Process for producing hollow extrudate for use in vacuum
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United States of America Patent
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May 9, 1989
Grant Date -
N/A
app pub date -
Jan 29, 1987
filing date -
Jan 31, 1986
priority date (Note) -
Expired
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Abstract
A hollow extrudate for use in a vacuum is produced by a process comprising the steps of hermetically closing the forward open end of a hollow shaped material immediately after extrusion from a billet, cutting the shaped material after a predetermined length thereof has been subsequently extruded and hermetically closing the cut end at the same time, and cutting off the closed ends. The billet is a composite material composed of a core of aluminum having a high purity of at least 99.9% and an aluminum alloy cladding. The extrudate obtained has an inner layer and an outer layer corresponding to the core and the cladding, respectively.
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