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AssigneeInternational Paper Company
InventorsKapil Mohan Singh, Alexander A. Koukoulas, Dennis W. Anderson, Phillip Norrdahl, Douglas L. Hamilton
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A paper product suitable for use in making envelopes and the like and having enhanced printability. The enhancement in printability is attained through the use of shoe nip calendering. The final product has the following material properties: (1) a basis weight in the range 16-32 lb./1,300 ft2; (2) a density equal to or less than 0.75 g/cc; (3) a smoothness as measured by the Hagerty/Sheffield test (TAPPI Test Method T 538 om-88) greater than 200 Sheffield units; and (4) a Parker Print Surf roughness as measured by the Parker test (TAPPI Test Method T 555 om-94) less than 5.0 microns (measured using a pressure of 10 kgf/cm2 with a soft backing).
An uncoated paper product having a density equal to or less than 0.75 g/cc and having a finished surface with the following properties:
An uncoated paper product having a density equal to or less than 0.75 g/cc, a Sheffield smoothness of greater than about 200 Sheffield units, and a Parker Print Surf roughness less than about 5.0 microns, and having a surface which is finished by a method comprising the step of extended nip calendaring.
Dependencies are inferred from the claim text.