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US 4,093,193 AGranted
Composite high temperature protection tube
AssigneeElectro-Nite Co.
InventorsJohn E. Cassidy, Max H. Kraus
Life of this patent
Estimating the term…
Abstract
The composite tube has an inner core of a first material, an intermediate zone of a second material surrounding said core, and an outer wrap surrounding and confining said intermediate zone. The intermediate zone is spirally wound layers of ceramic paper bonded together. The tube is light in weight and has a very low thermal conductivity.
Claims13
A composite high temperature protection tube, comprising:
- (a) an inner core of a first material,
- (b) an intermediate zone surrounding said core and being of a different material, said intermediate zone being supported by said core, said intermediate zone being spirally wound layers of ceramic paper bonded together, said ceramic paper being inorganic and having an organic binder in amounts sufficient to increase the tear strength thereof so that said ceramic paper may be unwound from a roll by pulling on an unwound portion thereof, said ceramic paper having a thermal conductivity less than 2 BTU-in./hr.Ft..sup.2 .degree. F. at a mean temperature of 2000.degree. F,
- (c) an outer wrap bonded to itself along overlapping side edges and spirally wound around and confining said intermediate zone.
A method of making a composite high temperature tube comprising:
- (a) providing an inner core of a first material,
- (b) surrounding said core with a zone of a different material including spirally wound layers of ceramic paper having superimposed layers bonded together and being inorganic except for an organic binder in an amount sufficient to increase the tear strength of said paper, said step of surrounding said core including unwinding said ceramic paper in the form of a narrow strip from a roll with the axis of the the roll being at an acute angle with respect to a mandrel of a spiral tube machine,
- (c) confining said layers of said ceramic paper while on said mandrel by an outer wrap spirally wound therearound and bonded to itself along overlapped side edge portions,
- (d) cutting the thusly formed tube into unit lengths, and then
- (e) curing the bond between the juxtaposed layers of said ceramic paper while confined by said inner core and outer wrap.
2 more elements
Dependencies are inferred from the claim text.