Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By treating occluded solids
Patent
1975-08-25
1978-11-14
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By treating occluded solids
15624419, 264103, 264141, 264147, 264171, 264211, 264310, 264DIG47, B29D 702
Patent
active
041255810
ABSTRACT:
Fibrous products, including single fibers, yarn and fibrous webs, of improved fineness are produced from extruded sheet material extruding in the form of a sheet-like, multi-layer composite stream a plurality of extrudable materials, at least one of which is a synthetic thermoplastic fiber-forming polymer and another of which is removable by mechanical, chemical, or solvent action or a combination thereof, which layers extend generally parallel to the faces of said stream, with each such layer containing either said fiber-forming polymer or said removable extrudable material with the different layers being interspersed in said composite stream; solidifying this composite stream into a multilayer sheet, then splitting the resultant solid sheet to convert the same into a coarse fibrous product, and treating the thus produced fibrous product by mechanical, chemical, or solvent action or a combination thereof to at least partially remove the removable extrudable material and produce a fibrous product of increased fineness. Instead of solidifying the extruded stream while intact, the stream can be divided during extrusion along spaced generally parallel planes extending through the stream at an angle to its faces and solidified in this divided state to form separate strips each containing a section of the multi-layer composite stream. These separate strips are then treated as indicated to at least partially remove the removable material and at least partially separate the polymeric layers therein.
REFERENCES:
patent: 3321804 (1967-05-01), Breidt, Jr. et al.
patent: 3565985 (1971-02-01), Schrenk et al.
patent: 3632711 (1972-01-01), Rasmussen
patent: 3950476 (1976-04-01), Fontijn
Daniel William J.
Thurlow Jeffery R.
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