KR20200090730A - Non-woven fabric for absorbent articles - Google Patents

Abstract

As a nonwoven fabric having a thermoplastic fiber, a single nonwoven fabric is partially folded and has a plurality of laminated portions 1 overlapping three or more layers in the thickness direction, and among the laminated portions 1, located on the first surface side Z1 of the nonwoven fabric Absorbency, in which the first face layer 2 and the second face layer 3 located on the second face side Z2 are flat, and the fibers of the first face layer 2 and the second face layer 3 are oriented in the plane direction Non-woven for goods.

Description

Non-woven fabric for absorbent articles

The present invention relates to a nonwoven fabric for absorbent articles.

Nonwoven fabrics are often used for absorbent articles such as sanitary napkins and diapers. A technique for imparting various functions to this nonwoven fabric is known. Among them, there is a nonwoven fabric that gives movement to the surface of the nonwoven fabric in a concavo-convex shape from the viewpoint of reducing the friction of the skin (for example, the nonwoven fabrics described in Patent Documents 1 to 3). In the concavo-convex shape of the nonwoven fabric, the portion that becomes the convex portion is brought into contact with the skin and is movable.

The nonwoven fabric described in Patent Document 1 has a plurality of protrusions on both sides. The first protrusion and the second protrusion, which are the protrusions on both sides, protrude toward the opposite side of each other and are continuous through the annular wall portion. The constituent fibers of the nonwoven fabric have a radial fiber orientation that converges from the annular wall portion toward the top of the second protrusion toward the thickness direction.

Patent Document 2 discloses a surface sheet having a plurality of convex loop portions facing the wearer's skin. This surface sheet has a two-layer structure in which the fiber layer constituting the loop portion is partially bonded to the base layer. In the structure, between the joints, the roof portion is raised so as to protrude largely in the direction toward the skin side of the wearer.

Patent Document 3 discloses a nonwoven fabric having a three-dimensional shape that is sufficiently determined even when compressed, as used for an absorbent article. Specifically, the nonwoven fabric has a protrusion that extends outward from the first surface. The protrusion has a cap portion similar to the mountain portion of the mushroom, and does not have a hinge structure that allows folding.

Japanese Patent Application Publication No. 2013-119012 Japanese Patent Application Publication No. 2004-121701 Japanese Patent Publication No. 2017-528614

The present invention provides a nonwoven fabric having a thermoplastic fiber.

In the embodiment, a single nonwoven fabric is partially folded and has a plurality of laminated portions overlapping three or more layers in the thickness direction.

In the embodiment, among the stacked portions, the first surface layer located on the first surface side of the nonwoven fabric and the second surface layer located on the second surface side are flat.

In the embodiment, the fibers of the first surface layer and the second surface layer are oriented in the plane direction.

In an embodiment, the nonwoven fabric is a nonwoven fabric for absorbent articles.

In the embodiment, a heat-sealed portion is provided between the fibers of each layer of the nonwoven fabric, and the laminated portion has a folding structure without intervening bonding means.

In the embodiment, when viewed from the plane of the nonwoven fabric, a layered portion is provided between the adjacent laminated portions.

In the embodiment, the first face layer has a fiber of 2.4 dtex or less.

In the embodiment, the basis weight of the first surface layer is larger than the basis weight of the second surface layer.

In the embodiment, there are a plurality of regions in which the layered portion extends in one direction as viewed from the plane of the nonwoven fabric.

In the embodiment, when viewed from the plane of the nonwoven fabric, there is a region of a single layer portion surrounded by the laminated portion.

In the embodiment, the region of the one-layer portion has a curved portion on the outer edge viewed from the plane.

In the embodiment, the boundary between the single layer portion and the laminated portion in the curved portion is arranged on the second surface side of the nonwoven fabric.

In the embodiment, the fibers in the region where the laminated portion extends in one direction have the same orientation direction on at least one side of the first side and the second side of the nonwoven fabric.

In the embodiment, the fibers of the first surface layer of the laminated portion and the fibers of the single layer portion show the same orientation direction.

In an embodiment, there is an area having a single layer portion between the adjacent stacked portions as viewed from the plane of the nonwoven fabric, and the single layer portion extending in one direction.

In the embodiment, there is an area in which the one-layer portion extends in one direction orthogonal to the one direction.

In the embodiment, there is a region of a laminated portion having a single layer portion and viewed from a plane of the nonwoven fabric, surrounded by the single layer portion.

In an embodiment, there is another one-layer part in the area of the laminated part surrounded by the one-layer part.

In the embodiment, the fibers of the single-layer portion extending in either direction and the fibers of the single-layer portion extending in one direction orthogonal to the above-described one direction show the same orientation direction.

In the embodiment, when the first surface layer or the second surface layer is flat, the first surface layer or the second surface layer is placed on the pedestal downward, and a transparent plate having a load of 35 MPa on the upper side is provided. When placed, it means that the ratio of the area in contact with the transparent plate when viewed from the top is more than a certain value, and optionally, the ratio of the area where the first surface layer or the second surface layer is in contact with the transparent plate is 50% or more and 99% or less Is, preferably 60% or more, more preferably 70% or more, and/or preferably 95% or less, more preferably 90% or less.

In the embodiment, when the fibers of the first surface layer or the second surface layer are oriented in a plane direction, when the nonwoven fabric for absorbent article is observed from the first surface side or the second surface side, and a virtual square is disposed The number of fibers crossing each side of the square (P1) and the cross section along the thickness direction of the first or second side layer are observed, and when a virtual square is arranged, crossing each side of the square By comparing the number of fibers (P2), it means that the number (P1)> number (P2).

In the embodiment, when the fibers of the first surface layer or the second surface layer are oriented in a plane direction, when the nonwoven fabric for absorbent article is observed from the first surface side or the second surface side, and a virtual square is disposed When the number of fibers crossing each side of the square (P1) is observed in a cross section along the thickness direction of the first side layer or the second side layer, and when an imaginary square is placed, crossing each side of the square The ratio (P1/P2) to the number of fibers (P2) is 1.2 or more and 10 or less, preferably 1.5 or more, more preferably 2 or more, and/or preferably 9 or less, more preferably 8 Is below.

In an embodiment, the first face layer has fibers of 0.2 dtex or more and 2.4 dtex or less, preferably has fibers of 0.5 dtex or more, more preferably 0.8 dtex or more, and/or preferably 2 dtex It has the following fibers, and more preferably 1.8 dtex or less.

In the embodiment, the ratio of the basis weight (G1) of the first surface layer to the basis weight (G2) of the second surface layer (the basis weight (G1) of the first surface layer/the basis weight (G2) of the second surface layer) is 1.2 or more 10 or less, preferably 1.5 or more, more preferably 2 or more, and/or preferably 8 or less, more preferably 6 or less.

In the embodiment, when the fibers show the same orientation direction, the surface along the plane direction of the target portion of the nonwoven fabric for absorbent article is observed, and when a virtual square is arranged, fibers crossing two sides in one direction of the square The ratio (number (P3)/number (P4)) of the number of fibers P4 and the number of fibers P4 intersecting two sides of the other direction of the square (P3) means 1.2 or more in each site to be compared, , Optionally, preferably 1.5 or more, and more preferably 2 or more.

In the embodiment, the apparent thickness H1 under a 35 kPa load is 0.5 mm or more and 5 mm or less, preferably 1 mm or more, more preferably 1.2 mm or more, and/or preferably 4 mm or less, more preferably It is 3 mm or less.

In the embodiment, the apparent thickness H2 under 1 MPa load is 0.2 mm or more and 3 mm or less, preferably 0.3 mm or more, more preferably 0.5 mm or more, and/or preferably 2 mm or less, more preferably It is 1.5 mm or less.

In the embodiment, the ratio of the apparent thickness H2 under the 1 MPa load to the apparent thickness H1 under the 35 MPa load is 10% or more and 80% or less, preferably 20% or more, and more preferably 30%. That's it.

In the embodiment, the ratio of the area (E2) of the laminated portion to the total area (E1) seen from the plane of the nonwoven fabric for absorbent article is 10% or more and 95% or less, preferably 15% or more, and more preferably It is 20% or more.

In the embodiment, a part of the laminated portion is a five-layer portion.

In the embodiment, in the laminated portion, the end portion of the first face layer, the connecting portion of one end of the intermediate layer between the first face layer and the second face layer, the end face of the second face layer and the first face layer The constriction portions are arranged in one or a plurality of portions selected from the connecting portion of the end portion, and the connecting portion of the other end portion of the intermediate layer and the end portion of the second surface layer.

In the embodiment, in the stacked portion, a space portion is disposed between the second surface layer and the intermediate layer between the first surface layer and the second surface layer.

Moreover, this invention provides the absorbent article using the said nonwoven fabric and/or the said nonwoven fabric for absorbent articles.

In the embodiment, the nonwoven fabric and/or the nonwoven fabric for absorbent articles has the first surface layer facing the skin surface side as a surface sheet, and has an absorbent body on the second surface side of the surface sheet.

In the embodiment, the constituent member of the absorbent article is affixed to the second side of the nonwoven fabric and/or the nonwoven fabric for absorbent article, and optionally, 70% of the entire surface of the second side of the nonwoven fabric for absorbent article The adhesive is disposed in an area of less than, and optionally, the ratio of the area of the adhesive to the entire surface of the second side of the nonwoven fabric for absorbent article is preferably 65% or less, even more preferably 50% or less, And/or, preferably 10% or more, more preferably 15% or more, still more preferably 20% or more.

In the embodiment, in the absorbent article in the folded state, the nonwoven fabric of the absorbent article is in the above-described condition.

In the embodiment, in the absorbent article packaging body in which a plurality of absorbent articles are stored, the nonwoven fabric of the absorbent article is in the above-described state.

The above and other features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings as appropriate.

1 is a cross-sectional view schematically showing one preferred embodiment (first embodiment) of the nonwoven fabric for absorbent articles of the present invention.
2A is an enlarged cross-sectional view of the laminated portion shown in FIG. 1, and (B) is an enlarged cross-sectional view showing a modified example of the laminated portion shown in (A).
3 is a plan view of the nonwoven fabric for absorbent article of the first embodiment as viewed from the second side.
4 is a cross-sectional view schematically showing another preferred embodiment (second embodiment) of the nonwoven fabric for absorbent article of the present invention.
5 is a plan view of the nonwoven fabric for absorbent article of the second embodiment as viewed from the second side.
Fig. 6 is an explanatory view schematically showing an example of a preferred method for producing a nonwoven fabric for absorbent articles in the first and second embodiments, wherein (A) is a fibrous web placed on a support male member, It is an explanatory view showing a process of pushing the arm member (雌材) from the fiber web onto the support male member, and (B) is an explanation showing a process of shaping the fiber web by applying a first hot air from above the support arm member. Figure (C) is an explanatory view showing a process of removing the support arm member and spraying the second hot air from above the molded fiber web to fuse the fibers.

The present invention relates to a nonwoven fabric for absorbent articles that simultaneously increases the smooth feel of the nonwoven fabric surface and the anti-scratch property of the skin contacting the nonwoven fabric surface.

In the nonwoven fabric having a concavo-convex shape as described in Patent Literatures 1 to 3, the convex portion (protrusion portion) is moved to follow the skin contacting the surface of the nonwoven fabric, so that rubbing of the skin can be reduced. However, the contact with the skin becomes close to the top of the convex portion (protrusion) and the contact area becomes small. Therefore, there is room for improvement from the viewpoint of the smooth feel of the nonwoven fabric surface.

On the other hand, a smooth touch can be expected in a nonwoven fabric having a flat surface. However, in this case, there is no mobility such as an uneven shape. Therefore, there is room for improvement from the viewpoint of reducing the rubbing of the skin contacting the surface of the nonwoven fabric.

The nonwoven fabric for absorbent articles of the present invention can be made to simultaneously increase the smooth feel on the surface of the nonwoven fabric and the anti-scratch property of the skin contacting the nonwoven fabric surface.

In the present invention, an absorbent article is an article that absorbs and maintains various body fluids such as urine and menstrual blood. For example, various things such as diapers, sanitary napkins, urine pads, and incontinence pads may be mentioned. The absorbent article includes a surface sheet on the skin surface side, a back sheet on the non-skin surface side, and a liquid-absorbing absorbent body disposed between the surface sheet and the back sheet. Moreover, other members may be provided in addition to these as needed. In the member configuration of this absorbent article, it is preferable that the nonwoven fabric for absorbent articles of the present invention is used as a member in a position that comes into contact with the skin. For example, it is preferable to be used as the surface sheet. Moreover, it is preferable to use it as a sheet|cover which covers the non-skin surface side further of the said back sheet.

In the present invention, unless otherwise specified, the side contacting the human body is called the skin surface side, and the side opposite to this is called the non-skin surface side. These are also used as terms for indicating a relative positional relationship in the member configuration of the absorbent article, even for members that do not have a surface that comes into contact with the human body. In addition, when worn, the direction located on the front side of the human body is called the front, and the direction located on the back side is called the rear. The normal direction of the surface or the back surface of the absorbent article is called a thickness direction.

Hereinafter, one preferred embodiment of the nonwoven fabric for absorbent article of the present invention will be described below with reference to the drawings.

1 shows a cross section of a nonwoven fabric 10 for absorbent articles of the first embodiment (hereinafter also simply referred to as a nonwoven fabric 10). The nonwoven fabric 10 has a first surface side Z1 and a second surface side Z2 that is an opposite surface side to the first surface side. The first surface side Z1 and the second surface side Z2 may either be directed toward the absorber side of the absorbent article. In the present embodiment, the first surface side Z1 is represented as the surface side facing outward on the basis of the liquid-absorbent absorbent body in the absorbent article, and the second surface side Z2 is represented as the surface side facing the absorber, It is preferable to use in this way. For example, when the nonwoven fabric 10 is used as a surface sheet, the first surface side Z1 becomes a surface side contacting the skin, and the second surface side Z2 becomes a surface side facing the absorber. In addition, when the nonwoven fabric 10 is a sheet that covers the non-skin surface side by the addition of the back sheet, the first surface side Z1 becomes the outermost surface side (the outermost non-skin surface side) of the absorbent article, and the second surface side ( Z2) is the side facing the absorber.

The nonwoven fabric 10 is a single nonwoven fabric having a thermoplastic fiber. The term "one piece of non-woven fabric" as used herein refers to a thing obtained by heat-sealing a fiber web containing thermoplastic fibers at the intersection of fibers (non-woven fabric by air-through treatment, etc.), and stacking a fiber web before heat-sealing to form a non-woven fabric. It is defined as one nonwoven fabric. Whether or not the fiber webs are laminated before thermal fusion can be determined by microscopic observation of the nonwoven fabric. In the produced nonwoven fabric, if a plurality of fibers are fused (fused beyond the area of the intersection of fibers) and a filmed region is not found, it can be defined as "one piece of nonwoven fabric". For example, having a fusion region (a fusion region spanning multiple fiber intersections) by embossing is "one non-woven fabric bonded together" and not a single nonwoven fabric. The nonwoven fabrics produced by heat-sealing are bonded by an embossing treatment. However, it is not a single nonwoven fabric obtained by laminating another fiber web to a nonwoven fabric produced by heat-sealing and bonding them by an embossing treatment. In addition, in the step after nonwoven fabric of the fiber web, for example, in the step of sandwiching the nonwoven fabric in the absorbent article, embossing may be performed for other purposes such as bonding with other sheets.

The nonwoven fabric 10 has a plurality of laminated portions 1 in which a single nonwoven fabric is partially folded to overlap three or more layers in the thickness direction. In this embodiment, the laminated portion 1 is the first surface layer 2 of the first surface side Z1, the second surface layer 3 of the second surface side Z2, and the like, as shown in the cross section of FIG. The intermediate|middle layer 4 between both layers overlaps in the thickness direction, and consists of three layers. Among the laminated parts 1, the first face layer 2 and the second face layer 3 are flat. In the present invention, the laminated portion is not limited to the three layers of the present embodiment, and may be four or more layers.

Here, overlapping in the thickness direction means that when the imaginary line L1 perpendicular to the thickness direction is drawn with respect to the cross section of the laminated portion 1, the first face layer 2, the intermediate layer 4, and the second face layer 3 It is said that all of these are disposed in a state penetrated by the virtual line L1. In this case, it is not limited to the case where the first surface layer 2, the intermediate layer 4, and the second surface layer 3 all overlap completely, and includes the case where they partially overlap.

In addition, when the first and second surface layers 2 and 3 are flat, the nonwoven fabric 10 is placed on the horizontal pedestal T with the first surface layer 2 or the second surface layer 3 facing downward. When the transparent plate with a load of 35 과 is placed on the upper side, it means that the ratio of the area in contact with the transparent plate is more than a certain level when viewed from the top. At the time of measurement, a nonwoven fabric of 5 cm × 5 cm or more is prepared. The proportion of the area where the first surface layer 2 or the second surface layer 3 is in contact with the transparent plate is preferably 50% or more, more preferably 60% or more, and even more preferably 70% or more from the viewpoint of smooth touch. Do. Moreover, 99% or less is preferable, 95% or less is more preferable, and 90% or less is still more preferable from a viewpoint of not inhibiting movement. Specifically, the proportion of the first surface layer 2 or the second surface layer 3 in contact with the transparent plate is preferably 50% or more and 99% or less, and more preferably 60% or more and 95% or less from the viewpoint of smoothness. Preferably, 70% or more and 90% or less are more preferable.

In the nonwoven fabric 10, the fibers of each of the first surface layer 2 and the second surface layer 3 are oriented in the plane direction. In the flat first surface layer 2 and the second surface layer 3, the fibers are oriented in the plane direction, whereby a smooth touch along the alignment direction is obtained. At the same time, the nonwoven fabric 10 has a flat surface, and in the laminated portion 1, the intermediate layer 4 is used as the axis, and the first surface layer 2 and the second surface layer 3 are opposite to each other. It has a movable movable area (5). By the movable action of this movable region 5, the nonwoven fabric 10 becomes highly followable to the movement of the skin, and has a high anti-scratch property of the skin contacting the surface of the nonwoven fabric. Therefore, the nonwoven fabric 10 simultaneously improves the smooth feel of the nonwoven fabric surface and the anti-scratch property of the skin contacting the nonwoven fabric surface.

Here, the fact that the fibers of each of the first side layer 2 and the second side layer 3 are oriented in the plane direction is observed by observing the nonwoven fabric 10 from the first side (Z1) or the second side (Z2). When arranging the squares, the number of fibers crossing each side of the square (P1) and the cross section along the thickness direction of the first face layer (2) or the second face layer (3) are observed to place a virtual square It means that the number (P2)> number (P2) of fibers is compared by comparing the number (P2) of fibers crossing each side of the square.

The number of fibers (P1 and P2) is specifically measured by the following method. In addition, when a nonwoven fabric is combined as a constituent member of the absorbent article, the adhesive used in the absorbent article is solidified by a cooling means such as cold spray, and the nonwoven fabric to be measured is carefully peeled off and measured. At that time, the adhesive is removed using an organic solvent. Such treatment is similarly performed in other measurement methods in the present specification.

(How to measure the number of fibers (P1 and P2))

(Iii) The nonwoven fabric to be measured is cut into squares of 2 cm x 2 cm to obtain a sample, and the nonwoven fabric is observed from the first side (Z1) or the second side (Z2). For observation, it is preferable to use a scanning electron microscope (SEM), for example. JCM-6100Plus (manufactured by Nihon Electronics Co., Ltd.) is used for the SEM, for example. In SEM observation, it is preferable that the sample is subjected to a vapor deposition treatment in a recommended method in advance.

(Ii) Next, the center of the surface of the first surface layer 2 or the second surface layer 3 is enlarged at a magnification of 50 times with respect to the SEM image, and displayed in the center of the observation screen. Draw an imaginary square with 500 mu m on one side, with the center of the screen as the intersection of diagonal lines, and count the number of fibers (P1) intersecting each side of the square.

(Iii) Similarly, for a cross section along the thickness direction of the first side layer 2 or the second side layer 3, draw an imaginary square having 500 mu m on one side, and the number of fibers crossing each side of the square Count (P2).

(Iii) These are measured and averaged at any three points on the nonwoven fabric to be measured. The average value is taken as the number of fibers (P1 and P2) of the nonwoven fabric to be measured, respectively. At this time, at any three points, the angle of each side of the square is not changed with respect to the nonwoven fabric. That is, the side of the square measuring P1 at the first point and the side of the square measuring P1 at the second point should be parallel. In addition, at the first point, P1 is defined as P1 which has more fibers than P2.

The ratio (P1/P2) of the number of fibers (P1) to the number of fibers (P2) obtained by the above measurement is preferably 1.2 or more from the viewpoint of further enhancing the smooth feel of the surface of the nonwoven fabric 10, 1.5 or more are more preferable, and 2 or more are more preferable. Moreover, the said ratio (P1/P2) is 10 or less from a viewpoint of the strength balance of a nonwoven fabric, 9 or less is more preferable, and 8 or less is still more preferable. Specifically, the ratio (P1/P2) is preferably 1.2 or more and 10 or less, more preferably 1.5 or more and 9 or less, and even more preferably 2 or more and 8 or less.

It is preferable that the nonwoven fabric 10 has a heat-sealed portion between the fibers of each layer (each layer of the laminated portion 1) and has a folding structure without intervening bonding means. It is preferable that such a structure is arrange|positioned in the 1st surface layer 2 and the 2nd surface layer 3 of the laminated|stacked part 1, In addition, it is more preferable that it is arrange|positioned in the intermediate|middle layer 4. Each layer is maintained in shape by heat fusion, and each layer is folded without intervening means, so that the first and second layers 2 and 3 are interposed with the intermediate layer 4 as an axis. The movement can be done smoothly.

In the nonwoven fabric 10, the laminated portion 1 serving as the movable region 5 has the following structure. That is, as shown in FIG. 2(A), one end 4A of the intermediate layer 4 is connected to the end 2A of the first surface layer 2. The other end 4B of the intermediate layer 4 is connected to the end 3A of the second face layer 2. One end 4A of the intermediate layer 4 and the other end 4B do not overlap in the thickness direction. Thereby, the 1st surface layer 2, the intermediate layer 4, and the 2nd surface layer 3 overlap in the thickness direction. The connecting portion of the first surface layer 2, the intermediate layer 4, and the second surface layer 3 serves as a starting point (folded line portion) of folding. Then, the laminated portion 1 is folded in a Z-shape as viewed from the cross section without intervening connecting means.

Thereby, the 1st surface layer 2 and the 2nd surface layer 3 connected to the both ends 4A, 4B of the intermediate|middle layer 4 are moved so that it may push in the opposite direction with respect to the intermediate|middle layer 4, and are laminated. Part (1) is movable. At this time, the stacked portion 1 follows the plane direction in which the connecting portion of the first surface layer 2 and the intermediate layer 4 and the connecting portion of the intermediate layer 4 and the second surface layer 3 were arranged side by side before operation. It will work.

For example, when the nonwoven fabric 10 is used as the surface sheet of the absorbent article, the second surface layer 3 of the nonwoven fabric 10 is fixed to the absorbent body, and the first surface layer 2 is brought into contact with the skin. About the 1st surface layer 2, the shear force in the plane direction is applied by the skin which contacts. At that time, the laminated portion 1 functions as follows. In other words, the first surface layer 2 is intended to move following the skin, so that one end 4A of the intermediate layer 4 is pulled. Then, one end 4A is moved in the plane direction so as to approach the position of the other end 4B. Thereby, with respect to the fixed second surface layer 3, the first surface layer 2 follows the skin and moves in the plane direction. For this reason, although the flat first surface layer 2 is provided, a movable action such as an uneven shape can be exhibited.

In the cross section of this laminated portion 1, the angle θ1 between the intermediate layer 4 and the first surface layer 2 and the angle θ2 between the intermediate layer 4 and the second surface layer 2 are stacked, respectively. It is preferable that it is an acute angle from a viewpoint of making the structure of the part 1 overlapped in the thickness direction. Specifically, the angle θ1 and the angle θ2 are preferably 30° or less, more preferably 20° or less, even more preferably 10° or less, and the smaller the better. However, more than 1° is realistic. By setting the angles θ1 and θ2 to the above range, it is possible to realize a smooth touch on the surface of the nonwoven fabric, and to further develop the mobility in the plane direction described above.

In the nonwoven fabric 10, from the viewpoint of further improving the above-described mobility, as shown in Fig. 2(B), the end portion 2A of the first surface layer 2 and the end portion 4A of one of the intermediate layer 4 The connecting portion, the connecting portion between the end portion 3A of the second surface layer 3 and the end portion 2A of the first surface layer 2, and the other end portion 4B and the second surface layer 3 of the intermediate layer 4 It is preferable that one or a plurality of portions selected from the connecting portion of the end portion 3A have a locking portion 6 that can be a hinge of the movable region 5. Further, from the same viewpoint, between the intermediate layer 4 and the second surface layer 3, a stem-shaped space portion 13 connected to the opening 12 of the first surface side Z1 is arranged. It is preferred.

In the nonwoven fabric 10, the direction of folding of the laminated portion 1 may be the same as shown in FIG. 1, or may be different for each laminated portion 1. Moreover, the size of the laminated portion 1 in the plane direction may be the same or different.

And the size of the opening part 12 of the 1st surface side Z1 may be the same, and may differ for every laminated part 1. However, from the viewpoint of enhancing the smooth feel on the first surface side Z1, it is preferable that the area ratio of the opening 12 occupied by the entire area on the first surface side Z1 of the nonwoven fabric 10 is as small as possible. Do. Specifically, the area ratio of the opening 12 occupied by the entire area on the first surface side Z1 of the nonwoven fabric 10 is preferably 3% or more and 30% or less, more preferably 5% or more, Moreover, 20% or less is more preferable.

When viewed from the plane of the nonwoven fabric 10, as shown in FIG. 3, it is preferable that the one-layer part 7 is arrange|positioned between the adjacent laminated parts 1. As shown in FIG. When the one-layer part 7 is interposed, the several laminated parts 1 are arrange|positioned, respectively. Then, the plurality of stacked portions 1 can be independently moved in the plane direction, and the anti-slip properties of the skin can be further improved. In addition, with the first layer portion 7 as a starting point, there is a greater room for the overlap of the laminated portion 1 to develop. That is, the movable range of the movable area 5 can be enlarged.

The first layer portion 7 may be disposed on either the first surface side Z1 or the second surface side Z2, but from the viewpoint of enhancing the smooth feel on the first surface side Z1, the first surface side Z1 It is preferably placed in.

In the nonwoven fabric 10, from the viewpoint of realizing a smoother feel, it is preferable that the first surface layer 2 has fibers of 2.4 dtex or less, more preferably have fibers of 2 dtex or less, and more than 1.8 dtex It is more preferable to have fibers. Moreover, from the viewpoint of the manufacture of a fiber or a nonwoven fabric, it is preferable to have a fiber of 0.2 dtex or more in the first surface layer 2, it is more preferable to have a fiber of 0.5 dtex or more, and it is more preferable to have a fiber of 0.8 dtex or more. Specifically, it is preferable to have fibers of 0.2 dtex or more and 2.4 dtex or less in the first surface layer 2, more preferably 0.5 dtex or more and 2 dtex or less fibers, and 0.8 dtex or more and 1.8 dtex or less fibers It is more preferable.

Moreover, in the nonwoven fabric 10, it is preferable that the basis weight G1 of the 1st surface layer 2 is larger than the basis weight G2 of the 2nd surface layer 3 from a viewpoint of realizing a smoother touch. From the same viewpoint, the ratio of the basis weight G1 of the first surface layer 2 to the basis weight G2 of the second surface layer 3 (the basis weight G1 of the first surface layer/the basis weight G2 of the second surface layer) ) Is preferably 1.2 or more, more preferably 1.5 or more, and even more preferably 2 or more. Moreover, the said ratio (basis weight (G1) of a 1st surface layer / basis weight (G2) of a 2nd surface layer) is 10 or less from a viewpoint of maintaining the nonwoven fabric strength of the 2nd surface side (Z2), and 8 or less is more It is preferable, and 6 or less is more preferable. Specifically, the ratio (the basis weight (G1) of the first surface layer/the basis weight (G2) of the second surface layer) is preferably 1.2 or more and 10 or less, more preferably 1.5 or more and 8 or less, and furthermore 2 or more and 6 or less desirable.

In addition, it is preferable that the nonwoven fabric 10 has the following structure in plan view, as shown in FIG. 3.

That is, it is preferable that there are a plurality of regions 14 in which the laminated portion 1 extends in one direction, as viewed from the plane of the nonwoven fabric 10. In FIG. 3, the regions 14 where the laminated portion 1 extends are lined up in parallel in a plurality of spaced apart directions in the width direction X toward the longitudinal direction Y of the nonwoven fabric 10. The extending direction is not limited to the longitudinal direction (Y) shown in FIG. 3, but may be a width direction (X) orthogonal to the longitudinal direction (Y), or may be various directions crossing these. In addition, the longitudinal direction (Y) and the width direction (X) of the nonwoven fabric 10 are a machine direction (MD) direction at the time of manufacture, and a cross direction (Cross Direction) CD orthogonal to this.

In this way, when there are a plurality of regions 14 where the stacked portion 1 extends, the stacked portion 1 can be uniformly arranged side by side, making it easier to obtain a smooth feel without being bumpy.

Moreover, in the laminated part 1 of the nonwoven fabric 10 shown in FIG. 3, the connection part of the 1st surface layer 2 and the intermediate|middle layer 4 shown in FIG. 1, and the intermediate|middle layer 4 and the 2nd surface layer 3 ) Are connected side by side in the width direction (X). Therefore, the laminated portion 1 is intended to move in the width direction (X). Thus, the extending direction (the longitudinal direction Y in FIG. 3) of the region 14 where the laminated portion 1 extends and the direction in which the laminated portion 1 moves (X direction in FIG. 3) are different. This is preferable from the viewpoint of achieving both a smooth touch and anti-wrinkle properties of the skin.

Moreover, it is preferable that there is the area 15 of the one-layer part 7 surrounded by the lamination part 1 as seen from the plane of the nonwoven fabric 10. When the single layer portion 7 is surrounded by the laminated portion 1, the movable action of the laminated portion 1 starting from the single layer portion 7 is likely to occur. In addition, the plurality of stacked portions 1 surrounding the one-layer portion 7 are independently movable, but can be operated to interlock and follow the skin. Thereby, the anti-wrinkle property of the skin contacting the nonwoven fabric surface becomes higher.

In addition, it is preferable that the region 15 of the single-layered portion 7 surrounded by the laminated portion 1 has a curved portion 15A at the outer edge viewed from the plane. In Fig. 3, the curved portion 15A has a flat shape curved in a U-shape. However, the curved portion 15A is not limited to the shape shown in FIG. 3 and can take various curved shapes.

When the region 15 of the single-layer portion 7 has the curved portion 15A, the operation of the laminated portion 1 becomes smoother, and the rubbing of the skin can be further suppressed.

Moreover, it is preferable that the boundary between the one-layer part 7 and the lamination part 1 in the curved portion 15A is arranged on the second surface side Z2 of the nonwoven fabric 10. Thereby, the step difference of the boundary of the one-layer part 7 and the lamination part 1 in the curved part 15A is arrange|positioned on the 2nd surface side Z2 of the nonwoven fabric 10, and in 1st surface side Z1 Can maintain a smooth touch.

In addition, all the regions 14 in which the stacked portion 1 extends in one direction may all have the same width or may have different widths. In addition to this, apart from the region 15 of the single-layer portion 7, another single-layer portion along the extending direction of the region 14 may be further provided in the region 14 (not shown).

The fibers of the region 14 in which the laminated portion 1 extends in one direction have the same orientation direction in at least one of the first surface side Z1 and the second surface side Z2 of the nonwoven fabric 10. It is preferable to show. When the laminated portion 1 constituting the movable region 5 exhibits a constant orientation direction, a smoother feel is obtained. From this viewpoint, it is preferable that the fibers of the first surface layer 2 among the stacked portions 1 exhibit the same orientation direction in each of the extended regions 14 of the stacked portion 1. In particular, the direction in which the orientation of the fibers of the first surface layer 2 is orthogonal to the moving direction of the laminated portion 1 (the width direction X in FIG. 3) (the longitudinal direction in FIG. 3 (Y )) is preferred. Moreover, it is preferable that the fibers of the second surface layer 3 and the intermediate layer 4 in the stacked portion 1 exhibit the same orientation direction in each of the extended regions 14 of the stacked portion 1. In particular, the orientation direction of the fibers of the second side layer 3 and the intermediate layer 4 is a direction perpendicular to the orientation direction of the fibers of the first side layer 2, that is, the direction in which the laminated portion 1 is movable, It is preferable from the viewpoint of increasing the mobility of the laminated portion 1.

Moreover, it is preferable that the fibers of the first surface layer 2 of the laminated portion 1 and the fibers of the single layer portion 7 exhibit the same orientation direction. Thereby, a smoother feel is obtained on the first surface side Z1 of the nonwoven fabric 10.

As described above, when the fibers show the same orientation direction, the surface along the plane direction of the target portion of the nonwoven fabric 10 is observed, and when the imaginary square is arranged, the fibers crossing two sides in one direction of the square The ratio (number (P3)/number (P4)) of the number P4 of fibers intersecting two sides of the number P3 and the other side of the square means that it is 1.2 or more in each part to be compared. The ratio is preferably 1.5 or more, more preferably 2 or more, in each site to be compared. In the measurement between the parts observed at this time, the angle of each side of the square is not changed with respect to the nonwoven fabric. That is, the side of the square measuring the first P3 and the side of the square measuring P3 at another site to be observed next should be parallel. In addition, P3 initially defines P3 as the larger number of fibers than P4.

The number of fibers (P3 and P4) described above can be measured in accordance with the above-described (method for measuring the number of fibers (P1 and P2)). In addition, the surface to be observed of the target site may be any one of the first surface side (Z1) and the second surface side (Z2) in the target site.

Next, the nonwoven fabric 20 for absorbent articles of the second embodiment (hereinafter sometimes simply referred to as the nonwoven fabric 20) will be described. Hereinafter, the difference from the nonwoven fabric 20 for absorbent articles of 2nd Embodiment is demonstrated with respect to the nonwoven fabric 10 for absorbent articles of 1st Embodiment. In the nonwoven fabric 20 for absorbent articles of 2nd Embodiment, the same code|symbol is attached|subjected about the part etc. which are common with the nonwoven fabric 10 for absorbent articles of 1st Embodiment.

4 and 5 show the nonwoven fabric 20 of the second embodiment. The nonwoven fabric 20 of the second embodiment is different from the nonwoven fabric 10 of the first embodiment in the plane direction arrangement of the laminated portion 1. Regarding other matters, the nonwoven fabric 20 of the second embodiment has a plurality of laminated portions 1, similarly to the nonwoven fabric 10 of the first embodiment, and includes the first surface layer 2 and the second surface layer. (3) This flat, and both layers of fibers are oriented in the plane direction, and various preferred aspects shown for the nonwoven fabric 10 of the first embodiment are suitably applied.

In the nonwoven fabric 20, as shown in the sectional view shown in Fig. 4, the one-layer portion 7 is arranged between the adjacent laminated portions 1. The nonwoven fabric 20 is a single-layer part 7, a single-layer part 71 of the first surface side Z1 (hereinafter also referred to as a surface single-layer part 71) and a single-layer part 72 of the second surface side Z2 (Hereinafter, it is also referred to as a back side one-layer part 72). The surface one-layer part 71 is continuous with the first surface layer 2 of the laminated part 1, and constitutes a flat surface of the first surface side Z1 of the nonwoven fabric 20. The back surface single-layer part 72 is continuous with the second surface layer 3 of the laminated part 1 and constitutes a flat surface of the second surface side Z2 of the nonwoven fabric 20.

In the nonwoven fabric 20, it is preferable to have the region 21 in which the single-layer part 7 extends in one direction, as shown in the plan view shown in FIG. Moreover, it is preferable that the area|region 22 in which the one-layer part 7 extends in one direction orthogonal to any one said direction. The surface single layer portion 71 is mentioned as the single layer portion 7 constituting the regions 21 and 22. In the one direction mentioned above and the direction orthogonal to the one direction, in FIG. 5, it shows as the longitudinal direction (Y) and the width direction (X). However, it is not limited to these directions, and includes various directions in the plane of the nonwoven fabric 20.

In the nonwoven fabric 20, there is at least either one of the region 21 and the region 22 where the surface single layer portion 71 extends, so that the surface single layer portion 7 is uniformly aligned side by side, without being uneven and smooth. You can do it more easily.

Moreover, it is preferable that there is the area|region 23 of the laminated|stacked part 1 surrounded by the one-layer part 7 as seen from the plane of the nonwoven fabric 20. As this aspect, what has the area|region 23 of the laminated|stacked part 1 in the area|region 21 and the area|region surrounded by the area|region 22 extending in the surface single layer part 71 is mentioned. In this aspect, the regions 23 of the stacked portion 1 are equally spaced in the grid formed by the orthogonal regions 21 and 22 of the surface layer portion 71, and are regularly arranged. It is done. It is a structure in which the laminated portion 1 is supported like a pumice stone with respect to the entire flat surface of the nonwoven fabric 20. Moreover, the movable region 5 is configured in the same manner as in the above-described first embodiment in the laminated portion 1. Thereby, the plane of the nonwoven fabric 20 can be flexibly followed in all directions in accordance with the movement of the skin, so that the anti-wrinkle property of the skin can be further improved. In addition, the plurality of stacked portions 1 form the thickness of the nonwoven fabric 20 over the entire plane, and also acts like a soft spring to impart cushioning properties.

Moreover, it is preferable that the region 24 of another one-layer portion 7 is further included in the region 23 of the laminated portion 1. As the single-layer part 7 constituting the region 24, the rear-layer part 72 is mentioned. The plurality of stacked portions 1 having the above-described action, with the region 24 of the single-layer portion 7 as one of the starting points, can be easily moved in any direction at 360° C., further improving the anti-wrinkle property of the skin. have.

In addition, when viewed from the plane of the nonwoven fabric 20, the fibers of the single layer portion 7 extending in one direction and the fibers of the single layer portion 7 extending in one direction orthogonal to the one direction show the same orientation direction. desirable. Specifically, the fibers in the region 21 in which the surface single layer portion 71 extends in the longitudinal direction Y, and the fibers in the region 22 in which the surface single layer portion 71 extends in the width direction X It is preferable that indicates the same orientation direction. Thereby, the 1st surface side Z1 of the nonwoven fabric 20 becomes a smoother touch. In addition, that the fibers referred to here are in the same orientation direction has the same meaning as the contents shown in the definitions given for the nonwoven fabric 10 of the first embodiment. The number of fibers (P3 and P4) is also measured by the same method as above. Also in 2nd embodiment, the preferable range shown with respect to 1st embodiment is applicable.

In the above, the nonwoven fabric 10 for absorbent articles of 1st Embodiment and the nonwoven fabric 20 for absorbent articles of 2nd Embodiment can be combined suitably in the range which does not contradict each other. For example, in the nonwoven fabric 20 for absorbent articles of the second embodiment, as the planar arrangement of the laminated portion 1 shown in the cross-sectional view in FIG. 4, the laminated portion 1 as in the first embodiment is of the nonwoven fabric plane An aspect in which the region extending in one direction is disposed adjacent to the region 21 or the region 22 extending from the single-layer portion 7 may be mentioned (not shown).

Further, in the nonwoven fabric 10 for absorbent articles of the first embodiment and the nonwoven fabric 20 for absorbent articles of the second embodiment, a part of the laminated portion 1 may be a five-layer portion. Specifically, the two-layer portion of the intermediate layer 4 and the second surface layer 3 of the laminated portion 1 may be stacked on the other laminated portion 1 adjacent to it to form a five-layer portion. (Not shown). Thereby, the thickness is increased, the cushioning property is increased, and the soft skin texture can be enhanced.

The nonwoven fabric 10 for absorbent articles of these 1st Embodiment and the nonwoven fabric 20 for absorbent articles of 2nd Embodiment can be manufactured by the method shown in FIG. In FIG. 6, the support male member 120 and the support arm member 130 for shaping the fiber web 110 before non-woven fabric are used. It is produced by compressing a nonwoven fabric precursor obtained by extruding in the thickness direction. When compressing in the thickness direction, it is preferable to perform while applying temperature.

First, as shown in FIG. 6(A), the fiber web 110 is placed on the support male member 120, and is pressed into the support member arm member 130 from above the fiber web 110 to be molded.

The support member 120 has a plurality of protrusions 121 standing vertically on the substrate. A concave portion 122 is formed between the protrusions 121 and 121, and the concave portion 122 is arranged in a lattice shape.

The support arm member 130 has a projection 131 corresponding to the recess 122 of the support male member 120. Between the projections 131 and 131, a concave portion 132 corresponding to the projection 121 of the support male member 120 is formed. In the first embodiment, the projections 131 and the concave portions 132 have a shape that is continuous in one direction when viewed in a plane, and the projections 131 and the support concave portions 132 alternate in the direction orthogonal to the one direction. Is placed as Specifically, a drum-shaped thing in which a plurality of ring-shaped disks are connected at equal intervals in the direction of the rotation axis can be given. In the second embodiment, the projections 131 are lattice-shaped, and the recesses 132 are disposed inside the lattice.

In the support arm member 130, the distance between the projections 131 and 131 is wider than the width of the projection 121 of the support male member 120. The distance is preferably between the projection 121 of the support male member 120 and the projection 131 of the support arm member 130 sandwiching the fiber web 110 therebetween, and the connection portion 3 in which the fibers are oriented in the thickness direction is preferable. It is set appropriately so that it can be molded properly.

Using the above-described support member 120 and the support arm member 130, a spraying treatment of hot air W1 is optionally performed as shown in Fig. 6B. Subsequently, the support arm member 130 is removed, and hot air W2 as shown in Fig. 6(C) is sprayed, so that the fibers are fused to each other to perform nonwoven fabric fabrication. Finally, the entire plane of the obtained nonwoven fabric precursor is compressed in the thickness direction to produce the nonwoven fabric 10 for absorbent articles of the first embodiment and the nonwoven fabric 20 for absorbent articles of the second embodiment. In addition, both the hot air W1 and the hot air W2 are not always required, and the injection process of the first hot air W1 may be omitted, and only the second hot air W2 may be used. As a method of compressing in the thickness direction, there are, for example, a method of pressing on a calender roll, a method of strongly winding by applying a tension, or a method of compressing by applying a load to the produced nonwoven fabric. When compressing in the thickness direction, it is preferable to perform while applying temperature. By setting this temperature to 30°C or higher, it is easy to be crushed and easy to form a desired shape.

The nonwoven fabric for absorbent articles of the present invention is not limited to the nonwoven fabric 10 for absorbent articles of the first embodiment described above and the nonwoven fabric 20 for absorbent articles of the second embodiment. The nonwoven fabric for absorbent articles of the present invention is a nonwoven fabric having a thermoplastic fiber, having a laminated portion (1), the first face layer (2) and the second face layer (3) are flat, and the fibers of both layers are flat It includes various forms oriented in the direction.

In the nonwoven fabric for absorbent articles of the present invention, the apparent thickness H1 under a 35 MPa load (substantially unloaded) is preferably 0.5 mm or more, more preferably 1 mm or more, from the viewpoint of generating motion. Mm or more is more preferable. Moreover, from the viewpoint of smoothness of the surface, the apparent thickness H1 under the above 35 MPa load is preferably 5 mm or less, more preferably 4 mm or less, and even more preferably 3 mm or less. Specifically, the apparent thickness H1 under the above 35 MPa load is preferably 0.5 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less, and even more preferably 1.2 mm or more and 3 mm or less.

In addition, "apparent thickness" in this invention means the thickness between virtual planes which contact the outermost part of the front and back surfaces in the whole nonwoven fabric for absorbent articles.

Moreover, in the nonwoven fabric for absorbent articles of the present invention, the apparent thickness H2 under 1 MPa load (high load) is preferably 0.2 mm or more, more preferably 0.3 mm or more, from the viewpoint of generating motion, 0.5 mm or more is more preferable. In addition, from the viewpoint of smoothness of the surface, the apparent thickness H2 under the 1 MPa load is preferably 3 mm or less, more preferably 2 mm or less, and even more preferably 1.5 mm or less. Specifically, the apparent thickness H2 under the load of 1 MPa is preferably 0.2 mm or more and 3 mm or less, more preferably 0.3 mm or more and 2 mm or less, and even more preferably 0.5 mm or more and 1.5 mm or less.

In addition, in the nonwoven fabric for absorbent articles of the present invention, the ratio (H2/H1) of the apparent thickness (H2) under 1 MPa load (high load) to the apparent thickness (H1) under 35 MPa load (substantially no load) ) Is preferably 10% or more, more preferably 20% or more, and even more preferably 30% or more, from the viewpoint of smoothness of the surface. The larger the ratio, the better, but 80% or less is realistic.

(Method for measuring apparent thickness of nonwoven fabric for absorbent article of the present invention)

The nonwoven fabric to be measured is cut into 10 cm x 10 cm. If 10 cm × 10 cm cannot be taken, cut to the largest area possible. The thickness under the load is measured using a laser thickness meter (ZSLD80 manufactured by Omron Corporation). Three points are measured, and the average value is taken as the apparent thickness of the nonwoven fabric 10.

In addition, the ratio (E2/E1) of the area (E2) of the laminated portion (1) to the total area (E1) seen from the plane of the nonwoven fabric for absorbent article of the present invention is equal to that of the movable area (5). From the viewpoint of enhancing the action, 10% or more is preferable, 15% or more is more preferable, and 20% or more is still more preferable. The larger it is, the more preferable from the viewpoint of movement, but 95% or less is realistic.

The nonwoven fabric for absorbent articles of the present invention can be sandwiched as various constituent members of absorbent articles, utilizing a smooth touch and anti-wrinkle properties of the skin. For example, the absorbent article is an article used for absorbing liquid discharged from the body, such as a sanitary napkin, panty liner, disposable diaper, and incontinence pad. The nonwoven fabric for absorbent articles of the present invention is preferably used as a surface sheet, a second sheet (a sheet disposed between the surface sheet and the absorbent body) in the absorbent article, an absorbent sheet, a covering sheet surrounding the absorbent body, a leak-proof sheet, or the like.

Especially, it is preferable to make the nonwoven fabric for absorbent articles of this invention into the absorbent article arrange|positioned as a surface sheet, with the 1st surface side facing the skin surface side. It is preferable that the absorber is disposed on the second side of the surface sheet.

Moreover, the structural member of the absorbent article is affixed to the second surface side of the nonwoven fabric for absorbent article of the present invention, and the adhesive is disposed in an area of less than 70% of the entire surface of the second side of the nonwoven fabric for absorbent article of the invention It is preferred. Thereby, the smooth operation|feel of the 1st surface side of the nonwoven fabric for absorbent articles of this invention, and the movable action of the laminated part 1 can be exhibited largely. From this viewpoint, the ratio of the area of the adhesive to the entire surface on the second side of the nonwoven fabric for absorbent article of the present invention is more preferably 65% or less, and even more preferably 50% or less. Moreover, the ratio of the area of the adhesive to the entire surface on the second side of the nonwoven fabric for absorbent article of the present invention is preferably 10% or more from the viewpoint of ensuring stability when the operation of the laminated portion 1 is expressed. , 15% or more is more preferable, and 20% or more is more preferable. Specifically, the ratio of the area of the adhesive to the entire surface on the second side of the nonwoven fabric for absorbent article of the present invention is preferably 10% or more and less than 70%, more preferably 15% or more and 65% or less, and 20% More than 50% or less is more preferable.

The absorbent article used for absorbing the liquid discharged from the body typically has a liquid-retaining absorbent body interposed between the top sheet, the back sheet, and both sheets. As the absorber and the back sheet when the nonwoven fabric for absorbent articles of the present invention is used as a surface sheet, materials commonly used in the art can be used without particular limitation. For example, the absorbent body includes an absorbent core, and optionally a covering sheet surrounding the absorbent core. The absorbent core is exemplified by holding a fiber aggregate composed of a fibrous material such as pulp fibers, an aggregate of absorbent polymers, or a mixture thereof. As the covering sheet, a toilet paper or a nonwoven fabric can be used. As the back sheet, a sheet of a liquid resin impermeable to water repellent such as a film of a thermoplastic resin or a laminate of the film and a nonwoven fabric can be used. The back sheet may have water vapor permeability. The absorbent article may further include various members according to the specific use of the absorbent article. For example, when the absorbent article is applied to a disposable diaper or sanitary napkin, one or two or more pairs of three-dimensional guards may be disposed on both sides of the surface sheet.

Such an absorbent article having the nonwoven fabric for absorbent article of the present invention as a constituent member is folded and distributed to the market. At that time, it becomes an absorbent article package body accommodated in the packaging bag. As the absorbent article packaging body, for example, a plurality of folded absorbent articles are stacked and stored in one packaging bag. Moreover, as the said absorbent article package body, the folded absorbent part article is accommodated in each one packaging bag to become an individual packaging body, and a plurality of individual packaging bodies are stored in one packaging bag again. In the absorbent article in the folded state, it is preferable that the nonwoven fabric of the absorbent article is in the state indicated above as the nonwoven fabric for absorbent article of the present invention. Moreover, it is preferable that the nonwoven fabric of the absorbent article is in a state indicated as the nonwoven fabric for the absorbent article of the present invention in an absorbent article package in which a plurality of absorbent articles are stored.

Example

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to and interpreted thereby. In addition, in this Example, "part" and "%" are all on a mass basis unless otherwise specified. Moreover, the presence or absence of the plane orientation of the fiber was confirmed based on the above-mentioned (method of measuring the number of fibers (P1 and P2)).

(Example 1)

By using the thermoplastic fiber having a fiber diameter shown in Table 1, a nonwoven fabric precursor serving as a nonwoven fabric for absorbent articles corresponding to the first embodiment was produced by the production method shown in FIG. 6. Subsequently, the nonwoven fabric precursor was set to a size of 15 cm × 15 cm, placed on a flat base, and an acrylic plate having a larger area than the nonwoven fabric precursor was placed, and again a 20 kg weight was placed on the acrylic plate. In this state, it was allowed to stand at 50°C for one week to prepare a nonwoven fabric sample 1 for an absorbent article corresponding to the first embodiment.

The obtained nonwoven fabric sample 1 for absorbent articles had a laminated portion, and the basis weights of the first and second cotton layers of the laminated portion and the presence or absence of fiber orientation were as shown in Table 1.

(Example 2)

The nonwoven fabric sample for absorbent articles corresponding to the second embodiment was prepared in the same manner as in Example 1, except that the nonwoven fabric precursor serving as the nonwoven fabric for absorbent articles corresponding to the second embodiment was produced by the manufacturing method shown in FIG. 6. 2 was prepared.

Table 1 shows the basis weights of the first and second cotton layers of the nonwoven fabric sample 2 for absorbent articles, and the presence or absence of fiber orientation.

(Comparative Example 1)

By the air through manufacturing method including the manufacturing process described in the specification paragraph of the document, using the thermoplastic fiber of the fiber diameter shown in Table 1, the uneven nonwoven fabric of the shape shown in FIG. 1 of the above-mentioned patent document 2 A nonwoven fabric sample C1 was prepared. The spraying treatment with the first hot air (W1) was performed under conditions of a temperature of 160°C, a wind speed of 54 m/s, and a spraying time of 3s. The spray treatment with the second hot air was performed under conditions of a temperature of 160°C, a wind speed of 6 m/s, and a spray time of 3 s.

Table 1 shows the basis weights of the top portions of the first protrusions on the first surface side and the top portions of the second protrusions on the second side of the obtained nonwoven fabric sample C1, as shown in Table 1.

(Comparative Example 2)

1 The surface material of Meriz tape type M size (Kao Corporation, 2018, made in Japan) was peeled off by spraying with a cold spray, to prepare a nonwoven fabric sample C2. Table 1 shows the basis weight of the first and second cotton layers of the nonwoven fabric sample C2, and the presence or absence of fiber orientation.

(Comparative Example 3)

Using a thermoplastic fiber having a fiber diameter shown in Table 1, a nonwoven fabric was prepared by an air-through manufacturing method, and a flat nonwoven fabric sample C3 was produced without performing concavo-convex shaping. Table 1 shows the basis weight of the nonwoven fabric sample C3 on the first and second surface sides, and the presence or absence of the plane orientation of the fibers.

The following examples (1) and (2) were tested for the comparative examples.

(1) Smoothness test

The smooth feel was evaluated as a coefficient of friction. Using the surface tester KES-FB4 (trade name, manufactured by Kato Tech Co., Ltd.), on the skin surface side of the nonwoven fabric sample for each absorbent article, on the condition of SENS: 2×5, load 4.9 ㎪/㎡, surface roughness SMD value, average The friction coefficient MIU value and the standard deviation MMD value of the friction coefficient were measured. The surface roughness SMD value indicates that the smaller the value, the smoother the surface. The average friction coefficient MIU value indicates that the surface is not slippery, and the smaller the value, the easier it is to slip. The standard deviation MMD value of the friction coefficient represents the deviation of friction, and the smaller the value, the smaller the smoothness and smoothness of the surface. In particular, the effect of smoothness is thought to depend on the unevenness felt by the fingers. Therefore, the smaller the SMD, the smoother it feels.

(4) movement of the first face layer

The movement of the first surface layer was measured by cutting a nonwoven fabric into 5 cm x 5 cm. A double-sided tape (Nistack NWBB-15 manufactured by Nichiban Co., Ltd.) was installed on the table at 5 cm × 5 cm without gaps. A cut nonwoven fabric was placed thereon, and the second side of the nonwoven fabric was brought into contact with the double-sided tape. In addition, an acrylic plate of 5 cm × 5 cm was placed on the surface of the nonwoven fabric. The double-sided tape was installed on the acrylic plate without a gap, and the acrylic plate was placed so that the double-sided tape contacted the first side of the nonwoven fabric. The double-sided tape and the nonwoven fabric were adhered by applying a load of 3 로부터 from an acrylic plate. In this state, the acrylic plate was moved from side to side, and the length moved was measured. At this time, if the middle layer of the nonwoven fabric exists, it moves. Moved up and down and left and right, the most moved length was measured.

From Table 1, Examples 1 and 2 show that the presence of the intermediate layer produces movement, and the flat surface maintains smoothness.

Although the present invention has been described in conjunction with its embodiments and examples, we do not intend to limit our invention in any detail of the description, unless specifically specified, contrary to the spirit and scope of the invention as set forth in the appended claims. I think it should be interpreted broadly.

1: lamination part
2: First side layer
3: second side layer
4: Middle layer
5: movable area
6: Jalocbu
7: First floor part
10, 20: non-woven fabric for absorbent articles
Z1: 1st side
Z2: 2nd side

Claims (34)

Non-woven fabric having a thermoplastic fiber,
A single nonwoven fabric is partially folded and has a plurality of laminated portions overlapping three or more layers in the thickness direction,
Among the laminated portions, the first surface layer located on the first surface side of the nonwoven fabric and the second surface layer located on the second surface side are flat, and the fibers of the first surface layer and the second surface layer are oriented in a plane direction, Non-woven fabric for absorbent articles. According to claim 1,
A nonwoven fabric for absorbent articles having a heat-sealed portion between the fibers of each layer of the nonwoven fabric, and the laminated portion has a folded structure without intervening bonding means. The method of claim 1 or 2,
A nonwoven fabric for an absorbent article, having a one-layer portion between adjacent lamination portions, as viewed in the plane of the nonwoven fabric. The method according to any one of claims 1 to 3,
A nonwoven fabric for absorbent article, wherein the first side layer has a fiber of 2.4 dtex or less. The method according to any one of claims 1 to 4,
A nonwoven fabric for absorbent article, wherein the basis weight of the first surface layer is greater than the basis weight of the second surface layer. The method according to any one of claims 1 to 5,
A nonwoven fabric for an absorbent article having a plurality of areas in which the laminated portion extends in one direction, as viewed from the plane of the nonwoven fabric. The method according to any one of claims 1 to 6,
A nonwoven fabric for absorbent articles, having a region of one layer portion surrounded by the laminated portion, as viewed from the plane of the nonwoven fabric. The method of claim 7,
The non-woven fabric for absorbent article, wherein the area of the first layer portion has a curved portion on an outer edge viewed from a plane. The method of claim 8,
The nonwoven fabric for absorbent articles in which the boundary between the one-layer portion and the laminated portion in the curved portion is disposed on the second surface side of the nonwoven fabric. The method according to any one of claims 6 to 9,
The nonwoven fabric for absorbent articles wherein the fibers in the region where the laminated portion extends in one direction have the same orientation in at least one side of the first side and the second side of the nonwoven fabric. The method according to any one of claims 1 to 10,
A nonwoven fabric for absorbent articles, wherein the fibers of the first surface layer of the laminated portion and the fibers of the single layer portion exhibit the same orientation direction. The method according to any one of claims 1 to 5,
A nonwoven fabric for an absorbent article, having a layered portion between adjacent stacked portions, as viewed from the plane of the nonwoven fabric, and having a region in which the layered portion extends in one direction. The method of claim 12,
A nonwoven fabric for an absorbent article having an area in which the one-layer portion extends in one direction orthogonal to the one direction. The method according to any one of claims 1 to 5, 12 and 13,
A nonwoven fabric for absorbent articles, having a single layer portion and having a region of a laminated portion surrounded by the single layer portion, as viewed in the plane of the nonwoven fabric. The method of claim 14,
A nonwoven fabric for an absorbent article, further comprising another one layer portion in the area of the laminated portion surrounded by the one layer portion. The method of claim 13,
The nonwoven fabric for absorbent articles in which the fibers of the one-layer portion extending in either direction and the fibers of the one-layer portion extending in one direction orthogonal to the above-described one direction exhibit the same orientation direction. The method according to any one of claims 1 to 16,
When the first face layer or the second face layer is flat, the first face layer or the second face layer is placed on the pedestal with the lower side, and when a transparent plate with a load of 35 에 is placed on the upper side, the transparent plate is seen from the top. It means that the ratio of the area in contact with the portion is equal to or greater than the predetermined value, and the ratio of the area where the first surface layer or the second surface layer is in contact with the transparent plate is 50% or more and 99% or less, preferably 60% or more, and more The nonwoven fabric for absorbent articles, preferably 70% or more, and more preferably 95% or less, and more preferably 90% or less. The method according to any one of claims 1 to 17,
When the fibers of the first surface layer or the second surface layer are oriented in a plane direction, the nonwoven fabric for absorbent article is observed from the first surface side or the second surface side, and the square of the square when the virtual square is arranged The number of fibers crossing the side (P1) and the cross section along the thickness direction of the first or second side layer, and when arranging an imaginary square, the number of fibers crossing each side of the square ( By comparing P2), the number (P1)> number (P2) means that the nonwoven fabric for absorbent articles. The method according to any one of claims 1 to 18,
When the fibers of the first surface layer or the second surface layer are oriented in a plane direction, the nonwoven fabric for absorbent article is observed from the first surface side or the second surface side, and the square of the square when the virtual square is arranged The number of fibers crossing each side of the square when an imaginary square is arranged by observing a cross section along the thickness direction of the first side layer or the second side layer of the number of fibers P1 crossing the side ( The nonwoven fabric for absorbent article wherein the ratio (P1/P2) to P2) is 1.2 or more and 10 or less, preferably 1.5 or more, more preferably 2 or more, and also preferably 9 or less, more preferably 8 or less . The method according to any one of claims 1 to 19,
The first surface layer has a fiber of 0.2 dtex or more and 2.4 dtex or less, preferably has a fiber of 0.5 dtex or more, more preferably has a fiber of 0.8 dtex or more, and preferably has a fiber of 2 dtex or less, Non-woven fabric for absorbent article, more preferably having a fiber of 1.8 dtex or less. The method according to any one of claims 1 to 20,
The ratio of the basis weight (G1) of the first face layer to the basis weight (G2) of the second face layer (the basis weight (G1) of the first face layer/the basis weight (G2) of the second face layer) is 1.2 or more and 10 or less, Nonwoven fabric for absorbent articles, preferably 1.5 or more, more preferably 2 or more, and also preferably 8 or less, more preferably 6 or less. The method of any one of claims 10, 11 and 16,
If the fibers show the same orientation, the number of fibers crossing two sides in one direction of the square when a virtual square is arranged by observing a plane along the plane direction of the target portion of the nonwoven fabric for absorbent article (P3) ) And the ratio (number (P3)/number (P4)) of the number (P4) of fibers crossing two sides of the other direction of the square means 1.2 or more in each site to be compared, preferably A nonwoven fabric for absorbent articles of 1.5 or more, more preferably 2 or more. The method according to any one of claims 1 to 22,
The apparent thickness H1 under a load of 35 MPa is 0.5 mm or more and 5 mm or less, preferably 1 mm or more, more preferably 1.2 mm or more, and also preferably 4 mm or less, more preferably 3 mm or less, Non-woven fabric for absorbent articles. The method according to any one of claims 1 to 23,
The apparent thickness H2 under 1 MPa load is 0.2 mm or more and 3 mm or less, preferably 0.3 mm or more, more preferably 0.5 mm or more, and also preferably 2 mm or less, more preferably 1.5 mm or less, Non-woven fabric for absorbent articles. The method according to any one of claims 1 to 24,
The ratio of the apparent thickness (H2) under 1 ㎪ load to the apparent thickness (H1) under 35 ㎩ load is 10% or more and 80% or less, preferably 20% or more, more preferably 30% or more Dragon nonwoven fabric. The method according to any one of claims 1 to 25,
The ratio of the area (E2) of the laminated portion to the total area (E1) of the nonwoven fabric for absorbent articles as viewed from the plane is 10% or more and 95% or less, preferably 15% or more, and more preferably 20% The above is a nonwoven fabric for absorbent articles. The method according to any one of claims 1 to 26,
A nonwoven fabric for an absorbent article, wherein a part of the laminated portion is a five-layer portion. The method according to any one of claims 1 to 27,
In the above-mentioned laminated part, the connection part of one end of the intermediate layer between the end of the first surface layer and the first surface layer and the second surface layer, the connection part of the end of the second surface layer and the end of the first surface layer , And, the non-woven fabric for the absorbent article is disposed in one or more selected from the connecting portion of the other end of the intermediate layer and the end of the second surface layer. The method according to any one of claims 1 to 28,
In the laminated portion, a non-woven fabric for absorbent articles is provided with a space between the second face layer and the intermediate layer between the first face layer and the second face layer. An absorbent article using the nonwoven fabric for absorbent articles according to any one of claims 1 to 29. The absorbent article according to any one of claims 1 to 29, wherein the nonwoven fabric for absorbent articles has the first surface layer facing the skin surface side as a surface sheet, and has an absorbent body on the second surface side of the surface sheet. The structural member of the absorbent article is affixed to the second side of the nonwoven fabric for absorbent articles according to any one of claims 1 to 29, and less than 70% of the total surface of the second side of the nonwoven fabric for absorbent articles. An adhesive is disposed in the area, and the ratio of the area of the adhesive to the entire surface of the second side of the nonwoven fabric for absorbent article is preferably 65% or less, even more preferably 50% or less, and preferably Is 10% or more, more preferably 15% or more, still more preferably 20% or more. An absorbent article in a folded state, wherein the nonwoven fabric of the absorbent article is in a state according to any one of claims 1 to 32. An absorbent article in an absorbent article package in which a plurality of absorbent articles are stored, wherein the nonwoven fabric of the absorbent article is in a state according to any one of claims 1 to 32.

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