Patent US4921645A successfully refreshed from Google Patents.
US4921645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming microwebs and nonwoven materials containing microwebs
Assignee: 3M Co
•
Filing: 1989-01-04
•
Granted: 1990-05-01
•
Expires: 2009-01-04
Abstract
Abstract Microfiber microwebs are provided. The microfiber microwebs have relatively dense nuclei with individual fibers and/or fiber bundles protruding therefrom. The microfiber microwebs can be incorporated into nonwoven webs of blown microfibers, air-laid staple fibers, or wood pulp fibers as well as into shaped articles having porous covering materials. The microfiber microwebs are useful in sorbent, filtration, and thermal insulation materials. The microfiber microwebs are prepared by divellicating a microfiber web to form discrete particles of microfiber microwebs.
Inventors
- 👤 Thomas I. Insley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:40
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/531; A61F13/532; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4391; D04H1/04; D04H1/26; D04H1/54; D04H1/56; D04H1/58; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10S428/913; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23957; Y10T428/249921; Y10T428/25; Y10T428/253; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/619
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
46 words
A method for producing microfiber microwebs comprising (a) forming a microfiber web by melt blowing a thermoplastic fiber forming polymer; and (b) divellicating said microfiber web to form said microfiber microwebs, said microfiber microwebs having relatively dense microfiber nuclei with individual fibers and/or bundles protruding therefrom.
Claim 2
Independent Claim
46 words
A method for producing microfiber microwebs comprising (a) forming a microfiber web by melt blowing a thermoplastic fiber forming polymer; and (b) divellicating said microfiber web to form said microfiber microwebs, said microfiber microwebs having relatively dense microfiber nuclei with individual fibers and/or bundles protruding therefrom.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said divellicating comprises subjecting said microfiber web to the action of a lickerin.
Claim 4
Dependent Claim
21 words
The method of claim 1 further comprising depositing sorbent particulate material into said microfiber web during forming of said microfiber web.
Claim 5
Dependent Claim
15 words
The method of claim 3 further comprising applying to the microfiber web a binder material.
Claim 6
Independent Claim
129 words
A method for producing nonwoven webs comprising melt blow microfibers and microfiber microwebs, comprising the steps of (a) forming a first web of melt blown microfibers; (b) divellicating said first melt blow microfiber web to form microfiber microwebs, said microfiber microwebs having relatively dense microfiber nuclei with individual fibers and/or fiber bundles protruding therefrom; (c) forming a primary stream of melt blown carrier fibers; (d) forming a secondary stream of said microfiber microwebs; (e) merging said primary and secondary streams under turbulent conditions such that said microfiber microwebs are distributed throughout said melt blow carrier fibers of said primary stream; (f) forming a web of said melt blow carrier fibers and said microfiber microwebs; and (g) collecting said web of said melt blow carrier fibers and said microfiber microwebs.
Claim 7
Independent Claim
129 words
A method for producing nonwoven webs comprising melt blow microfibers and microfiber microwebs, comprising the steps of (a) forming a first web of melt blown microfibers; (b) divellicating said first melt blow microfiber web to form microfiber microwebs, said microfiber microwebs having relatively dense microfiber nuclei with individual fibers and/or fiber bundles protruding therefrom; (c) forming a primary stream of melt blown carrier fibers; (d) forming a secondary stream of said microfiber microwebs; (e) merging said primary and secondary streams under turbulent conditions such that said microfiber microwebs are distributed throughout said melt blow carrier fibers of said primary stream; (f) forming a web of said melt blow carrier fibers and said microfiber microwebs; and (g) collecting said web of said melt blow carrier fibers and said microfiber microwebs.
Claim 8
Dependent Claim
24 words
The method of claim 5 further comprising depositing sorbent particulate material into said first web of melt blown microfibers during formation of said web.
Claim 9
Dependent Claim
13 words
The method of claim 5 wherein said secondary stream further comprises staple fibers.
Claim 10
Dependent Claim
13 words
The method of claim 7 wherein said staple fibers are crimped bulking fibers.
Claim 11
Dependent Claim
13 words
The method of claim 8 wherein said staple fibers are liquid-sorbent transport fibers.
Claim 12
Independent Claim
78 words
A method for producing nonwoven webs comprising staple carrier fibers and microfiber microwebs, the method comprising the steps of (a) forming a web of melt blown microfibers; (b) divellicating the web of melt blow microfibers to form microfiber microwebs, said microfiber microwebs having relatively dense microfiber nuclei with individual fibers and/or fiber bundles protruding therefrom; (c) mixing said microfiber microwebs with staple carrier fiber; (d) forming a nonwoven web of said mixture; and (e) collecting said nonwoven web.
Claim 13
Independent Claim
78 words
A method for producing nonwoven webs comprising staple carrier fibers and microfiber microwebs, the method comprising the steps of (a) forming a web of melt blown microfibers; (b) divellicating the web of melt blow microfibers to form microfiber microwebs, said microfiber microwebs having relatively dense microfiber nuclei with individual fibers and/or fiber bundles protruding therefrom; (c) mixing said microfiber microwebs with staple carrier fiber; (d) forming a nonwoven web of said mixture; and (e) collecting said nonwoven web.
Claim 14
Dependent Claim
23 words
The method of claim 10 further comprising depositing sorbent particulate material into said web of melt blow microfibers during formation of said web.
Claim 15
Independent Claim
115 words
A method for producing nonwoven webs comprising wood pulp carrier fibers and microfiber microwebs, the method comprising the steps of (a) forming a web of melt blow microfibers; (b) divellicating the web of melt blown microfibers to form microfiber microwebs, said microfiber microwebs having relatively dense microfiber nuclei with individual fibers and/or fiber bundles protruding therefrom; (c) individualizing wood pulp fibers; (d) providing said microfiber microwebs in a first gas stream; (e) providing said individualized wood pulp fibers in a second gas stream; (f) merging said first and second gas streams to mix said microfiber microwebs with said wood pulp fibers; (g) forming a nonwoven web of said mixture; and (h) collecting said nonwoven web.
Claim 16
Independent Claim
115 words
A method for producing nonwoven webs comprising wood pulp carrier fibers and microfiber microwebs, the method comprising the steps of (a) forming a web of melt blow microfibers; (b) divellicating the web of melt blown microfibers to form microfiber microwebs, said microfiber microwebs having relatively dense microfiber nuclei with individual fibers and/or fiber bundles protruding therefrom; (c) individualizing wood pulp fibers; (d) providing said microfiber microwebs in a first gas stream; (e) providing said individualized wood pulp fibers in a second gas stream; (f) merging said first and second gas streams to mix said microfiber microwebs with said wood pulp fibers; (g) forming a nonwoven web of said mixture; and (h) collecting said nonwoven web.
Claim 17
Dependent Claim
23 words
The method of claim 12 further comprising depositing sorbent particulate material into said web of melt blow microfibers during formation of said web.
References Cited (Backward Citations)
US3016599A
Cited
US3073735A
Cited
US2988782A
Cited
US3316904A
Cited
US4065599A
Cited
US3892909A
Cited
US3971373A
Cited
US4011067A
Cited
US4100324A
Cited
US3901236A
Cited
US4160059A
Cited
US4103062A
Cited
US4118531A
Cited
US4259400A
Cited
US4144294A
Cited
US4239043A
Cited
US4392903A
Cited
US4418103A
Cited
US4469734A
Cited
US4429001A
Cited
US4426417A
Cited
EP0156649A2
Cited
US4604313A
Cited
US4650479A
Cited
US4618531A
Cited
US4588635A
Cited
US4812283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |