CN109222282B

CN109222282B - Mask

Info

Publication number: CN109222282B
Application number: CN201811437600.9A
Authority: CN
Inventors: 林先霞; 郑海涛
Original assignee: Individual
Current assignee: Lin Xianxia
Priority date: 2014-12-28
Filing date: 2014-12-28
Publication date: 2021-01-15
Anticipated expiration: 2034-12-28
Also published as: CN109222282A; CN109222281B; CN109222281A; CN105476114B; CN105476114A

Abstract

The invention discloses a mask, which comprises at least one layer of filter sheet, wherein the filter sheet is connected with a fixing belt, and the mask is characterized in that the filter sheet is provided with at least one zigzag primary folding, at least one zigzag secondary folding is arranged in a way of crossing the primary folding, the primary folding and the secondary folding adopt an X-shaped crossing structure, the primary folding is vertical to the secondary folding, the folding part of the primary folding and the secondary folding is overlapped with one diagonal line of the filter sheet, and the filter sheet is bonded at the peripheral edge of the mask after being folded; the micro-particle permeation probability caused by large local pressure difference of the filter sheet is reduced.

Description

Mask

Technical Field

The invention relates to a mask, in particular to a three-dimensional folding mask, which is a divisional application of an invention patent application with the application number of 201410825423.7, the application date of 2014, 12 and 28 and the invention name of 'three-dimensional low-pressure folding mask'.

Background

With the improvement of health consciousness of people, the mask is used as a protection tool which is widely distributed in various fields of life, such as medical treatment, chemical industry, furniture manufacturing and other industries, and people who cause environmental pollution in the industrial process have to take the mask to go out to avoid haze damage. The existing masks are various, the most common mask mainly comprises a sheet type mask and a folding mask, the sheet type mask is formed by tiling and stacking a plurality of layers of filter sheets, the folding mask is formed by arranging a plurality of horizontal folds on the sheet type filter sheets, the folding mask can be pulled up and down when being worn, and because the length of each folding horizontal direction is equal to the horizontal length of the upper edge and the lower edge of each filter sheet, and the folding length is not adjustable, a larger longitudinal depth space cannot be obtained after the folding mask is pulled up and down under the limitation of the folding length, the areas of the two filter sheets are smaller, and the inner surfaces of the filter sheets with small longitudinal depth space can be locally contacted with a human face when being worn, so that the effective filtering; when the two masks are worn, the filter sheet can be slightly stretched, the mouth and the nose are close to the inner surface of the filter sheet, so that the pressure difference between the inside and the outside of the filter sheet facing the mouth and the nose is higher than that far away from the mouth and the nose, the unbalanced pressure distribution causes the air flow and the dust deposition quantity of each part of the filter sheet to be different, the filter sheet cannot be balanced to exert the filtering efficiency, the high-pressure difference, the high-flow and the high-dust deposition position are opposite to the mouth and the nose, the permeation probability of microparticles on the filter sheet facing the mouth and the nose under the drive of high-speed air flow is greatly increased, the impact force of the air flow on the filter sheet during breathing is large due to the close distance of the filter sheet to the mouth and the nose, the permeation probability of the microparticles is increased due to vibration deformation, the filter sheet is; the two masks are finally implemented through a filter sheet, the performance of the masks is mainly embodied on the isolation effect of the filter sheet, the filter sheet is mostly modified at present for improving the filtration performance, when some tiny particles need to be isolated, the traditional method is to reduce the size of micropores of the filter sheet, but the traditional method has disadvantages, when the micropores are reduced to be small, the airflow is not smooth and has a feeling of suffocation, and the pressure difference between the inner side and the outer side of the filter sheet is not reduced, because the total ventilation area is reduced and the airflow velocity at the micropores is increased, the smaller microparticles adhered to the filter sheet under the drive of high-speed airflow can also pass through the micropores to enter respiratory tracts, and the performance is particularly prominent on the filter sheet with smaller area; these problems remain to be improved by technological improvements.

Disclosure of Invention

The invention provides a three-dimensional folding mask, aiming at providing a mask with a large filtering area of a filter sheet and small pressure difference at each position.

The technical scheme adopted by the invention is as follows: a three-dimensional folding mask comprises at least one layer of filter sheet, wherein the filter sheet is connected with a fixing band, and is characterized in that the filter sheet is provided with at least one zigzag primary folding line, at least one zigzag secondary folding line is crossed with the primary folding line, and the periphery of the folded filter sheet is bonded.

Furthermore, the secondary folding is vertical even number, the even number is folded and evenly divided into two groups, the two groups of secondary folding are respectively positioned at two sides of the vertical central line of the filter, the two groups of secondary folding are symmetrically distributed by taking the vertical central line of the filter as an axis, and the secondary folding at the left side and the secondary folding at the right side are both parallel to the vertical central line of the filter.

Furthermore, the secondary folding is vertical even number, the even number is folded and evenly divided into two groups, the two groups of secondary folding are respectively positioned at two sides of the vertical central line of the filter sheet, the two groups of secondary folding are symmetrically distributed by taking the vertical central line of the filter sheet as an axis, and the left secondary folding and the right secondary folding are distributed in a splayed shape.

Furthermore, the secondary folding is an even number of folds which are at least four in the vertical direction, the even number of folds are evenly divided into two groups, the two groups of folds are respectively positioned at two sides of the vertical central line of the filter sheet, the two groups of folds are symmetrically distributed in the left-right direction by taking the vertical central line of the filter sheet as an axis, and the adjacent folds in the two sides are distributed in a splayed shape.

Furthermore, the first folding and the second folding are obliquely arranged by taking the vertical central line of the filter sheet as a datum line, and included angles formed by the first folding and the second folding and the vertical central line of the filter sheet are the same.

Further, the width of one end of the folded part of the secondary folding is larger than that of the other end.

Furthermore, the filter sheets are more than two layers, and after the filter sheets are overlapped, the filter sheets are folded for the first time and then folded for the second time.

Furthermore, the filter sheets are more than two layers, the filter sheets are divided into more than two stacked layers, and the stacked layers are folded once and overlapped together respectively and then folded twice at the same time.

Furthermore, the filter sheets are more than two layers, the filter sheets are divided into more than two stacked layers, and the stacked layers are respectively folded once and folded twice and then overlapped together.

Furthermore, an airflow blocking piece is arranged at the oral-nasal part on the inner side of the filter piece, a gap is reserved between the airflow blocking piece and the inner surface of the filter piece, and one side or two sides of the airflow blocking piece are connected with the side edge of the filter piece.

Furthermore, the inner side of the filter sheet is provided with a stretching support sheet, the stretching support sheet is composed of a left section and a right section, the left side of the left section is fixed on the left side of the filter sheet, the right end of the left section is provided with a through hole matched with the width of the right section, the right section is arranged in the through hole, the right side of the right section is fixed on the right side of the filter sheet, the left end of the right section is provided with a limit raised head which is wider than the through hole, and the right section is provided with a ratchet fin which can be clamped with the through.

Furthermore, the filter sheet is provided with more than three folds on the basis of primary folding and secondary folding, each fold at least needs to be crossed with the previous fold, and the folds are bonded at the peripheral edges of the mask.

The invention sets crossed primary folding and secondary folding on the mask filter sheet, when in use, the folding position is pulled outwards, a cavity can be formed in front of the mouth and nose, because the primary folding can be stretched in the crease line direction, the obtained cavity has larger depth and steep edge, most of the pulled filter sheet has folds, the space between the filter sheet and the face is enlarged and limited, when in use, only the bonding part around the filter sheet is contacted with the face, the contact area of the filter surface of the filter sheet and the face is small, the filter sheet is not oppressed to be worn comfortably, the distance between the mouth and the nose and the inner surface of the filter sheet is enlarged, the impact influence of the respiratory airflow on the filter sheet is reduced, the filter sheet deforms along with the respiratory airflow and is small, the filter sheet is not sucked to the nostril when in inhalation, the internal and external pressure difference of each part of the filter sheet is relatively balanced, the filtering efficiency of each part of the filter sheet is exerted in balance, and the probability of micro-particle, the three-dimensional structure can increase the effective filtering area of the filter, reduce the pressure difference between two sides of the micropores of the filter during breathing, reduce the airflow velocity at the micropores, greatly reduce the probability that smaller microparticles adhered to the filter pass through the micropores, effectively reduce the deformation of the filter during breathing, increase the gas exchange quantity inside and outside the filter during breathing and improve the oxygen concentration in the inner cavity.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a third structure according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a fourth embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a fifth embodiment of the present invention.

Fig. 6 is a schematic diagram of a sixth structure according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a seventh embodiment of the present invention.

Fig. 8 is a schematic structural view of an eight-stretching support sheet according to an embodiment of the invention.

FIG. 9 is a schematic cross-sectional view along a vertical centerline according to an embodiment of the present invention.

FIG. 10 is a schematic view of a staggered "" folded configuration of the filter of the present invention.

FIG. 11 is a schematic view of a folded structure of the filter sheet according to the present invention.

FIG. 12 is a schematic view of a filter sheet with a folded structure of reverse "" shape.

Fig. 13 is a schematic structural diagram of a tenth embodiment of the present invention.

Number designation in the figures: 1, a filter disc; 2, folding for one time; 3, secondary folding; 4, fixing the belt; 5, a left section; 6, a right section; 7, passing through the hole; 8, limiting a raised head; 9, thorn wings; 10 airflow blocking sheets; 11 three folds.

Detailed Description

In the embodiment of the invention, as shown in figure 1, the three-dimensional folding mask is provided with a layer of filter sheet 1, a zigzag primary folding 2 is arranged on the filter sheet and is crossed with the primary folding to form a zigzag secondary folding 3, the periphery of the folded filter sheet is bonded, a fixing belt 4 is connected on the filter sheet, the primary folding and the secondary folding adopt a cross structure of a transverse cross structure and a vertical cross structure, when in use, the middle folding position is pulled outwards to form a cavity in front of the mouth and nose, most of the pulled filter sheet still has folds, so the space between the filter sheet and a human face is enlarged and limited, the good circulation of airflow is facilitated to be formed, the folds can also ensure that the cavity structure of the filter sheet is stably reduced and deformed along with the respiratory airflow, when in use, only the bonding part around the filter sheet is contacted with the human face, the contact area of the filter sheet and the human face is small, the wearing comfort is realized, only the, the distance between the mouth and the nose and the inner surface of the filter disc is increased, the impact influence of respiratory airflow on the filter disc is reduced, the deformation along with the respiratory airflow is small, the respiratory airflow cannot be sucked to nostrils when the respiratory airflow inhales, the internal and external pressure difference of each part of the filter disc is relatively balanced, the filtering efficiency of each part of the filter disc is balanced and exerted, the probability of micro-particle permeation caused by large local pressure difference of the filter disc is reduced, the effective filtering area of the filter disc can be increased by the three-dimensional structure, the pressure difference on two sides of micropores of the filter disc during respiration is reduced, the airflow velocity at the micropores is low, the probability of smaller micro-particles adhered to the filter disc passing through the micropores is greatly reduced, and the service time of the; and the reduction of the pressure difference at the two sides of the micropores of the filter can also effectively reduce the deformation of the filter during respiration, thus increasing the gas exchange quantity inside and outside the filter during respiration and improving the oxygen concentration in the inner cavity.

As shown in fig. 2, the second embodiment of the invention is different from the first embodiment in that the first folding and the second folding adopt an x-shaped cross structure, and the included angles formed by the first folding and the second folding and the vertical central line of the filter are the same, so that the second embodiment of the invention has the same beneficial effects as the first embodiment of the invention and is more symmetrical left and right.

In the first and second embodiments of the invention, the first folding and the second folding are both one, and the filter sheet is a layer, which is only one expression form of the invention, and the number of the first folding and/or the second folding can be more than one, and the first folding and/or the second folding can be respectively arranged according to the requirements, such as two or three or even more, so that the expanded space is larger, the shape is more regular, and the structure is more stable; the filter sheet may be provided in multiple layers, such as two or three or even more layers, depending on the filtration needs.

The third embodiment of the invention is shown in fig. 3, the three-dimensional folding mask is folded twice into four vertical folds, which are divided into two groups of left folds and two groups of right folds, wherein the two groups of left folds and the two groups of right folds are respectively positioned at two sides of a vertical central line of a filter sheet, the two groups of secondary folds are symmetrically distributed left and right by taking the vertical central line of the filter sheet as an axis, the secondary folds at the left side and the right side are both parallel to the vertical central line of the filter sheet, the primary folds are three horizontal folds, the filter sheets are three layers, the primary folds are simultaneously carried out after the three layers of filter sheets are overlapped, the secondary folds are carried out again, the middle parts of the primary folds and the secondary folds are outwards pulled when the; in specific implementation, the number of the secondary folding paths can also be other even number paths, such as two, six or even more even number paths, the two even number paths are divided into two groups and symmetrically distributed on two sides of the vertical central line of the filter sheet, and each secondary folding path is parallel to the vertical central line of the filter sheet; the number of the secondary folding channels can also be an odd number not less than 3, one of the channels is distributed on the vertical central line of the filter, and the others are still divided into two groups and symmetrically distributed on two sides of the vertical central line of the filter.

In the fourth embodiment of the invention, as shown in fig. 4, the three-dimensional folding mask is folded into four transverse lines at one time, and folded into six vertical lines at the second time, and adopts a positive and negative zigzag folding structure.

In the fifth embodiment of the present invention, as shown in fig. 5, the three-dimensional folding mask is folded twice into six vertical folds, which are divided into two groups, wherein three parallel left folds are one group, three parallel right folds are one group, two groups of two secondary folds are respectively located at two sides of the vertical center line of the filter, the two groups of secondary folds are symmetrically distributed around the vertical center line of the filter, the two groups of secondary folds are distributed in a splayed shape between the two secondary folds at the left side and the two secondary folds at the right side, the primary folds are four horizontal folds, and the four layers of filter are folded once and then folded twice. When the filter is used, the middle parts of the primary folding and the secondary folding are unfolded, a larger space is obtained, the effective filtering area of the filter sheet is further increased, meanwhile, the three-dimensional structure of the unfolded filter sheet is more stable due to the splayed distribution structure, and the trend of the primary folding can be changed due to the splayed distribution structure, so that the integral three-dimensional space is more suitable for the face shape of a person; similarly, the number of the secondary folding channels in the specific implementation of this embodiment may also be other even number channels, such as two, four or even more even number channels, which are divided into two groups and symmetrically distributed on two sides of the vertical center line of the filter sheet in the shape of "eight"; the number of the secondary folding channels can also be an odd number not less than 3, one of the channels is distributed on the vertical central line of the filter, and the others are still divided into two groups which are symmetrically distributed on two sides of the vertical central line of the filter in a shape like a Chinese character 'ba'.

As shown in fig. 6, the sixth embodiment of the invention is different from the fourth embodiment in that two groups of secondary folds are distributed in a splayed shape, and adjacent secondary folds in each group are arranged in a splayed shape, so that the trend of the primary folds can be further adjusted, and the space and the specific shape of the expanded filter sheet are more suitable for the shape of the face of a person.

In the seventh embodiment of the invention, as shown in fig. 7, the first folding and the second folding of the three-dimensional folding mask are respectively arranged in an inclined manner by taking the vertical center line of the filter as a reference line, and the included angles formed by the first folding and the second folding and the vertical center line of the filter are the same, and the first folding and the second folding have three times respectively, so that the space after the three-dimensional folding mask is unfolded is larger, and the effective filtering area is larger.

In an eighth embodiment of the invention, as shown in fig. 8, after the filter sheet of the three-dimensional folding mask is folded twice in a crossed manner, a stretching support sheet is arranged on the inner side of the filter sheet, the stretching support sheet is composed of a left section 5 and a right section 6, the left side of the left section is fixed on the left side of the filter sheet, the right end of the left section is provided with a through hole 7 matched with the right section in width, the right section is arranged in the through hole, the right side of the right section is fixed on the right side of the filter sheet, the left end of the right section is provided with a limit raised head 8 wider than the through hole, the right section is provided with a ratchet fin 9 capable of being clamped with the through hole adjacent to the limit raised head, when the mask is not used, the left end of the right section is superposed with the left section, when the mask is used, the left end superposed part of the right section is pulled outwards through the through hole, the ratchet fin is clamped with the, and full ventilation is realized.

In an embodiment of the present invention, as shown in fig. 9, after the three-dimensional folding mask filter sheet is folded twice in a crossed manner, an airflow blocking piece 10 is disposed at an oral-nasal portion inside the filter sheet, a gap is left between the airflow blocking piece and an inner surface of the filter sheet, the airflow blocking piece is made of a hard material, can maintain a certain stable shape, and is connected to an upper edge of the filter sheet, so that airflow can be effectively prevented from directly impacting the filter sheet. When the air flow baffle plate is implemented, the air flow baffle plate can be made of air-permeable materials or air-impermeable materials, such as hard plastic sheets or soft filter sheets, two ends of the air flow baffle plate can be respectively connected with the upper side and the lower side of the filter sheet, and two ends of the air flow baffle plate can also be respectively connected with the left side and the right side of the filter sheet, so that the stability is improved.

As shown in fig. 13, the filter sheet of the three-dimensional folding mask is provided with three folds 11 on the basis of primary folding and secondary folding, each fold at least needs to be crossed with the last fold, namely, the secondary folding needs to be crossed with the primary folding, and the third folding needs to be crossed with the secondary folding. In the embodiment, the folding for one time and three times can not be crossed, the folding for one time, the folding for two times and three times can also be more than two times to form a nesting ring, the folding for one time, the folding for two times and three times is only carried out for three times, in order to obtain a larger effective filtering area or a three-dimensional space with more folds, the folding for four times or even more than five times can also be carried out on the basis of the folding for three times, wherein each folding at least needs to be crossed with the previous folding, each folding can be one or more times, and each folding is adhered to the peripheral edge of the mask.

When the filter is implemented, the number of the filter sheets is more than two, and when primary folding and secondary folding are carried out, the filter sheets on each layer can be simultaneously folded for the first time and then folded for the second time after being overlapped; or the filter sheet can be divided into more than two stacks, and each stack is folded once and then overlapped together, and then is folded twice at the same time; the filter sheet can be divided into more than two stacks, and each stack is folded once and folded twice respectively and then overlapped together; each of the stacked layers may be formed of one or more layers of filter sheets. In a first folded and then overlapped stack, the inner stack fold area may be less than the outer stack fold area.

The folding parts of the secondary folding are equal in width, one end of the folding part of the secondary folding can be wider than the other end of the folding part of the secondary folding during implementation, the trend of the primary folding can be adjusted, and the space and the specific shape of the unfolded filter sheet are more suitable for the face shape of a person.

When the primary folding or the secondary folding is larger than the continuous two-way arrangement in the implementation of the invention, the folding structure can adopt staggered zigzag folding, as shown in figure 10, the adjacent folding laminated positions are staggered, the first to the third embodiments are the structure, the primary folding or the secondary folding at the non-intersection part does not exceed the third folding, and the whole thickness is more uniform; overlapping zigzag folding can also be adopted, as shown in FIG. 11, the positions of adjacent folding layers are overlapped, the first folding or the second folding thickness penetrating the non-intersection position exceeds three folding, and the unfolding area is large; the folding in a reverse zigzag manner can be adopted, as shown in FIG. 12, the folding in a reverse zigzag manner is adjacent, and the fourth embodiment is the structure, so that the expanded shape is more regular due to strong symmetry; the specific folding structure can be selected according to different requirements, the folding structure can be folded in a superposed 'Z' -shape when the required unfolding area is large, and the folding structure can be folded in other two types when the required unfolding area is common.

When the airflow blocking piece is implemented, the airflow blocking piece can be transverse, two ends of the airflow blocking piece are connected with the left side edge and the right side edge of the filter sheet, and when the airflow blocking piece is made of a flexible material sheet such as a plastic sheet, one end of the airflow blocking piece is connected with the side edge of the filter sheet; the filter disc can be provided with a one-way breather valve to improve the breathing and air exchange efficiency; the support sheet can also be arranged in an interlayer between adjacent filter sheets and is hidden to prevent scraping and collision; the support sheet can be provided with air holes to reduce air flow blockage; the airflow baffle plate can be provided with small-hole airflow; the two groups of secondary folding which are distributed in the shape of the Chinese character 'ba' can also be distributed in the shape of the inverted Chinese character 'ba'; when each group of secondary folding is more than three, the adjacent secondary folding in each group are arranged in a continuous ' splayed ' shape, also can be arranged in a continuous inverted ' splayed ' shape, and also can be arranged in a positive and inverted splayed ' shape, so that the adjustment of different structural shapes can be realized.

In order to obtain a three-dimensional space which is better adapted to the face shape, the folding widths of the first folding and the second folding can be different to obtain the required size, and other folding methods such as a zigzag folding method can be adopted besides the three zigzag folding methods.

The mask can be folded and stored along the connecting part of the two filter sheets, and can be unfolded to form a three-dimensional bowl shape to be worn when in use. The mask can also be used for a multi-piece structure mask with a filter sheet larger than two filter sheets, and is used for further enlarging the filter area. Because the multi-piece structure mask originally has a three-dimensional space, the multi-piece structure mask can be folded once, and the longitudinal or transverse structure can be adopted for one-time folding, so that the filtering area is increased.

When the mask is implemented, the filter sheet can be provided with a strip-shaped support, the support can be a support strip adhered to the filter sheet, can also be a solid adhesive tape, can also be a filter sheet heat hardening strip and is used for supporting and keeping the shape stability of the mask, and the filter sheet can also be provided with a net-shaped support for keeping the structure stability; a shape-retaining mesh such as non-woven fabric, metal mesh, plastic mesh, etc. can be arranged on the filter sheet, and the non-woven fabric or melt-blown non-woven fabric with shape-retaining function can be directly used as the filter sheet.

When the invention is implemented, the filter sheet can adopt a carbon filter material with high adsorbability, an electrostatic filter material, a chemical filter material or a melt-blown filter material, the filter sheet can adopt a detachable structure and is connected with a frame around the mask, the frame can adopt a colloid material with soft texture, the frame can also adopt a plastic material with better toughness and elasticity as a keel surface coated with the colloid material with soft texture, the connection can adopt a connection mode that a pressing strip is used for pressing the filter sheet into a clamping groove of the frame, the connection can also adopt a connection mode that a clamping plate type frame clamps the filter sheet, the connection can also adopt a connection mode that concave-convex buckles are respectively arranged on two connecting bodies for sealing, the concave-convex buckles can be plastic or colloid materials, the frame can be used for a long time, only the filter sheet needs to be replaced, the invention is not only suitable for, avoids resource waste, and is economic and environment-friendly.

When the invention is implemented, the folding widths of the folding of the primary folding and the secondary folding can be different, so that the shape after unfolding is more suitable for the face shape, namely, a gap is kept between the folding and the face, and the gap is not too large. If the middle part is folded to be wider and the two sides are narrower, the nasal part space is larger, small gaps are kept between the periphery and the face, the filtering area is large, and the volume of the inner space is smaller, so that the breathing and the ventilation are facilitated.

The mask is simple in structure, easy to process, remarkable in effect and suitable for popularization and application, and a technical revolution is certainly brought to the mask industry.

In summary, the preferred embodiments of the present invention are described, and all equivalent modifications and additions made by the present application are considered to be within the technical scope of the present invention; the invention can combine the above technologies according to specific needs.

Claims

1. The utility model provides a mask, includes at least one deck cassette, is connected with the fixed band on the cassette, and its characterized in that is equipped with the one at least style of calligraphy one time folding of "and once folds the style of calligraphy secondary folding that is equipped with one at least style of calligraphy alternately, and the one time is folded and is located the upper edge and the lower edge of cassette respectively with the two ends of secondary folding, and the one time is folded, and the secondary folding is the contained angle the same with the vertical central line of cassette, and the cassette is folding back and is bonded in mask edge all around.

2. The mask of claim 1 wherein the width of the folded portion of the secondary fold is greater at one end than at the other end.

3. The mask according to claim 1, wherein the number of the filter is two or more, the filter is divided into two or more stacked layers, and the stacked layers are folded once and then overlapped together, and then folded twice.

4. The mask according to claim 1, wherein said filter is formed in two or more layers, and said filter is divided into two or more stacked layers, each of which is folded once and folded twice and then overlapped together.

5. The mask according to any one of claims 1 to 4, wherein the inner side of the filter is provided with an airflow blocking piece at the mouth and nose part, a gap is left between the airflow blocking piece and the inner surface of the filter, and one side or two sides of the airflow blocking piece are connected with the side edge of the filter.

6. The mask according to any one of claims 1 to 4, wherein the inner side of the filter sheet is provided with a stretching support sheet, the stretching support sheet comprises a left section and a right section, the left section is fixed on the left side of the filter sheet, the right end of the left section is provided with a through hole with a width matched with that of the right section, the right section is arranged in the through hole, the right side of the right section is fixed on the right side of the filter sheet, the left end of the right section is provided with a limit raised head wider than the through hole, and the right section adjacent to the limit raised head is provided with a ratchet fin capable of being clamped with the.