Stock material or miscellaneous articles – Hollow or container type article – Paper containing
Reexamination Certificate
2005-07-19
2005-07-19
Nolan, Sandra M. (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Paper containing
C229S005810, C229S005840, C428S511000, C428S514000, C428S537500
Reexamination Certificate
active
06919111
ABSTRACT:
An improved paperboard has been bulk enhanced by retaining a substantial portion of bulk-enhanced additives including expandable microspheres in a suitable distribution within the paperboard. The cellulosic paperboard web has an overall fiber weight (w) of at least 40 lbs. per 3000 square feet and, at a fiber density of 3, 4.5, 6.5, 7, 8.3, and 9 pounds per 3000 square foot ream at a fiberboard thickness of 0.001 inches, has a GM Taber stiffness of at least about 0.00246 w2.63grams-centimeter/fiber mat density1.63, and a GM tensile stiffness of at least about 615+13.18 w pounds per inch. The high retention of the bulk enhancing additives is believed to result from the incorporation of suitable retention aids. The resulting paperboard has better GM Taber stiffness values and GM tensile stiffness than prior art paperboards. The paperboard also has increased strain to failure and is able to be formed into suitable paperboard containers without loss of integrity. The resulting containers have increased hold times when they contain hot or cold food or drink.
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Hartjes Timothy P.
Sandstrom Erland R.
Shanton Kenneth J.
Swiontek Anthony J.
Swoboda Dean P.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Fort James Corporation
Nolan Sandra M.
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