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US 2006/0213630 A1Published application
Method for making a low density multi-ply paperboard with high internal bond strength
OwnerDaniel Bunkerinventor
Life of this patent
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Abstract
Methods for improving the internal bond strength of paperboard with greater than 25 percent crosslinked fiber in at least one ply are described. In the methods, additives are added to the slurry in various combinations and order while maintaining the ionic demand of the slurry at less than zero. Paperboard with high ZDT, Scott Bond and Taber Stiffness is obtained.
Claims21
A method for forming a paperboard comprising the steps of:
- forming a slurry of cellulose fibers comprising crosslinked fibers;
- adding a cationic fixative and mixing with said slurry;
- adding an anionic starch subsequent to adding said cationic fixative;
- adding a cationic starch subsequent to adding said anionic starch;
- wherein, after each addition step, the slurry ionic demand is less than zero;
- forming a fibrous web layer by withdrawing liquid from said slurry;
- drying said web to form a paperboard.
4 more elements
A method for forming a paperboard comprising the steps of:
- forming a slurry of cellulose fibers comprising crosslinked fibers;
- adding a cationic fixative and mixing with said slurry;
- adding an anionic starch subsequent to adding said cationic fixative;
- wherein, after each addition step, the slurry ionic demand is less than zero;
- forming a fibrous web layer by withdrawing liquid from said slurry;
- drying said web to form a paperboard.
3 more elements
A method for forming a paperboard comprising the steps of:
- forming a slurry of cellulose fibers comprising crosslinked fibers;
- adding a cationic starch and mixing with said slurry;
- adding an anionic starch subsequent to adding said cationic fixative;
- wherein, after each addition step the slurry ionic demand is less than zero;
- forming a fibrous web layer by withdrawing liquid from said slurry;
- drying said web to form a paperboard.
3 more elements
Dependencies are inferred from the claim text.