KR20020025045A - The absorbent article - Google Patents

Abstract

Opening films used as surface sheets, such as sanitary napkins, have stickiness to the skin, and surface sheets formed of nonwoven fabrics having wavy grooves also have irritation to the skin and are inferior in liquid permeability. Ridges ridges 16 are formed in the surface layer 10 on which the surface sheet 11 and the reinforcement sheet 12 overlap, and grooves 17 are formed to surround the ridges 16 of the ridges. The hole 13 is opened in the groove 17. Therefore, the liquid imparted from the ridge 16 to the groove 17 is quickly absorbed by the hole 13. In addition, since the ridges exhibit cushioning and elasticity independently of each other, the contact with the skin is soft.

Description

Absorbent article {THE ABSORBENT ARTICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbent articles such as sanitary napkins, disposable diapers, urine collection pads, panty liners, and the like, and more particularly, to absorbent articles having good liquid permeability and capable of imparting a cushioning agent to the wearer's skin.

A porous film is used as a liquid receiving-side surface material of absorbent articles such as sanitary napkins and disposable diapers.

Opening films of this type supply resin films such as olefins to a screen drum having a large number of holes on the surface thereof, soften the resin by hot air, and at the same time, the drum holes in the resin film by suction pressure inside the screen drum. The hole corresponding to the above is formed, and at the same time, the periphery of the opening is projected to one side of the film to form a coating tube.

When the apertured film is used as the liquid-receiving side surface material, the liquid imparted to the film surface passes through the aperture and is absorbed by the liquid absorbing layer. By whitening the apertured film, there is an effect of shielding the color of liquid such as acupuncture points absorbed into the liquid absorbing layer.

In addition, a relatively bulky air through nonwoven fabric or the like is used as the liquid receiving side surface material, and a wave shape and a groove extending in a straight line are alternately formed, and the wave shape and the groove are arranged toward the longitudinal direction of the absorbent article. I'm using something. This has the advantage that the cushioning property of the wearer's skin is abundant, and the contact with the skin is softened.

However, the use of the apertured film cannot lead all liquids to the liquid absorbing layer quickly from the aperture when a large amount of liquid is applied to the surface thereof, and there is a possibility that the liquid remains on the surface of the film. If the liquid remains on the film surface, the liquid flows along the film surface in the longitudinal and transverse directions of the absorbent article, and it is easy to impart wetness to the wearer's skin, and also the liquid may leak from the surface of the absorbent component in the transverse direction. have.

In addition, although some of the opening films are formed with a liquid conduit facing the liquid absorbing layer at the edge of the opening, these liquid conduits are dispersed in a relatively high rigidity portion, so that the opening film has a rigid feeling (stiff contact feeling) on the skin of the wearer. Easy to give

In addition, when the surface material is formed of a nonwoven fabric having a wavy shape and a groove, liquid easily flows along the groove toward the longitudinal direction of the absorbent article, and it is easy to impart wetness to the skin of the wearer in a wide range. In addition, since the wavy shape is formed linearly, when the wavy shape is collapsed by the pressure of the wearer's skin, adjacent waves overlap and the rigidity is easily applied when the skin touches the skin.

This invention solves the said conventional subject, and an object of this invention is to provide the absorbent article which has a surface material which can permeate | transmit a liquid rapidly, and is soft in contact with a wearer's skin.

1 is a cross-sectional view of an absorbent article of the present invention.

Fig. 2 is a sectional perspective view of the II-II line in Fig. 1 showing the surface layer of the first embodiment.

3 is a cross-sectional view of the II-II line.

4 is a partial plan view showing an uneven pattern of the surface layer;

Fig. 5 is a partial plan view showing an uneven pattern of the surface sheet of the second embodiment of the present invention.

6 is a partial cross-sectional view showing the absorbent article of the second embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

1: sanitary napkin

2: back sheet

3: absorbent core

5: side sheet

6: leak-proof wall

7: elastic member

10, 20: surface layer

13, 23: hole

15, 25: compartment area

16, 26: ridge

17, 27: groove

31: depression

32: wavy part

The present invention provides an absorbent article having a back sheet, a liquid permeable surface layer, and a liquid absorbing layer interposed between the back sheet and the surface layer.

The surface layer is formed of a nonwoven fabric, and the surface layer has a bulge portion of a predetermined area convexly raised on the surface side and a groove portion continuously formed to surround each ridge portion and distinguish each ridge portion, and a cross section is formed into an uneven shape. And a hole portion for permeation of liquid is formed in the groove portion.

In this case, it is preferable that a space is formed on the rear surface side of the ridge, and the fiber density of the groove is preferably higher than the fiber density of the ridge.

In this absorbent article, since the ridge of a predetermined area of the surface layer formed of the nonwoven fabric touches the skin with cushioning property, the contact with the skin is soft. In addition, the liquid imparted to the ridge is quickly introduced into the peripheral groove portion, and the liquid which has reached the groove portion flows along the groove portion in the longitudinal and lateral directions of the absorbent article, and is imparted to the liquid absorbing layer by the hole portion located in the groove portion. Therefore, permeation of liquid is quick.

Moreover, this invention is an absorbent article which has a back sheet, a liquid permeable surface layer, and the liquid absorbing layer interposed between the said back sheet and the said surface layer,

The surface layer is formed of a liquid permeable nonwoven fabric, and the surface layer has a recessed portion having a predetermined area recessed toward the liquid absorbing layer and a wavy portion continuously formed to surround each recessed portion and distinguish each recessed portion, and the cross-sectional shape is uneven. And a hole for permeation of the liquid is formed in the corrugated portion.

Also in this case, it is preferable that the fiber density of the said wavy part is higher than the fiber density of the said recessed part.

In this invention, since viscous substances, cells, etc. in the excrement are stopped by the depression of a predetermined area, they do not move on the surface material. In addition, when the wavy fiber density is made high, the liquid is rapidly absorbed into the wavy part, and is rapidly given to the liquid absorbing layer by the hole formed in the wavy part. Moreover, since the wavy part is formed so as to surround the recessed part, deformation | transformation in both longitudinal and horizontal directions is easy compared with the conventional linear wavy part, and the cushioning feeling given to skin becomes favorable.

For example, in the groove portion or the wavy portion, the hole portion is arranged so as to surround the ridge portion or the depression portion, the shape of the arrangement line of the hole portion is a ridge, and the acute angle of the ridge is directed in the longitudinal direction of the absorbent article. The acute angle is in the range of 20 to 70 degrees.

In this case, it is preferable that the length of one side of the ridge formed by the said array line is 3-20 mm.

Further, in the groove portion or the wavy portion, the hole portion is arranged so as to surround the ridge portion or the depression portion, and the area including the ridge portion or the depression portion surrounded by the hole portion is 9 to 400 mm ^2. Is preferably.

Moreover, it is preferable that the height of the acid of the said surface layer is 0.5-5 mm, and it is preferable that the compression rate when the pressure of 4.9 kPa is given to the said surface layer in a KES feel tester is 30 to 80%.

In addition, at least two nonwoven fabrics are formed by overlapping at least two sections of the surface layer with irregularities, and if each of the nonwoven fabrics has the irregularities, the surface member has cushioning properties. In this case, it is preferable that the hydrophilicity of a back layer nonwoven fabric is higher than the hydrophilicity of a surface layer nonwoven fabric.

1 is a cross-sectional view taken along a central cutting line dividing the longitudinal direction of a sanitary napkin as an example of an absorbent article of the present invention, FIG. 2 is a perspective view including a section of the II-II line of FIG. 1, FIG. Sectional drawing, FIG. 4 is a top view which shows the uneven | corrugated pattern of a surface layer, FIG. 5 is a top view which shows the uneven | corrugated pattern of the surface layer of another embodiment, FIG. 6 is a sectional view which shows the absorbent article of the other Example of this invention.

The sanitary napkin 1 shown in FIG. 1 is provided with the absorbent core 3 in the upper surface center region of the liquid-impermeable back sheet 2, and the surface of this absorbent core 3 is covered by the surface layer 10. As shown in FIG. Lost Side sheets 5 and 5 are provided on the left and right both sides of the liquid container side surface of the sanitary napkin 1. The side sheets 5 and 5 are joined to the back sheet 2 at both left and right sides, and are bent at the left and right outer side of the absorbent core 3, and the leakage preventing walls 6 and 6 are formed. have. The side sheets 5, 5, which are folded twice to form the leakage preventing walls 6, 6, are joined to the upper surfaces of the left and right sides of the surface layer 10.

Resilient members 7 extending in the longitudinal direction (Y direction) are joined to the leakage preventing walls 6 and 6, respectively. By the contracting force of the elastic member 7, the sanitary napkin 1 is curved in the longitudinal direction, and as a result, the leakage preventing wall 6 can rise from the liquid receiving side surface of the sanitary napkin 1.

The surface layer 10 is formed of a nonwoven fabric. As shown in FIGS. 2 and 3, the surface layer 10 is formed by overlapping the surface sheet 11 and the reinforcement sheet 12, and the surface sheet 11 and the reinforcement sheet 12 are at least partially. It is joined.

The surface layer 10 is provided with a plurality of hole portions 13 for the coating liquid that penetrate the surface sheet 11 and the reinforcing sheet 12. 2 and 4, the hole portions 13 are arranged in a straight line. In FIG. 4, the alignment lines of the hole portions 13 are shown as L1 and L2. Here, the alignment lines L1 and L2 mean virtual lines passing through the center line of the hole 13 arranged in a straight line. In addition, when the holes 13 are not arranged in a row and arranged in a plurality of rows or randomly within a band-shaped range of a predetermined width, the holes 13 are arranged in the width direction of the band-shaped range in which the holes 13 are arranged. It means an imaginary line through the center.

In the embodiment shown in FIGS. 2 and 4, the partition lines L1 and L2 extend with an angle with respect to the longitudinal direction (Y direction), respectively, and the partition region 15 surrounded by the array line L1 and the array line L2. This is a rhomboid. However, this is not limited to a ridge, but may be a parallelogram, a rectangle, a square, a pentagon, a hexagon, or the like.

As shown in FIG. 4, the acute angle of the partition region 15 of the ridge is directed in the vertical direction (Y direction). In the partition region 15, the ridge 16 is formed in which the front sheet 11 and the back sheet 12 are raised in the surface direction away from the absorbent core 3 together. The shape which looked at the said raised part 16 as a planar pattern is a shape similar to each other of the ridge of the said division area 15, Specifically, it is a shape with rounding attached to each part of the ridge.

The periphery of the ridge 16 is surrounded by the groove 17, and the ridges 16 are divided such that the ridges 16 are independent of each other. In the embodiment shown in Figs. 2 and 4, the groove portion 17 is formed in a straight line with a predetermined width dimension Wa, and the hole portion 13 and the array lines L1 and L2 are the groove portion 17. In the center of the width direction of, is also located at the bottom of the groove 17.

As shown in FIG. 3, the ridge 16 of the surface layer 10 has a substantially flat top surface (surface) 16a, and is smooth from the bottom of the groove portion 17 to the top surface 16a. The curved surface is formed. As shown in FIG. 3, a space 18 is formed on the rear surface of the ridge 16.

Although the surface layer 10 has a sectional shape in which the ridges 16 and the grooves 17 are formed, the uneven shape is an area (width W inside and vertical) covering the absorbent core 3 as shown in FIG. 1. Region within the range of length L). However, the uneven shape may be formed only in the center portion which covers the absorbent core 3 and is narrower than the area surrounded by the width W and the longitudinal length L, and the uneven portion is larger than the outline of the absorbent core 3. It may be formed in a wide area widening outward. Moreover, the said uneven | corrugated part may be formed in the whole surface of the said surface layer 10. FIG.

2 and 3, the reinforcing sheet 12 is mainly provided only in the region where the uneven shape is formed, and in the other region, the surface layer is formed only by the surface sheet 11.

Further, in the preferred embodiment, the uneven shape is heated and pressed in a state where the surface sheet 11 and the reinforcing sheet 12 overlap, and as a result, the fiber density at the bottom of the groove 17 is raised 16. It is higher than the fiber density in the upper surface 16a of ().

In the sanitary napkin 1 using the surface layer 10, the liquid imparted to the surface layer 10 can also pass through the surface sheet 11 and the reinforcing sheet 12, but the liquid is applied to the partition region 15. Therefore, it is led from the upper surface 16a of the ridge 16 to the groove 17 surrounding the periphery thereof. In particular, if the fiber density in the groove 17 is higher than the fiber density in the ridge 16, the liquid imparted to the ridge 16 by capillary action in the groove 16 is rapidly drawn into the groove 17. do. In particular, since the individual ridges 16 are all surrounded by the grooves 17, the liquid imparted to the ridges 16 is led very quickly to the grooves 17 around them.

The liquid guided into the groove portion 17 can be transmitted through the groove portion 17, but since the groove portion 17 is formed obliquely in the longitudinal direction and the horizontal direction, the liquid is vertically and horizontally through the groove portion 17. Is dispersed. Since the hole portion 13 is opened in the groove portion 17, the liquid to be transmitted through the groove portion 17 immediately passes through the hole portion 13 and is sucked into the absorbent core 3. Since the liquid is transmitted through the groove 17, it is difficult for the liquid to be saturated in the groove 17, and the retention of the liquid in the hole 13 and its surroundings can be suppressed, and the absorbent core from the hole 13 is absorbed. A liquid can be provided promptly toward (3).

In addition, since the groove portion 17 is formed so as to surround the individual ridges 16, the direction of induction of the liquid in the groove portion 17 does not extend in multiple directions, and the liquid has a vertical direction and a horizontal direction. It is difficult to cause widening phenomenon.

Further, since the ridges 16 have a predetermined area and are independent of each other, and the spaces 18 are formed on the back side thereof, the ridges 16 can be flexibly deformed by the pressure of the skin. have. Therefore, it is rich in cushioning property and it is difficult to give a feeling of pressure to the skin of the wearer. In addition, since the individual ridges 16 are divided into the grooves 17 and are independent of each other, the deformation of the ridges 16 is not transmitted to the other ridges 16. Therefore, the surface layer 10 can be deformed according to the shape of the skin irregularities of the wearer, and also flexibly conforms not only to the pressure in the thickness direction of the surface layer 10 but also to the longitudinal and horizontal pressures. Therefore, a feeling of wearing becomes excellent. In addition, since each of the ridges 16 is formed differently in the X and Y directions, when the ridges 16 are crushed or collapsed due to the skin pressure of the wearer, adjacent ridges are less likely to overlap each other. It is hard to produce pressure stimulation to skin.

The surface sheet 11 and the reinforcing sheet 12 are spun bonds formed by laminating a fibrous web formed by a card method by hot embossing or hot air, and laminating sheeted air foam nonwoven fabrics and continuous filaments to bond fibers together. Spunlace nonwoven fabric etc. which fastened the fibers of the fiber web formed by the nonwoven fabric and the card method by water flow can be used. Among these nonwoven fabrics, the acid top portion has low density of fibers and is rich in elastic recovery force in the thickness direction, and an air-through nonwoven fabric in which a fiber web is formed by a card method and the fibers are joined by hot air suction is preferable.

Fibers used in nonwoven materials include cores such as PE (polyethylene) / PP (polypropylene), PE / PET, EVOH (ethylene vinyl alcohol copolymer) / PET, PP / PP, PET (polyethylene terephthalate) / PET The heat-sealing fiber is used as a composite fiber of a side sheath structure of the poncho structure which consists of resin which has a melting | fusing point lower than a () component, the eccentric heart structure, or the side-by-side structure of the said resin combination.

In order to obtain a bleaching action as needed, it is preferable to contain the said fiber in the compound of 0.1-10 mass% of inorganic fillers, such as a titanium oxide. By including the inorganic filler, the surface sheet 11 and the reinforcing sheet 12 can be white, and the color of liquid such as acupuncture points absorbed by the absorbent core 3 can be visually concealed.

In addition, the nonwoven fabric of the said surface sheet 11 or the reinforcement sheet 12 is formed of said hydrophobic synthetic fiber. Alternatively, hydrophobic fibers such as regenerated cellulose fibers such as viscose rayon and acetate rayon or natural cellulose fibers may be mixed with the hydrophobic synthetic fibers.

Alternatively, the surface sheet 11 located on the skin side of the wearer is composed of hydrophobic fibers as a main body to form a hydrophobic nonwoven sheet, and the reinforcing sheet 12 is a nonwoven sheet in which the hydrophobic fibers and the hydrophilic fibers are mixed. You may form. Alternatively, a hydrophilic emulsion or the like may be applied to the hydrophobic synthetic fibers constituting the reinforcing sheet 12 for hydrophilic treatment. In this way, the hydrophilicity of the reinforcing sheet 12 is higher than that of the surface sheet 11, and the inclination of the hydrophilicity is set so that it does not penetrate the hole 13 among the liquids provided to the surface sheet 11. The sheet 12 is attracted to the sheet 12, can penetrate the surface sheet 11, and reduce the wettability on the surface of the surface layer 10.

When hydrophilic fibers are mixed with the hydrophobic synthetic fibers as the surface sheet 11 or the reinforcing sheet 12, the ratio of the hydrophilic fibers is 2 to 30% by mass so as to provide moisture absorption performance and not impair the elasticity of the nonwoven fabric sheet. It is preferable to mix | blend with.

As a characteristic of the nonwoven fabric material of the surface sheet 11, it is important to provide cushioning or elasticity. Therefore, the height of the acid of the surface sheet 11 is preferably in the range of 0.3 to 2.0 mm, more preferably in the range of 0.3 to 1.0 mm, and the fineness of 1.1 to 4.4 dtex so that staining of the cloth is less likely to occur. It is preferable to use the range and basis weight in the range of 20-150 g / m <^2> . In addition, in order to obtain cushioning property and elasticity, the ridge part 16 is a longitudinal direction when the nonwoven fabric of the state before forming the hole part 13 was tension | pulled by 1 inch of width | variety, the distance between chucks, and the pulling speed of 100 mm / min. The breaking strength in the (Y direction) is preferably 6.8 N or more, and more preferably in the range of 11.7 to 24.5 N. In addition, the breaking strength in the transverse direction (X direction) is preferably 0.9 N or more, and more preferably in the range of 1.4 to 2.5 N.

2 and 3, in the region covering the absorbent core 3, the surface layer 10 has a double structure in which the reinforcing sheet 12 is bonded to the surface sheet 11. If present, the cushioning properties and elastic recovery rate can be further increased.

Moreover, the average maximum diameter which measured the maximum diameter of each hole part 13 and averaged it is preferable at the point which the range of 0.3-2.0 mm can permeate a liquid, and prevent a liquid from returning to the surface side backwards. . In consideration of the texture and durability of the nonwoven fabric, the occupancy ratio of the hole portion is preferably 5 to 40%, more preferably 7 to 15%.

The hole portion 13 can be formed by breaking the fibers of the nonwoven fabric sheet by applying needling to which heat is applied. Further, the holes 13 may be the same in all dimensions, or may be arranged in combination with holes of different sizes. In the case where the hole portion 13 is formed by the needling, heat is applied to the surface sheet 11 side from the reinforcing sheet 12 side through the needle to which the heat is applied, and further the extraction of the hole portion 13 around the hole portion 13 is performed. The fiber can be projected in the back direction (direction of the absorbent core 3). By protruding the periphery of the hole 13 to the absorbent core 3 side as described above, the liquid in the groove 17 is easily guided from the hole 13 to the absorbent core 3.

In addition, as another method for forming the hole portion 13, a nonwoven fabric sheet having a ridge portion 16 formed between a roll having a plurality of fins formed on its surface and a flat roll or a nonwoven sheet before forming the ridge portion 16 is formed. Is supplied and rotated at a circumferential speed of the two rolls. As a result, the pin may crush the nonwoven sheet, and the thin long hole 13 may be formed in the nonwoven fabric. In this case, when the circumferential speed of one roll is V1 and the circumferential speed of the other roll is V2, the circumferential speed ratio represented by (V2-V1) / V1 is preferably in the range of 10 to 60%.

In the embodiment shown in FIG. 2 and FIG. 4, the said partition area | region 15 enclosed by the array lines L1 and L2 is rhomboid, and the acute angle is facing the vertical direction (Y direction). Therefore, the groove portion 17 provided along the alignment lines L1 and L2 extends obliquely in the horizontal direction while extending in the longitudinal direction. Therefore, even if the liquid just before the liquid penetrates the hole 13 moves along the groove 17, the liquid does not flow directly in the vertical direction or the horizontal direction, and the liquid can be prevented from wide-spreading. . In addition, since the ridge 16 formed in the ridge compartment 15 is also a longitudinal length, each ridge 16 is transverse with respect to the relative movement of the wearer's skin and the sanitary napkin 1 in the horizontal direction (X direction). It is easy to deform flexibly in the direction.

In this way, in order to effectively prevent diffusion of the liquid in the longitudinal direction and the horizontal direction, and to facilitate the movement of the wearer's skin in the horizontal direction, the angle θ of the acute angle of the ridge is in the range of 20 to 70 degrees. Is preferred. In addition, when the ridge formed at such an angle is arranged, the surface layer 10 is seen to be sewn, and the visual product quality is also excellent.

In addition, in order that the contact area to the skin of the individual ridges is appropriate and the individual ridges 16 have a cushioning agent and can be flexibly deformed in the horizontal direction, the distance between the intersection points of the array lines L1 and L2 (one side of the ridge) The length La is preferably in the range of 3 to 20 mm, more preferably in the range of 3 to 15 mm, particularly 5 to 12 mm. In addition, the area of the divided area 15 is 9~400mm ² is preferable, it is also preferably in the range of 20~200 mm ^2. Moreover, it is preferable that the area ratio of the upper surface 16a of the ridge 16 with respect to the area of the said partition area 15 is 60% or more.

The width Wa of the groove 17 is preferably in the range of 2 to 8 mm, more preferably 2 to 5 mm. By making width into the said range, it becomes easy to function as a conveyance path of a liquid. Moreover, it is preferable that the number of the hole parts 13 in the length La of the said one side is two or more and five or less. By providing two or more, the liquid which flowed from the ridge 16 to the groove 17 can be reliably guided to the absorbent core 3, and by setting it as five or less, the fall of the strength of the groove 17 can be avoided. .

In addition, in one sheet, that is, each of the surface sheet 11 and the reinforcing sheet 12, the height H from the rear surface of the groove 17 to the upper surface 16a of the ridge 16 is 0.5 to 5 mm. The range is preferable, More preferably, it is the range of 0.5-2 mm. If it exceeds the said range, the elastic strength of the ridge 16 will fall and it will be inferior to the restorability at the time of deformation, and if it is less than the said range, it will become difficult to form the space 18 inside, and the cushion property of the ridge 16 will fall.

Moreover, the compression rate at the time of applying the pressure of 4.9 kPa in the thickness direction by the KES feel tester manufactured by Karttech as a characteristic of each sheet of the top sheet 11 and the back sheet 12 in which the ridge 16 was formed By setting it as 30 to 80% of this range, More preferably, it can be set as 30 to 60% of range, and the outstanding texture can be obtained. If it is less than the said range, the shape retention characteristic of the ridge 16 will fall and it will become flat, and if it exceeds the said range, rigidity will be provided easily.

In addition, in the said embodiment, when the surface sheet 11 is formed so that it may have the said dimension or the said characteristic, sufficient cushioning property can be obtained, without providing the reinforcement sheet 12. FIG.

FIG. 5 is a partial plan view showing the pattern of the surface layer 20 of the absorbent article of the second embodiment of the present invention.

The surface layer 20 shown in FIG. 5 is also formed from the surface sheet 11 and the reinforcement sheet 12 superimposed, or only from the surface sheet 11. In this embodiment, the individual ridges 26 are circular (or elliptical or oblong). Moreover, the groove part 27 is formed so that the said ridge part 26 may be enclosed, and each ridge part 26 is divided so that it may become independent by this groove part 27. And the hole part 23 is formed in the bottom part of the groove part 27. As shown in FIG.

In this embodiment, the edge portion 26 on the ridge portion 26 of the hole portion 23 located on the most ridge portion 26 side among the hole portions 23 formed in the groove portion 27 surrounding the ridge portion 26. The inner region of the circle (or ellipse or manor) of the smallest diameter passing through becomes the partition region 25. The diameter D of the partition region 25 is preferably in the range of 3 to 20 mm, more preferably in the range of 3 to 15 mm, particularly preferably in the range of 5 to 12 mm. In addition, the area of the partition area 25 is preferably ⁷ to 314 mm ² , and more preferably 20 to 200 mm ² . In addition, the ratio of the upper surface area of the ridge 26 to the area of the partition area 25 is preferably 60% or more.

Also in this embodiment, the ridge 26 is cushioned and the liquid imparted to the grooves 27 is quickly transmitted from the hole 23 to the absorbent core 3.

Fig. 6 is a partial cross-sectional view showing the absorbent article (physical napkin) of the third embodiment of the present invention.

In this embodiment, the surface layer 20 shown in FIG. 2, FIG. 3, and FIG. 4 is provided in the reverse direction of the front and back, and is provided on the absorbent core 3, and the surface layer 30 which the unevenness | corrugation turned to the up-down direction is formed. That is, the surface sheet 11 shown in FIG. 2 and FIG. 3 turns into a reinforcement sheet, and the reinforcement sheet 12 shown in FIGS. 2 and 3 turns into a surface sheet.

And the part which formed the ridge 16 in FIG. 2 and FIG. 3 becomes the substantially ridge-shaped recessed part 31, and the part in which the said groove part 17 was formed becomes the wavy part 32. As shown in FIG. And the hole part 13 arrange | positioned along the said arrangement lines L1 and L2 is formed in the top part of the wavy part 32. As shown in FIG.

Each element such as the angles of the array lines L1 and L2 and the dimensions of the partition region 15 in this embodiment is the same as in the first embodiment shown in FIGS.

In this case, the sheet 12 located on the front side and the sheet 11 located on the back side may be hydrophobic nonwoven fabrics, or may be provided with hydrophilic inclination including hydrophilic fibers only on the sheet 12. In addition, the hydrophilic fibers may be included in both the sheets 11 and 12, or both sheets 11 and 12 may be formed of hydrophobic fibers subjected to hydrophilic treatment.

In the embodiment shown in FIG. 6, when the liquid is imparted to the depression 31, the liquid absorbing force of the absorbent core 3 positioned immediately below it is transmitted through the sheets 11 and 12 so that the absorbent core ( 3) is given. If the fiber density of the wavy part 32 is made higher than the fiber density of the recessed part 31, the liquid given to the recessed part 31 is absorbed by the wavy part 32, and the wavy part 32 Is led to the absorbent core 3 from the inside. Further, the liquid imparted to the wavy portion 32 passes through the hole portion 13 and is guided into the wavy portion 32. In addition, when viscous substances or cells are provided to the depressions 31, they can be prevented from stopping in the depressions 31 and moving in both directions.

Further, since the wavy portion 32 is raised in a ridge pattern or a circular pattern, the wavy portion 32 is in uniform contact with the skin, and the wavy portion 32 has a space therein, so that the cushion portion and elastic recovery properties are rich. Moreover, the wavy part 32 has elastic recovery even when it fell down in the width direction. Therefore, the contact with the skin is soft and there is little irritation to the skin. In addition, even if the liquid remains in the depression 31, the liquid moves away from the skin due to the presence of the wavy portion 32, and the liquid is absorbed into the wavy portion 32 due to the difference in fiber density. This can reduce wetness and soaking.

As the manufacturing direction of the said surface layer 10, 20, 30, the preheating of 90-150 degreeC is given to the roll in which the convex part of the said ridge | bulb (recession part) pattern was formed, and the roll in which the concave part of the said pattern was formed, and a nonwoven fabric between both rolls The sheet (one sheet 11 or two sheets 11 and 12 superimposed) is supplied, the roll pressure is pressed at a pressure of 49 to 294 N, and a ridge (dent) is formed on the nonwoven fabric sheet. At this time, it is preferable to press the sheet between the convex portion and the concave portion, to compress the sheet into the groove portion (the wavy portion), and to increase the fiber density of this portion.

Thereafter, the sheet is supplied between the roll having the pins arranged in a pattern synchronized with the concave-convex pattern and the roll having a flat surface to form a hole.

Or you may wind up the sheet | seat formed by the uneven | corrugated shape in the roll which the said pin arranged, and form a hole part.

In addition, after forming a hole part with a pin, uneven | corrugated shaping | molding may be sufficient, and uneven shaping | molding and opening of a hole may be simultaneously performed.

The liquid-permeable film can also be used as a surface material of not only a sanitary napkin but also a disposable diaper or urine collection pad, and a panty liner.

As stated above, in the absorbent article of the present invention, the surface material is formed of a nonwoven fabric, and furthermore, since the surface material is cushioned, the contact with the skin is smooth. In addition, the liquid can be guided to the grooves or the corrugations and quickly applied to the absorbent core from the holes.

Claims (12)

In the absorbent article which has a back sheet, a liquid permeable surface layer, and the liquid absorbing layer interposed between the said back sheet and the said surface layer, The surface layer is formed of a nonwoven fabric, and the surface layer has a ridge portion having a predetermined area convexly raised on the surface side and a groove portion continuously formed so as to surround each ridge portion and distinguish each ridge portion, and the cross section is formed into an uneven shape. And an aperture for permeation of liquid is formed in the groove. The absorbent article as set forth in claim 1, wherein a space is formed on a back side of said raised portion. The absorbent article according to claim 1 or 2, wherein the fiber density of the groove portion is higher than the fiber density of the ridge portion. In the absorbent article which has a back sheet, a liquid permeable surface layer, and the liquid absorbing layer interposed between the said back sheet and the said surface layer, The surface layer is formed of a liquid permeable nonwoven fabric, and the surface layer has a recessed portion having a predetermined area recessed toward the liquid absorbing layer and a wavy portion continuously formed to surround each recessed portion and distinguish each recessed portion, and the cross-section is uneven. It is formed in the shape and the hole part for permeation | transmission of a liquid is formed in the said wavy part, The absorbent article characterized by the above-mentioned. The absorbent article as set forth in claim 4, wherein a fiber density of said wavy portion is higher than a fiber density of said recessed portion. The said hole part is arrange | positioned so that the said recessed part or the said recessed part may be enclosed in the said groove part or the said corrugated part, The shape of the arrangement line of the said hole part is ridge type, An absorbent article having an acute angle of ridge facing the longitudinal direction of the absorbent article, the inner angle of which is 20 to 70 degrees. The absorbent article according to claim 6, wherein the length of one side of the ridge formed by the array lines is 3 to 20 mm. The said bulging part in any one of Claims 1-7 in which the said hole part is arrange | positioned so that the said bulge part or the said depression part may be enclosed in the said groove part or the said wavy part, An absorbent article having an area of 9 to 400 mm ² including a depression. The absorbent article according to any one of claims 1 to 8, wherein the height of the acid of the surface layer is 0.5 to 5 mm. The absorbent article according to any one of claims 1 to 9, wherein the compressibility is 30 to 80% when a pressure of 4.9 kPa is applied to the surface layer by a KES feel tester. The absorbent article according to any one of claims 1 to 10, wherein at least two cross-sections of the surface layer are formed by irregularities, and at least two nonwoven fabrics overlap each other, and each of the nonwoven fabrics has an irregular shape. The absorbent article as set forth in claim 11, wherein the hydrophilicity of the nonwoven fabric of the back layer is higher than the hydrophilicity of the nonwoven fabric of the surface layer.