US3773587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of corrugated board
Assignee: Domtar Inc
•
Filing: 1971-07-01
•
Granted: 1973-11-20
•
Expires: 1991-07-01
Abstract
Abstract Corrugated medium is made by passing a dry formed, substantially non-consolidated, fibrous web between corrugated rolls to corrugate the web longitudinally and to effect bonding of the fibres thereby to consolidate the web in corrugated form.
Inventors
- 👤 H Flewwelling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:55
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/22; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/101
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A method of making a combined board including a corrugated medium and at least one liner which comprises dry forming a web of intermingled fibres which are capable of moving relative to one another within said web when subjected to forming stresses, pressing said web between a pair of rolls having flutes with their longitudinal axis extending circumferentially of the rolls thereby to form said web with corrugations extending longitudinally of said web and to press said fibres together and to consolidate said fibres into a corrugated web configuration and securing a liner to the tips of the corrugations on one side of said corrugated web.
Claim 2
Independent Claim
106 words
A method of making a combined board including a corrugated medium and at least one liner which comprises dry forming a web of intermingled fibres which are capable of moving relative to one another within said web when subjected to forming stresses, pressing said web between a pair of rolls having flutes with their longitudinal axis extending circumferentially of the rolls thereby to form said web with corrugations extending longitudinally of said web and to press said fibres together and to consolidate said fibres into a corrugated web configuration and securing a liner to the tips of the corrugations on one side of said corrugated web.
Claim 3
Dependent Claim
38 words
A method as defined in claim 1 wherein said receiving comprises applying adhesive to the tips of the corrugations on said one surface of the medium and applying a liner to said tips to form a single face.
Claim 4
Dependent Claim
31 words
A method as defined in claim 2 comprising applying adhesive to the crests of corrugations on the opposite side of said medium and securing a second liner to said opposite side.
Claim 5
Dependent Claim
12 words
A method as defined in claim 1 wherein said rolls are heated.
Claim 6
Dependent Claim
12 words
A method as defined in claim 2 wherein said rolls are heated.
Claim 7
Dependent Claim
43 words
A method as defined in claim 1 wherein said corrugator rolls are at a temperature and pressure equivalent to a temperature of 130* to 270* C with a pressure in the range of 500 to 6,000 p.l.i. for a speed of 25 ft/min.
Claim 8
Dependent Claim
43 words
A method as defined in claim 2 wherein said corrugator rolls are at a temperature and pressure equivalent to a temperature of 130* to 270* C with a pressure in the range of 500 to 6,000 p.l.i. for a speed of 25 ft/min.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |