EP0469498A2 - Particle filtering halfmask - Google Patents

Particle filtering halfmask Download PDF

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Publication number
EP0469498A2
EP0469498A2 EP91112681A EP91112681A EP0469498A2 EP 0469498 A2 EP0469498 A2 EP 0469498A2 EP 91112681 A EP91112681 A EP 91112681A EP 91112681 A EP91112681 A EP 91112681A EP 0469498 A2 EP0469498 A2 EP 0469498A2
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EP
European Patent Office
Prior art keywords
folds
filter layer
layer
half mask
filter
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP91112681A
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German (de)
French (fr)
Other versions
EP0469498A3 (en
Inventor
Hubert Bullach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell Safety Products Sweden AB
Original Assignee
Bilsom AB
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 Bilsom AB filed Critical Bilsom AB
Publication of EP0469498A2 publication Critical patent/EP0469498A2/en
Publication of EP0469498A3 publication Critical patent/EP0469498A3/en
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00—Filters for breathing-protection purposes
    • A62B23/02—Filters for breathing-protection purposes for respirators
    • A62B23/025—Filters for breathing-protection purposes for respirators the filter having substantially the shape of a mask

Definitions

  • the invention relates to a particle-filtering half mask, the shell-shaped domed mask body of which consists at least partially of filter material, with a central filter layer made of porous, flexible filter material which is accommodated between an outer and inner porous cover layer.
  • Filtering half masks only enclose the user's mouth and nose.
  • the inhaled air flows through the mask body which essentially forms the filter and is curved in the form of a bowl.
  • These particle filtering half masks are often used as disposable dust filter masks. They are described in the DIN 58645 standard.
  • the filter fineness i.e. The pore size of the filter material used is determined by the particle size of the air contaminants to be filtered out.
  • the flow resistance that occurs which is particularly noticeable to the user as an inhalation resistance and therefore must not exceed predetermined values, depends directly on the pore size of the filter material and on the available passage area, i.e. the filter area. Therefore, when using very fine-pored filter material, the largest possible filter area must be provided in order to compensate for the increase in flow resistance.
  • the filter area is predetermined by the size of the mask body, which cannot be increased significantly.
  • pleated filters are used in the case of particle-filtering half masks of another type with a separate filter housing and exchangeable filter insert.
  • the pleats of these filters are essentially perpendicular to the filter surface, i.e. parallel to the flow direction.
  • the height of the folds determines the thickness of the filter insert and thus also the depth of the filter housing that is attached to the front of the half mask.
  • the object of the invention is therefore to design a particle-filtering half mask of the type mentioned in such a way that a significant increase in the effective filter area is achieved without substantially increasing the outer dimensions of the half mask.
  • the effective filter area can be increased considerably without significantly increasing the dimensions of the half mask. Only the thickness, i.e. the distance between the two top layers is slightly larger than with a conventional half mask with an unfolded middle filter layer.
  • the middle filter layer can be placed in pleated folds, which are arranged, for example, in the form of scales.
  • the production is relatively simple because the filter material, which is initially in flat form, can be folded; a spatially curved shell is then produced from this pleated filter layer in one molding process.
  • a plurality of folds are secured by a jointly glued-on holding strip which extends transversely to the direction of the folds, thereby facilitating the molding process.
  • the particle-filtering half mask shown in FIG. 1 has a mask body 1, which essentially forms the filter.
  • the mask body 1 consists of an outer porous cover layer 2 (FIG. 2), an inner porous cover layer 3 and an intermediate filter layer 4, which is made, for example, of a multi-layer nonwoven fabric.
  • the cover layers 2, 3 and the filter layer are connected to one another at a mask edge 5, for example welded or glued.
  • An exhalation valve 6 is arranged approximately in the middle of the mask body 1, through which the exhaled air flows out without flowing through the filter again.
  • Retaining straps 7, which are only hinted at in Fig. 1, serve to hold the half mask on the head of the user so that the edge 5 lies as close as possible to the face.
  • a metallic nose bridge 8 is used to shape the half mask in the nose area.
  • a sealing lip 9 extends from the edge 5 Inside.
  • the middle filter layer 4 consisting of multi-layer filter fleece is pleated like several folds 11 which run approximately horizontally. Instead, the folds 11 can also run vertically or in any other direction. The folds 11 lie flat between the two cover layers 2 and 3.
  • the middle filter layer 4 is folded in a scale-like manner; each fold 11 extending over the entire width of the mask body 1 borders on the next fold 11, as can be seen particularly clearly in the illustration according to FIG. 3. There, the middle filter layer 4 is shown separately in a vertical section.
  • the middle filter layer 4 consists of multi-layer filter material, the layers of which are folded together on top of one another, which cannot be seen in the drawing. Modifications of the folding of the middle filter layer 4 are shown in FIGS. 4, 5 and 6, but this selection is not exhaustive.
  • the folds 11 in the embodiment according to FIG. 4 are meandering in vertical section; the folds 11 run alternately on the inside and the outside.
  • the folds 11 adjoin each other in the embodiments according to FIGS. 3 and 4, it is shown in FIG. 5 that the folds 11 can also overlap to a greater extent. This results in a particularly large increase in the effective filter area.
  • FIG. 6 shows an embodiment in which the folds 11 of the middle filter layer 4 in the upper half of the mask body 1 are directed downwards in a scale-like manner, while in the lower half they are directed upwards in a scale-like manner.
  • a common holding strip 12 which extends perpendicularly (i.e. transverse to the direction of the folds), is glued onto several folds 11.
  • the holding strip 12 serves to secure the folds 11 lying flat after the folding process. This facilitates the subsequent molding process, in which the curved shape is created.

Abstract

A particle-filtering halfmask has a mask body (1), which is curved in the shape of a shell, with a central filter layer (4) made of porous flexible filter material which is received between an outer and an inner porous cover layer. The central filter layer (4) is placed in folds (11) which lie essentially flat between the outer and the inner porous cover layer (2 and 3 respectively). The scale-like folds (11) of the central filter layer (4) run horizontally. <IMAGE>

Description

Die Erfindung betrifft eine partikelfiltrierende Halbmaske, deren schalenförmig gewölbter Maskenkörper mindestens teilweise aus Filtermaterial besteht, mit einer mittleren Filterschicht aus porösem, flexiblem Filtermaterial, das zwischen einer äußeren und inneren porösen Decklage aufgenommen ist.The invention relates to a particle-filtering half mask, the shell-shaped domed mask body of which consists at least partially of filter material, with a central filter layer made of porous, flexible filter material which is accommodated between an outer and inner porous cover layer.

Filtrierende Halbmasken umschließen nur den Mund und die Nase des Benutzers. Die eingeatmete Luft strömt durch den im wesentlichen das Filter bildenden Maskenkörper, der schalenförmig gewölbt ist. Diese partikelfiltrierenden Halbmasken werden häufig als Einweg-Staubfiltermasken verwendet. Sie sind in der Norm DIN 58645 beschrieben.Filtering half masks only enclose the user's mouth and nose. The inhaled air flows through the mask body which essentially forms the filter and is curved in the form of a bowl. These particle filtering half masks are often used as disposable dust filter masks. They are described in the DIN 58645 standard.

Die Filterfeinheit, d.h. die Porengröße des verwendeten Filtermaterials, wird durch die Partikelgröße der auszufiltrierenden Luftverunreinigungen bestimmt. Der auftretende Strömungswiderstand, der sich insbesondere als Einatemwiderstand für den Benutzer bemerkbar macht und deshalb vorgegebene Werte nicht überschreiten darf, hängt unmittelbar von der Porengröße des Filtermaterials und von der zur Verfügung stehenden Durchtrittsfläche, d.h. der Filterfläche ab. Deshalb muß bei Verwendung sehr feinporigen Filtermaterials für eine möglichst große Filterfläche gesorgt werden, um die Erhöhung des Strömungswiderstands auszugleichen.The filter fineness, i.e. The pore size of the filter material used is determined by the particle size of the air contaminants to be filtered out. The flow resistance that occurs, which is particularly noticeable to the user as an inhalation resistance and therefore must not exceed predetermined values, depends directly on the pore size of the filter material and on the available passage area, i.e. the filter area. Therefore, when using very fine-pored filter material, the largest possible filter area must be provided in order to compensate for the increase in flow resistance.

Bei Halbmasken der eingangs genannten Gattung, bei denen der Maskenkörper selbst im wesentlichen das Filter bildet, ist die Filterfläche durch die Größe des Maskenkörpers vorgegeben, die nicht wesentlich gesteigert werden kann.In the case of half masks of the type mentioned at the beginning, in which the mask body itself essentially forms the filter, the filter area is predetermined by the size of the mask body, which cannot be increased significantly.

Um eine Vergrößerung der Filterflache zu erreichen, werden bei partikelfiltrierenden Halbmasken einer anderen Gattung mit gesondertem Filtergehäuse und auswechselbarem Filtereinsatz gefaltete Filter verwendet. Die Falten dieser Filter stehen im wesentlichen senkrecht zur Filterfläche, d.h. parallel zur Durchströmrichtung. Die Höhe der Falten bestimmt dabei die Dicke des Filtereinsatzes und somit auch die Tiefe des Filtergehäuses, das an der Vorderseite der Halbmaske angebracht ist. Eine solche Bauweise ist jedoch bei partikelfiltrierenden Halbmasken der eingangs genannten Gattung schon aus räumlichen Gründen ausgeschlossen, bei denen der Maskenkörper selbst das Filter bildet.To achieve an enlargement of the filter area, pleated filters are used in the case of particle-filtering half masks of another type with a separate filter housing and exchangeable filter insert. The pleats of these filters are essentially perpendicular to the filter surface, i.e. parallel to the flow direction. The height of the folds determines the thickness of the filter insert and thus also the depth of the filter housing that is attached to the front of the half mask. Such a construction is, however, already ruled out for particle-filtering half masks of the type mentioned at the outset for spatial reasons in which the mask body itself forms the filter.

Aufgabe der Erfindung ist es daher, eine partikelfiltrierende Halbmaske der eingangs genannten Gattung so auszubilden, daß ohne wesentlichen Erhöhung der äußeren Abmessungen der Halbmaske eine erhebliche Vergrößerung der wirksamen Filterfläche erreicht wird.The object of the invention is therefore to design a particle-filtering half mask of the type mentioned in such a way that a significant increase in the effective filter area is achieved without substantially increasing the outer dimensions of the half mask.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die mittlere Filterschicht in Falten gelegt ist, die im wesentlichen flach zwischen der äußeren und der inneren porösen Decklage liegen.This object is achieved in that the middle filter layer is placed in folds which lie essentially flat between the outer and the inner porous cover layer.

Dadurch kann eine erhebliche Vergrößerung der wirksamen Filterfläche erreicht werden, ohne daß sich die Abmessungen der Halbmaske wesentlich erhöhen. Lediglich die Dicke, d.h. der Abstand zwischen den beiden Decklagen, ist etwas größer als bei einer herkömmlichen Halbmaske mit ungefalteter mittlerer Filterschicht.As a result, the effective filter area can be increased considerably without significantly increasing the dimensions of the half mask. Only the thickness, i.e. the distance between the two top layers is slightly larger than with a conventional half mask with an unfolded middle filter layer.

Die mittlere Filterschicht kann dabei in Plisseefalten gelegt sein, die beispielsweise schuppenartig angeordnet sind. Die Herstellung ist verhältnismäßig einfach, weil das zunächst in ebener Form vorliegende Filtermaterial in Falten gelegt werden kann; anschließend wird aus dieser in Falten liegenden Filterschicht in einem Formvorgang eine räumlich gewölbte Schale hergestellt.The middle filter layer can be placed in pleated folds, which are arranged, for example, in the form of scales. The production is relatively simple because the filter material, which is initially in flat form, can be folded; a spatially curved shell is then produced from this pleated filter layer in one molding process.

Zweckmäßigerweise sind mehrere Falten durch einen gemeinsamen aufgeklebten, quer zur Faltenrichtung verlaufenden Haltestreifen gesichert, wodurch der Formvorgang erleichtert wird.Expediently, a plurality of folds are secured by a jointly glued-on holding strip which extends transversely to the direction of the folds, thereby facilitating the molding process.

Vorteilhafte Ausgestaltungen des Erfindungsgedankens sind Gegenstand weiterer Unteransprüche.Advantageous embodiments of the inventive concept are the subject of further dependent claims.

Nachfolgend werden Ausführungsbeispiele der Erfindung näher erläutert, die in der Zeichnung dargestellt sind. Es zeigt:

  • Fig. 1 eine Vorderansicht einer dem Atemschutz dienenden partikelfiltrierenden Halbmaske, wobei Teile der äußeren Decklage weggelassen sind,
  • Fig. 2 einen Schnitt längs der Linie 11 - 11 in Fig. 1,
  • Fig. 3 einen Schnitt längs der Linie 111 - 111 durch die mittlere Filterschicht in Fig. 1 und
  • Fig. 4 - 6 in Darstellung entsprechend der Fig. 3 weitere Ausführungsvarianten der mittleren Filterschicht.
Exemplary embodiments of the invention are illustrated below, which are shown in the drawing. It shows:
  • 1 is a front view of a particle-filtering half mask used for respiratory protection, parts of the outer cover layer being omitted,
  • 2 shows a section along the line 11-11 in FIG. 1,
  • Fig. 3 shows a section along the line 111-111 through the middle filter layer in Fig. 1 and
  • 4 - 6 in representation corresponding to FIG. 3 further design variants of the middle filter layer.

Die in Fig. 1 dargestellte partikelfiltrierende Halbmaske weist einen Maskenkörper 1 auf, der im wesentlichen das Filter bildet.The particle-filtering half mask shown in FIG. 1 has a mask body 1, which essentially forms the filter.

Der Maskenkörper 1 besteht aus einer äußeren porösen Decklage 2 (Fig.2), einer inneren porösen Decklage 3 und einer dazwischen angeordneten mittleren Filterschicht 4, die beispielsweise aus einem mehrlagigen Faservlies hergestellt ist.The mask body 1 consists of an outer porous cover layer 2 (FIG. 2), an inner porous cover layer 3 and an intermediate filter layer 4, which is made, for example, of a multi-layer nonwoven fabric.

Die Decklagen 2, 3 und die Filterschicht sind an einem Maskenrand 5 miteinander verbunden, beispielsweise verschweißt oder verklebt. Angenähert in der Mitte des Maskenkörpers 1 ist ein Ausatemventil 6 angeordnet, durch das die ausgeatmete Luft ausströmt, ohne erneut durch das Filter zu strömen.The cover layers 2, 3 and the filter layer are connected to one another at a mask edge 5, for example welded or glued. An exhalation valve 6 is arranged approximately in the middle of the mask body 1, through which the exhaled air flows out without flowing through the filter again.

Haltebänder 7, die in Fig. 1 nur angedeutet sind, dienen dazu, die Halbmaske am Kopf des Benutzers so festzuhalten, daß der Rand 5 weitestgehend dicht am Gesicht anliegt.Retaining straps 7, which are only hinted at in Fig. 1, serve to hold the half mask on the head of the user so that the edge 5 lies as close as possible to the face.

Eine metallische Nasenbrücke 8 dient der Formgebung der Halbmaske im Nasenbereich. Vom Rand 5 erstreckt sich eine Dichtlippe 9 nach innen.A metallic nose bridge 8 is used to shape the half mask in the nose area. A sealing lip 9 extends from the edge 5 Inside.

Die aus mehrlagigem Filtervlies bestehende mittlere Filterschicht 4 ist plisseeartig in mehrere Falten 11 gelegt, die angenähert horizontal verlaufen. Stattdessen können die Falten 11 auch vertikal oder in beliebiger anderer Richtung verlaufen. Die Falten 11 liegen flach zwischen den beiden Decklagen 2 und 3.The middle filter layer 4 consisting of multi-layer filter fleece is pleated like several folds 11 which run approximately horizontally. Instead, the folds 11 can also run vertically or in any other direction. The folds 11 lie flat between the two cover layers 2 and 3.

Bei dem in den Figuren 1 und 2 dargestellten Ausführungsbeispiel ist die mittlere Filterschicht 4 schuppenartig gefaltet; jede sich über die gesamte Breite des Maskenkörpers 1 erstreckende Falte 11 grenzt an die nächste Falte 11, wie besonders deutlich in der Darstellung nach Fig. 3 zu erkennen ist. Dort ist die mittlere Filterschicht 4 gesondert in einem senkrechten Schnitt dargestellt.In the embodiment shown in FIGS. 1 and 2, the middle filter layer 4 is folded in a scale-like manner; each fold 11 extending over the entire width of the mask body 1 borders on the next fold 11, as can be seen particularly clearly in the illustration according to FIG. 3. There, the middle filter layer 4 is shown separately in a vertical section.

Ergänzend ist anzumerken, daß die mittlere Filterschicht 4 aus mehrlagigem Filtermaterial besteht, dessen Lagen aufeinanderliegend gemeinsam gefaltet sind, was in der Zeichnung nicht zu erkennen ist. Abwandlungen der Faltung der mittleren Filterschicht 4 sind in den Figuren 4, 5 und 6 dargestellt, wobei diese Auswahl jedoch nicht abschließend ist.In addition, it should be noted that the middle filter layer 4 consists of multi-layer filter material, the layers of which are folded together on top of one another, which cannot be seen in the drawing. Modifications of the folding of the middle filter layer 4 are shown in FIGS. 4, 5 and 6, but this selection is not exhaustive.

Im Unterschied zu der gleichmäßig schuppenförmigen Anordnung der Falten 11 nach Fig. 3 sind die Falten 11 bei der Ausführung nach Fig. 4 im senkrechten Schnitt mäanderförmig gestaltet; die Falten 11 verlaufen abwechselnd an der Innenseite und der Außenseite.In contrast to the uniformly scale-like arrangement of the folds 11 according to FIG. 3, the folds 11 in the embodiment according to FIG. 4 are meandering in vertical section; the folds 11 run alternately on the inside and the outside.

Während die Falten 11 bei den Ausführungen nach den Figuren 3 und 4 jeweils aneinandergrenzen, ist in Fig. 5 gezeigt, daß sich die Falten 11 auch stärker überlappen können. Dadurch wird eine besonders starke Vergrößerung der wirksamen Filterfläche erzielt.While the folds 11 adjoin each other in the embodiments according to FIGS. 3 and 4, it is shown in FIG. 5 that the folds 11 can also overlap to a greater extent. This results in a particularly large increase in the effective filter area.

Fig. 6 zeigt eine Ausführungsform, bei der die Falten 11 der mittleren Filterschicht 4 in der oberen Hälfte des Maskenkörpers 1 schuppenartig nach unten gerichtet sind, während sie in der unteren Hälfte schuppenartig nach oben gerichtet sind.FIG. 6 shows an embodiment in which the folds 11 of the middle filter layer 4 in the upper half of the mask body 1 are directed downwards in a scale-like manner, while in the lower half they are directed upwards in a scale-like manner.

Es versteht sich, daß weitere Abwandlungen und insbesondere auch Kombinationen der dargestellten Faltenanordnungen möglich sind. Beispielsweise können auch die Faltungen nach den Figuren 4 und 6 mit größerer Überlappung entsprechend der Fig. 5 hergestellt werden.It goes without saying that further modifications and in particular combinations of the fold arrangements shown are possible. For example, the folds according to FIGS. 4 and 6 can also be produced with a larger overlap corresponding to FIG. 5.

Wie in den Figuren 1 und 2 im unteren Bereich der Halbmaske dargestellt, ist auf mehrere Falten 11 ein gemeinsamer, sich senkrecht (d.h. quer zur Faltenrichtung) erstreckender Haltestreifen 12 aufgeklebt. Der Haltestreifen 12 dient dazu, die Falten 11 nach dem Faltvorgang flachliegend zu sichern. Dadurch wird der anschließende Formvorgang erleichtert, bei dem die gewölbte Form entsteht.As shown in FIGS. 1 and 2 in the lower region of the half mask, a common holding strip 12, which extends perpendicularly (i.e. transverse to the direction of the folds), is glued onto several folds 11. The holding strip 12 serves to secure the folds 11 lying flat after the folding process. This facilitates the subsequent molding process, in which the curved shape is created.

Claims (7)

1. Partikelfiltrierende Halbmaske, deren schalenförmig gewölbter Maskenkörper mindestens teilweise aus Filtermaterial besteht, mit einer mittleren Filterschicht aus porösem, flexiblen Filtermaterial, das zwischen einer äußeren und einer inneren porösen Decklage aufgenommen ist, dadurch gekennzeichnet, daß die mittlere Filterschicht (4) in Falten (11) gelegt ist, die im wesentlichen flach zwischen der äußeren und der inneren porösen Decklage (2 bzw.3) liegen.1. Particulate filtering half mask, the shell-shaped domed mask body of which consists at least partially of filter material, with a central filter layer made of porous, flexible filter material, which is accommodated between an outer and an inner porous cover layer, characterized in that the central filter layer (4) in folds ( 11), which lie essentially flat between the outer and inner porous cover layers (2 and 3). 2. Halbmaske nach Anspruch 1, dadurch gekennzeichnet, daß die mittlere Filterschicht (4) schuppenartig gefaltet ist.2. Half mask according to claim 1, characterized in that the middle filter layer (4) is folded like a scale. 3. Halbmaske nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Falten (11) der mittleren Filterschicht (4) angenähert horizontal verlaufen.3. Half mask according to claim 1 or 2, characterized in that the folds (11) of the middle filter layer (4) run approximately horizontally. 4. Halbmaske nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß die einzelnen Falten (11) der mittleren Filterschicht (4) aneinandergrenzen.4. Half mask according to one of claims 1-3, characterized in that the individual folds (11) of the middle filter layer (4) adjoin each other. 5. Halbmaske nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß die Falten (11) der mittleren Filterschicht (4) einander überlappen.5. Half mask according to one of claims 1-3, characterized in that the folds (11) of the middle filter layer (4) overlap one another. 6. Halbmaske nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, daß die mittlere Filterschicht (4) aus mehrlagigem Filtermaterial besteht, dessen Lagen aufeinanderliegend gemeinsam gefaltet sind.6. Half mask according to one of claims 1-5, characterized in that the middle filter layer (4) consists of multi-layer filter material, the layers of which are folded together on top of one another. 7. Halbmaske nach einem der Ansprüche 1 - 6, dadurch gekennzeichnet, daß auf mehreren Falten (11) ein gemeinsamer, quer zur Faltenrichtung verlaufender Haltestreifen (12) aufgeklebt ist.7. Half mask according to one of claims 1-6, characterized in that on several folds (11) a common, transverse to the fold direction holding strip (12) is glued.
EP19910112681 1990-07-28 1991-07-27 Particle filtering halfmask Withdrawn EP0469498A3 (en)

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Application Number Priority Date Filing Date Title
DE9011154U DE9011154U1 (en) 1990-07-28 1990-07-28
DE9011154U 1990-07-28

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EP0469498A2 true EP0469498A2 (en) 1992-02-05
EP0469498A3 EP0469498A3 (en) 1992-04-22

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5656368A (en) * 1992-08-04 1997-08-12 Minnesota Mining And Manufacturing Company Fibrous filtration face mask having corrugated polymeric microfiber filter layer
WO1999024119A1 (en) * 1997-11-11 1999-05-20 Minnesota Mining And Manufacturing Company Respiratory masks having valves and other components attached to the mask by a printed patch of adhesive
EP1243291A1 (en) * 2001-03-23 2002-09-25 Shigematsu Works Co., Ltd. A filter and a disposable dustproof mask with use of said filter
EP1366784A1 (en) * 2002-05-28 2003-12-03 Lee Bookyung Health mask
EP3066943A4 (en) * 2013-11-07 2017-12-13 Lin, Jing-Jyr Filtration structure
CN108652106A (en) * 2017-03-29 2018-10-16 姜嘉怡 It is folded over the mask of filtering layer

Citations (5)

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Publication number Priority date Publication date Assignee Title
GB442725A (en) * 1934-07-10 1936-02-10 John Ambrose Sadd Major Improvements in respirators
US2201315A (en) * 1936-11-13 1940-05-21 American Optical Corp Respirator
US3049121A (en) * 1959-01-20 1962-08-14 Richard S Brumfield Oronasal mask
WO1981001019A1 (en) * 1979-10-09 1981-04-16 L Giffard Respiratory mask and filtering material included therein
GB2059782A (en) * 1979-09-25 1981-04-29 Draegerwerk Ag A breathing half-mask for once only use

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB442725A (en) * 1934-07-10 1936-02-10 John Ambrose Sadd Major Improvements in respirators
US2201315A (en) * 1936-11-13 1940-05-21 American Optical Corp Respirator
US3049121A (en) * 1959-01-20 1962-08-14 Richard S Brumfield Oronasal mask
GB2059782A (en) * 1979-09-25 1981-04-29 Draegerwerk Ag A breathing half-mask for once only use
WO1981001019A1 (en) * 1979-10-09 1981-04-16 L Giffard Respiratory mask and filtering material included therein

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5656368A (en) * 1992-08-04 1997-08-12 Minnesota Mining And Manufacturing Company Fibrous filtration face mask having corrugated polymeric microfiber filter layer
US5753343A (en) * 1992-08-04 1998-05-19 Minnesota Mining And Manufacturing Company Corrugated nonwoven webs of polymeric microfiber
US5763078A (en) * 1992-08-04 1998-06-09 Minnesota Mining And Manufacturing Company Filter having corrugated nonwoven webs of polymeric microfiber
US5804295A (en) * 1992-08-04 1998-09-08 Minnesota Mining And Manufacturing Company Fibrous filtration face mask having corrugated polymeric microfiber filter layer
WO1999024119A1 (en) * 1997-11-11 1999-05-20 Minnesota Mining And Manufacturing Company Respiratory masks having valves and other components attached to the mask by a printed patch of adhesive
US6125849A (en) * 1997-11-11 2000-10-03 3M Innovative Properties Company Respiratory masks having valves and other components attached to the mask by a printed patch of adhesive
EP1243291A1 (en) * 2001-03-23 2002-09-25 Shigematsu Works Co., Ltd. A filter and a disposable dustproof mask with use of said filter
EP1366784A1 (en) * 2002-05-28 2003-12-03 Lee Bookyung Health mask
US6772759B2 (en) 2002-05-28 2004-08-10 Bookyung Lee Health mask with channelized breath passageways
EP3066943A4 (en) * 2013-11-07 2017-12-13 Lin, Jing-Jyr Filtration structure
CN108652106A (en) * 2017-03-29 2018-10-16 姜嘉怡 It is folded over the mask of filtering layer

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DE9011154U1 (en) 1990-10-31

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