TW202031219A - Nonwoven fabric for absorbent article - Google Patents

Abstract

This nonwoven fabric for an absorbent article comprises thermoplastic fibers, the nonwoven fabric including a plurality of layered portions 1 in which a piece of nonwoven fabric has parts that are folded over to form three or more overlapping layers in the thickness direction, wherein in each layered portion 1, a first face layer 2 that is located on a first face side Z1 of the nonwoven fabric and a second face layer 3 that is located on a second face side Z2 are flat and the fibers of the first face layer 2 and the second face layer 3 are oriented in a planar direction.

Description

Non-woven fabrics for absorbent articles and absorbent articles

The present invention relates to a non-woven fabric for absorbent articles.

Non-woven fabrics are usually used in absorbent articles such as menstrual tampons or diapers. There are known techniques for imparting various functions to the nonwoven fabric. Among them, from the viewpoint of reducing friction on the skin, there is a nonwoven fabric in which movement is imparted to the surface of the nonwoven fabric by an uneven shape (for example, the nonwoven fabric described in Patent Documents 1 to 3). In the concavo-convex shape of the non-woven fabric, the convex part is in contact with the skin and is movable. The nonwoven fabric described in Patent Document 1 has a plurality of protrusions on both sides. The protrusions on both surfaces, that is, the first protrusion and the second protrusion protrude to the opposite side of each other, and are continuous via the annular wall. The constituent fibers of the non-woven fabric have radial fiber orientation that converges to the top of the second protrusion from the annular wall in the thickness direction. Patent Document 2 describes a front sheet provided with a plurality of ring portions protruding toward the wearer's skin side. The surface sheet has a double-layer structure in which the fiber layer constituting the ring portion is partially joined to the base layer. In this structure, between the above-mentioned joining parts, the ring part protrudes in the direction toward the wearer's skin side so that it protrudes greatly. In Patent Document 3, a non-woven fabric having a sufficiently defined three-dimensional shape even when compressed as an absorbent article is described. Specifically, the non-woven fabric has protrusions extending outward from the first surface. The protrusion has a cap part similar to the main part of a mushroom, and does not have a hinge structure like a foldable hinge. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2013-119012 [Patent Document 2] Japanese Patent Laid-Open No. 2004-121701 [Patent Document 3] Japanese Patent Publication No. 2017-528614

The invention provides a non-woven fabric with thermoplastic fibers. In the embodiment, there are a plurality of laminated portions in which a single non-woven layout portion is folded and three or more layers are overlapped in the thickness direction. In the embodiment, the first surface layer located on the first surface side of the non-woven fabric and the second surface layer located on the second surface side of the laminated portion are flat. In the embodiment, the fibers of the first surface layer and the second surface layer are aligned in a plane direction. In the embodiment, the non-woven fabric is a non-woven fabric for absorbent articles.

In the embodiment, the fibers of each layer of the non-woven fabric are provided with hot-melt parts, and the laminated part has a folding structure without intervening a joining mechanism. In the embodiment, when the non-woven fabric is viewed from above, there is a single layer part between the adjacent laminated parts. In the embodiment, the first surface layer has fibers of 2.4 dtex or less. In the embodiment, the basis weight of the first surface layer is greater than the basis weight of the second surface layer.

In the embodiment, when the non-woven fabric is viewed from above, there are a plurality of regions in which the laminated portion extends in a certain direction. In the embodiment, when the non-woven fabric is viewed from above, there is a region of a single layer portion surrounded by the layered portion. In the embodiment, the area of the single-layer portion has a curved portion on the outer edge in a plan view. 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 of the region where the laminated portion extends in one direction are displayed in the same orientation direction on at least one of the first surface side and the second surface 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 the embodiment, when the non-woven fabric is viewed from above, there is a single layer portion between the adjacent laminated portions, and there is a region where the single layer portion extends in a certain direction. In the embodiment, there is a region where the single layer portion extends in a direction orthogonal to the certain direction. In the embodiment, there is a single-layer part, and when the non-woven fabric is viewed in a plan view, there is a region of the laminated part surrounded by the single-layer part. In the embodiment, another single-layer part further exists in the area of the laminated part surrounded by the above-mentioned single-layer part. In the embodiment, the fibers of the single-layer portion extending in the above-mentioned certain direction show the same orientation direction as the fibers of the single-layer portion extending in a direction orthogonal to the above-mentioned certain direction.

In the embodiment, the first surface layer or the second surface layer being flat means that the first surface layer or the second surface layer is placed on a table on the lower side, and a transparent 35 Pa load is placed on the upper side. The ratio of the area in contact with the transparent plate when viewed from the top of the plate is a certain value or more. Optionally, the ratio of the contact area between the first surface layer or the second surface layer and the transparent plate is 50% or more and 99% or less, It is preferably 60% or more, more preferably 70% or more, and/or preferably 95% or less, and more preferably 90% or less. In the embodiment, the orientation of the fibers of the first surface layer or the second surface layer in the plane direction refers to the comparison of the number of fibers P1 and the number of fibers P2, which is the number of fibers P1>the number of fibers P2. The number of fibers P1 is the number of non-woven fabrics for absorbent articles viewed from the first side or the second side, and the number of fibers that intersect each side of the square when the imaginary square is arranged. The number of fibers P2 is observed The number of cross sections along the thickness direction of the first surface layer or the second surface layer that intersect each side of the square when a imaginary square is arranged. In the embodiment, the fibers of the first surface layer or the second surface layer are aligned in the plane direction, and the ratio P1/P2 of the number of fibers P1 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 or less, the number of fibers P1 is for viewing the absorbent article from the first surface side or the second surface side Non-woven fabric, the number of pieces that intersect each side of the square when arranging an imaginary square, the number of fibers P2 is when the imaginary square is arranged when observing the cross section of the first surface layer or the second surface layer along the thickness direction The number of bars that intersect each side of the square. In an embodiment, the first surface layer has fibers of 0.2 dtex or more and 2.4 dtex or less, preferably fibers having 0.5 dtex or more, more preferably fibers having 0.8 dtex or more, and/or preferably having 2 dtex or less The fiber is more preferably less than 1.8 dtex. 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 Below, it is preferably 1.5 or more, more preferably 2 or more, and/or preferably 8 or less, more preferably 6 or less. In the embodiment, the fibers showing the same orientation direction means that the ratio of the number of fibers P3 to the number of fibers P4 (number of fibers P3/number of fibers P4) is 1.2 or more at each position to be compared. 1.5 or more, more preferably 2 or more, the number of fibers P3 is the one that intersects the two sides in one direction of the imaginary square when observing the surface of the target part of the nonwoven fabric for absorbent articles along the plane direction. The number of fibers, the number of fibers P4 mentioned above is the number of fibers intersecting with two sides of the other direction of the square. In the embodiment, the apparent thickness H1 under a load of 35 Pa 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 3 mm below. In the embodiment, the apparent thickness H2 under a load of 1 kPa 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 1.5 mm below. In the embodiment, the ratio of the apparent thickness H2 under a load of 1 kPa to the apparent thickness H1 under a load of 35 Pa is 10% or more and 80% or less, preferably 20% or more, and more preferably 30% or more. In the embodiment, the ratio of the area E2 of the laminated part in the plan view of the nonwoven fabric for absorbent articles to the total area E1 is 10% or more and 95% or less, preferably 15% or more, and more preferably 20% or more. In the embodiment, a part of the above-mentioned laminated part is a five-layer part. In the embodiment, in the laminated portion, the connecting portion selected from the end portion of the first surface layer and the end portion of the intermediate layer between the first surface layer and the second surface layer, the second surface layer One or more of the connecting portion between the end portion and the end portion of the first surface layer and the connecting portion between the other end portion of the intermediate layer and the end portion of the second surface layer are arranged with indentations. In the embodiment, a space portion is arranged between the second surface layer and the first surface layer and the intermediate layer between the second surface layer in the layered portion.

In addition, the present invention provides an absorbent article using the aforementioned non-woven fabric and/or the aforementioned non-woven fabric for absorbent articles. In the embodiment, the non-woven fabric and/or the non-woven fabric for absorbent articles are provided as a surface sheet, and the first surface layer faces the skin surface side, and an absorber is provided on the second surface side of the surface sheet. In the embodiment, the constituent member of the absorbent article is attached to the second surface side of the nonwoven fabric and/or the nonwoven fabric for absorbent articles, optionally on the second surface side relative to the nonwoven fabric for absorbent articles. Adhesive is arranged on the entire surface area of less than 70%. Optionally, the ratio of the area of the adhesive to the entire surface of the nonwoven fabric for absorbent articles on the second surface side is preferably 65% or less, more preferably 50 % Or less, and/or preferably 10% or more, more preferably 15% or more, and still more preferably 20% or more. In the embodiment, in the absorbent article in the folded state, the non-woven fabric of the absorbent article is in the above state. In the embodiment, in an absorbent article package containing a plurality of absorbent articles, the non-woven fabric of the absorbent article is in the above state.

The above and other features and advantages of the present invention are made more clear from the following description with appropriate reference to the accompanying drawings.

The present invention relates to a non-woven fabric for absorbent articles that can simultaneously improve the smooth touch of the surface of the non-woven fabric and prevent the friction of the skin in contact with the surface of the non-woven fabric.

In the non-woven fabrics having uneven shapes described in Patent Documents 1 to 3, the convex portions (protrusions) are movable so as to follow the skin in contact with the surface of the non-woven fabric, thereby reducing skin friction. However, the contact with the skin is near the top of the convex portion (protrusion portion), and the contact area becomes smaller. Therefore, there is room for improvement from the viewpoint of the smooth touch of the surface of the non-woven fabric. On the other hand, in a non-woven fabric with a flat surface, a smooth touch can be expected. However, in this case, it does not have the mobility like the uneven shape. Therefore, from the viewpoint of reducing the friction of the skin in contact with the surface of the non-woven fabric, there is room for improvement.

The non-woven fabric for absorbent articles of the present invention can simultaneously improve the smooth touch of the surface of the non-woven fabric and prevent friction of the skin contacting the surface of the non-woven fabric.

In the present invention, the absorbent article is an article that absorbs various body fluids such as urine or menstrual blood and retains them. For example, various articles such as diapers, menstrual tampons, urine-absorbent pads, and incontinence pads can be cited. The absorbent article includes a front sheet on the skin side, a back sheet on the non-skin side, and a liquid-retaining absorber arranged between the front sheet and the back sheet. In addition to these, other components may be provided as needed. In the structure of the member of the absorbent article, the non-woven fabric for the absorbent article of the present invention is preferably used as a member located at a position in contact with the skin. For example, it is preferably used as the above-mentioned surface sheet. In addition, it is preferably used as a sheet for further covering the non-skin surface side on the back sheet.

In the present invention, unless otherwise specified, the side in contact with the human body is called the skin surface side, and the opposite side is called the non-skin surface side. These components, even if they do not have a surface in contact with the human body, are used to represent the relative positional relationship in the component composition of the absorbent article. In addition, the direction on the front side of the human body when worn is called the front, and the direction on the back side is called the back. The normal direction of the front or back of the absorbent article is called the thickness direction.

Hereinafter, a preferred embodiment of the non-woven fabric for absorbent articles of the present invention will be described with reference to the drawings.

Fig. 1 shows a cross section of a nonwoven fabric 10 for absorbent articles (hereinafter, also simply referred to as nonwoven fabric 10) according to the first embodiment. The nonwoven fabric 10 has a first surface side Z1 and a second surface side Z2 that is the opposite surface side of the first surface side. Either the first surface side Z1 and the second surface side Z2 may face the absorber side of the absorbent article. In the present embodiment, it is preferable to use a liquid-retaining absorber as a reference in an absorbent article, with the first surface side Z1 being the surface side facing the outside, and the second surface side Z2 being the direction The above-mentioned absorber is shown on the face side and used in this way. For example, when the nonwoven fabric 10 is used as a surface sheet, the first surface side Z1 becomes the surface side that abuts on the skin, and the second surface side Z2 becomes the surface side facing the absorber. In addition, when the nonwoven fabric 10 is used as a sheet that further covers the non-skin side of the back sheet, the first side Z1 becomes the outermost side of the absorbent article (the outermost non-skin side), and the second The face side Z2 becomes the face side facing the absorber.

The non-woven fabric 10 is a non-woven fabric having thermoplastic fibers. The "piece of non-woven fabric" mentioned here refers to the one obtained by fusing a fiber web containing thermoplastic fibers at the intersection of fibers (obtained by non-woven fabrics such as hot air treatment). The non-woven fabric is laminated before fusing The obtained one is defined as 1 piece of non-woven fabric. Whether it is obtained by laminating the fiber web before fusing can be judged by observing the non-woven fabric under a microscope. In the manufactured non-woven fabric, if a plurality of fibers are fused (fused across the area of the intersection of the fibers), and no thin film area is found, it can be defined as "1 piece of non-woven fabric". For example, if there is a fusion area (a fusion area spanning a plurality of fiber intersections) obtained by embossing, it is set as "one with non-woven fabric attached" instead of a piece of non-woven fabric. The one obtained by joining non-woven fabrics manufactured by thermal melting with each other by embossing treatment, or the non-woven fabric obtained by laminating another fiber web on the non-woven fabric manufactured by thermal melting and joining by embossing treatment is not a non-woven fabric. Furthermore, it is also possible to perform embossing treatment for other purposes such as joining with another sheet in the step after the fiber web is non-woven, for example, in the step of knitting the non-woven fabric into the absorbent article.

The non-woven fabric 10 has a plurality of laminated portions 1 in which one non-woven layout portion is folded and three or more layers are overlapped in the thickness direction. In this embodiment, as shown in the cross section of Fig. 1, the laminated part 1 is formed by the first surface layer 2 on the first surface side Z1, the second surface layer 3 on the second surface side Z2, and the intermediate layer 4 between the two layers. They overlap in the thickness direction to form three layers. The first surface layer 2 and the second surface layer 3 in the build-up part 1 are flat. In the present invention, the layered portion is not limited to the three layers of this embodiment, and may be four or more layers.

Here, overlapping in the thickness direction means that when an imaginary line L1 perpendicular to the thickness direction is drawn with respect to the cross-section of the layered portion 1, the first surface layer 2, the intermediate layer 4, and the second surface layer 3 are all arranged to form the imaginary line L1 The state of penetration. 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 are completely overlapped, but also includes the case of partial overlap.

In addition, that the first surface layer 2 and the second surface layer 3 are flat means that the first surface layer 2 or the second surface layer 3 is placed on the horizontal table T, and a load of 35 Pa is placed on the upper side. When the transparent board is viewed from the top, the ratio of the contact area with the transparent board is more than a certain amount. When measuring, prepare a non-woven fabric of 5 cm×5 cm or more. From the viewpoint of smooth touch, the ratio of the contact area between the first surface layer 2 or the second surface layer 3 and the transparent plate is preferably 50% or more, more preferably 60% or more, and even more preferably 70% or more . Moreover, from the viewpoint of not hindering activities, it is preferably 99% or less, more preferably 95% or less, and still more preferably 90% or less. Specifically, from the viewpoint of smoothness, the contact ratio of the first surface layer 2 or the second surface layer 3 with the above-mentioned transparent board is preferably 50% or more and 99% or less, and more preferably 60% or more and 95% or less , More preferably 70% or more and 90% or less.

In the non-woven fabric 10, the respective fibers of the first surface layer 2 and the second surface layer 3 are aligned in the plane direction. By aligning the fibers in the planar direction in the flat first surface layer 2 and the second surface layer 3, a smooth touch feeling along the alignment direction is obtained. At the same time, the non-woven fabric 10 has a flat surface, and the laminated portion 1 is provided with a movable region 5 in which the first surface layer 2 and the second surface layer 3 can move in opposite directions with the intermediate layer 4 as an axis. Due to the action of the movable area 5, the non-woven fabric 10 has an improved followability to the movement of the skin, and the performance of preventing the friction of the skin in contact with the surface of the non-woven fabric is higher. As a result, the non-woven fabric 10 simultaneously improves the smooth touch of the surface of the non-woven fabric and the performance of preventing the friction of the skin in contact with the surface of the non-woven fabric.

Here, the orientation of the fibers of the first surface layer 2 and the second surface layer 3 in the plane direction refers to comparing the number of fibers P1 with the number of fibers P2, and the number of fibers is P1>the number of fibers P2. The number P1 is the number of the nonwoven fabric 10 viewed from the first surface side Z1 or the second surface side Z2, and the number of lines intersecting each side of the square when the imaginary square is arranged. The cross section of the two-sided layer 3 along the thickness direction is the number of pieces that intersect each side of the square when the imaginary square is arranged.

The number of fibers P1 and P2 are specifically measured by the following method. Furthermore, when the non-woven fabric is incorporated as a component of the absorbent article, the adhesive used for the absorbent article is cured by a cooling method such as cold spray, and the non-woven fabric to be measured is carefully peeled off and measured. At this time, the adhesive is removed using an organic solvent. This treatment is also performed in the other measurement methods in this specification.

(Method for measuring the number of fibers P1 and P2) (i) Cut the non-woven fabric to be measured into a square of 2 cm×2 cm as a sample, and observe the non-woven fabric from the first side Z1 or the second side Z2. For observation, for example, it is preferable to use a scanning electron microscope (SEM). For the SEM, for example, JCM-6100Plus (manufactured by JEOL Ltd.) is used. In the SEM observation, it is preferable to vapor-deposit the sample using the recommended method in advance. (ii) Then, magnify the center of the surface of the first surface layer 2 or the second surface layer 3 at a magnification of 50 times for the SEM image, and display it in the center of the observation screen. Draw an imaginary square with the center of the screen as the intersection of the diagonals and one side of 500 μm, and count the number of fibers P1 that intersect each side of the square. (iii) Similarly, for the cross section of the first surface layer 2 or the second surface layer 3 along the thickness direction, draw an imaginary square with one side of 500 μm, and count the number of fibers that intersect each side of the square P2. (iv) Measure the number of the non-woven fabrics at any three places of the measurement object and find the average value. The average values were used as the number of fibers P1 and P2 of the nonwoven fabric to be measured. At this time, the angle of each side of the square relative to the non-woven fabric is unchanged at any three places. That is, the side of the square of P1 at the first measurement point and the side of the square of P1 at the second measurement must be parallel. Also, regarding P1, the number of fibers in the first place is more than P2 as P1.

From the viewpoint of further improving the smooth touch of the surface of the nonwoven fabric 10, 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, more preferably 1.5 Above, more preferably 2 or more. Furthermore, from the viewpoint of the strength balance of the nonwoven fabric, the ratio P1/P2 is preferably 10 or less, more preferably 9 or less, and still more preferably 8 or less. 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 still more preferably 2 or more and 8 or less.

The non-woven fabric 10 preferably has a heat-melting portion between the fibers of each layer (each layer of the laminated portion 1), and has a folded structure without intervening a joining mechanism. This structure is preferably arranged on the first surface layer 2 and the second surface layer 3 of the build-up portion 1, and more preferably arranged on the intermediate layer 4 in addition to these. Each layer is kept in shape by heat fusion, and each layer is folded without intervening a joining mechanism, whereby the first surface layer 2 and the second surface layer 3 can smoothly move in opposite directions with the intermediate layer 4 as the axial direction.

In the nonwoven fabric 10, the laminated part 1 which becomes the movable area 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 surface layer 3. One end 4A and the other end 4B of the intermediate layer 4 do not overlap in the thickness direction. Thereby, the first surface layer 2, the intermediate layer 4, and the second surface layer 3 overlap in the thickness direction. The connecting part of the first surface layer 2, the middle layer 4 and the second surface layer 3 is the folding starting point (folding line portion). In addition, the laminated portion 1 is folded in a zigzag shape when viewed in cross section without intervening the connecting mechanism. Thereby, the first surface layer 2 and the second surface layer 3 connected to the both ends 4A, 4B of the intermediate layer 4 move by pressing the intermediate layer 4 as an axis in opposite directions, and the laminated portion 1 is movable. At this time, the laminated portion 1 is movable along the plane direction where the connecting portion between the first surface layer 2 and the intermediate layer 4 and the connecting portion between the intermediate layer 4 and the second surface layer 3 are arranged side by side before being moved. For example, when the non-woven fabric 10 is used as a surface sheet of an absorbent article, the second surface layer 3 of the non-woven fabric 10 is fixed to the absorber, and the first surface layer 2 abuts against the skin. For the first surface layer 2, a shear force in the plane direction is applied by the contacting skin. At this time, the build-up part 1 functions as follows. That is, the first surface layer 2 intends to move following the skin, and pulls one end 4A of the middle layer 4. Furthermore, the one end 4A moves 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 moves in the plane direction following the skin. Therefore, even if the first surface layer 2 is provided with a flat surface layer 2, it can also exhibit an action function like a concave-convex shape.

From the viewpoint of making the laminated portion 1 a structure overlapping in the thickness direction, in the cross section of the laminated portion 1, the angle θ1 formed by the intermediate layer 4 and the first surface layer 2 and the intermediate layer 4 and the second surface layer The angle θ2 formed by 2 is preferably an acute angle. Specifically, the angle θ1 and the angle θ2 are preferably 30° or less, more preferably 20° or less, and still more preferably 10° or less, and the smaller the better. However, it is actually 1° or more. By setting the angles θ1 and θ2 in the above range, a smooth touch feeling on the surface of the non-woven fabric can be achieved, and the above-mentioned mobility in the plane direction can be better exhibited.

In the non-woven fabric 10, from the viewpoint of further improving the above-mentioned mobility, it is preferable to connect the end portion 2A selected from the first surface layer 2 and one end portion 4A of the intermediate layer 4 as shown in FIG. 2(B) 1 of the connecting portion between the end 3A of the second surface layer 3 and the end 2A of the first surface layer 2, and the connecting portion between the other end 4B of the intermediate layer 4 and the end 3A of the second surface layer 3 One or more retractable portions 6 having hinges that can become movable regions 5. In addition, from the same viewpoint, it is preferable to arrange a strip-shaped space portion 13 connected to the opening portion 12 of the first surface side Z1 between the intermediate layer 4 and the second surface layer 3.

In the non-woven fabric 10, the folding direction of the laminated portion 1 may be the same as shown in FIG. 1, or different for each laminated portion 1. In addition, the size in the plane direction of the layered portion 1 may be the same or different.

Furthermore, the size of the opening 12 on the first surface side Z1 may be the same, or may be different for each layered portion 1. However, from the viewpoint of improving the smooth touch of the first surface side Z1, it is preferable that the area ratio of the opening portion 12 in the entire area of the first surface side Z1 of the non-woven fabric 10 is as small as possible. Specifically, the area ratio of the opening 12 in the entire area of the first surface side Z1 of the non-woven fabric 10 is preferably 3% or more and 30% or less, more preferably 5% or more, and still more preferably 20 %the following.

Preferably, when the non-woven fabric 10 is viewed from above, a single layer portion 7 is arranged between adjacent laminated portions 1 as shown in FIG. 3. By interposing the single-layer part 7, the plural laminated parts 1 are arranged separately. Moreover, the plurality of layered parts 1 can be movable independently of the plane direction, and the performance of preventing skin friction can be further improved. In addition, the room for overlapping and spreading of the build-up section 1 is increased from the single-layer section 7 as a starting point. That is, the movable range of the movable region 5 can be expanded.

The single layer portion 7 can also be arranged on either the first surface side Z1 and the second surface side Z2, but from the viewpoint of improving the smooth touch of the first surface side Z1, it is preferably arranged on the first surface Side Z1.

In the non-woven fabric 10, from the viewpoint of achieving a smoother touch, it is preferable that the first surface layer 2 has fibers of 2.4 dtex or less, more preferably has fibers of 2 dtex or less, and more preferably has fibers of 1.8 dtex or less The fiber. Furthermore, from the viewpoint of the production of fibers or nonwoven fabrics, the first surface layer 2 preferably has fibers of 0.2 dtex or more, more preferably has fibers of 0.5 dtex or more, and more preferably has fibers of 0.8 dtex or more. Specifically, it is preferable that the first surface layer 2 has fibers having 0.2 dtex or more and 2.4 dtex or less, more preferably having 0.5 dtex or more and 2 dtex or less, and still more preferably having 0.8 dtex or more and 1.8 dtex or less.

Moreover, in the non-woven fabric 10, it is preferable that the basis weight G1 of the first surface layer 2 is greater than the basis weight G2 of the second surface layer 3 from the viewpoint of achieving a smoother touch. Also, from the same point of view, 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 of the first surface layer G1/the basis weight G2 of the second surface layer) is more Preferably it is 1.2 or more, more preferably 1.5 or more, and still more preferably 2 or more. In addition, from the viewpoint of maintaining the strength of the nonwoven fabric on the second surface side Z2, the above-mentioned ratio (basis weight G1 of the first surface layer / basis weight G2 of the second surface layer) is preferably 10 or less, more preferably 8 or less, More preferably, it is 6 or less. Specifically, the above-mentioned ratio (basis weight G1 of the first surface layer / 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 still more preferably 2 or more and 6 or less.

In addition to this, the nonwoven fabric 10 is preferably as shown in FIG. 3, and has the following structure in a plan view.

That is, it is preferable that there are a plurality of regions 14 in which the laminated portion 1 extends in a certain direction when the non-woven fabric 10 is viewed from above. In FIG. 3, the area 14 where the layered portion 1 extends faces the length direction Y of the non-woven fabric 10, and is spaced apart from each other in the width direction X and arranged in parallel. The extending direction is not limited to the longitudinal direction Y shown in FIG. 3, and may be the width direction X orthogonal to the longitudinal direction Y, or may be various directions intersecting these. Furthermore, the length direction Y and the width direction X of the nonwoven fabric 10 are the machine direction (MD) direction and the width direction (Cross Direction; CD) orthogonal to the machine direction (MD) during manufacture. In this way, by the existence of a plurality of regions 14 extending from the layered portion 1, the layered portion 1 is uniformly arranged, and a smooth touch without unevenness can be obtained more easily.

Furthermore, in the laminated portion 1 of the non-woven fabric 10 shown in FIG. 3, the connecting portion between the first surface layer 2 and the intermediate layer 4, and the connecting portion between the intermediate layer 4 and the second surface layer 3 shown in FIG. They are arranged side by side in direction X. Therefore, the laminated portion 1 is movable in the width direction X. Thus, from the viewpoint of both a smooth touch and the ability to prevent skin friction, it is preferable that the direction in which the layered portion 1 extends (the length direction Y in FIG. 3) and the direction in which the layered portion 1 is movable (The X direction in Fig. 3) is different.

Moreover, it is preferable that the area 15 of the single layer part 7 surrounded by the laminated part 1 exists when the nonwoven fabric 10 is planarly viewed. Since the single layer part 7 is surrounded by the layer part 1, it is easy to produce the action of the layer part 1 starting from the single layer part 7. In addition, the multiple layered parts 1 surrounding the single layered part 7 are independently movable, and can be linked to follow the skin. Thereby, the performance of preventing the friction of the skin in contact with the surface of the non-woven fabric is further improved.

In addition, it is preferable that the area 15 of the single-layer portion 7 surrounded by the laminated portion 1 has a curved portion 15A on its outer edge in a plan view. In FIG. 3, the curved portion 15A has a planar shape curved into a U-shape. However, the curved portion 15A is not limited to the shape shown in FIG. 3, and can take various curved shapes. Since the area 15 of the single-layer part 7 has the curved part 15A, the movement of the laminated part 1 is smoother, and the friction of the skin can be further suppressed.

Furthermore, it is preferable that the boundary between the single-layer portion 7 and the laminated portion 1 in the curved portion 15A is arranged on the second surface side Z2 of the non-woven fabric 10. Thereby, the step difference between the single layer portion 7 and the laminated portion 1 in the curved portion 15A is arranged on the second surface side Z2 of the non-woven fabric 10, and the smooth touch of the first surface side Z1 can be maintained.

Furthermore, the regions 14 extending in a certain direction of the layered portion 1 may all have the same width or different widths. In addition to this, different from the region 15 of the single layer portion 7, another single layer portion (not shown) along the extending direction of the region 14 may be further present in the above-mentioned region 14.

Preferably, the fibers of the region 14 extending in one direction of the laminated portion 1 show the same alignment direction on at least any one of the first surface side Z1 and the second surface side Z2 of the nonwoven fabric 10. The laminated part 1 constituting the movable region 5 shows a fixed alignment direction, and a smoother touch is obtained. From this viewpoint, it is preferable that the fibers of the first surface layer 2 in the laminated portion 1 show the same alignment direction in each region 14 where the laminated portion 1 extends. It is particularly preferable that the orientation direction of the fibers of the first surface layer 2 is a direction (the length direction Y in FIG. 3) orthogonal to the movable direction of the laminated portion 1 (the width direction X in FIG. 3). In addition, it is preferable that the fibers of the second surface layer 3 and the intermediate layer 4 in the laminated portion 1 show the same alignment direction in each region 14 where the laminated portion 1 extends. From the viewpoint of improving the mobility of the laminated portion 1, it is particularly preferable that the orientation direction of the fibers of the second surface layer 3 and the intermediate layer 4 is a direction orthogonal to the orientation direction of the fibers of the first surface layer 2, that is, the laminated portion 1 Movable direction.

Furthermore, 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 show the same orientation direction. Thereby, a smoother touch is obtained on the first side Z1 of the non-woven fabric 10.

As mentioned above, fibers showing the same orientation direction means that the ratio of the number of fibers P3 to the number of fibers P4 (number of fibers P3/number of fibers P4) is 1.2 or more at each position to be compared. The number of fibers described above is P3 Observe the surface along the plane direction of the target part of the non-woven fabric 10, and arrange the imaginary square when it intersects the two sides in one direction of the square. The number of fibers P4 mentioned above is the two sides in the other direction of the square The number of intersections. The above-mentioned ratio is preferably 1.5 or more for each part to be compared, and more preferably 2 or more. At this time, when measuring between the observed parts, do not change the angle of each side of the square relative to the non-woven fabric. That is, the side of the square of P3 at the beginning of the measurement must be parallel to the side of the square of P3 at the other part of the next observation. Regarding P3, the number of fibers at the beginning is more than P4 as P3.

The number of fibers P3 and P4 can be measured in accordance with the above (Method for Measuring the Number of Fibers P1 and P2). Furthermore, the observation surface of the target part may be any one of the first surface side Z1 and the second surface side Z2 of the target part.

Next, the non-woven fabric 20 for absorbent articles (hereinafter, abbreviated as the non-woven fabric 20 in some cases) of the second embodiment will be described. Hereinafter, regarding the nonwoven fabric 20 for absorbent articles of the second embodiment, differences from the nonwoven fabric 10 for absorbent articles of the first embodiment will be described. In the nonwoven fabric 20 for absorbent articles of the second embodiment, the parts and the like that are common to the nonwoven fabric 10 for absorbent articles of the first embodiment are denoted by the same reference numerals.

4 and 5 show the nonwoven fabric 20 of the second embodiment. The difference between the nonwoven fabric 20 of the second embodiment and the nonwoven fabric 10 of the first embodiment lies in the arrangement of the laminated portion 1 in the plane direction. Regarding other matters, the nonwoven fabric 20 of the second embodiment has a plurality of laminated portions 1 like the nonwoven fabric 10 of the first embodiment, and the first surface layer 2 and the second surface layer 3 are flat and two-layer fibers. For the alignment in the plane direction, various preferable aspects shown in the non-woven fabric 10 of the first embodiment can be suitably applied.

In the non-woven fabric 20, as shown in the cross-sectional view of FIG. 4, a single layer portion 7 is arranged between adjacent laminated portions 1. The nonwoven fabric 20 has a single layer portion 71 on the first side Z1 (hereinafter, also referred to as a front single layer portion 71) and a single layer portion 72 on the second side Z2 (hereinafter, also referred to as a back single layer portion 72) as single Layer part 7. The front single layer portion 71 is continuous with the first surface layer 2 of the build-up portion 1 and constitutes a flat surface on the first surface side Z1 of the nonwoven fabric 20. The back single layer portion 72 is continuous with the second surface layer 3 of the build-up portion 1 and constitutes a flat surface on the second surface side Z2 of the nonwoven fabric 20.

In the non-woven fabric 20, it is preferable that there is a region 21 in which the single layer portion 7 extends in a certain direction as shown in the plan view of FIG. More preferably, there is a region 22 in which the single-layer portion 7 extends in a direction orthogonal to the above-mentioned one direction. As the single-layer portion 7 constituting the regions 21 and 22, a front single-layer portion 71 can be cited. As a certain direction mentioned above and a direction orthogonal to this one direction, the longitudinal direction Y and the width direction X are shown in FIG. But it is not limited to these directions, including various directions on the plane of the non-woven fabric 20. In the non-woven fabric 20, by having at least any one of the area 21 and the area 22 where the front single-layer portion 71 extends, the front single-layer portion 7 is uniformly arranged, and a smooth touch without unevenness can be obtained more easily.

Moreover, it is preferable that the area 23 of the laminated part 1 surrounded by the single-layer part 7 exists when the nonwoven fabric 20 is planarly viewed. As this aspect, the area 23 where the build-up part 1 exists in the part surrounded by the area 21 extended by the front single-layer part 71 and the area 22 is mentioned. In this aspect, the area 23 of the build-up portion 1 is spaced at regular intervals in a grid formed by the area 21 and the area 22 extending from the front single-layer portion 71 at regular intervals. It happens to be a structure in which the laminated part 1 supports the entire plane of the non-woven fabric 20 like road bricks. In addition, the layered portion 1 constitutes the movable region 5 in the same manner as in the first embodiment described above. Thereby, the plane of the non-woven fabric 20 can be softly followed in all directions in accordance with the movement of the skin, and the performance of preventing skin friction can be further improved. In addition, the plurality of laminated parts 1 have a thickness relative to the entire plane of the non-woven fabric 20, and act like a soft spring to impart cushioning properties.

In addition, it is preferable that a region 24 of another single-layer part 7 is further present in the region 23 of the build-up part 1. As the single-layer portion 7 constituting the region 24, a back single-layer portion 72 can be cited. The multiple layered parts 1 that perform the above-mentioned functions can easily move in any direction of 360° from the area 24 of the single layered part 7 to further improve the performance of preventing skin friction.

More preferably, when the nonwoven fabric 20 is viewed from above, the fibers of the single-layer portion 7 extending in a certain direction and the fibers of the single-layer portion 7 extending in a direction orthogonal to the above-mentioned certain direction show the same orientation direction. Specifically, it is preferable that the fibers in the region 21 extending in the length direction Y of the front single layer portion 71 and the fibers in the region 22 extending in the width direction X of the front single layer portion 71 show the same alignment direction. Thereby, the first side Z1 of the non-woven fabric 20 presents a smoother touch. In addition, the fact that the fibers described here have the same orientation direction has the same meaning as that of the definition described for the nonwoven fabric 10 of the first embodiment. The number of fibers P3 and P4 are also measured by the same method as above. In the second embodiment, the preferred range shown in the first embodiment can also be applied.

As described above, the nonwoven fabric 10 for absorbent articles of the first embodiment and the nonwoven fabric 20 for absorbent articles of the second embodiment can be appropriately combined within a range that does not conflict with each other. For example, in the nonwoven fabric 20 for absorbent articles of the second embodiment, as the plane arrangement of the laminated portion 1 shown in the cross-sectional view of FIG. 4, the laminated portion 1 of the first embodiment extends in one direction of the nonwoven fabric plane. The area is arranged adjacent to the area 21 or the area 22 where the single layer portion 7 extends (not shown).

In addition, 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, there may be a two-layer part of the intermediate layer 4 and the second surface layer 3 of the layered part 1 being layered on another layered part 1 adjacent thereto to form a five-layer part (not shown). Thereby, the thickness increases and the cushioning property is improved, and the soft skin touch can be improved.

The nonwoven fabric 10 for absorbent articles of the first embodiment and the nonwoven fabric 20 for absorbent articles of the second embodiment can be manufactured by the method shown in FIG. 6 or the like. In FIG. 6, the support male material 120 and the support base material 130 used to shape the fiber web 110 before non-woven fabric are used. The non-woven fabric precursor obtained by shaping is compressed in the thickness direction to manufacture. When compressing in the thickness direction, it is preferably performed simultaneously with the application of temperature.

First, as shown in FIG. 6(A), the fiber web 110 is placed on the support male material 120, and the fiber web 110 is pressed and clamped by the support base material 130 to shape it. .

The support body 120 has a plurality of protrusions 121 vertically erected on the substrate. Between the protrusions 121 and 121 is a recess 122, and the recess 122 is arranged in a lattice shape.

The support base material 130 has protrusions 131 corresponding to the recesses 122 of the support male material 120. Between the protrusions 131 and 131 is a recess 132 corresponding to the protrusion 121 of the supporting body male material 120. In the first embodiment, the protrusions 131 and the recesses 132 have shapes that are continuous in one direction when viewed from above, and the protrusions 131 and the support recesses 132 are alternately arranged in a direction orthogonal to the one direction. Specifically, there can be mentioned those in the shape of a drum in which a plurality of annular disks are connected at equal intervals in the direction of the rotation axis. In the second embodiment, the protrusions 131 have a lattice shape, and the recesses 132 are arranged inside the lattice shape. In the support base material 130, the distance between the protrusions 131 and 131 is greater than the width of the protrusion 121 of the support male material 120. The distance is appropriately set in such a way that the fiber web 110 can be sandwiched by the protrusions 121 of the support male material 120 and the protrusions 131 of the support base material 130, and the fiber web 110 is preferably aligned with the fiber in the thickness direction. 3 shaping.

Using the above-mentioned support body public material 120 and support body base material 130, the blowing process of hot air W1 as shown in FIG. 6(B) is arbitrarily performed. Then, the support base material 130 is removed, and hot air W2 as shown in FIG. 6(C) is blown to fuse the fibers to form a non-woven fabric. Finally, by compressing the entire plane of the obtained nonwoven fabric precursor in the thickness direction, the nonwoven fabric 10 for absorbent articles of the first embodiment and the nonwoven fabric 20 for absorbent articles of the second embodiment can be manufactured. In addition, regarding the hot air W1 and the hot air W2, both are not always necessary, and the step of blowing 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 against a calender roll, a method of tightly winding by applying tension, or a method of compressing the finished non-woven fabric by applying a load. When compressing in the thickness direction, it is preferably performed simultaneously with the application of temperature. When the temperature is set to 30°C or higher, it is easy to collapse, and the target shape can be easily formed.

The nonwoven fabric for absorbent articles of this invention is not limited to the nonwoven fabric 10 for absorbent articles of the said 1st Embodiment, and the nonwoven fabric 20 for absorbent articles of 2nd Embodiment. The non-woven fabric for absorbent articles of the present invention includes the following various forms, namely, it is a non-woven fabric with thermoplastic fibers, has a laminated portion 1, the first surface layer 2 and the second surface layer 3 are flat and the two layers of fibers are in the plane direction Alignment.

In the non-woven fabric for absorbent articles of the present invention, from the viewpoint of generating movement, the apparent thickness H1 under a load of 35 Pa (substantially no load) is preferably 0.5 mm or more, more preferably 1 mm or more, and more preferably It is 1.2 mm or more. In addition, from the viewpoint of surface smoothness, the apparent thickness H1 under a load of 35 Pa is preferably 5 mm or less, more preferably 4 mm or less, and still more preferably 3 mm or less. Specifically, the apparent thickness H1 under a load of 35 Pa is preferably 0.5 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less, and still more preferably 1.2 mm or more and 3 mm or less.

Furthermore, the "apparent thickness" in the present invention refers to the thickness between the imaginary planes in contact with the outermost part of the front and back surfaces in the entire non-woven fabric for absorbent articles.

Furthermore, in the nonwoven fabric for absorbent articles of the present invention, from the viewpoint of movement, the apparent thickness H2 under a load of 1 kPa (high load) is preferably 0.2 mm or more, more preferably 0.3 mm or more, and more Preferably, it is 0.5 mm or more. Furthermore, from the viewpoint of surface smoothness, the apparent thickness H2 under a load of 1 kPa is preferably 3 mm or less, more preferably 2 mm or less, and still more preferably 1.5 mm or less. Specifically, the apparent thickness H2 under a load of 1 kPa 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 still more preferably 0.5 mm or more and 1.5 mm or less.

Furthermore, in the nonwoven fabric for absorbent articles of the present invention, from the viewpoint of surface smoothness, the apparent thickness H2 under a load of 1 kPa (high load) is relative to the apparent thickness H2 under a load of 35 Pa (substantially no load) The ratio of thickness H1 (H2/H1) is preferably 10% or more, more preferably 20% or more, and still more preferably 30% or more. The larger the ratio, the better, but it is actually less than 80%.

(Method for measuring the apparent thickness of non-woven fabric for absorbent articles of the present invention) Cut the non-woven fabric to be measured into 10 cm×10 cm. When not using 10 cm×10 cm, try to cut into a larger area. A laser thickness meter (ZSLD80 manufactured by OMRON Co., Ltd.) was used to measure the thickness under the above load. The measurement was performed at three locations, and the average value was taken as the apparent thickness of the non-woven fabric 10.

In addition, from the viewpoint of enhancing the effect of the movable region 5, the ratio (E2/E1) of the area E2 of the laminated portion 1 in a plan view of the nonwoven fabric for absorbent articles of the present invention to the total area E1 (E2/E1) is preferably 10% or more , More preferably 15% or more, still more preferably 20% or more. From the point of view of activities, the bigger the better, but it is actually less than 95%.

The non-woven fabric for absorbent articles of the present invention exerts smooth touch and prevents skin friction, and can be combined into various constituent members of absorbent articles. For example, the absorbent article can be exemplified by menstrual sanitary napkins, sanitary pads, disposable diapers, incontinence pads, and other articles used to absorb liquid discharged from the body. The nonwoven fabric for absorbent articles of the present invention is suitable for use as a front sheet, a second sheet (a sheet arranged between the front sheet and the absorbent body), an absorbent sheet, and a covering sheet for wrapping the absorbent body in absorbent articles Materials, leak-proof sheets, etc.

Among them, it is preferable to prepare an absorbent article in which the nonwoven fabric for absorbent articles of the present invention is arranged as a surface sheet and the first surface side faces the skin surface side. It is preferable to arrange the absorber on the second surface side of the top sheet.

In addition, it is preferable to stick the constituent member of the absorbent article on the second surface side of the nonwoven fabric for absorbent articles of the present invention, which is less than the entire surface of the second surface side of the nonwoven fabric for absorbent articles of the present invention. 70% of the area is equipped with adhesive. Thereby, the smooth touch of the first surface side of the nonwoven fabric for absorbent articles of the present invention and the action of the laminated part 1 can be exerted to a large extent. From this point of view, the ratio of the area of the adhesive to the entire surface of the nonwoven fabric for absorbent articles of the present invention on the second surface side is more preferably 65% or less, and more preferably 50% or less. In addition, from the viewpoint of ensuring the stability of the display laminate portion 1 when it is movable, the ratio of the area of the adhesive to the entire surface of the non-woven fabric for absorbent articles of the present invention on the second surface side is preferably 10% or more. It is more preferably 15% or more, and still more preferably 20% or more. Specifically, the ratio of the area of the adhesive to the entire second surface side of the nonwoven fabric for absorbent articles of the present invention is preferably 10% or more and less than 70%, more preferably 15% or more and 65% or less, More preferably, it is 20% or more and 50% or less.

Absorbent articles for absorbing liquid discharged from the body typically include a front sheet, a back sheet, and a liquid-retaining absorber interposed between the two sheets. As the absorbent body and the back sheet when the nonwoven fabric for absorbent articles of the present invention is used as a front sheet, materials generally used in this technical field can be used without particular limitation. For example, the absorbent body includes an absorbent core, and optionally includes a covering sheet wrapping the absorbent core. The absorbent core can be exemplified by those holding fiber aggregates containing fibrous materials such as pulp fibers, or aggregates of absorbent polymers, or mixtures thereof. As the covering sheet, toilet paper or non-woven fabric can be used. As the back sheet, a thermoplastic resin film, or a laminate of this film and a non-woven fabric, which is impervious to liquid or water-repellent, can be used. The back sheet may also have water vapor permeability. The absorbent article may further include various members corresponding to the specific use of the absorbent article. For example, when the absorbent article is applied to disposable diapers or menstrual sanitary napkins, one or more pairs of three-dimensional protections can be arranged on the left and right sides of the front sheet.

The absorbent article having the nonwoven fabric for absorbent articles of the present invention as a constituent member is circulated in the market in a folded state. At this time, it becomes an absorbent article package housed in a packaging bag. As the absorbent article packaging body, for example, a plurality of absorbent articles in a folded state are stacked and stored in one packaging bag. In addition, as the above-mentioned absorbent article packaging, there may be an absorbent article packaging in which the absorbent articles in a folded state are housed one by one in a single packaging bag to form a single package, and a plurality of individual packages are further stored in 1 packaging bag. In the absorbent article in the folded state, it is preferable that the nonwoven fabric of the absorbent article is in the state shown as the nonwoven fabric for absorbent articles of the present invention. Moreover, it is preferable that the nonwoven fabric of the said absorbent article is shown as the nonwoven fabric for absorbent articles of this invention in the absorbent article packaging body which accommodates a plurality of absorbent articles. [Example]

Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limited to these examples for interpretation. In addition, in this embodiment, "parts" and "%" are all quality standards unless otherwise specified. In addition, the presence or absence of the plane orientation of the fibers is confirmed based on the above (Method for Measuring the Number of Fibers P1 and P2).

(Example 1) Using the thermoplastic fiber of the fiber diameter shown in Table 1, the nonwoven fabric precursor corresponding to the nonwoven fabric for absorbent articles of the first embodiment was produced by the manufacturing method shown in FIG. 6. Then, make the non-woven fabric precursor a size of 15 cm×15 cm, place it on a flat table, and place an acrylic resin board with a larger area than the non-woven fabric precursor, and place 20 kg on the acrylic resin board The plumb. In this state, it was allowed to stand at 50°C for 1 week to prepare a nonwoven fabric sample 1 for absorbent articles corresponding to the first embodiment. The obtained non-woven fabric sample 1 for absorbent articles has a laminated part, and the basis weight of the first surface layer and the second surface layer of the laminated part and the fiber orientation are as shown in Table 1.

(Example 2) The non-woven fabric precursor corresponding to the non-woven fabric for absorbent articles of the second embodiment was produced by the manufacturing method shown in FIG. 6, except that the absorbent corresponding to the second embodiment was produced in the same manner as in Example 1. Non-woven fabric sample 2 for sexual articles. The basis weights of the first surface layer and the second surface layer of the obtained nonwoven fabric sample 2 for absorbent articles and the presence or absence of fiber orientation are shown in Table 1.

(Comparative example 1) For the uneven nonwoven fabric of the shape shown in Fig. 1 of the above-mentioned Patent Document 2, the thermoplastic fiber with the fiber diameter shown in Table 1 was used, and it was produced by the hot air production method including the production steps described in the paragraph [0031] of the specification of the document. Non-woven fabric sample C1. The blowing process with the first hot air W1 is performed under the conditions of a temperature of 160°C, a wind speed of 54 m/s, and a blowing time of 3 s. The blowing process using the second hot air is performed under the conditions of a temperature of 160°C, a wind speed of 6 m/s, and a blowing time of 3 s. Table 1 shows the basis weight of the top of the first protrusion on the first surface side and the top of the second protrusion on the second surface of the obtained nonwoven fabric sample C1, and the presence or absence of fiber orientation.

(Comparative example 2) The surface material of Miaoershu Diaper M (Kao Co., Ltd., 2018, made in Japan) was peeled off by blowing a cold spray to prepare a non-woven fabric sample C2. The basis weight of the first surface layer and the second surface layer of the obtained non-woven fabric sample C2 and the presence or absence of fiber orientation are shown in Table 1.

(Comparative example 3) Using thermoplastic fibers with the fiber diameters shown in Table 1, a non-woven fabric was produced by the hot-air production method, and a flat non-woven fabric sample C3 was produced without unevenness. The basis weights of the first surface side and the second surface side of the non-woven fabric sample C3 and the plane orientation of the fibers are shown in Table 1.

The following tests (1) and (2) were performed on the above-mentioned examples and comparative examples.

(1) Smoothness test The smooth and slippery skin touch is evaluated as the friction coefficient. Using the surface testing machine KES-FB4 (trade name, manufactured by KATOTECH Co., Ltd.), the surface roughness of the non-woven fabric sample for absorbent articles was measured on the skin side under the conditions of SENS: 2×5 and a load of 4.9 kPa/m ² SMD value, average friction coefficient MIU value, standard deviation MMD value of friction coefficient. The surface roughness SMD value indicates that the smaller the value, the smoother the surface. The average friction coefficient MIU value indicates the non-slidability of the surface, and the smaller the value, the easier the sliding. The standard deviation of the coefficient of friction MMD value represents the deviation of friction. The smaller the value, the smaller the roughness of the surface and the smoother it is. In particular, it is believed that the effect of smoothness depends on the unevenness felt by the fingers. Therefore, the smaller the SMD, the smoother it feels. (2) The movement of the first surface layer The movement of the first surface layer is measured by cutting the non-woven fabric into 5 cm×5 cm. Set the double-sided tape (NICE TACK NWBB-15 manufactured by Miqibang Co., Ltd.) on the platform without gaps to 5 cm×5 cm. Place the cut non-woven fabric on it and place it so that the second side of the non-woven fabric is in contact with the double-sided tape. Furthermore, a 5 cm×5 cm acrylic resin plate was superimposed on the surface of the non-woven fabric. The above-mentioned double-sided tape is placed on the acrylic resin board without gaps, and the acrylic resin board is placed so that the first side of the nonwoven fabric is in contact with the double-sided tape. The double-sided tape and the non-woven fabric were bonded by applying a load of 3 kPa from the acrylic resin board. In this state, move the acrylic resin board to the left and right, and measure the length after the movement. At this time, if there is an intermediate layer of non-woven fabric, activity occurs. Move up, down, left and right, and measure the maximum length of the activity.

[Table 1] Table 1 Example 1 Example 2 Comparative example 1 Comparative example 2 Comparative example 3 The presence or absence of layered parts Have Have no no no The first surface layer and the second surface layer in the build-up part flat flat no no no Plane alignment Have Have no Have Have Fiber diameter (dtex) 1.8 1.8 1.8 2.3 1.8 Basis weight (first surface side/second surface side) * ^{1 )} (g/m ² ) 18/12 24/6 30/30 36 (all the same) 30 (all the same) KES smoothness: surface roughness SMD value 1.965 2.370 2.500 5.090 2.185 KES smoothness: average friction coefficient MIU value 0.216 0.249 0.227 0.251 0.201 KES smoothness: standard deviation MMD value of friction coefficient 0.0082 0.0089 0.0082 0.0106 0.0066 Surface movement (mm) 3.0 3.5 1.1 0.9 0.3 ^{* 1) The} creasing marks (first surface side/second surface side ⁾ in Examples 1 and 2 indicate the basis weight of the first surface layer/second surface layer in the laminated part.

According to Table 1, in Examples 1 and 2, the presence of the intermediate layer will cause movement, and the flat surface maintains smoothness.

Although the present invention has been described in conjunction with the embodiments and examples of the present invention, unless otherwise specified, we do not intend to limit our invention to any details, and we believe that it does not deviate from the spirit and scope of the invention shown in the scope of the attached patent application. In case, it should be explained broadly.

This case claims the priority based on the international PCT/JP2019/001032 filed on January 16, 2019. This case refers to the application and incorporates its content as part of the description of this specification.

1: Layered part 2: The first surface layer 2A: End 3: The second surface layer 3A: End 4: middle layer 4A: End 4B: End 5: movable area 6: Indentation 7: Single layer part 10: Non-woven fabrics for absorbent articles 12: Opening 13: Ministry of Space 14: area 15: area 15A: Bend 20: Non-woven fabrics for absorbent articles 21: area 22: area 23: area 24: area 71: Single layer part 72: Single layer part 110: fiber mesh 120: Support body public material 121: protrusion 122: recess 130: Support base material 131: Protrusion 132: recess T: Taiwan W1: hot air W2: hot air Z1: First side Z2: Second side

Fig. 1 is a cross-sectional view schematically showing a preferred embodiment (first embodiment) of the nonwoven fabric for absorbent articles of the present invention. Fig. 2(A) is an enlarged cross-sectional view of the laminated part shown in Fig. 1, and Fig. 2(B) is an enlarged cross-sectional view showing a variation of the laminated part shown in Fig. 2(A). Fig. 3 is a plan view when the nonwoven fabric for absorbent articles of the first embodiment is viewed from the second surface side. Fig. 4 is a cross-sectional view schematically showing another preferred embodiment (second embodiment) of the nonwoven fabric for absorbent articles of the present invention. Fig. 5 is a plan view when the nonwoven fabric for absorbent articles of the second embodiment is viewed from the second surface side. Fig. 6 is an explanatory diagram schematically showing an example of a preferable manufacturing method of the non-woven fabric for absorbent articles of the first embodiment and the second embodiment, and Fig. 6(A) shows the arrangement of the fiber web on the support material, An explanatory diagram of the step of pressing the support base material into the support body from the above-mentioned fiber web. Figure 6(B) shows the step of pressing the first hot air from the top of the support base material to shape the fiber web As an explanatory diagram, Fig. 6(C) is an explanatory diagram showing the step of removing the support base material and blowing the second hot air from above the shaped fiber web to fuse the fibers.

1: Layered part

2: The first surface layer

3: The second surface layer

4: middle layer

5: movable area

7: Single layer part

10: Non-woven fabrics for absorbent articles

T: Taiwan

Z1: First side

Z2: Second side

Claims (14)

A non-woven fabric for absorbent articles, which has thermoplastic fibers, and It has a plurality of laminated parts that fold a piece of non-woven layout and overlap three or more layers in the thickness direction, The first surface layer located on the first surface side of the non-woven fabric and the second surface layer located on the second surface side in the laminated portion are flat, and the fibers of the first surface layer and the second surface layer are aligned in the plane direction , When the non-woven fabric is viewed from above, there is a region of a single layer portion surrounded by the layered portion. The non-woven fabric for absorbent articles according to claim 1, wherein the area of the single-layer portion has a curved portion at the outer edge in a plan view. The non-woven fabric for absorbent articles according to claim 2, wherein the boundary between the single-layer portion and the laminated portion in the bent portion is arranged on the second surface side of the non-woven fabric. A non-woven fabric for absorbent articles, which has thermoplastic fibers, and It has a plurality of laminated parts that fold a piece of non-woven layout and overlap three or more layers in the thickness direction, The first surface layer located on the first surface side of the non-woven fabric and the second surface layer located on the second surface side in the laminated portion are flat, and the fibers of the first surface layer and the second surface layer are aligned in the plane direction , When the above-mentioned non-woven fabric is viewed from above, there is a single-layer part between adjacent laminated parts, and there is a region where the single-layer part extends in a certain direction, and the single-layer part extends in a direction orthogonal to the certain direction的区。 The area. The non-woven fabric for absorbent articles according to claim 4, wherein the fibers of the single-layer part extending in the above-mentioned certain direction and the single-layer part of the fibers extending in a direction orthogonal to the above-mentioned certain direction show the same orientation direction. A non-woven fabric for absorbent articles, which has thermoplastic fibers, and It has a plurality of laminated parts that fold a piece of non-woven layout and overlap three or more layers in the thickness direction, The first surface layer located on the first surface side of the non-woven fabric and the second surface layer located on the second surface side in the laminated portion are flat, and the fibers of the first surface layer and the second surface layer are aligned in the plane direction , The non-woven fabric has a single-layer portion, and when the non-woven fabric is viewed in a plan view, there is a region of the laminated portion surrounded by the single-layer portion. The non-woven fabric for absorbent articles of claim 6, wherein another single-layer part is further present in the area of the laminated part surrounded by the single-layer part. A non-woven fabric for absorbent articles, which has thermoplastic fibers, and It has a plurality of laminated parts that fold a piece of non-woven layout and overlap three or more layers in the thickness direction, The first surface layer located on the first surface side of the non-woven fabric and the second surface layer located on the second surface side in the laminated portion are flat, and the fibers of the first surface layer and the second surface layer are aligned in the plane direction , The basis weight of the first surface layer is greater than the basis weight of the second surface layer. The non-woven fabric for absorbent articles according to claim 8, wherein the non-woven fabric has a single layer portion between the adjacent laminated portions when viewed from above. The non-woven fabric for absorbent articles according to any one of claims 1 to 9, wherein each layer of the non-woven fabric has a thermally fused portion between the fibers of each layer, and the laminated portion has a folding structure without intervening a joining mechanism. The non-woven fabric for absorbent articles according to any one of claims 1 to 9, wherein the laminated portion is in the middle between the end selected from the first surface layer and the first surface layer and the second surface layer The connecting portion of one end of the layer, the connecting portion of the end of the second surface layer and the end of the first surface layer, and the connecting portion of the other end of the intermediate layer and the end of the second surface layer One or more of them are configured with indentation. An absorbent article using the non-woven fabric for absorbent articles as in any one of claims 1 to 9. An absorbent article which is in a folded state, and the non-woven fabric of the absorbent article is in the state of any one of claims 1 to 9. An absorbent article containing a plurality of absorbent articles in an absorbent article package, wherein the non-woven fabric of the absorbent article is in the state of any one of claims 1 to 9.

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