TWM622353U - Flat folding mask - Google Patents

Abstract

The present invention provides mask capable of enabling the mask to be folded into a flat package before use and unfolded into a three dimensional configuration when placed on the face of the wearer. The utility model discloses a mask, comprising of a mask body and a connecting strap for wearing the mask body on the face. The mask body has an upper pleat and a lower pleat. The interior part of the upper pleat folds from top to bottom, and the lower pleat folds from bottom to top. And the upper pleat is located on top of the lower pleat. The upper and lower edges of the mask body are oval shaped, with main body is wide in the middle and narrows from the middle to the two sides. A welding embossed pattern is added to both sides to increase the strength of the two sides of the main body. A pleat-free surface is formed in the middle of the body, which is close to the surface of the nose to create a space between the mouth and the nose that is conducive to air circulation.

Description

Flat Folding Mask 【Cross-reference of related applications】

This creation claims priority to US Patent Provisional Application No. 63/087,161, filed on October 2, 2020, and US Patent Provisional Application No. 63/122,058, filed on December 7, 2020, each application The entire contents of which are incorporated herein by reference.

This creation is about a new type of flat foldable three-dimensional mask.

Masks are widely used in a variety of different applications to protect the user's respiratory system from the intrusion of airborne particles or unpleasant or harmful gases. Masks are generally designed to be worn over the user's mouth and nose to protect the user from harmful substances suspended in the air.

Flat face masks are an indispensable item for everyday use, and there is a particular desire for wearer protection, comfort to wear, and ease of storage. The general flat masks on the market have poor structural sealing effect, which often leads to air leakage on both sides of the mask (near the ear straps), so it cannot provide effective protection for users. In addition, the structure of the flat mask tends to cause the mask to collapse when the user inhales, which in turn causes discomfort and makes it less desirable to wear the mask for a long time.

Therefore, there is a need in the technical field to develop a flat foldable mask that can be folded flat to make it easy to carry, but can still provide excellent breathing tightness and comfortable wearing feeling, and the present invention meets this demand.

In one embodiment, the present creation provides a mask, which includes: at least one layer, which forms a body, the body has a top end, a bottom end, a first end on one side, and a second end on one side; At least one upper pleat above a center of the body, and at least one lower pleat disposed below the center of the body, each pleat extending laterally between the first end and the second end; A first pressure-welded portion at the end and a second pressure-welded portion at the lateral second end, wherein the pressure-welded portions help to make the mask more tightly fastened to a wearer's face; setting At least two internal welds at the first end and the second end, wherein the internal welds secure each pleat to the body of the mask so that when the mask is worn on a user's face it forms a rigid sheet; at least one strap, wherein the at least one strap is welded to the first pressure-welded portion and the second pressure-welded portion, respectively; and a nose clip located near the top end, wherein the nose clip is configured to attach the mask The fold is compliant over the wearer's nose to form a tight fit over the nose area.

In one embodiment, the nose clip includes at least one metal core strip or wire embedded in a plastic strip that is overmolded and configured to form a gap that bridges the nose and provides the fit strength of the mask. In one embodiment, the nose clip is a plastic strip embedded with at least three overmolded metal cores, wherein the metal cores are arranged in parallel in the plastic strip. In one embodiment, the nose clip has a memory function. In one embodiment, the at least one strap includes a soft rubber adjuster to allow the mask to be worn on the face of the user Forms a tight fit. In one embodiment, the at least one strap forms a loop configured to encircle a wearer's head. In one embodiment, the at least one strap forms a loop configured to encircle a wearer's ear. In one embodiment, the strap, the nose clip, and the at least one layer comprise an outer layer and an inner layer. In one embodiment, the at least one layer further includes at least one intermediate layer disposed between the outer layer and the inner layer. In one embodiment, the outer layer, the at least one intermediate layer and a periphery of the inner layer are welded together. In one embodiment, the mask further includes a horizontal plane without pleats formed between the at least one upper pleat and the at least one lower pleat at the center of the body, which is configured to form an air chamber. In one embodiment, the horizontal flat unfolded area straddles a centerline between the bottom of the wearer's nose and the top of the wearer's mouth. In one embodiment, when the ends of the first pressure-welded portion and the second pressure-welded portion are tightened through the at least one strap, the mask completely fits the wearer's face.

In one embodiment, the present invention provides a mask, which includes: an outer layer; one or more middle layers; and an inner layer; wherein each layer includes a body having a substantially oval shape, which has a top, a bottom end, one side facing the first end, one side facing the second end, and comprising at least one upper pleat laterally disposed above a center of the body, and at least one lower pleat laterally disposed below the center of the body, A horizontal plane without pleats is formed between the at least one upper pleat and the at least one lower pleat in the center of the body, which is configured to form an air chamber; a first pressure-welded portion at the lateral first end and a second pressure-welded portion at the lateral second end, wherein the welded ends are both rigid and configured to prevent the mask from being pulled when the mask is pulled and worn on the cheek of a wearer The lateral first end and the lateral second end of the mask are deformed; arranged at least two adjacent to the lateral first end and the lateral second end Internal welds, wherein the internal welds secure each pleat of the mask to the body of the mask so as to form a rigid sheet when the mask is worn on a user's face; at least one strap, wherein the at least one strap are welded to the first pressure-welded portion and the second pressure-welded portion, respectively; at least one of the straps includes an adjuster for a tight fit when the mask is worn on the wearer's face; and a a nose clip located near the top end, wherein the nose clip is configured to bend the mask over the wearer's nose to form a tight fit over the nose area; and wherein when pulled by the at least one strap When tightening the ends of the first pressure-welded portion and the second pressure-welded portion, the body of the mask is completely in close contact with the wearer's face; and wherein the outer layer, the one or more intermediate layers, and the inner layer An outer periphery of the layers is welded together.

500: Flat mask

502: Outer Layer

503: Upper pleat

504: middle layer

505: Lower pleats

506: inner layer

507: Top

508: Strap

509: Bottom

510: nose clip

511: Ontology

512: First side end

514: Second side end

522: Adjuster

540: Peripheral welding point

550: Internal welding point

560: Roughly horizontal welding line

570: Roughly vertical weld line

The following detailed description of the present invention will be better understood by reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the precise arrangements and instrumentalities of the illustrated embodiments.

[Fig. 1] includes Fig. 1A to Fig. 1B and depicts an exemplary flat foldable mask of the present creation. FIG. 1A depicts a front view of an exemplary flat foldable mask of the present creation, and FIG. 1B depicts a rear view of an exemplary flat foldable mask of the present creation.

[Figure 2] depicts the exploded view of a demonstration flat foldable mask of this creation in a flat state.

[Figure 3] depicts an exploded view of an exemplary flat foldable mask of the present creation, which forms a three-dimensional structure during use.

[Figure 4] depicts the rear view of a demonstration flat foldable mask of this creation, It forms a three-dimensional three-dimensional structure when in use.

[Fig. 5] depicts a perspective view of an exemplary flat foldable mask of the present creation, which forms a three-dimensional structure when in use.

[Figure 6] depicts the front view of a demonstration small flat foldable mask of this creation.

[Figure 7] depicts a front view of an exemplary medium-sized flat foldable mask of this creation.

[Figure 8] depicts the front view of a demonstration large-scale flat foldable mask of this creation.

[Figure 9] depicts the front view of an exemplary super-large flat foldable mask of this creation.

[Fig. 10] depicts a front view of an exemplary flat foldable mask of the present creation in a flat state.

definition

It should be appreciated that the drawings and descriptions of the present creations have been simplified to illustrate elements relevant to a clear understanding of the present creations, while many other elements known in the art of respirators and masks have been omitted for clarity. Those of ordinary skill in the art will recognize other elements and/or steps that may be desired and/or required to practice the present invention. However, since such elements and steps are well known in the art, and because they do not contribute to a better understanding of the present invention, Therefore, such elements and steps are not discussed herein. The creation of this disclosure is directed to all such changes and modifications of such elements and methods known to those skilled in the art.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this creation belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, preferred methods and materials are described herein.

As used herein, the following terms respectively have the meanings associated with them in this paragraph.

The article "a" is used herein to refer to one or more (ie, at least one) of the grammatical objects of the article. For example, "an element" means an element or elements.

"About" as used herein, when referring to a measurable value (eg, an amount, a duration of time, etc.), is meant to encompass ±20%, ±10%, ±5%, ±1%, and ±20% from the indicated value. A variation of 0.1% is appropriate for such a variation.

Throughout the disclosure, various aspects of this creation can be presented in scope specifications. It should be understood that the description of the scope specification is for convenience and brevity only and should not be regarded as an inflexible limitation on the scope of this creation. Accordingly, the recitation of a range should be considered to have explicitly disclosed all possible subranges and individual values within that range. For example, recitation of a range such as from 1 to 6 should be deemed to have specifically disclosed subgroups such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc. A range, but also individual numbers within that range, such as 1, 2, 2.7, 3, 4, 5, 5.3, 6, and any whole and partial increments therebetween. This applies regardless of the breadth of scope.

Flat Folding Mask

This creation provides a flat foldable mask, which is configured to solve the problem that the flat mask cannot be effectively protected due to air leakage on both sides, while providing comfort when worn for a long time. In one embodiment, the present invention is configured to provide a pleated face mask that fits perfectly on the wearer's face and meets the N95 standard, whereas traditional pleated face masks cannot fit the wearer completely. face.

Referring now to Figures 1A and 1B, an exemplary flat face mask 500 is shown. The flat mask 500 includes at least one layer, at least one strap 508 , a nose clip 510 , a first lateral end 512 and a second lateral end 514 . Although the straps 508 shown in the drawings are attached to the outer layer 502 of the mask 500, the straps 508 can also be selectively attached to the inner layer 506 of the mask 500, or between the outer layer 502 and the inner layer 506 and other layers. at the location.

2 and 3, an exploded view of an exemplary flat mask 500 is shown. In one embodiment, at least one layer includes an outer layer 502 and an inner layer 506, wherein the outer layer 502 is furthest from the user's face and the inner layer 506 is closest to the user's face. In one embodiment, at least one layer further includes one or more intermediate layers 504 disposed between the outer layer 502 and the inner layer 506 . In one embodiment, the outer layer 502 and the inner layer 506 are made of materials including, but not limited to, fabrics. In one embodiment, the outer layer 502 and the inner layer 506 may be non-woven materials. In one embodiment, the fabric may be a woven material. In one embodiment, the intermediate layer 504 is made of filter material, including but not limited to sheet, cloth, membrane, mesh, woven material, non-woven material, and combinations thereof. In one embodiment, the non-woven material may include, but is not limited to, wet-laid fibers, dry-laid fibers, spunlace fibers, spunbond fibers, meltblown fibers, spunbond meltblown spunbond fibers (SMS), carded fibers , thermoplastic fibers, regenerated fibers and bicomponent fibers (eg sheath core fibers). These non-woven materials may include but not Limited to polyolefins (eg polyethylene and polypropylene), polyesters (eg PET), natural fibers and cellulosic materials. The non-woven material forming the one or more intermediate layers 504 of the flat mask 500 may comprise a mixture of two or more of the aforementioned fiber species.

In one embodiment, the one or more intermediate layers 504 may comprise one or more webs of fine inorganic fibers (eg, glass fibers) or polymeric synthetic fibers. In one embodiment, the one or more intermediate layers 504 may comprise a meltblown fabric. In one embodiment, the melt-blown fabric adopts an electrostatic electret treatment process using electret masterbatch, so as to increase the electrostatic adsorption area of the melt-blown fabric and reduce its ventilation resistance at the same time. This increases the filtering capacity of the respirator, thus extending the life of the respirator.

The outer layer 502 , one or more intermediate layers 504 , and the inner layer 506 each include a top end 507 , a bottom end 509 , and a body 511 . Each layer includes at least one upper pleat 503 at the top end 507, and at least one lower pleat 505 at the bottom end 509, wherein each pleat includes a first fold followed by a second return fold, thereby forming a two-fold structure (FIG. 4) . In one embodiment, the inner fold of the at least one upper pleat 503 is opposite the inner fold of the at least one lower pleat 505 . When viewed from the back, at least one upper pleat 503 faces downwards, and at least one lower pleat 505 has an inner fold facing upwards. Therefore, when the mask 500 is unfolded, since the folding direction of the inner fold of the at least one upper pleat 503 is opposite to the folding direction of the inner fold of the at least one lower pleat 505, the at least one upper pleat 503 is unfolded upward, and the at least one lower pleat 505 expand down. After unfolding, the mask body 511 presents a three-dimensional cup shape, so that both sides of the mask 500 are effectively close to the face.

In one embodiment, at least one upper pleat 503 and at least one lower pleat 505 are fixed together by heat welding. In one embodiment, the mask 500 is at the top 507 and the bottom The end 509 may comprise two pleats, wherein the width between the pleat on the top end 507 and the central position on the body 511 ranges from about 2.5 to 4.5 cm. In one embodiment, the two pleats at the top end 507 and the bottom end 509 can be folded into three layers. Therefore, when viewed from the rear, the mask 500 has four creases.

A horizontal unfolded surface is formed in the middle of the body 511, straddles the midline between the bottom of the nose and the top of the mouth. This creates a lateral wide air chamber left and right to prevent the mask from collapsing when breathing. This effectively reduces the resistance when breathing, allowing the user to wear the mask continuously for a long time.

The body 511 located on the top end 507 and the bottom end 509 has a substantially oval shape with the middle being widest and narrowing toward the first side end 512 and the second side end 514 . After the mask is opened and worn, the width completely covers the user's nose and chin, while completely sealing both sides of the user's face. After opening and wearing the mask, the body 511 of the mask completely covers the user's face, from the nose bridge at the top 507 to the chin at the bottom 509, and at the same time completely closes both sides of the user's cheeks.

In one embodiment, the mask 500 further includes a nose clip 510 located on any one of the outer layer 502, the middle layer 504, and the inner layer 506 or between any two layers near the top 507. In some embodiments, the nose clip 510 may be located near the top end 507 of the inner layer 506 . In one embodiment, the nose clip 510 includes at least one metal core strip or wire that is overmolded into a plastic strip. In one embodiment, nose clip 510 includes three or more metal core strips or wires that are overmolded into plastic strips. In one embodiment, nose clip 510 includes four or more metal core strips or wires that are overmolded into plastic strips. In one embodiment, the nose clip 510 is a plastic strip embedded with four overmolded metal cores, The metal cores are arranged in parallel in the plastic strip. In one embodiment, the overmolded metal core strip or wire embedded in the plastic strip is configured to generate four to five times the clamping force so that the mask 500 can fit completely against the nose. The nose clip 510 may be fabricated using an integral molding process configured to embed the metal core within the plastic. In one embodiment, the nose clip 510 has a memory function. In one embodiment, the nose clip 510 is ISO 10993 compliant and non-irritating to the skin. Since the bending and shaping strength of the nose bridge strip 510 is greater than the rebound tension of the three-layer mask material, adjusting the nose bridge strip 510 can make the mask 500 completely fit the sides of the nose and the face. In one embodiment, the shape of the nose clip 510 can be adjusted to suit different users.

In one embodiment, the strap 508 may be an ear loop (FIG. 4). In this configuration, two straps 508 are used, with at least one strap 508 attached to the first side end 512 and at least one strap attached to the second side end 514, with the first and second sides of each strap 508 The ends form a loop around the user's ear. In one embodiment, the at least one strap 508 may further include a soft rubber adjuster 522 to allow moderate adjustment of the fit of the mask when it is worn on the user's face. For example, moving adjuster 522 along strap 508 adjusts the size of the loop formed by strap 508. The user can move the adjuster 522 to form a comfortable size loop around the user's ear, and can move the adjuster 522 to reduce the size of each strap 508 loop to increase the fit of the mask 500 to the user's face sex. In one embodiment, the at least one strap 508 is elastic. In one embodiment, the at least one strap 508 may be made of any material known to those of ordinary skill in the art, including but not limited to thermoplastic elastomers, elastic polyurethanes, polyisoprene, acetylene-styrene copolymers Wait.

In one embodiment, the at least one strap 508 is at the first side end 512 and the second side end 514 is attached to the outer layer 502 . In one embodiment, at least one strap 508 may form a loop that is configured to form around the user's head (FIG. 5). In this configuration, the at least one strap 508 is attached at one end to the first side end 512 and at the other end to the second side end 514, and the at least one strap 508 can be tied, fastened, or elongated such that the at least one A strap 508 wraps around the user's head so that the mask fits tightly to the user's face. In one embodiment, the mask 500 includes two straps 508 configured to form a loop for encircling the user's head.

In one embodiment, the at least one strap 508 may be an inelastic strap. In one embodiment, the at least one strap 508 can include, but is not limited to, non-woven materials formed by both wet and dry lamination processes, and made of rayon, polyester or similar fibers, polypropylene, polyethylene Or polyester calendered spunbond web and reinforced paper.

In one embodiment, the at least one strap 508 is configured to surround the user's head, so as to improve the tightness between the mask and the user's face, thereby meeting the N95 mask standard. In one embodiment, the at least one strap 508 is configured to wrap around the user's ears to improve the fit of the mask to the user's face to meet the standard of a Class 1 or Class 2 surgical mask.

In one embodiment, the combination of at least one strap 508, nose bridge strip 510, and soft rubber adjuster 522 creates a tight fit, so that the mask 500 complies with N95 certification and provides better protection.

In one embodiment, the outer layer 502, one or more intermediate layers 504, and the inner layer 506 are cut and welded together such that the entire mask is in a flat state prior to use. For example, the periphery of outer layer 502 is welded to the periphery of one or more intermediate layers 504 .

In one embodiment, referring to FIG. 10 , the mask 500 may further include peripheral welding points 540 and at least two inner welding points 550 . In an exemplary embodiment, the mask 500 may have eight internal welds 550 . In one embodiment, at least two internal welds 550 are configured to secure each pleat to the mask body so as to form a rigid sheet when the mask is opened and worn on the wearer's face. In addition, the mask 500 may include pressure-welded portions disposed adjacent to two sides of the mask 500 , the pressure-welded portions including substantially horizontal welding lines 560 and substantially vertical welding lines 570 . The welding embossing lines near the sides of the mask 500 are configured to strengthen the two sides of the body 511 , and at the same time make them smoother and produce a close fit with the user's face. In one embodiment, the width W of the horizontal welding line 560 and the substantially vertical welding line 570 is about 1.5-2.5 cm, preferably 2 cm. In one embodiment, the height of the welding area on the side of the mask 500 varies with the size of the mask. In one embodiment, for a small mask, the height at the widest center is about 50 to 70 mm (FIG. 6). In one embodiment, for a small mask, the width is about 180mm (FIG. 6). In one embodiment, for a small mask, the height of the sides is about 26 to 46 mm (FIG. 6). In one embodiment, for a medium-sized mask, the height at the widest center is about 54 to 74 mm ( FIG. 7 ). In one embodiment, for a medium-sized mask, the width is about 200 mm (FIG. 7). In one embodiment, for a medium-sized mask, the height of the sides is about 31 to 51 mm ( FIG. 7 ). In one embodiment, for a large mask, the height at the widest center is about 64 to 84 mm (FIG. 8). In one embodiment, for a large mask, the width is about 210mm (FIG. 8). In one embodiment, for a large mask, the height of the side is about 44 to 64 mm (FIG. 8). In one embodiment, for an extra-large mask, the height at the widest center is about 68 to 88 mm ( FIG. 9 ). In one embodiment, the oversized For masks, the width is about 230mm (Figure 9). In one embodiment, for an extra-large mask, the height of the sides is about 48 to 68 mm (FIG. 9).

In one embodiment, the two welded ends are rigid and prevent deformation of the ends of the mask 500 when the mask is pulled and worn on the cheek. In one embodiment, when the at least one strap 508 is tightened, the press-fit end allows the body of the mask 500 to completely fit against the face.

These items work together to create a tight fit to the user. As with all masks, a tight fit is essential to protect the user. However, ordinary three-layer masks generally have openings either in the bridge of the nose or in the ear loop area, which cannot effectively prevent the intrusion of droplets. The arc above and below the weld line allows the mask itself to arc when pulled apart, thus limiting the opening of the mask edge. For example, the eight internal welding points 550 on the mask maintain the shape of the mask so that the mask does not expand excessively when unfolded by the user, which would prevent the mask from being tightly fitted.

Referring now to FIG. 10 , in one embodiment, the height of the body 511 is approximately 50 to 105 mm at the widest center. In one embodiment, the mask 500 narrows from the middle toward the first side end 512 and the second side end 514 .

In one embodiment, the mask 500 has contoured curved top ends 507 and bottom ends 509, wherein each curve has a specific arc that, when unfolded, appears to be formed from nine small pieces or facets (Fig. 5), wherein each small piece or facet is a folded surface of the body 511. In one embodiment, the arcs of the body 511 on the top end 507 and the bottom end 509 are asymmetrical. This asymmetrical design is due to the relationship between the size and distance of the nose and mouth of different groups of people, this configuration allows the mask to remain intact even if it is worn by different people A tight fit can be achieved.

In one embodiment, the mask 500 is configured to filter air entering the user's mouth and nose while preventing harmful gases, odors and droplets from entering or leaving the user's mouth and nose.

In one embodiment, the mask 500 can be manufactured by a conventional flat mask machine, and can enter the mass production stage. In one embodiment, the mask 500 can be manufactured with less labor cost, making it affordable for the general public.

The disclosure of each patent, patent application, and publication cited herein is hereby incorporated by reference in its entirety. Although the present invention has been disclosed with reference to specific embodiments, it is obvious that those skilled in the art can devise other embodiments and variations of the present invention without departing from the true spirit and scope of the present invention. The appended claims are intended to be construed to include all such embodiments and equivalent variations and modifications.

500: Flat mask

502: Outer Layer

503: Upper pleat

505: Lower pleats

507: Top

508: Strap

509: Bottom

510: nose clip

511: Ontology

512: Lateral first end

514: Lateral second end

522: Adjuster

540: Peripheral welding point

550: Internal welding point

Claims (18)

A mask comprising: at least one layer, which forms a body, the body has a top end, a bottom end, a first end on one side, and a second end on one side; at least one upper pleat is arranged above a center of the body , at least one lower pleat is arranged under the center of the body, and each pleat extends laterally between the lateral first end and the lateral second end; a first pressure welding part is at the lateral first end, and a second pressure-welding part at the second end, wherein these pressure-welding parts fix the mask on a wearer's face; at least two internal welding points are arranged adjacent to the lateral first end and the side towards a second end position, wherein the internal welds secure each pleat to the body of the mask so as to form a rigid sheet when the mask is on a wearer's face; at least one strap, wherein the at least one strap ties welded to the first and second pressure-welded portions, respectively; and a nose clip located near the top end, wherein the nose clip is configured to fold the mask over the wearer's nose so that it is in the nose area A tight state is formed above. The mask of claim 1, wherein the nose clip comprises at least one overmolded metal core strip or wire embedded in a plastic strip configured to bridge the nose gap and provide seal strength. The mask of claim 1, wherein the nose clip comprises at least three overmolded metal core strips or wires embedded in a plastic strip that are configured to bridge the nose gap and provide seal strength. The mask of claim 1, wherein the nose clip is a plastic strip with at least three overmolded metal cores embedded therein, and wherein each metal core is in the plastic strip arranged in parallel. The mask as claimed in claim 1, wherein the nose clip has a memory function. The mask of claim 1, wherein at least one of the straps further comprises a soft rubber adjuster to provide a tight fit when the mask is worn on the wearer's face. The mask of claim 1, wherein the first pressure-welded portion and the second pressure-welded portion each include a substantially horizontal welding line and a substantially vertical welding line. The mask according to claim 7, wherein the width W of the horizontal welding line and the substantially vertical welding line is about 1.5-2.5 cm. The mask of claim 1, wherein the at least one strap forms a loop configured to encircle a wearer's head. The mask of claim 1, wherein the at least one strap forms a loop configured to encircle a wearer's ear. The mask of claim 1, wherein the nose clip and the adjuster are combined to form a tight fit on the wearer's face. The mask of claim 1, wherein the at least one layer comprises an outer layer and an inner layer. The mask of claim 12, wherein the at least one layer further comprises at least one intermediate layer disposed between the outer layer and the inner layer. The mask of claim 13, wherein the outer layer, at least one middle layer and a periphery of the inner layer are welded together. The mask of claim 1 , wherein the mask further comprises a horizontal plane without pleats formed between the at least one upper pleat and the at least one lower pleat in the center of the body, which is configured to form an air chamber. The mask of claim 15, wherein the horizontal flat unfolded region straddles a centerline between the bottom of the wearer's nose and the top of the wearer's mouth. The mask of claim 1, wherein when the ends of the first pressure-welded portion and the second pressure-welded portion are tightened through the at least one strap, the mask completely fits the wearer's face. A mask, comprising: an outer layer; one or more middle layers; and an inner layer; wherein each layer comprises a body having a substantially oval shape, which has a top end, a bottom end, a side facing the first end, A side to the second end, and includes at least one upper pleat laterally disposed above a center of the body, and at least one lower pleat laterally disposed below the center of the body, wherein at the center of the body the at least one A horizontal plane without pleats is formed between the upper pleat and the at least one lower pleat, which is configured to form an air chamber; a first pressure-welded portion at the first lateral end and a second pressure welding portion at the lateral second end A pressure welded portion, wherein the welded ends are both rigid and configured to prevent the lateral first end of the mask and the second Two ends are deformed; at least two internal welding points are disposed adjacent to the lateral first end and the lateral second end, respectively, wherein these internal welding points fix each pleat of the mask to the body of the mask, so that A rigid sheet is formed when the mask is on a wearer's face; at least one strap, wherein the at least one strap is welded to the first pressure-welded portion and the second pressure-welded portion, respectively; wherein at least one of the straps includes an adjustment a device for a tight fit when the mask is worn on the wearer's face; and a nose clip located near the top end, wherein the nose clip is configured to bend the mask to fit the wearer's face over the wearer's nose so as to form a seal over the nose area; and wherein the body of the mask is fully abutted when the first and second pressure-welded ends are pulled tight by the at least one strap on the wearer's face; and Wherein the outer layer, the one or more intermediate layers, and a periphery of the inner layer are welded together.

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