US4280860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing nonwoven fabrics composed of crimped filaments
Assignee: Georgia Pacific Consumer Products LP
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Filing: 1979-11-02
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Granted: 1981-07-28
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Expires: 1999-11-02
Abstract
Abstract An improved process for making point-bonded nonwoven fabric composed of crimped filaments is described. The process involves melt spinning a side-by-side bicomponent filament which develops crimp at precisely the right instant so as to provide a uniform, high quality nonwoven fabric having a soft hand and other desirable apparel qualities.
Inventors
- 👤 Hsiang-Sheng Shen
- 👤 LeMoyne W. Plischke
- 👤 William M. Baggett
- 👤 Franklin T. Osborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:50
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2929
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
A process for preparing a point-bonded, nonwoven fabric having apparel-like qualities comprising: (1) melt spinning side-by-side bicomponent filaments in which both components are composed of the same polymer and one component contains at least 500 ppm of CaF 2 uniformly dispersed therein, with no CaF 2 in the other component, (2) quenching said filaments, (3) pneumatically attenuating said quenched filaments, (4) depositing said attenuated filaments onto a moving surface to form a web, (5) point-bonding said filaments to provide a nonwoven fabric, and (6) collecting said fabric wherein said steps (1) through (4) occur within a period of time less than 0.5 seconds and wherein the ratio of the two components and the amount of CaF 2 in said CaF 2 -containing component are correlated to provide filaments which without being heated develope at least 5 crimps per inch of non-extended length after being attenuated and prior to being deposited onto said moving surface.
Claim 2
Dependent Claim
154 words
A process for preparing a point-bonded, nonwoven fabric having apparel-like qualities comprising: (1) melt spinning side-by-side bicomponent filaments in which both components are composed of the same polymer and one component contains at least 500 ppm of CaF 2 uniformly dispersed therein, with no CaF 2 in the other component, (2) quenching said filaments, (3) pneumatically attenuating said quenched filaments, (4) depositing said attenuated filaments onto a moving surface to form a web, (5) point-bonding said filaments to provide a nonwoven fabric, and (6) collecting said fabric wherein said steps (1) through (4) occur within a period of time less than 0.5 seconds and wherein the ratio of the two components and the amount of CaF 2 in said CaF 2 -containing component are correlated to provide filaments which without being heated develope at least 5 crimps per inch of non-extended length after being attenuated and prior to being deposited onto said moving surface.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said polymer is polyhexamethylene adipamide.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein the filaments are of a non-round cross-section.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein the filaments are of a trilobal cross-section.
Claim 6
Dependent Claim
21 words
The process of claim 2 wherein the quenching of the filaments is assisted by means of a cross flow of air.
Claim 7
Dependent Claim
49 words
The process of claim 2 wherein the ratio of the two components and the amount of CaF 2 in the CaF 2 -containing component are correlated to provide filaments having a developed crimp level of at least 10 crimps per inch (393.7 crimps per meter) of non-extended filament length.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |