US4549930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uncoated paper web for printing and method for making and using same
Assignee: Stora Feldmuehle AG
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Filing: 1980-04-02
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Granted: 1985-10-29
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Expires: 2000-04-02
Abstract
Abstract An uncoated paper web suitable for rotogravure printing with water-immiscible solvent-containing inks, the fibers of the web being partially or totally enveloped with a clay hydrogel, the clay being hydratable, colloidal and film-forming. The web provides superior printing results in rotogravure printing. A method for printing the web is disclosed.
Inventors
- 👤 Guido Dessauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:41
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/26; B41M1/36; D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/68
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
In a method for rotogravure printing on a paper using a printing ink containing water-immiscible solvents, the improvement which comprises the paper comprising a fibrous paper web, the fibers of which are partially or totally enveloped with a coating of a clay hydrogel which clay is hydratable, is colloidal and is film-forming, said web having an area weight of from about 45 to 100 g/m 2 , a density of from about 0.95 to 1.2 g/cc and a smoothness of from about 600 to 1500 Bekk seconds and containing conventional inorganic fillers in amounts of more than 15% by weight expressed as the ash content wherein the hydratable, film-forming, colloidal clay contains a montmorillonite mineral selected from the group consisting of minerals in which the ratio of sodium and calcium is between 40:60 and 60:40 and minerals whose ion portion is composed of up to 40% magnesium ions with the remainder of the ion portion being sodium ions.
Claim 2
Dependent Claim
158 words
In a method for rotogravure printing on a paper using a printing ink containing water-immiscible solvents, the improvement which comprises the paper comprising a fibrous paper web, the fibers of which are partially or totally enveloped with a coating of a clay hydrogel which clay is hydratable, is colloidal and is film-forming, said web having an area weight of from about 45 to 100 g/m 2 , a density of from about 0.95 to 1.2 g/cc and a smoothness of from about 600 to 1500 Bekk seconds and containing conventional inorganic fillers in amounts of more than 15% by weight expressed as the ash content wherein the hydratable, film-forming, colloidal clay contains a montmorillonite mineral selected from the group consisting of minerals in which the ratio of sodium and calcium is between 40:60 and 60:40 and minerals whose ion portion is composed of up to 40% magnesium ions with the remainder of the ion portion being sodium ions.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the clay is present in an amount of from about 1.2 to 8 weight percent, based on the total weight of the paper.
Claim 4
Dependent Claim
23 words
The method of claim 1 or 2 wherein the clay is selected from the group consisting of bentonite, attapulgite, sepiolite, and mixtures thereof.
Claim 5
Dependent Claim
26 words
The method of claim 1 or 2 wherein conventional inorganic fillers are present in amounts of more than 15% by weight expressed as the ash content.
Claim 6
Dependent Claim
39 words
The method of claim 1 or 2 wherein conventional inorganic fillers are present in amounts of more than 15% by weight expressed as the ash content, selected from the group consisting of kaolin, calium carbonate, talc and titanium dioxide.
Claim 7
Dependent Claim
24 words
The method of claim 1 or 2 wherein the chemical woodpulp content, based on the total amount of fibrous material, is greater than 10%.
Claim 8
Dependent Claim
83 words
The method of claim 1 or 2 wherein the paper has an area weight of about 55 to 70 g/m 2 , a density of about 1.0 to 1.15 g/cc, a Bekk smoothness of 900 to 1,200 seconds and the following composition: 75 to 80 weight percent of mechanical woodpulp, 20 to 25 weight percent of chemical woodpulp, 18 to 26 weight percent of kaolin, and 1.6 to 3.5 weight percent of hydratable, colloidal, film-forming clays, based on the total weight of material.
Claim 9
Dependent Claim
27 words
The method of claim 1 or 2 wherein macromolecules of polyglycols with a molecular weight of 5,000 to 100,000 are connected to the hydratable, film-forming, colloidal clays.
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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |