Abstract:
Uniform portions of fine powders are deposited on a substrate by electrostatic attraction in which the charge of the electric field and polarity of the charged particles are varied repeatedly to form a buildup of powder on the carrier surface.
Abstract:
This invention provides a powder compression molding machine including: upper punches and lower punches disposed to face with each other along one central axis; die holes allowing tips of the upper punches and the lower punches to be respectively inserted thereinto, the upper punches and the lower punches being shifted to approach each other with the tips thereof being inserted in the corresponding die holes, so that a powder material filled in the die holes is compressed and molded; and powder lubricant spraying means for spraying a powder lubricant toward the die holes before the powder material is filled therein, wherein the powder lubricant spraying means includes: a downward spray nozzle that sprays the powder lubricant toward the die holes; a powder lubricant retrieving mechanism that retrieves a superfluous powder lubricant out of the powder lubricant sprayed from the powder lubricant spraying means; a charging device that electrostatically charges the powder lubricant sprayed from the downward spray nozzle; and switching means that is connected to the charging device and switches to allow only the powder lubricant sprayed at a timing of reaching each of the die holes to be electrostatically charged.
Abstract:
An electrostatic atomizer has a power source powering a charge injection device. The power source is arranged to vary the net charge injected by the charge injection device cyclically in accordance with a pattern of variation so that the net charge repeatedly increases to a higher value at or above a long-term breakdown value. The net charge injected is reduced by the power source to a lower value below the long-term breakdown value so that corona-induced breakdown is reduced. A method for electrostatically atomizing a fluent material is provided. The method includes the step of cyclically varying the net charge injected to reduce the occurrence of corona-induced breakdown.
Abstract:
An electrostatic centrifugal spraying system for direct electrification includes a tank configured to store liquid. The tank includes an internal dielectric surface and an external conducting surface, wherein when the liquid is stored in the tank, the tank is configured to act as a capacitor storing electrical energy for electrostatic spraying. The spraying system further includes a power supply, configured to electrify liquid drops of the stored liquid, and a spray nozzle, comprising a spray disk for blowing the electrified liquid drops unto a target.
Abstract:
There is provided an electrostatic atomizer that electrostatically atomizes a liquid supplied to a discharge electrode by electric discharge caused by an electric field formed in response to voltage application to the discharge electrode. The electrostatic atomizer has a high-voltage generation circuit that generates a pulse voltage to be applied to the discharge electrode, and the high-voltage generation circuit includes a high-voltage control circuit that converts an input AC signal to a pulse signal, and an igniter that steps up the pulse signal obtained by the high-voltage control circuit to a voltage value of the pulse voltage to be applied to the discharge electrode.
Abstract:
An improved method of controlling stability and deposition of electrospray jets which eliminates a charge accumulation the electrospray jet, source or target is described. Utilizing an alternating rather than a direct or constant electric potential for electrospray production, accumulated charge is neutralized. Applications include improved surface deposition, controlled electrospinning, and simplified spacecraft electric propulsion, to name a few.
Abstract:
In a liquid discharging device, an objective optical system is moved in the optical axis direction by a focus position adjusting mechanism to perform a first focusing action relative to the tip of a liquid discharging nozzle or a mirror image thereof and a second focusing action relative to the surface of a substrate facing the liquid discharging nozzle, the distance between the nozzle tip and the surface of the substrate is calculated on the basis of the resulting focus positions, and the position of the liquid discharging nozzle is adjusted by nozzle position adjusting mechanism so that the gap is appropriate. According to this configuration, the distance between the nozzle tip and the surface of the substrate can be precisely calculated and an optical unit for observation can be focused on the surface of the substrate.
Abstract:
A particle generation apparatus and a particle generation method each employ: (1) a nozzle from which exits a liquid micro-jet stream; and (2) a ground electrode separated from the nozzle, where both the nozzle and the ground plane are DC voltage biased when operating the nozzle. Each of the particle generating apparatus and the particle generating method also employ a pair of AC electrodes interposed between the nozzle and the ground electrode and perpendicular to the liquid micro-jet stream. When a liquid supply is supplied to the nozzle, a DC voltage bias is supplied to the nozzle and the ground electrode, and an AC voltage bias and AC frequency bias is applied to the pair of AC electrodes a liquid particle spray is generated by the apparatus and the method. With additional parametric adjustment, the liquid particle spray may be monodisperse and bifurcated.
Abstract:
An improved electrostatic powder painting apparatus is described herein, in which in the vicinity of a discharge electrode disposed in opposition to a body to be painted there is separately provided a driving electrode, for establishment of a driving electric field. The generation of a mono-polar ion current is achieved by said discharge electrode, so that the driving electric field and the ion current density may be controlled quite independently of each other, whereby generation of inverse ionization can be prevented perfectly, while a maximum amount of electric charge can be given to paint powders and a maximum driving force is acted upon said paint powders.
Abstract:
An apparatus includes a catheter, and an electrode and methods of delivering molecules to eukaryotic cells using such an apparatus. The catheter defines a fluidic channel and has a distal opening. The electrode is within the fluidic channel and is spaced a distance from the distal opening of the catheter. The catheter is arranged to prevent direct contact between any electrode of the apparatus and tissue. Related apparatus, systems, techniques and articles are also described.