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785results about How to "Uniform diameter" patented technology

Device and process for mass production of nanometer fiber by melt electro-spinning method

The invention relates to a device and a process for mass production of nanometer fiber by a melt electro-spinning method, belonging to the field of electro-spinning. The device mainly comprises a base fabric unwinding device, a conveyor belt device, a high-voltage electrode net, a spinning die head assembly, a melt body metering pump, a static removal roller, base fabric, a base fabric winding device, a hot wind return path, an electrode net insulation support, a melt body transmission device, a high-voltage static generator and an air heating system, wherein by the application of a primary division runner in the spinning die head assembly, primary division and accurate partition temperature control of a melt body can be realized; with the creation of a nozzle on an airflow-assisted inner conical face and the assistance of high-speed hot air, secondary division thinning of a melt body layer is realized; by the whole device and the corresponding process, the problems of thick fiber and low yield of the traditional melt body spinning device and process are solved, the device and the process can substitute a melt blowing method to be the main production device and process for production of non-woven materials, and a new path is provided for the production of hundred-nanometer fiber products.
Owner:BEIJING UNIV OF CHEM TECH

Polypropylene open-cell foaming material and preparing process thereof

The invention relates to a polypropylene foaming material for opening aperture and a preparation method thereof, which pertains to the polymeric material field and aims at solving the disadvantages of the existing foaming material for opening aperture of high technological cost, difficulty in recovery, environmental pollution and complicated operation. The foaming material of the invention consists essentially of polypropylene resin composition, and the composition consists of polypropylene A with a melt flow velocity of 0.01 to 10g/10min, polyethylene B with an Mw of 600,000 to 5,000,000, a compatilizer C and a normal additive; the additive accounts for no more than 10 weight percent, and B accounts for 1 to 40 weight percent while C accounts for 0 to 5 weight percent in the mixture of A, B and C. The composition is heated over the molten temperature thereof in the invention, a physical foaming agent with 1 to 20 percent of the melt in weight is injected under the pressure larger than the pressure of the melt, then the mixture is exposed under the environment with a pressure lower than the pressure of the composition melt, thus the polypropylene foaming material for opening aperture is prepared. The invention has the advantages of low cost, simple operation, no pollution, uniform and unblocked foam pores, and the opening percentage of at least 50 percent.
Owner:BEIJING UNIV OF CHEM TECH +1

Microbubble generating device and hair washing device utilizing the same

InactiveUS20070108640A1Uniform bubble diameterUniform diameterFlow mixersMixing methodsExhaust valveMicrobubbles
A dissolving water making unit and a bubble generating unit are provided. The dissolving water making unit includes a gas dissolving device for dissolving gas in water. The bubble generating unit includes a bubble generating nozzle and a bubble generating cartridge. The dissolving water making unit sucks water from a water source, and sucks gas to make dissolving water from a mixed solution in which the water and the gas are mixed together. The dissolving water is obtained by dissolving the gas in the water. The bubble generating unit generates microbubbles from the dissolving water supplied from the dissolving water making unit. The gas dissolving device includes a closed vessel; an inflow port which is provided in the closed vessel, and which is provided for causing the mixed liquid sucked from the source to flow into the closed vessel; an exhaust valve which is provided in an upper portion of the closed vessel, and which is provided for exhausting excess gas from the mixed liquid; and an outflow port which is provided near a bottom portion of the closed vessel, and which is provided for causing the dissolving water to flow out from the closed vessel to the bubble generating unit. Between the inflow port and the outflow port, the closed vessel has a retention region in which the dissolving water flows slowly, in which air is dissolved in the dissolving water to substantial saturation, and in which the dissolving water hardly contains fine bubbles. A hair washing device includes a hair washing bowl having an opening portion in which a head region can be accepted. The bubble generating unit is attached to a lower portion of the hair washing bowl. In an upper portion of the hair washing bowl, an exhaust port for exhausting water from the hair washing bowl is provided.
Owner:SHIGEN KAIHATSU

Controllable preparation method of monocrystal copper nanowires

The invention relates to a preparation method of copper nanowires and in particular relates to a controllable preparation method of high-yield monocrystal copper nanowires in a liquid-phase reduction manner. The controllable preparation method comprises the steps: firstly, mixing a divalent metal copper salt solution and ethylenediamine, and heating in a water bath to form a single and stable copper ion chelate compound; mixing a strong base solution with hydrazine hydrate, and preparing a reducing agent in the water bath at the same temperature; then transferring the two mixture solutions into a reaction vessel, fully stirring to reach a uniform state, covering well, and placing in the water bath at the same temperature for heating reaction to prepare the copper nanowires; and fishing out flaky copper nanowires floating on the upper layer of the solution, washing the flaky copper nanowires with deionized water and absolute ethyl alcohol in sequence three times, and drying at room temperature under an Ar gas protection condition to prepare the copper nanowires. The controllable preparation method provided by the invention has the advantages of simple process, low cost and high yield, and the prepared copper nanowires are of monocrystal structures, and have relatively smooth surfaces, uniform radial thickness, and controllable and more uniform length and diameter.
Owner:CHANGZHOU UNIV
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