Process for preparing poly(tetramethylene terephthalate) yarn
There is provided a process for preparing yarn comprised of at least 83 percent (by weight) of poly(tetramethylene) terephthalate with a spun denier per filament of from about 0.6 to about 50 from a polymer with a relative viscosity of from about 10 to about 50. In said process filaments of said pol...
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| creator | PATTERSON JOSEPH H |
| description | There is provided a process for preparing yarn comprised of at least 83 percent (by weight) of poly(tetramethylene) terephthalate with a spun denier per filament of from about 0.6 to about 50 from a polymer with a relative viscosity of from about 10 to about 50. In said process filaments of said polymer are extruded through a spinnerette at a spinning temperature of from about 240 to about 280 degrees centigrade, and the extruded filaments are taken up at a windup speed of from about 1000 to about 10,000 feet per minute; during said extrusion, the spinning threadline tension per extruded filament (as measured about 70 inches from the face of the spinnerette) is at least 0.09 grams per filament. Thereafter the extruded filaments are drawn in one or more stages to a draw ratio of from about 1.0 to about 5.0 and, during the drawing step, the filaments are passed over a heated object at a temperature of from about 60 to about 180 degrees centigrade. |
| format | Patent |
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In said process filaments of said polymer are extruded through a spinnerette at a spinning temperature of from about 240 to about 280 degrees centigrade, and the extruded filaments are taken up at a windup speed of from about 1000 to about 10,000 feet per minute; during said extrusion, the spinning threadline tension per extruded filament (as measured about 70 inches from the face of the spinnerette) is at least 0.09 grams per filament. 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In said process filaments of said polymer are extruded through a spinnerette at a spinning temperature of from about 240 to about 280 degrees centigrade, and the extruded filaments are taken up at a windup speed of from about 1000 to about 10,000 feet per minute; during said extrusion, the spinning threadline tension per extruded filament (as measured about 70 inches from the face of the spinnerette) is at least 0.09 grams per filament. 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In said process filaments of said polymer are extruded through a spinnerette at a spinning temperature of from about 240 to about 280 degrees centigrade, and the extruded filaments are taken up at a windup speed of from about 1000 to about 10,000 feet per minute; during said extrusion, the spinning threadline tension per extruded filament (as measured about 70 inches from the face of the spinnerette) is at least 0.09 grams per filament. Thereafter the extruded filaments are drawn in one or more stages to a draw ratio of from about 1.0 to about 5.0 and, during the drawing step, the filaments are passed over a heated object at a temperature of from about 60 to about 180 degrees centigrade.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING TEXTILES |
| title | Process for preparing poly(tetramethylene terephthalate) yarn |
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