Reversible, heat-set, elastic fibers, and method of making and articles made from same

Heat setting of fibres of the invention claims a can rotates, the outer fibre comprises: A. core, comprising elastic fibre, comprising a fibre base crosslinking, temperature control olefin polymer; And B. a part, which comprises inelastic fibre. Fibre by the following method heat setting: (a) is applied force drawing of the outer fibre to the periphery; fibre(b) is heated in the step (a) stretching out fibre is max olefin polymer the temperature of microcrystalline melting point and keeping a sufficient to react at least some time of the effective polymer; and(c) step (b) is drawn and a heating fibre cooling to the olefin polymer the temperature of microcrystalline melting point and keeping and a time of the polymer wavelength to; And removing the force from the periphery fibre.