WO2021192985A1

WO2021192985A1 - Nonwoven fabric, method for producing same, sheet impregnated with liquid, and wiping sheet

Info

Publication number: WO2021192985A1
Application number: PCT/JP2021/009123
Authority: WO
Inventors: 章弘松尾; 和之中山; 直晃守谷; 徹落合
Original assignee: クラレクラフレックス株式会社
Priority date: 2020-03-24
Filing date: 2021-03-09
Publication date: 2021-09-30
Also published as: CN115335562A; TW202203809A; JPWO2021192985A1; KR20220147665A

Abstract

The present invention provides: a nonwoven fabric; a method for producing this nonwoven fabric; a sheet impregnated with a liquid; and a wiping sheet. This nonwoven fabric (10) contains cellulose fibers (13), bonded sheath-core type composite fibers (11) and non-bonded sheath-core type composite fibers (14); the content of the bonded sheath-core type composite fibers relative to the total mass of the nonwoven fabric is from 5% by mass to 20% by mass; the content of the cellulose fibers relative to the total mass of the nonwoven fabric is not less than 45% by mass but less than 90% by mass; the bonded sheath-core type composite fibers have bonded parts at intersection points at which fibers intersect with each other and are bonded with each other; and the non-bonded sheath-core type composite fibers contain an ethylene-vinyl alcohol copolymer in sheath parts.

Description

Non-woven fabric and its manufacturing method, as well as liquid impregnated sheet and wipe sheet

Related application

This application claims the priority of Japanese Patent Application No. 2020-53332 filed in Japan on March 24, 2020, and is cited as a part of this application by reference in its entirety.

The present invention relates to non-woven fabrics, liquid impregnated sheets and wipe sheets.

In recent years, liquid-containing sheets in which a non-woven fabric is impregnated with a liquid have been used because they can be easily used, and these are used as liquid-impregnated sheets in face masks, coating sheets, wiping sheets, and the like. ..

Patent Document 1 (Japanese Unexamined Patent Publication No. 2008-26167) describes a non-woven fabric sheet in which a solvent-spun cellulosic fiber having a fiber length of 30 to 60 mm and a core-sheath type composite fiber are entangled with each other. The sheath-type composite fiber is characterized in that the sheath is composed of a sheath and a core, the sheath is an ethylene-vinyl alcohol copolymer, and the core is a hydrophobic resin, and the diameter thereof is 5 μm to 15 μm. Non-woven sheets are disclosed. In this document, it is possible to provide a soft and bulky fiber entanglement by forming a non-woven fabric by a water flow entanglement method in a state where the solvent-spun cellulosic fiber and the core-sheath type composite fiber are uniformly mixed. ..

Patent Document 2 (International Publication No. 2015/046301) discloses a liquid-retaining sheet made of a non-woven fabric containing 50% by mass or more of highly elastic fibers having a Young's modulus of 30 cN / T or more. In this document, it is possible to provide a liquid-retaining sheet and a face mask in which a liquid component such as a beauty essence (cosmetics) is impregnated and the liquid component quickly returns to the sheet even when pressed with a finger.

Japanese Unexamined Patent Publication No. 2008-26167 International Publication No. 2015/046301

However, in Patent Document 1 and Patent Document 2, there is room for improvement because the morphological stability when the non-woven fabric is used is inferior.

Therefore, an object of the present invention is to provide a non-woven fabric having excellent morphological stability, and a liquid-impregnated sheet and a wiping sheet using the non-woven fabric.

Another object of the present invention is to provide a non-woven fabric having excellent morphological stability and a good water retention rate and liquid release rate, and a liquid impregnated sheet and a wiping sheet using the non-woven fabric.

Another object of the present invention is a non-woven fabric in which the non-woven fabrics do not slip easily when folded and used, and the friction between the non-woven fabric and the skin is small and the burden on the skin can be reduced, and liquid impregnation using the non-woven fabric. The purpose is to provide a sheet and a wipe sheet.

As a result of diligent studies to achieve the above object, the inventors of the present invention use the interlining-sheath-type composite fibers in a predetermined ratio from the viewpoint of improving the morphological stability, and between the interlining-sheath-type composite fibers. It has been found that when the interlining portion is formed at the intersection where the fibers are in contact with each other, a pseudo-net state can be formed and the morphological stability of the entire non-woven fabric can be improved.

On the other hand, the improvement of morphological stability by the interlining sheath type composite fiber may not bring about sufficient liquid release property when the non-woven fabric is compressed to the extent that it is applied to the skin, and further, the non-woven fabric may not provide sufficient liquid release property. However, as the space for holding the liquid is reduced, the water retention rate may be lowered. Therefore, it was found as a new issue that improvement of other fibers is required. As a result of diligent studies on this new issue, when a pseudo-net state is formed, the liquid release rate and water retention rate are as follows: cellulosic fiber on the non-woven fabric and ethylene-vinyl alcohol co-weight on the sheath as the third component. The present invention has been completed by finding that it can be controlled by containing a non-adhesive interlining sheath type composite fiber having a coalescence (ethylene-vinyl alcohol: abbreviation EVOH) and setting the ratio of the cellulosic fiber to a specific range. bottom.

That is, the present invention can be configured in the following aspects.
[Aspect 1]
A non-woven fabric containing cellulosic fibers, interlining-sheath type composite fibers and non-adhesive interlining-sheath type composite fibers.
With respect to the total mass of the non-woven fabric
The content of the interlining sheath type composite fiber is 5% by mass or more and 20% by mass or less (preferably 7% by mass or more and 17% by mass or less, more preferably 8% by mass or more and 15% by mass or less).
The content of the cellulosic fiber is 45% by mass or more and less than 90% by mass (preferably 50% by mass or more and less than 90% by mass, more preferably 55% by mass or more and 88% by mass or less, particularly 65% by mass or more and 85% by mass or less). And the adhesive core-sheath type composite fibers have adhesive portions that are bonded at the intersections where they intersect with each other.
The non-adhesive interlining sheath type composite fiber is a non-woven fabric in which the sheath portion contains an ethylene-vinyl alcohol copolymer.
[Aspect 2]
In the non-woven fabric according to the first aspect, the mass ratio of the content (T) of the cellulosic fiber and the content (N) of the non-adhesive interlining sheath type composite fiber is T / N = 99/1 to 51 /. A non-woven fabric of 49 (preferably 95/5 to 55/45, more preferably 95/5 to 65/35, still more preferably 95/5 to 75/25).
[Aspect 3]
The non-woven fabric according to the first or second aspect, wherein the elongation rate when absorbing saturated water content is 40% or less (preferably 35% or less, more preferably 31% or less).
[Aspect 4]
The non-woven fabric according to any one of aspects 1 to 3, impregnated with a mixed solution of distilled water and glycerin (distilled water / glycerin mass ratio = 5/4) in an amount of 500% by mass based on the mass of the non-woven fabric. The compressive hardness at the time of 30% compressive deformation when left for 24 hours is 0.750 to 1.500 N / mm (preferably 0.800 to 1.400 N / mm, more preferably 0.850 to 1.300 N / mm). mm), non-woven fabric.
[Aspect 5]
The non-woven fabric according to any one of aspects 1 to 4, wherein a mixed solution of distilled water and glycerin (distilled water / glycerin mass ratio = 5/4) is impregnated with 500% by mass based on the mass of the non-woven fabric. A non-woven fabric having a liquid discharge rate of 7 to 14% (preferably 8 to 12%) for 10 seconds released at the time of 30% compressive deformation when left for 24 hours.
[Aspect 6]
The non-woven fabric according to any one of aspects 1 to 5, wherein the water retention rate is 1145% or more (preferably 1180% or more, more preferably 1200% or more).
[Aspect 7]
The non-woven fabric according to any one of aspects 1 to 6, wherein the non-woven fabric contains 400% by mass of distilled water and has a coefficient of static friction (A), and the non-woven fabric and bioskin contain 400% by mass of distilled water. The difference (AC) from the coefficient of static friction (C) with (artificial skin) may be 0.0170 to 0.1000 (preferably 0.0200 to 0.0900, more preferably 0.0300). ~ 0.0800), a non-woven fabric.
[Aspect 8]
The non-woven fabric according to any one of aspects 1 to 7, wherein the non-woven fabrics containing 400% by mass of distilled water have a coefficient of static friction (A) of 0.0550 to 0.0900 (preferably 0.0600 to 0.0600 to). A non-woven fabric of 0.0900, more preferably 0.0650 to 0.0880). [Aspect 9]
The non-woven fabric according to any one of aspects 1 to 8 and having a coefficient of static friction (C) of 0.0450 or less (preferably) between the non-woven fabric containing 400% by mass of distilled water and bioskin (artificial skin). Non-woven fabric which is 0.0430 or less).
[Aspect 10]
The non-woven fabric according to any one of aspects 1 to 9, wherein the fluff length per thickness (1 time) of the non-woven fabric is 10 times or less (preferably 8 times or less, more preferably 5 times or less). , Non-woven fabric.
[Aspect 11]
A liquid-impregnated sheet using the non-woven fabric according to any one of aspects 1 to 10.
[Aspect 12]
A wipe sheet using the non-woven fabric according to any one of aspects 1 to 10.
[Aspect 13]
A method for producing a nonwoven fabric according to any one of aspects 1 to 10.
It contains cellulosic fibers, adhesive core-sheath type composite fibers and non-adhesive core-sheath type composite fibers, and the content of the adhesive core-sheath type composite fibers is 5% by mass or more and 20% by mass or less with respect to the total mass of the web. There is a step of performing an entanglement treatment on a web having a cellulosic fiber content of 45% by mass or more and less than 90% by mass to form a web having an entangled structure.
In a web having the entangled structure, a non-woven fabric comprising at least a step of not forming an adhesive portion between the non-adhesive interlining sheath type composite fibers and forming an adhesive portion between the interlining sheath type composite fibers. Production method.
[Aspect 14]
The method for producing a non-woven fabric according to the thirteenth aspect, wherein the entanglement treatment is water-flow entanglement.
[Aspect 15]
The non-woven fabric according to

aspect

13 or 14, which is lower than the melting point of the sheath portion of the non-interlining sheath type composite fiber and higher than the melting point of the sheath portion of the interlining sheath type composite fiber in the step of forming the adhesive portion. A method for producing a non-woven fabric, which is heat-treated at a high temperature.

It should be noted that any combination of claims and / or at least two components disclosed in the specification and / or drawings is included in the present invention. In particular, any combination of two or more of the claims described in the claims is included in the present invention.

In the present invention, it is possible to provide a non-woven fabric having excellent morphological stability, water retention, liquid release property, etc., and particularly preferably, the non-woven fabric and the skin are excellent in handleability while the non-woven fabrics do not slip easily when folded and used. It is possible to provide a non-woven fabric that has little friction with the skin and can reduce the burden on the skin.

The present invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the examples and drawings are for illustration and illustration purposes only and should not be used to define the scope of the invention. The scope of the present invention is determined by the appended claims.
It is a schematic perspective view of the nonwoven fabric which concerns on embodiment of this invention. It is a schematic enlarged plan view which shows a part of the non-woven fabric conceptually. It is a partial schematic enlarged view which shows the part III of FIG. 2 enlarged. FIG. 3 is a partially enlarged view for explaining the adhesive portion of FIG. 3A in an enlarged manner. It is a schematic side view for demonstrating how the liquid discharged from a sample is absorbed by cotton wool in the liquid discharge rate test. FIG. 5 is a schematic plan view showing a sample cut out from the non-woven fabric used when measuring the coefficient of static friction between the liquid-impregnated non-woven fabrics. It is a schematic plan view which shows the friction-affected member cut out from the non-woven fabric used when measuring the static friction coefficient between the liquid impregnated non-woven fabrics. It is a schematic plan view for demonstrating the state of a sample used when measuring the coefficient of static friction between liquid-impregnated nonwoven fabrics. It is a schematic side view for demonstrating the test apparatus used when measuring the coefficient of static friction between liquid-impregnated nonwoven fabrics. FIG. 5 is a schematic plan view showing a sample cut out from the non-woven fabric used when measuring the coefficient of static friction between the liquid-impregnated non-woven fabric and the bioskin plate. It is a schematic plan view which shows the sample cut out from a non-woven fabric used when measuring the fluff length generated from a non-woven fabric by friction. It is a schematic plan view for demonstrating the state of a sample used when measuring the elongation rate of a nonwoven fabric.

The non-woven fabric of the present invention includes a cellulosic fiber, an interlining-sheath type composite fiber having an adhesive portion, and a non-adhesive interlining-sheath type composite fiber whose sheath portion contains an ethylene-vinyl alcohol copolymer.

(Cellulose fiber)
Examples of cellulosic fibers include vegetable fibers such as cotton, hemp and pulp, regenerated fibers such as rayon and cupra, and purified cellulosic fibers such as lyocell (tensel). These cellulosic fibers may be used alone or in combination of two or more. Of these, rayon is preferable because of its easy availability and handling. The cellulosic fibers may be partially fibrillated, but it is desirable that the cellulosic fibers are not substantially fibrillated from the viewpoint of preventing fine fibers from adhering to the face.

The content of cellulosic fibers is 45% by mass or more and less than 90% by mass with respect to the total mass of the non-woven fabric of the present invention. When the content of the cellulosic fiber is less than 45% by mass, the water retention is low. On the other hand, when the content of the cellulosic fiber is 90% by mass or more with respect to the total mass of the non-woven fabric of the present invention, the sheet becomes dense and the liquid release property is lowered. Preferably, the content of the cellulosic fiber may be 50% by mass or more and less than 90% by mass, more preferably 55% by mass or more and 88% by mass or less, particularly 65% by mass, based on the total mass of the non-woven fabric. It may be 85% by mass or less.

The fineness of the cellulosic fiber is not particularly limited, but may be, for example, 1.2 to 2.2 dtex, more preferably 1.5 to 1.9 dtex. The average fiber length of the cellulosic fiber is not particularly limited, but may be, for example, 10 to 100 mm, preferably 20 to 80 mm, more preferably 20 to 80 mm from the viewpoint of manufacturing workability, mechanical properties of the non-woven fabric, and the like. May be 30-60 mm.

(Interlining sheath type composite fiber)
The non-woven fabric of the present invention contains 5% by mass or more and 20% by mass or less of the interlining-sheath type composite fiber with respect to the total mass of the non-woven fabric, and the interlining-sheath type composite fiber is bonded at the intersection where they intersect with each other. Has an interlining. At the bonded portion, the sheath portions of the fibers can be fused and integrated with each other, so that good morphological stability can be imparted.

By containing the interlining sheath type composite fiber in a predetermined ratio, the adhesive portion can be formed in a suitable range, and the morphological stability of the non-woven fabric can be improved. Further, in the adhesive portion, the sheath portions of the interlining sheath type composite fibers are compatible with each other to form a pseudo-net state in which the interlining sheath type fibers are integrated. Therefore, when the non-woven fabric is rubbed, fluff is generated. It can be suppressed from occurring. The content of the interlining sheath type composite fiber may be preferably 7% by mass or more and 17% by mass or less, and more preferably 8% by mass or more and 15% by mass or less.

The interlining sheath type composite fiber is composed of a resin component forming a core portion and a resin component forming a sheath portion, and the sheath portion has adhesiveness. Various resin components can be used for the sheath portion as long as an adhesive portion can be formed, but from the viewpoint of workability, the sheath portion preferably has heat-sealing properties. Preferred sheaths include heat-sealing polyethylenes and polypropylenes, modified polymers thereof, blends, polyolefin resins such as copolymers, modified polyesters (eg, modified polyethylene terephthalates modified with isophthalic acid) and the like. The preferred examples are polyethylene and modified polymers of polyethylene, blends, copolymers, modified polyethylene terephthalates and the like.
For example, when a heat-sealing resin is used as the sheath portion, the melting point of the heat-sealing resin may be, for example, 80 to 150 ° C., preferably 100 to 140 ° C.

On the other hand, the core portion can be made into a fiber with the sheath portion forming the adhesive portion, and is not particularly limited as long as the use as a fiber can be maintained even when the sheath portion forms the adhesive portion, depending on the sheath portion. A suitable resin component is selected. Preferred cores include, for example, polyolefin-based resins such as polypropylene and polyester-based resins such as polyethylene terephthalate. When a heat-sealing resin is used as the sheath, the melting point of the resin component of the core may be, for example, 10 ° C. or higher higher than the melting point of the sheath resin component, preferably 20 ° C. or higher. , More preferably, the temperature may be higher than 30 ° C.

For example, as the core / sheath combination, a combination of polyethylene terephthalate / polyethylene, polyethylene terephthalate / modified polyethylene terephthalate, polypropylene / polyethylene, polypropylene / modified polypropylene and the like is suitable. Of these, a polypropylene / polyethylene combination, which is inexpensive and is generally used for non-woven fabrics, is preferable.

From the viewpoint of forming a strong adhesive portion, it is preferable that the low melting point component to be the sheath portion covers at least 40% or more, particularly 60% or more of the circumference of the core portion in the interlining sheath type composite fiber. The composition ratio of the core portion and the sheath portion may be, for example, 90/10 to 10/90, preferably 80/20 to 20/80, and more preferably 70/30 to 30/90 in terms of mass ratio. It may be 70.

The cross-sectional shape of the adhesive interlining sheath type composite fiber is not particularly limited, and may be any form such as a round interlining sheath, an eccentric interlining sheath, and a modified cross-sectional core sheath. From the viewpoint of improving morphological stability, the fineness of the interlining sheath type composite fiber may be, for example, 0.5 to 10.0 dtex, preferably 1.0 to 5.0 dtex, and more preferably 1.4. It may be ~ 2.2 dtex. The average fiber length of the interlining sheath type composite fiber is preferably in the range of, for example, 10 mm to 80 mm from the viewpoint of manufacturing workability, mechanical properties of the non-woven fabric, and the like. It is more preferably 30 mm to 70 mm, and even more preferably 35 mm to 60 mm. By using such short fibers in the interlining-sheath type composite fiber, it is possible to improve the mechanical properties such as the strength and elongation of the non-woven fabric while increasing the mobility and the degree of entanglement of the fibers by the entanglement treatment.

(Non-interlining sheath type composite fiber)
In addition to the cellulosic fibers, the non-woven fabric of the present invention contains a non-adhesive interlining sheath type composite fiber having a resin having both hydrophilicity and lipophilicity as a sheath portion. That is, as the resin having both hydrophilicity and lipophilicity, the sheath portion contains ethylene-vinyl alcohol copolymer (abbreviated symbol EVOH). Unlike the interlining-sheath type composite fiber, in the non-adhesive interlining-sheath type composite fiber, the ethylene-vinyl alcohol copolymers, which are the sheath portions, are present in the non-woven fabric without being compatible with each other, and such non-adhesive. Due to the presence of the interlining-sheath type composite fiber, the non-woven fabric can improve the elasticity.

The EVOH used for the sheath portion of the non-adhesive interlining sheath type composite fiber of the present invention is preferably obtained by saponifying an ethylene-vinyl ester copolymer. It is preferable to use an EVOH component having an ethylene content of 25 to 70 mol%. From the viewpoint of achieving both hydrophilicity and lipophilicity, those having an ethylene content of 30 to 65 mol% are particularly preferable.

By using a non-adhesive interlining sheath type composite fiber using EVOH as the sheath portion, the liquid retention property (water retention) when the non-woven fabric contains a liquid component can be improved, and when the non-woven fabric is compressed to about 30%. The liquid release property can be improved.

In the non-adhesive interlining sheath type composite fiber, the core portion is not particularly limited as long as it is a resin component that can be fibrous with EVOH, but is preferably hydrophobic from the viewpoint of imparting rigidity to EVOH having hydrophilicity. It may be a sex resin component.

Examples of the hydrophobic resin component include polyester resins such as polyethylene terephthalate, polyolefin resins such as polypropylene, and polyamide resins. Polypropylene and polyester resins are preferable from the viewpoint of higher rigidity than EVOH, and polyester resins are preferable from the viewpoint of having a higher elastic modulus and improving the morphological stability of the non-woven fabric.

By using the non-adhesive interlining sheath type composite fiber, it is possible to form a space for holding the liquid in the non-woven fabric, and it is possible not only to control the liquid release property but also to be non-adhesive. The friction between the non-woven fabric and the skin is small and the burden on the skin can be reduced. Further, even when compressed to about 30%, it is possible to impart a suitable compression hardness to the non-woven fabric, which is neither too hard nor too soft.

From the viewpoint of imparting both hydrophilicity and lipophilicity to the fiber surface and controlling the liquid release property, in the non-adhesive interlining sheath type composite fiber, EVOH as a sheath portion is at least 50% or more around the core portion, particularly 70. It is preferable to cover% or more. The composition ratio of the core portion and the sheath portion may be, for example, 90/10 to 10/90, preferably 80/20 to 20/80, and more preferably 70/30 to 30/90 in terms of mass ratio. It may be 70.

The cross-sectional shape of the non-adhesive interlining sheath type composite fiber is not particularly limited, and may be any form such as a round interlining sheath, an eccentric interlining sheath, and a modified cross-sectional core sheath. The fineness of the non-adhesive interlining sheath type composite fiber may be, for example, 0.5 to 10.0 dtex, preferably 1.0 to 5.0 dtex, and more preferably 1 from the viewpoint of process passability and touchability. It may be .4 to 2.2 dtex. The average fiber length of the non-adhesive interlining sheath type composite fiber is preferably in the range of, for example, 10 mm to 80 mm from the viewpoint of manufacturing workability, mechanical properties of the non-woven fabric, and the like. It is more preferably 30 mm to 70 mm, and even more preferably 35 mm to 60 mm. By using such short fibers in the interlining-sheath type composite fiber, it is possible to improve the mechanical properties such as the strength and elongation of the non-woven fabric while increasing the mobility and the degree of entanglement of the fibers by the entanglement treatment.

The content of the non-interlining sheath type composite fiber is, for example, T / N = 99 / as a mass ratio of the content (T) of the cellulosic fiber and the content (N) of the non-adhesive interlining sheath type composite fiber. It may be 1 to 51/49, preferably 95/5 to 55/45, more preferably 95/5 to 65/35, and even more preferably 95/5 to 75/25.

FIG. 1 is a perspective conceptual diagram for explaining a non-woven fabric according to an embodiment of the present invention, and FIG. 2 is an enlarged plan conceptual diagram conceptually showing a part of the non-woven fabric. FIG. 3A is a partially enlarged view showing an enlarged part III of FIG. 2, and FIG. 3B is a partially enlarged view for explaining the bonded portion of FIG. 3A in an enlarged manner.

As shown in FIG. 1, the non-woven fabric 10 of the present invention contains a cellulosic fiber 13, an interlining sheath type composite fiber 11, and a non-adhesive interlining sheath type composite fiber 14. These

fibers

11, 13 and 14 may be randomly arranged in the non-woven fabric, or may be mainly arranged in any one direction (for example, the MD direction). In the non-woven fabric 10, the adhesive interlining sheath type composite fibers 11 are adhered to each other at the intersections where they intersect with each other to maintain the shape of the non-woven fabric.

FIG. 2 is an enlarged plan view that conceptually enlarges a part of FIG. 1, and explains the existence state of the interlining-sheath type composite fiber 11 and the non-adhesive interlining-sheath type composite fiber 14 in the non-woven fabric. In FIG. 2, the interlining sheath type composite fiber 11 and the non-interlining sheath type composite fiber 14 are conceptually illustrated as linear objects. Although the cellulosic fibers 13 are also distributed as linear objects in the non-woven fabric, they are not shown as linear objects in the drawing. Although it is shown as a straight line in the figure for convenience, any fiber may be a curved line.

As shown in FIG. 2, the interlining sheath type composite fiber 11 has an adhesive portion 12 that is adhered to each other at an intersection with another interlining sheath type composite fiber 11. On the other hand, the non-adhesive interlining-sheath type composite fibers 14 are not adhered to each other at the intersection with the other non-adhesive interlining-sheath type composite fibers 14.

At the intersection of the interlining-sheath type composite fiber 11 and the non-adhesive interlining-sheath type composite fiber 14, it may appear that the interlining-sheath type composite fiber is bonded to each other due to the appearance of the interlining-sheath type composite fiber. No interlining is formed that is compatible with each other. Further, even at the intersection of the interlining-sheath type composite fiber 11 and the cellulosic fiber 13, usually, an adhesive portion compatible with each other is not formed at the intersection.

As shown in FIG. 2, the adhesive portions 12 are interfiber-bonded at the intersections where the interlining-sheath

type composite fibers

11 and 11 intersect with each other, and a plurality of the adhesive portions 12 are evenly present throughout the web. In other words, the plurality of adhesive portions 12 are distributed substantially uniformly over the entire web. In each of the adhesive portions 12, interfiber bonds are formed by fusing or welding a part of the sheath portions 11a (the portions of the intersections that come into contact with each other) of the interlining-sheath type composite fibers 11 that intersect each other.

Therefore, the adhesive portion 12 can form a fixed point fixed in the non-woven fabric, unlike mere physical entanglement. Therefore, for example, even when the non-woven fabric is pulled, the morphological stability of the non-woven fabric can be improved by using the adhesive portion 12 as a gripping portion. In addition, since the adhesive portions 12 that are close to each other can form a pseudo-net state, it is possible to suppress excessive stretching during use.

Specifically, as shown in FIGS. 3A and 3B, the adhesive core sheath type composite fiber 11 is a composite fiber including a sheath portion 11a and a core portion 11b covered by the sheath portion 11a, and is one bond. The adhesive portion 12 is formed at the intersection of the sheath portion 11a of the core-sheath type composite fiber 11 and the sheath portion 11a of another adhesive core-sheath type composite fiber 11. The sheath portion is not particularly limited as long as it has adhesiveness. For example, in the case of a heat-sealing core-sheath type composite fiber, the adhesive core-sheath type composite fiber 11 is provided with a low melting point component as the sheath portion 11a and has a core. A high melting point component is applied as part 11b.

The adhesive core sheath type composite fiber 11 has a cross-sectional shape seen by cutting the adhesive core sheath type composite fiber 11 in a plane perpendicular to the longitudinal direction, and has a circular shape on the outer peripheral surface of the core portion 11b in the circumferential direction. It is in the form of a round core sheath covered with a cylindrical sheath portion 11a having a substantially uniform wall thickness. However, as described above, the cross-sectional shape of the adhesive interlining sheath type composite fiber is not limited to the form of the round core sheath, and may be any form such as an eccentric type core sheath and a modified cross-sectional type core sheath. ..

The non-woven fabric of the present invention may contain fibers other than the above-mentioned cellulosic fibers, interlining-sheath type composite fibers and non-adhesive interlining-sheath type composite fibers as long as the effects of the present invention are not impaired. Examples of such fibers include polyester fibers, polyolefin fibers, polyamide fibers, acrylic fibers, polyvinyl alcohol fibers and the like.

[Manufacturing method of non-woven fabric]
From the viewpoint of mixing fibers and securing a space for impregnating the liquid, the non-woven fabric forms a web by a dry method using the various fibers described above, then entangles the fibers in the web by an entanglement treatment, and further adheres by an adhesive treatment. It can be obtained by a method of forming an adhesive portion on a core-sheath type composite fiber.

Specifically, the cellulosic fiber, the interlining sheath type composite fiber, and the non-adhesive interlining sheath type composite fiber are mixed and then defibrated by carding with a card machine to prepare a web. Such a web may be a parallel web in which fibers are arranged in the traveling direction of the card machine, a cross web in which parallel webs are cross-laid, a random web in which the parallel webs are arranged randomly, or a semi-random web in which the fibers are arranged in a medium amount. Although it is good, a random web is preferable in consideration of the fact that the sheet can be used in all directions, and a semi-random web is preferable in consideration of high productivity.

The entanglement treatment is not particularly limited as long as the fibers can be entangled with each other, but from the viewpoint of enabling fine entanglement between the fibers, it is preferable to perform water flow entanglement on the obtained web. In the water flow entanglement treatment, for example, the water flow jetted in a columnar shape at high pressure collides with the web placed on the porous support member described later, and the constituent fibers of the web are precisely three-dimensionally entangled and integrated. To make it.

When three-dimensional entanglement is applied to the web, a method in which the web is placed on a moving porous support member and treated once or multiple times with a water flow having a water pressure of 0.5 to 15 MPa is preferably mentioned. It is preferable that the injection holes are arranged in a row of nozzle plates in a direction orthogonal to the traveling direction of the web so that the water flow uniformly collides with the web. In order to improve the uniformity of the thickness of the web, the water pressure should be in the range of 1.5 to 12 MPa, and the water flow entanglement treatment should be applied to both sides of the web at least twice, and at least 5 times in total. It is preferable to do so. From the viewpoint of making the entanglement with the web uniform, the distance between the injection hole and the web is preferably 1 to 10 cm. Further, the water flow may be injected from, for example, a nozzle plate in which injection holes having a hole diameter of 0.05 to 0.10 mm and an interval of 0.30 to 1.50 mm are arranged in one or two rows.

As the porous support member on which the web is placed, for example, a mesh screen made of metal or resin, a perforated plate, or the like is used. From the viewpoint of improving the flatness of the surface of the non-woven fabric, it is preferable that the water flow is entangled on the woven structure of fine fibers (for example, a plain weave structure) at least in the final treatment of the water flow entanglement treatment.

Further, in order to improve the surface flatness of the web, among the nozzle plates used in the water flow entanglement treatment on the porous support member, the nozzle plate used in the final stage has a pore diameter of 0.05 to 0.10 mm. It is preferable that the injection holes having an interval of 0.30 to 1.00 mm are arranged in one or two rows.
<Adhesion process>
In the bonding step, the entangled structure in the web is maintained, and the bonding portion is formed between the interlining-sheath type composite fibers. The bonding step can be appropriately selected according to the resin component used in the bonding portion between the bonding core-sheath type composite fibers. For example, the bonding portion under a solvent in which only the sheath portion of the bonding core-sheath type composite fiber is softened. Or a heat-sealed core sheath type composite fiber may be used to melt the sheath portion by heat treatment to form an adhesive portion. From the viewpoint of convenience, the bonding process by heat treatment is preferable.

When heat treatment is performed, the temperature and the like are not particularly limited as long as the temperature and the like can be controlled so as not to form the adhesive portion in the non-adhesive interlining sheath type composite fiber while forming the adhesive portion with respect to the interlining sheath type composite fiber, and hot air drying is performed. It is possible to use various dryers such as a machine and a cylinder dryer. In the heat treatment step, the amount of heat may be adjusted so that the temperature of the web becomes higher than the melting point of the sheath portion of the interlining sheath type composite fiber contained in the web. The web on which the adhesive portion is formed can be used as the non-woven fabric of the present invention.

In the case of the heat-sealed core-sheath type composite fiber, a cooling step may be further performed to fix the bonded portion. In the cooling step, cooling may be performed by releasing heat from the web by appropriately adjusting the time until winding after the heat treatment step, or cooling may be performed by using a cooling means. In order to fix the bonded portion and improve the morphological stability of the web and the prevention of fluffing, it is preferable to wind the web after the temperature of the web becomes equal to or lower than the melting point temperature of the sheath portion of the heat-sealed core sheath type composite fiber. ..

[Non-woven fabric]
The non-woven fabric of the present invention is a non-woven fabric containing a cellulose-based fiber, an adhesive core-sheath type composite fiber and a non-adhesive core-sheath type composite fiber, and the adhesive core-sheath type composite fiber is bonded at an intersection where they intersect with each other. The content of the adhesive core-sheath type composite fiber is 5% by mass or more and 20% by mass or less, and the content of the cellulose-based fiber is 45% by mass or more and 90% by mass with respect to the total mass of the non-woven fabric. The non-adhesive core sheath type composite fiber is a non-woven fabric having a sheath portion containing an ethylene-vinyl alcohol copolymer.

From the viewpoint of liquid retention of the non-woven fabric, the apparent density of the non-woven fabric may be, for example, in ^{the range of 0.04 to 0.20 g / cm 3} , preferably 0.06 to 0.15 g / cm ³ . It may be within the range. Here, the apparent density is a value obtained by dividing the basis weight of the non-woven fabric by the thickness. If the apparent density of the non-woven fabric is too low, the morphological stability tends to decrease, and if the apparent density of the non-woven fabric is too high, the amount of liquid retained tends to decrease. The apparent density of the non-woven fabric constituting the sheet of the present invention ^{can be calculated from the amount of grain (g / m 2} ) and the thickness (mm) (the apparent density of the non-woven fabric (g / cm ³ ) = the amount of grain (g / cm 3). g / m ² ) / thickness (mm) / 1000). The thickness of the non-woven fabric is measured according to 6.2 of JIS L 1913 "General non-woven fabric test method".

The basis weight of the non-woven fabric may be, for example, in ^{the range of 10 to 100 g / m 2} , preferably in the range of 20 to 100 g / m ² , and more preferably in the range of 25 to 50 g / m ^2. good. If the basis weight of the non-woven fabric is too low, the morphological stability tends to decrease, and curling or the like tends to occur when the non-woven fabric is used as a liquid impregnated sheet. If the basis weight of the non-woven fabric is too large, it tends to occur. The amount of fibers used per sheet and the amount of impregnating liquid increase, which tends to be disadvantageous in terms of cost.

The thickness of the non-woven fabric is also not particularly limited, but may be, for example, in the range of 0.05 to 10 mm, preferably in the range of 0.10 to 8 mm, and more preferably in the range of 0.20 to 5 mm. May be good. If the thickness is too thin, it tends to be difficult to maintain the shape of the non-woven fabric, and if the thickness is too thick, the sheet-like fiber aggregate becomes too thick and the entanglement between the fibers is insufficient. Tends to be.

The non-woven fabric of one aspect contains the interlining-sheath type composite fibers in a predetermined range and has an adhesive portion in which the interlining-sheath-type composite fibers are bonded at the intersections where they intersect with each other. Excellent stability. For example, the non-woven fabric of the present invention may have an elongation rate of, for example, 40% or less, preferably 35% or less, and more preferably 31% or less. The elongation rate may be 0%, but in applications where the non-woven fabric is required to have extensibility, the elongation rate may be 5% or more, more preferably 10% or more. The elongation rate is a value measured by the method described in Examples described later.

Since the non-woven fabric of one embodiment contains cellulosic fibers and non-adhesive interlining sheath type composite fibers having EVOH in the sheath portion in a predetermined range, the non-woven fabric is released when compressed to a thickness of 30%. It is possible to control the liquid property. A mixture of distilled water and glycerin (distilled water / glycerin mass ratio = 5/4) is impregnated with 500% by mass based on the mass of the non-woven fabric, left for 24 hours, and then released at the time of 30% compression deformation for 10 seconds. The liquid release rate may be, for example, 7 to 14%, preferably 8 to 12%. If the liquid release rate is too low, the liquid release property is poor, and if the liquid release rate is too high, dripping may occur due to the liquid release. The liquid discharge rate is a value measured by the method described in Examples described later.

The non-woven fabric of one embodiment contains cellulosic fibers having a content in a predetermined range, and the non-adhesive interlining-sheath type composite fiber does not have an adhesive portion that substantially adheres to each other, so that moisture can be retained in the non-woven fabric. It is possible to secure sufficient space. Therefore, the water retention rate of the non-woven fabric may be, for example, 1145% or more, preferably 1180% or more, and more preferably 1200% or more. The upper limit of the water retention rate is not particularly limited, but may be, for example, about 1500%. The water retention rate is a value measured by the method described in Examples described later.

Since the non-woven fabric of one embodiment contains cellulosic fibers and non-adhesive interlining sheath type composite fibers having EVOH in the sheath portion in a predetermined range, for example, the compressive hardness is 0.750 to 1. It may be .500 N / mm, preferably 0.800 to 1.400 N / mm, and more preferably 0.850 to 1.300 N / mm. The compressive hardness is a value measured by the method described in Examples described later. If the compressive hardness is too small, it may cause excessive liquid release during use, for example, the liquid may be released before use by picking up the sheet from the package or folding it. .. On the other hand, if the compression hardness is too large, the liquid release rate tends to decrease.

The non-woven fabric of one aspect can form a pseudo-net state to suppress the generation of fluff, and the length of the fluff generated on the non-woven fabric may be, for example, 7.0 mm or less, preferably 6. It may be 5.5 mm or less, more preferably 3.0 mm or less. The fluff length is a value measured by the method described in Examples described later.
Further, even when the thickness of the non-woven fabric is thin, it is possible to suppress the length of the fluff generated, and the length of the fluff generated in the non-woven fabric is, for example, the thickness of one non-woven fabric. It may be 10 times or less, preferably 8 times or less, and more preferably 5 times or less.

Since it is preferable that the non-woven fabric of one embodiment does not slip between the non-woven fabrics when folded and used, the coefficient of static friction (A) between the non-woven fabrics may be, for example, 0.0550 to 0.0900, which is preferable. May be 0.0600 to 0.0900, more preferably 0.0650 to 0.0880. The coefficient of static friction (A) between the non-woven fabrics is a value measured by the method described in Examples described later, and the non-woven fabric is used in a state of containing 400% by mass of distilled water.

Since the non-woven fabric of one aspect preferably has smoothness when applied to the skin, the coefficient of static friction (C) between the non-woven fabric and the bioskin (artificial skin) is, for example, 0.0450 or less. It may be preferably 0.0430 or less. The coefficient of static friction (C) between the non-woven fabric and the bioskin (artificial skin) is a value measured by the method described in Examples described later, and the non-woven fabric contains 400% by mass of distilled water at the time of measurement. Used in.

The non-woven fabric of one aspect preferably has a smoothness with respect to the skin while the non-woven fabrics do not slip when folded and applied to the skin. Therefore, the coefficient of static friction (A) between the non-woven fabrics The difference (AC) between the non-woven fabric and the static friction coefficient (C) between the non-woven fabric and the bioskin (artificial skin) may be, for example, 0.0170 to 0.1000, preferably 0.0200 to 0. It may be 0900, more preferably 0.0300 to 0.0800.

[Liquid impregnation sheet]
The present invention includes a liquid impregnated sheet made of the non-woven fabric. The liquid impregnated sheet contains at least the non-woven fabric and the liquid described later, and can be suitably used in cleaning applications, beauty applications, medical applications, household applications, industrial applications, and the like.

The liquid used according to these uses can be appropriately selected according to the use, and may be a solution, dispersion, emulsion or the like having a known or commonly used active ingredient. The liquid may be an aqueous liquid such as water, an aqueous solution, or an aqueous emulsion, an organic solvent, an oil-based liquid using these as a medium, or a mixture thereof.

The amount of impregnation of the liquid to be used is not particularly limited as long as a predetermined effect can be obtained, and can be appropriately selected according to the purpose. The amount of the liquid impregnated may be, for example, 100 to 1000 parts by mass, preferably 150 to 800 parts by mass with respect to 100 parts by mass of the nonwoven fabric.

As the active ingredient, various beauty ingredients, cleaning ingredients, cleaning ingredients, disinfecting ingredients, medicinal ingredients, refreshing ingredients, insect repellent ingredients, coating agents, paints, finishing agents (for example, varnishes, etc.) are used depending on the application. These active ingredients may be used alone or in combination of two or more.

Further, as the active ingredient, a known or commonly used active ingredient can be used, and an appropriate solvent (water, ethanol, glycerin, propylene glycol, dipropylene glycol, butylene glycol, etc.) is used depending on the type and application of the active ingredient. , Auxiliary agents (emulsifiers, chelating agents, pH adjusters, neutralizers, thickeners, lubricants, crystallization rate retarders, etc.), additives (ultraviolet absorbers, powders, antioxidants, preservatives, fragrances, etc.) , Fluorescent whitening agent, antistatic agent, flame retardant, deodorant, plasticizer, colorant, etc.) can be used.

Beauty ingredients (ingredients for conditioning the body and appearance) include whitening ingredients, anti-aging (antioxidant, anti-wrinkle, anti-sagging) ingredients, anti-inflammatory (alleviating irritation, anti-allergic) ingredients, and cell activation (promoting turnover, DNA damage repair) component, moisturizing component, emollient component, astringent component, peeling component, blood circulation promoting component, antioxidant component, warming component, etc. Preferred beauty components are albutin, kodic acid, vitamin A, vitamin C, etc. , Vitamin E, astaxanthin, lucinol, acetylglucosamine, ellagic acid, tranexamic acid, linoleic acid, oxyproline, hydroxyproline, tocopherol and derivatives thereof, water-soluble polymers, amino acids, peptides such as EGF, sugar alcohols, sugars , Mucopolysaccharide, various plant extracts, placenta extract, capsaicin and the like.

Cleaning ingredients include nonionic surfactants, alcohols (ethanol, polyhydric alcohol, etc.), glycol ethers, oils (mineral oils, ester oils, waxes, silicone oils, etc.) for the purpose of cleaning the skin. Natural oil, etc.).

Examples of the cleaning component include amphoteric surfactants, cationic surfactants, anionic surfactants, solvents, alkaline agents, and the like, in addition to the above-mentioned cleaning components.

Disinfectants include chlorine-based disinfectants (chlorites such as sodium chlorite, hypochlorites such as sodium hypochlorite, chlorates such as sodium chlorite, and excesses such as sodium perchlorite. Chlorate and chlorinated cyanurate such as dichloroisopropylmethylphenol cyanurate), alcohols (ethanol, isopropanol, etc.), double-sided surfactants, quaternary ammonium salts (benzalconium chloride, benzethonium chloride, etc.) ), Chlorhexidine and the like.

As the medicinal ingredient, various medicinal ingredients can be used depending on the intended use. For example, as the medicinal ingredient used for poultices, anti-inflammatory agents, antihistamines, steroids, analgesic and anti-inflammatory agents, local anesthetics, etc. And so on.

Examples of the refreshing ingredient include alcohols such as ethanol, menthol, peppermint oil, peppermint oil, camphor (thymol), thymol, spirantol, and refreshing agents such as methyl salicylate.

Examples of insect repellent components include eucalyptus extract, menthol, peppermint oil, diethyl toluamide and the like.

For example, a cosmetological face mask contains a cosmetological ingredient and a solvent, and may contain other active ingredients, auxiliaries, additives and the like, if necessary.
The cleansing sheet contains a cleansing ingredient and may optionally contain other active ingredients (eg, cosmetological ingredients), solvents, auxiliaries, additives and the like.
The cleaning wiper contains a cleaning component, and may contain other active ingredients (coating agent, finishing agent, paint, etc.), solvent, auxiliary agent, additive, etc., if necessary.
The disinfectant / virus wiper contains a disinfectant component, and may contain other active ingredients (moisturizing component, etc.), a solvent, an auxiliary agent, an additive, and the like, if necessary.
The itch suppressing sheet contains a medicinal ingredient, and may contain other active ingredients (cooling ingredient, moisturizing ingredient, etc.), a solvent, an auxiliary agent, an additive, and the like, if necessary.
The antiperspirant sheet contains a refreshing component, and may contain other active ingredients (astringent component, moisturizing component, etc.), a solvent, an auxiliary agent, an additive, and the like, if necessary.
The insect repellent sheet contains an insect repellent component, and may contain other active ingredients (moisturizing component, etc.), a solvent, an auxiliary agent, an additive, and the like, if necessary.

In particular, the non-woven fabric of the present invention is sufficiently impregnated with the target liquid, has excellent liquid release property during use, and has excellent shape stability. Therefore, for example, it can be suitably used as a coating sheet (particularly a wiping sheet). It is possible. For example, when used as a coating sheet, it is possible to prevent the folded non-woven fabrics from slipping against each other, so that even if the size is larger than usual, it can be easily used in the folded state. For example, in such a case, the size of one sheet may be, for example, 200 cm ² or more, preferably 250 cm ² or more. The size of one sheet can be appropriately selected depending on the intended use. For example, in the case of skin care applications, the upper limit of the size of one sheet may be ^{, for example, about 1000 cm 2.}

Further, the liquid impregnated sheet of the present invention contains the above-mentioned active ingredients by utilizing water retention, liquid release rate and softness, and is useful as a skin care sheet to be used for the skin. The skin care sheet may be a sheet for so-called rubbing, which rubs the skin, or a sheet for so-called non-rubbing, which does not rub the skin.

The liquid impregnated sheet of the present invention is a sheet for non-rubbing use, and is a beauty sheet impregnated with a beauty ingredient (for example, a beauty mask, a nail care sheet, a scalp care sheet, and body care for the back, chest, abdomen, etc.). It can also be used as a sheet (sheet, hygiene sheet, etc.), a medicated or therapeutic sheet (itch control sheet, wipe, etc.).

On the other hand, by using a non-woven fabric having an appropriate compression hardness and liquid release rate (particularly a non-woven fabric capable of suppressing fluffing by friction) as a base material, the liquid-impregnated sheet of the present invention can be used as a sheet for rubbing. It can be preferably used. Sheets for rubbing include makeup removal sheets or cleansing sheets impregnated with wiping cleaning ingredients, body cleaning sheets (sweat wipes, antiperspirant sheets, hair, scalp wipes, wipes, hygiene sheets, etc.), insects. It can be used as a repellent sheet, a cooling sensation sheet, a medicated or therapeutic sheet (itch suppression sheet, etc.). In particular, when removing eye makeup, the amount of cosmetic components to be removed is large due to dark eye makeup, despite the extremely delicate skin area near the eyelids. It is particularly useful as a makeup removing sheet because it can sufficiently release liquid without causing a burden on the skin and can achieve both lipophilicity and hydrophilicity due to the ethylene-vinyl alcohol copolymer.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the present Examples. In the following Examples and Comparative Examples, various physical properties were measured by the following methods.

[Metsuke and apparent density]
^{The basis weight (g / m 2} ) was measured according to 6.2 of JIS L 1913 “General non-woven fabric test method”. The apparent density (g / cm ³ ) was calculated by dividing the basis weight by the thickness.

〔thickness〕
With reference to JIS L 1913, the thickness of a circular horizontal plate having a diameter of 25.4 mm ^{when a load of 12 g / cm 2} was applied was measured with a thickness measuring device, and used as the thickness of the non-woven fabric.

[Water retention]
It was measured according to JIS L 1913 6.9.2 (water retention rate). The test piece is cut into 10 cm squares and the mass X (g) is measured. The test piece was immersed in water for 15 minutes. Then, one side of the test piece was pinched and taken out of the water, and the mass Y (g) 1 minute later was measured. The water retention amount (g) was calculated from these values by the following formula.
Water retention (g) = YX

[Water retention rate]
The value obtained by dividing the mass of the test piece before immersion in water from the above water retention amount expressed as a percentage was calculated as the water retention rate (%) by the following formula.
Water retention rate (%) = (YX) / X × 100

[Compressive hardness]
The compressive hardness at the time of 30% compressive deformation was measured by the following procedure.
(1) Cut 8 pieces of the measurement sample into 5 cm squares and measure the mass of 8 pieces.
(2) Eight samples are superposed, and distilled water (manufactured by Fuji Film Wako Pharmaceutical Co., Ltd., product number 042-16973) and glycerin (glycerin P "Kenei" manufactured by Kenei Pharmaceutical Co., Ltd.) are mixed with distilled water 5 glycerin 4. The mixed solution adjusted in proportion (mass ratio) is dropped by 0.3 cc each from a position 2 cm above the sample, and 500% by mass of the whole is dropped and then impregnated on the entire surface of the sheet.
(3) Leave the mixture in a closed environment where the mixed solution does not evaporate, and leave it for 24 hours until the solution spreads over all eight sheets due to the capillary phenomenon.
(4) After 24 hours, the sample was taken out, and with reference to JIS L 1913, a load of ^{16 g / cm 2} was applied with a thickness measuring device of a circular horizontal plate having a diameter of 25.4 mm in a state where eight sheets were stacked. Measure the thickness E (mm).
(5) Subsequently, the sample was sampled using a YAWASA measuring instrument Type MESS-0512-1-SL manufactured by Tech Gihan Co., Ltd. under the conditions of an indenter diameter of 20.0 mm, a pushing speed of 1.0 mm / s, and a maximum load of 5.0 N. Measure the central part of the sheet with to find the repulsive stress.
(6) From the obtained data, the stress (N) applied when the strain F (mm) of the sheet thickness E (mm) × 30% is centered and the strain changes by 0.25 mm up and down is read. The value obtained by dividing the difference by 0.5 mm was defined as the compression hardness (N / mm) at the time of 30% compression deformation.

[Liquid discharge rate]
The liquid release rate at the time of 30% compression deformation was measured by the following procedure.
(1) Eight pieces of the measurement sample are cut into 5 cm squares, and the mass G (g) of the eight pieces is measured.
(2) Eight samples are superposed, and distilled water (manufactured by Fuji Film Wako Pharmaceutical Co., Ltd., product number 042-16973) and glycerin (glycerin P "Kenei" manufactured by Kenei Pharmaceutical Co., Ltd.) are mixed with distilled water 5 glycerin 4. 500% by mass of the mixed solution adjusted in proportion (mass ratio) is added dropwise from a position 2 cm above the sample by 0.3 cc to impregnate the entire surface of the sheet.
(3) Leave the mixture in a closed environment where the mixed solution does not evaporate, and leave it for 24 hours until the solution permeates all eight sheets due to the capillary phenomenon.
(4) After 24 hours, the sample was taken out, and with reference to JIS L 1913, a load of ^{16 g / cm 2} was applied with a thickness measuring device of a circular horizontal plate having a diameter of 25.4 mm in a state where eight sheets were stacked. Measure the thickness E (mm).
(5) Place the sample on the measuring table, place the cotton wool H (g) whose mass has been measured in advance at a position 2 cm away from the sample, and slowly slide the holding plate to the sample thickness E (mm) to make the sample. Insert cotton wool.
(6) As shown in FIG. 4, the measuring table is rotated 90 degrees to make the sample vertical. FIG. 4 is a schematic side view for explaining how the liquid released from the sample is absorbed by cotton wool in the liquid release rate test. The rotating measuring table 24 holds the sample 20 and the cotton wool 22 in a vertical line in the vertical direction. Since the sample 20 is arranged on the upper side of the cotton wool 22, when the sample 20 is compressed by the movement of the pressing plate 23, the mixed liquid released from the sample 20 is absorbed by the cotton wool 22.
(7) Specifically, the pressing plate 3 is moved at a speed of 0.2 mm / sec from the thickness E to a position where the sample is compressed by 30% in the thickness direction, and the sample 20 is compressed for a total of 10 seconds. The mixed liquid released from No. 20 is absorbed by the absorbent cotton 22.
(8) The mass I (g) of the absorbent cotton 22 that has absorbed the mixed solution is measured.
As a result, the liquid discharge rate J (%) from the sample was calculated by the following formula.
Liquid discharge rate J (%) = (IH) / (G × 5) × 100

[Static friction coefficient between liquid-impregnated non-woven fabrics]
The frictional force was measured with reference to ASTM-D1894 using a precision universal testing machine (“Autograph AGS-D type” manufactured by Shimadzu Corporation).

First, as shown in FIGS. 5 and 6, the sample 30 cut out in the MD direction 4.0 cm × CD direction 6.0 cm and the sample 30 cut out in the MD direction 6.0 cm × CD direction 12.0 cm were cut out from the obtained non-woven fabric. The friction member 35 was prepared. In the sample 30 of FIG. 5, in the CD direction, a width of 1 cm from the end was used as the grip portion 31a, and the remaining width of 5 cm was used as the ground contact portion 31b. In the friction member 35 of FIG. 6, in the CD direction, a width of 1 cm from the end was used as a grip portion 35c, and the remaining width of 11 cm was used as a ground contact portion 35d. Further, assuming a cleansing sheet, both the sample 30 and the friction member 35 were impregnated with distilled water (manufactured by Fuji Film Wako Pharmaceutical Co., Ltd., product number 042-16973) in an amount of 400% by mass.

Next, as shown in FIGS. 7 and 8, the sample 30 is placed on the friction member 35, the grip portion 31a of the sample 30 is gripped by the clip 36, and the weight 38 is determined from the weight 38 via the acrylic plate 37. A test was conducted in which the sample 30 was pulled in the direction of the arrow with the load of (1) applied.

Specifically, in a precision universal testing machine equipped with a load cell 32, the friction member 35 was placed on the table 39, and the sample 30 was placed on the friction member 35. The sample 30 and the friction member 35 are arranged with grip portions 31a and 35c in opposite directions, respectively, and these grip portions 31a and 35c are gripped by clips 36.

Next, an acrylic plate 37 of the same size was placed in a range (ground portion) of MD 4.0 cm × CD 5.0 cm of the sample 30, and a total ^{load of 3.75 g / cm 2} was applied to the acrylic plate 37 and the weight 38. In this state, the coefficient of static friction was calculated from the test force obtained by pulling the polyamide thread 34 horizontally through the pulley 33 and pulling the sample 30 horizontally in the CD direction at a speed of 100 mm / min.

[Static friction coefficient between liquid-impregnated non-woven fabric and bioskin]
The frictional force was measured with reference to ASTM-D1894 using a precision universal testing machine (“Autograph AGS-D type” manufactured by Shimadzu Corporation).

First, as shown in FIG. 9, a sample 30 cut out from the obtained non-woven fabric in an MD direction of 4.0 cm and a CD direction of 11.0 cm was prepared. In the sample 30 of FIG. 9, in the CD direction, a width of 1 cm from the end was used as the grip portion 31a, and the remaining 10 cm width was used as the ground contact portion 31b. Further, assuming a cleansing sheet, this sample was impregnated with distilled water (manufactured by Fuji Film Wako Pharmaceutical Co., Ltd., product number 042-16973) in an amount of 400% by mass.

Next, as shown in FIGS. 7 and 8, the sample 30 is placed on the friction member 35, the grip portion 31a of the sample 30 is gripped by the clip 36, and the weight 38 is determined from the weight 38 via the acrylic plate 37. A test was conducted in which the sample 30 was pulled in the direction of the arrow (CD direction) with a load applied.

In this test, (i) an artificial skin bioskin plate manufactured by Bulux Co., Ltd., part number P001-001 was used as the friction member 35, and (ii) the ground contact portion of the sample 30 was in the range of MD 4.0 cm × CD 10.0 cm. Similar to the coefficient of static friction between non-woven fabrics, except that (iii) the total load of the acrylic plate 37 and the weight 38 of the same size arranged on the ground contact portion is 5 g / cm ^2. A test was conducted and the coefficient of static friction was calculated.

[Fluff length]
The fluff length was measured with reference to ASTM-D1894 using a precision universal testing machine (“Autograph AGS-D type” manufactured by Shimadzu Corporation).

First, as shown in FIG. 10, a sample 30 cut out from the obtained non-woven fabric in a direction of 7.0 cm in the MD direction and 4.0 cm in the CD direction was prepared. In the sample 30 of FIG. 10, in the MD direction, a width of 1 cm from the end was used as the gripping portion 31a, and the remaining 6 cm width was used as the grounding portion 31b.

Next, as shown in FIGS. 7 and 8, the sample 30 is placed on the friction member 35, the grip portion 31a of the sample 30 is gripped by the clip 36, and the weight 38 is determined from the weight 38 via the acrylic plate 37. A test was conducted in which the sample 30 was pulled in the direction of the arrow with a load applied.

In this test, except for (i) using Sankyo Rikagaku Co., Ltd. water resistant file # 1000 as the friction member 35, and (ii) setting the ground contact portion of the sample 30 in the range of MD 6.0 cm × CD 4.0 cm. , The test was carried out in the same manner as the coefficient of static friction between the sheets, and the sample was pulled 10 cm in the MD direction at a speed of 100 min / min in the horizontal direction.

After that, the sample is removed from the testing machine, the sample 30 is fixed in a vertically suspended state with the grip portion 31a facing upward, and the longest of the visually identifiable fluff protruding from the MD direction end of the ground contact portion 31b of the sample. The lengths of five fluffs were measured in order, and the average value was taken as the fluff length (mm) of the sample. Further, the fluff length was divided by the thickness of the non-woven fabric to obtain the fluff length per the thickness (1 times) of the non-woven fabric. The thickness of the non-woven fabric is the thickness of the non-woven fabric when a load of ^{12 g / cm 2} is applied with a thickness measuring device of a circular horizontal plate having a diameter of 25.4 mm with reference to JIS L 1913.

〔Growth rate〕
JIS L 1913 (general short fiber non-woven fabric) 6.3.2 (tensile strength and elongation test when wet) using a precision universal testing machine (“Autograph AGS-D type” manufactured by Shimadzu Corporation) The elongation rate was measured according to.
As shown in FIG. 11, the gripping interval is 100 mm, the sample 40 is cut out in an MD direction of 2.5 cm and a CD direction of 12.0 cm, and a line is drawn with an oil-based felt-tip pen at a position 15 mm from one end in the CD direction. Another line was drawn with an interval of 90 mm. The sample 40 is placed in water at 20 ° C. ± 2 ° C. until it settles under its own weight, or is submerged in water for 1 hour or more to absorb the saturated water content. The

grip portions

41a and 41a provided at both ends of the sample 40 were gripped, and a tensile stress of 2N was instantly applied at a speed of 200 mm / min.

After that, the sample was removed from the testing machine, and the sample 40 was fixed in a vertically suspended state with one grip portion 41a facing upward, and the line-to-line spacing K (mm) was measured. The elongation rate L (%) was calculated by the following formula.
Elongation rate L (%) = K / 90 × 100-100

[Test on usability]
(sample)
Four sheets cut to a size of 7 cm square are stacked, and distilled water (Fuji Film Wako Pharmaceutical Co., Ltd. product number 042-16973) and glycerin (Kenei Pharmaceutical Co., Ltd. glycerin P "Kenei") are mixed with distilled water 5 A sample prepared by impregnating the entire sheet with a mixture prepared by adjusting the ratio of glycerin 4 (mass ratio) by 0.3 cc each by dropping 450% by mass from a position 2 cm above the sample.

(Test by panel)
Nine subjects (women in their twenties, thirties, and forties) applied lipstick "Shiseido Maquillage Dramatic Cluj N RD633" to their lips, and the CD direction of the sample was perpendicular to their fingers. One end was sandwiched between the index finger and the middle finger, and the other end was sandwiched between the ring finger and the little finger, and while lightly pressing the inside of the middle finger and the ring finger, the surface was wiped twice in the lateral direction.
Five items were evaluated for each sample: wiping property, skin irritation, morphological stability, fluffiness, and slip resistance between sheets.

[Wipeability]
A sensory test was carried out by the above method, and the sampling property was judged in the following three stages.
〇: The degree of lipstick removal is satisfactory △: The condition of lipstick removal is somewhat dissatisfied.
X: I am dissatisfied with the condition of the lipstick.

[Skin irritation]
A sensory test was carried out by the above method, and the irritation to the skin was judged in the following three stages.
〇: Less stimulus △: Slightly more stimulus ×: More stimulus

[Morphological stability]
The sensory test was carried out by the above method, and the judgment was made in the following three stages according to the following criteria.
After the test, unfold the sheet folded in four, measure in the CD direction, and calculate the width expanded from 15 cm before use.
〇: Spread width is within 5 mm Δ: Spread width exceeds 5 mm and is within 10 mm ×: Spread width exceeds 10 mm

[Fluffy]
The sensory test was carried out by the above method, and the judgment was made in the following three stages according to the following criteria.
After the test, the surface to be used was leveled, and the number of fibers protruding from the surface by 3 mm or more was counted.
〇: 0 pieces △: 1 piece or more and less than 5 pieces ×: 5 pieces or more

[Difficulty of slipping between sheets]
The sensory test was carried out by the above method, and the judgment was made in the following three stages according to the following criteria. The number of times the sheet slipped up during wiping and the outermost sheet in contact with the lips did not slip was counted.
〇: 0 times △: 1 time ×: 2 times or more

The above five items were evaluated, and the number of people evaluated for each item was taken as the sensory evaluation result.
A: 〇 is 7 or more B: 〇 is 4 or more and 6 or less C: 〇 is 3 or less

When a non-woven fabric already impregnated with a component such as a liquid is used, a method of measuring and evaluating the above physical properties after removing the impregnated component once according to the following procedure is preferable.
Specifically, the non-woven fabric impregnated with components such as liquid is immersed in the cleaning liquid for 2 hours, and the non-woven fabric is washed in order to remove the components pre-impregnated in the obtained non-woven fabric from the non-woven fabric. The amount of the cleaning liquid is 2 L per ^{100 cm 2 of the non-woven fabric area.} Further, the impregnating component is not particularly limited as long as it can be removed, but for example, ion-exchanged water / neutral detergent = 95/5 (volume ratio) may be used as the cleaning liquid. As the neutral detergent, for example, Kao Corporation cucute (trademark) is used, and the non-woven fabric is allowed to stand in a liquid. Then, after immersing in the same amount of ion-exchanged water for 2 hours to drop the cleaning liquid, the non-woven fabric is air-dried (conditions: 10 ° C., 65% RH, 24 hours) so as not to change the shape of the non-woven fabric as much as possible. It can be used as a sample.

(Example 1)
80 parts by mass of cellulose-based fiber (recycled cellulose fiber, "Hope" manufactured by Omikenshi Co., Ltd., fineness 1.7 dtex, fiber length 40 mm), non-adhesive core sheath type composite fiber (core part is composed of polyethylene terephthalate, sheath part Is a core-sheath type composite fiber composed of an ethylene-vinyl alcohol copolymer (EVOH), "Sofista" manufactured by Kuraray Co., Ltd., fineness 1.7 dtex, fiber length 51 mm, core-sheath mass ratio (core 50% sheath 50%) ), 10 parts by mass, adhesive core-sheath type composite fiber (core-sheath type composite fiber whose core is made of polypropylene and whose sheath is made of polyethylene, manufactured by Ube Eximo Co., Ltd., fineness 1.7 dtex, fiber length After uniformly mixing 51 mm and core-sheath mass ratio (core 39% sheath 61%) at a ratio of 10 parts by mass, ^{a semi-random card web with a grain size of 50 g / m 2} was prepared by a conventional method, and this card web was prepared. Is placed on a punching drum support having an opening ratio of 25% and a hole diameter of 0.3 mm and continuously transferred in the longitudinal direction at a speed of 50 m / min. An entangled fiber web (nonwoven fabric) was manufactured. In this entanglement treatment, two nozzles having an orifice with a hole diameter of 0.10 mm provided at an interval of 0.6 mm along the width direction of the web were used (adjacent nozzles). The water pressure of the high-pressure water stream ejected from the nozzles in the first row was 3.0 MPa, and the water pressure of the high-pressure water stream jetted from the nozzles in the second row was 4.0 MPa. The fibers were placed on a flat support and continuously transferred, and high-pressure water flow was sprayed to perform entanglement processing. In this entanglement processing, orifices having a hole diameter of 0.10 mm were spaced by 0.6 mm along the width direction of the web. Both were carried out under the condition of a high-pressure water flow with a water pressure of 4.0 MPa using the two nozzles provided in 1. Further drying at 130 ° C. to obtain a spunlace fiber fiber having a ^{grain size of 50.2 g / m 2.} rice field.

(Examples 2 and 3)
A spunlace non-woven fabric was obtained in the same manner as in Example 1 except that a semi-random card web having a fiber composition ratio changed to that shown in Table 1 was produced.

(Comparative Examples 1 to 4)
A spunlace non-woven fabric was obtained in the same manner as in Example 1 except that a semi-random card web having a fiber composition ratio changed to that shown in Table 1 was produced.

(Comparative Examples 5 and 6)
Example 1 except for producing a semi-random card web using polyester fiber (“Tetron” T-471 manufactured by Toray Industries, Inc., fineness 1.6 dtex, fiber length 51 mm) instead of the non-woven interlining sheath type composite fiber. A spunlace non-woven fabric was obtained in the same manner as above.

(Comparative Example 7)
A spunlace non-woven fabric was obtained in the same manner as in Example 1 except that the drying temperature was lowered to 110 ° C.

(Comparative Example 8)
A spunlace non-woven fabric was obtained in the same manner as in Example 1 except that the drying temperature was raised to 160 ° C.

As shown in Table 1, in Comparative Example 1, although the elongation rate can be controlled by forming the adhesive interlining sheath type composite fiber, the water retention amount is low because the proportion of the cellulosic fiber is low. Regarding the compressive hardness when impregnated with liquid, it is too soft when compressed and does not have an appropriate hardness (elasticity). In the sensory evaluation, the sheets slipped on each other during wiping, and as a result, sufficient wiping property could not be exhibited.

In Comparative Example 2, the elongation rate can be controlled by forming the adhesive interlining sheath type composite fiber, but the adhesive portion is formed with a high proportion of cellulosic fibers, so that the structure becomes too dense. , Both the water retention rate and the liquid discharge rate become low. Further, since it does not contain the non-adhesive interlining sheath type composite fiber having EVOH in the sheath portion, the compression hardness at the time of liquid impregnation cannot be controlled, and the compression hardness becomes too hard at the time of compression. Also, the friction between the bioskin and the liquid impregnated non-woven fabric is high. In the sensory evaluation, the irritation to the skin became stronger, and the wiping property also deteriorated due to the low liquid release rate.

In Comparative Example 3, since the interlining sheath type composite fiber is not contained, the elongation rate cannot be controlled. Therefore, even in the sensory test, the morphological stability is evaluated low. However, in Comparative Example 3, the decrease in the elongation rate is slightly alleviated by densification of the non-woven fabric by the cellulosic fiber, and the deterioration in the liquid release rate and the decrease in the water retention rate are alleviated as compared with Comparative Example 2. Still, the obtained non-woven fabric has a low water retention rate and a low liquid release rate. In the sensory evaluation, since it does not have an adhesive portion, the morphological stability is poor, the irritation to the skin becomes strong due to the decrease in the liquid release property, and the wiping property also deteriorates.

In Comparative Example 4, since the interlining sheath type composite fiber is not contained, the elongation rate is high and the morphological stability cannot be controlled at all. Further, the compression hardness at the time of liquid impregnation is too soft at the time of compression and does not have an appropriate hardness (elasticity). In the sensory evaluation, it is evaluated that the morphological stability is particularly poor because it does not have an adhesive portion.

In Comparative Examples 5 and 6, mere PET fibers are used instead of the non-adhesive interlining sheath type composite fibers having EVOH in the sheath portion. Therefore, in Comparative Example 5, the compressive hardness (elasticity) is low, and as a result, the liquid release property is deteriorated even though the water retention rate is high. Further, in Comparative Example 6, since the proportion of PET fibers is high and the proportion of cellulosic fibers is low as compared with Comparative Example 5, the non-woven fabric cannot be densified, the compressive hardness is extremely low, and the liquid release rate is also high. It is too expensive and even fluffy.

In the sensory evaluation, in Comparative Example 5, it was evaluated that the amount of liquid discharged was small and there was a problem in wiping performance. As a result, sufficient wiping property cannot be exhibited. Furthermore, the fluffiness is also evaluated as low.

In Comparative Example 7, although the interlining-sheath type composite fiber is contained, since it does not have an adhesive portion, the elongation rate becomes high and the morphological stability cannot be controlled at all. Further, a large amount of fluff is generated, and the compression hardness at the time of liquid impregnation is too soft at the time of compression and does not have an appropriate hardness (elasticity). In the sensory evaluation, since it does not have an adhesive portion, it is evaluated not only to have particularly poor morphological stability but also to have low fluffiness.

In Comparative Example 8, not only the interlining-sheath type composite fiber but also the non-adhesive interlining-sheath type composite fiber has an adhesive portion, so that both the water retention rate and the liquid discharge rate are increased because there are too many adhesive portions. It will be low. Further, the compression hardness at the time of liquid impregnation cannot be controlled, and the compression hardness becomes too hard at the time of compression. Also, the friction between the bioskin and the liquid impregnated non-woven fabric is high. In the sensory evaluation, the irritation to the skin became stronger, and the wiping property also deteriorated due to the low liquid release rate.

On the other hand, in Examples 1 to 3, since the adhesive portion is formed in a controlled state, the elongation rate of the non-woven fabric can be controlled to improve the morphological stability. Further, the water retention rate and the liquid release rate can be set in a suitable range while maintaining morphological stability. In addition, the sheets can maintain a predetermined frictional force to suppress slippage between the sheets, while the friction with respect to the bioskin can be reduced, so that it is good even when folded and wiped off, for example. Achieves excellent wiping performance. Also, in the sensory test, the morphological stability, skin irritation, wiping property, slipperiness between sheets and fluffiness have been positively evaluated.

Since the non-woven fabric of the present invention is excellent in morphological stability, water retention, and liquid release property, it can be suitably used as a liquid impregnated sheet for face masks, coating sheets, wipe sheets, and the like. In particular, when the non-woven fabrics are folded and used, the non-woven fabrics do not slip easily and are easy to handle, and the friction between the non-woven fabrics and the skin can be reduced. Therefore, even if the non-woven fabrics are folded and used, they can be used comfortably.

As described above, a preferred embodiment of the present invention has been described, but various additions, changes or deletions can be made without departing from the spirit of the present invention, and such additions, changes or deletions are also included in the scope of the present invention. Is done.

10 Non-woven fabric 11 Adhesive interlining sheath type composite fiber 11a Interlining sheath type composite fiber sheath part 11b Adhesive interlining sheath type composite fiber core part 12 Adhesive part 13 Cellular fiber 14 Non-adhesive interlining sheath

type composite fiber

20,30,40 sample 22 Degreased cotton 23 Pressing plate 24 Measuring table 35

Fried member

31a, 41a Sample gripping part 31b Sample grounding part 32 Load cell 33 Pulley 34 Polyamide thread 35c Fried member gripping part 35d Fried member grounding part 36 Clip 37 Acrylic plate 38 weight 39 table

Claims

A non-woven fabric containing cellulosic fibers, interlining-sheath type composite fibers and non-adhesive interlining-sheath type composite fibers.
With respect to the total mass of the non-woven fabric
The content of the interlining sheath type composite fiber is 5% by mass or more and 20% by mass or less.
The content of the cellulosic fiber is 45% by mass or more and less than 90% by mass, and the interlining-sheath type composite fiber has an adhesive portion bonded at an intersection where it intersects with each other.
The non-adhesive interlining sheath type composite fiber is a non-woven fabric in which the sheath portion contains an ethylene-vinyl alcohol copolymer.
The non-woven fabric according to claim 1, wherein the mass ratio of the content (T) of the cellulosic fiber and the content (N) of the non-adhesive interlining sheath type composite fiber is T / N = 99/1 to 51. Non-woven fabric that is / 49.
The non-woven fabric according to claim 1 or 2, wherein the elongation rate when absorbing saturated water content is 40% or less.
The non-woven fabric according to any one of claims 1 to 3, impregnated with a mixed solution of distilled water and glycerin (distilled water / glycerin mass ratio = 5/4) in an amount of 500% by mass based on the mass of the non-woven fabric. A non-woven material having a compressive hardness of 0.750 to 1.500 N / mm at the time of 30% compressive deformation when left for 24 hours.
The non-woven fabric according to any one of claims 1 to 4, which is impregnated with a mixed solution of distilled water and glycerin (distilled water / glycerin mass ratio = 5/4) in an amount of 500% by mass based on the mass of the non-woven fabric. A non-woven fabric having a liquid discharge rate of 7 to 14% for 10 seconds, which is released at the time of 30% compression deformation when left for 24 hours.
The non-woven fabric according to any one of claims 1 to 5, which has a water retention rate of 1145% or more.
The non-woven fabric according to any one of claims 1 to 6, wherein the non-woven fabric contains 400% by mass of distilled water and has a coefficient of static friction (A), and the non-woven fabric and bio-woven fabric contain 400% by mass of distilled water. A non-woven fabric having a difference (AC) from the coefficient of static friction (C) with the skin (artificial skin) of 0.0170 to 0.1000.
The non-woven fabric according to any one of claims 1 to 7, wherein the non-woven fabric having a coefficient of static friction (A) of 0.0550 to 0.0900 in a state containing 400% by mass of distilled water.
The non-woven fabric according to any one of claims 1 to 8, wherein the non-woven fabric containing 400% by mass of distilled water and the bioskin (artificial skin) have a coefficient of static friction (C) of 0.0450 or less. , Non-woven fabric.
The non-woven fabric according to any one of claims 1 to 9, wherein the fluff length per thickness (1 times) of the non-woven fabric is 10 times or less.
A liquid impregnated sheet using the non-woven fabric according to any one of claims 1 to 10.
A wipe sheet using the non-woven fabric according to any one of claims 1 to 10.
The method for producing a nonwoven fabric according to any one of claims 1 to 10.
It contains cellulosic fibers, adhesive core-sheath type composite fibers and non-adhesive core-sheath type composite fibers, and the content of the adhesive core-sheath type composite fibers is 5% by mass or more and 20% by mass or less with respect to the total mass of the web. There is a step of performing an entanglement treatment on a web having a cellulosic fiber content of 45% by mass or more and less than 90% by mass to form a web having an entangled structure.
In a web having the entangled structure, a non-woven fabric comprising at least a step of not forming an adhesive portion between the non-adhesive interlining sheath type composite fibers and forming an adhesive portion between the interlining sheath type composite fibers. Production method.
The method for producing a non-woven fabric according to claim 13, wherein the entanglement treatment is water-flow entanglement.
The non-woven fabric according to claim 13 or 14, which is lower than the melting point of the sheath portion of the non-interlining sheath type composite fiber and from the melting point of the sheath portion of the interlining sheath type composite fiber in the step of forming the adhesive portion. A method for manufacturing non-woven fabrics, in which heat treatment is performed at a high temperature.