JPS59102466A - Printing device for hollow insulator - Google Patents

Abstract

PURPOSE:To improve painting efficiency and to form a uniform paint coated film by impressing a high voltage on an electrode inserted into the hollow part of a hollow insulator, and spraying atomized paint particles toward the outside surface of the hollow insulator thereby maintaining an effective electrostatic field between the hollow insulator and a sprayer. CONSTITUTION:A glass bottle 6 is conveyed with a conveyor and, for example, a high voltage having a positive polarity is impressed on a multi-needle type electrode 16 inserted into the hollow part of the bottle 6 by a high voltage generator 17 in the case of painting, for example, the bottle 6. Then, corona discharge is generated between the electrodes 16 and the bottle 6 is electrified positive. The bottle 6 is then conveyed into a painting booth where the paint forcibly fed to a sprayer 8 impressed with a negative high voltage on a needle-like electrode 14 inserted therein by a high voltage generator 13 and is atomized by said sprayer is sprayed toward the bottle 6. The atomized paint particles sprayed from the sprayer 8 are electrified to a negative potential by the effect of the electrode 14. The electrified fine paint particles are scattered surely toward the bottle 6 by the effect of the electrostatic field formed between the sprayer 8 and the bottle 6 having the different polarity therefrom and are deposited efficiently on the outside surface of the bottle 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for painting the outer surface of a hollow insulating object formed of an insulating member, such as a glass bottle, a glass container, a fishing rod, etc., by spraying a paint on the hollow insulating object. The present invention relates to a hollow insulator coating device for coating.

Generally, as a coating device for coating articles or forming a purulent coating, an electrostatic field is formed between the article to be coated and a sprayer that sprays the paint, and the sprayer An electrostatic coating device that uses the action of this electrostatic field to direct the sprayed paint particles toward the object to be coated by flight can create a uniform coating film and also has good coating efficiency. Therefore, it is widely used in various fields. In this case, in order to form an electrostatic field between the sprayer and the article to be coated, a high voltage is applied to the sprayer and the article to be coated is held at ground potential, or conversely, the article to be coated is held at ground potential. It is necessary to apply a high voltage to the sprayer and keep the sprayer at ground potential, or to charge it to a potential different from that of the article to be coated.

By the way, when painting an object made of an insulating material such as glass or glass stick, since the object is a lightning insulator, an electrostatic field is created between it and the sprayer. is extremely difficult to form. For this purpose, the article to be coated must be made conductive in advance by immersing it in a conductive treatment liquid or applying it, which has the disadvantage of complicating the coating process. Ta.

On the other hand, when the object to be coated is a hollow body such as a glass bottle, a method of electrostatically coating the outer surface of the hollow PR object without performing the above-mentioned pretreatment is disclosed, for example, in JP-A No. 52-30848. Those shown in the official gazette are known. In this method, a grounding conductor is inserted into the hollow part of the hollow P edge so that the hollow insulator is maintained at a ground potential. However, since the hollow insulator is to be painted in a charged atmosphere, the hollow insulator must be gradually charged to the same potential as the sprayer, and should be painted with the sprayer. It has the disadvantage that it cannot effectively maintain the electrostatic field between it and the hollow insulator.

The present invention has been made in view of the above points, and an object of the present invention is to provide a hollow insulating material coating device that maintains an effective electrostatic field between the hollow insulating material and a sprayer. .

In order to achieve the above-mentioned object, the hollow insulating material coating apparatus according to the present invention includes an electrode inserted into the hollow insulating material, a pressure generating device for applying a high voltage to the electrode, and a pressure generating device that applies a high voltage to the hollow insulating material. and a sprayer that sprays fine paint particles toward the outer surface of the
The present invention is characterized in that fine particles of paint are applied by flight to the outer surface of the hollow insulator by means of an electrostatic field formed between the sprayer and the electrode.

By adopting such a configuration, a static field is effectively formed between the hollow insulating material to be coated and the sprayer, so that the paint particles sprayed from the spraying machine are sprayed onto the hollow insulating material. It is possible to reliably fly toward the surface and efficiently apply it to the outer surface.

Here, in the present invention, the hollow insulator is formed of an insulating member such as glass, delastic, rubber, ceramic, etc., and is used for hollow mouths such as containers such as bottles, fishing rods, clothes rods, etc. The hollow body is not limited to one with a bottom, but may be one with an open end. In the case of a hollow body with an open end, coating efficiency can be improved by performing the painting operation with the end closed with a filler or the like. In addition, there are various types of paints, including conductive and non-conductive paints, as well as waterproof and
Contains coating agents for forming protective films for rust prevention, breakage resistance, etc. Further, as the atomizer, a mechanical atomizer, an electrostatic atomizer, a hydraulic atomizer, an air atomizer, a rotary atomizer, or the like can be used.

EMBODIMENT OF THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings in the case where a glass bottle is used with a hollow insulating material closed and the outer surface of the glass bottle is painted.

First, FIG. 1 shows a first embodiment of the present invention. In the same figure, 1 indicates a chain conveyor, and a shaft 3 is rotatably protruded from the chain conveyor 1 via a bearing 2. ing. A pinion 4 is fixedly attached to the shaft 3, and the pinion 4 meshes with a rack 5 attached to the chain conveyor 1. Reference numeral 6 indicates a glass bottle as a hollow insulator to be painted, and the glass bottle 6 is attached to a holder 7 made of an elastic material such as rubber attached to the tip of the shaft 3, and transported by a chain conveyor 1 into the coating booth. transported to. Since the shaft 3 is engaged with the vinyl rack 5 provided on the shaft 3, the shaft 3 is rotated while the chain pump 1 is being transported. For this purpose, the glass bottle 6 is rotated by the shaft 3 and conveyed through the coating booth along the chain conveyor 1, during which time the outer surface of the glass bottle 6 is coated. , 8 indicates a sprayer that sprays conductive or non-conductive paint toward the glass bottle 6, and the sprayer 8 is connected to a paint supply tank 9.
The tank 9 and the sprayer 8 are connected by a hose 10, and the hose 10
A bong 7612 that is driven by the motor 11 and forces the paint toward the sprayer 8 is interposed in the middle.

Reference numeral 13 indicates a high voltage generator that generates, for example, a negative high voltage. It is possible to apply a high voltage (for example, -90 kV).

Next, reference numeral 16 denotes a multi-branched needle-like electrode inserted into the inside of the glass bottle 6, and the multi-branched needle-like electrode 16 is attached to the tip of the shaft 3. In addition, 17 is a high voltage generator that generates a positive high voltage, and the high voltage generator 17 is attached to a belt-shaped electrode 18 attached to the chain conveyor 1 and the shaft 3,
The multi-branched needle-like electrode 16 is charged to a potential different from that of the sprayer 8 through a power supply device comprising a metal roller 19 that contacts the strip-shaped city pole 18. Since it is necessary to energize the multi-branched needle electrode 16 of the shaft 3, and not to energize the chain conveyor 1 via the pinion 4, the rack 5, or the bearing 2, the upper part of the skeleton shaft 3 is a conductive shaft. The portion 3A and its lower part are an insulating shaft portion 3B.

The coating apparatus according to the present invention has the above-mentioned configuration, and the case where the coating operation of the glass bottle 6 is performed using this apparatus will be explained next. First, the glass bottle 6 is attached to the holder 7, and the chain conveyor 1 is driven to convey the glass bottle 6 into the coating booth. Then, a high voltage having, for example, positive polarity is applied to the multi-branched needle-like electrode 16 via the high-voltage generator 17 and a power supply device consisting of a band-like electrode 18 and a roller 19 . For this purpose, Taeda [SeS electrode 16
A corona discharge occurs, and the glass plate 6 becomes positively charged. In this way, the glass bottle 6 is transported into the coating booth. On the other hand, a high voltage force having a different polarity from the multi-branched needle electrode 16 is applied to the needle electrode 14 of the sprayer 8 by the high voltage generator 13 . Along with this, Ponzo 1
Tank 9 through hose 10 by driving 2
The paint inside is forced into the spray tank 8. And sprayer 8
The paint is atomized by the atomizer 8 due to the hydraulic atomization effect caused by the hydraulic pressure of the paint. Like this! {By spraying the atomized paint particles toward the glass bottle 6, the coating force of the glass bottle 6 is started.

Thus, the paint particles sprayed from the sprayer 8 are charged to a angular potential while passing through the ion range formed around the needle electrode 14. Then, due to the action of an electrostatic field formed between the sprayer 8 and the positively charged glass bottle 6, which has a different polarity, the charged paint particles are reliably directed toward the glass bottle 6. Next, FIG. 2 shows a second embodiment of the present invention, and in this figure, the same components as in FIG. 1 are designated by the same reference numerals. , and the explanation thereof will be omitted. However, in this embodiment, a coating apparatus particularly suitable for coating the glass bottle 6 using a conductive paint is shown. In the figure, 2
Reference numeral 1 indicates a sprayer, and the sprayer 21 is not connected to a high voltage generator and is not provided with a needle electrode.

The sprayer 21 is configured to be maintained at a ground potential at all times. Further, the paint in the paint supply tank 9 is pressurized by the pump 12 and supplied to the sprayer 21,
The sprayer 21 uses this hydraulic pressure to atomize the paint, and the thus atomized paint is directed toward the glass bottle 6 and is configured to perform mfPA.

By adopting the above-mentioned configuration, the glass bottle 6 can be charged to a square or positive potential by the high voltage supplied from the high voltage generator 17 to the multi-branched needle electrode 16. Since the sprayer 21 is held at ground potential, an electrostatic field ball is formed between the glass bottle 6 and the sprayer 21, and the paint sprayed from the sprayer 21.
The particles fly toward the glass bottle 6 along this electrostatic field and are efficiently coated on the outer surface of the glass bottle 6. If the coating device is configured in this way, there is no need to connect a high voltage generator to the sprayer 21, so even if an electrically conductive paint is used, there is no need to insulate the paint tank, motor, etc., making it safer. In addition to increasing the completeness of the coating process, it is also possible to improve coating equipment.

Furthermore, FIGS. 3 and 4 show modified examples of electrodes used in the coating apparatus of the present invention and inserted into the hollow insulator. And in the 4th @, there is T? The use of an 11 iron wire electrode 16'' is shown.

Electrode 16' having the configuration as described above. 16", it is also possible to generate a corona discharge in the glass bottle 6, and an effective electrostatic field is created between the electrodes 16', 16" and the sprayer, which is charged with a different polarity or held at ground potential. can be formed.

Note that the first electrode is inserted into the hollow insulator.
A multi-branched needle electrode 16 as shown in FIG.
If a needle electrode such as a single needle electrode 16' as shown in the figure or a barbed wire frost electrode 16'' as shown in FIG. 4 is used, a corona discharge can be generated within the hollow insulator. Although it is extremely advantageous for forming an electrostatic field, electrodes in various shapes such as rods and plates can be used as long as they can form an electrostatic field between the sprayer and the hollow insulator. be able to.

As explained above, according to the hollow insulating material coating apparatus according to the present invention, the electrode is inserted into the hollow insulating material and a high voltage is applied to the electrode. An electrostatic field can be effectively formed between the two, and due to the action of this electrostatic field, the paint particles sprayed from the sprayer can be directed toward the hollow insulating material and be reliably coated by flight, thus increasing the coating efficiency. In addition, the coating film becomes uniform and the quality of the coating is also improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a hollow insulating material coating apparatus showing a first embodiment of the present invention, FIG. 2 is an explanatory diagram of a hollow insulating material coating apparatus fσ showing a second embodiment of the present invention, and FIG. and FIG. 4 are sectional views of essential parts showing different modifications of the electrode used in the present invention. 6... Glass bottle (nitrogen insulator), 8, 21... Sprayer, 13, 17... High voltage generator, device, 15... High voltage cable, 16... Multi-branched needle Electrode, 161...
Single needle electrode, 161...barbed wire electrode. -395-

Claims (3)

[Claims] (1) A hollow insulator coating device for coating the outer surface of a hollow insulator, which includes an electrode inserted into the hollow insulator, a high voltage generator that applies a high voltage to the electrode, and a and a sprayer that sprays paint toward the outer surface, and paint fine particles are applied by flying toward the outer surface of the hollow insulator by an electrostatic field formed between the sprayer and the electrode. A hollow insulation material coating device characterized by: (2) Claim (r) in which the electrode is a needle-like electrode
Hollow insulating material coating equipment as described in section. (3) The hollow insulator coating apparatus according to claim (1), further comprising a high voltage generator that charges the sprayer to a potential different from that of the electrode. (4) The hollow insulator coating apparatus according to claim (1), wherein the sprayer is configured to be maintained at a ground potential.