JPH0581534B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for producing glass products with colored streaks.

[Conventional technology]

Conventionally, as a technique for adding color streaks (color unevenness) to glass products, for example, as described in Japanese Patent Application Laid-open No. 190723/1983, a powdered general color frit was used as a coloring agent, and this was melted. A method has been proposed in which the glass gob is introduced into a glass substrate through a spout and then fed from an orifice at the bottom of the spout as a glass gob with colored streaks to a glass product forming machine. Color frits are literally colored frits,
In other words, it is the glass raw material itself containing coloring elements. Color frit used in glass products such as bottles is generally glass powder made by adding and melting coloring elements such as cobalt, chromium, and nickel.

[Problem to be solved by the invention]

However, when glass products with colored streaks are manufactured using such color frits, the following problems arise. If the expansion coefficients and viscosity at high temperatures of the color frit and the base glass substrate are not matched, there will be problems with the product's strength, such as distortion in the color streaks and thinning of the glass in those areas. Color frit easily diffuses into the glass base, making it difficult to form clear color streaks with deep colors and sharp edges. Since the color frit is in powder form and diffuses as soon as it is introduced, color streaks cannot be produced at desired positions on the glass product. Therefore, it is difficult to control the color streak pattern. Since the color frit is in powder form, a complicated mechanism is required for its input and quantitative measurement. An object of the present invention is to enable color streaks to be formed on glass products without such problems.

[Means to solve the problem]

In the method according to the present invention, glass powder is added to metal oxides such as cobalt oxide, copper oxide, nickel oxide, chromium oxide, manganese dioxide, etc. and sintered to form a sintered body in a predetermined shape such as a rod shape or a small piece shape. The colorant is sequentially added to the molten glass in the feeder and immersed in the molten glass, and the metal oxide is dissolved in the molten glass to form colored streaks.

[Effect]

The coloring agent used in the present invention is a product obtained by sintering metal oxides such as cobalt oxide, copper oxide, nickel oxide, chromium oxide, and manganese dioxide, so the metal oxides are dissolved and mixed directly into the molten glass. Since the glass is directly colored, it has good affinity for molten glass and can be clearly colored. Moreover, since the sintered body has a predetermined shape such as a rod shape or a small piece shape, it is easy to handle and position the colored area when adding colored streaks to the glass substrate. In addition, since glass powder is added to the metal oxide and sintered, the melting of the metal oxide in the sintered body is promoted and the color density can be increased. Furthermore, since such sintered bodies are added one after another and immersed in the molten glass in the feeder, the metal oxides are not immediately diffused but are gradually dissolved from the surface of the sintered bodies. The colored area can be easily adjusted by changing the immersion position of the sintered body, and the coloring concentration and range can be easily adjusted by changing the size and amount of the sintered body to be immersed.

【Example】

Next, examples of the present invention will be described. First, a sintered body to be used as a coloring agent is manufactured as follows. Depending on the desired color, choose from powdered cobalt oxide, copper oxide, nickel oxide, chromium oxide, or manganese dioxide.
Select a species or multiple species and add glass powder to it in a weight ratio.
Add at a ratio of 30% or less and mix thoroughly. This mixed powder is formed into a rectangular bar shape of 2 to 3 cm or a round bar shape of about 20 cm in diameter using a press molding machine, and then heated to about 900 to 1300° C. in an electric furnace and sintered.
If the sintering temperature is below 900°C, sufficient sintering may not be possible, and the sintered body will have low thermal shock resistance, and will be easily damaged when immersed in high-temperature molten glass as described below. Furthermore, at temperatures above 1300°C, the added glass powder will melt and flow out. It is preferable to use the glass powder made of the same material as the glass base on which the colored streaks are to be applied. FIG. 1 shows an example of a method for creating colored streaks in glass products such as bottles during the manufacturing process using such a sintered body. The molten glass (glass substrate) 2 in the feeder 1 flows from the floor hearth 3 of this feeder 1 to the spout 4 at the tip, falls from the glass outlet 5 provided in the spout 4 as a gob 6,
It is formed in a known manner by a glass forming machine (not shown). The rod-shaped sintered body 7 as described above is held in a holder 8, which is a rod-shaped brick body, for example, and immersed in the molten glass 2 within the front hearth 3. The holder 8 is an insertion opening 9 provided in the front hearth 3
the sintered body 7, and adjust the immersion height of the sintered body 7. For example, the sintered body 7 is held by passing through a horizontal hole 10 provided at the lower end of the holder 8 as shown in FIG. Immerse into molten glass 2. The metal oxide constituting the sintered body 7 immersed in the molten glass 2 gradually melts from the surface and mixes with the flow of the molten glass 2, forming color streaks in the molten glass 2. In this case, the glass contained in the sintered body 7 promotes the melting of the metal oxide, so if the amount added is increased, the amount of metal oxide eluted increases and the color density becomes deeper. Therefore, the molten glass 2 is a gob 6 with colored streaks.
Therefore, in the case of a bottle molding machine, bottles having various types of color streaks 11 as shown in FIGS. 4A to 4C, for example, are manufactured. When the sintered body 7 held in the holder 8 melts and disappears, it is replaced with another holder 8 holding a new sintered body 7. As shown in FIG. 5, if the holder 8 is moved continuously or intermittently in a direction substantially perpendicular to the flow direction of the molten glass 2, colored streaks 11 can be formed in the glass product.
You can freely change the position of the Also,
As shown in FIG. 6, by arranging a plurality of holders 8 in parallel at intervals in a direction substantially perpendicular to the flow direction of the molten glass 2, it is possible to insert a plurality of colored streaks of the same or different colors at the same time. . 7 and 8 show an example in which the feeder 1 can be continuously replenished with the sintered body 7. A brick insertion pipe 12 is vertically erected in the floor hearth 3, and the sintered bodies 7 are successively inserted into this insertion pipe 12, and only the lowest one sintered body 7 is inserted into the lower end of the insertion pipe 12. It is immersed in the molten glass 2 by protruding from the molten glass 2. When the protruding molten glass 2 is melted and shortened, additional sintered bodies 7 are sequentially inserted from the upper end of the insertion pipe 12. When the sintered body 7 is immersed using the insertion pipe 12 in this manner, the sintered body 7 may be in the form of small pieces. In addition, in FIG. 8, the reference numeral 13 is a bracket for fixing the insertion pipe 12. In the above embodiment, the sintered body 7 is immersed in the molten glass 2 within the front hearth 3, but it may also be immersed within the spout 4 as shown in FIG. When immersed in the floor hearth 3, the distance between the sintered body 7 and the glass outlet 5 is longer than when immersed in the spout 4, so the diffusion width of the metal oxide becomes larger until it reaches the glass outlet 5. , the width of the color streaks also becomes wider. When immersing in the spout 4, the width of the color streak can be made smaller, but the time required for the metal oxide to dissolve until it reaches the glass outlet 5 is shortened, and there is a risk that the glass will be formed before the metal oxide is sufficiently dissolved. be. For this reason, it is preferable that the sintered body 7 is immersed in the floor hearth 3 and that the color streaks are adjusted by the sintered body 7 itself.

【Effect of the invention】

According to the present invention, there are the following effects. The coloring agent used is a sintered metal oxide, so the metal oxide is melted and mixed into the molten glass and directly colors it, so it has good affinity for the molten glass and can be used to color glass products. It does not cause any distortion in the part. Can be clearly colored. Since the coloring agent is a sintered body in a predetermined shape such as a rod or a small piece, it is easy to handle and position the colored area when adding color streaks to the glass substrate, and there is no need for large-scale feeding equipment and adjustment like conventional color frits. No equipment is required. Controlling the pattern of color streaks is much easier than in the past. Since the coloring agent is made by adding glass powder to metal oxide and sintering it, the melting of the metal oxide in the sintered body is promoted, making it possible to increase the color density and adjust the amount of glass powder added. By this, the color density can be adjusted. A sintered body in a predetermined shape such as a rod or a small piece is immersed in the molten glass in the feeder while adding coloring agent sequentially, so the metal oxide does not diffuse immediately but gradually spreads from the surface of the sintered body. Therefore, the colored area can be easily adjusted by changing the immersion position of the sintered body, and the coloring concentration and range can be easily adjusted by changing the size and amount of the sintered body to be immersed. .

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an example of the manufacturing method according to the present invention, Fig. 2 is a perspective view of the sintered body held in a holder in the method, and Fig. 3 is a cross-sectional view of the sintered body immersed in molten glass. Figures 4A to 4C are front views of colored streaked glass products manufactured by this method, Figures 5 and 6 are explanatory diagrams showing modified examples of the method of the present invention, and Figure 7 8 are a perspective view and a sectional view of another method of immersing a sintered body in molten glass, and FIG. 9 is a sectional view showing another example of the method of the present invention. 1... feeder, 2... molten glass, 3... floor hearth, 4... spout, 5... glass outlet, 6... gob, 7... sintered body, 8... holder,
9...Insertion port, 10...Horizontal hole, 11...Color streak,
12...Insertion pipe, 13...Bracket.

Claims (1)

[Claims] 1 Add glass powder to metal oxides such as cobalt oxide, copper oxide, nickel oxide, chromium oxide, manganese dioxide, etc. and sinter the colorant into a sintered body of a predetermined shape such as a rod or small piece into a feeder. 1. A method for manufacturing a glass product with colored streaks, characterized in that the metal oxide is immersed in a molten glass in order to form colored streaks by dissolving the metal oxide in the molten glass.