WO2019019699A1

WO2019019699A1 - Thin tempered glass production method

Info

Publication number: WO2019019699A1
Application number: PCT/CN2018/082668
Authority: WO
Inventors: 赵雁; 李彦兵; 张喜宾
Original assignee: 洛阳兰迪玻璃机器股份有限公司
Priority date: 2017-07-26
Filing date: 2018-04-11
Publication date: 2019-01-31
Also published as: CN107586013A

Abstract

A thin tempered glass production method, comprising a step of heating a glass panel in a heating furnace, a step of transporting the heat-treated glass panel out of the heating furnace via a transport mechanism and introducing the glass panel into a cooling air grid for rapid cooling, a step of slow cooling, and a step of lowering the glass panel. While cooling, the surface and the core part of the glass panel are heated simultaneously, the rapid cooling allows the surface of the glass panel to be cooled rapidly, at the same time, the temperature of the core part of the glass panel is either kept unchanged or changes slightly due to heating, thus forming a temperature difference between the surface and the core part of the glass panel, increasing the tempering quality of the thin tempered glass, and allowing the thin tempered glass so produced to meet national building material tempered glass requirements.

Description

Thin tempered glass production method

Technical field

The invention relates to the field of glass tempering, in particular to a method for producing thin tempered glass.

Background technique

At present, the tempering of glass is mainly achieved in two ways: one is chemical tempering and the other is physical tempering. Chemical tempering is to place the glass in the molten alkali salt, so that the ions with smaller radius in the surface layer of the glass exchange with the ions with larger radius in the molten salt, and finally form a compressive stress layer on both surfaces of the glass to form a sheet in the interior of the glass. The stress layer achieves the purpose of improving the mechanical strength and temperature shock resistance of the glass. Physical tempering is when ordinary flat glass is heated in a heating furnace to a softening temperature close to glass, the internal stress is removed by its own deformation, and then the glass is removed from the heating furnace, and then the high-pressure cold air is blown to both sides of the glass by a multi-head nozzle, so that The tempered glass can be obtained by rapidly and uniformly cooling to room temperature.

For thinner glass, especially thin glass with a thickness of 3mm or less, due to the limited thickness of the glass, when the glass is quenched, the two surfaces and the core are almost simultaneously cooled, and it is difficult to form a temperature gradient from the surface to the core. It is also difficult to form a balance between the compressive stress generated by the glass surface and the internal tensile stress, and it is difficult for the thin plate glass to be completely tempered by the conventional physical tempering test.

When using traditional tempering methods to produce thin tempered glass, there are two main difficulties: First, in the process of thin glass discharging, the glass leaving the furnace door is rapidly cooled, which has a great influence on the quality of tempered glass; The tempering process of thin glass requires a large wind pressure.

In response to the first problem, a patent proposes a docking structure between the heating furnace body and the quenching section, and the convex nozzle structure is used to ensure that the glass surface leaving the furnace door still has a hot air flow, so that the glass does not cool rapidly. This design has a complicated structure and wastes energy. Each time the furnace door is opened, the airflow in the heating furnace is disturbed, which affects the stability of the heating furnace.

For the second problem, most of the prior art uses compressed air for cooling. The disadvantage of this solution is that the compressed air has a rapid drop in pressure after opening, and the pressure of the compressed air also changes with time. Will further decline, such pressure fluctuations will have a negative impact on the quality of thin glass tempering, another method is equipped with high-power high-pressure fans to provide high enough air pressure, the use of high-power high-pressure fans energy consumption Big and unsatisfactory.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the above prior art and to provide a method for producing a thin tempered glass which can continuously temper a thin glass plate having a thickness of less than 3 mm, and the tempering standard can meet the requirements of the national building material tempered glass.

The technical solution adopted by the present invention to achieve the above object is: a thin tempered glass production method, comprising the following steps:

(1) conveying the glass plate to the heating furnace through the conveying mechanism for tempering heating;

(2) sending the heat-treated glass plate to the heating furnace through the conveying mechanism, and feeding it into the cooling louver for quenching; wherein the cooling louver is provided with a plurality of heaters, while the glass plate is rapidly cooled, The heater simultaneously heats the surface of the glass plate and the core to form a temperature gradient from the surface of the glass plate to the core;

(3) After completing the step (2), the glass plate is slowly cooled after the quenching process;

(4) After completing the step (3), the glass plate is placed under the slow cooling process.

In the present invention, the conveying mechanism is a roller conveyor mechanism or an air flotation conveying mechanism.

In the present invention, the cooling louver uses a cast volute fan to output cooling air to the surface of the glass sheet.

In the present invention, the cooling louver includes an upper louver and a lower louver, and both the upper louver and the lower louver include at least one louver assembly disposed between adjacent louver assemblies in the same louver.

In the step (2) of the present invention, the glass plate is turned on before the quenching, so that when the glass plate is quenched, the heating power of the heater can reach the required efficiency.

In the present invention, preferably, a transition heating section is further disposed between the heating furnace and the cooling air grille, and the transition heating section includes a transition conveying mechanism (part of the conveying mechanism) and a heater that simultaneously heats the surface and the core of the glass sheet. .

Preferably, the heating temperature of the transition heating section is 630 to 650 °C.

In the present invention, the heater employs an infrared heater or a microwave heater.

Preferably, the heater employs an infrared heater having a wavelength of 1000 to 5000 nm.

Beneficial effect: After the thin glass plate is heated to the softening temperature by the heating furnace, the glass plate enters the cooling wind grid, and the glass plate starts to be quenched. Since the thickness of the thin glass plate is thin, the surface temperature of the glass plate is in the process of quenching. The temperature of the part is simultaneously lowered, and the temperature difference is not easily formed. However, in the present invention, the heater is installed in the cooling louver, the glass plate enters the cooling louver, and the surface of the glass plate and the core are simultaneously heated while being cooled. At this time, the glass plate is quenched. The surface is rapidly cooled, and at this time, the temperature of the core of the glass plate remains unchanged or changes less due to heating, thereby forming a temperature difference from the surface of the glass plate to the core, and improving the tempering quality of the tempered sheet glass. The obtained tempered thin glass can meet the requirements of national building materials tempered glass.

The heater of the invention adopts infrared heating or microwave heating, can transfer heat to the core of the thin glass plate, form a temperature gradient from the core to the surface of the thin glass plate, and maintain the compressive stress and the tensile stress generated on the surface of the glass. The balance improves the tempering effect of the thin glass.

The invention further comprises a heater between the heating furnace and the cooling wind grid, which mainly heats the surface of the glass plate and the core at the same time, maintains the temperature of the surface of the glass plate and the core, and avoids the cooling of the thin glass leaving the furnace door first. It affects the quality of tempered glass.

In the second step of the invention, the cooling louver adopts a cast volute high-pressure fan to output cooling air to the glass surface, instead of cooling air for cooling, which overcomes the pressure drop and pressure instability caused by the compressed air, and adversely affects the tempering quality of the thin glass. The problem.

DRAWINGS

Figure 1 is a schematic view of a heating furnace and a cooling damper of the present invention.

Reference numerals: 1, heating furnace, 2, conveying mechanism, 3, glass plate, 4, transition heating section, 5, cooling louver, 6, wind grid assembly, 7, heater, 8, wind gust, 9, downwind Grid, 10, transition conveying mechanism.

Detailed ways

The present invention is further described in conjunction with the specific drawings, and the scope of the present invention is not limited to the scope described in the specific embodiments.

A thin tempered glass production method, as shown in Figure 1, includes the following steps:

(1) The glass plate 3 is horizontally placed on the conveying mechanism 2, and the glass plate 3 is conveyed to the heating furnace 1 by the conveying mechanism 2 for tempering heating; in this step, the glass plate is heated to a tempering temperature of 650 to 720 °C.

(2) The glass plate 3 after the heat treatment is transported out of the heating furnace 1 by the transport mechanism 2, and the glass plate 3 is discharged at a speed of 100 to 1000 mm/s, and the glass plate 3 is transported into the cooling louver 5 by the transport mechanism 2 for cooling. The glass plate 3 of the output heating furnace 1 is first quenched in the cooling louver 5, and a plurality of heaters 7 for simultaneously heating the surface and the core of the glass plate are arranged in the cooling louver 5 to make the surface of the glass plate to the heart. The temperature gradient is formed; the glass plate opens the heater 7 before entering the cooling louver 5, so that when the glass plate enters the cooling louver 5, the heating power of the heater 7 can reach the required efficiency.

(3) After completing the step (2), the glass plate is slowly cooled after the quenching process until the glass plate reaches a local touch effect;

(4), under the glass plate.

The cooling louver 5 includes an upwind grid 8 and a downwind grid 9, each of which includes at least one wind grid assembly 6 disposed between adjacent wind grid assemblies 6 in the same wind grid. . The heaters 7 may be disposed between the wind grid assemblies 6 of the upwind grid 8, or between the wind grid assemblies 6 of the downwind grid 9, or at the same time the respective wind grid assemblies 6 disposed in the upwind grid 8 and the downwind grid 9. between.

In the present invention, the transport mechanism 2 is a roller conveyor mechanism or an air flotation transport mechanism. The conveying mechanism 2 and the transition conveying mechanism 10 illustrated in Fig. 1 are both roller conveyor mechanisms; the roller conveyor mechanism may be replaced with an air flotation conveying mechanism according to the prior art.

As shown in FIG. 1, a transition heating section 4 is further provided between the heating furnace 1 and the cooling louver 5, and the transition heating section 4 includes a transition conveying mechanism 10 for conveying the glass sheet 3 outputted from the heating furnace 1, and transitions. A heater 7 for simultaneously heating the surface and the core of the glass sheet 3 is provided above and below the conveying mechanism 10.

Among them, the cooling louver 5 uses a cast volute high-pressure fan to output cooling air to the surface of the glass plate 3. In the present invention, the heater is installed in the transition heating section and the cooling louver, and the heater 7 provided in the transition heating section 4 and the cooling louver 5 is an infrared heater or a microwave heater. When infrared heating is employed, the wavelength of the infrared light is 1000 to 5000 nm, preferably, infrared rays having a wavelength of 2000 to 3000 nm are used; and microwave heating is performed, and the wavelength is 1 to 1000 mm. Among them, infrared heating can achieve fixed-point heating, and the heating effect of the core of the glass plate is better.

Preferably, the heating temperature of the transition heating section 4 is 630 to 650 ° C, which is within the softening temperature range of the glass.

Example 1

A thin tempered glass production method comprises the following steps: (1) placing the glass plate 3 horizontally on the conveying mechanism 2, and conveying the glass plate 3 to the heating furnace 1 through the conveying mechanism 2 for tempering heating, the heating temperature is 700 °C, wherein the specification of the glass plate 3 is length × width = 600 mm × 400 mm, glass plate thickness D = 2.5 mm, glass plate heating time t = 105 s; (2), the heat-treated glass plate 3 is passed through the conveying mechanism 2 The heating furnace 1 is conveyed, the glass plate 3 is discharged at a speed of 400 mm/s, and the glass plate is conveyed by the conveying mechanism 2 into the cooling louver 5 for cooling, and the glass plate 3 of the output heating furnace 1 is first quenched in the cooling louver 5. At the same time, a plurality of heaters 7 for simultaneously heating the surface and the core of the glass plate 3 are arranged on the cooling louver 5 to form a temperature gradient from the surface to the core of the glass plate 3; the glass plate 3 turns on the heater 7 before quenching, When the glass sheet 3 is quenched, the heating power of the heater 7 can achieve the required efficiency. Among them, the heater 7 is heated by infrared rays having a wavelength of 2000 to 3000 nm, and the wind pressure is set to a rated wind pressure of 95%.

(3) After completing the step (2), the glass plate 3 is slowly cooled after the quenching process until the glass plate 3 reaches a local touch effect;

(4), under the glass plate.

The thin tempered glass obtained in this example has a particle size of 55 particles in a 50 mm × 50 mm square.

Example 2

A thin tempered glass production method comprises the following steps: (1) heat treatment: horizontally placing the glass plate 3 on the conveying mechanism 2, and conveying the glass plate 3 to the heating furnace 1 through the conveying mechanism 2 for tempering heating, heating temperature 650 ° C, wherein the specification of the glass plate 3 is length × width = 600 mm × 400 mm, glass plate heating time t = 100 s;

(2) Temperature compensation treatment in the transition heating section: the heat-treated glass sheet is conveyed out of the heating furnace 1 through the conveying mechanism 2, the glass sheet is discharged at a speed of 500 mm/s, and enters the transition conveying mechanism 10, and the transition conveying mechanism 10 is installed with a plurality of A heater which mainly heats the surface and the core of the glass plate 3 at a heating temperature of 630 ° C to maintain the surface of the glass plate 3 and the temperature of the core.

(3) Quenching process: the glass plate 3 enters the cooling louver 5 after passing through the transition conveying mechanism 10, at which time the cooling louver 5 provides a higher wind pressure, and the surface of the glass plate 3 can be rapidly cooled while cooling some of the louver The heater heats the surface of the glass plate 3 and the core at the same time. The surface of the glass plate 3 is cooled mainly while heating the core of the glass, maintaining the temperature of the core, and forming a temperature difference from the core to the surface. It is required to turn on the heater 7 before the glass plate is quenched, so that the glass plate 3 can be heated to a desired temperature to achieve the required efficiency. Among them, the heater 7 is heated by microwaves, and the wind pressure is set to a rated wind pressure of 95%.

(4) Slow cooling treatment: After the step (3), the glass sheet is conveyed to the slow cooling zone 6 by the conveying mechanism 2, and further cooled to achieve the effect of being able to touch the glass piece.

(5) The lower part of the glass plate.

The thin tempered glass obtained in this example has a particle size of 60 particles in a 50 mm × 50 mm square.

Example 3

A thin tempered glass production method comprises the following steps: (1) heat treatment: horizontally placing the glass plate 3 on the conveying mechanism 2, and conveying the glass plate 3 to the heating furnace 1 through the conveying mechanism 2 for tempering heating, heating temperature 720 ° C, wherein the specification of the glass plate 3 is length × width = 600 mm × 400 mm, glass plate thickness D = 3 mm, glass plate heating time t = 90 s;

(2) Temperature compensation treatment at the conveying mechanism outside the furnace: the heat-treated glass plate 3 is sent out to the heating furnace through the conveying mechanism 2, the glass plate 3 is discharged at a speed of 1000 mm/s, and enters the transition conveying mechanism 10, and the transition conveying mechanism 10 is installed. A plurality of heaters 7 are mainly heated simultaneously for the surface of the glass plate and the core, and the heating temperature is 650 ° C to maintain the surface of the glass plate and the temperature of the core.

(3) Quenching: After the transition conveying mechanism 10, the glass plate 3 is transported by the conveying mechanism 2 into the cooling louver 5, and the cooling louver 5 has a high wind pressure, and the surface of the glass plate 3 can be rapidly cooled while being arranged in the area. A plurality of heaters 7 are mainly heated simultaneously for the surface and the core of the glass plate 3. The glass surface is cooled while mainly heating the glass core, maintaining the temperature of the core, and forming a temperature difference from the core to the surface. It is required to open the heater in advance when the glass sheet enters the area so that the glass sheet 3 can reach the required efficiency when entering the area. Among them, the heater 7 is heated by microwaves, the fan power of the cooling grille 5 is 315 kW, and the wind pressure is set to a rated wind pressure of 95%.

(4) slow cooling treatment: after the step (3) quenching process, the glass plate is slowly cooled until the glass plate reaches a local touch effect;

(5) The lower part of the glass plate.

The thin tempered glass obtained in this example has a particle size of 62 particles in a 50 mm × 50 mm square.

Comparative example 1

The specifications of the glass plate are length×width=600mm×400mm, the thickness of the glass plate is 2.5mm, the heating time of the glass plate is 120s, the heating temperature in the heating furnace is 700°C, the discharging speed is 450mm/S, and the wind pressure is set to 75%. Wind pressure.

Comparing the parameters such as particle size, stress and flatness of the thin glass plate when opening and not opening the heater of the present invention:

Open the heater: the particle size in the 50mm × 50mm box is 15 pieces, the stress is 123MPa, and the flatness of the edge of the thin glass plate is less than or equal to 0.25.

Do not turn on the heater: the particle size in the 50mm × 50mm box is 5, the stress is 110MPa, and the flatness of the edge of the thin glass plate is less than or equal to 0.25.

Comparative example 2

The specifications of the glass plate are length×width=600mm×400mm, the thickness of the glass plate is 2.5mm, the heating time of the glass plate is 120s, the heating temperature in the heating furnace is 700°C, the tapping speed is 600mm/S, and the wind pressure is set to 75%. Wind pressure.

The heater is turned on: the stress is 115 MPa, and the flatness of the edge of the thin glass plate is 0.3 or less.

The heater is not turned on: the stress is 96 MPa, and the flatness of the edge of the thin glass plate is 0.3 or less.

Claims

A method for producing a thin tempered glass, comprising the steps of:

(1) conveying the glass plate to the heating furnace through the conveying mechanism for heating;

(2) sending the heat-treated glass plate to the heating furnace through the conveying mechanism, and feeding it into the cooling louver for quenching; wherein the cooling louver is provided with a plurality of heaters, while the glass plate is rapidly cooled, The heater simultaneously heats the surface of the glass plate and the core to form a temperature gradient from the surface of the glass plate to the core;

(3) After completing the step (2), the glass plate is slowly cooled after the quenching process;

(4) After completing the step (3), the glass plate is placed under the slow cooling process.
A method for producing thin tempered glass, characterized in that the conveying mechanism is a roller conveyor mechanism or an air flotation conveying mechanism.
The method for producing a thin tempered glass according to claim 1, wherein the cooling louver outputs a cooling air to the surface of the glass plate by using a cast volute fan.
A method for producing thin tempered glass according to claim 1, wherein the cooling louver comprises an upper louver and a lower louver, and both the upper louver and the lower louver comprise at least one louver assembly, and the heater is disposed at the same louver Between adjacent windshield components.
The method for producing thin tempered glass according to claim 1, wherein in the step (2), the glass plate is turned on before the quenching, so that the heating power of the heater can be reached when the glass plate is quenched. The efficiency required.
A method for producing thin tempered glass according to claim 1, wherein a transition heating section is further disposed between the heating furnace and the cooling louver, and the transition heating section includes a transition conveying mechanism and simultaneously the surface of the glass sheet and the core portion Heated heater.
The method for producing a thin tempered glass according to claim 6, wherein the heating temperature of the transition heating section is 630 to 650 °C.
A method of producing a thin tempered glass according to any one of claims 1, 4, 5 or 6, wherein the heater is an infrared heater or a microwave heater.
A method of producing a thin tempered glass according to claim 7, wherein the heater is an infrared heater having a wavelength of 1000 to 5000 nm.