125results about How to "Increase surface contact area" patented technology

Disclosed is an improved extruder head for a fused filament fabrication 3D printer. It would be beneficial with a thinner nozzle diameter and higher extrusion speed without slippage in the feeding mechanism. The proposed improved extruder head enables extrusion of thinner extruded material at a higher extrusion speed without any slippage in filament feeding mechanism, thereby allowing higher overall building speed of the 3D printer with high quality build. Higher feed-rate of the filament material is achieved by increased usable friction between pinch wheel and filament by increasing the grippable area of the filament. This is done by feeding the filament into the feeding mechanism at an angle different to the outlet angle and routing it around the pinch wheel, back supported by a plurality of support rollers, so that the filament is in frictional contact with the pinch wheel along a greater part of its circumference, thereby increasing the surface contact area between the pinch wheel and the filament. Owing to non-slippage of the filament feeder, nominal volume of extruded material is exactly the same as desired volume with high filament feeding rate. Due to compact feeding mechanism, total mass of extruder kept small enough to enable higher acceleration of the printing nozzle resulting higher printing speed. Owing to horizontal loading of the filament material, feed roll can be mounted just above the extruder for smooth filament supply and compact size of 3D printer.

A catheter configured for delivering an agent to a patient's vessel wall, having self-expanding frame, and a method of delivering an agent to a patient's vessel wall. A first catheter has an elongated shaft with an agent delivery lumen and self-expanding frame on a distal shaft section formed of plurality of hollow tubes having joined first ends and free second ends, the free end of each hollow tube having an agent delivery port in fluid communication with the shaft agent delivery lumen and having a hooked tip configured for penetrating the vessel wall in the expanded configuration. Another catheter has a frame around the outer surface of a lining member such as a balloon or a tubular sleeve, such that the frame expanded against the vessel wall and the lining member together define a plurality of pockets between the vessel wall and the outer surface of the lining member.

A drive line for a down hole mud motor has a plurality of elongate keys extending radially from an exterior surface of a central shaft for the purpose of transmitting torque. A plurality of circumferentially spaced axial keyways are provided in an interior surface of each end housing, which are adapted to receive the keys. Each of the keys has opposed sides, opposed ends and a front face. The front face is radiused both in a first direction between the opposed ends and in a second direction between the opposed sides, thereby accommodating the omni-directional pivotal movement of the shaft relative to the housing. The use of keys for torque transmission increases available contact area, with a corresponding increase in torque load capacity.

A method of assembling electronic components using a dispenser having a nozzle in fluid communication with a source of viscous liquid having a high surface tension and having an air discharge passage in fluid communication with a source of pressurized air. A droplet of the viscous liquid is dispensed from the nozzle onto a printed circuit board to form an initial contact area between the droplet and the printed circuit board and the high surface tension of the droplet causes the initial contact area to remain substantially constant. A burst of air is then discharged from the air discharge passage for impinging the droplet after the droplet contacts the printed circuit board, which increases the initial contact area between the droplet and the printed circuit board.

A dialysis fluid cassette includes a rigid portion defining first and second valve chambers, the rigid portion further defining an air separation chamber in fluid communication with the first and second valve chambers, the air separation chamber including a baffle and structured such that when the cassette is placed in a dialysis instrument, (i) the baffle extends upwardly from a bottom of the air separation chamber and (ii) first and second openings to the air separation chamber, communicating fluidly and respectively with the first and second valve chambers, are located near the bottom of the air separation chamber, such that the dialysis fluid is forced up one side of the baffle and down the other side of the baffle when flowing through the air separation chamber.

The bentonite composition modified asphalt consists of asphalt in 94-98 portions, bentonite in 1-3 portions and powdered styrene-butadiene rubber in 1-3 portions. The bentonite is at least one of calcium base bentonite, sodium bentonite and organic bentonite. The preparation process of the bentonite composition modified asphalt includes the following steps: eliminating sand in bentonite, drying, grinding and 325-mesh sieving bentonite; adding bentonite into the asphalt matrix; and adding powdered styrene-butadiene rubber while slowly stirring to mix homogeneously. The modified asphalt has the features of high temperature stability, low temperature cracking resistance, excellent anti-ageing performance, low cost, etc.

A hinge device for a flat panel display which is able to be adjusted and retained at any desired angle, comprises a fixed unit and a pivotal unit, wherein the fixed unit has a base, a pair of supports, a pair spindles and a pair of bushings mounted around the spindle, the pivotal unit includes a mounting part integrated with two pivotal bearing parts, two pair of bearing blocks respectively mounted around the bushings and a connecting member, a plurality of annular grooves being defined around an aperture defined in a center of the bearing blocks corresponding to the plurality of the annular ribs formed around the external surface of the bushing, thereby the pivotal unit is able to be retained at any desired angle by the friction between the contacting surfaces of the bearing blocks and the bushing.

An improved exhaust system and catalytic converter element for a diesel engine wherein the improvement comprises: holding means for restricting the movement of catalytic converter elements in an overhead exhaust manifold; an improved catalytic converter element having at least one retaining rod extending through the catalyst substrate and / or having at least one retaining lip projecting into the substrate; a stabilizer projecting from the cover for the element insertion slot for receiving an end portion of the catalytic converter element to restrict the movement of the converter element in the exhaust manifold; perforated flow distribution elements provided upstream of the catalytic converter elements; and / or vertical coupling manifolds which each receive exhaust from a pair of engine cylinders and then deliver the combined exhaust stream to a separate one of the inlet openings in the bottom of the overhead exhaust manifold.

The intramedullary nail has a longitudinal axis (5), a near end (1) with means (8) for coupling to an insertion device and a far end (2) with a tip (7) for insertion into the intramedullary canal of a long bone. The far end (2) is provided with at least two traversing through holes (3) with axes (6), all of said through holes (3) being grouped in said far end (2) within a distance x measured from said tip (7) to the axis (6) of the most distant hole (3). The nail is provided with at least a third through hole (3) with axis (6) in said far end (2) which contains the first and second holes (3) and the projection of the hole axis (6) of said through holes (3) in a plane orthogonal to said longitudinal axis (5) is such that at least two of said projected hole axis (6) are at an angle α greater than zero and less than 90° with respect to each other.

Injection molding machine utilizes microwave heating. A microwave oven adapted to receive a microwave absorbent plasticizing vessel is utilized with or incorporated into an injection molding system to form a plasticizing unit for heating polymer granules to an injection temperature and injection of the melt into the cavity of the injection mold. The polymer granules may be preheated by conventional heating systems to a temperature at which the granules become microwave absorbent before heating to the injection temperature in the microwave oven. The injection molding machine also contains a hydraulic actuator for injection of the melt. The ceramic materials forming the plasticizing vessel are selected to provide equal heating rates of mold members and relatively uniform heating of polymer to desired injection temperature.

A bracket and a cable mounting system which includes a bracket with at least two legs, which is angled to match the radius of a structure to which the bracket is to be applied. The bracket has at least one hole in the center panel for securing a component to the bracket. The bracket can have magnetic pads located on the distal end of the legs so that the bracket may be attached to a structure by magnetic force. The cable mounting system may also consist of two brackets a distance apart and a support rail placed in between the brackets and coupled to the brackets.

The invention provides a preparation method of a porous implant filled with O-intersecting lines units. The preparation method comprises the following steps: drawing a three-dimensional model of the O-intersecting lines units, controlling the bore diameter, wall thickness and porosity of the three-dimensional model according to the given specific dimension so as to generate a unit structure cell body, carrying out array copying operation on the unit structure cell body, thus obtaining a space porous network body, introducing in a femoral three-dimensional surface model, scaling the model to reach the proportion actually needed, carrying out cutting and Boolean operation on the porous network body and the femoral three-dimensional surface, thus obtaining a porous main body part, drawing the femoral steam end and a bolt positioning hole part by utilizing three-dimensional modeling, combing the porous main body part to enable the porous main body part to form a single-output porous implant body, saving the single-output porous implant body into an output format file and transmitting the file to layering software, adding with a bottom surface support, printing the porous implant body by adopting a 3D printer, clearing a substrate plate, taking out the porous implant, carrying out sand blasting treatment on the porous implant, and packaging the porous implant. With the adoption of the preparation method, units which are regular and uniform and having no closure can be generated, and the stressing uniformity is guaranteed.

A concrete finishing apparatus and method for smoothing and flattening partially set-up concrete to a close-tolerance surface includes a movable unit that is movable and supported at a partially set-up concrete surface and at least one rotatable ring finishing member mounted to the movable unit. The rotatable ring finishing member is positioned at the concrete surface and rotatable to engage and finish the surface of the partially set-up concrete to a higher quality, closer-tolerance flat and level concrete floor surface. The apparatus may include a pair of rotatable ring finishing members that may be rotatable in opposite directions to enhance the floating and finishing processes and to transport any cement paste, sand, small aggregate, or concrete mix residue forward with the rotatable ring finishing members working surfaces to cut high areas and fill in any low areas as the concrete finishing apparatus moves over the partially set-up concrete.

The invention relates to a process for treating malodorous gases in sludge. The process comprises the following steps that: due to adoption of two-stage absorption manners in two absorption towers, gas passes through a first-stage absorption tower at first so as to enable alkaline waste gas, reductive waste gas and solid impurities in gas to be eliminated by using acid absorption liquid; then, gas passes through a second-stage absorption tower so as to enable residual little chlorine and acidic substances in gas to be absorbed by alkali absorption liquid; and finally, absorbed and purified gas is discharged through an exhaust pipe on the top of the second-stage absorption tower in a standard reaching manner. The process for treating malodorous gases in sludge disclosed by the invention is capable of effectively treating malodorous gases emitted from sludge, therefore, secondary pollution of waste gas to air is reduced; the living environment of people is greatly improved; and health of people gets a certain guarantee.

A railroad car coupling system including a draft sill with front and rear stops, a coupler along with an energy management assembly for receiving and dissipating external forces experienced by the coupler. A yoke also forms part of the coupling system and is operably coupled to the coupler. The yoke includes top and bottom walls which each include two forward facing stops. A follower is mounted substantially between the top and bottom walls of the yoke for receiving forces experienced by the coupler. The follower is configured with two laterally spaced vertical extensions disposed toward opposed upper corners of the follower and two laterally spaced vertical extensions disposed toward opposed lower corners of the follower. Forward facing surfaces on the follower extensions arc arranged in generally coplanar relationship relative to each other. Rearward facing surfaces on the follower extensions are arranged in generally coplanar relationship with each other and operably engage with the forward facing stops on the yoke to enhance the distribution of forces when the follower engages the front stops on the center sill when the coupling system is in a full draft condition.

The invention discloses a method for treating laterite-nickel ore. The method comprises the following steps of: (1) pretreating the laterite-nickel ore to obtain laterite-nickel ore particles; (2) mixing the laterite-nickel ore particles with a reducing agent to obtain a mixed material; (3) pre-reducing the mixed material to obtain roasted ore; (4) smelting the roasted ore, sulfide ore, a smeltingsolvent, combustible and oxygen-enriched air to obtain first low-nickel matte and smelting slag; and (5) blowing and slagging the first low-nickel matte and a blowing solvent to obtain high-nickel matte and blowing slag. The method is high in efficiency, low in energy consumption and high in metal recovery rate when used for treating the laterite-nickel ore.

The invention provides a preparation method of super-wear-resistant and high-toughness artificial hip joint with biological activity. The preparation method comprises six steps of preparation of a steel mold, preparation of an artificial hip joint germule, formation of a pore, filling of the pore with a PLLA / nHA compound, spraying of a PGA / nHA composite coating layer and surface degradation treatment. A composite material of polyether-ether-ketone and hydroxyapatite whiskers is used as a stent material; the pore is formed in a position corresponding to the stent material, and is filled with the degradable PLLA / nHA active composite material; then the PGA / nHA composite coating layer is sprayed; after the surface degradation treatment is performed, the super-wear-resistant and high-toughnessartificial hip joint with biological activity is obtained. The artificial hip joint prepared through the preparation method is combined with bones via the self-healing effect of bone induced cells onthe bones, and is higher in mechanical property, biological compatibility and bone combination strength than a conventional product.

A porous implant filled with O-intersecting lines units is mainly oriented to femoral stems and comprises a femoral stem end, a porous main body part and a screw positioning hole part, wherein the femoral stem end is used for positioning the porous implant, the screw positioning hole part is used for fixing the implant and a host, the porous main body part is a three-dimensional through porous network entity mainly formed by being filled with the O-intersecting lines units, the porous network entity comprises hollowed-out entities formed by scanning of O-intersecting lines unit cylinders penetrating through and crossing with one another in space, the hollowed-out entities are formed by pairwise perpendicular and linearly stacked O-intersecting lines unit cylinder surfaces, and the porous network entity has the pore diameter ranging from 400 mu m to 1,000 mu m, the unit wall thickness ranging from 80 mu m to 120 mu m and the porosity ranging from 55% to 85%. Thus, a porous network structure formed by stacking of the hollowed-out entities is close to a bone structure, has the high porosity, the high communication ratio and the larger surface contact area, is suitable for new bone ingrowth and circulation of nutrition tissue liquids and has the considerable clinical medical prospect.

The invention discloses a microorganism immobilized carrier and a preparation method thereof. The immobilized carrier is a helical tube, which is formed by superposing a stainless steel mesh and a nylon mesh and then winding same. A magnetic polyvinylalcohol thin-film layer is covered outside the stainless steel mesh and the nylon mesh. The preparation method for the microorganism immobilized carrier comprises the following steps: preparing the magnetic polyvinylalcohol thin-film layer; modifying and activating the magnetic polyvinylalcohol thin-film layer; preparing the helical tube structure; and immobilizing a microorganism. The microorganism immobilized carrier has the advantages of large surface contact area, multiple absorbed microorganisms, magnetism, simple operation, reduction of production and operation steps, reduction of cost, strong adsorbability, and strong activity and reliability of the carrier, thereby achieving the recycling aim. The occupancy space is reduced; the product yield is improved; and the mass transfer effect cannot be influenced simultaneously.

A fabric for use in dynamic condensation drying apparatus comprises a single fabric comprising at least a core layer (22) of relatively large structure and large void size, and a paper support layer (21) of relatively fine structure and pore size, and optionally a cylinder side layer (23) of intermediate structure and pore size. A range of alternatives are shown, including the use of fibrous batts, woven fabrics, perforated membranes, sintered layers, chain-link fabrics, and honeycomb layers, as well as unitary woven or sintered fabrics incorporating the layers in a single structure.

A proto-microcarrier for arthrodial cartilage is prepared from fresh joint cartilage through freeze drying, pulverizing, sieving adding trypsin to the particles, oscillating at 37 deg.C for 24-48 hr, washing with distilled water three times, adding TritonX-100, oscillating at 4 deg.C for 48-72 hr, flushing with distilled water for 48 hr, centrifugal separation of deposit, mixing with distilled water, freeze drying, UV irradiating, Co60 irradiation, digestion by trypsin, stirring, pulverizing and washing with distilled water three times.

The invention discloses an ozone electrolysis chamber electrolysis structure. The ozone electrolysis chamber electrolysis structure comprises a cathode sheet, an anode sheet and a membrane arranged between the cathode sheet and the anode sheet. One side face of the membrane is parallel and opposite to the side face of the cathode sheet, the other side face of the membrane is parallel and oppositeto the side face of the anode sheet, and the surfaces / the surface of the cathode sheet and / or the anode sheet are / is provided with through holes. The through holes formed in the cathode sheet and theanode sheet are staggered, and axial projections are not overlapped. Through holes formed in the surface of the membrane are axially opposite to the through holes formed in the surface of cathode sheet or the anode sheet. The cathode sheet and the anode sheet are electrically connected through water flowing through the cathode sheet and the anode sheet. Compared with the prior art, the technical scheme has the advantages that the structure is simple, and disinfection is efficient; and the purposes that the ozone water electrolytic tank manufacturing cost is reduced, and the ozone water generation efficiency and sterilization purification capability are improved can be effectively achieved.