5937 results about "Filter paper" patented technology

A pod for holding an amount of mixable material. The pod may include a circular sidewall and a base. The base may include a number of apertures. A substantially stiff filter paper may be positioned about the base.

A single cup pod beverage brewer is presented utilizing a pod (20) containing coffee grounds or tea leaves surrounded by filter paper. A pod holding chamber (22) consisting of a upper head (26) and a lower head (28) having an ejection disc (42). An upper head mounting frame (48) is attached to its horizontal base (50) and includes lower head rotating arms (60) attached to a first shaft (62) with a first gear motor (66) rotating the arms into a pod loading position, a pod brewing position and a pod disposal position. A second gear motor (66a) is secured to the upper head mounting frame, driving a cam (76) through a second shaft (62a) engaging the upper head to lower, seal and raise said upper head. A pod ejector solenoid (84) is disposed on the base electromechanically propelling the pod from the chamber when the lower head in the pod disposal position. An electronic control system employs a solid state direct current arrangement for control regulation and alternating current for heating system functions. An enclosure with panels and a door (90) protects moving elements and electrical controls.

A filter element in which several layers (2, 3, 5, 7, 8) made of a filtering medium are joined contiguously in the direction of flow with at least one layer (2, 7) made of a filtering medium with a high storage capacity and a low degree of separation being arranged on the in-flow side and at least one layer (3, 8) made of a filtering medium with a low storage capacity and a high degree of separation being arranged on the out-flow side. Preferably the in-flow filtering medium is made of a filter paper containing cellulose or of a melt-blown material, and the out-flow side filtering medium is produced from a filter paper containing cellulose.

The invention discloses a device for testing the mechanical properties of a pile-soil contact surface. The device is composed of a sealed pressure chamber, a hollow cylindrical soil sample, a solid cylindrical concrete pile sample and the like. The pile sample is prefabricated, and its diameter is equal to the internal diameter of the hollow cylindrical soil sample, and the two samples joint together closely. The lower end of the concrete pile sample is disposed on a pedestal through a spring assembly, and the upper end is connected to a stress loading system through a dowel bar, which is provided with a stress sensor and a displacement sensor I. The outside of the concrete pile sample is the hollow cylindrical soil sample. Filter paper and permeable stones are disposed at the lower end of the soil sample, and the lower end is positioned on the pedestal, while the upper end of the soil sample is provided with filter paper, permeable stones, a top cover and a displacement sensor II in order. During test, a confining pressure is exerted first for consolidating, and then a static (dynamic) load is exerted on the pile sample for measuring the axial deformation, pore water stress and the like of the pile and the soil. The device provided in the invention has a simple structure, is easy to realize, and can be used to measure the mechanical properties of a pile-soil contact surface under the action of a static (dynamic) load.

A battery powered portable human body carrying electronic human breath filtration device is an electronic nose mask and is the most ideal alternative to conventional filter paper type nose mask. It utilizes electronic ionization technique and electrostatic field to remove air borne particles, dust, pollens, contaminants, bacteria, viruses, toxic chemical, fume and tobacco smoke from human inhalation and exhalation breath. It interacts with human breathing action as the air flow driving system to move the inhalation and exhalation breaths through the electronic filter elements, in addition to a front louver cover and a rear louver cover's protection as pre-filters. The system requires very low running current and uses small batteries usually found in household electronics. This filtration system is light weight with negligible air flow resistance and is integrated into the nose mask which is connected to a pocket size control system via a connection cable.

The invention discloses a fluorescent microsphere immunity-chromatography test strip for detecting food-borne pathogenic microorganisms in a rapid, specific, qualitative and quantitative manner and a preparation method thereof. Filter paper, a sample pad, a glass fiber membrane spray-painted by fluorescent microsphere marked food-borne pathogenic microorganism monoclonal antibodies or polyclonal antibodies, a nitrocellulose membrane and drinking paper are stuck to an underplate orderly in a related joint manner; the food-borne pathogenic microorganism monoclonal antibodies or the polyclonal antibodies are coated on the nitrocellulose membrane and are used as a detection area; and anti-mouse antibodies are coated on the nitrocellulose membrane and used as a quality control area. The test strip has the preparation steps as follows: (1) samples to be detected are processed; (2) the nitrocellulose membrane is prepared; (3) a fluorescent microsphere pad is prepared; (4) the test strip is assembled; and during the detection process, the CCD scanning technique is utilized to collect all emission spectrums, and then the emission spectrums are analyzed through a fluorescence analyzer and relevant software after accumulation and multiplication, so that the quantitative detection is realized. The fluorescent microsphere immunity-chromatography test strip and the preparation method thereof are mainly used for qualitative and quantitative detection of all the food-borne pathogenic microorganisms in food safety inspection.

The present invention generally relates to systems and methods for receiving blood (or other bodily fluids) from a subject, e.g., from or beneath the skin of a subject. In some cases, the blood (or other bodily fluids) may be deposited on a membrane or other substrate. For example, blood may be absorbed in a substrate, and dried in some cases to produce a dried blood spot. In one aspect, the present invention is generally directed to devices and methods for receiving blood from a subject, e.g., from the skin, using devices including a substance transfer component (which may contain, for example, one or more microneedles), and directing the blood on a substrate, e.g., for absorbing blood. The substrate, in some embodiments, may comprise filter paper or cotton-based paper. After absorption of some blood onto the substrate, the substrate may be removed from the device and shipped or analyzed.

A pod for holding an amount of mixable material. The pod may include a circular sidewall and a base. The base may include a number of apertures. A substantially stiff filter paper may be positioned about the base.

The invention discloses a test paper strip for the fluorescent bead immunochromatography of veterinary medicine remained in a detected sample and a preparation method thereof. A filter paper, a sample pad, a fiberglass membrane, a pyroxylin membrane and water sucking paper are sequentially stuck on a base plate in related joint; fluorescent beads are sprayed on the pyroxylin membrane for marking a veterinary medicine resistant molecule monoantibody; the pyroxylin membrane coated with a veterinary medicine molecule holoantigen is used as a detection region; the pyroxylin membrane coated with an anti-mouse antibody is used as a quality control region; and the test paper strip is prepared through the following steps: (1) the preparation of the pyroxylin membrane; (2) the preparation of a fluorescent bead pad; and (3) the assembling of the test paper strip. In the detecting process, emitted spectrums pass through a proper optical filter device; and all the emitted spectrums are collected through CCD scanning technology, are congregated, are multiplied and are analyzed through a fluorescence analyzer and relevant software to obtain a quantized fluorescence signal, thereby realizing quantitative detection. The test paper strip is mainly used for the qualitative detection and the quantitative detection of all the veterinary medicine classes in food safety detection.

The present invention relates to a pleated filter made of a multi-layer filter medium, including at least one filter paper layer having area weights of 30-100 g / m2, a microfiber nonwoven fabric layer having area weights 5-120 g / m2 and a support nonwoven fabric layer made of synthetic, polymeric fibers having area weights of 10-120 g / m2. The layers of the pleated filter contain fused polymer areas by which the fabric layers are bonded to the paper layer, and by which the fabric layers are made firmer within themselves. When subject to a fractional efficiency test at an initial pressure difference of at most 180 Pa, at a boundary speed of approximately 2.62 m / s and a flow speed through the filter medium of approximately 0.13 m / s, the pleated filter is able to separate at least 90% of particles greater than 0.3 mum, at least 92% of particles greater than 0.5 mum, at least 93% of particles greater than 1 mum, and at least 97% of particles greater than 3 mum, as measured using the standard method DIN EN 60312 (IEC 60312) § 5.1.2.5.

A method for making, storing and using a surgical graft from equine amniotic membrane in veterinary ophthalmology. The amniotic membrane is obtained from equine placenta, from which the chorion has been separated. Sheets of the amniotic membrane are cut to size and mounted on filter paper. The cells of the amniotic membrane are killed, preferably while being frozen and thawed in the storage solution. The equine amniotic membrane can be used in a variety of ocular surgeries in horses but also other species such as food animals, dogs and cats. It represents a strong biomaterial that will give a good physical support to the ocular tissues while inducing a minimal amount of scarring which is primordial in ocular surgeries in order to obtain the best visual outcome.

The invention relates to a testing system for deep soil freezing / thawing process, which is structurally characterized in that a temperature-controlled box is connected with an external cold bath; a high pressure-resistant organic glass cylinder is arranged on a temperature-controllable steel base; two small holes are formed in the base, one is connected with a water guide pipe, and the other is connected with a pressure adjusting pipe; a permeable stone, a piece of filter paper and a sample are sequentially arranged at the upper part of the lower base, and a temperature sensor is mounted in the sample; a temperature-controllable upper press head is arranged at the upper part of the sample; a line leading-out hole is formed in the upper press head, and is sealed through sealant after the line is lead out; the upper press head is connected with the transmission rod of a testing machine; a measuring cylinder is connected with the sample through the water guide pipe; and the measuring cylinder is arranged on a weighing sensor and fixed through a bracket. By adopting the testing system, the freezing / thawing process of the deep soil can be rather systematically researched, so as to obtain the frost heaving rate and the water absorbing / draining rate of the deep soil which is in different depths frozen under the different temperature gradients. The testing system provides the technical guarantee for the research in clarifying the action of the external load on the forming processes of the freezing soil and the frozen soil cold-formed structures, and the mutual action of the temperature, the moisture content and the pressure of the soil body in the process of freezing under the high-pressure action.

A kit for the rapid detection of pathogens in food supplies. The kit includes a microspot device and one or more indicator reagents to be applied to a well of the microspot device. The employed indicator reagent produces a detectable change upon contact with a pathogen of interest. The microspot device is fabricated from a porous membrane, such as filter paper. A substantially continuous boundary composed of a low melting temperature solid is deposited within the porous membrane extending from the top of the membrane to the bottom of the membrane and defines the peripheral sides of the well. Additionally, a barrier is applied to the bottom of the membrane, thus defining the bottom of the well. The kit can further include growth media for enriching the pathogenic bacteria and instructions for use of the kit employing the microspot device and the one or more indicator reagents.

The invention provides a patterned multilayer array paper chip, a preparation method and an application thereof. The front surface, rear surface and interior of the patterned multilayer array paper chip all have the structures of alternately emerged wax areas and filter paper areas and alternately emerged hydrophilic areas and lyophobic areas. The preparation method comprises the following steps: designing a required pattern by using a computer; printing the wax onto an untreated filter paper surface by using a printing machine; placing a printed patterned multilayer array paper chip into a high-temperature container for roasting; and then taking out and cooling; and packaging, thereby obtaining the wax patterned multilayer array paper chip. The patterned multilayer array paper chip is applied to the high-flux and quick detection for environmental pollutants, such as, the assay determination for heavy metal ions in suitably treated agricultural products, such as, vegetables, neutralized by water. The preparation method provided by the invention is simple, direct, low-cost, high in preparing speed, suitable for mass production of the patterned multilayer array paper chip, and has commercial prospect.

The invention discloses a temperature-controlled type unsaturated soil consolidometer, which can be used for geotechnical engineering measuring apparatus manufacture. The temperature-controlled type unsaturated soil consolidometer comprises a combined type pressure chamber with a bidirectional motion loading pressure piston, a diversion system, a displacement meter and laser metering equipment. Heat conducting oil is filled in a sandwich chamber between the outer side of the combined type pressure chamber and an outer-layer transparent sleeve; and moreover, the sandwich chamber is also provided with a thermoelectric couple and a heating rod to control the temperature inside the pressure chamber. When the temperature-controlled type unsaturated soil consolidometer is used, a filter paper method of suction measurement can be employed for measuring the suction of an unsaturated sample under different temperatures; unsaturated soil drying and watering cycle tests controlled under suction and compression tests under constant suction can be implemented to obtain the influence rules of the temperature on the soil-water characteristic and mechanical characteristic of unsaturated soil; andsoaking expansion deformation tests and expansion pressure tests under different temperatures can be implemented, and the expansion deformation of the unsaturated soil and the changing rules of the expansibility are respectively obtained through the displacement meter or a load sensor. The temperature-controlled type unsaturated soil consolidometer has the advantages of complete functions, simplestructure, convenient operation and high test precision.

A filter paper cup for making a beverage pod. The filter paper cup includes a cover and a base (or receptacle). The filter paper cup is formed by forming pleats in walls and a rim around the tops of the wall. Preferably, a heat seal filter paper is used and the pleats in the walls and rim are adhered by the heat to retain the shape. The base in inserted into a pod holder and brewing material is placed into the base. The cover is folded over the rim, and a lid is attached to the pod holder to sandwich the cover and rim to seal the pod. The cover is held taut by the lid of the pod holder to facilitate penetration of the cover by a needle to inject water into the pod.

The invention discloses an electronic nose for detecting indoor air quality. The electronic nose mainly comprises a nose frame, a shell, a suction fan, HEPA (High Efficiency Particulate Air) filter paper, a nasal cavity, a gas sensor array and a processing circuit integration module thereof, a DSP (digital signal processor), a human-computer interaction interface, a harmful gas absorption and purification device and the like. The electronic nose is characterized in that indoor air to be detected is sucked into the nasal cavity by the suction fan through the HEPA filter paper to perform a full reaction with the gas sensor array; the measurement and identification of harmful gases in the air are completed inside the nasal cavity; then the harmful gas absorption and purification device is used for absorbing and purifying harmful gases with high concentration. The electronic nose has the characteristics of small size, anti-interference, quickness, accuracy, secondary pollution prevention and the like, and is suitable for detecting the harmful gases in the indoor air.

The invention relates to a preparation method and an application of an ultra-hydrophobic and ultra-lipophilic paper-based separating material. The preparation method comprises that: (1) a sol solution of silicon dioxide nano-particles with a particle size of 24 to 36nm is prepared with existing technologies; (2) the solution is modified with a silanizing reagent; (3) a piece of filter paper is immersed in the modified nano-particle solution for 10 to 20 seconds, and is naturally dried, such that an ultra-hydrophobic and ultra-lipophilic paper-based separating material is obtained. The surfaceof the material possesses micron-sized apertures. The contact angle between the separating material and the water surface is larger than 150 DEG. The material has a good ultra-hydrophobic performance, and is acid resistant and organic solvent resistant. The material can be used repeatedly, and can be used for absorbing oil stains floated on water surfaces. The material brings an excellent separating effect to oil-water mixtures, especially oil-water emulsion with high viscosity, and has wide application prospect in industrial oil-water separation and water area oil stain cleaning. According to the present invention, the preparation technology is simple, the requirement for equipment is low, the preparation condition is not restricted by region differences, and mass industrial production can be realized easily.

The invention discloses a making method of composite tissue engineering rack of original poring self-solidifying calcium phosphate, which comprises the following steps: placing porous rack of calcium phosphate cement into drier to dry; immersing porous rack into macromolecular solution; extracting into vacuum for 0.5-6h; injecting macromolecular material into the pore of porous rack of calcium phosphate cement; drying the surface of porous rack through filter paper; pre-freezing under -60- -4 deg.c for 1-48h; drying the frozen material to do multiple injections until the pore is filled with cement; obtaining the product.

The invention relates to filter paper for a cooling system in wire electrical discharge machining (WEDM), which comprises the following components in percent by weight: 18-25 percent of phenolic resin, 0.5-5 percent of glass fiber, 0.5-5 percent of polyester fiber and 65-82 percent of wood pulp fiber. A production method of the filter paper comprises the steps of pulping, pulp mixing, paper making, drying, glue setting and forming. The filter paper adopts the wood pulp fiber as the main material which is matched with a proportion of glass fiber and polyester fiber, so that the bore diameter of the filter paper can be reduced, and the filtering accuracy can be improved; and in addition, since the polyester is chemically-synthesized fiber and has high strength, the bursting strength of the filter paper is improved, and the service life of the filter paper is prolonged. In the production process of the filter paper, thermosetting phenolic resin is introduced by dipping setting glue, and the size stability, the high temperature resistance and the water resistance of the filter paper are further improved. When being applied to a cooling liquid circulating system in WEDM, the filter paper is not deformed or expanded and has good strength in water, and the phenomena of water jetting and black water generating due to bursting are avoided.

The present invention discloses a preparation method of a simple, low-cost, multi-channel microfluidic chemiluminescent paper chip and an on-site detection method by using the same. By using a full print mode, a plurality of multi-channel microfluidic chemiluminescent paper chips are printed out on a common A4-size filter paper in batch. The printing process includes: printing hydrophobic wax patterns in batch; melting wax for molding; printing chemiluminescent reagent ink patterns in batch; printing oxidase ink pattern in batch; cutting the microfluidic chemiluminescent paper chips into certain shape; and performing plastic package to the prepared microfluidic chemiluminescent paper chips. An on-site detection method by using the microfluidic chemiluminescent paper chip comprises the steps of: placing the plastic packaged microfluidic chemiluminescent paper chip into the cartridge of a handheld luminescent detector; dropwise adding a sample solution into the sample region; then covering the cartridge with a lid, and starting the test. The existence and contents of glucose, polyphenols, xanthine, cholesterol, uric acid, and hemoglobin are sequentially determined via the size of six chemiluminescence peaks sequentially appearing.

The invention provides composition comprising microcapsules containing biocides for coating material such as paint. The invention describes composition of microcapsules containing biocides, especially Irgarol (algaecide) and Zinc Pyrithione (fungicide) and coating material such as paint to increase the life of coating material from the attack of algae and fungi respectively. The invention demonstrates that microcapsules containing biocide dispersed in paint show 0 to 3% reduction in inhibition zone where as un-encapsulated biocide show 20-22% reduction in inhibition zone when analyzed by filter paper assay thus indicating extended duration of biocidal activity with microencapsulated biocide.

The invention discloses high-temperature resistant fiber filter paper for an engine oil filter and a preparation method of the high-temperature resistant fiber filter paper. The high-temperature resistant fiber filter paper comprises, by weight, 60-70 parts of coniferous wood pulp, 20-30 parts of cotton pulp, 20-30 parts of modified polyimide fiber, 2-5 parts of kaoline, 1-3 parts of lithopone, 2-4 parts of silica gel, 1-2 parts of nanometer titania, 0.5-0.8 part of ammonium polyphosphate, 1-2 parts of modified acrylic emulsion, 2-4 parts of acetic styrene-acrylic emulsion, 0.5-1 part of stearic acid monoglyceride, 0.5-1 part of silane coupling agent KH590, 0.4-0.8 part of sodium lauryl sulfate, and 2-5 parts of urea resin. The high-temperature resistant fiber filter paper prepared is good in water permeability, large in filtering area, small in maximum hole diameter, high in filtering precision, strong in bursting strength, high in temperature resistance and the like, has stable performance index under normal-temperature and high-temperature working conditions and is provided with good temperature resistance and filtering effects, and filtering efficiency of the high-temperature resistant fiber filter paper can reach 99.97%.

A filter such as an air having a reagent which chemically reacts with and removes a gaseous component of an air stream. The reagent contains functional groups covalently bonded to a non-volatile inorganic substrate which is incorporated in the filter. The filter can remove gaseous components such as aldehydes. Preferred functional groups are 3-aminopropylsilyl groups covalently bonded to silica gel (APS silica gel). The reagent can be contained in a space in the filter or incorporated in one or more filter elements. The reagent can be part of or coated on paper such as filter paper or incorporated in non-paper filter elements formed from fibrous materials such as cellulose acetate or polypropylene fibers. Other preferred reagents include aminoethylaminopropylsilyl silica gel (AEAPS) and aminoethylaminoethylaminopropylsilyl silica gel (AEAEAPS).

The invention is the method about direct reading monitor appearance of dust concentration of Beta radial, it includes fume containment cell and fume quality detection cell, the fume containment cell includes fume sample collection gun, filter paper and mechanical control auto form feed structure, thereinto ,the fume sample collection gun includes gathering tube,pitot tube and sheath tube; thereinto, fixing a up bore body on the end of collection tube of the fume sample collection gun, fixing a down bore body with up bore body corresponding, the filter paper passes in the gap of thereabout bore body, fixing the filter paper torr at the place of entrance of down bore body, fixing the flue gas exit at the bottom of bore body, thereinto, the sampling acreage of soot from the up bore body is twice with actual testing acreage of filter paper. Getting to improve the measuring accuracy for the flue gas, avoiding disturb from hydrosphere for testing soot.

The invention discloses a method for detecting multiple trace heavy metal ions through a colorimetric sensor array. The method comprises the steps of drawing specific hydrophilic channels on quantitative filter paper through a wax spray type printer, respectively fixing several heavy metal ion indicators in the respective hydrophilic channels to form an indicator array, and connecting a water absorption unit fixed with a macromolecular water absorption material to the rear end of each channel, wherein a heavy metal ion solution generates reaction with the indicators through the hydrophilic channels; furthermore, under the water absorption action of the macromolecular materials at the rear ends, the heavy metal ion solution can continuously flow through the indicators and generate enrichment reaction, so that the aim of half-quantitative measurement on contents of eight trace heavy metal ions in water can be achieved. Color imaging equipment is used for collecting color changes of the indicators in front of and behind different heavy metal ions and constructing a fingerprint of each heavy metal ion. In a test process, a mathematical statistics method is adopted; a sample atlas is compared with the fingerprints, so that unknown heavy metal ions can be qualitatively and half-quantitatively analyzed.

The invention discloses an environment-friendly efficient filter filtering paper. The environment-friendly efficient filter filtering paper is prepared by the following raw materials in part by weight: 40-50 parts of softwood pulp, 30-40 parts of waste paper pulp, 20-30 parts of high-silica glass fiber, 2-5 parts of modified vermiculite, 1-3 parts of zeolite molecular sieve, 2-4 parts of nanometer calcium, 1-2 parts of modified pulverized fuel ash, 2-3 parts of water-solubility organic silicon resin emulsion, 1-2 parts of water-solubility polytetrafluoroethylene emulsion, 0.5-0.8 parts of ammonium polyphosphate, 3-4 parts of glycerol triacetate, 0.5-1 parts of diethanolamide, 0.5-1 parts of silane coupling agent KH560, 0.4-0.8 parts of sodium dodecyl sulfate, 0.5-1 parts of antioxidant DSTP, and 4-6 parts of polyethylenimine. The filtering paper prepared by the method provided by the invention has the advantages of being good in water permeability, large in filtering area, small in maximum diameter of hole, high in filtering precision, strong in bursting strength, high-temperature-resistant, good in water resistance and the like, can achieve the filtering efficiency by 99.98%, has stable performance index at atmospheric and high-temperature working conditions, as well as better temperature resistance and filtering effects.

The invention relates to an electrolytic extraction and detection method of nonmetallic inclusion in steel by utilizing an organic solution. The method comprises the following process steps: (1) preparing electrolyte; (2) preparing and electrolyzing a steel sample: soaking the steel sample containing the inclusion into the electrolyte in an electrolytic cell; arranging a salt bath beside the electrolytic cell; erecting a salt bridge between the salt bath and the electrolytic cell; inserting a calomel electrode into the salt bath; inserting a calomel electrode in the salt bath; using the positive electrode of the steel sample, connected with a direct current stabilized power supply, as the anode, using a platinum wire as an electrolysis cathode, charging inert gas, particularly referring to argon; and (3) separating: pouring the electrolyte left after the electrolysis of the steel sample in the step (2) into a funnel which is filled with filter paper; arranging a vacuum filtration device which is loaded with a polytetrafluoroethylene membrane at the position tightly attached to the liquid down port of the funnel; separating the inclusion from the steel sample under the state that the vacuum filtration device is vacuumized; and transferring the polytetrafluoroethylene membrane which is distributed with the inclusion to a scanning electron microscope for detection. In the method provided by the invention, the inclusion can be extracted out of the steel without being damaged; and the three-dimensional shape of the inclusion is directly observed.

The invention provides large-area freestanding carbon nanotube paper and a preparation method thereof. The carbon nanotube paper is composed of disordered carbon nanotubes and in a non-woven fabric form. The preparation method comprises the steps of: dissolving carbon nanotube powder in a solvent, dispersing it uniformly and placing the dispersion solution in a pumping filtration device, conducting pumping filtration to deposit the carbon nanotube on filter paper, then separating the carbon nanotube paper and the filter paper, thus obtaining a target product with thickness ranging from micrometers to hundreds of micrometers. The method of the invention is not limited to a specific carbon nanotube kind, pumping filtration device and dispersion degree, and can be realized by ordinary filtering equipment and dispersion equipment. With an area more than 50cm<2>, the prepared carbon nanotube paper has the advantages of freestanding capability, low content and easy removal of a dispersing agent, controllable flexibility and poriness, simple operation technology, and low cost, thus being applicable extensively in the fields of new energy, heat radiation of high power electronics, advanced chemistry, chemical and biological separation, filtering membranes and high performance light polymer composite materials.

The invention relates to a direct graphene film transfer method. Currently, transferring graphene films from metal surfaces is quite inconvenient. The method includes: using the chemical vapor deposition method to grow a graphene film on a copper foil; using oxygen plasma cleaner to clear graphene on one side of the copper foil to obtain a combination of the single-layer graphene film with the copper foil; flatly attaching a transfer carrier onto the surface of the graphene film and drip adding an organic solvent of a proper quality to increase the interaction between the transfer carrier andthe graphene film; using etchant solution to clear the copper foil to obtain a combination of the single-layer graphene film with the transfer carrier; using deionized water to clean the graphene film for multiple times; and using a filter paper to clear the deionized water on the surface of the graphene film. Using the direct graphene film transfer method avoids the graphene films from being damaged by transfer media such as organic colloid and the like, single-layer graphene films of 100 micrometers or more can be obtained, simple equipment is required, product dimension is controllable, production safety is high, and industrial application is easy to implement.