JP6695668B2 - Absorbent article - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between them.

Various absorbent articles such as children's or adult's diapers, feminine sanitary products, light and moderate incontinence pads, pet excrement disposal products with an absorbent body interposed between the liquid-permeable top sheet and back sheet are available. Are known. In such an absorbent article, the absorbent body for absorbing and retaining liquids such as urine, mainly fluff pulp and high absorbent resin (S uper a bsorbent p olymer) , i.e. a mixture of the SAP It is composed of an absorbent core and a core covering material such as a tissue that wraps the absorbent core.

  For such absorbent articles, from the viewpoint of resource saving, reduction of distribution costs, improvement of shelf efficiency in retail stores, etc., lightweight and compact products called ultra-thin or ultra-thin are required. , This is becoming the current mainstream. The greatest point that can realize such an ultra-thin absorbent article 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 absorber, the main part of which is composed of a mixture of fluffy pulp and SAP, is realized by increasing the relative content ratio of SAP or by using sheet SAP instead of the mixture. There is.

  However, when the relative content of SAP in the absorber is increased or the absorber is thinned by using a sheet-like SAP instead of the mixture, the content of SAP is set to be higher than about 50 to 60%. Is basically difficult. The reason lies in the gel block phenomenon and the absorption characteristics of SAP, and is particularly problematic because the absorption retention of SAP is high, but the absorption rate, especially the rising speed of absorption, is slow. .. For example, although the excretion rate of urine and the like varies depending on individual differences, sex differences, age differences, etc., in the earliest example, 100 cc of urine is excreted in about 10 seconds. On the other hand, even if the absorption rate of SAP is improved, at least 30 seconds or more is required from the time when the liquid comes into contact with the liquid to a state where the absorption capacity is sufficiently exhibited. Due to such a large speed difference between the excretion rate of urine and the absorption rate of liquid by SAP that constitutes a part of the absorber, most of the urine remains unabsorbed immediately after the excretion of urine. It will stay in the absorber. The free movement of unabsorbed urine in the absorbent body is a major cause of leakage of urine from the absorbent article.

  From this, from the crotch region of the absorbent body where urine is discharged, a squeezing concave portion is formed on the surface of the absorbent body for promptly inducing and diffusing urine into the front body area and the back body area of the absorbent body. A technique for suppressing urine leakage is proposed in Patent Document 1 and the like.

  On the other hand, as the content of SAP in the absorber is increased, the flexibility of the absorber itself tends to be lost. Since a large twisting force is applied to the crotch region of the absorbent body by the movement of the wearer of the absorbent article, particularly the movement of both legs, the suppleness of the absorbent body is impaired, which increases an uncomfortable feeling when the absorbent article is worn. Lead to Therefore, a technique in which a lattice-shaped compressed groove is formed on the surface of the absorber so that the absorbent body is easily bent from the portion of the compressed groove by following the twisting force applied to the absorbent body is proposed in Cited Document 2 or the like. Has been done.

JP2012-143535A JP, 2015-16218, A

  By the way, in order to prevent the groove from sagging even when a pressure due to the weight of the wearer is applied, the present inventor has made the top sheet (top sheet) side arranged on the skin contact surface side of the absorbent body from the top sheet (top sheet) side The sheet and the absorbent body were compressed together to form a compression groove that is more resistant to fatigue. In this case as well, as described above, the compression groove is formed by rotating the embossing roll on the absorber on which the top sheet is laminated. When the compression groove is formed in this manner, the top sheet or the like located above the absorber is dented toward the groove by pressing the embossing roll. In particular, an embossed pattern having an obliquely extending component such as a diagonal grid pattern has a portion where the distance between points that are simultaneously compressed, such as near a grid point, becomes short (the interval becomes narrow). When the distance between the points compressed at the same time is short, the force of pulling the topsheet from both adjacent compression points works strongly, and the topsheet tends to be in a strongly stretched state.

  Since the compression groove itself is at a lower position than the uncompressed part, it does not touch the wearer's skin directly, but the top sheet and the absorber are close to the intersections (lattice points) of the lattice, that is, near the corners of the lattice. It is fixed in a pulled and strongly stretched state. Therefore, the powdery SAP in the absorber may hit the topsheet. Then, in the vicinity of the corners of the grid on the skin contact surface of the top sheet, the rough feeling of the highly liquid-absorbent resin is transmitted as a touch, and becomes harder than other parts.

  Since the vicinity of the corners of this lattice is located higher than the bottom of the compression groove, it is not preferable because it touches the wearer's skin and gives the wearer a firm hardness and a rough feel. Since the absorbent article comes into contact with delicate skin such as the crotch, soft touch is required, and if the corners of the lattice are hard, the touch to the skin is not preferable.

  On the other hand, since the top sheet is the skin-contacting surface of the wearer, it is a place that the wearer can easily observe when wearing the top sheet. If the embossed pattern does not have regularity or design, the aesthetic effect is low, and in some cases, the wearer may mistakenly recognize it as wrinkles due to manufacturing defects.

  An object of the present invention is to form a visually excellent embossed pattern having a component that extends in a diagonal direction by compressing the top sheet and the absorber together, and to give a soft touch even in the vicinity of an intersection where the components that extend in a diagonal direction intersect. An object is to provide an absorbent article that can be given to a wearer.

  An absorbent article according to the present invention having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber arranged between the topsheet and the backsheet is an absorbent article facing the topsheet. A first recess formed on the surface of the body and extending along a first direction; and a first recess formed on the surface of the absorbent body facing the top sheet in an intersecting state with the first recess, A second recess extending along a second direction different from the first direction, wherein the first recess and the second recess have a depth from a surface of the absorber to a bottom surface thereof. It is characterized by having a shallow first region and a second region in which the depth from the surface of the absorber to the bottom surface thereof is deeper than that of the first region.

  In the present invention, the first region having a shallow depth from the surface of the absorber to the bottom surface thereof facilitates the deformation of the absorber against external stress such as twisting, while the first region from the surface of the absorber to the bottom surface thereof. The second region having a large depth suppresses the deformation of the recess.

  The absorbent article according to the present invention may further include a third recess formed in an intersecting region of the first recess and the second recess. In this case, the third recess may be discontinuous with respect to the first recess and the second recess.

  Further, the absorber may have a recessed portion non-forming region in which the first recessed portion, the second recessed portion and the third recessed portion are not formed in the peripheral portion thereof.

  The first recess, the second recess, and the third recess can be formed in the top sheet integrally with the absorber.

  The absorber may have an undeformed region between the third recess and the first recess and the second recess adjacent to the third recess.

  A plurality of the first recesses may be arranged at a predetermined interval along the second direction, and a plurality of the second recesses may be arranged at a predetermined interval along the first direction.

  According to the absorbent article of the present invention, the first and second recesses formed on the surface of the absorbent body have first and second regions having different depths from the surface of the absorbent body to the bottom surface thereof, respectively, It is possible to suppress the deformation of the recess while maintaining the followability to the movement of the wearer's body.

  When a third recess formed in the intersecting region of the first recess and the second recess is further provided, diffusion of liquid such as urine can be promoted. In particular, when the third concave portion is discontinuous with the first concave portion and the second concave portion, the texture of the region of the absorber surrounding the third concave portion can be kept good.

  When the absorbent body has a recessed portion non-forming region in which the first recessed portion, the second recessed portion, and the third recessed portion are not formed in its peripheral portion, liquid such as urine that diffuses through the recessed portion throughout the absorber is absorbed. It is possible to prevent leakage from the peripheral portion of the.

  When the first recess, the second recess, and the third recess are formed in the top sheet integrally with the absorber, it is possible to prevent the recesses from losing their shape.

  When the absorber has an undeformed region between the third recess and the first recess and the second recess adjacent to the third recess, the texture in the intersecting region of the first recess and the second recess is good. Can be kept at

  When a plurality of first recesses are arranged at a predetermined interval along the second direction and a plurality of second recesses are arranged at a predetermined interval along the first direction, these are formed into a lattice form having an excellent appearance. can do.

FIG. 1 is a perspective view showing the appearance of an embodiment in which the absorbent article according to the present invention is applied to a tape-type disposable diaper. FIG. 2 is a partially cutaway plan view of the developed state of the tape-type disposable diaper shown in FIG. 1 as seen from the skin contact surface side. FIG. 3 is a stereoscopic projection view showing the tape type disposable diaper shown in FIG. 2 in an exploded state. FIG. 4 is a sectional view taken along the line IV-IV in FIG. FIG. 5: is the top view which expanded the part of the absorber of the tape type disposable diaper shown in FIG. FIG. 6 is a plan view in which a part of the absorber shown in FIG. 5 is further extracted and enlarged. FIG. 7 is a sectional view taken along the line VII-VII in FIG. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.

  An embodiment in which the absorbent article according to the present invention is applied to a tape-type disposable diaper will be described in detail with reference to FIGS. 1 to 9. However, the absorbent article according to the present invention is not limited to such a tape-type disposable diaper, and a liquid-permeable topsheet such as a pants-type disposable diaper or a urine leakage pad, a liquid-impermeable backsheet, and these tops. It is applicable to various absorbent articles having an absorbent body arranged between the sheet and the back sheet.

  FIG. 1 shows the appearance of the tape-type disposable diaper according to the present embodiment in use, and FIG. 2 shows the appearance of the tape-type disposable diaper in a state in which the skin contact surface side of the inside of the diaper is unfolded. 3 is shown in FIG. 3, and the cross-sectional structure taken along the line IV-IV in FIG. 2 is schematically shown in FIG.

  That is, the tape-type diaper 10 according to the present embodiment includes a liquid-impermeable cover sheet 11, a backsheet 12, an absorber 13, a liquid-permeable topsheet 14, and a pair of left and right sidesheets 15. .. The back sheet 12 on which the top sheet 14 is superposed has a size and shape substantially the same as the top sheet 14, and is joined to the cover sheet 11 formed of a thin non-woven fabric to obtain a good feel. The absorber 13 is disposed between the backsheet 12 and the topsheet 14 that is superposed on the backsheet 12, and the outer peripheral edge portions of the backsheet 12 and the topsheet 14 that directly contact each other are integrally formed with each other. To be joined. The outer side portions (left and right sides in FIG. 2) of the liquid-impermeable side sheet 15 are overlapped with the left and right sides of the cover sheet 11, and are formed on the left and right side edges of the back sheet 12 and the top sheet 14 and the cover sheet 11. They are integrally bonded to each other. The cover sheet 11 and the side sheet 15 have a pair of front and rear side flap portions 10f and 10r that extend outward from the left and right sides of the back sheet 12 and the top sheet 14, that is, from both side edges in the width direction. In the crotch region 10C between the side flap portions 10f and 10r, a pair of cutout portions 10N to be the leg opening 10L for the wearer are formed.

  In the present embodiment, the inside portions (center side in FIG. 2) of the pair of left and right side sheets 15 that overlap the left and right sides of the top sheet 14 are not joined to the top sheet 14. In order to form the three-dimensional gathers 15G on the inner side portion, the rubber thread 15a is joined to the inner edge portion of the side seat 15 in the stretched state.

  The base end portions of a pair of left and right fastening tapes 16 are joined to both side edges in the width direction of the side flap portion 10r on the rear body region 10R side by overlapping the side flap portions 10f on the front body region F side and connecting them when worn. Has been done. By overlapping the side flap portion 10r on the rear body region 10R side with the side flap portion 10f on the front body region 10F side via the fastening tape 16, the waist opening 10W and the leg opening 10L are formed. The fastening tape 16 is composed of a stretchable sheet having stretchability along the width direction thereof, and a hook-and-loop fastener 16a is attached to the tip end portion thereof. The surface fastener 16a can be repeatedly and releasably joined to the surface fastener sheet 17 joined to the cover sheet 11 on the front body region 10F side. Therefore, by stretching the fastening tape 16 with elastic force and joining the portion of the surface fastener 16a to the surface fastener sheet 17 of the front body region 10F, a proper tightening force is always applied to the waist of the wearer. be able to.

  Further, on the left and right side sheets 15 on the side of the rear body region 10R of the tape type diaper 10, an elastic sheet 18 around an elongated waist is laterally arranged in a stretched state so as to straddle the top sheet 14. The waist elastic sheet 18 in the present embodiment includes a base sheet 18a, a plurality of thread rubbers 18b joined to the base sheet 18a in parallel with each other in an extended state, and the base sheet 18a so as to cover the thread rubbers 18b. And an upper sheet 18c having a good feel to the touch. The waist elastic sheet 18 is disposed along the waist opening 10W and has a function of forming a waist gather (not shown) to improve the fit of the wearer around the waist. Similarly, leg elastic members 19 are arranged from the crotch region 10C along the outer longitudinal direction of both side edges of the absorber 13 to the front body region 10F side and the rear body region 10R side. In this embodiment, the leg elastic member 19 formed of rubber thread is fixed in an extended state between the cover sheet 11 and the side seats 15 to form leg gathers 19G to provide a fit around the leg of the wearer. It has the function of improving.

Therefore, the tape-type diaper 10 is formed with a waist-opening 10W surrounding the waist of the wearer with the front body region 10F and the back body region 10R when worn. Similarly, the front body region 10F and the rear body region 10R, and the crotch region 10C connecting the lower end portions of the front body region 10F and the rear body region 10R form a pair of left and right leg openings 10L surrounding the thighs of both legs of the wearer.

  Next, a detailed structure of the absorber 13 in the present embodiment will be described.

  FIG. 5 shows a planar shape of the top sheet 14 that wraps the absorbent body 13 between the back sheet 12 and the back sheet 12, and a part of the surface thereof is extracted and enlarged to be shown in FIG. 6, which is taken along arrows VII-VII and VIII in FIG. The cross-sectional shape along the arrow -VIII is shown in FIGS. 7 and 8, respectively.

  The absorbent body 13 in the present embodiment is mainly composed of an absorbent main body 13a composed of pulp and SAP, and a core wrap 13b such as tissue paper that wraps the absorbent main body 13a. However, it is also possible that the core wrap 13b is not required, that is, the absorbent body 13 is composed of only the absorbent body 13a. The absorbent body 13 has a front body portion, a crotch portion, and a rear body portion corresponding to these so as to reach the rear body region 10R from the front body region 10F of the diaper 10 through the crotch region 10C. In the crotch portion of the absorbent body 13, a pair of arcuate notches 13A are formed to match the pair of left and right leg openings 10L surrounding the thighs of both legs, and the width of the crotch portion is equal to that of the front body portion and It is narrower than the width of the back part.

  In addition, it is not essential to form the cutout portion 13A in the absorber 13. Further, as the contour shape of the absorber 13, various shapes such as an elliptical shape, a circular shape, or a square shape can be adopted in addition to the elongated shape as in the present embodiment. Furthermore, the ratio between the longitudinal direction that is the vertical direction in FIG. 5 and the lateral direction that is the lateral direction in FIG. is there.

As shown in FIG. 5 and FIG. 6, the absorber 13 has an embossed pattern forming region in which embossing is regularly performed from the surface thereof to the backsheet 12 together with the top sheet 14, that is, a recess forming region Z _R. .. In the recess forming region Z _R , an embossing pattern, which is an oblique lattice-like pattern as a whole from a perspective of perspective, is formed by the arrangement of the plurality of recesses 20a to 20c by embossing. Specifically, the third recesses 20c located at the intersections of the lattices, and the first recesses 20a and the first recesses 20a that are located between the third recesses 20c and extend along the first direction D1. And a second recess 20b extending along a second direction D2 different from the direction D1. In the present embodiment, the first direction D1 is inclined by 45 degrees with respect to the width direction of the absorbent body 13, and the second direction D2 is opposite to the first direction D1 with respect to the width direction of the absorbent body 13. Although the embossed pattern is inclined by 45 degrees and is symmetrical in FIG. 5, the embossed pattern is not limited thereto. It is effective that the first and second directions D1 and D2 are 10 degrees or more and less than 80 degrees with respect to the width direction of the absorber 13, and preferably 30 degrees or more and 45 degrees or less. Third recess 20c is discontinuous with respect to the first recess 20a and the second recess 20b, around the recess-free region where embossing is not performed, i.e. surrounded by undeformed regions Z _U It is in a state.

The oblique lattice-shaped embossing pattern in the present embodiment has a first recess row L1 including a first recess 20a and a third recess 20c, and a second recess including a second recess 20b and a third recess 20c. And the concave row L2. A first recess row L1 in which the first recesses 20a and the third recesses 20c are alternately arranged along the first direction D1 is arranged at a constant interval S2 along the second direction D2. .. Further, the second recess row L2 in which the second recesses 20b and the third recesses 20c are alternately arranged along the second direction D2 is arranged at a constant interval S1 along the first direction D1. ing. In the present embodiment, the spacing S1 between the second recess rows L2 along the first direction D1 and the spacing S2 between the first recess rows L1 along the second direction D2 are each set to 27.0 mm. However, it is preferable that the intervals S1 and S2 be 5 5.0 mm or less. However, the intervals S1 and S2 do not necessarily have to be set to the same value over the entire area of the absorber 13, and these may be set to different values for each part of the absorber 13. Further, it is also possible to leave the third recess 20c in the undeformed region ZU without forming the third recess 20c in the intersection region of the lattice.

The first recess 20a, the second recess 20b, and the third recess 20c are formed by integrally compressing the top sheet 14, the core wrap 19, and the absorber 13. Further, as shown in FIG. 5, the embossed pattern is not formed on the peripheral portion of the absorbent body 13, and therefore the recessed portion forming region Z _R is surrounded by the recessed portion non-forming region Z _N in which the embossed pattern is not formed. It is in a broken state. Due to the presence of the non-recessed region Z _N , liquid such as urine leaks from the peripheral edge of the absorbent body 13 through the first recess 20a, the second recess 20b, and the third recess 20c forming the emboss pattern. Can be suppressed. Note that, in FIG. 5, the boundary between the recess forming region Z _R and the recess non-forming region Z _N is indicated by a chain double-dashed line for convenience.

  As can be understood from FIGS. 5 and 6, one grid (grid) of the grid forming the grid pattern has the following configuration. The main parts of the four sides are formed by the first recesses 20a and the second recesses 20b, and the four corners are formed by the third recesses 20c. Here, the length U of the first recess 20a and the second recess 20b is shorter than the intervals S1 and S2. As shown in FIG. 5, the first recess 20a and the second recess 20b do not overlap.

In FIG. 6, the regions indicated by the alternate long and two short dashes lines surrounding the recesses 20a to 20c are recess semi-forming regions Z _S. That is, when the recesses 20a to 20c are formed by embossing, the top sheet 14 and the absorbent body 13 are strongly compressed, and the top sheet 14 and the absorbent body 13 around the recesses 20a to 20c are drawn to this and compressed. become. In this specification, the weakly compressed regions around the first recess 20a, the second recess 21b, and the third recess 20c that are strongly compressed by the embossing type are referred to as recess semi-formation regions Z in this specification. _Call it _S. Therefore, the absorbent body 13 is substantially deformed by the embossing process from the state before the embossing process in addition to the first recesses 20a, the second recesses 20b, and the third recesses 20c, and the semi-formation of the recesses around them. It becomes the area Z _S. Since other recesses 20a~20c and concave semi-formation region Z _S is not compressed by embossing, the undeformed regions Z _U. That is, the region between the third recess 20c and the first recess 20a and the second recess 20b located in the intersection region of the lattice and the region surrounded by the lattice are the undeformed regions Z _U , such as urine. This is a part that achieves the original function of the absorber 13 that holds the liquid.

As shown in FIG. 5 and FIG. 6, the thickness (height) of the absorber 13 in the recess non-formation region Z _N and the undeformed region Z _U in the present embodiment is substantially the same before and after embossing. On the other hand, the first concave portion 20a, the second concave portion 20b, and the third concave portion 20c in the concave portion forming region Z _R are in a state in which the absorber 13 is compressed by the embossing process, and are larger than the undeformed region Z _U. The thickness of the absorber 13 is thin. The recess semi-formation region Z _S is a part that connects the recess formation region Z _R and the undeformed region Z _U and in which the thickness of the absorber 13 gradually changes.

  Next, more detailed shapes of the recesses 20a to 20c will be specifically described.

As shown in FIGS. 6 to 8, the first recesses 20 a and the second recesses 20 b are shallow recesses 201 that form these contours, and are intermittently arranged in each shallow recess 201, and the shallow recesses 201 are formed. And a circular deep recess 202 that is deeper than the above. As shown in FIG. 7, the elongated shallow recess 201 has a length U which is substantially constant and is shorter than the distance S _Z between two recess semi-forming regions Z _S facing each other in the first direction D1 or the second direction D2. It has an elongated oval shape with a width V. The deep recesses 202 having a diameter smaller than the width V of the shallow recesses 201 are alternately arranged inscribed in the opposite side wall portions of the shallow recesses 201 at predetermined intervals along the longitudinal direction of the shallow recesses 201. The deep recess 202 is deeply recessed so as to come closer to the back sheet 12 side than the shallow recess 201.

As shown in FIG. 8, the deep recess 202 is located at the farthest (deepest) position from the surface of the topsheet 14 in the undeformed region ZU toward the backsheet 12 side, and the topsheet 14 in the undeformed region ZU is located. The shallow recess 201 is located between the surface of the and the deep recess 202. The bottom surface to the depth of the deep recesses 202 from the bottom of the shallow recess 201, i.e. the depth from the surface of the topsheet 14 in the undeformed region ZU to the bottom surface of the deep recesses 202 (hereinafter, simply deep recess 20 and second depth and description to) Q1, the difference Q3 between the top depth from the surface of the sheet 14 to the bottom surface of the shallow recess 20 1 (hereinafter, simply shallow recesses 20 1 in depth and describes) Q2 in the undeformed region ZU is deep recess 20 is about 3.5 to 15% of the second depth Q1. The distance from the top sheet 14 in the undeformed region ZU to the back sheet 12, that is, the thickness of the absorbent body 13 and Q4, depth Q1 deep recesses 20 2, 42.5% of the thickness of Q4 to 97. It is about 5%. Similarly, the depth Q2 of the shallow recess 201 is about 37.5% to 95.0% of the thickness Q4. As described above, the first recess 20a and the second recess 20b in the present embodiment are formed by compressing the absorber 13 to a considerable depth. And it has a shape having two levels of depth.

On the other hand, as shown in FIG. 8, the depth from the surface of the top sheet 14 in the undeformed region Z _U to the bottom surface of the third recess 20 c located in the intersection region of the lattice (hereinafter, referred to as the third recess 20 c (Described as depth) is set to be the same as the depth Q2 of the shallow recess 201.

More specifically, the thickness Q4 of the undeformed region ZU of the absorbent body 13 is 8.0 mm, which is preferably in the range of 5.0 mm to 20.0 mm. As shown in FIG. 8, the depth Q1 deep recesses 20 2 is a 7.8 mm, preferably in the range of 3.0Mm～8.0Mm. Then, the difference Q3 between the depth to Q 1 shallow recess 20 first depth Q2 is 7.5 mm, depth Q 2 and the depth recess 202 of the shallow recess 201, in the range of 0.1mm~0.5mm Is preferred.

  In the embossing process for forming the first recess 20a, the second recess 20b, and the third recess 20c, an adhesive agent is interposed between the top sheet 14 and the absorber 13, and the top sheet 14 is removed from the top sheet 14 surface. The absorber 13 and the absorber 13 are compressed together. The first recessed portion 20a, the second recessed portion 20b, and the third recessed portion 20c are formed by compressing the topsheet 14 and the absorber 13 together from the surface of the topsheet 14 by a predetermined die formed on the embossing roll. It was done.

  Then, in the first recess 20a and the second recess 20b, the deep recess 202 is a small circle, and its area is small. Therefore, when pressed by the embossing roll, the pressure is concentrated on the deep recess 202, and the absorber 13 and the top sheet 14 are strongly compressed. At the time of this compression, the pulp fibers of the absorber 13 and the fibers of the top sheet 14 are firmly entangled with each other and are joined together in an integrated state. Next, even in the shallow recess 201, the same pressing force is applied during compression, but since the area is large, the pressure is not concentrated as much as in the deep recess 202. Therefore, the bonding between the absorber 13 and the top sheet 14 is slightly weaker than that of the deep recess 202, but it is sufficient to form the recess shape. In this way, the absorber 13 is strongly compressed in the deep recess 202, and the absorber 13 and the top sheet 14 are firmly joined to each other, whereby the shapes of the first recess 20a and the second recess 20b are maintained. To be done. For example, even when the wearer of the diaper 10 sits down and the pressure due to the weight of the wearer is applied to the surface of the absorber 13, the first recess 20a and the second recess 20b do not sag. , Its shape is maintained. Even if the diaper 10 is strongly pulled due to various movements of the legs, the top sheet 14 and the absorbent body 13 are firmly joined to each other, so that the first recess 20a and the second recess 20b are The shape can be maintained.

  Here, instead of using the two-step structure of the shallow recess 201 and the deep recess 202, it is also possible to form the entire first recess 20a and the second recess 20b by applying a strong compressive force. That is, in the embossing process, instead of using a mold in which a round protrusion corresponding to the deep recess 202 is further projected inside the substantially elliptical protrusion corresponding to the shallow recess 201, a substantially elliptical protrusion having a flat surface is used. It is also conceivable to compress using a chisel type. However, since such a mold does not have a location where the pressure is concentrated, unless a strong pressure is applied as a whole, a location where the fibers of the top sheet 14 and the absorbent body 13 are strongly entangled with each other can be created. Absent. As a result, the required pressing force becomes very strong and the topsheet 14 may be torn. Further, it is difficult to form the first concave portion 20a and the second concave portion 20b that can withstand the weight of the wearer and various movements by compression with a weak pressing force on the whole. In the present embodiment, a protrusion corresponding to the deep recess 202 is provided in the embossing die and the portion is strongly compressed to form a place where the top sheet 14 and the absorbent body 13 are firmly joined, and at the time of manufacturing. It is possible to prevent the occurrence of defects such as breakage of the top sheet 14.

  Further, as described above, the third recesses 20c arranged in the intersection points of the lattice are formed by the absorber 13 being pressed and compressed by the embossing rolls to the same extent as the shallow recesses 201. The strength of this pressing is such that the topsheet 14 and the absorber 13 can be integrally joined without breaking the topsheet 14.

As shown in FIGS. 7 and 8, in the absorber 13, the bottom surface portion of the deep recess 202 is the high-density portion 13H in which the density of the absorber 13 is the highest, and the previous undeformed region Z _U is the absorber. The low density portion 13L has the lowest density of 13. Further, the bottom surface portion of the shallow recess 201 and the bottom surface portion of the third recess 20c are the middle density portion 13M having a density intermediate between the high density portion 13H and the low density portion 13L. Further, the recess semi-forming region Z _S becomes the density changing portion 13V whose density gradually decreases toward the undeformed region Z _U.

  As described above, the absorbent body 13 is mainly composed of SAP and pulp, and the pulp fiber density mainly contributes to the density. Therefore, the high-density portion 13H is in a state where the pulp is compressed and the gaps between the pulps are small, while the low-density portion 13L is in a state where the gaps between the pulps are larger than the high-density portion 13H.

In addition, since the recesses 20a to 20c are formed by compression-bonding the top sheet 14 which is a synthetic resin and the absorber 13 whose main component is pulp, from the bottom surface of the recesses 20a to 20c to the high density portion 13H. And liquids such as urine tend to be poorly absorbed. Therefore, the liquid flowing into the recess 20a~29c passes through the side wall of the recess 20a~20c is absorbed into density changing portion 13V, further flows to the low density portion 13L of the undeformed regions Z _U.

In the present embodiment, when forming the first and second recess row L1 and L2, the recesses 20a to 20c are formed intermittently without making the recesses 20a to 20c continuous. In particular, the third concave portion 20c is provided in the intersection region of the oblique lattice, and the first concave portion 20a and the second concave portion 20b surrounding the third concave portion 20c are located apart from the third concave portion 20c. Such gaps surrounding the third recess 20c, i.e. be described below reason for forming the undeformed regions Z _U.

  As described above, the first and second rows L1 and L2 of the oblique lattice are formed by pressing the respective embossing patterns having complementary embossing patterns on the surface thereof while rotating the embossing rolls. It is formed. As shown in FIG. 5, when the absorbent body 13 is fed in the longitudinal direction while rotating the embossing roll, the width direction of the absorbent body 13 orthogonal to the conveying direction of the absorbent body 13 (upward direction in FIG. 5). The portions of the first concave portion 20a and the second concave portion 20b arranged side by side are simultaneously pressed by the embossing roll. In the present embodiment, the diameter of the embossing roll is set so that the circumferential length of the embossing roll corresponds to the lengths of the back sheet 12 and the top sheet 14 to be cut, but the present invention is not limited to this.

  In this embodiment, the rotation axis of the embossing roll is orthogonal to the conveying direction of the continuous body of the backsheet 12 and the topsheet 14 in which the absorbers 13 are arranged at regular intervals. As described above, after the top sheet 14 and the absorber 13 are both compressed by the embossing roll, the cover sheet 11, the side sheet 15 and the like are overlapped and bonded to each other and cut into the diaper 10 having a predetermined size.

  The first recess 20a is inclined 45 degrees to the right with respect to the conveying direction of the absorber 13, and the second recess 20b is inclined 45 degrees to the left. Therefore, as the feeding to the absorber 13 with respect to the embossing roll progresses, the distance between the first concave portion 20a and the second concave portion 20b adjacent to each other in the width direction of the absorber 13 toward the intersection of the lattice becomes shorter. I'm going.

  Here, when the embossing roll forming the recesses 20a to 20c is pressed, the top sheet 14 is drawn into the recesses 20a to 20c. In particular, since the first recess 20a and the second recess 20b are arranged adjacent to each other in the width direction of the absorbent body 13, the topsheet 14 is pulled in from the left and right at the same time in forming these. Become. That is, the pulling force of the absorbent body 13 in the width direction (left and right direction in FIG. 6) is applied to the top sheet 14 simultaneously between the first recess 20a and the second recess 20b which are adjacent to each other. As the distance between the first recess 21a and the second recess 21b adjacent to each other becomes shorter, that is, closer to the intersection of the lattice, a stronger tensile force acts on the top sheet 14 between them.

  For example, when the third recesses 20c are omitted and the first recesses 20a and the second recesses 20b are extended to the vicinity of the intersections of the grids when forming the grid patterns of the same size, the following is performed. Problems arise. That is, in the vicinity of the intersections of the lattice, the top sheet 14 is not only provided in a state where the absorber 13 itself has a high density and is in a hard state, but also due to the pulling force generated during the embossing of the adjacent left and right recesses 20a and 20b. The state is strongly pressed against the absorber 13. Therefore, in the vicinity of the intersection of the lattice, the SAP contained in the absorber 13 strongly hits the top sheet 14 and has a rough texture. This is not preferable because it irritates the wearer's skin.

  Therefore, in the present embodiment, the distance between the first concave portion 20a and the second concave portion 20b adjacent to each other in the width direction of the absorbent body 13 is maintained at a certain level or more so that the top sheet 14 is not strongly pulled further. To That is, the absorbent body 13 is compressed and the absorbent body 13 and the topsheet 14 are bonded together with a margin so that the topsheet 14 is not stretched by plastic deformation but stretched by elastic deformation. As a result, it is possible to suppress the rough texture of the SAP and the hardening of the intersection region of the lattice.

  Hereinafter, the shortest distance between the first concave portion 20a and the second concave portion 20b along the width direction of the absorbent body 13 that satisfies such a condition is referred to as T for convenience sake. By setting the shortest distance between the first concave portion 20a and the second concave portion 20b along the width direction of the absorber 13 to be T or more, the top sheet 14 is fixed to the absorber 13 without applying a strong tensile force. Therefore, it is possible to avoid a hard touch. Although the above-mentioned problem about the excessive pulling force of the top sheet 14 does not occur in the longitudinal direction of the absorber 13, the problem that the absorber 13 becomes hard cannot be solved. Therefore, it is effective that the shortest distance between the first concave portion 20a and the second concave portion 20b along the longitudinal direction of the absorber 13 is also T or more.

  In other words, when the emboss pattern is set, the distance between the adjacent first and second recesses 20a and 20b is T or more in the direction parallel to the diagonal line of the lattice partitioned by the first and second recess rows L1 and L2. The length U of the recesses 20a and 20b is set so that

  As an example, when the thickness of the absorber 13 is 8 mm and the depth Q2 of the third recess is 6 mm, the above-mentioned T is about 7 mm. This value also changes depending on the relationship between the amount of SAP and the amount of pulp fiber in the absorber 13 and the thickness of the top sheet 14. An important point in the present invention is that when an embossed pattern having an oblique component such as an oblique lattice pattern is used, the embossed pattern is not formed in a portion where the interval between adjacent concave portions becomes narrow.

On the other hand, since the intersection of the lattice itself is not a place that is closely approached and pressed from both the left and right simultaneously, the top sheet 14 is not strongly pulled. If the undeformed region Z _U where the recesses 20a to 20c are not formed is taken too wide in consideration of the tension acting on the top sheet 14, the first and second recess rows L1 and L2 will not be identified as rows, and as a grid pattern. May not be recognized. Moreover, that too first recess 20a and the interval between the second recess 20b and the third recess 20c, i.e. when undeformed region Z _U is wide, the absorbent body 13 is easily bent obliquely to follow the movement of the body It becomes difficult to exert the effect. Therefore, it is possible to form the third recesses 20c at the intersections of the lattices that have no influence on the tension acting on the top sheet 14 and improve the visibility as a lattice to further improve the visual effect. Further, the absorber 13 can follow the movement of the wearer's body without making the intersection region of the lattice hard, and the absorber 13 can be easily bent.

As described above, in the present embodiment, the shortest distance between the adjacent concave portions 21 is set not to be less than T. That is, the embossed pattern in which the concave portions 21 are arranged at a distance T or more, that is, the vicinity 26 of the intersection of the lattice is an embossed pattern that is not embossed, so that the skin contact surface is prevented from becoming hard to the touch. Since the intersection area of the lattice is fluffy like the undeformed area Z _U of the absorber 13, even if the embossed pattern of the oblique lattice is used, the intersection area of the lattice does not have a hard and sharp touch. It can give the wearer a soft touch.

  Further, by providing a third recess 20c at the intersection of the first recess row L1 and the second recess row L2, the intersection of the lattice (the apex of the mass) can be visually clarified to improve aesthetics and design. Improve sex. Further, the obliquely extending concave portions rows L1 and L2 can prevent confusion with wrinkles due to manufacturing defects, irregularly arranged twists, and the like. Further, the absorbent body 13 that follows the movement of the body is easily deformed in an oblique direction. However, it is also possible to omit the third recess 20c, in which case the length of the first recess 20a and the second recess 20b is increased so that they are closer to the intersection region of the grid. Preferably.

In the present embodiment, the length U of the first concave portion 20a and the second concave portion 20b in the longitudinal direction is 19.0 mm, but the distance S1 between the second concave row L2 and the distance S2 between the first concave row L1. It is preferably 55% to 85%. The width V of the first recess 20a and the second recess 20b is 3.0 mm, but it is preferably 2.0 mm or more and 4.0 mm or less. The width V1 of the third recess 20c along the first direction D1 or the second direction D2 is the same as or smaller than the width V of the first recess 20a and the second recess 20b. Although the width V1 is set to 2.0 mm in this embodiment, it is preferably 1.0 mm or more and 4.0 mm or less. On the other hand, the gap between the first and second recesses 20a and 20b and the third recess 20c, that is, the length of the undeformed region Z _U is 4.4 mm, but 2.0 mm or more and 6.0 mm. The following is preferable.

  By forming each of the recesses 20a to 20c with such a depth and interval, it is possible to maintain the groove even when weight is applied and to maintain a soft touch on the skin contact surface of the crotch of the diaper. can do. Therefore, the oblique lattice-shaped embossed pattern can suppress deformation such as a diaper being deformed by various movements of the leg, and can soften the touch to suppress irritation to the skin as much as possible.

  In the present embodiment, the outer shapes of the first recesses 20a and the second recesses 20b are determined by the elongated, substantially elliptical shallow recesses 201. However, the present invention is not limited to this, and the diagonal grid is not limited thereto. The compressed rows may be formed by intermittently arranging a plurality of dots or concave portions such as parallelograms. That is, in this embodiment, it is important to provide a predetermined size in the vicinity of the intersection 26 that does not form a recess, and it is defined by the first recess 20a and the second recess 20b that configure each side of the lattice. The shape of the concave portion is not limited to this embodiment. The same effect can be obtained by arranging the plurality of dots and the like described above. Also in this case, the recesses are arranged such that the distance between the adjacent recesses in the direction parallel to the diagonal line of the grid of the lattice is T or more.

  In addition, in the present embodiment, the mass of the mass is not increased by the first recesses 20a and the second recesses 20b, but by the two or more first recesses 20a and the second recesses 20b whose longitudinal lengths are shortened. You may make it form one side. Further, the arrangement of the deep recesses 202 in the shallow recesses 201 is distributed outward in the width direction so as to be staggered, but the present invention is not limited to this, and any arrangement such as arranging them in a line in the center is possible. Good. Further, the shape of the deep recess 202 is not limited to the shape shown in the present embodiment, but may take various shapes such as a quadrangle, an ellipse, and a triangle.

  Further, in the present embodiment, the third recess has a quadrangular bobbin shape, but the present invention is not limited to this and may have a barrel-shaped quadrangle or a circle. That is, any shape may be used as long as it is suitable for recognizing the intersection of the grid in the grid pattern.

  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 embodiment, all the changes and modifications included in the concept of the present invention are described. Other than that, it is possible. That is, all the matters in the above-described embodiment are not intended to limit the present invention, and may be arbitrarily changed according to the use and purpose thereof, including the configuration not directly related to the present invention. It is a thing.

10 tape type disposable diapers (diapers)
10C Inseam area 10F Front body area 10L Leg opening 10N Notch 10R Rear body area 10W Waist opening 10f, 10r Side flap 11 Cover sheet 12 Backsheet 13 Absorber 13a Absorbent body 13b Core wrap 13A Notch 13H High density part 13M Medium density part 13L Low density part 13V Density change part 14 Topsheet 15 Sidesheet 15G Three-dimensional gather 15a Thread rubber 16 Fastening tape 16a Surface fastener 17 Surface fastener sheet 18 Waist elastic sheet 18a Base sheet 18b Thread rubber 18c Upper sheet 19 Leg elastic member 19G Leg gather 20a First concave portion 20b Second concave portion 20c Third concave portion 201 Shallow concave portion 202 Deep concave portion L1 First concave row L2 Second concave row D1 First direction D2 Second Direction of 2 S1 Distance between second concave rows S2 Distance between first concave rows Z _R concave forming area Z _N concave non-forming area Z _S concave semi-forming area Z _U undeformed area U shallow concave length V shallow concave Width V1 Width of the third recess Q1 Depth from the surface of the top sheet in the undeformed region to the bottom of the deep recess Q2 Depth from the surface of the top sheet in the undeformed region to the bottom of the shallow recess Q3 Shallow recess From the bottom surface of the bottom to the bottom of the deep recess Q4 Distance from the top sheet to the back sheet in the undeformed region (thickness of the absorber)

Claims (4)

A diaper having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber containing a highly liquid-absorbent resin, which is arranged between the topsheet and the backsheet,
A first concave portion formed on the surface of the absorber facing the top sheet and extending along a first direction;
Comprising a second recess extending along the second direction are formed on a surface different from the first direction of the absorbent body facing the top sheet, said first recess and said second The recess is compressed from the surface of the absorber toward the bottoms of the first recess and the second recess, and the depth Q2 from the surface of the absorber to the bottoms of the first recess and the second recess. Is compressed toward the bottom surface of the first recess and the second recess from the surface of the absorber and the shallow first region, and the first recess from the surface of the absorber from the first region. And a second region in which the depth Q1 to the bottom surface of the second recess is deep, the Q2 is 3.0 mm to 8.0 mm, and the difference between the Q1 and the Q2 is 0.1 mm. ~ 0.5 mm range,
The absorber is present between the lower surface of the first region and the second region and the backsheet,
Wherein not overlap the first direction and the second direction Oite the first recess and the second recess in the intersections of, further comprising a third recess formed in the intersection region ,
The first recess, the second recess, and the third recess are formed in the top sheet integrally with the absorber,
The said absorber has an undeformed area | region between the said 3rd recessed part and the said 1st recessed part and the said 2nd recessed part which adjoin this, The diaper characterized by the above-mentioned. The diaper according to claim 1, wherein the absorbent body has a recessed portion non-forming region in which the first recessed portion, the second recessed portion, and the third recessed portion are not formed in a peripheral edge portion of the absorbent body. .. A plurality of the first recesses are arranged at a predetermined interval along the second direction, and a plurality of the second recesses are arranged at a predetermined interval along the first direction. The diaper according to claim 1 or claim 2 . The diaper according to any one of claims 1 to 3, wherein said absorber is for urine absorption.

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