CN117500463A - Absorbent article - Google Patents

Abstract

Provided is an absorbent article which suppresses the displacement of a front waistline region toward the crotch region, suppresses wrinkling of the front waistline region, and is easy to continuously cover the abdomen. The absorbent article (1) is provided with: a front-rear direction (L) and a width direction (W) orthogonal to each other; a front waistline region (S1); a rear waistline region (S2); a crotch region (S3); a side joint (60) joining the front waistline region and the back waistline region; an absorbent core (21). A bending base point (71) for bending the front waistline region in the front-back direction is provided in the lower abdomen region (F15) and is positioned at a position which is separated from the front end edge of the front waistline region in the back direction by 50-80% of the total length of the front waistline region in the front-back direction. A length in a width direction in a natural state of a first region (F11) located on a waist opening side in a region formed by bisecting a bending base point and a front end edge of a front waistline region in a front-back direction is longer than a length in a width direction in a natural state of a second region (F12) located on a crotch lower side in the bisected region.

Description

Absorbent article

Technical Field

The present specification relates to an absorbent article of the pants type.

Background

As described in patent document 1, an absorbent article such as a pants-type disposable diaper is known. The absorbent article described in patent document 1 is intended to divide a waistline region disposed around the waist of a wearer into a plurality of regions, and dispose the waistline region so as to conform to the shape of the body by making the stress different for each region.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2017-525487

However, the conventional absorbent article has the following problems.

When the absorbent article is worn, particularly when the absorbent article is used for a long period of time, the front waistline region of the absorbent article may move to the crotch region side due to the upward and downward movements of the legs. More specifically, the deformation base point of the body when the leg moves up and down is made concave in the lower abdomen. When the wearer moves the legs up and down, the crotch region moves more easily than the lower abdomen depression, and the absorbent core moves more easily toward the crotch side in response to the movement of the legs. Further, even if the wearer moves the legs up and down with the absorbent core in the crotch region sandwiched between the legs, the absorbent core may be repeatedly moved in the front-rear direction. The crotch region of the absorbent article bulges or the front waistline region of the absorbent article excessively puckers due to movement of the absorbent core. As a result, the wearing aid such as a mother may have an impression of an absorbent article that is likely to shift during wearing, or an impression of an absorbent article that is unsuitable for long-term use.

In addition, if the waist size of the wearer with the abdomen bulge on the side of the waist opening is smaller than the lower abdomen dent, the waist opening is smaller than the waist opening, and the waist opening is smaller than the waist opening. Therefore, the abdomen bulge may not be continuously covered with the absorbent article.

Disclosure of Invention

Accordingly, there is a demand for an absorbent article which suppresses displacement toward the crotch region of the front waistline region, suppresses creasing of the front waistline region, and is easy to continuously cover the abdomen.

An absorbent article according to one embodiment includes: a front-rear direction and a width direction orthogonal to each other; a front waistline region; a rear waistline region; a crotch region disposed between the front waistline region and the back waistline region; a side joint portion joining the front waistline region and the back waistline region; and an absorbent core disposed at least in the crotch region. The bending base point at which the front waistline region is bent in the front-back direction is provided in a lower abdomen region located at a position that is separated from the front end edge of the front waistline region to the rear by 50 to 80% of the total length of the front waistline region in the front-back direction. The length in the width direction in a natural state of a first region located on the waist opening side in a region bisected in the front-rear direction between the folding base point and the front end edge of the front waistline region is longer than the length in the width direction in a natural state of a second region located on the crotch side in the bisected region.

Drawings

Fig. 1 is a schematic front view of an absorbent article according to the present embodiment.

Fig. 2 is a schematic plan view of the absorbent article according to the present embodiment.

Fig. 3 is a sectional view taken along the line A-A shown in fig. 2.

Fig. 4 is a view schematically showing a state in which an absorbent article is worn by a wearer.

Fig. 5 is a schematic side view of an absorbent article folded in half.

Detailed Description

(1) Summary of the embodiments

An absorbent article according to one embodiment includes: a front-rear direction and a width direction orthogonal to each other; a front waistline region; a rear waistline region; a crotch region disposed between the front waistline region and the back waistline region; a side joint portion joining the front waistline region and the back waistline region; and an absorbent core disposed at least in the crotch region. The bending base point at which the front waistline region is bent in the front-back direction is provided in a lower abdomen region located at a position that is separated from the front end edge of the front waistline region to the rear by 50 to 80% of the total length of the front waistline region in the front-back direction. The length in the width direction in a natural state of a first region located on the waist opening side in a region bisected in the front-rear direction between the folding base point and the front end edge of the front waistline region is longer than the length in the width direction in a natural state of a second region located on the crotch side in the bisected region. The lower abdomen area is disposed at a position apart from the front end edge of the front waistline area to the rear by 50-80% of the total length of the front waistline area in the front-back direction, and is disposed opposite to the depression of the lower abdomen. By providing the bending base point in the lower abdominal region, the deformation due to the movement of the leg can be cut off, and the entire front waistline region can be restrained from being displaced due to the deformation due to the movement of the leg. Further, the front waistline region is deformed at the bending base point, so that the front waistline region is fitted to the depression of the lower abdomen, and the waistline dimension of the front waistline region is longer than the bending base point toward the waist opening side, so that the entire front waistline region is shaped along the outer shape of the body. Therefore, wrinkling of the front waistline region is suppressed and continuous covering of the abdomen is easy. It is difficult to give the wearing aid the impression that the absorbent article is easily shifted during wearing, the impression that the absorbent article is unsuitable for long-term use, and a sense of security can be given even if it is used for a long period of time.

According to a preferred embodiment, the narrow portion having the shortest length in the width direction of the front waistline region is provided in the lower abdomen area in a natural state of the absorbent article. The waist size of the depression of the lower abdomen of the wearer is relatively short on the abdomen side. According to the present embodiment, since the narrow portion is disposed in the depression of the lower abdomen, the front waistline region becomes easier to follow the shape of the body.

According to a preferred embodiment, the narrow portion is disposed apart from the bending base point in the front-rear direction. According to the present embodiment, the narrow portion is separated from the bending base point, and thus, the narrow portion and the bending base point are independent of each other, and excessive follow-up between the narrow portion and the bending base point can be suppressed. Therefore, positional displacement of the narrow-width portion can be suppressed.

According to a preferred embodiment, the narrow portion is located on the waist opening side with respect to the bending base point. According to the present embodiment, the force can be cut off by the bending base point in the region on the crotch lower side than the narrow width portion. The narrow portion is difficult to follow the movement of the leg and the position thereof is difficult to shift, and therefore, even for a drastic movement, it is difficult to shift.

According to a preferred embodiment, the length in the width direction of the third region extending between the bending base point and the rear end edge of the front waistline region in the natural state is longer than the length in the width direction of the second region in the natural state. The third region is located on the crotch side from the depression of the lower abdomen and is disposed at the root of the leg. According to the present embodiment, by extending the length of the third region in the natural state, the tightening feeling around the leg can be reduced, and the vibration (force applied in the offset direction) at the time of the leg operation can be made difficult to be transmitted to the entire front waistline region.

According to a preferred embodiment, the third region has a third front region which is a region bisecting the third region in the front-rear direction and located on the waist opening side, and a third rear region which is a region bisecting the third region in the front-rear direction and located on the crotch side. The length in the width direction of the third front region in the natural state is shorter than the length in the width direction of the third rear region in the natural state. According to the present embodiment, the length in the width direction of the absorbent article gradually increases from the bending base point toward the crotch side. Therefore, it becomes difficult to interfere with the movement of the wearer's legs. The leg support can be configured so that the wearer (particularly, an infant) does not tighten around the abdomen and the legs, and the wearer's legs are easily moved but hardly offset.

According to a preferred embodiment, the bending base point is constituted by the front end edge of the absorbent core. According to the present embodiment, since the front end edge of the absorbent core constitutes the folding base point, the front waistline region is more easily deformed at the folding base point. Since the absorbent core is not present on the waist opening side of the bending base point, downward displacement of the absorbent core on the waist opening side of the depression of the lower abdomen can be suppressed, and concentration of the wrinkled absorbent core to the crotch region can be suppressed.

According to a preferred embodiment, a discontinuous elastic member is disposed between the pair of side joining portions so as to span the front waistline region. The number of the discontinuous elastic members on the waist opening side of the bending base point is smaller than the number of the discontinuous elastic members on the crotch side of the bending base point. According to the present embodiment, since the number of discontinuous elastic members on the waist opening side is smaller than the bending base point, it is possible to suppress wrinkles in the vicinity of the front end edge of the front waistline region and downward displacement of the entire front waistline region while ensuring the fitting property in the vicinity of the front end edge of the front waistline region.

According to a preferred embodiment, the front waistline region has a high-shrinkage region in which the shrinkage force in the width direction is highest, among regions in which the front waistline region is ten-equally divided in the front-back direction. The bending base point is arranged in the high shrinkage area. According to the present embodiment, by disposing the bending base point in the high-shrinkage region, the bending base point can be made to adhere to the depression of the lower abdomen portion, and the bending base point is made difficult to be displaced in the front-rear direction.

According to a preferred embodiment, when comparing the contraction force in the width direction of the region located on the waist opening side with respect to the high contraction region in the region where the front waistline region is divided into ten equal portions in the front-back direction, the contraction force of the region located on the waist opening side is lower than the contraction force of the region located on the crotch side. According to the present embodiment, the contraction force gradually becomes lower from the high contraction region toward the waist opening side. Thus, a stress arrangement can be made that particularly bulges in a body shape along the abdomen of the infant. Therefore, the front waistline region as a whole is more difficult to shift downward.

According to a preferred mode, a fold line for folding the absorbent article in half extends in the width direction in the crotch region. The length of the absorbent core in the front waistline region in the front-back direction is 1/2 or less of the entire region in the front-back direction with respect to the front waistline region. A first distance from the front end edge of the absorbent core to the front end edge of the front waistline region is longer than a second distance from the rear end edge of the absorbent core to the rear end edge of the rear waistline region. The difference between the distance from the fold line to the rear end edge of the absorbent core and the distance from the fold line to the front end edge of the absorbent core is shorter than the length of the absorbent core in the front-rear direction in the front waistline region. According to the present embodiment, the absorbent core is not present in at least half of the entire area in the front-rear direction of the front waistline region. In addition, the length of the absorbent core in the front waistline region is shorter than the length of the absorbent core in the rear waistline region. As a result, the soft region in the front waistline region is widened, and therefore, the absorbent core in the front waistline region is less susceptible to the movement of the legs, and the transfer of the absorbent core to the crotch side can be suppressed. In addition, a difference between a distance from the fold line to a rear end edge of the absorbent core and a distance from the fold line to a front end edge of the absorbent core is shorter than a length in a front-rear direction of the absorbent core in the front waistline region. Thus, in a state in which the absorbent article is folded along the folding line, the length of the absorbent core in the rear waistline region extending upward (back side) from the absorbent core in the front waistline region can be made relatively short. That is, the length of the absorbent core of the rear waistline region does not become extremely long with respect to the absorbent core of the front waistline region. Therefore, when the absorbent article is pulled up to the waist of the wearer by grasping the vicinity of the side joint portions, the upward pulling force can be transmitted to both the absorbent core of the rear waistline region and the absorbent core of the front waistline region. Therefore, the entire absorbent article can be disposed at an appropriate position covering the waist circumference.

(2) Overall outline structure of absorbent article

The absorbent article 1 according to the embodiment will be described with reference to fig. 1 to 5. The absorbent article 1 is, for example, a pants-type disposable diaper, a pants-type sanitary napkin, or the like. The absorbent article 1 of the embodiment is a pants-type disposable diaper. Fig. 1 is a schematic front view of an absorbent article according to the present embodiment. Fig. 2 is a schematic plan view of the absorbent article according to the present embodiment. Fig. 3 is a sectional view taken along the line A-A shown in fig. 2. In addition, the drawings are schematic, and it should be noted that the ratio of the respective dimensions and the like sometimes differ from actual ones. In the schematic cross-sectional view, for convenience of explanation, the respective members are sometimes separated in the thickness direction T, but in an actual product, are in contact in the thickness direction T. In the present invention, the outer side portion refers to a portion that includes an outer edge in the width direction W and occupies a certain range in the width direction W, and the outer edge refers to an outer edge in the width direction W. The inner side in the present invention means a portion that occupies a certain range in the width direction W including an inner edge in the width direction W, and the inner edge means an inner edge in the width direction W. In the present invention, the front end portion and the rear end portion are portions that occupy a certain range in the front-rear direction L including edges in the front-rear direction L, and the front end edge and the rear end edge are edges in the front-rear direction L. The outer end portion includes a front end portion and a rear end portion, and the outer end edge includes a front end edge and a rear end edge.

As shown in fig. 1, the absorbent article 1 has a front-rear direction L and a width direction W orthogonal to the front-rear direction L. The front-rear direction L is defined by the direction extending to the front side and the rear side of the body. In other words, the front-rear direction L is a direction extending in the front-rear direction in the unfolded absorbent article 1. As shown in fig. 3, the absorbent article 1 has a thickness direction T orthogonal to both the front-back direction L and the width direction W. The thickness direction T extends toward the skin surface side T1 facing the wearer side and the non-skin surface side T2 opposite to the skin surface side. The absorbent article 1 has a front waistline region S1, a back waistline region S2, and a crotch region S3. The front waistline region S1 is a region disposed on the front waistline (abdomen) of the wearer. The rear waistline region S2 is a region disposed on the back side of the wearer. The crotch region S3 is disposed between the front waistline region S1 and the back waistline region, and is a region disposed under the crotch of the wearer.

The absorbent article 1 has an absorbent main body 20 and an outer body 50. The absorbent main body 20 may be configured separately from the outer body 50. The absorbent main body 20 is disposed at least in the crotch region S3. The absorbent main body 20 may extend in the front-rear direction L from the crotch region S3 toward the front waistline region S1, or may extend in the front-rear direction L from the crotch region S3 toward the rear waistline region S2. The absorbent main body 20 may overlap the outer body 50 in the thickness direction T in the front waistline region S1 and the back waistline region S2. The absorbent main body 20 has an absorbent core 21 disposed at least in the crotch region S3. The absorbent core 21 comprises an absorbent material that absorbs liquid. The absorbent core 21 may be covered by a core wrap 22. The absorbent body 20 may have: the skin-surface sheet 25 positioned on the skin-surface side T1 with respect to the absorbent core 21, the liquid-impermeable sheet 26 positioned on the non-skin-surface side T2 with respect to the absorbent core 21, and the main body sheet 27 disposed on the non-skin-surface side T2 with respect to the liquid-impermeable sheet 26. The skin surface sheet 25 and the main body sheet 27 may be made of, for example, nonwoven fabric. The liquid-impermeable sheet 26 may be constituted by a film, for example.

The outer body 50 may have a front outer body 51 disposed in the front waistline region S1 and a rear outer body 52 disposed in the rear waistline region S2. The front exterior body 51 and the rear exterior body 52 may be separated or connected in the front-rear direction L. The length of the rear outer body 52 in the front-rear direction L may be longer than the front outer body 51. The rear outer body 52 may extend further to the crotch side than the side joint parts 60. As shown in fig. 1, the absorbent article 1 is provided with a side joint 60 that joins the front waistline region S1 and the back waistline region S2. The side joint 60 is a portion that engages the outer side portion of the front outer body 51 constituting the front waistline region S1 with the outer side portion of the rear outer body 52 constituting the rear waistline region S2. As shown in fig. 1, in a state where the side joint portions 60 are formed, a waist opening 62 through which the body of the wearer passes and a pair of leg hole openings 66 through which the legs of the wearer are respectively inserted are formed in the absorbent article 1. The waist opening 62 may be defined by the front end edge S1F of the front waistline region S1 and the rear end edge S2R of the back waistline region S2. Here, fig. 2 shows an extended state in which the absorbent article 1 is unfolded and stretched in the front-rear direction L and the width direction W by releasing the engagement at the side engagement portions 60. The side joint 60 may extend in the front-rear direction L in the front outer case 51 and the rear outer case 52, respectively. In the pants-type absorbent article 1, the boundary between the front waistline region S1 and the crotch region S3 may be defined by the rear end edge of the side joint portion 60 provided in the front outer body 51. The boundary between the rear waistline region S2 and the crotch region S3 may be defined by the front end edge of the side joint portion 60 provided in the rear outer body 52. In addition, the crotch region S3 may be a region provided with leg hole openings 66. The leg hole openings 66 may be portions recessed inward in the width direction W from the outer edges of the absorbent article 1.

As shown in fig. 3, the front exterior body 51 and the rear exterior body 52 may have a plurality of exterior sheets such as nonwoven fabrics. The exterior sheet may have a first exterior sheet 55 and a second exterior sheet 56 located on the non-skin-surface side T2 of the first exterior sheet 55. The first exterior sheet 55 and the second exterior sheet 56 may be formed of the same sheet that is folded or may be formed of another pair of sheets. The exterior sheet may be disposed on the non-skin surface side T2 as compared to the absorbent main body 20. The front outer body 51 and the rear outer body 52 may have a cover sheet 57 positioned on the skin surface side T1 compared to the absorbent main body 20. The cover sheet 57 may be formed of a portion of at least one of the exterior sheets folded toward the skin surface side T1, or may be formed of a sheet separate from the exterior sheet. An elastic member that can expand and contract in the width direction W may be disposed between the first exterior sheet 55 and the second exterior sheet 56. As shown in fig. 2 and 3, the elastic member may have a continuous elastic member 81 continuously extending in the width direction W between the pair of side joint portions 60 and a discontinuous elastic member 82 discontinuously extending between the pair of side joint portions 60. The discontinuous elastic member 82 is discontinuous in the width direction by being cut off at the center in the width direction W of the absorbent article. The stretching force of the region where the continuous elastic member 81 is arranged may be higher than the stretching force of the region where the discontinuous elastic member 82 is arranged. The elastic member may be constituted by, for example, a rubber wire stretchable in the width direction W or an elastic sheet stretchable in the width direction W. Alternatively, the elastic member may be constituted by the front outer body 51 itself constituted by a stretchable sheet, for example. The elastic member of the present embodiment is made of rubber filaments.

The absorbent article 1 according to the present embodiment is configured to suppress wrinkling of the front waistline region S1 and to easily and continuously cover the abdomen. Next, a structure for suppressing wrinkles in the front waistline region S1 and easily and continuously covering the abdomen will be described in detail. The front waistline region S1 has a plurality of regions that divide the front waistline region S1 in the front-back direction L. The plurality of regions includes first to tenth regions each formed by dividing the entire length of the front waistline region S1 in the front-back direction L into ten equal parts. Specifically, the front waist region S1 includes a first region ranging from 10% to 10% rearward, a second region ranging from 10% to 20% rearward, a third region ranging from 20% to 30% rearward, a fourth region ranging from 30% to 40% rearward, a fifth region ranging from 40% to 50% rearward, a sixth region ranging from 50% to 60% rearward, a seventh region ranging from 60% to 70% rearward, an eighth region ranging from 70% to 80% rearward, a ninth region ranging from 80% to 90% rearward, and a tenth region ranging from 90% to 100% rearward. As shown in fig. 2, the front waistline region S1 has a lower abdomen area F15, and the lower abdomen area F15 is located at a position apart from the front end edge S1F of the front waistline region S1 to the rear by 50 to 80% of the entire length of the front waistline region S1 in the front-rear direction L. The lower abdominal region F15 is constituted by sixth to eighth regions. Each region in the present embodiment is defined by the ratio of the lengths of the absorbent articles 1 in the extended state.

Fig. 4 is a diagram schematically showing a state in which the absorbent article 1 is worn by a wearer. Fig. 4 is a diagram showing a wearing state of the abdomen side in a state where the legs are opened by sitting. In fig. 4, the body curve of the wearer is indicated by a one-dot chain line BL. As shown in fig. 4, a recess extending in the width direction W is generally formed in the lower abdomen on the abdomen side of the wearer. The depression of the lower abdomen is curved upward from the center in the width direction W toward the outer side in the width direction W, and is easily and clearly formed particularly in infants. In general, the waist size of the depression in the lower abdomen is relatively short. As a result of intensive studies, the present applicant has found that the depression of the lower abdomen is disposed opposite to the lower abdomen area F15. The body part located on the crotch side as compared to the depression of the lower abdomen is easily deformed with the movement of the legs. In addition, the shape of the body located on the upper side (waist opening 62 side) than the depression of the lower abdomen becomes longer as the waist region of the abdomen goes upward. That is, the depression of the lower abdomen is a boundary where the body movement changes, and is a boundary where the waist circumference changes in size.

The absorbent article 1 is provided with a bending base point 71 that bends the front waistline region S1 in the front-back direction L. The bending base point 71 is disposed in the lower abdominal region F15. Since the bending base point 71 is provided in the lower abdominal region F15, the lower abdominal region F15 deforms with the bending base point 71 as a base point, and the following of the body movement by the absorbent article 1 is easily cut off. Specifically, when the body moves with the depression of the lower abdomen as a base point due to the movement of the legs up and down, the bending base point 71 deforms to intercept the movement of the crotch side, and the region closer to the waist opening 62 than the bending base point 71 becomes difficult to follow. If the bending base point 71 is located closer to the waist opening 62 than the lower abdomen area F15, the operation with the depression of the lower abdomen as the base point is difficult to be cut off. The region closer to the waist opening 62 than the depression of the lower abdomen (the region from the depression of the lower abdomen to the bending base point 71) also follows, and the range of the downward-offset region of the front waistline region S1 is widened. Further, if the bending base point 71 is located on the crotch side from the lower abdomen area F15, the deformation with the depression of the lower abdomen as the base point propagates toward the waist opening 62 without being intercepted by the bending base point 71, and the range of the downward-offset region of the front waistline region S1 becomes wider. However, by providing the bending base point 71 in the lower abdominal region F15, deformation due to the movement of the leg is cut off, and the entire front waistline region S1 can be restrained from being displaced due to the deformation due to the movement of the leg.

The absorbent article 1 has a region in which the bending base point 71 and the front end edge S1F of the front waistline region S1 are bisected in the front-back direction L. The bisected region has a first region F11 located on the side of the waist opening 62 and a second region F12 located on the lower crotch side. The first region F11 and the second region F12 are defined by the ratio of the lengths of the absorbent article 1 in the extended state. The length of the first region F11 in the width direction W in the natural state is longer than the length of the second region F12 in the width direction W in the natural state. That is, the waistline size of the front waistline region S1 becomes longer from the folding base point 71 toward the waist opening 62 side. The front waistline region S1 is deformed at the bending base point 71 so as to be fitted to the depression of the lower abdomen, and the length in the width direction W of the front waistline region S1 toward the waist opening 62 is longer than the bending base point 71, so that the entire front waistline region S1 is shaped to follow the external shape of the body. Therefore, the downward shift of the entire front waistline region S1 due to the size of the front waistline region S1 not being fit to the outer shape of the body can be suppressed. Therefore, wrinkling of the front waistline region S1 is suppressed, and continuous covering of the abdomen is easy. In particular, when the wearer is an infant who is difficult to transmit deterioration of wearing feeling or the like, the wearing aid imagines the performance and wearing feeling of the absorbent article according to the appearance of the absorbent article when worn. By continuously maintaining the absorbent article in place without shifting when worn, the wearer has the impression that this is an absorbent article 1 that is easily shifted during wear and the impression that the absorbent article 1 is suitable for long-term use. The wearing aid is hardly deteriorated in wearing feeling and uneasy to leak even in long-term use, and can be used with ease. In addition, when worn, the bending base point 71 is fitted to the depression of the lower abdomen, and therefore the bending base point 71 is less likely to be displaced in the front-rear direction. Therefore, even if the operation of pulling up the rear waistline region S2 is performed after the front waistline region S1 is brought into conformity with the shape of the body, the front waistline region S1 is less likely to shift, and the wearing property can be improved.

Further, since the length in the width direction W in the natural state of the first region F11 located on the waist opening 62 side is long, the legs and the waist can be easily inserted into the waist opening 62 of the pants-type absorbent article 1 when focusing on the wearing operation, and the wearing performance can be improved. The wearing assistant can give the impression of an absorbent article that everyone can wear to an appropriate position by the point that the wearing operation is easy. Therefore, the feeling of ease of wearing can also be obtained, and the feeling of ease of use of the absorbent article 1 can be more easily obtained. The length in the natural state of the present invention can be measured by separating and expanding the side joint 60 of the pants-type absorbent article and placing the absorbent article in an atmosphere of 60% ± 5% rh at 20 ℃ ± 2 ℃ for 60 minutes in contact with a measuring device such as a scale. In addition, when the length in the width direction in each region is changed, the length of the longest portion may be compared.

The bending base point 71 may be any deformation base point that bends the front waistline region S1 in the front-back direction L, and may extend parallel to the width direction W or may be inclined in the width direction W. The bending base point 71 may be any one having a difference in rigidity between the waist opening side and the crotch side across the bending base point 71, and when a plurality of bending base points 71 are formed in the front waistline region S1, the bending base point 71 provided in the lower abdomen region F15 can be extracted and the first region F11 and the second region F12 can be defined with reference to the bending base point 71. In addition, in the case where a plurality of bending base points 71 are formed in the lower abdomen area F15, the bending base point 71 located closest to the waist opening side can be extracted, and the first area F11 and the second area F12 can be defined with reference to the bending base point 71. In addition, when the bending base point 71 is inclined in the width direction or is bent, the first region F11 and the second region F12 can be defined by dividing the front end edge of the bending base point 71 by half between the front end edge S1F of the front waistline region S1.

The structure of the bending base point 71 is not limited, and examples thereof include a front edge 21F of the absorbent core 21, a slit formed in the absorbent core 21, a low mass portion (japanese: low plateau portion), a portion where the absorbent core 21 is cut in the front-rear direction L, and a portion where the number of layers of the sheet such as the skin-facing sheet is changed. The bending base point 71 may be formed by a portion of the front waistline region S1 having low bending rigidity in the front-back direction L. As the bending base point 71, at least one of a low-joined portion where the weight per unit area of the adhesive is low as compared with the surrounding area, a region where the members constituting the absorbent article 1 are not joined to each other, and a frangible portion where the members constituting the absorbent article are broken or broken can be exemplified.

The bending base point 71 may be constituted by the front end edge 21F of the absorbent core 21. Since the front end edge 21F of the absorbent core 21 having relatively high rigidity in the absorbent article 1 constitutes the folding base point 71, the front waistline region S1 is more likely to be deformed at the folding base point 71. Further, since the absorbent core 21 is not present on the waist opening 62 side of the bending base point 71, downward displacement of the absorbent core 21 on the waist opening 62 side of the lower abdominal concavity can be suppressed, and concentration of the creased absorbent core 21 to the crotch region S3 side can be suppressed. Since the absorbent core is not disposed in the region closer to the waist opening 62 than the bending base point 71, the rigidity is relatively low, and therefore the absorbent core tends to be bulky when discarded. The absorbent article can be folded by the folding base point 71 and the whole can be wrapped with the region on the waist opening 62 side of the folding base point 71, so that the absorbent article after use can be compactly gathered and discarded. By reducing the waste volume, the physical burden of the wearing assistant when the waste is discarded and the mental burden caused by a large amount of discarded waste can be reduced. In addition, the wearer can have the impression that this is an absorbent article that takes into account the environment.

The bending base point 71 may be formed by a region of the front waistline region S1 having the lowest bending rigidity in the front-back direction L from the first region to the tenth region. The "rigidity in the front-rear direction" of each region can be measured by the following method, for example. The rigidity was measured using a digital load cell 200gf (2N) (model FGP-0.2 manufactured by SHIMPO) and a load cell bracket (model GS-50X-H) 102. The front waistline region S1 in a natural state is stretched to a certain width. The constant width of the front waistline region S1 is 60% of the length of the front waistline region S1 in the width direction in the extended state. The front waistline region S1 as a test piece was attached to an acrylic plate for attachment of a dynamometer bracket. The acrylic plate is concave in a shape of . The width of the recessed portion was 115mm. The absorbent article is disposed such that the front edge S1F of the front waistline region S1 of the absorbent article 1 faces the digital dynamometer and the portion of the front waistline region S1 of the absorbent article 1 up to the mark (the mark located on the forefront edge side of the front waistline region) at a position that is 10% rearward from the front edge S1F protrudes from the end of the recess of the acrylic plate toward the digital dynamometer side. At this time, the test piece was disposed so that the center in the width direction of the tip of the digital dynamometer was opposed to the center in the width direction of the first region. An acrylic plate having a thickness of 2mm was covered from above, and a weight of 3.5kg was placed on the acrylic plate. In a state where the first region protrudes from the acrylic plate, the tip of the digital load cell is configured to approach the absorbent article to the limit so that the load is not applied to the digital load cell. The dimensions of the tip of the digital load cell were 10mm by 30mm. The first region of the front waistline region S1 is pressed by the tip of the digital dynamometer. The condition at the time of pressing was that the pressing was performed at 100mm/min for 5mm, and the data taking interval was 10 times/sec. In this state, the rigidity of the region from the front end edge to the mark at a position separated by 10% rearward from the front waistline region of the absorbent article was measured using a digital dynamometer. This value was measured once and used as the stiffness value of the region. By doing so, the rigidity of the first region of the front waistline region S1 is measured. Next, in order to measure the rigidity of the next region, the region from the front end edge to the mark at a position 10% away rearward from the front waistline region S1 of the absorbent article is cut off. By the same procedure, the rigidity of the region from the mark at the position 10% away from the front end edge to the mark at the position 20% away from the rear of the front waistline region S1 of the absorbent article was measured. This measurement was repeated ten times, and the rigidity (N) of the region in which the entire length of the front waistline region S1 was divided into ten equal parts in the front-back direction L was measured.

It is preferable that the region on the waist opening 62 side of the bending base point 71 is likely to continuously cover the bulge of the abdomen of the wearer. More specifically, the region closer to the waist opening 62 than the bending base point 71 may be configured to be less likely to wrinkle in the front-rear direction L than the bending base point 71, or may be provided with a stretchable sheet. The bulge of the abdomen extending upward from the depression of the lower abdomen is easily continuously covered by the front waistline region S1. Therefore, wrinkling of the front waistline region S1 can be further suppressed.

The narrow portion 75 having the shortest length in the width direction of the front waistline region S1 in the natural state may be provided in the lower abdomen area F15. The lower abdomen is concave with a shorter waistline size. By disposing the narrow portion 75 in the depression of the lower abdomen, the front waistline region S1 becomes more easily shaped along the body. If the narrow portion 75 is supposed to be in contact with a portion having a longer waistline size, the narrow portion 75 is strongly in contact with a body part, and there is a possibility that a sense of discomfort or redness may occur at the contact portion. However, the narrow portion 75 is in contact with the depression of the lower abdomen having a short waist size, and therefore, it is possible to prevent a problem such as redness. In addition, when wearing, the narrow portion 75 is fitted to the depression of the lower abdomen, and therefore, the narrow portion 75 is less likely to be displaced in the front-rear direction. Therefore, even if the operation of pulling up the rear waistline region S2 is performed after the front waistline region S1 is brought into conformity with the shape of the body, the front waistline region S1 is less likely to shift, and the wearing property can be improved. The narrow portion 75 may be defined by a portion having the shortest length in the width direction by visual observation in the same state as the measurement of the length in the natural state. In the case where a plurality of elastic members are arranged at intervals in the front waistline region S1 along the front-back direction L, the length of the position where each elastic member is arranged may be compared to define the narrow portion 75. The narrow portion 75 of the present embodiment is formed of a portion where the continuous elastic member 81 is disposed, and is provided in the seventh region. In the wearing example shown in fig. 4, the eighth region provided with the bending base point 71 and the high shrinkage region is fitted to the depression of the lower abdomen, and the seventh region provided with the narrow portion 75 is worn on the waist opening side of the depression of the lower abdomen. However, in another wearing example, the seventh region provided with the narrow portion 75 may be fitted to the depression of the lower abdomen, and the eighth region provided with the bending base point 71 and the high contraction region may be worn on the crotch side of the depression of the lower abdomen.

The narrow width portion 75 may also be arranged apart from the bending base point 71 in the front-rear direction L. Since the narrow portion 75 is separated from the bending base point 71, the narrow portion and the bending base point are independent from each other, and can be prevented from excessively following each other. Therefore, positional displacement of the narrow portion 75 can be suppressed. The distance between the narrow portion 75 and the bending base point 71 in the front-rear direction L may be preferably 10mm or less, and more preferably 5mm or less. Further, a continuous elastic member 81 different from the continuous elastic member 81 constituting the narrow portion 75 may be disposed between the narrow portion 75 and the bending base point 71. By the contraction of the continuous elastic member 81, the gap between the narrow portion 75 and the bending base point 71 can be cut, and excessive follow-up between each other can be effectively suppressed. The narrow portion 75 may be located on the waist opening 62 side than the bending base point 71. According to the present embodiment, in the region on the crotch lower side than the narrow width portion 75, the force can be cut off by the bending base point 71. The narrow portion 75 is difficult to follow the movement of the leg and is difficult to shift in position, and therefore is difficult to shift even for a violent movement.

The absorbent article 1 has a third region F13 extending between the folding base point 71 and the rear end edge of the front waistline region S1 in the front waistline region S1. That is, in the front waistline region S1, a first region F11, a second region F12, a bending base 71, and a third region F13 are arranged in this order from the front end edge S1F toward the crotch side. The third region F13 is a region sandwiched between the rear end edge of the bending base point 71 and the rear end edge of the front waistline region S1. The length of the third region F13 in the width direction W in the natural state may be longer than the length of the second region F12 in the width direction W. The third region is located on the crotch side from the depression of the lower abdomen and is disposed at the root of the leg. By extending the length of the third region in the natural state, the tightening feeling around the leg can be reduced, and the vibration (force applied in the offset direction) at the time of the leg operation can be made difficult to be transmitted to the entire front waistline region S1.

The third region F13 has a region bisected by the third region F13 in the front-rear direction L. The bisected region has a third front region F131 located on the waist opening 62 side and a third rear region F132 located on the crotch side. The length in the width direction of the third front region in the natural state may be shorter than the length in the width direction of the third rear region in the natural state. According to the present embodiment, the length in the width direction W of the front waistline region becomes gradually longer from the folding base point 71 toward the crotch side. Therefore, it becomes difficult to interfere with the movement of the wearer's legs. The leg support can be configured so that the wearer (particularly, an infant) does not tighten around the abdomen and the legs, and the wearer's legs are easily moved but hardly offset.

The difference between the length in the width direction of the first region F11 and the length in the width direction W of the second region F12 in the natural state of the absorbent article may be 9% or more or 15mm or more with respect to the length in the width direction W of the first region F11 in the elongated state of the absorbent article 1. The waist size of the abdomen of an infant often bulges from the depression of the lower abdomen toward the upper drum, and the variation in the waist size is larger on the upper side than the depression of the lower abdomen. According to the present embodiment, the amount of change in the width direction W of the absorbent article 1 in the region above the depression of the lower abdomen is large, and therefore the shape of the absorbent article in the natural state is likely to match the body shape of an infant (particularly, an infant of low age in the month) and is likely to follow the body without tightening.

The difference between the length in the width direction W of the second region F12 in the natural state of the absorbent article 1 and the length in the width direction W of the narrow portion 75 having the shortest length in the width direction W of the front waistline region S1 may be 15% or more or 25mm or more with respect to the length in the width direction W of the second region F12 in the extended state of the absorbent article 1. The waist size of the infant on the abdomen side is such that the depression in the lower abdomen becomes locally shorter. According to the present embodiment, since the absorbent article in the width direction of the depression of the lower abdomen is greatly changed, the depression of the lower abdomen is more easily fitted.

The absorbent article 1 may be designed so as to be suitable for the contraction force of each region of the front waistline region S1, or the contraction force may be different from each other in the width direction W from the first region to the tenth region. By increasing the contraction force in this region, the abdomen is configured to be fitted to the wearer's abdomen and to be easily and continuously covered. In the present embodiment, the "contractility" of each region was measured by the following method. First, when measuring the contraction force of each region, a test piece to be measured is produced. When the absorbent article 1 has the side joint 60, the side joint 60 is released, and the absorbent article 1 is unfolded. Next, the length in the width direction W and the length in the front-rear direction L are measured in an elongated state in which the absorbent article 1 is elongated, and the boundaries are scored. Next, ten test pieces were cut out, each of which was obtained by dividing the front waistline region S1 into ten parts in the front-back direction L, and both end portions of the cut test pieces were held by chucks (holders) of a tensile tester. At this time, the distance between chucks was set to 50mm. Then, one of the chucks in the width direction W is fixed, and the other chuck is moved so as to change the distance between the chucks. The moving speed of the chuck at this time was set to 300 mm/min. During the movement of the chuck, the stress applied by the chuck was measured, and the stress (N) obtained in a state of 60% (a certain width) from the extended state was defined as "shrinkage force". By doing so, the contraction force in the width direction from the first region to the tenth region can be obtained.

The front waistline region S1 has a high-contraction region in which the contraction force in the width direction is highest from the first region to the tenth region. The high shrinkage region may be located in the lower abdominal region F15. By positioning the high shrinkage region in the lower abdomen area F15, the high shrinkage region is bonded to the depression of the lower abdomen, and the absorbent article is less likely to be displaced in the front-rear direction L, whereby the downward displacement of the absorbent article 1 can be further suppressed. A continuous elastic member 81 may be provided in the high shrinkage region. The bending base point 71 may be disposed in the high shrinkage region. That is, the bending base point 71 is arranged in the region having the highest contraction force in the width direction from the first region to the tenth region. According to the present embodiment, the bending base point 71 can be made to adhere to the depression of the lower abdomen, and the bending base point 71 is made difficult to be displaced in the front-rear direction L. The depression of the lower abdomen is prone to skin stretching due to the change in posture of the wearer. The high contraction region is disposed opposite to the depression of the lower abdomen, and is susceptible to a force of deformation in the front-rear direction L due to a change in the posture of the wearer. A bending base point 71 serving as a deformation base point in the front-rear direction L is provided in the high shrinkage region. Therefore, the high-shrinkage region deforms at the bending base point 71, and the front waistline region S1 becomes easy to follow the deformation of the body. This can suppress downward displacement of the entire front waistline region S1.

If the contraction force in the width direction at the region on the waist opening side compared to the high contraction region is compared among the regions dividing the front waistline region S1 into ten in the front-back direction L, the contraction force at the region on the waist opening side may be lower than the contraction force at the region on the crotch side. Specifically, the high shrinkage region of the present embodiment is constituted by the eighth region. When comparing the contraction forces of the first region to the seventh region located on the waist opening side with respect to the eighth region, any one of the contraction force of the first region < the contraction force of the second region, the contraction force of the second region < the contraction force of the third region, the contraction force of the third region < the contraction force of the fourth region, the contraction force of the fourth region < the contraction force of the fifth region, the contraction force of the fifth region < the contraction force of the sixth region, and the contraction force of the sixth region < the contraction force of the seventh region may be satisfied. The contraction force gradually becomes lower from the high contraction region toward the waist opening side. Thus, a stress arrangement can be made that particularly bulges in a body shape along the abdomen of the infant. Therefore, the front waistline region S1 as a whole is more difficult to shift downward. Preferably, the first region contraction force < second region contraction force < third region contraction force < fourth region contraction force < fifth region contraction force < sixth region contraction force < seventh region contraction force is satisfied. For example, if the contraction force of the region contacting the portion having the longer waistline size is high, the region is deviated to the portion having the shorter waistline size by the contraction, and the deviation of the absorbent article is likely to occur. However, since the contraction force of the front waistline region S1 matches the shape of the body, the displacement of the absorbent article can be suppressed.

The contraction force in the width direction of the region located on the crotch side than the bending base point 71 may be lower than the contraction force in the width direction of the region located on the waist opening 62 side than the bending base point 71. Specifically, for example, the number of the discontinuous elastic members 82 on the waist opening side of the bending base point 71 may be smaller than the number of the discontinuous elastic members 82 on the crotch side of the bending base point 71. The elastic members of the discontinuous elastic members 82 are discontinuous in the width direction W, and thus may easily come off the body. If the number of discontinuous elastic members on the front edge side of the front waistline region S1 is too large relative to the folding base point 71, the fitting property with respect to the body in the vicinity of the front edge of the front waistline region S1 may not be sufficiently ensured. As a result, deformation due to the lack of body following action occurs near the front end edge of the front waistline region S1, which may cause wrinkles near the front end edge of the front waistline region S1 and downward displacement of the entire front waistline region S1. However, since the number of discontinuous elastic members 82 on the side of the waist opening 62 is smaller than that of the bending base point 71, it is possible to suppress wrinkles in the vicinity of the front end edge of the front waistline region S1 and downward displacement of the entire front waistline region S1 while ensuring the fitting property in the vicinity of the front end edge of the front waistline region S1. In another embodiment, the discontinuous elastic member may be disposed only on the crotch side of the bending base point 71, and the continuous elastic member 81 may be disposed only on the waist opening 62 side of the bending base point 71.

Fig. 5 is a schematic side view of an absorbent article folded in half. The length L4 of the absorbent core in the front-rear direction L in the front waistline region S1 may be 1/2 or less of the entire region in the front-rear direction L with respect to the front waistline region S1. Since the end portion of the absorbent core on the abdomen side is positioned on the crotch side of half of the front waistline, the absorbent core in the front waistline region S1 is less likely to be affected by the movement of the legs, and the transfer of the absorbent core to the crotch side can be suppressed. In addition, the first distance L1 from the front end edge of the absorbent core to the front end edge of the front waistline region S1 may be longer than the second distance L2 from the rear end edge of the absorbent core to the rear end edge of the rear waistline region. That is, the region of the front waistline region S1 where the absorbent core 21 is not present is wide. As a result, the soft region in the front waistline region S1 is widened, and therefore, the absorbent core in the front waistline region S1 is less susceptible to the movement of the legs, and the transfer of the absorbent core to the crotch side can be suppressed. The difference L3 between the distance from the fold line FL to the rear end edge of the absorbent core and the distance from the fold line to the front end edge of the absorbent core is shorter than the length L4 of the absorbent core in the front-rear direction L in the front waistline region S1. According to the present embodiment, the absorbent core is not present in at least half of the entire area in the front-rear direction of the front waistline region. Thus, in a state in which the absorbent article is folded along the folding line, the length of the absorbent core in the rear waistline region extending upward (back side) from the absorbent core in the front waistline region can be made relatively short. That is, the length of the absorbent core of the rear waistline region does not become extremely long with respect to the absorbent core of the front waistline region. Therefore, when the absorbent article is pulled up to the waist of the wearer by grasping the vicinity of the side joint portions, the upward pulling force can be transmitted to both the absorbent core of the rear waistline region and the absorbent core of the front waistline region. Therefore, the entire absorbent article can be disposed at an appropriate position covering the waist circumference.

The present invention has been described in detail using the above embodiments, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention as defined in the claims. Accordingly, the description herein is intended to be illustrative, and not limiting in any way.

Further, the entire contents of japanese patent application No. 2021-109320, filed on 6/30 of 2021, are incorporated herein by reference.

Industrial applicability

An absorptive article which suppresses the displacement of a front waistline region toward a crotch region, suppresses wrinkling of the front waistline region, and is easy to continuously cover the abdomen.

Symbol description

1: absorbent article, 21: absorbent core, 60: side joint portion, 62: waist opening, 71: bending base point, 75: narrow width portion, 81: continuous elastic member, 82: discontinuous elastic member, F11: first region, F12: second region, F13: third region, F131: third front region, F132: third rear region, F15: lower abdominal region, FL: fold line, L: front-rear direction, S1: front waistline region, S2: rear waistline region, S3: crotch region, W: in the width direction.

Claims (11)

1. An absorbent article comprising:

a front-rear direction and a width direction orthogonal to each other;

a front waistline region;

a rear waistline region;

a crotch region disposed between the front waistline region and the back waistline region;

a side joint portion joining the front waistline region and the back waistline region; and

an absorbent core disposed at least in the crotch region,

it is characterized in that the method comprises the steps of,

the bending base point at which the front waistline region is bent in the front-back direction is provided in a lower abdomen region located at a position that is separated from the front end edge of the front waistline region to the rear by 50 to 80% of the total length of the front waistline region in the front-back direction,

the length in the width direction in a natural state of a first region located on the waist opening side in a region bisected in the front-rear direction between the folding base point and the front end edge of the front waistline region is longer than the length in the width direction in a natural state of a second region located on the crotch side in the bisected region.

2. The absorbent article of claim 1, wherein the absorbent article comprises,

in a natural state of the absorbent article, a narrow portion of the front waistline region having the shortest length in the width direction is provided in the lower abdomen area.

3. The absorbent article of claim 2, wherein the absorbent article comprises,

the narrow portion is disposed apart from the bending base point in the front-rear direction.

4. The absorbent article as set forth in claim 3 wherein,

the narrow portion is located on the waist opening side from the bending base point.

5. The absorbent article as set forth in any one of claims 1 to 4 wherein,

the length in the width direction in the natural state of the third region extending between the bending base point and the rear end edge of the front waistline region is longer than the length in the width direction in the natural state of the second region.

6. The absorbent article as set forth in claim 5 wherein,

the third region has a third front region which is a region bisecting the third region in the front-rear direction and located on the waist opening side, and a third rear region which is a region bisecting the third region in the front-rear direction and located on the crotch side,

the length in the width direction of the third front region in the natural state is shorter than the length in the width direction of the third rear region in the natural state.

7. The absorbent article as set forth in any one of claims 1 to 6 wherein,

the bending base point is constituted by the front end edge of the absorbent core.

8. The absorbent article as claimed in any one of claims 1 to 7, characterized in that,

a discontinuous elastic member is disposed between the pair of side joint portions across the front waistline region,

the number of the discontinuous elastic members on the waist opening side of the bending base point is smaller than the number of the discontinuous elastic members on the crotch side of the bending base point.

9. The absorbent article as claimed in any one of claims 1 to 8, characterized in that,

the front waistline region has a high shrinkage region with highest shrinkage force in the width direction in a region which is formed by ten equal divisions of the front waistline region in the front-back direction,

the bending base point is arranged in the high shrinkage area.

10. The absorbent article as in claim 9, wherein,

when comparing the contraction force in the width direction of the region located on the waist opening side compared to the high contraction region among the regions in which the front waistline region is divided into ten equal portions in the front-back direction, the contraction force of the region located on the waist opening side is lower than the contraction force of the region located on the crotch side.

11. The absorbent article as claimed in any one of claims 1-10, characterized in that,

a fold line for folding the absorbent article in half extends in the width direction in the crotch region,

the length of the absorbent core in the front waistline region in the front-back direction is 1/2 or less of the entire region in the front-back direction with respect to the front waistline region,

a first distance from the front end edge of the absorbent core to the front end edge of the front waistline region is longer than a second distance from the rear end edge of the absorbent core to the rear end edge of the rear waistline region,

the difference between the distance from the fold line to the rear end edge of the absorbent core and the distance from the fold line to the front end edge of the absorbent core is shorter than the length of the absorbent core in the front-rear direction in the front waistline region.