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:
Apr. 24, 2001
Filed:
Dec. 29, 1999
Applicant:
Inventor:
Håkan Sjöström, Örebro, SE;
Assignee:
Stora Kopparbergs Bergslags AB, Falun, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 2/710 ;
U.S. Cl.
CPC ...
D21H 2/710 ;
Abstract
A cardboard with great rigidity and low grammage, as well as a package made thereof, is described. The cardboard consists of a core, which is surrounded by at least one, preferably 1-3 outer plies, on each side. The cardboard has a grammage of 100-300 g/m,, a bending resistance index of at least 25 Nm,/kg,, and a Scott Bond z-strength of at least 100 J/m,. The core of the cardboard consists of chemi-thermomechanical pulp and has a density of 200-450 kg/m,and the core constitutes 55-80% of the total grammage of the cardboard. The outer plies have a tensile stiffness index of 7.0-9.5 kgNm/g and mainly consist of chemical pulp.