US3982056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving the printability characteristics of gloss calendered paper
Assignee: International Paper Co
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Filing: 1974-10-15
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Granted: 1976-09-21
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Expires: 1994-10-15
Abstract
Abstract The printability characteristics of gloss calendered paper coated on one side only is improved by moistening the uncoated side of the paper prior to gloss calendering the paper. Enough liquid must be applied to the uncoated side to raise the overall moisture content to at last about 8.5% and preferably to about 10% or more. The paper is gloss calendered while still wet and before appreciable amounts of the added liquid can migrate to the coated side of the paper. Thus a localized zone of high moisture content is provided at the uncoated side of the paper during the calendering. Under such conditions the gloss calendering produces a paper whose printability characteristics, especially its print smoothness, are better than conventional gloss calendered paper and, under preferred operating conditions, approach or equal those of conventional supercalendered paper. The ability to produce paper of supercalendered printing quality on the less expensive, easier to operate gloss calender is an important advantage, especially since the gloss calenders are normally on line with the coating equipment in paper-making plants while supercalenders are not.
Inventors
- 👤 Charles Delbert Holder, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:39
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/26; B41M1/36; D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/52; D21H23/56; D21H25/00; D21H25/04; D21H25/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
70 words
A process for treating paper coated on one side, which comprises: applying a liquid only to the uncoated side in an amount sufficient to provide a moisture content of about 8.5 to 20% by weight in the paper; and then, gloss calendering the moistened paper with the unmoistened side of the paper pressed against the polished roll of the gloss calender, without moistening the polished roll of the gloss calender.
Claim 2
Dependent Claim
70 words
A process for treating paper coated on one side, which comprises: applying a liquid only to the uncoated side in an amount sufficient to provide a moisture content of about 8.5 to 20% by weight in the paper; and then, gloss calendering the moistened paper with the unmoistened side of the paper pressed against the polished roll of the gloss calender, without moistening the polished roll of the gloss calender.
Claim 3
Dependent Claim
68 words
A process for treating paper coated on one side, which comprises: applying water only to the uncoated side in an amount sufficient to provide a moisture content of about 10 to 20% by weight in the paper; and then, gloss calendering the paper with the unmoistened side of the paper pressed against the polished roll of the gloss calender, without moistening the polished roll of the gloss calender.
Claim 4
Dependent Claim
68 words
A process for treating paper coated on one side, which comprises: applying water only to the uncoated side in an amount sufficient to provide a moisture content of about 10 to 20% by weight in the paper; and then, gloss calendering the paper with the unmoistened side of the paper pressed against the polished roll of the gloss calender, without moistening the polished roll of the gloss calender.
Claim 5
Dependent Claim
14 words
The process of claim 2 wherein the moisture content is about 10 to 15%.
Claim 6
Dependent Claim
107 words
A process for treating paper coated on one side, which comprises: applying water only to the uncoated side in an amount sufficient to provide a moisture content of about 8.5 to 20% by weight; and then, almost immediately, gloss calendering the moistened paper by passing the paper through a nip between a revolving heated roll having a highly polished surface and a deformable revolving roll having a P & J hardness of at least 90 to press the coated side of the paper against the heated roll, the heated roll having a temperature of about 200° to 450°F, without moistening the polished roll of the gloss calender.
Claim 7
Dependent Claim
107 words
A process for treating paper coated on one side, which comprises: applying water only to the uncoated side in an amount sufficient to provide a moisture content of about 8.5 to 20% by weight; and then, almost immediately, gloss calendering the moistened paper by passing the paper through a nip between a revolving heated roll having a highly polished surface and a deformable revolving roll having a P & J hardness of at least 90 to press the coated side of the paper against the heated roll, the heated roll having a temperature of about 200° to 450°F, without moistening the polished roll of the gloss calender.
Claim 8
Dependent Claim
131 words
A process for improving the printability characteristics of paper coated only on one side, which comprises: applying water only to the uncoated side in an amount sufficient to provide an overall moisture content of about 10 to 20% by weight in the paper, the water content of the paper being distributed non-uniformly throughout the paper and the added water forming a localized zone of high moisture content at the uncoated side of the paper; and then, gloss calendering the moistened paper at an overall moisture content of at least about 10% and before a sufficient amount of the added moisture migrates to the coated side of the paper and causes the coating to stick to the polished roll of the gloss calender, without moistening the polished roll of the gloss calender.
Claim 9
Dependent Claim
131 words
A process for improving the printability characteristics of paper coated only on one side, which comprises: applying water only to the uncoated side in an amount sufficient to provide an overall moisture content of about 10 to 20% by weight in the paper, the water content of the paper being distributed non-uniformly throughout the paper and the added water forming a localized zone of high moisture content at the uncoated side of the paper; and then, gloss calendering the moistened paper at an overall moisture content of at least about 10% and before a sufficient amount of the added moisture migrates to the coated side of the paper and causes the coating to stick to the polished roll of the gloss calender, without moistening the polished roll of the gloss calender.
Claim 10
Dependent Claim
14 words
The process of claim 4 wherein the moisture content is about 12 to 20%.
Claim 11
Dependent Claim
18 words
The process of claim 4 wherein the heated roll has a temperature of about 275° to 325° F.
Claim 12
Dependent Claim
16 words
The process of claim 4 wherein the nip pressure is about 250-1500 pounds per linear inch.
Claim 13
Dependent Claim
28 words
The process of claim 4 further including passing the moistened paper through at least one additional nip between the heated roll and at least one additional deformable roll.
Claim 14
Dependent Claim
21 words
The process of claim 9 wherein the nip pressure at each nip is about 500 to 1000 pounds per linear inch.
Claim 15
Dependent Claim
18 words
The process of claim 10 wherein the P & J hardness of said additional roll is about 50-70.
Claim 16
Dependent Claim
80 words
The process of claim 4 wherein the moisture content of the paper is about 12 to 20% and the heated roll has a temperature of about 275° to 325° F., further including passing the moistened paper through at least one additional nip between the heated roll and at least one additional deformable roll having a P & J hardness of about 60 to 70, wherein the nip pressure at each nip is about 250 to 500 pounds per linear inch.
Claim 17
Dependent Claim
170 words
A process for treating paper coated on one side only, which comprises: applying water to only the uncoated side of the paper in an amount sufficient to provide a moisture content of about 8.5 to 20% by weight in the paper; then, advancing the moistened paper, at a speed of about 100 to 3000 feet per minute and a temperature ranging from ambient to about 200°F, to a gloss calender, comprising a revolving drum having a highly polished surface heated to about 200° to 450°F and at least one deformable revolving drum forming a nip with the polished drum, the calender operating at a pressure of about 125 to 1500 pounds per linear inch at the nip and the at least one deformable drum having P & J hardness value of at least about 90; and passing the moistened paper through the nip of the calender to press the coated side of the paper against the surface of the polished drum, without moistening the polished drum of the gloss calender.
Claim 18
Dependent Claim
170 words
A process for treating paper coated on one side only, which comprises: applying water to only the uncoated side of the paper in an amount sufficient to provide a moisture content of about 8.5 to 20% by weight in the paper; then, advancing the moistened paper, at a speed of about 100 to 3000 feet per minute and a temperature ranging from ambient to about 200°F, to a gloss calender, comprising a revolving drum having a highly polished surface heated to about 200° to 450°F and at least one deformable revolving drum forming a nip with the polished drum, the calender operating at a pressure of about 125 to 1500 pounds per linear inch at the nip and the at least one deformable drum having P & J hardness value of at least about 90; and passing the moistened paper through the nip of the calender to press the coated side of the paper against the surface of the polished drum, without moistening the polished drum of the gloss calender.
Claim 19
Dependent Claim
23 words
The process of claim 13 wherein sufficient water is applied to provide a moisture content of about 12 to 20% in the paper.
Claim 20
Dependent Claim
26 words
The process of claim 13 further including the step of reducing the moisture content of the gloss calendered paper to about 6% by weight or less.
Claim 21
Dependent Claim
37 words
The process of claim 5 wherein the overall moisture content of the paper is about 12 to 20% and the moisture content of the coated side is less than about 8% by weight during the gloss calendering.
Claim 22
Dependent Claim
26 words
The process of claim 5 further including the step of reducing the moisture content of the gloss calendered paper to about 6% by weight or less.
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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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |