US3969460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber mat curing
Assignee: Champion International Corp
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Filing: 1973-07-18
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Granted: 1976-07-13
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Expires: 1993-07-18
Abstract
Abstract This invention relates to an improvement in consolidating and curing a binder-impregnated fibrous mat to form a consolidated fibersheet or fiberboard comprising hot pressing the mat at a temperature and for a time sufficient to initiate but not to complete cure of the binder, followed by immediately subjecting the mat to post curing at a temperature up to about 350°F. for a time sufficient to complete binder cure and mat consolidation.
Inventors
- 👤 Henry A. Fremont
- 👤 Walter Phalti Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:07
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/20; B27N3/203
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
The method of consolidating and curing a thermosetting binder-impregnated fibrous mat to form a consolidated fiberboard product comprising hot pressing the mat at a temperature of about 400°F. to 550°F. and for about 2 to 10 seconds and sufficient to initiate but not to complete cure of the binder, followed by immediately subjecting the mat to a temperature up to about 350°F. for a time, up to about 5 minutes, sufficient to complete binder cure and mat consolidation.
Claim 2
Independent Claim
78 words
The method of consolidating and curing a thermosetting binder-impregnated fibrous mat to form a consolidated fiberboard product comprising hot pressing the mat at a temperature of about 400°F. to 550°F. and for about 2 to 10 seconds and sufficient to initiate but not to complete cure of the binder, followed by immediately subjecting the mat to a temperature up to about 350°F. for a time, up to about 5 minutes, sufficient to complete binder cure and mat consolidation.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the post curing is carried out at atmospheric pressure.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein the hot pressing and post curing of the fibrous mat are carried out on a continuous basis.
Claim 5
Independent Claim
109 words
The method of consolidating and curing a fibrous mat impregnated with up to about 10% by weight of thermosetting phenol-formaldehyde resin to form a consolidated dimensionally stable fiberboard product having a thickness of from about 0.009 to 0.16 inches in thickness comprising hot pressing the mat at a temperature of about 400°F. to 550°F at a pressure up to about 500 psi for a period of from about 2 to 10 seconds but insufficient to cure the resin and then immediately post curing the mat at a temperature up to about 350°F. and for a time up to about 5 minutes sufficient to complete resin cure and mat consolidation.
Claim 6
Independent Claim
109 words
The method of consolidating and curing a fibrous mat impregnated with up to about 10% by weight of thermosetting phenol-formaldehyde resin to form a consolidated dimensionally stable fiberboard product having a thickness of from about 0.009 to 0.16 inches in thickness comprising hot pressing the mat at a temperature of about 400°F. to 550°F at a pressure up to about 500 psi for a period of from about 2 to 10 seconds but insufficient to cure the resin and then immediately post curing the mat at a temperature up to about 350°F. and for a time up to about 5 minutes sufficient to complete resin cure and mat consolidation.
Claim 7
Dependent Claim
18 words
The process of claim 4 wherein the mat is hot pressed and post cured on a continuous basis.
Claim 8
Dependent Claim
30 words
The process of claim 5 wherein the hot pressing is carried out for a period of about three seconds and post curing is for a period of about five minutes.
References Cited (Backward Citations)
US3493527A
Cited
US3267188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |