JP7271249B2 - Pants-type absorbent article - Google Patents

Description

The present invention relates to pants-type absorbent articles.

As a stretchable structure for the waist portion of an absorbent article, there is an absorbent article having an elongated elastic stretchable member provided along the stretching direction between two sheet layers. For example, in Patent Document 1, both ends of an elastic stretchable member are fixed to two sheet layers, and between the fixed ends, the elastic stretchable member becomes a free portion that is not fixed to the two sheet layers. A telescoping structure is disclosed.

Japanese Patent No. 6254625

In a general underpants-type absorbent article, both side portions in the left-right direction of each of a pair of waist portions provided with stretchable members are locked by a pair of locking portions. As in Patent Document 1, both ends of an elastic stretchable member included in a waist portion are fixed to two sheet layers, and between the fixed ends, a free portion in which the elastic stretchable member is not fixed to the two sheet layers is provided. This will improve the flexibility of the waist area. However, since the flexibility of the waist portion is improved, the waist portion tends to become bulky, and it becomes difficult to maintain the shape of the waist portion only with the locking portions. As a result, the wearer's waist cannot be tightly covered with the waist part of the absorbent article, which leads to leakage of excrement and deterioration of wearing comfort.

The present invention has been made in view of the above problems, and an object of the present invention is to maintain the shape of the waist portion while improving the flexibility of the waist portion of a pants-type absorbent article.

The main invention for achieving the above object is
having a horizontal direction and a vertical direction,
A pants-type absorbent article having a pair of waist portions and an absorbent main body, wherein both side portions of the pair of waist portions in the left-right direction are locked by a pair of locking portions. ,
At least one of the pair of waist portions has a pair of sheets and a plurality of stretchable members arranged between the pair of sheets and stretchable in the left-right direction,
At least one of the plurality of elastic members,
arranged continuously from one end portion to the other end portion in the left-right direction of the one waist portion, and
a pair of fixed end portions fixed to the pair of sheets at both ends in the left-right direction; has
In the one waist portion, a reinforcing means is arranged in a region outside the locking portion in the left-right direction to reinforce the region, and at least part of the region where the non-fixed portion is located. is not provided with the reinforcing means,
The pants-type absorbent article is characterized in that the reinforcing means is the stretchable member and an adhesive that fixes the stretchable member to the pair of sheets .
Other features of the present invention will become apparent from the description of the specification and accompanying drawings.

ADVANTAGE OF THE INVENTION According to this invention, the shape of a waist part can be maintained, improving the flexibility of the waist part of a pants|underpants type absorbent article.

1 is a schematic perspective view of an underpants-type disposable diaper 1. FIG. 1 is a schematic plan view of a diaper 1 in an unfolded and stretched state; FIG. 3 is a schematic cross-sectional view taken along line II of FIG. 2; FIG. Fig. 3 is a schematic plan view of the ventral waist portion 20 of the first embodiment; 5 is an enlarged view of an end portion of the ventral waist portion 20 shown in FIG. 4. FIG. FIG. 4 is a schematic cross-sectional view of a region outside a locking portion 40 in the first embodiment; It is a schematic plan view of the ventral waist part 20 of a modification. 8A and 8B are explanatory diagrams of the locking portion 40. FIG. FIG. 11 is a schematic plan view of an end portion of a ventral waist portion 20 of the second embodiment; It is a schematic sectional view of the area|region outside the latching|locking part 40 in 2nd Embodiment. FIG. 11 is a schematic plan view of a waist portion 20 of a third embodiment; FIG. 11 is a schematic plan view of a waist portion 20 of a third embodiment; FIG. 2 is a schematic perspective view showing an example of sheets 21 and 22 having a plurality of apertures 25;

At least the following matters will become apparent from the descriptions of this specification and the accompanying drawings.
It has a horizontal direction and a vertical direction, and has a pair of waist portions and an absorbent main body, and both side portions of the pair of waist portions in the left and right direction are locked by a pair of locking portions. At least one of the pair of waist portions includes a pair of sheets and a plurality of stretchable members arranged between the pair of sheets and stretchable in the left-right direction. at least one of the plurality of elastic members is arranged continuously from one end in the left-right direction to the other end of the one waist portion, and both ends in the left-right direction has a pair of fixed end portions fixed to the pair of sheets, and a non-fixed portion not fixed to the pair of sheets inside the fixed end portions in the left-right direction; In the waist portion of the above, a reinforcing means is arranged in a region outside the locking portion in the left-right direction to reinforce the region, and at least a part of the region where the non-fixed portion is located, A pants-type absorbent article, wherein the reinforcing means is not arranged.

According to such a pants-type absorbent article, the non-fixed portion of the elastic member can improve the flexibility of the waist portion. In addition, the region outside the engaging portion in the left-right direction is reinforced and functions as a column extending in the vertical direction, making it easier to maintain the shape of the waist portion.

The underpants-type absorbent article is characterized in that the end fixing portions are arranged inside the locking portions in the left-right direction.

According to such a pants-type absorbent article, by arranging the end fixing portions separately from the engaging portions, the end portions of the waist portion in the left-right direction are reinforced, and the shape of the waist portion is maintained. easier to be

Such a pants-type absorbent article, wherein the reinforcing means is a separate sheet.

According to such a pants-type absorbent article, it is possible to reinforce the region outside the engaging portion in the left-right direction.

Such a pants-type absorbent article, wherein the another sheet is a film.

According to such a pants-type absorbent article, the highly rigid film can further reinforce the region outside the engaging portion in the left-right direction.

In such a pants-type absorbent article, the another sheet is fixed to the pair of sheets with an adhesive between the pair of sheets outside the engaging portion in the left-right direction. A pants-type absorbent article characterized by:

According to such a pants-type absorbent article, the adhesive in addition to the separate sheet can further reinforce the region outside the engaging portion in the left-right direction.

The pants-type absorbent article is characterized in that the inner edge of the another sheet is located inside the inner edge of the locking portion in the left-right direction.

According to such a pants-type absorbent article, another sheet is arranged across the locking portion, and the other sheet is firmly fixed by the locking portion.

In such a pants-type absorbent article, the inner edge of the separate sheet is located outside the inner edge of the end fixing portion in the left-right direction. .

According to such a pants-type absorbent article, it is possible to prevent the rigidity of the region where the end fixing portion is located from being excessively increased by another sheet, and improve the flexibility of the waist portion.

Such a pants-type absorbent article, wherein the reinforcing means is the stretchable member and an adhesive that fixes the stretchable member to the pair of sheets.

According to such a pants-type absorbent article, it is possible to fix the elastic member in a contracted state existing in the region outside the engaging portion in the left-right direction with an adhesive. Therefore, the stiffness of the stretchable member in the contracted state and the stiffness of the adhesive further increase the stiffness of the outer region, so that the region outside the locking portion can be reinforced.

In this pants-type absorbent article, the elastic member as the reinforcing means is the elastic member having the pair of fixed end portions and the non-fixed portion, and the fixed end portions The elastic member is fixed to the pair of sheets with an adhesive at the end fixing portion, and the adhesive at the end fixing portion and the reinforcement A pants-type absorbent article, wherein the adhesive as means is continuous in the left-right direction.

According to such a pants-type absorbent article, the process of applying an adhesive during manufacturing can be facilitated.

The pants-type absorbent article is characterized in that the inner ends of the reinforcing means are located outside the outer ends of the absorbent main body in the left-right direction.

According to such a pants-type absorbent article, it is possible to prevent the length of the reinforcing means from becoming too long in the left-right direction, and improve the flexibility of the waist portion.

In such a pants-type absorbent article, the reinforcing means is arranged at least from the outer end of the engaging portion to the end of the one waist portion in the left-right direction. A pants-type absorbent article.

According to such a pants-type absorbent article, a wide range of the region outside the engaging portion in the left-right direction is reinforced, and the shape of the waist portion can be easily maintained.

In this pants-type absorbent article, the one waist portion is a first sheet joint portion where the pair of sheets are joined inside the end fixing portion in the width direction, The absorbency is characterized in that it does not have a first sheet joint portion arranged without intersecting with a portion for fixing the elastic member to the pair of sheets inside the end fixing portion in the width direction. Goods.

According to such a pants-type absorbent article, since the first sheet joint portion is not arranged, the flexibility of the waist portion can be improved.

In the pants-type absorbent article, the one waist portion includes a second sheet in which the pair of sheets are joined together in a region inside the outer ends of the engaging portions in the left-right direction. A pants-type absorbent article, wherein a joint portion is arranged, and the second sheet joint portion is not arranged in a region outside an outer end of the locking portion in the left-right direction.

According to such a pants-type absorbent article, the second sheet joining portion can prevent the pair of sheets from floating, thereby improving the appearance of the pants-type absorbent article. In addition, it is possible to suppress excessive reinforcement by the second sheet joint portion of the region outside the locking portion in the left-right direction, and improve the flexibility of the waist portion.

The underpants-type absorbent article is characterized in that the second sheet joining portion is spaced inward in the left-right direction from the engaging portion.

According to such a pants-type absorbent article, it is possible to prevent the locking portion from becoming excessively rigid, and to improve the flexibility of the waist portion.

In such a pants-type absorbent article, the outer edge of the second sheet joint portion is located inside the inner edge of the end fixing portion in the left-right direction. sexual goods.

According to such a pants-type absorbent article, it is possible to prevent excessive rigidity in the region where the end fixing portions are located, and to improve the flexibility of the waist portion.

The underpants-type absorbent article as described above, wherein the engaging portion has a plurality of semicircular welded portions divided in the left-right direction and arranged in the up-down direction.

According to such a pants-type absorbent article, the rigidity in the up-down direction of the engaging portion can be increased, and the shape of the waist portion can be easily maintained. In addition, it is possible to prevent the locking portion from becoming too long in the left-right direction, thereby improving the flexibility of the waist portion.

In this underpants-type absorbent article, at least one of the pair of sheets is provided with a plurality of spaced openings penetrating from the front and back, and the unfixed portion is provided in the waist portion. A pants-type absorbent article characterized by having a portion where a region where the opening is formed and a region where the opening is provided overlap.

According to such a pants-type absorbent article, since the openings are provided in the region overlapping the highly flexible non-fixed portion in the waist portion, the influence of hardening of the outer peripheral edge portion of the openings is reduced. It becomes relatively small, and it is possible to prevent the waist from becoming hard to the touch. In addition, since the non-fixed portion is not provided with adhesive, it is difficult for the wearer to feel the stickiness of the adhesive through the openings. Therefore, the flexibility and breathability of the waist portion can be improved without causing discomfort to the wearer.

===Embodiment===
Hereinafter, as an underpants-type absorbent article according to the present invention, an embodiment will be described by taking an underpants-type disposable diaper for infants as an example. However, the pants-type absorbent article according to the present invention is not limited to the above, and can be applied to adult pants-type disposable diapers, sanitary shorts, and the like.

===Structure of Pants-type Disposable Diaper 1===
FIG. 1 is a schematic perspective view of an underpants-type disposable diaper 1 (hereinafter "diaper"). FIG. 2 is a schematic plan view of the diaper 1 in an unfolded and stretched state. FIG. 3 is a schematic cross-sectional view along line II in FIG. The "deployed state" of the pants-type diaper is a state in which the pair of waist portions 20 and 30 are separated by releasing the joining of locking portions 40, which will be described later, and the diaper 1 is opened in the longitudinal direction.

The diaper 1, in the pants-type state shown in FIG. 1, has horizontal, vertical, and front-back directions, and is formed with a waist opening BH and a pair of leg openings LH. In the vertical direction, the waist side is the upper side and the crotch side is the lower side. In the front-rear direction, the wearer's ventral side is the front side, and the wearer's dorsal side is the rear side. Further, as shown in FIG. 3, the direction in which the materials constituting the diaper 1 are laminated is called the thickness direction. Use the skin side.

The diaper 1 also has a pair of waist portions 20 and 30 and an absorbent body 10 . Of the pair of waist sections 20 and 30, the one that is applied to the abdomen of the wearer is referred to as the abdomen side waist section 20, and the one that is applied to the back side of the wearer is referred to as the back side waist section 30.例文帳に追加

In the unfolded state shown in FIG. 2 , the diaper 1 has one end in the longitudinal direction of the absorbent body 10 arranged in the center of the ventral waist portion 20 in the left-right direction, and the back waist in the left-right direction. The end portion of the absorbent main body 10 on the other longitudinal direction is arranged in the center portion of the surrounding portion 30 . In the diaper 1 in the unfolded state, the absorbent main body 10 is folded in half at substantially the center in the longitudinal direction, and both side portions in the lateral direction of the ventral waist portion 20 and the back waist portion 30 form a pair of locking portions 40 . 1, the diaper 1 in the underpants-type state shown in FIG. 1 is obtained. As a locking method for the locking portion 40, welding, bonding with an adhesive, or the like can be exemplified.

The absorbent main body 10, as shown in FIG. It has a liquid-impermeable back sheet 13 and an exterior sheet 14 arranged on the non-skin side of the back sheet 13. - 特許庁

As shown in FIG. 2, the absorbent body 11 has an absorbent core 11A that absorbs and retains excretions such as urine, and a liquid-permeable core wrap sheet 11B that covers the absorbent core 11A. As the absorbent core 11A, liquid absorbent fibers such as pulp containing superabsorbent polymer (SAP) molded into a predetermined shape can be exemplified. Note that the absorbent core 11A may not be covered with the core wrap sheet 11B.

Further, as shown in FIG. 2, leg-surrounding elastic members 15 are provided on both sides of the absorbent body 10 in the left-right direction, so that the diaper 1 fits around the wearer's legs.

As shown in FIG. 3, the ventral waist portion 20 and the back waist portion 30 are composed of soft skin-side sheets 21, 31 and non-skin-side sheets 22, 32 (a pair of sheets) such as nonwoven fabric, respectively, and It has a plurality of waist stretching members 23, 33 arranged between the skin-side sheets 21, 31 and the non-skin-side sheets 22, 32 and stretchable in the lateral direction. Between the skin-side sheets 21, 31 and the non-skin-side sheets 22, 32, the plurality of waist elastic members 23, 33 are arranged side by side with a gap in the vertical direction, and are stretched in the horizontal direction. Fixed. Therefore, the ventral waist portion 20 and the back waist portion 30 expand and contract in the lateral direction to fit the waist of the wearer. As the waist stretchable members 23 and 33, thread-like stretchable members such as thread rubber and elongated stretchable sheets can be exemplified. Also, the construction of the waist sections 20, 30 is not limited to the one shown in the drawings, and for example, it may be constructed of three or more layers in which different sheets are laminated on a pair of sheets, or one sheet may be folded. A pair of sheets may also be used.

In addition, in this embodiment, as a pants-type disposable diaper, the abdominal waist portion 20 and the back waist portion 30 are separated, and the abdominal waist portion 20, the back waist portion 30, and the absorbent main body 10 are divided into three parts. Although a so-called three-piece type having members has been exemplified, it is not limited to this. For example, the ventral waist part 20 and the back waist part 30 are formed as one continuous member through the crotch part, and the exterior in which the ventral waist part 20 and the back waist part 30 are integrated. It may be a so-called two-piece underpants type disposable diaper having two members, a member and an absorbent body.

===Regarding the waist portions 20 and 30===
(First embodiment)
FIG. 4 is a schematic plan view of the ventral waist portion 20 of the first embodiment. FIG. 5 is an enlarged view of the end portion of the ventral waist portion 20 shown in FIG. FIG. 6 is a schematic cross-sectional view of a region outside the engaging portion 40 in the first embodiment. FIG. 7 is a schematic plan view of the ventral waist portion 20 of the modified example. 8A and 8B are explanatory diagrams of the locking portion 40. FIG.

Hereinafter, the configuration of the pair of waist portions 20 and 30 will be described by taking the ventral waist portion 20 as an example. However, at least one of the pair of waist portions 20 and 30 may have the following configuration. That is, both waist sections 20 and 30 may have the following configuration, or the abdominal side waist section 20 may have the following configuration different from the following configuration, and the back side waist section 30 may have the following configuration. The side waist portion 20 may have the following configuration, and the back side waist portion 30 may have a different configuration from the following. Other embodiments are also the same.

A plurality of waist-surrounding stretchable members 23 (stretchable members of the present invention) of the ventral waist-surrounding portion 20 (hereinafter “trunk-surrounding portion 20”) are continuous from one end to the other in the left-right direction of the waist-surrounding portion 20. It has a plurality of “continuous stretchable members 231” arranged in parallel and a plurality of “non-continuous stretchable members 232” arranged discontinuously in the left-right direction.

The discontinuous stretchable member 232 is arranged below the continuous stretchable member 231, and is discontinuous (non-stretchable) in at least part of the region overlapping the absorbent core 11A in the left-right direction. By doing so, contraction of the absorbent core 11A by the waist elastic member 23 can be suppressed. However, the waist part 20 does not have to have the discontinuous stretchable member 232 .

The continuous stretchable member 231 has a “pair of end fixing portions 50 ” fixed to the skin-side sheet 21 and the non-skin-side sheet 22 at both ends in the left-right direction. The fixing method in the end fixing part 50 is not particularly limited. , 22”), or a method of fixing with a pair of welded portions crossing the continuous stretchable member 231, or the like.

Further, the continuous stretchable member 231 has a “non-fixed portion 51 ” that is not fixed to the pair of sheets 21 and 22 inside the fixed end portion 50 in the left-right direction. The portion where the waist elastic member 23 is fixed to the pair of sheets 21 and 22 has higher rigidity due to the curing of the adhesive or the like than the portion where it is not fixed. Therefore, since the continuous elastic member 231 has the non-fixed part 51, the area of the part with high rigidity can be reduced compared to the case where the waist elastic member 23 is fixed to the pair of sheets 21 and 22 over almost the entire area. can be made smaller. Therefore, the flexibility of the waist part 20 can be improved, and the wearing comfort of the waist part 20 can be improved.

In particular, in the first embodiment (FIG. 4), the non-fixed portion 51 is continuous from the fixed end portion 50 on one side in the horizontal direction to the fixed end portion 50 on the other side, and is arranged long in the horizontal direction. . Therefore, flexibility of the waist portion 20 is further improved.

However, since the flexibility of the waist portion 20 is improved, the rigidity of the waist portion 20 is decreased, and the waist portion 20 is easily deformed such as being folded or crushed. In the case of the underpants-type diaper 1, locking portions 40 extending in the vertical direction are arranged at both ends of the waist portion 20 in the left-right direction. shape) is difficult to maintain. As a result, the wearer's waist cannot be tightly covered with the waist part 20, which leads to leakage of excrement and deterioration of wearing comfort.

Therefore, a reinforcement means 60 for reinforcing the area outside the engaging portion 40 in the left-right direction of the waist portion 20 is arranged to increase the rigidity in the vertical direction of the area outside the engaging portion 40. . By doing so, the engaging portion 40 and the region outside the engaging portion 40 function as a column extending in the vertical direction, and the waist portion 20 can be prevented from being sagging or crushing. By maintaining the shape of the waist portion 20 in this manner, the wearer's waist can be securely covered with the waist portion 20 . Note that the region outside the locking portion 40 is a region outside the outer end 40a of the locking portion 40 in the left-right direction.

On the other hand, it is assumed that the reinforcing means 60 is not arranged in at least part of the region where the non-fixed portion 51 of the continuous elastic member 231 is located. Therefore, at least a part of the region where the non-fixed portion 51 is located is reinforced and the rigidity is not increased, and the flexibility of the waist portion 20 is maintained. The non-fixing portion 51 and the reinforcing means 60 do not overlap in the thickness direction (the front-rear direction of the diaper 1).

In the first embodiment, the reinforcement means 60 is another sheet 61 different from the pair of sheets 21 and 22 . By arranging another sheet 61 in the region outside the latching portion 40 in the left-right direction, the number of sheets stacked in the region outside the region increases, and the region outside the region is reinforced. Another sheet 61 may be arranged between the pair of sheets 21 and 22 as shown in FIG. 6, or may be arranged outside the pair of sheets 21 and 22 in the thickness direction.

Further, another sheet 61, which is the reinforcing means 60, is preferably a "film". A film is, for example, a plastic film such as polyethylene, polypropylene, or polyester. When a film having a higher rigidity than the flexible sheets such as non-woven fabric constituting the pair of sheets 21 and 22 is used as the reinforcing means 60, the reinforcing effect of the region outside the engaging portion 40 in the left-right direction is is increased, and the shape of the waist portion 20 can be easily maintained. However, the sheet 61 is not limited to the above, and may be a sheet (nonwoven fabric, etc.) other than the film.

Further, as shown in FIG. 5, another sheet 61 (reinforcing means 60) is arranged at least from the outer end 40a of the engaging portion 40 to the end 20a of the waist portion 20 in the lateral direction. preferable. Further, in this embodiment, the vertical length of the separate sheet 61 is equal to the vertical length of the engaging portion 40 . In other words, another sheet 61 is arranged over the entire region that is outside the engaging portion 40 in the left-right direction and overlaps with the engaging portion 40 in the vertical direction. By arranging the separate sheet 61 over a wide area outside the engaging portion 40 in this manner, the rigidity of the wide area is increased, and the shape of the waist portion 20 is easily maintained. However, it is not limited to the above, and another sheet 61 may be arranged in a part in the left-right direction or a part in the up-down direction in the region outside the locking portion 40 .

Further, as shown in FIG. 6, another sheet 61 is fixed to the pair of sheets 21 and 22 with an adhesive 62 between the pair of sheets 21 and 22 outside the engaging portion 40 in the left-right direction. preferably. By doing so, in addition to another sheet 61 , the adhesive 62 increases the rigidity of the region outside the engaging portion 40 in the left-right direction. That is, the adhesive 62 also functions as the reinforcing means 60 . It should be noted that a portion of the waist elastic member 23 remains in a contracted state in a region outside the engaging portion 40 in the left-right direction. A portion of the member 23 can be fixed between the pair of sheets 21,22. Therefore, the rigidity of the region can be further increased by the rigidity of the contracted waist elastic member 23 and the rigidity of the adhesive 62 . Therefore, the shape of the waist portion 20 is easily maintained. However, not limited to the above, another seat 61 may be fixed by the locking portion 40 .

In addition, as shown in FIG. 5, it is preferable that the inner end 61b of the other seat 61 is located inside the inner end 40b of the engaging portion 40 in the left-right direction. By arranging the separate sheet 61 across the engaging portion 40 in this manner, the separate sheet 61 can be firmly fixed to the pair of sheets 21 and 22 at the engaging portion 40 .

Further, in the case of the pants-type diaper 1, the user often removes the diaper 1 by breaking the engaging portion 40. As shown in FIG. Therefore, when the locking portion 40 is locked by welding, another sheet 61 should also be welded together with the pair of sheets 21 and 22 . By doing so, the sheet 61 stretches when the locking portion 40 is torn, so that the locking portion 40 breaks more slowly than when the sheet 61 is not welded. This makes it easier to prevent the locking portion 40 from being torn all at once or the portion of the waist portion 20 other than the locking portion 40 from being torn. Further, when the sheet 61 made of a material different from that of the pair of sheets 21 and 22 is welded, that is, when different components are welded together, the welding strength of the locking portion 40 is weakened. In this case, it becomes easier for the user to break the engaging portion 40 and the diaper 1 can be easily changed.

Moreover, as shown in FIG. 5, it is preferable that the inner edge 61b of the other sheet 61 is located outside the inner edge 50b of the end fixing portion 50 in the left-right direction. In other words, it is preferable that the other sheet 61 does not extend beyond the end fixing portion 50 to the absorbent main body 10 side. By doing so, the additional sheet 61 does not become unnecessarily long in the left-right direction, and the flexibility of the waist portion 20 is improved. Also, in this case, the non-fixed portion 51 of the continuous stretchable member 231 does not overlap another sheet 61 . In other words, another sheet 61 is not arranged in the entire region where the non-fixed portion 51 is located. Since the reinforcement means 60 is not arranged in the entire region where the non-fixed part 51 is located, the effect of improving the flexibility of the waist part 20 by the non-fixed part 51 is reduced by the reinforcement means 60. You can prevent it from slipping.

However, it is not limited to the above, and another sheet 61 may be arranged in part of the region where the non-fixed portion 51 is located. For example, the inner edge 61b of another sheet 61 may be located inside the inner edge 50b of the end fixing portion 50 in the left-right direction. Also in this case, it is preferable that the inner edge 61b of the separate sheet 61 is located outside the outer edge 10a of the absorbent body 10 in the left-right direction. Thus, the flexibility of the waist portion 20 is improved by not lengthening the other sheet 61 unnecessarily in the left-right direction.

Moreover, when the reinforcement means 60 is a separate sheet 61, it is preferable that the separate sheet 61 and the pair of sheets 21 and 22 have different colors. For example, for the pair of white sheets 21 and 22, another sheet 61 may be colored such as blue or pink. By doing so, another colored sheet 61 can be visually recognized from the outside (non-skin side) of the diaper 1 directly or through the pair of sheets 21 and 22 . Therefore, the other seat 61 is more likely to be noticed by the user, and the position of the engaging portion 40 is more likely to be recognized. Therefore, the user can quickly find and break the engaging portion 40 and easily change the diaper 1 . Also, the color of the sheet 61 may be changed between the ventral side and the dorsal side. For example, by making the abdomen side blue and the dorsal side red, the visibility of the front and back of the diaper 1 is improved, and it is possible to prevent the diaper 1 from being worn upside down. Further, a separate sheet 61 may be provided with designs, patterns, character information, and the like. For example, the sheet 61 may be given a border pattern or a brand name to improve its design, or the user's convenience may be further improved by displaying information indicating the breaking start position when breaking the lock 40 . be able to.

Also, the pair of end fixing portions for fixing both ends of the continuous stretchable member 231 to the pair of sheets 21 and 22 may be the pair of locking portions 40 . However, as shown in FIG. 4 , it is preferable to dispose the end fixing portion 50 inside the locking portion 40 in the left-right direction separately from the locking portion 40 . By doing so, both ends of the continuous elastic member 231 can be firmly fixed to the pair of sheets 21 and 22 by the end fixing portions 50 . Further, the region where the fixed end portion 50 is positioned has higher rigidity than the region where the non-fixed portion 51 is positioned. Therefore, the shape of the waist portion 20 can be easily maintained by the end fixing portions 50 as well. Note that it is sufficient that the end fixing portion 50 is arranged at least inside the locking portion 40 in the left-right direction, and the end fixing portion 50 may be arranged across the locking portion 40, or the end portion The fixing portion 50 may be arranged so as to be spaced inward in the left-right direction from the locking portion 40 .

However, as shown in FIG. 4, the left and right of the region between the end fixing portion 50 on one side in the left and right direction and the end fixing portion 50 on the other side (between the inner ends 50b of the pair of end fixing portions 50) The length W1 in the direction is preferably longer than the length W2 in the horizontal direction of the absorbent body 10 (W1>W2). Thus, the flexibility of the waist portion 20 is improved by relatively shortening the length of the end fixing portion 50 in the left-right direction. When comparing the lengths W1 and W2, it is assumed that the diaper 1 is stretched in the horizontal direction without wrinkles.

When the locking portion 40 is locked by welding, as shown in FIG. 8A, the locking portion 40 has a plurality of semicircular welded portions 41 divided in the horizontal direction and arranged in the vertical direction. is preferred. By arranging the welded portions 41 in the vertical direction, the rigidity of the locking portion 40 in the vertical direction is increased, and the locking portion 40 is less likely to be crushed in the vertical direction. Therefore, the engaging portion 40 functions as a column, and the shape of the waist portion 20 is easily maintained. On the other hand, the length of the locking portion 40 in the left-right direction is shortened by dividing the welded portion 41 in the left-right direction into semicircular shapes. Therefore, the welding area of the engaging portion 40 is reduced, the welding strength can be weakened, and the user can easily break the engaging portion 40 . In addition, the flexibility of the waist portion 20 is improved by suppressing the lateral length of the locking portion 40 from becoming unnecessarily long.

In addition, as shown in FIG. 8A , when the welded portion 41 has a semicircular shape projecting outward in the left-right direction, the area ratio of the welded portion 41 increases at the inner end portion in the left-right direction of the locking portion 40 . Welding strength increases. Therefore, the engaging portion 40 can resist the force applied from the waist of the wearer, and can prevent breakage of the engaging portion 40 during wearing. Conversely, the welded portion 41 may have a semicircular shape projecting inward in the left-right direction. In this case, the area ratio of the welded portion 41 is reduced at the inner end portion of the locking portion 40 in the left-right direction, and the welding strength is weakened. Therefore, when changing the diaper 1, the user can easily tear the engaging portion 40 from the inner side to the outer side in the left-right direction.

In addition, it is preferable that the locking portion 40 has one row in which a plurality of welded portions 41 are arranged in the vertical direction. By doing so, the rigidity of the locking portion 40 in the vertical direction is increased, and the shape of the waist portion 20 is easily maintained. Moreover, since the length of the engaging portion 40 in the left-right direction is shortened, the engaging portion 40 is easily broken, and the flexibility of the waist portion 20 is improved.

However, the pattern of the welded portion 41 is not limited to the above. For example, as shown in FIG. 8B, a plurality of elliptical welding portions 41 elongated in the left-right direction may be arranged in the up-down direction. In this case as well, the area ratio of the welded portion 41 is reduced at the inner end portion of the locking portion 40 in the left-right direction, and the welding strength is weakened, so that the locking portion 40 is easily broken. In addition, a plurality of rows of welded portions 41 arranged in the vertical direction may be arranged in the horizontal direction.

Further, in the waist portion 20 shown in FIG. 4, all the continuous elastic members 231 have the non-fixed portion 51, but this is not restrictive. At least one of the continuous elastic members 231 should have the non-fixed portion 51 . However, as the number of continuous elastic members 231 having non-fixed portions 51 increases, the flexibility of the waist portion 20 improves.

The non-continuous expansion/contraction member 232 also has fixed end portions 50 fixed to the pair of sheets 21 and 22 at both ends in the horizontal direction of the continuous portion, and non-fixed portions not fixed to the pair of sheets 21 and 22 . 51. Since the discontinuous stretchable member 232 also has the non-fixed portion 51 in this way, the flexibility of the waist portion 20 is improved. However, the discontinuous elastic member 232 may not have the non-fixed portion 51 .

In addition, as shown in FIG. 4, the non-fixed portion 51 of the continuous elastic member 231 is not necessarily arranged continuously from the fixed end portion 50 on one side in the left-right direction to the fixed end portion 50 on the other side. For example, as shown in the modified example of FIG. 7, the continuous elastic member 231 may have a central fixing portion 52 fixed to the pair of sheets 21 and 22 inside the end fixing portions 50 in the left-right direction. . The vertical movement of the continuous stretchable member 231 is restricted by the central fixed portion 52 . Therefore, the space between the continuous stretchable members 231 in the vertical direction can be easily maintained, and stretchability can be imparted over a wide range of the waist portion 20 .

Moreover, the central fixed part 52 is preferably arranged in a region overlapping the absorbent core 11A in the left-right direction. By doing so, the continuous stretchable member 231 is fixed to the skin-side sheet 21 in the region where the absorbent core 11A exists in the left-right direction. Therefore, the skin-side sheet 21 is also fixed at the position where the continuous stretchable member 231 is in close contact with the wearer, and the absorbent core 11A indirectly fixed to the skin-side sheet 21 is also less likely to be displaced in the vertical direction. As a result, the fit of the absorbent core 11A to the wearer is increased, excrement is less likely to leak, and the wearing comfort of the diaper 1 is improved. However, the arrangement pattern of the non-fixed portion 51 and the central fixed portion 52 shown in FIG. 7 is an example, and is not limited to this.

(Second embodiment)
FIG. 9 is a schematic plan view of the end portion of the ventral waist portion 20 of the second embodiment. FIG. 10 is a schematic cross-sectional view of a region outside the engaging portion 40 in the second embodiment.

In the second embodiment, as shown in FIGS. 9 and 10, the waist elastic member 23 and the adhesive 63 for fixing the waist elastic member 23 to the pair of sheets 21 and 22 are used as the reinforcing means 60. . Since the waist elastic member 23 is fixed with the adhesive 63 in the region outside the engaging portion 40 in the left-right direction, the waist elastic member 23 and the adhesive 63 are present in the outer region. and can reinforce the area outside it. The waist elastic member 23 as the reinforcing means 60 may be a continuous elastic member 231 or a discontinuous elastic member 232 .

Also, in the region where the unfixed portion 51 of the waist elastic member 23 is located, the waist elastic member 23 is not fixed with an adhesive, and the reinforcing means 60 is not arranged. Therefore, the flexibility of the waist portion 20 is maintained.

Further, as shown in FIG. 9, the reinforcing means 60 (the waist elastic member 23 fixed by the adhesive 63) extends from the outer end 40a of the engaging portion 40 to the end 20a of the waist portion 20 at least in the lateral direction. It is preferably arranged over the By doing so, a wide range in the left-right direction of the region outside the engaging portion 40 in the left-right direction is reinforced, the rigidity is increased, and the shape of the waist portion 20 is more easily maintained. However, the reinforcing means 60 may not reach the outer end 20a of the waist portion 20 without being limited to the above.

Moreover, at least one of the plurality of waist-surrounding elastic members 23 may be fixed with the adhesive 63 in a region outside the engaging portion 40 in the left-right direction. However, as shown in FIG. 9, the larger the number of waist elastic members 23 fixed with the adhesive 63 in the region outside the engaging portion 40 in the left-right direction, the wider the vertical range is reinforced. Rigidity increases. Therefore, the shape of the waist portion 20 is more likely to be maintained.

The waist elastic member 23, which is the reinforcing means 60, is a continuous elastic member 231 having a pair of fixed end portions 50 and a non-fixed portion 51. In the fixed end portion 50, the continuous elastic member 231 is a pair of sheets. 21 and 22 are fixed with an adhesive 63 . In that case, the adhesive 63 of the end fixing portion 50 and the adhesive 63 of the reinforcing means 60 are preferably continuous in the left-right direction.

By doing so, in the manufacturing process of the diaper 1, the step of applying the adhesive 63 for the end fixing portions 50 and the step of applying the adhesive 63 as the reinforcing means 60 can be performed continuously. Therefore, the step of applying the adhesive 63 can be facilitated.

Similarly, when the discontinuous stretchable member 232 as the reinforcing means 60 has a pair of the fixed end portion 50 and the non-fixed portion 51, the adhesive 63 of the fixed end portion 50 and the adhesive 63 as the reinforcing means 60 The agent 63 is preferably continuous in the left-right direction. By doing so, the process of applying the adhesive 63 can be facilitated.

Although not shown, the waist portion 20 may have a waist elastic member 23 that does not have the non-fixed portion 51 , and the waist elastic member 23 may be the reinforcing means 60 . In this case as well, the adhesive for fixing the waist elastic member 23 to the pair of sheets 21 and 22 on the inner side in the left-right direction than the engaging portion 40 and the adhesive as the reinforcing means 60 are continuously arranged in the left-right direction. It's good to be By doing so, the process of applying the adhesive can be facilitated.

9, the inner end 60b of the reinforcing means 60 (here, the inner end 50b of the end fixing portion 50) is located outside the outer end 10a of the absorbent body 10 in the left-right direction. preferably. By doing so, it is possible to prevent the reinforcing means 60 (end fixing portion 50) from becoming too long in the left-right direction, and the flexibility of the waist portion 20 is improved.

Also, in FIG. 9 , the end fixing portions 50 and the adhesive 63 as the reinforcing means 60 are arranged at intervals in the vertical direction for each waist-surrounding elastic member 23 . By doing so, it is possible to prevent the rigidity of the lateral ends of the waist portion 20 from being excessively increased, and the flexibility of the waist portion 20 is improved. However, not limited to the above, the end fixing portion 50 and the adhesive 63 as the reinforcing means 60 may be continuous in the vertical direction (not shown).

Further, the waist portion 20 of the second embodiment and the above-described first embodiment has a sheet joining portion where the pair of sheets 21 and 22 are joined inside the end fixing portion 50 in the left-right direction. don't have The sheet joint portion (the first sheet joint portion of the present invention) is a portion (for example, shown in FIG. The central fixed part 52 shown in FIG. . In other words, the sheet joint portion is a portion that is arranged without intersecting with the waist elastic member 23, and is a portion that directly joins the facing surfaces of the pair of sheets 21 and 22 to each other. For example, it is a sheet joining portion 70 shown in a third embodiment (FIG. 11) to be described later.

At the sheet joint portion, the rigidity is increased compared to the portion where the pair of sheets 21 and 22 are not joined. Therefore, unlike the first and second embodiments, since the waist portion 20 does not have a sheet joint portion, the flexibility of the waist portion 20 is further improved.

(Third embodiment)
11 and 12 are schematic plan views of the waist portion 20 of the third embodiment. In the waist portion 20 of the third embodiment, sheet joint portions 70 and 71 (the present second sheet joint) is arranged. As a method for joining the pair of sheets 21 and 22 at the sheet joining portions 70 and 71, well-known joining using an adhesive or welding can be exemplified.

A case where the waist portion 20 ( FIG. 9 ) described in the second embodiment has sheet joint portions 70 and 71 will be described below. It may have parts 70 and 71 .

The pair of sheets 21 and 22 are separated from each other in the region where the non-fixed portion 51 of the waist elastic member 23 is located. Therefore, in the appearance of the diaper 1, the non-skin side sheet 22 is likely to float and be visually recognized, and when the waist elastic member 23 is contracted, large irregular vertical wrinkles are likely to be formed. Therefore, by providing the sheet joint portions 70 and 71 in the waist portion 20, the floating of the non-skin side sheet 22 can be suppressed, and the appearance of the diaper 1 can be improved.

The sheet joint portion 70 shown in FIG. 11 extends longer in the horizontal direction than in the vertical direction of the diaper 1 . In addition, the portion (for example, the end portion fixing portion 50 or the central fixing portion 52 shown in FIG. 7) for fixing the waist elastic member 23 to the pair of sheets 21 and 22 and the sheet joint portion 70 are discontinuous. spaced apart in the direction. In other words, the sheet joint portion 70 is arranged without crossing the waist elastic member 23 . By providing the sheet joint portion 70 elongated in the left-right direction in the waist portion 20 in this way, when the waist stretchable member 23 contracts, fine regular wrinkles are likely to be formed. Therefore, the appearance of the diaper 1 is improved, and the user can be given an impression that the fit of the waist portion 20 is good.

Further, the sheet joint portion 70 restricts the movement of the waist elastic member 23 in the vertical direction. Therefore, the space between the waist elastic members 23 in the vertical direction can be easily maintained, and the waist part 20 can be stretchable over a wide range.

However, when the waist portion 20 has the sheet joint portion 70 , the flexibility of the waist portion 20 is reduced compared to when the waist portion 20 does not have the sheet joint portion 70 . However, the sheet joint portion 70 is less likely to adhere to the wearer's skin than the waist elastic member 23 . Therefore, compared to the hardness of the adhesive or the like that fixes the waist elastic member 23 to the pair of sheets 21 and 22, it is difficult for the user to feel the hardness of the adhesive or the like at the sheet joint portion 70. It can suppress the deterioration of comfort.

Moreover, it is not limited to the sheet joining portion 70 shown in FIG. 11 . For example, the sheet joint portions 70 may be intermittently arranged in the left-right direction without extending continuously in the left-right direction. Also, in the case of the waist portion 20 having the discontinuous stretchable member 232 , the sheet joint portion 70 does not need to be arranged in the discontinuous portion of the discontinuous stretchable member 232 . Further, the sheet joint portion 70 may be arranged only in a portion between a plurality of waist elastic members 23 arranged in the vertical direction.

Further, as shown in FIG. 12 , the sheet joint portion 71 may be arranged to intersect the waist elastic member 23 in the vertical direction. Specifically, in FIG. 12, a pair of sheet joints 71 are arranged at the same horizontal positions as the horizontal ends of the absorbent core 11A and above the absorbent core 11A. The sheet joint portion 71 has a rectangular shape elongated in the vertical direction.

The vertical movement of the continuous elastic member 231 is regulated by the sheet joint 71 shown in FIG. Therefore, the interval between the continuous stretchable members 231 in the vertical direction can be easily maintained, and stretchability can be imparted over a wide range of the waist portion 20 .

In addition, both ends of the waist portion 20 in the left-right direction are reinforced by the reinforcing members 60, so that the waist portion 20 is less likely to become loose or crushed. In the case of FIG. 12, since the sheet joint portion 71 functions as a pillar extending in the vertical direction, the central portion in the horizontal direction of the waist portion 20 is also less likely to collapse or collapse. Therefore, the shape of the waist portion 20 is more likely to be maintained.

Further, as shown in FIGS. 11 and 12, it is preferable that the sheet joint portions 70 and 71 are not arranged in a region outside the outer end 40a of the engaging portion 40 in the left-right direction. By doing so, it is possible to prevent the rigidity of the region outside the locking portion 40 from being excessively increased, and to improve the flexibility of the waist portion.

Moreover, as shown in FIGS. 11 and 12 , it is preferable that the sheet joint portions 70 and 71 be spaced inward in the left-right direction from the engaging portion 40 . By doing so, it is possible to prevent the locking portion 40 from becoming too rigid, and to improve the flexibility of the waist portion 20 . Further, when the sheet joint portions 70 and 71 are joined with an adhesive and the locking portion 40 is locked by welding, the amount of adhesive applied to the locking portion 40 can be reduced, and the amount of adhesive applied to the locking portion 40 can be reduced. It is possible to suppress exudation.

Further, as shown in FIGS. 11 and 12, it is preferable that the outer ends 70a and 71a of the sheet joining portions 70 and 71 are positioned inside the inner end 50b of the end fixing portion 50 in the left-right direction. . By doing so, it is possible to prevent the region where the end fixing portion 50 is located from being excessively rigid in the left-right direction, and to improve the flexibility of the waist portion 20 .

However, not limited to the above, for example, the sheet joint portion 70 shown in FIG. It may overlap with 50.

===Other Embodiments===
Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. Further, the present invention can be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof.

In the above-described embodiment, the waist portion 20 (30) is composed of a pair of flexible sheets 21, 22 (31, 32) such as nonwoven fabric. 25 may be provided. FIG. 13 is a schematic perspective view showing an example of sheets 21 and 22 having a plurality of apertures 25. As shown in FIG. In the example of FIG. 13 , the skin-side sheet 21 is a perforated nonwoven fabric in which a plurality of perforations 25 penetrating from the front to the back are provided at intervals. The plurality of openings 25 may be provided in the non-skin-side sheet 22 or may be provided in both the skin-side sheet 21 and the non-skin-side sheet 22 .

By providing a plurality of openings 25 in at least one of the pair of sheets 21 and 22, the air permeability of the sheet is improved, and when the diaper 1 is worn, the waist portion 20 is less likely to get stuffy. On the other hand, such openings 25 are usually formed using a heated pin member (not shown) or the like. , the opening 25 may become hard. In this case, the flexibility of the waist portion 20 is lost, and the feel of the waist portion 20 deteriorates. Further, when the openings 25 are provided and the fixing adhesive is applied to the entire area of the waist elastic member 23, when the waist elastic member 23 contracts, the basis weight of the adhesive is relatively low. There is a risk that the stickiness of the adhesive will be felt from all the waist elastic members 23 through the openings 25 .

On the other hand, the waist portion 20 has an unfixed portion 51 in which the waist elastic member 23 is not fixed to the waist portion 20 in a region inside the pair of fixed end portions 50, 50 in the width direction. have. A region where the non-fixed portion 51 is provided and a region where the plurality of openings 25 are provided overlap each other. Since the waist part 20 has high flexibility in the region where the non-fixed part 51 is provided, the influence of hardening of the outer peripheral edge of the opening 25 can be relatively reduced in this region. . That is, the tactile sensation of the waist portion 20 as a whole is less likely to become hard. In addition, in the non-fixed portion 51 , since the waist elastic member 23 is not coated with adhesive, it is possible to prevent the wearer from feeling stickiness of the adhesive through the openings 25 . Therefore, the flexibility and breathability of the waist portion 20 can be improved without causing discomfort to the wearer.

1 pants-type disposable diaper (absorbent article),
10 absorbent body, 11 absorber,
11A absorbent core, 11B core wrap sheet,
12 top sheet, 13 back sheet, 14 exterior sheet,
20 ventral waist portion (trunk portion), 30 dorsal waist portion (trunk portion),
21, 31 skin side sheet (sheet),
22, 32 non-skin side sheet (sheet),
23, 33 waist elastic member (elastic member),
231 continuous elastic member, 232 non-continuous elastic member,
25 apertures,
40 locking portion, 41, 42 welding portion,
50 fixed end portion, 51 non-fixed portion,
52 central fixed part,
60 reinforcing means, 61 another sheet, film, 62, 63 adhesive,
70 sheet joints (first sheet joints, second sheet joints),
71 sheet joint (second sheet joint),

Claims (11)

having a horizontal direction and a vertical direction,
A pants-type absorbent article having a pair of waist portions and an absorbent main body, wherein both side portions of the pair of waist portions in the left-right direction are locked by a pair of locking portions. ,
At least one of the pair of waist portions has a pair of sheets and a plurality of stretchable members arranged between the pair of sheets and stretchable in the left-right direction,
At least one of the plurality of elastic members,
arranged continuously from one end portion to the other end portion in the left-right direction of the one waist portion, and
a pair of fixed end portions fixed to the pair of sheets at both ends in the left-right direction; has
In the one waist portion, a reinforcing means is arranged in a region outside the locking portion in the left-right direction to reinforce the region, and at least part of the region where the non-fixed portion is located. is not provided with the reinforcing means,
A pants-type absorbent article, wherein the reinforcing means is the stretchable member and an adhesive that fixes the stretchable member to the pair of sheets . The pants-type absorbent article according to claim 1,
The underpants-type absorbent article, wherein the end fixing portion is arranged inside the locking portion in the left-right direction. The pants-type absorbent article according to claim 1 or 2 ,
The elastic member, which is the reinforcing means, is the elastic member having the pair of fixed end portions and the non-fixed portion,
The end fixing portion is arranged inside the locking portion in the left-right direction,
The elastic member is fixed to the pair of sheets with an adhesive at the end fixing part,
The underpants-type absorbent article, wherein the adhesive of the end fixing portion and the adhesive of the reinforcing means are continuous in the left-right direction. The pants-type absorbent article according to any one of claims 1 to 3 ,
The underpants-type absorbent article, wherein the inner ends of the reinforcing means are located outside the outer ends of the absorbent main body in the left-right direction. The pants-type absorbent article according to any one of claims 1 to 4 ,
The underpants-type absorbent article, wherein the reinforcing means is arranged at least from the outer end of the engaging portion to the end of the one waist portion in the left-right direction. The pants-type absorbent article according to any one of claims 1 to 5 ,
The one waist portion is a first sheet joining portion where the pair of sheets are joined inside the end fixing portion in the left-right direction , and is more than the end fixing portion in the left-right direction. An underpants-type absorbent article, characterized in that it does not have a first sheet joining portion arranged so as not to intersect with a portion for fixing the elastic member to the pair of sheets on the inner side thereof. The pants-type absorbent article according to any one of claims 1 to 6 ,
In one of the waist portions, a second sheet joint portion where the pair of sheets are joined is arranged in a region inside an outer end of the locking portion in the left-right direction. The underpants-type absorbent article, wherein the second sheet joint portion is not arranged in a region outside the outer ends of the engaging portions in the direction of the pull-on. The pants-type absorbent article according to claim 7 ,
The underpants-type absorbent article, wherein the second sheet joining portion is spaced inward in the left-right direction from the engaging portion. The pants-type absorbent article according to claim 8 ,
The underpants-type absorbent article, wherein the outer ends of the second sheet joining portions are located inside the inner ends of the end fixing portions in the left-right direction. The pants-type absorbent article according to any one of claims 1 to 9 ,
The underpants-type absorbent article, wherein the engaging portion has a plurality of semicircular welded portions divided in the left-right direction and arranged in the up-down direction. The pants-type absorbent article according to any one of claims 1 to 10 ,
At least one of the pair of sheets is provided with a plurality of spaced apart openings penetrating from the front and back,
A pants-type absorbent article, wherein the waist portion includes a region where the non-fixed portion is provided and the region where the opening is provided.

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