A method for preparing coated glass by using a same-side double-hole double-coater

Abstract

The application discloses a kind of same side double-hole double-coating film device preparation coating glass method, comprising the following steps, step one, in tin groove same side two positions open two coating film holes;Two coating film holes corresponding position each installs one coating film device system;Step two, first coating film device is passed through first transport system, enters normal production state;Step three, after second coating film device is swept clean waste gas cavity waste gas pipe, when first coating film device reaches production cycle, stop material and raise coating film device, second coating film device is lowered into normal production state;Step four, after first coating film device is swept, it is withdrawn from tin groove by first transport system, after cleaning and maintenance are completed, repeat operation again.Coating film switching cycle is shortened, coating film rate is improved, and coating film rate can be increased to more than 98%.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for preparing coated glass by using a same-side double-hole double-coater. BACKGROUND

[0002] In order to improve the market competitiveness of products, enterprises in the float glass industry today adopt the method of producing diversified products, such as mixed production of colored glass and transparent glass. The coating of sunlight film on colored glass is highly recognized by the market and the value-added of coated glass is high. Since the coating product ratio of the current coating production preparation method is difficult to break through 90% of the high-quality product rate, enterprises need to find a high-coating rate production preparation method to maximize profits and improve the coating product ratio and coating yield as much as possible.

[0003] The production method of online sunlight film coated glass is that the graphite coating device is inserted into the tin bath, the coating device is preheated for about 1 hour, and after the coating device reaches thermal equilibrium in the tin bath and no longer deforms, the coating glass is formed by chemical vapor deposition of silane mixed gas combined with the glass surface. Most of the reaction products are discharged, a small number of adhesion residues are left on the graphite, waste gas chamber and waste gas pipeline, and accumulation reaches a certain degree, which needs to stop coating. Since the raw materials and reaction products have the risk of combustion and explosion, they need to be fully diluted and diluted before they can be discharged from the coating device.

[0004] In the prior art, a single-hole single-coating device is generally used for production. This production method is to open a coating hole on the side of the tin bath shell, insert the coating device into the tin bath for preheating for 1 hour, then lower the upstream graphite of the coating device, supply silane mixed gas, chemical deposition, form a coating layer, start production, and stop for 8-12 hours of coating period. After blowing and cleaning, the reaction products in the waste gas chamber and waste gas pipeline of the coating device are blown clean and the silicon carbide on the graphite is polished flat and clean, and then the coating device is reinserted for production. The coating product ratio (also known as the coating rate) of the coating period to the daily product production of the kiln can only be maintained at 60%-65% under the condition of meeting the requirements of the coating period. SUMMARY

[0005] The main purpose of the present application is to provide a method for preparing coated glass by using a same-side double-hole double-coating device.

[0006] The technical solution adopted by the present application to solve its technical problems is:

[0007] A method for preparing coated glass by using a same-side double-hole double-coating device, comprising the following steps:

[0008] Step one, open two film coating holes at two positions on the same side of the tin bath, and set a tin bath sealing door at each film coating hole; control the temperature of the glass plate in the two film coating hole areas at 630-660℃ and the temperature difference at 4-6℃; install a nitrogen protection device on the film coating hole; install a film coating system at each corresponding position of the two film coating holes; the film coating system comprises a film coating device, and the film coating device has a heating system;

[0009] Step two, first pass the first film coating device through the first conveying system, open the first tin bath sealing door, pass through the first film coating hole position, enter the tin bath at the designated position, open the nitrogen purge heating system, set the temperature at 195-205℃, supply the film coating device with nitrogen gas through the first feeding system, preheat the film coating device for 0.9-1.1 hours, then lower the upstream graphite of the film coating device to a position 3-5mm away from the glass surface, close the nitrogen purge, and transport the prepared film coating raw material mixture into the film coating device through the feeding system to enter the normal production state;

[0010] Step three, after the second film coating device purges the exhaust gas cavity exhaust gas pipe and the graphite is polished flat and clean, supply the second film coating device with heated nitrogen gas for preheating, during the production of the first film coating device, quickly open the second tin bath sealing door through the second conveying system, open 8-12% of the electric heating of the tin bath 2-4 beads in front of the second tin bath sealing door, and close the reverse flow valve in the tin bath; pass through the second film coating hole position, enter the tin bath at the designated position, lower the height of the film coating device to make the upstream graphite 300-400mm away from the glass surface, after the sealing is completed, reopen the reverse flow valve in the tin bath, during which no other actions are allowed to avoid affecting the film coating production of the first film coating device, after the first film coating device reaches the production cycle and stops the material feeding and raises the film coating device, lower the height of the second film coating device to a position about 3-5mm away from the glass surface, close the nitrogen purge, and transport the prepared film coating raw material mixture into the film coating device through the feeding system to enter the normal production state;

[0011] Step four, after the first film coating device is purged, exit the tin bath through the first conveying system, close the electric heating of the tin bath, and close the first tin bath sealing door; after the first film coating device cools outside the tin bath, complete the cleaning and maintenance through purging and polishing; repeat the operation after the first film coating device completes the cleaning and maintenance.

[0012] Further, in step one, two film coating holes are opened at two positions of 18 beads 9 and 19 beads 7 on the same side of the tin bath.

[0013] Further, in step one, the opening positions of the first film coating hole and the second film coating hole avoid the electric heating area in the tin bath.

[0014] Further, in step three, open 8-12% of the electric heating of the tin bath 16-17 beads.

[0015] Further, in step three, the first coater to production cycle is 8-12 hours.

[0016] Further, in step three, the first coater stops feeding and raises the coater, and the second coater lowers the height to enter the normal production state. The switching operation takes 5-10 minutes.

[0017] Compared with the background art, the technical solution has the following advantages:

[0018] 1. The temperature of the glass plate in the two coating hole areas is controlled at 630-660℃, and the temperature difference is 4-6℃. The problem of color difference caused by the inconsistent deposition rate of the film layer due to the temperature difference of the glass ribbon in the two coating hole areas is solved.

[0019] 2. The problem of tin bath pressure fluctuation caused by the opening of the coating hole of the other coater when one coater is in production is solved.

[0020] 3. The problem of glass ribbon temperature drop caused by the simultaneous production of two coaters in the tin bath is solved.

[0021] The present application solves the above key technical problems, can safely shorten the switching cycle of the coating glass production coater, cancel or reduce the interval time of coating and cleaning, to realize the purpose of improving the coating rate, improving the coating production time, improving the coating yield and improving the production yield. The present application can increase the sales revenue of the enterprise product. The present application designs a same-side double-hole double-coater method for preparing coated glass, shortens the coating switching cycle, improves the coating rate, and can improve the coating rate to more than 98%. For details, see Table 1 of the embodiment. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the drawings and examples.

[0023] Figure 1 The arrow is the tin bath flow direction.

[0024] Figure 2 The arrow is the tin bath flow direction.

[0025] Figure 3 The arrow is the tin bath flow direction.

[0026] Figure 4 The arrow is the tin bath flow direction.

[0027] In the figure, 1 is the tin bath, 2 is the side wall, 3 is the first coating hole, 4 is the second coating hole.

[0028] 5 is the walking track, 6 is the transportation system, 7 is the sealing door of the coater, and 8 is the coater.

[0029] 9- tin bath sealing door 9-1 door plate 9-2 sealing strip frame 9-3 sealing door frame 9-4 handle

[0030] 9-5 support handle 9-6 lifting lug DETAILED DESCRIPTION

[0031] Example 1

[0032] Reference Figures 1 to 4 , same side double hole double coating device structure design: in the tin bath 1 same side 18B9 and 19B7 near two position open two 1200mm*900mm coating hole, respectively, the first coating hole 3 and the second coating hole 4, install cast iron frame, design 2 tin bath sealing door 9, structure as shown in Figure 3 and Figure 4 , divided into the first sealing door and the second sealing door, two sealing door structure is the same. Each tin bath sealing door 9 includes door plate 1, the sealing door frame 9-3 is provided around the side of the door plate 1, and the sealing strip frame 9-2 is provided on the outer edge of the sealing door frame 9-3. The door plate 1 is further provided with 9-4 handle, support handle 9-5 and lifting lug 9-6.

[0033] The opening position of the first coating hole 3 and the second coating hole 4 needs to avoid the electric heating area in the tank, and the temperature of the glass plate in the two coating hole areas is controlled at 630-660 DEG C and the temperature difference is 4-6 DEG C, so as to ensure that the temperature requirement of the coating production process is met, and each of the corresponding positions of the two coating holes is designed with an independent hanging type coating device, a transportation system, a waste gas system and a feeding system, respectively, which are the first coating device system and the second coating device system, and the structure is shown in Figure 2 . The first coating device system or the first coating device system structure is the same, which includes a walking track 5 and a transportation system 6 capable of walking along the walking track 5; the transportation system 6 is connected with the coating device 8, and the coating device sealing door 7 is provided beside the coating device 8.

[0034] Nitrogen protection device is installed on the coating hole to ensure that the opening and closing of the sealing door does not affect the pollution of the tin bath, and the nitrogen blowing has a set of electric heating system, which can be used for preheating the coating device after heating, so as to reduce the heat taken away by the coating device in the tin bath; in this way, the two sets of coating systems can be operated independently and do not interfere with each other; this design can save the time of preheating and blowing out the coating device during the switching period.

[0035] High coating rate of sunlight film glass production preparation method:

[0036] (1) First coating film device through the first transport system, open the first tin tank seal door, through the first coating film hole position into the tin tank in the designated position, open the purge nitrogen heating system set at 200 ℃, through the 1# feeding system to the coating film device to supply the purge nitrogen, the coating film device preheating for about 1 hour, the upstream graphite of the coating film device is lowered to a position of about 3-5 mm from the glass surface height, close the purge nitrogen, through the feeding system to transport the prepared coating film raw material mixture into the coating film device, enter the normal production state.

[0037] (2) After the second coating film device is purged clean, the graphite is polished flat and clean, the heated purge nitrogen is supplied to the second coating film device for preheating. During the production of the first coating film device, the second transport system is used to quickly open the second tin tank seal door, the electric heating of the tin tank 16-17 is turned on at 10%, and the backflow valve in the tank is closed to ensure the temperature and tank pressure during the coating film hole entering the coating film device, which does not affect the production of the first coating film device. Through the second coating film hole position into the tin tank in the designated position, lower the height of the coating film device to make the upstream graphite and the glass surface height at 300-400 mm. After the sealing is completed, the backflow valve in the tin tank is reopened, and other actions are prohibited during this period to avoid affecting the coating production of the first coating film device. After the first coating film device reaches the production cycle (8-12 hours), stop the material and raise the coating film device, then lower the height of the second coating film device to about 3-5 mm from the glass surface height, close the purge nitrogen, and transport the prepared coating film raw material mixture into the coating film device through the feeding system, enter the normal production state. The switching operation takes 5-10 minutes.

[0038] (3) After the first coating film device is purged, it is withdrawn from the tin tank through the first transport system, the electric heating of the tin tank is turned off, and the first tin tank seal door is closed. After the first coating film device cools outside the tin tank, the cleaning and maintenance are completed through purging and polishing. After the first coating film device completes the cleaning and maintenance, repeat the above operation.

[0039] Through the device structure design and production preparation method, the coating film device switching cycle can be controlled within 5-10 minutes, which can greatly improve the coating rate and increase the coating yield.

[0040] Example 2

[0041] In order to improve the online production time of the coated glass, a tin tank same side double hole double coating film device structure is designed, that is, two coating film holes are opened on the same side of the tin tank, and two coating film devices are used for online independent operation, which do not interfere with each other, and the coating film switching cycle (from the end of the coating period to the resumption of the material production) is shortened.

[0042] Double-hole double-coater: the glass temperature of the first and second coating hole areas is measured by a handheld thermocouple, which is 652℃ and 647℃, meeting the process requirements. During the production of the first coating hole of the first coating device for 6-8 hours, the thermocouple temperature of the coating area in the tin tank shows 645℃, and the tank pressure is 27pa. During the production of the second coating hole, the electric heating is turned on by 10% and the reverse valve is closed. The second coating device preheated by nitrogen is inserted into the tin tank 2# coating hole for preheating. The thermocouple temperature of the coating area in the tin tank shows 644℃, and the tank pressure is 25pa, which has no obvious effect on the production of the first coating device. The transmittance fluctuation of the coated glass produced during the period is within 0.5%, and the appearance quality also meets the control standard. When the production cycle of the first coating hole of the first coating device reaches 10 hours, the coating device is lifted to a height of 300mm from the glass surface in the tin tank. The first coating device takes 3 minutes (1 minute for stopping production and 2 minutes for lifting the coating device). Immediately, the second coating hole of the second coating device is preheated to a height of about 4mm from the glass surface, and the mixed gas for supplying silane is started. The coating production takes 5 minutes (4 minutes for lowering the coating device and 1 minute for feeding). The coating production operation of this coating switching takes 8 minutes. For the convenience of calculating the coating rate, the unit is hour. The coating switching cycle of this time is 0.13 hours.

[0043] The coating switching cycle of the single-hole single-coating device is about 6 hours (the coating device is stopped for blowing, the coating device is taken out of the tin tank for about 0.3 hours, the coating device is cooled, blown and polished for about 4.5 hours, and the coating device is preheated to be ready for production for about 1.2 hours);

[0044] The coating switching cycle of the single-hole double-coating device is about 1.8 hours (the coating device is stopped for blowing, the coating device is taken out of the tin tank for about 0.3 hours, and the coating device is preheated to be ready for production for about 1.5 hours);

[0045] Under the condition of 10 hours of continuous production in the coating cycle, the coating rate of the double-hole double-coating device is significantly improved compared with the single-hole single-coating device and the single-hole double-coating device (Table 1). The higher the coating rate, the higher the yield. The effect is shown in Table 1

[0046] Table 1 Comparison of coating rates of different structures

[0047]

[0048] The above is only a preferred embodiment of the present application, and therefore cannot limit the scope of the present application. Equivalent changes and modifications made according to the scope and content of the present patent should still be within the scope of the present application.

Claims

1. A method for preparing coated glass using a dual-hole dual-coating apparatus on the same side, characterized in that: Includes the following steps: Step 1: Two coating holes are opened at two locations on the same side of the tin bath, and each coating hole is equipped with a tin bath sealing door; the temperature of the glass plate in the two coating hole areas is controlled at 630-660℃ with a temperature difference of 4-6℃; a nitrogen protection device is installed on the coating hole; a coating system is installed at each corresponding position of the two coating holes; the coating system includes a coating device, and the coating device has a heating system; Step 2: First, the first coating unit is transported through the first conveying system. The first tin bath sealing door is opened, and the first coating hole is passed through to the predetermined position inside the tin bath. The purging nitrogen heating system is turned on, and the temperature is set at 195-205℃. Purging nitrogen is supplied to the first coating unit through the first feeding system. The first coating unit is preheated for 0.9-1.1 hours. Then, the graphite upstream of the first coating unit is lowered to a position 3-5mm above the glass surface. The purging nitrogen is turned off, and the prepared coating raw material mixture is transported into the first coating unit through the feeding system, and the unit enters the normal production state. Step 3: After the second coating unit has been purged of its exhaust chamber and exhaust pipe, and the graphite has been polished smooth and clean, preheat the second coating unit with heated purging nitrogen. During the production of the first coating unit, quickly open the second tin bath sealing door through the second transport system, turn on the electric heating of the 2-4 bays in front of the tin bath at 8-12%, and close the backflow valve in the bath. Enter the tin bath at the predetermined position through the second coating hole, lower the height of the second coating unit so that the height of the upstream graphite and the glass surface is 300-400mm. After sealing, reopen the backflow valve in the tin bath. During this period, other actions are prohibited to avoid affecting the coating production of the first coating unit. When the first coating unit reaches the production cycle, stop feeding and raise the first coating unit. Then lower the height of the second coating unit to a position 3-5mm above the glass surface, turn off the purging nitrogen, and transport the prepared coating raw material mixture into the second coating unit through the feeding system to enter the normal production state. Step 4: After the first coating machine is purged, it exits the tin bath through the first transport system, and the electric heating of the tin bath is turned off; the sealing door of the first tin bath is closed. After the first coating unit cools outside the tin bath, it is cleaned and maintained by blowing and polishing. The process is repeated after the first coating unit has been cleaned and maintained.

2. The method for preparing coated glass using a dual-hole dual-coating device on the same side according to claim 1, characterized in that: In step one, two plating holes are made at positions 18B9 and 19B7 on the same side of the tin bath.

3. The method for preparing coated glass using a dual-hole dual-coating apparatus on the same side according to claim 1, characterized in that: In step one, the opening positions of the first and second coating holes avoid the electric heating area inside the tank.

4. The method for preparing coated glass using a dual-hole dual-coating device on the same side according to claim 1, characterized in that: In step three, turn on the electric heating of the tin bath at 8-12 degrees Celsius (16-17 bays).

5. The method for preparing coated glass using a dual-hole dual-coating device on the same side according to claim 1, characterized in that: In step three, the first coating machine takes 8 to 12 hours to complete the production cycle.

6. The method for preparing coated glass using a dual-hole dual-coating apparatus on the same side according to claim 1, characterized in that: In step three, after the first coating unit stops feeding and raises its height, the second coating unit lowers its height and enters normal production. The switching operation between the first and second coating units takes 5 to 10 minutes.

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