# US 2014/0190143 A1 · Dimensionally stable polyester yarn and preparation thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190143 A1 - Document ID: US20140190143A1 - Status: Published application - Kind: A1 - Application number: 14/117,498 - Filed: 2012-05-16 - Published: 2014-07-10 - Earliest claimed: 2011-05-18 - Assignees: Api Institute - Inventors: Bastiaan Krins; Jannes Veurink; Petrus Joannes Maria Oerlemans - Web page: https://patentgrep.com/patent/US20140190143A1 ## CPC - D02G 3/367: {using a drawing frame} - B60C 9/0042: {Reinforcements made of synthetic materials} - D01D 5/088: Cooling filaments, threads or the like, leaving the spinnerettes - D01D 5/16: using rollers, or like mechanical devices, e.g. snubbing pins - D01F 6/62: from polyesters - D02G 3/48: Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)} - D10B 2331/04: polyesters, e.g. polyethylene terephthalate [PET] - D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS - D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS - D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES ## Abstract A continuous spin-draw-winding process to prepare a drawn polyester yarn suitable for use in high-speed tires and run-flat tires having high energy to break in combination with a good dimensional stability, including extruding molten polyester through spinning holes in a spinneret to form a bundle of molten spun filaments, solidifying the spun filaments by a gaseous cooling medium, fixing the spinning speed of the solidified filaments at a first godet in the range of 4050 to 5000 m/min, drawing the solidified filaments at a draw ratio less than 1.75 to form drawn filaments. The drawn polyester yarn has a high amorphous orientation distribution, a high crystallinity and a coarse structure. Dipped cords including such polyester drawn yarns exhibit excellent dimensional stability at higher temperatures. ## Claims ### Claim 1 A method for producing drawn polyester yarn in a continuous spin-draw-winding process comprising extruding molten polyester through spinning holes in a spinneret to form a bundle of molten spun filaments, solidifying the spun filaments by a gaseous cooling medium, fixing the spinning speed of the solidified filaments at a first godet, drawing the solidified filaments to form drawn filaments and winding the drawn filaments as yarn wherein the spinning speed at the first godet is in the range of 4050 to 5000 m/min for DMT-based polyester or 4500 to 5500 m/min for PTA-based polyester, the draw ratio, defined as the maximum speed of the yarn in the spinning line over the spinning speed at the first godet, is less than 1.75 for DMT-based polyester or less than 1.60 for PTA-based polyester, and the spun filaments are solidified by a gaseous cooling medium in two cooling steps, wherein in the first cooling step the gaseous cooling medium flows transversely through the bundle of filaments and leaves the bundle of filaments substantially completely on the opposite side of the inflow and wherein in the second cooling step the filament bundle is cooled further through self-suction of a gaseous cooling medium surrounding the filament bundle. ### Claim 2 (depends on 1) The method for preparing drawn polyester yarn according to claim 1 wherein in the first cooling step the gaseous cooling medium is blown from at least one blowing device on the inflow side and sucked substantially completely out of the filament bundle by a sucking device on the opposite side of the inflow side. ### Claim 3 (depends on 2) The method for preparing a drawn polyester yarn according to claim 2 wherein the gaseous cooling medium in the first cooling step is blown transversely towards the filament bundle from at least one blowing device over a blowing length L1 along the filament bundle, and the gaseous cooling medium leaves the bundle of filaments substantially completely by suction over a suction length L2 along the filament bundle, wherein the ratio of the suction length L2 over the blowing length L1 is in the range of 0.13 to 0.33. ### Claim 4 (depends on 1) The method for preparing drawn polyester yarn according to claim 1 wherein the winding speed after drawing is in the range of 6800 to 8000 m/min. ### Claim 5 A drawn polyester yarn comprising polyester filaments wherein the drawn polyester yarn has an energy to break of at least 70 J/g and a dimensional stability, defined as the sum of EAST and HAS, in the range of 7.75 to 9.25%. ### Claim 6 (depends on 5) The drawn polyester yarn according to claim 5 wherein the drawn polyester yarn has a dimensional stability in the range of 7.75 to 8.75%. ### Claim 7 A drawn polyester yarn comprising polyester filaments wherein the drawn polyester yarn has an energy to break of at least 70 J/g and an amorphous orientation distribution factor of at least 1.40. ### Claim 8 (depends on 5) The drawn polyester yarn according to claim 5 wherein the drawn polyester yarn has an energy to break in the range of 70 to 100 J/g. ### Claim 9 (depends on 5) A polyester dipped cord comprising drawn polyester yarn according to claim 5 wherein the polyester dipped cord has an energy to break of at least 60 J/g and that the polyester dipped cord has a TASE 5% s.c.d.c, of at least 140 mN/tex at 20° C. ### Claim 10 (depends on 5) A polyester simulation cured dipped cord comprising drawn polyester yarn according to claim 5 wherein the polyester simulation cured dipped cord has an energy to break of at least 60 J/g and a TASE 5% s.c.d.c. of at least 140 mN/tex at 20° C. ### Claim 11 (depends on 10) The polyester simulation cured dipped cord according to claim 10 wherein the polyester simulation cured dipped cord has an energy to break in the range of 60 to 100 J/g. ### Claim 12 (depends on 10) The polyester simulation cured dipped cord according to claim 10 wherein the simulation cured dipped cord has a TASE 5% s.c.d.c. of at least 70 mN/tex at 120° C. ### Claim 13 (depends on 10) The polyester simulation cured dipped cord according to claim 10 wherein the simulation cured dipped cord has a TASE 5% s.c.d.c. of at least 60 mN/tex at 150° C. ### Claim 14 (depends on 8) A pneumatic tire comprising drawn polyester yarn according to claim 8. ### Claim 15 (depends on 9) A pneumatic tire comprising polyester dipped cord according to claim 9.