SU1659712A1 - Method of producing a charged droplet jet - Google Patents

Abstract

The invention relates primarily to recording information, in particular, to methods for obtaining a jet flow, which makes it possible to increase the charge on the droplets by 1.5-2 or more times without changing the corona discharge parameters and does not require the use of additional energy sources for droplet evaporation. In the method, a sequence of charged droplets is formed from a jet pre-charged in the corona field, and since the non-dispersing part of the jet has a larger surface area than the total area of droplets formed, this leads to an increase in the charge deposited on the droplets. The degree of efficiency of the method depends on the frequency of splitting and the thickness of the jet, i.e. on the ratio between the diameter of the droplets formed and the diameter of the jet. 3 il. CL

Description

The invention relates primarily to the technique of a general purpose recording device, in particular, to methods for producing a charged droplet jet stream.

The purpose of the invention is to increase the degree of electrification of the flow droplets.

FIG. 1 shows a block diagram of a device implementing the proposed method; in fig. 2 shows the dependence of the discharge current on the position of the electrodes forming the corona discharge field; in fig. 3 shows the dependence of the ratio of currents in the system of corona electrodes as a function of the ratio of the rate of jet flow to the frequency of droplet formation.

The device contains a piezoelectric mechanical disturbance generator 1 connected via a meter 2 to a generator 3 setting a frequency of disturbances, a two-coordinate table 4 from which a jet of liquid 5 is ejected from a cylindrical die, corona electrodes 6 and 7 connected to a power source 8 through an ammeter 9, and a liquid collector 10 connected to a common bus through an ammeter 11.

Under the influence of the mechanical oscillations of the generator 1, the string 5 is broken up into droplets, the length of the non-suspended jet 5 is changed by changing the oscillation amplitude of the generator 1, and the frequency of the droplets is set by the oscillation frequency of the generator - generator 3. 7, with the corona current being carried out

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liquid drops are recorded by an ammeter 11, and the corona discharge current flowing from electrode 7 to power supply 8 is recorded by ammeter 9. The dependence of the discharge current on the position of the system of electrodes b and 7 relative to the location of the jet 5 and the length of the non-dissolved part of the jet 5 has nonlinear character (Fig. 2) and a pronounced maximum when the corona discharge floor is in the middle of the non-collapsing jet 5. The dependence of the ratio of currents in the system of corona discharge

electrodes 6 and 7 from y t, where f is the frequency

energy transfer from generator 1 to jet 5; V is the flow rate of the jet 5 from the cylindrical die, with a constant diameter of the jet 5, is shown in FIG. 3. Dependence shows that the degree of electrization of the droplets of the flow can be increased two or more times.

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Claims of the method for producing a charged calliper flow, in which, creating an overpressure, the fluid is ejected 5 through a cylindrical die, then the ink jet ejected from the die is broken into droplets by periodically transferring the energy of the droplet generator to the jet and electrifying the ejected from the liquid die in the corona discharge field, characterized in that, in order to increase the degree of electrization of the flow droplets, the corona discharge field is created in the region of the non-decaying part

15 jets, and the energy from the droplet generator is transferred to the jet of liquid with a frequency selected from the relation:

.V,. t $ 9 D

20 where f is the frequency of energy transfer; V is the jet flow rate; D is the diameter of the jet in the undissolved part.

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Claims (1)

Claim A method of producing a charged droplet stream, in which, creating excess pressure, the liquid is ejected through a cylindrical die, then the jet of ink ejected from the die is broken into drops by periodically transferring the droplet generator energy to the jet and electrifying the liquid ejected from the die into the corona discharge field I distinguish with the fact that, in order to increase the degree of electrification of the droplets of the flow, a corona discharge field is created in the region of the undecayed part of the jet, and the energy from the droplet generator provide a fluid jet at a frequency selected from the relation: where f - frequency of energy transfer: V - velocity jet discharge: D - diameter of the jet in nondecomposed portion. (Doug. 1 Order 1832 Circulation 332 Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.