| 摘要 |
COMPOSITIONS AND METHODS ARE DIRECTED TO A SHEATH CORE FIBER WITH A CORE AND A SHEATH THAT COMPRISES A FLUOROPOLYMER. COMTEMPLATED SHEATH MATERIALS INCLUDE PVDF, ECTFE, AND ETFE, AND MAY HAVE AN APPARENT SHEAR VISCOSITY EQUAL TO OR LESS THAN THE APPARENT SHEAR VISCOSITY OF THE CORE MATERIAL. ESPECIALLY COMTEMPLATED SHEATHS HAVE A WIGHT OF 30OR LESS OF THE WEIGHT OF THE FIBER. PREFERRED FIBERS ARE SPUN IN A SPIN PACK HAVING A SHEATH MATERIAL CONDUIT WITH A RATIO OF OPEN VOLUME TO SHEATH MATERIAL MASS FLOW OF LESS THAN 0.75 FOR A FIBER WITH A 30wtHEATH, OF LESS THAN 1.15 FOR A FIBER WITH A 20wtHEATH, AND OF LESS THAN 2.30 FOR A FIBER WITH A 10wtHEATH. |
