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US 5,395,516 AGranted
Filtration system
AssigneeCourtaulds Fibres (Holdings) Limited
InventorGary E. G. Gray
Life of this patent
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AssigneeCourtaulds Fibres (Holdings) Limited
InventorGary E. G. Gray
Estimating the term…
A filtration system for filtering dope of a solvent-spun fiber manufacturing plant in which dope to be spun flows from a source of supply (10) through a series of filter assemblies (15) (21) (23) to jets (22(b)) of each spinning heads (22). The filtration system comprises, in flow series, a first stage filter assemblies (15) having filter elements with the finest pore size of the series (typically 20.mu.) and a final stage filter assembly (23), immediately upstream of the jets (22(b)) of each spinning head (22). The final stage filter assembly is of the coarsest pore size of the series of filters (typically 80.mu.) and is equal to, or less than, the size of the jet holes (typically 80.mu.). The filter media of intermediate filter assemblies (21) between the first (15) and final (23) stages increase in pore size as one progresses from the first filter assembly (15) to the final filter assemblies (23) along the flow path.
In a solvent-spun fiber manufacturing process in which dope to be spun into fiber is caused to flow from a source of supply to a spinning head having a plurality of spinerette jet holes of predetermined diameter, a filter system for filtering said dope between said source of supply and said spinning head, said system comprising a series of at least two filter assemblies of different pore sizes, the pore size of the assembly in said series nearest the source of supply being the smallest of the series and the pore size of the assembly nearest the spinning head being at most equal to the diameter of the jet holes of said spinning head.
Dependencies are inferred from the claim text.