US4308320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating and drying paper
Assignee: NewPage Wisconsin System Inc
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Filing: 1980-08-20
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Granted: 1981-12-29
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Expires: 2000-08-20
Abstract
Abstract A coated paper having high bulk, excellent gloss and low surface mottle is prepared by first coating the paper with an aqueous composition containing pigment and a thermoplastic binder. The paper is then initially dried at a temperature of up to about 20° F. above the minimum film-forming temperature of the binder until the moisture content of the sheet reaches from about 8 to about 18% by weight. The drying temperature is then increased to further dry the paper, and the dry coated paper is then calendered.
Inventors
- 👤 Gary G. Schiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:31
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/04; D21H25/06; D21H17/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A method for coating and drying a web of paper comprising the steps of applying a coating to said web, said coating comprising a coating pigment and a thermoplastic polymer having a minimum filmforming temperature (MFFT) of from about 85° to about 135° F., initially drying the web at a web temperature above the MFFT and below 20° F. in excess of the MFFT until the moisture content of the web is from about 8 to about 18 percent by weight, then continuing to dry the web at a temperature higher than the initial web temperature until the final desired degree of dryness is attained, and then calendering the dried coated web.
Claim 2
Independent Claim
112 words
A method for coating and drying a web of paper comprising the steps of applying a coating to said web, said coating comprising a coating pigment and a thermoplastic polymer having a minimum filmforming temperature (MFFT) of from about 85° to about 135° F., initially drying the web at a web temperature above the MFFT and below 20° F. in excess of the MFFT until the moisture content of the web is from about 8 to about 18 percent by weight, then continuing to dry the web at a temperature higher than the initial web temperature until the final desired degree of dryness is attained, and then calendering the dried coated web.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the web is initially dried at a temperature of from about 10° to about 20° above the MFFT of the binder.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said higher temperature is in excess of 20° F. above said MFFT.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the final dryness of the web is from about 4 to 6 percent by weight.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said higher temperature is below about 180° F.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the dried coated web is gloss calendered.
Claim 8
Dependent Claim
8 words
The product of the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |