US3895984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plywood manufacture using foamed glues
Assignee: Pacific Adhesives Co Inc
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Filing: 1973-10-12
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Granted: 1975-07-22
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Expires: 1993-10-12
Abstract
Abstract Plywood is made by continuously propelling a liquid plywood glue in unfoamed condition at a predetermined flow rate, continuously foaming the glue as it is propelled, and continuously extruding or otherwise applying the foamed glue to the surface of a plurality of wood veneers. The flow rate of the unfoamed and foamed glue is maintained substantially the same on a unit weight of liquid glue per unit time basis. The veneers then are laid up into a plywood assembly and pressed, whereupon the pressure breaks the foam and unites the veneers. The method is applicable generally to the production of laminar products by the application of a foamed liquid to a solid surface.
Inventors
- 👤 Charles N Cone
- 👤 Julius M Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:51
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/13; B05; B05D; B05D7/00; B05D7/06; B05D7/08; B27; B27D; B27D1/00; B27D1/04; B27G; B27G11/00; B32B37/00; B32B37/10; B32B7/00; B32B7/04; B32B7/12; B05D3/00; B05D3/02; B05D3/0218; B05D5/00; B05D5/10; B32B2607/00; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1744; Y10T156/1798
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
123 words
The method of making a laminar product which comprises, a. continuously propelling in unfoamed condition and at a predetermined flow rate, a liquid comprising a liquid glue or liquid glue component, b. continuously foaming the liquid as it is propelled, c. continuously extruding the foamed liquid on the surface of a first sheet at a predetermined flow rate of foamed liquid and predetermined rate of traversal of extruded foamed liquid and surface relative to each other, d. applying a second sheet to the foamed liquid on said surface, e. at least one of said sheets being a porous cellulosic sheet, and f. pressing the resulting assembly under conditions predetermined to break the foam and create a substantially unfoamed glue bond uniting the sheets.
Claim 2
Independent Claim
123 words
The method of making a laminar product which comprises, a. continuously propelling in unfoamed condition and at a predetermined flow rate, a liquid comprising a liquid glue or liquid glue component, b. continuously foaming the liquid as it is propelled, c. continuously extruding the foamed liquid on the surface of a first sheet at a predetermined flow rate of foamed liquid and predetermined rate of traversal of extruded foamed liquid and surface relative to each other, d. applying a second sheet to the foamed liquid on said surface, e. at least one of said sheets being a porous cellulosic sheet, and f. pressing the resulting assembly under conditions predetermined to break the foam and create a substantially unfoamed glue bond uniting the sheets.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein the flow rates of the unfoamed and foamed liquid are maintained substantially the same, on a unit weight of liquid per unit time basis.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the foamed liquid is extruded and deposited on the surface in laterally spaced filaments.
Claim 5
Dependent Claim
68 words
The method of claim 2 wherein the foamed liquid is extruded and deposited on the surface in laterally spaced filaments the filaments being stretchable and extruded by passing the filaments and the surface relative to each other at a relative rate such that the filaments are stretched as they are deposited in frictional engagement with the surface to an extent determining the magnitude of application of the liquid.
Claim 6
Dependent Claim
26 words
The method of claim 2 wherein the foamed liquid is applied to the surface by extruding it thereon in the condition of a substantillay continuous film.
Claim 7
Dependent Claim
33 words
The method of claim 2 wherein the liquid is foamed by feeding a foam-promoting gas into the liquid as it is propelled, and then mechanically agitating the resultant mixture of gas and liquid.
Claim 8
Dependent Claim
54 words
The method of claim 2 wherein the liquid is foamed by feeding a foam-promoting gas into the liquid as it is propelled and then mechanically agitating the resultant mixture of gas and liquid, by passing the mixture between a recessed rotor and stator in the direction of the axis of rotation of the rotor.
Claim 9
Dependent Claim
61 words
The method of claim 2 including the step of adding to the unfoamed liquid a material chemically reactive toward the liquid and thereafter immediately foaming the liquid and applying the foamed liquid to the surface in the time interval elapsing between the time of addition of the reactive material and the time required for substantial reaction with the liquid to occur.
Claim 10
Independent Claim
77 words
THE METHOD OF MAKING PLYWOOD WHICH COMPRISES: A. CONTINUOUSLY PROPELLING AN UNFOAMED LIQUID PLYWOOD GLUE AT A PREDETERMINED FLOW RATE, B. CONTINUOUSLY FOAMING THE LIQUID GLUE AS IT IS PROPELLED, C. CONTINUOUSLY APPLYING THE FOAMED GLUE TO THE SURFACES OF A SUCCESSION OF WOOD VENEERS, D. LAYING UP THE VENEERS INTO A PLYWOOD ASSEMBLY, E. AND PRESSING THE ASSEMBLY TO FORM A PLYWOOD PANEL, THEREBY BREAKING THE FOAM AND FORMING SUBSTANTIALLY UNFOAMED GLUE BONDS BETWEEN THE VENEERS.
Claim 11
Independent Claim
77 words
THE METHOD OF MAKING PLYWOOD WHICH COMPRISES: A. CONTINUOUSLY PROPELLING AN UNFOAMED LIQUID PLYWOOD GLUE AT A PREDETERMINED FLOW RATE, B. CONTINUOUSLY FOAMING THE LIQUID GLUE AS IT IS PROPELLED, C. CONTINUOUSLY APPLYING THE FOAMED GLUE TO THE SURFACES OF A SUCCESSION OF WOOD VENEERS, D. LAYING UP THE VENEERS INTO A PLYWOOD ASSEMBLY, E. AND PRESSING THE ASSEMBLY TO FORM A PLYWOOD PANEL, THEREBY BREAKING THE FOAM AND FORMING SUBSTANTIALLY UNFOAMED GLUE BONDS BETWEEN THE VENEERS.
Claim 12
Dependent Claim
26 words
The method of claim 9 wherein the foamed glue is applied to the veneer surfaces by extruding it thereon in the form of laterally spaced filaments.
Claim 13
Dependent Claim
18 words
The method of claim 9 including the step of preheating the veneers preliminary to applying the foamed glue.
Claim 14
Dependent Claim
64 words
The method of claim 9 wherein the plywood glue comprises a thermosetting resin glue and including the step of preheating the veneers preliminary to application of the glue on the surfaces thereof, the amount of preheating being predetermined to provide the heat required to set the glue during the pressing of the assembly substantially without the addition of supplemental heat from another heat source.
Claim 15
Dependent Claim
49 words
The method of claim 9 wherein the foamed glue is applied in the form of laterally spaced filaments, alternate filaments comprising first and second chemically reactive substances which are caused to mix and react with each other by the application of pressure occuring during the pressing of the assembly.
Claim 16
Dependent Claim
21 words
The method of claim 13 wherein the first and second chemically reactive substances comprise respectively a plywood blood glue and formaldehyde.
Claim 17
Dependent Claim
31 words
The method of claim 13 wherein the first and second chemically reactive substances comprise respectively a thermosetting resinous condensation product of a phenol and an aldehyde, and a setting catalyst therefor.
Claim 18
Dependent Claim
21 words
The method of claim 13 wherein the first and second chemically reactive substances comprise respectively a thermosetting resorcinol resin and paraformaldehyde.
Claim 19
Dependent Claim
36 words
The method of claim 13 wherein the first and second chemically reactive substances comprise respectively a thermosetting resinous condensation product of a phenol and an aldehyde and a thermosetting resinous condensation product of acetone and formaldehyde.
Claim 20
Dependent Claim
38 words
The method of claim 9 wherein the foamed glue is extruded onto the veneer surfaces at substantially the same flow rate as the propelled unfoamed liquid glue, on a unit weight of liquid per unit of time basis.
References Cited (Backward Citations)
US2557826A
Cited
US2872965A
Cited
US3037900A
Cited
US3008862A
Cited
US3174887A
Cited
US3116349A
Cited
US3380866A
Cited
US3385744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |