Patent US4258088A successfully refreshed from Google Patents.
US4258088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the uniform application of foamed liquid mixtures to substrates
Assignee: Individual
•
Filing: 1977-05-02
•
Granted: 1981-03-24
•
Expires: 1997-05-02
Abstract
Abstract Foamed liquid mixtures are applied to substrates, in particular foamed plywood glues, are spread on traveling wood veneers in the manufacture of plywood by a method comprising the following steps: The liquid is withdrawn from a source of the same, is subjected to a mechanical beating action wherein its density is reduced and is then passed to a reservoir or feed storage vessel. Density-reduced liquid is then foamed and the foam is continuously extruded or otherwise spread on an intermittently-moving substrate during the periods of motion of the substrate. The foamed liquid is continuously diverted from the substrate during the periods of rest of the substrate. The diverted foamed liquid then is defoamed by subjecting it to the same mechanical beating action applied to the liquid thereby increasing its density to substantially that of the density-reduced liquid. Thus, there is obtained a uniform density feed to the foamer making possible a uniform application of foamed liquid on the substrate even though the motion of the substrate is started and stopped at frequent intervals.
Inventors
- 👤 Charles N. Cone
- 👤 Julius M. Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:05
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/06; B05D7/08; B27; B27G; B27G11/00; B05D3/00; B05D3/02; B05D3/0218; B05D5/00; B05D5/10; Y; Y10; Y10S; Y10S366/00; Y10S366/604
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
187 words
A method for the uniform application of a foamed viscous liquid to an intermittently-moving substrate which comprises: (a) subjecting the raw liquid to a mechanical beating action whereby its density is reduced; (b) passing said liquid of reduced density to a feed reservoir; (c) withdrawing liquid from said feed reservoir and passing said liquid to a foamer; (d) foaming said liquid and passing it to a diversion point while maintaining a constant and predetermined pressure drop between the foamer and diversion point; (e) passing the foamed liquid from the diversion point to a foam spreader and continuously depositing the foamed liquid as a foam on said intermittently-moving substrate during its period of motion while substantially maintaining said constant and predetermined pressure drop; (f) diverting the foamed liquid from the diversion point during those periods wherein said intermittently moving substrate is at rest; (g) subjecting said diverted foamed liquid to a mechanical beating action operable to increase its density to substantially that of said liquid of reduced density while substantially maintaining said constant and predetermined pressure drop, and (h) passing the mechanically beaten liquid to said feed reservoir.
Claim 2
Independent Claim
187 words
A method for the uniform application of a foamed viscous liquid to an intermittently-moving substrate which comprises: (a) subjecting the raw liquid to a mechanical beating action whereby its density is reduced; (b) passing said liquid of reduced density to a feed reservoir; (c) withdrawing liquid from said feed reservoir and passing said liquid to a foamer; (d) foaming said liquid and passing it to a diversion point while maintaining a constant and predetermined pressure drop between the foamer and diversion point; (e) passing the foamed liquid from the diversion point to a foam spreader and continuously depositing the foamed liquid as a foam on said intermittently-moving substrate during its period of motion while substantially maintaining said constant and predetermined pressure drop; (f) diverting the foamed liquid from the diversion point during those periods wherein said intermittently moving substrate is at rest; (g) subjecting said diverted foamed liquid to a mechanical beating action operable to increase its density to substantially that of said liquid of reduced density while substantially maintaining said constant and predetermined pressure drop, and (h) passing the mechanically beaten liquid to said feed reservoir.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the substrate comprises plywood veneer and the foamable liquid comprises a foamable plywood glue.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein the glue is withdrawn continuously from said reservoir and wherein the withdrawn glue is continuously foamed.
Claim 5
Dependent Claim
16 words
The method of claim 2 wherein the foamable plywood glue comprises a foamable phenolic resin glue.
Claim 6
Dependent Claim
46 words
The method of claim 3 wherein the glue comprises a foamable aqueous alkaline phenolformaldehyde resin having an original density in the raw state of more than about 1.0 g/cc and wherein its density is reduced to about 0.9 to 0.95 g/cc by said mechanical beating action.
Claim 7
Dependent Claim
46 words
The method of claim 5 wherein the glue of reduced density is foamed to a density in the range of 0.1 to 0.5 g/cc and wherein diverted foamed glue is subjected to a mechanical beating action which increases its density to about 0.9 to 0.95 g/cc.
Claim 8
Dependent Claim
24 words
The method of claim 6 wherein the glue of reduced density is foamed to a density in the range of 0.15 to 0.3 g/cc.
Claim 9
Dependent Claim
25 words
The method of claim 3 wherein said glue is withdrawn from the feed reservoir and passed to the foamer at a substantially constant volume rate.
Claim 10
Dependent Claim
19 words
The method of claim 3 wherein the foamed glue is applied to said plywood veneer by extruding it thereon.
Claim 11
Independent Claim
180 words
The method for the uniform spreading of a foamed, viscous liquid glue on an intermittently moving substrate which comprises: (a) providing a communicating conduit system including: a reservoir; downstream from the reservoir a foamer; downstream from the foamer a diversion point; and downstream from the diversion point in separate conduits a foam spreader and a defoamer, (b) pumping unfoamed liquid glue from the reservoir to the foamer, thereby establishing in the conduit system a glue-driving pressure differential, (c) maintaining the pressure differential between the foamer and the diversion point at a substantially constant and predetermined value, (d) converting the liquid glue in the foamer to the condition of a stable foam of predetermined density, (e) delivering the foam to the spreader during the periods of motion of the substrate, (f) spreading the foam delivered to the spreader on the substrate to form a foamed glue coating thereon, (g) diverting the foam to the defoamer during the periods of rest of the substrate, (h) defoaming the foam delivered to the defoamer, and (i) cycling the defoamed glue back to the reservoir.
Claim 12
Independent Claim
180 words
The method for the uniform spreading of a foamed, viscous liquid glue on an intermittently moving substrate which comprises: (a) providing a communicating conduit system including: a reservoir; downstream from the reservoir a foamer; downstream from the foamer a diversion point; and downstream from the diversion point in separate conduits a foam spreader and a defoamer, (b) pumping unfoamed liquid glue from the reservoir to the foamer, thereby establishing in the conduit system a glue-driving pressure differential, (c) maintaining the pressure differential between the foamer and the diversion point at a substantially constant and predetermined value, (d) converting the liquid glue in the foamer to the condition of a stable foam of predetermined density, (e) delivering the foam to the spreader during the periods of motion of the substrate, (f) spreading the foam delivered to the spreader on the substrate to form a foamed glue coating thereon, (g) diverting the foam to the defoamer during the periods of rest of the substrate, (h) defoaming the foam delivered to the defoamer, and (i) cycling the defoamed glue back to the reservoir.
Claim 13
Dependent Claim
31 words
The method of claim 10 including the step of adjusting the densities of the unfoamed liquid glue in the reservoir and the defoamed foam cycled back thereto to a common density.
References Cited (Backward Citations)
US3081184A
Cited
US3218193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |