JPH06100337A - Flat glass structure - Google Patents

Abstract

PURPOSE:To form a flat glass structure by assembling plural panes of flat glass, composed of plural planar parts having a straight-line folded part and a specific nearly equal radius of curvature on the outer periphery of a curved surface at right angles to the curved part at a prescribed interval. CONSTITUTION:A folding line is drawn with an electrically conductive coating such as a carbonaceous coating at a prescribed position in each pane of flat glass. Electrodes and sheathed heaters are installed at the ends thereof. A flexible heater is installed on the whole surface of the flat glass and a current is made to flow through the folding line to heat the flat glass at a prescribed temperature. The flat glass is then folded at 60-160rt. angle angle so as to provide the outer periphery with a radius of curvature within the range of 1-4 times the thickness of the glass and then annealed to prepare bent flat glass. The two panes 1 and 2 of the flat glass are then superposed through a spacer 3 made of Al, etc., so as to afford 3-60mm interval between the planar parts. A drying agent 4 is filled in the hollow part of the spacer 3 and a sealing material 6 such as butyl rubber is filled in the interval between the spacer and the flat glass. A caulking material 5 such as a silicone rubber is filled in the interval between the outside of the spacer 3 and the flat glass facing to the outside of the spacer 3 to provide the objective flat glass structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate glass structure for construction and general industry, and more specifically, a combination of two or more plate glasses each having a plurality of flat surfaces without bends at a predetermined interval. The present invention relates to a flat glass structure having

[0002]

2. Description of the Related Art In recent years, sheet glass has been widely used for various purposes such as building exteriors and interiors or for general industry, for example, windows, show windows, wall materials, doors, partitions, display cases, aquariums, furniture and the like. ing. In applications such as windows, it is often the case that a plurality of sheet glasses are stacked in order to prevent cold, especially in cold regions. Also in applications such as show windows for exteriors and display cases, there is a strong tendency to stack a plurality of sheet glasses from the above viewpoint. Conventionally, the corners of such windows, show windows, display cases, etc.
As shown in FIG. 6, a plurality of plate glasses are preliminarily stacked with a spacer or the like at regular intervals, and then sealed using a caulking agent and a sealing agent such as silicone rubber, and metal,
It was joined at a predetermined angle with a frame made of wood, plastic, or the like. However, in this method, the sealing material used for sealing between the glasses, such as butyl rubber, has poor weather resistance, so it is necessary to prevent direct light from hitting the seal portion of the spacer. Therefore, the frame depth was deep enough. Therefore, the appearance and the transparency of the corner portion are poor. Further, when a stainless steel frame or the like is used, the cost is increased and it is economically unfavorable. In order to eliminate such a defect, a method is conceivable in which the frames are directly abutted without using a frame, and the abutted portions are joined with a caulking material such as silicone rubber and a sealing material. However, in this method, since the sealing material such as butyl rubber is directly exposed to light, its life is extremely short and it is not suitable for practical use. As a method of removing the above-mentioned defects, there is known a method in which one plate glass is subjected to heat processing to form a bent portion having a predetermined angle, and two or more plate glasses having the bent portion are superposed at regular intervals. The method of making a bent part on one sheet of glass is
For example, a normal float plate glass is placed horizontally on the upper part of a mold having a bent portion having a predetermined angle, the whole plate glass is heated to about 500 to 580 ° C., and the bent portion is locally 700 to 750 ° C. It is performed by heating to a certain degree and molding on a mold by gravity or other external force to make a predetermined bent portion. However, in the method, the bent portion has a relatively large radius of curvature (for example, when the glass sheet has a thickness of 4 mm, the minimum radius of curvature is 35 to 40).
mm)), and when used for applications such as windows, show windows, and display cases, the object appears to be greatly distorted, which is not preferable. In addition, since the vicinity of the bent portion of the plate glass is exposed to a high temperature equal to or higher than the annealing temperature over a considerable range, distortion occurs in the vicinity of the bent portion of the sheet glass after molding over a considerable range, and there is a drawback that the distortion of the flat portion is large. Was there. FIG. 7 shows an example of a cross section in the bending direction of a sheet glass having a bent portion formed by the above method. The radius of curvature at the bent portion B ₁ is about 10 times the thickness of the sheet glass, and the AB ₁ and AB ₂ portions have a thickness d as an intermediate portion between the flat portions A ₁ and A ₂ and the bent portion B _1.
It is a part with several optical lengths that is distorted and has poor optical characteristics, and the flat parts A ₁ and A ₂ are also exposed to high temperatures, so that the flatness before heat processing can be maintained. However, there is optical perspective distortion and reflection distortion. A plate glass structure in which two or more such bent plate glasses are stacked also has various drawbacks of the above bent plate glass. Further, it is required that the plurality of laminated glass sheets have the same bending angle or radius of curvature. However, it is difficult for the above-mentioned conventional methods to meet such requirements.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a plate glass structure in which two or more plate glasses each having a plurality of flat plane portions seamless to a bent portion are fixed at a predetermined interval.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a plate glass structure comprising two or more plate glasses, spacers for defining the interval between the plate glasses at the peripheral portion of the plate glasses, and means for filling a gap between the plate glasses and the spacers. At
Each of the plate glass is composed of a plurality of flat portions having at least one linear bending portion, the radius of curvature of the outer periphery of the curved surface in the direction perpendicular to the bending portion is 1 to 4 times the thickness of the flat glass in the flat portion, The flat glass surface of the flat portion is substantially flat, and the above-mentioned radii of curvature are substantially equal to each other.

The present inventor has conducted extensive studies to eliminate the drawback that it is difficult to repeatedly make a glass having a constant radius of curvature by the above-described conventional method for bending a sheet glass, and as a result, at least one linear In a method for producing a single bent flat glass having a plurality of flat portions having a bent portion, a bending line is drawn at a position to be bent on the flat glass by using a conductive paint, and the glass of the flat bending portion is changed to the flat glass. After electrically heating to a temperature equal to or higher than the softening point of, by bending the plate glass along the bending line,
We have completed a method for manufacturing bent flat glass that allows repeated manufacture of bent flat glass with a constant radius of curvature.

According to the above-mentioned method for producing a sheet glass, since the method of electrically heating the glass of the bent line portion drawn on the sheet glass is adopted, the sheet glass is extremely locally heated to a predetermined temperature. You can Therefore, the flat portion other than the heated portion is not subjected to unnecessary high temperature heating, thermal deformation is completely prevented, and the flatness is maintained even after bending. Preferably, the parts other than the above-mentioned bent line parts are heated to a predetermined temperature below the glass softening point by radiant heating and / or heat transfer heating to reduce the two-dimensional internal stress in the plate glass and damage the plate glass during bending. Can be prevented. In addition, since the width of the heated area near the softening point along the fold line is narrow, it is possible to make the bent portion very sharp and to manufacture bent flat glass of the same size with the same bending angle with extremely good reproducibility. can do.

The bent plate glass produced by the above method has a very sharp bent portion, and the flatness of two adjacent flat surfaces is extremely good up to the vicinity of the bent portion. This is a surprisingly superior quality that cannot be imagined from conventional products.

The flat glass structure of the present invention comprises two or more bent flat glasses manufactured by the above method, which are fixed at a predetermined interval. Therefore, the above-mentioned bent flat glass has extremely sharp bent portions and bent portions. It has the characteristic of extremely good flatness up to the vicinity of
When used for applications such as show windows and display cases, objects do not appear to be distorted at all, and it is possible to reproducibly manufacture a flat glass structure having excellent characteristics that can not be imagined from conventional products. .

First, in the above-mentioned method for producing a bent sheet glass, any known material can be used as the conductive material used for drawing the folding line. The conductive material is preferably a conductive paint or metal or alloy such as carbon-based or metal-based such as silver, palladium, platinum or oxide-based such as tin oxide, for example, iron-nickel-chromium alloy, copper-tin. An alloy, an aluminum alloy, etc. are mentioned. Examples of carbon-based conductive paints include Bunny Height (F-525W-1) manufactured by Nippon Graphite Trading Co., Ltd.
H91 made by Hokuriku Paint Co., Ltd.
00 or D-1230 (modified) manufactured by Fujikura Kasei Co., Ltd. and the like. From these, the size, thickness, and
It can be appropriately selected according to the bending angle, the bending speed, the operating voltage, and the like.

The paste-like conductive paint is drawn linearly on the surface of the plate glass by screen printing, letterpress printing, spraying or transfer. The metal or alloy can be applied by metal spraying, CVD, or pyrolytic methods. In the metal spraying method, a mask having slits corresponding to bending lines is placed on a glass plate, the above metal is used as a conductive material, the metal is melted by an electric arc or flame, and blown from a nozzle with compressed air. Then, spray the plate glass surface and draw a bending line. In any of the above-mentioned methods, the drawn fold line is in close contact with the surface of the plate glass and can be printed accurately at a predetermined location. Screen printing and metal spraying are preferred because of their accuracy and simplicity. The number of folding lines is the same as the number of bent portions of the sheet glass constituting the sheet glass structure required as a product, and at least one is drawn on one sheet of glass. When a plurality of folding lines are drawn, they may be drawn in parallel or non-parallel to each other depending on the desired product shape. FIG. 4 shows an example of the shape of one sheet of glass that constitutes the sheet glass structure of the present invention.

The width of the bending line varies depending on the above-mentioned factors (that is, the size, thickness, bending angle, bending speed, working voltage, etc. of the glass sheet), but it is preferably 0. It is 3 to 3 times, and particularly preferably 0.5 to 1.5 times. When the width of the bending line exceeds three times the thickness of the plate glass in the flat portion, the range of the plate glass heated near the softening point is too wide and the bent portion is not sharp. If the width is less than 0.3 times, sufficient heating cannot be performed and the wall thickness of the bent portion decreases, which is not preferable. The thickness of the fold line varies depending on the type of conductive material and the method used to draw the fold line, but it suffices that the glass can be stably heated to a predetermined temperature for a predetermined time, and preferably 0.1 to several. It is preferably 100 μm, for example, 10 to 100 μm in the screen printing method and 30 to 300 μm in the thermal spraying method.

The folding line may be drawn on one side, both sides, one side and both end sides of the plate glass, or a loop connecting the both sides and both end sides. In general, when the plate glass is thin, a fold line is drawn only on the surface which is an outer side when the plate glass is bent. When the plate glass is thick, it is preferable to draw folding lines on both sides. When performing the dielectric heating described later, it is necessary to draw a fold line continuously in a loop shape.

The plate glass used in the method for producing the bent plate glass may be any one as long as it can be used for construction or general industry. The sheet glass may be produced by any known method, but since it is necessary for the flat portion of the sheet glass structure produced by the method of the present invention to have no distortion, a float formed on molten tin metal is used. Preference is given to using sheet glass. The plate thickness, shape and dimensions of the plate glass used are determined according to the purpose,
There is no particular limitation. There is also no particular limitation on its composition,
Plate glass having various softening points such as commonly used soda-lime glass, borosilicate glass, and high-strength crystallized glass can be used. The type of the plate glass is not particularly limited, and ordinary plate glass, netted plate glass, polished plate glass, shaped plate glass and the like are used. Further, the above plate glass may be subjected to various surface treatments such as heat ray reflective coating, non-reflective coating, specific pattern printing and surface etching.

As a method of electrically heating the glass of the bent line portion drawn on the plate glass, the method described below is preferably used. That is, a method in which a solid electrode having an appropriate shape is brought into contact with the bending line at the edge of the plate glass to supply power and heat, and a conductive high temperature gas frame that generates lithium ions etc. is brought into contact with the bending line at the edge of the plate glass. It is a method of heating by feeding power through, or a method of drawing a bent line in a loop shape and performing dielectric heating using a high frequency current. The current used in the above method is an alternating current of 50 or 60 Hz, which is generally used for commercial purposes, and 10
A high frequency current or a direct current of 0 KHz to 50 MHz is used. While any of the above types of current can be used in the method using the solid electrode, a high frequency current is preferable in the method using a conductive high temperature gas flame, and only a high frequency current can be used in the dielectric heating. The selection of the type of current to be used is determined in consideration of the type of method for heating the bent line portion, the size of the plate glass, and the like. In addition, the control of the electric heating, the thickness of the plate glass used,
Considering the dimensions, the width of the bending line, the temperature distribution over the entire surface of the glass sheet, the bending speed of the glass sheet during forming, the final bending angle, etc., it is preferable to control the energization time. The control factors include a number of parameters such as
In addition, since the temperature distribution on the entire surface of the plate glass changes with time, the temperature control is preferably performed by computer control. Usually, for several seconds to five minutes, especially for one to three minutes, the bending line length of 10 cm to several tens to several 1
A heating of 00 W is possible, which is sufficient (in the conventional bent glass manufacturing method, heating took 20 minutes).

By the above heating method, the bent line portion drawn on the plate glass is heated to a predetermined temperature. The temperature is
The temperature of the plate glass of the bent line portion is equal to or higher than the softening point of the used plate glass, and particularly preferably in the range of the softening point to the softening point plus 140 ° C. When the temperature exceeds the above range, the flat portion near the bending line after bending is distorted, and it is not preferable from the economical viewpoint. Here, the softening point of the glass sheet corresponds to a temperature at which the glass has a viscosity of about 10 ⁸ poise and is deformed by its own weight (normal float glass has a temperature of about 740 ° C.).

Further, in order to achieve the above method for producing a bent glass plate more preferably, the two-dimensional internal stress is temporarily generated in the glass plate due to the non-uniform temperature distribution generated by the heating of the bent line portion. It is necessary to prevent damage to the glass sheet. In this method, it is preferable to use the heating method described below in combination in order to control the edge tension to be equal to or lower than the breaking strength.

That is, it is preferable to radiatively heat the plate glass near the bending line. The radiant heating is preferably performed using a sheath heater or a halogen lamp.
For example, a rod-shaped sheathed heater having a diameter of 15 mm is installed in parallel with the bending line at a position about 40 mm away from the bending line in a direction perpendicular to the plate glass surface. Further, it is preferable to radiantly heat and / or heat transfer heat the entire plate glass. The heat transfer heating is preferably performed by sandwiching a portion other than the vicinity of the bending line of the plate glass with a heating plate. For example, heating is performed by bringing a flexible heater for heat transfer into contact with both surfaces of the glass, and sandwiching the flexible heater on the glass surface with a heat insulating material placed thereon.

By the heating as described above, preferably, the temperature of the plate glass portion in the range of 3 cm or more on the right and left sides from the above-mentioned bending line is set to a temperature lower than the softening point of the used plate glass by 200 to 500 ° C. From the right-hand side to the glass plate portion in the range of less than 3 cm (for example, 2 cm may be left and right) at a temperature higher than that of the glass plate portion in the range of 3 cm or more, and the plate glass of the bending line portion is at a softening point of the glass plate or more. The temperature.
More preferably, a temperature gradient is provided between the fold line and the peripheral edge facing it. For example, a plate glass portion within 5 cm from the peripheral portion in the direction of the bending line is set to a temperature 400 to 500 ° C. lower than the softening point of the plate glass, and a peripheral portion facing the bending line at 3 cm or more in each of the right and left in the direction perpendicular to the bending line. Therefore, the temperature of the plate glass portion in the range exceeding 5 cm in the folding line direction is set to the temperature of the peripheral portion or more.

FIG. 2 shows an example of the temperature distribution on the glass sheet achieved by the above method for producing a bent glass sheet.
In the figure, plate glass G has a length of 400 mm and a width of 800 m.
m, the thickness is 4 mm, and the softening point is 740 ° C. A folding line L is drawn in the center of the plate glass in the horizontal direction. When this is heated according to the method of the invention, the temperature distribution of the glass along the line XX 'is shown in the figure. The position p on the plate glass G is also indicated by p on the temperature distribution. Line X
In the temperature distribution along X ′, the range of about 6 mm on each of the left and right sides of the bending line L is near 800 ° C. At the radiantly heated portion on the outer side, the temperature sharply drops between the bending line L and 2.5 cm. About 450 at the point p, which is about 10 cm from the fold line L
The temperature is almost constant up to the peripheral portion. That is, in order to maintain the flatness of the glass near the fold line, the temperature distribution in the vicinity of the fold line L was made extremely sharp, but the temperature distribution of the entire glass plate was appropriately controlled to break the glass. Can be prevented.

In addition to the above temperature distribution in the direction perpendicular to the bending line, also in the direction parallel to the bending line,
It is preferable (but not essential) to provide a given temperature distribution. That is, in the temperature distribution of the plate glass in a direction parallel to the bending line at each of 10 cm on the right and left sides in the direction perpendicular to the bending line, the temperature of the peripheral portion of the plate glass is 30 to 150 ° C. higher than the temperature of the central plate glass, preferably 50. It is preferable to set the temperature higher by -100 ° C. By achieving the temperature distribution, it is possible to more preferably prevent breakage of the plate glass due to the two-dimensional internal stress. The predetermined temperature distribution parallel to such a bending line is
This can be achieved by radiant heating and / or heat transfer heating for heating the peripheral portion.

FIG. 3 shows an example of the temperature distribution given the temperature distribution in the direction parallel to the bending line. In the figure, the plate glass G ₁ is the same as the plate glass of FIG. When this is heated according to the method described above, the temperature distribution of the glass along the line X ₁ X ₁ ′ and the temperature distribution of the glass along the line Y ₁ Y ₁ ′ are shown in the figure. Position p ₁ on the glass sheet G ₁ is also shown by p ₁ on two of the temperature distribution. Line X ₁ X
In the temperature distribution along the ₁ ', the range of about 6mm respective left and right fold lines L ₁ has become close to 800 ° C., the temperature further proceeds to the peripheral direction is somewhat moderately low. The temperature is about 350 ° C. at a point p ₁ located about 10 cm from the bending line L ₁ . From there, the temperature drops more slowly, around 250 ° C at the periphery. On the other hand, the line Y ₁ Y ₁ ′
In the temperature distribution along, the temperature of the peripheral portion is higher than that of the central portion, which is important for preventing the glass from cracking due to two-dimensional stress. That is, in order to maintain the flatness of the glass near the fold line, the temperature distribution in the fold line L ₁ is made extremely sharp, but the temperature distribution of the entire glass plate is appropriately controlled to break the glass. Is preferable because it can prevent In the embodiment of FIG. 3, the total amount of heat for heating the glass plate is smaller than that of FIG.

The above-mentioned heating in the method for producing the above-mentioned bent flat glass is usually performed in the air, but it is not limited to this.

In the method for producing the bent flat glass, preferably, the whole flat glass is subjected to radiant heating and / or heat transfer heating, and then the flat glass portion in the vicinity of the bent line is radiantly heated, followed by the bent line portion. It is preferable to electrically heat the glass. By heating in this order, it is possible to easily achieve a temperature distribution having an appropriate peak in the bent line portion.

In the method for producing the above-mentioned bent flat glass, the method of bending the flat flat glass at a predetermined angle along the folding line is usually carried out by an appropriately designed flat glass holding mechanism. At that time, the bending speed, the bending external force and the final bending angle are precisely controlled through the holding mechanism. This prevents the occurrence of cracks in the bent portion, and makes it possible to obtain a predetermined cross-sectional shape and wall thickness of the bent portion. When radiant heating and / or heat transfer heating is used for the flat portion, it is preferable to provide a plate glass holding mechanism in the apparatus used for the heating and bend the plate glass at a predetermined angle by the glass holding mechanism. As the plate glass holding mechanism, for example, a flexible heater for heat transfer is brought into contact with both sides of the glass, a heat insulating material is placed thereon, and further, a plate attached to the arm is sandwiched and sandwiched between the plates, An example is a device that bends a plate glass at a predetermined angle by moving an arm by power. This allows
The interior angle between two adjacent planes is preferably 60 to 160 degrees. The bending operation can be completed within a very short time, and usually 1 to 5 minutes is preferable.

The conductive material having the above-mentioned bending line is
Usually, it is removed after the above thermoforming. Many of the components of the conductive material gradually burn or scatter during heating, and may remain little after the completion of molding. From this point, a carbon-based conductive paint is preferable. Depending on the type of conductive material or the thickness thereof, it may remain completely on the glass surface due to complete burning. In such a case, oxygen can be blown and completely burned to be removed after the heat molding, or the glass can be removed by an appropriate mechanical method or chemical method such as polishing after cooling. Further, from a design point of view, when it is desired to leave a line made of a conductive material in the completed plate glass structure, a conductive material having a predetermined composition that gives a desired color tone is used in advance. You can draw folding lines.

The glass after the heat-molding is post-treated in the same manner as in the conventional case, and can be subjected to, for example, slow cooling or rapid cooling to obtain a slowly cooled product, a strengthened product or a double strengthened product. Also a heat ray reflective coat,
Various surface treatments such as anti-reflection coating, printing of a specific pattern, and etching of the surface can also be performed.

A sheet of glass composed of a plurality of flat portions having at least one linear bent portion produced by the method for producing a bent sheet glass described above,
The radius of curvature of the outer periphery of the curved surface in the direction perpendicular to the bent portion is 1 to 4 times the thickness of the flat glass in the flat portion,
It is preferably 1 to 3 times. If the radius of curvature exceeds four times the thickness of the glass sheet, the distortion of the see-through object becomes large at the bent portion, which is not preferable, and if it is significant, the see-through object looks enlarged. On the other hand, if the radius of curvature is less than 1 times, the strength of the corner portion is small, and it is not preferable in terms of safety for humans. Further, a transition region which is slightly deformed and loses flatness may be present between the bent portion and the plane portion, and the width of the transition region is preferably twice the thickness of the glass sheet or less, and particularly, It is preferably 1 time or less. If the width exceeds twice, the object seen through in the plane portion near the bent portion is distorted, which is not preferable. The flat glass surface of the flat glass is substantially flat. For example, in the case of a plate glass structure using a float plate glass, the flatness of the float plate glass before bending is maintained as it is.

FIG. 1 shows an example of a cross section of the bent portion of the bent plate glass in the bending direction. R in the figure is the radius of curvature according to the present invention. Points P and Q are the points where the curved surface begins. Outside the bending points P and Q of the plate glass of the present invention, there is a transitional region S, which is relatively flat in appearance but relatively deformed to impair the flatness, that is, a region having relatively poor optical characteristics. Good. In the case of a conventional flat glass having a bent portion, FIG.
As shown in, the transition radius is extremely large, the boundary between the flat part and the bent part is not clear, and there is a transition region in the middle from the flat part to the bent part that is slightly deformed and impairs the flatness. Exists over length. In comparison, the glazings of the present invention are significantly different.

The above-mentioned plate glass refers to one having at least one corner portion, and examples thereof include various kinds as shown in FIG.

The flat glass structure of the present invention comprises the above-mentioned bent flat glass, that is, a plurality of flat portions having at least one linear bent portion, and has a radius of curvature of the outer circumference of the curved surface in a direction perpendicular to the bent portion. Two or more, preferably two or three, plate glasses which are substantially equal to each other are fixed at a predetermined interval by using a spacer and a means for filling the gap between the plate glass and the spacer.

In the glazing structure, the glazings are preferably fixed substantially parallel to each other, and the distance between them is preferably 3 to 60 mm, more preferably 3 to 30 mm, and particularly preferably. 4 to 2
It is 4 mm. The interval between the plate glasses refers to the interval between the flat surface portions adjacent to each other and facing each other.

An example of the plate glass structure of the present invention is shown in FIG. In addition, the cross-sectional view in the drawing shows a cross section of the yellow or hani portion of the plate glass structure. The thickness of both the outer glass sheet 2 and the inner glass sheet 1 is 4 mm, and the distance between the flat portions is 6 mm. The length of the side parallel to the linearly bent portion of the outer glass is 400 mm, and the length of the side perpendicular to the bent portion is 400 mm. The outer glass plate and the inner glass plate are separated from each other by a spacer 3 having a width required to secure the space between the glass plates along the peripheral edge thereof. The spacer may be any spacer as long as it allows plate glass to be placed at regular intervals. Preferable examples are hollow quadrangular prisms made of metal such as aluminum, mild steel, stainless steel or the like, or plastic or the like as shown in the figure. As shown in the cross-sectional view, the two sheets of glass are filled with a sealing material 6 such as butyl rubber and a caulking material 5 such as silicone rubber or polysulfide synthetic rubber through the spacers. Means for filling the gap between the plate glass and the spacer may be any known means other than the above. For example, an apparatus or the like including a fastening member that mechanically fixes the plate glass to the spacer itself can be cited. Further, it is preferable that the spacer 3 is filled with the desiccant 4 in whole or in part. As the desiccant, for example, silica gel, molecular sieve or the like is used. The sealing material 6 prevents moisture from entering between the two sealed flat surfaces and prevents the glass from being fogged by the moisture between the sealed two flat surfaces. Further, the desiccant 4 prevents the glass from being fogged due to an extremely small amount of water that has entered between the two sealed planes during assembly. The plate glass structure of the present invention can be installed by housing the joint portion of the plate glass peripheral portion in a frame such as a window frame and fixing the frame.

The plate glass structure has the same features as the bent plate glass described above. Therefore, each sheet glass constituting the sheet glass structure has extremely good flatness up to a very sharp bent portion and the vicinity of the bent portion, and the transparency of the sheet glass structure of the present invention made of such sheet glass is very high. Is excellent.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

[0035]

Example 1 400 mm long, 800 mm wide, 4 mm thick
Of a rectangular float glass plate (soda lime glass, softening point 740 ° C.) in the horizontal center and in the vertical direction using a silver-based conductive material (trademark D-1230 (modified), Fujikura Kasei Co., Ltd.) A folding line having a width of 2 mm and a thickness of 20 μm was drawn on one surface and both end surfaces of the plate glass by using a screen printing method. A solid electrode was placed at the end of the fold line. Then, a rod-shaped sheathed heater having a diameter of 15 mm was placed parallel to the bending line at a position 40 mm away from the bending line in the direction perpendicular to the plate glass surface. In addition, the heat transfer heating device consisting of a flexible heater is placed on the left and right 5
The plate was placed over the entire surface of the plate glass, leaving the cm. The heat transfer heating device is installed so as to sandwich the plate glass from both sides, and functions as a plate glass holding mechanism. Next, first, heat transfer heating is started to heat the whole plate glass to 450 ° C.,
Radiant heating near the fold line, then 50
A current of Hz and AC38V was applied for 2 minutes to heat the plate glass of the bent line portion to 800 ° C. The plate glass surface had the predetermined temperature distribution shown in FIG. Then, the plate glass was bent by the plate glass holding mechanism in such a manner that the two flat surfaces were perpendicular to each other in about 1 minute. After shaping in this way, it was slowly cooled to produce a bent sheet glass.

The radius of curvature of the outer circumference of the curved surface in the direction perpendicular to the bent portion of the manufactured sheet glass is 1.2 times the thickness of the sheet glass in the flat portion, which is 5 mm, and is slightly deformed to lose flatness. Almost no transition region was observed.
Further, the flat portion of the bent sheet glass maintained the original flatness of the float sheet glass used in the method of the present invention, and no increase in optical perspective distortion and reflection distortion was observed.

The two bent glass plates thus produced were stacked with each other through a hollow quadrangular columnar spacer made of aluminum so that the distance between the flat portions was 6 mm. The entire hollow portion of the spacer was filled with silica gel as a desiccant. Further, butyl rubber as a sealing material is filled between the flat glass surface and the spacer, and silicone rubber as a caulking material is filled between the flat glass on the surface facing the outside of the spacer to manufacture a flat glass structure similar to that shown in FIG. did.

The flat glass structure thus produced had very sharp bent portions and had no distortion in its flat portion and had excellent transparency. In addition, even after long-term use, there was no clouding due to water in the space partitioned by the two glass plates.

..

Industrial Applicability According to the present invention, two or more flat glass sheets, each of which is composed of a plurality of flat portions having straight bent portions and whose curvature radii of the outer circumference of the curved surface in the direction perpendicular to the bent portions are substantially equal, are arranged at predetermined intervals. A fixed plate glass structure is provided.

[Brief description of drawings]

FIG. 1 is an example of a cross-sectional view in a bending direction of a bent portion of a plate glass forming a plate glass structure of the present invention.

FIG. 2 is an example of the temperature distribution on the glass sheet achieved by the method for producing a glass sheet constituting the glass sheet structure of the present invention.

FIG. 3 is an example of the temperature distribution on the glass sheet achieved by the method for producing the glass sheet constituting the glass sheet structure of the present invention.

FIG. 4 is an example of a plate glass constituting a plate glass structure of the present invention.

FIG. 5 is an example of the flat glass structure of the present invention.

FIG. 6 is an example of a cross-sectional view in the bending direction of plate glass structures that are joined together by a frame.

FIG. 7 is an example of a cross-sectional view in the bending direction of a bent sheet glass manufactured by a conventional method.

[Explanation of symbols]

R: radius of curvature of the outer periphery of the curved surface in a direction perpendicular to the bent portion S: transition region P, Q: starting point of bent portion d: thickness of sheet glass G, G ₁ : sheet glass L, L ₁ : bending line A ₁ , a _2: planar portion AB _1, AB _2: planar portion a _1, a transition of a ₂ and the bending portion B ₁ region B _1: bending portion 1, 1a: the inner glass sheet 2, 2a: outer plate glass 3, 3a: spacer 4, 4a: Desiccant 5, 5a: Caulking material 6, 6a: Sealing material 7: Joint between inner and outer glass sheets 7a: Caulking material and sealing material 8a: Frame

Claims (7)

[Claims] 1. A plate glass structure comprising two or more plate glasses, a spacer for defining a space between the plate glasses at a peripheral portion of the plate glass, and a means for filling a gap between the plate glasses, wherein each of the plate glasses is at least one. Composed of a plurality of flat portions having linear bent portions, the radius of curvature of the outer periphery of the curved surface in the direction perpendicular to the bent portions is 1 to 4 times the thickness of the flat glass in the flat portions,
A plate glass structure in which the plate glass surface of the flat portion is substantially flat and the above-mentioned radii of curvature are substantially equal to each other. 2. The plate glass structure according to claim 1, wherein the radius of curvature is 1 to 3 times the thickness of the plate glass in the flat portion. 3. A transition region in which the flat glass is slightly deformed and loses flatness is present between the bent portion and the flat portion, and the width of the transition region is not more than twice the thickness of the flat glass. The plate glass structure according to claim 1 or 2, characterized in that. 4. The width of the transition region is 1 of the thickness of the glass sheet.
The flat glass structure according to claim 3, wherein the flat glass structure has a double or less. 5. The plate glass structure according to claim 1, wherein the plate glasses are substantially parallel to each other. 6. The plate glass structure according to claim 1, wherein a distance between the plate glasses is 3 to 60 mm. 7. The sheet glass structure according to claim 1, wherein in each sheet glass, an interior angle between two planes adjacent to each other through the bent portion is 60 to 160 degrees.