Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1985-11-22
1987-04-28
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
428224, 428288, 428297, 428398, 604358, 604365, 604366, 604384, B32B 512
Patent
active
046613900
ABSTRACT:
A polymeric fibrous sheet is provided in the form of a composite of an open matrix of coarse fibers extending throughout the sheet and integrated with cocrystallized, fine fibers spanning the open spaces within the matrix. This non-woven sheet is formed by applying a thin film of polymer solution to the top surface of a substrate undergoing agitation. The substrate can be continuous, such as a belt, agitated by applying oscillatory motion from an acoustic or pneumatic driver to the shafts carrying the cylindrical rollers for the belt. The agitation is at a level sufficient to develop a reciprocating flow field with a velocity gradient sufficient to uncoil and orient the polymer chains in solution and induce the growth of fibers. As the agitated solution cools, a sheet is formed as linear polymer chains crystallize. Residual solvent is removed and the sheet is then dried in the dryer. Sheets with higher fiber content and strength are produced by using substrates containing grooves, especially substrates containing a second set of grooves normal to the first set of grooves, formed by a pattern of raised protrusions. The sheet produced using the patterned substrate contains a network of coarse fibers which roughly replicate the pattern of the grooves.
REFERENCES:
patent: 4037010 (1977-07-01), Keller et al.
patent: 4440819 (1984-04-01), Rosser et al.
Bell James J.
Hughes Aircraft Company
Karambelas A. W.
Lachman Mary E.
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