JPH066438U - Lower plate for bent glass and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a lower plate for firing bent glass used as a building material and a method for manufacturing the same. [Structure] Inorganic fiber 10 having an average fiber diameter of 5 μm or less
-40 wt% and a composition comprising an inorganic powder having a median particle diameter of 5 μm or less and the rest a clay mineral and an organic binder are kneaded, extruded and formed into a flat plate, and after drying, the support tools 2 are installed at both ends. Then, a curved plate-shaped lower plate for a bent plate glass and a method for producing the same are characterized in that creep deformation is performed at a high temperature of 1200 ° C. or higher to produce a curved sintered body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a lower plate for firing a bent plate glass used as a building material and a method for manufacturing the same.

[0002]

[Prior art and its problems]

 Conventionally, this type of lower plate for bent flat glass has been made of carbon, but it has the drawback that it can only be used in the return atmosphere and that foreign substances on its surface are transferred to the flat glass, leaving scratches. there were. Further, there is a drawback that a large size (500 mm × 500 mm or more) having a large specific gravity is very difficult to handle.

On the other hand, there are ceramics such as mullite and the like. In the manufacturing method, distortion occurs when the green molded body is dried, and the production cost such as machining becomes extremely high. However, due to the high density, there was a problem of poor handleability.

[0004]

[Means and actions for solving problems]

 The lower plate for bent plate glass according to the present invention needs to use inorganic fibers having an average fiber diameter of 5 μm or less. The reason for this is that if the average fiber diameter exceeds 5 μm, the dispersibility of the fibers during kneading and molding is poor, and a uniform curved surface cannot be obtained when creep deformation occurs during the firing process. Furthermore, it is necessary to add 10 to 40% of the fibers. The reason is that if it is less than 10%, the reinforcing property inside the molded body is insufficient, the density after firing becomes high, and creep destruction occurs in the firing process, while it exceeds 40%. This is because the sintering of the base material does not proceed and the strength deteriorates, and the handling property as a jig material deteriorates remarkably.

The inorganic fibers used in the present invention include silica-alumina fibers, alumina fibers, silica fibers and the like. Then, it is necessary to use an inorganic powder having a central particle diameter of 5 μm or less. The reason is that if it exceeds 5 μm, the sintered strength of the molded body cannot be obtained and the strength is remarkably deteriorated. Furthermore, it is necessary to add clay minerals and organic binders as the balance. The clay mineral is preferably a clay mineral having a layered structure, because it has a water retention property between layers, and therefore, it has a good effect on the shape retention after kneading and extrusion with an organic binder.

[0006] As for a method of performing extrusion deformation after extrusion molding, drying, installing supports at both ends, and performing creep deformation at a high temperature of 1200 ° C or more, the height of the supports is selected according to a desired curved surface of the molded body. . The reason for creeping at a temperature of 1200 ° C. or higher is that if the temperature is lower than that, the sinterability of the base material is insufficient and the strength is deteriorated, while the creep deformation is significantly reduced and a desired curved surface is obtained. This is because there is a problem of not having it. The present invention will be described with reference to examples.

[0007]

【Example】

 Example 1 25 wt% of silica-alumina fibers having an average fiber diameter of 2.0 μm and a central particle diameter of 1. Alumina powder of 0 μm [AMS-2: Sumitomo Chemical Co., Ltd.] 50% and the balance is Montmorillonite [Kunipia F: Kunimine Industry], Kibushi Clay [Toyotoku Kibushi: Kyoritsu Kiln Raw Material] and fiber treatment agent, for molding The composition comprising the binder is kneaded. After extruding the kneaded product, forming a flat plate with dimensions of 550 mm × 820 mm × 60 mm, soaking and drying at 80 ° C. for 24 hours, and installing supports having dimensions of 550 mm × 40 mm × 40 mm on both ends of the flat plate. Creep deformation is performed in an oxidizing atmosphere at 1500 ° C. (Creep amount is about 40 mm), and finally, the reinforcing body is attached to the lower part of the molded body. (See Figures 1-3)

When the lower plate for a bent glass plate of FIG. 3 was used at a deformation firing temperature of crystallized glass of 1000 ° C. (R1970), a uniform curved surface was obtained, and the surface property and handleability were good. For curved surfaces, select the dimensions of the lower plate, support, etc. and the heat treatment conditions for creep according to the dimensions of the bent sheet glass.

Comparative Example 1 45% silica-alumina fibers having an average fiber diameter of 6 μm, alumina powder [AMS-2: manufactured by Sumitomo Chemical Co., Ltd.] having a central particle diameter of 1.1 μm, and the balance of Kibushi clay [Toitoku Kibushi] : Kyoritsu Ceramic Raw Material], a fiber treating agent, and a molding binder were kneaded. The kneaded product was extruded, formed into a flat plate having dimensions of 550 mm × 820 mm × 60 mm, and subjected to soaking and drying at 80 ° C. for 24 hours. After that, a support tool having a size of 550 mm × 40 mm × 40 mm was installed on both ends of the flat plate, and then creep deformation was performed in an oxidizing atmosphere of 1500 ° C × 3 hr, but a uniform curved surface was not obtained and some cracks were generated. occured. (See Figure 4)

Comparative Example 2 Alumina fiber having an average fiber diameter of 3.0 μm [Denka Arcen 97N: manufactured by Denki Kagaku] 10% and alumina powder having a central particle size of 0.4 μm [AES-12: manufactured by Sumitomo Chemical] Then, a composition comprising montmorillonite [Kunipia F: manufactured by Kunimine Industries], Kibushi Clay [Toyotoku Kibushi: Kyoritsu kiln raw material], a fiber treatment agent, and a binder for molding was kneaded. The kneaded product was extruded and molded into a flat plate having a size of 550 mm × 820 mm × 60 mm, a support was installed in the same manner as in Comparative Example 1, and then firing was performed in an oxidizing atmosphere of 1100 ° C. × 6 hr. Creep deformation was extremely small (creep amount of about 5 mm), so it could not be used as a lower plate. (See Figure 5)

[0011]

[Effect of device]

 As described above, the present invention has the advantages that it can be used regardless of the firing atmosphere in the manufacturing process of bent plate glass, and that it is a lightweight product, so that it stores less heat and the firing cost is extremely low. In addition, since the surface property was improved, defects such as transfer of foreign matter to the bent plate glass were also reduced. In addition, even for large shapes that were difficult to achieve in the past, curved shapes can be produced without time-consuming and costly machining, resulting in significant cost reduction and productivity improvement.

[Brief description of drawings]

FIG. 1 is a top view and a side view of a bent plate glass molded body before creep deformation and a support in an example.

FIG. 2 is a side view of a bent plate glass molded body and a support tool after creep deformation in an example.

FIG. 3 is a side view of a lower plate for a bent plate glass and a reinforcing body in an example.

FIG. 4 is a side view of a bent plate glass molded body and a support in Comparative Example 1.

FIG. 5 is a side view of a bent plate glass molded body and a support in Comparative Example 2.

[Explanation of symbols]

1 molded body, 2 support (unbonded), 3 reinforcement (bonded)

Claims (1)

[Scope of utility model registration request] 1. A composition comprising 10 to 40 wt% of inorganic fibers having an average fiber diameter of 5 μm or less, an inorganic powder having a median particle diameter of 5 μm or less, and a balance of a clay mineral and an organic binder is kneaded and extruded, After forming a flat plate, after drying and installing supporters on both ends, at a high temperature of 1200 ° C. or higher,
A lower plate for a bent plate glass, which is characterized in that a curved sintered body is produced by creep deformation, and a manufacturing method thereof.