Polyester yarn and process for producing
a polymer yarn and process technology, applied in the field of polymer yarns, can solve the problems of instability of partially oriented yarns, limited usefulness of multi-filament ptt partially oriented yarns, and many practical problems
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example 1
[0079] Partially oriented PTT multi-filament yarns were prepared in accordance with the process of the present invention at take-up speeds of 3500 m / min, 4000 m / min, and 4500 m / min and measured for crystallinity, birefringence, crystal orientation function, and heat of fusion. PTT polymer having an intrinsic viscosity of 0.92 dl / g was dried at 130° C. with a hot air dryer for 6 hours to a moisture content of less than 30 ppm. The hot air had a dew point of less than -60° C. The dried polymer was melted and extruded using a 30:1 L / D 1-inch single screw extruder at 260° C. with a 50 hole spinneret. The extruded fibers were quenched with quench air having a temperature of 16° C. to a yarn temperature less than 50° C., passed through a pair of unheated godet rolls in the form of an S-wrap, and wound up with a Barmag SW 46SSD winder to produce a 150 denier yarn. One yarn was spun with the godet rolls taking-up the yarn at a take-up speed 3500 m / min, another was spun at a take-up speed of...
example 2
[0081] The boil-off shrinkage after thirty days of the yarns prepared in Example 1 was measured to determine the shrink capacity of the yarns after aging. The yarns were wound and stored under ambient conditions for thirty days after formation of each yarn. The boil-off shrinkage of each yarn was measured after storage for 30 days. The boil-off shrinkage was measured in accordance with the process set forth above defining the term “boil-off shrinkage”. The boil-off shrinkage after thirty days for each yarn is shown in Table 2 below.
TABLE 2Take-up Speed (m / min)30 Day Boil-Off Shrinkage (%)350054000845005
[0082] The 30 day boil-off shrinkage results show that PTT partially oriented yarns prepared in accordance with the process of the present invention are subject to little shrinkage after aging.
example 3
[0083] A partially oriented PTT yarn spun with godet rolls taking up the yarn at a take-up speed of 4000 m / min was prepared in accordance with the process of the present invention, and the boil-off shrinkage of the yarn was measured from the initial formation of the yarn to thirty days from the initial formation of the yarn to determine the shrink-stability of the yarn. PTT polymer having an intrinsic viscosity of 0.92 dl / g was dried to less than 30 ppm moisture, and then was melted and extruded at 255° C. using a 50 mm diameter barrier screw extruder with a L / D ratio of 25 / 1 through a spinneret having 0.3 mm diameter die holes into 36 filament fibers. The fibers were quenched at a temperature of 21° C. to a yarn temperature of less than 50° C., passed through a pair of unheated godet rolls in the form of an S-wrap, and wound up with a Teijin-Sekki winder to produce an 85 denier yarn. The yarn was spun with the godet rolls taking-up the yarn at a take-up speed of 4000 m / min. Within ...
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Abstract
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