JP2003200127A - Method for rinsing face panel for color cathode ray tube and device for rinsing the panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent insufficient rinsing of glass and the generation of residual coating and inner face burn marks by selecting a solution and setting a rinsing condition for each rinsing position, while in the traditional method for rinsing the inner faces of a new face panel and a recycled face panel the same rinsing solution is used for rinsing both panels and thereafter the faces are washed in water, which results in problems including the generation of defects due to the insufficient rinsing of glass and, especially for the recycled face panel, the generation of the residual coating and the inner face burn marks due to a remained black light absorption layer or the like. <P>SOLUTION: The recycled face panel 18 is held with the inner face facing upward. On the inner face a 1-5 percent solution of acid ammonium fluoride containing tannic acid of 0.1-0.5% and polyacrylic acid of 10-20% is applied and then the face panel 18 is rinsed while slowly rotated. After the rinsing the rinsing solution is discharged out and the inner face of the face panel 18 is spray-cleaned while the inner face kept downward. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for cleaning a face panel for a color cathode ray tube, and in particular, it becomes a defective product at the stage of forming a black light absorption layer, and this product is again cleaned and reused. The present invention relates to a method and apparatus for cleaning a face panel for a color cathode ray tube, which is suitable for cleaning a reproduction face panel.

[0002]

2. Description of the Related Art Generally, a color cathode ray tube has a face panel 61 and a face panel 61 as shown in FIG.
Has a funnel-shaped funnel 62 joined to the inner surface of the face panel 61, and a phosphor screen 63 including a three-color phosphor layer and a black light absorbing layer is provided on the inner surface of the face panel 61. A shadow mask 65 attached to a mask frame 64 is arranged inside the face panel 61 facing the screen 63, and an inner shield 66 extending in the funnel 62 direction is also attached to the mask frame 64. Has been done. This phosphor screen 63 is a black matrix type in which a dot-shaped or striped three-color phosphor layer that emits blue, green, and red, and a black light absorption layer is provided in the gap between the three-color phosphor layers, or It is formed as a phosphor screen 63 called a black stripe shape.

On the other hand, the funnel 62 has a cylindrical neck 6
An electron gun 69 that emits three electron beams 68B, 68G, and 68R is arranged in the inside 7. The three electron beams 68B, 68G, 68 emitted from the electron gun 69
R is a deflection yoke 7 mounted on the outside of the funnel 62
The color image is reproduced and displayed on the phosphor screen 63 by deflecting by 0, selecting by the shadow mask 65, and horizontally and vertically scanning the phosphor screen 63.

The phosphor screen 63 of such a color cathode ray tube is manufactured through the following manufacturing process.

That is, a newly created face panel 6
1 or a defective product at the stage of forming the black light absorption layer, the inner surface of the face panel 61 is washed again to remove the black light absorption layer, and the reproduction is newly provided for forming the phosphor screen 63. A face panel 61 for use is prepared. The inner surface of each face panel 61 is degreased and washed, and a photosensitive agent is applied to the inner surface of the face panel 61 that has been degreased and washed to form a photosensitive film.
Through, and developed to form a resist having a matrix or stripe pattern at the phosphor layer forming position. Next, black paint is applied to the inner surface of the face panel 61 on which the resist is formed to form a black paint layer. Next, the black paint layer on this resist is peeled off together with the resist to form a matrix- or stripe-shaped black light absorbing layer.

What is determined to be a defective product at this stage is rotated as the reproduction face panel 61.

After that, a phosphor slurry containing a phosphor and a photosensitizer as a main component is applied to the gap between the black light absorption layers to form a phosphor slurry layer, and the phosphor slurry layer is passed through a shadow mask 65. It is exposed and developed into a phosphor layer, which is 3
The phosphor screen 63 is formed by repeating the color phosphor layer.

In order to clean the inner surface of the face panel 61 before forming the black light absorbing layer, as shown in FIG. 4, various cleaning and rinsing processes are performed. In FIG. 4, the left side of the drawing shows a state in which the cleaning solution and the washing water are sprayed from the nozzles to the inner surface of the face panel 61, and the right side of the drawing shows the solution and the like.

First, in the first position ((a) in the figure), the inner surface of the face panel 61 faces downward and faces the cleaning nozzle 71.
% Of hydrofluoric acid is sprayed to apply to the inner surface of the face panel 61 for cleaning. Next, the face panel 61 is, for example, 10
It is moved intermittently to the second position ((b) in the figure) every second. In this second position, the nozzle 72
From the above, water for washing is sprayed toward the inner surface of the face panel 61 to wash away the remaining black light absorbing layer and the washing solution. After that, it is moved to the third position ((c) in the figure), and again, 15% hydrofluoric acid is sprayed from the nozzle 73 to apply and wash, and then in the fourth position ((d) in the figure). The inner surface of the face panel 61 is washed by jetting water for washing from the nozzle 74 to wash out hydrofluoric acid.

The hydrofluoric acid used in this cleaning treatment has a high cleaning ability for the glass surface even at a low concentration, but when cleaning the black light absorbing layer, the portion where the black light absorbing layer is not formed, that is, the phosphor is used. From the non-black light absorbing layer portion where the glass surface on which the layer is to be formed is exposed, it enters the interface between the black light absorbing layer and the glass surface, and undergoes the process of rooting the black light absorbing layer. In order to clean the inner surface of the face panel 61 within the limited index time (8 to 30 seconds) during the process, it is necessary to use a high concentration of hydrofluoric acid.

When an acidic ammonium fluoride solution is used as a cleaning solution, it is possible for this solution to permeate the black light absorbing layer and directly act on it. Is not very expensive. For this reason, there is a possibility that defects may occur due to insufficient cleaning of the glass surface. Particularly in the case of the reproduction face panel 61 with the black light absorbing layer attached, film residue of the black light absorbing layer occurs,
Further, if the black light absorbing layer remains on the inner surface of the face panel 61 for too long, the etching of the inner surface of the glass by the cleaning solution progresses unevenly, and as a result, the unevenness of the inner surface of the face panel 61 becomes severe and the inner surface glares. (Inner burn) is a problem.

[0012]

As described above, reduction of harmful substances such as fluorides has become an urgent task, especially in recent years, from the viewpoint of environmental consideration. It is necessary to process it in a direction that avoids its use. However, in the cleaning treatment with hydrofluoric acid, it is necessary to use a high concentration of hydrofluoric acid. For this reason, the cleaning step with the cleaning solution is dispersed in two, and 15% concentration of hydrofluoric acid is used in each step. It is devised so that it will be processed.

That is, in both the new face panel 61 and the reproduction face panel 61, the inner surface of the face panel 61 is washed with hydrofluoric acid having a concentration of 15% at the first position,
In the case of the new face panel 61, the water washing process is performed at the next second position, but in the case of the reproduction face panel 61, the water washing process is not performed and the face face is held at that position. Next, in the third position, the inner surface of the face panel 61 is washed again with 15% concentrated hydrofluoric acid, and in the last fourth position, it is washed with water to obtain a clean inner surface of the face panel 61.

However, even if such a cleaning treatment is carried out, defects are caused due to insufficient cleaning of the glass, especially in the case of a reproduction face panel with a black light absorbing layer, a film residue of the black light absorbing layer or internal burning etc. Was having problems. Further, in the cleaning process at the first position, the inner surface of the face panel is arranged facing downward to clean the inner surface of the face panel. Therefore, when the supply amount of the cleaning solution is reduced or the concentration is lowered, the glass There is an increasing tendency for defects to occur due to insufficient cleaning of the surface.
Further, when the injection pressure of the cleaning solution is increased in order to shorten the processing time, the amount of liquid supplied to the inner surface of the face panel is inevitably increased, and the viscosity of the cleaning solution itself is about the same as water. Due to its high fluidity, this cleaning solution may be scattered to the outer surface of the face panel.If this cleaning solution splashes on the outer surface of the face panel, crater-like defects are generated in that area, and the quality is improved. There was a problem.

The present invention has been made in order to solve such a problem, and adds optimum cleaning conditions to each of a new face panel and a reproduction face panel, and particularly, the first reproduction face panel. In the washing stage,
An object of the present invention is to provide a cleaning treatment method and a cleaning treatment apparatus for a face panel for a color cathode ray tube, which can surely perform a cleaning treatment by holding and cleaning the inner surface of the face panel upward.

[0016]

According to the present invention, there is provided a method for cleaning a face panel for a color cathode ray tube, the method comprising a cleaning device and a water cleaning device for cleaning the inner surface of the face panel.
The cleaning solution is supplied from the cleaning device to the inner surface of the face panel, and the inner surface of the cleaned face panel is held downward after the cleaning solution is collected by rotating at a low speed to clean the inner surface, and the inner surface of the face panel is spray-cleaned by the water cleaning device. I decided to do it.

Further, a first cleaning solution supplying device for holding the inner surface of the face panel upward and supplying the cleaning solution to the inner surface of the face panel, and a rotating device for rotating the face panel at a low speed while keeping the cleaning solution. An oscillating device that rotates the face panel that has finished this rotation to discharge the cleaned solution in the face panel, and holds the inner surface of the face panel that has discharged the cleaned solution downward to spray-clean the inner surface of the face panel. The first cleaning device includes a first water cleaning device, a second cleaning device that cleans the inner surface of the washed face panel with a hydrofluoric acid cleaning solution, and a second cleaning device that spray-cleans the inner surface of the cleaned face panel. In the second stage, the inside of the face panel is held facing upward and washed with the cleaning solution, and in the second washing stage, the inside of the face panel is held facing downward. And configured to clean a washing solution Te.

According to such a cleaning treatment method and cleaning treatment apparatus, not only a new face panel but also a reproduction face panel in particular can reliably clean the inner surface of the face panel, resulting in defects. It is possible to obtain a face panel for a color cathode-ray tube that does not cause burns or internal burning.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method and apparatus for cleaning a face panel for a cathode ray tube according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an outline of a cleaning apparatus used for cleaning a face panel for a color cathode ray tube according to the present invention.

That is, in this cleaning processing device, the first cleaning solution supply device 11 is arranged at the first position to supply the cleaning solution to the face panel inner surface with the face panel inner surface facing upward, and rotate to the second position. An apparatus 12 is provided to perform a first cleaning process, and then a rocking device 13 is disposed at a third position to provide a first cleaning device 10 for collecting the cleaning solution after the cleaning process. There is. Furthermore,
In a state where the face panel is held so that the inner surface thereof faces downward, the first water washing device 1 is placed at the fourth position.
According to No. 4, the first washing process with water is performed.
The second cleaning device 15 is arranged at the fifth position to clean the inner surface of the face panel, and the second cleaning device 16 performs the cleaning process for finishing with the second cleaning device 16 at the sixth position.

In the first cleaning solution supply device 11 at the first position, a defective product is determined when a black matrix or black stripe type black light absorbing layer is formed.
The reproduction face panel 1 in a state where the black light absorbing layer 17 whose inner surface needs to be cleaned again is still attached to the inner surface.
8 is thrown in. The first cleaning solution supply apparatus 11 holds a table 19 that holds the face panel 18 to be fed in an upward state such that the inner surface thereof is 160 to 180 degrees with respect to the ground surface, and faces the table 19 surface. It is composed of a first cleaning solution tank 20 for storing a first cleaning solution and a nozzle 22 connected via a valve 21. After holding the inner surface of the reproduction face panel 18 on the table 19 in an upward state, 0.1 to 0.5% of tannic acid and 10 to 2 of polyacrylic acid are discharged from the first cleaning solution tank 20.
A washing solution containing 1% to 5% of ammonium acid fluoride containing 0% is dropped onto the inner surface of the face panel 18 through the valve 21 and the nozzle 22.

Thereafter, the face panel 18 is transferred to the rotating device 12 with the inner surface thereof facing upward. The rotary device 12 includes a rotary table 23 and the rotary table 2
3 is composed of a motor 24 for rotating.
Face panel 1 placed on the turntable 28
8 is rotated at a low speed in a state where the cleaning solution is stored on the inner surface, so that the cleaning solution is evenly and evenly distributed on the inner surface of the face panel 18, and is constantly flowing in the face panel 18. The inner surface of the face panel 18 is cleaned by being circulated. The face panel 18 that has been cleaned for a predetermined time is then transferred to the rocking device 13.

The swinging device 13 is provided with a pair of holding arms 25 that can be freely opened and closed, and holds the face panel 18 by the holding arms 25. That is, the holding arm 25 is rotated so that the inner surface of the face panel 18 is about 75 degrees with respect to the ground surface, and the cleaning solution (shown by 26 in the figure) after cleaning is discharged to the solution recovery tank 27. Face panel 18 from which this cleaning solution has been discharged
This time, the inner surface of the face panel 18 is directed downward so as to face the ground surface, and is transferred to the first water washing device 14 and arranged therein.

The transfer of the face panel 18 from the rotating device 12 in the second position to the first water washing device 14 in the fourth position can be performed by a series of operations of the rocking device 13 in the third position. That is, by the holding arm 25 of the swinging device 13, the rotary table 2 of the rotating device 12 is moved.
The holding panel 2 holds the face panel 18 whose inner surface is held in an upward state.
The face panel 18 is rotated together with 5, and is temporarily stopped at a position where the face panel 18 is rotated back and forth by 125 degrees on the way.
8. After discharging the cleaning solution 26 from the inner surface, the holding arm 25 may be further rotated again to be arranged at a predetermined position of the first water washing device 14 so that the inner surface of the face panel 18 faces downward. it can. If the cleaning solution 26 on the inner surface of the face panel 18 may flow out during this series of rotation operations, no problem will occur if the solution recovery tank 27 is formed wide correspondingly. Recovery of this cleaning solution 26 and face panel 1 between devices 12-14
8 can be transferred by using other methods than the illustrated method, for example, the holding arm 25 of the rocking device 13.
It is also possible to move the rotating device 12 and the first water washing device 14 in parallel to a predetermined position, and rotate the holding arm 25 at this intermediate stage to collect the washing solution 26. It is also possible to manually perform the series of operations.

In this manner, the face panel 18 whose inner surface is initially turned up at the time of throwing in is treated while being held in a downward state after the treatment from the first water washing device 14.

The first rinsing device 14 is provided with a first rinsing water tank 28 for storing pure water, and a spray nozzle 30 connected to this water tank via a valve 29. The face panel 18 transferred to the first water washing device 14 has the nozzle 30 so that the inner surface of the face panel 18 faces downward.
The cleaning solution 26 and the black light absorbing layer 17 remaining on the inner surface of the face panel 18 are retained by high-pressure cleaning the inner surface of the face panel 18 with pure water which is held at a position opposed to the nozzle 30. Wash away the waste. By this cleaning, almost new face panel 1
The quality is about the same as 8. The face panel 18 that has been washed in this way is transferred to the transfer device 31 that is configured by a conveyor.

The conveying device 31 is made of a large number of chemical resistant materials, and rubber rollers 32 having gears (not shown) at one end are arranged at a predetermined interval so as to form a line in the traveling direction. The gear of the rubber roller 32 is an endless chain 33.
Is meshed with. This chain 33 has a drive gear 34
Are engaged with each other, and a rotational force is applied to the chain 33 by rotating the gear 34 by a motor 35 to rotate the rubber roller 32.

Below the carrying device 31, the carrying device 3 is provided.
The second cleaning device 15 and the second cleaning device 15
The water washing device 16 is arranged at a predetermined interval.

The second cleaning device 15 is also provided with a second cleaning solution tank 36 for accommodating a cleaning solution composed of 10% hydrofluoric acid, and a spray nozzle 38 is provided in the cleaning solution tank 36 via a valve 37. Is provided. Similarly, the second washing device 16 is also provided with a second washing water tank 39, a valve 40 and a spray nozzle 41, and these nozzles 38, 41 are arranged so as to face the gap portion of the rubber roller 32. It is arranged.

Further, the valves 21, 29, 37, 40, and the motors 24, 3 constituting the cleaning processing device, respectively.
5, and the control unit 42 for the holding arm 25 of the rocking device 13
Is connected to a control circuit 43 such as a microcomputer, and the control circuit 43 controls each of them individually or in conjunction with each other.

In the transport device 31, the control circuit 43 controls the power supply of the motor 35 to turn it on and off to intermittently rotate the motor 35 at regular intervals, and accordingly, the chain 33 is intermittently driven to drive each rubber roller 32. Rotate intermittently. On the transfer device 31, the first water washing device 1
In step 4, the reproduction face panel 18 for which the first washing and washing process has been completed and the new face panel 18 whose inner surface is to be newly washed are loaded. At this stage, in a state where the new face panel 18 and the reproduction face panel 18 whose inner surface has been washed in the steps up to the first water washing device 14 are mixedly mounted,
The face panel 18 is sequentially placed in the same direction with the inner surface thereof facing downward so as to face the rubber roller 32 side. Of course, the new face panel 18 alone, the reproduction face panel 18 alone, or a predetermined number of groups may be grouped and mixedly mounted.

The new and remanufacturing face panels 18 placed on the transport device 31 are intermittently driven, for example, at intervals of 10 seconds and transported to the second cleaning device 15. This second
In the cleaning device 15, the valve 37 is opened based on the instruction of the control circuit 43, and the second cleaning solution tank 36 is discharged from the nozzle 38.
The cleaning solution inside is sprayed to apply the cleaning solution to the inner surface of the face panel 18 for cleaning.

After this cleaning is finished, the face panel 18 is transferred onto the second water washing device 16, and similarly, the valve 40 is opened based on the instruction of the control circuit 43, and the pure water from the water washing water tank 39 is discharged to the nozzle 41. The remaining cleaning solution that has been sprayed through is washed away, and the cleaning process for the inner surface of the face panel 18 is completed.

If necessary, the seventh position is set after the sixth position, and a drying device (not shown) for drying the inner surface of the face panel 18 by injecting dry air to the inner surface of the face panel 18 is arranged. It is also possible to do so.

Each valve 21, 29, 37, 40
The open time is controlled by the control circuit 43, and the rotation time of the motor 24 is also controlled. Further valve 37
And 40 are controlled by the control circuit 43 so as to be synchronized with the driving of the motor 35. In addition, the nozzle 2
The control of the injection from 2, 30, 38, 41 is performed by each device 1
Each tank 20, 2 arranged in 1, 14, 15, 16
It may be configured to control the side of a pressurizer (not shown) added to 8, 36 and 39.

A cleaning processing method using the cleaning processing apparatus thus constructed will be described in detail with reference to FIG.

In FIG. 2, the left side of the figure shows the outline of the operation for each device (position), and the right side of the figure shows the solutions and operations used.

That is, in the first cleaning solution supply device 11 (FIG. 11A) in the first position, in order to clean the black light absorption layer 17 remaining on the inner surface of the reproduction face panel 18, , 0.1 to 0.5% of tannic acid, which is a cleaning solution, and 10 to polyacrylic acid, on the inner surface of the face panel 18 which is placed 160 to 180 degrees upward with respect to the ground surface.
A 1 to 5% ammonium acid fluoride solution having a viscosity of 20% and a viscosity of 10 to 20 cps is dropped and supplied from a nozzle 22. At this time, it is possible to use the ammonium oxide fluoride solution as it is, but it is necessary to set the solution concentration to 5% or more in order to wash it within a predetermined processing time (for example, 8 to 30 seconds). There is.

Here, by adding tannic acid in an amount of 0.1 to 0.5%, the concentration of the acidic ammonium fluoride solution is increased to 1 to 1.
It can be reduced to 5%, and it is possible to perform cleaning without reducing the cleaning effect. It is speculated that this is because tannic acid roughens the surface of the black light absorption layer 17 and the acidic ammonium fluoride solution easily penetrates into the black light absorption layer 17. It was found that setting the mixing ratio of tannic acid to 0.5% is most effective, and that the effect is not particularly changed even if it is added more.

If 10 to 20% of polyacrylic acid is added, the viscosity of the cleaning solution can be set to 10 to 20 cps, and if the addition amount is 10% or less, the fluidity is too high and the solution may be scattered. If it is 20% or more, the viscosity becomes too high and the fluidity becomes poor. Therefore, it is preferable to use the washing solution within the range of 10 to 20%.

Next, the rotating device 12 in the second position
In the same figure (b), the face panel 18 is set to 15 rpm.
/ Min, the cleaning solution 26 is rotated at a low speed for about 10 seconds to flow through the inner surface of the face panel 18, so that the solution is evenly distributed in the face panel 18 and the black light absorbing layer 17 is peeled and dissolved. .

Then, the swinging device 13 is brought to the third position.
((C) in the figure), the face panel 18 is rotated back and forth by 125 degrees from the upward state to collect the washed processing solution 26 in the face panel 18 in the solution recovery tank 27.

Then, in the first water washing device 14 at the fourth position ((d) in the figure), with the inner surface of the face panel 18 facing downward, a flow rate of 4 L / min or more and a pressure of 0.7 MPa or more are applied. Then, pure water is sprayed from the flat nozzle 30 for spraying toward the inner surface of the face panel 18, and the inner surface of the face panel 18 is washed under high pressure.

Here, in the first washing device 14, the remaining film of the black light absorbing layer 17 and the washing solution remaining on the inner surface of the washed face panel 18 are washed out most effectively in order to sufficiently wash them away. 4L / that can be washed
The conditions were set such that the flow rate was min or more and the pressure was 0.7 MPa or more. In addition, in this washing with water treatment, deionized water called pure water is used to suppress the occurrence of glass defects. When city water, industrial water, or the like is used as this wash water, during the cleaning process in the next second cleaning device 15,
Alkaline earth metals such as calcium ions contained in city water and industrial water react with hydrofluoric acid used as a cleaning solution to form alkaline earth metal fluorides, which adhere to the inner surface of the face panel 18. This may cause glass defects. As a countermeasure against this, by using pure water and performing high-pressure cleaning, the remaining black light absorption layer film can be washed away, and black light generated due to insufficient cleaning It was confirmed that there was almost no film defect due to the residual absorption layer 17.

Subsequently, in the second cleaning device 15 ((e) in the figure) at the fifth position, hydrofluoric acid having a concentration of 10% is jetted from the nozzle 38 to the inner surface of the face panel 18 to clean the inner surface of the face panel 18. To do. In this cleaning step, since the cleaning is to finish the inner surface of the face panel 18, the concentration of hydrofluoric acid used for cleaning does not need to be particularly high, and 3% to 10% of hydrofluoric acid is used. It is sufficient that the concentration of hydrofluoric acid is around 5%.
Even if a high concentration of 0% or more of hydrofluoric acid is used, the cleaning ability is not so different, but the concentration is too high, which may cause an internal burn or an internal scratch of the face panel 18. There is.

Finally, in the second water washing apparatus 16 (6th position (f) in the figure), which is the sixth position, 4 L / from the nozzle 41.
Pure water with a flow rate of min and a pressure of 0.7 MPa is sprayed onto the inner surface of the face panel 18, and residuals of silica fluoride and the like generated by the reaction of foreign substances on the inner surface of the face panel 18 with hydrofluoric acid during cleaning with hydrofluoric acid The items are washed away, and the series of washing processes is completed. After that, the face panel 18 that has been subjected to this cleaning treatment is dried to be used for forming a phosphor screen.

Here, a comparison is made between a product in which a black light absorbing layer is formed on a face panel cleaned by the cleaning method according to the present invention and a comparative product in which a black light absorbing layer is formed by changing these processing conditions. Then, the effect was confirmed.

Working Example 1 A face processing apparatus was used in which the face panel was moved every 10 seconds to perform a cleaning process during the period in which the face panel was stopped at each position. Tannic acid 0.5% on the inner surface of the panel
And a 5% solution of ammonium acid fluoride containing 20% of polyacrylic acid was applied, and the face panel was held at the second position with the face panel held upward with 15
The inner surface of the face panel was washed by rotating it at a low speed of rpm / min, the face panel was tilted at 125 degrees in the third position to collect the washed solution, and the inner surface of the face panel was held downward in the fourth position. In this state, pure water having a flow rate of 4 L / min was sprayed at a pressure of 0.7 MPa for washing with water. Then, in the 5th position, 10% concentration of hydrofluoric acid is applied and washed, and in the 6th position, 0.7 M of pure water with a flow rate of 4 L / min is applied.
After the cleaning treatment of the inner surface of the face panel was completed by spraying with a pressure of Pa, a black light absorbing layer was formed on the inner surface of the face panel.

Product 2 A face processing apparatus was used in which the face panel was moved every 10 seconds to perform a cleaning process during the period in which the face panel was stopped at each position. Tannic acid 0.1% on the inner surface of the panel
And a 5% solution of ammonium acid fluoride containing 10% of polyacrylic acid are applied, and the face panel is held at the second position with the face panel held upward with the face panel 15 times.
The inner surface of the face panel was washed by rotating it at a low speed of rpm / min, the face panel was tilted at 125 degrees in the third position to collect the washed solution, and the inner surface of the face panel was held downward in the fourth position. In this state, pure water having a flow rate of 4 L / min was sprayed at a pressure of 0.7 MPa for washing with water. Then, in the 5th position, 10% concentration of hydrofluoric acid is applied and washed, and in the 6th position, 0.7 M of pure water with a flow rate of 4 L / min is applied.
After the cleaning treatment of the inner surface of the face panel was completed by spraying with a pressure of Pa, a black light absorbing layer was formed on the inner surface of the face panel.

Comparative product 1 A face processing apparatus was used in which the face panel was moved every 10 seconds to perform a cleaning process during the period in which the face panel was stopped at each position. Tannic acid 0.5% on the inner surface of the panel
5% solution of acidic ammonium fluoride containing was applied, and industrial water having a flow rate of 4 L / min was sprayed at a pressure of 0.7 MPa at the second position to wash and wash. After that, in the third position, 10% concentration of hydrofluoric acid is applied and washed, and in the fourth position, the flow rate is 4 L / m.
After finishing cleaning treatment of the inner surface of the face panel by spraying in pure water at a pressure of 0.7 MPa,
A black light absorbing layer was formed on the inner surface of this face panel.

The respective positions in the preparation stage of the comparative product correspond to the first to third positions in the case where the first position is the above-described product, and the second position is hereinafter referred to as the fourth position and the third position. Corresponds to the fifth position, and the fourth position to the sixth position.

Comparative product 2 A face processing apparatus was used in which the face panel was moved every 10 seconds to perform a cleaning process during the period in which the face panel was stopped at each position. Apply 15% hydrofluoric acid solution to the inner surface of the panel, hold it as it is at the second position, and apply 15% hydrofluoric acid solution at the third position to wash it.
At the fourth position, pure water having a flow rate of 4 L / min was sprayed at a pressure of 0.7 MPa to complete the cleaning treatment of the inner surface of the face panel, and then a black light absorbing layer was formed on the inner surface of the face panel.

Comparative product 3 A face processing apparatus was used in which the face panel was moved every 10 seconds to perform a cleaning process during the period in which the face panel was stopped at each position. Tannic acid 0.1% on the inner surface of the panel
1% solution of ammonium acid fluoride is applied, and at the second position, 0.2 L of pure water with a flow rate of 1 L / min is applied.
It was sprayed at a pressure of MPa and washed with water. Then, in the third position, a 10% hydrofluoric acid solution is applied and cleaned, and in the fourth position, pure water with a flow rate of 4 L / min is sprayed at a pressure of 0.7 MPa to clean the inner surface of the face panel. After finishing, the black light absorbing layer was formed on the inner surface of the face panel.

Comparative product 4 A face processing apparatus was used in which the face panel was moved every 10 seconds to perform a cleaning process during the period in which the face panel was stopped at each position. A 5% solution of acidic ammonium fluoride was applied to the inner surface of the panel, and at the second position, pure water with a flow rate of 4 L / min was sprayed at a pressure of 0.7 MPa for washing with water. After that, in the third position, 1
After the 0% hydrofluoric acid solution is applied and washed, and in the fourth position, pure water with a flow rate of 4 L / min is sprayed at a pressure of 0.7 MPa to complete the washing treatment of the inner surface of the face panel. A black light absorbing layer was formed on the inner surface of the face panel.

These execution products 1 and 2 and comparison products 1 to 4
In the above, 1000 new face panels and 500 face panels for reproduction were prepared, washed by each method, and a black light absorbing layer was formed on the inner surface of each face panel after the washing treatment. The occurrence rate of the film defect of the black light absorption layer of No. 1 and the occurrence rate of those which were judged to be defective due to severe internal glare were investigated. The results of the investigation are shown in Table 1.

[Table 1] As can be seen from Table 1, in the case of the practical product 1, neither the film defect due to the black light absorbing layer nor the internal surface glare was observed in the new face panel. Even in the case of the reproduction face panel, the film defect due to the black light absorption layer remaining was found to be 0.02%, but it was suppressed to a state where there was almost no problem, and no internal glare was found. Further, in the case of the embodiment 2, both the new face panel and the reproduction face panel had some film defects due to the residual black light absorption layer of 0.03% and 0.06%, but the number of them is a problem. No, and neither internal glare occurred. Furthermore, no dent was observed due to the scattering of the cleaning solution to the outer surface of the face panel.

On the other hand, in Comparative Products 1 to 4,
Both the new face panel and the reproduction face panel have a film defect due to the black light absorption layer remaining, and even if the film defect is relatively small, the inner surface is glaring and the cleaning process is sufficient. It is hard to say that it is being done. In particular, in the case of the reproduction face panel of Comparative product 3, the black light absorption layer formed in the previous stage which became defective was not sufficiently removed by washing, and the majority thereof remained. Was there.

As described above, the cleaning treatment method by the cleaning treatment apparatus according to the present invention was used to clean the new face panel and the recycled face panel, and the defective rate was far higher than that of the comparative product. Is low, and you can see how efficiently and surely it is cleaned. Moreover, all or most of these cleaning apparatuses can be assembled as an automated line, which is suitable for labor saving.

The present invention is not limited to the above-described embodiment, and for example, the conveying means for moving the face panel is not limited to chain drive, but may be gear drive or belt drive. The case where the transport device is configured to be easy to understand so that the transport device is set from this position in order to mix the new product and the reproduction face panel at the second cleaning device position has been described. It is also possible to extend it to the device position, and if it is to be fully automated, extend this transfer device to the position of the first cleaning solution supply device and use a special device such as a rotating device or a rocking device. By taking measures such as removing the rubber roller only at the place where the operation is performed, it is possible to configure the entire line with a single or combined transport device. It is needless to say is possible.

[0060]

As described above, according to the present invention,
In the first cleaning process step, the inner surface of the face panel faces upward, and in the second cleaning process, the inner surface of the face panel faces downward, and the cleaning solution used in each cleaning step is set to the most effective solution. By doing so, it is possible to obtain a face panel that suppresses the generation of high-concentration harmful substances and further suppresses the occurrence of film defects due to glare on the inner surface of the face panel and insufficient cleaning.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view for explaining a cleaning processing apparatus for a face panel for a color cathode ray tube according to the present invention.

FIG. 2 is an explanatory diagram for explaining a method of cleaning a face panel for a color cathode ray tube according to the present invention.

FIG. 3 is a sectional view showing the structure of a conventional color cathode ray tube.

FIG. 4 is an explanatory diagram for explaining a conventional method for cleaning a face panel for a color cathode ray tube.

[Explanation of symbols]

10: First cleaning device 11: First cleaning solution supply device 12: Rotating device 13: Swing device 14: First water washing device 15: Second cleaning device 16: Second water washing device 18: Face panel

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI theme code (reference) C11D 7/60 C11D 7/60 H01J 9/38 H01J 9/38 AF term (reference) 3B116 AA23 AB14 AB33 AB47 BB02 BB22 BB90 CC01 CD22 CD41 3B201 AA23 AB14 AB33 AB47 BB02 BB22 BB90 BB92 CC01 CD22 CD41 4H003 DA15 DB01 DC01 EA22 EA23 EB30 EB46 5C012 AA02 BD04

Claims (7)

[Claims] 1. A method for cleaning a face panel for a color cathode ray tube, wherein the inner surface of the face panel is cleaned through a cleaning device and a water cleaning device, wherein the inner surface of the face panel is held upward.
The cleaning solution is supplied from the cleaning device to the inner surface of the face panel, and the inner surface of the cleaned face panel is held downward after the cleaning solution is collected by rotating at a low speed to clean the inner surface, and the inner surface of the face panel is spray-cleaned by the water cleaning device. A method for cleaning a face panel for a color cathode ray tube, comprising: 2. Tannic acid 0.1 as the cleaning solution
The method for cleaning a face panel for a color cathode ray tube according to claim 1, wherein a 1 to 5% ammonium acid fluoride solution containing 0.5 to 0.5% and polyacrylic acid 10 to 20% is used. 3. The washing device and the water washing device include first and second washing devices and first and second water washing devices, respectively, and the washing and the water washing are performed alternately and selectively. In the first cleaning device, the cleaning solution is used for cleaning, then in the first water cleaning device, pure water is used for high-pressure spray cleaning, and in the second cleaning device, 3-10% hydrofluoric acid cleaning solution is used for cleaning. 3. The method for cleaning a face panel for a color cathode ray tube according to claim 1, further comprising high-pressure spray cleaning with pure water in a second water cleaning device. 4. The high pressure spray cleaning is 4 L / min.
4. The method for cleaning a face panel for a color cathode ray tube according to claim 1, wherein the pure water having the above flow rate is applied at a pressure of 0.7 MPa or more. 5. A first cleaning solution supply device that holds the inner surface of the face panel upward and supplies the cleaning solution to the inner surface of the face panel, and a rotating device that rotates the face panel at a low speed while holding the cleaning solution. An oscillating device that rotates the face panel that has finished this rotation to discharge the cleaned solution in the face panel, and holds the inner surface of the face panel that has discharged the cleaned solution downward to spray-clean the inner surface of the face panel. A first water washing device; a second washing device for washing the inner face of the face panel washed with water with a hydrofluoric acid washing solution; and a second water washing device for spray washing the inner face of the washed face panel. In the cleaning step, the inside of the face panel is held facing upward and cleaned with the cleaning solution, and in the second cleaning step, the inside of the face panel is held facing downward. And a cleaning solution for cleaning the face panel for a color cathode ray tube. 6. The cleaning solution supplied from the cleaning solution supply device is ammonium acid fluoride 1-0.1% containing tannic acid 0.1-0.5% and polyacrylic acid 10-20%.
6. A cleaning process for a face panel for a color cathode ray tube according to claim 5, wherein a 5% solution is used, and a hydrofluoric acid solution having a concentration of 3 to 10% is used as a cleaning solution used in the second cleaning device. apparatus. 7. In the first and second water washing devices,
7. Pure water having a flow rate of 4 L / min or more is washed under high pressure at a pressure of 0.7 MPa or more.
A cleaning device for a face panel for a color cathode ray tube as described above.