CN108249743B - Shaping method suitable for drawing flexible glass - Google Patents
Shaping method suitable for drawing flexible glass Download PDFInfo
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- CN108249743B CN108249743B CN201810263689.5A CN201810263689A CN108249743B CN 108249743 B CN108249743 B CN 108249743B CN 201810263689 A CN201810263689 A CN 201810263689A CN 108249743 B CN108249743 B CN 108249743B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/068—Means for providing the drawing force, e.g. traction or draw rollers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/067—Forming glass sheets combined with thermal conditioning of the sheets
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Abstract
The utility model provides a design method that is fit for flexible glass drawing, belongs to the technical field of flexible glass drawing design, carries out the design through the design stove, and the glass area is thin, the carry over pinch rolls pulls through the drawing edge machine exhibition after the platinum bushing mouth flows out, gets into the design stove, the design stove includes the heating module that the trilaminar symmetry set up, and one side that heating module faces the glass area is provided with polycrystal carborundum soaking board, is provided with cooling device between first layer heating module and second floor heating module, and the aircraft nose setting of drawing edge machine is between the heating module that the first layer symmetry set up, all is provided with the carry over pinch rolls between the heating module that the second floor, third layer symmetry set up. The shaping method has stable shaping effect, the thickness of the drawn flexible glass is as thin as 0.04mm, the thickness difference in the effective size is less than or equal to 10 mu m, and the warping degree is less than or equal to 0.1%.
Description
Technical Field
The invention belongs to the technical field of flexible glass drawing and shaping, relates to a shaping method for flexible glass drawing, and particularly relates to a shaping method for flexible glass drawing by using a shaping furnace. The shaping method has stable shaping effect, the thickness of the drawn flexible glass is as thin as 0.04mm, the thickness difference in the effective size is less than or equal to 10 mu m, and the warping degree is less than or equal to 0.1%.
Background
The flexible glass is ultrathin glass with the thickness of less than or equal to 0.1mm and capable of realizing a roll-to-roll process. Flexible glass can be bent while having the hardness, transparency, heat resistance, electrical insulation, gas impermeability, and mechanical and chemical properties of glass that are stable in oxidizing and light environments. The high temperature resistance of the flexible glass can meet the requirement that part of optoelectronic devices need to be subjected to high temperature treatment, and the outstanding bending property and winding property of the flexible glass enable the continuous roll-to-roll printing process to be adopted to prepare various optoelectronic devices, so that the flexible glass is a preferable base material of the future flexible printing optoelectronic devices and can possibly cause the essential revolution and leap of the flexible display and solar cell industries.
At present, several glass companies in the world have flexible glass samples displayed and form a technical monopoly, but the application of the flexible glass is not known to be published. In recent years, China has developed a lot in the aspect of ultrathin plate glass, but research and development of flexible glass are not carried out yet, independent innovation is needed, and research and development force is rapidly put into and increased.
The flexible glass is thin like paper, and the defects of glass stripes, warping and the like can be caused by non-uniform viscosity of molten glass, non-uniform temperature of a temperature field, low mechanical assembly precision, unreasonable temperature system and mechanical vibration in the drawing process of the flexible glass, so that the flexible glass is an important reason that the flexible glass cannot be industrialized at a later time.
Disclosure of Invention
The invention provides a shaping method suitable for drawing flexible glass, which solves the problems, and has the advantages of stable shaping process, uniform viscosity of glass liquid, uniform temperature of a temperature field, high mechanical assembly precision, reasonable temperature system, no stripe of shaped glass and extremely small warping degree in the drawing process.
The technical scheme adopted by the invention for realizing the purpose is as follows:
the utility model provides a design method that is fit for flexible glass drawing, stereotypes through the design stove, and the glass area is thin, the carry over pinch rolls pulls from the platinum bushing mouth after flowing, through the stretch of drawing the limit machine exhibition, gets into the design stove, the design stove includes the heating module that the three-layer symmetry set up, and one side that heating module faces the glass area is provided with polycrystal carborundum soaking plate, is provided with cooling device between first layer heating module and second floor heating module, and the aircraft nose setting of drawing the limit machine is between the heating module that the first layer symmetry set up, all is provided with the carry over pinch rolls between the heating module that second floor, third layer symmetry set up. Wherein the bottom of the first layer of heating module is lower than the position of the edge-drawing machine head in the horizontal direction.
Each layer contains at least 1 pair of symmetrically disposed heating modules, each set of heating modules including at least 3 pairs of symmetrically disposed heating elements, each heating element individually retractable back and forth relative to the glass ribbon.
Glass edge cooling devices are arranged between the adjacent heating modules on the second layer and between the adjacent heating modules on the third layer.
The polycrystalline silicon carbide soaking plates in the first layer are obliquely arranged, and the included angle between the polycrystalline silicon carbide soaking plates and the horizontal line is 60 degrees.
The polycrystalline silicon carbide soaking plates in the second layer and the third layer are arranged vertical to the horizontal plane.
The cooling device is a T-shaped cooling water pipe, and the T-shaped cooling water pipe can horizontally move far and near relative to the surface of the glass ribbon.
The glass edge cooling device is an L-shaped cooling water pipe which can horizontally move far and near relative to the edge of the glass ribbon.
The linear speed of the edge roller is controlled to be 10-40mm/s, and the linear speed of the traction roller is controlled to be 15-45 mm/s. By controlling the linear speed of the drawing edge-drawing machine and the linear speed of the traction roller, the control on the thickness of the glass can be realized, and the thickness of the glass comprises the thin thickness degree of the glass and the thin thickness uniformity of the glass.
The invention has the beneficial effects that:
the method is provided with the adjustable uniform temperature control system and the cooling system for quickly shaping the glass, can accurately control the proper temperature of the edge roller and the traction roller, can quickly cool the glass belt at the proper position, can effectively prevent the flexible glass from warping and thickness difference, and can draw the flexible glass with the thickness as thin as 0.04 mm.
The invention also has the following advantages:
(1) according to the invention, a heating mode of the polycrystalline silicon carbide plate and the combined heating module is adopted, so that an accurate temperature field with transverse stability and longitudinal gradient distribution can be realized.
(2) The inclined polycrystalline silicon carbide plate which is arranged on the first layer of the heating module and faces the glass belt can enable the glass liquid which just flows out of the platinum bushing plate to reach the proper edge-drawing temperature in a short time, and prevent the glass belt from excessively shrinking due to surface tension.
(3) According to the invention, a plurality of T-shaped cooling water pipe combinations are arranged below the first layer of heating module, and the distance of the combinations can be adjusted according to the temperature of the glass ribbon, so that the thinned glass ribbon can be rapidly cooled and shaped.
(4) According to the invention, the L-shaped cooling device is arranged between the adjacent heating modules in the second layer and the third layer, and mainly used for cooling the thicker glass edge to prevent the edge from deforming to cause the warping of the glass.
(5) The shaping device designed by the invention can be used for drawing the flexible glass with the thickness as thin as 0.04mm, the thickness difference in the effective size less than or equal to 10 mu m and the warping degree less than or equal to 0.1%.
(6) The design of the polycrystalline silicon carbide soaking plate of the shaping furnace, the design of the cooling device and the design of the glass edge cooling device are completely formed in a soaking and stable environment in the process of forming the glass plate, no trace or damage can be generated on the surface of the glass, the surface quality of the prepared glass plate is very high, and subsequent grinding and polishing treatment is not needed; meanwhile, the glass production with different components and temperature requirements can be met.
Drawings
FIG. 1 is a schematic cross-sectional view of a setting device of the present invention.
FIG. 2 is a schematic diagram of the horizontal combination cooling system of the present invention.
FIG. 3 is a schematic view of the vertical cooling system of the present invention.
In the drawing, 1 represents a heating module, 2 represents a polycrystalline silicon carbide soaking plate, 3 represents a glass ribbon, 4 represents a head of an edge roller, 5 represents a cooling device, 6 represents a drawing roll, and 7 represents a glass edge cooling device.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
The sodium-calcium-silicon glass broken particles are selected for melting, and the glass comprises the following specific components: according to the weight percentageMeter, SiO272％，Al2O31.5％，CaO8％，MgO4％，Na2And 14.5 percent of O. The melted glass flows out through a platinum slit, and the width of the slit is 2 mm.
The heating modules in the shaping furnace are divided into 3 layers and 6 groups, each group of heating modules consists of 3 heating modules, the cross sectional area of the first layer of heating modules is 100 multiplied by 200mm, and the cross sectional areas of the second layer of heating modules and the third layer of heating modules are 200 multiplied by 200 mm. The front end of each group of heating modules is provided with a polycrystalline silicon carbide plate, the distance between the bottom edge of the first layer of polycrystalline silicon carbide plate and the glass belt is 12mm, and the distance between the bottom edges of the second layer of polycrystalline silicon carbide plate and the third layer of polycrystalline silicon carbide plate and the glass belt is 20 mm. The position of the heating module away from the glass belt is adjusted forwards and backwards, so that the transverse temperature field is uniform. The temperature of the central glass belt of the first heating module layer is controlled to be 710 ℃, the temperature of the central glass belt of the second heating module layer is controlled to be 500 ℃, and the temperature of the central glass belt of the third heating module layer is controlled to be 400 ℃.
And adjusting the cooling device, wherein the cooling medium is cold water or cold air, the distance between the T-shaped cooling pipe and the glass ribbon is adjusted by 100mm from the left and right, and the distance between the L-shaped cooling pipe of the glass edge cooling device and the glass edge is adjusted by 50mm from the front and back.
And adjusting the rotating speed of the edge roller and the drawing roller, wherein the rotating speed of the edge roller is controlled at 10mm/s, and the rotating speed of the drawing roller is controlled at 15 mm/s.
Measuring the temperature every 150mm in the center direction of the first heating module layer, and detecting the temperature distribution from left to right as 731 ℃, 736 ℃, 740 ℃, 735 ℃ and 730 ℃.
Measuring the temperature every 150mm in the center direction of the heating module at the second layer, and detecting the temperature distribution from left to right as 492 ℃, 496 ℃, 500 ℃, 495 ℃ and 491 ℃.
Measuring the temperature every 150mm in the center direction of the third heating module layer, and detecting the temperature distribution from left to right as 393 ℃, 397 ℃, 400 ℃, 395 ℃ and 391 ℃.
Through detection, the temperature field is uniform in temperature distribution. Through drawing experiments, the thickness of a drawn flexible glass sample is 0.07mm, the thickness difference in the effective thickness is 10 mu m, the warping degree is 0.1%, and the yield is 83%.
Example 2
The sodium-calcium-silicon glass broken particles are selected for melting, and the glass comprises the following specific components: in weight percent, SiO272％，Al2O31.5％，CaO8％，MgO4％，Na2And 14.5 percent of O. The melted glass flows out through a platinum slit, and the width of the slit is 2 mm.
The heating modules in the shaping furnace are divided into 3 layers and 6 groups, each group of heating modules consists of 5 heating modules, the cross sectional area of the first layer of heating modules is 100 multiplied by 120mm, and the cross sectional areas of the second layer of heating modules and the third layer of heating modules are 120 multiplied by 200 mm. The front end of each group of heating modules is provided with a polycrystalline silicon carbide plate, the distance between the bottom edge of the first layer of polycrystalline silicon carbide plate and the glass belt is 12mm, and the distance between the bottom edges of the second layer of polycrystalline silicon carbide plate and the third layer of polycrystalline silicon carbide plate and the glass belt is 20 mm. The position of the heating module away from the glass belt is adjusted forwards and backwards, so that the transverse temperature field is uniform. The temperature of the central glass belt of the first heating module layer is controlled to be 710 ℃, the temperature of the central glass belt of the second heating module layer is controlled to be 500 ℃, and the temperature of the central glass belt of the third heating module layer is controlled to be 400 ℃.
And adjusting the cooling device, wherein the cooling medium is cold water or cold air, the distance between the T-shaped cooling pipe and the glass ribbon is adjusted by 100mm from the left and right, and the distance between the L-shaped cooling pipe of the glass edge cooling device and the glass edge is adjusted by 50mm from the front and back.
And adjusting the rotating speed of the edge roller and the drawing roller, wherein the rotating speed of the edge roller is controlled at 10mm/s, and the rotating speed of the drawing roller is controlled at 15 mm/s.
Measuring the temperature every 150mm in the center direction of the first heating module layer, and detecting the temperature distribution from left to right as 739 ℃, 740 ℃, 740 ℃, 739 ℃ and 739 ℃.
Measuring a temperature every 150mm in the center direction of the heating module at the second layer, and detecting the temperature distribution from left to right as 499 ℃, 500 ℃, 500 ℃, 500 ℃ and 499 ℃.
Measuring the temperature every 150mm in the center direction of the third heating module layer, and detecting the temperature distribution from left to right at 400 ℃, 400 ℃, 400 ℃, 400 ℃ and 399 ℃.
Through detection, the temperature field is uniform in temperature distribution. Through drawing experiments, the thickness of a drawn flexible glass sample is 0.07mm, the thickness difference in the effective thickness is 8.5 mu m, and the yield is 88% when the warpage is 0.08%.
Example 3
The sodium-calcium-silicon glass broken particles are selected for melting, and the glass comprises the following specific components: in weight percent, SiO272％，Al2O31.5％，CaO8％，MgO4％，Na2And 14.5 percent of O. The melted glass flows out through a platinum slit, and the width of the slit is 2 mm.
The heating modules in the shaping furnace are divided into 3 layers and 6 groups, each group of heating modules consists of 5 heating modules, the cross sectional area of the first layer of heating modules is 100 multiplied by 120mm, and the cross sectional areas of the second layer of heating modules and the third layer of heating modules are 120 multiplied by 200 mm. The front end of each group of heating modules is provided with a polycrystalline silicon carbide plate, the distance between the bottom edge of the first layer of polycrystalline silicon carbide plate and the glass belt is 12mm, and the distance between the bottom edges of the second layer of polycrystalline silicon carbide plate and the third layer of polycrystalline silicon carbide plate and the glass belt is 20 mm. The position of the heating module away from the glass belt is adjusted forwards and backwards, so that the transverse temperature field is uniform. The temperature of the central glass belt of the first heating module layer is controlled to be 710 ℃, the temperature of the central glass belt of the second heating module layer is controlled to be 500 ℃, and the temperature of the central glass belt of the third heating module layer is controlled to be 400 ℃.
And adjusting the cooling device, wherein the cooling medium is cold water or cold air, the distance between the T-shaped cooling pipe and the glass ribbon is adjusted by 60mm from the left and right, and the distance between the L-shaped cooling pipe of the glass edge cooling device and the glass edge is adjusted by 30mm from the front and back.
And adjusting the rotating speed of the edge roller and the drawing roller, wherein the rotating speed of the edge roller is controlled at 10mm/s, and the rotating speed of the drawing roller is controlled at 15 mm/s.
Measuring the temperature every 150mm in the center direction of the first heating module layer, and detecting the temperature distribution from left to right as 739 ℃, 740 ℃, 740 ℃, 739 ℃ and 739 ℃.
Measuring a temperature every 150mm in the center direction of the heating module at the second layer, and detecting the temperature distribution from left to right as 499 ℃, 500 ℃, 500 ℃, 500 ℃ and 499 ℃.
Measuring the temperature every 150mm in the center direction of the third heating module layer, and detecting the temperature distribution from left to right at 400 ℃, 400 ℃, 400 ℃, 400 ℃ and 399 ℃.
Through detection, the temperature field is uniform in temperature distribution. Through drawing experiments, the thickness of a drawn flexible glass sample is 0.06mm, the thickness difference in the effective thickness is 7.5 mu m, the warping degree is 0.06%, and the yield is 91%.
Example 4
The sodium-calcium-silicon glass broken particles are selected for melting, and the glass comprises the following specific components: in weight percent, SiO272％，Al2O31.5％，CaO8％，MgO4％，Na2And 14.5 percent of O. The melted glass flows out through a platinum slit, and the width of the slit is 2 mm.
The heating modules in the shaping furnace are divided into 3 layers and 6 groups, each group of heating modules consists of 5 heating modules, the cross sectional area of the first layer of heating modules is 100 multiplied by 120mm, and the cross sectional areas of the second layer of heating modules and the third layer of heating modules are 120 multiplied by 200 mm. The front end of each group of heating modules is provided with a polycrystalline silicon carbide plate, the distance between the bottom edge of the first layer of polycrystalline silicon carbide plate and the glass belt is 12mm, and the distance between the bottom edges of the second layer of polycrystalline silicon carbide plate and the third layer of polycrystalline silicon carbide plate and the glass belt is 20 mm. The position of the heating module away from the glass belt is adjusted forwards and backwards, so that the transverse temperature field is uniform. The temperature of the central glass belt of the first heating module layer is controlled to be 710 ℃, the temperature of the central glass belt of the second heating module layer is controlled to be 500 ℃, and the temperature of the central glass belt of the third heating module layer is controlled to be 400 ℃.
And adjusting the cooling device, wherein the cooling medium is cold water or cold air, the distance between the T-shaped cooling pipe and the glass ribbon is adjusted by 60mm from the left and right, and the distance between the L-shaped cooling pipe of the glass edge cooling device and the glass edge is adjusted by 30mm from the front and back.
And adjusting the rotating speed of the edge roller and the drawing roller, wherein the rotating speed of the edge roller is controlled at 25mm/s, and the rotating speed of the drawing roller is controlled at 30 mm/s.
Measuring the temperature every 150mm in the center direction of the first heating module layer, and detecting the temperature distribution from left to right as 739 ℃, 740 ℃, 740 ℃, 739 ℃ and 739 ℃.
Measuring a temperature every 150mm in the center direction of the heating module at the second layer, and detecting the temperature distribution from left to right as 499 ℃, 500 ℃, 500 ℃, 500 ℃ and 499 ℃.
Measuring the temperature every 150mm in the center direction of the third heating module layer, and detecting the temperature distribution from left to right at 400 ℃, 400 ℃, 400 ℃, 400 ℃ and 399 ℃.
Through detection, the temperature field is uniform in temperature distribution. Through drawing experiments, the thickness of a drawn flexible glass sample is 0.06mm, the thickness difference in effective thickness is 7 mu m, the warping degree is 0.06%, and the yield is 89%.
Example 5
The sodium-calcium-silicon glass broken particles are selected for melting, and the glass comprises the following specific components: in weight percent, SiO272％，Al2O31.5％，CaO8％，MgO4％，Na2And 14.5 percent of O. The melted glass flows out through a platinum slit, and the width of the slit is 2 mm.
The heating modules in the shaping furnace are divided into 3 layers and 6 groups, each group of heating modules consists of 5 heating modules, the cross sectional area of the first layer of heating modules is 100 multiplied by 120mm, and the cross sectional areas of the second layer of heating modules and the third layer of heating modules are 120 multiplied by 200 mm. The front end of each group of heating modules is provided with a polycrystalline silicon carbide plate, the distance between the bottom edge of the first layer of polycrystalline silicon carbide plate and the glass belt is 12mm, and the distance between the bottom edges of the second layer of polycrystalline silicon carbide plate and the third layer of polycrystalline silicon carbide plate and the glass belt is 20 mm. The position of the heating module away from the glass belt is adjusted forwards and backwards, so that the transverse temperature field is uniform. The temperature of the central glass belt of the first heating module layer is controlled to be 710 ℃, the temperature of the central glass belt of the second heating module layer is controlled to be 500 ℃, and the temperature of the central glass belt of the third heating module layer is controlled to be 400 ℃.
And adjusting the cooling device, wherein the cooling medium is cold water or cold air, the distance between the T-shaped cooling pipe and the glass ribbon is adjusted by 60mm from the left and right, and the distance between the L-shaped cooling pipe of the glass edge cooling device and the glass edge is adjusted by 30mm from the front and back.
And adjusting the rotating speed of the edge roller and the drawing roller, wherein the rotating speed of the edge roller is controlled at 40mm/s, and the rotating speed of the drawing roller is controlled at 45 mm/s.
Measuring the temperature every 150mm in the center direction of the first heating module layer, and detecting the temperature distribution from left to right as 739 ℃, 740 ℃, 740 ℃, 739 ℃ and 739 ℃.
Measuring a temperature every 150mm in the center direction of the heating module at the second layer, and detecting the temperature distribution from left to right as 499 ℃, 500 ℃, 500 ℃, 500 ℃ and 499 ℃.
Measuring the temperature every 150mm in the center direction of the third heating module layer, and detecting the temperature distribution from left to right at 400 ℃, 400 ℃, 400 ℃, 400 ℃ and 399 ℃.
Through detection, the temperature field is uniform in temperature distribution. Through drawing experiments, the thickness of a drawn flexible glass sample is 0.04mm, the thickness difference in the effective thickness is 7 micrometers, the warping degree is 0.05%, and the yield is 86%.
Example 6
Further preferably, the following adjusted glass components are adopted, and the structure and the control of the shaping furnace are combined, so that the flexible glass with the thickness as thin as 0.02mm can be prepared, the yield is up to more than 95%, and the subsequent polishing treatment is not needed.
The glass comprises the components of SiO in percentage by weight2 50.8-62.5％，Al2O3 0.2-0.7％，CaO 0.2-8.2％，MgO 8-10.6％，Na2O 3-6％，B2O3 10-15.9％,Bi2O3 3-5％，K2O0.1-0.5％，CeO2 4.6-5.1％，P2O50.2 to 1 percent. Before the glass broken particles are melted, nitrogen is firstly used for leaching or flushing for 1-2min, so that the glass is cleaned, the mechanical abrasion among particles is reduced, the surface energy of the particles is reduced, the phenomenon that glass sheets are broken in the preparation process is avoided, and cracks are reduced.
The glass composition of this example comprises, in weight percent, SiO2 60％，Al2O3 0.5％，CaO 5％，MgO 9.5％，Na2O 5％，B2O3 10％,Bi2O3 4％，K2O 0.4％，CeO2 4.6％，P2O51 percent. The melted glass flows out through a platinum slit, and the width of the slit is 2 mm.
The heating modules in the shaping furnace are divided into 3 layers and 6 groups, each group of heating modules consists of 5 heating modules, the cross sectional area of the first layer of heating modules is 100 multiplied by 120mm, and the cross sectional areas of the second layer of heating modules and the third layer of heating modules are 120 multiplied by 200 mm. The front end of each group of heating modules is provided with a polycrystalline silicon carbide plate, the distance between the bottom edge of the first layer of polycrystalline silicon carbide plate and the glass belt is 12mm, and the distance between the bottom edges of the second layer of polycrystalline silicon carbide plate and the third layer of polycrystalline silicon carbide plate and the glass belt is 20 mm. The position of the heating module away from the glass belt is adjusted forwards and backwards, so that the transverse temperature field is uniform. The temperature of the central glass belt of the first heating module layer is controlled to be 710 ℃, the temperature of the central glass belt of the second heating module layer is controlled to be 500 ℃, and the temperature of the central glass belt of the third heating module layer is controlled to be 400 ℃.
And adjusting the cooling device, wherein the cooling medium is cold water or cold air, the distance between the T-shaped cooling pipe and the glass ribbon is adjusted by 60mm from the left and right, and the distance between the L-shaped cooling pipe of the glass edge cooling device and the glass edge is adjusted by 30mm from the front and back.
And adjusting the rotating speed of the edge roller and the drawing roller, wherein the rotating speed of the edge roller is controlled at 40mm/s, and the rotating speed of the drawing roller is controlled at 45 mm/s.
Measuring the temperature every 150mm in the center direction of the first heating module layer, and detecting the temperature distribution from left to right as 739 ℃, 740 ℃, 740 ℃, 739 ℃ and 739 ℃.
Measuring a temperature every 150mm in the center direction of the heating module at the second layer, and detecting the temperature distribution from left to right as 499 ℃, 500 ℃, 500 ℃, 500 ℃ and 499 ℃.
Measuring the temperature every 150mm in the center direction of the third heating module layer, and detecting the temperature distribution from left to right at 400 ℃, 400 ℃, 400 ℃, 400 ℃ and 399 ℃.
Through detection, the temperature field is uniform in temperature distribution. Through drawing experiments, the thickness of a drawn flexible glass sample is 0.02mm, the thickness difference in the effective thickness is 3 mu m, and the warping degree is 0.005%. The drawn glass plate is uniform in thickness, flat and smooth and free of wavy lines.
Example 7
The glass composition of this example comprises, in weight percent, SiO2 62.5％，Al2O3 0.7％，CaO 1.9％，MgO 8.3％，Na2O 6％，B2O3 12％,Bi2O3 3％，K2O 0.1％，CeO 2 5％，P2O50.5 percent. Before the glass broken particles are melted, nitrogen is firstly used for flushing for 1min, and the melted glass flows out through a platinum slit with the width of 2 mm.
The heating modules in the shaping furnace are divided into 3 layers and 6 groups, each group of heating modules consists of 5 heating modules, the cross sectional area of the first layer of heating modules is 100 multiplied by 120mm, and the cross sectional areas of the second layer of heating modules and the third layer of heating modules are 120 multiplied by 200 mm. The front end of each group of heating modules is provided with a polycrystalline silicon carbide plate, the distance between the bottom edge of the first layer of polycrystalline silicon carbide plate and the glass belt is 12mm, and the distance between the bottom edges of the second layer of polycrystalline silicon carbide plate and the third layer of polycrystalline silicon carbide plate and the glass belt is 20 mm. The position of the heating module away from the glass belt is adjusted forwards and backwards, so that the transverse temperature field is uniform. The temperature of the central glass belt of the first heating module layer is controlled to be 710 ℃, the temperature of the central glass belt of the second heating module layer is controlled to be 500 ℃, and the temperature of the central glass belt of the third heating module layer is controlled to be 400 ℃.
And adjusting the cooling device, wherein the cooling medium is cold water or cold air, the distance between the T-shaped cooling pipe and the glass ribbon is adjusted by 60mm from the left and right, and the distance between the L-shaped cooling pipe of the glass edge cooling device and the glass edge is adjusted by 30mm from the front and back.
And adjusting the rotating speed of the edge roller and the drawing roller, wherein the rotating speed of the edge roller is controlled at 25mm/s, and the rotating speed of the drawing roller is controlled at 30 mm/s.
Measuring the temperature every 150mm in the center direction of the first heating module layer, and detecting the temperature distribution from left to right as 739 ℃, 740 ℃, 740 ℃, 739 ℃ and 739 ℃.
Measuring a temperature every 150mm in the center direction of the heating module at the second layer, and detecting the temperature distribution from left to right as 499 ℃, 500 ℃, 500 ℃, 500 ℃ and 499 ℃.
Measuring the temperature every 150mm in the center direction of the third heating module layer, and detecting the temperature distribution from left to right at 400 ℃, 400 ℃, 400 ℃, 400 ℃ and 399 ℃.
Through detection, the temperature field is uniform in temperature distribution. Through drawing experiments, the thickness of a drawn flexible glass sample is 0.023mm, the thickness difference in the effective thickness is 4 mu m, and the warping degree is 0.009%. The drawn glass plate is uniform in thickness, flat and smooth, and free of wavy lines, and polishing treatment is not needed.
In the process of drawing the flexible glass, the flexible glass is transited from a molten high-temperature area to a low-temperature area close to solid, the temperature change is large, wavy waste materials are easy to appear or secondary polishing is needed, and the rate of finished products is reduced. Na (Na)2O、K2O forms a mixed base effect, B2O3With Al2O3、SiO2Forming a solid solution mixture, wherein the five components act together to reduce the surface tension of the glass; MgO, CaO, Bi2O3、CeO2、P2O5The stability of the glass is increased, the high-temperature viscosity of the glass is reduced, the material property of the glass is improved, and the viscosity-temperature curve of the glass is adjusted, so that the influence of the temperature on the glass is reduced.
The flexible glass is extremely difficult to polish due to the characteristic that the flexible glass is light to thin, so that the glass is broken easily and the yield is reduced.
Claims (5)
1. A shaping method suitable for drawing flexible glass is characterized in that the shaping furnace comprises three layers of symmetrically arranged heating modules, a polycrystalline silicon carbide soaking plate is arranged on one side of each heating module, which faces to the glass ribbon, a cooling device is arranged between a first layer of heating module and a second layer of heating module, the head of the edge roller is arranged between the first layer of symmetrically arranged heating modules, and traction rollers are arranged between the second layer of heating module and the third layer of symmetrically arranged heating modules;
the polycrystalline silicon carbide soaking plates in the first layer are obliquely arranged, and the included angle between the polycrystalline silicon carbide soaking plates and the horizontal line is 60 degrees;
glass edge cooling devices are arranged between the adjacent heating modules on the second layer and between the adjacent heating modules on the third layer;
the glass edge cooling device is an L-shaped cooling water pipe, and the L-shaped cooling water pipe can horizontally move far and near relative to the edge of the glass ribbon.
2. A sizing method as claimed in claim 1 wherein each layer includes at least 1 pair of symmetrically disposed heating modules, each set of heating modules including at least 3 pairs of symmetrically disposed heating elements, each heating element being individually retractable back and forth relative to the glass ribbon.
3. A sizing method suitable for drawing flexible glass according to claim 1 wherein the polycrystalline silicon carbide soaking plates in the second and third layers are positioned vertically to the horizontal plane.
4. A sizing method suitable for drawing flexible glass as defined in claim 1 wherein said cooling means is a T-shaped cooling water tube, said T-shaped cooling water tube being horizontally movable in a direction of travel relative to the surface of the glass ribbon.
5. A sizing method suitable for flexible glass drawing according to claim 1, wherein the linear speed of the edge roller is controlled to be 10-40mm/s and the linear speed of the pulling roll is controlled to be 15-45 mm/s.
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| CN110255863B (en) * | 2019-07-22 | 2023-04-25 | 山东柔光新材料有限公司 | Flexible glass plate root control system and control method thereof |
| CN110746095B (en) * | 2019-09-29 | 2022-07-22 | 彩虹显示器件股份有限公司 | Substrate glass production forming equipment with refined temperature adjustment function |
| CN111470762B (en) * | 2020-04-29 | 2021-05-07 | 四川虹科创新科技有限公司 | Flexible glass and preparation method and preparation device thereof |
| CN111646676B (en) * | 2020-07-01 | 2023-09-22 | 彩虹显示器件股份有限公司 | Device and method for controlling substrate glass forming temperature field |
| CN112340965B (en) * | 2020-12-08 | 2024-08-09 | 河北省沙河玻璃技术研究院 | Production device and production method of flexible glass |
| CN113135649B (en) * | 2021-04-29 | 2022-05-17 | 中建材（蚌埠）光电材料有限公司 | UTG glass sheet production forming method and forming device |
| CN114956523B (en) * | 2022-06-28 | 2023-10-24 | 石家庄旭新光电科技有限公司 | Flexible glass edge drawing traction device and production equipment |
| CN117776500A (en) * | 2023-12-28 | 2024-03-29 | 重庆鑫景特种玻璃有限公司 | Device for reducing thickness difference of glass plate |
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