Method and apparatus for the hot shaping of molten gobs

Abstract

The invention relates to a method for the hot shaping of molten gobs on a mold base by interposing a gas bed, comprising the following method steps. According to the invention such a method comprises the following method steps: a mold base made of open-pore mold material is produced; the supporting surface of the mold base is coated permanently with a glass contact material; such a coating material is chosen or the coating is arranged in such a way that the layer comprises open pores after its application which allow a gas-conductive connection between the lower side and the upper side of the layer; the mold base is charged with a gas in order to produce a gas bed on the upper side of the layer.

1 - 3 . (canceled).  
     
     
         4 . An apparatus for the hot shaping of molten gobs on a gas bed, comprising the following elements: 
 a base made of an open-pore mold material;    the supporting surface of the mold base is coated with a glass contact material which prevents gluing or adhering to the gob;    the layer is also open-porous;    a gas connection is provided on the side of the mold base which is averted from the gob in order to apply a gas to the mold base which passes through the mold base as well as through the pores of the layer.    
     
     
         5 . An apparatus as claimed in  claim 4 , characterized in that the layer comprises a thickness in the range of 0.5 to 50:m.  
     
     
         6 . An apparatus as claimed in  claim 4 , characterized in that the pores of the mold base and/or the layer comprise a pore diameter of 2 to 100:m.  
     
     
         7 . An apparatus as claimed in  claim 4 , characterized in that the pores of the mold base and/or the layer comprise a pore volume of 5 to 40% by volume.  
     
     
         8 . An apparatus as claimed in  claim 4 , characterized in that the pores of the mold base are smaller in the zone facing the gob than the zone averted from the gob.  
     
     
         9 . An apparatus as claimed in  claim 4 , characterized in that the mold base is made up of layers of different pore size.  
     
     
         10 . An apparatus as claimed in  claim 4 , characterized in that the mold base consists of metal, noble metal, alloys thereof or ceramics, or layers of said materials.  
     
     
         11 . An apparatus as claimed in  claim 4 , characterized in that the layer consists of a noble metal of the first or eighth subgroup of the periodic system of elements or of any alloys of said elements among one another.  
     
     
         12 . An apparatus as claimed in  claim 4 , characterized in that the layer comprises a finer porosity than the mold base.  
     
     
         13 . An apparatus as claimed in  claim 4 , characterized in that the layer comprises a microporosity of between 0.1 and 20% by volume, preferably between 4 and 15% by volume.  
     
     
         14 . An apparatus as claimed in  claim 4 , characterized in that the open-pore mold material is a refractory metal.  
     
     
         15 . An apparatus as claimed in  claim 14 , characterized in that the porous refractory metal is from the group of NiCrAl or FeCrAl alloys.  
     
     
         16 . A method as claimed in  claim 4 , characterized in that the layer is applied onto the mold base by sputtering, spraying, immersing or separation from solutions or suspension.  
     
     
         17 . An apparatus as claimed in  claim 5 , characterized in that the pores of the mold base and/or the layer comprise a pore diameter of 2 to 100 μm.  
     
     
         18 . An apparatus as claimed in  claim 5 , characterized in that the pores of the mold base and/or the layer comprise a pore volume of 5 to 40% by volume.  
     
     
         19 . An apparatus as claimed in  claim 6 , characterized in that the pores of the mold base and/or the layer comprise a pore volume of 5 to 40% by volume.  
     
     
         20 . An apparatus as claimed in claimed  5 , characterized in that the pores of the mold base are smaller in the zone facing the gob than the zone averted from the gob.