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US4208366A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for preparing a nonwoven web

Assignee: Van Dorn Co
•
Filing: 1978-10-31
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Granted: 1980-06-17
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Expires: 1998-10-31
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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

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