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

本発明は、使い捨ておむつ等のパンツ型吸収性物品に関する。   The present invention relates to a pants-type absorbent article such as a disposable diaper.

従来、着用者の腹側に配される腹側部、着用者の股間部に配される股下部及び着用者の背側に配される背側部に亘る砂時計状の外包材と、該外包材の内面側に固定された吸収性本体とを備え、腹側部における外包材の両側縁部と背側部における外包材の両側縁部とが接合されてウエスト開口部及び一対のレッグ開口部が形成されているパンツ型吸収性物品が知られている。
このようなパンツ型吸収性物品を連続生産する際には、外包材の帯状原反にレッグ開口部形成用の貫通孔や切り欠きを形成し、不要な部分をトリムとして除去するのが一般的である。 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.

また、従来のパンツ型吸収性物品として、外包材が、着用者の腹側に配される腹側シート部材と、着用者の背側に配される背側シート部材とに分割されており、吸収性本体が、腹側シート部材及び背側シート部材に架け渡すように固定されていると共に、腹側シート部材の左右の両側縁部と背側シート部材の左右両側縁部とが接合されているパンツ型吸収性物品が知られている。
例えば、特許文献１には、そのようなパンツ型吸収性物品として、前ベルト部分及び後ろベルト部分からなる環状弾性ベルトと吸収性本体とを備えると共に、後ろベルト部分（背側シート部材）の縦方向の長さを、前ベルト部分（腹側シート部材）の縦方向の長さよりも長くしたプルオン衣類が記載されている。 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).

また、特許文献２には、腹側外装シートと背側外装シートとから形成された筒状の胴回り部と吸収性本体とを備え、背側外装シートが背側本体部とその下側に延出する背側延出部とを有し、該背側延出部における、吸収性本体と重なる部分の両側に延出した臀部カバー部に設けられた第２弾性伸縮部材の伸張率を、背側本体部の中間部および下端部に設けられた第１弾性伸縮部材の伸張率よりも高くしたパンツ型紙おむつが記載されている。
また、特許文献３にも、腹側外装シートと背側外装シートとから形成された筒状の胴回り部と吸収性本体とを備え、背側外装シートが背側本体部とその下側に延出する背側延出部とを有するパンツ型紙おむつが記載されており、同公報には、腹側外装シートも、腹側本体部と腹側延出部とを有していても良いことが記載されている。 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.

特表２００８−５０８０８２号公報Special table 2008-508082 特開２００８−１７８６８２号公報JP 2008-178682 A 特開２００８−２１２２４９号公報JP 2008-212249 A

外包材が、着用者の腹側に配される腹側シート部材と着用者の背側に配される背側シート部材とに分割されたパンツ型吸収性物品は、例えば、腹側シート部材の帯状原反と背側シート部材の帯状原反とを離間させて搬送しつつ、吸収性本体を、両者間に架け渡すように間欠的に固定し、次いで、腹側シート部材の帯状原反と背側シート部材の帯状原反とが重なるように二つ折りした後、サイドシール部形成用の接合を行い、その接合と同時又はその後に切断して個々の使い捨ておむつに分割することにより効率的に製造することができ、腹側に配される部分と背側に配される部分とが連続する幅広の外包材にレッグ開口部形成用の貫通孔や切り欠きを形成する場合に比して、外包材の原反からのトリムの除去を不要としたり、除去すべきトリムの小型化等を図ることができる。   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.

しかし、外包材が腹側シート部材と背側シート部材とに分割された従来のパンツ型吸収性物品は、着用中にずれ落ちが生じやすいという問題があった。また、前側の延出部分が存在しないため、装着時において衣服としてみた時に完全に肌を覆うことができず、外観的な問題が生じる。
この問題を解決するべく、本発明者らが検討したところ、背側シート部材及び腹側シート部材それぞれの物品幅方向の収縮応力を、サイドシール部の下端部（股下部側の端部）付近の領域において特に高めると、おむつのずれ落ちを効果的に防止することができることが判ったが、当該領域のみに、ずれ落ちを防止できるだけの強い収縮応力を持たせた場合には、当該領域が、肌に強く当たり、ゴム跡が付いたり、肌への負担となる問題があった。 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.

従って、本発明は、外包材が腹側シート部材と背側シート部材とに分割されたパンツ型吸収性物品でありながら、ずれ落ち防止性に優れ、弾性部材の押圧跡が肌に付きにくく、肌への負担が少ないパンツ型吸収性物品に関する。   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.

本発明は、着用者の腹側に配される矩形状の腹側シート部材と、着用者の背側に配される矩形状の背側シート部材と、腹側シート部材及び背側シート部材に架け渡して固定された吸収性本体とを具備し、ウエスト開口部及び一対のレッグ開口部を有するパンツ型吸収性物品であって、腹側シート部材及び背側シート部材は、左右両側にサイドシール部を有する腹側及び背側本体部と、該腹側及び背側本体部から股下部側に延出し、左右両側にサイドシール部を有しない腹側及び背側延出部とを有しており、背側延出部は、物品長手方向の長さが、腹側延出部と同じかそれよりも長く、腹側本体部及び腹側延出部並びに背側本体部及び背側延出部の腹側延出部に対応する背側対応部は、何れも、物品幅方向に配された弾性部材により物品幅方向に伸縮性を有しており、腹側本体部を、前記サイドシール部を物品長手方向に３等分して３領域に区分し、ウエスト開口部に近い側から順に第１領域Ａ１、第２領域Ａ２及び第３領域Ａ３とし、腹側シート部材における第１〜第３領域Ａ１〜Ａ３及び腹側延出部Ａ４の、物品長手方向の単位長さ当たりの物品幅方向の収縮応力をＰ_A1〜Ｐ_A4、弾性部材１本当たりの物品幅方向の収縮応力をＱ_A1〜Ｑ_A4とすると共に、背側本体部を、前記サイドシール部を物品長手方向に３等分して３領域に区分し、ウエスト開口部に近い側から順に第１領域Ｂ１、第２領域Ｂ２及び第３領域Ｂ３とし、背側シート部材における第１〜第３領域Ｂ１〜Ｂ３及び背側対応部Ｂ４の、物品長手方向の単位長さ当たりの物品幅方向の収縮応力をＰ_B1〜Ｐ_B4、弾性部材１本当たりの物品幅方向の収縮応力をＱ_B1〜Ｑ_B4としたときに、下記関係式（１）〜（４）を満たすパンツ型吸収性物品を提供するものである。
比（Ｐ_A3／Ｐ_A1）＞比（Ｑ_A3／Ｑ_A1），比（Ｐ_A3／Ｐ_A1）＞１ ・・・（１）
比（Ｐ_B3／Ｐ_B1）＞比（Ｑ_B3／Ｑ_B1），比（Ｐ_B3／Ｐ_B1）＞１ ・・・（２）
比（Ｐ_A4／Ｐ_A1）＞比（Ｑ_A4／Ｑ_A1），比（Ｐ_A4／Ｐ_A1）＞１ ・・・（３）
比（Ｐ_B4／Ｐ_B1）＞比（Ｑ_B4／Ｑ_B1），比（Ｐ_B4／Ｐ_B1）＞１ ・・・（４） 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)

本発明のパンツ型吸収性物品は、外包材が腹側シート部材と背側シート部材とに分割されたパンツ型吸収性物品でありながら、ずれ落ち防止性に優れ、弾性部材の押圧跡が肌に付きにくく、肌への負担が少ないものである。   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.

図１は、本発明の一実施形態であるパンツ型使い捨ておむつの使用状態（着用状態）を示す斜視図である。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. 図２は、図１に示すパンツ型使い捨ておむつの展開且つ伸長状態を示す一部破断平面図である。展開且つ伸長状態とは、おむつの両側部に存する接合部（サイドシール部）を引き剥がして、パンツ型吸収性物品を展開状態とし、その展開状態の吸収性物品を、各部の弾性部材を伸長させて、設計寸法（弾性部材の影響を一切排除した状態で平面状に広げたときの寸法と同じ）となるまで拡げた状態をいう。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). 図３は、図１に示すパンツ型使い捨ておむつの腹側部側をおむつ外面側から見た伸長状態の一部破断拡大図である。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. 図４は、図１に示すパンツ型使い捨ておむつの背側部側をおむつ外面側から見た伸長状態の一部破断拡大図である。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. 図５は、図１に示すパンツ型使い捨ておむつにおける各伸縮部のおむつ幅方向に沿う断面を示す図であり、（ａ）は、弾性部材を伸長させて襞をなくした状態、（ｂ）は弾性部材が収縮して襞が形成されている状態を示す図である。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.

以下、本発明のパンツ型吸収性物品を、その好ましい実施形態に基づき図面を参照しながら説明する。
本発明の一実施形態であるパンツ型使い捨ておむつ１（以下、おむつ１ともいう）は、図１及び図２に示すように、着用者の腹側に配される矩形状の腹側シート部材２Ａと、着用者の背側に配される矩形状の背側シート部材２Ｂと、腹側シート部材２Ａ及び背側シート部材２Ｂに架け渡して固定された吸収性本体３とを具備し、腹側シート部材２Ａの両側縁部２ａ，２ａと背側シート部材２Ｂの両側縁部２ｂ，２ｂとが接合されて、一対のサイドシール部４，４が形成されている。 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.

おむつ１は、図１及び図２に示すように、着用時に、着用者の腹側に配される腹側部Ａと、着用者の背側に配される背側部Ｂと、腹側部Ａと背側部Ｂとの間に位置し、着用者の股間部に配される股下部Ｃを有している。おむつ長手方向（物品長手方向）は、腹側部Ａから股下部Ｃを経て背側部Ｂに亘る方向又はその逆方向（図２中Ｘ方向）であり、おむつ幅方向（物品幅方向）は、着用者の胴回り方向に沿う方向であり、物品長手方向と交差する方向（図２中Ｙ方向）である。以下、おむつ長手方向（物品長手方向）を単にＸ方向、おむつ幅方向（物品幅方向）を単にＹ方向ともいう。   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.

サイドシール部４は、図２に示すように、Ｘ方向の長さが、腹側シート部材２Ａの長さＬａ及び背側シート部材２Ｂの長さＬｂの何れよりも短く形成されており、腹側シート部材２Ａ及び背側シート部材２Ｂのそれぞれに、左右両側にサイドシール部４，４を有する本体部２０ａ，２０ｂと、本体部２０ａ，２０ｂから股下部Ｃ側に延出し、左右両側にサイドシール部４，４を有しない延出部４Ａ，２１ｂとが形成されている。
以下、腹側シート部材２Ａの本体部２０ａ及び延出部４Ａを、腹側本体部２０ａ及び腹側延出部４Ａともいい、背側シート部材２Ｂの本体部２０ｂ及び延出部２１ｂを、背側本体部２０ｂ及び背側延出部２１ｂともいう。 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.

本実施形態のおむつ１について、より具体的に説明すると、おむつ１の吸収性本体３は、図２に示すように、液透過性の表面シート３１、液不透過性又は撥水性の裏面シート３２、及び両シート３１、３２間に介在配置された液保持性の吸収体３３を有しており、Ｘ方向に長い長方形状に形成されている。吸収体３３は、パルプ繊維等の繊維の集合体（不織布であっても良い）からなる吸収性コア又はこれに吸水性ポリマーの粒子を保持させてなる吸収性コアと、該吸収性コアを被覆するコアラップシート（図示せず）からなる。吸収体３３も、Ｘ方向に長い長方形状に形成されている。吸収体３３は、長手方向の両側に、吸収性コアの形成材料が存在しないか又は該形成材料の坪量が他の部分より少ない低剛性部３３ｄを有している。吸収体３３が低剛性部３３ｄで屈曲し易いことにより、おむつ着用時に、吸収体３３又は吸収性本体３の両側部が着用者の肌側に向かって立ち上がり易くなっている。   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.

吸収性本体３の長手方向の両側部には、液抵抗性ないし撥水性で且つ通気性の素材から構成された側方カフス３４，３４が形成されている。各側方カフス３４の自由端の近傍には、側方カフス弾性部材３５が伸長状態で配されている。おむつ１の着用中には、側方カフス弾性部材３５が収縮することにより側方カフス３４が起立し、吸収性本体３から幅方向外方への液の流出が阻止される。表面シート３１、裏面シート３２、及び吸収体３３の吸収性コアやコアラップシートとしては、それぞれ、この種の吸収性物品に従来用いられているものと同様のものを用いることができる。吸収性本体３の外側には、裏面シート３２に重ねて、不織布やフィルム等の外装シートを配することもできる。   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.

腹側シート部材２Ａは、おむつ１の展開且つ伸長状態（図２参照）において、横長の長方形状をなしており、おむつ長手方向（Ｘ方向）に沿う左右一対の側縁部２ａ，２ａと、おむつ幅方向（Ｙ方向）に沿う上下一対の端縁部２ｃ，２ｄ（上側端縁部２ｃ、下側端縁部２ｄ）とを有している。背側シート部材２Ｂも、同様に、おむつ１の展開且つ伸長状態（図２参照）において、横長の長方形状をなしており、Ｘ方向に沿う左右一対の側縁部２ｂ，２ｂと、おむつ幅方向（Ｙ方向）に沿う上下一対の端縁部２ｃ，２ｄ（上側端縁部２ｃ、下側端縁部２ｄ）とを有している。腹側シート部材２Ａと背側シート部材２Ｂは、図２に示すように、おむつ長手方向（Ｘ方向）の長さがおむつ幅方向（Ｙ方向）において均一である。   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).

そして、腹側シート部材２Ａの側縁部２ａ（詳細には、その一部である接合部２ａ’）と、背側シート部材２Ｂの側縁部２ｂ（詳細には、その一部である接合部２ｂ’）とが接合されていることによって、おむつ１に、前述した一対のサイドシール部４，４が形成されている。この接合には、例えばヒートシール、高周波シール、超音波シール、接着剤等の公知の接合手段が用いられる。また、この接合によって、サイドシール部４，４と共に、ウエスト開口部５及び一対のレッグ開口部６，６が形成されている。   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.

吸収性本体３は、長手方向の一端側（腹側シート部材２Ａと重なっている部分）が、腹側シート部材２ＡのＹ方向の中央領域に接着剤を介して固定され、長手方向の他端側（背側シート部材２Ｂと重なっている部分）が、背側シート部材２ＢのＹ方向の中央領域に接着剤を介して固定されている。   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.

おむつ１における腹側シート部材２Ａ及び背側シート部材２Ｂは何れも、図３及び図４に示すように、おむつの外面をなす外層シート２２と、外層シート２２の内面側に配された内層シート２３と、両シート２２，２３間に配された複数本の糸状の弾性部材２４とを備えており、腹側本体部２０ａ及び背側本体部２０ｂに、それぞれ、ウエスト伸縮部Ｇ１及び胴回り伸縮部Ｇ２が形成され、腹側延出部４Ａ及び背側延出部２１ｂに、延出部伸縮部Ｇ３が形成されている。   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.

ウエスト伸縮部Ｇ１は、腹側シート部材２Ａ及び背側シート部材２Ｂのそれぞれにおいて、おむつ１の長手方向（Ｘ方向）における、吸収性本体３の長手方向の端部３ａ，３ｂより外方に形成されている。胴回り伸縮部Ｇ２は、腹側シート部材２Ａ及び背側シート部材２Ｂのそれぞれにおいて、Ｘ方向における、ウエスト伸縮部Ｇ１と腹側延出部４Ａ又は背側延出部２１ｂとの間に形成されている。延出部伸縮部Ｇ３は、腹側延出部４Ａ又は背側延出部２１ｂに形成されている。胴回り伸縮部Ｇ２及び延出部伸縮部Ｇ３は、それぞれ、おむつ１の幅方向（Ｙ方向）における、少なくとも、吸収性本体３の長手方向の両側縁それぞれより外方に位置する部分に形成されている。   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.

図３及び図４に示すおむつ１においては、ウエスト伸縮部Ｇ１は、腹側シート部材２Ａ又は背側シート部材２Ｂにおける側部接着領域２７，２７間の全域に亘って伸縮性を発現するように形成されており、他方、胴回り伸縮部Ｇ２及び延出部伸縮部Ｇ３は、吸収性本体３の両側縁の外方においては伸縮性を発現し、吸収性本体３と重なる部分、特に吸収性本体３の幅方向中央部と重なる部分において伸縮性を発現しないように、おむつ１の左右に分割された状態に形成されている。   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.

腹側本体部２０ａ、背側本体部２０ｂ、腹側延出部４Ａ及び背側延出部２１ｂには、それぞれ、複数本の弾性部材２４が、それぞれおむつ幅方向に沿って延びるように、且つおむつの長手方向に間隔を開けて伸長状態で配されている。   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.

本実施形態においては、背側延出部２１ｂのＸ方向の長さＬ６が、腹側延出部４ＡのＸ方向の長さＬ５よりも長い。そのため、背側延出部２１ｂは、腹側延出部４Ａに対応する背側対応部Ｂ４と、背側対応部Ｂ４より更に股下部Ｃ側に延出する延出部下部Ｂ５を有している。
背側対応部Ｂ４は、背側延出部２１ｂのうち、背側本体部２０ｂより股下部Ｃ側に位置し、背側本体部２０ｂからの距離が、ゼロ以上で、腹側延出部４ＡのＸ方向の長さＬ５以下の範囲である。
これに対して、腹側延出部４ＡのＸ方向の長さＬ５が、背側延出部２１ｂのＸ方向の長さＬ６と同じである場合には、背側延出部２１ｂの全体が、背側対応部Ｂ４となる。 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.

そして、腹側本体部２０ａを、図２及び図３に示すように、サイドシール部４を物品長手方向（Ｘ方向）に３等分して３領域Ａ１〜Ａ３に区分し、ウエスト開口部に近い側から順に第１領域Ａ１、第２領域Ａ２及び第３領域Ａ３としたとき、第１領域〜第３領域Ａ１〜Ａ３のそれぞれに、弾性部材２４が、おむつ幅方向に沿って延びるように伸長状態で配されている。これにより、第１領域〜第３領域Ａ１〜Ａ３のそれぞれがＹ方向の伸縮性を発現する。
また、腹側シート部材２Ａにおける腹側延出部４Ａにも、弾性部材２４が、おむつ幅方向に沿って延びるように伸長状態で配されている。これにより、腹側延出部４ＡもＹ方向の伸縮性を発現する。 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.

腹側シート部材２Ａにおける、第１領域〜第３領域Ａ１〜Ａ３及び腹側延出部４Ａ（Ａ４）のそれぞれには、弾性部材２４が、Ｘ方向に間隔を開けて複数本配されていることが好ましい。Ｘ方向に間隔を開けて配されている弾性部材の本数は、第１領域〜第３領域Ａ１〜Ａ３の各幅を仮に４０ｍｍ程度とした場合には、各領域Ａ１〜Ａ３についてはそれぞれ、２〜８０本の範囲内であることが好ましく、より好ましくは２〜２０本の範囲内であり、腹側第３領域Ａ３及び腹側延出部４Ａ（Ａ４）については、２〜８０本の範囲内が好ましく、より好ましくは２〜２０本の範囲内である。
腹側シート部材２Ａに配された弾性部材の本数に係る数値範囲は、各領域Ａ１〜Ａ３の幅に基づいて変動する。各領域Ａ１〜Ａ３の幅が４０ｍｍよりも大きい（又は小さい）場合には、各数値範囲の最大本数は、前述した最大本数に、該領域の幅を４０で除した商を乗算した値となる。例えば、仮に領域Ａ１〜Ａ３の幅を８０ｍｍとした場合には、各領域Ａ１〜Ａ３に配される弾性部材の本数は、２〜１６０本の範囲内であることが好ましく、より好ましくは２〜４０本の範囲内であり、腹側第３領域及び腹側延出部４Ａ（Ａ４）については、２〜１６０本の範囲内が好ましく、より好ましくは２〜４０本の範囲内である。 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.

また、背側本体部２０ｂを、図２及び図４に示すように、サイドシール部４を物品長手方向（Ｘ方向）に３等分して３領域Ｂ１〜Ｂ３に区分し、ウエスト開口部に近い側から順に第１領域Ｂ１、第２領域Ｂ２及び第３領域Ｂ３としたとき、第１領域〜第３領域Ｂ１〜Ｂ３のそれぞれに、弾性部材２４が、おむつ幅方向に沿って延びるように伸長状態で配されている。これにより、第１領域〜第３領域Ｂ１〜Ｂ３のそれぞれがＹ方向の伸縮性を発現する。
また、背側延出部２１ｂにおける背側対応部Ｂ４及び延出部下部Ｂ５のそれぞれに、弾性部材２４が、おむつ幅方向に沿って延びるように伸長状態で配されている。これにより、背側対応部Ｂ４及び延出部下部Ｂ５のそれぞれがＹ方向の伸縮性を発現する。 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.

背側シート部材２Ｂにおける、第１領域〜第３領域Ｂ１〜Ｂ３、背側対応部Ｂ４及び延出部下部Ｂ５のそれぞれには、弾性部材２４が、Ｘ方向に間隔を開けて複数本配されていることが好ましい。Ｘ方向に間隔を開けて配されている弾性部材の本数は、第１領域〜第３領域Ｂ１〜Ｂ３の各幅を仮に４０ｍｍ程度とした場合、各領域Ｂ１〜Ｂ３については、それぞれ、２〜８０本の範囲内であることが好ましく、より好ましくは２〜２０本の範囲内であり、背側第３領域Ｂ３及び背側対応部Ｂ４については、２〜８０本の範囲内が好ましく、より好ましくは２〜２０本の範囲内であり、延出部下部Ｂ５については、２〜８０本の範囲内が好ましく、より好ましくは２〜２０本の範囲内である。   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.

背側シート部材２Ｂに配された弾性部材の本数に係る数値範囲は、各領域Ｂ１〜Ｂ３の幅に基づいて変動する。各領域Ｂ１〜Ｂ３の幅が４０ｍｍよりも大きい（又は小さい）場合には、各数値範囲の最大本数は、前述した最大本数に、該領域の幅を４０で除した商を乗算した値となる。例えば、仮に領域Ｂ１〜Ｂ３の幅を８０ｍｍとした場合には、各領域Ｂ１〜Ｂ３に配される弾性部材の本数は、２〜１６０本の範囲内であることが好ましく、より好ましくは２〜４０本の範囲内であり、背側第３領域Ｂ３及び背側対応部Ｂ４については、２〜１６０本の範囲内が好ましく、より好ましくは２〜４０本の範囲内であり、延出部下部Ｂ５については、２〜１６０本の範囲内が好ましく、より好ましくは２〜４０本の範囲内である。   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.

おむつ１は、腹側シート部材２Ａにおける、第１〜第３領域Ａ１〜Ａ３及び腹側延出部Ａ４の、物品長手方向の単位長さ当たりの物品幅方向の収縮応力を、Ｐ_A1〜Ｐ_A4、弾性部材１本当たりの物品幅方向の収縮応力をＱ_A1〜Ｑ_A4とすると共に、背側シート部材２Ｂにおける第１〜第３領域Ｂ１〜Ｂ３及び背側対応部Ｂ４の、物品長手方向の単位長さ当たりの物品幅方向の収縮応力をＰ_B1〜Ｐ_B4、弾性部材１本当たりの物品幅方向の収縮応力をＱ_B1〜Ｑ_B4としたときに、
下記関係式（１）〜（４）を満たしている。
比（Ｐ_A3／Ｐ_A1）＞比（Ｑ_A3／Ｑ_A1），比（Ｐ_A3／Ｐ_A1）＞１ ・・・（１）
比（Ｐ_B3／Ｐ_B1）＞比（Ｑ_B3／Ｑ_B1），比（Ｐ_B3／Ｐ_B1）＞１ ・・・（２）
比（Ｐ_A4／Ｐ_A1）＞比（Ｑ_A4／Ｑ_A1），比（Ｐ_A4／Ｐ_A1）＞１ ・・・（３）
比（Ｐ_B4／Ｐ_B1）＞比（Ｑ_B4／Ｑ_B1），比（Ｐ_B4／Ｐ_B1）＞１ ・・・（４） 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)

関係式（１）及び（２）は、Ｘ方向の単位長さ当たりのＹ方向の収縮応力については、腹側シート部材２Ａ及び背側シート部材２Ｂの何れも、第１領域Ａ１，Ｂ１より第３領域Ａ３，Ｂ３が大きいが、弾性部材２４の１本当たりのＹ方向の収縮応力については、両者の差は、そこまで大きくないことを意味する。
関係式（３）及び（４）は、Ｘ方向の単位長さ当たりのＹ方向の収縮応力については、腹側シート部材２Ａ及び背側シート部材２Ｂの何れも、第１領域Ａ１，Ｂ１より第４領域Ａ４，Ｂ４が大きいが、弾性部材２４の１本当たりのＹ方向の収縮応力についての両者の差は、そこまで大きくないことを意味する。 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.

外包材が腹側シート部材２Ａと背側シート部材２Ｂとに分割されたパンツ型吸収性物品は、着用中にずれ落ちが生じやすいが、背側シート部材及び腹側シート部材それぞれの物品幅方向の収縮応力を、サイドシール部の下端部（股下部側の端部）付近の領域において特に高めると、おむつのずれ落ちを効果的に防止することができる。
しかし、サイドシール部の下端部（股下部側の端部）付近は、着用者の肌にゴム跡が付き易く、肌への負担となり易い。この理由は、サイドシール部の下端部（股下部側の端部）付近が当接する部位は、着用者の体型が楕円に近い断面形状であり、他の部分と比較してゴム跡が付きやすいと推測される。
これに対して、おむつ１のように、腹側シート部材２Ａ及び背側シート部材２Ｂの両方に、延出部４Ａ，２１ｂを設け、単位長さ当たりの収縮応力については、サイドシール部の下端部付近に位置する、第３領域Ａ３，Ｂ３並びに腹側延出部Ａ４及び背側対応部Ｂ４の収縮応力を、第１領域Ａ１，Ｂ１より大きくする一方、弾性部材の１本当たりの収縮応力は、第３領域Ａ３，Ｂ３並びに腹側延出部Ａ４及び背側対応部Ｂ４の収縮応力を低減させることで、着用中におけるずれ落ち防止性に優れると共に、弾性部材の押圧跡が肌に付きにくく、肌への負担が少ないおむつ（パンツ型吸収性物品）が得られる。
また、ウエスト周りに配される第１領域Ａ１，Ｂ１の単位長さ当たりの収縮応力を低減することで、ウエスト開口部周縁部の下方へのずれ落ちを効果的に防止でき、更に着用者のウエスト周りに、押圧跡を付けることも防止され、ウエスト周りの肌への負担も防止することができる。よって、第１領域の単位長さ当たりの収縮応力を低減し、更にサイドシール下端部周辺（第３領域、第４領域）の単位長さあたりの収縮応力を第１領域よりも適正に高めることで、ウエスト周縁部からのずれ落ちとサイドシール下端部周辺からのずれ落ちの両方を防止でき、かつ第１領域と第３領域の１本あたりの収縮応力の差を小さくすることで、第３領域、第４領域についても収縮応力の小さい第１領域とほぼ同等レベルのまで弾性部材の押圧跡を軽減することが可能である。これらの観点から、比（Ｑ_A3／Ｑ_A1）、比（Ｑ_A4／Ｑ_B1）、比（Ｑ_B3／Ｑ_B1）、比（Ｑ_B4／Ｑ_B1）は１であってもよい。 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.

また、おむつ１は、下記関係式（５）及び（６）を満たしていることが好ましい。
Ｐ_A3＝Ｐ_A4、Ｑ_A3＝Ｑ_A4 ・・・（５）
Ｐ_B3＝Ｐ_B4、Ｑ_B3＝Ｑ_B4 ・・・（６）
関係式（５）は、腹側シート部材２Ａにおける第３領域Ａ３と腹側延出部Ａ４とで、Ｘ方向の単位長さ当たりの収縮応力が同じであり、また、腹側シート部材２Ａにおける第３領域Ａ３と腹側延出部Ａ４とで、弾性部材２４の１本当たりの収縮応力も同じであることを意味している。
関係式（６）は、背側シート部材２Ｂにおける第３領域Ｂ３と背側対応部Ｂ４とで、Ｘ方向の単位長さ当たりのＹ方向の収縮応力が同じであり、また、背側シート部材２Ｂにおける第３領域Ｂ３と背側対応部Ｂ４とで、弾性部材２４の１本当たりのＹ方向の収縮応力も同じであることを意味している。 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.

関係式（５）、（６）を満たすことで、ゴム跡のつきやすいサイドシール下端部周縁部において、第３領域、または第４領域のいずれかに応力が集中することがなく、均一に応力を低減することができ、サイドシール下端部周縁部において全体的にゴム跡を低減することができる。
ここでいう、Ｘ方向の単位長さ当たりのＹ方向の収縮応力が同じである場合には、完全に同一の場合の他、両者のＸ方向の単位長さ当たりのＹ方向の収縮応力の差の絶対値が２．５ｃＮ以下である場合も含まれる。また、弾性部材２４の１本当たりのＹ方向の収縮応力が同じである場合には、完全に同一の場合の他、両者の１本当たりのＹ方向の収縮応力の差の絶対値が２．５ｃＮ以下である場合も含まれる。 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.

各領域Ａ１〜Ａ４，Ｂ１〜Ｂ５の収縮応力は、以下のようにして測定する。
〔測定サンプル〕
おむつのサイドシール部を剥離し、図２のように伸張、展開して平面状に拡げ、腹側シート部材２Ａ及び背側シート部材２Ｂのそれぞれについて、Ａ１〜Ａ４、Ｂ１〜Ｂ５の領域をそれぞれおむつ幅方向と平行な直線に沿って切断して切り出し、両部材２Ａ，２Ｂの両側縁部間の全長に亘る長さの各領域の短冊ないし帯状のサンプルを得る。この切り出しの際には、腹側シート部材２Ａ及び背側シート部材２Ｂのみならず、吸収性本体３等を含むおむつ全体を切断し、吸収体を取り除く。吸収体を取り除いてから、腹側シート部材２Ａ及び背側シート部材２Ｂを各領域に切断しても良い。領域の境界部に弾性部材が存在する場合は、近接する弾性体以外の部分で切断する。 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.

〔Ｘ方向の単位長さ当たりのＹ方向の収縮応力Ｐの測定〕
引張試験器（ＳＨＩＭＡＤＺＵ社製「オートグラフ ＡＧ−Ｘ」のチャックに、サンプルの両端を挟み、３００ｍｍ／ｍｉｎの速度の速度で、伸長させ、腹側シート部材２Ａ及び背側シート部材２Ｂの内寸〔弾性部材により外包材のシートが収縮していない状態（換言すれば弾性部材を配さずに腹側シート部材２Ａ及び背側シート部材２Ｂのみを伸展させた状態）で測定した腹側シート部材２Ａ及び背側シート部材２Ｂのサイドシール部間の長さを１００（例えば３５０ｍｍ）としたときの、８０相当（例えば２８０ｍｍ）の長さまで伸長させた後に、７１相当（例えば２５０ｍｍ）の長さまで収縮させたときの単位長さ（１０ｍｍ）あたりの引張り荷重（ｃＮ）をＸ方向の単位長さ当たりのＹ方向の収縮応力Ｐとする。腹側シート部材２Ａ及び背側シート部材２Ｂの内寸を１００としたときの７１相当の長さにおける戻りの力を規定した理由は、本実施形態のパンツ型使い捨ておむつ１を着用する主たる対象者である幼児の腹回りの長さがおむつ内寸と比して７１％程度となるからである。なお、ここで言う腹回りの長さは、幼児の姿勢が変化したときの腹回りの周長の変化を考慮し、立位および座位で測定した腹回りの平均値である。 [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.

〔弾性部材１本当たりのＹ方向の収縮応力Ｑの測定〕
引張試験器（ＳＨＩＭＡＤＺＵ社製「オートグラフ ＡＧ−Ｘ」のチャックに、サンプルの両端を挟み、３００ｍｍ／ｍｉｎの速度の速度で、伸長させ、腹側シート部材２Ａ及び背側シート部材２Ｂの内寸〔弾性部材により外包材のシートが収縮していない状態（換言すれば弾性部材を配さずに腹側シート部材２Ａ及び背側シート部材２Ｂのみを伸展させた状態）で測定した腹側シート部材２Ａ及び背側シート部材２Ｂのサイドシール部間の長さを１００（例えば３５０ｍｍ）としたときの、８０相当（例えば２８０ｍｍ）の長さまで伸長させた後に、７１相当（例えば２５０ｍｍ）の長さまで収縮させたときの収縮応力を測定したサンプルに固定されている弾性部材の本数で割った値を弾性部材１本当たりのＹ方向の収縮応力Ｑとする。腹側シート部材２Ａ及び背側シート部材２Ｂの内寸を１００としたときの７１相当の長さにおける戻りの力を規定した理由は、本実施形態のパンツ型使い捨ておむつ１を着用する主たる対象者である幼児の腹回りの長さがおむつ内寸と比して７１％程度となるからである。なお、ここで言う腹回りの長さは、幼児の姿勢が変化したときの腹回りの周長の変化を考慮し、立位および座位で測定した腹回りの平均値である。 [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.

ずれ落ち防止及び弾性部材の押圧跡や肌への負担防止の観点、あるいは後述する効果の一又は二以上をより確実に得る観点から、前記比（Ｐ_A3／Ｐ_A1）、前記比（Ｐ_B3／Ｐ_B1）、前記比（Ｐ_A4／Ｐ_A1）及び前記比（Ｐ_B4／Ｐ_B1）は、それぞれ、１．５〜７．０であることが好ましく、より好ましくは１．６〜５．０、更に好ましくは１．７〜３．５である。
また、同様の観点から、前記比（Ｑ_A3／Ｑ_A1）、前記比（Ｑ_B3／Ｑ_B1）、前記比（Ｑ_A4／Ｑ_A1）及び前記比（Ｑ_B4／Ｑ_B1）は、それぞれ、０．３〜２．２であることが好ましく、より好ましくは０．５〜１．８、更に好ましくは０．７〜１．４である。 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.

また、おむつ１は、下記関係式（７）及び（８）を満たしていることが好ましい。
４ｃＮ＜Ｑ_A3＜２３ｃＮ ・・・（７）
４ｃＮ＜Ｑ_B3＜２３ｃＮ ・・・（８） 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)

関係式（７）及び（８）は、腹側シート部材２Ａ及び背側シート部材２Ｂの何れも、第３領域Ａ３，Ｂ３の弾性部材２４の１本当たりのＹ方向の収縮応力が、４ｃＮ超、２３ｃＮ未満であることを意味する。
関係式（７）及び（８）を満たすことにより、気温が高く幼児が汗ばみやすい時期や、装着時間が長時間であるようなゴム跡がつきやすい状況で使用しても弾性部材の押圧跡（ゴム跡）が肌につきにくく、肌への負担が少ない。こういったゴム跡は、圧迫による肌への負担のみならず、赤みや汗も、重篤な場合にはかぶれ、傷の原因にもなりかねない。また、カブレや傷が発症しなくても、母親はこれらの発症の不安や、子供が圧迫による違和感を感じているのではないかという不安を感じることが考えられる。しかし、ゴム跡を防止するために過度に収縮応力を低下させれば、おむつのずれが発生し、ずれにより発生した隙間から***物が漏れたり、股間部の吸収体が垂れ下がった様になることで、幼児の動きを妨げることになる。関係式（７）及び（８）を満たすことにより、これらのゴム跡防止とズリ落ち防止の両方の課題を解決することができる。
Ｑ_A3及びＱ_B3は、それぞれ、４ｃＮ超２０ｃＮ未満であることが、より好ましく、４ｃＮ超１５ｃＮ未満であることが更に好ましい。 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.

ずれ落ち防止及び弾性部材の押圧跡や肌への負担防止の観点、あるいは後述する効果の一又は二以上をより確実に得る観点から、背側第３領域Ｂ３のＸ方向単位長さあたりのＹ方向の収縮応力Ｐ_B3は、１４〜４０ｃＮ、特に１７〜３５ｃＮであることが好ましく、腹側第３領域Ａ３のＸ方向単位長さあたりのＹ方向の収縮応力Ｐ_A3は、１４〜４０ｃＮ、特に１７〜３５ｃＮであることが好ましい。また同様の観点から、背側対応部Ｂ４のＸ方向単位長さあたりのＹ方向の収縮応力Ｐ_B4は、１４〜４０ｃＮ、特に１７〜３５ｃＮであることが好ましく、延出部下部Ｂ５のＸ方向単位長さあたりのＹ方向の収縮応力Ｐ_B5は、５〜３０ｃＮ、特に５〜２５ｃＮであることが好ましい。同様に、腹側延出部Ａ４のＸ方向単位長さあたりのＹ方向の収縮応力Ｐ_A4は、１４〜４０ｃＮ、特に１７〜３５ｃＮであることが好ましい。
また、ウエスト開口部周縁部の下方へのずれ落ちを効果的に防止でき、更に着用者のウエスト周りに、押圧跡を付けることも防止され、ウエスト周りの肌への負担も防止する観点から、背側シート部材２Ｂ及び腹側シート部材２Ａのそれぞれにおいての第１領域Ｂ１，Ａ１のＸ方向単位長さあたりのＹ方向の縮応力Ｐ_B1、Ｐ_A1はそれぞれ、５〜３０ｃＮ、特に５〜２５ｃＮであることが好ましい。 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

ずれ落ち防止及び弾性部材の押圧跡や肌への負担防止の観点、あるいは後述する効果の一又は二以上をより確実に得る観点から、背側対応部Ｂ４の１本あたりのＹ方向の収縮応力Ｑ_B4は、４〜２３ｃＮ、特に４〜２０ｃＮであることが好ましく、腹側延出部Ａ４の１本あたりのＹ方向の収縮応力Ｑ_A4は、４〜２３ｃＮ、特に４〜２０ｃＮであることが好ましい。 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.

おむつ１は、下記関係式（９）及び（１０）を満たしていることが好ましい。
Ｐ_A2＞Ｐ_A3,Ｐ_B2＞Ｐ_B3 ・・・（９）
Ｐ_A2＞Ｐ_A4,Ｐ_B2＞Ｐ_B4 ・・・（１０） 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)

関係式（９）は、Ｘ方向の単位長さ当たりのＹ方向の収縮応力については、腹側シート部材２Ａ及び背側シート部材２Ｂの何れについても、第３領域Ａ３，Ｂ３の収縮応力が、第２領域Ａ２，Ｂ２の収縮応力よりも小さいことを意味する。
関係式（１０）は、Ｘ方向の単位長さ当たりのＹ方向の収縮応力については、腹側延出部Ａ４及び背側対応部Ｂ４の収縮応力が、第２領域Ａ２，Ｂ２の収縮応力よりも小さいことを意味する。 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.

着用者の腸骨領域に当たり易い第２領域Ａ２、Ｂ２の単位長さ当たりの収縮応力を高め、ウエスト開口周縁部の第１領域の単位長さあたりの収縮応力を第２領域よりも低減させることで、ウエスト開口部の開口周縁部の下方へのずれ落ちを効果的に防止することができる。また、着用者の腸骨領域よりも下部に位置し、腸骨領域よりも体の断面形状が楕円に近く、他の領域よりも比較的ゴム跡のつきやすい、第３領域Ａ３，Ｂ３並びに腹側延出部Ａ４及び背側対応部Ｂ４の単位長さ当たりの収縮応力を、第２領域Ａ２、Ｂ２よりも弱くすることにより、これらの領域が、肌に強く当たり、ゴム跡が付いたり、肌への負担となるといったことを一層効果的に防止することができる。   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.

比（Ｐ_A2／Ｐ_A3）、比（Ｐ_B2＞Ｐ_B3）、比（Ｐ_A2＞Ｐ_A4）及び比（Ｐ_B2＞Ｐ_B4）は、それぞれ、１より大きく４以下であることが好ましく、より好ましくは１より大きく３．５以下、更に好ましくは１より大きく２．５以下である。
また、背側シート部材２Ｂ及び腹側シート部材２Ａのそれぞれにおいての第２領域Ｂ２，Ａ２のＸ方向の単位長さ当たりのＹ方向の収縮応力Ｐ_B2、Ｐ_A2はそれぞれ、１４〜５０ｃＮ、特に２０〜５０ｃＮであり、背側シート部材２Ｂ及び腹側シート部材２Ａのそれぞれにおいての第２領域Ｂ２，Ａ２の１本あたりのＹ方向の収縮応力Ｑ_B2、Ｑ_A2はそれぞれ、４〜２３ｃＮ、特に４〜２０ｃＮであることが、ウエスト開口部周縁部の下方へのずれ落ちを効果的に防止でき、腸骨周縁部に押圧跡を付けることも防止され、腸骨周縁部の肌への負担も防止する観点から、好ましい。 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.

腸骨領域とは、着用者の腸骨稜から上前腸骨棘にかけての部位であり、例えば、腸骨稜から上前腸骨棘にかけての部位については、特開２００６−６１６８０号公報に説明されている。
おむつ１を着用した状態で、第２領域Ａ２、Ｂ２が着用者の腸骨稜から上前腸骨棘にかけての部位に当接するようにするためには、展開且つ伸長状態のおむつ１において、第２領域Ａ２、Ｂ２の中心位置（おむつ１の長手方向における中心位置）とおむつの長手方向中心線ＣＬとの間の距離ｋ１及びｋ２（図２参照）が、幼児用おむつにおいては、それぞれ、１８０〜２３０ｍｍであることが好ましく、より好ましくは１８５〜２２０ｍｍであり、更に好ましくは１９５〜２１５ｍｍである。成人用のおむつの場合には、距離ｋ１及びｋ２（図２参照）が３００〜３５０ｍｍ、特に３０５〜３３５ｍｍであることが好ましい。 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.

また、おむつ１は、下記関係式（１２）〜（１５）を満たしていることが好ましい。
比（Ｐ_A2／Ｐ_A3）＞比（Ｑ_A2／Ｑ_A3），比（Ｐ_A2／Ｐ_A3）＞１ ・・・（１２）
比（Ｐ_B2／Ｐ_B3）＞比（Ｑ_B2／Ｑ_B3），比（Ｐ_B2／Ｐ_B3）＞１ ・・・（１３）
比（Ｐ_A2／Ｐ_A4）＞比（Ｑ_A2／Ｑ_A4），比（Ｐ_A2／Ｐ_A4）＞１ ・・・（１４）
比（Ｐ_B2／Ｐ_B4）＞比（Ｑ_B2／Ｑ_B4），比（Ｐ_B2／Ｐ_B4）＞１ ・・・（１５） 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)

第２領域は腸骨領域に相当し、おむつのウエスト開口部周縁部からのずれの防止には、第１領域の収縮応力を低減し、第２領域の収縮応力を高めることが有効である。特に、ウエスト開口部周縁部は立ち座り等の動作によって周長の変動が大きい部分であり、サイドシール下端部周縁部と同様またはそれ以上に動作によるおむつのズレが発生しやすい。関係式（１２）〜（１５）を満たし、且つ（１）〜（４）の関係式を満たすことで、おむつのお腹からのズレとサイドシール下端部周縁部のズレの両方を防止することができ、且つ胴周り領域と同様に腸骨領域についても単位本数あたりの応力を低減することで、お腹周り全域に亘ってゴム跡を低減することができる。これらの観点から、比（Ｑ_A2／Ｑ_A3）、比（Ｑ_B2／Ｑ_B3）、比（Ｑ_A2／Ｑ_A4）、比（Ｑ_B2／Ｑ_B4）は１であってもよい。 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.

なお、弾性部材２４の１本当たりのＹ方向の収縮応力が同じである場合には、前述した通り、完全に同一の場合の他、両者の１本当たりのＹ方向の収縮応力の差の絶対値が２．５ｃＮ以下である場合も含まれる。   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.

また、おむつ１は、延出部下部Ｂ５のＸ方向の単位長さ当たりのＹ方向の収縮応力をＰ_B5、弾性部材１本当たりのＹ方向の収縮応力をＱ_B5としたときに、下記関係式（１１）を満たしている。
比（Ｐ_B4／Ｐ_B5）＞比（Ｑ_B4／Ｑ_B5），比（Ｐ_B4／Ｐ_B5）＞１ ・・・（１１）
関係式（１１）は、Ｘ方向の単位長さあたりのＹ方向の収縮応力は背側対応部Ｂ４よりも延出部下部Ｂ５のほうが小さく、１本あたりのＹ方向の収縮応力の背側対応部Ｂ４と延出部下部Ｂ５の差は、Ｘ方向の単位長さあたりの収縮応力の背側対応部Ｂ４と延出部下部Ｂ５の差よりも小さく、１本あたりのＹ方向の収縮応力の背側対応部Ｂ４と延出部下部Ｂ５の差はそれほど大きくないことを意味する。Ｘ方向の単位長さあたりのＹ方向の収縮応力が背側対応部Ｂ４よりも延出部下部Ｂ５のほうが小さいことで、特に臀部の湾曲が大きい臀部の下側において、延出部全域が臀部に沿うようにフィットしやすくなる。更に、延出部下部Ｂ５の収縮応力が小さいことで、延出部下部Ｂ５の収縮した場合のＹ方向の幅が大きくなり、その結果臀部を覆う面積が大きくなることで、おむつからの臀部のはみ出しを防止し、漏れへの不安感や違和感を低減できる。延出部が収縮した場合のＹ方向の幅が大きくなる効果については、延出部下部Ｂ５の弾性部材を固定する際の伸長率を、背側対応部Ｂ４の弾性部材を固定する際の伸長率よりも小さくすることで、より一層臀部のはみ出しを防止する効果が得られる。また、１本あたりの収縮応力の差を、単位長さあたりの収縮応力の差よりも小さくすることは、ゴム跡のつきやすい背側対応部Ｂ４における弾性部材の押圧跡を、単位長さあたりの収縮応力が小さく、１本あたりの収縮応力の小さく、ゴム跡がつきにくい構成になっている延出部下部に近づけることで、背側対応部Ｂ４のゴム跡を防止でき、延出部全域において、ゴム跡を防止できることを意味する。これらの観点から、比（Ｑ_B4／Ｑ_B5）は１であってもよい。 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.

延出部下部Ｂ５の収縮応力Ｐ_B5を、背側対応部Ｂ４の同収縮応力Ｐ_B4より小さくする方法としては、背側対応部Ｂ４の、弾性部材の物品長手方向の配置ピッチが、前記延出部下部Ｂ５の、弾性部材の物品長手方向の配置ピッチよりも大きくすることが好ましい。これは、配置ピッチを大きくすることで前述の収縮応力を低下させることによって得られる効果に加え、延出部下部の弾性部材を含んだシート部材のＸ方向の曲げ剛性を低下させることができ、特に湾曲の大きい臀部の下部領域におけるフィット性が向上する点から好ましい。配置ピッチは、個々の弾性部材のＸ方向の中心位置間の距離である。 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.

また、背側本体部の第１領域Ｂ１は、弾性部材の物品長手方向の配置ピッチが、延出部下部Ｂ５の、弾性部材の物品長手方向の配置ピッチと等しいことが、臀部同様にくびれや湾曲の大きいお腹周り周縁部への沿いやすさや、弾性部材を含むシート部材の剛性がやわらかくフィット性に優れ違和感が少ない点から好ましい。
配置ピッチが等しい場合には、配置ピッチが、完全に同一の場合の他、両者の配置ピッチの差の絶対値が２ｍｍ以下の場合も含まれる。 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.

腹側シート部材２Ａ及び背側シート部材２Ｂにおける一の領域と他の一の領域とでＸ方向の単位長さ当たりのＹ方向の収縮応力を異ならせる方法としては、例えば、（１）収縮応力が高い領域と収縮応力が低い領域とで、シート２２及び又は２３に固定する際の弾性部材の伸長率を異ならせる方法、（２）収縮応力が高い領域と収縮応力が低い領域とで、配する弾性部材の太さを異ならせる方法、（３）収縮応力が高い領域と収縮応力が低い領域とで、配する弾性部材の材質を異ならせる方法、（４）収縮応力が高い領域と収縮応力が低い領域とで、弾性部材の配置ピッチを異ならせる方法、及び（５）これらの２以上を組み合わせた方法等が挙げられる。   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.

腹側シート部材２Ａ及び背側シート部材２Ｂにおける一の領域と他の一の領域とで、弾性部材１本当たりのＹ方向の収縮応力を異ならせる方法としては、例えば、（１）収縮応力が高い領域と収縮応力が低い領域とで、シート２２及び又は２３に固定する際の弾性部材の伸長率を異ならせる方法、（２）収縮応力が高い領域と収縮応力が低い領域とで、配する弾性部材の太さを異ならせる方法、（３）収縮応力が高い領域と収縮応力が低い領域とで、配する弾性部材の材質を異ならせる方法、（４）収縮応力が高い領域と収縮応力が低い領域とで、弾性部材の配置ピッチを異ならせる方法、及び（５）これらの２以上を組み合わせた方法等が挙げられる。   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.

本実施形態のおむつ１は、腹側シート部材２Ａ及び背側シート部材２Ｂのそれぞれの本体部２０ａ，２０ｂに、ウエスト伸縮部Ｇ１及び胴回り伸縮部Ｇ２を有している。また、腹側シート部材２Ａ及び背側シート部材２Ｂのそれぞれの延出部４Ａ，２１ｂに、延出部伸縮部Ｇ３を有している。
そして、腹側シート部材２Ａ及び背側シート部材２Ｂの伸縮部Ｇ１〜Ｇ３の何れにおいても、外層シート２２と内層シート２３との間が、散点状に形成された多数の融着部（接合部）２６において接合されており、弾性部材２４が、それらの融着部２６を通らないように配されている。 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.

より具体的には、伸縮部Ｇ１〜Ｇ３には、おむつ１の長手方向（Ｘ方向）に接合部２６が間欠的に直列配置されてなる接合部列が、おむつ１の幅方向（Ｙ方向）に複数列形成されており、それらの接合部列における各接合部のＸ方向が一致している。
そして、腹側シート部材２Ａ及び背側シート部材２Ｂの伸縮部Ｇ１〜Ｇ３の何れにおいても、複数本の弾性部材２４が、それぞれ、Ｘ方向において隣り合う接合部２６間を通るように配されている。また、各弾性部材２４は、後述する側部接着領域２７又は吸収性本体側接着領域２８においてシート２２，２３間に固定されている一方、それ以外の部位においては、シート２２，２３の何れにも固定されていない。 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.

腹側シート部材２Ａは、図３に示すように、腹側シート部材の両側縁部２ａ，２ａ又はその近傍に、外層シート２２と内層シート２３との間が接着剤を介して接合された側部接着領域２７を有している。また、腹側シート部材２Ａは、側部接着領域２７よりおむつ幅方向中央側に、外層シート２２と内層シート２３との間が接着剤を介して接合された吸収性本体側接着領域２８を有している。
背側シート部材２Ｂは、図４に示すように、背側シート部材の両側縁部２ｂ，２ｂ又はその近傍に、外層シート２２と内層シート２３との間が接着剤を介して接合された側部接着領域２７を有している。また、背側シート部材２Ｂも、側部接着領域２７よりおむつ幅方向中央側に、外層シート２２と内層シート２３との間が接着剤を介して接合された吸収性本体側接着領域２８を有している。 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.

そして、腹側シート部材２Ａ及び背側シート部材２Ｂの何れにおいても、ウエスト伸縮部Ｇ１に配された弾性部材２４は、一対の側部接着領域２７それぞれにおいてシート２２，２３間に固定されている一方、側部接着領域２７間においては、シート２２，２３の何れにも固定されていない。
他方、腹側シート部材２Ａ及び背側シート部材２Ｂの何れにおいても、胴回り伸縮部Ｇ２及び延出部伸縮部Ｇ３に配された弾性部材２４は、側部接着領域２７及び吸収性本体側接着領域２８のそれぞれにおいてシート２２，２３間に固定されている一方、側部接着領域２７と吸収性本体側接着領域２８との間においては、シート２２，２３の何れにも固定されていない。 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.

吸収性本体側接着領域２８は、図３及び図４に示すように、おむつ幅方向外側の端が、吸収性本体３の側縁３ｃの位置よりおむつ幅方向の内側（中央側）に位置するように形成されているが、これに代えて、吸収性本体３の側縁３ｃの内外に亘るように形成したり、吸収性本体３の側縁３ｃよりおむつ幅方向の外方に形成することもできる。   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.

腹側シート部材２Ａ及び背側シート部材２Ｂそれぞれのウエスト伸縮部Ｇ１，胴回り伸縮部Ｇ２及び延出部伸縮部Ｇ３においては、弾性部材２４が収縮することにより、隣接する接合部列間のシート２２及び２３が外方に膨らむように変形して、隣接する接合部列間にシート２２又はシート２３からなる襞２９が生じると共に、両シート２２，２３間には、襞２９と襞２９とに周囲を囲まれた中空部３０が形成される（図５参照）。襞２９や中空部３０が形成されることにより、腹側シート部材２Ａ及び背側シート部材２Ｂの柔らかさが向上して肌触り等が向上する他、肌当接面側に形成される襞２９間を空気が流通し易くムレ防止性にも優れている。特に、内層シート２３を、不織布等の通気性シートで形成した場合等においては、おむつ１内の湿気を外部に一層逃がしやすくなる。   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.

他方、本実施形態のおむつ１においては、図３及び図４に示すように、腹側シート部材２Ａ及び背側シート部材２Ｂそれぞれにおける、本体部２０ａ，２０ｂと延出部４Ａ，２１ｂとの境界領域に、側部接着領域２７の幅（Ｙ方向の長さ）が他の部分より広い部分を有している。
より具体的には、背側シート部材２Ｂについては、第３領域Ｂ３及び背側対応部Ｂ４における側部接着領域２７の幅Ｗ１が、第１領域Ｂ１，第２領域Ｂ２及び延出部下部Ｂ５における側部接着領域２７の幅Ｗ２より広くなっており、腹側シート部材２Ａについては、第３領域Ａ３の下半部及び腹側延出部Ａ４における側部接着領域２７の幅Ｗ１が、第１領域Ａ１，第２領域Ａ２における側部接着領域２７の幅Ｗ２より広くなっている。 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.

サイドシール部４の下端付近においては、先に述べたように、特に排尿時において応力が高くなりやすく、また着用者の肌の曲率等との関係により、肌にゴム跡が付きやすい。本体部２０ａ，２０ｂと延出部４Ａ，２１ｂとの境界領域、特に背側シート部材の第３領域Ｂ３及び背側対応部Ｂ４、及び／又は腹側シート部材の対応する領域に、側部接着領域２７の幅が大きい部分を設けることで、当該部分は、襞２９が形成された部分に比して平滑に維持され、肌に対する接触面積が増大するため、弾性部材による肌に対する圧力を分散させ、ゴム跡が肌に付くことを防止しつつずり落ち防止性を向上させることができる。おむつを展開した際の左右のＷ２の幅の合計は、展開した際の腹側（または背側）シート部材の幅の１０〜６５％が好ましく、特に１５〜６０％が好ましい。更に、Ｗ２の幅は、Ｗ１の幅の１．２〜１０．０倍が好ましく、特に４．０〜７．５倍が先述の効果を得る上で好ましい。   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.

腹側延出部４Ａの長さＬ５（図２参照）は、腹側シート部材２Ａの長さＬａ（図２参照）の５〜６０％、特に２０〜４０％であることが好ましく、背側延出部２１ｂの長さＬ６（図２参照）は、背側シート部材２Ｂの長さＬｂ（図２参照）の５〜６０％、特に２０〜４０％であることが好ましい。また、幼児用のおむつの場合、腹側及び背側延出部４Ａ，２１ｂそれぞれの長さＬ５，Ｌ６は、１０〜１５０ｍｍであることが好ましく、より好ましくは２０〜１００ｍｍである。成人用のおむつの場合、腹側及び背側延出部４Ａ，２１ｂそれぞれの長さＬ５，Ｌ６は、１０〜２００ｍｍであることが好ましく、より好ましくは２０〜１５０ｍｍである。   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.

また、背側延出部２１ｂの長さＬ６は、腹側延出部４Ａの長さＬ５より長い（Ｌ６＞Ｌ５）ことが、腹側延出部４Ａと背側延出部２１ｂとの間の隙間が、サイドシール部の剥離やシートの裂けによって生じたような印象を与えないようにする観点から好ましい。但し、背側延出部２１ｂの長さＬ６は、腹側延出部４Ａの長さＬ５の１．２〜１０倍、特に１．５〜６．５倍であることが、くびれや湾曲を有する体型へのフィット性やお尻のはみだし防止などの装着外観向上、装着時の違和感改善の点から好ましい。
腹側延出部４Ａ及び背側延出部２１ｂの長さＬ５，Ｌ６は、何れもおむつ長手方向（Ｘ方向）の長さである。 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).

なお、上述した実施形態のおむつ１における、外層シート２２及び内層シート２３は、ウエスト開口部の開口周縁端をなす端縁部２ｃにおいて内層シート２３側に折り返された延出折り返し部２２ａ，２３ａを有しており、延出折り返し部２２ａ，２３ａは、サイドシール部４において、外層シート２２及び内層シート２３の折り返されていない部分と接合されていると共に、吸収性本体３の長手方向と重なる部分が、接着剤により該吸収性本体３の表面シート３１側の面に接合されている。   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.

外層シート２２及び内層シート２３としては、この種の物品に従来使用されている各種のシート材を特に制限なく用いることができるが、不織布であることが好ましく、特に柔軟性等の観点から、エアースルー不織布、ヒートロール不織布、スパンレース不織布、スパンボンド不織布、メルトブローン不織布等からなる単層の不織布又は２層以上の積層不織布であることが好ましい。また、これらの不織布とフィルムとを一体化したシートでもよい。弾性部材２４の形成材料としては、使い捨ておむつや生理用ナプキン等の吸収性物品に用いられる各種公知の弾性材料を特に制限なく用いることができる。弾性材料としては、例えば、スチレン−ブタジエン、ブタジエン、イソプレン、ネオプレン等の合成ゴム、天然ゴム、ＥＶＡ、伸縮性ポリオレフィン、ポリウレタン等を挙げることができる。弾性部材の形態としては、断面が矩形、正方形、円形、多角形状等の糸状（糸ゴム等）若しくは紐状（平ゴム等）のもの、又はマルチフィラメントタイプの糸状のもの等を好ましく用いることができる。   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.

上述したおむつ１は、例えば、腹側シート部材２Ａの帯状原反と背側シート部材２Ｂの帯状原反とを離間させて搬送しつつ、吸収性本体３を、両者間に架け渡すように間欠的に固定し、次いで、腹側シート部材２Ａの帯状原反と背側シート部材２Ｂの帯状原反とが重なるように二つ折りした後、サイドシール部４を形成するための熱シール等（接合）を行い、その接合と同時又はその後に切断して個々の使い捨ておむつに分割することにより効率的に製造することができる。この方法によれば、レッグ開口部形成用の貫通孔や切り欠きを形成する場合に比して、外包材の原反からのトリムの除去を不要としたり、除去すべきトリムの小型化等を図ることができる。特に腹側シート部材２Ａ及び背側シート部材２Ｂの帯状原反を流れ方向と直交する直線で切断したものが、完成したおむつ１の腹側シート部材２Ａ及び背側シート部材２Ｂとなるようにすることがトリムの除去を不要とできるため好ましい。   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.

以上、本発明をその好ましい実施形態に基づき説明したが、本発明は上述した実施形態に制限されず適宜変更可能である。
例えば、腹側シート部材２Ａと背側シート部材２Ｂは、それぞれ、弾性部材２４と重ならないように形成されたドット状の接合部２６を有するものに代えて、おむつ外面をなす外層シート２２とその内側に配された内層シート２３とが全域において接着された構造を有するものであっても良い。また、ウエスト伸縮部Ｇ１、胴回り伸縮部Ｇ２、延出部伸縮部Ｇ３は、それぞれ、その全体又は一部が、おむつ外面をなす外層シート２２とその内側に配された内層シート２３とが全域において接着された構造を有するものであっても良い。 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.

また、胴回り伸縮部Ｇ２を、腹側シート部材２Ａ及び／又は背側シート部材２Ｂの全幅に亘るように形成しても良く、延出部伸縮部Ｇ３も、腹側シート部材２Ａ及び／又は背側シート部材２Ｂの全幅に亘るように形成しても良い。   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.

また、サイドシール部４は、腹側及び背側シート部材の側縁部２ａ，２ｂを接合して形成されているが、サイドシール部４の外側に腹側シート部材２Ａと背側シート部材２Ｂとが接合されていない細幅（例えば０ｍｍ超２０ｍｍ以下）の非接合部分を有していてもよい。   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).

また、パンツ型吸収性物品は、幼児又は成人用のパンツ型使い捨ておむつの他、パンツ型の生理用ナプキン等であっても良い。
上述した一の実施形態における説明省略部分及び一の実施形態のみが有する要件は、それぞれ他の実施形態に適宜適用することができ、また、各実施形態における要件は、適宜、実施形態間で相互に置換可能である。 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.

以下、本発明を実施例により詳細に説明する。しかし、本発明は、下記により何ら制限されるものではない。   Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited by the following.

〔実施例１及び比較例１〕
腹側シート部材及び背側シート部材に表１に示す弾性部材を表１に示す態様で配して、各部が表１に示す収縮応力を有する図１〜図４に示す概略形態のパンツ型使い捨ておむつを製造した。弾性部材は、何れも、スパンデックスの糸状弾性体を用いた。
なお、表１中の「↑」は、上に同じである旨を示す。また、実施例１のおむつにおける、腹側延出部Ａ４のＸ方向の長さＬ５は、背側延出部２１ｂのＸ方向の長さＬ６の１／２の長さとした。また、比較例１も同様とした。 [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.

実施例１及び比較例１における、各収縮応力の比を表２に示す。   Table 2 shows the ratio of each shrinkage stress in Example 1 and Comparative Example 1.

〔評価〕
得られたパンツ型使い捨ておむつについて、下記の方法により、（１）ずり落ち難さ、（２）足周りのゴム跡の付き難さについて評価し、結果を表３に示した。 [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）ずり落ち難さ
実施例１及び比較例１のおむつを、１〜２才児相当のベビー動的モデルに装着させ、２４０ｇ（起床時想定）の擬似尿を注入し、３０分動作させた後の足周りのズレ落ち量を比較した。足周りのずれ落ち量は、そけいと耳珠垂線の交点（そけいサイド点）からオムツのサイドシール下端までの長さを足周りずれ落ち量として測定した。
（評価基準）
○：足周りずれ落ち量が２０ｍｍ未満
△：足周りずれ落ち量が２０ｍｍ以上３０ｍｍ未満
×：足周りずれ落ち量が３０ｍｍ以上 (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）足周りのゴム跡の付き難さ
実施例１及び比較例１のおむつを、１〜２才児に４〜１０時間装着（通常通り使用）してもらい、ゴム跡の様子を観察した。
（評価基準）
◎：殆どゴムの跡が見えないレベル
○：ゴムの跡があっても気にならないレベル
×：ゴムの跡がくっきり付いており、気になるレベル (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

表３に示す結果から、本発明に係る実施例のおむつは、外包材が腹側シート部材と背側シート部材とに分割されたパンツ型吸収性物品でありながら、ずれ落ち防止性に優れ、弾性部材の押圧跡が肌に付きにくく、肌への負担が少ないことが判る。   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 パンツ型使い捨ておむつ（パンツ型吸収性物品）
２Ａ 腹側シート部材
２ａ，２ａ 側縁部
２０ａ 腹側本体部
Ａ１ 第１領域
Ａ２ 第２領域
Ａ３ 第３領域
Ａ４ 腹側延出部
２Ｂ 背側シート部材
２ｂ，２ｂ 側縁部
２０ｂ 背側本体部
Ｂ１ 第１領域
Ｂ２ 第２領域
Ｂ３ 第３領域
２１ｂ 背側延出部
Ｂ４ 背側対応部（背側延出部における腹側延出部に対応する部分）
Ｂ５ 延出部下部
２２ 外層シート
２３ 内層シート
２４ 弾性部材
２９ 襞
３ 吸収性本体
３１ 表面シート
３２ 裏面シート
３３ 吸収体
３４ 側方カフス
４ サイドシール部
５ ウエスト開口部
６ レッグ開口部
Ａ 腹側部
Ｂ 背側部
Ｃ 股下部
Ｇ１ ウエスト伸縮部
Ｇ２ 胴回り伸縮部
Ｇ３ 延出部伸縮部 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)

着用者の腹側に配される矩形状の腹側シート部材と、着用者の背側に配される矩形状の背側シート部材と、腹側シート部材及び背側シート部材に架け渡して固定された吸収性本体とを具備し、ウエスト開口部及び一対のレッグ開口部を有するパンツ型吸収性物品であって、
腹側シート部材及び背側シート部材は、左右両側にサイドシール部を有する腹側及び背側本体部と、該腹側及び背側本体部から股下部側に延出し、左右両側にサイドシール部を有しない腹側及び背側延出部とを有しており、背側延出部は、物品長手方向の長さが、腹側延出部と同じかそれよりも長く、
腹側本体部及び腹側延出部並びに背側本体部及び背側延出部の腹側延出部に対応する背側対応部は、何れも、物品幅方向に配された弾性部材により物品幅方向に伸縮性を有しており、
腹側本体部を、前記サイドシール部を物品長手方向に３等分して３領域に区分し、ウエスト開口部に近い側から順に第１領域Ａ１、第２領域Ａ２及び第３領域Ａ３とし、腹側シート部材における第１〜第３領域Ａ１〜Ａ３及び腹側延出部Ａ４の、物品長手方向の単位長さ当たりの物品幅方向の収縮応力をＰ_A1〜Ｐ_A4、弾性部材１本当たりの物品幅方向の収縮応力をＱ_A1〜Ｑ_A4とすると共に、
背側本体部を、前記サイドシール部を物品長手方向に３等分して３領域に区分し、ウエスト開口部に近い側から順に第１領域Ｂ１、第２領域Ｂ２及び第３領域Ｂ３とし、背側シート部材における第１〜第３領域Ｂ１〜Ｂ３及び背側対応部Ｂ４の、物品長手方向の単位長さ当たりの物品幅方向の収縮応力をＰ_B1〜Ｐ_B4、弾性部材１本当たりの物品幅方向の収縮応力をＱ_B1〜Ｑ_B4としたときに、
下記関係式（１）〜（４）を満たすパンツ型吸収性物品。
比（Ｐ_A3／Ｐ_A1）＞比（Ｑ_A3／Ｑ_A1），比（Ｐ_A3／Ｐ_A1）＞１ ・・・（１）
比（Ｐ_B3／Ｐ_B1）＞比（Ｑ_B3／Ｑ_B1），比（Ｐ_B3／Ｐ_B1）＞１ ・・・（２）
比（Ｐ_A4／Ｐ_A1）＞比（Ｑ_A4／Ｑ_A1），比（Ｐ_A4／Ｐ_A1）＞１ ・・・（３）
比（Ｐ_B4／Ｐ_B1）＞比（Ｑ_B4／Ｑ_B1），比（Ｐ_B4／Ｐ_B1）＞１ ・・・（４） 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) 下記関係式（５）及び（６）を満たす請求項１記載のパンツ型吸収性物品。
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, 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) 下記関係式（７）及び（８）を満たす請求項１又は２記載のパンツ型吸収性物品。
４ｃＮ＜Ｑ_A3＜２３ｃＮ ・・・（７）
４ｃＮ＜Ｑ_B3＜２３ｃＮ ・・・（８） 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) 下記関係式（９）及び（１０）を満たす請求項１〜３の何れか１項記載のパンツ型吸収性物品。
Ｐ_A2＞Ｐ_A3,Ｐ_B2＞Ｐ_B3 ・・・（９）
Ｐ_A2＞Ｐ_A4,Ｐ_B2＞Ｐ_B4 ・・・（１０） 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) 前記背側延出部は、前記背側対応部より更に股下部側に延出する延出部下部Ｂ５を有し、該延出部下部は、物品幅方向に配された弾性部材により物品幅方向に伸縮性を有しており、該延出部下部の物品長手方向の単位長さ当たりの物品幅方向の収縮応力をＰ_B5、弾性部材１本当たりの物品幅方向の収縮応力をＱ_B5としたときに、下記関係式（１１）を満たす請求項１〜４の何れか１項記載のパンツ型吸収性物品。
比（Ｐ_B4／Ｐ_B5）＞比（Ｑ_B4／Ｑ_B5），比（Ｐ_B4／Ｐ_B5）＞１ ・・・（１１） 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) 前記腹側シート部材における第２〜第３領域Ａ２〜Ａ３及び腹側延出部Ａ４の、弾性部材の物品長手方向の配置ピッチが、前記腹側シート部材における第１領域Ａ１の、弾性部材の物品長手方向の配置ピッチよりも小さい、請求項１〜５の何れか１項記載のパンツ型吸収性物品。   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. 前記背側シート部材における第２〜第３領域Ｂ２〜Ｂ３及び背側対応部Ｂ４の、弾性部材の物品長手方向の配置ピッチが、前記背側シート部材における第１領域Ｂ１の、弾性部材の物品長手方向の配置ピッチよりも小さい、請求項１〜６の何れか１項記載のパンツ型吸収性物品。   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. 前記背側延出部は、前記背側対応部より更に股下部側に延出する延出部下部Ｂ５を有し、該背側対応部及び該延出部下部は、何れも、物品幅方向に配された複数本の弾性部材により物品幅方向に伸縮性を有しており、
前記背側対応部の、弾性部材の物品長手方向の配置ピッチが、前記延出部下部の、弾性部材の物品長手方向の配置ピッチよりも大きい、請求項１〜７の何れか１項記載のパンツ型吸収性物品。 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. 前記背側延出部は、前記背側対応部より更に股下部側に延出する延出部下部Ｂ５を有し、前記背側本体部の第１領域及び該延出部下部は、何れも、物品幅方向に配された複数本の弾性部材により物品幅方向に伸縮性を有しており、
前記延出部下部の、弾性部材の物品長手方向の配置ピッチが、前記背側本体部の第１領域の、弾性部材の物品長手方向の配置ピッチと等しい、請求項１〜８の何れか１項記載のパンツ型吸収性物品。 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. 腹側シート部材及び背側シート部材それぞれの前記本体部及び前記延出部に、２枚のシート間が散点状に形成された多数の接合部で互いに接合されていると共に弾性部材が、それぞれ物品長手方向に隣り合う接合部間を通るように配されている伸縮部を有している、請求項１〜９の何れか１項記載のパンツ型吸収性物品。   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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