TW201332915A - Heat treatment method and equipment for heat-strengthened glass plate - Google Patents

Abstract

Disclosed are a heat treatment method and equipment for a heat-strengthened glass plate. When the heat strengthening treatment is carried out, a cooling section is divided into a heat strengthening area and a cooling area which are supplied with air independently by different air sources. The heat strengthening area reaches the heat strengthening pressure before the load of the glass plate comes, then all the load of the glass plate first passes through the heat strengthening area continuously without stopping or doing reciprocating motion, and the air source corresponding to the heat strengthening area applies air flow to the glass plate in the heat strengthening area with the heat strengthening pressure to carry out heat strengthening. After all the load of the glass plate in the heat strengthening area is conveyed to the cooling area and reaches the required temperature range, the air source corresponding to the cooling area applies air flow to the glass plate in the cooling area with the cooling pressure until the load of the glass plate reaches the final treatment temperature. The heat-strengthened glass plate can obtain the required surface stress, can be modified and controlled and has higher quality.

Description

Heat treatment method of heat-strengthened glass plate and heat treatment equipment thereof

The present invention relates to a method and apparatus for glass processing, and more particularly to a heat treatment method and a heat treatment apparatus for thermally strengthening a glass using a tempering furnace.

In the heat treatment process of the heat-strengthened glass sheet, the tempering treatment is generally first performed by a tempering furnace, and the glass load is transferred by the roller in the tempering furnace according to the required heating time. The glass plate will be heated to about 630 ~ 650 ° C, depending on the type of glass plate raw materials, quality and thickness, there will be some differences in temperature.

After the tempering process is completed, the glass sheet needs to be transferred to another processing unit for further heat treatment, also referred to as a cooling section or chiller. According to different heat treatment process processes, tempered glass sheets and heat strengthened glass sheets are respectively obtained.

Taking the cooling section by name as an example, referring to Fig. 1, the equipment of the heat-strengthened glass plate is the upper stage 1, the tempering furnace 2, the cooling section 3 and the lower stage 4, and the upper stage 1 and the lower stage 4 are respectively carried. There are rollers 5 for carrying and conveying the glass load 13.

Glass Load 13: Refers to all glass sheets in a batch, which may include one or more glass sheets, all of which are heavily weighted. When using "all glass load", it is for emphasis.

Glass plate (not shown separately): refers to one or more glass plates, which are biased towards the glass plate itself.

It is mainly used when describing the heat treatment process.

Glass: Used when making general descriptions. Such as: thick glass, coated glass and so on.

In the cooling section 3, a plurality of rollers (glass-loading rollers, not shown) for carrying the glass sheets are also provided, and an air blowing system for conveying airflow to the glass is additionally provided, and the air blowing system includes a gas source 7, gas. The source 7 is connected to the air distribution box 6 through the air passage, and a plurality of wind boxes 15 are respectively led out from the air distribution box 6 through the air duct to the upper and lower sides of the glass plate, and the wind box 15 has a plurality of nozzles on one side of the glass plate. The air blowing system applies airflow to the upper and lower surfaces of the glass sheet through the nozzles of the bellows 15. Therefore, the air pressure and velocity blown onto the surface of the hot glass control the temperature and cooling rate of the hot glass, as well as the corresponding internal and surface stresses.

In the cooling section 3, the manner in which the gas flow acts on the glass load 13 has a large effect on the performance of the product. Referring to Figure 2, an air conditioning device for a glass cooling section is disclosed as an improvement in US 6,279,350, the blasting system comprising a gas source (fan, not shown), the air source is connected to the air distribution box 6 through the air passage, and a plurality of wind boxes 15 are respectively taken from the air distribution box 6 to the upper and lower sides of the glass plate, and the bellows 15 is utilized. The nozzle toward the glass plate blows airflow to the glass plate, and the air distribution box 6 is provided with the air switch 14. When the air switch 14 is opened, the entire air distribution box 6 is an integral communication structure, but the air flow pressure is relatively low at this time. When the pressure needs to be increased during the processing of the glass plate, the glass plate is transferred to the left side of the figure and When the air switch 14 is closed, the air pressure of the left air box will be significantly increased to meet the process requirements. Therefore, the purpose of this equipment is not to heat-strengthen the glass, but to temper the thin glass of 2.8~3.8 mm thick in order to increase the wind pressure of the fan. However, the disadvantage of this approach is that the power of the fan as a gas source is very large and requires a lot of electric energy.

In connection with the apparatus of Figure 1, the prior art process for a typical heat strengthened glass sheet is such that after the glass load 13 reaches the desired temperature in the tempering furnace 2, it is delivered to the cooling section 3. The glass sheet will reciprocate throughout the cooling section 3 and will be subjected to a flow of gas that changes in pressure over time until the desired lower sheet temperature is reached. If there is a post-cooling section, then after the glass sheet is thermally strengthened in the cooling section 3, it will be transferred to the post-cooling section for final cooling. A disadvantage of this treatment method is that the front and rear portions of the glass load 13 are subjected to different heat treatments, and this different heat treatment causes a change in surface stress and flatness at both ends of the glass load 13.

Please refer to Figures 3 to 5, which are respectively three conventional heat-strengthening treatment methods (represented by the relationship between the heat-strengthening time and the pressure of the gas flow applied to the glass plate).

Referring to Figure 3, in the first heat-strengthening treatment method, the different heat strengthening times and the corresponding gas flow pressures are as follows:

In the first heat-strengthening treatment method, the flatness of the glass sheet is difficult to control, the front portion and the rear portion of the glass load 13 are greatly different, and the larger the glass sheet, the greater the difference in bending between the front portion and the rear portion of the glass load 13 .

Referring to Figure 4, in the second heat-strengthening treatment method, the different heat-strengthening times and the corresponding airflow pressures are as follows:

In the second heat-strengthening treatment method, the flatness of the glass sheet is still difficult to control, the front portion and the rear portion of the glass load 13 are greatly different, and the larger the glass sheet, the more the difference in bending between the front portion and the rear portion of the glass load 13 Big.

Referring to FIG. 5, in the third heat strengthening treatment method, different heat strengthening times and corresponding air flow pressures are as follows:

The third heat-strengthening treatment method is especially suitable for heat-strengthened low-emission (Low-E) products, but the surface stress value of the glass plate is difficult to precisely control, because at low pressure ranges, the pressure is not as accurate as high pressure. Ground control. In addition, it is difficult to produce surface stresses and fracture forms that are acceptable for thicker heat-strengthened glass sheets from 8 to 12 mm. The entire processing cycle is much longer than any other.

In summary, the heat-strengthening process is similar to the tempering process. Before the quenching or cooling process, the glass plate to be thermally strengthened needs to be heated to a temperature higher than the transformation temperature (up to about 630 ° C). Quenching or cooling treatment will cause compressive stress on the surface of the glass sheet.

The compressive stress values on the surface or edge of the heat-strengthened glass sheet will vary depending on the application and the standards used. Of course, the crack characteristics of the heat-strengthened glass sheet mainly depend on the compressive stress value, and are very similar to the low-stress tempered glass sheet. However, the limitation is that when the surface stress value of the tempered glass sheet is lower than 30 MPa, the crack does not stop expanding at the edge of the glass sheet, and when it is higher than 65 MPa, a lot of fragments are generated after the crushing. Therefore, the heat-strengthened glass sheet can increase the crushing strength by increasing the compressive stress value. Thus, the crack characteristics can be controlled by controlling the value of the compressive stress on the surface of the glass sheet, which minimizes the possibility of falling, because the fragments are still within the window frame when the glass sheet is suddenly broken.

Therefore, the crack characteristics and the breaking strength are related to the surface compressive stress and the central tensile stress of the glass sheet, and the compressive stress and the tensile stress depend on the speed at which heat is transferred from the surface of the glass sheet.

This will result in changes in process control, cooling capacity and overall temperature differences of the thermally strengthened glass sheet. Large airflow velocities will result in large temperature gradients. When natural convection is used instead of forced convection, that is, when the pressure value is set to zero (0) Pa (Pa), the cooling rate and airflow can be minimized.

Reasonable control of the heat transfer effect, namely the surface compressive stress and the internal tensile stress of the glass sheet, can improve the controllability of obtaining the desired crack characteristics.

Compared with the conventional method, the present invention provides a method for accurately controlling surface stress and surface flatness, and the method is particularly suitable for thick glass, such as heat-strengthened white glass of 10 to 12 mm thick, and suitable for 8~10. Low Emissivity (Low Emissivity, Low-E) coated glass. Thermally strengthened glass sheets are very difficult to control using conventional methods, but precise control can be achieved using the method of the present invention.

For thick glass, it is possible to achieve consistent surface stress and precise control at a low surface stress range of 30 to 50 MPa with an accuracy of 1 Mpa (which can be adjusted according to the application), and for each of all glass loads The glass plate can be precisely processed in the same way. Also for different glass sheets, the present invention also provides an improved flatness control method in which both ends of the glass sheet will react the same, depending only on the adjustment or setting of the air balance.

Moreover, the present invention can save about 10% of the time for the entire cooling section, which means that the invention not only has higher throughput, better and more precise control, but also consumes less energy.

The invention provides a heat treatment method for a heat-strengthened glass sheet, which comprises transferring a glass load, which may be heated by a tempering furnace, which may include one or more glass sheets, to a cooling section which can be subjected to tempering treatment or heat strengthening treatment, when performing heat strengthening During processing, the cooling section is divided into at least one heat-enhanced zone and at least one cooling zone, and the heat-strengthening zone and the cooling zone are independently supplied by different gas sources. The heat-strengthening zone has reached the heat-strengthening pressure before the glass load arrives. All the glass loads first pass through the heat-strengthening zone continuously without stopping or reciprocating, and the gas source corresponding to the heat-strengthening zone is directed to the glass in the heat-strengthening zone. The plate is subjected to a heat-enhanced pressure to apply a gas flow for heat strengthening. After all of the glass load in the heat-enhanced region is delivered to the cooling zone and reaches a predetermined temperature range, the gas source corresponding to the cooling zone applies a gas flow to the glass plate in the cooling zone at a cooling pressure until the glass load reaches the final processing temperature.

The heat strengthening pressure can be set according to the thickness of the glass plate and the required surface stress value. The preferred heat strengthening pressure is 50 to 1000 Pa.

The cooling pressure can be set according to the performance of the gas source, preferably 750 to 5000 Pa.

Unless otherwise stated, the pressure values described throughout the present invention are relative pressures, i.e., portions above a standard atmospheric pressure.

Preferably, before the entire glass load passes through the entire heat-enhanced region and is transmitted to the rear end (output end) of the cooling region, the gas source corresponding to the cooling region does not apply air flow to the glass load, and the temperature of the glass plate is still relatively high. High, about 520~600 °C (depending on the thickness of the glass), from the glass load to the back end to the temperature reaches 320~450 °C, the air source in the cooling zone does not apply air flow to the glass load, or apply the minimum amount of airflow or output a small amount. airflow.

No air flow is output or applied: it can be achieved by cutting off the power supply of the air source. The power supply can be switched off directly or switched off by a control signal.

The minimum airflow refers to: when the air source is a fan, the airflow of the fan is closed, and the airflow is obtained when operating at the lowest speed; when the air source is compressed air, the valve is closed, and the compressor The air flow obtained when operating at the lowest speed.

Output a small amount of airflow: When considering the balance of production and application requirements, because the application requirements may vary, it is possible to select an operating mode that outputs a small amount of airflow to meet the application requirements to increase production.

When there are a plurality of heat-enhanced areas or cooling areas, it should be understood that the glass plates pass through all the heat-enhanced areas in turn (all the heat-enhanced areas participating in the heat-enhanced treatment), and then pass through all the cooling areas in turn (all cooling areas participating in the cooling process) ).

The glass sheet continuously passes through the heat-strengthening region in a manner that does not stay or reciprocate, and as a preferred mode, the entire glass load passes through the heat-reinforced region at a constant speed. The conventional technique is that the glass plate is subjected to a gas flow in a reciprocating state to complete heat strengthening and cooling.

When the cooling zone does not output a gas flow or outputs a minimum amount of gas flow or outputs a small amount of gas flow, the glass plate may be in a stationary state or a reciprocating state in the cooling zone.

The invention further provides a heat treatment apparatus for a heat-strengthened glass sheet, comprising at least one tempering furnace and at least one cooling section, the cooling section comprising at least one heat-strengthening zone and at least one cooling zone, the heat-strengthening zone and the cooling zone being independent of different gas sources Gas supply, the total rated power or total actual power consumption of the gas source in all heat-enhanced areas is 1% to 30% of the rated total power or total actual power consumption of the gas source in all cooling zones.

For the gas source of the heat-enhanced region, the actual power consumption is the power consumed to maintain the heat-enhancement pressure, and does not consider the power in other states such as standby.

For the gas source of the cooling zone, the actual power consumption is the power consumed to maintain the cooling pressure, and does not consider the power in other states such as standby.

The total rated power of the gas source in the heat-enhanced region should satisfy the ratio range of 1% to 30% regardless of the rated total power or total actual power consumption of the gas source in the cooling zone.

The total actual power consumption of the gas source in the heat-enhanced region should satisfy the ratio range of 1% to 30% regardless of the rated total power or the total actual power consumption of the gas source in the cooling region.

As a preferred mode, the total rated power or total actual power consumption of the air source in all thermally enhanced regions is between 5 and 40 KW. Due to the improved process, the total power rating of the gas source in all of the thermally enhanced regions of the present invention can be relatively reduced to reduce power consumption.

The heat-strengthening zone and the cooling zone are merely used to distinguish the naming of the two, and are not limited to the gas supply mode or process.

When there are a plurality of heat-enhanced regions and cooling regions, the heat-strengthening regions are arranged in sequence along the traveling direction of the glass load, and the cooling regions are arranged in order, that is, in addition to the transition regions, the heat-enhanced regions are adjacent to the heat-strengthening regions, and the cooling is performed. Area adjacent cooling area. The heat-strengthening zone and the cooling zone are adjacent only in the transition zone and not separately.

In the prior art, the cooling section generally has a plurality of rollers for carrying the glass sheet and an air blowing system for conveying the airflow to the glass. The air blowing system includes a gas source, and the air source is connected to the air distribution box through the air passage. In the air distribution box, a plurality of bellows are respectively led to the upper and lower sides of the roller through the air duct. The present invention divides the cooling section into different regions, and each of the heat-enhanced regions and each of the cooling regions is distributed The glass carrying rolls in the respective areas and the bellows for conveying the air flow to the glass sheets, the various areas are improved over conventional arrangements in the arrangement of the gas source and the air distribution box.

As an embodiment, each of the heat-enhanced regions and each of the cooling zones has a relatively independent air source, air distribution box, and bellows. The gas source, the air distribution box and the bellows corresponding to a certain area are sequentially connected.

In all the heat-enhanced areas, a part of the heat-enhanced areas may share the same gas source and the air distribution box (the gas source and the air distribution box are connected by the air path), and the shared air distribution box separately points to the heat-enhanced area. The bellows is led out, and each of the remaining heat-enhanced areas has a relatively independent air source, air distribution box and bellows.

In all the cooling areas, a part of the cooling area may share the same air source and the air distribution box (the air source and the air distribution box are connected by the air path), and the shared air distribution box respectively leads the bellows to the part of the cooling area. And each of the remaining cooling zones has a relatively independent air source, air distribution box and bellows.

In another embodiment, at least a part of the heat-enhanced area and at least a part of the cooling area share the same air distribution box, and the air distribution box is divided into an air distribution area corresponding to the heat-enhanced area and the cooling area by the air switch, and The gas source and the bellows corresponding to the heat-enhanced area and the cooling area are respectively connected to the corresponding air distribution areas. The air source corresponding to the heat-enhanced area and the cooling area also shares the same air distribution box. Preferably, all of the heat strengthened zones and all of the cooling zones share the same air distribution box.

The air distribution zone (not shown) means that when the air distribution box is divided into sections by the air duct switch, each section is called an air distribution zone. The size of the air distribution zone varies depending on whether the air switch is turned on or off.

In the entire cooling section, since a plurality of zones (heat-enhanced zone or cooling zone) share the same air distribution box, it is necessary to divide the air distribution box by the airway switch, and air distribution on both sides of the airway switch when the airway switch is closed. The zones are isolated from each other, and each air distribution zone can use a corresponding gas source to deliver a gas flow to a corresponding zone (heat-enhanced zone or cooling zone) to ensure that the heat-strength zone and the cooling zone do not affect each other. This operation is generally used when the glass plate is thermally strengthened. When the air switch is opened, the air distribution areas on both sides of the air switch are connected to each other. At this time, the air source of the cooling section can be utilized to all the connected air distribution areas. And the area (heat-enhanced area and cooling area) delivers airflow. A common operation is to connect all air distribution zones and areas in the cooling section. This operation is generally used for tempering glass sheets and also for common heat-strengthening processes.

The gas source is a centrifugal fan, an axial fan or compressed air. When the air source is compressed air, the total rated power or the total actual power consumption of the air source may be regarded as the total rated power or the total actual power consumption of the air compressor, or may be correspondingly converted into compressed air under the same conditions. Output capability (such as maximum output per unit time).

The most important between the heat-enhanced region and the cooling region described in the present invention is that it can be independently controlled during airflow transportation without affecting each other, and each gas source can be separately disposed in a spatial position, for example, a gas source for heat strengthening can be Located above the heat-enhanced area or above the tempering furnace.

Preferably, in order to facilitate the independent control of the respective air distribution zones, among the air sources sharing the same air distribution box, at least N-1 air sources and the corresponding air distribution zones are provided with a sub airway switch, N is the number of air sources sharing the same air distribution box. Of course, it may also be a gas source sharing the same air distribution box, and a sub air switch is provided between all the air sources and the corresponding air distribution area. Preferably, a sub-wind switch is disposed between the air source corresponding to the heat-enhanced region and the corresponding air distribution region, so that when the cooling region is working, the airflow is prevented from being retrograde from the air distribution box to correspond to the heat-enhanced region. The source of gas.

The air switch and the sub air switch can be very simple mechanical structures, such as a simple butterfly valve-like flap to control the flow direction of air in the air distribution box. The flaps are driven by electric or pneumatic drive components for automatic opening and closing. For example, a cylinder can be used to drive the shaft of the flap.

In the heat treatment method of the heat-strengthened glass plate of the present invention and the heat treatment device thereof, the cooling section is divided into at least two regions, each of which is provided with an independent gas source, so each region can adopt different process parameters to obtain the most A glass plate that is excellent in performance and meets the quality requirements of any particular heat-reinforced product. For thick glass, it is possible to achieve consistent surface stress and precise control at a low surface stress range of 30 to 50 MPa with an accuracy of 1 Mpa (which can be adjusted according to the application), and for each of all glass loads The glass plate can be precisely processed in the same way. Also for different glass sheets, the present invention also provides an improved flatness control method in which both ends of the glass sheet will react the same, depending only on the adjustment or setting of the air balance.

Referring to FIG. 6 and FIG. 7 , a glass plate heat treatment apparatus of the present invention comprises, in order, an upper stage 1, a tempering furnace 2, a cooling section 3 and a lower stage 4, and the upper stage 1 and the lower stage 4 are both There are rollers 5 for carrying and conveying the glass load 13.

The cooling section 3 is provided with a plurality of glass carrying rollers (not shown), and the cooling section 3 is divided into two regions, a heat-enhancing region 17 and a cooling region 16, respectively, which share the same air distribution box 6, which The air distribution box 6 is divided by the air path switch into two air distribution areas corresponding to the two areas.

The air duct switch in the air distribution box 6 is constituted by a rotating shaft 9 and a flap 8 which is rotatably fitted therewith, and the flap 8 can be automatically controlled by the cylinder.

The air distribution area corresponding to the heat-enhanced area 17 is provided with an independent air source, that is, the fan 10, and the rated power is 30 Kw, and a sub-wind switch is arranged between the fan 10 and the corresponding air distribution area, and the sub-wind switch is composed of The rotating shaft 11 is constituted by a flap 12 which is rotatably fitted thereto, and the flap 12 can be automatically controlled by a cylinder.

The air distribution zone corresponding to the cooling zone 16 is provided with an independent air source, that is, the fan 7, with a rated power of 300 Kw, and the two air distribution zones can be respectively transported to the heat-enhanced zone 17 and the cooling zone 16 by the respective bellows 15 airflow.

When the glass sheet is subjected to a tempering process, the flap 8 is opened to connect the two air distribution areas, and the flap 12 is closed to isolate the fan 10. When the glass sheet is transported into the cooling section 3, only the fan 7 is used. The air distribution box 6 simultaneously delivers airflow to the heat-enhanced region 17 and the cooling region 16, and the heat-enhanced region 17 and the cooling region 16 at this time employ the same process.

When the glass sheet is heat-strengthened according to the method of the present invention, the flap 8 is closed to isolate the two air distribution zones, and the flap 12 is opened. At this time, the fan 10 and the fan 7 can be separately heated to each other without interference. The reinforced zone 17 and the cooling zone 16 deliver airflow.

In a specific implementation, the tempered glass load 13 is first transported into the cooling section 3, and all the glass loads 13 are continuously passed through the heat-enhanced region 17 in a manner that does not stay or reciprocate, and the heat-enhanced region 17 is passed through the blower 10 Air flow is applied to the glass plate for thermal strengthening. Please refer to Fig. 8. This process is equivalent to the time period T0 in the figure. The time period T0 is usually between 3 and 9 seconds. Of course, it is necessary to consider the transmission speed of the glass load 13 and the length of the heat-enhanced region (along the glass load 13) In the conveying direction), the time period T0 can only be changed by setting the conveying speed, and the relatively short injection time and high pressure of the air flow can perform more precise surface pressure and crushing form control.

In the period T0, the heat strengthening pressure P0 can be set according to the thickness of the glass sheet and the required surface stress value. The actual power consumption of the fan 10 generally refers to the power consumed during this time period to maintain the heat enhancement pressure P0.

Since the glass load 13 continuously passes through the heat-enhanced region 17 in a manner that does not stay or reciprocate, the glass load 13 passes through the heat-enhanced region 17 and is transported to the cooling region 16. Before all of the glass load 13 passes through the entire heat-enhanced region 17 and is transferred to the rear end (output end) of the cooling zone 16, the fan 7 corresponding to the cooling zone 16 does not apply airflow to the glass load 13, from the glass load 13 to the rear end until the temperature reaches At 320 to 450 ° C, the fan 7 of the cooling zone 16 does not apply a gas flow to the glass load 13 and a minimum amount of gas flow can be applied. After the temperature reaches 450-320 ° C, the fan 7 is used to apply a cooling pressure to the glass load 13 . The glass load 13 may be in a stationary or reciprocating state when in the cooling zone 16. The corresponding P1 is usually set to 0 Pa, that is, when heat is transferred from the inside to the surface of the glass, heat transfer and cooling are performed only by natural convection.

When the process of applying a low to high air flow to the glass load 13 by the blower 7 in the cooling zone 16 is used, the processing time (T2~T5) and the change of the airflow pressure applied to the glass plate can be seen in the following table:

The actual power consumption of the fan 7 corresponding to the cooling zone 16 generally refers to the power consumed to maintain the cooling pressure P4 during the time period T4.

The heat treatment method of the present invention can achieve uniform surface stress and precise control in a low surface stress range of 30 to 50 MPa (adjustable according to application requirements) with a precision of 1 Mpa, and for all glasses. Each glass plate in the load can be precisely processed in the same way. Also for different glass sheets, the present invention also provides an improved flatness control method in which both ends of the glass sheet will react the same, depending only on the adjustment or setting of the air balance.

Moreover, the present invention can save about 10% of the time for the entire cooling section, which means that the invention not only has higher throughput, better and more precise control, but also consumes less energy.

Referring to Figure 13, the heat-strengthened glass sheet produced by the present invention, when the crushing impact is applied to the middle of the long side of the glass sheet, the two cracks will reach the opposite edge, and the other two cracks will reach the two short sides respectively. The edge of the word (meaning that it is 5 pieces, the Chinese national standard GB/T 17841-2008 reflects the specific meaning of the fragment, the invention cites this meaning. In the PCT international application or direct application to other regions, the international standard EN1836 will be cited The specific meaning of the fragments reflected in the -1-2000 standard) is that the fracture form of such heat-strengthened glass sheets is optimal. In order to achieve the above-described crushing form, the glass sheet must be uniformly heated to the same temperature above 630 ° C to become a tempered glass sheet. Otherwise, temperature differences can make it difficult to control the fracture characteristics. The fracture feature refers to the number of fragments and the way the cracks propagate.

In contrast, in Fig. 14, the heat-strengthened glass sheet having a higher surface pressure is broken in the form of a crack after hitting the middle of the long side, and the effect is not satisfactory.

Comparative example

Referring to FIG. 9 and FIG. 10, the cooling section in the figure is also divided into a heat-enhanced area 17 and a cooling area 16, but the two areas are the common fan 18, and only the air distribution switch 21 is used to divide the air distribution box 6 into In the two air distribution areas, the fan 18 is respectively connected to the two air distribution areas of the air distribution box 6 by two parallel branches, and the air flow switch 20 is arranged between the air distribution area corresponding to the cooling area 16 and the fan 18. The air path switch 22 and the air path switch 23 connected in series are provided on the branch 19 between the air distribution area corresponding to the heat-enhanced area 17 and the fan 18.

With the state change of each airway switch, it is possible to individually control the conveying airflow to the heat-enhanced region 17, or to connect the entire air distribution box 6 to achieve heat-strengthening treatment of the glass sheet, but due to the heat-enhanced region 17 and the cooling region 16 It is not the use of independent gas sources, so it is difficult to control when performing pressure conversion. It has waiting time for waiting for pressure stability and reduces efficiency. Moreover, the rated power of the fan that can be used for both tempering and heat strengthening is relatively large. For example, 160~450 KW, it is difficult to use such a high power fan to obtain very low heat strengthening pressure. Refer to and compare Figure 11 and Figure 12 (T indicates the production cycle of a batch, the time period T0~T4 in the figure, and the corresponding airflow pressures P0~P4). When the present invention utilizes independent air source control, The pressure of the airflow applied to the glass load is easy to control, and the pressure can be switched in time between different cycles during continuous production.

By comparing the two figures, it can be seen that in the comparative example, when the pressure needs to be changed from a relatively high cooling pressure to a relatively low heat strengthening pressure during the cycle connection, a certain pressure adjustment and stabilization time are required (corresponding to the time period) The change in gas flow pressure can be referred to the section Padj in Figure 11 to reach the predetermined pressure before the next batch of glass load can be thermally strengthened.

1. . . Upper stage

2. . . Tempering furnace

3. . . Cooling section

4. . . Lower stage

5. . . Roller

6. . . Air distribution box

7. . . Fan

8. . . Flap

9. . . Rotating shaft

10. . . Fan

11. . . Rotating shaft

12. . . Flap

13. . . Glass load

15. . . Bellows

16. . . Cooling area

17. . . Heat strengthened area

18. . . Utility fan

19. . . Branch road

20, 21, 22, 23. . . Wind switch

P0~P4. . . pressure

Padj. . . Section

T, T0~T4. . . period

Fig. 1 is a schematic view showing the structure of a glass plate heat-strengthening treatment apparatus in the prior art.
Figure 2 is a schematic diagram of the internal structure in another cooling section of the prior art (only the air flow conveying and distributing equipment is illustrated).
Fig. 3 is a schematic view showing changes in the heat strengthening time and the pressure of the gas flow applied to the glass plate in the first embodiment of the prior art.
Fig. 4 is a schematic view showing changes in the heat strengthening time of the second embodiment of the prior art and the pressure of the gas flow applied to the glass sheet.
Fig. 5 is a schematic view showing changes in the heat strengthening time of the third embodiment of the prior art and the pressure of the gas flow applied to the glass sheet.
Fig. 6 is a schematic view of the heat treatment apparatus of the present invention, in which only the airflow conveying and distributing equipment is illustrated in the cooling section, and the state corresponding to the two airway switches is a tempering process.
Fig. 7 is a schematic view showing the state in which the two air passage switches correspond to the heat strengthening treatment process in the cooling section in Fig. 6.
Fig. 8 is a schematic view showing changes in the treatment time and the pressure of the gas flow applied to the glass sheet in the heat-strengthening treatment in the cooling section in the process of the present invention.
Figure 9 is a schematic diagram of the internal structure of the cooling section in the comparative example (only the airflow conveying and distribution equipment is illustrated);
Figure 10 is a schematic view showing the structure of each air passage switch in Fig. 9 in another working state.
Fig. 11 is a graph showing changes in the treatment time and the pressure of the gas flow applied to the glass sheet in the case of continuous heat strengthening treatment in the comparative example.
Fig. 12 is a view showing the change of the treatment time and the pressure of the gas flow applied to the glass sheet in the continuous heat strengthening treatment of the present invention.
Fig. 13 is a schematic view showing the form of the fracture after the heat-strengthened glass sheet produced by the present invention is struck by the middle of the long side.
Figure 14 is a schematic representation of a fragmented form of a heat strengthened glass sheet with a higher surface pressure after striking the middle of the long side.

1. . . Upper stage

2. . . Tempering furnace

3. . . Cooling section

4. . . Lower stage

5. . . Roller

6. . . Air distribution box

7. . . Fan

8. . . Flap

9. . . Rotating shaft

10. . . Fan

11. . . Rotating shaft

12. . . Flap

13. . . Glass load

15. . . Bellows

16. . . Cooling area

17. . . Heat strengthened area

Claims (10)

A heat treatment method for a heat-strengthened glass sheet, comprising: transferring a glass load including at least one glass plate after being heated by a tempering furnace to a cooling section capable of performing a tempering treatment or a heat strengthening treatment, wherein when performing heat strengthening treatment, The cooling section is divided into at least one heat-enhancing zone and at least one cooling zone, the at least one heat-enhancing zone and the at least one cooling zone are independently supplied by different gas sources, and the at least one heat-strengthening zone has reached before the glass load arrives The heat-strengthening pressure, the entire glass load is first continuously passed through the at least one heat-strengthening region in a manner of not staying or reciprocating, and the gas source corresponding to the at least one heat-strengthening region is directed to the glass plate in the at least one heat-strengthening region The heat-enhanced pressure applies a gas flow to be thermally strengthened. After all the glass loads in the at least one heat-enhanced region are delivered to the at least one cooling region and reach a predetermined temperature range, the gas source corresponding to the at least one cooling region is in the The glass plate of at least one cooling zone applies airflow at a cooling pressure until the glass load reaches the final Treatment temperature. The heat treatment method of the heat-strengthened glass sheet according to Item 1, wherein the predetermined temperature range is 320 to 450 °C. The heat treatment method of the heat-strengthened glass sheet of claim 1, wherein the at least one cooling area corresponds to before the entire glass load passes through the entire at least one heat-strengthening region and is transmitted to the rear end of the at least one cooling region. The gas source does not apply a gas flow to the glass load. When the glass load reaches the rear end to a temperature of 320 to 450 ° C, the gas source of the at least one cooling zone does not apply a gas flow to the glass load, or applies a minimum amount of gas flow. The method for heat-treating a heat-strengthened glass sheet according to claim 1, wherein when the at least one heat-strengthening region or the at least one cooling region is plural, the glass load sequentially passes through the plurality of heat-strengthening regions, and then A plurality of the cooling zones are sequentially passed through. The heat treatment method of the heat-strengthened glass sheet according to claim 1, wherein the glass is in a stationary state or a reciprocating state when the glass is loaded in the at least one cooling region. A heat treatment apparatus for a heat-strengthened glass sheet, comprising at least one tempering furnace and at least one cooling section, wherein the at least one cooling section comprises at least one heat strengthening zone and at least one cooling zone, the at least one heat strengthening zone and the at least one cooling zone The gas is independently supplied by different gas sources, and the total rated power or the total actual power consumption of the gas source of the at least one heat-enhanced region is 1% to 30 of the rated total power or the total actual power consumption of the gas source of the at least one cooling region. %. The heat-treating device of the heat-strengthened glass plate according to claim 6, wherein the total rated power or the total actual power consumption of the gas source of the at least one heat-strengthening region is between 5 and 40 KW. The heat treatment apparatus of the heat-strengthened glass sheet according to claim 6, wherein a part of the at least one heat-strengthening area and a part of the at least one cooling area share the same air distribution box, and the air is distributed by a wind switch Separating the box into an air distribution area corresponding to the at least one heat-enhanced area and the at least one cooling area, and the air source and the bellows corresponding to the at least one heat-enhanced area and the at least one cooling area respectively corresponding to the air distribution area Connected. The heat-treating apparatus of the heat-strengthened glass sheet of claim 8, wherein the at least one heat-strengthening zone and the at least one cooling zone share the same air distribution box. The heat-treating device for the heat-strengthened glass plate according to claim 6, wherein the gas source is a centrifugal fan, an axial fan or compressed air.