1298632 (1) 九、發明說明 【發明所屬之技術領域】 本發明，係關於藉由將前身片之側緣與後身片之側緣 予以重疊並接合而形成之短褲型用後即棄式紙尿褲，特別 是，有關兼具優良穿著感及高接合強度之短褲型用後即棄 式紙尿褲。 【先前技術】 近年，用後即棄式紙尿褲之品質飛躍性提升，乳幼兒 大多穿著用後即棄式紙尿褲。作爲用後即棄式紙尿褲者， 存在有具備有帶片的形態（帶片型）及呈短褲形狀的形態 (短褲型）之二種類。帶片型之用後即棄式紙尿褲，爲將 腰圍二處用帶片固定者，以較低月齡之乳兒爲對象。另一 方面，短褲型之用後即棄式紙尿褲，爲如內褲之短褲般地 一體成形，可直接在站立狀態下穿著者，以1歲〜3歲之 幼兒爲對象。 此等用後即棄式紙尿褲，由於爲直接接觸於乳幼兒的 纖細敏感之肌膚者，故須要求爲肌膚觸感優異之穿著感良 好者。因此，作爲更柔，更薄，且更輕之材料，而使用了 低基重之不織布的用後即棄式紙尿褲之開發一直在進步。 然而，短褲型之用後即棄式紙尿褲，通常，爲藉由將 紙尿褲本體之前身片的側緣與後身片的側緣予以重疊並接 合而形成。如此之短褲型用後即棄式紙尿褲，爲了在幼兒 穿著之際或於該裝著中不使接合被解開，必須有一定以上 -4- (2) (2)1298632 之接合強度。此點，於使用了低基重的不織布之紙尿褲， 正因其爲低基重’故與高基重之不織布比較，其接合強度 較差。因此’優良穿著感與高接合強度之並存成爲課題。 關於此點’揭示有針對於具備有透液性表面薄片；及 不透液性背面薄片；以及夾介於此等兩薄片間之吸液性芯 片’並藉由使從前後身片的吸液性芯片之左右各側緣朝向 外側延伸而出之側翼部分以合掌狀重疊且熔著，而一體化 地形成之短褲型用後即棄式紙尿褲，於形成側翼部分之背 面薄片的外面，配置融點比背面薄片還高之覆蓋薄片，而 將側翼部分的外側緣與覆蓋薄片一同熔著之技術（參照專 利文獻1 )。根據該短褲型用後即棄式紙尿褲，其熔著部 之表面不會粗糙而刺激到穿著者之肌膚。 又’作爲揭示於專利文獻1之短褲型用後即棄式紙尿 褲的改良技術，揭示有將在側翼部分的表背面薄片之至少 一方，藉由朝向表背面薄片之面方向接合的薄片構件來構 成’將熔著的部分之背面薄片側作成融點比表面薄片側還 局之薄片而予以熔著的技術（參照專利文獻2)。根據該 短褲型用後即棄式紙尿褲，熔著部之表面不會變得粗糙而 刺激到穿著者之肌膚，而且不會損害紙尿褲之外觀。 〔專利文獻1〕 日本特開平6-327713號公報 〔專利文獻2〕 日本特開平6-327714號公報 【發明內容】 〔發明所欲解決之技術問題〕 -5- (3) 1298632 然而，揭示於此等專利文獻之技術， 薄片材料，並非爲以使用了低基重的材料 ^ 提的技術。又，其爲改善熔著部的肌膚觸 ^ ，並非爲以優良穿著感及高接合強度之並 ~ 本發明，爲鑑於上述般之課題者，其 供一種兼具優良穿著感與高接合強度之短 一 紙尿褲。 〔解決問題之技術手段〕 本發明者等，爲了解決上述課題而專 。其結果，使用了低基重的不織布作爲背 分別將腰側的接合部及腿側的接合部之合 定的範圍內，發現可以解決上述課題，而 成。更具體地，本發明爲提供如下述般者 (1) 爲具備短褲狀的紙尿褲本體 φ 裝著於穿著者身體的腰部開口部；及裝著 一封腿部開口部；及位於穿著者腹側的前 著者背側的後身片；以及其上述前身片的 _ 身片的兩側緣被相互重疊接合而形成且從 朝下方延伸直至上述腿部開口部的一對接 用後即棄式紙尿褲，上述紙尿褲本體，爲 外形之基重爲20g/m2以下的不透液性不 面薄片；及配置於該背面薄片內側並通過 彼此間而從上述前身片至上述後身片之由 必須爲高融點之 之紙尿褲作爲前 感爲主要目的者 存爲目的者。 目的，係在於提 褲型用後即棄式 心一意一再硏究 面薄片，並藉由 計基重設定於預 使本發明臻於完 〇 ，該本體具有： 於穿著者腿部的 身片；及位於穿 兩側緣與上述後 上述腰部開口部 合部，之短褲型 具備有：由形成 織布所構成的背 上述腿部開口部 透液性不織布所 -6- (4) 1298632 構成之大致呈帶狀的表面薄片；及配置於該表面薄片與上 述背面薄片之間並吸收體液之大致呈帶狀的吸收性芯片； 以及配置於上述表面薄片之兩側面且接合於上述背面薄片 ，形成上述前身片與上述後身片的兩側緣之由不透液性不 織布所構成的側邊薄片，於上述一對接合部中，位於上述 腰部開口部側的一對腰側接合部分別之合計基重，爲在 78g/m2以上120g/m2以下，且，於上述一對接合部中，位 於上述腿部開口部側的一對腿側接合部分別之合計基重， 爲在65g/m2以上100g/m2以下之短褲型用後即棄式紙尿 褲。 (1 )之短褲型用後即棄式紙尿褲，由於爲使用 2 Og/m2以下之低基重的不織布作爲紙尿褲背面薄片，故軟 柔質輕，穿著感優良。構成背面薄片的不織布之基重若超 過20g/m2，則不能言其爲低基重，不能製得比以往更柔 軟質輕且穿著感良好之紙尿褲。再者，由於其爲將腰側接 合部之合計基重設定於78g/m2以上120g/m2以下，而腿 側接合部之合計基重設定於65g/m2以上l〇〇g/m2以下者 ，故雖使用低基重之不織布作爲背面薄片，接合部之接合 強度亦優秀。因此，根據本發明，可提供一種兼具優良穿 著感及高接合強度之短褲型用後即棄式紙尿褲。 作爲將腰側接合部及腿側接合部之合計基重設定於上 述範圍內之手段者，並無特別限定。例如，亦可將腰側接 合部之背面薄片以及腿側接合部之背面薄片，使用不同材 料形成。又，亦可於腰側接合部，將背面薄片翻折於紙尿 (5) (5)1298632 褲本體內側後再接合，或於腿側接合部，在側邊薄片與背 面薄片之間插入不同之薄片狀材料再予以接合。 (2 ) 如（1 )所記載之短褲型用後即棄式紙尿褲 ，其中上述一對腰側接合部，爲設置於從上述腰部開口部 朝下方25mm以內之區域，上述一對腿側接合部，爲設置 於從上述腿部開口部朝上方25mm以內之區域。 (2 )之短褲型用後即棄式紙尿褲，爲將從腰部開口 部朝下方25mm以內之區域的合計基重設定於78g/m2以 上120g/m2以下，而將從腿部開口部朝上方25mm以內之 區域的合計基重設定於65g/m2以上100g/m2以下之紙尿 褲。亦即，其爲調整了最需要高接合強度的部位之基重， 而將接合強度設定於一定程度以上者。因此，可提供能持 續確保更良好之穿著感，並具備有高接合強度的紙尿褲。 (3 ) 如（1 )或（2 )所記載之短褲型用後即棄式 紙尿褲，其中構成上述背面薄片的不織布之纖維粗度，爲 在0.8dtex以上1.5dtex以下。 (3 )之短褲型用後即棄式紙尿褲，爲將構成背面薄 片之纖維粗度設定於〇_8dtex以上1.5dtex以下之紙尿褲 。亦即，其爲藉由使用由比以往之一般不織布的纖維還細 之纖維所構成的不織布作爲背面薄片，其肌膚觸感良好， 爲穿著感優良的紙尿褲。纖維粗度若比0.8dtex更細時， 則無法得到必須之接合強度。又，由於其爲低基重，故會 產生基重不均。另一方面，纖維粗度若比1 .5dt ex更粗時 ，則無法得到穿著感優良的紙尿褲。又，由於其爲將腰側 -8 - (8) 1298632 關本實施形態之短褲型用後即棄式紙尿褲1〇()，將 190分離成前身片101及後身片1〇2時之展開平面 於第3圖。有關本實施形態之短褲型用後即棄式 100，爲具備有短褲形狀之紙尿褲本體110。 〔紙尿褲本體1 1 0〕 紙尿褲本體110，爲具備有：裝著於穿著者身 部開口部1 2 0 ;及裝著於穿著者腿部的一對腿部 1 3 0 ;及位於穿著者腹側的前身片1 〇 i ;及位於穿 側的後身片1 0 2 ;以及其前身片1 〇〗之兩側緣與 1 02之兩側緣互相重疊並接合而形成，且從腰部 1 2 0朝下方延伸直至腿部開口部丨3 〇的一對接合部 又，紙尿褲本體1 1 〇，爲具備有：由形成外形 爲2Og/m2以下的不透液性不織布所構成的背面薄片 及配置於該背面薄片1 1 2之內側且通過腿部開口部 此間而從前身片1 0 1至後身片1 02之由透液性不織 成的大致呈帶狀之表面薄片111;及配置於該表 1 1 1與背面薄片1 1 2間並吸收體液之大致呈帶狀的 芯片1 8 0 ;以及配置於表面薄片1 1 1之兩側面並接 面薄片112，且形成前身片1〇1及後身片1〇2的兩 由不透液性不織布所構成的側邊薄片1 1 4。此等背 1 1 2、表面薄片1 1 1、側邊薄片1 1 4，以及吸收性芯 ，爲使用熱密封、超音波密封，或熱熔接著劑等適 合一起。又，於表面薄片1 1 1之兩側部與側邊薄片 接合部 圖顯示 紙尿褲 體的腰 開口部 著者背 後身片 開口部 190。 之基重 ‘112; 130彼 布所構 面薄片 吸收性 合於背 側緣之 面薄片 片 180 當地接 1 14之 -11 · (9) (9)1298632 間’以配置有於自由端部具備彈性構件並會立起之不透液 性立體糟邊爲理想（圖示省略）。又，亦可於紙尿褲本體 1 1 〇之兩側部或後身片1 02，設置處理丟棄紙尿褲用之固 定黏著用帶片（圖示省略），於前身片1〇1或後身片1〇2 ’亦可標示圖案等。 紙尿褲本體110’具備有沿著腿部開口部13〇之周緣 ，而從前身片1 0 1側，通過腿部開口部丨3 〇之上部，至後 身片1 02側，以曲線狀延伸之複數條彈性構件1 7〇。又， 紙尿褲本體110’於前身片101及後身片i 〇2之一部分具 備有具有伸縮性之伸縮繩107，藉由該伸縮繩1〇7在伸長 狀態下裝著於穿著者身上，可緊密接著於穿著者之身體。 再者’於紙尿褲本體1 1 0，具備有複數條沿著腰部開口部 120延伸的腰帶109。腰帶109，爲與腰部開口部12〇之 邊緣大致平行。伸縮繩107，以成爲大致與腰帶1〇9平行 之方式，設置於前身片1 0 1及後身片1 02之兩側部，並大 致直線延伸於紙尿褲本體1 1 0之寬幅方向。伸縮繩1 〇7及 腰帶109’爲設置於背面薄片112與側邊薄片114之間， 並在伸長之狀態下藉由熱熔被接合一起。此等彈性構件 170、腰帶109，以及伸縮繩107，只要爲伸縮自在之具有 彈性者，則無特別限制。例如，可使用天然橡膠、合成橡 膠、聚氨基甲酸乙酯製之線狀橡膠、平板橡膠、帶狀橡膠 、熱收縮性材料、吸水收縮性纖維等各種材料。 〔背面薄片1 1 2、側邊薄片1 1 4〕 12- (10) (10)1298632 作爲構成此等背面薄片1 1 2及側邊薄片1 1 4之薄片者 ，爲了確保耐液性、優良之肌膚觸感，以及通氣性，例如 ，除了聚丙烯製等的紡黏不織布、由聚乙烯、聚丙烯、聚 對苯二甲酸乙酯等之纖維所構成的氣流不織布、噴網不織 布等以外，其他亦可採用含有人造橡膠或聚合物之具備有 伸縮性或伸長性的不織布或伸縮性薄膜之複合薄片。再者 ，亦可使用不透水性之塑膠薄膜，或是，將此等互相貼合 之薄片。塑膠薄膜，於塡充料混入之後，藉由延伸，可確 保通氣性、透濕性。 作爲不織布者，除了由聚烯烴系、聚酯系、或聚醯胺 系等纖維所形成的芯鞘型複合纖維以外，還可使用由並列 型複合纖維所構成的不織布。又，不織布之製造方法並沒 有特別限定，亦可使用藉由紡黏、點黏、氣流黏合、化學 非織物熱熔、熔噴、噴網，或是針軋等之方法所製造之並 列型複合纖維。 特別是，背面薄片1 1 2，爲防止被吸收性芯片所吸收 的排泄物朝向外側漏出者，須採用上述之不織布之施有撥 水處理者。藉由將背面薄片1 1 2，作成透濕性材料，可減 低裝著時之悶濕，消除不適感。作爲如此之材料者，例如 ，除了將合成樹脂膜化之薄片狀薄膜、充塡無機塡充料並 藉由施以延伸處理而製得之通氣薄膜以外，亦可使用將紙 與不織布予以複合之層壓布、具備有10%〜3 0%之開孔且 孔徑在〇· 1mm〜0.6mm之範圍內並藉由使毛細管朝向吸收 性體側地配置而製得之通氣性液體阻隔薄片等。較佳爲， -13- (11) (11)1298632 以使其產生如布般之外觀地施以壓花加工的熱加工性薄膜 〇 又，於本實施形態所採用之背面薄片1 1 2，爲由低基 重的不織布所形成。具體上，構成背面薄片1 1 2的不透液 性不織布的基重，爲設定在20g/m2以下之範圍內。又， 構成背面薄片112的不織布之纖維粗度，爲設定在 0.8dtex以上1.5dtex以下之範圍內。藉此，可得到柔軟質 輕且穿著感優良的紙尿褲。 於本實施形態，不織布的基重之測量方法如下。首先 ，將用來測量之不織布正確裁切成lOOmmxlOOmm，裁切 下之不織布用電子天坪測量質量至小數點以下第4位。然 後，藉由使用以下數式計算，求出基重。 〔數式1〕 基重（g/m2)=試料之質量（g)+ {(試料縱向之長度（mm) / 1 000 ) x(試料橫向之長度（mm)/l〇〇〇) } 又，於本實施形態，作爲背面薄片1 1 2，由於使用低 基重且纖維徑較細的不織布，故易於產生基重不均，產生 基重不均的不織布，性能與外觀均不理想。因此，於本實 施形態，如下述般測量出來的基重C V値以在2 %〜6 %之 範圍內爲理想。只要於該範圍內，則可製得性能與外觀皆 良好的不織布。 於本實施形態，基重CV値爲如下述般求出。首先， -14- (12) (12)1298632 將不織布正確裁切成50mmxl000mm，測量裁切下來之不 織布的質量，並藉由上述之方法換算基重。然後，求出裁 切片之在短邊方向的基重之平均値標準偏差，藉由以平均 値除以標準偏差再乘以1 00而求得CV値（％ )。 〔表面薄片1 1 1、吸收性芯片1 8 0〕 作爲表面薄片1 1 1者，以不刺激肌膚的材料爲理想， 可採用親水性之不織布。在此所謂之不織布，爲藉由紡黏 、噴網、針軋、熔噴、熱熔、化學非織物熱熔、氣流等之 製法所製造者。作爲不織布者，可使用與背面薄片112或 側邊薄片1 1 4相同者。又，亦可使用嫘縈、醋酸酯、棉質 、紙漿，或是，單獨使用合成樹脂或以形成芯鞘構造之方 式予以複合的纖維狀薄片。 作爲吸收性芯片1 80者，較佳爲採用將解纖紙漿及高 吸水性聚合物予以倂用者，此外採用將纖維素纖維、熱可 塑性樹脂、高吸水性聚合物、熱熔著性纖維等予以混合並 施以熱處理者亦理想。又’若爲積層複數層者時，高吸水 性聚合物之存在位置，可爲上層、中層、下層之任一層， 又’亦可爲與紙漿混合者。高吸水性聚合物，以具備有能 吸收保持本身重量之2 0倍以上的液體之性能，並具備有 凝膠化之性質者爲理想。作爲如此之高分子吸水聚合物者 ，可舉澱粉-丙烯酸（鹽）接枝共聚物、澱粉一丙烯脛共 聚物之皂化物、羧甲基纖維素鈉之交聯物、丙烯酸（鹽） 聚合物等。 15- (13) (13)1298632 〔腰側接合部1 9 1、腿側接合部1 92〕 於本實施形態之一對接合部1 90，爲具備有位於腰部 開口部1 20側之腰側接合部1 9 1，以及位於腿部開口部 1 3 0側之腿側接合部1 92。於本實施形態，以腰側接合部 191，爲從腰部開口部120起朝下方25mm以內的區域， 而腿側接合部192，爲從腿部開口部130起朝上方25mm 以內的區域爲理想。 將有關本實施形態之短褲型用後即棄式紙尿褲1 00之 接合部190，從側面觀察時之放大斷面圖顯示於第4圖。 不過，於第4圖，爲了簡化，省略了沿著腰部開口部120 的邊緣設置之腰帶109。如第4圖所示，於本實施形態， 一對接合部190，爲背面薄片112及側邊薄片114所積層 而形成。於腰側接合部1 9 1，背面薄片1 1 2爲被翻折於紙 尿褲本體1 1 〇之內側後再接合。因此，腰側接合部1 9 1， 是由4朦背面薄片112，以及2層側邊薄片114之共計6 層所積層而形成。又，腿側接合部1 92，是由2層背面薄 片112，2層側邊薄片114之共計4層所積層而形成。 於本實施形態，腰側接合部191之合計基重設定成在 7 8g/m2以上120g/m2以下的範圍內。亦即，4層背面薄片 112及2層側邊薄片114之共計6層的合計基重設定成在 7 8g/m2以上120g/m2以下的範圍內。藉此，於腰側接合部 1 9 1，可確保高接合強度。又，只要腰側接合部1 9 1之合 計基重在上述之範圍內，則背面薄片1 1 2亦可爲不被翻折 -16- (14) (14)1298632 於紙尿褲本體110之內側而接合者。 又，於本實施形態，腿側接合部1 92之合計基重被設 定成在65g/m2以上100g/m2以下的範圍內。亦即，2層背 面薄片112及2層側邊薄片114之共計4層的合計基重被 設定成在65g/m2以上100g/m2以下的範圍內。藉此，於 腿側接合部1 92，可確保高接合強度。 〈第二實施形態〉 將有關本實施形態之短褲型用後即棄式紙尿褲200之 接合部290，從側面觀察時之放大斷面圖顯示於第5圖。 不過，與第4圖同樣地，於第5圖，亦省略了沿著腰部開 口部22〇的邊緣設置之腰帶209。有關本實施形態之短褲 型用後即棄式紙尿褲200，其特徵爲於一對接合部290中 ，採用含有腰側接合部29 1的腰側，以及含有腿側接合部 2 92的腿側之2種不同種類的背面薄片212a及212b之點 。關於其他之構成，則爲與第一實施形態相同。 更詳之，於接合部290，於含有腰側接合部29 1的腰 側爲採用背面薄片212a，而於含有腿側接合部292的腿 側則採用背面薄片212b。具體上，腰側接合部291及腿 側接合部292之合計基重，分別以成爲在78g/m2以上 120g/m2以下以及65g/m2以上100g/m2以下的範圍內，來 採用基重不同的不織布。又，此等背面薄片212a及背面 薄片212b，亦可爲基重不同之相同種類的不織布。根據 本實施例’可得到與第一實施形態相同之效果。 -17- (15) (15)1298632 〈第三實施形態〉 將有關本實施形態之短褲型用後即棄式紙尿褲3 00之 接合部3 9 0，從側面觀察時之放大斷面圖顯示於第6圖。 不過，與第4及5圖同樣地，於第6圖，亦省略了沿著腰 部開口部320的邊緣設置之腰帶309。又，有關本實施形 態之短褲型用後即棄式紙尿褲300之背面圖顯示於第7圖 。如第6圖所示，有關本實施形態之短褲型用後即棄式紙 尿褲3 0 0，特徵爲在一對接合部3 9 〇中，於形成腿側接合 部392之側邊薄片314與背面薄片312之間，插入有帶狀 的插入薄片313之點。該插入薄片313，如第7圖所示， 爲配置於從腿側接合部3 92朝後身片3 〇2之寬幅方向延伸 預定尺寸之區域內。插入薄片313之配置部位，只要在該 區域內則無特別限定，例如，配置於從腿側接合部3 9 2朝 後身片3 02之寬幅方向延伸直至吸收性芯片3 8 〇的交界附 近之區域。關於此等以外之構成，則爲與第一實施形態相 同。 於本實施形態，由於插入有插入薄片3 1 3，故腿側接 合部3 9 2的合計基重，亦即，以2層側邊薄片3 14、2層 背面薄片312，以及1層插入薄片313之共計5層的合計 基重成爲在65g/m2以上l〇〇g/m2以下之範圍內地，調整 背面薄片312及側邊薄片314之基重。作爲插入薄片313 者，只要腿側接合部392之合計基重成爲在上述之範圍內 者則無特別限定。較佳爲，採用不織布，亦可用塑膠薄膜 -18- (16) 1298632 等。作爲不織布者，可採用使用在如上述之背面薄片312 或側邊薄片314的不織布。藉由插入薄片313之插入，即 使是將低基重的不織布作爲背面薄片3 1 2使用，亦可提高 腿側接合部3 92的接合強度。 〈變形例〉 有關本實施形態之變形例的短褲型用後即棄式紙尿褲 4 00之背面圖顯示於第8圖。有關本變形例之短褲型用後 即棄式紙尿褲400，除了變更了插入薄片413的配置部位 之點以外，其他構成爲與本實施形態相同。具體上，在從 一對腿側接合部492的一方朝向後身片402之寬幅方向延 伸而直至另一方的區域內，配置有插入薄片413。亦即， 於後身片4〇2，從一對腿側接合部492之一方直線狀連續 配置到另一方。藉由本變形例，亦可得到與本實施形態相 同之效果。 〔實施例〕 以下，說明關於本發明之實施例。不過，本發明並非 被限定於以下之實施例者。 〈實施例1〉 作爲實施例1，製造了有關此第一實施形態的短褲型 用後即棄式紙尿褲。具體上，作爲側邊薄片，使用了基重 爲15g/m2，基重CV値爲4%的SMS不織布（紡黏層之纖 -19- (17) (17)1298632 維粗度爲2.2〜2.3dtex(l6〜19//m)，熔噴層之纖維粗 度爲0.04〜0.05dtex(1.9〜2.7//m))。又，作爲背面薄 片’使用了基重爲19g/m2，基重cv値爲7%的紡黏不織 布（纖維粗度爲12〜1.5dtex(13〜16//m))。又，關 於吸收體或彈性構件等之其他構件，則使用以往習知者， 並藉由以往習知之製造方法來製造。 〈實施例2〉 作爲實施例2，製造了有關此第三實施形態的短褲型 用後即棄式紙尿褲。具體上，作爲側邊薄片，使用了基重 爲15g/m2，基重CV値爲4%的SMS不織布（紡黏層之纖 維粗度爲 2.2〜2.3dtex (16〜19//m)，熔噴層之纖維粗 度爲0.04〜0.05dtex(1.9〜2.7//m))。又，作爲背面薄 片，使用了基重爲19g/m2，基重CV値爲7%的紡黏不織 布（纖維粗度爲 1.2〜1.5dtex (13〜16em))。再者， 作爲插入於腿側接合部之插入薄片，使用了由與背面薄片 相同的不織布所構成之帶狀插入薄片。插入薄片，爲配置 於從腿側接合部朝向後身片之寬幅方向延伸而直至吸收性 芯片的交界之區域。又，關於吸收體或彈性構件等之其他 構件，則使用以往習知者’並藉由以往習知之製造方法來 製造。 〈實施例3〉 作爲實施例3，製造了有關此第三實施形態的短褲型 -20- (18) (18)1298632 用後即棄式紙尿褲。具體上，作爲側邊薄片，使用了基重 爲15g/m2，基重CV値爲4%的SMS不織布（紡黏層之纖 維粗度爲2.2〜2.3dtex(16〜19//m)，熔噴層之纖維粗 度爲0·04〜0.05dtex(1.9〜2.7//m))。又，作爲背面薄 片，使用了基重爲188/1112，基重（^値爲6.1%的紡黏不 織布（纖維粗度爲 1.2〜1.3dtex(13〜16//m))。再者 ，作爲插入於腿側接合部之插入薄片，使用了由與背面薄 片相同的不織布所構成之帶狀插入薄片。插入薄片，爲配 置於從腿側接合部朝向後身片之寬幅方向延伸而直至吸收 性芯片的交界之區域。又，關於吸收體或彈性構件等之其 他構件，則使用以往習知者，並藉由以往習知之製造方法 來製造。 〈比較例1〉 於比較例1，作爲側邊薄片，使用了基重爲13g/m2， 基重CV値爲4%的SMS不織布（紡黏層之纖維粗度爲 2.2〜2.3dtex(16〜19/zm)，熔噴層之纖維粗度爲 0.04 〜0.05dtex (1.7〜2.5//m))。又，作爲背面薄片，使用 了基重爲23g/m2’基重CV値爲6%之熱式點黏不織布（ 纖維粗度爲1.9〜2.5dtex(17〜22//m))。又，關於吸 收體或彈性構件等之其他構件，則使用以往習知者，並藉 由以往習知之製造方法來製造。 〈比較例2〉 -21 - (19) (19)1298632 於比較例2，作爲側邊薄片，使用了基重爲丨3 g/m2， 基重CV値爲4%的SMS不織布（紡黏層之纖維粗度爲 2.2〜2.3dtex(16〜19/zm)，熔噴層之纖維粗度爲〇.04 〜0.05dtex(1.9〜2·7#ηι))。又，作爲背面薄片，使用 了基重爲1 8g/m2，基重CV値爲6.1 %的紡黏不織布（纖 維粗度爲1.2〜1.3dtex(13〜16//m))。又，關於吸收 體或彈性構件等之其他構件，則使用以往習知者，並藉由 以往習知之製造方法來製造。 〈評價〉 關於由實施例1〜3及比較例1〜2所製得之短褲型用 後即棄式紙尿褲，進行了接合部強度之比較。接合部強度 之測量，爲裁切了含有腰側接合部的部位（於前身片及後 身片之同爲從腰部開口部起朝下方2 5 mm，朝寬幅方向 3 0mm之區域），以及含有腿側接合部的部位（於前身片 及後身片同爲從腿部開口部朝上方25mm，朝寬幅方向 3 0mm之區域），將裁切下來之前身片及後身片，夾於拉 伸測試機（株式會社島津製作所製精密萬能測試機「 autographAG-Ι」）之夾頭（抓持間隔：l〇mm〉後，以 500mm/min之剝離速度進行。又，將N數設定爲80，腰 側接合部及腿側接合部分別之平均値、最大値及最小値以 外，也求出了兩部位之接合強度的差。 將評價結果顯示於表1。如表1所示般，於有關比較 例1之短褲型用後即棄式紙尿褲，其腰側之接合強度爲 -22- (20) (20)1298632BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pants-type disposable diaper formed by overlapping and joining side edges of a front piece and a side piece of a back piece. In particular, it is a disposable diaper for shorts that combines excellent wearing and high joint strength. [Prior Art] In recent years, the quality of the disposable diapers has been greatly improved, and most of the babies are wearing disposable diapers. As a disposable diaper, there are two types of a form having a belt piece (a belt type) and a form having a shorts shape (short type). A disposable diaper with a sheet type is used for fixing the waist circumference at two places, and is aimed at a younger child of a lower age. On the other hand, the disposable diaper of the shorts type is integrally formed as a pair of panties, and can be worn directly in a standing state, and is intended for children aged 1 to 3 years old. These disposable diapers are required to be worn by children who are directly exposed to the delicate skin of the baby. Therefore, as a softer, thinner, and lighter material, the development of a disposable diaper using a low basis weight non-woven fabric has been progressing. However, the disposable diaper of the pants type is generally formed by overlapping and joining the side edges of the front body piece of the diaper body with the side edges of the back body piece. Such a shorts-type disposable diaper must have a bonding strength of -4-(2) (2)1298632 in order to prevent the joint from being unwound when the child is wearing or during the wearing. At this point, the use of a low basis weight non-woven diaper is due to its low basis weight, which is inferior to the high basis weight non-woven fabric. Therefore, the combination of an excellent wearing feeling and high joint strength has become a problem. In this regard, 'disclosure is directed to having a liquid permeable surface sheet; and a liquid-impermeable back sheet; and a liquid-absorbent chip sandwiched between the two sheets' and by aspirating the front and back body sheets The side panels of the left and right sides of the chip which are extended toward the outside are overlapped and fused in a palm shape, and the pants-type disposable diaper which is integrally formed is integrally formed on the outer surface of the back sheet forming the side flap portion. A technique in which the outer sheet of the side flap portion is fused with the cover sheet at a point higher than the back sheet and is covered with a cover sheet (see Patent Document 1). According to the pants-type disposable diaper, the surface of the fused portion is not roughened and is irritated to the wearer's skin. In addition, as an improvement technique of the disposable diaper for a pants type disclosed in Patent Document 1, it is disclosed that at least one of the front and back sheets of the side flap portion is formed by a sheet member joined to the front surface of the front and back sheets. The technique of melting the side of the back sheet of the melted portion to form a sheet having a melting point smaller than that of the surface sheet side (see Patent Document 2). According to the pants-type disposable diaper, the surface of the fused portion does not become rough and irritates the wearer's skin without impairing the appearance of the diaper. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei 6-327713 (Patent Document 2) Japanese Laid-Open Patent Publication No. Hei No. Hei. No. Hei. No. Hei. No. 6-327714. [Technical Problem to be Solved by the Invention] -5- (3) 1298632 However, it is disclosed in The technique of the patent documents, the sheet material, is not a technique using a material having a low basis weight. Further, in order to improve the skin contact of the fusion portion, it is not an excellent wearing feeling and a high joint strength. The present invention provides a combination of excellent wear and high joint strength in view of the above-mentioned problems. Short one diaper. [Technical means for solving the problem] The inventors of the present invention have been made to solve the above problems. As a result, it has been found that the above-mentioned problem can be solved by using a non-woven fabric having a low basis weight as a range in which the joint portion on the waist side and the joint portion on the leg side are respectively defined. More specifically, the present invention provides a diaper body φ having a pants-like shape, a waist opening portion attached to the wearer's body, and a leg opening portion, and a ventral side of the wearer. a back side piece of the front side of the front piece; and a pair of disposable diapers which are formed by overlapping the side edges of the front piece of the front piece, and extending from the downward direction to the leg opening. The diaper body is a liquid-impermeable non-face sheet having a shape of a basis weight of 20 g/m 2 or less; and the inside of the back sheet is passed between the front body sheet and the back body sheet. The diaper is the one whose main purpose is for the former. The purpose is to use the trousers type to use the disposable heart to repeatedly study the facial sheet, and to set the basis weight to pre-empt the invention, the body has: the body of the wearer's leg; And a pants type which is located at the side edge of the wearing side and the rear waist opening portion, and is formed of a liquid permeable non-woven fabric -6-(4) 1298632 which is formed by forming a woven fabric. a strip-shaped surface sheet; and a substantially strip-shaped absorbent chip disposed between the surface sheet and the back sheet and absorbing body fluid; and disposed on both side surfaces of the surface sheet and joined to the back sheet to form the above a side sheet composed of a liquid-impermeable non-woven fabric on both side edges of the back body sheet, and a pair of waist-side joint portions on the side of the waist opening in the pair of joint portions The weight is 78 g/m 2 or more and 120 g/m 2 or less, and the total basis weight of each of the pair of leg side joint portions on the side of the leg opening portion in the pair of joint portions is 65 g/m 2 or more and 100 g. /m2 or less The shorts are disposable disposable diapers. (1) A disposable diaper for a shorts type, which is a non-woven fabric having a low basis weight of 2 Og/m2 or less as a back sheet of a diaper, is soft and soft, and has a good wearing feeling. When the basis weight of the non-woven fabric constituting the back sheet is more than 20 g/m2, it cannot be said to be a low basis weight, and it is not possible to obtain a diaper which is softer and lighter than the conventional one and has a good wearing feeling. In addition, when the total basis weight of the waist joint portion is set to be 78 g/m 2 or more and 120 g/m 2 or less, and the total basis weight of the leg side joint portion is set to 65 g/m 2 or more and l〇〇g/m 2 or less, Therefore, although a low basis weight non-woven fabric is used as the back sheet, the joint strength of the joint portion is also excellent. Therefore, according to the present invention, it is possible to provide a pants-type disposable diaper which has both excellent wearing feeling and high joint strength. The means for setting the total basis weight of the waist joint portion and the leg side joint portion within the above range is not particularly limited. For example, the back sheet of the waist side joint portion and the back sheet of the leg side joint portion may be formed using different materials. Alternatively, the back sheet may be folded over the side of the diaper (5) (1) 1228632, and then joined at the waist side joint portion, or at the leg side joint portion, between the side sheet and the back sheet. Different flaky materials are joined again. (2) The pants-type disposable diaper according to (1), wherein the pair of waist-side joint portions are provided in a region 25 mm or less downward from the waist opening portion, and the pair of leg-side joint portions It is provided in an area within 25 mm upward from the leg opening. (2) The disposable diaper for a shorts type, which is a total basis weight of a region within 25 mm from the waist opening portion, is set to be 78 g/m2 or more and 120 g/m2 or less, and is 25 mm upward from the leg opening portion. The diaper having a total basis weight of the area within the area of 65 g/m 2 or more and 100 g/m 2 or less is set. That is, it is the base weight of the part where the high joint strength is most required, and the joint strength is set to a certain level or more. Therefore, it is possible to provide a diaper which can continuously ensure a better wearing feeling and has a high joint strength. (3) The disposable diaper of the pants type according to (1) or (2), wherein the nonwoven fabric constituting the back sheet has a fiber thickness of 0.8 dtex or more and 1.5 dtex or less. (3) A disposable diaper for a shorts type, which is a diaper in which the thickness of the fibers constituting the back sheet is set to 〇8 dtex or more and 1.5 dtex or less. In other words, it is a non-woven fabric made of fibers which are thinner than conventional fibers which are generally non-woven, and has a good touch, and is a diaper which is excellent in wearing feeling. When the fiber thickness is finer than 0.8 dtex, the necessary joint strength cannot be obtained. Moreover, since it is a low basis weight, unevenness in basis weight is generated. On the other hand, when the fiber thickness is thicker than 1.5 dt ex , a diaper excellent in wearing feeling cannot be obtained. Further, since it is a waist-side -8 - (8) 1298632, the disposable diaper 1 〇 () is used in the embodiment, and the 190 is separated into the front body 101 and the back body 1 〇 2 Plane is in Figure 3. The disposable pants 100 of the present embodiment is a disposable diaper body 110 having a shorts shape. [Plastic Trunk Main Body 1 1 0] The diaper main body 110 is provided with: a pair of leg portions 1 30 that are attached to the wearer's body opening portion; and a leg portion that is attached to the wearer's leg; and a wearer's belly The front body piece 1 〇i; and the back body piece 1 0 2 on the wearing side; and the side edges of the front body piece 1 〇 与 and the side edges of the 012 overlap and join each other, and from the waist 1 2 A pair of joint portions that extend downward to the leg opening portion 丨3 又, and the diaper main body 1 1 〇 is provided with a back sheet and a configuration including a liquid-impermeable nonwoven fabric having an outer shape of 2Og/m 2 or less. a substantially strip-shaped surface sheet 111 which is not woven from the front body piece 10 1 1 to the back body piece 102 from the front side of the back sheet 1 1 2 and through the leg opening portion; The chip 1 1 1 and the back sheet 1 1 2 absorb the body fluid of the substantially strip-shaped chip 180; and the two sides of the surface sheet 1 1 1 and the facing sheet 112, and form the front piece 1〇1 And two side sheets 1 1 4 composed of a liquid-impermeable non-woven fabric of the back body sheet 1〇2. These backs 1 1 2, the surface sheet 1 1 1 , the side sheets 1 1 4, and the absorbent core are suitable for use with a heat seal, an ultrasonic seal, or a hot melt adhesive. Further, the side opening portion of the surface sheet 1 1 1 and the side sheet joining portion are shown in the waist opening portion of the diaper body, and the back side opening portion 190. The basis weight '112; 130 布 所 所 吸收 吸收 吸收 吸收 吸收 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 180 It is ideal for the liquid-impermeable three-dimensional edge that the elastic member will stand up (not shown). Further, a fixed adhesive tape (not shown) for disposal of the disposable diaper may be provided on both sides of the diaper main body 1 1 或 or the back body piece 102, and the front body piece 1〇1 or the back body piece 1〇 2 'You can also mark patterns and so on. The diaper main body 110' is provided with a peripheral edge along the leg opening portion 13b, and extends from the front body piece 101 side through the leg opening portion 丨3 〇 upper portion to the back body piece 102 side. A plurality of elastic members 1 7 〇. Further, the diaper main body 110' is provided with a stretchable elastic cord 107 at one of the front body piece 101 and the back body piece i 〇 2, and the telescopic rope 1 〇 7 is attached to the wearer in an extended state, and can be tightly closed. Then wear the body of the author. Further, the diaper main body 110 includes a plurality of waist belts 109 extending along the waist opening portion 120. The waist belt 109 is substantially parallel to the edge of the waist opening portion 12A. The telescopic cords 107 are disposed on both side portions of the front body piece 101 and the back body piece 102 in such a manner as to be substantially parallel to the waist belt 1〇9, and extend substantially linearly in the width direction of the diaper main body 110. The bellows 1 〇 7 and the waist belt 109' are disposed between the back sheet 112 and the side sheet 114, and are joined together by heat fusion in an extended state. The elastic member 170, the waist belt 109, and the stretch cord 107 are not particularly limited as long as they are elastically stretchable. For example, various materials such as natural rubber, synthetic rubber, linear rubber made of polyurethane, flat rubber, ribbon rubber, heat shrinkable material, and water absorbing fiber can be used. [Back sheet 1 1 2, side sheet 1 1 4] 12- (10) (10) 1298632 As a sheet constituting the back sheet 1 1 2 and the side sheet 1 1 4, in order to ensure liquid resistance and excellent The skin feel and the air permeability are, for example, a spunbonded nonwoven fabric made of polypropylene or the like, a non-woven fabric made of fibers such as polyethylene, polypropylene, or polyethylene terephthalate, or a non-woven fabric. Other composite sheets containing an elastic or stretchable nonwoven fabric or a stretchable film may also be used. Further, a water-impermeable plastic film or a sheet which is bonded to each other may be used. The plastic film is ventilated and moisture permeable after being mixed with the enamel charge. As the nonwoven fabric, a non-woven fabric composed of a side-by-side type composite fiber can be used in addition to the core-sheath type composite fiber formed of a fiber such as a polyolefin type, a polyester type or a polyamide type. Moreover, the manufacturing method of the non-woven fabric is not particularly limited, and a side-by-side composite manufactured by a method such as spunbonding, tack bonding, airflow bonding, chemical non-woven thermal fusion, melt blowing, spray coating, or needle rolling may be used. fiber. In particular, in order to prevent the excretion absorbed by the absorptive chip from leaking toward the outside, the back sheet 1 12 must be water-repellent by the non-woven fabric described above. By forming the back sheet 1 1 2 as a moisture permeable material, it is possible to reduce the suffocation at the time of attachment and to eliminate the uncomfortable feeling. As such a material, for example, in addition to a fluent film obtained by laminating a synthetic resin film, an inorganic ruthenium-filled material, and a vent film obtained by stretching treatment, it is also possible to use a paper and a non-woven fabric. The laminated cloth has an air permeable liquid barrier sheet which is provided with an opening of 10% to 30% and a pore diameter of 〇·1 mm to 0.6 mm, and is disposed by arranging the capillary toward the absorbent body side. Preferably, -13-(11)(11)1298632 is a hot-workable film which is subjected to embossing by a cloth-like appearance, and the back sheet 1 1 2 used in the embodiment, It is formed by a low basis weight non-woven fabric. Specifically, the basis weight of the liquid-impermeable nonwoven fabric constituting the back sheet 1 1 2 is set to be in the range of 20 g/m 2 or less. Further, the fiber thickness of the nonwoven fabric constituting the back sheet 112 is set to be in the range of 0.8 dtex or more and 1.5 dtex or less. Thereby, a diaper which is soft and lightweight and excellent in wearing feeling can be obtained. In the present embodiment, the method of measuring the basis weight of the nonwoven fabric is as follows. First, the non-woven fabric used for measurement is correctly cut into lOOmmxlOOmm, and the non-woven fabric under cutting is measured with the electronic balance to the fourth place below the decimal point. Then, the basis weight is obtained by calculation using the following formula. [Formula 1] Basis weight (g/m2) = mass of sample (g) + {(length of longitudinal direction of sample (mm) / 1 000 ) x (length of transverse direction of sample (mm) / l〇〇〇) } In the present embodiment, as the back sheet 1 1 2, since a non-woven fabric having a low basis weight and a small fiber diameter is used, unevenness in basis weight is likely to occur, and a non-woven fabric having uneven basis weight is generated, which is not preferable in performance and appearance. Therefore, in the present embodiment, the basis weight C V 测量 measured as described below is preferably in the range of 2% to 6%. As long as it is within this range, a nonwoven fabric having good properties and appearance can be obtained. In the present embodiment, the basis weight CV値 is obtained as follows. First, -14- (12) (12)1298632 The non-woven fabric is correctly cut into 50 mm x 1000 mm, and the quality of the cut non-woven fabric is measured, and the basis weight is converted by the above method. Then, the average standard deviation of the basis weights of the cut slices in the short side direction is obtained, and CV 値 (%) is obtained by dividing the average 値 by the standard deviation and multiplying by 100. [Surface Sheet 1 1 1 , Absorbent Chip 1 80] As the surface sheet 1 1 1 , a material which does not irritate the skin is preferable, and a hydrophilic non-woven fabric can be used. The so-called non-woven fabric is manufactured by a method of spunbonding, spray blasting, needle rolling, melt blowing, hot melt, chemical non-woven heat fusion, air flow, and the like. As the non-woven fabric, the same as the back sheet 112 or the side sheet 141 can be used. Further, it is also possible to use hydrazine, acetate, cotton, pulp, or a fibrous sheet which is composited by using a synthetic resin alone or in a core-sheath structure. As the absorbent chip 180, it is preferred to use a defibrated pulp and a superabsorbent polymer, and a cellulose fiber, a thermoplastic resin, a superabsorbent polymer, a heat-fusible fiber, or the like is preferably used. It is also desirable to mix and apply heat treatment. Further, in the case of a plurality of layers, the superabsorbent polymer may be present in any of the upper layer, the middle layer and the lower layer, or may be mixed with the pulp. The superabsorbent polymer is preferably one which has a property of absorbing and retaining a liquid of 20 times or more of its own weight and having gelation properties. As such a polymer water-absorbent polymer, a starch-acrylic acid (salt) graft copolymer, a starch-acrylic acid saponified saponified product, a carboxymethylcellulose sodium crosslinked product, or an acrylic acid (salt) polymer may be mentioned. Wait. 15- (13) (13) 1928 632 [waist side joint portion 191 and leg side joint portion 1 92] In the present embodiment, the joint portion 1 90 is provided with a waist side located on the side of the waist opening portion 120 The joint portion 191 is a leg side joint portion 192 located on the side of the leg opening portion 130. In the present embodiment, the waist side joint portion 191 is a region that is 25 mm below the waist opening portion 120, and the leg side joint portion 192 is preferably a region within 25 mm from the leg portion opening portion 130. The joint portion 190 of the pants-type disposable diaper 100 of the present embodiment is shown in Fig. 4 when viewed from the side. However, in Fig. 4, the waist belt 109 provided along the edge of the waist opening portion 120 is omitted for simplification. As shown in Fig. 4, in the present embodiment, the pair of joint portions 190 are formed by laminating the back sheet 112 and the side sheet 114. At the waist side joint portion 191, the back sheet 1 1 2 is folded over the inside of the diaper body 1 1 后 and then joined. Therefore, the waist joint portion 191 is formed by stacking a total of six layers of the four back sheet 112 and the two side sheets 114. Further, the leg side joint portion 192 is formed by laminating a total of four layers of two back sheets 112 and two side sheets 114. In the present embodiment, the total basis weight of the waist joint portion 191 is set to be in the range of from 7 8 g/m 2 to 120 g/m 2 . In other words, the total basis weight of the total of six layers of the four-layer back sheet 112 and the two-layer side sheets 114 is set to be in the range of from 7 8 g/m 2 to 120 g/m 2 . Thereby, high joint strength can be ensured at the waist side joint portion 191. Further, as long as the total basis weight of the waist side joint portion 191 is within the above range, the back sheet 1 1 2 may not be folded over the inner side of the diaper body 110 without folding -16-(14)(14)1298632. Joiner. Further, in the present embodiment, the total basis weight of the leg side joint portions 192 is set to be in the range of 65 g/m2 or more and 100 g/m2 or less. In other words, the total basis weight of the total of four layers of the two-layer back sheet 112 and the two-layer side sheets 114 is set to be in the range of 65 g/m2 or more and 100 g/m2 or less. Thereby, high joint strength can be ensured at the leg side joint portion 92. <Second Embodiment> An enlarged cross-sectional view of the joint portion 290 of the pants-type disposable diaper 200 according to the present embodiment as seen from the side is shown in Fig. 5. However, similarly to Fig. 4, in Fig. 5, the waist belt 209 provided along the edge of the waist opening portion 22 is also omitted. The pants-type disposable diaper 200 of the present embodiment is characterized in that the pair of joint portions 290 are provided with a waist side including the waist side joint portion 29 1 and a leg side including the leg side joint portion 2 92. The points of the two different types of back sheets 212a and 212b. The other configurations are the same as those of the first embodiment. More specifically, in the joint portion 290, the back sheet 212a is used on the waist side including the waist side joint portion 291, and the back sheet 212b is used on the leg side including the leg side joint portion 292. Specifically, the total basis weight of the waist side joint portion 291 and the leg side joint portion 292 is set to be in a range of 78 g/m 2 or more and 120 g/m 2 or less and 65 g/m 2 or more and 100 g/m 2 or less, respectively. Not woven. Further, the back sheet 212a and the back sheet 212b may be the same type of nonwoven fabric having different basis weights. According to the present embodiment, the same effects as those of the first embodiment can be obtained. -17- (15) (15)1298632 <Third Embodiment> An enlarged cross-sectional view of the joint portion 390 of the pants-type disposable diaper 300 of the present embodiment is shown in a side view. Figure 6. However, similarly to Figs. 4 and 5, in Fig. 6, the waist belt 309 provided along the edge of the waist opening portion 320 is also omitted. Further, a rear view of the pants-type disposable diaper 300 of the present embodiment is shown in Fig. 7. As shown in Fig. 6, the pants-type disposable diaper 300 of the present embodiment is characterized in that a pair of side portions 314 and a back side of the leg side joint portion 392 are formed in a pair of joint portions 3 9 〇. Between the sheets 312, a strip-shaped insertion sheet 313 is inserted. As shown in Fig. 7, the insertion sheet 313 is disposed in a region extending from the leg side joint portion 392 toward the width direction of the back body sheet 3 〇 2 by a predetermined size. The arrangement portion of the insertion sheet 313 is not particularly limited as long as it is in this region, and is disposed, for example, from the leg side joint portion 392 to the width direction of the back piece 312 until the boundary of the absorbent chip 38 8 附近. The area. The configuration other than these is the same as in the first embodiment. In the present embodiment, since the insertion sheet 3 1 3 is inserted, the total basis weight of the leg-side joint portions 392, that is, the two-layer side sheet 3 14 , the two-layer back sheet 312, and the 1-layer insert sheet The total basis weight of the total of five layers of 313 is set to be in the range of 65 g/m 2 or more and l〇〇g/m 2 or less, and the basis weight of the back sheet 312 and the side sheet 314 is adjusted. The insertion sheet 313 is not particularly limited as long as the total basis weight of the leg side joint portions 392 is within the above range. Preferably, a non-woven fabric is used, and a plastic film -18-(16) 1298632 or the like can also be used. As the non-woven fabric, a non-woven fabric used for the back sheet 312 or the side sheet 314 as described above can be employed. By the insertion of the insertion sheet 313, even if a low basis weight nonwoven fabric is used as the back sheet 3 1 2, the joint strength of the leg side joint portion 392 can be improved. <Modification> A rear view of the pants-type disposable diaper 400 according to a modification of the present embodiment is shown in Fig. 8. The disposable diaper 400 for a pants type according to the present modification is the same as the present embodiment except that the position where the insertion sheet 413 is placed is changed. Specifically, the insertion sheet 413 is disposed in a region extending from one of the pair of leg side joint portions 492 toward the width direction of the back body sheet 402 to the other region. In other words, the rear body piece 4〇2 is linearly and continuously arranged from one of the pair of leg side joint portions 492 to the other. According to this modification, the same effects as those of the embodiment can be obtained. [Examples] Hereinafter, examples of the invention will be described. However, the invention is not limited to the following examples. <Example 1> As a first embodiment, a disposable diaper for a pants type according to the first embodiment was produced. Specifically, as the side sheet, an SMS non-woven fabric having a basis weight of 15 g/m 2 and a basis weight CV 値 of 4% is used (the spunbonded fiber -19-(17) (17) 1928632 has a thickness of 2.2 to 2.3. Dtex (l6~19//m), the meltblown layer has a fiber thickness of 0.04 to 0.05 dtex (1.9 to 2.7//m). Further, as the back sheet, a spunbonded nonwoven fabric having a basis weight of 19 g/m2 and a basis weight cv値 of 7% (having a fiber thickness of 12 to 1.5 dtex (13 to 16/m)) was used. Further, other members such as an absorbent body or an elastic member can be produced by a conventionally known manufacturing method using conventional methods. <Example 2> As a second example, a disposable diaper for a pants type according to the third embodiment was produced. Specifically, as the side sheet, an SMS non-woven fabric having a basis weight of 15 g/m 2 and a basis weight CV 値 of 4% was used (the fiber thickness of the spunbond layer was 2.2 to 2.3 dtex (16 to 19 // m), and the melt was melted. The fiber thickness of the spray layer is 0.04 to 0.05 dtex (1.9 to 2.7//m). Further, as the back sheet, a spunbonded nonwoven fabric having a basis weight of 19 g/m2 and a basis weight CV値 of 7% (having a fiber thickness of 1.2 to 1.5 dtex (13 to 16 cm)) was used. Further, as the insertion sheet inserted into the leg side joint portion, a strip-shaped insertion sheet composed of the same nonwoven fabric as the back sheet was used. The insertion sheet is disposed in a region extending from the leg side joint portion toward the width direction of the back body sheet to the boundary of the absorbent chip. Further, other members such as an absorber or an elastic member are manufactured by a conventional method using conventional methods. <Example 3> As Example 3, a disposable diaper of the pants type -20-(18)(18)1298632 of the third embodiment was produced. Specifically, as the side sheet, an SMS non-woven fabric having a basis weight of 15 g/m 2 and a basis weight CV 値 of 4% was used (the fiber thickness of the spunbond layer was 2.2 to 2.3 dtex (16 to 19 // m), and the melt was melted. The fiber thickness of the spray layer is from 0.04 to 0.05 dtex (1.9 to 2.7//m). Further, as the back sheet, a spunbonded nonwoven fabric having a basis weight of 188/1112 and a basis weight of 6.1% (fiber thickness of 1.2 to 1.3 dtex (13 to 16/m)) was used. The insertion sheet inserted into the leg side joint portion is a strip-shaped insertion sheet composed of the same non-woven fabric as the back sheet. The insertion sheet is disposed to extend from the leg side joint portion toward the back body sheet in the width direction until absorption. In addition, the other components such as the absorber or the elastic member are manufactured by a conventional method, and are manufactured by a conventional manufacturing method. <Comparative Example 1> In Comparative Example 1, the side is used. For the edge sheet, an SMS non-woven fabric having a basis weight of 13 g/m 2 and a basis weight CV 4 of 4% was used (the fiber thickness of the spunbond layer was 2.2 to 2.3 dtex (16 to 19/zm), and the fiber thickness of the melt blown layer was used. It is 0.04 to 0.05 dtex (1.7 to 2.5//m). Further, as the back sheet, a thermal point non-woven fabric having a basis weight of 23 g/m2' basis weight CV値 of 6% is used (fiber thickness is 1.9~) 2.5dtex (17~22//m)). In addition, regarding the other members such as the absorber or the elastic member, the conventional use is used. It was produced by a conventionally known manufacturing method. <Comparative Example 2> -21 - (19) (19)1298632 In Comparative Example 2, a basis weight of 丨3 g/m2 was used as a side sheet. The heavy CV値 is 4% SMS non-woven fabric (the fiber thickness of the spunbond layer is 2.2~2.3dtex (16~19/zm), and the fiber thickness of the meltblown layer is 〇.04~0.05dtex (1.9~2·7) #ηι)) Further, as the back sheet, a spunbonded nonwoven fabric having a basis weight of 18 g/m2 and a basis weight CV値 of 6.1% (fiber thickness of 1.2 to 1.3 dtex (13 to 16//m)) was used. Further, other members such as an absorbent body or an elastic member are manufactured by a conventional method, and are manufactured by a conventional manufacturing method. <Evaluation> About the examples 1 to 3 and the comparative examples 1 and 2 The short-pants disposable diapers were used to compare the strength of the joints. The strength of the joints was measured to cut the parts containing the waist joints (the front body and the back body were opened from the waist). The part is 2 5 mm downward, 3 mm in the width direction), and the part containing the leg side joints (the front body and the back body are both open from the leg) In the area of 25 mm in the upper direction and 30 mm in the width direction, the body and the back body are cut and placed on a tensile testing machine ("autograph AG-Ι" manufactured by Shimadzu Corporation) After the chuck (grip interval: l〇mm>, the peeling speed was performed at 500 mm/min. Further, the number of N was set to 80, and the average 値, maximum 値, and minimum 腰 of the waist joint portion and the leg side joint portion, respectively. In addition, the difference in bonding strength between the two portions was also obtained. The evaluation results are shown in Table 1. As shown in Table 1, in the disposable diaper of the pants type of Comparative Example 1, the joint strength of the waist side was -22-(20) (20)1298632.
3〇〜3 1N/2 5 mm，強度很大，爲於丟棄紙尿褲時接合部不 易撕破者。又，於有關比較例2之短褲型用後即棄式紙尿 褲，其腿側之接合強度的最小値爲7〜9N/25mm，強度很 小’爲於裝者紙尿褲時接合部易於破損者。相對於此，於 有關本實施例之短褲型用後即棄式紙尿褲，已確認於腿側 接合部及腰側接合部皆具備有適度之接合強度。 -23- (21)12986323〇~3 1N/2 5 mm, the strength is very large, so that the joint is not easily torn when the diaper is discarded. Further, in the disposable diaper of the pants type according to Comparative Example 2, the minimum joint strength of the leg side was 7 to 9 N/25 mm, and the strength was small, which was a case where the joint portion was easily broken when the diaper was loaded. On the other hand, in the disposable diaper of the pants type according to the present embodiment, it has been confirmed that both the leg side joint portion and the waist side joint portion have moderate joint strength. -23- (21)1298632
比較例2 腿側 1.2 〜1.3 Ό r-H 1 m (N 〇〇 VC m rsi cn 1 1 1 (N VO v〇 m VO r-H (N 〇〇 1 (N 18 〜22 〇\ 1 卜 腰側 寸 00 (N cn 1 1 1 00 σ\ g 18 〜20 CN 1 (N (N 16 〜18 比較例1 i腿側 1.9 〜2.5 17 〜22 <N m (Μ 妄 CN m 1 1 1 Ό g 20 〜23 〇\ 1 卜 〇 m l CN (N 15 〜17 腰側 寸 CO (N cn 1 1 1 00 ▼Η g 30 〜31 38 〜41 20 〜22 實施例3 腿側 1.2 〜1.3 13 〜16 oo v〇 m (N ^Ti r-H 〇〇 00 s OO § oo l 卜 ▼Η 2〜5 l 12 〜14 腰側 寸 oo rs in 1 1 1 s r-H 20 〜22 28 〜30 16 〜18 實施例2 腿側 1.2 〜1.5 13 〜16 CN Oj 00 m (N On ON ss σ\ § 17 〜20 0〜5 26 〜27 13 〜15 腰側 寸 〇\ v〇 CN JT) 1 1 1 § 1 24 〜26 15 〜18 實施例1 腿側 1- 1.2 〜1.5 Ό r-H 1 cn (N 〇\ 00 m (N 1 1 1 oo \〇 00 m g 12 〜16 〇 r-H 寸 18 〜22 r*H l oo 臟11 寸 ON VO CN ^Ti 1 1 1 s r-H g 20 〜22 24 〜26 oo r-H l yn ▼-H 單位 1___ 1 dtex fim (N Ϊ 1 CN 畏 北 (N 4 rN I 畏 N/25mm N/25mm N/25mm N/25mm 纖維粗度 層數 基重 基重小計 層數 基重 基重小計 層數 基重 基重小計 合計基重 基重差 背面薄片 側邊薄片 插入薄片 接合部 強度測量N 平均値 腰側-腿側之差 最大値 最小値 -24- (22) 1298632 【圖式簡單說明】 第1圖是有關第一實施形態之短褲型用後即棄式紙尿 褲的立體圖。 " 第2圖是有關第一實施形態之短褲型用後即棄式紙尿 褲的正面圖。 ' 第3圖是將接合部分離成前身片及後身片之有關第一 ' 實施形態的短褲型用後即棄式紙尿褲之展開平面圖。 B 第4圖是從側面觀察有關第一實施形態之短褲型用後 即棄式紙尿褲的接合部時之放大斷面圖。 第5圖是從側面觀察有關第二實施形態之短褲型用後 即棄式紙尿褲的接合部時之放大斷面圖。 第6圖是從側面觀察有關第三實施形態之短褲型用後 即棄式紙尿褲的接合部時之放大斷面圖。 第7圖是有關第二實施形態之短褲型用後即棄式紙尿 褲的背面圖。 • 第8圖是有關第三實施形態之變形例的短褲型用後即 棄式紙尿褲之背面圖。 【主要元件符號說明】 100、200、300、400 ： 短褲型用後即棄式紙尿褲 101 、 261 、 301 、 401 ： 102 > 202 、 302、 402 ： 107、 207 、 307、 407 109、 209、 309、 409 ： 前身片 後身片 伸縮繩 腰帶 -25· (23)1298632Comparative Example 2 Leg side 1.2 〜1.3 Ό rH 1 m (N 〇〇VC m rsi cn 1 1 1 (N VO v〇m VO rH (N 1 (N 18 ～22 〇\ 1 腰腰 side inch 00 ( N cn 1 1 1 00 σ\ g 18 〜 20 CN 1 (N (N 16 〜 18 Comparative Example 1 i leg side 1.9 〜 2.5 17 〜 22 < N m (Μ 妄CN m 1 1 1 Ό g 20 〜 23 〇 \ 1 〇 〇 ml CN (N 15 ~ 17 waist side inch CO (N cn 1 1 1 00 ▼ Η g 30 ~ 31 38 ~ 41 20 ~ 22 Example 3 leg side 1.2 ~ 1.3 13 ~ 16 oo v〇m (N ^ Ti rH 〇〇 00 s OO § oo l 卜 ▼ Η 2~5 l 12 ~ 14 waist side inch oo rs in 1 1 1 s rH 20 ~ 22 28 ~ 30 16 ~ 18 Example 2 Leg side 1.2 ~ 1.5 13 ~ 16 CN Oj 00 m (N On ON ss σ\ § 17 ~ 20 0~5 26 ~ 27 13 ~ 15 waist side inch 〇 \ v〇CN JT) 1 1 1 § 1 24 ~ 26 15 ~ 18 Implementation Example 1 Leg side 1-1.2 ～1.5 Ό rH 1 cn (N 〇\ 00 m (N 1 1 1 oo \〇00 mg 12 ～r HrH inch 18 〜22 r*H l oo dirty 11 inch ON VO CN ^ Ti 1 1 1 s rH g 20 〜 22 24 〜 26 oo rH l yn ▼-H Unit 1___ 1 dtex fim (N Ϊ 1 CN 北北(N 4 rN I fear N/25mm N/25mm N/25mm N/25 Mm fiber thickness layer basis weight basis subtotal layer number basis weight basis subtotal layer number basis weight basis subtotal total basis weight basis difference back sheet side sheet insertion sheet joint strength measurement N average waist side - leg side The difference between the maximum and the minimum 値-24- (22) 1298632 [Simplified description of the drawings] Fig. 1 is a perspective view of the disposable diaper of the pants type according to the first embodiment. " Fig. 2 is related to the first embodiment Front view of the disposable diaper of the form of a shorts type. Fig. 3 is a plan view showing the disposable diaper of the pants type according to the first embodiment of the front body piece and the back body piece. B Fig. 4 is an enlarged cross-sectional view showing the joint portion of the pants-type disposable diaper according to the first embodiment as seen from the side. Fig. 5 is an enlarged cross-sectional view showing the joint portion of the pants-type disposable diaper according to the second embodiment as seen from the side. Fig. 6 is an enlarged cross-sectional view showing the joint portion of the pants-type disposable diaper according to the third embodiment as seen from the side. Fig. 7 is a rear elevational view showing the pants-type disposable diaper according to the second embodiment. Fig. 8 is a rear elevational view of the disposable diaper for a pants type according to a modification of the third embodiment. [Description of main component symbols] 100, 200, 300, 400: disposable diapers 101, 261, 301, 401: 102 > 202, 302, 402: 107, 207, 307, 407 109, 209 309, 409 : Front body piece back body telescopic rope belt -25 (23)1298632
110、 210、 120 > 220 、 130 、 230 、 114、 214、 112、 212 、 1 1 1、2 1 1、 170 、 270 、 180、 280 、 3 1 3、4 1 3 : 190、 290 、 191 、 291 、 192 、 292 、 3 1 0、4 1 0 :紙尿褲本體 3 20、420 :腰部開口部 3 3 0、43 0 :腿部開口部 3 1 4、4 1 4 :側邊薄片 312、412:背面薄片 311、411:表面薄片 3 7 0、4 7 0 :彈性構件 3 8 0、4 8 0 :吸收性芯片 插入薄片 390 、 490 :接合部 39 1、491 :腰側接合部 3 92、492 :腿側接合部110, 210, 120 > 220, 130, 230, 114, 214, 112, 212, 1 1 1 , 2 1 1 , 170 , 270 , 180 , 280 , 3 1 3 , 4 1 3 : 190, 290, 191 291, 192, 292, 3 1 0, 4 1 0 : diaper body 3 20, 420: waist opening 3 3 0, 43 0 : leg opening 3 1 4, 4 1 4 : side sheets 312, 412 : back sheet 311, 411: surface sheet 3 7 0, 4 7 0 : elastic member 3 8 0, 4 8 0 : absorptive chip insertion sheet 390, 490: joint portion 39 1 , 491 : waist side joint portion 3 92, 492: leg side joint
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