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US 4,256,686 AGranted
Method and device for the production of an oxide ceramic tube
AssigneeW. Haldenwanger KG
InventorsLeonhard E. Froschauer, Rudolf U. B. Knape, Dieter H. Schmidt
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Abstract
A device and a method for producing a closed end tube with the tube wall and the end being thereof one continuous piece. The tube is made in a repeatable process in such a way that the tube possesses uniform strength in all areas.
Claims1
A method for the production of an oxide ceramic tube which is completely closed at one end by a continuous process comprising the steps of:
- extruding plasticized oxide ceramic material through a screen and over a spike;
- closing a die having a hemisphere shape for forming the end;
- increasing a space associated with the die as the extrusion process continues which space is connected with the die cavity by means of a first venting hole;
- after complete formation of the closed end, moving the die downward and sideways to clear the tube;
- opening a second venting hole in the spike by retraction of a needle for the admission of air into the inside of the tube;
- and
- continuing extrusion of the tube to a desired length with the admission of air to the inside of the tube to prevent collapse of the tube.
4 more elements
Dependencies are inferred from the claim text.