B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/10, 25/131
B28B 3/20 (2006.01) B28B 11/24 (2006.01) B28B 21/52 (2006.01) C04B 33/00 (2006.01) C04B 35/00 (2006.01) F27D 3/02 (2006.01)
Patent
CA 2011190
CERAMIC TUBES AND THEIR MANUFACTURE Abstract Ceramic tubes (10) are manufactured from a mixture that includes ceramic powder. The mixture is extruded through a die (48) to form a tube (lo). The tube (10) is passed through an open- ended dryer (16), calciner (20), transition zone (22), sintering furnace (24), and cooler (26). Thereafter, the tube (10) is cut to the desired length (which may be very long). The quality of the tube (10) is enhanced by applying a vacuum to the mixture prior to extrusion. For tubes (10) made of non-oxide ceramics, an inert atmosphere is maintained both inside and outside the tube in all sections of the equipment that operate above 200°C. A controlled tension is applied to the tube (10) by means of first pinch rolls (13) disposed downstream of the dryer (16) and second pinch rolls (30) disposed downstream of the cooler (26).
Eucker James L.
Ruhl Robert C.
Ruppel Irving B. Jr.
Eucker James L.
Gowling Lafleur Henderson Llp
Ruhl Robert C.
Ruppel Irving B. Jr.
The Carborundum Company
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