Chisso Corporation

Hideo Matsuda

Shigeru Goi

Kazuyoshi Nakazawa

Polyolefin/polyester composite fibers having a low apparent Young's modulus and a filter element using the composite fibers are produced by subjecting a polyolefin as sheath component and a polyester as core component to composite spinning, stretching the resulting unstretched filaments to twice or more the original length at a temperature higher than the secondary transition point of the polyester by 20.degree. C. or higher and lower than the melting point of the polyolefin and annealing the stretched filaments at the above-mentioned temperature for 30 seconds or more, and having an apparent Young's modulus of 210 Kg/cm.sup.2 or less, and by winding up the above composite fibers on a core while heating the composite fibers to the melt-adhesion temperature of the sheath component, adjusting the void content to a desired one, followed by cooling and taking out the core.

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Moriyama, Japan

Hideo Matsuda