Flat filaments provided with ribs and raw fibers for pile fabrics

Raw fibers for manufacture of a pile fabric, said raw fibers comprising:

• at least 10 wt. % of a first ribbed flat filament having a first substantially rectangular transverse cross-section, wherein said first ribbed flat filament includes:
• a flatness ratio (A/B) of 7 to 25, wherein A is a length of a longer side of said first substantially rectangular, transverse cross-section, and B is a length of a shorter side of said first substantially rectangular, transverse cross section;
• a fineness of 0.5 to 40 denier;
• at least one rib formed on said longer side, said at least one rib continuously extending in a longitudinal direction of said filament;
• each of said at least one rib having a width W and a height H, the number of said ribs on each longer side ranging from 1 to A/2W, said width W ranging from B/2 to 3B, and said height H ranging from B/2 to 2B;
• and
• not more than 90 wt. % of a second flat filament having a second substantially rectangular transverse cross-section, wherein said second flat filament includes:
• a flatness ratio (A'/B') of 5 to 25, A' being a length of a longer side of said second substantially rectangular, transverse cross-section, and B' being a length of a shorter side of said second substantially rectangular, transverse cross-section;
• and
• a fineness of 1 to 40 denier.

Raw fibers for a pile fabric, said raw fibers comprising:

• 20 to 60 wt. % of a first ribbed flat filament having a first substantially rectangular transverse cross-section, wherein said first ribbed flat filament includes:
• a flatness ratio (A/B) of 7 to 25, wherein A is a length of a longer side of said first substantially rectangular, transverse cross-section, and B is a length of a shorter side of said first substantially rectangular, transverse cross section;
• a fineness of 0.5 to 40 denier;
• at least one rib formed on said longer side, said at least one rib continuously extending in a longitudinal direction of said filament;
• each of said at least one rib having a width W and a height H, the number of said ribs on each longer side ranging from 1 to A/2W, said width W ranging from B/2 to 3B, and said height H ranging from B/2 to 2B;
• 20to 50 wt. % of a shrinkable fiber having a shrinkage factor of at least 15% and a fineness of 1 to 5 denier;
• and
• 60 wt % or less of a non-shrinkable fiber.