Title:
EXTRUSION METHOD AND EXTRUSION DEVICE FOR PRODUCING A CLOSED CERAMIC TUBE WITH A BASE
Document Type and Number:
WIPO Patent Application WO/2017/152913
Kind Code:
A3
Abstract:
The extrusion device has a mouthpiece (3), a mandrel (4) which is arranged coaxially with respect to the mouthpiece and in which a piston (6) can be moved coaxially in a cylinder bore (5), said piston comprising a cylinder head (6.1) which closes the cylinder bore (5), and a closure piece (7) which closes the mouthpiece (3) and can be temporarily withdrawn, the inner shape of the closure piece (7) and the outer shape of the mandrel (4) defining a gap (8) which corresponds to the shape of the base (1) which is to be produced. Inside the cylinder bore (5), a lift cylinder (6.2) is arranged in which the piston (6) can be movably guided independently from a gas pressure prevailing in the cylinder bore (5) Advantageously, the closure piece (7) can be heated and cooled.
Inventors:
HOFACKER MARTIN (DE)
KIESEL LUTZ (DE)
KIESEL LUTZ (DE)
Application Number:
PCT/DE2017/100183
Publication Date:
November 02, 2017
Filing Date:
March 09, 2017
Export Citation:
Assignee:
FRAUNHOFER GES FORSCHUNG (DE)
International Classes:
B28B3/26
Foreign References:
| DE2715852A1 | 1978-10-12 | |||
| JPH03187710A | 1991-08-15 | |||
| EP1552913A1 | 2005-07-13 |
Attorney, Agent or Firm:
OEHMKE, Volker et al. (DE)
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