The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 17, 2008
Filed:
May. 10, 2001
Leif Norlander, Falun, SE;
Leif Norlander, Falun, SE;
Stora Enso Aktiebolag, Falun, SE;
Abstract
Paper or paperboard laminate composed of at least one bulk-promoting layer, here termed bulk layer (), 40-98% of which is composed of cellulose fibers with a freeness value of 550-950 ml CSF, and on at least one side of the bulk layer at least one secondary layer ('), which has a greater density than the bulk layer, the secondary layer and bulk layer being joined indirectly to one another over basically the whole of their opposing surfaces and the laminate having a bending stiffness index greater than 2.5 Nm/kg, but less than 14 Nm/kg, calculated as a geometric mean value for machine direction and cross direction. According to the invention a thin intermediate layer (), which has a higher drainage resistance than the bulk layer and has been formed together with the bulk layer, is arranged between the said bulk layer () and secondary layer (′).