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CN-117756377-B - Method for controlling warping defect of ultra-thin float electronic glass tempering

CN117756377BCN 117756377 BCN117756377 BCN 117756377BCN-117756377-B

Abstract

The invention discloses a method for controlling the warping defect of ultra-thin float electronic glass tempering, which comprises the steps of adjusting the consumption of protective gas, the flow of hydrogen or the exhaust emission of a tin bath diffusing pipe according to the pressure of protective gas in a high-temperature zone of a tin bath and the ratio of hydrogen in the protective gas when the warping defect is tortoise-shaped warping and the glass tin permeation is more than 2 mu g/cm 2 , reducing the consumption of sulfur dioxide under a glass plate or introducing sulfur dioxide on the glass plate when the warping defect is tortoise-shaped warping and the glass tin permeation is less than or equal to 2 mu g/cm 2 , and adjusting the temperature of an annealing kiln when the warping defect is tortoise-shaped warping, the glass tin permeation is less than or equal to 2 mu g/cm 2 and the thickness difference of sulfur film under the glass plate and the thickness of the glass plate is less than or equal to 0.1mm or when the warping defect is boat-shaped warping. According to the invention, different technological parameters are correspondingly adjusted according to different technological conditions aiming at a tin bath section and an annealing section in the float glass forming process, so that the purpose of controlling glass warping defects is achieved, and the application scene is widened.

Inventors

  • WANG SONG
  • WANG QUANXIN

Assignees

  • 青岛融合新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20231221

Claims (5)

  1. 1. The method for controlling the warping defect of the ultra-thin float electronic glass is characterized by comprising the following steps of: s1, when the warping defect is tortoise-shaped warping and the glass tin penetration amount is more than 2 mug/cm 2 , the following operation is carried out: s11, if the pressure of the shielding gas in the high temperature area of the tin bath (1) is less than or equal to 30Pa, the consumption of the shielding gas is increased; s12, if the pressure of the protective gas in the high temperature area of the tin bath (1) is more than 30Pa and the hydrogen ratio in the protective gas is less than or equal to 4.5%, increasing the flow of the hydrogen; S13, if the protective gas pressure of the high temperature area of the tin bath (1) is more than 30Pa and the hydrogen in the protective gas accounts for more than 4.5%, adjusting the exhaust emission of the diffusing pipe (2) of the tin bath (1) to be 1/3-1/4 of the total protective gas; S2, when the warping defect is tortoise-shaped warping and the tin penetration amount of the glass is less than or equal to 2 mug/cm 2 , performing the following operation: S21, if the thickness difference of the sulfur film below the glass plate and the thickness difference of the sulfur film above the glass plate is more than 0.1mm, reducing the usage amount of sulfur dioxide below the glass plate; S22, if the method of the step S21 is adopted, when other defects of the glass plate are increased, recovering the usage amount of sulfur dioxide under the glass plate, and introducing the sulfur dioxide on the glass plate; S3 when the warp defect is tortoise-shaped warp, the glass tin penetration amount is less than or equal to 2 mug/cm 2 , and the thickness difference of a sulfur film below the glass plate and the thickness of a sulfur film above the glass plate is less than or equal to 0.1mm, or the warp defect is boat-shaped warp, performing the following operation of reducing the temperature of an annealing furnace A region (501), increasing the temperature of the middle part of an annealing furnace B region (502) and increasing the temperature of the rear end of the annealing furnace B region (502) in a combination of one or more modes.
  2. 2. The method for controlling warp defect of ultra-thin float electronic glass tempering according to claim 1, wherein in step S11, the increase amount of the shielding gas= (maximum tin penetration amount of the glass plate edge-2) ×12Pa.
  3. 3. The method for controlling warp defect of ultra-thin float electronic glass tempering according to claim 1, wherein in step S12, the increase amount of hydrogen flow = (maximum tin penetration amount of glass plate edge-2) ×5Nm 3 /h.
  4. 4. The method for controlling the warping defect of the ultra-thin float electronic glass tempering according to claim 1, wherein in the step S13, a flowmeter (6) is provided on the diffusing pipe (2).
  5. 5. The method for controlling warp defect of ultra-thin float electronic glass tempering according to claim 1, wherein in step S3, the temperature of the annealing furnace is adjusted each time at not more than 5 ℃.

Description

Method for controlling warping defect of ultra-thin float electronic glass tempering Technical Field The invention relates to the technical field of glass production, in particular to a method for controlling the warping defect of ultra-thin float electronic glass tempering. Background In the process of forming ultrathin float electronic glass, the produced glass raw sheet often generates warping defects during tempering due to factors such as tin immersion in a tin bath, uneven control of annealing stress and the like. The glass becomes thinner and the strength also becomes lower, so that the glass after float forming is required to be chemically tempered, sodium ions with smaller radius in the surface layer of the glass and potassium ions with larger radius in molten salt are exchanged in an ion exchange mode at a certain temperature, and compressive stress and tensile stress are formed on the surface of the glass and inside the glass due to the volume change after the exchange, thereby achieving the effect of improving the strength of the glass. The ultrathin electronic glass produced by the float process has the advantages that in the tin bath forming process, the lower surface of the glass is contacted with tin liquid, the upper surface of the glass is contacted with air, so that the ion concentration of the upper surface and the lower surface of the glass are different, the ion exchange amount of the upper surface and the lower surface is different during ion tempering, the ultrathin electronic glass is easy to warp and deform, the requirement on flatness is high, and the tempering warp phenomenon can seriously influence the quality of glass products. The Chinese patent No. 114988675A discloses a control device and a control method for the warping defect of the plate glass, which comprises a first infrared thermal image thermometer and a second infrared thermal image thermometer which are arranged in an annealing kiln, wherein the two infrared thermal image thermometers are used for detecting the temperature of the upper surface and the lower surface of the glass plate, the detected data are transmitted to an intelligent control system for comparison and analysis, after abnormal points are determined, the intelligent control system sends out instructions, an upper temperature regulator and a lower temperature regulator are respectively driven by a first driving component and a third driving component to rapidly move to the abnormal temperature points of the glass plate, and nitrogen with proper temperature and pressure is used for carrying out temperature compensation on the upper surface and the lower surface of the glass plate, so that the temperature of the upper surface of the glass plate is consistent, and the temperature requirement of the annealing process of the glass plate is met. The patent achieves the aim of controlling the glass warping defect by controlling the temperature of the upper plate surface and the lower plate surface of the glass to be consistent, but the method is only suitable for the problem of the glass warping defect caused by the annealing temperature, and has larger application limitation. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a method for controlling the warping defect of the ultra-thin float electronic glass, aims at a tin bath section and an annealing section in the float glass forming process, correspondingly adjusts different process parameters according to different process conditions, achieves the purpose of controlling the warping defect of the glass, and widens the application scene. As shown in FIG. 1, the types of glass tempering warp defects are generally classified into two types, tortoise-shaped warp (upper part in FIG. 1) and boat-shaped warp (lower part in FIG. 1), most of which are tortoise-shaped warp (upper surface is the atmosphere surface of the tin bath, and lower surface is the contact tin liquid surface). The technical scheme of the invention is as follows: the method for controlling the warping defect of the ultra-thin float electronic glass comprises the following steps: S1, when the warping defect is tortoise-shaped warping and the glass tin penetration amount is more than 2 mug/cm 2, namely the warping caused by tin penetration of the lower surface of the glass, the more serious the tin penetration is caused by oxidation of the tin liquid. The oxidation degree can be judged by observing the tin ash amount in the triangular area of the outlet of the tin bath, the oxidation degree is higher, the sealing condition of the tin bath and the protection of tin liquid are needed to be considered, and the specific operation is as follows: s11, if the protective gas pressure in a high-temperature area of the tin bath is less than or equal to 30Pa, firstly checking the sealing condition of the tin bath, wherein the good sealing condition is caused by the fact that the tin bath pressure is too small,