CN111449319A - One-way air passage combined mask and preparation method thereof - Google Patents
One-way air passage combined mask and preparation method thereof Download PDFInfo
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- CN111449319A CN111449319A CN202010262219.4A CN202010262219A CN111449319A CN 111449319 A CN111449319 A CN 111449319A CN 202010262219 A CN202010262219 A CN 202010262219A CN 111449319 A CN111449319 A CN 111449319A
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
- A41D13/1107—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape
- A41D13/1138—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a cup configuration
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
- A41D13/1161—Means for fastening to the user's head
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D27/00—Details of garments or of their making
- A41D27/28—Means for ventilation
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41H—APPLIANCES OR METHODS FOR MAKING CLOTHES, e.g. FOR DRESS-MAKING OR FOR TAILORING, NOT OTHERWISE PROVIDED FOR
- A41H42/00—Multi-step production lines for making clothes
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
The invention relates to a mask and a preparation method thereof, in particular to a one-way air passage combined mask and a preparation method thereof, and belongs to the technical field of protective materials. The mask comprises a mask body and a hanging rope, wherein the mask body is composed of a frame and a filter layer which covers and is fixed outside the frame, the frame is composed of a support frame matched with the shape of the mouth and nose of a person, an isolation layer which is fixed on the support frame and extends outwards and a sealing gasket which is fixed along the circumferential direction of the support frame, the isolation layer is positioned between the mouth and the nose, the mask body is divided into a dry area and a wet area, the dry area is composed of the isolation layer, the support frame and an upper filter layer, the wet area is composed of the isolation layer, the support frame and a lower filter layer, and a channel is arranged on the. The advantages are that on the premise of ensuring the filtering efficiency, the usage amount of 2/3 electrostatic melt-blown adhesive non-woven fabric can be reduced, and the service time of the mask can be prolonged; not only reduces the cost, but also can relieve the problem of shortage of raw materials.
Description
Technical Field
The invention relates to a mask and a preparation method thereof, in particular to a one-way air passage combined mask and a preparation method thereof, and belongs to the technical field of protective materials.
Background
The mask is used in various industries as a common protective article, and the protection requirements of different industries and environments on the mask are different. For medical masks, it is mainly a self-priming filtering mask. The protective effect is mainly based on the filtering effect of the mask on harmful substances, the filtering efficiency of the mask on the harmful substances is high, the better the protective effect of the mask is, and the worse the protective effect of the mask is, the worse the protective effect of the mask is. The medical mask filters particles in air, and also needs to block virus aerosol, spray, blood, body fluid and secretion, so that the requirement on a filter layer is high. The filtering layer of the medical mask is made of spray-melted non-woven fibers. Research shows that the filtration layer of the spray-melted non-woven material passes through the electrostatic electret, so that the filtration efficiency is increased to 60-88% from the original 20-35%, and particularly, the electrostatic effect of the filtration layer can intercept particles and aerosol with the particle size of less than 0.3 um. Electrostatic attraction deposition plays a very important role in filtration efficiency. But the static residence of the filter layer decreases rapidly with increasing filter layer moisture content. When people wear the mask, the moisture content of the filter layer is increased due to the fact that the moisture exhaled by the user passes through the filter layer, and therefore after hours, the filtering effect of the mask on tiny particles is greatly reduced and the mask cannot be used. The filtering efficiency of the mask can be kept by keeping the filtering layer dry, so that the service life of the mask can be prolonged by keeping the mask dry. Another advantage of maintaining the filter dry is that the breathing resistance of the filter is inversely proportional to the humidity of the filter, the greater the humidity, the greater the breathing resistance, the more difficult it is for a person to breathe, so keeping the filter dry also improves the comfort of the mask in use. The key components of the medical mask are multi-layer spray-melting non-woven fabrics with static electricity, and the production efficiency of the spray-melting non-woven fabrics is low and the yield is low. At present, the non-coronary pneumonia virus moves transversely, and the main reason of the lack of the mask is the lack of electrostatic melt-blown adhesive non-woven fabrics. The price of the spray melt adhesive non-woven fabric which can be used for the medical mask at present is increased from one ton to 50 ten thousand yuan, and the supply is not in demand. On the premise of ensuring the protective efficiency of the mask, the reduction of the dosage of the electrostatic spray-melt non-woven fabric is very necessary. The structure and design of the existing mask can not meet the requirement.
Disclosure of Invention
The invention aims to provide a combined mask and a preparation method thereof aiming at the defects of short service time of the mask and shortage of supply caused by more consumption of electrostatic spray-melted non-woven fabrics in the prior art, so that the filtering effect of the mask is improved, the service time is prolonged, and the consumption of the spray-melted non-woven fabrics is reduced.
The invention solves the technical problem by the following technical scheme: a one-way air passage combined mask comprises a mask body and a hanging rope, wherein the mask body is composed of a frame and a filter layer covering the frame; the frame consists of an annular support frame capable of containing the mouth and the nose of a person, a crescent-shaped isolation layer fixed in the middle of the support frame and extending outwards, and a sealing gasket for attaching the periphery of the support frame to the face of the person; the inner side of the isolation layer can be transversely attached to the mouth and the nose, and the outer side divides the filter layer into an upper filter layer forming a dry area and a lower filter layer forming a wet area; the dry area and the wet area are communicated through a one-way channel of an isolation layer below the nostrils.
The isolating layer is a one-way isolating layer and comprises a horizontal isolating surface, a framework fixed on the periphery of the isolating surface, a channel with a directional valve and positioned at the nasal cavity on the surface of the isolating surface, a silica gel pad positioned on one side of the isolating surface, which is attached to the human face, a filtering layer slot positioned on one side of the isolating surface, which is away from the human face, and a pressing strip matched with the slot. The pressing bar can rotate up and down. Before the filter layer is inserted, the pressing strip is opened to adhere the filter layer to the outer side of the isolation layer framework, then the pressing strip is pressed down to apply pressure to the filter layer, so that the filter layer can be tightly adhered to the inner wall of the support frame, and the filter layer is fixed.
Furthermore, the channel is a one-way channel, one side of the channel, which is close to the wet area, is provided with a directional valve which can rotate up and down, and the directional valve is a thin valve plate. Except the channel area, the other parts of the isolation surface of the isolation layer are solid bodies, and the dry area and the wet area are separated. Clean and dry air flows in the dry area from outside to inside, and exhaled air flows in the human body in the wet area from inside to outside. The dry area and the wet area are formed by the one-way isolation layer of the mask frame, and the opening and closing of a sheet valve arranged at the passage port of the isolation layer are realizedNow the dry zone gas flows to the wet zone, and the wet zone gas can not enter the dry zone. When the nasal cavity exhales, the airflow passes through the one-way passage from top to bottom. Since the inner diameter of the channel in the dry zone decreases with the direction of the gas flow, its flow rate increases and its pressure decreases according to the bernoulli equation (P1 > P2, and PDry matterP1 is more than P2), the valve plate A rotates downwards to open the channel. The gas stream enters the wet zone from the dry zone. When the nasal cavity inhales, namely air in a wet area flows from the wet area to a dry area through the channel, the valve plate A is rotated upwards to close the channel by the same reason that the valve plate A is more than P3 and more than P2, the air is prevented from flowing into the dry area from the wet area, and one-way air through-flow is realized. The framework maintains the shape of the isolation layer; the slots and the battens are used for fixing the filtering layer in the dry-wet area; the isolation layer divides the space between the mask filtering layer and the face into an upper dry area and a lower wet area; the air circulation between the dry area and the wet area can be realized only through the Venturi channel of the isolation layer; the outermost silica gel pad is used for ensuring that the isolating layer is tightly attached to the face to realize the sealing effect.
The channel structure of the invention may also be in the form of: the one-way channel is provided with an elastic valve plate which can be opened downwards. When exhaling, the elastic valve plate can only be opened downwards, the air in the dry area is brought into the wet area by means of the exhaling airflow, and the elastic valve plate is reset when inhaling, so that the air in the wet area is prevented from flowing into the dry area.
The invention has the further perfection that: the one-way passage is equipped with the venturi channel that can open the elastic valve piece down, the venturi channel has the expansion mouth and the absorption mouth that is located upper end path department down, the absorption mouth is through the dry district intercommunication of side straw and isolation layer top. The pressure generated during expiration will generate negative pressure P at the adsorption port due to the Venturi effect0Sucking dry zone air (P)4＞P0) Therefore, fresh air is supplemented into the dry area during expiration, and the dry area air during inspiration is cleaner.
The support frame is composed of a support framework matched with the face shape, slots which are distributed along the circumferential direction of the face shape support framework and used for fixing the filter layer and pressing strips matched with the slots, the outer edges of the filter layer in the dry area and the filter layer in the wet area are respectively inserted into the slots of the support frame, the pressing strips are closed, and the pressing strips apply pressure to the filter layer, so that the filter layer is tightly bonded with the support frame.
The upper filtering layer is a dry area filtering layer and consists of an outer layer with a waterproof function and an inner layer with a filtering function, the material of the inner layer is determined according to the protection grade requirement, and a pressure-sensitive adhesive tape is attached to the inner side of the outer edge of the dry area filtering layer. The filtering layer of the dry area is a key component for filtering the outside harmful substances of the mask. Because the filter layer is not contacted with the face and does not need to absorb the vapor exhaled by the nasal cavity, the nasal cavity breathing mask is only composed of an outer waterproof layer and an inner filter layer. The filter material used in the filter layer is determined by the protection class. The mask can be replaced according to the change of protection requirements, and different filter layers are adopted to combine different types of protective masks. Medical meltblown nonwovens are used primarily in this area. The spray-melting non-woven fabric with the SMS and SMMMS structure can be flexibly replaced according to the protection grade requirement. The area of the area only occupies 1/3 of the whole area of the mask, so that a large amount of medical spray-melted non-woven fabrics can be saved.
The lower filtering layer is a wet area filtering layer and consists of an outer layer with a waterproof function and an inner layer with a moisture absorption function, and a pressure-sensitive adhesive tape is attached to the inner side of the outer edge of the wet area filtering layer. The gas filtered by the wet area filtering layer is mainly the moisture exhaled by the wearer. The gas flow direction in the area is from inside to outside, and the requirement on the filtering efficiency is not high, but the requirement on the moisture absorption efficiency is high. The moisture absorption layer is made of high moisture absorption fiber materials. The structure of the breathable fabric can be composed of an outer waterproof layer and an inner moisture absorption layer, and the breathable fabric has a good breathable effect. The area of the filtering layer occupies 2/3 of the whole mask and does not need to be changed according to the change of the protection requirement.
The sealing gasket is a silica gel gasket and is mainly contacted with the face. The periphery of the mask can be tightly attached to the face (nose bridge, cheeks and lower jaw), the sealing effect of the mask is guaranteed, and meanwhile, the discomfort of the face can be reduced.
The invention further provides a preparation method of the combined mask, which comprises the following steps:
fixing the isolation layer on the support frame near the position between the mouth and the nose, and manufacturing a sealing gasket into a mask frame;
step two, preparing filter sheets of a dry area and a wet area which are in accordance with the size of the frame according to the size of the frame, wherein the inner side of the outer edge of each filter sheet is attached with a pressure-sensitive adhesive tape;
thirdly, selecting dry area filter sheets with different filtering efficiencies according to different protection requirements, inserting the outer edges of the filter sheets with pressure-sensitive adhesive into slots on the dry area mask frame and the isolation layer, pressing a pressing strip, and fixing the pressing strip on the dry area frame;
fixing the wet area filter sheet on the wet area mask frame and the isolation layer according to the installation method of the dry area filter sheet, and finishing the preparation of the mask body;
and fifthly, fixing hanging ropes at two sides of the mask body, adjusting the hanging ropes to enable the silica gel pads at the inner sides of the isolation layers to be tightly attached between the nose and the upper lip, enabling the silica gel pads at the periphery of the mask support frame to be tightly attached to the face, and forming an upper dry area and a lower wet area inside the mask.
In the method, the surface of the pressure-sensitive adhesive tape is attached with the isolating film, and when the pressure-sensitive adhesive tape is used, the isolating film is torn off, the pressure-sensitive adhesive tape is inserted into the slot and is pressed tightly by the pressing strip.
Furthermore, the inner layer material of the dry area filter sheet adopts corresponding layers of electrostatic spray-melt non-woven fabrics according to the filtering requirements, or adopts an air-impermeable material, and an air inlet used for connecting a portable air filter is arranged on the air-impermeable material.
The invention provides a mask frame structure, wherein a horizontal isolation layer of the structure divides a space between a mask filtering layer and a face into a dry area and a wet area; through the setting of the structure of one-way air flue, keep the dry degree of dry zone air, realize that the dry zone filter layer keeps dry for a long time, obtain from this and under keeping the filtration efficiency prerequisite, prolong gauze mask live time effect. As a further benefit, the glasses or goggles are not subject to moisture fogging due to exhaled moisture. The external air is filtered by the dry zone filtering layer, so that the filtering efficiency of the dry zone filtering layer is higher, and the filtering efficiency of the wet zone filtering layer is not required. The area of the filtering layer in the dry area only accounts for 1/3 of the total area of the mask, so that a large amount of filtering materials with high protection grade can be saved, and particularly a large amount of electrostatic spray-melting non-woven fabrics can be saved; dry and wet areas are respectively realized in the mask, so that the aim of keeping the air inlet filter layer dry for a long time is fulfilled; the advantages are that on the premise of ensuring the filtering efficiency, the usage amount of 2/3 electrostatic melt-blown adhesive non-woven fabric can be reduced, and the service time of the mask can be prolonged; the mask with different protection grades can be upgraded or exchanged only by replacing the filter layer of the dry area. Not only the cost is reduced, but also the problem of shortage of raw materials can be relieved, different protection requirements are met, and one cover can be used for multiple purposes.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a usage state reference diagram according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of the frame of fig. 2.
Fig. 4 is a schematic structural view of the support frame in fig. 2, wherein B is a front view of the support frame, and C is a side view of the support frame.
Fig. 5 is a schematic view of the structure of the isolation layer in fig. 2, in which D is a perspective view of the isolation layer, E is a top view of the isolation layer, and F is a cross-sectional view of D.
FIG. 6 is a schematic view of the venturi passage of FIG. 5.
Fig. 7 is a schematic structural view of the filter layer in fig. 2, wherein G is a schematic structural view of the dry region filter layer, and H is a schematic structural view of the wet region filter layer.
Fig. 8 is a schematic structural diagram of another embodiment of the present invention.
Fig. 9 is a schematic structural diagram of yet another embodiment of the present invention.
Detailed Description
Example 1
The structure of the embodiment is shown in fig. 1, and the one-way airway combined mask comprises a mask body and a hanging rope 5, wherein the mask body is composed of a frame 4 and a filter layer covering the frame; the frame 4 consists of an annular support frame 1 which can contain the mouth and nose of a person, a crescent-shaped isolation layer 2 which is fixed in the middle of the support frame 1 and extends outwards, and a sealing gasket 3 which is attached to the periphery of the support frame 1 and faces; the inner side of the isolation layer 2 can be transversely jointed with the mouth and the nose, and the outer side divides the filter layer into an upper filter layer 8 forming a dry area 6 and a lower filter layer 9 forming a wet area 7; the dry region 6 and the wet region 7 are communicated through a one-way passage of the isolation layer 2 below the nostrils.
As shown in fig. 2, after wearing the mask, the mask and the face constitute two closed spaces of dry and wet, respectively. The mask frame 4, the isolation layer 2 of the mask frame 4, the dry region filter layer and the face form a dry region 6, and clean and dry air and gas Q flow insideIntoThe flow direction is from the outside in. The mask frame 4, the isolation layer 2 of the mask frame 4, the wet area filter layer and the face forming area are the wet area 7. The gas Q exhaled from the human body flows in the wet areaGo outThe flow direction is from the inside to the outside. The dry area and the wet area are formed by dividing a one-way isolating layer of the mask frame. The isolating layer 2 is provided with a unidirectional Venturi channel 2-3. The opening and closing of the thin valve plate A arranged through the channel opening realize that the gas in the dry area flows to the wet area, and the gas in the wet area cannot enter the dry area.
As shown in fig. 3, the mask frame is composed of a support frame 1, a one-way isolation layer 2 and a silica gel sealing pad 3. The sealing pad 3 is made of a silicone sheet and is mainly in contact with the face. Not only can ensure the periphery of the mask to be tightly attached to the face (nose bridge, cheeks and lower jaw), but also can ensure the sealing effect of the mask, and can reduce the uncomfortable feeling of the face.
As shown in fig. 4B and C, the support frame 1 is composed of a support frame 1-1 matched with the face shape, slots 1-2 distributed along the circumferential direction of the support frame and used for fixing a mask filter layer, and battens 1-3 matched with the slots. The outer edges of the filter layers in the dry area and the wet area are respectively inserted into the slots of the support frame, the pressing strips are closed, and the pressing strips apply pressure to the filter layers, so that the filter layers are tightly bonded with the support frame.
As shown in D, E, F in fig. 5, the isolation layer is a one-way isolation layer, and is composed of a horizontal isolation surface 2-2, a framework 2-1 fixed on the periphery of the isolation surface, a one-way venturi channel 2-3 with a directional valve and located at the nasal cavity on the surface of the isolation surface, a silica gel pad 2-4 on the inner side (attached to one side of the human face) of the isolation surface, a filter layer slot 2-5 located on one side of the isolation surface, which is far away from the human face, and a pressing strip 2-6 matched with the slot. The slots, the pressing strips and the supporting frame are used for fixing the filtering layers of the dry area and the wet area together. The pressing bar can rotate up and down. Before the filter layer is inserted, the pressing strip is opened to adhere the filter layer to the outer side of the isolation layer framework, then the pressing strip is pressed down to apply pressure to the filter layer, so that the filter layer can be tightly adhered to the inner wall of the support frame, and the filter layer is fixed. The framework maintains the shape of the isolation layer; the slots and the battens are used for fixing the filtering layer in the dry-wet area; the isolation surface divides the space between the mask filter layer and the face into an upper dry area and a lower wet area; the air circulation between the dry area and the wet area can be realized only through the Venturi channel of the isolation layer; the outermost silica gel pad is used for ensuring that the isolating layer is tightly attached to the face to realize the sealing effect.
The unidirectional Venturi channel 2-3 is positioned right below the nasal cavity close to the inner side of the isolation surface, and the design aims to ensure that moisture exhaled by the nasal cavity directly enters a wet area and cannot stay in a dry area, so that the flowing direction of air in the mask is ensured to flow from the dry area to the wet area. As shown in fig. 6, a directional valve which can rotate up and down is arranged on one side of the channel close to the wet area, and the directional valve is a thin valve sheet a. In the venturi channel region, the other part of the isolation surface 2-2 of the isolation layer is a solid body, and the dry area and the wet area are separated. Clean and dry air flows in the dry area from outside to inside, and exhaled air flows in the human body in the wet area from inside to outside. The one-way isolation layer of the mask frame is divided into a dry area and a wet area, the opening and closing of the sheet valve arranged through the passage port of the isolation layer realize that the gas in the dry area flows to the wet area, and the gas in the wet area cannot enter the dry area. When the nasal cavity exhales, the airflow passes from top to bottom through the venturi passage. Since the inner diameter of the channel in the dry zone decreases with the direction of the gas flow, its flow rate increases and its pressure decreases according to the bernoulli equation (P1 > P2, and PDry matterP1 is more than P2), the valve plate A rotates downwards to open the channel. The gas stream enters the wet zone from the dry zone. When the nasal cavity inhales, i.e. the gas P in the wet areaWetWhen the air flows from the wet area to the dry area through the channel, the valve plate A is rotated upwards to close the channel by the same principle that the valve plate A is rotated upwards by P3 to P2, the air is prevented from flowing into the dry area from the wet area, and one-way air through-flow is realized. The framework maintains the shape of the isolation layer; the slots and the battens are used for fixing the filtering layer in the dry-wet area; the isolation layer divides the space between the mask filtering layer and the face into upper and lower parts,A wet area; the air circulation between the dry area and the wet area can be realized only through the Venturi channel of the isolation layer; the outermost silica gel pad is used for ensuring that the isolating layer is tightly attached to the face to realize the sealing effect.
As shown in figure 7, the upper filtering layer is a dry area filtering layer 8 which is composed of an outer layer 8-1 with waterproof function and an inner layer 8-2 with filtering function, the material of the inner layer 8-2 is determined according to the protection grade requirement, and the inner side of the outer edge of the dry area filtering layer is attached with a pressure-sensitive adhesive tape 10. The dry region filter layer 8 is a key component for filtering external harmful substances of the mask. Because the filter layer is not contacted with the face and does not need to absorb the vapor exhaled by the nasal cavity, the nasal cavity breathing mask is only composed of an outer waterproof layer and an inner filter layer. The filter material used in the filter layer is determined by the protection class. The mask can be replaced according to the change of protection requirements, and different filter layers are adopted to combine different types of protective masks. Medical meltblown nonwovens are used primarily in this area. The spray-melting non-woven fabric with the SMS and SMMMS structure can be flexibly replaced according to the protection grade requirement. The area of the area only occupies 1/3 of the whole area of the mask, so that a large amount of medical spray-melted non-woven fabrics can be saved. The inner side of the outer edge of the filter layer is attached with a pressure-sensitive adhesive tape, when in use, the isolating film on the surface of the filter layer is torn off, the filter layer is inserted into the slots of the support frame and the isolating layer, and the pressing strip is pressed, so that the filter layer, the support frame and the isolating layer are tightly combined into a whole.
The lower filtering layer is a wet area filtering layer 9 which is composed of an outer layer 9-1 with waterproof function and an inner layer 9-2 with moisture absorption function, and the inner side of the outer edge of the wet area filtering layer is attached with a pressure-sensitive adhesive tape 10. The gas filtered by the wet area filtering layer is mainly the moisture exhaled by the wearer. The gas flow direction in the area is from inside to outside, and the requirement on the filtering efficiency is not high, but the requirement on the moisture absorption efficiency is high. The moisture absorption layer is made of high moisture absorption fiber materials. The structure of the breathable fabric can be composed of an outer waterproof layer and an inner moisture absorption layer, and the breathable fabric has a good breathable effect. The area of the filtering layer occupies 2/3 of the whole mask and does not need to be changed according to the change of the protection requirement. The installation method of the filter layer in the wet area is the same as that in the dry area.
The combined mask is prepared by the following method, and comprises the following steps:
fixing the isolation layer on the support frame near the position between the mouth and the nose, and manufacturing a sealing gasket into a mask frame;
step two, preparing filter sheets of a dry area and a wet area which are in accordance with the size of the frame according to the size of the frame, wherein the inner side of the outer edge of each filter sheet is attached with a pressure-sensitive adhesive tape;
thirdly, selecting dry area filter sheets with different filtering efficiencies according to different protection requirements, inserting the outer edges of the filter sheets with pressure-sensitive adhesive into slots on the dry area mask frame and the isolation layer, pressing a pressing strip, and fixing the pressing strip on the dry area frame;
fixing the wet area filter sheet on the wet area mask frame and the isolation layer according to the installation method of the dry area filter sheet, and finishing the preparation of the mask body;
and fifthly, fixing hanging ropes at two sides of the mask body, adjusting the hanging ropes to enable the silica gel pads at the inner sides of the isolation layers to be tightly attached between the nose and the upper lip, enabling the silica gel pads at the periphery of the mask support frame to be tightly attached to the face, and forming an upper dry area and a lower wet area inside the mask.
In the method, the surface of the pressure-sensitive adhesive tape is attached with the isolating film, and when the pressure-sensitive adhesive tape is used, the isolating film is torn off, the pressure-sensitive adhesive tape is inserted into the slot and is pressed tightly by the pressing strip.
The following five points need to be noted:
1. the frame of the mask is divided into large, medium and small sizes according to different people. And preparing dry and wet area filter plates with corresponding sizes according to the sizes of the frames. The wet area filter disc does not need to be replaced along with the requirement of the protection grade, and the filter disc can be standardized and generalized and prepared for storage and standby. The dry area filter is a key component for protecting the mask, the dry area filter with different filtering efficiencies is prepared, and the flexible replacement of the dry area filter to adapt to different protection grade requirements is one of the characteristics of the invention. The inner layer filter layer material of the dry region filter sheet can adopt different layers of electrostatic spray-melt non-woven fabrics according to the filtering requirement.
2. And selecting dry area filter sheets with different filtering efficiencies according to different protection requirements. Tearing off an isolation film on the surface of a pressure-sensitive adhesive tape on the inner side of the filter sheet, inserting the outer edge of the filter sheet with the pressure-sensitive adhesive into slots of the inlet cover frame 1-2 and the isolation layer 2-5, pressing a pressing strip, and fixing the pressing strip on the dry area frame;
3. the filter material for the wet zone is generally unchanged. Fixing the general wet area filter sheet on the wet area frame and the isolation layer according to the method;
4. after the mask is assembled, a hanging rope of the mask is adjusted, so that 2-4 silica gel pads on the inner sides of the isolation layers are tightly attached between the nose and the upper lip, the silica gel pads on the outer sides of the mask support frame are tightly attached to the face, and an upper area and a lower area (a dry area and a wet area) are formed in the mask;
5. with the mask, breathing through nasal cavity is possible.
The filtering layer of the dry area can be flexibly replaced according to the requirement. The mask protection grade can be changed by only replacing the filter layer of the dry area, and the mask is suitable for the requirements of various environments. The change of the different protection level masks is as follows:
1. carrying dry zone filters of the same size and different protection levels. It can be common dust-proof type, anti-haze type, anti-droplet, blood type (surgery), N95 type respectively. The wet area filtering layer is a universal wet area filtering layer.
2. Outside the hospital, dry district uses dustproof or antifog haze filter layer, and wet district uses general wet district cassette. After the medical liquid is added into a hospital, the dry area filter disc is replaced by an anti-droplet type, and daily medical work can be performed. When the infected zone was added, the dry zone filter was changed to type N95. If the wet area filter sheet is also changed into the N95 type, the protection grade is further improved.
3. When the mask leaves the protection area, the mask frame can be reused only by disinfecting and replacing a new filter disc.
Example 2
As shown in FIG. 8, the structure of this embodiment is substantially the same as that of embodiment 1, except that the structure of the channel is that an elastic valve sheet A capable of opening downwards is arranged in the one-way channel. When exhaling, the elastic valve plate can only be opened downwards, the air in the dry area is brought into the wet area by means of the exhaling airflow, and the elastic valve plate is reset when inhaling, so that the air in the wet area is prevented from flowing into the dry area. The one-way channel is a Venturi channel provided with an elastic valve plate A capable of being opened downwards, the Venturi channel is provided with a downward expansion port and an adsorption port 13 positioned at the small diameter of the upper end, and the adsorption port13 are in communication with the dry zone above the barrier layer through side suction pipes 12. The pressure generated during expiration, due to the Venturi effect, will generate a negative pressure P at the outlet of the side suction pipe 120Sucking dry zone air (P)4＞P0) Therefore, fresh air is supplemented into the dry area during expiration, and the dry area air during inspiration is cleaner.
Example 3
As shown in fig. 9, the structure of the present embodiment is substantially the same as that of embodiment 1, except that it can be connected to an external purified air (with positive pressure) pipe to form a positive pressure protective mask.
The dry area filter layer 8 is made of air-proof material, and an air inlet 11 is arranged on the filter layer and is connected with a peristaltic pump of the portable air filter. The air filtered by the air filter enters the dry area 6 with a certain pressure and enters the wet area 7 from the dry area 6 through the isolation layer 2; the filter sheet of the wet area 7 is a common wet area filter sheet. The mask is always kept with positive pressure higher than the outside, and meanwhile, the breathing is not influenced. Since the internal pressure is higher than the external pressure, the harmful substances outside cannot enter the mask, which has the highest protection grade but uses the simplest and most convenient materials.
In addition to the above, other embodiments of the present invention are possible. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (10)
1. A one-way air passage combined mask comprises a mask body and a hanging rope, wherein the mask body is composed of a frame and a filter layer covering the frame; the frame consists of an annular support frame capable of containing the mouth and the nose of a person, a crescent-shaped isolation layer fixed in the middle of the support frame and extending outwards, and a sealing gasket for attaching the periphery of the support frame to the face of the person; the inner side of the isolation layer can be transversely attached to the mouth and the nose, and the outer side divides the filter layer into an upper filter layer forming a dry area and a lower filter layer forming a wet area; the dry area and the wet area are communicated through a one-way channel of an isolation layer below the nostrils.
2. The one-way airway modular mask of claim 1, wherein: the isolating layer is a one-way isolating layer and consists of a horizontal isolating surface, a framework fixed on the periphery of the isolating surface, a channel with a directional valve and positioned at the nasal cavity on the surface of the isolating surface, a silica gel pad positioned on one side of the isolating surface, which is attached to the human face, a filtering layer slot positioned on one side of the isolating surface, which is deviated from the human face, and a pressing strip matched with the slot.
3. The one-way airway modular mask of claim 2, wherein: and one side of the channel, which is close to the wet area, is provided with a directional valve which can rotate up and down and is a thin valve plate.
4. The one-way airway modular mask of claim 2, wherein: the channel is provided with an elastic valve plate which can be opened downwards.
5. The one-way airway modular mask of claim 4 wherein: the passageway is equipped with the one-way venturi channel that can open the elastic valve piece down, the venturi channel has expansion mouth and the absorption mouth that is located upper end path department down, the absorption mouth is through the dry district intercommunication of side straw and isolation layer top.
6. The one-way airway modular mask of claim 1, wherein: the support frame is followed by the supporting framework of cooperation face shape supporting framework circumference distributes be used for fixing the slot of filter layer and with slot complex layering constitutes.
7. The one-way airway modular mask of claim 1, wherein: the upper filtering layer is a dry area filtering layer and consists of an outer layer with a waterproof function and an inner layer with a filtering function, the material of the inner layer is determined according to the protection grade requirement, and a pressure-sensitive adhesive tape is attached to the inner side of the outer edge of the dry area filtering layer.
8. The one-way airway modular mask of claim 1, wherein: the lower filtering layer is a wet area filtering layer and consists of an outer layer with a waterproof function and an inner layer with a moisture absorption function, and a pressure-sensitive adhesive tape is attached to the inner side of the outer edge of the wet area filtering layer.
9. The method for manufacturing a one-way airway modular mask as claimed in claim 1, comprising the steps of:
fixing the isolation layer on the support frame near the position between the mouth and the nose, and manufacturing a sealing gasket into a mask frame;
preparing filter sheets of a dry area and a wet area according with the size of the frame according to the size of the frame, wherein the inner side of the outer edge of each filter sheet is attached with a pressure-sensitive adhesive tape, and the surface of each pressure-sensitive adhesive tape is attached with an isolating membrane;
thirdly, selecting dry area filter sheets with different filtering efficiencies according to different protection requirements, inserting the outer edges of the filter sheets with pressure-sensitive adhesive into slots on the dry area mask frame and the isolation layer, pressing a pressing strip, and fixing the pressing strip on the dry area frame;
fixing the wet area filter sheet on the wet area mask frame and the isolation layer according to the installation method of the dry area filter sheet, and finishing the preparation of the mask body;
and fifthly, fixing hanging ropes at two sides of the mask body, adjusting the hanging ropes to enable the silica gel pads at the inner sides of the isolation layers to be tightly attached between the nose and the upper lip, enabling the silica gel pads at the periphery of the mask support frame to be tightly attached to the face, and forming an upper dry area and a lower wet area inside the mask.
10. The method of making a one-way airway modular mask as defined in claim 9 wherein: the inner layer material of the dry region filter sheet adopts corresponding layers of electrostatic spray-melt non-woven fabrics or adopts air-impermeable materials according to the filtering requirements, and an air inlet used for connecting a portable air filter with pressure is arranged on the air-impermeable materials.
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| CN202010262219.4A CN111449319A (en) | 2020-04-06 | 2020-04-06 | One-way air passage combined mask and preparation method thereof |
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| CN202010262219.4A CN111449319A (en) | 2020-04-06 | 2020-04-06 | One-way air passage combined mask and preparation method thereof |
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| CN111887522A (en) * | 2020-09-07 | 2020-11-06 | 孙承业 | Concatenation gauze mask |
| CN112043022A (en) * | 2020-09-07 | 2020-12-08 | 孙承业 | Layered mask |
| CN112716072A (en) * | 2020-12-17 | 2021-04-30 | 绍兴标点纺织科技股份有限公司 | Medical mask for resisting coronavirus |
| CN112843627A (en) * | 2021-01-19 | 2021-05-28 | 邢玉琴 | A pulmonary function rehabilitation training ware for breathing internal medicine |
| WO2022074410A1 (en) * | 2020-06-22 | 2022-04-14 | Sziracsik Zoltan | Face mask for covering a user's face |
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