JPH03271132A - Glass sheet - Google Patents

Abstract

PURPOSE:To enable inexpensive production of thin sheet glass having large mechanical strength by arranging carbon fiber having flat orientation face in the interior of glass and the vicinity of surface and rear face along each face. CONSTITUTION:The aimed glass sheet in which carbon fiber having flat orientation face is arranged in the interior of glass along the vicinity of the surface and rear face of glass. For example, in the glass sheet 23, stitches are formed by carbon fibers 7 in stretching direction (Y direction) and carbon fibers 27 in X direction. When light is incident on the glass 8 having 0.2-1mm (e.g. 0.5mm) thickness from 30 direction, light is not transmitted through the glass, because the carbon fiber is black. Therefore, area (total area) occupied by the carbon fiber is preferably kept to <=1% based on total area, viewed from 30 side. When carbon fiber consisting of a raw yarn having 10mu diameter or obtained by twisting 10-3X10<3> raw yarns and having diameter of <=100mu difficult to observe by the naked eyes is applied to the glass, aimed glass sheet can have high quality.

Description

[Detailed description of the invention]

[0001]

[Industrial application field]

This invention relates to a glass plate containing carbon fibers. [0002]

[Prior art and problems to be solved by the invention] Conventionally,
A float method and the like are known as methods for producing glass plates. This involves melting and floating soda glass on a tin bath.
Thick plate or thin plate glass is produced by rolling this molten glass. However, although this float method has the feature of being able to make the surface extremely flat, it is extremely unsuitable for producing thin plates of 2 mm or less, particularly 0.5 mm or less. [0003] Therefore, for thin glass sheets of 2 mm or less, for example, 0.5 mm, an extra roll rolling process is required to thin and reduce the amount of glass material, which has the disadvantage that the manufacturing price increases. Ta. [0004] Furthermore, when tempered glass is chemically strengthened, a new process such as chemical strengthening such as potassium replacement is required for the formed glass plate, or air cooling strengthening is required for a glass plate having 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 a concept 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 is a glass plate having a thickness of 2 mm or less, preferably 0.5 mm or less, and which does not contain carbon fibers. The purpose is to have mechanical breaking strength twice or more than that of the substrate glass plate. [0008] [Means for Solving the Problems] The present invention relates to the production of a thin glass plate, and instead of producing it by rolling molten glass with a roll, using carbon fiber with a heat-resistant thin wire as a core, The present invention relates to a method of drawing out the thin carbon fibers from within the molten glass 1 and attaching the molten glass to the carbon fibers and the gaps between the carbon fibers to form a glass plate. [0009] As described above, the present invention aims to produce thin glass at low cost by using the "drawing method" (the pulling method is shown in FIG. 1). [0010] In this invention, planar carbon fibers are separated for a certain period of time and oriented in pairs, and molten glass is filled between the surfaces of the carbon fibers, thereby forming carbon fibers near the front and back surfaces of a manufactured glass plate. This invention relates to a method for producing tempered glass by orienting and embedding. [0011] The purpose is to produce a glass plate having mechanical strength similar to that of chemically strengthened glass by orienting carbon fibers in a planar manner near (within approximately 50 μm) the front and back surfaces. [0012] That is, carbon fibers having a planar orientation surface are immersed (dipped) in molten glass 1 and pulled up, and 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, the method of the present invention is characterized in that it is easier to produce a glass plate with a thinner thickness, and even a glass plate with a thickness of 2 mm or less, for example, 0.2 mm, can be produced. [0014] 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. sandwich the glass between rolls,
It is also possible to modify it. 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 with a thickness of 1 to 3 mm. It is also possible to make a plate (of course, a thin plate of 0.2 to 1 mm is 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 are oxidized and vaporized in a non-oxidizing atmosphere even at high temperatures of 100 to 1500°C, and their tensile strength does not decrease. For this reason, the melting furnace is filled with an inert gas such as nitrogen or argon. Of course, the surface of the carbon fiber is coated with a silicon nitride film in advance to a thickness of 100 to 1000 layers using a plasma vapor phase method or a hot vapor phase method to react with silane and ammonia.
Furthermore, it is effective to prevent oxidation and strengthen heat resistance.

[O○17] Examples are 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 (2o) is made of firebrick (4), heater (6),
It consists of a container (5) for molten glass. The container (5) is filled with molten glass (15). Raw materials for the glass are introduced continuously from (22). [0019] The carbon fibers are pulled up through rolls (11) and (13). An Asia star (31) for controlling thickness determines the gap between the pair of carbon fibers. The presence or absence of this 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. [00201] Then, the glass (8) is attached between the carbon fibers (7), (7), and on the front and back surfaces. Rough cooling section (2
2) and is lifted upward through a roll (21) for controlling the thickness and surface condition (pattern). [0021] In order to make the atmosphere an inert gas, nitrogen is supplied from (3) and discharged to the outside from (18). Deoxidizing the inert gas on the exhaust side of (18) and making it return to (3) was effective for energy conservation. [0022] The carbonized fibers attached to the glass are removed by pulling rolls (14
), (19) and is lifted upward. The glass plate (23) is cut into a predetermined shape by a laser beam (17) from a light emitter (YAG laser) (16). [0023] In this manner, it has become possible to impregnate carbon fiber and produce a reinforced glass plate. [0024] This figure 1 shows a pair (two sides) of carbon fibers (7), (7
), but it goes without saying that it is also possible to provide only one page. [0025] The furnace (20) has a tank (5) filled with glass (15) to be melted, and the tank (5) is surrounded by refractory bricks (4),
It is heated and maintained at 1100 to 1500°C by a heater (6), and it is extremely important that the temperature range be accurate, for example, 1200°C±10°C. The pulling speed can be from 5 to 50 m/min, and the width can be controlled within 5 m depending on the size of the furnace (20). Generally 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. Figure 2 (A) shows the carbon fiber (7
) (referred to as the Y direction) and carbon fibers (27) in the X direction. Glass (8) is 0.2-1mm
For example, when the carbon fiber is 0.5 mm and light is incident from the direction (30) in the drawing, the carbon fiber is black and does not transmit light. Therefore, the area occupied by carbon fiber (total area)
is preferably 1% or less of the total when viewed from the (30) side. For this reason, carbon fiber is a raw yarn of 10 μφ or 1
When carbon fibers made of 0 to 3 x 103 pieces were used with a thickness of 100 μm or less, which is difficult to see with the naked eye, high quality could be achieved. [0027] FIG. 2(B) shows the warp (X direction) carbon fibers (7),
(7'), and the gap (28) is, for example, 1.5
This is the case when it has mm. Of course (28) is 0.02
~2 mm, for example 0.3 mm is also possible. By creating such a laminated structure, even if mechanical strength is applied to one side of the glass plate, the tensile strength of the carbon fiber on the other side prevents the glass from "breaking," resulting in chemically strengthened glass. We were able to create a glass plate with similar wind pressure resistance. [0028] FIG. 2(C) shows, in addition to FIG. 2(A), carbon fiber chip short fibers (29) (3 to 10 mm) dispersed therein. These short fibers (29) are extremely thin, approximately 10μφ, and cannot be seen with the naked eye, so there is no practical problem in embedding them, and these short fibers can prevent damage to the glass plate. Ta. [0029] (D) is a combination of FIGS. 2 (B) and (C). [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. This made it possible to create a semi-hard glass plate with a radius of curvature of 3 m or less even when bent by 2 to 0.5 mm, making it possible for the first time to manufacture lightweight, tempered glass. Furthermore, in FIGS. 2(C) and (D),
By impregnating short fibers (5 to 10 mm long, approximately 1010 μφ), a thin ceramic film such as silicon nitride or silicon carbide film ((300 to 3
By coating (average thickness of 000A), it was possible to simultaneously improve oxidation resistance, heat resistance, and 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]

【Effect 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 lowered by more than 80% compared to conventional methods, and the manufacturing cost of thin glass sheets with a thickness of 0.8 mm or less can be lowered by more than 80%, making its contribution to the industry more favorable than manufacturing methods for thin glass sheets that require an extra rolling process. It was huge. [0033] Also, in FIG. 1, the furnace heater is an external heating type, but
It is effective to further save energy by using an internal heating type. [0034] Furthermore, the carbon fiber-containing glass plate of the present invention did not scatter even if broken, which was preferable from a safety standpoint. In addition, conventionally known metal wired glass for safety requires an extra process to insert the mesh, but the pulling 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 pull it down. The novelty of the method of the present invention lies in that the glass plate is fabricated using a heat-resistant insulator, particularly carbon fiber, as a core.

[Brief explanation of drawings]

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

[Figure 2] 1 shows a longitudinal cross-sectional view of 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 Light incident direction Attach glass to this core.

【Document name】

figure surface

[Figure 1] I will

[Figure 2] (A (B)

[Document name]　　　　　　　　　　　Procedural amendment document

[Submission date] January 11, 1991

【address】
Commissioner of the Patent Office (Examiner of the Patent Office)

[Display of incident] 【Filing date】 【Reference number】 [Name of the invention] [Person making the correction]

[Relationship with the case] Patent applicant

[Identification number 1 00015387B [Postal code] 2
43

[Address or Residence] 398 Hasaya, Atsugi, Kanagawa Prefecture

[Name or Name] Semiconductor Energy Research Institute Co., Ltd.

[Representative] Maiko Yamazaki

[Number of claims increased due to amendment]

[Procedural amendment 1]

[Name of document to be corrected] [Correction target item name] [Correction method] [Contents of correction]

[Procedural amendment 2]

[Name of document to be corrected] [Correction target item name] [Correction method] [Contents of correction]

Patent application filed on December 15, 1990 POO1780-01 glass plate Specification Claims column addition Specification Paragraph number 0030 change

[Claims column]

1. A glass plate patented in which 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.

As is clear from the above description, the method of the present invention is characterized in that it can produce thin glass compared to the conventional method, and has greater mechanical strength. Therefore, even with bending of 0.2 to 0.6 mm, the radius of curvature is 3.
This made it possible to create a semi-hard glass plate with a hardness of less than m, making it possible for the first time to manufacture lightweight, tempered glass. Furthermore, in (C) and (D), by infiltrating short fibers (5 to 10 mm long, approximately 100 mm thick), a ceramic film such as silicon nitride or silicon carbide is further applied to the surface of these fibers. Thin <(300~3000
By applying the coating (average thickness of A), it was possible to simultaneously prevent oxidation, improve heat resistance, and improve adhesion to glass.

Claims (1)

[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.