Apparatus for press-forming molten bodies
AssigneeSchott AG
InventorsChristian Kunert, Andreas Langsdorf, Norbert Greulich-Hickmann
Life of this patent
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Abstract
An apparatus for press-forming a molten gob made of meltable material, especially of glass or glass ceramics, into a body of specific shape with compression moulds which form with each other a form cavity for receiving the gob. The compression moulds consist at least in the zone of the forming surfaces of an open-pore material and the compression moulds are connected to a pressure gas source in order to produce a gas stream which emerges from the forming surfaces. The open-pore material of the forming surfaces the pores close to the forming surfaces are smaller than the pores remote from the forming surfaces.
Claims11
An apparatus for press-forming a gob of molten glass or glass ceramics into a body of specific shape, said apparatus comprising:
- compression molds which form with each other a form cavity for receiving the gob, said molds having forming surfaces;
- the compression molds consisting essentially of an open-pore material at least in a zone of the forming surfaces;
- the compression molds being connected to a pressure gas source in order to produce a gas stream which emerges from the forming surfaces;
- in the open pore material of the forming surfaces the pores close to the forming surfaces being smaller than the pores remote from the forming surfaces;
- wherein the pores situated next to the forming surfaces have a diameter of 2 to 100 μm;
- wherein the material close to the forming surfaces has an open pore volume of 5 to 40% by volume.
Dependencies are inferred from the claim text.