KR800000829B1 - Manufacture of float glass - Google Patents

Abstract

A method of manufg. float glass of a desired with and thickness wherein molten glass is delivered at a controlled mass flow a molten metal bath to establish a molten glass layer and while permitting the molten glass to flow freely laterably to its limit width and thickness, a glass ribbon is developed and subjected to a temp. regime while tractive forces are applied thereto.

Description

Plate glass recipe

1 is an elevational view of an apparatus comprising a tank having a molten tin bath and a roof thereof, and an apparatus for supplying molten glass at a controlled rate to the bath and releasing a final ribbon of thin suspended glass from the bath. ,

2 is a tank plan view of the device of the first degree excluding the roof,

3 is an elevation view similar to that of FIG. 1 of the retrofit device required to carry out the invention,

4 is a plan view similar to FIG. 2 for the FIG. 3 device,

5 is an elevation view similar to that of FIG. 1 of other devices required to carry out the invention,

FIG. 6 is a plan view similar to FIG. 2 for the FIG. 5 device.

The present invention provides that the molten glass is supplied at a controlled rate to the inlet of the molten metal bath and that the molten glass on the bath is developed on both sides without any obstacle to free flow to form a floating glass ribbon, and this ribbon Cooling while advancing along the bath and finally discharged from the bath relates to a method for producing a floating glass.

The molten metal bath generally means a bath of molten tin or tin alloy mainly composed of tin. The present invention relates to a process for producing suspended glass of various thicknesses, in particular thin suspended glass of 2 mm thickness or less.

Suspended glass up to 3mm thick is produced by controlling the viscosity gradient related to the adjustment of the tractive force required in the final glass ribbon produced.

In order to reduce the ribbon thickness to the desired thickness, the width must be reduced, and the size of the final glass ribbon produced is controlled by the amount of glass supplied to the inlet of the bath.

In other ways of producing thin suspended glass, the ribbon is hardened enough to fold the glass ribbon, and the ribbon is hardened enough to pick up while the glass ribbon passes through the bottom of the band where the glass ribbon can harden and pick up. There is a method of exerting traction that can be re-heated to attenuate the glass.

Floating glass from 3 mm to 7 mm thick has been produced by this method, and the size of the floating glass ribbon running along the bath from the high temperature inlet of the bath varies throughout.

The first floating glass ribbons were manufactured by performing a Control of attenuation of the ribbon in a better way than it is now without damaging the excellent turbidity of the floating glass—the lighting without gloss and distortion on the smooth surface. It is possible to produce thin suspended glass of 2 mm and even below thickness by the present invention by preventing the glass from being influenced by the unobstructed flow generated on both sides.

An object of the present invention is to provide a method for producing a floating glass having a characteristic thickness thinner than the initial glass ribbon thickness by proceeding uninterrupted the flow of both sides of the molten glass on the molten metal bath. Another object of the present invention is to provide a method for producing thin floating glass in large quantities, and to produce a thin glass of a wider width.

The present invention provides a method for producing floating glass having various thicknesses up to 1.5 mm by forming a molten glass layer on the bath surface by supplying the molten glass while controlling the flow rate of the molten glass. While the molten glass supplied to the bath flows freely on both sides up to its width and thickness, while spreading the floating glass ribbon on the molten metal bath, the traction force is applied to the glass ribbon flowing along the bath, and the flow rate is equalized from the bath. Increasing the final production rate and producing the ribbons of the width and thickness required by exerting the longitudinal force on the glass edges in attenuated areas where the glass simultaneously thins and shrinks. do. Advancing glass is defined as having a thickness and width that do not increase in width and that are required over the initial region adjacent to the molten glass layer and the final region adjacent to this initial zone. Refers to a ribbon having an edge. At least the lower process portion of the initial band includes the attenuating region described above. In some cases (eg Figure 2), the attenuation band is set over the entire initial band, while in other cases (eg Figure 4), the progress ribbon generally remains marginal at the beginning of the initial band. However, in both cases above, the width and thickness of the ribbon in the initial zone is no greater than the above-mentioned limit width and thickness. Progressive glass ribbons are subject to temperature conditions that keep the ribbon decaying as the velocity accelerates. All parts of the glass that pass through the original zone are in an unshaped fluid state.

The force exerted on the glass in the longitudinal direction of the ribbon gradually controls the reduction of the ribbon width and also acts on the damping force acting on the glass. In this way, the damping effect of the whole manpower is controlled and made into the ribbon of the width and thickness required by the progressive damping. The magnitude of the outward and longitudinal forces is related to the traction force sufficient to gradually control the simultaneous reduction in thickness and width of the advancing glass through the entire attenuation band and the force acting on the interface between the back of the advancing ribbon and the surface of the bath. It is also designed to maintain the smooth edge of the front ribbon without increasing its width.

The method of the present invention is used to produce floating glass having a thickness of 6 mm or less. In particular, the present invention provides a method for producing floating glass having a thickness in the range of 3 mm to 1.5 mm according to the above-mentioned manufacturing method.

The present invention is particularly effective in producing 2mm floating glass.

According to the invention the floating glass properties are maintained for all the glass produced according to the invention and the distortion of the glass surface can also be eliminated.

In FIGS. 1 and 2, (1) refers to the furnace in a continuous glass melting furnace and (2) to the regulating tweel. The twill regulates the flow of molten glass through an outlet (3) consisting of ribs (4) and side walls (5). The sidewalls and ribs combine to form an outlet of generally rectangular cross section. The outlet is located at one end of the tank containing the molten metal bath 7, ie a molten tin bath or a molten tin alloy bath mainly composed of tin. The tank structure consists of a bottom (8), side wall (9) and a single wall (10) at the outlet of the vessel, and the bottom (8), side walls (9) and end walls (6), (10) combine to form a single tank. To form a structure. The height of the molten metal bath 7 is 11, and the distance between the side walls 9 of the tank is always larger than the glass width of the bath. Therefore, the surface width of the molten metal bath is wide so that the molten glass flow on the bath can flow freely on both sides.

The tank structure consists of a roof 12, end wall 13 of the bath inlet end, outlet 3, roof portion 14 and side wall 15 above, and end wall 16 of the vessel outlet end. I support it. The roof structure forms a conduit over the bath, called an overhead space, which is filled with filler to prevent air from entering through the conduit 17 which is connected to the header 18.

The inlet end wall 13 of the bath inlet end forms a limited height inlet 19 through which the molten urine layer in the bath can proceed, such as the molten metal bath surface 11, and the outlet end wall 16 of the roof structure is a tank. It forms an outlet 20 together with the structural outlet end wall 10, through which the final ribbon of thin glass discharged from the bath is discharged by the traction roller 21 installed in accordance with the preceding method at the outlet 20 level, In addition, the height is limited accordingly.

The vertical space of the outlet lip 4 on the molten metal bath surface 11 is about 15 m, and the heel 22 of the molten glass flows into the bath at the outlet and is a piece of glass such as sodium-lime-silicon glass. This heel extends to the end wall 6 of the outlet lip lower tank of the latter. The molten glass that falls freely on the surface of the bath at the outlet lip flows from the outlet to the rear surface of the glass to the rear of the bath, and the portion formed as the upper surface on the outlet flows from the outlet. It becomes the surface of the molten glass layer 23 formed on the surface of and continues to advance. In this way, the curvature generated by the physical contact between the discharge port and the molten glass is the minimum among the curvatures formed at the corners of the molten glass layer of the bath and the curvatures of the molten glass formed at all portions except the corner portions of the molten glass 23. do.

The temperature controller 24 in the space of the inlet-end molten metal bath and the temperature controller 25 immersed in the bath allow the molten glass to flow freely to both sides without any problem to the limit that the molten glass can flow freely at the beginning of the process. Adjust the thermal conditions at the inlet end of the bath.

Thermostats 24 and 25 adjust the temperature conditions affecting the glass as it progresses along the bath, where the temperature condition increases the speed of the glass to produce the final ribbon of floating glass. Gradually attenuate to keep the longitudinal portion of the ribbon deformable. The temperature condition generally decreases gradually as the glass passes through the bath and temperature control using thermostats 24 and 25 is used locally, such as when heating briefly while attenuating the ribbon.

e)과 같은 힘의 작용하에서 자유흐름의 한계에 도달함으로서 이룩된다.The operation method described in FIGS. 1 and 2 is for producing a floating glass of 3mm thickness. The molten sodium-lime-silicon-glass is charged to the surface of the molten metal bath 7 at a rate of about 3,000 tons / week, and the glass flows on both sides until it is about 6.4 m wide after loading on the surface of the bath. This width is the motive force for glass to advance surface tension, gravity as well as glass to the bottom of the bath.

This is achieved by reaching the limits of free flow under the action of force as in e).

The free flow ends on both sides of the glass are about 4.5 m below the bath, at which point the glass temperature is about 1.025 ° C and the glass thickness is less than 7 mm.

The molten glass layer 23 thus formed on the bath proceeds in the form of a ribbon, and the initial ribbon thus formed is glass having a low viscosity of about 10 ^4.2 poise.

The glass in this ribbon is gradually cooled using the regulators 24 and 25 while the initial ribbon runs along the bath at an initial rate of 2.5 m / min. For some time the viscosity of the glass is still low and is added by the propensity to flow inward to maintain the glass thickness, unless the tendency to decrease in width caused by the traction force applied at the outlet end of the bath is suppressed.

While the glass is running the initial 18 m along the bath in this embodiment, the glass is constrained by a temperature gradient that is lowered to about 840 ° C., the viscosity of which corresponds to 10 ⁶ poise. At this point when the glass viscosity rises, the inward flow of the glass to return to the original thickness is significantly reduced.

The point at which the glass viscosity reaches about 10 ⁶ poise is defined by a partition 26 extending across the upper space and descending near the surface of the glass ribbon running along the bath depending on the roof structure. Partition 26 is 18 meters from the inlet end wall of the tank. The drawings are not to scale, but are for illustrative purposes only.

The glass ribbon when the increase jeopdo range of silicon glass is 10 ⁴ to 10 ⁵ poise degree, the glass viscosity of up to 10 ⁵ poise in by the location of the outlet end roller (21), most of the molten sodium flows through the first 18m of the bath-lime The longitudinally actuated traction applied to the upper process has a greater effect on stretching the ribbon, since the glass increases in viscosity to withstand greater attenuation.

However, in order to maintain the glass width when the viscosity of the glass is low at first, a pair of angled top rollers 27 and 28 are provided on both sides of the tank at a distance of about 9 m from the inlet end wall 6. The toproll is made of coarse graphite or stainless steel, which is mounted at the center of the shaft and connected to the side wall of the tank, and the toproll is used after the initial ribbon begins to run along the bath. It's about to snap the top surface of the glass ribbon edge.

The glass temperature in this area is 950 ° C and the viscosity is about 10 ^4.6 poises. The saw roller is given an angle of about 5 ° to 7 ° (as shown in the figure) with the vertical axis of the ribbon running direction, so that the outward force exerts the longitudinal force on the edge of the initial ribbon. do. The rolls 27 and 28 are driven at a speed that can travel through glass edges at a speed of about 2.9 m / min. The outward force component also prevents a significant decrease in width.

The width of the glass is reduced to about 6.1m, and the thickness of the glass is slightly reduced due to the traction force that slightly attenuates the glass by the frictional force between the glass and the bath, which is added by the action of the top rollers 27 and 28. do.

A pair of top rollers 29 and 30 are installed below the baths from the top rollers 27 and 28 to a temperature of about 900 ° C., which has a glass viscosity of about 10 ^5.2 poises. It acts almost the same as the saws 27 and 28 at the edges of the glass that progress to a somewhat lower temperature. At this time, the glass still tends to decrease in width due to the attenuation effect due to surface tension and traction. Top angles 29 and 30 are given, and driven to advance the glass at a speed of 3.5 m / min, and the siting of the top rollers 29 and 30 is a glass saw. By the time it passes through the opposite sides of the rolls 29 and 30, the width of the ribbon is maintained at 6 m while the glass thickness is reduced to about 6 mm.

Through this process, when the glass proceeds to the lower processes of the top rollers 29 and 30, the flow of both sides that proceeds without any obstacle is accelerated from 2.5 m / min to 3.5 m / min while maintaining the glass characteristics. .

The cooling that the glass advances toward the partition 26 continues, and at the time the glass passes through the partition 26, the width becomes 5.4 mm and the thickness decreases to 6 mm or less.

Between the partition 26 and a similar partition 31 located below the 12 m bottom process there is a limited reheat zone consisting of a ceiling heater 32 and a bath heater 33 which are required to reheat the glass to about 870 ° C. while the glass is running. Reh-eatingzone.

The roller 21 at the outlet end of the bath releases the final ribbon 36 of thin suspended glass at a speed of 12.5 m / min from the bath. Therefore, there is intensive acceleration of the glass in the reheat zone, and when the glass passes under the partition 31, the thickness is rapidly thinned to 3 mm. At this time, the glass temperature is reheated up to 870 ° C with a viscosity of about 10 ^5.6 poise at about 1/2 point along the reheat zone, in this state acting in the longitudinal and transverse direction of the ribbon and acting on the edge glass. Another pair of corner saw rollers 34 and 35 to act progressively on the damping effect and to apply a marginal force to the glass that prevents a decrease in the width that may occur during rapid acceleration of thinning of the glass. ) Is required separately.

The longitudinal action on the traction reduction effect is given by the saw blades 27 and 28 and 29 and 30 as well as the force at the interface between the glass ribbon and the bath. The corner force exerted by the roll acts effectively in the longitudinal direction when the glass is attenuated and gradually adjusts the attenuation to the thickness required by the glass.

)(Tuned system)을 만들기 위하여 온도 상태를 결정할 시에는, 유리/금속간의 계면력에 의한 감쇄 작용뿐만 아니라, 그 위치에서 유리에 가해진 기타 가속력과도 관련됨을 고려해야 한다.The speed of the saw roller at each position acting on the edge of the glass ribbon should also be determined in relation to the flow rate of the glass supplied to the bath. The system in which the ribbon 36 is discharged from the bath and the force applied to the edges of the glass at each position (

When determining the temperature state to create a tuned system, consideration should be given to the attenuation caused by the interfacial forces between the glass and metals, as well as other accelerations applied to the glass at that location.

When the glass passes the partition 31, the glass thickness is 3 mm and the width is 3.5 m. As a result of adjusting the heaters 32 and 33 installed in the reheating zone, the glass ribbon has a temperature of about 830 ° C. and a glass viscosity of 10 ^6.2 poise as it passes through the partition 31. The glass is thermally stable. After passing through the partition 31, glass cooling continues while the glass is in progress, but there is no further change in width or thickness. The glass proceeds at a highway of 12.5 m / min while the glass then runs along the bath and cools to about 650 ° C. upon reaching the tank structure exit.

A thin glass ribbon of 3mm is a high velocity that travels along the surface of the bath and a high acceleration that occurs when the ery is attenuated, which allows the damping force to act effectively in the longitudinal direction. Generates interfacial force of liver. Glass attenuation in the reheat zone is caused by the action generated by the interfacial forces acting in contact with the three pairs of saw blades 27 and 28, 29 and 30 and 34 and 35. If the traction force on the area is small while the glass is hindered on both sides by the action of the top rollers 27 and 28 and 29 and 30, reduce the initial ribbon thickness only slightly, as described above. However, if sufficient traction is transferred to the upper process of the partition 26, the initial ribbon will proceed along the upper process of the hot area of the bath.

Three pairs of saw rollers 27, 28, 29, 30, 34, and 35 are all provided at an angle with the side wall of the tank. This angle is between 0 ° and 10 ° with the direction perpendicular to the ribbon direction of travel. Even if the axis of the saw roller is perpendicular to the tank shaft wall, because of the edge profile of the glass ribbon, which has a progressively decreasing width even in plan view, the roller can effectively exert outward and longitudinal forces on the glass.

An example of another method of making a 3 mm thick floating glass in the implementation described in FIGS. 3 and 4 is given. The molten glass is supplied to the molten metal bath surface at a flow rate of 2,600 tons / week, and when the bath is reached, the glass flows outward to form a layer 23 having a width of 6.35 m on the bath surface.

This width can be obtained when the glass reaches the limit at which glass can flow freely under surface tension and gravity action, as well as the driving force for advancing the glass to the bottom of the bath. Free flow stops after the glass has advanced about 4.5m down the bath. The glass temperature in this zone is about 1,025 ° C and the glass thickness is just under 7mm.

Sufficient traction from the exit of the bath is transferred to the upper process to advance the ribbon glass of the same width obtained at the limit of free flow, and so on until the glass viscosity increases to a deformable viscosity The temperature is controlled to cool the glass. If the glass is sodium-lime-silicon glass, the glass viscosity during the uninterrupted bilateral flow of glass is 10 ^4.2 poise, and the glass temperature is enhanced to about 870 ° C. while the glass is running about 15 m along the bath. The glass viscosity of is 10 ^5.5 poise. This longitudinal pull on the viscosity value is much more effective at deforming the ribbon.

When the glass is in this state, the glass gradually enters the area of the ribbon that is attenuated, and a force is applied to the ribbon edge to control the attenuation to set the magnitude and direction of the glass velocity at the ribbon edge at any particular point. This position is specified by installing a pair of inclined top edge rolls 37 and 38 installed about 15 m away from the inlet end wall 6 of the tank structure. The saw rollers are secured to the shaft cores 39 and 40, respectively, which are secured in a gland extending through the side wall 9 of the tank structure. The saw rollers are fixed on opposite sides and are inclined at an angle of 5 ° to the transverse axis, which acts as a directional and longitudinal component at the edge of the ribbon. The saws 37 and 38 are driven at a rate at which the advancing speed of the glass edge is 2.5 m / min and the temperature can be about 870 ° C. when the glass is adjusted by the saw. The glass width gradually decreases to about 6.1 m, and it is inevitable that a slight decrease in glass thickness occurs.

As the glass passes through the saws 37 and 38, the temperature gradually drops to about 810 ° C., while the progressive reduction of the ribbon continues as it progresses there. In order to gradually reduce the ribbon width when the glass is attenuated, other saw blades 41 and 42 are installed about 9 meters below the saw blades 37 and 38. The rolls 41 and 42 are fixed to the ends of the shaft centers 43 and 44, which are moved by the chucks of the side walls 9 of the tank, respectively, and are inclined at an angle of 7 ° to the transverse direction of the tank.

Since the saw rollers 41 and 42 move at the same speed as each other, these saw rollers are adjusted to be 3.9 m / min inwardly as described in the forward traveling speed at the glass edge. Prior to the glass reaching the tops 41 and 42, a temperature condition is used to increase the effectiveness of the force acting by the tops 41 and 42, which prevents the ribbon width from decreasing when attenuated. Adjust to reheat to about 830 ° C.

The glass is accelerated while the glass passes through the area between the installation site of the saw rollers 37 and 38 and the installation site of the saw rollers 41 and 42, and the speed of the saw rollers 41 and 42 is Determining by considering the set speeds of the rolls 37 and 38 affects the damping effect of the traction force acting on the longitudinal upper process from the outlet end of the bath so that the applied corner force is adjusted as described above. The attenuation effect of the acceleration of glass can be gradually increased.

This corner force acting by the saw roller serves to make the glass effective in the reduction effect of the traction in the longitudinal direction of the deformable area.

After the glass has passed through the lower steps of the top rollers 41 and 42, the temperature of the glass is cooled from 820 ° C to about 780 ° C, where the temperature (780 ° C) is obtained when the glass has advanced about 9m. At this temperature the glass has a viscosity of about 10 ^6.8 poise, which is no longer deformed by the action of the traction force acting on the final glass ribbon by the rollers 21 at the outlet end. This roller 21 releases the thin glass ribbon 36 from the bath at the same rate as the flow rate of 2,600 tons / week of molten glass supplied to the bath, at which time the speed is greatly increased to 12 m / min. The glass is accelerated rapidly after the glass passes through the top rollers 41 and 42 to maintain a subsequent advancing speed of 12 m / min when the glass is firm enough to maintain the defined dimensions. The ribbon 36 is 3.1 m wide and 3 mm thick. The suspended solids obtained in layer 23 by uninterrupted bilateral flow remain intact while the ribbon attenuates. As well as adjusting the width of the ribbon to gradually reduce the width of the ribbon, it acts on the damping force, as shown in Figure 4, and the glass ribbon, as shown in Figure 4, is a gradual change in the dimensional dimension of the glass, which is in good agreement with the progressive viscosity increase of the glass when the force applied to the glass is reduced It has a smooth edge shape indicating that it has been achieved, thereby maintaining the floating properties in the glass during glass production.

method)으로서 원천적인 이익이 있다.The gentle heat treatment applied to the glass ribbon during the course of the glass reduces the distortion generated on the glass surface by the attenuation method. Here, an absolute safe recipe for producing suspended glass, usually 6 mm to 7 mm thick, even if the saw arrangement does not work due to the fact that the edges of the ribbon are in contact with the edges, or even in the event of failure, simply by increasing the thickness. (Fail-saf

as a method).

The thin ribbon 36 is cooled to about 600 ° C. until it reaches the outlet from the tank, and the rate of 12 m / min at which the ribbon exits is induced between the glass and the molten metal surface through the entire zone where the glass is attenuated. Although the forward traveling speed of the glass is very low near the hot inlet of the bath, the interfacial forces present between the low viscosity glass and the molten metal are effective in that process because of the low viscosity of the glass.

Since the glass viscosity of the portion acted by the saw roller is in this manner, the adjustment which affects the forward traveling speed of the ribbon is suitably in the 90 degree direction with respect to the ribbon. The edge forces exerted by the saw blades 41 and 42 and the interfacial forces between the glass and the metal in the region and in the sub-region processes act as attenuation forces on the lower glass processes of the saw blades 41 and 42. Are combined to function effectively.

Similarly, the effects of top rollers 37 and 38 will control the speed of the ribbon across the ribbon and act on the ribbon zone between the rolls 37 and 38 and the rolls 41 and 42. Effectively adjust the damping power. The angular velocities of the saws 37 and 38 are selected to control the initial stage of the process for progressively attenuating the ribbon in the process of making the glass of the required width and thickness. That is, the force acting on the interface adds the action caused by the saw blades 37 and 38 and 41 and 42, and the effective action required is distributed in the longitudinal direction in the area where the ribbon is attenuated. Consideration should be given when determining the angle and speed of the saw blade. Only sufficient traction connects the top processes of the saw blades 37 and 38 to allow the initial glassbone to proceed at an initial speed of about 2.5 m / min along the hot area of the bath.

5 and 6 illustrate a retrofit method that achieves an effective action by using another pair of saw rollers 45 and 46 in the attenuation band. The first pair of saw rollers 37 and 38 were installed at about the same position as in FIG. 3 and 4, and the pair of saw rollers 41 and 42 in FIG. 2 were similarly installed. The dimensions in FIGS. 5 and 6 are indicated with the same scale as in FIGS. 3 and 4. Another pair of saw rollers 45 and 46 are installed at about 4.5m below the second process of the second pairs 41 and 42 and the center of the third pair 45 and 46 47 and 48 are connected to the tank construct at the same 7 ° angle as the axis of the roll 41 and roll 42.

The edge of the glass can be further adjusted in this way in the final stage of attenuation, in which the glass velocity increases rapidly. By arranging three pairs of saw rollers in this way, 3mm glass can be produced at a speed of 2,600 tons / week. The layer of floating glass is made to have a typical thickness, about 6 mm to 7 mm, and the layer is cooled to about 860 ° C. as the glass proceeds toward the top 37 and 38. The saw rollers 37 and 38 give the ribbon edge a forward running speed of 2.8 m / min and the second of the saw rollers at the initial temperature of 820 ° C. in the lower process of the saw rollers 37 and 38. The temperature is cooled to 820 ° C. when the glass has advanced to the point where pairs 41 and 42 are located. These rolls 41 and 42 give a forward edge of 4.4 m / min to the glass edge and form an angle of 7 ° to prevent the ribbon from gradually decreasing in width when the glass is accelerated. It acts as a factor.

The glass is heated to about 840 ° C. before passing through the position of the third pair of saw rollers 45 and 46, and the rolls 45 and 46 have a forward running speed of 5.6 m / min. The glass is then cooled to about 815 ° C. while the ribbon's final speed is then accelerated to 10 m / min.

At each part of the continuous position where the ribbon is controlled by the saw roller, an outward component force is applied, and the ribbon speed at each position is closely related to the ribbon speed at the other position, thus reducing the required damping force at the continuous position. To do so, it must work effectively at each location.

By controlling the force settings and interactions along the entire ribbon in this way, an effective action can be achieved for the gradual control of the traction effect on the deformable glass. By doing so, it is possible to produce a ribbon having a gentle edge shape indicating that the ribbon is gradually attenuated to the thickness and width required in a state where the temperature is somewhat lowered. The width of the final ribbon 36 having a thickness of 3 mm is 3.3 mm, and the progressive reduction of the width to this final width by the operation of the saw roller ensures that the curvature of the glass surface can be avoided during the rapid decay of the glass. Doing. The apparatus described in FIGS. 5 and 6 can be used to produce thinner glass by adjusting the speed of the three pairs of top rollers and the traction rollers 21 at the outlet end. In the manufacture of a glass ribbon having a thickness of 2.5 mm and a width of 2.8 m at the same temperature and the same flow rate of 2,600 tons / week, the forward speed of the corners of the top rollers 37 and 38 is 2.8 m / min. The top rollers 41 and 42 are 4.2 m / min, and the top rollers 45 and 46 are 5.4 m / min. The roller 21 ejected the ribbon at a speed of 15 m / min and there was no defect in the quality of the thin floating glass thus produced.

Floating glass, 2 mm thick and 2.8 m wide, is produced by further adjusting the correlated speed. When the flow rate and temperature conditions are the same and the discharge rate of the ribbon from the bath is 18 m / min, the top rollers 26 and 27 are subjected to the second roll pair 30 at a slightly increased speed of 3.1 m / min. And 31 are driven to a speed of 5.3 m / min and the third roll pairs 37 and 38 to a speed of 6.7 m / min.

If rapid acceleration in the hot cross section of the bath does not change the initial floating properties, this increased interfacial force increases the longitudinally effective control in areas where the glass rapidly decays to 2 mm thick. effective.

Where high speeds are required at the edges of the ribbon, sharp toothed edge rolls of heat-resistant stainless steel are used, but the ribbon edge is used as a top roller to set the direction and size of the glass velocity at the edge of the ribbon at each roll position. A rough surface smoking roll is used for effective treatment of this. This makes it possible to effectively control the edge speed of the glass, and is particularly effective for adjusting the acceleration of the ribbon edge at the same speed as in the center part of the ribbon, especially in the high speed manufacturing required to produce 2 mm thick glass.

The angle setting of the described saw blade must first be determined. In each implementation the first pair of saw blades maintains an angle of zero to five degrees, and the second and subsequent saw blade pairs maintain angles of five through ten degrees.

By further adjusting the driving speed of the top roller and the traction roller 21 on one side without a large change in the temperature condition, thinner glass such as 1.5 mm or less in thickness can be produced at a discharge speed of about 28 m / min. If necessary, an additional saw roller may be installed in a separate position to make the traction work more effective in the deformable area of the ribbon and, as such, required about 24 m / min from the bath to make glass less than 1.5 mm thick. It is possible to achieve a gradual attenuation effect due to glass acceleration acting uniformly on the glass even under high speed.

In all the production process according to the present invention described above, it is fortunate that the progressing ribbon and the progressing ribbon having a smooth edge shape are defined as not increasing in width. In this regard, the ribbon of FIG. 2 shows gradually while passing through an initial band consisting of the molten glass layer 23 and the final band having the thickness and width required by the ribbon (the entire initial band becomes an attenuation band). The width is decreasing. The ribbons of FIGS. 4 and 6 are also gradually decreasing in width in the attenuation bands. However, if the ribbon runs from the beginning to approximately the same width as the width formed at the free flow limit point, the attenuation band will only include the lower process band of the initial band, which is comprised between the molten glass layer 23 and the final band. As described above, the ribbon having a gentle edge shape means that the ribbon is manufactured to the required thickness and width by gradually reducing the ribbon to gradually attenuate the ribbon so that there is no distortion on the glass surface. In addition, the preparation method according to the present invention does not cause a change in the floating properties of the initial product in the hot cross section of the bath. The standard 7mm thick glass is produced, and as soon as the edges of the glass recover contact with the saw blade, the continuous production of thin suspended glass is quickly restored.

The absolute safe feature of this process is the annealing lehr through which the ribbon of floating glass passes. As is known in a facility that is driven at a high speed, such as a tow roller 21, it is particularly important for high speed operation.

It is therefore an effect of the present invention to provide an improved general manufacturing method for the production of floating glass of all thicknesses which are produced as thicknesses from 6 mm to 1.5 mm thick and below. If there is no significant change in the temperature of the glass produced, it can be changed quickly by changing the installation and speed of the saw roller without causing such a loss in the production of the product. Manufactured glass is treated with flame surface at all thicknesses to form an excellent surface without any distortion.Because of the excellent surface properties of the glass, bending and toeghing are performed without any difficulty in producing a glass product. It can be used to make laminated glass articles such as laminated windscreens.

Claims (1)

As the molten glass layer is formed on the molten metal bath and proceeds in the form of ribbon, the traction acceleration force applied to the ribbon to eject the ribbon from the bath requires the width and thickness of the ribbon to gradually increase the speed of the glass running along the bath. To the speed sufficient to reduce to the value, and apply the marginal force to the ribbon in the direction at an angle to the ribbon's direction of propagation at both sides facing each other, The method of adjusting the thickness of the ribbon by setting the magnitude of the corner force in order to apply the force and outward component force of the ribbon in the direction of control of the ribbon.As the glass accelerates, the width and thickness of the ribbon continuously decrease at the same time. The edges exerted at multiple locations and applied at these locations The magnitude and direction of the force is set to provide the attenuating force acting on the glass in this sub-position process, and the outward component force of this corner force proceeds through the entire acceleration period, preventing the glass from decreasing in width. A method for producing a tubular glass according to the Float process, characterized in that it serves to gradually control the gradual and continuous reduction of the width and thickness of the ribbon.

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