Patent US4187343A successfully refreshed from Google Patents.
US4187343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing non-woven fabric
Assignee: Toyobo Co Ltd
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Filing: 1976-10-08
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Granted: 1980-02-05
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Expires: 1996-10-08
Abstract
Abstract A process for producing a non-woven fabric having excellent draping properties and strength and further having a handling similar to that of woven fabrics, which comprises drawing uniaxially or biaxially a non-woven sheet material comprising not less than 90% by weight of semi-drawn fibers of a linear high molecular weight compound (e.g. polyesters) having a breaking elongation of 80 to 150% wherein the fibers of said sheet material are crossed and intertwined with each other and are partially bonded at the crossing points, said drawing being carried out until the bonding of the fibers is partially broken or the fibers are partially cut.
Inventors
- 👤 Takashi Akiyama
- 👤 Akinori Tanji
- 👤 Seiichi Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:54
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/69
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A process for producing a non-woven fabric, which comprises drawing uniaxially or biaxially a non-woven sheet material comprising not less than 90% by weight of semi-drawn aromatic polyester fibers produced by melt spinning the polyester obtained from an aromatic dicarboxylic acid and an alkaline glycol wherein not less than 80% by mol of the component unit of the polyester is an ethylene terephthalate chain, said fibers having a breaking elongation of 80 to 150% wherein the fibers are crossed and intertwined with each other and are partially bonded at the crossing points, said drawing being carried out until the bonding of the fibers is partially broken or the fibers are partially cut.
Claim 2
Dependent Claim
112 words
A process for producing a non-woven fabric, which comprises drawing uniaxially or biaxially a non-woven sheet material comprising not less than 90% by weight of semi-drawn aromatic polyester fibers produced by melt spinning the polyester obtained from an aromatic dicarboxylic acid and an alkaline glycol wherein not less than 80% by mol of the component unit of the polyester is an ethylene terephthalate chain, said fibers having a breaking elongation of 80 to 150% wherein the fibers are crossed and intertwined with each other and are partially bonded at the crossing points, said drawing being carried out until the bonding of the fibers is partially broken or the fibers are partially cut.
Claim 3
Dependent Claim
49 words
The process according to claim 1 wherein the partial bonding of the fibers at the crossing points is carried out under heat and pressure at a temperature higher than the second-order transition temperature of the polyester and at least 60° C. lower than the melting point of the polyester.
Claim 4
Dependent Claim
21 words
The process according to claim 1, wherein the drawing is carried out at a draw ratio of 1.1 to 2.0 times.
Claim 5
Dependent Claim
44 words
The process according to claim 1, wherein the drawing is carried out at a temperature of at least 10° C. higher than the second-order transition temperature of the polyester fiber and at least 50° C. lower than the melting point of the polyester fiber.
Claim 6
Dependent Claim
31 words
A non-woven fabric having excellent draping properties and strength and having a handling similar to that of woven fabrics, which is produced by the process as set forth in claim 1.
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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) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |