D - Textiles – Paper – 02 – J
Patent
D - Textiles, Paper
02
J
D02J 1/22 (2006.01) D02J 13/00 (2006.01)
Patent
CA 2100205
Abstract Process for drawing heated yarns, thereby obtainable polyester fibers, and use thereof. There is described a particularly gentle and fast process for heating and drawing yarns passing contactlessly through a heating apparatus at high speed. The process comprises the measures of: i) preheating a heat transfer gas to a temperature which is above the desired yarn temperature, and ii) feeding the preheated heat transfer gas into the yarn duct 80 that it impinges essentially perpendicularly on the moving yarn along a length such that the yarn heats up to the desired elevated temperature within the heating apparatus, the length of the impingement zone being such that continuous removal of the boundary layer by the impinging heat transfer gas ensures that the yarn comes into direct contact with the heat transfer gas and thus heats up very rapidly, and iii) tensioning the yarn moving contactlessly through the heating apparatus in such z way that it undergoes drawing as it passes through said heating apparatus. The invention further relates to polyester fibers having the following properties: a tenacity index TI equal to or greater than 50 and a molecular orientation MO equal to or greater than 20 or a compliance COM equal to or less than 12 and a storage modulus index SMI equal to or greater than 100, where TI = a1 * T - a2 * BE - a2 * S, MO = a3 * SS - a2 * BE - a2 * S, COM = a2 * BE + a2 * S - a4 * CAO, and SMI = a1 T - 4 * (a2 * BE + a2 * S) + A4 * CAO + a3 * SS - a2 * DC, in which a1 = 1 * (tex/cN), a2 = 1 * (1/%), a3 = 10 * (sec/km) and a4 = 10 * (1/%), T is the tenacity in cN/tex, BE is the breaking extension in %, S is the shrinkage in % measured at 200°C in a through-circulation oven, SS is the speed of sound in km/sec measured at 25°C, CAO is the crystallite axial orientation in % expressed by the Hermann orientation function, and DC is the degree of crystallization in % measured by the method of the density gradient column. The polyester fibers of the invention can be used in particular for reinforcing plastics or for producing dimensionally stable textile fabrics.
Geirhos Josef
Jacob Ingolf
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Hoechst Aktiengesellschaft
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