The present invention generally relates to universal face masks, both for the benefit of the wearer and those in proximity to the wearer. The masks are formed into a complex shape by folding fabric and holding the shape in place with optional fasteners. The masks optionally include one or more replaceable filters.
In the area of face masks or face coverings, there are many designs that follow similar sew patterns that are hand sewn, sewn using industrial sewing machines, or no sewn designs. Overall, global face mask market is comprised on different types of face masks: hospital mask, dental mask, industrial mask, veterinary mask, and others.
Face masks reduce the risk of transferring infectious bacteria, virus and the like between one person to another or in any context where nose, mouth and eye protection may be indicated. Face masks cover an area over the mouth of the wearer.
The common type of fabric used in many face masks and face coverings is typically soft lightweight fabric. Face masks made from spandex, neoprene, or other similar synthetic material are not common in the face masks market.
On the functional side, formed masks, when fitted properly, provide a close fit to the face to prevent air from bypassing the mask filter material. N95 masks, and other small-particle masks, have a formed cup shape to provide ample breathing room. Many medical and construction masks come with a metallic nose bridge element which is bent by the wearer into the custom shape of the nose. Masks are attached to the face either through a single or dual band around the head or two loops that fit behind the wearer's ears. Latex free elastics are an important requirement for healthcare settings.
Nonetheless, there exists a need for face masks that provide an effective barrier to air-borne contaminants such as bacteria and viruses between one wearer and another wearer in public spaces, while still providing for improved design. Making use of materials not commonly used in mask making also aids in supply during times of high demand for masks made from more common materials.
The invention disclosed herein overcomes some of the shortcomings of the prior art by disclosing a flat pattern that requires no sewing but can be folded to form a cup shape to provide a good seal to the face. The folding can be held in place with the use of a permanent or releasable fastening mechanism. In the case of a releasable fastening mechanism, the flat nature of the pattern allows for the mask to be thoroughly cleaned, without any folds or stitches to capture and retain contamination.
The secondary benefit of the releasable fastening mechanism is that it allows other layers to be releasably connected to the face mask. This is particularly useful with single-use disposable filter layers. Many non-woven materials can not be cleaned, as washing damages the filter structure and reduces the efficacy of the filter to capture microbes and particulates.
This hybrid approach—of a reusable mask housing a disposable filter—allows the outer mask to be cleaned between exposures with only the inner filter needing to be replaced. It uses less material and is faster to produce than a fully disposable mask. Further, even the reusable portion of the proposed design of the mask can be made from minimal material and assembly effort, for maximum scalability and minimal reliance on suppliers to manufacture the final product.
The folding of a semi-rigid material in the face mask allows the cup shape to hold the formed shape and not collapse in on the face of the wearer. The semi-rigid material can be the outer layer itself if made of a material that while stretchy also exhibits some stiffness, for example 1.5 mm stretchy neoprene. It could be a lighter, thinner fabric with a tight weave. It can also be the disposable inner filter layer, if that filter material has a reasonable rigidity, for instance >60 gsm (grams per square meter) non-woven spunbonded polypropylene. In addition, a half twist of 180 degrees on each ear loop when donning the face mask provides compressive forces on the face of the wearer, on top of the nose bridge and under the chin. This compression comes from the tension in the material on top of the nose being pulled under the bottom of the ear and the tension in the material under the chin being pulled over the top of the ear. Both tension forces are enhanced, and in most cases created by, the half twist applied to each ear loop. The compressive forces enhance the seal of the mask to the face of the wearer. The folding of the semi-rigid material in the face mask can be configured to create a shape that matches the shape formed by the mask when donned with a half twist in each ear loop.
Alternatively, an additional layer can be added to the face mask that is reusable. The semi-rigid layer made from denim, cotton twill, duck canvas, or similar material can have the added benefit of improving the filtration efficacy while also supporting the face mask shape away from the wearer's face. These materials often experience fraying along the edges unless the weave ends are captured. Ways of capturing the weave ends of the fabric along the edges include: overlock stitching (serger stitch), taping, gluing, bonding interfacing, melting, folding, and hemming.
When a semi-rigid layer is added as an inner layer, it allows the outer stretchy layer to apply compressive force on the face mask, including the semi-rigid layer, to provide a good seal of the mask to the wearer's face. This has been found by researchers at Northeastern University to maximize the airflow through the mask, instead of around the edges of the mask, greatly improving the efficacy. The team, led by Loretta Fernandez, found that a 3M surgical mask went from blocking 75% of small particles to 90% with the addition of a tight outer stretchy layer.
In some embodiments, the face mask comprises an outer layer of stretchy fabric, for example a 94% polyester/6% spandex blend with a weight of 230 gsm and an inner layer of a nonwoven semirigid filter material, for instance spunbonded polypropylene with a weight of 60 gsm. The two pieces are cut using a die press, die roll, fabric cutter, laser cutter, digital cutter, or other similar means. The pattern includes four small holes for releasable fastening mechanisms, such as button snaps, to be attached through the holes for quick assembly with accurate placement. Each side of the face mask has two holes that axially align when folded into the desired shape. A single fastening mechanism is then inserted into the aligned holes. The outer layer being a synthetic fabric allows for a laser to cut the material and melt the edges at the same time, preventing fraying to some degree.
The use of a single fastening mechanism for the hole pair on each side of the mask can be repurposed for releasably attaching the inner filter material to the inside of the face mask.
In an additional embodiment, the releasable fastening mechanism is button snaps where each half of one button snap assembly is press fit through each of the two hole pairs. This forms two separate button snap sets on each side of the face mask that, when connected, fold the fabric symmetrically across the left and right side of the wearer's face. The resulting shape is a cup that stands out from the mouth for comfort. It also creates a shape that fits the standard curves of a face, creating a tight fit to the nose bridge without the need for a metallic shaping wire while simultaneously creating a tight fit to the cheeks and chin.
In using a pair of button snaps, the filter material is releasably attached to the face mask by the addition of two holes on each side of the filter, or two hole pairs, that line up with the button snaps. In this way, the inner layer is folded in a similar fashion to the outer layer. It also allows the filter material to be captured by axially aligning and inserting the filter holes onto the button snaps before closing the button snaps shut. Alternatively, the filter could have a single hole on each side of the mask to simplify the insertion process, so that it is fully captured while still reasonably positioning the filter in the mask.
In an alternate embodiment, the face mask has additional holes that the fastening mechanism connects through, either releasably or permanently. This allows the mask to curve further and reach tightly under the chin of the wearer. When releasably, such as with button snaps, the fastening mechanism is first press fit into certain holes, then lined up with additional holes through which the button snaps are fastened. When permanently, multiple holes are lined up before the button snap halves are press fit in position, thus capturing two or more holes with one button snap half. Fastening the button snap completes the forming of the mask shape.
In an additional embodiment, the inner layer is a washable layer, such as denim, stretchy denim, cotton twill, jersey cotton, neoprene, double knit, ponte di roma, or synthetic blend. Heavier fabrics have been shown to still have a reasonable ability to capture small particles.
In a further embodiment, the inner washable layer is a twill denim of 8 oz weight (270 gsm) with a blend of 71% cotton, 27% polyester, and 2% spandex.
In an additional embodiment, the outer layer is a 4-way stretch fabric of 80% nylon and 20% spandex with a weight of 200 gsm.
In an additional embodiment, the inner filter layer is a melt-blown polypropylene with a weight between 20-34 gsm.
In an further embodiment, the inner filter layer of melt-blown polypropylene is in addition to a second or third inner layer.
In some embodiments, the face mask attaches behind the wearer's ears. This can be with a single loop, on each side of the mask, that is sized to fit a range of head shapes and sizes. Multiple mask sizes could be offered for different head sizes. Alternatively, the ear loops could be adjustable to be sized by the wearer to fit the full range of head sizes. This could be accomplished with slits or holes in the ear loop through which the releasable fastening mechanism could be closed.
In an alternate embodiment, the face mask has a band that wraps around the head of the wearer. This would have the benefit of not putting pressure on the back of the ears. If the band were elastic, it can stretch to accommodate a range of head sizes and shapes. There could additionally be elongated ear holes in the band that allow the wearer to keep the mask firmly in place on the wearer, using the tops of the ears, but not the backs of the ears, where the elongation allows the mask to fit a variety of head sizes.
In a further embodiment, the band is adjustable to be sized to the size of the head of the wearer. With two ends of the band, one on either side of the fask mask, this could possibly be done by simply twisting or tying the two ends together and pulling tight to the appropriate fit.
In an alternate embodiment, the band that wraps around the head of the wearer is integral to the outer layer of the face mask. This could be made from the same piece of fabric and simply be part of the pattern for the outer layer.
In a further embodiment, the outer layer that wraps around the head of the wearer could overlap in the front of the face, so that the outer layer also comprises the inner layer. In such a way, the releasable fastening mechanism could be the element that either permanently or releasably attaches the inner part to the outer part of the wrap.
In a further embodiment, an additional inner layer of filter material could be applied permanently or releasably. When attached releasably, it could be captured by axially aligning holes with the locations of the fastening mechanism and closing the fastening mechanism trapping the filter layer in the mask.
In an alternative embodiment, the inner and outer part of the wrap could create a pocket into which an additional filter layer could be inserted. The space between the two layers could be the pocket, or the outer or inner layer could be folded over to create the pocket out of that layer.
In an alternate embodiment, the face mask has more than one band that wraps around the head of the wearer to keep the mask in place. This would have the benefit of allowing the mask to be best positioned on the face of the wearer and apply more even pressure to keep the mask sealed well to the face.
In a further embodiment, the more than one bands that wrap around the head of the wearer are adjustable in length. This would also allow for better fitting the mask to the face with potentially improved wearer comfort.
The present invention is directed towards an improved design of and manufacturing techniques for a face mask. With reference to
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The inner filter layer 709 is inserted into the mask outer layer 702 by aligning the upper holes 722 and lower holes 723 on both the left and right sides of the mask. The upper holes 722 are aligned when the inner filter upper tabs 721 are folded down along the folding line 719. The filter layer tabs 721 are optional. If they are not included in the embodiment, the inner filter layer 709 only attaches by having the lower holes 723 align with the fastening mechanism passing through the holes and fastening to trap the inner layer 709 to the outer layer 702.
A separate embodiment of the mask is shown in
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The resulting mask can be seen in
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A separate embodiment could have an outer layer, without an inner layer, and extend around the entire circumference of the head. With reference to
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An additional embodiment of the mask, shown from the front in
The resulting shape can be seen in
Multiple fasteners could also allow there to be an upper fold in the mask and a lower fold in the mask, to better shape the mask to the profile of the face and protect further under the chin. The lower fold could also be accomplished with only one fastener, if there were multiple holes that the fastener were assembled through. For instance, in the case of a button snap, the spike on the male component could pass through three holes spaced in the material to create a fold. This would provide an additional embodiment of the mask, as shown in
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Additionally, an optional replaceable filter layer 3032 can be added to the mask. This is inserted between the outer layer 3002 and the inner layer 3009. It is positioned, and remains in place during use, by use of notches that partially fit around the round button snaps, creating a loose mating on each notch, but a robust mating when combined. The upper notch 3033 fits around the upper button snap male 3018 and the lower notch 3034 fits around the lower snap male 3013.
This application claims priority to U.S. Provisional Application No. 63/028,479 filed May 21, 2020, entitled “FASTENER FORMED FACE MASK,” which is incorporated herein by reference in its entirety.
Number | Date | Country | |
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63028479 | May 2020 | US |