of 1.7 dtex and a fiber length of 51 mm (ash content: 0.06% by mass, trade name “NBF (H)”) , Manufactured by Daiwabo Polytech Co., Ltd.)
Core-sheath C: Core-sheath type composite fiber consisting of polypropylene (core part) / high-density polyethylene (sheath part) having a fineness of 2.2 dtex and a fiber length of 51 mm (ash content: 0.06% by mass, trade name “NBF (H)”) , Manufactured by Daiwabo Polytech Co., Ltd.)
Core-sheath D: Core-sheath type composite fiber composed of polypropylene (core part) / high-density polyethylene (sheath part) having a fineness of 3.3 dtex and a fiber length of 51 mm (ash content: 0.06% by mass, trade name “NBF (H)”) , Manufactured by Daiwabo Polytech Co., Ltd.)
Split A: Split composite fiber with a split number of 8 consisting of a polyethylene terephthalate / high-density polyethylene combination with a fineness of 2.2 dtex and a fiber length of 51 mm (the fiber having the smallest fineness among the fibers formed by splitting has a fineness of 0 275 dtex (trade name “DFS (SH)”, manufactured by Daiwabo Polytech Co., Ltd.)
[Another cellulosic fiber sheet containing the second cellulosic fiber]
-Wet non-woven fabric consisting of 100% by mass of pulp fibers (weight per unit: 17g / m ² or 26g / m ² , average fiber length: 5mm), manufactured by Habix

[Fiber ash]
The ash content of cellulosic fibers and thermoplastic resin fibers can be measured by a method based on JIS L1015 8.20 (2010) or a method (procedure) described later. More specifically, when such ash content cannot be measured by a method in accordance with JIS L1015 8.20 (2010) (for example, a device or the like specified in this cannot be prepared) or more easily measured, It can be measured by the following procedure.
First, a crucible is prepared, heated in an electric furnace set at 600 ° C. for 1 hour or more, and the mass after cooling (constant weight of the crucible: M ₁ (g)) is measured. Next, 1 to 10 g of a fiber (sample) for measuring ash content is prepared, and its mass (sample mass: M _f (g)) is measured with an electronic balance. Next, using a gas burner, the crucible whose constant weight was measured was heated for 2 minutes, and the crucible was sufficiently heated. After sufficiently heating the crucible, a little sample (fiber whose mass has been measured) is added and heated until the inserted fiber becomes a black ash. When the input fibers become black ash, the operation of adding the remaining samples little by little is repeated until all the samples (fibers whose mass has been measured) are input into the crucible.
Put all samples in the crucible and heat until no smoke comes out of the crucible. When no more smoke is generated from the crucible, cover the crucible so that a little gap is left, put it in the muffle, and ignite again with a gas burner for over 1 hour. After confirming that the sample is completely white ash, remove the crucible from the muffle, place it in a desiccator, and cover the crucible to cool. After cooling, the lid is removed and the combined mass of the crucible and ash (M ₂ (g)) is measured.
Therefore, the mass of ash obtained using the above sample is M ₂ −M ₁ (g), and the ash content (mass%) is calculated by the following formula.

[Single layer type non-woven fabric]
Example 1
Preparation of cellulose-based mixed fiber sheet (single layer) 80% by mass of the above-mentioned “rayon” as the first cellulose-based fiber and 20% by mass of the “core-sheath A” as the heat-adhesive fiber are mixed in parallel. Using a card machine, a parallel web (cellulosic mixed fiber sheet) was produced at a weight per unit area (web target per unit area) of about 35 g / m ² .
-Hydroentanglement process This web (cellulosic mixed fiber sheet monolayer) was placed on a net and subjected to hydroentanglement process while proceeding at a speed of 4 m / min. In the water entangling process, a columnar water flow with a water pressure of 1 MPa and 2 MPa is applied once to the upper surface of the single layer body using a water jet device equipped with a nozzle having a hole diameter of 0.10 mm provided at intervals of 0.6 mm. Then, using the same water jet apparatus, a columnar water flow having a water pressure of 1 MPa and 2 MPa was sprayed once on the lower surface of the single layer body. The distance between the surface of the monolayer and the orifice was 15 mm. A plain weave polyethylene terephthalate net having a warp wire diameter of 0.132 mm, a weft wire diameter of 0.132 mm, and a mesh number of 90 mesh was used as the net.
-Pressing treatment The monolayer after hydroentanglement was subjected to pressing treatment at a linear pressure of 350 N / cm through a pair of mangle rolls.
-Drying treatment and heat treatment Thereafter, the monolayer was exposed to hot air at 140 ° C for about 1 minute, and the drying treatment and the heat treatment were simultaneously performed. By this heat treatment, only the high-density polyethylene constituting the heat-adhesive fiber was melted, and the constituent fibers were heat-bonded with the high-density polyethylene to obtain a nonwoven fabric.

(Examples 2 to 10, Comparative Example 1)
As shown in Table 1, the ratio of the first cellulosic fibers, the type and ratio of the heat-adhesive fibers (not used in Comparative Example 1), and the basis weight (target web weight) are as follows. After that, hydroentanglement treatment, pressing treatment and heat treatment (also serving as drying treatment) were carried out under the same conditions as those employed in Example 1 to obtain a nonwoven fabric.

[Laminated nonwoven fabric]
(Example 11)
-Preparation of cellulose-based mixed fiber sheet 80% by mass of the above-mentioned "rayon" as the first cellulose-based fiber and 20% by mass of the "core-sheath A" as the heat-adhesive fiber are mixed using a parallel card machine. ^Two parallel webs (cellulosic mixed fiber sheets) were prepared at a basis weight (target web aim) of about 11.5 g / m ² .
・ Production of laminated body Between these two webs (cellulosic mixed fiber sheet), a wet nonwoven fabric composed of 100% by mass of pulp fibers (weight per unit: 17 g / m ² , average fiber length: 5 mm) (another cellulosic fiber sheet) A laminate having a three-layer structure was produced.
・ Water entanglement treatment This laminate (cellulosic mixed fiber sheet (top) / cellulosic fiber sheet (middle) / cellulosic mixed fiber sheet (bottom) laminate) is placed on a net and the speed is 4 m. It was subjected to hydroentanglement treatment while proceeding at / min. In the water entangling process, a columnar water flow with a water pressure of 1 MPa and 2 MPa is applied to the upper surface of the laminated body once by using a water jet device provided with a nozzle having a hole diameter of 0.10 mm provided at intervals of 0.6 mm. After that, using a similar water jet device, a columnar water flow having a water pressure of 1 MPa and 2 MPa was sprayed once on the lower surface of the laminate. The distance between the surface of the laminate and the orifice was 15 mm. A plain weave polyethylene terephthalate net having a warp wire diameter of 0.132 mm, a weft wire diameter of 0.132 mm, and a mesh number of 90 mesh was used as the net.
-Pressing process The laminated body after the water flow entanglement was passed through a pair of mangle rolls and subjected to a pressing process at a linear pressure of 350 N / cm.
-Drying treatment and heat treatment Thereafter, the laminate was exposed to hot air at 140 ° C for about 1 minute, and the drying treatment and the heat treatment were simultaneously performed. By this heat treatment, only the high-density polyethylene constituting the heat-adhesive fiber was melted, and the constituent fibers were heat-bonded with the high-density polyethylene to obtain a nonwoven fabric.

(Example 12, Comparative Examples 2-6)
As shown in Table 2, the ratio of the first cellulosic fibers, the type and ratio of heat-adhesive fibers (not used in Comparative Example 2), and the basis weight (web target weight) are as shown in Table 2. Two sheets are prepared, and a wet nonwoven fabric of pulp fibers (another cellulosic fiber sheet) is prepared with a basis weight as shown in Table 2, and is sandwiched between these two webs to produce a three-layer structure laminate. (Laminated body composed of cellulose-based mixed fiber sheet (upper) / another cellulose-based fiber sheet (middle) / cellulose-based mixed fiber sheet (lower)), and then hydroentangled under the same conditions as those employed in Example 11 Then, a pressing treatment and a heat treatment (also serving as a drying treatment) were performed to obtain a nonwoven fabric.

  About the nonwoven fabrics obtained in Examples 1 to 12 and Comparative Examples 1 to 6, the measured basis weight, thickness, physical properties at the time of drying, physical properties at the time of wetness and feeling of use were evaluated according to the following methods. An evaluation result is combined with Table 1 and Table 2, and is shown. Moreover, the scanning electron micrograph (150 times) of the cut surface of the cellulose mixed fiber layer of the nonwoven fabric obtained in Example 4 is shown in FIG.

[Measured basis weight, thickness, specific volume]
The measured basis weight (actually measured value) of the nonwoven fabric was calculated by measuring the mass of a sample piece having a predetermined size without being wetted with cosmetics or water.
The thickness of the non-woven fabric is 3 g per 1 cm ^{2 of} sample using a thickness measuring machine (trade name “THICKNESS GAUGE”, model CR-60A, manufactured by Daiei Kagaku Seisakusho Co., Ltd.) and not wet with cosmetics or water. It measured in the state which applied the load of.
The specific volume of the nonwoven fabric was calculated from the basis weight (measured value) and thickness.

[Physical properties when dried and wet: tensile strength, elongation at break, stress at 10% elongation]
In accordance with JIS L 1096 6.12.1 A method (strip method), using a constant-speed tension type tensile tester, tension was performed under the conditions of a sample piece width of 5 cm, a grip interval of 10 cm, and a tensile speed of 30 ± 2 cm / min. It attached to the test and measured the load value at the time of cutting (tensile strength), elongation at break, and stress at 10% elongation. The tensile test includes both a sample piece that is not wetted with cosmetics or water (when dry) and a sample piece that is impregnated with 200 parts by weight of distilled water (when wet) with respect to 100 parts by weight of the sample. Was carried out in two tensile directions, the machine direction (MD) and the width direction (CD). All the evaluation results are shown as an average of values measured for three samples.

[Usage evaluation]
In order to evaluate the feeling of use when the nonwoven fabric of the present invention was used as a wet sheet, sensory evaluation was performed by the following method.
The nonwoven fabric was cut into a size of 20 cm long × 20 cm wide. Next, a commercially available cosmetic (Rohto Pharmaceutical Co., Ltd. Gokujun (registered trademark) hyaluronic liquid) was weighed out to 100 parts by mass with respect to 100 parts by mass of the nonwoven fabric sample. The cut non-woven fabric is first folded in three, and then folded in the long side direction into a polyethylene bag, and weighed cosmetics are placed therein, while maintaining the state in which the non-woven fabric sample is folded. The nonwoven fabric was sufficiently impregnated with cosmetics by being left on a flat surface for 24 hours in a weighted state. The sample was gently taken out from the polyethylene bag and spread from the folded state, and the unfoldability (ease of spreading) and elongation resistance (hardness to stretch) were evaluated. An adult woman touched the surface of the sample spread in a sheet shape with a fingertip to evaluate the softness of the nonwoven fabric, and then applied to the face to evaluate transparency and adhesion. The evaluation criteria for transparency, adhesion, softness, developability (ease of spreading), and elongation resistance (deformability) after deployment are as follows.
(1) Transparency +++: The color of the wearer's skin can be seen through, and the color of the nonwoven fabric can hardly be confirmed.
++: The wearer's skin color can be seen through, but the color of the nonwoven fabric can also be confirmed.
+: Although the skin color of the wearer can be seen through, it is difficult to confirm the skin color due to the color of the nonwoven fabric.
-: The wearer's skin color is completely transparent.
(2) Feeling of adhesion ++++: Very high adhesion to the skin, and no peeling occurs at the time of wearing.
++: Good adhesion to skin and difficult to peel off when worn.
+: Adhesion to skin is somewhat inferior, but can be used as a cosmetic-impregnated skin-covering sheet.
−: Even when worn on the skin, it does not feel close to the skin and easily peels off.
(3) Softness +++: Very soft and good against the skin, and there is no irritation on the nonwoven fabric surface.
++: The touch is soft and the skin feels good, and the nonwoven fabric surface is less irritating.
+: Although there is hardness in touch, there is no strong irritation, and it can be used as a cosmetic-impregnated skin coating sheet.
-: The nonwoven fabric is hard and feels strong irritation on the skin.
(4) Expandability ++++: There is no sticking between the nonwoven fabrics, and it can be easily and completely opened in a short time.
++: Although there is sticking between non-woven fabrics, it can be easily opened completely.
+: Although it can be opened completely, it takes some time to open due to sticking between the nonwoven fabrics.
-: It cannot be opened in a part or it takes a considerable time to open completely.
(5) Elongation resistance after development +++: The nonwoven fabric hardly stretches after opening.
++: The nonwoven fabric is slightly stretched after opening.
+: After opening, the nonwoven fabric is stretched, but the shape is broken so that it can be used.
-: After opening, the nonwoven fabric is stretched and the shape is greatly collapsed.

  For the single layer type, as shown in Table 1, the nonwoven fabric of Example 1 has a sense of transparency, among the transparency, adhesion, softness, developability, and elongation resistance after deployment, which are evaluation items for use. Use as a cosmetic-impregnated skin-covering sheet because both the development and the elongation resistance after development are evaluated as “++” or higher, and there is no “−” evaluation for any item. It was suitable for. Compared to the nonwoven fabric of Example 1, the nonwoven fabric of Comparative Example 1 was inferior in developability and elongation resistance after deployment. The nonwoven fabrics of Examples 2 to 7, 9, and 10 are all evaluated as “++” or more for transparency, developability, and elongation resistance after deployment, and there is no “−” evaluation for any item. And was suitable for use as a cosmetic-impregnated skin coating sheet. Although the non-woven fabric of Example 8 is inferior to the non-woven fabrics of Examples 1 to 7, 9, and 10, transparency is an evaluation of “++” or more and developability compared to the non-woven fabric of Comparative Example 1. It was excellent. In Comparative Example 1, although the fibers are entangled with each other, since no heat-adhesive fibers are used, they are not heat-bonded. In Examples 1 to 10 of the present invention, As is understood from the electron micrograph (FIG. 1) of the cut surface of the cellulose-based mixed fiber layer of the nonwoven fabric, in particular, the cellulose-based structure composed of the first cellulosic fibers and the heat-bonding fibers. In the mixed fiber layer, it is considered that at least a part of the intersections of the constituent fibers is thermally bonded by the heat-adhesive fibers, so that the handleability is improved while exhibiting high transparency in a wet state.

  Regarding the laminated type, as shown in Table 2, the nonwoven fabric of Example 11 has a sense of transparency, development among the sense of use, transparency, adhesion, softness, developability, and elongation resistance after deployment. High evaluation that both the property and the elongation resistance after development are “++” or higher, and that there is no “−” evaluation for any item, it is used as a cosmetic-impregnated skin covering sheet. It was suitable for. Compared to the nonwoven fabric of Example 11, the nonwoven fabric of Comparative Example 2 was inferior in elongation resistance after deployment. The non-woven fabric of Example 12 also has a high evaluation that transparency, developability, and elongation resistance after development are all “++” or higher and that there is no “−” evaluation for any item. It was suitable for use as a cosmetic-impregnated skin coating sheet. In Comparative Example 2, the fibers are entangled but are not thermally bonded because no heat-adhesive fibers are used. In Examples 11 and 12 of the present invention, In particular, in the cellulosic mixed fiber layer composed of the first cellulosic fibers and the heat-bonding fibers, at least a part of the intersections of the constituent fibers are thermally bonded by the heat-bonding fibers. Thus, in a wet state, it is considered that the handleability was improved while showing a high transparency.

  Moreover, as understood from Table 2, the nonwoven fabrics of Comparative Examples 3 to 6 are inferior in transparency compared to the nonwoven fabrics of Examples 11 and 12, although heat-adhesive fibers are used. In Comparative Examples 4 and 6, the developability was also inferior. In the comparative example 3, since the fabric weight of the whole nonwoven fabric was too high, it is thought that the transparency was reduced. In Comparative Example 4, it is considered that the expandability was insufficient because the content of the heat-adhesive fiber in the entire nonwoven fabric was small. In Comparative Example 5, it is considered that the transparency was lowered because the content of the first cellulosic fiber in the whole nonwoven fabric was small. In Comparative Example 6, the basis weight of the whole nonwoven fabric is too high, the content of the first cellulosic fiber in the whole nonwoven fabric is small, and the content of the second cellulosic fiber is large, so that the transparency is lowered. It is considered that the deployability has become insufficient.

  The nonwoven fabric of this invention is used suitably as base materials, such as a face mask impregnated with cosmetics.

  This application claims the priority based on Japanese Patent Application No. 2014-72535 for which it applied to Japan on March 31, 2014, and all the description content is used by reference in this specification.

Claims (14)

It is a nonwoven fabric including one or more cellulose-based mixed fiber layers,
The one or more layers of the cellulose-based mixed fiber layer include, in each layer, the first cellulose-based fiber in an amount of 50% by mass or more and the thermal adhesive fiber in an amount of 8% by mass or more and 40% by mass or less. At least a part of the intersection of is thermally bonded by a thermally adhesive fiber,
The first cellulosic fiber has a fiber length of 20 mm or more and 110 mm or less, and is at least one selected from the group consisting of viscose rayon, solvent-spun cellulose, copper ammonia rayon, diacetate, and triacetate, The following conditions (a) or (b):
(A) Cellulosic fiber in which the content of an inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less and the ash content is 5% by mass or less (b) An inorganic compound having a refractive index of 1.6 or more The content of the inorganic compound having a refractive index of less than 1.6 is 5% by mass or more and 50% by mass or less, and the ash content is greater than 5% by mass and 50% by mass or less. To fill the cellulosic fiber,
The nonwoven fabric as a whole has a basis weight of 25 g / m ² or more and 48 g / m ² or less,
In the whole nonwoven fabric, and the content of the first cellulosic fiber 40.5% by mass or more state, and are the content of the thermally adhesive fiber is 8 mass% or more,
The thermal adhesive fiber includes a core-sheath type composite fiber and / or a fiber derived from a split type composite fiber,
The fineness of the core-sheath type composite fiber is 0.5 dtex or more and 4.0 dtex or less,
The fineness of the split type composite fiber is 1.1 dtex or more and 5.8 dtex or less,
Nonwoven fabric for cosmetic impregnated skin coating sheet. A sheath in which the core-sheath type composite fiber includes a core portion containing the first polyolefin resin or polyester resin, and a second polyolefin resin having a melting point lower than the melting point of the first polyolefin resin or polyester resin. parts is composed of a, according to claim 1 cosmetic impregnated skin covering sheet for nonwovens. The split type composite fiber is composed of a combination of a first polyolefin resin or polyester resin and a second polyolefin resin having a melting point lower than the melting point of the first polyolefin resin or polyester resin. The nonwoven fabric for cosmetics-impregnated skin-covering sheets according to claim 1 or 2 . The cosmetic-impregnated skin-coated sheet according to any one of claims 1 to 3 , wherein the first cellulosic fiber is at least one selected from the group consisting of viscose rayon, solvent-spun cellulose, and copper ammonia rayon. Nonwoven fabric. The nonwoven fabric for cosmetic-impregnated skin-covering sheets according to any one of claims 1 to 4 , comprising one layer of the cellulose-based mixed fiber layer. Another layer containing more than 50% by mass of one layer of the cellulose-based mixed fiber layer and a second cellulosic fiber having a fiber length of 0.5 mm or more and less than 20 mm or a third cellulosic fiber having a fiber length of more than 110 mm A cellulosic fiber layer or a long fiber nonwoven fabric layer made of thermoplastic resin fibers having a fiber length of more than 110 mm or continuous fibers and an ash content of 0.5% by mass or less is laminated. The nonwoven fabric for cosmetics impregnation skin coating sheets in any one of 1-4 . More than 50% by mass of a second cellulosic fiber having a fiber length of 0.5 mm or more and less than 20 mm or a third cellulosic fiber having a fiber length of more than 110 mm between the two cellulose-based mixed fiber layers Another cellulosic fiber layer containing, or a long fiber nonwoven fabric layer made of thermoplastic resin fibers having a fiber length of more than 110 mm or continuous fibers and an ash content of 0.5% by mass or less, is laminated. Item 5. A nonwoven fabric for cosmetics-impregnated skin-covering sheet according to any one of Items 1 to 4 . The cosmetic-impregnated skin according to claim 6 or 7 , wherein a content of the second cellulosic fiber or the third cellulosic fiber or a content of the thermoplastic resin fiber in the whole nonwoven fabric is 50% by mass or less. Nonwoven fabric for coated sheets. The nonwoven fabric for cosmetically impregnated skin-coated sheets according to any one of claims 6 to 8 , wherein the another cellulosic fiber layer contains more than 50 mass% of pulp fibers as the second cellulosic fibers. A method of manufacturing a reduction粧料impregnated skin covering sheet non-woven,
In each sheet, one or more cellulose-based mixed fiber sheets containing the first cellulosic fiber at 50% by mass or more and the heat-adhesive fiber at 8% by mass or more and 40% by mass or less, The first cellulosic fiber has a fiber length of 20 mm or more and 110 mm or less, and is at least one selected from the group consisting of viscose rayon, solvent-spun cellulose, copper ammonia rayon, diacetate, and triacetate, The following conditions (a) or (b):
(A) Cellulosic fiber in which the content of an inorganic compound having a refractive index of 1.6 or more is 0.5% by mass or less and the ash content is 5% by mass or less (b) An inorganic compound having a refractive index of 1.6 or more The content of the inorganic compound having a refractive index of less than 1.6 is 5% by mass or more and 50% by mass or less, and the ash content is greater than 5% by mass and 50% by mass or less. One or more cellulose-based mixed fiber sheets that satisfy the cellulose-based fiber,
In some cases, the second cellulosic fiber having a fiber length of 0.5 mm or more and less than 20 mm, or another cellulosic fiber sheet containing more than 50% by mass of the third cellulosic fiber having a fiber length of more than 110 mm, or fiber Along with a long-fiber non-woven sheet made of thermoplastic resin-based fibers having a length exceeding 110 mm or continuous fibers and an ash content of 0.5% by mass or less,
The one or more cellulose-based mixed fiber sheets and the other cellulose-based fiber sheet or the long-fiber nonwoven fabric sheet are subjected to pressing treatment and heat treatment, respectively, and the one or more cellulose-based mixed fiber layers and the other cellulose, respectively. A non-woven fabric layer or a long-fiber nonwoven fabric layer, smoothing the surface of the nonwoven fabric obtained thereby, and melting at least a part of the heat-adhesive fiber, so that at least a part of the intersection of the constituent fibers is a heat-adhesive fiber The manufacturing method including heat-bonding by. Pressing process, the one or more cellulosic mixed fiber sheet, together with said another cellulosic fiber sheet or the long-fiber nonwoven fabric sheet optionally being carried out by passing between a pair of rolls, according to claim 10 Of manufacturing a non-woven fabric for a skin-impregnated skin-coated sheet. Prior to pressing and heat treatment, the one or more cellulosic mixed fiber sheet, together with said another cellulosic fiber sheet or the long-fiber nonwoven fabric sheet optionally further comprising subjecting the hydroentanglement, claim 10 Or 11. A method for producing a nonwoven fabric for a cosmetically impregnated skin coating sheet according to 11 . Pressing process, with respect to said other cellulosic fiber sheets or the long-fiber nonwoven fabric sheet by the one or more cellulosic mixed fiber sheet and when carried out by a wet state, any one of claims 10-12 The manufacturing method of the nonwoven fabric for cosmetics impregnation skin coating sheets as described in 1 .. The non-woven fabric for a cosmetic-impregnated skin-covering sheet according to any one of claims 1 to 9 , wherein the cosmetic is within a range of 150 parts by mass or more and 2500 parts by mass or less with respect to 100 parts by mass of the base material. Cosmetic impregnated skin-coated sheet impregnated at a certain rate.