JPH0451503B2 - - Google Patents

Description

[Detailed description of the invention]

[0001]

TECHNICAL FIELD This invention relates to a glass plate containing carbon fibers.

[0002]

[Prior art and problems to be solved by the invention]
2. Description of the Related Art Conventionally, a float method and the like have been known as methods for producing glass plates. In this process, soda glass is melted and floated on a tin bath, and the molten glass is rolled to produce thick or thin glass. However, although this float method has the characteristic of making the surface extremely flat, it
In particular, it was extremely unsuitable for making thin plates of 0.5 mm or less.

[0003] Therefore, for example, thin glass of 2 mm or less
0.5 mm had the disadvantage that an extra roll rolling process was required to reduce the thickness of the glass material, which conversely increased the manufacturing price.

[0004] Furthermore, when tempered glass is chemically strengthened,
The formed glass plate required a new process, such as chemical strengthening such as potassium substitution, or air-cooling strengthening for glass plates with a thickness of 3 mm or more.

[0005] Therefore, tempered glass has the disadvantage that it is thicker than ordinary glass and is also more expensive.

[0006] The present invention is based on an idea completely opposite to these conventional methods, and relates to a method for manufacturing thin glass at low cost by eliminating the drawbacks of the conventional methods.

[0007] The present invention is completely different in concept from conventional tempered glass, and has a thickness of 2 mm or less, preferably
It is a glass plate having a thickness of 0.5 mm or less, and is intended to have mechanical breaking strength twice or more as compared to a known substrate glass plate that does not contain carbon fibers.

[0008]

[Means for Solving the Problems] The present invention relates to the production of a reinforced glass plate, and instead of producing it by rolling molten glass with a roll, it uses carbon fiber with a heat-resistant thin wire as a core, and uses this thin wire as a core. The present invention relates to a method of making a glass plate by drawing out certain carbon fibers from a molten glass vessel and depositing molten glass into the carbon fibers and the gaps between the carbon fibers.

[0009] The present invention is thus a "drawing method"
(The pulling method is shown in FIG. 1) to produce thin glass at low cost.

[0010] In this invention, carbon fibers are separated from each other for a certain period of time and oriented in pairs, and molten glass is filled between the surfaces of the carbon fibers, so that carbon fibers are formed near the front and back surfaces of the produced glass plate. This invention relates to a method for producing tempered glass by orienting and embedding.

[0011] The purpose is to create a glass plate having mechanical strength similar to that of chemically strengthened glass by orienting carbon fibers in a plane near the front and back surfaces (within about 50μ).

[0012] That is, carbon fibers having a planar orientation surface are immersed in a molten glass vessel (dip), and by pulling this up, the molten glass is attached to the carbon fibers using the surface tension of the glass, and solidified. By doing so, it is intended to produce a glass substrate in which carbon fibers are embedded.

[0013] Therefore, in the method of the present invention, it is easier to make a glass plate with a thinner thickness, and it is less than 2 mm, for example, 0.2 mm.
It has the characteristic that it can be manufactured even with a thickness of .

Furthermore, in the method of the present invention, the circumference and thickness of the surface are controlled by the speed of pulling and the temperature of the molten glass, but in order to finely control the smoothness and thickness to a constant value, It is also possible to repair the glass by sandwiching it between rolls. Therefore, another feature is that by inscribing various patterns (engraved with flower patterns, etc.) on this roll, it is possible to imprint the glass plate.

[0015] Furthermore, by arranging carbon fibers with a pair of planes and pulling them up, the distance between the pairs of carbon fiber planes can be controlled to create a relatively thick glass plate with a thickness of 1 to 3 mm. It is also possible to make (of course
Although thin plates of 0.2 to 1 mm are also possible). Furthermore, in terms of mass production, the present invention is extremely superior to conventional methods because the glass is simply pulled up, and can be said to be an inexpensive glass manufacturing method.

[0016] The present invention utilizes the characteristics of carbon fibers, which oxidize and vaporize in a non-oxidizing atmosphere even at high temperatures of 100 to 1500°C, and do not cause a decrease in tensile strength. For this reason, the melting furnace is filled with an inert gas such as nitrogen or argon. Of course, a silicon nitride film is preliminarily applied to the surface of the carbon fiber using the plasma vapor phase method or hot vapor phase method to react with silane and ammonia.
It is effective to apply a coating to a thickness of 100 to 1000 Å to further prevent oxidation and strengthen heat resistance.

[0017] Examples thereof will be shown below according to the drawings.

[0018]

EXAMPLE FIG. 1 shows an outline of a furnace for manufacturing a carbon fiber-impregnated glass plate used in the present invention. In the drawing, carbon fibers 1 are introduced into a melting furnace 20 through a roll 2 that isolates the outside air from the inside of the furnace. The melting furnace 20 is made up of refractory bricks 4, a heater 6, and a container 5 for molten glass. The container 5 is filled with molten glass 15. Raw materials for glass are continuously introduced at 22.

[0019] The carbon fiber is pulled up through rolls 11 and 13. The gap between the pair of carbon fibers is determined by the Asia star 31 for thickness control. The presence or absence of the Asia star 31 and its thickness determine whether the glass plate has two carbon fibers or one side, and also determines the thickness of the glass plate on the two sides.

[0020] Then, the glass 8 is attached between the carbon fibers 7, 7, and on the front and back surfaces. Furthermore, it passes through a roll 21 for controlling the thickness and surface condition (pattern) located in the slow cooling section 22 and is lifted upward.

[0021] In order to make the atmosphere an inert gas, nitrogen is supplied from 3 and released from 18 to the outside. 1
Deoxygenating the inert gas on the exhaust side of No. 8 and returning it to No. 3 was effective for energy saving.

[0022] The carbon fibers attached to the glass are lifted upward through lifting rolls 14 and 19. The glass plate 23 is a light emitter (YAG laser) 16
The laser beam 17 is used to cut into a predetermined shape.

[0023] In this manner, it has become possible to impregnate carbon fiber and produce a reinforced glass plate.

[0024] Although a pair (two surfaces) of carbon fibers 7, 7 are provided in FIG. 1, it goes without saying that only one surface may be provided.

[0025] In the furnace 20, a tank 5 is filled with glass 15 to be melted, and the tank 5 is surrounded by refractory bricks 4, and is heated and maintained at 1100 to 1500°C by a heater 6, and the temperature range is, for example, 1200°C ± It is extremely important to achieve a precision of 10°C. The pulling speed is possible from 5 to 50 m/min, and the width is
It is possible to control within 5m depending on the size of 0. In general, it is preferable to set the length to 10 cm to 2 m, for example 40 cm, from the viewpoint of manufacturing yield.

[0026] FIG. 2 is a longitudinal cross-sectional view of a glass plate made by the method of the present invention. In FIG. 2A, the carbon fibers 7 in the pulling direction (referred to as the Y direction) and the carbon fibers 27 in the X direction have a mesh shape. When the glass 8 is set to 0.2 to 1 mm, for example 0.5 mm, and light is incident from 30 directions in the drawing, the carbon fiber is black and does not transmit light. For this reason, it is preferable that the area (total area) occupied by carbon fibers be 1% or less of the total area when viewed from the 30 side. For this reason, carbon fibers are difficult to see with the naked eye in raw yarns of 10μφ or in carbon fibers made by twisting 10 to ³ x 103 yarns.
High quality could be achieved by using a thickness of 100μ or less.

[0027] In Fig. 2B, the carbon fibers 7, 7' of the warp (X direction) are oriented, and the gap 28 is, for example, 1.5
This is the case with mm. Of course 28 is 0.02~2
It is also possible to set it to mm, for example, 0.3 mm. By creating such a laminated structure, even if the mechanical strength is higher than that of one side of the glass plate, the tensile strength of the carbon fiber on the other side can prevent the glass from "breaking", resulting in chemically strengthened glass. We were able to create a glass plate with similar wind pressure resistance.

[0028] In addition to the structure shown in FIG. 2A, FIG. 2C shows a structure in which short carbon fiber chips 29 (3 to 10 mm) are dispersed. The short fibers 29 are extremely thin, about 10 μΦ, and cannot be seen with the naked eye, so there is no practical problem in embedding them, and the short fibers can now prevent the glass plate from breaking.

[0029] D is a combination of B and C in FIG.

[0030] As is clear from the above description, the method of the present invention has features in manufacturing thin glass, and has greater mechanical strength than conventional methods. For this reason 0.2-0.6
This made it possible to create a semi-hard glass plate with a radius of curvature of less than 3 m even when bent by mm, making it possible for the first time to manufacture lightweight, tempered glass. Furthermore, in Figures 2C and D, short fibers (5 to 10 mm long,
By infiltrating the surface of these fibers with a thin ceramic film of silicon nitride or silicon carbide (average thickness of 300 to 3000 Å)
By coating, we were able to simultaneously prevent oxidation, improve heat resistance, and improve adhesion to glass.

[0031] Furthermore, since the carbon fibers are formed in a net shape or a sag shape, it has another feature of being strong against impact strength.

[0032]

[Effects of the Invention] As is clear from the above explanation, since the manufacturing method of the present invention is completely different from that of the conventional method, the manufacturing cost can be reduced by 40%. In particular, manufacturing costs for thin glass sheets with a thickness of 0.8 mm or less can be reduced by more than 80% compared to conventional methods, and this makes a greater contribution to industry than the manufacturing method for thin sheet glass, which requires an extra rolling process. It was something like that.

[0033] Also, in Fig. 1, the furnace heater is an external heating type, but it is effective to use an internal heating type to further save energy.

[0034] Furthermore, the carbon fiber-containing glass plate of the present invention did not scatter even if broken, and was preferable from a safety standpoint. In addition, conventionally known safety glass with metal mesh requires an extra process to insert the mesh, but the lifting method of the present invention does not require any new process and can be made safely. It has other characteristics.

[0035] In the present invention, the pulling direction is upward. However, it is not impossible to pull it laterally or to pull it down. The novelty of the method of the present invention lies in that the glass plate is made using a heat-resistant insulator, particularly carbon fiber, as a core, and glass is adhered to this core.

[Brief explanation of drawings]

FIG. 1 shows a glass plate manufacturing apparatus for carrying out the method of the present invention.

FIG. 2 shows a longitudinal section through a glass plate made according to the invention.

[Explanation of symbols]

7...Carbon fiber 7'...Carbon fiber 8...Glass 23...Glass plate 28...Gap 29...Short fiber 30...Incidence direction of light.

Claims (3)

[Claims] 1. A glass plate characterized in that carbon fibers having planar orientation surfaces are arranged inside the glass near the front surface and near the back surface of the glass along each of the surfaces. 2. The glass plate according to claim 1, wherein the carbon fibers are formed into a wire mesh shape or a sag shape. [Claim 3] In Claim 1, the carbon fiber is
A glass plate characterized by being made of a raw thread of 10 μmφ or a combination of 10 to 3×10 ³ of these raw threads.