JP2016002391A - Pant-type absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pant-type absorbent article in which a side seal part can be easily torn from the side of a leg opening part, and a trouble and time when removed from a wearer can be reduced.SOLUTION: A pant-type absorbent article 1 of the present invention is formed of a pair of side seal parts 4 by bonding both side edges of a ventral part A with both side edges of a dorsal part B. Any one of a member 2A for forming the side part S of the ventral part A and a member for forming the side part S of the dorsal part B is an extension member 2B having an extension part 21b extending downward from the side seal part 4, and the other is a non-extension member 2A having no extension part. The non-extension member 2A has a multilayer area 40 with sheets laminated at two layers or more in a range within 2 cm in width from the lower end 4d of the side seal part, and a small layer area 41 positioned below the multilayer area 40 and having the number of sheets less than the multilayer area 40. The small layer area 41 forms a lower end of the non-extension member 2A in the part adjacent to the side seal part 4.

Description

  The present invention relates to a pants-type absorbent article.

Conventionally, an abdominal side portion disposed on the wearer's ventral side, a crotch portion disposed on the wearer's crotch portion, an hourglass-like outer covering material extending over the back side portion disposed on the wearer's back side, and the outer packaging An absorptive main body fixed to the inner surface side of the material, and both side edges of the outer packaging material on the abdominal side part and both side edges of the outer packaging material on the back side part are joined together to form a pair of side seal parts and a waist opening A pants-type absorbent article in which a part and a pair of leg openings are formed is known.
In addition, as a conventional pants-type absorbent article, the outer packaging material is divided into an abdominal sheet member disposed on the wearer's belly side and a back sheet member disposed on the wearer's back side, The absorptive main body is fixed so as to span the abdominal seat member and the back seat member, and the left and right side edges of the abdominal seat member and the left and right side edges of the back side seat member are a pair of sides. A pants-type absorbent article joined at a seal portion is known (for example, see Patent Document 1).

  Such a pant-type absorbent article tears the side seal part in the longitudinal direction of the diaper when it is removed for the purpose of disposal. However, in a conventional pant-type absorbent article, it is not always easy to tear the side seal part. There was no case.

Special table 2008-508082

  Therefore, the subject of this invention is providing the underpants type absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention includes an abdominal side portion disposed on the wearer's ventral side, a crotch portion disposed on the wearer's crotch portion, and a back side portion disposed on the wearer's back side, and both side edges of the abdominal side portion. A pants-type absorbent article in which a pair of side seal portions are formed by joining both side edges of the head portion and the back side portion, and a member forming the ventral side portion and the back side portion side Any one of the members forming the portion is an extending member having an extending portion that extends downward from the side seal portion, and the other has no extending portion that extends downward from the side seal portion. The non-extending member is an extending member, and the non-extending member is located within a range of 2 cm or less from the lower end of the side seal portion, and is positioned below the multilayer region, the multilayer region in which the sheets are laminated in two or more layers, A small-layer region in which the number of stacked sheets is smaller than the region, and the small-layer region is a portion adjacent to the side seal portion. Forming a lower end of the non-extending member in, there is provided a pant-type absorbent article.

  According to the underpants-type absorbent article of the present invention, the side seal portion can be easily torn from the leg opening side, and it is possible to reduce labor and time when removing it from the wearer.

FIG. 1 is a perspective view showing a usage state (wearing state) of a pants-type disposable diaper according to an embodiment of the present invention. FIG. 2 is a partially broken plan view showing a developed and extended state of the pants-type disposable diaper shown in FIG. In the expanded and extended state, the joints (side seal portions) existing on both sides of the diaper are peeled off to make the pant-type absorbent article in the expanded state, and the expanded absorbent article is stretched with the elastic members in each part. It is a state where it is expanded to the design dimension (same as the dimension when it is expanded in a flat shape with no influence of the elastic member). FIG. 3 is a partially broken enlarged view of the stretched state in which the abdomen side of the pant-type disposable diaper shown in FIG. 1 is viewed from the outer surface side of the diaper. FIG. 4 is a partially broken enlarged view of the stretched state of the back side portion of the pants-type disposable diaper shown in FIG. 1 as viewed from the outer surface side of the diaper. FIG. 5 is a schematic view showing a state in which the side seal portion of the pants-type disposable diaper and its both side portions shown in FIG. 1 are viewed from the inner surface side of the diaper. FIG. 6 is a view (corresponding to FIG. 5) showing a main part of another embodiment of the present invention. FIG. 7 is a view (corresponding to FIG. 5) showing a main part of still another embodiment of the present invention. FIG. 8 is a view showing a cross section along the diaper width direction of each stretchable part in the pants-type disposable diaper shown in FIG. 1, (a) is a state in which the elastic member is extended to eliminate wrinkles, and (b) is It is a figure which shows the state in which the elastic member contracts and the wrinkle is formed.

Hereinafter, the underpants type absorbent article of the present invention will be described based on preferred embodiments with reference to the drawings.
A pants-type disposable diaper 1 (hereinafter also simply referred to as diaper 1) according to an embodiment of the present invention, as shown in FIG. A crotch portion C located between the back side portion B and the abdominal side portion A and the back side portion B disposed on the back side of the wearer and disposed on the crotch portion of the wearer; The side edges of the part A and the side edges of the back part B are joined to form a pair of side seal parts 4, 4, a waist opening 5 and a pair of leg openings 6, 6.

  More specifically, as shown in FIGS. 1 and 2, the abdominal sheet member 2 </ b> A, the rectangular dorsal sheet member 2 </ b> B arranged on the back side of the wearer, the abdominal sheet member 2 </ b> A and the dorsal side An absorptive main body 3 that is stretched over and fixed to the seat member 2B, and the side edges 2a, 2a of the abdominal sheet member 2A and the side edges 2b, 2b of the back seat member 2B are joined, The pair of side seal portions 4 and 4 are formed. That is, the ventral sheet member 2A is a member that forms the ventral part A, and at the same time is a member that forms the side part of the ventral part A, and the dorsal sheet member 2B forms the dorsal part B. It is a member which forms the side part of the back side part B simultaneously with a member.

  Moreover, in the diaper 1, as shown in FIG.1 and FIG.2, the extension part which the back side seat member 2B which is a member which forms the side part S of the back side part B protrudes below from the side seal part 4 is shown. Non-extending that the abdominal sheet member 2A which is the extending member having 21b and which forms the side portion S of the abdominal side A does not have the extending portion extending below the side seal portion 4 It is a member. The side S of the ventral side A or the back side B has, for example, a width W1 continuous from the side edge of the ventral side A or the back side B, the side edge of the ventral side A or the back side B. To a side edge 3c of the absorbent main body 3 is 100% or less of the width W2, preferably 50% or less, and more preferably 20% or less (see FIG. 3).

  In the present specification, the diaper longitudinal direction (article longitudinal direction) is a direction extending from the abdominal side A through the crotch C to the back side B or the opposite direction (X direction in FIG. 2), and the diaper width. A direction (article width direction) is a direction along the wearer's waistline direction, and is a direction (Y direction in FIG. 2) intersecting the article longitudinal direction. Hereinafter, the diaper longitudinal direction (article longitudinal direction) is also simply referred to as the X direction, and the diaper width direction (article width direction) is simply referred to as the Y direction.

Hereinafter, the diaper 1 of this embodiment is demonstrated more concretely.
As shown in FIG. 2, the ventral seat member 2A has the same length La in the X direction as the length L4 of the side seal portion 4, and the ventral seat member 2A has side seal portions 4, 4 on the left and right sides. 4 has a main body portion 20a, but does not have an extension portion extending from the main body portion 20a to the crotch C side.
On the other hand, as shown in FIG. 2, the back seat member 2B has a length Lb in the X direction that is longer than a length L4 of the side seal portion 4, thereby having side seal portions 4 and 4 on both the left and right sides. A main body portion 20b and an extending portion 21b that extends from the main body portion 20b to the crotch C side and does not have the side seal portions 4 and 4 are formed on the left and right sides.
Hereinafter, the abdominal sheet member 2A (main body part 20a) is also referred to as the abdominal side main body part 20a, and the main body part 20b and the extension part 21b of the back side sheet member 2B are replaced by the back side main body part 20b and the back side extension part 21b. Also called.

  As shown in FIG. 2, the absorbent main body 3 of the diaper 1 has a liquid-permeable top sheet 31, a liquid-impermeable or water-repellent back sheet 32, and a liquid holding member disposed between both sheets 31 and 32. It is formed in a rectangular shape that is long in the X direction. The absorbent body 33 covers an absorbent core made of an aggregate of fibers such as pulp fibers (may be a non-woven fabric) or an absorbent core formed by holding particles of a water-absorbing polymer on the absorbent core. It consists of a core wrap sheet made of tissue paper or nonwoven fabric. The absorber 33 is also formed in a rectangular shape that is long in the X direction. The absorbent body 33 has the low-rigidity portions 33d on either side in the longitudinal direction where the absorbent core forming material does not exist or the basis weight of the forming material is smaller than that of the other portions.

  Side cuffs 34 and 34 made of a liquid-resistant or water-repellent and breathable material are formed on both sides in the longitudinal direction of the absorbent main body 3. In the vicinity of the free end of each side cuff 34, a side cuff elastic member 35 is arranged in an extended state. During wearing of the diaper 1, the side cuff 34 is raised by contraction of the side cuff elastic member 35, and the outflow of liquid from the absorbent main body 3 to the outside in the width direction is prevented. As the absorptive core and core wrap sheet of the top sheet 31, the back sheet 32, and the absorber 33, the same ones conventionally used for this type of absorbent article can be used. On the outer side of the absorbent main body 3, an exterior sheet such as a non-woven fabric or a film can be disposed on the back sheet 32.

  The ventral sheet member 2A has a horizontally long rectangular shape when the diaper 1 is expanded and extended (see FIG. 2), and a pair of left and right side edge portions 2a and 2a along the X direction, respectively along the Y direction. It has an upper edge 2c and a lower edge 2d. Similarly, when the diaper 1 is unfolded and extended (see FIG. 2), the back sheet member 2B has a horizontally long rectangular shape, and a pair of left and right side edges 2b and 2b along the X direction, and the Y direction. And has an upper edge 2c and a lower edge 2d. As shown in FIG. 2, the ventral sheet member 2A and the back sheet member 2B have a uniform length in the X direction in the Y direction.

  And the diaper 1 is obtained by joining the side edge 2a of the abdominal sheet member 2A and the side edge 2b of the back sheet member 2B (specifically, a joined part 2b ′). Further, the pair of side seal portions 4 and 4 described above are formed. For this joining, known joining means such as heat sealing, ultrasonic sealing, and adhesive are used. Moreover, the waist opening part 5 and a pair of leg opening parts 6 and 6 are formed with the side seal parts 4 and 4 by this joining.

  As for the absorptive main body 3, the one end side (part which overlaps the ventral sheet member 2A) of the longitudinal direction is fixed to the center area | region of the Y direction of the ventral sheet member 2A via an adhesive agent, and the other end of a longitudinal direction The side (portion overlapping the back sheet member 2B) is fixed to the central region in the Y direction of the back sheet member 2B via an adhesive.

  As shown in FIGS. 3 and 4, the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B in the diaper 1 are both an outer layer sheet 22 that forms the outer surface of the diaper, and an inner layer sheet that is disposed on the inner surface side of the outer layer sheet 22. 23 and a plurality of thread-like elastic members 24 disposed between the two sheets 22 and 23, and a waist stretchable part G1 and a waistline stretchable part on the abdominal body part 20a and the back body part 20b, respectively. G2 is formed, and the extension part stretchable part G3 is formed in the back side extension part 21b.

  The waist stretchable part G1 is formed outward from the longitudinal ends 3a, 3b of the absorbent main body 3 in the X direction in each of the abdominal sheet member 2A and the back sheet member 2B. The waistline elastic part G2 is formed below the waist elastic part G1 in the X direction in each of the abdominal body part 20a and the back body part 20b. The extension part stretchable part G3 is formed in the back side extension part 21b. The waistline stretchable part G2 and the extended part stretchable part G3 are each formed at least in the Y direction at portions located outward from both side edges 3c, 3c of the absorbent main body 3.

  In the diaper 1, as shown in FIG.3 and FIG.4, the waist expansion-contraction part G1 expresses a stretching property over the whole region between the side part adhesion areas 27 and 27 in the abdominal sheet member 2A or the back sheet member 2B. On the other hand, the waistline stretchable part G2 and the extended part stretchable part G3 express stretchability on the outer sides of both side edges of the absorbent main body 3, and particularly overlap with the absorbent main body 3, It forms in the state divided | segmented into the right and left of the diaper 1 so that elasticity may not be expressed in the part which overlaps the width direction center part of the absorptive main body 3. FIG.

  A plurality of elastic members 24 are spaced apart in the longitudinal direction of the diaper so that each of the abdominal body 20a, the back body 20b, and the back extension 21b extends along the diaper width direction. Opened and arranged in an extended state.

As shown in FIG. 5, the ventral sheet member 2 </ b> A in the diaper 1 includes a multilayer region 40 in which two or more sheets are laminated in a range within 2 cm from the lower end 4 d of the side seal portion 4, and the multilayer region 40. And a small layer region 41 in which the number of stacked sheets is smaller than that of the multilayer region 40. More specifically, in the multilayer region 40, two sheets of the outer layer sheet 22 and the inner layer sheet 23 are laminated, and the small layer region 41 is one outer layer extending from the lower end 23b of the inner layer sheet 23. It consists only of the sheet 22. And the small layer area | region 41 forms the lower edge part 2d used as the lower end of the stomach side sheet member 2A (non-extending member) in the site | part adjacent to the side seal part 4.
The reason why the multilayer region 40 and the small layer region 41 are within the range of 2 cm from the lower end 4d of the side seal portion 4 is that the lower end of the ventral sheet member 2A (non-extending member) is extended to the multilayer region 40. If the distance is too large, the force is less likely to concentrate when the side seal portion 4 is torn, and the breakage of the small layer region 41 is not easily transmitted to the multilayer region 40.

The diaper 1 of this embodiment can be worn in the same manner as a normal pants-type disposable diaper, and can be easily removed from the wearer after tearing by tearing the side seal portion.
According to the diaper 1 of the present embodiment, as described above, only the back seat member 2B extends from the lower end of the side seal portion 4, and there is a step between the back seat member 2B and the ventral seat member 2A. On the upper side, the lower end of the portion adjacent to the side seal portion 4 of the ventral sheet member 2A, which is a non-extending member, is formed from the small layer region 41 described above. When the side part B is grasped by hand and the side seal part 4 is torn from the leg opening part 6 side, the force is easily applied to the small layer region 41 adjacent to the side seal part 4 and the sheets are laminated. The small layer region 41 having a small number of sheets is easily broken. Thereby, the initial force for tearing the side seal portion 4 can be reduced, and it is also easy to tear the entire side seal portion 4 when the small layer region 41 breaks.
Thus, according to the diaper 1 of this embodiment, the side seal part 4 can be easily torn from the leg opening part 6 side, and the effort and time which are required at the time of disposal can be reduced.

From the viewpoint of more surely achieving such an effect, the number of sheets stacked in the small layer area 41 is preferably one, and the sheets are stacked in a portion of the multilayer area 40 adjacent to the small layer area 41. The number of sheets is more preferably one more than that of the small layer region 41.
From the same viewpoint, as shown in FIG. 5, it is preferable that the elastic member 24 is not disposed in the small layer region 41.

  Further, from the same viewpoint, the length L3 along the diaper (article) longitudinal direction X of the small layer region 41 is preferably 2 mm or more, more preferably 5 mm or more, and the ease of tearing of the side seal portion 4 is improved. From the viewpoint, it is preferably 15 mm or less, more preferably 10 mm or less, and preferably 2 mm or more and 15 mm or less, more preferably 5 mm or more and 10 mm or less.

  Further, as in the present embodiment, providing the extending portion 21b on the back sheet member 2B and providing the small layer region 41 on the abdominal sheet member 2A provides the extending portion on the abdominal sheet member 2A, Compared with the case where a small layer region is provided in the side sheet member 2B, the extension portion is less likely to be turned when the knee is bent during wearing. Further, it is possible to prevent the small-layer region from becoming difficult to pick up when discarded by turning up.

Further, when tearing the side seal portion, the tear generated on the ventral sheet member 2A (non-extending member) side having the small layer region 41 is difficult to move to the back side sheet member 2B (extending member) side, From the viewpoint of being able to tear continuously and smoothly, it is preferable that the breaking strength of the ventral sheet member 2A (non-extending member) is weaker than the breaking strength of the dorsal sheet member 2B (extending member).
The strength of the breaking strength is such that the multilayer region 40 adjacent to the small layer region 41 and the corresponding region 40M on the extending member side facing the multilayer region 40 across the side seal portion 4 as shown in FIG. Measure and compare the breaking strength. The method for measuring the breaking strength in each region is as follows.
(Measurement method of breaking strength)
First, from the part adjacent to the side seal part 4, the length in the width direction (Y direction) of the diaper is 50 mm from the multilayer region 40 and the corresponding region 40M on the extending member side facing the multilayer region 40, respectively. The sample sheet is obtained by cutting the diaper into a rectangular shape having a length in the longitudinal direction (X direction) of 30 mm. The obtained sample sheet is held between chucks (20 mm distance between chucks) of a Tensilon tensile tester (Orientec, trade name “RTA-100”), and then pulled in the Y direction of the sample sheet. Tensile at 300 mm / min and measured the strength when it breaks, and this is taken as the breaking strength. In addition, a measured value is computed by the 5-point average which measured the said sample sheet.

The breaking strength of the multilayer region 40 adjacent to the small layer region 41 is preferably 30 N / 30 mm or more, more preferably 50 N / 30 mm or more, preferably 70 N / 30 mm or less, more preferably 60 N / 30 mm or less. Specifically, it is preferably 30 N / 30 mm or more and 70 N / 30 mm or less, more preferably 50 N / 30 mm or more and 60 N / 30 mm or less.
The difference between the breaking strength of the multilayer region 40 adjacent to the small layer region 41 and the breaking strength of the corresponding region 40M on the extending member side facing the multilayer region 40 is preferably 10 N / 30 mm or more, more preferably Is 20 N / 30 mm or more, preferably 50 N / 30 mm or less, more preferably 40 N / 30 mm or less, more specifically preferably 10 N / 30 mm or more and 50 N / 30 mm or less, more preferably 20 N / 30 mm or more and 40 N. / 30 mm or less.

Further, as shown in FIG. 5, the ventral sheet member 2 </ b> A (non-extending member) of the diaper 1 of the present embodiment has an inelastic region 42 at the lower end of the portion forming the side part of the ventral part A. Have.
The inelastic region 42 is not provided with the elastic member 24 in the region itself, but on the side of the extending member (in this embodiment, the back seat member 2B) facing each other with the side seal portion 4 interposed therebetween. The corresponding region 42M is a region where the elastic member 24 is disposed. The inelastic region 42 is a region that continuously exists from the lower end of the non-extending member (the ventral sheet member 2A in the present embodiment), and the region between the elastic members 24 is the non-elasticized region 42. Absent. The elastic member 24 is an elastic member that imparts stretchability in the article lateral direction (Y direction) to the abdomen or back side, and is usually arranged along the article lateral direction (Y direction). It is.

  The inelastic region 42 has a width W3 (see FIG. 5, length in the article longitudinal direction X) from the lower end of the non-extending member (in the present embodiment, the ventral sheet member 2A), preferably 10 mm or more, and more preferably Is 15 mm or more, preferably 30 mm or less, more preferably 25 mm or less, more specifically, preferably 10 mm or more and 30 mm or less, more preferably 15 mm or more and 25 mm or less.

  Moreover, when tearing the side seal part of the diaper after wearing by forming such an inelastic area 42 in the ventral sheet member 2A (non-extending member), the vicinity of the lower end 4d of the side seal part 4 Since it becomes easy to pick up, it becomes easier to tear a side seal part. That is, since the elastic member is not provided, the sheet in the non-elastic region 42 is not in close contact with the body and is in a floating state, so that it is easy to hold and hold.

In addition, in the ventral sheet member 2A (non-extending member) in the diaper 1 of the present embodiment, the small layer region 41 described above constitutes a part of the inelastic region 42 as shown in FIG. The elastic member 24 is disposed in a corresponding region 41M on the extending member side (in the present embodiment, the back seat member 2B) opposite to the small layer region 41 with the side seal portion 4 interposed therebetween.
When the small layer region 41 is pinched and pulled in the direction opposite to the side seal portion 4 side, if the corresponding region 41M corresponding to the small layer region 41 is pulled in the opposite direction due to contraction of the elastic member, The tearing force can be reduced. If there is no elastic member in the portion corresponding to the small layer region 41, it may be difficult to tear by being pulled together at the time of tearing.

6 and 7 are views corresponding to FIG. 5 in a pants-type disposable diaper according to another embodiment of the present invention. 6 and 7 also provide the above-described effect by having the inelastic region 42 in the abdominal sheet member 2A (non-extending member), and the embodiment shown in FIG. The above-described effect is achieved by having the elastic member 24 in the corresponding region 41M on the extending member side (the back seat member 2B) where the layer regions 41 face each other.
Regarding the embodiment shown in FIG. 6 and FIG. 7, points that are not particularly described are the same as those of the diaper 1 described above, and the same components are denoted by the same reference numerals and the description thereof is omitted.

The diaper 1 of the above-described embodiment will be further described with reference to FIGS. 3, 4, and 8. In any of the stretchable parts G <b> 1 to G <b> 3 of the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B, the outer layer sheet 22. And the inner layer sheet 23 are joined at a large number of fused portions (joined portions) 26 formed in the form of dots, and the elastic member 24 is arranged so as not to pass through the fused portions 26. ing.
More specifically, in the expansion / contraction portions G1 to G3, a plurality of rows of junction portions in which the junction portions 26 are intermittently arranged in series in the X direction are formed in the Y direction. The X direction of each junction is coincident.
And in any of the expansion-contraction parts G1-G3 of 2A of ventral | abdominal sheet members and the back | dorsal sheet | seat member 2B, the some elastic member 24 is distribute | arranged so that each may pass between the junction parts 26 adjacent in a X direction. Yes. In addition, each elastic member 24 is fixed between the sheets 22 and 23 in a side bonding region 27 or an absorbent main body bonding region 28 described later, and in other portions, the elastic members 24 are attached to any of the sheets 22 and 23. Also not fixed.

As shown in FIG. 3, the ventral sheet member 2 </ b> A is a side where the outer layer sheet 22 and the inner layer sheet 23 are bonded to each other at the side edges 2 a and 2 a of the ventral sheet member or in the vicinity thereof via an adhesive. A partial adhesion region 27 is provided. Further, the abdominal sheet member 2A has an absorbent main body-side adhesive region 28 in which the outer layer sheet 22 and the inner layer sheet 23 are joined together with an adhesive, closer to the center side in the diaper width direction than the side adhesive region 27. doing.
As shown in FIG. 4, the back side sheet member 2B is a side where the outer layer sheet 22 and the inner layer sheet 23 are bonded to each other at the side edges 2b, 2b of the back side sheet member or in the vicinity thereof via an adhesive. A partial adhesion region 27 is provided. Further, the back sheet member 2B also has an absorbent main body-side adhesive region 28 in which the outer layer sheet 22 and the inner layer sheet 23 are bonded to each other in the diaper width direction center side from the side adhesive region 27 through an adhesive. doing.

  And in any of the abdominal sheet member 2A and the back sheet member 2B, the elastic member 24 disposed in the waist stretchable part G1 is fixed between the sheets 22 and 23 in the pair of side part adhesion regions 27, respectively. On the other hand, it is not fixed to any of the sheets 22 and 23 between the side adhesion regions 27. On the other hand, in any of the abdominal sheet member 2A and the back sheet member 2B, the elastic member 24 disposed in the waistline expansion / contraction part G2 or the extension part expansion / contraction part G3 includes the side adhesion region 27 and the absorbent main body side adhesion region. 28 is fixed between the sheets 22 and 23, but is not fixed to any of the sheets 22 and 23 between the side adhesive region 27 and the absorbent main body side adhesive region 28. As shown in FIGS. 3 and 4, the absorbent main body-side adhesive region 28 has an end on the outer side in the diaper width direction located on the inner side (center side) in the diaper width direction from the position of the side edge 3 c of the absorbent main body 3. However, instead of this, it may be formed so as to extend inside or outside the side edge 3c of the absorbent main body 3, or may be formed outward of the side edge 3c of the absorbent main body 3 in the diaper width direction. You can also.

  In the waist stretchable part G1, the waistline stretchable part G2 and the extended part stretchable part G3, the elastic member 24 contracts, so that the sheets 22 and 23 between the adjacent joining part rows are deformed so as to bulge outward, A flange 29 made of the sheet 22 or the sheet 23 is formed between the adjacent joint rows, and a hollow portion 30 surrounded by the flange 29 and the flange 29 is formed between the sheets 22 and 23 (see FIG. 8).

  The length L6 (see FIG. 2) of the back-side extending part 21b is preferably 5 to 60%, particularly 20 to 40%, of the length Lb (see FIG. 2) of the back-side sheet member 2B. Moreover, in the case of the diaper for infants, it is preferable that the length L6 of the back side extension part 21b is 10-100 mm, More preferably, it is 20-60 mm. In the case of an adult diaper, the length L6 of the dorsal extending portion 21b is preferably 10 to 150 mm, more preferably 20 to 100 mm. The same applies to the preferred length and ratio of the extending portion when the ventral sheet member (abdominal side portion) side is extended below the side seal portion 4.

  In the diaper 1 of the above-described embodiment, the outer layer sheet 22 and the inner layer sheet 23 have extended folded portions 22a and 23a that are folded back to the inner layer sheet 23 side at the upper edge portion 2c that forms the opening peripheral edge of the waist opening. The extended folded portions 22a and 23a are joined to the unfolded portions of the outer layer sheet 22 and the inner layer sheet 23 in the side seal portion 4 and overlap with the longitudinal direction of the absorbent main body 3 Is bonded to the surface of the absorbent main body 3 on the surface sheet 31 side by an adhesive.

  As the outer layer sheet 22 and the inner layer sheet 23, various sheet materials conventionally used for this type of article can be used without particular limitation, but is preferably a non-woven fabric, particularly from the viewpoint of flexibility and the like. It is preferably a single-layer nonwoven fabric or a laminated nonwoven fabric of two or more layers composed of a through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, or the like. Moreover, the sheet | seat which integrated these nonwoven fabrics and films may be sufficient. As a forming material of the elastic member 24, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As the form of the elastic member, it is preferable to use a thread-like (thread rubber etc.) or string-like (flat rubber etc.) cross-section having a rectangular, square, round, polygonal cross section, or a multifilament type thread-like one. it can.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, a pants-type absorbent article according to the present invention includes a continuous hourglass-shaped outer packaging material extending over the abdomen, the crotch portion, and the back side, and an absorbent main body fixed to the inner surface side of the outer packaging material, Pants-type absorption in which a pair of side seal portions, a waist opening portion, and a pair of leg openings are formed by joining both side edge portions of the outer packaging material on the ventral side portion and both side edge portions of the outer packaging material on the back side portion It may be a property article. That is, the member that forms the side portion of the ventral side portion and the member that forms the side portion of the dorsal side portion may be two portions of continuous members.

  Further, as in the diaper 1 described above, the dorsal sheet member 2B (the member forming the side part of the dorsal side part) is an extending member having an extending part extending downward from the side seal part 4, and the ventral side Instead of the sheet member 2A (the member forming the side portion of the ventral side portion) being a non-extending member that does not have the extending portion extending downward from the side seal portion 4, the ventral side sheet member 2A (belly side member) The member that forms the side portion of the side portion) is an extending member that has an extending portion that extends downward from the side seal portion 4, and the back sheet member 2B (the member that forms the side portion of the back side portion) is the side. It is good also as a non-extending member which does not have the extension part extended below from the seal part 4. FIG.

  The small layer region 41 may be composed of the inner layer sheet 23 extending from the lower end of the outer layer sheet 22 instead of the outer layer sheet 22 extending from the lower end 23 b of the inner layer sheet 23. Further, in the small layer region 41, the number of stacked sheets may be two or more. Further, either one or both of the outer layer sheet 22 and the inner layer sheet 23 may not have the above-described extended folded portions 22a and 23a.

  Further, the abdominal sheet member 2A and the back sheet member 2B are replaced with one having a dot-shaped joint portion 26 formed so as not to overlap the elastic member 24, and the outer layer sheet 22 forming the outer surface of the diaper and its It may have a structure in which the inner layer sheet 23 arranged on the inner side is bonded in the entire region. Further, the waist stretchable part G1, the waistline stretchable part G2, and the extended part stretchable part G3 each have an outer layer sheet 22 that forms the outer surface of the diaper and an inner layer sheet 23 disposed on the inside thereof in the entire region. It may have a bonded structure. Further, the waist elastic part G2 may be formed so as to extend over the entire width of the abdominal sheet member 2A and / or the back sheet member 2B, and the extending part elastic part G3 may also be formed in the abdominal sheet member 2A and / or the back. You may form so that the full width of the side sheet | seat member 2B may be covered.

  Further, the side seal portion 4 is formed by joining the side edges 2a and 2b of the ventral side and the back side seat member, but the ventral side seat member 2A and the back side seat member 2B are formed outside the side seal portion 4. And may have a non-joined portion with a narrow width (for example, more than 0 mm and not more than 20 mm).

The pants-type absorbent article may be a pants-type sanitary napkin or the like in addition to a pants-type disposable diaper for infants or adults.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

This invention discloses the following underpants type absorbent articles regarding embodiment mentioned above.
<1>
A ventral side portion disposed on the wearer's ventral side, a crotch portion disposed on the wearer's crotch portion, and a dorsal side portion disposed on the wearer's dorsal side, both side edges and dorsal side of the ventral side portion A pants-type absorbent article in which both side edges of the part are joined to form a pair of side seal parts,
Either one of the member forming the side portion of the ventral side portion and the member forming the side portion of the back side portion is an extending member having an extending portion extending downward from the side seal portion, and the other is It is a non-extending member that does not have an extending part that extends downward from the side seal part,
The non-extending member is located within a range of 2 cm or less from the lower end of the side seal portion, a multilayer region in which sheets are laminated in two or more layers, and is positioned below the multilayer region, and the sheets are laminated more than the multilayer region. A pants-type absorbent article having a small-layer region with a small number of sheets, and the small-layer region forms a lower end of the non-extending member in a portion adjacent to the side seal portion.

<2>
The length L3 along the article longitudinal direction X of the small layer region is preferably 2 mm or more, more preferably 5 mm or more, preferably 20 mm or less, more preferably 15 mm or less, the pants according to <1>. Mold absorbent article.
<3>
The member forming the side portion of the back side portion is the extending member, and the member forming the side portion of the ventral side portion is the non-extending member, according to <1> or <2>. Pants-type absorbent article.
<4>
The pants-type absorbent article according to any one of <1> to <3>, wherein the small-layer region has one sheet.
<5>
The pants type according to any one of <1> to <4>, wherein the number of sheets stacked in a portion adjacent to the small layer region in the multilayer region is one more than the small layer region. Absorbent article.
<6>
The underpants-type absorbent article according to any one of <1> to <5>, wherein the breaking strength of the non-extending member is weaker than the breaking strength of the extending member.
<7>
The pants-type absorbent article according to any one of <1> to <6>, wherein no elastic member is disposed in the small layer region.
<8>
The non-extending member has an inelastic region at a lower end portion of a portion that forms a side portion of a ventral side portion or a dorsal side portion,
In the non-elasticized region, the extended member is opposed to the region itself, although an elastic member that expands or contracts the abdomen portion or the dorsal portion in the width direction is not disposed in the region itself. The pants type absorptivity according to any one of <1> to <7>, wherein the corresponding region on the side is a region in which an elastic member that expands or contracts the back side portion or the abdominal side portion in the width direction is arranged. Goods.
<9>
The small layer region constitutes a part of the non-elastic region, and the elastic member is disposed in a corresponding region on the extension member side opposite to the small layer region with the side seal portion interposed therebetween. The pants-type absorbent article according to <8>, which is disposed.

<10>
An abdominal sheet member disposed on the wearer's ventral side, a dorsal sheet member disposed on the wearer's dorsal side, and an absorptive main body secured over the abdominal sheet member and the dorsal sheet member; And the both side edges of the ventral sheet member and the both side edges of the back seat member are joined to form the pair of side seal parts,
Any one of the above items <1> to <9>, wherein the ventral sheet member is a member forming a side portion of the ventral side portion, and the dorsal sheet member is a member forming a side portion of the dorsal side portion. The pants-type absorbent article described in 1.
<11>
The absorbent main body has a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and a liquid-retaining absorbent disposed between both sheets, and is long in the longitudinal direction of the article. The pants-type absorbent article according to <10>, which is formed in a rectangular shape.
<12>
The absorbent body is formed in a rectangular shape that is long in the longitudinal direction of the article, and the absorbent body has no absorbent core forming material on either side of the longitudinal direction or the basis weight of the formed material is other than that. The underpants-type absorbent article according to <10> or <11>, wherein the pants-type absorbent article has less rigid portions than the portions.
<13>
Any one of the above <10> to <12>, wherein side cuffs made of a liquid-resistant or water-repellent and breathable material are formed on both sides in the longitudinal direction of the absorbent main body. The pants-type absorbent article described in 1.

<14>
The ventral sheet member is a non-extending member;
The ventral seat member has an abdominal body portion having side seal portions on both left and right sides, and the back seat member has a back body portion having side seal portions on both left and right sides, and a crotch from the back side body portion. The underpants-type absorbent article according to any one of <10> to <13>, wherein the pants-type absorbent article has a back-side extending portion that extends to a portion side and does not have a side seal portion on both right and left sides.
<15>
Each of the abdominal body part, the back body part, and the back extension part has a plurality of elastic members extending along the article width direction and spaced apart in the article longitudinal direction. The pants-type absorbent article according to <14>, which is arranged in an elongated state.
<16>
Each of the ventral sheet member and the dorsal sheet member is an outer layer sheet that forms the outer surface of the diaper, an inner layer sheet disposed on the inner surface side of the outer layer sheet, and a plurality of thread-like elastic members disposed between the two sheets. With a member,
<14> or above, wherein a waist stretchable portion and a waistline stretchable portion are formed in the abdominal body portion and the dorsal body portion, respectively, and an extension portion stretchable portion is formed in the dorsal extension portion. The underpants-type absorbent article according to <15>.
<17>
The waist stretchable portion is formed outward from the longitudinal end of the absorbent main body in the longitudinal direction of the article in each of the ventral sheet member and the backsheet member, and the waistline stretchable portion is The pants-type absorbent article according to <16>, wherein each of the side main body part and the back side main body part is formed below the waist stretchable part in the longitudinal direction of the article.
<18>
<16> or <17>, wherein the waistline stretchable part and the extension part stretchable part are each formed at least on the outer side of each side edge of the absorbent main body in the article width direction. The pants-type absorbent article described in 1.
<19>
The waist stretchable part is formed so as to exhibit stretchability across the entire region between the side adhesion regions in the ventral sheet member or the back sheet member, and the waist stretchable part and the extension stretchable part are The pants are formed so as to exhibit stretchability on the outer side edges of the absorbent main body, and not to exhibit stretchability in a portion overlapping the absorbent main body, preferably in a portion overlapping the central portion in the width direction of the absorbent main body. The pants-type absorbent article according to any one of <16> to <18>, wherein the pants-type absorbent article is formed in a state divided into left and right sides of the mold absorbent article.

<20>
In the waist stretchable part, the waistline stretchable part, and the extending part stretchable part of the abdominal side sheet member and the back side sheet member, a large number of dots are formed between the outer layer sheet and the inner layer sheet, respectively. <16> to <19>, wherein the elastic members are arranged so as not to pass through the joint portions (preferably the fusion portions). The underpants type absorbent article according to any one of the above.
<21>
Each of the waist stretchable part, the waistline stretchable part, and the extending part stretchable part is formed with a plurality of rows of joint portions in which the joint portions are intermittently arranged in series in the article longitudinal direction. The pants-type absorbent article according to the above <20>, wherein the positions in the article longitudinal direction of the joints in the joint row are the same.
<22>
In the waist stretchable part, the waistline stretchable part, and the extension stretchable part of the abdominal sheet member and the back sheet member, a plurality of elastic members respectively pass between adjacent joints in the longitudinal direction of the article. The pants-type absorbent article according to any one of <16> to <21>, which is arranged as described above.
<23>
While the elastic member is fixed between the sheets in the side adhesion region or the absorbent main body side adhesion region, in other parts, it is not fixed to any of those sheets, <1> to The underpants type absorbent article according to any one of <22>.
<23>
The length L6 in the article longitudinal direction of the back extension part is 5 to 60% of the length Lb in the same direction of the back sheet member, preferably 20 to 40%, <14> to The underpants type absorbent article according to any one of <22>.
<24>
The pants-type absorbent article is a diaper for infants, and the length L6 of the extension part of the extension member or the back side extension part is 10 to 100 mm, preferably 20 to 60 mm. The underpants type absorbent article according to any one of 1 to <23>.
<25>
The pants-type absorbent article is an adult diaper, and the length L6 of the extension part of the extension member or the back side extension part is 10 to 150 mm, preferably 20 to 100 mm. 1>-<23> The underpants type absorbent article according to any one of the above.

1 Pants-type disposable diapers (pants-type absorbent articles)
2A Ventral sheet member (member forming the side of the ventral side)
20a Abdominal side main body part 22 Outer layer sheet 23 Inner layer sheet 2B Back side sheet member (member which forms the side part of a back side part)
20b Back side main body part 21b Extension part 22 Outer layer sheet 23 Inner layer sheet 24 Elastic member 3 Absorbent main body 31 Top sheet 32 Back sheet 33 Absorber 4 Side seal part 4d Lower end 5 Waist opening 6 Leg opening 40 Multilayer area 40M Multilayer Corresponding region of the region 41 Small layer region 41M Corresponding region of the small layer region 42 Inelastic region 42M Corresponding region of the inelastic region

Claims (8)

A ventral side portion disposed on the wearer's ventral side, a crotch portion disposed on the wearer's crotch portion, and a dorsal side portion disposed on the wearer's dorsal side, both side edges and dorsal side of the ventral side portion A pants-type absorbent article in which both side edges of the part are joined to form a pair of side seal parts,
Either one of the member forming the side portion of the ventral side portion and the member forming the side portion of the back side portion is an extending member having an extending portion extending downward from the side seal portion, and the other is It is a non-extending member that does not have an extending part that extends downward from the side seal part,
The non-extending member is located within a range of 2 cm or less from the lower end of the side seal portion, a multilayer region in which sheets are laminated in two or more layers, and is positioned below the multilayer region, and the sheets are laminated more than the multilayer region. A pants-type absorbent article having a small-layer region with a small number of sheets, and the small-layer region forms a lower end of the non-extending member in a portion adjacent to the side seal portion.   The member which forms the side part of a back side part is the said extending member, The member which forms the side part of an abdominal side part is the said non-extending member, The underpants type absorbent article of Claim 1 .   The pants-type absorbent article according to claim 1 or 2, wherein the small-layer region has one sheet laminated.   The underpants type absorbent article according to any one of claims 1 to 3, wherein a breaking strength of the non-extending member is weaker than a breaking strength of the extending member. An abdominal sheet member disposed on the wearer's ventral side, a dorsal sheet member disposed on the wearer's dorsal side, and an absorptive main body secured over the abdominal sheet member and the dorsal sheet member; And the both side edges of the ventral sheet member and the both side edges of the back seat member are joined to form the pair of side seal parts,
The ventral sheet member is a member that forms a side part of the ventral side part, and the back side sheet member is a member that forms a side part of the dorsal side part. Pants-type absorbent article.   The pants-type absorbent article according to any one of claims 1 to 5, wherein an elastic member is not arranged in the small layer region. The non-extending member has an inelastic region at a lower end portion of a portion that forms a side portion of the ventral side portion or the dorsal side portion,
In the non-elasticized region, the extended member is opposed to the region itself, although an elastic member that expands or contracts the abdomen portion or the dorsal portion in the width direction is not disposed in the region itself. The pants-type absorbent article according to any one of claims 1 to 6, wherein the corresponding region on the side is a region in which an elastic member for expanding and contracting the back side portion or the ventral side portion in the width direction is arranged. The small layer region constitutes a part of the non-elastic region, and the elastic member is disposed in a corresponding region on the extension member side opposite to the small layer region with the side seal portion interposed therebetween. The pants-type absorbent article according to claim 7, which is arranged.

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