TWI270403B - Molded filter element that contains thermally bonded staple fibers and electrically-charged microfibers - Google Patents

Molded filter element that contains thermally bonded staple fibers and electrically-charged microfibers Download PDF

Info

Publication number
TWI270403B
TWI270403B TW92117642A TW92117642A TWI270403B TW I270403 B TWI270403 B TW I270403B TW 92117642 A TW92117642 A TW 92117642A TW 92117642 A TW92117642 A TW 92117642A TW I270403 B TWI270403 B TW I270403B
Authority
TW
Taiwan
Prior art keywords
fiber
fixed length
fibers
molded
microfiber
Prior art date
Application number
TW92117642A
Other languages
English (en)
Other versions
TW200401659A (en
Inventor
James Emmons Springett
Seyed Abolhassan Angadjivand
Original Assignee
3M Innovative Properties Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Publication of TW200401659A publication Critical patent/TW200401659A/zh
Application granted granted Critical
Publication of TWI270403B publication Critical patent/TWI270403B/zh

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/14Other self-supporting filtering material ; Other filtering material
    • B01D39/16Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B01D39/163Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A41D13/1107Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape
    • A41D13/1138Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a cup configuration
    • A41D13/1146Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a cup configuration obtained by moulding
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B7/00Respiratory apparatus
    • A62B7/10Respiratory apparatus with filter elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/14Other self-supporting filtering material ; Other filtering material
    • B01D39/16Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/48Processes of making filters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00Gas separation
    • Y10S55/05Methods of making filter
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00Gas separation
    • Y10S55/35Respirators and register filters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00Gas separation
    • Y10S55/39Electrets separator
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2904Staple length fiber
    • Y10T428/2905Plural and with bonded intersections only
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2904Staple length fiber
    • Y10T428/2909Nonlinear [e.g., crimped, coiled, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2922Nonlinear [e.g., crimped, coiled, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2929Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608Including strand or fiber material which is of specific structural definition
    • Y10T442/614Strand or fiber material specified as having microdimensions [i.e., microfiber]
    • Y10T442/619Including other strand or fiber material in the same layer not specified as having microdimensions
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608Including strand or fiber material which is of specific structural definition
    • Y10T442/627Strand or fiber material is specified as non-linear [e.g., crimped, coiled, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608Including strand or fiber material which is of specific structural definition
    • Y10T442/627Strand or fiber material is specified as non-linear [e.g., crimped, coiled, etc.]
    • Y10T442/629Composite strand or fiber material
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/637Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/69Autogenously bonded nonwoven fabric
    • Y10T442/692Containing at least two chemically different strand or fiber materials

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Pulmonology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Thermistors And Varistors (AREA)
  • Filters And Equalizers (AREA)
  • Networks Using Active Elements (AREA)
  • Electrostatic Separation (AREA)

Description

1270403 玖、發明說明: 【發明所屬之技術領域】 本發明關於一種模鑄過滤元件,其具有熱結合定長纖維 及非熱結合帶電微纖維。本發明濾材可用於保護使用者及 其它不曝露於丨亏染物之口罩。 【先前技術】 以微纖維捕捉空氣中粒子之過濾元件已廣為使用多年。 含微纖維濾材一般是在呼吸時提供穿戴者乾淨過濾空氣一 參考如Braun等人美國專.利第5,656,368號,Kronzer等人美國專 利第5,307,796號,及Kmeger等人美國專利第4,729,371號。一般 在械纖維上會加電荷以增加捕捉能力。198〇年,Kubik等人 介紹一種將電荷在纖維製成時加到熔噴微纖維方法(美國專 利第4,215,682號)。Kubik等人之後,陸續發展出其它製作帶 私械纖維的帶電技術—如KlaaSe等人美國專利第4,588,537號 Deeds等人美國專利第5,227,172號,及Angadjivand等人美國 專利第5,496,507號。 以其帶電微纖維網片作濾材時,多半以另一只結構體支 撐。網片本身通常有足夠整體性成為墊狀,但在結構挺直 性不夠超出短暫外型更久。因此在作為呼吸器時,該具微 纖維濾片以規則性支撐在一只永久成型層上。濾片位在成 型層外,固定其上以得到模鑄構造。揭示以另外成型層支 撐具微纖維滤層為呼吸器之專利例子如Berg之美國專利第 4,536,44〇號,Dyrud等人美國專利第七㈧7,6…號,及Sk〇v美國 專利第4,850,347號。 86213 1270403 在ry及Dyrud等人專利中,成型層包含在一模轉網片所 有纖維交又點結合纖維固定。用於達到成型層所需模型纖 、准m结合二成份纖維,(寸較粗或大,如ίο丹尼或 在Skov命J巾’成型層%式為一般開放式模鱗塑材網。 、除構k以外來彳政纖維過滤片亦有以織物,定位帶,纖 ㈣’或纖維維持成型構造。—參相_等人之美國專利 第5,656,368號,其說明以固型元件置於不織布片波型頂部以 保持波浪狀態。Braun等人亦說明該聚合性微纖維不織布片 要保持鬆弛狀態,可得到最佳過濾效果。事實上,過滤參 數如壓力降及壽命在聚合性微纖維受影響均有負面影響。 另—種維持微纖維不織布形狀方法中,不以如成型曰層外 在結構固定形狀,而是利用微纖維本身。此法見於如职 寺人美國專利第6,057,256號,微纖維以二成份製成:第一種 為支持纖維成份,第二種為熱軟化或結合成份。模禱時, 加溫網片溫度高於第二成份軟化溫度,以在相鄰纖維間產 j結合。結合係在軟化成份於纖維交又處產生。因此,第 -成份對網片提供纖維性支撐,避免陷塌或扁下,第二層 ,可模铸成特Μ。該產物亦可包含^長纖維以開^ 鬆網片。 除了KrUeger等人所用雙成份微纖維產物外,且它支撐並 形成含微纖維過濾、網片方式均利用個別或非一㈣支斤:構 。這此產品需另外以不同於支揮結構方式製作含微^片 且需有-種結合兩元件為成品物件之裝置。為了這些額 外製作步驟’以及步驟所需额外設備,均造成產品成:增 86213 1270403 加。此外,要小心注意處理含微纖維片,使不致受傷害造 成如Braun等人所述之過濾效果損失。
KmegeeWW 3_別支撑結構而模造出含微纖維 過濾元件,然該產品係利用微纖維本身提供面罩之結構。 當微纖維為此目的結合時,會傾向不能進行自氣流過滤粒 子的功能。 【發明内容】 本發明提供-種新穎過濾元件,可適當包含或具有含熱 結合定長纖維及非熱結合帶電微纖維之多孔模造片。該模 造片以在定長纖維間於纖維交錯點結合而維持在出模形狀。 本發明過濾元件可製作不需個別支撐結構之成型結構。 此新穎過濾、元件亦不需結合微纖維以維持不織布片成型形 狀,由於熱結合定長纖維與非熱結合帶電微纖維在同一層 ,此片可壓模成各種構造,不需用到熱結合雙成份纖維。 不再需用個別支撐結構,或是結合微纖維制另外的結構。 本發明過滤元件可達到良好過滤效果及良好結構一體性 所需組合’即使過濾元件在壓模時已受l縮亦同。雖然一 m當聚合性微纖維不織布片經過如壓模加王後,合對 塵力降或壽命等過料數有彡響,然此處仍可㈣良 好效率及結構特性。以往所知過濾結構,如Braun等人之 ,368號專利中,需保持鬆散片狀況以得到最佳過濾效率。然 在本务明中部能表現出良好機械及過遽性質,同時簡化製 作成型m件㈣。本發明因此可製作適宜用於壓模呼 吸面罩之壓模過遽元件。 86213 1270403 字彙 本發明中所用以下名詞定義如下: ’’丹尼數”代表9,0〇〇束絲長的公克重量; ’’帶電’’代表纖維帶有電荷,其可測量並存在纖維上大過 短暫轉換期; 過濾兀件”代表一種流體可穿過元件,其可移出穿越其 流體之污染物; ”微纖維”代表具不定長度纖維,平均幾何纖維直徑約15 微米(μιη)或更小; 成型片代表一種實質兩尺寸大於第三尺寸結構物,且 經成型為所需形狀如面罩,爐過材,濾板或多滤板等等; π成型溫度”代表片受熱達到成型時溫度; ”非熱結合”代表該纖維在適宜成型為含該非熱結合纖維 片時溫度下,實質不與相鄰接觸纖維結合; Π多孔性’’代表流體可穿過; ”固成份”代表片中固體百分比,為無單位分數,數目愈 大表示固體成份愈多;及 軋化μ度代表纖維成份軟化到可使該纖維成份結合另 、截、准並保持冷卻後亦為結合狀態之最低溫度; ”定長纖維”代表有一定長度之纖維; ’’可熱結合纖維”代表纖維可在加熱到至少高於軟化溫度 並冷卻後可結合到相鄰接觸纖維者·, 至少高於軟化溫度並冷 熱結合纖維’,代表纖維經加熱到 卻後可結合相鄰接觸纖維。 86213 1270403 【實施方式’】 圖1所示為可用於製作本發明成型過滤元件之不織布片10 。如相片所示’片1G可含有熱可結合定長纖維12及非熱結 合微纖維14。定長纖維12分佈在整個非熱結合微纖維14網 絡。孩熱可結合定長纖維12形成較單獨非熱結合微纖維為 鬆散’較疏片。該預成型片—般固成份約5到遍,更多約 10到20/。U具體貫例中,該片包含約如到兀邊熱可結 合定長纖維,更佳約40和_熱可結合定長纖維,以片 中纖維重計算。該片亦較佳包含約3_7()痛㈣可結合 微纖維:更佳約40到6G福非熱可結合微纖維,以片中纖 、’隹重w十异。更佳具體實例中可含約5〇到⑼痛微纖維,及 約40到50德定長纖維。因此,彳中以含微纖維重量大於 定長纖維者為較佳。 定長纖維12為彳熱結纟,故這些纖維在加熱高過其軟化 點並冷卻《麦,可與相鄰接觸纖維結纟。定長纖維有一定長 度,亦即其係經機械切為特定預定或固定長度。其同時經 加工使纖維直徑更接近其擠㈣通過小孔直徑。定長纖維 長度般小於2英呎或〇·61米,或小於丨英呎或〇3〇5米。定長 纖維較佳長度約1到8公分(cm)(〇 4英吋到3 2英吋),更佳約 cm到5 cm (1到2英吋)。定長纖維平均幾何纖維直徑一般 平均大於約15陣,一般平均大於20, 30, 40或50 此纖 、隹直彳二可依以下所不試法計算出。定長纖維一般丹尼數大 万、、勺3 g/9,000 m ’且大於約4 g/9,_㈤。上限部份丹尼小於 、’、勺50 g/m而較多為小於約2〇 g/m到Μ g/m。 86213 -10- 1270403 定長纖維一般為合成種類,故可以在模鑄階段結合。定 長纖維一般由加熱及冷卻後可結合其它纖維之聚合性原料 製成。本發明適用定長纖維可由聚對酞酸乙二酯,聚酯, 聚乙細’聚丙細’共聚醋’聚驢胺或其組合製作。定長纖 維一般在結合後仍維持纖維結構。定長纖維可如Hauser美國 專利第4,118,531號所述之彎曲纖維。彎曲纖維沿其長度有連 續歪曲,捲屈或折彎特性。較佳含彎曲纖維之定長纖維上
,應含有每公分約10到30彎曲(每英吋5.1到11_9彎曲)。定長 ~二· ·
纖維可為單一成份纖維或多成份纖維。商品級單成份熱可 結合定長纖維例包含 Kosa of Charlotte,North Carolina 之 KOSA T_ 255,T_259,T_271 及 T-295 ;及 Foss Manufacturing Inc·,of Hampton, New Hampshire 之 Type 410 PETG,Type 110 PETG。多成份纖維可 有兩種或更多纖維成份,其中至少一成份在加熱會軟化, 以使定長纖維在纖維交叉點相互結合。多成份纖維可為雙 成份纖維,其具並延伸相鄰結構,共延伸同心覆核結構, 或共延伸偏心覆核結構。雙成份纖維一般特性為具有兩種 主要纖維成份。本發明熱可結合定長纖維雙成份纖維例包 括KOSA T-254, T-256,及聚丙晞/聚乙烯雙成份纖維(CHISSO ES,ESC,EAC,EKC),及聚丙烯/聚對g太酸乙二酯雙成份纖維 (CHISSO EPC),及聚乙烯/聚對酞酸乙二酯雙成份纖維(CHISSO ETC),由 Chisso Inc. Osaka,Japan所提供。 本發明所用微纖維平均幾何纖維直徑約15 μιη或更小,更 一般約為12 μπι或更小。與定長識維有定長度不同,微纖維 長度不定。微纖維平均幾何纖維直徑一般約3到10 μιη。 86213 -11 - 1270403 碱纖維可為纖維片或帶電熔噴微纖維。熔噴微纖維或 MF可,由製造纖維材料擠過模孔或氣體流產生—參考例如 Kubik等人美國專利第4,215,682號。炫嘴微纖維在任意糾纏下 y成片,通常具足夠整體性,可視為蓆片處理。但其一般 無法在不嚴重影響片過濾性質模鑄出所需結構。可用來製 作溶噴微纖維材料範例,揭示於Bau_n等人美國專利第 5J06,綱號,Pet_美國專利第4,419,993號,施咖_國重請 專利第况脱號,1_等人美國專利第5,472,481號及第 ,1’576號以及給尺⑽纪如等人美國專利第I9%观號。噴 微纖維幾乎可由任何熱塑性製纖維樹脂製作。為確使片材 保持艮好電性或充電分離,微纖維取非導性樹脂製作,亦 即該樹脂在室溫時(22。〇體電阻值為1〇14 〇hm_cm^m 佳者,體電阻約為㈣Gh_或更大。聚合性製纖維原㈣ 電阻值可以ASTMD257_93量測。製作溶喷纖維之製纖原料亦 應貫質不含如抗靜電劑成份’其可能增加電導性或是影塑 纖維接受保留電荷之能力。可料製聚合性纖維原料之^ 合物例子包括含聚碳酸酯’聚酯,聚醯胺’聚尿素之埶塑 :聚合物’崁塊共聚物如苯乙缔_丁二缔_苯乙埽及苯導 *丙”苯乙缔之崁塊共聚物,反聚稀類如聚丙 及聚(4_甲基-戊缔)’或該等樹脂之組合物。針對卿用 :面,纖維-般由聚4-甲基蝴及/或聚丙缔製成。較佳 者,絲贺微纖維是由同質聚合物聚丙缔製作,因並 持帶電,尤其在潮濕環境中。 ’、月匕 除了熱結合定長纖維與非熱結合微纖維外,本發明過滤 86213 -12- 1270403 元件另可包含例如由聚酯及/或聚丙埽製作之非熱結合定長 纖維,包含黏性雷隆及FR纖維以吸收水份或提供'耐性。 纖維原料可含添加物以增加過滤效果,包括等人在 美國專利第5,025,052號及第5,099,026號所述添加物,且可以 含低量伸縮烴類以改良過濾效果一參考例wR〇usseau等人美 國專利第6,2^22號。纖維片亦可製為具抗油霧性,如_ 等人美國專利第4,874,399號,及給11〇11规如等人美國專利第 6,238,466號及第6,068,799號兩者。該纖維片亦可氟化,如國 際出版WO 0_737號所述。—項在油霧環境下較佳過遽污 染物具體實例中,纖維在纖維表面有氟原子,如j〇nes等人 吴國專利第6,409,806號,第6,398,847 B1及6,397,4_所教導。 圖2所不為含熱結合定長纖維及非熱結合微纖維兩者模鑄 片放大照片。如圖所示’定長纖維12在纖維交又點_ f結合。另一方面,微纖維14仍維持其未結合定位。雖然 疋長纖維12在纖維交叉點相互結合,但結合不需在所有此 二〜δ纖維結合僅需在足夠使模鍀產品在超過轉型時間 Τ持所需形狀數目交叉處產生即可。定長纖維間結合,提 ,半堅固三次元纖維格於模鑄片1〇,内。由於定長纖維經加 截、准内結合成份軟化溫度以上,且可能到溶點,故纖 、准結合成份軟化並於纖維相互接觸13處足夠點溶入。為避 =在挺麵加工時份及或是改變微纖維整體性,故片模鑄必 需低於實質所有微纖維成份軟化點。以熔噴技術生產之微 日戴隹雖在文奋噴時頻向互相結合或互相到纏,但在模禱加熱 時並不會相互結合。微纖維可能與定長纖維結合成份在纖 86213 -13- 1270403 維軟化及硬北時結合。如圄 、 、二 4圖所不’足長纖維12熔化並在纖 維又叉點13合一。此定县總祕、Λ丄人 + 長減、准 < 結合促使模鑄產物維持成 形時結構。模鑄產品10丨包本夕 匕《 <疋長纖維與微纖維所佔重量 百分比,相同於圖1非模鑄片者。 本發明模鑄過濾元件厚度約_4議。㈣元件可厚達6 mm’但-般約在_3.5 mm厚。本發明已發現在約口㈣ mm厚度下,模鑄產物可右自 、 百艮好過/慮效果。模鑄過滤元件固 成份約5到30%,-般約1〇到2〇%。其基重約%到勘咖2, 一般約 100 到 200 g/m2。 圖3為可由圖_2模鑄片製成之模轉產品例。如圖所示,該 產物可為符合穿戴者口鼻戴上之杯形呼吸面罩16形狀。面 罩16可在面罩i中央有排氣閥(未示),以快速將呼出氣體 自=邵排出。面罩16可為大致杯形結構,β緊密戴上人體 口开面罩16而與4戴者臉邵在周邊18為實質不漏接觸。 面罩16可以彈性帶20延伸到穿戴者頭與頸部,拉緊使面罩 周邊緊貼臉部。面罩16在面罩體與穿戴者臉部開形成空間 。此空間被面罩體22與大氣環境隔絕。穿戴者吸氣時,空 氣必須先通過面罩體22才能由穿戴者吸入。面罩16亦可^ 鼻夾24位在面罩體内或外部,或在層間,以在鼻與頰 緊密貼合。 ~ 51 過濾面罩16不需與圖3所示結構相同。面罩亦可如美國專 利第6,026,511號,第6,123,077號,及第6,394,〇9〇則號所示為平 摺口罩。或可如Japuntich美國專利第4,827,924號所示膨脹杯 形結構。鼻夾24可為Castiglione美國專利第5,558,〇89號之構造 86213 -14- 1270403 。面罩亦可在周邊有熱顯示密封以使穿戴者確定是否緊密 貼合一參考Springett等人美國專利第5,617,849號。此外,該呼 吸過滤元件亦可為不同於模鑄面罩體結構。該過濾元件可 模鑄成適用於過濾筒,具有特定形狀如彎曲面以更靠近穿 戴者臉邵。過濾筒可以移動附在面罩而戴於人體口鼻上, 如Bums與Reischd等人美國專利第5,〇62,421號所述。 圖4為圖3面罩體22模剖面。如圖所示,該面罩體22僅以 單層提供過濾及定型性質。如上所述,以往技藝面罩需有 ~ ' · 個別支撐結構或層以提供面罩結構整體性。本發明為一種 不需使用單獨成型層及含微纖維過濾層,就可以提供良好 過濾效果之過滤面罩。過濾與結構性質併入一層中,該層 包含熱結合定長纖維及非熱結合微纖維。單層產品雖已具 良好過濾效果,其它如額外過濾媒介層亦可加入,包括帶 電BMF層可用來增加過濾性質。此種片材一見述於 等人美國專利第4,795,6ό8號,Reed等人美國專利第4,874,399號 ’ Meyer等人美國專利第4,988,560號,及Angadjivand等人美國 專利第5,496,507號。其它可用過材例述於美國專利第5,898,981 5虎’弟 5,419,953 號’第 4,798,850 號,第 4,215,682 號,第 4,178,157 號’弟3,998,916號,及第3,644,605號。這些滤材可包括多層 複合芝氣過濾材,使用耐火預濾層,摻配纖維濾材,及微 細帶電纖維片。此外,粒子材料如活性粒子(能提供功能如 吸附’吸收’觸媒等之粒子),如活性碳者可加入片材一如 Braun美國專利笫3,971,373號一製作不僅可過濾粒子,且包括 氣體污染物如酸氣,有機蒸氣,氨氣及其組合之過濾元件。 86213 -15- 1270403 本發明過濾元件具極優良過濾效果,如以下介紹品質因 素 Qf表示,Qf值大於 0.30 (mm EbO)·1,更佳大於 0.40 (mm H20)·1 ,甚至大於0.70或0.80 (mm HbO)-1亦可製得。 本發明除用於呼吸面罩外,亦可有其它形狀結構,包括 為波浪或摺扇形空氣過濾器,用於如爐用濾材,用於車輛 ,船隻或飛機,及室内用滤材,包括空調濾材。
圖5為裝置29圖,其係用來製作含定長纖維及熔噴微纖維 片10。裝置29藉由模孔30擠出熔融製纖原料製作熔喷微纖 維。液喷或其它型式微纖維亦可製作本發明微纖維。所示 微纖維喷出裝置部份為傳統結構,見於如Wente,Van A.
Superfine Thermoplastic Fibers, 48 Indus. Engn. Chem. 1342 et. Seq. (1956),或 Report No. 4364 of the Naval Research Laboratories (May
25,1954),題目為 Manufacture of Superfine Organic Fibers by Wente, V. An·; Boon,C.D·;及 Fluharty,E.L·。此結構包含模 26,具有擠 出室28,液化製纖原料由此送入。模孔30可位在模面前端 直線上,製纖原料由此擠出。配合氣體孔32位在模30附近 ,提供一般為熱空氣氣體推出高速度。高速氣體流抽拉及 放長擠出製纖原料。製纖原料固化後以微纖維行進到收集 器34。收集器34 —般為開小圓孔篩網,在此例中為封閉環 皮帶。收集器亦可為其它型式,如柱狀,鼓狀或平面篩網 。收集器亦可為大致柱形表面,沿軸旋轉、沿軸向移動, 使收集器上一點如螺旋般移動一參考Berrigan等人美國專利 第6,139,308號。蒒網後可安置一組氣體抽收裝置,協助置放 纖維及抽出氣體。 86213 -16- 1270403 熱可結合定長纖維12可如圖5裝置所示引入噴微纖維14流 ’利用一滚輪36位於該噴微纖維裝置上方操作。取整塊纖 維片38,通常為如收集機或“Ran(j0-Webber”製作之鬆散不織 布片,沿驅動輪42下方桌台40推行,使前端接觸輪%。輪36 沿箭頭方向轉動,自片38前端提起纖維,自纖維間分開纖 維。提起纖維通過管42由氣流輸送到噴微纖維流,並與微 纖維混合。氣體由輪轉動自然產生,或是以輔助風車或鼓 風機通過管44產生。 混合後定長纖維與微纖維流繼續向收集器34,纖維混成 自由互混及糾結纖維片1〇。近觀之下,定長纖維與微纖維 可无份混合,舉例而言,混合之前仍有小團定長纖維自為 一體,如初裁切之一束者。所得片1〇可由收集器剝下,捲 繞於儲存輪,再作裁切加工,處理或模鑄。 製成之複合材料可為如所示裝置的單層,或可為肉眼分 不出的多層產物。多層產物可以利用圖5裝置重複兩次或多 次相同收集片而成,或是加入其它混合及積層裝置於收集 帶長度上而成。 $ 本發明過遽元件在片上有帶電以增加過漉效率。電荷可 僅在微纖維上,或是在微纖維與定長纖維兩者上。若定 纖維也要帶電,則其應有非導性表面,才不會失去電n 因此足長1維應以非導性聚合原料製成,如上述微纖維者 Roussean等人$ g專利第5,%8,635號揭*利 纖維之過濾材。纖維可w、. 貢锨 ^匕§表面#]質劑如氟,以改良、、山 霧過滤效果-參考iGnes等人美國專利第6,398,847 Μ。電荷可 86213 -17· 1270403 以已知技藝如諸到不織布纖維片,例如Kubit等人美國專利 第4,215,682號’ Nakao美國專利第4,592,815號,如职咖―等人 、 美國專利第5,496,507號所述。這些方法包括Angadjivand等人 f507號專利的加濕法,或Nakao的,815號專利中電暈法或其組 合方法。此外,Brown等人美國專利第4,798,85〇號的磨擦法 亦可使用。其它較近期帶電法如Angadjivand等人美國專利第 6,375,886 B1號,Eitzman等人美國專利第6,406,657號,及美國 ‘ 專利申請第〇9/416,216及〇9/548,δ92號各別為國際專利出版WO 鲁· 01/27381及WO 01/80257號。這些技藝包括利用非水性極性液 體,及在水及/或極性液體與纖維間產生充份接觸。已知加 濕法是在片上喷灑水滴流,壓力足夠提供改良過濾的電荷 . 。達到最好效果的壓力要視所用噴頭,製片聚合物種類, 聚合物添加劑濃度,片厚及密度而定,尚包含是否有先以 電暈法處理過。一般使用壓力約10到500 psi (69到3450 kPa)。 較佳者,提供水滴水要非常純。蒸館水或去離子水優於自
來水。 圖6為適宜充片之喷頭方式45實例。纖維片10由支撐方式 46運送,可為皮帶,較佳為多孔篩網或布料。喷水頭50噴 水48,以泵(未示)提供水壓。喷水48在撞擊點52撞擊片10。 較佳狀況下,在多孔撐體下方有真空,抽拉噴水通過片, 減少乾燥用能源。 其它適用充片噴灑裝置例包括Angadjivand等人f 507號專利 所示霧化器。此裝置中,由水管送來的水與氣管送來的壓 縮空氣,均供入到噴嘴,以喷霧泵動作加壓,強制水通過 86213 -18- 1270403 噴嘴後形成噴霧狀。 片上充電量可以已知方式量測,包括熱激排電(TSD)技術 ,參考Angadjivand等人美國專利第6,375,886號。此模鑄帶電 濾材中,較佳含有具維持電荷纖維,一般需保持電荷到濾 材使用壽命結束。 圖7-9為形成根據本發明面罩外殼22之裝置%。殼22可藉 不織布片10通過選擇性預上皮段56,加熱段58及冷模鑄段6〇 而製得。選擇性可以作一層平滑皮蓋住片(未示),與片1〇 成下壓位置,使穿戴者更感舒適。適用之蓋片見― 等人美國專利第6,041,782號。此蓋片可由紡結纖維或熔喷或 微纖維製作。 片10在預上皮段56中,加熱到片表面62及64上定長纖維 合成份軟化。片下表面62及上表面64接觸加熱輪的及沾以 軟化可結合纖維成份。離開滾輪66及68後,纖維軟化成份 硬化,表面62及64上纖維相互結合。片1〇再送到移動烤箱 皮帶70,進入加熱段。 加熱段58是以紅外線(IR)加熱器72及熱風撞擊74通過圓孔 76加熱片10可熱結合纖維,以軟化全片中纖維可結合成份 。烘爐帶有網目結構,容許IR熱及熱風撞擊表面62^64: 模鑄/加熱過程需小心控制,使微纖維保持在不熱結合狀態 。此點在模鑄時避免微纖維自主結合發生可達到。Z長纖 維熱結合,提供模鑄過滤元件内纖維一種近固態三元晶格 。熱結合纖維晶格維持面罩於模鑄形狀,且不會抑制 通過纖維網絡。 86213 -19· 1270403 片10加熱棱,送到冷模鑄段60,此時纖維在片中結合成 仍為軟性。片10經帶78及80送到未加熱模具82及84間,在此 成型為杯狀殼22或面罩22外殼。旋轉輪86式組件可用來提 供連續式成型。旋轉輪86包含第1及第2旋轉裝置,各為路 及90。成型組件82及84各別依逆時鐘方向及順時鐘方向旋 轉,各由在鏈輪78上的鏈條92驅動。成型點上,成型組件 82及84接合壓片10成杯形殼22。圖7-9所示裝置在&〇11汉1>等人 美國專利第5,307,796號中有更詳細說明。 本發明過濾元件及面罩具有結合一體之成型及過濾層, 亦即維持外形與良好過濾效果均以單一模鑄片提供非 靠事後接合一起的兩個別片或層提供,一般在周邊接合。 本發明過遽元件整體性可使成型與過滤特性維持不變,除 非完全破壞過濾元件本身。 μ 實例 以下測試方法係用來評估片及模鑄過濾元件: 氣化納粒子穿透 —…,'^ ^ ^ TSI Incoiporat
St· Paul,Minnesota,型號 8130 的 AF丁儀哭。穴、、掛忐丄 丨我。。以/辰度在每立方 20 mg (mg/m )氯化鈉(NaC1)作為噴溶膠。 ’、叫以面逮度1 cm/sec供應。穿透時量測模鑄濾片前 表示^米水 平均幾何纖維直徑 樣本的顯 微平均幾何纖维直徑是取片 86213 -20- 1270403 片樣本以置一只片樣本於電子掃描顯微鏡下,並以約100 埃(A)金/鈀蒸氣電鍍纖維。電鍍使用DENTON Vacuum Desk II Gold Sputter裝置(DENTON Vacuum,LLC,1259 North Church Street, Moorestown,New Jersey,08057, USA),利用 40 毫安培錢鍍陰極電 鍍源,室真空為50毫托,係由125-150毫托氬氣流供應。電 鍍時間約45秒。鍍後樣本插入LEO VP 1450電子掃描顯微鏡
(LEO Electron Microscopy Inc.5 One Zeiss Drive, Thoumwood, New York, New York 10594),於0。傾斜15仟瓦(kV)加速電壓,及15 mm WD (工作距離)下取相。以ΙΟΟΟχ放大率取電子影。相以定微 纖維直徑,而以500或250放大率以定定長纖維直徑。樣本表 摹 面電子影相以個人電腦配合德州大學的UTHSCSA (University of Texas Health Science Center in San Autonio)影相工具,使用 Windows 2·00版平台分析。進行影相分析前,先以影相工具對顯微鏡 放大率校正,再對樣本電子影相處理,使每條纖維寬度均 經測量。僅對各影相個別纖維(未結合或結成索纖維)測量 。各樣本取至少18到20定長纖維及至少66到116噴微纖維測 量。纖維尺寸是以一定數量下平均微米(μιη)直徑列出。 模鑄物件挺度測量 模鑄過遽元件挺度以King Stiffenss儀器測量,Jaking & Co., Greensboro, North Carolina。挺度以推動 2·54 cm 直徑,平面之 8.06 cm (3.175英吋)深度探棒進入過滤元件力量測定。探棒元件 置於過濾元件外側,垂直於過滤元件置放平台角度測試。 模鑄過濾面罩置於平台,面罩凸起侧朝向對中該探棒。探 棒以32 mm/sec速度降入面罩,接觸面罩,壓到一定程度(21 86213 -21 - 1270403 毫米)。探棒完全降下後,記錄用來推壓物件的力量(牛頓為 單位)。 支复JI素(Of) 品質因素依以下測定: 穿透率與壓力降計算品質因素“QF值,,,取NaCl穿透的自 然對數(Ln)依下式計算:
Qf (1/mm H20)=-Ln{NaCl 穿透(%)/100}/壓力降(mm h20)
Qf較高初值代表較佳初始過濾效果。下降的qf值有效對 應出下降過漉效果。 實色jj 一 本發明模鑄過濾元件所用微纖維組合物,係依美國專利 第4,118,531號(Hauser)方法製作之含噴微纖維及熱可結合定長 纖維摻配物製作,示於圖5。組合物片之噴微纖維成份係由 FINA Oil 及 Chemical Co·,Houston,Texas 的聚丙烯與 Mitsui Petvochemical
Industries Ltd· of Tokyo,Japan 的 TPX-DX820 聚-4-甲基-1-戊烯摻配 物製作。另加入 Chimassorb 944FL,Ciba Geigy Corporation,Hawthorne. New York為溶體添加物。噴微纖維成份中各成份重量百分比 為 98% 聚丙烯,1.2% TPX-DX820,及 0.8% Chimassorb 944FL。微 纖維成份基重為98 g/m2,平均幾何纖維直徑為4.4 μιη,依上 述平均幾何纖維直徑測試法測定。 與微纖維片摻配形成組合片之熱結合雙成份定長纖維為 KOSA,Charlotte, North Carolina 之 Τ254 CELBOND 〇 該熱結合定長 纖維線性密度為每絲12丹尼(dpi),長度為38 mm。平均幾何 纖維直徑為33 μιη。定長纖維係直接引入噴微纖維流。片中 86213 -22- 1270403 定長纖維成?分基重約115 g/m2。組合片總基重為214 g/m2。 組合片依Anqadjivand等人之美國專利第5,496,507號所述方 法加濕。片以5 cm/sec速率經過真空縫,去離子水自一對 Teejet 9501 喷嘴(Spraying Systems Co·,of Wheaton,Illinois)在約 620 kPa靜壓力喷到片上,喷嘴位在離真空缝10 cm遠並對正約真 空縫上方7 cm處。片再經倒轉,重複加濕過程使片兩側均 具有去離子水。過量水藉片第三次通過真空縫移除。片再
吊掛於環境下乾燥。 模鑄帶電片方式是將片於一組半圓杯形加熱模具加壓, 模具約55 mm高,體積約310 cm3。熱壓鑄法中,模具上下加 熱到約110°C,而片置於兩模具間。加熱模具封閉留下約 0.508到0.762 mm間隙約15秒。經過時間後,打開模具移出模 麵產品。 以AFT-8130粒子穿透測試模鑄面罩初始穿透率及壓力降。 元件挺度以模鑄物件挺度測試方法測量。測試結果列於表1。 依實例1所述製作模鑄杯狀漉件,唯該雙成份定長纖維改 變,以 70% CELBOND T254 (12 dpf,長度 38 mm)及 30%聚酯定 長纖維,Type 295 (15 dpf,長度38 mm)摻配取代。CELBOND T254定長纖維平均幾何纖維直徑為33 μηι,Type 295平均幾何 纖維直徑為35 μιη,而微纖維平均幾何纖維直徑為4·4 μηι。 定長纖維成份基重為約130 g/m2。組合片總基重為約242 g/m2 。本例中模鑄杯形過濾元件經測試,結果列於表1。 實例3 86213 -23 - l27〇4〇3 依實例1衅述製作模鑄濾件,唯該雙成份定長纖維改變, 以 49% CELBOND T254 (12 dpf,長度 38 mm),21% 聚酯定長纖維 ,Type 295 (15 dpf,長度 38 mm),及7% Insley美國專利第 4,813,946 號之微纖維片摻配取代。CELBOND T254定長纖維平均幾何 纖維直徑為33 μπι,Type 295平均幾何纖維直徑為35 μπι,微纖 維平均幾何纖維直徑為4·4 μπι。本例中所用CHIMASSORB 944FL 為 1.0 wt%,取代例 1所用 TPX-DX820/CHIMASSORB 944FL 組
合。聚丙烯噴微纖維比率提高到99 wt%。組合片内噴微纖 二· · 維成份基重為約52 g/m2,定長纖維為約115 g/m2,而微纖維 微片約Π g/m2。組合片總基重約219 g/m2。例3物件經測試其 壓力降,穿透率及挺度,並定出品質因素如下: 表1 實例編號 壓:力降(mmH2〇) 穿透率(%) 挺度(N) 品質因素Qf 1 7.0 2.6 1.5 0.52 2 6.5 4.2 0.7 0.49 3 8.9 5.1 2.3 0.33
表1所示數據顯示,增加定長纖維可降低壓力降,但仍保 持大於〇·5牛頓的挺度。加入微纖維微片增加壓力降,但同 時提高挺度。 實例4
依例1所述製作微纖維組合片,唯使用45 wt%噴微纖維及 55 wt%熱結合雙成份定長纖維。定長與微纖維平均幾何纖 維直徑各為33與4·4 μιη。此例中不加TPX或CHIMASSORB 944 於微纖維。所得組合片總基重約100 g/m2。片兩面均以WO 86213 -24 - 1270403 00/01737所述内容加以氟化處理。此例用片以PlasmaTherm,St. Petersburg,Florida之2480型平行板電容結合電漿反應器氟化。 ’ 電極間隙在此例中,於PlasmaTherm的15 cm降到1.6 cm。片樣 -本切成20.3 cmX 30.5 cm段,置於反應器充電電極上。關閉反 應器室,泵吸室壓到約1.3 Pa或更低。取3M公司,St. Paul, Minnesota,過氟丙燒C3F8氣體,計量送入室中,流率為83標 準cm3/min,直到室壓為40 Pa。以13.56 MHz電源充電室内電 · 極到1000 Watts,片經處理1分鐘。樣品取出前,先將室抽吸 排放到大氣,轉向後再放回反應器,重複製程,使片兩面 均得到相等處理。 再取處理片充灌模鑄如例1,唯充灌輸送帶速度為10.2 - cm/sec,而水壓為827 kPa。水喷向皮帶上方15 cm處。模鑄片 以NaCl粒子穿透及壓力降測量,結果列於表2。 實例5 依例4所述製作片,唯改變C3F8氟化處理氣體流率到169標 準cm3/min,室壓66.7 Pa,片各面處理時間為30秒。取二層片 組合並模鑄,如例1。所得模鑄片以NaCl粒子穿透及壓力降 , 測量,計算QF值,結果列於表2 : 表2 實例 編號 基重(g/m2) 壓力降 (mm H20) 穿透率(%) NaCl 挺度(N) Qf 4 100 5.5 0.769 … 0.89 5 200 12.7 0.013 0.35 0.70 表2所示數據顯示與例1-3相較,氟化片後,基重減少而 86213 -25- 1270403 得到更佳過k效果。 以上所述專利與專利申請書,包含背景說明所述國際出 版物與文件,均併為本文件參考。 本發明亦可在缺少上述特定敘述内容文件或項目下適當 操作實施。 【圖式簡單說明】 圖1為可成型製作本發明過濾元件不織布片1〇之相片(放 大100倍)。 圖2為已成型製作本發明過滤元件不織布片10,之相片(放 大100倍)。 圖3為本發明過攄面罩16穿戴於人實例之側視圖。 圖4為沿圖3之Φ4線所取剖面圖。 二圖5為可用於形成含定長纖維與微纖維兩者片之 部份剖面圖。 可用於對纖維片10加上電荷之水噴佈裝置透視圖 2形成、本發明面罩體22裝置54部份剖面側視圖。 為沿圖7之8_8線所取之剖面圖 圖9為沿圖7之9_9線所取之剖面圖。 【圖式代表符號說明】 10/10?不織布片 12 定長纖維 13 纖維交又點 14 微纖維 16 面罩 86213 -26- 1270403 18 周邊 20 面罩帶 22 面罩體 24 鼻夬 28 擠出室 29 裝置 30 模具孔 32 氣體孔 34 收集器 36 提起輪 38 片 40 桌台 42 驅動輪 44 管 45 喷灑裝置 46 •支撐裝置 48 噴水 50 喷水頭 52 撞擊點 54 裝置 56 上皮段 58 加熱段 60 冷模鑄段 62 .片表面 86213 -27- 片表面 滾輪 滾輪 烘箱帶 紅外線加熱器 熱風撞擊 圓孔板 鏈輪 皮帶 皮帶~ 模鑄組件 模鑄組件 旋轉輪組 旋轉裝置 旋轉裝置 鏈條 鏈條 -28-

Claims (1)

  1. Ι27(ΜΘ3ΐ 17642號專利申請案 中文申請專利範圍替換本(95年6月)
    拾、申請專利範園: ι· 一種過濾元件,其包含: 具有熱結合定長纖維與非熱結合帶電微纖維之多孔損 禱網片,該多孔模鑄網片之模鑄結構,至少部份是由定 長纖維在纖維交叉點結合而保持。 如申μ專利範圍第1項之過遽元件,其中該多孔模鏵網片 β有、’、勺30到70重里百分比可熱結合定長纖維,且包含约 30到70重量百分比非可熱結合微纖維。 如申μ專利範圍第1項之過遽元件,其中該多孔模鎊網片 所含微纖維重量超過定長纖維。 如申請專利範圍第1項之過遽元件 小於0.3 m。 5 ·如申請專利範圍第1項之過遽元件 幾何纖維直徑約1 5 μιη或更高。 6·如申請專利範圍第1項之過濾元件 數大於約3 g/9000 m。 7·如申請專利範圍第1項之過濾元件 確定長度捲曲聚合纖維。 8. 如申請專利範圍第1項之過濾元件, 9. 如申請專利範圍第1項之過濾元件 分比,基重約50到300 g/m2。 10· —種製作過濾元件之方法,該方法包含: 提供一種預模鑄纖維網片,其包含可熱結合定長顏 2· 3. 4· 其中該定長纖維長/ 其中該定長纖維平j 其中該定長纖維丹^ 其中該定長纖維為^ 其厚度約1到4 mm 〇 ,其固形物約5到30 _ 86213-950607.doc 1270403 及帶電非熱結合微纖維;且 模鑄該纖維網片為所要求形狀,以使可熱結合定長纖 維成為熱結合狀態以於纖維交叉點呈現結合。 86213-950607.doc
TW92117642A 2002-07-25 2003-06-27 Molded filter element that contains thermally bonded staple fibers and electrically-charged microfibers TWI270403B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/205,565 US6827764B2 (en) 2002-07-25 2002-07-25 Molded filter element that contains thermally bonded staple fibers and electrically-charged microfibers

Publications (2)

Publication Number Publication Date
TW200401659A TW200401659A (en) 2004-02-01
TWI270403B true TWI270403B (en) 2007-01-11

Family

ID=30770098

Family Applications (1)

Application Number Title Priority Date Filing Date
TW92117642A TWI270403B (en) 2002-07-25 2003-06-27 Molded filter element that contains thermally bonded staple fibers and electrically-charged microfibers

Country Status (13)

Country Link
US (1) US6827764B2 (zh)
EP (1) EP1551528B1 (zh)
JP (1) JP4902960B2 (zh)
KR (1) KR101094494B1 (zh)
CN (2) CN1302832C (zh)
AT (1) ATE337066T1 (zh)
AU (1) AU2003281777B2 (zh)
BR (1) BR0312829B1 (zh)
CA (1) CA2492207A1 (zh)
DE (1) DE60307870T2 (zh)
MX (1) MXPA05000745A (zh)
TW (1) TWI270403B (zh)
WO (1) WO2004011123A2 (zh)

Families Citing this family (80)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7044993B1 (en) * 2001-10-22 2006-05-16 Bolduc Leroux Inc. Microbicidal air filter
CN101791153A (zh) * 2004-01-13 2010-08-04 黄重德 个人用吸入过滤器
US20050183727A1 (en) * 2004-02-23 2005-08-25 Chou Su J. Mask having anti-virus and anti-germ effect
DE102004035967A1 (de) * 2004-07-23 2006-03-16 Carl Freudenberg Kg Filteranordnung
US7416581B2 (en) * 2004-09-03 2008-08-26 Point Source Solutions, Inc. Air-permeable filtration media, methods of manufacture and methods of use
JP4518906B2 (ja) * 2004-10-20 2010-08-04 花王株式会社 吸収性物品用の表面シート
US7725948B2 (en) * 2004-12-22 2010-06-01 Kimberly-Clark Woldwide, Inc. Face mask with offset folding for improved fluid resistance
BRPI0608836A2 (pt) * 2005-03-07 2016-11-08 3M Innovative Properties Co dispositivo de filtro de ar de compartimento de passageiro de veículo
US7244291B2 (en) * 2005-05-02 2007-07-17 3M Innovative Properties Company Electret article having high fluorosaturation ratio
US7244292B2 (en) * 2005-05-02 2007-07-17 3M Innovative Properties Company Electret article having heteroatoms and low fluorosaturation ratio
US8171933B2 (en) * 2005-08-25 2012-05-08 3M Innovative Properties Company Respirator having preloaded nose clip
US7757811B2 (en) * 2005-10-19 2010-07-20 3M Innovative Properties Company Multilayer articles having acoustical absorbance properties and methods of making and using the same
US7902096B2 (en) * 2006-07-31 2011-03-08 3M Innovative Properties Company Monocomponent monolayer meltblown web and meltblowing apparatus
US9770058B2 (en) 2006-07-17 2017-09-26 3M Innovative Properties Company Flat-fold respirator with monocomponent filtration/stiffening monolayer
US7807591B2 (en) * 2006-07-31 2010-10-05 3M Innovative Properties Company Fibrous web comprising microfibers dispersed among bonded meltspun fibers
US7858163B2 (en) * 2006-07-31 2010-12-28 3M Innovative Properties Company Molded monocomponent monolayer respirator with bimodal monolayer monocomponent media
US7905973B2 (en) * 2006-07-31 2011-03-15 3M Innovative Properties Company Molded monocomponent monolayer respirator
US7670396B2 (en) * 2006-07-27 2010-03-02 Honeywell International Inc. Filter and method of using the same
US8029723B2 (en) * 2006-07-31 2011-10-04 3M Innovative Properties Company Method for making shaped filtration articles
PL2046458T3 (pl) * 2006-07-31 2013-11-29 3M Innovative Properties Co Składana płaska maska oddechowa z jednoskładnikową monowarstwą filtracyjno-usztywniającą
US7754041B2 (en) * 2006-07-31 2010-07-13 3M Innovative Properties Company Pleated filter with bimodal monolayer monocomponent media
AU2007342321B2 (en) 2006-07-31 2010-08-26 3M Innovative Properties Company Method for making shaped filtration articles
US7520923B2 (en) * 2007-03-22 2009-04-21 Mvp Textiles & Apparel, Inc. Antimicrobial filtration article
US8303693B2 (en) * 2007-04-26 2012-11-06 The Hong Kong Polytechnic University Nanofiber filter facemasks and cabin filters
US20080271739A1 (en) 2007-05-03 2008-11-06 3M Innovative Properties Company Maintenance-free respirator that has concave portions on opposing sides of mask top section
US9770611B2 (en) 2007-05-03 2017-09-26 3M Innovative Properties Company Maintenance-free anti-fog respirator
US7989371B2 (en) * 2007-06-22 2011-08-02 3M Innovative Properties Company Meltblown fiber web with staple fibers
US7989372B2 (en) * 2007-06-22 2011-08-02 3M Innovative Properties Company Molded respirator comprising meltblown fiber web with staple fibers
US20080315454A1 (en) * 2007-06-22 2008-12-25 3M Innovative Properties Company Method of making meltblown fiber web with staple fibers
AU2008302603B2 (en) * 2007-09-20 2011-12-22 3M Innovative Properties Company Filtering face-piece respirator having buckles integral to the mask body support structure
US8066148B2 (en) 2008-02-19 2011-11-29 Garahan Patrick J Portable holder for beverage containers
JP2009254418A (ja) * 2008-04-11 2009-11-05 Three M Innovative Properties Co マスク用ノーズクリップ及びマスク
RU2448207C1 (ru) * 2008-06-02 2012-04-20 3М Инновейтив Пропертиз Компани Электретные полотна с усиливающими заряд добавками
DE102008047552A1 (de) * 2008-09-16 2010-04-08 Carl Freudenberg Kg Elektretfilterelement und Verfahren zu dessen Herstellung
DE102008050264A1 (de) * 2008-10-07 2010-04-08 Carl Freudenberg Kg Filterelement mit abscheidungsstabilisierender Beschichtung
ES2676296T3 (es) 2009-09-11 2018-07-18 Breathe Safely Inc. Máscara facial pasiva de filtrado desechable con junta dentro de junta y junta con puente opcional
EP2298096A2 (en) 2009-09-18 2011-03-23 3M Innovative Properties Co. Filtering face respirator having grasping feature indicator
CN102630176A (zh) 2009-11-18 2012-08-08 3M创新有限公司 强化过滤介质
JP5520091B2 (ja) * 2010-03-10 2014-06-11 ユニ・チャーム株式会社 積層体処理装置
US9387420B2 (en) 2010-04-12 2016-07-12 Baker Hughes Incorporated Screen device and downhole screen
CN102240489B (zh) * 2010-05-14 2014-11-26 东丽纤维研究所(中国)有限公司 一种注塑成型滤芯及其用途
CN103025941B (zh) 2010-07-07 2016-08-10 3M创新有限公司 图案化的气纺非织造纤维网及其制备和使用方法
BR112013000010A2 (pt) * 2010-07-07 2016-05-10 3M Innovative Properties Co mantas fibrosas de eletreto não tecido e método para fabricação de uma manta fibrosa de eletreto não tecida
US20120060843A1 (en) * 2010-09-09 2012-03-15 Moldex-Metric, Inc. Pleated filtering face piece respirator
US9017501B2 (en) 2011-02-17 2015-04-28 Baker Hughes Incorporated Polymeric component and method of making
US8684075B2 (en) 2011-02-17 2014-04-01 Baker Hughes Incorporated Sand screen, expandable screen and method of making
US8664318B2 (en) 2011-02-17 2014-03-04 Baker Hughes Incorporated Conformable screen, shape memory structure and method of making the same
US9044914B2 (en) 2011-06-28 2015-06-02 Baker Hughes Incorporated Permeable material compacting method and apparatus
BR112013032643A2 (pt) 2011-06-30 2017-11-07 3M Innovative Properties Co mantas fibrosas de eletreto não tecidas e métodos para fabricação das mesmas
US8720590B2 (en) 2011-08-05 2014-05-13 Baker Hughes Incorporated Permeable material compacting method and apparatus
US8721958B2 (en) 2011-08-05 2014-05-13 Baker Hughes Incorporated Permeable material compacting method and apparatus
US8496088B2 (en) 2011-11-09 2013-07-30 Milliken & Company Acoustic composite
US20130146061A1 (en) * 2011-12-09 2013-06-13 3M Innovative Properties Company Respirator made from in-situ air-laid web(s)
US10245537B2 (en) 2012-05-07 2019-04-02 3M Innovative Properties Company Molded respirator having outer cover web joined to mesh
US9352267B2 (en) * 2012-06-20 2016-05-31 Hollingsworth & Vose Company Absorbent and/or adsorptive filter media
US8900338B2 (en) 2012-08-07 2014-12-02 Honeywell International Inc. Accessory cap for a respiratory filter cartridge
US9186608B2 (en) 2012-09-26 2015-11-17 Milliken & Company Process for forming a high efficiency nanofiber filter
US9149748B2 (en) 2012-11-13 2015-10-06 Hollingsworth & Vose Company Multi-layered filter media
US11090590B2 (en) 2012-11-13 2021-08-17 Hollingsworth & Vose Company Pre-coalescing multi-layered filter media
US9149749B2 (en) 2012-11-13 2015-10-06 Hollingsworth & Vose Company Pre-coalescing multi-layered filter media
EP2931402B1 (en) * 2012-12-14 2017-08-09 3M Innovative Properties Company Non-woven electret fibrous webs and methods of making same
MX346385B (es) 2013-02-14 2017-03-16 Nanopareil Llc Fieltros hibridos de nanofibras electrohiladas.
WO2014168066A1 (ja) * 2013-04-11 2014-10-16 東レ株式会社 混繊不織布およびその製造方法
US10195542B2 (en) 2014-05-15 2019-02-05 Hollingsworth & Vose Company Surface modified filter media
US10399024B2 (en) 2014-05-15 2019-09-03 Hollingsworth & Vose Company Surface modified filter media
US10828587B2 (en) 2015-04-17 2020-11-10 Hollingsworth & Vose Company Stable filter media including nanofibers
GB201508114D0 (en) 2015-05-12 2015-06-24 3M Innovative Properties Co Respirator tab
KR101855683B1 (ko) * 2015-06-01 2018-05-09 주식회사 아모그린텍 흡착 멤브레인이 내장된 마스크
US11918948B2 (en) 2015-06-09 2024-03-05 Cummins Filtration Ip, Inc. Systems and methods for rotating coalescers maintaining positive recirculation through a dynamic seal
US10974182B2 (en) * 2015-08-21 2021-04-13 Cummins Filtration Ip, Inc. High speed rotating crankcase ventilation filter media and media pack
DE112016003302T5 (de) 2015-08-28 2018-05-24 Cummins Filtration Ip, Inc. Rotierendes Koaleszerelement mit gerichteter Flüssigkeitsdrainage und gerichtetem Gasauslass
US10711669B2 (en) 2016-04-28 2020-07-14 Cummins Filtration Ip, Inc. Inside-out rotating coalescer with gas exit through hollow shaft
US10625196B2 (en) 2016-05-31 2020-04-21 Hollingsworth & Vose Company Coalescing filter media
US11638544B2 (en) * 2017-05-17 2023-05-02 Radiometer Medical Aps Porous optical fiber for the detection of an analyte in a fluid
JP7186213B2 (ja) 2017-07-14 2022-12-08 スリーエム イノベイティブ プロパティズ カンパニー 複数の液体ストリームを搬送するためのアダプタ
US11285421B2 (en) * 2018-04-12 2022-03-29 Electrolux Home Products, Inc. Filter media for filtration of cooking fumes
BR112021020488A2 (pt) 2019-05-01 2022-02-15 Ascend Performance Mat Operations Llc Meio filtrante compreendendo camada de nanofibra de poliamida
DE102020124442A1 (de) 2020-09-18 2022-03-24 Wolf Pvg Gmbh & Co. Kommanditgesellschaft Verfahren zur Herstellung von Atemschutzmasken unter Verwendung von recycliertem Fasermaterial, sowie Atemschutzmasken
USD941989S1 (en) 2020-09-25 2022-01-25 Huhtamaki, Inc. Respiratory mask
DE102021103701A1 (de) * 2021-02-17 2022-08-18 Carl Freudenberg Kg Verwendung eines Verbundmaterials als Verpackungsmaterial, insbesondere für sterile Verpackungsanwendungen

Family Cites Families (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3016599A (en) * 1954-06-01 1962-01-16 Du Pont Microfiber and staple fiber batt
US3644605A (en) * 1969-02-11 1972-02-22 Bell Telephone Labor Inc Method for producing permanent electret charges in dielectric materials
NL160303C (nl) * 1974-03-25 1979-10-15 Verto Nv Werkwijze voor het vervaardigen van een vezelfilter.
CA1073648A (en) * 1976-08-02 1980-03-18 Edward R. Hauser Web of blended microfibers and crimped bulking fibers
NL181632C (nl) 1976-12-23 1987-10-01 Minnesota Mining & Mfg Electreetfilter en werkwijze voor het vervaardigen daarvan.
US4215682A (en) 1978-02-06 1980-08-05 Minnesota Mining And Manufacturing Company Melt-blown fibrous electrets
US4850347A (en) 1980-06-09 1989-07-25 Metric Products, Inc. Face mask
AU565762B2 (en) 1983-02-04 1987-09-24 Minnesota Mining And Manufacturing Company Method and apparatus for manufacturing an electret filter medium
US4795668A (en) 1983-10-11 1989-01-03 Minnesota Mining And Manufacturing Company Bicomponent fibers and webs made therefrom
US4729371A (en) 1983-10-11 1988-03-08 Minnesota Mining And Manufacturing Company Respirator comprised of blown bicomponent fibers
US4547420A (en) 1983-10-11 1985-10-15 Minnesota Mining And Manufacturing Company Bicomponent fibers and webs made therefrom
US4536440A (en) 1984-03-27 1985-08-20 Minnesota Mining And Manufacturing Company Molded fibrous filtration products
US4807619A (en) 1986-04-07 1989-02-28 Minnesota Mining And Manufacturing Company Resilient shape-retaining fibrous filtration face mask
GB8612070D0 (en) 1986-05-19 1986-06-25 Brown R C Blended-fibre filter material
US4988560A (en) 1987-12-21 1991-01-29 Minnesota Mining And Manufacturing Company Oriented melt-blown fibers, processes for making such fibers, and webs made from such fibers
US4874399A (en) 1988-01-25 1989-10-17 Minnesota Mining And Manufacturing Company Electret filter made of fibers containing polypropylene and poly(4-methyl-1-pentene)
JPH0633571B2 (ja) * 1988-10-11 1994-05-02 東レ株式会社 エレクトレット不織布の製造方法
CA2027687C (en) 1989-11-14 2002-12-31 Douglas C. Sundet Filtration media and method of manufacture
US5307796A (en) * 1990-12-20 1994-05-03 Minnesota Mining And Manufacturing Company Methods of forming fibrous filtration face masks
US5227172A (en) 1991-05-14 1993-07-13 Exxon Chemical Patents Inc. Charged collector apparatus for the production of meltblown electrets
JPH05279947A (ja) * 1992-03-25 1993-10-26 Kuraray Co Ltd ポリカーボネート極細繊維不織布
US5753343A (en) * 1992-08-04 1998-05-19 Minnesota Mining And Manufacturing Company Corrugated nonwoven webs of polymeric microfiber
US5419953A (en) * 1993-05-20 1995-05-30 Chapman; Rick L. Multilayer composite air filtration media
US5643507A (en) * 1993-08-17 1997-07-01 Minnesota Mining And Manufacturing Company Filter media having an undulated surface
EP0845554B1 (en) * 1993-08-17 2009-11-18 Minnesota Mining And Manufacturing Company Method of charging electret filter media
US5607491A (en) * 1994-05-04 1997-03-04 Jackson; Fred L. Air filtration media
JP3435867B2 (ja) * 1994-06-20 2003-08-11 チッソ株式会社 不織布成型物及びその製造法
CZ294743B6 (cs) * 1995-03-09 2005-03-16 Minnesota Mining And Manufacturing Company Osobní respirační ochranné zařízení a způsob jeho výroby
US5841081A (en) * 1995-06-23 1998-11-24 Minnesota Mining And Manufacturing Company Method of attenuating sound, and acoustical insulation therefor
JPH0929021A (ja) * 1995-07-21 1997-02-04 Chisso Corp フィルター
US5908598A (en) * 1995-08-14 1999-06-01 Minnesota Mining And Manufacturing Company Fibrous webs having enhanced electret properties
US5817584A (en) * 1995-12-22 1998-10-06 Kimberly-Clark Worldwide, Inc. High efficiency breathing mask fabrics
US5898981A (en) * 1996-04-30 1999-05-04 Minnesota Mining & Manufacturing Company Synthetic filter media and method for manufacturing same
US5891482A (en) * 1996-07-08 1999-04-06 Aaf International Melt blowing apparatus for producing a layered filter media web product
JPH10108915A (ja) * 1996-10-03 1998-04-28 Hitachi Chem Co Ltd 脱臭マスク
WO1998040206A1 (en) * 1997-03-11 1998-09-17 The University Of Tennessee Research Corporation Meltblown composites and uses thereof
JP3657406B2 (ja) * 1997-09-30 2005-06-08 日本バイリーン株式会社 濾材
US6432175B1 (en) 1998-07-02 2002-08-13 3M Innovative Properties Company Fluorinated electret
JP4369572B2 (ja) * 1998-11-17 2009-11-25 日本バイリーン株式会社 不織布及びそれを用いた濾過材
US6270709B1 (en) * 1998-12-15 2001-08-07 E. I. Du Pont De Nemours And Company Flash spinning polymethylpentene process and product
US6427693B1 (en) * 2000-05-01 2002-08-06 Kimberly-Clark Worldwide, Inc. Face mask structure
JP2001347117A (ja) * 2000-06-09 2001-12-18 Toyobo Co Ltd 濾 材

Also Published As

Publication number Publication date
BR0312829A (pt) 2005-04-19
CN1954993A (zh) 2007-05-02
JP4902960B2 (ja) 2012-03-21
DE60307870T2 (de) 2007-03-15
CA2492207A1 (en) 2004-02-05
TW200401659A (en) 2004-02-01
WO2004011123A2 (en) 2004-02-05
EP1551528B1 (en) 2006-08-23
DE60307870D1 (de) 2006-10-05
CN1302832C (zh) 2007-03-07
JP2005533644A (ja) 2005-11-10
WO2004011123A3 (en) 2004-05-13
AU2003281777A1 (en) 2004-02-16
EP1551528A2 (en) 2005-07-13
AU2003281777B2 (en) 2008-10-02
CN1671457A (zh) 2005-09-21
US20040016345A1 (en) 2004-01-29
KR20050025653A (ko) 2005-03-14
KR101094494B1 (ko) 2011-12-19
BR0312829B1 (pt) 2012-06-26
MXPA05000745A (es) 2005-04-28
ATE337066T1 (de) 2006-09-15
US6827764B2 (en) 2004-12-07
CN1954993B (zh) 2012-03-07

Similar Documents

Publication Publication Date Title
TWI270403B (en) Molded filter element that contains thermally bonded staple fibers and electrically-charged microfibers
US7989372B2 (en) Molded respirator comprising meltblown fiber web with staple fibers
EP2167714B1 (en) Meltblown fiber web with staple fibers
US20080315454A1 (en) Method of making meltblown fiber web with staple fibers
KR101009201B1 (ko) 내분쇄성 여과 안면 마스크
TW510814B (en) Filter and respirator comprising the same, and method of removing particulate solid or liquid aerosol from gas
KR101869568B1 (ko) 마스크 본체 내에 팽창 메시를 갖는 안면부 여과식 호흡기
KR20120087174A (ko) 보강된 필터 매체
WO2008076472A2 (en) Molded monocomponent monolayer respirator

Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees