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US 9,068,292 B2Granted
Uncoated recording media
AssigneeHewlett-Packard Development Company, L.P.
InventorsJohn L. Stoffel, Thomas Roger Oswald, Xulong Fu, Lokendra Pal, Silke Courtenay
Life of this patent
Estimating the term…
Abstract
An uncoated recording medium includes a blend of hardwood and softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, with total fiber content at least 80 wt % of the medium's total wt %. Hardwood fibers range from about 20 wt % to about 70 wt %, softwood fibers range from about 30 wt % to about 50 wt %, and TMP fibers range from about 10 wt % to about 30 wt %, all relative to the total fiber content. A TiO2 amount ranges from about 1.5 wt % to about 6 wt % of the total wt %, and a bivalent or multivalent salt amount ranges from about 6,000 to about 16,000 μg/gram of the medium. The basis weight ranges from about 45 g/m2 to about 63 g/m2.
Claims34
An uncoated recording medium, comprising:
- a blend of hardwood chemical pulp fibers, softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, wherein a total fiber content is at least 80 wt % of a total wt % of the uncoated recording medium, and wherein the hardwood chemical pulp fibers are present in an amount ranging from about 20 wt % to about 70 wt % relative to the total fiber content, the softwood chemical pulp fibers are present in an amount ranging from about 30 wt % to about 50 wt % relative to the total fiber content, and the TMP fibers are present in an amount ranging from about 10 wt % to about 30 wt % relative to the total fiber content, and wherein the blend includes a ratio of the hardwood chemical pulp fibers to the softwood chemical pulp fibers to the TMP fibers selected from 40:50:10, 40:30:30, and 20:50:30;
- titanium dioxide present in an amount ranging from about 1.5 wt % to about 6 wt % of the total wt % of the uncoated recording medium;
- and
- a bivalent or multivalent salt present in an amount ranging from about 6,000 μg per gram of the uncoated recording medium to about 16,000 μg per gram of the uncoated recording medium;
- the uncoated recording medium having a basis weight ranging from about 45 g/m2 to about 63 g/m2.
2 more elements
An uncoated recording medium, comprising:
- a blend of hardwood chemical pulp fibers, softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, wherein a total fiber content is at least 80 wt % of a total wt % of the uncoated recording medium, and wherein the hardwood chemical pulp fibers are present in an amount ranging from about 20 wt % to about 70 wt % relative to the total fiber content, the softwood chemical pulp fibers are present in an amount ranging from about 30 wt % to about 50 wt % relative to the total fiber content, and the TMP fibers are present in an amount ranging from about 10 wt % to about 30 wt % relative to the total fiber content;
- titanium dioxide present in an amount ranging from about 1.5 wt % to about 6 wt % of the total wt % of the uncoated recording medium;
- and
- a bivalent or multivalent salt present in an amount ranging from about 6,000 μg per gram of the uncoated recording medium to about 16,000 μg per gram of the uncoated recording medium;
- the uncoated recording medium having a basis weight ranging from about 45 g/m2 to about 63 g/m2;
- wherein when ink is printed on the medium, a percentage of strikethrough of the ink from a front side of the medium to a back side of the medium ranges from about 14% up to 25%;
- and wherein the percentage of strikethrough of the ink, the basis weight, the amount of bivalent or multivalent salt, and the amount of TiO2 satisfy the following equation:
- Ink
-
-
- Strikethrough
-
-
- (
- %
- )
- =
- 0.7348
- +
- (
- -
- 0.00622
- ×
- Basis
-
-
- Wt
-
-
- (
- gsm
- )
- )
- +
- (
- -
- 6.535
-
- E
- -
- 6
- ×
- salt
- (
- µg
- g
- )
- )
- +
- (
- -
- 0.03524
- ×
- TiO
- 2
-
- (
- %
- )
- )
- .
58 more elements
An uncoated recording medium, comprising:
- a blend of hardwood chemical pulp fibers, softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, wherein a total fiber content is at least 80 wt % of a total wt % of the uncoated recording medium, and wherein the hardwood chemical pulp fibers are present in an amount ranging from about 20 wt % to about 70 wt % relative to the total fiber content, the softwood chemical pulp fibers are present in an amount ranging from about 30 wt % to about 50 wt % relative to the total fiber content, and the TMP fibers are present in an amount ranging from about 10 wt % to about 30 wt % relative to the total fiber content;
- titanium dioxide present in an amount ranging from about 1.5 wt % to about 6 wt % of the total wt % of the uncoated recording medium;
- and
- a bivalent or multivalent salt present in an amount ranging from about 6,000 μg per gram of the uncoated recording medium to about 16,000 μg per gram of the uncoated recording medium;
- the uncoated recording medium having a basis weight ranging from about 45 g/m2 to about 63 g/m2;
- wherein when toner is printed on the medium, a percentage of strikethrough of the toner from a front side of the medium to a back side of the medium ranges from about 14% up to 25%;
- and wherein the percentage of strikethrough of the toner, the basis weight, and the amount of TMP fibers satisfy the following equation:
- Toner
-
-
- Strikethrough
-
-
- (
- %
- )
- =
- 0.5885
- +
- (
- -
- 0.17941
- ×
- TMP
-
-
- Fibers
-
-
- (
- %
- )
- )
- +
- (
- -
- 0.005857
- ×
- Basis
-
-
- Wt
-
-
- (
- gsm
- )
- )
- .
46 more elements
An uncoated recording medium, comprising:
- a blend of hardwood chemical pulp fibers, softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, wherein a total fiber content is at least 80 wt % of a total wt % of the uncoated recording medium, and wherein the hardwood chemical pulp fibers are present in an amount ranging from about 20 wt % to about 70 wt % relative to the total fiber content, the softwood chemical pulp fibers are present in an amount ranging from about 30 wt % to about 50 wt % relative to the total fiber content, and the TMP fibers are present in an amount ranging from about 10 wt % to about 30 wt % relative to the total fiber content;
- titanium dioxide present in an amount of about 2.4 wt % of the total wt % of the uncoated recording medium;
- and
- a bivalent or multivalent salt present in an amount of about 14,000 μg per gram of the uncoated recording medium;
- wherein the uncoated recording medium has a basis weight of about 61 g/m2;
- and wherein when ink is printed on the medium, a percentage of strikethrough of the ink from a front side of the medium to a back side of the medium is about 18%.
3 more elements
An uncoated recording medium, comprising:
- a blend of hardwood chemical pulp fibers, softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, wherein a total fiber content is at least 80 wt % of a total wt % of the uncoated recording medium, and wherein the hardwood chemical pulp fibers are present in an amount ranging from about 20 wt % to about 70 wt % relative to the total fiber content, the softwood chemical pulp fibers are present in an amount ranging from about 30 wt % to about 50 wt % relative to the total fiber content, and the TMP fibers are present in an amount ranging from about 10 wt % to about 30 wt % relative to the total fiber content;
- titanium dioxide present in an amount of about 5 wt % of the total wt % of the uncoated recording medium;
- and
- a bivalent or multivalent salt present in an amount of about 6,000 μg per gram of the uncoated recording medium;
- wherein the uncoated recording medium has a basis weight of about 60 g/m2;
- and wherein:
- when ink is printed on the medium, a percentage of strikethrough of the ink from a front side of the medium to a back side of the medium is about 15%;
- or
- when toner is printed on the medium, a percentage of strikethrough of the toner from the front side of the medium to the back side of the medium is about 22%.
6 more elements
An uncoated recording medium, comprising:
- a blend of hardwood chemical pulp fibers, softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, wherein a total fiber content is at least 80 wt % of a total wt % of the uncoated recording medium, and wherein the hardwood chemical pulp fibers are present in an amount ranging from about 20 wt % to about 70 wt % relative to the total fiber content, the softwood chemical pulp fibers are present in an amount ranging from about 30 wt % to about 50 wt % relative to the total fiber content, and the TMP fibers are present in an amount ranging from about 10 wt % to about 30 wt % relative to the total fiber content;
- titanium dioxide present in an amount of about 5 wt % of the total wt % of the uncoated recording medium;
- and
- a bivalent or multivalent salt present in an amount of about 14,000 μg per gram of the uncoated recording medium;
- wherein the uncoated recording medium has a basis weight of about 52 g/m2;
- and wherein:
- when ink is printed on the medium, a percentage of strikethrough of the ink from a front side of the medium to a back side of the medium is about 14%;
- or
- when toner is printed on the medium, a percentage of strikethrough of the toner from the front side of the medium to the back side of the medium is about 23%.
6 more elements
An uncoated recording medium, consisting of:
- a blend of hardwood chemical pulp fibers, softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, wherein a total fiber content is at least 80 wt % of a total wt % of the uncoated recording medium, and wherein the hardwood chemical pulp fibers are present in an amount ranging from about 20 wt % to about 70 wt % relative to the total fiber content, the softwood chemical pulp fibers are present in an amount ranging from about 30 wt % to about 50 wt % relative to the total fiber content, and the TMP fibers are present in an amount ranging from about 10 wt % to about 30 wt % relative to the total fiber content;
- a combination of titanium dioxide and calcium carbonate, an amount of the titanium dioxide ranging from about 1.5 wt % to about 5 wt % of the total wt % of the uncoated recording medium, and an amount of the calcium carbonate ranging from about 3.5 wt % to about 5 wt % of the total wt % of the uncoated recording medium;
- calcium chloride (CaCl2) present in an amount ranging from about 6,000 μg per gram of the uncoated recording medium to about 15,000 μg per gram of the uncoated recording medium;
- and
- optionally a size press starch additive, an internal starch additive, any of alkyl ketene dimer or alkenyl succinic anhydride, or combinations thereof;
- the uncoated recording medium having a basis weight ranging from about 50 g/m2 to about 61 g/m2, and wherein when ink or toner is printed on the medium, a percentage of strikethrough of the ink or toner from a front side of the medium to a back side of the medium ranges from about 14% to 25%.
3 more elements
Dependencies are inferred from the claim text.