83results about How to "Reduce dust generation" patented technology

Solid proppants are coated with a coating that exhibits the handling characteristics of a pre-cured coating while also exhibiting the ability to form particle-to-particle bonds at the elevated temperatures and pressures within a wellbore. The coating includes a substantially homogeneous mixture of (i) at least one isocyanate component having at least 2 isocyanate groups, and (ii) a curing agent comprising a monofunctional alcohol, amine or amide. The coating process can be performed with short cycle times, e.g., less than about 4 minutes, and still produce a dry, free-flowing, coated proppant that exhibits low dust characteristics during pneumatic handling but also proppant consolidation downhole for reduced washout and good conductivity. Such proppants also form good unconfined compressive strength without use of an bond activator, are substantially unaffected in bond formation characteristics under downhole conditions despite prior heat exposure, and are resistant to leaching with hot water.

A bulk material precision transfer chute apparatus transfers a flow of material from a discharge conveyor to a separate receiving conveyor. The apparatus receives a flow of material from the discharge conveyor and transfers that material to a receiving conveyor depositing the material in a precise manner that avoids spillage of the material from the receiving conveyor, avoids wear to the receiving conveyor, and avoids excess dust generation from the transfer of the material.

A lint-free wiper of the present invention is formed of a fabric containing no cut face in the structure thereof which may cause the generation of lint and fiber fall-off. Accordingly, the wiper can be used in a high-grade clean room of at least Class 100 without fear of dust generation. Since the dust-generation suppressing function is based on the fabric end structure formed of yarn loops, the wiper can be produced while eliminating fusion-bonding or an adhesion treatment of the cut face of the fabric. Therefore, the lint-free wiper can be composed of any materials including non-thermoplastic cellulosic fibers or others.

The invention relates to a process for the production of granules or powders, suitable as coating agents and binders for oral or dermal pharmaceutical forms, for cosmetics or food supplements, consisting essentially of (a) a copolymer, consisting of free radical-polymerized C1- to C4-esters of acrylic or methacrylic acid and further (meth)acrylate monomers which contain functional tertiary amino groups, (b) 3 to 25% by weight, based on (a), of an emulsifier having an HLB of at least 14, (c) 5 to 50% by weight, based on (a), of a C₁₂- to C₁₈-monocarboxylic acid or of a C₁₂- to C₁₈-hydroxyl compound, where the components (a), (b) and (c) are simultaneously or successively blended or mixed with one another, optionally with addition of a pharmaceutical active compound and/or further customary additives, fused in a heatable mixer, mixed, the melt is cooled and comminuted to give granules or powders.

Provided is a pellicle that has appropriate membrane strength, high resistance to chemicals, and a low degree of sulfate ion generation and outgassing. A provided pellicle frame supports the outer rim of a pellicle membrane, and an epoxy resin coating is formed on the surface of the pellicle frame. In the infrared absorption spectrum of said epoxy resin coating, the ratio of the absorbance of a peak in the range between 1450 cm⁻¹ and 1550 cm⁻¹ to the absorbance of a peak in the range between 1200 cm⁻¹ and 1275 cm⁻¹ is at least 0.5 and at most 3; also, the ratio of the absorbance of a peak in the range between 1450 cm⁻¹ and 1550 cm⁻¹ to the absorbance of a peak in the range between 905 cm⁻¹ and 930 cm⁻¹ is at least 1 and less than 7.

The present invention provides for coating proppants, such as sand, with a resin-containing dispersion which dramatically reduces the dust generated during handling, for example in hydraulic fracturing, by protecting the surface of the particle from abrasion and degradation. Such resin-containing dispersion coated-sand may also reduce the wear on metal parts used in transporting such proppants.

The invention discloses a manufacturing process of a fully-sealed touch control integrated liquid crystal screen. According to the manufacturing process, components which are arranged in sequence are glued to each other to form the fully-sealed touch control integrated liquid crystal screen through solid ultraviolet flexible glue; the components include a touch screen set, a liquid crystal screen set, an organic glass frame and a glass cover plate, wherein a backlight module is embedded among the liquid crystal screen set, the organic glass frame and the glass cover plate. According to transparent gluing bodies produced through the novel technology, bubbles cannot be easily generated, and the novel glued touch control display backlight integrated screen with features that the distances between every two adjacent gluing bodies are equal, the thickness difference and the unevenness difference do not exist, no stiffness phenomenon exists, and glue overflowing cannot easily happen can be manufactured.

Fibrous structures, more particularly fibrous structures comprising a region of auxiliary bonding and methods for making same are provided.

A shutter device makes it possible to restrict bounding of a shutter blade using a shock-absorbing member when movement of the shutter blade is completed. In addition, the shutter device makes it possible to reduce production of dust that is produced when the shock-absorbing member and the shutter blade collide with each other. Examples of dust are wear powder and flake.

The invention discloses a concrete mixer with an adjustable angle for construction, which includes a cylinder body, a feeding hopper, a fan and a motor; a sealed feeding device is installed in the corresponding cylinder directly below the feeding hopper, and the sealed feeding device includes There is a central rotating shaft, a feeding cavity, a partition and a sealing arc plate. The bottom of the mixing box is provided with an arc cavity, and a connecting rod is installed on the support shaft. The lower end of the connecting rod is fixed with a feeding scraper that matches the arc cavity; the adjustment mechanism It includes a fixed seat, a telescopic rod, a worm, a handle, a support bearing, a worm wheel, a guide rod, a screw rod, a lifting plate and a push rod. In the present invention, the raw materials are evenly fed into the interior through the sealed feeding device, which avoids the increase of the motor load and affects the service life of the motor. It is concrete dust, reduce the generation of dust, and protect the surrounding environment.

Embodiments of the present invention help to prevent data error occurrence in a hard disk drive by reducing the generation of dust caused by friction between a magnetic disk and a ramp. According to one embodiment, a hard disk drive comprises an enclosure, a motor for rotating a magnetic disk, an actuator for supporting a head slider for accessing the disk, and a ramp for loading/unloading the head slider disposed in the enclosure. The ramp comprises a tab slide formed of a resin material having a sliding characteristic to slide a tab at a tip end of the actuator at a specific velocity, and a slit on which a reinforcement made of a resin material with higher mechanical strength than the tab slide is formed.

The invention discloses a dust fall system for urban long and narrow type support-free deep foundation pit excavation construction. A foundation pit body is included. At least one of the two sides ofthe outer edge of an opening of the foundation pit body is provided with a shielding mechanism for pavement of dustproof net cloth towards the other side of the outer edge of the opening in the lengthdirection of the foundation pit body, a negative-pressure area for improving flow of air in the foundation pit body is formed between the dustproof net cloth and the outer edge of the opening of thefoundation pit body, guide rail assemblies which are in moving fit connection with the shielding mechanism are laid on the two sides of the foundation pit body in the length direction of the foundation pit body, and after the dustproof net cloth is laid and shielded, the two sides of the foundation pit body in the length direction of the foundation pit body are provided with a plurality of dust fall mechanisms for adsorbing and settling of raise dust in the foundation pit body, wherein the dust fall mechanisms are adaptive to the guide rail assemblies. According to the dust fall system, through the comprehensive means of shielding, adsorbing and settling, generation of raise dust is reduced to the maximum degree.

The invention discloses a wet concrete spouting process for use under a coal mine. A mechanical grouting production line is adopted, and comprises a crawler-type movable wet concrete sprayer, a crawler-type movable mixing station and a rubber-wheel movable belt feeder. The process comprises the following steps: feeding a mixed dry material into a stirring hopper of a stirring station by using a belt feeder; adding water into the stirring hopper; conveying wet concrete into a hopper of the concrete sprayer; pushing to a spray gun through a pumping system; spraying the concrete onto a tunnel construction surface in a circle-drawing manner by using compressed air containing a liquid setting accelerator; performing overall grouting on the roof and sides of a tunnel through the mechanical actions such as forward/backward extension and contraction, upward/downward pitching and leftward/rightward swing of a manipulator in the tunnel. By adopting the wet concrete spouting process, a dry (damp) spraying process adopted in the conventional grouting of tunnels under coal mines in China is eliminated, the hidden danger of dust endangering the health of workers is eliminated greatly, and the grouting mechanization level is raised.

A rotary current-collecting device includes a rotary slip ring and brushes coming into sliding contact with the outer peripheral surface of the slip ring. The brush-holding ring has an inner surface to which three brush-holding springs are fixed by screws. Each of the brushes is fixed to the tip end of the brush-holding spring and is pushed against the outer surface of the slip ring under the resilient restoration force of the brush-holding spring. When the slip ring revolves, the brushes come into sliding contact with the outer peripheral surface of the slip ring. The brush is made of a metal-graphite compound consisting of 70 weight percent copper and 30 weight percent graphite. The slip ring is entirely made of glassy carbon, so that the brush abrasion can be reduced.

The present invention relates to a mixed powder for powder metallurgy containing an iron-base powder and a carbon supply component, in which the carbon supply component contains a graphite powder and a carbon black, and in which a mixing ratio of the graphite powder to the carbon black is in the range of 25 to 85 parts by weight to 75 to 15 parts by weight; and a mixed powder for powder metallurgy containing an iron-base powder and a carbon supply component, in which the carbon supply component contains, as a main component, a carbon black having a dibutyl phthalate absorption of 60 mL/100 g or less and a nitrogen absorption specific surface area of 50 m²/g or less.

The mixed powder for powder metallurgy of the invention is less in the dust generation and segregation of the carbon supply component. Additionally, when the mixed powder for powder metallurgy of the invention is used, a green compact and a sintered body excellent in the mechanical property can be produced.