JP2000173473A - Separation method of funnel and panel of cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple, low-cost, safe and reliable method of separating a cathode ray tube in which a funnel and a panel are fused by frit glass into a funnel and a panel at a fusion portion. provide. SOLUTION: After removing part or all of the frit glass exposed to the outside by applying a mechanical external force, a hot liquid and a cold liquid are indirectly applied to a cathode ray tube via a sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method of separating a cathode ray tube in which a funnel and a panel are integrated with frit glass into a funnel and a panel.

[0002] The present invention also relates to an apparatus for removing frit glass from a cathode ray tube, which can be suitably used as a pretreatment apparatus when performing the above separation method.

[0003]

2. Description of the Related Art From the viewpoint of effective utilization of resources, the importance of recycling raw materials used in various apparatuses is increasing day by day. This is no exception for cathode ray tubes,
Various methods have been proposed for collecting and pulverizing used cathode ray tubes to be disposed of, and reusing the ground glass as glass for a new cathode ray tube.

FIG. 6 shows a schematic structure of a general cathode ray tube. FIG. 6A is a side view showing a schematic configuration of a general cathode ray tube, and FIG. 6B is a partially enlarged sectional view of a portion I in FIG. 6A.

As shown in the figure, the cathode ray tube 100 has a funnel 110 and a panel 120 having a panel surface 121 on which an image is displayed. The funnel 110 and the panel 120 are joined and integrated by fusing a frit glass (solder glass) 130 over the entire circumference. As shown in FIG. 6B, the frit glass 130 is formed to protrude inside and outside the cathode ray tube.

The funnel glass constituting the funnel 110 contains a predetermined amount or more of lead for the purpose of improving the X-ray absorption characteristics. Similarly, frit glass also contains a certain amount of lead. On the other hand, in the panel glass constituting the panel 120, the content of the lead component is strictly controlled to a certain amount or less for the purpose of obtaining a clear image and the like.

Accordingly, when the glass constituting the cathode ray tube is collected and reused again as the glass for the cathode ray tube,
It is necessary to prevent the ground material of the funnel glass and the frit glass from being mixed in the recycled material for the panel glass so that the panel glass does not contain a lead component. Also,
In order to make the content of the lead component in the funnel glass equal to or more than a predetermined amount, it is necessary to keep the amount of the crushed product of the panel glass in the recycled material for the funnel glass below a certain value. Therefore, after separating the funnel and the panel, it is necessary to grind them separately.

Various methods have conventionally been proposed as a method for separating the funnel and the panel of such a cathode ray tube.

Japanese Patent Application Laid-Open No. Hei 1-194239 discloses that a cathode ray tube is immersed in a nitric acid solution to dissolve frit glass, and then a hot shock and a cold water are alternately showered to give a thermal shock to the funnel and the panel. A method for separating is disclosed.

Japanese Patent Application Laid-Open No. 7-29496 discloses that
Scratch the corners of the cathode ray tube, preferably the four corners on the panel side than the frit glass part, arrange heating wires with tension applied to the four sides of the panel so as to sandwich the scratches from both sides. A method is disclosed in which the glass is expanded by heating, and the cathode ray tube is divided at the wound.

Japanese Patent Application Laid-Open No. Sho 62-208525 discloses a method of detecting a joint portion made of frit glass, cutting the detected portion around the entire circumference using a cutting cutter, and separating the portion.

JP-A-5-151898 relates to a method of dividing a cathode ray tube in which a reinforcing band made of a conductive member is wound around the welded portion of a panel and a funnel. There is disclosed a method of causing thermal distortion in a welded portion to separate a panel from a funnel.

[0013]

However, the above-mentioned conventional separation methods have the following problems.

In the method disclosed in JP-A-1-194239, it is necessary to safely control the nitric acid solution. In addition, it is necessary to consider the impact on the environment due to wastewater and sludge generated in the process. That is, the method has problems in safety and equipment cost.

In the method disclosed in Japanese Patent Application Laid-Open No. Hei 7-29496, the image is divided at the location where the damage is made. Therefore, if the panel portion is damaged, the panel portion is divided at the panel portion, and thus the panel glass is divided with a part of the panel glass attached to the funnel side.
As a result, the panel glass having a low lead content is mixed in the recycled material for the funnel glass, and the lead component content in the recycled material for the funnel glass is reduced. On the other hand, if the funnel portion is divided at the funnel portion, the funnel glass is mixed into the recycled raw material for the panel glass and contains a lead component. In order to avoid these problems, even if an attempt is made to divide the frit glass at the frit glass, it is difficult to separate the frit glass at the frit glass just to the extent that it is scratched.

According to the method disclosed in Japanese Patent Application Laid-Open No. 62-208525, it is possible to divide at the frit glass portion, but a sensor for detecting the frit glass portion, a cutter for cutting, and driving into the cutting portion until the cutting is completed. Since a wedge-shaped driving tool or the like is required, the equipment becomes complicated and the equipment cost increases.

In the method disclosed in Japanese Patent Application Laid-Open No. 5-151898, only a cathode ray tube having a reinforcing band on the outer periphery of the welded portion can be used. Further, in reality, it is often impossible to separate the reinforcing band at the welded portion just by heating the reinforcing band. In such a case, it is necessary to use another means.
That is, the method lacks versatility and reliability of separation.

The present invention solves the above conventional problems,
An object of the present invention is to provide a method of separating a cathode ray tube which can be separated safely and securely at low cost by a simple method. Further, the present invention prevents separation glass at the frit glass portion, thereby preventing the other glass from adhering to the panel side and the funnel side after the division, respectively, and makes it possible to easily produce a recycled material satisfying a required component standard. It is an object of the present invention to provide a method of separating a cathode ray tube which can be provided in the above.

Still another object of the present invention is to provide an apparatus for removing frit glass from a cathode ray tube, which can be suitably used in carrying out the above-described method for separating a cathode ray tube.

[0020]

In order to achieve the above object, the present invention has the following arrangement.

That is, the method of separating a funnel and a panel according to the present invention is a method of separating a cathode ray tube having a funnel and a panel fused by frit glass into the funnel and the panel. A step of removing a part or the whole of the frit glass by applying a mechanical external force; and a step of applying a hot liquid and a cold liquid to the cathode ray tube.

According to the above configuration, the step of removing the frit glass exposed to the outside is provided, so that the funnel can be easily and reliably separated from the panel.
Further, since the removal is performed by applying a mechanical external force, the removal can be performed safely at low cost. Further, since the hot liquid and the cold liquid are applied to the cathode ray tube, the funnel and the panel can be separated at the joint surface. Therefore, the funnel glass and the panel glass can be reused without waste. Further, the component composition ratio of each regenerated material is stabilized, and the recovery operation can be performed efficiently.

Further, the apparatus for removing frit glass from a cathode ray tube according to the present invention can rotate a cathode ray tube in which a funnel and a panel are fused by frit glass, about a normal line at the center of the panel surface as a center of rotation. A rotating table that supports the frit glass, a grinding device that forms a plane by removing a part or all of the frit glass exposed to the outside, and a groove forming apparatus that forms a groove in the formed plane. Features.

According to the above configuration, an optimally shaped groove can be efficiently formed in the frit glass portion exposed to the outside of the cathode ray tube. The cathode ray tube with the groove formed by this device can easily separate the funnel and panel at the joint by applying a heat load thereafter.
As a result, the separation operation can be reliably and efficiently performed.

[0025]

Embodiments of the present invention will be specifically described below with reference to the drawings.

The method for separating a cathode ray tube according to the present invention comprises a step of removing frit glass exposed to the outside (frit glass removal step) and a step of applying a hot liquid and a cold liquid to the cathode ray tube (heat load applying step). ). In the following description, these steps will be sequentially described.

[Frit Glass Removal Step] The separation method of the present invention has, as a pretreatment for separation, a step of removing part or all of frit glass exposed to the outside.
By removing the frit glass, the funnel and the panel can be easily and reliably separated from each other in the subsequent heat load application step.

It is necessary to remove the frit glass by applying a mechanical external force. The conventional method of removing using a solvent requires a special device for safely managing the dangerous solvent. Further, it is necessary to perform a waste liquid treatment so that drainage and sludge generated by the removal do not adversely affect the environment. As a result, the equipment cost increases.

The following first and second embodiments can be exemplified as embodiments of the frit glass removing step of the present invention.

(Embodiment 1) FIG. 1 is a schematic front view showing a schematic configuration of an example of an apparatus for performing a frit glass removing step according to Embodiment 1 of the present invention.

The frit glass removing device 20 shown in FIG.
Reference numeral 0 denotes a rotating table 210 that rotatably supports the cathode ray tube 100, a grinding device 220 that removes the frit glass 130 that has protruded to the outside, and a groove forming device 230 that forms a groove in the frit glass 130.

The rotary table 210 is located at the center of the panel surface of the cathode ray tube 200 (the intersection of diagonal lines of the substantially rectangular panel surface).
Normal (this coincides with the central axis of the cathode ray tube 200)
Holding the cathode ray tube 100 with the direction coinciding with the vertical direction,
The cathode ray tube 100 is rotated in the rotation direction 211 by a rotation mechanism (not shown) using the normal as a rotation axis.

The grinding device 220 supports a motor such as a grinding wheel 221 that can form a flat surface by grinding the frit glass 130 raised outside the cathode ray tube 100, a motor 222 that rotates the grinding wheel 221, and a motor. Arm 22
And 3. The arm 223 is movable in the direction of the arrow 224, whereby the grinding wheel 221 can be moved along the frit glass 130 with the rotation of the cathode ray tube 100, and the cutting amount of the grinding wheel 221 can be adjusted. can do.

The groove forming device 230 is provided with the frit glass 13
The cutting tool includes a cutting tool 231 capable of forming a groove in the cutting tool 0 and an arm 233 holding the cutting tool 231. The arm 233 is movable in the direction of the arrow 234, whereby the cutting tool 231 can be moved along the frit glass 130 with the rotation of the cathode ray tube 100, and the cutting amount of the cutting tool 231 can be adjusted. Can be.

Such a frit glass removing apparatus 200
The method of removing frit glass of the present embodiment using the method will be described with reference to FIG.

FIG. 2 is an enlarged cross-sectional view of a glass frit portion showing a method of removing frit glass according to the present embodiment in the order of steps.

First, as shown in FIG. 2 (A), the rotating grinding wheel 221 is brought close to a portion of the frit glass 130 which protrudes outside the cathode ray tube and is exposed. Then, while rotating the cathode ray tube, the frit glass 1 over the entire circumference.
Grind the tops of the 30 ridges to form a flat surface. The reason why the flat surface is formed is to prevent the cutting edge of the cutting tool from escaping in the next groove forming step. The height H (see FIG. 2B) of the formed flat surface 131 is preferably about 1.5 to 2.5 mm. If the height H is too high, the depth of the groove to be formed in the next groove forming step must be increased, and the workability of the groove forming step deteriorates. On the other hand, if the height H is too low, the effect is not improved, and the grinding process is lengthened.

Next, as shown in FIG. 2B, the cutting tool 231 is brought closer to the formed flat surface 131. Then, a groove is formed in the flat surface 131 of the frit glass 130 over the entire circumference while rotating the cathode ray tube. At this time, it is preferable to install the cutting tool 231 at a height (a position in the vertical direction on the paper of FIG. 2) at which the tip of the cutting tool 231 is inserted into the joint surface between the funnel 110 and the panel 120. By forming the groove at such a position, separation of the funnel 110 and the panel 120 in a heat load applying step described later becomes easy. The depth of the groove is preferably such that the deepest portion reaches a surface including both outer peripheral surfaces of the funnel 110 and the panel 120, specifically, preferably 1 to 3 mm, more preferably 1.5 to 2. It is about 5 mm. If the groove is too shallow, it becomes difficult to separate the funnel 110 and the panel 120 in a heat load applying step described later. On the other hand, if the groove is too deep, the effect is not improved, but the groove forming step is prolonged, wear of the cutting tool 231 and chipping of the cutting edge are generated.

Thus, as shown in FIG. 2C, a groove 132 is formed on the entire outer surface of the frit glass 130, and the frit glass removing step of the present embodiment is completed.

In the above description, the grinding wheel 221 is used for processing the flat surface 131. However, the present invention is not limited to this, as long as it is a means capable of processing a flat surface for preventing escape of a cutting tool during groove processing. However, grinding using a grinding wheel is preferable because of excellent workability of flat processing of frit glass. The grinding wheel to be used is not particularly limited, and may be selected in actual processing.
It is preferable from the viewpoint of workability and the like that a cylindrical (disk-shaped) grinding wheel having a thickness of about 0 mm and a thickness of about 20 mm is used and the outer peripheral surface thereof is subjected to plane processing.

In the above description, the cutting tool 231 is used for processing the groove 132. However, the present invention is not limited to this, as long as it can form the groove 132 having a predetermined depth. However,
Grooving with a cutting tool can process sharp grooves, facilitating separation work. In addition, the workability of groove processing of frit glass is excellent. When a cutting tool is used, in particular, when a carbide cutting tool is used, the cutting depth and the cutting speed can be increased, and the chipping life and the wear of the cutting edge are reduced, so that the workability is improved. The feed speed of the cutting tool may be selected depending on the type of cutting tool to be selected, the cutting depth, and the like, but it is usually preferably 2 to 10 cm / sec. If the feed speed is too slow, the workability deteriorates.
On the other hand, if the feed speed is too high, the cutting edge of the cutting tool is worn or chipped, the frit glass is chipped, cracked, or the like, and a good groove cannot be formed. The angle of the cutting edge of the cutting tool is sharper, so that the separating operation becomes easier. However, if the cutting angle is too sharp, the cutting edge of the cutting tool will be worn or chipped.

In the above-mentioned plane processing and groove processing, workability is improved by setting processing conditions such as the respective cutting depths so that predetermined plane processing and groove processing are completed simultaneously by making one turn of the cathode ray tube. It is preferred.

In the apparatus shown in FIG. 1, an automatic transfer device for automatically transferring the cathode ray tube 100 to the turntable 210 automatically and sequentially may be provided. Thereby, the work efficiency of frit glass removal improves.

Further, in the apparatus shown in FIG.
A height measuring device for measuring the height of the frit glass 130 of the cathode ray tube 100 installed on the rotary table 210, and a frit glass 130 according to the obtained height data.
The rotating table 210 and a height adjusting device that changes the height of one or both of the grinding wheel 221 and the cutting tool 231 may be provided so that the heights of the grinding wheel 221 and the cutting tool 231 match. Thereby, the frit glass 130
Can be flexibly adapted to cathode ray tubes having different heights. The frit glass height measuring device can be constituted by, for example, a pattern recognition device that recognizes a frit glass portion by pattern recognition.

Further, in the apparatus shown in FIG. 1, an apparatus for measuring the outer peripheral surface shape of the cathode ray tube while further rotating the rotary table may be provided. According to this configuration,
The outer peripheral shape of the frit glass portion is measured while rotating the cathode ray tube 100, and the moving amount of the grinding wheel 224 in the cutting direction 224 and the cutting tool 23 are determined based on the obtained shape data.
The amount of movement in the one cutting direction 234 can be controlled. As a result, it is possible to flexibly cope with cathode ray tubes having different sizes and shapes.

Further, by simultaneously providing the automatic transfer device, the frit glass height measuring device, the height adjusting device, and the copying device, the work of the above-described frit glass removing step of the present embodiment can be performed. Efficiency is greatly improved, and the work of removing frit glass from a cathode ray tube having a mixed size and shape can be automated.

(Embodiment 2) FIG. 3 is an enlarged sectional view of a glass frit portion showing a frit glass removing step according to Embodiment 2 of the present invention in the order of steps.

First, as shown in FIG. 3A, a shot blasting process is performed on a portion of the frit glass 130 which protrudes outside the cathode ray tube and is exposed. That is, the nozzle 24
From 0, the media particles 241 are vigorously jetted toward the frit glass 130, and the collision of the media particles 241 causes the frit glass 130 to cover the entire circumference of the cathode ray tube.
Is removed.

The media particles used are not particularly limited.
Known particles used for shot blasting can be used,
For example, alumina, tungsten carbide (WC),
Ceramic-based particles such as carborundum, metal-based particles such as steel balls, industrial diamond particles, and the like can be used. Among these, ceramic particles, particularly alumina particles, are preferred in terms of cutting ability and cost. The particle size is 3
About 00 to 500 μm is preferable in terms of work efficiency. When using alumina particles, the supply amount is 600 to 650.
g / min, the distance between the nozzle and the cathode ray tube is 30 to 50 mm,
The nozzle scanning speed is preferably 30 to 50 mm / sec in terms of work efficiency and the like. The air pressure used when ejecting the particles is 0.5 to 1.0 kg / cm ² , particularly 0.6 to 0.1 kg / cm ² .
8 kg / cm ² is preferable, and the wind speed is, for example, 1.50 m / cm ^2.
It can be supplied by blower blow for 2 seconds. If the air pressure is too strong, the panel or funnel may be chipped or cracked by impact. On the other hand, if the air pressure is too weak, the working efficiency will decrease.

The degree of frit glass removal may be determined in consideration of workability and ease of separation in a heat load applying step to be described later. Removal is preferred. If a large amount of frit glass remains, it may be difficult to separate the frit glass in a heat load applying step described later.

As described above, as shown in FIG. 3B, the frit glass 130 raised outside the cathode ray tube is removed over the entire circumference, and the frit glass removing step of the present embodiment is completed.

The nozzle 240 shown in FIG. 3 can be installed, for example, instead of the grinding device 220 or the groove forming device 230 of the frit glass removing device 200 of the first embodiment shown in FIG. That is, while the cathode ray tube 100 is rotated by the turntable 210, the frit glass 130 raised to the outside is removed. At this time, it is preferable from the viewpoint of workability that the removal is completed by making one turn of the cathode ray tube. Further, it has been described in the first embodiment that the frit glass removing device 200 may include an automatic transfer device for a cathode ray tube, a height measuring device for a frit glass, a height adjusting device, and a copying device. It is the same as

[Heat Load Applying Step] The separation method of the present invention comprises:
A hot liquid and a cold liquid are applied to the cathode ray tube from which part or all of the frit glass attached to the outside has been removed. This makes it possible to separate the funnel from the panel by utilizing the thermal shock caused by repeated rapid expansion and contraction and the difference in the coefficient of thermal expansion between the panel glass and the funnel glass. At this time, if the frit glass is not removed at all, it is difficult to separate the hot liquid and the cold liquid even if they are applied.

Since the separation is performed in this manner, the funnel and the panel can be separated from each other at the joint surface. Therefore, the funnel glass can be separately recovered as a recycled material for the funnel glass, and the panel glass can be separately recovered as a recycled material for the panel glass, so that all the glasses can be reused without waste. Further, since different glass components are not mixed, the component composition ratio of each of the recycled materials is stabilized, and the recovery operation can be performed efficiently.

It is necessary to heat and cool the cathode ray tube with a liquid. Since the liquid easily adheres to the curved surface of the cathode ray tube and has an appropriate specific heat, a rapid temperature change can be easily given to the cathode ray tube by using the liquid. As a liquid that can be used, water, alcohol, oil, and the like can be used. Among them, water is preferable because it has an appropriate specific heat to glass, is easy to handle, and is low in cost.

The temperature of the liquid used is such that the temperature of the hot liquid is 50 ° C. ±
Preferably, the temperature is 1 ° C and the temperature of the cold liquid is 14 ° C ± 1 ° C. By controlling the temperatures of the two liquids in this manner, the cathode ray tube can be easily separated.

The application of the hot liquid and the cold liquid is preferably performed in the order of the hot liquid, the cold liquid, and the hot liquid, that is, in the order of heating, cooling, and heating. By doing in this order,
The cathode ray tube can be easily separated.

When the liquid is applied, it is preferable to apply the liquid through a sheet so that the liquid does not directly contact the cathode ray tube. When the liquid comes into contact with the cathode ray tube, lead contained in the glass of the cathode ray tube elutes or sludge is mixed in the liquid. As a result, there is a danger of seriously affecting the environment as it is, and it is necessary to perform some sort of waste liquid treatment.

The sheet to be used is not particularly limited as long as it can cover the cathode ray tube so that the liquid does not come into contact with the cathode ray tube. For example, nylon, polyester, polyethylene, polypropylene, vinyl chloride,
A resin film made of silicon or the like is preferable because it has excellent liquid blocking properties, adhesion to a cathode ray tube, heat transfer characteristics, and the like. The thickness of the sheet is preferably about 2 to 20 μm. If it is too thin, the handleability will be poor and it will be easily broken. If it is too thick, heat transfer characteristics and adhesion to a cathode ray tube are inferior.

The following third and fourth embodiments can be exemplified as embodiments of the heat load applying step of the present invention.

(Embodiment 3) FIG. 4 is a schematic sectional view showing a schematic configuration of an example of an apparatus for performing a heat load applying step according to Embodiment 3 of the present invention.

The cathode ray tube 100 from which part or all of the frit glass has been removed by the above-described method is supported such that the panel 120 faces upward, and a sheet 301 made of a resin film or the like (sheet 301 in FIG. Is exaggerated). In this state, the liquid 311 is discharged in a shower form from the discharge pipe 310 provided above the panel surface. The discharged liquid flows along the sheet 301 covering the cathode ray tube 100, and is collected in a waste liquid pan 312 provided below the cathode ray tube 100.

At this time, the sheet 301 is
It is preferable that the sheet 301 is pressed toward the funnel 110 by the sheet holder 313 so as to be in close contact with the shape of the frit glass 130 (particularly, the frit glass 130). Thereby, the liquid 3
Heat transfer between the cathode ray tube 11 and the cathode ray tube 100 can be favorably performed.

The switching between the hot liquid and the cold liquid is performed by the discharge pipe 3.
This is carried out by a switching cock (not shown) provided upstream of 10.

For example, in the case of separating a 25-inch cathode ray tube using water as a liquid, first, warm water at 50 ° C. is discharged at a flow rate of 40 liter / min for 45 seconds, and then discharged at 13 liters / minute.
C cold water at a flow rate of 20 l / min for 10 seconds,
Finally, warm water of 50 ° C. is supplied at a flow rate of 40 liters / minute for 10 minutes.
Release for seconds.

When the size of the cathode ray tube is different, the flow rate of the liquid is appropriately changed. The temperature and the discharge time of the liquid should not be changed in principle even if the size of the cathode ray tube changes. The point of the separation method of the present invention is to cause a rapid change in the temperature of the cathode ray tube. Even if the size of the cathode ray tube changes (this means that the heat capacity changes), the same temperature change occurs. This is because it is most appropriate to change the flow rate of the liquid causing the temperature change.

Although three emission tubes 310 are provided in FIG. 4, the number can be changed each time depending on the size of the cathode ray tube 100 and the like. Further, it is preferable that the discharge of the liquid be in a shower state, since heat transfer between the liquid and the cathode ray tube can be favorably performed.

Further, the cathode ray tube 1 of the sheet 313 is replaced with the sheet holder 313 for pressing the sheet 301 from the outside.
The adhesive may be adhered to the cathode ray tube 100 by attaching an adhesive or the like to the 00 side.

(Embodiment 4) FIG. 5 is a schematic sectional view showing a schematic configuration of an example of an apparatus for performing a heat load applying step according to Embodiment 4 of the present invention.

The cathode ray tube 100 from which part or all of the frit glass has been removed by the above-described method, the sheet 301 (in the figure, the thickness of the sheet 301 is exaggerated from the panel 120 side) with the panel 120 facing downward. Is held movably in the vertical direction 341 and the horizontal direction 342. At this time, the sheet 301 is
(Especially, the frit glass 130 portion) is preferably adhered so that heat transfer between the liquid and the cathode ray tube 100 can be performed well.

Reference numerals 320 and 330 denote liquid tanks which store a hot liquid 321 and a cold liquid 331, respectively. Both the hot liquid 321 and the cold liquid 331 are maintained at a predetermined temperature by a temperature control device (for example, a temperature measurement device, a heating or cooling device, a controller, and the like) not shown.

In the present embodiment, the hot liquid and the cold liquid are applied to the cathode ray tube by alternately immersing the cathode ray tube 100 held as described above in the liquid tanks 320 and 330.

For example, when a 25-inch cathode ray tube is separated using water as a liquid, the cathode ray tube is first immersed in warm water 321 at 50 ° C. for 45 seconds, and then immersed in cold water 331 at 13 ° C.
It is immersed for 0 second and finally immersed again in warm water 321 at 50 ° C. for 10 seconds.

When the size of the cathode ray tube is different, the amount of the liquid stored in the liquid tanks 320 and 330 is appropriately changed. The temperature of the liquid and the immersion time should not be changed in principle even if the size of the cathode ray tube changes. The point of the separation method of the present invention is to cause a rapid change in the temperature of the cathode ray tube. Even if the size of the cathode ray tube changes (this means that the heat capacity changes), the same temperature change occurs. This is because it is most appropriate to change the storage amount of the liquid causing the temperature change.

It is preferable that the liquid tanks 320 and 330 have a stirring device for stirring the liquid. As a stirring device, a rotating stirring blade 322, as shown in FIG.
In addition to 332, a compression pump or the like for forcibly circulating the liquid may be used. By stirring the liquid, the temperature of the liquid near the cathode ray tube is always kept constant,
A rapid temperature change can be caused in the cathode ray tube.

In the cathode ray tube to which the heat load is applied according to the third or fourth embodiment, the panel and the funnel can be easily separated from each other at the joint surface formed by the frit glass 130.

It is preferable that the separated panel and funnel are recycled by removing the frit glass adhering to the separation surface with a grinder or the like, and then pulverizing the glass. This is to prevent a component (for example, a lead component) contained in the frit glass from being contained in the recycled material of the panel and the funnel.

[0078]

According to the method of separating a funnel and a panel of the present invention, a step of removing the frit glass exposed to the outside is provided, so that the funnel and the panel can be separated easily and reliably. Further, since the removal is performed by applying a mechanical external force, the removal can be performed safely at low cost. Further, since the hot liquid and the cold liquid are applied to the cathode ray tube, the funnel and the panel can be separated at the joint surface. Therefore, the funnel glass and the panel glass can be reused without waste. Further, the component composition ratio of each regenerated material is stabilized, and the recovery operation can be performed efficiently.

Further, according to the apparatus for removing frit glass of a cathode ray tube of the present invention, a groove having an optimum shape can be efficiently formed in a frit glass portion exposed to the outside of the cathode ray tube. The cathode ray tube in which the groove is formed by this apparatus can easily separate the funnel and the panel at the joint by applying a heat load thereafter, and as a result, the separation operation can be performed reliably and efficiently. it can.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a schematic configuration of an example of an apparatus for removing frit glass according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a glass frit portion showing a method of removing frit glass according to the first embodiment in the order of steps.

FIG. 3 is an enlarged cross-sectional view of a glass frit portion showing a method for removing frit glass according to a second embodiment in the order of steps.

FIG. 4 is a schematic sectional view showing a schematic configuration of an example of an apparatus for applying a thermal load to a cathode ray tube according to a third embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing a schematic configuration of an example of a device for applying a thermal load to a cathode ray tube according to a fourth embodiment of the present invention.

6A and 6B are diagrams showing a schematic configuration of a general cathode ray tube, wherein FIG. 6A is a side view, and FIG.
It is a partial expanded sectional view of a part.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 cathode ray tube 110 funnel 120 panel 121 panel surface 130 frit glass 131 plane 132 groove 200 frit glass removing device 210 rotary table 211 rotational direction 220 grinding device 221 grinding wheel 222 motor 223 arm 224 moving direction 230 groove forming device 231 byte 233 arm 234 Moving direction 240 Nozzle 241 Media particles 301 Sheet 310 Discharge tube 311 Liquid 312 Waste liquid pan 313 Sheet holder 320 Liquid tank 321 Hot liquid 322 Stirring blade 330 Liquid tank 331 Cold liquid 332 Stirring blade 341 342 Moving direction

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuya Sawada 1006 Kadoma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Term (reference) 5C012 AA02

Claims (24)

[Claims] 1. A method of separating a cathode ray tube having a funnel and a panel fused by frit glass into the funnel and the panel, wherein a part or all of the frit glass exposed to the outside is mechanically separated. A method for separating a funnel and a panel of a cathode ray tube, comprising: a step of removing the panel by applying an external force; and a step of applying a hot liquid and a cold liquid to the cathode ray tube. 2. The step of removing the frit glass, the step of machining at least a part of the frit glass into a plane, and the step of: machining a plane in the plane corresponding to a joint between the funnel and the panel. Forming a groove.
The method for separating a funnel and a panel of a cathode ray tube according to the above item. 3. The method for separating a funnel and a panel of a cathode ray tube according to claim 2, wherein the step of machining into a plane is performed by grinding with a grindstone. 4. The method according to claim 2, wherein the depth of the groove is 1 to 3 mm. 5. The method for separating a funnel and a panel of a cathode ray tube according to claim 2, wherein the groove is formed using a cutting tool. 6. The tool according to claim 5, wherein the tool is a carbide tool.
The method for separating a funnel and a panel of a cathode ray tube according to the above item. 7. The feeding speed of the cutting tool is 2 to 10 cm /
The method for separating a funnel and a panel of a cathode ray tube according to claim 5, wherein the time is seconds. 8. The method for separating a funnel and a panel of a cathode ray tube according to claim 1, wherein the frit glass is removed by shot blast. 9. The method for separating a funnel and a panel of a cathode ray tube according to claim 8, wherein the shot blast is performed using alumina particles. 10. The method for separating a funnel and a panel of a cathode ray tube according to claim 1, wherein the liquid is water. 11. The method for separating a funnel and a panel of a cathode ray tube according to claim 1, wherein the temperature of the hot liquid is 50 ° C. ± 1 ° C. 12. The method according to claim 1, wherein the temperature of the cold liquid is 14 ° C. ± 1 ° C. 13. The method for separating a funnel and a panel of a cathode ray tube according to claim 1, wherein the application of the hot liquid and the cold liquid is performed in the order of a hot liquid, a cold liquid, and a hot liquid. 14. The method for separating a funnel and a panel of a cathode ray tube according to claim 1, wherein the hot liquid and the cold liquid are applied to the cathode ray tube via a sheet. 15. The method for separating a funnel and a panel of a cathode ray tube according to claim 14, wherein the sheet is a resin film. 16. The method according to claim 1, wherein the application of the hot liquid and the cold liquid is performed by disposing the cathode ray tube with a panel surface facing upward and discharging the hot liquid and the cold liquid onto the panel surface. The method for separating a funnel and a panel of a cathode ray tube according to the above item. 17. The method according to claim 17, wherein the application of the hot liquid and the cold liquid is performed by alternately immersing the cathode ray tube in a hot liquid tank storing hot liquid and a cold liquid tank storing cold liquid. 2. The method for separating a funnel and a panel of a cathode ray tube according to 1. 18. The method for separating a funnel and a panel of a cathode ray tube according to claim 17, wherein the hot liquid tank and the cold liquid tank have a stirring device for stirring the liquid. 19. A rotating table for rotatably supporting a cathode ray tube in which a funnel and a panel are fused with frit glass around a normal line at a center of the panel surface, and the frit exposed to the outside. An apparatus for removing frit glass of a cathode ray tube, comprising: a grinding device for forming a plane by removing a part or all of glass; and a groove forming apparatus for forming a groove in the formed plane. 20. The apparatus according to claim 19, wherein the grinding device comprises a cylindrical grindstone. 21. The apparatus according to claim 19, wherein the groove forming device includes a cutting tool. 22. The apparatus for removing frit glass from a cathode ray tube according to claim 19, further comprising an automatic transfer device for automatically transferring the cathode ray tube to the rotary table. 23. A height measuring device for measuring the height of the frit glass of the cathode ray tube installed on the rotary table, and the cathode ray tube, the grinding device, and the groove forming device according to the height. 20. The apparatus for removing frit glass of a cathode ray tube according to claim 19, further comprising: a height adjusting device capable of changing at least one of the heights. 24. The apparatus according to claim 24, further comprising a tracing device for an outer peripheral surface of the cathode ray tube, wherein a feed amount of the grinding device and the groove forming device in a cutting direction is controlled based on shape data obtained by the tracing device. Item 20. An apparatus for removing frit glass from a cathode ray tube according to Item 19.