Screw-type extrusion machine having tie rods loaded by a pre-stressed spring system
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United States of America Patent
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Jan 18, 2000
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N/A
app pub date -
Sep 11, 1998
filing date -
Sep 17, 1997
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Abstract
In a screw-type extrusion machine comprising a composite casing which comprises casing sections fitted together in a longitudinal direction, the casing sections being tightly tautened relative to each other by a plurality of tie rods which extend parallel to each other in the longitudinal direction of the casing on the outside thereof, it is provided with a view to avoiding any over-stressing of the tie rods in the hot condition and to avoiding any leakage between the casing sections in the case of low temperatures and non-uniform temperature distribution, that the tie rods are loaded in the longitudinal direction by a pre-stressed spring system.
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