KR102449531B1 - Wiping sheet - Google Patents

Abstract

An object of the present invention is to provide a wiping sheet that has a good surface side feel and can exhibit wiping properties on the front and back sides.
A wiping sheet having a surface layer (2) mainly composed of long fibers (4) having hygroscopicity having an average fiber diameter of 10 µm or less, and a back surface layer (3) mainly composed of short fibers (5) having an average fiber diameter of more than 10 µm As (1), in the surface layer 2, the long fibers 4 form irregular arcs and uniformly spread in a mesh shape, and in the back surface layer 3, a plurality of open holes arranged in the first direction (X). 80 is formed, and the long fibers 4 span at least a portion of the open holes 80 .

Description

wiping sheet {WIPING SHEET}

The present disclosure relates to a wiping sheet, in particular, a wiping sheet capable of wiping in a dry state and in a wet state.

Conventionally, a wiping sheet using ultrafine fibers (microfibers) having an average fiber diameter of 10 µm or less is known. For example, Patent Document 1 discloses a wiping sheet having a surface layer comprising ultrafine fibers formed by splitting split composite fibers and a back layer comprising hydrophilic fibers having an average fiber diameter larger than that of the ultrafine fibers.

Patent Document 1: Japanese Patent No. 3944526

When the wiping sheet described above is used as a sheet for wiping off facial sebum or makeup in a dry or wet state, the surface layer formed of the microfine fibers directly touches the user's skin, so that the microfine fibers enter the pores and sebum. It is said that it has excellent wiping properties because it can scrape off makeup dirt, and has a low irritation to the skin and has an excellent feel.

However, since the surface of the split composite fiber of the surface layer does not draw a smooth curve when viewed in a cross section in the radial direction, there is a risk of irritation to the skin when it comes into contact with sensitive skin. In addition, since the back surface formed of the back surface layer made of hydrophilic fibers is smooth, it is difficult to function as a wiping surface. Therefore, when the user selects the back surface of the wiping sheet as the wiping surface, the cosmetic powder or dust adhering to the face cannot be sufficiently captured.

It is an object of the present invention to provide a wiping sheet that has a good surface feel and can exhibit wiping properties on both front and back surfaces.

In order to achieve the above object, the present invention provides a surface layer mainly composed of long fibers having hygroscopicity having an average fiber diameter of 10 μm or less, in a first direction and a second direction intersecting it, and an average fiber diameter of more than 10 μm, provided that It relates to a wiping sheet having a backing layer mainly composed of fibers.

In the wiping sheet according to the present invention, in the surface layer, the long fibers are irregularly arced and uniformly spread in a mesh shape, and a plurality of open holes arranged in the first direction are formed in the back surface layer, , the long fiber spans at least a portion of the open hole.

According to the wiping sheet according to one or more embodiments of the present invention, in the surface layer, long fibers having an average fiber diameter of 10 μm or less are uniformly arced and uniformly spread in a mesh shape, so that the feel is good and the brushing effect is excellent. It is excellent, and when a liquid such as a cosmetic liquid is supplied, a uniform liquid film is formed and the skin can be uniformly wetted. In addition, since the plurality of open holes arranged in the first direction are formed in the back layer, cosmetic powder or fine dust can be replenished when the skin is rubbed.

The drawings show specific embodiments of the wiping sheet according to the present invention and include optional and preferred embodiments, as well as essential features of the invention.
1 is a perspective view of a wiping sheet according to the present invention.
2 is a partially enlarged plan view of a surface layer.
FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1 .
FIG. 4 is a partially enlarged view of a region surrounded by a dashed-dotted line IV in FIG. 3 .
Fig. 5 is a side view schematically showing a major part in the manufacturing process of the wiping sheet.
6 is a perspective view of a cosmetic pad in which a wiping sheet according to the present invention is used.
7 is a cross-sectional view taken along line VII-VII of FIG. 6 .
Fig. 8 (a) is a perspective view of a container for refilling the wet sheet, and (b) is a partially enlarged side view of the wet sheet laminate in the container.

The following embodiment relates to the wiping sheet 1 shown in Figs. 1 to 8 which is an embodiment of the present invention, and includes not only an essential configuration of the invention, but also an optional and preferable configuration.

1 and 2, a wiping sheet 1 according to the present invention has a first direction X and a second direction Y intersecting it, a front surface 1a and a rear surface 1b; It includes a surface layer (2) and a back surface layer (3) laminated to each other. The surface layer 2 is formed of a nonwoven fabric mainly composed of melt blown fibers that are hygroscopic long fibers 4 having an average fiber diameter of 10 µm or less. As the long fibers 4, for example, polyamide fibers such as nylon 6 and nylon 66, acrylic fibers, or hydrophobic fibers treated with hydrophilicity can be used. The content of the long fibers 4 in the surface layer 2 is about 60 mass% or more, preferably about 95 mass% or more, and 100 mass% in the present embodiment.

The back layer 3 includes, for example, short fibers 5 such as cellulose-based staple fibers such as natural fibers having absorbency such as rayon staples, or other hygroscopic regenerated fibers or pulp fibers, or short fibers of thermoplastic synthetic fibers. do. The content rate of the short fibers in the back layer 3 is about 50 to 100% by mass of the cellulose-based staple fibers and about 0 to 50% by mass of the short fibers of the thermoplastic synthetic fibers. As the thermoplastic synthetic fibers, for example, synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate, mixtures of synthetic fibers, or composite fibers using two or more types of these synthetic resins can be used. In addition, as the composite fiber, a sheath core type or an eccentric type composed of two synthetic fiber components having different melting points can be used, and by using this, crimping is expressed in the short fibers 5 and the back layer 3 having elasticity and bulkiness. ) can also be formed.

The fiber length of the long fibers 4 as referred to herein is in the range of 30 to 200 mm, and the fiber length of the short fibers 5 as referred to herein is smaller than that. The average fiber diameter (diameter of short fibers) of the long fibers 4 is smaller than the average fiber diameter of the short fibers 5 of the back layer 3, specifically, the average fiber diameter of the long fibers 4 is Preferably it is 10 micrometers or less, More preferably, it is about 5 micrometers or less, and the average fiber diameter of the single fiber 5 is about 10 micrometers or more, More preferably, it is 10-20 micrometers. In addition, the long fibers 4 have lower hygroscopicity than the short fibers 5. In the present specification, the long fibers 4 are ultrafine fibers and/or low hygroscopic fibers, and the short fibers 5 are highly hygroscopic fibers or absorbent fibers. Also called

3 and 4, the thickness dimension t1 of the wiping sheet 1 is preferably about 0.2 to 0.3 mm, and the mass per unit area of the wiping sheet 1 is about 25 to 40 g/ It is preferably in the range of m2. In addition, the specific volume of the wiping sheet 1 is about 145 m 3 /kg in this embodiment. The thickness dimension t2 of the surface layer 2 is smaller than the thickness dimension t3 of the back surface layer 3, and the thickness dimension t2 of the surface layer 2 is 20% of the thickness dimension t3 of the back surface layer 3 It is preferably -60% size. Specifically, the thickness dimension t2 of the surface layer 2 is about 0.02-0.15 mm, and the thickness dimension t3 of the back surface layer 3 is about 0.1-0.25 mm. When the thickness dimension t2 of the surface layer 2 is less than 0.02 mm, the wiping portion of the wiping sheet 1 may become too thin and the wiping property may decrease, while the thickness dimension t2 exceeds 0.15 mm. In the case of , since the thickness dimension t3 of the back layer 3 is relatively small, the bending rigidity of the wiping sheet 1 is lowered, and the wiping sheet 1 becomes weak in elasticity, which may cause wrinkles during use. there is

<Measuring method of thickness dimension>

The thickness dimension t1 of the wiping sheet 1 is in a state where a load of 3.0 gf/cm 2 is applied to the wiping sheet 1, and a thickness gauge (manufactured by Daie Kagaku Seiki Seisakusho Co., Ltd., UF-60) ) to measure. For the thickness dimensions (t2, t3) of the surface layer 2 and the back surface layer 3, the cross-section of the wiping sheet 1 was observed using a microscope (Real Surface View Microscope VE-7800, manufactured by Kiens Co., Ltd.). to measure The respective densities of the wiping sheet 1, the surface layer 2 and the back surface layer 3 are based on the density (g/cm 3 )=mass per unit area (g/m 2 )/thickness dimension (mm)×10 ^-3 , and the specific volume (m3/kg) of the wiping sheet 1 is calculated as the reciprocal of the density (g/cm3)×10 ³ .

The mass per unit area of the surface layer 2 is in the range of 5 to 30 g/m 2 , and more preferably 5 to 15 g/m 2 . The density of the surface layer 2 is preferably about 0.05 to 0.2 g/cm 3 , and in this embodiment about 0.11 g/cm 3 . When the mass per unit area of the surface layer 2 is about 10 g/m 2 or less, the mass per unit area of the back surface layer 3 is preferably about 25 g/m 2 or more. The mass per unit area of the back surface layer 3 is about 10-35 g/m<2>, and it is more preferable that it is about 15-30 g/m<2>. It is preferable that the density of the back surface layer 3 is about 0.08-0.2 g/cm<3>.

The wiping sheet 1 of the present invention can be used in either dry or wet state, and is a wiping sheet for wiping off dirt such as sebum and makeup adhering to the skin, or a covering for covering the batting of a cosmetic pad. It is suitably used as a sheet|seat and a wet sheet (wet tissue) impregnated with a cleansing agent. When the wiping sheet 1 is used in a wet state, it can be impregnated with water, wetting agents such as ethylene glycol, drugs such as alcohols and antibacterial agents, perfumes, and other components according to a known method. In addition, as in the present embodiment, the wiping sheet 1 is used as wipes for objects (including dry) impregnated with drugs such as antibacterial agents and antibacterial agents as in the present embodiment. , can be used as a topsheet for sanitary napkins or as a body-side liner for disposable diapers. When the wiping sheet 1 is used for such a product, the air permeability is good and the body fluid diffusivity is excellent compared to the case where other wiping sheets are used.

The surface layer 2 and the back surface layer 3 constituting the wiping sheet 1 are bonded to each other with a binder such as an adhesive, or a mechanical entangling method such as a needle punch entanglement method or a fluid entanglement method (water flow entanglement method, air entanglement method) It can be integrally laminated|stacked by various well-known methods, such as entanglement method), Preferably it is integrated by the water flow entanglement method. The wiping sheet 1 may be formed in the form of a binder nonwoven fabric by bonding both layers 2 and 3 with an adhesive (binder) as long as the effect of the present invention described later is brought about, but both layers 2 and 3 are When the fibers 4 and 5 to be formed are entangled and integrated with each other according to the water flow entanglement method, the entire stacked fiber webs are denser and more uniform while eliminating the hardening of the wiping sheet due to the use of a binder. It is possible to obtain a wiping sheet that can be entangled, is excellent in flexibility, and has a good feel. In the case where the wiping sheet 1 is not formed by the fluid entanglement method, pressure heating treatment may be performed to shape the back surface layer 3 into a concave-convex shape.

<Manufacturing method of wiping sheet>

5 is a side view schematically showing a major part in the manufacturing process of the wiping sheet 1 . Referring to FIG. 5, the main part in the manufacturing process will be described. First, the first web 71 (upper layer) for forming the surface layer 2 and the second web for forming the back surface layer 3 ( The composite web 73 formed by laminating the lower layer) 72 is conveyed in the machine direction MD under the jetting action of a high-pressure water stream. The composite web 73 is, optionally, supplied with a water film from the tank 74 to stabilize the shape, and then is guided to an endless belt-shaped mesh screen 75 as an open hole support. A suction 76 is applied from below the mesh screen 75 to drain the water, and a high-pressure water stream is sprayed from a nozzle 77 provided with a plurality of orifices having a predetermined diameter and pitch from above. A plurality of nozzles 77 are arranged in a direction crossing the machine direction MD.

The mesh screen 75 is formed by plain weaving a plurality of stainless steel wires crossing each other, for example, a warp wire 75a and a weft wire 75b orthogonal to each other, a plurality of openings and a wire rod ( 75a, 75b) has a plurality of knuckle portions 78 that cross each other. In this manufacturing process, by spraying a high-pressure water stream to the side of the 1st web 71, the smoothness of the skin-contacting surface side in the 1st web 71 improves, and the surface layer 2 becomes favorable to a touch, but the latter stage Insofar as the effect of the present invention of may do Further, as a preliminary entangling treatment, after needle punching treatment is applied to the composite web 73 , a high-pressure water flow treatment may be performed on one side or both sides. In the knuckle part 78 , the warp wire 75a and the weft wire 75b are superimposed with each other to become convex toward the composite web 73 .

Again, referring to Figs. 3 to 5, by this high-pressure water flow treatment, the fibers of the first web 71 and the fibers of the second web 72 are entangled, and on the mesh screen 75, the second web ( Among the fibers (short fibers) constituting 72), fibers located on the knuckle portion 78 move by the action of the high-pressure water jet, so that they are rearranged in the knuckle portion 78, and open holes in which fibers do not exist. (80) is formed. In addition, in the second web 72 , a plurality of furrows 82 that are arranged in the cross direction and extend in the machine direction MD are formed by the high-pressure water flow sprayed from the plurality of nozzles 77 arranged in the cross direction. And, the ridge 81 positioned between the ridges 82 is formed. The plurality of ridges 81 and the grooves 82 are arranged alternately in the second direction Y, and the open holes 80 are positioned in the first direction X ( They are arranged to be spaced apart by a predetermined dimension in the intersecting direction), and form an open hole row. On the other hand, the first web 71 to which the high-pressure water stream is directly sprayed has a relatively small fiber gap, and the long fibers 4 made of ultrafine fibers such as nylon are randomly arranged and are sprayed in a state in which the fibers can move between them. Therefore, the long fibers 4 are irregularly arced and spread uniformly in a mesh shape without being shaped into concavities and convexities like the second web 72 and forming a plurality of open holes 80, so to speak, It has a network structure. The long fibers 4 are mainly entangled with each other to form a sheet, but a part may be fused.

In the water flow entanglement method, it is preferable to treat with a relatively low water pressure, and specifically, a column having a water pressure of 1 to 8 MPa from a nozzle 77 in which orifices having a hole diameter of 0.1 to 0.5 mm are arranged at intervals of 0.2 to 2.0 mm. It is preferable to spray the mold water stream onto the composite web 73 . By treating with a relatively low water pressure, in the first web 71, the entanglement of the filaments 4 is maintained without loosening, while maintaining the mesh shape in the second web 72 in the second direction (Y). Thus, it is possible to form a concave-convex structure by the ridges 81 and ridges 82 that are alternately arranged.

The long fibers 4 in the first web 71 may be oriented in the machine direction (MD) depending on the manufacturing method (eg, melt blown method). However, when randomly distributed and entangled with each other, , it is easier to form a network structure in which the long fibers 4 are irregularly arced and uniformly spread in a mesh shape. The long fibers 4 and the short fibers 5 are entangled with each other in the ridges 81 of the back layer 3, and in the furrows 82 of the back layer 3, among the long fibers 4 At least some of them span some of the plurality of open apertures 80 .

The wiping sheet 1 having such a laminated structure is for wiping away cosmetic powder particles such as sebum or ceramics adhering to the skin, using the surface 1a as the first wiping surface, in a dry state and a wet state. It can be used as a sheet, for example, a wet tissue, a sheet for wiping a cosmetic, or a covering sheet for a cosmetic pad. In the surface 1a formed from the surface layer 2, since the ultrafine filaments 4 are uniformly spread in a mesh shape, when they are rubbed against the face, the edge of the mesh, which is the peripheral edge of the mesh, is formed. By the edge effect, the long fibers 4 can enter pores to scrape off makeup, sebum, and the like, and absorb them inside the mesh, so that the surface layer 2 can exert a brushing function.

In order to exhibit such a brushing function, for example, as the fibers constituting the surface layer 2, ultrafine fibers obtained by dividing divided composite fibers may be used. There is a risk of giving stimulation to As in the wiping sheet 1 according to the present embodiment, by using the long fibers 4 made of non-divided ultrafine fibers made of nylon or the like for the surface layer 2, such irritation to the skin can be eliminated. In addition, since the long fibers 4 do not have fiber ends on the surface 1a unless they are cut during the manufacturing process of the wiping sheet 1, stimulation caused by the fiber ends coming into contact with the skin is reduced. can be suppressed

In addition, in the back surface layer 3 forming the back surface 1b, a plurality of ridges 81 and ridges 82 extending in the first direction X are alternately arranged in the second direction Y. and a plurality of opening holes 80 are formed in the groove portion 82, so that the back surface 1b can also function as a second wiping surface. That is, in the case where the back surface 1b is of a flat type without open holes and irregularities, when the user uses the back surface 1b as a wiping surface for the skin, dirt such as makeup powder or dust is not captured, and the dirt is sufficiently removed. can't be wiped off In the wiping sheet 1 according to the present embodiment, since a plurality of opening holes 80 are formed in the back surface layer 3, the back surface 1b is not flat, and is opened when the skin is rubbed with the back surface 1b. In the hole 80, dirt such as makeup powder or dust can be captured, and sufficient wiping properties can be exhibited. Accordingly, the user of the wiping sheet 1 can freely select and use either the front surface 1a or the back surface 1b as the wiping surface. As described above, as long as the front and back surfaces of the wiping sheet 1 function as a wiping surface, the back surface 1b side does not need to be flat, and the back surface layer 3 is necessarily formed with a plurality of ridges 81 and grooves. It is not necessary to have the uneven|corrugated shape by (82).

<When the wiping sheet is used in a dry state>

6 shows a cosmetic pad 10 comprising a cushioning layer (batting) 20 formed of absorbent fibers and a covering sheet 21 based on the wiping sheet 1 overlying the cushioning layer 20. It is a perspective view, and FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. The covering sheet 21 is located on the skin-contacting surface, the non-skin-contacting surface, and the skin-contacting surface side, and corresponds to the outer layer 24 corresponding to the surface layer 2 of the wiping sheet 1, and the back layer 3 It has an inner layer 23 which is

On the skin-contacting surface of the cosmetic pad 10, the long fibers 4 of low hygroscopicity in the outer layer 24 form an irregular arc and spread in a mesh shape. A substantially uniform liquid film that spreads uniformly on the skin-contacting surface of (10) is formed. Therefore, when the cosmetic pad 10 is impregnated with a liquid cleansing agent to wipe off dirt on the skin, the liquid cleansing agent can be evenly penetrated into the skin to wipe off the dirt on the entire skin. Further, when the cosmetic pad 10 impregnated with a relatively large amount of cosmetic liquid is used as a cosmetic pack sheet, the cosmetic liquid penetrates to every corner of the entire skin-contacting surface, so that good adhesion to the skin can be exhibited.

In addition, since a plurality of relatively small fiber gaps are formed by arranging the ultrafine filaments 4 in a mesh shape in the surface layer 2, compared to the case where the fibers are densely aggregated to such a degree that the fiber gaps are not formed. The brushing function is excellent, and the liquid retention property of liquids such as cosmetic liquid in the surface layer 2 compared to the case where the fiber gap is relatively large or the case where a plurality of open holes 80 are formed like the back surface layer 3 . (liquid residual property) is good. That is, since the long fibers 4 are composed of hygroscopic fibers with relatively low absorbency, the liquid enters the fiber gaps without being absorbed by the fibers, and is stably maintained in the surface layer 2 for a certain period of time by surface tension. Therefore, even when a relatively small amount of the cosmetic liquid is impregnated into the covering sheet 21, the cosmetic liquid is not absorbed into the inner layer 23 or the cushion layer 20 in an instant, and the outer layer 24 is wet for a certain period of time. Since the surface layer 2 is in the state of being impregnated with the cosmetic liquid, the cosmetic liquid does not penetrate inside and the skin-contacting surface is not in a dry state until the face is in the air. In addition, in the surface layer 2, the long fibers 4 are spread in a mesh shape in irregular arcs, so that the open holes 80 of the back surface layer 3 are covered, and the mesh is also formed above the open holes 80. As a result, the cosmetic liquid impregnated in the surface layer 2 does not move directly from the open hole 80 to the cushion layer 20, and thus it is possible to exhibit good liquid residual properties as described above.

When the wiping sheet 1 is formed only of the ultrafine filaments 4, the wiping property is excellent, but the elasticity is weak and the sheet strength may be lowered. By being integrated with the back surface layer 3 formed of short fibers 5 with a large fiber diameter, the wiping sheet 1 has adequate elastic strength and sheet strength. Accordingly, the wiping sheet 1 is suppressed from being greatly deformed or the surface layer 2 from being wrinkled in a dry state and a wet state, and a stable wiping operation can be performed. Further, since the back surface layer 3 has an uneven shape formed by a plurality of ridges 81 and ridges 82, the bending rigidity in sheet strength of the wiping sheet 1 is lower than that of the flat type. By improving, the impregnated liquid can be moved quickly.

As described above, when the wiping sheet 1 is used for the covering sheet 21 of the cosmetic pad 10, the long fibers 4 expand in a mesh shape on the skin-contacting surface, thereby scraping away dirt or the like entering the pores. When the cosmetic liquid is impregnated from the skin-contacting surface side, a uniformly spreading liquid film is formed, and the skin can be wiped off evenly. In addition, since the inner layer 23 has a concave-convex structure by the plurality of ridges 81 and ridges 82 , an appropriate elastic strength is imparted and the wiping operation is stably performed, and transition to the inner layer 23 . A cosmetic liquid or the like may be diffused throughout the sheet along the furrows 82 , and may pass through the plurality of open holes 80 to be rapidly absorbed into the cushion layer 20 .

<When used in wet condition>

8 (a) is a perspective view of a container 91 for refilling of a wet sheet (wet tissue) 90 using the wiping sheet 1 as a substrate, and (b) of FIG. It is a schematic partial side view of the laminated body in which the several wet sheet 90 is laminated|stacked.

Referring to (a) of FIG. 8 , the container 91 is a laminate in which the wet sheet 90 folded in the Z-shape and the inverted Z-shape is alternately polymerized. A part of the wet sheet 90a located at the top of the stacked body in the wet sheet 90 protrudes from the outlet 93 . When the protruding portion is pulled up, the wet sheet 90a is separated from the superposed wet sheet 90b and drawn out of the container 91, and a part of the wet sheet 92b protrudes from the outlet 93. .

In the wet sheet 90 accommodated in this aspect, similar to the cosmetic pad 10, the network structure of the long fibers 4 in the surface layer 2 has excellent wiping properties, and the back layer 3 It also has an appropriate elastic strength and shape-retaining properties, so that the wiping operation can be performed stably. In addition, in the wet sheet 90, since the back layer 3 is mainly composed of absorbent short fibers 5 such as rayon, a container 91 in a state in which a predetermined amount of a wet component such as water or alcohol is maintained in advance. Since air permeability in the thickness direction is excellent by having a plurality of open holes 80, air stagnation does not occur between the wet sheets 90 superposed in a wet state.

Referring to FIG. 8(b), in the laminated body, in the wet sheet 90 to be polymerized folded in a Z-shape and an inverted Z-shape, the back layer 3 of the wet sheet 90a to be drawn out and the next The back layers 3 of the wet sheet 90b to be drawn out face each other and are in contact. When the back surface layer 3 (rear surface 1b) is flat, when the wet sheet 90 is taken out, the back layer of the wet sheet 90a to be taken out is at the portion where the back layers 3 are in contact with each other. (3) and the slippage of the back layer 3 of the wet sheet 90b to be taken out next, there is a fear that a part of the wet sheet 90b cannot be protruded from the ejection port 93 to the extent that it is easy to grip. According to the wet sheet 90 made of the wiping sheet 1 according to the present embodiment, since a plurality of open holes 80 are formed in the back surface layer 3, the back surface 1b is not smooth, so that the With respect to the wet sheet 90a to be taken out, the wet sheet 90b to be drawn out next is caught, so that a part of the wet sheet 90b can be surely protruded from the ejection port 93 .

The surface layer 2 and/or the back surface layer 3 in the wiping sheet 1 of the present invention may be formed not as a single layer but as a plurality of layers, especially when use in a wet state is planned. In this case, in order to improve sheet strength, you may have a multilayer structure. In this case, for example, in addition to having a two-layer structure of the surface layer 2 and the back surface layer 3, respectively, as the back surface layer 3 between the fibrous webs used as the surface layer 2 in the illustrated example. A single-layer back surface layer 3 or surface layer 2 may be laminated on the surface layer 2/back surface layer 3 having a two-layer structure through a used fibrous web.

In the present invention, since the content of the long fibers 4 made of ultrafine fibers in the surface layer 2 is about 60 to 100 mass%, compared to the case where the content is less than about 60%, the wiping sheet 1 has: The number of contact points with the object using it increases, and it is excellent in a feeling of touch and adhesiveness. The long fibers 4 are dispersed in the form of short fibers. Alternatively, a plurality of short fibers may be aggregated into bundles to form a fiber aggregate (tow). In the case where the long fibers 4 are aggregated in a bundle form, large dirt can be replenished by the bundles, and the ultrafine filaments 4 forming the bundle enter the pores and scrape off small dirt to the inside of the bundle. Since it can collect, the wiping property is improved.

6 and 7, the configuration of the cosmetic pad 10 in which the wiping sheet 1 is used will be further described. (R), the first surface 11 and the second surface 12 located on the opposite side thereof, both edges 13 and 14 extending in the first direction (S), and in the second direction (R) between the extending end edges 15 and 16, first and second ends 17 and 18 spaced apart from each other in the first direction S, and the first and second ends 17 and 18 It has an intermediate portion 19 in which it is located. In the middle portion 19 , the width in the second direction R is constant, and at the first and second ends 17 and 18 , the dimensions in the second direction R are respectively at both ends 15 and 16 . Both edges 13 and 14 are inclined so as to become smaller toward the . The covering sheet 21 is superimposed to cover the cushion layer 20, and in order to maintain such a laminated state, the laminated portions are bonded to each other in both bonding portions 45 and 46 along both edges. By maintaining such a laminated state of the covering sheets 21, between the joint portions 45 and 46, an openable and openable pocket 50 having an opening edge portion 51 extending in the second direction R is formed. The dimension L1 in the first direction S of the cosmetic pad 10 is about 45 to 65 mm, and the dimension in the second direction R is about 65 to 85 mm, and the The dimension in the first direction S is larger than the dimension in the first direction S of the first and second end portions 17 and 18 .

It is preferable that the mass of the cushion layer 20 in the cosmetic pad 10 is about 0.2-0.4 g. As for the cushion layer 20, it is preferable that the mass per unit area in the intermediate part 19 is smaller than that in the 1st and 2nd edge parts 17 and 18. In addition, the mass per unit area of each other in the 1st and 2nd edge part 17 and 18 of the cushion layer 20 can be made to be substantially the same or different, and in this embodiment, the 1st and 2nd edge part ( 17, 18) have almost the same mass per unit area. Further, for example, by making the mass per unit area of the first end 17 of the cushion layer 20 larger than that of the second end 18 , a finger is placed in the pocket 50 from the opening edge 51 . When inserting and using the cosmetic pad 10, the flexibility of the end portion (the first end portion 17) on the side where the finger is inserted can be improved to provide a soft feel.

The cushion layer 20 is a fiber aggregate mainly containing hydrophilic fibers, and hydrophobic fibers may be mixed with the fiber aggregate as long as the required absorbency of the cushion layer 20 is not impaired. Specifically, it contains about 80 mass % or more of hydrophilic fibers. As a hydrophilic fiber, a rayon fiber, a cotton fiber, an acrylic fiber, etc. can be used, for example. As the hydrophobic fiber, for example, a synthetic fiber formed from a synthetic resin such as polyethylene, polyester, or polypropylene, or a synthetic fiber composite fiber formed from these synthetic resins can be used. In this embodiment, the cushion layer 20 is formed of the fiber aggregate which mainly uses rayon fiber. When a rayon fiber is used as a hydrophilic fiber, compared with the case where a cotton fiber is used, the water soluble property at the time of using a lotion impregnated can be improved.

In addition, the fibers forming the outer layer 24 are long fibers 4 , and when the fiber length is relatively large, for example, in the first direction (S) and/or the second direction (R) of the cosmetic pad 10 . In the case where the dimension is larger than the above dimensions, the distal end of the fiber does not exist on the first and second surfaces 11 and 12 . When the outer layer 24 is formed of short fibers 5 having distal ends of the fibers on the first and second surfaces 11 and 12, when the cosmetic pad 10 is used, these distal ends come into contact with the skin. Although there is a risk of irritation, by using the long fibers 4 continuous on the first and second surfaces 11 and 12 so that the distal end does not exist except for the outer peripheral edge of the cosmetic pad 10, short fibers Compared to the case of using , it is possible to improve the feel. In the decorative pad 10 according to the present embodiment, since the bonding portion 44 is formed inside each of the both side edges 13 and 14 of the decorative pad 10 which is the cut line of the covering sheet 21, the second In the face 12, in the cosmetic liquid application area defined by each of the joint portions 44 and both ends 15 and 16, the distal end of the long fibers 4 does not exist, so that a good feel can be obtained.

When the inner layer 23 contains hydrophobic thermoplastic fibers, since the hygroscopicity/absorbency of the inner layer 23 is lowered, the action of drawing in the cosmetic liquid or the like held in the outer layer 24 is suppressed, and the skin-contacting surface side Liquid residual property can be improved more. In addition, when the laminated covering sheets 21 in each of the joint portions 45 and 46 are joined by embossing/deboss processing by heat or ultrasonic waves, preferably, when joining while welding, inner layers ( 23) and the outer layer 24, when the inner layer 23 is a non-fusible rayon fiber, there is a fear that the bonding strength is lowered. When the inner layer 23 contains the thermoplastic fiber, fusion of the inner layer 23 and the outer layer 24 is facilitated, the bonding strength at the bonding portion 44 is improved, and peeling of the portion during use can be prevented. have.

[Example]

Hereinafter, examples and the like of the present invention will be specifically described, but the present invention is not limited to the following examples.

[Example 1]

Wiping sheet: thickness 0.25 mm, mass per unit area 30 g/m2

Surface layer: thickness 0.09 mm, mass per unit area of 10 g/m 2 ,

melt blown nonwoven fabric (nylon 6: 100 mass%);

Average fiber diameter of long fibers 4 μm

Back layer: thickness 0.16 mm, mass per unit area of 20 g/m 2 ,

Spunlace nonwoven fabric (short fiber: rayon; 80% by mass;

heat-sealable fibers; 20% by mass),

Average fiber diameter of short fibers (rayon and heat-sealable fibers) 16 μm

[Example 2]

Wiping sheet: thickness 0.25 mm, mass per unit area 30 g/m2

Surface layer: thickness 0.09 mm, mass per unit area of 10 g/m 2 ,

melt blown nonwoven fabric (nylon 6: 100 mass%);

Average fiber diameter of long fibers 4 μm

Back layer: thickness 0.16 mm, mass per unit area of 20 g/m 2 ,

rayon fiber (rayon: 100% by mass);

Average fiber diameter of short fibers (rayon) 15 μm

[Comparative Example 1]

Wiping sheet (single layer): thickness 0.27 mm, mass per unit area of 30 g/m 2 ,

melt blown nonwoven fabric (nylon 6: 100 mass%);

Average fiber diameter of long fibers 4 μm

[Comparative Example 2]

Wiping sheet (single layer): thickness 0.25 mm, mass per unit area of 30 g/m 2 ,

Spunlace nonwoven fabric (cotton: 100% by mass);

Average fiber diameter 15 μm

[Comparative Example 3]

Wiping sheet (single layer): thickness 0.25 mm, mass per unit area of 30 g/m 2 ,

Spunlace nonwoven fabric (rayon: 100% by mass);

Average fiber diameter 15 μm

For each Example and Comparative Example, mean surface friction coefficient (MIU), mean deviation of surface friction coefficient (MMD), mean deviation of surface roughness (SMD) as surface properties were measured, in addition to a wiping test and a sensory test was carried out. Table 1 shows the results of the measurements and the tests. In addition, this measurement is generally known as a characteristic value indicating the texture of the nonwoven fabric. Characteristic value with KES manufactured by Katotech Co., Ltd. (Reference: Standardization and interpretation of texture evaluation (2nd edition), published by the author Hideo Kawabata July 10, 1980).

The measurement method of each measurement item shown in Table 1, and the evaluation standard in each test item are as follows. In addition, the result of each test was evaluated as A (excellent), B (good), C (normal), and D (bad).

<Measuring method of surface properties>

For the measurement of surface properties, using KES-FB4 manufactured by Katotech Co., Ltd., the range of 1.0 cm x 1.0 cm in the cosmetic application area of each sample was taken as a sample, and the part used as the sample had a metal surface. It was placed on a test bench and measured. For the measurement of the surface roughness, a load of 10 gf was applied on the surface of the sample, and as a contact terminal, a 0.5-cm-wide thing in which a piano wire having a diameter of 0.5 mm was wound in a coil shape was used. In the measurement of surface friction, a force of 50 gf was applied to the contactor in which 10 piano wires having a diameter of 0.5 mm were arranged, and the contact surface of the contactor was pressed against the sample. In the measurement of surface friction and surface roughness, the sample was moved 2 cm horizontally at a speed of 0.1 cm/sec, and a uniaxial tension of 20 gf/cm was applied to the sample. The characteristic value was measured about each of the 1st direction (X) and the 2nd direction (Y) of each sample, and the average was calculated|required.

≪Evaluation criteria≫

1. Value of mean surface friction coefficient (MIU)

A: 0.25 or more

B: 0.20 or more, less than 0.25

C: 0.15 or more, less than 0.20

D: Other than that

2. Mean Deviation of Surface Friction Coefficient (MMD)

A: 0.0080 or less

B: greater than 0.0080, less than or equal to 0.0090

C: greater than 0.0090, less than or equal to 0.0100

D: greater than 0.0100

3. Value of mean deviation (SMD) of surface roughness [㎛]

A: 4.0 or less

B: more than 4.0, less than 4.5

C: greater than 4.5, less than 5.0

D: greater than 5.0

<wiping test>

A wiping test was performed on cosmetics (foundation) using the wiping sheet 1 of the present invention and the wiping sheet of the comparative example. As the test apparatus, a friction wear measuring apparatus TL201Ts manufactured by Trinity Lab Co., Ltd. was used. In addition, the wiping sheet and the wiping sheet 1 of the comparative example which are samples were tested in the state in which liquids, such as a cosmetic liquid, were not applied. First, on the surface of a rectangular slide glass having a width of 26 mm and a length of 90 mm, 0.02 g of cosmetics was applied in a circular shape with a diameter of 13 mm centered at a position of 20 mm from the edge in the longitudinal direction to obtain a test piece. . Next, the wiping sheet 1 as the sample is inserted into the pad jig (depth 20 mm, width 70 mm) of the test apparatus with the surface 1a being the exposed surface, and 40 minutes have elapsed after cosmetic application. 60 mm from the end edge of the test piece at a moving speed of 2.5 mm/s while applying a constant load (a load of 100 g for an area of 5.2 cm 2 of the wiping sheet 1 in contact with the test piece) to a dedicated jig to the test piece. Cosmetics were wiped off during transfer. In addition, in this measurement, as a cosmetic, a generally widely distributed foundation (eg, one containing a preservative, a surfactant, an ultraviolet absorber, a tar-based colorant, an artificial fragrance, etc. as components) was used.

Next, the surface of the test piece after wiping off the cosmetics is read with a scanner (GT-X750 manufactured by Seiko Epson Co., Ltd.), and then the image is read using image software (Adobe Photoshop Elements 3.0), and Histogram Analysis software Histogram processing was performed using , and binarization processing was performed. The value of the binarization process of the test piece before wiping off the cosmetics was made into 100, the value of the binarization process of the test piece after wiping was shown by the ratio, and it was set as the wiping rate. The number of samples in each example was set to N=3, respectively, and the average value was computed.

<Evaluation method>

A: Wiping rate of 90% or more

B: Wiping rate 80% or more, less than 90%

C: Wiping rate 70% or more and less than 80%

D: Wiping rate less than 70%

<sensory evaluation>

A wet sheet was prepared by permeating each wiping sheet with a size of 12 cm x 12 cm with distilled water 3 times the mass of the sheet, and 10 female panelists wiped the foundation applied to the face with each wet sheet. The "softness", "smooth feeling", and "wiping feeling" of the wet sheet were evaluated in four grades.

1. Softness

A: soft

B: slightly soft

C: Can't say either way

D: not smooth

2. Smooth feeling

A: There is a feeling of smoothness

B: There is a slightly smooth feeling

C: Can't say either way

D: No smooth feeling

3. Wiping feeling

A: There is a feeling of wiping

B: There is a slight wiping feeling

C: Can't say either way

D: No wiping feeling

<Measurement result>

As shown in Table 1, on the surface 1a side of the wiping sheets 1 of Examples 1 and 2, the average surface friction coefficient (MIU) is 0.25 or more, and the average deviation (MMD) of the surface friction coefficients is The value of was 0.008 or less, and the mean deviation (SMD) of surface roughness [unit: μm] was 4.0 or less. On the other hand, the wiping sheet of Comparative Example 1 had an MIU of 0.25 or less, an MMD of 0.008 or less, and an SMD of 5.0 or less, and the wiping sheet of Comparative Example 2 had an MIU of less than 0.20, an MMD of 0.008 or less, and an SMD of 4.0 or less. and, the wiping sheet of Comparative Example 3 had an MIU of less than 0.20, an MMD of more than 0.100, and an SMD of 5.0 or less. Further, in the wiping test, the wiping sheets 1 of Examples 1 and 2 and the wiping sheet of Comparative Example 1 each had a wiping rate of 90% or more, and 90% without cosmetic liquid applied. showed a high wiping rate over . On the other hand, in the wiping sheets of Comparative Examples 2 and 3, the wiping rate was less than 80%.

From the results of these measurement and evaluation, in the wiping sheet 1 of Examples 1 and 2, on the surface 1a side, the long fibers 4 form an irregular arc and spread in a mesh shape, so that the surface 1a When the side is relatively smooth and a liquid such as a cosmetic liquid is supplied to the surface 1a side, the liquid spreads uniformly over the entire surface 1a to form a uniform liquid film. Further, the wiping sheets 1 of Examples 1 and 2 include long fibers 4 made of ultrafine fibers, so that a plurality of small edge portions are formed on the surface 1a side, so that they have a relatively high frictional resistance. Therefore, it is excellent in handling property and can be wiped off so as to scrape off the minute dirt that has entered the pores.

As described above, the wiping sheets 1 of Examples 1 and 2 are made of long fibers 4 whose surface 1a is made of ultrafine fibers, are relatively smooth, and have relatively high frictional resistance. Therefore, also in the sensory evaluation, the evaluation of "softness", "smooth feeling" and "wiping feeling" was "A", and the sheet properties of the wiping sheet 1 were actually confirmed as feeling of use. On the other hand, since the wiping sheets of Comparative Examples 1 to 3 have a relatively uneven surface and relatively low frictional resistance, a uniform liquid film is formed as in Examples 1 and 2, or a sufficient brushing function is not exhibited. In all the items of evaluation, evaluation did not become "A".

As the material constituting the wiping sheet 1 according to the present invention, in addition to the materials described in the specification, various known materials commonly used in this type of article can be used without limitation. In addition, in the specification and claims, the terms "first", "second", and "third" are used to simply distinguish the same element, position, and the like.

The disclosure related to the present invention described above can be summarized at least in the following matters.

A wiping sheet having a first direction and a second direction intersecting it, a surface layer mainly composed of hygroscopic long fibers having an average fiber diameter of 10 μm or less, and a back layer mainly composed of short fibers having an average fiber diameter of more than 10 μm As such, in the surface layer, the long fibers are irregularly arced and uniformly spread in a mesh shape, and a plurality of open holes arranged in the first direction are formed in the back surface layer, and the long fibers are At least part of the hole is covered.

The invention disclosed in paragraph 0063 above may include at least the following embodiments.

(1) the back layer further has a plurality of ridges and a plurality of ridges extending in the first direction, wherein the ridges and the ridges are alternately arranged in the second direction, and the plurality of open holes It is formed in the said furrow part.

(2) The density of the surface layer is 0.05 to 0.2 g/cm 3 , and the thickness of the surface layer is about 20 to 60% of the thickness of the back layer.

(3) The wiping rate of the said surface layer in a dry state is 80 % or more.

(4) The average surface friction coefficient (MIU) of the surface is 0.25 or more, and the average deviation (SMD) of the surface roughness is 4.0 µm or less.

(5) The long fiber is nylon.

(6) The short fibers have higher hygroscopicity than the long fibers.

(7) The short fibers are at least one of rayon and cellulosic fibers including cotton.

(8) A spunlace nonwoven fabric in which the surface layer and the back surface layer are integrated according to a water flow entanglement method.

1: wiping sheet
2: surface layer
3: Back layer
4: long fiber
5: short fiber
80: open hole
81: irrigation part
82: furrow
t2: thickness dimension of the surface layer
t3: thickness dimension of the back layer
X: first direction
Y: second direction

Claims (9)

A wiping sheet having a first direction and a second direction intersecting it, a surface layer comprising long fibers having hygroscopicity having an average fiber diameter of 10 μm or less, and a back layer comprising short fibers having an average fiber diameter of more than 10 μm as,
In the surface layer, the long fibers are irregularly arced and uniformly spread in a mesh shape, and a plurality of open holes arranged in the first direction are formed in the back layer, and the long fibers are formed in the open holes. A wiping sheet covering at least a part. According to claim 1, wherein the back layer further has a plurality of ridges and a plurality of ridges extending in the first direction, wherein the ridges and the ridges are alternately arranged in the second direction, The opening hole of the wiping sheet is formed in the groove portion. The wiping sheet according to claim 1 or 2, wherein the density of the surface layer is 0.05 to 0.2 g/cm 3 , and the thickness dimension of the surface layer is 20% to 60% of the thickness dimension of the back layer. The wiping sheet according to claim 1 or 2, wherein a wiping rate of the surface layer in a dry state is 80% or more. The wiping sheet according to claim 1 or 2, wherein the average surface friction coefficient (MIU) of the surface is 0.25 or more, and the average deviation (SMD) of the surface roughness is 4.0 mu m or less. The wiping sheet according to claim 1 or 2, wherein the long fibers are nylon. The wiping sheet according to claim 1 or 2, wherein the short fibers have higher hygroscopicity than the long fibers. The wiping sheet according to claim 1 or 2, wherein the short fibers are at least one of cellulosic fibers including rayon and cotton. The wiping sheet according to claim 1 or 2, wherein said surface layer and said back surface layer are spunlace nonwoven fabrics integrated with a water flow entanglement method.

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