US3975814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Restoration of suction press shells
Assignee: Individual
•
Filing: 1975-05-27
•
Granted: 1976-08-24
•
Expires: 1995-05-27
Abstract
Abstract A process for restoring a suction press shell used in the removal of water in the formation of paper sheets, the shell consisting of a metal cylinder bonded with a rubber cover and perforated by multiple drainage holes which extend from the inner surface to the outer surface of the shell, the inner surface of the metal cylinder being worn and having lost its uniform aspect, the process comprises the steps of: cleaning and roughening the outer metal surface of the cylinder, winding under tension on the outer surface of the cylinder successive layers of a woven glass or synthetic fiber tape from 2 to 6 inches wide, and impregnating with a concentration of 35 to 55% of thermosetting resin until the required thickness of the tape for stiffening the cylinder within acceptable deflection limits is reached, each layer of tape overlapping the preceding layer by 25 to 90% at an angle of wrap of 5° to 15°, winding a reinforcing layer of a transparent cellulose film from 2 to 6 inches wide over the resin impregnated layers, heat treating the cylinder thus wrapped with the cellulose film at a temperature ranging from 212° to 300° F. for 2 to 8 hours to harden the layers of tape, grinding or tooling the outer surface of the cylinder thus heated to uniform surface and to remove the transparent cellulose film therefrom, applying a specially formulated rubber cover over the outer surface thus obtained after removal of the cellulose film, heat treating the rubber cover at 270° to 300°F. for 8 to 20 hours to promote vulcanization and adhesive reaction, redrilling the drainage holes of the cylinder thus completed to restore their normal extension from the inner surface of the metal cylinder to the outer surface of the newly bonded rubber cover, and boring the inside diameter of the metal shell to a uniform surface. The process also provides a good bonding of a rubber cover to the outer surface of the cylinder of the press shell. And, a press shell obtained by the above process.
Inventors
- 👤 Sidney Stewart Harrowing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/08; D21F3/083; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1057; Y10T29/00; Y10T29/49; Y10T29/49544; Y10T29/49545; Y10T29/49718; Y10T29/49746; Y10T29/4981; Y10T29/49826; Y10T29/49861
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
313 words
A process for restoring a suction press shell used in the removal of water in the formation of paper sheets, said shell consisting of a metal cylinder bonded with a rubber cover and perforated by multiple drainage holes which extend from the inner surface to the outer surface of the shell, the inner surface of the metal cylinder being worn and having lost its uniform aspect, the process comprising the steps of: cleaning and roughening the outer metal surface of the cylinder, winding under tension on the outer surface of the cylinder successive layers of a woven glass or synthetic fibre tape from 2 to 6 inches wide after impregnating the tape with a concentration of 35 to 55% of thermosetting resin until the required thickness of the tape for stiffening the cylinder within acceptable deflection limits is reached, each layer of tape overlapping the preceding layer by 25 to 90% at an angle of wrap of 5° to 15°, winding a reinforcing layer of a transparent cellulose film from 2 to 6 inches wide over the resin impregnated layers, heat treating the cylinder thus wrapped with the cellulose film at a temperature ranging from 212° to 300°F. for 2 to [hours to harden said layers of tape, grinding or tooling the outer surface of the cylinder thus heated to uniform surface and to remove the transparent cellulose film therefrom, applying a specially formulated rubber cover over the outer surface thus obtained after removal of the cellulose film, heat treating the rubber cover at 270° to 300°F. for 8 to 20 hours to promote vulcanization and adhesive reaction, redrilling the drainage holes of the cylinder thus completed to restore their normal extension from the inner surface of the metal cylinder to the outer surface of the newly bonded rubber cover, and boring the inside diameter of the metal shell to a uniform surface.
Claim 2
Dependent Claim
313 words
A process for restoring a suction press shell used in the removal of water in the formation of paper sheets, said shell consisting of a metal cylinder bonded with a rubber cover and perforated by multiple drainage holes which extend from the inner surface to the outer surface of the shell, the inner surface of the metal cylinder being worn and having lost its uniform aspect, the process comprising the steps of: cleaning and roughening the outer metal surface of the cylinder, winding under tension on the outer surface of the cylinder successive layers of a woven glass or synthetic fibre tape from 2 to 6 inches wide after impregnating the tape with a concentration of 35 to 55% of thermosetting resin until the required thickness of the tape for stiffening the cylinder within acceptable deflection limits is reached, each layer of tape overlapping the preceding layer by 25 to 90% at an angle of wrap of 5° to 15°, winding a reinforcing layer of a transparent cellulose film from 2 to 6 inches wide over the resin impregnated layers, heat treating the cylinder thus wrapped with the cellulose film at a temperature ranging from 212° to 300°F. for 2 to [hours to harden said layers of tape, grinding or tooling the outer surface of the cylinder thus heated to uniform surface and to remove the transparent cellulose film therefrom, applying a specially formulated rubber cover over the outer surface thus obtained after removal of the cellulose film, heat treating the rubber cover at 270° to 300°F. for 8 to 20 hours to promote vulcanization and adhesive reaction, redrilling the drainage holes of the cylinder thus completed to restore their normal extension from the inner surface of the metal cylinder to the outer surface of the newly bonded rubber cover, and boring the inside diameter of the metal shell to a uniform surface.
Claim 3
Dependent Claim
93 words
A process according to claim 1, wherein: said woven glass or synthetic fibre tape is 4 inches wide, wherein the concentration of the thermosetting resin is 40%, and wherein each layer of said tape overlaps the preceding layer by 50% at an angle of wrap of 13°, the preceding layer by 50% at an angle of wrap of 13°, the transparent cellulose film is 4 inches wide, the temperature of the heat for treating the cylinder is 300°, the heat for treating the rubber cover to promote vulcanization and adhesive reaction is 280°.
Claim 4
Dependent Claim
18 words
A process according to claim 1, wherein said woven glass or synthetic fibre tape is 4 inches wide.
Claim 5
Dependent Claim
17 words
A process according to claim 1, wherein the concentration of the thermosetting resin is 35 to 40%.
Claim 6
Dependent Claim
15 words
A process according to claim 4, wherein, the concentration of the thermosetting resin is 40%.
Claim 7
Dependent Claim
29 words
A process according to claim 1, wherein each layer of said tape overlaps the preceding layer by 35 to 50% and the angle of wrap is 10° to 15°.
Claim 8
Dependent Claim
25 words
A process according to claim 6, wherein each layer of said tape overlaps the preceding layer by 50% and the angle of wrap is 13°.
Claim 9
Dependent Claim
15 words
A process according to claim 1, wherein the transparent cellulose film is 4 inches wide.
Claim 10
Dependent Claim
18 words
A process according to claim 1, wherein the temperature of the heat for treating the cylinder is 300°.
Claim 11
Dependent Claim
22 words
A process according to claim 1, wherein the heat for treating the rubber cover to promote vulcanization and adhesive reaction is 280°.
Claim 12
Dependent Claim
21 words
A process according to claim 1, wherein said specially formulated rubber cover consists of a rubber employing a peroxide vulcanization system.
Claim 13
Dependent Claim
24 words
A process according to claim 1, wherein the cleaning and roughening step is performed by blasting using either angular steel or aluminum oxide grit.
Claim 14
Dependent Claim
298 words
A process for restoring a suction press shell used in the removal of water in the formation of paper sheets, said shell consisting of a metal cylinder bonded with a rubber cover and perforated by multiple drainage holes which extend from the inner surface to the outer surface of the shell, the rubber cover having lost its bond with the outer metal surface of the cylinder, the process comprising the steps of: cleaning and roughening the outer metal surface of the cylinder, winding under tension on the outer surface of the cylinder successive layers of a woven glass or synthetic fibre tape from 2 to 6 inches wide after impregnating the tape with a concentration of 35 to 55% of thermosetting resin until the required thickness for stiffening the cylinder within acceptable deflection limits is reached, each layer of tape overlapping the preceding layer by 25 to 90% at an angle of wrap of 5° to 15°, winding a reinforcing layer of a transparent cellulose tape from 2 to 6 inches wide over the resin impregnated layers, heat treating the cylinder thus wrapped with the cellulose film at a temperature ranging from 212° to 300°F. for 2 to 8 hours to harden said layers of tape, grinding or tooling the outer surface of the cylinder thus heated to uniform surface and to remove the transparent cellulose film therefrom, applying a specially formulated rubber cover over the outer surface thus obtained after removal of the cellulose film, heat treating the rubber cover at 270° to 300°F. for 8 to 20 hours to promote vulcanization and adhesive reaction, redrilling the drainage holes of the cylinder thus completed to restore their normal extension from the inner surface of the metal cylinder to the outer surface of the newly bonded rubber cover.
Claim 15
Dependent Claim
298 words
A process for restoring a suction press shell used in the removal of water in the formation of paper sheets, said shell consisting of a metal cylinder bonded with a rubber cover and perforated by multiple drainage holes which extend from the inner surface to the outer surface of the shell, the rubber cover having lost its bond with the outer metal surface of the cylinder, the process comprising the steps of: cleaning and roughening the outer metal surface of the cylinder, winding under tension on the outer surface of the cylinder successive layers of a woven glass or synthetic fibre tape from 2 to 6 inches wide after impregnating the tape with a concentration of 35 to 55% of thermosetting resin until the required thickness for stiffening the cylinder within acceptable deflection limits is reached, each layer of tape overlapping the preceding layer by 25 to 90% at an angle of wrap of 5° to 15°, winding a reinforcing layer of a transparent cellulose tape from 2 to 6 inches wide over the resin impregnated layers, heat treating the cylinder thus wrapped with the cellulose film at a temperature ranging from 212° to 300°F. for 2 to 8 hours to harden said layers of tape, grinding or tooling the outer surface of the cylinder thus heated to uniform surface and to remove the transparent cellulose film therefrom, applying a specially formulated rubber cover over the outer surface thus obtained after removal of the cellulose film, heat treating the rubber cover at 270° to 300°F. for 8 to 20 hours to promote vulcanization and adhesive reaction, redrilling the drainage holes of the cylinder thus completed to restore their normal extension from the inner surface of the metal cylinder to the outer surface of the newly bonded rubber cover.
Claim 16
Dependent Claim
81 words
A process according to claim 13, wherein: said woven glass or synthetic fibre tape is 4 inches wide, wherein the concentration of the thermosetting resin is 40% and wherein each layer of said tape overlaps the preceding layer by 50% at an angle of wrap of 13°, the transparent cellulose film is 4 inches wide, the temperature of the heat for treating the cylinder is 300°, the heat for treating the rubber cover to promote vulcanization and adhesive reaction is 280°.
Claim 17
Dependent Claim
18 words
A process according to claim 13 wherein said woven glass or synthetic fiber tape is 4 inches wide.
Claim 18
Dependent Claim
17 words
A process according to claim 13, wherein the concentration of the thermosetting resin is 35 to 40%.
Claim 19
Dependent Claim
15 words
A process according to claim 16 wherein, the concentration of the thermosetting resin is 40%.
Claim 20
Dependent Claim
29 words
A process according to claim 13, wherein each layer of said tape overlaps the preceding layer by 35 to 50% and the angle of wrap is 10° to 15°.
Claim 21
Dependent Claim
25 words
A process according to claim 18 wherein each layer of said tape overlaps the preceding layer by 50% and the angle of wrap is 13°.
Claim 22
Dependent Claim
15 words
A process according to claim 13, wherein the transparent cellulose film is 4 inches wide.
Claim 23
Dependent Claim
18 words
A process according to claim 13 wherein the temperature of the heat for treating the cylinder is 300°.
Claim 24
Dependent Claim
22 words
A process according to claim 13 wherein the heat for treating the rubber cover to promote vulcanization and adhesive reaction is 280°.
Claim 25
Dependent Claim
21 words
A process according to claim 13, wherein said specially formulated rubber cover consists of a rubber employing a peroxide vulcanization system.
Claim 26
Dependent Claim
24 words
A process according to claim 13 wherein the cleaning and roughening step is performed by blasting using either angular steel or aluminum oxide grit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |