JPH0519306Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an apparatus for cooling a plate glass printed with ceramic paste after heating and bending the plate glass.

(Prior art) When bent and formed sheet glass is used as automobile window glass, a ceramic color is formed on the periphery of the sheet glass in order to hide the bond between the window frame and the sheet glass from the outside and improve the appearance. I have to. The ceramic color is formed by printing a ceramic paste on the periphery of the glass plate before heating the glass plate, and baking the ceramic paste using the heat generated when the glass plate is bent to form the ceramic color.

(Problem that the invention aims to solve) Ceramic paste absorbs heat rays more easily than glass, so the area where the ceramic paste is printed becomes hotter than other areas. In the process of cooling the sheet glass after bending, a temperature difference occurs between the periphery where the ceramic paste is printed and the center, and this temperature difference causes the periphery to shrink and warp more than the center. Become.

For this purpose, for example, as shown in FIG. 4, a ceramic paste is printed on the peripheral edge of an inner glass plate 100 of laminated glass, and a ceramic color 101 is formed using the heat of bending, and an outer glass plate 102 is bent using the same mold. Even if an attempt is made to pair it with the inner glass plate 100, a gap will occur.

Incidentally, not only laminated glass but also tempered glass has the disadvantage that bent glass with a ceramic color formed thereon and bent glass without it have different shapes even if they are bent and formed under the same conditions.

(Means for Solving the Problems) In order to solve the above problems, the present invention is to print ceramic paste on a plate glass, heat and bend it, and then, when cooling the plate glass, remove the ceramic color part from other parts. It was also strongly cooled.

(Function) By cooling the part of the ceramic collar that has become hot by absorbing heat rays during heating more strongly than other parts, it is possible to prevent warping caused by temperature differences.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a sectional view showing a horizontal type molding device to which a cooling device according to the present invention is applied, and shows a heating furnace 1.
On the downstream side, there is a ring mold 2 that supports the peripheral edge of the plate glass G from below, and this ring mold 2.
An upper mold 3 is disposed above so as to be freely movable up and down.

The upper mold 3 has a hollow shape, has a lower surface as a molding surface, and communicates the inside with an air source.Furthermore, near the periphery of the molding surface, there is a portion of a ceramic collar 4 formed on the periphery of the plate glass G. Nozzle holes 5 are formed to cool the area more strongly than other parts.

In the above, ceramic paste is printed on the peripheral edge of the plate glass G, and while the plate glass G is conveyed in the heating furnace 1 by rollers, the plate glass G is
Ceramic color 4 is obtained by heating the paste to near its softening point and firing the ceramic paste. Then, the plate glass G with the ceramic collar 4 formed thereon is placed on the ring mold 2 with the ceramic collar 4 part being hotter than the other parts.
Press molding is performed between the upper die 3 and the upper die 3.

After that, the upper mold 3 is raised, and cooling air is ejected from the nozzle hole 5 to cool the part that is hotter than the other part more strongly than the other part, and reduce the temperature difference between the peripheral part and the center part. Make it smaller. Note that sheet glass for laminated glass is not strengthened by rapid cooling, but is cooled naturally or at a rate close to this.

2 and 3 show a vertical cooling device. In the device shown in FIG. 2, a ceramic collar 4 of plate glass G is placed along the periphery of a hollow box 6 prepared separately from the mold. A nozzle 7 is provided to cool the part more strongly than other parts, and in the embodiment shown in FIG. are doing.

(Effect of the invention) As explained above, according to the invention, the part of the ceramic collar that has become hot due to absorbing more heat rays than other parts during the heating process can be cooled by cooling air from the nozzle hole or water cooling pipe. As the cooling process is strongly cooled to prevent large temperature differences from occurring locally during the cooling process, pairing can be performed accurately when manufacturing laminated glass, and plate glass printed with ceramic paste can be printed under the same conditions. There is no disadvantage such as increased bending even when the sheet glass is bent and formed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a molding apparatus to which a cooling device according to the present invention is applied, FIGS. 2 and 3 are cross-sectional views of another embodiment, and FIG. 4 is a view showing the problems of the conventional molding apparatus. In the drawings, 1 is a heating furnace, 4 is a ceramic collar, 5 is a nozzle hole, 7 is a nozzle, and 8 is a water cooling tube.

Claims (1)

[Scope of utility model registration request] In a device that cools a glass plate after bending and forming a glass plate that has a ceramic paste printed on a portion thereof, the cooling device is equipped with a means for cooling the ceramic colored portion formed by firing the ceramic paste more strongly than other portions. A cooling device for plate glass characterized by: