Highly coherent and rigid synthetic multifilamentary yarn and process for manufacturing the same
AssigneeMitsubishi Rayon Co., Ltd.
InventorsKenzo Kosaka, Toshio Horikawa, Minoru Uchida, Shin Morioka, Kunio Shibata, Eizi Takahashi
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Abstract
Highly coherent and rigid synthetic multifilamentary yarn of improved functional properties having a novel and unique configuration composed of multiple, retained, successive and alternate twist regions is manufactured by twisting thermoplastic fibers by a false-twisting means and at a high temperature selected with reference to the combined properties of the degree of the double refraction and the density of the material fiber.
Claims10
Highly coherent and rigid synthetic multifilamentary yarn of improved functional properties, composed of a single multifilamentary strand, comprising multiple alternate S- and Z-twist regions of irregular lengths formed by false twisting and retained successively along the yarn length, some of the component filaments of said yarn being partially fused and adhered to each other and the extent of fusing and adhesion and the number of twists of each of the regions having twists of the same direction as the twisting direction being greater than those of the regions having twists of the opposite direction to said twisting direction.
A process for manufacturing a synthetic multifilamentary yarn having multiple alternate S- and Z- twist regions retained successively along the yarn length, which process comprises
- 1. supplying the multifilament yarn to a false-twisting apparatus,
- 2. passing the yarn through a heating zone having a temperature defined in .degree.C by the equation:
- .rho. + 10 .DELTA.n .ltoreq. 0.015 T - 0.800
- and
- T .ltoreq. 260
- wherein .rho. is density of the material in g/cm.sup.3 and .DELTA.n is degree of double refraction of said material filament, the individual filaments of the yarn being softened and partially melted such that regions are formed wherein the filaments are intermitently fused and adhered to each other in a twisting direction,
- 3. passing the yarn in a heated condition through the false-twisting apparatus, whereby regions are formed after passing through the apparatus wherein the individual filaments are substantially unfused and are twisted in a direction opposite to the twisting direction, and
- 4. recovering the resulting yarn.
Dependencies are inferred from the claim text.