US4348251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for applying binding agents to fibrous webs
Assignee: Georgia Pacific Consumer Products LP
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Filing: 1980-12-19
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Granted: 1982-09-07
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Expires: 2000-12-19
Abstract
Abstract A method and system for applying a foamed binding agent to a fibrous web is disclosed. The invention is characterized by the use of an extruder having an upper lip extending 1/16 to 1/4 inch beyond the lower lip, and by the drawing of a vacuum beneath the applied foam, said characteristics being critical to the formation of a uniform foam layer atop the web. A second, more substantial vacuum is then applied beneath the web to essentially completely draw the binding agent into the web thereby providing substantial inter-fiber bonding.
Inventors
- 👤 Walter L. Pauls
- 👤 Raymond A. Dunleavy, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:19
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/26; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; B29C44/50; B29C44/505; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/255; B29C48/2556; B29C48/30; B29C48/305; B29C48/31; B29C48/313; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/68; D21; D21H; D21H21/00; D21H21/50; D21H21/56; D21H25/00; D21H25/02; D21H5/00; D21H5/26; D21H5/265; D21H5/2657; D21H5/2664; B29L; B29L2007/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
An apparatus for applying binding agent as a foam to a fibrous web supported by a moving foraminous carrier wire, comprising: a foam extruder having means defining a flow passage terminating in an elongate orifice extending transversely of the direction of movement of said wire, said flow passage being inclined between about 2° and about 25° to the plane of said web in a direction opposite to the direction of wire movement, said elongate orifice including a pair of longer edges positioned at substantially the same distance of from about 1/4 and about 3 inches above said web, and spaced one from the other, in the direction of wire movement, a distance of from about 1/16 inch to about 1/4 inch, and a first vacuum means disposed beneath said wire, and, as respects the direction of wire movement, at a point just downstream of said elongate orifice, said first vacuum means being operative to draw a vacuum of from about 0.1 inch to about 1.0 inch of water.
Claim 2
Independent Claim
168 words
An apparatus for applying binding agent as a foam to a fibrous web supported by a moving foraminous carrier wire, comprising: a foam extruder having means defining a flow passage terminating in an elongate orifice extending transversely of the direction of movement of said wire, said flow passage being inclined between about 2° and about 25° to the plane of said web in a direction opposite to the direction of wire movement, said elongate orifice including a pair of longer edges positioned at substantially the same distance of from about 1/4 and about 3 inches above said web, and spaced one from the other, in the direction of wire movement, a distance of from about 1/16 inch to about 1/4 inch, and a first vacuum means disposed beneath said wire, and, as respects the direction of wire movement, at a point just downstream of said elongate orifice, said first vacuum means being operative to draw a vacuum of from about 0.1 inch to about 1.0 inch of water.
Claim 3
Dependent Claim
45 words
Apparatus of claim 1, wherein there is further included a second vacuum means disposed beneath said wire, and downstream of said first vacuum means, said second vacuum means being operative to draw a vacuum of from about 2 inches to about 15 inches of mercury.
Claim 4
Dependent Claim
42 words
Apparatus of claim 2, wherein said first vacuum means draws a vacuum of from about 0.1 inch to about 0.5 inch of water, and said second vacuum means draws a vacuum of from about 5.0 inches to about 10.0 inches of mercury.
Claim 5
Dependent Claim
17 words
Apparatus of claim 3, wherein said longer edges are spaced one from the other about 3/32 inch.
Claim 6
Dependent Claim
32 words
Apparatus of claim 1, 2, 3, or 4, wherein said foam extruder is operative to discharge foam onto said web at a velocity corresponding substantially to the velocity of said carrier wire.
References Cited (Backward Citations)
US3042573A
Cited
US3348989A
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US3331728A
Cited
US3600750A
Cited
US3609810A
Cited
US4159355A
Cited
US4292271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |