WO2003062158A1 - Method of producting a hollow glass body and a core for production of a glass body - Google Patents
Method of producting a hollow glass body and a core for production of a glass body Download PDFInfo
- Publication number
- WO2003062158A1 WO2003062158A1 PCT/SE2002/002263 SE0202263W WO03062158A1 WO 2003062158 A1 WO2003062158 A1 WO 2003062158A1 SE 0202263 W SE0202263 W SE 0202263W WO 03062158 A1 WO03062158 A1 WO 03062158A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- paris
- plaster
- negative
- mould
- glass body
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
Definitions
- the present invention concerns a way to fabricate a glass body with an inner cavity that is connected to the surroundings via an opening.
- the present invention also concerns a method for fabrication of a plaster of Paris negative for use at the fabrication of a glass body, in particular with an inner cavity at which method the plaster of Paris negative is molded in a mould.
- the plaster of Paris that is used should preferably be gypsum with a purity of at least 99% .
- the plaster of Paris negative and the outer mould are heated to 600°C before the glass melt is supplied, in order to reduce the temperature difference between the glass melt, the temperature of which is about 1000 - 12000°C and the plaster of Paris negative and thereby the amount of gas that is produced when the hot glass melt meets the surface of the plaster of Paris negative. Said suction is preferably maintained until the glass melt in contact with of the surface of the plaster of Paris has solidified.
- the hose is preferably inserted into the mould to such a position that it essentially extends along the sides of the mould and at a distance from these of at least about
- Fig 1 is a cross section depicting a cavity model.
- the gas that despite the reduced temperature difference is generated anyhow when the glass melt meets the plaster of Paris surface is evacuated by means of the suction source via the micro-channels in the plaster of Paris negative 11 and the glass filament stocking 9 to prevent the formation of air bubbles in the glass. Thanks to this suction the melt can also penetrate into fine details in the surface of the plaster of Paris negative 11. Suction is maintained until the glass melt has stabilized, that is the surface of the glass melt in contact with the plaster of Paris negative has solidified.
- the glass bodies with inner cavities that can be made with the above described method are for instance glass sculptures and glass reliefs but also glass bodies for technical use.
- a plaster of Paris negative for use at the fabrication of a glass body has been described with reference to the fabrication of a glass body with an inner cavity the man skilled in the art ought to realize that this method can also be used at the fabrication of a plaster of Paris negative that is to be used for the fabrication o a solid glass body, the outer walls of which having a negative release.
- a plaster of Paris negative is made with a cavity, to which is fed glass melt and which shape corresponds to the outer shape of the ready solid glass body.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Building Environments (AREA)
- Moulds, Cores, Or Mandrels (AREA)
- Producing Shaped Articles From Materials (AREA)
Abstract
At a method for the fabrication of a glass body with an inner cavity, that is connected to the surroundings via an opening, a plaster of Paris negative (11) is made, the shape of which corresponds to the cavity of the ready glass body, of gypsum and provided with a hose (9) made of an air permeable material that from the outside extends into the plaster of Paris negative in a part thereof, that essentially corresponds to the opening of the ready glass body. The plaster of Paris negative (11) is placed in an outer mould (12), the inner shape of which corresponds to the outer shape of the ready glass body. Thereafter melt glass is fed to the outer mould. During the pouring of the glass melt suction is achieved in the plaster of Paris negative by means of the hose (9). When the glass melt has solidified around the plaster of Paris negative (11) this is dissolved and removed. At a method for fabrication of a plaster of Paris negative (11) for use at the fabrication of a glass body the plaster of Paris negative is cast in a mould, and a hose (9) made of an air permeable material is inserted into the mould before the casting. The mould is filled with plaster of Paris compound, that is brought to solidify around the hose.
Description
METHOD OF PRODUCTING A HOLLOW GLASS BODY AND A CORE FOR PRODUCTION OF A GLASS BODY
Technical field
The present invention concerns a way to fabricate a glass body with an inner cavity that is connected to the surroundings via an opening. The present invention also concerns a method for fabrication of a plaster of Paris negative for use at the fabrication of a glass body, in particular with an inner cavity at which method the plaster of Paris negative is molded in a mould.
Technical background
A glass body with an inner cavity can be made by molding if the walls of the cavity has such an inclination that a steel or graphite core, that is to shape the cavity, can be removed from the glass body after the molding. If the walls of the cavity has a negative release however the glass body with the cavity can not be made by means of such a core but is made by blowing or hand engraving. Both these methods have drawbacks. At blowing the cavity walls can not be made with a detailed surface pattern. At engraving very detailed surface patterns can be made but the method is very time consuming and does not allow exact reproduction.
Summary of the invention
One object of the invention is to remedy these drawbacks and provide a method of the initially mentioned type, that makes it possible to fabricate a glass body with an inner cavity, the walls of which have a negative release and can be given a surface with fine details. This object is achieved by means of the method for fabrication of a glass body with an inner cavity that is connected to the surroundings via an opening, by means of a plaster of Paris negative, the shape of which corresponds to the cavity of the ready glass body, is made of plaster of Paris and provided with a hose made of air permeable material, that from the outside extends into the plaster of Paris negative in a part thereof that essentially corresponds to the opening of the ready glass body, that the plaster of Paris negative is placed in an outer mould, the inner shape of which corresponds to the outer shape of the ready glass body, that the outer mould is supplied with glass, melt, that during the supply of the glass melt a suction effect is achieved in the plaster of Paris negative by means of the hose and a
suction source connected to this and that the glass melt is brought to solidify around the plaster of Paris negative, that is thereafter dissolved and removed.
The plaster of Paris that is used should preferably be gypsum with a purity of at least 99% . Preferably the plaster of Paris negative and the outer mould are heated to 600°C before the glass melt is supplied, in order to reduce the temperature difference between the glass melt, the temperature of which is about 1000 - 12000°C and the plaster of Paris negative and thereby the amount of gas that is produced when the hot glass melt meets the surface of the plaster of Paris negative. Said suction is preferably maintained until the glass melt in contact with of the surface of the plaster of Paris has solidified.
Another object of the invention is to achieve a method for the fabrication of a plaster of Paris negative for use at the fabrication of a glass body, by means of which plaster of Paris negative it is possible to fabricate a glass body, the walls of which having negative release and detailed surface pattern.
This object is achieved by means of the method to fabricate a plaster of Paris negative for use at the fabrication of a glass body, at which method the plaster of paris negative is cast in a mould, by the inserting of a hose made from an air permeable material into the mould before the casting and that the mould is filled with Plaster of Paris compound, that is brought to solidify around the hose.
Air is blown into the solidified plaster of Paris preferably by means of the hose and a blow source connected to this in order to press the surplus water out from the plaster of Paris and form air channels therein.
The plaster of Paris compound that is used at said method preferably contains α-gypsum with a purity of at least 99%.
The hose is preferably inserted into the mould to such a position that it essentially extends along the sides of the mould and at a distance from these of at least about
5mm so that the plaster of Paris negative is not destroyed by the blowing in of air therein and at the most about 70mm in order to obtain optimum suction when using the plaster of Paris negative at the fabrication of a glass body.
The part of the hose inserted into the mould is preferably stiffened by means of a bendable metal wire so that it can be bent and retain its bent shape after the inserting into the mould.
With plaster of Paris negative is in this description meant a plaster of Paris mould , that in relation to the internal or external shape of the intended glass body has an inverted shape. α-gypsum is a gypsum, that contains at least 70% α-hemihydrate particles, which have a low porosity and is rod-shaped and which thus can be packed tight and form a hard gypsum.
Brief description of the drawing
The invention is below to be described in detail by means of an enclosed drawing and with reference to a preferred method to fabricate a glass body with an inner cavity and a preferred method for fabrication of a plaster of Paris negative for use in said method.
Fig 1 is a cross section depicting a cavity model.
Fig 2 is a cross section showing the cavity model in fig 1 encased in mould silicon in a mould. fig 3 is a cross section depicting a molding silicon mould, in the cavity of which a glass filament stocking is inserted.
Fig 4 is a cross section and depicts a plaster of Paris casting of the cavity of the molding silicon mould cavity, which casting constitutes a plaster of Paris negative and is shown placed in a glass casting mould.
Fig 5 is a cross section and depicts the plaster of Paris mould containing glass casting mould of fig 4 filled with glass melt.
Fig 6 is a cross section and depicts a ready glass body.
Description of preferred embodiments
In figs 1-6 preferable embodiments of a way to fabricate a glass body with an inner cavity are shown and a method for fabrication of a plaster of Paris negative, which can be used at the method to fabricate such a glass body.
At the fabrication of a glass body 1 with an inner cavity 2 a model 3 of the cavity is first made as shown in fig 1. This model or core is placed on a base plate 4 that is provided with upstanding walls 5, and is enclosed, as shown in fig 2, in molding silicon to make an elastic mould 7 (fig 3). Instead of silicon for instance latex or some other material allowing fabrication of an elastic mould can be used. When the silicon 6 has vulcanized the
walls 5 and the base plate 4 are removed and the core 3 is taken out of the elastic mould 7. This now has a cavity 8, which has the same shape as the cavity 2 of the ready glass body 1 and into which cavity a glass filament hose or stocking 9 is inserted. This stocking 9 can also be made of some other material than glass filaments, provided that it can withstand the high temperatures present at glass fabrication, that the ready stocking is bendable and that its walls are air permeable. Along the stocking a soft metal wire extends (not shown) enabling the stocking to be bent and to retain its bent shape.
The end of the stocking 9 extending out from the cavity 8 of the mould 7 is provided with a connection 10, that can be connected to a suction source in the shape of a vacuum pump and a blow source in the shape of a unit for compressed air. Thereafter the cavity of the mould 7 is filled with α-gypsum, that thereby will enclose the glass filament stocking 9, for the making of a plaster of Paris negative 11. The gypsum is α-gypsum with a purity of at least 99% , which gypsum can withstand the high temperatures at glass melting.
When the plaster of Paris has solidified and the plaster of Paris negative 11 has been taken out from the elastic mould 7, the stocking 9 is connected to the blow source and air is blown into the plaster of Paris negative via the stocking to press out the surplus water of the plaster of Paris and form micro-channels between the walls of the stocking 9 and the surface of the plaster of paris negative 11.
The stocking 9 is at insertion into the cavity 8 of the elastic mould 71 placed in such a way that it extends along the walls of the cavity with a smallest distance of about 5mm and a largest distance of about 70mm from these walls. If the stocking is placed closer to the walls than 5mm there is a risk that the plaster of Paris cracks when air is blown into the plaster of Paris negative 11. If the stocking is placed at a distance larger than 70mm micro- channels will not form to a sufficient extent. The plaster of Paris negative is then placed in an outer or glass casting mould
12 of steel or graphite, which form has a bottom hole, from which the connection 10 of the stocking 9 extends out of the mould 12. The inner shape of the glass casting mould 12 corresponds to the outer shape of the ready glass body. The plaster of Paris negative 11 and the glass coating mould 12 are heated to about 600°C, before a glass melt is fed to the the mould and this in order to reduce the temperature difference between the glass melt, the temperature of which is about 1000-1200°C, and the plaster of Paris negative and thereby reduce the amount of gas that is generated when the hot glass melt meets the surface of the plaster of Paris surface. Thereafter the connection 10 is connected to the suction source, that
at the feeding of the glass melt to the glass casting mould 12 sucks the glass melt towards the surface of the plaster of Paris. The gas that despite the reduced temperature difference is generated anyhow when the glass melt meets the plaster of Paris surface is evacuated by means of the suction source via the micro-channels in the plaster of Paris negative 11 and the glass filament stocking 9 to prevent the formation of air bubbles in the glass. Thanks to this suction the melt can also penetrate into fine details in the surface of the plaster of Paris negative 11. Suction is maintained until the glass melt has stabilized, that is the surface of the glass melt in contact with the plaster of Paris negative has solidified.
When the glass melt in its entirety has solidified the glass is cooled in a conventional way in a cooling oven. Thereafter the plaster of Paris negative 11 is dissolved and the gypsum is washed out of the cavity 2 of the glass body by means of water, that is ejected against the plaster of Paris negative at a high pressure. Depending on the intended use for the glass body it is afterwards treated by for instance surface polishing of the gate side.
The glass bodies with inner cavities that can be made with the above described method are for instance glass sculptures and glass reliefs but also glass bodies for technical use.
Even if the method for the fabrication of a plaster of Paris negative for use at the fabrication of a glass body has been described with reference to the fabrication of a glass body with an inner cavity the man skilled in the art ought to realize that this method can also be used at the fabrication of a plaster of Paris negative that is to be used for the fabrication o a solid glass body, the outer walls of which having a negative release. In one such case a plaster of Paris negative is made with a cavity, to which is fed glass melt and which shape corresponds to the outer shape of the ready solid glass body.
It is also possible to make a glass body the walls of which having negative release on the inside as well as on the outside by means of a Plaster of Paris negative for the inner shape of the glass body and an other plaster of Paris negative for the outer shape of the glass body.
Claims
1. Method for the fabrication of a glass body 1 with an inner (cavity), that is connected to the surrounding via an opening, characterized in, that a plaster of Paris negative (11), the shape of which corresponds to the cavity (2) of the ready glass body (1), is made of plaster of Paris and provided with a hose (9) made of air permeable material, that from the outside extends into the plaster of Paris negative (11) in a part thereof that essentially corresponds to the opening of the ready glass body, that the plaster of Paris negative (11) is placed in an outer mould (12), the inner shape of which corresponds to the outer shape of the ready glass body (1), that glass melt is fed to the outer mould (12), that during the feeding of the glass melt suction is achieved in the plaster of Paris negative (11) by means of the hose (9) and a suction source connected to this and that the glass melt is brought to solidify around the plaster of Paris negative (11) that is then dissolved and removed.
2. Method according to claim 1, at which the plaster of Paris negative is made of o!-gypsum preferably with a purity of at least 99%.
3. Method according to claim 1 or 2, at which the plaster of Paris negative (11) and the outer mould are heated to about 600°C before the pouring of the glass melt.
4. Method according to any of the claims 1 - 3, at which said suction is maintained essentially until the surface of the glass melt in contact with the plaster of Paris negative (11) has solidified.
5. Method for the fabrication of a plaster of Paris negative (11) for use at the fabrication of a glass body (1), as for instance a glass body with an inner cavity (2), at which method the plaster of Paris negative is cast in a mould (7), characterized in that a hose (9) made from air permeable material is inserted into the mould (7) before the casting and that the mould (7) is filled with plaster of Paris compound, that is brought to solidify around the hose (9).
6. Method according to claim 5, at which air is blown into the solidified plaster of Paris by means of the hose (9) and a blow source connected to this in order to press out surplus water from the plaster of Paris and make air channels therein.
7. Method according to claim 5 or 6, at which the plaster of Paris compound contains α-gypsum with a purity of at least 99% .
8. Method according to any of the claims 5-7, at which the hose (9) is inserted into the mould to such a position that it essentially extends along the walls of the mould and at a distance from these.
9. Method according to claim 8, at which said distance is at least 5 mm
10. Method according to any of the claims 5-9, at which the part of the hose (9) inserted into the mould is stiffened by means of a bendable metal wire.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0104185-4 | 2001-12-13 | ||
| SE0104185A SE0104185L (en) | 2001-12-13 | 2001-12-13 | Methods of producing a glass body with voids and a method of producing negatives therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003062158A1 true WO2003062158A1 (en) | 2003-07-31 |
Family
ID=20286295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE2002/002263 WO2003062158A1 (en) | 2001-12-13 | 2002-12-10 | Method of producting a hollow glass body and a core for production of a glass body |
Country Status (2)
| Country | Link |
|---|---|
| SE (1) | SE0104185L (en) |
| WO (1) | WO2003062158A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE408296B (en) * | 1974-07-25 | 1979-06-05 | Rosenthal Ag | CERAMIC SINGLE OR MULTIPLE-MOLDED MOLD FOR MANUFACTURE OF COMPLICATED GLASS FORMS |
| JPS5622642A (en) * | 1979-07-28 | 1981-03-03 | Yoshida Kiyasuto Kogyo Kk | Manufacture of hollow transparent object |
| US4288238A (en) * | 1979-01-08 | 1981-09-08 | Klepsch Kunst Gmbh & Co. Kg Galerie | Process and mould for the manufacture of multi-walled hollow bodies, especially of glass |
| DE3306138A1 (en) * | 1983-02-22 | 1984-08-30 | Veit Dennert KG Baustoffbetriebe, 8602 Schlüsselfeld | Moulding table for concrete plates |
-
2001
- 2001-12-13 SE SE0104185A patent/SE0104185L/en not_active IP Right Cessation
-
2002
- 2002-12-10 WO PCT/SE2002/002263 patent/WO2003062158A1/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE408296B (en) * | 1974-07-25 | 1979-06-05 | Rosenthal Ag | CERAMIC SINGLE OR MULTIPLE-MOLDED MOLD FOR MANUFACTURE OF COMPLICATED GLASS FORMS |
| US4288238A (en) * | 1979-01-08 | 1981-09-08 | Klepsch Kunst Gmbh & Co. Kg Galerie | Process and mould for the manufacture of multi-walled hollow bodies, especially of glass |
| JPS5622642A (en) * | 1979-07-28 | 1981-03-03 | Yoshida Kiyasuto Kogyo Kk | Manufacture of hollow transparent object |
| DE3306138A1 (en) * | 1983-02-22 | 1984-08-30 | Veit Dennert KG Baustoffbetriebe, 8602 Schlüsselfeld | Moulding table for concrete plates |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 5, no. 71 (C - 054) 13 May 1981 (1981-05-13) * |
Also Published As
| Publication number | Publication date |
|---|---|
| SE518785C2 (en) | 2002-11-19 |
| SE0104185D0 (en) | 2001-12-13 |
| SE0104185L (en) | 2002-11-19 |
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