JP2012130585A - Pants-type absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pants-type absorptive article in which the side part of an absorptive body of which easily fits to the body of a wearer when worn, which is adaptable also to force in a direction to the underside of the crotch without strongly tightening the waistline and/or the circumference of the legs of the wearer even after excretion after worn so as to be effectively prevented from sliding off, and which makes diaper maintain favorable body-following properties and leakage-preventing properties.SOLUTION: The pants-type absorptive article includes: a crista iliaca area 62 lying between a waist opening part 11 and a leg opening part 12 at a ventral-side part F and covering the crista iliaca of the wearer when worn; a front-side elastic member 81 ranging from a part upper than the crista iliaca area at the side edge part of the ventral-side part or the circumference thereof to a crotch-underside part C through the crista iliaca area; and a back-side elastic member 83 ranging from the side edge part of a back-side part R or the circumference thereof to the crotch-underside part. The side edge parts of the ventral-side part and the back-side part are joined with each other at side seal parts 7 so that the front-side elastic member and the back-side elastic member are connected to each other. The front-side elastic member and the back-side elastic member at the crotch-underside part are set up on a center absorptive body 31 along a longitudinal direction at the outward of the side edge thereof.

Description

  The present invention relates to a pants-type absorbent article such as a disposable diaper.

  About absorbent articles, such as a disposable diaper, the material and structure of each member were improved, and the improvement of the function and a feeling of wear has been aimed at. As one of them, a device has been devised to dispose of an elastic member in a disposable diaper so as to suppress leakage and improve fit, and recently, a high-functional one according to the use situation and the type of article has been proposed.

  For example, a pants-type disposable diaper in which a U-shaped curved elastic member that extends from one side joining edge to the crotch and crosses the crotch side and reaches the other side joining edge is arranged in each of the front body and the back body of the diaper Is disclosed (see Patent Document 1). Also, a first mounting elastic member arranged in a V shape across the crotch from the waist opening edge and a second mounting member arranged in a V shape across the crotch from the joining edge slightly below it. The underpants type disposable diaper which has 2 elastic members in each of the front body and the back body is indicated (refer to patent documents 2). In these diapers, the U and V elastic members from the waist opening to the crotch are used to pull up the front and back bodies independently from the crotch in the height direction to prevent slipping off and to the body. It is said that the fit and ease of wearing are improved.

JP 2006-43415 A JP 2006-271454 A

This type of absorbent article typified by disposable diapers increases its weight by absorbing excrement such as urine in the absorbent body, and the weight becomes a load in the crotch direction and tries to lower the entire diaper. To do. In particular, in adult diapers, the amount of excrement of the wearer is large, and a urine collecting pad may be used in layers, so that the force acting in the crotch direction of the diaper is greater than that for infants. Even in diapers for infants, the amount of excrement may increase depending on the age and physique of the wearer. As described above, the degree of ease of slipping of the diaper varies depending on the use situation, the wearer's physique, etc., but the weight increases due to the absorption of excrement such as urine, which becomes a load in the crotch direction. The problem of diaper misalignment due to the situation cannot be ignored from the original function of diapers.
Usually, such a slippage is adjusted by the circumferential tightening force around the waist and the tightening force around the foot, taking into account the weight during use. Also in the diaper described in the above-mentioned patent document, since the weight of the crotch is easily transmitted directly to the vicinity of the waist, some support such as tightening tightening around the waist is required. However, if the tightening force on the waistline and undercarriage is increased at the same time, depending on the user's body shape, a feeling of pressure on the waistline may be felt from the beginning of use.
Further, depending on the wearer's body shape, when the diaper is worn, the side edge of the absorbent body may be difficult to pull up or bend up due to the inner side of the thigh. In this case, the absorbent body does not adhere to the body, and there is a possibility that excrement will leak laterally after wearing. Further, when the wearer is bedridden, the diaper is pushed at the rounded portion of the buttocks, and a gap tends to occur from the crotch to the back side, and liquid leakage may occur from the gap. The same applies to changes in posture when turning over. As much as possible, I want to fit the area around the crotch of the absorbent body along the body so that it follows the movement of the body.

  From the above viewpoint, the side of the absorbent body easily fits the body when worn, and even after excretion after wearing, it can adapt to the force in the crotch direction without tightening the wearer's waistline or underbody strongly and slipping off An object of the present invention is to provide a pant-type absorbent article that can effectively prevent the diaper and maintain good followability to the body of the diaper and leakage prevention.

  The present invention comprises an exterior material and an absorbent main body having a central absorbent body arranged in the center in the width direction on the skin surface side, and is divided into a ventral part, a crotch part, and a dorsal part in the longitudinal direction, A pant-type absorbent article in which both side edges of the front and back sides are joined together to form a pair of side seals, a waist opening and a pair of leg openings, wherein the waist opening of the ventral side There is a ventral iliac crest region that covers the wearer's iliac crest when worn, between the leg opening and the leg opening, above the ventral flank side region or its surrounding ventral iliac crest region A front elastic member extending from the iliac crest region to the crotch portion, and a rear elastic member extending from the side edge portion of the back side portion or the periphery thereof to the crotch portion, the abdominal side portion and the The side edge portion of the back side portion is configured so that the front elastic member and the rear elastic member are connected to each other. The front elastic member and the rear elastic member in the crotch are provided with a pants-type absorbent article that is disposed along the longitudinal direction outside the side edge with respect to the central absorbent body. This solves the above problem.

  The pants-type absorbent article of the present invention can easily fit the body at the side of the absorbent body when worn, and even in the crotch direction even after excretion after wearing, without tightening the wearer's waistline or underbody strongly. Adapting to effectively prevent slippage and maintain excellent followability to the body of the diaper and leakage prevention can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing a pants-type disposable diaper 10 as a first embodiment of the present invention as a generally worn shape as viewed from the upper left side of a wearer. FIG. 2 is a partially cut-out development plan view schematically showing a developed and extended state of the pant-type diaper shown in FIG. 1 from the skin surface side. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2. It is explanatory drawing which shows the shape of an iliac typically. It is a side view of the human body for demonstrating the positional relationship with respect to the human body of an iliac crest area | region. It is explanatory drawing which showed typically the state of the wearer who wears the underpants type diaper of this embodiment, (a) is the front view, (b) is a left view. It is explanatory drawing which showed typically the crotch part of the underpants type disposable diaper of this embodiment from the back side a little diagonally. It is the expansion | deployment top view which showed typically the another underpants type disposable diaper as 2nd Embodiment in this invention.

Hereinafter, an adult pants-type disposable diaper which is a preferred embodiment of the present invention will be described in detail.
FIG. 1 is a perspective view schematically showing a pants-type disposable diaper 10 according to a first embodiment of the present invention as a generally worn shape as seen from the upper left side of the wearer's stomach. FIG. 2 is a partially cutaway developed plan view schematically showing the developed and stretched state of the pant-type diaper shown in FIG. 1 from the skin surface side. FIG. 3 is an enlarged cross-sectional view taken along line III-III in FIG.

  The pants-type disposable diaper 10 of this embodiment is provided with the exterior body 2 and the absorptive main body 3 which has the center absorber 31 distribute | arranged to the width direction center by the skin surface side. As shown in FIG. 2, the diaper 10 is positioned between the abdominal side F disposed on the wearer's abdomen and the back side R disposed on the dorsal side in the longitudinal direction (Y direction). It is divided into the crotch part C. Moreover, the exterior body 2 has a substantially hourglass shape in which both side edges at the center in the longitudinal direction are bound inward in the width direction (X direction), and becomes the outer shape of the diaper 10. This diaper 10 is folded in the vicinity of the longitudinal center line CL of the diaper of the crotch C from the unfolded state, and both sides 25 and 25 of the abdominal side F of the exterior body 2 and both sides of both sides of the back side R By joining 26 and 26, the waist opening part 11 and a pair of leg opening part 12 are formed with the shape at the time of wear (refer FIG. 1). The joint part of both side parts 25 and 26 becomes the side seal part 7 extended from the waist opening part 11 to the leg opening part 12 and joined in a wearer's height direction (refer FIG. 1). For the joining of the side seal portion 7, for example, heat seal, high frequency seal, ultrasonic seal or the like is used.

  The absorbent main body 3 includes a liquid-permeable top sheet 32, a liquid-impermeable or water-repellent back sheet 33, and a central absorbent body 31 interposed between the two sheets, and has a substantially vertically long shape. It is. The absorptive main body 3 has its longitudinal direction in the diaper longitudinal direction (Y direction) on the skin surface side of the exterior body, and extends from the crotch C of the exterior body 3 to the abdominal side F and back side R. Arranged and fixed. As the fixing method, for example, a method using an adhesive, heat sealing, ultrasonic sealing or the like is used. The central absorbent body 31 has a constricted portion at a portion located in the crotch portion C in plan view, and has a bilaterally symmetric shape having a plurality of cut shapes. At least in the crotch portion C, there are side regions 37 and 37 where the central absorbent body 31 is not disposed on both sides of the absorbent main body 3, and in the present embodiment, the side regions 37 and 37 are the ventral region F and the side regions 37 and 37, respectively. It extends to the back side R. In the present invention, the central absorbent body 31 has a function of retaining the absorption of diapers from the urine excretion corresponding areas 39a and 39b (area 39a for men and area 39b for women) from the wearer corresponding area 39c. It is an absorber that bears the main part. For example, the central absorbent body 31 does not include a separate or partially continuous auxiliary absorbent body disposed on the side edge of the absorbent main body to prevent side leakage. In addition, the shape of the central absorbent body 3 of the present invention is not limited to that of the present embodiment, and may be a rectangle, an hourglass shape, or other shapes.

  The side sheets 4 are arranged along the longitudinal direction of the absorbent main body 3 on both sides of the surface sheet 32 on the skin contact surface side (see FIG. 2). The side sheet 4 extends outward in the width direction of the central absorbent body 31 and is rolled down to the non-skin contact surface side, and between the central absorbent body 31 and the back sheet 33 or between the back sheet 33 and the exterior body 2. It is fixed in between (see FIG. 3). Edges on the inner side in the width direction of the side sheet 4 become a pair of free ends 41 that are not fixed to the top sheet 32, and have a leak-proof cuff elastic member 42 inside the folded end. When the diaper is worn, the free ends 41 and 41 stand up by the contraction of the leak-proof cuff elastic member 42 to form a leak-proof cuff, thereby forming a pocket p, which has an effect of preventing lateral leakage of liquid or the like (see FIG. 3). .

  As shown in FIG. 2, in the diaper 10 developed at the side seal portion, the exterior body 2 has an hourglass shape and is disposed so as to cover the absorbent main body 3 at the center. The exterior body 2 is composed of an inner layer sheet 21 on the skin surface side and an outer layer sheet 22 on the non-skin surface side, and a waist elastic member at an edge in the vicinity of the waist opening 11 is not shown between the two sheets. A plurality of waistline elastic members positioned on the crotch side are sandwiched and fixed in an expanded state in the width direction (X direction). The elastic member which becomes an annular shape in these assembled states allows the diaper 10 to have a good fit by properly tightening the waist of the wearer. Also, a plurality of paired left and right leg elastic members 53 (three in the figure) are arranged in the vicinity of the edge of the leg opening 12, and the base of the wearer's foot is properly tightened in a balanced manner. Demonstrate wearability and prevent leakage of liquid from this part.

  Although details regarding the materials of the top sheet 32, the exterior body 2, and the absorbent main body 3 will be described later, in the present embodiment, the top sheet 32 quickly transmits the excreted body fluid and transmits it to the absorber. From the viewpoint of touch, a hydrophilic air-through nonwoven fabric is used. The back sheet 33 is made of a porous film that is liquid-impermeable and has water vapor permeability. The exterior body 2 is composed of an inner layer nonwoven fabric 21 on the skin surface side and an outer layer nonwoven fabric 22 on the non-skin surface side, and is substantially liquid-impermeable and has air permeability and water vapor permeability. As the central absorbent 31, a pulp fiber or an aggregate containing an absorbent polymer or the like covered with a core wrap sheet (not shown) is used. The pants-type diaper 10 of the present embodiment is a line in which the top sheet 32 side is directed to the skin contact surface of the wearer and the longitudinal direction is arranged from the lower abdomen to the buttocks, and the width direction is connected to the left and right feet. It is arranged in the direction of

  In the present invention, unless otherwise specified, the side in contact with the human body is referred to as the skin surface side or the skin contact surface side or the surface side, and the opposite side is referred to as the non-skin surface side or the non-skin contact surface side or the back surface side. That's it. The direction positioned on the front side of the human body when worn is referred to as the front, and its end is referred to as the front end, and the direction positioned on the rear is referred to as the rear, and the end is referred to as the rear end. The normal direction of the front or back surface of the absorbent article is referred to as the thickness (thickness) direction, and the amount is referred to as thickness (thickness). Furthermore, a direction having a relatively long length in a plan view of the absorbent article or the absorbent body is referred to as a longitudinal direction, and a direction orthogonal to the longitudinal direction is referred to as a width direction. The longitudinal direction typically coincides with the front-rear direction of the human body when worn.

  In the pants-type disposable diaper 10, the left and right side portions 25, 25 of the abdominal side F and the left and right side portions 26, 26 of the abdominal side R are opposed to each other and joined by the side seal portion 7 (see FIG. 1). In the pants-type disposable diaper 10 formed by joining, the surface formed by the edge of the waist opening 11 is translated in the height direction (Y direction), and functionally, the waist region 61, the iliac crest region 62, and the torso It can be divided into a peripheral region 63 and a thigh peripheral region 64 (see FIG. 1). The waist region 61, the iliac crest region 62, and the waist region 63 correspond to the abdominal side F and the back side R in the development plan view of FIG. 2, and the thigh periphery region 64 corresponds to the crotch C. . The iliac crest region 62 is located on the dorsal side corresponding to the ventral iliac crest region of the portion of the outer body 2 that covers the iliac crest of the wearer's body when the diaper 10 is worn. This is a region composed of the iliac crest region. 4 and 5, the iliac crest region 62 corresponds to a range including a portion extending from the upper anterior iliac spine 91 to the iliac crest 92 in the human body (see FIG. 4). More specifically, the iliac crest region 62 includes the body portion 97 where the iliac overhangs, and the waist line direction (X direction) passing through the iliac crest apex 92a is the upper boundary line, and the upper anterior iliac This corresponds to a range including a width 95 when a line around the waist passing through the barbs 91 is a lower boundary line (see FIG. 5). The waist region 61 is a region extending from the upper end of the iliac crest region 62 to the waist opening 11, and a region where a waist elastic member is arranged at an edge near the waist opening 11 and a region where no waist elastic member is arranged including.

  Between the inner layer sheet 21 and the outer layer sheet 22 of the exterior body 2, the absorbent main body passes through the iliac crest region 62 from a position (waist region 61) above the iliac crest region on both the left and right sides of the abdominal side F. 3 and the front elastic members 81 and 82 arranged along the longitudinal direction of the absorbent main body 3 and the left and right sides of the back side R to the absorbent main body 3 and along the longitudinal direction of the absorbent main body 3 A plurality of (three in the figure) rear elastic members 83 and 84 are sandwiched and fixed in an extended state. And in the side edge 25 of the ventral side F and the side edge 26 of the back side R, the ends 81a and 82a of the front elastic members 81 and 82 and the ends 83a and 84a of the rear elastic members 83 and 84 Are joined by the side seal portion 7 so as to be opposed to each other. Further, the front elastic members 81 and 82 and the rear elastic members 83 and 84 in the crotch C are along the longitudinal direction of the absorbent main body 3 at positions outside the side edges of the central absorbent body 31 in the absorbent main body 3. It has a part to be arranged.

  In the present invention, “the articulation of the front elastic member and the rear elastic member” widely includes an arrangement in which the front elastic member and the rear elastic member are functionally interlocked so as to pull up the central absorber 31. It is not limited to the arrangement that overlaps or intersects indirectly via the inner layer sheet 21 in the side seam portion 7 as in the form, for example, substantially the same height without touching in the height direction (Y direction) of the side seam portion 7 And an arrangement that is directly joined at other than the side seam portion 7. The “part disposed along the longitudinal direction” refers to a part disposed substantially parallel to the side edge of the absorbent main body 3, for example, even if there is a curved portion that meanders in the middle. This means that the entire arrangement is substantially parallel to the longitudinal direction of the absorbent main body 3. In addition, the front elastic member and the second half elastic member may be directly joined, or one continuous elastic member may be used.

This point will be described with reference to the development view of FIG. In the left part of the ventral side F toward the development view of FIG. 2, the start point 71 in the waist region 61 passes through the iliac crest region 62 and reaches the lateral region 37 of the same left absorbent body 3. A front elastic member 81 is disposed. On the other hand, in the left portion of the dorsal side portion R, it goes down from the starting point 73 in the waist region 61 of the side portion 26 and passes through the iliac crest region 62 to reach the side region 37 of the same left absorbent body 3. A rear elastic member 83 is provided. Then, when the side edge 25 of the ventral side F and the side edge 26 of the back side R are joined by the side seal part 7, the end 81 a of the front elastic member 81 and the end 83 a of the rear elastic member 83 are Are joined substantially oppositely in the side seal portion 7. Similarly, on the right side in the development view of FIG. 2, from the front elastic member 82 that extends from the starting point 72 of the ventral side F through the iliac crest region 62 to the absorbent main body 3, and from the starting point 74 of the dorsal side R. A rear elastic member 84 that reaches the absorbent main body 3 through the iliac crest region 62 is disposed, and the end portion 82a of the front elastic member 82 and the end portion 84a of the rear elastic member 84 are side seal portions 7. Are substantially opposed to each other.
In the side region 37 of the absorbent main body 3, the crotch side ends of the front elastic member 81 and the rear elastic member 83 intersect and are connected at the crotch part C closer to the abdominal side part F than the center line CL of the diaper. (Hereinafter referred to as the intersection 87). Similarly, the crotch side ends of the front elastic member 82 and the rear elastic member 84 are connected or crossed at a crotch portion C closer to the abdominal side F than the center line CL of the diaper (hereinafter referred to as a crossing portion 87). .) Further, the front elastic members 81 and 82 have a length m ₁ along the longitudinal direction of the absorbent main body 3 in the side region 37, and the rear elastic members 83 and 84 have a length of the absorbent main body 3 in the side region 37. having a length m ₂ along the direction. In this way, the annular elastic band 90 that connects from above the iliac crest region 62 to the absorbent main body 3 is formed on each of the left and right sides of the diaper 10 (see FIG. 6).

Since this annular elastic band 90 supports the side region 37 of the absorbent main body 3 in the longitudinal direction, it is pulled up while the shape of the central absorbent body 31 is maintained when the diaper 10 is attached. Thereby, it becomes difficult to produce a clearance gap between the center absorber 31 and a body, the center absorber 31 fits firmly to a wearer's inseam, and the side leakage prevention effect of a liquid increases. In particular, since the rear elastic members 83 and 84 support the crotch portion C from the front to the back side portion R in the longitudinal direction, the fit of the wearer's buttocks is enhanced. Thereby, even if the wearer takes various postures such as lying on his back or turning over, the liquid leakage of the diaper can be effectively suppressed. In addition, since the annular elastic band 90 acts to push up the stretchable free end 41 of the leak-proof cuff on the skin contact surface side, the free end 41 easily fits the wearer's body and leaks by the pocket p. The effect can also be improved. Moreover, the force of the hand which pulls up the diaper is easily transmitted to the annular elastic band 90 by the side seal portion 7, and the annular elastic band 90 supports the side region 37 of the absorbent main body 3 in the crotch C in the longitudinal direction by the force. Can be raised in the form of As a result, curling of the absorbent main body 3 on the inner side of the thigh is suppressed, and the central absorbent body 31 inside the absorbent main body 3 is easily brought into contact with the crotch, so that mounting operability (e.g. ease of handling) is improved. improves.
Furthermore, after the diaper 10 is mounted, the annular elastic band 90 acts to lift the absorbent main body 3 of the crotch C, with the iliac crest region 62, particularly the portion 97 where the iliac protrudes, as a support. . Thereby, the diaper slip-off can be effectively prevented regardless of the amount of excrement and the weight of the urine collecting pad.
The action of the above diaper 10 is achieved not by the diaper tightening the wearer's body but by lifting with an elastic member utilizing the wearer's body shape. Therefore, in the diaper 10 of this embodiment, the discomfort due to tightening can be reduced at the same time.

  Since the front elastic members 81 and 82 that become the annular elastic band 90 pass around the lower abdomen above the wearer's vagina (see FIG. 6 (a)), the mobility of the legs around the vagina and the like is high. Not limited. Further, as described above, the effect of preventing the side leakage of the liquid is improved by the annular elastic band 90. Therefore, the mounting pressure by the leg elastic member 53 on the outer side in the width direction is reduced, and the mobility of the wearer's legs is further increased. It can also be increased. As described above, the two elastic elastic bands 90 formed by the front elastic member 81 and the rear elastic member 83 and the front elastic member 82 and the rear elastic member 84 prevent slippage, prevent side leakage of liquid, and mounting operability. And the mobility of the wearer's legs are improved, and a good wearing feeling of the whole diaper is obtained.

Next, with reference to FIG. 6, the action mechanism by arranging the front elastic members 81 and 82 and the rear elastic members 83 and 84 in the diaper 10 so as to pass through the iliac crest region 62 will be described. FIG. 6 is an explanatory view schematically showing the state of the wearer wearing the pant-type diaper of the present embodiment, (a) is a front view thereof, and (b) is a left side view. The shape of the body is schematically shown in order to explain the modeled outline and the position of the body.
First, this type of absorbent article, represented by ordinary disposable diapers, increases its weight by absorbing excrement such as urine in the absorbent body, and its weight acts as a force in the crotch direction so that the entire diaper It becomes easy to move in the direction. In particular, adult diapers, the amount that is excreted much, force P ₁ acting on the crotch direction is much stronger than that of the infant. To strengthen the elastic member arranged waistline direction with respect to the force P ₁ to such crotch direction becomes stronger tightening force P ₃ of the waist at the same time, tightness from the initial use by type of user to waist Sometimes it feels. If tightening of the elastic member in the waistline direction is strengthened, the vicinity of the waist opening may be shifted down to a portion where the waist opening is gradually narrowed by the tightening pressure and the abdomen becomes thinner. . In particular, when an infant or an elderly person with a large stomach is worn, it is not preferable to strengthen the tightening in the vicinity of the waist opening with respect to the swelling of the stomach, which may cause a slippage and increase.

On the other hand, the pant-type diaper 10 of this embodiment is arranged such that the front elastic members 81 and 82 and the rear elastic members 83 and 84 pass through the iliac crest regions 62 and 62, so that two annular elastic bands 90 are provided. , 90 are formed. In this arrangement, the annular elastic band 90 is fixed by being caught by the iliac crest 92 of the body portion 97 where the iliac protrudes. Such forms a large amount of excretion in the diaper is made even force is applied P ₁ in the crotch direction as described above, the annular elastic band 90 is caught by the iliac crest 92 (particularly portion 97 that projects iliac) Fixed. Then, in the crotch portion C generates a force P ₂ pulling the side areas 37 of the absorbent body 3 upward by the elastic force of the front elastic members 81 and 82 and the rear elastic members 83 and 84. Force P ₂ pulling the side areas 37 of the absorbent body 3 upward since the tightening force P ₃ of the waist is an independent force, without giving tightness to waist, Ya slipping of the total diaper Generation | occurrence | production of the clearance gap between a body and the absorptive main body 3 is suppressed. From the viewpoint of making the action of suppressing the slippage of the whole diaper and the generation of the gap between the body and the absorbent main body 3 more effective, the starting points 71 and 72 of the front elastic members 81 and 82 are used as the waist elastic members in the waist region 61. It is more preferable that the waist elastic member be disposed apart from the waist elastic member in a region where no elastic band is disposed because the tightening force in the vicinity of the waist opening by the waist elastic member and the force for pulling up the absorbent main body 3 become independent forces.

In particular, the crotch part C of the diaper 10 is easily deformed in a complicated manner by a force inward in the width direction from the wearer's thigh or a force in the front-rear direction. The diaper 10 can fit the center absorbent body 31 to the wearer's body sufficiently corresponding to such force. This point will be described with reference to FIG.
FIG. 7 is an explanatory view schematically showing a crotch portion of the diaper 10 from a slightly diagonally left side on the back side. In order to understand the operation of the present invention, a part of the outer package 2, the central absorber 31, and the annular elastic band 90 (the front elastic member 81 and the rear elastic member 83) are schematically shown, and other members are omitted. In FIG. 7, it showed typically and partially as a saddle face having a transverse main curvature surface 25 and a longitudinal main curvature surface 26 which are shapes when the diaper 10 is worn. If the transverse main curvature surface 25 is a convex surface having a center of curvature radius in the negative (D) direction, the longitudinal main curvature surface 26 is regarded as a concave surface having a center of positive (U) curvature radius. be able to. In FIG. 7, an end edge 11 (a skirt) that forms a suspension opening for the right foot and the left foot is formed. The direction connecting the end portion 11 (the skirt around) has transverse principal curvature surface 25, typically about to become large curvature of the transverse principal curvature surface 25 takes the force of the arrow f ₁ in the crotch portion, the diaper in the opposite There is a longitudinal main curvature 26 in the direction connecting the front and rear ends of the _two . Typically, a force indicated by an arrow f2 is applied to the crotch portion, and a contradictory force is applied to reduce the curvature of the longitudinal main curvature 26. Due to the contradictory force action of the arrows f ₁ and f ₂ , the central absorbent body 31 tends to move away from the body at the crotch part C or the back side in the vicinity of the buttocks, resulting in a gap between the diaper 10 and the body. easy.

On the other hand, in the diaper 10, the annular elastic band 90 acts to pull up the side of the central absorbent body 31 from the upper iliac crest region 62 side. For example, in the annular elastic band 90 on the left side of the diaper 10, the rear elastic member 83 is disposed in the longitudinal direction in the vicinity of the buttocks on the back side from the crotch, and the force acts in the arrow U direction. In the crotch portion by the action of this force, the central absorbent core 3 tries those Sesshiyo the crotch of the wearer pulled in the direction of the arrow V _1. That is, the force of the rear elastic member 83 tries to cancel the arrow f ₁ in the crotch surface shape. In the vicinity of the buttocks, the central absorbent core 3 tries those Sesshiyo the buttocks of the wearer acts in the direction of the arrow V _2. That is, the force of the rear elastic member 83 is to offset the arrow f ₂ in the crotch of the saddle surface shape. Similarly, the front elastic member 81 that is disposed lower abdomen even force acts in the direction of arrow U, the central absorbent member 3 tries those Sesshiyo the buttocks of the wearer acts in the direction of arrow V _3. As described above, due to the action of the rear elastic member 83 and the front elastic member 81 in the annular elastic band 90, the lateral region 37 of the absorbent main body 3 approaches the body, and the gap is eliminated. It becomes easy to fit the side edge of the body. This can also have the same effect on the rear elastic member 84 and the front elastic member 82 on the right side of the diaper 10. Thereby, the liquid leakage in the crotch and the back side of the diaper 10 can be suppressed effectively.

In wearing of the diaper 10 by the force P ₂ of the front elastic members 81 and 82 and the rear elastic members 83 and 84 pulls the central absorbent body 31 upward, the side edge outward in the longitudinal direction of the crotch of the central absorbent body 31 It is lifted as it is supported by. Thereby, the central absorbent body 31 is brought into close contact with the body without rubbing against the wearer's thighs, and the diaper can be easily lifted. Therefore, the pants-type diaper 10 of the present embodiment can easily fit the body at the side of the absorbent body when worn, and force P _{1 in the} crotch direction due to the excreted liquid without tightening the wearer's waistline strongly. In addition, it has an excellent effect of being able to realize good followability to the body and prevention of leakage.

  In the present embodiment, three front elastic members 81 and 82 and three rear elastic members 83 and 84 are arranged, respectively, but the number of the elastic members increases the degree of the lifting and fitting of the absorber and the tightening to the wearer. It can be decided as appropriate. The pull-up strength of the front elastic members 81 and 82 and the rear elastic members 83 and 84 is adjusted as a contraction force determined by the setting of the elastic member material, thickness, arrangement interval, and expansion ratio of the elastic member. be able to.

  As materials for the front elastic members 81 and 82 and the rear elastic members 83 and 84, normal elastic materials used for absorbent articles can be used. Examples of materials include styrene-butadiene, butadiene, isoprene, and neoprene. Synthetic rubber, natural rubber, EVA, stretchable polyolefin, polyurethane, etc., and the form is a thread-like or string-like shape (flat rubber, etc.) having a rectangular, square, circular, or polygonal cross section, or A multifilament type filament or the like can be used.

  As the expansion ratio of the front elastic members 81 and 82 and the rear elastic members 83 and 84, it is arranged in the absorbent article in a state of being expanded to 1.2 to 2.4 times the natural state (non-extended state), The pulling strength is sufficiently obtained, the shrinkage is moderate, the appearance is good, and it is easy to wear, and it is particularly preferable to arrange it at 1.4 to 1.8 times from the same viewpoint. In addition, the contraction force of the elastic member is 0.05% when stretched by 20% from the viewpoint of preventing the diaper from slipping out even if the amount of excrement and the weight of the urine pad are added, and fitting the absorbent main body with the body. It is preferable that it is -1.0N, and 0.1-1.5N is especially preferable. In addition, "20% extension" means extending | stretching 1.2 times from a non-expanded state here.

The expansion ratio of the elastic member is measured as follows. The pants-type diaper is developed and stretched, and in this state, the length (L1) of the elastic member is measured. The measurement of L1 may be obtained from image analysis by taking it as image data, or the length of the string may be measured along a string that does not stretch along the elastic member. Thereafter, the elastic member is taken out from the pants-type diaper, and the length (L0) of the elastic member in the natural state is measured. From these L1 and L0, the expansion magnification is calculated by the following formula 1.
Elongation magnification = L1 / L0 (Formula 1)

  The contraction force of the elastic member is measured as follows. A sample is prepared by cutting out the entire sheet holding and fixing the elastic member into a substantially strip shape. When a plurality of elastic members are arranged, the sample is cut out so that all elastic members are included. The sample in the natural state is attached to the tensile tester with the distance between the chucks (L0) taking into account the length of the sample in the natural state. Thereafter, the sample is stretched at a pulling speed of 300 mm / min, and when the distance between chucks becomes L0 × 1.2, the force applied to the sample is measured to obtain a contraction force.

  As described above, such expansion ratio and contraction force can be set as appropriate according to the material, thickness, and arrangement interval of the elastic member. From the viewpoint of the expression of contraction force and ease of handling, a multi-layer made of polyurethane material is used. It is preferable to use filamentous filaments. The thickness is preferably 620 to 1880 dtex, particularly preferably 940 to 1240 dtex. In this case, the number of front elastic members 81 and 82 and the number of rear elastic members 83 and 84 is preferably 2 to 5, and the interval is preferably 2 to 10 mm.

The contraction force of the front elastic members 81 and 82 and the rear elastic members 83 and 84 may be set to be the same within the above-mentioned range or may be set differently, but the rear elastic members 83 and 84 may be set differently. The length (m ₂ ) along the longitudinal direction of the absorbent main body 3 at the crotch part C is longer than the length (m ₁ ) along the longitudinal direction of the absorbent main body 3 at the crotch part C (82). m ₁ and m ₂ will be described later), the rear elastic members 83 and 84 extend from the abdominal side of the crotch C to improve the fit of the absorbent main body 3 in the crotch C to the body, From the viewpoint of prevention, it is typically desirable that the contraction force of the rear elastic members 83 and 84 is higher than the contraction force of the front elastic members 81 and 82. On the other hand, the contraction force of the front elastic members 81 and 82 and the rear elastic members 83 and 84 may be changed depending on the characteristics of the user, the usage scene, etc. For example, for men, the contraction force of the front elastic member is stronger. If it is for women, the contraction force of the rear elastic member may be made stronger.

In order for the annular elastic band 90 to effectively pull up the crotch absorber using the overhang of the iliac crest region 62, the start points 71 and 72 of the front elastic members 81 and 82 are the length of the side seal portion 7 in the height direction. The waist opening 11 is preferably in the range of 10 to 45%, particularly 15 to 40%. Similarly, the starting points 73 and 74 of the rear elastic members 83 and 84 are in the range of 10 to 45%, particularly 15 to 40%, from the waist opening 11 with respect to the length of the side seal portion 7 in the height direction. Is preferred.
The front elastic members 81 and 82 extend along the longitudinal direction of the absorbent main body 3 at the crotch portion C so that the annular elastic band 90 effectively supports the side portion of the crotch portion C while maintaining the shape of the central absorbent body 31. The length (m ₁ ) is preferably 0.10 to 0.35 as a ratio (m ₁ / m ₀ ) to the entire length (m ₀ ) of the absorbent main body 3, and further 0.18 to 0.32 preferable. The length (m ₂ ) along the longitudinal direction of the absorbent main body 3 with the rear elastic members 83 and 84 at the crotch C is a ratio (m ₂ / m ₀ ) to the total length (m ₀ ) of the absorbent main body 3. ) Is preferably 0.17 to 0.65, more preferably 0.30 to 0.58. Similarly, the distance (m ₃ ) between the center of the intersection 87 where the front elastic member and the rear elastic member intersect at the crotch part C and the longitudinal center line CL of the absorbent main body 3 is the whole of the absorbent main body 3. The ratio (m ₃ / m ₀ ) to the length (m ₀ ) is preferably 0.05 to 0.25, more preferably 0.10 to 0.20.

  Next, with respect to the disposable diaper 20 as the second embodiment of the present invention, differences from the first embodiment will be mainly described with reference to FIG. FIG. 8 is a developed plan view schematically showing a disposable diaper as the second embodiment.

  In 2nd Embodiment, as shown in FIG. 8, the absorber in the absorptive main body 3 is distribute | arranged in the width direction, and is located in the center absorber 31 located in the center in planar view, and its side. It is divided into side absorbers 34 and 34. In the present embodiment, the front elastic members 81 and 82 and the rear elastic members 83 and 84 are arranged on the side portion of the central absorbent body 33 and on the non-skin contact surface side of the side absorbent bodies 34 and 34. Has been. By doing in this way, the side part absorbers 34 and 34 are pushed up by the front side elastic members 81 and 82 and the rear side elastic members 83 and 84, and become a shape which stands | starts up at the body side. Therefore, the side absorbent bodies 34 and 34 having a liquid absorption holding function exist even in the pocket p formed by the stretchable free end 41 of the leak-proof cuff fitted to the wearer's body. Leakage prevention effect is further enhanced. In particular, when a urine collection pad or the like is used in the diaper 10, the side absorbent body can absorb and retain the overflowed liquid without being absorbed and retained by the urine collection pad. Increased further.

  The surface sheet 32 in the present embodiment is preferably a hydrophilic thermal bond nonwoven fabric from the viewpoint of promptly absorbing the excreted body fluid and transmitting it to the absorbent body and from the viewpoint of good touch, and particularly preferably an air-through nonwoven fabric. The top sheet 31 is preferably a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, and the fiber is a fiber that has undergone a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples. Hydrophilic agents include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used.

  The back sheet 33 is not particularly limited as long as it has waterproofness and moisture permeability. For example, a hydrophobic thermoplastic resin, a fine inorganic filler made of calcium carbonate, or an incompatible organic polymer, etc. And a porous film obtained by uniaxially or biaxially stretching the film. Examples of the thermoplastic resin include polyolefin. Examples of the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination.

  As materials of the outer layer sheet 22 and the inner layer sheet 21 in the outer package 2, those generally used for this type of article can be suitably used. Examples of the outer layer sheet 22 include non-woven fabrics, woven fabrics, knitted fabrics, resin films, and the like produced by various manufacturing methods such as air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric. The sheet material etc. which can be used can be used. The inner layer sheet 21 can also use the same sheet material as the outer layer sheet 22. Moreover, the outer layer sheet | seat 22 and the inner layer sheet | seat 21 may be comprised by the sheet | seat material in which any one or both has a stretching property. Examples of the stretchable sheet include a sheet in which a stretchable film is sandwiched between two sheet materials, and a nonwoven fabric composed of stretchable elastomer fibers such as polyurethane. In any case, it is preferable that the outer package 2 composed of the outer layer sheet 22 and the inner layer sheet 21 has liquid impermeability from the viewpoint of leakage prevention, and more preferably has air permeability and water vapor permeability. It is preferable for preventing an excessive increase in humidity in the diaper 10. The inner layer sheet 21 may be a single sheet or a combination of a plurality of sheets.

  The central absorbent 31 is a mixture of fluff pulp and superabsorbent polymer particles, or a mixture of fluff pulp, superabsorbent polymer particles and thermoplastic synthetic fiber, or a superabsorbent between a plurality of fiber sheets. It is a water-absorbent sheet sandwiched with polymer particles, and is compressed to a required thickness. The core may be entirely covered with a liquid-permeable sheet such as a tissue paper or a hydrophilic fiber nonwoven fabric in order to prevent the core from losing its shape or dropping off the polymer particles. As the polymer particles, starch-based, cellulose-based or synthetic polymer-based particles can be used.

  As materials of the elastic members other than the front elastic members 81 and 82 and the rear elastic members 83 and 84 such as the waist elastic member and the waist elastic member, the same as the front elastic members 81 and 82 and the rear elastic members 83 and 84 A normal elastic material used for the absorbent article can be used, and they may be the same as the front elastic members 81 and 82 and the rear elastic members 83 and 84, or may be different materials and thicknesses.

  The absorbent article of the present invention may be a baby diaper in addition to the adult pants-type disposable diaper of the above-described embodiment, and the absorbent article has a pant-type structure such as a sanitary short or a shorts napkin. It is a concept including general. In addition to the topsheet 31 and the exterior body 2, members may be appropriately incorporated in accordance with applications and functions.

2 Exterior body 3 Absorbent body 31 Central absorbent body 34 Side absorbent body 7 Side seal part 53 Leg elastic members 81, 82 Front elastic members 83, 84 Rear elastic members 10, 20 Pants-type disposable diaper 62 Iliac crest region

Claims (6)

An exterior body and an absorbent main body having a central absorbent body disposed in the center in the width direction on the skin surface side, and are divided into abdominal side part, crotch part and back side part in the longitudinal direction; The pants-type absorbent article in which the side edges of the part are joined together to form a pair of side seal parts, a waist opening and a pair of leg openings,
Between the waist opening and leg opening on the ventral side, there is an iliac crest region that covers the wearer's iliac crest when worn,
From the side edge of the abdominal side or the periphery of the iliac crest region above the iliac crest region through the iliac crest region to the crotch, and from the side edge of the back side or the periphery thereof A rear elastic member that reaches the crotch, and the side edge portions of the abdominal side portion and the back side portion are joined by the side seal portion so that the front elastic member and the rear elastic member are connected to each other. Has been
The front elastic member and the rear elastic member in the crotch part are pant-type absorbent articles that are disposed along the longitudinal direction outside the side edge of the central absorbent body.   The pants-type absorbent article according to claim 1, wherein the rear elastic member extends closer to the abdomen side of the crotch part.   A region where a central absorbent body is not disposed on both sides of the absorbent main body in the crotch part, the front elastic member and the rear elastic member overlap with the absorbent main body in plan view, and the central absorbent body The pants-type absorbent article according to claim 1 or 2, wherein the are arranged so as not to overlap each other in plan view.   The underpants type absorbent article according to any one of claims 1 to 3, wherein both side edges of the absorbent main body rise to the skin contact surface side when the pants type absorbent article is worn.   The pants-type absorbent article according to any one of claims 1 to 4, wherein the absorbent main body has a side absorbent body that is disposed at least partially apart from both sides of the central absorbent body in the width direction. .   The pants-type absorbent article according to claim 5, wherein the rear elastic member overlaps the side part absorber in a plan view.

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