Method for preparing coated glass by using same-side double-hole double-coating device

Abstract

The invention discloses a method for preparing coated glass by using double-hole double-coating devices on the same side, which comprises the following steps: step 1, forming two coating holes in two positions on the same side of a tin bath; the corresponding positions of the two coating holes are respectively provided with a coating device system; secondly, the first coating device enters a normal production state through a first conveying system; 3, after the second coating device blows a waste gas pipe of a waste gas cavity cleanly and the first coating device reaches the production cycle, material ramming is stopped, the coating device is lifted, and the height of the second coating device is reduced to enter a normal production state; and 4, the first coating device exits from the tin bath through the first conveying system after purging is completed, and operation is repeated after cleaning and maintenance are completed. And the film coating switching period is shortened, the film coating rate is improved, and the film coating rate can be increased to 98% or above.

Description

Technical Field

[0001] The invention relates to a method for preparing coated glass using a same-side double-hole double-coating device. Background Art

[0002] In order to improve the market competitiveness of products, float glass enterprises today adopt the method of producing diversified products, such as mixed production of tinted glass and transparent glass. Among them, the sun-coated film on tinted glass is well recognized by the market and the added value of tinted glass is high. Since the proportion of coated products in the current coating production and preparation methods is difficult to stably break through 90% of the high-quality finished product rate, enterprises need to find a production and preparation method with a high coating rate to maximize the proportion of coated products and the coating output.

[0003] The production method of online sunlight film coated glass is that the graphite coater is inserted into the tin bath, the coater is preheated for about 1 hour, and after the coater reaches thermal equilibrium in the tin bath and no longer deforms, a silane mixture is used to combine with the glass surface by chemical vapor deposition to form coated glass. Most of the reaction products are discharged, and a small amount adheres to and remains on the graphite, the exhaust gas chamber and the exhaust gas pipe. When the accumulation reaches a certain level, the coating needs to be stopped. Since the raw materials and reaction products are dangerous for combustion and explosion, they need to be fully purged and diluted before they can be taken out of the coater.

[0004] In the prior art, a single-hole single coater is generally used for production. This production method is to open a coating hole on the side of the tin bath shell, put the coater into the tin bath for preheating for 1 hour, then lower the height of the graphite upstream of the coater, supply a silane mixture, chemically deposit, form a coating layer, and start production until the coating cycle (production 8-12 hours), and it is necessary to stop, stop the material and purge (for cleaning). After the coater is cooled to room temperature, the reaction products in the exhaust chamber and exhaust pipe of the coater are purged and the silicon carbide on the graphite is polished and cleaned before re-entering the coater for production. Under the condition that the coating cycle can meet the requirements, the ratio of the coating product to the daily production of the kiln (also called the coating rate) can only be maintained at 60% to 65%; Summary of the invention

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

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A method for preparing coated glass using a same-side double-hole double-coater comprises the following steps:

[0008] Step 1: two coating holes are opened at two positions on the same side of the tin bath, and each coating hole is provided with a tin bath sealing door; the temperature of the glass plate in the two coating hole areas is controlled at 630-660°C and the temperature difference is 4-6°C; 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;

[0009] Step 2: First, the first coater is passed through the first transportation system, the sealed door of the first tin bath is opened, and the coater enters the predetermined position in the tin bath through the first coating hole position, and the nitrogen purge heating system is turned on, and the temperature is set at 195-205°C. The coater is supplied with nitrogen purge through the first feeding system, and the coater is preheated for 0.9-1.1 hours. Then, the graphite upstream of the coater is lowered to a position 3-5mm above the glass surface, and the nitrogen purge is turned off. The prepared coating raw material mixed gas is transported into the coater through the feeding system, and the coater enters the normal production state.

[0010] Step three, wait for the second coater to purge the exhaust gas chamber and exhaust gas pipe, and after the graphite is polished and cleaned, supply heated purge nitrogen to preheat the second coater. During the production of the first coater, quickly open the second tin bath sealing door through the second transportation system, turn on the electric heating of the 2-4 beakers in front of the tin bath by 8-12%, and close the backflow valve in the bath; enter the predetermined position in the tin bath through the second coating hole position, lower the coater height so that the upstream graphite and the glass surface are at a height of 300-400mm, and after the sealing is completed, reopen the backflow valve in the tin bath. During this period, other actions are prohibited to avoid affecting the coating production of the first coater. After the first coater reaches the production cycle and stops feeding and raising the coater, the second coater is lowered to a height of about 3-5mm from the glass surface, the purge nitrogen is turned off, and the prepared coating raw material mixed gas is transported into the coater through the feeding system to enter the normal production state;

[0011] Step 4: After the first coating device is purged, it exits the tin bath through the first transport system and turns off the electric heating of the tin bath. Close the sealed door of the first tin bath; after the first coating device cools outside the tin bath, it is cleaned and maintained by purging and polishing; repeat the operation after the first coating device is cleaned and maintained.

[0012] Furthermore, in step 1, two plating holes are opened at positions 18bei9 and 19bei7 on the same side of the tin bath.

[0013] Furthermore, in step one, the opening positions of the first coating hole and the second coating hole avoid the electric heating area in the tank.

[0014] Furthermore, in step three, the electric heating of the tin baths 16-17 is turned on by 8-12%.

[0015] Furthermore, in step three, the production cycle of the first coating device is 8 to 12 hours.

[0016] Furthermore, in step three, after the first coater stops pumping materials and raises the coater, the second coater lowers its height and enters a normal production state. The switching operation takes 5 to 10 minutes.

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

[0018] 1. The temperature of the glass plates in the two coating hole areas is controlled at 630-660°C with a temperature difference of 4-6°C; this solves the problem of color difference caused by inconsistent film deposition rates due to the temperature difference of the glass strips in the two coating hole areas;

[0019] 2. Solved the problem that when one coater is in production, the pressure fluctuation of the tin bath will affect production due to the opening of the coating hole in another coater;

[0020] 3. Solved the problem that the temperature of the glass strip would drop and affect production when two coaters were in the tin bath at the same time.

[0021] The present invention solves the above key technical problems, can safely shorten the switching cycle of the coating device for producing coated glass, cancel or reduce the interval time for stopping the coating material and pulling it out for cleaning, so as to achieve the purpose of increasing the coating rate, increasing the coating production time, increasing the coating output ratio, and increasing the production output, which can increase the company's product sales revenue. The present invention designs a method for preparing coated glass using a same-side double-hole double-coater, shortens the coating switching cycle, and improves the coating rate, which can increase the coating rate to more than 98%. For details, see the coating rate comparison table of different structures in Table 1 in the embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the opening position of the tin bath plating hole, and the arrow is the flow direction of the tin bath.

[0024] Figure 2 Schematic diagram of the coating device structure.

[0025] Figure 3 This is a schematic diagram of the front structure of the sealed door.

[0026] Figure 4 It is a schematic diagram of the side structure of the sealing door.

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

[0028] 5-Travel track 6-Transportation system 7-Coating device sealing door 8-Coating device

[0029] 9-Tin bath sealed door 9-1 Door panel 9-2 Sealing strip frame 9-3 Sealed door frame 9-4 Handle

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

[0031] Example 1

[0032] See also Figures 1 to 4 , the same side double hole double coating equipment structure design: open two 1200mm*900mm coating holes at two positions near 18bei9 and 19bei7 on the same side of the tin bath 1, which are the first coating hole 3 and the second coating hole 4 respectively, install the cast iron frame, design two tin bath sealing doors 9, the structure is as follows Figure 3 and Figure 4 As shown, it is divided into a first sealing door and a second sealing door, and the two sealing doors have the same structure. Each tin bath sealing door 9 includes a door panel 1, a sealing door frame 9-3 is arranged around the side of the door panel 1, and a sealing strip frame 9-2 is arranged on the outer edge of the sealing door frame 9-3. The door panel 1 is also provided with a handle 9-4, a support handle 9-5 and a lifting ear 9-6.

[0033] The opening positions of the first coating hole 3 and the second coating hole 4 need to avoid the electric heating area in the tank. The temperature of the glass plate in the two coating hole areas is controlled at 630-660°C and the temperature difference is 4-6°C to ensure that the temperature requirements of the coating production process are met. An independent hanging coating device, transportation system, exhaust system and feeding system are designed for the corresponding positions of the two coating holes, which are the first coating device system and the second coating device system respectively. The structure is as follows Figure 2 The first coating system or the second coating system has the same structure, and both include a walking track 5 and a transportation system 6 that can travel along the walking track 5; the transportation system 6 is connected to the coating device 8, and a coating device sealing door 7 is provided next to the coating device 8.

[0034] A nitrogen protection device is installed on the coating hole to ensure that opening the sealed door to enter and exit the coating machine will not affect the contamination of the tin bath. The nitrogen purge has an electric heating system. After the nitrogen is heated, it can be used to preheat the coating machine to reduce the heat taken away by the coating machine in the tin bath. With this equipment structure design, the two coating systems can be operated independently without interfering with each other. This design can save the time for preheating the coating machine and stopping the material to purge out of the coating machine during the switching cycle.

[0035] Production method of sunlight film glass with high coating rate:

[0036] (1) First, pass the first coater through the first transportation system, open the sealed door of the first tin bath, pass through the first coating hole to enter the predetermined position in the tin bath, turn on the nitrogen purge heating system and set it to 200°C, supply nitrogen purge to the coater through the 1# feeding system, preheat the coater for about 1 hour, lower the graphite upstream of the coater to a position about 3 to 5 mm above the glass surface, turn off the nitrogen purge, and deliver the prepared coating raw material mixed gas into the coater through the feeding system to enter normal production state.

[0037] (2) After the second coater is purged of the exhaust gas chamber and the exhaust gas pipe, and the graphite is polished and cleaned, the heated purge nitrogen is supplied to preheat the second coater. During the production of the first coater, the second tin bath sealing door is quickly opened through the second transportation system, the electric heating of the tin bath 16-17 bei is turned on by 10%, and the backflow valve in the bath is closed to ensure that the temperature and bath pressure are stable during the opening of the coating hole to enter the coater and do not affect the production of the first coater. The coater enters the predetermined position in the tin bath through the second coating hole position, and the height of the coater is lowered to make the upstream stone The height between the ink and the glass surface is 300-400mm. After the sealing is completed, the backflow valve in the tin bath is reopened. During this period, other actions are prohibited to avoid affecting the coating production of the first coater. When the first coater reaches the production cycle (8-12 hours), stop feeding and raise the coater, and then lower the height of the second coater to a position about 3-5mm above the glass surface. Turn off the nitrogen purge, and deliver the prepared coating raw material mixed gas into the coater through the feeding system, and then enter the normal production state. The switching operation takes 5-10 minutes.

[0038] (3) After the first coating device is purged, it exits the tin bath through the first transport system and turns off the electric heating of the tin bath. Close the sealing door of the first tin bath. After the first coating device cools outside the tin bath, it is cleaned and maintained by purging and polishing. Repeat the above operation after the first coating device is cleaned and maintained.

[0039] Through the equipment structure design and production preparation method, the switching cycle of the coater can be controlled within 5 to 10 minutes, which can greatly improve the coating rate and increase the coating output.

[0040] Example 2

[0041] In order to increase the online production time of coated glass, a double-hole double coater equipment structure is designed on the same side of the tin bath. That is, two coating holes are opened on the same side of the tin bath, and two coaters are used to operate and produce online independently without interfering with each other, shortening the coating switching cycle (from the end of the coating cycle to the resumption of material production).

[0042] Double-hole double coater: The glass temperature in the first and second coater hole areas was measured by a handheld thermocouple to be 652°C and 647°C respectively, which met the process requirements. During the period of 6-8 hours when the first coater was put into production for the first coating hole, the thermocouple temperature in the coating area of ​​the tin tank was 645°C, and the tank pressure was 27pa. During the period when the second coater was put into production, the 16-17bei electric heating was opened by 10% and the backflow valve was closed. The second coater preheated by purging nitrogen was inserted into the tin tank 2# coating hole for preheating. The thermocouple temperature in the coating area of ​​the tin tank was 644°C, and the tank pressure was 25pa. There was no obvious impact on the production of the No. 1 coater. The transmittance of the coated glass produced during this period fluctuated between Within 0.5%, the appearance quality also meets the control standard; when the production cycle of the 1# coating machine of the 1# coating hole reaches 10 hours, stop the material and raise the coating machine to a height of 300mm from the glass surface in the tin bath. The 1# coating machine takes 3 minutes (stop material for 1 minute, raise the coating machine for 2 minutes), immediately lower the upstream graphite of the 2# coating machine preheated for the 2# coating hole to a height of about 4mm from the glass surface, supply the silane mixed gas, and start the coating production, which takes 5 minutes (lower the coating machine for 4 minutes, supply material for 1 minute). The coating production operation of this coating machine switching takes 8 minutes. In order to facilitate the calculation of the coating rate, it is unified in hours. The coating switching cycle this time is 0.13 hours;

[0043] The coating switching cycle of a single-hole single coater is about 6 hours (the coater stops material purging, the coater takes about 0.3 hours out of the tin tank, the coater cools down, purges and polishes for about 4.5 hours, and the coater enters the coater for preheating to material discharging for about 1.2 hours);

[0044] The coating switching cycle of a single-hole dual-coater is about 1.8 hours (the coating machine stops material purging, the coating machine is out of the tin bath for about 0.3 hours, and the coating machine is switched to the tin bath for preheating to material discharging for about 1.5 hours);

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

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

[0047]

[0048] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A method for preparing coated glass using a double-hole double-coater on the same side, characterized in that: The steps include: Step 1: two coating holes are opened at two positions on the same side of the tin bath, and each coating hole is provided with a tin bath sealing door; the temperature of the glass plate in the two coating hole areas is controlled at 630-660°C and the temperature difference is 4-6°C; 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 coater is passed through the first transportation system, the sealed door of the first tin bath is opened, and the coater enters the predetermined position in the tin bath through the first coating hole position, and the nitrogen purge heating system is turned on, and the temperature is set at 195-205°C. The coater is supplied with nitrogen purge through the first feeding system, and the coater is preheated for 0.9-1.1 hours. Then, the graphite upstream of the coater is lowered to a position 3-5mm above the glass surface, and the nitrogen purge is turned off. The prepared coating raw material mixed gas is transported into the coater through the feeding system, and the coater enters the normal production state. Step three, wait for the second coater to purge the exhaust gas chamber and exhaust gas pipe, and after the graphite is polished and cleaned, supply heated purge nitrogen to preheat the second coater. During the production of the first coater, quickly open the second tin bath sealing door through the second transportation system, turn on the electric heating of the 2-4 beakers in front of the tin bath by 8-12%, and close the backflow valve in the bath; enter the predetermined position in the tin bath through the second coating hole position, lower the coater height so that the upstream graphite and the glass surface are at a height of 300-400mm, and after the sealing is completed, reopen the backflow valve in the tin bath. During this period, other actions are prohibited to avoid affecting the coating production of the first coater. After the first coater reaches the production cycle and stops feeding and raising the coater, the second coater is lowered to a height of 3-5mm from the glass surface, the purge nitrogen is turned off, and the prepared coating raw material mixed gas is transported into the coater through the feeding system to enter the normal production state; Step 4: After the first coating device is purged, it exits the tin bath through the first transportation 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 coater cools down outside the tin bath, it is cleaned and maintained by purging and polishing; the operation is repeated after the first coater is cleaned and maintained.

2. The method for preparing coated glass by using a same-side double-hole double-coater according to claim 1, characterized in that: In step 1, two plating holes are opened at positions 18bei9 and 19bei7 on the same side of the tin bath.

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

4. The method for preparing coated glass by using a same-side double-hole double-coater according to claim 1, characterized in that: In step 3, the electric heating of the tin bath 16-17 is turned on by 8-12%.

5. The method for preparing coated glass by using a same-side double-hole double-coater according to claim 1, characterized in that: In step three, the production cycle of the first coating device is 8 to 12 hours.

6. The method for preparing coated glass by using a same-side double-hole double-coater according to claim 1, characterized in that: In step three, after the first coater stops pumping materials and raises the coater, the second coater lowers its height and enters normal production status. The switching operation takes 5 to 10 minutes.

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