WO2020103656A1

WO2020103656A1 - Novel airtight protective mask

Info

Publication number: WO2020103656A1
Application number: PCT/CN2019/114279
Authority: WO
Inventors: 郑永柱; 郑乾锋; 郑羽良
Original assignee: 华新医材股份有限公司
Priority date: 2018-11-20
Filing date: 2019-10-30
Publication date: 2020-05-28
Also published as: CN209202201U; US20210401079A1

Abstract

A novel airtight protective mask, comprising: a mask body (10) sequentially provided with at least one outer layer (11), one middle layer (13), and one inner layer (15); at least two airtight sheets (20) respectively fixed at two sides of the mask body (10), each airtight sheet (20) comprising a fixing portion (21) and a tight fit portion (23) extending out from the fixing portion (21), the fixing portion (21) covering one side of the mask body (10) and being fixedly connected to the outer layer (11) and the inner layer (15) and the inner layer (15), and the tight fit portion (23) being arranged in the direction of the corresponding inner layer (15); two fixing blocks (30), each fixing block (30) being connected to the airtight sheet (20) and the mask body (10), and the fixing block (30) comprising an upper fixing region (31) and a lower fixing region (32), the upper and lower fixing regions (31, 32) being welded to the mask body (10) respectively corresponding to the upper and lower ends of the tight fit portion (23); and a lanyard group (40), comprising two lanyards (41), the two lanyards (41) being connected to the two sides of the mask body (10), respectively. The airtight sheet (20) covers one side of the mask body (10) and is fixedly connected to the outer layer (11) and the inner layer (15), so that the protective mask can be formed in one step, and thus, the manufacturing and structure are simple, and production costs are low.

Description

A new airtight protective mask

Technical field

The present invention relates to a mask, in particular to a new airtight protective mask.

Background technique

In recent years, the rapid development of industry and cities, various types of factories, coal-fired power plants, and large amounts of exhaust gas from automobiles and locomotives have caused serious air pollution, dust and haze in the environment (fine suspended particles PM2.5), pollen, dust Entering the human body through the respiratory tract can cause various diseases such as allergies, asthma or colds, sneezing, runny nose, etc., causing the decline of human immunity, causing various diseases and seriously affecting human health. In particular, the World Health Organization (WHO) announced in 2013 that seven of the world ’s top ten causes of death are closely related to air pollution, which has caused countries around the world to step up their efforts to prevent haze. At the same time, it has caused most people to wear various masks. The WHO issued a report on October 29, 2018, pointing out that about 93% of the world ’s population, equivalent to 1.8 billion children under the age of 15, were exposed to air pollution and shocked people from all walks of life.

[Corrected in accordance with Rule 26 19.11.2019]
In view of the serious health hazards of dust and haze PM2.5, China formulated and announced national standards for haze-proof masks in 2016/2017 according to the dust masks of the US-compliant N95 series and European-standard FFP. However, according to the test method of D2 adhesion of China National Standards CNS14774 and 14755 protective masks (N95 / FFP), the mask adhesion must be able to reach 100, but according to the test of 100 people from the Taiwan Labor Research Institute (Labor Safety and Health Research Institute), the city The average tightness of the two N95 masks sold is 13.9 and 21.8, while the average of general planar surgical masks is only 3.10, which is the air leakage rate of 32.3% (that is, the tightness is 67.7%), which is the bacterial filtration efficiency (BFE) Only 67.7%. Generally, 99% of BFE medical masks are tested according to the standard of N95, 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 taking into account the air leakage rate. Due to the progress of production technology in recent years, the salt mist filtration efficiency of N95 dust masks can reach more than 99%. But good masks need to have the characteristics of good adhesion and low pressure difference, but the pressure difference (respiration resistance) of N95 series masks is quite high, which is not suitable for long-term wear, especially the three groups cannot be used, such as children , Pregnant women and people with weak lungs, even if the dust is very serious, they are not suitable for wearing.

In addition, in recent years, various bacterial viruses and influenza have continuously invaded humans in the living environment, such as severe acute respiratory syndrome (SARS), avian influenza (H7N9), swine influenza (H1N1), etc., are killers of human health, showing that high-quality masks are especially Masks with good adhesion and low pressure difference are extremely important for the maintenance of human health.

As shown in FIG. 23, the patent document with the patent publication number TW201526945A discloses a mask A3 including a mask body A10, and ear hook portions A12 formed at both ends of the mask body A10 in the lateral direction, and formed A plurality of strip-shaped creases A14, a plurality of strip-shaped creases A14 are fixed by a welded portion A22 formed by heat sealing, the welded portions A22 are on both sides in the lateral direction of the mask body A10 and equally spaced in the longitudinal direction of the mask body A10 A linear shape is formed, and the distance between adjacent welding portions A22 is 3 mm (millimeter) or more. The lateral ends of the mask body A10 are covered with side straps A30, and the ear hooks A12 are attached to the aforementioned side straps A30. A side block A32 covering the gap between the face and the mask body A10 is provided at both ends in the lateral direction of the mask body A10 in contact with the side of the wearer's face. The side block A32 is formed by sandwiching one end of the wide-band side insulating tape A31 between the mask body A10 and the side band A30 so that the side of the mask body A10 closely adheres to the face, which can suppress the mask body A10 There is a gap between the face and the micro-particles to prevent intrusion into the mask.

In the above-mentioned published patent, the mask side block A32 is formed by welding the upper and lower ends of the side insulating tape 31 to the first mesh seal A17 and the second mesh seal A24, respectively, and fixing the upper and lower sides of the mask body A10. Then, the side tape A30 covers the side insulating tape A31 and the mask body A10 and is welded. Therefore, its molding steps are many and the manufacturing process is complicated. In addition, the side tape A30 covering the side insulating tape A31 and the mask body A10 side will also cause the waste of the mask raw materials and increase the production cost.

Summary of the invention

In view of the above problems, the object of the present invention is to provide a new air-tight protective mask, which is formed by covering the side of the mask body with the air-tight sheet and fixed on the outer layer and the inner layer at a time, so the manufacturing, the structure is simple, and the production cost low.

Another object of the present invention is to provide a new airtight protective mask, which uses L-shaped upper and lower fixing areas to weld the lanyard. The problem of living.

In order to achieve the above object, the present invention adopts the following technical solutions: a new gas-tight protective mask, characterized in that it includes: a mask body, which is provided with at least one outer layer, a middle layer and an inner layer in sequence; The dense pieces are respectively fixed on both sides of the mask body, and each of the airtight pieces includes a fixing portion and a sealing portion extending from the fixing portion, the fixing portion is wrapped around the mask body One side is fixedly connected to the outer layer and the inner layer, and the adhesion part is arranged in a direction corresponding to the inner layer; two fixing area groups, each of the fixing area groups are connected to the For the airtight sheet and the mask body, the fixing area group includes an upper fixing area and a lower fixing area, and the upper and lower fixing areas respectively correspond to the upper and lower ends of the sealing portion and are welded to the mask body ; And a lanyard set, including two lanyards, the two lanyards are respectively connected to both sides of the mask body.

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

Further, the wrinkle cross-section of the mask body is omega or zigzag.

Further, the lanyard set is located on the outer layer or the inner layer, and is arranged toward the inside of the mask body.

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

Further, the airtight protective mask further includes a lower airtight sheet fixedly attached to the lower side of the mask body.

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

Further, the airtight protective mask further includes an exhalation valve, which is installed on the mask body.

Further, the airtight protective mask further includes an embedded nose pad, which is disposed between the inner layer and the outer layer on the upper part of the mask body.

Since the present invention adopts the above technical solutions, it has the following advantages: 1. The face of the mask fits the shape of the face. The left and right sides of the mask are closely attached to the bottom and face, and the contact surface is evenly distributed around the mouth and nose, reducing the generation of gaps, preventing dust and particles from drilling through the gap, greatly improving the tightness of the mask, and wearing it more safely and comfortably. 2. The upper anti-fog and air-tight film is pasted, and the area is increased to effectively block the upward fog and prevent the lens from fogging. 3. The built-in nose bridge bead structure is close to the nose bridge to effectively prevent dust and particles from drilling through the gap of the nose bridge. 4. Soft ear lanyard, comfortable wearing on ears. Wear it for a long time, the ear is not easy to feel pain and discomfort. 5. The double-folded Ω three-dimensional structure keeps the mask and the lips at a certain distance. There is no obstruction when breathing, maintain a comfortable mouth and nose space, and reduce the feeling of stuffiness and discomfort. 6. Special diamond three-dimensional structure, comfortable and beautiful to wear. Don't stick to your nose and mouth when wearing, so that you can breathe smoothly, speak naturally, without sticking your lips, and maintain a perfect face. 7. The use of medical grade filter materials, the mask body 0.1μm submicron particle filtration efficiency (Particulate Filtration Efficiency, PFE) ≧ 99.9%, bacterial filtration efficiency (Bacterial Filtration Efficiency, BFE) ≧ 99.9%, in line with medical grade mask standards. 8. The filtering efficiency of the airtight sheet can reach more than 95%, effectively blocking more than 95% of the particles in the air less than 0.1μm (ie unit: micrometer). It can also be applied to N95 grade anti-haze masks. In addition, depending on the filter material of the mask, the airtight film can be matched with the N95 / N99 / N100 series of American dust masks, the EU FFP1 / FFP2 / FFP3 series or other specifications of the same level. 9. It can effectively prevent pollen, high-density dust, sand and smog pollution and other harmful substances from inhaling, effectively resist PM 2.5, and isolate 99.9% of germs and air particles. It is suitable for countermeasures such as cold, sneezing, flu, pollen, etc. It is the first choice for fog and haze.

BRIEF DESCRIPTION

FIG. 1 is a front view of a new airtight protective mask in Embodiment 1. FIG.

2 is a rear view of a new airtight protective mask in Embodiment 1. FIG.

Fig. 3 is a cross-sectional view taken along A-A in Fig. 2.

4 is a cross-sectional view along B-B in FIG. 2.

5 is a schematic diagram of a user wearing a new airtight protective mask in Embodiment 1. FIG.

6 is a schematic structural diagram of a new airtight protective mask in Embodiment 2. FIG.

7 is a schematic structural view of a new airtight protective mask in Embodiment 3. FIG.

8 is a schematic structural diagram of a new airtight protective mask in Example 4. FIG.

9 is a front view of a new airtight protective mask in Embodiment 5. FIG.

10 is a rear view of a new airtight protective mask in Example 5. FIG.

Fig. 11 is a cross-sectional view taken along C-C in Fig. 10.

12 is a schematic structural view of a new airtight protective mask in Example 6. FIG.

13 is a schematic structural view of a new airtight protective mask in Example 7. FIG.

14 is a cross-sectional view along D-D in FIG. 13.

15 is a schematic structural view of a new airtight protective mask in Example 8. FIG.

16 is a schematic structural view of a new airtight protective mask in Example 9. FIG.

17 is a schematic structural view of a new airtight protective mask in Example 10.

18 is a schematic structural view of a new airtight protective mask in Example 11.

Fig. 19 is a cross-sectional view taken along E-E in Fig. 18.

20 is a schematic structural view of a new airtight protective mask in Example 12.

21 is a schematic structural view of a new airtight protective mask in Embodiment 13.

22 is a schematic structural view of a new airtight protective mask in Example 14. FIG.

Fig. 23 is a perspective view of a mask in the prior art.

In the picture: 10-mask body; 11-outer layer; 13-middle layer; 15-inner layer; 16-horizontal wrinkle; 17-longitudinal wrinkle; 19-nose bridge piece; 20-airtight piece; 21-fixing part; 23-adhesive part; 30-fixed area 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-expiratory valve; 80-inserted nose pad; 81-nose bridge; 811-iron wire; 812-plastic part; 83-elastomer.

Figure 23: A3-mask in the prior art; A10-mask body; A12-ear hanging part; A14-crease; A22-welding part; A30-side band; A32-side block; A31-side insulating tape ; A17-first grid seal, A24-second grid seal.

detailed description

The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the disclosure of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

As shown in FIGS. 1-4, in Embodiment 1, the present invention provides a new airtight protective mask, including a mask body 10, an airtight sheet 20, a fixed area group 30, and a lanyard group 40; the description is as follows:

The mask body 10 is formed with a plurality of horizontal pleats 16, and at least one outer layer 11, a middle layer 13 and an inner layer 15 are provided in this order. The outer layer 11 may be a water-repellent layer, such as a water-repellent non-woven fabric (or a non-woven fabric with water-repellent function), to prevent the penetration of moisture and liquid. The middle layer 13 may be a filter layer, such as an electrostatic high-density melt-blown non-woven fabric (or an electrostatic high-density melt-blown non-woven fabric) to block dust and viruses. The inner layer 15 may be a hydrophilic layer such as a hydrophilic ultra-fine composite fiber non-woven fabric (or a hydrophilic ultra-fine composite fiber non-woven fabric), which is soft and comfortable, and effectively absorbs moisture. The horizontal wrinkle 16 of the mask body 10 has an Ω-shaped cross-section (as shown in FIG. 4), and the double-wrinkle Ω three-dimensional structure can keep the mask and the lips at a certain distance, without any obstruction when breathing, and maintain a comfortable mouth and nose space To reduce feeling of boredom and discomfort.

At least two airtight sheets 20 are respectively fixed on both sides of the mask body 10, and each airtight sheet 20 includes a fixing portion 21 and a sealing portion 23 extending from the fixing portion 21 (as shown in FIG. 3), The fixing portion 21 is coated on the side of the mask body 10 and fixed to the outer layer 11 and the inner layer 15, and the adhesion portion 23 is arranged corresponding to the direction of the inner layer 15. Among them, the airtight sheet 20 is a separable or composite nonwoven fabric with a two-layer structure, which is composed of two layers of spunbond and meltblown nonwoven fabric (or nonwoven fabric) (Spunbond + Meltblown Nonwovens, SM), which is spunbonded Composite products with meltblown. This will filter out dust, particles, and dirty air from both sides of the mask.

Two fixed area groups 30, each fixed area group 30 connects the airtight sheet 20 and the mask body 10, the fixed area group 30 includes an upper fixed area 31 and a lower fixed area 33, an upper fixed area 31, a lower fixed area 33 respectively welded to the mask body 10 corresponding to the upper and lower ends of the adhesion part 23.

The hanging strap set 40 includes two hanging straps 41 (such as ear straps), which can be fixed on the left and right sides of the mask body 10 in an ear-hanging type, wherein one end of the strap 41 is fixed to the upper end of the mask body 10, and the other One end is fixed to the lower end. The strap 41 can be an ear strap, a strap or a head strap, but it is not limited thereto.

When the user wears the present invention, as shown in FIG. 5. Please hold the mask first and unfold the fold to form a body space. The nose piece 19 is outward, and the ear strap is put on so that the mask completely covers the nose, nose and chin. Use two fingers to press the nose piece 19 to make the mask fit snugly to the nose and cheeks. Among them, the sealing portion 23 of the airtight sheet 20 can be opened and closely adhered to the face, so as to reduce the generation of gaps, prevent dust and particles from drilling through the gaps, greatly improve the mask tightness, and make wearing more safe and comfortable.

Furthermore, since the airtight sheet 20 is wrapped on the side of the mask body 10 and fixed on the outer layer 11 and the inner layer 15 to be formed at a time, the manufacturing process and structure are simple and the production cost is low.

As shown in FIG. 6, Embodiment 2 is a preferred embodiment of the present invention. The difference between this Embodiment 2 and the previous embodiments is that the airtight protective mask may further include an upper airtight sheet 50 or anti-fog gas. The adhesive patch is fixed on the upper side of the mask body 10. Therefore, increasing the area effectively blocks the mist upwards and prevents the lens from fogging, and can also achieve the same functions and effects as the above.

As shown in FIG. 7, Embodiment 3 is a preferred embodiment of the present invention. The difference between this Embodiment 3 and the previous embodiments is that the air-tight protective mask may further include a lower air-tight sheet 60, which is fixed to The lower side of the mask body 10. Therefore, it can effectively fill the gap between the chin and the mask, making the mask more completely close to the face shape.

As shown in FIG. 8, Embodiment 4 is a preferred embodiment of the present invention. This Embodiment 4 differs from the foregoing embodiments in that the airtight protective mask may further include an upper airtight sheet 50 and a lower airtight The sheet 60 is fixed to the upper and lower sides of the mask body 10 respectively. Thus, the functions and effects of FIG. 6 and FIG. 7 in the foregoing embodiment are achieved.

As shown in FIGS. 9 to 11, Embodiment 5 is a preferred embodiment of the present invention. This embodiment 5 differs from the foregoing embodiments in that the mask body 10 is formed with two longitudinal folds 17 ( (As shown in Figure 11). Therefore, when the mask body 10 is unfolded, a special diamond three-dimensional structure can be formed, which makes the wearing comfortable and beautiful, and does not stick to the mouth and nose when wearing, smooth breathing, natural speaking, and no lip print, can maintain a perfect face.

As shown in FIG. 12, Embodiment 6 is a preferred embodiment of the present invention. This Embodiment 6 differs from the foregoing embodiments in that the gas-tight protective mask further includes an exhalation valve 70, which is installed in the mask body 10 on. Therefore, there is no feeling of blockage when breathing, which can maintain a comfortable mouth and nose space and reduce breathlessness and discomfort.

As shown in FIGS. 13 to 14, Embodiment 7 is a preferred embodiment of the present invention. The difference between this embodiment 7 and the previous embodiment is that the airtight protective mask further includes an embedded nose pad 80 or Nose bridge bead structure, embedded in the upper part of the mask body 10 (as shown in FIG. 14), the embedded nose pad 80 includes a nose bridge 81 and an elastic body 83, the nose bridge 81 is composed of a plastic part 812 and its coated iron wire 811, elastic The body 83 may be, for example, foam. Therefore, the built-in nose pad 80 or nose bridge bead structure can closely adhere to the nose bridge, effectively preventing dust and particles from drilling into the gap of the nose bridge.

As shown in FIG. 15, Embodiment 8 is a preferred embodiment of the present invention. This Embodiment 8 is different from the foregoing embodiments in that the airtight sheet 20 is separable using a three-layer or four-layer structure. Or composite non-woven fabric, consisting of spunbond and melt-blown and spunbond non-woven fabric (or non-woven fabric) a total of three layers (Spunbond + Meltblown + Spunbond Nonwovens, SMS) or four layers (Spunbond + Meltblown + Meltblown + Spunbond Nonwovens, SMMS) is a composite product of spunbond and meltblown. This will filter out dust, particles, and dirty air from both sides of the mask. In addition, the airtight sheet 20 may also adopt a five-layer structure, that is, SMMS plus an antibacterial layer.

As shown in FIG. 16, Embodiment 9 is a preferred embodiment of the present invention. This Embodiment 9 differs from the foregoing embodiments in that the strap set 40 is located on the outer layer 11 and faces the inside of the mask body 10 Orientation (form the inner ear hook), thus increasing the convenience on the mask packaging. Among them, the upper and

lower fixing regions

31 and 33 respectively having an L shape are used to weld the hanging strap 41, which is characterized in that when the two ends of the hanging strap 41 are welded, the problem that the entire end of the hanging strap 41 is welded can be avoided.

As shown in FIG. 17, Embodiment 10 is a preferred embodiment of the present invention. The difference between this embodiment 10 and the previous embodiments is that the strap set 40 is located on the inner layer 15 and faces the inside of the mask body 10 Orientation (form the inner ear hook), thus increasing the convenience on the mask packaging.

As shown in FIGS. 18 and 19, embodiment 11 is a preferred embodiment of the present invention. This embodiment 11 differs from the foregoing embodiments in that the horizontal fold 16 of the mask body 10 has a zigzag cross section ( (As shown in Figure 19). It can be applied to the masks of the traditional traditional pleating method.

As shown in FIG. 20, Embodiment 12 is a preferred embodiment of the present invention. The difference between this embodiment 12 and the previous embodiments is that the airtight sheet 20 is a non-woven fabric with a single-layer structure, which can be Spunbond Nonwovens (Spunbond Nonwovens), or Meltblown Nonwovens (Meltblown Nonwovens). This will filter out dust, particles, and dirty air from both sides of the mask.

As shown in FIG. 21, Embodiment 13 is a preferred embodiment of the present invention. This Embodiment 13 is different from the foregoing embodiments in that the strap set 40 includes at least two straps 43, 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 may preferably be between 40 and 95 cm. When in use, the strap 43 can be tied to the head for fixing.

As shown in FIG. 22, Embodiment 14 is a preferred embodiment of the present invention. The difference between this Embodiment 14 and the previous embodiments is that the strap set 40 includes at least two straps 43, each strap 43 are respectively fixed along the upper side and the lower side of the mask body 10, and both ends of the mask body 10 extend beyond the outlet mask body 10. The length of the strap 43 may preferably be between 40 and 95 cm. When in use, the strap 43 can be tied to the head for fixing.

It is worth noting that the airtight sheet 20 may also be provided with an activated carbon layer, which can absorb ozone and organic odors. Or use airtight materials or adhesive films to block dust, particles and dirty air from the sides of the mask.

The invention can effectively prevent pollen, high-density dust, sand dust and smog pollution and other harmful substances from inhaling, and effectively resists PM 2.5, which is an essential first choice for smog weather. It is also suitable for countermeasures such as cold, sneezing, flu, pollen, etc., and for preventing infections in offices, on MRT, buses, or in hospitals.

In summary, compared with the prior art, the present invention has the following characteristics: the airtight sheet 20 is wrapped on the side of the mask body 10 and fixed on the outer layer 11 and the inner layer 15 for one-time molding, so the production, the structure is simple, and the production low cost.

In addition, the present invention has other characteristics: the left and right sides of the mask, the bottom edge and the upper side and the face are closely attached, and the tightness of the mask is greatly improved. The double-wrinkle Ω three-dimensional structure keeps the mask and lips at a certain distance. There is no obstruction during breathing, which can maintain a comfortable mouth and nose space and reduce breathlessness and discomfort. The soft ear lanyard makes the ears comfortable to wear, and the ears are not easy to feel pain and discomfort when worn for a long time.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The structure, size, installation position and shape of each component can be changed. On the basis of the technical solution of the present invention, improvements and equivalent transformations of individual components according to the principles of the present invention should not be excluded from the present invention Outside the scope of protection.

Claims

A new airtight protective mask is characterized in that it includes:

A mask body is provided with at least one outer layer, one middle layer and one inner layer in sequence;

At least two airtight sheets are respectively fixed on both sides of the mask body, and each of the airtight sheets includes a fixing portion and an adhesion portion extending from the fixing portion, the fixing portion is wrapped in One side of the mask body is fixed to the outer layer and the inner layer, and the adhesion part is arranged in a direction corresponding to the inner layer;

Two fixed area groups, each of which is connected to 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 The fixed areas are respectively welded to the mask body corresponding to the upper and lower ends of the adhesion part;

And a lanyard set, including two lanyards, the two lanyards are respectively connected to both sides of the mask body.
A new airtight protective mask according to claim 1, characterized in that the airtight sheet has a single-layer or multi-layer structure.
A new airtight protective mask according to claim 2, characterized in that: the wrinkle section of the mask body is omega or zigzag.
A new air-tight protective mask according to claim 3, characterized in that the hanging strap group is located on the outer layer or the inner layer and is arranged toward the inside of the mask body.
A new airtight protective mask according to claim 1 or 2 or 3 or 4, characterized in that the airtight protective mask further comprises an upper airtight sheet fixedly connected to the upper side of the mask body.
A new airtight protective mask according to claim 5, characterized in that the airtight protective mask further comprises a lower airtight sheet fixedly attached to the lower side of the mask body.
A new airtight protective mask according to claim 1 or 2 or 3 or 4, wherein the mask body is formed with two longitudinal folds.
A new gas-tight protective mask according to claim 7, wherein the gas-tight protective mask further comprises an exhalation valve, which is installed on the mask body.
A new air-tight protective mask according to claim 1 or 2 or 3 or 4, characterized in that the air-tight protective mask further comprises an insertion type nose pad, which is provided on the upper part of the mask body Between the inner layer and the outer layer.