Patent Application
20240000629
The present invention relates to an underpants-type disposable wearing article having a function of preventing dorsal leakage.
An underpants-type disposable wearing article such as an underpants-type disposable diaper and an underpants-type sanitary article has elasticity along the width direction in a lower torso region thereof. Therefore, a gap is hardly formed between the wearer's back and the article. That is, excrement such as urine is hardly leaked from a dorsal side of the article (so-called dorsal leakage).
For example, a general underpants-type disposable diaper is provided with an outer member forming at least a lower torso portion of a front body part and a lower torso portion of a back body part, and an inner member including an absorber and being attached to the outer member so as to extend from the front body part to the back body part, and in the underpants-type disposable wearing article, both side edge portions of the outer member in the front body part and both side edge portions of the outer member in the back body part are bonded to each other, respectively so as to form side seal portions, thereby forming a waist opening and a pair of right and left leg opening portions. In the outer member, elastic members are provided in a lower torso region determined as a range in the front-back direction including the side seal portions (a range extending in the front-back direction from the waist opening to upper ends of the leg opening portions), thus, elasticity along the width direction is imparted to the lower torso region. As is known, not only an elongated elastic member such as a rubber thread but also an elastic film can be used as an elastic member (See, Patent Literatures 1 to 2, for example).
Due to such a high level of prevention of the dorsal leakage, there are users who are willing to use underpants-type disposable wearing articles while asleep for long time at night or the like. Additionally, in such a usage manner, it is still naturally more preferable that each of the underpants-type disposable wearing articles is provided with a dorsal side barrier. Therefore, it has been conventionally proposed that the dorsal side barrier is provided also in the underpants-type disposable wearing article (See, Patent Literature 1, for example).
However, there are cases when underpants-type disposable wearing articles provided with conventional dorsal side barriers are used while the dorsal side barriers thereof are flattened. Precisely, in producing such an underpants-type disposable wearing article, the dorsal side barrier is attached while a whole of it is flatly laid down. In addition, the dorsal side barrier is pressurized in a thickness direction in production. Not only that, even after production, the dorsal side barrier is pressurized in the thickness direction until a product of the underpants-type disposable wearing article is used. That is, even when the product is used, a standup section of the dorsal side barrier is remained to be attached weakly to a surface facing the standup section while the dorsal side barrier is laid down. Thus, if a user does not notice such a situation, the user would have to use the wearing article having an insufficient function of preventing leakage. It is therefore desired that the dorsal side barrier is made to stand up once when the underpants-type disposable wearing article is used.
Further, an underpants-type disposable wearing article may be used together with a pad-type absorbent article, which is to be laid on the internal surface of the article. In such case, if, by mistake, the pad-type absorbent article is laid on the dorsal side barrier, which is flatly laid down, there is a concern that the function of the dorsal side barrier is lost.
Therefore, a main object of the present invention is to provide an underpants-type disposable wearing article in which a dorsal side barrier can stand up unintentionally when the article is used.
An underpants-type disposable wearing article solving the above-mentioned problem is as follows.
<First Aspect>
An underpants-type disposable wearing article including
(Effect)
The dorsal side barrier of the present underpants-type disposable wearing article has a characteristic folding back structure and a characteristic arrangement of the elongated barrier elastic member. Thus, in the natural length state, in the main portion of the barrier sheet, each of both the side portions has a folding back structure extending from the first portion to the second portion and a folding back structure extending from the second portion to the third portion, but the intermediate portion disposed between both the side portions is gradually unfolded to a front side with increasing proximity to a center side in the width direction so as to spread partway or completely to the front side at a center portion in the width direction (the first status).
The reason of this may not be clear, but it is possible to consider as follows: in the natural length state, the intermediate portion of the main portion is elastically contracted together with the barrier elastic member; here, the intermediate portion provided with the barrier elastic member is an unfixed free portion, and the barrier elastic member is provided only in a position separated from a back edge of the third portion, thus, the third portion is inclined freely to the center side in the width direction; incidentally, based on an elastic contraction force of the barrier elastic member, a force is applied to the intermediate portion of the main portion; a component of this force, in a direction along which the intermediate portion of the main portion is folded back in a similar way to both the side portions, becomes smaller due to the third portion inclined freely to the center side in the width direction; in this way, the first status is generated. Additionally, since contraction pleats extending in a front-back direction are formed all over the intermediate portion of the main portion, a stiffness of the main portion becomes higher (which makes it difficult for the main portion to be folded and to be bent in the front-back direction). It is considered that this high stiffness also affects the intermediate portion of the main portion to be unfolded so as to spread.
On the other hand, for wearing the article, as the main portion of the barrier sheet is made to be stretched in the width direction together with the barrier elastic member, in each of both the side portions of the main portion, the folding back structure continued from the first portion to the second portion is maintained and the folding back structure continued from the second portion to the third portion is maintained to a certain extent. However, in the intermediate portion of the main portion, a portion (hereinafter, also referred to as a pivot portion), which is located to be closer to a front end edge of the main portion than an imaginary line extending in the width direction so as to pass along a boundary (folding back position) between the first portion and the second portion, pivots backward around the imaginary line (the second status).
The reason of this may not be clear either, but it is possible to consider as follows: for wearing the article, the barrier elastic member is stretched so as to be closely analogous to a straight line along the width direction; based on the elastic contraction force of the barrier elastic member, the force is applied to the intermediate portion of the main portion; the component of this force, in the direction along which the intermediate portion of the main portion is folded back in the similar way to both the side portions, becomes larger due to the barrier elastic member stretched so as to be closely analogous to the straight line along the width direction; on the other hand, a folding force hardly applies to the third portion since the third portion is unfixed all over the width direction; in this way, the second status is generated. Incidentally, the degree of the pivoting can be adjusted properly by the arrangement of the barrier elastic member and the like. Depending on the degree of pivoting, the third portion can pivot so as to stand up slightly from the natural length state, the third portion can pivot so as to fall over backward (toward a waist opening) which is opposite to the natural length state, or the like.
As is known from the change in the first status and in the second status discussed above, in a worn state where the intermediate portion of the main portion is contracted to a certain degree, a pocket open to a crotch portion is formed between the intermediate portion of the main portion and the top surface of the back body part, because the intermediate portion of the main portion is unfixed to the top surface of the back body part, while the base portion located at the back side of the intermediate portion and both the side portions located on both the sides of the intermediate portion in the main portion are fixed to the top surface of the back body part directly or indirectly. As a result, when excrement reaches the pocket, the movement of the excrement toward the back side and the movements of the excrement toward both the sides can be prevented by the pocket.
As stated above, in the present underpants-type disposable wearing article, the dorsal side barrier changes as in the above mentioned first status, as in the second status, and as in the worn state. Thus, when the article is used, the dorsal side barrier can stand up automatically, so that a case where the article is used while the dorsal side barrier is flattened and a case where by mistake, the pad-type absorbent article is laid on the dorsal side barrier, which is flatly laid down, is less likely to occur.
<Second Aspect>
The underpants-type disposable wearing article according to the first aspect,
(Effect)
The dimensions of each portion of the elongated barrier sheet may be determined appropriately. However, these dimensions are preferably within the ranges of the present aspect, because under a situation where the third portion is stretched at a stretch rate being 0.4 times or more the stretch rate at the maximum stretch, the above mentioned pivot portion may pivot about 90 degrees or more with respect to the top surface of the back body part, then, reaching a situation where the third portion is stretched at a stretch rate being 0.6 times or more the stretch rate at the maximum stretch, the pivot portion may fall down on the back side (the waist opening side).
<Third Aspect>
The underpants-type disposable wearing article according to the first or second aspect,
(Effect)
As in the present aspect, in addition to the elongated barrier elastic member, which is provided to extend through the third portions, the elongated shaping elastic member, which is provided to extend through at least one of the first portion, the second portion and the base portion, is preferably provided, because a shape of the dorsal side barrier may be arranged and in addition to this, it becomes easier for the intermediate portion of the main portion to be unfolded so as to spread in the natural length state.
<Fourth Aspect>
The underpants-type disposable wearing article according to any one of the first to third aspects,
(Effect)
In many cases, an underpants-type disposable wearing article including the absorber has a lower torso stretchable region as in the present aspect. Due to the lower torso stretchable region, it is possible to press the back end of the absorber and a vicinity thereof firmly against skin of a wearer. Further, it is general that a portion overlapping with the absorber in the outer member is free of the stretchable region. The present aspect is characterized in that such a lower torso stretchable region is utilized. Precisely, it is preferable that the base portion of the barrier sheet is fixed to the portion, which is adjacent to the absorber at the back end on the waist opening side thereof in the lower torso stretchable region, to be stretchable together with the lower torso stretchable region, because the shape of the dorsal side barrier may be arranged, and in addition to this, it may become easier for the intermediate portion of the main portion to be unfolded so as to spread in the natural length state.
<Fifth Aspect>
The disposable wearing article according to any one of the first to fourth aspects,
(Effect)
In a case of the present aspect, a user can easily recognize automatic deformation of the above mentioned dorsal side barrier (change from the first status to the second status). Therefore, for example, when the present underpants-type disposable wearing article is used together with a pad-type absorbent article, which is to be laid on the internal surface of the article, it becomes easier for the user to recognize an appropriate position for laying the pad-type absorbent article thereon.
As will be appreciated from the foregoing, the present invention provides advantages such as an ability of a dorsal side barrier to stand up unintentionally when the present underpants-type disposable article is used.
Hereinafter, a detailed description will be given of an example of an underpants-type disposable diaper, referring to accompanying drawings. Incidentally, each of dotted pattern regions in the drawings indicates an adhesive as bonding means that bonds respective components located on the top side and an underside thereof, and is formed by solid, bead, curtain, summit, or spiral coating of a hot melt adhesive, or pattern coating (transfer of the hot melt adhesive in a letterpress method), or application of the hot melt adhesive to an outer peripheral surface of an elastic member such as comb gun or sure wrap application instead of or together with the above methods in a fixed part of the elastic member. Examples of the hot melt adhesive include EVA-based, pressure sensitive adhesion rubber-based (elastomer-based), polyolefin-based, and polyester/polyamide-based adhesives, and can be used without any particular limitation. As bonding means that bonds respective components, it is possible to use means by material welding such as heat sealing or ultrasonic sealing.
(Structure Example of Inner Member)
As illustrated in
As the top sheet 11 that covers the top side (skin contact surface side) of the absorber 13, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, etc. is preferably used. As a material fiber constituting the nonwoven fabric, it is possible to adopt a regenerated fiber such as rayon and cupra or a natural fiber such as cotton in addition to a polyolefin-based synthetic fiber such as polyethylene or polypropylene, a polyester-based synthetic fiber, a polyamide-based synthetic fiber, etc., and it is possible to use a nonwoven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, a meltblown method, a needle punch method, etc. In these processing methods, the spun lace method is excellent in terms of flexibility and drapability, and the thermal bond method is excellent in terms of bulkiness and softness. When a large number of through holes are formed on the top sheet 11, urine and the like are quickly absorbed. In the illustrated embodiment, the top sheet 11 is wound around side edge portions of the absorber 13 and extends to an underside of the absorber 13.
As the liquid impervious sheet 12 covering the underside (non-skin contact surface side) of the absorber 13, a liquid impervious plastic sheet such as polyethylene or polypropylene may be used. However, in recent years, a sheet having a moisture penetration property may be preferably used from a viewpoint of preventing stuffiness. As this liquid impervious and moisture permeable sheet, for example, a microporous sheet may be favorably used which is obtained by melt-kneading an inorganic filler such as calcium carbonate in a polyolefin resin such as polyethylene or polypropylene, molding the melt-kneaded mixture into a sheet, and then stretching the sheet in one or two axial directions. In the illustrated embodiment, the liquid impervious sheet 12 is folded back to the underside together with the top sheet 11 at both sides of the absorber 13 in the width direction WD, but is not limited thereto and other known structures may be employed.
As the absorber 13, it is possible to use a known one, which is based on, for example, a pulp fiber stack, an assembly of filaments of cellulose acetate, etc., or a nonwoven fabric and which has superabsorbent polymer mixed therewith or fixed thereto, or the like as necessary. The entire shape of the absorber 13 is formed into a substantially hourglass shape having a narrower portion narrower than both front and back sides at a crotch portion. Alternatively, it may have an appropriate shape such as a rectangular shape. As long as the absorber 13 is provided in a range including a crotch portion of the inner member 10, the absorber 13 may be provided only in a part of the inner member 10. However, in a normal case, the absorber 13 is desirably provided all over a region of the inner member 10 exclusive of the front and back end portions thereof.
To hold the shape and the polymer particles and for other purposes, the absorber 13 can be wrapped in a wrapping sheet 14 having a liquid pervious and liquid retaining property such as crepe paper as necessary. The wrapping sheet 14 may be tissue paper, in particular, crepe paper, nonwoven fabric, polyethylene-laminated nonwoven fabric, perforated sheet, or the like, provided that sheets through which the super absorbent polymer particles will not escape are preferred. When nonwoven fabric is used in place of crepe paper, hydrophilic SMS (SMS, SSMMS, or the like) nonwoven fabric is particularly preferred, which may be made of polypropylene, polyethylene/polypropylene composite material, or the like. The basis weight of the wrapping sheet 14 is preferably 5 to 40 g/m2, particularly 10 to 30 g/m2.
A wrapping mode with the wrapping sheet 14 may be determined appropriately. However, in view of ease of manufacturing and in view of limiting escape of the super absorbent polymer particles from front and back end edges of the wrapping sheet 14, the following mode is preferable. Precisely, the wrapping sheet 14 winds around the absorber 13 in a tubular shape so as to surround a top surface, an underside surface, and both side surfaces thereof, while a front end edge portion and a back end edge portion of the wrapping sheet 14 are made to protrude forward and backward from the absorber 13, respectively. Overwrapped portions of the wrapping sheet 14 wound around the absorber 13 and overwrapped portions of the wrapping sheet 14 protruded from the absorber 13, respectively, are bonded to each other, by bonding means such as a hot melt adhesive or material welding.
Standup gather parts 90 are provided on both sides of the inner member 10 in the width direction WD. Each of the standup gather parts 90 includes a standup portion 94 standing up from a side portion of the inner member 10. This standup portion 94 is brought into contact with a range from an inguinal region to a gluteal region through a round-leg portion of a wearer for preventing side leakage. In more detail, as shown in
As the gather elastic member 96, it is possible to use a normally used material such as polystyrene-based rubber, polyolefin-based rubber, polyurethane-based rubber, polyester-based rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene copolymer, silicone, polyester, etc. In addition, to make it difficult to see from the outside, it is preferable that a fineness is set to 925 dtex or less, a tension is set to 150 to 350%, and an interval is set to 7.0 mm or less. Incidentally, as the gather elastic member 96, it is possible to use a tape-like member having a certain width in addition to a thread-like member as in the illustrated embodiment.
As a material fiber constituting the gather sheet described above, similarly to the top sheet 11, it is possible to adopt a regenerated fiber such as rayon or cupra or a natural fiber such as cotton in addition to a polyolefin-based synthetic fiber such as polyethylene or polypropylene, a polyester-based synthetic fiber, a polyamide-based synthetic fiber, etc., and it is possible to use a nonwoven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a meltblown method, a needle punch method, etc. However, in particular, in order to prevent stuffiness, it is preferable to use a nonwoven fabric that suppresses a basis weight and has excellent air permeability. Further, with regard to the gather sheet 95, to prevent passage of urine, etc., prevent a rash, and enhance a feel to a skin (dry feeling), it is preferable to use a water repellent nonwoven fabric coated with a silicone-based, paraffin metal-based, or alkylchromic chloride-based water repellent agent, etc.
(Structure Example of Outer Member)
As shown also in
In the outer member 20 of the illustrated embodiment, as the elastic members, in a spread shape shown in
The waist elastic member 24 is an elongated elastic member such as a plurality of rubber threads arranged at intervals in the longitudinal direction at a vicinity of a waist opening edge in a longitudinal direction range of the side seal portions 21 where the front body part F and the back body part B are bonded, and the waist elastic member 24 applies a stretching force to tighten a waist circumference of the wearer's body such that the diaper is put on the body. For the waist elastic member 24 in the illustrated example, thread rubbers are used, but for example, a tape-like elastic member may be used. Further, the waist elastic member 24 in the illustrated embodiment is sandwiched between the nonwoven fabrics of the folded portion 20C of the back sheet 20B in the waist portion, but it may be sandwiched between the pressing sheet 20A and the back sheet 20B.
The under-waist elastic members 25 are elongated elastic members such as rubber threads arranged at intervals in the longitudinal direction substantially in a range from an upper portion to a lower portion within the side seal portions 21, and the under-waist elastic members 25 apply stretching forces in the width direction WD to a lower torso portion of each of the front body part F and the back body part B such that the diaper is fit to the wearer's body. Incidentally, a boundary between the waist elastic member 24 and the under-waist elastic members 25 may not be necessarily clear. For example, among elastic members arranged along the width direction WD at intervals in the longitudinal direction in each of the front body part F and the back body part B, several number, although the number cannot be specified, of elastic members arranged in an upper portion side function as the waist elastic member, whilst remained elastic members function as the under-waist elastic members.
In the back body part B, a dorsal side curved elastic member 26 provided so as to separate from the under-waist elastic members 25 is an elongated elastic member such as a rubber thread, and is disposed along a predetermined curve. Although one dorsal side curved elastic member 26 may be provided, it is preferable that a plurality of dorsal side curved elastic members 26 is provided. In the illustrated example, four dorsal side curved elastic members 26 such as rubber threads are provided at each side of the outer member 20. These dorsal side curved elastic members 26 do not cross each other but are disposed at intervals therebetween. As for the arrangement of the dorsal side curved elastic members 26, instead of a group of about two or three elastic members arranged as a substantially bundle with being closely spaced, three or more, preferably four or more elastic members are arranged at intervals of about 3 to 20 mm, preferably about 6 to 16 mm so as to form a predetermined stretchable zone.
In the front body part F of the outer member 20, a ventral side curved elastic member 27 provided so as to separate from the under-waist elastic members 25 is an elongated elastic member such as a rubber thread, and is disposed along a predetermined curve. Although one ventral side curved elastic member 27 may be provided, it is preferable that a plurality of ventral side curved elastic members 27 is provided. In the illustrated example, four ventral side curved elastic members 27 such as rubber threads are provided at each side of the outer member 20. These ventral side curved elastic members 27 do not cross each other but are disposed at intervals therebetween. Also as for the arrangement of the ventral side curved elastic members 27, instead of a group of about two or three elastic members arranged as a substantially bundle with being closely spaced, more than three, preferably more than four elastic members are arranged at intervals of about 3 to 20 mm, preferably about 6 to 16 mm so as to form a predetermined stretchable zone.
Incidentally, as shown in
As is known from this example, among areas where the elastic members 24 to 27 are arranged, the contractible area becomes a stretchable region, while the non-contractible area becomes a non-stretchable region. The stretchable region may be provided at only a portion located to be closer to the waist opening than the back end portion of the absorber 13 in the back body part B. However, as in the illustrated example or as in other known examples, each stretchable region may be located in each part.
The outer member 20 described above can be manufactured using techniques disclosed in JP H04-028363 A and JP H11-332913 A, for example. In addition, the curved elastic members 26, 27 can be preferably cut and made discontinuous on the inner member 10 by cutting methods disclosed in JP 2002-035029 A, JP 2002-178428 A and JP 2002-273808 A.
Unlike the illustrated example, the curved elastic members 26, 27 may be provided only in either one of the front body part F and the back body part B. Further, when the curved elastic members 26, 27 are provided in both the front body part F and the back body part B, a mode in which a part or a whole of group of the curved elastic members 27 provided in the front body part F and a part or a whole of group of the curved elastic members 26 provided in the back body part B are crossed each other (not shown) may be adopted. However, as the illustrated example, a mode is preferable in which the group of the curved elastic members 27 provided in the front body part F and the group of the curved elastic members 26 provided in the back body part B are separated from each other, without crossing each other, in a middle part of the outer member 20 in the front-back direction LD, and particularly preferable at a position which is slightly closer to the front body part F than to the center of the middle part.
Each of the curved elastic members 26, 27 needs not be entirely curved, and may have a partially linear portion.
Although the stretch rate at the time of fixing the elastic members 24 to 27 can be appropriately determined, for normal adult use, about 160 to 320% for the waist elastic member 24, about 160 to 320% for the under-waist elastic member 25, and about 230 to 320% for the curved elastic members 26, 27.
(Cover Sheet)
As shown also in
As the illustrated embodiment, when the cover sheets 50 and 60 are attached as separate bodies, although there is an advantage that the degree of freedom of material selection increases, there are a disadvantage such as an increase in materials and manufacturing processes. Therefore, it is also possible to form portions equivalent to the above described cover sheets 50 and 60 by extending the folded portion 20C, which is formed by folding the outer member 20 toward the internal surface of the diaper, to a portion overlapping with the inner member 10.
(Dorsal Side Barrier)
As shown in
The dorsal side barrier 70 includes mainly a barrier sheet 71 having a width wider than a dimension in the width direction of the first blocking position B1 (an interval in the width direction between the second blocking positions B2) and extending from a front side of the first blocking position B1 to a back side thereof, and an elongated barrier elastic member to be discussed later. As the barrier sheet 71, as the illustrated example, a dedicated sheet is provided. Alternatively, the barrier sheet 71 may be formed by extending the cover sheet 60 of the back body part B toward the crotch portion. The material of the barrier sheet 71 is not particularly limited. However, it is desirable that a similar material as that of the gather sheet 95 is used. Nonetheless, a similar material as that of the pressing sheet 20A, back sheet 20B, cover sheet 50 or cover sheet 60 may be used.
The barrier sheet 71 includes a base portion 72 adjacent to the first blocking position B1 on the back side thereof, and a main portion 73 adjacent to the first blocking position B1 on the front side thereof. The base portion 72 is a portion fixed to a top surface of the back body part B (in the illustrated example, a top surface of the cover sheet 60 in the outer member 20). On the other hand, the main portion 73 has both side portions 73s adjacent to the second blocking positions B2 on outer sides (both lateral sides) thereof and an intermediate portion 73m disposed between the second blocking positions B2. Each of both the side portions 73s of the main portion 73 has a first portion 81 extending on the front side of the first blocking position B1, a second portion 82 being folded back toward a top side at a folding position along a front edge of the first portion 81 and extending backward, and a third portion 83 being folded back toward the top side at a folding position along a back edge of the second portion 82 and extending forward. An underside surface of the first portion 81 is fixed to the top surface of the back body part B, an underside surface of the second portion 82 is fixed to a top surface of the first portion 81, and the third portion 83 is unfixed to the second portion 82. The intermediate portion 73m of the main portion 73 is unfixed to the top surface of the back body part B (in the illustrated example, a top surface of the cover sheet 60 in the outer member 20 and the top surface of the inner member 10). As illustrated in the drawing, the base portion 72 and the first portion 81 may be fixed to each other by a hot melt adhesive HM1, and the first portion 81 and the second portion 82 may be fixed to each other by a hot melt adhesive HM2. Alternatively, although not shown, material welding of the barrier sheet 71 may be used for the fixing.
In addition, the main portion 73 includes the elongated barrier elastic member 74 provided to extend in the width direction WD from one of the third portions 83 to the other of the third portions 83. In the natural length state, as shown in
The dorsal side barrier 70 has a characteristic folding back structure and a characteristic arrangement of the barrier elastic member 74, as stated above. Thus, in the natural length state, the dorsal side barrier 70 has a structure as shown in
On the other hand, for wearing the diaper, as the main portion 73 of the barrier sheet 71 is made to be stretched in the width direction WD together with the barrier elastic member 74, in each of both the side portions 73s of the main portion 73, the folding back structure continued from the first portion 81 to the second portion 82 is maintained and the folding back structure continued from the second portion 82 to the third portion 83 is maintained to a certain extent as shown in
As is known from the above mentioned change in the first status and in the second status discussed above, in a worn state where the intermediate portion 73m of the main portion 73 is contracted to a certain degree, a pocket-type dorsal side barrier 70 is formed between the intermediate portion 73m of the main portion 73 and the top surface of the back body part B so as to open toward the crotch portion, because, the intermediate portion 73m of the main portion 73 is unfixed to the top surface of the back body part B, while the base portion 72 located at the back side of the intermediate portion and both the side portions 73s located on both the sides of the intermediate portion in the main portion 73 are fixed to the top surface of the back body part B directly or indirectly. As a result, when excrement reaches the pocket, the movement of the excrement toward the back side and the movements of the excrement toward both the sides can be prevented by the pocket. It is preferable that the standup portion 94 of the standup gather part 90 is configured so as to be located within the pocket as shown in
As stated above, in the present underpants-type disposable diaper, the dorsal side barrier 70 changes as in the above mentioned first status, as in the second status, and as in the worn state. Thus, when the diaper is used, the dorsal side barrier 70 can stand up automatically, so that a case where the diaper is used while the dorsal side barrier 70 is flattened is less likely to occur. Now, a case where a pad-type absorbent article is laid on the internal surface of the present underpants-type disposable diaper is considered. Before the underpants-type disposable diaper is worn, the dorsal side barrier of the diaper is in the first status as shown in
By determining appropriately dimensions of each portion of the barrier sheet 71 and a stretch rate of the third portion 83, to what degree the intermediate portion 73m of the main portion 73 pivots may be adjusted by to what degree the third portion 83 is stretched. For example, the following dimensions and stretch rate can be listed.
In this case, under a situation where the third portion is stretched at a stretch rate being 0.4 times or more the stretch rate at the maximum stretch, the above mentioned pivot portion may pivot about 90 degrees or more with respect to the top surface of the back body part B, then, reaching a situation where the third portion is stretched at a stretch rate being 0.6 times or more the stretch rate at the maximum stretch, the pivot portion may fall down on the back side (the waist opening side) like a situation at a maximum stretch as shown in
It is preferable that, in addition to the elongated barrier elastic member 74, an elongated shaping elastic member 75, which is provided to extend all over the width direction WD of the dorsal side barrier 70 through at least one of the first portion 81, the second portion 82 and the base portion 72, is provided, and the dorsal side barrier is elastically contracted in the width direction WD together with the elongated shaping elastic member 75 in the natural length state, because a shape of the dorsal side barrier may become organized, and in addition to this, it becomes easier for the intermediate portion 73m to be unfolded so as to spread in the natural length state. In the illustrated example, one elongated shaping elastic member 75 is provided to extend in the width direction WD from one of the second portions 82 to the other of the second portions 82 in the main portion 73. Further, three elongated shaping elastic members 75 are provided to extend in the width direction WD across both the side portions 73s of the base portion 72. However, the shaping elastic member 75 extending through the first portion 81 is not provided. When a plurality of shaping elastic members 75 are provided to extend through a portion selected from the base portion 72, the first portion 81 and the second portion 82, an interval in the front-back direction LD of the shaping elastic members may be about 3 to 7 mm.
In the underpants-type disposable diaper according to the present example, the outer member 20 has, in a front-back direction LD range including the side seal portions 21, a lower torso stretchable region (a stretchable region formed by the waist elastic member 24 and the under-waist elastic members 25), which is elastically contracted in the width direction WD, and a non-stretchable region, which is located in a middle part in the width direction WD of a range overlapping with the absorber 13. In this case, it is preferable that the base portion 72 of the barrier sheet 71 is fixed to a portion, which is adjacent to the absorber 13 at a back end on the waist opening side thereof in the lower torso stretchable region, so that the base portion is configured so as to be stretchable together with the lower torso stretchable region, because the shape of the dorsal side barrier 70 may be arranged. In addition, in the natural length state, the lower torso stretchable region is elastically contracted in the width direction WD, but the non-stretchable region is not contracted. Accordingly, as the position of a portion including the dorsal side barrier 70 is closer to the front side, contraction in the width direction WD of the portion becomes smaller such that the dorsal side barrier 70 becomes fan-shaped, as shown in
The barrier sheet 71 may have the same color or the same pattern between the top surface and the underside surface thereof. However, it is preferable that in the barrier sheet 71, at least in the intermediate portion 73m of the main portion 73 (more preferably the whole main portion 73), a color of the top surface thereof is different from a color of the underside surface thereof, respectively, because the user can easily recognize automatic deformation (change from the first status shown in
<Description of Terms in Specification>
In a case where the following terms are used in the specification, these terms have the following meanings unless otherwise specified in the specification.
The present invention can be used for general underpants-type disposable wearing articles such as underpants-type disposable diaper covers, and underpants-type sanitary napkins, in addition to the underpants-type disposable diapers as in the above example.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-032655 | Mar 2021 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2022/001052 | 1/14/2022 | WO |
