CN114956533B - Preparation method and device for ultrathin flexible glass - Google Patents
Preparation method and device for ultrathin flexible glass Download PDFInfo
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- CN114956533B CN114956533B CN202210497965.0A CN202210497965A CN114956533B CN 114956533 B CN114956533 B CN 114956533B CN 202210497965 A CN202210497965 A CN 202210497965A CN 114956533 B CN114956533 B CN 114956533B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/10—Annealing glass products in a continuous way with vertical displacement of the glass products
- C03B25/12—Annealing glass products in a continuous way with vertical displacement of the glass products of glass sheets
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The application relates to the technical field of ultrathin glass preparation, and provides a method and a device for preparing ultrathin flexible glass, wherein the method comprises the following steps of S1, preheating a glass raw sheet; s2, carrying out heating forming on the preheated glass raw sheet, wherein three temperature fields with different temperatures, namely a first temperature field, a second temperature field and a third temperature field, are arranged in the width direction of the glass raw sheet, the first temperature field is positioned in the middle, the second temperature field and the third temperature field are sequentially and symmetrically arranged at two sides of the first temperature field, and the total width of the three temperature fields is larger than or equal to the width of the glass raw sheet; and S3, annealing the glass raw sheet. Through above-mentioned technical scheme, solve wedge limit portion width too big among the prior art and lead to the high problem of material unrestrained rate.
Description
Technical Field
The application relates to the technical field of ultrathin glass preparation, in particular to a method and a device for preparing ultrathin flexible glass.
Background
The ultrathin flexible glass (UTG) is ultrathin glass with the thickness less than or equal to 0.1mm, and is a new material with great application value, which has the advantages of glass and plastic and is newly developed internationally in recent years. UTG has wide target market and urgent application requirements in the fields of flexible display, flexible printing, space environment and the like.
The existing preparation process of the ultrathin flexible glass mainly comprises a float method, an overflow down-draw method, a narrow slit down-draw method, a chemical thinning method and a secondary down-draw method. Float, overflow down-draw and slot down-draw are one-shot forming techniques, specifically, one-shot hot-drawing of molten glass to produce ultra-thin flexible glass. The one-step molding technology has great difficulty, and few enterprises master the technology at present. The chemical thinning method and the secondary down-draw method are secondary forming technology, the process is relatively simple, and the method is suitable for preparing small-batch ultrathin flexible glass.
In the process of preparing ultrathin flexible glass by adopting a secondary down-draw method, a glass raw sheet is heated to a temperature above a softening point and then is pulled by a pulling roll. The edge of the glass is contracted due to the surface tension of the glass, so that a wedge-shaped edge structure is formed. Drawing is carried out by adopting a glass raw sheet with the thickness of 5mm, and the width of the wedge-shaped edge part reaches more than 50 mm. For ultrathin flexible glass finished products, the wedge-shaped edge parts are all required to be cut off, and the waste of glass materials is seriously caused.
Disclosure of Invention
The application provides a preparation method and a preparation device of ultrathin flexible glass, which solve the problem of high material waste rate caused by overlarge width of a wedge-shaped edge in the related technology.
The technical scheme of the application is as follows:
the preparation method of the ultrathin flexible glass comprises the following steps of,
s1, preheating a glass raw sheet;
s2, performing heating forming on the preheated glass raw sheet, wherein three temperature fields with different temperatures, namely a first temperature field, a second temperature field and a third temperature field, are arranged in the width direction of the glass raw sheet, the first temperature field is positioned in the middle, the second temperature field and the third temperature field are sequentially and symmetrically arranged at two sides of the first temperature field, and the total width of the three temperature fields is larger than or equal to the width of the glass raw sheet;
and S3, annealing the glass raw sheet.
The width L1 of the first temperature field is 40mm-60mm smaller than the width of the glass raw sheet, and the width L2 of the second temperature field is in the range of: l2 is more than or equal to 10mm and less than or equal to 20mm, and the width L3 of the third temperature field is more than or equal to 20mm and less than or equal to 40mm.
The temperature difference of the first temperature field area is 0-5 ℃.
The temperature of the first temperature field is that the viscosity of glass is between 10 6.6 Pa·S～10 4 The characteristic temperature corresponding to Pa.S, the temperature of the second temperature field is 10-20 ℃ higher than that of the first temperature field, and the temperature of the third temperature field is at least 150 ℃ lower than that of the first temperature field.
The total width of the first temperature field, the second temperature field and the third temperature field is 10mm-30mm larger than the width of the glass raw sheet.
The feeding speed of the glass raw sheet is 0.3-1 mm/s, and the traction discharging speed is 20-100 mm/s.
The annealing temperature in step S3 is lower than the glass viscosity by 10 12.4 Characteristic temperature corresponding to Pa.S.
The ultrathin flexible glass preparation device comprises a preheating zone, a heating shaping zone and an annealing zone, wherein the preheating zone, the heating shaping zone and the annealing zone are sequentially arranged along the length direction, a feeding roller is arranged on one side of the preheating zone, and a discharging traction roller is arranged on one side of the annealing zone.
The heating element is provided with a first heat insulating sheet and a second heat insulating sheet on one side facing the glass raw sheet, the first heat insulating sheet is correspondingly arranged on one side of the first temperature field, and the second heat insulating sheet is correspondingly arranged on one side of the third temperature field.
The heating elements are in a zigzag shape, and the distance between the two heating elements corresponding to the second temperature field range is minimum.
The annealing zone comprises an annealing heating wire, and one side of the annealing heating wire, which is close to the glass raw sheet, is provided with a homogenizing plate.
The working principle and the beneficial effects of the application are as follows:
1. in the application, the preparation of the ultrathin glass mainly comprises three steps of preheating, heating forming and annealing, wherein the thickness selection range of the glass raw sheet is 4-6 mm, and the step S1 mainly aims to preheat the glass raw sheet in advance and prevent the glass from cracking in the thinning process. The heating is the core area of ultra-thin flexible glass shaping, and the structure and the heating temperature of the heating shaping area directly determine the shaping quality of the ultra-thin flexible glass. The three temperature fields with different temperatures are arranged, so that different areas of the glass sheet are heated differently, the width of the wedge-shaped part at the edge can be reduced while the heated extension thinning is ensured, and the availability of the ultrathin glass is improved. The total width of the three temperature fields is larger than the width of the glass raw sheet, so that the edge of the glass raw sheet can be heated. The annealing zone is used for mainly annealing the formed ultrathin flexible glass, so that the internal stress of the glass is reduced.
The shrinkage rate of the ultrathin flexible glass prepared by the application is controlled below 15%, the width of the wedge-shaped edge is less than or equal to 20mm, and the glass yield is greatly improved.
Drawings
The application will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic view of the shape and structure of the extended ultra-thin glass of the present application;
FIG. 2 is a schematic diagram of the location of three temperature fields according to the present application;
FIG. 3 is a schematic diagram of the overall structure of the preparation apparatus of the present application;
FIG. 4 is a schematic view of a first embodiment of a heating element of the present application;
FIG. 5 is a schematic view of a second embodiment of a heating element according to the present application;
in the figure: the device comprises a 1-preheating zone, a 2-heating shaping zone, a 3-annealing zone, a 4-feeding roller, a 5-discharging traction roller, a 6-heating element, a 7-cooling element, an 8-first heat insulation sheet, a 9-second heat insulation sheet, a 10-heating wire, an 11-homogenizing plate, a 12-first temperature field, a 13-second temperature field and a 14-third temperature field.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in FIGS. 1-5, the application provides a preparation method of ultrathin flexible glass, which comprises
S1, preheating a glass raw sheet;
s2, performing heating forming on the preheated glass raw sheet, wherein three temperature fields with different temperatures, namely a first temperature field 12, a second temperature field 13 and a third temperature field 14, are arranged in the width direction of the glass raw sheet, the first temperature field 12 is positioned in the middle, the second temperature field 13 and the third temperature field 14 are sequentially and symmetrically arranged on two sides of the first temperature field 12, and the total width of the three temperature fields is larger than or equal to the width of the glass raw sheet;
and S3, annealing the glass raw sheet.
In the embodiment, the preparation of the ultrathin glass mainly comprises three steps of preheating, heating forming and annealing, wherein the thickness selection range of a glass raw sheet is 4-6 mm, and the glass raw sheet can be selected from soda-lime-silica glass, high-alkali aluminosilicate glass, borosilicate glass, alkali-free aluminoborosilicate glass and the like. The step S1 is mainly used for preheating the glass raw sheet in advance and preventing the glass from cracking in the thinning process. The heating is the core area of ultra-thin flexible glass shaping, and the structure and the heating temperature of heating zone have directly decided ultra-thin flexible glass's shaping quality. The three temperature fields with different temperatures are arranged, so that different areas of the glass sheet are heated differently, the width of the wedge-shaped part at the edge can be reduced while the heated extension thinning is ensured, and the availability of the ultrathin glass is improved. The total width of the three temperature fields is larger than the width of the glass raw sheet, so that the edge of the glass raw sheet can be heated. The annealing zone is used for mainly annealing the formed ultrathin flexible glass, so that the internal stress of the glass is reduced.
The shrinkage rate of the ultrathin flexible glass prepared by the application is controlled below 15%, the width of the wedge-shaped edge is less than or equal to 20mm, and the glass yield is greatly improved.
Further, the number of the first temperature fields 12 is one, two second temperature fields 13 and two third temperature fields 14 are arranged, the two second temperature fields 13 are positioned on two symmetrical sides of the first temperature field 12, and the third temperature field 14 is positioned on one side, away from the first temperature field 12, of the second temperature field 13.
In this embodiment, the first temperature field 12 is in the middle, and the second temperature field 13 and the third temperature field 14 are sequentially disposed on both sides of the first temperature field 12. The glass raw sheet can be symmetrically heated, so that the change rates of the two edges of the glass in the width direction are consistent.
Further, the width L1 of the first temperature field 12 is 40mm to 60mm smaller than the width of the glass sheet, and the width L2 of the second temperature field 13 is in the range of: l2 is more than or equal to 10mm and less than or equal to 20mm, and the width L3 of the third temperature field 14 is more than or equal to 20mm and less than or equal to 40mm.
In this embodiment, the width ranges of the different temperature fields are different, and the glass raw sheet can be heated to different degrees according to the position and the temperature of the position, so that the deformation of the glass raw sheet in the different temperature fields is controlled, and the glass stretched can meet the thickness requirement of the ultrathin glass and has smaller edge shrinkage.
Further, the temperature difference in the region of the first temperature field 12 is 0-5 ℃.
In this embodiment, the temperature difference on the same horizontal line of the first temperature field 12 is less than or equal to 5 ℃, so that the consistency of viscosity in the original glass sheet thinning process is fully ensured.
Further, the temperature of the first temperature field 12 is such that the glass viscosity is between 10 6.6 Pa·S～10 4 The characteristic temperature corresponding to Pa.S, the temperature of the second temperature field 13 is 10-20 ℃ higher than that of the first temperature field 12, and the temperature of the third temperature field 14 is at least 150 ℃ lower than that of the first temperature field 12.
In this embodiment, the temperature relationships corresponding to the three temperature fields are: the third temperature field 14 is smaller than the first temperature field 12 and smaller than the second temperature field 13, and the third temperature field 14 is 150 ℃ lower than the first temperature field 12, so that the edge of the glass sheet can be rapidly fixed and prevented from shrinking inwards. The second temperature field 13 is 10-20 c higher than the first temperature field 12, which effectively prevents the inward expansion of the wedge-shaped edge portion and forms a good boundary with the effective area of the glass sheet.
Further, the total width of the three temperature fields of the first temperature field 12, the second temperature field 13 and the third temperature field 14 is 10mm to 30mm larger than the width of the glass raw sheet.
In this embodiment, the width w=l1+2l2+20mm of the glass sheet is smaller than the total length of the three temperature fields by 10-30mm, so that the edge of the glass sheet can be uniformly heated by the third temperature field 14, and the inward shrinkage of the glass edge can be effectively prevented. When the width of the glass edge is too small, the drawn glass is easy to shrink; when the width of the glass edge is too large, the glass edge is not melted well.
Further, the feeding speed of the glass raw sheet is 0.3-1 mm/s, and the traction discharging speed is 20-100 mm/s.
In the embodiment, the traction discharging speed is larger than the feeding speed, so that the stretching and thinning can be realized after the heating. Meanwhile, the breakage caused by the fact that the glass is not stretched and broken due to the fact that the traction discharging speed exceeds the feeding speed can be avoided.
Further, the annealing temperature in step S3 is lower than the glass viscosity by 10 12.4 Characteristic temperature corresponding to Pa.S.
In the embodiment, the too high annealing temperature can affect the shaping of the glass, and the glass can soften and deform to increase the thickness of the glass; below the lower annealing temperature limit, the glass structure is fixed and the internal particles cannot move and cannot disperse or eliminate stress.
The specific test results for the ultra-thin glass articles obtained by the above-described tests are shown in Table 1.
Table 1 test results of ultra thin glass articles of examples 1 to 9 and comparative examples 1 to 2
As is clear from the above table, according to the steps of the present application, using the parameter ranges defined by the present application, it is possible to obtain an ultra-thin glass product conforming to the thickness of the glass effective region of 0.1mm or less and the width of the tapered edge of 20mm or less. When the temperature of the second temperature field 13 is equal to that of the first temperature field 12, and the other parameters are the same, the width of the glass after being stretched is reduced, the width of the wedge-shaped edge part is increased, and the width of the effective area of the glass is not greatly changed compared with the prior art; when the temperature of the third temperature field 14 is equal to the temperature of the first temperature field 12, and the other parameters are the same, the width of the stretched glass is reduced, the shrinkage rate is increased, the width of the wedge-shaped edge part is increased, the thickness of the usable area of the glass is increased, and the requirement of ultra-thin glass is not met.
The ultrathin flexible glass preparation device comprises a preheating zone 1, a heating shaping zone 2 and an annealing zone 3 which are sequentially arranged along the length direction, wherein a feeding roller 4 is arranged on one side of the preheating zone 1, a discharging traction roller 5 is arranged on one side of the annealing zone 3, the heating shaping zone 2 comprises heating elements 6 arranged on the upper side and the lower side of a glass sheet, the width of each heating element 6 is equal to the total width of three temperature fields, and cooling elements 7 are arranged on two sides of the width direction of each heating element 6.
In this embodiment, the glass raw sheet enters the preheating zone 1 for preheating under the guidance of the feeding roller, enters the heating zone after the preheating is completed, the glass raw sheet is formed in the heating zone, then is annealed in the annealing zone 3, finally forms ultrathin flexible glass under the traction of the traction roller 5, and the temperature field of the heating zone is adjusted to form three first temperature fields 12, second temperature fields 13 and third temperature fields 14 with different temperatures by arranging the heating element 6 and the cooling element 7.
Further, the heating element 6 is provided with a first heat insulating sheet 8 and a second heat insulating sheet 9 on the side facing the glass precursor, the first heat insulating sheet 8 being correspondingly provided on the side of the first temperature field 12, the second heat insulating sheet 9 being correspondingly provided on the side of the third temperature field 14.
In the first embodiment of the heating element 6, the heating element 6 is a heating flat plate, and the first heat insulating sheet 8 and the second heat insulating sheet 9 are arranged on the heating element 6 to shield the heating element 6 at the middle part and the edge part respectively, so that the temperature of the second temperature field 13 is the highest, the first temperature field 12 is lower, and the temperature of the third temperature field 14 is the lowest.
Further, the heating elements 6 are in a zigzag shape, and the distance between the two heating elements 6 corresponding to the range of the second temperature field 13 is minimum.
In the second embodiment of the heating element 6, the heating element 6 has a two-sided symmetrical folded line shape, and three temperature fields with different temperatures are formed by adjusting the distances between different positions of the heating element 6 and the plane of the glass sheet, so that the highest temperature of the second temperature field 13 can be controlled.
Further, the annealing zone 3 comprises an annealing heater wire 10, and a homogenizing plate 11 is arranged on the side of the annealing heater wire 10 close to the glass raw sheet.
In this embodiment, the homogenizing plate 11 is made of silicon carbide, and the excellent heat conduction property of the material can keep the annealing temperature of the annealing zone 3 balanced.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the application.
Claims (8)
1. The preparation method of the ultrathin flexible glass is characterized by comprising the following steps of,
s1, preheating a glass raw sheet;
s2, performing heating forming on the preheated glass raw sheet, wherein a first temperature field (12), a second temperature field (13) and a third temperature field (14) are arranged in the width direction of the glass raw sheet, the first temperature field (12) is positioned in the middle, the second temperature field (13) and the third temperature field (14) are sequentially and symmetrically arranged on two sides of the first temperature field (12), and the total width of the three temperature fields is larger than or equal to the width of the glass raw sheet;
s3, annealing the glass raw sheet,
the width L1 of the first temperature field (12) is 40mm-60mm smaller than the width of the glass raw sheet, and the width L2 of the second temperature field (13) is in the range of: 10 The width L3 of the third temperature field (14) is 20mm or less and L2 or less and 20mm or less, the width L3 is 20mm or less and 40mm or less,
the temperature of the first temperature field (12) in the step S2 is that the glass viscosity is between 10 6.6 Pa·S~10 4 Characteristic temperature corresponding to Pa.S, temperature of the second temperature field (13)The temperature is 10-20 ℃ higher than the temperature of the first temperature field (12), the temperature of the third temperature field (14) is at least 150 ℃ lower than the temperature of the first temperature field (12), and the annealing temperature in the step S3 is lower than the glass viscosity of 10 12.4 Characteristic temperature corresponding to Pa.S.
2. The method of manufacturing ultra-thin flexible glass according to claim 1, wherein the temperature difference in the region of the first temperature field (12) is 0-5 ℃.
3. The method for preparing the ultrathin flexible glass according to claim 1, wherein the total width of the three temperature fields of the first temperature field (12), the second temperature field (13) and the third temperature field (14) is 10mm to 30mm larger than the width of the glass raw sheet.
4. The method for preparing the ultrathin flexible glass according to claim 1, wherein the feeding speed of the glass raw sheet is 0.3-mm/s-1 mm/s, and the traction discharging speed is 20-mm/s-100 mm/s.
5. The ultrathin flexible glass preparation device is prepared by using the ultrathin flexible glass preparation method according to any one of claims 1-4, and comprises a preheating zone (1), a heating shaping zone (2) and an annealing zone (3) which are sequentially arranged along the length direction, wherein heating wires (10) are arranged in the preheating zone (1) and the annealing zone (3), a feeding roller (4) is arranged on one side of the preheating zone (1), and a discharging traction roller (5) is arranged on one side of the annealing zone (3), and the ultrathin flexible glass preparation device is characterized in that the heating shaping zone (2) comprises heating elements (6) arranged on the upper side and the lower side of a glass sheet, the width of each heating element (6) is equal to the total width of three temperature fields, and cooling elements (7) are arranged on two sides of the width direction of each heating element (6).
6. The ultrathin flexible glass preparation device according to claim 5, wherein a first heat insulating sheet (8) and a second heat insulating sheet (9) are arranged on one side of the heating element (6) facing the glass raw sheet, the first heat insulating sheet (8) is correspondingly arranged on one side of the first temperature field (12), and the second heat insulating sheet (9) is correspondingly arranged on one side of the third temperature field (14).
7. The ultrathin flexible glass preparation device according to claim 5, wherein the heating elements (6) are in a zigzag shape, and the distance between the two heating elements (6) corresponding to the range of the second temperature field (13) is minimum.
8. The ultrathin flexible glass production apparatus according to claim 6 or 7, wherein the annealing zone (3) is provided with a homogenizing plate (11), the homogenizing plate (11) being arranged on one side of the heating wire (10) of the annealing zone (3) close to the glass raw sheet.
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| CN111470762A (en) * | 2020-04-29 | 2020-07-31 | 四川旭虹光电科技有限公司 | Flexible glass and preparation method and preparation device thereof |
| DE202020103631U1 (en) * | 2020-06-24 | 2020-07-06 | Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg | Device for producing a wedge-shaped glass pane |
| CN112979146A (en) * | 2021-03-01 | 2021-06-18 | 北京工业大学 | Method for preparing flexible glass by redraw method |
| CN113696566A (en) * | 2021-08-16 | 2021-11-26 | 张志才 | Preparation process and equipment of ultrathin flexible glass lamination |
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