Recording sheet with improved image dry time
This invention is directed to an recording sheet having improved image dry time for use in printing comprising a substrate having in contact with at least one surface thereof one or more water soluble divalent metal salts, preferably admixed with one or more starches, to process of forming such recording sheet, to a method of generating one or more image(s) on said recording sheet in an printing process and to a recording sheet having one or more images on a surface thereof.
1. A recording sheet, comprising:
a substrate comprising ligno cellulosic fibers and having a Hercules Sizing Test Value (“HST”) of from about 20 seconds to about 220 seconds, and from about 0.25 g/m 2 to 1.0 g/m 2 of calcium chloride in contact with at least one surface of said substrate, wherein when the recording sheet is printed on with black ink it has a percent ink transferred (“IT %”) in the range of from 3 to 71, an edge acuity (“EA”) in the range of from 5.9 to 13.8, and an optical density for pigment black (“OD O ”) in the range of from 1.59 to 1.68.
2. The recording sheet of claim 1 wherein said ligno cellulosic fibers comprise a mixture of hardwood and softwood pulp fibers.
3. The recording sheet of claim 1 wherein said substrate has a Gurley porosity of from about 5 sec/100 ml to about 75 sec/100 ml.
4. The recording sheet of claim 1 wherein said substrate has a pore diameter of from about 2.0 to about 3.5.
5. The recording sheet of claim 1 wherein said HST is from about 20 seconds to about 100 seconds.
6. The recording sheet of claim 1 wherein the percent ink transferred (“IT %”) is in the range of from 3 to 50.
7. The recording sheet of claim 6 wherein the percent ink transferred (“IT %”) is in the range of from 3 to 40.
8. The recording sheet of claim 7 wherein the percent ink transferred (“IT %”) is in the range of from 3 to 30.
9. The recording sheet of claim 8 wherein the percent ink transferred (“IT %”) is in the range of from 3 to 20.
10. The recording sheet of claim 1 wherein the edge acuity (“EA”) is in the range of from 5.9 to less than about 12.
11. The recording sheet of claim 1 wherein the edge acuity (“EA”) is in the range of from 5.9 to less than about 10.
12. The recording sheet of claim 11 wherein the edge acuity (“EA”) is in the range of from 5.9 to less than about 8.
13. The recording sheet of claim 1 having a mixture of calcium chloride and at least one of one or more starches, one or more polymeric emulsion additives, one or more nitrogen containing compounds, or a combination thereof on a surface of the substrate.
14. The recording sheet of claim 1 , further comprising one or more starches in contact with the at least one surface of said substrate.
15. A recording sheet, comprising:
a substrate comprising ligno cellulosic fibers and having a Hercules Sizing Test Value (“HST”) of from 47 seconds to 58 seconds; and from 0.2 g/m 2 to 0.8 g/m 2 of calcium chloride in contact with at least one surface of said substrate; and
one or more starches in contact with the at least one surface of said substrate, wherein the one or more starches include ethylated starch;
wherein when the recording sheet is printed on with black ink it has a percent ink transferred (“IT %”) equal to or less than about 50, an edge acuity (“EA”) in the range of from 6.9 to 8.1, and an optical density for pigment black (“OD O ”) in the range of from 1.50 to 1.60.
16. The recording of claim 14 , wherein said one or more starches comprises carbohydrates synthesized in tapioca by polymerization of dextrose units.