JP6365406B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article including an absorbent main body in which an absorber is disposed between a liquid-impermeable back sheet and a top sheet.

It has an absorbent body with an absorbent body between a liquid-permeable top sheet and back sheet, such as diapers for children or adults, feminine hygiene products, light-moderate incontinence pads, and pet excretion disposal products. Various absorbent articles are known. In such an absorbent article, the absorbent body for absorbing and retaining liquids such as urine, mainly fluff pulp and highly absorbent resin, i.e., is the mixture of SAP (S uper a bsorbent p olymer ) It is comprised with an absorptive core and core coating materials, such as the tissue which wraps this absorptive core.

  For such absorbent articles, lightweight and compact products called ultra-thin or ultra-thin are required from the viewpoint of saving resources, reducing logistics costs, and improving shelf efficiency at retail stores. This is becoming the current mainstream. The greatest point at which such an ultra-thin absorbent article can be realized is to reduce the weight of the absorbent body itself, which occupies most of the weight and volume of the absorbent article, and to make it compact. That is, the thinning of the absorbent core made of a mixture of fluffy pulp and SAP is realized by increasing the relative content of SAP or using sheet-like SAP instead of the mixture.

  However, when the relative content of SAP in the absorber is increased or the thickness of the absorber is reduced using sheet-like SAP instead of the mixture, the SAP content is set higher than about 50 to 60%. Is basically difficult. The reason for this is the gel blocking phenomenon and absorption characteristics of SAP, and it is particularly problematic because it has a high absorption retention property of SAP, but its absorption speed, particularly the rising speed of absorption is slow. . For example, although the discharge rate of urine varies depending on individual differences, sex differences, age differences, etc., in the earliest example, 100 cc of urine is discharged in about 10 seconds. On the other hand, even if the absorption rate of SAP is improved, it takes a time of at least 30 seconds from the contact of the liquid to the state where the absorption capacity is fully exhibited. Due to such a large speed difference existing between the urine discharge rate and the liquid absorption rate by the SAP constituting a part of the absorber, most of the urine remains unabsorbed immediately after urine discharge. It will stay in the absorptive main body. This free movement of unabsorbed urine within the absorbent main body is a major cause of leakage of urine from the absorbent article.

  For this reason, a compression recess is formed on the surface of the absorbent body for rapidly inducing and urinating urine from the crotch region of the absorbent main body from which urine is discharged to the front body region and the rear body region of the absorbent main body. A technique for suppressing urine leakage is proposed in Patent Document 1 and the like.

  On the other hand, as the SAP content in the absorber is increased, the flexibility of the absorber itself tends to be lost. In the crotch region of the absorbent main body, a large torsional force is applied by the movement of the wearer of the absorbent article, particularly the movement of both legs, and thus the suppleness of the absorbent body is impaired. It leads to increase. Therefore, a technique in which lattice-shaped compressed grooves are formed on the surface of the absorbent main body, and the absorbent main body is easily bent from these compressed groove portions following the torsional force applied to the absorbent main body is cited in Reference 2. Etc. are proposed.

JP 2012-143535 A JP2015-16218A

  The pressing recesses proposed in Patent Document 1 and the pressing grooves proposed in Patent Document 2 can usually be formed on the surface of the absorbent main body using an embossing technique. That is, a forming roll having a shape complementary to the pressing recess and pressing groove on the outer peripheral surface and a flat roll having a flat outer peripheral surface are arranged at appropriate intervals so that their rotational axes are parallel, The absorptive main body is fed and passed between them while rotating them synchronously. At this time, a part of the surface of the absorbent main body is plastically deformed by the forming roll, so that a pressing recess and a pressing groove are formed.

  However, when the grid-shaped compressed grooves disclosed in Patent Document 2 are formed on the surface of the absorbent main body, even if the forming depth by the forming roll is set uniformly, the depth of the obtained compressed grooves depends on the location. It turned out to be different. More specifically, the intersection portion of each lattice is more strongly plastically deformed than the other portions, and the depth of the compressed groove is deeper than the lattice portion in the middle of each intersection. The covering surface sheet might be torn by shearing. Further, since the intersection portion of the lattice causes stronger plastic deformation, the rigidity of the absorber at this intersection portion becomes too higher than the surroundings, and the touch tends to deteriorate when worn.

  An object of the present invention is to form a grid-shaped recess for ensuring flexibility and to have a uniform depth, and the surface sheet is not torn at the time of forming the recess, so that rigidity is provided over the entire area of the recess. The object is to provide an absorbent article that can be maintained substantially constant.

  An absorbent article according to the present invention has an absorbent main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and a sheet-like absorbent body arranged between the top sheet and the back sheet. An absorbent article in which a plurality of recesses are formed on the surface of the absorbent body on the surface sheet side, at any position that crosses the recesses along the width direction of the absorber, The sum of the lengths of the recesses along the width direction of the absorber is the same.

  Here, the expression “the sum of the lengths of the recesses is the same” means that the object of the present invention described above is considered in consideration of uneven physical properties, dimensional errors and embossing errors associated with manufacturing errors of the absorbent main body. It is meant to be the same to the extent that it can be achieved. In addition, the “width direction of the absorbent body” means a direction parallel to the rotation axis of the molding roll when the concave portion is embossed on the absorbent body of the absorbent main body together with the top sheet, and the concave portion is embossed using the molding roll. When processing, the molding pressures of the individual recesses, that is, the linear pressures are all the same.

  In the absorbent article according to the present invention, the individual recesses include a first pattern extending in a first direction intersecting with the longitudinal direction of the absorbent body, and a first pattern with respect to the longitudinal direction of the absorbent body. Has a second pattern extending in a second direction intersecting in the opposite direction, and a plurality of these first patterns and second patterns are arranged along the longitudinal direction of the absorber. May be.

  The “longitudinal direction of the absorbent body” is a direction orthogonal to the “width direction of the absorbent body”, that is, the rotation axis of the forming roll when embossing the recesses in the absorbent body of the absorbent main body together with the topsheet. It means the direction perpendicular to the direction.

  Each of the first patterns is formed by discontinuously arranging a plurality of recesses, and each of the second patterns is formed by discontinuously arranging a plurality of recesses. Good. Alternatively, each of the first patterns is formed by a single recess extending in the first direction, and each of the second patterns is formed by a single recess extending in the second direction. Each may be formed.

  It is preferable not to form a recess in the periphery of the absorber and in the vicinity thereof.

  The absorbent article may be a urine absorbent pad. In this case, the absorbent main body is disposed on both sides in the width direction of the surface sheet so as to overlap the surface sheet, and a pair of side sheets whose outer edges in the width direction are joined to the back sheet, and the pair of side sheets. And an elastic member disposed in an extended state along the longitudinal direction of the side sheet.

  A pair of side sheets disposed on both sides in the width direction of the absorbent main body so as to overlap the top sheet, and a pair of side sheets whose outer edges in the width direction are bonded to the exterior sheet; An elastic member arranged in an extended state along the longitudinal direction of the side sheet may be further provided at the inner edge in the width direction of the side sheet.

  According to the absorbent article of this invention, when embossing a recessed part using a forming roll, all the molding pressures of each recessed part can be made the same. As a result, the surface sheet is not torn due to a change in molding pressure during molding of the recess, and the rigidity can be made substantially uniform over the entire area of the recess to be molded.

  When each of the concave portions has a first pattern and a second pattern intersecting with the first pattern, and a plurality of these two patterns are arranged along the longitudinal direction of the absorbent body, particularly with respect to twisting The flexibility of the absorbent main body can be improved.

  When each of the first and second patterns is formed by discontinuously arranging a plurality of recesses, the rigidity of the absorbent main body that increases with the formation of the recesses can be reduced.

  When each of the first and second patterns is formed by a single recess extending in the first and second directions, respectively, the recess functions as a guide path for liquid such as urine, and the liquid is more It becomes possible to diffuse quickly.

  When the concave portion is not formed in the periphery of the absorbent body and the vicinity thereof, it is possible to prevent a problem that the liquid guided to the vicinity of the peripheral edge of the absorbent main body by the concave portion overflows from the peripheral edge of the absorbent main body.

  When the absorbent article is a urine absorbing pad, the absorbent main body further includes a pair of side sheets, and an elastic member arranged in an extended state on the inner edges of the side sheets in the width direction. The side sheet can be made to function as a three-dimensional gather for preventing the above.

It is a three-dimensional projection figure showing typically the appearance of one embodiment which applied the absorptive article by the present invention to a pants type disposable diaper. It is a partially broken top view of the state which broke and expanded the closing part of embodiment shown in FIG. It is the stereographic projection figure which decomposed | disassembled the diaper of the expansion | deployment state shown in FIG. It is sectional drawing along the IV-IV arrow in FIG. It is an enlarged plan view of the absorptive main body in embodiment shown in FIG. 1, and has shown in the state which removed the side sheet | seat. It is the top view which extracted and expanded the arrow VI part in FIG. It is an expanded sectional view in alignment with the VII-VII arrow in FIG. It is a top view of an absorptive main part by other embodiments of an absorptive article by the present invention. It is a top view of the absorptive main part by another embodiment of the absorptive article by the present invention.

  An embodiment in which an absorbent article according to the present invention is applied to a pants-type disposable diaper will be described in detail with reference to FIGS. However, the present invention is not limited to such an embodiment, and various changes and modifications included in the concept of the present invention described in the claims are possible.

  The external appearance of the pants-type diaper according to the present embodiment is shown in FIG. 1, the external appearance in a state where the closed portion is broken and the inner side is shown in FIG. 2 is shown, and the external appearance in a state where this is further disassembled FIG. 4 schematically shows a cross-sectional structure shown in FIG. 3 and taken along arrows IV-IV in FIG. That is, a pants-type disposable diaper (hereinafter simply referred to as a diaper) 10 in the present embodiment includes an exterior member 13 in which a waist circumference opening 11 and a pair of left and right leg circumference openings 12 are formed, and the exterior member The main part is comprised by the absorptive main body 14 distribute | arranged to 13 inside.

  The exterior member 13 includes a liquid-impermeable outer sheet 15, an inner sheet 16 that touches the wearer's skin, a waist elastic member 17, and a pair of left and right leg elastic members 18. The waist elastic member 17 and the pair of left and right leg elastic members 18 are arranged in an extended state between the outer sheet 15 and an inner sheet 16 formed of a nonwoven fabric having substantially the same size and shape as the outer sheet 15. The The waist circumference opening 11 corresponding to the waist portion of the wearer is squeezed by the waist circumference elastic member 17, and a waist gather 11g is formed here. Similarly, the pair of left and right leg openings 12 corresponding to the thigh portions of the wearer's legs are respectively squeezed by the pair of left and right leg elastic members 18, and leg gathers 12g are formed therein.

  A pair of left and right closing portions 19 connected to the waist opening 11 and the leg opening 12 are formed on the left and right edges of the exterior member 13 in the front body region 10F and the back body region 10B of the diaper 10. ing. From the unfolded state shown in FIG. 2, the front and rear closing portions 19 of the exterior member 13 are superposed on each other, and these contact portions are individually subjected to a hot melt bonding method, a pressure melting bonding method, or an ultrasonic melting bonding method. Or it joins combining suitably. Thereby, the diaper 10 as shown in FIG. 1 in which the waist opening 11 and the pair of left and right leg openings 12 are formed can be obtained.

  The absorbent main body 14 in the form of an elongated rectangular sheet extends from the front body region 10F of the diaper 10 through the crotch region 10G between the left and right leg openings 12 to the back body region 10B. The absorbent main body 14 in this embodiment includes a liquid-impermeable back sheet 20, a liquid-permeable top sheet 21 having a slightly smaller size and shape than the back sheet 20, and an elongated sheet-shaped absorber 22. And a main part is comprised by the left-right paired side sheet | seat 23. As shown in FIG. In addition, although the side sheet | seat 23 in this embodiment has liquid impermeability, it is not limited to this.

  The back sheet 20 is joined in a state of being superimposed on the inner sheet 16 of the exterior member 13, and the absorbent body 22, the top sheet 21, and the side sheets 23 are sequentially stacked thereon. Although the absorber 22 is normally comprised with the absorptive core which is a mixture of a fluffy pulp and SAP, and core coating materials, such as the tissue which wraps this absorptive core, it is not limited to this. Further, the contour shape of the absorber 22 is not limited to a rectangle as in the present embodiment, and any contour shape can be appropriately employed depending on the purpose. The outer peripheral edge of the topsheet 21 that covers the entire absorber 22 is joined to the outer peripheral edge of the backsheet 20. Further, the left and right side edge portions of the side sheet 23 are joined to the side edge portions of the back sheet 20, and both longitudinal end edges of the side sheet 23 are joined to both longitudinal end edges of the back sheet 20. . Therefore, the inner portions (in the center side in FIG. 2) of the pair of left and right side sheets 23 that cover the left and right sides of the top sheet 21 are not joined to the top sheet 21. In order to form the three-dimensional gather 23g by this inner portion, the rubber thread 24 is joined to the inner edge of the side sheet 23 in an extended state.

  Therefore, in a state where such a diaper 10 is worn, urine and feces are guided onto the surface sheet 21 of the absorbent main body 14, and moisture passes through the surface sheet 21 and is absorbed by the absorber 22. .

The planar shape of the absorbent main body 14 in this embodiment is shown in FIG. 5, the arrow VI part is extracted and enlarged and shown in FIG. 6, and the cross-sectional shape along the arrow VII-VII in FIG. Although shown in FIG. 7, the side sheet | seat 23 is abbreviate | omitted and drawn in FIG. 5 and FIG. A plurality of recesses 25 are formed on the surface of the absorbent main body 14, that is, on the surface sheet 21 side opposite to the back sheet 20. The plurality of recesses 25 are formed on the absorbent body 22 together with the surface of the absorbent main body 14, that is, the surface sheet 21 by a well-known embossing process using a forming roll having a shape complementary to the recess 25 on the outer peripheral surface. The Each recessed part 25 in this embodiment has two types of parallelograms opposite to each other, each having an inclination angle of 45 degrees with respect to the width direction of the absorbent main body 14 (the left-right direction in FIG. 5). . One type of recess 25 _A forms a first pattern extending along a first direction O _A inclined by 45 degrees with respect to the longitudinal direction of the absorber 22 (vertical direction in FIG. 5), The first patterns are arranged in parallel at predetermined intervals along the longitudinal direction of the absorber 22. The other type of recesses 25 _B forms the second pattern extending along a second direction O _B perpendicular to the first pattern with respect to the longitudinal direction of the absorbent body 22, the second pattern Are arranged in parallel at predetermined intervals along the longitudinal direction of the absorber 22. Each of the first and second patterns in the present embodiment is formed by discontinuously arranging a plurality of concave portions 25 _A and 25 _B.

In the present embodiment, regions where a plurality of recesses 25 are formed and regions where no recesses 25 are formed are arranged alternately along the longitudinal direction of the absorbent main body 14. In addition, at any position that crosses the recess 25 along the width direction of the absorber 22, the total length W of the recess 25 along the width direction of the absorber 22 is set to be the same at any position. Has been. For example, the total length W of the recesses 25 along the width direction of the absorber 22 at the position P ₁ in FIG. 6 is 6 W, and the length of the recesses 25 along the width direction of the absorber 22 at the position P _2. The total of W is also 6W. Thereby, when embossing the recessed part 25 using a forming roll, the molding pressure of each recessed part 25, ie, linear pressure, can all be made the same, and the depth of each recessed part 25 becomes uniform. As a result, the surface sheet 21 is not torn due to a change in molding pressure when the recess 25 is molded, and the rigidity of the absorbent main body 14 can be made substantially uniform over the entire area of the recess 25 to be molded.

The spacing of the recesses 25 _A arranged along the first direction O _A, the first adjacent along the direction O _A recess 25 _A between the regions Z _A surface is embossed sheet 21 and the absorber 22 It is set so as to form a continuous groove shape along the first direction O _A by being depressed by the compression deformation. Similarly, the spacing of the plurality of recesses 25 _B arranged along the second direction O _B also topsheet regions Z _B between the recess 25 _B which are adjacent to each other along the second direction O _B is embossed 21 and depressions hung pulling the compressive deformation of the absorbent body 22, is set so as to form a groove shape continuous in the second direction O _B. In the present embodiment, the concave portion 25 is not formed in the region Z _C where the first pattern and the second pattern intersect, but as described above, this is a groove-like depression. When the thickness T of the absorbent main body 14 before forming the recess 25 is 100, the thickness T _{C of the} recess 25 is set to approximately 15 to 45. The first and second directions O _A, between the recess 25 _A respectively adjacent along the O _B, to be set, respectively, as the thickness T _M of the region between 25 _B is approximately 30-70 longitudinal Although preferable, it is not limited to this.

  Accordingly, when a force that twists in the opposite direction around the longitudinal axis is applied to both ends in the longitudinal direction of the absorbent main body 14, the depressions that form a rectangular groove lattice on the surface of the absorbent main body 14 are absorbent. It becomes a deformation promotion region of the main body 14. That is, the followability of the crotch region of the absorbent main body 14 with respect to the movement of both legs of the wearer of the diaper 10 is improved, and the uncomfortable feeling accompanying wearing can be reduced. Moreover, by forming the first and second patterns by the plurality of recesses 25 into the groove shape as described above, it is possible to quickly guide the liquid such as urine from the central region to the edge region of the absorber 22. It can also function as a passage.

  In addition, since the liquid induced | guided | derived here may leak from the periphery of the absorber 22, when the recessed part 25 is formed to the periphery of the absorber 22, in this embodiment, it is a recess in the periphery of the absorber 22 and its vicinity. 25 is not formed.

  In the present embodiment, the arrangement intervals of the first and second patterns along the longitudinal direction of the absorber 22 are set to be equal so that a square lattice pattern is formed by the first and second patterns. However, the present invention is not limited to this. In addition, the first and second patterns are inclined by 45 degrees with respect to the longitudinal direction of the absorber 22, but the present invention is not limited to this, and the inclination angle may be in the range of approximately 30 degrees to 60 degrees. It can be said that it is preferable to obtain the effects of the invention favorably.

In the above-described embodiment, the first and second patterns are formed by discontinuously arranging the plurality of recesses 25 _A and 25 _B , respectively, but these extend in the first and second directions, respectively. It is also possible to form each by a single recess.

Such a planar structure of another embodiment of the absorbent main body 14 according to the present invention is schematically shown in FIG. That is, in the embodiment, are respectively formed by a single recess 25 _A, 25 _B extending in a first pattern and a second first pattern, respectively, and the second direction O _A, O _B, the first and is inclined 45 degrees respectively with respect to the longitudinal direction of the second direction O _a, it absorbs O _B of the body 14. Then, at any position across the recess 25 along the width direction of the absorber 22, the sum where the position of the length W of the recessed portion 25 along the width direction of the absorber 22, for example, P ₃ to P ₅ However, it is set to be the same 4W. More specifically, square-shaped or right-angled isosceles triangular recesses 25 _M are formed one by one or two at the center of the groove grating defined by the first and second patterns. The square-shaped concave portion 25 _M has the same shape as the region Z _C where the first and second patterns overlap, and the right-angled isosceles triangular concave portion 25 _M has the square-shaped concave portion 25 _M at the diagonal portion. It is the same as the shape divided into two.

  Thereby, all the linear pressures at the time of embossing the recess 25 using a forming roll can be made the same, and the depth of each recess 25 becomes uniform. As a result, the surface sheet 21 is not torn due to a change in molding pressure when the recess 25 is molded, and the rigidity of the absorbent main body 14 can be made substantially uniform over the entire area of the recess 25 to be molded.

Note that the position of each concave portion 25 _M only needs to be at a position where the intersection areas Z _C of the first and second patterns forming a lattice shape are arranged along the width direction of the absorber 22. Thus, there is no necessity to form the central portion of the lattice. Also in the present embodiment, the liquid can be rapidly diffused over the entire area of the absorber 22 by using the groove-shaped recess 25 to guide the liquid from the central region of the absorber 22 to these peripheral portions. In addition, it is possible to ensure followability with respect to torsion acting on the absorbent main body 14.

  In the embodiment shown in FIGS. 5 to 7, the recesses 25 are not formed at the intersections of the groove lattices aligned in the width direction of the absorbent body 14, but the grooves aligned in the longitudinal direction of the absorbent body 14. It is also possible to prevent the concave portions 25 from being formed in the intersection area of the lattice.

A planar structure of still another embodiment of such an absorbent main body 14 is schematically shown in FIG. 9, and the same reference numerals are given to elements having the same functions as those of the previous embodiment. In the present embodiment, the plurality of recesses 25 are formed in a corrugated shape extending along the longitudinal direction of the absorbent main body 14, and the first pattern and the second pattern are alternately formed. Therefore, the to be intermittently formed along the first and second patterns are first and second directions O _A, respectively, O _B. In the present embodiment, at any position P _n along the width direction of the absorber 22, the total length W of the recesses 25 along the width direction of the absorber 22 is the same 4 W at any position. The width d of the continuous recess 25 is continuously changed along the longitudinal direction of the absorber 22.

  Also in this embodiment, the liquid is guided over the entire area of the absorber 22 by guiding the liquid from the longitudinal center portion of the absorber 22 to the both ends in the longitudinal direction using the continuous groove-shaped recess 25. Can diffuse quickly. Moreover, it is the same as that of previous embodiment that the followability with respect to the twist which acts on the absorptive main body 14 can also be ensured.

  The absorbent article according to the present invention is not limited to the above-described pants-type disposable diaper, but can be applied to various absorbent articles such as a tape-type disposable diaper and a urine leak pad. For example, when the present invention is applied to a urine leak pad, the above-described absorbent main body 14 can be used as it is as a urine leak pad, that is, an absorbent article. As described above, the present invention should be construed only from the matters described in the scope of the claims, and in the above-described embodiments, the matters described in all the changes and modifications included in the concept of the present invention are described. Other than possible. That is, all matters in the above-described embodiments are not intended to limit the present invention, and can be arbitrarily changed according to its use, purpose, and the like, including configurations not directly related to the present invention. Is.

10 Diapers (pants-type disposable diapers)
DESCRIPTION OF SYMBOLS 13 Exterior member 14 Absorbent main body 20 Back surface sheet 21 Top surface sheet 22 Absorber 23 Side sheet 23g Solid gather 24 Rubber thread 25 Recessed portion 25 _A Recessed portion arranged in first direction 25 _B Recessed portion arranged in second direction 25 _M crossing the recess along the width direction of the recess O _a first direction O _B second length of the recess along the width direction of the direction W absorber P ₁ to P ₅ absorber is formed separately from the groove grating Arbitrary position Z _C Area where the first pattern and the second pattern intersect

Claims (3)

A liquid-permeable surface sheet;
A liquid-impermeable back sheet,
An absorbent body comprising an absorbent body having a sheet-like absorbent body arranged between the top sheet and the back sheet, and having a plurality of recesses formed on the surface sheet side surface of the absorbent body A sex product,
Each of the recesses has a first pattern extending in a first direction intersecting the longitudinal direction of the absorber, and a direction opposite to the first pattern with respect to the longitudinal direction of the absorber. A second pattern extending in the intersecting second direction, and a plurality of these first patterns and second patterns are arranged along the longitudinal direction of the absorber,
The absorbent article, wherein the total length of the recesses along the width direction of the absorber is the same at any position across the recess along the width direction of the absorber. Each of the first patterns is formed by arranging a plurality of concave portions in a broken line shape , and each of the second patterns is formed by arranging a plurality of concave portions in a broken line shape . The absorbent article according to claim 1 .   The absorbent article according to claim 1, wherein the concave portion is not formed on a peripheral edge of the absorber and in the vicinity thereof.

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