46results about How to "Improves strength uniformity" patented technology

The invention aims to provide polytetrafluoroethylene chopped fiber with high intensity, high uniformity and low production cost and preparation technology thereof. A process flow comprises the following steps of: mixing polytetrafluoroethylene micro powder and a lubricating agent; stirring; standing; performing pre-compression molding; performing push molding; performing rolling molding; drying; performing hot stretching; parting off; twisting; performing primary hot drawing; performing secondary hot drawing; curling and thermally forming; cutting off; loosening; and inspecting and packaging so as to obtain high-intensity polytetrafluoroethylene chopped fiber. In a manufacturing process, the temperature rises gradually from the primary hot stretching to the secondary hot stretching to the curling and thermally forming.

A sheet manufacturing apparatus includes a mixing unit that mixes fibers and a composite in the atmosphere, a forming unit that deposits and heats a mixture mixed by the mixing unit to form a sheet; in which the composite is resin particles with at least a portion of a surface coated by inorganic fine particles, and an absolute value of an average charging amount of the composite is 40 μC/g or higher.

The invention discloses a thermoshrinkable polyester film and a preparation method thereof. The preparation method comprises steps as follows: various polyester raw materials subjected to dust removal respectively enter storage bins, are respectively metered by an agravic weigher according to the proportion, simultaneously enter an inlet of a double screw extruder, are subjected to melt extrusion by a sandwich layer double screw extruder and two surface layer double screw extruders, and form a casting piece through a three-layer co-extrusion die head; the casting piece is respectively subjected to longitudinal stretching and lateral stretching, wherein the longitudinal stretching comprises a preheating zone, a stretching zone, a thermal setting zone and a cooling zone, and the thermal setting zone of the lateral stretching is more than 15m long; and the casting piece is subjected to traction rolling to obtain the thermoshrinkable polyester film. By adopting the proportioning mode of directly feeding after accurate metering by people, the instantaneous addition error range of various materials is at most 1%; and the material is biaxially stretched, so that the produced film has the advantages of greatly higher density, strength and uniformity, lower longitudinal shrinkage and lateral low-temperature shrinkage, and especially higher ductility and thermoshrinkable uniformity.

The invention relates to the manufacturing field of pianos, and specifically relates to a manufacturing method and a manufacturing system of a piano soundboard. The manufacturing method of the piano soundboard comprises the following steps of: manufacturing a core board, wherein the core board is rectangular, drying core board wood, cutting the core board wood into core board battens according to predetermined width, connecting a plurality of core board battens in by finger joint, thickening the connected core board battens, bonding and splicing the side edges of the plurality of thickened core board battens to obtain a core board manufacturing panel, chopping panel wood into veneers according to the predetermined thickness, drying the veneers, bonding and splicing the side edges of a plurality of veneers according to the condition that an angle between the texture direction and the long edges of the soundboard is 40-50 DEG to obtain panels, and respectively bonding two panels with the upper surface of the core board and the lower surface of the core board to obtain the soundboard. The manufacturing method and the manufacturing system of the piano soundboard, provided by the invention, are capable of solving the problem that the soundboard is capable of cracking since the external moisture change of the soundboard has the possibility of causing air shrinkage and wet expansion.

A lighting device comprising a light source (10), and a light guide (20) having an incident surface (20a) for receiving a light emitted from the light source (10) and an output surface (20c) for outputting a light entered via the incident surface (20a). The light guide (20) has a polarization selection layer (22) for selectively outputting via the output surface (20c) a light in a specific polarization direction (first polarization) out of lights incident via the incident surface (20a), and a polarization conversion layer (24) for converting a second polarization different in polarization direction than the first polarization into the first polarization. The polarization selection layer (22) substantially reflects the first polarization toward the output surface (20c) side only.

The invention provides a cutting-resistant ultrahigh molecular weight polyethylene fiber and a preparation method and use thereof. The cutting-resistant ultrahigh molecular weight polyethylene fibers comprise ultrahigh molecular weight polyethylene fibers, and hard fibers and hard fiber slag dispersed in the ultrahigh molecular weight polyethylene fibers, and a mass ratio of the ultrahigh molecular weight polyethylene fibers, the hard fibers to the hard fiber slag is 100: (3-6): (0.001-0.18). Compared with the existing polyethylene fiber, the cutting-resistant ultrahigh molecular weight polyethylene fiber satisfies the cutting performance EN388 five level standards. Through use of the hard fiber slag, the hard fibers are uniformly dispersed in the ultrahigh molecular weight polyethylene so that the finished product fiber has high strength uniformity and high friction resistance.

The invention discloses a heat treatment process for rapid aging of a large-size GH4738 alloy forge piece, and belongs to the technical field of heat treatment of nickel-based high-temperature alloy. The process comprises the steps of firstly, carrying out solution treatment on the large-size GH4738 alloy forge piece, and carrying out cooling in a mode that the large-size GH4738 alloy forge piece is cooled in a furnace at first and then is cooled in air; and then carrying out aging treatment on the large-size GH4738 alloy forge piece in a heating furnace under the conditions that the aging treatment temperature ranges from 740 DEG C to 760 DEG C and the heat preservation time ranges from 4 h to 8 h, and cooling the large-size GH4738 alloy forge piece in air after the large-size GH4738 alloy forge piece is taken out. According to the heat treatment process, by optimizing the cooling speed of alloy obtained after solution treatment and cooperating with short-time aging treatment, a dispersed and evenly-distributed gamma' phase is promoted to be formed in a GH4738 alloy matrix. The treatment process has an unexpected effect on improving the strength uniformity of the alloy forge piece at the room temperature. The tensile strength difference corresponding to the edge and the core area of the forge piece at the room temperature is reduced to be within 15 MPa from about 40 MPa, and the yield strength difference is reduced to be within 15 MPa from about 50 MPa. Meanwhile, compared with traditional aging treatment, the heat treatment process has the advantages that the aging treatment time is greatly shortened, the production efficiency is improved, the production cost is reduced and important production and application value is achieved.

The invention provides a pulpy metakaolin-base concrete admixture and a preparation method of the admixture. The admixture comprises a dry base, a composite dispersant and water, wherein the dry base consists of 30-90% by mass percentage of metakaolin and 10-70% by mass percentage of fly ash sinking beads; a mass ratio of the water to the dry base is (30-180):100; the composite dispersant consists of hydroxyethyl cellulose and a naphthalene water reducing agent; the hydroxyethyl cellulose accounts for 0.005-2.0% of the mass of the dry base; the naphthalene water reducing agent accounts for 0.001-1.0% of the mass of the dry base. The admixture reduces an adverse effect of the metakaolin on the working performance of concrete by utilizing combined action of the metakaolin, the fly ash sinking beads and the dispersant, and significantly improves the strength uniformity, the dispersity and the stability of a test block.

The invention discloses a negative electron affinity cold cathode X-ray tube. The negative electron affinity cold cathode X-ray tube is characterized in that the cold cathode consists of an electrical emission type negative electron affinity cold cathode, wherein the cold cathode material contains a P-N knot, and can be used for generating vacuum electron emission without additionally arranging a light source; an X-ray tube target material is positioned in a tube anode; the cold cathode and the anode target material are in sealed connection through cold indium, and the vacuum degree of the whole tube is E-8Pa. The negative electron affinity cold cathode X-ray tube has the advantages that the defect that a conventional photoelectric cathode X-ray source needs an external light source is solved, the X-ray tube is compact in structure, convenient to use and stable in beam. Compared with a field emission cathode X-ray tube, the X-ray tube cold cathode is a large-area semiconductor epitaxial wafer without a plurality of micro tips of the field cathode, and therefore, the X-ray is high in resolution and good in uniformity. The negative electron affinity cold cathode X-ray tube is suitable for all semiconductor materials, surfaces of which can form negative electrode affinity, suitable for GaAs, and also suitable for various photoelectric cathode materials of GaAsP, InGaAs, AlGaN and GaN.

The invention discloses a fiber heat treatment device. The fiber heat treatment device comprises a reaction kettle body, a center shaft, a tow bearing device and a gas spraying device are arranged inthe reaction kettle body, wherein the tow bearing device is arranged on the center shaft and used for containing package fibers, and the central shaft is connected with an external driving mechanism.The invention further provides a fiber heat treatment system and a heat treatment method. According to the heat treatment reaction device, the whole roll of package fibers are placed on the tow bearing device, the space utilization rate of the heat treatment reaction device is increased, the heat treatment yield and the heat treatment efficiency are improved, and industrialization of fiber heat treatment is conveniently achieved; and meanwhile, the driving mechanism drives the center shaft to rotate so as to drive the whole roll of package fibers to rotate in the heat treatment process, the gas spraying device inputs inert gas into the heat treatment reaction device, the package fibers make full contact with the inert gas atmosphere, and small molecules separated out of the surfaces of thefibers due to the heat treatment reaction are blown away and brought away, so that heat treatment efficiency is improved.

A micro-optical component for generating an image, including a substrate and a lens. The substrate, includes a first surface and a second surface, wherein the first surface includes an aperture, and the second surface is arranged to be connected to a pixel array. The lens is placed on the first surface so as to cover the aperture. The focal point of the lens belongs to the second surface. The lens includes an obscuration element generating at the lens an obscured area and an unobscured area. The obscuration element is dimensioned to reduce the light transmittance towards the pixels for a fraction of the viewing angles only and at the same time. The obscured area is dimensioned so that the optical resolution of the lines is not smaller than the image resolution given by the size of the pixels.

The invention discloses a rotor spinning false twister. Narrow slits penetrating a cambered surface are formed in the cambered surface of a false twister body and connected with external fans, and air exhaust functions are achieved. When yarns are spun in a rotor spinning manner, the yarns can be adsorbed on the narrow slits by external negative pressure, friction action among the spun yarns and the cambered surface of the false twister body can be increased, so that false twisting action of the false twister is enhanced, and end breakage is decreased when the yarns are spun in the rotor spinning manner. The rotor spinning false twister can effectively solve the problem of end breakage in rotor spinning of combed noil yarns below 14.7tex, and can help enterprises to effectively upgrade industries and save production cost.

The invention discloses a high-strength and high-conductivity aluminum rod material and a production method. The aluminum rod material comprises the following alloy components in percentage by weight:0.16-0.19% of iron, 0.03-0.45% of silicon, 0.02-0.05% of boron, 0.02-0.2% of lanthanum, less than 0.01% of manganese chrome vanadium titanium, and the balance of aluminum, wherein the ratio of iron to silicon is controlled to 3.5-6. According to the produced high-strength and high-conductivity aluminum rod material, the main performance indexes meet the requirements of GB/T3954, namely, the tensile strength is 140 MPa or higher, the conductivity is 62.5% IACS, and the single-coil aluminum bar strength deviation is 4 MPa; the tensile strength of a large-section conductor aluminum wire producedthrough the aluminum bar is not less than 180 MPa, and the tensile strength difference is not greater than 20 MPa, the conductivity is 62.5% IACS; unnecessary energy consumption in an ultrahigh voltage power transmission process is eliminated.

The invention discloses a forming device of a hole net steel skeleton reinforced composite pipe. The forming device comprises a machine base, a forming inner mold and a forming outer mold, wherein theforming inner mold and the forming outer mold are arranged on the machine base; the forming outer mold is arranged on the periphery of the forming inner mold in a concentrically sleeving manner, a forming channel allowing a hole net steel skeleton to penetrate through and plastic fluid to penetrate through is formed between the forming inner mold and the forming outer mold, the forming inner moldis provided with a shaping segment, and correspondingly, a positioning and shaping mechanism used for positioning and shaping the hole net steel skeleton is arranged at the position, corresponding tothe shaping segment, of the machine base. According to the forming device, in the forming process, the hole net steel skeleton is shaped, and the forming quality of the composite pipe is improved.