US3644159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for manufacturing corrugated board
Assignee: PALSON CORP AB
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Filing: 1967-06-13
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Granted: 1972-02-22
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Expires: 1987-06-13
Abstract
Abstract A method and an apparatus for manufacturing corrugated board in which layers of material for the corrugated board are coated with a mixture of a thermoplastic and a wax which can be brought into liquid form and which after melting and setting on the layers keeps said layers together.
Inventors
- 👤 Ake Evald Edkvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:59
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2804; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
The method defined in claim 1 further including the step of preheating said coating at a second station prior to bringing said layers into contact with each other at said first defined station.
Claim 2
Dependent Claim
61 words
The method defined in claim 2 wherein said one layer having the coating is said second layer, the method further including the step of corrugating said second layer at said second station by heated cylinders prior to bringing the layers into said overlying contact to thus effect said preheating step defined in claim 2 while said second layer is being corrugated.
Claim 3
Dependent Claim
36 words
The method defined in claim 1 further including the step of passing the formed corrugated board through a heated area at a third station to be heated further after the layers are moved into overlying contact.
Claim 4
Dependent Claim
55 words
The method defined in claim 4 further including the step of subjecting the formed corrugated board to inward pressure exerted on the opposite sides thereof on said layers generally at right angles to the main plane of the formed corrugated board during passage of the corrugated board through said heated area at said third station.
Claim 5
Dependent Claim
55 words
The method defined in claim 5 further including the step of cooling the formed corrugated board at a fourth station after it leaves said heated area at said third station and while cooling, exerting inward pressure on the opposite sides of the corrugated board in a direction generally at right angles to the main plane.
Claim 6
Dependent Claim
49 words
The method defined in claim 1 further including the step of cooling the formed corrugated board after it leaves said station and simultaneously applying inward pressure to opposite sides of the formed corrugated board in directions extending generally at right angles to the main plane of the corrugated board.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |