JP5577085B2 - Pants-type disposable diapers - Google Patents

Description

  The present invention relates to a pants-type disposable diaper.

  The present applicant has previously proposed a pants-type disposable diaper having an absorbent main body and an outer packaging material that is disposed and fixed on the outer side (see Patent Documents 1 to 3). In this diaper, an absorbent core, which is a member forming the absorbent main body, is connected to a central absorbent body at one side in the longitudinal direction of the central absorbent body, and a pair of sides provided on both sides of the central absorbent body. And an absorber. Of the central absorber and the side absorber, the side absorber is arranged at the crotch part of the diaper. The absorbent main body is configured such that the side absorbent body stands on the crotch part of the diaper. In addition, leak-proof cuffs are formed on both sides of the absorbent body. This diaper has the advantage that the crotch part does not bump when worn, the appearance of the diaper is clean, and the fit and leakage prevention at the crotch part are excellent.

Further, in Patent Document 4, the absorber in the crotch is provided with an auxiliary bent portion composed of a pair of thin portions, and a protruding portion that protrudes in the opposite direction on the outer side in the width direction. Describes a diaper that is easily deformed.

JP 2006-141761 A JP 2006-341061 A JP 2006-29482 A Japanese Patent Laid-Open No. 2008-12198

  For example, in the diaper of Patent Document 1, as shown in FIG. 8, the diaper described in the same document has a leak-proof cuff rising from the leg elastic member. Sex may be inhibited. When the side absorbent body does not stand up successfully, a part of the side absorbent body tends to block the leg opening, and it may be difficult to pass the leg through the leg opening when the diaper is worn.

  In the diapers of Patent Documents 2 and 3, the standing property in the width direction is good, but there is no description regarding the fit property at the buttocks. Further, in Patent Document 4, as shown in FIG. 10, it is said that the raised portion rises and an ideal ship shape is formed, but there is a concern about liquid leakage from the recessed portion existing adjacent to the raised portion. Furthermore, in the back body part, the rigidity of the absorbent body may be difficult to follow the wearer's body shape and movement when worn, particularly in the sitting position, and there is room for improvement.

  The objective of this invention is providing the underpants type disposable diaper which various performance further improved rather than the prior art mentioned above.

The present invention includes an absorbent main body having an absorbent core and an outer packaging material disposed and fixed on the outer side thereof, and leg elastic members are arranged in an extended state along a pair of leg opening edges in the outer packaging material, In a pants-type disposable diaper having a longitudinal direction extending from the side part to the back side part through the crotch part and a width direction perpendicular thereto,
The absorbent core includes a central absorbent body and a pair of side absorbent bodies that are disposed on both sides of the central absorbent body and extend in the longitudinal direction, and the central absorbent body and the pair of side absorbent bodies Each having a longitudinally extending separating portion therebetween,
The absorbent main body has a pair of leak-proof cuffs on both sides along the longitudinal direction of the diaper, the leak-proof cuff covers the back side of the side absorbent body in the absorbent main body, and the absorbent main body It extends from the side edge and stands up toward the surface side.
In plan view, the leg elastic member and the leak-proof cuff overlap, and both are in a non-joined state,
In the back side of the diaper, the absorbent core has a pair of notches that extend inward in the width direction from the respective side edges, and the notch and the separating part are a plan view of the diaper in a developed state. The pants-type disposable diaper which is arrange | positioned so that at least one part may overlap may be provided regarding the said width direction.

  The pants-type disposable diaper according to the present invention is compatible with both side leakage prevention and ease of mounting.

FIG. 1 is a perspective view showing an embodiment of a pants-type disposable diaper of the present invention. FIG. 2 is a plan view of the diaper shown in FIG. 1 as viewed from the top sheet side when the diaper shown in FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 (a) and 4 (b) are plan views showing the absorbent core, respectively. FIG. 5 is a plan view (corresponding to FIGS. 4A and 4B) showing another embodiment of the absorbent core. 6 is a cross-sectional view (corresponding to FIG. 3) showing another embodiment of the diaper shown in FIG. 7A and 7B are cross-sectional views (corresponding to FIG. 3) showing another embodiment of the diaper shown in FIG. FIG. 8 is a plan view showing the positional relationship between the absorbent core and the leg elastic member. FIG. 9 is a plan view showing another positional relationship between the absorbent core and the leg elastic member. FIG. 10 is a schematic view showing a liquid absorption mechanism in the diaper shown in FIG. Fig.11 (a) is sectional drawing (FIG. 3 equivalent figure) which shows another embodiment of the absorbent article of this invention, FIG.11 (b) is a top view of the absorptive core in Fig.11 (a). It is. FIG. 12 is a cross-sectional view (corresponding to FIG. 3) showing still another embodiment of the absorbent article of the present invention.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The perspective view of one Embodiment of the underpants type disposable diaper of this invention is shown by FIG. FIG. 2 is a plan view of the diaper shown in FIG. 1 as viewed from the top sheet side when the diaper shown in FIG. The diaper 10 shown in FIGS. 1 and 2 is a so-called pants-type diaper. The diaper 10 includes an absorbent main body 20 and an outer packaging material 30 located on the non-skin contact surface side of the absorbent main body 20. The diaper 10 is divided into an abdominal side A disposed on the wearer's abdomen, a back side B disposed on the back of the wearer, and a crotch C positioned therebetween. The ventral portion A, the dorsal portion B, and the crotch portion C are in a longitudinal direction (FIG. 2) in a diaper in an expanded and expanded state (a state in which the elastic member of each portion is expanded and expanded in a planar shape, as shown in FIG. 2). In the vertical direction) is divided into three regions so as to be divided into approximately three equal parts. Regarding the diaper, in this specification, the direction extending from the abdominal part A to the dorsal part B is referred to as the vertical direction, and the direction orthogonal thereto is referred to as the width direction. In the diaper 10 shown in FIGS. 1 and 2, the longitudinal direction is the longitudinal direction of the diaper 10.

  In addition, in this specification, the "non-skin contact surface side" is the side arranged on the opposite side to the wearer's skin side during wearing, among the front and back sides (surfaces) of each member such as the absorbent main body 20. (Surface). Moreover, although the word "skin contact surface side" may be used in the following description, this is the side arranged on the skin side of the wearer at the time of wearing among the front and back sides (surfaces) of each member ( Surface). Further, in the following description, the expressions “back surface side” and “front surface side” are also used, but these terms are synonymous with “non-skin contact surface side” and “skin contact surface side”. The “longitudinal direction” is a direction parallel to the long side of each member. In the following description, the phrase “width direction” may be used, which is a direction orthogonal to the longitudinal direction.

  The absorbent main body 20 has a vertically long rectangular shape, the longitudinal direction of which coincides with the longitudinal direction of the diaper and extends from the abdominal side A to the back side B by a known joining means such as a hot melt adhesive. The outer packaging material 30 is joined to the center portion in the width direction. Details of this joining will be described later. The outer packaging material 30 has both side edges of the portion located on the ventral side A and both side edges of the portion located on the back side B being mutually connected by known joining means such as heat seal, high frequency seal, ultrasonic seal, etc. It is joined. Accordingly, a pair of side seal portions S is formed on the diaper 10. Moreover, the waist opening part 11 and a pair of leg opening parts 12 and 12 are formed in the diaper 10 by the joining, and the outer packaging material 30 becomes a underpants type three-dimensional shape.

  As shown in FIG. 3, the outer packaging material 30 includes an inner layer sheet 31 and an outer layer sheet 32, and elastic members of respective parts fixed between these two sheets. The elastic member of each part will be described later. The inner layer sheet 31 and the outer layer sheet 32 have the same shape. The outer edge of the outer packaging material 30 forms the contour of the unfolded diaper 10. The inner layer sheet 31 and the outer layer sheet 32 are preferably composed of the same or different breathable sheets, for example, non-woven fabrics manufactured by various methods.

  A plurality of elastic waist members 33 extending in the width direction of the diaper 10 along the opening edge are arranged in an extended state on the waist opening edge of the outer packaging material 30. In addition, a plurality of leg elastic members 34 are provided in an extended state along the opening edge at the leg opening edge in the outer packaging material 30. As shown in FIG. 1, the leg elastic member 34 is not arranged in the crotch part C of the diaper 10 so as to cross the outer packaging material 30 in the width direction. Therefore, the outer packaging material 30 has a non-stretchable region in the central region in the width direction of the outer packaging material 30 in the crotch part C of the diaper 10. In the present embodiment, the leg elastic member 34 is not present in a portion where a later-described separation portion 24 is present, so that the portion is a non-stretchable region.

  Between the waist elastic member 33 and the leg elastic member 34, a plurality of waistline elastic members 35 extending in the width direction of the diaper 10 are arranged in an extended state. The waistline elastic member 35 is disposed so as not to intersect the absorbent main body 20.

  As shown in FIG. 3, the absorbent main body 20 joined and fixed to the outer packaging material 30 includes a top sheet 21, a back sheet 22, and an absorbent core 23 disposed between both sheets 21 and 22. Yes. The top sheet 21 is made of a liquid-permeable sheet and faces the wearer's skin when the diaper 10 is worn. The back sheet 22 is made of a liquid-impermeable or water-repellent sheet and faces the outer packaging material 30. Elastic members 23 ′ are arranged in an extended state on the left and right side edges of the absorbent core 23. The elastic member 23 ′ is disposed over almost the entire length of the absorbent core 23 and is wrapped by the top sheet 21. The elastic member 23 ′ is used for further raising a side absorber 23 b described later, but in this embodiment, the side absorber 23 b, the leg elastic member 34, and the leak-proof cuff 40 are not joined to each other. Since the side absorber 23b is sufficiently raised, the elastic member 23 ′ may not be arranged.

  As the top sheet 21 and the back sheet 22, those similar to those conventionally used in the technical field can be used without particular limitation. For example, as the top sheet 21, a liquid-permeable nonwoven fabric or a perforated film can be used. As the back sheet 22, a water-repellent nonwoven fabric having a high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used. When the back sheet 22 is liquid impermeable, the sheet 22 may have water vapor permeability. From the viewpoint of leakage prevention and breathability, the back sheet 22 is preferably a liquid-impermeable film made of a synthetic resin having water vapor permeability. The absorbent core 23 is composed of, for example, a mixture of liquid-absorbing fibers made of cellulosic fibers such as pulp and particles made of a hydrogel material such as a superabsorbent polymer, or the mixture is made of tissue paper, It is configured by being covered with a liquid-permeable sheet made of a nonwoven fabric or the like.

  FIG. 4A shows a plan view of the absorbent core 23 used in the absorbent main body 20. In the figure, the upper side corresponds to the ventral side A of the diaper 10, and the lower side corresponds to the back side B of the diaper 10. The absorptive core 23 has a substantially rectangular shape as a whole. Further, the absorbent core 23 has a symmetrical shape with respect to the longitudinal direction of the diaper 10. Furthermore, the absorptive core 23 has the center absorber 23a and a pair of side absorber 23b. A separation portion 24 exists between the central absorber 23a and the side absorber 23b. As shown in FIG. 2, the separation part 24 exists closer to the ventral side part A (hereinafter also referred to as “first half part”) than the center line L that bisects the longitudinal direction of the diaper 10. The separation part 24 is a part where the constituent material of the absorber is not present at all, or a part where a small amount of the constituent material is present, or is compressed by pressurization and thinner than other parts. It is a pressing part. It is preferable that the separation part 24 is a site | part from which the constituent material of an absorptive core does not exist at all from the viewpoint of the mounting | wearing property of the diaper 10, and the diffusibility of a liquid. In this case, the separation part 24 may have a predetermined width, or only the slit-like cut may be formed in the absorbent core 23 (that is, the width may be zero). By providing the separation part 24 between the central absorbent body 23a and the side absorbent body 23b, the side absorbent body 23b is likely to buckle along the separation part 24 when the diaper 10 is mounted. As a result, as shown in FIG. 3, the side absorbent body 23b rises up successfully together with a leak-proof cuff 40, which will be described later. It is advantageous from the standpoint of preventing side leakage of the liquid that the side absorbent body 23b stands up. In addition, when the wearer wears the diaper 10, the leg opening 12 is closed by the side absorbent body 23b. This is very advantageous in that it is effectively prevented and the leg can be easily inserted into the leg opening 12. This is particularly effective when the width at the crotch part C of the absorbent main body 20 is larger than the width at the crotch part of the outer packaging material 30.

In the embodiment shown in FIG. 4 (a), the side absorbent body 23b is connected to the central absorbent body 23a at one part in the longitudinal direction of the central absorbent body 23a, and the other part is opened. As shown in FIG. 2, it is more preferable that the longitudinal absorber is connected to the central absorbent body 23a in two longitudinal directions. More specifically, in the case of the one-part connection shown in FIG. 4A, the side absorbent body 23 b is connected to the central absorbent body 23 a at one part near the stomach side of the diaper 10. The side absorbent body 23b has an elongated shape extending in the longitudinal direction of the diaper 10, and the distal end portion thereof is a free end. The side absorbent body 23b exists in the crotch part C of the diaper 10, and the tip of the side absorbent body 23b is located at a position near the back side part B beyond the crotch part C of the diaper 10. Further, in the case of the two-way connection shown in FIG. 4B, the side absorbent body 23b is a two-sided portion of the diaper 10 that is relatively close to the stomach side and relatively close to the back side. It connects with the center absorber 23a, and the separation part 24 has a closed shape. As a result, from the viewpoint of workability of the absorbent core 23, the core 23 is less likely to bend on the conveyance, so that the core 23 can be molded in a stable state, and the liquid diffused by the separating portion 24 can be spread all around. excellent leak-proof property for efficiently absorbed.

  Further, as shown in FIG. 5, a form in which the separating portion 24 exists only near the ventral portion A from the center line L that bisects the absorbent core 23 in the longitudinal direction can be mentioned. 4 (a) and (b) and the separation part 24 shown in FIG. 5 are all located closer to the ventral part A than the center line L that bisects the absorbent core 23 in the longitudinal direction. As shown in FIG. 2, these absorbent cores 23 are arranged on the outer packaging body 30 so that the separation part 24 is located in the front half, so that the side absorbent body 23b stands up so as to wrap the urination part of the wearer. And since the crotch part C of a diaper fits a wearer's narrow crotch part, it is effective in prevention of the side leakage of urine. Further, when the separation portion 24 is closed as in the embodiment shown in FIG. 4B, the effect of preventing liquid leakage is high, and further, as in the embodiment shown in FIG. When it exists only in the front half, the side absorbent body 23b can stand up and form a pocket structure only around the urination part of the wearer, so that the discomfort in the buttocks in the sitting position, collapse of the pocket during operation, etc. There is also an advantageous effect that is difficult to occur. This advantageous effect becomes even more remarkable in the embodiment shown in FIG. 5 because the longitudinal front edge and the rear edge of the separating portion 24 are not opened at the side edges of the absorbent core 23. The separating portion 24 has a flat trapezoidal outline, the upper side and the lower side of the trapezoid coincide with the longitudinal direction of the diaper 10, the upper side is located inward in the width direction of the diaper, and the lower side is It is located outward in the width direction of the diaper. Moreover, unlike FIG.4 (a) and (b) demonstrated previously, in this embodiment, the crossing separation part 25 mentioned later is not formed in the center absorber 23a.

  In the embodiment shown in FIGS. 4A and 4B, the central absorbent body 23 a has a cross-cutting portion 25 extending in the diaper width direction at the crotch portion C of the diaper 10. The cross-cutting portion 25 may be provided in the central absorbent body 23a adjacent to the cut-off portion 24. Preferably, the width of the central absorbent body 23a is the narrowest at the position where the cross-cutting portion 25 is formed. Is good. The shape of the transverse cut-off part 25 is not limited, but a straight line with a constant width is preferable. The left and right end portions of the transverse separation portion 25 are connected to the separation portions 24 described above. The cross-cutting portion 25 is a portion where the constituent material of the absorber is not present at all, similarly to the cutting portion 24 described above, or a portion where a small amount of the constituent material is present, or It is a pressing portion that is consolidated by pressurization and is thinner than other portions. It is preferable that the crossing separation part 25 is a site | part from which the constituent material of the absorptive core 23 does not exist at all from a viewpoint of the mounting | wearing property of the diaper 10, and the diffusibility of a liquid. By providing the crossing separation part 25, the absorptive main body 20 becomes easy to buckle along the width direction of the diaper 10. FIG. Accordingly, the diaper 10 can be easily mounted by the cross-cutting portion 25 as well as the cutting-off portion 24 described above. Furthermore, by using the above-described separation portion 24 and the transverse separation portion 25 in combination, a substantially H-shaped separation portion is formed on the absorbent core 23 as a whole. By adopting this substantially H-shaped separating portion, there is an advantage that the diffusibility of the liquid excreted in the absorbent core 23 in the longitudinal direction and the width direction is further increased.

  The width | variety of the center absorber 23a is increasing gradually toward the back side part B of the diaper 10 from the position of the crossing separation part 25. FIG. At the back side B of the diaper 10, that is, at a position closer to the back side B than the transverse cut-off part 25, the central absorbent body 23 a has a wedge shape that tapers from the left and right side edges 26 toward the inside in the width direction. It has a pair of side edge notch portions 26a. In the plan view of the unfolded state of the diaper 10, the side edge notch part 26a and the above-described separation part 24 are arranged so that at least a part thereof overlaps in the width direction. In other words, in FIGS. 4A and 4B and FIG. 5, when the region from the outer edge in the width direction to the inner edge of the side edge notch portion 26a is virtually extended in the vertical direction, it is cut into that area. At least the separation part 24 exists. As a result, the uprightness of the side absorber 23b by the separating portion 24 is further enhanced. In particular, in the case of the shape in which the separation portion 24 is closed as shown in FIGS. 4B and 5, the line connecting the side edge notch portion 26 a and the separation portion 24 existing on the back side thereof Since the side absorbent body 23b easily stands along the side absorber 23b, twisting and twisting hardly occur when the side absorbent body 23b stands up, and the fit property and leakage prevention property in the vicinity of the wearer's urine portion are enhanced.

  In the plan view of the diaper 10 in the unfolded state, the side edge notch 26a is directed from the longitudinal back side B to the ventral side A as it goes from the outside in the width direction to the inside (in FIG. 4). , And a wedge shape facing upward). Thereby, even if the side edge notch portion 26a is not disposed adjacent to the side absorbent body 23b, the standing property of the side absorbent body 23b is enhanced. In addition, the absorbent core is easily bent along the shape of the body at the buttocks of the wearer, and when the wearer moves the buttocks in the sitting position, the portion after the side edge notch portion 26a of the absorbent core 23 is in motion. It becomes easy to follow. As a result, the feeling of wearing is excellent and it is useful for suppressing stool leakage during defecation.

  Further, the central absorbent body 23a has a wedge-shaped edge notch portion 27a that tapers from the end edge 27 toward the inside in the longitudinal direction at the position of the center portion in the width direction of the end edge 27 in the back side portion B of the diaper 10. ing. Since the central absorbent body 23a has such a shape in the back side portion B, the central absorbent body 23a is successfully deformed so as to fit the wearer's body when the diaper 10 is worn, and the absorbent core It is difficult to create a gap between the body 23 and the wearer's body.

  The absorbent core 23 having the above shape can be manufactured according to a method known in the art. For example, by using a stacking drum having a concave portion having a shape corresponding to the shape of the absorbent core 23 on the peripheral surface, and supplying and depositing a mixture of liquid absorbent fibers and particles of hydrogel material in the concave portion. Can be manufactured.

  Returning to FIG. 3 again, the entire area of the absorbent core 23 on the skin contact surface side is covered with the surface sheet 21. The surface sheet 21 extends from the left and right side edges of the absorbent core 23, and the extended portion 21 a is wound down toward the non-skin contact surface side so that the entire area of the side absorbent body 23 b on the non-skin contact surface side is covered. It is covered. Further, the extending portion 21a covers the left and right side portions on the non-skin contact surface side of the central absorbent body 23a beyond the separation portion 24. The above-described back sheet 22 is disposed on the non-skin contact surface side with respect to the extended portion 21 a of the top sheet 21, and is joined to the extended portion 21 a by a hot melt adhesive 28.

  As shown in FIG. 3, the absorptive main body 20 has a pair of leak-proof cuffs 40 on both sides along the longitudinal direction of the diaper. This leak-proof cuff 40 covers the entire area of the back surface side (that is, the non-skin contact surface side) of the side absorbent body 23b in the absorbent main body 23, and further beyond the separation portion 24 on the back surface side of the central absorbent body 23a. The left and right sides are also covered. Furthermore, the leak-proof cuff 40 extends from the side edge of the absorbent main body 23 and stands up toward the surface side (that is, the skin contact surface side). One or a plurality of elastic members 41 are arranged and fixed in an extended state on the free edge 40a of the standing leak-proof cuff 40.

  When the wearer performs activities such as walking while the side absorbent body 23b is standing, friction is generated between the back side of the side absorbent body 23b and the inner layer sheet 31 or clothes. In order to prevent the back sheet 22 from being damaged by this friction, the leak-proof cuff 40 needs to cover the back side of the absorbent main body 23. However, the leak-proof cuff 40 is not necessarily required to cover the entire area of the back surface side of the absorbent main body 23, and may cover at least the back surface side of the absorbent main body 23 excluding the position where the hot melt adhesive 28 is applied. That's fine.

  The leakproof cuff 40 will be described in further detail. The leakproof cuff 40 includes a rectangular leakproof cuff forming sheet 42. The leak-proof cuff forming sheet 42 is made of, for example, a water-repellent nonwoven fabric having high water pressure resistance. The leak-proof cuff forming sheet 42 is folded in half so that the folding position is the free edge 40a and the side edge 42a is a fixed part, thereby forming the leak-proof cuff 40. The side edge portion of the leak-proof cuff forming sheet 42 extends beyond the side absorbent body 23 b and the separation portion 24 on the non-skin contact surface side of the absorbent main body 20, and together with the top sheet 21 and the back sheet 22, a hot melt type The adhesive 28 is bonded and fixed on the non-skin contact surface side of the central absorbent body 23a. A position where the hot melt adhesive 28 is applied becomes a fixing portion of the leak-proof cuff 40. And the leak-proof cuff 40 is in a non-joined state with other members adjacent to the leak-proof cuff 40 from the fixed portion to the free edge 40a, and can move freely independently. ing. Here, the “other adjacent members” include, for example, the leg elastic member 34, the outer packaging material 30, the extended portion 21a of the topsheet 21, the side absorbent body 23b, and the like. The leak-proof cuff forming sheet 42 is not limited to a single sheet material, and may be configured by combining a plurality of sheet materials.

  Regarding the positional relationship between the leak-proof cuff 40 including the leak-proof cuff forming sheet 42 and the back sheet 22 described above, the left and right sides of the back sheet 22 are folded in two as shown in FIG. It is sandwiched between the leak-proof cuff forming sheets 42. Specifically, as shown in the figure, the back sheet 22 covers the back side of the side absorbent body 23b in addition to the back side of the central absorbent body 23a in the absorbent main body 20. The entire region of the left and right side portions excluding the central region in the width direction is sandwiched between the leakage-proof cuff forming sheets 42 folded in half. Thus, by sandwiching the back surface sheet 22 between each of the leak-proof cuff forming sheets 42 folded in half, the leak-proof cuff 40 has two leak-proof cuff forming sheets 42 on the back side of the side absorber 23b. In addition, a total of three sheets including a single back sheet 22 is provided. As a result, in the state where the side absorber 23b stands up, the strength of the leak-proof cuff 40 positioned outside the side absorber 23b is increased and is not easily broken, and liquid leakage is further less likely to occur. Further, the back sheet 22 is generally made of a synthetic resin film, and the film exhibits a sticky feeling against the skin. With the above-described sheet configuration, the back sheet 22 directly touches the wearer's skin. Since it becomes difficult to touch, the diaper 10 has a good cloth-like texture.

  In the embodiment shown in FIG. 3, the leak-proof cuff forming sheet 42 covers the entire width direction of the side absorbent body 23b on the lower side of the side absorbent body 23b, but instead, the width of the side absorbent body 23b. Only a part of the direction may be covered. For example, as shown in FIG. 6, when the side portion of the back sheet 22 is sandwiched between the leak-proof cuff forming sheets 42 folded in half, only a portion having a predetermined width near the side edge of the back sheet 22 is sandwiched. As a result, the leak-proof cuff forming sheet 42 covers only a part of the side absorbent body 23b in the width direction.

  Further, in the embodiment shown in FIG. 3, the two leak-proof cuff forming sheets 42 folded in half cover the entire width direction of the side absorber 23 b on the lower side of the side absorber 23 b. Instead, only one of the two leak-proof cuff forming sheets 42 may cover the entire width direction of the side absorbent body 23b on the lower side of the side absorbent body 23b. For example, in the embodiment shown in FIG. 7 (a), only two of the two leak-proof cuff forming sheets 42 that are folded in two are positioned below the back sheet 22 over the entire width direction of the side absorber 23b. Covering. The leak-proof cuff forming sheet 42 located on the upper side of the back sheet 22 is terminated near the side edge of the back sheet. On the other hand, in the embodiment shown in FIG. 7 (b), only the one located on the upper side of the back sheet 22 out of the two leak-proof cuff forming sheets 42 folded in half covers the entire width direction of the side absorber 23b. Covering. The leak-proof cuff forming sheet 42 located below the back sheet 22 terminates in the vicinity of the side edge of the back sheet. When the embodiment shown in FIG. 7A and the embodiment shown in FIG. 7B are compared, the back sheet 22 is more protected than the embodiment shown in FIG. 7B where the back sheet 22 is exposed to the outside. The embodiment shown in (a) is preferred. In addition, the leak-proof cuff formation sheet 42 located below the back sheet 22 in FIG. 7A and the leak-proof cuff formation sheet 42 positioned above the back sheet 22 in FIG. Similarly to the embodiment shown in FIG. 6, only a part of the side absorbent body 23 b in the width direction may be covered.

  As shown in FIG. 3, the absorbent main body 20 is joined to the outer packaging material 30 by a hot-melt adhesive 29 over the entire length at the position of the central absorbent body 23a. On the other hand, the side absorbent body 23b in the absorbent main body 20 is not joined to the outer packaging material 30 over the entire length thereof. Since the side absorbent body 23b is in a non-bonded state with the outer packaging material 30, the standing property of the side absorbent body 23b becomes very good in combination with the provision of the above-described separation portion 24. The good standing property of the side absorbent body 23b is that, as described above, the improvement of the side leakage prevention property of the liquid and the wearing of the diaper 10 (that is, the leg opening) even if the absorbent main body 20 is wide. This is advantageous in that the leg can be easily inserted into the portion 12. Further, when the portion of the side absorbent body 23b in the absorbent main body is joined to the outer packaging material 30, the center absorbent body 23a is liable to be generated. Is less likely to occur, and a reduction in leakage resistance is effectively prevented.

  The joining region when the absorbent main body 20 and the outer packaging material 30 are joined with the hot melt adhesive 29 is a range that does not exceed the non-stretchable region of the outer packaging material 30 described above in the width direction of the diaper 10. Yes. As a result, the side absorbent body 23b is less affected by the expansion and contraction of the leg elastic member 34 disposed on the outer packaging material 30, and the side absorbent body 23b stands up more successfully.

  Regarding the arrangement of the leg elastic members 34, as shown in FIG. 8, the outer edge 23 b ′ of the side absorbent body 23 b and the leg elastic members 34 intersect in a plan view of the diaper 10 in a developed state. By disposing the leg elastic member 34 in this way, the side absorbent body 23b can easily stand up when the diaper 10 is worn, and the fit of the diaper 10 at the crotch portion C is improved. While the leg elastic member 34 intersects with the outer edge 23b of the side absorbent body 23b, the end portion of the crotch portion C does not reach the separation portion 24 of the absorbent core 23. By adopting such a configuration, according to the present embodiment, the separation portion 24 is formed as compared with the case where the leg elastic member 34 exhibiting elasticity is present in the separation portion 24 in plan view. It is preferable because it can be reliably formed, and thereby the side absorber 23b can be erected successfully.

  FIG. 9 shows another positional relationship between the absorbent core 23 and the leg elastic member 34. In the embodiment shown in the figure, the end portion of the leg elastic member 34 at the crotch portion C reaches the separation portion 24. However, the portion of the leg elastic member 34 that overlaps with the separation portion 24 and the portion that is located inward in the width direction with respect to the separation portion 24 (the portion indicated by symbol D in FIG. 9) do not appear to be stretchable. Has been made. For example, when the leg elastic member 34 is sandwiched between the inner layer sheet 31 and the outer layer sheet 32, both the leg elastic members 34 are arranged in such a manner that the leg elastic member 34 does not expand and contract in the portion indicated by the symbol D. It is fixed between the sheets 31 and 32. Specifically, the leg elastic member 34 may be prevented from expanding or contracting by bonding using an adhesive or the like, or the leg elastic member 34 may be finely divided to prevent the leg elastic member 34 from expanding or contracting.

  As apparent from FIG. 8 and FIG. 3 described above, when the diaper 10 in the unfolded state is viewed in plan, the leg elastic member 34 and the leak-proof cuff 40 overlap each other in the crotch part C of the diaper 10. In addition, the leg elastic member 34 and the leak-proof cuff 40 are not joined to each other. As a result, the side absorber 23b and the leg elastic member 34 can move independently of each other. In the present embodiment, the side absorbers 23b are also arranged so as to overlap with each other in a plan view and in a non-joined state. As a result, in addition to the effects described above, the leak-proof cuff 40 can also move independently. Therefore, these parts are not easily affected by the wearer's movement, and each can independently exhibit leakage prevention. Specifically, as shown in FIG. 10, when the liquid L excreted on the skin contact surface side of the diaper 10 diffuses in the lateral direction of the diaper 10, it is first absorbed by the side absorbent body 23b. Even if the side absorbent body 23b cannot absorb all of the liquid L and the liquid L gets over the side absorbent body 23b, the liquid L is introduced between the side absorbent body 23b and the leak-proof cuff 40. be able to. Since the extension part 21a of the surface sheet 21 which is a liquid-permeable material exists on the back side of the side absorbent body 23b, the side absorbent body 23b can absorb and absorb liquid from the back side. It has become. Therefore, the liquid L that has entered between the side absorber 23b and the leak-proof cuff 40 is absorbed by the side absorber 23b from the back side of the side absorber 23b. Even if the liquid L crosses the leak-proof cuff 40 and leaks laterally, the liquid is temporarily held in the pocket portion P formed by the leak-proof cuff 40 and the outer packaging material 30 located on the back side thereof. As a result, further liquid leakage is prevented. In this way, according to the diaper of this embodiment, side leakage of the liquid is effectively prevented. Moreover, the standing side absorber 23b makes it easy to insert the leg into the leg opening 12 even if the absorbent core 23 is wide.

  From the viewpoint of further ensuring the above-described side leakage prevention effect, when the width of the side absorber 23b is W and the height of the leak-proof cuff 40 protruding from the upper surface of the side absorber 23b is H, both It is preferable to set the ratio of the dimensions of W: H = 1: 1 to 1: 0.5. In this case, the width of the side absorbent body 23b itself depends on the specific use of the diaper 10, but in the case of an adult diaper, W in the widest part of the side absorbent body 23 should be set to 10 to 100 mm. Is preferable, and it is more preferable to set to 20 to 80 mm.

  11 and 12 show another embodiment of the present invention. In these embodiments, only the portions different from the above-described embodiments will be described, and the descriptions of the above-described embodiments are applied as appropriate to the other portions.

  In the diaper of the embodiment shown in FIGS. 11A and 11B, the absorbent core 23 has a two-tiered structure. Specifically, the absorbent core 23 includes an upper absorbent core 231 located on the top sheet 21 side and a lower absorbent core 232 located on the back sheet 23 side. As shown in FIG. 11B, the upper absorbent core 231 and the lower absorbent core 232 are both rectangular. The length of the upper absorbent core 231 in the longitudinal direction is slightly smaller than the length of the lower absorbent core 232 in the longitudinal direction. The length in the width direction is larger in the lower absorbent core 232 than in the upper absorbent core 231. The upper absorbent core 231 is placed in the center region in the width direction of the lower absorbent core 232.

  The structure of the lower layer absorbent core 232 is the same as the absorbent core 23 in the embodiments described so far. In particular, it is the same as the absorbent core 23 of the embodiment shown in FIG. Specifically, the lower layer absorbent core 232 includes a central absorbent body 232a and a pair of side absorbent bodies 232b. A separation portion 242 exists between the central absorber 232a and the side absorber 232b. The cut-off portion 242 exists only closer to the ventral side than the center line L that bisects the absorbent core 23 in the longitudinal direction. The separation part 24 has a trapezoidal outline, and the front end edge and the rear end edge in the longitudinal direction of the separation part 24 are not opened at the side edge 262 of the lower layer absorbent core 232. The lower layer absorbent core 232 has a pair of wedge-shaped side edge notches 262a that taper from the left and right side edges 262 toward the inside in the width direction. The side edge notch portion 262a exists closer to the back side than the center line L that bisects the absorbent core 23 in the longitudinal direction. The side edge notch part 262a and the separation part 242 are arranged so that at least a part thereof overlaps in the width direction.

  The upper absorbent core 231 has a substantially rectangular shape. The upper absorbent core 231 is disposed between the pair of separating portions 242 in the lower absorbent core 232. In the plan view of the absorbent core 23, the upper absorbent core 231 does not overlap any of the pair of separating portions 242. When viewed from the entirety of the absorbent core 23, the core 23 has a thickness in the central region in the width direction that is greater than the thickness of the side region.

  The embodiment shown in FIG. 12 is obtained by inverting the arrangement relationship between the upper absorbent core 231 and the lower absorbent core 232 in the embodiment shown in FIG. That is, the upper absorbent core 231 in this embodiment corresponds to the lower absorbent core 232 in the embodiment shown in FIG. 11, and the lower absorbent core 232 in this embodiment is the upper absorbent in the embodiment shown in FIG. This corresponds to the core 231. Otherwise, this embodiment is the same as the embodiment shown in FIG. In the present embodiment, the lower absorbent core 232 is disposed so as not to overlap any of the pair of separating portions 241 formed on the upper absorbent core 231 in a plan view. Has been.

  According to the embodiment shown in FIG.11 and FIG.12, the thickness of the width direction center area in the absorptive core 23 increases, the fitting property of the diaper to a wearer's crotch part improves, and leak-proof property becomes favorable. . In addition to this, since the basis weight of the absorbent core 23 changes greatly with the separation parts 241 and 242 as a boundary, the standing property of the side absorbent bodies 231b and 232b from the separation parts 241 and 242 becomes even better. The side leakage prevention performance of excrement is further enhanced. From the latter viewpoint, the embodiment shown in FIG. 11, which is an embodiment in which the narrow absorbent core is located on the upper layer side, is more preferable than the embodiment shown in FIG.

  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 above-described embodiment, the leg elastic member 34 is not arranged so as to cross in the width direction of the outer packaging material 30 in the crotch part C of the outer packaging material 30. As long as the member 34 is arranged in such a manner as not to exhibit its stretchability, the leg elastic member 34 may be arranged so as to cross in the width direction of the crotch part C in the outer packaging material 30.

DESCRIPTION OF SYMBOLS 10 Underpants type disposable diaper 20 Absorbent main body 23 Absorbent core 23a Central absorber 23b Side absorber 24 Cut off part 30 Outer packaging material 34 Leg elastic member 40 Leak-proof cuff

Claims (4)

An absorbent main body having an absorbent core and an outer wrapping material arranged and fixed on the outer side thereof, and leg elastic members are arranged in an extended state along a pair of leg opening edges in the outer wrapping material. In a pants-type disposable diaper having a longitudinal direction across the back side part and a width direction perpendicular to the longitudinal direction,
The absorbent core includes a central absorbent body and a pair of side absorbent bodies that are disposed on both sides of the central absorbent body and extend in the longitudinal direction, and the side absorbent body exists in the crotch part of the diaper. And having a separation portion extending in the longitudinal direction between the central absorbent body and the pair of side absorbent bodies,
The central absorbent body has a transverse separation part extending in the width direction at the crotch part of the diaper,
The absorbent main body has a pair of leak-proof cuffs on both sides along the longitudinal direction of the diaper, the leak-proof cuff covers the back side of the side absorbent body in the absorbent main body, and the absorbent main body It extends from the side edge and stands up toward the surface side.
In plan view, the leg elastic member and the leak-proof cuff overlap, and both are in a non-joined state,
In the back side of the diaper, the absorbent core has a pair of notches that extend inward in the width direction from the respective side edges, and the notch and the separating part are a plan view of the diaper in a developed state. A pants-type disposable diaper arranged so that at least a part thereof overlaps in the width direction.   In plan view, the leg elastic member extends from the edge of the leg opening toward the separation portion, and the leg elastic member does not exhibit elasticity at a position where the separation portion exists. The pants-type disposable diaper according to claim 1.   3. The pants-type disposable diaper according to claim 1, wherein the notch portion extends in a direction from the back side portion in the vertical direction toward the abdominal side portion when the notch portion goes from the outside in the width direction to the inside. The pants-type disposable diaper according to any one of claims 1 to 3, wherein the separating portion is located only on the ventral side of a center line that bisects the longitudinal direction.

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