FR2969466A1 - Respiratory protection mask for recyclable single use - Google Patents

Respiratory protection mask for recyclable single use Download PDF

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Publication number
FR2969466A1
FR2969466A1 FR1005143A FR1005143A FR2969466A1 FR 2969466 A1 FR2969466 A1 FR 2969466A1 FR 1005143 A FR1005143 A FR 1005143A FR 1005143 A FR1005143 A FR 1005143A FR 2969466 A1 FR2969466 A1 FR 2969466A1
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FR
France
Prior art keywords
mask
body
layer
preferably
layers
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Granted
Application number
FR1005143A
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French (fr)
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FR2969466B1 (en
Inventor
Vianney Brillat
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.)
VALMY SAS, FR
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Deltalyo & Valmy
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Priority to FR1005143A priority Critical patent/FR2969466B1/en
Publication of FR2969466A1 publication Critical patent/FR2969466A1/en
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Publication of FR2969466B1 publication Critical patent/FR2969466B1/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • 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
    • 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
    • A41D13/1161Means for fastening to the user's head
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02Masks
    • A62B18/025Halfmasks
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/08Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
    • A62B18/084Means for fastening gas-masks to heads or helmets
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00Filters for breathing-protection purposes
    • A62B23/02Filters for breathing-protection purposes for respirators
    • A62B23/025Filters for breathing-protection purposes for respirators the filter having substantially the shape of a mask

Abstract

A single-use, shell-shaped breathing mask (1) consisting of a body (2) and holding straps (3,4), said body (2) being composed of at least one and preferably two layers (15, 16,17), of which at least one layer of filter material (15), and said body having a nasal region (11) with a protuberance (14), said holding straps (3,4) being elastic and being fixed on the body (2) of the mask (1) without addition of material, preferably by welding, the mask (1) being characterized in that all the layers (15, 16, 17) of materials constituting the body (2) are nonwovens of the same thermoplastic polymer material, and the holding straps (3, 4) consist of one or more components made of elastomeric or thermoplastic elastomeric polymer materials capable of forming a mixture with the polymer constituting the non-woven layers. woven.

Description

Disposable Respiratory Protection Mask

Field of the Invention The present invention belongs to the field of disposable respirators. More particularly, the respiratory masks according to the present invention have a general shell shape. State of the art There are known disposable respiratory protection masks of shell-shaped, or shell, whose body, adapted to cover the mouth and the nose of a person wearing the mask, is formed of layers of stacked materials, more or less rigid. Such masks are held in place on the head of a user by fastening straps or headband, elastic or not. The number of masks of this type manufactured each year has increased considerably following the appearance of the risks of major pandemics, and at the request of the public and the rulers. It is currently considered that the shelf life of these masks is 3 to 5 years, beyond they lose their filtration efficiency and must be destroyed, which produces a significant amount of waste, and generates a significant economic cost. It would therefore be advantageous to have such disposable respiratory masks, which are also recyclable easily and at low cost.

Among known disposable hulls, EP 1 185 181 of 3M discloses a mask whose body comprises a plurality of layers of materials, preferably at least three, for example an outer protective layer, a filter layer and a layer interior designed to improve the comfort of the mask. At least one of the layers includes a thermoplastic material comprising polyolefin fibers, such as polypropylene fibers, this layer preferably being the filtration layer. The mask is further provided with braided, knitted or woven holding straps of elastomeric / thermoplastic composite material, the elastomer preferably being polyisoprene, and the thermoplastic preferably being polypropylene. These straps are attached to the mask body by applying heat and pressure. The tightness of the mask on the face at the nose of the user is preferably obtained through a rigid metal nose clip. Such masks therefore generally comprise constituents composed of different materials. Due to the presence of the elastomer 2969466 -2 in the fastening strap, it is not possible to fully recycle them, and partial recycling is complicated and expensive. Patent applications WO 2009/22250 and WO 2009/22249 of Kimberly Clark disclose shell masks comprising a multilayer material body and having a headband comprised of a laminate of a nonwoven material and a an elastic polypropylene film. This headband is attached to the body of the mask through rigid fasteners and relatively complex shape, whose function is to facilitate the adjustment of the headband. The fastening elements of the headband may be polypropylene. In the patent application WO 2009/22250 the shell mask 10 described may be provided with a body consisting of layers of nonwoven polypropylene. The tightness of the mask on the face at the nose of the user is usually achieved through a rigid nose clip metal. These masks are relatively complex and expensive to manufacture, in particular because of the presence of rigid fasteners. These fasteners may, on the other hand, be a source of discomfort for the user as they may press on his face. Finally, these fasteners can be problematic if we consider a recycling of the mask, especially if the recycling process includes shredding / grinding steps. The company MSA markets under the trademark Affinite dust masks 20 whose retaining straps are made of polypropylene. These holding straps are attached to the mask body by a rigid polypropylene component welded to the body of the mask. MSA masks have a steel nasal bridge, and a polyurethane nasal foam. These masks therefore comprise many constituents having different compositions, they are therefore very difficult to recycle. On the other hand, several documents describe the recycling of respirator mask manufacturing waste, in particular mask masks, at the time of manufacture of the masks. This is the case for example for patents and patent applications GB 2 280 620, US 2008/011303, WO 2008/7642. However, none of these documents discloses a shell mask whose set of constituent elements all have the same chemical composition, and which is easy to recycle when its expiry date is exceeded. Thus, there are currently no disposable respirators of hull shape that can be easily recycled when their expiry date is exceeded.

OBJECT OF THE INVENTION The object of the present invention is to overcome the disadvantages of the masks described above, and to propose a disposable shell mask that is easily recyclable if it must be destroyed when its shelf life is exceeded or after use.

Another object of the invention is a disposable shell mask having a good seal with the face of the user, particularly in the nasal region, while being comfortable to wear. Another object of the invention is a disposable shell mask easy to manufacture and recycle, and whose manufacturing cost and recycling cost are low.

These objects are achieved by means of a single-use, shell-shaped breathing mask consisting of a body and holding straps, said body being composed of at least one and preferably two layers, of which at least one layer of filtering material, and said body having a nasal region having a protuberance said holding straps being elastic and being attached to the mask body without adding material, preferably by welding, mask in which furthermore all the layers of materials constituting the body are nonwovens of the same thermoplastic polymer material, and the support straps consist of one or more components made of elastomeric or thermoplastic elastomeric polymer materials capable of forming a mixture with the polymer constituting the nonwoven layers. The single-use, shell-shaped breathing mask of the invention is particularly intended to be used for the protection of n "public" in major pandemics, such as influenza of animal origin against which the world's population is not protected. It is therefore essential that large stocks of such masks are permanently available so that the masks can be quickly made available to users. However, it is currently considered that the maximum duration of storage of these masks is from three years to five years. Beyond it must be destroyed. Unlike existing masks, the mask of the invention is completely recyclable without prior separation step of its constituents, that is to say its layers of nonwoven and retaining straps. This total recyclability and simple to implement is obtained on the one hand by the fact that said holding straps are attached to the body of the mask without adding material, that is to say without staples, glue or other. This result is also obtained by the fact that all the constituents of the mask body are nonwovens of the same thermoplastic polymer. A thermoplastic polymer is inherently recyclable, the fact of having one for the entire body of the mask makes it possible during recycling to obtain a pure polymer. Finally, the recyclability in one step is achieved by holding straps of polymer or copolymer or mixture of elastomeric polymers, preferably thermoplastic elastomers. Such thermoplastic elastomeric materials are in themselves recyclable. In the context of the invention, the material constituting the straps is furthermore chosen to be able to form a mixture with the thermoplastic polymer of the nonwoven layers without the need to add a compatibilizer so that the recycling process be very simple. The mixture obtained after recycling the masks can be reused for the manufacture of other objects. It is possible to obtain, after recycling the masks of the invention, a reusable polymer by virtue of the appropriate choice of the material constituting the straps with respect to the polymer of the nonwoven layers of the mask body, and also because of the small proportion of the material constituting the straps in the material obtained after recycling. Indeed, the straps do not represent more than 150/0 of the total weight of the mask. Description of figures

Figure 1 is a perspective view of the front / outer face of the mask according to the invention.

Figure 2 is a perspective view of the rear / inside face of the mask according to the invention, the mask having a sealing web in the nasal region.

Figures 3a to 3c are views of the mask of the invention without the support straps. Figure 3a is a side view of the mask according to the invention. Figure 3b is a front view of the mask of the invention. Figure 3c is a rear view of the mask of the invention having a sealing web in the nasal region.

FIG. 4 is a sectional view of the mask of the invention along the line A / A of FIG. 3c, FIG. 5 is an enlarged view of the zone B of FIG. 4, on which the layers constituting the body are represented. of the mask.

Figures 6a and 6b are schematic sectional views of different types of stacks of material layers constituting the mask body of the invention. List of marks 1 Mask 2 Mask body 3 Upper holding strap 4 Lower holding strap 5 Sealing lip 6 Belt sealing area 7 Belt attachment area 8 Mask edge 9 Grooves 10 Voile 11 Nasal region 12 Slit veil 13 Weld between layers 14 Protuberance 15 Filter layer 16 Outer layer 17 Inner layer 18 Symmetry axis of the nasal region 11 19 Intermediate layer Description of the invention

The mask according to the invention is designed to isolate and protect its wearer against the risk of inhalation of harmful agents transported by air, such as dust, pollutants, bacteria, viruses, allergens, etc. Respiratory protection masks standards are in force in several countries. These standards have different content depending on the country, but globally meet identical needs. For example, respiratory protection masks are classified according to: - three levels of protection in the European legislation: FFP1, FFP2 and FFP3 ("FFP" meaning Filtering Facepiece particles, particulate filtering facepiece against particles), and must meet to the requirements of the European standard EN149: 2001 + Al: 2009, in particular in terms of total inward leakage, penetration of filter media in solid particles (NaCl) and liquid particles (paraffin) and respiratory resistance.

- two levels of protection in the US NIOSH legislation: N95 - N99 according to the standard for solid particle filtration, and three other levels of protection R95 R99 P100 according to the standard for the filtration of liquid particles .. The classification of the masks refers their particle filtration capacity of a given average size, about 0.6 pm for solid particles (NaCl) and 0.3 pm for liquid particles (paraffin) in EN149: 2001 + Al: 2009. The filtration capacity is 940/0 for 95% FFP2 masks for N95 masks and 990/0 for FFP3 and N99 masks. In particular, the thicknesses of the different layers are chosen to meet the requirements of the class in question. 2969466 -6- A mask classified FFP1 is intended to provide protection against non-toxic dust, for example cellulose, cotton, flour, clay, vegetable and animal oils, or against pollution. It finds its application in the textile industry, agribusiness, DIY, hygiene and cleaning. 5 A mask classified FFP2 (or N95) is intended to provide protection against concrete dust, cement, plaster (for example during demolition work, heavy work, sanding), softwood (from construction works). sanding, cutting), fine particles of paint and resin, plastic materials (eg from impact stripping, sanding, etc.); against viruses 10 (bird flu, SARS, tuberculosis), against environmental pollution or allergens. It finds its application in industry, construction, DIY, woodworking, automotive industry, bodywork and health. A mask classified FFP3 is intended to provide protection against asbestos fibers having a concentration of less than 1 fiber / cm 3 / h (for example for material handling or diagnosis), rockwool dust, glass wool (during handling or insulation work), lead (when sanding paints), hard wood particles, metal fumes; viruses (infectious respiratory diseases), bacteria (such as legionella). It finds its application in industry, construction, woodworking, metallurgy or health. In what follows, a "spunbond" material is understood to mean a spunbonded web or nonwoven fabric obtained by an extrusion technique, the resulting yarns generally having a diameter of between 13 μm and 16 μm; "meltblown" material means a non-woven web of meltblown microfibers obtained by an extrusion blow molding technique, the resulting yarns having a diameter of between 2 μm and 5 μm; "Needled nonwoven material" means a material consisting of one or more layers of non-woven fabrics which are intermingled together by mechanical bonding which involves passing through the nonwoven layers with multiple barbed needles, to which the fibers cling when the needles come up, leaving the fibers entangled.

The term "recyclable material" is understood to mean a material that can be recovered after use (or, in the case of the mask of the invention, if it has not been used before its expiry date), processed and reused as raw material in the manufacture of new objects. "Polymers capable of forming mixtures with one another" are understood to mean polymers such that, when they are mixed together, they form a miscible mixture, which is the case of polymers which are thermodynamically compatible with each other, or which are immiscible, but which make it possible to to obtain a material having mechanical properties, such as tensile strength, impact resistance, Young's modulus, good enough to allow the manufacture of objects, without the need to add to the mix a compatibilizer. In the context of the invention, such mixtures can be obtained when the amount of one of the polymers is less than 20% of the total weight of the mixture.

The mask 1 according to the present invention generally has a shell or shell shape. Both terms are used interchangeably in this text. The shell shape is preferred in the context of the present invention because it provides a good seal between the mask and the face of the user, particularly at the level of the wings of the nose, and without the mask is equipped with a rigid and malleable nasal bar that can be a source of discomfort and / or misuse. Such a seal without nasal bar could not be obtained with masks known as "duck bill" for example. The tightness in the nasal region is obtained thanks to particular characteristics of the mask. The mask according to the invention has a total filtration area of between 250 cm 2 and 300 cm 2. Its weight is generally low, preferably between 9 g and 15 g, because the layers of nonwoven chosen to make the body of the mask have a relatively low basis weight while having, at least for some of them, good filtration capabilities. Figure 1 shows a perspective view of the front face of the mask 1 according to the invention. The contour of the body 2 of the mask 1 is generally oval, except in the nasal region 11 intended to be in contact with the ridge and the wings of the nose of the user. In this nasal region 11, the mask has a protrusion 14 having a shape that allows it to substantially conform to the shape of the nose of a user. Preferably, the body 2 of the mask 1 is further provided on its periphery with a lip 5 which improves the seal of the mask on the face. The sealing lip 5 extends outside the body 2 of the mask, preferably over the entire periphery of said body 2. This lip 5 is substantially flat, and perpendicular to the walls of the shell at the edge of the body. said shell. Therefore, the lip 5 is supported substantially flat on the face of the wearer of the mask, thereby providing a contact and sealing surface between the face and the relatively large mask. The lip 5 is formed in one piece with the body 2 of the mask, as described below. With reference to FIG. 4, the body 2 of the mask according to the invention preferably consists of at least two layers 15, 16 of material in the form of a sheet, film, web, woven or non-woven fabric. All the layers constituting the body of the mask are made of materials having the same basic chemical composition. In an advantageous embodiment, this material is a synthetic polymer. More particularly, since the mask according to the invention is entirely recyclable, the polymer constituting the layers of the body of the mask must be a thermoplastic polymer, that is to say a polymer which melts or becomes viscous when it is heated beyond beyond a certain temperature. A synthetic polymer particularly suitable for producing the body of the mask according to the invention is polypropylene. Other thermoplastic polymers capable of forming nonwovens, such as polyethylene, polyamide, polyester, are also suitable for producing the body 2 of the mask of the invention. The different layers 15, 16 of the body of the mask of the invention are chosen to obtain a mask body that is in compliance with the standards in force specific to the different types of protection, namely for example FFP1, FFP2 and FFP3 in Europe. , and, according to the American NIOSH nomenclature, in N95 and N99. In particular, at least one of the layers 15 of the body of the mask is a layer of filter material, capable of filtering solid particles and / or droplets of liquid, electrically charged or uncharged. In one embodiment, the filter layer is a nonwoven web of melt blown microfibers, preferably electrostatically charged. This layer is able to retain very fine particles. It is an electret type fabric, charged with static electricity, for example by corona discharge. Polypropylene electrets are commercially available, for example marketed by Hollingworth and Vose.

Advantageously, the density of the filtration layer is between 40 and 80 g / m 2. According to another characteristic of the invention, the filtration layer is made based on two layers of a nonwoven of superposed polypropylene fibers, each having a basis weight of between 20 g / m 2 and 40 g / m 2. Nonwovens of polyethylene, polyester or polyamide may also be suitable. In another embodiment, the filter layer is a felt. According to yet another characteristic of the invention, the filter layer comprises a layer of an "electret" and a layer of needle felt, the layer of felt 5 being preferably placed on the outside with respect to the electret layer. . Depending on the protection class for the mask, the total thickness of the filter layer 15 is between 0.1 mm and 0.3 mm. The filtration layer is all the thicker as the protection class is high.

Advantageously, the body 2 of the mask further comprises an outer layer 16 having a good mechanical strength, which protects the filter layer from possible damage during the wearing of the mask. By "outer layer" is meant the layer furthest from the face of the user when the mask is worn. This outer layer gives in particular to the body of the mask sufficient rigidity so that the mask substantially retains its shape when worn by a user. It also offers resistance to abrasion. The outer layer 16 is preferably able to be shaped by thermoforming. The outer layer 16 is made of a material of the same chemical composition as the filter material of the filtration layer 15.

Advantageously, the outer layer is a polypropylene needled nonwoven. The outer layer preferably has a thickness of between 0.7 mm and 1 mm. Below 0.7 mm, the rigidity obtained for the body of the mask is not sufficient, above 1 mm, the layer does not let a sufficient quantity of air pass and this entails an important breathing discomfort possibly higher to the 25 values allowed by the standards. Such nonwoven needles are for example marketed by Ahlstrom. Other types of polypropylene nonwovens, such as spunbond nonwovens, can also be used for the outer layer of the mask body. Nonwovens of polyethylene, polyester or polyamide may also be suitable for producing the outer layer of the mask body of the invention. The outer layer may also have filtration properties, while being less efficient than the filter layer described above. The outer layer can in particular stop the coarser particles and thus prevent too rapid clogging of the filter layer, which improves the performance over time of the mask of the invention. In some embodiments of the body of the mask of the invention, the outer layer 16 is composed of several layers of materials, such as a nonwoven of synthetic polymer fibers folded on itself. In other embodiments, the outer layer 16 is monolayer. In a variant, the body 2 of the mask also comprises a so-called "reinforcing" layer, placed between the filtration layer 15 and the outer layer 16. This reinforcing layer is preferably a polypropylene spunbond nonwoven, of a mass surface area between 50 and 70 g / m2, and a thickness between 0.25 mm and 0.35 mm. This reinforcing layer improves the mechanical strength of the mask body. Such nonwovens are for example marketed by the company Fiberweb under the name STEX.

In another embodiment, the body 2 of the mask 1 further comprises a layer of material 17, placed inside the body of the mask and intended to be in contact with the face of the user wearing the mask. This layer protects the filtration layer from possible damage, it can also offer a better user comfort, for example by being made of a material soft to the touch.

The thickness of the inner layer is typically 0.05 mm to 0.1 mm. The inner layer is fine when the comfort, that is to say the softness to the touch, is preferred, and is thick when a higher rigidity is required. The inner layer 17 is made of a material of the same chemical composition as the filter material layer 15. Advantageously, the inner layer is a polypropylene spunbond nonwoven. Such nonwovens are for example marketed by Hollingworth and Vose. Other types of polypropylene nonwovens can also be used, as long as their mechanical properties are appropriate. Nonwovens of polyethylene, polyester or polyamide may also be suitable for producing the inner layer of the mask body of the invention. In order to give the mask of the invention adequate respiratory performance, the layers 15, 16, 17 chosen for producing the body of the mask (filter material layer, optionally outer layer, optionally inner layer) are relatively low thicknesses. Since these layers are preferably composed of non-woven synthetic polymer fibers, they are flexible and not very resistant to deformation. It is however essential that the entire body of the mask has sufficient rigidity so that the mask 5 substantially keeps its hull shape throughout its use. Therefore, in some embodiments, the body 2 of the mask is provided with reinforcing grooves. These grooves 9 are obtained during the manufacture of the mask by thermoforming. They are elongated and preferably arranged in the width of the body of the mask.

In some embodiments, the front portion is substantially planar as is visible in Figures 1 and 3a-3c. This substantially flat front portion is of ovoid shape and is intended to receive any mandatory notification impressions. In another embodiment, the rigidity of the body 2 of the mask and the cohesion between the various layers of the component are increased by means of weld points (not shown) between all the layers composing the body of the mask. These points are arranged regularly on the surface of the body of the mask, for example eight points of diameter of about 5 mm disposed on the flat front face of the mask, near the periphery.

The holding straps 3, 4, as visible in FIGS. 1 and 2, make it possible to hold the mask on the face of the user with a good seal between the mask and the face of the user. Preferably, the mask of the present invention comprises two holding straps, an upper strap 3 which passes over the ears of the wearer of the mask and a lower strap 4 which passes over the neck of the user. This configuration is optimal to keep in place the mask with a good seal. However, it is possible to make the mask of the invention with a single strap, for example for masks FFP1 for which the required seal is sufficiently low. Advantageously, the holding straps 3, 4 are made of an elastic material.

In the context of the present invention, the term "elastic" material is understood to mean a material which can stretch and withstand very large deformations without breaking under the application of a mechanical stress and which returns to its original form when stopped. solicitation. Elastomeric polymers and elastomeric thermoplastic polymers are for example such materials. In a particularly advantageous embodiment, the straps 3, 4 are made entirely of thermoplastic elastomer polypropylene. In the context of the present invention, the term "elastomeric thermoplastic" means a material having both properties of the elastomers, namely in particular the aforementioned elastic elongation capacity, and the properties of a thermoplastic material. especially the ability to melt at a sufficiently high temperature. In another embodiment, the retaining straps 3, 4 are made of a polypropylene nonwoven laminate and an elastomeric thermoplastic polypropylene.

In other embodiments, the retaining straps 3, 4 are made of a thermoplastic elastomer such as a blend or copolymer of polypropylene and thermoplastic elastomer or elastomer, such as EPDM (ethylene glycol). propylenediene) or SEBS (styrene ethylene butylene styrene). Such a material may be considered recyclable with polypropylene, i.e. it may be milled or shredded with the polypropylene constituting the nonwoven layers of the mask body, the resulting mixture of fragments may be melted and reconditioned for example in the form of granules which will be used for the manufacture of other objects. The body 2 of the mask represents about 850/0 of the total weight of the mask, the remainder being represented by the holding straps 3, 4. Therefore, the total proportion of polymer material from the nonwoven layers is at least 85% by weight of the composition of the material obtained after recycling of the mask of the invention. Advantageously, the total proportion of polymer material from the nonwoven layers is at least 950/0 by weight of the composition of the material obtained after recycling of the mask of the invention. Even more advantageously, the mask of the invention is 100% composed of a single polymeric material, for example polypropylene, so that the material obtained after recycling is a pure 1000/0 polymer. The straps 3, 4 are fixed on the body of the mask 2 without adding additional material, that is to say for example by welding. Preferably, the sealing lip 5 comprises wide zones 6 in which the straps 3, 4 are welded. This embodiment is advantageous because it allows the welding of the straps 3, 4 on a surface sufficient to have a solid attachment. straps on the body of the mask. The welding of the straps on the body of the mask is preferably performed by ultrasonics. Indeed, this technique is particularly economical and well suited to the welding of parts made of polymeric materials. Ultrasonic welding of thermoplastic polymers allows a clean and clean assembly and a solid and long-lasting junction. According to another characteristic of the invention, and as can be seen in FIG. 2, the mask further comprises at its nasal portion 11 a flexible web 10 fixed on the upper part of the sealing lip 5 of the body 2 of the mask. The flexible web 10 provides a filtration of the air likely to pass between the shell mask of the invention and the face of the user. Advantageously, the flexible web 10 is located in the same plane as the sealing lip 5. The web is generally symmetrical with respect to the longitudinal axis of symmetry 18 of the mask, and has an elongate opening 12, such as a slot , along this axis of symmetry. When the mask is not worn by the user, the web 10 has a shape such that it closes approximately the entire nasal region 11 of the body of the mask. When the user places the mask on his face, the elongated aperture 12 is at the ridge of the user's nose, and the veil opens in two symmetrical portions 10a, 10b which are placed each on one side of the nose of the user to improve the seal between the mask and the wings of the wearer's nose. The shape of the contour of the flexible web 10 is identical to that of the contour of the mask in the nasal region 11. The web 10 extends over about a quarter to one third of the total height of the mask. The web 10 is preferably formed of polypropylene nonwovens. In all cases, the composition of the web 10 is the same as that of the layers 15, 16, 17 constituting the body 2 of the mask 1. The fixing of the web 10 on the sealing lip 5 is preferably done by welding and again more preferably by ultrasonic welding.

The web 10 preferably has a thickness of between 0.2 mm and 0.4 mm. Preferably, the flexible web 10 is formed of two layers of polypropylene nonwoven, the first layer being a filtration layer of an electret meltblown nonwoven having a mass of about 70 g / m 2 and a thickness of about 0. 15 mm and the second layer being a non-woven spunbond with a basis weight of about 14 g / m 2 and a thickness of about 0.07 mm. The second layer is in contact with the face of the user when the mask is worn. In this embodiment, the web 10 has a filtration capacity close to that of the body of the mask. Alternatively, the web 10 consists of a single layer of polypropylene nonwoven. Its filtration capacity is lower than in the previous embodiment, it is however sufficient for example for class FFP1 masks. The method of manufacturing the mask of the invention generally comprises the following steps: a) supplying the different nonwovens which constitute the body 2 of the mask, namely the filtration layers 15, outer layer 16 and inner conch 17, and unwinding and unwinding said nonwovens. b) The outer layer 16 of the body 2 of the mask is thermoformed. When the material constituting the outer layer 16 of the body 2 of the mask is polypropylene, the thermoforming temperature is preferably between about 135 ° C. and 140 ° C., and the duration of the thermoforming is preferably between 3 and 5 seconds. . Optionally, if present, the reinforcing layer is thermoformed together with the outer layer. c) The filtration layer (s) 15, and the inner nonwoven layer 17 are "punched by stamping". Punching by stamping means a depression of said layers in the previously formed shell. D) Preferably, the different layers 15, 16, 17 of the body 2 of the mask are welded together by technical points of support and reinforcement. Very preferably, the various layers are ultrasonically welded, e) The different layers 15, 16, 17 of the body 2 of the mask are welded together on the periphery of the body 2 of the mask to constitute the sealing lip 5 Preferably, the layers are ultrasonically welded, f) the sealing lip 5 is cut to the appropriate shape, g) a traceability mark of the mask is printed on the outer layer of the mask, h) the retaining straps 3 4 (for example laminate-type elastics) are unwound and cut to length, i) The two retaining straps 3, 4 are welded to the sealing lip 5 at the intended locations, preferably by ultrasound, 2969466 J) The completed shell masks are then checked, transferred, pre-stacked and placed in a conveyor to be routed to their packing area. The marking can be done before or after the welding of the straps on the sealing lip. In another embodiment, the method further comprises the steps of: f1) cutting one or more nonwoven to form to form the flexible web 10, f2) welding the flexible web 10 on the sealing lip 5.

These additional steps are performed after the step of cutting the sealing lip. The mask of the present invention as described above is fully and easily recyclable. Disposable respiratory masks, for single use, intended to protect their carriers from contagious and in particular viral diseases, have a shelf life limited to 3 years to 5 years. After this time, when they have not been used, they must be destroyed. The mask of the invention, composed solely of polymer materials capable of forming mixtures with one another, is thus very easy to recycle, for example in the form of polymer beads, reusable for the manufacture of other products.

Polypropylene is particularly well suited to producing the mask of the invention. In particular, polypropylene may have the properties of an elastomer and can therefore be used to make the retaining straps. Polypropylene is also commonly used for producing nonwoven materials, and more particularly nonwoven filter materials, electrets type. However, other thermoplastic synthetic polymers can be used to make the mask according to the invention. As non-limiting examples, mention may be made of polyethylenes, polyesters and polyamides. 30

Claims (12)

  1. REVENDICATIONS1. A single-use, shell-shaped breathing mask (1) consisting of a body (2) and holding straps (3,4), said body (2) being composed of at least one and preferably two layers (15, 16,17), of which at least one layer of filter material (15), and said body having a nasal region (11) having a protuberance (14) having a longitudinal axis of symmetry (18), said support straps (3,4) being elastic and being fixed on the body (2) of the mask (1) without addition of material, preferably by welding, the mask (1) being characterized in that all the layers (15,16,17 of materials constituting the body (2) are nonwovens of the same thermoplastic polymer material, and the holding straps (3, 4) consist of one or more components made of elastomeric or elastomeric thermoplastic polymeric materials capable of forming a mixture with the polymer constituting the nonwoven layers.
  2. 2. Shell mask (1) according to claim 1, characterized in that the body (2) of the mask is composed of polypropylene nonwoven layers, and the straps (3, 4) comprise a suitable elastomeric or thermoplastic elastomer polymer. to form a mixture with the polypropylene.
  3. 3. Hull mask (1) according to claim 2 characterized in that the straps (3,4) are composed of 100% polypropylene.
  4. 4. Hull mask (1) according to any one of claims 1 to 3, characterized in that said filter material layer (15) is a meltblown polypropylene electret nonwoven, with a mass per unit area of between 40 and 80 g / m2.
  5. 5. Hull mask (1) according to any one of claims 1 to 4, characterized in that the body (2) of the mask comprises an outer layer (16) consisting of a nonwoven needled polypropylene having a basis weight included between 150 and 170 g / m2 and a thickness of between 0.7 mm and 1 mm.
  6. 6. Hull mask (1) according to any one of claims 1 to 5, characterized in that the body (2) of the mask further comprises a reinforcing layer consisting of a polypropylene spunbond nonwoven having a basis weight included Between 50 and 70 g / m2 and a thickness of between 0.25 mm and 0.4 mm, said reinforcing layer being placed between the filter layer and the outer layer.
  7. 7. shell mask (1) according to any one of claims 1 to 6, characterized in that the body (2) of the mask further comprises an inner layer (17) 5 consisting of a polypropylene spunbond nonwoven having a mass per unit area of between 12 and 15 g / m2 and a thickness of between 0.05 mm and 0.1 mm.
  8. 8. Hull mask (1) according to any one of claims 1 to 7, characterized in that it further comprises a sealing lip (5) formed integrally with said body (2), which s extends outside said body (2) of the mask, preferably all around said body (2), substantially flat and which lies in a plane substantially perpendicular to the edge (8) of the body (2) of the mask ,.
  9. 9. Hull mask (1) according to any one of claims 1 to 8, characterized in that the straps (3,4) are welded to the body (2) or, preferably, on the sealing lip (5). ), by ultrasonic welding. 15
  10. 10. Hull mask (1) according to any one of claims 1 to 9, characterized in that it further comprises a flexible web (10) closing said nasal region (11) of the body (2) of the mask on at least the entire height of the protuberance (14), said web (10) consisting of at least one nonwoven layer of a material of the same chemical composition as the layers of the body (2), said web (10) 20 being fixed on said sealing lip (5) or on the body (2) of the mask without addition of material, preferably by welding, and comprising an elongate opening (12) substantially parallel to the longitudinal axis of symmetry ( 18) of the protuberance (14).
  11. 11. A method of manufacturing the mask according to any one of claims 1 to 10 comprising the following steps: a) supplying the different nonwovens which constitute the body (2) of the mask (1), namely the layer of filtration (15), the outer layer (16) and the inner layer (17), and unwinding and unwinding said nonwovens, b) The outer layer (16) of the body (2), the mask is thermoformed knowing that when the material constituting the outer layer (16) of the body (2) of the mask is polypropylene, the thermoforming temperature is preferably between about 135 ° C. and 140 ° C., and the duration of the thermoforming is preferably between 3 and 5 seconds, c) The filtration layer or layers, and the inner nonwoven layer are punched by stamping, d) The various layers (15, 16, 17) of the body (2) of the mask are welded between them on the perimeter of the body of the mask to constitute the sealing lip (5), preferably by ultrasound, e) sealing lip (5) is cut to the appropriate shape, f) Mask traceability marking is printed on the outer layer of the mask, g) The retaining straps (3,4) are unwound and cut to length, h) The two retaining straps (3,4) are welded to the sealing lip (5) at the intended locations, preferably by ultrasound.
  12. 12. The manufacturing method according to claim 11 further comprising the steps of: e) cutting one or more non-woven material to form the flexible web (10), e2) welding the flexible web (10) to the sealing lip (5).
FR1005143A 2010-12-28 2010-12-28 Respiratory protection mask for recyclable single use Expired - Fee Related FR2969466B1 (en)

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FR1005143A FR2969466B1 (en) 2010-12-28 2010-12-28 Respiratory protection mask for recyclable single use

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FR1005143A FR2969466B1 (en) 2010-12-28 2010-12-28 Respiratory protection mask for recyclable single use
PCT/FR2011/053121 WO2012089964A1 (en) 2010-12-28 2011-12-21 Disposable, recyclable protective respiratory mask

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Publication number Priority date Publication date Assignee Title
CN103948187A (en) * 2014-04-26 2014-07-30 田顺天 Breathing gas heat exchange cold-proof mask

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2059782A (en) * 1979-09-25 1981-04-29 Draegerwerk Ag A breathing half-mask for once only use
WO1996028216A1 (en) * 1995-03-09 1996-09-19 Minnesota Mining And Manufacturing Company Fold flat respirators and processes for preparing same
WO2000074509A1 (en) * 1999-06-02 2000-12-14 3M Innovative Properties Company Face masks having an elastic and polyolefin thermoplastic band attached thereto by heat and pressure
US20080011303A1 (en) * 2006-07-17 2008-01-17 3M Innovative Properties Company Flat-fold respirator with monocomponent filtration/stiffening monolayer
US20090283096A1 (en) * 2006-05-18 2009-11-19 Cl.Com S.R.L. Protective mask against biological agents made of two parts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2059782A (en) * 1979-09-25 1981-04-29 Draegerwerk Ag A breathing half-mask for once only use
WO1996028216A1 (en) * 1995-03-09 1996-09-19 Minnesota Mining And Manufacturing Company Fold flat respirators and processes for preparing same
WO2000074509A1 (en) * 1999-06-02 2000-12-14 3M Innovative Properties Company Face masks having an elastic and polyolefin thermoplastic band attached thereto by heat and pressure
US20090283096A1 (en) * 2006-05-18 2009-11-19 Cl.Com S.R.L. Protective mask against biological agents made of two parts
US20080011303A1 (en) * 2006-07-17 2008-01-17 3M Innovative Properties Company Flat-fold respirator with monocomponent filtration/stiffening monolayer

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FR2969466B1 (en) 2012-12-28

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