JP5625027B2 - Cosmetic impregnated skin covering sheet and method for producing the same - Google Patents

Description

  The present invention is used by impregnating a cosmetic containing a moisturizing component, a cleansing component, an antiperspirant component, an aroma component, a whitening component, a blood circulation promoting component, an ultraviolet ray preventing component, a slimming component, etc. TECHNICAL FIELD The present invention relates to a cosmetic-impregnated skin-covering sheet and a manufacturing method thereof

  Cosmetics-impregnated skin coating sheets such as face masks impregnated with cosmetics are already widely used. As a sheet impregnated with cosmetics, a nonwoven fabric mainly composed of cotton (cotton) or rayon is generally used. Cotton or rayon is used for water-absorbing and suitable for impregnating cosmetics, natural fibers or fibers derived from natural materials, and is widely used for products that come into contact with the skin, such as underwear. This is due to the fact that there is a track record and that there is a firm feeling when it is held by hand and has a high-class feeling.

  The present applicant has also proposed a three-layered sheet using cotton, rayon, or the like as a sheet to be used by impregnating a liquid (Patent Documents 1 and 2). Moreover, the sheet | seat which impregnates cosmetics using fibers other than cotton is also proposed (patent document 3).

JP 2007-7062 A JP 2005-177176 A Japanese Patent No. 3804784

Nonwoven fabrics containing cotton or rayon and having cotton or rayon on the surface give a tactile feel when impregnated with cosmetics and applied to the skin. In order to investigate the cause, when the surface and cross section of the nonwoven fabric which consisted only of cotton or rayon and made the fibers entangled by the hydroentanglement treatment were enlarged and observed with a microscope, the following was observed.
-Many fiber ends exist on the surface of the nonwoven fabric.
-The fiber itself is not completely straight, but has a curved portion where the curved portion is acute.
These were thought to be the cause of the tingling tactile sensation.

  Despite the tendency to give such a tactile feel, sheets using cotton or rayon are often used in the market. Moreover, although the sheet | seat described in patent document 3 does not use cotton and rayon actively, many convex parts are provided, and the sheet | seat is closely_contact | adhered and covered like a face mask Not suitable for. The present invention has been made in view of these circumstances, and an object of the present invention is to provide a cosmetic-impregnated skin-covering sheet having a better tactile sensation and excellent adhesion to the skin.

In order to achieve the above object, the present invention provides:
A non-woven fabric comprising a three-dimensional crimped fiber having a three-dimensional crimp;
A cosmetic impregnated in the nonwoven fabric,
There is a three-dimensional crimp on the surface of the nonwoven fabric at least on the side in contact with the skin,
A cosmetic-impregnated skin-covering sheet is provided. The cosmetic-impregnated skin-covering sheet of the present invention (hereinafter sometimes simply referred to as “skin-covering sheet”) has fibers that exhibit steric crimps on its surface, so that the ends of the fibers are unlikely to appear on the surface. It becomes a thing of composition. Therefore, the skin coating sheet of this invention has a favorable tactile sensation.

  In the skin-covering sheet of the present invention, it is preferable that at least a part of the three-dimensional crimp has a shape that can project a closed curve. That is, it is preferable that at least a part of the observed solid crimps have a shape that allows the projection to draw a closed curve when the shapes are observed individually. When the fibers having such a shape with three-dimensional crimps are present on the sheet surface, the tactile sensation of the sheet becomes better.

  The shape of the three-dimensional crimp reflects its shadow, that is, it is grasped two-dimensionally by “projection”. The projection is obtained so that the shadow of the curved portion of the three-dimensional crimp is projected most greatly. `` Can draw a closed curve '' means that the beginning and end of the curved portion of the three-dimensional crimp are virtually extended, even if the curved portion of the three-dimensional crimp draws a closed curve, even if it does not draw a closed curve, It also means that the extension lines intersect.

  In the skin coating sheet of the present invention, it is preferable that the solid crimped fiber is contained in an amount of 25% by mass or more. The effect by including the fiber which has the said three-dimensional crimp as the ratio of a three-dimensional crimpable fiber is 25 mass% or more is exhibited more effectively.

  In the skin-coated sheet of the present invention, the three-dimensional crimped fiber is preferably formed by the occurrence of crimp in the latent crimpable fiber. For example, the latent crimpable fiber is likely to develop a three-dimensional crimp by heating, and the obtained three-dimensional crimp tends to have a closed curve as described above.

  The skin covering sheet of the present invention preferably has a shape that covers part or all of the face. That is, the skin coating sheet of the present invention is preferably used as a face mask. This is because a particularly good tactile sensation is required for the skin-coated sheet used on the face.

The present invention also provides a method for producing the skin-coated sheet of the present invention.
1) subjecting a fiber web containing latent crimpable fibers to a fiber entanglement treatment;
2) Provide a manufacturing method including heating a fiber web after fiber entanglement treatment to develop a three-dimensional crimp to obtain a nonwoven fabric, and 3) impregnating the nonwoven fabric with a cosmetic. According to this method, it is possible to easily produce a skin covering sheet having good tactile sensation and texture, in which fibers having a three-dimensional crimp are integrated by entanglement between fibers. The fiber entanglement process is preferably a hydroentanglement process. According to the hydroentanglement treatment, a non-woven fabric having a dense surface and a flat surface is produced, so that the tactile sensation of the skin covering sheet is improved.

  The method for producing a skin-coated sheet of the present invention may include performing press processing with a flat roll or a flat press plate after the above 2), that is, after steric crimping is expressed. By performing the press working, the flatness of the surface of the nonwoven fabric is improved, and a nonwoven fabric with a better tactile feel can be obtained.

  The skin-covering sheet of the present invention is characterized in that fibers having a three-dimensional crimp are arranged on the surface in contact with the skin. Due to this feature, the skin-coated sheet of the present invention has a soft tactile sensation and does not give a tingling sensation when in contact with the skin. In addition, the fiber having a three-dimensional crimp is generally a synthetic fiber and has a lower water absorption than cotton. Therefore, when the skin coating sheet of the present invention is impregnated with a cosmetic, the amount of liquid absorbed by the fiber itself is small. Get smaller. Therefore, the skin-coated sheet of the present invention easily forms a cosmetic film between the skin and the sheet during use, and this film prevents the fibers from directly contacting the skin to some extent, and makes the fibers feel tingy. Relax more. Therefore, the skin coating sheet of the present invention is particularly suitable for use on sensitive parts, particularly the face and neck muscles.

It is a projection view of an example of a preferable three-dimensional crimp. It is a projection figure of another example of a preferable three-dimensional crimp. It is a projection figure of another example of a preferable three-dimensional crimp. It is a schematic diagram which shows a three-dimensional crimp. It is a projection figure of an example of the three-dimensional crimp which does not form a closed curve. It is a side view of the jig | tool used in measuring a compressive stress and a recovery stress.

Embodiments of the present invention will be described below.
The skin-coated sheet of the present invention is
A non-woven fabric comprising a three-dimensional crimped fiber having a three-dimensional crimp;
A cosmetic impregnated in the nonwoven fabric,
There is a three-dimensional crimp on the surface of the nonwoven fabric that is in contact with the skin.

  The term “three-dimensional crimp” refers to the fact that the bent portion (usually a substantially acute angle) of a crimp imparted by a spiral curve or curl and a stuffing box type crimper is deformed and rounded. It is used to distinguish from the crimps (also referred to as “mechanical crimps”) given only by stuffing box type crimpers.

  In the present invention, as described above, the three-dimensional crimp preferably has a shape whose projection can draw a closed curve. Examples of such three-dimensional crimps are shown in FIGS. FIG. 1 is a projection of one three-dimensional crimp extracted from the fiber in which the spiral (coil-shaped) three-dimensional crimp shown in FIG. 4 is formed. The projection shown in the figure is obtained so that the bending portion is maximized, and is the projection in the direction indicated by the arrow X in FIG. The illustrated projection depicts a closed curve.

  FIG. 2 is another stereoscopic crimp projection. The illustrated three-dimensional crimp is not a spiral as shown in FIG. 1, and the end of the curved portion R1 forms another curved portion R2 and R3 (maximum or minimum of the curve) before forming the closed curve. Yes. In this case, assuming that the end of the bending portion R1 does not form another bending portion R2, a virtual extension line is drawn, and the virtual extension lines intersect to form a closed curve. It is considered a curved part that can be drawn. For example, it can be considered that a hairpin-shaped curved portion as shown in FIG. 3 can draw a closed curve. In either case, the virtual extension line extends in the tangential direction of an arbitrary point of the bending portion R1.

  The three-dimensional crimps shown in FIGS. 1 to 3 are strongly rounded (that is, strongly curled) and give a good tactile sensation to the skin. Moreover, when it has such a three-dimensional crimp, the edge part of a fiber will be hard to protrude toward the outer side from the nonwoven fabric surface. On the other hand, in the three-dimensional crimp that does not draw a closed curve, the projection is, for example, as shown in FIG. In the projection of the three-dimensional crimp shown in the figure, a closed curve is not formed even if a virtual extension line is drawn in the tangential direction of any point of the curve. Such three-dimensional crimps are less likely to give a good tactile sensation than those shown in FIGS.

  It is preferable that the three-dimensional crimp that the projection can draw a closed curve occupies at least a part of the total three-dimensional crimp. Specifically, the three-dimensional crimped fiber having at least one such three-dimensional crimp preferably occupies 10% by mass or more, more preferably 30% by mass or more of the nonwoven fabric. In particular, it is more preferable that the surface of the sheet contains 10% by mass or more of the three-dimensional crimped fiber.

  The steric crimp is preferably formed by the development of a latent crimp of a latent crimpable fiber that expresses the steric crimp, for example, by heating. Latent crimped fibers themselves are already known in the art. In the present invention, one or more kinds of known latent crimpable fibers are selected, and a part or all of the skin-covering sheet is constituted by the selected latent crimpable fibers. The latent crimpable fiber is, for example, a composite fiber composed of two resin components having different melting points and having a cross-sectional structure of a parallel type cross section or an eccentric core-sheath type cross section. Examples of the resin component combination include polyethylene terephthalate / modified polyester, polypropylene / ethylene-propylene copolymer, polypropylene / linear low density polyethylene (LLDPE), and polyester / polyamide.

  The latent crimpable fiber has a property (crimpability) that expresses a predetermined size and number of three-dimensional crimps according to the constituent resin and the cross-sectional shape. The crimping ability is appropriately selected according to the application site of the skin covering sheet. In the present invention, the latent crimpable fiber to be a three-dimensional crimped fiber has a number of crimps of 25 or more per inch, preferably measured in accordance with JIS 1015 when crimps are expressed in a free state. Preferably has a crimping ability to express 30 or more steric crimps, for example, it expresses 90 to 100 steric crimps when heated at 170 ° C. in a free state. is there.

  The fineness of the latent crimpable fiber is appropriately selected according to the application site of the skin covering sheet. In general, the smaller the fineness, the better the feel of the sheet. In general, the fineness of the latent crimpable fiber is preferably about 0.5 to 4.4 dtex, more preferably 0.9 to 3.3 dtex, and 0.9 to 2.5 dtex. Even more preferred. In the present invention, two or more kinds of latent crimpable fibers having different finenesses may be used.

  The latent crimpable fiber is preferably a staple fiber having a fiber length of 10 to 150 mm when the fibers are entangled by a hydroentanglement process or a needle punch process as described later. The fiber length of the staple fiber is more preferably 20 to 120 mm, and even more preferably 30 to 100 mm. When the fiber length of the staple fibers is less than 10 mm, the fibers are often dropped and the processability is also inferior. When the fiber length of the staple fiber exceeds 200 mm, the entanglement by the needle punching process or the hydroentanglement process is deteriorated. On the other hand, when the fiber length exceeds 200 mm, the processability tends to deteriorate.

  In the skin-coated sheet of the present invention, the three-dimensional crimped fibers having three-dimensional crimps are preferably contained in an amount of 25% by mass or more, more preferably 35% by mass or more, and even more preferably 50% by mass or more. preferable. Moreover, it is preferable that 50 mass% or more of solid crimp fiber is contained in the sheet | seat surface, and it is more preferable that 80 mass% or more is contained. When the proportion of the three-dimensional crimped fibers is less than 25% by mass, the number of three-dimensional crimps present on the sheet surface is reduced, and a good tactile sensation cannot be obtained. Moreover, when the ratio of the three-dimensional crimped fiber is small, the elasticity of the sheet is reduced, and the cushioning property in the thickness direction may be lowered. When the three-dimensional crimped fiber having a three-dimensional crimp is obtained by the expression of the crimp of the latent crimpable fiber, the preferred ratio listed here is the latent crimpable fiber before the expression of the crimp, Equal to the preferred proportion in the fiber web or sheet (eg nonwoven).

  The skin covering sheet of the present invention may contain fibers other than three-dimensional crimped fibers. For example, hydrophilic fibers may be included in order to increase the liquid absorption and / or liquid retention of the sheet. Hydrophilic fibers include natural fibers such as pulp, cotton, hemp, silk, and wool, regenerated fibers such as viscose rayon, copper ammonia rayon, and solvent-spun cellulose fibers, and synthetic fibers that have been subjected to a hydrophilic treatment. Etc.

  As will be described later, when the fibers are entangled by hydroentanglement treatment, the hydrophilic fibers are preferably viscose rayon or pulp from the viewpoint of entanglement. Viscose rayon is particularly preferably used because it can be used in the form of staple fibers and, therefore, the amount of fallen fibers can be reduced during use of the nonwoven fabric.

  Alternatively, the fibers other than the three-dimensional crimped fibers may be synthetic fibers. The synthetic fibers are selected from polyolefin resins such as polypropylene, polyethylene, polybutene-1 and ethylene-propylene copolymers, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyamide resins such as nylon 6 and nylon 66. It may be a single fiber or a composite fiber composed of one or a plurality of resins.

  When using a hydrophilic fiber or a synthetic fiber, it is preferable that the fineness is 0.5-6.6 dtex, for example. The fiber length is preferably 10 to 150 mm, more preferably 20 to 120 mm, and even more preferably 30 to 100 mm when the fibers are entangled by needle punching or hydroentanglement. .

  The skin-coated sheet of the present invention may be a single-layered sheet composed of only three-dimensional crimped fibers or other fibers, or a layer composed of only three-dimensional crimped fibers or these and other fibers. And a sheet having a laminated structure of layers made of other fibers. With a single-layer structure, there are three-dimensional crimped fibers that have three-dimensional crimps inside the sheet, which increases the bulkiness of the sheet, increases its elasticity, and provides a firm feel when held by hand. And cushioning is high.

  When the skin-coated sheet of the present invention has a laminated structure, the sheet is a layer composed of only three-dimensional crimped fibers or this and other fibers (hereinafter, this layer is also referred to as “three-dimensional crimped fiber layer”). It is arranged on the surface that touches. The skin covering sheet having a laminated structure may have a two-layer structure including a three-dimensional crimped fiber layer and another fiber layer, or a three-layer structure in which another fiber layer is located between the two three-dimensional crimped fiber layers. It may be. The other fiber layer may be a fiber layer containing hydrophilic fibers or consisting only of hydrophilic fibers.

  The skin-coated sheet of the present invention maintains the sheet shape by integrating the fibers by entanglement, regardless of whether the skin-coated sheet has a single-layer structure or a laminated structure. The entanglement between the fibers may be, for example, by needle punching or hydroentanglement, preferably the latter. This is because the sheet in which the fibers are entangled by the hydroentanglement process is dense, and the surface thereof is flatter and smoother.

The skin-coated sheet of the present invention as a whole preferably has a basis weight of 30 to 250 g / m ² , more preferably 40 to 120 g / m ² . If the basis weight is too small, the absolute amount of liquid that can be impregnated will be small, and the feeling when held by hand will not be firm. In addition, if the basis weight is small, the elasticity (especially the cushioning property in the thickness direction) becomes small, so that a good wearing comfort may not be obtained when it is applied to the skin. Further, when the basis weight is small, the sheet manufacturing processability tends to be lowered and / or the texture tends to be lowered. If the basis weight is too large, it becomes too thick, making it difficult to handle, and increasing the cost.

When the skin-coated sheet of the present invention has a laminated structure, the overall basis weight is within the above range, the basis weight of the three-dimensional crimped fiber layer is 10 to 150 g / m ² , and the basis weight of the other fiber layers is 10 It is preferably ˜150 g / m ² . In the laminated structure, if the basis weight of the three-dimensional crimped fiber layer is small, the elasticity (especially cushioning property in the thickness direction) of the sheet becomes small, and a good tactile sensation may not be obtained. If the basis weight of the three-dimensional crimp layer is too large, a function (for example, a cosmetic holding function when a hydrophilic fiber layer is provided) by providing another fiber layer may not be sufficiently obtained.

Next, an example of the manufacturing method of the skin coating sheet of this invention is demonstrated. The skin-coated sheet of the present invention is
1) subjecting a fiber web containing latent crimpable fibers to a fiber entanglement treatment;
2) The fiber web after the fiber entanglement treatment is heated to develop a three-dimensional crimp to obtain a nonwoven fabric, and 3) it can be produced by a production method including impregnating the nonwoven fabric with a cosmetic.

  The form of the fiber web containing latent crimpable fibers is not particularly limited. For example, the fiber web may be in any form selected from a card web such as a parallel web, a cross web, a Chris cross web, a semi-random web and a random web, an air lay web, a wet paper web, and a spunbond web. Also good. The fiber web is preferably a card web in consideration of entanglement when the fibers are entangled by hydroentanglement treatment. Further, when the fibers are entangled with each other by needle punching, it is preferable that the fiber web is a cross web or a cross cloth web in consideration of the balance between the basis weight and the physical properties of the nonwoven fabric obtained.

  Next, the fiber web is subjected to an entanglement process. In the production of the skin-coated sheet of the present invention, the entanglement process is preferably a hydroentanglement process. This is because according to the hydroentanglement treatment, the fibers are entangled densely and a uniform and flat sheet can be obtained.

The hydroentanglement process is carried out by placing a laminate on a support and injecting a columnar water stream. Those support surface of the nonwoven fabric is flat, and so does not have an uneven, open area per one does not have an opening of more than 0.2 mm ^2, also not projecting or pattern is formed It is preferable that For example, the support is preferably an 80-100 mesh plain weave support.

  In the hydroentanglement process, a water flow having a water pressure of 1 MPa or more and 15 MPa or less is applied to the front and back surfaces of the laminate from nozzles provided with orifices having a hole diameter of 0.05 mm or more and 0.5 mm or less at intervals of 0.3 mm or more and 1.5 mm or less. You may implement by injecting 1-5 times at a time. The water pressure is preferably 1 MPa or more and 10 MPa or less, and more preferably 1 MPa or more and 7 MPa or less.

Instead of or together with the water entangling method, the needle punch method may be adopted as the entangling method. When the needle punch method is used, a bulkier nonwoven fabric can be obtained. The needle punching process can be performed using a normal needle punching machine. The needle punching process may be performed by, for example, using a 36th to 42nd needle, setting the needle depth to 3 to 20 mm, and driving at a density of 30 to 500 needles / cm ² .

Next, the fiber web after the entanglement treatment is heat-treated to develop steric crimps in the latent crimpable fibers. The heat treatment is preferably carried out by overfeeding (overfeeding) the fiber web (or non-woven fabric) in the machine direction (MD direction) so that crimps are sufficiently developed. That is, it is preferable to set the web conveyance speed of the heat treatment machine smaller than the speed of the web (or non-woven fabric) fed to the heat treatment machine. Specifically, the overfeed rate represented by the following formula is preferably set to 30 to 200%.

  The heat treatment may also be performed with controlled lateral (CD direction) dimensions. For example, the heat treatment may be performed to ensure that the fiber web contracts in the transverse direction so that the crimps are sufficiently developed in the latent crimped fibers. Specifically, when the fiber web is heat-treated by a method of blowing hot air, a pin tenter is used so that tension is not excessively applied when the transverse dimension of the fiber web is reduced by the heat treatment. The transverse dimension of the web may be gradually reduced while passing through the heat treatment machine.

  The heat treatment temperature and the heat treatment time are selected according to the resin constituting the latent crimpable fiber so that the three-dimensional crimp is developed. For example, when the latent crimpable fiber is a composite fiber composed of a combination of polyethylene terephthalate / modified polyester (melting point 170 ° C. or higher), the heat treatment temperature is preferably 120 to 145 ° C., and the heat treatment time is 10 to 60 seconds. It is preferable that

  The heat treatment is preferably performed by a hot air blowing method (air-through method). According to this method, the three-dimensional crimp is not easily crushed. The heat treatment may be performed by a method using a hot roll.

  When the entanglement process is a hydroentanglement process, a heat treatment for removing or reducing moisture may be performed first before the heat treatment for causing steric crimps. Such heat treatment is carried out at a heat treatment temperature of about 50 to 100 ° C. using, for example, a drum-type dryer.

  After expressing crimps, the nonwoven fabric may be pressed with a flat roll or a flat press plate as necessary. As a result, a sheet having a flatter surface and a smooth feel can be obtained. The pressing is performed by selecting a pressure and a temperature that do not collapse the developed three-dimensional crimp. For example, when the latent crimpable fiber is a composite fiber made of a combination of polyethylene terephthalate / modified polyester (melting point: 170 ° C. or higher), the pressing temperature is 50 to 100 ° C., the pressing pressure is larger than 0 and about 10 MPa or lower. It is preferable.

  The non-woven fabric thus obtained is impregnated with a cosmetic that is usually liquid to obtain the skin-coated sheet of the present invention. The cosmetic can be impregnated into the sheet by an ordinary method, and can be impregnated by, for example, a dipping method or a coating impregnation method using a die coater or a reverse coater.

  The skin covering sheet is formed by impregnating the liquid cosmetic material in the range of 100 parts by mass to 1500 parts by mass, preferably 400 parts by mass to 700 parts by mass with respect to 100 parts by mass of the nonwoven fabric before impregnation with the cosmetic. By setting the amount of the cosmetic within this range, it is possible to supply a sufficient amount of the active ingredient to the skin and avoid inconvenience during use such as dripping. The optimal amount of cosmetic is appropriately determined according to the properties of the coated sheet, particularly the water absorption. In a preferred embodiment, the amount of the cosmetic is adjusted so that there is a cosmetic that is equal to or greater than the saturation amount of the coated sheet during the set use time.

  The cosmetic preferably contains, for example, a moisturizing component, a cleansing component, an antiperspirant component, an aroma component, a whitening component, a blood circulation promoting component, an ultraviolet ray preventing component, or a slimming component as an active ingredient. The active ingredient of the cosmetic is not limited thereto, and may include any ingredient that is expected to exhibit a specific action on the skin.

  The skin coating sheet of the present invention is preferably a face mask that covers a human face. The face mask is manufactured by processing a non-woven fabric before impregnating the cosmetic into a shape suitable for covering the face. In the face mask, 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 provided in 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. Such a set of two or more sheets facilitates the task of covering the entire face with a sheet.

  The skin covering sheet of the present invention may be used to cover a part other than the face. For example, the skin coating sheet of the present invention impregnated with a liquid cosmetic containing a moisturizing component may be used by sticking to the neck, elbow or heel. Alternatively, the skin coating sheet of the present invention impregnated with a liquid cosmetic containing a slimming component may be used by sticking to the abdomen or thigh.

  Since the skin-coated sheet of the present invention includes a three-dimensional crimped fiber having a three-dimensional crimp, the skin-coated sheet has a good tactile sensation, is bulky, and feels firm (hand-held) and volume when held by hand. give. In addition, since the three-dimensional crimp acts as a spring and gives the sheet an appropriate elasticity, the skin-coated sheet of the present invention has a good cushioning property in the thickness direction, and has a recovery stress (the sheet is thick). After compressing in the direction, the stress generated when recovering is high. Such a skin-covered sheet is considered to be difficult to give a heavy wearing feeling that clings to the skin because it is easy to recover when it is released after being applied to the skin while pressing the sheet by hand.

  Hand feeling and volume feeling, which are the characteristics of the skin-coated sheet of the present invention, can be estimated by measuring the thickness, density, compressive stress, and recovery stress of the nonwoven fabric before impregnating the cosmetic. The skin coating sheet of the present invention preferably has a compressive stress such that the stress is 4N or less when the displacement is 8 mm. Moreover, when the displacement is 8 mm, the skin-coated sheet of the present invention preferably has a recovery stress such that the stress is preferably 1.2 N or more, more preferably 2 N or more. It can be said that a good hand feeling is brought about when both the compressive stress and the recovery stress of the nonwoven fabric before impregnating the cosmetic are within this numerical range.

  When the three-dimensional crimp in the skin-coated sheet of the present invention is formed by developing a crimp of a latent crimpable fiber, the sheet is densified in the manufacturing process. Therefore, the obtained skin covering sheet is uniform and less dense, which also ensures good tactile sensation. In addition, since the fibers shrink in both the machine direction and the transverse direction in the process of developing the crimps of the fibers, the fiber arrangement in the sheet is relatively uniform (that is, in one direction of fiber orientation). Is less biased). When the fiber arrangement is uniform, the skin covering sheet has a small difference in softness due to a difference in direction, and is particularly easy to fit to a face having irregularities.

  This feature, that is, because it is composed of three-dimensional crimped fibers, the fibers are evenly arranged, the sheet is soft, and it is easy to fit the skin, the non-woven handle handle before impregnation with cosmetics. Expressed by meter value. In the skin coating sheet of the present invention, the handle ohm value is preferably 2 to 15 g in the longitudinal direction (machine direction) and 2 to 10 g in the lateral direction. More preferably, the value of the handle ohmmeter is 3 to 10 g in the vertical direction and 2 to 9 g in the horizontal direction. Further, the ratio of the vertical direction / horizontal direction (vertical aspect ratio) is preferably 0.5-2. Because the value of the handle ohmmeter of the non-woven fabric before impregnating the cosmetic is within this numerical range, the non-woven fabric of the present invention has excellent flexibility and good balance in length and width. It can be said that the fit is high.

  The skin coating sheet of the present invention will be described in detail with reference to examples. The thickness, tensile strength, tensile elongation, 10% and 50% stress, compressive stress and recovery stress, and bending resistance of the nonwoven fabric before impregnation with the cosmetic were measured or evaluated as follows.

[thickness]
Using a thickness measuring machine (trade name: THICKNESS GAUGE model CR-60A, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.), measurement was performed with a load of 2.94 cN per 1 cm ^{2 of} the sample.

[Tensile strength and tensile 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 applied to the test and the load value and elongation rate at the time of cutting were measured, and it was considered as tensile strength and tensile elongation, respectively. Tensile tests were conducted in each of the machine direction (MD direction) and the transverse direction (CD direction) of the sheet.

[Compressive stress and recovery stress]
Samples were cut into squares so that the machine and lateral dimensions were 10 cm × 10 cm. The cut samples were stacked until the thickness was 20 mm. A jig having a circular pressing surface was attached to the head of a constant-speed tension type tensile tester and brought into contact with the center portion of the stacked samples. Then, it was lowered to 10 mm at a head speed of 20 mm / min. At that time, the compressive stress of the sample was measured every time the head dropped 1 mm (that is, every 1 mm of compression). Then, the head speed was increased at a rate of 20 mm / min, and the recovery stress of the sample was measured. FIG. 6 schematically shows the side surface of the jig. The jig had a cylindrical shape having a truncated cone shape, and had a pressing surface with a diameter r of 7 mm, a height h of 60 mm, an overall diameter s of 8 mm, and a truncated cone with a height t of 1 mm.

[Bending softness]
Measurement was performed using a handle ohmmeter (model HOM-200, manufactured by Daiei Kagaku Seiki Seisakusho). More specifically, a test piece having a machine direction × lateral direction of 20 cm × 17.5 cm is set on a slit having a width of 10 mm so as to be perpendicular to the slit, and 6.7 cm (test width) from the side of the test piece. Was pushed by 8 mm with a penetrator blade, and the resistance value at this time was evaluated as the bending resistance. The bending resistance was measured for each sample in the machine direction and the transverse direction. The bending resistance shown in Table 1 below is an average value of bending resistance measured for each of the front and back surfaces.

[Sample 1]
An eccentric core-sheath type composite fiber (trade name T-81, manufactured by Unitika Ltd.) whose core / sheath is polyethylene terephthalate (melting point 250 ° C.) / Modified polyester (melting point 230 ° C.) was prepared as the latent crimpable fiber. . In this example, a fineness of 2.2 dtex and a fiber length of 44 mm were used. This latent crimpable fiber develops 90-100 steric crimps whose projections are as shown in FIGS. 1-3 when heat treated at 170 ° C. for 15 minutes in a free state. It was something to do.

A semi-random card web having a basis weight of 40 g / m ² was produced using only the latent crimpable fiber and using a semi-random card machine. Next, a columnar water flow with a water pressure of 2.5 MPa was jetted twice on one surface of the web using a nozzle having orifices with a pore diameter of 0.13 mm provided at intervals of 1.0 mm, and then the pore diameter on the other surface. Using a nozzle in which 0.13 mm orifices were provided at intervals of 1.0 mm, a columnar water flow having a water pressure of 2.5 MPa was jetted twice to entangle the fibers. The fiber web was then dried using a drum dryer set at 60 ° C.

Next, the fiber web after hydroentanglement was heat-treated using an air-through heat treatment machine. During the heat treatment, the fiber web was conveyed using a pin tenter so that the width at the outlet after heat treatment was about 87% of the width at the inlet of the heat treatment machine. The heat treatment temperature was 140 ° C. and the heat treatment time was 30 seconds. The overfeed rate was 85.4%. By this heat treatment, the three-dimensional crimp of the latent crimpable fiber was expressed to obtain a non-woven fabric for a skin covering sheet. The basis weight of the obtained nonwoven fabric was 80.9 g / m ² , and the area shrunk by about 50% by the heat treatment.

[Sample 2]
A semi-random card web having a basis weight of about 58 g / m ² was produced using only cotton. Next, a columnar water flow having a water pressure of 3 MPa was sprayed twice on one surface of the web using a nozzle having orifices with a pore diameter of 0.13 mm provided at 1.0 mm intervals. Using a nozzle in which 13 mm orifices were provided at intervals of 1.0 mm, a columnar water flow having a water pressure of 3 MPa was jetted twice to entangle the fibers. Then, using a drum dryer set at 140 ° C., the fiber web was dried to obtain a nonwoven fabric for a skin-covering sheet.

[Sample 3]
Except that a semi-random card web having a weight per unit area of 45 g / m ² was prepared using the latent crimpable fiber used for the preparation of Sample 1, the procedure was the same as the procedure adopted when preparing Sample 1. A nonwoven fabric was prepared. The obtained nonwoven fabric had a basis weight after heat treatment of 88.0 g / m ^2, and the area contracted by 49% by the heat treatment.

[Sample 4]
Except that a semi-random card web having a basis weight of 50 g / m ² was produced using the latently crimpable fiber used for the production of Sample 1, the procedure was the same as that adopted when producing Sample 1. A nonwoven fabric was prepared. The obtained nonwoven fabric had a basis weight of 99.0 g / m ² after heat treatment, and the area contracted by 49% by the heat treatment.

[Sample 5]
As a latent crimpable fiber, an eccentric core-sheath type composite fiber (trade name CPP, Daiwabo) whose core / sheath is polypropylene (melting point 165 ° C.) / Ethylene-propylene copolymer (melting point 140 ° C., ethylene content 3 mass%). Polytech Co., Ltd.) was prepared. In this example, a fineness of 2.2 dtex and a fiber length of 51 mm were used. This latent crimpable fiber develops 90-100 steric crimps whose projections are as shown in FIGS. 1-3 when heat treated at 170 ° C. for 15 minutes in a free state. It was something to do.

The semi-random card web having a basis weight of about 70 g / m ² was prepared by mixing 80% by mass of the latent crimpable fiber and 20% by mass of the polypropylene fiber and using a semi-random card machine. This was subjected to a needle punching process to produce a nonwoven fabric for a skin coating sheet. The needle punching process was performed at a density of 100 needles / cm ² with a needle depth of 5 mm using a 40th needle. Subsequently, it heat-processed using the air through heat processing machine. During the heat treatment, the fiber web was conveyed using a pin tenter so that the width at the outlet after the heat treatment was about 10% of the width at the inlet of the heat treatment machine. By this heat treatment, the three-dimensional crimp of the latent crimpable fiber was expressed to obtain a non-woven fabric for a skin covering sheet. The basis weight of the obtained nonwoven fabric was 100.2 g / m ² .

[Sample 6]
The latent crimpable fiber used for the preparation of Sample 1 and an 8-split composite fiber composed of a polyethylene terephthalate / high-density polyethylene combination having a fineness of 2.2 dtex and a fiber length of 51 mm were used. ^Two parallel card webs having a basis weight of about 20 g / m ² were prepared as a first fiber web, with the mixing ratio (mass ratio) of both being 85:15 (latent crimpable fiber: split-type conjugate fiber). As hydrophilic fibers, rayon (trade name Corona, manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.7 dtex and a fiber length of 40 mm was prepared. Using only this rayon, a parallel card web having a basis weight of about 30 g / m ² was produced as a second fiber web.

  The first fiber web was disposed on both sides of the second fiber web to form a three-layer laminate, and this was subjected to hydroentanglement treatment. In the hydroentanglement treatment, a columnar water flow having a water pressure of 3 MPa is sprayed once on one surface of the laminate using a nozzle having an orifice having a hole diameter of 0.1 mm at intervals of 0.6 mm, and the water pressure is 3 MPa on the other surface. A columnar water stream was jetted once. As a result, ultrafine fibers obtained by dividing the split type composite fiber were formed, and the fibers were entangled.

  Next, the laminate was heat-treated using an air-through heat treatment machine. The heat treatment temperature was 140 ° C. and the heat treatment time was 12 seconds. By heat treatment, the three-dimensional crimp was expressed in the latent crimpable fiber, and the fibers were thermally bonded with high-density polyethylene to obtain a laminated nonwoven fabric.

[Sample 7]
70% by mass of latent crimpable fibers used for the preparation of Sample 1, rayon having a fineness of 1.7 dtex and a fiber length of 40 mm were mixed to prepare a parallel card web having a basis weight of 35 g / m ² . Next, using a nozzle in which orifices having a hole diameter of 0.1 mm were provided at intervals of 0.6 mm on both surfaces of the web, a columnar water flow having a water pressure of 2.5 MPa was sprayed once to entangle the fibers.

Next, the fiber web after hydroentanglement was heat-treated using a pin tenter heat treatment machine. During the heat treatment, the fiber web was conveyed using a pin tenter so that the width at the outlet after the heat treatment was about 90% of the width at the inlet of the heat treatment machine. The heat treatment temperature was 140 ° C. and the heat treatment time was 12 seconds. The overfeed rate was 30%. By this heat treatment, the three-dimensional crimp of the latent crimpable fiber was expressed to obtain a non-woven fabric for a skin covering sheet. The basis weight of the obtained nonwoven fabric was 55.0 g / m ² , and the area contracted by 36% by heat treatment.

  Table 1 shows the basis weight, thickness, tensile strength, tensile elongation, and bending resistance of the nonwoven fabric obtained in Samples 1 and 2 and compression of the nonwoven fabric obtained in Samples 1 and 2 The stress and recovery stress are shown in Table 2.

  Samples 1 and 3 to 7 have a stress of at least 10% lower than that of sample 2 in both the vertical direction (machine direction) and the horizontal direction, and 50% stress (especially in the vertical direction) is generally small, with a slight force. It was easy to deform and flexible. Sample 1 was considered to have a difference in bending resistance (only sample 1) smaller than sample 2 compared to sample 2, and the fiber direction was not biased in one direction. Sample 1 also had a greater recovery stress when compared with sample 2 when the amount of compression was large (particularly 8 mm and 9 mm). This indicates that the elasticity of the sample 1 in the thickness direction is large and the cushioning property is high.

  Furthermore, the nonwoven fabrics of Samples 1 to 7 were cut according to the shape of the human face, and a commercial cosmetic was impregnated with 500 parts by mass of 100 parts by mass of the nonwoven fabric to prepare a face mask. When the prepared face mask was attached to the monitor, it was evaluated that sample 1 and samples 3 to 7 had no tingling sensation and had a good tactile sensation, and sample 2 had a tingling sensation. It was evaluated. Moreover, since the sample 1 has a small elongation stress, it was able to be attached to the face more smoothly than the sample 2 when it was attached to the face in a tensile manner.

  The skin-coated sheet of the present invention is useful as a face mask for wearing on the face, a sheet for allowing the active ingredients of cosmetics to penetrate into the neck and thighs, and the like.

Claims (11)

A non-woven fabric comprising a three-dimensional crimped fiber having a three-dimensional crimp;
Including a liquid cosmetic impregnated in the nonwoven fabric,
The nonwoven fabric has a single layer structure composed of fibers having a fiber length of 10 to 150 mm , and the basis weight is 40 to 120 g / m ² .
There is a three-dimensional crimp on the surface of the nonwoven fabric on the side that comes into contact with the skin,
At least some of the three-dimensional crimps have a shape whose projection can draw a closed curve,
The liquid cosmetic is impregnated in an amount of 400 parts by mass or more and 1500 parts by mass or less with respect to 100 parts by mass of the nonwoven fabric before impregnation with the cosmetic,
The handle ohm value of the nonwoven fabric before impregnation with the cosmetic is 2 to 15 g in the vertical direction, 2 to 10 g in the horizontal direction, and the ratio of the vertical / horizontal direction of the handle ohm value is 0.5 to 2. is there,
Face mask . The face mask according to claim 1, wherein the nonwoven fabric has a basis weight of 40 to 99 g / m ² . The face mask according to claim 1 or 2, wherein the fibers are entangled and integrated by hydroentanglement treatment in the nonwoven fabric . The face mask according to any one of claims 1 to 3, comprising 25% by mass or more of three-dimensional crimped fibers. The face mask according to any one of claims 1 to 4, wherein the three-dimensional crimp is formed by the occurrence of crimp in the latent crimpable fiber. The face mask according to claim 5, which has a crimping ability such that the number of crimps is 25 or more per inch when the crimps are developed in a state in which the latent crimpable fibers are free. The face mask according to any one of claims 1 to 6, wherein the compressive stress of the nonwoven fabric before impregnating the cosmetic is 4N or less when the displacement is 8 mm. The face mask according to any one of claims 1 to 6, wherein the recovery stress of the nonwoven fabric before impregnating the cosmetic is 1.2 N or more when the displacement is 8 mm. A method of manufacturing the face mask according to claim 1,
1) subjecting a fiber web composed of fibers having a fiber length of 10 to 150 mm including latent crimpable fibers to fiber entanglement treatment;
2) Heating the fiber web after fiber entanglement treatment to express three-dimensional crimps to obtain a nonwoven fabric, and 3) 400 parts by mass or more and 1500 parts by mass of liquid cosmetics per 100 parts by mass of the nonwoven fabric. Impregnating in an amount less than or equal to parts by weight,
The fiber entanglement process is a hydroentanglement process, or a needle punch process in which the needle depth is 3 to 20 mm and the needle is driven at a density of 30 to 500 / cm ² using a 36-42 needle.
Manufacturing method of face mask . The method for manufacturing a face mask according to claim 9 , wherein the heat treatment in 2) includes feeding the fiber web to a heat treatment machine while overfeeding at an overfeed rate of 30 to 200%. The manufacturing method of the face mask of Claim 9 or 10 including giving a press work with a flat roll or a flat press board after 2).

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