JP6538527B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners (cone sheets) and incontinence pads.

Heretofore, from the viewpoint of, for example, the improvement of the fit to the body of the wearer, it has been widely practiced to provide an absorbent article such as a sanitary napkin or the like with a protruding portion projecting toward the skin side of the wearer. In such an absorbent article, it is common to provide a protrusion on a part of the absorbent core disposed inside.
Also proposed is a method of controlling the movement of the liquid absorbed from the protuberances by providing an area higher in density than the part forming the protuberances in the parts located on both sides of the protuberances in the absorber. (See Patent Documents 1 and 2). In Patent Documents 1 and 2, forming a leak-proof groove in which a surface sheet and an absorber are integrally recessed is provided outside the region with a high density in the width direction. Is also described.

JP 2002-345888 A JP 2011-120696 A

  By the way, the menstrual blood which is a liquid which a sanitary napkin absorbs may have a case where viscosity is low, and a case where viscosity is relatively high, depending on the time or individual difference during the period of menstruation, and the physical condition of the occasion. In any case, from the viewpoint of preventing inconvenience such as stickiness and itching due to the wetting of the skin, the liquid excreted on the absorbent article is absorbed by the absorbent so as to be isolated from the skin in a short time as much as possible. Although it is desirable that the conventional absorbent articles show high absorption performance for low viscosity liquids, many of them do not show sufficient absorption performance for high viscosity liquids.

  The present invention relates to an absorbent article that exhibits good absorption performance even for body fluids with relatively high viscosity.

  The present invention comprises a skin-side sheet forming the skin-facing surface, a non-skin-side sheet forming the non-skin-facing surface, and an absorber including an absorbent core, and the front portion, the excretion portion facing portion, and the rear portion in the longitudinal direction The skin side sheet, the part overlapping the absorbent core comprises a liquid permeable top sheet, and the absorbent core is elongated in the longitudinal direction of the absorbent article It has a shape and is located between the pair of side regions forming the both sides of the absorbent core and the pair of side regions in the excretory part facing portion, and the basis weight is more than that of each side region A large central high basis weight region, and the central high basis weight region divides the length of the absorbent core in the width direction of the absorbent core at the portion facing the excretory part by seven. It is in the center five areas when it is divided into two areas, and the excretory part opposing part is the skin opposing surface, the surface And a pair of side leak-proof grooves extending in the longitudinal direction of the absorbent core in which the absorber and the absorbent body are integrally recessed, and the central high basis weight region is divided into three equally divided maximum widths. And the side leakage leakage grooves straddle the central side area and the side area, and enter the central area. The absorbent article is provided, wherein at least the central region of the central high basis weight region is thicker than at least a part of a portion where the side leakproof groove is not formed in the side region. It is

  According to the present invention, an absorbent article is provided that exhibits good absorption performance even for body fluids with relatively high viscosity.

FIG. 1 is a partially broken perspective view of a sanitary napkin according to an embodiment of the present invention. 2 (a) is a cross-sectional view taken along line IIa-IIa of FIG. 1, and FIG. 2 (b) is a cross-sectional view taken along line IIb-IIb of FIG. FIG. 3 is a schematic plan view showing the positional relationship between the leak-proof groove and each part of the absorbent core in the sanitary napkin shown in FIG. 1, and is a view showing only the range overlapping with the absorber. FIG. 4 is a schematic plan view showing the positional relationship between the pressing groove and each part of the absorbent core in another embodiment of the present invention. FIG. 5 is a plan view of an absorber showing a preferred arrangement of the compression section. 6 (a) and 6 (b) are each an enlarged plan view showing an example of a preferred arrangement of the compression section. FIG. 7 is a schematic view showing an essential part of a fiber-stacking device preferably used for producing the absorbent core of the sanitary napkin shown in FIG. Fig.8 (a)-FIG.8 (c) are explanatory drawings of the manufacturing method of the absorber of the sanitary napkin shown in FIG.

The present invention will be described based on its preferred embodiments with reference to the drawings.
A sanitary napkin 1 (hereinafter, also simply referred to as a napkin 1), which is an embodiment of the absorbent article of the present invention, has a skin side sheet 10 forming a skin facing surface, and a non-skin facing surface, as shown in FIG. The non-skin side sheet | seat 13 which forms, and the absorber 14 containing the absorptive core 40 are provided. As shown in FIG. 2, the absorber 14 is disposed between the skin side sheet 10 and the non-skin side sheet 13.
In the absorbent article such as a sanitary napkin, the skin facing surface P is a surface directed to the skin side of the wearer when worn, and the skin side sheet 10 described above forms the skin facing surface. Moreover, in absorbent articles, such as a sanitary napkin, the non-skin opposing surface Q is a surface that is directed to the side opposite to the wearer's skin side, usually the garment side, when wearing the non-skin side sheet 13 described above, The non-skin opposing surface is formed.
Moreover, the napkin 1 has the front part A, the excretion part opposing part B, and the back part C in the longitudinal direction X. As shown in FIG. In an absorbent article such as a sanitary napkin, the longitudinal direction X is a direction coinciding with the longitudinal direction of the wearer when worn, and the transverse direction Y is orthogonal to the longitudinal direction X in plan view of the absorbent article. Direction. Further, the excretory part opposing part B is a part where the liquid excretory part (vagina etc.) of the wearer is disposed opposite to the central part in the width direction when worn, and the front part A is more than the excretory part opposing part B when worn The rear part C is a part placed on the back side of the excretory part facing part B when worn.

The napkin 1 has an absorbent main body 15 having a constitution in which the skin side sheet 10, the absorbent core 40, and the non-skin side sheet 13 are laminated in the thickness direction at the central portion in the width direction Y. A pair of wing portions 17 and 17 are formed on the left and right sides of the absorbent main body 15 in B, and a pair of rear flap portions 18 and 18 are formed on the left and right sides of the absorbent main body 15 on the rear portion C.
The skin side sheet | seat 10 in this embodiment is equipped with the liquid-permeable surface sheet 11 and a pair of side sheets 12 and 12 joined on the both sides, as shown in FIG. The liquid-permeable top sheet 11 extends in the longitudinal direction X at the central portion in the width direction Y of the napkin 1. The side sheets 12 are disposed on both sides in the longitudinal direction X of the napkin 1 and, as shown in FIG. 2A, in a state where a part on the inner edge 12a side is overlapped on the surface sheet 11, It is joined to the surface sheet 11 at a position slightly outward in the width direction Y from the edge 12a. The pair of wings 17, 17 and the pair of rear flaps 18, 18 are composed of the side sheet 12 and the non-skin side sheet 13 extending from the side edges of the absorbent main body 15. A wing adhesive part (not shown) for fixing to the non-skin opposing surface of the crotch part of the shorts is provided on the non-skin side sheet 13 side of the wing 17 and the non-skin facing of the absorbent main body 15 is provided. The surface is provided with a main body adhesive portion (not shown) for fixing the absorbent main body 15 to the inner surface of the shorts. It is preferable that an adhesive portion be provided also on the surface on the non-skin side sheet 13 side of the rear flap portion 18 in order to be fixed to the inner surface of the shorts.

  The skin-side sheet 10 and the non-skin-side sheet 13 are joined together with an adhesive at portions extending outward from the peripheral portion of the absorbent body 14 and heat melting or the like by heat sealing or the like at the peripheral portion of the napkin 1 It is joined by wearing.

  As shown in FIGS. 1 and 3, the absorbent body 14 in the present embodiment includes a longitudinally long absorbent core 40 which is long in the same direction as the longitudinal direction X of the napkin 1. The absorbent core 40 is made of a fiber assembly made of a fiber material such as pulp fibers, or one in which a superabsorbent polymer is held between the fibers of the fiber assembly. The absorbent body 14 also includes a core wrap sheet (not shown) that wraps the absorbent core 40. In detail, the absorbent core 40 is covered with a core wrap sheet made of tissue paper or a water-permeable non-woven fabric, on both the side edges in the longitudinal direction X and the entire upper and lower surfaces. The core wrap sheet is used for the purpose of preventing the leakage of the material forming the absorbent core 40 and enhancing the shape retention property of the absorbent core 40. It is preferable that the entire periphery of the cross section in the width direction of the absorbent core 40 be covered with the absorbent core 40 by one or more core wrap sheets. For example, both side portions of one core wrap sheet disposed on the skin facing surface or non-skin facing surface of the absorbent core 40 are folded back to the other surface of the absorbent core 40, and the folded portion is It is also preferable to be laminated on both sides of another core wrap sheet covering the other side. The sheets in the laminated portion may not be bonded but are preferably bonded.

Between the skin side sheet 10 and the absorbent body 14, between the absorbent core 40 and the core wrap sheet covering the skin facing surface side thereof, and the core wrap sheet covering the absorbent core 40 and the non-skin facing surface side thereof It is preferable that the gaps be bonded to each other by an adhesive coated in an intermittent pattern such as a dot pattern, a spiral pattern, a stripe pattern, or a checkered pattern.
In the napkin 1 of the present embodiment, the longitudinal direction and the width direction of the absorbent core 40 coincide with the longitudinal direction X and the width direction Y of the napkin 1 (absorbent article). The longitudinal direction and the width direction are also expressed as the longitudinal direction X and the width direction Y. Further, although the core wrap sheet is not illustrated, at the position of the compression portion 6, the core wrap sheet is recessed along with the absorbent core 40 from the skin facing surface P side of the absorbent 14 toward the non-skin facing surface Q side. doing. 2 (a) and 2 (b) are collectively referred to as FIG. 2 and FIGS. 8 (a) to 8 (c) are collectively referred to as FIG.

  As shown in FIG. 2 and FIG. 3, the absorbent core 40 has a pair of side regions 45, 45 forming the both sides of the absorbent core 40, and a pair of side regions 45, And a central high basis weight area 41 located between 45 and having a larger basis weight than each side area 45. The central high basis weight area 41 is the area where it is present, ie, the center 5 when the length in the width direction of the absorbent core 40 in the excretory part facing portion B is equally divided into seven areas. In one area. In other words, the central high basis weight region 41 is formed so as to be contained in the central five regions when the length in the width direction of the absorbent core 40 in the excretion portion facing region B is equally divided into seven. For this reason, the central high basis weight region is easily arranged selectively in the excretory part of the wearer. When the length in the width direction of the absorbent core 40, that is, the width of the absorbent core 40 changes in the longitudinal direction of the excretion portion facing portion B, the length in the width direction of the maximum width portion is equally divided into seven. Divided into Also, the sections are each divided by parallel straight lines extending in the longitudinal direction of the napkin 1.

  As shown in FIG. 3, the central high basis weight region 41 in the present embodiment is formed in an oval shape in plan view, and is formed at the central portion in the width direction Y of the absorbent core 40. It is preferable that the central high basis weight region 41 be formed in a longitudinally long shape in which the length along the longitudinal direction X of the absorbent core 40 is longer than the length along the width direction Y of the absorbent core 40. The pair of side regions 45, 45 are formed to extend in the longitudinal direction X of the absorbent core 40 on both sides in the longitudinal direction of the absorbent core 40. The side regions 45 are formed so as to extend outward along the respective side ends 41 s of the both side ends 41 s of the central high basis weight area 41, and the side regions 45 are formed on the side ends 41 s of the central high basis weight region 41. It has an inner end 45 a along with a straight outer end 45 b which constitutes a part of the side edge of the absorbent core 40. The plan view shape of the central high basis weight area 41 is an oval, a vertically elongated rectangular shape, an oval or a vertically elongated rectangular shape with a narrowed central portion, or another shape such as a square or a circle instead of the oval shape. It is good.

Further, as shown in FIG. 2 and FIG. 3, the absorbent core 40 in the present embodiment has a central high basis weight region 41 and two parallel straight lines Ls and Ls that divide the maximum width W1 into three equal parts. At least the central area 42 of the central high basis weight area 41 is thicker than the side areas 45 when divided into the area 42 and the central side areas 43 and 43. In addition, the thickness of the central region 42 is thicker than at least a part of the central side regions 43 and 43 other than the region provided with the leak-proof groove described later. Two parallel straight lines Ls, Ls are drawn parallel to the longitudinal direction X of the napkin 1.
More specifically, the absorbent core 40 in the present embodiment has high density regions 43 d on both sides in the longitudinal direction of the central high basis weight region 41, and each of the high density regions 43 d is a high density region 43 d and The density is higher than that of the adjacent side area 45 and the central area 42 respectively. A region 44 located between the pair of high density regions 43 d and 43 d and having a central region 42 at the center is a thick region 44 thicker than the side regions 45. That is, the central area 42 is thicker than the high density area 43 d in the central side area 43.

  As shown in FIG. 2, the thick-walled region 44 forms a protrusion 5 that protrudes to the surface of the absorbent core 40 facing the skin. The protrusion 5 is a part of the thick region 44 in the thickness direction. Further, the thick region 44 and the protrusion 5 formed of a part of the thick region 44 are formed in the central portion of the central high basis weight region 41 in the width direction Y of the absorbent core 40, and the absorbent core In a plan view of 40, it has a long shape in the longitudinal direction X of the absorbent core 40. The high density region 43 d is formed to extend in the longitudinal direction X of the absorbent core 40 on both sides in the longitudinal direction of the central high basis weight region 41, and has a long shape in the longitudinal direction X of the absorbent core 40. ing. In each of the central area 42, the central side area 43, the thick area 44, the protrusion 5, and the high density area 43d in the present embodiment, the length along the longitudinal direction X of the absorbent core 40 is the absorbent core 40. It is formed in a longitudinally long shape longer than the length along the width direction Y of the. In the high density region 43 d, a pair of outer end portions along the longitudinal direction of the absorbent core 40 is adjacent to the side region 45.

  The central area 42, the central side area 43, the thick area 44, the protrusion 5, and the high density area 43d are all formed at least at the excretory part opposing part B in the absorbent article such as the napkin 1. In the example shown in FIG. 1, it is formed from the vicinity of the front end of the excretory part facing part B to a part of the rear part C. The central area 42, the central side area 43, the thick area 44, the protrusion 5 and the high density area 43d all extend over 20% to 100% of the entire length of the absorbent core 40 in the longitudinal direction X. It is preferable to be formed over the length of 30% or more and 100% or less of the entire length of the absorbent core 40.

  As shown in FIG.2 and FIG.3, the napkin 1 of this embodiment has the pressing groove 7 as a leak-proof groove which the surface sheet 11 and the absorber 14 indented integrally in the skin opposing surface. In the absorbent core 40, the density of the portion where the pressing groove 7 (side pressing groove, front pressing groove, back pressing groove) is formed is the same as the pressing groove 7 (side pressing groove, front pressing groove, back) Higher than the density of the part where the pressing groove is not formed. The absorbent core 40 has an absorbent core in which the density of the portion where the side compression grooves are formed in the central side area is higher than the density of the portion where the side compression grooves are not formed in the central side area. The density of the portion where the side pressing groove is formed in the side area of 40 is higher than the density of the portion where the side pressing groove is not formed in the side area. The squeezing groove 7 is, for example, a ridge having a shape corresponding to the shape of the squeezing groove on the circumferential surface of a laminated body in which the surface sheet 11 and the absorber 14 are laminated, or a laminated body in which these other sheets are laminated. Between the heatable emboss roll having the surface and the flat smooth anvil roll, with the surface on the surface sheet side facing the emboss roll side, and embossing is performed, and the laminated body is subjected to the convex streak portion and the anvil It can be formed by partially squeezing with the roll surface. Although not shown, the pressing groove 7 has high pressing parts and low pressing parts at different levels of compression at its bottom.

  Moreover, as shown in FIGS. 1 to 3, the napkin 1 of the present embodiment, as the above-mentioned compressed grooves 7, generally absorbs a pair of side compressed grooves 71 and 71 extending in the longitudinal direction X of the absorbent core 40. It has the front side pressing groove 72 and the rear side pressing groove 73 which extend in the width direction Y of the sex core 40. In a plan view of the napkin 1, the front squeezing groove 72 has an arc shape convex toward the front end 40 a of the absorbent core 40 disposed on the front side of the napkin 1, and the rear squeezing groove 73 is the napkin 1. The rear end 40b of the absorbent core 40 disposed on the rear side of the second embodiment has a convex arc shape.

Further, the side compression grooves 71, 71 are formed so as to straddle the central side area 43 and the side area 45, respectively. The “formed so as to straddle the central side area 43 and the side area 45” has a portion located on the central side area 43 of the absorbent core 40 and a portion located on the side area 45. It means that it is formed. Further, the side compression grooves 71, 71 do not enter into the central region 42, respectively. More specifically, the pair of side compression grooves 71, 71 in the napkin 1 of the present embodiment is as shown in FIG. The first portion 71b extends in the longitudinal direction X while meandering in the width direction Y of the absorbent core 40, and overlaps with the central side area 43, and the first portion 71b thereof. It has second portions 71 a and 71 c which extend obliquely with respect to the longitudinal direction X and are located on the side regions 45.
Moreover, the side pressing groove 71 in this embodiment is a front side second portion 71a located forward of the first portion 71b with respect to the respective first portions 71b, and a rear side located rearward of the first portion 71b. And two portions 71c.
Furthermore, as shown in FIG. 3, the side compression grooves 71 in the present embodiment are separated from each other in the longitudinal direction X of the absorbent core 40 by a plurality of first portions 71 b overlapping with the central side area 43 (illustrated example In the second region, and each of the plurality of first portions 71b extends obliquely with respect to the longitudinal direction X of the absorbent core 40 and is located on the side region 45, the front second portion 71a and a rear second portion 71c.

Further describing the side compression grooves 71 in the present embodiment, the first portion 71 b overlapping the central side area 43 overlaps the high density area 43 d in the central side area 43. In addition, the first portion 71 b overlapping the central side area 43 has a plan view shape bent or curved inward in the width direction Y of the absorbent core 40 in a convex shape. An inner curved portion of the alternately formed inner and outer curved portions is formed. Further, the side pressing groove 71 is a rear side second portion 71c of the front side (front side A side) first portion 71b of the two first portions 71b separated in the longitudinal direction X of the absorbent core 40, The front second portion 71a of the first portion 71b on the rear side (rear portion C side) is continuous, and these are integrally projected outward in the width direction Y of the absorbent core 40. An outer curved portion having a bent or curved plan view shape is formed.
Further, as shown in FIG. 3, in the pair of side compression grooves 71, 71, the front end portion and the rear end portion are connected to the front side compression groove 72 and the rear side compression groove 73, and as a whole, they are central An annular squeezing groove is formed to annularly surround the central area 42 of the high basis weight area 41 and the thick area 44.

The napkin 1 of the present embodiment is used by being fixed to the crotch portion of the short, as in a normal sanitary napkin.
When liquid such as menstrual blood is discharged onto the surface sheet 11 of the excretory part facing part B of the napkin 1 during wearing of the napkin 1, the liquid is thick at least in the central area 42 of the central high basis weight area 41. By passing through the surface sheet 11 on the central high basis weight region 41 which is easily fitted to the liquid excretory part of the wearer and the like, and is rapidly absorbed in the high basis weight central high basis weight region 41 . A side compressed groove 71 whose density is increased by squeezing the high basis weight region is formed in the central side area 43 of the central high basis weight region 41, so that the side in the central high basis weight region 41 is formed. A density gradient occurs in the area where the direction squeezed portion 71 is not formed and in the portion where the liquid squeezed in the central high basis weight area 41 is easily transferred toward the side squeezed portion 71.
Furthermore, since the side compression groove 71 is formed to extend from the central side area 43 to the side area 45, the liquid transferred to the side compression groove 71 of the central side area 43 is a side compression groove. 71 is a passage of liquid, and it moves to the side area 45 and diffuses. Conversely, when a large amount of body fluid is excreted at once, the body fluid flowing along the surface of the central high basis weight area 41 is blocked by the side squeezing groove 71 of the side area 45, and a certain amount of body fluid is squeezed Since it can be returned to the high basis weight area near the center along the groove 71, the side leakage of the body fluid is easily suppressed.
Thus, since the discharged liquid can be absorbed quickly and diffused to the side area 45, the liquid in the surface sheet 11 on the central high basis weight area 41 or between the surface sheet 11 and the absorber 14 Is suppressed, and stagnation of the liquid in the surface sheet 11 or between the surface sheet 11 and the absorber 14 is suppressed.
By such an action, according to the napkin 1 of the present embodiment, even in the case of not only a liquid having a low viscosity but also a liquid having a relatively high viscosity, the side of the central side area 43 of the central high basis weight area 41 Since the direction squeezed portion 71 is formed, the effect of the coarse and dense gradient is effectively exhibited, and the retention of the liquid in the surface sheet 11 or between the surface sheet 11 and the absorber 14 is effectively suppressed, and the liquid is It can effectively suppress the occurrence of stickiness and discomfort due to reattachment to the skin, and effectively prevent itching and the like caused by the skin becoming excessively moist. it can.
In addition, the fact that the side compression grooves 71 do not enter the central region 42 has an advantage that the napkin 1 does not become excessively hard and fits softly to the wearer.

In addition, when the thick area 44 including the central area 42 and the central area 42 in the central high basis weight area 41 of the napkin 1 forms the protruding portion 5 protruding to the surface on the skin facing surface P side, the protruding portion 5 However, since the excreted liquid is reliably absorbed by the central high basis weight region 41 because the liquid excrement part of the wearer and the like is more easily fitted, the above-described effect is achieved more reliably.
In addition, the central high basis weight region 41 has a high density region 43 d having a density higher than that of the side regions 45 and the central region 42, and each side pressing groove 71 has a high density region 43 d and a side region 45. When it is formed so as to straddle, the liquid absorbed in the central high basis weight area 41 is more easily transferred from the central area 42 to the side compression grooves 71 through the high density area 43 d of the central side area 43. Furthermore, even when it is not excreted in the central region 42 or when it can not be absorbed in the central region 42 and flows in the surface sheet 11, in the surface sheet 11, or between the surface sheet 11 and the absorber 14, the high density region Since the light is absorbed by 43d, the above-mentioned effect is more surely exhibited.

Moreover, each side pressing groove 71 in the napkin 1 of the present embodiment extends obliquely with respect to the longitudinal direction X of the absorbent core 40 from the first portion 71 b overlapping the central side region 43 and the first portion 71 b. And the second portion (the front second portion 71a and the second rear portion 71c) located on the side region 45, the liquid transferred to the first portion 71b overlapping the central side region 43 is the side region It can be induced also in the X direction, and the absorbent core 40 can be used effectively.
Such an effect is exhibited when only one of the front side second portion 71a and the side second portion 71c is provided, but is more effective when both the front side second portion 71a and the side second portion 71c are provided. It will play well.

  Moreover, each side pressing groove 71 in the napkin 1 of the present embodiment has a plurality of first portions 71 b overlapping with the central side region 43, and corresponding to each of the plurality of first portions 71 b, the front side Since the second portion 71a and the side second portion 71c are provided, a plurality of density gradients of the side compression grooves 71 formed in the central high basis weight region 41 and the central side region 43 are formed, The absorbent core 40 can be used more effectively because the absorbed liquid can be more rapidly transferred and the liquid can be diffused.

Moreover, as shown in FIG.1 and FIG.2 (b), the napkin 1 of this embodiment equips the center area 42 of the center high basic weight area | region 41 with the through-hole 46 which penetrates the surface sheet 11 and the absorber 14. ing. A plurality of through holes 46 are formed at different places in the longitudinal direction X of the napkin 1 of the absorbent core 40 and the absorbent core 40.
By providing the through holes 46 penetrating the top sheet 11 and the absorber 14 in the discharge portion, it is possible to improve the draw-in property of the liquid in the central region 42, and therefore, the side pressing portions formed in the central side region 43 The effect of the density gradient according to 71 is more effectively exerted, and the liquid can be more effectively prevented from remaining in the surface sheet 11 or between the surface sheet 11 and the absorber 14. The same effect can be obtained also in the case where a through hole penetrating only the absorbent body 14 is provided instead of the through hole 46 penetrating the top sheet 11 and the absorbent body 14.
The number of the through holes 46 provided in the central region 42 of the central high basis weight region 41 is, for example, 2 or more and 150 or less, preferably 2 or more and 100 or less.

Moreover, as shown in FIG. 3, a pair of side compression grooves 71 and 71 in the napkin 1 of the present embodiment are continuously from the portion disposed in the excretion portion facing portion B to the front portion A and the rear portion C. It is extended.
When the side compression grooves 71, 71 extend to one or both of the front portion A and the rear portion C, the absorber 14 in the front portion A or the rear portion C can be effectively used, and the central height The liquid drawn in the central high basis weight region 41 is further improved by transferring and diffusing the liquid absorbed in the basis weight region 41 to the front portion A and the rear portion C by the side pressing grooves 71. Thus, the liquid residue in the topsheet 11 and between the topsheet 11 and the absorber 14 can be further reduced. As shown in FIG. 4, the pair of side compression grooves 71, 71 respectively have a width direction overlapping portion 71 d between the other compression grooves 74, 75, and as a whole, the front portion A The same effect can be obtained when extending to one or both of the rear portion C and the rear portion C.

Further, as shown in FIGS. 2 and 5, the napkin 1 of the present embodiment is a local area in which the high density region 43 d of the absorbent core 40 is recessed from the skin facing surface P toward the non-skin facing surface Q. A plurality of compressed portions 6 which are high density portions are formed in a scattered manner with intervals therebetween. Here, the compression portion is a local high density portion in the present invention, and means a portion having a density higher than that of its periphery in a plan view. That is, in the high density region 43, the compressed portion 6 as a local high density portion with higher density is present. As shown in FIG. 6A, in the compression section 6 in the present embodiment, the shape of each compression section 6 is circular in a plan view of the absorbent core 40, and the plurality of compression sections are arranged in a zigzag manner. It is formed of a pattern. More specifically, in the high density region 43 d and the adjacent side regions 45, the longitudinal compression row 6 x in which the compression portions 6 are arranged in series at intervals in the longitudinal direction X of the absorbent core 40 is absorbed A plurality of rows are formed in the lateral direction of the sexing core 40, and the positions in the longitudinal direction X of the compression portions 6 of the adjacent longitudinal direction compression portion rows 6x are shifted by a half pitch. FIG. 6 (b) is a view showing another preferable example of the arrangement of the compression part 6, in which the compression part 6 is arranged in series at intervals in the longitudinal direction X of the absorbent core 40. Are formed in a plurality of rows in the lateral direction of the absorbent core 40, and the positions in the longitudinal direction X of the compression portions 6 of the adjacent longitudinal direction compression portion rows 6x coincide with each other.
The compression section 6 preferably has a circular shape in plan view, but may have a non-circular shape such as an oval, an oval, a square, a rectangle, or a triangle. In the oval and oval shapes, the length of the major axis is preferably 3.0 times or less the length of the minor axis.

In each arrangement shown in FIGS. 6A and 6B, the arrangement pitch P1 of the compression parts 6 in each longitudinal compression part row 6x is preferably 110% of the diameter L6 of the compression parts 6 The content is more preferably 120% or more, preferably 350% or less, more preferably 340% or less, and preferably 110% to 350%, more preferably 120% to 340%. Further, the arrangement pitch P2 of the longitudinal direction compressed portion row 6x in the width direction Y of the absorbent core 40 is preferably 110% or more, more preferably 120% or more with respect to the diameter L6 of the compressed portion 6 Is 350% or less, more preferably 340% or less, and preferably 110% or more and 350% or less, more preferably 120% or more and 340% or less. In addition, the diameter L6 of the compressed portion 6 is preferably 1.0 mm or more, more preferably 1.5 mm or more, and preferably 5.0 mm or less, more preferably 4.0 mm or less, and preferably 1. It is 0 mm or more and 5.0 mm or less, more preferably 1.5 mm or more and 4.0 mm or less.
When the compression section 6 has a shape other than a circle, the length of the longer one of the length in the longitudinal direction X and the length in the width direction Y of the compression section 6 is the length of the above-mentioned “diameter”. Read another. For example, in the case of an elliptical compression section inclined with respect to the longitudinal direction X, the compression section is divided into a longitudinal direction X component and a width direction Y component, and each length is the length and width of the longitudinal direction X component Let the length of the direction Y component be the length of the longer one of them be the length of the "diameter". The arrangement pitch P1 of the compression parts 6 in the longitudinal direction compression part row 6x is the length between the central points of the longitudinal direction X components of the compression parts 6 and the arrangement pitch P2 of the compression parts 6 in the width direction Y is compression The length between the center points of the horizontal direction Y component of the part 6 is assumed.

  In the napkin 1 of the present embodiment, as shown in FIG. 5, the compressed portion 6 is scattered in the same pattern in both the high density area 43d and the side area 45 adjacent to the high density area 43d. Alternatively, the compression section 6 may be formed only in the high density region 43d. In the high density region 43d, a plurality of compressed portions having different arrangement positions in the width direction Y of the absorbent core 40 are preferably formed. For example, two or more longitudinal direction compressed portion rows 6x described above are formed Is preferred.

According to the napkin 1 of the present embodiment, since the compressed portion 6 is formed in the high density region 43 d to further increase the density, the liquid discharged onto the surface sheet 11 overlapping the high density region 43 d Also, even if the viscosity of the liquid that has flowed on the surface sheet 11, in the surface sheet 11, or between the surface sheet 11 and the absorber 14 and reaches the high density region 43d is relatively high, the liquid is , Is absorbed smoothly in the high density region 43d.
Furthermore, in the napkin 1 according to the present embodiment, the compression portion 6 is formed on the surface of the side area 45 facing the skin in addition to the high density area 43 d. Even if the viscosity of the liquid discharged onto the surface sheet 11, the surface sheet 11, or the liquid flowing between the surface sheet 11 and the absorber 14 and reaching the side area 45 is relatively high. , The liquid is absorbed smoothly in the side area 45. This further improves the absorption performance for excretory fluid having a relatively high viscosity.

It is preferable that the napkin 1 have the following one or two or more structures from a viewpoint of ensuring that the one or two or more effects mentioned above are exhibited more reliably.
The basis weight of the central high basis weight region 41 is preferably 1.2 times or more of the basis weight of the side regions 45, more preferably 1.5 times or more, and preferably 3.5 times or less More preferably, it is 3.0 times or less, Preferably, they are 1.2 times or more and 3.5 times or less, More preferably, they are 1.5 times or more and 3.0 times or less. The same applies to the relationship between the basis weight of the central area 42, the central side area 43 or the thick area 44 of the central high basis weight area 41 and the basis weight of the side area 45.

  In the absorbent core 40, the high density region 43d thickness t3 is preferably 80% or less of the thickness t1 of the central region 42 or the thick region 44, more preferably 75% or less, and preferably 35 % Or more, more preferably 40% or more, preferably 35% or more and 80% or less, more preferably 40% or more and 75% or less. The thickness t3 of the high density region 43d is the thickness of the portion where the compressed groove 7 and the compressed portion 6 are not formed.

In the absorbent core 40, the density of the high density region 43d is preferably 1.20 or more, more preferably 1.50 or more times the density of the central region 42 or the thick region 44. Is preferably 3.50 times or less, more preferably 3.25 times or less, and preferably 1.20 times to 3.50 times or less, more preferably 1.50 times to 3.25 times or less .
On the other hand, the absorbent core 40 preferably has a basis weight in the high density region 43 d equal to that of the central region 42 or the thick region 44. Here, “equivalent” means that the basis weight of the high density region 43 d is 80% or more and 120% or less of the basis weight of the central region 42 or the thick region 44. The basis weight of the high density region 43 d is more preferably 90% or more and 110% or less of the basis weight of the central region 42 or the thick region 44.

The density of the side area 45 may be higher or lower than the density of the thick area 44 and may be the same, but the density of the side area 45 is 20% of the density of the thick area 44 The density is preferably 300% or less, and more preferably 30% to 200% of the density of the thick region 44.
Further, in the absorbent core 40, the thickness t5 of the side area 45 is preferably 75% or less of the thickness t1 of the central area 42 or the thick area 44, more preferably 70% or less, and preferably It is 30% or more, more preferably 35% or more, preferably 30% or more and 75% or less, more preferably 35% or more and 70% or less.
The thickness t1 of the central region 42 or the thick region 44 is preferably 1.5 mm or more, more preferably 2.0 mm or more, and preferably 8.5 mm or less, more preferably 8.0 mm or less. Moreover, Preferably they are 1.5 mm or more and 8.5 mm or less, More preferably, they are 2.0 mm or more and 8.0 mm or less.

The area ratio of the compressed portion 6 formed in the high density region 43d is preferably 6% or more, more preferably 8% or more, and preferably 25% or less, more preferably 20% or less And preferably 6% or more and 25% or less, more preferably 8% or more and 20% or less.
The area ratio of the compressed portion 6 formed in the high density region 43d is the ratio of the total area of the compressed portion to the area of the surface of the high density region 43d facing the skin, and from the high density region 43d A measurement piece having a length of 50 mm in the longitudinal direction X and a length of 7.5 mm in the lateral direction Y of the article is cut out, and the total area of the compression parts present on the surface of the surface facing the skin is measured. The value divided by the total area of the surface on the skin facing surface side is shown in percentage.

The area ratio of the compressed portion 6 formed in the side area 45 is preferably 6% or more, more preferably 8% or more, and preferably 25% or less, more preferably 20% or less And preferably 6% or more and 25% or less, more preferably 8% or more and 20% or less.
The area ratio of the compression section 6 formed in the side area 45 is the ratio of the total area of the compression section to the area of the surface of the side area 45 facing the skin, and from the side area 45 A measurement piece having a length of 30 mm in the longitudinal direction X and a length of 30 mm in the lateral direction Y of the article is cut out, and the total area of the compression parts present on the skin facing surface side of the measurement piece The value divided by the total area of the surface on the side of the surface is shown in percent.

The thickness t6 of the portion where the compressed portion 6 of the high density region 43d is formed is preferably 90% or less of the thickness t3 of the high density region 43d, that is, the thickness t3 of the portion where the compressed portion 6 is not formed. More preferably, it is 85% or less, preferably 35% or more, more preferably 40% or more, and preferably 35% or more and 90% or less, more preferably 40% or more and 85% or less.
The thickness of the portion of the side area 45 where the compressed portion 6 is formed is 80% or less of the thickness of the side area 45, that is, the thickness of the side portion 45 where the compressed portion 6 is not formed. Is more preferably 75% or less, preferably 10% or more, more preferably 20% or more, and preferably 10% or more and 80% or less, more preferably 20% or more and 75% or less.

The thickness of each portion of the absorbent core 40 is such that the absorbent core 40 or the absorbent body 14 including the absorbent core 40 is cut along the width direction of the absorbent core 40 using a razor blade, and the cut absorption The cross section of the sex core 40 is measured by applying a load of 0.5 gf / cm ² , for example, using a microscope (VHX-1000 manufactured by KEYENCE Co., Ltd.) at a magnification of 20 to 100 times.
The thickness of each part of the absorbent core 40 and the width of each part are the central position that divides the length of the central high basis weight region 41 along the longitudinal direction X of the absorbent core 40 into two equal parts (in FIG. 1 and FIG. Measurement). The density of each part is calculated from the thickness obtained by observing the cross section of the absorbent core 40 and the basis weight of the measurement piece cut out so as to include the entire thickness direction of the absorbent core.

The width W1 of the central high basis weight region 41 [see FIG. 2 (b)] is preferably 20% or more, more preferably 30% or more, of the ratio to the entire width W of the absorbent core 40. It is 95% or less, more preferably 90% or less, and preferably 20% or more and 95% or less, and more preferably 30% or more and 90% or less.
The ratio of the width W2 (see FIG. 2B) of the thick region 44 or the protrusion 5 to the width W1 of the central high basis weight region 41 is preferably 10% or more, more preferably 15% or more. Also, it is preferably 80% or less, more preferably 75% or less, and preferably 10% to 80%, more preferably 15% to 75%. The width W2 (see FIG. 2 (b)) of the thick-walled region 44 or the protrusion 5 is preferably 10 mm or more, more preferably 15 mm or more, and preferably 60 mm or less, more preferably 50 mm or less Moreover, Preferably they are 10 mm or more and 60 mm or less, More preferably, they are 15 mm or more and 50 mm or less.
The width W3 (see FIG. 2B) of the high density region 43d is preferably 2.5% or more, more preferably 5.0% or more, of the ratio to the width W1 of the central high basis weight region 41. Preferably it is 35% or less, More preferably, it is 30% or less, Moreover, preferably 2.5% or more and 35% or less, More preferably, it is 5.0% or more and 30% or less. The width W3 [see FIG. 2 (b)] of the high density region 43d is preferably 2 mm or more, more preferably 5 mm or more, preferably 20 mm or less, more preferably 15 mm or less, and preferably 2 mm It is 20 mm or less, more preferably 5 mm or more and 15 mm or less.

  The absorbent body 14 of the napkin 1 described above has, for example, a stacking drum 64 having a stacking recess 65 on the outer peripheral surface and rotating in one direction R, and an outer peripheral surface of the stacking drum 64 with a material for forming an absorbent core. As shown in FIG. 8 (a), a wide thick-walled region 41 is formed at the center in the direction CD orthogonal to the conveyance direction MD using the fiber laying device 63 (see FIG. 7) provided with the duct 69 for supplying in a scattered state. After the stacked fiber body 40A having 'is produced and covered with a core wrap sheet (not shown), the stacked body 40A is pressed as shown in FIG. 8 (b) and shown in FIG. 8 (c) It can manufacture by giving such embossing. More specifically, with respect to the example shown in FIGS. 8A to 8C, the fiber stack body 40A having a wide thick region 41 'at the central portion in the width direction CD orthogonal to the transport direction MD, After covering with a core wrap sheet, as shown in FIGS. 8 (a) and 8 (b), a press roll 171 provided with a recess 172 in a part of the peripheral surface and a flat roll 173 with a smooth peripheral surface are provided. The side portion 43 'of the wide thick region 41' is strongly pressed by being introduced between both rolls in the pressing device to form the laminate 14A having the high density region 43d, as shown in FIG. 8 (c). As shown in the figure, between the two rolls in an embossing apparatus provided with the laminated body 14A, an embossing roll 174 provided with a projecting part 175 for embossing, and an anvil roll 176 provided with a recessed part 177 in a part of the peripheral surface. By introducing The high-density regions 43d and side region 45 of the absorbent core 40 of the laminate 14A, a number of the compression section 6 is formed in a pattern shown in FIG. Thereby, the absorber 14 of the napkin 1 is obtained.

The emboss processing for forming the compression section 6 may be emboss processing in which only pressing of the workpiece is performed without heating the emboss roll and the anvil roll, or either one of the emboss roll and the anvil roll Or it may be embossing which heats and heats and pressurizes both sides.
Similarly, the press processing for forming the high density region 43d may be a press processing in which only pressing of the workpiece is performed without heating the press roll and the flat roll, or the press roll and the flat roll It may be press processing that heats and pressurizes one or both of them.
Moreover, although the case where the part used as the thick area 44 which forms the protrusion part 5 is not pressurized is shown by FIG.8 (b) and FIG.8 (c), the part used as the thick area 44, and the side Either or both of the parts to be the area 45 may be compressed weaker than the side parts 43 'to be the high density area 43d.

After laminating a belt-like surface sheet on the single-sided side from which thick region 44 of absorber 14 obtained as mentioned above protrudes, the layered product is made into shape of pressing groove 7 in the embossing device which is not illustrated. The squeezing groove 7 is formed by inserting it between an embossing roll having a ridge (corrugated part for embossing) of a corresponding shape and an anvil roll having a smooth surface disposed opposite to the embossing roll. The embossing process is preferably performed in a state in which the embossing roll temperature is heated to 100 ° C. or more and 150 ° C. or less, and more preferably in a state heated to 120 ° C. or more and 140 ° C. or less. The anvil roll is preferably performed in the state of being heated to a temperature of 70 ° C. or more and 100 ° C. or less, more preferably in the state of being heated to 80 ° C. or more and 90 ° C. or less.
The strip-like back sheet 13 and the strip-like side sheet 12 are joined to the laminate after embossing, integrated by a known method, and then cut out into an external shape of a napkin by a cutting means such as a rotary die cutter. The resulting napkin 1 is obtained. It is also preferable that the side sheets 12, 12 be bonded to both sides of the surface sheet 11 before the surface sheet 11 is joined onto the absorber 14.

As the absorbent body 14, various materials conventionally used as an absorbent body for absorbent articles can be used without particular limitation, but like the absorbent body 14 of the napkin 1 described above, an absorbent core 40, What is comprised from the core wrap sheet which wraps the said absorptive core is preferable.
The absorbent core 40 and the piled fiber 40A used for the production thereof may be, for example, a piled body of liquid absorbent fibers such as pulp fibers, or a mixed piled body of the liquid absorbent fibers and a water absorbent polymer. It may be Examples of the absorbent fibers constituting the absorbent core include cellulose fibers such as pulp fibers, rayon fibers, cotton fibers and cellulose acetate, and hydrophilic fibers. These fibers can be used alone or in combination of two or more. In addition to the cellulose-based hydrophilic fibers, polyolefin-based fibers such as polyethylene and polypropylene, and condensation-based fibers such as polyester and polyamide may be included. As a water-absorbing polymer, for example, sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, sodium polyacrylate cross-linked product, (starch-acrylic acid) graft copolymer, (isobutylene-maleic anhydride) co-polymer Polymers and saponified products thereof, polyaspartic acid and the like can be mentioned. The fiber and the water absorbing polymer may be used alone or in combination of two or more.

  The absorbent core 40 is preferably wholly or partially pulp fibers, and the ratio of pulp fibers to total fibers contained in the absorbent core 40 is preferably 50 to 100% by mass, and more preferably 80 to 80 It is 100% by mass, more preferably 100% by mass. In addition to the highly water-absorptive polymer, a deodorant, an antibacterial agent, and the like may be added to the absorbent core as necessary. In addition, the absorber 14 may be made of only the absorbent core 40.

As the core wrap sheet, water-permeable fiber sheets such as tissue paper and non-woven fabric are suitably used. The core wrap sheet may wrap the entire absorbent core in one sheet, or may wrap the entire absorbent core in two or more core wrap sheets, for example, the skin of the absorbent core The facing surface side and the non-skin facing surface side may be covered with separate sheets.
When the absorbent body 14 is composed of the absorbent core 40 and a core wrap sheet for wrapping the absorbent core, the compression section 6 described above may be provided only for the absorbent core, but the core wrap sheet Preferably, they are integrally provided on the absorbent core and the absorbent core.

  As the top sheet 11, the side sheets 12, and the non-skin side sheet 13, the same ones as those conventionally used in the relevant technical field can be used without particular limitation. For example, as the top sheet 11, a nonwoven fabric having liquid permeability or a perforated film can be used. As the side sheet 12, a water-repellent non-woven fabric having high water pressure resistance, for example, a spunbond-meltblown-spunbond laminated non-woven fabric can be used. As the non-skin side sheet 13, a water-impervious non-woven fabric having high water pressure resistance such as a liquid impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated non-woven fabric can be used.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the embodiments.
For example, the side pressing groove 71 may have the first portion 71b overlapping the central side area 43 not only at two places but only at one place, or at three places or more. Further, the width of the central region 42 may be the same as the width W2 of the thick region 44, and the width of the central side region 43 may be the same as the width W3 of the high density region 43d.
Further, the compression part 6 may be formed only in the high density region 43 d and may not be formed in the side region 45. Also, the compression unit 6 may not be present at all.
Further, in the absorbent core 40 shown in FIG. 5, a rectangular region 6N in which the compression portion 6 is not formed is formed at the central portion in the width direction Y. The region 6N is a part of the front portion A A region 6N may extend over the entire length of the absorbent core 40 in the longitudinal direction X, although the region 6N extends from the rear portion to a part of the rear portion. Further, the thick region 44 may have a protrusion that protrudes to the skin facing surface P side. The skin-side sheet may be entirely composed of a liquid-permeable surface sheet.

  In addition to the sanitary napkin, the absorbent article of the present invention may be other absorbent articles such as panty liners (crims sheets), incontinence pads, disposable diapers and the like. Examples of the body fluid to be absorbed by the absorbent article include menstrual blood, droppings, loose stools, urine, saliva, blood and the like.

1 Sanitary napkin (absorbent article)
Reference Signs List 10 skin side sheet 11 surface sheet 12 side sheet 13 non-skin side sheet 14 absorber 40 absorbent core 41 central high basis weight area 42 central area 43 central side area 43 d high basis weight area 44 thick area 45 lateral area 46 Through hole 5 Protrusion part 6 Compression part (local high density part)
7 squeeze groove
71 side pressing groove 71b first portion 71a front second portion (second portion)
71c Rear second part (second part)
71b front second portion 71b side pressing groove 71b rear second portion 71d width direction overlapping portion 72 front pressing groove 73 rear pressing groove 74, 75 pressing groove 15 absorbent main body 17 wing portion 18 rear flap portion

Claims (9)

Absorbent comprising a skin-side sheet forming the skin-facing surface, a non-skin-side sheet forming the non-skin-facing surface, and an absorbent body including an absorbent core, and having a front portion, a discharge portion facing portion and a rear portion in the longitudinal direction An article,
In the skin-side sheet, a portion overlapping with the absorbent core includes a liquid-permeable top sheet,
The absorbent core has a long shape in the longitudinal direction of the absorbent article, and a pair of side regions forming both sides of the absorbent core at the excretory part facing portion, and the pair of side regions And a central high basis weight region located between and having a larger basis weight than the respective side regions,
The central high basis weight region is divided into seven central regions when the absorbent core is divided into seven regions by equally dividing the length in the width direction of the absorbent core at the excretory part facing portion into seven regions. In
The excretion portion facing portion has on the skin facing surface a pair of side leakage preventing grooves extending in the longitudinal direction of the absorbent core in which the surface sheet and the absorber are integrally recessed,
When the central high basis weight area is divided into two parallel straight lines dividing the maximum width into three equal parts into a central area and a central side area, the respective side leakage leakage grooves are formed by the central side Straddling the area and the lateral area, and not in the central area,
An absorbent article, wherein at least the central region of the central high basis weight region is thicker than at least a part of a portion where the side leakproof groove is not formed in the side region.   The absorbent article according to claim 1, wherein at least the central area in the central high basis weight area forms a protruding portion that protrudes to the surface on the skin facing surface side.   Each of the lateral leak-proof grooves is a first portion overlapping the central side region, and a second portion which obliquely extends from the first portion with respect to the longitudinal direction of the absorbent core and is positioned on the lateral region. The absorbent article of Claim 1 or 2 which has a part.   Each of the side leakproof grooves has, as a second part, a front second part located forward of the first part and a rear second part located rearward of the first part. The absorbent article as described in 3.   The respective lateral leak-proof groove according to claim 4, wherein the plurality of first portions and the front second portion and the second rear portion respectively formed corresponding to the plurality of first portions. Absorbent articles.   The absorption according to any one of claims 1 to 5, wherein a plurality of through holes penetrating the absorber, or the surface sheet, and the absorber are formed in the central region of the central high basis weight region. Sex goods.   The pair of side leak-proof grooves extend to one or both of the front portion and the rear portion continuously or with a widthwise overlapping portion between the other leak-proof grooves. The absorbent article according to any one of claims 1 to 6.   The central side area has a high density area higher in density than the side area and the central area, and the respective side leak leakage grooves straddle the high density area and the side area. The absorbent article according to any one of claims 1 to 7, which is formed as follows.   The local area of high density in the high density region, which is recessed toward the non-skin facing surface side from the skin facing surface side, is formed in a scattered dot shape with an interval therebetween. The absorbent article as described.

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