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Low density paperboard articles

  • US 7,335,279 B2
  • Filed: 09/19/2003
  • Issued: 02/26/2008
  • Est. Priority Date: 01/26/2000
  • Status: Expired due to Term
First Claim
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1. A paperboard material useful in the manufacture of paperboard containers comprising a paperboard web including wood fibers and from about 0.25 to about 10 wt. % dry basis expanded microspheres based on the total weight of the web dispersed within the fibers, an apparent density from about 6.0 to about 10 lb/3MSF/mil, a caliper of from 24 to about 35 mil, an average internal bond of at least about 80×

  • 10

    3
    ft-lbf, a Sheffield Smoothness of about 300 or greater, and a barrier coating having a thickness from about 0.5 to about 3.5 mil disposed adjacent at least one surface of the web.

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