JP5734640B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers and incontinence pads.

  As an absorbent article such as a disposable diaper, a liquid-retaining absorbent body is provided, and includes a main body that is long in one direction, and a pair of leak-proof walls disposed on both sides along the longitudinal direction of the main body. Is known. In the conventional leak-proof wall structure, a leak-proof wall forming sheet extending in the longitudinal direction of the main body is fixed on a surface sheet that forms the skin contact surface of the main body, and the main body length is fixed to the leak-proof wall forming sheet. In general, an elastic member extending in a direction is fixed in an extended state. The leak-proof wall is fixed to the absorbent main body at the front end and the rear end in the longitudinal direction of the main body, and is provided with an elastic contraction force in the longitudinal direction of the main body between the front end and the rear end (inseam) Part) stands up toward the skin side of the wearer, thereby preventing leakage of excretory fluid at the side of the absorbent article.

  However, even an absorbent article having a leak-proof wall may have a gap between the standing leak-proof wall and the skin of the wearer, and excretion fluid may leak out from the gap. In order to prevent the liquid leakage that occurs over such a leak-proof wall, a method of increasing the elasticity of the elastic member arranged on the leak-proof wall and improving the adhesion of the leak-proof wall to the wearer's skin can be considered. However, this method may leave a tightening mark on the skin or cause the skin to swell. Therefore, Patent Document 1 describes a technique for forming a liquid flow stop by folding the protruding end of a leak-proof wall (solid gather) inward.

  Further, in Patent Document 2, a predetermined inclination angle with respect to the substantially width direction or the width direction of the absorbent article is set on the standing wall surface portion of the three-dimensional gather (leakage prevention wall) with an interval in the longitudinal direction of the absorbent article. A technique is described in which a plurality of second elastic members arranged so as to provide streak-like standing portions that stand up inward at predetermined intervals in the longitudinal direction of the absorbent article. According to the technique described in Patent Document 2, since the streak-like standing portion supports the three-dimensional gather, the three-dimensional gather is effectively prevented from falling and the fit property can be improved.

  In Patent Document 3, the absorbent article is divided into three regions, a blood drainage region corresponding region, an intermediate region, and a buttock corresponding region, in the longitudinal direction, and the angle of the surface that comes into contact with the skin of a three-dimensional gather (leak barrier) Describes a technique in which the blood discharge part corresponding region and the buttock corresponding region are made different, and the intermediate region is continuously changed. According to the technique described in Patent Document 3, a gap is hardly generated between the three-dimensional gather and the wearer's skin, and liquid leakage can be prevented.

  Patent Document 4 discloses a leak-proof cuff (leak-proof wall) that protrudes in a direction from the back sheet to the top sheet, and projects from the protrusion in both the inward and outward directions, and a plurality of elastic members. A technique is described in which the extension stress of the innermost elastic member among the plurality of elastic members is made higher than that of the other elastic members. According to the technique described in Patent Document 4, the seal surface area formed by the overhanging portion turns outward with the elastic member located at the innermost side as a fulcrum, and abuts around the wearer's leg over a wide area. For this reason, it is said that liquid leakage can be surely prevented.

JP 2003-275242 A JP 2009-233100 A JP 2009-285240 A Japanese Patent Laid-Open No. 11-276520

  In the leak-proof wall described in Patent Document 1, since the linear folded portion generated when the protruding end portion of the leak-proof wall is folded inwardly contacts the skin of the wearer, the leak-proof wall and the skin The contact is likely to be a point or a line, so that a gap is likely to occur between the leak-proof wall and the wearer's skin. In addition, the leak-proof wall described in Patent Documents 2 to 4 has improved fitting properties by devising the arrangement of the elastic member and the expansion and contraction characteristics and making the shape at the time of standing a specific bent shape. It is difficult to say that it is complicated and easy to manufacture. Moreover, in order to maintain the specific shape at the time of the standing of these conventional leak-proof walls, a certain amount of rigidity is required for the leak-proof walls themselves. Such a highly leak-proof wall may rub against the skin and swell up the skin, which places a heavy burden on the skin.

  Therefore, the subject of this invention is providing the absorptive article with which a leak-proof wall fits skin easily and has a high leak prevention effect.

  The present invention includes a main body having a shape that is long in one direction and having a back side portion, a crotch portion, and an abdominal side portion in the longitudinal direction, and each side portion along the longitudinal direction of the main body from the back side portion through the crotch portion. An absorbent article comprising a pair of leak-proof walls arranged continuously over the abdominal side, wherein the leak-proof wall is at least worn at the inner edge side along the longitudinal direction in the crotch part A base wall portion that stands up toward the wearer's skin, and an elastic stretchable portion that includes a plurality of elastic members that are connected to the inner edge of the base wall portion and arranged in a stretched state along the longitudinal direction. Each of the back side portion and the abdominal side portion is fixed to the main body in a state where the elastic stretchable portion is bent to the inner surface side of the base wall portion, Of the base wall portion is formed in the crotch portion. By site which is not fixed is to provide an absorbent article that exist in, it is obtained by solving the above problems.

  The absorbent article of the present invention has a leak-proof wall that fits gently on the skin and has a high leak-preventing effect.

FIG. 1 is a view showing a disposable diaper which is an embodiment of the absorbent article of the present invention, and schematically shows a state where the elastic member of each part is stretched and expanded in a planar shape (surface sheet) FIG. FIG. 2 is a cross-sectional view schematically showing a natural state of a cross section taken along the line II (cross section in the width direction) of FIG. FIG. 3 is a plan view showing a schematic configuration of a leak-proof wall as a main part of the diaper shown in FIG. FIG. 4 is a cross-sectional view schematically showing a cross section taken along the line II-II (cross section in the width direction) of FIG. FIG. 5 is a schematic diagram of a wearing state of the disposable diaper shown in FIG. 1. FIG. 6 is a cross-sectional view schematically showing an enlarged portion (elastic elastic portion fixing portion) surrounded by a circle in FIG. 3. FIG. 7 is an enlarged plan view schematically showing a part of FIG. 3 (the standing inhibition portion and its vicinity). FIG. 8 is a view showing a conventional disposable diaper, and FIG. 8 (a) is a view equivalent to FIG. 4 of a conventional disposable diaper (a cross-sectional view in the width direction of the dorsal side or abdominal side part in a natural state), FIG. (B) is the figure equivalent to FIG. 5 of the conventional disposable diaper (cross-sectional view of the width direction of the crotch part in a wearing state).

  Hereinafter, the absorbent article of the present invention will be described based on a disposable diaper which is a preferred embodiment thereof with reference to the drawings. As shown in FIG. 1, the diaper 1 of the present embodiment includes a main body 5 having a long shape in one direction X and a back side portion A, a crotch portion C, and a ventral side portion B in the longitudinal direction X, and the longitudinal direction of the main body 5. A pair of leak-proof walls 6, 6 are provided on both sides along X along the back side A, the crotch C, and the ventral side B.

  More specifically, the diaper 1 of the present embodiment is a so-called unfolded disposable diaper. As shown in FIGS. 1 and 2, a liquid-permeable surface sheet 2 that forms a skin facing surface, a non-skin facing surface, It has a liquid-impermeable or water-repellent (hereinafter collectively referred to as “liquid-impermeable”) back sheet 3 to be formed, and an absorbent body 4 disposed between both sheets 2 and 3, and is formed in a vertically long shape. ing. Each of the top sheet 2, the back sheet 3, and the absorber 4 has a vertically long shape that is long in one direction X. Each of the top sheet 2 and the back sheet 3 has a size larger than that of the absorber 4, and extends outward from the peripheral edge of the absorber 4. As shown in FIG. 2, the width of the top sheet 2 in the width direction Y is smaller than the width of the back sheet 3 in the width direction Y. The top sheet 2 and the back sheet 3 and the absorber 4 are joined by a known joining means such as a hot-melt adhesive.

  As shown in FIG. 1, the diaper 1 (main body 5) has, in the longitudinal direction X, a dorsal side A that is arranged on the back side of the wearer when worn, and a ventral side that is arranged on the ventral side of the wearer when wearing It has a part B and a crotch part C on which the wearer's crotch is arranged when worn. The crotch part C includes an excretion part facing part that is disposed so as to face the excretion part of the wearer when worn, and is located at the central part in the longitudinal direction X of the diaper 1 (main body 5). The diaper 1 (main body 5) has an hourglass-like shape in which both side edges of the crotch part C are curved in an inward arc shape, and a center part in the longitudinal direction X is inwardly bound in a plan view as shown in FIG. It has a shape.

  In the present specification, the skin facing surface is a surface directed to the skin side of the wearer when the absorbent article is worn in the absorbent article (diaper 1) or its constituent members (for example, the main body 5 and the leak-proof wall 6). The non-skin-facing surface is a surface of the absorbent article or its constituent member that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn. Moreover, a longitudinal direction is a direction along the long side of an absorbent article or its structural member, and a width direction is a direction orthogonal to this longitudinal direction. In the figure, the direction indicated by the symbol X is the longitudinal direction of the diaper 1 (main body 5, leak-proof wall 6), and the direction indicated by the symbol Y is the width direction of the diaper 1 (main body 5, leak-proof wall 6). .

  The absorbent body 4 has an hourglass shape in which both side edges of the crotch portion C are curved inwardly in an arc shape, and the center portion in the longitudinal direction X is inwardly bound in a plan view as shown in FIG. ing. As shown in FIG. 2, the absorbent body 4 includes an absorbent core 40 and a core wrap sheet 41 that covers the absorbent core 40. The core wrap sheet 41 is a single continuous sheet that covers the entire area of the skin-facing surface of the absorbent core 40 and is outward in the width direction Y from both side edges along the longitudinal direction X of the absorbent core 40. The extending portion is wound down below the absorbent core 40 to cover the entire area of the non-skin facing surface of the absorbent core 40. Between the absorptive core 40 and the core wrap sheet | seat 41, you may join by joining means, such as a hot-melt adhesive, in a predetermined part.

  As shown in FIG. 1, a pair of fastening tapes 8, 8 are provided on both side edges along the longitudinal direction X of the back side A of the diaper 1 (main body 5). More specifically, the both sides along the longitudinal direction X of each of the back side portion A and the ventral side portion B extend outward in the width direction Y from both side edge portions along the longitudinal direction X of the absorbent body 4. Side flaps 7 and 7 are formed, and a fastening tape 8 is attached to each side flap 7 so as to extend outward in the width direction Y. A fastening part 81 made of a male member of a mechanical surface fastener is attached to the fastening tape 8.

  Moreover, the to-be-attached area | region 9 which consists of the female member of a mechanical hook-and-loop fastener is formed in the non-skin opposing surface of the belly side part B of the diaper 1 (main body 5). The to-be-attached region 9 is formed by bonding and fixing a female member of a mechanical surface fastener to the non-skin facing surface of the back sheet 3 by a known joining means (for example, an adhesive or heat seal). The fastening part 81 of the tape 8 can be detachably fastened.

  As shown in FIG.1 and FIG.2, between the side seat | sheet 10 and the back surface sheet | seat 3 which are mentioned later in the right-and-left leg part distribute | arranged around a wearer's leg, there are a plurality (two in this embodiment). The thread-like elastic member 18 is arranged in an extended state along the longitudinal direction X, and a pair of leg gathers is formed in the leg portion when worn by contraction of the elastic member 18. Moreover, as shown in FIG. 1, between the top sheet 2 and the back sheet 3 in the waist part (end part of the longitudinal direction X of the main body 5) of the back side part A and the abdominal side part B, it is a belt-like elasticity. The members 19 are arranged in an expanded state along the width direction Y to form a waist gather. Each of the elastic members 18 and 19 is joined to the predetermined portion by a hot melt adhesive.

  1 and 2, each of the pair of leak-proof walls 6 and 6 has a certain width in the width direction Y and extends from the back side A to the abdomen B through the crotch C. One side sheet (sheet material for forming a leak-proof wall) 10 arranged continuously, and a plurality of (two in this embodiment) thread-like elastic members 15a arranged in an extended state on the side sheet 10 15b, and as shown in FIG. 2, at least the inner edge 11A side along the longitudinal direction X in the crotch C stands up toward the wearer's skin when worn, the base wall 11 And an elastic expansion / contraction part 12 including a plurality of elastic members 15a and 15b connected to the inner edge part 11A of the base wall part 11 and arranged in an extended state along the longitudinal direction X. Yes.

  As shown in FIG. 2, the outer edge 11 </ b> B side of the base wall 11 is joined to the main body 5 (the front sheet 2 and the back sheet 3) outside the width direction Y of the absorber 4. Starting from the joint 16, at least the inner edge 11 </ b> A side of the crotch C stands up toward the wearer's skin when worn. Here, “the inner edge 11A side of the base wall 11 stands up” means that the elastic stretchable part 12 connected to the inner edge 11A is located above the top sheet 2 and away from the top sheet 2. Means state. A joint portion 16 between the base wall portion 11 and the main body 5 (surface sheet 2) is linear in a plan view and extends over substantially the entire length in the longitudinal direction X of the leak-proof wall 6 (main body 5). The joint portion 16 is formed by applying an adhesive such as a hot melt adhesive. The linear joint 16 may be a continuous line in which the adhesive is continuously applied along the longitudinal direction X, or may be a broken line in which the adhesive is applied discontinuously. It can be a straight line or a curved line. The linear joint portion 16 in the present embodiment is a straight line and a continuous line.

  The elastic stretchable part 12 extends over substantially the entire length in the longitudinal direction X of the main body 5 (base wall part 11). As shown in FIG. 2, the elastic stretchable portion 12 is formed by folding the inner edge along the longitudinal direction X of the side sheet 10 toward the inner surface (the surface directed toward the absorber 4) and fixing it to the inner surface. It is a site where two side sheets 10 are superposed. A plurality of elastic members 15a and 15b extending in the longitudinal direction X are disposed between the two side sheets 10 and 10 that are folded back and face each other. A plurality of elastic members 15a and 15b extending in the longitudinal direction X are bonded and fixed to the side sheet 10 by a fixing means such as an adhesive in the stretched state, thereby providing elastic stretchability. The expansion / contraction direction coincides with the longitudinal direction X. The plurality of elastic members 15a and 15b are arranged over substantially the entire length in the longitudinal direction X of the elastic stretchable part 12, and are arranged at predetermined intervals in the width direction Y.

  The width of the elastic expansion / contraction part 12 (the length of the elastic expansion / contraction part 12 from the elastic member 15b arranged in the position closest to the inner edge 11A of the base wall part 11 among the plurality of elastic members arranged in the elastic expansion / contraction part 12) The length to the free end along the direction X is preferably 2 to 15 mm, particularly 3 to 10 mm, from the viewpoint of fit and leakage prevention.

  FIG. 3 shows a schematic configuration of a leak-proof wall 6 that is a main part of the diaper 1 of the present embodiment, and FIG. 4 schematically shows a cross section taken along line II-II of FIG. . In FIG. 3, from the viewpoint of easy description of the leak-proof wall 6, the illustration of other configurations of the diaper 1 other than the leak-proof wall 6 is simplified, but the actual configuration of the diaper 1 is illustrated in FIGS. 1 and 2. 4 and FIG. 4, for example, the cross section taken along line II in FIG. 3 is the same as FIG. 2. In FIG. 3, although the II-II line is shown in two places, FIG. 4 shows cross sections of these two places, both of which are configured as shown in FIG.

  As shown in FIG. 3 and FIG. 4, the elastic stretchable part 12 constituting the leak-proof wall 6 is fixed to the main body 5 on the back side part A and the ventral side part B, respectively, and the standing inhibition part of the leak-proof wall 6 60 is formed. On the other hand, the standing inhibition portion 60 is not formed in the crotch portion C and the portions near the crotch portion C of the back side portion A and the abdominal side portion B, and the standing inhibition portion 60 is formed in the longitudinal direction of the leak-proof wall 6. It is formed only at the front and rear ends of X. The formation position of the standing inhibition part 60 is the waist part in the abdominal part A and the back part B and the vicinity thereof. As described above, the elastic elastic portions 12 and 12 of the pair of left and right leak-proof walls 6 extending over substantially the entire length in the longitudinal direction X of the main body 5 are respectively stretched in the longitudinal direction X of the main body 5 in the longitudinal direction X By being fixed at the side portion A and the ventral side portion B), the diaper 1 is curved in a concave shape toward the skin contact surface side (surface sheet 2 side) due to the contraction of the elastic stretchable portion 12 in a natural state.

  As one of the main features of the diaper 1 of the present embodiment, as shown in FIG. 4, the standing inhibition portion 60 in each of the back side portion A and the abdominal side portion B has the elastic stretchable portion 12 as the inner surface 11 a of the base wall portion 11. (Surface directed to the absorber 4 side) The point which is fixed to the main body 5 in the state bent by the side is mentioned. The bent elastic stretchable part 12 is joined to the topsheet 2 constituting the main body 5 by an adhesive 70 such as a hot melt adhesive.

  The stand-up inhibiting portion 60 will be further described. The elastic stretchable portion 12 that is bent toward the inner surface 11a side of the base wall portion 11 includes all the elastic members 15a and 15b that constitute the elastic stretchable portion 12. An elastic member is not disposed at a portion (hereinafter also referred to as an elastic expansion / contraction portion facing portion) 17 of the leaking wall 6 (base wall portion 11) facing the bent elastic expansion / contraction portion 12. When the elastic member is not disposed in the elastic stretchable part facing part 17, as shown in FIG. 5 when the diaper 1 is worn, as compared with the case where the elastic member is disposed in the elastic stretchable part facing part 17. Since the inverted V-shape of the C leakage barrier 6 is stably formed, it is advantageous in that a gap is not easily formed between the wearer's skin and the outer side 12b of the elastic stretchable part. The details of the inverted V-shape of the leak-proof wall 6 of the crotch part C will be described later. In the present embodiment, no elastic member is disposed in a portion of the leak-proof wall 6 (base wall portion 11) that is closer to the outer edge portion 11B of the base wall portion 11 than the elastic stretchable portion facing portion 17 is. However, an elastic member may be arranged at the part.

  As shown in FIG. 4, the side sheet 10 that is a sheet material constituting the elastic stretchable part 12 is positioned between the inner surface 11 a of the base wall part 11 and the plurality of elastic members 15 a and 15 b in the standing up inhibition part 60. The inner part 12a and the inner part 12a are located on the opposite side across the plurality of elastic members 15a, 15b (positioned between the plurality of elastic members 15a, 15b and the top sheet 2), In the standing inhibition part 60, the outer part 12 b and the main body 5 (surface sheet 2) are joined by an adhesive 70. In the present embodiment, the inner portion 12a and the elastic expansion / contraction portion facing portion 17 [the portion of the leak-proof wall 6 (base wall portion 11) facing the bent elastic expansion / contraction portion 12) are not joined, but the inner portion 12a and the elastic elastic part opposing part 17 may be joined by the adhesive agent. In addition, the inner side part 12a and the outer side part 12b exist also in the leak-proof wall 6 which can stand up toward the wearer's skin side, as shown in FIG. In the standing leak-proof wall 6, the inner portion 12 a forms the inner surface (surface directed toward the absorber 4) of the leak-proof wall 6 together with the inner surface 11 a of the base wall portion 11, and the outer portion 12 b The outer surface of the leak wall 6 is formed.

  As described above, the back-side portion A and the abdominal-side portion B are fixed to the main body 5 in a state where the elastic expansion / contraction portion 12 of the leak-proof wall 6 is bent toward the inner surface 11a side of the base wall portion 11, and is prevented from standing. Is formed in the crotch part C, as shown in FIG. 2, the elastic stretchable part 12 is not fixed to the inner surface 11 a of the base wall part 11. In the present embodiment, the elastic stretchable part 12 positioned between the standing inhibition part 60 of each of the back side part A and the ventral side part B is a part surrounded by a circle denoted by reference numeral 61 in FIG. It is not fixed to the inner surface 11a of the base wall part 11 except for the part fixing part). That is, the elastic expansion / contraction part 12 located in the crotch part C in this embodiment and the part near the crotch part C of the back side part A and the abdomen side part B is a base wall except for a part indicated by reference numeral 61 in FIG. It is not fixed to other members including the portion 11, and is a free end portion of the leak-proof wall 6.

  Due to the above-described fixing configuration of the elastic stretchable portion 12 in the back side portion A and the ventral side portion B, the elastic stretchable portion that is not fixed to the inner surface 11a of the base wall portion 11 at least when the diaper 1 is worn, at least in the crotch portion C. 5, the inner portion 12a is spaced from the inner surface 11a of the base wall portion 11 and the outer portion 12b is in contact with the skin of the wearer (the wearer's buttocks are shown in FIG. 5), as shown in FIG. It is stable and forms and maintains an inverted V shape together with the inner edge portion 11A of the base wall portion 11 and the vicinity thereof in a sectional view as shown in FIG. Thus, the form which the outer side part 12b of the elastic expansion-contraction part 12 touches a wearer's skin is the wearer's skin like the conventional deployment type disposable diaper 90 shown in FIG. Compared to the form of touching (see FIG. 8 (b)), the elastic stretchable part 12 is easy to contact the surface with the skin, so the elastic stretchable part 12 fits gently on the skin, and there is less burden on the skin, High leakage prevention effect.

  The basic configuration of the conventional diaper 90 shown in FIG. 8 is the same as that of the diaper 1 of the present embodiment, but as shown in FIG. Is not bent to the inner surface 11a side of the base wall portion 11, and the standing inhibition portion 60 ′ in the back side portion and the abdominal side portion is bonded to the inner side portion 12a of the elastic stretchable portion 12 and the main body 5 (surface sheet 2). It is formed by bonding with an agent 70. Therefore, when the diaper 90 is worn, at the crotch portion, as shown in FIG. 8B, the elastic stretchable portion 12 does not bend so as to form an inverted V shape as shown in FIG. As a result of rising toward the skin side together with 11, the inner part 12 a comes into contact with the skin of the wearer, so that the elastic stretchable part 12 is easy to contact the skin with a point or a line. Large and has room for improvement in terms of fit.

  By the way, the procedure of mounting an unfolded disposable diaper such as the diaper 1 of the present embodiment or the conventional diaper 90 on an infant usually follows the following procedures 1 to 3. Procedure 1: The back side A of the diaper is laid under an infant laid on its back. Procedure 2: Grab the ventral side B of the diaper and extend the entire diaper in its longitudinal direction X. Procedure 3: The abdominal side B is brought into contact with the infant's body while adjusting the degree of extension of the diaper appropriately, and then the fastening tape 8 on the back side A is applied to the attachment region 9 on the abdominal side B. Fasten and fix. In steps 1 to 3, the leak-proof wall 6 in the crotch part C is formed on the skin facing surface (surface sheet 2) of the main body 5 when the procedure 2 is performed (when the diaper is elongated in the longitudinal direction). When the diaper stretch degree is relaxed after the completion of the wearing of the procedure 3 or later, it stands up toward the infant's skin side.

  Therefore, in the conventional unfolded diaper 90, as shown in FIG. 8 (b), if the standing state of the leak-proof wall 6 of the crotch part C is to be obtained, the standing state of the leak-proof wall 6 is obtained in the procedure 3, for example. It is effective to perform the fastening operation while confirming the above. However, it is necessary to quickly perform a diaper mounting (replacement) operation, and it is difficult to perform the procedure 3 in parallel with such a confirmation operation. In addition, it is difficult to visually check the standing state of the leak-proof wall 6 inside the diaper after the diaper has been attached, and an infant (wearer) guardian or the like operates the leak-proof wall 6 to stand up. Even if you do not stand up enough.

  On the other hand, in the diaper 1 of the present embodiment, as described above, as shown in FIG. 4, the elastic expansion / contraction part 12 of the leak-proof wall 6 in the back side part A and the abdominal side part B is the inner surface 11 a of the base wall part 11. Since the standing inhibition portion 60 is formed by being fixed to the main body 5 while being bent to the side, the leak-proof wall 6 of the crotch C is naturally inverted V-shaped as shown in FIG. Since the reverse V-shape is stably maintained while the diaper 1 is worn, good fit and leakage prevention are achieved. In addition, the formation and maintenance of the characteristic standing shape of the leakage preventing wall 6 according to the present embodiment is mainly performed by the above-described bending of the elastic expansion / contraction part 12 in the standing inhibition part 60, and Since special measures regarding materials such as increasing the rigidity of the leak-proof wall 6 itself are basically not required, in the diaper 1 of the present embodiment, the burden on the skin due to the leak-proof wall 6 is small, and the skin Trouble is unlikely to occur. The leak-proof wall having high rigidity may rub against the skin and swell the skin, which places a heavy burden on the skin.

  The leak-proof wall 6 according to the present embodiment will be further described. Between the standing inhibition portion 60 on the back side A and the standing inhibition portion 60 on the abdominal side B, the elastic expansion / contraction portion 12 is provided as shown in FIG. A portion (hereinafter also referred to as an elastic stretchable portion fixing portion) 61 fixed to the inner surface 11a of the base wall portion 11 exists. As shown in FIG. 6, the elastic stretchable portion fixing portion 61 is formed by joining the inner portion 12a of the elastic stretchable portion 12 to the inner surface 11a of the base wall portion 11 with an adhesive 71 such as a hot melt adhesive. Yes. The elastic stretchable part fixing part 61 is partially provided between the standing inhibition part 60 of each of the back side part A and the abdominal side part B, so that the standing inhibition part 60 of each of the back side part A and the abdominal side part B. On the inner surface 11a side of the elastic expansion / contraction part 12 in a part other than the elastic expansion / contraction part fixing part 61 (part where the elastic expansion / contraction part 12 is not fixed to the inner surface 11a of the base wall part 11) Since it becomes easy to crease, the inverted V-shape of the tip of the leak-proof wall 6 as shown in FIG. 5 is easily formed when the diaper 1 is worn.

  The elastic stretchable part fixing part 61 is preferably provided between the crotch part C and the standing inhibition part 60 of the back side part A and / or between the crotch part C and the standing inhibition part 60 of the ventral part B. C is preferably not provided. The reason is that, in the elastic stretchable portion fixing portion 61, the elastic stretchable portion 12 is fixed to the base wall portion 11, so that when the diaper 1 is worn, the reverse V of the distal end portion of the leak-proof wall 6 as shown in FIG. The shape is not formed, the fit of the leak-proof wall 6 (elastic expansion and contraction part 12) to the skin and the leak-proof property are relatively low, and those that are not placed in the crotch C where these characteristics are particularly important Is preferable. In this embodiment, as shown in FIG. 3, both between the crotch C and the standing inhibition part 60 of the dorsal side A and between the crotch C and the standing inhibition part 60 of the ventral part B, respectively. The elastic stretchable part fixing part 61 is provided one by one. In addition, the back side part A, the crotch part C, and the abdomen side part B are equivalent to each area | region when the diaper 1 (main body 5) is equally divided into the longitudinal direction X, and the crotch part C is the diaper 1 (main body 5). ) In the longitudinal direction X.

  The length L1 (see FIG. 3) along the longitudinal direction X of the elastic stretchable portion fixing portion 61 is preferably relative to the total length L (see FIG. 3) in the longitudinal direction X of the elastic stretchable portion 12 (leakage prevention wall 6). 50 to 90%, more preferably 60 to 80%. Moreover, the length L1 of the elastic expansion / contraction part fixing | fixed part 61 becomes like this. Preferably it is 3-20 mm, More preferably, it is 5-15 mm.

  In the present invention, when the diaper 1 is worn, in addition to the formation of the elastic stretchable portion fixing portion 61 described above, from the viewpoint of further facilitating the formation of the inverted V shape at the tip of the leak-proof wall 6 as shown in FIG. In addition, one or more of the following configurations a) to d) can be employed. The configurations of a) to d) below are mainly a part of the plurality of thread-like elastic members 15a and 15b arranged on the elastic stretchable part 12, specifically, the inner edge of the base wall part 11. The purpose is to relatively enhance the stretchability of the elastic member 15a (the elastic member located in the innermost portion in the width direction Y in the standing-up inhibition portion 60) 15a most distant from 11A.

  a) Among the plurality of elastic members 15a and 15b arranged on the elastic expansion / contraction part 12, the elastic member 15a arranged at the position farthest from the inner edge 11A of the base wall part 11 is the elastic expansion / contraction part 12 The length (fixed length) fixed to the side seat 10 which is a sheet material constituting the elastic stretchable part 12 is longer than the other elastic members 15b arranged in the base (see FIG. 3). Here, the “fixed length of the elastic member” is the length of the portion of the elastic member that is fixed to the sheet material (side sheet 10) that constitutes the elastic stretchable portion, and is not necessarily the total length of the elastic member. It does not match. The portion of the elastic member that is fixed to the sheet material is normally stretched. Therefore, the “fixed length of the elastic member” usually matches the length of the stretched portion of the elastic member.

  The ratio (L2 / L3) between the fixed length L2 of the elastic member 15a (see FIG. 3) and the fixed length L3 of the elastic member 15b (see FIG. 3) is preferably 1.05-1.30, more preferably 1.10 to 1.25. The fixed length L2 of the elastic member 15a is preferably 150 to 400 mm, more preferably 180 to 350 mm.

  b) Among the plurality of elastic members 15 a and 15 b arranged on the elastic stretchable part 12, the elastic member 15 a arranged at the position farthest from the inner edge 11 </ b> A of the base wall part 11 is the elastic stretchable part 12. The elastic member 15 is fixed to the sheet material (side sheet 10) constituting the elastic stretchable part 12 at a higher expansion ratio than the other elastic members 15b disposed on the side. As a specific method of fixing the elastic member 15a at a higher expansion ratio than the other elastic members 15b, for example, a method of fixing the elastic member 15a to the side seat 10 in a state where the elastic member 15a is extended longer than the other elastic members 15b. Is mentioned.

  The ratio (P1 / P2) between the expansion ratio P1 of the elastic member 15a and the expansion ratio P2 of the elastic member 15b is preferably 1.05 to 1.30, more preferably 1.10 to 1.25. Further, the expansion ratio P1 of the elastic member 15a is preferably 150 to 300%, more preferably 180 to 270%. The expansion ratio of the elastic member is measured as follows.

<Measuring method of expansion ratio of elastic member>
A measurement sample is prepared by cutting out the elastic member to be measured together with the sheet to which the elastic member is fixed. For example, when the elastic members to be measured are the two elastic members 15a and 15b arranged in the elastic expansion / contraction part 12, the elastic members 15a and 15b are respectively attached to the side sheets 10 to which the elastic members are fixed. The two elastic members 15a and 15b with the side sheet 10 cut out separately and thus cut out are used as measurement samples. In the elastic member of the measurement sample, two arbitrary points in the portion fixed to the sheet (side sheet 10) are marked, and the length of the unstretched state (the state where no external force is applied) between the two points is marked. Measure the thickness. In addition, a load that does not cause substantial elongation / breakage of the sheet in the measurement sample is applied to the sheet, the elastic member in the measurement sample is in an extended state, and the length between the two points in the extended state is measured. From the ratio of the measured value (length in the stretched state) to the length in the unstretched state (length in the stretched state / length in the unstretched state), the stretch magnification of the target elastic member is calculated.

  c) Among the plurality of thread-like elastic members 15a and 15b arranged on the elastic expansion / contraction part 12, the elastic member 15a arranged at the position farthest from the inner edge part 11A of the base wall part 11 is elastic expansion / contraction It is thicker than the other elastic members 15b arranged in the portion 12. The ratio (R1 / R2) between the fineness R1 of the thread-like elastic member 15a and the fineness R2 of the thread-like elastic member 15b is preferably 1.2 to 3.0, more preferably 1.5 to 2.5. The fineness R1 of the elastic member 15a is preferably 310 to 940 dtex, more preferably 470 to 780 dtex when the elastic member 15a is a polyurethane thread rubber.

  d) The length L4 (see FIGS. 3 and 7) in the longitudinal direction X of the standing inhibition portion 60 [the portion of the elastic stretchable portion 12 fixed by the main body 5 (surface sheet 2) and the adhesive 70). Gradually increases from the inside to the outside in the width direction Y (from the left side to the right side in FIG. 7). As shown in FIG. 3 and FIG. 7, the plan view shape of the standing-up inhibiting unit 60 according to the present embodiment is a trapezoidal shape, and two sides (short side and long side) parallel to each other in the trapezoid-shaped standing-up inhibiting unit 60. ) Is located on the inner side of the main body 5.

  The length L4 (see FIGS. 3 and 7) of the standing inhibition portion 60 is preferably 5 to 20% with respect to the total length L (see FIG. 3) in the longitudinal direction X of the elastic stretchable portion 12 (leak barrier 6). More preferably, it is 7.5 to 17.5%. Further, the length L4 of the standing inhibition portion 60 is preferably 15 to 100 mm, and more preferably 30 to 80 mm.

  In the present embodiment, the plurality of elastic members 15a and 15b constituting the elastic expansion / contraction part 12 are each fixed to the inner part 12a of the side seat 10, and are not fixed to the outer part 12b. That is, the plurality of elastic members 15a and 15b are fixed to the inner portion 12a by fixing means (not shown) such as an adhesive, whereas the outer portion 12b is provided with such fixing means. In addition, the plurality of elastic members 15a and 15b and the outer portion 12b are made contactable and separable. As described above, the outer portion 12b is a portion that comes into contact with the wearer's skin (see FIG. 5). The outer portion 12b is a portion that is flexible and requires good texture, and elastic members 15a and 15b are provided on the outer portion 12b. If fixed, there is a possibility that the outer portion 12b becomes hard and the texture becomes worse by using a fixing means such as an adhesive. Therefore, in the present embodiment, the plurality of elastic members 15a and 15b constituting the elastic stretchable part 12 are fixed to the inner part 12a that is basically a part that does not touch the skin, and the leak-proof wall 6 is attached to the wearer. I try to fit the skin more gently.

  If the formation material of each part in the diaper 1 is demonstrated, as the surface sheet 2 and the back surface sheet 3, various things conventionally used in the said technical field can be used. As the surface sheet 2, various liquid-permeable sheet materials such as a nonwoven fabric and an apertured film can be used. As the back sheet 3, various liquid impervious materials such as a resin film having no moisture permeability, a resin film having fine pores and moisture permeability, a nonwoven fabric such as a water-repellent nonwoven fabric, and a laminate of these and other sheets. Or water repellent materials can be used.

  As a material constituting the absorber 4, various materials conventionally used in the technical field can be used without particular limitation. As the absorptive core 40, for example, a fiber aggregate made of hydrophilic fibers such as wood pulp or synthetic fiber, or a fiber aggregate in which a particulate superabsorbent resin is held can be used. As the core wrap sheet 41 that covers the absorbent core 40, for example, paper such as tissue paper, various nonwoven fabrics, apertured films, and the like can be used.

  As the side sheet 10 which is a sheet material constituting the leak-proof wall 6 (base wall portion 11 and elastic stretchable portion 12), various types conventionally used in the technical field can be used without particular limitation, for example, A water-repellent nonwoven fabric, a sheet made of a resin film, a laminate of a nonwoven fabric and a resin film, and the like can be used. In particular, it is preferable to use a water-repellent SMS (spunbond-meltblown-spunbond) non-woven fabric from the viewpoint of good touch and prevention of lateral leakage. In addition, as the plurality of elastic members 15a and 15b constituting the elastic expansion / contraction part 12 of the leak-proof wall 6, various members conventionally used in the technical field can be used without particular limitation.

  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, the elastic member which comprises an elastic expansion-contraction part should just be plural (2 or more), and is not limited to two.

  Further, the absorbent article of the present invention may be an unfolded disposable diaper having a fastening tape as in the above embodiment, or a pants-type disposable diaper formed in a pants shape in advance, such as an incontinence pad. May be.

1 disposable diaper (absorbent article)
2 Surface sheet 3 Back sheet 4 Absorber 5 Main body 6 Leak barrier 10 Side sheet [Sheet material constituting leak barrier (elastic stretchable part)]
DESCRIPTION OF SYMBOLS 11 Base wall part 11A Inner edge part 11B of a base wall part Outer edge part 11a of a base wall part Inner surface 12 of a base wall part Elastic elastic part 12a Inner part 12b Outer part 15a, 15b Elastic member 17 Elastic elastic part opposing part 60 Standing inhibition Part 61 elastic elastic part fixing part A dorsal part B ventral part C crotch part X longitudinal direction Y width direction

Claims (6)

A main body having a long shape in one direction and having a dorsal part, crotch part, and abdominal part in the longitudinal direction, and both side parts along the longitudinal direction of the main body from the dorsal part to the ventral part via the crotch part. An absorbent article comprising a pair of leak-proof walls arranged continuously over a space,
Each of the pair of leak-proof walls has an inner edge along the longitudinal direction, and an outer edge along the longitudinal direction that is located outside the inner edge in the width direction of the main body, and at least a base wall portion to which the inner edge side is erected toward the skin side of a wearer in the crotch portion, in a stretched state along the articulated and longitudinal on the inner edge of the base wall portion An elastic stretchable part including a plurality of elastic members arranged,
Each of the dorsal side portion and the ventral side portion is fixed to the main body in a state where the elastic stretchable portion is bent toward the inner surface side of the base wall portion, so that the standing prevention portion of the leak-proof wall is formed. ,
The crotch part has a portion where the elastic stretchable part is not fixed to the inner surface of the base wall part ,
Of the plurality of elastic members arranged in the elastic expansion / contraction part, the elastic member arranged in the position farthest from the inner edge of the base wall part is arranged in the elastic expansion / contraction part. An absorbent article having a long length, which is fixed to a sheet material constituting the elastic stretchable part, as compared with other elastic members . A main body having a long shape in one direction and having a dorsal part, crotch part, and abdominal part in the longitudinal direction, and both side parts along the longitudinal direction of the main body from the dorsal part to the ventral part via the crotch part. An absorbent article comprising a pair of leak-proof walls arranged continuously over a space,
Each of the pair of leak-proof walls has an inner edge along the longitudinal direction, and an outer edge along the longitudinal direction that is located outside the inner edge in the width direction of the main body, and at least a base wall portion to which the inner edge side is erected toward the skin side of a wearer in the crotch portion, in a stretched state along the articulated and longitudinal on the inner edge of the base wall portion An elastic stretchable part including a plurality of elastic members arranged,
Each of the dorsal side portion and the ventral side portion is fixed to the main body in a state where the elastic stretchable portion is bent toward the inner surface side of the base wall portion, so that the standing prevention portion of the leak-proof wall is formed. ,
The crotch part has a portion where the elastic stretchable part is not fixed to the inner surface of the base wall part ,
An absorptive article in which a portion where the elastic elastic part is fixed to the inner surface of the base wall part exists between the standing inhibition part of the back side part and the standing inhibition part of the abdominal side part .   Of the plurality of elastic members arranged in the elastic expansion / contraction part, the elastic member arranged in the position farthest from the inner edge of the base wall part is arranged in the elastic expansion / contraction part. The absorbent article of Claim 1 or 2 currently fixed to the sheet | seat material which comprises this elastic expansion-contraction part by high expansion ratio compared with another elastic member.   The plurality of elastic members arranged in the elastic expansion and contraction portion are all in the form of threads, and among these plurality of elastic members in the form of threads, the elastic members are arranged at positions farthest from the inner edge of the base wall portion. The absorbent article according to any one of claims 1 to 3, wherein the elastic member is thicker than other elastic members disposed in the elastic stretchable portion.   The absorbent article according to any one of claims 1 to 4, wherein the length in the longitudinal direction of the standing inhibition portion is gradually increased from the inside to the outside in the width direction of the main body. The sheet material constituting the elastic expansion and contraction portion includes an inner portion positioned between the inner surface of the base wall portion and the plurality of elastic members in the standing-up inhibition portion, and the inner portion includes a plurality of the elastic members. It has an outer part located on the opposite side across the member,
The absorbent article according to any one of claims 1 to 5 , wherein the plurality of elastic members are each fixed to the inner portion of the sheet material and are not fixed to the outer portion.

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