JP2013132538A - Pants-type disposable diaper - Google Patents
Pants-type disposable diaper Download PDFInfo
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- JP2013132538A JP2013132538A JP2011286902A JP2011286902A JP2013132538A JP 2013132538 A JP2013132538 A JP 2013132538A JP 2011286902 A JP2011286902 A JP 2011286902A JP 2011286902 A JP2011286902 A JP 2011286902A JP 2013132538 A JP2013132538 A JP 2013132538A
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Abstract
Description
本発明は、フィット性、薄さ及び柔軟性を兼ね備えた外装シートを有するパンツタイプ使い捨ておむつに関する。 The present invention relates to a pants-type disposable diaper having an exterior sheet having both fit, thinness and flexibility.
パンツタイプ使い捨ておむつは、前身頃及び後身頃を有する外装シートと、この外装シートの内面に固定された、吸収体を含む内装体とを備え、前記外装シートの前身頃と後身頃とが両側部において接合されることにより、ウエスト開口部及び左右一対のレッグ開口部が形成されているものである。 The pants-type disposable diaper includes an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. Are joined together to form a waist opening and a pair of left and right leg openings.
パンツタイプ使い捨ておむつにおいては、身体へのフィット性を向上させるために、外装シートに、種々の弾性部材を伸長状態で固定することが行われており（例えば特許文献１〜９参照）、中でも、ウエスト部弾性部材、腰回り弾性部材及び湾曲弾性部材を備えているもの（特許文献６記載に代表される）は、比較的に身体に対するフィット性が高いものとなっている。ここに、ウエスト部弾性部材は、ウエスト開口部の縁部に、縦方向に間隔を空けて幅方向に沿って複数本平行に配置されているものである。また、腰回り弾性部材は、ウエスト部弾性部材よりも前後方向中央部側の領域に、縦方向に間隔を空けて幅方向に沿って配置されているものである。さらに、湾曲弾性部材は、前身頃及び後身頃の少なくとも一方の両側部から、幅方向中央に向かうにつれて反対の身頃側へ向かうように湾曲しつつ延在するものである。 In the pants-type disposable diaper, in order to improve the fit to the body, fixing various elastic members to the exterior sheet in an expanded state (for example, see Patent Documents 1 to 9), The one provided with the waist elastic member, the waist elastic member, and the curved elastic member (represented in Patent Document 6) has a relatively high fit to the body. Here, a plurality of waist elastic members are arranged in parallel along the width direction at intervals in the vertical direction at the edge of the waist opening. Further, the waist elastic member is disposed along the width direction with a space in the vertical direction in a region closer to the center in the front-rear direction than the waist elastic member. Furthermore, the curved elastic member extends while curving from both side portions of at least one of the front body and the back body so as to go to the opposite body side toward the center in the width direction.
しかしながら、従来の一般的なパンツタイプ使い捨ておむつにおいては、普通の下着と違って股間部がモコモコするという問題点があった。そして、本発明者らの研究によれば、この問題点の原因の一つは、臀裂から股間にかけての部分において吸収体が身体から浮くこと、つまり当該部位におけるフィット性が不十分であることであった。 However, in the conventional general pants-type disposable diapers, there is a problem that the crotch part is mokomoko unlike ordinary underwear. And according to the study by the present inventors, one of the causes of this problem is that the absorbent body floats from the body in the part from the rupture to the crotch, that is, the fit at the part is insufficient. Met.
この問題点に対して、臀裂のフィット性を改善するものとしては、背側の湾曲弾性部材を股間横断部においてウエスト開口部側に凸状に突出する配置としたもの等、種々の形態が提案されている（例えば、特許文献１０，１１参照）が、おむつ内面は臀裂にフィットする形状となるものの、フィットした状態に維持され難く、臀裂から股間にかけてのフィット性が不十分となり易いという問題点があった。 In order to improve the fit of the crack, there are various forms such as an arrangement in which the curved elastic member on the back side protrudes convexly toward the waist opening at the crotch crossing part. Although proposed (for example, refer to Patent Documents 10 and 11), the inner surface of the diaper has a shape that fits the rupture, but it is difficult to maintain the diaper fit, and the fit from the rupture to the crotch tends to be insufficient. There was a problem.
そこで本発明の主たる課題は、臀裂から股間にかけてのフィット性を改善し、装着時に股間部がモコモコし難い、パンツタイプ使い捨ておむつを提供することにある。 Then, the main subject of this invention is providing the underpants type disposable diaper which improves the fitting property from a rupture to a crotch, and a crotch part is hard to mokomoko at the time of mounting | wearing.
上記課題を解決した本発明は次のとおりである。
＜請求項１記載の発明＞
前身頃及び後身頃を形成する外装シートと、この外装シートの内面に固定された、吸収体を含む内装体とを備え、前記前身頃における外装シートの両側部と後身頃における外装シートの両側部とがそれぞれ接合されてサイドシール部が形成されることにより、ウエスト開口部及び左右一対のレッグ開口部が形成された、パンツタイプ使い捨ておむつにおいて、
前身頃の右のサイドシール部から前身頃の右のレッグ開口部に沿って股間部における右側部に至り、股間部における右側部から更に幅方向中央側に向かいつつ後側に向かうように湾曲して後身頃の幅方向中央部に位置する臀裂対向部に至り、臀裂対向部において前側に折り返され、更に左側に向かいつつ前側に向かうように湾曲して股間部の左側部に至り、股間部における左側部から前身頃の左のレッグ開口部に沿って前身頃の左のサイドシール部に至る；細長状の腹側湾曲弾性部材が、その長手方向に所定の伸長率で伸長された状態で固定されており、
前記後身頃における臀裂対向部に、幅方向に収縮して装着者の臀裂に入り込むように折れ曲がる屈曲フィット部が設けられるとともに、
前記腹側湾曲弾性部材によって、少なくとも前身頃から後身頃の臀裂対向部の側方までの左右のレッグ開口部に沿う部分に収縮力が作用するように構成されている、
ことを特徴とするパンツタイプ使い捨ておむつ。
The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior sheet that forms a front body and a back body, and an interior body including an absorbent body that is fixed to an inner surface of the exterior sheet, and both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body In the pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by forming a side seal part by joining each of
From the right side seal part of the front body to the right leg part of the crotch part along the right leg opening part of the front body, it curves so as to go to the rear side while going further from the right side part of the crotch part toward the center in the width direction. To the crack facing part located in the center of the rear body in the width direction, folded back to the front side at the crack facing part, and further curved toward the front side toward the left side to reach the left side part of the crotch part. From the left side of the front part to the left side seal part of the front body along the left leg opening of the front body; the elongated ventral curved elastic member is stretched at a predetermined elongation rate in the longitudinal direction It is fixed with
A bending fit portion that is bent so as to contract in the width direction and enter the wearer's crack is provided at the crack facing portion in the back body,
The ventral curved elastic member is configured such that a contractile force acts on a portion along the left and right leg openings from at least the front body to the side of the crack facing portion of the back body,
A pants-type disposable diaper characterized by that.
（作用効果）
このように臀裂対向部を幅方向に伸縮させることにより、臀裂対向部が峰状に隆起して臀裂に入り込む立体形状の屈曲フィット部となり、さらにこの屈曲フィット部から股間部にかけての部分は、腹側湾曲弾性部材によって、少なくとも前身頃から後身頃の臀裂対向部の側方までの左右のレッグ開口部に沿う部分に収縮力が作用する結果、鼠蹊部に沿ってウエスト側に引っ張られ（以下、腹側への引張作用ともいう）、臀裂から股間にかけてフィットするようになる。よって、本発明によれば、臀裂から股間にかけて良好にフィットするとともに、装着時に股間部がモコモコし難くなる。また、もちろん、このような腹側湾曲弾性部材は鼠蹊部に対するフィット性を向上させる機能も発揮する。
(Function and effect)
By expanding and contracting the crack facing portion in the width direction in this way, the crack facing portion rises in a peak shape and becomes a three-dimensional bent fitting portion that enters the crack, and further, a portion from this bending fitting portion to the crotch portion As a result of the contraction force acting on the left and right leg openings at least from the front body to the side of the rupture facing part of the back body by the ventral curved elastic member, it is pulled toward the waist side along the buttocks (Hereinafter, also referred to as a tension action on the ventral side), and fits from the cleft to the crotch. Therefore, according to this invention, while fitting well from a crack to a crotch, a crotch part becomes difficult to mokomoko at the time of mounting | wearing. Of course, such a ventral curved elastic member also exhibits a function of improving fit to the buttocks.
＜請求項２記載の発明＞
後身頃の右のサイドシール部から後身頃の右のレッグ開口部に沿って前側に向かい、更に臀裂対向部を右から左へ幅方向に横切りつつ後向きに方向転換され、更に後身頃の左のレッグ開口部に沿って後身頃の左のサイドシール部に至る；細長状の背側湾曲弾性部材が、その長手方向に所定の伸長率で伸長された状態で固定されており、
この背側湾曲弾性部材によって、少なくとも後身頃における前記臀裂対向部の側方までの左右のレッグ開口部に沿う部分に収縮力が作用するように構成されており、かつ
前身頃における縦方向の弾性変形時引張応力が、後身頃における縦方向の弾性変形時引張応力よりも大きい、請求項１記載のパンツタイプ使い捨ておむつ。
<Invention of Claim 2>
From the right side seal part of the back body toward the front side along the right leg opening of the back body, and further to the left side of the back body, the direction opposite to the crack is crossed in the width direction from right to left. To the left side seal part of the back body along the leg opening of the body; an elongated dorsal curved elastic member is fixed in a state of being stretched at a predetermined elongation rate in the longitudinal direction;
By this dorsal curved elastic member, it is configured such that a contracting force acts on at least a portion along the left and right leg openings up to the side of the crack facing portion in the back body, and in the longitudinal direction in the front body The pants-type disposable diaper according to claim 1, wherein the tensile stress at the time of elastic deformation is larger than the tensile stress at the time of elastic deformation in the rear body.
（作用効果）
このような背側湾曲弾性部材を設けることにより、特に臀溝に対するフィット性を向上させることができる。また、このように、前身頃における縦方向の弾性変形時の引張応力を後身頃のそれよりも大きくすると、装着状態においては、後身頃の縦方向収縮力に抗する前身頃の縦方向収縮力によって、おむつの股間部から臀裂対向部にかけての部分が前側に移動しつつ持ち上がった状態で弾力的にバランスするため、前述した屈曲フィット部の臀裂へのフィット作用がより一層のものとなる。
(Function and effect)
By providing such a dorsal curved elastic member, it is possible to particularly improve the fit to the groin. In addition, if the tensile stress at the time of elastic deformation in the longitudinal direction in the front body is made larger than that in the back body, the longitudinal contraction force of the front body resists the longitudinal contraction force of the back body in the wearing state. Because of this, the part from the crotch part of the diaper to the part facing the crack is elastically balanced in the state of being lifted while moving to the front side. .
＜請求項３記載の発明＞
前記腹側湾曲弾性部材における前記臀裂対向部を通る部分、及び前記背側湾曲弾性部材における前記臀裂対向部を通る部分によって、前記臀裂対向部に収縮力が作用し、これにより前記屈曲フィット部が設けられている、請求項２記載のパンツタイプ使い捨ておむつ。
<Invention of Claim 3>
A contraction force acts on the crack facing portion by a portion passing through the crack facing portion in the ventral curved elastic member and a portion passing through the crack facing portion in the dorsal curved elastic member. The pants-type disposable diaper according to claim 2, wherein the fitting part is provided.
（作用効果）
屈曲フィット部は、腹側湾曲弾性部材や背側弾性伸縮部材とは別の専用の弾性部材を臀裂対向部に設けることによっても形成することができるが、腹側湾曲弾性部材及び背側弾性伸縮部材を利用することにより、資材増加を回避できるとともに、腹側湾曲弾性部材による引張力が臀裂対向部に自然と向かうようになり、本発明の腹側への引張作用がより一層効果的に発揮されるようになる。
(Function and effect)
The bending fit portion can also be formed by providing a dedicated elastic member different from the ventral curved elastic member and the back elastic elastic member at the crack facing portion, but the ventral curved elastic member and the back elastic By using the expansion and contraction member, it is possible to avoid an increase in material, and the tensile force by the ventral curved elastic member is naturally directed to the crack-opposing portion, and the pulling action to the ventral side of the present invention is more effective. Will come into play.
＜請求項４記載の発明＞
前記腹側湾曲弾性部材及び背側湾曲弾性部材は、前記内装体と重なる部分のうち前記臀裂対向部に位置する部分を除いた部分では細かく切断され、前記臀裂対向部に位置する部分及び前記内装体と重ならない部分は細かく切断されずに連続部分として残されている、請求項３記載のパンツタイプ使い捨ておむつ。
<Invention of Claim 4>
The ventral bending elastic member and the dorsal bending elastic member are finely cut at a portion excluding a portion positioned at the crack facing portion of a portion overlapping the interior body, and a portion positioned at the crack facing portion and The pants-type disposable diaper according to claim 3, wherein a portion that does not overlap with the interior body is left as a continuous portion without being cut finely.
（作用効果）
このように、腹側湾曲弾性部材及び背側湾曲弾性部材のうち内装体と重なる部分を、臀裂対向部に位置する部分を除いて細かく切断することにより、内装体を不必要に収縮させずに、前述の本発明の作用により股間から臀裂に対するフィット性を向上させることができ、もって股間から臀裂に対するフィット性がより一層のものとなる。
(Function and effect)
In this way, the inner body is not unnecessarily contracted by finely cutting the portion of the ventral curved elastic member and the back curved elastic member that overlaps the inner body except for the portion located at the crack facing portion. In addition, the above-described action of the present invention can improve the fit to the rupture from the crotch, thereby further improving the fit to the rupture from the crotch.
＜請求項５記載の発明＞
前記前身頃における外装シート及び後身頃における外装シートのそれぞれにおいて、ウエスト開口部の縁部に、幅方向に沿って延在する細長状のウエスト部弾性部材が複数本縦方向に間隔を空けてそれぞれ幅方向に沿って所定の伸長率で伸長された状態で固定されるとともに、前記ウエスト部弾性部材よりも前後方向中央部側の領域に、幅方向に沿って延在する細長状の腰回り弾性部材が複数本縦方向に間隔を空けてそれぞれ幅方向に沿って所定の伸長率で伸長された状態で固定されている、請求項４記載のパンツタイプ使い捨ておむつ。
<Invention of Claim 5>
In each of the exterior sheet in the front body and the exterior sheet in the back body, a plurality of elongated waist elastic members extending along the width direction are spaced apart in the longitudinal direction at the edge of the waist opening, respectively. Elongated waist elastic that is fixed in a state of being stretched at a predetermined stretch rate along the width direction and extends along the width direction in a region closer to the center in the front-rear direction than the waist elastic member 5. The pants-type disposable diaper according to claim 4, wherein a plurality of members are fixed in a state where they are stretched at a predetermined stretch rate along the width direction at intervals in the longitudinal direction.
（作用効果）
このような幅方向に沿うウエスト部弾性部材及び腰回り弾性部材により周方向の締め付けを行う構成とすると、周方向の締め付け力を十分に確保でき、これを支えとして腹側湾曲弾性部材及び背側湾曲弾性部材の収縮作用が確実に発揮されるとともに、腹側湾曲弾性部材及び背側湾曲弾性部材のバランス作用に対してウエスト弾性部材及び腰回り弾性部材の収縮力が悪影響を及ぼし難いため好ましい。
(Function and effect)
When the waist direction elastic member and the waist elastic member along the width direction are configured to perform the tightening in the circumferential direction, a sufficient tightening force in the circumferential direction can be secured, and the abdominal curve elastic member and the back curve are supported by this. The elastic member is preferable because the contracting action of the elastic member is surely exerted, and the contracting force of the waist elastic member and the waist elastic member hardly affects the balance action of the ventral curved elastic member and the back curved elastic member.
＜請求項６記載の発明＞
前記外装シートは、少なくとも前記ウエスト部弾性部材、腰回り弾性部材、腹側湾曲弾性部材及び背側湾曲弾性部材を有する部分では複数枚の不織布が接着剤で張り合わせてなるとともに、それら不織布間に前記ウエスト部弾性部材、腰回り弾性部材、腹側湾曲弾性部材及び背側湾曲弾性部材が挟持固定されており、
前記外装シートの坪量は３０〜７５ｇ／ｍ2であり、
前記前身頃及び後身頃におけるウエスト部弾性部材は、それぞれ、太さ３１０〜１２４０ｄｔｅｘ、本数が５〜１０本、間隔が０〜１０ｍｍ、及び固定時の伸長率が１８０〜３５０％であり、
前記前身頃及び後身頃における腰回り部弾性部材は、それぞれ、太さ３１０ｄｔｅｘ、本数が６〜２６本、間隔が５〜４０ｍｍ、及び固定時の伸長率が１８０〜３５０％であり、
前記腹側湾曲弾性部材は、太さ４７０〜１，２４０ｄｔｅｘ、本数が３〜１０本、間隔が１０〜３５ｍｍ、及び固定時の伸長率が２３０〜３８０％で且つ前記背側湾曲弾性部材より高い伸長率であり、かつ
前記背側湾曲弾性部材は、太さ４７０〜１，２４０ｄｔｅｘ、本数が３〜１０本、間隔が１０〜３５ｍｍ、及び固定時の伸長率が２００〜３５０％である、
請求項５記載のパンツタイプ使い捨ておむつ。
<Invention of Claim 6>
The exterior sheet is composed of a plurality of non-woven fabrics bonded together with an adhesive at a portion having at least the waist elastic member, waist elastic member, ventral curved elastic member and dorsal curved elastic member. The waist elastic member, the waist elastic member, the ventral curved elastic member and the dorsal curved elastic member are clamped and fixed,
The basis weight of the exterior sheet is 30 to 75 g / m 2 ,
The waist elastic members in the front body and the back body have a thickness of 310 to 1240 dtex, a number of 5 to 10, a distance of 0 to 10 mm, and an elongation rate of 180 to 350% when fixed,
The waist elastic members in the front body and the back body have a thickness of 310 dtex, a number of 6 to 26, a distance of 5 to 40 mm, and an elongation rate of 180 to 350% when fixed,
The ventral curved elastic member has a thickness of 470 to 1,240 dtex, a number of 3 to 10, a distance of 10 to 35 mm, and an elongation rate when fixed of 230 to 380%, which is higher than the dorsal curved elastic member. And the dorsal curved elastic member has a thickness of 470 to 1,240 dtex, a number of 3 to 10, a distance of 10 to 35 mm, and an elongation rate of 200 to 350% when fixed.
The pants-type disposable diaper according to claim 5.
（作用効果）
本発明は、このような構造の外装シートにおいて、このように各弾性部材を設けるのが好ましい。
(Function and effect)
In the exterior sheet having such a structure, the present invention preferably provides each elastic member in this way.
＜請求項７記載の発明＞
前記内装体の両側部に、内装体の側部の裏側から表側に回りこんで内装体の表側に突出する立体ギャザーがそれぞれ設けられており、この立体ギャザーは突端部及び前記内装体の側方から裏側までの部位のそれぞれに、前後方向に沿って延在する細長状のギャザー弾性部材がその長手方向に所定の伸長率で伸長された状態で固定されており、
前記腹側湾曲弾性部材の軌跡の後端部と前記背側湾曲弾性部材の軌跡の前端部とが前後方向に離間しており、
前記ギャザー弾性部材のうち前記内装体の側方から裏側までの部位に位置するものが、前記腹側湾曲弾性部材と内装体の側縁とが交差する位置から、前記背側湾曲弾性部材と内装体の側縁とが交差する位置まで延在している、
請求項３〜６のいずれか１項に記載のパンツタイプ使い捨ておむつ。
<Invention of Claim 7>
Three-dimensional gathers are provided on both sides of the interior body so as to protrude from the back side of the side of the interior body to the front side and project to the front side of the interior body. The elongated gather elastic member extending along the front-rear direction is fixed to each of the parts from the back side to the back side in a state of being elongated at a predetermined elongation rate in the longitudinal direction,
The rear end portion of the locus of the ventral curved elastic member and the front end portion of the locus of the dorsal curved elastic member are separated in the front-rear direction.
Among the gathered elastic members, those located in the region from the side to the back side of the interior body are arranged so that the dorsal curved elastic member and the interior are located from the position where the abdomen curved elastic member and the side edge of the interior body intersect. Extending to the position where the side edges of the body intersect,
The pants-type disposable diaper according to any one of claims 3 to 6.
（作用効果）
本発明では、腹側湾曲弾性部材の軌跡の後端部と背側湾曲弾性部材の軌跡の前端部とが前後方向中間部において交差する形態を採用することもできるが、交差部分が硬くなり、製造も複雑となるため、腹側湾曲弾性部材の軌跡の後端部と背側湾曲弾性部材の軌跡の前端部とが前後方向に離間している形態が望ましい。しかし、この場合、腹側湾曲弾性部材による引張作用が、屈曲フィット部のうち腹側湾曲弾性部材による部分に偏るようになる。これに対して、上述のように、ギャザー弾性部材のうち内装体の側方から裏側までの部位に位置するものが、腹側湾曲弾性部材と内装体の側縁とが交差する位置から、背側湾曲弾性部材と内装体の側縁とが交差する位置まで延在していると、腹側湾曲弾性部材による引張作用が、当該ギャザー弾性部材を介して屈曲フィット部における背側湾曲弾性部材による部分まで作用するようになり、本発明の腹側引張作用がより一層のものとなる。
(Function and effect)
In the present invention, it is possible to adopt a form in which the rear end portion of the trajectory of the ventral curved elastic member and the front end portion of the trajectory of the dorsal curved elastic member intersect at the intermediate portion in the front-rear direction, but the intersecting portion becomes hard, Since manufacturing is also complicated, it is desirable that the rear end portion of the locus of the ventral curved elastic member and the front end portion of the locus of the dorsal curved elastic member be separated in the front-rear direction. However, in this case, the tension action by the ventral curved elastic member is biased to the portion by the ventral curved elastic member in the bent fitting portion. On the other hand, as described above, among the gathered elastic members, those located in the region from the side of the interior body to the back side are separated from the position where the ventral curved elastic member and the side edge of the interior body intersect. When the side curved elastic member and the side edge of the interior body extend to a position where the side curved elastic member extends, the tension action by the ventral side curved elastic member is caused by the back side curved elastic member in the bending fit portion via the gather elastic member. It works to a part, and the ventral side tension action of the present invention becomes much more.
＜請求項８記載の発明＞
前記内装体と前記外装シートとの固定領域は、前後方向中間部よりもその前後両側の部分の幅が広い括れ形状とされており、かつこの固定領域における前側の幅の広い部分の前後方向長さが、後側の幅の広い部分の前後方向長さよりも長い、請求項１〜７のいずれか１項に記載のパンツタイプ使い捨ておむつ。
<Invention of Claim 8>
The fixing region between the interior body and the exterior sheet has a constricted shape in which the width of both front and rear sides is wider than the front-rear direction middle portion, and the front-rear direction length of the front wide portion in the fixing region The pants-type disposable diaper according to claim 1, wherein the length is longer than the length in the front-rear direction of the wide portion on the rear side.
（作用効果）
このように内装体の前側の固定領域を広い幅で前後方向に長く形成することで、本発明の腹側への引張作用がより一層のものとなる。また、本発明の腹側への引張作用により臀裂対向部が腹側に引っ張られると、内装体の前側の形状が不適切に変形するおそれがあるが、このように内装体の前側の固定領域を広い幅で前後方向に長く形成することで、内装体前側の不適切な変形を防止することができる。
(Function and effect)
Thus, by forming the fixing region on the front side of the interior body long in the front-rear direction with a wide width, the tensioning action on the ventral side of the present invention is further enhanced. Further, when the fracture facing portion is pulled to the ventral side due to the pulling action on the ventral side of the present invention, the shape of the front side of the interior body may be inappropriately deformed. By forming the region long in the front-rear direction with a wide width, inappropriate deformation on the front side of the interior body can be prevented.
以上のとおり、本発明によれば、臀裂から股間にかけてのフィット性が改善され、装着時に股間部がモコモコし難くなる、等の利点がもたらされる。 As described above, according to the present invention, the fit property from the crack to the crotch is improved, and the crotch portion is less likely to be bent when worn.
以下、本発明の一実施形態について、添付図面を参照しつつ詳説する。
図１〜図１２はパンツタイプ使い捨ておむつの実施の形態を示している。このパンツタイプ使い捨ておむつ１（以下、単におむつともいう。）は、前身頃Ｆ及び後身頃Ｂを形成する外装シート２０と、この外装シート２０の内面に固定され一体化された内装体１０とを有しており、内装体１０は液透過性表面シート１１と液不透過性裏面側シート１２との間に吸収体１３が介在されてなるものである。製造に際しては、外装シート２０の内面（上面）に対して内装体１０の裏面がホットメルト接着剤Ｇなどの接合手段によって固定された後に、内装体１０および外装シート２０が前身頃Ｆ及び後身頃Ｂの境界である縦方向（前後方向）中央で折り畳まれ、その両側部が相互に熱溶着またはホットメルト接着剤などによって接合され、サイドシール部２１，２２が形成されることによって、ウエスト開口部及び左右一対のレッグ開口部が形成されたパンツタイプ使い捨ておむつとなる。
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1-12 has shown embodiment of the underpants type disposable diaper. The pants-type disposable diaper 1 (hereinafter also simply referred to as a diaper) includes an exterior sheet 20 that forms a front body F and a back body B, and an interior body 10 that is fixed and integrated with the inner surface of the exterior sheet 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior sheet 20 by a joining means such as a hot melt adhesive G, the interior body 10 and the exterior sheet 20 are the front body F and the back body. Folded at the center of the vertical direction (front-rear direction) which is the boundary of B, both sides thereof are joined to each other by heat welding or hot melt adhesive, etc., and side seal portions 21 and 22 are formed. And it becomes a pants type disposable diaper in which a pair of left and right leg openings are formed.
（内装体の構造例）
内装体１０は、図４〜図６に示すように、不織布などからなる液透過性表面シート１１と、ポリエチレン等からなる液不透過性裏面側シート１２との間に、吸収体１３を介在させた構造を有しており、表面シート１１を透過した排泄液を吸収保持するものである。
(Structural example of interior body)
As shown in FIGS. 4 to 6, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained.
吸収体１３の表面側（肌当接面側）を覆う液透過性表面シート１１としては、有孔または無孔の不織布や多孔性プラスチックシートなどが好適に用いられる。不織布を構成する素材繊維は、ポリエチレンまたはポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維の他、レーヨンやキュプラ等の再生繊維、綿等の天然繊維とすることができ、スパンレース法、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法等の適宜の加工法によって得られた不織布を用いることができる。これらの加工法の内、スパンレース法は柔軟性、ドレープ性に富む点で優れ、サーマルボンド法は嵩高でソフトである点で優れている。液透過性表面シート１１に多数の透孔を形成した場合には、尿などが速やかに吸収されるようになり、ドライタッチ性に優れたものとなる。液透過性表面シート１１は、吸収体１３の側縁部を巻き込んで吸収体１３の裏面側まで延在している。 As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.
吸収体１３の裏面側（非肌当接面側）を覆う液不透過性裏面側シート１２は、ポリエチレンまたはポリプロピレンなどの液不透過性プラスチックシートが用いられるが、近年はムレ防止の点から透湿性を有するものが好適に用いられる。この遮水・透湿性シートは、たとえばポリエチレンやポリプロピレン等のオレフィン樹脂中に無機充填材を溶融混練してシートを形成した後、一軸または二軸方向に延伸することにより得られる微多孔性シートである。 As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.
吸収体１３としては、公知のもの、例えばパルプ繊維の積繊体、セルロースアセテート等のフィラメントの集合体、あるいは不織布を基本とし、必要に応じて高吸収性ポリマーを混合、固着等してなるものを用いることができ、図示例では平面形状を略方形状として成形されたものが使用され、その幅寸法は股間部への当たりによって着用者にゴワ付き感を与えない寸法幅となっている。この吸収体１３は、形状及びポリマー保持等のため、必要に応じてクレープ紙等の、液透過性及び液保持性を有する包装シート１４によって包装することができる。吸収体１３の形状は、図示形態のように長方形状とする他、背側及び腹側に対して股間部の幅が狭い砂時計形状（括れ形状）とすることもできる。 Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. In the example shown in the figure, a shape formed with a substantially rectangular planar shape is used, and the width dimension is a dimension width that does not give the wearer a feeling of goreness by hitting the crotch part. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer. The shape of the absorber 13 may be a rectangular shape as shown in the figure, or may be an hourglass shape (constricted shape) in which the width of the crotch portion is narrower than the back side and the abdominal side.
内装体１０の両側部には脚周りにフィットする立体ギャザーＢＳが形成されているのが好ましい。この立体ギャザーＢＳはギャザー不織布１５により形成される、ギャザー不織布としては、図５及び図６に示されるように、折返しによって二重シートとした不織布が好適に用いられ、液透過性表面シート１１によって巻き込まれた吸収体１３の側縁部をさらにその上側から巻き込んで吸収体１３の裏面側まで延在して接着されている。より具体的には、ギャザー不織布１５は、おむつ１の長手方向中間部では、立体ギャザーＢＳ形成部分を残し、幅方向中間部から吸収体１３の裏面側に亘る範囲がホットメルト接着剤等によって接着され、また長手方向前後端部では、幅方向中間部から一方側端縁までの区間が吸収体１３の裏面側に亘る範囲で接着されるとともに、立体ギャザーＢＳを形成する部分を吸収体１３の上面部にて折り畳むようにしながらホットメルト接着剤等により接着している。 It is preferable that solid gather BSs that fit around the legs are formed on both sides of the interior body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIGS. 5 and 6, a nonwoven fabric made into a double sheet by folding is preferably used. The side edge portion of the wound absorbent body 13 is further wound from the upper side thereof and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the diaper 1, and a range from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the longitudinal front and rear end portions, the section from the width direction intermediate portion to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and a portion forming the three-dimensional gather BS is attached to the absorber 13 It is bonded with a hot melt adhesive or the like while being folded at the upper surface.
二重シート不織布によって形成されたギャザー不織布１５の内部には、起立先端側部分及び基端側部分に複数本の細長状のギャザー弾性部材１６、１７が配設されている。ギャザー弾性部材１６、１７は、製品状態において図５に二点鎖線で示すように、弾性伸縮力により吸収体側縁部より突出する不織布部分を起立させて立体ギャザーＢＳを形成するためのものである。 Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of elongated gather elastic members 16 and 17 are disposed on the standing tip side portion and the base end side portion. The gather elastic members 16 and 17 are for forming a three-dimensional gather BS by raising the nonwoven fabric portion protruding from the absorber side edge by elastic expansion and contraction as shown by a two-dot chain line in FIG. 5 in the product state. .
液不透過性裏面側シート１２は、二重シート状のギャザー不織布１５の内部まで進入し、図５に示されるように、立体ギャザーＢＳの下端側において防漏壁を構成するようになっている。この液不透過性裏面側シート１２としては、排便や尿などの褐色が出ないように不透明のものを用いるのが望ましい。不透明化としては、プラスチック中に、炭酸カルシウム、酸化チタン、酸化亜鉛、ホワイトカーボン、クレイ、タルク、硫酸バリウムなどの顔料や充填材を内添してフィルム化したものが好適に使用される。 The liquid-impermeable back side sheet 12 enters the inside of the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gathered BS as shown in FIG. . As the liquid-impermeable back side sheet 12, it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.
ギャザー弾性部材１６、１７としては、通常使用されるスチレン系ゴム、オレフィン系ゴム、ウレタン系ゴム、エステル系ゴム、ポリウレタン、ポリエチレン、ポリスチレン、スチレンブタジエン、シリコン、ポリエステル等の素材を用いることができる。また、外側から見え難くするため、太さは９２５ｄｔｅｘ以下、テンションは１５０〜３５０％、間隔は７．０ｍｍ以下として配設するのがよい。なお、糸状弾性伸縮部材に代えて、ある程度の幅を有するテープ状弾性伸縮部材を用いるようにしてもよい。 As the gathered elastic members 16 and 17, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.
前述のギャザー不織布１５を構成する素材繊維も液透過性表面シート１１と同様に、ポリエチレンまたはポリプロピレン等のオレフィン系、ポリエステル系、アミド系等の合成繊維の他、レーヨンやキュプラ等の再生繊維、綿等の天然繊維とすることができ、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法等の適宜の加工方法に得られた不織布を用いることができるが、特にはムレを防止するために坪量を抑えて通気性に優れた不織布を用いるのがよい。さらにギャザー不織布１５については、尿などの透過を防止するとともに、カブレを防止しかつ肌への感触性（ドライ感）を高めるために、シリコン系、パラフィン金属系、アルキルクロミッククロイド系撥水剤などをコーティングした撥水処理不織布を用いるのが望ましい。 In the same manner as the liquid-permeable surface sheet 11, the material fibers constituting the gathered nonwoven fabric 15 are olefin-based, polyester-based, amide-based synthetic fibers such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.
（外装シートの構造例）
外装シート２０は、図４〜図６にも示されるように、それぞれ上層不織布２０Ａ及び下層不織布２０Ｂ（つまり、この形態では下層不織布が最外側不織布となる）からなる２層構造の不織布シートとされ、上層不織布２０Ａと下層不織布２０Ｂとの間、及び下層不織布２０Ｂをウエスト開口縁で内面側に折り返してなる折り返し部分２０Ｃの不織布間に各種弾性部材が伸長状態で挟持固定され、伸縮性が付与されている。平面形状は、中間両側部に夫々脚部開口を形成するために形成された凹状の脚回りライン２９により、全体として擬似砂時計形状をなしている。弾性部材としては、合成ゴムや天然ゴムを糸状、紐状、網状、シート状等の任意の形態に加工したものを用いることができる。
(External sheet structure example)
As shown in FIGS. 4 to 6, the exterior sheet 20 is a nonwoven fabric sheet having a two-layer structure composed of an upper layer nonwoven fabric 20 </ b> A and a lower layer nonwoven fabric 20 </ b> B (that is, the lower layer nonwoven fabric is the outermost nonwoven fabric in this embodiment). Various elastic members are sandwiched and fixed in an expanded state between the nonwoven fabric of the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B and between the nonwoven fabrics of the folded portion 20C formed by folding the lower layer nonwoven fabric 20B to the inner surface side at the waist opening edge, thereby imparting elasticity. ing. The planar shape has a pseudo hourglass shape as a whole by concave leg-around lines 29 formed to form leg openings on both sides of the middle. As the elastic member, a synthetic rubber or natural rubber processed into an arbitrary form such as a thread, string, net, or sheet can be used.
外装シート２０に設けられる弾性部材は、図１〜３、図９、図１５には収縮力作用部分のみが示され、図７及び図８には取り付け部分の全てが示されている。図示形態の外装シート２０においては、前身頃Ｆ及び後身頃Ｂのそれぞれにおいて、ウエスト開口部近傍２３に配置されたウエスト部弾性部材２４，２４と、ウエスト部弾性部材２４，２４よりも股間側に配置された、縦方向に間隔をおいて幅方向に沿って配置された複数の腰回り弾性部材２５と、腰回り弾性部材群２５とは別に、前身頃Ｆと後身頃Ｂとを接合する両サイドシール部２１，２２から各側のレッグ開口部に沿って湾曲しつつ延在する湾曲弾性部材２６，２８と、を備えている。なお、本外装シート２０では、湾曲弾性部材２６，２８により脚周りに対するフィット性が確保されるため、脚回りライン２９に沿って前身頃Ｆから後身頃Ｂまで実質的に連続する脚回り弾性部材は設けられていない。 1-3, FIG. 9 and FIG. 15 show only the contraction force acting part, and FIG. 7 and FIG. 8 show all the attaching parts. In the exterior sheet 20 of the illustrated form, in each of the front body F and the back body B, the waist elastic members 24, 24 disposed in the vicinity of the waist opening 23 and on the crotch side than the waist elastic members 24, 24 Apart from the plurality of waist elastic members 25 arranged along the width direction at intervals in the vertical direction and the waist elastic members 25, both the front body F and the back body B are joined. Curved elastic members 26 and 28 extending from the side seal portions 21 and 22 while being curved along the leg openings on the respective sides. In the exterior sheet 20, the curved elastic members 26 and 28 ensure the fit around the legs. Therefore, the leg elastic members substantially continuous from the front body F to the back body B along the leg line 29. Is not provided.
ウエスト部弾性部材２４，２４は、サイドシール部２１，２２を有する縦方向範囲のうち、ウエスト開口縁近傍に上下方向に間隔をおいて配設された複数条の糸ゴム状弾性部材であり、身体のウエスト部回りを締め付けるように伸縮力を与えることによりおむつのウエスト開口縁を身体に装着するためのものである。このウエスト部弾性部材２４は、図示例では糸ゴムを用いたが、例えばテープ状の伸縮部材を用いてもよい。また、図示形態のウエスト部弾性部材２４，２４は、ウエスト部における下層不織布２０Ｂの折り返し部分２０Ｃの不織布間に挟持されているが、上層不織布２０Ａと下層不織布２０Ｂとの間に挟持しても良い。 The waist elastic members 24, 24 are a plurality of thread rubber-like elastic members arranged in the vertical direction in the vicinity of the waist opening edge in the vertical range having the side seal portions 21, 22, It is for attaching the waist opening edge of a diaper to a body by giving an expansion / contraction force so as to tighten around the waist part of the body. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Moreover, although the waist part elastic members 24 and 24 of an illustration form are clamped between the nonwoven fabrics of the folding | returning part 20C of the lower layer nonwoven fabric 20B in a waist part, you may clamp between 20 A of upper layer nonwoven fabrics, and the lower layer nonwoven fabric 20B. .
腰回り弾性部材２５は、サイドシール部２１，２２と対応する縦方向範囲、及びそれよりも股間側の範囲のうち、概ね上部から下部までの範囲に亘り、上下方向に間隔をおいて幅方向に沿って配設された糸ゴム等の細長状弾性部材であり、前身頃Ｆ及び後身頃Ｂの腰回り部分に夫々幅方向の伸縮力を与え、おむつを身体に密着させるためのものである。なお、ウエスト部弾性部材２４，２４と腰回り弾性部材２５との境界は必ずしも明確でなくてよい。例えば、前身頃Ｆ及び後身頃Ｂに上下方向に間隔をおいて幅方向に配置された弾性部材の内、数は特定できなくても、上部側の何本かがウエスト部弾性部材として機能し、残りの弾性部材が腰回り弾性部材として機能していればよい。 The waist elastic member 25 has a longitudinal direction with an interval in the vertical direction over a range from the upper part to the lower part in the longitudinal range corresponding to the side seal portions 21 and 22 and the range on the crotch side. Is an elongated elastic member, such as rubber thread, disposed along the waist, and applies a stretching force in the width direction to the waist portions of the front body F and the back body B, respectively, so that the diaper is in close contact with the body. . Note that the boundary between the waist elastic members 24, 24 and the waist elastic member 25 is not necessarily clear. For example, among the elastic members arranged in the width direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, several on the upper side function as the waist elastic members. The remaining elastic members only have to function as waist elastic members.
（湾曲弾性部材）
腹側湾曲弾性部材２８は、前身頃Ｆの右のサイドシール部２１から右のレッグ開口部に沿って臀裂対向部の右側方に至り、臀裂対向部を右から左に幅方向に横切りつつ前向きに方向転換され、臀裂対向部の左側方から左のレッグ開口部に沿って前身頃Ｆの左のサイドシール部２１に至るパターンをもって、長手方向に所定の伸長率で伸長された状態で固定されているものである。
(Curved elastic member)
The ventral curved elastic member 28 extends from the right side seal portion 21 of the front body F to the right side of the crack facing portion along the right leg opening, and crosses the crack facing portion in the width direction from right to left. While being turned forward, the pattern is extended at a predetermined elongation rate in the longitudinal direction with a pattern extending from the left side of the crack facing part to the left side seal part 21 of the front body F along the left leg opening. It is fixed with.
また、図示形態では、腹側湾曲弾性部材２８のウエスト側に、前身頃Ｆの右のサイドシール部２１から前身頃Ｆの右のレッグ開口部に沿って延在し、臀裂対向部の前側において内装体１０を幅方向に横切りつつ前向きに方向転換され、前身頃Ｆの左のレッグ開口部に沿って前身頃Ｆの左のサイドシール部２１に至るパターンをもって、長手方向に所定の伸長率で伸長された状態で固定されている腰回り湾曲弾性部材２７も設けられている。この腰回り湾曲弾性部材２７に代えて背側の腰回り弾性部材２５の本数を股間側に増やすことも可能である。 Moreover, in the illustrated form, it extends along the right leg opening of the front body F from the right side seal portion 21 of the front body F to the waist side of the ventral curved elastic member 28, , The inner body 10 is crossed in the width direction and turned forward, and has a pattern extending to the left side seal portion 21 of the front body F along the left leg opening of the front body F and having a predetermined elongation rate in the longitudinal direction. There is also provided a waist-curving elastic member 27 that is fixed in a stretched state. It is possible to increase the number of back waist elastic members 25 on the crotch side instead of the waist curved elastic members 27.
一方、背側湾曲弾性部材２６は、後身頃Ｂの右のサイドシール部２２から後身頃Ｂの右のレッグ開口部に沿って臀裂対向部の右側方に至り、臀裂対向部における右側部から左側部まで幅方向に横切りつつ後向きに方向転換され、臀裂対向部の左側方から後身頃Ｂの左のレッグ開口部に沿って後身頃Ｂの左のサイドシール部２２に至るパターンをもって、長手方向に所定の伸長率で伸長された状態で固定されているものである。背側湾曲弾性部材２６は省略することもできる。 On the other hand, the dorsal curved elastic member 26 extends from the right side seal portion 22 of the back body B to the right side of the crack facing portion along the right leg opening of the back body B, and the right side portion of the crack facing portion. From the left side of the crack facing part to the left side seal part 22 of the back body B along the left leg opening of the back body B, It is fixed in a state of being stretched at a predetermined stretch rate in the longitudinal direction. The dorsal curved elastic member 26 can be omitted.
また、図示形態では、背側湾曲弾性部材２６のウエスト側においても、後身頃Ｂの右のサイドシール部２１から後身頃Ｂの右のレッグ開口部に沿って延在し、臀裂対向部の後側において内装体１０を幅方向に横切りつつ後向きに方向転換され、後身頃Ｂの左のレッグ開口部に沿って後身頃Ｂの左のサイドシール部２１に至るパターンをもって、長手方向に所定の伸長率で伸長された状態で固定されている腰回り湾曲弾性部材２７も設けられている。この腰回り湾曲弾性部材２７に代えて背側の腰回り弾性部材２５の本数を股間側に増やすことも可能である。 Further, in the illustrated embodiment, also on the waist side of the back-side curved elastic member 26, it extends along the right leg opening of the back body B from the right side seal portion 21 of the back body B, and On the rear side, the inner body 10 is crossed in the width direction and turned rearward, and has a pattern extending in the longitudinal direction along the left leg opening of the back body B and reaching the left side seal portion 21 of the back body B. Also provided is a waist-curving elastic member 27 that is fixed in a state of being stretched at a stretch rate. It is possible to increase the number of back waist elastic members 25 on the crotch side instead of the waist curved elastic members 27.
特に、図２と図８との対比からも分るように、本実施形態では、前身頃Ｆ及び後身頃Ｂに配置された腰回り湾曲弾性部材２７（腰回り湾曲弾性部材２７に代えて腰回り弾性部材２５の本数を股間側に増やす場合には、その腰回り弾性部材２５）及び湾曲弾性部材２６，２８は、湾曲弾性部材２６，２８の臀裂対向部に位置する部分２６ｄ，２８ｄを除いて、内装体１０を横切る部分が細かく切断されており、弾性部材の細かな切断片（図示略）が残っているものの収縮力が作用しない非伸縮領域とされている。すなわち、図８に示すように、腰回り湾曲弾性部材２７及び湾曲弾性部材２６，２８を、一方側の側部接合縁２２から内装体１０を横切って他方（反対）側の側部接合縁２２まで連続的に設けた後に、臀裂対向部を残すような所定の切断パターンＣＰにより内装体１０を横切る部分を細かく切断し、収縮力が採用しないようにするものである。弾性部材２５，２６，２８を内装体１０と重なる部分で不連続とすることにより、内装体１０（特に吸収体１３）の幅方向の収縮を防止することができる。この非伸縮領域は弾性部材を全く取り付けないことにより形成することもできる。もちろん、腰回り湾曲弾性部材２７及び湾曲弾性部材２６，２８のうち少なくとも一部を、内装体１０と重なる部分において切断せずに、内装体１０を横切って連続的に配置することもできる。いずれにせよ、本発明では、腹側湾曲弾性部材２８によって、少なくとも後身頃Ｂにおける臀裂対向部の側方までの左右のレッグ開口部に沿う部分に収縮力が作用するように構成される。 In particular, as can be seen from the comparison between FIG. 2 and FIG. 8, in this embodiment, the waist-curved elastic member 27 (the waist-curved elastic member 27 is replaced with the waist-curved elastic member 27) disposed in the front body F and the back body B. When the number of the elastic members 25 is increased to the crotch side, the waist elastic member 25) and the curved elastic members 26 and 28 are provided with portions 26d and 28d located at the crack facing portions of the curved elastic members 26 and 28, respectively. Except for this, the portion crossing the interior body 10 is finely cut, and although a fine cut piece (not shown) of the elastic member remains, it is a non-stretchable region where the contraction force does not act. That is, as shown in FIG. 8, the waist-curved elastic member 27 and the curved elastic members 26, 28 cross the interior body 10 from the side joint edge 22 on one side and the side joint edge 22 on the other (opposite) side. The portion that crosses the interior body 10 is finely cut with a predetermined cutting pattern CP that leaves a crack-opposing portion, so that the contraction force is not employed. By making the elastic members 25, 26 and 28 discontinuous at the portion overlapping the interior body 10, shrinkage in the width direction of the interior body 10 (particularly the absorber 13) can be prevented. This non-stretchable region can also be formed by not attaching any elastic member. Of course, at least a part of the waist-curved elastic member 27 and the curved elastic members 26 and 28 can be continuously arranged across the interior body 10 without being cut at a portion overlapping the interior body 10. In any case, in the present invention, the abdominal curved elastic member 28 is configured so that a contracting force acts on at least a portion along the left and right leg openings up to the side of the crack facing portion in the back body B.
湾曲弾性部材２６，２８は、その長手方向中間に縦方向との鋭角側交差角θ（以下、縦方向交差角ともいう）が最小となる最小点を有するとともに、この最小点から幅方向両側に向かうにつれて縦方向交差角θが０度〜９０度の範囲内で増加する所定の曲線であって、且つおむつを展開した状態で内装体１０の両側部と重なる領域内に縦方向交差角θが６０°以下となる交差部分７０を有する所定の曲線に沿って配置するのが好ましい。湾曲弾性部材２６，２８は図示例のようにその全体が湾曲している形態の他、部分的に直線状の部分を有する形態も採用することができる。 The curved elastic members 26 and 28 have a minimum point at which an acute angle crossing angle θ (hereinafter also referred to as a vertical crossing angle) with the vertical direction is minimum in the longitudinal direction, and both sides in the width direction from the minimum point. The vertical crossing angle θ is a predetermined curve that increases in the range of 0 to 90 degrees as it goes, and the vertical crossing angle θ is in a region that overlaps both sides of the interior body 10 in a state where the diaper is unfolded. It is preferable to arrange along a predetermined curve having an intersecting portion 70 that is 60 ° or less. The curved elastic members 26, 28 may adopt a form having a partially linear portion in addition to a form in which the whole is curved as in the illustrated example.
湾曲弾性部材２６，２８は、一本であっても良いが複数本であるのが好ましく、特に、複数本の弾性伸縮部材を間隔を密にして実質的に一束として配置するのではなく、図示例のように、互いに交差することなく所定の伸縮ゾーンを形成するように所定の間隔を空けて複数本配置されるのが好ましい。 The number of the curved elastic members 26 and 28 may be one, but is preferably a plurality. In particular, the plurality of elastic elastic members are not arranged substantially as a bundle with a close interval, As in the illustrated example, it is preferable to arrange a plurality of them at predetermined intervals so as to form predetermined expansion / contraction zones without crossing each other.
また、腹側湾曲弾性部材２８の群と、背側湾曲弾性部材２６の群とは互いに交差することなく後身頃Ｂにおける前後方向中間部で縦方向に離間している。この最小縦方向離間距離は１０〜２０ｍｍ程度とするのが好ましい。湾曲弾性部材２６，２８を、前身頃Ｆ及び後身頃Ｂの両方に設ける場合、図１５に示すように、腹側湾曲弾性部材２８の群の一部又は全部と、背側湾曲弾性部材２６の群の一部又は全部とが臀裂対向部又はその近傍で交差する弾性部材の配置パターンとすることもできる。 Moreover, the group of the abdominal curved elastic member 28 and the group of the dorsal curved elastic member 26 are separated in the longitudinal direction at the middle part in the front-rear direction of the back body B without intersecting each other. The minimum vertical separation distance is preferably about 10 to 20 mm. When the curved elastic members 26 and 28 are provided on both the front body F and the back body B, as shown in FIG. 15, a part or all of the group of the ventral curved elastic members 28 and the back curved elastic member 26 It can also be set as the arrangement pattern of the elastic member which a part or all of a group cross | intersects in a crack opposition part or its vicinity.
上述した外装シート２０は、例えば特開平４−２８３６３号公報や、特開平１１−３３２９１３号公報記載の技術により製造することができる。また、湾曲弾性部材２６，２８を内装体１０上で切断し不連続化するには、特開２００２−３５０２９号公報、特開２００２−１７８４２８号公報及び特開２００２−２７３８０８号公報に記載される切断方法が好適に採用される。 The above-described exterior sheet 20 can be manufactured by, for example, techniques described in Japanese Patent Application Laid-Open No. 4-28363 and Japanese Patent Application Laid-Open No. 11-332913. Moreover, in order to cut | disconnect the curved elastic members 26 and 28 on the interior body 10, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. A cutting method is preferably employed.
腹側湾曲弾性部材２８は、後身頃Ｂに入ってから幅方向中央側に方向転換を開始するまでは内装体１０と重ならないように配置されていても良く、また、後身頃Ｂに入ってから幅方向中央側に方向転換を開始する部位よりも前側、特に後身頃Ｂに入るよりも前側において内装体１０と重なるように配置されていても良い。図示形態の腹側湾曲弾性部材２８では外側の一本が前者の通過形態となり、内側の二本が後者の通過形態となっている。 The abdomen curved elastic member 28 may be arranged so as not to overlap the interior body 10 after entering the back body B until it starts to change direction toward the center in the width direction. It may be arranged so as to overlap with the interior body 10 on the front side, in particular on the front side rather than entering the back body B, from the part where the direction change starts from the center to the width direction. In the illustrated ventral curved elastic member 28, the outer one has the former passage form and the inner two have the latter passage form.
（屈曲フィット部）
特徴的には、図１０〜図１２にも示すように、湾曲弾性部材２６，２８のうち臀裂対向部に位置する部分２８ｄにより、臀裂対向部が幅方向に収縮して装着者の臀裂に入り込む立体形状の屈曲フィット部４０が形成され、さらにこの屈曲フィット部４０から股間部にかけての部分は、腹側湾曲弾性部材２８によって、少なくとも前身頃Ｆから後身頃Ｂの臀裂対向部の側方までの左右のレッグ開口部に沿う部分に収縮力が作用する結果、鼠蹊部に沿ってウエスト側に引っ張られ、臀裂から股間にかけて良好にフィットするようになり、装着時に股間部がモコモコし難くなる。そして、この屈曲フィット部４０の屈曲形状は、湾曲弾性部材２６，２８のうち臀裂対向部に位置する部分２６ｄ，２８ｄの収縮作用によって弾力的に維持される。図１１中の二点鎖線で示される部分は折れ曲った状態の屈曲フィット部４０を示している。
(Bent fit part)
Characteristically, as shown in FIGS. 10 to 12, the crack opposing portion contracts in the width direction by the portion 28 d located in the crack opposing portion of the curved elastic members 26, 28, so that A three-dimensional bent fitting portion 40 that enters into the fissure is formed, and a portion from the bent fitting portion 40 to the crotch portion is at least a front-facing body F to a rear body B crack-opposing portion by the ventral curved elastic member 28. As a result of contraction force acting on the part along the left and right leg openings to the side, it is pulled to the waist side along the buttocks, so that it fits well from the crack to the crotch, and the crotch is moco moco when worn It becomes difficult to do. The bent shape of the bent fitting portion 40 is elastically maintained by the contracting action of the portions 26d and 28d located in the crack opposing portions of the curved elastic members 26 and 28. The part shown with the dashed-two dotted line in FIG. 11 has shown the bending fitting part 40 of the bent state.
これに対して、従来の一般的なパンツタイプ使い捨ておむつでは、図１６に示すように、臀裂対向部が膨出して肌から大きく離間する結果、股間部がモコモコし、普通の下着と顕著に異なる違和感が発生する。また、腹側湾曲弾性部材２６が臀裂対向部の側方まで延在せずに、前身頃内で内装体１０を横切るように構成されている場合には、臀裂対向部に幅方向に沿う専用の弾性伸縮部材を設けて、屈曲フィット部を形成したとしても、図１３及び図１４に示すように、屈曲フィット部４０が臀裂から離れ、フィット性が不十分となる。 On the other hand, in a conventional general pants-type disposable diaper, as shown in FIG. 16, as a result of the ruptured opposing part bulging and being largely separated from the skin, the crotch part is mokomoko, which is notably different from ordinary underwear. Different discomfort occurs. Further, when the ventral curved elastic member 26 is configured not to extend to the side of the crack-facing portion and to traverse the interior body 10 in the front body, Even if a bent elastic fit member is provided to form a bent fit portion, the bent fit portion 40 is separated from the crack as shown in FIGS. 13 and 14, and the fit becomes insufficient.
なお、屈曲フィット部４０は、腹側湾曲弾性部材２８や背側弾性伸縮部材とは別の専用の弾性部材を臀裂対向部に設けることによっても形成することができる。 The bent fit portion 40 can also be formed by providing a dedicated elastic member different from the ventral curved elastic member 28 and the back elastic elastic member in the crack facing portion.
また、上述の屈曲フィット部４０は、吸収体１３における臀裂対向部に縦方向に沿う溝４１やスリットを設ける等によってその形成を補助することもでき、その場合、適切な位置を折り目として屈曲フィット部４０が形成され、またその形状も維持され易くなる。 In addition, the above-described bent fitting portion 40 can be assisted by forming a groove 41 or a slit along the longitudinal direction in the crack-opposing portion of the absorbent body 13, and in that case, bending at an appropriate position as a fold. The fitting part 40 is formed and the shape thereof is easily maintained.
臀裂対向部における収縮力作用部分（図示例では湾曲弾性部材２６ｄ，２８ｄが切断されずに連続している領域）の寸法は適宜定めることができるが、幅は吸収体１３よりも狭く、例えば４０〜９０ｍｍの範囲内とするのが望ましく、前後方向長さは吸収体１３の前後方向長さの１／５〜１／２程度とするのが望ましい。また、その前端は前後方向中央又はその近傍に位置しているのが好ましい。前述の切断パターンにおける非切断部分ＮＣは、収縮力作用部分と同じ形状で、同じ又は若干大きめの寸法となる。また、前述の吸収体１３に設ける溝４１又はスリットの前後方向長さ及び幅は、この収縮力作用部分より短くても、長くても、同じでも良いが、幅については収縮力作用部分未満とするのが好ましい。 The size of the contraction force acting portion (the region where the curved elastic members 26d and 28d are continuous without being cut) in the crack facing portion can be appropriately determined, but the width is narrower than the absorber 13, for example, The length in the range of 40 to 90 mm is desirable, and the length in the front-rear direction is preferably about 1/5 to 1/2 of the length in the front-rear direction of the absorber 13. Moreover, it is preferable that the front end is located in the front-back direction center or its vicinity. The non-cut portion NC in the above-described cutting pattern has the same shape as the contraction force acting portion and has the same or slightly larger dimensions. Further, the length and width of the groove 41 or slit provided in the absorber 13 described above may be shorter, longer or the same as the contraction force acting part, but the width is less than the contraction force acting part. It is preferable to do this.
また、図１５に示すように、腹側湾曲弾性部材２８の軌跡の後端部と背側湾曲弾性部材２６の軌跡の前端部とが前後方向中間部において交差する形態を採用することもできるが、交差部分が硬くなり、製造も複雑となるため、腹側湾曲弾性部材２８の軌跡の後端部と背側湾曲弾性部材２６の軌跡の前端部とが前後方向に離間している形態が望ましい。しかし、この場合、腹側湾曲弾性部材２８による引張作用が、屈曲フィット部のうち腹側湾曲弾性部材２８による部分に偏るようになる。これに対して、図２及び図５に示すように、内装体１０の側方から裏側までの部位に位置するギャザー弾性部材１７が、少なくとも、腹側湾曲弾性部材２８と内装体１０の側縁とが交差する位置から、背側湾曲弾性部材２６と内装体１０の側縁とが交差する位置まで（図示例では内装体１０の前端部から後端部まで）延在していると、腹側湾曲弾性部材２８による引張作用が、当該ギャザー弾性部材１７を介して屈曲フィット部における背側湾曲弾性部材２６による部分まで作用するようになり、本発明の腹側引張作用がより一層のものとなる。 Further, as shown in FIG. 15, it is possible to adopt a form in which the rear end portion of the locus of the ventral curved elastic member 28 and the front end portion of the locus of the dorsal curved elastic member 26 intersect at the middle portion in the front-rear direction. Since the intersecting portion becomes hard and the manufacturing is complicated, it is desirable that the rear end portion of the locus of the ventral curved elastic member 28 and the front end portion of the locus of the dorsal curved elastic member 26 be separated in the front-rear direction. . However, in this case, the tensile action by the ventral curved elastic member 28 is biased toward the portion by the ventral curved elastic member 28 in the bent fitting portion. On the other hand, as shown in FIG. 2 and FIG. 5, the gather elastic member 17 located in the region from the side to the back side of the interior body 10 is at least a side edge of the ventral side curved elastic member 28 and the interior body 10. Extending from the position where the crossing and the back curved elastic member 26 and the side edge of the interior body 10 intersect (from the front end portion to the rear end portion of the interior body 10 in the illustrated example) The tensile action by the side curved elastic member 28 acts up to the portion by the back side curved elastic member 26 in the bent fitting portion via the gather elastic member 17, and the ventral side tensile action of the present invention is further enhanced. Become.
（縦方向の弾性変形時引張応力のバランス）
また、本発明では、前身頃Ｆにおける縦方向の弾性変形時引張応力が、後身頃Ｂにおける縦方向の弾性変形時引張応力よりも大きくなる前後収縮力バランスとするのが好ましい。弾性変形時引張応力は、おむつの両サイドシール部２１，２２を剥がして展開状態にした後、測定対象身頃のウエスト開口縁部と、測定対象でない反対の身頃の股間側端部とを引張試験機のチャックでそれぞれ掴み、引張試験を行うことにより計測することができる。弾性変形時引張応力の差は適宜定めることができるが、前身頃Ｆにおける１８０〜３２０％（自然長を１００％としたとき）伸長時の縦方向の弾性変形時引張応力が、後身頃Ｂにおけるそれの１．１〜１．２倍程度であるのが好ましい。なお、このことからも分かるように、弾性変形時引張応力の大小は同じ伸長率（伸長率１８０〜３８０％の範囲内とするのが好ましい）での大小を意味する。
(Balance of tensile stress during longitudinal elastic deformation)
Further, in the present invention, it is preferable that the longitudinal contraction force balance in which the tensile stress in the longitudinal direction in the front body F is greater than the tensile stress in the longitudinal direction in the back body B is greater. The tensile stress at the time of elastic deformation is the tensile test of the waist opening edge part of the body part to be measured and the crotch side end part of the opposite body part not to be measured, after peeling off both side seal parts 21 and 22 of the diaper and making them unfolded. It can be measured by holding each with a machine chuck and performing a tensile test. The difference in tensile stress at the time of elastic deformation can be determined as appropriate, but the tensile stress at the time of elastic deformation at the time of stretching in the front body F is 180 to 320% (when the natural length is 100%) in the back body B. It is preferably about 1.1 to 1.2 times that. As can be seen from this, the magnitude of the tensile stress at the time of elastic deformation means the magnitude at the same elongation rate (preferably within the range of the elongation rate of 180 to 380%).
このように前身頃Ｆにおける縦方向の弾性変形時の引張応力を後身頃Ｂのそれよりも大きくすると、図１０及び図１２に示すように、装着状態においては、後身頃Ｂの縦方向収縮力に抗する前身頃Ｆの縦方向収縮力によって、おむつの股間部から臀裂対向部にかけての部分が前側に移動しつつ持ち上がった状態で弾力的にバランスするため、前述した屈曲フィット部４０の臀裂へのフィット作用がより一層のものとなる。 Thus, when the tensile stress at the time of elastic deformation in the longitudinal direction in the front body F is made larger than that in the back body B, the longitudinal contraction force of the back body B in the mounted state as shown in FIGS. Because the longitudinal contraction force of the front body F resists the elastic balance in the state where the part from the crotch part of the diaper to the opposing part of the crack is lifted while moving to the front side, The effect of fitting to the crack is even more.
図示例では、このような前後収縮力バランスを腹側湾曲弾性部材２８及び背側湾曲弾性部材２６のみで形成しているが、これらとともに、あるいは背側湾曲弾性部材２６に代えて、細長状、シート状等の弾性部材を幅方向中間部に縦方向に沿って伸長状態で固定することにより形成しても良い（図示略）。 In the illustrated example, such a front-rear contraction force balance is formed only by the ventral curved elastic member 28 and the dorsal curved elastic member 26. You may form by fixing an elastic member, such as a sheet | seat shape, to the width direction intermediate part in the extending | stretching state along the vertical direction (not shown).
前述の前後収縮力バランスは、各身頃Ｆ，Ｂにおける縦方向の弾性変形時引張応力の因子、例えば収縮力が縦方向の分力を有する弾性部材２６，２８の太さ、伸長率、本数等の少なくとも一つを前後で異ならしめることにより実現できる。弾性部材２６，２８の太さ等を調整する場合、弾性部材２６，２８の本数は、おむつのサイズや配置に応じて定めるのが好ましいため、その配置及び本数を基本として、前述の前後収縮力バランスが得られるように、太さ及び伸長率の少なくとも一方を、後身頃Ｂよりも前身頃Ｆが太く又は高くなるようにするのが好ましい。 The aforementioned front-rear contraction force balance is a factor of the tensile stress in the longitudinal direction in each body F, B, for example, the thickness, elongation rate, number, etc. of the elastic members 26, 28 in which the contraction force has a longitudinal component. This can be achieved by making at least one of the above and below different. When adjusting the thickness or the like of the elastic members 26, 28, the number of the elastic members 26, 28 is preferably determined according to the size and arrangement of the diaper. In order to obtain a balance, it is preferable that at least one of the thickness and the elongation rate is such that the front body F is thicker or higher than the back body B.
具体的に、図示例の場合には次の範囲内で各部の仕様を定めるのが好ましい。なお、弾性部材の太さの単位をｄｔｅｘに統一しているが、合成ゴムに限定するものではなく、天然ゴムを用いることもでき、天然ゴムを用いる場合の単位ｄｔｅｘとは、当該ｄｔｅｘの合成ゴムと同等のＳＳカーブを有する天然ゴムの太さ（例：ウエスト部弾性部材２４に天然ゴムを用いる場合は０．５ｍｍ〜３．０ｍｍ）を意味するものである。
・外装シート２０
素材：不織布
坪量：３０〜７５ｇ／ｍ2、特に３６〜６０ｇ／ｍ2
・前身頃Ｆ及び後身頃Ｂのウエスト部弾性部材２４
太さ：３１０〜１，２４０ｄｔｅｘ、特に９４０〜１，２４０ｄｔｅｘ
Specifically, in the illustrated example, it is preferable to define the specifications of each part within the following range. Although the unit of thickness of the elastic member is unified to dtex, it is not limited to synthetic rubber, and natural rubber can be used. The unit dtex when natural rubber is used is the synthesis of the dtex. This means the thickness of natural rubber having an SS curve equivalent to that of rubber (eg, 0.5 mm to 3.0 mm when natural rubber is used for the waist elastic member 24).
・ Exterior sheet 20
Material: Non-woven fabric Basis weight: 30-75 g / m 2 , especially 36-60 g / m 2
-Waist elastic member 24 of front body F and back body B
Thickness: 310 to 1,240 dtex, especially 940 to 1,240 dtex
本数：５〜１０本、特に８〜１０本（各身頃）
間隔：０〜１０ｍｍ、特に３〜５ｍｍ
固定時の伸長率：１８０〜３５０％、特に２２０〜３００％
・前身頃Ｆ及び後身頃Ｂの腰回り部弾性部材２５
太さ：３１０〜１，２４０ｄｔｅｘ、特に４７０〜６２０ｄｔｅｘ
本数：６〜２６本、特に８〜１６本
間隔：５〜４０ｍｍ、特に１５〜３５ｍｍ
固定時の伸長率：１８０〜３５０％、特に２５０〜３００％
・腹側湾曲弾性部材２８（臀裂対向部に位置する部分も含む）
太さ：４７０〜１，２４０ｄｔｅｘ、特に６２０〜９４０ｄｔｅｘ
本数：３〜１０本、特に５〜１０本
間隔：１０〜３５ｍｍ、特に１６〜３２ｍｍ
固定時の伸長率：１８０〜３８０％、特に２８０〜３８０％で且つ背側湾曲弾性部材２６より高い伸長率
・背側湾曲弾性部材２６（臀裂対向部に位置する部分も含む）
太さ：４７０〜１，２４０ｄｔｅｘ、特に６２０〜９４０ｄｔｅｘ
本数：３〜１０本、特に５〜１０本
間隔：１０〜３５ｍｍ、特に１６〜３２ｍｍ
固定時の伸長率：２００〜３５０％、特に２５０〜３００％
Number: 5-10, especially 8-10 (each body)
Spacing: 0-10 mm, especially 3-5 mm
Elongation rate when fixed: 180-350%, especially 220-300%
The waist elastic member 25 of the front body F and the back body B
Thickness: 310-1,240 dtex, especially 470-620 dtex
Number: 6-26, especially 8-16 Interval: 5-40 mm, especially 15-35 mm
Elongation rate when fixed: 180-350%, especially 250-300%
-Ventral curved elastic member 28 (including the part located in the crack-opposing part)
Thickness: 470-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate at the time of fixation: 180 to 380%, especially 280 to 380%, and higher elongation rate than the dorsal curved elastic member 26-Dorsal curved elastic member 26 (including a portion located at the crack-opposing portion)
Thickness: 470-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
（弾性部材の固定のための接着剤塗布パターンについて）
ウエスト部弾性部材２４、腰回り弾性部材２５及び湾曲弾性部材２６，２８は、外装シート２０を構成する一対のシート層２０Ａ，２０Ｂの間に挟まれるとともに、それらシート層２０Ａ，２０Ｂに対して接着剤により接着固定されており、その接着剤塗布量は外装シート２０の柔軟性を大きく左右する。よって、図７に示すように、その接着剤による接着部分Ｂ１，Ｂ２は、ウエスト部弾性部材２４の配置部分及びその近傍、腰回り弾性部材２５の配置部分及びその近傍、湾曲弾性部材２６〜２８の配置部分及びその近傍領域のみとし、これらの接着剤以外には両シート層間に接着剤を塗布しないようにするのが好ましい。このように、接着剤塗布部分を可能な限り低減することにより、接着剤による硬質化を各段に抑制することができる。しかも、これと前述の腰回り弾性部材２５の局所的間隔増大とが組み合わさると、予想以上の柔軟性向上効果が得られる。
図７は、製造工程におけるホットメルト接着剤の塗布部位２４Ｂ，２５Ｂ，Ｂ１，Ｂ２を示しており、湾曲弾性部材２６〜２８は二点鎖線で示されるように内装体１０を横切る部分の切断前の状態を示している。ウエスト部弾性部材２４及び腰回り弾性部材２５を両シート層２０Ａ，２０Ｂに固定するための接着剤２４Ｂ，２５Ｂは、実質的に各弾性部材２４，２５の配置部位及びその近傍にのみ塗布されている。このような接着剤の塗布は、外周面に接着剤を塗布した弾性部材２４，２５を両シート層２０Ａ，２０Ｂで挟むことにより実現することができ、そのような弾性部材２４，２５の外周面への接着剤の塗布はノードソン社のシュアラップノズルにより行うことができる。
一方、湾曲弾性部材２６〜２７を両シート層２０Ａ，２０Ｂに固定するための接着剤は、矩形の接着剤塗布部分Ｂ１，Ｂ２が湾曲弾性部材２６〜２７の湾曲方向に沿って階段状に並設されることにより、湾曲弾性部材２６〜２７の長手方向全体にわたり、湾曲弾性部材２６〜２７の配置部分及びその近傍の領域にのみ接着剤が塗布されている。このような接着剤の塗布は、塗布工程においてシート層２０Ａ，２０Ｂの横方向（おむつの幅方向）がラインＭＤ方向（流れ方向）に沿う通常の形態では、ラインＣＤ方向（ＭＤ方向と交差する方向）に複数のスロット塗布ノズルを並設し、各ノズルから独立的かつ間欠的に接着剤を塗布することにより行うことができる。
(About the adhesive application pattern for fixing elastic members)
The waist elastic member 24, the waist elastic member 25, and the curved elastic members 26 and 28 are sandwiched between a pair of sheet layers 20A and 20B constituting the exterior sheet 20, and are bonded to the sheet layers 20A and 20B. The amount of adhesive applied greatly affects the flexibility of the exterior sheet 20. Therefore, as shown in FIG. 7, the adhesive portions B <b> 1 and B <b> 2 by the adhesive include the arrangement portion of the waist elastic member 24 and the vicinity thereof, the arrangement portion of the waist elastic member 25 and the vicinity thereof, and the curved elastic members 26 to 28. It is preferable that only the arrangement portion and the vicinity thereof are used, and other than these adhesives, no adhesive is applied between the sheet layers. In this way, by reducing the adhesive application portion as much as possible, hardening by the adhesive can be suppressed at each stage. In addition, when this is combined with the increase in the local spacing of the waist elastic member 25 described above, a greater flexibility improvement effect than expected can be obtained.
FIG. 7 shows the hot melt adhesive application sites 24B, 25B, B1, and B2 in the manufacturing process, and the curved elastic members 26 to 28 are before cutting the portion that crosses the interior body 10 as shown by the two-dot chain line. Shows the state. Adhesives 24B and 25B for fixing the waist elastic member 24 and the waist elastic member 25 to the two sheet layers 20A and 20B are substantially applied only to the positions where the elastic members 24 and 25 are disposed and in the vicinity thereof. . Such application of the adhesive can be realized by sandwiching the elastic members 24 and 25 having the adhesive applied to the outer peripheral surface between the two sheet layers 20A and 20B, and the outer peripheral surfaces of such elastic members 24 and 25. The adhesive can be applied to a Nordson Surerup nozzle.
On the other hand, as for the adhesive for fixing the curved elastic members 26 to 27 to the two sheet layers 20A and 20B, the rectangular adhesive application portions B1 and B2 are arranged stepwise along the bending direction of the curved elastic members 26 to 27. By being provided, the adhesive is applied only to the arrangement portion of the curved elastic members 26 to 27 and the vicinity thereof over the entire longitudinal direction of the curved elastic members 26 to 27. In the application process, in the normal form in which the lateral direction (diaper width direction) of the sheet layers 20A and 20B is along the line MD direction (flow direction) in the application process, the adhesive layer crosses the line CD direction (MD direction). In the direction), a plurality of slot coating nozzles are arranged in parallel, and the adhesive can be applied independently and intermittently from each nozzle.
（内装体と外装シートとの固定）
内装体１０と外装シート２０との固定領域８１，８２，８３は特に限定されないが、図３に示すように、前後方向中間部よりもその前後両側の部分の幅が広い括れ形状とし、かつこの固定領域における前側の幅の広い部分８１の前後方向長さが、後側の幅の広い部分８３の前後方向長さよりも長い形状とするのが好ましい。このように内装体１０の前側の固定領域８１を広い幅で前後方向に長く形成することで、本発明の腹側への引張作用がより一層のものとなる。また、本発明の腹側への引張作用により臀裂対向部が腹側に引っ張られると、内装体１０の前側の形状が不適切に変形するおそれがあるが、このように内装体１０の前側の固定領域８１を広い幅で前後方向に長く形成することで、内装体１０前側の不適切な変形を防止することができる。
各部の寸法は適宜定めることができるが、通常の場合、固定領域における前側の幅の広い部分８１の幅及び前後方向長さは、それぞれ内装体１０の幅の８５〜１００％及び内装体１０の全長の４０〜６０％程度とすることができ、後側の幅の広い部分８３の幅及び前後方向長さは、それぞれ内装体１０の幅の８５〜１００％及び内装体１０の全長の１０〜３０％程度とすることができる。特に、後側の幅の広い部分８３の前端は臀裂対向部よりも後側に位置しているのが好ましい。
(Fixing the interior and exterior sheets)
The fixing regions 81, 82, 83 between the interior body 10 and the exterior sheet 20 are not particularly limited, but as shown in FIG. It is preferable that the length in the front-rear direction of the wide portion 81 on the front side in the fixed region is longer than the length in the front-rear direction of the wide portion 83 on the rear side. Thus, by forming the fixing region 81 on the front side of the interior body 10 long in the front-rear direction with a wide width, the tensioning action on the ventral side of the present invention is further enhanced. In addition, when the fracture facing portion is pulled to the ventral side due to the pulling action on the ventral side of the present invention, the shape of the front side of the interior body 10 may be inappropriately deformed. By forming the fixed region 81 with a wide width in the front-rear direction, inappropriate deformation on the front side of the interior body 10 can be prevented.
Although the dimensions of each part can be determined as appropriate, in the normal case, the width of the front wide portion 81 and the length in the front-rear direction in the fixed region are 85 to 100% of the width of the interior body 10 and the interior body 10 respectively. The width of the wide portion 83 on the rear side and the length in the front-rear direction are 85 to 100% of the width of the interior body 10 and 10 to 10% of the entire length of the interior body 10, respectively. It can be about 30%. In particular, it is preferable that the front end of the wide portion 83 on the rear side is located on the rear side of the crack-opposing portion.
（前後押えシート）
図１及び図４にも示されるように、外装シート２０の内面上に取り付けられた内装体１０の前後端部をカバーし、且つ内装体１０の前後縁からの漏れを防ぐために、前後押えシート５０，６０が設けられている。図示形態について更に詳細に説明すると、前押えシート５０は、前身頃Ｆ内面のうちウエスト側端部の折り返し部分２０Ｃの内面から内装体１０の前端部と重なる位置まで幅方向全体にわたり延在しており、後押えシート６０は、後身頃Ｂ内面のうちウエスト側端部の折り返し部分２０Ｃの内面から内装体１０の後端部と重なる位置まで幅方向全体にわたり延在している。前後押えシート５０，６０の股下側縁部に幅方向の全体にわたり（中央部のみでも良い）若干の非接着部分を設けると、接着剤が食み出ないだけでなく、この部分を表面シートから若干浮かせて防漏壁として機能させることができる。
図示形態のように、前後押えシート５０，６０を別体として取り付けると、素材選択の自由度が高くなる利点があるものの、資材や製造工程が増加する等のデメリットもある。そのため、外装シート２０をおむつ１内面に折り返してなる折り返し部分２０Ｃを、吸収パッド２００と重なる部分まで延在させて、前述の押えシート５０，６０と同等の部分を形成することもできる。
(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 attached on the inner surface of the exterior sheet 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 are provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion to the position overlapping the front end portion of the interior body 10 in the inner surface of the front body F. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.
When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior sheet 20 on the inner surface of the diaper 1 can be extended to a portion overlapping the absorbent pad 200 to form a portion equivalent to the presser sheets 50 and 60 described above.
本発明は、パンツタイプ使い捨ておむつにおいて利用できるものである。 The present invention can be used in a pants-type disposable diaper.
１…パンツタイプ使い捨ておむつ、１０…内装体、１１…液透過性表面シート、１２…液不透過性裏面側シート、１３…吸収体、１４…包装シート、１５…ギャザー不織布、１６…糸状弾性伸縮部材、２０…外装シート、２１，２２…側部接合縁、２４…ウエスト部弾性部材、２５…腰回り弾性部材、２６…背側湾曲弾性部材、２７…腰回り湾曲弾性部材、２８…腹側湾曲弾性部材、２９…脚回りライン、２０Ｃ…外装シート折り返し部、４０…屈曲フィット部、８１，８２，８３…固定領域、Ｆ…前身頃、Ｂ…後身頃。 DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper, 10 ... Interior body, 11 ... Liquid-permeable surface sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Yarn-like elastic stretch 20 ... exterior sheet, 21, 22 ... side joint edge, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... back curved elastic member, 27 ... waist curved elastic member, 28 ... ventral side Curved elastic member, 29 ... leg circumference line, 20C ... exterior sheet folded portion, 40 ... bent fit portion, 81, 82, 83 ... fixed region, F ... front body, B ... back body.
Claims (8)
前身頃の右のサイドシール部から前身頃の右のレッグ開口部に沿って股間部における右側部に至り、股間部における右側部から更に幅方向中央側に向かいつつ後側に向かうように湾曲して後身頃の幅方向中央部に位置する臀裂対向部に至り、臀裂対向部において前側に折り返され、更に左側に向かいつつ前側に向かうように湾曲して股間部の左側部に至り、股間部における左側部から前身頃の左のレッグ開口部に沿って前身頃の左のサイドシール部に至る；細長状の腹側湾曲弾性部材が、その長手方向に所定の伸長率で伸長された状態で固定されており、
前記後身頃における臀裂対向部に、幅方向に収縮して装着者の臀裂に入り込むように折れ曲がる屈曲フィット部が設けられるとともに、
前記腹側湾曲弾性部材によって、少なくとも前身頃から後身頃の臀裂対向部の側方までの左右のレッグ開口部に沿う部分に収縮力が作用するように構成されている、
ことを特徴とするパンツタイプ使い捨ておむつ。 An exterior sheet that forms a front body and a back body, and an interior body including an absorbent body that is fixed to an inner surface of the exterior sheet, and both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body In the pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by forming a side seal part by joining each of
From the right side seal part of the front body to the right leg part of the crotch part along the right leg opening part of the front body, it curves so as to go to the rear side while going further from the right side part of the crotch part toward the center in the width direction. To the crack facing part located in the center of the rear body in the width direction, folded back to the front side at the crack facing part, and further curved toward the front side toward the left side to reach the left side part of the crotch part. From the left side of the front part to the left side seal part of the front body along the left leg opening of the front body; the elongated ventral curved elastic member is stretched at a predetermined elongation rate in the longitudinal direction It is fixed with
A bending fit portion that is bent so as to contract in the width direction and enter the wearer's crack is provided at the crack facing portion in the back body,
The ventral curved elastic member is configured such that a contractile force acts on a portion along the left and right leg openings from at least the front body to the side of the crack facing portion of the back body,
A pants-type disposable diaper characterized by that.
この背側湾曲弾性部材によって、少なくとも後身頃における前記臀裂対向部の側方までの左右のレッグ開口部に沿う部分に収縮力が作用するように構成されており、かつ
前身頃における縦方向の弾性変形時引張応力が、後身頃における縦方向の弾性変形時引張応力よりも大きい、請求項１記載のパンツタイプ使い捨ておむつ。 From the right side seal part of the back body toward the front side along the right leg opening of the back body, and further to the left side of the back body, the direction opposite to the crack is crossed in the width direction from right to left. To the left side seal part of the back body along the leg opening of the body; an elongated dorsal curved elastic member is fixed in a state of being stretched at a predetermined elongation rate in the longitudinal direction;
By this dorsal curved elastic member, it is configured such that a contracting force acts on at least a portion along the left and right leg openings up to the side of the crack facing portion in the back body, and in the longitudinal direction in the front body The pants-type disposable diaper according to claim 1, wherein the tensile stress at the time of elastic deformation is larger than the tensile stress at the time of elastic deformation in the rear body.
前記外装シートの坪量は３０〜７５ｇ／ｍ2であり、
前記前身頃及び後身頃におけるウエスト部弾性部材は、それぞれ、太さ３１０〜１２４０ｄｔｅｘ、本数が５〜１０本、間隔が０〜１０ｍｍ、及び固定時の伸長率が１８０〜３５０％であり、
前記前身頃及び後身頃における腰回り部弾性部材は、それぞれ、太さ３１０ｄｔｅｘ、本数が６〜２６本、間隔が５〜４０ｍｍ、及び固定時の伸長率が１８０〜３５０％であり、
前記腹側湾曲弾性部材は、太さ４７０〜１，２４０ｄｔｅｘ、本数が３〜１０本、間隔が１０〜３５ｍｍ、及び固定時の伸長率が２３０〜３８０％で且つ前記背側湾曲弾性部材より高い伸長率であり、かつ
前記背側湾曲弾性部材は、太さ４７０〜１，２４０ｄｔｅｘ、本数が３〜１０本、間隔が１０〜３５ｍｍ、及び固定時の伸長率が２００〜３５０％である、、
請求項５記載のパンツタイプ使い捨ておむつ。 The exterior sheet is composed of a plurality of non-woven fabrics bonded together with an adhesive at a portion having at least the waist elastic member, waist elastic member, ventral curved elastic member and dorsal curved elastic member. The waist elastic member, the waist elastic member, the ventral curved elastic member and the dorsal curved elastic member are clamped and fixed,
The basis weight of the exterior sheet is 30 to 75 g / m 2 ,
The waist elastic members in the front body and the back body have a thickness of 310 to 1240 dtex, a number of 5 to 10, a distance of 0 to 10 mm, and an elongation rate of 180 to 350% when fixed,
The waist elastic members in the front body and the back body have a thickness of 310 dtex, a number of 6 to 26, a distance of 5 to 40 mm, and an elongation rate of 180 to 350% when fixed,
The ventral curved elastic member has a thickness of 470 to 1,240 dtex, a number of 3 to 10, a distance of 10 to 35 mm, and an elongation rate when fixed of 230 to 380%, which is higher than the dorsal curved elastic member. And the dorsal curved elastic member has a thickness of 470 to 1,240 dtex, a number of 3 to 10, a distance of 10 to 35 mm, and an elongation rate of 200 to 350% when fixed.
The pants-type disposable diaper according to claim 5.
前記腹側湾曲弾性部材の軌跡の後端部と前記背側湾曲弾性部材の軌跡の前端部とが前後方向に離間しており、
前記ギャザー弾性部材のうち前記内装体の側方から裏側までの部位に位置するものが、前記腹側湾曲弾性部材と内装体の側縁とが交差する位置から、前記背側湾曲弾性部材と内装体の側縁とが交差する位置まで延在している、
請求項３〜６のいずれか１項に記載のパンツタイプ使い捨ておむつ。 Three-dimensional gathers are provided on both sides of the interior body so as to protrude from the back side of the side of the interior body to the front side and project to the front side of the interior body. The elongated gather elastic member extending along the front-rear direction is fixed to each of the parts from the back side to the back side in a state of being elongated at a predetermined elongation rate in the longitudinal direction,
The rear end portion of the locus of the ventral curved elastic member and the front end portion of the locus of the dorsal curved elastic member are separated in the front-rear direction.
Among the gathered elastic members, those located in the region from the side to the back side of the interior body are arranged so that the dorsal curved elastic member and the interior are located from the position where the abdomen curved elastic member and the side edge of the interior body intersect. Extending to the position where the side edges of the body intersect,
The pants-type disposable diaper according to any one of claims 3 to 6.
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