1309170 ⑴ 九、發明說明 【發明所屬之技術領域】 本發明，係關於用後即棄型口罩，更詳之，是關於含 有駐極體纖維層的用後即棄型口罩及其製造方法。 【先前技術】 以往，針對於裝著在裝著者顏面的口罩，已知有由駐 極體纖維層構成口罩本體之一部分或全部者。例如，專利 文獻1，揭示有其爲由內材以及覆蓋此內材的外材所構成 ，並兼具低壓力損失及高捕集性之口罩；上述內材，爲由 駐極體熔噴不織布所構成，上述外材，爲由嫘縈短纖維不 織布所構成。 專利文獻2，揭示有由外層及中間層以及內層所構成 之口罩；上述外層爲由紡黏/熔噴/紡黏之不織布所構成， 上述中間層爲由駐極體熔噴材料所構成，上述內層爲由上 述不織布所構成。 〔專利文獻1〕 日本特開昭6 1 - 2 7 2 0 6 3號公報 〔專利文獻2〕 日本特表200卜516237號公報 【發明內容】 〔發明所欲解決之技術問題〕 於專利文獻1，關於內材與外材之接合形態並無言及 。又，於專利文獻2，亦僅揭示各層之全部或是一部分只 要與鄰接層結合即可，關於該結合形態並無具體言及。 -5- (2) 1309170 然而，由複數層構成口罩之場合，該當 般’例如，將各層藉由熱熔接著劑之塗佈加 並予以積層。 但是，駐極體性能，於高溫（約1 3(TC 因熱所引起之電荷的洩漏而衰減，此爲周知 ’若爲了接合複數層駐極體纖維層而對該層 劑之塗佈加工，則上述性能會受到損害。 φ 又，於專利文獻2，由於其內外層爲由 構成，一般，因該不織布在構成此內外層之 之接合強度會比較低，或存在有未接合部， 有所謂起毛之問題。 本發明，由於爲藉由夾介熱熔接著劑將 維層之複數片纖維層予以接合，而製得用後 體者，故以實現不因熱熔接著劑損害太多駐 並具備有保形性、低起毛、低壓力損失以及 φ 能之口罩本體及其製造方法爲目的。 〔解決問題之技術手段〕 根據本發明，用以達成上述目的之用後 其覆蓋裝著者的鼻及口之口罩本體，爲包含 片所形成之內外層，以及由駐極體纖維薄片 述內外層成爲一體地介於上述內外層間之中 作爲本發明特徵之一的構成形態，爲於 上述內外層與上述中間層的各接合面是夾介 業者爲如周知 工接合成一體 以上）之下會 之事實。因此 施以熱熔接著 防黏不織布所 纖維的交織點 故若摩擦則易 含有駐極體纖 即棄型口罩本 極體之性能， 高捕集性等性 即棄型口罩， 分別由纖維薄 所形成且與上 間層。 上述口罩，其 斷續地介於該 -6 - (3) 1309170 各接合面之熱熔接著劑而接合，其上述中間層之相對於上 述內外層的上述各接合面之上述熱熔接著劑的附著量，爲 比上述內外層之相對於上述中間層的上述各接合面之上述 熱熔接著劑的附著量還少。 作爲本發明特徵之另一構成形態，爲於上述口罩之製 造方法，在分別於上述內外層之各一面斷續地塗佈熱熔接 著劑後’使分別塗佈有上述熱熔接著劑之上述內外層各面 φ 重疊於各別之上述中間層的面，將上述各層夾介上述熱熔 接著劑接合成一體。 形成上述中間層之上述駐極體纖維薄片，以熔噴不織 布爲理想，而形成上述內外層之上述纖維薄片，以點黏不 織布爲理想。若爲此構成形態，則由上述內外層所構成之 口罩本體的保形性較優，並可抑制因磨擦造成之起毛，降 低壓力損失，可捕集粒子較粗之粉塵，並且，於上述中間 層可捕集粒子比較微小之粉塵。 # 上述中間層之纖維密度，爲比上述內外層各別之纖維 密度還高（a )，上述內外層各別之基重，爲比上述中間 層之基重還大（b〉，形成上述內外層之上述纖維薄片的 纖維徑，爲比形成上述中間層之上述駐極體纖維薄片的纖 維徑還大（c )，以及上述熱熔接著劑之塗佈量，於上述 內層與上述中間層之接合面、上述中間層與上述外層之接 合面，分別爲0.5〜2.5g/m2 ( d )，亦即，以此等（a )〜 (d )之至少一個或該等複數之組合爲理想。特別是，根 據有關此構成，可降低粉塵所引起之口罩本體的壓力損失 (4) 1309170 ，且藉由該等構成可使捕集效率再提升。 ' 相對於上述點黏不織布之全區域的點黏之面積率爲1 5 〜25%，且，該各個點黏之面積爲0.2〜2mm2，此可提昇 口罩本體之保形性，抑制起毛，故爲理想。 於本發明，所謂「點黏不織布」，是指於纖維織網之 全方向施以間隔開一定距離之點狀的加壓加熱處理，使該 織網之構成纖維產生點狀熔著，且，於加熱下使該纖維之 > 交織點熔著之意。 上述熱熔接著劑之上述斷續塗佈，以纖維狀噴霧來塗 佈爲理想。若爲此構成形態，則上述斷續塗佈可很容易地 實施。 上述熱熔接著劑之塗佈時的溫度，爲1 10〜145 °C，此 可不使上述中間層之駐極體效果降低，故爲理想。 〔發明之效果〕 根據有關本發明之用後即棄型口罩，可提供一種即使 將上述內外層及上述中間層夾介熱熔接著劑予以接合，亦 不太會損害上述中間層之駐極體性能或效果，於保形性很 優異，可抑制起毛’並且’具備有低壓力損失及高捕集性 之性能的用後即棄型口罩。 根據有關本發明之用後即棄型口罩的製造方法，使上 述效果確實奏效之該製造方法可很容易地實現。 【實施方式】 -8 - (5) 1309170 將有關本發明之用後即棄型口罩的實施形態，參照圖 * 示例，說明如下。 參照第1圖，可知用後即棄型口罩10，爲由覆蓋裝著 者之鼻及口的口罩本體11’以及套掛於裝著者耳朵以保持 口罩本體11之裝著狀態的一對掛耳部12、12所構成。口 罩本體1 1 ’爲由實質上具備有彈性非伸長性之形狀大小皆 相同的熱可塑性薄片構件1 3、1 4，以其周緣合貼於裝著者 0 之顏面’且，與裝著者的鼻及口之間產生適當間隔之形態 來形成。不過，口罩本體1 1 ’若要得以確保所需之保形性 ，亦可多少具備有彈性伸長性。薄片構件1 3、1 4，爲沿著 朝向該等二者前方凸狀彎曲之前端緣15藉由熱密封而接 合一起。掛耳部1 2 ’爲由具備有彈性伸長性之形狀大小皆 相同的熱可塑性薄片構件1 6、1 7所形成。薄片構件1 6、 17，爲於該等薄片構件之前端部附近，具備有通過裝著者 耳朵之開口 18、19，於該等薄片構件之基端緣20、21， φ 藉由熱密封接合有薄片構件13、14之後端緣22、23。 參照第2圖（A )及（B )，可知由薄片構件1 3、1 4 所形成的口罩本體11，爲包含有於口罩之裝著時位於裝著 者肌膚擋接面的內層24,以及位於裝著者之非肌膚擋接面 的外層25，以及與上述內外層成爲一體地介於內外層24 、2 5間之中間層2 6。 中間層.26，爲由駐極體纖維薄片所形成。該駐極體纖 維薄片，爲基重15〜30g/m2，表觀密度0.08〜0.13g/cm3 ，纖維徑〇_5〜4.0// m，特別是纖維徑爲1.0〜2.50# m之 -9 - (6) 1309170 熔噴不織布者，其不但可持續維持所需之低壓力損失並可 獲得高捕集效率，且特別是其與粉塵之接觸面積較大，故 爲理想。作爲不織布材料之適當者，爲聚烯烴系、聚酯系 、聚醯胺系等之熱可塑性合成纖維。 駐極體纖維薄片，爲將纖維薄片或是不織布之纖維予 以駐極體化而製得，並於纖維表面具備有所需量之正電荷 或是負電荷者。該駐極體化，可採用習知之方法，例如， 揭示於專利文獻1及2之方法。 又，中間層2 6，依據其表觀密度、構成纖維徑之情形 ，爲了適當控制壓力損失及捕集效率，除了纖維間隙之外 ，亦可形成多數之微細孔。 內外層24、25，爲基重20〜5 Og/m2，表觀密度〇.〇9 〜〇.12g/cm3，纖維徑10〜40/zm之點黏不織布者，其可 獲得所需之保形性及起毛抑制，以及所需之低壓力損失及 高捕集效率，故爲理想。在此所謂「點黏不織布」，爲先 前已定義者。相對於該點黏不織布之全區域的點黏之面積 率爲15〜25%，且，該點黏之各個面積爲0.2〜2mm2者， 其可持續維持低壓力損失及高捕集效率，提昇口罩本體11 之保形性，並抑制起毛，故爲理想。若上述面積率未滿 1 5 %，且，上述各個點黏之面積未滿0.2 m m 2時，則不能獲 得所需之上述保形性及起毛抑制。若上述面積率超過2 5 % ，且，上述各個點黏之面積超過2mm2，則口罩本體11之 剛性會變得太高而破壞了口罩裝著感，致使壓力損失變高 而捕集效率降低。 -10- (7) 1309170 如前述般，藉由內外層24、25之基重比中間層26 大，且，內外層24、25之表觀密度比中間層26還低， 別可在外層25處捕集粒子較大的粉塵，使粒子較小的 塵通過外層25，而儘可能在中間層26處予以捕集，並 ，可使裝著者透過內層24之呼吸變得較容易。 再者，由於中間層2 6，由熔噴不織布所形成，纖維 合力較低，爲易於與其他物體滑動接觸而產生起毛者， 以內外層24、25能有效防護有關此中間層26的表面， 提昇口罩本體1 1整體之物理性/機械性的強度，亦即， 昇口罩本體11之內外表面強度、口罩本體11整體之保 性等爲理想。其爲內外層24、25之不織布材料的合成 脂，不必一定要與中間層相同。 內外層24、25及中間層26，其內外層24、25與中 層26之各接合面，亦即，接合面24a與接合面26a、接 面26b與接合面24，爲夾介斷續地介於該等接合面之 熔接著劑27而接合。於圖雖沒有明示，不過中間層26 相對於內外層24、25的各接合面26a、26b之熱熔接著 27的附著量’設定得比內外層24、25之相對於中間層 的各接合面24a、25a之熱熔接著劑27的附著量還少。 此’可儘可能減少藉由相對於中間層26之駐極體纖維 _熔接著劑27之塗佈時產生的熱所造成之影響，並且 可儘可能減少中間層2 6的網目阻塞，而抑制壓力損失。 內外及中間層24、25、26，特別是於直接擋接在裝 者肌膚的內層24 ’以使其含有化妝容許可能範圍內且具 還 特 粉 且 結 故 並 提 形 樹 間 合 熱 之 劑 26 因 的 著 備 -11 - (8) 1309170 有抗菌或消臭效果的藥劑或化學劑，例如環糊精，較爲理 • 想。又’作爲熱熔接著劑27者，以化妝容許可能範圍內 且低臭味之合成橡膠系者爲理想。 具備有前述構成之口罩本體11，可藉由後述之方法製 得。 要作爲內外層24、25而預先形成之第1及第2纖維 織網（點黏不織布織網）的，相對於要作爲中間層26而 φ 預先形成之第3纖維織網（熔噴不織布織網）之接合面， 亦即，相對於接合面24 a、2 5 a，藉由將熱熔接著劑2 7利 用空氣強吹之習知之所謂簾式淋塗機，以使該接著劑之塗 佈量成爲0.5〜2.5g/m2，較佳爲0.8〜1 _5g/m2之方式，纖 維狀地，亦即，斷續地分別塗佈於接合面24a、25a。 於該塗佈，熱熔接著劑2 7之溫度，以上述第1及第2 纖維織網（內外層24、25 )之構成纖維不會熔融的溫度及 /或對於上述第3纖維織網（中間層26 )之駐極體纖維沒 Φ 有影響或是影響很少的溫度，亦即，溶解溫度11 〇〜1 451 ，較爲理想。不過，該溫度，由相對於上述第1及第2纖 維織網的熱熔接著劑2 7之塗佈裝置噴射出之時間’可藉 由從該噴射時間點直至將上述第1及第2纖維織網接合於 第3纖維織網的時間點之時間，予以適當控制’而溫度爲 1 2 0〜1 4 0 °C者，在將該控制納入考慮時也更爲理想。熱熔 接著劑27之塗佈量若未滿上述0.5 g/m2，則會有內外層24 、25與中間層26之層間剝離之虞，若超過上述2.5g/m2’ 則不能確保低壓力損失及高捕集性。 -12- (9) 1309170 ' 其次，藉由上述第1及第2纖維織網的接合面24a、 • 25a以分別與上述第3纖維織網之接合面26a、20b相向之 方式，使前者之纖維織網在適當加壓下重疊於後者之纖維 織網，並夾介熱熔接著劑27將第1、第2及第3纖維織網 予以接合而形成積層纖維織網。然後，將該積層纖維織網 裁切成口罩本體11之上述薄片構件13、14的形狀，並藉 由將此等薄片構件在上述前端緣15處予以熱密封，而製 φ 得口罩本體1 1。 口罩本體11，由於在將熱熔接著劑27藉由以空氣勁 吹之習知之所謂簾式淋塗機以纖維狀塗佈於上述第1及第 2纖維織網之接合面24a、25a後，將該等接合面 24a、 25a分別接合於上述第3纖維織網之接合面26a、26b，再 加上，第1及第2纖維織網之纖維密度比第3纖維織網之 纖維密度還低’故其上述第3纖維織網之相對於上述第i 及第2纖維織網的各接合面26a、26b之熱熔接著劑27的 % 附著量，會比上述第1及第2纖維織網之相對於上述第3 纖維織網的各接合面24a、25a之熱熔接著劑27的附著量 還少。 又，如前述，特別於其爲內層24之上述第1纖維織 網’使其含有發揮上述抗菌或消臭效果之環糊精，又，作 爲熱熔接著劑者’則使用上述橡膠系者。 <實施例> 分別製造了由基重爲20g/m2，表觀密度爲〇 llg/cm3 -13- (10) 1309170 ，纖維徑爲2.5vm之聚丙烯纖維所組成並施以駐極體加 工的熔噴不織布，以及由基重爲 30g/m2，表觀密度爲 0.09 g/cm3，纖維徑爲26 之芯爲聚丙烯，而鞘爲聚乙 烯之複合纖維（株式會社chisso製「ESC」）所構成的點 黏不織布。將熱熔接著劑（商品名「ever grip」「FM 165 」）以1 g/m2使用簾式噴霧之方式塗佈於點黏不織布之單 面。藉由在該塗佈後1分鐘以內，以將該塗佈面重疊於熔 噴不織布的兩面之方式，將熔噴不織布用點黏不織布在適 當加壓下夾住，將此等不織布接合，而製得了樣本。 <比較例1 > 除了將上述熱熔接著劑塗佈於熔噴不織布的兩面之外 ，以與實施例相同之條件製得樣本。 <比較例2 > • 由基重爲20g/m2，表觀密度爲0.1 lg/cm3，纖維徑爲 2.5^m之聚丙烯纖維所組成並施以駐極體加工的熔噴不織 布，於該不織布之單面積層以由基重爲3 Og/m2，表觀密度 爲0.〇9g/cm3，纖維徑爲26 μ m的聚丙烯纖維所構成之紡 黏不織布，並於該不織布之另一單面積層以與上述紡黏不 織布相同的紡黏不織布。於上述積層之際，於熔噴不織布 之各單面’將聚乙烯樹脂塗佈成厚度爲3/zm，寬幅爲 1mm，間隔爲3mm的直紋狀（條狀），夾介該樹脂將上述 不織布之各層接合。 _ 14 - (11) 1309170 <實驗例> 通氣度（壓力損失）及捕集效率之測量，爲依據「 JIS Τ 81δ1防塵口罩」而測量了上述各樣本。 於測量裝置，是使用了 「柴田科學製造之口罩 MASKTESTER AP-63 1 0FP 型」。 又’直至起毛爲止之摩擦次數的測量，爲依據「JIS l φ 0 8 4 9 F耐摩擦堅牢度測試」，對樣本施以5 0 0 g荷重，測 量了從第幾次開始產生起毛。 實驗結果，如後述之表所示。 〔第1表〕 通氣度（cc/cm2/sec) 捕集效率（〇/〇) 直至起毛爲止之摩擦次數 實施例 63 90 30 比較例1 60 82 30 比較例2 28.4 91.1 1 【圖式簡單說明】 第1圖是有關本發明之用後即棄型口罩的立體圖。 第2圖’ （A)是沿著第1圖之11_11線的放大斷面模 式圖。（B)是其分離圖。 【主要元件符號說明】 1 1 : 口罩本體 24 :內層 15- (12)1309170 25 ： 26 ： 24a : 25a ： 2 6a、 2 7 ·_ 外層 中間層 內層之接合面 外層之接合面 2 6 b :中間層之接合面 熱熔接著劑1309170 (1) Description of the Invention [Technical Field] The present invention relates to a disposable mask, and more particularly to a disposable mask containing an electret fiber layer and a method of manufacturing the same. [Prior Art] Conventionally, it has been known that a part or all of the mask body is constituted by the electret fiber layer for the mask to be attached to the face of the wearer. For example, Patent Document 1 discloses a mask which is composed of an inner material and an outer material covering the inner material and which has both low pressure loss and high trapping property; the inner material is made of an electret melt-blown nonwoven fabric. In the above configuration, the outer material is composed of a short fiber non-woven fabric. Patent Document 2 discloses a mask composed of an outer layer, an intermediate layer, and an inner layer; the outer layer is composed of a spunbond/meltblown/spunbond nonwoven fabric, and the intermediate layer is composed of an electret meltblown material. The inner layer is composed of the above non-woven fabric. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. There is no mention of the joint form of the inner and outer materials. Further, in Patent Document 2, only all or a part of each layer is only required to be bonded to an adjacent layer, and the combination form is not specifically described. -5- (2) 1309170 However, in the case where the mask is composed of a plurality of layers, it is conventional to laminate the layers by, for example, application of a hot-melt adhesive. However, the electret performance is at a high temperature (about 13 (TC attenuates due to leakage of charge caused by heat, which is well known). If the layer is coated in order to bond a plurality of layers of electret fibers, The above-mentioned performance is impaired. φ Further, in Patent Document 2, since the inner and outer layers are formed, generally, the non-woven fabric has a low joint strength for forming the inner and outer layers, or there is an unjoined portion. The problem of raising hair. In the present invention, since a plurality of fiber layers of the layer are joined by interposing a heat-fusible bonding agent, a post-body is obtained, so that no damage is caused by the hot-melt adhesive. The invention relates to a mask body having shape retention, low raising, low pressure loss and φ energy, and a method for manufacturing the same. [Technical means for solving the problem] According to the present invention, the nose of the wearer is covered after use for achieving the above purpose The mask body of the mouth is a configuration form in which the inner and outer layers formed by the sheet and the inner and outer layers of the electret fiber sheet are integrally interposed between the inner and outer layers as one of the features of the present invention. The fact that the joint faces of the inner and outer layers and the intermediate layer are formed by a sandwich manufacturer is integrated as described above. Therefore, the interlacing point of the fibers of the heat-fusible and anti-adhesive nonwoven fabric is applied. It is easy to contain the properties of the electret fiber-disposing mask. The high-capacity and other disposable masks are made of thin fibers and are connected to the upper layer. The masks are intermittently interposed. 6 - (3) 1309170 joining the hot-melt adhesives of the joint faces, wherein the amount of adhesion of the hot-melt adhesive to the joint faces of the inner and outer layers with respect to the inner and outer layers is larger than that of the inner and outer layers In the above-mentioned intermediate layer, the amount of adhesion of the hot-melt adhesive to each of the joint faces is small. As another aspect of the present invention, in the method of manufacturing the mask, each of the inner and outer layers is intermittently After applying the hot melt adhesive, the surface of each of the inner and outer layers φ coated with the hot-melt adhesive is superposed on the surface of each of the intermediate layers, and the respective layers are bonded to the hot-melt adhesive. The above-mentioned electret fiber sheet forming the intermediate layer is preferably a melt-blown nonwoven fabric, and the fiber sheet of the inner and outer layers is preferably formed of a non-woven fabric. If the form is formed, the inner and outer layers are The mask body is formed to have better shape retention property, can suppress fuzzing caused by friction, reduce pressure loss, and can collect coarse dust particles, and can collect fine particles of dust in the intermediate layer. The fiber density of the intermediate layer is higher than the density of the fibers of the inner and outer layers (a), and the basis weight of the inner and outer layers is larger than the basis weight of the intermediate layer (b>, forming the inner and outer layers The fiber diameter of the fiber sheet is larger than the fiber diameter of the electret fiber sheet forming the intermediate layer (c), and the coating amount of the hot melt adhesive is bonded to the inner layer and the intermediate layer. The surface, the joint surface of the intermediate layer and the outer layer are each 0.5 to 2.5 g/m2 (d), that is, at least one of (a) to (d) or a combination of the plurals is preferable. In particular, according to this configuration, the pressure loss (4) 1309170 of the mask body caused by the dust can be reduced, and the collection efficiency can be further improved by the above configuration. The area ratio of the point sticking to the entire area of the non-woven fabric is 15 to 25%, and the area of the sticking point is 0.2 to 2 mm 2 , which improves the shape retention of the mask body and suppresses fuzzing. Ideal. In the present invention, the term "pure-non-woven fabric" refers to a point-like pressure heating treatment in which a predetermined distance is applied to the entire direction of the fiber woven mesh, and the constituent fibers of the woven mesh are punctured. Under the heating, the > interlacing point of the fiber is melted. It is preferable that the above-mentioned intermittent application of the hot-melt adhesive is applied by a fibrous spray. If the form is configured for this, the above-mentioned intermittent coating can be easily carried out. The temperature at which the hot-melt adhesive is applied is 1 10 to 145 ° C, which is preferable because the effect of the electret of the intermediate layer is not lowered. [Effects of the Invention] According to the disposable mask of the present invention, it is possible to provide an electret which does not impair the intermediate layer even if the inner and outer layers and the intermediate layer are intercalated with a hot melt adhesive. The performance or effect is excellent in conformality, and it can suppress fuzzing and 'have a disposable mask with low pressure loss and high trapping performance. According to the manufacturing method of the disposable mask of the present invention, the manufacturing method in which the above effect is effective can be easily realized. [Embodiment] -8 - (5) 1309170 An embodiment of the disposable mask of the present invention will be described below with reference to the drawings *. Referring to Fig. 1, it is understood that the disposable mask 10 is a mask body 11' covering the nose and mouth of the wearer, and a pair of ear straps that are hung on the wearer's ear to hold the mask body 11 in a loaded state. 12, 12 constitutes. The mask body 1 1 'is a thermoplastic sheet member 13 and 14 having substantially the same shape and size as those having elastic non-elongation, and the peripheral surface thereof is attached to the face of the wearer 0 and is attached to the nose of the wearer. Formed with appropriate spacing between the mouths. However, if the mask body 1 1 ' is to ensure the required shape retention, it is also somewhat elastically extensible. The sheet members 1 3, 14 are joined together by heat sealing along the front edge 15 which is convexly curved toward the front of the two. The ear straps 1 2 ' are formed of thermoplastic sheet members 16 and 17 having the same shape and size as those having elastic elongation. The sheet members 116, 17 are provided near the front end portions of the sheet members, and are provided with openings 18, 19 through the ears of the wearer, and the base edges 20, 21 of the sheet members are joined by heat sealing. The sheet members 13, 14 are followed by end edges 22, 23. Referring to FIGS. 2(A) and (B), it is understood that the mask body 11 formed by the sheet members 13 and 14 is an inner layer 24 including a skin contact surface of the wearer when the mask is attached, and An outer layer 25 located on the non-skin contact surface of the wearer and an intermediate layer 26 interposed between the inner and outer layers 24 and 25 integrally with the inner and outer layers. The intermediate layer .26 is formed from an electret fiber sheet. The electret fiber sheet has a basis weight of 15 to 30 g/m2, an apparent density of 0.08 to 0.13 g/cm3, a fiber diameter of 55 to 4.0//m, and particularly a fiber diameter of 1.0 to 2.50 #m-9 - (6) 1309170 Meltblown non-woven fabrics are ideal for not only maintaining the low pressure loss required, but also achieving high collection efficiency, and in particular, the large contact area with dust. As a non-woven fabric material, it is a thermoplastic synthetic fiber such as a polyolefin-based, polyester-based or polyamid-based. The electret fiber sheet is obtained by electrifying the fiber sheet or the non-woven fabric fiber, and has a required amount of positive or negative charge on the surface of the fiber. The electretization can be carried out by a conventional method, for example, the methods disclosed in Patent Documents 1 and 2. Further, in the intermediate layer 2, depending on the apparent density and the fiber diameter, in order to appropriately control the pressure loss and the collection efficiency, a large number of fine pores may be formed in addition to the fiber gap. The inner and outer layers 24, 25 are based on a basis weight of 20 to 5 Og/m2, an apparent density of 〇. 〇9 〇.12g/cm3, and a fiber diameter of 10 to 40/zm. It is ideal for shape and fluff suppression, as well as the required low pressure loss and high trapping efficiency. The so-called "point-and-stick non-woven fabric" is defined before. The area ratio of the point sticking to the entire area of the non-woven fabric at this point is 15 to 25%, and the area of the stick is 0.2 to 2 mm 2 , which can maintain low pressure loss and high trapping efficiency, and raise the mask. It is desirable that the body 11 has shape retention and suppresses fuzzing. If the area ratio is less than 15%, and the area of the above-mentioned points is less than 0.2 m 2 , the desired shape retention and fuzzing suppression cannot be obtained. When the area ratio exceeds 25%, and the area of each of the above-mentioned points is more than 2 mm2, the rigidity of the mask body 11 becomes too high, and the mask attachment feeling is broken, so that the pressure loss is increased and the collection efficiency is lowered. -10- (7) 1309170 As described above, the basis weight of the inner and outer layers 24, 25 is larger than that of the intermediate layer 26, and the apparent density of the inner and outer layers 24, 25 is lower than that of the intermediate layer 26, and may be in the outer layer 25. The larger particles of dust are trapped, so that the smaller particles of dust pass through the outer layer 25, and are trapped as much as possible at the intermediate layer 26, and the breathing of the wearer through the inner layer 24 can be made easier. Furthermore, since the intermediate layer 26 is formed by the melt-blown nonwoven fabric, the fiber combining force is low, and the hair is raised in a sliding contact with other objects, and the inner and outer layers 24 and 25 can effectively protect the surface of the intermediate layer 26 and lift. The overall physical/mechanical strength of the mask body 1 1 , that is, the strength of the inner and outer surfaces of the mask body 11 and the overall conformability of the mask body 11 are desirable. The synthetic resin which is a non-woven material of the inner and outer layers 24, 25 does not necessarily have to be the same as the intermediate layer. The inner and outer layers 24, 25 and the intermediate layer 26, the joint faces of the inner and outer layers 24, 25 and the intermediate layer 26, that is, the joint faces 24a and the joint faces 26a, the joint faces 26b and the joint faces 24, are interposed intermittently. Bonded to the bonding surface 27 of the bonding surfaces. Although not shown in the drawings, the adhesion amount ' of the intermediate layer 26 to the bonding faces 26a, 26b of the inner and outer layers 24, 25 is set to be larger than the bonding faces of the inner and outer layers 24, 25 with respect to the intermediate layer. The amount of adhesion of the hot melt adhesive 27 of 24a, 25a is also small. This can minimize the influence of heat generated by coating with respect to the electret fiber_solder 27 of the intermediate layer 26, and can minimize the mesh clogging of the intermediate layer 26 while suppressing Pressure loss. The inner and outer layers and intermediate layers 24, 25, 26, in particular, directly spliced to the inner layer 24' of the wearer's skin so as to contain the possible range of makeup and have a special powder and the knot and the heat between the trees Preparation of the agent 26 -11 - (8) 1309170 A drug or chemical agent with an antibacterial or deodorizing effect, such as cyclodextrin, is more reasonable. Further, as the hot-melt adhesive 27, it is preferable to use a synthetic rubber having a cosmetically acceptable range and a low odor. The mask body 11 having the above configuration can be obtained by a method described later. The first and second fiber webs (point-bonded nonwoven webs) to be formed as the inner and outer layers 24, 25, and the third fiber web (melt-blown nonwoven fabric) which is formed in advance as the intermediate layer 26 The joint surface of the net, that is, the so-called curtain coater which is blown by the hot-melt adhesive 27 with air, with respect to the joint faces 24a, 25a, to coat the adhesive The amount of the cloth is 0.5 to 2.5 g/m 2 , preferably 0.8 to 1 _5 g/m 2 , and is applied to the joint faces 24 a and 25 a in a fibrous form, that is, intermittently. In the coating, the temperature of the hot-melt adhesive 27 is such that the constituent fibers of the first and second fiber webs (the inner and outer layers 24, 25) are not melted and/or for the third fiber web ( The electret fiber of the intermediate layer 26) has no effect of affecting or affecting a small temperature, that is, a dissolution temperature of 11 〇 to 1 451, which is preferable. However, at this temperature, the time ejected by the coating device of the hot-melt adhesive 27 with respect to the first and second fiber webs can be obtained from the injection time point until the first and second fibers are It is also more desirable to take this control into consideration when the time at which the woven mesh is joined to the third fiber woven mesh is appropriately controlled and the temperature is 1 to 20 to 140 °C. If the coating amount of the hot-melt adhesive 27 is less than 0.5 g/m2, the interlayer between the inner and outer layers 24 and 25 and the intermediate layer 26 may be peeled off. If the above-mentioned 2.5 g/m2' is exceeded, low pressure loss cannot be ensured. And high trapping. -12- (9) 1309170' Next, the joint surfaces 24a and 25a of the first and second fiber webs are opposed to the joint surfaces 26a and 20b of the third fiber web, respectively. The fiber web is superposed on the fiber web of the latter under appropriate pressure, and the first, second and third fiber webs are joined by a heat-fusible adhesive 27 to form a laminated fiber web. Then, the laminated fiber web is cut into the shape of the sheet members 13, 14 of the mask body 11, and the sheet member is heat-sealed at the front end edge 15 to form a mask body 1 1 . The mask body 11 is applied to the joint faces 24a and 25a of the first and second fiber webs in a fibrous manner by a so-called curtain coater known in the art, which is blown by air. The joint faces 24a and 25a are joined to the joint faces 26a and 26b of the third fiber web, respectively, and the fiber densities of the first and second fiber webs are lower than those of the third fiber web. Therefore, the % adhesion amount of the hot-melt adhesive 27 of each of the joint surfaces 26a and 26b of the first and second fiber webs of the third fiber web is higher than that of the first and second fiber webs. The amount of adhesion of the hot-melt adhesive 27 to each of the joint faces 24a and 25a of the third fiber web is small. Further, as described above, in particular, the first fiber woven net of the inner layer 24 contains a cyclodextrin which exhibits the antibacterial or deodorizing effect, and the hot-melt adhesive agent uses the rubber-based one. . <Examples> A polypropylene fiber having a basis weight of 20 g/m2, an apparent density of 〇llg/cm3 -13-(10) 1309170, and a fiber diameter of 2.5 vm was respectively produced and subjected to an electret The processed melt-blown non-woven fabric, and a composite fiber having a basis weight of 30 g/m2, an apparent density of 0.09 g/cm3, a fiber diameter of 26, and a sheath of polyethylene ("ESC" manufactured by Chisso Co., Ltd.) The dots formed are not woven. A hot-melt adhesive (trade name "ever grip" "FM 165") was applied to the single side of the non-woven fabric at a gravure spray of 1 g/m2. By laminating the coated surface on both sides of the melt-blown nonwoven fabric within 1 minute after the application, the melt-blown nonwoven fabric is sandwiched by a non-woven fabric under appropriate pressure, and the nonwoven fabric is joined. A sample was prepared. <Comparative Example 1 > A sample was prepared under the same conditions as in the examples, except that the above-mentioned hot-melt adhesive was applied to both surfaces of the melt-blown nonwoven fabric. <Comparative Example 2 > • A melt-blown non-woven fabric composed of a polypropylene fiber having a basis weight of 20 g/m 2 , an apparent density of 0.1 lg/cm 3 and a fiber diameter of 2.5 μm and subjected to electret processing The single-area layer of the non-woven fabric is a spunbonded non-woven fabric composed of polypropylene fibers having a basis weight of 3 Og/m 2 , an apparent density of 0. 〇 9 g/cm 3 and a fiber diameter of 26 μ m, and the other non-woven fabric A single-area layer is the same spunbonded nonwoven fabric as the spunbonded nonwoven fabric described above. At the time of the above-mentioned lamination, the polyethylene resin is applied to each side of the melt-blown non-woven fabric to form a straight-line shape (strip shape) having a thickness of 3/zm, a width of 1 mm, and a spacing of 3 mm. The layers of the above non-woven fabric are joined. _ 14 - (11) 1309170 <Experimental Example> The measurement of the air permeability (pressure loss) and the collection efficiency was carried out in accordance with "JIS Τ 81δ1 dust mask". For the measuring device, the mask of MASKTESTER AP-63 1 0FP manufactured by Shibata Science was used. Further, the measurement of the number of rubbing times until the raising of the hair was carried out according to the "JIS l φ 0 8 4 9 F rubbing fastness test", and the sample was subjected to a load of 500 g, and the fluffing was measured from the first several times. The experimental results are shown in the table below. [Table 1] Air permeability (cc/cm2/sec) Collection efficiency (〇/〇) Number of frictions up to fluffing Example 63 90 30 Comparative example 1 60 82 30 Comparative example 2 28.4 91.1 1 [Simplified description of the drawing Fig. 1 is a perspective view of a disposable mask of the present invention. Fig. 2(A) is an enlarged cross-sectional schematic view taken along line 11_11 of Fig. 1. (B) is its separation diagram. [Description of main component symbols] 1 1 : Mask body 24: Inner layer 15-(12)1309170 25 : 26 : 24a : 25a : 2 6a, 2 7 ·_ Joint surface of the outer layer of the inner layer of the outer layer 2 6 b: joint surface hot melt adhesive of the intermediate layer
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