1221410 (1) 玖、發明說明 【發明所屬之技術領域】 本發明係有關一種使用於生理用衛生棉或用後 紙尿褲等之吸收性物品的透液性表面薄片。 【先前技術】 在以往之生理用衛生棉或用後即棄型紙尿褲等 性物品中，已揭示了多種爲至少部份包覆含於該物 收性芯材之表面的透液性表面薄片。例如：在曰本 4-3 5 662號公報（專利文獻1)中所揭示之吸收性 表面薄片，其係由使熱可塑性合成纖維融著之不織 成，並且不織布的一部份係具有導液管，且該導液 有透氣性。物品內部即可透過該周壁，而藉由該表 的導液管得以透氣。此外，在特開平4 - 5 8 9 5 0號< 利文獻2)中所揭示的吸收性物品的表面薄片，係 可塑性纖維融著之不織布所形成，該不織布的一部 有導液管，並且在導液管的下面開口端係形成纖維 在該表面薄片的導液管，位於下面開口端的纖維羽 芯片接觸而發揮優異的毛細管作用，故可有效地將 行至芯片。而在特開昭64-64622號公報（專利文獻 揭示的透液性熱可塑性樹脂薄膜，係只有在薄膜的 具有終止於自由緣之呈突起狀的開口。該開口之最 面，其位在該薄膜之平滑側的平面係位在反對側的 ，並且開口的剖面係從最窄之剖面的位置朝該突起 即棄型 之吸收 品之吸 特開平 物品的 布所形 管係具 面薄片 >報（專 由使熱 份係具 羽毛。 毛係與 體液移 3)中所 單面， 窄的剖 平面上 之自由 -5- (2) (2)1221410 緣’在軸方向上逐漸增大。根據本文獻的話，即可得到即 使是針封粘性局於水份g午多的液體，仍具有優異透過性的 多孔性薄膜。在該多孔性薄膜，其開口在具有最窄剖面的 部位，其毛細管作用較大。 (專利文獻1)特開平4-3 5 662號公報 (專利文獻2 )特開平4 - 5 8 9 5 0號公報 (專利文獻3)特開昭64-6465 5號公報 [發明所欲解決之課題] 形成於專利文獻1之表面薄片的導液管，其從導液管 之上端部至下端部，係呈與垂直方向相同之傾斜延伸。並 且因爲該傾斜，而使管徑無論是朝下端部逐漸變窄，或變 寬，或無變化都爲相同。在專利文獻2中的導液管，其形 成纖維羽毛的部份係與導液管之延伸方向相同。在專利文 獻3中的導液管，其位於呈突起狀之開口的自由緣與其附 近，係朝向開口的外方，換言之，也就是朝向開口之徑變 大的方向延伸。於該等專利文獻1〜3中所揭示的表面薄 片或塑膠薄膜，若將之做爲生理用衛生棉的表面薄片來使 用的話，則當要丟棄生理用衛生棉時，就會透過導液管的 開口，直接看到通過該表面薄片而被芯材所吸收的經血。 如此一來，其與不易見到經血的衛生棉相比，於丟棄衛生 棉時就容易讓使用時產生不悅的感覺。 本發明之課題，即爲解決當丟棄衛生棉等之著用物品 時，不會讓使用者產生不悅感的問題。 -6 - (3) (3)1221410 【發明內容】 〔用以解決課題之手段〕 爲了解決上述課題，本發明的對象即爲一種體液吸收 性物品的透液性表面薄片，其係由熱可塑性塑膠薄膜所形 成，並具有肌膚抵接域、及利用上述抵接域而畫成周緣之 多數的透液性透孔；在上述透孔係形成有與位在從上述周 緣至上述抵接域之上述肌膚對向之上面，朝該上面之裏側 ，也就是下面的方向延伸的管狀部，並且該上述管狀部的 下端部份係與體液吸收性芯材接觸來使用。 本發明之上述透液性表面薄片，其特徵爲：上述管狀 部的下端部份，係在上述管狀部的周方向被不規則且複數 地細分化，且被細分化的上述下端部份，對於比其更爲上 方的部份而言，係呈彎曲且朝向上述管狀部之徑方向內方 延伸。 在本發明中，有以下幾種較佳實施形態。 (1 )上述透孔係具有：上方開口部、及徑比上述上 方開口部小的下方開口部，且上述下方開口部的徑係在 0.3〜2mm的範圍內。 (2 )被包夾在上述透孔與透孔間的上述抵接域的寬 度，係在0.1〜1 m m的範圍內。 (3 )從位於上述管狀部之上述抵接域的上面至上述 下端部部份的深度，係在0.1〜2mm的範圍內。 (4 )位於上述抵接部之上述塑膠薄膜的厚度，係在 0.02〜0.05mm的範圍內。 -7 - 1221410 (4) (5) 上述塑膠薄膜，係在1〇〇重量％中除了含有： 25〜40重量％的直鏈型低密度聚乙烯、及〇〜1〇重量％ 的低密度聚乙烯、及25〜40重量％的乙烯與α-烯烴的共 聚物、及20〜50重量％的硫酸鋇外’還含有適量重量％ 的著色劑、及親水化劑及滑劑，且其單位面積重量係爲 10 〜50g/m2 〇 【實施方式】 [發明之實施形態] 以生理用衛生棉來做爲體液吸收性物品爲例，茲參照 圖面詳細說明有關本發明之透液性表面薄片如下。 於第1圖中，以部份剖開立體圖所示的生理用衛生棉 1，係具有縱方向A及橫方向B，是爲一朝縱方向A所做 成的矩形物，且係由透液性表面薄片2、及不透液性背面 薄片3、及吸液性芯材4所構成。表面薄片2與背面薄片 3係從芯材4的周緣朝側方延伸重疊，並藉由溶著或黏著 而接合，而形成朝縱方向A延伸的一對的側緣部6、及朝 橫方向B延伸的一對端緣部7。 表面薄片2係由熱可塑性塑膠薄膜所形成，在被側緣 部6及端緣部7所包圍，且包覆芯材4之下面8的內側部 位9，係具有多數的透液性透孔22。 背面薄片3係由熱可塑性塑膠所形成之不透液性薄膜 所構成。該薄膜可使用如聚乙烯製品者。背面薄片3在其 下面1 2的所要部位係塗抹著粘著劑（無圖示），可在衛生 -8- (5)1221410 棉使用者的內褲上自由裝著。 芯材4係爲將由粉碎紙漿或粉碎紙漿與高吸收性聚 物粒子的混合物、或粉碎紙漿與高吸收性聚合物纖維之 合物，壓縮至所要的密度者，通常其全體均被吸水紙 所包覆。芯材4係藉由熱熔接著劑等的黏接劑，而可與 面薄片3及/或表面薄片2接合。 第2圖係表面薄片2的部份擴大立體圖。表面薄片 係呈平坦狀’具有：與衛生棉使用者之肌膚密接的肌膚 接域2 1、及因爲肌膚抵接域2 1而在周緣畫成的多數透 22。肌膚抵接域2 1係具有面對衛生棉使用者之肌膚的 面23、及上面23的背側，也就是下面24，該兩面23 24間的厚度t，最好是在〇.〇1〜〇.〇5mm的範圍內。位 相隣之透孔22與22之間的肌膚抵接域21的寬度w， 最好是在0.1〜1mm的範圍內。透孔22係具有：周緣 肌膚抵接域2 1而被畫成的上方開口部26、及從開口部 朝從肌膚抵接域21之上面23朝下面24之方向延伸的 狀部27、及被管狀部27之下端部份28所畫成的下方 口部29。上方開口部26的形狀爲不定形，除了如圖例 示的各自呈略圓形外，也可爲長圓形或多角形、或其他 意形狀的自由組合。管狀部27的內徑係從上方開口部 朝下方開口部29逐漸變小。管狀部27的下端部份28 在周方向被細分化成不規則且複數狀。該下端部份2 8 於位在管狀部，且較其更爲上方的部份而言係呈彎曲， 朝管狀部2 7的徑方向內方延伸。 合 混 14 背 2 抵 孔 上 於 則 因 26 管 開 所 任 26 則 對 並 -9 - (6) (6)1221410 第3圖係第2圖的III 一 III線剖面圖，第4圖係爲沿 著該剖面圖IV - IV線，從箭頭方向所看到的圖，且在第 3圖中係一倂顯示了芯材4的一部份。如這些圖所示般， 管狀部27的內徑係從肌膚抵接域21的上面朝下面24的 方向逐漸變小，而下端部份2 8則朝其上方的部份彎曲， 並朝管狀部27之徑方向內方而呈花瓣狀延伸。在含有該 管狀部27的透孔22，塑膠薄膜係自肌膚抵接域2 1朝管 狀部27呈畫弧狀延伸。並且在管狀部27，其塑膠薄膜的 厚度係從上方開口部26朝下方開口部29逐漸減少。形成 下方開口部29之周緣部份的下端部份28，在周方向係被 如朝向下方開口部29之大約徑方向延伸般形成的多數的 裂縫3 1分割、細分化成複數。位於該下端部份2 8之塑膠 薄膜的上面23，則如面對上方開口部26般朝向上方，而 下面24則在芯材4的吸水紙14從上方與之抵接。透孔 22因其下端部份28係朝徑方向內方延伸，所以下方開口 部29的開口面積有變小的傾向，但可利用裂縫3 1的存在 來控制該傾向。管狀部27對於藉由吸水紙1 4所示的水平 面L，以具有30〜80°，最好是40〜75°之幾乎一樣的傾 斜。在第4圖中，由與管狀部27之下端部份28內接的虛 線所示的下方開口部29的最大徑d，係在0.3〜2mm的範 圍內。最好的管狀部27，其從肌膚抵接域21的上面23 至下方開口部29的深度η，係在0.1〜2mm的範圍。 對於爲形成這種表面薄片2的塑膠薄膜，最好是使用 由具單位面積重量10〜50g/m2之聚烯烴系聚合物所構成者 -10- 1221410 (7) 。上述聚合物中係含有聚乙烯的均聚物或共聚物，及該等 均聚物或共聚物的混合物。最佳的塑膠薄膜，可爲除了在 100重量％的薄膜中含有25〜40重量％的直鏈型低密度 聚乙烯、0〜10重量％的低密度聚乙烯、25〜4〇重量％的 乙燦及丁燒、丙燒、甲基戊嫌、辛嫌等的^ 一嫌烴的共聚 物、20〜5 0重量％的硫酸鋇或碳酸鈣、滑石等之微粒子 材粒外’還含有適當重量％的氧化鈦等之著色劑或甘油之 脂肪酸酯等的親水劑、脂肪醯胺等滑材。在本例的薄膜中 ，乙烯與α -烯烴的共聚物可付予該薄膜彈性。硫酸鋇等 的微粒子在薄膜被拉伸時會浮出表面，故可消除薄膜表面 的色彩，並抑制該表面給予肌膚的黏濕感。而氧化鈦等的 著色劑則可隱蔽被芯材4所吸收的經血。並且藉由使用親 水劑，即可付予管狀部2 7的上面2 3親水性，並利用較強 的毛細管作用，將流入管狀部27的經血導向芯材4移動 〇 如此被形成的生理用衛生棉1，經吸收了經血後，若 從上方來看它的話，雖可在下方開口部2 9直視到通過管 狀部27而朝芯材4被吸收的經血，但在形成下方開口部 29與管狀部27之下端部份28之邊界的多數的裂縫31， 則因在裂縫31與裂縫3 1之間存在被著色的下端部份2 8 ，所以無法直視到經血，故不會引起注意。在使用利用氧 化鈦來形成乳白帶狀的塑膠薄膜時’在下方開口部29的 周圍，經血看起來會變成白色。像這樣的生理用衛生棉1 ，不須顯著減少管狀部27之下方開口部29的開口面積’ -11 - (8) (8)1221410 換言之，不須犧牲衛生棉1的吸收速度與吸收量，仍可讓 被芯材4所吸收的經血不易被直接看到。 第5圖係與顯示一實施樣態之第2圖相同。圖示例的 表面薄片2係與肌膚抵接部2 1的上面23相互平行，並具 有朝衛生棉1之縱方向A延伸的複數條肋片5 1。肋片5 1 最好是以頂部5 2不會刺激到肌膚般地，在頂部5 2形成適 度的圓。肋片5 1的高度係在肌膚接觸域21之厚度t的 〇 . 5〜2倍左右的範圍，相隣之肋片5 1彼此間的距離p則 在2〜8mm的範圍。像這種肋片51，在生理用衛生棉1 抵接到肌膚時，可防止肌膚接觸域2 1大面積地與肌膚密 貼，且因在肌膚接觸域2 1與肌膚之間形成可透氣的空隙 ，故可防止肌膚的悶熱。肋片5 1或者是與肌膚抵接的生 理用衛生棉1，當在以朝橫方向B被壓縮時，還可使發生 在表面薄片2的縐褶朝縱方向A延伸。並且藉由將發生 在表面薄片2的縐褶朝縱方向A延伸，即可抑制經血朝 橫方向B流動，所以生理用衛生棉1即成爲不易發生側漏 了。此外，在該表面薄片2，因與肌膚的接觸面積有減少 的傾向，所以不論是在生理用衛生棉1的縱方向A或橫 方向B，表面薄片2與肌膚的柔觸感變好，對肌膚而言， 表面薄片2的黏濕感也減少了。 第6圖也是與顯不一實施樣態之第5圖相同。在圖示 例的表面薄片2，肌膚抵接部21係利用局部地朝上方隆 起而形成了肋片51。該肋片51雖爲同於第5圖之作用者 ，但從上方被按壓時，則因爲比第5圖更易變形，故膚觸 -12- (9)1221410 感更爲柔軟。 [發明效果] 本發明之表面薄片係具有透液性的透孔，且在該透孔 ，管狀部的下端部份係周方向被細分化爲複數，並朝管狀 部的徑方向內方彎曲，所以通過管狀部而被芯材所吸收的 體液（譬如：經血），則只有在透孔之下方開口部可被直 視，而在下方開口部的外側，則被隱藏在管狀部的下端部 份，故不會引人注意。具有這種表面薄片的生理用衛生棉 等的體液吸收性物品，在丟棄時因可不必直視到體液的髒 污，故可減緩其不悅感。 【圖式簡單說明】 第1圖係生理用衛生棉的部份剖開立體圖。 第2圖係表面薄片的部份擴大立體圖。 第3圖係爲沿著第2圖之III 一 III線，從箭頭方向所 看到的圖。 第4圖係爲沿者第3圖之IV — IV線，從箭頭方向所 看到的圖。 第5圖係同於顯示一實施樣態之一例的第2圖。 第6圖係同於顯示一實施樣態之一例的第5圖。 [符號說明] 1 體液吸收性物品（生理用衛生棉） -13- (10)1221410 2 表面薄片 4 芯材 2 1 抵接域 22 透孔 23 上面 24 下面 26 上方開口部 27 管狀部 28 下端部份 29 下方開口部 d 徑 η 深度 t 厚度 w 寬度1221410 (1) 发明. Description of the invention [Technical field to which the invention belongs] The present invention relates to a liquid-permeable surface sheet for absorbent articles such as sanitary napkins or disposable diapers. [Prior art] In conventional sanitary napkins or disposable articles such as disposable diapers, a variety of liquid-permeable surface sheets have been disclosed which at least partially cover the surface of the recyclable core material. For example, the absorbent surface sheet disclosed in Japanese Patent Publication No. 4-3 5 662 (Patent Document 1) is made of a non-woven made of thermoplastic synthetic fibers, and a part of the non-woven fabric has a guide Liquid tube, and the liquid-conducting liquid is breathable. The inside of the article can pass through the peripheral wall, and the watch can be vented through the catheter. In addition, the surface sheet of the absorbent article disclosed in Japanese Patent Application Laid-Open No. 4-5 8 9 50 < 2) is formed of a non-woven fabric fused with plastic fibers, and a part of the non-woven fabric has a catheter. In addition, a catheter having fibers formed on the surface sheet is formed at the lower open end of the catheter, and the fiber plume chip located at the lower open end contacts and exerts an excellent capillary action, so it can be efficiently run to the chip. In Japanese Patent Application Laid-Open No. Sho 64-64622 (Patent Document), the liquid-permeable thermoplastic resin film has a protrusion-shaped opening that terminates at a free edge only. The uppermost face of the opening is located in the The plane of the smooth side of the film is located on the opposite side, and the open cross-section is from the position of the narrowest cross-section toward the cloth-shaped pipe of the absorbent flat article of the protruding disposable absorbent article.> It is reported that the thermal element is feathered. The hair on the single side of the hair system and body fluid transfer 3), the freedom on the narrow cross-section plane -5- (2) (2) 1221410 The edge gradually increases in the axial direction. According to this document, it is possible to obtain a porous film having excellent permeability even with a pin-sealed liquid having a viscosity of more than g of water. In this porous film, the opening is at the site with the narrowest cross section, and The capillary action is large. (Patent Document 1) JP 4-3 5 662 (Patent Document 2) JP 4-5 8 9 50 (Patent Document 3) JP 64-6465 5 [ Problem to be Solved by the Invention] The surface sheet formed in Patent Document 1 The liquid tube extends obliquely from the upper end to the lower end of the catheter in the same direction as the vertical direction. Because of the inclination, the diameter of the tube gradually narrows, or widens, or remains unchanged. All of them are the same. In the catheter of Patent Document 2, the portion forming the fiber feather is the same as the extension direction of the catheter. The catheter in Patent Document 3 is free to be located in the protruding opening. The edge and its vicinity are toward the outside of the opening, in other words, extending toward the direction where the diameter of the opening becomes larger. The surface sheet or plastic film disclosed in these patent documents 1 to 3 is used for physiological purposes If the surface sheet of the sanitary napkin is used, when the sanitary napkin is to be discarded, the menstrual blood absorbed by the core material through the surface sheet will be directly seen through the opening of the catheter. Compared with sanitary napkins that are hard to see menstrual blood, it is easy to cause unpleasant feeling when using the sanitary napkins when discarding them. The problem of the present invention is to solve the problem of disposing of sanitary napkins and other articles without using them. The problem of discomfort. -6-(3) (3) 1221410 [Summary of the Invention] [Means to Solve the Problem] In order to solve the above problems, the object of the present invention is a liquid-permeable surface of a body fluid absorbent article. The sheet is formed of a thermoplastic plastic film, and has a skin abutment domain and a plurality of liquid-permeable through-holes drawn on the periphery by using the abutment domains; A tubular portion extending from the periphery to the abutment region facing the upper surface, extending toward the inner side of the upper surface, that is, the lower direction, and the lower end portion of the tubular portion is used in contact with a bodily fluid-absorbent core material. The liquid-permeable surface sheet of the present invention is characterized in that the lower end portion of the tubular portion is irregularly and plurally subdivided in a circumferential direction of the tubular portion, and the subdivided lower end portion is The portion above it is curved and extends inward in the radial direction of the tubular portion. In the present invention, there are the following preferred embodiments. (1) The through-hole system includes an upper opening portion and a lower opening portion having a smaller diameter than the upper opening portion, and the diameter of the lower opening portion ranges from 0.3 to 2 mm. (2) The width of the abutment domain sandwiched between the through holes and the through holes is in the range of 0.1 to 1 mm. (3) The depth from the upper surface of the abutment region located on the tubular portion to the lower end portion is in the range of 0.1 to 2 mm. (4) The thickness of the plastic film located in the abutting portion is in a range of 0.02 to 0.05 mm. -7-1221410 (4) (5) The above plastic film contains, in addition to 100% by weight, 25 to 40% by weight of a linear low-density polyethylene, and 0 to 10% by weight of a low-density polymer. In addition to ethylene, 25 to 40% by weight of a copolymer of ethylene and an α-olefin, and 20 to 50% by weight of barium sulfate, it also contains an appropriate amount of a coloring agent, a hydrophilizing agent, and a lubricant, and its unit area The weight is 10 to 50 g / m2. [Embodiment] [Embodiments of the invention] Taking a sanitary napkin as a body fluid absorbent article as an example, the liquid-permeable surface sheet of the present invention will be described in detail with reference to the drawings as follows . In Fig. 1, the sanitary napkin 1 shown in a partially cutaway perspective view has a longitudinal direction A and a transverse direction B. It is a rectangular object made in the longitudinal direction A and is made of liquid permeation. The surface sheet 2 and the liquid-impermeable back sheet 3 and the liquid-absorbent core material 4 are comprised. The top sheet 2 and the back sheet 3 extend sideways from the peripheral edge of the core material 4 and are joined by fusion or adhesion to form a pair of side edge portions 6 extending in the longitudinal direction A, and in a lateral direction. B extends a pair of end edge portions 7. The surface sheet 2 is formed of a thermoplastic plastic film, and is surrounded by the side edge portion 6 and the end edge portion 7 and covers the inner portion 9 of the lower surface 8 of the core material 4 with a large number of liquid-permeable through-holes 22 . The back sheet 3 is composed of a liquid-impermeable film made of a thermoplastic plastic. The film can be made of, for example, polyethylene. The back sheet 3 is coated with an adhesive (not shown) on a desired portion of the lower surface 12 and can be freely mounted on the underwear of a sanitary -8- (5) 1221410 cotton user. The core material 4 is a material obtained by compressing a crushed pulp or a mixture of crushed pulp and superabsorbent polymer particles, or a combination of crushed pulp and superabsorbent polymer fibers to a desired density, and generally all of them are covered by absorbent paper Wrapped. The core material 4 is bonded to the top sheet 3 and / or the top sheet 2 by an adhesive such as a hot-melt adhesive. FIG. 2 is an enlarged perspective view of a part of the surface sheet 2. The surface sheet is flat and has a skin contact area 2 1 in close contact with the skin of the user of the sanitary napkin, and a plurality of transparent areas 22 drawn on the periphery because the skin abuts the area 21. The skin abutment region 21 has a surface 23 facing the skin of the user of the sanitary napkin, and a back side of the upper surface 23, that is, the lower surface 24. The thickness t between the two surfaces 23 and 24 is preferably 0.001 ~ Within a range of 0.05 mm. The width w of the skin abutment domain 21 between the adjacent through holes 22 and 22 is preferably in the range of 0.1 to 1 mm. The through hole 22 includes an upper opening portion 26 drawn around the skin abutment area 21, a shape portion 27 extending from the opening portion toward the lower surface 24 from the upper surface 23 of the skin abutment area 21, and The lower mouth portion 29 is drawn as the lower end portion 28 of the tubular portion 27. The shape of the upper openings 26 is irregular. In addition to being slightly circular as shown in the figure, the upper openings 26 may also be free-form combinations of oblong or polygonal shapes or other shapes. The inner diameter of the tubular portion 27 gradually decreases from the upper opening portion to the lower opening portion 29. The lower end portion 28 of the tubular portion 27 is divided into irregular and plural shapes in the circumferential direction. The lower end portion 2 8 is located in the tubular portion, and is curved more than the upper portion, and extends inward in the radial direction of the tubular portion 27. Mix 14 back 2 hit the hole Yu then because of 26 pipe opening 26 task -9-(6) (6) 1221410 Figure 3 is a sectional view taken along line III-III in Figure 2 and Figure 4 is along the It is the figure seen from the arrow direction along the IV-IV line of this sectional view, and a part of the core material 4 is shown in a row in FIG. 3. As shown in these figures, the inner diameter of the tubular portion 27 gradually decreases from the upper surface of the skin abutment domain 21 to the lower surface 24, while the lower end portion 28 is bent toward the upper portion and toward the tubular portion. The diameter of 27 extends inward in a petal shape. In the through hole 22 containing the tubular portion 27, a plastic film extends from the skin contacting area 21 toward the tubular portion 27 in an arc shape. In the tubular portion 27, the thickness of the plastic film gradually decreases from the upper opening portion 26 to the lower opening portion 29. The lower end portion 28 forming the peripheral edge portion of the lower opening portion 29 is divided in a circumferential direction by a large number of cracks 31 that are formed as extending in the radial direction of the lower opening portion 29 and are divided into a plurality. The upper surface 23 of the plastic film at the lower end portion 28 faces upward as it faces the upper opening portion 26, and the lower surface 24 abuts on the absorbent paper 14 of the core material 4 from above. Since the lower end portion 28 of the through hole 22 extends inward in the radial direction, the opening area of the lower opening portion 29 tends to become smaller. However, the existence of the crack 31 can control this tendency. The tubular portion 27 has almost the same inclination with respect to the horizontal plane L shown by the absorbent paper 14 as 30 to 80 °, preferably 40 to 75 °. In Fig. 4, the maximum diameter d of the lower opening portion 29 indicated by the dashed line inscribed in the lower end portion 28 of the tubular portion 27 is in the range of 0.3 to 2 mm. The best tubular portion 27 has a depth η from the upper surface 23 of the skin abutment region 21 to the lower opening portion 29 in the range of 0.1 to 2 mm. For the plastic film for forming such a surface sheet 2, it is preferable to use a polyolefin-based polymer having a weight per unit area of 10 to 50 g / m2 -10- 1221410 (7). The above polymers are homopolymers or copolymers containing polyethylene, and mixtures of these homopolymers or copolymers. The most suitable plastic film can be a linear low-density polyethylene containing 25 to 40% by weight, a low-density polyethylene of 0 to 10% by weight, and a range of 25 to 40% by weight in 100% by weight of the film. Can and sintered, sintered, methylpentan, and acrid, etc. ^ a hydrocarbon copolymer, 20 to 50% by weight of barium sulfate or calcium carbonate, talc, and other particulate materials, and also contains an appropriate weight Coloring agents such as titanium oxide, hydrophilic agents such as fatty acid esters of glycerol, and sliding materials such as fatty ammonium. In the film of this example, a copolymer of ethylene and an? -Olefin can impart elasticity to the film. Fine particles such as barium sulfate will float to the surface when the film is stretched, so the color on the surface of the film can be eliminated, and the sticky feeling given to the skin by the surface can be suppressed. A coloring agent such as titanium oxide can conceal menstrual blood absorbed by the core material 4. In addition, by using a hydrophilic agent, the upper surface 23 of the tubular portion 27 can be rendered hydrophilic, and the strong capillary action can be used to move the menstrual blood flowing into the tubular portion 27 to the core material 4. The thus formed physiological hygiene Cotton 1 absorbs menstrual blood, and if viewed from above, the menstrual blood absorbed to the core material 4 through the tubular portion 27 can be seen directly in the lower opening portion 29, but the lower opening portion 29 and the tubular portion are formed. The majority of the cracks 31 on the border of the lower end portion 28 of the portion 27, because there is a colored lower end portion 2 8 between the crack 31 and the crack 31, so the menstrual blood cannot be seen directly, so it will not attract attention. When a plastic film formed of a milky white band using titanium oxide is used ', the menstrual blood looks white around the lower opening 29. Such a sanitary napkin 1 does not need to significantly reduce the opening area of the opening portion 29 below the tubular portion 27 '-11-(8) (8) 1221410 In other words, it is not necessary to sacrifice the absorption speed and amount of the sanitary napkin 1, The menstrual blood absorbed by the core material 4 can still not be easily seen directly. Fig. 5 is the same as Fig. 2 showing an embodiment. The surface sheet 2 illustrated in the figure is parallel to the upper surface 23 of the skin contacting portion 21, and has a plurality of ribs 51 extending in the longitudinal direction A of the sanitary napkin 1. The fins 5 1 preferably form a moderate circle on the top 5 2 so that the top 5 2 does not irritate the skin. The height of the fins 51 is in the range of 0.5 to 2 times the thickness t of the skin contact area 21, and the distance p between adjacent fins 51 is in the range of 2 to 8 mm. Such a rib 51 can prevent the skin contact area 21 from being closely adhered to the skin when the sanitary napkin 1 abuts on the skin, and a breathable gas is formed between the skin contact area 21 and the skin. The gaps can prevent the skin from being stuffy. When the ribs 51 or the sanitary napkin 1 in contact with the skin are compressed in the lateral direction B, the creases occurring on the surface sheet 2 can be extended in the longitudinal direction A. Furthermore, by extending the creases occurring on the surface sheet 2 in the longitudinal direction A, the menstrual blood can be prevented from flowing in the lateral direction B. Therefore, the sanitary napkin 1 becomes less prone to side leakage. In addition, the surface sheet 2 tends to have a reduced contact area with the skin. Therefore, whether in the longitudinal direction A or the horizontal direction B of the sanitary napkin 1, the soft touch between the surface sheet 2 and the skin is improved. As for the skin, the stickiness of the surface sheet 2 is also reduced. Fig. 6 is also the same as Fig. 5 showing the embodiment. In the surface sheet 2 of the illustrated example, the skin contacting portion 21 is formed by partially bulging upward to form a rib 51. Although the rib 51 is the same as that in FIG. 5, when pressed from above, it is more easily deformed than in FIG. 5, so the skin feels softer. [Effects of the Invention] The surface sheet of the present invention has liquid-permeable through-holes, and in the through-holes, the lower end portion of the tubular portion is subdivided into a plurality of circumferential directions, and is bent inward in the radial direction of the tubular portion. Therefore, the body fluid (such as menstrual blood) absorbed by the core material through the tubular portion can be directly viewed only through the opening below the through hole, and the outer portion of the lower opening is hidden in the lower end portion of the tubular portion. It won't be noticeable. Body fluid absorbent articles such as sanitary napkins having such a surface sheet do not need to look directly at the soil of the body fluid when discarded, so that the discomfort can be reduced. [Schematic description] Figure 1 is a partially cutaway perspective view of a sanitary napkin. Figure 2 is an enlarged perspective view of a portion of the surface sheet. Figure 3 is a view seen from the direction of the arrow along the line III-III of Figure 2. Figure 4 is a view taken along the line IV-IV of Figure 3 as viewed from the direction of the arrow. Fig. 5 is the same as Fig. 2 showing an example of an embodiment. Fig. 6 is the same as Fig. 5 showing an example of an embodiment. [Description of Symbols] 1 Body fluid absorbent article (sanitary napkin) -13- (10) 1221410 2 Surface sheet 4 Core material 2 1 Contact area 22 Through hole 23 Upper surface 24 Lower surface 26 Upper opening 27 Tube portion 28 Lower end Part 29 bottom opening d diameter η depth t thickness w width
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