42results about "Tribo-charging spraying" patented technology

Method for electrostatically depositing select doses of medicament powder at select locations on a substrate. Specifically, the apparatus contains a charged particle emitter for generating charged particles that charge a predefined region of a substrate and a charge accumulation control circuit for computing the amount of charge accumulated upon the substrate and deactivating the emitter when a selected quantity of charge has accumulated. Additionally, a triboelectric charging apparatus charges the medicament powder and forms a charged medicament cloud proximate the charged region of the substrate. The medicament particles within the medicament cloud electrostatically adhere to the charged region. The quantity of charge accumulated on the substrate at the predefined region and the charge-to-mass ratio of the medicament powder in the cloud control the amount (dose) of medicament deposited and retained by the substrate. Consequently, this apparatus accurately controls both medicament dosage and deposition location. Furthermore, since the substrate can be of any dielectric material that retains an electrostatic charge, the apparatus can be used to deposit medicament on substrates that are presently used in oral medicament consumption, e.g., substrates that are used to fabricate suppositories, inhalants, tablets, capsules and the like.

A system and method for applying a material, such as a polymer composition, to a substrate, the method comprising mixing the material with a heated carrier gas stream, spraying the material through a nozzle, and radiant and convective heating of the material during transport. Preferred embodiments of the system and method can be used to spray polyetherimides, polyimides, polyamides, thermoset resins (e.g., and epoxies, polyesters and silicones), liquid crystal polymers, compositions comprising a blowing agent, compositions comprising a binder, compositions comprising a metallized material, compositions that produce an open cell foam, and compositions that produce a closed cell foam.

A powder atomizer comprises a rotatable powder conveying brush operably associated with a powder supply. A powder receptacle has an inlet and an outlet. The powder conveying brush extends along the inlet and supplies powder to the receptacle. A rotatable powder metering brush is operatively associated with the outlet and withdraws powder from the receptacle. A rotatable powder atomizing brush is operatively associated with and receives powder from the metering brush and discharges the powder. A shoe is operatively associated with the atomizing brush, and is pivotable about a pivot axis between a first and a second position.

Control method and apparatus for a manual spray gun may include a second manually actuated trigger disposed on the spray gun handle, with the second trigger being operational to select or change one or more coating operation parameters.

A plurality of unconventional negative tribo-charging materials are described for use as the powder contact surfaces in tribocharging and corona powder spray guns, gun compounds, and powder delivery system components. The invention also provides a short barrel tribo-charging powder spray gun having an interchangeable powder contact insert and nozzle, with turbulence inducing air jets. The invention further provides novel tribocharging and corona gun designs. Improved powder coating systems are made possible wherein, for example, negative tribo guns can be utilized with negative corona guns to coat different parts of the same workpiece in a powder coating system and to realize a repair coating process. Also proived is an inside-out configuration in which pressurized air directs powder coating material outward towards a charging surface. Additional configurations provide airjet induced tribocharging and conventional tribocharging portions combined in a single gun.

The present invention relates to a spraying nozzle, a spraying device including such a nozzle, and a spraying method implementing such a device. A nozzle for projecting powdery sold products for coating objects. The nozzle comprises a body having an essentially cylindrical shape and comprises at least two tunnels extending there through and insulated from each other. Each tunnel developing helically about a main axis of the nozzle. The tunnels are independently supplied with a fluid/powdery solid(s) mixture. The helical shape of the tunnels makes it possible to obtain a powerful jet with a conical shape capable of coating the inner surfaces of tubular objects.

The invention provides a molding device of a thickening powder material, and relates to the technical field of powder depolymerization (homogenization) preparation and molding of blank bodies. According to the device, an action principle of polarized electrification of a high-voltage discharging needle or electrification by friction caused by air stream impact is utilized, the powder shows the same electric charge, rejection reaction is increased so as to control aggregation of the powder, and a conventional powder depolymerization (homogenization) preparation process is replaced, so that thequality and the efficiency of the depolymerization operation can be improved, the corresponding equipment input and workload are reduced, and the working cost is reduced. Meanwhile, in a static fieldof a blank body molding process, an alternating current electromagnetic field sensing device is additionally arranged, so that gas (air and negative ion gas) filled between powder materials is once ionized, directional vortex motion is carried out under an effect of an induced electric field, the phenomena that ions are escaped from a powder coating and then electric charge carried in the powder is neutralized are effectively terminated, the self-limitation property is eliminated, and the thickness dimension of the powder coating can be effectively increased and controlled; meanwhile, production procedures can be simplified, so that the production efficiency is improved, and energy consumption is reduced.

To provide a composition for powder coating material which can be sufficiently pulverized, and with which a powder coating material capable of forming a coating film excellent in weather resistance and adhesion to the substrate can be obtained; a powder coating material capable of forming a coating film excellent in weather resistance and adhesion to the substrate; and a coated article having a coating film excellent in weather resistance and adhesion to the substrate, on its surface. A composition for powder coating material comprising a polyvinylidene fluoride (A) having a melting point of from 151 to 200° C., and an acrylic resin (B) having a glass transition temperature of from 40 to 90° C. A powder coating material comprising the composition for powder coating material, and a coated article having a coating film formed of the powder coating material.

The powder coating apparatus is provided with a coating booth into which a ground-connected object to be coated can be delivered and a plurality of coating tools respectively provided on the coating booth and adapted to discharge electrically charged powder coating materials onto the object to be coated. At least two of the coating tools are disposed on walls of the coating booth such that discharge openings thereof for discharging the powder coating materials are opposed to each other. The respective opposed discharge openings simultaneously discharge the powder coating materials onto the object to be coated. The powder coating materials, which are discharged from one of the at least two coating tools and are diffusing in the interior portion of the coating booth, are moved up to the object to be coated by a delivering air discharged together with the powder coating materials from the other of the two coating tools.

A plurality of unconventional negative tribo-charging materials are described for use as the powder contact surfaces in tribocharging and corona powder spray guns, gun components, and powder delivery system components. The invention also provides a short barrel tribo-charging powder spray gun having an interchangeable powder contact insert and nozzle, with turbulence inducing air jets. The invention further provides novel tribocharging and corona gun designs. Improved powder coating systems are made possible wherein, for example, negative tribo guns can be utilized with negative corona guns to coat different parts of the same workpiece in a powder coating system. Also provided is an inside-out configuration in which pressurized air directs powder coating material outward towards a charging surface. Additional configurations provide air jet induced tribocharging and conventional tribocharging portions combined in a single gun.

A method and device is provided for detecting a flow of particles, particularly paint particles, in a powder transportation line connected to a powder spray gun. The powder transportation line of the device includes a portion having an interior face provided with an electrostatically friction charging material. The portion of the transportation line may be located upstream or downstream of the pump or within the pump itself. The transportation line portion is in electrical communication with a unit for sensing electrical signals. When the powder particles flow through the transportation line portion, an electrical charge is generated in the portion as a result of the friction between the particles and the friction-charging material. This electrical charge is detected by the sensing unit.

The invention relates to a valve unit (6) for a coating system, in particular as an integrated colour changer or two-component mixer in a rotary sprayer (1), having a housing (7, 8) and at least one valve receptacle (15) which is arranged in the housing (7, 8) and serves to receive a valve (21). It is proposed that the housing (7, 8) has at least one first housing part (8) and one second housing part (7), wherein the first housing part (8) is composed of a different material than the second housing part (7).

An electrostatic painting apparatus (1) includes: a paint gun (4) that has a bell cup (4a) serving as an atomization portion that atomizes a paint, and an air nozzle (7) serving as an air discharge portion that discharges shaping air for controlling a diffusion pattern of the atomized paint; a high-voltage generator (5) that applies a high voltage to the paint gun (4); and a controller (6) that controls the high voltage to be applied from the high-voltage generator (5), wherein the high-voltage generator (5) generates a high positive voltage.

The present invention is a method for covering an object with a film resulting from the melting of a thin layer of powder, in which method comprises: (a) having a bed of electrified fluidized powder in a tank, this powder being charged by a forced-circulation tribocharging device; (b) dipping the object, connected to zero or sufficient potential, into the tank in order to cover it with powder; (c) placing the object, covered with the powder, in an oven at a temperature high enough to obtain the coating film by melting the powder. According to one advantageous embodiment of the invention, the oven includes electrodes raised to a high electrical potential so as to cause a corona effect which compensates for the relaxation of the charge on the powder particles while they are being heated. The charge on the particles is maintained and therefore they remain on the object and thus can form the film by melting. The present invention also relates to the apparatus for implementing the method.

The invention discloses a steel plate spraying machine capable of utilizing static electricity and achieving automatic spraying. The machine comprises a spraying machine body, wherein a belt cavity isformed in the spraying machine body, a linkage device is arranged in the belt cavity, a power motor is fixedly arranged in the left wall of the belt cavity, and power of the linkage device comes fromthe power motor. A friction cavity is formed in the left side of the belt cavity, the left end face of the power motor is in power connection with a lead screw, the left end face of the lead screw penetrates through the belt cavity and extends into the friction cavity, and a transversely-moving sliding block capable of sliding left and right is arranged in the friction cavity. The manner that furrubs with a rubber rod, and then the rubber rod carries negative electricity is utilized, firstly, electrons carried by the rubber rod are transmitted to paint, then the paint carrying the electronsis sprayed to a grounded steel plate through a spray head, due to the fact that the steel plate is grounded, the electric potential energy of the steel plate is zero, then the paint can be effectivelysprayed to the surface of the steel plate, waste is reduced, meanwhile, the spray head can swing, and the spraying effect is improved.