Highly Crimped Conjugated Fiber Cheese Package and Process for Its Production

摘要

A highly crimped conjugate fiber cheese package which is obtained by layering on a paper bobbin a conjugate fiber consisting of a plurality of single filament composed of polytrimethylene terephthalate components having different intrinsic viscosities and consisting of at least 90 mol % of a trimethylene terephthalate unit and no more than 10 mol % of another ester repeating unit and laminated to each other in a side-by-side type, the cheese package being characterized by satisfying the following conditions (1)-(4). (1) The single filament composing the conjugate fiber has cross-sectional shape which is flat cross-section with a flatness of 1.1-3 as the ratio between the long axis and short axis. (2) The developed crimp elongation of the conjugate fiber is 30-200%. (3) The relationship between the contact area (compressed net area) S (cm2) between the paper bobbin and conjugate fiber and the wound weight W (kg) satisfies the following formula (1): <?in-line-formulae description="In-line Formulae" end="lead"?>2<=W<=0.02S (Formula 1)<?in-line-formulae description="In-line Formulae" end="tail"?> where 240<=S<=1000 (4) The package density of the conjugate fiber cheese package is 0.92-1.05 g/cm3.