Patent US4558459A successfully refreshed from Google Patents.
Patent US4223633A successfully refreshed from Google Patents.
US4223633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating applicator
Assignee: Weyerhaeuser Co
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Filing: 1979-03-01
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Granted: 1980-09-23
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Expires: 1999-03-01
Abstract
Abstract This invention is an improved applicator for coatings. It is particularly useful for applying hot-melt adhesives in the manufacture of corrugated board. The applicator consists of an apertured manifold from which adhesive flows in parallel ribbons onto a transfer roll. This, in turn, prints it on the tips of the flutes at the single facer or double backer. The manifold is center fed and is equipped with motor-driven, axially adjustable pistons to adjust the width of adhesive spread to the width of surface being coated or bonded. An air purge system operating from within the pistons effectively removes any residual material from the orifices when the pistons are advanced toward the center of the manifold. This prevents plugging from adhesives setting up in the unused orifices. The purge system can also be used to clear orifices that become plugged during operation or to completely remove all adhesive from the manifold.
Inventors
- 👤 Eric Alvensleben
- 👤 Jay R. Ryan
- 👤 Wayne C. Gaughran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:20
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2818
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
126 words
A fluid applicator system which is adjustable within limits defined by the edges of a relatively moving receiving surface of variable width which comprises: (a) an apertured manifold tube; (b) a supply of fluid to a central location of the manifold tube; (c) a pair of opposed movable pistons within the manifold tube which act as seals at each end of the tube and define the number and position of apertures open to supply fluid to the receiving surface; (d) drive means for controlling the location of the pistons along the axis of the manifold; (e) the pistons also serving as purge means for expelling residual fluid from the manifold when the applicator is not in operation or to remove accumulated foreign materials having aperture-plugging tendencies.
Claim 2
Dependent Claim
126 words
A fluid applicator system which is adjustable within limits defined by the edges of a relatively moving receiving surface of variable width which comprises: (a) an apertured manifold tube; (b) a supply of fluid to a central location of the manifold tube; (c) a pair of opposed movable pistons within the manifold tube which act as seals at each end of the tube and define the number and position of apertures open to supply fluid to the receiving surface; (d) drive means for controlling the location of the pistons along the axis of the manifold; (e) the pistons also serving as purge means for expelling residual fluid from the manifold when the applicator is not in operation or to remove accumulated foreign materials having aperture-plugging tendencies.
Claim 3
Dependent Claim
105 words
The application system of claim 1 wherein the drive means comprises: (a) motor means; (b) a drive shaft located within the end portion of the manifold tube, coupled to the motor means at its proximal end and terminating in a threaded portion at its distal end; and (c) a threaded shaft which is restrained from rotation and which positions the piston at its distal end, the threaded shaft engaging the threaded portion of the drive shaft in a coaxial telescoping arrangement so as to be axially movable within the manifold upon rotation of the drive shaft in order to control the position of the piston.
Claim 4
Dependent Claim
18 words
The application system of claim 2 wherein the threaded shaft is located axially within a hollow drive shaft.
Claim 5
Dependent Claim
77 words
The application system of claim 3 wherein: (a) the threaded shaft is itself hollow and terminates in a sleeve bearing at its distal end; and (b) the piston is rigidly mounted to a third shaft which is concentrically located within the threaded shaft, the third shaft being free to move back and forth within the sleeve bearing, the piston normally held in abutting relationship with the sleeve bearing by the pressure of the fluid within the manifold.
Claim 6
Dependent Claim
77 words
The application system of claim 4 including a second fluid source supplied to the outboard ends of the manifold and isolated from the first fluid by the piston, the second fluid source adapted to exert force against the proximal end of the third shaft so as to selectively force the piston inwardly toward the center of the manifold when the force exerted by the second fluid is sufficient to overcome the force exerted by the first fluid.
Claim 7
Dependent Claim
30 words
The application system of claim 5 in which the third shaft is also hollow and the force of the second fluid is exerted directly against the back of the piston.
Claim 8
Dependent Claim
41 words
The application system of claim 6 in which the piston is in two sections having an annular space between them, each section of the piston having sealing means operating against the manifold wall to prevent leakage of fluid past the section.
Claim 9
Dependent Claim
63 words
The application system of claim 7 in which the proximal section of the piston is vented to establish fluid communication between the second fluid and the annular space between the sections of the piston, so that as the piston is moved along the manifold tube the residual first fluid is flushed from the orifices by the second fluid flowing from the annular space.
Claim 10
Dependent Claim
46 words
The application system of claim 8 in which the pressure drop across the vent into the annular space between the sections of the piston is relatively high so that the force of the second fluid against the proximal section of the piston is not materially reduced.
Claim 11
Dependent Claim
14 words
The application system of claim 8 in which the second fluid is a liquid.
Claim 12
Dependent Claim
14 words
The application system of claim 8 in which the second fluid is a gas.
Claim 13
Dependent Claim
13 words
The application system of claim 11 in which the second fluid is air.
Claim 14
Dependent Claim
25 words
The application system of claim 1 further in combination with a transfer roll to transfer the first fluid from the manifold to the receiving surface.
Claim 15
Dependent Claim
15 words
The application system of claim 1 in which the receiving surface is a corrugated material.
Claim 16
Dependent Claim
15 words
The application system of claim 13 in which the receiving surface is a corrugated material.
Claim 17
Dependent Claim
14 words
The application system of claim 14 in which the first fluid is an adhesive.
Claim 18
Dependent Claim
14 words
The application system of claim 15 in which the first fluid is an adhesive.
Claim 19
Dependent Claim
15 words
The application system of claim 17 in which the adhesive is a hot melt type.
Claim 20
Dependent Claim
21 words
The application system of claim 18 in which excess adhesive is doctored from the transfer roll and recycled to the manifold.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |