| 摘要 |
Stiff cords especially useful for reinforcing V-belts are made from yarns formed of extruded filaments. Almost all of the filaments have a core and a complete sheath. The proportion of sheathed filaments, A in percent to all of the sheathed filaments in the yarn, in which the proportion of the sheath in each sheathed filament is (M+/-0.1) percent of the total volume of the sheathed filament, simultaneously satisfies the conditions A</=100; M>/=0.5; A>/=30+(0.1 M)8. The sheath is formed of a polymer having a melting point at least 10 DEG C. below the melting point of the polymer forming the core. One such sheathed filament has a core formed of polyethylene terephalate and a sheath formed of a copolymer of polyethylene terephalate and sulfoisophthalic acid.
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