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Paper or paperboard laminate and method to produce such a laminate

  • US 6,537,680 B1
  • Filed: 02/27/2001
  • Issued: 03/25/2003
  • Est. Priority Date: 09/03/1998
  • Status: Expired due to Term
First Claim
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1. Paper or paperboard laminate composed of at least one bulk-promoting layer, and on at least one side of said bulk layer at least one secondary layer, said secondary layer and said bulk layer being joined to one another directly or indirectly over basically the whole of their surfaces facing one another, wherein 40-95% of said bulk layer consists of cellulose fibers with a freeness of 550-950 ml CSF, said at least one secondary layer having a greater density than said bulk layer, and said laminate having a bending stiffness index higher than 2.5 Nm7/kg3, but less than 14 Nm7/kg3, calculated as a geometric mean value for machine and transverse direction.

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