Method and device for non-contact moulding of fused glass gobs
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsAndreas Langsdorf, Norbert Greulich-Hickmann, Jörg Adler, Michael Piwonski
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Abstract
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.
Claims11
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.
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.
Dependencies are inferred from the claim text.