US4288475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for impregnating a fibrous web
Assignee: Owens Corning Fiberglas Technology Inc
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Filing: 1979-10-22
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Granted: 1981-09-08
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Expires: 1999-10-22
Abstract
Abstract A method and apparatus for impregnating a fibrous web is disclosed having a conveyor for advancing the fibrous web. The fibrous web having a first surface and a second surface. An applicator is provided for applying a foamed binder to the first surface of the fibrous web and the foamed binder seals the first surface of the web. A vacuum chamber is positioned adjacent the second surface of the web. The vacuum chamber contains a narrow slot adjacent the second surface of the web for applying a vacuum to the web. The vacuum acts upon the web to reduce the thickness of the web and to draw the foamed binder material into the web to impregnate the web.
Inventors
- 👤 Brian L. Meeker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:49
CPC Classifications
D; D06; D06B; D06B19/00; D06B19/0088; D06B19/0094; B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/502; D06B5/00; D06B5/02; D06B5/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
148 words
A method for impregnating a web of fibrous material comprising the steps of: advancing a web of fibrous material having a first and a second surface along a path; applying a foamed binder material to the first surface of the web, the foamed binder material sealing the first surface of the web; and applying a source of vacuum to the second surface of the web, the vacuum being applied at a first and second location to the second surface of the web, the vacuum from the first and second locations overlapping in effect on the web, the vacuum compressing the web of fibrous material to an extent where the web is no more than one half its original thickness whereby the resistance to flow through the web is substantially uniform, the source of vacuum drawing the foamed binder into the web to impregnate the web with binder material.
Claim 2
Independent Claim
148 words
A method for impregnating a web of fibrous material comprising the steps of: advancing a web of fibrous material having a first and a second surface along a path; applying a foamed binder material to the first surface of the web, the foamed binder material sealing the first surface of the web; and applying a source of vacuum to the second surface of the web, the vacuum being applied at a first and second location to the second surface of the web, the vacuum from the first and second locations overlapping in effect on the web, the vacuum compressing the web of fibrous material to an extent where the web is no more than one half its original thickness whereby the resistance to flow through the web is substantially uniform, the source of vacuum drawing the foamed binder into the web to impregnate the web with binder material.
Claim 3
Dependent Claim
39 words
The method of claim 1 in which the vacuum from the second location maintains the web in contact with the surface of the conveyor and draws additional foamed binder into the web to impregnate the web with foamed binder.
Claim 4
Dependent Claim
24 words
The method of claim 1 in which the foamed binder material is uniformly distributed on the first surface of the web of fibrous material.
Claim 5
Dependent Claim
50 words
The method of claim 1 in which the impregnated web is reversed in orientation, foamed binder material is applied to the second surface of the web and vacuum is applied to the first surface of the web to draw the foamed binder material into the web to impregnate the web.
Claim 6
Dependent Claim
145 words
Apparatus for impregnating a fibrous web comprising: a conveyor for advancing a fibrous web, the fibrous web having a first surface and a second surface; an applicator for applying a foamed binder to the first surface of the fibrous web, the foamed binder sealing the first surface of the web; and a vacuum chamber positioned adjacent the second surface of the web, the vacuum chamber containing at least two narrow slots adjacent the second surface of the web for applying a vacuum to the web, the vacuum from the slots overlapping in effect on the web, the vacuum acting upon the web to compress the web to an extent where the web is no more than one half its original thickness whereby the resistence to flow through the web is substantially uniform and to draw the foamed binder into the web to impregnate the web.
Claim 7
Dependent Claim
145 words
Apparatus for impregnating a fibrous web comprising: a conveyor for advancing a fibrous web, the fibrous web having a first surface and a second surface; an applicator for applying a foamed binder to the first surface of the fibrous web, the foamed binder sealing the first surface of the web; and a vacuum chamber positioned adjacent the second surface of the web, the vacuum chamber containing at least two narrow slots adjacent the second surface of the web for applying a vacuum to the web, the vacuum from the slots overlapping in effect on the web, the vacuum acting upon the web to compress the web to an extent where the web is no more than one half its original thickness whereby the resistence to flow through the web is substantially uniform and to draw the foamed binder into the web to impregnate the web.
Claim 8
Dependent Claim
38 words
The apparatus of claim 5 wherein a header having a plurality of orifices is used to apply the foamed resinous material to the fibrous web, the header being positioned perpendicular to the direction of advancement of the web.
Claim 9
Dependent Claim
44 words
The apparatus of claim 6 wherein discharge nozzles are positioned adjacent the longitudinal edges of the conveyor for applying foamed binder material to the fibrous web, the discharge nozzles discharging binder material in a direction parallel to the direction of advancement of the web.
Claim 10
Dependent Claim
27 words
The apparatus of claim 5 wherein the applicator contains a spreader for distributing a uniform layer of foamed binder on the first surface of the fibrous web.
Claim 11
Dependent Claim
38 words
The apparatus of claim 5 wherein the vacuum chamber has a plurality of independent chambers, each chamber being connected to an individual source of vacuum, each chamber containing a narrow slot adjacent the second surface of the web.
Claim 12
Dependent Claim
194 words
Apparatus for impregnating a fibrous web comprising: a conveyor for advancing a fibrous web, the fibrous web having a first surface and a second surface; an applicator for applying a foamed binder to the first surface of the fibrous web, the applicator containing a header having a plurality of orifices positioned adjacent the first surface of the web and discharge nozzles positioned adjacent the longitudinal edges of the web, the foamed binder sealing the surface of the web; and a vacuum chamber positioned adjacent the second surface of the web, the vacuum chamber having a plurality of independent chambers, each chamber being connected to an individual source of vacuum, each chamber contains a narrow slot adjacent the second surface of the web for applying a vacuum to the web, the slots being positioned so that the vacuum effect of each slot on the fibrous web overlaps, the vacuum acting upon the web to compress the web to an extent where the web is at least one half its original thickness whereby the resistence to flow through the web is substantially uniform and to draw the foamed binder into the web to impregnate the web.
Claim 13
Dependent Claim
194 words
Apparatus for impregnating a fibrous web comprising: a conveyor for advancing a fibrous web, the fibrous web having a first surface and a second surface; an applicator for applying a foamed binder to the first surface of the fibrous web, the applicator containing a header having a plurality of orifices positioned adjacent the first surface of the web and discharge nozzles positioned adjacent the longitudinal edges of the web, the foamed binder sealing the surface of the web; and a vacuum chamber positioned adjacent the second surface of the web, the vacuum chamber having a plurality of independent chambers, each chamber being connected to an individual source of vacuum, each chamber contains a narrow slot adjacent the second surface of the web for applying a vacuum to the web, the slots being positioned so that the vacuum effect of each slot on the fibrous web overlaps, the vacuum acting upon the web to compress the web to an extent where the web is at least one half its original thickness whereby the resistence to flow through the web is substantially uniform and to draw the foamed binder into the web to impregnate the web.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |