FR3109058A1 - Method of manufacturing a protective mask and mask thus obtained - Google Patents

Abstract

The invention relates to a method of manufacturing at least one protective mask (1) comprising the following steps: - cutting, in a first sheet (23), a protective mask (1) in one piece comprising a body (2) intended to cover the nose and mouth of a user and at least a first and a second pair of bands intended to be attached behind the user's head, each of the bands (3, 4, 5, 6) being cut so as to present one end (13, 14, 15, 16) and a plurality of portions curved against each other in the plane P. Figure for the abstract: FIG. 1

Description

Process for manufacturing a protective mask and mask thus obtained

The invention relates to the field of protective masks and relates more particularly to a method of manufacturing a protective mask and the mask thus obtained.

Such a protective mask aims to protect its wearer against the inhalation of pathogenic agents, such as viruses or bacteria, harmful dust or gases and/or to protect third parties from pathogenic agents likely to be exhaled by its wearer.

Technology background

In the state of the art, processes are known in particular for manufacturing a protective mask which provide, first of all, for cutting out of a material permeable to gas, a body intended to cover the nose and the mouth of the wearer then, in a second step, to fix on said body fixing bands intended to pass behind the head of the wearer and to be tied together so as to ensure the fixing of the protective mask.

While the body cutting operations are likely to be automated, securing the fastening strips to the body of the protective mask requires additional operations and in some cases the intervention of operators. This leads to an increase in the manufacturing costs of the protective masks and to a very marked limitation of the manufacturing rates. However, it is necessary to be able to produce in a simple way, in very large quantities and at low cost, protective masks, in particular in the context of a large-scale health crisis.

In addition, protective masks are generally packaged in sachets or boxes. This type of packaging also slows down the production speed of protective masks.

Summary

One idea underlying the invention is to provide a method for manufacturing a protective mask that is simple to implement, inexpensive and allows high production speeds.

According to one embodiment, the invention provides a method for manufacturing at least one protective mask comprising the following steps:
- providing a first sheet made of an air-permeable material and extending in a plane P;
- cutting, in said first sheet, a protective mask in one piece comprising a body intended to cover the nose and the mouth of a user and at least a first and a second pair of strips, each of the first and second pairs strips comprising a first strip and a second strip which respectively join a first portion and a second portion of the body arranged respectively on either side of a median axis of the body, the first strip and the second strip of each of the first and second pairs of strips being intended to be attached to each other behind the head of the user, each of the first and second strips being cut so as to present an end and a plurality of portions curved against each other in the P plane.

Thus, the protective mask being formed in one piece during the cutting step, the subsequent steps of securing the fixing strips to the body of the mask are eliminated.

In addition, taking into account the shape of the strips in the plane P and in particular the fact that the portions of the strips are curved against each other so that the same cutting line delimits the edges of two adjacent portions of said strip , material scrap is limited. This shape of the strips also makes it possible to retain for the sheet of material thus cut a certain hold which allows high production speeds.

Such a method therefore makes it possible to produce protective masks quickly and at low cost.

According to embodiments, such a method may comprise one or more of the following characteristics.

According to one embodiment, each of the first and second strips of the first and second pairs of strips wraps in the plane P of the first sheet around said end until it joins the body. In other words, the bands have a general spiral shape.

According to one embodiment, the first and second bands of each of the first and second pairs of bands make, in flat configuration, more than two turns around their end. This makes it possible to obtain bands of sufficient length to be easily tied behind the user's head.

According to one embodiment, the body has a lower edge and an upper edge opposite to each other as well as a first side edge and a second side edge opposite to each other, the first band and the second strip of each of the first and second pairs of strip joining respectively the first side edge and the second side edge.

According to one embodiment, the lower edge and the upper edge have a complementary shape. This makes it possible to attach two successive protective masks so as to further limit material waste.

According to one embodiment, the upper edge has a protrusion projecting upwards and intended to cover the nose of the user.

According to one embodiment, the first strips of the first and second pairs of strips are, in flat configuration, arranged contiguous to one another and together, preferably entirely, occupy a zone along the first lateral edge and the second strips of the first and second pairs of strips are, in planar configuration, arranged contiguously and occupy together, preferably entirely, a zone along the second lateral edge. This makes it possible to further limit scrap material.

According to one embodiment, the protective mask comprises a third pair of strips comprising a first strip and a second strip which respectively join the first portion and the second portion of the body and are intended to be attached to each other behind the user's head, each of the first and second strips of the third pair of strips being cut so as to present one end and a plurality of portions curved against each other in the plane P.. This makes it possible to ensure a better hold of the protective mask on the user's head.

According to one embodiment, each of the first and second strips of the third pair of strips are cut so as to wrap in the plane P of the first sheet around said end until they join the body.

According to one embodiment, the first strip and the second strip of the third pair of strips respectively join the first side edge and the second side edge.

According to one embodiment, the first strips of the first, second and third pairs of strips are, in flat configuration, arranged contiguous to one another and occupy a zone bordering, preferably entirely, the first lateral edge and the second strips of the first, second and third pairs of strips are, in planar configuration, arranged contiguously and occupy a zone running along, preferably entirely, the second lateral edge.

According to another embodiment, the first strip and the second strip of the third pair of strips respectively join a first end and a second end of the upper edge, and are, in planar configuration, arranged contiguous to one another. another and occupy, preferably entirely, a zone along the upper edge of the protective mask.

According to an advantageous embodiment, in flat configuration, each of the first and second lateral edges has curved shapes complementary to those of the first bands of the first and second pairs of bands and to those of the second bands of the first and second pairs of bands. This makes it possible to further limit scrap material.

According to one embodiment, the body and the first and second pairs of bands are configured such that no scrap of material is generated inside a peripheral cutout delimiting the perimeter of the protective mask.

According to one embodiment, the first sheet is made of a textile material, preferably non-woven.

According to one embodiment, the first sheet is made of a non-woven material chosen from Polyester, Polypropylene, viscose and Polyethylene.

According to one embodiment, prior to the cutting of the protective mask, the first sheet is placed against a second sheet intended to support the first sheet during the cutting of the protective mask.

According to one embodiment, the second sheet is made of a material chosen from polyester films, polyethylene films and paper.

According to one embodiment, a plurality of protective masks are cut out of the first sheet.

According to one embodiment, the protective masks are linked to each other by the second sheet.

According to one embodiment, the first sheet and the second sheet adhere to each other by means of an adhesive or an electrostatic effect.

According to one embodiment, the second sheet has pre-cut lines each extending between two successive protective masks.

According to one embodiment, the protective masks are linked to each other by breakable links formed in the first sheet.

According to one embodiment, the plurality of protective masks and the second sheet are rolled up around a support cylinder.

According to one embodiment, the protective mask is cut by means of a cutting cylinder comprising cutting threads corresponding to the shape of the protective mask to be cut.

According to one embodiment, the invention also provides a protective mask comprising a body intended to cover the nose and the mouth of a user and at least a first and a second pair of bands formed in one piece with the body , each of the first and second pairs of strips comprising a first strip and a second strip which join respectively a first portion and a second portion of the body disposed respectively on either side of a median axis of the body, the first strip and the second band of each of the first and second pairs of bands being intended to be attached to each other behind the user's head, each of the first and second bands having one end and having a shape such that, in a configuration plane in which the protective mask extends in a plane P, each first or second band has a plurality of portions folded against each other in the plane P.

According to one embodiment, each first or second band wraps, in the plane P, around the end of said first or second band until it joins the body.

According to one embodiment, the invention also provides an assembly comprising a plurality of aforementioned protective masks which are supported by a second sheet and wound around a support cylinder so as to form a roll of protective masks. This offers packaging that is faster to produce, easier to transport and allows simple distribution of protective masks.

According to one embodiment, the assembly further comprises a reel comprising a box in which the roll of protective masks is housed and an axis on which the support cylinder is threaded. This further facilitates the distribution of protective masks.

Brief description of figures

The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the following description of several particular embodiments of the invention, given solely by way of illustration and not limitation. , with reference to the accompanying drawings.

FIG. 1 represents a protective mask according to a first embodiment.

FIG. 2 represents a protective mask according to a second embodiment.

Figure 3 is a schematic side view of an installation for manufacturing a protective mask.

Figure 4 is a partial top view of the installation of Figure 3.

FIG. 5 is a side view of a first gas-permeable sheet, intended for the manufacture of a protective mask and of a second sheet intended to support the first sheet, in particular during the cutting operations.

Figure 6 is a side view of a series of protective masks resting on the second sheet after the cutting operations.

Figure 7 is a diagram of a reel that can be associated with a series of protective masks packaged in a roll

Figure 8 is a schematic view of one side of the reel of Figure 7.

FIG. 9 represents a series of protective masks according to a third embodiment.

In relation to FIG. 1, a protective mask 1 according to a first embodiment is described below.

The protective mask 1 is made in one piece from an air-permeable material. Advantageously, the gas-permeable material is capable of filtering particles greater than 3 μm, preferably at least 70% of particles greater than 3 μm. The air-permeable material comprises at least one woven or non-woven fabric, and preferably a non-woven fabric.

For example, the nonwoven fabric is chosen from polyester, polypropylene, viscose and polyethylene. The threads or filaments of the nonwoven fabric are in particular capable of being obtained by the melted (“spun” in English language) or wet (“wet-laid” in English language) route and consolidated by mechanical means, by needling or by jet water for example, chemically or thermally.

If the breathable material comprises a woven textile, this is, for example, chosen from Cotton, Wool, Polyester, Polyamide, Acrylic and Elastane.

According to one embodiment, the gas-impermeable material is a multilayer composite material comprising several layers chosen from the aforementioned nonwoven and/or woven textiles.

The thickness of the air-permeable material is between 10 and 2000 μm, advantageously between 250 and 750 μm, and for example of the order of 550 μm

The protective mask 1 is represented, in FIG. 1, in a flat configuration, as obtained at the end of an operation, described later, of cutting a sheet of material permeable to gas.

The protective mask 1 comprises a body 2 intended to cover the user's nose and mouth and two pairs of strips intended for fixing the protective mask 1 to the user's head. The body 2 is defined, on the one hand, by a lower edge 7 and an upper edge 8 opposite to each other, and on the other hand, by side edges, left 19 and right 20, opposite and connecting the lower edge 7 to the upper edge 8. In the embodiment shown, the lower edge 7 is rectilinear while the upper edge 8 has a central zone comprising a protrusion 9 projecting upwards and intended to cover the nose of the user. The protective mask 1 has an axial symmetry with respect to a median axis 10. The median axis 10 divides the body 2 of the protective mask 1 into two portions which are symmetrical to each other with respect to the axis median 10, namely a first portion 11 and a second portion 12. Each pair of strips comprises a first strip 3, 5 which joins the first portion 11 and a second strip 4, 6 which joins the second portion 12. The first strip 3 , 5 and the second strip 4, 6 of each pair of strips are intended to be tied together behind the user's head.

In the flat configuration shown, the strips 3, 4, 5, 6 have a plurality of portions which are bent against each other. In the embodiment shown, the strips 3, 4, 5, 6 each consist of alternating straight portions and angled portions allowing the straight portions to bend against each other.

More particularly, in the embodiment shown, the strips 3, 4, 5, 6 have the general shape of a spiral. Thus, each strip 3, 4, 5, 6 wraps, in the considered plane P, around its respective end 13, 14, 15, 16, moving further away from it with each turn, until it joins the body 2 of the protective mask 1. Advantageously, the strips 3, 4, 5, 6 have a substantially constant width. In the embodiment shown, the strips 3, 4, 5, 6 make two more than two complete turns around their end 13, 14, 15, 16.

When using the protective mask 1, the strips 3, 4, 5, 6 are unrolled and thus have a sufficient length to be able to be tied in pairs behind the user's head.

When the strips 3, 4, 5, 6 are, in their rolled-up state corresponding to the planar configuration of the protective mask 1, the two strips 3, 5 and 4, 6 which join the same first or second portion 11, 12 of the body 2 are arranged contiguous to one another and occupy the entire area along the corresponding left 19 or right 20 side edge of the protective mask 1. In addition, each of the left 19 and right 20 side edges have curved shapes complementary to those of the two bands 3, 5 and 4, 6 which join it. Thus, in FIG. 1, each of the left 19 and right 20 side edges has a projecting zone 36 positioned between the two corresponding strips 3, 5 and 4, 6.

The geometry of the body 2 and of the bands 3, 4, 5, 6 is such that the protective mask 1 is able to be cut without generating any scrap material inside a peripheral cutout delimiting the perimeter of the protective mask. protection 1. This further limits material consumption.

In the embodiment of Figure 1, the strips 3, 4 join the upper end of the left 19 and right 20 side edges, in the extension of the upper edge 8, while the strips 5, 6 join the lower end left 19 and right 20 side edges, in the extension of the lower edge 7. The strip 3 which joins the upper end of the left side edge 19 as well as the strip 6 which joins the lower end of the right side edge 20 turn from from their end 13, 16 in a clockwise direction while the strip 4 which joins the upper end of the right side edge 20 and the strip 5 which joins the lower end of the left side edge 19 rotate counterclockwise from from their end 14, 15.

Figure 2 illustrates a protective mask 1 according to a second embodiment. This second embodiment differs from the first embodiment shown in FIG. 1 in that it includes a third pair of strips and thus makes it possible to ensure better retention of the protective mask 1 on the user's head. Like the other two pairs of bands described previously, the third pair of bands comprises a first band 21 and a second band 22 which respectively join the first portion 11 and the second portion 12 of the body 2. The first band 21 and the second band 22 of the third pair of bands are also intended to be tied together behind the user's head.

In flat configuration, strip 21 and strip 22 also have the general shape of a spiral. They roll up in the plane P of the protective mask 1 around their end 17, 18 moving further away from it with each turn, until they join the body 2 of the protective mask 1.

When the strips 21, 22 are in their rolled-up state corresponding to the flat configuration of the protective mask 1, the two strips 21, 22 are arranged adjacent to each other and occupy substantially the entire area along the upper edge. 8 of the protective mask 1. The bands 21, 22 respectively join one and the other of the ends of the upper edge 8 and are wound in opposite directions of rotation. The strip 21 which joins the left end of the upper edge 8 winds counterclockwise from its end 17 while the strip 22 which joins the right end of the upper edge 8 winds clockwise from its end 18.

It should also be noted that, in the embodiment of FIG. 2, the arrangement of the strips 3, 4 is also modified. Indeed, the strips 3, 4 join the left 19 and right 20 side edges, in a middle zone, just above the zone occupied by the strips 5, 6.

Figure 9 illustrates protective masks 1 according to another embodiment. This embodiment differs in particular in that the upper edge 8 and the lower edge 7 of the protective mask 1 have complementary shapes. Thus, the lower edge 7 has in particular an indentation of a shape complementary to the protuberance 9 projecting upwards from the upper edge 8 of the protective mask 1. Thus, as shown in FIG. 9, when several protective masks 1 are made the one after the other in the same sheet of material permeable to gas, it is possible to attach two successive protective masks 1 so as to further limit material scrap.

In addition, according to an advantageous variant, the cut line corresponding to the upper edge 8 of a protective mask 1 and to the lower edge 7 of the adjacent protective mask 1 is only cut incompletely so as to leave one or more breakable links 36 between the upper edge 8 of a protective mask and the lower edge 7 facing the adjacent protective mask 1. Such an arrangement is advantageous in that it makes it possible to ensure a connection between the protective masks 1 making it possible to facilitate their packaging.

Furthermore, this embodiment also differs from the embodiment of Figure 1 in that it includes a third pair of bands. The first strip 37 and the second strip 38 of the third pair of strips respectively join the left 19 and right 20 side edges. The strip 37 of the third pair of strips joins the left side edge 19 between strips 3 and 5 while strip 38 joins the right side edge 20 between the strips 4, 6. The strips 37, 38 have a plurality of portions which are curved against each other in the plane P. They are each made up of alternating straight and angled portions allowing the straight portions to be folded against each other.

In this embodiment, the strips 37, 38 join a central portion of one of the left 19 or right 20 side edges. Each strip 37, 38 comprises:
- a first part which comprises three rectilinear portions which are curved one above the other and which extends from the left 19 or right 20 side edge and towards the upper edge 8;
- a second part which extends from the end 39, 40 of the strip 37, 38 and comprises two rectilinear portions which are curved one above the other and which extends towards the lower edge 7 from the end 39, 40; And
- a bent portion which connects the first and the second part.

In this embodiment, when the strips 3, 4, 5, 6, 37, 38 are in their rolled-up state corresponding to the planar configuration of the protective mask 1, the three strips 3, 37, 5 are arranged contiguously the to each other and occupy the entire area along the left side edge 19 of the body 2 while the three strips 4, 38, 7 are arranged adjacent to each other and occupy the entire area along the right side edge 20 of the body 2 .

In connection with Figure 3, an installation and a method of manufacturing a protective mask 1 are described.

The installation comprises a first sheet 23 and a second sheet 24 wound on a reel. The first sheet 23 is made of a gas-permeable material and is intended to be cut to form one or more protective masks 1, as described above. The second sheet 24 is a support sheet making it possible to support the first sheet 23, in particular during the cutting operation of the protective mask 1. Advantageously, the second sheet 24 also makes it possible to support the protective mask 1 during its packaging and transport. The second sheet 24 is made of a material chosen from polyester films, polyethylene films and paper. The second sheet 24 has for example a thickness of between 10 and 20,000 μm, preferably between 10 and 100 μm, and for example of the order of 25 to 50 μm.

As shown in Figure 3, the first sheet 23 and the second sheet 24 are led into a press 25, between a rolling cylinder 26 driven in rotation and a support surface 27, so as to press the first sheet 23 against the second sheet 24. The support surface 27 is, for example, made up of a conveyor belt or a series of conveyor rollers. According to one embodiment, the face of one of the first and second sheets 23, 24 facing the other of the first and second sheets 23, 24 has an adhesive making it possible to temporarily secure the first sheet 23 to the second sheet 24 The adhesive is for example an acrylic adhesive.. According to another embodiment, the first sheet 23 and the second sheet 24 adhere to each other by electrostatic effect. The superposition of the first sheet 23 and the second sheet 21, at the exit of the rolling roll 26 is shown in Figure 5.

Subsequently, the first and the second sheets 23, 24 pass between the support surface 27 and a cutting cylinder 28 driven in rotation. The cutting cylinder 28 is equipped with cutting nets configured to cut the body 2 and the strips 3, 4, 5, 6, 21, 22 of the protective mask 1 according to one of the geometries shown in Figures 1, 2 and 9. According to an alternative embodiment, the depth of the cutting threads is such that the first sheet 23 is cut so as to form a protective mask 1, as described above, without also cutting the second sheet 24. Although it has been found that the cutting of the protective mask 1 by means of a cutting cylinder 28 makes it possible to obtain the highest manufacturing speeds, the method can, according to other embodiment variants, use other tools cutting tool, such as a laser cutter, a water jet cutter, a bridge press or a table with an oscillating knife for example.

At the exit of the cutting tool, the scraps of the first sheet 23, illustrated by hatching in FIG. 4, are removed. There is thus obtained a series of protective masks 1 supported by the second sheet 24, as shown in Figure 6.

According to one embodiment, the assembly consisting of the second sheet 24 and the protective masks 1 thus produced is wound around a support cylinder 29, for example made of cardboard, so as to form a roll of protective masks. In an advantageous variant, the second sheet 24 has pre-cut lines 30, represented in FIGS. 5 and 6, which are each provided between two successive protective masks 1 so as to facilitate the separation of the protective masks 1 during their use. The pre-cut lines 30 are obtained by a dedicated cutting tool or by the cutting cylinder 28 described above. In this case, the cutting cylinder 28 has dedicated cutting threads.

According to another variant embodiment, it is also possible to cut the second sheet 24 between two successive protective masks 1 and then to condition the protective masks 1, for example by stacking them one above the other. Each piece of the second sheet 24 is then inserted between two protective masks 1.

According to other variant embodiments, it is also possible to separate the protective masks 1 thus produced from the second sheet 24, or even to dispense with a second sheet 24 during the operations of cutting the protective masks 1.

According to one embodiment, shown schematically in Figures 7 and 8, the roll 34 of protective masks consisting of the second sheet 24 and protective masks 1 rolled up on a support cylinder 29 is associated with a reel 31. The reel 31 comprises a box 32 in which is housed the roll 34 of protective masks. The reel 31 further comprises a shaft 33 on which is threaded the support cylinder 29 of the roll 34 of protective masks. The axis 33 is rotatable or, alternatively, if the latter is fixed, the support cylinder 29 is mounted rotatably on the axis 33, so as to ensure the distribution of the protective masks 1. By elsewhere, the box 32 of the reel 31 has a face equipped with a dispensing slot 35, as shown in Figure 8, through which the second sheet 24 and the protective masks 1 pass.

Although the invention has been described in connection with several particular embodiments, it is obvious that it is in no way limited thereto and that it includes all the technical equivalents of the means described as well as their combinations if these fall within the scope of the invention.

The use of the verb "to comprise", "to understand" or "to include" and of its conjugated forms does not exclude the presence of other elements or other steps than those set out in a claim.

In the claims, any reference sign in parentheses cannot be interpreted as a limitation of the claim.

Claims (23)

Method for manufacturing at least one protective mask (1) comprising the following steps:
- providing a first sheet (23) made of an air-permeable material and extending in a plane P;
- cutting, in said first sheet (23), a protective mask (1) in one piece comprising a body (2) intended to cover the nose and the mouth of a user and at least a first and a second pair of strips, each of the first and second pairs of strips comprising a first strip (3, 5) and a second strip (4, 6) which respectively join a first portion (11) and a second portion (12) of the body (2) disposed respectively on either side of a central axis (10) of the body (2), the first strip (3, 5) and the second strip (4, 6) of each of the first and second pairs of strips being intended to be tied together behind the user's head, each of the first and second strips (3, 4, 5, 6) being cut to present an end (13, 14, 15, 16) and a plurality of portions curved against each other in the plane P. A method of manufacture according to claim 1, wherein each of the first and second strips (3, 4, 5, 6) of the first and second pairs of strips wraps in the plane P of the first sheet (23) around said end 13, 14, 15, 16) until reaching the body (2). Manufacturing method according to Claim 1 or 2, in which the body (2) has a lower edge (7) and an upper edge (8) opposite each other as well as a first side edge (19) and a second side edge (20) opposite each other, the first strip (3, 5) and the second strip (4, 6) of each of the first and second pairs of strips respectively joining the first side edge (19 ) and the second side edge (20). Manufacturing method according to claim 3, in which the lower edge (7) and the upper edge (8) have a complementary shape. Method of manufacture according to claim 3 or 4, in which the first strips (3, 5) of the first and second pairs of strips are, in planar configuration, arranged contiguous to one another and together occupy an area along the first lateral edge (19) and in which the second strips (4, 6) of the first and second pairs of strips are, in planar configuration, arranged contiguously and together occupy an area along the second lateral edge (20). Manufacturing process according to any one of claims 1 to 3, in which the protective mask (1) comprises a third pair of bands comprising a first band (21, 37) and a second band (22, 38) which join respectively the first portion (11) and the second portion (12) of the body (2) and are intended to be attached to each other behind the user's head, each of the first and second bands (21, 22, 37, 38) of the third pair of strips being cut so as to present an end (17, 18) and a plurality of portions curved against each other in the plane P. Method of manufacture according to Claim 6 taken in combination with any one of Claims 3 to 5, in which the first strip (37) and the second strip (38) of the third pair of strips respectively join the first lateral edge (19 ) and the second side edge (20). Method of manufacture according to claim 7, in which the first strips (3, 5) of the first, second and third pairs of strips are, in planar configuration, arranged contiguous to one another and together occupy an area along the first lateral edge (19) and in which the second strips (4, 6) of the first, second and third pairs of strips are, in planar configuration, arranged contiguously and together occupy an area along the second lateral edge (20 ). Method of manufacture according to claim 6 taken in combination with any one of claims 3 to 5, in which the first strip (21) and the second strip (22) of the third pair of strips respectively join a first end and a second end of the upper edge (8), and are, in flat configuration, arranged contiguous to one another and occupy a zone along the upper edge (8) of the protective mask (1). Manufacturing process according to any one of Claims 1 to 9, in which the first sheet (23) is made of a textile material, preferably non-woven. Manufacturing process according to claim 6, in which the first sheet (23) is made of a non-woven material chosen from polyester, polypropylene, viscose and polyethylene. . Manufacturing process according to any one of Claims 1 to 11, in which, prior to the cutting of the protective mask (1), the first sheet (23) is placed against a second sheet (24) intended to support the first sheet (23 ) when cutting the protective mask (1). Manufacturing process according to Claim 12, in which the second sheet (24) is made of a material chosen from among polyester films, polyethylene films and paper. Manufacturing process according to claim 12 or 13, in which a plurality of protective masks (1) are cut out from the first sheet (23). Manufacturing method according to claim 14, in which the protective masks (1) are bonded to each other by the second sheet (24). Manufacturing process according to claim 15, in which the second sheet (24) has pre-cut lines (30) each extending between two successive protective masks (1). Manufacturing process according to claim 14, in which the protective masks (1) are linked to each other by breakable links (36) formed in the first sheet (24) Manufacturing process according to any one of Claims 14 to 17, in which the plurality of protective masks (1) and the second sheet (24) are wound around a support cylinder (29). Manufacturing process according to any one of Claims 1 to 18, in which the protective mask (1) is cut by means of a cutting cylinder (28) comprising cutting threads corresponding to the shape of the protection (1) to be cut. Protective mask (1) comprising a body (2) intended to cover the nose and the mouth of a user and at least a first and a second pair of strips formed in one piece with the body (2), each of first and second pairs of strips comprising a first strip (3, 5) and a second strip (4, 6) which respectively join a first portion (11) and a second portion (12) of the body (2) arranged respectively on either side and on the other side of a median axis (10) of the body (2), the first strip (3, 5) and the second strip (4, 6) of each of the first and second pairs of strips being intended to be attached to the to each other behind the user's head, each of the first and second bands (3, 4, 5, 6) having one end (13, 14, 15, 16) and having a shape such that, in a configuration plane in which the protective mask (1) extends in a plane P, each first or second band has a plurality of portions curved against each other in the plane P. Protective mask (1) according to claim 20, in which each first or second band wraps (3, 4, 5, 6), in said plane P, around the end of said first or second band until join the body (2). Assembly comprising a plurality of protective masks (1) according to claim 21 which are supported by a second sheet (24) and rolled around a support cylinder (29) so as to form a roll (34) of protective masks . Assembly according to claim 21 further comprising a reel (31) comprising a box (32) in which the roll (34) of protective masks is housed and a shaft (33) on which the support cylinder (29) is threaded.