211results about How to "Increase dust holding capacity" patented technology

Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.

The invention provides a modified polypropylene master batch, melt-blow cloth, a preparation method and an application thereof. The modified polypropylene master batch is mainly produced from, by weight, 77-90% of polypropylene, 5-20% of a graphene material and 1-5% of an additive. The graphene material includes any one or more of graphene, graphene oxide and graphene derivative. The additive includes any one or more of a coupling agent, a dispersant and an antioxidant and preferably includes the coupling agent, the dispersant and the antioxidant. The modified polypropylene master batch, when being used for manufacturing the melt-blow cloth, not only improves antibacterial and electrification property but also increases the filtering efficiency and dust capacity of the melt-blow cloth.

Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.

Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.

The invention relates to a compound air filter material and a method for preparing the same. The composite air filter material used for filter bags comprises a protective layer, a deodorizing layer and a filter layer, wherein the protective layer and the filter layer are compounded on two side faces of the deodorizing layer respectively; the protective layer is made of wood pulp fiber filter paper, spun-bond non-woven fabric or spun-lace non-woven fabric, and the gram weight of the material of the protective layer is 10 to 200g/m; the deodorizing layer is made of one of active carbon, zeolite , sodium bicarbonate, magnesium aluminum silicates and silica gel or a mixture of any two of the wood pulp fiber filter paper, the spun-bond non-woven fabric and the spun-lace non-woven fabric, and the gram weight of the material of the deodorizing layer is 10 to 300g/m; and the filter layer is made of melt-blown non-woven fabric, wood pulp fiber filter paper or SMS non-woven fabric, and the gram weight of the material of the filter layer is 10 to 100g/m. The compound air filter material has high filtration efficiency and deodorization efficiency, low filtration resistance and high dust capacity.

The invention discloses needling static filter cotton. The needling static filter cotton comprises a needling non-woven layer, wherein any surface or two surfaces of the upper surface and the lower surface of the needling non-woven layer is or are provided with a spunbonded nonwoven fabric layer. A preparation method of the needling static filter cotton comprises the following steps of producing a needling cotton, drying, compositing the needling cotton, applying static electricity and packaging a finished product. The needling static filter cotton provided by the invention has the advantages that the needling cotton is composited, the wind pressure resistance of the needling cotton is enhanced, so that the needling cotton plays the supporting role, the high-density electrostatic charge is applied on the needling cotton, so that not only is the filter efficiency greatly improved to enable the filtration efficiency to be more than 98%, and also the filtration resistance is greatly reduced to be reduced to be below 7Pa. The needling static filter cotton after processing has the outstanding characteristics that the filtration efficiency is high, the filtration resistance is ultralow and the service life is long, the physical properties such as longitude and latitude brute force property and a wear-resisting property are excellent, and the needling static filter cotton is greatly superior to the common melt-blow static filter cotton at present.

The invention provides a double-layer filtering material for an internal combustion engine. The double-layer filtering material is provided with a coarse filtering layer and a fine filtering layer according to the direction of flow; the fine filtering layer consists of fibrillating fiber with the quality fraction between 2 to 100 percent and natural fiber with the quality fraction between 0 to 98 percent, wherein the diameter of the trunk of the fibrillating fiber is 1 to 20 microns, the length of the fibrillating fiber is 0.1 to 10 millimeters, the beating degree of the fibrillating fiber is 12 to 65 degrees SR, the diameter of the natural fine filtering layer fiber is 5 to 30 microns, and the length of the natural fine filtering layer fiber is 0.5 to 3.5 millimeters. The double-layer filtering material realizes to improve the filtering efficiency of the filtering material while keeping low filtration resistance and high capacity of holding dust.

The invention discloses a production method of a hot-rolled non-woven base material and a product of the production method of the hot-rolled non-woven base material. The production method of the hot-rolled non-woven base material comprises the following steps of: A, feeding and mixing cotton; B, breaking and opening; C, air laying; D, lapping; E, hot rolling; F, stiffening process and shaping; and G, cooling, inspecting and coiling to obtain the base material, and weighing and entering warehouse. The stiffening process is one or combination of gumming and surface gluing. The gram weight range of the product obtained by the production method of the hot-rolled non-woven base material is 50 to 250g/ m<2>, the thickness range is 0.1 to 0.8mm, the air permeability is 500 to 6,000L/m<2>.s, and the longitudinal and transverse stiffness can reach 500mg or more. The hot-rolled non-woven base material has very strong flexibility and excellent air permeability; furthermore, the hot-rolled non-woven base material is low in thickness, therefore, the area of a filter material can be increased, the resistance of a filter unit is reduced, and the clogging capacity of the filter unit is improved; meanwhile, the hot-rolled non-woven base material is excellent in stiffness, therefore, the different folding and forming requirements are met; and the cost of the hot-rolled non-woven base material has a more obvious advantage than that of materials with the same application aim.

A filter element is made of a first filtering member, and a second filtering member that is arranged on a downstream side of the first filtering member and is impregnated with an oil. The first filtering member consists of a downstream wet layer that is impregnated with the oil, which is transferred by contact to the second filtering member, and an upstream dry layer that is not impregnated with the oil. A density of the first filtering member may be set smaller than that of the second filtering member.

The invention discloses an air filter materials based on a carbon nano tube and a preparation method thereof. The method comprises the following steps: taking a fibre filter medium as a substrate, and preparing the carbon nano tube on the substrate according to chemical vapor deposition method to obtain the product. The fibre filter medium is made of at least one of the group consisting of quartz fibre, carbon fiber, glass fibre, metal fibre and polymer fiber; according to the invention, the air filter materail based on the carbon nano tube comprises two-level structure so as to solve the problem that the intensity of the carbon nano tube membre is too low as air filter materails, the bulk density is too high, the resistance is too much and the clogging capacity is low, and to implement preparation for high-intensity, high-clogging-capacity, high-efficiency and low-resistance air filter material.

The invention discloses a low voltage electrostatic dust collection module and an air purification device. The low voltage electrostatic dust collection module comprises a positive electrode low voltage electrostatic dust collection unit, a negative electrode low voltage electrostatic dust collection, an electrostatic generator and a degeneration control adjuster, wherein the positive electrode low voltage electrostatic dust collection unit and the negative electrode low voltage electrostatic dust collection at least comprises a layer of electrostatic dust collection filter screen; each electrostatic dust collection filter screen comprises a conductive non-woven fabric filter screen with a microcellular structure; the electrostatic generator continuously conveys a positive charge to the conductive non-woven fabric filter screen in the positive electrode low voltage electrostatic dust collection unit, and continuously conveys a negative charge to the conductive non-woven fabric filter screen in the negative electrode low voltage electrostatic dust collection unit; the degeneration control adjuster is used for monitoring an electric charge quantity change on each conductive non-wovenfabric filter screen, and feeding back changed signals to a control system; and the control system controls a periodic intermitting supply manner of the electrostatic generator and the magnitude of output voltage according the feedback signals. The conductive non-woven fabric filter screens are utilized for loading a static charge so as to form a contact electrification mechanism, so that the generation of ozone can be completely avoided.

The invention discloses a perforated plate fresh air introducing and purifying device and belongs to the technical field of air energy recycling and high efficiency energy saving in ventilation equipment. The device comprises a perforated plate purifying, energy recycling and heating core, a fresh air machine, an exhaust fan and an electric cabinet, wherein the size of the perforated plate purifying, energy recycling and heating core is 160mm*160mm to 350mm*350mm; the perforated plate purifying, energy recycling and heating core comprises 45 to 2400 pieces of perforated plate semi-closed conductive combinations and corrugated pieces; each perforated plate semi-closed conductive combination comprises a perforated plate, conductive bands, purifying copper sheets A and B, and heating copper sheets A and B; a square hole shaped fresh air channel with the side length being 1 to 20mm is formed in the perforated plate; the conductive bands are printed or sprayed on the two outer surfaces of the perforated plate; the purifying copper sheets A and B and the heating copper sheets A and B are respectively adhered to the two ends of the conductive bands on the two outer surfaces of the perforated plate; the perforated plate semi-closed conductive combinations and the corrugated pieces form 90 degrees and are assembled alternately and crosswise. The perforated plate fresh air introducing and purifying device has the benefits that new pollutant, such as ozone and the like, is not produced, energy can be efficiently recycled, condensation cannot be produced when the device is used in cold regions, and meanwhile the purification efficiency is high.

The invention relates to a composite nanofiber air filtration material and a preparation method thereof. The material comprises a nanometer polyvinyl alcohol fiber layer and an interweaving layer of nanometer polyvinyl alcohol fibers and polyacrylonitrile fibers, the air filtration material in the four layer structure of the nanometer polyvinyl alcohol fiber layer and the interweaving layer of the nanometer polyvinyl alcohol fibers and the polyacrylonitrile fibers in cross distribution is obtained through one-time electrostatic spinning, the diameter of the polyvinyl alcohol fiber layer ranges from 400 nm to 1,000 nm, the diameter of the electrostatic spinning polyacrylonitrile fibers ranges from 150 nm to 500 nm, the porosity ranges from 75% to 90%, the average pore size ranges from 0.4 mu m to 6 mu m, and crosslinking treatment is performed. The performance that the composite nanofiber air filtration material is not prone to layering and better mechanical properties can be obtained, the filtration efficiency to NaCl aerosol with number median diameter of 75 nm ranges from 99.94% to 99.99%, and the pressure is reduced to be 180-600 Pa. The material is particularly suitable for fields such as personal protective products, air quality testing equipment and air purification devices.

The invention provides a personal respirable dust sampling device. The personal respirable dust sampling device comprises a sampling box, a filter screen, a sampling filter membrane and a driving device, wherein the sampling box is used for providing an installation space for a sampling component; the filter screen is installed inside the sampling box, comprises a rough filter screen used for filtering out particles exceeding the dust sampling standard, and a fine filter screen used for filtering dust conforming to the sampling standard in a grading manner; the sampling filter membrane is installed at one end of a gas outlet of the fine filter screen and is used for adsorbing filtered dust and is taken as an analysis sample of dust content; the driving device comprises a driving motor and a driving shaft which simultaneously penetrates through axle lines of the rough filter screen and the fine filter screen to drive the rough filter screen and the fine filter screen to simultaneously rotate. According to the device, the technology of combination of impact type separation and a double-layer conical surface filter screen is adopted, the dusty environment is sampled, large granular dust can be separated firstly by utilizing the rough filter screen, and then respirable dust conforming to the regulations of a BMRC sampling efficacy curve is separated by utilizing the fine filter screen, so that the sampling precision is improved.

A filter element comprises an oil-impregnated filtering member, and a transmission preventing layer formed on a downstream side of the filtering member, for restricting transmission of at least the carbon dusts from the oil-impregnated filtering member. The filtering member may be formed like a ridge-like-folded structure. The transmission preventing layer may be formed of a coating layer having a resistance against a viscous oil that is impregnated in the filtering member. This coating layer may be formed uniformly as a whole or the thickness or the content of the coating layer may be increased partially. A ventilation shutting-off member (filling layer) may be formed as the transmission preventing layer in the root portion areas of the ridge portions. The transmission preventing layer may comprise a resistant component that is insoluble in the oil that is impregnated in the filtering member.

A filter medium includes a porous film and a support material supporting the porous film. The porous film includes polytetrafluoroethylene, has an average pore diameter of at least 2.5 μm, and has a porosity of at least 95%. A pressure loss is less than 100 Pa when air is passed through the filter medium at a velocity of 5.3 cm/sec. A collection efficiency of NaCl particles is at least 95% when air including NaCl particles with a particle diameter of 0.3 μm is passed through the filter medium at a velocity of 5.3 cm/sec. A PF value is at least 30, where PF={−log [(100−collection efficiency (%))/100]/pressure loss (Pa)}×1000. A dust holding capacity of polyalphaolefin particles held in the filter medium is at least 15 g/m² when air including polyalphaolefin particles with a count median diameter of 0.25 μm is continuously passed through the filter medium at a velocity of 5.3 cm/sec and pressure loss reaches 300 Pa.

The invention discloses a high dust holding filter material for a filter bag. The high dust holding filter material is in a three-layer overlap structure formed by clamping a middle dust holding layer clamped by an upper protective layer and a lower protective layer, wherein the three layers are compounded into a whole by adopting a punching or ultrasonic welding process; the total gram weight of the high dust holding filter material is 50-200g/m<2>; the upper protective layer and the lower protective layer are made of polypropylene spunbond nonwoven fabrics with the gram weight of 10-30g/m<2>. The invention aims to give a certain strength to the high dust holding filter material, the dust holding layer is clamped, and the effects of fixing fibers and preventing the fibers from dropping are achieved. Moreover, the dust holding layer is a key layer of the high dust holding filter material, has the gram weight of 30-140 g/m<2> and is made of a polypropylene short fiber raw material, and a high-bulk high-porosity three-dimensional stereoscopic structure is manufactured by utilizing the mechanical carding and mechanical wet forming technology. The high dust holding filter material has the characteristics of high dust holding capacity, high processing performance and the like.

The invention provides a multifunctional high-efficient cleanable filter screen, comprising a frame. Cleanable filter materials, a multifunctional filter screen and glass fiber are fixed in the frame by adhesive matters. The invention also provides a preparation method of the multifunctional high-efficient cleanable filter screen. In the preparation method, one layer of filter materials and one layer of glass fiber are sandwiched by two layers of reinforced nets which are then folded and formed by a folding machine, processed as suitable size by a cutting machine, compounded by the multifunctional filter screen and the glass fiber, and finally fixed in the frame by the adhesive matters. The multifunctional high-efficient cleanable filter screen has the advantages of high filtering efficiency, easy cleaning and long service life. Furthermore, various additional functions are added of which materials with durable effects are gradually released by a special inducer.

A filter fan of a switch cupboard or of an electrical and/or electronic device placed in a casing with a blast producing an air flow and with a filter element (3) which is placed in the air flow and separates a clean side, on which the blast is placed, from an unclean side, wherein the filter element is held in a frame which can be fixed on the casing by covering the air passage opening penetrating through the casing wall and wherein a protective grid (4) is placed between the filter element (3) and the blast, the invention proposes that a bridging-free distance is provided between the filter surface of the filter element (3) and the protective grid (4), wherein this distance is dimensioned so as to make possible the discharge of water drops on the clean side surface of the filter element and to avoid a contact of the water drops with the protective grid.

The invention discloses a polylactic acid filament yarn non-woven filter material and application thereof. Most of the existing air filtration materials adopt non-renewable materials, thus bringing difficulty in follow-up waste treatment. The filter material comprises 100% polylactic acid filament yarn fiber net, and is prepared by the following steps of firstly thoroughly drying pre-crystallized polylactic acid slices; then melting and squeezing by more than two groups of spinning machines, cooling, drafting and separating yarns so as to form nets respectively, and overlaying to form a composite fiber net; finally, rolling the composite fiber net into a whole by a hot mill. The filter material has a surface filtration effect, has the characteristics of high filtration efficiency, large clogging capacity, low resistance, good air permeability, low ash removal frequency, antibacterial performance and deodorization, and can be completely degraded after being discarded.