KR100937889B1 - Manufacturing Process of Tempered glass - Google Patents

Abstract

The present invention relates to a process for manufacturing tempered glass, comprising: a first step in which float glass enters an IN loading table for manufacturing tempered glass;

A second step of the heating table in which the float glass entering the IN loading table is heated by hot coils on the upper and lower surfaces while linearly reciprocating the heating furnace according to the reference temperature and time according to the thickness thereof; Wow; Float glass sufficiently heated in the heating table step is cooled while linearly reciprocating by the wind pressure and cooling time at room temperature set to adjust the particle size according to each thickness, and the degree of warpage of the finished glass Cooling table step of adjusting the gap between the upper and lower sides of the cooler to cool the float glass through the pressure of the wind in the upper and lower surfaces of the float glass in the cooling table according to each thickness to reduce Step 3; And a fourth step of an OUT loading table step in which tempered glass, which is a finished product, comes out through the cooling table step.

Tempered glass completed through the above process has a strength of about 1500kg / ㎠ and three times the strength of ordinary glass, tensile strength is about three times, and compressive strength is also about 1.5 times greater than ordinary glass. In addition, the impact strength (impact strength) that is practically used is about 1kgf / m on the basis of 5mm thickness of ordinary glass, 5.5kgf / m is about 5 times larger than tempered glass.

Tempered Glass, Manufacturing Process of Tempered Glass

Description

Manufacturing Process of Tempered Glass

The present invention relates to a manufacturing process of tempered glass, and more particularly, by adjusting and controlling the four-step process for producing tempered glass appropriately to reduce the defect of the tempered glass as a finished product and to improve the quality of the manufacturing process It is about.

In general, glass is broken because compressive stress acts on the glass surface and tensile stress acts on the glass surface on the other side when the external force is applied to the glass. If the compressive stress is applied to the glass surface on the opposite side as shown in Figure 4, since the force is formed to resist the tensile stress is difficult to break even when the impact is applied from the outside of the glass. Unlike ordinary glass, tempered glass has a high strength because compressive stress is formed on the glass surface.

Generally, the tempered glass is made by a heat treatment process in which float glass is heated and then rapidly cooled. With regard to a series of processes for cooling such float glass through heat treatment, in particular, the temperature standard according to the appropriate float glass thickness during the heat treatment process, and in the case that the tempered glass is broken, The wind pressure at the cooling stage, which determines the number of particles to be split per unit area (5 cm 2) to meet the specified quality standards, and the degree of warpage of the tempered glass when it exits the last stage. Regarding the gap of the cooler that cools through the wind of the upper and lower surfaces of the glass in the cooling stage to ensure accurate quality by adjusting, there is a problem of lack of standardization of the accurate value related to the manufacturing process of this series of tempered glass. have. In addition, the length of the conventional reinforcing furnace in the heat treatment process is short, it is difficult to transport the float glass (float glass) to the appropriate temperature according to each thickness in the heat treatment process, there is a similar problem in the cooling step.

In order to solve the above problems, in the present invention, the heat treatment temperature and time according to the thickness of the float glass in each process according to the manufacturing process of the four-step tempered glass of the tempered glass, the wind during cooling To improve the quality of tempered glass by standardizing values such as pressure and gap, and to ensure sufficient heating and cooling time through linear reciprocating motions in the heating table stage of the second stage and the cooling table stage of the third stage. Thus, the object of the present invention is to provide a tempered glass manufacturing process capable of improving the quality of tempered glass and minimizing its defect rate.

The manufacturing process of the tempered glass to achieve the object comprises the first step of entering the IN loading table float glass (float glass) for the production of tempered glass;

A second step of the heating table in which the float glass entering the IN loading table is heated by hot coils on the upper and lower surfaces while linearly reciprocating the heating furnace according to the reference temperature and time according to the thickness thereof; Wow; Float glass sufficiently heated in the heating table step is cooled while linearly reciprocating by the air pressure and cooling time at room temperature set to control the particle size according to each thickness, to reduce the degree of warping of the finished glass A third step of a cooling table for adjusting a gap of a cooler that cools the float glass through the pressure of the wind on the upper and lower surfaces of the float glass in the cooling table according to each thickness; ; And a fourth step of an OUT loading table step in which the finished tempered glass comes out through the third cooling step.

In another aspect of the present invention, the tempered glass according to the manufacturing process of the tempered glass is a third step after the high temperature heat treatment according to the thickness of each float glass in the heating table step of the second step It enters the cooling table stage and cools by the air pressure at room temperature on the upper and lower surfaces of the float glass. This results in compressive and tensile stresses on the surface and inside of the glass, respectively.

In other words, in the case where glass is to be broken on the glass surface, an artificial compressive stress which is the opposite of the force is generated to strengthen the glass. Normal glass is broken when the tensile stress is applied to the glass when the strength of the glass is less than the externally applied tensile stress. However, the tempered glass according to the above process is to produce a compressive stress permanently on the surface, and eventually the strengthening of the ordinary glass occurs by the force against the tension.

In manufacturing such tempered glass, the thickness of each float glass in the upper and lower surfaces through the linear reciprocation of the float glass in the heat treatment step of the heating table step in the above process When the appropriate heating time is exceeded, the float glass may be warped in the process step, and if it does not reach the heating time, it may not be heated enough. Cracks may occur due to cracking at the time of entry. In addition, if the proper pressure is not adjusted for the thickness of each float glass by the wind pressure in the cooling step, the float glass may be spontaneously damaged during cooling. In addition, the degree of warpage of the tempered glass that passes through the last step is determined by the upper and lower gaps of the cooler cooled by the wind at room temperature on the upper and lower surfaces of the float glass in the third step. By doing so, it is possible to produce tempered glass suitable for use.

After all, the common float glass (float glass) is to control the precise heat treatment and cooling step through the manufacturing process of the tempered glass according to the present invention, it is possible to produce a more stable and accurate quality tempered glass to be produced.

As described above, in the process of manufacturing tempered glass, the present invention includes a first step of entering through an IN loading table of float glass, a second step of heating table for heat treatment, and heat treatment. After the third step, which is a cooling table step for cooling the float glass, the finished product of tempered glass is passed through the OUT loading table. Float glass is a temperature and heating time in the heating table step is set according to the thickness of the float glass in each step in the above process, the wind pressure for cooling in the cooling table step, and cooling By controlling the time and the gap of the cooler, the particle size and the degree of warping of the finished tempered glass are controlled. In particular, in the second and third stages, sufficient heating time and cooling time can be secured through the linear reciprocating motion of the float glass.

The tempered glass completed through this process has a strength of about 1500kg / cm 2, about three times that of ordinary glass, about 3 times higher than normal glass, and about 1.5 times higher than compressive strength. In addition, the impact strength (impact strength) that is practically used is about 1kgf / m on the basis of 5mm thickness of ordinary glass, 5.5kgf / m is about 5 times larger than tempered glass.

1 is a flowchart of a tempered glass manufacturing process according to the present invention, Figure 2 shows the experimental data values of the necessary elements at each step according to the thickness of the float glass in the tempered glass manufacturing process according to the present invention Table.

FIG. 3 is a table showing standard setting values for the necessary elements in each step according to the thickness of the float glass in the tempered glass manufacturing process according to the present invention.

Preferred embodiments will be described based on the flow chart according to the manufacturing process of the tempered glass of the present invention shown above, the experimental table and the reference measurement values.

1 is a flow chart according to the manufacturing process of the tempered glass according to the present invention. The manufacturing process of the tempered glass of the present invention is made through a total of four steps, in processing the float glass in each step, the temperature and heating until the finished product of the last tempered glass through each process The quality of tempered glass differs depending on how the elements such as time, strength of wind pressure in the cooling stage, cooling time, and cooling and clearance of upper and lower coolers during cooling are different, and in some cases, glass in the process. May be broken.

First, float glass enters the IN loading table, which is the first step S10.

The entered float glass enters the heating table step of the second step S20 and heating is started. The heating temperature and heating time of the float glass in the second step (S20) is set differently according to the thickness of the float glass, as can be seen through the experimental data measured value in FIG. In the case of 5 mm thick glass, the glass is heated to 703 degrees Celsius at the top and 713 degrees Celsius at the bottom, and the float glass entered during the heating time for about 190 seconds is sufficiently heated by reciprocating motion in the front and back directions. do. In this case, if the heating time is not satisfied and the cooling table step of the third step (S30), which is a cooling step, is broken due to the crack phenomenon of the float glass, the time is exceeded. When heated, the manufacturing process of the tempered glass may not be properly performed due to the bending phenomenon of the float glass. Therefore, the process of the second step (S20) is set by setting the temperature and the heating time according to the thickness of each float glass in the heat treatment step by the table of the experimental data in FIG. It will be able to proceed smoothly.

After passing the heating table step of the second step (S20) to enter the cooling table step of the third step (S30). When the glass is cooled through uniformly cold air on the surface of the float glass after heating at a high temperature in the second step (S20), the float glass generates a rapidly decreasing force, in which case the glass As the thermal conductivity is lower than that of the metal, the cooling surface is gradually cooled without cooling. As shown in FIG. 4, the compressive stress is generated in the glass surface layer. As a result, the tensile stress is generated in the glass to form tempered glass.

In particular, in the third step (S30) for the progress of the cooling step to cool through the pressure of the wind at room temperature, the degree of density of the particles of the tempered glass as a finished product is determined according to the strength of the wind pressure and the cooling time. Since the bending degree of the tempered glass is adjusted according to the gap between the upper and lower coolers of the float glass, the tempered glass suitable for the use can be produced.

In particular, the setting according to each element of the cooling in the cooling table step of the third step (S30) is as shown in the experimental data of FIG. 2 when the air pressure cooled in the cooling table step is 4 KPa, the maximum wind pressure is 100% In the case of float glass thickness of 5mm, with 60% wind pressure and cooling time for 120 seconds, the density of subsequent tempered glass is about 40 at 5cm2. Particles are produced to produce tempered glass that meets quality standards. In addition, in relation to the gap between the float glass of the cooler due to the wind pressure of the upper and lower wind, by adjusting the clearance of 50mm for 5mm, 80mm for 8mm, 110mm for 10mm, 120mm for 12mm The final bending degree of the finished tempered glass is adjusted to match the quality of the tempered glass.

As described above, the appropriate values such as the heating temperature and heating time in the heating table stage of the float glass in each stage and the wind pressure and cooling time for cooling in the cooling table stage are standardized and finished. In the production of phosphorus tempered glass also reduces the defect rate, it is possible to produce products that meet the quality standards of tempered glass.

In particular, the setting elements such as the heating temperature and time in the second step (S20) and the third step (S30) and the wind strength and cooling time during cooling are as follows.

<Standard setting according to float glass thickness>

Glass thickness (mm) Washing water temperature (℃) Drying temperature (℃) Upper heating temperature (℃) Lower heating temperature (℃) Heating time (sec) Cooling wind pressure (%) Cooling time (sec) 4    20 ± 10    35 ± 15 690-710 700-720 145 ~ 165 50-95 70-105 5 690-715 700-720 170-195 50-95 105-135 6 690-715 700-720 210-230 50-95 155-185 8 685-705 700-720 295-315 40-65 240 ~ 285 10 685-705 700-720 375-405 30-60 330-370 12 680-700 685-710 470-495 15-45 410-450 15 660-680 665-685 670-690 5-20 610-630 19 645 ~ 665 680-700 800-1000 3 ~ 10 810-840

Therefore, when the glass thickness is 4mm as described above, the heating temperature at the time of heating is 690 ° C to 710 ° C in the upper part, the lower temperature is 700 ° C to 720 ° C, the heating time is 145 seconds to 165 seconds, and the wind pressure to be cooled is the maximum wind pressure. 50% to 95% of 4KPa of phosphorus and the cooling time is 70 to 105 seconds.

In the case of other 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, and 19mm, the tempered glass is obtained by going through the second step (S20) and the third step (S30) as the numerical values within each range as shown in the above table. Will be produced.

In addition, in the case of 5 mm, 8 mm, 10 mm, and 12 mm float glass, the measured values and the state of the tempered glass specifically measured through the second and third steps are as follows. Will come out.

<Experimental data values according to float glass thickness>

 Metric  Measurement result  Glass Types and Dimensions  5 mm transparent (395 × 595)  6 mm transparent (528 × 845)  8 mm transparent (600 × 1900)  10 mm transparent (968 × 2620)  12 mm transparent (600 × 1400) Washing water temperature (℃) 13 13 13 13 13 Drying temperature (℃) 42 42 42 42 42 Heating temperature (℃) Top 703 703 700 697 690 bottom 713 708 708 703 690 Heating time (sec) 190 228 312 400 485 wind pressure(%) 60 60 50 40 40 Cooling time (sec) 120 180 280 360 440 Glass Good Good Good Good Good

Therefore, if you look at the experimental data of each value in the process of manufacturing the glass of 5mm, 6mm, 8mm, 10mm, 12mm thickness of the tempered glass, it can be seen that the values are within the range of the set value already seen. Therefore, through the process of heating and cooling the float glass within this numerical range it is possible to minimize the defects and to produce a tempered glass of exactly the intended quality.

In addition, the gap between the upper and lower surfaces of the float glass in the cooling step of the third step (S30) is determined whether the warpage of the finished tempered glass after the bar, the numerical value of the gap The float glass thickness is 50mm for 5mm, 80mm for 8mm, 110mm for 10mm, and 120mm for 12mm. It is possible to prevent the defect caused by the bending phenomenon in advance.

Although the present invention has been described in connection with specific embodiments, those skilled in the art can make various modifications and changes without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can see it easily.

1 is a flow chart of the tempered glass manufacturing process according to the present invention.

2 is a table showing experimental data values of necessary elements in each step according to the thickness of float glass in the tempered glass manufacturing process according to the present invention.

3 is a table showing standard setting values for the necessary elements in each step according to the thickness of the float glass in the tempered glass manufacturing process according to the present invention.

Figure 4 is a schematic diagram showing a state in which the compressive stress and tensile stress inside and outside the tempered glass when the impact is applied to the tempered glass according to the manufacturing process of the tempered glass according to the present invention.

Claims (3)

delete A first step (S10) in which float glass enters the IN loading table to manufacture tempered glass; A second step (S20) in which the float glass entering the IN loading table is heated by hot coils on the upper and lower surfaces while linearly reciprocating the heating furnace according to the standard temperature and time according to the thickness thereof; ; The float glass heated in the second step is cooled by a cooler while linearly reciprocating during normal air pressure and cooling time at normal temperature according to the thickness of the float glass to control the particle size. A third step (S30) of adjusting the gap between the cooler of the upper and lower surfaces of the float glass in the cooling table according to each thickness to adjust the degree of warping of the finished glass; In the manufacturing process of the tempered glass, characterized in that it comprises a fourth step (S40) is an OUT loading table step of producing a finished tempered glass through the cooling table step of the third step (S30), The float glass has a thickness of 4mm to 19mm, the washing water temperature is 20 ℃ ± 10 ℃, the drying temperature is 35 ℃ ± 15 ℃, the heating temperature in the second step (S20) is the upper case 645 ° C. to 710 ° C., the lower part is 665 ° C. to 720 ° C., the heating time is 140 seconds to 1000 seconds, and the wind pressure cooled in the third step S30 is 4 KPa, the maximum wind pressure of 100%. In 3% to 95%, the cooling time is 70 seconds to 840 seconds. delete

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