JP4338619B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article that has good fit around the legs and is excellent in wearing feeling and appearance.

  Conventionally, a pants-type absorbent article having a waist opening and a pair of leg openings is known.

  For example, Patent Document 1 includes a vertically long absorbent body and a pant-type exterior body that is positioned on the non-skin contact surface side of the absorbent body and fixes the absorbent body, and in a diaper crotch portion The underpants type diaper which made the width | variety of an exterior body below the width | variety of the absorber in the same part is described. Patent Document 1 describes that the leg is easy to pass with respect to the diaper.

JP-A-11-107007

  However, in the diaper described in Patent Document 1, the leg can be easily inserted, but even when worn, the absorbent body extends from both side edges of the outer body of the diaper crotch portion, so that it fits around the leg. It is inferior in nature, and the appearance (appearance) in the wearing feeling and wearing state is also bad.

  An object of the present invention is to provide an absorbent article that has good fit around the legs and is also excellent in the feeling of wear and the appearance of the crotch in a worn state.

  The present invention is an absorption comprising a vertically long absorbent main body having an absorbent core, and a pant-type exterior body that is positioned on the non-skin contact surface side of the absorbent main body and fixes the absorbent main body. The absorbent main body is formed by using a leak-proof sheet material on each of both sides in the longitudinal direction, and has an elastic leak-proof portion having elasticity in the longitudinal direction of the absorbent main body. And each elastic leak-proof portion extends in the width direction outward from the side edge of the exterior body at the crotch portion of the absorbent article, and the absorbent main body at the crotch portion has its width. There is provided an absorbent article having a portion fixed to an exterior body in a direction, and a portion positioned inward from a position of a side edge of the absorbent core and not fixed to the exterior body. Thus, the object is achieved.

  The absorbent article of the present invention has good fit around the legs, and is also excellent in the feeling of wear and the appearance of the crotch in the worn state.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
A shorts-type sanitary napkin 1 (hereinafter referred to as a napkin 1) as an embodiment of the absorbent article of the present invention has a vertically long structure having a liquid-retaining absorbent core 4 as shown in FIGS. An absorptive main body 5 and a pants-type exterior body 10 that is positioned on the non-skin contact surface (surface facing away from the wearer) side of the absorptive main body 5 and fixes the absorptive main body 5; Consists of.

  The absorptive main body 5 has a vertically long rectangular shape in plan view, and has a liquid-retaining surface sheet 2, a liquid-impermeable back sheet 3, and a liquid retaining property interposed between both sheets 2 and 3. An absorbent core 4 is provided. The absorbent core 4 has a vertically long shape, and has a narrow portion extending over a predetermined length at the center in the longitudinal direction, and has a wide portion with an enlarged width before and after the narrow portion. ing. The absorbent core 4 is sandwiched and fixed between the top sheet 2 and the back sheet 3. The top sheet 2 and the back sheet 3 are joined to each other at the peripheral edge of the absorbent core 4.

The absorbent main body 5 has its longitudinal direction aligned with the napkin longitudinal direction (up and down direction in FIG. 2) in the unfolded and extended state (the state shown in FIG. 2), and a region of a predetermined width in the center in the width direction is an adhesive. 6 is joined to the central portion of the exterior body 10 in the width direction. For joining the absorbent main body 5 and the exterior body 10, other known joining means such as heat sealing or ultrasonic sealing can be used instead of or together with the adhesive 6.
In the expanded and extended state, the side seal portion is peeled off (if there is no side seal portion, the side portions located on the left and right side portions of the wearer are cut), and the napkin (absorbent article) is in the expanded state. The unfolded napkin (absorbent article) was expanded until the elastic members of each part were extended to the design dimensions (same as the dimensions when flattened in a state where the influence of the elastic members was completely eliminated). State.

The napkin 1 has, when worn, an abdominal side A disposed on the wearer's ventral side, a dorsal side B disposed on the dorsal side, and a crotch C positioned therebetween.
As shown in FIG. 1, the exterior body 10 has a pants-type configuration. The pants-type form is a form having a waist opening 7 and a pair of leg openings 8, 8, and the shorts type is also included in the concept of the pants type.

  As for the exterior body 10, both side edges A1, A1 of the part forming the ventral side A and both side edges B1, B1 of the part forming the back side B are well-known such as heat sealing, high frequency sealing, ultrasonic sealing, etc. The pair of side seal portions 11, 11, the waist opening 7, and the pair of leg openings 8, 8 are thereby formed.

  The exterior body 10 is mainly composed of an outer layer sheet 12 that forms the outer surface of the napkin 1 and an inner layer sheet 13 that is laminated and bonded to the inside. A waist elastic member 14 and a leg elastic member 15 are bonded and fixed in a stretched state between the sheets 12 and 13 positioned at the peripheral edge of the waist opening 7 and the peripheral edge of the leg opening 8, and the waist gathers and legs. A gather is formed. Further, in the outer body 10 in a worn state (a state in which the waist opening 7 is directed upward), the waistline portion below the position where the waist elastic member 14 is disposed and above the upper end of the leg opening 8, A plurality of elastic members 16 are arranged across the width direction to form a waistline gather.

As shown in FIG. 3, the absorbent main body 5 has stretchable leak-proof portions 51 on both side portions in the longitudinal direction. The stretchable leak-proof portion 51 is configured using a leak-proof sheet material 52 and has stretchability in the longitudinal direction of the absorbent main body 5.
In the present embodiment, stretchable leak-proof portions 51 are formed on both sides of the absorbent main body 5 together with the three-dimensional gathers 54 by a water-repellent nonwoven fabric 52 as a leak-proof sheet material.

  As shown in FIG. 3, the portion of the water-repellent nonwoven fabric 52 that forms the stretchable leak-proof portion 51 is folded into two layers, outward in the width direction from the side edges of the front and back sheets 2 and 3. It is extended. Between the two layers of the water-repellent nonwoven fabric 52, a plurality of thread-like elastic members 53 are fixed in an extended state along the longitudinal direction of the absorbent main body 5 at intervals in the width direction. As shown in FIG. 3, the thread-like elastic members 55 and 56 for forming the three-dimensional gather 54 are also stretched along the longitudinal direction of the absorbent main body 5 at the portion where the three-dimensional gather 54 of the water-repellent nonwoven fabric 52 is formed. It is fixed with.

The stretchable leak-proof part 51 is configured by using the leak-proof sheet material 52, so that it fits around the legs of the crotch part and thereby exhibits a leak-proof effect.
Examples of the leak-proof sheet material include a water-repellent nonwoven fabric, a resin film, a laminated sheet of a nonwoven fabric and a resin film, and the like, and a water-repellent nonwoven fabric is preferably used from the viewpoint of fit to the legs and a feeling of wearing.
As the water-repellent nonwoven fabric, for example, an air-through nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric or the like whose fiber surface is rendered water-repellent by a surfactant treatment can be used.

As shown in FIG. 3, the stretchable leak-proof portion 51 extends outward in the width direction from both side edges 17 in the longitudinal direction of the exterior body 10 in the crotch portion C of the napkin 1. Here, the crotch part C of the napkin (absorbent article) 1 is the outer body 10 in the longitudinal direction (vertical direction in FIG. 2) of the napkin (absorbent article) in the unfolded and expanded state (state shown in FIG. 2). Are portions having recesses for forming the leg openings 8 on both sides thereof.
The stretchable leak-proof portion 51 does not need to extend entirely from the side edge 17 of the exterior body, and as shown in FIG. As long as it exists. The stretchable leak-proof part 51 should just have the part extended from the side edge 17 of the exterior body 10 in the natural state (state which contracted naturally without applying external force to a diaper).
The extension part of the stretchable leak-proof part 51 is in direct contact with the wearer at the time of wearing, and to the extent that the exterior body 10 and the leg part of the wearer can be partially prevented from contacting each other. It is preferable to extend from the side edge 17.
In addition, the dimension of each part as described in this specification is measured in the state which set the absorbent article to the expansion | extension state (state shown in FIG. 2).

The portion of the stretchable leak-proof portion 51 that extends outward in the width direction from the side edge 17 of the exterior body 10 (hereinafter referred to as the extended portion 51a) is the maximum value of the extension length L (see FIG. 3). However, 5-40% of the width W (see FIG. 2) of the exterior body 10 at the same position (position where the extension length L is maximum) in the longitudinal direction (vertical direction in FIG. 2) of the absorbent main body 5, It is preferable that it is 10 to 30% from the point which improves the fitting property and leak-proof property in a crotch part.
Speaking numerically for an adult pant-type absorbent article, the maximum value of the extension length L (see FIG. 3) is 5 to 50 mm, particularly 10 to 40 mm. This is preferable from the viewpoint of improving fit and preventing leakage. In addition, it is preferable that the said width W is 70-120 mm from a viewpoint of improving the fitting property of a crotch part.

  The length L1 (see FIG. 2) of the portion D having the extending portion 51a in the longitudinal direction of the absorbent main body 5 is 10 to 60% of the leg opening length L2 (see FIG. 2) of the napkin 1, and particularly 20 ˜45% is preferable from the viewpoint of improving fit at the legs from the crotch root and preventing leakage, and numerically speaking regarding an adult pant-type absorbent article, the length L1 is 50%. It is preferable from the same point that it is -200 mm, especially 70-150 mm.

Moreover, it is preferable that the part whose extension length L of the extension part 51a is 10-40 mm exists over the length of 5-15 cm in the longitudinal direction of the absorptive main body 5. FIG.
Further, the portion P where the extension length L of the extension portion 51a is the maximum is a range where the distance L3 (see FIG. 2) from the longitudinal center line XX of the napkin 1 is 5 to 80 mm, particularly 15 It exists in the range which is set to -60 mm from a viewpoint of improving the fitting property of a crotch part.

  The stretchable leak-proof part 51 in this embodiment has the edge part fixing part 57 joined and fixed to this exterior body 10 before and behind the said extension part 51a in the longitudinal direction of the absorptive main body 5. Yes. Specifically, at both ends in the longitudinal direction of the absorbent main body 5, the exterior body facing surface of the stretchable leak-proof section 51 is bonded and fixed on the exterior body 10 with an adhesive. Solid gathers 54 are also fixed on the stretchable leak-proof part 51 at both ends in the longitudinal direction of the absorbent main body 5. The three-dimensional gather 54 stands up toward the wearer's skin side by the action of the elastic members 55 and 56 except at both ends in the longitudinal direction of the absorbent main body 5.

  In the napkin 1 of the present embodiment, as shown in FIGS. 2 and 3, a pair of flexible shafts 59 are formed along the longitudinal direction of the absorbent main body 5 on both sides in the longitudinal direction of the absorbent main body 5. Has been. The flexible shaft is applied only to the region where the absorbent core 4 is present.

  The flexible shaft 59 makes it easy to bend the absorbent main body 5 in the width direction at that portion. The flexible shaft can be formed by (1) slits, narrow missing parts, cuts in the absorbent core. Etc. and using them as flexible shafts, (2) forming embossed grooves on the absorbent core and using the embossed grooves as flexible shafts, and (3) continuous line or intermittent on the absorbent core Examples of the method include forming a portion in which the constituent material is reduced in a linear shape and using the portion as a flexible shaft.

The flexible shaft 59 in the present embodiment is a narrow part (width of about 1 to 5 mm) provided in the absorbent core 4. The flexible shaft 59 in this embodiment is formed from the crotch part C to the back side part B as shown in FIG.
The length of the flexible shaft 59 (linear distance between both end portions) is preferably 20 to 80%, particularly 40 to 60% of the longitudinal total length L4 of the absorbent core 4, and in particular, the flexible shaft 59 is In the longitudinal direction of the absorbent main body 5, it is preferable that the absorbent body 5 is formed on one or both of the part D having the extended part 51a and the buttock facing part E.

Here, the buttocks facing portion E is a portion that is disposed to face the wearer's buttocks at the time of wearing, and from the diaper longitudinal center line XX to the leg opening side end portions on both side edges of the back side portion B. Is a range up to a line Y-Y. It should be noted that the buttock facing portion E generally has only to be a portion where the buttock faces, and does not mean a portion where only the buttock faces or a portion where the entire buttock faces.

  The flange-facing portion E has a portion in which the distance between the flexible shafts 59, 59 (interval in the width direction of the absorbent main body 5) is 40 to 150 mm, particularly a portion that is 50 to 90 mm. It is preferable from the point which improves the fitting property in the clearance gap and both sides. It is more preferable that both the flexible shafts 59 and 59 have a portion that spreads on both sides in the buttock facing portion.

  Between the flexible shafts 59 and 59 in the napkin 1, the stretchability of the longitudinal direction is provided. Specifically, as shown in FIGS. 3 and 4, a plurality of thread-like elastic members 9 extend along the longitudinal direction of the absorbent main body 5 between the absorbent core 4 and the back sheet 3. It is fixed in a state, thereby imparting stretchability in the longitudinal direction. On the other hand, the elastic member 9 does not exist on the flexible shaft 59.

As shown in FIG. 3, the absorbent main body 5 in the crotch C is positioned inward of the width direction of the portion 5 </ b> A fixed to the exterior body and the side edge 41 in the longitudinal direction of the absorbent core 5. And a portion 5B which is not fixed to the exterior body.
The absorbent main body 5 has a portion 5B that is not fixed to the exterior body 10 on the inner side in the width direction from the position of the side edge 41 of the absorbent core 5, so that when the wearer closes the leg, the elastic leak-proofing As shown in FIG. 5, the part 51 is easily accommodated inside the side edge 17 of the exterior body. By retracting the stretchable leak-proof part 51 in the closed leg state, it is possible to effectively prevent a sense of incongruity at the time of closing the leg while improving fit and leakage prevention at the time of normal and open leg. Can do.

The shorts napkin 1 of this embodiment can be worn in the same manner as a conventional pants-type absorbent article.
According to the napkin 1 of the present embodiment, since the crotch part C has the extension part 51a having leakproofness and stretchability, the extension part 51a of the stretchable leakproof part 51 is worn during wearing. As shown in FIG. 5, in the closed leg state, it is folded as if it is stored inside the exterior body 10, and in the opened leg state, the extended portion 51 a is stretched while fitting to the leg, thereby being worn. Fits well around the person's legs and provides excellent leakage prevention.
As described above, the absorbent main body 5 has the portion 5B that is not fixed to the exterior body 10 on the inner side in the width direction from the position of the side edge 41 of the absorbent core 5, and the portion 5B and the portion 5B. Both the outer part and the outer part can be deformed independently of the exterior body 10, so that the extending part 51 a of the stretchable leak-proof part 51 is inside the side edge 17 of the exterior body 10. This is because it is easily taken into the area.

Furthermore, in this napkin 1, as shown in FIG. 3, in the width direction of the absorbent main body 5, near the boundary between the portion 5A fixed to the exterior body 10 and the portion 5B not fixed to the exterior body 10. Since the flexible shaft 59 is formed, the fitability to the wearer is further enhanced by the flexibility of the absorbent main body 5, and the extension portion 51 a at the time of closing the leg can be more easily performed on the side edge of the exterior body 10. 17 is accommodated inside.
The width (accommodation width) S between the side edge 17 of the outer package 10 and the side edge 41 of the absorbent core is formed to be substantially the same as or wider than the extension length L of the extension 51a to be accommodated. Preferably it is.
In addition, 5A of the absorptive main body 5 currently fixed to the exterior body 10 may be continuously fixed to the exterior body 10 in the width direction, or may be partially fixed.

  Such an effect is advantageous when the width of the exterior body 10 in the crotch is particularly narrowed from the viewpoint of achieving both improvement in fit of the absorbent main body 5 (outer body 10) in the crotch part and prevention of leakage. It is. From such a viewpoint, it is preferable that the width W (see FIG. 2) of the exterior body 10 in the portion P where the extension length L of the extension portion 51a is maximum is 50 to 150 mm, particularly 70 to 100 mm.

  As shown in FIG. 5, the extended portion 51 a is folded inside the exterior body 10 so as to be accommodated, so that in a normal standing state (a state where both legs are not extremely expanded) Since the extended portion 51a is covered with the exterior body 10 and is difficult to see from the outside, the appearance during wearing is excellent.

  Further, since there is no absorbent core in the extending portion 51a, the extending portion 51a is rich in flexibility, and the extending portion 51a is flexibly deformed by the action of the elastic member, so that the circumference of the wearer's leg is better. To fit. Moreover, since there is no absorptive core, the liquid absorbed by the absorptive core is less likely to move to the leak-proof extension part, and liquid leakage is less likely to occur from the absorptive main body side part.

  Moreover, since the absorptive main body 4 has a pair of flexible shafts 59 and 59 and the elasticity is provided between these flexible shafts 59 and 59, as shown in FIG. Since the absorbent core 4 is easily deformed into a substantially W-shaped cross-sectional shape so as to conform to the concave and convex shape, the gap between the two collar portions and the fit between the two collar portions are improved, and the liquid passes through the gap between the collar portions. It is easy to reach the back of the napkin or obliquely behind it, preventing leakage.

The formation material of the napkin 1 mentioned above is demonstrated.
As materials for forming the top sheet 2, the back sheet 3, the absorbent core 4, the outer layer sheet 12, and the inner layer sheet 13, those conventionally used for shorts-type napkins, pants-type disposable diapers, and the like are used without particular limitation. Can do. For example, as the absorbent core, an aggregate of hydrophilic fibers such as pulp fibers or a structure in which a water-absorbing polymer is held can be used.

As mentioned above, although preferable embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above.
For example, the stretchable leak-proof part 51 can also be formed by a back sheet in which the outer body side surface and / or the opposite surface is extended outward in the width direction from both side edges of the absorbent core. . Further, instead of forming the stretchable leak-proof portion 51 and the three-dimensional gather 54 using a single leak-proof sheet material, the stretchable leak-proof portion 51 and the three-dimensional gather 54 are formed of separate sheet materials. You can also Further, the three-dimensional gather 54 can be omitted.
Further, the pair of flexible shafts 59 are not limited to those having a constant width between them or linear ones, for example, linear flexible shafts or flexible shafts curved in an arc shape, You may provide so that the width | variety between both may increase gradually as it goes to the buttock opposing part E from the crotch center part. Further, the elastic member 9 that imparts stretchability between the pair of flexible shafts 59 can be disposed between the back sheet 3 and the inner layer sheet 13 or between the outer layer sheet 12 and the inner layer sheet 13.
Further, the portion extending outward in the width direction from the side edge 17 of the exterior body 10 is linearly arranged in the longitudinal direction in a stretched state in FIG. Further, it may be formed so as to be curved toward the center in the width direction, and leakage prevention and fit may be enhanced.

  The disposable diaper of the present invention is suitable for a shorts-type sanitary napkin, but may be other pant-type absorbent articles such as a pant-type disposable diaper.

FIG. 1 is a perspective view showing a state in which a shorts-type sanitary napkin according to an embodiment of the present invention is viewed from the ventral side. FIG. 2 is a plan view showing a developed and extended state of the sanitary napkin of FIG. FIG. 3 is a cross-sectional view in the width direction of the sanitary napkin of FIG. 1, and is a view in which a part of the cross section at a portion P in FIG. 1 is omitted. FIG. 4 is a cross-sectional view showing a cross-section in the width direction when the sanitary napkin of FIG. 1 is worn, and is a view omitting a part of the cross-section at the buttocks facing portion. 5 is a cross-sectional view showing a cross-section in the width direction in the wearing state of the sanitary napkin of FIG. 1 (a cross-section at the same site as FIG. 3).

Explanation of symbols

1 Shorts-type sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 2 Top sheet 3 Back sheet 4 Absorbent core 5 Absorbent main body 51 Stretchable leak-proof part 51a Extension part 10 Exterior body 17 Side edge of exterior body A Abdominal side part B Back side part C Crotch part E Hip part opposing part

Claims (6)

An absorbent article comprising a vertically long absorbent main body having an absorbent core and a pant-type exterior body positioned on the non-skin contact surface side of the absorbent main body and fixing the absorbent main body. And
The absorbent main body has a stretchable leakproof portion that is constructed using a leakproof sheet material on both sides in the longitudinal direction and has stretchability in the longitudinal direction of the absorbent main body. The stretch leak-proof part extends in the width direction from the side edge of the exterior body at the crotch part of the absorbent article,
The absorbent main body in the crotch is a portion that is fixed to the exterior body in the width direction and a portion that is located inward from the position of the side edge of the absorbent core and is not fixed to the exterior body The absorbent main body, the part that is not fixed to the exterior body and the part that is located outward in the width direction from the part can be deformed independently of the exterior body,
In the stretchable leak-proof portion, in the portion extending outward in the width direction from the side edge of the exterior body, the absorbent core does not exist,
The absorbent main body is formed with a pair of flexible shafts along the longitudinal direction of the absorbent main body at a position spaced from the position of the side edge of the absorbent core toward the inner side in the width direction of the absorbent core. Absorbent articles that have been . The absorbent article according to claim 1, wherein an elastic member extending along the flexible shaft is not disposed at a position overlapping the flexible shaft. Between a pair of front hear Shiwajiku The absorbent article of claim 1 or 2, wherein the longitudinal direction of stretch is imparted. The absorptive article according to any one of claims 1 to 3 with which a buttock facing part arranged opposite to a wearer's buttock has a part whose interval between a pair of said flexible axes is 40-150 mm.   The stretchable leak-proof portion extending outward in the width direction from the side edge of the exterior body is formed so as to be housed inside the side edge of the exterior body when the wearer is closed. 4. The absorbent article according to any one of 4. The said main axis | shaft in the said crotch part has the said flexible shaft formed in the boundary part vicinity of the part fixed to the said exterior body, and the part which is not fixed to the said exterior body in the width direction. the absorbent article according to any of 1-5.