JPH0393131A - Washing device for shadow mask and method of washing same - Google Patents

Abstract

PURPOSE:To prevent deformation of a shadow mask which coours during its washing process by forcedly cooling it after it is slowly cooled. CONSTITUTION:A shadow mask dried with hot air is first cooled gradually at a gradually cooling tunnel part 3, and then the temperature of a support frame 7 is cooled below 80 deg.C, for example, with air at 20 deg.C, keeping the temperature of the shadow mask 7 to be within 60 deg.C at which deformation in the shadow mask 7 and the support frame is not caused. The support frame below 80 deg.C is forcedly cooled in this way, and deformation in the shadow mask 7 hardly occurs even if cooling is performed in this forcible cooling process 4 so that the temperature at the shadow mask 7 and the taking-out port of the support may be below 40 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning device and a cleaning method for a shadow mask used in a power-2 cathode ray tube.

[Conventional technology]

The shadow mask is cleaned by a cleaning device while fixed to the support frame (Japanese Patent Laid-Open No. 117239/1983)
(see publication).

Conventional shadow mask cleaning is performed by suspending the shadow on a conveyor and sequentially conveying it to an ultrasonic cleaning section, a hot air drying oven, and a cooling section. That is, the shadow mask suspended on the conveyor in the supply section is first sent to the ultrasonic cleaning section,
It is cleaned by being irradiated with ultrasonic waves of heated pure water, and when it is pulled out of the pure water, it is rinsed with pure water and placed in a hot air drying oven. In the hot air drying oven, the attached water is blown off by high pressure hot air and the material is dried. The dried shadow mask is cooled by a cooling unit that blows cooling air onto both sides of the shadow mask. The cooled shadow mask is sent to the outlet by a conveyor and removed.

[Problem to be solved by the invention]

A shadow mask generally has a plate thickness of Q, 15 m, has many holes over its entire surface, and has a very small heat capacity. For this reason, the temperature of the shadow mask itself is easily influenced by the outside air temperature, and when wind is blown onto it, it instantly reaches the temperature of the wind. On the other hand, the support 7 frame that holds the shadow mask generally has a plate thickness of 1.0 to 2.3 mm, has a very large heat capacity compared to the shadow mask, and its temperature does not change easily.

In the above-mentioned conventional technology, cooling is performed after hot air drying, so if the cooling rate is increased, a large temperature difference is generated between the shadow mask and its support 7 frames having different heat capacities, and the shadow mask is deformed. Conventionally, the cooling rate is slowed down to prevent the shadow mask from deforming, so the temperature of the support frame at the outlet of the cleaning device is high, making it difficult to handle manually, and it cannot be used immediately for other processes. The problem was that it was difficult to do.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shadow mask cleaning device and cleaning device that can prevent deformation of a shadow mask during a cleaning process and facilitate handling of the shadow mask after removal and use in other processes. The purpose is to provide a method.

[Means to solve the problem]

In order to achieve the above object, the cleaning device was provided with a slow cooling tunnel section that supplied a breeze to the shadow mask between the hot air drying oven and the forced cooling tunnel section.

In addition, the cleaning method is such that between the hot air drying process and the forced cooling process,
A slow cooling step was provided in which the support frame was slowly cooled to a temperature of 80° C. or lower using a breeze.

Furthermore, in the forced cooling tunnel section, cooling air was designed to flow from the outlet side to the inlet side to reduce sudden temperature changes.

[Effect]

The shadow mask that has been dried with hot air is first slowly cooled in the slow cooling tunnel section, so the temperature difference between the shadow mask and the support frame is likely to cause deformation of the shadow mask. temperature to 80
It can be cooled to below 0.degree. C., for example, using air at 20.degree.

The support frame, which has become below 80°C, is then forcedly cooled, so in this forced cooling process, even if the temperature at the outlet of the shadow mask and support is cooled to below 40°C, the shadow mask will not deform. It's hard to wake up.

In this forced cooling, when the cooling air is flowed in the opposite direction to the conveyance direction of the shadow mask, the temperature gradient of the cooling air is lower on the exit side than on the inlet side, so sudden temperature changes are reduced.
It can be cooled more effectively.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. An ultrasonic cleaning section 1 using pure water, a hot air drying oven 2, a slow cooling tunnel section 3, and a forced cooling tunnel section 4 are arranged in this order.
A shadow mask 7 is suspended and conveyed to each of these parts 1 to 4 by a conveyor 6 that is driven intermittently in the direction of arrow 5.

The shadow mask 7 is fed into the conveyor 6 in the supply section 6a, suspended D, and first enters the ultrasonic cleaning section 1. The ultrasonic cleaning section 1 is broadly composed of a pure water tank filled with pure water and a cover that collects steam generated from the pure water so as not to scatter it into the room.

The pure water tank is provided with ultrasonic vibrators on both sides where the shadow mask 7 and a heater that heats the pure water to 50 to 85°C are in contact. Further, a spray rinsing unit is provided at a portion where the shadow mask 7 is lifted out of the pure water. Further, the steam collected by the cover is forcibly discharged to the outside from the exhaust port 1a. 1b indicates the window.

Therefore, the shadow mask 7 is cleaned by ultrasonic irradiation with pure water heated to 50 to 85° C. while passing through a pure water tank. When the washed shadow mask 7 is pulled up from the pure water, it is rinsed with clean pure water and then enters the next hot air drying oven 2.

High pressure hot air (0.5~2/d, 80~130°C) is supplied into the hot air drying oven 2 from the outside by a hot air generator (not shown), and this 80~130°C
A fan is installed to circulate hot air. Therefore,
The water adhering to the shadow mask 7 is dried while being blown off with high-pressure hot air, and then the shadow mask 7 is dried with hot air of 80 to 130°C circulated by a fan. Note that the humid hot air is forcibly discharged from the exhaust port 2a.

The dried shadow mask 7 enters the next slow cooling tunnel section 3. In the slow cooling tunnel section 3, the temperature inside the tunnel is set to 20~
A breeze is supplied to maintain the temperature at 60° C., and the shadow mask 7 is gradually cooled in this slow cooling tunnel section 3 until the temperature reaches 80° C. or less.

Moreover, the high temperature air is exhausted from the exhaust port 3a.

The shadow mask 7 that has exited the slow cooling tunnel section 3 enters the next forced cooling tunnel section 4. The forced cooling tunnel portion 4 is provided with an inlet 4a on the outlet side for forcibly supplying cooling air, and an outlet 4b on the inlet side for discharging the cooling air. Therefore, the shadow mask 7 is rapidly cooled by the cooling air while moving within the forced cooling tunnel section 4. In this case, since the cooling air flows from the exit side to the entrance side of the forced cooling tunnel section 4, the shadow mask 7 is cooled while reducing sudden temperature changes, and is cooled to below 40°C by the time it reaches the outlet 6b. can be done.

The shadow mask 7 that has exited the forced cooling tunnel section 4 is taken out from the conveyor 6 at the takeout port 6b.

tx Oh, in the above embodiment, the case where the shadow mask is immersed in heated pure water in a tank and irradiated with ultrasonic waves for cleaning is explained as the cleaning part 1. You can.

〔Effect of the invention〕

According to the present invention, since forced cooling is performed after slow cooling, cooling can be performed while controlling the temperature difference between the shadow mask and the support frame, which have different heat capacities, to within 60° C. without causing any change in the shadow mask. In addition, while preventing deformation of the shadow mask, it is easy to handle the shadow mask and support frame before reaching the extraction port.
It can be cooled to a temperature where it can be used immediately for the next process.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing one embodiment of the present invention. 1... Ultrasonic cleaning section, 2... Hot air drying oven, 3
...Slow cooling tunnel part, 4...Forced cooling tunnel part, 4a...Blowing port, 4b...
Discharge port, 6...conveyor, 7...shadow mask. Figure 4: Strong #I'J tunnel switch 6: Combe 7 7: Shatton mask

Claims (1)

[Scope of Claims] 1. A cleaning unit that cleans the shadow mask with heated pure water, a hot air drying oven that blows heated high-pressure air and hot air onto the washed shadow mask to drain and dry it, and a breeze blows onto the dried shadow mask. A slow cooling tunnel section for supplying
A shadow mask cleaning device comprising a forced cooling tunnel section that supplies cooling air to a slowly cooled shadow mask, and a conveyor that suspends the shadow mask and sequentially conveys it to each of the surfaces. 2. A cleaning process in which the shadow mask is washed with pure water heated to 50-85℃, and 0.5-2Kg/cm^3 and 8
A hot air drying process involves blowing away the water adhering to the shadow mask using high-pressure hot air at 0 to 130 degrees Celsius, and then drying it with hot air at 80 to 130 degrees Celsius. A method for cleaning a shadow mask, which comprises a slow cooling step in which the shadow mask and support frame are cooled slowly until the temperature reaches a certain temperature, and a forced cooling step in which the shadow mask and support frame are forcibly cooled with cooling air so that the temperature of the shadow mask and support frame becomes 40° C. or less at the outlet of the shadow mask.