Multilayer filtering material
FIELD: textile fabrics, paper.
SUBSTANCE: invention is related to multilayer filtering materials. Suggested nonwoven material consists of inlet and outlet layers. Outlet layer consists of main and additional sublayers previously attached to each other. Inlet layer and main sublayer of outlet laye consist of mixture of hollow silicone fibre with linear density of 0.68 tex and polypropylene fibre with linear density of 2 tex, and additional sublayer of outlet layer consists of polypropylene fibre with linear density of 0.68 tex. Ratio of surface densities of inlet and outlet layers makes 1:1÷1:1.5.
EFFECT: improved operational properties.
The invention relates to the production of nonwoven filter media, designed for cleaning atmospheric air from dust, which comes in spray-drying chamber, mounted on the car plants and car factories.
Known multilayer filter material described in A.S. No. 1583142, CL IPC B01D 39/16, published. 07.08.90. The material is intended for cleaning atmospheric air from dust, including coming in internal combustion engines.
According to the invention a multilayer non-woven filter material extends from the air inlet side of the loose layer of coarse synthetic fibers and on the output side of the air tight layer of thin synthetic fibers. The layers are connected by bundles of fibers through hypoproteinemia. Between loose and dense layers placed intermediate layer in the form of a flat glued or thermally bonded non-woven material.
Describes the material due to the weakly bonded structure and the presence of the intermediate layer is partially destroyed when the bond hypoproteinemia areas may not provide sufficient filtration and high dust holding capacity with a slight increase in the resistance required when cleaning atmospheric air supplied to the spray-drying chamber.
This material bol is the most similar essential features and their purpose is the closest analog is proposed and can be used as a prototype.
The objective of the invention is to provide a filtering material having high dust holding capacity up to 8000 g/m2and providing a nominal fineness of dropout 15 microns.
This technical result is achieved due to the fact that the output layer consists of pre-bonded between a primary and secondary, hardened by heat treatment, sub-layer and the input layer and the main sublayer of the output layer consists of a blend of hollow siliconized fiber linear density of 0.68 Tex and polypropylene fibers with a linear density of 2 Tex with a ratio of fibers (wt%) 40:60, and an additional sublayer of the output layer consists of polypropylene fibers with a linear density of 0.68 Tex, and the ratio of surface densities of the primary and secondary sublayers is (wt.%) 80:20 with a ratio of surface densities of the input and output layers 1:1÷1:1,5.
Coarse polypropylene fibers produce three-dimensional frame structure, which is filled with siliconized fibers with specific smooth slippery surface. Due to this particle contamination when filling patterns, easily gliding over the surface of the fibers, redistributed, without clogging interfibrillar space that provides slow growth resistance.
Additional sublayer of the output layer of finer fibers provides barrier properties of the filter material and the detention of smaller particles, and it melted the surface eliminates the entrainment of small particles of fiber and getting them into working solutions spray chambers, which is very important when painting vehicles.
Summary of the invention the following examples 1 and 2.
Example 1. Fibrous base multilayer filter material formed in a known manner (see, for example, Mderately and other Mechanical technology production of nonwoven materials. M: Light industry, 1973, str). Input pre-bonded layer formed of a mixture of hollow siliconized fibers with a linear density of 0.68 Tex and polypropylene fibers with a linear density of 2.0 dtex when the ratio of fibers (wt%) 40:60. When generating the output layer on the sublayer siliconized fibers with a linear density of 0.68 Tex and polypropylene fibers with a linear density of 2.0 dtex when the ratio of fibers (wt%) 40:60 incorporating a sublayer of polypropylene fibres and with a linear density of 0.68 Tex. The formation of layers of the led so that the ratio of surface densities of the input and output layers was 1:1. Both layers were bonded by hypoproteinemia. The sublayer of the polypropylene fiber is n condensed by processing on the calender under certain temperature and pressure.
Example 2. Input pre-bonded layer formed of a mixture of hollow siliconized fibers with a linear density of 0.68 Tex and polypropylene fibers with a linear density of 2.0 dtex when the ratio of fibers (wt%) 40:60. When generating the output layer on the sublayer siliconized fibers with a linear density of 0.68 Tex and polypropylene fibers with a linear density of 2.0 dtex when the ratio of fibers (wt%) 40:60 incorporating a sublayer of polypropylene fibres and with a linear density of 0.68 Tex. The formation of layers of the led so that the ratio of surface densities of the input and output layers was 1:1,5. Both layers were bonded by hypoproteinemia. The sublayer of polypropylene fibers was condensed by processing on the calender under certain temperature and pressure.
The obtained filter material used in painting and drying chambers, installed in automotive plants and car factories.
The test results of the filtering ability of the developed material by the method of electron microscopy are presented in figure 1 and 2.
The test results confirm the result.
Multilayer filter material, including input and output layers of synthetic fibers, bonded together by bundles of fibers by means of acupuncture is rotaliana, characterized in that the output layer consists of pre-bonded between a primary and secondary, hardened by thermal treatment of substrates, the input layer and the main sublayer of the output layer consists of a blend of hollow siliconized fiber linear density of 0.68 Tex and polypropylene fibers with a linear density of 2 Tex with a ratio of fibers (wt.%), is 40:60, and an additional sublayer of the output layer consists of polypropylene fibers with a linear density of 0.68 Tex, and the ratio of surface densities of the primary and secondary sublayers is (wt.%) 80:20 with a ratio of surface densities of the input and output layers are 1:1÷1:1,5.
FIELD: means of protection.
SUBSTANCE: invention relates to production of a filtering and sorbing material used in the means of personal respiratory protective equipment to cleanse the air form fumes and aerosols of hazardous substances. The filtering and sorbing material containing polypropylene fibers filled with microatomised carbon, fibers of sulfate unbleached cellulose and fibers of mercerised cellulose is obtained by adding the polypropylene fibers in the amount 5-10% of the total mass at the stage of grinding the sulfate unbleached cellulose after which combined grinding of the mixture is continued until the grinding degree of 28±2°SHR is reached, the mixture is then mixed with the fibers of mercerised cellulose and carbon, paper web is poured dried and treated with an impregnating solution containing nickel chloride (II) - 10%, ferrous chloride (III) - 10%, copper chloride (II) - 10%.
EFFECT: production of elestic well draped filtering and sorbing material with high mechanical and adsorbtion characteristics and a low aerodynamic resistance to respiration.
1 tbl, 1 dwg
SUBSTANCE: method involves as follows. Electroformed nonwoven fibrous polymer fabric is impregnated with aqueous or aqueous-alcoholic suspension of aluminium material particles then hydrolysed by heating the suspension impregnated fabric that is impregnated by suspension spraying over its surface. The heating process in performed in the open air at relative humidity at least 70%, preferentially 95-100% of at least two stacked suspension impregnated fabrics. Upon termination of hydrolysis process, plane parallel wringing of the fabrics follows.
EFFECT: improved performance of a sorbent owing to formation of the composite sheet sorbent involving uniform distribution of porous particles of oxide-hydroxide aluminium phases over the entire volume of the fabric, formation of the sheet sorbent fabric of uniform thickness and density.
7 cl, 2 ex, 1 tbl
FIELD: technological processes.
SUBSTANCE: invention is related to the field of fibrous filtering materials. Filtering material is suggested for respirators, which contains working layer of fibres with diametre of 1-10 mcm produced by method of electrostatic moulding from solution containing 6-16 wt % of polycarbonate in mixture of dissolvents that consists of dichloroethane and methylene chloride with their mass ratio of (1-5):(9-5), accordingly, and having surface density of 30-60 g/m2. Respirator is made with application of produced material.
EFFECT: improved mechanical strength of material and products on its basis.
4 cl, 1 dwg, 2 tbl
FIELD: technological processes.
SUBSTANCE: electret article comprising polymer material, which has electret charge given to it, besides, polymer material includes one or several types of heteroatoms, and coefficient of saturation with fluorine that represents ratio of atomic percentage ratio of fluorine relative to amount of saturated and unsaturated fluorine-containing groups, does not exceed approximately 200, moreover, atomic percentage content of fluorine makes at least approximately 40%. Article is used as filtering material in respirators, filters and face masks.
EFFECT: provision of high quality of material.
22 cl, 5 dwg, 8 tbl
FIELD: textile, paper.
SUBSTANCE: invention relates to fibrous filtering materials. Filtering fibrous material is proposed which is produced by electrostatic formation from a solution of polymer mixture - sterol copolymer with acrylonitrile and polyurethane with their weight relation of (50-95):(50-5) respectively, diametre of 1-10 mcm; the material is characterized by the unit area weight of 2070 g/m2 and aerodynamic resistance of 3-30 Pa under the air flow speed of 1 cm/s. Method of the material production and respiratory personal protective gear made from it are proposed as well.
EFFECT: providing for effective filtering material with improved physical and chemical parametres.
5 cl, 1 dwg, 2 tbl, 4 ex
SUBSTANCE: filter is made of nonwoven fabric and/or injected filter structures or sheets, i.e. produced after processing the synthetic artificial fibres. At first fibres are processed with antibacterial compounds and sliced to monothreads. Natural, artificial, synthetic, metal fibres or their mixtures are used. Web and felt are formed from these threads. Required number of nonwoven fabric layers is connected, thereafter processed, sliced and rolled.
EFFECT: extended application of aforesaid filters, improved wetting and filtering ability ensured.
31 cl, 16 dwg, 11 ex
FIELD: technological processes.
SUBSTANCE: invention is related to the field of fibrous filtering materials production. Materials are suggested from polystyrene and polymethyl methacrylate with fiber diameter of 1.5-3 mcm. Materials are produced by means of electrostatic moulding of fibres from polystyrene or polymethyl methacrylate solution in organic dissolvent, which is ethyl acetate or dichloroethane that have been previously purified till content of admixtures is not more than 0.001 wt %, at that polystyrene and polymethyl methacrylate prior to dissolution are purified till content of admixtures is not more than 0.01%, and electric moulding is realised in air medium, which is dust-free till particles content is not more than 0.01 mg/m3 and relative humidity of not more than 35%.
EFFECT: invention makes it possible to produce filtering easily-cindered materials that are efficient in analysis of gas mediums for inorganic aerosol admixtures.
3 cl, 1 tbl, 2 ex
FIELD: technological processes.
SUBSTANCE: group of inventions is related to production of sorbtion-filtering materials for purification of gases from organic and inorganic chemical substances. Filtering material contains at least two layers of base from nonwoven polymer fibrous material and particles of aluminium oxide hydrate fixed on fibres on one side of every layer surface, at that surfaces with fixed particles of aluminium oxide hydrate of two layers are folded towards each other, thus layer of aluminium oxide hydrate particles is created between mentioned layers of base, which has sorbtion properties. Material is produced by application of aluminium-based material particles on one side of nonwoven polymer fibrous material, subsequent folding of two such treated material cloths with treated surfaces towards each other and performance of hydrolysis with creation of layer of aluminium oxide hydrate particles between two cloths.
EFFECT: suggested filtering material has high sorbtion properties, high efficiency of air purification from contaminants of organic and inorganic origin and low aerodynamic resistance.
14 cl, 2 dwg, 2 tbl, 2 ex
SUBSTANCE: invention concerns application of polymerisates containing thermoplastic polymers, as filtering auxiliary and/or stabilising substances, and method of water fluid filtration and/or stabilisation. Water fluid filtration and/or stabilisation uses polymerisate in the form of polymer powder containing the following components, wt %: (a) 20 to 95 of at least one thermoplastic polyolefin and polyamide polymer, and (b) 80 to 5 of at least one substance selected out of group including silicates, carbonates, oxides, silica gel, kieselguhr, diatomite earth and linked polyvinyllactams and their mixes. Polymer powder is obtained by compounding of thermoplastic polymer (a) and substance (b) in extruder with physical and/or chemical interaction.
EFFECT: adjustable absorption by the use of insoluble, recoverable, chemically inert, slightly inflating polymerisates with large surface area.
26 cl, 2 tbl
FIELD: technological processes.
SUBSTANCE: invention is related to production of highly porous multi-layer polymer materials for manufacture of filtering elements, which are used for filtration of oil products, technological fluids, gases and water. Method includes fractional filling of form sections with powdery polyethylene, which are separated by at least two partitions, mechanical sealing, simultaneous sintering of form sections content into layers of porous one-piece filtering element, forced cooling, pressing-out of filtering element from form and mechanical processing. Filtering element contains at least three one-piece sintered open-porous layers made of different fractions of powdery polyethylene from the following group: ultrahigh molecular polyethylene and polyethylene that is radiation-modified by gamma radiation, with dimensions of pores from 1 to 200 micrometer. Neighbouring layers may be divided by partitions made of filtering paper.
EFFECT: increase of manufacturing process efficiency, increase of sorption capacity and durability of filtering element, possibility to produce thick-wall filtering elements of complex shape.
17 cl, 2 dwg
FIELD: methods of production of electret items, electret filters and respirators.
SUBSTANCE: the invention presents a method of production of electret items, electret filters and respirators with heightened resistivity to the oil mist. The invention falls into production processes of electret items, electret packed beds and respirators, and may be used for removal of corpuscles from gases, especially for removal of aerosols from air. The method provides for: formation of a melted material consisting of a mixture of a polymer composed of a mixture of a polymer representing a non-current-conducting thermoplastic resin with a specific resistivity exceeding 1014 Ohms·cm with a fluorine compound as an additive compound; shaping it to the required form and quenching it up to the temperature lower than the melting point of the polymer. The material is calcined and treated with an electric charge to give it electret properties. The invention improves the capability of filtering oily aerosols.
EFFECT: the invention improves the capability of filtering oily aerosols.
19 cl, 16 tbl, 19 dwg, 23 ex
FIELD: methods for imparting charge to fibrous webs by means of non-aqueous liquid for usage of said webs as filters in filtering face masks for protection of user's mouth and nose.
SUBSTANCE: method involves wetting web formed from non-conductive fibers with non-aqueous polar liquid; substantially drying web for producing fibrous electronic web. Method differs from known methods of imparting charge to web in that it requires less energy for drying of web than methods using aqueous liquids. Also, many kinds of filaments poorly wetted with aqueous liquids are immediately wetted with non-aqueous liquids.
EFFECT: increased efficiency and simplified method.
12 cl, 2 dwg, 6 tbl, 26 ex
FIELD: fine-fiber filtering materials.
SUBSTANCE: the invention is pertinent to fine-fiber filtering materials used for individual means of protection of respiratory organs. The invention offers a protection material, a means of protection containing the offered material and a method of production of the fibrous material providing for electrostatic forming of the fibrous material from a solution of styrene copolymer with acrylonitrile in an organic solvent at the presence of electrostatic additives of bromide or iodide salts of tetraethyl- or tetrabutyl-ammonium. At that a solution containing an additive of a high-molecular methylmethacrylate in amount of 0.001-0.01 mass % in the capacity of dissolvent is used a mixture of ethyl acetate with butyl acetate at their mass ratio in the solution from 1/9 up to 9/1 accordingly. The invention allows to produce a material with improved mechanical characteristics and to provide stability of the production process.
EFFECT: the invention ensures production of the material with improved mechanical characteristics and stability of the production process.
5 cl, 2 tbl, 1 ex
FIELD: fine filtration of air; cleaning ventilation emissions from oil mist; cleaning air in venting pipe lines of gas-transfer unit oil tanks.
SUBSTANCE: proposed filter includes filter element with filter medium made from coarse and fine fibers laid in between outer and inner cylinders, cover and bottom. Filter medium is made from longitudinal and transversal oil-resistant synthetic (polypropylene) fibers; ratio of mass of longitudinal and transversal fibers is equal to (6-8) : 1 and ratio of diameters of thin and coarse fibers is equal to (0.5-1) : 10.
EFFECT: enhanced efficiency of cleaning at considerable increase of service life, oil return coefficient; enhanced ecological safety around compressor stations.
2 cl, 2 dwg
FIELD: filtering materials for liquid and gaseous fluids.
SUBSTANCE: filtering material is made of thermoplastic polymeric fibers. The density of material increases downstream, whereas the diameter of fibers decreases downstream. The inner layer of the material has areas the density of fibers in which is lower than the averaged density of upper layers by a factor of 2-6.
EFFECT: enhanced strength.
1 dwg, 1 tbl
FIELD: polymer materials and gas treatment.
SUBSTANCE: invention relates to polymeric fibrous filter materials designed for effective cleaning of air stream due to realization of mechanical and electrostatic filtration. Material suitable for use in respiratory masks contains (i) a layer in the form of cloth 1 mm thick made from polypropylene fibers with diameter 0.5-1.5 μm, packaging density 0.25-0.30 g/cm3, and electric charge with surface density 17-21 nCl/cm2, the layer being made by aerodynamic atomization of melt and electrization of fibers in corona discharge field during their formation, and (ii) an additional layer in the form of non-electrized cloth 1 mm thick made from polypropylene fibers with diameter 10-20 μm and packaging density 0.25-0.30 g/cm3, which is placed on the side directly facing air stream to be cleaned, the two layers being attached to each other by spot weld. Presence of two layers results in separate but complementary realization of mechanical and electrostatic filtration.
EFFECT: enhanced air cleaning efficiency and prolonged lifetime of filter material.
FIELD: methods and devices used for production of fibrous electret linen.
SUBSTANCE: the invention is pertaining to methods and devices used for production of fibrous electret linen. The method of giving of an electrostatic charge to the fibrous non-woven linen provides that the fibrous linen is soaked with a wetting liquid, then it is saturated with a water polar liquid and dried. The gained dry product represents an electret, which may be efficiently used in the air filters, for example, in respirators.
EFFECT: the invention ensures production of a fibrous electret linen, which may be efficiently used in the air filters, for example, in respirators.
13 cl, 3 ex, 5 tbl, 4 dwg
FIELD: chemical industry; oil refining industry and other industries.
SUBSTANCE: the invention is pertaining to production of materials for the filtering water-separating elements used in devices for purification of organic fluids, predominantly, hydrocarbon fuels, oils, oil products from the emulsified water and mechanical impurities, and may be used for purification of aircraft and car fuels in chemical industry, oil refining industry and other industries. The porous reinforced material is produced out of a permeable in all directions polymeric material with a side-porous deep structure having a total porosity of no less than 50 % with the sizes of the elementary pores, predominantly, of 10 - 200 microns. At that the porous reinforced material is formed out of a framed material having filaments or fibers with a diameter, predominantly, of 5 - 400 microns, and an arranged between the above mentioned filaments or fibers filler manufactured out of a porous polyvinyl formal produced by the method of a dew-point structurization with the thermal treatment of a homogenized in water composition containing at least polyvinyl alcohol and aldehyde. The element for the screen-water-separator contains a filtering-coagulating septum embraced by a perforated shell rings and limiting from above and from below covers. At that the septum is made multilayered out of a sheet manufactured out of the above porous reinforced material. The technical result consists in an increased effectiveness of purification of fuels (jet engine fuels and diesel fuels) and the gaseous oil products from water, and also asphalt-resinous and sulfur-containing materials, an increased service life and productivity of the filtering screens based on the indicated filtering-coagulating material.
EFFECT: the invention ensures an increased effectiveness of purification of jet engine fuels, diesel fuels, gaseous oil products from water and also asphalt-resinous and sulfur-containing materials, service life and productivity of the filtering screens based on the filtering-coagulating material.
13 cl, 3 dwg
FIELD: methods of production of filtering materials.
SUBSTANCE: the invention is pertaining to the methods of production of filtering materials, in particular, to the method of production of the filtering fibrous materials, which may be used in a means of individual protection. The filtering fibrous material is produced by an electrostatic formation of a non-woven fibrous material from a working polymeric fiber-forming solution with dynamic viscosity of 1-30P, electrical conduction of 10-4-10-7 ohm-1 cm-1 in an electrostatic field at a potential difference from 10 up to 150 kV. The solution contains in the capacity of the polymer from 8.9 up to 24.6 mass % of styrene copolymer with 5.2-30.4 mass of acrylonitrile or triple styrene copolymer with 5.2-30.4 mass of acrylonitrile and 3.7-42.1 mass % of methyl methacrylate. As a dissolvent they use ethyl acetate, or butyl acetate either their mixture. The solution in addition contains high-molecular polymethyl methacrylate, a distilled water, the lowest alcohol taken from the group ethyl alcohol, methyl alcohol or isopropyl alcohol, at the following contents of ingredients of the polymeric fiber-forming solution, in mass %: polymeric compound - 8.9-24.6; high-molecular polymethyl methacrylate - 0.011-0.02; distilled water - 0.01-0.1; the lowest alcohol - 17-28; dissolvent - the rest. The efflux of the working polymeric fiber-forming solution is exercised at the volumetric speed of 0.1 up to 6 cm3 /minute. Feeding of the working polymeric fiber-forming solution is conducted from the space interval of 12-42 cm beginning from the point of its coming out from the batching device up to the settling surface. The produced filtering fibrous material contains a technological and a working layers made out of the polymeric fibrous material produced by the above described method. The technological layer material has the surface density of 1-3 g/m2 and is made out of fibers of 3-5 microns diameter. The working layer material is made out of fibers of 1.5-3 microns diameter. The double-layer material has the surface density of 32-38 g/m2, the standard resistance of 0.8-1.2 mm of the water column and the skip coefficient of no less than 95 %. The invention ensures an improved quality of the filtering material due to an increase of efficiency of penetration of fragments with a diameter of 0.3 microns at the standard resistance of 1.0 mm of the water column.
EFFECT: the invention ensures an improved quality of the filtering material, an increased efficiency of penetration of fragments with a diameter of parts of microns at the standard resistance of 1 mm of the water column.
4 cl, 2 ex
FIELD: natural gas industry; petrochemical industry; oil-producing industry; other branches of industry; methods of production of filtering materials and the filters for purification of gases and aerosols.
SUBSTANCE: the invention offers the filtering material made out of the polysulfone fibers with different diameter of the fibers produced by electromolding from the solution in the organic solvent with addition of an electrolyte; and the frame design filter supplied with the produced material having the density of 30 - 50 g/m2. The invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.
EFFECT: the invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.
5 cl, 1 tbl, 1 dwg