JP2016112234A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which effectively prevents exudation of excretion through a leakage prevention cuff.SOLUTION: Leakage prevention cuffs 34 of an absorbent article are joined to a surface sheet 31 while both end part areas along a longitudinal direction X are put down inward, and have standing property toward a body of a wearer. The surface sheet 31 comprises projection portions 50 which project in a width direction Y beyond both side edges of an absorber 33 and are not joined to the absorber 33. The projection portion 50 has an uneven structure consisting of a plurality of projections, which project toward the body of the wearer, and recesses. The projection portion 50 is folded back toward the body side of the wearer and comes into contact with an inner surface of the leakage prevention cuff 34 along the standing leakage prevention cuff 34 in a non-joint state.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  Since loose stool has higher viscosity than urine, it takes time for it to be taken into the absorber compared to urine. As a result, before the absorbent body is completely absorbed, loose stool may flow along the top sheet, causing side leakage. Leak-proof cuffs for preventing side leakage are often placed on both sides of the absorbent article, but the loose stool that reaches the leak-proof cuff enters the gap between the leak-proof cuff and the absorber, It may ooze from the leak-proof cuff.

  In order to prevent excrement from flowing out on the top sheet, Patent Document 1 discloses a non-facing surface on the opposite side of the surface facing the core material in the liquid-permeable sheet of the absorbent article. Techniques for covering with a liquid-permeable covering sheet have been proposed. The covering sheet has a plurality of ridges and valleys extending in parallel in the front-rear direction. In the crotch region, the covering sheet has a central region in the width direction in which the back surface is joined to the non-opposing surface of the liquid-permeable sheet, and the back surface is on the outer side of each side of the central region, and the back surface is not against the non-opposing surface. And a side region in a joined state. The side region includes at least one of the troughs and at least one of the crests located on the outer side in the lateral direction from the troughs, and the non-opposing in the thickness direction of the liquid-permeable sheet. It can be separated from the surface. According to this absorbent article, since the side area can be separated from the non-opposing surface of the liquid-permeable sheet below it, the back flow of body fluid from the core material to the skin is suppressed in the side area, and the back flow It is described in the same literature that the body fluids are less likely to wet the skin.

  Patent Document 2 describes an absorbent article including a top sheet having a plurality of concave portions and a plurality of convex portions. The plurality of concave portions are formed by relatively reducing the thickness of the top sheet in a joining region where the top sheet and the lower layer sheet positioned below the top sheet are joined. The plurality of convex portions are formed by relatively increasing the thickness of the top sheet in the non-bonded region between the top sheet and the lower layer sheet.

JP 2010-119460 A JP 2013-169388 A

  However, in the techniques described in Patent Documents 1 and 2, when excrement such as loose stool reaches the leak-proof cuff, it is not easy to prevent the excrement from seeping out through the leak-proof cuff.

  Accordingly, an object of the present invention is to improve an absorbent article, and more specifically, to provide an absorbent article capable of preventing exudates from leaking through a leak-proof cuff.

The present invention is an absorbent article in which a pair of leak-proof cuffs extending in the longitudinal direction are disposed on both sides in the width direction, and a liquid-permeable surface sheet is disposed on the skin contact surface side of the absorbent body. And
The leak-proof cuff is joined to the top sheet in a state where both end regions along the longitudinal direction are inwardly lying, and has a propensity to stand toward the wearer's body,
The surface sheet is bonded to the absorber in a region overlapping with the absorber, and has a protruding portion that protrudes in the width direction beyond both side edges of the absorber and is not bonded to the absorber. Have
The projecting portion has a concavo-convex structure composed of a plurality of convex portions projecting toward the wearer's body and concave portions located between the convex portions,
The overhanging portion provides an absorbent article that is folded toward the wearer's body and is in contact with the inner surface of the leak-proof cuff in a non-joined state along the standing leak-proof cuff. is there.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article in which the exudation of the excretion through the leak-proof cuff was prevented effectively is provided.

FIG. 1 is a perspective view showing a usage state of a pants-type disposable diaper as an embodiment of the absorbent article of the present invention. FIG. 2 is a partially broken plan view showing a developed and extended state of the pants-type disposable diaper shown in FIG. The expanded and extended state means that the joints (side seal portions) existing on both sides of the pant-type disposable diaper are peeled off, the diaper is in the expanded state, and the elastic member of each part is extended to the expanded diaper. It means a state where it is expanded to the design dimension (same as the dimension when it is expanded in a flat shape without any influence of the elastic member). FIG. 3 is a cross-sectional view taken along the line III-III in the crotch part of the diaper shown in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is an enlarged perspective view showing an overhang part. FIG. 6 is an enlarged view of a main part of the cross-sectional view shown in FIG. FIGS. 7A and 7B are cross-sectional views in the diaper width direction showing a state in which the overhanging portion is folded back with the standing of the leak-proof cuff. FIGS. 8A and 8B are cross-sectional views in the diaper width direction showing a state in which the leak-proof cuff stands but the overhanging portion is not folded back. Fig.9 (a) is a perspective view which shows another embodiment of an overhang | projection site | part, FIG.9 (b) is thickness direction sectional drawing in Fig.9 (a).

  The present invention will be described below based on preferred embodiments with reference to the drawings. A pants-type disposable diaper 1 (hereinafter also referred to as diaper 1) according to an embodiment of the present invention is a rectangular abdominal sheet member 2A disposed on the abdomen side of a wearer, as shown in FIGS. The rectangular back side sheet member 2B arranged on the wearer's back side, and the absorptive main body 3 fixed over the abdomen side sheet member 2A and the back side sheet member 2B are provided. Then, the positions of the upper end edges 2Ae, 2Be and the positions of the lower end edges 2Af, 2Bf of the ventral sheet member 2A and the dorsal sheet member 2B are matched to each other, and both side edges 2a, 2a of the ventral sheet member 2A A pair of side seal portions 4 and 4 are formed by joining the side edges 2b and 2b of the back seat member 2B.

  As shown in FIGS. 1 and 2, the diaper 1 is, when worn, an abdominal side A disposed on the stomach side of the wearer, a back side B disposed on the back side of the wearer, and an abdominal side A. And a crotch part C disposed between the crotch part of the wearer. The longitudinal direction (article longitudinal direction) of the diaper 1 is a direction extending from the abdominal side A through the crotch C to the back side B or the opposite direction (X direction in FIG. 2), and the width direction of the diaper 1 (article width). (Direction) is a direction along the wearer's waistline direction, and is a direction (Y direction in FIG. 2) intersecting the longitudinal direction of the article.

  The ventral sheet member 2 </ b> A has a horizontally long rectangular shape along the width direction Y when the diaper 1 is expanded and expanded (see FIG. 2). Similarly, the back sheet member 2B has a horizontally long rectangular shape when the diaper 1 is unfolded and extended (see FIG. 2). As shown in FIG. 2, the ventral sheet member 2 </ b> A and the dorsal sheet member 2 </ b> B have a uniform length in the longitudinal direction X in the width direction Y.

  And the side edge 2a of the abdominal sheet member 2A and the side edge 2b of the back sheet member 2B are joined at the pair of side seal parts 4 and 4 described above to form a cylindrical waistline part. Yes. For this joining, known joining means such as a heat seal, a high frequency seal, an ultrasonic seal, and an adhesive are used. Moreover, the waist opening part 5 and a pair of leg opening parts 6 and 6 are formed with the side seal parts 4 and 4 by this joining.

  As shown in FIGS. 2 and 3, the absorbent main body 3 of the diaper 1 is disposed between a liquid-permeable top sheet 31, a liquid-impermeable or water-repellent back sheet 32, and both sheets 31 and 32. It has a liquid-retaining absorbent 33 and is formed in a rectangular shape that is long in the longitudinal direction X. The top sheet 31 is disposed on the skin contact surface side of the absorber 33. The back sheet 32 is disposed on the non-skin contact surface side of the absorber 33. The absorbent 33 includes an absorbent core 33a made of an aggregate of fibers such as pulp fibers (which may be a non-woven fabric), or an absorbent core 33a in which particles of a water-absorbing polymer are held, and the absorbent core It consists of a core wrap sheet 33b covering 33a. The absorber 33 is also formed in a rectangular shape that is long in the longitudinal direction X. As the back surface sheet 32 and the absorbent core 33a and the core wrap sheet 33b of the absorbent body 33, the same materials as those conventionally used for this type of absorbent article can be used. Although not shown, an outer sheet such as a non-woven fabric or a film can be disposed on the outer side of the absorbent main body 3 in the crotch portion C so as to overlap the back sheet 32.

  A pair of leak-proof cuffs 34, 34 extending in the longitudinal direction X are disposed at positions on both sides in the width direction Y of the diaper 1. The leak-proof cuff 34 is made of a liquid-resistant or water-repellent and breathable material. Each leakage prevention cuff 34 has a base end portion 34a and a free end portion 34b extending in the longitudinal direction. In the vicinity of the free end portion 34b, a leak-proof cuff elastic member 35 is disposed in an extended state. While the diaper 1 is worn, the leak-proof cuff elastic member 35 contracts, so that the leak-proof cuff 34 stands up toward the wearer's body and prevents liquid from flowing out of the absorbent main body 3 outward in the width direction. Is done.

  As shown in FIG. 3, the leak-proof cuff 34 has a base end portion 34 a at a position between the back sheet 32 and the absorber 33. Specifically, among the sheets constituting the leak-proof cuff 34, the portions near the base end 34 a are sandwiched between the back sheet 32 and the absorber 33, and these are bonded and fixed by the adhesive 38. ing. The leak-proof cuff 34 has a base end portion 34a at the position of the side edge of the absorber 33 or at a position closer to the inside in the width direction than the side edge. As a result, a space 39 can be formed between the absorber 33 and the leak-proof cuff 34. This space 39 can temporarily store excrement such as urine.

  The leak-proof cuff 34 is disposed over the entire area in the longitudinal direction X of the absorbent main body 3. As shown in FIG. 4, the leak-proof cuff 34 is joined to the topsheet 31 in a state where both end regions 341 along the longitudinal direction X are inwardly laid down. The leak-proof cuff 34 lying inward is joined to the top sheet 31 facing the leak-proof cuff 34 by an adhesive 40. The leak-proof cuff 34 is in a non-bonded state with the topsheet 31 between both end regions 341. At least the elastic member 35 described above is disposed on the free end 34b of the non-bonded portion of the leak-proof cuff 34. With these structures, the leak-proof cuff 34 has a propensity to stand toward the wearer's body. “Inclination inward” means to lie down toward the center of the absorbent body 3 in the width direction Y.

  As shown in FIG. 3, the absorbent main body 3 is positioned at the outer position in the width direction Y than the leak-proof cuff 34 and at the outer positions on both side edges in the longitudinal direction X of the absorbent body 33. Leg cuffs 36, 36 extending to X are provided. Elastic members 37, 37 extending in the longitudinal direction X are attached to the free end of the leg cuff 36 in an extended state. The leg cuff 37 is adapted to fit around the leg of the wearer when the diaper 1 is worn. The leg cuff 36 is formed by a portion of the back sheet 32 that extends outward in the width direction Y from each side edge of the absorber 33. The leg cuff 36 is integrated with the back sheet 32.

  As for the absorptive main body 3, the one end side (part which overlaps with the back side sheet member 2B) of the longitudinal direction X is fixed to the center area | region of the width direction Y of the back side sheet member 2B via an adhesive agent (not shown). Has been. Further, the absorbent main body 3 has an adhesive (not shown) in the central region in the width direction Y of the ventral sheet member 2A at the other end side in the longitudinal direction X (the portion overlapping the ventral sheet member 2A). Is fixed through.

  As shown in FIG. 2, the ventral sheet member 2 </ b> A and the back sheet member 2 </ b> B in the diaper 1 are both an outer sheet 22 that forms the outer surface of the diaper, an inner sheet 23 that is disposed on the inner surface side of the outer sheet 22, And a plurality of thread-like elastic members 24 disposed between the sheets 22 and 23. The elastic member 24 extends along the width direction Y. Thereby, the ventral sheet member 2 </ b> A and the dorsal sheet member 2 </ b> B develop stretchability along the width direction Y.

  The principal part enlarged view of the surface sheet 31 in the diaper 1 is shown by FIG. The topsheet 31 has an upper-layer nonwoven fabric 43 having a concavo-convex structure in which streaky ridges 41 and ridges 42 extending in one direction are alternately arranged in the width direction. The “one direction” in which the protruding line portions 41 and the recessed line portions 42 extend is the same direction as the longitudinal direction X of the diaper 1. The topsheet 31 has a lower layer nonwoven fabric 44 that is adjacent to the upper layer nonwoven fabric 43 and located on the absorber side. The upper layer nonwoven fabric 43 is joined to the adjacent lower layer nonwoven fabric 44 and the joint portion 45 at the concave strip portion 42, and the convex strip portion 41 has a hollow structure between the upper layer nonwoven fabric 43 and the lower layer nonwoven fabric 44.

  The upper non-woven fabric 43 is positioned between a plurality of protruding ridges 41 and the adjacent protruding ridges 41, 41 whose cross-sectional shapes on both the front and back surfaces are convex upward in the thickness direction (Z direction). It has a recess 42. The concave section 42 has a convex shape in which the cross-sectional shapes of both the front and back surfaces are downward in the thickness direction (Z direction) of the nonwoven fabric 43. Each of the plurality of ridges 41 extends continuously in the longitudinal direction X, and each of the plurality of ridges 42 also has a groove shape extending continuously in the longitudinal direction X of the upper nonwoven fabric 43. The protruding line portions 41 and the recessed line portions 42 are parallel to each other and are alternately arranged in the width direction Y.

  The height H (see FIG. 5) of the ridges 41 is 0.3 mm or more in order to ensure that the advantageous effects described later that are achieved by the diaper 1 of the present embodiment are reliably exhibited. Preferably, it is 0.5 mm or more, more preferably 5 mm or less, and further preferably 2 mm or less. Specifically, the height H of the ridge 41 is preferably 0.3 mm or more and 5 mm or less, and more preferably 0.5 mm or more and 2 mm or less. The height H of the ridge 41 is measured as follows. Using a feather razor (part number FAS-10, manufactured by Feather Safety Razor Co., Ltd.), the top sheet 31 is cut along the thickness direction Z so as to pass through the point where the ridges 41 are highest. The height H is measured by enlarging the cross section of the top sheet 31 with a Keyence digital microscope VHX-900 by about 20 times. The measurement is performed at three locations, and the arithmetic average is taken as the height H of the convex portion 41.

  The concavo-convex structure of the topsheet 31 composed of the ridges 41 and the ridges 42 is preferably formed at least in a protruding portion 50 described later, which is a portion located in the width direction Y of the diaper 1. Moreover, it is also preferable that this uneven structure is formed at least in the central region in the longitudinal direction X of the diaper 1. Furthermore, it is preferable that the concavo-convex structure is formed in the projecting portion 50 over the entire region in the longitudinal direction X of the absorber 33. In particular, the concavo-convex structure is preferably formed over the entire area in the longitudinal direction X and the width direction Y of the diaper 1.

  The upper layer nonwoven fabric 43 and the lower layer nonwoven fabric 44 can be comprised from various nonwoven fabrics, such as an air through nonwoven fabric, a spun bond nonwoven fabric, a spun lace nonwoven fabric, a melt blown nonwoven fabric, a resin bond nonwoven fabric, a heat roll nonwoven fabric, a needle punch nonwoven fabric, for example. Any two or more laminates of these nonwoven fabrics, for example, a spunbond-meltblown (SM) nonwoven fabric or a spunbond-meltblown-spunbond (SMS) nonwoven fabric can also be used.

  Returning to FIG. 3, the top sheet 31 is joined to the skin contact surface of the absorber 33 in a region overlapping the absorber 33 in the plan view. For the joining of both, a method that does not hinder the liquid transfer from the top sheet 31 to the absorber 33 is used. Examples of such a joining method include a method such as intermittent application of the adhesive 20 as shown in FIG. It is preferable that the bonding area between the two covers at least the entire area in the width direction Y, and more preferably covers the entire area in the width direction Y and the entire area in the longitudinal direction X in the area where the topsheet 31 and the absorber 33 overlap.

  As shown in FIG. 3, the top sheet 31 has a pair of projecting portions 50 that project in the width direction beyond both side edges of the absorber 33. The overhang portion 50 is a substantially rectangular region extending along the longitudinal direction X in the plan view of the diaper 1. In the following description, in comparison with the overhanging portion 50, a portion of the topsheet 31 that is located between both side edges of the absorber 33 is referred to as a “central portion 51”. The overhang part 50 is provided at least in the crotch part C of the diaper 1, and is preferably provided in both the abdominal part A and the back part B in addition to the crotch part C. The length along the longitudinal direction X of the overhanging portion 50 is the same as the length along the longitudinal direction X of the absorber 33, or is longer or shorter than that.

  The overhang part 50 is not joined to the absorber 33. In this case, the whole area of the overhanging part 50 may be in a non-bonded state with the absorber 33, or a part thereof may be in a non-bonded state with the absorber 33. From the viewpoint that the flexibility of the leak-proof cuff 34, in particular, the flexibility in the longitudinal direction X of the leak-proof cuff 34 is difficult to be hindered, the entire area of the overhanging portion 50 is not joined to the absorber 33. preferable. In addition to this, it is preferable that the overhanging portion 50 is in a non-bonded state with members other than the absorber 33. That is, it is preferable that the overhang | projection site | part 50 is a non-joining state with respect to any member which comprises the diaper 1. FIG. This makes it difficult to prevent the leak-proof cuff 34 from following the wearer's movement when worn.

  Similar to the central portion 51, the overhang portion 50 has a concavo-convex structure including a plurality of convex portions projecting toward the wearer's body and concave portions located between the convex portions. Specifically, like the central portion 51, the ridges 41 and the ridges 42 as shown in FIG. 5 are formed on the skin contact surface side in the protruding portion 50. The ridges 41 and the ridges 42 extend along the longitudinal direction X and are alternately arranged in the width direction. Thereby, the overhang | projection site | part 50 has a ridge groove structure in the skin contact surface side. The ridges and the ridges formed in the overhanging portion 50 are formed over the entire area along the longitudinal direction X of the overhanging portion 50. In particular, it is preferable that the concavo-convex structure including the ridge groove structure is formed in the projecting portion 50 over the entire region in the longitudinal direction X of the absorbent body 33.

  The ridges and recesses formed in the projecting part 50 have the same shape and the same dimensions as the ridges and recesses 42 formed in the central part 51. The overhang part 50 is formed as an extended part from the central part 51, and both parts are connected integrally.

  In contrast to the protruding portion 50 having a concavo-convex structure on the skin contact surface side, the non-skin contact surface side is flat. Also in the central region 51, the non-skin contact surface side is flat.

  The topsheet 31 including the overhanging portion 50 shown in FIG. 5 is formed by applying a concavo-convex process to a pair of tooth gap rolls that mesh with each other through the nonwoven fabric raw material, and joining the nonwoven fabric raw material that has been subjected to the concavo-convex processing to another nonwoven fabric raw material. Can be manufactured. As said tooth gap roll, what the convex part and recessed part which extend along the axial direction of a roll are alternately arrange | positioned along the rotation direction of a roll can be used.

  As shown in FIG. 3, each overhang | projection site | part 50 is return | folded toward the wearer's body side. The overhanging portion 50 in the folded state is in contact with the inner surface of the leak-proof cuff 34 in a non-joined state along the leak-proof cuff 34 in the standing state. The non-skin contact surface side of the overhang portion 50 is in contact with the inner surface of the leak-proof cuff 34. Since the non-skin contact surface of the overhanging portion 50 is a flat surface as described above, the overhanging portion 50 is in close contact with the inner surface of the leak-proof cuff 34 with almost no gap.

  According to the diaper 1 having the above configuration, the inner surface in the vicinity of the base end portion 34 a of the leak-proof cuff 34 is covered with the overhanging portion 50, so excrement, particularly soft stool, is caused by the leak-proof cuff 34 and the absorber 33. The unintentional entry into the defined space 39 is effectively prevented, thereby effectively exuding excrement through the leak-proof cuff 34 which is a member defining the space 39. Is prevented. Further, when the excrement flowing out on the top sheet 31 reaches the overhanging portion 50 in a state of being folded back toward the wearer's body, the overhanging portion 50 causes moisture in the excrement, for example, in loose stool. Of water is filtered out by the overhang site 50. In this case, since the protruding portion 50 and the top sheet 31 are not joined to the side portion of the absorber 33, moisture is absorbed from the side portion of the absorber 33 into the absorber 33. Excrements such as loose stool from which moisture has been filtered out are difficult to move on the top sheet 31 due to the increase in viscosity, thereby preventing side leakage reliably. In particular, since the uneven structure is formed on the skin contact surface side of the overhanging portion 50, the surface area on the skin contact surface side increases, thereby improving the filterability of moisture from excrement. To do. Further, the overhanging portion 50 is folded back toward the wearer's body and is in contact with the inner surface of the leak-proof cuff 34 in a non-joined state along the standing leak-proof cuff. Even when the standing state of the leak-proof cuff 34 changes due to the movement of the wearer or the like, the protruding portion 50 only shifts the position of contact with the inner surface of the leak-proof cuff 34, and the leak-proof cuff 34 is appropriately Therefore, the shape of the space 39 is easily maintained. As a result, the excretion of the excrement is effectively suppressed.

  Moreover, since the overhanging portion 50 is not joined to the inner surface of the leak-proof cuff 34, the flexibility of the leak-proof cuff 34, in particular, the flexibility in the longitudinal direction X of the leak-proof cuff 34 is hardly disturbed. There are also advantages. In addition, since the overhang portion 50 has an uneven structure, the overhang portion has higher rigidity than when the overhang portion has a flat structure, and as a result, the overhang portion in the wearing state of the diaper 1. 50 is less likely to occur.

  Furthermore, since both the central part 51 and the overhanging part 50 of the topsheet 31 have a groin structure extending along the longitudinal direction X of the diaper 1, excrement is guided to the groin structure, It becomes easy to be spread | diffused toward the edge part side of the longitudinal direction X of the diaper 1. FIG. As a result, side leakage of the diaper 1 and exudation of excrement through the leak-proof cuff 34 are effectively prevented.

  Further, as shown in FIG. 4, both end regions 341 in the longitudinal direction X of the leak-proof cuff 34 are inwardly folded and joined to the surface sheet 31, so that the end regions 341 along the overhanging portion 50. The excrement that has flown into the end region 341 changes in the width direction Y inward. This also effectively prevents side leakage. The fact that both end regions 341 of the leak-proof cuff 34 are inwardly inclined contributes to improvement in the adhesion between the inner surface of the leak-proof cuff 34 and the non-skin contact surface of the overhanging portion 50, and consequently the overhanging portion. 50 contributes to facilitating along the leak-proof cuff 34. A similar effect is obtained when the leak-proof cuff 34 stands up with the position of the side edge of the absorber 33 or the position closer to the inside in the width direction Y than the side edge as the base end 34a. Even more prominent.

  Furthermore, as described above, since the non-skin contact surface of the overhanging portion 50 is a flat surface, the frictional force between the non-skin contact surface and the inner surface of the leak-proof cuff 34 can be reduced. As a result, when the leak-proof cuff 34 stands up toward the wearer's body, the overhanging portion 50 tends to be folded back toward the wearer's body following the standing of the leak-proof cuff 34.

  FIG. 6 shows an enlarged view of a main part of a cross section in the thickness direction along the width direction Y of the diaper 1 shown in FIG. As shown in the figure, the overhang width in the width direction Y of the overhang portion 50 is defined as E. Further, the distance between the base end portion 34a and the free end portion 34b of the leak-proof cuff 34, that is, the height of the leak-proof cuff 34 is defined as D, and the thickness of the absorber 33 is defined as T. At this time, it is preferable that a relationship of T <E <DT is established among these three parties. Thus, by adjusting each dimension, when the leak-proof cuff 34 stands upright, the non-skin contact surface of the overhang | projection site | part 50 comes to be turned back successfully along the inner surface of the leak-proof cuff 34. This will be described with reference to FIGS. 7 (a) and 7 (b).

  FIG. 7A is a cross-sectional view in the width direction showing a state in the middle of manufacturing the diaper 1 in which the above relationship is established between the dimensions E, D, and T. FIG. The state shown in the figure shows a state before both end regions (not shown) of the leak-proof cuff 34 are laid down and fixed toward the surface sheet 31 side. In this state, the leak-proof cuff 34 is in a flat state having a free end portion 34 b on the outer side in the width direction Y and is positioned on the leg cuff 36. Further, the projecting portion 50 of the topsheet 31 extends outward in the width direction Y from the side edge of the absorber 33 and is positioned on the leak-proof cuff 34 in a non-joined state with the leak-proof cuff 34.

  When the manufacturing process proceeds from the state shown in FIG. 7 (a) and the both end regions (not shown) of the leak-proof cuff 34 are laid down and fixed toward the surface sheet 31 side, the process is completed. ), The leakage prevention cuff 34 is given a standing tendency toward the wearer's body, and stands up away from the leg cuff 36. Due to the standing of the leak-proof cuff 34, the overhanging portion 50 located on the leak-proof cuff 34 is successfully turned back toward the wearer's body following the standing of the leak-proof cuff 34. .

  On the other hand, as shown in FIG. 8A, when the overhang width E in the width direction Y of the overhang portion 50 is equal to or smaller than the thickness T of the absorbent body 33, the leak-proof cuff 34 Even when the standing propensity is given and the leak-proof cuff 34 stands up toward the wearer's body, the overhanging portion 50 becomes difficult to follow the upright, and as shown in FIG. The part 50 is in a state of hanging from the side of the absorber 33 and is likely to be positioned between the standing leak-proof cuff 34 and the side of the absorber 33.

  If the overhang width E in the width direction Y of the overhang portion 50 is equal to or greater than the value obtained by subtracting the thickness T of the absorber 33 from the height D of the leak-proof cuff 34, the leak-proof cuff When 34 stands up, the overhanging portion 50 is also folded back toward the wearer's body, but the overhanging width E is too long, so that the weight of the overhanging portion 50 is likely to be kinked. Become.

  FIGS. 9A and 9B show another embodiment of the overhanging portion 50. The overhanging portion 50 shown in these drawings has an upper layer nonwoven fabric 61 and a lower layer nonwoven fabric 62 laminated on each other. The upper nonwoven fabric 61 and the lower nonwoven fabric 62 are in direct contact with each other, and no other layer is interposed between the nonwoven fabrics 61 and 62. The upper layer nonwoven fabric 61 has a first surface 61a and a second surface 61b opposite to the first surface 61a. The lower layer nonwoven fabric 62 has a first surface 62a and a second surface 62b opposite to the first surface 62a. The upper layer nonwoven fabric 61 and the lower layer nonwoven fabric 62 are laminated so that the upper layer nonwoven fabric second surface 61b and the lower layer nonwoven fabric first surface 62a face each other. The upper non-woven fabric first surface 61a forms a skin contact surface at the overhanging portion 50. On the other hand, the lower layer nonwoven fabric second surface 62b forms a non-skin contact surface at the overhanging portion 50.

  The upper non-woven fabric 61 and the lower non-woven fabric 62 are partially bonded by thermal fusion, thereby forming a large number of bonding portions 63. The upper layer nonwoven fabric 61 protrudes in a direction away from the lower layer nonwoven fabric 62 at a non-joined portion surrounded by the plurality of joined portions 63 to form a large number of convex portions 64. A concave portion 65 is formed between the adjacent convex portions 64. The bottom of the recess 65 includes a joint 63. Accordingly, a concavo-convex structure including the convex portions 64 and the concave portions 65 is formed on the upper-layer nonwoven fabric first surface 61a side that forms the skin contact surface of the overhang portion 50. On the other hand, the lower nonwoven fabric second surface 62b side forming the non-skin contact surface of the overhanging portion 50 is in a flat state.

  The convex part 64 has a hollow structure. Specifically, in the convex portion 64, a hollow space defined by the second surface 61 b of the upper layer nonwoven fabric 61 and the first surface 62 a of the lower layer nonwoven fabric 62 is formed therein. On the other hand, in the recess 65, the upper layer nonwoven fabric 61 and the lower layer nonwoven fabric 62 are in close contact with each other, and there is substantially no space between both layers.

  The convex portions 64 are arranged in a staggered pattern. The recesses 65 are also arranged in a staggered pattern. The shape and dimension of each convex part 64 are substantially the same. The same applies to each recess 65. In a plan view from the upper layer nonwoven fabric 61 side of the overhang portion 50, the convex portion 64 has a substantially circular shape. The convex portion 64 has one apex portion 64a at a substantially central portion of the substantially circular convex portion 64 in plan view. Thus, in the present embodiment, the convex portions 64 are dispersedly arranged in the form of dots on the skin contact surface side of the protruding portion 50.

  As shown in FIG. 9B, when the cross section in the thickness direction Z passing through the top portion 64 a of the convex portion 64 is viewed, both of the first surface 61 a and the second surface 61 b of the upper layer nonwoven fabric 61 constituting the convex portion 64 are used. However, the convex curve which protruded toward the upper layer nonwoven fabric 61 side from the lower layer nonwoven fabric 62 side is drawn. The shape of this convex curve is the same in any cross section in the thickness direction Z passing through the top 64a. Thus, the convex part 64 has a substantially hemispherical shell shape.

  The height of the convex part 64 can be made the same as the height H of the convex part 41 in the overhang | projection site | part 50 shown in FIG. The definition of the height of the convex portion 64 and the method of measuring the height can be the same as in FIG.

  The overhang part 50 of this embodiment can be manufactured according to the method (especially the method as described in paragraph [0021]-[0025]) as described in Unexamined-Japanese-Patent No. 2004-174234, for example.

  The above configuration relates to the overhanging portion 50 in the topsheet 31, but the same configuration may be applied to the central portion 51 in the topsheet 31. Alternatively, the central portion 51 may be configured as shown in FIG. 5, and only the overhang portion 50 may be configured as shown in FIGS. 9 (a) and 9 (b).

  Also in the diaper 1 which has the overhang | projection site | part 50 which has the above structure, the effect similar to the diaper of embodiment mentioned above is show | played.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the overhanging portion 50 shown in FIG. 3 and the like, there is a space inside the ridge 43, and the ridge 43 has a hollow structure. May be a solid structure filled with fibers. The same applies to the convex portion 64 of the embodiment shown in FIGS. 9A and 9B. Instead of the convex portion 64 having a hollow structure, a solid structure in which the inside is filled with fibers is used. Also good.

  Moreover, although the overhang | projection site | part 50 in each said embodiment was formed by laminating | stacking two nonwoven fabrics, it replaces with this and comprises the overhang | projection part 50 using only the upper layer nonwoven fabric which has an uneven structure. Also good. In this case, both the skin contact surface and the non-skin contact surface in the overhanging portion 50 have an uneven structure.

  Further, in each of the above-described embodiments, the uneven structure is formed not only on the overhanging portion 50 but also on the skin contact surface side of the central portion 51 in the topsheet 31. However, the uneven portion structure is formed on the central portion 51. Instead, it may be in a flat state.

  Each of the above embodiments is an example in which the present invention is applied to a pants-type disposable diaper, but the present invention is similarly applied to other absorbent articles, such as unfolded disposable diapers and shorts-type sanitary napkins. Applicable.

1 Pants-type disposable diaper (absorbent article)
2A Ventral sheet member 2B Dorsal sheet member 3 Absorbent body 31 Top sheet 32 Back sheet 33 Absorber 34 Leak-proof cuff 34a Base end 34b Free end 341 End area 41 Projection 42 Projection 42 Projection 65 Concavity 50 Overhanging part 4 Side seal part 5 Waist opening part 6 Leg opening part A Abdominal side part B Back side part C Crotch part

Claims (6)

A pair of leak-proof cuffs extending in the longitudinal direction are disposed on both sides in the width direction, and an absorbent article in which a liquid-permeable surface sheet is disposed on the skin contact surface side of the absorber,
The leak-proof cuff is joined to the top sheet in a state where both end regions along the longitudinal direction are inwardly lying, and has a propensity to stand toward the wearer's body,
The surface sheet is bonded to the absorber in a region overlapping with the absorber, and has a protruding portion that protrudes in the width direction beyond both side edges of the absorber and is not bonded to the absorber. Have
The projecting portion has a concavo-convex structure composed of a plurality of convex portions projecting toward the wearer's body and concave portions located between the convex portions,
The said overhang | projection site | part is turned toward the wearer's body side, The absorbent article which is contact | abutting to the inner surface of this leak-proof cuff in the non-joining state so that the said leak-proof cuff may stand along.   The absorptive article according to claim 1 in which said convex part and said crevice extend along a longitudinal direction, and, thereby, said overhanging part has a grooved structure.   The leak-proof cuff is erected with the base end portion being a position between the back sheet and the absorbent body and a position of a side edge of the absorbent body or a position closer to the inner side in the width direction than the side edge. The absorbent article according to claim 1 or 2.   When the overhang width in the width direction of the overhang portion is E, the distance between the base end portion and the free end portion of the leak-proof cuff is D, and the thickness of the absorber is T, T <E < The absorbent article according to any one of claims 1 to 3, wherein a DT relationship is established.   The absorptive article according to any one of claims 1 to 4 in which said concavo-convex structure is formed in said projecting part over the whole longitudinal direction of said absorber.   The absorbent article as described in any one of Claims 1 thru | or 5 with which the non-skin contact surface side in the said overhang | projection site | part is flat.

Images