US5227172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charged collector apparatus for the production of meltblown electrets
Assignee: ExxonMobil Chemical Patents Inc
•
Filing: 1991-05-14
•
Granted: 1993-07-13
•
Expires: 2011-05-14
Abstract
Abstract The apparatus of the present invention employs a collector drum with an electrically charged surface for use in preparing electrically charged meltblown fibrous webs. The apparatus may be used as a primary charging system or, alternatively, with other charging system to enhance the charging of the web. The invention produces webs with exceptional filtration properties.
Inventors
- 👤 William E. Deeds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:55
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/24; B29C41/26; B29C48/00; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29C48/25; B29C48/30; B29C48/345; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/9165; B29C41/02; B29C41/08; B29K; B29K2995/00; B29K2995/0003; B29L; B29L2007/00; B29L2007/008
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A meltblowing apparatus for electrically charging webs produced thereby which comprises (a) a meltblowing die for discharging a row of thermoplastic molten fibers therefrom and having air chambers formed therein; (b) means for discharging air from the air chambers onto each side of the row of fibers to contact the fibers and form an air-fiber stream; (c) a first charging means including at least one electrode mounted in an air chamber for applying a charge to the air in that air chamber prior to contacting the fibers; (d) a rotating collector drum for collecting the fibers; and (e) a second charging means mounted on the drum for charging the fibers.
Claim 2
Dependent Claim
110 words
A meltblowing apparatus for electrically charging webs produced thereby which comprises (a) a meltblowing die for discharging a row of thermoplastic molten fibers therefrom and having air chambers formed therein; (b) means for discharging air from the air chambers onto each side of the row of fibers to contact the fibers and form an air-fiber stream; (c) a first charging means including at least one electrode mounted in an air chamber for applying a charge to the air in that air chamber prior to contacting the fibers; (d) a rotating collector drum for collecting the fibers; and (e) a second charging means mounted on the drum for charging the fibers.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 wherein the first charging means comprises two high voltage electrodes, one positioned in each air chamber for charging and ionizing the air prior to contacting the fibers.
Claim 4
Dependent Claim
28 words
The apparatus of claim 2 wherein the high voltage electrodes have positive polarity, and the second charging means has a voltage ranging from -25 kV to +25 kV.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 wherein each charging means carries a charge of -25 kV to +25 kV.
Claim 6
Dependent Claim
29 words
The apparatus of claim 1 wherein the collector drum includes an electrically conductive surface and wherein the second charging means comprises a D.C. source electrically connected to the surface.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 wherein the first and second charging means are of opposite polarity.
References Cited (Backward Citations)
US2116942A
Cited
US3593074A
Cited
US4009508A
Cited
US4215682A
Cited
US4594203A
Cited
US4650411A
Cited
US5051159A
Cited
US4904174A
Cited
US5122048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |