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2213results about How to "Small aperture" patented technology

Method for preparing polymer microporous foaming material by supercritical mould foaming

The invention provides a method for preparing a polymer microporous foaming material by supercritical mould foaming. The method comprises the following steps of: heating a foaming mould on a mould press to the foaming temperature; placing a polymer into the mould; closing the mould by using the mould press; sealing the mould; introducing supercritical fluid, which swells and diffuses to the polymer, into the mould; and opening the mould by using the mould press to release pressure and foam to obtain the polymer microporous foaming material. Compared with the prior art, the method has the advantages that: the high-temperature and high-pressure supercritical fluid is used for swelling the polymer, so the moulding cycle is greatly shortened; the limit that only microporous foaming sheet material with lesser thickness can be manufactured in the prior art is broken through, so a polymer microporous foaming plate with greater thickness can be manufactured; when the mould is opened, the pressure-releasing speed is high and the foaming pore core-forming speed is high, so the formed microporous foaming material has smaller foaming pores, higher pore density and more excellent performance; and multiple layers of moulds can be placed on one mould press, so the method is suitable for industrialized scale production.
Owner:常州福源科技新材料有限公司

Vehicle license plate imaging and reading system for day and night

ActiveUS7016518B2Avoid sensor overload headlightAvoid reflected glareOptical rangefindersRoad vehicles traffic controlLicense numberInfrared
This invention provides an infrared illuminator and camera system for imaging of auto vehicle license plates. The system works in ambient light conditions, ranging from bright sunlight, to dim light, to dark, to zero ambient light. It yields high-contrast imaging of the letters and numbers on retro-reflective license plates. The images of the license letter and number combinations can be read manually by a remote operator. They can be converted to text format with optical character recognition computer hardware and software. The text data can then be compared to data files listing license numbers to provide further data about the owner of a licensed vehicle. A decision can be made quickly about whether to allow a vehicle to proceed through a gate, or whether to take other action. The system uses a mono camera that is enhanced for infrared sensitivity and combined with a high power infrared illuminator to maximize range at night, and with shutter speeds set up to capture clear license plate pictures even with fast moving vehicles and even with their headlights on and interfering with human observation of the license plates. Optical filtering to pass infrared in the range of the illuminator and to reduce light outside this range, combines with a lens set up, to avoid vertical smear and sensor overload caused by headlights at night and by highlight reflected glare from the sun in daytime.
Owner:EXTREME CCTV

Electrospinning nano-fiber electret filtering material and its preparation method

ActiveCN104289042AHigh surface electrostatic potentialHigh super strong electrostatic adsorption performanceSynthetic resin layered productsFiltration separationPorosityFiber
The invention relates to an electrospinning nano-fiber electret filtering material and its preparation method. The high-efficiency and low-resistsance nano-fiber electret filtering material having no interfibrous adhesion and having a fluffy three-dimensional netted intercommunication structure is prepared through controlling the component and the temperatures of a polymer solution in an electrospinning process and carrying out one-step forming in the nano-fiber forming rapid cooling process, wherein the gram weight of the above nanofiber layer is 0.01-70g/m<2>, and the porosity is not less than 80%. The surface electrostatic potential of the nano-fiber electret filtering material is 800-6000V, and the surface charges have lasting storage stability, the hydrophobic angle is greater than 150DEG, the filtering efficiency of the material to particles of 0.006-1[mu]m can reach above 99.999%, the piezoresistance is less than 20Pa, and the dust containing capacity is 300-3600g/m<2>. The preparation method is simple, and the filtering material has wide application prospects in the fields of individual protection mouth mask filtration, indoor air purification and filtration, and high efficiency/ultrahigh efficiency air filtration.
Owner:DONGHUA UNIV

Preparation and application of lithium battery silicon-carbon composite material taking synthetic graphite as carrier

ActiveCN103346305AImprove integrity and compactnessSmall apertureCell electrodesCarbon sourceCarbon composites
The invention provides preparation and application of a lithium battery silicon-carbon composite material taking synthetic graphite as a carrier. The preparation method comprises the following steps of: dissolving nanometer silicon and synthetic graphite in a dispersant to obtain a uniform dispersion liquid, adding an organic carbon source, stirring uniformly to obtain a mixed liquid, feeding the mixed liquid into a closed circulation spray dryer to prepare composite precursor powder, pre-sintering for 3-10 hours at the temperature of 300-700 DEG C to obtain a silicon-carbon composite material subjected to primary carbon cladding; and further dissolving the silicon-carbon composite material subjected to primary carbon cladding with the organic carbon source in a dispersant, stirring to obtain a uniform mixed liquid, feeding the uniform mixed liquid into a second closed circulation spray dryer to prepare composite powder, and heating the powder for 6-18 hours at the temperature of 700-1000 DEG C, so as to obtain the lithium battery silicon-carbon composite material taking synthetic graphite as a carrier. The lithium battery silicon-carbon composite material prepared by the invention shows such excellent electrochemical properties as high first charge-discharge efficiency, high specific capacity and good cycle performance after being applied to a lithium battery.
Owner:中国有色桂林矿产地质研究院有限公司
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