US3718536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite board and method of manufacture
Assignee: Thilmany Pulp and Paper Co
•
Filing: 1970-04-22
•
Granted: 1973-02-27
•
Expires: 1990-04-22
Abstract
Abstract A composite board formed from a mass of shredded paper containing thermoplastic material.
Inventors
- 👤 M Downs
- 👤 M Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:23
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/26; B; B27; B27N; B27N3/00; B27N3/007; B27N3/06; B29; B29B; B29B17/00; B29B17/0026; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D21H27/00; D21J; D21J1/00; B29K; B29K2711/00; B29K2711/12; B29K2711/123; B29L; B29L2007/00; B29L2007/002; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10S; Y10S100/00; Y10S100/914
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
A method in accordance with claim 1 wherein the batt is cooled under pressure.
Claim 2
Dependent Claim
42 words
A method in accordance with claim 1 wherein the batt is heated to a temperature between about 280*F. and about 350*F. and pressed at a pressure between about 200 psig and about 25 psig for between about 4 and about 10 minutes.
Claim 3
Dependent Claim
27 words
A method in accordance with claim 3 wherein the batt is cooled to below about 170*F. while maintaining the pressure on the batt above about 65 psig.
Claim 4
Dependent Claim
89 words
A method in accordance with claim 1 wherein the batt is pressed at an elevated temperature above the thermal softening temperature of the thermoplastic material in a first pressing step to consolidate the batt into a preform having a lesser density than the desired composite board, pressing the preform in a second pressing step at an elevated temperature above the thermal softening temperature of the thermoplastic material to consolidate the preform to the desired density, and cooling to below the thermal softening temperature of the thermoplastic material under pressure.
Claim 5
Dependent Claim
46 words
A method in accordance with claim 5 wherein the first pressing step is carried out at a temperature between about 280*F. and about 350*F. at a pressure of between about 60 and about 10 psig for a period of between about 3 and about 10 minutes.
Claim 6
Dependent Claim
50 words
A method in accordance with claim 6 wherein the preform from the first pressing step is pressed in the second pressing step at a temperature between about 280*F. and about 350*F. at a pressure between about 25 psig and about 200 psig for between about 3 and about 8 minutes.
Claim 7
Dependent Claim
54 words
A rigid composite board comprising a compressed and consolidated batt containing at least about 90 percent by weight of discrete paper shreds having a polymerized thermoplastic plastic coating thereon, said batt containing at least about 25 percent by weight thermoplastic material, said paper shreds being bonded together by said plastic to form said batt.
Claim 8
Dependent Claim
45 words
A rigid, composite board in accordance with claim 8 in which the paper shreds include a paper ply having a basis weight of between about 10 and about 200 pounds per 3000 square feet, and a coating of a thermoplastic material on said paper ply.
Claim 9
Dependent Claim
26 words
A rigid composite board in accordance with claim 9 wherein the paper shreds are waste and trim obtained from the manufacture of thermoplastic coated paper products.
Claim 10
Dependent Claim
19 words
A rigid composite board in accordance with claim 10 wherein the thermoplastic material is selected from polyethylene and polypropylene.
References Cited (Backward Citations)
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US2619681A
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US3021244A
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |