Title of Invention

"A PROCESS FOR PRODUCING GLASS TILES"

Abstract This invention relates to a process for producing glass tiles comprising steps of:- mixing of crushed glass, quartz, a binder such as clay and water to form a mixture, which is subjected to compaction in mould to form a composite; characterized in that -spraying of clear or coloured glass liquid on the composite; -sprinkling of clear or coloured glass powder on atleast one coat of the liquid; -mixing of phosphorescent agent upto 10% of the mixture such as herein described followed by heating.
Full Text FIELD OF INVENTION
This invention relates to a process for producing glass tiles.
PRIOR ART
It is known to produce glass tiles from crushed glass. In such a known process, glass is crushed and then quartz, a binder such as clay and water is added thereto to constitute a raw material. The raw material is then subjected to the step of compaction under pressure to form a shaped composite. A liquid coat consisting a clay, glass powder, colour, suspension agent and emulsifying agent in water is sprayed onto the upper surface of the shaped composite. A high alumina glass powder with or without colour may not be sprinkled on the shaped composite on top of the liquid coating. Such a step of sprinkling may be effected in a single or plurality of stages. Finally, the shaped composite with the coating is sintered at a temperature of 800° to 900°.
In another embodiment glass is crushed. Crushed quartz and colour/ opacifier if desired is added along with a binder as p.v.a and this constitute another type of raw material. The raw material is then subjected to step of compression under pressure to form a

In yet another embodiment the mix and the first coat may or may not contain phosphorescent agent and again the first sprinkled glass coat may or may not contain the phosphorescent agent. The second sprinkled coat contains the phosphorescent agent. The coated tile is fired between 800°C-900°C. The surface in this case is rough and may be left as such or further glass coatings without the phosphorescent agent are sprinkled before firing at 800-900°C.
In distinction to the known step of spraying or painting the phosphorescent agent to the lower surface of the formed tile, the present phosphorescent agent up to 10% is added to the mixture itself or to the coating on the tile.
In yet another embodiment glass powder with or without colour and opacifier with or without quartz powder having a binder such as p.v.a is another raw material. To this is added the phosphorescent agent and the shaped compact is fired to between 700° - 800°C. The surface is rough. In another embodiment to this compact the glass powder is sprinkled on top of the tile with or without phosphorescent agent before firing and the coated compact is fired at 700°C -800°C.
The phosphorescent agent is selected from fluorescent such as Zinc Sulphide, rare earth oxides, europium doped strontium aluminate silica aluminate etc. and/or proprietary phosphorescent chemicals.




I CLAIM
1. A process for producing glass tiles comprising steps of:-
- mixing of crushed glass, quartz, a binder such as clay and water to form a mixture, which is subjected to compaction in mould to form a composite; characterized in that
- spraying of clear or coloured glass liquid on the composite;
- sprinkling of clear or coloured glass powder on atleast one coat of the liquid;
- mixing of phosphorescent agent upto 10% of the mixture such as herein described followed by heating.

2. A process as claimed in claim 1, wherein the phosphorescent agent is upto 10% of the composite mixture mixed with the mixture.
3. A process as claimed in any of the preceding claims, wherein the phosphorescent agent is mixed with the liquid for spraying, in which the base mixture also contains phosphorescent agent.
4. A process as claimed in claim 3, wherein the sprinkling is followed by resprinkling of glass powder before heating, in which the mixture and the liquid for resprinkling is added with the agent.
5. A process as claimed in claim 4, wherein the glass powder mixed with a phosphorescent agent is resprinkled followed by said heating at 800-900°C, in which the mixture, the sprayed glass coat and the sprinkled glass coat contains the phosphorescent agent.
6. A process as claimed in any of the preceding claims, wherein the mixture comprising of clear or coloured glass powder, water and opacifier with or without quartz powder having a binder such as poly vinyl alcohol, preparation of which is followed by addition of phosphorescent agent, compaction and firing at 700-800°C.
7. A process as claimed in claim 6, comprising of spraying/sprinkling atleast once glass powder on the compact tile with or without the agent before firing.
8. A process as claimed in any of the preceding claims, wherein the phosphorescent agent is selected from fluorescent materials such as Zinc Sulphide, rare earth oxides, europium doped strontium, aluminate silica aluminate, proprietary phosphorescent chemicals etc.

Documents:

1248-DEL-2005-Abstract-(16-02-2012).pdf

1248-DEL-2005-Claims-(16-02-2012).pdf

1248-DEL-2005-Correspondence Others-(04-11-2011).pdf

1248-DEL-2005-Correspondence Others-(16-02-2012).pdf

1248-DEL-2005-Description (Complete)-(16-02-2012).pdf

1248-DEL-2005-Form-1-(16-02-2012).pdf

1248-DEL-2005-Form-2-(16-02-2012).pdf

1248-DEL-2005-GPA-(16-02-2012).pdf


Patent Number 251575
Indian Patent Application Number 1248/DEL/2005
PG Journal Number 13/2012
Publication Date 30-Mar-2012
Grant Date 24-Mar-2012
Date of Filing 16-May-2005
Name of Patentee UDAY GUPTA
Applicant Address 321-S, CHIRAG DELHI, NEW DELHI-110017, INDIA.
Inventors:
# Inventor's Name Inventor's Address
1 UDAY GUPTA 321-S, CHIRAG DELHI, NEW DELHI-110017, INDIA.
PCT International Classification Number E04F 13/14
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA