TWI683046B - Wiping sheet - Google Patents

Abstract

Provides a good skin feel on the surface side Non-woven fabric with wiping properties on the inside.

One with: the first direction (X) and orthogonal to this The second direction (Y); the surface layer (2), which is mainly composed of hygroscopic long fibers (4) having an average fiber diameter of 10 μm or less; and the inner layer (3), which is composed of an average fiber diameter The short fibers 5 exceeding 10 μm are mainly composed of non-woven fabric (1), in which: in the surface layer (2), the long fibers (4) are irregularly drawn in an arc and diffuse uniformly in a net shape, and are formed in the inner layer (3) There are a plurality of openings (80) arranged in the first direction (X), and the long fiber (4) spans at least a part of the openings (80).

Description

Wiping sheet

The invention relates to a non-woven fabric, in particular to a non-woven fabric that can be wiped in a dry state and a wet state.

Conventionally, nonwoven fabrics for wipes using extremely fine fibers (fine fibers) having an average fiber diameter of 10 μm or less have been known. For example, Patent Document 1 discloses a non-woven fabric having: a surface layer containing ultrafine fibers formed by cutting fibers of a split-type composite fiber; and an inner layer containing hydrophilic fibers having an average fiber diameter larger than the ultrafine fibers Sex fiber.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 3944526

Such a non-woven fabric is used as a sheet for sebum and makeup dirt that wipes the face in a dry or wet state. The surface layer formed by the ultra-fine fibers directly contacts the user's skin. The ultra-fine fibers can enter the pores to scrape away sebum and make-up dirt. Therefore, they are excellent in wiping properties and have low skin irritation and excellent skin feel.

However, if the split composite fiber of the surface layer is viewed in the radial direction, the surface of the fiber does not become a smooth curve, so there is a possibility of irritation to the skin when it touches sensitive skin. In addition, since the back surface formed by the hydrophilic fiber back surface layer is smooth, it does not easily function as a wiping surface. Therefore, when the user selects the back surface of the non-woven fabric as the wiping surface, the cosmetic powder and dust adhering to the face cannot be sufficiently captured.

An object of the present invention is to provide a non-woven fabric having a non-woven fabric on the front and back, which is improved in the prior art, has good skin feel on the surface, and can exhibit wiping properties on both surfaces.

In order to achieve the above-mentioned problems, the present invention relates to having: a first direction and a second direction crossing this; a surface layer mainly composed of long fibers with hygroscopicity with an average fiber diameter of 10 μm or less; and an inner layer It is a nonwoven fabric mainly composed of short fibers with an average fiber diameter exceeding 10 μm.

The nonwoven fabric of the present invention is characterized in that in the surface layer, the long fibers are irregularly arc-shaped and uniformly diffused in a mesh shape, and a plurality of openings arranged in the first direction are formed in the back layer, the long fibers Across at least a portion of the aforementioned openings.

According to the non-woven fabric of the present invention, the surface layer is uniformly diffused in a net shape by irregularly drawing arcs of long fibers with an average fiber diameter of 10 μm or less, which makes the skin feel good and has a good cleaning effect, and supplies cosmetic liquid When waiting for liquid, it can form a uniform liquid film and evenly wet the skin. In addition, the inner layer is formed with a plurality of openings arranged in the first direction, so that when the skin is rubbed, makeup powder and minute dust can be captured.

1‧‧‧non-woven fabric (non-woven fabric for wipes)

2‧‧‧Surface layer

3‧‧‧Inner layer

4‧‧‧Long fiber

5‧‧‧ staple fiber

80‧‧‧opening

81‧‧‧Spine

82‧‧‧ Ditch Department

t2‧‧‧ Thickness of surface layer

t3‧‧‧ Thickness of inner layer

X‧‧‧ 1st direction

Y‧‧‧ 2nd direction

The drawing shows a specific embodiment of the nonwoven fabric of the present invention, and not only the indispensable structure of the invention, but also a selective and ideal embodiment.

[Fig. 1] A perspective view of the nonwoven fabric of the present invention.

[Fig. 2] An enlarged plan view of a part of the surface layer.

[FIG. 3] is a cross-sectional view taken along the line III-III of FIG. 1.

[FIG. 4] It is an enlarged view of a part of the area enclosed by the one-dot chain line IV in FIG.

FIG. 5 is a side view schematically showing the main part in the manufacturing process of the nonwoven fabric.

Fig. 6 is a perspective view of a non-woven cotton pad using the present invention.

7 is a cross-sectional view taken along the line VII-VII of FIG. 6.

[Fig. 8] (a) is a perspective view of a container for replenishing wet sheets, and (b) is an enlarged side view of a part of the wet sheet laminate in the container.

[Form for carrying out the invention]

The following embodiments are related to the nonwoven fabric (nonwoven fabric) 1 for wipes shown in FIGS. 1 to 8 according to an embodiment of the present invention, and include not only a structure indispensable to the invention but also a selective and ideal structure.

1 and 2, the nonwoven fabric (nonwoven fabric) 1 for wipes of the present invention has a first direction X and a second direction Y crossing this, and includes: a surface 1a and an inner surface 1b; and a surface layer laminated on each other 2 with inner layer 3. The surface layer 2 is formed of a nonwoven fabric mainly composed of melt-blown fibers of hygroscopic long fibers (continuous fibers) 4 having an average fiber diameter of 10 μm or less. For the long fiber 4, for example, polyamide fiber such as nylon 6, nylon 66, etc.; acrylonitrile fiber, or hydrophobic fiber after hydrophilization treatment can be used. The content of the long fibers 4 in the surface layer 2 is about 60% by mass or more, preferably about 95% by mass or more, and 100% by mass in the present embodiment.

The inner layer 3 is, for example, short fibers 5 including cellulose-based short fibers such as water-absorbent recycled fibers such as rayon cotton, water-absorbent natural fibers having pulp fibers, etc., and short fibers such as thermoplastic synthetic fibers. . The content rate of the short fibers in the inner layer 3 is about 50 to 100% by mass of cellulose-based short fibers, and about 0 to 50% by mass of the short fibers of thermoplastic synthetic fibers. For thermoplastic synthetic fibers, for example, synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate, or mixtures of synthetic fibers; or composite fibers using two or more types of synthetic resins Wait. In addition, for composite fibers, a heart sheath type and an eccentric type formed of two kinds of synthetic fiber components with different melting points can be used, or by using this to allow crimping to occur in the short fiber 5 to form a stretchy, bulky Sexual inner layer 3.

The fiber length of the long fiber 4 is in the range of 30 to 200 mm, and the fiber length of the short fiber 5 is smaller than this. Furthermore, the average fiber diameter of the long fibers 4 (diameter of single fibers) 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 10 μm or less, more preferably about 5 μm Hereinafter, the average fiber diameter of the short fiber 5 is about 10 μm or more, and more preferably 10 to 20 μm. In addition, the long fiber 4 and the shorter fiber 5 have more low hygroscopicity. In this specification, the long fiber 4 is also referred to as ultrafine fiber and/or low hygroscopic fiber, and the short fiber 5 is also referred to as high hygroscopic fiber or Absorbent fiber.

Referring to FIGS. 3 and 4, the thickness t1 of the nonwoven fabric 1 for wipes is preferably about 0.2 to 0.3 mm, and the range of the mass per unit area of the nonwoven fabric 1 for wipes is about 25 to 40 g/m ² . In addition, the specific volume of the nonwoven fabric 1 for wipes is about 145 m ³ /kg in the present embodiment. The thickness t2 of the surface layer 2 is smaller than the thickness t3 of the inner layer 3, and the thickness t2 of the surface layer 2 is preferably 20 to 60% of the thickness t3 of the inner layer 3. Specifically, the thickness t2 of the surface layer 2 is about 0.02 to 0.15 mm, and the thickness t3 of the inner layer 3 is about 0.1 to 0.25 mm. When the thickness t2 of the surface layer 2 is less than 0.02 mm, the wiping portion of the non-woven cloth 1 for the wiper is too thin, there is a concern that the wiping property will be reduced. On the other hand, when the thickness t2 exceeds 0.15 mm, it is relatively due to the inside Since the thickness t3 of the layer 3 becomes smaller, the bending rigidity of the non-woven fabric 1 for wipes is reduced, and the toughness of the non-woven fabric 1 for wipes is weakened, which may cause distortion during use.

<Measurement method of thickness size>

The thickness dimension t1 of the nonwoven fabric 1 for wipes was measured using a thickness gauge (made by Dairy Scientific Seiki Co., Ltd., UF-60) with a load of 3.0 gf/cm ² applied to the nonwoven fabric 1 for wipes. The thickness dimensions t2 and t3 of the surface layer 2 and the inner layer 3 are measured by observing the cross section of the non-woven fabric 1 for the wipes using a microscope (made by Keynes, real surface view VE-7800). The density of the non-woven fabric 1, the surface layer 2 and the back layer 3 for wipes is calculated based on the density (g/cm ³ ) = mass per unit area (g/m ² )/thickness (mm) × 10 ^-3 The specific volume (m ³ /kg) of the nonwoven fabric 1 for wipes is calculated as the reciprocal of the density (g/cm ³ )×10 ³ .

Mass per unit area of the surface layer 2, is in the range of 5 ~ 30g / m ^2, and more preferably ² at 5 ~ 15g / m. The density of the surface layer 2 is preferably about 0.05 to 0.2 g/cm ³ , and this embodiment is 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 layer 3 is preferably about 25 g/m ² or more. The mass per unit area of the inner layer 3 is about 10 to 35 g/m ² , and more preferably about 15 to 30 g/m ² . The density of the inner layer ³ is preferably about 0.08 to 0.2 g/cm ³ .

The non-woven fabric 1 for wipes of the present invention can be used in either dry or wet state, and is suitable as a wiping sheet for wiping off the sebum adhering to the skin, make-up and other dirt, and an inner cotton covering the cotton pad Use thin sheets or wet sheets (wet paper towels) impregnated with detergent. In the wet state When the non-woven cloth 1 for wipes is used, it can be impregnated with a wetting agent such as water, ethylene glycol, etc.; chemicals such as alcohols, antibacterial agents; spices, and other ingredients by conventional methods. In addition, the non-woven fabric 1 for wipes can be used as a wipe of the present embodiment, and can be used on the surface sheet of sanitary napkins, the body-side pad of disposable paper diapers, etc., due to the cleanability on the front and back. . When the non-woven fabric 1 for wipes is used in such products, the air permeability is better than when other non-woven fabrics are used, and the body fluid diffusibility is excellent.

The surface layer 2 and the back layer 3 constituting the nonwoven fabric 1 for wipes can be joined to each other by an adhesive such as an adhesive, or by a mechanical interlacing method such as a needle interlacing method, a fluid interlacing method (water flow interlacing method, air flow) Various well-known methods such as the cross-over method) are layered into one, and ideally they are integrated by the water flow cross-over method. As long as the effect of the invention of the present invention described later is achieved, the two layers 2 and 3 can be adhered (adhesive) to form the non-woven fabric 1 for wipes in the form of a bonded non-woven fabric, but if the two layers are formed by the water flow interlacing method 2. The fibers 4 and 5 of 2, 3 are intertwined and integrated with each other, which can eliminate the hardening of the nonwoven fabric due to the use of the adhesive, and make the whole of the laminated fiber webs more densely and evenly wrapped around each other, which can be obtained Non-woven fabric with excellent softness and good skin feel. In addition, when the nonwoven fabric 1 for wipes is not formed by the fluid interlacing method, in order to shape the unevenness on the back layer 3, pressure heating treatment may be performed.

<Manufacturing method of non-woven cloth for wipes>

FIG. 5 is a side view schematically showing the main part in the manufacturing process of the nonwoven fabric 1 for wipes. If referring to Figure 5 for the main parts of the manufacturing process In order to explain separately, first, the first fiber web 71 (upper layer) for forming the surface layer 2 and the second fiber web (lower layer) 72 for forming the back layer 3 are formed by stacking the high-pressure water jet The composite fiber web 73 is transported in the machine direction MD. The composite fiber web 73 is selectively supplied with a water mold from the groove 74 to stabilize the shape, and then is guided to an endless belt-like mesh screen 75 as an opening support. At the same time as the suction 76 is discharged from the bottom of the mesh screen 75 to discharge water, a high-pressure water stream is sprayed from the nozzle 77 provided with a plurality of orifices having a predetermined diameter and pitch. A plurality of nozzles 77 are arranged in a direction crossing the machine direction MD.

The mesh screen 75 is formed by a plurality of stainless steel wires intersecting each other, for example, formed by flat-woven warp wires 75a and weft wires 75b orthogonal to each other, and having a plurality of openings, and a plurality of wires 75a, 75b crossing each other Eight fork section 78. In this manufacturing process, by spraying a high-pressure water flow on the side of the first fiber web 71, the smoothness of the skin contacting surface side in the first fiber web 71 is improved, and the surface layer 2 has good skin feel, but as long as it can To achieve the effects of the invention of the present invention described later, a high-pressure water flow may be sprayed to the side of the second fiber web 72, or a high-pressure water flow may be sprayed from both sides of the first fiber web 71 side and the second fiber web 72 side. In addition, for the preliminary cross-over treatment, after the composite fiber web 73 is subjected to the needling treatment, it may be subjected to high-pressure water treatment on one side or both sides. The prong section 78 is formed convex toward the composite web 73 by overlapping the warp wire 75a and the weft wire 75b with each other.

Furthermore, referring to FIGS. 3 to 5, by such high-pressure water flow treatment, while the fibers of the first fiber web 71 and the fibers of the second fiber web 72 are interlaced, a high-pressure water jet is sprayed on the mesh screen 75 Function 2 Among the fibers (short fibers) of the fiber web 72, the fibers located on the prongs 78 move, thereby forming openings 80 where the fibers do not exist while the prongs 78 are rearranged. In the second fiber web 72, a plurality of grooves 82 arranged in the cross direction and extending in the machine direction MD are formed by high-pressure water jets jetted from the plurality of nozzles 77 arranged in the cross direction, and formed between the grooves 82的部部81。 The spine 81. A plurality of ridges 81 and grooves 82 are alternately arranged in the second direction Y and located here, and the openings 80 are arranged at a predetermined size in the first direction X (cross direction) of the grooves 82 to form a row of openings. On the other hand, since the first fiber web 71 directly jetting the high-pressure water flow is an arbitrarily arranged fiber with a relatively small fiber gap, long fibers 4 made of ultrafine fibers such as nylon are sprayed in a state where the fibers can move between each other. The second fiber web 72 is formed with irregularities to form a plurality of openings 80, and the long fiber 4 has a so-called mesh structure in which irregular arcs are uniformly diffused in a mesh shape. Although the long fibers 4 are mainly intertwined to form a sheet, they may be partially welded.

In the water flow crossover method, it is ideal to perform treatment with a relatively low water pressure. Specifically, the water pressure is sprayed onto the composite fiber web 73 from a nozzle 77 having an orifice with an aperture of 0.1 to 0.5 mm at an interval of 0.2 to 2.0 mm. The columnar water flow of ~8MPa is ideal. By processing with a relatively low water pressure, the first fiber web 71 can be formed alternately in the second direction Y in the second fiber web 72 in addition to maintaining the mesh shape without disentanglement of the long fibers 4. The uneven structure caused by the ridge 81 and the groove 82.

The long fibers 4 in the first fiber web 71 may be oriented in the machine direction MD according to the manufacturing method (for example, melt-blown method), but if If they are arbitrarily distributed and intertwined with each other, it is easier to form a mesh structure in which the long fibers 4 irregularly draw arcs and spread uniformly in a mesh shape. The long fiber 4 and the short fiber 5 intersect each other at the ridge 81 of the inner layer 3, and at the groove 82 of the inner layer 3, at least a part of the long fibers 4 spans a part of the many openings 80.

The nonwoven fabric 1 for wipes having such a layered structure can be used as a sheet for wiping cosmetic powder particles such as sebum, powder, etc. adhered to the skin with the surface 1a as the first wiping surface in the dry state and the wet state. For example, it can be used as a cover sheet for wet tissues, sheets for makeup wiping, and cotton pads. On the surface 1a formed by the surface layer 2, the ultrafine long fibers 4 spread uniformly in a mesh shape, so when this is pressed against the face by rubbing the face, the length of the edge of the mesh as the periphery of the mesh is formed The fiber 4 can enter the pores to scrape out cosmetic powder, sebum, etc. by its edge effect, and accommodate this inside the mesh, and the surface layer 2 can achieve the cleaning function.

In order to achieve such a cleaning function, for example, ultrafine fibers obtained by splitting composite fibers may be used as the fibers constituting the surface layer 2. However, in this case, when the surface of the ultrafine fibers generated by the splitting is rubbed on the skin There are concerns about skin irritation. As in the nonwoven fabric 1 for wipes of the present embodiment, by using long fibers 4 made of non-segmented ultrafine fibers made of Nylon or the like on the surface layer 2, irritation to such skin can be eliminated. In addition, as long as the long fiber 4 is not cut during the manufacturing process of the nonwoven fabric 1 for wipes, since there is no fiber end on the surface 1a, it is possible to suppress irritation caused by the fiber end contacting the skin.

Furthermore, the inner layer 3 forming the inner layer 1b is on the second side A plurality of ridges 81 and grooves 82 extending in the first direction X are alternately arranged toward Y. By forming a plurality of openings 80 in the grooves 82, the back surface 1b can also function as a second wiping surface. That is, when the inner surface 1b is open and flat without irregularities, when the user uses the inner surface 1b as a wiping surface on the skin, the dirt such as makeup powder and dust cannot be captured, and the dirt cannot be sufficiently wiped off. Since the nonwoven fabric 1 for wipes of the present embodiment has a plurality of openings 80 formed in the back layer 3, the back surface 1b is not flat. When the skin is wiped with the back surface 1b, dirt such as cosmetic powder and dust can be captured in the opening 80 , Can exert sufficient wiping property. Therefore, the user can freely select either the surface 1a and the back surface 1b as the wiping surface using the nonwoven fabric 1 for wipes. In this way, as long as the front and back surfaces of the nonwoven fabric 1 for wipes function as the wiping surface, the back surface 1b side may be uneven, and the back layer 3 may not necessarily have a plurality of ridges 81 and grooves 82 due to the uneven shape.

<When using non-woven cloth for wipes in dry state>

FIG. 6 is a perspective view of a cotton pad 10 including a cushioning material layer (inner cotton) 20 formed of absorbent fibers; and a covering sheet 21 using the nonwoven fabric 1 for wipes that wraps the cushioning material layer 20 as a base material. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6. The covering sheet 21 has a skin contact surface and a non-skin contact surface; an outer layer 24 on the skin contact surface side corresponding to the surface layer 2 of the nonwoven fabric 1 for wipes; and an inner layer 23 corresponding to the inner layer 3.

On the skin-contacting surface of the cotton pad 10, by drawing an irregular arc on the outer layer 24 of the long fiber 4 with low hygroscopicity, it diffuses in a mesh shape, so that The liquid impregnated with makeup liquid or the like forms a slightly uniform liquid film spreading uniformly on the skin contact surface of the cotton pad 10 from the skin contact surface. Therefore, when the liquid cleansing agent is impregnated into the cotton pad 10 to wipe off the dirt on the skin, the dirt on the entire skin can be wiped off without allowing the liquid cleansing agent to penetrate the skin unevenly. In addition, when the cotton pad 10 impregnated with a relatively large amount of makeup liquid is used as a makeup mask, since the makeup liquid completely penetrates the entire skin contact surface, it can exert good adhesion to the skin.

In addition, the surface layer 2 is formed with a plurality of relatively small fiber gaps by arranging ultrafine long fibers 4 in a mesh shape, so the cleaning function is superior to when the fibers are tightly aggregated to the extent that no fiber gaps are formed, and Compared to when the fiber gap is relatively large, such as when the inner layer 3 is formed with a plurality of openings 80, the liquid retention (liquid residual property) of the liquid such as cosmetic liquid in the surface layer 2 is good. That is, since the long fibers 4 are composed of hygroscopic fibers with relatively low water absorption, liquid enters the fiber gap without being absorbed by the fibers, and can be stably maintained in the surface layer for a certain time by surface tension 2. Therefore, even when a relatively small amount of makeup liquid is impregnated into the covering sheet 21, there is no case where the makeup liquid is absorbed into the inner layer 23 and the buffer layer 20 instantly. Since the outer layer 24 is in a wet state for a certain period of time, the surface layer 2 is to make the surface layer impregnated with make-up liquid and touch the face so that the make-up liquid penetrates into the inside, so that the skin contacting surface will not become dry. In addition, an irregular arc is drawn on the surface layer 2 by the long fibers 4 and spreads in a mesh shape across the opening 80 of the inner layer 3, and a mesh is also formed above the opening 80, thereby preventing the surface In the case where the makeup liquid impregnated in the layer 2 moves directly from the opening 80 to the buffer material layer 20, such a good liquid as described above can be exerted Residual.

When the nonwoven fabric 1 for wipes is formed from only very fine long fibers 4, there are concerns that the toughness and the strength of the thin sheet may become lower in addition to superior wiping properties. However, the surface layer 2 and the average fiber diameter ratio are longer fibers. 4 The inner layer 3 formed by the larger short fibers 5 is integrated, and the nonwoven fabric 1 for wipes has moderate toughness strength and sheet strength. Therefore, the non-woven fabric 1 for wipes can suppress a large amount of distortion in the dry state and the wet state or the surface layer 2 is distorted, and a stable wiping operation can be performed. In addition, since the back layer 3 has a concave-convex shape formed by a plurality of ridges 81 and grooves 82, the bending rigidity of the sheet strength of the nonwoven fabric 1 for wipes is improved compared to the case of being flat, which allows the The impregnated liquid moves quickly.

As described above, when the non-woven cloth 1 for wipes is used for the covering sheet 21 of the cotton pad 10, the long fibers 4 spread in a mesh shape on the skin contact surface, which can scrape off dirt and the like that enter the pores. The makeup liquid forms an evenly spread liquid film when impregnated from the skin contact surface side, so that the skin can be wiped without unevenness. In addition, since the inner layer 23 has a plurality of uneven structures caused by the ridges 81 and the grooves 82, a moderate toughness strength is given to perform the wiping operation stably, and the make-up liquid and the like that the inner layer 23 moves along the grooves 82 It spreads to the whole sheet and can be quickly absorbed in the buffer material layer 20 through the plurality of openings 80.

<When using in wet state>

FIG. 8(a) is a perspective view of a container 91 for replenishing a wet sheet (wet paper towel) 90 using the non-woven fabric 1 for wipes as a base material, and FIG. 8(b) is received. The plurality of wet sheets 90 accommodated in the container 91 are schematic partial side views of the laminated body in a layered state.

Referring to FIG. 8( a ), the container 91 has an opening 93 that can be opened and closed. The wet sheets 90 folded into a zigzag shape and an inverted zigzag shape are accommodated in a layered body in an alternately stacked state. A part of the wet sheet 90a positioned at the uppermost part of the laminate in the wet sheet 90 protrudes. The wet sheet 90a is a portion that protrudes if pulled up, and is separated from the overlapping wet sheet 90b and pulled out of the container 91, and a part of the wet sheet 92b projects from the take-out port 93.

In this way, the wet sheet 90 contained in the surface layer 2 is similar to the cotton pad 10, and the long-fiber 4 mesh structure of the surface layer 2 is excellent in wiping property, and also has the inner layer 3 due to The moderate toughness strength and shape retention can be used to perform the wiping operation stably. In addition, the wet sheet 90 is mainly composed of water-absorbent short fibers 5 such as rayon, so it can be accommodated in the container 91 in a state of maintaining a certain amount of moisturizing components such as water and alcohol in advance, and Since the plurality of openings 80 have excellent air permeability in the thickness direction, the wet sheets 90 stacked in the wet state do not cause air stagnation.

Referring to FIG. 8(b), in the laminated body, the inner layer 3 of the wet sheet 90a which is folded into a zigzag shape and an inverted zigzag shape and stacked, and then must be pulled out The inner layer 3 of the wet sheet 90b abuts against each other. When the inner layer 3 (inner layer 1b) is flat, when the wet sheet 90 is pulled out, the inner layer 3 of the wet sheet 90a to be pulled out and the wet Inner layer of sheet 90b 3 When sliding, there is a concern that a part of the wet sheet 90b cannot protrude from the take-out port 93 to the extent that it is easy to hold. According to the wet sheet 90 made of the nonwoven fabric 1 for wipes of the present embodiment, since the plurality of openings 80 are formed in the inner layer 3 to make the inner surface 1b unsmooth, the wet sheet 90a to be pulled out must be The wet sheet 90b pulled out is hooked so that a part of the wet sheet 90b can surely protrude from the take-out port 93.

The surface layer 2 and/or the inner layer 3 in the nonwoven fabric 1 for wipes of the present invention may be not a single layer but may be formed of a plurality of layers. In particular, when it is intended to be used in a wet state, it may have a multi-layer structure to improve the strength of the sheet. In this case, for example, in addition to separately forming the surface layer 2 and the inner layer 3 into a two-layer structure, in the illustrated example, the fiber web used as the inner layer 3 is interposed between the fiber webs used as the surface layer 2, or A single-layer inner layer 3 or surface layer 2 may be laminated on the surface layer 2/inner layer 3 having a two-layer structure.

In the present invention, since the content of the long fibers 4 formed of the ultrafine fibers in the surface layer 2 is about 60 to 100% by mass, the non-woven fabric 1 for wipes is compared with the one using this content when the content is less than about 60%. The number of contact points of the object becomes larger, and the skin feels better and the adhesion is excellent. The long fibers 4 may be dispersed in a state of single fibers, or a plurality of single fibers may be aggregated in a bundle to form a fiber assembly (fiber bundle). When the long fibers 4 are aggregated in a bundle shape, large dirt can be captured by the bundle, and the extremely fine long fibers 4 forming the bundle enter the pores to scrape out small dirt and can be trapped inside the bundle, so that the wiping property is improved.

Referring to Figures 6 and 7, if the non-woven cloth 1 for wipes is used The structure of the cotton pad 10 further illustrates that the cotton pad 10 has: a first direction S and a second direction R crossing each other; a first surface 11 and a second surface 12 located on the opposite side thereof; in the first direction S The upper and lower side edges 13, 14; the two end edges 15, 16 extending in the second direction R; the first end 17 and the second end 18 that are separated from each other in the first direction S; And the intermediate portion 19 between the second end portions 17 and 18. In the middle portion 19, the width in the second direction R is fixed, and in the first and second end portions 17, 18, the side edges 13, 14 are reduced toward the end edges 15, 16 with the size of the second direction R, respectively. Tilted. The covering sheet 21 is laminated so as to wrap around the buffer material layer 20, and in order to maintain such a layered state, the portions where the two bonding portions 45 and 46 are laminated along both side edges are bonded to each other. With the covering sheet 21 maintaining such a stacked state, an openable and closable pocket 50 having an opening edge portion 51 extending in the second direction R is formed between the two joining portions 45 and 46. The size L1 of the cotton pad 10 in the first direction S is about 45 to 65 mm, the size in the second direction R is about 65 to 85 mm, and the size of the middle portion 19 in the first direction S is formed to be larger than the first and second The dimensions of the ends 17, 18 in the first direction S are larger.

The mass of the cushioning material layer 20 in the cotton pad 10 is preferably about 0.2 to 0.4 g. The cushion material layer 20 is preferably smaller in mass per unit area in the intermediate portion 19 than in the first and second end portions 17 and 18. In addition, the mass per unit area of the first and second end portions 17 and 18 of the buffer material layer 20 may be set to be almost the same or different. In this embodiment, the first and second end portions 17 and 18 The mass per unit area is almost equal. Also, for example, the unit per area of the first end 17 of the buffer layer 20 The mass is set to be larger than that of the second end 18, and when the pocket 50 inserts a finger from its opening edge 51 to use the cotton pad 10, the end inserted into the side of the finger (the first end 17 ) Improves the softness and makes the skin feel soft.

The buffer material layer 20 is a fiber assembly mainly composed of hydrophilic fibers, and as long as the fiber assembly does not hinder the water absorption required by the buffer material layer 20, hydrophobic fibers may be mixed. Specifically, it contains about 80% by mass or more of hydrophilic fibers. As the hydrophilic fiber, for example, rayon fiber, cotton fiber, acrylonitrile fiber and the like can be used. For hydrophobic fibers, for example, synthetic fibers formed of synthetic resins such as polyethylene, polyester, and polypropylene; or synthetic fiber composite fibers formed of such synthetic resins can be used. In this embodiment, the cushioning material layer 20 is formed of a fiber assembly mainly composed of rayon fibers. When using rayon fiber as a hydrophilic fiber, it can improve the water repellency when using a lotion for impregnation compared with cotton fiber.

In addition, the fibers forming the outer layer 24 are long fibers 4. When the fiber length is relatively large, for example, when it is larger than the size in the first direction S and/or the second direction R of the cotton pad 10, in the first and second The surfaces 11 and 12 have no end portions of fibers. When the outer layer 24 is formed of short fibers 5 existing at the end portions of the fibers of the first and second surfaces 11, 12 and the cotton pad 10 is used, although the end portion may cause irritation when touching the skin, however, Using the long fibers 4 continuous on the first and second surfaces 11 and 12 so that the end portion does not exist except for the outer peripheral portion of the cotton pad 10 can improve the feel of the skin compared to when using short fibers. This embodiment The cotton pad 10 in FIG. 2 has a joint 44 formed on the inner sides of the side edges 13 and 14 of the cotton pad 10 covering the cutting line of the sheet 21. Therefore, in the second face 12, the joint 44 There is no good skin feel at the end of the long fiber 4 at the end of the long fiber 4 in the cosmetic fluid application area defined by each joint and the end edges 15 and 16.

When the inner layer 23 contains hydrophobic thermoplastic fibers, the hygroscopicity/absorbency of the inner layer 23 is reduced. Therefore, the effect of inhaling the makeup liquid held in the outer layer 24 is suppressed, and the skin can be brought into contact with the surface side. The liquid residue is further improved. In addition, when the covering sheets 21 laminated in the joining portions 45 and 46 are joined by embossing/recessing by heat or ultrasound, it is desirable that when the inner layers facing each other are joined while welding The inner layer 23 of the 23 and the outer layer 24 is a non-welding rayon fiber, and there is a concern that the bonding strength may become low. Since the inner layer 23 contains thermoplastic fibers, welding of the inner layer 23 and the outer layer 24 becomes easier, and the bonding strength in the bonding portion 44 is improved, which prevents the part from peeling off during use.

[Example]

Although the examples and the like of the present invention will be specifically described below, the present invention is not limited by the following examples.

[Example 1]

Non-woven cloth for wipes: thickness 0.25mm, mass per unit area 30g/m ²

Surface layer: thickness 0.09 mm, mass per unit area 10 g/m ² , melt-blown nonwoven fabric (Neon 6: 100% by mass), average fiber diameter of long fibers 4 μm

Inner layer: thickness 0.16mm, mass per unit area 20g/m ² , water needle non-woven fabric (short fiber: rayon; 80% by mass, heat-fusible fiber; 20% by mass), short fiber (rayon and heat fusion The average fiber diameter is 16μm

[Example 2]

Non-woven cloth for wipes: thickness 0.25mm, mass per unit area 30g/m ²

Surface layer: thickness 0.09 mm, mass per unit area 10 g/m ² , melt-blown nonwoven fabric (Neon 6: 100% by mass), average fiber diameter of long fibers 4 μm

Inner layer: thickness 0.16mm, mass per unit area 20g/m ² , rayon fiber (rayon: 100% by mass), average fiber diameter of short fiber (rayon) 15μm

[Comparative Example 1]

Non-woven fabric (single layer) for wipes: thickness 0.27mm, mass per unit area 30g/m ² , melt-blown non-woven fabric (Neon 6: 100% by mass), average fiber diameter of long fiber 4μm

[Comparative Example 2]

Non-woven fabric for wiping towels (single layer): thickness 0.25mm, mass per unit area 30g/m ² , water needle non-woven fabric (cotton: 100% by mass), average fiber diameter 15μm

[Comparative Example 3]

Non-woven fabric for wiping wipes (single layer): thickness 0.25mm, mass per unit area 30g/m ² , water needle non-woven fabric (Yuan: 100% by mass), average fiber diameter 15μm

For each of the examples and comparative examples, in addition to measuring the average surface friction coefficient (MIU), the average deviation of the surface friction coefficient (MMD), and the average deviation of the surface roughness (SMD) in terms of surface characteristics, a wipe test and functional test. Table 1 shows the measurement results and test results. this In addition, this measurement is based on the generally known characteristic values of KES manufactured by Kado Technology Co., Ltd. of Japan (Reference: Standardization and Analysis of Feel Evaluation (Second Edition)), published by Kawabata Jixiong on July 10, 1985 ) The measurement is performed as a characteristic value indicating the non-woven skin feel.

The measurement method of each measurement item shown in Table 1 and the evaluation criteria in each test item are as follows. In addition, the results of each test are A (excellent), B (good), and C (normal). D (poor) is evaluated.

<Measurement method of surface characteristics>

The surface characteristics were measured by using KES-FB4 manufactured by Japan Kado Technology Co., Ltd., taking the 1.0cm×1.0cm range in the cosmetic application area of each sample as the sample, and placing the part as the sample on the surface Measurement is made on a metal test stand. The measurement of the surface roughness is to apply a load of 10 gf to the surface of the sample, and for the contact terminal, use a 0.5 cm wide coiled piano wire with a diameter of 0.5 mm. In addition, the measurement of the surface friction was performed by pressing a 50 gf force on a contact piece of 10 piano wires arranged with a diameter of 0.5 mm and pressing the contact surface of the contact piece to the sample. Surface friction and surface roughness are measured by moving the sample horizontally by 2 cm at a speed of 0.1 cm/sec, and applying a uniaxial tension of 20 gf/cm to the sample. The characteristic values were measured for the first direction X and the second direction Y of each sample, and the average was obtained.

≪Evaluation criteria≫ 1. The value of average surface friction coefficient (MIU)

A: 0.25 or more

B: more than 0.20, less than 0.25

C: more than 0.15, less than 0.20

D: Other than this

2. Mean Deviation of Surface Friction Coefficient (MMD)

A: below 0.0080

B: More than 0.0080 and less than 0.0090

C: More than 0.0090 and less than 0.0100

D: More than 0.0100

3. The value of the average deviation of surface roughness (SMD) [μm]

A: Below 4.0

B: More than 4.0 and less than 4.5

C: More than 4.5 and below 5.0

D: More than 5.0

<wiping test>

Using the nonwoven fabric 1 for wipes of the present invention and the nonwoven fabric of the comparative example, a wipe test of a cosmetic (foundation) was performed. As the test device, a friction and friction measuring device TL201Ts manufactured by Trinity-Lab Inc. was used. In addition, the non-woven fabric and the non-woven fabric 1 for wipes which are comparative examples of the sample were tested without applying a liquid such as a cosmetic liquid. First, on the surface of a rectangular glass slide with a width of 26 mm and a length of 90 mm, a 0.02 g cosmetic with a circular shape of 13 mm in diameter was applied as a test piece from the longitudinal edge to a position of 20 mm. Next, the nonwoven fabric 1 for wipes as a sample was sandwiched between the dedicated jig (20 mm deep and 70 mm wide) of the test device with the surface 1 a as the exposed surface, and the test piece was applied for 40 minutes after applying the cosmetic The special jig applies a certain load (a load of 100 g is applied to the area of 5.2 cm ^{2 of the} nonwoven fabric 1 for wipes in contact with the test piece) while wiping the cosmetics at a moving speed of 2.5 mm/s from the edge of the test piece by 60 mm. In addition, in this measurement, generally widely distributed foundations are used as cosmetics (for example, those containing preservatives, surfactants, ultraviolet absorbers, tar-based pigments, artificial fragrances, etc.).

Next, the surface of the test piece after the cosmetic was wiped was read with a scanner (GT-X750 manufactured by Seiko Epson Co., Ltd.), and then the image was read using image software (Adobe Photoshop Elements 3.0), and the histogram processing was performed using Histgram Analysis software. , And binarization. The value of the binarization treatment of the test piece before wiping the cosmetics was set to 100, and the value of the binarization treatment of the test piece after wiping was expressed as a ratio as the wiping rate. The number of samples in each case was set to N=3, and the average value was calculated.

<Evaluation method>

A: The wiping rate is over 90%

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

C: The wiping rate is more than 70% and less than 80%

D: The wiping rate is less than 70%

<functional evaluation>

Soak in distilled water 3 times the dry mass of the non-woven fabric Each wipe of 12cm×12cm is made of non-woven fabric to prepare a wet sheet, and 10 female functional inspectors regard the "softness", "smoothness" and "wiping feeling" of the wet sheet when each wet sheet is used to wipe the foundation coated on the face "Evaluate in four stages.

1. Softness

A: Soft

B: Slightly soft

C: cannot be clearly determined

D: Not soft

2. Smooth

A: Smooth

B: A little smooth

C: cannot be clearly determined

D: No smoothness

3. Wiping feeling

A: There is a sense of wiping

B: There is a slight wiping feeling

C: cannot be clearly determined

D: No wiping feeling

(Measurement result)

As shown in Table 1, the nonwoven fabric 1 for wipes of Examples 1 and 2 On the surface 1a side, the average surface friction coefficient (MIU) is 0.25 or more, the average deviation of surface friction coefficient (MMD) is 0.008 or less, and the average deviation of surface roughness (SMD) [unit: μm] is 4.0 or less. On the other hand, the nonwoven fabric for wipes of Comparative Example 1 has a MIU of 0.25 or less, MMD of 0.008 or less, and SMD of 5.0 or less, and the nonwoven fabric of Comparative Example 2 has a MIU of less than 0.20, MMD of 0.008 or less, and SMD of 4.0 or less, the nonwoven fabric for wipes of Comparative Example 3 has a MIU of less than 0.20, an MMD of more than 0.100, and an SMD of 5.0 or less. In addition, in the wiping test, the non-woven fabric for wipes 1 of Examples 1 and 2 and the non-woven fabric for wipes of Comparative Example 1 indicate that the wiping rate is 90% or more, and exceeds 90% when no cosmetic liquid is applied High wiping rate. On the other hand, the nonwoven fabric for wipes of Comparative Examples 2 and 3 had a wiping rate of less than 80%.

Based on the results of such measurement and evaluation, the nonwoven fabric 1 for wipes of Examples 1 and 2 spreads in an irregular arc by drawing irregular arcs on the surface 1a side by the long fibers 4, the surface 1a side is relatively smooth, and the makeup liquid When a liquid such as is supplied to the surface 1a side, the liquid can diffuse uniformly throughout the surface 1a to form a uniform liquid film. In addition, the nonwoven fabric 1 for wipes of Examples 1 and 2 includes long fibers 4 made of ultrafine fibers, so that a small number of edge portions are formed on the surface 1a side. Since it has relatively high friction resistance, it is treated It is excellent in performance and can wipe out tiny dirt that has entered the pores.

In this way, the nonwoven fabric 1 for wipes of Examples 1 and 2 is formed by long fibers 4 made of ultrafine fibers, and its surface 1a is relatively smooth and has high friction resistance. Therefore, even in functional evaluation, "soft The evaluation of "degree", "smooth feeling" and "wiping feeling" is "A", and the sheet characteristics of such a nonwoven fabric 1 for wipes can be actually confirmed in terms of use feeling. On the other hand, the nonwoven fabrics for wipes of Comparative Examples 1 to 3 have uneven surfaces and low friction resistance. Therefore, a uniform liquid film is formed as in Examples 1 and 2, or sufficient wiping function cannot be exerted , Of all the functional evaluation items, there is no evaluation to become "A".

In addition to the materials described in this specification, the materials constituting the wipe nonwoven fabric 1 of the present invention can be used without limitation to various well-known materials generally used for such articles. In the description and patent application scope, the terms "first", "second", and "third" are used only to distinguish the same elements, positions, and so on.

The above disclosure about the present invention can at least summarize the following matters.

A non-woven fabric having: a first direction and a second direction crossing this; a surface layer, which is mainly composed of hygroscopic long fibers with an average fiber diameter of 10 μm or less; and an inner layer, which is composed of an average The non-woven fabric mainly composed of short fibers with a fiber diameter of more than 10 μm is characterized in that, in the surface layer, the long fibers are irregularly drawn in an arc and diffused uniformly in a mesh shape, and the first layer is formed in the first direction In the plurality of openings arranged, the long fiber spans at least a part of the openings.

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

(1) The inner surface layer further has a plurality of grooves and a plurality of ridges extending in the first direction, and the grooves and the ridges are in the second The directions are alternately arranged, and the plurality of openings are formed in the groove portion.

(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 inner layer.

(3) The wiping rate of the aforementioned surface layer in the dry state is at least 80%.

(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 aforementioned long fiber is Nylon.

(6) The short fiber is a fiber with higher hygroscopicity than the long fiber.

(7) The aforementioned short fibers are at least one of rayon and cotton-containing cellulose fibers.

(8) The water needle nonwoven fabric in which the surface layer and the inner layer are integrated by the water flow interlacing method.

1‧‧‧nonwoven

1a‧‧‧surface

4‧‧‧Long fiber

2‧‧‧Surface layer

80‧‧‧opening

81‧‧‧Spine

82‧‧‧ Ditch Department

1b‧‧‧In

3‧‧‧Inner layer

5‧‧‧ staple fiber

X‧‧‧ 1st direction

Y‧‧‧ 2nd direction

Claims (9)

A wiping sheet having: a first direction and a second direction crossing this; a surface layer composed mainly of long fibers with hygroscopicity having an average fiber diameter of 10 μm or less; and an inner layer, which is The wiping sheet composed mainly of short fibers with an average fiber diameter of more than 10 μm is characterized in that, in the surface layer, the long fibers are irregularly drawn in an arc and diffused uniformly in a mesh shape, and the inner layer is formed with In the plurality of openings arranged in the first direction, the long fiber spans at least a part of the openings. The wiping sheet according to item 1 of the patent application scope, wherein the back layer further has a plurality of grooves and a plurality of ridges extending in the first direction, the grooves and the ridges are alternately arranged in the second direction, The plurality of openings are formed in the groove. The wiping sheet as described in item 1 or 2 of the patent application, wherein 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 the thickness of the back layer 60% size. The wiping sheet as described in item 1 or 2 of the patent application range, wherein the wiping rate of the surface layer in the dry state is at least 80%. The wiping sheet as described in item 1 or 2 of the patent application, wherein the average surface friction coefficient (MIU) of the surface is 0.25 or more, and the average deviation of surface roughness (SMD) is 4.0 μm or less. The wiping sheet as described in item 1 or item 2 of the patent application, wherein the long fiber is nylon. The wiping sheet as described in item 1 or 2 of the patent application, wherein the short fiber is a fiber having higher hygroscopicity than the long fiber. The wiping sheet as described in item 1 or 2 of the patent application, wherein the short fiber is at least one of rayon and cotton-containing cellulose fiber. The wiping sheet as described in item 1 or 2 of the patent application, wherein the water needle nonwoven fabric in which the surface layer and the back layer are integrated by a water flow interlacing method.

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