Stock material or miscellaneous articles – Sheet including cover or casing
Patent
1994-01-06
1996-03-12
Ahmad, Nasser
Stock material or miscellaneous articles
Sheet including cover or casing
428 70, 428 71, 428 74, 428 76, 4283173, 4283188, 4284735, 428906, 5278318, 5278319, 527941, B32B 100
Patent
active
054984580
ABSTRACT:
A spiral core comprises successive convolutions of a rigidifying layer which are spaced with respect to each other and maintained in a spiral spaced relationship. Preferably, a spiral insulation layer, having convolutions intermediate the convolutions of the rigidifying layer and forming a laminate with the rigidifying layer, is also present in the spiral core. The insulation layer and the rigidifying layer are bonded together to maintain the laminate spirally wound. The rigidifying layer can be a sheet material that is bonded to the insulation layer or a bonding material that hardens to both form the rigidifying layer and bond the rigidifying layer to the insulation layer. The insulation layer is a flexible insulation material such as, fiber glass blanket, a mineral wool fiber blanket, a ceramic fiber blanket, a polyimide fiber blanket or a foam sheet.
REFERENCES:
patent: 3193426 (1965-07-01), Schafer
patent: 3731792 (1973-05-01), Rolston
patent: 3898763 (1990-02-01), Ferro
patent: 3900648 (1975-08-01), Smith
Ahmad Nasser
Quinn Cornelius P.
Schuller International, Inc.
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