CN115884737A - Underpants type absorbent article - Google Patents

Abstract

A pants-type absorbent article (1) comprises an absorbent main body (10), a waist member (20) laminated on the non-skin side of the absorbent main body (10), and a pair of separating sections (25) for separating the waist member (20) into a front body panel (20 f) and a back body panel (20 b). At least one pair of locking portions (32) are provided on both left and right side portions of one of the front body piece (20 f) and the rear body piece (20 b), each of the locking portions (32) being removably locked to a predetermined region of the other of the front body piece (20 f) and the rear body piece (20 b). The other of the front body piece (20 f) and the rear body piece (20 b) has an expansion/contraction region (20 EA) that is expandable/contractible in the left-right direction at a position corresponding to the center in the vertical direction of the locking portion (32).

Description

Underpants type absorbent article

Technical Field

The present invention relates to an underpants type absorbent article.

Background

Conventionally, there is known an absorbent article such as a disposable diaper in which a part of a waist member formed in a pants-type shape is cut out so that it can be used also as a belt-type (unfolded-type) diaper. For example, patent document 1 discloses a pants-type diaper which can be opened in a double-door manner by providing a pair of breaking guide lines on a stomach-side portion of an outer package and cutting the outer package along the breaking guide lines. Such pants-type diapers are dual-purpose disposable diapers, and can also be used as tape-type diapers by using fastening tapes that are pulled out after being opened.

Documents of the prior art

Patent document

Patent document 1: japanese patent application laid-open No. 2010-131197

Disclosure of Invention

Problems to be solved by the invention

In a disposable diaper of a dual-purpose type such as in patent document 1, when the disposable diaper is used in a tape type by cutting a part of an exterior body from a pants-type state, there is a risk of deterioration of fit. For example, even if the waist portion of the diaper has excellent fit when the diaper is used as an underpants type diaper, the fit around the waist portion is insufficient when the diaper is used as a belt type diaper as compared with the case where it is used as an underpants type diaper. And this leads to a risk of positional deviation of the diaper or a risk of leakage of excrement.

The present invention has been made in view of the above problems, and an object of the present invention is to achieve excellent fit of a pants-type absorbent article that can also be used as a belt-type absorbent article.

Means for solving the problems

A main aspect of the present invention for achieving the above object is a pants-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting each other, the pants-type absorbent article comprising: an absorbent main body; and a waistline member configured to be laminated on a non-skin side of the absorbent main body, a pair of separating portions for separating the waistline member into a front body panel and a back body panel, at least a pair of locking portions provided at both side portions in a left-right direction of either one of the front body panel and the back body panel, each of the pair of locking portions being a portion removably locked to a predetermined region of the remaining other one of the front body panel and the back body panel, and the other one of the front body panel and the back body panel including a stretchable region at a vertically central position of the locking portion, the stretchable region being a region stretchable in the left-right direction.

Other features of the present invention will become apparent by reading the description of the specification with reference to the attached drawings.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, excellent fit can be achieved in a pants-type absorbent article that can also be used as a belt-type absorbent article.

Drawings

Fig. 1 is a schematic perspective view of a diaper 1 according to a first embodiment.

Fig. 2 is a plan view of the diaper 1 in an unfolded and stretched state as seen from the skin side in the thickness direction.

Fig. 3 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A in fig. 2.

Fig. 4A and 4B are views showing the operation of separating the waist member 20 of the diaper 1 into the front waist member 20f and the back waist member 20B.

FIG. 5 is an developed plan view of the diaper 1 in a state where the front waist member 20f and the back waist member 20b are separated from each other.

Fig. 6 is a plan view showing a state where the diaper 1 in a belt-type state is again put into an underpants-type state and stretched.

Fig. 7 is a plan view of the diaper 2 in an unfolded and stretched state as seen from the skin side in the thickness direction.

Detailed Description

At least the following matters will become clear from the description of the present specification and the accompanying drawings.

A pant-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting each other, the pant-type absorbent article comprising: an absorbent main body; and a waistline member configured to be laminated on a non-skin side of the absorbent main body, a pair of separating portions for separating the waistline member into a front body panel and a back body panel, at least a pair of locking portions provided at both side portions in a left-right direction of either one of the front body panel and the back body panel, each of the pair of locking portions being a portion removably locked to a predetermined region of the remaining other one of the front body panel and the back body panel, and the other one of the front body panel and the back body panel including a stretchable region at a vertically central position of the locking portion, the stretchable region being a region stretchable in the left-right direction.

According to the above-described pant-type absorbent article, in the waistline member (front body panel) to which the pair of locking portions are locked, a contracting force in the left-right direction is applied to the region between the locking portions. That is, in the waistline opening in which the front body panel and the back body panel are connected in a looped manner by the pair of locking portions, pulling the locking portions inward in the left-right direction makes the waistline opening more easily contracted. Therefore, excellent fit can be achieved regardless of whether the absorbent article is used in a pants-type form or a belt-type form.

In such a pants-type absorbent article, it is desirable that the absorbent main body includes an absorber elastic member that stretches and contracts in the longitudinal direction of the absorbent main body.

According to the above-described pant-type absorbent article, the absorber elastic member contracts toward the wearer's skin side and pulls up the absorbent body during use of the pant-type absorbent article, which makes it possible to improve the fit and absorbency in the crotch portion. That is, the fit of the absorbent body to the crotch of the wearer can be enhanced, and the fit of the waist member to the waist of the wearer can be enhanced. This therefore enables the fit of the entire absorbent article to be enhanced.

In such a pants-type absorbent article, it is desirable that a plurality of the absorber elastic members are provided at predetermined intervals in the left-right direction, and a left-right direction width of the stretchable region is larger than a left-right direction distance between the absorber elastic member disposed outermost at one side in the left-right direction and the absorber elastic member disposed outermost at the other side in the left-right direction.

According to the pants-type absorbent article, the range of the contraction force exerted on the front body by the stretchable region becomes wider in the left-right direction than the range of the contraction force exerted on the absorbent main body by the absorbent elastic member. This makes it easier for the contraction force exhibited by the stretch region to resist the tensile force exhibited by the absorbent elastic member. Therefore, even if the absorbent main body is pulled down by the contractive force of the absorbent body elastic member, the front body panel is difficult to be pulled down. Therefore, this makes it possible to easily maintain excellent fit.

In such a pants-type absorbent article, it is desirable that the absorbent main body includes an absorbent core containing a super absorbent polymer, and the width in the left-right direction of the stretchable region is larger than the width in the left-right direction of the absorbent core.

According to the pants-type absorbent article, the range in which the contractive force is applied by the stretchable region is larger than the width of the absorbent core in the left-right direction. Therefore, even if the absorbent core is pulled down by the contractive force of the absorbent elastic member, the front body panel is difficult to be pulled down. Therefore, this makes it easier to maintain excellent fit.

In such a pants-type absorbent article, it is desirable that the width in the left-right direction of the stretchable region is larger than the width in the left-right direction of the absorbent main body.

According to the pants-type absorbent article, the range in which the contractive force is applied by the stretchable region is larger than the width of the absorbent main body in the left-right direction. Therefore, even if the absorbent main body is pulled down by the contractive force of the absorbent body elastic member, the front body panel is difficult to be pulled down. Therefore, this makes it easier to maintain excellent fit.

In such a pants-type absorbent article, it is desirable that the front-side upper end of the absorber elastic member is located below the lower end of the stretchable region in the up-down direction.

According to the pants-type absorbent article, the region to which the contraction force exerted by the absorber elastic member is applied does not overlap the stretchable region, and therefore the contraction force exerted by the absorber elastic member is not easily exerted on the stretchable region. This makes it less likely to cause flexure or the like in the front body. Therefore, when the locking portion is locked to the front body, the surface of the front body is easily maintained in a flat state, so that the locking portion is more easily securely locked. Thus, this makes it possible to further enhance the fit around the waistline.

In such a pants-type absorbent article, it is desirable that a front-side upper end of the absorber elastic member is located below a lower end of the separating portion in the up-down direction.

According to the pants-type absorbent article described above, the region where the contraction force exerted by the absorber elastic member is exerted does not overlap the region between the pair of separated portions, and therefore the contraction force exerted by the absorber elastic member is not easily exerted on the region between the pair of separated portions. This makes it less likely that flexing or the like will occur in the region between the separated portions of the front body section. This makes it easier to separate the separating portion in the absorbent article in the pants-type state.

In such a pants-type absorbent article, it is desirable that the pants-type absorbent article further includes a pair of side joint portions in both end portions in the left-right direction, each of the pair of side joint portions being a portion where the front body panel and the rear body panel are joined to each other, and the lock portions are located on the outer side in the left-right direction of the absorber elastic member and on the inner side in the left-right direction of the side joint portions in a state where the lock portions are locked to the waist member.

According to the pants-type absorbent article described above, in the region located on the left-right direction outer side of the absorber elastic member and on the left-right direction inner side of the side joint portion, the contraction force exhibited by the absorber elastic member is less likely to be affected. Therefore, locking the locking portion to the area can make the locking portion more easily locked more stably. Thus, this makes it possible to further improve the fit of the waistline member in the waistline of the wearer.

In such a pants-type absorbent article, it is desirable to provide the following portions: in this portion, both end portions in the left-right direction of the absorbent main body and the stretchable region overlap each other with respect to the up-down direction.

According to the pants-type absorbent article, the left and right direction end portions of the absorbent main body are easily pulled outward in the left and right direction by the stretchable region. That is, a force that unfolds the absorbent main body is applied, which makes it easier to suppress leakage of excrement, which makes it difficult for the absorbent main body to rise up from the wearer's body. This therefore makes it possible to enhance the fit of the absorbent main body during use of the absorbent article.

In such a pants-type absorbent article, it is desirable that, in an unfolded and extended state, a contraction force in the left-right direction of the stretchable region in a portion where the stretchable region overlaps with the absorbent main body when viewed in a thickness direction is smaller than a contraction force in the left-right direction of the stretchable region in a portion where the stretchable region does not overlap with the absorbent main body when viewed in the thickness direction.

According to the pants-type absorbent article described above, an excessive contraction force is not easily applied to the portion overlapping the absorbent main body in the thickness direction, which suppresses undulation of the absorbent main body and the like. This therefore makes it easier for the absorbent body to be fitted to the wearer's skin, so that the fit can be easily maintained around the entire waistline.

In such a pants-type absorbent article, it is desirable that a low stretch region having a lower stretchability than the stretchable region is provided, and the low stretch region is disposed on the outer side in the left-right direction of the stretchable region.

According to the pants-type absorbent article described above, in the region of the waistline member provided with the low stretch region and located outside the stretch region, wrinkles are not easily formed on the surface of the waistline member, so that it is easier to ensure the shape retention ability of the sheet members constituting the waistline member. This makes it easier to smoothly perform the operation of unlocking the locking portions locked to the periphery of the low stretch region from the lumbar member.

In such a pants-type absorbent article, it is desirable that at least a part of the low stretch region is disposed outside the stretch region in the left-right direction and at a position overlapping the stretch region with respect to the up-down direction.

According to the pants-type absorbent article described above, the low stretch regions are provided on both sides of the stretch region, which makes it possible to more smoothly unlock the lock portions locked to the region overlapping with the low stretch regions from the waistline member.

In such a pants-type absorbent article, it is desirable that the width in the left-right direction of the stretchable region is larger than the width in the left-right direction of the low stretchable region.

According to the pants-type absorbent article, the width in the lateral direction of the stretchable region is larger than the width in the lateral direction of the low stretchable region, and therefore sufficient stretchability can be more easily imparted to the waist member. Therefore, the waistline member is more easily contracted in the region in the left-right direction between the pair of locked locking portions, so that the fit around the waistline of the wearer can be further enhanced.

In such a pants-type absorbent article, it is desirable that the entire lock portion overlaps with the stretchable region with respect to the up-down direction.

According to the pants-type absorbent article described above, the contractive force exhibited by the stretchable region is exerted on the entire lock portions in the up-down direction, which makes it easy for the waistline member to be pulled toward the left-right direction inside through the lock portions, so that the fit of the waistline opening can be enhanced.

In such a pants-type absorbent article, it is desirable that the absorbent main body includes an absorbent core containing a super absorbent polymer, and the lower end of the locking portion is located above the upper end of the absorbent core in the up-down direction.

According to the above-described pants-type absorbent article, the absorbent core having high rigidity does not overlap the locking portions with respect to the up-down direction, and therefore, in the region between the pair of locking portions, the absorbent core is inhibited from impeding expansion and contraction of the expansion and contraction region. Therefore, this makes it possible to easily maintain excellent fit of the waistline member.

In such a pant-type absorbent article, it is desirable that the pant-type absorbent article further comprises a tab having the locking portion, a tab engaging portion is provided on an outer side of the locking portion in the left-right direction, the tab engaging portion is a portion that engages the tab to the waistline member, and the locking portion is provided with either one of a hook member and a loop member in a hook-and-loop fastener.

According to the pants-type absorbent article described above, the user can easily lock or unlock the locking portions to or from the waist member by gripping the tabs. Further, the locking portion is provided with a hook member or a loop member for locking, which enables repeated attachment and detachment of the locking portion to and from the surface of the lumbar member. This therefore enables the locking position to be easily adjusted during locking of the locking portion.

In such a pants-type absorbent article, it is desirable that the pants-type absorbent article further includes a pair of side joining portions in both end portions in the left-right direction, each of the pair of side joining portions being a portion joining the front body panel and the rear body panel to each other, the tab joining portion is provided at any position from an outer end of the absorbent main body to the side joining portion in the left-right direction, and the separating portion is disposed between the tab joining portion and the locking portion in the left-right direction.

According to the pants-type absorbent article described above, when the user separates the separated portion, the separated portion can be easily separated by gripping the tab with one hand, gripping the waist member with the other hand, and pulling the members in the opposite direction. Therefore, this makes it possible to easily perform an operation of removing the absorbent article from the body of the wearer or deforming the absorbent article from a pants-type absorbent article into a belt-type absorbent article.

In such a pants-type absorbent article, it is desirable that the back body panel includes leg elastic members that are stretchable in the left-right direction along a lower end edge portion of the back body panel.

According to the pants-type absorbent article described above, stretchability is imparted along the leg-hole openings of the absorbent article, which makes the leg-hole openings more likely to fit around the legs of the wearer. In particular, in the rear body panel, the leg hole openings are liable to be lifted off the buttocks or to cause positional deviation due to the influence of projections of the buttocks of the wearer and the like. Therefore, providing the leg elastic members makes it possible to improve the fit of the back body around the legs and makes it less likely that the wearer will feel uncomfortable.

In such a pants-type absorbent article, it is desirable that the absorbent main body includes an absorber elastic member that stretches and contracts along a longitudinal direction of the absorbent main body, and that the stress in the left-right direction of the stretchable region is greater than the stress in the up-down direction of a region where the absorber elastic member is disposed.

According to the pants-type absorbent article described above, the stress of the stretchable region is greater than the stress of the absorber elastic member, and therefore, when the force that pulls the upper end portion of the absorbent main body downward against the absorber elastic member, the positional displacement of the waistline member is less likely to occur. Therefore, this makes it possible to easily maintain the fit of the waistline member around the waistline of the wearer.

In such a pants-type absorbent article, it is desirable that the other of the front body panel and the rear body panel includes the stretchable region in the entire portion between the upper and lower ends in the up-down direction of the locking portions and between the inner side ends in the left-right direction of a pair of the locking portions.

According to the pants-type absorbent article, the entire rectangular region sandwiched between the pair of left and right locking portions is contracted in the left-right direction, so that both end portions in the left-right direction of the back body are more easily pulled toward the inside by the pair of locking portions. Therefore, the waistline opening contracts and becomes more easily fitted along the waistline of the wearer, so that positional deviation does not easily occur.

In such a pants-type absorbent article, it is desirable that the absorbent main body includes an absorber elastic member that stretches and contracts in a longitudinal direction of the absorbent main body, and a length of a portion of the absorber elastic member located on a rear side with respect to a central position is longer than a length of a portion of the absorber elastic member located on a front side with respect to the central position in the longitudinal direction.

According to the above-described pant-type absorbent article, the contraction force exhibited by the absorber elastic members is exerted on the hip side of the wearer, which makes it easier for the absorbent main body to fit firmly to the seams in the hip portion. Therefore, this makes it possible to further enhance the fit of the pant-type absorbent article and suppress leakage of excretory fluid such as menstrual blood.

In such a pants-type absorbent article, it is desirable that the back body panel includes a tab in which the locking portion is provided, and a rear-side upper end of the absorber elastic member is located above a lower end of the tab in the up-down direction.

According to the above-described pant-type absorbent article, when the wearer grasps the tab and pulls the tab in the left-right direction to lock it to the front waistline member side, the rear-side upper end portion of the absorber elastic member is pulled in the left-right direction. This makes the rear region of the absorbent main body less likely to slide down and makes the absorbent main body more likely to fit into the furrows of the wearer's buttocks due to the contractive force of the absorbent elastic member.

In such a pants-type absorbent article, it is desirable that the pants-type absorbent article further comprises: a front leg elastic member extending along an end edge portion located on a lower side of the front body in the vertical direction; and a rear leg elastic member that extends along an end edge portion located on a lower side of the rear body section in the up-down direction, and a length of the front leg elastic member in the left-right direction is shorter than a length of the rear leg elastic member in the left-right direction.

According to the above-described pant-type absorbent article, the regions to which the contraction force exhibited by the front leg elastic members is not applied are provided in both end portions in the left-right direction of the front waist member, which makes the front waist member less likely to contract. Therefore, the edges formed in the left-right direction end portions of the front waist member are grasped, which makes it possible to easily perform the operation of locking the tabs provided on the rear waist member. Therefore, the operation of putting on the pants-type absorbent article can be performed more easily, and the pants-type absorbent article can be made to fit the body more easily.

In such a pants-type absorbent article, it is desirable that an upper end of the front leg elastic member is located below a lower end of the locking portion in the up-down direction.

According to the pants-type absorbent article described above, in the front waist member, the contraction force exhibited by the front side leg elastic member is not easily applied in the region where the lock portions are locked, which makes it possible to more easily perform the operation of locking the tab. Further, the stretchability of the front leg elastic member is less likely to be disturbed by the locking portion, so that the leg hole openings are more likely to fit the groin of the wearer in the front waistline member.

In such a pants-type absorbent article, it is desirable to provide a functional material containing at least any one of a cooling agent, a warming agent, and a fragrance in a predetermined region of at least any one of the absorbent main body and the waist member.

According to the pants-type absorbent article, a cool feeling effect, a warm feeling effect, and the like can be imparted to the wearer.

= = first embodiment = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = the second embodiment

As an example of an underpants type (pants-shaped) absorbent article according to the first embodiment of the present invention, an underpants type diaper 1 (hereinafter, also simply referred to as "diaper 1") will be explained. It should be noted that pant-type absorbent articles also include pant-type diapers, pant-type absorbent pads, and the like.

< basic Structure of diaper 1 >

Fig. 1 is a schematic perspective view of a diaper 1 according to a first embodiment. Fig. 2 is a plan view of the diaper 1 in an unfolded and extended state as viewed from the skin side in the thickness direction. Fig. 3 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A in fig. 2.

It should be noted that the "extended state" of the diaper 1 refers to a state in which the entire diaper 1 (entire product) is extended without wrinkles by extending the respective elastic members (e.g., the absorber elastic member 50, the skin side panels 22 and 23, and the like, which will be described later) included in the diaper 1, and specifically, the diaper 1 is extended to a state in which the dimensions of the constituent members (e.g., the non-skin side panels 21, the skin side panels 22 and 23, and the like, which will be described later) of the diaper 1 coincide with or are close to the dimensions of the members themselves.

As shown in fig. 1, the diaper 1 has "up-down direction", "left-right direction", and "front-back direction" orthogonal to each other. Further, as shown in fig. 3, the diaper 1 has a "thickness direction" in which members are laminated with each other. In the up-down direction, in a state where the wearer wears the diaper 1, a side corresponding to the waist of the wearer is an "upper side", and a side corresponding to the crotch of the wearer is a "lower side". Further, in the front-rear direction, the side corresponding to the wearer's abdomen during use of the diaper is the "front side", and the side corresponding to the wearer's back is the "rear side". In the thickness direction, the side in contact with the wearer's skin in the state where the diaper 1 is worn by the wearer is the "skin side", and the opposite side is the "non-skin side".

Further, in the developed state shown in fig. 2, the diaper 1 has a "longitudinal direction" and a "lateral direction" orthogonal to each other. The "longitudinal direction" is a direction along the up-down direction in the pants-type state, and the "lateral direction" is a direction along the left-right direction in the pants-type state.

The diaper 1 of the present embodiment includes: a liquid-absorbent main body 10 that absorbs excretory fluid such as menstrual blood; a waist member 20 configured to be laminated on the non-skin side of the absorbent main body 10 and configured around the waist of the wearer during use of the diaper 1; and protruding pieces 30 provided on both sides of the waistline member 20 in the left-right direction.

(absorbent body 10)

As shown in fig. 2, the absorbent main body 10 has a substantially rectangular shape in plan view, with a longitudinal direction (corresponding to the "longitudinal direction" of the absorbent main body 10 in an extended state) extending in the up-down direction of the diaper 1. Further, as shown in fig. 3, the absorbent main body 10 includes: an absorbent core 11 extending in the longitudinal direction (up-down direction); a topsheet 12 disposed on the skin side with respect to the absorbent core 11; a back sheet 13 disposed on the non-skin side with respect to the absorbent core 11. However, the absorbent main body 10 may include other sheet members. For example, a second sheet (not shown) may be disposed between the topsheet 12 and the absorbent core 11 in the thickness direction. Further, an absorber elastic member 50, which will be described later, is provided between the absorbent core 11 and the back sheet 13.

The absorbent core 11 is a member that absorbs and retains liquid such as menstrual blood, and is formed of, for example, liquid absorbent fibers (e.g., pulp fibers) mixed with a Super Absorbent Polymer (SAP). It should be noted that the outer peripheral surface of the absorbent core 11 may be covered with a liquid-permeable sheet member (core wrap sheet), such as a tissue paper or nonwoven sheet.

The topsheet 12 is a liquid-permeable sheet member that can come into contact with the wearer's skin during use of the diaper, and is formed of, for example, a hydrophilic breathable nonwoven sheet or a spunbond nonwoven sheet.

The back sheet 13 is formed to have a two-layer structure including: a liquid impermeable sheet 13a for suppressing leakage of liquid such as menstrual blood absorbed by the absorbent core 11 to the outside; and a hydrophobic sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13a. For example, a resin film or the like is used as the liquid impermeable sheet 13a, and a flexible nonwoven sheet is used as the hydrophobic sheet 13 b. However, the hydrophobic sheet 13b is not necessarily provided, and the back sheet 13 may be configured with only the liquid-impermeable sheet 13a.

Further, leakage preventing wall portions (not shown) may be provided on both sides of the absorbent main body 10 in the right and left direction. The leakage preventing wall portions are portions corresponding to so-called three-dimensional gathers. During use of the diaper 1, the leakage preventing wall portions stand up from both sides of the absorbent main body 10 in the left-right direction toward the skin side of the wearer, thereby suppressing leakage of excretory fluid such as menstrual blood to the outside of the absorbent main body 10.

As shown in fig. 2 and 3, the absorbent main body 10 of the present embodiment is provided with a plurality of absorbent body elastic members 50 that expand and contract in the longitudinal direction (vertical direction). The absorber elastic members 50 are each formed of, for example, an elastic thread, and are arranged to be elongated in the longitudinal direction (up-down direction) on the non-skin side with respect to the absorbent core 11 (in fig. 3, between the back sheet 13 and the absorbent core 11). In the diaper 1 of the present embodiment, five absorber elastic members 50 are provided at predetermined intervals in the left-right direction (see fig. 2). The elongation magnification of the absorber elastic member 50 is preferably approximately 1.4 to 3.3 times. It should be noted that the stretch ratio is represented by a value obtained by dividing the length of the elastic member in the stretched state by the length of the elastic member in the natural state. The extension ratio of the absorber elastic member 50 is set to be strong to some extent, so that the absorbent main body 10 having relatively high rigidity is easily contracted from the non-skin side in the thickness direction, and this makes it possible to fit the absorbent main body 10 to the body of the wearer during use of the diaper 1. That is, the absorbent main body 10 is pulled up toward the skin side of the wearer due to the stretchability exhibited by the absorbent elastic member 50, and therefore, the absorbent main body 10 is easily brought into close contact with the crotch of the wearer, so that leakage of excretory fluid such as menstrual blood is difficult.

(waist member 20)

The waistline member 20 is an exterior body composed of a plurality of sheet members, and the waistline member 20 includes at least a non-skin side sheet 21 and skin side sheets 22 and 23 (see fig. 3). In addition, in the following description, a portion of the waistline member 20 located on the front side (ventral side) in the longitudinal direction with respect to the longitudinal center position CL is referred to as a front waistline member 20f, and a portion of the waistline member 20 located on the rear side (dorsal side) with respect to the longitudinal center position CL is also referred to as a rear waistline member 20b. The front waist member 20f is a portion that comes into contact with the ventral side of the wearer's body during use of the diaper 1, and corresponds to the "front body" of the diaper 1. The back waist member 20b is a portion which is in contact with the back side of the wearer's body during use of the diaper 1, and corresponds to the "back body" of the diaper 1.

The non-skin side sheet 21 is a non-stretchable sheet member disposed at the position closest to the non-skin side of the diaper 1, and is formed of, for example, a spunbond nonwoven fabric, an SMS nonwoven fabric, or the like. In the present embodiment, as shown in the plan view of fig. 2, the non-skin side sheet 21 has a shape that narrows inward in the left-right direction in a longitudinal center portion (a portion including the center position CL).

The skin side sheet 22 is a stretchable sheet member which is laminated on the skin side of the non-skin side sheet 21 on the longitudinal front side (ventral side). The skin side sheet 22 is formed of, for example, a stretchable nonwoven sheet. The "stretch nonwoven fabric" is a nonwoven fabric comprising stretchable fibers having stretchability and extensible fibers having a lower contractibility than the stretchable fibers. The stretch nonwoven fabric is made by an appropriate stretching process such as gear stretching. The skin side sheet 22 of the present embodiment can use polyurethane elastomer fibers as one kind of elastic thermoplastic elastomer as the stretchable fibers, and can use polypropylene (PP) fibers as polyolefin resin as one kind of inelastic thermoplastic resin as the stretchable fibers.

The skin side sheet 22 is joined to the non-skin side sheet 21 by interspersed sheet joining portions (not shown), and therefore, the front waist member 20f is given stretchability at least in the left-right direction. In the present embodiment, the sheet joining portions are each formed using a known joining method (such as ultrasonic welding).

The skin side sheet 23 is a stretchable sheet member laminated on the skin side of the non-skin side sheet 21 on the longitudinal rear side (back side). The skin side sheet 23 has the same configuration as the skin side sheet 22. That is, the skin side sheet 23 is formed of a stretchable nonwoven sheet, and is joined to the non-skin side sheet 21 by interspersed sheet joining portions (not shown). Therefore, the back waistline member 20b is given stretchability at least in the right-left direction.

It should be noted that as the sheet member constituting the waist member 20, other sheet members than the non-skin side sheet 21 and the skin side sheets 22 and 23 may be provided. For example, the waist member 20 may have a three-layer structure in which a non-stretchable nonwoven fabric sheet is disposed on the skin side of the stretchable skin side sheets 22 and 23, and a stretchable nonwoven fabric sheet is sandwiched between the non-stretchable nonwoven fabric sheets.

The diaper 1 in the unfolded state shown in fig. 2 is folded once in the longitudinal direction (front-rear direction) at a folded position, which is a longitudinal central position CL (shown as a chain line in fig. 2), so that the skin-side surface of the front waist member 20f (front body panel) and the skin-side surface of the back waist member 20b (back body panel) face each other. In the folded state, both lateral (left-right direction) end portions 40f and 40f of the front waist member 20f overlap with both lateral (left-right direction) end portions 40b and 40b of the rear waist member 20b in the front-rear direction, and these end portions are joined using a known joining means such as seal welding or the like, thereby forming the side joint portions 40. Thus, in the folded waistline member 20 (20 f and 20 b), the front side (abdominal side) and the rear side (back side) are connected in an endless manner, and the pants-type diaper 1 is formed to have one waistline opening 1a and a pair of leg-surrounding openings 1b shown in fig. 1.

(Tab 30)

The pair of projecting pieces 30 are provided on both lateral side portions of the diaper 1. The tabs 30 each include a base piece 31 and a locking portion 32.

The base sheet 31 is a sheet member formed of a nonwoven fabric sheet or the like. The base sheet 31 is joined to the waistline member 20 at one side in the right-left direction thereof by a tab joining part 35, and has a locking part 32 at the other side in the right-left direction (see fig. 2). In the present embodiment, the side joining portion 40 of the waistline member 20 also serves as the tab joining portion 35. That is, the front waistline member 20f, the back waistline member 20b, and the tab 30 are integrally joined by the side joint 40. However, the tab engagement portion 35 may be provided separately from the side engagement portion 40. For example, in the front waist member 20f or the back waist member 20b, a configuration in which the tab 30 is joined to a predetermined area other than the side joint portions 40 by the tab joint portions 35 is acceptable. Further, the tab bonding portion 35 may be formed by ultrasonic welding or the like in the same manner as the side bonding portion 40, or may be formed using an adhesive such as a hot melt adhesive or the like.

The locking portion 32 is a locking member for detachably locking the tab 30 to the waistline member 20, and is provided in a predetermined area (an area opposite to the tab engagement portion 35 in the left-right direction) on the skin-side surface of the tab 30. In the present embodiment, the locking portion 32 is, for example, a hook-and-loop fastener which is formed of polypropylene and provided with a plurality of hook members for locking (projections for locking, not shown) on the skin-side surface thereof. These protrusions for locking are hooked to fibers (loops) of a nonwoven fabric sheet constituting the non-skin side sheet 21 provided on the outermost layer of the waist member 20, thereby detachably locking the locking portions 32 (tabs 30) to the non-skin side surface of the waist member 20. However, a configuration in which a hook member for locking is provided on the waistline member 20 side and a loop member to be hooked by the hook member is provided on the locking portion 32 side is also acceptable.

As shown in fig. 1, in the diaper 1 in the pants-type state, the locking portions 32 of the tabs 30 are locked to the front waist member 20f in a region located on the left-right direction inner side of the tab joining portions 35 (side joining portions 40).

< operations of putting on and taking off diaper 1 >

Next, the operation of putting on and taking off the diaper 1 will be explained. In the initial state, the diaper 1 is in a pants-type (pant-shaped) state as shown in fig. 1, and can be put on as a normal pants-type absorbent article. Further, when the diaper 1 is removed from the body, the waistline member 20 formed in a loop shape along the waistline of the wearer can be removed by separating the waistline member 20 into the front waistline member 20f and the back waistline member 20b and opening the diaper 1.

Fig. 4A and 4B are views showing the operation of separating the waist member 20 of the diaper 1 into the front waist member 20f and the back waist member 20B. Fig. 4A is a schematic cross-sectional view showing the diaper 1 in an underpants type state seen from above in the up-down direction (from the waist opening 1a side), and fig. 4B is a schematic cross-sectional view showing the diaper 1 in fig. 4A with the front waist member 20f and the rear waist member 20B separated.

In the diaper 1 in the pants-type state, the front waist member 20f and the rear waist member 20b are joined to each other in side joining portions 40 and 40 provided in both end portions in the left-right direction, thereby forming a ring-shaped waist opening 1a as shown in fig. 4A. Further, a pair of tabs 30 are provided in both left and right direction side portions of the waistline member 20, and the tabs 30 are locked to the non-skin side surface of the front waistline member 20f by the locking portions 32.

Further, in fig. 4A, a pair of separating portions 25 are provided on both sides of the front waistline member 20f in the left-right direction. The separating portions 25 are each a portion provided for separating the waistline member 20 formed in a loop shape along the waistline of the wearer into the front waistline member 20f and the back waistline member 20b. The separating portion 25 is provided somewhere in the left-right direction area from the side engaging portion 40 to the portion where the locking portion 32 is locked. In fig. 4A, in the left-right direction, in the area between the side engaging portion 40 and the lock portion 32, the separating portion 25 is provided at a position closer to the side engaging portion 40 than the lock portion 32. The separating portion 25 is, for example, a perforation extending in the up-down direction (see fig. 2), and by tearing the waist member 20 along the perforation, the waist member 20 can be easily separated into the front waist member 20f and the rear waist member 20b.

It should be noted that in the diaper 1, the side joining parts 40 are formed by ultrasonic welding, and therefore, the rigidity of the side joining parts 40 is higher than that of the remaining region of the waistline member 20. Therefore, the waistline member 20 can also be torn along the left-right direction inside end of the side joint portion 40 where the rigidity difference of the waistline member 20 is large. In this case, since the inner end of the side joint portion 40 functions as the separation portion 25, it is not necessary to provide a perforation or the like.

Further, in order to easily perform the separation, the separation portion 25 may be formed by connecting the front waistline member 20f and the back waistline member 20b in a separable manner in advance. For example, the lumbar member 20 may be made separable as follows: a part of the front waist member 20f and a part of the back waist member 20b are laminated in the thickness direction, and the laminated portions are weakly glued or connected by a hook and loop. Further, the waistline member 20 can be made separable as follows: the front waistline member 20f and the back waistline member 20b are connected by a predetermined connecting member, and the connecting member is removed from the connecting side.

In addition, the following configuration is also acceptable: when the joining of the tab joined portion 35 (side joined portion 40) and the base sheet 31 is maintained by weakly gluing the portion where the front waist member 20f and the base sheet 31 of the tab 30 are laminated with each other, it is easy to separate the front waist member 20f and the base sheet 31 in the separating portion 25.

The diaper 1 in which the waistline member 20 is separated into the front waistline member 20f and the back waistline member 20B in the separation portion 25 is in the state shown in fig. 4B. That is, the separating portion 25 in fig. 4A is separated into a separating end 25fe on the front waistline member 20f side and a separating end 25be on the rear waistline member 20b side, and cuts the front waistline member 20f and the rear waistline member 20b in the front-rear direction. Further, in fig. 4B, the pair of tabs 30 and 30 are joined to the rear waist member 20B by tab joining portions 35 (side joining portions 40) on both sides in the left-right direction, and the respective locking portions 32 and 32 provided on the tabs 30 and 30 are locked to the front waist member 20f. Thus, the waistline member 20 is formed in a ring shape. When the diaper 1 in this state is removed from the body of the wearer, the diaper 1 can be easily removed by unlocking the lock portion 32 from the front waistline member 20f and opening the diaper 1.

Fig. 5 is an unfolded plan view of the diaper 1 in a state where the front waist member 20f and the back waist member 20b are separated from each other. The separated diaper 1 may be used as a so-called belt-type diaper in which the tabs 30 including the locking portions 32 are provided on both sides in the left-right direction of the rear waist member 20b (back body panel). That is, the diaper 1 of the present embodiment can be used as both an underpants type diaper and a belt type diaper.

Conventional pant-type diapers have excellent fit, but are difficult to put on and take off at any time and place in a toilet or the like. For example, when a diaper is taken off after use and a new diaper is put on while going out, it is necessary to put toes into leg-hole openings of a pants-type diaper and pull the diaper up to the crotch. Therefore, there is a problem that: in an environment where it is difficult for a wearer to take off their pants or shoes, it is difficult for the wearer to put on and take off the diaper.

In contrast, according to the diaper 1 of the present embodiment, the waistline member 20 is separated by the separating portion 25, so that the diaper 1 can be easily removed. Further, by setting the diaper 1 to the developed state by separating the waistline member 20 of a new diaper 1 in advance by the separating portion 25, the diaper 1 can be used as a belt-type diaper, and this enables the diaper to be easily put on and taken off even in an environment where it is difficult for a wearer to take off their pants or shoes.

Further, in the diaper 1 of the present embodiment, even when the diaper 1 is used as a belt-type diaper, excellent fit similar to that of an underpants-type diaper can be achieved. Fig. 6 is a plan view showing a state where the diaper 1 in a belt-type state is again made into an underpants-type state and is stretched. Fig. 6 shows a state in which the diaper 1 shown in fig. 5 in an unfolded and extended state is folded once at a longitudinal (longitudinal direction) center position CL, and a pair of locking portions 32 and 32 are locked to a front waist member 20f (front body panel), formed in a pants-type.

In the diaper 1, the front waistline member 20f can be stretched in the right-left direction due to the stretchability exhibited by the skin side sheet 22 having stretchability in the right-left direction. Therefore, when the pair of locking portions 32 and 32 are locked to the front waist member 20f (front body panel) as shown in fig. 6, the region located between the locking portions 32 and 32 in the left-right direction is stretched in the left-right direction. The front waist member 20f in the state where the lock portion 32 is locked includes at least a stretchable region 20EA (indicated by a hatched portion in fig. 6), and the stretchable region 20EA is stretchable in the left-right direction at a vertical direction center position 32C of the lock portion 32.

That is, in the front waistline member 20f (front body panel), when the locking portions 32 and 32 are locked, the right-left direction contraction force is exerted on the area between the locking portions 32 and 32. Therefore, both the left and right direction end portions of the rear waistline member 20b are pulled toward the inside by the pair of locking portions 32 and 32, which makes the waistline opening 1a formed in a loop shape by the front waistline member 20f and the rear waistline member 20b more easily contracted. That is, a contractive force indicated by an arrow in fig. 4B is exerted on the front waistline member 20f, and the waistline opening 1a contracts. Therefore, the waistline opening 1a is closely fitted along the waistline of the wearer, so that positional deviation or the like is not easily caused. Therefore, even if the diaper 1 is used in either of the pants-type form and the belt-type form, excellent fit can be achieved.

Further, the absorbent main body 10 of the diaper 1 is provided with an absorber elastic member 50 which expands and contracts in the longitudinal direction (longitudinal direction). As described above, during use of the diaper 1, the absorber elastic members 50 contract and pull up the absorbent main body 10 toward the skin side of the wearer, which makes it possible to improve the fit and absorbency of the crotch portion. That is, in the present embodiment, due to the stretchability of the absorber elastic members 50, the fitting property of the absorbent main body 10 to the crotch portion of the wearer can be enhanced, and due to the stretchability of the stretchable region 20EA, the fitting property of the waistline member 20 to the waistline portion of the wearer can be enhanced. This therefore makes it possible to enhance the fit of the entire diaper 1.

Further, the width W20EA in the left-right direction of the stretchable zone 20EA provided in the front waistline member 20f is larger than the width W50 in the left-right direction of the absorber elastic member 50 provided in the absorbent main body 10 (see fig. 6). Here, as shown in fig. 6, the lateral width W50 of the plurality of absorber elastic members 50 is represented by the distance between the absorber elastic member 50 disposed at one side (for example, the left side) in the lateral most direction and the absorber elastic member 50 disposed at the other side (for example, the right side) in the lateral most direction among the absorber elastic members 50. In such a configuration, the range of the contractive force exhibited by the stretchable zone 20EA and exerted on the front waistline member 20f is larger than the range of the contractive force exhibited by the absorber elastic member 50 and exerted on the absorbent main body 10 in the left-right direction. Therefore, even if the upper end portion of the absorbent main body 10 is pulled down by the contractive force of the absorber elastic member 50, the contractive force exhibited by the stretchable region 20EA can more easily resist the tensile force exhibited by the absorber elastic member 50, so that the front waistline member 20f is not easily pulled down. This therefore makes it easier to maintain excellent fit of the diaper 1.

Further, the width W20EA in the left-right direction of the stretchable zone 20EA is larger than the width W11 in the left-right direction of the absorbent core 11 (the maximum width of the absorbent core 11) (see fig. 6). That is, in the left-right direction, the range in which the contractive force exhibited by the stretchable zone 20EA is applied is larger than the width of the absorbent core 11. Therefore, even if the entire absorbent core 11 in the left-right direction is pulled down by the contractive force of the absorber elastic members 50, the front waist member 20f is not easily pulled down because the contractive force exhibited by the stretchable region 20EA more easily resists the tensile force exhibited by the absorbent core 11. Therefore, this makes it easier to further maintain the excellent fit of the diaper 1.

Further, the width W20EA in the left-right direction of the stretchable and contractible region 20EA is larger than the width W10 in the left-right direction of the absorbent main body 10 (see fig. 6). That is, in the left-right direction, the range in which the contraction force exhibited by the stretchable area 20EA is applied is larger than the maximum width of the absorbent main body 10. Therefore, even if the contractive force of the absorber elastic members 50 pulls down the entirety of the absorbent main body 10 in the left-right direction, the front waistline member 20f is not easily pulled down because the contractive force exhibited by the stretchable region 20EA more easily resists the tensile force exhibited by the absorbent main body 10. Therefore, this makes it easier to further maintain the excellent fit of the diaper 1.

As shown in fig. 6, the upper end 50et of the front side (ventral side) of the absorber elastic member 50 is located below the lower end 20EAeb of the expansion and contraction region 20EA in the vertical direction. That is, the region to which the contraction force exerted by the absorber elastic member 50 is exerted does not overlap the stretchable region 20EA, and therefore the contraction force exerted by the absorber elastic member 50 is not easily exerted on the stretchable region 20 EA. In such a configuration, the contractive force exhibited by the absorber elastic members 50 does not easily interfere with the stretchable region 20EA, so that the front waistline member 20f is not easily flexed or the like. Therefore, when the lock portions 32 are locked to the front waist member 20f during use of the diaper 1 in the belt-type state, the front waist member 20f is easily kept in a flat state, enabling the lock portions 32 to be more easily and firmly locked. This therefore makes it possible to further enhance the fit of the diaper 1 in the waistline portion of the wearer.

As shown in fig. 6, the upper end 50et of the front side (ventral side) of the absorber elastic member 50 is located below the lower end 25eb of the separating portion 25 (the separating end 25fe of the front waistline member 20 f) in the vertical direction. That is, the region to which the contraction force exhibited by the absorber elastic member 50 is applied does not overlap with the region between the pair of separation portions 25 and 25, and therefore, the contraction force exhibited by the absorber elastic member 50 is not easily applied to the region between the separation portions 25 and 25. In such a configuration, the contractive force exhibited by the absorber elastic member 50 does not easily interfere, so that flexing or the like does not easily occur in the region between the separation portions 25 and 25 of the front waistline member 20f. Therefore, in the diaper 1 in the pants-type state, it is possible to make it easier to separate the separation portion 25 (thereby separating the front waistline member 20f and the back waistline member 20 b). For example, when the separating portion 25 is a perforation, the perforation can be stably broken. This therefore makes it possible to easily put on and take off the diaper 1 while going out or the like.

Further, it is desirable that the lock portions 32 are positioned in the regions located on the left-right direction outer sides of the absorber elastic members 50 and located on the left-right direction inner sides of the side joining portions 40 of the waistline member 20 in the state where the lock portions 32 are locked to the waistline member 20. As shown in fig. 6, the lock portion 32 is locked to the inside area in the left-right direction of the waistline member 20 (front waistline member 20 f). At this time, assuming that the locking portion 32 is locked to the region overlapping the absorber elastic member 50 with respect to the left-right direction, the region may be pulled downward by the contractive force of the absorber elastic member 50. Therefore, there is a possibility that it is difficult to stably perform the locking operation. In contrast, if the lock portions 32 are locked to the region located on the left-right direction outer side of the absorber elastic member 50 and on the left-right direction inner side of the side joint portions 40, the contraction force exhibited by the absorber elastic member 50 does not easily affect the region, enabling the lock portions 32 to be more easily and firmly locked. Thus, this makes it possible to further improve the fit of the waistline member 20 in the waistline of the wearer.

Further, it is desirable to provide portions where both the left and right direction end portions 10s and 10s of the absorbent main body 10 and the stretchable region 20EA overlap each other. In other words, it is desirable that at least a part of both end portions 10s of the absorbent main body 10 overlap the stretchable region 20EA with respect to the up-down direction. In this configuration, the left and right direction end portions 10s of the absorbent main body 10 are easily pulled toward the left and right direction outer sides due to the stretchability of the stretchable region 20 EA. That is, a force to expand the absorbent main body 10 is applied, which makes it easier to suppress leakage of excrement, and makes it less likely that the absorbent main body 10 rises from the body of the wearer, enabling the absorbent main body 10 to be more easily brought into close contact with the skin of the wearer. This therefore makes it possible to further enhance the fit of the absorbent main body 10 during use of the diaper 1.

Further, it is desirable that the entire locking portion 32 overlaps with the expansion region 20EA with respect to the up-down direction. In such a configuration, the contractive force exhibited by the stretchable zone 20EA is exerted on the lock portions 32 as a whole in the up-down direction, which makes it easy to pull the rear waistline member 20b toward the left-right direction inside by the pair of lock portions 32 and 32, so that the fit of the waistline opening 1a to the waistline of the wearer can be further improved. In the present embodiment, as shown in fig. 6, the entire lock portion 32 in the vertical direction overlaps the stretchable region 20EA, and therefore the fit of the waistline of the wearer can be sufficiently improved during use of the diaper 1.

Further, it is desirable that the lower end 32eb of the lock portion 32 is located above the upper end 11et of the absorbent core 11 in the up-down direction. In other words, it is desirable not to provide a portion where the locking portion 32 and the absorbent core 11 overlap each other with respect to the up-down direction. Since the absorbent core 11 contains Super Absorbent Polymer (SAP) or the like, the rigidity of the absorbent core 11 is higher than that of the waist member 20. Therefore, assuming that the absorbent core 11 exists between the pair of locking portions 32 and 32 locked to the waistline member 20, there is a risk that the left-right directional expansion and contraction of the expansion and contraction region 20EA is hindered by the rigidity of the absorbent core 11, so that a contraction force does not easily act between the pair of locking portions 32 and 32. In this case, the contractive force of the waistline opening 1a becomes weak, so that the fit to the waistline of the wearer deteriorates. In contrast, in the diaper 1, as shown in fig. 6, the lower ends 32eb of the lock portions 32 are located above the upper ends 11et of the absorbent core 11 in the up-down direction, which suppresses the absorbent core 11 from hindering the expansion and contraction of the expansion and contraction region 20EA in the region between the lock portions 32 and 32. Therefore, this makes it possible to easily maintain excellent fit of the waistline member 20.

Further, it is desirable that, in the diaper 1 in the developed and extended state as shown in fig. 6, the right-left direction contraction force of the stretchable region 20EA in the portion overlapping with the absorbent main body 10 when seen in the thickness direction is smaller than the right-left direction contraction force of the stretchable region 20EA in the portion not overlapping with the absorbent main body 10 when seen in the thickness direction. In the waistline member 20, in the case where an excessive contraction force is applied to the region overlapping with the absorbent main body 10 in the thickness direction, the absorbent main body 10 having high rigidity undulates and causes a risk that the diaper does not easily fit the wearer's body surface. Therefore, in the region of the stretchable region 20EA overlapping the absorbent main body 10, for example, by cutting a part of the skin side sheets 22 and 23 (stretchable nonwoven fabric), the left-right direction contractive force is made smaller than that in the region not overlapping the absorbent main body 10. This suppresses excessive contraction force from being exerted on the absorbent main body 10, so that fit around the entire waistline can be easily maintained. It should be noted that the magnitude of the leftward and rightward contraction force of the expansion and contraction region 20EA means the magnitude of the force acting when the target region in the expansion and contraction region 20EA is expanded by a unit length in the leftward and rightward direction.

Further, in the diaper 1 of the present embodiment, the tab 30 having the lock portion 32 is joined to the waistline member 20 at the outside in the left-right direction of the lock portion 32 by the tab joining portion 35. Therefore, a user (wearer) of the diaper 1 can easily lock the locking portions 32 to the lumbar member 20 or unlock from the lumbar member 20 by grasping the portions of the tabs 30 where the locking portions 32 are provided. Further, the locking portions 32 are each provided with a hook member for locking or a loop member for hooking the hook member, and this makes it possible to repeatedly attach and detach the locking portion to and from the non-skin-side surface of the lumbar member 20. Therefore, this enables the locking position to be easily adjusted during the operation of the locking portion 32. With these configurations, it is easy to connect or adjust the front waistline member 20f and the back waistline member 20b, so that the waistline opening 1a fits more easily around the waistline of the user (wearer).

Further, the tab engaging portion 35 is provided at any position from the outer end of the absorbent main body 10 to the side engaging portion 40 of the waist member 20 in the left-right direction. The separating portion 25 is arranged in the region between the tab engaging portion 35 and the locking portion 32 in both the left and right directions. In the diaper 1 of the present embodiment, as shown in fig. 4, the tab engaging portion 35 is provided at the same position as the side engaging portion 40, and the separating portion 25 is arranged between the tab engaging portion 35 and the locking portion 32 in both the left and right directions. Therefore, when the user separates the separated portions 25, the respective separated portions 25 can be easily separated by grasping the tab 30 with one hand, grasping the waist member 20 (front waist member 20 f) with the other hand, and pulling in the opposite direction. For example, in fig. 4A, by holding the front waistline member 20f with one hand and pulling the tab 30 (locking portion 32) toward the non-skin side with the other hand, force is concentrated on the separating portion 25, so that the waistline member 20 can be easily torn. Therefore, this makes it possible to easily perform an operation of removing the diaper 1 from the body of the wearer or deforming the diaper from an underpants type diaper to a belt type diaper.

Further, as shown in fig. 2, the front waistline member 20f is provided with a front leg elastic member 28 extending along the lower end edge portion in the up-down direction (i.e., the outline of the leg hole opening 1 b). The front leg elastic members 28 are each an elastic member such as an elastic thread, and are disposed between the non-skin side sheet 21 and the skin side sheet 22 in the thickness direction in a state of being stretched from one side in the left-right direction to the other side in the left-right direction (see fig. 2, fig. 3, and the like). In the same manner, a rear side leg elastic member 29 extending along the lower end edge portion in the up-down direction (i.e., the outline of the leg hole opening 1 b) is provided in the rear waistline member 20b. The rear leg elastic members 29 are each an elastic member such as an elastic thread, and are disposed between the non-skin side sheet 21 and the skin side sheet 23 in the thickness direction in a state of being elongated from one side in the left-right direction to the other side in the left-right direction (see fig. 2, fig. 3, and the like).

By providing these leg elastic members 28 and 29, stretchability is imparted along the leg-surrounding opening 1b of the diaper 1, and the leg-surrounding opening 1b is easily fitted around the legs of the wearer. In particular, in the rear waistline member 20b, the leg hole openings 1b are liable to be lifted off or displaced from the wearer's body (buttocks) due to the projection of the buttocks of the wearer or the influence of the movement of the legs of the wearer. Therefore, by providing the rear leg elastic member 29 which extends and contracts along the leg hole openings 1b, the fit of the rear waist member 20b around the legs on the hip side of the wearer is improved, and discomfort or discomfort can be made less likely to occur to the wearer.

In order to make such an effect easy to occur, it is desirable that at least the rear leg elastic member 29 is continuously arranged in the left-right direction in a region from the side joining portion 40b of the rear waist member 20b to the outer end portion 10s of the absorbent main body 10. In the present embodiment, the rear leg elastic member 29 is provided continuously from the side joining portion 40b on one side in the left-right direction to the side joining portion 40b on the other side in the left-right direction (see fig. 2). Therefore, this makes it possible to further improve the fit in a wide range around the legs on the hip side of the wearer.

In addition, in the diaper 1, it is desirable that the stress in the stretchable region 20EA in the stretchable direction (left-right direction) be greater than the stress in the stretchable direction (up-down direction) in the region where the absorber elastic member 50 is disposed. Here, the measurement of the stress of the expansion and contraction region 20EA can be performed as follows using, for example, an Autograph type tensile tester (for example, AG-1KN 1) manufactured by shimadzu corporation. First, the front waist member 20f of the diaper 1 is elongated to such an extent that gathers due to the contraction action of the skin side sheet 22 are eliminated on the surface of the front waist member 20f, and in this state, the widthwise dimension of the stretchable zone 20EA is measured. Subsequently, the sample is obtained by cutting the expansion region 20EA by this size using a cutter. Next, one side end of the sample is sandwiched between the fixed chucks and the other side end is sandwiched between the movable chucks. After the sample was elongated to a length of about 90% of the original size at a speed of 300mm/min, the sample was inverted, and then a tensile load (N) was obtained when the sample was contracted to a length of about 75% of the original size. Thus, the tensile load is converted into stress per unit length (mm) (N/mm) and used as the stress. The stress of the region where the absorber elastic member 50 is disposed can also be measured in a similar manner by cutting out a predetermined portion of the absorbent main body 10 to obtain a sample.

It should be noted that the elasticized region 20EA and the absorbent elastic member 50 may be compared using a "stretch coefficient". That is, the stretch coefficient in the stretching direction (left-right direction) of the stretchable region 20EA may be larger than the stretch coefficient in the stretching direction (up-down direction) of the region in which the absorber elastic member 50 is disposed. It should be noted that the stretch coefficient is a coefficient that determines the ease of stretching of each portion in its current state. For example, the stretch coefficient can be calculated by the following method.

First, a portion to be measured (a portion including the stretchable region 20EA and the absorber elastic member 50) is cut out from a product to be measured (the diaper 1) as a sample in the same manner as described above. Next, the cut samples were left in their natural state for 60 minutes in an atmosphere of 60RH at 20 ℃ without applying a tensile load. Then, a line L orthogonal to the stretching direction is drawn at the widthwise central position along the stretching direction of each sample, and the length of the line L in a natural state is measured. At this time, the line L is drawn at a position on the horizontal stage stand and as little load as possible is applied to the sample, and the length of the line L is measured. Here, the length of the line L is defined as an initial length "a". Further, in order to reduce the measurement error, it is preferable to draw the line L in the sample as long as possible, but it is necessary not to place the line L at a portion to be gripped by the chuck of the next tensile tester. Next, both ends of the sample in the stretching direction were held in a tensile tester (such as Autograph manufactured by shimadzu corporation) and the sample was stretched until a load of 0.8N was applied. Then, the length of the line L at the time of elongation is measured and the length of the line L in such a state is defined as "a'". For example, in a tensile tester, a sample is pulled in its expansion and contraction direction (vertically upward with respect to a horizontal plane) at a tensile speed of 100 mm/min. From these measured values, the elongation magnification can be calculated by the following equation.

Stretch ratio = (A' -A)/A

In the diaper 1, in the case where the stress (or the stretch coefficient) of the stretchable region 20EA is larger than the stress (the stretch coefficient) of the absorber elastic member 50, the force exerted by the stretchable region 20EA to contract the waistline member 20 (front waistline member 20 f) in the left-right direction is more likely to be stronger than the force exerted by the absorber elastic member 50 to pull down the upper end portion of the absorbent main body 10. Therefore, the positional deviation of the waistline member 20 is less likely to occur against the force of the absorber elastic member 50 pulling the upper end portion of the absorbent main body 10 downward in the up-down direction. Thus, this makes it possible to easily maintain the fit of the waistline member 20 around the waistline of the wearer.

= = second embodiment = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = the second embodiment

In the second embodiment, an underpants type diaper 2 (hereinafter, also simply referred to as "diaper 2") including a low stretch region 20NA whose stretchability is lower than that of the stretchable region 20EA in the waist member 20 is explained below. Fig. 7 is a plan view of the diaper 2 in an unfolded and extended state as viewed from the skin side in the thickness direction.

The basic configuration of the diaper 2 is substantially the same as that of the diaper 1 of the first embodiment. Namely, the diaper 2 includes: a liquid-absorbent main body 10; and a waist member 20 disposed on the non-skin side of the absorbent main body 10. On the other hand, in at least the front waist member 20f, the diaper 2 includes a low stretch region 20NA, and the stretchability of the low stretch region 20NA is lower than that of the stretch region 20EA formed by the stretchable skin side sheet 22. The low expansion and contraction region 20NA is located outside the expansion and contraction region 20EA in the left-right direction and adjacent to the expansion and contraction region 20 EA. In other words, the low expansion and contraction region 20NA is disposed outside the expansion and contraction region 20EA in the left-right direction, and is located at a position overlapping the expansion and contraction region 20EA with respect to the up-down direction (see the hatched portion in fig. 7).

In the diaper 2, each low stretch region 20NA is formed, for example, by performing a process for making a predetermined region of the skin side sheet 22 non-stretchable. Therefore, the front waist member 20f has the right-and-left directional stretchability in the stretchable region 20EA, and has no stretchability or extremely low stretchability in the low stretchable regions 20NA located on both sides in the right-and-left direction.

When the front waistline member 20f is in the natural state or the worn state, in the extensible region 20EA, the skin side sheet 22 is contracted in the left-right direction, and the non-skin side sheet 21 is not easily contracted. Therefore, a plurality of fine wrinkles extending in the up-down direction are formed on the non-skin-side surface. On the other hand, in the low stretch region 20NA, since both the skin side sheets 22 and the non-skin side sheets 21 do not easily contract, wrinkles are not easily formed on the surface. Therefore, in the low stretchable region 20NA of the front waistline member 20f, the shape retaining ability of the sheet member is more easily ensured than in the stretchable region 20 EA. Therefore, for example, when the lock portion 32 that has been locked to the front waist member 20f is unlocked in a state where the diaper 2 is put on, it is easy to suppress flexure or distortion of the sheet member (waist member 20) in the vicinity of the low stretch region 20NA. Therefore, this makes it easier to smoothly unlock the lock portion 32 from the front waistline member 20f. Further, in the case where a used diaper 2 is replaced with a new diaper 2 in a restroom when going out, it is easier to ensure the shape retaining ability of the front waist member 20f near the low stretch region 20NA, so that the locking portion 32 can be easily locked to that region.

It should be noted that in the case where the low stretch region 20NA is formed by performing the process for making the sheet member (e.g., the nonwoven fabric sheet) non-stretchable as described above, the fibers (loop members) of the nonwoven fabric are hardened in this region, and this makes it difficult for the surface of the locking portion 32 to engage with the hook-and-loop fastener (hook member). Therefore, in the waistline member 20 of the diaper 2, as shown in fig. 7, the low stretch region 20NA is configured so that the region locked by the lock portion 32 and the low stretch region 20NA do not overlap. In other words, the ranges of the expansion and contraction area 20EA and the low expansion and contraction area 20NA are set so that the locking portions 32 are each locked to an area other than the low expansion and contraction area 20NA. However, the locking part 32 may be locked to the low expansion and contraction area 20NA, and the locking part 32 and the low expansion and contraction area 20NA (non-expansion and contraction area) may overlap.

Further, in the case where the lumbar member 20 includes the stretchable region 20EA and the low stretchable region 20NA, it is desirable that the length (width) in the left-right direction of the stretchable region 20EA is longer than the length (width) in the left-right direction of the low stretchable region 20NA. In the diaper 2, in the same manner as the diaper 1, the waistline member 20 has stretchability in the region between the pair of locked locking portions 32 and 32 in the left-right direction, and this makes it possible to enhance the fit around the waistline of the wearer. At this time, in the case where the width of the low stretchable region 20NA is wider than the width of the stretchable region 20EA, there is a risk that the region of stretchability imparted to the waistline member 20 becomes small and sufficient fit cannot be obtained. On the other hand, in the diaper 2, as shown in fig. 7, the width in the left-right direction of the stretchable region 20EA is wider than the width in the left-right direction of the low stretchable region 20NA, and sufficient stretchability is imparted to the waist member 20 (front waist member 20 f). This thus makes it possible to enhance the fit of the diaper 2.

Further, as shown in fig. 7, the separating portion 25 is provided in each of the low expansion and contraction areas 20NA, and thus the separating operation of the separating portion 25 can be easily performed. For example, in the case where the separating portion 25 is a perforation as described above, a force for tearing the perforation is easily applied to the sheet member constituting the waistline member 20 in the low stretch region 20NA which is not easily stretchable. This enables the separation portion 25 to be easily separated.

= other characteristics relating to the diapers 1 and 2 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = the diaper 1 and 2, respectively

In addition to the features described above, the diapers 1 and 2 have the following features.

In the front waist member 20f (front body panel) of the diaper 1 and the diaper 2, when the locking portions 32 and 32 are locked, the expansion region 20EA is provided over the entire region located between the pair of right and left direction locking portions 32 and 32 (see fig. 6 and the like). That is, the expansion and contraction region 20EA is provided not only at the up-down direction center position 32C of the lock portion 32, but also the expansion and contraction region 20EA is provided so as to continuously extend in the left-right direction over the entire rectangular region as follows: the rectangular area is from the upper end 32et to the lower end 32eb of the lock portion 32 in the up-down direction, and is located between the pair of lock portions 32 and 32 in the left-right direction (between the left-right direction inner ends of the lock portions 32 and 32).

Therefore, the entire rectangular area sandwiched between the pair of right and left locking portions 32 and the locking portions 32 is contracted in the right-left direction, so that both right-left direction end portions of the rear waistline member 20b (back body panel) are more easily pulled toward the inside by the pair of locking portions 32 and 32. Therefore, the waistline opening 1a contracts and becomes more easily fitted along the waistline of the wearer, so that positional deviation does not easily occur.

Further, in the absorber elastic member 50 provided to the absorbent main body 10, the length of the rear side (back side) in the front-back direction of the diapers 1 and 2 is longer than the length of the front side (stomach side). In fig. 5, in the longitudinal direction (longitudinal direction) of the diaper 1 in an unfolded and extended state, the length L50b of the absorber elastic member 50 on the rear side (back side) with respect to the center position CL is longer than the length L50f of the absorber elastic member 50 on the front side (stomach side) (L50 b > L50 f).

During use of the diaper 1 or 2, the region on the rear side in the front-rear direction with respect to the center position CL is a portion located at the wearer's buttocks, and therefore, if the absorbent main body 10 is not fitted along the seam in the buttocks, there is a risk that excretory fluid such as menstrual blood or the like leaks to the outside of the absorbent main body 10 along the seam in the buttocks. In this regard, as shown in fig. 5, by increasing the length L50b of the rear side of the absorber elastic member 50 in the longitudinal direction (longitudinal direction), it is possible to cause the contraction force exhibited by the absorber elastic member 50 to be applied to the rear side of the absorbent main body 10 in a wide range. That is, the absorbent main body 10 is pressed against the wearer's body side due to the contractive force exhibited by the absorber elastic members 50, and the absorbent main body 10 is easily fitted closely to the seams of the buttocks. Therefore, this makes it possible to further enhance the fit of the diapers 1 and 2, and makes it difficult for excretory fluid such as menstrual blood to leak.

Further, in the up-down direction of the back waist member 20b (back body panel) of the diapers 1 and 2, the back side end 50eb (back side upper end) of the absorber elastic member 50 is located above the lower end 30eb of the tab 30 (see fig. 5). That is, the region where the pair of tabs 30 and 30 is arranged with respect to the up-down direction of the back waist member 20b (back body panel) is arranged so as to at least partially overlap the region where the stretchability exhibited by the absorbent elastic member 50 is applied. In such a configuration, when the tabs 30 and 30 of the back waist member 20b are pulled toward the left and right direction both sides outside during use of the diaper 1 or 2, the force of pulling the tabs 30 and 30 also acts on the absorber elastic members 50. Therefore, when the wearer performs an operation of grasping the tabs 30 and pulling them in the left-right direction to lock them to the front waistline member 20f side, the rear upper end portions (including the rear side ends 50 eb) of the absorber elastic members 50 are pulled in the left-right direction. This makes the rear region of the absorbent main body 10 less likely to slide down, and makes the absorbent main body 10 fit easily into the furrows of the wearer's buttocks due to the contractive force of the absorber elastic member 50.

As shown in fig. 5, the left-right direction length W28 of the front leg elastic member 28 disposed along the lower end portion (the contour of the leg hole 1 b) of the front waistline member 20f is shorter than the left-right direction length W29 of the rear leg elastic member 29 disposed along the lower end portion (the contour of the leg hole 1 b) of the rear waistline member 20b (W28 < W29). In other words, in the diapers 1 and 2, the range in which the right-left direction contractive force exhibited by the front leg elastic members 28 is applied in the front waist member 20f is narrower than the range in which the right-left direction contractive force exhibited by the rear leg elastic members 29 is applied in the rear waist member 20b. In the case of fig. 5, in the rear waist member 20b, the contractive force of the rear leg elastic member 29 is applied in the entire region in the left-right direction, while in the front waist member 20f, regions where no contractive force exhibited by the front leg elastic member 28 is applied are provided in both left-right direction end portions.

By making both the left and right direction end portions of the front waistline member 20f less likely to contract, the operation of locking the tabs 30 provided at the left and right direction end portions of the rear waistline member 20b can be easily performed by grasping the left and right direction end portions of the front waistline member 20f when putting on the sanitary napkin 1 or 2. That is, the edges formed in the left and right direction end portions of the front waist member 20f are grasped, which makes it easier to perform the operation of putting on the diaper 1 or 2, so that the body can be fitted more easily.

Further, as shown in fig. 2 and 6, in a state where the locking portions 32 of the tabs 30 are locked to the front waist member 20f, the front leg elastic members 28 are arranged below the locking portions 32. That is, the upper end of the front leg elastic member 28 is positioned below the lower end 32eb of the lock portion 32 in the up-down direction. Therefore, in the front waist member 20f, the contractive force exhibited by the front side leg elastic members 28 is not easily exerted in the region where the lock portions 32 are locked, so that the operation of locking the tabs 30 to the front waist member 20f can be performed more easily when the diaper 1 or 2 is put on. Further, in the state where the tab 30 is locked to the front waistline member 20f, the stretchability of the front leg elastic members 28 is less likely to be disturbed by the lock portion 32, so in the front waistline member 20f, the leg hole openings 1b are more likely to fit the groin of the wearer. This therefore enables the fit of the diapers 1 and 2 to be enhanced.

Further, functional materials such as a cooling agent, a warming agent, and a perfume may be provided in the absorbent main body 10 or the waist member 20 of the diapers 1 and 2. For example, by providing a cooling agent in a predetermined region on the skin-side surface or the non-skin-side surface of the skin side sheet 12 constituting the absorbent main body 10, it is possible to impart a cooling sensation or the like to the wearer during use of the diaper 1 or 2.

In the case of using a psychrotolerant as the functional material, a psychrotolerant known in the art may be used, but is preferably volatile and acts on a receptor activation channel (TRPM 8) in cutaneous nerves. Examples include menthol (e.g., L-menthol) and derivatives thereof (e.g., menthyl lactate), methyl salicylate, camphor, cucumber extracts, and essential oils derived from plants (e.g., mint, eucalyptus, nutmeg).

Similarly, in the case of using a temperature sensitive agent as the functional material, a temperature sensitive agent known in the art may be used. Examples thereof include capsaicin, capsaicin (LD 50:47mg/kg, molecular weight: 305), capsaicinoids (such as dihydrocapsaicin, nordihydrocapsaicin, homodihydrocapsaicin, homocapsaicin and synthetic capsaicin), capsanthin, benzyl nicotinate (LD 50:2,188mg/kg, molecular weight: 213), β -butoxyethyl nicotinate, N-acyl vanillylamide, vanillylnonanoate, polyol, paprika, capsicum tincture, capsicum extract, vanillyl pelargonate, vanillyl alkyl ether derivatives (vanillyl ethyl ether, vanillyl butyl ether (LD 50:4,900mg/kg, molecular weight: 210), vanillyl pentyl ether, vanillyl hexyl ether), isovanillyl alcohol alkyl ether, ethyl vanillyl alcohol alkyl ether, veratryl alcohol derivatives, substituted benzyl alcohol alkyl ether derivatives, vanillin propylene glycol acetal, ethyl vanillin propylene glycol acetal, ginger extract, ginger oil, gingerol (50: LD 250mg/kg, molecular weight: 294), zingiberone and a combination thereof.

Likewise, in the case of using a perfume as the functional material, a perfume well known in the art may be used. For example, a fragrance having a green herbaceous plant type fragrance (green herbaceous plant-like fragrance) can be used. A green plant-like scent is a type of scent that includes a green plant-like scent (green notes) or an herbal-like scent (herbal notes). The green plant-like aroma represents a refreshing aroma type such as grass or young leaves. Herbal-like flavors (herbal notes) are types of flavors that have the characteristics of the natural herbal notes in which the herbs are used. Perfume compositions containing perfumes having a green herbal plant-like fragrance preferably contain one or more perfumes selected from the group consisting of cis-3-hexenol, cis-3-hexenyl formate, cis-3-hexenyl acetate, cis-3-hexenyl propionate, cis-3-hexenyl butyrate, trans-2-hexenal, trans-2-hexenyl acetate, hexyl acetate, storax acetate, 2-methyl-3- (3, 4-methylenedioxyphenyl) -propanal (IFF name: helional), 3 (4) - (5-ethylbicyclo [2, 1] heptyl-2) -cyclohexanol, 2-pentoxy-allyl glycolate (IFF name: allyl amyl glycolate), 4-methyl-3-decene-5-ol (Givaudan name: methyldecenol (Undecavertol)), hexanal, 2, 4-dimethyl-3-cyclohexenylformaldehyde (IFF name: ligustral (Tripral)) and phenylacetaldehyde.

Further, these functional materials may be used as a core material to be disposed in a state of being encapsulated in a water-disintegrable microcapsule. The water-disintegrable microcapsules mean capsules having a diameter of 1 μm to 1,000 μm and having a space for containing a core material (cold-feeling component). The outer shape of the capsule is not particularly limited as long as it can contain and control the release of the core material, and examples of the outer shape include spherical shape, amorphous shape, and the like. The capsule may be a single-core capsule having one space for holding a core material, a multi-core capsule having a plurality of spaces for holding a core material, or a matrix-type capsule (matrix capsule) having a structure in which a microparticle-shaped core material is dispersed inside particles and a structure in which a liquid core material is impregnated. Examples of the shape of the space include a spherical shape, an amorphous shape, and the like.

In the microcapsule, a film material (wall material) encapsulating (or containing) a core material is changed by a chemical stimulus, thereby releasing an ingredient encapsulated (or contained) therein. Examples of chemical stimuli include contact between a liquid (aqueous solution) such as a body fluid and the wall material of the microcapsule. By applying these chemical stimuli to the wall material of the microcapsules, the wall material can be disintegrated. As a result, the release of the core material (functional material) in the microcapsule can be started, or if the core material is gradually released before the stimulation, the degree of release can be promoted.

It should be noted that such microcapsules are commercially available, and one example thereof is INCAP (trademark) commercially available from Symrise corporation. Further, the microcapsules may be produced by dissolving the constituent materials of the microcapsules in water to form an aqueous solution, mixing the cold feeling component and the surfactant with the aqueous solution, and spraying the aqueous solution while drying under reduced pressure. Further, as the microcapsule, a water-disintegrable microcapsule is exemplified, but a microcapsule in which a functional material is encapsulated in cyclodextrin or the like can be used.

= other = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

The above embodiments have been described in order to facilitate understanding of the present invention, and are not to be construed as limiting the present invention. The present invention may be modified or improved in various ways without departing from the gist of the present invention, and the present invention includes equivalents thereof.

In the above embodiment, by using stretchable sheets (for example, stretchable nonwoven fabric) as the skin side sheets 22 and 23 constituting the waist member 20, stretchability in the left-right direction of the waist member 20 is imparted. Other extensible members may be provided in the lumbar member 20. For example, as shown in fig. 2, a configuration is acceptable in which a waist elastic member 27 such as an elastic thread or the like is provided in the upper end portions of the front and rear waist members 20f and 20b so as to be stretchable in the left-right direction. By providing the waistline elastic member 27, the fit of the waistline opening 1a is further improved, and this makes it possible to suppress the positional deviation of the waistline member 20 during the use of the diaper 1.

Further, when the waist elastic members 27 are provided in the waist member 20, at least some of the waist elastic members 27 may be disposed to overlap both of the skin side panels 22 and 23. By doing so, the fit of the diaper 1 in the waistline of the wearer can be further improved by the left-right directional stretchability exhibited by the waistline elastic member 27 in cooperation with the left-right directional stretchability exhibited by the skin side panels 22 and 23.

In the above embodiment, the following example is explained: in the diapers 1 and 2 in the belt-type state after the waist member 20 is separated using the separating portion 25, the tab 30 is joined to the rear waist member 20b (back body panel) side, and the locking portion 32 is locked to the front waist member 20f (front body panel). The configuration of the tab 30 is not limited thereto. For example, in a state after the separation of the waistline member 20, the tab 30 is provided on the front waistline member 20f (front body panel) side, and a configuration in which the lock portion 32 is locked to the back waistline member 20b (back body panel) is acceptable. As shown in fig. 2 and the like, since the stretchable skin side sheet 23 is provided on the back waist member 20b, the back waist member 20b further includes a stretchable region similar to the stretchable region 20EA of the front waist member 20f. Therefore, even when the pair of locking portions 32 and 32 are locked to the back waistline member 20b, the region between the locking portions 32 and 32 has stretchability, so that the fit around the waistline of the wearer can be enhanced.

In the above embodiment, the example in which the pair of locking portions 32 are provided on both sides in the left-right direction has been described, but a plurality of pairs of locking portions 32 may be provided. For example, a pant-type absorbent article in which two pairs of locking portions 32 are provided by arranging the two locking portions 32 so as to be spaced apart from each other in the up-down direction is acceptable. In this case, if the stretchable region is provided at the vertically central position of any one of the pairs of locking portions, the waistline opening is easily contracted between the locking portions, and this enables excellent fit as described above.

Description of the reference numerals

1: a diaper (pants-type absorbent article) (first embodiment),

1a: waistline opening, 1b: the openings of the leg circumference are arranged on the leg circumference,

2: a diaper (pants-type absorbent article) (second embodiment),

10: an absorbent main body having a plurality of absorbent layers,

11: an absorbent core having a first surface and a second surface,

12: the front surface of the dough sheet is provided with a dough cover,

13: back sheet, 13a: liquid-impermeable sheet, 13b: a hydrophobic sheet having a hydrophobic surface and a hydrophobic surface,

20: a waist-waist component which is composed of a waist-waist component,

20f: a front waist member having a front waist region and a rear waist region,

20b: a back waist member,

20EA: telescoping region, 20NA: low expansion area

21: non-skin side sheet, 22: skin side sheet, 23: a skin side piece which is provided with a plurality of holes,

25: separation section, 25fe: split end, 25be: the separation end is provided with a plurality of separation holes,

27: waist elastic member, 28: front leg elastic member, 29: an elastic member for the rear leg portion,

30: a protruding piece is arranged on the bottom of the groove,

31: substrate, 32: locking portion, 35: a tab-engaging portion which is engaged with the tab,

40: side joint, 40f: end, 40b: the end part of the connecting rod is provided with a connecting rod,

50: an elastic member of the absorbent body,

CL: central location

Claims (25)

1. A pants-type absorbent article having a vertical direction, a horizontal direction and a front-rear direction intersecting each other,

the pants-type absorbent article includes:

an absorbent main body; and

a waist member configured to be laminated on a non-skin side of the absorbent main body,

a pair of separating portions for separating the waistline member into a front body panel and a back body panel,

at least a pair of locking parts provided on both side parts in the right and left direction of either the front body or the rear body,

each of the pair of locking portions is a portion removably locked to a predetermined area of the other of the front body panel and the rear body panel, and

the other of the front body and the rear body includes a stretchable region at a vertically central position of the locking portion,

the stretchable region is a region stretchable in the left-right direction.

2. A pant-type absorbent article according to claim 1,

the absorbent main body includes an absorber elastic member that stretches and contracts in the longitudinal direction of the absorbent main body.

3. A pant-type absorbent article according to claim 2,

a plurality of the absorber elastic members are provided at predetermined intervals in the left-right direction, and

the stretchable region has a width in the left-right direction larger than a distance in the left-right direction between the absorber elastic member disposed outermost on one side in the left-right direction and the absorber elastic member disposed outermost on the other side in the left-right direction.

4. A pant-type absorbent article according to claim 2 or 3,

the absorbent body includes an absorbent core containing a superabsorbent polymer, and

the width in the left-right direction of the stretchable region is larger than the width in the left-right direction of the absorbent core.

5. A pant-type absorbent article according to any one of claims 2-4,

the width in the left-right direction of the stretchable region is larger than the width in the left-right direction of the absorbent main body.

6. A pant-type absorbent article according to any one of claims 2 to 5,

the front upper end of the absorber elastic member is located below the lower end of the expansion/contraction region in the up-down direction.

7. A pant-type absorbent article according to any one of claims 2 to 6,

the front upper end of the absorber elastic member is located below the lower end of the separating portion in the up-down direction.

8. A pant-type absorbent article according to any one of claims 2 to 7,

the pants-type absorbent article further comprises a pair of side joined portions in both end portions in the left-right direction,

each of the pair of side joining portions is a portion that joins the front body panel and the rear body panel to each other, and

in a state where the locking part is locked to the lumbar member,

the locking portion is located on an outer side in the left-right direction of the absorber elastic member and an inner side in the left-right direction of the side joining portion.

9. A pant-type absorbent article according to any one of claims 1 to 8,

the following parts are provided: in this portion, both end portions in the left-right direction of the absorbent main body and the stretchable region overlap each other with respect to the up-down direction.

10. A pant-type absorbent article according to any one of claims 1 to 9,

in the unfolded and extended state of the mattress,

a contraction force in the left-right direction of the stretchable region in a portion of the stretchable region overlapping the absorbent main body when viewed in a thickness direction

Is less than

A contraction force in the left-right direction of the stretchable region in a portion of the stretchable region that does not overlap with the absorbent main body when viewed in the thickness direction.

11. A pant-type absorbent article according to any one of claims 1 to 10,

a low expansion region having an expansion and contraction property lower than that of the expansion and contraction region is provided, and

the low expansion/contraction region is disposed outside the expansion/contraction region in the left-right direction.

12. A pant-type absorbent article according to claim 11,

at least a part of the low expansion/contraction region is disposed outside the expansion/contraction region in the left-right direction, and is disposed at a position overlapping the expansion/contraction region with respect to the up-down direction.

13. A pant-type absorbent article according to claim 11 or 12,

the width in the left-right direction of the expansion region is larger than the width in the left-right direction of the low expansion region.

14. A pant-type absorbent article according to any one of claims 1 to 13,

the entire locking portion overlaps with the telescopic region with respect to the up-down direction.

15. A pant-type absorbent article according to any one of claims 1-14,

the absorbent body includes an absorbent core containing a superabsorbent polymer, and

in the up-down direction, a lower end of the locking portion is located above an upper end of the absorbent core.

16. A pant-type absorbent article according to any one of claims 1 to 15,

the pant-type absorbent article further comprises a tab having the locking portion,

a tab engagement portion is provided on an outer side in the left-right direction of the lock portion,

the tab engaging portion is a portion that engages the tab to the waist member, and

the locking portion is provided with any one of a hook member and a loop member in a hook and loop fastener.

17. A pant-type absorbent article according to claim 16,

the pant-type absorbent article further comprises a pair of side joining portions in both end portions in the left-right direction,

each of the pair of side joint portions is a portion joining the front body panel and the rear body panel to each other,

the tab engaging portions are provided at any position from the outer end of the absorbent main body to the side engaging portions in the left-right direction, and

the separating portion is disposed between the tab engaging portion and the locking portion in the left-right direction.

18. A pant-type absorbent article according to any one of claims 1 to 17,

the rear body includes leg elastic members that are stretchable in the left-right direction along a lower end edge portion of the rear body.

19. A pant-type absorbent article according to any one of claims 1 to 18,

the absorbent main body includes an absorber elastic member that stretches and contracts in the longitudinal direction of the absorbent main body, and

the stress in the left-right direction of the stretchable region is greater than the stress in the up-down direction of the region in which the absorber elastic member is disposed.

20. A pant-type absorbent article according to any one of claims 1 to 19,

the other of the front body piece and the rear body piece includes the telescopic region in an entire portion between upper and lower ends in the up-down direction of the locking portions and between inner side ends in the left-right direction of a pair of the locking portions.

21. A pant-type absorbent article according to any one of claims 1-20,

the absorbent main body includes an absorber elastic member that stretches and contracts in the longitudinal direction of the absorbent main body, and

the length of a portion of the absorber elastic member located on the rear side with respect to the central position is longer than the length of a portion of the absorber elastic member located on the front side with respect to the central position in the longitudinal direction.

22. A pant-type absorbent article according to claim 21,

the back piece includes a tab in which the locking portion is provided, and

a rear-side upper end of the absorber elastic member is located above a lower end of the protruding piece in the up-down direction.

23. A pant-type absorbent article according to any one of claims 1 to 22,

the pant-type absorbent article further comprises:

a front leg elastic member extending along an end edge portion located on a lower side of the front body in the vertical direction; and

a rear leg elastic member extending along an end edge portion located on a lower side in the vertical direction of the rear body, and

the length of the front leg elastic member in the left-right direction is shorter than the length of the rear leg elastic member in the left-right direction.

24. A pant-type absorbent article according to claim 23,

an upper end of the front leg elastic member is located below a lower end of the locking portion in the up-down direction.

25. A pant-type absorbent article according to any one of claims 1 to 24,

disposing a functional material in a predetermined region of at least any one of the absorbent main body and the waistline member,

the functional material contains at least any one of a cold-feeling agent, a warm-feeling agent, and a fragrance.

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