TWI708624B - Anti-leak protective face mask - Google Patents

Abstract

An airtight protective mask, comprising: a mask body with at least one outer layer, a middle layer, and an inner layer in sequence; two airtight sheets, which are respectively fixed on both sides of the mask body, each airtight sheet includes a fixed part and a secondary fixed part The extended adhesion part, the fixing part is wrapped on one side of the mask body and fixed on the outer layer and the inner layer, and the adhesion part is arranged in the corresponding inner layer direction; two fixing zones, each fixing zone group Connect the airtight sheet and the mask body, the fixing zone group includes an upper fixing zone and a lower fixing zone, the upper and lower fixing zones are respectively corresponding to the upper and lower ends of the sealing part to be welded to the mask body; and a strap set, including two straps Connect the two sides of the mask body respectively.

Description

Airtight protective mask and its manufacturing method

The invention relates to a mask and its manufacturing method, in particular to an airtight protective mask and its manufacturing method.

In recent years, the rapid development of industry and cities, various factories, coal-fired power plants and a large number of steam and locomotive exhaust emissions have caused serious air pollution, dust and haze (fine suspended particulate PM2.5), pollen, and dust in the environment. , Entering the human body through the respiratory tract can cause various diseases such as allergies, asthma or colds, sneezing, runny nose, etc., causing a decline in human immunity, causing various diseases, and seriously affecting human health. In particular, the WHO (World Health Organization) announced in 2013 that among the top ten causes of death in the world, seven are closely related to air pollution, which has promoted countries around the world to increase haze prevention efforts, and at the same time caused most people to wear various types of masks. The WHO issued a report on October 29, 2018, stating that about 93% of the world, equivalent to 1.8 billion children under the age of 15, are exposed to the poison of air pollution, shocking all walks of life.

In view of the serious health hazards of dust and haze PM2.5, China and Taiwan formulated and announced national standards for haze masks in 2016/2017 in accordance with the US regulations N95 series and European regulations FFP and other dust masks. However, according to the Taiwan standard CNS14774 and 14755 protective mask (N95/FFP) D2 adhesion test method, the adhesion of the mask must reach 100. However, according to the test of 100 people by the Taiwan Labor Research Institute (Labor Safety and Health Institute), it is commercially available The average tightness of the two N95 masks is 13.9 and 21.8, while the average average flat surgical mask is only 3.10, which means that the air leakage rate is 32.3% (that is, the tightness is 67.7%), which means that the bacterial filtration efficiency (BFE) is only 67.7%. Normally, if 99% of medical mask BFE is tested according to the N95 standard, that is, 85L instead of 32L wind speed test, the efficiency of filtering dust and haze (PM2.5) is only about 60%, and the overall protection effect is about 40.6% when the leakage rate is included. Due to the progress of production technology in the past few years, the salt spray filtration efficiency of N95 dust masks can reach more than 99%. However, good masks also need to have the characteristics of good adhesion and low pressure difference, but the pressure difference (respiratory resistance) of the general N95 series masks is quite high, not suitable for long-term wear, especially the three groups cannot be used, such as children and pregnant women. People with weak lung diseases, even if they are severely dusty, need to be worn, but they are not suitable for wearing.

In addition, in recent years, various bacterial viruses and influenza in the living environment continue to invade humans, such as severe acute respiratory syndrome (SARS), avian influenza (H7N9), swine influenza (H1N1), etc., which are all killers of human health, showing that high-quality masks are especially dense. Masks with good fit and low pressure drop are extremely important for the maintenance of human health.

As shown in Figure 23, the Republic of China Patent Publication No. TW201526945A discloses a mask (A3), which includes a mask body (A10) and ear hooks (A12) formed at both ends of the mask body (A10) in the transverse direction. A plurality of creases (A14) are formed, and the plurality of creases (A14) are fixed by a welded part (A22) formed by heat sealing. The welded part (A22) is formed in two horizontal directions of the mask body (A10). The sides are formed straight at equal intervals in the longitudinal direction, and the interval between adjacent welded parts (A22) is 3mm or more. Both ends of the mask body (A10) in the transverse direction are covered by side straps (A30), and the ear hooks (A12) are attached to the side straps (A30). The mask body (A10) is provided with side blocks (A32) covering the gap between the face and the mask body (A10) at both lateral ends of the mask body (A10) abutting the wearer's face. The side block (A32) is formed by sandwiching one end of the side insulating tape (A31) formed into a wide band between the mask body (A10) and the side tape (A30). By making the side of the mask body (A10) tightly adhere to the face, the gap between the mask body (A10) and the face can be suppressed, and the intrusion of fine particles into the mask can be suppressed.

However, in the above-mentioned published patent, the mask side block (A32) is formed by first welding the upper and lower ends of the side insulating tape (A31) with mesh seals (A17, A24) to the upper and lower sides of the mask body (A10). Then, the side tape (A30) covers the side insulation tape (A31) and the mask body (A10) side and welds them to complete. Therefore, the molding steps are many and the manufacturing process is complicated; in addition, the method of covering the side insulating tape (A31) and the mask body (A10) with the side tape (A30) will also cause the waste of mask materials and increase the production cost.

In view of this, one of the objectives of the present invention is to provide an airtight protective mask and its manufacturing method. The airtight sheet is wrapped on one side of the mask body and fixed on the outer layer and the inner layer to form a one-time molding, so the manufacturing process and structure are simple , The production cost is low.

Another object of the present invention is to provide an airtight protective mask and its manufacturing method, which adopts L-shaped upper and lower fixing areas to weld the strap. The feature is that the two ends of the strap can be fused to avoid the strap The whole problem of being welded at the end.

In order to achieve the above object, the present invention provides an airtight protective mask, which includes a mask body with at least an outer layer, a middle layer and an inner layer in sequence; at least two airtight sheets are fixed on both sides of the mask body respectively , Each of the airtight sheets includes a fixing part and a close part extending from the fixing part, the fixing part is wrapped on one side of the mask body and fixed to the outer layer and the inner layer, the The sealing part is arranged corresponding to the direction of the inner layer; there are two sets of fixing zones, each set of fixing zones connects the airtight sheet and the mask body, the set of fixing zones includes an upper fixing zone and a lower fixing zone. The upper and lower fixing areas are respectively corresponding to the upper and lower ends of the sealing part to be welded to the mask body; and a strap set including two straps respectively connected to both sides of the mask body.

Preferably, the airtight sheet has a single-layer or multi-layer structure.

Preferably, the wrinkle section of the mask body is Ω-shaped or zigzag-shaped.

Preferably, the strap set is located on the outer layer or the inner layer and is arranged toward the inner side of the mask body.

Preferably, it further includes an upper airtight sheet fixedly connected to the upper side of the mask body.

Preferably, it further includes a lower airtight sheet, which is fixedly attached to the lower side of the mask body.

Preferably, the mask body is formed with two longitudinal folds.

Preferably, it further includes an exhalation valve installed on the mask body.

Preferably, it further includes an embedded nose pad embedded in the upper part of the mask body.

In order to achieve the above objective, the present invention provides a method for manufacturing an airtight protective mask, which includes the following steps: providing a mask body with an inner layer; providing at least one airtight sheet, covering one side of the mask body to A close part is formed on the surface of the inner layer; and a strap set is provided to weld the mask body and the close part.

In addition, the present invention has the following features and effects:

(1) The periphery of the mask fits the shape of the face. The left and right sides of the mask are closely attached to the bottom and the face, and the contact surface is evenly distributed around the mouth and nose, reducing the generation of gaps, preventing dust and particles from entering through the gaps, greatly improving the tightness of the mask and making it safer and more comfortable to wear.

(2) The upper anti-fog and airtight film is enlarged, and the area is enlarged to effectively block the fog upward and prevent the lens from fogging.

(3) The embedded nose bridge bead structure is close to the nose bridge, effectively preventing dust and particles from penetrating through the gap of the nose bridge.

(4) Soft ear lanyard, comfortable to wear on ears. Wearing for a long time, the ear is not easy to feel pain and discomfort.

(5) The three-dimensional structure of double folds Ω keeps the mask at a certain distance from the lips, and there is no sense of blocking when breathing. It maintains a comfortable mouth and nose space and reduces the feeling of stuffiness and discomfort.

(6) Special diamond three-dimensional shape, comfortable to wear, beautiful and generous. When wearing it, it does not stick to the nose and mouth, so that breathing is smooth, speaking naturally, not sticking to lip marks, and maintaining a perfect face.

(7) Use medical grade filter material, mask body 0.1μm submicron particle filtration efficiency (Particulate Filtration Efficiency, PFE) ≧ 99%, bacterial filtration efficiency (Bacterial Filtration Efficiency, BFE) ≧ 99%, in line with general medical grade and surgical mask standards .

(8) The filtration efficiency of the airtight sheet can reach more than 95%, effectively blocking more than 95% of particles smaller than 0.1μm in the air. It can also be applied to N95 anti-haze masks. In addition, depending on the filter material of the mask, the airtight sheet can be matched with the N95/N99/N100 series of American dust masks, the EU FFP1/FFP2/FFP3 series or other standards of the same level.

(9) It can effectively prevent the inhalation of pollen, high-density dust, sand and haze pollution and other harmful substances, effectively resist PM 2.5, and isolate 99% of germs and airborne particles. It is suitable for colds, sneezing, flu, pollen and other countermeasures, and is the first choice for haze weather!

The detailed description and technical content of the present invention are described as follows in conjunction with the drawings. However, the drawings are only provided for reference and description, and are not intended to limit the present invention.

Please refer to Figures 1 to 4, an airtight protective mask provided by the present invention includes a mask body (10), at least two airtight sheets (20), two fixing zones (30), and a strap set ( 40), as follows:

The mask body (10) is formed with a plurality of horizontal folds (16), and at least one outer layer (11), a middle layer (13) and an inner layer (15) are sequentially arranged inside the mask body (10). The outer layer (11) can be a water-repellent layer such as a non-woven fabric with water-repellent function to prevent the penetration of water and liquid. The middle layer (13) can be a filter layer such as an electrostatic high-density melt-blown non-woven fabric to block dust, haze, viruses and bacteria. The inner layer (15) can be a hydrophilic layer such as a hydrophilic superfine composite fiber non-woven fabric, which is soft and comfortable, and can effectively absorb moisture. The wrinkle (16) section of the mask body (10) is Ω-shaped (as shown in Fig. 4 is a cross-sectional view along B-B in Fig. 2), and the three-dimensional structure of double wrinkles Ω can keep the mask at a certain distance from the lips. There is no sense of blockage when breathing, and a comfortable nose and mouth space is maintained to reduce the feeling of stuffiness and discomfort.

At least two airtight sheets (20) are respectively fixed on both sides of the mask body (10). Each airtight sheet (20) includes a fixing part (21) and a sealing part (21) extending from the fixing part (21). 23) (Figure 3 is a cross-sectional view taken along the line A-A of Figure 2), the fixing part (21) is wrapped on one side of the mask body (10) and fixed on the outer layer (11) and the inner layer (15), dense The joint (23) is arranged corresponding to the direction of the inner layer (15). The airtight sheet (20) is a separable or composite nonwoven fabric with a two-layer structure, composed of two layers of spunbond and meltblown nonwovens (Spunbond + Meltblown Nonwovens, SM), which is a composite of spunbond and meltblown product. In order to filter out dust, particles and dirty air entering from both sides of the mask.

Two fixing zone groups (30), each fixing zone group (30) connects the airtight sheet (20) and the mask body (10), the fixing zone group (30) includes an upper fixing zone (31) and a lower fixing Area (33), upper and lower fixing areas (31, 33) are respectively corresponding to the upper and lower ends of the close part (23) and are welded to the mask body (10).

The strap set (40) includes two straps (41), which can be, for example, ear straps respectively fixed on the left and right sides of the mask body (10), wherein the straps (41) are fixed to the mask body (10) at one end The upper end and the other end are fixed to the lower end. The strap (41) can be ear straps, straps or head straps, but is not limited to this.

When the user wears the present invention, as shown in FIG. 5. Please hold the mask first, and unfold the fold into a solid space. The nose bridge piece (19) is outward, and an ear strap (41) is worn to make the mask completely cover the mouth, nose and chin. Press the nose piece (19) with two fingers to make the mask fit the nose and cheeks closely. Among them, the sealing part (23) of the airtight sheet (20) can be opened and closely attached to the face to reduce the generation of gaps, prevent dust and particles from penetrating through the gaps, greatly improve the tightness of the mask, and make wearing more safe and comfort.

Moreover, the airtight sheet (20) is wrapped on one side of the mask body (10) and fixed on the outer layer (11) and the inner layer (15) to form one-time molding, so the manufacturing process and structure are simple, and the production cost is low.

Please refer to FIG. 6, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiments is that it may further include an upper airtight sheet (50) or an anti-fog airtight patch, which is fixed to The upper side of the mask body (10). In this way, the area is enlarged to effectively block the mist upward, prevent the lens from fogging, and achieve the same functions and effects as the above.

Please refer to FIG. 7, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiments is that it can further include a lower airtight sheet (60) fixedly attached to the lower side of the mask body (10). In this way, the gap between the chin and the mask can be effectively filled, and the mask can more completely fit the shape of the face.

Please refer to FIG. 8, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that it can further include an upper airtight sheet (50) and a lower airtight sheet (60), which are respectively fixedly connected On the upper and lower sides of the mask body (10). In this way, the functions and effects of FIGS. 6 and 7 of the aforementioned embodiment are achieved.

Please refer to Figures 9 to 11, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the mask body (10) is formed with two longitudinal folds (17) (as shown in Figure 11) Take the C-C sectional view of Figure 10). Thereby, when the mask body (10) is unfolded, a special diamond three-dimensional shape can be formed, which makes wearing comfortable and beautiful, and does not stick to the mouth and nose when wearing, breathes smoothly, speaks naturally, does not stick to lip marks, and can maintain a perfect face.

Please refer to FIG. 12, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that it further includes an exhalation valve (70) installed on the mask body (10). In this way, there is no sense of blockage when breathing, a comfortable mouth and nose space can be maintained, and the feeling of stuffiness and discomfort can be reduced.

Please refer to Figures 13 to 14, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiments is that it further includes an implantable nose pad (80) or a nose bridge bead structure, which is embedded in the mask The upper part of the body (10) (as shown in Fig. 14 is a cross-sectional view along D-D of Fig. 13), the implantable nose pad (80) includes a nose bridge strip (81) and an elastic body (83), and the nose bridge strip (81) is made of a plastic part ( 812) and its coated iron wire (811), the elastomer (83) can be, for example, foam. Thereby, the embedded nose pad (80) or the nose bridge pressing strip structure can be close to the nose bridge, effectively preventing dust and particles from penetrating through the gap of the nose bridge.

Please refer to FIG. 15, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiments is that the airtight sheet (20) is a separable or composite non-woven fabric with a three-layer or four-layer structure , Consists of three layers of spunbond and meltblown and spunbond nonwovens (Spunbond + Meltblown + Spunbond Nonwovens, SMS) or four layers of sheets (Spunbond + Meltblown + Meltblown + Spunbond Nonwovens, SMMS), which are spunbond and meltblown Composite products. In order to filter out dust, particles and dirty air entering from both sides of the mask. In addition, the airtight sheet (20) can also adopt a five-layer structure, that is, a combination of SMMS and an antibacterial layer.

Please refer to Figure 16, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the strap set (40) is located on the outer layer (11) and faces the inner side of the mask body (10). Configuration (forming inner ear hook), thereby increasing the convenience of mask packaging. Among them, L-shaped upper and lower fixing areas (31, 33) are used to weld the strap (41). Its characteristic is that when the ends of the strap (41) are welded, the end of the strap (41) can be avoided. The problem of the entire segment being welded.

Please refer to Figure 17, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the strap set (40) is located on the inner layer (15) and faces the mask body (10). Directional configuration (forming inner ear hook), thereby increasing the convenience of mask packaging.

Please refer to Figures 18 to 19, which are a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the horizontal fold (16) section of the mask body (10) is in a zigzag shape ( Figure 19 is a cross-sectional view taken along the E-E of Figure 18). It can be applied to masks with traditional folds.

Please refer to Figure 20, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the airtight sheet (20) is a non-woven fabric with a single-layer structure, which can be spunbonded non-woven fabric. Spunbond Nonwovens or Meltblown Nonwovens. In order to filter out dust, particles and dirty air entering from both sides of the mask.

Please refer to FIG. 21, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the strap set (40) includes at least two straps (43), and each strap (43) ) Are respectively fixed along the left side and the right side of the mask body (10), and both ends of the mask body (10) extend outside the outlet mask body (10). The length of the strap (43) can preferably be between 40 and 95 cm. When in use, the strap (43) can be tied to the head for fixation.

Please refer to FIG. 22, which is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiments is that the strap set (40) includes at least two straps (43), and each strap (43) ) Are respectively fixed along the upper and lower sides of the mask body (10), and both ends of the mask body (10) extend outside the outlet mask body (10). The length of the strap (43) can preferably be between 40 and 95 cm. When in use, the strap (43) can be tied to the head for fixation.

It is worth noting that the airtight sheet (20) can also be provided with an activated carbon layer, which can absorb ozone and organic odors. Or, air-tight materials or film can be used to block dust, particles, and dirty air entering from both sides of the mask. The mask of the present invention can be general medical masks, surgical masks, dust masks, activated carbon masks, American standard N95/N99/N100 series masks or European standard FFP1/FFP2/FFP3 series masks, or even anti-haze masks A, B, C, D and other masks.

Please refer to FIG. 24. The method for manufacturing an airtight protective mask provided by the present invention includes the following steps S101 to S105:

Step S101: provide a mask body (10) with an inner layer (15);

Step S103: provide an airtight sheet (20), which is wrapped on one side of the mask body (10) to form a tight part (23) on the inner layer (15); and

Step S105: Provide a strap set (40), which is welded to the mask body (10) and the close part (23).

In this way, it is formed by covering and welding. Therefore, the present invention has the effects of simple manufacturing process and structure, and low production cost.

The invention can effectively prevent the inhalation of harmful substances such as pollen, high-density dust, sand and haze pollution, effectively resist PM 2.5, and is the indispensable first choice for haze weather. It is also suitable for countermeasures against colds, sneezing, flu, pollen, etc., as well as prevention of infections when taking the MRT, bus or going to the hospital.

In summary, compared with the prior art, the present invention has the following effects: the airtight sheet (20) is wrapped on one side of the mask body (10) and fixed on the outer layer (11) and the inner layer (15). Forming, so the manufacturing process and structure are simple, and the production cost is low.

In addition, the present invention also has other effects: the left and right sides of the mask, the bottom side and the top side, and the face are closely attached, which greatly improves the tightness of the mask. The three-dimensional structure of double folds Ω keeps the mask at a certain distance from the lips, and there is no sense of blockage when breathing. It can maintain a comfortable mouth and nose space and reduce the feeling of stuffiness and discomfort. The soft ear lanyard makes the ears comfortable to wear, and it is not easy to feel pain and discomfort when worn for a long time.

The above are only the preferred and feasible embodiments of the present invention, and are not limited to the scope of the present invention. Any equivalent structural changes made by using the description and drawings of the present invention are all included in the present invention. Within the scope of the rights, he shall be Chen Ming.

this invention (10): Mask body (11): Outer layer (13): Middle (15): inner layer (16): Horizontal folds (17): Longitudinal folds (19): Nose bridge (20): Airtight sheet (21): Fixed part (23): Sealing part (30): Fixed connection zone group (31): Upper fixed area (33): Lower fixed area (40): Lanyard set (41): Lanyard (43): Strap (50): Upper airtight sheet (60): Lower airtight sheet (70): Exhalation valve (80): Inserted nose pad (81): Nose Bridge (811): Wire (812): Plastic parts (83): Elastomer S101～S105: steps

Known technology (A3): Mask (A10): The mask body (A12): Earhook (A14): Crease (A22): Welding part (A30): Side strap (A32): Side block (A31): Side insulation tape (A17, A24): grid sealing

Figure 1 is a schematic front view of the airtight protective mask of the present invention. Figure 2 is a schematic back view of Figure 1. Figure 3 is a sectional view taken along the line A-A in Figure 2. Figure 4 is a cross-sectional view taken along the line B-B in Figure 2. Figure 5 is a schematic diagram of a user wearing the present invention. Figure 6 is a diagram of a preferred embodiment of the present invention (with an upper airtight sheet). Figure 7 is a diagram of a preferred embodiment of the present invention (with a lower airtight sheet). Figure 8 is a diagram of a preferred embodiment of the present invention (with upper and lower airtight sheets). Figure 9 is a diagram of a preferred embodiment of the present invention (with longitudinal folds). Fig. 10 is a schematic diagram of the back of Fig. 9. Figure 11 is a cross-sectional view taken along line C-C in Figure 10. Figure 12 is a diagram of a preferred embodiment of the present invention (with an exhalation valve). Figure 13 is a diagram of a preferred embodiment of the present invention (with an embedded nose pad). Figure 14 is a cross-sectional view taken along D-D of Figure 13. Figure 15 is a diagram of a preferred embodiment of the present invention (multilayer structure of airtight sheet). Figure 16 is a diagram of a preferred embodiment of the present invention (inner ear hook is formed). Figure 17 is a diagram of a preferred embodiment of the present invention (inner ear hook is formed). Figure 18 is a diagram of a preferred embodiment of the present invention (traditional folding method). Figure 19 is a cross-sectional view taken along E-E of Figure 18. Figure 20 is a diagram of a preferred embodiment of the present invention (single layer structure of the airtight sheet). Figure 21 is a diagram of a preferred embodiment of the present invention (the strap is left and right side straps). Figure 22 is a diagram of a preferred embodiment of the present invention (the strap is upper and lower straps). Figure 23 is a three-dimensional view of a conventional mask. Figure 24 is a flow chart of the method for manufacturing an airtight protective mask of the present invention.

(10): Mask body

(15): inner layer

(16): Horizontal folds

(19): Nose bridge

(20): Airtight sheet

(23): Sealing part

(30): Fixed connection zone group

(31): Upper fixed area

(33): Lower fixed area

(40): Lanyard set

(41): Lanyard

Claims (7)

An airtight protective mask includes: a mask body with at least an outer layer, a middle layer and an inner layer in sequence; at least two airtight sheets, respectively fixed on both sides of the mask body, each airtight sheet includes There is a fixed part and a close part extending from the fixed part, the fixed part is wrapped on one side of the mask body and fixed to the outer layer and the inner layer, and the close part corresponds to the inner layer Directional configuration; two fixed area groups, each of the fixed area groups connects the airtight sheet and the mask body, the fixed area group includes an upper fixed area and a lower fixed area, the upper and lower fixed areas correspond to The upper and lower ends of the sealing part are welded to the mask body; and a strap set, including two straps connected to the two sides of the mask body respectively; further including an upper airtight sheet, fixed to the upper side of the mask body; There is a lower airtight sheet, which is fixed on the lower side of the mask body; the upper airtight sheet and the lower airtight sheet are located between the mask body and the airtight sheet; each upper fixing area is L-shaped, and the upper side is more welded The side of the airtight sheet is welded to the strap and the upper airtight sheet; the lower fixing areas are L-shaped, the lower side is welded to the lower airtight sheet, and the side edge is welded to the strap and the lower airtight sheet. The airtight protective mask according to claim 1, wherein the airtight sheet has a single-layer or multi-layer structure. The airtight protective mask according to claim 2, wherein the wrinkled section of the mask body is Ω-shaped or zigzag-shaped. The airtight protective mask according to claim 3, wherein the strap set is located on the outer layer or the inner layer and is arranged toward the inner side of the mask body. The airtight protective mask according to claim 1, 2, 3 or 4, wherein the mask body is formed with two longitudinal folds. The airtight protective mask as described in claim 5 further includes an exhalation valve installed in the body of the mask. The air-tight protective mask as described in claim 1, 2, 3 or 4, which also includes an implantable nose The pad is arranged between the inner layer and the outer layer on the upper part of the mask body.

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