JP6433461B2 - Disposable wearing items - Google Patents

Description

  The present invention relates to a disposable wearing article.

  DESCRIPTION OF RELATED ART Conventionally, the disposable diaper (disposable wearing article) provided with the surface sheet which has a recessed part and a convex part in the skin opposing surface is well-known. For example, Patent Document 1 discloses a diaper in which an absorber includes the above-described top sheet (body side liner).

  In this diaper, the absorbent body has a liquid absorbent core that absorbs excrement such as urine on the non-skin facing surface side of the top sheet, and end flaps that extend outward from both end edges of the liquid absorbent core. Yes.

  Moreover, this diaper is repairing the cover sheet which covers the both end edges of the end flap of the absorber. According to this diaper, the end edges of the end flap of the absorber hit the wearer's skin by the cover sheet. Can be prevented.

JP, 2006-34341, A (JP2016-34341A)

  In the disposable diaper according to the invention disclosed in Patent Document 1, since the cover sheet and the liquid-absorbent core overlap in plan view, both end edges of the liquid-absorbent core are covered with the cover sheet. As a result, the air flow path formed by the concave portion of the top sheet is blocked by the cover sheet, so that the air permeability inside the diaper may be reduced.

  The subject of this invention is improvement of the conventional diaper, Comprising: It is providing the disposable wearing article which the air permeability inside a diaper does not fall.

  In order to solve the above problems, the present invention has a lateral direction, a longitudinal direction, a thickness direction, a skin facing surface and a non-skin facing surface, a front waist region, a rear waist region, and the front and back waist regions. The present invention relates to a disposable wearing article having a waist opening including a crotch region positioned between and a liquid absorbing structure disposed at least in the crotch region, and having both side edges of the front and rear waist regions fixed to each other.

In the disposable wearing article according to the present invention, the liquid-absorbing structure includes a liquid-permeable body-side liner located on the skin-facing surface side, and a liquid-absorbing property located on the non-skin-facing surface side of the body-side liner. A core and end flaps extending outward in the longitudinal direction from both end edges of the liquid-absorbent core, and extending in the longitudinal direction on the skin facing surface of the body side liner, alternately in the lateral direction. The concave and convex portions formed from the ridges and the groove portions that are aligned with each other are located, and the front and rear waist regions are an inner layer sheet positioned on the skin facing surface side, an outer layer sheet positioned on the non-skin facing surface side, and the end A cover sheet that covers both end edges of the flap, the cover sheet and the liquid-absorbent core do not overlap in plan view, and the outer layer sheet is formed of a main body located on the non-skin facing surface; Extending from the portion to the outside in the longitudinal direction An extension part that defines a part of the facing surface; and a bent part positioned between the main part and the extension part; and the extension part of the outer layer sheet in the front waist region. An inner end portion located on the inner side in the longitudinal direction is located between the cover sheet and the main body portion in the thickness direction, and the longitudinal direction of the extending portion in the outer layer sheet in the rear waist region The cover sheet is disposed so that an inner end portion located on the inner side and an outer end portion located on the outer side in the longitudinal direction of the cover sheet are spaced apart in the plan view, and the extension of the outer layer sheet is extended. The inner end portion of the protruding portion is located on the outer side in the longitudinal direction of the outer end portion of the cover sheet .

  The body side liner is formed of a fiber nonwoven fabric containing a thermoplastic synthetic fiber, the synthetic fiber is welded in the groove portion, and the synthetic fiber is compared with the heel portion in the heel portion. Are dispersed from each other. Since the synthetic fiber is welded in the groove, the rigidity of the groove is greater than the rigidity of the buttocks, and the lateral dimension of the groove is small even when a compressive force is applied to the body side liner in the lateral direction. Can be suppressed. For this reason, the air permeability on the skin facing surface side of the wearing article can be ensured.

  The body side liner has greater rigidity in the longitudinal direction than in the lateral direction. For this reason, it can prevent that the body side liner bends along the bending line along the horizontal direction.

  The body side liner has a dimension in the thickness direction of the buttock and groove in the front and rear waist region larger than a dimension in the thickness direction of the buttock and groove in the crotch region. For this reason, the air permeability in the front and rear waist regions can be maintained.

  The front-rear waist region includes an inner sheet positioned on the skin facing surface side, an outer sheet positioned on the non-skin facing surface side, and an elastic member positioned between the inner sheet and the outer sheet. When the elastic member contracts in the lateral direction, the body-side liner has the heel portion in the front and back waist region, rather than the dimension in the thickness direction of the heel portion and the groove portion in the crotch region. The dimension in the thickness direction with the groove is increased. For this reason, the breathability in the part which opposes a wearer's belly and a back can be maintained by utilizing the elastic member of a front-back waist area.

  While the central part of the cover sheet in the vertical direction is fixed to the end flap, at least the inner end part of the inner and outer end parts in the vertical direction is not fixed to the end flap. For this reason, it can suppress that a cover sheet obstructs the shrinkage | contraction to the horizontal direction of an elastic member by reducing the part to which the cover sheet is fixed.

  The front and rear waist regions include a main body located on the non-skin facing surface, an extending portion extending from the main body and defining a part of the skin facing surface, the main body and the extending portion. A waist sheet having a bent portion positioned between the waist openings, and the waist opening is defined only by the waist sheet. For this reason, a waist opening can be made flexible.

  The front and rear waist regions include a main body located on the non-skin facing surface, an extending portion extending from the main body and defining a part of the skin facing surface, the main body and the extending portion. A waist sheet having a bent portion positioned between the end portion of the extension portion of the waist sheet and the end portion of the cover sheet in the rear waist region. Separated in direction. For this reason, since the part where the edge part of the extension part of a waist sheet and the edge part of a cover sheet have separated is small, it can control that the outer edge part of a back waist region shifts down during wearing. it can.

  The front and rear waist regions include a main body located on the non-skin facing surface, an extending portion extending from the main body and defining a part of the skin facing surface, the main body and the extending portion. A waist sheet having a bent portion positioned between the end portions of the extension portion of the waist sheet and the end portion of the cover sheet in the front waist region. Yes. For this reason, since the portion where the end of the extended portion of the waist sheet overlaps the end of the cover sheet has high rigidity, even if force is applied to the wearing article from the outside, the portion having high rigidity is stretched. It is possible to prevent the outer end portion of the front waist region from shifting downward.

  According to the disposable wearing article according to one or more embodiments of the present invention, since both end edges of the end flap are covered with the cover sheet, the wearer's uncomfortable feeling can be reduced. In addition, since the cover sheet and the liquid-absorbent core do not overlap in plan view, the body side liners located at both end edges of the liquid-absorbent core are not covered with the cover sheet. Thereby, since the air flow path formed by the groove portion of the body side liner continues to the outer end portion of the liquid-absorbent core, the air permeability on the skin facing surface side of the wearing article can be improved.

The drawings illustrate certain embodiments of the invention according to the present disclosure and include selective and preferred embodiments as well as essential configurations of the invention.
The perspective view of the disposable wearing article (diaper) which concerns on this invention. The partially broken expanded view of a diaper in the state which extended each elastic body to the vertical direction and the horizontal direction of a diaper. The partial enlarged view of a front waist region. Sectional drawing which follows the IV-IV line | wire shown in FIG. The partial enlarged view of a back waist region. Sectional drawing which follows the VI-VI line shown in FIG. The perspective view of a body side liner. The side view of a welding apparatus. Sectional drawing of a welding apparatus. The expanded sectional view of a body side liner.

  The following embodiment relates to the disposable wearing article shown in FIGS. 1 to 10 and includes not only an indispensable structure of the invention but also a selective and preferable structure.

  With reference to FIGS. 1-6, the disposable diaper 10 which is an example of the disposable wearing article in this invention has the vertical direction Y and the horizontal direction X orthogonal to it, a skin opposing surface and the non-skin opposing surface facing it, An annular elastic waist panel 11 extending in the direction around the waist, an absorption chassis (liquid absorbing structure) 12 attached to the skin facing surface side of the elastic waist panel 11, a front waist region 13, a rear waist region 14, and front and rear And a crotch region 15 located between the waist regions 13 and 14.

  The elastic waist panel 11 has an elastic belt function that expands and contracts in the direction around the waist, and includes a front waist panel 16 that forms the front waist region 13 and a rear waist panel 17 that forms the rear waist region 14.

  The front waist panel 16 has a substantially rectangular shape defined by an inner edge 16a, an outer edge 16b, and both side edges 16c and 16d extending from the inner edge 16a to the outer edge 16b. The rear waist panel 17 includes an inner edge 17a, an outer edge 17b, first both side edges (both edges of the rear waist region) 17c and 17d extending inward in the longitudinal direction Y from the outer edge 17b, It has a substantially trapezoidal shape defined by second side edges 17e and 17f extending obliquely inward in the longitudinal direction Y from both side edges 17c and 17d.

  Both side edges 16c, 16d of the front waist panel 16 and the first side edges 17c, 17d of the rear waist panel 17 facing each other are overlapped with each other and connected by side seams 18 arranged intermittently in the longitudinal direction Y (for example, heat The waist opening 19 and the pair of leg openings 20 are defined by connecting them by various heat welding means such as embossing and sonic.

The front and rear waist panels 16 and 17 include inner layer sheets (inner surface sheets) 21 and 22 positioned on the skin facing surface side and outer layer sheets (outer surface sheets) 23 and 24 positioned on the non-skin facing surface side, respectively. The inner and outer layer sheets 21 to 24 are SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric, spunbond fiber nonwoven fabric or air-through fiber nonwoven fabric having a mass of 10 to 30 g / m ² , or a plastic sheet, a perforated plastic sheet, and their A laminate sheet or the like can be used.

  The outer layer sheets 23 and 24 include main body portions 23a and 24a located on the non-skin facing surface, and an extending portion 23b that extends from the main body portions 23a and 24a to the outside in the longitudinal direction Y to define a part of the skin facing surface. , 24b and bent portions 23c, 24c located between the main portions 23a, 24a and the extending portions 23b, 24b. Since the waist opening 19 is defined only by the outer layer sheets 23 and 24, the number of sheets can be reduced as much as possible, and the waist opening 19 can be made flexible. Since the waist opening 19 becomes flexible, it is possible to buffer the force that the front and rear waist regions 13 and 14 try to slide down due to the movement of the infant's stomach, etc., and the groove portion continuous in the longitudinal direction Y of the body side liner 44 The space formed by 62 can be maintained. Thereby, the air inside the diaper 10 can be easily flown along the groove 62.

  The extending portion 23b in the front waist region 13 has a joining region 80 that fixes the entire region of the extending portion 23b to the inner layer sheet 21 (see FIG. 4). On the other hand, the extending portion 24b in the rear waist region 14 has a joining region 81 fixed to the inner layer sheet 22 on the outer side in the vertical direction Y, and has a non-joining region 82a not fixed to the inner layer sheet 22 on the inner side in the vertical direction Y. However, a non-connection region 82b that does not fix the main portion 24a and the extending portion 24b of the outer layer sheet 24 is provided outside in the vertical direction Y (see FIG. 6).

  Between the inner layer sheets 21 and 22 and the outer layer sheets 23 and 24 of the front and rear waist panels 16 and 17, a plurality of front and rear waist elastic bodies (elastic members) 27 and 28 in a string shape or a strand shape extend and contract in the lateral direction X. The front and rear waist panels 16 and 17 are elasticized at least in the lateral direction X. The front waist elastic body 27 includes a front upper waist elastic body 27A extending in the horizontal direction X along the waist opening 19, and a front lower waist elastic extending in the horizontal direction X between the front upper waist elastic body 27A and the inner end edge 16a. And a body 27B. The rear waist elastic body 28 includes a rear upper waist elastic body 28A extending in the lateral direction X along the waist opening 19, and a rear lower waist elasticity extending in the lateral direction X between the rear upper waist elastic body 28A and the inner end edge 17a. And a body 28B.

  The front and rear lower waist elastic bodies 27B and 28B are partially cut or removed at the central portions of the front and rear waist regions 13 and 14, respectively, and front and rear non-stretchable regions 36 and 37 are defined. As described above, since the front and rear non-stretchable regions 36 and 37 are located at the center of the front and rear waist regions 13 and 14, the central portion of the absorbent chassis 12 (of the absorbent core is located on the inner surface of the front and rear waist panels 16 and 17). Since the contraction force of the front and back lower waist elastic bodies 27B and 28B is directly applied to the center portion and no gathers are formed, it is possible to suppress a decrease in absorption performance due to the contraction force acting.

  As the front and rear waist elastic bodies 27 and 28, for example, a string-like or strand-like elastic material having a fineness of 470 to 1240 dtex and arranged 1.5 to 3.5 times is used. Can do. Conditions such as the fineness of the front and rear waist elastic bodies 27 and 28, the expansion ratio, and the separation dimension (pitch) between the elastic bodies can be changed as appropriate, but in order to be worn stably on the wearer's body It is preferable to set the conditions of each elastic body so that the extension force of the stretchable region by the front and back upper waist elastic bodies 27A and 28A is larger than that of the stretchable region by the front and back lower waist elastic bodies 27B and 28B.

  The inner and outer layer sheets 21 and 23 in the front waist region 13 and the inner and outer layer sheets 22 and 24 in the rear waist region 14 are not coated with hot melt adhesive on their inner surfaces, except for the joint portion by the side seam 18, They are joined to each other only via a hot melt adhesive applied to the front and rear waist elastic bodies 27 and 28, respectively. The hot melt adhesive should just be apply | coated to the part which opposes the inner / outer layer sheets 21-24 in the perimeter of the front-and-back waist elastic bodies 27 and 28. FIG.

  2 and 3, the absorbent chassis 12 includes front and rear end portions 12A and 12B attached to the skin facing surfaces of the front and rear waist panels 16 and 17, and a liquid-absorbent core 43 extending in the longitudinal direction Y at least in the crotch region 15. And a liquid-permeable body-side liner (top sheet) 44 formed from a hydrophilic fiber nonwoven fabric positioned on the skin-facing surface side of the liquid-absorbent core 43; Opposite to the back sheet 45 of at least the liquid-absorbent core 43 disposed between the back sheet 45 formed of a hydrophobic or hardly liquid-permeable fiber nonwoven fabric and the liquid-absorbent core 43 and the back sheet 45 And a liquid-impermeable leak-proof sheet 46 having a size covering the entire surface to be covered. For the body side liner 44 and the back sheet 45, various known fiber nonwoven fabrics such as an SMS fiber nonwoven fabric and a spunbond nonwoven fabric can be used.

  The liquid-absorbent core 43 is a mixture of a required amount of superabsorbent polymer particles and fluff pulp, and has a semi-rigidity higher than that of sheet members such as inner and outer layer sheets 21 to 24 constituting the diaper 10. It has rigidity. Further, the liquid absorbent core 43 has a panel shape in which the central portion in the vertical direction Y has a narrow shape, and the whole is encapsulated with a liquid diffusive sheet such as a tissue.

  The body side liner 44 and the back sheet 45 extend outward from both ends in the longitudinal direction Y of the liquid absorbent core 43, and the extended portions are overlapped with each other via a hot melt adhesive (not shown). By joining together, a pair of end flaps 53 and 54 extending outward in the longitudinal direction Y from both ends of the liquid absorbent core 43 are formed.

  The back sheet 45 has both side portions 47 located on the outer side in the lateral direction X from both side edges of the leak-proof sheet 46. Both side portions 47 are located on both side edges of the leak-proof sheet 46 and are bent toward the skin-facing surface along a bending line extending in the vertical direction Y, and are fixed to the body side liner 44 and separated from each other in the vertical direction. Both end fixing portions 48, a proximal edge portion 49 fixed to both side edge portions of the body side liner 44 and both side edge portions of the leakage preventing sheet 46, and a longitudinal end portion extending between the both end fixing portions and the proximal edge portion And a distal edge 50 (free edge) extending longitudinally in parallel.

  The distal edge portion 50 has a sleeve shape formed by bending and fixing the outer edge portion of the backsheet 45, and a plurality of string-like or strand-like cuff elastic bodies 51 extending in the longitudinal direction are in an extended state. It is fixed to the back sheet 45 in a contractible manner. As the cuff elastic body 51 contracts, the distal edge 50 moves away from the body-side liner 44 toward the wearer's body to form a leak-proof cuff, which fits the wearer's thigh and leaks excrement. To prevent. A plurality of string-like or strand-like leg elastic bodies 52 extending in the longitudinal direction Y can be contracted in an extended state on both sides 47 of the backsheet 45 and outside the lateral direction X of the leak-proof cuff. It is fixed to the back sheet 45.

  On the skin facing surface and the non-skin facing surface of the body side liner 44, as shown in FIGS. 3, 5, and 7, an uneven portion 63 formed by the flange portion 61 and the groove portion 62 is located. The flange portions 61 and the groove portions 62 extend in the vertical direction Y and are alternately arranged in the horizontal direction X. In the lateral direction X, the interval between the flange portions 61 adjacent to each other is 0.5 to 10.0 mm, and the interval between the groove portions 62 adjacent to each other is 0.5 to 10.0 mm. If the distance between the heel part 61 and the groove part 62 is smaller than 0.5 mm, the air permeability inside the diaper 10 cannot be obtained. On the other hand, if it is larger than 10.0 mm, the groove part 62 comes into contact with the wearer's skin and the touch is poor. There is a risk. If the space | interval of the collar part 61 and the groove part 62 is 0.5-10.0 mm, while being able to ensure the air permeability of the inside of the diaper 10, the touch can be made favorable.

  The body side liner 44 can be manufactured by the following method, for example. For example, the body side liner 44 is manufactured from the web by the following welding apparatuses 60 using the web of the fiber nonwoven fabric containing the thermoplastic synthetic fiber 65 as the body side liner 44. FIG.

  As shown in FIGS. 8 and 9, the welding device 60 includes a first roller 66 and a second roller 67. The first roller 66 and the second roller 67 include convex portions 66a and 67a that protrude radially outward from the peripheral surfaces of the first roller 66 and the second roller 67, and a concave portion 66b that is positioned between the convex portions 66a and 67a, 67b. The convex portions 66a and 67a and the concave portions 66b and 67b extend along the peripheral surfaces of the first roller 66 and the second roller 67, and make a round in a manner in which the first roller 66 and the second roller 67 are continuous. The first roller 66 and the second roller 67 are arranged such that the convex portions 66a and 67a and the convex portions 66a and 67a face each other, and the concave portions 66b and 67b and the concave portions 66b and 67b face each other. is there. In the first roller 66 and the second roller 67, a heater (not shown) is incorporated inside the convex portions 66a, 67a in the radial direction, and the peripheral surfaces of the convex portions 66a, 67a are formed by the heater on the synthetic fiber of the web 64. It can be heated to a predetermined temperature at which 65 can be welded. Synthetic fiber which passes the web 64 between a pair of rollers 66 and 67 comprised by these 1st rollers 66 and 2nd rollers 67, and is located between convex part 66a, 67a and convex part 66a, 67a. While the groove portion 62 is formed by welding 65, the flange portion 61 is formed without welding the synthetic fiber 65 positioned between the recess portions 66b and 67b and the recess portions 66b and 67b.

  In the groove portion 62, the thermoplastic synthetic fiber 65 is welded. In the flange portion 61, the thermoplastic synthetic fiber 65 is not welded, and therefore the synthetic fiber 65 is dispersed relative to the groove portion 62. State. For this reason, as shown in FIG. 10, the dimension t1 of the groove part 62 in the thickness direction Z is smaller than the dimension t2 of the flange part 61 in the thickness direction Z. In the groove part 62, since the synthetic fiber 65 is welded, the rigidity of the groove part 62 is larger than the rigidity of the flange part 61. For this reason, even if the compression force is applied to the body side liner 44 in the lateral direction X due to the contraction of the waist elastic bodies 27 and 28, it is possible to suppress the size of the groove 62 from being reduced. For this reason, the air permeability of the skin facing surface of the diaper 10 can be ensured.

  In addition, the body side liner 44 extends so that the heel portion 61 and the groove portion 62 are continuous in the longitudinal direction Y, and the rigidity of the groove portion 62 is larger than the rigidity of the heel portion 61, so Rigidity against force compressing in the longitudinal direction Y is greater than rigidity. For this reason, it is possible to prevent the body side liner 44 from shifting in the vertical direction Y.

  Since the front / rear and lower waist elastic bodies 27B and 28B are positioned, the front / rear and lower waist elastic bodies 27B and 28B contract in the lateral direction X in the worn state, and the body side liner 44 positioned in the front and rear waist regions 13 and 14 On the other hand, in the crotch region 15, since there is no elastic body that contracts in the lateral direction X, the body side liner 44 positioned in the crotch region 15 hardly contracts in the lateral direction X. For this reason, the body side liner 44 has a thickness direction Z between the flange 61 and the groove 62 in the front and rear waist regions 13 and 14 rather than the dimension in the thickness direction Z between the flange 61 and the groove 62 in the crotch region 15. The dimensions increase. By using the front and lower waist elastic bodies 27B and 28B of the front and rear waist regions 13 and 14, the breathability in the portions facing the wearer's stomach and back can be maintained.

The front and rear waist regions 13 and 14 of the diaper 10 cover both end edges 53a and 54a of the end flaps 53 and 54 on the skin facing surface side, while the cover sheet 70 does not overlap with the liquid-absorbent core 43 in plan view. 71. For the cover sheets 70 and 71, for example, an SMS fiber nonwoven fabric or a spunbond fiber nonwoven fabric having a mass of 10 to 30 g / m ² can be used. If the weight of the cover sheets 70 and 71 is less than 10 g / m ² , the required durability may not be obtained, and the cover sheets 70 and 71 may be broken. On the other hand, if the weight is greater than 30 g / m ² , the rigidity may be too high and the touch may be deteriorated. . If the mass of the cover sheets 70 and 71 is 10 to 30 g / m ² , the risk of tearing can be reduced and the touch can be improved. Further, in the present specification, when the liquid absorbent core 43 and the cover sheets 70 and 71 do not overlap in plan view, the connection of the side seams 18 at the side edges 16c and 16d of the front and rear waist panels 16 and 17 is released. It means that the liquid-absorbent core 43 and the cover sheets 70 and 71 do not overlap in a state where the front and rear waist regions 13 and 14 and the crotch region 15 are extended until there is no gather due to contraction of the elastic body.

  As shown in FIGS. 3 and 4, the cover sheet 70 located in the front waist region 13 includes an extension portion 23 b of the outer layer sheet 23 located on the skin facing surface and an end flap 53 in the central portion 72 in the longitudinal direction Y. The outer layer located on the skin facing surface at both ends 72a and 72b in the longitudinal direction Y is fixed to the body side liner 44 located on the skin facing surface of the skin with a joining region 73 such as a hot melt adhesive interposed therebetween. The extension part 23b of the sheet 23 and the body side liner 44 located on the skin facing surface of the end flap 53 are not fixed with non-joining areas 73a and 73b interposed. For this reason, it can suppress that the quantity of a hot-melt-adhesive agent reduces, and the touch of the cover sheet 70 falls. In addition, one end 72 b of the cover sheet 70 located on the inner side in the vertical direction Y (the inner end located on the inner side in the vertical direction Y of the both ends 72 a and 72 b) is the edge 43 a of the liquid-absorbent core 43. Therefore, one end portion 72b of the cover sheet 70 is folded back to the skin facing surface side by hitting the end edge 43a of the liquid-absorbent core 43 during wearing. As described above, when the one end 72b of the cover sheet 70 is folded back to the skin facing surface side, the air flow path formed by the groove 62 of the body side liner 44 is not obstructed by the cover sheet 70. The air permeability inside the diaper 10 can be prevented from being lowered while the amount of the hot melt adhesive is reduced and the touch of the cover sheet 70 is prevented from being lowered.

  As shown in FIGS. 5 and 6, the cover sheet 71 located in the rear waist region 14 is formed on the inner layer sheet 22 located on the skin facing surface and the skin facing surface of the end flap 54 in the central portion 74 in the longitudinal direction Y. While being fixed to the body side liner 44 through a joining region 75 such as a hot melt adhesive, the inner layer sheet 22 located on the skin facing surface and end flaps at both ends 74a and 74b in the longitudinal direction Y The body side liner 44 located on the skin facing surface 54 is not fixed with the non-bonded areas 75a and 75b interposed. For this reason, it can suppress that the quantity of a hot-melt-adhesive agent reduces, and the touch of the cover sheet 71 falls. In addition, since one end (inner end edge) 74a of the cover sheet 71 located inside the longitudinal direction Y is arranged so as to be adjacent to the end edge 43b of the liquid-absorbent core 43, the cover sheet 71 absorbs during wearing. By hitting the end edge 43b of the liquid core 43, one end 74a of the cover sheet 71 is folded back toward the skin facing surface. As described above, when the one end 74 a of the cover sheet 71 is folded back toward the skin facing surface, the air flow path formed by the groove 62 of the body side liner 44 is not obstructed by the cover sheet 71. The air permeability inside the diaper 10 can be prevented from being lowered while the amount of the hot melt adhesive is reduced and the touch of the cover sheet 71 is prevented from being lowered. In the present specification, the inner end portions of the cover sheets 70 and 71 are one end portions 72b and 74a located inside the longitudinal direction Y, and the outer end portions of the cover sheets 70 and 71 are the longitudinal direction Y. The other end portions 72a and 74b located outside.

  Further, since both end edges 53a, 54a of the end flaps 53, 54 are covered with the cover sheets 70, 71, it is indicated that the end edges 53a, 54a of the end flaps 53, 54 hit the skin of the wearer. This can prevent the wearer from feeling uncomfortable. In addition, since the cover sheets 70 and 71 and the liquid-absorbent core 43 do not overlap in plan view, the body-side liner 44 that overlaps (positions) both end edges 43a and 43b of the liquid-absorbent core 43 includes the cover sheet 70, 71 is not covered. As a result, the air flow path formed by the groove 62 of the body side liner 44 continues to both end edges 43a and 43b of the liquid absorbent core 43, so that the air permeability on the skin facing surface side of the diaper 10 can be improved. it can.

  In the rear waist region 14, as shown in FIGS. 5 and 6, the end 24d of the extended portion 24b of the outer layer sheet 24 and the end 74b of the cover sheet 71 on the skin facing surface are separated in the vertical direction Y. Therefore, only the main portion 24 a of the inner layer sheet 22 and the outer layer sheet 24 is located between the end portion 24 d of the extending portion 24 b and the end portion 74 b of the cover sheet 71. The portion where only the inner layer sheet 22 and the main body portion 24a are located has low rigidity because the number of stacked sheets is small, and even when excrement such as stool is discharged to the diaper 10 during wearing, the inner layer sheet 22 and A portion where only the main body portion 24a is located serves as a buffer region, and the outer edge 17b of the rear waist region 14 can be prevented from shifting downward.

  In the rear waist region 14, the extended portion 24 b of the outer layer sheet 24 includes an end portion (inner end portion) 24 d located inside the longitudinal direction Y, and an end portion (outer end portion) 24 e located outside in the longitudinal direction. The central portion 24f is positioned between the both end portions 24d and 24e, and the central portion 24f is fixed to the inner layer sheet 22 via a joining region 81 such as a hot-melt adhesive, while the both end portions 24d , 24e are provided with non-bonding areas 82a, 82b that are not coated with a hot melt adhesive or the like and are not fixed to the inner sheet 22. For this reason, it can suppress that the quantity of a hot-melt-adhesive agent reduces, and the touch of the extension part 24b of the outer layer sheet 24 falls. In addition, the extended portion 24b of the outer layer sheet 24 has a non-bonding region 82a that is not fixed to the inner layer sheet 22 at one end portion (inner end portion) 24d in the longitudinal direction Y. When excrement such as urine is discharged and the rear waist region 14 of the diaper 10 is shifted downward due to gravity, a non-joining region 81a is formed at one end (inner end) 24d in the longitudinal direction Y of the extension 24b. Since it is located, one end part (inner end part) 24d in the extension part 24b comes into contact with the skin of the wearer and is folded back to the skin facing surface side. When one end portion (inner end portion) 24d of the extension portion 24b is folded back to the skin facing surface side in this way, the air flow path formed by the groove portion 62 of the body side liner 44 becomes the extension portion 24b. Therefore, it is possible to prevent the air permeability of the diaper 10 from being lowered while reducing the amount of the hot melt adhesive and preventing the touch of the extending portion 24b from being lowered.

  In the front waist region, as shown in FIGS. 3 and 4, the end portion 23 d of the extending portion 23 b of the outer layer sheet 23 on the skin facing surface and the end portion 70 a of the cover sheet 70 overlap with each other. The portion where the end portion 23d of the extending portion 23b of the 23 overlaps the end portion 70a of the cover sheet 70 has a high rigidity. For this reason, even if force is applied to the diaper 10 from the outside during wearing, the diaper 10 can be prevented from shifting.

  In the above-described embodiment, the center portions 72 and 74 in the longitudinal direction Y of the cover sheets 70 and 71 are the end flaps 53 and 54 and the extended portions 23 b and 24 b of the outer layer sheets 23 and 24 or the inner layer sheets 21 and 22. The two end portions 72a, 72b, 74a, 74b in the longitudinal direction Y are fixed to the end flaps 53, 54 and the outer layer sheets 23, 24 by the non-joining regions 73a, 73b, 75a, 75b. The extension parts 23b, 24b or the inner layer sheets 21, 22 are not fixed. However, the present invention is not limited thereto, and one of the end portions (inner end portions) 72b and 74a located on the inner side in the vertical direction Y among the end portions 72a, 72b, 74a and 74b of the cover sheets 70 and 71 are end flaps. What is necessary is just to be fixed to 53,54.

  Further, in the above-described embodiment, the body side liner 44 has been described as having the concave and convex portion 63 formed of the heel portion 61 and the groove portion 62 on both the skin facing surface and the non-skin facing surface. However, the present invention is not limited to this, and the body side liner may be provided with an uneven portion 63 formed of the heel portion 61 and the groove portion 62 only on the skin facing surface.

  As long as there is no special description, the member which comprises the diaper 10 can use the well-known material normally used in this kind of field | area other than the material described in this specification without a restriction | limiting. . Further, terms such as “first” and “second” used in the present specification are merely used to distinguish similar elements, positions, and the like.

10 Disposable diapers (disposable wearing articles)
12 liquid absorption structure 13 front waist region 14 rear waist region 15 crotch region 16c both side edges 16d of front waist region both side edges 19 of rear waist region waist opening 23 outer layer sheet (waist sheet)
23a Main part 23b Extension part 23c Bending part 23d End part 24 Outer layer sheet (waist sheet)
24a Main part 24b Extension part 24c Bending part 24d End part 43 Absorbent core 43a End edge 43b End edge 44 Body side liner 53 End flap 53a End edge 54 End flap 54a End edge 61 Gutter part 62 Groove part 65 Synthetic fiber 70 Cover sheet 71 located in the front waist region Cover sheet 72 located in the rear waist region Central portion 72b One end portion (inner end portion) of the cover sheet located inside in the vertical direction in the front waist region
74 Center part 74a One end part (inner end part) of the cover sheet located inside the longitudinal direction in the rear waist region
X Horizontal direction Y Vertical direction Z Thickness direction

Claims (6)

The horizontal and vertical direction and a thickness direction, and a skin-facing side and a non-skin facing surface, a front waist region, a rear waist region, a crotch region extending between said front and rear waist regions, at least the crotch In a disposable wearing article having a waist opening that is defined by fixing both side edges of the front and rear waist regions to each other.
The liquid-absorbing structure includes a liquid-permeable body-side liner located on the skin-facing surface side, a liquid-absorbing core located on the non-skin-facing surface side of the body-side liner, and the liquid-absorbing core. End flaps extending outward in the longitudinal direction from both end edges,
On the skin-facing surface of the body-side liner, uneven portions formed from ridges and groove portions that extend in the vertical direction and are alternately arranged in the horizontal direction are located,
The front and rear waist regions have an inner layer sheet positioned on the skin facing surface side, an outer layer sheet positioned on the non-skin facing surface side, and a cover sheet that covers both end edges of the end flap,
The cover sheet and the liquid absorbent core do not overlap in plan view ,
The outer layer sheet includes a main body portion located on the non-skin facing surface, an extending portion extending outward from the main body portion in the longitudinal direction to define a part of the skin facing surface, and the main body portion. A bent portion located between the extension portion and
The inner end portion located on the inner side in the longitudinal direction of the extending portion in the outer layer sheet of the front waist region is located between the cover sheet and the main body portion in the thickness direction,
An inner end portion located on the inner side in the longitudinal direction of the extending portion in the outer layer sheet in the rear waist region and an outer end portion located on the outer side in the longitudinal direction of the cover sheet are separated in the plan view. The cover sheet is arranged to
The wearing article , wherein the inner end portion of the extending portion of the outer layer sheet is located on the outer side in the longitudinal direction of the outer end portion of the cover sheet . The body side liner is formed from a nonwoven fabric containing thermoplastic synthetic fibers,
In the groove portion, the synthetic fiber is in a welded state,
2. The wearing article according to claim 1, wherein the synthetic fiber is not welded at the collar portion, and thus the synthetic fibers are dispersed with respect to the groove portion.   The wearing article according to claim 1, wherein the body side liner has greater rigidity in the longitudinal direction than in the lateral direction.   The body-side liner has a larger dimension in the thickness direction between the buttock and the groove in the front and rear waist region than a dimension in the thickness direction between the buttock and the groove in the crotch region. The wearing article in any one of 1-3. The front-rear waist region includes an inner sheet positioned on the skin facing surface side, an outer sheet positioned on the non-skin facing surface side, and an elastic member positioned between the inner sheet and the outer sheet. ,
When the elastic member contracts in the lateral direction, the body side liner has the heel portion in the front and back waist region and the dimension in the thickness direction of the heel portion and the groove portion in the crotch region. The wearing article according to claim 4, wherein the dimension in the thickness direction with the groove portion is increased.   The wearing article according to claim 5, wherein a central portion in the longitudinal direction of the cover sheet is fixed to the end flap, and at least an inner end portion of the inner and outer end portions in the vertical direction is not fixed to the end flap. .

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