JP6732375B2 - Sanitary shorts - Google Patents

Description

The present invention relates to sanitary shorts.

In various bottom garments worn to cover the wearer's buttocks, the tightening force is applied for the purpose of imparting a shaping function of the buttocks and preventing displacement of absorbent articles such as incontinence pads and sanitary napkins. It has been devised such as partially providing a raised area. For example, Patent Document 1 describes that the stretchability in the length direction of the buttocks region, which is the back body part of the waistline of the sanitary shorts and encloses the bulge of the buttocks, is higher than that of the lower abdomen region of the front body part. Has been done. According to this document, the sanitary shorts are prevented from slipping off, have good fit and support, and are comfortable to wear and have a stable wearing feeling.

In Patent Document 2, a main body portion that covers the buttocks and a strip-shaped first tightening area and a second tightening area that are respectively arranged in a pair of left and right main body portions and that have a stronger tightening force than the tightening force of the main body portion. The bottom garment provided is described. In this bottom garment, the first tightening region extends longitudinally from the upper part of the main body part to the buttocks on the rear center side of the apex of the buttocks, and the second tightening region is below the apex of the buttocks. On the side, it covers at least the upper side of the buttocks, and rises from the lower end of the first tightening region toward the upper side of the armpit. Patent Document 3 discloses a body portion that covers the buttocks, a waist-tightening region that is joined to the body portion in the shape of a strip that extends along the upper edge of the body portion on the rear side of the body portion, and the lower buttocks and buttocks. A bottom garment that has a U-shape that covers the side part and that has two upper ends connected to the waist tightening region, an outer side edge connected to the body part, and an inner side edge that is not connected to the body part, buttocks tightening region. Is listed. According to the bottom garment described in Patent Document 2, the buttock shaping function for relatively elderly people is enhanced, which is described in the document. In addition, according to the bottom garment described in Patent Document 3, it is described in the document that the wearing feeling is improved and the compensation force is increased.

JP, 2011-50683, A JP 2012-072523A JP 2012-102419 A

However, the clothes described in each of the above-mentioned patent documents have an insufficient balance between the fit property in the crotch part and the retention property of the absorbent article, or the fit property and the absorbent article corresponding to the change in the posture of the wearer. In some cases, the balance with the retention property was not sufficient.

Therefore, an object of the present invention is to improve sanitary shorts, and more specifically to provide a sanitary shorts having a further improved fit and retention of absorbent articles.

The present invention has a front body, a back body, and a crotch portion, and a vertical direction between the front body and the back body, which is a direction extending through the crotch portion, and a lateral direction orthogonal thereto. And a sanitary shorts in which the absorbent article is used by being attached to the crotch part,
The back body has a tightening region having a relatively higher tightening force than other regions in the back body, and the tightening region is a gluteal cleft, a gluteal groove and a buttocks at a position lower than the buttocks rear collision point. Make a shape that continuously covers the side part,
At the opening end of the leg opening, a ring-shaped leg stretch region is formed along the opening end,
At least a part of the leg stretch region provides sanitary shorts in which at least a part of the leg stretch region is continuous with at least a part of the tightening region.

The present invention also includes the above sanitary shorts,
A sanitary short and an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable or hardly-permeable back sheet, and an absorbent article having a liquid-retaining absorber interposed between the sheets. It provides a combination with.

Since the sanitary shorts of the present invention are excellent in wearing comfort and have a good fit between the absorbent article attached to the sanitary shorts and the wearer's body, the absorbent article is less likely to be displaced from the proper attachment position.

FIG. 1 is a perspective view of an embodiment of the sanitary shorts of the present invention viewed from the front body side. FIG. 2 is a perspective view of the sanitary shorts shown in FIG. 1 as viewed from the rear body side. FIG. 3 is a development view of the sanitary shorts shown in FIG. 1 as opened from the boundary between the front body and the back body and viewed from the skin-facing surface side. FIG. 4 is an enlarged view of the crotch portion in the development view shown in FIG. FIG. 5 is an enlarged view (corresponding to FIG. 4) of the crotch portion in the development view shown in FIG. FIG. 6 is a schematic diagram showing a method for evaluating the degree of damage to the skin by the surface sheet of the absorbent article. FIG. 7: is a top view which shows typically an example of the absorbent article used together with the sanitary shorts of this invention.

Hereinafter, the sanitary shorts (hereinafter, also simply referred to as “shorts”) of the present invention will be described based on its preferred embodiments with reference to the drawings. As shown in FIGS. 1 to 3, the shorts 1 of the present embodiment has a front body 2, a back body 3, and a crotch portion 4. In the shorts 1, an absorbent article (not shown) is attached to the crotch part 4 for use. In the present embodiment, a direction connecting the front body 2 and the back body 3 via the crotch portion 4 is called a vertical direction X, and a direction orthogonal to the direction is called a width direction Y. Therefore, the front body 2 and the back body 3 extend from the crotch portion 4 in the opposite directions along the vertical direction X. The shorts 1 also have a waist opening 5 and a pair of leg openings 6 and 6. The open end of the waist opening 5 is located above the wearer's hip bone, specifically, above the iliac crest in the wearing state of the shorts 1. The open ends of the leg openings 6 and 6 are located near the base of the thigh of the wearer, that is, near the groin when the shorts 1 are worn.

The waist opening 5 of the shorts 1 is formed with an annular waist stretch region 51 along the opening end at the opening end thereof. The waist elastic region 51 is in the shape of an annular band having a predetermined width, and has elasticity along its circumferential direction. Further, each leg opening 6 of the shorts 1 is formed with an annular leg expansion/contraction region 61 along the opening end at the opening end thereof. The leg stretchable region 61 is in the shape of an annular band having a predetermined width, and has stretchability along the circumferential direction.

The shorts 1 are preferably formed by cutting a tubular knitted fabric manufactured by a circular knitting machine into pieces each having a length corresponding to one piece of the shorts 1 and forming a cut piece of knitted fabric and a crotch portion 4. It is manufactured by stitching with another material. Therefore, the front body 2 and the back body 3 of the shorts 1 are formed from one continuous knitted fabric (fabric). That is, in the tubular waist portion 7 between the waist opening 51 and the pair of leg openings 6 and 6 in the shorts 1, the knitted fabric forming the front body 2 and the knitted fabric forming the back body 3 are continuous. The knitted fabric is formed of a common knitted fabric, and no joint portion is formed in the circumferential direction of the waistline portion 7 by joining the knitted fabrics by stitching or the like. That is, the waistline portion 7 has a so-called seamless integral structure. However, the waist elastic region 51 and the leg elastic region 61 described above are made of a material different from the material of the waistline portion 7. The waist stretchable region 51, the leg stretchable region 61, and the waistline portion 7 are joined at the joined portions 8a and 8b by a joining means such as stitching.

In the front body 2 of the shorts 1, the front body body 2a excluding the waist opening 5 and the leg openings 6 is composed of a single knitted structure. The front body 2a has elasticity in any direction of the XY plane including the vertical direction X and the width direction Y. In order to impart such stretchability to the front body portion 2a, for example, a knitting structure that exhibits stretchability may be adopted, or a thread having stretchability may be used.

On the other hand, in the rear body 3 of the shorts 1, the rear body main body portion 3a excluding the waist opening portion 5 and the leg opening portion 6 is composed of a plurality of knitting structures. Although the plurality of knitting structures are different from each other, they form one continuous knitted fabric, and there is no joint part such as a suture part between adjacent knitting structures. In the back body main body part 3a having a plurality of mutually different knitting structures, one of the knitting structures constitutes a tightening region 10 having a relatively higher tightening force than the other regions of the back body main body part 3a. There is. In the present specification, the tightening region means a region that exerts a large tightening force on the wearer's body when the shorts 1 are worn. The large tension force is represented by the magnitude of the stress σ when a certain constant strain ε is applied on the stress σ-strain ε curve. A large tightening force produces a large tightening force. The tightening force can also be evaluated by measuring the wearing pressure of the shorts 1.
In order to exert a large tightening force, for example, the following method can be adopted.
(1) A knitted fabric/fabric made of a knitted fabric having a large inclination E defined by Δσ/Δε and capable of giving a strain ε corresponding to the deformation of the body is used for the tightening portion.
(2) A knitted fabric/fabric that does not cope with deformation of the body and has a non-expandable state and a large stress σ is used for the tightening portion. That is, a knitted fabric/fabric having a deformation amount smaller than the deformation amount corresponding to the deformation of the body is used.

The pressure at the time of wearing the shorts 1, that is, the wearing pressure is measured by a wearing pressure measuring device (contact pressure measuring device (AMI3037-2) manufactured by AMI Techno Co., Ltd.). The specific measurement method is as follows.

[Pressure measurement method]
Using an air pack of φ=15 mm, the air pack is set so that the center of the air pack is located at a predetermined measuring portion, and the mounting pressure (P1) is measured. Then, the mounting pressure (P2) is measured by moving the center of the air pack by 15 mm along the longitudinal direction X of the shorts 1 or along the lateral direction Y. Similarly, 5 points are measured at 10 mm intervals, and the average value is used as the measured value. When the obtained measured value has a difference of ±20% or more with respect to the average value of the sample with little variation, the measured value is invalidated and additional measurement is performed.

The mounting pressure of the crotch part 4 of the shorts 1 measured by the above method is preferably 1.5 kPa or more, more preferably 2 kPa or more, and further preferably 2.5 kPa or more. The mounting pressure is preferably 4 kPa or less, more preferably 3.5 kPa or less, and even more preferably 3 kPa or less. The mounting pressure of the crotch portion 4 is preferably 1.5 kPa or more and 4 kPa or less, more preferably 2 kPa or more and 3.5 kPa or less, and further preferably 2.5 kPa or more and 3 kPa or less.

The mounting pressure of the front body 2 of the shorts 1 is preferably lower than the mounting pressure of the crotch portion 4. By setting the wearing pressure in this manner, the wearing feeling of the shorts 1 can be further enhanced without excessively tightening the abdomen of the wearer. From this viewpoint, the wearing pressure of the front body 2 of the shorts 1 is preferably 0.5 kPa or more, more preferably 1 kPa or more, provided that it is lower than the wearing pressure of the crotch portion 4. More preferably, it is 5 kPa or more. The mounting pressure is preferably 3 kPa or less, more preferably 2.5 kPa or less, and even more preferably 2 kPa or less. The mounting pressure on the front body 2 is preferably 0.5 kPa or more and 3 kPa or less, more preferably 1 kPa or more and 2.5 kPa or less, and even more preferably 1.5 kPa or more and 2 kPa or less.

The wearing pressure in the crotch portion 4 of the shorts 1 is at an intermediate position between the joint portion 8c on the front body 2 side and the joint portion 8c on the rear body 3 side of the crotch portion 4, and the joint portions 8d, 8d on both sides. The air pack is placed at an intermediate position between the two positions, P1 is measured, and P2 is measured with the position as a reference. The mounting pressure on the front body 2 of the shorts 1 is measured by measuring the P1 by arranging the air pack at the center of the body on the line connecting the right and left iliacs of the front body 2 and measuring P1. Measure P2.

As shown in FIG. 2 and FIG. 3, in the back body main body 3, the tightening region 10 is located on the lower side of the wearer's body than the buttocks rear projecting point P, that is, the position closer to the leg than the buttocks rear projecting point P. In, the gluteal cleft, the gluteal groove, and the buttocks armpits are continuously covered. That is, the tightening region 10 includes a gluteal cleft tightening region 11 that covers the gluteal cleft, a pair of gluteal groove tightening regions 12 that respectively covers a pair of gluteal grooves, and a pair of side arm tightening regions 13 that covers the buttocks side part. The posterior buttock point is the point of the buttock that protrudes most rearward when the human body is viewed from the side. Gluteal cleft is the part of the groove that runs vertically in the center of the left and right buttocks. The glutes are the wrinkles at the border between the buttocks and the legs. In the following description, for convenience, the gluteal cleft tightening region 11 is referred to as the first tightening region 11, the gluteal groove tightening region 12 is referred to as the second tightening region 12, and the armpit tightening region 13 is referred to. It is called the third tightening region 13.

In the worn state of the shorts 1, the first tightening region 11 extends along the gluteal cleft along the longitudinal direction X so as to cover the gluteal cleft of the wearer. The first tightening region 11 has a strip shape having a predetermined width. The lower end region of the first tightening region 11 is connected to the inward end region of each second tightening region 12. Each of the second tightening regions 12 extends outward in the lateral direction Y from the lower end region of the first tightening region 11 in the worn state of the shorts 1 and generally in the lateral direction along the buttocks. Each second tightening region 12 has a predetermined width and has a curved shape that is convex toward the lower side (that is, the wearer's leg side). An outer end region of each second tightening region 12 in the width direction Y is connected to each third tightening region 13. In the worn state of the shorts 1, each of the third tightening regions 13 extends from below to above so as to cover the buttocks side of the wearer and toward the boundary between the front body 2 and the back body 3. There is. Each third tightening region 13 is continuous with the second tightening region 12 and has a strip shape having a width substantially the same as the width of the second tightening region 12. As described above, since the waistline portion 7 of the shorts 1 has a seamless integrated structure, there is no clear boundary between the front body 2 and the back body 3, such as a suture line. Therefore, in the present specification, the boundary between the front body 2 and the back body 3 refers to the top of the wearer's top of the plane parallel to the line of sight of the wearer when the shorts 1 are worn from the side. The plane including the midline passing through the points is defined as the position across the shorts 1. The apex of the head is the highest point on the midline of the top of the human body.

As described above, in the back body 3 of the shorts 1, one tightening region 10 in which the first tightening region 11, the second tightening region 12 and the third tightening region 13 are continuous is formed. In addition to this, as shown in FIGS. 2 and 3, in the back body 3 of the shorts 1, at least a part of the leg stretchable region 61 of the second tightening region 12 which is a part of the tightening region 10 in the gluteal groove. At least part of it. As described above, the leg expansion/contraction region 61 is formed of a material different from that of the rear body main body 3a of the rear body 3, and is joined to the rear body main body 3a by the joint portion 8b. By this joining, at least a part of the leg elastic region 61 is continuous with at least a part of the second tightening region 12. Therefore, that at least a part of the leg elastic region 61 is continuous with at least a part of the second elastic region 12 means that no other region is interposed between the leg elastic region 61 and the second elastic region 12, It means that both areas are in direct contact with each other.

As shown in FIG. 3, it is preferable that the portion where the leg elastic region 61 and the second tightening region 12 are continuous is located below the buttocks rear projecting point P. That is, the second elastic region 12 and the leg expansion/contraction region 61 are connected to each other at approximately the center of each of the left and right leg expansion/contraction regions 61 in the rear body 3. On the other hand, on both end sides of the leg elastic region 61, the leg elastic region 61 is not continuous with the second elastic region 12, and another region is interposed between the leg elastic region 61 and the second elastic region 12. ing.

According to the shorts 1 of the present embodiment having the above configuration, the tightening region 10 is tightened so as to wrap around the buttocks of the wearer, so that even if the wearer's posture changes, the absorbent article maintains a high fit. Can be held in a proper wearing position. Moreover, since the tightening region 10 and the leg stretch region 61 are connected to each other in the gluteal groove, when the posture of the wearer changes and the tightening region 10 is pulled accordingly, the leg stretch region 61 is pulled by the pull. It is pulled together. As a result, the fit is further enhanced, and it becomes easier to hold the absorbent article in a proper wearing position.

As shown in FIGS. 2 and 3, from the viewpoint of further tightening the tightening action of the tightening region 10 so as to wrap around the buttocks of the wearer, as shown in FIGS. 2 and 3, the first tightening that is a part of the tightening region 10 that covers the buttocks. It is preferable that the region 11 extends toward the waist elastic region 51, so that the first tightening region 11 is continuous with at least a part of the waist elastic region 51 at the upper part of the buttocks. By adopting this configuration, when the posture of the wearer changes and the tightening region 10 is pulled accordingly, the waist stretch region 51 is pulled in conjunction with the pull. As a result, the fit of the shorts 1 is further enhanced.

The tightening force and stretchability of the first tightening region 11, the second tightening region 12, and the third tightening region 13 may be the same or different. Moreover, you may have the site|part which has a partially different tension|tensile_strength in each tightening area|region.
For example, the first tightening region 11 has a stronger tightening force at a position closer to the leg than the buttocks rear projecting point P, and is located between the part closer to the waist than the buttocks rear projecting point P to the third tightening region 13. , It is possible to weaken the tension. Thereby, the fitting property by the first and second tightening regions 11 and 12 and the lifting property of the shorts 1 as a whole can be improved. Alternatively, the stretchability of the shorts fabric during the forward bending operation can be enhanced, and the shorts 1 can be prevented from slipping down and exposing the back.

The tightening region 10, the waist elastic region 51, and the leg elastic region 61 have a common function in a broad sense in that the tightening force is generated on the wearer's body when the shorts 1 are worn. However, the tightening region 10 and the expansion/contraction regions 51 and 61 are obviously different in the degree of tightening force. Specifically, the tightening region 10 is made of a material having a large value of Δσ/Δε which is the slope E in the stress σ-strain ε curve described above. That is, it is made of a material having a large elastic modulus. The above-mentioned material having a large tension is a material having a large value of Δσ/Δε under a low elongation amount, for example, an elongation of 10%. The tightening region 10 is required to have a large elastic modulus, and it is preferable that the tightening region 10 contracts to the original length or a length close to the original length when the force is released from the pulled state. In contrast, the stretchable regions 51 and 61 are made of a material in which the value of the gradient E in the stress σ-strain ε curve, Δσ/Δε, is smaller than that of the tightening region 10 when compared at the same elongation amount. It is configured. Therefore, it can be said that the elastic regions 51 and 61 have a smaller tightening force than the tightening region 10. In addition to this, each expansion/contraction region 51, 61 has a small stress when pulled before reaching a yield point or a break point, and when the force is released from the stretched state, the original length or a length close to the original length is obtained. It is desirable to shrink.

In the tightening region 10, the measurement of the stress σ-strain ε curve described above is performed along the longitudinal direction X or the lateral direction Y of the shorts 1. On the other hand, in each of the stretchable regions 51 and 61, the stretching is performed along the circumferential direction of these regions 51 and 61. The test piece used for measurement shall be selected appropriately according to the size that can be obtained. For example, in the case of shorts corresponding to M size for women, the test piece that can be obtained from each of the stretchable regions 51 and 61 can be about 15 mm in the vertical direction X and 100 mm or more in the horizontal direction Y (that is, the circumferential direction). In the case of a tensile test in the circumferential direction, a test piece sampled in the longitudinal direction of 15 mm and the circumferential direction of 100 mm is used to perform the measurement at a tensile speed of 100 mm/min and a chuck distance of 50 mm. In the case of a tensile test in the lateral direction Y, the longitudinal direction is 20 mm, and the lateral direction Y is a tensile rate of 100 mm/min using a test piece sampled in the lateral direction of 50 mm so that the evaluation target region is located between the chucks. The measurement is performed at a chuck distance of 20 mm.

In the tightening region 10, the stress σ at 10% elongation is preferably 0.2 N/20 mm or more, more preferably 0.25 N/20 mm or more, and further preferably 0.3 N/20 mm or more. preferable. Further, it is preferably 2.0 N/20 mm or less, more preferably 1.5 N/20 mm or less, and further preferably 1.0 N/20 mm or less. Specifically, the stress σ at 10% elongation is preferably 0.2 to 2.0 N/20 mm, more preferably 0.25 to 1.5 N/20 mm, and 0.3 to 1 More preferably, it is 0.0 N/20 mm.

On the other hand, in each of the expansion/contraction regions 51 and 61, the stress σ at 10% elongation is preferably 0.1 N/20 mm or more, more preferably 0.15 N/20 mm or more, and even more preferably 0.1. More preferably, it is 2 N/20 mm or more. Further, it is preferably 1.5 N/20 mm or less, more preferably 1.0 N/20 mm or less, and further preferably 0.7 N/20 mm or less. Specifically, the stress σ at 10% elongation is preferably 0.1 N/20 mm or more and 1.5 N/20 mm or less, and more preferably 0.15 N/20 mm or more and 1.0 N/20 mm or less. It is more preferably 0.2 N/20 mm or more and 0.7 N/20 mm or less.

In the body part 3a of the rear body, there is a difference in stretchability between the tightening region 10 and a region other than the tightening region 10, so that the tightening force caused by the tightening region 10 is effective for the buttocks of the wearer. It is preferable from the viewpoint of acting on. Specifically, it is preferable that the tightening region 10 has lower elasticity than the region other than the tightening region 10 in the back body main body 3a. Here, the “stretchability” is an index indicating how much the material stretches, and from this viewpoint, when the stress σ-strain ε curve of the tightening region 10 is measured under the above-mentioned conditions, a stress of 0.5 N is applied. The elongation in 5 is preferably 5% or more, more preferably 15% or more, and further preferably 25% or more, provided that the elongation is lower than the area other than the tightening area 10. Further, it is preferably 50% or less, more preferably 40% or less, and further preferably 30% or less. Specifically, the elongation value is preferably 5% or more and 50% or less, more preferably 15% or more and 40% or less, and 25% or more and 30% or less under a stress of 0.5N. More preferably,

On the other hand, in the region other than the tightening region 10 of the back body body portion 3a, the elongation under the stress of 0.5 N is preferably 20% or more, provided that the elongation is higher than that of the tightening region 10. % Or more, and more preferably 50% or more. Examples of the region other than the tightening region 10 include a low tightening region 15 described later.

As shown in FIGS. 2 and 3, in the back body main body 3a, the tightening region 10 preferably further includes a fourth tightening region 14 in addition to the above-described first to third tightening regions 11-13. The fourth tightening region 14 is composed of an upper tightening region extending outward in the lateral direction Y from the upper end region of the first tightening region 11. Specifically, the fourth tightening region 14 is arranged continuously with the waist elastic region 51 so as to extend along the direction in which the waist elastic region 51 extends. Thus, by configuring the tightening region 10 from the first to fourth tightening regions 11-14, it is possible to tighten so as to wrap almost the entire circumference of the buttocks, so even if the wearer's posture changes, It is possible to easily hold the absorbent article in a proper wearing position while maintaining a higher fit.

As described above, in the back body main body 3a, when the tightening region 10 is composed of the above-described first to fourth tightening regions 11-14, the back body main body 3a is surrounded by these tightening regions 11-14. A region 15 including the buttocks rear ridge is defined. This area 15 is preferably a low tightening area having a relatively lower tightening force than the tightening area 10. That is, the low tightening region 15 is arranged at a position including the buttocks rear projecting point, and it is preferable that the respective tightening regions 11-14 are arranged around the low tightening region 15. By providing the low tightening region 15, a difference occurs in the tightening force between the low tightening region 15 and each tightening region 11-14 located around the low tightening region 15, and each tightening region 11-14. The wrapping effect of the buttocks due to the above becomes more remarkable.

From the viewpoint of making the above-mentioned effect more remarkable, the degree of the tightening force of the low tightening region 15 is represented by the value of Δσ measured under the above-mentioned conditions, and the stress σ at 10% elongation is On the condition that the value of the stress σ is lower than that in the tightening region 10, it is preferably 0.1 N/20 mm or more, more preferably 0.15 N/20 mm or more, and 0.2 N/20 mm or more. More preferably, Further, it is preferably 1.5 N/20 mm or less, more preferably 1.0 N/20 mm or less, and further preferably 0.7 N/20 mm or less. Specifically, the value of the stress σ at 10% elongation in the low tightening region 15 is preferably 0.1 N/20 mm or more and 1.5 N/20 mm or less, and 0.15 N/20 mm or more and 1.0 N/20 mm. It is more preferably the following, and more preferably 0.2 N/20 mm or more and 0.7 N/20 mm or less. The value of the stress σ at 10% elongation is a value measured along the longitudinal direction X of the low tightening region 15.

In the embodiment shown in FIGS. 2 and 3, the tightening region 10 composed of the tightening regions 11-14 does not have a completely closed shape, but instead of this, the upper end region of the third tightening region 13 is formed. And the end region of the fourth tightening region 14 may be combined to form the tightening region 10 in a closed shape, and the low tightening region 15 may be arranged inside the tightening region 10.

As described above, the back body main body 3a is made of a knitted fabric, and the tightening regions 11-14 and the low tightening regions 15 that form a part of the back body main body 3a. Areas other than 10 can be formed by knitting structures such as flat knitting, rubber knitting, pearl knitting, float knitting, double ridge knitting, and single ridge knitting. The appearance of the knitted fabric is changed in the process of adjusting the texture such as elongation and hardness. At that time, in order to increase the tightening force of each tightening region 11-14, a thick count thread, a thread having a high elastic modulus, a large number of threads to be used, or the like is used. The method is adopted. On the other hand, in order to reduce the tightening force of the low tightening regions 15 other than the low tightening region 15 such as the low tightening region 15, a fine count thread or a thread having a low elastic modulus is used. Techniques such as reducing the number of threads are adopted. That is, the back body 3 is made of knitted fabric, the knitted fabric is made up of two or more regions having different knitting structures, and the tightening regions 11-14 are made up of one of the two or more regions.

The above is the configuration of the back body 3 of the shorts 1, but as for the front body 2, as described above, the front body body portion 2a is composed of a single knitted structure. The front body portion 2a is required to have elasticity, but high tension is not required. It is preferable that the front body main body portion 2a has elasticity and strain force that the low tightening region 15 of the rear body main body portion 3a has. Specifically, with respect to stretchability, the elongation under a stress of 0.5 N is preferably 20% or more, more preferably 30% or more, and further preferably 50% or more. Further, it is preferably 150% or less, more preferably 100% or less, and further preferably 80% or less. For example, the value of elongation is preferably 20% or more and 150% or less, more preferably 30% or more and 100% or less, and 50% or more and 80% or less under a stress of 0.5N. More preferable.

On the other hand, the tightening force of the front body 2a is represented by the value of Δσ measured under the conditions described above, and the stress σ at the time of 10% elongation is greater than that of the tightening region 10. On the condition that it is low, it is preferably 0.1 N/20 mm or more, more preferably 0.15 N/20 mm or more, and even more preferably 0.2 N/20 mm or more. Further, it is preferably 1.5 N/20 mm or less, more preferably 1.0 N/20 mm or less, and further preferably 0.7 N/20 mm or less. Specifically, the value of the stress σ at 10% elongation in the front body 2a is preferably 0.1 N/20 mm or more and 1.5 N/20 mm or less, and 0.15 N/20 mm or more and 1.0 N/ It is more preferably 20 mm or less, and further preferably 0.2 N/20 mm or more and 0.7 N/20 mm or less. The value of the stress σ at 10% elongation is a value measured along the longitudinal direction X of the front body part 2a.

In the shorts 1 of the present embodiment, a low tightening region 15 which is a part of the back body main body 3a is connected to the front body 2a at the boundary between the front body 2 and the back body 3. However, this does not mean that the low tightening region 15 and the front body part 2a always have the same tightening force and/or stretchability. The low tightening region 15 and the front body main body 2a may have the same or different tightening force. The same applies to stretchability.

Considering the forward bending and backward bending of the body, the amount of skin deformation from the buttocks to the back is greater than the amount of skin deformation on the ventral side. Therefore, the deformation amount of the back body needs to be larger than the deformation amount of the front body in the longitudinal direction. The ratio of (the amount of vertical extension of the front body part 2a)/(the amount of vertical extension of the low-tightening region 15 of the rear body part 3a) is required in order to express comfortable wearing without being accompanied by movement of the body. Is preferably 1.3/2.0 or more and 1.5/1.7 or less.

The ratio of (the amount of vertical extension of the front body part 2a)/(the amount of vertical extension of the low tightening region 15 of the rear body part 3a) is measured as follows. As with the other measurements mentioned above, it must be selected appropriately according to the dimensions available on the test piece. For example, in the case of shorts corresponding to M size for women, the test pieces that can be obtained from the low tightening region 15 in the front body main body 2a and the back body main body 3a are both 100 mm in the vertical direction X and 30 mm in the horizontal direction Y. Sampling is possible. In the case of a tensile test, a test piece sampled in a lengthwise direction of 100 mm and a widthwise direction of 20 mm is used to measure at a pulling speed of 100 mm/min and a chuck distance of 50 mm. The amount of elongation. The measurement is performed at 5 points, and the average value is used as the measured value. When the obtained measured value has a difference of ±20% or more with respect to the average value of the sample with little variation, the measured value is invalidated and additional measurement is performed.

The crotch portion 4 interposed between the front body 2 and the back body 3 is made of a material different from that of the front body 2 and the back body 3, and the front body 2 and the back body 3 are joined to each other at a joint portion 8c. Are joined by. The joint portion 8c is formed by, for example, stitching. The crotch part 4 can be formed of, for example, a knitted fabric. However, the present invention is not limited to this, and the crotch portion 4 may be made of woven cloth. In some cases, the crotch portion 4 may be waterproofed.

A part of the leg expansion/contraction region 61 described above is positioned adjacent to each side edge of the crotch portion 4 in the width direction Y. The crotch portion 4 and the leg expansion/contraction region 61 are joined by the joint portion 8d. The joint portion 8c is formed by, for example, stitching.

The crotch portion 4 preferably has elasticity. In this case, the entire area of the crotch portion 4 may have the same elasticity, or the elasticity of each portion of the crotch portion 4 may be different. For example, as shown in FIG. 4, when the crotch portion 4 is viewed in the width direction Y, the central area 4a in the width direction Y and the area adjacent to the central area 4a and outside the central area 4a in the width direction Y are provided. Elasticity may be different between the pair of side regions 4b, 4b located on one side.

In the worn state of the shorts 1, an absorbent article (not shown) is attached to the crotch portion 4. In order to improve the holding property of the absorbent article and prevent the absorbent article from being displaced during mounting, it is preferable to dispose a shape retaining piece in the crotch portion 4. One shape-retaining piece can be arranged, for example, on the vertical center line that divides the crotch portion 4 into left and right. Alternatively, a pair of crotch parts can be arranged with a vertical center line that divides the crotch part into left and right. It is preferable that the shape-retaining piece is, for example, a plate-like body having a thickness that does not cause discomfort during mounting and having a certain degree of rigidity. As such a plate-shaped body, for example, a plurality of non-woven fabrics are laminated and each non-woven fabric is joined and integrated in a discontinuous joining pattern, and at least one of the non-woven fabrics is heat-fusible. A non-woven fabric in which the intersections of the constituent fibers are joined by the composite fibers can be used. The shape-retaining piece preferably has a vertically long shape whose length is larger than its width, and the length-retaining piece is preferably arranged so as to match the lengthwise direction of the shorts 1.

The shape-retaining piece is preferably made of a material having a higher rigidity than the material forming the crotch portion 4. By arranging the shape-retaining piece in the crotch part 4, the rigidity (stiffness) of the crotch part 4 is increased, and the shorts 1 are fixed to the shorts 1 even if the wearer makes a vigorous movement while wearing the shorts 1 to which the absorbent article is fixed. The absorbent article thus produced is less likely to be twisted or displaced. As a result, liquid leakage is less likely to occur. Further, since the crotch portion 4 to which the absorbent article is fixed is provided with rigidity, for example, when fixing the absorbent article having the wing portion to the shorts 1, the fastening adhesive applied to the wing portion may be It is effectively prevented from clinging to the hand or sticking to a position other than the proper position of the shorts, so that the wing part can be folded back and fastened to the crotch part 4 easily.

4 and 5 show an example of the arrangement of the shape retaining pieces 20 in the crotch portion 4. In FIG. 4, each shape-retaining piece 20 is arranged in the central area 4 a of the crotch portion 4. Each shape-retaining piece has an arcuate curved shape along the left and right side edges 4a', 4a' of the central region 4a. In FIG. 5, each shape retaining piece 20 is arranged on the joint portion 8 d so as to straddle the side region 4 b of the crotch portion 4 and the leg stretch region 61. Each shape retaining piece 20 extends along the vertical direction X.

In the embodiment shown in FIGS. 4 and 5, the shape-retaining pieces 20 can be arranged between the cloths when the crotch portion 4 is formed by stacking a plurality of cloths. Alternatively, it may be arranged on the surface of the crotch portion 4, that is, on the wearer's skin-facing surface or non-skin-facing surface.

As the absorbent article attached to the crotch portion 4, one capable of absorbing and retaining excreted body fluid can be used without particular limitation. Examples of such absorbent articles include incontinence pads used for absorbing urine, and sanitary napkins and panty liners used for absorbing menstrual blood and vaginal discharge. These absorbent articles are generally located on the skin-facing surface side of the wearer and have a liquid-permeable surface sheet, and are located on the non-skin-facing surface side, and are liquid-impermeable or hardly-permeable backsheet. , And a liquid-retaining absorber interposed between both sheets. A liquid-permeable sheet called a second sheet may be arranged between the topsheet and the absorber. The absorbent body may include a water-absorbing polymer which is a hydrogel material capable of absorbing and retaining water. In addition to the water-absorbent polymer, the absorber may contain an absorbent or swellable hydrophilic fiber material such as pulp, rayon, or polyvinyl alcohol, or a thermoplastic fiber such as polyethylene, polypropylene, or polyethylene terephthalate.
The topsheet and the backsheet each have a peripheral edge joint portion in which at least a part of the portion extending from the peripheral edge of the absorber is joined to each other in the peripheral edge portion of the absorbent article.

The absorbent article generally has an elongated shape having a longitudinal direction and a width direction orthogonal to the longitudinal direction. On the skin-facing surface of the absorbent article, a pair of leak-proof cuffs extending in the longitudinal direction can be arranged on both sides in the width direction. The leak-proof cuff has a propensity to stand up and thereby prevents leakage of menstrual blood excreted on the skin-facing surface.

The absorber in the absorbent article has, for example, an absorbent core containing the above-described water-absorbent polymer, and a cover sheet that covers the absorbent core. The covering sheet can be made of a liquid-permeable fiber sheet such as tissue paper or non-woven fabric. As the top sheet and back sheet of the absorbent article, the same materials as those conventionally used for this type of article can be used without particular limitation. For example, as the surface sheet, a liquid-permeable sheet such as a nonwoven fabric or a perforated film can be used. As the back sheet, for example, a liquid-impermeable film or a liquid-impermeable sheet such as spunbond/meltblown/spunbond laminated nonwoven fabric can be used. A liquid impermeable film may be provided with a plurality of fine pores to impart water vapor permeability to the film.

As described above, the shorts 1 of the present embodiment are tightened so that the tightening region 10 wraps around the buttocks of the wearer, so that even if the wearer's posture changes, the absorbent article maintains a high fit. Can be held in a proper wearing position. Therefore, the worn absorbent article receives pressure from the tightening region 10. In order not to impair the water absorbency of the absorbent article due to receiving pressure, it is advantageous to use, as the water-absorbent polymer contained in the absorber, one in which gel blocking does not easily occur under pressure. .. From this viewpoint, the water-absorbent polymer preferably has a liquid passage rate under pressure of 2.0 kPa of 50 ml/min or more, more preferably 60 ml/min or more. Further, it is preferably 200 ml/min or less, more preferably 150 ml/min or less. The liquid passing rate under pressure is preferably 50 ml/min or more and 200 ml/min or less, and more preferably 60 ml/min or more and 150 ml/min or less. The applied pressure of 2.0 kPa substantially corresponds to the pressure applied to the absorbent body through the tightening region 10 when wearing the absorbent article.

The liquid passing rate under pressure is measured by using the measuring method and the measuring device described in JP-A-2003-235889. Specifically, the liquid passage rate under pressure at 2.0 kPa is measured by the following procedure. These measurements are performed at 23±2° C. and 50±5% relative humidity, and the sample is stored in the same environment for 24 hours or more before the measurement.

[Measurement method of liquid flow rate under pressure]
In a 100 mL glass beaker, an amount of physiological saline (0.9% by mass sodium chloride solution) sufficient to swell 0.32±0.005 g of the water-absorbent polymer as a measurement sample, for example, the saturated absorption amount of the water-absorbent polymer. Soak in physiological saline more than 5 times and leave for 30 minutes.
Separately, at the lower end of the opening of a vertically standing cylinder (inner diameter 25.4 mm), a wire mesh (opening 150 μm, bio column sintered stainless steel filter 30SUS sold by Sansho Co., Ltd.) and a thin tube with a cock (inner diameter 2 mm) A filtration cylindrical tube having an inner diameter of 4 mm and a length of 8 cm) is prepared, and the entire contents of the beaker including the swollen measurement sample are put into the cylindrical tube with the cock closed. Then, a cylindrical rod having a diameter of 2 mm and having a wire mesh having an opening of 150 μm and a diameter of 25 mm at the tip was inserted into the filtration cylindrical tube so that the wire mesh and the measurement sample were in contact with each other, and the measurement sample was 2.0 kPa. Place the weight so that the load of is applied. After leaving for 1 minute in this state, the cock is opened to allow the liquid to flow, and the time until the liquid level in the filtration cylindrical tube reaches from the 60 mL scale line to the 40 mL scale line (that is, 20 mL of liquid passes) (T ₁ ) (Seconds). Using the measured time T ₁ (seconds), the liquid passage rate at 2.0 kPa is calculated from the following equation. In the formula, T ₀ (second) is a value obtained by measuring the time required for 20 ml of physiological saline to pass through the wire net without putting the measurement sample in the filtration cylindrical tube.
Flow rate (ml/min)=20×60/(T ₁ −T ₀ ).
The value obtained by the above formula is divided by the thickness of the swollen water-absorbent polymer layer in the cylinder, and converted into a value per 20 mm to obtain the liquid passage rate under pressure. The measurement was performed 5 times (n=5), the values at the upper and lower points were deleted, and the average value of the remaining 3 points was taken as the measured value.
A more detailed method of measuring the liquid passage rate is described in paragraphs 0008 and 0009 of JP2003-235889A. The measuring device is described in FIGS. 1 and 2 of the publication.

From the same viewpoint that it is preferable to set the liquid passing rate under pressure to the above range, the water-absorbent polymer preferably has an absorption amount under pressure of 2.0 gPa of 25 g/g or more, and 30 g/g. It is more preferable that the above is satisfied. Further, it is preferably 60 g/g or less, and more preferably 55 g/g or less. The amount of absorption under pressure is preferably 25 g/g or more and 60 g/g or less, and more preferably 30 g/g or more and 55 g/g or less. The amount of absorption under pressure is a measure of how much the water-absorbent polymer can absorb at the maximum when a pressure is applied to the absorbent body by wearing the absorbent article.

The absorption amount under pressure is measured by using the measuring method and the measuring device described in JP-A-2003-235889. The measurement is performed in the following environment in the environment of 25±2° C. and relative humidity of 50%±5%.
That is, 0.10 g of the sample was weighed into a cylindrical plastic tube (inner diameter 30 mm, height 60 mm) having a nylon mesh (JIS Z8801-1:2000) with an opening of 63 μm attached on the bottom surface, and the cylindrical plastic tube was placed vertically to make nylon. A sample is arranged on a mesh so that the sample has a substantially uniform thickness, and a weight having an outer diameter of 29.5 mm and a thickness of 22 mm is inserted into a cylindrical plastic tube so that a pressure of 2.0 kPa is applied to the sample. The mass of the cylindrical plastic tube and the weight are measured in advance.
Then, a cylindrical plastic tube containing the sample and the weight is vertically immersed in a petri dish (diameter: 120 mm) containing 60 ml of physiological saline with the nylon net side facing down. At this time, the cylindrical plastic tube is immersed to the depth of the bottom of the dish.
After 60 minutes, the cylindrical plastic tube containing the sample and the weight is pulled out from the water and the mass is measured, and the mass of the cylindrical plastic tube and the weight measured in advance is subtracted to calculate the mass of the physiological saline solution absorbed by the sample. .. The value obtained by multiplying the mass of the absorbed physiological saline solution by 10 is defined as the absorption amount under pressure (g/g).

From the same viewpoint that it is preferable to set the liquid passing rate under pressure and the absorption amount under pressure respectively within the above ranges, the water-absorbent polymer has a water absorption rate of 30 seconds or less by the vortex method (VORTEX method). It is preferably 25 seconds or less, and more preferably 25 seconds or less. The water absorption rate is preferably 5 seconds or more. The water absorption rate by the vortex method is preferably 5 seconds or more and 30 seconds or less, and more preferably 5 seconds or more and 25 seconds or less. The vortex method is known as a method of showing a liquid immobilizing ability when a water-absorbing polymer is forced to be exposed to a liquid.

The water absorption rate by the vortex method is measured by the method described below. That is, in a 100 mL glass beaker, 50 mL of physiological saline solution (0.9% by mass sodium chloride solution) and a magnetic stirrer chip (diameter of central part: 8 mm, diameter of both ends: 7 mm, length of 30 mm, surface coated with fluororesin) The beaker is placed on a magnetic stirrer (HPS-100 manufactured by AS ONE). The rotation speed of the magnetic stirrer is adjusted to 600±60 rpm, and the physiological saline is stirred. 2.0 g of a water-absorbent polymer, which is a measurement sample, was introduced into the liquid at the center of the vortex of saline solution under stirring, and the water-absorption rate (second) of the water-absorbent polymer was measured in accordance with JIS K 7224 (1996). taking measurement. Specifically, start the stopwatch when the addition of the water-absorbent polymer to the beaker is completed, and stop when the stirrer chip is covered with the test liquid (when the vortex disappears and the liquid surface becomes flat). Stop the watch and record the time in seconds as water absorption rate by vortex method. The measurement was performed by measuring n=5, deleting the values at the upper and lower one points, and taking the average value of the remaining three points as the measured value. Note that these measurements are performed at 23±2° C. and a relative humidity of 50±5%, and the samples are stored in the same environment for 24 hours or more before the measurement.

In the shorts 1 of the present embodiment, the tightening region 10 tightens the buttocks of the wearer. Therefore, if the absorbent article worn on the shorts 1 is excessively thick, discomfort may occur. Further, if the absorbent article is excessively thick, it may crack the outerwear in its mounted state. From these viewpoints, the thickness of the absorber in the absorbent article is preferably 1 mm or more and 4 mm or less, more preferably 1.5 mm or more and 3 mm or less. In particular, when the absorbent article is used as an incontinence pad, the thickness of the absorbent body is preferably 0.5 mm or more and 4 mm or less, more preferably 1 mm or more and 3 mm.

The thickness of the absorber is measured under a condition that a weight of 5 cm×5 cm is placed on the absorber and a weight of 0.245 kPa is applied. As the measuring device, for example, an LK080 class 2 laser displacement meter manufactured by Keyence Corporation can be used. The number of measurement points is the average of 5 points. If the measured value is 20% or more, the data is deleted and another measured value is added. The sample is preliminarily subjected to a load of 24.5 kPa for 12 hours so that the wrinkles are extended.

In relation to the thickness of the absorbent body, the basis weight of the absorbent body is 35 g/m ² or more when the absorbent article is used as an incontinence pad. It is preferably 500 g/m ² or less, and particularly preferably 50 g/m ² or more and 400 g/m ² or less.

Although it depends on the thickness of the absorber, it is preferable that the absorber has relatively low bending rigidity. Due to the low bending rigidity of the absorber, when the tightening region 10 of the shorts 1 tightens the buttocks of the wearer, the tightening force is effectively transmitted to the absorber so that the absorber follows the shape of the wearer's body. And will be deformed smoothly. From this point of view, the flexural rigidity value of the absorber is preferably 50 g or less, and more preferably 40 g or less. The flexural rigidity value is preferably 10 g or more. The flexural rigidity value of the absorber is preferably 10 g or more and 50 g or less, and more preferably 10 g or more and 40 g or less. This flexural rigidity value is a value when bent so that a folding line is formed along the width direction of the absorber.

The flexural rigidity value of the absorber can be measured by a steering wheel odometer. The method of measurement by the handle-o-meter conforms to Japanese Industrial Standards "JIS L-1096 (General woven fabric test method)". A square absorbent body cut into a length of 100 mm in the longitudinal direction of the absorbent article and 100 mm in the width direction of the absorbent article is placed on a support table having a groove with a width of 30 mm. , Are arranged so as to be parallel to the extending direction of the groove. The center of the absorber is pushed by a blade having a thickness of 2 mm, and the resistance value (g) when the absorber is pushed in 8 mm is measured by a load cell. The average value of 3 points is used as the measured value. As the measuring device, for example, a texture tester (handle-o-meter method) HOM-2 type manufactured by Daiei Kagaku Seiki Seisakusho Ltd. can be used.

In the shorts 1 of the present embodiment, since the tightening region 10 tightens the buttocks of the wearer, the friction resistance of the skin-facing surface of the absorbent article attached to the shorts 1 is reduced to reduce the wear of the skin-facing surface and the wearer. It is preferable to reduce the discomfort caused by rubbing against the skin. From this viewpoint, the average friction coefficient (MIU) of the skin-facing surface including the topsheet in the absorbent article is preferably 0.210 or less, more preferably 0.200 or less. The average friction coefficient is evaluated using a KES-SE surface friction feeling tester (manufactured by Kato Tech). Specifically, while the load of 5 kPa (50 gf/cm ² ) is applied by the friction element on the skin-facing surface of the absorbent article including the surface sheet, the friction element is moved at a speed of 20 mm/sec. , Average friction coefficient (unit: dimensionless, symbol; MIU) is measured. The value is taken as the average friction coefficient. The average coefficient of friction indicates the degree of smoothness of the surface, and the smaller the value, the smoother the surface. The coefficient of friction is measured with the topsheet incorporated in the absorbent article. The test piece is a test piece obtained by cutting out the absorbent portion of the absorbent article in which the absorber is present together with the topsheet and the backsheet. The friction coefficient is measured by applying a friction element to the surface of the topsheet that faces the wearer's skin.

Further, in the shorts 1 of the present embodiment, since the tightening region 10 tightens the buttocks of the wearer, it is preferable to increase the air permeability of the absorbent article attached to the shorts 1 and suppress the occurrence of stuffiness. From this point of view, the degree of air permeability of the absorbent article is represented by a ventilation resistance value (per 100 g/m ^{2 of} superabsorbent polymer) in a region in the thickness direction extending from the skin contact surface side of the absorbent article to the absorber. It is preferably 0.4 kPa·s/m or less, more preferably 0.3 kPa·s/m or less. The smaller the ventilation resistance value, the higher the air permeability. There is no particular lower limit to the ventilation resistance value, and the smaller the value, the higher the air permeability. The ventilation resistance value is measured by a ventilation tester KES-F8 (trade name) manufactured by Kato Tech. According to this device, the pressure loss when a constant flow rate of air (4 cc square cm/sec) is passed is measured. The measured ventilation resistance value is converted into a value per 100 g/m ^{2 of the} superabsorbent polymer.

Furthermore, from the viewpoint of suppressing the uncomfortable tightening caused by the tightening region 10 of the shorts 1, the entire absorbent body of the absorbent article has a compression work amount (WC value) of 0 in the thickness direction by the KES compression tester. is preferably .98cN · cm / cm ² or more, more preferably 1.47cN · cm / cm ² or more. This compression work is measured using a KES-G5 handy compression tester manufactured by Kato Tech. The measuring method is as follows. A 5 cm x 10 cm test piece is prepared and attached to a test stand. The test piece is compressed between steel plates having a circular flat surface with an area of 2 cm ² . The compression speed is 20 μm/sec. The maximum compression load is 4.9 kPa. The recovery process also measures at the same speed. The compression work WC is expressed by the following equation.

As described above, by controlling various physical properties of the absorbent article that is worn on the shorts 1, it is possible to effectively suppress the occurrence of discomfort while the absorbent article is worn, and to the skin. The damage of can be effectively reduced. The degree of damage to the skin can be evaluated by measuring TEWL (transepidermal water loss). Specifically, TEWL indicates the amount of water evaporated from the skin (g/m ² /hr), and it is generally said that the higher the value, the lower the skin barrier function. Therefore, the degree of damage to the skin before and after mounting the absorbent article is evaluated by the method described below. The value of ΔTEWL thus obtained is preferably 2.5 g/m ² /hr or less, more preferably 2.0 g/m ² /hr or less, and 1.5 g/m ² /hr. The following is more preferable. TEWL was measured using a multi-probe adapter MPA5 with Tewameter TM300 (both manufactured by Courage + Khazaka electric GmbH) attached, using an adult forearm inside the test site at 23.2°C and a humidity of 47% RH. Under the conditions of.

<Cleaning/acclimation>
Thoroughly rinse the inside of the forearm with a commercially available mild-type facial cleanser and rinse thoroughly with water. Lightly wipe the water of the washed part with Kim Towel (registered trademark) manufactured by Nippon Paper Crecia Co., Ltd. Then, it is acclimated for 15 minutes in an environment variable room at 25° C. and a humidity of 50% RH.
<Scraping treatment>
The surface sheet of the absorbent article is rubbed on the inner side of the adult forearm that has been washed and acclimated as described above. Specifically, a cylindrical weight 1 having a bottom diameter of 5 cm (load of 45 g/cm ² ) is used, and as shown in FIG. 6, the top sheet 2 of the absorbent article is attached to the bottom surface of the weight 1 and the outer surface thereof. Are attached so as to face downward, and the topsheet 2 is attached and fixed to the side surface of the weight 1 with the rubber 3. The topsheet 2 in this state is brought into contact with the inner side of the adult forearm, and under the state, the weight 1 is rotated around the axis in one direction by six rotations during one reciprocation of 10 cm with a finger. move. This operation is performed in an environment variable room at 25° C. and a humidity of 50% RH.
By subtracting the value of TEWL after rubbing from the value of TEWL before rubbing, the amount of change in TEWL (ΔTEWL=value of TEWL before rubbing by absorbent article-value of TEWL after rubbing) is obtained. For the measurement of TEWL, the average value of the three measured values is used as the measured value.

According to the shorts 1 of the present embodiment, by wearing the shorts 1, the incontinence symptom can be improved by tightening due to the tightening region 10 of the shorts 1. In this case, even if the incontinence symptom is improved, if the absorbent article worn on the shorts 1 gives a wet feeling, it may be difficult for the wearer to realize the improvement of incontinence. From this point of view, the absorbent article preferably has a liquid return amount of 0.5 g or less, more preferably 0.3 g or less, after absorbing the indicated absorption amount of water. The “displayed absorption amount” is a standard liquid absorption amount (volume or mass) of the absorbent article, which is displayed on a package or the like for packaging the absorbent article.

The liquid return amount is measured by the following method. The target absorbent article is spread in a plane and placed on a laboratory table, and an acrylic cylinder having a cylinder inner diameter of 22 mmφ and a cylinder height of 50 mm is positioned on the absorbent article injection opening of 10 mmφ on the absorbent article. The acrylic injection plate integrally molded is placed so that its injection hole is located at the center of the crotch part on the skin-facing surface (surface sheet side) of the absorbent article, and a suitable weight plate is placed on it. Adjust so that the load (including the liquid injection plate itself) is 5 g/m ² . Preliminarily acclimate the artificial urine at room temperature (23° C.) and measure it in the injection beaker according to the indicated absorption amount. This artificial urine was poured into the cylinder of the liquid injection plate at once, and 20 A of 4A filter paper made of Toyo Roshi Kaisha, Ltd. was stacked on the injection site (the center of the crotch part on the skin-facing surface of the absorbent article), and further on it. A load is applied for 10 minutes to absorb the artificial urine into the filter paper. The load is such that 6 kg is applied to an area of 30 cm×15 cm. After 10 minutes, the load is removed and the mass of the filter paper that has absorbed the artificial urine is measured. The mass of the filter paper before absorption is subtracted from this mass, and the mass of the artificial urine absorbed in the filter paper is calculated as the liquid return amount. The measurement is performed three times for each absorbent article, and the average value is used as the liquid return amount of the diaper.
As artificial urine to be absorbed by the absorbent article, known artificial urine can be used. For example, artificial urine having the composition described in paragraphs [0025], lines 11 to 16 of JP 2009-178411 A can be used. Artificial urine is urea 1.94% by mass, sodium chloride 0.795% by mass, magnesium sulfate 0.11% by mass, calcium chloride 0.062% by mass, potassium sulfate 0.197% by mass, red No. 2 (dye) 0. 0.010% by mass, 96.88% by mass of water and polyoxyethylene lauryl ether (about 0.07% by mass), and the surface tension was adjusted to 53±1 dyne/cm (23° C.).

From the same viewpoint as the liquid return amount described above, it is easy for the wearer of the absorbent article to feel the improvement of incontinence because the absorbent article has a high dry feeling even after absorbing the liquid. The dryness of the absorbent article can be evaluated by measuring the amount of heat transfer using a BT-Box (Bottom Temperature Box). BT-Box is well known in the art as a sensor used for measuring thermophysical properties. The BT-Box includes a hot plate that is a portion that contacts the measurement target. In addition, the BT-Box includes means for supplying heat to the hot plate, such as a heater, so that the hot plate can always be kept at a set temperature, and a sensor for detecting the temperature of the hot plate. ing. In the present invention, as the BT-Box, the one provided for THERMO LABO II (KES-F7), which is an accurate and rapid thermophysical property measuring device manufactured by Kato Tech, is used. The area of the hot plate in this BT-Box is 25 cm ² . 40 g of artificial urine is collectively injected into the central region of the skin-facing surface of the absorbent article, and 20 seconds after the start of injection, BT-Box is placed on the artificial urine injection part on the skin-facing surface of the absorbent article. When placed and the amount of heat transferred from the BT-Box to the absorbent article under a load of 1.0 kPa is measured with time, the maximum value of the measured amount of transferred heat is preferably 3 W or less. , 2.5 W or less is more preferable, and 2 W or less is more preferable. Details of the method of measuring the amount of heat using BT-Box are described in, for example, Japanese Patent Application Laid-Open No. 2009-178411.

In order to set the amount of liquid return and the amount of heat using BT-Box described above in the above range, for example, a water-absorbing polymer having the above-mentioned physical property values is used, or the thickness and bending rigidity value of the absorber are set to the above-mentioned values. It may be set in the range or by adjusting the blending ratio of the water-absorbent polymer constituting the absorber and the hydrophilic fiber.

In the shorts 1 of the present embodiment, the crotch portion 4 pushes up the pelvic floor of the wearer. Therefore, when the shorts 1 have an absorbent article attached, when the wearer operates with the absorbent article attached, The peripheral edge of the absorbent article may irritate the wearer's skin and cause a feeling of strangeness. Therefore, for the purpose of suppressing the occurrence of such discomfort, in the peripheral edge joint portions 91a and 92a formed at the front end portion 91 and/or the rear end portion 92 in the longitudinal direction X of the absorbent article 90 as shown in FIG. It is preferable to form non-joint portions 91b and 92b extending in the width direction at the tips (ends in the longitudinal direction) of the peripheral edge joint portions 91a and 92a. In the non-bonded portions 91b and 92b, the top sheet and the back sheet are in a non-bonded state. In particular, it is preferable that the non-bonded portions 91b and 92b have a length along the longitudinal direction X of 2 mm or more and 20 mm or less, and particularly 5 mm or more and 15 mm or less, from the viewpoint of effectively preventing the occurrence of discomfort. In order to maintain the shape of the absorbent article 90, the sheet material (for example, the top sheet or the back sheet) is joined to another sheet material or the like in the inner region from the peripheral edge portion to the central portion of the absorbent article. It is in a state. In this case, in the non-bonding portions 91b and 92b, the sheet material (for example, the top sheet or the back sheet) that constitutes the absorbent article 90 is in a non-bonding state with other sheet materials or the like.

For the same reason as above, in the front region 93 and/or the rear region 94 of the absorbent article 90, the side edges 93a, 94a connected to the front end portion 91 and/or the rear end portion 94 are also the side end portions. It is preferable to form a non-bonded portion (not shown) extending in the longitudinal direction at (the end in the width direction). In the non-bonded portion, the top sheet and the back sheet are in a non-bonded state, and the sheet material (for example, the top sheet or the back sheet) constituting the absorbent article 90 is not bonded to other sheet materials or the like. It is in a joined state. In particular, it is preferable that the non-bonded portion has a length along the lateral direction Y of 10 mm or more and 100 mm or less, and particularly 20 mm or more and 50 mm or less from the viewpoint of effectively preventing the occurrence of discomfort.

Further, for the same reason as above, it is preferable that the ratio of the length of the portion where the joint portion is formed in the peripheral portion of the absorbent article to the peripheral length of the absorbent article 90 be 90% or less, and 85% or less. Is more preferable, and it is more preferable that it is 80% or less. Further, the ratio is preferably 50% or more, more preferably 60% or more, and further preferably 65% or more. The ratio is preferably 50% or more and 90% or less, more preferably 60% or more and 85% or less, and even more preferably 65% or more and 80% or less.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above embodiments. For example, the shorts 1 of the above-described embodiment have a shape in which the opening end of the leg opening 6 is located near the base of the thigh of the wearer, but instead of this, the opening end of the leg opening 6 is replaced. May be positioned below the base of the wearer's thigh, so-called one-minute length.

Regarding the above-described embodiment, the present invention further discloses the following sanitary shorts.
<1>
A sanitary shorts having a longitudinal direction which is a direction extending between a front body and a back body via a crotch part, and a lateral direction orthogonal to the longitudinal direction, wherein the absorbent article is used by being attached to the crotch part. ,
The back body has a tightening region having a relatively higher tightening force than other regions in the back body, and the tightening region is a gluteal cleft, a gluteal groove and a buttocks at a position lower than the buttocks rear collision point. Make a shape that continuously covers the side part,
At the opening end of the leg opening, a ring-shaped leg stretch region is formed along the opening end,
Sanitary shorts in which at least a part of the leg elastic region is continuous with at least a part of the tightening region in the gluteal groove.

<2>
<1> wherein the back body is composed of a knitted fabric, the knitted fabric is composed of two or more regions having different knitting structures, and the tightening region is composed of one of the two or more regions. Sanitary shorts.
<3>
At the open end of the waist opening, an annular waist elastic region is formed along the open end,
A part of the tightening region covering the gluteal cleft extends toward the waist elastic region, whereby the part is continuous with at least a part of the waist elastic region at the upper part of the buttocks <1> or <. 2> Sanitary shorts.
<4>
The sanitary shorts according to any one of <1> to <3>, wherein the tightening region has lower elasticity than the region other than the tightening region in the back body.
<5>
The back body has a low tightening region having a relatively lower tightening force than the tightening region,
The sanitary shorts according to any one of <1> to <4>, wherein the low tightening region is arranged at a position including a buttocks rear protrusion point, and the tightening region is arranged around the low tightening region. ..
<6>
The tightening region, a gluteal tightening region extending longitudinally along the gluteal cleft,
A pair of gluteal groove tightening regions extending laterally outward from the lower end region of the gluteal cleft tightening region and along the gluteal groove,
The sanitary shorts according to any one of <1> to <5>, further comprising a pair of armpit tightening regions extending vertically upward from an end region of the buttocks tightening region.

<7>
The sanitary shorts according to <6>, wherein at least a part of the leg stretchable region is continuous with at least a part of the buttocks tightening region.
<8>
The sanitary shorts according to <6> or <7>, further including an upper tightening region that extends laterally outward from an upper end region of the gluteal cleft tightening region.
<9>
In the crotch portion, a pair of plate-shaped shape retaining pieces is arranged with a vertical center line that divides the crotch portion into left and right sides,
The shape-retaining piece is formed by stacking a plurality of nonwoven fabrics and joining and integrating the nonwoven fabrics in a discontinuous joining pattern, and at least one of the nonwoven fabrics is composed of a heat-fusible composite fiber. The sanitary shorts according to any one of <1> to <8>, which is made of a nonwoven fabric in which fiber intersections are joined.
<10>
Has a waist opening,
In the waist opening, at the opening end, an annular waist stretch region along the opening end is formed,
The sanitary shorts according to any one of <1> to <9>, wherein the waist elastic region has the shape of an annular band having a predetermined width, and has elasticity along the circumferential direction. ..
<11>
Has a waist opening,
The tubular waistline portion between the waist opening and the pair of leg openings is formed of a common knitted fabric in which the knitted fabric forming the front body and the knitted fabric forming the back body are continuous. The sanitary shorts according to any one of <1> to <10>.
<12>
Has a waist opening,
Having a tubular waistline between the waist opening and the pair of leg openings,
The sanitary shorts according to any one of the above items <1> to <11>, in which a joint portion in which knitted fabrics are joined by stitching or the like is not formed in the circumferential direction of the waistline portion.
<13>
Has a waist opening,
In the waist opening, at the opening end, an annular waist stretch region along the opening end is formed,
Having a tubular waistline between the waist opening and the pair of leg openings,
The waist elastic region and the leg elastic region are made of a cloth different from the cloth forming the waistline portion,
The sanitary shorts according to any one of <1> to <12>, wherein the waist stretch region, the leg stretch region, and the waistline portion are joined at a joining portion by joining means such as stitching.

<14>
Has a waist opening,
In the front body, the sanitary shorts according to any one of <1> to <13>, wherein the front body main body portion excluding the waist opening portion and the leg opening portion is composed of a single knitting structure.
<15>
Has a waist opening,
The rear body, the rear body main body portion excluding the waist opening and the leg opening is composed of a plurality of knitting structures,
Although the plurality of knitting structures are different from each other, they constitute one continuous knitted fabric, and there is no joint part such as a stitching part between adjacent knitting structures. > The sanitary shorts according to any one of <14>.
<16>
Has a waist opening,
The rear body, the rear body main body portion excluding the waist opening and the leg opening is composed of a plurality of knitting structures,
One of the knitting structures according to any one of <1> to <15>, which constitutes the tightening region having a relatively higher tightening force than other regions in the back body main body. Sanitary shorts.
<17>
The tightening region includes a first tightening region that covers the buttocks, a pair of second tightening regions that respectively covers the pair of gluteal grooves, and a pair of third tightening regions that covers the buttocks side part,
The sanitary shorts according to any one of <1> to <16>, wherein a portion where the leg stretch region and the second tightening region are continuous is located below the buttocks rear projecting point.
<18>
Has a waist opening,
In the waist opening, at the opening end, an annular waist stretch region along the opening end is formed,
In the waist elastic region and the leg elastic region, the stress σ at 10% elongation is preferably 0.1 N/20 mm or more, more preferably 0.15 N/20 mm or more, and 0 0.2 N/20 mm or more, more preferably 1.5 N/20 mm or less, still more preferably 1.0 N/20 mm or less, still more preferably 0.7 N/20 mm or less. Preferably
The stress σ at 10% elongation is preferably 0.1 N/20 mm or more and 1.5 N/20 mm or less, more preferably 0.15 N/20 mm or more and 1.0 N/20 mm or less, and 0.1. The sanitary shorts according to any one of <1> to <17>, more preferably 2 N/20 mm or more and 0.7 N/20 mm or less.
<19>
When the stress σ-strain ε curve of the tightening region is measured, the elongation under a stress of 0.5 N is preferably 5% or more on condition that it is lower than the region other than the tightening region, It is more preferably 15% or more, further preferably 25% or more, preferably 50% or less, more preferably 40% or less, further preferably 30% or less. ,
The elongation value is preferably 5% or more and 50% or less, more preferably 15% or more and 40% or less, and further preferably 25% or more and 30% or less under a stress of 0.5N. The sanitary shorts according to any one of <1> to <18>.

<20>
A region other than the tightening region in the back body main body preferably has an elongation under a stress of 0.5 N higher than that of the tightening region, preferably 20% or more, and 30% or more. Is more preferable and 50% or more is more preferable, and the sanitary shorts according to any one of <1> to <19>.
<21>
The tightening region includes a first tightening region that covers the buttocks, a pair of second tightening regions that respectively covers the pair of gluteal grooves, and a pair of third tightening regions that covers the buttocks side part,
The sanitary according to any one of <1> to <20>, wherein the tightening region further has a fourth tightening region that is an upper tightening region extending laterally outward from an upper end region of the first tightening region. shorts.
<22>
Has a waist opening,
In the waist opening, at the opening end, an annular waist stretch region along the opening end is formed,
The sanitary shorts according to <21>, wherein the fourth tightening region is arranged in series with the waist stretch region 51 so as to extend along the extending direction of the waist stretch region.
<23>
A region surrounded by the first to fourth tightening regions and including the buttocks rear projecting point is defined,
The region is a low tightening region having a relatively lower tightening force than the first to fourth tightening regions,
The low tightening region is preferably 0.1 N/20 mm or more, provided that the stress σ at 10% elongation is lower than the value of the stress σ in the first to fourth tightening regions. It is more preferably 15 N/20 mm or more, even more preferably 0.2 N/20 mm or more, and preferably 1.5 N/20 mm or less, more preferably 1.0 N/20 mm or less. Is more preferably 0.7 N/20 mm or less,
The value of the stress σ at 10% elongation in the low tightening region is preferably 0.1 N/20 mm or more and 1.5 N/20 mm or less, and 0.15 N/20 mm or more and 1.0 N/20 mm or less. The sanitary shorts according to <21> or <22>, more preferably 0.2 N/20 mm or more and 0.7 N/20 mm or less.
<24>
Has a waist opening,
In the waist opening, at the opening end, an annular waist stretch region along the opening end is formed,
The front body has a front body portion which is an area excluding the waist opening and the leg opening,
The front body portion has an elongation of preferably 20% or more, more preferably 30% or more, still more preferably 50% or more, and further preferably 150% under 0.5N stress. It is preferably not more than 100%, more preferably not more than 100%, further preferably not more than 80%,
The elongation value is preferably 20% or more and 150% or less, more preferably 30% or more and 100% or less, and further preferably 50% or more and 80% or less under a stress of 0.5N. The sanitary shorts according to any one of <1> to <23>.

<25>
Has a waist opening,
In the waist opening, at the opening end, an annular waist stretch region along the opening end is formed,
The front body has a front body portion which is an area excluding the waist opening and the leg opening,
The front body portion is preferably 0.1 N/20 mm or more, and 0.15 N/20 mm, provided that the stress σ at 10% elongation is lower than the stress σ value in the tightening region. More preferably, it is more preferably 0.2 N/20 mm or more, further preferably 1.5 N/20 mm or less, more preferably 1.0 N/20 mm or less, and 0.1. 7 N/20 mm or less is more preferable,
The value of stress σ at 10% elongation in the front body portion is preferably 0.1 N/20 mm or more and 1.5 N/20 mm or less, and 0.15 N/20 mm or more and 1.0 N/20 mm or less. Is more preferable and 0.2 N/20 mm or more and 0.7 N/20 mm or less is more preferable, and the sanitary shorts according to any one of <1> to <24>.
<26>
Has a waist opening,
In the waist opening, at the opening end, an annular waist stretch region along the opening end is formed,
The front body has a front body portion which is an area excluding the waist opening and the leg opening,
The rear body has a rear body main body which is an area excluding the waist opening and the leg opening,
The back body has a low tightening area having a relatively lower tightening force than the tightening area,
The ratio of (longitudinal extension of the front body portion)/(longitudinal extension of the low tightening region of the rear body portion) is 1.3/2.0 or more and 1.5/1.7 or less. The sanitary shorts according to any one of <1> to <25>.
<27>
The sanitary shorts according to any one of <1> to <26>,
A sanitary short and an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable or hardly-permeable back sheet, and an absorbent article having a liquid-retaining absorber interposed between the sheets. In combination with.
<28>
The top sheet and the back sheet, at least a part of the portion extending from the peripheral edge of the absorbent body, has a peripheral edge joint portion joined to each other in the peripheral edge portion of the absorbent article,
The sanitary shorts according to <27>, wherein a non-joint portion extending in the width direction is formed at a tip of the peripheral edge joint formed on the front end portion and/or the rear end portion in the longitudinal direction of the absorbent article. And absorbent article combination.

1 Sanitary Shorts 2 Front Body 2a Front Body Body 3 Back Body 3a Back Body Body 4 Crotch 4a Central Area 4a' Side Edge 4b of Central Area 4a Side Area 5 Waist Opening 51 Waist Expansion Area 6 Leg Opening 61 Leg expansion/contraction region 7 Girth parts 8a, 8b, 8c Joining part 10 Tightening region 11 First tightening region (glute cleft tightening region)
12 Second tightening area (gluteal groove tightening area)
13 Third tightening area (side tightening area)
14 Fourth tightening area (upper tightening area)
15 Low tightening area 20 Shape-retaining piece P Buttocks rear projecting point

Claims (9)

A front body, a back body, and a crotch portion, and a vertical direction which is a direction extending between the front body and the back body through the crotch portion, and a lateral direction orthogonal to the vertical direction, Absorbent article is a sanitary shorts used by being attached to the crotch part,
The crotch portion has elasticity,
The back body has a tightening region having a relatively higher tightening force than other regions in the back body, and the tightening region is a gluteal cleft, a gluteal groove and a buttocks at a position lower than the buttocks rear collision point. Make a shape that continuously covers the side part,
At the opening end of the leg opening, a ring-shaped leg stretch region is formed along the opening end,
At least a portion of the leg stretch region is continuous with at least a portion of the tightening region in the buttocks ,
In the crotch portion, a pair of plate-shaped shape retaining pieces is arranged with a vertical center line that divides the crotch portion into left and right sides,
The shape-retaining piece is formed by stacking a plurality of nonwoven fabrics and joining and integrating the nonwoven fabrics in a discontinuous joining pattern, and at least one of the nonwoven fabrics is composed of a heat-fusible composite fiber. Sanitary shorts made of non-woven fabric where the intersections of fibers are joined . The back body is made of a knitted fabric, the knitted fabric is made up of two or more regions having different knitting structures, and the tightening region is made up of one of the two or more regions. Sanitary shorts. At the open end of the waist opening, an annular waist elastic region is formed along the open end,
Of the tightening region, the part covering the gluteal cleft extends toward the waist stretch region,
3. The sanitary shorts according to claim 1 or 2, whereby the portion is connected to at least a part of the waist stretch region at the upper part of the buttocks. The sanitary shorts according to any one of claims 1 to 3, wherein the elastic region has a lower elasticity than the region other than the elastic region in the rear body. The back body has a low tightening region having a relatively lower tightening force than the tightening region,
The sanitary shorts according to any one of claims 1 to 4, wherein the low tightening region is arranged at a position including a buttocks rear protrusion point, and the tightening region is arranged around the low tightening region. The tightening region, a gluteal tightening region extending longitudinally along the gluteal cleft,
A pair of gluteal groove tightening regions extending laterally outward from the lower end region of the gluteal cleft tightening region and along the gluteal groove,
The sanitary shorts according to any one of claims 1 to 5, further comprising a pair of armpit tightening regions extending upward in the vertical direction from the end regions of the buttocks tightening region. A front body, a back body, and a crotch portion, and a vertical direction which is a direction extending between the front body and the back body through the crotch portion, and a lateral direction orthogonal to the vertical direction, Absorbent article is a sanitary shorts used by being attached to the crotch part,
The back body has a tightening region having a relatively higher tightening force than other regions in the back body, and the tightening region is a gluteal cleft, a gluteal groove and a buttocks at a position lower than the buttocks rear collision point. Make a shape that continuously covers the side part,
At the opening end of the leg opening, a ring-shaped leg stretch region is formed along the opening end,
At least a portion of the leg stretch region is continuous with at least a portion of the tightening region in the buttocks,
In the crotch portion, a pair of plate-shaped shape retaining pieces is arranged with a vertical center line that divides the crotch portion into left and right sides,
The shape-retaining piece is formed by stacking a plurality of nonwoven fabrics and joining and integrating the nonwoven fabrics in a discontinuous joining pattern, and at least one of the nonwoven fabrics is composed of a heat-fusible composite fiber. Sanitary shorts made of non-woven fabric where the intersections of fibers are joined. The sanitary shorts according to any one of claims 1 to 7 ,
A sanitary short and an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable or hardly-permeable back sheet, and an absorbent article having a liquid-retaining absorber interposed between the sheets. In combination with. The top sheet and the back sheet, at least a part of the portion extending from the peripheral edge of the absorbent body, has a peripheral edge joint portion joined to each other in the peripheral edge portion of the absorbent article,
The sanitary shorts according to claim 8 , wherein a non-joint portion extending in the width direction is formed at a tip end of the peripheral edge joint portion formed at a front end portion and/or a rear end portion in the longitudinal direction of the absorbent article. Combination with absorbent articles.

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