210results about How to "Increase the effective filter area" patented technology

The present invention provides for the transplantation of tissue from a donor site in a body to a recipient site. The device includes an outer chamber having an interior volume in which a perforated inner chamber can be placed. During the aspiration of tissue, a vacuum is formed in the interior volume of the outer chamber, to draw tissue from a cannula into the perforated inner chamber. The perforations are sized such that fat is collected within the inner chamber, while fluids and other materials are drawn through the perforations, away from the collected fat. For reinjection, the inner chamber can be removed from the outer chamber, and a sleeve positioned to cover the perforations and thereby form a syringe body that can be interconnected to a needle and plunger for reinjection of the collected fat.

An object of the present invention is to provide a honeycomb structural body which is low in pressure loss and can prolong a period up to a regenerating process. The present invention is directed to a columnar honeycomb structural body comprising a large number of through holes placed in parallel with one another in a length direction with wall portion interposed therebetween, wherein: each of the through holes has one of ends sealed; one end face of the through hole differs in opening area from the other end face thereof; a ceramic material which constitutes the wall portion has an average pore diameter in a range from 5 to 30 μm; and the rate of capacity of micro pores each having a pore diameter two or more times larger than the average pore diameter is set to 30% or less of the capacity of the entire micro pores.

The present invention provides for the transplantation of tissue from a donor site in a body to a recipient site. The device includes an outer chamber having an interior volume in which a perforated inner chamber can be placed. During the aspiration of tissue, a vacuum is formed in the interior volume of the outer chamber, to draw tissue from a cannula into the perforated inner chamber. The perforations are sized such that fat is collected within the inner chamber, while fluids and other materials are drawn through the perforations, away from the collected fat. For reinjection, the inner chamber can be removed from the outer chamber, and a sleeve positioned to cover the perforations and thereby form a syringe body that can be interconnected to a needle and plunger for reinjection of the collected fat.

An object of the present invention is to provide a honeycomb structural body which is low in pressure loss and can prolong a period up to a regenerating process. The present invention is directed to a columnar honeycomb structural body comprising a large number of through holes placed in parallel with one another in a length direction with wall portion interposed therebetween, wherein: each of the through holes has one of ends sealed; one end face of the through hole differs in opening area from the other end face thereof; a ceramic material which constitutes the wall portion has an average pore diameter in a range from 5 to 30 μm; and the rate of capacity of micro pores each having a pore diameter two or more times larger than the average pore diameter is set to 30% or less of the capacity of the entire micro pores.

The present invention relates to a filter device for filtering a fluid, in particular an oil filter. It has at least one filtering medium and a bypass for the filtering medium. Furthermore, an actuator is provided, which influences the flow of the fluid through the bypass as a function of a predetermined parameter of the fluid. The actuator is preferably controlled as a function of the viscosity of the fluid, a differential pressure of the fluid at the filtering medium, and / or the temperature of the fluid.

The invention discloses a spraying rotating brush dust collecting device. The entire dust collecting device is a tower body of which the lower part is provided with a flue gas inlet and the top is provided with a flue gas outlet; a demister is arranged in front of the top flue gas outlet of the tower; the middle part of the tower is provided with a spraying layer and a hair brush filtering layer; the bottom of the tower is provided with a mortar pond; the spraying layer is positioned above the hair brush filtering layer; the hair brush filtering layer consists of a plurality of rotating brush layers, a plurality of fixed brush layers, a transmission mechanism, a speed reducer and a driving motor; each rotating brush layer and each fixed brush layer consist of one group of hair brushes; the hair brushes are fixed on corresponding hair brush shafts; and each hair brush shaft of the rotating brush layer is in transmission connection with the driving motor through the transmission mechanism and the speed reducer. The spraying rotating brush dust collecting device has the characteristics of high suitability and high dust collecting efficiency, and is particularly suitable for purifying high-temperature and corrosive gases.

The invention discloses a multi-filter cylinder automatic backwashing filter apparatus. A housing is divided into an upper chamber and a lower chamber by a separation plate. The separation plate is provided with filter cylinders in the manner of one, two, or multiple concentric circles. The sidewall of the housing under the separation plate is provided with a sewage inlet, and the sidewall of the housing above the separation plate is provided with a pure water outlet. A motor of a backwashing mechanism drives a main shaft to rotate. A lifting mechanism drives the main shaft to go up and down. A multi-way connection seat connects the main shaft, rotating arms and a waste pipe together. The main shaft drives the rotating arms to lift and rotate. The waste pipe is fixed. Suction nozzles fixed on the upper end port of the rotating arms can be in sealed connection with water inlets on the separation plate. The end part of the waste pipe is connected with an electric drain valve or a pneumatic drain valve. A control system controls the actions of the motor, the lifting mechanism and the electric drain valve or the pneumatic drain valve. The filter apparatus has the advantages of small size, large amount of water filtration, high production efficiency, good filtration effect of filtered water, good backwashing effect, low frequency of backwashing, long-life apparatus, low maintenance rate, and saving backwash water.

The invention relates to a novel flat-sheet membrane module, which comprises filtering membranes and a support diaphragm plate for fixing the filtering membranes, wherein the support diaphragm plate is clasped with two front and back mesh plates through a frame; the front lateral surface and the back lateral surface of the support diaphragm plate are uniformly provided with densely distributed filter meshes; the two lateral surfaces are fixed with the filtering membranes in a mode of sticking or welding; membrane holes on the filtering membranes are communicated with a hollow inner cavity through the meshes on the support diaphragm plate; and a stream guiding area is arranged in the hollow inner cavity, and one end of the support diaphragm plate is provided with an effluent nozzle communicated with the stream guiding area. When the flat-sheet membrane module is applied, under the action of the negative pressure of a self-priming pump or the positive pressure of a filter hybrid hydraulic head, liquid infiltrates the surfaces of the filtering membranes, runs through the meshes of the support diaphragm plate to enter the hollow inner cavity, and then flows into an effluent trench through the stream guiding area and outflows from the outflow nozzle to realize the integral filtering process. The membrane module has the characteristics of easy machining, high utilization factor of the membrane, uniform distribution of pressure in the cavity and the like, is easy to be assembled into membrane assemblies in various forms, and is applicable in the fields of industrial filter and water treatment.

The invention discloses a cylindrical backwash purifying device comprising a body and a plunger which is arranged in the body and can be connected in an axially sliding manner. The body is provided with a feeding passage and a discharge passage which are connected with a through hole. An outer circle at the front part of the plunger is recessed inwards, and together with the inner wall of the through hole, forms an annular empty cavity which is connected with the feeding passage. The plunger is axially provided with an L-shaped hole, which is connected with the discharge passage, in a direction from the front to the back. A recessed peripheral surface of the plunger is radially provided with a filter hole connected with the annular empty cavity and the L-shaped hole. The recessed peripheral surface of the plunger is connected with a detachable filter screen. A separating bar contacted with the inner wall of the through hole is axially arranged on the plunger and in the annular empty cavity. Semicircular grooves are arranged on the outer surface of the plunger and at two sides of the discharge passage. The cylindrical backwash purifying device has the advantages of reasonable design, simple structure, small volume, large effective filter area, good filter effect, no need of halt during cleaning or filter screen replacement, long continuous work time, high work efficiency and high product quality.

The invention provides a breathing training device. The breathing training device comprises an inspiration training assembly, an expiration training assembly, a gas drainage assembly and a breathing terminal, wherein an inspiration floating part and an expiration floating part are respectively provided with an inspiration ventilation pipe and an expiration ventilation pipe which run through the inspiration floating part and the expiration floating part; an inspiration indicating float and an expiration indicating float are also arranged inside the inspiration ventilation pipe and the expiration ventilation pipe. The breathing training device not only enables inspiration training and expiration training to be synchronously carried out in the healthy breathing environment and improves vital capacity, but also has a function of indicating the recovery condition of the vital capacity.

The present invention relates to a press pan filter which includes a hollow shaft, a filtering apparatus fixed on the hollow shaft, a scraper apparatus for discharging and a tank, it is characterized in that: the filtering apparatus is at least a circular filter plate arranged along the axial direction of the hollow shaft, the circular filter plate is composed of at least twelve sector cavities disposed along the circular surface; the tank is a sealing pressure tank composed of a drum and two seal heads; a hollow cylinder concentric with the hollow shaft is arranged in the hollow shaft, an annular cavity is composed of the inner wall of the hollow shaft and the outer wall of the cylinder, longitudinal paths corresponding to the cavity on the filter plate and independent to each other are arranged between the inner wall of the annular cavity and the outer wall of the annular cavity, and each longitudinal path communicates with the corresponding cavity on the filter plate. The machine is also equipped with a swinging spray device. All of the motions of the machine are electrically controlled with high degree of automation. The invention is suitable for the pre-suspension technology, and has advantages of compact structure, big filter area and high yield capacity.

The invention discloses a system and a method for processing rubbish percolate. The system comprises a collecting pool, a middle pool, a vibrating film nano-filtration device and an evaporation device, wherein the vibrating film nano-filtration device comprises a shell, a diaphragm set and a motor; the diaphragm set downward extends, thereby forming a central driving rod; the motor and a belt areused together for driving an eccentric block on the central driving rod to rotate so as to generate a centrifugal force which can trigger vibration; the diaphragm set is driven to vibrate by energy generated from vibration, with the help of the central driving rod; and a shearing force which is generated by high-frequency vibration is spread in a sine form by the surface of a diaphragm in the diaphragm set, thereby efficiently solving a chocking problem of the diaphragm in the diaphragm set, achieving higher capability of resisting diaphragm pollution, realizing simple and efficient treatmentfor the rubbish percolate and achieving a better treating effect. A recycling system which is composed of the collecting pool, the middle pool and the evaporation device is used for continuously and efficiently separating clean liquid from concentrated liquid. The clean liquid meets the standard and is discharged. The concentrated liquid is evaporated and treated by the evaporation device, thereby achieving the purposes of reducing emission and reducing wastes.

The invention discloses a rotary filter for purifying a fusant of a plastic extrusion system. The rotary filter comprises a feeding end machine body and a discharging end machine body; a filter net disc is arranged between the feeding end machine body and the discharging end machine body through a connecting and fastening element; the filter net disc generates rotary motion through the matched action of a detent type transmission device; the filter net disc is provided with a plurality of filtering passages formed by a plurality of filter net holes; the filter net disc is tightly covered by the feeding end machine body and the discharging end machine body; the feeding end machine body is provided with a net exchanging chamber; the outside of the net exchanging chamber is provided with a door body which can open or lock the net exchanging chamber; by opening or locking the net exchanging chamber by the door body, the rotary filter conveniently and safely completes the exchange of a new net sheet and an old net sheet of the filter net holes under the condition of ensuring almost unchanged pressure in high-pressure production.

A strainer filtering apparatus including a filtering tube providing a substantially larger effective filtering area for its length and width, substantially reducing foreign substances covering a suction surface and flow resistance of the foreign substances, and reducing pressure drop at a cooling water passage. The strainer filtering apparatus includes at least one inlet side into which cooling water is introduced and an outlet side through which the cooling water is discharged, hollow filtering tubes with filtering holes along their lengths, an upper plate having first grooves located at a lower surface and coupled to upper ends of the filtering tubes and an inlet part into which the cooling water is introduced, and a lower plate having punched holes to which lower ends of the filtering tubes are coupled. The cooling water in the filtering tubes is introduced through the punched holes and discharged at the outlet side.

The invention relates to a cloth media filter system which comprises a filter device, a filtrating device and a backwashing device. The filter device comprises a sewage treatment area, a filtered water area and a water drainage area. The filtrating device comprises a plurality of filtrating units regularly arrayed, and each filtering unit comprises a filtering frame, filtering cloth and a filtering cloth support, wherein the filtering frame is a hollow latticed frame, the filtering cloth support is a W-shaped corrugated filtering screen, and the filtering cloth 220 is compactly laid on the filtering screen. The backwashing device comprises a driving power device and a backwashing negative pressure pipeline, the driving power device comprises a driving platform, a driving guide rail and a driving motor, and the backwashing negative pressure pipeline comprises a dredge pump, a sludge conveying pipe, a cleaning header pipe, a cleaning connecting pipe and a W-shaped corrugated sludge suction pipe. A sewage treatment method of the cloth media filter system comprises the steps of filtering, air washing, backwashing water washing and the like. According to the cloth media filter system and the sewage treatment method of the cloth media filter system, the effective filtration area of the filtering device is increased through a corrugated filtering surface and the backwashing component, the working efficiency is high, the water yield is large and water output quality is good.

The invention relates to a stage blowback dust-cleaning method of an air box blowback bag type dust collector, and the air box blowback bag type dust collector, and the method includes the following steps: (1) closing an air exhaust valve of a dust collection bag chamber of the collector, and opening a reverse blow valve; (2) setting the initial wind speed of a back blower to 0.3-2 times as high as the filtering wind speed to blow back the dust collection bag in the dust collection chamber, with blowback time being 0.5-5 s; (3) increasing air quantity of the back blower to 1-5 times as large as the filtering wind speed; (4) continuing to blow back the dust collection bag, with blowback time being 2-60 s, and finishing the dust collection. The stage blowback dust-cleaning method in the invention can enhance blowback dust-cleaning effect of air box blowback bag type dust collector, ensure external surface of the dust collection bag to be thoroughly cleaned, avoid dust deposition phenomenon at bottom of the dust collection bag, and improve dust collection efficiency. In addition, the dust collector used in the stage blowback dust-cleaning method is characterized by simple structure, reasonable design, convenient use, and energy saving.

The invention discloses an automatized and integrated MBR (membrane bioreactor) automatic treatment system for ship sewage, and the system provided by the invention is characterized in that lye and / or black water in a ship are / is filtered by virtue of a quick open type coarse grid tank and then introduced to a sewage adjusting tank, the sewage and less solid substances entering the sewage adjusting tank are pulverized and circulated by virtue of a pulverizing and adjusting pump arranged at the bottom of the sewage adjusting tank and are further filtered by virtue of a quick open type fine grid tank, and the further filtered sewage is elevated to an MBR reaction tank by virtue of the pulverizing and adjusting pump through a water outflow branch pipe; the treated sewage is subjected to biochemical treatment in the MBR reaction tank and then enters into a clean water collecting tube through an MBR membrane, the clean water is disinfected by an ultraviolet disinfector, and the disinfected clean water can be directly introduced to a clean water tank or discharged. The system provided by the invention has the advantages of compact structure, small occupation area, unattended operation, automatic running, simplicity and convenience for maintenance, stable running and suitability for the requirements in ship navigation.

The invention relates to a filter cloth-filter chamber filtering device which comprises a filtering device body and a back washing device, wherein the filtering device body comprises filter frames, filter cloth and filter cloth brackets; a plurality of regularly distributed draining through holes are formed in walls of vertically and horizontally communicated branch tubes at the inner parts of filter frames; filtered water outlets are formed in the bottom of the filter frames; the filter cloth brackets are W-shaped corrugate filter screens; the filter cloth is tightly laid on the W-shaped corrugate filter screens, closed filtered water space is formed by the filter frames, the filter cloth and the filter cloth brackets; the back washing device comprises W-shaped corrugate mud suction tubes, cleaning connecting tubes, a cleaning main pipe and a negative pressure suction discharge pipe; mud suction seams are formed in the back washing ends of the W-shaped corrugate mud suction tubes, the mud suction seams are closely matched with the filter cloth laid on the W-shaped corrugate filter screens. A method for disposing sewage, provided by the invention, comprises the steps of filtering, positive pressure air impacting, negative pressure pumping and the like. Through the adoption of the corrugate filter surfaces and the back washing component, the effective filtering area of the filtering device is increased, the work efficiency is high, and the water output is high.

The air filtering net installing structure for indoor unit of air conditioner includes front panel with opening for sucking air on one side and elastic hanging part; air filtering net with frame in the shape corresponding to that of the opening and filtering net to filter air flowing through the opening; and elastic handle formed on the air filtering net in the position corresponding to the elastic hanging part for being hung onto the elastic hanging part. The air filtering net installing structure is easy to assemble and disassemble and may be made via embedded injection process. The air filtering net may be bent along the support ribs to increase filtering area and raise filtering efficiency.

The invention discloses a recycling system and method of electroplating pretreatment sewage. The system comprises an electroplating pretreatment device, a collecting pool, a vibration membrane ultrafiltration device and a moderate pool, wherein the vibration membrane ultrafiltration device comprises a casing and a membrane unit and a motor which are installed in the casing; and the membrane unit is provided with a center transmission rod which downwardly stretches, thus an eccentric block on the center transmission rod is driven by the motor through a belt to rotate, so that a generated centrifugal force can trigger swing, and energy generated by swing promotes the membrane unit to vibrate through the center transmission rod, thus the silting problem of a membrane in the membrane unit is effectively solved, the capacity of resisting membrane pollution is stronger, sewage is simply and effectively treated, and treatment effect is better; the electroplating pretreatment device, the collecting pool and the moderate pool are coordinated and utilized to constitute a sewage recycling system so as to persistently and effectively separate out a clear liquid and a concentrated liquid; and the clear liquid is input into the moderate pool, subjected to oil removal and then recycled to the electroplating pretreatment device, thereby reducing water use amount and oil-removing powder use amount and achieving the purpose of reducing emission and reducing wastes.

The invention discloses an over-frequency vibrating separator and a separating system. The over-frequency vibrating separator comprises a casing, a membrane set and a motor. A central driving rod is extended from the membrane set and is equipped with an eccentric block and first flange at a lower end thereof; an output terminal of the motor is provided with a second flange which is flexibly connected with the first flange through a belt. Thereby, the motor drives the eccentric block on the central driving rod to conduct eccentric exercise in order to initiate swing, and energy generated from swing promotes vibration of the membrane set through the central driving rod; when a rotating speed of the motor reaches a frequency required by a resonance environment, the vibrating amplitude of themembrane set reaches the maximum, and the shearing force generated by the membrane set transmits in a sine mode through diaphragm surfaces in the membrane set, so as to effectively solve a problem ofdiaphragm stagnation in the membrane set. The over-frequency vibrating separator, a charge pump, a charging cylinder and a filtering hydraulic cylinder form a separating system in order to separate afiltrate continuously and effectively and realize a higher sewage recovery utilization rate; meanwhile, a lot of energy can be saved to bring good economic and social benefits for an enterprise.

The invention relates to a self anti-deformation flushable air cleaner, which comprises a cylindrical shell, a pleated filter core, a mainstream wind inlet, a mainstream wind outlet and a purified wind outlet. The pleated filter core is provided in the cylindrical shell, two ends of the pleated filter core are fixedly connected with the cylindrical shell, the purified wind outlet is communicated with the pleated filter core. The invention is characterized in that the pleated filter core is composed of a group of filter discs by staking up, the adjacent filter discs are connected by an interlace mode according to an inner edge connection, an outer edge connection and the inner edge connection, an outer ring formed by the out edge connection is provided with a circular rigid outer ring; or the outer ring is provided with a circular rigid outer ring, an inner ring formed by the inner edge connection is provided with a rigid inner ring. The anti-deformation performance is realized by completely depending on the filter material itself and the rigid outer ring, so that the self anti-deformation flushable air cleaner is capable of simplifying the structure, reducing the processing difficulty, raising the self-cleaning effect and prolonging the usage life of the filter core.

An improved air cleaner assembly for large displacement stationary engines provides for an included environmentally friendly disposable filter element containing substantially no chlorine compounds or structural metal supports which upon incineration or landfilling become undesireable chemical compounds. Improved sealing results by creating novel gasket compression control both radially and by a face seal by use of permanent metal components which are not discarded as before. Excessive compression of the gasket material is prevented by structure integral to the air cleaner assembly, and support of the filter element is external within the air cleaner assembly rather than internal within the filter element, thus eliminating the manufacturing cost of metal components previously discarded as integral to the filter element upon replacement of the disposable filter element.

The present invention is a filter assembly for vacuum filtration formed of a housing having an upper portion and lower portion, a filter separating the upper from the lower portion of the housing, an inlet formed in the upper housing, an outlet and a vacuum port formed in the lower portion, a gasket arranged at a lowermost surface of the lower portion and the upper portion is having a height sufficient to trap any air that might enter and keep it away from the membrane surface. Preferably, it is of a curved shape, preferably in the form of a dome. Optionally, the upper portion of the housing may also contain a vent, particularly a vent controlled by a valve, for the removal of air periodically from the upper portion, especially when a large incursion of air has occurred.

A folded filter element structure, a filter cartridge device and a processing method thereof, the folded filter element structure includes a filter element frame, the filter element frame is connected with a ring-shaped folded filter element, the lower end of the filter element frame is provided with a lower cover; the filter cartridge device includes a filter cartridge and a The pleated filter element structure; during processing, one or more materials in the nuclear pore fine filter membrane, non-woven fabric, and nuclear pore coarse filter membrane are compositely welded together, and folded or not folded in half along the width direction and placed in parallel, and then along the The stretching direction is folded into a louver shape, and its two ends are sealed and welded to form a ring-shaped folded filter element; the folded filter element is placed on the filter element frame, and then the upper and lower edges of the folded filter element are welded to the upper and lower covers to form a sealed body; put the sealed body Insert it into the frame of the filter cartridge so that the upper and lower covers fit closely with the inner wall of the frame of the filter cartridge. The filter element of the present invention is self-contained, easy to replace, low in production cost, long in service life, has increased effective filtering area of ​​the filter element, strong dirt holding capacity, improved filtering efficiency, reduced replacement frequency, more convenient use and wide application range.

The invention relates to a self-cleaning pulse air strainer with the partition board box-type filter element, the net locates outsides, and the frame sited all around, in the frame there is a draught excluder strip, some partition boards locate in the center of the filter element, and the filter paper is between the partition boards. The partition board is made by the aluminum handkerchief with a tile-edge form, the contour of it has a square shape module type, which can intercept the dust granule effectively, and not form the oversized resistance to the air current, and the filter fineness can achieve 0.3mum. The partition board box-type filter element with 80% textile fibers, 20% polyester synthesis filter paper has a belt partition board's box-type filter element which the filter fineness progressive raises, this partition board uses the aluminum handkerchief to make the corrugated shape, which enhances filter paper's effective filtration area, reduces the low resistivity rate, and increases accommodates the quantity of dust, it solves the problem of losing the filter efficiency because of the combination of the filter paper along with the increasing pressure. The textile fiber polyester composition material can filter effectively the tiny dust pellet and let it on the material surface, which strengthens the effect of clearing ash by pulse, and lengthens the filter element's life.

The invention provides a dustproof mouth mask with a dynamic breathing function for a dust work environment. A filter material of the dustproof mouth mask adopts corrugated filter sponge, the adopted corrugated angle theta of the filter material is less than 60 DEG, a corrugated generating line is parallel to the gravity direction, and an air outlet and the downstream part of the filter material at an air inlet of the mouth mask are provided with a high-speed centrifugal fan respectively. On the premise of meeting the air flow for breathing of a human body, the effective filter area of the filter material is increased, the air speed is reduced, the flow resistance of the filter material is reduced, and the inhalation resistance is reduced. A micro electric air supplying and exhausting system and the micro high-speed centrifugal fan are adopted; and the requirement of the pressure in the inhaling process of the human body can be fully met, and the increment of the pressure in the inhaling process of the human body is controlled to be in the reasonable range at the same time. The breathing pressure difference of the novel mouth mask is controlled to be within 30 Pa, the structure design and the control of the whole system are simplified while the safety is met and the comfort is improved, and the mouth mask is small in volume, light in weight and convenient to carry.

The invention discloses a high-efficiency filter press. The high-efficiency filter press comprises a rack, beams are horizontally arranged on the rack, a thrust plate is fixedly arranged at one end of each beam, and a moving plate is arranged at the other end of each beam. The moving plate is driven by a main oil cylinder and can be movably arranged on the beams, multiple filtering plates are hung at the positions, between the thrust plate and the moving plate, of the beams in a horizontal movement mode, and provided with sludge inlets, feeding positioning oil cylinders are arranged between the adjacent filtering plates, filtering cavities are formed, filtering cloth is arranged inside the filtering cavities, and a plate pulling mechanism used for separating the filtering plates is arranged on the beams. The high-efficiency filter press has the advantages of being large in compression ratio and effective filtration area and high in squeezing pressure and working efficiency, the amount of accessory equipment is small, and the service life of the filtering plates is long.

The invention discloses a three-dimensional flaky folding low-pressure mask, which comprises a face mask formed by at least one layer of filtering sheet. A folding part is arranged on the face mask. The three-dimensional flaky folding low-pressure mask is characterized in that the folding part is provided with a linear folding mark, fold line folding marks and drape folding marks; the face mask is forwards folded along the linear folding mark and is then reversely folded back along the fold line folding marks; the fold line folding marks are formed by two line segments through end-to-end connection; the drape folding marks are formed by distributing fold line folding marks on the reversely folded face mask through starting from the vertexes; the number of the drape folding marks starting from the vertex of each fold line folding mark is more than two; the drapes are flattened through the folding along the drape folding marks; each folded layer is in a flat flake folding state; after the folding, the periphery edge of the face mask is bonded; in the use process, the folding parts are unfolded, an outwards projected space can be formed at the vertex of the fold line folding marks; the form is stable; the airflow is smooth; the filtering efficiency of each position of the filtering sheet can be achieved in a balanced way; and the integral filtering effect is improved.