US4324752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a fused fabric
Assignee: BP Corp North America Inc
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Filing: 1979-12-31
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Granted: 1982-04-13
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Expires: 1999-12-31
Abstract
Abstract In a process for producing a fused fabric a fluid is passed in contact with the surface of a fabric on the surface opposite that exposed to sufficient infrared radiation to fuse at least a portion of the synthetic thermoplastic fibers which comprise at least a portion of the fabric.
Inventors
- 👤 Richard C. Newton
- 👤 Gerald A. Romanek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:07
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; B; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0822; B29C65/00; B29C65/02; B29C65/14; B29C65/1403; B29C65/1412; B29C65/1429; B29C65/1464; B29C66/00; B29C66/69; B29C66/70; B29C66/72; B29C66/729; B29C66/7294; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
176 words
A process for the controlled fusing of at least a portion of the synthetic thermoplastic fibers in an unfused fabric, having a first and second surface, to produce a fused fabric having a uniform appearance and a soft hand, said process comprising the steps of: exposing a portion of the first surface of said unfused fabric to infrared radiation to thereby fuse at least a portion of said synthetic thermoplastic fibers together; and directing a fluid towards a portion of the second surface of said unfused fabric, which is directly opposite the portion of the first surface of said unfused fabric which is exposed to said infrared radiation, in such a manner that at least a portion of said fluid passes completely through said unfused fabric so as to prevent overfusing of said synthetic thermoplastic fibers by said infrared radiation, the exposing of a portion of the first surface of said unfused fabric to said infrared radiation occurring simultaneously with the directing of said fluid towards the portion of the second surface of said unfused fabric.
Claim 2
Dependent Claim
176 words
A process for the controlled fusing of at least a portion of the synthetic thermoplastic fibers in an unfused fabric, having a first and second surface, to produce a fused fabric having a uniform appearance and a soft hand, said process comprising the steps of: exposing a portion of the first surface of said unfused fabric to infrared radiation to thereby fuse at least a portion of said synthetic thermoplastic fibers together; and directing a fluid towards a portion of the second surface of said unfused fabric, which is directly opposite the portion of the first surface of said unfused fabric which is exposed to said infrared radiation, in such a manner that at least a portion of said fluid passes completely through said unfused fabric so as to prevent overfusing of said synthetic thermoplastic fibers by said infrared radiation, the exposing of a portion of the first surface of said unfused fabric to said infrared radiation occurring simultaneously with the directing of said fluid towards the portion of the second surface of said unfused fabric.
Claim 3
Dependent Claim
64 words
A process in accordance with claim 1 wherein said unfused fabric is a non-uniform fabric having varying thicknesses and wherein the flow of said fluid is greater through the thinner areas of said unfused fabric than through the thicker areas of said unfused fabric to substantially prevent said infrared radiation from overfusing the synthetic thermoplastic fibers in the thinner areas of said unfused fabric.
Claim 4
Dependent Claim
15 words
A process in accordance with claim 1 wherein said unfused fabric is a nonwoven fabric.
Claim 5
Dependent Claim
25 words
A process in accordance with claim 1 wherein said synthetic thermoplastic fibers are selected from the group consisting of polyolefins, polyamides, polyesters and mixtures thereof.
Claim 6
Dependent Claim
16 words
A process in accordance with claim 1 wherein said unfused fabric is a polypropylene nonwoven fabric.
Claim 7
Dependent Claim
15 words
A process in accordance with claim 1 wherein said fluid is air at ambient temperature.
Claim 8
Dependent Claim
29 words
A process in accordance with claim 6 wherein the air is directed toward said first surface of said unfused fabric at an acute angle relative to said first surface.
Claim 9
Dependent Claim
22 words
A process in accordance with claim 6 wherein the air is directed in an essentially perpendicular direction relative to said first surface.
Claim 10
Dependent Claim
31 words
A process in accordance with claim 8 wherein said unfused fabric is stretched at least in a first direction immediately prior to, during and immediately after fusing said synthetic thermoplastic fibers.
Claim 11
Dependent Claim
31 words
A process in accordance with claim 9 wherein said unfused fabric is a polypropylene nonwoven fabric having been previously produced by crosslapping webs of polypropylene staple and needling the webs together.
Claim 12
Dependent Claim
11 words
The fused fabric produced according to the process of claim 10.
Claim 13
Dependent Claim
11 words
The fused fabric produced according to the process of claim 1.
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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |