Patent US4806300A successfully refreshed from Google Patents.
US4806300A
Expired / Lapsed
US
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Method for softening a nonwoven web
Assignee: Individual
•
Filing: 1987-05-29
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Granted: 1989-02-21
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Expires: 2007-05-29
Abstract
Abstract A thermoplastic nonwoven web is softened by stretching the web in the cross-machine direction, stretching the web in the machine direction, and shearing the surfaces of the web relative to each other. The resulting web has increased flexibility and increased surface nap which correlates with increased perceived softness.
Inventors
- 👤 Richard R. Walton
- 👤 George E. Munchbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:00
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/18; B29C55/10; B29C55/12; B29C55/14; B29C55/146; B29L; B29L2031/00; B29L2031/726; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
A method of softening a nonwoven thermoplastic web wherein the web is passed through two nips, the first nip being formed between two rolls having noncontacting intermeshing circumferential lands and grooves and which are rotating at about the same speed and the second nip being formed between two rolls having resilient surfaces with circumferential ridges and valleys and rotating at different speeds relative to each other.
Claim 2
Independent Claim
66 words
A method of softening a nonwoven thermoplastic web wherein the web is passed through two nips, the first nip being formed between two rolls having noncontacting intermeshing circumferential lands and grooves and which are rotating at about the same speed and the second nip being formed between two rolls having resilient surfaces with circumferential ridges and valleys and rotating at different speeds relative to each other.
Claim 3
Independent Claim
52 words
A method of softening a nonwoven thermoplastic web wherein the web is passed through at least one nip formed between two rolls having noncontacting intermeshing circumferential lands and grooves and rotating at different speeds relative to each other, the surfaces of the lands being of a nature to frictionally engage the web.
Claim 4
Independent Claim
52 words
A method of softening a nonwoven thermoplastic web wherein the web is passed through at least one nip formed between two rolls having noncontacting intermeshing circumferential lands and grooves and rotating at different speeds relative to each other, the surfaces of the lands being of a nature to frictionally engage the web.
Claim 5
Dependent Claim
17 words
The method of claim 2 wherein the surfaces of the lands contain a tungsten carbide plasma-blown coating.
Claim 6
Independent Claim
20 words
The method of claims 1 or 2 wherein the roll speed differential is from about 5 to about 40 percent.
Claim 7
Dependent Claim
23 words
The method of claim 1 or 2 wherein the intermeshing of the lands and grooves is from about 0.010 to about 0.060 inch.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |