US3886017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiberboard carton product and method of manufacture
Assignee: Westvaco Corp
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Filing: 1973-09-20
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Granted: 1975-05-27
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Expires: 1993-09-20
Abstract
Abstract A moisture vapor impermeable sheet for the fabrication of hygroscopic particulate material container cartons having small cross-machine direction curl propensity, said sheet being a lamination of a thin film of thermoplastic material between opposite laminae of high and low density cellulosic fiber sheets, the low density sheet being permeated with water subsequent to lamination and reeled in a straight line cross-direction configuration for at least 20 minutes.
Inventors
- 👤 Jr Latane D Brugh
- 👤 Jr John W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:01
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/26; B41M1/36; B31; B31F; B31F5/00; B41M7/00; B41M7/0027; D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/18; D21H19/20; D21H19/22; D21H19/24; D21H19/30; D21H27/00; D21H27/30; D21H27/32; D21H27/34; D21H27/36; D21H11/00; D21H11/02; D21H11/04; D21H11/14; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/63; D21H17/67; D21H17/68; D21H23/00; D21H23/02; D21H23/22; D21H23/46; D21H23/48; D21H23/52; D21H23/56; D21H23/58; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
THE PROCESS OF REDUCING THE TENDENCY OF A LAMINATED SHEET MATERIAL TO CURL IN THE CROSS-MACHINE DIRECTION, SAID PROCESS COMPRISING: A. PRODUCING A LAMINATED SHEET BY PRESSING A SUBSTANTIALLY 7.1 TO 21.8 NO./REAM LAYER OF VISCOUS THERMOPLASTIC BETWEEN A SUBSTANTIALLY 10 TO 16 CALIPER THICKNESS OF SUBSTANTIALLY 10.0 AND 11.6 NO./REAM/CALIPER DENSITY CELLULOSIC FIBER SHEET AND A SUBSTANTIALLY 8 TO 27 CALIPER THICKNESS OF 8.5 TO 9.0 NO./REAM/CALIPER DENSITY CELLULOSIC FIBER SHEET FORMED FROM UNBLEACHED SULPHATE PULP,
Claim 2
Dependent Claim
77 words
THE PROCESS OF REDUCING THE TENDENCY OF A LAMINATED SHEET MATERIAL TO CURL IN THE CROSS-MACHINE DIRECTION, SAID PROCESS COMPRISING: A. PRODUCING A LAMINATED SHEET BY PRESSING A SUBSTANTIALLY 7.1 TO 21.8 NO./REAM LAYER OF VISCOUS THERMOPLASTIC BETWEEN A SUBSTANTIALLY 10 TO 16 CALIPER THICKNESS OF SUBSTANTIALLY 10.0 AND 11.6 NO./REAM/CALIPER DENSITY CELLULOSIC FIBER SHEET AND A SUBSTANTIALLY 8 TO 27 CALIPER THICKNESS OF 8.5 TO 9.0 NO./REAM/CALIPER DENSITY CELLULOSIC FIBER SHEET FORMED FROM UNBLEACHED SULPHATE PULP,
Claim 3
Dependent Claim
77 words
In combination with a process for producing laminated sheet of high density cellulosic fiber material and low density cellulostic fiber material: the improvement comprising; a. substantially exclusively applying with substantial uniformity over the surface of said laminated sheet on the low density face thereof 0.9 to 2.5 No./ream of water; b. winding successively juxtaposed layers of said sheet into a configuration having straight line surface elements; and c. retaining said wound configuration for at least 15 minutes.
Claim 4
Dependent Claim
77 words
In combination with a process for producing laminated sheet of high density cellulosic fiber material and low density cellulostic fiber material: the improvement comprising; a. substantially exclusively applying with substantial uniformity over the surface of said laminated sheet on the low density face thereof 0.9 to 2.5 No./ream of water; b. winding successively juxtaposed layers of said sheet into a configuration having straight line surface elements; and c. retaining said wound configuration for at least 15 minutes.
Claim 5
Dependent Claim
33 words
The improved process as described by claim 1 including the step of forming said low density sheet from unbleached sulphate pulp furnish, at least 40 to 60% of which is virgin hardwood fiber.
Claim 6
Dependent Claim
36 words
The improved process as described by claim 2 wherein said laminated sheet is a continuously traveling web of indefinite length and said water is applied by passing said web over a water film coated gravure cylinder.
References Cited (Backward Citations)
US3134834A
Cited
US3194474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |