JPS5874530A - Production of remelted decorative glass body - Google Patents

Abstract

PURPOSE:To obtain a titled glass body having a decorative effect from general transparent glass for commercial purposes by heat-treating the blank material glass laminated with cullets at the temp. at which crystals deposit on the surfaces of the respective cullets and remelting the same at the temp. at which the crystals are not annihilated then cooling the glass quickly. CONSTITUTION:This invention is adapted to production of, for example, decorative plate glass for screens of a square plate-like shape having rugged patterns in the central part. More specifically cellets (blank material glas) 3, 4 of light barium crown glass consisting of 30-40mm. grain sizes are laminated and disposed in the central rugged patterns 1 of a square form 2 made of gypsum refractories, and those consisting of 2-15mm. grain sizes in the other parts. The form 2 in this state is loaded into an electric furnace and is heated quickly to 680 deg.C at which the viscosity of the blank material glass attains 10<8> poise and further the form is heated up to 730 deg.C to allow crystals to form. After the blank material glass is remelted at the temp. at which the respective cullets 3, 4 melt stick to each other and the crystals are not annihilated, the glass is cooled quickly at the speed at which said crystals are not annihilated and the fresh crystals do not deposit. Thereafter the glass is further cooled gradually, whereby a plate product A for screens consisting of the transparent rugged patterns 5 in the center and opaque parts 6 in the circumference is obtained.

Description

[Detailed Description of the Invention] The method of sintering glass powder or glass powder has been known for a long time, and in particular, the method of putting glass powder or the like together with an organic binder into a mold, sintering, and remelting it is one of the few methods. The sintered glass body is widely used in the electrical industry and other industries. There is.

Therefore, although many sintered glass bodies have been developed for industrial purposes, there have been relatively few developments of sintered glass bodies for decorative purposes.
As in No. 613 and No. 10-614, pattern-forming glass powder and bonding glass powder are sintered, or as in Japanese Patent Publication No. 42-23952, a coloring agent is mixed with glass powder and sintered. Things to connect, etc.
There are only some that obtain a decorative effect mainly through coloring.

In addition, among the things that have been developed as artificial marble,
As in JP-A-50-32215 and JP-A-32216, there is a product in which crystallized glass powder containing no ZrO2 or TlO2 as a nucleating agent is sintered, but this is different from ordinary commercial glass. It is something.

Generally, when solidified glass is reheated to a temperature above which the viscosity becomes 10'' poise, a phenomenon of surface devitrification in which crystals precipitate on the surface G occurs.

Crystals that precipitate in ordinary glass vary depending on the composition of the glass material, but crystals such as cristobalite 1, tridymite, carnegiite, nephelin, debitrite, wolastrite, diopside, and corundum are known to precipitate. ing.

These crystals are fine and have a difference in refractive index Cc from that of the material glass, so they cause light scattering and are characterized by a white, four-shaped appearance.

The material is a commercially available board that does not contain lead.

Glass tends to cause surface devitrification, and crystal glass, which contains a large amount of lead, has a property that makes surface devitrification difficult to occur. In order to cause this, it is necessary to consider the temperature and time depending on the properties of the material.

In addition, the quantitative ratio of surface devitrification of the raw glass does not affect the particle size of the current constituting the raw glass; the smaller the particles, the higher the quantitative ratio of devitrification, and the larger the powder, the larger the quantitative ratio of devitrification. The percentage will decrease.

Therefore, the forces that these glass materials are made of are
When the proportions of large and small particles are appropriately determined and sintered, the crystal nuclei in the small part of the particles take on a four-shape shape, while in the large part of the particles, the crystal nuclei are almost invisible and appear transparent.

The precipitated crystals do not disappear at the temperature at which the raw glass flows and is fused together, but remain as a white color at the boundary between each cullet ('C), and this white area can be observed under a dull microscope. I was able to clearly see that fine transparent crystals were scattered and appeared white due to diffused reflection.

The present invention has completed a method for producing a re-melted decorative glass body having a decorative effect based on the above-mentioned surface devitrification principle and experiments using general commercial transparent glass.
A crystallization process in which raw glass, which is made by stacking currents such as glass lumps, is heat-treated at a temperature that causes crystals (devitrification) to precipitate on the surface of each current, and after about t, the crystals (devitrification) disappear. The material glass is remelted at a temperature that does not exceed
There are five steps: a re-melting process in which the glass is heat treated at a temperature that allows it to be integrated, and a cooling process in which the integrated glass body is cooled and solidified at a rate that does not allow crystals (devitrification) to grow after this step. Features.

An embodiment of the method for manufacturing a remelted decorative glass body according to the present invention will be described with reference to the attached drawings.

A case will be described in which a rectangular plate-shaped decorative plate glass for a screen having an uneven pattern in the central portion is manufactured as a decorative glass body.

The uneven pattern (1) is expressed in the central circular part, and the uneven pattern (1) of the rectangular formwork (2) cast from gypsum-based refractory material.
Light barium crown crow cullet (material crow) (3) and (4) having a grain size of 30 to 40 sl11 is layered in the other parts, and 2 to 15 sl in the other parts. .

The formwork f21I-i in which this raw glass is placed is installed in a known electric furnace (not shown) with uniform temperature distribution and temperature control.

The raw glass is heated at rapid G to 680C, where its viscosity becomes 106 poise Cc in 4 hours, and then heated to 107 poise Cc during addition to generate crystals (devitrification).
The temperature is raised to C and the crystallization process is completed.

After the crystallization process, the raw glass is divided into its respective cullet f31
f4) are welded together and the temperature at which the crystals do not disappear;
That is, the viscosity is 10' to 104·l poise88
The temperature is raised to 0C in 15 minutes, and this temperature is maintained for 15 minutes to complete the remelting process.

After the remelting process is completed, the speed at which the crystals precipitated in the crystallization process do not disappear and new crystals do not precipitate, that is,
After being rapidly cooled to 500C where the viscosity becomes 1011 in 5 minutes, it is further slowly cooled down to 450C where the viscosity becomes 101 in 2 hours, and the integrated material glass is de-strained, and thereafter, it is cooled over 24 hours. The cooling process is completed by slow cooling to room temperature, and the entire process is completed.

After completion of the entire process, the remelted decorative glass body is taken out from the electric furnace together with the formwork (2), and the decorative glass body (Al) is taken out from the formwork (2). - The product obtained in this way In fAl K, a transparent circular uneven structure (5) at the center Qζ is visible, and the surrounding ground part is a CC mesh between the cullets of the raw glass, and a white devitrified part (
6) can be seen.

Although the above steps were tried using crystal glass, borosilicate glass, porium crown glass, and other various types of glass as the raw material glass, light barium crown glass was produced. L,
The particle size of the current constituting the raw glass is preferably 2N or more.If cullet with a particle size of 2N or less is used, a large amount of fine air bubbles will remain in the product, and the decorative effect due to devitrification ζ will be visually recognized. Therefore, it is particularly undesirable if the purpose is to obtain the decorative effect of air bubbles Kj, but it is not preferable if the purpose is to obtain all the decorative effects due to devitrification.

In addition, the upper limit of the particle size of cullet is determined by the size of the transparent part of the decorative glass body to be manufactured, and the material glass must be treated before use (C beforehand by dealkalization of the surface by pickling). It was confirmed that, if carried out, the precipitation of silicic acid crystals would be promoted, and there would be no problem in integrating it into a decorative glass body even if no binder was mixed into the glass material.゛The viscosity value during each step in this example is exceptional, and the indicated values for temperature and time differ depending on the type of raw glass aK, so the crystal precipitation state, the welding state of the raw glass, or the crystal precipitation suppression state during cooling It is obvious that the conditions for strain removal and the like can be determined as appropriate depending on the type of material glass used.

To explain this from the perspective of viscosity and time, in the general 2. crystallization process V, the temperature of the raw material glass is raised as rapidly as possible until the viscosity reaches 1 (7' poise). The temperature increase rate from poise to 107 poise is the curved crystal (
To increase the precipitation of devitrification, do it slowly, and to decrease the precipitation, do it quickly. It is preferable to raise the temperature rapidly.

In the remelting process, the temperature range in which the material Karasu is welded to Ichibayashi VC is 10! ~] The maintenance time of Q1j poise is
It is preferable to set a time CC for the raw glass to be welded in one layer and for the surface of the integrated glass body to become smooth.

From the viscosity of 10' to 10' Poise in the remelting process to 10' Poise in the cooling process, the viscosity is rapidly increased in order to grow crystals in the glass body or to prevent the precipitation of new crystals. It is preferable to perform cooling, and the viscosity of the strain removal process during the cooling process is 1018 poise to 10''.
Up to 1014 poise, the time required to remove strain from the surface of the integrated glass body should be determined.The cooling time after 1014 poise until solidification is determined by the usual method until the glass body reaches room temperature. It is sufficient to slowly cool the material at a speed that does not cause destruction.

In this example, a case is shown in which a decorative plate glass for a screen is manufactured, but the decorative glass body is not limited to a plate shape.
It goes without saying that it can be of any form, such as a figurine-like block, a container, a rod-like object, a tubular object, etc., and known decorative techniques such as unevenness, coloring, polishing, cutting, gravure, sandblasting, etching, etc. can be applied to the manufactured decorative crow object. It is self-evident that it can be used in combination with scales.

Since the present invention is manufactured by the above method,
Crystals are precipitated between the currents 6 that make up the material glass, and the integrated decorative glass body is a re-melted decoration that has an elegant and beautiful decorative effect as if there were a network of white mist inside. In addition to being able to obtain a glass body, there is an advantage that it can be manufactured using general commercial plate glass by simply controlling the temperature, without using a glass material having a special composition. .

In addition, as shown in Example 6, in the case where the material glass is light barium crown glass, it is easier to control temperature and crystal precipitation than other types of glass, which is advantageous in terms of manufacturing. At the same time, if the cooling process 8 includes a slow cooling process for removing strain, the decorative glass body has the effect of making the finish of the decorative glass body even more beautiful.

[Brief explanation of drawings]

The drawings show an embodiment of the method for manufacturing a re-melted decorative glass body according to the present invention, in which Fig. 1 is a stacked layout diagram of cullet constituting the material glass, and Fig. 2 is a central cross-sectional view of Fig. 1. , FIG. 3 is a plan view of the finished product, FIG. 4 is a partially enlarged cut-away end view thereof, and FIG. 5 is a time chart showing the viscosity of the raw glass and the temperature control state. 3.4... Cullet (material glass) 6... Devitrification part (crystal)

Claims (3)

[Claims] (1) Glass, a material made by stacking currents such as glass grains and lumps of glass, has crystals (devitrification) on the surface of each force current.
A crystallization step in which heat treatment is carried out at a temperature at which crystals precipitate, and a remelting step in which after this step, heat treatment is carried out at a temperature at which the crystals (devitrification) do not disappear and at which the material glass is remelted and integrated. A method for producing a remelted decorative glass body, which comprises a cooling step in which, after this step, the crystals (devitrification) of the integrated glass body are cooled and solidified at a rate that does not grow. (2) The method for producing a remelted decorative glass body according to claim (1), wherein the material glass is light barium crown glass. (3) The method for producing a remelted decorative glass body according to claim 1 or 2, wherein the cooling step includes a slow cooling step for removing strain from the glass body.