JPH09215902A - Method for deforming high viscosity material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To defoam a high viscosity material in a short time by a method in which the material is placed in a cylindrical container, and the container is rotated with its central axis kept horizontal to defoam the material. SOLUTION: In the defoaming of frit glass slurry 13 which is used for joining a color-CRT panel to a funnel, the slurry 13 is placed in a container 12 consisting of bottomed cylindrical main body and a lid. The container 12 is placed on a pair of rollers 16a, 16b of a roller apparatus, the roller 16a is rotated by a motor to rotate the container 12. In this process, most of the slurry 13 in the container 12 is retained in the lower part of the container 12 by its own weight, and the speed of the motor is controlled by a control unit so that part of the slurry 13 forms a thin layer 23 which is elongated along the inside wall of the container 12. In this way, foam 24 in the thin layer 23 can be removed in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for defoaming a high-viscosity substance, and more particularly to a high-viscosity substance effective for removing bubbles from a frit glass slurry used for joining a panel of a color cathode ray tube and a funnel. Defoaming method.

[0002]

2. Description of the Related Art Generally, a color CRT has a glass panel having a phosphor screen made of a phosphor layer of three colors formed on the inner surface thereof, and a shadow mask attached to the phosphor screen, and a conductive film on the inner surface. After joining the funnel-shaped glass funnel formed by coating and sealing the electron gun in the neck of the funnel, vacuum exhaust the inside of the enclosure consisting of the panel and the funnel joined together. Manufactured by.

The panel and the funnel are joined to each other by adding a binder solution in which nitrocellulose is dissolved in a solvent such as isoamyl acetate or butyl acetate to fine particles of frit glass and stirring the mixture to uniformly mix the frit glass slurry. The frit glass coating layer is formed by coating on the sealing surface with the panel (the end surface of the large diameter portion), the panels are arranged facing each other with the frit glass coating layer interposed therebetween, and then the panel and the funnel are heated. .

However, as described above, the binder solution is added to the fine particles of the frit glass and the mixture is stirred to form the frit glass.
When the slurry is mixed, air bubbles are entrained in the frit glass slurry, and the air bubbles are applied to the sealing surface of the funnel together with the frit glass, which deteriorates the atmospheric pressure resistance of the vacuum envelope. Further, as shown in FIG. 4, the metal back 5 of the phosphor screen 4 to which a high voltage is applied, the conductive film 6 on the inner surface of the funnel 2 and the like are located close to the joint 3 between the panel 1 and the funnel 2. Therefore, the inner surface side of the bonding portion 3 is charged with a high potential. Therefore, there arises a problem that the withstand voltage characteristic of the joint portion 3 is deteriorated.

Therefore, the compounded frit glass slurry needs to be degassed before being applied to the sealing surface of the funnel. As the defoaming treatment, there are methods of forced defoaming such as vacuum defoaming as well as natural defoaming.

Of the defoaming treatments, defoaming by leaving it to stand naturally is a method of waiting for the bubbles in the frit glass slurry to reach the surface by buoyancy, and therefore removing the nitrocellulose from the frit glass particles. When the viscosity of the frit glass slurry is reduced by adding a binder solution having a low content rate, defoaming can be performed in a relatively short time, but a binder solution with a high content rate of nitrocellulose relative to frit glass fine particles. If the viscosity of the frit glass / slurry is increased by adding the above, defoaming requires a long time. Regarding vacuum degassing, it is necessary to take measures to dry the frit glass and slurry, and each has its advantages and disadvantages.

[0007]

As described above, there are a defoaming method of the frit glass slurry and a method of defoaming by leaving it naturally and a method of forcibly defoaming. Regarding the defoaming by leaving it naturally, defoaming can be done in a relatively short time if the viscosity of the frit glass / slurry is low, but if the viscosity of the frit glass / slurry is high, the defoaming time Takes. Also, in vacuum defoaming to forcefully defoam,
It is necessary to take measures to dry the frit glass and slurry, and each has its advantages and disadvantages.

The present invention has been made in view of the above problems, and an object thereof is to obtain a defoaming method for removing bubbles contained in a high-viscosity substance such as high-viscosity frit glass slurry in a short time. To do.

[0009]

In a method for defoaming a high-viscosity substance, the high-viscosity substance is contained in the high-viscosity substance by putting the high-viscosity substance in a cylindrical container and rotating the cylindrical container with its central axis substantially horizontal. The generated bubbles were defoamed.

Further, the high-viscosity substance in the cylindrical container is rotated at a rotation speed such that the highly viscous substance is thinly spread on the inner wall surface of the cylindrical container.

Further, a high-viscosity substance is put into the cylindrical container in an amount of 1/2 or less of the volume of the cylindrical container, and the cylindrical container is rotated.

Further, the high-viscosity substance is a mixture of fine particles of frit glass and a binder solution.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, defoaming of a frit glass slurry used for joining a panel of a color cathode ray tube and a funnel will be described as an embodiment of the present invention with reference to the drawings.

The frit glass slurry used for joining the panel of the color cathode ray tube and the funnel is a fine particle of the frit glass, and a binder solution prepared by dissolving nitrocellulose in a solvent such as isoamyl acetate or butyl acetate is added and stirred. It is prepared by uniformly mixing, and a large number of air bubbles are entrained in the frit glass slurry due to the stirring during the preparation.

In order to remove the air bubbles entrained during the preparation, in the embodiment of the present invention, the prepared frit glass slurry is provided with a bottomed cylindrical main body 10 as shown in FIG. A lid 1 for liquid-tightly sealing the opening of the main body 10
Put in a container 12 consisting of 1. The amount of the frit glass slurry 13 charged in the container 12 is set to 1/2 or less of the internal volume of the container.

Next, the frit glass slurry 13
The container 12 containing is rotated by the rotating roller device 15 shown in FIG.

The rotary roller device 15 includes a pair of rollers 16a and 16b rotatably supported in parallel, one roller 16a of which is attached to pulleys 17 and 18 and a belt 19 which is wound around these pulleys 17 and 18. It has a motor 20 that is rotationally driven via a motor and a control unit 21 that controls the rotation speed of the motor 20. The container 12 is rotated by placing the container 12 containing the frit glass slurry on the pair of rollers 16a and 16b so that the central axis Z is substantially horizontal, and rotating one roller 16a by the motor 20. It is done by.

In this case, as shown in FIG. 3, most of the frit glass slurry 13 in the container 12 is retained under the container 12 which rotates due to its own weight, and a part of the frit glass slurry 13 is contained in the container 12. The control unit 21 controls the rotation speed of the motor 20 so as to form the thin layer 23 that is thinly stretched along the inner wall of the. That is, the container 12
The container 12 is rotated at a low speed so that the frit glass slurry rolled up with the rotation of the container does not collapse and trap air, and forms a thin layer 23 that is thinly stretched along the inner wall of the container 12. To rotate.

In this way, the frit glass slurry 13 is put in the cylindrical container 12, the charge amount thereof is set to 1/2 or less of the internal volume of the container 12, and the container 12 containing the frit glass slurry 13 is Part of the frit glass slurry 13 is retained at the bottom of the container 12 and part is
When rotating at a low speed so as to form the thin layer 23 along the inner wall of the container 12, the bubbles 24 mixed in the thin layer 23 from the thin layer 23 thinly stretched along the inner wall of the container 12 are quickly Can be removed. Therefore, low viscosity frit glass
Not only the slurry but also the high-viscosity frit glass slurry which has been difficult to be degassed can be degassed in a short time without changing the composition.

If the frit glass slurry 13 is put in more than ½ of the inner volume of the container 12, the area of the thin layer 23 formed along the inner wall of the container 12 when the container 12 is rotated. Becomes smaller, which is not preferable.

In the above embodiment, the case where the bubbles are naturally removed from the thin layer thinly stretched along the inner wall of the container by the rotation of the container has been described. By adding other means such as adding or heating to reduce the viscosity of the frit glass slurry inside, it becomes possible to defoam more quickly.

Further, in the above embodiment, the container is rotated by the rotating roller device having a pair of rollers, but the container may be rotated by a device other than the rotating roller device.

Further, in the above embodiment, the case where the bubbles contained in the frit glass slurry used for joining the panel of the color cathode ray tube and the funnel are removed has been described. However, the present invention is not limited to the frit glass slurry. It can also be applied to defoaming high viscosity substances.

[0024]

The high-viscosity substance is placed in a cylindrical container, and when the cylindrical container is rotated, the rotational speed of the cylindrical container is adjusted so that the high-viscosity substance in the cylindrical container is thinly spread on the inner wall surface. By controlling, the bubbles contained in the high-viscosity substance can be defoamed in a short time.

[Brief description of drawings]

FIG. 1 is a view showing a structure of a container used for defoaming frit glass slurry according to an embodiment of the present invention.

2 (a) and 2 (b) are diagrams showing a configuration of a rotary roller device used for rotating the container. FIG.

FIG. 3 is a diagram for explaining defoaming obtained by rotating a container.

FIG. 4 is a diagram showing a configuration of a color CRT.

[Explanation of symbols]

 12 ... Container 13 ... Frit glass / slurry 15 ... Rotating roller device 23 ... Thin layer 24 ... Air bubbles

Claims (4)

[Claims] 1. A high-viscosity substance is placed in a cylindrical container and the cylindrical container is rotated with its central axis substantially horizontal to remove bubbles contained in the high-viscosity substance. Defoaming method for highly viscous substances. 2. Detachment of the high-viscosity substance according to claim 1, wherein the high-viscosity substance of the cylindrical container is rotated at a rotation speed such that the high-viscosity substance of the cylindrical container is thinly spread on the inner wall surface of the cylindrical container. Foam method. 3. The high-viscosity substance according to claim 1, wherein the high-viscosity substance is put in the cylindrical container in an amount of ½ or less of the volume of the cylindrical container and the cylindrical container is rotated. Defoaming method. 4. The method for defoaming a high-viscosity substance according to claim 1, wherein the high-viscosity substance is a mixture of fine particles of frit glass and a binder solution.