JPH0318510B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a method for applying a quantity of liquid to a large number of articles.

(b) Background of the technology A technology for coating a fixed amount of liquid at a low cost is required for various electrical parts.

(c) Prior Art and Problems Prior to the present invention, when a coating liquid contained a substance with a large particle size and a tendency to precipitate, there was no definitive method for efficiently applying a constant amount of the liquid.

Dispensers and the like are often used to apply the liquid to articles, but if the liquid contains large particles, the problem of needle clogging occurs.

(d) Object of the Invention It is an object of the present invention to solve the above-mentioned problem of "clogging" and to provide a relatively simple method for applying a fixed amount of liquid.

(e) Structure of the Invention According to the invention, the purpose is to immerse the ring of a coating jig in a liquid to be coated, and then pull it out of the liquid, and use the surface tension of the liquid adhering to the inner wall of the ring to fill the ring space. This can be achieved by forming a liquid film inside the ring to retain the liquid inside the ring, and then bringing the liquid film into contact with the object to be coated to cause the liquid inside the ring to adhere to the surface of the object to be coated.

(f) Examples of the invention The present invention will be described in detail below with reference to the drawings.

Figures 1 and 2 show a gas-filled detonator, which is an example of a product to which this coating method is applied.

In the figure, 1 and 2 are discharge electrodes made of Kovar material (iron-nickel-cobalt alloy), 3 is a cylindrical insulator made of ceramic, etc., and 4 is a discharge space.

This is a bipolar detonator, and when a voltage above a certain level is applied between electrodes 1 and 2, a discharge occurs and it functions to absorb the discharge, and is used to protect various electronic devices.

In such a lightning arrester, as shown in an enlarged view in FIG. 2, a liquid containing barium carbonate, ethyl alcohol, and ethyl ether is applied to the discharge surfaces 5 of the discharge electrodes 1 and 2 to stabilize the discharge state. A certain amount of coating is required.

As mentioned above, this application has conventionally been carried out using a dispenser, but the needle tends to become clogged, making it impossible to work efficiently.

FIGS. 3 and 4 show a ring member 6 which is a coating jig used in the coating method of the present invention. This ring member 6 is made of, for example, a round stainless steel wire with a diameter of about 0.5 mm and has a ring 7 with a diameter of about 4 mm at its end. It is formed in this way.

As shown in FIG. 4, the diameter of the ring 7 is such that when the ring 7 is immersed in a liquid and pulled up, a liquid film 8 is formed inside the ring 7 due to the surface tension of the liquid, and the liquid film 8 has a certain size. The dimensions are such that a film of liquid is applied.

Further, as shown in FIG. 3, the ring member 6 has a ring 7 and a grip portion 7a extending from the ring formed at a substantially right angle. In this ring member 6, a substantially constant amount of liquid film 8 adheres to the ring 7 each time, so that it is possible to stably form a liquid coating film of a constant amount and substantially uniform thickness.

FIG. 5 schematically shows the coating operation according to the present invention, and 9 is a container containing the above-mentioned mixed liquid 10 of barium carbonate, ethyl alcohol and ethyl ether.

Although not shown, stirring is performed using a magnetic stirrer to prevent the mixed liquid 10 in the container 9 from settling.

This operation involves moving a plurality of ring members 6 (three in the figure) in the direction of arrow A to move the ring 7 into the liquid 1.
After soaking in the water, pull it up in the direction of the vertical arrow
By depositing a liquid film 8 as shown in the figure and moving the ring member 6 in this state in the horizontal direction of arrow C and then moving it in the vertical direction of arrow D to bring the ring 7 into contact with the discharge surface 5 of the discharge electrode 12. A liquid film 8 is deposited on the discharge surface 5.

When the ring 7 comes into contact with the discharge surface 5 and the liquid film 8 is destroyed, the liquid can no longer be held within the ring due to surface tension and immediately spreads over the discharge surface 5.

After this, one cycle of the coating operation is completed by moving the ring member 6 in the opposite direction to that described above.

Incidentally, the above-mentioned product feeding by movement of the ring member 6 and horizontal movement of the discharge electrode 5 can be easily assembled as an automatic machine, and this work is actually accomplished by an automatic machine.

(g) Effects of the Invention According to the present invention, when the liquid film held in the ring comes into contact with the object to be coated and the liquid film is destroyed,
The surface tension of the liquid adhering to the inner wall of the ring can no longer hold the liquid, and a certain amount of liquid immediately adheres to the object to be coated, spreads, and is applied. In addition, in the present invention, the amount and area of the liquid to be applied can be easily adjusted by changing the outer diameter and wire diameter of the ring, and there is no clogging, resulting in good work efficiency and the ability to form a coating film stably and at low cost. , its practical effects are remarkable.

[Brief explanation of the drawing]

Figures 1 and 2 are a cross-sectional view of a gas-filled detonator, which is an example of a product to which this coating method is applied, and a perspective view of its discharge electrode, and Figures 3 and 4 show a ring member according to the present invention. A perspective view and a partial side sectional view, and FIG. 5 is a perspective view schematically showing a coating operation according to the present invention. [Explanation of symbols], 6...Ring member, 7...Ring, 8...Liquid film, 10...Liquid.

Claims (1)

[Scope of Claims] 1. Dipping the ring of a coating jig having a ring into the liquid to be coated, and then pulling it out of the liquid;
A liquid film is formed in the ring space by the surface tension of the liquid adhering to the inner wall of the ring, and the liquid is retained within the ring.Then, the liquid film is brought into contact with the object to be coated, and the liquid in the ring is spread onto the surface of the object to be applied. A method of applying a liquid, characterized by adhering it to. 2. Claim 1, wherein the object to be coated is a discharge electrode surface of a gas-filled detonator, and the liquid is a mixed liquid of barium carbonate, ethyl alcohol, and ethyl ether for stabilizing discharge. How to apply the liquid as described in section.