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US3858386A Expired / Lapsed US ⏱️ 0.0 years remaining

Polyester yarn production

Assignee: Celanese Corp
•
Filing: 1971-07-06
•
Granted: 1975-01-07
•
Expires: 1991-07-06
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Abstract

Abstract A method and apparatus are disclosed for the production of a novel industrial polyester filament yarn of improved uniformity wherein a plurality of filaments are melt-spun into a heated zone coupled with controlled cooling. The yarn produced has improved long and short term Uster uniformity and improved uniformity of physical properties, particularly breaking strength, as shown by a reduced standard deviation of breaking strength. The yarn is produced by melt spinning into a heated zone which maintains the filaments molten for intervals below the spinneret face and subsequently quenching the filaments with a radial outflow of cooling gases, thereby producing a low birefringence yarn which is capable of being drawn at high draw ratios to high tenacities.

Inventors

  • 👤 Richard H Stofan

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 18:35
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01D5/088; D01F; D01F6/00; D01F6/58; D01F6/62; Y; Y10; Y10S; Y10S57/00; Y10S57/902; Y10S57/903; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/298

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 56 words
A heavy denier melt spun polyester filament yarn having a tenacity of more than 7.0 grams per denier, a long and short term percent Uster of less than 1.5, a tensile factor of more than 28, and a breaking strength standard deviation of less than 0.20 grams per denier as measured in yarns across a beam.
Claim 2
Dependent Claim 56 words
A heavy denier melt spun polyester filament yarn having a tenacity of more than 7.0 grams per denier, a long and short term percent Uster of less than 1.5, a tensile factor of more than 28, and a breaking strength standard deviation of less than 0.20 grams per denier as measured in yarns across a beam.
Claim 3
Dependent Claim 56 words
A HEAVY DENIER MELT SPUN POLYESTER FILAMENT YARN HAVING A TENACITY OF MORE THAN 7.0 GRAMS PER DENIER, A LONG AND SHORT TERM PERCENT USTER OF LESS THAN 1.5 A TENSILE FACTOR OF MORE THAN 28, AND A BREAKING STRENGTH STANDARD DEVIATION OF LESS THAN 0.20 GRAMS PER DENIER AS MEASURED IN YARNS ACROSS A BEAM.
Claim 4
Dependent Claim 56 words
A HEAVY DENIER MELT SPUN POLYESTER FILAMENT YARN HAVING A TENACITY OF MORE THAN 7.0 GRAMS PER DENIER, A LONG AND SHORT TERM PERCENT USTER OF LESS THAN 1.5 A TENSILE FACTOR OF MORE THAN 28, AND A BREAKING STRENGTH STANDARD DEVIATION OF LESS THAN 0.20 GRAMS PER DENIER AS MEASURED IN YARNS ACROSS A BEAM.
Claim 5
Dependent Claim 23 words
The heavy denier yarn of claim 1 whereiN the polyester is polyethylene terephthalate and the tenacity is greater than 8.0 grams per denier.
Claim 6
Dependent Claim 18 words
The heavy denier polyester yarn of claim 1 wherein the long term percent Uster is less than 1.0.
Claim 7
Dependent Claim 41 words
The heavy denier polyester yarn of claim 1 wherein the denier per filament is 3 to 20, the total denier is 500 to 5,000, the tenacity is 8 to 11 grams per denier and the tensile factor is more than 30.

References Cited (Backward Citations)

US3419060A Cited
US3365875A Cited
US3342027A Cited
US3670489A Cited
US3664114A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-01-06 1978-07-08 1979-01-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-01-06 1982-07-08 1983-01-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-01-06 1986-07-08 1987-01-07 $7700.00 Window Closed / Lapsed

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