JP2012148069A - Pull-up absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pull-up absorbent article excelling in a covering property of the buttocks and hardly causing slip-off and worsening of appearance while wearing in spite of the pull-up absorbent article efficiently manufacturable with a wrapping material divided into an abdomen side sheet member and a back side sheet member.SOLUTION: The pull-up absorbent article 1 includes the abdomen side sheet member 2A, the back side sheet member 2B, and an absorbent body 3 fixed across them. The abdomen side sheet member 2A and the back side sheet member 2B include body parts 20a and 20b and extended parts 21a and 21b expanded/contracted in the width direction of a diaper. When the extended part 21b of the back side sheet member 2B is divided into an upper back side extended part B4 and a lower back side extended part B5, the upper back side extended part B4, and a portion corresponding to the upper back side extended part B4 in the abdomen side sheet member are greater in contraction stress in an article width direction per unit length in an article longitudinal direction than the lower back side extended part B5.

Description

  The present invention relates to a pants-type absorbent article such as a disposable diaper.

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 a side edge of the outer packaging material on the abdominal side and a side edge of the outer packaging material on the back side are joined to each other, and a waist opening and a pair of leg openings A pants-type absorbent article in which is formed is known.
When such a pants-type absorbent article is continuously produced, it is common to form a through hole or notch for forming a leg opening in the belt-shaped raw material of the outer packaging material and remove unnecessary portions as trims. It is.

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 absorbent main body is fixed so as to be bridged over the abdominal sheet member and the back sheet member, and the left and right side edges of the abdominal sheet member are joined to the left and right side edges of the back side sheet member. There are known pant-type absorbent articles.
For example, Patent Document 1 includes, as such a pant-type absorbent article, an annular elastic belt composed of a front belt portion and a rear belt portion and an absorbent main body, and a longitudinal portion of the rear belt portion (back side seat member). A pull-on garment is described in which the length in the direction is longer than the length in the longitudinal direction of the front belt portion (ventral side seat member).

Further, Patent Document 2 includes a cylindrical waistline portion and an absorbent main body formed from a ventral side exterior sheet and a back side exterior sheet, and the back side exterior sheet extends to the back side body part and the lower side thereof. An extension portion of the second elastic elastic member provided on the buttock cover portion extending on both sides of the portion overlapping the absorbent main body in the back side extension portion. A pants-type disposable diaper is described in which the stretch rate of the first elastic elastic member provided at the middle and lower end of the side body is higher.
Patent Document 3 also includes a cylindrical waistline portion and an absorbent main body formed from a ventral side exterior sheet and a back side exterior sheet, and the back side exterior sheet extends to the back side body part and the lower side thereof. A pants-type paper diaper having a dorsal extending portion is described, and the publication describes that the abdominal exterior sheet may also have an abdominal body portion and an abdominal extending portion. Has been.

Special table 2008-508082 JP 2008-178682 A JP 2008-212249 A

  The pants-type absorbent article in which the outer packaging material is divided into an abdominal sheet member disposed on the wearer's ventral side and a dorsal sheet member disposed on the wearer's dorsal side is, for example, an abdominal sheet member While the belt-shaped original fabric and the belt-shaped original fabric of the back side sheet member are transported apart, the absorbent main body is intermittently fixed so as to be bridged between the two, and then the belt-shaped original fabric of the ventral side sheet member After folding in half so that the belt-like raw material of the back side sheet member overlaps, it is joined by forming the side seal part, and at the same time or after that, it is cut and divided into individual disposable diapers. Compared to the case where a through hole or a notch for forming a leg opening is formed in a wide outer packaging material in which a portion arranged on the ventral side and a portion arranged on the back side can be manufactured, Trims that do not need or need to be removed from the outer packaging material It can be made of miniaturization.

However, in the pull-on garment described in Patent Document 1, the back belt portion (back side seat member) is longer than the front belt portion (abdominal side seat member), so that the coverage of the heel portion is excellent. The fit of the part (the dorsal extension part) to the skin is inferior, and inconvenience such as turning over tends to occur in the part. In addition, since there is no front-side extension portion, the skin cannot be completely covered when viewed as clothes at the time of wearing, resulting in an appearance problem.
In the pants-type paper diapers of Patent Documents 2 and 3, since the lower end of the back sheet member is processed into a curved shape, it is necessary to remove the trim at the time of manufacture, and the covering property of the buttocks is also inferior. Furthermore, there is no suggestion for the problem that slippage is likely to occur during wearing in the conventional pant-type absorbent article in which the outer packaging material is divided into the abdominal sheet member and the back sheet member. Is the current situation.

  Therefore, the present invention is a pant-type absorbent article in which the outer packaging material is divided into the abdominal sheet member and the back sheet member and can be efficiently manufactured, but has excellent coverage of the buttock and slips off during wearing. The present invention relates to a pants-type absorbent article in which deterioration of appearance and appearance hardly occur.

  The present invention relates to a rectangular ventral sheet member disposed on the wearer's ventral side, a rectangular dorsal sheet member disposed on the wearer's dorsal side, an abdominal sheet member, and a dorsal sheet member. A pants-type absorbent article having a waist opening and a pair of leg openings, the abdomen seat member and the back seat member respectively on the left and right sides A main body portion having a side seal portion, an extension portion extending from the main body portion toward the crotch portion and not having a side seal portion on both right and left sides, and the extending portion of the back seat member, When divided into two in the longitudinal direction of the article and divided into an upper part of the back side extension part and a lower part of the back side extension part, the main body part and the extension part of the abdominal sheet member, and the back side sheet member The main body, the upper part of the back side extension part, and the lower part of the back side extension part are all articles. The width of the article per unit length in the longitudinal direction of the article is respectively the portion corresponding to the upper part of the back side extension part and the upper part of the back side extension part of the ventral sheet member. A pants-type absorbent article having a direction shrinkage stress larger than the shrinkage stress of the lower portion of the back side extension portion is provided.

  The pants-type absorbent article of the present invention is a pants-type absorbent article whose outer packaging material is divided into an abdominal sheet member and a dorsal sheet member and can be efficiently manufactured, but has excellent coverage of the buttocks and is worn It does not easily slip down or deteriorate in appearance.

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 diagram 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 is a rectangular abdominal sheet member disposed on the abdomen side of a wearer as shown in FIGS. 2A, a rectangular dorsal sheet member 2B arranged on the back side of the wearer, and an absorptive main body 3 that is bridged over and fixed to the abdominal sheet member 2A and the dorsal sheet member 2B. The side edge portions 2a, 2a of the side seat member 2A and the side edge portions 2b, 2b of the back side seat member 2B are joined to form a pair of side seal portions 4, 4.

  As shown in FIG. 1 and FIG. 2, the diaper 1 is, when worn, an abdominal side A disposed on the abdomen side of the wearer, a dorsal side B disposed on the back side of the wearer, and an abdomen side part. It has a crotch part C which is located between A and the back side part B and is arranged in a wearer's crotch part. 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 direction (article width direction) is It is a direction along a wearer's waist direction, and is a direction (Y direction in FIG. 2) that intersects the longitudinal direction of the article. 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.

As shown in FIG. 2, the side seal portion 4 is formed such that the length in the X direction is shorter than both the length La of the abdominal seat member 2A and the length Lb of the back seat member 2B. Each of the side seat member 2A and the back side seat member 2B has main body portions 20a and 20b having side seal portions 4 and 4 on both left and right sides, and extends from the main body portions 20a and 20b to the crotch C side, and side on both left and right sides. The extension parts 21a and 21b which do not have the seal parts 4 and 4 are formed.
Hereinafter, the body part 20a and the extension part 21a of the abdominal sheet member 2A are also referred to as the abdomen body part 20a and the abdomen extension part 21a, and the body part 20b and the extension part 21b of the back side sheet member 2B are It is also referred to as a side main body 20b and a back extension 21b.

  The diaper 1 of the present embodiment will be described more specifically. As shown in FIG. 2, the absorbent main body 3 of the diaper 1 includes a liquid-permeable top sheet 31, a liquid-impermeable or water-repellent back sheet 32. , And a liquid-retaining absorbent 33 disposed between the sheets 31 and 32, and is formed in a rectangular shape that is long in the X direction. The absorbent body 33 is composed of an absorbent core made of an aggregate of fibers such as pulp fibers (may be a non-woven fabric) or an absorbent core in which water-absorbing polymer particles are held, and the absorbent core covered. A core wrap sheet (not shown). 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. Since the absorber 33 is easily bent at the low-rigidity portion 33d, both sides of the absorber 33 or the absorbent main body 3 are easily raised toward the wearer's skin when the diaper is worn.

  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 edges 2a, 2a along the diaper longitudinal direction (X direction); It has a pair of upper and lower end edges 2c, 2d (upper end edge 2c, lower end edge 2d) along the diaper width direction (Y direction). Similarly, the back seat member 2B has a horizontally long rectangular shape when the diaper 1 is unfolded and extended (see FIG. 2), and a pair of left and right side edges 2b and 2b along the X direction, and the diaper width. It has a pair of upper and lower end edges 2c, 2d (upper end edge 2c, lower end edge 2d) along the direction (Y direction). 2A and 2B, the length of the diaper longitudinal direction (X direction) is uniform in the diaper width direction (Y direction).

  Then, the side edge portion 2a of the ventral seat member 2A (specifically, a joint portion 2a ′ that is a part thereof) and the side edge portion 2b of the back side seat member 2B (specifically, a joint that is a part thereof). The pair of side seal portions 4, 4 described above is formed in the diaper 1 by joining the portion 2b ′). For this joining, known joining means such as a heat seal, a high frequency seal, an ultrasonic seal, and an 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 expansion and contraction part G3 is formed in the abdominal side extension part 21a and the back side extension part 21b.

  The waist stretchable part G1 is formed outward from the longitudinal ends 3a and 3b of the absorbent main body 3 in the longitudinal direction (X direction) of the diaper 1 in each of the abdominal sheet member 2A and the back sheet member 2B. Has been. The waistline elastic part G2 is formed between the waist elastic part G1 and the abdominal extension part 21a or the back extension part 21b in the X direction in each of the abdominal sheet member 2A and the back sheet member 2B. . The extension part stretchable part G3 is formed in the ventral side extension part 21a or the back side extension part 21b. The waist extension / contraction part G2 and the extension part extension / contraction part G3 are each formed in a part located outward from at least both side edges in the longitudinal direction of the absorbent main body 3 in the width direction (Y direction) of the diaper 1. Yes.

  In the diaper 1 shown in FIG.3 and FIG.4, the waist elastic part G1 is expressed so that the stretchability may be developed 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 waist part stretchable part G2 and the extension part stretchable part G3 express stretchability on the outer side of both side edges of the absorbent main body 3, and overlap with the absorbent main body 3, particularly the absorbent main body. The diaper 1 is formed in a state of being divided into right and left so as not to exhibit stretchability in a portion overlapping the central portion in the width direction 3.

  A plurality of elastic members 24 respectively extend along the diaper width direction on the abdominal body part 20a, the back body part 20b, the abdominal extension part 21a, and the back extension part 21b, and The diaper is arranged in an extended state with an interval in the longitudinal direction.

Moreover, as shown in FIG.2 and FIG.4, the back side main-body part 20b is divided into 3 area | regions B1-B3 by equally dividing the side seal part 4 into the article | item longitudinal direction (X direction), and a waist opening part. When the first region B1, the second region B2, and the third region B3 are sequentially formed from the closer side, the elastic member 24 extends along the diaper width direction in each of the first region to the third regions B1 to B3. It is arranged in an extended state. Thereby, each of 1st area | region-3rd area | region B1-B3 expresses the elasticity of a Y direction. In each of the first region to the third region B1 to B3, it is preferable that a plurality of elastic members 24 are arranged at intervals in the X direction.
Moreover, as shown in FIG.2 and FIG.4, the back side extension part 21b is equally divided into the longitudinal direction (X direction) of articles | goods, and it is divided into the back side extension part upper part B4 and the back side extension part lower part B5. When divided, the elastic member 24 is arranged in an extended state so as to extend along the diaper width direction in each of the back side extension part upper part B4 and the back side extension part lower part B5. Thereby, each of the back side extension part upper part B4 and the back side extension part lower part B5 expresses the elasticity of a Y direction. It is preferable that a plurality of elastic members 24 are arranged at intervals in the X direction on each of the back side extension part upper part B4 and the back side extension part lower part B5.

Moreover, as shown in FIG.2 and FIG.3, the side seal | sticker part 4 is equally divided into 3 area | regions A1-A3 by dividing the side seal part 4 into an article | item longitudinal direction (X direction) as shown in FIG.2 and FIG.3. When the first region A1, the second region A2, and the third region A3 are sequentially formed from the closer side, the elastic member 24 extends along the diaper width direction in each of the first region to the third regions A1 to A3. It is arranged in an extended state. Thereby, each of 1st area | region-3rd area | region A1-A3 expresses the elasticity of a Y direction. In each of the first region to the third regions A1 to A3, it is preferable that a plurality of elastic members 24 are arranged at intervals in the X direction.
In addition, the elastic member 24 is also arranged in an extended state so as to extend along the diaper width direction at the ventral side extension portion 21a of the ventral sheet member 2A. Thereby, the ventral extension part 21a also expresses elasticity in the Y direction.

In the present embodiment, the length L5 in the X direction of the ventral extension portion 21a is half the length L6 in the X direction of the back extension portion 21b, and the length of the upper portion B4 of the back extension portion B4. It is the same as the length L61 in the X direction. Therefore, the whole abdominal extension part 21a is part A4 corresponding to back side extension part upper part B4 in 2A of abdominal sheet members.
On the other hand, when the length L5 in the X direction of the ventral side extension part 21a is longer than the length L61 in the X direction of the back side extension part upper part B4, of the ventral side extension part 21a, The range from the main body 20a to the distance L61 is a portion A4 corresponding to the back extension part B4 in the abdominal sheet member 2A, and conversely, the length L5 in the X direction of the ventral extension part 21a. However, when it is shorter than the length L61 in the X direction of the back side extension part upper part B4, the area | region which has the length of L5 shorter than L61 is made into the part A4 corresponding to the back side extension part upper part B4. .

  It is preferable that a plurality of elastic members 24 are also arranged at intervals in the X direction at a portion A4 corresponding to the back side extension portion upper portion B4 of the ventral sheet member 2A. Hereinafter, the part A4 corresponding to the back side extension part upper part B4 in 2A of belly side sheet members is also called ventral side extension part upper part A4.

The diaper 1 has a dorsal extension part upper part B4, a dorsal extension part lower part B5 and an abdominal extension part upper part A4 each having elasticity in the diaper width direction (X direction). The upper part B4 and the abdominal extension part upper part A4 each have a contraction stress in the article width direction per unit length in the article longitudinal direction, and the same contraction stress in the back extension part lower part B5 (unit length in the article longitudinal direction). Larger than the shrinkage stress in the width direction of the article).
That is, the following expressions (2) and (3) are satisfied.
Shrinkage stress of the back side extension part upper part B4> Shrinkage stress of the back side extension part lower part B5 (2)
Shrinkage stress of ventral extension part upper part A4> Shrinkage stress of dorsal extension part lower part B5 (3)

When a strong contraction stress is imparted to the abdominal body portion 20a and the back body portion 20b, especially the third regions A3 and B3 on the abdomen and the back side, it is possible to prevent slipping off when wearing a diaper.
However, if only the ventral and dorsal third areas A3 and B3 are given a strong contraction stress that prevents slipping off, the areas will hit the skin strongly, with rubber marks, Burden.
On the other hand, the third region A3 is provided by giving the back side extension part upper part B4 and the corresponding ventral side extension part upper part A4 a certain degree of contraction stress stronger than the back side extension part lower part B5. , B3 can be suppressed, and the burden on the skin can be suppressed, and slippage can be prevented.

  Moreover, by giving the back side extension part lower part B5 a contraction stress weaker than that of the back side extension part upper part B4, the back side extension part lower part B5 is softly fitted to the lower part of the heel part having a large curvature, Protrusion of the buttocks is prevented, and an appearance with a sense of security against leakage is obtained. Further, inconveniences such as the back-side extension portion 21b turning over or the back-side extension portion 21b contracting strongly to deteriorate the appearance are prevented.

The contraction stress (contraction stress per unit length) of each part A1-A4, B1-B5 can be measured as follows. The same applies to the contraction stress of A31, A32, B31, B32 and the like which will be described later.
The side seal part of the diaper is peeled off, and extended and expanded as shown in FIG. 2 to expand it into a flat shape. For each of the abdominal sheet member 2A and the back sheet member 2B, areas A1 to A4 and B1 to B5 are respectively provided. Cut along a straight line parallel to the diaper width direction and cut out to obtain a strip or strip-shaped sample of each region having a length over the entire length between both side edges of both members 2A and 2B. At the time of cutting, not only the ventral sheet member 2A and the back sheet member 2B but also the entire diaper including the absorbent main body 3 and the like is cut, and the absorbent body is removed. After removing the absorbent body, the abdominal sheet member 2A and the back sheet member 2B may be cut into each region. When an elastic member is present at the boundary of the region, cutting is performed at a portion other than the adjacent elastic body. The both sides in the longitudinal direction of each cut out region (measurement sample) are sandwiched between chucks of a Tensilon tensile tester (“Autograph AG-X” manufactured by SHIMADZU), and the measurement sample is stretched at a speed of 300 mm / min. The inner dimensions of the abdominal sheet member 2A and the back sheet member 2B [the sheet of the outer packaging material is not contracted by the elastic member (in other words, the abdominal sheet member 2A and the back sheet without the elastic member being disposed) The length corresponding to 80 (for example, 280 mm) when the length between the side seal portions of the abdominal sheet member 2A and the back sheet member 2B measured in the state where only the member 2B is extended) is 100 (for example, 350 mm). The tensile load (cN) per unit length (10 mm) when contracted to a length equivalent to 71 (for example, 250 mm) is The contraction stress P in the Y direction per unit length is assumed.

The reason why the return force in a length equivalent to 71 when the inner dimensions of the abdominal sheet member 2A and the back sheet member 2B are defined as 100 is the main subject who wears the pants-type disposable diaper 1 of the present embodiment. This is because the length of the infant's belly is about 71% as compared with the inner diameter of the diaper. Note that the length of the abdomen around here is an average value of the abdomen measured in the standing position and the sitting position in consideration of the change in the circumference of the abdomen when the posture of the infant changes.
The contraction stress of the third region A3, B3 on the ventral side and the back side is measured by cutting out the entire third region, and the contraction stress of the lower half A32, B32 of the third region is the lower half A32 of the third region. , B32 is cut out and measured.

From the viewpoint of obtaining one or more of the effects described above, the contraction stress of the back extension part upper part B4 is 1.3 to 3.5 times the contraction stress of the back side extension part lower part B5, particularly 1.5 to It is preferably 3 times. From the same viewpoint, the contraction stress of the back extension part upper part B4 is preferably 14 to 35 cN, particularly 17 to 30 cN, and the contraction stress of the back extension part lower part B5 is 1 to 30 cN, particularly It is preferably 5 to 25 cN.
From the same viewpoint, the contraction stress of the ventral extension part upper part A4 is 1.3 to 3.5 times, particularly 1.5 to 3 times, the contraction stress of the dorsal extension part lower part B5. Preferably, the contraction stress of the ventral extension part upper part A4 is preferably 14 to 35 cN, and particularly preferably 17 to 30 cN.

Moreover, it is preferable that 1st-3rd area | region A1-A3 and B1-B3 satisfy | fill the relationship of following formula (1) about each of 2A of back side sheet members and 2B of back side sheet members.
Shrinkage stress in the second region> Shrinkage stress in the third region> Shrinkage stress in the first region (1)
That is, in the first to third regions A1 to A3 of the ventral sheet member 2A, the second region A2 has the largest contraction stress, the third region A3 has the second largest contraction stress, and the first region A1 has the contraction stress. It is preferable that the shrinkage stress of the second region B2 is the largest in the first to third regions B1 to B3 of the back seat member 2B, and the contraction stress of the third region B3 is the second largest, and the first region B1. It is preferable that the shrinkage stress is the smallest.

Further, the lower half portions A32 and B32 of the third regions of the abdominal sheet member 2A and the back sheet member 2B each have a contraction stress in the article width direction per unit length in the article longitudinal direction.
, B1 (the contraction stress in the article width direction per unit length in the article longitudinal direction) is larger than the contraction stress in the second regions A2 and B2 (the contraction stress in the article width direction per unit length in the article longitudinal direction). ) Is preferably smaller.
That is, the lower half A32 of the first region, the second region A1, A2 and the third region of the ventral sheet member 2A has the largest contraction stress in the second region A2, and the contraction stress in the lower half A32 of the third region. Is the next largest, and the shrinkage stress in the first region A1 is preferably the smallest, and the first and second regions B1, B2 and the lower half B32 of the third region of the back side seat member 2B are also in the second region B2. It is preferable that the contraction stress is the largest, the contraction stress of the lower half B32 of the third region is the next largest, and the contraction stress of the first region B1 is the smallest.

  While reducing the stress of 1st area | region A1, B1 distribute | arranged around a wearer's waist, lowering a waist opening part peripheral part by raising the stress of 2nd area | region A2, B2 which is easy to hit a wearer's iliac area | region It is possible to effectively prevent falling off and to reduce the sense of incongruity caused by the excretion of excrement from around the stomach and the area around the stomach of the infant coming out of the diaper. Further, by making the stress of at least the lower half portions A32 and B32 of the third regions A3 and B3 weaker than those of the second regions A2 and B2, these regions are strongly hit against the skin, with rubber marks, It is possible to prevent a burden on the user.

The iliac region is a region from the wearer's iliac crest to the upper anterior iliac spine. For example, the region from the iliac crest to the upper anterior iliac spine is described in JP-A-2006-61680. Has been.
In a state where the diaper 1 is worn, in order for the second regions A2 and B2 to come into contact with the site from the wearer's iliac crest to the upper anterior iliac spine, The distances k1 and k2 (see FIG. 2) between the center positions of the two regions A2 and B2 (center position in the longitudinal direction of the diaper 1) and the longitudinal center line CL of the diaper are 180 respectively. It is preferable that it is -230mm, More preferably, it is 185-220mm, More preferably, it is 195-215mm. In the case of adult diapers, the distances k1 and k2 (see FIG. 2) are preferably 300 to 350 mm, particularly 305 to 335 mm.

In each of the back side sheet member 2B and the abdominal side sheet member 2A, it is preferable that the contraction stress of the second regions B2 and A2 is larger than the contraction stress of the third regions B3 and A3. In other words, in each of the back sheet member 2B and the abdominal sheet member 2A, it is preferable that the contraction stress of the third regions B3 and A3 is smaller than the contraction stress of the second regions B2 and A2. The shrinkage stress in the second regions B2 and A2 is preferably 1.3 to 2.5 times, particularly 1.3 to 2 times that of the third regions B3 and A3.
Further, in each of the back side sheet member 2B and the abdominal side sheet member 2A, it is preferable that the contraction stress of the second region B2, A2 is larger than the contraction stress of the lower half portions B32, A32 of the third region. In other words, in each of the back seat member 2B and the ventral seat member 2A, it is preferable that the contraction stress of the lower half portions B32 and A32 of the third region is smaller than the contraction stress of the second regions B2 and A2. The contraction stress of the contraction stress in the second regions B2 and A2 is preferably 1.3 to 2.5 times, particularly 1.3 to 2 times, the contraction stress of the lower half portions B32 and A32 of the third region.

Further, in each of the back side seat member 2B and the abdominal side seat member 2A, the contraction stress in the third regions B3, A3 is greater than 1 time and less than 3.5 times the contraction stress in the first regions B1, A1. It is preferable that it is larger than 1 time and not larger than 3.0 times.
Further, in each of the back side sheet member 2B and the abdominal side sheet member 2A, the contraction stress of the lower half B32, A32 of the third region is 1.2 times to 3.5 times the contraction stress of the first region B1, A1. It is preferable that it is 2 times, especially 1.2 to 3.0 times.

Moreover, it is preferable that the contraction stress of 2nd area | region B2, A2 in each of the back | dorsal sheet | seat member 2B and the abdominal sheet | seat member 2A is 14-50 cN, especially 20-50 cN.
Moreover, it is preferable that the contraction stress of 3rd area | region B3, A3 in each of the back | dorsal sheet | seat member 2B and the abdominal sheet | seat member 2A is 14-35 cN, especially 17-35 cN.
Moreover, it is preferable that the contraction stress of 1st area | region B1, A1 in each of the back | dorsal sheet | seat member 2B and the abdominal sheet | seat member 2A is 1-30 cN, especially 5-25 cN.

While preventing the third regions A3 and B3, particularly the lower half portions A32 and B32 thereof, from coming into contact with the skin, the third regions A3 and B3 and the above-described dorsal extension part upper part B4 and ventral extension part upper part A4. From the viewpoint of preventing deviation due to the contraction force, the back side extension portion upper part B4 is preferably lower than the contraction stress of the second region B2 of the back side sheet member 2B. Further, from the same viewpoint, it is preferable that the ventral extension portion upper portion A4 is lower than the contraction stress of the second region A2 of the ventral sheet member 2A. It is more preferable that both the back extension part upper part B4 and the abdominal extension part upper part A4 satisfy such conditions.
In the third regions A3 and B3, at least one elastic member 24 is arranged in each of the upper half portions A31 and B31 and the lower half portions A32 and B32. In particular, the elastic members 24 are spaced apart in the X direction. It is preferable that a plurality of them are arranged.

The upper part B4 of the back side extension part and the lower half B32 of the third region B3 of the back side seat member 2B are located near the crotch part of the diaper where urination has been performed and the weight has been increased. As a result, it can be said that the rubber marks are easily attached.
Therefore, by making the contraction stress of the back extension part B4 and the contraction stress of the lower half part B32 of the third region B3 of the back sheet member 2B equal, the upper part of the back extension part during urination Since the pressure applied to B4 and the lower half B32 of the third region B3 of the back seat member 2B is evenly distributed and the pressure does not concentrate on any part, the rubber mark while preventing slippage Can be effectively reduced, which is preferable.
From the same viewpoint, it is preferable that the contraction stress of the upper part A4 of the ventral side extension part and the contraction stress of the lower half part A32 of the third region A3 of the ventral sheet member 2A be equal.

The contraction stress of the lower half B32 of the third region B3 of the back sheet member 2B is 0.3 to 2.5 times, particularly 0.5 to 2 times the contraction stress of the back extension part B4. Is preferred. The case where this magnification is 0.8 to 1.2 times is said to be equivalent.
Moreover, it is preferable that the contraction stress of 2nd area | region B2 of the back side sheet | seat member 2B is 1.3 to 2.5 times, especially 1.3 to 2 times the contraction stress of the back side extension part upper part B4.
The contraction stress of the lower half B32 of the third region B3 of the back seat member 2B is preferably 14 to 35 cN, and particularly preferably 17 to 35 cN.
While the contraction stress of the upper half B31 of the third region B3 of the back sheet member 2B is the same as the contraction stress of the lower half B32 or smaller than the contraction stress of the lower half B32, while preventing slipping off, It is preferable from the viewpoint of further improving the ease of elongation of the diaper and further reducing rubber marks.
However, it is preferable that the contraction stress in the third region B3 is larger than the contraction stress in the first region B1 from the viewpoint of preventing the slippage.

The contraction stress of the lower half A32 of the third region A3 of the ventral sheet member 2A is 0.3 to 2.5 times, particularly 0.5 to 2.0 times the contraction stress of the ventral extension part upper part A4. Preferably there is. The case where this magnification is 0.8 to 1.2 times is said to be equivalent.
Further, the contraction stress of the second region A2 of the ventral sheet member 2A is preferably 1.3 to 2.5 times, particularly 1.3 to 2 times, the contraction stress of the ventral extension part upper part A4.
The contraction stress of the lower half A32 of the third region A3 of the ventral sheet member 2A is preferably 14 to 35 cN, particularly 17 to 35 cN.
The contraction stress of the upper half A31 of the third region A3 of the ventral sheet member 2A is the same as the contraction stress of the lower half A32 or smaller than the contraction stress of the lower half A32. It is preferable from the viewpoint of further improving the ease of elongation of the diaper and further reducing rubber marks.
However, it is preferable that the contraction stress in the third region A3 is larger than the contraction stress in the first region A1 from the viewpoint of preventing the slippage.

  The method for differentiating the contraction stress between one region and the other region of the ventral sheet member 2A and the back sheet member 2B is not particularly limited as long as the contraction stress can be varied. For example, (1) A method in which the elongation rate of the elastic member is different between the region where the shrinkage stress is high and the region where the shrinkage stress is low, and (2) the region where the shrinkage stress is high and the region where the shrinkage stress is low. , A method of varying the thickness of the elastic member to be disposed, (3) a method of varying the material of the elastic member to be disposed in a region having a high shrinkage stress and a region having a low shrinkage stress, and (4) a region having a high shrinkage stress. Examples thereof include a method in which the arrangement pitch of the elastic members is made different in the region where the shrinkage stress is low, and (5) a method in which two or more of these are combined.

The diaper 1 of this embodiment has a waist stretchable part G1 and a waistline stretchable part G2 on the main body parts 20a and 20b of the abdominal sheet member 2A and the back sheet member 2B. In addition, each of the extending portions 21a and 21b of the abdominal sheet member 2A and the back sheet member 2B has an extending portion extendable portion G3.
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, between the outer layer sheet | seat 22 and the inner layer sheet | seat 23, many fusion | fusion parts (joining) formed in the shape of a dotted line Part) 26, and the elastic member 24 is arranged so as not to pass through the fusion part 26.

More specifically, the stretchable portions G1 to G3 include a joint row in which joint portions 26 are intermittently arranged in series in the longitudinal direction (X direction) of the diaper 1, and the width direction (Y direction) of the diaper 1. A plurality of rows are formed, and the X direction of each joint portion in the joint row is the same.
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. is 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. is 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 stretchable part G2 and the extended part stretchable part G3 includes the side adhesive region 27 and the absorbent main body side adhesive 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 extension stretchable part G3 of each of the abdominal sheet member 2A and the back sheet member 2B, the elastic member 24 contracts, thereby causing the sheets 22 between adjacent joint rows. And 23 are deformed so as to bulge outward, and a sheet 29 or a ridge 29 composed of the sheet 23 is generated between adjacent joint rows, and between the two sheets 22 and 23, a ridge 29 and a ridge 29 are surrounded. Is formed (see FIG. 7). By forming the heel 29 and the hollow portion 30, the softness of the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B is improved to improve the touch and the like, and between the heel 29 formed on the skin contact surface side Air is easy to circulate and has excellent anti-sag properties. In particular, when the inner layer sheet 23 is formed of a breathable sheet such as a nonwoven fabric, moisture in the diaper 1 is more easily released to the outside.

On the other hand, in the diaper 1 of the present embodiment, as shown in FIGS. 3 and 4, the boundaries between the main body portions 20a and 20b and the extension portions 21a and 21b in the abdominal sheet member 2A and the back sheet member 2B, respectively. The region has a portion where the width (the length in the Y direction) of the side adhesion region 27 is wider than other portions.
More specifically, with respect to the back sheet member 2B, the width W1 of the side adhesion area 27 in the third area B3 and the back extension part upper part B4 is the first area B1, the second area B2, and the back extension. For the ventral sheet member 2A, the width W1 of the side adhesive region 27 in the third region A3 and the ventral extension part upper part A4 is wider than the width W2 of the side adhesive region 27 in the lower part B5. It is wider than the width W2 of the side adhesion region 27 in the first region A1 and the second region A2.

  In the vicinity of the lower end of the side seal portion 4, as described above, stress tends to be high particularly during urination, and rubber marks are likely to be attached to the skin due to the relationship with the curvature of the wearer's skin. In the boundary area between the main body parts 20a, 20b and the extension parts 21a, 21b, particularly the third area B3 and the back extension part upper part B4 of the back side seat member, and / or the corresponding area of the ventral side seat member, By providing a part with a large width of the part adhesion region 27, the part is maintained more smoothly than the part on which the ridges 29 are formed, and the contact area with the skin increases, so the pressure on the skin by the elastic member is increased. It is possible to disperse and improve the slip-off preventing property while preventing the rubber marks from sticking to the skin. The total width of the left and right W2 when the diaper is expanded is preferably 10 to 65%, particularly preferably 15 to 60%, of the width of the abdomen (or back side) sheet member when the diaper is expanded. Further, the width of W2 is preferably 1.2 to 10 times that of W1, and particularly preferably 4 to 7.5 times in order to obtain the above-described effects.

  The length L5 (see FIG. 2) of the ventral extension 21a is preferably 5 to 60%, particularly 20 to 40% of the length La (see FIG. 2) of the ventral sheet member 2A. The length L6 (see FIG. 2) of the extending portion 21b is preferably 5 to 60%, particularly 20 to 40%, of the length Lb (see FIG. 2) of the back seat member 2B. Moreover, in the case of the diaper for infants, it is preferable that length L5, L6 of each of the abdominal side and back side extension parts 21a and 21b is 10-150 mm, More preferably, it is 20-100 mm. In the case of an adult diaper, the lengths L5 and L6 of the abdominal and dorsal extending portions 21a and 21b are preferably 10 to 200 mm, and more preferably 20 to 150.

Further, the length L6 of the dorsal extension portion 21b is longer than the length L5 of the ventral extension portion 21a (L6> L5), and it is between the ventral extension portion 21a and the dorsal extension portion 21b. This gap is preferable from the viewpoint of not giving an impression such as that caused by peeling of the side seal portion or tearing of the sheet. However, the length L6 of the dorsal extension portion 21b is 1.2 to 10 times, particularly 1.5 to 6.5 times the length L5 of the ventral extension portion 21a. From the viewpoint of property and appearance.
The lengths L5 and L6 of the ventral extension part 21a and the dorsal extension part 21b are both the length in the diaper longitudinal direction (X direction).

  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 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.

  The above-described diaper 1 is intermittent, for example, so as to bridge the absorbent main body 3 between the belt-shaped original fabric of the abdomen-side sheet member 2A and the belt-shaped original fabric of the back-side sheet member 2B while separating them. Then, after folding in half so that the belt-like original fabric of the abdominal sheet member 2A and the belt-like original fabric of the back-side sheet member 2B overlap each other, heat sealing or the like for forming the side seal portion 4 (joint ), And at the same time as or after the joining, it is cut and divided into individual disposable diapers. According to this method, it is unnecessary to remove the trim from the raw material of the outer packaging material or to reduce the size of the trim to be removed, as compared with the case where the through hole or notch for forming the leg opening is formed. Can be planned. In particular, the strips of the abdominal sheet member 2A and the back sheet member 2B cut by a straight line perpendicular to the flow direction are the abdomen sheet member 2A and the back sheet member 2B of the completed diaper 1. This is preferable because trim removal is unnecessary.

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, 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.

  In addition, the length L5 in the X direction of the ventral extension portion 21a may be longer than the length L61 in the X direction of the upper portion B4 of the back side extension portion. An elastic member is disposed in a portion (a portion corresponding to the back side extension portion lower part B5) that extends downward than a portion corresponding to the side extension portion upper part B4 (abdominal side extension portion upper part A4). May not be arranged. Moreover, when the said part has the elasticity of a Y direction, the contraction stress may be larger or smaller than ventral extension part upper part A4, but it is equivalent to ventral extension part upper part A4. Or smaller.

  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 rectangular ventral sheet member disposed on the wearer's ventral side, a rectangular dorsal sheet member disposed on the wearer's dorsal side, and the ventral sheet member and the dorsal sheet member. A pants-type absorbent article having a waist opening and a pair of leg openings,
Each of the abdominal side seat member and the back side seat member includes a main body portion having side seal portions on both the left and right sides, and an extending portion extending from the main body portion to the crotch portion side and having no side seal portions on the left and right sides. Have
When the extension part of the back side sheet member is divided into two equal parts in the longitudinal direction of the article and divided into an upper part of the back side extension part and a lower part of the back side extension part,
The body part and the extension part of the abdominal seat member, and the body part, the back extension part upper part and the back side extension part lower part of the back seat member are all stretchable in the article width direction. Have
The parts corresponding to the upper part of the back side extension part and the upper part of the back side extension part of the abdominal sheet member have shrinkage stress in the article width direction per unit length in the article longitudinal direction, respectively. A pants-type absorbent article that is larger than the same shrinkage stress at the bottom of the protrusion.

<2> When the main body portion is divided into three regions by equally dividing the side seal portion in the longitudinal direction of the article, and the first region, the second region, and the third region are sequentially arranged from the side closer to the waist opening. In addition,
In the lower half of the third region of each of the ventral sheet member and the back sheet member, the contraction stress in the article width direction per unit length in the article longitudinal direction is larger than the contraction stress in the first region. The pants-type absorbent article according to <1>, which is smaller than the shrinkage stress.
<3> The main body is divided into three regions that divide the longitudinal direction of the side seal portion into three equal parts, and when the first region, the second region, and the third region are sequentially formed from the side closer to the waist opening,
The part corresponding to the upper part of the back side extension part and / or the upper part of the back side extension part of the abdominal sheet member has a shrinkage stress in the article width direction per unit length in the article longitudinal direction, The underpants type absorbent article according to <1> or <2>, which is lower than the contraction stress of the second region in the member and / or the ventral sheet member.
<4> The main body is divided into three regions that divide the longitudinal direction of the side seal portion into three equal parts, and when the first region, the second region, and the third region are sequentially formed from the side closer to the waist opening,
The part corresponding to the upper part of the back side extension part and / or the upper part of the back side extension part of the abdominal sheet member has a shrinkage stress in the article width direction per unit length in the article longitudinal direction, The pants-type absorbent article according to any one of <1> to <3>, which is equivalent to the contraction stress of the lower half of the third region in the member and / or the ventral sheet member.

<5> The contraction stress of the lower half B32 of the third region B3 of the back seat member 2B is 0.8 to 1.2 times the contraction stress of the back extension B4. <4> Pants-type absorbent article.
<6> The contraction stress of the lower half A32 of the third region A3 of the ventral sheet member 2A is 0.8 to 1.2 times the contraction stress of the upper part A4 of the ventral extension part <4> or <5> The underpants-type absorbent article described.
<7> The length of the extension part of the back side sheet member is longer than the length of the extension part of the abdominal side sheet member, The pants type absorptivity according to any one of <1> to <6> Goods.
<8> An elastic member that is joined to the body portion and the extension portion of each of the abdomen-side sheet member and the back-side sheet member at a number of joining portions formed in a dotted shape between two sheets. The pants-type absorbent article according to any one of <1> to <7>, wherein each has a stretchable part that is arranged so as to pass between joint parts adjacent to each other in the longitudinal direction of the article.
<9> At the both side edges of the ventral sheet member and the back sheet member or in the vicinity thereof, there is an adhesive region where the two sheets are joined with an adhesive, and the main body part and the extension The pants-type absorbent article according to any one of <1> to <8>, wherein a width of the adhesive region is wider than other portions in a boundary region with the portion.

<10> In each of the abdominal sheet member 2A and the back sheet member 2B, the waist stretchable part extends outward from the longitudinal ends 3a, 3b of the absorbent main body 3 in the longitudinal direction (X direction) of the diaper 1. The underpants-type absorbent article according to any one of <1> to <9>, in which G1 is formed.
<11> Between the waist elastic part G1 and the abdominal extension part 21a or the back extension part 21b in the longitudinal direction (X direction) of the diaper 1 in each of the abdominal sheet member 2A and the back sheet member 2B. The pants-type absorbent article according to <10>, wherein a waistline stretchable part G2 is formed.
<12> The waistline stretchable part G2 is formed at least in the width direction (Y direction) of the pant-type absorbent article at a portion located outward from both side edges in the longitudinal direction of the absorbent main body 3 < The underpants-type absorbent article according to any one of 1> to <11>.
<13> An extension part stretchable part is formed in the extension part of the ventral sheet member and / or the back sheet member, and the extension part stretchable part is formed in the width direction of the pant-type absorbent article (Y direction). ), The pants-type absorbent article according to any one of <1> to <12>, which is formed at least at portions located outward from both side edges in the longitudinal direction of the absorbent main body 3.
<14> The waist stretchable part G1 is formed to exhibit stretchability across the entire area between the side adhesive regions 27 and 27 in the abdominal sheet member 2A or the back sheet member 2B. Pants-type absorbent article.
<15> The waist extension / contraction part G2 and the extension part extension / contraction part G3 express elasticity at the outer side of both side edges of the absorbent main body 3, and overlap with the absorbent main body 3, in particular, the width direction of the absorbent main body 3 The pants type according to any one of <10> to <14>, wherein the pants type absorbent article (diaper 1) is divided into left and right parts so as not to exhibit stretchability in a portion overlapping with the central part. Absorbent article.
<16> A plurality of elastic members 24 respectively extend along the diaper width direction in the abdominal body part 20a, the back body part 20b, the abdominal extension part 21a, and the back extension part 21b. Furthermore, the underpants type absorbent article according to any one of <1> to <15>, which is arranged in an extended state with a gap in the longitudinal direction of the diaper.
<17> The pant according to any one of <1> to <16>, wherein a length L5 in the X direction of the ventral extension portion 21a is the same as a length L61 in the X direction of the back extension portion B4. Mold absorbent article.
<18> The pant type according to any one of <1> to <16>, wherein the length L5 in the X direction of the ventral extension portion 21a is longer than the length L61 in the X direction of the back side extension portion upper portion B4. Absorbent article.
<19> The length L5 in the X direction of the ventral extension part 21a is shorter than the length L61 in the X direction of the back side extension part upper part B4. The pants type according to any one of <1> to <16> Absorbent article.

The shrinkage stress of the <20> back extension part upper part B4 is 1.3 to 3.5 times, especially 1.5 to 3 times the contraction stress of the back side extension part lower part B5. <1> to <19 > The pants-type absorbent article according to any one of the above.
<21> The pants-type absorbent article according to any one of <1> to <20>, wherein the shrinkage stress of the back-side extension part B4 is 14 to 35 cN, particularly 17 to 30 cN.
<22> The pants-type absorbent article according to any one of <1> to <21>, wherein the contraction stress of the back-side extension part lower part B5 is 1 to 30 cN, particularly 5 to 25 cN.
<23> The contraction stress of the abdominal extension part upper part A4 is 1.3 to 3.5 times, particularly 1.5 to 3 times the contraction stress of the dorsal extension part lower part B5. <1> to <22 > The pants-type absorbent article according to any one of the above.
<24> The pants-type absorbent article according to any one of <1> to <23>, wherein the contraction stress of the ventral extension part upper part A4 is 14 to 35 cN, particularly 17 to 30 cN.
<25> The pant-type absorbent article according to any one of <1> to <24>, in which the first to third regions A1 to A3 of the ventral sheet member 2A have the largest shrinkage stress in the second region A2.
<26> The main body portion is divided into three regions that divide the longitudinal direction of the side seal portion into three equal parts, and are defined as a first region, a second region A2, B2, and a third region in order from the side close to the waist opening. When the pants-type absorbent article (diaper 1) is worn, the second regions A2 and B2 come into contact with the site from the wearer's iliac crest to the superior anterior iliac spine <1> to <25>. The underpants type absorbent article according to any one of the above.
<27> The main body is divided into three regions that divide the longitudinal direction of the side seal portion into three equal parts, and when the first region, the second region, and the third region are sequentially formed from the side closer to the waist opening, In each of the back side sheet member 2B and the abdominal side sheet member 2A, the contraction stress of the second regions B2 and A2 is 1.3 to 2.5 times the contraction stress of the third regions B3 and A3, particularly 1.3 to The underpants-type absorbent article according to any one of <1> to <26>, which is doubled.
<28> The main body is divided into three regions that divide the longitudinal direction of the side seal portion into three equal parts, and when the first region, the second region, and the third region are sequentially formed from the side closer to the waist opening, In each of the back sheet member 2B and the ventral sheet member 2A, the contraction stress of the second region B2, A2 is 1.3 to 2.5 times the contraction stress of the lower half B32, A32 of the third region, particularly The underpants-type absorbent article according to any one of <1> to <27>, which is 1.3 to 2 times.
<29> When the main body portion is divided into three regions that divide the longitudinal direction of the side seal portion into three equal parts, when the first region, the second region, and the third region are sequentially formed from the side closer to the waist opening, In each of the back sheet member 2B and the ventral sheet member 2A, the contraction stress of the lower half B32, A32 of the third region is 1.2 to 3.5 times the contraction stress of the first region B1, A1, The pants-type absorbent article according to any one of <1> to <28>, which is particularly 1.2 to 3.0 times.
<30> The ventral sheet member and the dorsal sheet member have side adhesion regions in which elastic members are fixed between the sheets via an adhesive at the respective side edges or in the vicinity thereof. In each of the ventral sheet member 2A and the back sheet member 2B, the width of the side adhesive region 27 (the length in the Y direction) is another portion in the boundary region between the main body portions 20a and 20b and the extending portions 21a and 21b. The underpants-type absorbent article according to any one of <1> to <29>, which has a wider portion.
<31> The back-side sheet member has side adhesion regions in which elastic members are fixed between the sheets via an adhesive at each side edge or in the vicinity thereof. The width W1 of the side adhesion region 27 in the side extension part upper part B4 is wider than the width W2 of the side part adhesion area 27 in the first area B1, the second area B2 and the back side extension part lower part B5 <1. >-<30> The underpants type absorbent article in any one of.
<32> The abdominal sheet member has side adhesion regions in which elastic members are fixed between the sheets via an adhesive at each side edge or in the vicinity thereof, and the third region A3 and the abdomen Any of <1> to <31>, wherein the width W1 of the side adhesion region 27 in the side extension portion upper part A4 is wider than the width W2 of the side adhesion region 27 in the first area A1 and the second area A2. The pants-type absorbent article described in 1.
<33> The pants-type absorbent article according to any one of <1> to <32>, wherein the pants-type absorbent article is a pants-type disposable diaper for infants.

  Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited by the following.

[Examples 1 and 2 and Comparative Examples 1 and 2]
The elastic member shown in Table 1 is arranged in the aspect shown in Table 1 in the abdominal sheet member and the back sheet member, and each part has the contraction stress shown in Table 1. The pants type disposable diaper of the form shown in FIGS. Manufactured. As the elastic members, spandex thread-like elastic bodies were used.
In Table 1, “↑” indicates the same as above. Further, in the diaper of Example 1, the length L5 in the X direction of the ventral extension portion 21a is 1/2 the length L6 in the X direction of the back extension portion 21b (the dorsal extension portion). The length of the upper part B4 is the same as the length L61 in the X direction). The same applies to Comparative Examples 1 and 2. The contraction stress of each part is a contraction stress per unit length (10 mm) in the diaper longitudinal direction.

[Evaluation]
About the obtained underpants type disposable diaper, (1) difficulty in slipping and (2) difficulty in attaching rubber marks around the foot were evaluated by the following methods.

(1) Slip-off difficulty The diapers of Examples 1 and 2 and Comparative Examples 1 and 2 are attached to a baby dynamic model equivalent to a 1 to 2 year-old child, and 240 g (assumed when awakening) is injected, The amount of slippage around the foot after operating for 30 minutes was compared. The amount of slipping around the foot was measured as the amount of slipping around the foot from the intersection of the sock and the ear line (socket side point) to the bottom of the diaper side seal.
(Evaluation criteria)
○: The amount of slip around the foot is less than 15 mm. Δ: The amount of slip around the foot is less than 15 mm and less than 25 mm.

(2) Difficulty of sticking rubber marks around the feet The diapers of Examples 1 and 2 and Comparative Examples 1 and 2 were worn by a 1-2 year old child for 4-10 hours (usually used). The state was observed.
(Evaluation criteria)
◎: Level at which rubber marks are hardly visible ○: Level at which rubber marks are not noticeable ×: Level at which rubber marks are clearly attached

  From the results shown in Table 2, the shrinkage stress of the back extension part B4 and the contraction stress of the corresponding part of the ventral seat member (ventilation extension part A4) are determined from the contraction stress of the back extension part lower part. By making it higher, it is possible to improve the fit to the curved buttocks, and effectively prevent the diaper from shifting without excessively increasing the stress in the third region where rubber marks are likely to be attached, and It can be seen that rubber marks around the waistline can be prevented.

  Further, from the comparison of the results of Example 1 and Example 2, by making the stress at the upper part of the extension portion equal to the contraction stress at the lower half of the third region, the contraction stress at the third region where rubber marks are easily attached. It can be seen that diaper displacement can be effectively prevented and rubber marks can also be prevented without excessively increasing the thickness.

1 Pants-type disposable diapers (pants-type absorbent articles)
2A Ventral sheet member 2a, 2a Side edge 20a Ventral body part A1 1st area A2 2nd area A3 3rd area A32 Lower half part 21a of 3rd area 21a Ventral extension part A4 Abdominal extension part upper part ( The part corresponding to the upper part of the dorsal extension in the ventral seat member)
2B Back side seat member 2b, 2b Side edge 20b Back side main body B1 1st area B2 2nd area B3 3rd area B32 Lower half of 3rd area 21b Back side extension part B4 Back side extension part upper part B5 Lower part of back side extension part 22 Outer layer sheet 23 Inner layer sheet 24 Elastic member 29 襞 3 Absorbent main body 31 Top sheet 32 Back sheet 33 Absorber 34 Side cuff 4 Side seal part 5 Waist opening part 6 Opening part A Abdominal side part B Back side C Inseam G1 Waist stretchable part G2 Girth stretchable part G3 Extension stretchable part

Claims (7)

A rectangular ventral sheet member disposed on the wearer's ventral side, a rectangular dorsal sheet member disposed on the wearer's dorsal side, and spanned and fixed to the ventral sheet member and the dorsal sheet member A pants-type absorbent article having a waist opening and a pair of leg openings,
Each of the abdominal side seat member and the back side seat member includes a main body portion having side seal portions on both the left and right sides, and an extending portion extending from the main body portion to the crotch portion side and having no side seal portions on the left and right sides. Have
When the extension part of the back side sheet member is divided into two equal parts in the longitudinal direction of the article and divided into an upper part of the back side extension part and a lower part of the back side extension part,
The body part and the extension part of the abdominal seat member, and the body part, the back extension part upper part and the back side extension part lower part of the back seat member are all stretchable in the article width direction. Have
The parts corresponding to the upper part of the back side extension part and the upper part of the back side extension part of the abdominal sheet member have shrinkage stress in the article width direction per unit length in the article longitudinal direction, respectively. A pants-type absorbent article that is larger than the same shrinkage stress at the bottom of the protrusion. When the main body portion is divided into three regions by equally dividing the side seal portion in the longitudinal direction of the article, and when the first region, the second region, and the third region are sequentially formed from the side closer to the waist opening,
In the lower half of the third region of each of the ventral sheet member and the back sheet member, the contraction stress in the article width direction per unit length in the article longitudinal direction is larger than the contraction stress in the first region. The underpants-type absorbent article according to claim 1, which is smaller than the shrinkage stress. When the main body is divided into three regions that divide the longitudinal direction of the side seal portion into three equal parts, when the first region, the second region, and the third region are sequentially formed from the side close to the waist opening,
The part corresponding to the upper part of the back side extension part and / or the upper part of the back side extension part of the abdominal sheet member has a shrinkage stress in the article width direction per unit length in the article longitudinal direction, The underpants type absorbent article of Claim 1 or 2 lower than the contraction stress of the said 2nd area | region in a member and / or the said stomach side sheet member. When the main body is divided into three regions that divide the longitudinal direction of the side seal portion into three equal parts, when the first region, the second region, and the third region are sequentially formed from the side close to the waist opening,
The part corresponding to the upper part of the back side extension part and / or the upper part of the back side extension part of the abdominal sheet member has a shrinkage stress in the article width direction per unit length in the article longitudinal direction, The underpants type absorbent article according to any one of claims 1 to 3, which is equivalent to a contraction stress of a lower half portion of the third region in the member and / or the ventral sheet member.   The pants-type absorbent article according to any one of claims 1 to 4, wherein a length of the extension part of the back side sheet member is longer than a length of the extension part of the abdominal sheet member.   Elastic members are joined to the body part and the extension part of the abdomen-side sheet member and the back-side sheet member, respectively, with a plurality of joints formed between the two sheets in the form of dots. The pants-type absorbent article according to any one of claims 1 to 5, further comprising an expansion / contraction part arranged so as to pass between adjacent joint parts in the article longitudinal direction.   It has an adhesion region where the two sheets are joined with an adhesive at both side edges or the vicinity thereof of each of the abdominal sheet member and the back sheet member, and the body part and the extension part The pants-type absorbent article according to any one of claims 1 to 6, wherein the boundary region has a portion where the width of the adhesive region is wider than other portions.

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