US5254297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging method for meltblown webs
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1992-07-15
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Granted: 1993-10-19
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Expires: 2012-07-15
Abstract
Abstract Electrically charged meltblown webs are formed by convergingly discharging electrically charged hot air onto a row of extruded polymer fibers to contact the fibers thereby (i) attenuating and stretching the fibers and (ii) imparting an electric charge to the fibers. The fibers may be continuous or discontinuous.
Inventors
- 👤 William E. Deeds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:40
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01D5/098; D01D5/0985; B; B01; B01D; B01D39/00; B01D39/02; B01D39/04; B01D39/08; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B29; B29C; B29C71/00; B29C71/0081; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; D06; D06M; D06M10/00; D06M10/02; D06M10/025; B01D2239/00; B01D2239/04; B01D2239/0435; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/064; B29K; B29K2105/00; B29K2105/25; D06M2101/00; D06M2101/16; D06M2101/18; D06M2101/20; D06M2101/22; D06M2101/24; D06M2101/26; D06M2101/30; D06M2101/32; D06M2101/34; D06M2200/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
In a meltblowing process wherein a molten thermo-plastic resin is extruded through a plurality of orifices of a meltblowing die to form a plurality of fibers, and wherein hot air streams are blown into contact with the extruded fibers at such an angle to stretch and attenuate the fibers, the improvement comprising: (a) electrically charging the hot air streams prior to contacting the extruded fibers; and (b) thereafter causing the hot air streams to contact the extruded fibers and impart an electrical charge to the fibers.
Claim 2
Dependent Claim
86 words
In a meltblowing process wherein a molten thermo-plastic resin is extruded through a plurality of orifices of a meltblowing die to form a plurality of fibers, and wherein hot air streams are blown into contact with the extruded fibers at such an angle to stretch and attenuate the fibers, the improvement comprising: (a) electrically charging the hot air streams prior to contacting the extruded fibers; and (b) thereafter causing the hot air streams to contact the extruded fibers and impart an electrical charge to the fibers.
Claim 3
Dependent Claim
38 words
The method of claim 1 wherein the hot air stream is passed internally through the meltblowing die and wherein the electrical charging is achieved by passing the air streams through an electric field established internally of the die.
Claim 4
Dependent Claim
31 words
The process of claim 2 wherein the hot air is charged by passing each stream through an electric field strong enough to ionize the air but below that which produces arcs.
Claim 5
Dependent Claim
42 words
The process of claim 3 wherein the electric field is established by an electrode positioned in each stream and spaced from the die, said electrodes being insulated from the die and connected to a high voltage source, and said die being grounded.
Claim 6
Dependent Claim
37 words
The process of claim 3 wherein the electric field is established by a voltage high enough to produce corona discharge in the vicinity of the electrode, applied to each electrode and each electrode having a positive polarity.
Claim 7
Dependent Claim
25 words
The process of claim 4 wherein the voltage source is positive and is sufficient to produce a charging current of between 1mA and 10 mA.
References Cited (Backward Citations)
US4215682A
Cited
US4486365A
Cited
US4592815A
Cited
JPS62250212A
Cited
JPS62250211A
Cited
JPS62250210A
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) | 1996-10-18 | 1997-04-19 | 1997-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-18 | 2001-04-19 | 2001-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-18 | 2005-04-19 | 2005-10-19 | $7700.00 | Window Closed / Lapsed |