US4151023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of a nonwoven fabric
Assignee: BP Corp North America Inc
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Filing: 1977-06-06
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Granted: 1979-04-24
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Expires: 1997-06-06
Abstract
Abstract A nonwoven fabric is produced by forming a batt comprising staple fibers oriented primarily in the fill direction, drafting the batt in the warp direction in a first warp-drafting zone, needling the drafted batt, drafting the needled batt in the warp direction in a second warp-drafting zone, and drafting the warp-drafted, needled batt in the fill direction in a fill-drafting zone. A fabric, apparatus for producing the fabric, and a method for fusing a nonwoven batt are provided.
Inventors
- 👤 Louis Platt
- 👤 Marvin Wishman
- 👤 David R. Gentry
- 👤 Jake E. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:59
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/48; D04H1/54; D04H1/70; D04H1/74; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/2395; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/666; Y10T442/667; Y10T442/69
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
A method for fusing the fibers of a nonwoven batt of synthetic fibers having a longitudinal direction and a transverse direction wherein the depth of fusion is controlled and the integrity of the fibers' cross-section is maintained after fusion comprising subjecting at least one side of the batt to infrared radiation to melt and fuse the fibers together until the desired depth of fusion is obtained wherein the nonwoven batt comprises synthetic fibers oriented primarily in the transverse direction and the batt is subjected to tension in said transverse direction simultaneously with infrared irradiation.
Claim 2
Independent Claim
94 words
A method for fusing the fibers of a nonwoven batt of synthetic fibers having a longitudinal direction and a transverse direction wherein the depth of fusion is controlled and the integrity of the fibers' cross-section is maintained after fusion comprising subjecting at least one side of the batt to infrared radiation to melt and fuse the fibers together until the desired depth of fusion is obtained wherein the nonwoven batt comprises synthetic fibers oriented primarily in the transverse direction and the batt is subjected to tension in said transverse direction simultaneously with infrared irradiation.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the synthetic fibers are selected from the group consisting of polyolefins, polyesters, polyamides and mixtures thereof.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the synthetic fibers are polypropylene.
Claim 5
Dependent Claim
33 words
The method of claim 1 wherein the synthetic fibers are polypropylene staple having a length ranging from about 11/2 to about 10 inches and a denier ranging from about 1 to about 20.
Claim 6
Dependent Claim
59 words
The method of claim 1 wherein the synthetic fibers are polypropylene staple having a length ranging from 21/2 to about 4 inches, a denier ranging from about 1.5 to about 8, and fibers are fused together throughout the entire thickness of the batt leaving nap on the side of the batt opposite the side subjected to the infrared radiation.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |