WO2013129167A1

WO2013129167A1 - Nonwoven fabric

Info

Publication number: WO2013129167A1
Application number: PCT/JP2013/053895
Authority: WO
Inventors: 宏子川口; 正洋谷口
Original assignee: 花王株式会社
Priority date: 2012-02-29
Filing date: 2013-02-18
Publication date: 2013-09-06
Also published as: CN103958756B; JP5439524B2; CN103958756A; MY165592A; RU2014139060A; BR112014020031A8; RU2637404C2; BR112014020031B1; BR112014020031A2; JP2013177715A

Abstract

Provided is a nonwoven fabric comprising first protrusions that protrude from a first surface side, said first surface side being on a side in a planar view of the sheet-type nonwoven fabric, and have an internal space and second protrusions that protrude from a second surface side, said second surface side being opposite to the first surface side, and have an internal space, wherein: the first and second protrusions are alternately disposed continuously along each of different directions intersecting in the planar view of the nonwoven fabric; the first surface side of the top portions of the first protrusions is configured from small protrusions having an outer diameter smaller than the outer diameter of the first protrusions; and the internal space existing inside the first protrusions is communicated with the internal space existing inside the small protrusions to form one continuous internal space.

Description

Non-woven

The present invention relates to a nonwoven fabric.

Absorbent articles such as sanitary napkins, panty liners, disposable diapers, etc., depending on its function, those with a protruding part on one side of the sheet material, those with a protruding part, and many Products with small holes have been developed.
In Patent Document 1, in an uneven or undulating sheet material, convex portions and open concave portions are dispersed throughout, and the fiber aggregate density of the concave portions is more than the fiber aggregate density of the convex portions. Low ones are disclosed. Thereby, it is said that the leakage of the high-viscosity body fluid is surely suppressed or prevented, and also has other necessary characteristics, and has excellent performance as a surface material of the absorbent article. .

Patent Document 2 discloses a multilayer nonwoven fabric in which one side of a sheet material is a protruding portion extending in a streak shape, and the cross-section thereof is a kamaboko (substantially semicircular) shape. The groove part in this nonwoven fabric is formed so that the basis weight is the lowest in the nonwoven fabric, the content of the horizontally oriented fibers is high, and the content of the vertically oriented fibers is low. And the side part of a convex-shaped part has the highest fabric weight in a nonwoven fabric, and the content rate of a longitudinally-oriented fiber is high. As a result, it becomes easy to allow a predetermined liquid such as excrement to pass through, and since the liquid falls into the groove portion, the diffusion area is small (spot property), the contact area with the skin is small (good tactile property), and the liquid return is suppressed. The Therefore, it is difficult for the liquid to remain on the sheet surface (low persistence), and it is possible to prevent the liquid from adhering widely to the skin for a long time.

Patent Literature 3 discloses a laminated nonwoven fabric of an upper layer nonwoven fabric and a lower layer nonwoven fabric, in which a large number of penetrating liquid passage holes are formed. The upper and lower layers are joined to each other around the liquid passage hole of the laminated nonwoven fabric, a first space is formed between the upper layer nonwoven fabric and the lower layer nonwoven fabric, and a second space is formed below the lower layer nonwoven fabric. Further, the arched portion of the upper nonwoven fabric is a small convex portion that is smaller than the arched portion of the lower nonwoven fabric.
The above-mentioned laminated nonwoven fabric is said to have a high cushion feeling and soft feeling due to the above-described spaces. Moreover, it is said that liquid return hardly occurs due to the presence of these spaces. Furthermore, since the arch shape of the upper non-woven fabric is smaller than the arch shape of the lower non-woven fabric, the contact area between the surface sheet and the skin is reduced, and it is considered that the feeling of slipping and slipping are excellent.

Patent Document 4 discloses a polymer web. The polymer web includes a pattern of individual hair-like fibrils, each hair-like fibril being a protruding extension of the polymer web and having side walls defining an open proximal portion and a closed distal portion. The polymer web is thinned at or near the closed distal portion of the hair-like fibril, and the hair-like fibril has an average cross-sectional diameter of 50 μm at half the height of the fibril. It is supposed to be in the range of ˜130 μm.
The hair-like fibrils are said to have an excellent soft feel, which has reduced rewet, i.e. the surface of the top sheet after first passing the top sheet into the underlying absorbent layer. The amount of fluid re-introduced into the chamber.

Japanese Patent Laid-Open No. 03-137258 JP 2008-025081 A JP 2005-334374 A Japanese Patent No. 4642475

The present invention provides a first projecting portion projecting on the first surface side of the sheet nonwoven fabric in plan view and having an internal space, and a second projecting surface projecting on the second surface side opposite to the first surface side and having an internal space. Two protrusions, and the first and second protrusions are nonwoven fabrics arranged alternately and continuously in different directions intersecting in plan view of the nonwoven fabric, and the tops of the first protrusions The first surface side of the first protrusion is configured with a small protrusion having an outer diameter smaller than the outer diameter of the first protrusion, and an internal space existing inside the first protrusion and an internal space existing inside the small protrusion communicate with each other. The nonwoven fabric which comprises one interior space is provided.

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.

It is the fragmentary sectional view showing one desirable embodiment of the nonwoven fabric of the present invention. It is the plane arrangement | positioning figure which showed typically the nonwoven fabric shown in FIG. It is a cross-sectional photograph which image | photographed the cross section of the nonwoven fabric of this invention. It is the fragmentary sectional view which showed the manufacturing process of the nonwoven fabric of this invention.

The present invention provides a skin-friendly feel by reducing the contact area with the skin, is excellent in shape retention of the nonwoven fabric even at the seating pressure of the wearer, the skin contact area is kept small even at high pressure, and the liquid return amount The present invention relates to providing a non-woven fabric that is reduced.

A preferred embodiment of the nonwoven fabric according to the present invention will be described below with reference to FIGS.
The nonwoven fabric 10 of the present invention is preferably applied to a surface sheet of an absorbent article such as a sanitary napkin or a disposable diaper. The first surface side Z1 is used with the skin surface side of the wearer, and the second surface side Z2 is used. Is preferably disposed on the absorbent body (not shown) side inside the absorbent article. Hereinafter, although it demonstrates considering the embodiment which uses the 1st surface side Z1 of the nonwoven fabric 10 shown in drawing toward a wearer's skin surface, this invention is limited to this and is not interpreted.

As shown in FIGS. 1 and 2, the nonwoven fabric 10 of the present invention includes a first protruding portion 11 that protrudes on the first surface side Z1 on the side of the nonwoven fabric of the sheet in plan view and has an internal space 11K, and a first surface side Z1. And a second projecting portion 12 projecting on the second surface side Z2 opposite to the inner surface 12K. These first protrusions 11 and second protrusions 12 are alternately and continuously arranged in different directions intersecting in plan view over the entire surface of the nonwoven fabric 10, for example. The different directions are, as a specific example, an x direction that is one direction of the different directions and a y direction that is different from the x direction and is another direction of the different directions. Here, the convex portion viewed from the first surface side Z <b> 1 is the first projecting portion 11, and the concave portion is the second projecting portion 12. Further, the convex portion viewed from the second surface side Z <b> 2 is the second projecting portion 12, and the concave portion is the first projecting portion 11. Therefore, the first protrusion 11 and the second protrusion 12 are partially shared.
Further, the top portion 11T of the first projecting portion 11 includes a small projecting portion 21 that further projects to the first surface side Z1. As described above, the first surface side Z <b> 1 is formed with a two-stage protruding portion. The small protrusion 21 has a smaller diameter than the first protrusion 11. For example, the small protrusion 21 is preferably arranged so as not to protrude from the first protrusion 11 in plan view. Further, the internal space 21K existing inside the small protrusion 21 and the internal space 11K of the first protrusion 21 are in communication with each other to constitute one internal space 23.
Moreover, when the cross section (refer FIG. 3) of the 1st protrusion part 11 and the small protrusion part 21 is seen, the curve C showing the outline of the cross section outer side of the nonwoven fabric 10 is small protrusion part 21 from the wall part 13 of the 1st protrusion part 11. FIG. The curved line is continuous to the wall part 22 and has an inflection point P between the first projecting part 11 and the small projecting part 21.

The arrangement of the first protrusions 11 and the second protrusions 12 will be described in more detail. In the nonwoven fabric 10 of the present embodiment, a large number of first protrusions 11 are arranged on the first surface side Z1 so as to obliquely intersect in two directions in the vertical and horizontal directions (hereinafter, this arrangement is referred to as an oblique lattice). Sometimes called an array.) This lattice arrangement may be orthogonal (90 °), and in this case, the lattice arrangement may be distinguished as an orthogonal lattice arrangement. In the present embodiment, the first direction (x) and the second direction (y) (see FIG. 2) in the plane preferably intersect at an angle of 30 ° to 90 °. Furthermore, in this embodiment, many 2nd protrusion parts 12 which protrude in the 2nd surface side Z2 of a nonwoven fabric are formed. The second protrusions 12 are also in an orthogonal lattice arrangement, but may be an oblique lattice arrangement. Since the preferable range of the crossing angle is determined along with the first protrusion 11, it is the same as described above. The first projecting portion 11 and the second projecting portion 12 project in opposite directions with respect to the sheet surface. In addition, they are arranged alternately in a relationship that is not in the same position in both a plan view and a side view, that is, there is no overlap.

As described above, the first protrusion 11 and the second protrusion 12 arranged so as to extend in the first direction (x direction) and the second direction (y direction) in the surface are continuous without contradiction to the surface, The nonwoven fabric 10 is comprised. Here, “continuous without contradiction” means that when a specific shape portion is continuous and becomes a surface, the entire surface is continuous with a gentle curved surface without being refracted or discontinuous. In addition, the arrangement | sequence form of the said 1st protrusion part 11 and the 2nd protrusion part 12 is not limited above, What is necessary is just a form which can be arrange | positioned by the arrangement | sequence which can be continued without contradiction, for example, the 1st protrusion part 11 is centered. The six second protrusions 12 may be arranged at the apex of the hexagon and the pattern may be spread in the plane. In this case, since the number of the second protrusions 12 exceeds the number of the first protrusions 11, a state in which the second protrusions 12 are adjacent to each other occurs. Such an arrangement is also included in the meaning that the first protrusions 11 and the second protrusions 12 are arranged alternately.

In this embodiment, the top part 11T of the first protrusion part 11 and the top part 12T of the second protrusion part 12 are rounded truncated cones or hemispheres, and the top part 11T is constituted by the small protrusion part 21, and the first Similar to the projecting portion 11 and the like, it has a rounded truncated cone shape or hemisphere. In the present embodiment, the first and second projecting

portions

11 and 12 and the small projecting portion 21 are not limited to the above shapes, and may have any projecting shape, such as various cone shapes (in this specification, cone shapes). Is actually meant to include a cone, a truncated cone, a pyramid, a truncated pyramid, an oblique cone, etc.). In addition, the said protrusion form of the 1st protrusion part 11 is a virtual shape in the state in which the said small protrusion part 21 is not made, and actually a part of 1st protrusion part top part 11T is a 1st surface in the said protrusion form. A small protrusion 21 is configured to further protrude toward the side Z1.
Moreover, in this embodiment, the 1st,

2nd protrusion parts

11 and 12 and the small protrusion part 21 have the frustoconical or hemispherical

internal space

11K, 12K and the internal space 21K with the round top part similar to the external shape. Yes.

A wall 13 is provided between the top of the first protrusion 11 (hereinafter also referred to as the first protrusion 11) 11T and the opening 11H. The wall portion 13 forms an annular structure in the first projecting portion 11. Moreover, it has the wall part 14 between the top part (henceforth the 2nd protrusion part top part) 12T of the 2nd protrusion part 12, and its opening part 12H. The wall portion 14 forms an annular structure in the second projecting portion 12. The wall portion 14 is shared with a part of the wall portion 13. Furthermore, a wall 22 is provided between the top of the small protrusion 21 (hereinafter also referred to as a small protrusion top) 21T and the opening 21H. The wall portion 22 forms an annular structure in the small protruding portion 21, and also has an annular structure when viewed together with the wall portion 13 of the first protruding portion 11. That is, the wall 13 of the first protrusion 11 and the wall 22 of the small protrusion 21 have a continuous configuration.
The “annular” herein is not particularly limited as long as it has a series of endless shapes in plan view, and may be any shape such as a circle, an ellipse, a rectangle, or a polygon in plan view. In order to maintain the continuous state of the sheet suitably, a circle or an ellipse is preferable. Furthermore, speaking of “annular” as a three-dimensional shape, any ring structure such as a cylinder, an oblique cylinder, an elliptical column, a truncated cone, a truncated cone, a truncated elliptical cone, a truncated quadrangular pyramid, and a truncated oblique pyramid In order to realize a continuous sheet state, a cylinder, an elliptical column, a truncated cone, and a truncated elliptical cone are preferable.

The nonwoven fabric 10 having the first and second projecting

portions

11 and 12 and the small projecting portions 21 arranged as described above does not have a bent portion, and is configured by a curved surface that is continuous as described above. .
Thus, it is preferable that the said nonwoven fabric 10 has a structure continuous in the surface direction. This “continuous” means that there are no intermittent portions or small holes. However, fine holes such as gaps between fibers are not included in the small holes. The small hole is defined as a hole having a diameter equivalent to a circle of 1.0 mm or more, for example.

The fibers constituting the wall portion 13 have fiber orientation in the direction connecting the first protruding portion top portion 11T and the edge portion of the opening portion 11H. In other words, it has fiber orientation in the direction in which the wall portion 13 stands. The wall portion 13 has such fiber orientation over the entire circumference. Moreover, the fiber which comprises the wall part 22 of the small protrusion part 21 has fiber orientation in the direction which ties the edge part of the small protrusion part top part 21T and its opening part 21H. In other words, it has fiber orientation in the direction in which the wall portion 22 stands. Similarly to the wall portion 13, the fibers constituting the wall portion 22 of the small protruding portion 21 have such fiber orientation over the entire circumference. Therefore, it has radial fiber orientation in the direction from the small protrusion top 21T toward the opening 11H of the first protrusion 11.
The fibers constituting the wall portion 14 of the second protrusion 12 have fiber orientation in the direction connecting the second protrusion top 12T and the edge of the opening 12H. The fiber orientation of the wall portion 14 is the same as the fiber orientation of the wall portion 13 at the common portion with the wall portion 13 described above. In general air-through non-woven fabric, when the non-woven fabric is usually produced, the fibers are oriented in the MD direction and are fused as they are. Although the fibers are oriented in the direction, in the cross section in the CD direction, the fibers are oriented in a direction perpendicular to the standing direction, and thus such fiber orientation is not present.

The fiber material that can be used for the nonwoven fabric 10 of the present invention is not particularly limited. Specific examples include the following fibers. Polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers; there are fibers using a thermoplastic resin such as polyethylene terephthalate (PET) and polyamide alone, and there are structures such as a core-sheath type and a side-by-side type. There are composite fibers. In the present invention, it is preferable to use a composite fiber. Examples of the composite fiber include a core-sheath fiber having a high melting point component as a core portion and a low melting point component as a sheath portion, and a side-by-side fiber in which a high melting point component and a low melting point component are arranged in parallel. Preferred examples thereof include fibers having a core-sheath structure in which the sheath component (low-melting-point component) is polyethylene or low-melting-point polypropylene. Typical examples of the fibers having the core / sheath structure include PET (core) / PE ( Examples include fibers having a core-sheath structure such as a sheath), PP (core) / PE (sheath), polylactic acid (core) / PE (sheath), and PP (core) / low melting point PP (sheath). More specifically, the constituent fibers preferably include polyolefin fibers such as polyethylene fibers and polypropylene fibers, polyethylene composite fibers, and polypropylene composite fibers. Here, the composite composition of the polyethylene composite fiber is polyethylene terephthalate / polyethylene, and the composite composition of the polypropylene composite fiber is preferably polyethylene terephthalate / low melting point polypropylene, and more specifically, PET (core). / PE (sheath), PET (core) / low melting point PP (sheath). These fibers may be used alone to form a nonwoven fabric, but can also be used as a mixed fiber in which two or more kinds are combined.

Further, the thickness (TS) of the small protrusion 21 at the time of minute pressurization (0.05 kPa) is preferably 5 to 70% of the thickness T of the nonwoven fabric 10 at the time of minute pressurization. More preferably, it is 10 to 70%, and particularly preferably 30 to 70%. By setting it as such a range, the shape of the small protrusion part 21 is maintained in the state where only the mounting pressure of the absorbent article is applied when the wearer stands or walks (when 0.05 kPa is applied). It is preferable because the contact area with the skin is kept small.
The thickness T of the nonwoven fabric 10 at the time of minute pressurization may be appropriately adjusted depending on the use. However, in consideration of use as a surface sheet for diapers, sanitary products, etc., 2 mm to 6 mm is preferable, and 3 mm to 5 mm is more preferable. By setting it as the range, an appropriate cushioning property can be given to a wearer and the liquid return from an absorber can be prevented. Further, the thickness TS of the small protrusion 21 at the time of minute pressurization is preferably 0.1 mm to 4.2 mm, more preferably 0.2 mm to 4.2 mm, and particularly preferably 0.2 mm for the above reasons. 3 mm to 4.2 mm.

Further, the thickness (TSp) of the small protrusion 21 when pressurized with a pressure of 3.5 kPa is 20 to 70% of the thickness (TS) of the small protrusion 21 when slightly pressurized (0.05 kPa). It is preferable that More preferably, it is 20 to 60%, and particularly preferably 20 to 50%. By adopting such a range, the shape of the small protruding portion 21 is maintained to such an extent that the tactile sensation to the wearer is not deteriorated even at a high pressure (3.5 kPa) such as when the wearer is seated. The contact area with the skin is kept small, and the amount of liquid return can be reduced.

The nonwoven fabric 10 demonstrated by the said embodiment has the following effects.
Since the nonwoven fabric 10 is a small protruding portion 21 having a diameter smaller than that of the first protruding portion 11 formed on the first protruding portion top portion 11T, the skin contact area is reduced and the skin is gentle to the skin. Can be given. Furthermore, since the nonwoven fabric 10 has a shape having the small protruding portion 21 on the first protruding portion 11, the nonwoven fabric 10 has excellent shape retention even under high pressure such as a seating pressure of the wearer, and has a skin contact area. Can be reduced to give a gentle touch to the skin.

The nonwoven fabric 10 has excellent cushioning properties.
Since the nonwoven fabric 10 of this embodiment has the part which protruded not only on the single side | surface of a front and back but on both surfaces, the cushioning characteristic peculiar to the structure is expressed. For example, streak-like projections or single-sided projections will inevitably exhibit elasticity as lines or surfaces. However, according to this embodiment, the two-dimensional movement is well followed and supported by points on both sides. Has a three-dimensional cushioning. Moreover, it has the fiber orientation which orientated toward the edge part of the opening part 11H of the 1st protrusion part 11 from the small protrusion part top part 21T, ie, the direction where the

wall parts

13 and 22 stand. Therefore, firm stiffness is born in the

wall portions

13 and 22, and the fibers have an appropriate cushioning property that prevents the fibers from being crushed in the thickness direction. Furthermore, even if the nonwoven fabric 10 is crushed due to the pressing force due to the fiber orientation of the

walls

13 and 22, the shape restoring force is large, and the initial cushioning force is easily maintained even if the packing state and wearing are continued. . That is, the nonwoven fabric is excellent in shape retention even at the seating pressure of the wearer, the skin contact area is kept small even at the time of high pressurization, and the first and

second protrusions

11 and 12 and the small protrusion 21 are not easily crushed and deformed. If it happens, it is easy to recover.

The said nonwoven fabric 10 is excellent in the touch.
The nonwoven fabric 10 of this embodiment has a small protruding portion 21 and a second protruding portion 12 in both directions, and the

top portions

21T and 12T are rounded. Therefore, whichever surface is the skin side, a good touch that the top sheet softly contacts the skin with respect to the skin is realized. In addition, it is possible to suppress the shape deformation of the entire surface sheet with respect to the pressure while making the feel good by increasing / decreasing the contact area with respect to the pressure at the time of wearing, and it is also possible to easily restore the shape from the pressure deformation. . There also exists an effect | action resulting from said favorable cushioning properties, and a unique good feeling of touch is obtained combined with the dynamic effect | action by a point contact. Moreover, the non-woven fabric 10 is also very soft and soft in that it does not have a hot melt adhesive or heat bonded joint. Moreover, the point contact mentioned above has an effect also when excretion etc. are received, and the smooth touch is implement | achieved. Complementing this smooth touch (absorbing effect), since the fibers have a fiber orientation oriented in the direction in which the

walls

13 and 22 stand, the liquid flows smoothly through the fibers by the oriented fibers. By this, it transfers to the absorber arrange | positioned at the lower surface of the nonwoven fabric 10, and there is little liquid return by the fiber orientation of the

wall parts

13 and 22, and the smooth touch is implement | achieved. Further, the nonwoven fabric 10 itself is excellent in air permeability by maintaining the structure described above, and is also useful for preventing fog due to the effect of point contact.

Furthermore, since the internal space 11K of the first protrusion 11 and the internal space 21K of the small protrusion 21 communicate with each other, the liquid that has passed through the small protrusion 21 smoothly enters the internal space 11K of the first protrusion 11. Since it flows in, liquid permeability is good. And the liquid which permeate | transmitted from the small protrusion part 21 flows into the internal space 11K of the 1st protrusion part 11 from the internal space 21K of the small protrusion part 21 rapidly.

Next, a preferable example of the method for producing the nonwoven fabric 10 will be described below with reference to FIG.
What is necessary is just to employ | adopt suitably the following methods for the manufacturing method of the above-mentioned nonwoven fabric 10. FIG. At that time, the support 30 having the structure shown in FIG. 4A is used as the web-shaped support. The support 30 has a large number of protrusions 31 corresponding to the positions where the second protrusions 12 are shaped, and has holes corresponding to the positions where the first protrusions 11 and the small protrusions 21 are shaped. 32 is arranged. When a fiber web (sometimes simply referred to as “web”) 50 is arranged on the support 30 and hot air 60 having the conditions described later is blown toward the fiber web 50, as shown in FIG. The small protrusion 21 is shaped so as to enter the hole 32 into the top 11T of the first protrusion 11 shaped corresponding to the hole 32. Further, the second protrusion 12 is shaped at the position of the protrusion 31. The height of the small protrusion 21 is appropriately determined depending on the height of the protrusion 31 and the wind speed. In addition, the drawing arrow has shown the flow of the warm air 60 typically.

Specific examples of this production method include the following embodiments.
The fiber web 50 before being fused is supplied from a card machine (not shown) to a device for shaping the web so as to have a predetermined thickness. In the shaping apparatus, first, the fiber web 50 is fixed to the support 30. Next, warm air 60 is blown onto the fiber web 50 on the support 30 (the state shown in FIG. 4 (1)). And the fiber web 50 is shaped so that the shape of the support body 30 may be met (state of FIG. 4 (2)). The temperature of the warm air 60 at this time is preferably 0 to 70 ° C. lower than the melting point of the thermoplastic fiber constituting the fiber web 50 in consideration of a general fiber material used for this type of product. More preferably, it is lower by -50 ° C. In addition, the air velocity of the warm air 60 at this time is set to 70 to 180 m / s, preferably 80 to 150 m / s, from the viewpoint of formability and texture, although it depends on the height of the protrusion 31 of the support 30. s, more preferably 90 to 130 m / s. When the wind speed becomes slower than the lower limit value, the small protrusion 21 is not made. When the wind speed exceeds this upper limit value, an opening is generated at the top portion 11T of the first protrusion 11. In consideration of continuous production, the manufacturing apparatus (not shown) is a conveyor type or drum type capable of transporting the support 30, and winds the molded nonwoven fabric 10 being transported by a roll. An embodiment is mentioned. In this way, the nonwoven fabric 10 of the present invention is obtained. In addition, although MD and CD may be turned to either direction about the nonwoven fabric 10 of this embodiment, when it says in the model figure shown in the said FIG. 2, it is preferable to make drawing vertical direction MD.
The MD is also referred to as a machine direction, which is a fiber web feeding direction when manufacturing a nonwoven fabric, and is an abbreviation for “Machine Direction”. The CD is a direction orthogonal to the MD and is an abbreviation of “Cross Direction”.

Further, the height of the protrusion 31 of the support 30 is set to 0.3 to 5 mm, preferably set to 0.4 to 4 mm, and more preferably set to 0.5 to 3 mm.

Next, each fiber is fused by blowing air at a temperature at which each fiber can be appropriately fused (hereinafter referred to as hot air). The temperature of the hot air at this time is preferably 0 to 70 ° C. higher than the melting point of the thermoplastic fiber constituting the fiber web 50 in consideration of a general fiber material used for this type of product. More preferably, the temperature is higher.

As the thermoplastic fiber, the fiber described above is used. When a composite fiber containing a low melting point component and a high melting point component is used as the thermoplastic fiber, the temperature of the hot air blown onto the fiber web 50 is preferably equal to or higher than the melting point of the low melting point component and lower than the melting point of the high melting point component. . The temperature of the hot air blown to the fiber web 50 is more preferably a temperature not lower than the melting point of the low melting point component and 10 ° C. lower than the melting point of the high melting point component, and more preferably 5 ° C. higher than the melting point of the low melting point component. It is more preferable that the temperature is lower by at least ° C.

The fiber web 50 preferably contains 30 to 100% by mass of thermoplastic fiber, more preferably 40 to 80% by mass. The fiber web 50 may include fibers that do not inherently have heat-fusibility (for example, natural fibers such as cotton and pulp, rayon, and acetate fibers).

When producing the small protrusion 21 on the top 11T of the first protrusion 11 by the above manufacturing method, it is not necessary to bond two layers of non-woven fabric, and from one fiber web 50 by shaping at a time, The nonwoven fabric 10 which has a 2 step | paragraph protrusion part (the 1st protrusion part 11 and the small protrusion part 21) can be produced. For this reason, the manufacturing process is simplified, the production cost can be reduced, and the product cost can be reduced. And since the small protrusion part 21 is produced so that it may enter into the hole 32 between the protrusions 31, since the outer diameter of the small protrusion part 21 is made smaller than the outer diameter of the first protrusion part 11, the skin contact area ratio is reduced. Smaller nonwovens 10 can be made. Moreover, since the internal space 11K of the 1st protrusion part 11 and the internal space 21K of the small protrusion part 21 are connecting, it is excellent also in liquid permeability. Here, the outer diameter of the first protrusion 11 is a diameter of the minimum circumscribed circle when the opening 11H of the first protrusion 11 is viewed in plan, and the outer diameter of the small protrusion 21 is a small protrusion. It is the diameter of the minimum circumscribed circle when the opening 21H of the portion 21 is viewed in plan.

The nonwoven fabric 10 of the present invention can be used for various applications. For example, it can be suitably used as a surface sheet of absorbent articles such as disposable diapers, sanitary napkins, panty liners, urine absorption pads and the like. Furthermore, since the both surfaces of the nonwoven fabric 10 are excellent in air permeability, liquid diffusibility, deformation characteristics at the time of pressing force, etc. due to the concavo-convex structure, between the surface sheet such as diapers and sanitary products and the absorbent body It can also be used as a sub-layer interposed between. In addition, the form utilized as a surface sheet, gathers, an exterior sheet, and a wing of an absorbent article is also mentioned. Furthermore, the form utilized as a wiping wipe sheet | seat, a cleaning sheet | seat, and a filter is also mentioned.

The following additional notes (nonwoven fabric, nonwoven fabric manufacturing method, absorbent article, and disposable diaper) are further disclosed with respect to the above-described embodiment.

The 1st protrusion part which protrudes in the 1st surface side of the side which planarly viewed the nonwoven fabric of the <1> sheet | seat, and has the internal space which protrudes in the 2nd surface side on the opposite side to the said 1st surface side The first and second protrusions are nonwoven fabrics arranged alternately and continuously in different directions intersecting in plan view of the nonwoven fabric,
The first surface side of the top of the first protrusion is composed of a small protrusion having an outer diameter smaller than the outer diameter of the first protrusion, and an internal space existing inside the first protrusion and the inner side of the small protrusion A non-woven fabric in which the internal space existing in the space is connected to form one continuous internal space.
<2> The curve representing the outer contour of the cross section of the nonwoven fabric is a curve continuous from the wall portion of the first protrusion portion to the wall portion of the small protrusion portion, and the first protrusion portion and the small protrusion portion. <1> which has an inflection point between.
<3> The nonwoven fabric according to <1> or <2>, wherein an angle formed by different directions intersecting in plan view is 90 °.
<4> The non-woven fabric according to any one of <1> to <3>, wherein the small protruding portion has a rounded truncated cone shape.
<5> The first projecting portion, the second projecting portion, and the small projecting portion have a frustoconical or hemispherical interior space with a rounded top similar to the outer shape. <1> to <4> The nonwoven fabric according to any one of 1.
<6> The fiber constituting the wall of the first protrusion has fiber orientation in the direction connecting the top of the first protrusion and the edge of the opening, and constitutes the wall of the small protrusion. The non-woven fabric according to any one of <1> to <5>, wherein the fiber has fiber orientation in a direction connecting the top portion of the small protrusion and the edge of the opening.
<7> The fiber constituting the wall portion of the first protrusion and the fiber constituting the wall portion of the small protrusion have fiber orientation in the direction in which the wall portion stands up. <1> to <6> The nonwoven fabric of any one.
<8> The fiber constituting the wall of the first protrusion and the fiber constituting the wall of the small protrusion have fiber orientation in the direction in which the wall rises over the entire circumference of the wall. The nonwoven fabric according to any one of <1> to <7>.
<9> The fiber constituting the wall of the first protrusion and the fiber constituting the wall of the small protrusion are radial fibers in a direction from the top of the small protrusion toward the opening of the first protrusion. The nonwoven fabric according to any one of <1> to <8>, which has orientation.
<10> The fiber constituting the wall portion of the second protrusion has fiber orientation in a direction connecting the top of the second protrusion and the edge of the opening thereof to any one of <1> to <9>. The nonwoven fabric described.
<11> The thickness of the small protrusion when the nonwoven fabric is pressed at a pressure of 0.05 kPa is 5% or more and 70% or less of the thickness of the nonwoven fabric when pressed at a pressure of 0.05 kPa. <1 The nonwoven fabric according to any one of <10> to <10>.
The thickness of the small protrusion when the <12> nonwoven fabric is pressed with a pressure of 0.05 kPa is 10% or more and 70% or less of the thickness of the nonwoven fabric when pressed with a pressure of 0.05 kPa <1. The nonwoven fabric according to any one of <11> to <11>.
<13> The thickness of the small protrusion when the nonwoven fabric is pressurized at a pressure of 3.5 kPa is 70% or more of the thickness of the small protrusion when the nonwoven fabric is pressed at a pressure of 0.05 kPa. % Of the nonwoven fabric according to any one of <1> to <12>.
<14> The thickness of the small protrusion when the nonwoven fabric is pressurized at a pressure of 3.5 kPa is 60% or more of the thickness of the small protrusion when the nonwoven fabric is pressed at a pressure of 0.05 kPa. % Of the nonwoven fabric according to any one of <1> to <12>.
<15> An absorbent article using the nonwoven fabric according to any one of <1> to <14> as a constituent material.
<16> An absorbent article using the nonwoven fabric according to any one of <1> to <14> as a surface sheet.
<17> A disposable diaper using the nonwoven fabric according to any one of <1> to <14> as a constituent material.
<18> A disposable diaper using the nonwoven fabric according to any one of <1> to <14> as a surface sheet.

<19> The fiber web before fusing is disposed on a support having a large number of protrusions and holes set to a height of 0.3 mm or more and 5 mm or less, and then the fiber web is The fiber web is shaped into the shape of the support by blowing warm air with a wind speed set at 70 m / s or more and 180 m / s or less at a temperature higher by 0 ° C. or more and 70 ° C. or less than the melting point of the thermoplastic fiber constituting. A method for producing a nonwoven fabric, wherein the thermoplastic fibers are shaped so as to conform to each other, and thereafter, each of the thermoplastic fibers is fused by blowing hot air at a temperature of 0 ° C. or higher and 70 ° C. or lower with respect to the melting point of the thermoplastic fibers constituting the fiber web. .
<20> The height of the protrusion of the support is set to 0.5 mm or more and 3 mm or less, and the temperature of the hot air is within a range of 5 ° C. or more and 50 ° C. or less with respect to the melting point of the thermoplastic fiber constituting the fiber web. The wind speed is set to 90 m / s or more and 130 m / s or less, and the hot air is set to a high temperature in the range of 5 ° C. or more and 50 ° C. or less with respect to the melting point of the thermoplastic fiber constituting the fiber web. The manufacturing method of the nonwoven fabric as described in <19>.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not construed as being limited by these examples.

[Example 1-5]
In Example 1, a 2.4 dtex × 51 mm core-sheath composite fiber having a core of polyethylene terephthalate and a sheath of polyethylene was supplied from the card machine to the shaping device so that the basis weight was 30 g / m ² . In the shaping apparatus, the fiber web 50 was fixed on the support 30 having a large number of protrusions and air permeability. The MD pitch in the plan view of the protrusion 31 of the support 30 was 8 mm, the CD pitch was 5 mm, and the protrusion height was 0.7 mm. Moreover, the hole diameter of the hole 32 in the support body 30 was 2.8 mm.
Next, the fiber web 50 on the support 30 is shaped by blowing warm air (temperature 130 ° C., wind speed 100 m / s), and the fiber web 50 is shaped along the protrusions 31 on the support 30. The core-sheath structure fibers were fused by switching to hot air having a temperature of 145 ° C. and a wind speed of 5 m / s. The line speed at this time was 100 m / min. Thus, the nonwoven fabric 10 was produced by heat-sealing to obtain a nonwoven fabric test body of Example 1. The thickness T of the nonwoven fabric 10 of Example 1 was 3.8 mm.
In Example 2, the nonwoven fabric 10 was produced under the same conditions as in Example 1 except that the height of the protrusion 31 of the support 30 as a shaping condition was 2 mm. The thickness T of the nonwoven fabric 10 of Example 2 was 3.8 mm.
In Example 3, the nonwoven fabric 10 was produced under the same conditions as in Example 1 except that the height of the protrusion 31 of the support 30 as a shaping condition was 3 mm. The nonwoven fabric 10 of Example 3 had a thickness T of 3.8 mm.
In Example 4, the nonwoven fabric 10 was produced under the same conditions as in Example 2 except that the speed of warm air as the shaping condition was 120 m / s. The thickness T of the nonwoven fabric 10 of Example 4 was 4.2 mm.
In Example 5, the nonwoven fabric 10 was produced under the same conditions as in Example 3 except that the speed of warm air as the shaping condition was 120 m / s. The thickness T of the nonwoven fabric 10 of Example 5 was 4.2 mm.

[Reference Example 1-2]
The reference example 1 produced the nonwoven fabric 10 on the same conditions as the said Example 3 except the wind speed of the warm air as shaping conditions having been 40 m / s. In Reference Example 1, no small protrusion was produced, and the thickness T of the nonwoven fabric 10 was 3.3 mm.
The reference example 2 produced the nonwoven fabric 10 on the same conditions as the said Example 1 except the height of the processus | protrusion 31 of the support body 30 as shaping conditions having been 4 mm. In Reference Example 2, no small protrusion was produced, and the thickness T of the nonwoven fabric 10 was 3.8 mm.
[Comparative Example 1]
In Comparative Example 1, a nonwoven fabric test specimen was produced by the production method of Example 1 described in JP-A-2008-25081. Comparative Example 1 is a nonwoven fabric characterized by having a streak-like uneven shape and openings, and the thickness of the nonwoven fabric was 1.3 mm.

Next, the measurement method and the evaluation method will be described. The following measurement tests were performed using the above-mentioned nonwoven fabric test specimens.

<Measurement of thickness>
The cut surface of the non-woven fabric test specimen is expanded to a size (10 to 100 times) that can be measured with the KEYENCE digital microscope VHX-1000, and the weight becomes 0.05 kPa. Is placed on the nonwoven fabric test body, and the total thickness T of the nonwoven fabric 10 shown in FIG. 1 and the thickness TS of the small protrusion 21 are measured. In addition, thickness TS of the small protrusion part 21 says the height from the part where the small protrusion part 21 stands | starts up on the 1st protrusion part top part 11T to the small protrusion part top part 21T. The measurement was performed 5 times, and on average, the thickness of the nonwoven fabric 10 of the sample was T, and the thickness of the small protrusion 21 was TS (mm). The value at this time was taken as the thickness at the time of 0.05 kPa pressurization.
The measurement method of the thickness (TSp) of the small protrusion 21 at the time of 3.5 kPa pressurization was performed in the same manner except that the weight was adjusted so that a pressure of 3.5 kPa was applied.

<Ratio of the thickness (TS) of the small protrusion part 21 with respect to the thickness (T) of the nonwoven fabric 10>
The “ratio of the thickness (TS) of the small protrusion 21 to the thickness (T) of the nonwoven fabric 10” was expressed as (TS / T) × 100 (%).

<Ratio of the thickness (TSp) of the small protrusion 21 at the time of 3.5 kPa pressurization to the thickness (TS) of the small protrusion 21>
“The ratio of the thickness (TSp) of the small protrusion 21 at the time of 3.5 kPa pressurization to the thickness (TS) of the small protrusion 21” was expressed as (TSp / TS) × 100 (%).

<Measurement of skin contact area ratio at 0.05 kPa pressurization>
The skin contact area ratio at the time of 0.05 kPa pressurization is measured by the following method. A non-woven fabric specimen (10 cm × 10 cm) is uniformly blacked out with a black stamp ink (S-1) manufactured by Shachihata. Place this sheet on the copy paper with the ink surface down, place an acrylic plate (10 cm x 10 cm) on the sheet, and pressurize 0.05 kPa with the acrylic plate mass on it Place a weight to become and pressurize for 30 seconds. Then, quickly weigh, remove the acrylic plate and sheet, and allow the copy paper to air dry at room temperature. After drying, the area ratio of the black portion of the copy paper is determined using an image analyzer [manufactured by Nexus Corp., New Qube], and this value is defined as the skin contact area ratio at 0.05 kPa pressure.

<Measurement of skin contact area ratio at 3.5 kPa pressurization>
The skin contact area ratio at the time of 3.5 kPa pressurization is the above 0.05 kPa addition except that the pressure is 3.5 kPa by the weight and weight of the acrylic plate in the method for measuring the skin contact area ratio at the time of 0.05 kPa pressurization. Measure in the same manner as the skin contact area ratio during pressure.

A method for measuring fiber orientation (orientation angle and orientation strength) will be described below.
Using a scanning electron microscope JCM-5100 manufactured by JEOL Ltd., the sample was placed so that the z-axis direction in FIG. 1 was up and down, and an image taken from a direction perpendicular to the surface to be measured ( The magnification was adjusted so that 10 or more fibers could be measured (100 to 300 times), and the fibers were traced on a transparent PET sheet. The said image was taken in in the personal computer and the said image was binarized using the NexusNew Inc. nextNewcube (stand-alone version) image processing software. Next, the binarized image is subjected to Fourier transform using Fiber Orientation Analysis 8.13 Single software manufactured by Nexus Co., Ltd., which is a fiber orientation analysis program, to obtain a power spectrum, and from an elliptical distribution map, An orientation angle and orientation strength were obtained.

The orientation angle indicates the angle at which the fibers are most oriented, and the orientation strength indicates the strength at the orientation angle. In the measurement of the wall portion, the value of the orientation angle closer to 90 ° indicates that the fibers are oriented from the opening portion 11H of the first projecting portion 11 toward the top portion 21T of the small projecting portion 21. If it is 130 °, it is determined that the fibers are oriented in the direction toward the top portion 21T of the small protrusion 21.
Moreover, it represents that the direction of a fiber has gathered, so that the value of orientation strength is large. The case where the orientation strength is 1.05 or more is assumed to be oriented.
The orientation angle and orientation strength were measured at three locations, and the average of these measured values was taken as the orientation angle and orientation strength of the test specimen. In the examples of the present application, reference examples, and comparative examples, the measurement of the orientation angle and orientation strength of the wall portion was performed on the cross section in the CD direction.

The fiber orientation described above is a concept consisting of the orientation angle and orientation strength of the fiber.
The fiber orientation angle is a concept that indicates in which direction a plurality of fibers having various directions are oriented as a whole, and the shape of the fiber aggregate is quantified. The orientation strength of the fiber is a concept indicating the amount of fibers exhibiting an orientation angle. The orientation strength is less than 1.05 and is hardly oriented, and it can be said that the orientation strength is 1.05 or more. However, in this embodiment, the fiber orientation changes depending on the part. That is, the orientation strength is changed during the transition from a part having a certain orientation angle to a part having a different orientation angle (while the fiber is changing from a state where the orientation strength is strong in one direction to a part showing a strong strength in a different orientation). It has various states such as a weak state and a high state due to reorientation. Therefore, it is preferable that the orientation angle of the fiber is changed between the part showing a strong orientation angle and the part showing a strong orientation angle in another direction even if the orientation strength of the fiber is weak, and the orientation strength is high. Is more preferable. An example of the orientation angle and orientation strength in the present embodiment is as follows. The orientation angle is preferably 50 to 130 °, more preferably 70 to 110 ° with respect to the curved surface structure of the wall portion 22 of the small protrusion 21. The orientation strength is preferably 1.05 or more, more preferably 1.20 or more. The orientation angle with respect to the curved structure of the wall 13 of the first protrusion 11 is preferably 50 to 130 °, more preferably 70 to 110 °, and the orientation strength is preferably 1.05 or more, more preferably 1 10 or more.
Since the orientation direction of the fibers of each of the

wall portions

13 and 22 is the direction toward the top portion 21T of each small protruding portion 21, the cushioning property is exhibited. Moreover, when the nonwoven fabric 10 is used as a surface sheet, when there is a difference in fiber strength between the

wall portions

13 and 22, for example, the small protrusion 21 has higher orientation strength than the first protrusion 11. The small protrusions 21 that are parts that come into contact with the wearer's skin are less likely to be crushed, and the area ratio of contact with the skin can be reduced even during high pressurization, giving a gentle touch to the skin.

Next, a method for measuring the liquid return amount of the nonwoven fabric will be described below.
As an example of the absorbent article 100, the diaper for infants (made by Kao Corporation: Mary's Sarasara Air-Through (registered trademark) M size: made in 2011) is used to remove the surface sheet, and instead of the test piece of the nonwoven fabric 10 (hereinafter, An evaluation baby diaper obtained by fixing the periphery of the nonwoven fabric test body 110) was used.
A pressure of 2 kPa was evenly applied on the nonwoven fabric test body 110, a cylinder having a cross-sectional area of 1000 mm ² placed at the approximate center of the test body was applied, and artificial urine was injected therefrom. As the artificial urine, physiological saline was used, and a total of 160 g of artificial urine was infused 4 times at a rate of 40 g every 10 minutes.
After standing for 10 minutes from the completion of the injection, the above cylinder and pressure were removed. And filter paper No. made by Advantech Co., Ltd. A weight adjusted so that a pressure of 3.5 kPa was applied to an absorbent sheet in which 10 sheets of 4A (100 mm × 100 mm, mass measurement W1) were stacked was placed on the nonwoven fabric specimen 110 around the injection point.
After standing for 5 minutes, the weight was removed, the mass of the filter paper was measured (W2), and the liquid return amount was calculated as in the following equation.

Liquid return amount (g) = Mass of filter paper after pressurization (W2)-Mass of first filter paper (W1)

Table 1 shows the measurement results and evaluation results for each of the above evaluation items.

As is clear from the results shown in Table 1, the test pieces of the nonwoven fabrics 10 of Examples 1 to 5 obtained good results in any evaluation items.

In Reference Example 1, since the wind speed of warm air as a shaping condition was as slow as 40 m / s, no small protrusion was produced. For this reason, the skin contact area ratio at the time of 0.05 kPa pressurization is 50%, and the skin contact area ratio at the time of 3.5 kPa pressurization is 70%, which is higher than that of the example. The feeling of touch at the time slightly decreased. The liquid return amount was also 0.9 g, which was slightly larger than that of the example.
In Reference Example 2, since the protrusion height of the support was as high as 6 mm, no small protrusion was produced. For this reason, the skin contact area ratio at the time of 0.05 kPa pressurization is 56%, and the skin contact area ratio at the time of 3.5 kPa pressurization is 74%, which is higher than that of the example. The feeling of touch at the time slightly decreased. The liquid return amount was also 0.8 g, which was slightly larger than that of the example.
Comparative Example 1 has a skin contact area ratio of 65% at a pressure of 0.05 kPa, a skin contact area ratio of 93% at a pressure of 3.5 kPa, and a touch feeling at a low pressure and a high pressure. It cannot be said that it is excellent. Moreover, the amount of liquid return is as large as 1.3 g, and a sufficient effect is not exhibited.

Therefore, by using each support 10 having the protrusion height described in Example 1 to Example 5 described above, the surface area of contact with the skin can be reduced by performing a process of forming irregularities on the fiber web 50. A shaped non-woven fabric that can give a gentle touch to the skin, is excellent in shape retention of the nonwoven fabric even at the seating pressure of the wearer, has a small skin contact area even at high pressure, and can reduce the liquid return amount Can be manufactured.

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

This application claims priority based on Japanese Patent Application No. 2012-043274, filed in Japan on February 29, 2012, which is incorporated herein by reference. Capture as part.

DESCRIPTION OF SYMBOLS 10 Nonwoven fabric 11 1st protrusion part 11H Opening part of 1st protrusion part 11K Internal space 11T 1st protrusion part top part 12 2nd protrusion part 12K Internal space 12T 2nd protrusion part top part 12H Opening part of 2nd protrusion part 13 1st protrusion 14 Wall portion of the second protrusion portion 21 Small protrusion portion 21H Opening portion of the small protrusion portion 22 Wall portion of the small protrusion portion 23 One continuous internal space

Claims

A first projecting portion projecting on the first surface side of the non-woven fabric sheet in plan view and having an internal space; and a second projecting portion projecting on the second surface side opposite to the first surface side and having an internal space; The first and second protrusions are nonwoven fabrics arranged alternately and continuously in different directions intersecting in plan view of the nonwoven fabric,
The first surface side of the top of the first protrusion is composed of a small protrusion having an outer diameter smaller than the outer diameter of the first protrusion, and an internal space existing inside the first protrusion and the inner side of the small protrusion A non-woven fabric in which the internal space existing in the space is connected to form one continuous internal space.
The curve representing the outer contour of the cross section of the nonwoven fabric is a curve continuous from the wall portion of the first protrusion to the wall portion of the small protrusion, and between the first protrusion and the small protrusion. The nonwoven fabric according to claim 1 having an inflection point.
The nonwoven fabric according to claim 1 or 2, wherein an angle formed by different directions intersecting in plan view is 90 °.
The nonwoven fabric according to any one of claims 1 to 3, wherein the small protruding portion has a rounded truncated cone shape.
The said 1st protrusion part, the said 2nd protrusion part, and the said small protrusion part have a frustoconical shape with a round top part similar to the external shape, or have a hemispherical internal space. The nonwoven fabric described in 1.
The fiber constituting the wall of the first protrusion has fiber orientation in the direction connecting the top of the first protrusion and the edge of the opening, and the fiber constituting the wall of the small protrusion is The nonwoven fabric of any one of Claim 1 to 5 which has fiber orientation in the direction which connects the edge part of the small protrusion part top part and its opening part.
The fiber which comprises the wall part of the said 1st protrusion part, and the fiber which comprises the wall part of the said small protrusion part have fiber orientation in the direction which the said wall part stands up to any one of Claim 1 to 6 The nonwoven fabric described.
The fiber constituting the wall portion of the first projecting portion and the fiber constituting the wall portion of the small projecting portion have fiber orientation in the direction in which the wall portion stands up over the entire circumference of the wall portion. Item 8. The nonwoven fabric according to any one of items 1 to 7.
The fibers constituting the wall of the first protrusion and the fibers constituting the wall of the small protrusion have radial fiber orientation in a direction from the top of the small protrusion toward the opening of the first protrusion. The nonwoven fabric according to any one of claims 1 to 8.
The nonwoven fabric according to any one of claims 1 to 9, wherein the fibers constituting the wall of the second protrusion have fiber orientation in a direction connecting the top of the second protrusion and the edge of the opening.
The thickness of the small protrusion when the non-woven fabric is pressurized at a pressure of 0.05 kPa is not less than 5% and not more than 70% of the non-woven fabric thickness when pressed at a pressure of 0.05 kPa. The nonwoven fabric of any one of these.
The thickness of the small protrusion when the nonwoven fabric is pressurized at a pressure of 0.05 kPa is 10% or more and 70% or less of the thickness of the nonwoven fabric when the nonwoven fabric is pressurized at a pressure of 0.05 kPa. The nonwoven fabric of any one of these.
The thickness of the small protrusion when the nonwoven fabric is pressurized at a pressure of 3.5 kPa is not less than 20% and not more than 70% of the thickness of the small protrusion when the nonwoven fabric is pressed at a pressure of 0.05 kPa. The nonwoven fabric according to any one of claims 1 to 12.
The thickness of the small protrusion when the nonwoven fabric is pressurized at a pressure of 3.5 kPa is not less than 20% and not more than 60% of the thickness of the small protrusion when the nonwoven fabric is pressed at a pressure of 0.05 kPa. The nonwoven fabric according to any one of claims 1 to 12.
An absorbent article using the nonwoven fabric according to any one of claims 1 to 14 as a constituent material.
An absorbent article using the nonwoven fabric according to any one of claims 1 to 14 as a surface sheet.
Disposable diapers using the nonwoven fabric according to any one of claims 1 to 14 as a constituent material.
Disposable diapers using the nonwoven fabric according to any one of claims 1 to 14 as a surface sheet.
The fiber web before fusing is disposed on a support having a large number of protrusions and holes having a height of 0.3 mm or more and 5 mm or less, and then heat constituting the fiber web. The fiber web is adjusted so as to conform to the shape of the support by blowing warm air having a temperature of 0 ° C. to 70 ° C. and a wind speed of 70 m / s to 180 m / s with respect to the melting point of the plastic fiber. A method for producing a non-woven fabric, in which the thermoplastic fibers are fused by blowing hot air at a temperature of 0 ° C. or higher and 70 ° C. or lower with respect to the melting point of the thermoplastic fibers constituting the fiber web.
The height of the protrusion of the support is set to 0.5 mm or more and 3 mm or less, and the warm air is high in the range of 5 ° C. or more and 50 ° C. or less with respect to the melting point of the thermoplastic fiber constituting the fiber web. The temperature is set, the wind speed is set to 90 m / s or more and 130 m / s or less, and the hot air is set to a high temperature in the range of 5 ° C. or more and 50 ° C. or less with respect to the melting point of the thermoplastic fiber constituting the fiber web. The manufacturing method of the nonwoven fabric of Claim 19.