Method and device for non-contact moulding of fused glass gobs
View Patent ↗The invention relates to a method and device for non-contact molding of fused glass or glass ceramic gobs by means of gas levitation, comprising the following method steps: a pre-form is generated, the pre-form is brought close to a molding tool, which may be connected to a compressed gas source on the open-pored region thereof facing the pre-form in order to generate a gas cushion between the molding tool and the pre-form and the molding tool is directly heated at least during a part of the molding phase.
1. A method for contactless shaping of gobs made of glass or glass ceramics by means of gas levitation, comprising the following method steps:
a preform is produced;
the preform is moved towards a shaping tool constructed of a mold material which is open-pored in its region facing the preform and is connected to a gas pressure source for producing a gas cushion between the shaping tool and the preform;
the mold material itself constitutes a resistive element and the shaping tool mold material is directly heated electrically and non-inductively at least during a part of the shaping process via its own electric resistance by connection in an electric circuit having a power source and conductors connected to the shaping tool mold material while current within the circuit is caused to flow through the shaping tool mold material.
2. A method as claimed in claim 1 , wherein the heating intensity and thus the temperature achievable in the shaping tool is controlled.
3. The method of claim 2 , wherein said power source is a variable power source.
4. A method as claimed in claim 2 , wherein the shaping tool mold material is sectioned with respect to its transmittable heating output, so that individual volume regions can be heated to a differently strong extent.
5. A method as claimed in claim 1 , wherein the shaping tool mold material is sectioned with respect to its transmittable heating output, so that individual volume regions can be heated to a differently strong extent.
6. The method of claim 5 , wherein said power source is a variable power source.
7. The method of claim 1 , wherein said power source is a variable power source.
8. A method for contactless shaping of gobs made of glass or glass ceramics by means of gas levitation, comprising the following method steps:
a preform is produced;
the preform is moved towards a shaping tool constructed of a mold material which is open-pored in its region facing the preform and which is connected to a gas pressure source for producing a gas cushion between the shaping tool and the preform;
the shaping tool mold material itself is directly heated electrically and non-inductively at least during a part of the shaping process by connecting the shaping tool mold material to an electric circuit, wherein the open-pored material itself is a heating resistor for the shaping tool and is heated through its own inherent electrical resistance.
9. A method as claimed in claim 8 , wherein the heating intensity and thus the temperature achievable in the shaping tool is controlled.
10. A method as claimed in claim 9 , wherein the shaping tool mold material is sectioned with respect to its transmittable heating output, so that individual volume regions can be heated to a differently strong extent.
11. A method as claimed in claim 8 , wherein the shaping tool mold material is sectioned with respect to its transmittable heating output, so that individual volume regions can be heated to a differently strong extent.