JP2012135519A - Underpants type absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type absorbent article which is excellent in preventing moving and falling down, scarcely applies a pressure mark on an elastic member, and scarcely applies a burden on the skin.SOLUTION: When shrinking stresses in the article width direction per unit length in the article longitudinal direction of first-third regions A1-A3 and an abdomen side extension part A4 in an abdomen side sheet member 2A are expressed as P-P, shrinking stresses per elastic member in the article width direction are expressed as Q-Q, and shrinking stresses related to first-third regions B1-B3 and a backside corresponding part B4 in a backside sheet member 2B are expressed as P-Pand Q-Q, a diaper 1 satisfies following equations: Ratio (P/P)>ratio (Q/Q), ratio (P/P)>1...(1), ratio (P/P)>ratio (Q/Q), ratio (P/P)>1...(2), ratio (P/P)>ratio (Q/Q), ratio (P/P)>1...(3), and ratio (P/P)>ratio (Q/Q), ratio (P/P)>1....(4).

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, the conventional pants-type absorbent article in which the outer packaging material is divided into the abdominal sheet member and the back sheet member has a problem that slippage tends to occur during wearing. 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 order to solve this problem, the present inventors have examined the shrinkage stress in the article width direction of each of the back side sheet member and the abdomen side sheet member in the vicinity of the lower end portion (end portion on the crotch side) of the side seal portion. In particular, it has been found that diaper slip-off can be effectively prevented if the area is increased in particular, but if the region has only a strong shrinkage stress sufficient to prevent the slip-off, There were problems that hit the skin strongly, left rubber marks, and placed a burden on the skin.

  Accordingly, the present invention is a pants-type absorbent article in which the outer packaging material is divided into the abdominal sheet member and the back sheet member, while being excellent in slip-off prevention, and the pressing mark of the elastic member is not easily attached to the skin. The present invention relates to a pants-type absorbent article with a low burden on the skin.

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 pant-type absorbent article having an absorbent main body that is bridged and fixed, and having a waist opening and a pair of leg openings, wherein the ventral seat member and the back seat member are side seals on the left and right sides. A ventral side and a dorsal side main body portion having a portion, and a ventral side and a dorsal side extending portion extending from the abdominal side and the dorsal side main body portion to the crotch part side and having no side seal portions on both the left and right sides. The back extension part has the same or longer length in the longitudinal direction of the article as the abdominal extension part, and the abdominal body part, the abdominal extension part, the back side body part, and the back side extension part. The back side corresponding part corresponding to the abdominal side extension part of the part is the article width direction by an elastic member arranged in the article width direction. It has elasticity, the ventral body part is divided into three regions by dividing the side seal part into three parts in the longitudinal direction of the article, the first region A1, the second region in order from the side close to the waist opening and A2 and the third region A3, the first to third regions A1~A3 and ventral extending portion A4 in the ventral sheet member, the article width direction per unit length of the article longitudinal shrinkage stress P _A1 ~ P _A4 , the contraction stress in the article width direction per elastic member is Q _{A1 to} Q _A4, and the back body part is divided into three regions by dividing the side seal part into three parts in the article longitudinal direction. The first region B1, the second region B2, and the third region B3 in order from the side close to the waist opening, and the article longitudinal direction of the first to third regions B1 to B3 and the back side corresponding portion B4 in the back side seat member The shrinkage stress in the article width direction per unit length of P _{B1 to} P _B4 , the elastic member The present invention provides a pant-type absorbent article that satisfies the following relational expressions (1) to (4) when the shrinkage stress in the article width direction per one is Q _{B1 to} Q _B4 .
Ratio (P _A3 / P _A1 )> ratio (Q _A3 / Q _A1 ), ratio (P _A3 / P _A1 )> 1 (1)
Ratio (P _B3 / P _B1 )> ratio (Q _B3 / Q _B1 ), ratio (P _B3 / P _B1 )> 1 (2)
Ratio (P _A4 / P _A1 )> ratio (Q _A4 / Q _A1 ), ratio (P _A4 / P _A1 )> 1 (3)
Ratio (P _B4 / P _B1 )> ratio (Q _B4 / Q _B1 ), ratio (P _B4 / P _B1 )> 1 (4)

  The pants-type absorbent article of the present invention is a pants-type absorbent article in which the outer packaging material is divided into a ventral sheet member and a dorsal sheet member. It is hard to stick to and has little burden on the skin.

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 referred to as diaper 1) according to an embodiment of the present invention is a rectangular abdominal sheet member 2A disposed on the abdomen side of a wearer as shown in FIGS. And a rectangular dorsal sheet member 2B disposed on the back side of the wearer, and an absorptive main body 3 fixed over the ventral sheet member 2A and the dorsal sheet member 2B. The side edge portions 2a, 2a of the seat member 2A and the side edge portions 2b, 2b of the back side seat member 2B are joined together 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. Extension portions 4A and 21b that do not have the seal portions 4 and 4 are formed.
Hereinafter, the body part 20a and the extension part 4A of the abdominal sheet member 2A are also referred to as the abdomen body part 20a and the abdomen extension part 4A, 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 ventral extension part 4A and the back 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 4A 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 on the ventral side extension part 4A 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 ventral main body 20a, the back main body 20b, the ventral extension 4A, and the back extension 21b, and The diaper is arranged in an extended state with an interval in the longitudinal direction.

In the present embodiment, the length L6 in the X direction of the dorsal extension portion 21b is longer than the length L5 in the X direction of the ventral extension portion 4A. Therefore, the back side extension part 21b has a back side corresponding part B4 corresponding to the abdominal side extension part 4A, and an extension part lower part B5 extending further to the crotch part C side than the back side corresponding part B4. Yes.
The back side corresponding part B4 is located on the crotch C side from the back side main body part 20b in the back side extension part 21b, the distance from the back side main body part 20b is zero or more, and the ventral side extension part 4A. In the X direction length L5 or less.
On the other hand, when the length L5 in the X direction of the ventral side extension 4A is the same as the length L6 in the X direction of the back side extension 21b, the entire back side extension 21b is The back side corresponding part B4.

And as shown in FIG.2 and FIG.3, the side seal | sticker part 4 is equally divided into 3 area | region A1-A3, and the waist part is divided into 3 area | regions A1-A3. 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 addition, the elastic member 24 is also arranged in an extended state so as to extend along the diaper width direction in the ventral side extension portion 4A of the ventral sheet member 2A. As a result, the ventral side extension 4A also develops stretchability in the Y direction.

In each of the first to third regions A1 to A3 and the ventral side extension 4A (A4) in the ventral sheet member 2A, a plurality of elastic members 24 are arranged at intervals in the X direction. It is preferable. The number of elastic members arranged at intervals in the X direction is 2 for each of the regions A1 to A3 when the widths of the first region to the third regions A1 to A3 are about 40 mm. It is preferably within the range of -80, more preferably within the range of 2-20, and the range of 2-80 for the ventral third region A3 and the ventral extension 4A (A4). The inside is preferable, and the range of 2 to 20 is more preferable.
The numerical range related to the number of elastic members arranged on the ventral sheet member 2A varies based on the widths of the regions A1 to A3. When the width of each area A1 to A3 is larger (or smaller) than 40 mm, the maximum number of each numerical value range is a value obtained by multiplying the maximum number described above by the quotient obtained by dividing the width of the area by 40. . For example, if the width of the regions A1 to A3 is 80 mm, the number of elastic members disposed in the regions A1 to A3 is preferably in the range of 2 to 160, more preferably 2 to 2. Within the range of 40, the ventral third region and the ventral extension 4A (A4) are preferably in the range of 2 to 160, more preferably in the range of 2 to 40.

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.
Moreover, the elastic member 24 is distribute | arranged in the expansion | extension state so that it may extend along the diaper width direction at each of the back side corresponding part B4 and the extension part lower part B5 in the back side extension part 21b. Thereby, each of the back | dorsal corresponding | compatible part B4 and the extension part lower part B5 expresses the elasticity of a Y direction.

  A plurality of elastic members 24 are arranged at intervals in the X direction in each of the first to third regions B1 to B3, the back side corresponding portion B4, and the extended portion lower portion B5 in the back side seat member 2B. It is preferable. The number of elastic members arranged at intervals in the X direction is 2 to 2 for each of the regions B1 to B3 when the widths of the first to third regions B1 to B3 are about 40 mm. It is preferably within the range of 80, more preferably within the range of 2 to 20, and the back side third region B3 and the back side corresponding part B4 are preferably within the range of 2 to 80, more Preferably, it is in the range of 2 to 20, and the extension portion lower part B5 is preferably in the range of 2 to 80, and more preferably in the range of 2 to 20.

  The numerical range relating to the number of elastic members arranged on the back seat member 2B varies based on the widths of the regions B1 to B3. When the width of each of the regions B1 to B3 is larger (or smaller) than 40 mm, the maximum number of each numerical value range is a value obtained by multiplying the maximum number described above by the quotient obtained by dividing the width of the region by 40. . For example, if the width of the regions B1 to B3 is 80 mm, the number of elastic members disposed in the regions B1 to B3 is preferably in the range of 2 to 160, more preferably 2 to 2. Within the range of 40, the back side third region B3 and the back side corresponding part B4 are preferably within the range of 2 to 160, more preferably within the range of 2 to 40, and the lower part of the extension part About B5, the inside of the range of 2-160 is preferable, More preferably, it exists in the range of 2-40.

In the diaper 1, the contraction stress in the article width direction per unit length in the article longitudinal direction of the first to third regions A1 to A3 and the ventral extension part A4 in the ventral sheet member 2A is expressed as P _{A1 to} P _A4 , the contraction stress in the article width direction per elastic member is Q _{A1 to} Q _A4, and the article longitudinal direction of the first to third regions B1 to B3 and the back side corresponding part B4 in the back side seat member 2B When the shrinkage stress in the article width direction per unit length is P _{B1 to} P _B4 and the shrinkage stress in the article width direction per elastic member is Q _{B1 to} Q _B4 ,
The following relational expressions (1) to (4) are satisfied.
Ratio (P _A3 / P _A1 )> ratio (Q _A3 / Q _A1 ), ratio (P _A3 / P _A1 )> 1 (1)
Ratio (P _B3 / P _B1 )> ratio (Q _B3 / Q _B1 ), ratio (P _B3 / P _B1 )> 1 (2)
Ratio (P _A4 / P _A1 )> ratio (Q _A4 / Q _A1 ), ratio (P _A4 / P _A1 )> 1 (3)
Ratio (P _B4 / P _B1 )> ratio (Q _B4 / Q _B1 ), ratio (P _B4 / P _B1 )> 1 (4)

In relational expressions (1) and (2), regarding the shrinkage stress in the Y direction per unit length in the X direction, both the ventral seat member 2A and the back seat member 2B are more than the first regions A1 and B1. Although the three regions A3 and B3 are large, the contraction stress in the Y direction per elastic member 24 means that the difference between them is not so large.
In relational expressions (3) and (4), regarding the contraction stress in the Y direction per unit length in the X direction, both the ventral seat member 2A and the back seat member 2B are Although the four regions A4 and B4 are large, it means that the difference between them in terms of the shrinkage stress in the Y direction per one elastic member 24 is not so large.

The pants-type absorbent article in which the outer packaging material is divided into the ventral sheet member 2A and the dorsal sheet member 2B tends to slip off during wearing, but the article width direction of each of the dorsal sheet member and the ventral sheet member If the shrinkage stress is particularly increased in the region in the vicinity of the lower end portion (end portion on the crotch portion side) of the side seal portion, it is possible to effectively prevent the diaper from falling off.
However, the vicinity of the lower end portion (end portion on the crotch portion side) of the side seal portion is likely to have rubber marks on the wearer's skin, which is likely to be a burden on the skin. The reason for this is that the portion where the vicinity of the lower end portion (end portion on the crotch side) of the side seal portion abuts is a cross-sectional shape in which the wearer's body shape is close to an ellipse, and rubber marks are likely to be attached as compared with other portions It is guessed.
On the other hand, like the diaper 1, the extension parts 4A and 21b are provided in both the abdominal sheet member 2A and the back sheet member 2B, and the contraction stress per unit length is lower end of the side seal part. The contraction stress of the third region A3, B3, the abdominal extension portion A4, and the dorsal side corresponding portion B4, which is located near the portion, is larger than that of the first region A1, B1, while the contraction stress per elastic member Reduces the shrinkage stress of the third regions A3 and B3, the abdominal extension A4 and the back corresponding portion B4, and is excellent in preventing slippage during wearing, and the pressing mark of the elastic member is attached to the skin. It is difficult to obtain a diaper (pants-type absorbent article) with less burden on the skin.
In addition, by reducing the shrinkage stress per unit length of the first regions A1 and B1 arranged around the waist, it is possible to effectively prevent the waist opening peripheral edge from falling downward, and the wearer's It is also possible to prevent pressing marks from being applied around the waist, and to prevent a burden on the skin around the waist. Therefore, the shrinkage stress per unit length of the first region is reduced, and the shrinkage stress per unit length around the lower end of the side seal (the third region and the fourth region) is appropriately increased as compared with the first region. Thus, it is possible to prevent both a slip-off from the waist periphery and a slip-off from the side seal lower end periphery, and to reduce the difference in contraction stress per one of the first region and the third region, Also in the region and the fourth region, it is possible to reduce the pressing trace of the elastic member to a level substantially equal to that of the first region having a small contraction stress. From these viewpoints, the ratio (Q _A3 / Q _A1 ), ratio (Q _A4 / Q _B1 ), ratio (Q _B3 / Q _B1 ), and ratio (Q _B4 / Q _B1 ) may be 1.

Moreover, it is preferable that the diaper 1 satisfy | fills the following relational expressions (5) and (6).
P _A3 = P _A4 , Q _A3 = Q _A4 (5)
P _B3 = P _B4 , Q _B3 = Q _B4 (6)
In the relational expression (5), the contraction stress per unit length in the X direction is the same in the third region A3 and the ventral extension part A4 in the ventral sheet member 2A, and the relation in the ventral sheet member 2A is It means that the contraction stress per one elastic member 24 is the same in the three regions A3 and the ventral side extension A4.
In relational expression (6), the contraction stress in the Y direction per unit length in the X direction is the same in the third region B3 and the back side corresponding part B4 in the back side seat member 2B, and the back side seat member It means that the contraction stress in the Y direction per one elastic member 24 is the same in the third region B3 and the back side corresponding portion B4 in 2B.

By satisfying the relational expressions (5) and (6), the stress is not concentrated on either the third region or the fourth region in the peripheral edge of the lower end of the side seal where rubber marks are likely to be attached. The rubber marks can be reduced as a whole at the peripheral edge of the lower end of the side seal.
In this case, when the shrinkage stress in the Y direction per unit length in the X direction is the same, the difference between the shrinkage stresses in the Y direction per unit length in the X direction is the same as in the case where they are completely the same. The case where the absolute value of is 2.5 cN or less is also included. Further, when the shrinkage stress in the Y direction per one elastic member 24 is the same, the absolute value of the difference between the shrinkage stresses in the Y direction per both of them is 2. The case of 5 cN or less is also included.

The shrinkage stress of each area | region A1-A4 and B1-B5 is measured as follows.
[Measurement sample]
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.

[Measurement of shrinkage stress P in the Y direction per unit length in the X direction]
Tensile tester (Shimadzu's “Autograph AG-X” chuck is sandwiched at both ends of the sample and stretched at a speed of 300 mm / min. The inner dimensions of the abdominal sheet member 2A and the back sheet member 2B [Abdominal sheet member measured in a state where the sheet of the outer packaging material is not contracted by the elastic member (in other words, only the abdominal sheet member 2A and the back sheet member 2B are extended without providing the elastic member) When the length between the side seal portions of 2A and the back seat member 2B is 100 (for example, 350 mm), it is expanded to a length corresponding to 80 (for example, 280 mm) and then contracted to a length corresponding to 71 (for example, 250 mm). The tensile load (cN) per unit length (10 mm) at this time is taken as the shrinkage stress P in the Y direction per unit length in the X direction. The reason why the return force in a length equivalent to 71 when the inner dimension of the back sheet member 2B is 100 is defined is that the belly of the infant who is the main subject wearing the pants-type disposable diaper 1 of the present embodiment This is because the length of the circumference is about 71% compared to the inner diameter of the diaper, and the length of the circumference of the stomach here takes into account the change in circumference of the stomach when the posture of the infant changes. The average value of the abdominal circumference measured in the standing and sitting positions.

[Measurement of shrinkage stress Q in the Y direction per elastic member]
Tensile tester (Shimadzu's “Autograph AG-X” chuck is sandwiched at both ends of the sample and stretched at a speed of 300 mm / min. The inner dimensions of the abdominal sheet member 2A and the back sheet member 2B [Abdominal sheet member measured in a state where the sheet of the outer packaging material is not contracted by the elastic member (in other words, only the abdominal sheet member 2A and the back sheet member 2B are extended without providing the elastic member) When the length between the side seal portions of 2A and the back seat member 2B is 100 (for example, 350 mm), it is expanded to a length corresponding to 80 (for example, 280 mm) and then contracted to a length corresponding to 71 (for example, 250 mm). A value obtained by dividing the contraction stress when the sample is measured by the number of elastic members fixed to the sample is defined as a contraction stress Q in the Y direction per elastic member. The reason why the return force in the length equivalent to 71 when the inner dimensions of the seat member 2A and the back seat 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% of the inner diameter of the diaper, and the length of the belly around here is the circumference of the stomach when the posture of the infant changes. It is the average value of the abdominal circumference measured in the standing position and the sitting position in consideration of the change.

From the viewpoint of preventing slippage and preventing the elastic member from being pressed and the burden on the skin, or more reliably obtaining one or more of the effects described below, the ratio (P _A3 / P _A1 ), the ratio (P _B3 / P _B1 ), the ratio (P _A4 / P _A1 ) and the ratio (P _B4 / P _B1 ) are each preferably 1.5 to 7.0, more preferably 1.6 to 5. It is 0, More preferably, it is 1.7-3.5.
From the same viewpoint, the ratio (Q _A3 / Q _A1 ), the ratio (Q _B3 / Q _B1 ), the ratio (Q _A4 / Q _A1 ), and the ratio (Q _B4 / Q _B1 ) are It is preferable that it is 0.3-2.2, More preferably, it is 0.5-1.8, More preferably, it is 0.7-1.4.

Moreover, it is preferable that the diaper 1 satisfy | fills the following relational expressions (7) and (8).
4cN <Q _A3 <23cN (7)
4cN <Q _B3 <23cN (8)

In relational expressions (7) and (8), the contraction stress in the Y direction per one elastic member 24 in the third regions A3 and B3 exceeds 4 cN in both the ventral seat member 2A and the back seat member 2B. , Less than 23 cN.
By satisfying the relational expressions (7) and (8), even when used in situations where the temperature is high and the infant is likely to sweat, or when the rubber marks are likely to be attached such that the wearing time is long, (Rubber marks) are hard to touch the skin and the burden on the skin is small. Such rubber marks can cause not only the burden on the skin due to compression, but also redness and sweat, which can cause rashes and scratches in severe cases. In addition, even if no rash or injury occurs, the mother may feel anxiety about the onset of this, or that the child may feel uncomfortable due to pressure. However, if the shrinkage stress is reduced excessively to prevent rubber marks, diaper displacement occurs, excrement leaks from the gap generated by the displacement, and the crotch absorber absorbs. Therefore, the movement of the infant will be hindered. By satisfying the relational expressions (7) and (8), it is possible to solve both the problems of preventing rubber marks and preventing slipping off.
Q _A3 and Q _B3 are each preferably more than 4 cN and less than 20 cN, more preferably more than 4 cN and less than 15 cN.

From the viewpoints of preventing slipping and preventing the pressing marks of the elastic member and the burden on the skin, or more reliably obtaining one or more of the effects described later, Y per unit length in the X direction of the back third region B3 The shrinkage stress P _{B3 in the} direction is preferably 14 to 40 cN, particularly 17 to 35 cN, and the shrinkage stress P _{A3 in} the Y direction per unit length in the X direction of the ventral third region _A3 is 14 to 40 cN, particularly It is preferably 17 to 35 cN. Further, from the same viewpoint, the shrinkage stress P _{B4 in} the Y direction per unit length in the X direction of the back side corresponding part B4 is preferably 14 to 40 cN, particularly 17 to 35 cN, and the X direction of the extension lower part B5 The shrinkage stress P _{B5 in} the Y direction per unit length is preferably 5 to 30 cN, particularly preferably 5 to 25 cN. Similarly, the contraction stress PA4 in the Y direction per unit length in the X direction of the ventral extension _A4 is preferably 14 to 40 cN, and particularly preferably 17 to 35 cN.
In addition, it is possible to effectively prevent downward slipping of the peripheral edge of the waist opening, and further, it is also possible to prevent pressing marks around the wearer's waist, from the viewpoint of preventing a burden on the skin around the waist, The compressive stresses P _B1 and P _{A1 in} the Y direction per unit length in the X direction of the first regions B1 and A1 in the back sheet member 2B and the ventral sheet member 2A are 5 to 30 cN, particularly 5 to 25 cN, respectively. It is preferable that

From the standpoint of preventing slipping off and pressing of the elastic member and the burden on the skin, or from the viewpoint of more reliably obtaining one or more of the effects described below, the shrinkage stress in the Y direction per backside corresponding part B4 Q _B4 is preferably ₄ to 23 cN, particularly ₄ to 20 cN, and the shrinkage stress Q _{A4 in} the Y direction per one of the ventral extension _A4 is ₄ to 23 cN, particularly ₄ to 20 cN. preferable.

The diaper 1 preferably satisfies the following relational expressions (9) and (10).
P _A2 > P _A3, P _B2 > P _B3 (9)
P _A2 > P _A4, P _B2 > P _B4 (10)

In relational expression (9), regarding the contraction stress in the Y direction per unit length in the X direction, the contraction stress in the third regions A3 and B3 is obtained for both the abdominal sheet member 2A and the back sheet member 2B. It means that it is smaller than the shrinkage stress of the second regions A2 and B2.
The relational expression (10) shows that the contraction stress in the Y direction per unit length in the X direction indicates that the contraction stress in the abdominal extension part A4 and the back corresponding part B4 is less than the contraction stress in the second regions A2 and B2. Also means small.

  To increase the contraction stress per unit length of the second areas A2 and B2 that are likely to hit the wearer's iliac area, and to reduce the contraction stress per unit length of the first area of the peripheral edge of the waist opening more than the second area Thus, it is possible to effectively prevent the waist opening portion from being displaced downwardly. In addition, the third regions A3 and B3 and the abdomen are located below the wearer's iliac region, have a cross-sectional shape that is closer to an ellipse than the iliac region, and are more easily marked with rubber marks than other regions. By making the contraction stress per unit length of the side extension part A4 and the back side corresponding part B4 weaker than the second areas A2 and B2, these areas strongly hit the skin, with rubber marks, The burden on the skin can be prevented more effectively.

The ratio (P _A2 / P _A3 ), ratio (P _B2 > P _B3 ), ratio (P _A2 > P _A4 ) and ratio (P _B2 > P _B4 ) are each preferably greater than 1 and less than or equal to 4, More preferably, it is larger than 1 and 3.5 or less, More preferably, it is larger than 1 and 2.5 or less.
Further, the shrinkage stresses P _B2 and P _{A2 in} the Y direction per unit length in the X direction of the second regions B2 and A2 in the back side seat member 2B and the ventral side seat member 2A are 14 to 50 cN, respectively The shrinkage stresses Q _B2 and Q _{A2 in} the Y direction per second region B2 and A2 in each of the back seat member 2B and the ventral seat member 2A are 4 to 23 cN, respectively 4-20 cN can effectively prevent downward slipping of the peripheral edge of the waist opening, can prevent the iliac peripheral part from being pressed, and can also impose a burden on the skin of the peripheral part of the iliac part. From the viewpoint of preventing, it is preferable.

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.

Moreover, it is preferable that the diaper 1 satisfy | fills the following relational expressions (12)-(15).
Ratio (P _A2 / P _A3 )> ratio (Q _A2 / Q _A3 ), ratio (P _A2 / P _A3 )> 1 (12)
Ratio (P _B2 / P _B3 )> ratio (Q _B2 / Q _B3 ), ratio (P _B2 / P _B3 )> 1 (13)
Ratio (P _A2 / P _A4 )> Ratio (Q _A2 / Q _A4 ), Ratio (P _A2 / P _A4 )> 1 (14)
Ratio (P _B2 / P _B4 )> ratio (Q _B2 / Q _B4 ), ratio (P _B2 / P _B4 )> 1 (15)

The second region corresponds to the iliac region, and it is effective to reduce the contraction stress in the first region and increase the contraction stress in the second region in order to prevent the diaper from being displaced from the peripheral edge of the waist opening. In particular, the peripheral edge portion of the waist opening is a portion having a large variation in circumferential length due to operations such as standing and sitting, and diaper displacement due to the operation is likely to occur in the same manner or more than the peripheral edge portion of the lower end of the side seal. By satisfying the relational expressions (12) to (15) and satisfying the relational expressions (1) to (4), it is possible to prevent both the deviation from the stomach of the diaper and the deviation of the peripheral edge of the lower end of the side seal. In addition, by reducing the stress per unit number in the iliac region as well as in the waist region, rubber marks can be reduced over the entire region of the stomach. From these viewpoints, the ratio (Q _A2 / Q _A3 ), the ratio (Q _B2 / Q _B3 ), the ratio (Q _A2 / Q _A4 ), and the ratio (Q _B2 / Q _B4 ) may be 1.

  When the shrinkage stress in the Y direction per elastic member 24 is the same, as described above, the absolute difference between the shrinkage stresses in the Y direction per both of them is the same as in the case where they are completely the same. The case where the value is 2.5 cN or less is also included.

The diaper 1 has the following relationship when the contraction stress in the Y direction per unit length in the X direction of the extension part lower part B5 is P _B5 and the contraction stress in the Y direction per elastic member is Q _B5. Expression (11) is satisfied.
Ratio (P _B4 / P _B5 )> ratio (Q _B4 / Q _B5 ), ratio (P _B4 / P _B5 )> 1 (11)
In the relational expression (11), the contraction stress in the Y direction per unit length in the X direction is smaller in the extension part lower part B5 than in the back side corresponding part B4. The difference between the part B4 and the extension part lower part B5 is smaller than the difference between the back side corresponding part B4 and the extension part lower part B5 of the contraction stress per unit length in the X direction, and the contraction stress in the Y direction per one part. It means that the difference between the back corresponding part B4 and the extension part lower part B5 is not so large. The contraction stress in the Y direction per unit length in the X direction is smaller in the extension part lower part B5 than in the back side corresponding part B4. It becomes easy to fit along. Furthermore, since the contraction stress of the extension part lower part B5 is small, the width in the Y direction when the extension part lower part B5 contracts is increased. As a result, the area covering the collar part is increased, so that the area of the collar part from the diaper is increased. Prevents protrusion and reduces anxiety and discomfort with leakage. Regarding the effect of increasing the width in the Y direction when the extension part contracts, the extension rate when fixing the elastic member of the extension part lower part B5 is the extension rate when fixing the elastic member of the back side corresponding part B4. By making it smaller than the rate, the effect of further preventing the protrusion of the buttocks can be obtained. Further, making the difference in shrinkage stress per unit smaller than the difference in shrinkage stress per unit length means that the pressing trace of the elastic member in the back-side corresponding part B4 where the rubber trace is likely to stick is reduced per unit length. The shrinkage stress of the back side corresponding part B4 can be prevented by approaching the lower part of the extension part, which has a small shrinkage stress per one piece and a small shrinkage stress per one and is difficult to make rubber marks. Means that rubber marks can be prevented. From these viewpoints, the ratio (Q _B4 / Q _B5 ) may be 1.

The shrinkage stress P _B5 of the extended subordinate unit B5, as a method to be smaller than the contraction stress P _B4 dorsal corresponding portion B4, the dorsal corresponding portion B4, the article longitudinal arrangement pitch of the elastic member, the extension It is preferable that the protruding portion lower part B5 be larger than the arrangement pitch of the elastic members in the article longitudinal direction. This can reduce the bending rigidity in the X direction of the sheet member including the elastic member at the lower portion of the extension, in addition to the effect obtained by reducing the above-described shrinkage stress by increasing the arrangement pitch, In particular, it is preferable from the viewpoint of improving the fit in the lower region of the heel portion having a large curvature. The arrangement pitch is a distance between the center positions of the individual elastic members in the X direction.

Further, in the first region B1 of the back body part, the arrangement pitch of the elastic member in the article longitudinal direction is equal to the arrangement pitch of the extension part lower part B5 in the article longitudinal direction of the elastic member as in the case of the heel part. This is preferable from the viewpoint of ease of following along the periphery of the stomach around which the curvature is large and the rigidity of the sheet member including the elastic member being soft and excellent in fit, and less uncomfortable.
When the arrangement pitch is equal, in addition to the case where the arrangement pitch is completely the same, the case where the absolute value of the difference between the arrangement pitches is 2 mm or less is also included.

  Examples of a method for differentiating the contraction stress in the Y direction per unit length in the X direction between one region and the other region in the ventral sheet member 2A and the back sheet member 2B include, for example, (1) contraction stress A method in which the elongation ratio of the elastic member when fixing to the sheets 22 and 23 is different between a region having a high shrinkage stress and a region having a low shrinkage stress. (3) A method of changing the material of the elastic member to be arranged between a region having a high shrinkage stress and a region having a low shrinkage stress, and (4) a region having a high shrinkage stress and a shrinkage stress. And a method in which the arrangement pitch of the elastic members is made different in the low-region and (5) a method in which two or more of these are combined.

  As a method of making the shrinkage stress in the Y direction per elastic member different in one region and the other region in the ventral seat member 2A and the back seat member 2B, for example, (1) the shrinkage stress is A method in which the elongation ratio of the elastic member is different between the high region and the region having a low shrinkage stress, and (2) a region having a high shrinkage stress and a region having a low shrinkage stress. A method of varying the thickness of the elastic member, (3) a method of varying the material of the elastic member to be arranged 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 and a shrinkage stress. Examples thereof include a method in which the arrangement pitch of the elastic members is made different between the low region 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. Further, each of the extended portions 4A and 21b of the abdominal sheet member 2A and the back sheet member 2B has an extended portion stretchable 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. 5). 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 extending portions 4A 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, for the back side sheet member 2B, the width W1 of the side adhesion region 27 in the third region B3 and the back side corresponding portion B4 is equal to the first region B1, the second region B2, and the extension lower portion B5. In the ventral sheet member 2A, the width W1 of the side adhesive region 27 in the lower half of the third region A3 and the ventral extension portion A4 is 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. Side adhesion to the boundary area between the main body parts 20a, 20b and the extension parts 4A, 21b, in particular the third area B3 and the back corresponding part B4 of the back sheet member, and / or the corresponding area of the abdominal sheet member By providing a portion with a large width of the region 27, the portion is maintained more smoothly than the portion where the ridges 29 are formed, and the contact area with the skin increases, so that the pressure on the skin by the elastic member is dispersed. Further, it is possible to improve the slip-off preventing property while preventing the rubber marks from being attached 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 10.0 times the width of W1, and particularly preferably 4.0 to 7.5 times in order to obtain the above-described effects.

  The length L5 (see FIG. 2) of the ventral extension 4A 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. In the case of a diaper for infants, the lengths L5 and L6 of the abdominal and dorsal extending portions 4A and 21b are preferably 10 to 150 mm, more preferably 20 to 100 mm. In the case of an adult diaper, the lengths L5 and L6 of the abdominal and dorsal extending portions 4A and 21b are preferably 10 to 200 mm, more preferably 20 to 150 mm.

Further, the length L6 of the dorsal extension portion 21b is longer than the length L5 of the ventral extension portion 4A (L6> L5), but between the ventral extension portion 4A 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 4A. It is preferable from the viewpoint of improving the appearance of wearing such as fitting to the body shape and preventing the buttocks from sticking out, and improving discomfort at the time of wearing.
The lengths L5 and L6 of the ventral side extension portion 4A and the back side extension portion 21b are both lengths 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.

  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.

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

[Example 1 and Comparative Example 1]
The elastic member shown in Table 1 is arranged in the form shown in Table 1 on the abdominal sheet member and the back sheet member, and each part has the contraction stress shown in Table 1. Made diapers. 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 A4 was ½ the length L6 in the X direction of the back extension 21b. The same applies to Comparative Example 1.

  Table 2 shows the ratio of each shrinkage stress in Example 1 and Comparative Example 1.

[Evaluation]
The obtained pants-type disposable diaper was evaluated by the following methods for (1) difficulty in slipping and (2) difficulty in attaching rubber marks around the foot, and the results are shown in Table 3.

(1) Difficult to slide off The diaper of Example 1 and Comparative Example 1 is attached to a baby dynamic model equivalent to a 1 to 2 year-old child, 240 g (assumed at the time of waking up) is injected, and pseudo urine is operated for 30 minutes. We compared the amount of slippage around the foot. 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 20 mm. Δ: The amount of slip around the foot is less than 20 mm and less than 30 mm.

(2) Difficulty of sticking rubber marks around the legs The diapers of Example 1 and Comparative Example 1 were worn (used as usual) by 1 to 2 years old children, and the state of rubber marks 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 3, the diaper of the embodiment according to the present invention is excellent in slippage prevention while the outer packaging material is a pants-type absorbent article divided into a ventral sheet member and a dorsal sheet member, It can be seen that the pressing marks of the elastic member are not easily attached to the skin and the burden on the skin is small.

1 Pants-type disposable diapers (pants-type absorbent articles)
2A abdominal sheet member 2a, 2a side edge 20a abdominal body part A1 1st area A2 2nd area A3 3rd area A4 abdominal extension part 2B backside sheet member 2b, 2b side edge part 20b dorsal body part B1 1st field B2 2nd field B3 3rd field 21b Dorsal extension part B4 Dorsal side corresponding part (part corresponding to ventral side extension part in dorsal extension part)
B5 Extension part lower 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 part C Inseam G1 Waist elastic part G2 Girth elastic part G3 Extension part elastic part

Claims (10)

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,
The ventral seat member and the dorsal seat member include a ventral side and a dorsal body portion having side seal portions on both the left and right sides, and extend from the ventral side and the dorsal body portion to the crotch side, and side seal portions on both the left and right sides. The dorsal side and the dorsal extension part, and the dorsal extension part has a length in the longitudinal direction of the article that is the same as or longer than the ventral extension part,
The back side corresponding parts corresponding to the abdominal side main body part and the abdominal side extension part and the back side main body part and the abdominal side extension part of the back side extension part are all articles by elastic members arranged in the article width direction. Has elasticity in the width direction,
The ventral body part is divided into three regions by dividing the side seal part into three parts in the longitudinal direction of the article, and the first region A1, the second region A2, and the third region A3 are sequentially formed from the side closer to the waist opening, The contraction stress in the article width direction per unit length in the article longitudinal direction of the first to third regions A1 to A3 and the ventral extension part A4 in the ventral sheet member is P _{A1 to} P _A4 , per elastic member The shrinkage stress in the article width direction is Q _{A1 to} Q _A4 ,
The back side main body part is divided into three regions by equally dividing the side seal part in the longitudinal direction of the article, and the first region B1, the second region B2, and the third region B3 are sequentially formed from the side close to the waist opening, The shrinkage stress in the article width direction per unit length in the article longitudinal direction of the first to third regions B1 to B3 and the dorsal side corresponding part B4 in the back side sheet member is P _{B1 to} P _B4 , per elastic member. When the shrinkage stress in the article width direction is Q _{B1 to} Q _B4 ,
A pants-type absorbent article satisfying the following relational expressions (1) to (4).
Ratio (P _A3 / P _A1 )> ratio (Q _A3 / Q _A1 ), ratio (P _A3 / P _A1 )> 1 (1)
Ratio (P _B3 / P _B1 )> ratio (Q _B3 / Q _B1 ), ratio (P _B3 / P _B1 )> 1 (2)
Ratio (P _A4 / P _A1 )> ratio (Q _A4 / Q _A1 ), ratio (P _A4 / P _A1 )> 1 (3)
Ratio (P _B4 / P _B1 )> ratio (Q _B4 / Q _B1 ), ratio (P _B4 / P _B1 )> 1 (4) The pants-type absorbent article according to claim 1, wherein the following relational expressions (5) and (6) are satisfied.
P _A3 = P _A4 , Q _A3 = Q _A4 (5)
P _B3 = P _B4 , Q _B3 = Q _B4 (6) The pants-type absorbent article according to claim 1 or 2, wherein the following relational expressions (7) and (8) are satisfied.
4cN <Q _A3 <23cN (7)
4cN <Q _B3 <23cN (8) The pants-type absorbent article according to any one of claims 1 to 3, which satisfies the following relational expressions (9) and (10).
P _A2 > P _A3, P _B2 > P _B3 (9)
P _A2 > P _A4, P _B2 > P _B4 (10) The back-side extension part has an extension part lower part B5 that extends further to the crotch part side than the back-side corresponding part, and the extension part lower part has an article width by an elastic member arranged in the article width direction. The shrinkage stress in the article width direction per unit length in the article longitudinal direction at the lower part of the extension portion is P _B5 , and the shrinkage stress in the article width direction per elastic member is Q _B5. The pants-type absorbent article according to any one of claims 1 to 4, which satisfies the following relational expression (11).
Ratio (P _B4 / P _B5 )> ratio (Q _B4 / Q _B5 ), ratio (P _B4 / P _B5 )> 1 (11)   The arrangement pitch in the article longitudinal direction of the elastic member of the second to third regions A2 to A3 and the ventral extension A4 in the ventral sheet member is the elastic member of the first region A1 in the ventral sheet member. The pants-type absorbent article according to any one of claims 1 to 5, which is smaller than an arrangement pitch in the longitudinal direction of the article.   Articles of the elastic member in the first region B1 of the backside seat member are arranged in the longitudinal direction of the article of the elastic member of the second to third regions B2 to B3 and the backside corresponding part B4 of the backside seat member. The pants-type absorbent article according to any one of claims 1 to 6, which is smaller than an arrangement pitch in the longitudinal direction. The back side extension part has an extension part lower part B5 extending further to the crotch part side than the back side corresponding part, and both the back side corresponding part and the extension part lower part are in the article width direction. It has elasticity in the article width direction by a plurality of elastic members arranged in the
The arrangement | positioning pitch of the article | item longitudinal direction of the elastic member of the said back side corresponding | compatible part is larger than the arrangement | positioning pitch of the article | item longitudinal direction of the elastic member of the said extension part lower part, The any one of Claims 1-7. Pants-type absorbent article. The back side extension part has an extension part lower part B5 that extends further to the crotch part side than the back side corresponding part, and the first region of the back side body part and the extension part lower part are both , Having elasticity in the article width direction by a plurality of elastic members arranged in the article width direction,
The arrangement pitch of the elastic member in the longitudinal direction of the article at the lower portion of the extension part is equal to the arrangement pitch of the elastic member in the longitudinal direction of the article in the first region of the back side main body. The pants-type absorbent article according to item.   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 9, further comprising an expansion / contraction part arranged so as to pass between adjacent joint parts in the article longitudinal direction.

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