US5023130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroentangled polyolefin web
Assignee: EIDP Inc
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Filing: 1990-08-14
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Granted: 1991-06-11
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Expires: 2010-08-14
Abstract
Abstract A process is disclosed for hydroentangling continuous polyolefin filament fibers to form a fabric web. The fibers are supported on a 60 to 150 mesh screen and passed under high pressure water jets operating at at least 2000 psi and providing a total impact energy of at least 0.7 MJ-N/Kg to entangle the fibers. Preferably, the hydroentangled web is thereafter passed under finer finishing water jets operating at a pressure of between 300 to 1200 psi to redistribute the fibers. If desired, a finish may be applied to the entangled web. The resulting hydroentangled web has considerably increased visual uniformity, opacity, softness, comfort, strength and barrier properties compared to prior art webs thereby making it particularly useful as a disposable industrial garment.
Inventors
- 👤 Penny C. Simpson
- 👤 Larry M. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:08
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/48; D04H1/49; D04H3/00; D04H3/02; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T442/00; Y10T442/60; Y10T442/689
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
67 words
A process for hydroentangling an unbonded, nonwoven polyolefin web comprising the steps of: (a) supporting a lightweight web of continuous polyolefin filament fibers on a fine mesh screen; and (b) passing the supported web underneath high energy water jets operating at a pressure of at least 2000 psi and providing a total impact energy of at least 0.7 MJ-N/Kg to entangle the web in a random manner.
Claim 2
Dependent Claim
67 words
A process for hydroentangling an unbonded, nonwoven polyolefin web comprising the steps of: (a) supporting a lightweight web of continuous polyolefin filament fibers on a fine mesh screen; and (b) passing the supported web underneath high energy water jets operating at a pressure of at least 2000 psi and providing a total impact energy of at least 0.7 MJ-N/Kg to entangle the web in a random manner.
Claim 3
Dependent Claim
31 words
A process according to claim 1 further comprising passing the hydroentangled web of step (b) underneath finishing water jets operating at 300 to 1200 psi to redistribute the randomly entangled fibers.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein the high energy jets operate at a pressure of at least 2100 psi.
Claim 5
Dependent Claim
25 words
A process according to claim 1 wherein the high energy jets provide a total impact energy of between 0.8 and 1.6 MJ-N/Kg to the web.
Claim 6
Dependent Claim
18 words
A process according to claim 1 further comprising the step of applying a finish to the hydroentangled web.
Claim 7
Dependent Claim
29 words
A process according to claim 5 wherein the finish is selected from the group consisting of hydrophilic finishes, hydrophobic finishes, disperse dyes, surface stabilizers, wetting agents and acrylic binders.
Claim 8
Dependent Claim
18 words
A process according to claim 1 wherein the web is supported on a 75 or 100 mesh screen.
Claim 9
Dependent Claim
14 words
A process according to claim 1 wherein the polyolefin web is comprised of plexifilaments.
Claim 10
Dependent Claim
11 words
A process according to claim 1 wherein the polyolefin comprises polyethylene.
Claim 11
Dependent Claim
14 words
An unbonded, nonwoven polyolefin web produced by the process of any of claims 1-9.
Claim 12
Dependent Claim
34 words
An unbonded, nonwoven hydroentangled polyolefin web having a strip tensile strength of at least 3.5 lbs/oz/yd 2 , an opacity of at least 90%, and an average pore size of less than 10 microns.
Claim 13
Dependent Claim
34 words
An unbonded, nonwoven hydroentangled polyolefin web having a strip tensile strength of at least 3.5 lbs/oz/yd 2 , an opacity of at least 90%, and an average pore size of less than 10 microns.
Claim 14
Dependent Claim
16 words
A hydroentangled web according to claim 11 further having a comfort rating of at least 5.0.
Claim 15
Dependent Claim
12 words
A hydroentangled web according to claim 11 wherein the polyolefin comprises polyethylene.
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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) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |