Thick plate glass, method for producing the same, and use thereof

Abstract

The application relates to the technical field of glass production, and particularly discloses thick plate glass, a preparation method thereof and application. The preparation method comprises the following steps: preheating: after the glass is placed, the glass is preheated in a preheating furnace, the upper surface preheating temperature of the preheating furnace is set to be 320-360 DEG C, the lower surface preheating temperature of the preheating furnace is set to be 310-350 DEG C, and the preheating convection fan rotating speed efficiency is set; heating: after the glass is preheated, the glass is heated in a heating furnace, the glass moves in the heating furnace, the upper surface heating temperature of the heating furnace is set to be 680-690 DEG C, the lower surface heating temperature of the heating furnace is set to be 670-680 DEG C, and the thick plate glass is prepared after the heating is completed. The application reduces the loss of the furnace corner part of convection, increases the heating efficiency of the middle part of convection, thereby improving the overall quality of the thick plate glass, reducing the thermal spot and the white mist appearing in the middle part of the glass. In addition, the heating is more reasonable, electricity is saved, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of glass production technology, specifically to a thick plate glass, its preparation method, and its application. Background Technology

[0002] In the traditional tempered glass production process, the following points require special attention: 1. Temperature control: When tempering ordinary transparent flat glass, the minimum glass temperature is usually required to reach above its transition temperature (Tg), i.e., 40-50℃. However, an imbalance between heat supply and heat absorption by the glass can lead to physical bending during heat absorption, thus affecting the overall performance of the glass. 2. Cooling rate: The common method of physical tempering is air-cooled tempering, which involves heating the glass to below its softening temperature and then uniformly and rapidly cooling it. During this process, the outer layer cools and solidifies rapidly, while the inner layer cools more slowly, thereby generating compressive stress and enhancing the strength of the glass. For thick glass, excessively rapid or uneven cooling may cause breakage. 3. Production efficiency and quality control: Traditional tempering methods suffer from low productivity and product defects, prompting the industry to seek more efficient operating methods to improve productivity and product quality.

[0003] The main drawbacks of existing tempering technologies are the tendency for problems such as corner chipping and overheating spots to occur during the heating process of thick glass, as they fail to apply appropriate heat based on the glass's thermal history. Therefore, it is necessary to provide a method for preparing thick glass, its manufacturing process, and its applications to better control the quality of the glass surface and reduce production costs. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a thick plate glass, its preparation method, and its application, thereby better controlling the quality of the glass surface and reducing production costs.

[0005] The inventive concept of this invention is to create a spherical temperature field by adjusting the heating element, heating power, and heat convection function to reduce convection losses at the corners of the furnace and increase the heating efficiency of the central convection section, thereby improving the overall quality. 1. The glass enters the preheating furnace for heating, at which point low-temperature, slow-speed heating parameters are activated; 2. After preheating, the glass enters the heating furnace, and the rate of heat supply is adjusted by changing the heating power and set temperature to match the rate of heat absorption by the glass.

[0006] The preheating parameters emphasize a slow, low-heat supply to accommodate the slow heat absorption characteristic of thick glass in the early stages due to its thickness gradient. The most obvious example is the uneven heat absorption rates between the surface and interior layers caused by the thickness difference. However, as the glass gradually approaches its softening temperature in the later stages, the temperature difference across the thickness decreases significantly, while the heat absorption rate slowly declines, leading to gradual softening. To address the asynchronous heat absorption between the surface and interior layers of thick glass caused by the thickness difference, two heating methods are employed for adjustment. Optimization is achieved through preheating temperature variations at the top and bottom, convection model design, and spatial design of the temperature field. Finally, a multimodal temperature control model is used to integrate these factors.

[0007] The first aspect of the present invention provides a method for preparing thick plate glass.

[0008] Specifically, it includes the following steps:

[0009] Preheating: After the glass is loaded, it enters the preheating furnace for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320-360℃, and the preheating temperature of the lower surface of the preheating furnace is set to 310-350℃. The speed and efficiency of the preheating convection fan are also set.

[0010] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves inside the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680-690℃, and the heating temperature of the lower surface of the heating furnace is set to 670-680℃. After heating, thick glass is produced.

[0011] Preferably, the preheating temperature of the upper surface of the preheating furnace is greater than the preheating temperature of the lower surface of the preheating furnace.

[0012] Preferably, the heating temperature of the upper surface of the heating furnace is greater than the heating temperature of the lower surface of the heating furnace.

[0013] Preferably, the preheating convection fan speed efficiency includes the preheating convection fan speed efficiency on the upper surface of the glass and the preheating convection fan speed efficiency on the lower surface of the glass.

[0014] Preferably, the preheating convection fan on the upper surface of the glass has a rotational efficiency of 40-60%.

[0015] More preferably, the preheating convection fan on the upper surface of the glass has a rotational efficiency of 40-45%.

[0016] More preferably, the preheating convection fan on the upper surface of the glass has a rotational efficiency of 45%.

[0017] Preferably, the preheating convection fan on the lower surface of the glass has a rotational efficiency of 30-50%.

[0018] More preferably, the preheating convection fan on the lower surface of the glass has a rotational efficiency of 30-40%.

[0019] More preferably, the preheating convection fan on the lower surface of the glass has a rotational efficiency of 30%.

[0020] Preferably, the preheating time is 400–560 s.

[0021] More preferably, the preheating time is 400-500 seconds.

[0022] More preferably, the preheating time is 400s.

[0023] Preferably, the heating time is 400-500 seconds.

[0024] More preferably, the heating time is 450 seconds.

[0025] More preferably, the heating time is 400 seconds.

[0026] Preferably, the glass moves at a speed of 230–260 mm / s inside the heating furnace.

[0027] More preferably, the glass moves at a speed of 230-240 mm / s inside the heating furnace.

[0028] More preferably, the glass moves at a speed of 230 mm / s inside the heating furnace.

[0029] Preferably, the thickness of the glass is 12 to 19 mm.

[0030] More preferably, the thickness of the glass is 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, or 19mm.

[0031] More preferably, the thickness of the glass is 15 mm and 19 mm.

[0032] Preferably, the preheated temperature field is spherical. It should have a shape that gradually decreases in temperature from the center towards both ends.

[0033] Preferably, the preheated convection model is spherical. The fan speed is set to gradually decrease from the center outwards.

[0034] A second aspect of the present invention provides a thick plate glass.

[0035] Specifically, the thick glass is prepared by the preparation method provided in the first aspect of the present invention.

[0036] A third aspect of the present invention provides an application of thick plate glass in the field of energy-saving glass.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] This invention utilizes heating elements, heating power, and thermal convection to create a spherical temperature field, reducing convection losses at the furnace corners and increasing the heating efficiency of the central section. This improves the overall quality of thick glass and reduces hot spots and white fogging in the glass center. Furthermore, the heating process is more efficient, saving electricity and reducing production costs. Detailed Implementation

[0039] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0040] Unless otherwise specified, the raw materials, reagents or devices used in the following examples are available from conventional commercial sources or can be obtained by existing known methods.

[0041] Example 1

[0042] A thick plate glass and its preparation method.

[0043] The specific steps are as follows:

[0044] Preheating: After the 15mm thick glass is sheeted on the loading platform, it enters the preheating furnace via the transmission roller conveyor for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%, and the preheating time is 400s.

[0045] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves at a speed of 230 mm / s in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680℃ and the heating temperature of the lower surface of the heating furnace is set to 670℃. Heating is carried out for 400 seconds. After heating, thick glass is produced.

[0046] The temperature field is spherical, and a shape that gradually decreases from the center to both ends is required; the convection model is also spherical, and the fan speed is set to gradually decrease from the center to the surrounding area.

[0047] Processing results: The thick glass plate prepared in Example 1 has no chipped corners, no overheating spots, and meets the strength requirements.

[0048] Example 2

[0049] A thick plate glass and its preparation method.

[0050] The specific steps are as follows:

[0051] Preheating: After the 15mm thick glass is sheeted on the loading platform, it enters the preheating furnace via the transmission roller conveyor for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 350℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the preheating convection fan speed efficiency of the upper surface of the glass is 45%, the preheating convection fan speed efficiency of the lower surface of the glass is 30%, and the preheating time is 400s.

[0052] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves at a speed of 230 mm / s in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680℃ and the heating temperature of the lower surface of the heating furnace is set to 670℃. Heating is carried out for 400 seconds. After heating, thick glass is produced.

[0053] The temperature field is spherical, and a shape that gradually decreases from the center to both ends is required; the convection model is also spherical, and the fan speed is set to gradually decrease from the center to the surrounding area.

[0054] Processing results: The thick glass plate prepared in Example 2 had no chipped corners, no overheating spots, and qualified strength.

[0055] Comparative Example 1

[0056] A thick plate glass and its preparation method.

[0057] The specific steps are as follows:

[0058] Preheating: After the 15mm thick glass is sheeted on the loading platform, it enters the preheating furnace via the transmission roller conveyor for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320℃, the preheating temperature of the lower surface of the preheating furnace is set to 360℃, the preheating convection fan speed efficiency of the upper surface of the glass is 45%, the preheating convection fan speed efficiency of the lower surface of the glass is 30%, and the preheating time is 400s.

[0059] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves at a speed of 230 mm / s in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680℃ and the heating temperature of the lower surface of the heating furnace is set to 670℃. Heating is carried out for 400 seconds. After heating, thick glass is produced.

[0060] The temperature field is spherical, and a shape that gradually decreases from the center to both ends is required; the convection model is also spherical, and the fan speed is set to gradually decrease from the center to the surrounding area.

[0061] Processing results: The thick glass plate prepared in Comparative Example 1 had no chipped corners or overheating spots, but there was white fog in the middle area of ​​the glass, and the strength was up to standard.

[0062] Comparative Example 2

[0063] A thick plate glass and its preparation method.

[0064] The specific steps are as follows:

[0065] Preheating: After the 15mm thick glass is sheeted on the loading platform, it enters the preheating furnace via the transmission roller conveyor for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 450℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%, and the preheating time is 400s.

[0066] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves at a speed of 230 mm / s in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680℃ and the heating temperature of the lower surface of the heating furnace is set to 670℃. Heating is carried out for 400 seconds. After heating, thick glass is produced.

[0067] The temperature field is spherical, and a shape that gradually decreases from the center to both ends is required; the convection model is also spherical, and the fan speed is set to gradually decrease from the center to the surrounding area.

[0068] Processing results: The thick glass plate prepared in Comparative Example 2 showed an increased number of corner chipping incidents, no overheating spots, and qualified strength.

[0069] Comparative Example 3

[0070] A thick plate glass and its preparation method.

[0071] The specific steps are as follows:

[0072] Preheating: After the 15mm thick glass is sheeted on the upper sheeting platform, it enters the preheating furnace via the transmission roller conveyor for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 460℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%, and the preheating time is 400s.

[0073] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves at a speed of 230 mm / s in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680℃ and the heating temperature of the lower surface of the heating furnace is set to 670℃. Heating is carried out for 400 seconds. After heating, thick glass is produced.

[0074] The temperature field is spherical, and a shape that gradually decreases from the center to both ends is required; the convection model is also spherical, and the fan speed is set to gradually decrease from the center to the surrounding area.

[0075] Processing results: The thick glass plate prepared in Comparative Example 3 showed an increased number of corner chipping incidents, no overheating spots, and qualified strength.

[0076] Comparative Example 4

[0077] A thick plate glass and its preparation method.

[0078] The specific steps are as follows:

[0079] Preheating: After the 15mm thick glass is sheeted on the loading platform, it enters the preheating furnace via the transmission roller conveyor for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 350℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the preheating convection fan speed efficiency of the upper surface of the glass is 45%, the preheating convection fan speed efficiency of the lower surface of the glass is 30%, and the preheating time is 400s.

[0080] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves at a speed of 230 mm / s in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680℃ and the heating temperature of the lower surface of the heating furnace is set to 670℃. Heating is carried out for 400 seconds. After heating, thick glass is produced.

[0081] The temperature field is square, and a shape that gradually decreases from the center to both ends is required; the convection model is square, and the fan speed is set to gradually decrease from the center to the surrounding area.

[0082] Processing results: The thick glass plate prepared in Comparative Example 4 had no corner chipping, but the overheating spots were obvious, and the strength was up to standard.

[0083] Comparative Example 5

[0084] A thick plate glass and its preparation method.

[0085] The specific steps are as follows:

[0086] Preheating: After the 15mm thick glass is sheeted on the loading platform, it enters the preheating furnace via the transmission roller conveyor for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320℃, the preheating temperature of the lower surface of the preheating furnace is set to 360℃, the preheating convection fan speed efficiency of the upper surface of the glass is 45%, the preheating convection fan speed efficiency of the lower surface of the glass is 30%, and the preheating time is 400s.

[0087] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves at a speed of 230 mm / s in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680℃ and the heating temperature of the lower surface of the heating furnace is set to 670℃. Heating is carried out for 400 seconds. After heating, thick glass is produced.

[0088] The temperature field is square, and a shape that gradually decreases from the center to both ends is required; the convection model is square, and the fan speed is set to gradually decrease from the center to the surrounding area.

[0089] Processing results: The thick glass plate prepared in Comparative Example 5 had no corner chipping, but there were obvious overheating spots and white fog in the middle of the glass, and the strength was qualified.

[0090] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, any technical solutions obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concept of the present invention and on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for preparing thick plate glass, characterized in that, Includes the following steps: Preheating: After the glass is loaded, it enters a preheating furnace for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320~360℃, and the preheating temperature of the lower surface is set to 310~350℃. The speed efficiency of the preheating convection fan is also set. The preheating temperature of the upper surface of the preheating furnace is greater than that of the lower surface. The speed efficiency of the preheating convection fan includes the speed efficiency of the preheating convection fan on the upper surface of the glass and the speed efficiency of the preheating convection fan on the lower surface of the glass. The speed efficiency of the preheating convection fan on the upper surface of the glass is 40~60%, and the speed efficiency of the preheating convection fan on the lower surface of the glass is 30~50%. The preheating temperature field is spherical. Heating: After preheating, the glass enters the heating furnace for heating. The glass moves inside the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680~690℃, and the heating temperature of the lower surface of the heating furnace is set to 670~680℃. After heating, thick glass is produced. The heating time is 400~500s. The thickness of the glass is 12~19mm.

2. The preparation method according to claim 1, characterized in that, The heating temperature of the upper surface of the heating furnace is greater than the heating temperature of the lower surface of the heating furnace.

3. The preparation method according to claim 1, characterized in that, The preheating time is 400~560 s.

4. The preparation method according to claim 1, characterized in that, The glass moves at a speed of 230~260 mm / s inside the heating furnace.