US3965860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plywood manufacture using foamed glues
Assignee: Pacific Adhesives Co Inc
•
Filing: 1973-03-23
•
Granted: 1976-06-29
•
Expires: 1993-03-23
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 into a plywood panel. The veneers may be preheated to expedite setting of the glue. The method is applicable generally to 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
2026-10-31 23:18
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/06; B05D7/08; B27; B27D; B27D1/00; B27D1/04; B27G; B27G11/00; B05D3/00; B05D3/02; B05D3/0218; B05D5/00; B05D5/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
Apparatus for applying foamed liquids to surface, which comprises: a. positive displacement liquid pump means for continously propelling the liquid in unfoamed condition at a predetermined flow rate, b. liquid foaming means communicating with the pump means for receiving the propelled liquid and foaming it as it is propelled, the foaming means comprising: 1. a generally cylindrical rotor and stator, with the rotor being rotatably mounted within the stator and spaced therefrom, 2. at one end of the stator first and second conduit means arranged for the respective introduction between the rotor and stator in the direction of the axis of rotation of the rotor of (a) unfoamed liquid from the pump means and (b) a foaming gas under pressure,
Claim 2
Dependent Claim
120 words
Apparatus for applying foamed liquids to surface, which comprises: a. positive displacement liquid pump means for continously propelling the liquid in unfoamed condition at a predetermined flow rate, b. liquid foaming means communicating with the pump means for receiving the propelled liquid and foaming it as it is propelled, the foaming means comprising: 1. a generally cylindrical rotor and stator, with the rotor being rotatably mounted within the stator and spaced therefrom, 2. at one end of the stator first and second conduit means arranged for the respective introduction between the rotor and stator in the direction of the axis of rotation of the rotor of (a) unfoamed liquid from the pump means and (b) a foaming gas under pressure,
Claim 3
Dependent Claim
120 words
a plurality of radially extending spaced recesses in the opposed cylindrical surfaces of the rotor and stator, the recesses in the rotor being arranged to sweep across the recesses in the stator upon rotation of the rotor, thereby agitating the liquid and gas and foaming the liquid, and 4. third conduit means at the end of the stator opposite said one end for conveying away the resultant foamed liquid, and c. applicator means communicating with the third conduit means for receiving the foamed liquid and applying it continuously to the surface, d. the pump means maintaining the flow rates of the unfoamed and foamed liquids at substantially the same values on a unit weight of liquid per unit time basis.
Claim 4
Dependent Claim
120 words
a plurality of radially extending spaced recesses in the opposed cylindrical surfaces of the rotor and stator, the recesses in the rotor being arranged to sweep across the recesses in the stator upon rotation of the rotor, thereby agitating the liquid and gas and foaming the liquid, and 4. third conduit means at the end of the stator opposite said one end for conveying away the resultant foamed liquid, and c. applicator means communicating with the third conduit means for receiving the foamed liquid and applying it continuously to the surface, d. the pump means maintaining the flow rates of the unfoamed and foamed liquids at substantially the same values on a unit weight of liquid per unit time basis.
Claim 5
Dependent Claim
97 words
The apparatus of claim 1 for applying foamed plywood glue to wood veneers, the apparatus including a reservoir for containing the glue in liquid, unfoamed condition, the reservoir being connected to the pump means, the liquid foaming means communicating with the pump means and with a source of foam producing gas under pressure, the applicator means comprises extruding means connected to the foaming means for receiving and extruding the foamed glue, and veneer conveyor means arragned relative to the extruding means for conveying wood veneers adjacent the same for depositing the extruded glue on the veneer surfaces.
Claim 6
Dependent Claim
94 words
In foamed liquid applying apparatus, an extruder comprising: a. a laterally elongated first chamber, b. means for connecting the first chamber to a source of foamed liquid under pressure, c. a laterally elongated second chamber, having a plurality of extrusion openings along its length, d. conduit means interconnecting the first and second chambers substantially throughout their lengths, and e. valve means disposed in the conduit means for varying the flow of liquid selectively into different lateral portions of the second chamber as required to produce a predetermined flow of liquid through the extrusion openings.
Claim 7
Dependent Claim
94 words
In foamed liquid applying apparatus, an extruder comprising: a. a laterally elongated first chamber, b. means for connecting the first chamber to a source of foamed liquid under pressure, c. a laterally elongated second chamber, having a plurality of extrusion openings along its length, d. conduit means interconnecting the first and second chambers substantially throughout their lengths, and e. valve means disposed in the conduit means for varying the flow of liquid selectively into different lateral portions of the second chamber as required to produce a predetermined flow of liquid through the extrusion openings.
Claim 8
Dependent Claim
36 words
The apparatus of claim 3 wherein the conduit means is elongated laterally, and wherein the valve means comprises adjusting means arranged for adjusting the width of the conduit means in selected locations along its lateral length.
Claim 9
Dependent Claim
67 words
The apparatus of claim 3 wherein the conduit means is elongated and wherein the valve means comprises a pair of flexible plates spaced from each other and providing an elongated slot therebetween, and pressure applying means for applying pressure to selected areas of the plates in a direction calculated to flex them relative to each other, thereby altering the width of the corresponding portions of the slot.
Claim 10
Dependent Claim
17 words
The apparatus of claim 5 wherein the pressure applying means comprises screw means bearing against the plates.
Claim 11
Dependent Claim
31 words
The apparatus of claim 3 wherein the conduit means is elongated laterally and wherein the valve means includes adjustable sealing means for adjustably sealing off the ends of the conduit means.
Claim 12
Dependent Claim
69 words
The apparatus of claim 3 wherein the conduit means is elongated laterally and wherein the valve means includes a pair of gate valve members, mounting means slidably mounting the gate valve members one at each end of the conduit means in sealing relation thereto, and adjustment means connected to the gate valve members for adjusting their positions as required to seal off predetermined terminal portions of the conduit means.
Claim 13
Dependent Claim
12 words
The apparatus of claim 8 wherein the adjustment means comprises screw means.
Claim 14
Dependent Claim
37 words
The apparatus of claim 3 wherein the conduit means comprises a plurality of laterally spaced tubes and wherein the valve means comprises a corresponding plurality of valves one in each tube, for controlling the liquid flow therethrough.
Claim 15
Dependent Claim
30 words
The apparatus of claim 3 wherein the conduit means comprises a plurality of laterally spaced tubes and wherein the valve means comprises gate valve means mounted one in each tube.
References Cited (Backward Citations)
US2731253A
Cited
US2749005A
Cited
US2791353A
Cited
US2982995A
Cited
US3224411A
Cited
US3112527A
Cited
US3239100A
Cited
US3408981A
Cited
US3377655A
Cited
US3428985A
Cited
US3452710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |