US4208366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a nonwoven web
Assignee: Van Dorn Co
•
Filing: 1978-10-31
•
Granted: 1980-06-17
•
Expires: 1998-10-31
Abstract
Abstract A process and apparatus for forming a non-woven web in which a bundle of untwisted filaments are charged upstream of a pair of elastomer-covered counter rotating squeeze rolls and propelled through the nip of the rolls to a moving laydown belt with the assistance of an electrostatic field developed between the rolls and the belt.
Inventors
- 👤 George A. Kinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:24
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; D04H3/02; D04H3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
In a process for preparing a uniform nonwoven web that includes the steps of forwarding a continuous bundle of untwisted filaments through an electrostatic charging zone to deposit a charge on the filaments and collecting the filaments as a web on a moving collecting surface, the improvement comprising: passing the charged filaments into the nip between two contiguous elastomer covered electrically grounded counter rotating rolls located between the charging zone and the collecting surface; generating an electrostatic field between said rolls and said collecting surface, said electrostatic field having a polarity oriented to repel the charged filaments from the surface of said rolls facing said collecting surface and to move the charged filaments toward the collecting surface; and propelling the charged filaments into said electrostatic field by means of said rolls.
Claim 2
Dependent Claim
131 words
In a process for preparing a uniform nonwoven web that includes the steps of forwarding a continuous bundle of untwisted filaments through an electrostatic charging zone to deposit a charge on the filaments and collecting the filaments as a web on a moving collecting surface, the improvement comprising: passing the charged filaments into the nip between two contiguous elastomer covered electrically grounded counter rotating rolls located between the charging zone and the collecting surface; generating an electrostatic field between said rolls and said collecting surface, said electrostatic field having a polarity oriented to repel the charged filaments from the surface of said rolls facing said collecting surface and to move the charged filaments toward the collecting surface; and propelling the charged filaments into said electrostatic field by means of said rolls.
References Cited (Backward Citations)
US2070307A
Cited
US2558900A
Cited
US2917787A
Cited
US3172024A
Cited
US3163753A
Cited
US3436797A
Cited
US3506744A
Cited
US3490115A
Cited
US3708561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |