JP2005177086A - Sanitary napkin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sanitary napkin whose function of hiding the color of menstrual blood is improved by speedily absorbing much menstrual blood given at the same time and preventing returning of the menstrual blood from a liquid absorption layer. <P>SOLUTION: A surface structure 20 positioned on the surface of a liquid absorber consists of a base sheet 21 which has high liquid permeation function and a surface sheet 22 which is positioned on its surface and has low liquid permeation function. On the surface sheet, a large number of protuberance parts 23a and 23b are formed, and lateral opening parts 35a, 35b, 37a and 37b are opened on the lateral sides of the protuberance parts. The menstrual blood 45 is moved from the lateral opening parts to the insides of the protuberance parts and permeated through the liquid permeation hole 21a of the base sheet 21 to be absorbed speedily to the liquid absorption layer. It is possible to prevent diffusion of the liquid by the protuberance parts 23a and 23b and to prevent sticking of the liquid to the skin, thereby the color of the menstrual blood is hidden. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sanitary napkin in which menstrual blood is less likely to stay on the surface and can be quickly guided to an absorption layer.

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

  Menstrual blood given to the skin side surface of sanitary napkins is relatively high in viscosity, and depending on the individual differences and health conditions of the wearer, a lot of menstrual blood is given to the sanitary napkin surface sheet in a short time Sometimes.

  For example, when the surface sheet is formed of a resin film having liquid permeable holes, a large amount of menstrual blood can be obtained by increasing the opening area of each liquid permeable hole and increasing the opening area ratio of the liquid permeable holes. Can be transferred to the liquid absorbing layer in a short time. 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 liquid absorption layer returns to the skin side surface of the topsheet due to the pressure at which the sanitary napkin contacts the body. It becomes easy to adhere to the skin. Furthermore, menstrual blood absorbed in the liquid absorption layer is easily viewed through the liquid permeation hole, and the wearer is likely to be unsanitary.

  On the contrary, if 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 topsheet, and it is easy to hide the color of menstrual blood absorbed in the liquid absorption layer. However, when the liquid permeation rate of the surface sheet becomes slow and a large amount of menstrual blood having a relatively high viscosity is given in a short time, menstrual blood remains on the skin side surface of the surface sheet. The wearer is likely to feel discomfort when touching the skin.

  As described above, the surface structure of the sanitary napkin is required to have contradictory functions such as a liquid permeation function, prevention of liquid return, and concealment of menstrual blood color.

  In response to such demands, various types of surface structures that appear on the skin side surface of sanitary napkins have been proposed.

  As for the thing of the following patent documents 1, the surface material of the sanitary napkin is formed with the hydrophobic film, and many recessed parts dented toward this liquid absorption layer side are formed in this hydrophobic film. And the liquid permeation hole is formed in a part of inclination part of this recessed part. By using this surface material, menstrual blood can be freely transferred to the liquid absorption layer, liquid return from the liquid absorption layer is small, and menstrual blood absorbed in the liquid absorption layer is easy to cover. is there.

In the following Patent Document 2 to Patent Document 4, a liquid-permeable surface sheet is provided on the skin-side surface of the liquid-absorbing layer, and a bundle of continuous filaments extending in the vertical direction is formed on the skin side of the surface sheet. A large number of loop portions are formed which are fixed on the surface with a gap and are raised on the skin side by the bundle of continuous filaments positioned between the fixed portions. By providing a large number of loop-like ridges with the continuous filament, the wearer feels good contact with the body, and even if menstrual blood returns from the liquid-absorbing layer to the surface of the surface sheet, it continues to the surface. Due to the presence of filaments, menstrual blood is difficult to touch the skin directly.
JP-A-1-34365 JP 2002-65736 A JP 2002-65737 A JP 2002-69781 A

  The thing of the said patent document 1 forms many recessed parts in the surface material formed with the hydrophobic film, and guides menstrual blood into the said recessed part, and it moves menstrual blood from this recessed part to a liquid absorption layer. It is intended to make it easier. However, the opening of the surface material is provided only in the inclined portion of the recess, and the top of the recess is in a flat state having no opening. Therefore, when a relatively large amount of menstrual blood having a relatively high viscosity is given to the surface material in a short time, the inside of the concave portion is saturated with menstrual blood, and menstrual blood easily spreads around the flat portion of the apex. . Therefore, menstrual blood remains on the skin side surface of the surface material, and it is easy to contact the skin.

  Next, the thing of patent document 2 thru | or 4 becomes good in the contact feeling to skin by providing the protruding part which made the continuous filament the loop shape on the surface of a surface sheet, and the skin side of a surface sheet Even if menstrual blood remains on the surface, since continuous filaments are present, there is an effect that it is easy to prevent the menstrual blood from directly touching the skin. However, since the function for guiding menstrual blood given to the top sheet to the liquid absorption layer depends only on the liquid permeation function of the top sheet, the opening area of the liquid permeation hole of the top sheet is increased to increase the liquid. Increasing the permeation function of liquid tends to cause a problem of liquid return.

  The present invention solves the above-described conventional problems, and even when a large amount of menstrual blood is given, the menstrual blood can be quickly transferred to the liquid absorption layer, and the liquid return preventing effect and liquid An object of the present invention is to provide a sanitary napkin that has a high effect of concealing the color of menstrual blood absorbed by an absorbent layer and that also has a good touch feeling to the skin.

The present invention provides a sanitary napkin having a liquid absorbing layer and a surface structure covering the skin side surface of the liquid absorbing layer.
The surface structure has a liquid-permeable base sheet covering the skin-side surface of the liquid-absorbing layer, and a surface sheet positioned on the skin-side surface of the base sheet, and the surface sheet has at least a skin-side surface. Made of resin film,
The top sheet is formed with a large number of raised portions 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 on the side of the raised portion. It is characterized by.

  The surface structure of the sanitary napkin of the present invention is composed of a base sheet having a liquid-permeating function that covers the liquid absorber, and a surface sheet that has at least the skin side surface covering the surface of the base sheet formed of a resin film. ing. And while the side opening part has opened to the protruding part formed with the surface sheet, the said base sheet has appeared just under the protruding part. Therefore, when a large amount of menstrual blood having a relatively high viscosity is given in a short time, the menstrual blood is given to the base sheet through the side opening of the raised portion, and passes through the base sheet to pass through the liquid absorbing layer. Will be absorbed.

  Further, the bulge formed by the top sheet can be deformed toward the base sheet by the weight of the menstrual blood, so that menstrual blood is in a lateral opening of another bulge adjacent to the deformed bulge. It gets into the base sheet. Therefore, when a large amount of menstrual blood is given, this menstrual blood is promptly given to the liquid absorption layer, and can be prevented from spreading widely on the skin side surface of the sanitary napkin.

  In addition, since the surface sheet forming the raised portion is formed of a resin film at least on the skin side, even if menstrual blood permeates through the base sheet from the liquid absorbing layer and oozes back, the menstrual blood is not removed from the surface sheet. The menstrual blood is less likely to adhere directly to the skin. Furthermore, since the skin side surface of the top sheet is formed of a resin film, the color of menstrual blood absorbed by the liquid absorbing layer can be hidden by the top sheet, and the skin side surface of the sanitary napkin being worn is visually observed. You will feel hygienic when you do.

  According to the present invention, a plurality of slits extending in the vertical direction with a gap in the horizontal direction are formed in the topsheet, and the slits and slits adjacent in the horizontal direction are formed in a number of intervals in the horizontal direction and the vertical direction. The raised portion is formed by the portion of the top sheet positioned therebetween, and the top sheet and the base sheet are joined at a portion other than the raised portion.

  Further, in the present invention, the lateral spacing of the slits differs depending on the location, the wide part sandwiched between the slits is raised to the skin side to form the raised part, and the sandwiched between the slits A width detail having a width dimension smaller than that of the wide portion can be configured as being closer to the surface of the base sheet than the top of the raised portion.

  As described above, the raised portions and the side openings can be easily formed by slitting the top sheet. In particular, in the structure in which the wide portion and the wide detail partitioned by the slit are formed in the surface sheet as described above, and the raised portion is formed by the wide portion, the base sheet is covered with the wide detail in the portion other than the raised portion. Alternatively, a lower ridge is formed by the width detail. Therefore, the touch feeling to the skin on the surface becomes soft, and the whole area of the base sheet can be covered with the surface sheet, which makes it easy to prevent menstrual blood from returning from the liquid absorption layer, and is absorbed by the liquid absorption layer. It becomes easy to conceal the color of menstrual blood with a surface sheet.

  In the above, it is preferable that the wide portions and the width details are alternately formed in the lateral direction.

  For example, this invention can form the said protruding part by changing the part pinched | interposed by the said slit of the said surface sheet toward a skin side by a pressurization process or a pressurization / heating process.

  Alternatively, in a state where the surface sheet is expanded in the horizontal direction and contracted in the vertical direction, the surface sheet is bonded to the base sheet at a plurality of locations, so that the portion sandwiched between the slits is on the skin side. It is also possible that the raised portion is formed by being raised.

  In the present invention, the top sheet is a plurality of strip-like sheets that are separated from each other and extend continuously in the longitudinal direction, and the individual strip-like sheets are joined to the base sheet at joint portions spaced in the longitudinal direction. In addition, the portion of the belt-like sheet between adjacent joints can be configured to be raised from the base sheet toward the skin side to form the raised portion.

  In this case, it is preferable that the belt-like sheet has a structure in which a covering resin film is provided between the adjacent belt-like sheets so as to cover the surface of the base sheet.

  The 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 the base sheet. In the above invention, since the base sheet is covered with the coating resin film in the portion that does not have the raised portion, the return of menstrual blood from the liquid absorption layer to the surface of the base sheet can be prevented, and the liquid absorption layer has absorbed the base sheet. It becomes easy to conceal the color of menstrual blood with the surface sheet and the coating resin film.

  In the above, the raised portion can be formed by deforming the belt-like sheet toward the skin side in a pressurizing step or a pressurizing / heating step.

  Alternatively, the base sheet is contracted in the vertical direction, and the interval between the joint portions of the top sheet and the base sheet is approached in the vertical direction, whereby the top sheet is raised from the base sheet and the raised portion is It may be formed.

  Furthermore, the present invention may be such that when the sanitary napkin is deformed so that the skin side surface is depressed, the top sheet is raised from the base sheet to form the raised portion.

  That is, when the sanitary napkin is deformed to match the shape of the body, or when the sanitary napkin is provided with a leak-proof wall that exhibits elastic contraction force in the vertical direction, When the surface is deformed so as to be depressed, the top sheet may rise to form the raised portion, or the raised height of the raised portion may be increased by the deformation.

  Further, in the present invention, an opening is formed in the resin film forming the surface sheet, the opening is expanded or the resin film is broken around the opening, and the side opening is formed. It can be configured that the portion is formed.

  In this configuration, the side opening can be formed without forming a slit by using a surface sheet having an opening.

  In the present invention, it is preferable that the base sheet is formed of a liquid permeable sheet having a higher liquid permeable function than the top sheet.

  Since the base sheet is excellent in liquid permeability, menstrual blood that has passed through the side opening can be quickly transferred to the liquid absorption layer through the base sheet. In addition, the liquid permeation function of the top sheet is inferior to that of the base sheet, so that it becomes easy to prevent menstrual blood from adhering to the skin.

  In the present invention, it is preferable that at least the skin side surface of the base sheet is formed of a resin film having a large number of liquid permeable holes.

  By forming the base sheet with a resin film and forming a liquid permeation hole having a relatively large aperture area and a high aperture area ratio, menstrual blood given to the base sheet can quickly It penetrates and is absorbed by the liquid absorption layer.

  In this case, liquid-permeable holes are formed in the resin film that appears on the skin-side surface of the topsheet, and the opening area ratio of the liquid-permeable holes of the topsheet is more than the opening area ratio of the liquid-permeable holes of the base sheet Can also be low.

  However, the structure which the said protruding part formed with the said surface sheet does not have many liquid permeable holes may be sufficient.

  In the present invention, the surface structure is formed by the liquid-permeable base sheet and the surface sheet having at least the skin-side surface formed of a resin film, and the raised portion is formed by the surface sheet. It is given to the base sheet through the side opening of the raised portion, and is easily absorbed by the liquid absorbing layer through the base sheet. In addition, the presence of a surface sheet formed of a resin film or including a resin film makes it difficult for menstrual blood that has oozed back from the liquid absorption layer to touch the wearer's skin and is absorbed by the liquid absorption layer. It becomes easy to hide the color of the blood with the surface sheet. Furthermore, the presence of a large number of the raised portions makes the contact with the skin soft.

  FIG. 1 is a perspective view showing the sanitary napkin of the first embodiment of the present invention with the skin side surface facing upward, and FIG. 2 is an enlarged half sectional view of the sanitary napkin of FIG. 1 cut along the line II-II. 3 is an enlarged half sectional view of a 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 raised portion. .

  As shown in FIG. 1, the sanitary napkin 1 according to the embodiment of the present invention has a vertically long shape in which the length dimension in the vertical direction (Y direction) is longer than the width dimension in the horizontal direction (X direction), and The shape is symmetrical with respect to the direction center line OO.

  As for the external shape of the sanitary napkin 1, the front edge part 1a directed to the wearer's abdomen and the rear edge part 1b directed to the buttocks are both convex curves. The sanitary napkin 1 has wings 2 and 2 extending to the left and right sides, and in front of the wings 2 and 2, a front side edge 1 c having a curved shape toward the left and right outer sides. 1c is formed, and rearward edge portions 1d and 1d having a curved shape are formed on the left and right sides behind the wing portions 2 and 2, respectively.

  As shown in the sectional view of FIG. 2, the structure of the sanitary napkin 1 includes a liquid-blocking back sheet 3 that covers the clothing-side surface of the liquid-absorbing layer 4 and a surface structure that covers the skin-side surface of the liquid-absorbing layer 4. 20. The surface structure 20 includes a base sheet 21 that covers the skin side surface of the liquid absorbing layer 4 and a surface sheet 22 that is positioned on the skin side surface of the base sheet 21. The peripheral edge portion of the liquid absorbing layer 4 is indicated by a broken line in FIG. 1, and the liquid absorbing layer 4 is present in almost all portions of the sanitary napkin 1 except the wing portion 2.

  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 sandwiched between the back sheet 3 and the side sheet 5. Thus, the back sheet 3, the base sheet 21, and the side sheets 5 are bonded to each other. The opposing edge portions 5a of the respective side sheets 5 are located on both the left and right side portions of the liquid absorbing layer 4, and the portion sandwiched between the opposing edge portion 5a and the opposing edge portion 5a is the liquid absorbing region 6. It has become.

  The wing portions 2 and 2 are formed by overlapping and bonding the back sheet 3 and the side sheets 5 and 5. On the opposite side of the liquid absorption region 6, pressure-sensitive adhesive layers 7, 7 are formed on the surface of the back sheet 4, and the pressure-sensitive adhesive layer 8 is provided on the skin-side surface of each wing portion 2. It has been.

  The back sheet 4 is formed of a resin film such as a liquid blocking 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 an airlaid method is fixed with a binder. The side sheet 5 is liquid-blocking, for example, a melt blown nonwoven fabric, a spunbond nonwoven fabric, a spunbond nonwoven fabric / spun fiber formed of polyethylene (PE) resin fiber, polypropylene (PP) resin fiber, polyethylene terephthalate (PET) resin fiber, etc. It is formed of a laminated nonwoven fabric in which a meltblown nonwoven fabric / spunbond nonwoven fabric is laminated.

  As shown in FIG. 1, in the liquid absorption region 6, a compression groove is formed in which the liquid absorption layer 4, the base sheet 21, and the surface sheet 21 are compressed together. This compression groove includes a pair of longitudinal compression grooves 11 and 11 extending in the longitudinal direction, a front lateral compression groove 12 formed in a convex pattern with both longitudinal compression grooves 11 and 11 connected forward, and both The vertical compression grooves 11 and 11 are connected to each other, and the rear horizontal compression grooves 13 are formed in a convex pattern toward the rear.

  In the central absorbent region 14 surrounded by the longitudinal compression grooves 11, 11, the front lateral compression groove 12 and the rear lateral compression groove 13, a large number of raised portions 23 are formed by the topsheet 22.

  FIG. 4A shows an enlarged view of the structure of the surface structure 20 including the surface sheet 22 and the base sheet 21 that form the raised portion 23.

  In the sanitary napkin 1 of the first embodiment, the base sheet 21 and the top sheet 22 are both formed of a resin film.

The resin film that forms the base sheet 21 is, for example, a PE resin film or a PP resin film, and is whitened by mixing with an inorganic filler such as titanium oxide, barium sulfide, or calcium carbonate. In the base sheet 21, a large number of liquid permeation holes 21a are regularly arranged to enhance the liquid permeation function. Open area of the individual liquid passage holes 21a (actual opening area) 0.2～30Mm ² relatively large, preferably 1 to 30 mm ^2. Further, the area ratio of the liquid permeable holes 21 a is about 5 to 40% in the central absorption region 14.

  Further, the base sheet 21 is coated with a surfactant on the surface so that it is easy to attract menstrual blood to the surface and transfer to the liquid absorbing layer 4 through the liquid permeation hole 21a, or a surfactant inside the film. Those that have been subjected to a hydrophilic treatment by kneading are preferably used.

  The top 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 obtained by blending the above resins. A material that does not have a liquid permeation hole at the time of the dough before forming the raised portion 23 and that hardly exhibits a liquid permeation function is used.

  In the embodiment shown in FIG. 1, a raised portion 23 is formed in a portion other than the central absorption region 14 surrounded by the vertical compression grooves 11, 11, the front horizontal compression groove 12 and the rear horizontal compression groove 13. Therefore, it is preferable that a liquid permeable hole is formed in the surface sheet 22 in a region where the raised portion 23 is not formed. However, this liquid permeable hole has an opening area smaller than the liquid permeable hole 21a of the base sheet 21, and the opening area ratio is low.

  As shown in FIG. 4 (A), the thickness of the resin film is preferably 10 to 150 μm, and more preferably 15 to 80 μm so that the raised portion 23 is easily deformed freely by the self-weight of menstrual blood.

  The resin film forming the top sheet 22 is whitened by mixing the inorganic filler. Further, in order to make menstrual blood rapidly move toward the base sheet 21, the top sheet 22 is preferably water-repellent on the surface. On the other hand, for the purpose of migrating menstrual blood to the base sheet 21, it is hydrophilic. It may be processed.

  The raised portion 23 of the topsheet 22 can be formed, for example, by the steps shown in FIGS.

  As described above, in the first embodiment, the resin film itself that becomes the top sheet 22 does not have a liquid permeation function, but as illustrated in FIG. 6A, the resin film itself is spaced in the longitudinal direction (Y) direction. The slits 24 are arranged linearly with a gap between them, and the slits 25 are also arranged linearly at intervals in the vertical direction. The individual slits 24 and the slits 25 have the same length in the vertical direction and are parallel to each other. Further, they are formed in the vertical direction with the same phase and the same pitch. The interval in the horizontal direction (X direction) between the slit 24 and the slit 25 is W1.

  The slit 26 and the slit 27 are the same in length (Y direction) as the slit 24 and the slit 25, respectively. The slit 26 and the slit 27 are parallel to each other, and are linearly arranged at the same phase and the same pitch in the vertical direction. The interval between the slit 26 and the slit 27 in the X direction is W1 as described above. However, the slit 26 and the slit 27 are shifted from the slit 24 and the slit 25 in the longitudinal direction (Y direction) by a half cycle.

  The interval in the horizontal direction (X direction) between the slit 25 and the slit 26 and the interval in the horizontal direction (X direction) between the slit 27 and the slit 24 are both W2, and the interval W2 is sufficiently smaller than the interval W1. ing.

  As shown in FIG. 6A, a pair of slits 24 and 25 and a pair of slits 26 and 27 are alternately arranged in the lateral direction (X direction). The portion sandwiched between the slit 24 and the slit 25 is the first wide portion 31 having the width dimension W1, and the portion sandwiched between the slit 26 and the slit 27 is the second wide portion 32 having the width dimension W1. A portion sandwiched between the slit 25 and the slit 26 is a first width detail 33 having a width dimension W2, and a portion sandwiched between the slit 27 and the slit 24 is a second width detail 34 having a width dimension W2.

  FIG. 6B shows a molding die 40 that molds the topsheet 22 in which a plurality of slits are formed as described above. The molding die 40 is provided with a receiving die 41 and a pressing die 43 facing each other. The receiving mold 41 is formed with a large number of forming convex portions 42. Each of the molding convex portions 42 has the same shape and the same dimensions, the upper surface 42a is curved in the Y direction, and both side surfaces 42b and 42b are vertical planes.

  The individual molding convex portions 42 are arranged so as to be opposed to the first wide portion 31 and the second wide portion 32 of the topsheet 22. Further, the first width detail 33 and the second width detail 34 are opposed to each other between the molding convex portion 42 and the molding convex portion 42 adjacent to each other in the X direction.

  The pressing die 43 is provided with a pressing portion 44 that fits with a minimum gap between the forming convex portion 42 and the forming convex portion 42 arranged in the vertical direction.

  The top sheet 22 formed with a plurality of slits is sandwiched between a receiving mold 41 and a pressing mold 43, and the top sheet 22 is pressed at room temperature with the receiving mold 41 and the pressing mold 43, or By pressing the pressing die 43 in a state where it is heated to a temperature equal to or lower than the softening point of the resin film constituting the topsheet 22, a plurality of raised portions 23 are formed on the topsheet 22 as shown in FIG. It is formed.

  In this embodiment, the shape and dimensions of all the raised portions 23 are the same, but the first wide portion 31 sandwiched between the slit 24 and the slit 25 is pressed by the molding convex portion 42 and molded. A protruding portion formed by pressing the second wide portion 32 sandwiched between the slit 26 and the slit 27 by the molding convex portion 42 is indicated by reference symbol 23B.

  Since the set of the slits 24 and 25 and the set of the slits 26 and 27 are formed so as to be shifted by a half cycle in the Y direction, the raised portion 23A and the raised portion 23B are displaced by a half pitch in the Y direction. Formed. In addition, the raised portions 23A and the raised portions 23B are alternately arranged in the lateral direction (X direction).

  4A, the structure of the raised portion 23A will be described. In the raised portion 23A, the first wide portion 31 separated by the slit 24 and the slit 25 is formed on the upper surface 42a of the molding convex portion 42. It has a raised shape that is curved according to the shape.

  Below, the edge part of the surface sheet formed by isolate | separating with a slit is called a separation edge part. One separation edge 24b formed by separating the topsheet 22 from each other by the slit 24 becomes an edge of the first wide portion 31, and this separation edge 24b is located above the other separation edge 24a. The side opening 35a that opens greatly to the side of the raised portion 23A is formed.

  Similarly, one separation edge 25b separated from each other by the slit 25 becomes an edge of the first wide portion 31, and the separation edge 25b is greatly separated upward from the other separation edge 25a. A side opening 35b is formed that opens largely to the side of 23A. In addition, a bottom opening 36 is formed between the separation edge 24a and the separation edge 25a immediately below the first wide portion 31 forming the raised portion 23A. The base sheet 21 located at is exposed.

  FIG. 4B shows the shape of the side openings 35a and 35b projected in the X direction. In FIG. 4B, the bottom opening 36 is hatched.

  Similarly, also in the raised portion 23B, one separation edge portion 26b separated by the slit 26 is greatly separated upward from the other separation edge portion 26a, and a side opening 37a is formed and separated by the slit 27. A side opening 37b is formed by the separation edge 27b being greatly separated upward from the separation edge 27a. Further, a bottom opening 38 that exposes the base sheet 21 is opened between the separation edge 26a and the separation edge 27a immediately below the second wide portion 32 that forms the raised portion 23B.

  As shown in FIG. 4A, in each raised portion 23A, front and rear openings that open in the Y direction at both ends in the Y direction of the first wide portion 31, that is, at the rising base from the base sheet 21 39a is formed. Similarly, front and rear openings 39b that open in the Y direction are also formed in the individual raised portions 23B at both end portions in the Y direction of the second wide portion 32, that is, at the rising base portion from the base sheet 21. The opening areas of the individual front and rear openings 39a and 39b are smaller than the opening areas of the individual side openings 35a, 35b, 37a, and 37b.

  The first width detail 33 between the slit 25 and the slit 26 is not greatly raised upward like the raised portion 23, and is positioned below the top of the raised portion 23 to cover the surface of the base sheet 21. Covering. Similarly, the second width detail 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 raised portion 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 raised portions 23 (23A, 23B).

Next, the menstrual blood absorption function of the sanitary napkin 1 according to the first embodiment will be described.
In the sanitary napkin 1, as shown in FIG. 2, the skin side surface of the liquid absorbing layer 4 is covered with a base sheet 21 having a high liquid permeation function, and the skin side surface is further covered by the base sheet 21. The surface sheet 22 having a low liquid absorption function itself (which does not exhibit the liquid permeation function in the first embodiment) is overlaid, and in the central absorption region 14, a large number of loop shapes are formed by the surface sheet 22. The raised portion 23 (23A, 23B) is formed.

  When menstrual blood is given to the central absorption region 14, the menstrual blood passes through the side openings 35a and 35b that are greatly open toward the X side in the ridge 23A and enters the bottom opening 36 directly below the ridge 23A. It is given to the exposed base sheet 21. Similarly, menstrual blood is given to the base sheet 21 exposed to the bottom opening 38 directly below the bulge 23B through the side openings 37a and 37b that are largely open in the X direction at the bulge 23B.

  Since the base sheet 21 has the liquid permeation holes 21a having a relatively large opening area formed with a high opening area ratio, the menstrual blood given to the bottom opening parts 36 and 38 is the liquid permeation hole 21a of the base sheet 21. Is quickly absorbed and absorbed by the liquid absorption layer 4 below.

  FIG. 4A schematically shows a state where menstrual blood 45 having a relatively high viscosity is given to the central absorption region 14. When menstrual blood 45 having a relatively high viscosity is applied, the first wide portion 31 forming the raised portion 23 </ b> A is deformed into a concave shape toward the base sheet 21 by the weight of menstrual blood 45. Immediately thereafter, menstrual blood 45 flows into the side opening 37a of the raised portion 23B located beside the deformed raised portion 23A, and is immediately given to the base sheet 21 located in the bottom opening 38 just below the raised portion 23B. The liquid absorption layer 4 is absorbed through the liquid permeation hole 21a.

  Therefore, even when a large amount of menstrual blood is given in a short time, menstrual blood is given to the bottom openings 36 and 38 through the side openings 35a, 35b, 37a and 37b, and the bottom opening 36 is provided. , 38 is quickly absorbed by the liquid absorbing layer 4 through the base sheet 21 exposed to the surface.

  Further, even if pressure is applied to the sanitary napkin and menstrual blood absorbed in the liquid absorbing layer 4 permeates the liquid-permeable hole 21a of the base sheet 21 and oozes out to the skin side surface of the base sheet 21, the base On the surface of the sheet 21, a first wide portion 31 that forms a raised portion 23A, a second wide portion 23B that forms a raised portion 23B, and a first width detail 33 between the raised portions 23A and 23B, Since the second width detail 34 is located, menstrual blood on the surface of the base sheet 21 can be prevented from coming into direct contact with the skin.

  Further, since the whitened surface sheet 22 is located on the outermost surface of the sanitary napkin 1 on the skin side, the color of menstrual blood absorbed by the liquid absorbing layer 4 can be hidden by the surface sheet 22. During the wearing, the color of menstrual blood becomes difficult to see and the hygienic appearance can be maintained.

  The sanitary napkin 1 that exhibits such a function is particularly effective in the following behavior of the wearer.

  When the wearer who wears this sanitary napkin 1 is in the sitting posture, the vaginal opening is pressed, so the amount of menstrual blood excreted is small. At this time, the first wide portion 31 constituting the raised portion 23 </ b> A and the second wide portion 32 constituting the raised portion 23 </ b> B are deformed and overlapped with the base sheet 21 due to the pressure in the crotch portion. Therefore, even if menstrual blood absorbed in the liquid absorbing layer 4 oozes out through the liquid permeable hole 21a of the base sheet 21 due to pressure, this can be suppressed by the wide portions 31 and 32, and the wearer's skin can be prevented. There is little menstrual blood contact, and a comfortable wearing feeling can be obtained.

  When the wearer suddenly stands up from the sitting posture, there is no pressure on the vaginal opening, and a large amount of menstrual blood is rapidly applied to the skin side surface of the sanitary napkin 1. At this time, in order to reduce the pressure on the sanitary napkin 1, as shown in FIG. 4 (A), each raised portion 23 rises from the base sheet 21 toward the skin side, and the lateral opening of the raised portion 23A. The menstrual blood flows into the side openings 37a and 37b of the portions 35a and 35b and the raised portion 23B, and the menstrual blood enters the liquid absorbing layer 4 through the base sheet 21 exposed at the bottom opening 36 and the bottom opening 38. It is absorbed quickly.

  Furthermore, in the embodiment shown in FIG. 4 (A), the front and rear opening 39a is open at the base of the raised portion 23A, so that it flows in the vertical direction and enters between the raised portion 23A and the raised portion 23A. Blood is given to the base sheet 21 through the front and rear opening 39a. The same applies to the raised portion 23B and the front-rear opening 39b formed in the raised portion 23B. Accordingly, the longitudinal and lateral diffusion of menstrual blood can be suppressed, and the menstrual blood is quickly absorbed by the liquid absorbing layer 4.

FIG. 5A is a perspective view showing 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 that of the first embodiment. A transmission hole 22a is formed.

However, the opening area of each liquid permeation hole 22a is 0.2 to 10.0 mm ² , the area ratio of the opening is about 1 to 25%, and the liquid permeation function of the top sheet 22A itself is the base sheet. The liquid permeation function of 21 is lower.

  Here, the liquid permeation function in this specification refers to an artificial material that permeates the sheet when the same amount of artificial menstrual blood is given to the skin of the base sheet 21 and the top sheet 22A under the same conditions at the same speed. It means that the flow rate of menstrual blood (permeated amount of artificial menstrual blood per unit area and per unit time) is larger in the base sheet 21 than in the top sheet 22A.

  When the base sheet 21 and the top sheet 22A are the same thickness and the same resin film, and the conditions such as hydrophilic treatment are the same, the liquid permeation function is larger when the permeation area of the liquid permeation hole is larger and the perforation area ratio is higher. Becomes higher. However, the liquid permeation function does not necessarily depend on the aperture area and the aperture area ratio of the liquid permeation holes, and the hydrophilic ability and water repellency ability of the resin film, the thickness of the resin film, and the shapes of the liquid permeation holes 21a and 22a It depends on such things.

  When the base sheet 21 and the top sheet 22A are not the same resin film or have different thicknesses and the liquid permeation holes 21a and 22a have different shapes, the liquid permeation function measured using the artificial menstrual blood is The base sheet 21 is preferably set higher than the top sheet 22A.

  Preferably, the flow rate of the artificial menstrual blood passing through the base sheet 22 is 1.5 times or more, preferably 2 times or more, the flow rate of the top sheet 22A.

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

  In the surface structure 20A shown in FIG. 5 (A), the ridges 23D formed on the surface sheet 22A at a constant pitch in the vertical direction (Y direction) and the ridges formed on the surface sheet 22A at the same pitch in the vertical direction. 23E. The raised portion 23D has the same shape as the raised portion 23A shown in FIG. 4 (A), and the raised portion 23E has the same shape as the raised portion 23B shown in FIG. 4 (A). The difference is that the raised portions 23A and 23B shown in FIG. 4A have front and rear openings 39a and 39b, respectively, whereas the raised portions 23D and 23E shown in FIG. The top sheet 22A that does not have the openings 39a and 39b and forms the raised portions 23D and 23E instead has only a number of liquid-permeable holes 22a.

  In the surface structure 20A shown in FIG. 5A, the surface sheet 22A forming the raised portions 23D and 23E has the liquid permeable holes 22a, so that menstrual blood remains on the surfaces of the raised portions 23D and 23E. It becomes difficult.

  In each of the above-described embodiments, side openings 35a, 35b, 37a, and 37b are formed in the raised portions 23A, 23B, 23D, and 23E of the topsheets 22 and 22A, and menstrual blood is supplied to the base sheet through the side openings. 21 can be sent quickly. Therefore, when the base sheet 21 is configured to have a high effect of preventing the liquid from returning from the liquid absorption layer 4, the surface structures 20, 20A have a high liquid permeability and a high effect of preventing the liquid from returning. it can.

  In order to increase the effect of preventing the liquid from returning from the base sheet 21, for example, as shown in FIG. 5B (an enlarged cross-sectional view taken along line BB in FIG. 5A), the individual liquid passage holes 21a are formed. It is effective to form a tapered hole whose opening area gradually narrows toward the liquid absorption layer 4 and to form a valve 21b protruding toward the liquid absorption layer 4 at the lower end thereof. Alternatively, the liquid return preventing effect can be enhanced by reducing the opening area and the opening area ratio of the liquid permeation hole 21a within the above-mentioned preferable range, or by subjecting the base sheet 21 to water repellent treatment. In addition, the liquid permeation hole 21a having the valve 21b also increases the effect of concealing the color of menstrual blood absorbed by the liquid absorption layer 4.

Here, the liquid return preventing effect of the base sheet 21 can be evaluated as follows.
5 g of artificial menstrual blood is absorbed into a pulp having a square shape (100 × 100 mm) and a basis weight of 100 g / m ² , a filter paper is placed on the sheet sample and the sheet sample, and the shape of the bottom surface is 100 × 100 mm. The pressure of about 4.9 kPa is applied with a weight of 5 kg on the weight, and the amount of artificial menstrual blood transferred to the filter paper at that time (the diffusion area of artificial blood donation on the filter paper) decreases as the liquid returns. High prevention effect.

  In the embodiment shown in FIG. 5 (A), the following may be possible combinations of the top sheet 22A and the base sheet 21 when paying attention to the liquid return preventing effect.

  (1) A combination in which the liquid permeable hole 22a of the top sheet 22A and the liquid permeable hole 21a of the base sheet 21 are not provided with the valve 21b. In this case, it is preferable that the opening area and the opening area ratio of the liquid permeable holes 21a and 22a are set so that the liquid permeable function of the base sheet 21 is higher than the liquid permeable function of the top sheet 22A.

  This is suitable for a usage form in which pressure is not easily applied to the skin side surface of the sanitary napkin, for example, a woman wearing this sanitary napkin has a lot of standing work.

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

  This is suitable for a usage form in which pressure tends to act on the skin side surface of the sanitary napkin, for example, a woman wearing this sanitary napkin has a lot of sitting work.

  (3) A combination in which the liquid permeation hole 22a of the top sheet 22A is not provided with the valve 21a, and the liquid permeation hole 21a of the base sheet 21 is provided with the valve 21b. Also in this case, it is preferable that the opening area and the opening area ratio of the liquid permeable holes 21a and 22a are set so that the liquid permeable function of the base sheet 21 is higher than the liquid permeable function of the top sheet 22A. Further, the liquid return preventing effect may be equivalent to that of the top sheet 22 </ b> A and the base sheet 21, or the top sheet 22 </ b> A may have a higher liquid return preventing effect than the base sheet 21. .

  This is suitable for a usage form in which an intermediate function between the above (1) and (2) is required such that a woman wearing this sanitary napkin repeats standing work and sitting work alternately.

In each said embodiment, the width dimension of the X direction of the wide parts 31 and 32 of the surface sheets 22 and 22A which form the said protruding part 23 is 0.5-10 mm, and 1-5 mm is the most preferable. Moreover, the length dimension of the vertical direction (Y direction) of the protruding part 23 is 3-20 mm, and 8-15 mm is the most preferable. If it is within the above range, there is no possibility of giving a strange feeling to the vaginal opening, and even if the raised portion is crushed by body pressure, it becomes easy to restore the convex shape.
The interval between the raised portions 23 arranged in the lateral direction is 0 to 10 mm, and most preferably 0 to 5 mm.

The opening area per one of the side openings 35a, 35b, 37a, 37b is 3 to 100 mm ² , preferably 10 to 50 mm ² . If it is less than the above, it becomes difficult to guide menstrual blood to the inside of the raised portion 23, and if it exceeds the range, menstrual blood that has oozed out on the surface of the base sheet 21 tends to adhere to the skin.

The number of the raised portions 23 is preferably 50 to 800 per 100 cm ² , more preferably 100 to 500. If it is less than the above, the function of the raised portion to prevent the spread of menstrual blood is reduced, and menstrual blood easily spreads on the surface of the sanitary napkin. If it is more than the above, the number of the side openings 35a, 35b, 37a, 37b becomes too large, and menstrual blood that has oozed out on the surface of the base sheet 21 tends to adhere to the skin.

  In the embodiment described above, the individual ridges 23 are formed in the same size, but the size of the individual ridges may differ depending on the location, and there is a difference in area when viewed from above. Raised portions may be mixed. Further, the area of the raised portion located at the longitudinal center line OO may be large, and the area of the raised portion may be reduced stepwise as the distance from the longitudinal center line OO increases.

  FIG. 3 shows a surface structure 20B of a sanitary napkin 1B that is a modification of the first embodiment.

  In the surface structure 20B, the raised portions 23F and the raised portions 23G are arranged with a half-pitch shift in the vertical direction (Y direction), similarly to the raised portions 23A and the raised portions 23B. And the surface sheet 22 (or 22A) which forms the protruding part 23F and the protruding part 23G is inclined toward the horizontal direction (X direction). In the raised portions 23F and 23G shown in FIG. 3, the side openings 35b and 37b are greatly opened toward the longitudinal center line OO, and the side openings 35a and 37a are directed toward the edge of the sanitary napkin. A small opening. Therefore, menstrual blood is less likely to diffuse toward the left and right edges of the napkin on the skin side surface of the sanitary napkin 1B.

  FIGS. 7A and 7B are perspective views showing a surface structure 120 of a sanitary napkin according to a second embodiment of the present invention and its manufacturing process.

  In 2nd Embodiment, as shown to FIG. 7 (A), the surface sheet 22 (or 22A) in which the slits 24, 25, 26, and 27 were formed is used. The method for forming the slit of the topsheet 22 is the same as that of the first embodiment shown in FIG.

  In the second embodiment, a tensile force Fx in the lateral direction (X direction) is applied to the topsheet 22 on which the slits 24, 25, 26, 27 are formed. By applying this tensile force Fx, the topsheet 22 is separated by the slits 24, 25, 26, and 27 and expanded in the X direction. As a result, the contraction force fy in the longitudinal direction (Y direction) is applied to the topsheet 22. Works.

  When the contraction force fy in the vertical direction acts and the topsheet 22 contracts in the vertical direction, the first wide portion 31 sandwiched between the slit 24 and the slit 25 is raised and deformed upward to form a raised portion 123A. Similarly, the second wide portion 32 sandwiched between the slit 26 and the slit 27 is raised and deformed upward to form a raised portion 123B. In addition, the first width detail 33 and the second width detail 34 are deformed in the lateral direction (X direction) when the topsheet 22 is pulled in the lateral direction. The function of linking 123A and the raised portion 123B is exhibited.

  The surface sheet 22 is joined to the base sheet 21 at a portion other than the raised portions 123A and 123B in a state where the tensile force Fx is applied. As a result, side openings 135a and 135b leading to the base sheet 21 are opened on both sides of the raised portion 123A, and side openings 137a and 137b leading to the base sheet 21 are formed on both sides of the raised portion 123B. Will be.

  Since the surface structure 120 can be formed simply by applying the tensile force Fx in the lateral direction to the topsheet 22 with slits, the manufacturing process is easy. Further, menstrual blood given to the surface structure 120 enters the side openings 135 a, 135 b, 137 a, 137 b, passes through the base sheet 21, and can quickly migrate to the liquid absorbing layer 4.

  The step of applying a lateral pulling force Fx to the surface sheet 22 can be realized by gradually pulling the surface sheet 22 in the X direction with a roller or the like when the surface sheet 22 is fed in the Y direction. Alternatively, the base sheet 21 and the surface sheet 22 shown in FIG. 7A are overlaid on the liquid absorbing layer 4 and the longitudinal compression grooves 11 and 11 are formed as shown in FIG. The raised portions 123A and 123B may be formed by applying a pulling force Fx. In this case, in the region sandwiched between the vertical compression groove 11 and the vertical compression groove 11, if the napkin is partially made bulky in advance, by forming the vertical compression grooves 11, 11, The tensile force Fx in the lateral direction is likely to act.

FIG. 8 is a perspective view showing a manufacturing process of the surface structure according to the third embodiment of the present invention.
In the third embodiment, as shown in FIG. 8 (A), a plurality of slits 28 extending continuously in the longitudinal direction (Y direction) are formed in the top sheet 22 (or 22A). The slits 28 are parallel to each other and are formed at a constant interval W3 in the lateral direction. The slits 28 may be formed at different intervals in the lateral direction.

  FIG. 8B shows a forming die 140 for forming the top sheet 22 shown in FIG. The molding die 140 is provided with a receiving die 141 and a pressing die 143 facing each other. A large number of forming convex portions 142 are formed on the receiving die 141. Each shaping | molding convex part 142 is the same shape, is continuous in a horizontal direction (X direction), and is formed in the vertical direction (Y direction) with a fixed space | interval. The upper surface 142a of each molding convex part 142 is formed to be curved in the Y direction.

  Further, the pressing mold 143 is provided with a pressing portion 144 that fits with a minimum gap between the forming convex portion 142 and the forming convex portion 142 arranged in the vertical direction. X direction).

  8A is sandwiched between the receiving die 141 and the pressing die 143, and the receiving sheet 141 and the pressing die 143 press the surface sheet 22 at room temperature, or the receiving die 141 The pressing die 143 is pressed in a state of being heated to a temperature equal to or lower than the softening point of the resin film constituting the top sheet 22. By this process, the surface sheet 22 is formed by protruding the portion sandwiched between the slit 28 and the slit 28 to form a protruding portion.

  A surface structure is formed by joining an intermediate portion (a portion pressed by the pressing portion 144) between the raised portion and the raised portion of the surface sheet 22 to the surface of the base sheet 21. This surface structure has a shape in which raised portions having a shape as shown in FIG. 4A are arranged at a constant pitch in the vertical direction and arranged in rows in the horizontal direction.

  FIGS. 9A and 9B show a surface structure 220 used in the sanitary napkin according to the fourth embodiment of the present invention and the manufacturing process thereof.

  In the fourth embodiment, as shown in FIG. 9A, a plurality of belt-like sheets 122 obtained by cutting the topsheet 22 (or 22A) with a certain width dimension W4 are used.

  The belt-like sheet 122 and the base sheet 21 are fed out in the Y direction. At this time, the feeding speed V1 of the belt-like sheet 122 is made faster than the feeding speed V2 of the base sheet 21. Then, as shown in FIG. 9B, the belt-like sheet 122 and the base sheet 21 are joined to each other by a joining part 221 spaced in the longitudinal direction (Y direction).

  Due to the difference in the feeding speed, the belt-like sheet 122 rises upward between the joint portion 221 and the joint portion 221 that are spaced apart in the vertical direction, and the raised portions 223A and 223B are formed. In the example of FIG. 4B, the ridges 223A and the ridges 223B are formed so that their arrangement periods are shifted from each other by half a pitch in the vertical direction. Further, in the embodiment shown in FIG. 9, the belt-like sheet 122 is drawn out in the lateral direction without substantially spacing, and the raised portions 223 </ b> A and 223 </ b> B are formed, so that the skin-side surface of the base sheet 21 is formed. The raised portions 223A and 223B exist without substantially leaving a gap.

  Therefore, menstrual blood that has returned from the liquid absorbing layer 4 to the surface of the base sheet 21 can be covered with the belt-like sheet 122, menstrual blood can be prevented from adhering to the skin, and menstrual blood absorbed by the liquid absorbing layer 4 can be prevented. The effect of hiding the color of can be demonstrated.

  In addition, the following method can also be implemented as a manufacturing process of the surface structure 220 shown in FIG.

  As the base sheet 21, one having elasticity in the vertical direction (Y direction) is used. For example, the base sheet 21 is corrugated, and a non-woven fabric such as a liquid-permeable and stretchable air-through nonwoven fabric is partially bonded to the clothing side surface of the base sheet 21.

  In a state where the base sheet 21 having stretchability is stretched in the vertical direction, the belt-like sheet 122 is joined to the skin side surface at intervals in the vertical direction to form the joint portion 221. Thereafter, the tensile force applied to the base sheet 21 is released, and the base sheet 21 is contracted in the vertical direction, whereby the raised portions 223A and 223B shown in FIG. 9B can be formed. In the first embodiment to the third embodiment and the modified examples thereof, and the embodiments described hereinafter, the base sheet 21 is similarly contracted by applying a pulling force. It is possible to form a raised portion.

  FIGS. 10A, 10B, and 10C are partial perspective views showing other embodiments of the surface structure that can be manufactured by the manufacturing process shown in FIG.

  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 non-woven fabric is a spunlace non-woven fabric mainly composed of hydrophilic fibers such as pulp and rayon, an air-through non-woven fabric obtained by fusing hydrophilic treated heat-synthetic composite synthetic fibers with hot air, or a synthetic treated with hydrophilic treatment. For example, a spunbonded nonwoven fabric formed of resin fibers is formed with a large number of liquid-permeable holes. Or the base sheet 21 of the resin film which formed many liquid permeable holes like each said embodiment can also be used.

  By the same manufacturing process as shown in FIG. 9, the belt-like sheet 122 is partially joined to the base sheet 321 at intervals in the vertical direction to form the joint 221, and the joint 221 and the joint 221 are formed. Between the two, the belt-like sheet 122 is raised upward to form the raised portions 233A and 223B.

  In the surface structure 220A shown in FIG. 10A, the ridges 223A and the ridges 223B are spaced apart from each other in the lateral direction, but the covering resin film 124 is formed in the gap between the ridges 223A and the ridges 223B. The covering resin film 124 is adhered to the skin side surface of the base sheet 321.

  The covering resin film 124 is substantially non-permeable like the top sheet 22 or is formed with a liquid permeable hole 22a having a relatively small opening area like the top sheet 22A. The liquid permeation function is inferior to 321. In any case, the coating resin film 124 is whitened including an inorganic filler.

  When menstrual blood is given to the surface structure 220A, the menstrual blood enters the raised portions 223A and 223B, passes through the base sheet 321 and is absorbed by the liquid absorbing layer. Further, since the surface of the base sheet 321 is covered with the raised portions 223A and 223B and the coating resin film 124, menstrual blood absorbed by the liquid absorbing layer 4 is difficult to adhere to the skin, and the raised portions 223A and 223B are covered with the surface. The color of menstrual blood on the resin film 124 can be hidden.

FIG. 10B shows a surface structure 220B that is a modification of the fifth embodiment.
In the surface structure 220A, the base sheet 321 is formed by an assembly of strip films, and liquid permeable holes are formed in the individual strip films. And the belt-like sheet | seat 122 is partially joined to the skin side surface of the base sheet 321, and the protruding parts 223A and 223B are formed.

  The raised portion 223A and the raised portion 223B are arranged at an interval in the lateral direction (X direction). Preferably, in the base sheet 321A, the number of stacked belt-like sheets is about one or two immediately below the raised portions 223A and 223B, and the number of laminated sheets is two or more between the raised portions 223A and the raised portions 223B. Yes, the number of stacked layers is larger than directly below the raised portions 223A and 223B. Accordingly, the base sheet 321A is configured to easily transmit the liquid directly below the raised portions 223A and 223B, and to have a poor liquid transmission function between the raised portions 223A and the raised portions 223B.

  In the surface structure 220B, the given menstrual blood moves to the inside of the raised portions 223A and 223B, and is given to the liquid absorbing layer 4 through the liquid permeation holes of the belt-like sheet having a small number of laminated sheets. In addition, the skin side surface of the base sheet 321A is covered with the raised portions 223A and 223B, and the portion that is not covered with the raised portions 223A and 223B has a reduced liquid transmission function, and is thus absorbed by the liquid absorbing layer 4. Menstrual blood is less likely to ooze out to the outermost surface, making it difficult to touch the skin. In addition, the color of menstrual blood absorbed by the liquid absorbing layer 4 can be hidden.

  FIG. 10C is a partial perspective view showing a surface structure 220C according to a modification of the fifth embodiment.

  The base sheet 421 of the surface structure 220C is formed of a resin film 422 having a large number of liquid-permeable holes on the skin side surface, and a nonwoven fabric formed of hydrophilic fibers or hydrophilic processed synthetic resin fibers on the clothing side surface. 423 is overlapped and bonded. The belt-like sheet 122 is partially joined on the base sheet 421 to form raised portions 223A and 223B.

  And the said base sheet | seat 421 is formed with the hollow 424 in the part located just under the protruding parts 223A and 223B. The raised portion 223A and the raised portion 223B are arranged at an interval in the lateral direction (X direction), and no depression is formed in the base sheet 421 between the raised portion 223A and the raised portion 223B.

  When menstrual blood is given to the surface structure 220C, the menstrual blood enters the ridges 223A and 223B from the side openings that are open to the sides of the ridges 223A and 223B, and the menstrual blood reaches the inside of the depression 424. From the base sheet 421 to the liquid absorption layer 4 through the liquid permeation holes.

  Since the liquid can be retained in the recess 424, even if a large amount of menstrual blood is given in a short time, the menstrual blood is temporarily retained in the recess 424, thereby preventing lateral diffusion. Further, since the belt-like sheet 122 that forms the raised portions 223A and 223B exists on the depression 424, menstrual blood in the depression 424 is difficult to adhere to the skin.

  Furthermore, in each said embodiment, each bulge part can be raised using the sanitary napkin deform | transforming into a curved shape, or the height of a bulge part can be increased. When the sanitary napkin is attached to the crotch part, the sanitary napkin is deformed so that the skin side surface is depressed, so that a raised portion can be formed at the deformed portion, or the height of the raised portion can be increased.

  Alternatively, a leak-proof wall is provided on the skin-side surface of the sanitary napkin in the longitudinal direction, and the skin-side surface is deformed by the elastic contraction force of the leak-proof wall so that the raised portion is raised. Alternatively, the height of the raised portion may be increased.

  That is, as the sanitary napkin is deformed, the raised height of the raised portion is increased, and the diffusion of menstrual blood in that portion can be prevented, so that the effect of preventing the side leakage of menstrual blood can be further enhanced.

FIG. 11 is a perspective view showing a surface structure 520 according to the sixth embodiment of the present invention.
For the surface structure 520, the surface sheet 22A having the liquid permeation holes 22a shown in FIG. 5A or 5B is used. The top sheet 22A is not formed with slits, and is supplied to the molding die 40 shown in FIG. 6B, and is clamped by the receiving die 41 and the pressing die 43 at room temperature. Or you may overheat to the temperature below the softening point of a resin film, and you may clamp. The raised portions 523A and 523B are formed on the surface sheet 22A by the molding convex portion 42 of the receiving die 41. At this time, the liquid-permeable holes 22a of the surface sheet 22A are expanded and expanded, or the liquid-permeable holes 22a are expanded. As a result, the surface sheet 22A is broken at the periphery thereof, a side opening 535a that opens in both directions in the X direction is formed in the raised portion 523A, and the side opening 537a is formed in the raised portion 523B. Is formed.

  In this embodiment, the opening areas of the side openings 535a and 537a are slightly smaller than those of the above embodiments. Therefore, menstrual blood that has migrated to the inside of the raised portions 523A and 523B is difficult to come out and adhere to the skin, and the liquid absorbing layer is formed through the liquid-permeable holes 21a of the base sheet 21 located under the raised portions 523A and 523B. 4 makes it easy to be absorbed.

  The present invention is not limited to the embodiments described above, and various modifications can be made. 12A, 12B, and 12C are perspective views illustrating other embodiments.

  In the surface structure 520A shown in FIG. 12 (A), substantially cube-shaped raised portions 523C and 523D are formed by sandwiching a surface sheet 22A having a large number of liquid-permeable holes 22a with a molding die. The transmission holes 22a are expanded, or the resin film around the liquid transmission holes 22a is broken to form side openings 535a and 537a. The raised portions 523C and the raised portions 523D are arranged side by side in the lateral direction (X direction). In the embodiment shown in FIG. 4 or FIG. 5, each raised portion may be formed into a cubic shape as shown in FIG.

  In the surface structure 520B shown in FIG. 12B, a dome-shaped raised portion 523E is formed by sandwiching a surface sheet 22A having a large number of liquid-permeable holes 22a with a molding die. The holes 22a are expanded, or the resin film around the liquid permeation holes 22a is broken to form a plurality of side openings 536 around the dome-shaped base.

  As shown in FIGS. 12A and 12B, the shape of the raised portion can be arbitrarily changed. Further, in these surface structures 520A and 520B, since the portions other than the raised portions cover the base sheet 21, menstrual blood that has exuded from the base sheet 21 is difficult to adhere to the skin, and the menstrual blood absorbed by the liquid absorbing layer 4 Can be hidden by the top sheet 22A.

  A surface structure 620 shown in FIG. 12C is a modification of the embodiment shown in FIGS. 8, 9 and 10A, 10B, and 10C. In this surface structure 620, both side edges of the belt-like sheet 122A forming the raised portions 223C and 223D are not straight, but are provided with a jagged portion 123.

  In the present invention, in each of the above-described embodiments, the base sheet and the top sheet may be formed of only a resin film, or the base sheet and the top sheet may be formed on a resin film directed to the skin side surface and the clothing side thereof. It can be formed with a hydrophilic non-woven fabric superimposed on the surface.

The perspective view which shows the sanitary napkin of the 1st Embodiment of this invention with the clothing side surface facing upwards, Half sectional view of the sanitary napkin shown in FIG. Partial sectional view showing a modification of the sanitary napkin, (A) is an exploded perspective view showing the surface structure of the sanitary napkin of the first embodiment, (B) is an explanatory view for explaining the shape of the side opening and the bottom opening of the surface structure, (A) is an exploded perspective view showing a modification of the surface structure of the sanitary napkin of the first embodiment, (B) is an enlarged cross-sectional view taken along line BB of (A), (A) (B) is a perspective view which shows an example of the manufacturing method of the surface structure of the 1st Embodiment of this invention, (A) (B) is a perspective view for demonstrating the surface structure of the 2nd Embodiment of this invention, and its manufacturing process, (A) (B) is a perspective view which shows the manufacturing process of the surface structure of the 3rd Embodiment of this invention, (A) and (B) are perspective views showing a surface structure body and a manufacturing process thereof according to a fourth embodiment of the present invention, (A), (B), and (C) are partial perspective views showing a surface structure body according to a fifth embodiment of the present invention and a modification thereof, The perspective view which shows the surface structure of the 6th Embodiment of this invention, (A) (B) (C) is a perspective view showing a surface structure as a modification of each embodiment,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Sanitary napkin 3 Back sheet 4 Liquid absorption layer 5 Side sheet 6 Liquid absorption area 11 Longitudinal compression groove 12 Front lateral compression groove 13 Back lateral compression groove 14 Central absorption area 20, 20A, 20B Surface structure 21 Base sheet 21a Liquid permeation hole 22, 22A, 22B Surface sheet 22a Liquid permeation hole 23, 23A, 23B, 23D, 23E, 23F, 23G Raised part 24, 25, 26, 27, 28 Slit 31 First wide part 32 Second Wide portion 33 First width detail 34 Second width detail 35a, 35b, 37a, 37b Side opening 36, 38 Bottom opening 39a, 39b Front / rear opening 40 Molding die 41 Receiving die 43 Pushing die 45 Menstrual blood 120 Surface structure 122 Band-like sheet 123A, 123B Raised portion 124 Covered resin film 135a, 135b, 137a, 137 Lateral opening 220,220A surface structure 221 joints 223A, 223B ridges 520,520A, 520B, 620 surface structures 523A, 523B, 523C, 523D, 523E ridges 535a, 537a, 536 lateral opening

Claims (15)

In a sanitary napkin having a liquid absorbing layer and a surface structure covering the skin side surface of the liquid absorbing layer,
The surface structure has a liquid-permeable base sheet covering the skin-side surface of the liquid-absorbing layer, and a surface sheet positioned on the skin-side surface of the base sheet, and the surface sheet has at least a skin-side surface. Made of resin film,
The top sheet is formed with a large number of raised portions 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 on the side of the raised portion. A sanitary napkin characterized by.   In the surface sheet, a plurality of slits extending in the vertical direction with a gap in the horizontal direction are formed with a gap in the horizontal direction and the vertical direction, and located between the slits adjacent to each other in the horizontal direction. The sanitary napkin according to claim 1, wherein the raised portion is formed by a portion of the topsheet, and the topsheet and the base sheet are joined at a portion other than the raised portion.   The horizontal spacing of the slits differs depending on the location, the wide part sandwiched between the slits is raised to the skin side to form the raised part, and the width of the wide part sandwiched between the slits is larger than the wide part. The sanitary napkin according to claim 2, wherein the small width detail is located closer to the surface of the base sheet than the top of the raised portion.   The sanitary napkin according to claim 3, wherein the wide portions and the width details are alternately formed in a lateral direction.   The sanitary napkin according to any one of claims 2 to 4, wherein the raised portion is formed by deforming a portion sandwiched between the slits of the top sheet toward the skin side.   In a state where the surface sheet is expanded in the horizontal direction and contracted in the vertical direction, the surface sheet is joined to the base sheet at a plurality of locations, so that the portion sandwiched between the slits faces the skin side. The sanitary napkin according to any one of claims 2 to 4, wherein the sanitary napkin is formed by being raised.   The top sheet is a plurality of strip-like sheets that are separated from each other and extend continuously in the longitudinal direction, and each strip-like sheet is joined to the base sheet at joint portions spaced in the longitudinal direction and adjacent to the base sheet. The sanitary napkin according to claim 1, wherein a portion of the belt-like sheet between mating joints is raised from the base sheet toward the skin side to form the raised portion.   The sanitary napkin according to claim 7, wherein the belt-like sheets are arranged at intervals in the lateral direction, and a covering resin film is provided between adjacent belt-like sheets to cover the surface of the base sheet.   The sanitary napkin according to claim 7 or 8, wherein the raised portion is formed by deforming the belt-like sheet toward the skin side.   The base sheet is contracted in the vertical direction, and the interval between the joint portions of the top sheet and the base sheet is approached in the vertical direction, whereby the top sheet is raised from the base sheet to form the raised portion. The sanitary napkin according to any one of claims 2, 3, 4, 6, 7, and 8.   The sanitary napkin according to any one of claims 2, 3, 4, 6, 7, and 8, wherein when the sanitary napkin is deformed so that the skin side surface is depressed, the top sheet is raised from the base sheet. The sanitary napkin according to crab.   An opening is formed in the resin film forming the top sheet, and the opening is expanded or the resin film is broken around the opening to form the side opening. The sanitary napkin according to claim 1.   The sanitary napkin according to any one of claims 1 to 12, wherein the base sheet is formed of a liquid permeable sheet having a liquid permeable function higher than that of the top sheet.   The sanitary napkin according to claim 13, wherein at least the skin side surface of the base sheet is formed of a resin film having a large number of liquid-permeable holes.   A liquid permeable hole is formed in the resin film appearing on the skin side surface of the top sheet, and an opening area ratio of the liquid permeable hole of the top sheet is lower than an opening area ratio of the liquid permeable hole of the base sheet. 14. A sanitary napkin according to 14.

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