CN100436354C - Preparation method of air strengthened glass - Google Patents
Preparation method of air strengthened glass Download PDFInfo
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- CN100436354C CN100436354C CNB2006100649173A CN200610064917A CN100436354C CN 100436354 C CN100436354 C CN 100436354C CN B2006100649173 A CNB2006100649173 A CN B2006100649173A CN 200610064917 A CN200610064917 A CN 200610064917A CN 100436354 C CN100436354 C CN 100436354C
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Abstract
The present invention discloses a preparation method for air toughened glass, which has the following steps: plate glass sheets are loaded and sent to a heating chamber after passing through a roller way; the plate glass sheets are heated; the plate glass sheets are cooled; the plate glass sheets are unloaded. The present invention is characterized in that the inner cavity of the heating chamber is at least divided into four sections; sealing doors with control devices are arranged at an inlet of the heating chamber and an outlet of each heating section; the integral heating temperature of the heating chamber is from 290 DEG C to 720 DEG C and is distributed in each heating section; the temperature between a prior heating section and a rear heating section increases in a trapezoid mode, and the temperature difference is from 100 DEG C to 150 DEG C; the heating time of each section is respectively from 100 seconds to 300 seconds; the glass moves forwards uninterruptedly in a unidirectional mode along the roller way, the moving speed of the glass is from 20 mm/s to 100mm/ s; an air blow cooling device is adopted in the cooling step, and the cooling time is from 180 seconds to 600 seconds. After being integrated by methods of heating, moving and cooling, the glass improved by the present invention is suitable for toughening ordinary and different coated glass. Traces of a roller can be eliminated, and stress speckles can be reduced. The present invention has the advantages of simple process, convenient operation and easy popularization and implement.
Description
Technical field
The present invention relates to the preparation method of air strengthened glass in the glass deep processing field.
Background technology
The air hardening steel technology is meant the glass enhancement techniques that improves the ordinary plate glass working strength by heat treatment process.
Air strengthened glass intensity is 2～3 times of simple glass intensity, good impact resistance, and Heat stability is good is not easy fragmentation under external force collision; Even broken, inner tension stress makes whole glass moment be broken into tiny particle, and bearing stress then makes fine particle press together, can not form big fragment, avoid the injury of glass fragment, so air strengthened glass belongs to shatter proof glass, in architectural widespread use to human body.
Simple glass is adopted at existing building window hole, and 40～50% heating and cooling power run off; Plated film energy-saving glass such as Low-E glass can greatly improve this power loss, but the intensity of plated film energy-saving glass is low, need utilize the air hardening steel technology to improve intensity, make it to have concurrently security and energy saving, could be extensive use of on buildings.Traditional air hardening steel technology mainly adopts the type of heating based on radiation and conduction, and these two kinds of type of heating can not heat the coated glasses such as Low-E with heat reflection.Though solved the air hardening steel problem of coated glasses such as Low-E recently by scrap build, still there are a lot of quality problems in the glass behind the tempering.
In traditional air hardening steel metallization processes, the sheet glass of room temperature state is sent in the high-temperature heating chamber by the rollgang that rotates, the lower surface direct contact heat capacity of glass is much larger than the high temperature roller-way of air, the heat that receives is much larger than upper surface, the two sides temperature difference causes glass periphery to scroll up, produce the distortion of pot shape, reduced the glass planeness; All glass weight focuses on than on the small area simultaneously, when lower surface is heated to soft state, very easily by the roller-way galled spots, forms so-called " roller seal " scratch;
In traditional air hardening steel metallization processes, rollgang adopts the rotation mode of " forward-stop-reverse " to carry glass, glass always is in the type frequently reciprocating state of " static-as to quicken-at the uniform velocity-deceleration-static-break-in ", the size and Orientation of the frictional force that lower glass surface is subjected to is always changing, glass itself is subjected to round-robin and stretches--compression process, cause the bulk glass distortion of soft state, planeness descends, the aggravation of lower surface degree of injury;
In the tradition air hardening steel metallization processes, refrigerating unit adopts circular hole formula air nozzle more, the cooling of " point " formula of formation, just go up with spray orifice between the spray orifice/speed of cooling of below glass is different, whole glass surface different zones produces different stressed conditions, not only form so-called " stress speckle " phenomenon, also cause the glass planeness to descend simultaneously.
The problems referred to above have had a strong impact on visual appearance, optical property and the use properties of toughened glass.This glass uses as cab windshield and viewing glass, can have a strong impact on field of view; As building curtain wall glass, cause scene image distortion and distortion, not only influence the outward appearance and the decorative effect of buildings, also influence interior of building personnel's euphorosia sense, be easy to generate eye strain even rocky sensation.Then can amplify this defective effect behind the surface coating.The toughened glass after the polishing can only be used in the strict field of some optical properties, but polishing process has also reduced strength of glass when improving optical quality of glazings, contradicts with the original intention of utilizing the air hardening steel process to improve strength of glass.
In recent years, more existing successful technical schemes have solved certain above-mentioned problem, have improved the quality of air strengthened glass to a certain extent.As publication number is that the Chinese patent application of CN1322685 and CN2481713 discloses in the tempering process glass with the unidirectional mobile technology of constant speed, can reduce glass surface scratch degree, but this method is only limited to the tempering of simple glass, can not be used for the tempering of coated glass; The problem that still has simultaneously the be heated inequality and the inhomogeneous cooling of glass.
U.S. Pat 5782947 discloses a kind of tempering technology with the glass zone heating, mainly be that traditional radiation heating method and microwave heating method are used in combination: utilize the radiation heating method with glass heats to first design temperature, utilize microwave heating method to be heated rapidly to the 2nd design temperature that glass can moulding then, this method is suitable for producing curved strengthened glass, can not be applicable to fully that the surface quality problems that exists in the production of plane toughened glass still can not get solving.
Summary of the invention
In order to solve the defective that exists in the above-mentioned existing air hardening steel technology, the purpose of this invention is to provide and a kind ofly can heat coated glass, reduce the scratch of roller seal, improve the preparation method that planeness behind the flat glass tempering reduces the air strengthened glass of surface damage degree with heat reflection.
To achieve these goals, the technical solution used in the present invention is as follows: a kind of preparation method of air strengthened glass, realized by following steps: 1) the glass load is sent into heating chamber step, 2 through roller-way) heating steps, and 3) cooling step, 4) the unloading piece step; It is characterized in that: described heating chamber inner chamber is divided into 4 sections at least, and the hermatic door that has control device is all installed in the exit of described heating chamber ingress and each heating zone; The Heating temperature of described heating chamber inner chamber is set to 290-720 ℃, be distributed in from low to high in each heating zone, temperature between last heating zone and back one heating zone is trapezoidal and increases progressively, and its temperature difference is 100-150 ℃, and be set to 100～300 seconds every period heat-up time respectively; Described glass is with the unidirectional uninterrupted reach of described roller-way, and its translational speed is 20～100mm/ second; Described cooling step adopts cold wind blower, and be 180～600 seconds cooling time.
Setting up separately of above-mentioned heating zone can have multiple mode, one: can be divided into 4 heating zones, the 1st, 2,3 section is adopted the electric stove wire radiation heating; The 4th section is adopted the convective air circulation heating; Its Heating temperature of every section is set to respectively: the 1st section 290-310 ℃; The 2nd section 440-460 ℃; The 3rd section 540-560 ℃; The 4th section 680 ℃.
Its two: can be divided into 4 heating zones, at least 1 section is adopted the convective air circulation heating in the 1st, 2,3 section, and all the other adopt electric stove wire radiation heatings; The 4th section is adopted the convective air circulation heating; Described Heating temperature is set to respectively: the 1st section 290-310 ℃; The 2nd section 440-460 ℃; The 3rd section 560 ℃; The 4th section 680-720 ℃.
Its three: can be divided into 4 heating zones, 4 heating zones adopt the convective air circulation type of heating respectively; Every section Heating temperature is set to respectively: the 1st section 290-310 ℃; The 2nd section 440-460 ℃; The 3rd section 540-560 ℃; The 4th section is 680-700 ℃.
According to specification size and the specification of quality to toughened glass, according to above-mentioned type of heating, heating zone can also be divided into multistage, and Heating temperature is scattered in a plurality of independently heating zones, is not damaged to guarantee the toughened glass surface quality that processes.
Above-mentioned cold wind blower adopts slot atomizer air grid type cold wind blower.
Ultimate principle of the present invention is:
1. changed the type of heating of a greenhouse heating in traditional tempering glass technology, adopt the glass heats technology of the many temperature sections in a Room, the thermal shocking of the 290-720 ℃ of heating temperature difference is distributed in 4 or the more heating zone, enter a back heating zone glass preheats design temperature in previous heating zone after again and continue heating, thermal shocking is little, glass deformation is little, and weight of glass is born by more roller, can alleviate even eliminate fully the scratch of roller to glass back greatly.
2. changed the rotation move mode of glass in traditional tempering glass technology with roller-way " forward-oppositely-forward ", employing is with glass unidirectional continual move mode in heat-processed, make glass keep the constant motion of a direction, the frictional force size and Orientation that the back side is subjected to is constant, reduces glass deformation degree and surface damage degree;
3. adopt the mode heating glass of hot-air convection heating, heated glass can not be subjected to the influence of glass surface membranous layer property, even various coated glasses such as rapid heating Low-E, the tempering of realization coated glass.
4. adopt slit cooling air grid technology cooled glass, the point type type of cooling of traditional circular hole formula air jet is made into the line formula type of cooling of slit type air spray line, improved heating glass refrigerative homogeneity, effectively reduce the defective of glass surface stress-difference, improve the planeness of glass surface.
After the present invention adopts technique scheme, it is as follows to have beneficial effect: (1) has added the convective air circulation type of heating in improved air hardening steel metallization processes, realized air hardening steelization, effectively improved the intensity of various coated glasses such as Low-E various coated glasses such as Low-E; (2) heating chamber is divided into some heating zones, be divided into 4 sections or more section, 290-720 ℃ temperature is divided into 4 or a plurality of temperature layer by the temperature difference, with the temperature distribution that raises piecemeal in each heating zone, make glass steadily enter another higher temperature range by a temperature range, the heat acclimation power of glass is progressively improved, realize its air strengthened glass planeness height, the little purpose of distortion; Image distortion is little when the cladding glass that constitutes, and visual appearance significantly improves; (3) refrigerating unit adopts slot atomizer air grid type cold wind blower, line formula cooling by slit type air blowing spray line has improved glass surface refrigerative homogeneity, makes its glass surface stress through air hardening steelization even, stress speckle degree alleviates 50%, even eliminates fully; (4) owing to adopted the integration technology of improved glass heats mode, move mode and the novel type of cooling, solved the unsolved always for a long time problem of toughened glass, not only can production ordinary flat toughened glass, and can also the various coated glasses of tempering, glass planeness behind the tempering, optical quality improve, and roller seal and stress speckle reduce even eliminate fully; Technology is simple, easy to operate, is easy to promotion and implementation.
Embodiment
The preparation method of air strengthened glass of the present invention comprises the steps: earlier glass to be positioned on the load platform, enters heating chamber by rollgang, after sending heating chamber, tempering cooling after the preheating, takes out through the unloading piece operation and is shaped to air strengthened glass; Above-mentioned heating chamber inner chamber is arranged with at least 4 heating zones, and 6 heating zones can be set at most; The hermatic door that has control device is all installed in the exit of each heating zone; Total Heating temperature in the heating chamber is 290 ℃-720 ℃, is laid in each heating zone from front to back respectively; Temperature between last heating zone and back one heating zone is trapezoidal and increases progressively, and its temperature difference is 100-150 ℃; Be respectively every period heat-up time 100～300 seconds; Specifically be set to: the 1st heating zone is 290-310 ℃; The 2nd heating zone is 310-460 ℃; The 3rd heating zone is 460-560 ℃; The 4th section is 560-720 ℃; Glass moves to unidirectional uninterrupted reach along with rollgang moves forward, and also can adopt the mode that moves back and forth; Translational speed is 20～100mm/ second; Each heating zone is closed the formation separate space by hermatic door, and heating separately is after to the last a heating zone is heated to top temperature, shift out heating chamber, the colling end that constitutes of air grid through being provided with slot atomizer again, through blowing with glass cools to normal temperature, be 180～600 seconds cooling time.
How much what heating zone was provided with determines when being divided into 4 sections, three kinds of modes can be arranged, the first so that the industrial scale of air strengthened glass is big or small: preceding 3 sections are adopted the electric stove wire radiation heatings; The 4th section is adopted the convective air circulation heating; It 2 is: at least 1 section is adopted the convective air circulation heating in preceding 3 sections, and all the other adopt electric stove wire radiation heatings; The 4th section is adopted the convective air circulation heating; It three is: 4 heating zones all adopt the convective air circulation type of heating.
In like manner, when heating chamber is divided into multistage,, Heating temperature is distributed in each heating zone according to above-mentioned principle design type of heating.
By the following examples technical scheme of the present invention is described in detail:
Embodiment 1:
Selecting a block specifications is 1000 * 1000 * 10mm ordinary plate glass, and the visual appearance inspection does not have defectives such as calculus, bubble, scuffing, milled processed periphery on the straight line edge polisher, clean dry standby.
Air hardening steel equipment is provided with load platform, heating chamber, cooling section and unloads fragment, and roller-way runs through in load platform, heating chamber, refrigerating work procedure and the unloading piece operation; Above-mentioned ordinary plate glass is placed on the roller-way on the load platform, starter motor, roller-way rotates, and this glass is sent into the heating chamber under room temperature state heated.This heating chamber is divided into 4 sections, and the 1st, 2,3 section is set to the electric stove wire radiation heating respectively, and promptly the upper and lower sides in heating zone is separately installed with electric stove wire; The 4th section is adopted the convective air circulation heating, promptly closed cabinet is set respectively at the body of heater upper and lower sides, heating unit is set in the case, two ends are provided with inlet, outlet up and down, inlet mouth links to each other with the blower fan exhaust side by pipeline, and the air outlet is a jet orifice plate, the gas heating glass surface of ejection, get back to fan air inlet then, form closed cycle.The ingress of heating chamber and the exit of each heating zone are separately installed with the hermatic door that has control device, and hermatic door is opened at any time or closed with its glass moving in heating zone by control device.Refrigerating work procedure is made of a refrigerating unit that is connected in the heating chamber exit, refrigerating unit is the slot atomizer air grid that is installed on the roller-way upper and lower, the high-power blower cold wind that compression is caused to outside air by peripheral hardware is evenly jetted by the glass of air grid after heating, reduces to room temperature up to glass; The unloading piece operation refers to cooled glass by taking out folded falling within on the glass frame on the roller-way.
Concrete technology: earlier above-mentioned glass is lain in a horizontal plane on the glass conveying roller way of air hardening steel equipment load platform, starter motor, roller-way rotates, and opens the hermatic door of heating chamber ingress, this sheet glass is sent in the 1st heating zone heated; The temperature of the 1st heating zone is set to 290 ℃, and be 300 seconds heat-up time; The unidirectional uninterrupted reach of glass, translational speed 20mm/ second; When moving to the 1st heating zone exit, the hermatic door in this exit is opened, and glass enters the 2nd heating zone, continues heating;
After glass entered the 2nd heating zone fully, the hermatic door in the 1st heating zone exit was closed, and temperature is set to 440 ℃ in the 2nd heating zone, and be 300 seconds heat-up time; Glass continues uninterrupted reach, and translational speed 20mm/ second, when glass moved to the outlet of the 2nd heating zone, the hermatic door in the 2nd heating zone exit was opened, and at this moment, glass moves to the 3rd heating zone, continues heating;
After glass entered the 3rd heating zone fully, the hermatic door in the 2nd heating zone exit was closed, and temperature is set to 540 ℃ in the 3rd heating zone, and be 300 seconds heat-up time, and glass continues uninterrupted reach, translational speed 20mm/ second; When glass moved to the outlet of the 3rd heating zone, the hermatic door in the 3rd heating zone exit was opened, and at this moment, glass moves to the 4th heating zone, continued heating;
After glass entered the 4th heating zone fully, the hermatic door in the 3rd heating zone exit was closed, and was set to the convective air circulation type of heating in the 4th heating zone, its Heating temperature is set to 680 ℃, be 300 seconds heat-up time, and glass continues uninterrupted reach, translational speed 20mm/ second.When glass moves to the outlet of the 4th heating zone, the hermatic door in the 4th heating zone exit is opened, glass shifts out heating chamber and enters refrigerating work procedure, glass the blow a cold wind over tempering of the air grid that in refrigerating work procedure, is provided with after to heating, this air grid adopts the air of slit, can make wind blow to glass surface with the fine rule shape, even to guarantee the glass surface refrigerative; The toughened glass cooling after 180 seconds, is moved into the unloading piece operation through roller-way again, glass is taken off, folded completion case is finished whole tempering preparation process.
In the whole process of above-mentioned process operations, the control device of the hermatic door in the hermatic door of heating chamber ingress and each heating zone exit is arranged on the operator's console in the heating installation outside that this patent adopts, control device is carried out synchronization control to the hermatic door of heating chamber ingress and the hermatic door in each heating zone exit, and glass is identical through the heat-up time of each heating zone and the speed of reach.
Embodiment 2:
In the glass size of selecting for use and employed tempering apparatus and the operating process to heating glass in the speed of heat-up time of each section and the unidirectional reach of glass with embodiment 1, do not repeat them here.
Its difference is: this heating chamber is divided into 4 sections, and the 1st, 3 section is set to the electric stove wire radiation heating respectively, and promptly the upper and lower sides in heating zone is separately installed with electric stove wire; 2nd, 4 sections are adopted the convective air circulation heating, promptly closed cabinet is set respectively at the body of heater upper and lower sides, heating unit is set in the case, two ends are provided with inlet, outlet up and down, inlet mouth links to each other with the blower fan exhaust side by pipeline, the air outlet is a jet orifice plate, and the gas of ejection is got back to fan air inlet, forms closed cycle.
Concrete technology: earlier above-mentioned glass is lain in a horizontal plane on the glass conveying roller way of air hardening steel equipment load platform, starter motor, roller-way rotates, and opens the hermatic door of heating chamber ingress, this sheet glass is sent in the 1st heating zone heated; The temperature of the 1st heating zone is set to 310 ℃, and be 200 seconds heat-up time; The unidirectional uninterrupted reach of glass, translational speed 50mm/ second; When moving to the 1st heating zone exit, the hermatic door in this exit is opened, and glass enters the 2nd heating zone, continues heating;
After glass entered the 2nd heating zone fully, the hermatic door in the 1st heating zone exit was closed, and temperature is set to 460 ℃ in the 2nd heating zone, and be 200 seconds heat-up time; Glass continues uninterrupted reach, and translational speed 50mm/ second, when glass moved to the outlet of the 2nd heating zone, the hermatic door in the 2nd heating zone exit was opened, and at this moment, glass moves to the 3rd heating zone, continues heating;
After glass entered the 3rd heating zone fully, the hermatic door in the 2nd heating zone exit was closed, and temperature is set to 560 ℃ in the 3rd heating zone, and be 200 seconds heat-up time, and glass continues uninterrupted reach, translational speed 50mm/ second; When glass moved to the outlet of the 3rd heating zone, the hermatic door in the 3rd heating zone exit was opened, and at this moment, glass moves to the 4th heating zone, and convection current continues heating;
After glass entered the 4th heating zone fully, the hermatic door in the 3rd heating zone exit was closed, and the 4th heating zone Heating temperature is set to 720 ℃, and be 200 seconds heat-up time, and glass continues uninterrupted reach, translational speed 50mm/ second.When glass moves to the outlet of the 4th heating zone, the hermatic door in the 4th heating zone exit is opened, at this moment, glass moves to refrigerating work procedure, the air grid blowing tempering that is provided with in refrigerating work procedure cooled off after 600 seconds, and cooling fan adopts the slit type air outlet, make its can multi-angle, multiple duct with wind to glass surface, guaranteed that the glass surface refrigerative is even; Cooled toughened glass through roller-way shift-in unloading piece operation, is taken off glass, and folded completion case is finished whole tempering preparation process.
Embodiment 3
In the glass size of selecting for use and employed tempering apparatus and the operating process to heating glass in the speed of heat-up time of each section and the unidirectional reach of glass with embodiment 1, do not repeat them here.
Its difference is: the heating chamber inner chamber is divided into 4 heating zones, and 4 heating zones all adopt the convective air circulation type of heating.
Concrete technology: earlier above-mentioned glass is lain in a horizontal plane on the glass conveying roller way of air hardening steel equipment load platform, starter motor, roller-way rotates, and opens the hermatic door of heating chamber ingress, this sheet glass is sent in the 1st heating zone heated; The temperature of the 1st heating zone is set to 300 ℃, and be 100 seconds heat-up time; The unidirectional uninterrupted reach of glass, translational speed 100mm/ second; When moving to the 1st heating zone exit, the hermatic door in this exit is opened, and glass enters the 2nd heating zone, continues heating;
After glass entered the 2nd heating zone fully, the hermatic door in the 1st heating zone exit was closed, and temperature is set to 450 ℃ in the 2nd heating zone, and be 100 seconds heat-up time; Glass continues uninterrupted reach, and translational speed 100mm/ second, when glass moved to the outlet of the 2nd heating zone, the hermatic door in the 2nd heating zone exit was opened, and at this moment, glass moves to the 3rd heating zone, continues heating;
After glass entered the 3rd heating zone fully, the hermatic door in the 2nd heating zone exit was closed, and temperature is set to 550 ℃ in the 3rd heating zone, and be 100 seconds heat-up time, and glass continues uninterrupted reach, translational speed 100mm/ second; When glass moved to the outlet of the 3rd heating zone, the hermatic door in the 3rd heating zone exit was opened, and at this moment, glass moves to the 4th heating zone, and convection current continues heating;
After glass entered the 4th heating zone fully, the hermatic door in the 3rd heating zone exit was closed, and the 4th heating zone is set to the convective air circulation type of heating, and its Heating temperature is set at 700 ℃, and glass continues uninterrupted reach, translational speed 100mm/ second.When glass moves to the outlet of the 4th heating zone, the hermatic door in the 4th heating zone exit is opened, at this moment, glass moves to refrigerating work procedure, the air grid blowing tempering that is provided with in refrigerating work procedure cooled off after 360 seconds, and cooling fan adopts the slit type air outlet, make its can multi-angle, multiple duct with wind to glass surface, guaranteed that the glass surface refrigerative is even; Cooled toughened glass through roller-way shift-in unloading piece operation, is taken off glass, and folded completion case is finished whole tempering preparation process.
Adopt the air strengthened glass of the present invention's preparation, standard GB/T 9963-1998 according to toughened glass detects, mass parameters such as its transmittance, shock resistance, fragment state, canister shot bag impact property, resisting wind press capacity meet the regulation of national standard fully, planeness is bow camber degree 0.5% in the standard then, the regulation of waveform sinuousness 0.3%.Although there is not the counter stress speckle to stipulate in the standard, the disadvantageous effect that existence produced of stress speckle has caused user's attention, therefore in toughened glass standard revision declaration version, has increased the data illustrative appendix of counter stress speckle.The air strengthened glass of the present invention's preparation almost be can't see the existence of stress speckle.
In addition, the present invention has adopted radiation-convection current bonded heating technique, compares with the microwave heating technique in the United States Patent (USP), and cost reduces, technology maturation, and device structure is simple, and is easy to operate, is easy to apply.
Claims (4)
1. the preparation method of an air strengthened glass, realized by following steps: 1) the glass load is sent into heating chamber step, 2 through roller-way) heating steps, 3) cooling step, 4) the unloading piece step; It is characterized in that: described heating chamber inner chamber is divided into 4 sections at least, and the hermatic door that has control device is all installed in the exit of described heating chamber ingress and each heating zone; The Heating temperature of described heating chamber inner chamber is set to 290-720 ℃, be distributed in from low to high in each heating zone, temperature between last heating zone and back one heating zone is trapezoidal and increases progressively, and its temperature difference is 100-150 ℃, and be set to 100～300 seconds every period heat-up time respectively; Described glass is with the unidirectional uninterrupted reach of described roller-way, and its translational speed is 20～100mm/ second; Described cooling step adopts cold wind blower, and be 180～600 seconds cooling time.
2, the preparation method of air strengthened glass according to claim 1, it is characterized in that: described heating zone is divided into 4 sections, and the 1st, 2,3 section is adopted the electric stove wire radiation heating; The 4th section is adopted the convective air circulation heating; Described Heating temperature is set to respectively: the 1st section 290-310 ℃; The 2nd section 440-460 ℃; The 3rd section 540-560 ℃; The 4th section 680 ℃.
3, the preparation method of air strengthened glass according to claim 1, it is characterized in that: described heating zone is divided into 4 sections, adopts the convective air circulation type of heating respectively; Described Heating temperature is set to respectively: the 1st section 290-310 ℃; The 2nd section 440-460 ℃; The 3rd section 540-560 ℃; The 4th section is 680-700 ℃.
4, as the preparation method of air strengthened glass as described in claim 1 or 2 or 3, it is characterized in that: described cold wind blower is a slot atomizer air grid type cold wind blower.
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| CNB2006100649173A CN100436354C (en) | 2006-03-17 | 2006-03-17 | Preparation method of air strengthened glass |
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| CN1824619A (en) | 2006-08-30 |
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