US3707837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrillation process
Assignee: Celanese Corp
•
Filing: 1970-09-09
•
Granted: 1973-01-02
•
Expires: 1990-09-09
Abstract
Abstract There is provided a commercial process for fibrillating a fibrillatable tape at windup speeds in excess of 500 feet per minute. In this process the tape is subjected to the action of at least four fluid twisting means wherein the direction of twist imparted to the tape is completely and sharply reversed between adjacent twisting means and the tape is advanced from one fluid twisting means to another while being maintained under a tension of from about 0.05 to about 0.2 grams per denier.
Inventors
- 👤 J Gibbon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:23
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10S57/00; Y10S57/907
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A process for fibrillating a fibrillatable tape at a throughput speed of greater than 500 feet per minute comprising the steps of: a. subjecting a travelling fibrillatable tape to at least four fluid twisting means; b. tensioning said travelling fibrillatable tape so that it is under a tension of from about 0.05 to about 0.2 grams per denier while being subjected to said fluid twisting means; and c. contacting said tape with a vortex of whirling fluid in each of said twisting means, wherein said vortex of whirling fluid rotates around the axis of travel of the tape and the direction of rotation of the vortices is opposite in adjacent twisting means, whereby the direction of twist imparted to the tape is completely reversed between adjacent twisting means.
Claim 2
Dependent Claim
128 words
A process for fibrillating a fibrillatable tape at a throughput speed of greater than 500 feet per minute comprising the steps of: a. subjecting a travelling fibrillatable tape to at least four fluid twisting means; b. tensioning said travelling fibrillatable tape so that it is under a tension of from about 0.05 to about 0.2 grams per denier while being subjected to said fluid twisting means; and c. contacting said tape with a vortex of whirling fluid in each of said twisting means, wherein said vortex of whirling fluid rotates around the axis of travel of the tape and the direction of rotation of the vortices is opposite in adjacent twisting means, whereby the direction of twist imparted to the tape is completely reversed between adjacent twisting means.
Claim 3
Dependent Claim
82 words
The process of claim 1, wherein: a. the first fluid twisting means said tape is subjected to is no further than 3 inches away from the second fluid twisting means said tape is subjected to, and the third fluid twisting means said tape is subjected to is no further than 3 inches away from the fourth fluid twisting means said tape is subjected to; and b. said second and third fluid twisting means are from about 6 to about 1000 inches apart.
Claim 4
Dependent Claim
71 words
The process of claim 2, wherein: a. the fluid supplied to said twisting means is air, b. from about 10 to about 250 p.s.i.g. of air pressure are supplied to each of said twisting means, whereby, the velocity of said air in said twisting means is from about 0.5 to about 1.0 sonic velocity, and c. said fibrillatable tape is comprised of at least 90 percent (by weight) of poly(ethylene terephthalate)
Claim 5
Dependent Claim
106 words
The process of claim 3, wherein: a. said fibrillatable tape is maintained at a tension of from about 0.05 to about 0.15 grams per denier; b. from about 20 to about 100 p.s.i.g. of air pressure are supplied to each of said twisting meaNs; c. said first fluid twisting means is no further than about 1 inch away from said second fluid twisting means, and said third fluid twisting means is no further than about 1 inch away from said fourth fluid twisting means; and d. said second fluid twisting means is from about 12 to about 500 inches away from said third fluid twisting means.
Claim 6
Dependent Claim
60 words
The process of claim 4, wherein: a. said fibrillatable tape is maintained at a tension of about 0.1 grams per denier, b. from about 40 to about 80 p.s.i.g. of air pressure are supplied to said twisting means, and c. said second fluid twisting means is from about 15 to about 72 inches away from said third fluid twisting means.
References Cited (Backward Citations)
US3125793A
Cited
US3116588A
Cited
US3303169A
Cited
US3214899A
Cited
US3395525A
Cited
NL6912566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |