| 摘要 |
The present invention relates to a mandrel for producing glass tubes or rods, particularly for the Vello process, the A-drawing process and preferably for the Danner process. The mandrel comprises a body ( 1 ) of a ceramic composite material, and an external metal material jacket ( 2 ) surrounding at least a portion of said body, wherein the ceramic composite material has a substantially similar thermal expansion coefficient as the metal material of said jacket Alternatively the mandrel comprises a self-supporting metal material jacket ( 22 ).
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