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Patent US10619306
Issued 2020-04-14
Low Density Paper And Paperboard With Two-sided Coating
A paper or paperboard including a cellulose substrate and a coating applied to each side of the paperboard substrate to form a coated structure, the coated structure having a basis weight, a caliper thickness and a Parker Print Surf smoothness, the Parker Print Surf smoothness being at most about 2 microns, the basis weight being less than about Y1 pounds per 3000 ft2, wherein Y1 is a function of the caliper thickness (X) in points and is calculated as follows:
Y1=29.15+11.95X−0.07415X2.
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- 1. A paperboard comprising:
a solid bleached sulfate (SBS) paperboard substrate having a first side and a second side, wherein said substrate has a basis weight of at least 65 pounds per 3000 ft2; and a first coating applied to said first side and a second coating applied to said second side to form a coated structure, said coated structure having a basis weight, a caliper thickness and a Parker Print Surf smoothness, said Parker Print Surf smoothness of said coated structure being at most 2 microns and said basis weight of said coated structure being less than Y1 pounds per 3000 ft2; wherein Y1 is a function of said caliper thickness (X) in points and is calculated as follows:
Y1=29.15+11.95X−0.07415X2.
- 18. A paperboard comprising:
a solid bleached sulfate (SBS) paperboard substrate having a first side and a second side, wherein said substrate has a basis weight of at least 65 pounds per 3000 ft2, and wherein said substrate is substantially free of chemical bulking agents; and a first coating applied to said first side and a second coating applied to said second side to form a coated structure, at least one of said first coating and said second coating comprising an inorganic pigment, said coated structure having a basis weight, a caliper thickness and a Parker Print Surf smoothness, said Parker Print Surf smoothness of said coated structure being at most 2 microns and said basis weight of said coated structure being less than Y1 pounds per 3000 ft2 and more than Y5 pounds per 3000 ft2, wherein Y1 is a function of said caliper thickness (X) in points and is calculated as follows:
Y1=29.15 +11.95X −0.07415X2, and
wherein Y5 is a function of said caliper thickness (X) in points and is calculated as follows:
Y5=26.15 +10.83X −0.06815X2.
