DE202020102317U1 - Mouth-nose mask - Google Patents

Abstract

Mouth-nose mask (1), showing
a first filter stack (4) which has at least one first filter layer (12) formed from fibers with a diameter of less than 5 micrometers, the first filter stack (4) having an elongated shape,
- A second and a third filter stack (6,8), which are identical with respect to the respective filter layer (12, 14) to the first filter stack (4), the second and the third filter stack (6, 8) along one in If the dividing line (10) runs in the longitudinal direction, the shape of the first filter stack (4) is reproduced,
- At least one tether for fixing the filter stack (4,6,8) to the head, wherein
- The second and third filter stacks (6, 8) are placed on the first filter stack (4) and are connected to one another in an edge region (18) that runs around the shape of the first filter stack (4).

Description

The invention relates to a mouth-nose mask.

The term “mouth-nose mask” (also referred to as “mouth-nose protection”, in short “mouth protection”) is understood to mean in particular an air-permeable mask that covers the mouth and nose of the user when worn as intended. Such masks are available in different versions. A corresponding mask is known as the “classic” mask, also referred to as the “surgical mask”, by means of which the far-reaching ejection of potentially contaminated droplets by the wearer is contained and the risk of infection of third parties is to be reduced. In principle, surgical masks of this kind are not or hardly suitable for self-protection against infection from droplets contaminated with germs, since these are insufficient with regard to their filtering action and / or the so-called leakage (in particular between the mask and face).

For this reason, masks with a filter effect, which are classified in the standardized classes FFP1 to FFP3, are used as respiratory protection. Masks conforming to FFP1 are also known as “dust protection masks”.

Due to the current progressive spread of the SARS-CoV-2 virus, which leads or may lead to respiratory disease COVID-19, the use of mouth-nose masks to protect third parties is recommended or even mandatory in some states and countries. Due to the already very advanced spread of SARS-CoV-2, which has led to a procurement bottleneck of mouth-nose masks, a simple and, in particular, quickly recordable manufacture of such masks is of great interest.

The object of the invention is therefore to enable simple manufacture of mouth-nose masks.

This object is achieved according to the invention by an oral-nasal mask with the features of claim 1. Furthermore, this object is also achieved by a method for manufacturing such an oral-nasal mask, which is also described below. Advantageous and partly inventive embodiments and further developments of the invention are set out in the subclaims and the description below.

The mouth-nose mask according to the invention (hereinafter referred to briefly as “mouth protection”) has a first filter stack, which in turn has at least one first filter layer which is formed from fibers with a diameter of less than 5 micrometers. The first filter stack also has an elongated shape. The mouthguard also has a second and a third filter stack which are identical in construction to the first filter stack with regard to the filter layer or layers. The second and third fiber stacks thus also have the first filter layer. The second and the third filter stack form the shape of the first filter stack placed alongside one another along a dividing line running in the longitudinal direction (in particular the first filter stack). In particular, in other words, the second and third filter stacks correspond to a first filter stack divided along the dividing line. The mouthguard also has at least one preferably elastic tether, preferably two such tethers for fixing the filter stack to the head of a user (i.e. a person). The second and the third filter stack are placed on the first filter stack and (preferably only) connected to it in the edge region.

In figurative terms, two identical filter stack blanks lie on top of one another and are connected to one another along their edges, one of the two filter stack blanks being divided or separated along the dividing line to form the second and third filter stacks.

Due to the choice of the fibers of the respective first filter layer with a diameter of less than 5 micrometers, a comparatively high filter effect is made possible, which can be in the range of the FFP2 or even FFP3 classification. This means that the mouthguard can not only help to reduce the risk of infection by third parties, but also, in principle, enable self-protection.

In addition, the construction and thus the manufacture of the mouthguard described here and below is comparatively simple.

In an expedient embodiment, the second and third filter stacks with their respective first filter layers, in particular at least in an edge region running around the shape of the first filter stack, are placed directly (ie immediately, in particular without the interposition of a further layer) on the first filter layer of the first filter stack and connected to it (preferably only) in the edge area.

In principle, the second and third filter stacks can also be sewn or stapled in the edge area with the first filter stack. In a preferred embodiment, in particular for low leakage due to the impact formed in the edge area between the filter stacks - optionally in addition to sewing or stapling - cohesively connected. In particular, the filter stacks are thermally joined or glued to one another, in particular using hot glue. As a result, the joining time is essentially determined by the cooling time of the hot glue. The filter stacks are welded or hot stamped for thermal joining. The combination of sewing or stapling with one of the cohesive connection methods offers the advantage of a particularly stable connection which nevertheless has a low leakage.

In a preferred embodiment, in an intended wearing state (of the mouthguard on the head of the person) the dividing line is arranged at least approximately parallel (i.e. in particular also with slight, handling-related deviations of up to +/- 15 degrees) to the transversal plane of the user. The second filter stack arranged above the dividing line in the intended wearing state has opened to the top and thus lies on the nose of the user with its first filter layer (in particular with its side facing the first filter layer of the first filter stack during the intended production). The third filter stack (also in the intended state of wear) arranged below the dividing line is opened to the underside analogous to the second filter stack and lies with its first filter layer (in particular again with its side that faces the first filter layer of the first filter stack during the intended production). under the user's chin.

Because of the connection of the three fiber stacks described above, a pocket is thus formed which can be opened and placed over the chin, mouth and nose. Due to the fact that the edges of the second and third filter stacks abut against one another during production at the common dividing line - otherwise they could not reproduce the shape of the first filter stack - the mouthguard is automatically warped when the second and third filter stacks are opened which at least essentially follows the curvature of the face. This automatically allows the face mask to fit well.

In an advantageous embodiment, the first filter stack has a spindle-like shape (or, in other words, the cross section of a lens, in particular an optical meniscus lens). Thus, with the face mask lying flat, the longitudinal ends are preferably comparatively narrow or tapering and the intermediate central region (preferably continuously) is increasingly formed in width. This further supports the bulging of the mouthguard when the second and third filter stacks are opened, so that the mouthguard can nestle particularly well against the shape of the face. In addition, a comparatively large filter area is also made possible in order to enable the highest possible air throughput despite the filter effect of the first filter layer and thus not to restrict breathing too much. Optionally, the shape can have an hourglass-like “extension” on both ends, i.e. H. have outward-widening ends. These can form the broadest possible connection edge for the straps.

The shape of the first filter stack is preferably selected such that a plurality (also: plurality) of first filter stacks, which are lined up in the longitudinal direction, and a plurality of second and third filter stacks, which are likewise lined up in the longitudinal direction, and by half the longitudinal extent of the first filter stack are offset in the width direction to fit the first filter stack, a filter stack track with straight longitudinal edges and a width of three times half the width of the first filter stack results. In this case, the end extensions described above are not provided. With this design, it is advantageously possible to “nest” an (in particular “endless”) roll of filter material with a multiplicity of first, second and third filter stacks into a cutting pattern, that is to say specify this distributed on the roller conveyor, and to minimize waste. The widths of the first, second and third fiber stacks are preferably adapted such that a plurality (ie an integer multiple) of the filter stack webs mentioned above can be cut from a roller conveyor, again such that the entire width of the roller conveyor is fully used. This can be achieved, for example, with an outer contour of the first filter stacks hanging in a row, which is described on the filter stack path by two periodic wavy lines, the two wavy lines (preferably cosine curves) by half their period length (in the case of the cosine curves as shifted against each other in particular in the longitudinal direction and offset from one another in the width direction of the filter stack path such that a coherent series of second and third filter stacks is formed on the left and right of the two wavy lines. If the filter stack path is first cut along the two wavy lines - for example by means of a laser beam cutter, ultrasonic cutter, a heated cutting knife, scissors or the like - this results in three paths with adjacent first filter stacks (in particular between the two wavy lines) and the second and third filter stacks, which, with a suitable choice, in particular as described above, of the width of the filter stack path and of the first filter stack, in turn correspond to a first filter stack cut in half. The The respective webs are then cut off at their narrowest points transversely to the longitudinal extent and thus result in the blanks of the respective first, second and third filter stacks. This pattern is also an independent invention.

The length of the respective first, second and third filter stacks (ie their periodicity when nesting) is preferably between 20 and 22 centimeters, preferably between 20.5 and 21.5 centimeters, preferably 21 centimeters. The maximum width of the first filter stack is 6 to 14 centimeters, preferably 8 to 12 centimeters (half the width is therefore 3 to 7 or 4 to 6 centimeters). Especially in the case of the wavy line - this can in principle also be formed by a polygonal train, but which has comparable properties to the above-mentioned cosine curve with regard to its periodicity - the amplitude is between 1 and 4 centimeters, preferably between 1.5 and 2.5 Centimeter.

With the parameters mentioned above, it is advantageously possible to cut out three of the filter stack webs described above from a roll of nonwoven semifinished product that is currently commercially available and also provided by the authorities, making full use of the roll width (of about 40 centimeters), and in turn the three of these Paths of first, second and third filter stacks.

In a preferred embodiment, the first, the second and the third filter stack have a second filter layer to be worn facing away from the body of the user in the intended wearing state. This is made of fibers with a diameter between 5 and 20 micrometers. This second filter layer assumes a mechanical support and protection function for the first filter layer. Furthermore, the second filter layer also serves for filtering comparatively coarse particles, which could lead to a comparatively quick blockage of the first filter layer.

In a further preferred embodiment, the respective first and / or second filter layer is electrostatically charged. This enables comparatively small particles to adhere and filter to the fibers of the respective filter layer. This advantageously increases the filtering performance. This preferably allows the mouthguard to be classified in the FFP2 or FFP3 category.

In an expedient embodiment, the mouthguard is designed, in particular in comparison to previously conventional FFP2 and FFP3 masks, valve valves. This enables third parties to be protected against unfiltered exhaled air escaping through a valve.

In a further expedient embodiment, the (respective) first filter layer is formed by a fleece produced by the meltblowing process (a so-called “meltblown” fleece). The optionally, in particular preferably present, second filter layer is formed by a spunbonded nonwoven.

In particular, the first and second filter layers of each filter stack are connected to one another over their entire surface, for example embossed with one another. This advantageously increases the mechanical stability of the respective filter stack.

In a further expedient embodiment, the respective filter stack is made of an SMS nonwoven, ie. H. a nonwoven fabric formed from a stack sequence of spunbonded fabric, meltblown nonwoven fabric and spunbonded nonwoven fabric, which is currently made available by the authorities for the local manufacture of mouth-nose masks. In particular in the event that the respective first filter layers lie directly on top of one another in order to be connected to one another in a simple manner by supplying heat, at least in the edge region, but preferably over the entire surface of the respective filter stack, a layer of spunbonded fabric is removed from the SMS nonwoven fabric. This layer of spunbonded fabric is “stripped” by the SMS composite (or SMS nonwoven) during the manufacture of the mouthguard.

In a preferred embodiment, the respective first filter layer of the respective first, second and third filter stack is plasticized in the edge region by the thermal joining and is integrally joined, in particular welded or embossed, to the corresponding other first filter layer. In particular, the respective first filter layer is thus melted in the edge region during production and connected to the other, likewise melted first filter layer lying thereon.

In the preferred case that each filter stack also has the second filter layer, in a preferred embodiment this is not plasticized (melted) during thermal joining and at least partially embedded in the respective plasticized first filter layer in the edge region. In particular, the fibers of the second filter layers in the edge region are surrounded by the material of the melted fibers of the first filter layers and / or wetted and thus glued. The respective first filter layer thus forms a kind of binder for the filter stacks in the edge area.

In an expedient embodiment, the (respective) first filter layer is formed from a polypropylene with a low melt viscosity. The optional second filter layer is optionally made of a higher polypropylene Melt viscosity (and preferably also increased melting point), another plastic with a higher melting point than the first filter layer, a copolymer or various plastics.

In particular (i.e. during the joining process), the first, second and third filter stacks are thermally joined in a hot stamping process by means of an embossing stamp lying in the edge region (preferably closed in a circular manner). Optionally, the structure of the three fiber stacks is clamped with an embossing die or at least loaded (preferably at about 6 MPa) and placed in an oven. Alternatively, a heated stamp is used. The embossing temperature is (in the case of the polypropylene described above) in particular between 150 and 165 degrees Celsius, preferably 155 degrees Celsius. In particular, these temperature values can vary by up to 10 degrees Celsius depending on the system technology used, an optional (separating) material between the stamping die and the filter stacks, positioning of a thermal sensor, a heating element, material of the stamping stamp, etc. Optionally, the embossing stamp can also have a cutting edge (particularly if the nesting and cutting described above is not used) and cut out the spindle shape described above from an approximately rectangular fleece blank during embossing. Pruning can also be carried out after (in particular thermal) joining.

As an alternative to hot stamping, ultrasonic welding can also be used. The sonotrode preferably has a contour corresponding to the edge area. In the case of ultrasonic welding in particular, the SMS nonwoven fabric can also be used with all filter layers for the respective filter stack.

In particular in the event that the embossing step takes place in an oven, a separating film is preferably inserted between the first and the second and third filter stacks so that the first filter layers apart from the edge region are prevented from sticking together. Further expediently, the surface of the respective first filter layer is smoothed using this separating film and the heat introduced during the thermal joining, and in particular also a flat pressure.

In an expedient embodiment, the mouthguard has a manually plastically deformable nose piece in order to be able to adapt the mouthguard to the contour of the nose and optionally also the cheeks. The nose piece is in particular a wire or sheet metal piece - preferably comparable to a sealing strip for sealing (usually food) bags. This nose clip is (or is glued in the course of the manufacturing process) in particular by means of hot glue to the outside of the second filter stack arranged above the dividing line in the intended wearing state, preferably to its second filter layer.

In a further expedient embodiment, the or the respective holding band is connected to the filter stacks in the edge region. Preferably, the respective holding tape or tapes is glued, welded, sewn and / or stapled to the edge area (for example using hot glue). Preferably, two tether ends are tied to each longitudinal end. The holding straps can run in one piece continuously to the other longitudinal end of the filter stack or be divided so that a total of four holding straps are present.

In a further expedient embodiment, the respective holding strap or straps is adjustable in length by means of a clamp. Each tether has, for example, a length of 15 to 40 centimeters, in particular between 25 and 30 centimeters, and a width of 3 to 15, in particular around 10 millimeters. In a simple version, the clamps are a plate with four slots, a retaining band section coming from a longitudinal end of the filter stack being fed back through a slot and another. As a result, the length can be shortened by a simple pull on the tether and a clamping effect can be exerted on the tether. Alternatively, the clamp can also be designed as a tape stopper with a push button or the like.

In a preferred embodiment, the or the respective tether is designed as an elastic band. A meltblown fleece made of a thermoplastic polyurethane ("TPU") is preferably used for this.

The method according to the invention for producing the mouth-nose mask described above is characterized (in particular in addition to the above description) by the features listed below:

1. A method of manufacturing an oral nose mask, according to the method
   • a first filter stack is provided which has at least one first filter layer formed from fibers with a diameter of less than 5 micrometers, the first filter stack having an elongated shape,
   • - A second and a third filter stack is provided, which are structurally identical to the first with respect to the or the respective filter layer Are filter stacks, the second and third filter stacks placed alongside one another in a longitudinal dividing line simulate the shape of the first filter stack, wherein
   • - The second and the third filter stack placed on the first filter stack, preferably with their respective first filter layer on the first filter layer of the first filter stack and connected to it in an edge region running around the shape of the first filter stack, in particular integrally, preferably thermally joined , become, and
   • - At least one elastic holding band for fixing the filter stack on the head is attached to one of the three filter stacks.
2. B Procedure according to A , wherein the respective first filter layer of the respective first, second and third filter stack is plasticized in the edge region with the introduction of heat and is thereby integrally joined to the corresponding other first filter layer.
3. C procedure according to B , wherein a separating film is inserted during the thermal joining process between the first filter stack and the second and the third filter stack. This advantageously prevents the first filter layers from sticking together within the edge region, that is to say in the area spanned by the edge region.
4. D procedure according to A , B and or C. , wherein a “meltblwon” fleece made of polypropylene with a low melt viscosity is used for the respective first filter layer, in particular wherein each filter stack has a second filter layer made of a material with a higher melting point.
5. E procedure according to B , C. and or D , for thermal joining to the edge area, in particular by means of an embossing die, a joining pressure between 5 and 7 MPa, in particular 6 MPa and a joining temperature between 150 and 165 degrees Celsius, in particular 155 degrees Celsius, for a duration of 1 to 60, is preferably applied for 1 to 20 seconds.
6. F procedure according to A , B , C. , D and or E , wherein a filter stack path with three times the width and half the width of the first filter stack is used to provide the first, second and third filter stacks, the filter stack path being cut along two periodic wavy lines around its for a plurality of first filter stacks which are connected to one another in series half the length of the period shifted in the longitudinal direction against each other and offset in the width direction of the filter stack path such that a coherent series of second and third filter stacks is formed to the left and right of the two wavy lines. In particular, this “cutting pattern” or nesting of the individual blanks on the filter stack path or the entire roll described above represents an independent invention.
7. G procedure according to A , B , C. , D , E and or F , an SMS composite being stripped around a spunbonded nonwoven layer to provide the first, second and third filter stacks. In particular, the filter stacks are placed on top of one another in the order SM-MS. A non-stick coated stamp is preferably used as the stamp or a separating film is placed between the stamp and the filter stack.

The manufacturing method is an independent invention, but it also uses the physical features described above and below and has the same advantages.

• 1 in einer schematischen Explosionsdarstellung Elemente zur Fertigung einer Mund-Nasen-Maske,
• 2 in einer schematischen Draufsicht einen Maskenkörper nach dessen Fertigung,
• 3 in Ansicht gemäß 2 die Mund-Nasen-Maske in einem teilweise assemblierten Zustand,
• 4 in einer schematischen Seitenansicht die Mund-Nasen-Maske in einem bestimmungsgemäßen Tragezustand am Kopf einer Person, und
• 5 in einer schematischen Draufsicht einen Rollenabschnitt eines Vliesstoffs mit darauf genesteten Bestandteilen der Mund-Nasen-Maske.

An exemplary embodiment of the invention is explained in more detail below with reference to a drawing. In it show:

• 1 in a schematic exploded view elements for the manufacture of a mouth-nose mask,
• 2nd a schematic plan view of a mask body after its manufacture,
• 3rd in view according to 2nd the mouth-nose mask in a partially assembled state,
• 4th in a schematic side view the mouth-nose mask in a designated wearing state on the head of a person, and
• 5 a schematic plan view of a roll section of a nonwoven fabric with components of the mouth-nose mask nested thereon.

Corresponding parts and sizes are always provided with the same reference symbols in all figures.

In 1 are schematically several elements for the manufacture of a mouth-nose mask (see also 2-4 ), briefly referred to as "mouth guard 1". An in 2nd shown filter body, also as a mask body 2nd is made up of three elements. This is a first filter stack 4th with a lenticular shape and a second and third filter stack 6 respectively. 8th that along a straight dividing line 10th put together the shape of the first filter stack 4th surrender.

The first, the second and the third filter stack 4th , 6 and 8th have a first filter layer 12 on that in 1 in the case of the first filter stack 4th the visible top and in the case of the second and third filter stacks 6 and 8th forms the underside, not shown. This first filter layer 12 is formed by a meltblown fleece made of polypropylene with fibers with a fiber diameter of less than 5 micrometers. In addition, the three filter stacks have 4th , 6 and 8th also a second filter layer 14 , in the 1 in the case of the second and third filter stacks 6 and 8th the visible top forms in the case of the first filter stack 4th accordingly the invisible underside. The second filter layer 14 is made of a spunbonded fabric, in this case also made of a polypropylene, in particular with a higher melt viscosity than the first filter layer 12 , educated. The fiber diameter of the second filter layer 14 is between 5 to 20 micrometers.

The second filter layer 14 forms in the intended final production condition and wearing condition (see 4th ) an outside and thus a support and protective layer for the first filter layer 12 .

For the production of the mask body 2nd becomes the first filter stack 4th designed, the two second and third filter stacks 6 and 8th positioned so that it is on the dividing line 10th comparable to each other like a mirror line. Then there is a stamp 16 at an embossing temperature of 155 degrees Celsius, a joining pressure on an edge area 18th , which is closed in a ring around the first filter stack 4th circulates (s. 2nd ), applied, for example in an oven. Because the respective first filter layer 12 Designed as a meltblown fleece, the polypropylene used for this has a lower melt viscosity and also a lower melting point than the second filter layer 14 on. The embossing temperature of 155 degrees Celsius is chosen so that the second filter layer 14 is not plasticized. The first filter layers lying on top of one another thereby connect 12 cohesive and the fibers of the second filter layers 14 are in the material of the first filter layers 12 embedded.

In the present exemplary embodiment, the above-mentioned stamping step is carried out in the furnace. To prevent the first filter layers 12 over the edge area 18th going beyond - ie within the respective areas of the first, second and third filter stacks 4th , 6 or 8th - stick together, between the first filter stack 4th and the two filter stacks 6 respectively. 8th a release film 20th inserted (and removed after embossing). The release film 20th is also lenticular and smaller in size than the first filter stack 4th executed so that they are flat within that of the die 16 not embossed inner surface.

For embossing, a joining pressure of 6 MPa is maintained for approximately 15 seconds in the present exemplary embodiment. After the embossing, the release film 20th away.

Then in the marginal area 18th four elastic straps 22 glued and then in pairs with one clamp each 24th connected. The clamps 24th are used for length adjustment when putting on the mouthguard 1 . It also applies to the second filter layer 14 of the second filter stack 6 a wire strip 26 glued, which is plastically deformed when applied to the second filter stack 6 Apply as flush as possible to the nose and cheeks.

To do this, the second and third filter stacks are used first 6 and 8th along the dividing line 10th opened upwards or downwards (see arrows 28 in 3rd ) and then placed over the mouth, nose and chin. Then the straps 22 placed over the head and pulled tight (s. 4th ). The mask body 2nd by opening the second and third filter stacks 6 and 8th bent up in a bag or cup shape and already fits well to the contours of the face.

In 5 is a pattern for a roller conveyor 30th shown a nonwoven, by means of which the roller conveyor 30th is used over its width with as little waste as possible. On the roller conveyor 30th there are several wavy lines, here specifically six, in the form of cosine curves y ₁ , ... y ₆ given. The cosine curves y ₁ , ... y ₆ are arranged in pairs in the present embodiment offset by 180 degrees in the longitudinal direction to each other. According to the representation 5 gives x the longitudinal coordinate of the roller conveyor 30th and y the latitude coordinate of the roller conveyor 30th at. The parameter a again gives half the width of the first filter stack 4th and thus the width of the second and third filter stacks 6 respectively. 8th at. The parameter b again gives the amplitude of the cosine curves y ₁ , ... y ₆ at. The size w gives the width of the roller conveyor 30th at.

$$y_2\left(x\right)=2a+\frac{b}{2}+\frac{b}{2}\text{cos}\left(\frac{2\pi }{L}x\right)$$

$$y_3\left(x\right)=y_1\left(x\right)+3a$$

$$y_4\left(x\right)=y_2\left(x\right)+3a$$

$$y_5\left(x\right)=y_1\left(x\right)+6a$$

$$y_6\left(x\right)=y_2\left(x\right)+6a$$

Starting from one at the beginning of the roller conveyor 30th , specifically a corner, the origin set in the present exemplary embodiment are the cosine curves y ₁ , ... y ₆ according to the following scheme: $$y_1\left(x\right)=a-\frac{b}{\mathrm{2nd}}-\frac{b}{\mathrm{2nd}}\text{cos}\left(\frac{\mathrm{2nd}\pi }{L}x\right)$$

$$y_{\mathrm{2nd}}\left(x\right)=\mathrm{2nd}a+\frac{b}{\mathrm{2nd}}+\frac{b}{\mathrm{2nd}}\text{cos}\left(\frac{\mathrm{2nd}\pi }{L}x\right)$$

$$y_{\mathrm{3rd}}\left(x\right)=y_1\left(x\right)+\mathrm{3rd}a$$

$$y_{\mathrm{4th}}\left(x\right)=y_{\mathrm{2nd}}\left(x\right)+\mathrm{3rd}a$$

$$y_5\left(x\right)=y_1\left(x\right)+6a$$

$$y_6\left(x\right)=y_{\mathrm{2nd}}\left(x\right)+6a$$

In the 5 Dotted lines shown in the x-direction limit filter stack paths 32 against each other. One filter stacking path each 32 corresponds to three times half the width a . This is chosen so that from the roller conveyor 30th in the present embodiment 3rd Filter stacking lanes 32 flush from the roller conveyor 30th can be cut. It is $$w=\mathrm{3rd}\ast \mathrm{3rd}a$$

Then the filter stacking lanes 32 along the cosine curves y ₁ , ... y ₆ cut and then along the dotted lines drawn in the y direction. This results in the filter stack 4th (between the cosine curves y ₁ and y ₂ , y ₃ and y ₄ such as y ₅ and y ₆ ) such as 6 and 8th (between one of the cosine curves y ₁ , ... y ₆ and one of the longitudinal lines) each with the length L . The filter stacks 6 and 8th show the areas A and B on. These areas A and B result along their straight cut edge - at least within one of the filter stack paths 32 - again the area C. .

At the roller conveyor 30th it is an SMS nonwoven. In an optional embodiment, one of the spunbonded layers is removed before the processing described above, so that only one “SM nonwoven” is present, which is the fiber stack described above 4th , 6 and 8th forms.

The parameters a and b can also in an optional embodiment for each of the cosine curves y ₁ , ... y ₆ vary. The individual filter stack tracks can also be optionally selected 32 and the associated pairs of cosine curves y ₁ , ... y ₆ be different, in particular of different widths, for example to form different mask sizes.

The object of the invention is not limited to the embodiment described above. Rather, other embodiments of the invention can be derived by the person skilled in the art from the above description.

Reference symbol list

1

Mouthguard

2nd

Mask body

4th

Filter stack

6

Filter stack

8th

Filter stack

10th

parting line

12

Filter layer

14

Filter layer

16

Embossing stamp

18th

Edge area

20th

Release film

22

Tether

24th

Clamp

26

Wire strip

28

arrow

30th

Roller conveyor

32

Filter stack track

a

half width

A

area

b

amplitude

B

area

C.

area

L

length

w

width

y ₁ , ... y ₆

Cosine curve

Claims (18)

Mouth-nose mask (1), comprising - a first filter stack (4) which has at least a first filter layer (12) formed from fibers with a diameter of less than 5 micrometers, the first filter stack (4) having an elongated shape, a second and a third filter stack (6, 8), which are structurally identical to the first filter stack (4) with respect to the respective filter layer (12, 14), wherein the second and third filter stacks (6, 8) placed along a longitudinal dividing line (10) simulate the shape of the first filter stack (4), - at least one retaining strap for fixing the filter stacks (4, 6, 8) to the head, whereby - The second and third filter stacks (6, 8) are placed on the first filter stack (4) and are connected to one another in an edge region (18) that runs around the shape of the first filter stack (4). Mouth-nose mask (1) Claim 1 The second and third filter stacks (6, 8) with their respective first filter layers (12) are placed on the first filter layer (12) of the first filter stack (4). Mouth-nose mask (1) Claim 1 or 2nd , The second and third filter stacks (6, 8) in the edge area being connected to the first filter stack (4) in a materially bonded manner, in particular thermally joined. Mouth-nose mask (1) according to one of the Claims 1 to 3rd , In the intended state of wear, the dividing line (10) is arranged at least approximately parallel to the transverse plane of a user, the second filter stack (6) arranged above the dividing line (10) being opened to the top and with its first filter layer (12) on the nose of the user User rests, and wherein the third filter stack (8) arranged below the dividing line (10) has opened to the underside and rests with its first filter layer (12) under the chin of the user. Mouth-nose mask (1) according to one of the Claims 1 to 4th , wherein the first filter stack (4) has a spindle-like shape, in particular the shape being selected such that a plurality of first filter stacks (4) are lined up in the longitudinal direction and a plurality of second and third filter stacks (6, 8) by half the longitudinal extent of the first filter stack (4) offset in the width direction to match the first filter stack (4), a filter stack path (32) with straight longitudinal edges and a width of three times half the width (a) of the first filter stack (4) results. Mouth-nose mask (1) according to one of the Claims 1 to 5 The first, the second and the third filter stack (4, 6, 8) have a second filter layer (14) to be worn away from the body of the user in the intended wearing state, which is formed from fibers with a diameter between 5 and 20 micrometers . Mouth-nose mask (1) according to one of the Claims 1 to 6 , wherein the respective first and / or second filter layers (12, 14) are electrostatically charged. Mouth-nose mask (1) according to one of the Claims 1 to 7 , wherein the first filter layer (12) is formed by a meltblown nonwoven fabric and wherein the optionally present second filter layer (14) is formed by a spunbonded fabric. Mouth-nose mask (1) according to one of the Claims 6 to 8th , wherein the first and second filter layers (12, 14) of each filter stack (4, 6, 8) are connected to one another over their entire area. Mouth-nose mask (1) according to the Claims 8 and 9 , wherein the respective filter stack (4, 6, 8) is formed from an SMS nonwoven fabric by removing a layer of spunbonded fabric. Mouth-nose mask (1) according to one of the Claims 2 to 10th , wherein the respective first filter layer (12) of the respective first, second and third filter stack (4, 6, 8) is thermally joined and plasticized in the edge region (18) and is integrally joined with the corresponding other first filter layer (12). Mouth-nose mask (1) Claim 11 The respective second filter layer (14) is not plasticized during thermal joining and is at least partially embedded in the plasticized first filter layer (12) in the edge region (18). Mouth-nose mask (1) according to one of the Claims 1 to 12 The first filter layer (12) is formed from polypropylene with a low melt viscosity. Mouth-nose mask (1) according to one of the Claims 3 to 13 The first, second and third filter stacks (4, 6, 8) are thermally joined in a hot stamping process by means of a stamp (16) resting in the edge region (18). Mouth-nose mask (1) according to one of the Claims 3 to 14 The surface of the respective first filter layer (12) is smoothed using a separating film (20) placed between the first and the second and third filter stacks (4, 6, 8) and the heat introduced during thermal joining. Mouth-nose mask (1) according to one of the Claims 1 to 15 , with a manually plastically deformable nose piece, in particular a wire or sheet metal piece (26), which is applied in particular by means of hot gluing to the outside of the second filter stack (6) arranged above the dividing line (10) in the intended wearing state. Mouth-nose mask (1) according to one of the Claims 1 to 16 , wherein the or the respective tether (22) in the edge region (18) with the Filter stacks (4,6,8), in particular by means of hot gluing, is connected. Mouth-nose mask (1) according to one of the Claims 1 to 17th , wherein the or the respective tether (22) is adjustable in length by a clamp (34).

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