Abstract:
An electrostatic spray gun for spraying solid particulate powder materials while entrained in a gas medium, including an electrically non-conductive housing having an electrode extending forwardly therefrom and a straight electrically non-conductive powder transport tube adjustably and replaceably mounted within the housing so as to enable the discharge end of the tube to be positionably adjusted relative to the electrode or to be replaced with a tube of differing internal diameter so as to vary the transport velocity at which the powder is emitted from the discharge end of the tube.
Abstract:
An atomizer for coating an object with powder includes a spray gun with a central feed passage and an atomizer gas flow passage with an outlet radially outside the feed channel. Both the outlet from the feed channel and the atomizer gas passage outlet are located at a widening atomizer gas outlet. Upstream of the spray gun is a body with a plurality of obliquely inclined, axially extending flow channels in it which impart spiral rotation to the gas-powder mixture entering the feed channel in the spray gun. The housing for the body having the inclined flow channels in it is conically tapered upstream and downstream of that body, and upstream of that body there is an upstream facing conical element for directing flow into the flow channels.
Abstract:
The invention relates to a device for a nozzle of a powder sprayer, which by way of example can be used for spraying for example color powder, which is electrostatically charged, or for disintegration and distribution of solid particles in powder form transported in a gas stream. By means of the present device, which is easy to operate and easy to connect with a transportation circuit respectively, the particle material is effectively disintegrated and distributed. The device has means (17; 51, 58, 75, 76) for the introduction of a gas stream under pressure in the stream of particles flowing through the device, whereby the powder during its forward transportation through the device under simultaneous compression is mixed with the gas rushing in.
Abstract:
A workpiece which may be made of a highly electrically insulating material is held in a spaced opposing relationship with respect to a silent discharge plate electrode to which an a.c. voltage is applied. A d.c. voltage is applied across the workpiece and the silent discharge plate electrode to form a driving electric field therebetween. Powder particles suspended in air are charged in the same polarity as that of the silent discharge plate electrode and then injected into the region between the silent discharge plate electrode and the workpiece where the electric field drives the charged particles toward the workpiece to coat it. The a.c. voltage is sufficient to repel the electrode surface confronting the workpiece and to maintain the silent discharge at a reduced level and effectively precluding deposit of powder particles on the mentioned surface. An apparatus for the electrostatic coating is also disclosed.
Abstract translation:可以由高电绝缘材料制成的工件相对于静音放电板电极保持间隔开的相对关系。 施加电压。 一个d.c. 在工件和无声放电板电极之间施加电压,以在它们之间形成驱动电场。 悬浮在空气中的粉末颗粒以与无声放电板电极相同的极性充电,然后注入静电放电板电极和工件之间的区域,在该区域中电场驱动带电粒子朝向工件涂覆。 a.c. 电压足以排斥面对工件的电极表面,并将静音放电维持在降低的水平,并有效地排除粉末颗粒沉积在所述表面上。 还公开了一种用于静电涂覆的装置。
Abstract:
A method and apparatus for depositing flock wherein flock fibers are fed at a controlled rate from a storage hopper through a screen into a propelling air stream. The air stream carries the fibers in a rotationally stabilized flow to an applicator gun where they may be electrostatically charged, and they are propelled by the air stream and deposited on the adhesively coated surface to be coated.
Abstract:
A method for depositing flock wherein flock fibers are fed at a controlled rate from a storage hopper through a screen into a propelling air stream. The air stream carries the fibers in a rotationally stabilized flow whereby turbulence is prevented, to an applicator gun where they may be electrostatically charged, and they are propelled by the air stream and deposited on the adhesively coated surface to be coated.
Abstract:
This invention is in an improvement in electrostatic spraying apparatus for coating objects with electrostatic powder, or dust. The apparatus includes a housing or body member having a discharge nozzle at one end and internal flow passages for conducting compressed gas supplied from an external source to the discharge nozzle and a deflector element coaxially disposed adjacent the discharge end of the nozzle. A source of powder or dust is provided and is mixed with the compressed gas to produce a powder gas mixture which is fed to the flow passage. Electrodes connected to a high voltage source are provided within the flow passage and at the discharge end of the nozzle to ionize the powder gas mixture. The invention provides a hollow oval shaped charging chamber within the nozzle communicating with the flow passage so that the powder gas mixture passes therethrough and is ionized therein. Auxiliary compressed gas is also passed to the nozzle and is ionized so that upon being discharged at the tip of the apparatus, it assists in augmenting the final charge of the powder which substantially improves the electrostatic application to the object being coated.
Abstract:
On the downstream side of a large-diameter cylindrical flow path is disposed a small-diameter cylindrical flow path having a smaller inner diameter than the inner diameter of the large-diameter cylindrical flow path contiguously to the large-diameter cylindrical flow path, an annular electrode is disposed at the upstream end of the small-diameter cylindrical flow path, a needle electrode is provided at the center of the annular electrode applying a D.C. high voltage between the electrodes, and upon charging powder contained in a mixed-phase flow through said cylindrical flow paths, a substantial slip velocity is given to the mixed-phase flow adjacent to the surface of the annular electrode.
Abstract:
A powder system for electrostatically applying a powder coating to a can body side seam area. The system incorporates a catcher which is positioned and is of a configuration to catch and return substantially all of the powder overspray and stray powder particles. A constant vacuum is maintained in the catcher by way of a vacuum flow transducer.
Abstract:
An electrostatic flocking system having a supply hopper for controllably entraining flock fibers within a propelling air stream, and for feeding the entrained fibers to an electrostatic flocking gun. The fibers and propelling air pass through the gun and into a nozzle at the front of the gun having an elongated forwardly open chamber. An elongated electrode is carried within the nozzle chamber and is coupled to a suitable electric power source for electrostatically charging the fibers and for directing them forwardly over the entire length of the chamber toward the surface of an article being coated.