SU142553A1 - Method of coating in a high voltage electrostatic field on semi-finished wood - Google Patents

Description

A known method of coating a high voltage electrostatic field on semi-finished products made of wood.

However, the known method does not provide for the application of an alcohol-soluble phenol-formaldehyde resin to veneer, which is its disadvantage.

The method proposed according to the invention, is devoid of this disadvantage. The essence of the invention is that the veneer is heated to a temperature of 60 ° and then placed on the positive electrode. After that, the veneer is treated with a resin solution heated to 60 ° with a gradient of electric field strength from 3 to 6 kV / cm.

None of figs. I shows the scheme of the proposed method; in fig. 2 - an example of the scheme of the automatic line, the basis of pus on the application of the proposed method, top view; in fig. 3 is a section along A-A of FIG. 2

The automatic line for coating in an electrostatic field a high voltage on semi-finished products made of wood, for example, veneer /, consists of a mechanism 2 of a sheet load of ishona /, a chamo 3 for heating veneer /, a corona cup, a belt electrode (conveyor) 5 cleaning electrode 5, conveyor belt 7, overturning device S, precision conveyors 9 and 10, dryer Y / d for treated veneer, table J2 and pipelines / 3 for feeding solution.

The equipment and apparatus for carrying out the proposed method is an electrostatic painting installation.

No. 142553 -2 The ability of particles of various materials to acquire a charge in an electric corona discharge field is the basis of OKpacKii electrostatic processes. At the same time, the efficiency and uniformity of the deposited charged particles depend not only on their charge, but also on the nature of the interaction of the charged particles with a viscous air medium, as well as on the physical effects that occur during electric spraying and on a grounded electrode.

When an electric charge is seen on a particle of a paint-and-lacquer material, it carries it along the electric field's field line to the oppositely charged electrode 5.

The force acting in the electric field on a particle of a solution, due to the number of electrons that fall on the particle.

M; 1, KG1R1eski for treating a veneer with a solution in an electric field have. Numbers;

FIG. 1 are designated by F the force acting on the solution particle from normal acceleration, Pn is the vector of translational motion of the particle, F is the resultant, F, is the force acting on the particle from the action of an electric field, and n is the resultant of all forces acting on a drop.

In this case, the corona maker 4, receiving negative charge and axial rotation, is an electrostatic atomizer, since the spraying of the solution entering the bowl occurs 1m as a result of the action of mechanical (centrifugal) forces and electric field forces.

Due to the fact that the shpone sheets have a small thickness (0.55 mm), when placed on the positive electrode 5 with a field strength gradient of 3 to 6 sq / cm, the dispersion of the solution is obtained.

This ensures a uniform application of the phenol-formaldehyde resin solution and its incorporation into the grooves.

When the line is operating, the veneer sheet / format 1600X1300, 0.55 of thickness from the package, is fed by the sheet feed mechanism 2 into chamber 3, where it is heated to a temperature of 60 °. From chamber 3, a sheet of veneer enters the electrode 5 and is treated with a solution in an electrostatic field by means of a corona cup 4.

Mechanism 6 provides tensioning of the ribbon electrode 5 and cleaning from the resin solution that has fallen on it. The branches of the belt conveyor 7, the sheet of the spike, is put on the blades of the inverting device 8. From the blades, the inverted sheet of the spike is removed by the belt conveyor 9 and goes to the electrode 5 on the right side. After treatment with the impregnating solution of the resin of the second side of the sheet, it is transported by a belt conveyor 10 to a dryer 11, for example, CT-3.

The whole technological process of treatment of the spike in an electrostatic field occurs continuously.

Subject invention

The method of coating in a high-voltage electrostatic field on semi-finished products made of wood, characterized in that. In order to apply an alcohol-soluble phenol-formaldehyde resin to the schpon, the latter is heated to a temperature of 60 °, placed on a positive electrode and then treated also with a solution of the resin heated to 60 ° with an electric field gradient of 3-6 kV / cm.

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