Method and apparatus for impregnating a fibrous web
OwnerBrian L. Meekerinventor
Life of this patent
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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.
Claims10
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.
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.
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.
Dependencies are inferred from the claim text.