JPH04209727A - Production of figured glass - Google Patents

Abstract

PURPOSE:To provide the title production process so designed that a plate glass including recess-forming positions for patterning, is put on a sand mold made of silica sand followed by heating to the melting point of the plate glass or higher, thereby the sand mold can be reused and the regulation of the cooling rate can be freely made during annealing operation. CONSTITUTION:Alumina cement is kneaded with water to form a lower sand mold layer 1, and prior to its solidification, many penetrated holes 2 are made on said layer 1. Silica sand is then kneaded with sodium silicate and the product is laminated on said layer 1 to form a upper sand mold layer 3, thus forming a double layer 3. Then, a plate glass G is put on the upper sand mold layer. A sand mold A loaded with the plate glass G is then put on a truck 5, which is then moved into an oven 6, where heating is then made at temperatures not lower than the melting point of the plate glass G. Thereby, with the molten part of the plate glass G coming down into recesses 4, the flat surface of the plate glass G comes down into the recesses 4, thus manifesting a partial projected pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a shaped glass in which a pattern is applied to the surface of a flat glass plate.

[Prior Art] Conventionally, as a method for manufacturing a molded glass in which a pattern is applied to the surface of a flat glass plate, as disclosed in Japanese Patent Publication No. 1-42898, the lower sand mold layer is formed by mixing river sand and clay with water. A sand mold has been proposed in which the upper sand mold layer is formed by kneading sand and clay, which are finer than river sand, with water and has a double-layered top and bottom structure and a flat top surface.

When molded glass is manufactured using this conventional sand mold, after heating and melting, the glass is slowly cooled outside the furnace.

[Problems to be Solved by the Invention] However, once clay is heated, it solidifies and cannot be remolded.

Furthermore, when cooling outside the furnace, it is essential to cover the glass plate with a heat insulating material to avoid rapid cooling. For this reason, it was not possible to freely adjust the cooling rate at the stage of the slow cooling operation.

Therefore, an object of the present invention is to provide a method for producing molded glass that uses a sand mold that can be used again even if it has been used once, and that can freely adjust the cooling rate during the slow cooling operation. It is said that

[Means for Solving the Problems] In order to solve the above object, the present invention has a double-layer structure in which an upper sand mold layer formed of silica sand is stacked on a lower sand mold layer formed of alumina cement,
A sand mold with a flat top surface is constructed, and while this sand mold is sufficiently moist, a mold consisting of a recess of a desired shape and a volume sufficiently smaller than the volume of the plate glass is formed on the upper surface of the upper sand mold layer, and then , by placing a glass plate on top of the upper sand mold layer, placing it in a furnace as it is, and heating it in the furnace at a high temperature above the melting point of the glass, the molten part of the glass plate droops into the recess, forming a flat glass plate. The gist is to mold a partial bulging pattern on one side of the mold, and then slowly cool it in a furnace.

[Operation] In the present invention, a plate glass is used, and is placed on a sand mold including the concave portions for patterning, and then heated above its melting point, so that the molten portion of the plate glass is placed in the concave portions. By penetrating into the glass, a partially bulging pattern is formed on one side of the glass, while maintaining the flat overall shape of the glass plate.

Since the upper sand mold layer is formed of silica sand, the sand mold can be used again even if it has been used once, and since it is slowly cooled in the furnace, the cooling rate can be freely adjusted.

[Example] Hereinafter, a method for manufacturing a molded glass according to an example of the present invention will be described with reference to FIGS. 1 to 4.

First, the sand mold A shown in FIGS. 1 and 2 will be explained.

Alumina cement (trade name: Asahi Casta 13, main components: 5iOz 46%, AltOs 42%, other 12%) is kneaded with water to form the lower sand mold layer 1, and penetrates into the lower sand mold layer 1 before hardening. A large number of holes 2 are formed.

On top of this lower sand mold layer l, add silica sand (trade name Toyo Silica Sand No. 3 to No. 8, main component: 510 g) 96
．． 97%, A12031.36%, and others) are kneaded with sodium silicate and layered to form the upper sand mold layer 3, forming an upper and lower double layer. Alternatively, the upper sand mold layer 3 is formed by laminating silica sand and spraying sodium silicate onto the top surface to harden the surface. The upper surface of this upper sand mold layer 3 is made flat. Then, while the sand mold A is sufficiently moist, a recess 4 having a desired shape and having a volume sufficiently smaller than the volume of a glass plate G (described later) is formed on the upper surface of the upper sand mold layer 3.

Next, as shown in FIG. 3, a plate glass G is placed on the upper surface of the upper sand mold layer 3.

Then, as shown in FIG. 4, the sand mold A with the plate glass G placed thereon is placed on the trolley 5, and the trolley 5 is moved to be carried into the storage space 6.

Next, it is heated in Class 6 at a high temperature higher than the melting point of the plate glass G. As a result, as the molten portion of the glass plate G hangs down into the recess 4, the surface of the flat glass plate 20 changes into the recess 4 of the sand mold A.
It droops over time, forming a partial bulging pattern.

Finally, the molded glass is slowly cooled (50° C. or lower) in a Class 6 chamber, and then taken out of the furnace.

In this embodiment, since the upper sand mold layer 3 is formed of silica sand, even if the sand mold is used once, it can be used again.

In particular, in the case where the upper sand mold layer 3 is formed by laminating silica sand and spraying sodium silicate on the upper surface to harden the surface, it is easy to use it again because the upper surface is simply sprayed.

Further, since a large number of through holes 2 are formed in the lower sand mold layer 1, the heat in the layer 6 is easily conducted to the glass plate G in a good manner.

Furthermore, since the present embodiment performs slow cooling within Class 6, there is no need to cover the glass plate G with a heat insulating material to avoid rapid cooling as in the conventional case, and the cooling rate can be adjusted freely without the hassle of temperature adjustment. can be done.

Note that the present invention is not limited to the above embodiments,
Any changes may be made without departing from the spirit thereof.

[Effects of the Invention] As detailed above, the present invention has the advantage that even if the sand mold has been used once, it can be used again, and the cooling rate can be freely adjusted at the stage of the slow cooling operation. It has a great effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the sand mold, Fig. 2 is a perspective view thereof, and Fig. 3 is a perspective view showing a state in which a plate glass is placed on the top surface of the sand mold.
FIG. 4 is a perspective view showing a state in which plate glass placed on a sand mold is carried into the furnace. Lower sand mold layer 1, upper sand mold layer 3, recess 4, furnace 6, sand mold A,
Plate glass G0

Claims (1)

[Claims] 1. Lower sand mold layer formed with alumina cement (1)
Upper sand mold layer (3) formed with silica sand on top of
Sand mold (A
), and when this sand mold (A) is sufficiently moist, a recess (4) of a desired shape with a volume sufficiently smaller than the volume of the plate glass (G) is formed on the upper surface of the upper sand mold layer (3). A mold is formed, and then a plate glass (G) is placed on top of the upper sand mold layer (3) and put into the furnace (6).
) by heating at a high temperature above the melting point of glass.
A partial bulge pattern is formed on one side of the flat glass plate (G) as the molten portion of the glass plate (G) hangs down into the recess (4), and then it is slowly cooled in a furnace (6). A method for manufacturing patterned glass characterized by the following.