JPS5929537B2 - Sealing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing method using a frit glass mixture for manufacturing color cathode ray tubes, fluorescent display tubes, and the like.

For example, when manufacturing cathode ray tubes, a funnel and a panel are sealed together using a fritted glass mixer (hereinafter referred to as mixer).

That is, as shown in FIG. 1, a mixture 3 is applied onto a sealed end surface 2 of a funnel 1 serving as one member to be sealed.

This mixer 3 forms a vehicle in which, for example, 1 part of nitrocellulose or ethylcellulose is dissolved in 99 parts of an organic solvent such as amyl isoacetate or butyl isoacetate or butyl carpitol acetate, and 200 meshes are passed through this vehicle. 10 parts of frit glass powder was added thereto, and the mixture was thoroughly kneaded to become active.

After applying the mixture 3, it is heated and dried at 130° C. for 5 to 10 minutes, and then applied to the sealed end surface 2 of the funnel 1 on the sealed end surface of the panel 4, which is the other member to be sealed. 5 is accurately aligned using a positioning jig or the like, and joined through the mixer 3, for example, 40
Heat at a high temperature of 0°C for 1 hour.

In this heating process, the two liters of mixed tea 3 are decomposed and evaporated, and the frit glass is further melted and crystallized at 400 to 450°C, or
While remaining amorphous, it is slowly cooled to complete sealing and form the envelope of the cathode ray tube.

Conventionally, in such a manufacturing process, when applying a relatively thick layer of mixed tea (e.g., 0.5 to 1.5 mm), the specific gravity of the mixed tea is large, e.g., d: 4 to 6, so funnel 1 A discharge drop method is used in which the sealed end surface 2 of the applicator is turned upward and the mixture discharged from the applicator is dropped.

However, according to such a method, as shown in FIG. 2, a dent is likely to occur in the center of the mixer 3 after drying.

If there is such a recess, when the panel 4 is superimposed on the funnel 1, a space will be created in the recess.

Therefore, if the frit glass is melted and sealed in this state, much of the air in the space will escape, but there will be a portion where it cannot escape, forming a cavity within the slit glass layer.

In addition, if the tube is sealed while air is escaping, vent holes are formed inside or outside the tube, and further between the inside and outside of the tube.

Not only tubes with ventilation holes inside and outside, but also tubes with ventilation holes on one side, and tubes with cavities that significantly reduce the effective length of the fritted glass layer, even if there are no ventilation holes. Complete vacuum sealing cannot be maintained because near leaks occur in some parts.

In addition, due to the decrease in withstand voltage, a through hole is created in the core due to arc heat, which may also destroy the vacuum seal.
It can destroy the cathode ray tube.

As a method for improving such defects, it is conceivable to turn the sealing end surface 2 of the funnel 1 downward and supply and apply the mixture from below.

According to such a method, the mixture is on the bottom side,
Furthermore, as mentioned above, the specific gravity of Mixture is large and heavy, for example, d: 4 to 6, so the degree of curvature of the surface becomes large, and even after drying, the protrusions remain and the above-mentioned dents do not occur. However, good results can be obtained.

However, even with this method, there are restrictions on the physical characteristics of the mixture used.

For example, if the viscosity of the mixed tea is too low, mountain-shaped protrusions are formed on the surface of the mixed tea 3 as shown in FIG.

In such a state, during sealing, the accuracy of regulating the position with the panel may be hindered, or a portion with a large amount of mixture may protrude in a large amount, and a portion with a small amount of mixture may not be filled, causing vacuum breakdown.

Therefore, the present inventors first turned the sealed end surface 2 of the funnel 1 downward, supplied and applied the mixture from below, and then reversed the funnel 1 so that the sealed end surface 2 faced upward. proposed.

According to this method, the mixture can be coated uniformly over the entire surface without creating any dents or protrusions on the surface.

However, on the other hand, immediately after applying the mixture with the sealed end surface 2 of the funnel 1 facing downward, sagging occurs.

Then, in this state, if funnel 1 is reversed,
Mixture drips onto the inner and outer surfaces of funnel 1.

When the mixture drips into the inner surface of the funnel 1 in this way, it becomes dust inside the tube and adheres to the mask or phosphor, reducing image accuracy, or it adheres to the electron gun, impairing its function.

Furthermore, if it adheres in large clumps, the adhesion causes local strain, which can destroy the cathode ray tube.

Furthermore, if the mixture adheres to the outer surface of the funnel 1, it may similarly easily destroy the cathode ray tube or impede the close contact of the explosion-proof band and the function of the outer dug.

The present invention has been made in view of these points.
To uniformly apply mixed tea to the entire surface without creating dents or protrusions on the surface, and to eliminate sagging of mixed tea to improve safety.

Next, an embodiment of the present invention will be explained in the case of manufacturing a cathode ray tube with reference to FIGS. 4 and 5.

11 is a coating device, and this coating device 11 has a container 12 that is long in the horizontal direction.

This container 12 consists of a bottom plate 13, long side plates 14 on the front and back sides, and short end plates 15 on both end faces, and further has an upper lid plate 16 attached to the front and rear parts of the upper surface, and an opening 17 between the front and rear upper lid plates 16. is formed.

A coating mechanism 21 is provided within the container 12.

In this application mechanism 21, a rotating shaft 22 is rotatably supported between end plates 15 at both ends of a container 120. A lip roller 23 made of stainless steel, rubber, etc. is fixed to this rotating shaft 22. is an opening 17 on the top surface of the container 12.
It is slightly protruding from the surface.

A driving gear 2 is attached to a protrusion at one end of the rotating shaft 22.
A drive device (not shown) is connected to this gear 24, and the roller 23 is rotated together with the rotating shaft 22.

Further, a roller 2 is provided inside the side plate 14 on the front side of the container 12.
A thickness regulating piece 25 is attached to the circumferential surface of the container 12 via a support mechanism 26 so as to be freely adjustable forward and backward.
A residue scraping piece 27 is attached to the inner side of the rear side plate 14 with respect to the circumferential surface of the roller 23 via a support mechanism 28 so as to be adjustable in forward and backward movement.

A transfer device 31 is disposed above the coating device 11.

In this transfer device 31, suspension devices 33 are movably provided on a rail 32 at predetermined intervals.

Further, a support stand 34 is provided below the rail 32 up to the coating device 11 section.

Then, the mixture 3 is placed in the container 12 of the coating device 11.
is injected and stored so that the lower part of the roller 23 is submerged and in contact with it.

When the roller 23 is rotated in the direction of the arrow, the mixture 3 adheres to the roller 23 and is drawn up, rising.

This is scraped off at the tip of the thickness regulating piece 25 so that the mixed tea film 3a has a desired thickness, thereby regulating the amount of the mixed tea film 3a that adheres to the roller 23 and moves up.

On the other hand, one of the funnels 1 as a member to be sealed is held by the neck part of each suspension device 33 of the transfer device 31 and suspended with the sealed end surface 2 facing downward. It moves along the rail 32 in the direction of the arrow along the support stand 34.

Then, when the funnel 1 is placed on the roller 23 coated with the mixed tea film 3a, its sealed end face 2 comes into contact with the mixed tea film 3a, and this mixed tea film 3a adheres to the sealed end face 2.

In this case, it is preferable to set the sealing end surface 2 of the funnel 1 at a position slightly above the upper outer peripheral surface of the roller 23 so that it bites into the mixture film 3a by about 0.05 to 0.5 mm.

Next, as the roller 230 rotates, the excess mixed tea 3 adhering to the roller 23 is removed by the residue scraping piece 27, joins with the mixed tea 3 in the container 12, and is moved up again by the roller 23.

In this way, after applying the mixed cha 3 with the sealed end surface 2 of the funnel 1 facing downward, the dripping 3b of the applied mixed cha 3 was cut off with a knife-shaped cutter 41 and dropped, and then the applied mixture was The funnel 1 is turned over so that the sealed end surface 2 faces upward within the time that the mixed tea 3 does not dry.

As a result, the protruding portion of the mixed tea 3 that appears downward is lowered by its own weight and surface tension, sinks into the nearby mixed tea layer, and becomes flush.

The surface of the frit glass after drying has little curvature and becomes nearly flat as shown in FIG.

After applying the mixed cha 3 and drying it in the same manner as before, the sealed end face 5 of the panel 4, which is the other member to be sealed, is placed on the sealed end face 2 of the funnel 1 using the mixed cha 3. The tubes are bonded together through a tube, heated and sealed, and then subjected to a cooling process to form the envelope of a cathode ray tube.

In the above method, the faster the cutting speed of the cut object, the better.

In other words, if the moving speed of the cutting object is fast, it is difficult to create sag, and the time difference between the first cut and the last cut is small, and the uniformity of the cut surface can be maintained.
For example, about 0.2 seconds is appropriate.

Also, ideally, the position at which to cut the drippings of the mixed tea should be aligned with the surface position of the part where the mixed tea does not sag, but in reality, there are variations in the relative position of the funnel and the cutting body, so it is not ideal. If you adjust the position, there is a risk of cutting the mixture layer where it is not the sauce due to variations.

Therefore, it is better to calculate the dispersion and cut downward by that amount, that is, inside the body.

In this way, even if the inside of someone is cut to a certain extent below, for example, if the distance from the surface of the mixture is one tenth of the width of the application part of the cuff funnel (for example, 5 rum), the sauce will be created at the center of the same width. Even if it is turned over, it will not drip down to the sides, but will remain in the nearby mixture layer, and the drip will be absorbed into the nearby mixture layer by gravity and surface tension, making it almost flat.

However, if the amount of coating is large, it is difficult to completely eliminate the growth of drool, so it is preferable to calculate the amount and set the coating to a location between, for example, the surface of the mixture and half the width of the coating portion.

Note that if the cutting speed of the cut object is fast, there will be less adhesion to the cut object itself, but if a quick-drying vehicle is used, mixture will gradually adhere to the cut object, so cut the cut object at regular intervals, for example, every 15 minutes. Remove the mixcha attached to the body.

In addition, it is better to start turning the funnel relatively early after cutting the drippings of the mixed tea, but the time required to start turning the funnel depends on the physical properties such as the viscosity and specific gravity of the mixed tea, the thickness, etc.
Determined by the size of the application area, etc.

When the time from cutting to turning over is extremely fast, such as 0.01 seconds, and when the reversing speed of the funnel is extremely fast, the opposite side may catch the drip falling from the side to be turned first. On the other hand, if the time from cutting the slit to turning it over is long, a new slit may be formed, so for example, about 0.3 seconds is appropriate.

Also, it is better for the reversal speed of the funnel to be relatively fast;
Again, it is determined by physical properties such as viscosity and specific gravity of the mixture, thickness, and size of the application area.

If the inversion speed is too fast, the centrifugal force during inversion may cause the mixture to be blown away or shifted to one side. On the other hand, if the inversion speed is too slow, new drips may form. For example, about 1 second is appropriate. be.

In practice, for example, the viscosity of the mixture is 7000 centipoise and the thickness is 0.8 mrtt.

When the application width is 8 mm, if the rotation radius of the mixer part that rotates for reversal is 406rn or less, 0.5~
Approximately 1.5 seconds is appropriate.

Further, in order to avoid applying a large acceleration to the mixer, it is preferable to set the speed at the beginning and end of the rotation to be low, and to set the speed at the middle to high speed.

It is preferable to set the center of rotation at the time of reversal toward the mixture chamber, that is, toward the sealed end of the funnel.

In addition, in implementation, the rotational speed of the roller 23 is determined by setting its peripheral speed, more precisely, the peripheral speed of the mixer at the position corresponding to the sealed end surface 2 of the funnel 1, to be the same as the feeding speed of the funnel 1. , the thickness of the mixture applied to the sealed end surface 2 of the funnel 1 can be made most uniform.

Further, even if the thickness regulating piece 25 in the coating mechanism 21 is not used, it is possible to pump up a certain amount of mixed tea by regulating the viscosity of the mixed tea, the outer diameter of the roller 23, the rotation speed, etc.; Further uniformity can be achieved by using 25.

Furthermore, although it is possible to apply the coating without using the scraping piece 27, if the operation is continued for a long time, a layer of mixed chatter that is difficult to move remains on the surface of the roller 23, and the funnel 1
It is desirable to use this because it reduces the amount of mixture applied to the sealed end surface 2 and causes local variations in thickness.

Furthermore, by providing an angle at the end opposite to the roller 23, that is, the end where the mixer falls, the air bubbles can be pushed out and defoamed there.

Next, an embodiment of the cutting device will be described.

In FIG. 1, a long and narrow knife-shaped cutting body 41 is moved in the same direction as the direction of movement of the funnel 1, and the sauce 3 of the mixed tea 3 is
This is to cut b.

In this case, the cutting body 41 may be moved in a direction opposite to the advancing direction of the funnel 1.

In FIG. 8, an elongated knife-shaped cutting body 41 is moved in a direction perpendicular to the advancing direction of the funnel 1 to cut the dripping 3b of the mixed tea 3.

In this case, in order to prevent the dripping 3b from the funnel 1 to which the mixture 3 is applied next from falling onto the cut body 41, and to provide enough space or time to return the cut body 41 to its original position, The interval at which each funnel 1 moves may be increased (it is not necessary), or the cutting body 41 may be made with double-edged blades to cut the sag 3b of the next funnel 1 on the way back.

In FIG. 9, an elongated knife-shaped cutting body 41 is mounted at one end on a support shaft 42 and rotated about 90 degrees to cut the dripping 3b.

In this case as well, the cutting body 41 may be double-edged to cut the sag 3b when both are rotated.

In FIGS. 10 and 11, a handle 44 is provided protruding from the center of the base end of a frame 430, and a thin wire 45 as a cutting body is stretched from the distal end of the frame 43, and both ends of this wire 450 are shown in FIGS. is fixed with a set screw 46, and this one set screw 46
By rotating the wire 45, the tension of the wire 45 can be adjusted.

Then, the frame 43 is moved in a direction perpendicular to the advancing direction of the funnel 1 to cut the dripping 3b.

In this case, cotton thread or the like may be sufficient as the wire 45, but metal, especially piano wire, is preferable in terms of durability.

The thinner the wire 45 is, the less the sagging 3b will adhere to it, but considering the strength and deflection, the wire 45 should be 0°2 to 0.5 m.
A diameter of m is suitable.

When the sag 3b is cut with the wire 45 in this way, there is very little adhesion of the sag 3b, but in the case of a special quick-drying vehicle, for example, the sag 3b adhering to the wire 45 may be removed about once every 3 hours. Even in this case, the wire 45 can be easily removed by flicking it strongly with a fingernail.

Note that by protruding the handle 44 from the center of the base of the frame 43, the sauce 3b does not adhere to the handle 44, and therefore the sauce 3b attached to the handle 44 does not scatter around. , the wire 45 cut at the bottom plate of the frame 43
By receiving the sauce 3b, it is possible to easily collect the sauce 3b.

In FIG. 12, an endless wire 45 is provided on a frame 43 so as to be freely rotatable by a plurality of pulleys 47, and the wire 45 is rotated endlessly by a motor 48 via the pulleys 47. A thin nozzle 49 is provided for the wire 4.
5 is fed at low speed or intermittently, and the dripping 3b attached to the wire 45 is automatically removed by air jetted from the nozzle 49, so that it can be used continuously.

In addition, if the growth rate of sauce 3b is slow, funnel 1
A wire may be stretched and fixed during the zero passage so that the sag 3b is automatically cut as the funnel 1 moves.

In either wire method, the number of wires is not limited to one, and a plurality of wires may be used.

In FIG. 13, a roller 50 is mounted on the upper end of the side plate 14 of the container 12 of the coating device 11, and a knife-shaped scraping piece 51 is provided on the circumferential surface of the roller 50, so that the mix drips from the funnel 1. The dripping 3b of the tea 3 is received by a roller 50, and the roller 50 is rotated to scrape it off with a scraping piece 51.

In other words, if the dripping 3b from the funnel 1 is left undisturbed, if the vehicle is an air-drying vehicle, the mixture 3 will accumulate on the side plate 14 and reach the application part of the funnel 1, obstructing the application or causing vibrations. Although a large dried mixture 3 may fall into the container 12 and impede the smoothness of coating, the dripping 3b is automatically scraped off by the roller 23 and the scraping piece 51 to ensure the smoothness of coating. Can be done.

FIG. 14 shows the sauce 3b caused by the cut body 41 of the funnel 1.
A collection belt 52 is disposed that runs endlessly from below the cut section to above the side plate 14 of the container 12.
A knife-shaped scraping piece 53 is provided at the end of the container 12.
is provided, and the sauce 3b cut by the cutting body 41 is collected by the collection belt 5.
2, the sauce 3b is scraped off with a scraping piece 53 in the container 12, and the sauce 3b is automatically collected into the container 12.

By doing this, in the case of a vehicle with a relatively slow drying speed, the three piles of sauce can be automatically collected to eliminate waste, and also prevent the sauce 3b from adhering to the side plate 14 of the container 12. .

FIG. 15 shows the belt 52 in the case of FIG. 14 above.
The upper surface of the funnel 1 is set as a cutting body in accordance with the cutting position of the sag 3b of the funnel 1.

That is, the drip 3b of the funnel 1 comes into contact with the belt 52 and is torn off and received, and is collected into the container 12 by the belt 520 rotations.

In this case, it is suitable when the viscosity of the mixture 3 is relatively low, and when the drying speed is relatively slow, but
If it dries quickly, it can also be scraped off to the outside of the container 12.

If you want to immediately reverse the funnel 1, lift the funnel 1 and then reverse it, so that the belt 5
Contact with 2 can be prevented.

In FIG. 16, whereas the belt 52 in FIG. 15 is arranged in the same direction as the advancing direction of the funnel 1, a belt 54 is arranged in the direction perpendicular to the advancing direction of the funnel 1, and this A scraping piece 55 and a collection belt 56 are arranged along the side in the 540-turn direction.

Then, the belt 54 receives what falls directly or by being cut off from the sag 3b of the funnel 1, and as it rotates in a direction perpendicular to the traveling direction of the funnel 1, it sequentially receives it diagonally, and the scraping piece 55 collects it. and placed on the collection belt 56, and further collected into the container 14.

In this case, when coating is performed continuously, the drippings 3b do not pile up and fall at the same location, and can be collected uniformly.

In the above-mentioned embodiments, the application method using a roller was described, but the application method is not limited to this, and an appropriate method such as a stamp application method or a belt application method may be selected.

In each of the above-mentioned embodiments, the case where the funnel and panel of a cathode ray tube are sealed with a mixture has been described. For example, the base glass and cover glass of a flat fluorescent display tube may be sealed with a mixture. It can be widely used in the production of articles such as glass tubes.

According to the present invention, the mixed tea is supplied from below and applied to the sealed end face of one of the members to be sealed, such as a funnel, in a downward state, and after cutting off the drippings of the applied mixed tea, By inverting the sealing member so that the sealed end face, that is, the applied mixed tea faces upward, the protrusions of the mixed tea are absorbed by the weight and surface tension of the mixed tea, and the mixed tea can be applied uniformly. At the same time, it is possible to prevent the mixture from sagging, thereby ensuring reliable sealing with the other member to be sealed, and improving safety.

In addition, when cutting the drippings of the mixture, select a cutting body made of a knife, wire or belt,
The best cutting conditions can be achieved by moving or fixing the cutting body in the traveling direction of one of the members to be sealed, or in a direction perpendicular to the other, depending on the characteristics of the member to be sealed and the mixture. It can be carried out.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the funnel and panel of a cathode ray tube, Figures 2 and 3 are cross-sectional views showing the conventional application state;
FIG. 4 is a cross-sectional view of an apparatus showing an embodiment of the present invention, FIG. 9 to 9 are plan views showing an embodiment of a knife-shaped cutting body, FIG. 10 is a plan view showing an embodiment of a wire-shaped cutting body, FIG. 11 is a cross-sectional view thereof, and FIG. FIGS. 13 and 14 are plan views showing other embodiments of the cutting body; FIGS. 13 and 14 are sectional views showing an embodiment of the sagging removal device; FIG. 15 is a side view showing an embodiment of the belt-shaped cutting body; FIG. The figure is a plan view showing another embodiment of the belt-shaped cutting body. 1...Funnel as one member to be sealed,
2...Sealed end surface, 3...Frit glass mixture, 3b...Sag, 4...
- Panel as the other member to be sealed, 5... Sealed end surface, 41, 45° 52.54... Cut body.

Claims (1)

[Claims] 1. A frit glass mixture was applied from below to the sealed end surface of one of the members to be sealed with the sealed end surface facing downward, and the droop of the applied frit glass mixture was cut off. After that, one of the members to be sealed is turned over so that the sealed end face thereof faces upward, and then the sealed end face of the other member to be sealed is joined to the sealed end face of the one member to be sealed and sealed. A sealing method characterized by: 2. The sealing method according to claim 1, characterized in that the sag of the frit glass mixture is cut off with a knife-like cutting body. 3. The sealing method according to claim 1, characterized in that the sag of the frit glass mixture is cut off with a cutter made of wire. 4. The sealing method according to claim 1, characterized in that the sag of the frit glass mixture is cut off with a cutter made of a belt. 5. Claim 1, characterized in that the sag of the frit glass mixture is cut off by a cutting body that moves in the same direction or in the opposite direction to the advancing direction of one of the members to be sealed.
The sealing method according to item 2, 3, or 4. 6. Claims 1 and 2, characterized in that the sag of the frit glass mixture is cut off by a cutting body that moves in a direction perpendicular to the traveling direction of one of the members to be sealed.
The sealing method according to item 3 or 4. 7. The sealing method according to item 1, item 2, or item 3, characterized in that the sag of the frit glass mixture is cut off by a fixed cutting body as one of the members to be sealed moves.