JP2022037051A - Laminated nonwoven fabric and production method therefor, liquid impregnation sheet, liquid impregnated sheet, and face mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated nonwoven fabric that can suitably be used as a liquid impregnation sheet excellent in handleability when impregnated with liquid.

SOLUTION: Provided is a laminated nonwoven fabric in which a surface layer having short fibers of a fiber length of 200 mm or less is arranged on both surface sides of a spunbond nonwoven fabric having V1/V2 of 1.5 or more when V1 is the volume of one bonded portion formed by bonding the fibers to each other and V2 is the volume of the fiber contained in the bonded portion, and the spunbond nonwoven fabric and the surface layer are integrated by entanglement of the fibers.

SELECTED DRAWING: None

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present disclosure relates to a laminated nonwoven fabric and a method for producing the same, a liquid impregnating sheet for use by impregnating a liquid, particularly a cosmetic, and a liquid impregnating sheet and a face mask impregnated with the liquid.

Various liquid-impregnated sheets used for removing a predetermined substance from the skin of the human body or applying the predetermined substance to the skin of the human body have been proposed and put into practical use. In particular, in the field of beauty and cosmetics, a liquid-impregnated skin covering sheet impregnated with a liquid containing an active ingredient (for example, cosmetics) (used for face masks used by attaching to the face, heels, elbows, knees, etc.) Demand for keratin care sheets) is expanding. As the base material of the liquid-impregnated skin covering sheet, a non-woven fabric mainly composed of hydrophilic fibers such as rayon is generally used.

As a sheet impregnated with a cosmetic, a sheet having a structure in which hydrophilic fibers and hydrophobic fibers are combined has been proposed. For example, in Patent Document 1, a fiber having a structure of at least three layers composed of an inner layer composed of fiber aggregates mainly composed of hydrophobic fibers and upper and lower outer layers composed of fiber aggregates mainly composed of hydrophilic fibers. A cosmetic impregnated sheet in which a structure is impregnated with cosmetics has been proposed. In Patent Document 2, a surface layer containing a predetermined amount of heat-adhesive synthetic fiber and having a texture within a predetermined range and a surface layer containing a predetermined amount or more of water-absorbent fiber are laminated on both surfaces of the inner layer, and the inner layer and the surface layer. There has been proposed a base material for impregnating cosmetics having a structure in which water is entangled with water and is heat-bonded by heat-adhesive synthetic fibers.

Japanese Patent Application Laid-Open No. 2003-93152 Japanese Patent No. 4549056

It is an object of the present disclosure to provide a laminated nonwoven fabric which can be suitably used as a liquid impregnating sheet having excellent handleability when impregnated with a liquid.

The present disclosure is a laminated nonwoven fabric containing a surface layer containing short fibers having a fiber length of 200 mm or less, which is arranged on the surface side of both the spunbonded nonwoven fabric and the spunbonded nonwoven fabric, respectively.
The spunbonded non-woven fabric and the surface layer are integrated by entanglement of fibers.
In the spunbonded nonwoven fabric, V1 / V2 is 1.5 or more when the volume of one adhesive portion formed by adhering fibers to each other is V1 and the volume of the fibers contained in the adhesive portion is V2.
Provided is a laminated non-woven fabric.

The present disclosure also relates to a spunbonded nonwoven fabric having V1 / V2 of 1.5 or more, where V1 is the volume of one bonded portion in which fibers are bonded to each other and V2 is the volume of fibers contained in the bonded portion. A fiber web containing short fibers having a fiber length of 200 mm or less is arranged on both sides to prepare a laminated fiber web, and the laminated web is entangled to form a spunbonded nonwoven fabric and the short fiber web with each other. Provided is a method for manufacturing a laminated nonwoven fabric, which comprises integrating by entanglement.

According to the present embodiment, it is possible to obtain a laminated non-woven fabric which is relatively bulky, has a good touch and texture, and is excellent in handleability in a state impregnated with a liquid. Therefore, when this is used for a liquid impregnated sheet such as an antiperspirant sheet or a face mask, a liquid impregnated sheet that is relatively difficult to stretch and easy to handle can be obtained during the taking-out operation and the unfolding operation. ..

(Background to this embodiment)
Since the sheet impregnated with liquid is applied to the skin of the human body, its tactile sensation is naturally emphasized, but since a relatively large force may be applied when using it, a machine such as strength etc. There are also certain requirements for physical characteristics. Specifically, the liquid-impregnated sheet is provided in a pop-up state, for example, like tissue paper, or is rolled into a roll and stored in a cylindrical container, and is stored in a cylindrical container at an outlet. It may be offered as a product that can be torn off one by one. When using such a product, a relatively strong force is likely to be applied when the sheet is taken out, so that the taken-out sheet may be stretched and difficult to use.

Further, the face mask is generally provided by storing a plurality of sheets impregnated with a liquid in a container in a state of being folded and folded one by one or a plurality of sheets at a time. Therefore, when using it, it is necessary to unfold the folded face mask. If the face mask is stretched during this work, the positions of the openings and cuts provided corresponding to the eyes, mouth, nose, etc. will shift, making it difficult to attach the face mask to the face as prescribed. May become.

The liquid impregnated sheet is often composed of hydrophilic fibers such as rayon or water-absorbent fibers as main fibers so that the liquid can be sufficiently impregnated. However, if it is attempted to obtain a non-woven fabric having a relatively high strength by using only those fibers, in the non-woven fabric in which the fibers are entangled with each other by a high-pressure fluid flow, it is necessary to strongly entangle the fibers with each other, whereby the non-woven fabric needs to be strongly entangled. The tactile sensation becomes hard.

Therefore, as in Patent Documents 1 and 2, a configuration has been proposed in which an inner layer containing synthetic fibers is provided as a fiber layer for ensuring a certain degree of mechanical strength, and water-absorbent fibers are arranged as a surface layer. According to such a laminated structure, the mechanical strength of the entire nonwoven fabric can be increased to some extent. In particular, when the inner layer is a spunbonded non-woven fabric, the spunbonded non-woven fabric itself has high strength and does not easily stretch. Therefore, even if the inner layer has a relatively small basis weight, the strength of the entire non-woven fabric is significantly improved. Was thought to get.

However, although the spunbonded nonwoven fabric itself has high strength, the fibers do not sufficiently entangle with each other even when integrated with other fiber layers, for example, by performing a high-pressure fluid flow entanglement treatment, and delamination occurs in the laminated nonwoven fabric. It is easy to occur. Then, in order to prevent delamination, it was necessary to increase the pressure of the fluid flow. As a result, the texture and softness of the obtained laminated nonwoven fabric were also impaired, and it was not possible to obtain a material suitable for use as a liquid impregnated sheet.

Therefore, as a result of further studies by the present inventors, when a spunbonded nonwoven fabric having a smaller degree of adhesion between fibers at the adhesive portion is used, the fibers are satisfactorily bonded to each other in a configuration in which the fiber layer is arranged on the surface thereof. It was found that delamination is unlikely to occur due to entanglement. That is, when fiber layers containing short fibers are arranged above and below such a spunbonded nonwoven fabric and a high-pressure fluid flow is allowed to act, even if the pressure of the high-pressure fluid flow is relatively low, the spunbonded nonwoven fabric and the short fibers It has been found that a non-woven fabric in which the fiber layers are entangled to the extent that delamination is unlikely to occur and the overall texture is relatively good can be obtained.
Hereinafter, the laminated nonwoven fabric of the present embodiment will be described.

(Spanbond non-woven fabric)
The laminated nonwoven fabric of the present embodiment is a laminated nonwoven fabric containing a surface layer containing short fibers, which is arranged on the side of the surface of both the spunbonded nonwoven fabric and the spunbonded nonwoven fabric, respectively, and the spunbonded nonwoven fabric and the surface layer. However, in the spunbonded non-woven fabric, the volume of one bonded portion in which the fibers are bonded is V1 and the volume of the fibers contained in the bonded portion is V2. It is a laminated non-woven fabric having / V2 of 1.5 or more. Here, first, the spunbonded nonwoven fabric will be described.

The spunbonded non-woven fabric is a non-woven fabric composed of long fibers made of synthetic resin, in which the fibers are integrated by an adhesive portion. The bonded portion is a portion where the fibers are densely bonded to each other by the material (resin) constituting the fibers. In the present embodiment, a spunbonded nonwoven fabric having a relatively small basis weight and relatively weak adhesion by the adhesive portion, and therefore the degree of fiber density in the adhesive portion is relatively small, is preferably used.

In order to show the degree of density of fibers in the bonded portion, in this embodiment, V1 / V2, which is the ratio of the volume V1 of one bonded portion to the volume V2 of the fibers contained in the bonded portion, is used. The volume V1 of the bonded portion is obtained by determining the area and thickness of the bonded portion from the electron micrograph and multiplying them. The volume of the fiber contained in the bonded portion (volume occupied by the fiber) is calculated from the basis weight, fineness and fiber diameter of the non-woven fabric. More specifically, from the fineness of the fiber (dtex: weight per 10,000 m (g)) and the texture (weight of the non-woven fabric per 1 m ² (g)), one fiber is contained in the adhesive portion. The total length (mm) of the fiber contained in the adhesive portion of the volume V1 is calculated assuming that the fiber is the same. By multiplying the obtained total length of the fiber by the cross-sectional area obtained from the fiber diameter, the volume V2 of the fiber contained in the adhesive portion of the volume V1 can be obtained.

If V1 / V2 = 1, there are no voids in the bonded portion, and the fibers fill the bonded portion without gaps. The larger V1 / V2, the more voids are formed between the fibers. It can be said that the larger the number of voids, the weaker the adhesion at the bonded portion.
When determining V1 / V2, select four adhesive portions located near each vertex of the region in a region of 20 cm in length × 20 cm in width, and obtain V1 and V2 for these to calculate V1 / V2. Then, the calculated average value of V1 / V2 is obtained.

In the spunbonded nonwoven fabric, the larger V1 / V2, the smaller the degree of adhesion between the fibers in the bonded portion, so that the fibers in the non-bonded portion located between the bonded portions are more easily moved. Therefore, it is considered that it is easy to be entangled with the fibers of the surface layer. As a result, in the present embodiment, even if the pressure of the high-pressure fluid flow is made relatively small and the degree of entanglement between the fibers is lowered, it is considered that the fibers are appropriately entangled with each other and delamination is less likely to occur. Although the strength of the spunbonded nonwoven fabric (for example, breaking strength) decreases as V1 / V2 increases, the effect of improving the strength of the spunbonded nonwoven fabric cannot be appropriately obtained unless the surface layer and the spunbonded nonwoven fabric are integrated. In consideration of this, in the present embodiment, the value of V1 / V2 is set to 1.5 or more, and the prevention of delamination is prioritized.

V1 / V2 is preferably 1.8 or more, more preferably 2.1 or more, particularly preferably 2.5 or more, and most preferably 3.0 or more. When the value of V1 / V2 is less than 1.5, the degree of density of the fibers in the bonded portion is large, and delamination is likely to occur. The upper limit of the value of V1 / V2 is, for example, 10.0, particularly 7.0, and more particularly 5.0. If the value of V1 / V2 is too large, the fibers may not be sufficiently bonded to each other at the bonded portion, and the reinforcing effect of the spunbonded nonwoven fabric may not be obtained.

Further, in the spunbonded nonwoven fabric used in the present embodiment, t1 / t2 is 0.070 or more when the thickness of the bonded portion where the fibers are bonded is t1 and the thickness other than the bonded portion is t2. It is preferably a spunbonded non-woven fabric. The strength of the adhesion by the adhesive portion also appears in the thickness of the adhesive portion, and the smaller the thickness of the adhesive portion, the stronger the adhesion tends to be.

More specifically, the spunbonded nonwoven fabric used in the present embodiment has t1 / when the thickness of the bonded portion where the fibers are bonded is t1 and the thickness of the portion other than the bonded portion is t2. A spunbonded non-woven fabric having t2 of 0.070 or more is preferable. The t1 / t2 of the spunbonded non-woven fabric is more preferably 0.075 or more, and most preferably 0.080 or more. The upper limit of t1 / t2 is less than 1, especially 0.095, more particularly 0.090, and even more particularly 0.085. When t1 / t2 is 1, there is substantially no difference between the bonded portion and the non-bonded portion, and therefore, when t1 / t2 is 1 or more, the reinforcing effect of the spunbonded non-woven fabric may not be obtained. be.

The long fibers constituting the spunbonded non-woven fabric include, for example, a polyester resin such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate, and a copolymer thereof, polypropylene, polyethylene. Polyethylenes such as (including high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, ethylene-propylene copolymer, ethylene-vinyl alcohol copolymer, and ethylene-vinyl acetate copolymer. It is made of a resin arbitrarily selected from a polyethylene resin, a polyamide resin such as nylon 6, nylon 12, and nylon 66.

The long fibers of the spunbonded non-woven fabric are particularly preferably made of a polyester resin such as polyethylene terephthalate. Since the spunbonded nonwoven fabric made of polyester resin fibers has a slightly higher hydrophilicity than that made of olefin resin fibers, it may be easier to impregnate the sheet with a liquid.

The long fiber may be a single fiber made of one resin or a mixture of a plurality of resins, or may be a composite fiber made of a plurality of components. The long fiber, which is a composite fiber, may be, for example, a core-sheath type composite fiber composed of a core component and a sheath component. Further, the spunbonded nonwoven fabric may be composed of two or more types of long fibers.

The fineness of the long fibers constituting the spunbonded nonwoven fabric may be, for example, 0.5 dtex to 7.0 dtex, particularly 1.0 dtex to 4.0 dtex, and more particularly 1.2 dtex to 2.5 dtex. It may be there.

The basis weight of the spunbonded non-woven fabric may be, for example, 5 g / m ² to 30 g / m ² , particularly 6 g / m ² to 20 g / m ² , and more particularly 7 g / m ² to 15 g / m ² . May be. A spunbonded nonwoven fabric having a basis weight within this range is likely to be moderately entangled with the surface layer, and is likely to give a laminated nonwoven fabric in which delamination is unlikely to occur.

The spunbonded nonwoven fabric may have, for example, a thickness of 0.05 mm to 0.20 mm, particularly 0.08 mm to 0.17 mm, more particularly 0.10 mm to 0.15 mm. ..

The spunbonded non-woven fabric has a breaking elongation of 1% to 30%, particularly 2% to 20%, more particularly 3% to 15%, and even more particularly 4 to 10% in the MD direction. It may have a breaking elongation of 2% to 50%, particularly 3% to 30%, more particularly 4% to 20% in the CD direction.

In the present embodiment, a spunbonded nonwoven fabric having a 10% elongation stress of 30 N / 5 cm or less in the MD direction is preferably used. The stress at 10% elongation in the MD direction is more preferably 20 N / 5 cm or less, and even more preferably 15 N / 5 cm or less. The lower limit of the 10% elongation stress in the MD direction is, for example, 1.0 N / 5 cm, particularly 3.0 N / 5 cm, and more particularly 5.0 N / 5 cm. The spunbonded nonwoven fabric having a 10% elongation stress of 30 N / 5 cm or less in the MD direction may have V1 / V2 of less than 1.5, and even in that case, the degree of adhesion of the spunbonded nonwoven fabric to the surface layer is high. It is a weak one suitable for integration. Further, in the present embodiment, a spunbonded nonwoven fabric having a stress at 10% elongation of 7.0 N / 5 cm or less in the CD direction is preferably used. The stress at 10% elongation in the CD direction is more preferably 4.0 N / 5 cm or less, and even more preferably 2.7 N / 5 cm or less. The lower limit of the 10% elongation stress in the CD direction is, for example, 0.5 N / 5 cm, particularly 1.0 N / 5 cm, and more particularly 1.5 N / 5 cm.

The spunbonded nonwoven fabric used in the present embodiment preferably does not have elasticity in any direction. The term "stretchability" as used herein means that the elastic modulus at 20% elongation measured according to JIS L 1096: 2010 8.15.1 is 50% or more. If the elongation at break is less than 20%, it shall not have elasticity in that direction. If the spunbonded non-woven fabric has elasticity, it may be difficult to process the laminated non-woven fabric as a liquid impregnating sheet into a face mask (for example, when punching according to the shape of the face). be.

(Surface layer)
Next, surface layers arranged on both surfaces of the spunbonded nonwoven fabric will be described.
The surface layer contains short fibers having a fiber length of 200 mm or less and is not a spunbonded nonwoven fabric. The surface layer preferably contains 50% by mass or more of staple fibers. When the proportion of the short fibers is 50% by mass or more, the texture of the non-woven fabric is softened and the tactile sensation is likely to be good. The surface layer preferably contains 70% by mass or more of short fibers, more preferably 80% by mass or more, still more preferably 90% by mass or more, and most preferably only short fibers.

Staples have a fiber length of 200 mm or less. The fiber length of the short fibers may be, for example, 10 mm or more and 100 mm or less, particularly 25 mm or more and 100 mm or less, more particularly 30 mm or more and 70 mm or less, and even more particularly 35 mm or more and 65 mm or less, depending on the method of preparing the surface layer and the like. It is selected as appropriate. The surface layer may contain staples having different fiber lengths.

The fibers constituting the surface layer are not particularly limited, and are, for example, natural fibers (excluding cotton) such as pulp, linen, silk, and wool, viscose rayon, cupra, and solvent-spun cellulose fibers (for example, lenting lyocell (registered)). It is arbitrarily selected from recycled fibers such as (trademark) and Tencel (registered trademark), as well as synthetic fibers and the like.

The resins constituting the synthetic fiber are polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate and polyester resins such as copolymers thereof, polypropylene, polyethylene (high density polyethylene, Polyethylene-based resins such as low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer, such as nylon 6, nylon 12, and nylon 66. It is arbitrarily selected from engineering plastics such as polyamide resins, acrylic resins, polycarbonates, polyacetals, polystyrenes and cyclic polyolefins, as well as elastomers thereof.

The synthetic fiber contained in the surface layer may be a single fiber (a fiber having a section having a fiber cross section of one section) or a composite fiber (a fiber having a fiber cross section consisting of two or more sections). When it is a composite fiber, the composite morphology may be any of a core-sheath type (including concentric and eccentric), a split type, a side-by-side type and a sea-island type. Further, the synthetic fiber may be a single fiber or a composite fiber, and the shape of the fiber cross section (outer peripheral shape) may not be circular, for example, an elliptical shape, a Y shape, a well shape, a polygonal shape, and the like. Alternatively, it may have a cross section (odd cross section) other than a circle such as a star shape. Fibers having a recess on the outer periphery of the cross section, such as a Y-shape, a well-shape, a polygon, or a star, can easily hold a liquid in the recess and may improve the liquid retention property of the surface layer.

The surface layer preferably contains hydrophilic or water-absorbent fibers so that it can hold a sufficient amount of liquid, for example cellulose fibers, viscose rayon, cupra, and solvent-spun cellulose fibers (eg, lenting lyocell (eg, lenting lyocell). It is particularly preferable to contain recycled fibers such as (registered trademark) and Tencel (registered trademark)). The surface layer may contain, for example, 20% by mass or more of cellulose fibers, particularly 50% by mass or more, more particularly 70% by mass or more, and even more particularly 90% by mass or more, or may consist only of cellulose fibers.

The fineness of the cellulose fiber contained in the surface layer may be, for example, about 0.1 dtex to 6 dtex, and particularly may be about 0.3 dtex to 3.5 dtex. Cellulose fibers with a fineness within this range are suitable for ensuring the flexibility of the entire laminated nonwoven fabric. If the fineness of the cellulose fiber is too small, the card-passability in manufacturing the fiber web may be deteriorated, and the productivity of the non-woven fabric may be lowered. If the fineness of the cellulose fibers is too high, the non-woven fabric may become coarse and the tactile sensation may be deteriorated.

Alternatively, the surface layer may contain fibers derived from split composite fibers. "Fibers derived from split-type composite fibers" are single fibers formed by splitting split-type composite fibers and consisting of only one section before splitting, fibers consisting of two or more sections, and one fiber. This refers to a fiber in which a part of the split type composite fiber is divided but not divided at all in the other part. Alternatively, if one split-type composite fiber may not be split at all as long as the nonwoven fabric contains fibers formed by splitting the split-type composite fibers, such a split that is not split at all. The type composite fiber is also included in the fiber derived from the split type composite fiber.

Specifically, in the split type composite fiber, at least one of the constituents is divided into two or more in the fiber cross section, at least a part of the constituents is exposed on the fiber surface, and the exposed portion is the fiber. It has a fiber cross-sectional structure that is continuously formed in the length direction. The split type composite fiber may have wedge-shaped sections arranged in a chrysanthemum pattern. Alternatively, the split type composite fiber may be one in which each section is arranged in a layer in the fiber cross section. Further, the split type composite fiber may be a so-called solid split type composite fiber having no continuous cavity portion in the length direction when the fiber cross section is observed, or one or more cavities continuous in the length direction. It may be a so-called hollow split type composite fiber having a portion.

The combination of the components (resins) constituting the split type composite fiber is, for example, polyethylene terephthalate / polyethylene, polyethylene terephthalate / ethylene-propylene copolymer, polypropylene / polyethylene or the like (polyethylene is high density polyethylene, low density polyethylene, etc.). And any one or a combination of linear low density polyethylene).

The fineness of the split-type composite fiber gives ultrafine fibers having a fineness of 0.6 dtex or less, preferably 0.5 dtex or less when divided into each component (that is, when each section becomes one fiber). If it is a thing, it is not particularly limited. In the present embodiment, when the surface layer contains ultrafine fibers as fibers derived from the split type composite fibers, the nonwoven fabric becomes flexible, and the liquid is good due to the fine voids formed between the ultrafine fibers. Is held in.

In order to generate such ultrafine fibers, the fineness of the split type composite fiber is preferably 1dtex or more and 9dtex or less, more preferably 1.5dtex or more and 3.5dtex or less, and even more preferably. , 1.5dtex or more, 2.5dtex or less. Further, the number of divisions into each component in the split type composite fiber (that is, the number of sections in the composite fiber) is preferably, for example, 4 or more and 32 or less, and more preferably 4 or more and 20 or less. Most preferably, it is 6 or more and 10 or less. The lower limit of the fineness of the ultrafine fiber is not particularly limited, but is preferably 0.05 dtex or more.

The fiber derived from the split type composite fiber may be contained in the surface layer in an amount of 10% by mass or more, particularly 30% by mass or more, and more particularly 50% by mass or more. Further, the upper limit of the content of the fiber derived from the split type composite fiber is, for example, 90% by mass, and particularly 70% by mass. If the proportion of fibers derived from the split type composite fiber is too small, the effect of the surface layer containing ultrafine fibers may not be obtained, and if it is too large, the non-woven fabric becomes flexible and stretches during the cutting process. Workability may be reduced, such as by making it easier. Further, since the split type composite fiber is a kind of synthetic fiber, if the ratio of the fiber derived from the split type composite fiber is too large, it may be difficult to hold the liquid, and it may be difficult to impregnate or permeate a predetermined amount of the liquid.

Alternatively, the surface layer may contain synthetic fibers that are not derived from the split composite fibers. Such synthetic fibers are, for example, single fibers, core-sheath type composite fibers, side-by-side type composite fibers, and sea-island type composite fibers. The fineness of such synthetic fibers is not particularly limited, for example, 0.6 dtex or more and 6 dtex or less, particularly 0.8 dtex or more and 4.8 dtex or less, more particularly 1.2 dtex or more and 3.5 dtex or less, and even more particularly 1 It is 5.5 dtex or more and 2.5 dtex or less.

Alternatively, the surface layer may include cellulose fibers and synthetic fibers (particularly split-type composite fibers). In that case, the cellulose fiber may be contained in the surface layer, for example, 20% by mass to 90% by mass, particularly 30% by mass to 70% by mass, and the synthetic fiber may be contained in the surface layer, for example, 10% by mass to 80% by mass. %, Especially 30% by mass to 70% by mass.

The basis weight of the surface layer may be, for example, 5 g / m ² to 50 g / m ² , particularly 10 g / m ² to 45 g / m ² , and more particularly 15 g / m ² to 40 g / m ² . It may be there. If the basis weight of the surface layer is too small, the texture of the entire laminated nonwoven fabric may deteriorate, and if the basis weight is too large, the degree of integration with the spunbonded nonwoven fabric is weakened, and peeling tends to occur easily between layers. be.

The surface layers located on both sides of the spunbonded nonwoven fabric may be the same or different. For example, the basis weight of one surface layer may be greater than that of the other surface layer, or the proportion of regenerated fibers in one surface layer may be greater than that in the other surface layer. Alternatively, both surface layers may differ from each other in two or more parameters selected from the basis weight, fiber type, specific fiber proportions, fineness and the like.

[Composition of the entire laminated non-woven fabric, etc.]
The laminated nonwoven fabric of the present embodiment comprises a laminated nonwoven fabric in which surface layers are arranged on both surfaces of the spunbonded nonwoven fabric, and the spunbonded nonwoven fabric and the surface layer are integrated by entanglement of fibers. .. In this laminated nonwoven fabric, the surface layer may be composed of two or more layers. For example, the side closer to the spunbonded nonwoven fabric may be a layer containing only regenerated fibers or a larger proportion of regenerated fibers, and the farther side may be a layer containing only fibers derived from split-type composite fibers or a layer containing the fibers in a larger proportion.

The entanglement between the fibers of the spunbonded nonwoven fabric and the fibers of the surface layer may be realized by, for example, a high-pressure fluid flow treatment or a needle punching treatment. If the degree of integration between the spunbonded nonwoven fabric and the surface layer, that is, the degree of entanglement between the fibers is too weak, peeling easily occurs between the surface layer and the spunbonded nonwoven fabric, and the handleability is deteriorated. On the other hand, if the degree of integration between the spunbonded nonwoven fabric and the surface layer is too strong, peeling is less likely to occur, but the texture becomes hard.

In the present embodiment, by using the spunbonded nonwoven fabric having V1 / V2 of 1.5 or more as described above, even if the degree of entanglement between the fibers is relatively weak (for example, the entanglement treatment by a high pressure fluid flow). Even if the fluid pressure is reduced), it is possible to obtain a laminated nonwoven fabric in which delamination between layers is unlikely to occur. Specifically, the laminated nonwoven fabric of the present embodiment has a peeling strength in the MD direction between the spunbonded nonwoven fabric and the surface layer, for example, 1.5 N or more, particularly 2.5 N or more, and more particularly 3.0 N or more. At the same time, the degree of entanglement between the fibers is relatively weak, and the tactile sensation can be provided as soft.

The upper limit of the peeling strength of the laminated nonwoven fabric of the present embodiment in the MD direction is, for example, 20N. It may be difficult to obtain a laminated nonwoven fabric having a peeling strength of more than 20 N and a soft texture even when the above-mentioned specific spunbonded nonwoven fabric is used. The peeling strength of the laminated nonwoven fabric of the present embodiment in the MD direction may be, for example, 2.5N to 15N, and particularly may be 3.0N to 10N.

In the laminated nonwoven fabric of the present embodiment, when the surface layer is composed of only cellulose fibers, more preferably the surface layer is composed of only regenerated fibers, the peeling strength of the laminated nonwoven fabric in the MD direction is preferably 2.7N to 10N. , 3.0N to 7.0N, more preferably.
When the surface layer of the laminated nonwoven fabric of the present embodiment contains 10% by mass or more of fibers derived from split-type composite fibers, the peeling strength of the laminated nonwoven fabric in the MD direction is preferably 6.0N to 20N, preferably 6.5. It is more preferably to 11N.

The softness of the texture of the laminated nonwoven fabric of the present embodiment, or the flexibility thereof, can be indicated by, for example, the rigidity measured using a handle ometer. Specifically, the laminated nonwoven fabric of the present embodiment has a rigidity of 0.30N to 1.50N in a dry state, particularly 0.40N to 1.30N, and more particularly 0.50N to 1.20N. It may have the rigidity and softness of. The rigidity can be changed depending on the basis weight of the sheet, but according to the present embodiment, the rigidity in the above range can be obtained by using the specific spunbonded nonwoven fabric and appropriately selecting the basis weight of the laminated nonwoven fabric. It is possible to provide a laminated nonwoven fabric having a weight.

Further, the laminated nonwoven fabric of the present embodiment has a rigidity of 0.40N to 1.10N, particularly 0.50N, measured in a wet state in which 100 parts by mass of the laminated nonwoven fabric is impregnated with 500 parts by mass of water. It may be from 0.95N, more particularly from 0.60N to 0.90N. The flexibility of the laminated nonwoven fabric of the present embodiment is exhibited even in a state of being impregnated with a liquid.

The basis weight of the laminated nonwoven fabric of the present embodiment is appropriately selected depending on the intended use and the like, and may be, for example, 25 g / m ² to 100 g / m ² , particularly 30 g / m ² to 90 g / m ² . In particular, it may be 35 g / m ² to 80 g / m ² . When the laminated nonwoven fabric of the present embodiment is used as a face mask, the basis weight may be, for example, 30 g / m ² to 90 g / m ² , and particularly 35 g / m ² to 85 g / m ² . , More particularly 40 g / m ² to 80 g / m ² .
If the basis weight is too small, the amount that can be impregnated with the liquid may be small. When the weight of the laminated non-woven fabric is large, either the weight of the spunbonded non-woven fabric or the weight of the surface layer is large, but in the former case, the texture of the entire laminated non-woven fabric tends to be hard, and in the latter case. The peeling strength tends to be small.
The weight of the laminated nonwoven fabric of the present embodiment is preferably 2.5 or more, preferably 3.0 or more, to the basis weight of the laminated nonwoven fabric (the basis weight of the laminated nonwoven fabric / the basis weight of the spunbonded nonwoven fabric). Is more preferable, 4.0 or more is more preferable, and 5.5 or more is particularly preferable. When the lower limit of the basis weight ratio is the above-mentioned value, it is possible to easily improve the tactile sensation and liquid retention of the surface layer. The ratio of the basis weight of the laminated nonwoven fabric to the basis weight of the spunbonded nonwoven fabric is preferably 10 or less, more preferably 9.0 or less, and further preferably 8.0 or less. When the upper limit of the basis weight ratio is the above-mentioned value, delamination is less likely to occur and the handleability of the laminated nonwoven fabric can be easily improved.

The specific volume of the laminated nonwoven fabric of the present embodiment may be, for example, 10.0 cm ³ / g to 13.0 cm ³ / g, particularly 10.5 cm ³ / g to 12.5 cm ³ / g, and more particularly 11 It may be 0.0 cm ³ / g to 12.0 cm ³ / g. The specific volume can be obtained from the basis weight and thickness of the laminated nonwoven fabric, and here, the thickness of the laminated nonwoven fabric is measured with a load of 294 Pa of the sample applied. Since the degree of entanglement between fibers is relatively weak in the laminated nonwoven fabric of the present embodiment, it tends to have a relatively large specific volume. A laminated nonwoven fabric having a large specific volume tends to give a fluffy feel, and can hold a relatively large amount of liquid in the voids between fibers.

The laminated nonwoven fabric of the present embodiment may have, for example, a breaking elongation in the MD direction of 30% to 100%, particularly 35% to 80%, and more particularly 40% to 70%. The elongation at break in the CD direction may be 30% to 160%, particularly 50% to 140%, and more particularly 70% to 120%. Further, the laminated nonwoven fabric of the present embodiment may have, for example, a breaking strength in the MD direction of 20N / 5cm to 180N / 5cm, particularly 30N / 5cm to 160N / 5cm, and more particularly 40N / 5cm to. It may be 150N / 5cm, the breaking strength in the CD direction may be 5N / 5cm to 60N / 5cm, particularly 10N / 5cm to 50N / 5cm, and more particularly 17N / 5cm to 40N / 5cm. It may be there.

Further, in the laminated nonwoven fabric of the present embodiment, for example, the stress at 10% elongation in the MD direction may be 1N / 5cm to 50N / 5cm, particularly 5N / 5cm to 40N / 5cm, and more particularly. It may be 10N / 5cm to 30N / 5cm, and the stress at 10% elongation in the CD direction may be 1N / 5cm to 20N / 5cm, particularly 2N / 5cm to 15N / 5cm, and more particularly 2 It may be .5N / 5cm to 10N / 5cm.

The spunbonded nonwoven fabric constituting the laminated nonwoven fabric of the present embodiment has a relatively small degree of crimping and a relatively low mechanical strength, but when integrated with the surface layer, the short fibers and the long fibers are relatively strong. To be entangled, it gives a sheet with relatively high mechanical strength.

[Manufacturing method of laminated non-woven fabric]
In the laminated nonwoven fabric of the present embodiment, a fiber web containing short fibers as a surface layer (hereinafter referred to as "short fiber web") is arranged on both surfaces of the spunbonded nonwoven fabric to create a laminated fiber web, and the laminated fiber web is created. It can be manufactured by a manufacturing method including subjecting a fiber web to an entanglement treatment and integrating the fibers by entanglement with each other. As described above, the spunbonded non-woven fabric has V1 / V2 of 1.5 or more when the volume of one adhesive portion in which the fibers are adhered is V1 and the volume of the fibers contained in the adhesive portion is V2. Is what.
Staple webs can be made by known methods. The form of the staple web may be any form of a card web such as a parallel web, a cross web, a semi-random web and a random web, an air array web, and a wet papermaking web. The staple webs placed on both sides of the spunbonded nonwoven fabric may be different from each other, for example, one may be a parallel web and the other may be a semi-random web.

The entanglement treatment between fibers is preferably a high pressure fluid flow entanglement treatment in which a high pressure fluid flow is injected. The high-pressure fluid is, for example, a high-pressure gas such as compressed air and a high-pressure liquid such as high-pressure water. In the production of a non-woven fabric, a water flow entanglement treatment using high pressure water as a high pressure fluid is often used, and in this embodiment as well, the water flow entanglement treatment is preferably used from the viewpoint of ease of implementation. In the following, a manufacturing method when high-pressure water (hereinafter, also simply referred to as “water flow”) is used as the high-pressure fluid will be described.

The water flow entanglement treatment may be carried out, for example, by placing a laminated fiber web on a plain weave support of 80 mesh to 100 mesh and injecting a water flow onto the web. In the water flow confounding process, water flows with a water pressure of 1 MPa to 15 MPa are applied to the front and back surfaces of the web from nozzles provided with orifices with a hole diameter of 0.05 mm to 0.5 mm at intervals of 0.3 mm to 1.5 mm, respectively. It may be carried out by injecting each time. The water pressure is preferably 1 MPa to 10 MPa, more preferably 1 MPa to 7 MPa. The distance between the nozzle and the web may be, for example, 5 mm to 100 mm, particularly 10 mm to 50 mm. Further, the transport speed of the web on the support may be, for example, 2 m / min to 6 m / min.

The laminated nonwoven fabric obtained by performing the water flow entanglement treatment is subjected to a drying treatment. The drying treatment may be carried out using, for example, a hot air penetration type heat treatment machine (also referred to as an air-through type heat processing machine), a hot air blowing type heat treatment machine, an infrared heat treatment machine, or the like.

[Use of laminated non-woven fabric]
The laminated nonwoven fabric of the present embodiment may be used as a liquid impregnated sheet impregnated with a liquid and used in contact with the skin of a human or an animal. The liquid and its impregnation amount are appropriately selected according to the intended use. The liquid may be impregnated into 100 parts by mass of the nonwoven fabric with, for example, an impregnation amount of 600 parts by mass or more and 2500 parts by mass or less, particularly 600 parts by mass or more and 1500 parts by mass or less, and more particularly. May be impregnated with an impregnation amount of 700 parts by mass or more and 1500 parts by mass or less.

For example, when the liquid impregnated sheet is used as a wiping sheet for removing stains from human skin, 100 parts by mass or more and 1000 parts by mass or less of water or an aqueous solution containing a cleaning component is applied to 100 parts by mass of the non-woven fabric. It may be impregnated with an impregnation amount. More specifically, the liquid-impregnated wipe sheet for interpersonal use is provided as, for example, a hand wipe, a wipe, a menstrual wipe, a makeup remover sheet, a facial cleansing sheet, an antiperspirant sheet, and a nail remover.

When the liquid impregnated sheet is provided as an interpersonal liquid impregnated skin covering sheet such as an interpersonal face mask, a keratin care sheet, a moisturizing sheet and a slimming sheet, a liquid containing an active ingredient (for example, cosmetics) is applied to 100 parts by mass of the non-woven fabric. On the other hand, it may be impregnated with an impregnation amount of 150 parts by mass or more and 2500 parts by mass or less. The active ingredient is, for example, a moisturizing ingredient, a keratin softening ingredient, a cleansing ingredient, an antiperspirant ingredient, a fragrance ingredient, a whitening ingredient, a blood circulation promoting ingredient, an ultraviolet ray preventing ingredient, a slimming ingredient, and the like, but is not limited thereto. ..

The face mask has a shape suitable for covering the face, and further, for example, a portion corresponding to the eyes, nose, and mouth is provided with an opening or a notch by punching, if necessary. Provided. Alternatively, the face mask may be shaped so as to cover only a part of the face (for example, around the eyes, mouth, nose or cheeks). Alternatively, the face mask may be provided as a set consisting of a sheet covering the circumference of the eyes and a sheet covering the circumference of the mouth, or may be provided as a set of sheets covering three or more portions separately.

The keratin care sheet is a sheet that promotes moisturizing and softening of keratin by impregnating it with a liquid (for example, cosmetics) containing keratin softening components and moisturizing components, and a sheet that exerts an effect of promoting removal of excess keratin. Is.
A moisturizing sheet is a sheet used to moisturize or otherwise care for any part of the body (eg, neck, back of hand, neck to chest (also called décolletage)). The moisturizing sheet is impregnated with a liquid (eg, cosmetics) containing a moisturizing ingredient and other active ingredients.
The slimming sheet is used, for example, by being attached to the thigh or abdomen.

Alternatively, the laminated nonwoven fabric of the present embodiment may be used for an objective liquid impregnated sheet used by hitting an object. For example, the laminated nonwoven fabric of the present embodiment may be impregnated with a liquid containing a cleaning agent and provided as a wiping sheet for an objective. The objective wiping sheet may be used for wiping floors, kitchens, toilets, bathtubs, furniture, walls, screen doors, windowpanes, and the like.

When the laminated nonwoven fabric of the present embodiment is used as any liquid impregnated sheet, the surface layer and the spunbonded nonwoven fabric are well integrated, so that delamination is unlikely to occur even if a force is applied during use, and further. Fluffing due to insufficient entanglement of fibers is unlikely to occur. Then, no matter which side is applied to the skin during use of the product, the surface layer containing the staple fibers comes into contact with the skin, so that a soft touch is provided to the user. Further, since the laminated nonwoven fabric of the present embodiment has a relatively small rigidity and a high drape property, it is supple and easily adheres to a portion having irregularities, particularly a face. Further, in the laminated nonwoven fabric of the present embodiment, when the surface layer is a layer containing highly liquid-absorbent fibers, particularly regenerated fibers, the comparison is caused by the fact that the surface layer is not excessively entangled with the spunbonded nonwoven fabric. It exhibits high water retention due to its large specific volume and the liquid absorbency of the fiber itself. Therefore, when a liquid impregnated sheet made of such a laminated non-woven fabric is used for interpersonal use, the user feels a sense of liquid volume, that is, a sense that a sufficient amount of liquid is constantly supplied to the skin and the active ingredient acts on it. Can have.

In the laminated nonwoven fabric of the present embodiment, the spunbonded nonwoven fabric suppresses excessive elongation of the laminated nonwoven fabric, and the surface layer containing short fibers makes the nonwoven fabric relatively bulky. Therefore, the laminated nonwoven fabric of the present embodiment is used. The liquid impregnated sheet used is excellent in handleability. For example, when a liquid impregnated sheet that is folded and stored in a pop-up manner is taken out from a container, even if a force is applied to the sheet, excessive stretching of the sheet is unlikely to occur. Further, when the laminated nonwoven fabric of the present embodiment is used as a face mask, it is easy to open from the folded state, and it is difficult for elongation to occur.

Hereinafter, this embodiment will be described with reference to examples.
The spunbonded non-woven fabric used in this example was prepared as shown in Table 1. In Table 1, PET representing a material is an abbreviation for polyethylene terephthalate, and PP is an abbreviation for polypropylene. The method for measuring the mechanical properties is as described below. t1 and t2 were determined by observing a cross section cut perpendicularly in the thickness direction with an electron microscope (150 to 300 times) without applying a load to the spunbonded nonwoven fabric.

In this example, the following fibers were prepared as the fibers constituting the surface layer.
Regenerated fiber 1: Solitude-spun cellulose fiber with a fineness of 1.7 dtex and a fiber length of 38 mm (trade name: Lyocell (registered trademark), manufactured by Lenzing)
Recycled fiber 2: Viscose rayon with a fineness of 1.7 dtex and a fiber length of 40 mm (trade name: Corona, manufactured by Daiwa Bow Rayon Co., Ltd.)
Split-type composite fiber 1: Fineness of 2.2 dtex, polyethylene terephthalate with a fiber length of 51 mm / high-density polyethylene, split-type composite fiber with 8 divisions (the fineness of the fiber formed by division with the lowest fineness) Is 0.275dtex) (trade name DFS (SH), manufactured by Daiwabo Polytech Co., Ltd.)

(Examples 1 to 4, Comparative Examples 1 to 2)
A staple fiber web containing 100% by mass of regenerated fiber 1 was prepared using a parallel card machine so as to have the basis weight shown in Table 2. Two short fiber webs were created.
Short fiber webs are laminated on both sides of the spunbonded non-woven fabric shown in Table 2 to obtain laminated fiber webs, which are placed on a 90-mesh plain weave support and conveyed at a speed of 4 m / min. , The water flow of the water pressure shown in Table 2 is sprayed once from the side of one surface (“front” in Table 2), and then from the side of the other surface (“back” in Table 2) to Table 2. A water flow entanglement treatment was performed in which a water flow having the indicated water pressure was jetted once. The nozzle used in the water flow entanglement treatment was a nozzle in which orifices having a hole diameter of 0.1 mm were provided at intervals of 0.6 mm, and the distance between the nozzle and the laminated fiber web was set to 20 mm during the treatment. Next, the laminated fiber web after the water flow entanglement treatment was dried using a hot air penetrating heat treatment machine set at 80 ° C. to obtain a nonwoven fabric.

(Examples 5 to 6, Comparative Examples 3 to 5)
Example 1 except that a short fiber web containing 40% by mass of regenerated fiber 2 and 60% by mass of split-type composite fiber 1 was prepared using a parallel card machine so as to have the basis weight shown in Table 2. A non-woven fabric was obtained in the same manner as above.

The evaluation results of each Example and each Comparative Example are shown in Tables 2 and 3.

Each physical property in the table was carried out by the following method.

[thickness]
The thickness of the non-woven fabric was measured using a thickness measuring machine (trade name: THICKNESS GAUGE model CR-60A, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) with a load of 294 Pa applied.
The specific volume was calculated from the basis weight and thickness of the non-woven fabric.

[Rigidity]
The rigidity and softness of the non-woven fabric was measured according to JIS L 1096: 2010 8.21.5 E method (handle ometer method). Specifically, it was measured by the following procedure.
Place the test piece with a length of 20 cm and a width of 20 cm on the sample table so that the measurement direction of the test piece is perpendicular to the slot (gap width 10 mm).
Next, when the blade of the penetrator adjusted to be lowered to 8 mm from the surface of the sample table is lowered and the test piece is pushed in, 6.7 cm (1/3 of the width of the test piece) from either side. At the position, the resistance value against pushing is read at the points where the front and back are different in the vertical direction and the horizontal direction. As the resistance value, the maximum value (N) indicated by the microammeter is read. The total value of the maximum values on the four sides is calculated, and the average value of three times is calculated to obtain the rigidity and softness of the sample.
For wet rigidity, a polyethylene sheet (length 23 cm, width 23 cm, thickness 0.06 mm) is placed under the non-woven fabric in a state where 100 parts by mass of the non-woven fabric is impregnated with 500 parts by mass of distilled water. Was measured. The value obtained by subtracting the measured value of the rigidity of the polyethylene sheet only from the obtained measured value was taken as the hardness at the time of wetting.

[Water retention rate]
The non-woven fabric was cut in the MD direction × CD direction = 100 mm × 100 mm, the mass of the non-woven fabric was measured, and then the non-woven fabric was immersed in distilled water for 2 minutes. Then, the three corners of the non-woven fabric impregnated with distilled water were sandwiched between clothespins and hung, and the mass after 10 minutes was measured, and the water retention rate was calculated according to the following formula.
Water retention rate (%) = [(M2-M1) / M1] x 100
M1: Mass (g) of the non-woven fabric before impregnation with distilled water
M2: Mass (g) of the non-woven fabric after being impregnated with distilled water and suspended for 10 minutes.

[Fracture strength, elongation at break, stress at 10% elongation]
According to JIS L 1096: 2010 8.14.1 A method (strip method), using a constant-velocity tension type tensile tester, the conditions are such that the width of the sample piece is 5 cm, the grip interval is 10 cm, and the tensile speed is 30 ± 2 cm / min. In the tensile test, the load value at the time of cutting (breaking strength), the elongation at break, and the stress at 10% elongation were measured. The tensile test was carried out with the longitudinal direction (MD direction) and the transverse direction (CD direction) of the nonwoven fabric as the tensile direction. The evaluation results are all shown by averaging the values measured for the three samples.
The breaking strength at the time of wetting (wet) was measured in a state where 100 parts by mass of the nonwoven fabric was impregnated with 500 parts by mass of distilled water.

[Strong peeling]
Prepare a sample piece with a length of 15 cm (dimensions in the MD direction) and a width of 5 cm (dimensions in the CD direction), and attach tape (Tesa No. 4267 75 mm × 50 m) to both surfaces of the sample piece. After pasting, cut off the tape that sticks out of the sample piece. Only one surface layer (first surface layer) was peeled from the 7.5 cm intermediate layer in the length direction, and the peeled first surface layer was sandwiched 2.5 cm between the chucks of the constant velocity tension type tensile tester, and the remaining intermediate layer. The laminated body of the layer and the surface layer (second surface layer) is also sandwiched between the chucks of the testing machine by 2.5 cm and the gripping interval is set to 10 cm. A tensile test was performed under a condition of a speed of 30 ± 2 cm / min, and the peel strength between the first surface layer and the spunbonded nonwoven fabric was measured, and the maximum value was taken as the peel strength.

Comparing Example 1 and Comparative Example 2, Example 1 showed higher peeling strength. In Example 1 and Comparative Example 2, both of the spunbonds used had a basis weight of 10 g / m ² , but the V1 / V2 of the spunbonded nonwoven fabric used in Comparative Example 2 was as small as 1.4, and long fibers. Was more firmly bonded at the bonded part. Therefore, in Comparative Example 2, it is considered that the degree of entanglement between the fibers between the surface layer and the spunbonded nonwoven fabric was smaller than that in Example 1, and the peeling strength was smaller. Moreover, the rigidity of Example 1 was smaller than that of Comparative Example 2. It is considered that this is because the V1 / V2 of the spunbonded nonwoven fabric used in Comparative Example 2 is smaller, the fibers are firmly adhered to each other at the adhesive portion, and the spunbonded nonwoven fabric itself is harder.
The same applies to the peel strength and the rigidity and softness of Example 2 and Comparative Example 1.

Comparing the peeling strengths of Examples 1 to 3, the larger the basis weight of the spunbonded nonwoven fabric, the larger the peeling strength tends to be, and the peeling of Example 3 using the spunbonded nonwoven fabric having a basis weight of 20 g / m ² . The power is especially great. It is considered that this is because the larger the basis weight, the larger the apparent number of fibers per unit area of the nonwoven fabric, and the greater the chance of entanglement with the fibers in the surface layer. On the other hand, Example 3 using the spunbonded non-woven fabric having a basis weight of 20 g / m ² has a slightly harder texture than Examples 1 and 2, and actually has high rigidity and softness, especially when wet. It was a thing.
The peeling strength of Example 4 is smaller than that of Example 1. The V1 / V2 of the spunbonded nonwoven fabric used in Example 4 is about half that of the spunbonded nonwoven fabric used in Example 1, and since the bonded portion is more strongly bonded, the fibers between the layers are bonded in Example 4. It is considered that the degree of entanglement of the above was smaller than that of Example 1.

Examples 5 and 6 containing fibers derived from split-type composite fibers in the surface layer showed smaller stiffness and softness and higher peel strength as compared with Examples 1 to 4. It is considered that this is because the ultrafine fibers formed by the division of the split type composite fibers soften the entire non-woven fabric, and the ultrafine fibers and the ultrafine fibers and the long fibers are well entangled with each other.

Comparing Example 5 and Comparative Example 4, Example 5 showed higher peel strength and there was not much difference in stiffness and softness. The reason why the peeling strength of Example 5 is higher is as described in relation to the comparison between Example 1 and Comparative Example 2. The reason why there is no big difference in the rigidity is not clear, but it is considered that the effect of improving the flexibility of the nonwoven fabric by the ultrafine fibers exceeds the influence of the degree of adhesion of the spunbonded nonwoven fabric on the rigidity.

Comparing Example 6 with Comparative Example 5, Example 6 showed higher exfoliation strength and less stiffness (both dry and wet). It is considered that these results are due to the fact that V1 / V2 of the spunbonded nonwoven fabric used in Example 6 is larger than V1 / V2 of the spunbonded nonwoven fabric used in Comparative Example 5.

Comparing Example 6 with Comparative Example 3, Example 6 showed higher exfoliation strength and less stiffness (both dry and wet). Comparing the spunbonded nonwoven fabrics used in Example 6 and Comparative Example 3, the fiber diameters and fineness of the constituent fibers are not so different, and those used in Comparative Example 3 have a larger basis weight. In consideration of this, for the same reason as described in Examples 1 to 3, Comparative Example 3 may show a larger peeling strength, but in reality, Example 6 showed a larger peeling strength. It is considered that this is because V1 / V2 of the spunbonded nonwoven fabric used in Example 6 is larger than V1 / V2 of the spunbonded nonwoven fabric used in Comparative Example 3 as described above.

The present embodiment includes the following aspects.
(Aspect 1)
A laminated nonwoven fabric containing a surface layer containing short fibers having a fiber length of 200 mm or less, which is arranged on the surface side of both the spunbonded nonwoven fabric and the spunbonded nonwoven fabric, respectively.
The spunbonded non-woven fabric and the surface layer are integrated by entanglement of fibers.
In the spunbonded nonwoven fabric, V1 / V2 is 1.5 or more when the volume of one adhesive portion formed by adhering fibers to each other is V1 and the volume of the fibers contained in the adhesive portion is V2.
Laminated non-woven fabric.
(Aspect 2)
The laminated nonwoven fabric of aspect 1 in which the surface layer contains 20% by mass or more of cellulose fibers.
(Aspect 3)
The laminated nonwoven fabric of aspect 1 or 2, wherein the surface layer contains fibers derived from split-type composite fibers.
(Aspect 4)
The laminated nonwoven fabric according to any one of aspects 1 to 3, wherein the spunbonded nonwoven fabric has a basis weight of 5 g / m ² to 30 g / m ² .
(Aspect 5)
A liquid impregnating sheet comprising the laminated nonwoven fabric according to any one of aspects 1 to 4.
(Aspect 6)
A liquid impregnated sheet obtained by impregnating the liquid impregnated sheet of aspect 5 with a liquid.
(Aspect 7)
A face mask obtained by impregnating the liquid impregnating sheet of aspect 5 with a liquid.
(Aspect 8)
When the volume of one adhesive portion formed by bonding fibers to each other is V1 and the volume of fibers contained in the adhesive portion is V2, on both surfaces of the spunbonded nonwoven fabric having V1 / V2 of 1.5 or more. A fiber web containing short fibers having a fiber length of 200 mm or less is arranged to prepare a laminated fiber web, and the laminated web is subjected to an entanglement treatment to entangle the spunbonded nonwoven fabric and the short fiber web with each other. A method for manufacturing a laminated nonwoven fabric, which comprises integrating.

The laminated nonwoven fabric of the present embodiment can be used for various liquid impregnated sheets such as cleansing sheets and antiperspirant sheets in addition to face masks.

Claims (8)

A laminated nonwoven fabric containing a surface layer containing short fibers having a fiber length of 200 mm or less, which is arranged on the surface side of both the spunbonded nonwoven fabric and the spunbonded nonwoven fabric, respectively.
The spunbonded non-woven fabric and the surface layer are integrated by entanglement of fibers.
In the spunbonded nonwoven fabric, V1 / V2 is 1.5 or more when the volume of one adhesive portion formed by adhering fibers to each other is V1 and the volume of the fibers contained in the adhesive portion is V2.
Laminated non-woven fabric. The laminated nonwoven fabric according to claim 1, wherein the surface layer contains 20% by mass or more of cellulose fibers. The laminated nonwoven fabric according to claim 1 or 2, wherein the surface layer contains fibers derived from split-type composite fibers. The laminated nonwoven fabric according to any one of claims 1 to 3, wherein the spunbonded nonwoven fabric has a basis weight of 5 g / m ² to 30 g / m ² . A liquid impregnating sheet containing the laminated nonwoven fabric according to any one of claims 1 to 4. A liquid impregnated sheet obtained by impregnating the liquid impregnated sheet according to claim 5 with a liquid. A face mask obtained by impregnating the liquid impregnation sheet according to claim 5 with a liquid. When the volume of one adhesive portion formed by bonding fibers to each other is V1 and the volume of fibers contained in the adhesive portion is V2, on both surfaces of the spunbonded nonwoven fabric having V1 / V2 of 1.5 or more. A fiber web containing short fibers having a fiber length of 200 mm or less is arranged to prepare a laminated fiber web, and the laminated web is subjected to an entanglement treatment to entangle the spunbonded nonwoven fabric and the short fiber web with each other. A method for manufacturing a laminated nonwoven fabric, which comprises integrating.