201117780 六、發明說明： 【發明所屬之技術領域】 本發明是關於吸收性物品之製造方法以及藉由吸收性 物品之製造方法所製造之吸收性物品，該吸收性物品至少 具備：由複數個薄片狀資材貼合而成之複合薄片、以及貼 附於複合薄片之吸收體。 【先前技術】 拋棄式紙尿布等的吸收性物品係具備：接觸穿戴者的 皮膚之表面薄片、最遠離穿戴者之背面薄片、設置於表面 薄片和背面薄片之間的吸收體。該等的表面薄片或背面薄 片’可能是由不同材料之複數個薄片所構成。例如背面薄 片’是將液體無法透過之非液體透過性的薄片狀的底層薄 膜和設置於底層薄膜的外側之薄片狀的底層不織布重疊而 構成。 如此般將不同材料的兩個薄片重疊而製造複合薄片的 方法已被揭示出（例如參照專利文獻1 )。專利文獻1所揭 示的技術’不同材料之薄片狀資材是在重疊狀態下藉由齒 輪延伸法進行延伸 汎用之非液體透過性的薄片狀資材較硬，藉由對複合 薄片實施延伸加工能使其變軟。此外，若對複合薄片實施 延伸加工，能將寬度方向的尺寸擴寬，因此可減少投入製 造線的資材量，而能謀求製造成本的降低。 〔專利文獻1〕日本特開2002-3 1 63 59號公報（第4頁 201117780 ，第1圖等） 【發明內容】 然而，上述複合薄片之製造方法，並無法充分對應於 生產速度之高速化。由於構成複合薄片之薄片狀資材各個 的所謂延性値是不同的，因此延伸加工時的延伸量的界限 値會有不同。 若生產速度變得高速化，施加於沿著製造線搬運之薄 片狀資材的負荷變大，被延伸成延伸量接近界限値的薄片 狀資材容易發生損傷。如此會造成製造良率降低’因此必 須抑制薄片狀資材的延伸量。如此般，習知之複合薄片的 製造方法，無法兼顧生產速度的高度化和製造成本的降低 〇 於是，本發明的目的是爲了提供一種吸收性物品之製 造方法以及吸收性物品之製造方法所製造之吸收性物品， 即使提高生產速度，仍不致降低製品品質且能減低製造成 本。 爲了解決上述課題，本發明具有以下的特徵。首先， 本發明之第1特徵是一種吸收性物品之製造方法，該吸收 性物品至少具備：由具有既定延性之第1薄片狀資材（底 層薄片120A)和延性比前述第1薄片狀資材小之第2薄片狀 資材（不織布薄片12 0B)貼合而成之複合薄片（背面薄片 2〇)、以及貼附於前述複合薄片之吸收體（吸收體30); 其要旨是包含：藉由在外周形成複數個凸部且隔著前述複 -6 - 201117780 合薄片在一方的凸部（凸部5 3 2 )間嵌合另一方凸部（凸 部542 )之一對的輥機構（壓花輥機構520 )，一邊將前述 第1薄片狀資材沿既定的搬運方向（機械方向MD)搬運— 邊將前述第1薄片狀資材延伸之步驟A (薄片延伸步驟S2〇 ):將前述被延伸的第1薄片狀資材貼附於前述第2薄片狀 資材而形成前述複合薄片之步驟B (薄片貼合步驟S40 )。 依據本發明的特徵可提供一種吸收性物品之製造方法 以及吸收性物品之製造方法所製造之吸收性物品，即使提 高生產速度，仍不致降低製品品質且能減低製造成本。 【實施方式】 以下，針對本實施形態的吸收性物品之製造方法及吸 收性物品，參照圖式來作說明。又在以下圖式的記載中， 對於相同或類似的部分，是賦予相同或類似的符號。但應 注意的是，圖式是示意的，各尺寸的比例等是和現實的物 品不同。 因此，具體的尺寸等，應參酌以下的說明來判斷。又 圖式彼此間，當然會包含彼此的尺寸關係和比例不同的部 分。 首先，針對本實施形態的吸收性物品之製造方法所製 造之吸收性物品1的構造’參照圖式來作說明。第1圖係顯 示本實施形態的吸收性物品1之俯視圖。第2圖係顯示本實 施形態的吸收性物品1之截面圖（第1圖的A -A截面圖）。 第3圖係顯示本實施形態的吸收性物品1之截面圖（第1圖 201117780 的B-B截面圖）。又在本實施形態，吸收性物品1是展開型 的紙尿布。 如第1〜3圖所示，吸收性物品1是從穿戴者的前胴周圍 (腹部側）朝向後胴周圍（背部側）的方向（以下稱長邊 方向L )具有縱長的形狀。 吸收性物品1，在長邊方向L上具有：對應於穿戴者的 前胴周圍之前胴周圍區域S1、對應於穿戴者的後胴周圍之 後胴周圍區域S2、對應於穿戴者的***且位於前胴周圍區 域S 1和後胴周圍區域S 2間之***區域S 3。 此外，吸收性物品1，是在與長邊方向L正交之寬度方 向W上具有：包含後述的吸收體30之中央區域C1、在寬度 方向W位於中央區域C 1的外側之一對的側部區域C 2。 這樣的吸收性物品1係具備表面薄片1 〇、背面薄片20 以及吸收體3 0。此外，在吸收性物品1設有腰翼片部40和 側翼片部50。 表面薄片10設置於接觸穿戴者皮膚的一側。表面薄片 10配設成包圍吸收體3〇β表面薄片10是由：親水性不織布 或織物、開口塑膠薄膜、開口疏水性不織布等的液體透過 性的薄片所形成。 背面薄片20，是設置在穿戴時之吸收性物品1的外側 。背面薄片20，是由液體無法透過之非液體透過性（例如 聚乙烯）的薄片狀的底層薄膜2 0Α (第1薄片狀資材）、設 置於底層薄膜20 Α的外側之薄片狀的底層不織布20Β (第2 薄片狀資材）所形成。 -8 - 201117780 底層薄膜20A實施後述延伸加工後（延伸後）之寬度 方向W的長度，是比底層不織布20B之寬度方向W的長度短 ，但比吸收體3 0之寬度方向W的長度更長。這樣的背面薄 片20，是構成由複數個薄片狀資材貼合成而之複合薄片。 又關於背面薄片20，隨後會詳細說明。 吸收體3 0設置於表面薄片1 0和背面薄片2 0之間。吸收 體3 0可吸收穿戴者的體液。吸收體30是包含：粉碎紙漿或 高吸收性聚合物等的混合粉體3 0 A、以及被覆混合粉體 30A之薄紙（tissue)等的被覆材30B。 腰翼片部40，是在長邊方向L上設置於前胴周圍區域 S1及後胴周圍區域S2。腰翼片部40係具有：位於前胴周圍 區域S 1之一對的前側翼片部40 A、位於後胴周圍區域S2之 一對的後側翼片部40B。 前側翼片部40A，是將貼附於背面薄片20之側薄片60 朝向寬度方向W外側延伸而形成的。又取代側薄片60，將 底層不織布20B延伸來形成前側翼片部40A亦可。 後側翼片部40B，與前側翼片部4〇A同樣的，是將側薄 片60朝向寬度方向W外側延伸而形成的。又與前側翼片部 40A同樣的，取代側薄片60，將底層不織布20B延伸來形成 後側翼片部4〇B亦可。在後側翼片部40B之吸收體30設置側 的面上，設置用來卡止於前胴周圍區域S1之卡止部41。 卡止部4〗，例如是由黏扣帶所形成。在此情況，黏扣 帶成爲公構件，而在前胴周圍區域S1之供卡止部41卡止的 區域設置母構件（被卡止部）。又前胴周圍區域S1是由不 -9 - 201117780 織布構成的情況，讓前胴周圍區域S1本身發揮被卡止部的 作用亦可。 側翼片部50，是在吸收體30之寬度方向W外側沿著長 邊方向L設置。在側翼片部5〇設置：在長邊方向L具有伸縮 性之橡膠（例如聚胺酯）構成的帶狀體51。帶狀體51，是 以沿長邊方向L伸長的狀態接合於背面薄片20。帶狀體5 1 從寬度方向W內側朝向外側係包含：第1帶狀體5 1 A、第2 帶狀體51B、第3帶狀體51C及第4帶狀體51D。 接著，參照圖式來說明上述背面薄片20的構造。第4 (a )圖係顯示本實施形態之背面薄片20的延性。第4 ( b )圖係顯示本實施形態之背面薄片20的延性的曲線圖。第 5 ( a )圖係顯示本實施形態之背面薄片20的俯視圖。第5 (b )圖係顯示本實施形態之背面薄片20之放大截面圖（ 第5 ( a )圖的A-A截面圖）。 如第4(a)圖及第4(b)圖所示，構成背面薄片20之 底層不織布20B的延性比底層薄膜20A的延性小。 如第5(a)圖所示，構成背面薄片20之底層薄膜20A 係具有延伸部21及未延伸部22。又構成背面薄片20之底層 不織布2 0B並未實施延伸加工。 延伸部21，是朝底層薄膜20 A的厚度方向T將底層薄膜 20A按壓而形成的區域。亦即，延伸部2 1，經由實施延伸 加工而使其基重（單位面積的質量）比未延伸部22更少。 延伸部2 1如第5 ( b )圖所示，是交互地形成延伸量大 的粗部2 1 L和擴張量比粗部2 1 L小之密部2 1 T。粗部2 1 L及BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an absorbent article and an absorbent article produced by the method for producing an absorbent article, the absorbent article comprising at least a plurality of sheets A composite sheet obtained by laminating the materials and an absorber attached to the composite sheet. [Prior Art] An absorbent article such as a disposable diaper has a surface sheet which contacts the wearer's skin, a back sheet which is farthest from the wearer, and an absorbent body which is provided between the surface sheet and the back sheet. These surface sheets or back sheets' may be composed of a plurality of sheets of different materials. For example, the back sheet ' is a non-liquid permeable sheet-like underlayer film which is impermeable to liquid and a sheet-like underlayer non-woven fabric provided on the outer side of the underlayer film. A method of manufacturing a composite sheet by superposing two sheets of different materials in this manner has been disclosed (for example, refer to Patent Document 1). According to the technique disclosed in Patent Document 1, the sheet-like material of different materials is a non-liquid permeable sheet-like material which is extended by a gear stretching method in an overlapped state, and is capable of being stretched by performing a stretching process on the composite sheet. Turn soft. Further, by performing the stretching process on the composite sheet, the size in the width direction can be widened, so that the amount of materials to be input into the manufacturing line can be reduced, and the manufacturing cost can be reduced. [Patent Document 1] JP-A-2002-3 1 63 59 (p. 4, 201117780, Fig. 1 and the like) SUMMARY OF THE INVENTION However, the method for producing a composite sheet described above does not sufficiently correspond to an increase in production speed. . Since the so-called ductile enthalpy of each of the sheet-like materials constituting the composite sheet is different, the limit of the amount of elongation at the time of stretching processing differs. When the production speed is increased, the load applied to the sheet-like material conveyed along the manufacturing line becomes large, and the sheet-like material that is stretched to have an elongation close to the limit 容易 is likely to be damaged. This causes a decrease in the manufacturing yield. Therefore, it is necessary to suppress the elongation of the sheet-like material. As described above, the conventional method for producing a composite sheet cannot achieve both the increase in production speed and the reduction in production cost. Therefore, an object of the present invention is to provide a method for producing an absorbent article and a method for producing the absorbent article. Absorbent articles, even if the production speed is increased, do not reduce the quality of the product and reduce the manufacturing cost. In order to solve the above problems, the present invention has the following features. First, a first aspect of the present invention provides a method for producing an absorbent article comprising at least a first sheet-like material (underlayer sheet 120A) having a predetermined ductility and a ductility smaller than that of the first sheet-like material. a composite sheet (back sheet 2) to which the second sheet-like material (non-woven sheet 12 0B) is bonded, and an absorber (absorbent body 30) attached to the composite sheet; the gist thereof includes: by the periphery A roller mechanism (embossing roller) in which a plurality of convex portions are formed and a pair of the other convex portions (protrusions 542) are fitted between one convex portion (protrusion portion 5 3 2 ) via the above-mentioned composite -6 - 201117780 laminated sheet The mechanism 520), in which the first sheet-shaped material is conveyed in a predetermined conveyance direction (machine direction MD), the step A of extending the first sheet-shaped material (sheet extension step S2): the extended portion A step B in which the sheet-like material is attached to the second sheet-like material to form the composite sheet (sheet bonding step S40). According to the features of the present invention, it is possible to provide an absorbent article manufactured by the method for producing an absorbent article and the method for producing the absorbent article, which can not reduce the quality of the product and can reduce the manufacturing cost even if the production speed is increased. [Embodiment] Hereinafter, a method for producing an absorbent article and an absorbent article according to the present embodiment will be described with reference to the drawings. In the description of the following drawings, the same or similar symbols are given to the same or similar parts. However, it should be noted that the drawings are schematic, and the ratios of the dimensions are different from the actual ones. Therefore, the specific dimensions and the like should be judged by considering the following instructions. In addition, the diagrams of each other will of course contain different dimensions and proportions of each other. First, the structure ‘ of the absorbent article 1 manufactured by the method for producing an absorbent article according to the present embodiment will be described with reference to the drawings. Fig. 1 is a plan view showing the absorbent article 1 of the present embodiment. Fig. 2 is a cross-sectional view showing the absorbent article 1 of the present embodiment (A-A cross-sectional view of Fig. 1). Fig. 3 is a cross-sectional view showing the absorbent article 1 of the present embodiment (Fig. 1B-B cross-sectional view of 201117780). Further, in the present embodiment, the absorbent article 1 is an unfolded disposable diaper. As shown in the first to third figures, the absorbent article 1 has a vertically long shape from the periphery of the wearer's front chin (abdominal side) toward the circumference of the chin (back side) (hereinafter referred to as the longitudinal direction L). The absorbent article 1 has, in the longitudinal direction L, a peripheral surrounding area S1 corresponding to the front sac of the wearer, a peripheral surrounding area S2 corresponding to the wearer's posterior condyle, and a kneeling position corresponding to the wearer. The underarm region S 3 between the front sulcus surrounding area S 1 and the posterior condyle surrounding area S 2 . In the width direction W orthogonal to the longitudinal direction L, the absorbent article 1 has a central region C1 including an absorbent body 30 to be described later, and a side opposite to the outer side of the central region C1 in the width direction W. Part area C 2. Such an absorbent article 1 includes a surface sheet 1 〇, a back sheet 20, and an absorber 30. Further, the absorbent article 1 is provided with a waist flap portion 40 and a side flap portion 50. The surface sheet 10 is disposed on one side that contacts the wearer's skin. The surface sheet 10 is disposed so as to surround the absorber. The 〇β surface sheet 10 is formed of a liquid permeable sheet such as a hydrophilic nonwoven fabric or a woven fabric, an open plastic film, or an open hydrophobic nonwoven fabric. The back sheet 20 is provided on the outer side of the absorbent article 1 when worn. The back sheet 20 is a sheet-like underlayer film 20 Α (first sheet-like material) which is impermeable to liquid (for example, polyethylene), and a sheet-like underlayer nonwoven fabric 20 provided on the outer side of the underlying film 20 Β. (2nd sheet material). -8 - 201117780 The thickness of the base film 20A in the width direction W after the stretching process (after stretching) described later is shorter than the length W in the width direction W of the underlying nonwoven fabric 20B, but longer than the length W in the width direction W of the absorber 30. . Such a back sheet 20 is a composite sheet which is formed by laminating a plurality of sheet-like materials. Further, the back sheet 20 will be described in detail later. The absorber 30 is disposed between the surface sheet 10 and the back sheet 20. The absorbent body 30 absorbs the body fluid of the wearer. The absorbent body 30 is a coated material 30B comprising a mixed powder such as pulverized pulp or a superabsorbent polymer, and a coated material such as a tissue coated with the mixed powder 30A. The waist flap portion 40 is provided in the front side peripheral region S1 and the posterior condyle surrounding region S2 in the longitudinal direction L. The waist flap portion 40 has a front flap portion 40A located at one of the front sill regions S1 and a rear flap portion 40B located at a pair of the sill surrounding region S2. The front side flap portion 40A is formed by extending the side sheet 60 attached to the back sheet 20 toward the outside in the width direction W. Further, instead of the side sheet 60, the bottom sheet nonwoven fabric 20B may be extended to form the front side flap portion 40A. Similarly to the front flap portion 4A, the rear flap portion 40B is formed by extending the side sheet 60 toward the outside in the width direction W. Similarly to the front flap portion 40A, instead of the side sheet 60, the bottom sheet nonwoven fabric 20B may be extended to form the rear flap portion 4B. A locking portion 41 for locking the region around the front sill S1 is provided on the surface on the side where the absorber 30 of the rear side flap portion 40B is provided. The locking portion 4 is formed, for example, by a fastening tape. In this case, the fastening tape becomes a male member, and the female member (the engaged portion) is provided in the region where the locking portion 41 of the front sill surrounding area S1 is locked. Further, the front sill area S1 is composed of a -9 - 201117780 woven fabric, and the front sill area S1 itself may function as a locked portion. The side flap portion 50 is provided along the longitudinal direction L outside the width direction W of the absorber 30. A strip-shaped body 51 made of a rubber (for example, polyurethane) having elasticity in the longitudinal direction L is provided in the side flap portion 5A. The strip 51 is joined to the back sheet 20 in a state of being elongated in the longitudinal direction L. The strip body 5 1 includes the first strip-shaped body 5 1 A, the second strip-shaped body 51B, the third strip-shaped body 51C, and the fourth strip-shaped body 51D from the inner side toward the outer side in the width direction W. Next, the structure of the back sheet 20 described above will be described with reference to the drawings. Fig. 4(a) shows the ductility of the back sheet 20 of the present embodiment. Fig. 4(b) is a graph showing the ductility of the back sheet 20 of the present embodiment. Fig. 5(a) is a plan view showing the back sheet 20 of the present embodiment. Fig. 5(b) is an enlarged cross-sectional view showing the back sheet 20 of the present embodiment (A-A cross-sectional view of Fig. 5(a)). As shown in Figs. 4(a) and 4(b), the ductility of the underlayer nonwoven fabric 20B constituting the back sheet 20 is smaller than that of the underlayer film 20A. As shown in Fig. 5(a), the underlayer film 20A constituting the back sheet 20 has an extending portion 21 and an unextended portion 22. Further, the underlayer of the back sheet 20 is formed. The nonwoven fabric 20B is not subjected to the stretching process. The extending portion 21 is a region formed by pressing the underlying film 20A toward the thickness direction T of the underlying film 20 A. That is, the extension portion 21 is made to have a basis weight (mass per unit area) smaller than that of the unextended portion 22 by performing the stretching process. As shown in Fig. 5(b), the extending portion 2 1 alternately forms a thick portion 2 1 L having a large amount of extension and a dense portion 2 1 T having a smaller expansion amount than the thick portion 2 1 L. Rough 2 1 L and
S -10- 201117780 密部21 T是在長邊方向L呈連續的，且配設成在寬度方向W 排列複數個的狀態。 延伸部21係具有：位於中央區域C1之中央延伸部分 2 1 A、位於側部區域C2的一部分之端部延伸部分2 1 B。中 央延伸部分2 1 A的延伸量較佳爲比端部延伸部分2 1 B的延伸 量更大。又在本實施形態之側部區域C2的一部分，是指除 了緣部區域C3 (包含位於寬度方向W外側的緣部分20E ) 以外之***區域S 3。 在此，端部延伸部分2 1 B不一定要設置在側部區域C2 的一部分。設置在側部區域C2整個區域亦可，如第6圖所 示，不設置在胯F區域S3亦可。又中央延伸部分21A，不一 定要設置在中央區域C1整個區域，設置在中央區域C1的至 少一部分即可，例如第5圖所示，設置在除了緣部區域C4 (包含位於長邊方向L外側的緣部分20E)以外之中央區域 C 1亦可。 這樣的延伸部2 1較佳爲，相對於實施延伸加工前之背 面薄片20，以3.0倍以下進行擴張。此外，延伸部21，是 以沿寬度方向W擴寬而成爲平坦狀態下與底層不織布20B 接合（參照第7圖）。 未延伸部22，是未朝厚度方向T將底層薄膜20A按壓的 區域。亦即，未延伸部22，是除了延伸部2 1以外的區域。 未延伸部22，不同於延伸部21，在寬度方向W並未被延伸 。未延伸部2 2是設置於一對的側部區域C 2。 接著’針對製造上述吸收性物品1的吸收性物品之製 -11 - 201117780 造方法，參照圖式來作說明。第7圖係本實施形態的吸收 性物品之製造方法的說明圖。 如第7圖所示，吸收性物品之製造方法，係用來製造 至少具備背面薄片20和吸收體30之吸收性物品1。具體而 言，吸收性物品之製造方法係具備：薄片加熱步驟S 1 0、 薄片延伸步驟S20、薄片擴寬步驟S30、薄片貼合步驟S40 、吸收體接合步驟S50、帶狀體配置步驟S60、側翼片形成 步驟S70、腰翼片配置步驟S80、製品切斷步驟S90。 在薄片加熱步驟S10，是藉由後述的加熱輥510，一邊 將底層薄片120A (連續的底層薄膜20A )沿著搬運方向（ 以下稱機械方向MD)搬運一邊將底層薄片12 0A加熱。 在薄片延伸步驟S20，是藉由後述的壓花輥機構520， 將加熱後的底層薄片120A朝底層薄片12 0A的厚度方向T按 壓。藉此，在底層薄片120 A的寬度方向W(亦即與機械方 向MD正交之交叉方向CD )將底層薄片120A延伸，以在底 層薄片120A形成延伸部21及未延伸部22。又中央延伸部分 2 1 A的延伸量較佳爲比端部延伸部分2 1 B的延伸量更大。 在薄片擴寬步驟S30，是藉由後述的擴寬輥機構600， 將延伸後的底層薄片120A朝向底層薄片120A的寬度方向W 外側擴寬（擴張）成平坦狀。 在薄片貼合步驟S40，是將擴寬後的底層薄片120 A和 不織布薄片120B (連續的底層不織布20B )貼合而形成複 合薄片120。這時，底層薄片120 A是以延伸部21朝寬度方 向W擴寬而成爲平坦狀態下貼合於不織布薄片120B。 201117780 在吸收體接合步驟S50，是將接合有表面薄片10的吸 收體30接合（載置）在所形成的複合薄片120上。 在帶狀體配置步驟S60，是在相對於複合薄片120的機 械方向MD將帶狀體51伸長的狀態下，將該帶狀體51對應 於吸收體30之寬度方向W外側配置在複合薄片120上。 在側翼片形成步驟S70，將比底層薄片120A更朝寬度 方向W外側延伸之不織布薄片120B朝寬度方向W內側折返 ，藉由該不織布薄片120B包住帶狀體51而形成側翼片部50 〇 在腰翼片配置步驟S80，將事先形成的前側翼片部40A 和安裝有卡止部41之後側翼片部40B接合於複合薄片120。 在製品切斷步驟S90，將設有吸收體30、側翼片部50 及腰翼片部40之複合薄片120沿著寬度方向W切斷成單一 製品的大小，而製造出吸收性物品1。 接著，針對上述薄片加熱步驟S10及薄片延伸步驟S20 所使用的延伸裝置500的構造，參照圖式來作說明。第8 ( a)圖係顯示本實施形態的延伸裝置500之一部分的放大立 體圖。第8 ( b )圖係本實施形態之壓花輥機構520的軸向 截面圖。 如第8 (a)圖所示，延伸裝置500，是將底層薄片 1 20A—邊沿著機械方向MD搬運一邊朝交叉方向CD延伸。 延伸裝置500係具備加熱輥510和壓花輥機構520。 加熱輥510是設置成比壓花輥機構5 2 0更靠近機械方向 MD的上游側。加熱輥5 1 0，是一邊沿著機械方向MD旋轉 -13- 201117780 ，一邊在底層薄片120A通過壓花輥機構520之前將底層薄 片120A加熱。加熱輥510是設定成既定溫度（例如1〇〇度） 〇 壓花輥機構520，是將通過加熱輥510之底層薄片120A 加熱，並朝底層薄片120A之厚度方向T將底層薄片120A按 壓。壓花輥機構520是設定成既定溫度（例如60度）。S -10- 201117780 The dense portion 21 T is continuous in the longitudinal direction L and is disposed in a state in which a plurality of the width portions W are arranged. The extending portion 21 has a central extending portion 2 1 A located at the central portion C1 and an end extending portion 2 1 B at a portion of the side portion C2. The amount of extension of the central extension portion 2 1 A is preferably greater than the extension of the end extension portion 2 1 B. Further, a part of the side portion region C2 of the present embodiment means a crotch region S3 excluding the edge portion region C3 (including the edge portion 20E located outside the width direction W). Here, the end extension portion 2 1 B does not have to be provided in a part of the side portion region C2. The entire area of the side area C2 may be provided, as shown in Fig. 6, and may not be provided in the 胯F area S3. Further, the central extending portion 21A is not necessarily provided in the entire area of the central portion C1, and may be provided at least a part of the central portion C1. For example, as shown in FIG. 5, it is disposed in addition to the edge portion C4 (including the outer side in the longitudinal direction L). The central region C 1 other than the edge portion 20E) may also be used. It is preferable that such an extending portion 21 is expanded by 3.0 times or less with respect to the back sheet 20 before the stretching process. Further, the extending portion 21 is joined to the underlying nonwoven fabric 20B in a flat state by being widened in the width direction W (see Fig. 7). The unextended portion 22 is a region where the underlying film 20A is not pressed in the thickness direction T. That is, the unextended portion 22 is an area other than the extension portion 21. The unextended portion 22, unlike the extension portion 21, is not extended in the width direction W. The unextended portion 22 is a side portion C 2 provided in a pair. Next, the manufacturing method of the absorbent article for producing the absorbent article 1 will be described with reference to the drawings. Fig. 7 is an explanatory view showing a method of producing an absorbent article of the present embodiment. As shown in Fig. 7, the method for producing an absorbent article is for producing an absorbent article 1 having at least a back sheet 20 and an absorbent body 30. Specifically, the method for producing an absorbent article includes a sheet heating step S 10 , a sheet extending step S20, a sheet widening step S30, a sheet bonding step S40, an absorber bonding step S50, a strip arrangement step S60, The side panel forming step S70, the waist flap disposing step S80, and the product cutting step S90. In the sheet heating step S10, the underlying sheet 120A is heated while the underlying sheet 120A (continuous underlayer film 20A) is conveyed in the conveyance direction (hereinafter referred to as the machine direction MD) by the heating roller 510 which will be described later. In the sheet extending step S20, the heated underlayer sheet 120A is pressed in the thickness direction T of the underlying sheet 120A by an embossing roll mechanism 520 which will be described later. Thereby, the underlying sheet 120A is extended in the width direction W of the underlying sheet 120A (i.e., the crossing direction CD orthogonal to the machine direction MD) to form the extending portion 21 and the unextended portion 22 in the underlying sheet 120A. Further, the amount of extension of the central extension portion 2 1 A is preferably larger than the amount of extension of the end extension portion 2 1 B. In the sheet widening step S30, the stretched underlying sheet 120A is widened (expanded) outward in the width direction W of the underlying sheet 120A by the widening roller mechanism 600 which will be described later. In the sheet bonding step S40, the expanded underlayer sheet 120A and the nonwoven sheet 120B (continuous underlayer nonwoven fabric 20B) are bonded together to form a composite sheet 120. At this time, the underlying sheet 120 A is bonded to the nonwoven fabric sheet 120B in a flat state in which the extending portion 21 is widened in the width direction W. 201117780 In the absorber joining step S50, the absorbent body 30 to which the surface sheet 10 is bonded is joined (mounted) on the formed composite sheet 120. In the strip arrangement step S60, the strip 51 is placed on the composite sheet 120 in the width direction W of the absorber 30 in a state in which the strip 51 is extended in the machine direction MD of the composite sheet 120. on. In the side panel forming step S70, the non-woven fabric sheet 120B extending outward in the width direction W from the underlying sheet 120A is folded back toward the inner side in the width direction W, and the strip-shaped body 51 is wrapped by the nonwoven fabric sheet 120B to form the side flap portion 50. In the waist flap arrangement step S80, the front side flap portion 40A formed in advance and the side flap portion 40B on which the locking portion 41 is attached are joined to the composite sheet 120. In the product cutting step S90, the composite sheet 120 provided with the absorbent body 30, the side panel portion 50, and the waist flap portion 40 is cut into a single product in the width direction W to produce the absorbent article 1. Next, the structure of the extension device 500 used in the sheet heating step S10 and the sheet extending step S20 will be described with reference to the drawings. Fig. 8(a) is an enlarged perspective view showing a part of the extension device 500 of the present embodiment. Fig. 8(b) is an axial sectional view of the embossing roll mechanism 520 of the present embodiment. As shown in Fig. 8(a), the extension device 500 extends the bottom sheet 1 20A side along the machine direction MD while extending in the intersecting direction CD. The extension device 500 is provided with a heating roller 510 and an embossing roller mechanism 520. The heating roller 510 is disposed on the upstream side of the embossing roller mechanism 520 closer to the machine direction MD. The heating roller 510 is heated while rotating in the machine direction MD -13 - 201117780 while heating the underlying film 120A before the underlying sheet 120A passes through the embossing roll mechanism 520. The heating roller 510 is set to a predetermined temperature (for example, 1 Torr). The embossing roller mechanism 520 heats the underlying sheet 120A passing through the heating roller 510 and presses the underlying sheet 120A toward the thickness direction T of the underlying sheet 120A. The embossing roller mechanism 520 is set to a predetermined temperature (for example, 60 degrees).
這樣的壓花輥機構520，如第8(b)圖所示，是由在 外周形成複數個凸部（所謂延伸刀）且隔著底層薄片12 0A 在一方凸部532間嵌合另一方凸部542之一對輥機構所構成 〇 凸部5 3 2及凸部542的形狀，在輥機構之軸芯方向的截 面上，是從輥機構的外周朝向外側形成漸細狀。在本實施 形態，凸部532及凸部542的形狀，在輥機構之軸芯方向的 截面上是形成大致三角形。 凸部53 2及凸部542是使用肥粒鐵系不鏽鋼（SUS430 2B )。例如，凸部532的厚度tl及及凸部542的厚度t2分別 爲0.7〜1.0mm。又在凸部5 3 2及凸部542的外表面，較佳爲 實施硏磨加工。 在這樣的延伸裝置5 00，例如加熱輥5 1 0的溫度爲1 00 度。壓花輥機構520的溫度爲60度。凸部53 2和凸部542嵌 合時之與輥機構的軸芯方向正交的方向上之長度（L)爲 1.6mm。複數個凸部532的間隔（pi )及複數個凸部542的 間隔（p2 )爲2.5mm。依據此條件，延伸裝置500相對於實 施延伸加工前的底層薄片120A，可對底層薄片120A實施 δ -14- 201117780 1 . 3倍的擴張加工。 此外，在延伸裝置500，藉由適當改變上述各條件， 可改變底層薄片120A朝寬度方向W延伸的倍率（延伸倍率 )。此外，對應於底層薄片120A之中央區域C1和側部區域 C2，而使凸部532或凸部542的高度形成不同亦可。藉此， 可改變中央區域C 1的延伸倍率和側部區域C 2的延伸倍率。 接著，針對上述薄片擴寬步驟S30所使用之擴寬輥機 構600的構造，參照圖式來作說明。第9圖係顯示本實施形 態之擴寬輥機構600之立體圖。 如第9圖所示，擴寬輥機構600，是將藉由壓花輥機構 520延伸後之底層薄片120A，朝向底層薄片120A之交叉方 向CD外側擴寬成平坦狀。結果，設置於延伸部2 1之微小凹 凸（粗部21L及密部21T)變平坦，且將延伸部21擴寬。擴 寬輥機構600係具備第1擴張輥機構610和第2擴張輥機構 620 ° 第1擴張輥機構610 ’是挾持底層薄片120A之一側部 1 2 0 E ,。第1擴張輥機構6 1 0係具備第1上側按壓輥6 1 1和第1 下側按壓輥6 1 2。 第1上側按壓輥6 1 1配設於底層薄片1 2 〇 A之一面側（上 面側）。第1上側按壓輥6 1 1，在接觸底層薄片1 2 〇 A上面的 狀態下，以軸芯爲中心而沿著將底層薄片1 20A送出的送出 方向旋轉。 第1下側按壓輥6 1 2 ’是隔著底層薄片1 2 0 A配設在第1 上側按壓輥6 1 1的相反側（下面側）。在第1下側按壓輥 -15- 201117780 612和第1上側按壓輥611之間挾持底層薄片120A。第1下側 按壓輥612’在接觸底層薄片120A下面的狀態下，以軸芯 爲中心而沿著將底層薄片120A送出的送出方向旋轉^ 第1上側按壓輥6 1 1和第1下側按壓輥6 1 2，底層薄片 120A之中心線CL側是位在機械方向MD之前側。亦即，第1 上側按壓輥6 1 1和第1下側按壓輥6 1 2，在底層薄片1 20A俯 視下，相對於交叉方向CD呈傾斜的。藉此，第1上側按壓 輥611和第1下側按壓輥612可將底層薄片120A擴寬成平坦 狀。 第2擴張輥機構620，是挾持底層薄片120A之另一側部 120E2。第2擴張輥機構620係具備第2上側按壓輥621和第2 下側按壓輥622。又第2擴張輥機構620的構造與第1擴張輥 機構610是相同的。因此，省略第2擴張輥機構620的說明 〇 在這樣的擴寬輥機構600，藉由適當地改變第1上側按 壓輥611和第1下側按壓輥612相對於交叉方向CD的傾斜角 、第2上側按壓輥621和第2下側按壓輥622相對於交叉方向 CD的傾斜角，可改變底層薄片120A之擴寬程度。 在以上所說明之本實施形態，在將底層薄片1 2 0 A延伸 之後，將延伸後的底層薄片120A貼附於不織布薄片120B。 亦即，不是將延性不同的底層薄片120A和不織布薄片120B 一起實施延伸加工，而僅對底層薄片120A實施延伸加工。 藉此，由於延性比底層薄片120 A小之不織布薄片120B不進 行延伸，不織布薄片120B不容易遭受生產速度的高速化所As shown in Fig. 8(b), the embossing roller mechanism 520 has a plurality of convex portions (so-called extension knives) formed on the outer circumference, and the other convex portion 532 is fitted between the convex portions 532 via the bottom sheet 12A. The shape of the convex portion 5 3 2 and the convex portion 542 formed by one of the pair of roller portions 542 is tapered from the outer circumference of the roller mechanism toward the outer side in the cross section of the roller mechanism in the axial direction. In the present embodiment, the shape of the convex portion 532 and the convex portion 542 is substantially triangular in cross section in the axial direction of the roller mechanism. The convex portion 53 2 and the convex portion 542 are made of ferrite-based iron-based stainless steel (SUS430 2B). For example, the thickness t1 of the convex portion 532 and the thickness t2 of the convex portion 542 are respectively 0.7 to 1.0 mm. Further, it is preferable to perform honing processing on the outer surfaces of the convex portion 5 3 2 and the convex portion 542. In such an extension device 500, for example, the temperature of the heating roller 5 10 is 100 degrees. The temperature of the embossing roll mechanism 520 is 60 degrees. The length (L) in the direction orthogonal to the axial direction of the roller mechanism when the convex portion 53 2 and the convex portion 542 are fitted is 1.6 mm. The interval (pi) of the plurality of convex portions 532 and the interval (p2) of the plurality of convex portions 542 are 2.5 mm. According to this condition, the stretching device 500 can perform the expansion processing of δ -14 - 201117780 1.3 times with respect to the underlying sheet 120A with respect to the underlying sheet 120A before the extension processing. Further, in the stretching device 500, the magnification (stretching magnification) of the underlying sheet 120A extending in the width direction W can be changed by appropriately changing the above respective conditions. Further, the heights of the convex portions 532 or the convex portions 542 may be different depending on the central portion C1 and the side portion C2 of the underlying sheet 120A. Thereby, the stretching ratio of the central region C 1 and the stretching ratio of the side region C 2 can be changed. Next, the structure of the widening roller mechanism 600 used in the above-described sheet widening step S30 will be described with reference to the drawings. Fig. 9 is a perspective view showing the widening roller mechanism 600 of the present embodiment. As shown in Fig. 9, the widening roller mechanism 600 is formed by widening the outer layer sheet 120A extended by the embossing roll mechanism 520 toward the outer side of the cross direction CD of the underlying sheet 120A. As a result, the minute projections (the thick portion 21L and the dense portion 21T) provided in the extending portion 21 are flattened, and the extending portion 21 is widened. The widening roller mechanism 600 includes a first expansion roller mechanism 610 and a second expansion roller mechanism 620 °. The first expansion roller mechanism 610 ' holds one side portion 1 2 0 E of the bottom sheet 120A. The first expansion roll mechanism 6 1 0 includes a first upper pressing roller 6 1 1 and a first lower pressing roller 6 1 2 . The first upper pressing roller 6 1 1 is disposed on one surface side (upper side) of the underlying sheet 1 2 〇 A. The first upper pressing roller 6 1 1 rotates in the feeding direction in which the underlying sheet 1 20A is fed, centering on the axis core while being in contact with the upper surface of the underlying sheet 1 2 〇 A. The first lower pressing roller 6 1 2 ' is disposed on the opposite side (lower side) of the first upper pressing roller 61 1 through the underlying sheet 1 2 0 A. The underlying sheet 120A is held between the first lower pressing roller -15-201117780 612 and the first upper pressing roller 611. When the first lower pressing roller 612' is in contact with the lower surface of the underlying sheet 120A, the first lower pressing roller 6 1 1 and the first lower pressing are rotated in the feeding direction in which the lower sheet 120A is fed around the core. The roller 6 1 2, the center line CL side of the underlying sheet 120A is located on the front side in the machine direction MD. That is, the first upper pressing roller 61 1 and the first lower pressing roller 6 1 2 are inclined with respect to the intersecting direction CD in the bottom sheet 1 20A. Thereby, the first upper pressing roller 611 and the first lower pressing roller 612 can widen the base sheet 120A into a flat shape. The second expansion roll mechanism 620 holds the other side portion 120E2 of the bottom sheet 120A. The second expansion roll mechanism 620 includes a second upper pressing roller 621 and a second lower pressing roller 622 . Further, the structure of the second expansion roller mechanism 620 is the same as that of the first expansion roller mechanism 610. Therefore, the description of the second expansion roller mechanism 620 is omitted. In the above-described widening roller mechanism 600, the inclination angle of the first upper pressing roller 611 and the first lower pressing roller 612 with respect to the intersecting direction CD is appropriately changed. The inclination angle of the upper pressing roller 621 and the second lower pressing roller 622 with respect to the intersecting direction CD can change the degree of widening of the underlying sheet 120A. In the present embodiment described above, after the underlying sheet 1 2 0 A is stretched, the stretched underlayer sheet 120A is attached to the nonwoven sheet 120B. That is, the underlying sheet 120A and the non-woven sheet 120B having different ductility are not subjected to the stretching process, and only the underlying sheet 120A is subjected to the stretching process. Thereby, since the non-woven fabric sheet 120B having a ductility smaller than that of the underlying sheet 120A is not stretched, the nonwoven fabric sheet 120B is less likely to be subjected to an increase in production speed.
-16- 201117780 帶來之損傷。因此，可減少不織布薄片12 OB之製造不良， 可抑制製造良率的降低。因此，可實現生產速度的高速化 ，且能使背面薄片20 (底層薄片1 20A )變柔軟，而能抑制 製品品質的降低。 此外，在習知技術，在對底層薄片1 20 A和不織布薄片 120B實施延伸加工的情況’必須配合不織布薄片120B的延 性來實施延伸加工。相對於此，在本實施形態，由於僅對 延性比不織布薄片120B大之底層薄片120A實施延伸加工， 能使底層薄片120A的延伸量變得更多。因此，可減少投入 製造線之底層薄片120 A的資材量，可謀求製造成本的降低 〇 在本實施形態，中央延伸部分2 1 A的延伸量較佳爲比 端部延伸部分21B的延伸量更大。又底層薄片120 A是以被 朝向機械方向MD拉伸的狀態進行搬運。因此，在機械方 向MD有張力作用於底層薄片120A，底層薄片120A的緣部 容易朝向寬度方向內側縮入（容易發生所謂縮頸現象）。 因此，對底層薄片120A的端部延伸部分21B不容易實施均 等的延伸加工。因此，將中央延伸部分2 1 A的延伸量積極 地加大，能使底層薄片120A整體朝寬度方向W之延伸程度 成爲一定。 在本實施形態，底層薄膜20A之延伸後的寬度方向W 的長度，是比底層不織布2 0B之寬度方向W的長度短，且 比吸收體30之寬度方向W的長度更長。亦即，設有底層薄 膜20A和底層不織布20B不重疊的部分。如此，被吸收體30 -17- 201117780 吸收之穿戴者的體液不容易朝向底層不織布2 OB (亦即， 吸收性物品1的外側）漏出，可提昇側部區域C2之通氣性 〇 在本實施形態，底層薄膜20A (延伸後的底層薄片 120A)是設置於***區域S3。如此，在前胴周圍區域S1或 後胴周圍區域S2不設置底層薄膜20A的情況，可減少底層 薄片120 A之資材量，可謀求製造成本的降低，並提昇前胴 周圍區域S1或後胴周圍區域S2之通氣性。 在本實施形態，是在薄片延伸步驟S20和薄片貼合步 驟S4 0之間進行薄片擴寬步驟S30。亦即，藉由壓花輥機構 .520來按壓底層薄片120A以形成設有微小凹凸（粗部21L及 密部2 1 T )之延伸部2 1。接著，藉由擴寬輥機構600將底層 薄片120A擴寬成使一旦形成之微小凹凸變平（平坦狀）。 接著，底層薄片120A以一旦形成之微小凹凸成爲平坦狀的 狀態和不織布薄片120B接合。 然而，由於底層薄片120 A是以被朝向機械方向MD拉 伸的狀態進行搬運，可能會發生底層薄片1 20A的寬度變窄 的現象（所謂縮頸現象）。但在本實施形態，如上述般， 是在擴張成平坦狀之底層薄片120 A上接合不織布薄片120B 。亦即，在一旦成爲平坦狀之底層薄片120 A的寬度變窄之 前，在底層薄片1 20A上接合不織布薄片1 20B。因此，微小 凹凸可維持平坦狀。因此，可減少投入製造線之底層薄片 120A的資材量，又即使背面薄片20接觸穿戴者的情況，也 能確實地避免對穿戴者造成不適感。 -18- 201117780 此外，凸部5 3 2及凸部5 4 2是使用肥粒鐵系不鏽鋼（ SUS430 2B)。例如，凸部532的厚度tl及及凸部542的厚 度t2分別爲0.7〜l』mm。如此’可考慮凸部5 3 2及凸部542 的耐久性並實現生產速度的高速化，且能使背面薄片2 0 ( 底層薄片120A )變柔軟。 在凸部5 3 2及凸部542的外表面，較佳爲實施硏磨加工 。如此，相較於在凸部5 3 2及凸部542的外表面未實施硏磨 加工的情況，可減少凸部5 3 2及凸部542和底層薄片120A的 摩擦。因此可抑制底層薄片1 20A上之穿孔（針孔）發生。 (變更例） 上述實施形態之壓花輥機構520如以下所示般進行變 更亦可。又對於與上述實施形態之壓花輥機構520相同的 部分是賦予相同的符號，主要是針對不同的部分作說明。 第10圖係變更例之壓花輥機構520A的軸向截面圖。在 上述實施形態’凸部532及凸部542的形狀，在輥機構之軸 芯方向的截面上是形成大致三角形。相對於此，在變更例 ，如第1 〇 ( a )圖所示，凸部5 3 2及凸部542的形狀，在輥 機構之軸芯方向的截面上是形成大致矩形。在凸部532及 凸部542是實施倒圓角（例如圓角〇_2mm)。又在凸部532 及凸部542’當然並不一定要實施倒圓角。 在此，凸部5 3 2及凸部5 4 2的形狀如第1 〇 ( b )圖所示 ，在輥機構之軸芯方向的截面上是形成大致梯形亦可。在 此情況較佳爲’形成凸部5 3 2及凸部542的各個側面彼此， 19- 201117780 以相對於與輥機構的軸芯方向正交的方向呈既定角度α ( 例如30〜90度）傾斜的狀態相對置。 (其他實施形態） 以上是透過本發明的實施形態來揭示本發明的內容’ 但應理解，構成該揭示的一部分之論述及圖式並非用來限 定本發明。根據該揭示所屬技術領域具有通常知識者可明 白有各種的替代實施形態、實施例及運用技術。 例如，本發明的實施形態可如下述般進行變更。具體 而言，關於吸收性物品1的構造’並不限定於實施形態所 說明的，當然可按照目的來設定。例如，吸收性物品1雖 是說明展開型的紙尿布，但並不限定於此，亦可爲褲型的 紙尿布、衛生棉、護墊等。 此外，表面薄片1〇、背面薄片20、吸收體30、腰翼片 部40及側翼片部50，並不限定於實施形態所說明的構造， 採用不同的構造亦可，而能按照目的進行適當的變更。例 如，設置於後側翼片部40Β之卡止部41，雖是說明藉由黏 扣帶來形成的，但並不限定於此，也能使用膠帶等來形成 。此外，帶狀體51雖是說明橡膠製的，但並不限定於此， 例如亦可爲具有伸縮性的薄片，只要是具有伸縮性的構件 即可。 此外，延伸裝置5 00，雖是說明用來在底層薄膜20Α形 成延伸部2 1的例子，但採用其他構造亦可，只要是能在背 面薄片20形成延伸部21即可。例如，延伸裝置500不一定 -20- 201117780 要具備加熱輥510和壓花輥機構520 ’僅由壓花輥機構520 構成亦可。 此外，擴寬輥機構600，雖是說明具備第1擴寬輥機構 6 10、第2擴寬輥機構620的例子’但並不限定於此，只要 至少具備任一方即可，在底層薄片120A之一側部120£!或 另一側部120E2側將底層薄片12〇Α擴寬亦可。 此外，吸收性物品之製造方法，雖是說明具有薄片加 熱步驟S10〜製品切斷步驟S90，但並不限定於此，只要至 少具備薄片延伸步驟S20、薄片貼合步驟S40、吸收體接合 步驟S5 0即可，當然可按照目的而適當地設定》 此外，吸收性物品之製造方法，雖是說明對底層薄膜 20A實施延伸加工的例子，但並不限定於此，除了底層薄 膜20A以外，有別於底層薄膜20A而另外對底層不織布20B 也實施延伸加工亦可。在此情況較佳爲，配合與底層薄膜 20A的延性不同之底層不織布20B的延性來改變延伸程度。 此外，在吸收性物品之製造方法，雖是說明對底層薄 膜20A實施延伸加工的例子，但並不限定於此，亦可對其 他薄片實施延伸加工。例如，在表面薄片10是由兩片薄片 構成的情況，可對延性較大的薄片實施延伸加工。 如此般，本發明當然包含未記載於此之各種實施形態 等。因此，本發明的技術範圍，是藉由根據上述說明適當 的申請專利範圍之發明界定事項來界定。 【圖式簡單說明】 -21 - 201117780 第1圖係顯示本實施形態的吸收性物品1之俯視圖。 第2圖係顯示本實施形態的吸收性物品1之截面圖（第 1圖的A-A截面圖）。 第3圖係顯示本實施形態的吸收性物品1之截面圖（第 1圖的B-B截面圖）。 第4 ( a )圖係顯示本實施形態之背面薄片20的延性。 第4 ( b )圖係顯示本實施形態之背面薄片20的延性的曲線 圖。 第5 ( a )圖係顯示本實施形態之背面薄片2 0的俯視圖 。第5 ( b )圖係顯示本實施形態之背面薄片20之放大截面 圖（第5(〇圖的A-A截面圖）。 第6圖係本實施形態之底層薄膜20A單獨的俯視圖。 第7圖係本實施形態的吸收性物品之製造方法的說明 圖。 第8 ( a )圖係顯示本實施形態的延伸裝置5 00之一部 分的放大立體圖。第8(b)圖係本實施形態之壓花輥機構 520的軸向截面圖。 第9圖係顯示本實施形態之擴寬輥機構600之立體圖。 第10圖係變更例之壓花輥機構5 20A的軸向截面圖。 【主要元件符號說明】 1 :吸收性物品 10 :表面薄片 20 :背面薄片-16- 201117780 The damage caused. Therefore, manufacturing defects of the nonwoven fabric sheet 12 OB can be reduced, and reduction in manufacturing yield can be suppressed. Therefore, the speed of production can be increased, and the back sheet 20 (the underlayer sheet 20A) can be made soft, and the deterioration of the quality of the product can be suppressed. Further, in the prior art, in the case where the underlying sheet 126A and the non-woven sheet 120B are subjected to the stretching process, it is necessary to carry out the stretching process in accordance with the ductility of the nonwoven fabric sheet 120B. On the other hand, in the present embodiment, since only the underlying sheet 120A having a longer ductility than the nonwoven sheet 120B is subjected to the stretching process, the amount of stretching of the underlying sheet 120A can be increased. Therefore, the amount of the material of the underlying sheet 120 A to be placed in the manufacturing line can be reduced, and the manufacturing cost can be reduced. In the present embodiment, the amount of extension of the central extension portion 2 1 A is preferably more than the amount of extension of the end portion extending portion 21B. Big. Further, the underlying sheet 120 A is conveyed in a state of being stretched toward the machine direction MD. Therefore, the tension in the machine direction MD acts on the underlying sheet 120A, and the edge portion of the underlying sheet 120A is easily retracted toward the inner side in the width direction (the so-called necking phenomenon is likely to occur). Therefore, it is not easy to perform uniform stretching processing on the end extension portion 21B of the underlying sheet 120A. Therefore, the amount of extension of the central extension portion 2 1 A is actively increased, and the degree of extension of the entire underlying sheet 120A in the width direction W can be made constant. In the present embodiment, the length in the width direction W of the underlying film 20A after stretching is shorter than the length W in the width direction W of the underlying nonwoven fabric 20B, and is longer than the length in the width direction W of the absorber 30. That is, a portion where the underlying film 20A and the underlying non-woven fabric 20B do not overlap is provided. In this manner, the body fluid of the wearer absorbed by the absorbent body 30 -17- 201117780 does not easily leak toward the bottom nonwoven fabric 2 OB (that is, the outer side of the absorbent article 1), and the air permeability of the side region C2 can be improved. The underlayer film 20A (the extended underlying sheet 120A) is disposed in the underarm region S3. As described above, in the case where the underlying film 20A is not provided in the front sill area S1 or the sill surrounding area S2, the amount of the underlying sheet 120 A can be reduced, the manufacturing cost can be reduced, and the area around the front sill or the back sill can be raised. Ventilation of zone S2. In the present embodiment, the sheet widening step S30 is performed between the sheet extending step S20 and the sheet bonding step S40. That is, the underlying sheet 120A is pressed by the embossing roll mechanism .520 to form the extending portion 21 which is provided with minute irregularities (the thick portion 21L and the dense portion 2 1 T ). Next, the underlying sheet 120A is widened by the widening roller mechanism 600 so that the minute irregularities once formed are flattened (flat). Then, the underlying sheet 120A is joined to the non-woven sheet 120B in a state in which the minute irregularities formed are flat. However, since the underlying sheet 120 A is conveyed in a state of being stretched toward the machine direction MD, a phenomenon in which the width of the underlying sheet 1 20A is narrowed (so-called necking phenomenon) may occur. However, in the present embodiment, as described above, the nonwoven fabric sheet 120B is joined to the underlying sheet 120A which is expanded into a flat shape. That is, the nonwoven fabric sheet 20B is joined to the underlying sheet 1 20A before the width of the flat sheet 120A which becomes flat is narrowed. Therefore, the minute irregularities can be maintained flat. Therefore, the amount of the material of the underlying sheet 120A which is put into the manufacturing line can be reduced, and even if the back sheet 20 contacts the wearer, the wearer can be surely prevented from being uncomfortable. -18- 201117780 In addition, the convex portion 5 3 2 and the convex portion 5 4 2 are made of ferrite-based iron-based stainless steel (SUS430 2B). For example, the thickness t1 of the convex portion 532 and the thickness t2 of the convex portion 542 are respectively 0.7 to 1 mm. Thus, the durability of the convex portion 5 3 2 and the convex portion 542 can be considered to increase the speed of production, and the back sheet 20 (the underlying sheet 120A) can be made soft. Preferably, the outer surface of the convex portion 523 and the convex portion 542 is subjected to honing processing. Thus, the friction between the convex portion 523 and the convex portion 542 and the underlying sheet 120A can be reduced as compared with the case where the honing processing is not performed on the outer surfaces of the convex portion 523 and the convex portion 542. Therefore, the occurrence of perforations (pinholes) on the underlying sheet 1 20A can be suppressed. (Modification) The embossing roller mechanism 520 of the above embodiment may be modified as described below. The same components as those of the embossing roller mechanism 520 of the above embodiment are denoted by the same reference numerals, and mainly the different portions will be described. Fig. 10 is an axial sectional view showing an embossing roller mechanism 520A of a modified example. In the above embodiment, the shape of the convex portion 532 and the convex portion 542 is substantially triangular in cross section in the axial direction of the roller mechanism. On the other hand, in the modified example, as shown in the first diagram (a), the shape of the convex portion 523 and the convex portion 542 is substantially rectangular in cross section in the axial direction of the roller mechanism. The convex portion 532 and the convex portion 542 are rounded (for example, rounded 〇_2 mm). Further, it is needless to say that the convex portion 532 and the convex portion 542' do not have to be rounded. Here, the shape of the convex portion 523 and the convex portion 524 may be substantially trapezoidal in cross section in the axial direction of the roller mechanism as shown in the first 〇 (b) diagram. In this case, it is preferable that each of the side faces forming the convex portion 523 and the convex portion 542 is at a predetermined angle α (for example, 30 to 90 degrees) with respect to a direction orthogonal to the axial direction of the roller mechanism. The tilted states are opposite each other. (Other Embodiments) The above description of the present invention is made by the embodiment of the present invention. It should be understood that the description and drawings which form a part of this disclosure are not intended to limit the invention. Various alternative embodiments, examples, and operational techniques will be apparent to those of ordinary skill in the art. For example, the embodiment of the present invention can be modified as follows. Specifically, the structure ' of the absorbent article 1 is not limited to that described in the embodiment, and can of course be set according to the purpose. For example, the absorbent article 1 is an unfolded type disposable diaper, but is not limited thereto, and may be a pants type diaper, sanitary napkin, pad or the like. Further, the surface sheet 1〇, the back sheet 20, the absorber 30, the waist flap portion 40, and the side panel portion 50 are not limited to the structures described in the embodiment, and may have different structures, and may be appropriately configured according to the purpose. Changes. For example, the locking portion 41 provided on the rear side flap portion 40A is formed by an adhesive tape. However, the present invention is not limited thereto, and may be formed using an adhesive tape or the like. In addition, the strip-shaped body 51 is not limited to this, and may be a stretchable sheet, for example, as long as it is a stretchable member. Further, although the extension device 500 is described as an example for forming the extension portion 21 in the underlying film 20, other structures may be employed as long as the extension portion 21 can be formed on the back sheet 20. For example, the extension device 500 does not have to be -20-201117780. It is also possible to provide the heating roller 510 and the embossing roller mechanism 520' only by the embossing roller mechanism 520. Further, the widening roller mechanism 600 is described as an example in which the first widening roller mechanism 610 and the second widening roller mechanism 620 are provided. However, the present invention is not limited thereto, and any one of them may be provided on the underlying sheet 120A. One side portion 120* or the other side portion 120E2 side may also widen the bottom sheet 12A. In addition, although the sheet heating step S10 to the product cutting step S90 are described, the method of manufacturing the absorbent article is not limited thereto, and at least the sheet extending step S20, the sheet bonding step S40, and the absorber joining step S5 are provided. 0 may be appropriately set according to the purpose. Further, although the method for producing an absorbent article describes an example in which the base film 20A is subjected to the stretching process, the present invention is not limited thereto, and the substrate film 20A is different. The underlayer film 20A may be additionally stretched to the underlayer non-woven fabric 20B. In this case, it is preferable to change the degree of elongation by blending the ductility of the underlying nonwoven fabric 20B which is different from the ductility of the underlying film 20A. Further, in the method for producing an absorbent article, an example in which the base film 20A is subjected to the stretching process is described. However, the present invention is not limited thereto, and the other sheets may be subjected to the stretching process. For example, in the case where the surface sheet 10 is composed of two sheets, the sheet having a large ductility can be subjected to stretching processing. As such, the present invention naturally includes various embodiments and the like which are not described herein. Therefore, the technical scope of the present invention is defined by the invention defining the scope of the appropriate patent application according to the above description. BRIEF DESCRIPTION OF THE DRAWINGS - 21 - 201117780 Fig. 1 is a plan view showing an absorbent article 1 of the present embodiment. Fig. 2 is a cross-sectional view showing the absorbent article 1 of the present embodiment (A-A cross-sectional view of Fig. 1). Fig. 3 is a cross-sectional view showing the absorbent article 1 of the present embodiment (B-B cross-sectional view of Fig. 1). The fourth (a) diagram shows the ductility of the back sheet 20 of the present embodiment. Fig. 4(b) is a graph showing the ductility of the back sheet 20 of the present embodiment. Fig. 5(a) is a plan view showing the back sheet 20 of the present embodiment. Fig. 5(b) is an enlarged cross-sectional view showing the back sheet 20 of the present embodiment (fifth (AA cross-sectional view of the drawing). Fig. 6 is a plan view showing the bottom film 20A of the present embodiment. Fig. 8(a) is an enlarged perspective view showing a part of the stretching device 500 of the embodiment. Fig. 8(b) is an embossing roll of the embodiment. The axial cross-sectional view of the mechanism 520. Fig. 9 is a perspective view showing the widening roller mechanism 600 of the present embodiment. Fig. 10 is an axial cross-sectional view of the embossing roller mechanism 5 20A of the modified example. 1 : absorbent article 10 : surface sheet 20 : back sheet
S -22- 201117780 20A :底層薄膜 20B:底層不織布 20E :緣部分 2 1 :延伸部 2 1 A :中央延伸部分 2 1 B :端部延伸部分 2 1 L :粗部 2 1 T :密部 22 :未延伸部 3 0 :吸收體 3 0A :混合粉體 3 〇 B :被覆材 40 :腰翼片部 40A :前側翼片部 40B :後側翼片部 41 :卡止部 50 :側翼片部 51 ( 51A〜51D ):帶狀體 6 0 :側薄片 120 :複合薄片 120A :底層薄片（第1薄片狀資材） 120B :不織布薄片（第2薄片狀資材） 120E, ' 1 2 0 E 2 :側咅 5 00 :延伸裝置 -23- 201117780 5 1 0 :加熱輥 5 2 0 :壓花輥機構 532、542 ：凸部 600 :擴寬輥機構 6 1 0 :第1擴寬輥機構 6 1 1 :第1上側按壓輥 6 1 2 :第1下側按壓輥 620 :第2擴寬輥機構 621 :第2上側按壓輥 622 :第2下側按壓輥S -22-201117780 20A: Underlayer film 20B: bottom layer non-woven fabric 20E: edge portion 2 1 : extension portion 2 1 A : central extension portion 2 1 B : end extension portion 2 1 L : thick portion 2 1 T : dense portion 22 : unextended portion 30 : absorber 3 0A : mixed powder 3 〇 B : covering member 40 : waist flap portion 40A : front flap portion 40B : rear flap portion 41 : locking portion 50 : side flap portion 51 (51A to 51D): strip body 60: side sheet 120: composite sheet 120A: bottom sheet (first sheet material) 120B: non-woven sheet (second sheet material) 120E, '1 2 0 E 2 : side咅5 00 : extension device -23- 201117780 5 1 0 : heating roller 5 2 0 : embossing roller mechanism 532, 542 : convex portion 600 : widening roller mechanism 6 1 0 : first widening roller mechanism 6 1 1 : First upper pressing roller 6 1 2 : first lower pressing roller 620 : second widening roller mechanism 621 : second upper pressing roller 622 : second lower pressing roller