KR200377360Y1 - Sanitary napkin - Google Patents

Abstract

The present invention relates to a sanitary napkin having a high function of absorbing a large amount of acupuncture points at a time, preventing the return of the acupuncture points from the liquid absorbing layer, and hiding the color of the acupuncture points.

The surface structure 20 located on the surface of the liquid absorber is composed of a base sheet 21 having a high liquid permeability and a surface sheet 22 which is located on the surface and has a low liquid permeation function. The surface sheet 22 is provided with a plurality of ridges 23, and side openings 35a, 35b, 37a, 37b are opened on the side of the ridge 23. The acupuncture points 45 move into the ridge 23 from the lateral opening, penetrate the liquid permeation hole 21a of the base sheet 21, and are quickly absorbed into the liquid absorbing layer. The ridge 23 can prevent the diffusion of the liquid, prevent the liquid from adhering to the skin, and hide the color of the menstrual blood.

Description

Sanitary napkin {SANITARY NAPKIN}

The present invention relates to a sanitary napkin that is hard to stay on the surface and can be rapidly induced into the absorbent layer.

The sanitary napkin has a liquid absorption layer and a liquid permeable surface sheet covering the skin side surface of the liquid absorption layer. The surface sheet is generally formed of a resin film or a liquid-permeable nonwoven fabric having a large number of liquid permeable holes.

Acupuncture points given on the skin-side surface of the sanitary napkin are relatively high in viscosity and also vary depending on the wearer's individual differences and health conditions, but in a short time, a large amount of acupuncture points may be given to the surface sheet of the sanitary napkin.

For example, when the surface sheet is formed of a resin film having a liquid penetrating hole, a large amount of acupuncture points can be transferred to the liquid absorbing layer in a short time by increasing the opening area of each liquid penetrating hole and increasing the opening area ratio of the liquid penetrating hole. Can be implemented. However, if the opening area of the liquid permeation hole is widened and the opening area ratio is too high, the menstrual blood absorbed by the sanitary napkin will easily return to the skin side surface of the surface sheet and adhere to the skin due to the pressure in contact with the body. . In addition, the acupuncture points absorbed in the liquid absorbing layer are easily visible to the eye through the liquid penetrating hole, thereby making it easy to give the wearer an unsanitary feeling.

On the contrary, when the opening area of each liquid permeation hole is small and the opening area ratio is low, it is easy to prevent the liquid from returning to the surface of the surface sheet and also to easily hide the color of the menstrual blood absorbed by the liquid absorbing layer. When the liquid permeation rate is slow and relatively high viscous acupuncture points are given in a large amount in a short time, the acupuncture points remain on the skin-side surface of the surface sheet, and the acupuncture points are in contact with the skin, and the wearer is likely to be uncomfortable.

As described above, as the surface structure of the sanitary napkin, the opposite functions of liquid permeation function, prevention of return of fluid, and hiding of acupuncture points are required.

In response to these demands, various types of conventional surface structures appearing on the skin-side surface of a sanitary napkin have been proposed.

As described in Patent Document 1 below, the surface material of the sanitary napkin is formed of a hydrophobic film, and a large number of recesses are formed in the hydrophobic film in a recess toward the liquid absorbing layer. And a liquid permeation hole is formed in one part of the inclined part of this recessed part. By using this surface material, acupuncture points can be freely transferred to the liquid absorption layer, the liquid rarely returns from the liquid absorption layer, and the acupuncture points absorbed in the liquid absorption layer are also easy to cover.

As described in the following Patent Documents 2 to 4, a liquid-permeable surface sheet is provided on the skin-side surface of the liquid absorbing layer, and a continuous filament bundle extending in the longitudinal direction makes a gap on the skin-side surface of the surface sheet. In the bundle of the continuous filaments positioned between the fixing portion and the fixing portion, a plurality of loop portions are formed to rise to the skin side. By forming a plurality of loop-like ridges with the continuous filaments, the contact filament of the wearer is improved, and even if the menstrual blood returns from the liquid absorbing layer to the surface of the surface sheet, continuous filaments exist on this surface. Because of this, menstrual blood is hard to reach the skin directly.

Patent Document 1: Japanese Patent Application Laid-open No. Hei 1-34365

Patent Document 2: Japanese Patent Laid-Open No. 2002-65736

Patent Document 3: Japanese Patent Laid-Open No. 2002-65737

Patent Document 4: Japanese Patent Laid-Open No. 2002-69781

What was described in the said patent document 1 is intended to make it easier to transfer acupuncture points to a liquid absorption layer in this recessed part by forming many recessed parts in the surface material formed with a hydrophobic film, and inducing acupuncture points into the said recessed part. However, the opening of the surface material is formed only in the inclined portion of the concave portion, and the top portion of the concave portion is in a flat state without the opening. Therefore, when a large amount of relatively high viscous acupuncture points are given to the surface material in a short time, the inside of the concave portion is saturated with the acupuncture points, and the acupuncture points are spread on the flat part and easily spread around. Therefore, acupuncture points remain on the skin side surface of the surface material and are likely to come into contact with the skin.

Next, as described in Patent Literatures 2 to 4, by forming a ridge formed by looping continuous filaments on the surface of the surface sheet, a feeling of contact with the skin was improved, and menstrual blood remained on the skin side surface of the surface sheet. Even if a continuous filament exists, it is effective to prevent the acupuncture points from directly contacting the skin. However, since the function for inducing acupuncture points given in the surface sheet to the liquid absorbing layer depends only on the liquid permeation function of the surface sheet, when the liquid permeation function is increased by increasing the opening area of the liquid permeation hole of the surface sheet, the liquid returns. Problems are likely to occur.

The present invention solves the above-described problems, and even when a large amount of acupuncture points is given, the acupuncture points can be quickly transferred to the liquid absorption layer, and the effect of preventing the return of the liquid and the acupuncture points absorbed in the liquid absorption layer. It aims at providing the sanitary napkin which has a high effect of concealing a color, and also has a favorable touch with skin.

In the sanitary napkin having a liquid absorption layer and a surface structure covering the skin side surface of the liquid absorption layer,

The surface structure has a liquid-permeable foundation sheet covering the skin-side surface of the liquid absorption layer, and a surface sheet located on the skin-side surface of the foundation sheet, wherein the surface sheet has at least a skin-side surface of a resin film. Formed,

The surface sheet is provided with a plurality of ridges which are further raised from the skin side surface of the base sheet to the skin side, and side openings leading to the base sheet are formed at the side of the ridge.

The surface structure of the sanitary napkin of this invention is comprised from the base sheet which has a liquid permeation function which covers a liquid absorber, and the surface sheet in which at least the skin side surface which covers the surface of this base sheet was formed of the resin film. The side opening is opened in the ridge formed of the surface sheet, and the base sheet is shown directly under the ridge. Therefore, when a large amount of relatively high viscous acupuncture points is given in a short time, the acupuncture points are given to the base sheet via the lateral opening of the ridge and penetrated by the base sheet to be absorbed by the liquid absorbing layer.

Further, since the ridge formed of the surface sheet is deformable toward the base sheet by the weight of the menstrual blood itself, the menstrual blood enters the lateral opening of another ridge adjacent to the deformed ridge and is given to the base sheet. Therefore, when a large amount of acupuncture points is given, the acupuncture points are quickly given to the liquid absorbing layer, and it can be prevented from spreading widely on the skin side surface of the sanitary napkin.

In addition, since the surface sheet on which the ridge is formed is formed at least on the skin side with a resin film, even if the menstrual blood penetrates through the base sheet from the liquid absorbing layer, the menstrual blood is covered with this surface sheet. This makes it difficult to attach directly to the skin. In addition, since the skin side surface of the surface sheet is formed of a resin film, the color of the menstrual blood absorbed by the liquid absorbing layer can be hidden by the surface sheet, which makes it feel hygienic when the skin side surface of the sanitary napkin being worn is visually seen.

According to the present invention, a plurality of slits are formed in the surface sheet extending in the vertical direction at intervals in the horizontal direction, and are formed between the slits and the slits adjacent in the horizontal direction. The ridge is formed by the portion of the surface sheet, and the surface sheet and the base sheet are joined at portions other than the ridge.

Further, in the present invention, the lateral spacing of the slits is different depending on the place, and the wide portion fitted into the slit is raised to the skin side so that the ridge is formed, and the narrow portion having a smaller width dimension than the wide portion fitted into the slit is formed. It can be configured as being located closer to the surface of the base sheet than the top of the ridge.

As mentioned above, the said ridge | bulb and a side opening part can be formed easily by putting a slit into a surface sheet. Particularly, in the structure in which the wide section and the narrow section partitioned by the slit are formed on the surface sheet and the ridge is formed in the wide section as described above, the base sheet is covered with the narrow section or the narrow section in portions other than the ridge section. As a result, a low ridge is formed. Therefore, the contact feeling to the skin of the surface becomes soft, and the entire area of the base sheet can be covered with the surface sheet, and it is easy to prevent the return of menstrual blood from the liquid absorbing layer, and the color of the menstrual blood absorbed by the liquid absorbing layer can be prevented. It becomes easy to conceal with a surface sheet.

In the above, it is preferable that the wide portions and the narrow portions are alternately formed in the horizontal direction.

For example, according to the present invention, the raised portion can be formed by deforming the portion of the surface sheet sandwiched by the slit in the pressurizing step or the pressurizing / heating step toward the skin side.

Alternatively, in a state in which the surface sheet is extended in the horizontal direction and contracted in the longitudinal direction, the surface sheet is bonded to the base sheet at various places so that the slit and the part sandwiched by the slit are raised toward the skin side, and the ridge is raised. It is also possible to make the addition formed.

In addition, the present invention, the surface sheet is a plurality of band-like sheets are separated from each other and extend continuously in the longitudinal direction, and each band-like sheet is bonded to the base sheet at the joint spaced in the longitudinal direction The strip | belt-shaped sheet part between adjacent joining parts may be raised to the skin side from a base sheet, and the said raised part can be comprised.

In this case, it is preferable to set it as the structure where the said strip | belt-shaped sheet is arrange | positioned at intervals in the horizontal direction, and the coating resin film which covers the surface of the said base part sheet | seat is provided between adjacent strip | belt-shaped sheets.

In addition, the said coating resin film may have a liquid permeation hole, or may not have a liquid permeation hole. However, it is preferable that the liquid permeation function of this coating resin film is lower than the liquid permeation function of a base part sheet. In the above invention, since the base sheet is covered with the coating resin film in the portion having no ridge, the menstrual blood can be prevented from returning from the liquid absorbing layer to the surface of the base sheet, and the color of the menstrual blood absorbed by the liquid absorbing layer. Can be easily concealed by the surface sheet and the coated resin film.

In the above, the raised portion can be formed by deforming the band-shaped sheet toward the skin side in a pressing step or a pressing / heating step.

Alternatively, even when the base sheet is shrunk in the longitudinal direction, and the gap between the joint between the surface sheet and the base sheet approaches the longitudinal direction, the surface sheet is raised from the base sheet and the ridge is formed. good.

In the present invention, when the sanitary napkin is deformed so that the skin-side surface is recessed, the surface sheet may be raised from the base sheet to form the raised portion.

That is, when the sanitary napkin is deformed to fit the shape of the body or when the sanitary napkin is provided with a leakage preventing wall that exerts an elastic contraction force in the longitudinal direction, the surface of the skin is recessed by this elastic contraction force. When the curved sheet is deformed, the surface sheet may be raised to form the raised portion, or the raised height of the raised portion may be increased by the deformation.

In addition, the present invention is configured such that the openings are formed in the resin film forming the surface sheet, the openings are expanded or the resin film is broken around the openings, so that the side openings are formed. Can be.

In this structure, the side opening can be formed even if a slit is not formed, by using what has openings as a surface sheet.

Moreover, in this invention, it is preferable that the said base part sheet is formed with the liquid permeable sheet | seat with higher liquid permeability function than the said surface sheet.

Since the base sheet has excellent liquid permeability, the menstrual blood passing through the lateral opening can be quickly transferred to the liquid absorbing layer through the base sheet. In addition, since the liquid permeation function of the surface sheet is inferior to that of the base sheet, it is easy to prevent the menstrual blood from adhering to the skin by the surface sheet.

In the present invention, the base sheet is preferably formed of a resin film having at least a skin-side surface having a plurality of liquid permeation holes.

By forming the base sheet with a resin film and forming a liquid permeation hole having a relatively large opening area and a high opening area ratio, the acupuncture points given to the base sheet can quickly penetrate the liquid permeation hole and be absorbed by the liquid absorbing layer. .

In this case, a liquid permeation hole is formed in the resin film appearing on the skin-side surface of the surface sheet, and the opening area ratio of the liquid permeation hole of the surface sheet is lower than that of the liquid permeation hole of the base sheet. Can be.

However, the structure in which the said raised part formed from the said surface sheet does not have many liquid permeation hole may be sufficient.

1 is a perspective view showing the sanitary napkin of the first embodiment of the present invention with the skin side surface upward, FIG. 2 is an enlarged half sectional view of the sanitary napkin of FIG. 1 taken along the line II-II, and FIG. 3 is an enlargement of the modified example. Fig. 4A is an enlarged exploded perspective view showing the structure of the surface structure, and Fig. 4B is an explanatory view for explaining the shape of the opening of the ridge.

As shown in FIG. 1, the sanitary napkin 1 of embodiment of this invention is a longitudinally long shape in which the length dimension of a longitudinal direction (Y direction) is longer than the width direction (X direction) width dimension, and a longitudinal centerline (OO) is symmetrical shape through.

The external shape of the sanitary napkin 1 is convexly curved with the leading edge 1a facing the wearer's abdomen and the trailing edge 1b facing the buttocks. The sanitary napkin 1 has wing portions 2 and 2 extending in both the left and right sides, and in front of the wing portions 2 and 2, the front side edge portions 1c and 1c of the protruding curve shape toward the left and right outwards. The rear side edges 1d and 1d of the protruding curve shape are formed to the left and right sides later than the wings 2 and 2.

As shown in the cross-sectional view of FIG. 2, the structure of the sanitary napkin 1 is a surface which covers the skin-side surface of the liquid-absorbing back sheet 3 and the skin-absorbing layer 4 covering the wear-side surface of the liquid absorbing layer 4. It has a structure 20. The surface structure 20 is composed of a base sheet 21 covering the skin side surface of the liquid absorbing layer 4 and a surface sheet 22 positioned on the skin side surface of the base sheet 21. . The peripheral part of the liquid absorption layer 4 is shown with the broken line in FIG. 1, and the liquid absorption layer 4 exists in most parts except the said wing part 2 of the sanitary napkin 1. As shown in FIG.

Liquid blocking side sheets 5 and 5 are provided on the left and right sides of the sanitary napkin 1, and the left and right sides of the base sheet 21 are fitted by the back sheet 3 and the side sheet 5. In this case, the back sheet 3, the base sheet 21, and the side sheet 5 are bonded to each other. Opposite edges 5a of each side sheet 5 are located on the left and right sides of the liquid absorbing layer 4, and portions sandwiched by the opposing edges 5a and opposing edges 5a are the liquid absorbing regions 6. It is becoming.

The wing parts 2 and 2 are formed because the back sheet 3 and the side sheets 5 and 5 are bonded to each other. On the opposite side to the liquid absorption region 6, pressure-sensitive adhesive layers 7 and 7 are formed on the surface of the back sheet 4, and the pressure-sensitive adhesive layer 8 is also formed on the skin-side surface of each wing 2. ) Is formed.

The back sheet 4 is formed of a resin film such as liquid-blockable polyethylene resin. The liquid absorbing layer 4 is formed of a mixture of pulverized pulp and superabsorbent polymer (SAP), or airlaid pulp in which pulp laminated by airlaid is fixed with a binder. The lateral sheet 5 is liquid-blocking, for example, a meltblown nonwoven fabric, a spunbond nonwoven fabric, a spunbond formed of polyethylene (PE) resin fiber, polypropylene (PP) resin fiber, polyethylene terephthalate (PET) resin fiber, or the like. The nonwoven fabric / melt blown nonwoven fabric / spunbond nonwoven fabric is formed by the laminated nonwoven fabric etc. which overlapped.

As shown in Fig. 1, in the liquid absorption region 6, a compression groove in which the liquid absorption layer 4, the base sheet 21, and the surface sheet 21 are compressed together is formed. The compression grooves are a pair of longitudinal compression grooves 11 and 11 extending in the longitudinal direction and the front horizontal compression grooves 12 formed in a convex pattern toward the front by connecting the two longitudinal compression grooves 11 and 11. And rear longitudinal compression grooves 13 formed in a convex pattern by connecting both longitudinal compression grooves 11 and 11 to the rear.

In the central absorbing region 14 surrounded by the longitudinal compression grooves 11 and 11, the front horizontal compression grooves 12 and the rear horizontal compression grooves 13, a plurality of ridges 23 are formed by the surface sheet 22. Formed.

4A shows an enlarged view of the structure of the surface structure 20 including the surface sheet 22 and the foundation sheet 21 forming the ridge 23.

In the sanitary napkin 1 of 1st Embodiment, the base part sheet 21 and the surface sheet 22 are formed with the resin film together.

The resin film forming the base sheet 21 is, for example, a PE resin film, a PP resin film, or the like, and inorganic fillers such as titanium oxide, barium sulfide, and calcium carbonate are mixed and whitened. The base sheet 21 is provided with a plurality of liquid permeation holes 21a regularly, so that the liquid permeation function is increased. The opening area (actual opening area) of each liquid permeation hole 21a is relatively large, preferably 0.2 to 30 mm ² , and preferably 1 to 30 mm ² . In addition, the opening area ratio of the liquid permeation hole 21a is about 5 to 40% in the central absorption region 14.

In addition, the base sheet 21 is coated with a surfactant on the surface or a surfactant inside the film so as to easily draw acupuncture points on the surface thereof and easily move to the liquid absorbing layer 4 through the liquid permeation hole 21a. The hydrophilized thing is preferably used by, for example, beating it.

The surface sheet 22 is a low density polyethylene (LDPE) resin film, a linear low density polyethylene (LLDPE) resin film, a high density polyethylene (HDPE) resin film, a PP resin film, or a resin film blended with the resin, and the ridge 23 At the time of the fabric before forming), the one which does not have a liquid permeation hole and does not exhibit the liquid permeation function is used in most cases.

On the other hand, in the embodiment of FIG. 1, the portions other than the central absorption region 14 surrounded by the longitudinal compression grooves 11 and 11, the front horizontal compression grooves 12, and the rear horizontal compression grooves 13 are raised portions ( Since 23 is not formed, it is preferable that the liquid permeation hole is formed in the surface sheet 22 in the area | region where this ridge 23 is not formed. However, this liquid permeation hole has a smaller opening area and lower opening area ratio than the liquid permeation hole 21a of the base sheet 21.

As shown in Fig. 4A, the thickness of the resin film is preferably 10 to 150 m, more preferably 15 to 80 m so that the ridge 23 is easily deformed freely by the weight of the menstrual blood itself. to be.

In the resin film forming the surface sheet 22, the inorganic filler is mixed and whitened. In addition, since the acupuncture points are quickly transferred to the base sheet 21, the surface sheet 22 is preferably surface-water-repellent, and in order to transfer the acupuncture points to the base sheet 21, the hydrophilic treatment is reversed. It may be one.

The ridge 23 of the surface sheet 22 can be formed, for example, by the steps shown in FIGS. 6A and 6B.

As mentioned above, in 1st Embodiment, although the resin film itself which becomes the surface sheet 22 does not have a liquid permeation function, as shown to FIG. 6 (a), it spaces in the vertical direction (Y) direction. Similarly, slits 24 arranged in a straight line with each other and slits 25 arranged in a straight line at intervals in the vertical direction are formed. The individual slits 24 and slits 25 have the same length in the longitudinal direction and are parallel to each other. Moreover, it is formed in the same phase and same pitch in the vertical direction. The space | interval of the slit 24 and the slit 25 in the horizontal direction (X direction) is W1.

The slit 26 and the slit 27 are equal in length to the slit 24 and the slit 25 in the longitudinal direction (Y direction), respectively. The slits 26 and the slits 27 are parallel to each other and are linearly arranged at the same phase and the same pitch in the vertical direction. The space | interval of the slit 26 and the slit 27 in the X direction is W1 same as the above. However, as for the slit 26 and the slit 27, the arrangement phase of the slit 24 and the slit 25 is shifted half-cycle in the vertical direction (Y direction).

The space | interval of the slit 25 and the slit 26 in the horizontal direction (X direction), and the space | interval of the slit 27 and the slit 24 in the horizontal direction (X direction) are all W2, and the space | interval W2 is sufficient more than the said space | interval W1. It is small.

As shown in Fig. 6A, the pairs of pairs of slits 24 and 25 and the pairs of pairs of slits 26 and 27 are alternately arranged in the horizontal direction (X direction). The portion sandwiched between the slit 24 and the slit 25 is a portion sandwiched between the first wide portion 31, the slit 26, and the slit 27 of the width dimension W1. The part sandwiched by the second wide portion 32, the slit 25 and the slit 26, the part sandwiched by the first narrow width 33, the slit 27 and the slit 24 of the width dimension W2, It is the 2nd narrow part 34 of the width dimension W2.

6 (b) shows a forming mold 40 for molding the surface sheet 22 having a plurality of slits as described above. The molding die 40 is provided with a support die 41 and a pressing die 43 facing each other. The support frame 41 is formed with a plurality of molded convex portions 42. Each shaping | molding convex part 42 has the same shape and the same dimension, the upper surface 42a is curved toward a Y direction, and both side surfaces 42b and 42b are a vertical plane.

Each molded convex part 42 is arrange | positioned so that it may oppose each of the 1st wide part 31 and the 2nd wide part 32 of the said surface sheet 22. As shown in FIG. Moreover, the said 1st narrow part 33 and the 2nd narrow part 34 oppose each other between the shaping | molding convex part 42 and shaping | molding convex part 42 which adjoin in a X direction.

The pressing frame 43 is formed with a pressing portion 44 which fits in a minimum gap between the forming convex portion 42 and the forming convex portion 42 arranged side by side in the longitudinal direction.

The surface sheet 22 having a plurality of slits is sandwiched between the supporting frame 41 and the pressing frame 43 to press the surface sheet 22 with the supporting frame 41 and the pressing frame 43 at room temperature or Alternatively, as shown in FIG. 4 (a), the support frame 41 and the press frame 43 are pressurized in a state heated at a temperature below the softening point of the resin film constituting the surface sheet 22. A plurality of ridges 23 are formed in the sheet 22.

In this embodiment, although the shape and dimension of all the ridges 23 are the same, the 1st wide part 31 fitted by the said slit 24 and the slit 25 was pressed by the said shaping | molding convex part 42, and it shape | molded The raised ridge is denoted by reference numeral 23A, and the ridge formed by pressing the second wide portion 32 sandwiched between the slit 26 and the slit 27 by the molded convex portion 42 is denoted by reference numeral 23B.

Since the jaws of the slits 24 and 25 and the jaws of the slits 26 and 27 are formed half-cycled in the Y direction, the raised portions 23A and the raised portions 23B are shifted by half pitch positions in the Y direction. Is formed. In addition, the ridge 23A and the ridge 23B are alternately arranged in the horizontal direction (X direction).

In FIG. 4A, when the structure of the ridge 23A is described, in the ridge 23A, the first wide portion 31 separated by the slit 24 and the slit 25, According to the shape of the upper surface 42a of the molded convex part 42, it becomes the raised shape curved.

Hereinafter, the edge of the surface sheet formed by separating into slits is called a separating edge. One separation edge 24b formed by the surface sheet 22 being separated from each other by the slit 24 becomes an edge of the first wide portion 31, and this separation edge 24b is the separation of the other side. By greatly moving upward from the edge 24a, a lateral opening 35a is formed which is largely opened to the side of the ridge 23A.

Similarly, one separation edge 25b separated from each other by the slit 25 becomes the edge of the first wide portion 31, and this separation edge 25b is upward from the other separation edge 25a. By greatly moving away, the side opening part 35b which opens large to the side of the ridge 23A is formed. Further, a bottom opening 36 is formed between the separating edge 24a and the separating edge 25a immediately below the first wide portion 31 forming the ridge 23A, and within the bottom opening 36. And the base sheet 21 positioned below it is exposed.

In FIG.4 (b), the shape of the said side opening part 35a, 35b is shown as projecting in the X direction. In addition, hatching is attached | subjected to the bottom opening part 36 in FIG.4 (b).

Similarly, also in the ridge 23B, one separating edge 26b separated by the slit 26 is largely farther upward from the other separating edge 26a, and a lateral opening 37a is formed. The lateral opening 37b is formed because the separation edge 27b separated by the slit 27 is far away from the separation edge 27a upwards. Further, immediately below the second wide portion 32 forming the ridge 23B, a bottom opening 38 exposing the base sheet 21 between the separating edge 26a and the separating edge 27a is provided. It is opening.

As shown to Fig.4 (a), in 23 A of individual ridges, the Y direction of both ends of the 1st wide part 31 in the Y direction, ie, the rising base part from the base sheet 21, is Y direction. The front and rear openings 39a are formed to be opened toward the side. Similarly, each ridge 23B also has front and rear openings 39b which are opened in the Y direction at both end portions of the second wide portion 32 in the Y direction, that is, at the rising base portion from the base sheet 21. Formed. The opening area of each front-back opening part 39a, 39b is smaller than the opening area of each side opening part 35a, 35b, 37a, 37b.

The first narrow portion 33 between the slit 25 and the slit 26 is not protruded upwards like the ridge 23, but is located below the top of the ridge 23 so that the base sheet ( 21) covering the surface. Similarly, the second narrow portion 34 sandwiched between the slit 27 and the slit 24 also covers the surface of the base sheet 21 without being greatly raised upward like the ridge 23.

In the surface structure 20, the base sheet 21 and the surface sheet 22 are joined to each other at portions other than the ridges 23 (23A, 23B).

Next, the absorption function of the menstrual blood in the sanitary napkin 1 of the first embodiment will be described. As shown in Fig. 2, the sanitary napkin 1 is covered with a base sheet 21 having a high liquid permeability and covered with the skin side surface of the liquid absorbing layer 4, and on the skin side surface thereof, the base portion. The surface sheet 22 having a lower liquid absorption function than the sheet 21 (which does not exhibit the liquid permeation function in the first embodiment) is superimposed, and in the central absorption region 14, the surface sheet 22 is attached to the surface sheet 22. As a result, a plurality of loop-shaped ridges 23 (23A, 23B) are formed.

When acupuncture points are given to the central absorption region 14, the acupuncture points are directly below the ridges 23A through the lateral openings 35a and 35b which are largely opened toward the X side in the ridges 23A. ) Is given to the base sheet 21 being exposed. Similarly, the menstrual blood is exposed to the base sheet (exposed to the bottom opening 38 immediately below the ridge 23B through the lateral openings 37a and 37b which are largely opened in the X direction in the ridge 23B). 21).

Since the base sheet 21 is formed with a high opening area ratio of the liquid penetration hole 21a having a relatively large opening area, the menstrual blood given to the bottom openings 36 and 38 is a liquid penetration hole of the base sheet 21. It rapidly penetrates 21a and is absorbed by the liquid absorbing layer 4 below it.

FIG. 4 (a) schematically shows a state in which the menstrual blood 45 having a relatively high viscosity is given to the central absorption region 14. Given the relatively viscous acupuncture points 45, the first wide part 31 forming the ridges 23A is concave in shape toward the base sheet 21 by the weight of the acupuncture points 45 itself. do. Immediately thereafter, the menstrual blood 45 flows into the lateral opening 37a of the ridge 23B located laterally of the deformed ridge 23A, and the bottom opening 38 immediately below the ridge 23B. It is immediately given to the base sheet 21 located at and absorbed into the liquid absorbing layer 4 through the liquid penetrating hole 21a.

Therefore, even when a large amount of acupuncture points are given in a short time, the acupuncture points are given to the bottom openings 36 and 38 via the lateral openings 35a, 35b, 37a, and 37b, and exposed to the bottom openings 36 and 38. It is rapidly absorbed into the liquid absorbing layer 4 through the base sheet 21.

In addition, even if the pressure acts on the sanitary napkin, the menstrual blood absorbed by the liquid absorbing layer 4 penetrates through the liquid permeation hole 21a of the base sheet 21 and seeps into the skin side surface of the base sheet 21. On the surface of the base sheet 21, a first wide portion 31 for forming the ridge 23A, a second wide portion 23B for forming the ridge 23B and ridges 23A, 23B are formed. Since the 1st narrow part 33 and the 2nd narrow part 34 in between are located, the acupoint of the surface of the base sheet 21 can be prevented from directly contacting skin.

In addition, since the whitened surface sheet 22 is located on the outermost surface of the sanitary napkin 1 on the skin side, the color of the menstrual blood absorbed by the liquid absorbing layer 4 can be hidden by the surface sheet 22. It is difficult to see the color of menstrual blood while wearing it, so it can maintain a hygienic appearance.

The sanitary napkin 1 exhibiting such a function is particularly effective when the wearer behaves as follows.

When the wearer wearing this sanitary napkin 1 is in a sitting position, since the vaginal opening is pressed, the amount of excretion of acupuncture points is small. At this time, due to the pressure of the groin portion, the first wide portion 31 constituting the ridge 23A and the second wide portion 32 constituting the ridge 23B are deformed to form the base sheet 21. Will be overlaid. Therefore, even if the menstrual blood absorbed by the liquid absorbing layer 4 tries to bleed through the liquid permeation hole 21a of the base sheet 21 by pressure, this can be suppressed by the wide portions 31 and 32. Acupuncture points hardly touch the wearer's skin, and a comfortable wearing feeling can be obtained.

When the wearer suddenly rises in the sitting position, the pressure on the vaginal opening is eliminated, and a large amount of menstrual blood is rapidly given to the skin side surface of the sanitary napkin 1. At this time, since the pressure to the sanitary napkin 1 is also reduced, as shown in FIG.4 (a), each ridge 23 rises toward the skin side from the base sheet 21, and the ridge 23A Acupuncture points flow into the lateral openings 35a and 35b and the lateral openings 37a and 37b of the ridge 23B through the base sheet 21 exposed to the bottom opening 36 and the bottom opening 38. Acupuncture points are rapidly absorbed into the liquid absorbing layer 4.

In addition, in the embodiment shown in FIG.4 (a), since the front-back opening part 39a is opening in the base part of 23A of ridges, it flows in the vertical direction, and is between the ridge 23A and 23A of ridges. The acupuncture points which have entered are given to the base sheet 21 through the front and rear openings 39a. The same applies to the front and rear openings 39b formed in the raised portions 23B and the raised portions 23B. Therefore, the longitudinal and transverse diffusion of the menstrual blood can be suppressed and quickly absorbed by the liquid absorbing layer 4.

5A is a perspective view illustrating a modification of the first embodiment.

In the surface structure 20A of the sanitary napkin 1A shown in Fig. 5A, the surface sheet 22A is formed of the same resin film as in the first embodiment. The hole 22a is formed.

However, the opening area of each liquid permeation hole 22a is 0.2-10.0 mm <^2> , the opening area rate is about 1-25%, and the permeation | transmission function of the surface sheet 22A itself is the base sheet 21 It is lower than the liquid permeation function of).

Here, the liquid permeation function in the present specification refers to the artificial penetrating the sheet when the same amount of artificial menstrual blood is applied to the skin-side surfaces of the base sheet 21 and the surface sheet 22A at the same rate under the same conditions. The flow rate of the menstrual blood (the amount of permeation of artificial menstrual blood per unit area and per unit time) means more in the base sheet 21 than the surface sheet 22A.

On the other hand, when the base sheet 21 and the surface sheet 22A are the same thickness and have the same resin film, and the conditions such as hydrophilic treatment are the same, the larger the opening area of the liquid permeation hole and the higher the opening area ratio are the liquid permeation. The function becomes higher. However, the liquid permeation function does not necessarily depend on the opening area and the opening area ratio of the liquid permeation hole, and differs depending on the hydrophilic capacity and water repellency capacity of the resin film, the thickness of the resin film, the shape of the liquid permeation holes 21a, 22a, and the like. .

Liquid permeation function measured using the artificial menstrual blood when the base sheet 21 and the surface sheet 22A are not the same resin film or have different thicknesses and the shapes of the liquid permeation holes 21a and 22a are different. It is preferable to set higher in the base part sheet 21 than this surface sheet 22A.

Preferably, the flow rate through which artificial menstrual blood penetrates the base sheet 22 is 1.5 times or more, and preferably 2 times or more of the flow rate of the surface sheet 22A.

The artificial menstrual blood is obtained by adding 300 g of glycerin, 30 g of carboxymethylcellulose sodium and 40 g of sodium chloride to 1.4-liter of ion-exchanged water, and colored with red food paint or the like as necessary.

In the surface structure 20A shown in Fig. 5A, the ridge 23D formed at a constant pitch in the longitudinal direction (Y direction) on the surface sheet 22A, and the ridge formed at a constant pitch in the vertical direction ( 23E) is formed. The ridge 23D has the same shape as the ridge 23A shown in Fig. 4A, and the ridge 23E has the same shape as the ridge 23B shown in Fig. 4A. The difference is that the ridges 23A and 23B shown in Fig. 4A have front and rear openings 39a and 39b, respectively, whereas the ridges 23D and 23E shown in Fig. 5A are The surface sheet 22A which does not have the front and rear openings 39a and 39b, and instead forms the ridges 23D and 23E has only a plurality of liquid permeation holes 22a.

In the surface structure 20A shown in FIG. 5A, since the surface sheet 22A forming the ridges 23D and 23E has a liquid permeation hole 22a, the ridges 23D and 23E are formed. Acupuncture points hard to remain on the surface.

In each said embodiment, the side opening part 35a, 35b, 37a, 37b is formed in the ridge 23A, 23B, 23D, 23E of the surface sheet 22, 22A, and a menstrual blood base part is provided through this side opening. The sheet 21 can be sent quickly. Therefore, when the base sheet 21 is constituted with a high effect of preventing the liquid from the liquid absorbing layer 4 from being reversed, the surface structures 20 and 20A have good liquid permeability and the liquid is reversed. It can be said that the effect which prevents returning to is high.

In order to enhance the liquid return prevention effect of the base sheet 21, for example, as shown in Fig. 5B (cross-sectional enlarged view taken along line BB in Fig. 5A), the individual liquid penetration holes 21a are shown. It is effective to form a taper hole in which the opening area gradually narrows down toward the liquid absorbing layer 4, and forming a valve 21b protruding toward the liquid absorbing layer 4 at the lower end thereof. Alternatively, the opening area and the opening area ratio of the liquid permeation hole 21a can be made smaller within the above preferred range, or the water repellent treatment of the base sheet 21 can also increase the effect of preventing the liquid from returning. Further, the liquid permeation hole 21a having the valve 21b also increases the effect of concealing the color of the menstrual blood absorbed by the liquid absorbing layer 4.

Here, the liquid return prevention effect of the base part sheet 21 can be evaluated as follows.

5 g of artificial menstrual blood is absorbed into a pulp with a planar shape (100 × 100 mm) and a unit weight of 100 g / m ² , on which a filter paper is placed on the sheet sample and the sheet sample, and the shape of the bottom surface is 100 ×. A 100 mm square, loaded with a spindle weighing 5 kg, was given a pressure of about 4.9 kPa, and the amount of artificial menstrual blood transferred to the filter paper (the diffusion area of artificial menstrual blood in the filter paper) was lowered. High anti-feel effect.

In embodiment shown to Fig.5 (a), the following can be mentioned as combination of the surface sheet 22A and the base part sheet 21 in the case of paying attention to the said liquid return prevention effect.

(1) The liquid permeation hole 22a of the surface sheet 22A and the liquid permeation hole 21a of the base sheet 21 are combinations without the valve 21b. In this case, it is preferable that the opening area and opening area ratio of the liquid permeation holes 21a and 22a are set so that the liquid permeation function of the base sheet 21 becomes higher than the liquid permeation function of the surface sheet 22A.

This is suitable for a usage form in which pressure is hard to act on the skin-side surface of the sanitary napkin, such as when a woman wearing the sanitary napkin is often standing.

(2) The liquid permeation hole 22a of the surface sheet 22A and the liquid permeation hole 21a of the base sheet 21 are a combination provided with the valve 21b. In this case, the opening area and opening area ratio of the liquid permeation holes 21a and 22a are set so that the liquid permeation function of the base sheet 21 becomes higher than the liquid permeation function of the surface sheet 22A, and the base sheet 21 ), It is preferable that the liquid return prevention effect of the surface sheet 22A is higher.

This is suitable for a usage form in which a woman wearing this sanitary napkin is prone to pressure on the skin-side surface of the sanitary napkin, such as when there is a lot of sitting.

(3) The valve 21a is not provided in the liquid permeation hole 22a of the surface sheet 22A, and the valve 21b is provided in the liquid permeation hole 21a of the base sheet 21. . Also in this case, it is preferable that the opening area and opening area ratio of the liquid permeation holes 21a and 22a are set so that the liquid permeation function of the base sheet 21 becomes higher than the liquid permeation function of the surface sheet 22A. Moreover, even if the surface return prevention effect may be equal to 22 A of surface sheets, and the base sheet 21, or 22 A of surface sheets have a higher liquid return prevention effect than the base sheet 21. good.

This is suitable for the use form in which the function between the above (1) and (2) is required, such that the work of the woman wearing this sanitary napkin is alternately repeated between standing and sitting.

In each said embodiment, the width dimension of the wide part 31, 32 of the surface sheet 22, 22A which forms the said ridge 23 in the X direction is 0.5-10 mm, and 1-5 mm is Most preferred. Moreover, the length dimension of the ridge 23 in the longitudinal direction (Y direction) is 3-20 mm, and 8-15 mm is the most preferable. If it is in the said range, there is no possibility of giving discomfort to vaginal balls, and even if a ridge is crushed by body pressure, it becomes easy to restore to convex shape.

The space | interval of the ridges 23 arranged side by side in the horizontal direction is 0-10 mm, and 0-5 mm is the most preferable.

The opening area per one of the side openings 35a, 35b, 37a, 37b is 3 to 100 mm ² , and preferably 10 to 50 mm ² . If it is less than the above, it is difficult to guide the menstrual blood to the inside of the ridge 23, and if it exceeds the above range, the menstrual blood that has leaked to the surface of the base sheet 21 is easily adhered to the skin.

The number of the ridges 23 is preferably 50 to 800 per 100 cm ² , more preferably 100 to 500. If it is less than the above, the function which prevents the ridge part from spreading around a menstrual blood will fall, and menstrual blood will spread easily on the surface of a sanitary napkin. When more than the above, the number of the side openings 35a, 35b, 37a, 37b increases, and the acupuncture points which leaked out to the surface of the base sheet 21 easily adhere to the skin.

In the said embodiment, although each ridge 23 is formed in the same magnitude | size, the magnitude | size of each ridge may be different according to a place, and the ridge part which differs in the area when viewed from the top may be mixed. Moreover, the structure of which the area | region of a ridge | bulge becomes small gradually as the area of the ridge | bulb located in the longitudinal centerline (O-O) position becomes large, and moves away from the said longitudinal centerline (O-O).

3 shows the surface structure 20B of the sanitary napkin 1B serving as a modification of the first embodiment.

In this surface structure 20B, the ridge 23F and the ridge 23G are arranged half-pitch in the longitudinal direction (Y direction) similarly to the ridge 23A and the ridge 23B. The surface sheet 22 (or 22A) forming the ridge 23F and the ridge 23G is inclined toward the horizontal direction (X direction). As for the ridges 23F and 23G shown in FIG. 3, the side opening parts 35b and 37b open large toward the longitudinal centerline OO, and the side opening parts 35a and 37a open small toward the edge of a sanitary napkin. . Therefore, on the skin side surface of the sanitary napkin 1B, it is difficult for menstrual blood to spread toward the left and right edges of the sanitary napkin.

FIG.7 (a), (b) is a perspective view which shows the surface structure 120 of the sanitary napkin of the 2nd Embodiment of this invention, and its manufacturing process.

In 2nd Embodiment, as shown to FIG. 7 (a), the surface sheet 22 (or 22A) in which the slit 24, 25, 26, 27 was formed is used. The slit formation method of this surface sheet 22 is the same as that of 1st Embodiment shown to FIG. 6 (a).

In 2nd Embodiment, the tensile force Fx in a horizontal direction (X direction) is given to the surface sheet 22 in which the said slit 24, 25, 26, 27 was formed. By applying this tensile force Fx, the surface sheet 22 is separated by each slit 24, 25, 26, 27 and expanded in the X direction, and as a result, the surface sheet 22 is in the longitudinal direction (Y direction). ) Contraction force (fy) acts.

When the longitudinal shrinkage force fy acts and the surface sheet 22 shrinks in the longitudinal direction, the slit 24 and the first wide portion 31 sandwiched by the slit 25 are raised and deformed upward to raise the ridge ( 123A is formed, and similarly, the second wide portion 32 sandwiched between the slit 26 and the slit 27 is upwardly deformed to form a ridge 123B. Further, the first narrow portion 33 and the second narrow portion 34 deform in the lateral direction (X direction) when the surface sheet 22 is stretched in the horizontal direction, so that the narrow portions 33 and 34 are formed. It has a function of connecting the ridge 123A and the ridge 123B.

In the state where the tensile force Fx is applied to the surface sheet 22, the base sheet 21 is bonded to the base sheet 21 at portions other than the raised portions 123A and 123B. As a result, the side openings 135a and 135b through the base sheet 21 are opened in both side portions of the ridge 123A, and the side passages through the base sheet 21 in both sides of the ridge 123B. Openings 137a and 137b are formed.

Since the surface structure 120 can be formed only by giving the slit-surface sheet 22 the tensile force Fx in the horizontal direction, the manufacturing process is easy. In addition, the acupuncture points given to the surface structure 120 can enter the lateral openings 135a, 135b, 137a, and 137b to penetrate the base sheet 21 and quickly transfer to the liquid absorbing layer 4.

The step of applying the tensile force Fx in the horizontal direction to the surface sheet 22 is realized by gradually pulling in the X direction with a roller or the like when feeding the surface sheet 22 in the Y direction. Alternatively, the base sheet 21 and the surface sheet 22 shown in FIG. 7A are superimposed on the liquid absorbing layer 4 to form the vertical compression grooves 11 and 11 as shown in FIG. 1. The ridges 123A and 123B may be formed by applying the tensile force Fx in the horizontal direction to the surface sheet 22. In this case, in the region sandwiched between the longitudinal compression grooves 11 and the longitudinal compression grooves 11, when the sanitary napkin is partially enlarged in volume, the longitudinal compression grooves 11 and 11 are formed to form the surface sheet 22. ), The tensile force Fx in the transverse direction tends to act.

It is a perspective view which shows the manufacturing process of the surface structure of 3rd embodiment of this invention.

In the third embodiment, as shown in FIG. 8A, a plurality of slits 28 continuously extending to the surface sheet 22 (or 22A) without interrupting in the longitudinal direction (Y direction) are provided. Formed. The slits 28 are parallel to each other and are formed at regular intervals W3 in the horizontal direction. On the other hand, the slits 28 may be formed at different intervals in the horizontal direction.

FIG. 8B shows a molding die 140 for molding the surface sheet 22 shown in FIG. 8A. The molding frame 140 is provided with a supporting frame 141 and a pressing frame 143 facing each other. The support frame 141 is formed with a plurality of molded convex portions 142. Each shaping | molding convex part 142 is the same shape, is continuous in a horizontal direction (X direction), and is formed at fixed space | interval in a vertical direction (Y direction). The upper surface 142a of each shaping | molding convex part 142 is curved in the Y direction.

Moreover, the press frame 143 is provided with the press part 144 which fits in the minimum clearance gap between the said molding convex part 142 and the molding convex part 142 lined in the vertical direction, and this press part 144 is provided. ) Is formed continuously in the horizontal direction (X direction).

The surface sheet 22 shown in Fig. 8A is sandwiched between the supporting frame 141 and the pressing frame 143, and the surface sheet 22 is held at room temperature by the supporting frame 141 and the pressing frame 143. It pressurizes under, or presses the support frame 141 and the press frame 143 in the state heated at the temperature below the softening point of the resin film which comprises the surface sheet 22. By this process, the surface sheet | seat 22 is slit 28 and the part fitted with the slit 28 is raised, and a ridge is formed.

The surface structure is formed by joining the intermediate part (the part pressed by the said press part 144) of the ridge part of this surface sheet 22 to the surface of the base part sheet 21. As shown in FIG. The surface structure has a ridge having a shape as shown in Fig. 4A arranged at a constant pitch in the longitudinal direction, and arranged in a line in the horizontal direction.

9 (a) and 9 (b) show the surface structure 220 used in the sanitary napkin of the fourth embodiment of the present invention and a manufacturing process thereof.

In 4th Embodiment, as shown to FIG. 9 (a), the several strip | belt-shaped sheet 122 which cut | disconnected the surface sheet 22 (or 22A) by fixed width dimension W4 is used.

The strip-shaped sheet 122 and the base sheet 21 are sequentially fed in the Y direction, and at this time, the feeding speed V1 of the belt-shaped sheet 122 is higher than the feeding speed V2 of the base sheet 21. Do it quickly. And as shown in FIG.9 (b), the strip | belt-shaped sheet 122 and the base part sheet 21 are bonded together by the junction part 221 spaced apart in the vertical direction (Y direction).

By the difference of the said conveyance speed, the strip | belt-shaped sheet 122 protrudes upwards between the junction part 221 and the junction part 221 spaced in the vertical direction, and the ridges 223A and 223B are formed. In the example of FIG. 4 (b), the ridge portions 223A and the ridge portions 223B are formed such that their arrangement periods are half pitched from each other in the longitudinal direction. In addition, in the embodiment shown in FIG. 9, since the strip | belt-shaped sheet 122 is fed out substantially without space | interval in the horizontal direction, and the said ridge part 223A, 223B is formed, the skin of the base part sheet 21 is carried out. The ridges 223A and 223B exist on the side surface without substantially leaving a gap.

Therefore, the menstrual blood which has returned from the liquid absorbing layer 4 to the surface of the base sheet 21 can be covered with the band-shaped sheet 122, thereby preventing the menstrual blood from adhering to the skin, and the liquid absorbing layer 4 It can exert the effect of hiding the color of the menstrual blood absorbed in.

In addition, the following method can also be implemented as a manufacturing process of the surface structure 220 shown to FIG. 9 (b).

As the base sheet 21, one having elasticity in the longitudinal direction (Y direction) is used. For example, the base sheet 21 is subjected to a corrugation process, and at the same time, a partially bonded nonwoven fabric such as an air-through nonwoven fabric having liquid permeability and elasticity is used on the wear-side surface of the base sheet 21.

In the state where the elastic base sheet 21 is stretched in the longitudinal direction, the band-like sheet 122 is bonded to the skin-side surface at intervals in the vertical direction to form the joint portion 221. Thereafter, the tension applied to the base sheet 21 is released, and the base sheet 21 is contracted in the longitudinal direction, whereby the raised portions 223A and 223B shown in Fig. 9B can be formed. . In addition, also in the said 1st-3rd embodiment, the modified example thereof, and embodiment described after this, in the same way, a ridge | bulb is formed by giving tension | tensile_strength to the base part sheet 21, and contracting | contracting. It is possible.

(A), (b), (c) is a partial perspective view which shows another embodiment of the surface structure which can be manufactured by the manufacturing process shown in FIG. 9, respectively.

In the surface structure 220A of the fifth embodiment shown in FIG. 10A, the base sheet 321 is formed of a liquid-permeable nonwoven fabric. This nonwoven fabric is made of a spunlace nonwoven fabric mainly composed of hydrophilic fibers such as pulp and rayon, an airthrough nonwoven fabric made of hydrophilic heat-sealed composite synthetic fibers with hot air or a spunbond nonwoven fabric formed of hydrophilic synthetic resin fibers. Such as forming a large number of permeation holes. Or like the said each embodiment, the base part sheet 21 of the resin film in which many liquid permeation holes were formed can also be used.

By the same manufacturing process as shown in FIG. 9, the strip-shaped sheet 122 is partially bonded to the base sheet 321 at intervals in the vertical direction to form a junction portion 221, and the junction portion 221 is formed. And the junction part 221, the strip | belt-shaped sheet 122 is raised upward and ridge | bulb part 233A, 223B is formed.

In the surface structure 220A shown in Fig. 10A, the ridges 223A and the ridges 223B are arranged at intervals in the horizontal direction, but in the gap between the ridges 223A and the ridges 223B. The coating resin film 124 is provided, and this coating resin film 124 is stuck to the skin side surface of the base sheet 321.

The coating resin film 124 does not substantially penetrate the liquid like the surface sheet 22, or has a liquid permeation hole 22a having a relatively small opening area, such as the surface sheet 22A. The liquid permeation function is inferior to that of the sub sheet 321. In any case, the coating resin film 124 is whitened including an inorganic filler.

When acupuncture points are given to the surface structure 220A, the acupuncture points enter the ridges 223A and 223B, penetrate the base sheet 321, and are absorbed by the liquid absorbing layer. In addition, since the surface of the base sheet 321 is covered with the ridges 223A and 223B and the coating resin film 124, the menstrual blood absorbed by the liquid absorbing layer 4 is hard to adhere to the skin, and the ridges ( The color of the menstrual blood can be hidden by the 223A and 223B and the coating resin film 124.

FIG.10 (b) has shown the surface structure 220B used as a modification of 5th Embodiment. In this surface structure 220A, the base sheet 321 is formed of an aggregate of strip-shaped films, and a liquid permeation hole is formed in each strip-shaped film. And the strip | belt-shaped sheet 122 is partially bonded to the skin side surface of the base part sheet 321, and the protruding parts 223A and 223B are formed.

The ridges 223A and the ridges 223B are arranged at intervals in the horizontal direction (X direction). Preferably, the base sheet 321A has one or two stacked sheets of the strip-shaped sheet immediately below the ridges 223A and 223B, and is located between the ridges 223A and the ridges 223B. In this case, the number of laminated sheets is two or more sheets, and the number of laminated sheets is larger than immediately below the ridges 223A and 223B. Accordingly, the base sheet 321A is configured to easily penetrate the liquid just below the ridges 223A and 223B, and is inferior in the liquid permeation function between the ridges 223A and the ridges 223B. have.

In this surface structure 220B, a given menstrual blood moves to the inside of the ridges 223A and 223B, passes through the liquid permeation hole of the strip-shaped sheet having a small number of laminated sheets, and is given to the liquid absorbing layer 4. The skin-side surface of the base sheet 321A is covered with the raised portions 223A and 223B, and the liquid permeation function is reduced in the portion not covered with the raised portions 223A and 223B, so that the liquid absorption layer 4 The acupuncture points absorbed by the erythema are less likely to bleed to the outermost surface, making it difficult to contact the skin. In addition, it is possible to hide the color of the menstrual blood absorbed in the liquid absorbing layer (4).

FIG.10 (c) is a partial perspective view which shows the surface structure 220C of the modification of 5th Embodiment.

The base sheet 421 of the surface structure 220C is formed of a resin film 422 whose skin side surface has formed a plurality of liquid permeation holes, and is formed of hydrophilic fibers or hydrophilic synthetic resin fibers on the wear side surface. The nonwoven fabric 423 is overlapped and bonded. The strip | belt-shaped sheet 122 is partially bonded on the base sheet 421, and the ridges 223A and 223B are formed.

The base sheet 421 is formed with a recess 424 in a portion located directly below the ridges 223A and 223B. The raised portions 223A and the raised portions 223B are arranged at intervals in the horizontal direction (X direction), and a recess is formed in the base sheet 421 between the raised portions 223A and the raised portions 223B. It is not.

When the menstrual blood is given to the surface structure 220C, the menstrual blood enters the inside of the ridges 223A and 223B through the lateral openings opened to the lateral sides of the ridges 223A and 223B, and the menstrual blood reaches the recess 424. It is then given to the liquid absorbing layer 4 through the liquid permeation hole of the base sheet 421.

In the concave portion 424, the liquid can be stopped. Even if a large amount of acupuncture points are given in a short time, the transfusion can be prevented by temporarily stopping the acupuncture points in the concave part 424. . Moreover, since the strip | belt-shaped sheet 122 which forms ridge | bulb part 223A, 223B exists in the recessed part 424, the menstrual blood in the recessed part 424 is hard to adhere to skin.

In each of the above embodiments, each of the ridges can be raised or the height of the ridges can be increased by using the sanitary napkin being deformed into a curved shape. When the sanitary napkin is mounted on the groin area, the sanitary napkin is deformed so that the skin side surface is recessed, so that the ridge can be formed at the deformed place, or the height of the ridge can be increased.

Alternatively, a leakage preventing wall exerting elastic contraction force in the longitudinal direction on the skin side surface of the sanitary napkin is deformed so that the skin side surface is recessed by the elastic contraction force of the leakage preventing wall, thereby raising or raising the ridge. You may increase the height of the part.

In other words, as the sanitary napkin is deformed, the elevation of the ridge of the ridge increases, thereby preventing the spread of the menstrual blood in the portion, thereby making the menstrual blood preventive effect more effective.

11 is a perspective view illustrating a surface structure 520 of a sixth embodiment of the present invention.

As the surface structure 520, a surface sheet 22A having a liquid permeation hole 22a shown in Fig. 5A or 5B is used. Slit is not formed in this surface sheet 22A, it is supplied to the shaping | molding die 40 shown in FIG.6 (b), and it presses in the support frame 41 and the pressing die 43 as it is at normal temperature. Or you may overheat and press to the temperature below the softening point of a resin film. The raised convex portions 42 of the support frame 41 form ridges 523A and 523B in the surface sheet 22A, at which time the liquid permeation hole 22a of the surface sheet 22A is extended and opened. The opening part 535a which opens or extends the permeation | transmission hole 22a and breaks in the surface sheet 22A around it, and opens to the ridge part 523A toward both directions of a X direction. Is formed, and the side opening part 537a is formed in the ridge 523B.

In this embodiment, the opening area of the side opening parts 535a and 537a becomes slightly smaller than the said each embodiment. Therefore, the acupuncture points of the base sheet 21 located under the ridges 523A and 523B are difficult to adhere to the skin because the menstrual blood which has moved to the inside of the ridges 523A and 523B is hard to come out. It is easy to be absorbed by the liquid absorbing layer 4 through 21a).

In addition, this invention is not limited to each said embodiment, A various change is possible. (A), (b), (c) is a perspective view which shows other embodiment.

The surface structure 520A shown in FIG. 12 (a) is formed by pressing a surface sheet 22A having a plurality of liquid permeation holes 22a into a molding die to form almost cubic ridges 523C and 523D. At this time, the liquid permeation hole 22a is enlarged and opened, or the resin film around the liquid permeation hole 22a is broken to form side openings 535a and 537a. The ridges 523C and the ridges 523D are arranged side by side in the horizontal direction (X direction). In addition, in embodiment shown to FIG. 4 or FIG. 5, you may shape each ridge part in a cube shape as shown to FIG. 12 (a).

In the surface structure 520B shown in Fig. 12B, a dome-shaped ridge 523E is formed by pressing a surface sheet 22A having a plurality of liquid permeation holes 22a into a molding die. The liquid permeation hole 22a is enlarged and opened, or the resin film around the liquid permeation hole 22a is broken, and a plurality of side openings 536 are formed around the base portion of the dome shape.

As shown in Figs. 12A and 12B, the shape of the ridge can be arbitrarily changed. In addition, since these surface structures 520A and 520B cover the base sheet 21 other than the ridges, the acupuncture points oozing out of the base sheet 21 are less likely to adhere to the skin, and the liquid absorbing layer 4 The color of the absorbed menstrual blood can be hidden by the surface sheet 22A.

The surface structure 620 shown in FIG. 12 (c) is a modification of the embodiment shown in FIGS. 8, 9 and 10 (a), (b) and (c). In the surface structure 620, both side edges of the strip-shaped sheet 122A forming the raised portions 223C and 223D are formed in a jagged shape 123 instead of a straight line.

In addition, in this invention, in each said embodiment, you may form a base part sheet and a surface sheet only by a resin film, and a base part sheet and a surface sheet are made to the resin film which faces the skin side surface, and the wear side surface. It is possible to form an overlapping hydrophilic nonwoven

In the present invention, since the surface structure is formed from a liquid permeable base sheet and a surface sheet having at least the skin side surface formed of a resin film, and the ridge is formed from the surface sheet, the menstrual blood is formed through the lateral opening of the ridge. It is given to the sub sheet, and is made to penetrate the base sheet and be easily absorbed by the liquid absorbing layer. In addition, since there is a surface sheet formed of a resin film or containing a resin film, the acupuncture points that ooze out from the liquid absorption layer are less likely to touch the wearer's skin, and the color of the menstrual blood absorbed by the liquid absorption layer is concealed with the surface sheet. It becomes easy. Moreover, since many of the said ridges exist, the contact with skin becomes soft.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the sanitary napkin of 1st Embodiment of this invention with a wearable side surface upward.

FIG. 2 is a half cross-sectional view taken along the line II-II of the sanitary napkin shown in FIG. 1.

3 is a partial cross-sectional view showing a modification of the sanitary napkin.

FIG. 4A is an exploded perspective view showing the surface structure of the sanitary napkin of the first embodiment, and FIG. 4B is an explanatory view for explaining the shapes of the lateral openings and the bottom openings of the surface structure.

(A) is an exploded perspective view which shows the modification of the surface structure of the sanitary napkin of 1st Embodiment, (b) is sectional enlarged view by the B-B line of said (a).

6 (a) and 6 (b) are perspective views illustrating an example of a method of manufacturing the surface structure of the first embodiment of the present invention.

FIG.7 (a), (b) is a perspective view for demonstrating the surface structure of 2nd Embodiment of this invention, and its manufacturing process.

FIG.8 (a), (b) is a perspective view which shows the manufacturing process of the surface structure of 3rd Embodiment of this invention.

9 (a) and 9 (b) are perspective views showing the surface structure of the fourth embodiment of the present invention and a manufacturing step thereof.

(A), (b) (c) is a partial perspective view which shows the surface structure of the 5th Embodiment of this invention, and its modification.

It is a perspective view which shows the surface structure of 6th Embodiment of this invention.

(A), (b), (c) is a perspective view which shows the surface structure used as a modification of each embodiment.

<Description of the symbols for the main parts of the drawings>

1, 1A: sanitary napkin

3: back sheet

4: liquid absorption layer

5: side sheet

6: liquid absorption area

11: vertical compression groove

12: front horizontal compression groove

13: rear horizontal compression groove

14: central absorption area

20, 20A, 20B: Surface Structure

21: foundation sheet

21a: permeation hole

22, 22A, 22B: Surface Sheet

22a: permeation hole

23, 23A, 23B, 23D, 23E, 23F, 23G: ridge

24, 25, 26, 27, 28: slit

31: first wide part

32: second wide part

33: first narrow section

34: second narrow section

35a, 35b, 37a, 37b: lateral opening

36, 38: floor opening

39a, 39b: front and rear opening

40: forming mold

41: support frame

43: push frame

45: acupuncture points

120: surface structure

122: strip type sheet

123A, 123B: Uplift

124: coating resin film

135a, 135b, 137a, 137b: lateral opening

220, 220A: Surface Structure

221: junction

223A, 223B: Uplift

520, 520A, 520B, 620: surface structure

523A, 523B, 523C, 523D, 523E: ridge

535a, 537a, 536: side opening

Claims (15)

In the sanitary napkin having a liquid absorption layer and a surface structure covering the skin side surface of the liquid absorption layer, The surface structure has a liquid-permeable base sheet covering the skin-side surface of the liquid absorbing layer and a surface sheet located on the skin-side surface of the base sheet, wherein the surface sheet has at least a skin-side surface formed of a resin film. It is, The sanitary napkin according to claim 1, wherein the surface sheet is provided with a plurality of ridges that protrude further from the skin-side surface of the base sheet to the skin side, and a side opening that leads to the base sheet is formed at the side of the ridge. According to claim 1, The surface sheet has a plurality of slits extending in the longitudinal direction at intervals in the horizontal direction, a plurality of slits are formed at intervals in the horizontal direction and the vertical direction, located between the adjacent slits and slits in the horizontal direction A sanitary napkin in which the ridge is formed by a portion of the surface sheet, and the surface sheet and the base sheet are joined at portions other than the ridge. The transverse spacing of the slits is different depending on the location, and the wide portions sandwiched by the slits are raised to the skin side so that the raised portions are formed, and the width dimension is smaller than the wide portions sandwiched by the slits. The sanitary napkin whose narrow part is located closer to the surface of a base sheet than the top part of the said ridge. The sanitary napkin of Claim 3 in which the said wide part and the said narrow part are alternately formed in the horizontal direction. The sanitary napkin according to any one of claims 2 to 4, wherein the ridge is formed by deforming the portion sandwiched by the slit of the surface sheet toward the skin side. The slit and slit according to any one of claims 2 to 4, wherein the surface sheet is bonded to the base sheet at various places in a state in which the surface sheet is extended in the horizontal direction and contracted in the longitudinal direction. A sanitary napkin in which a portion inserted into the ridge is raised toward the skin side to form the ridge. 2. The surface sheet according to claim 1, wherein the surface sheets are a plurality of strip-shaped sheets that are separated from each other and extend continuously in the longitudinal direction, and wherein each strip-shaped sheet is joined to the base sheet at the joints spaced in the longitudinal direction. And the strip-shaped sheet portion between adjacent joint portions is raised toward the skin side from the base sheet to form the raised portion. The sanitary napkin according to claim 7, wherein the band-like sheets are arranged at intervals in the horizontal direction, and a coating resin film covering the surface of the base sheet is provided between adjacent band-shaped sheets. The sanitary napkin according to claim 7 or 8, wherein the ridge is formed by deforming the band-shaped sheet toward the skin side. The base sheet is shrunk in the longitudinal direction, and the spacing between the joints of the surface sheet and the base sheet is in the longitudinal direction according to any one of claims 2, 3, 4, 7, and 8. And the surface sheet is raised from the base sheet to form the ridge. 9. The surface sheet according to any one of claims 2, 3, 4, 7, and 8, wherein the surface sheet is raised from the base sheet when the sanitary napkin is deformed so that the skin side surface is recessed. Sanitary napkin is formed so that the ridge. The sanitary napkin according to claim 1, wherein openings are formed in the resin film forming the surface sheet, the openings are expanded, or the resin film breaks around the openings, so that the side openings are formed. The sanitary napkin according to any one of claims 1 to 4, 7 and 8, wherein the base sheet is formed of a liquid permeable sheet having a higher liquid permeability than that of the surface sheet. The sanitary napkin according to claim 13, wherein the base sheet is formed of a resin film having at least a skin-side surface having a plurality of liquid permeation holes. 15. The liquid permeation hole is formed in the resin film appearing on the skin-side surface of the surface sheet, and the opening area ratio of the liquid permeation hole of the surface sheet is lower than the opening area ratio of the liquid permeation hole of the base sheet. Sanitary napkin.