PROCESS FOR PREPARING A PAPER SHEET HAVING IMPROVED MECHANICAL PROPERTIES, USEFUL IN PACKAGING AND IN PARTICULAR THAT OF BAGS, AND PAPER SHEET OBTAINED ACCORDING TO THIS PROCESS

摘要

The present invention relates to a novel process for preparing a fibrous sheet by papermaking techniques, at a pH between 6.2 and 9.5 from fibers, a polymeric organic binder of a cationic flocculant, and an agent reducing the adhesion of the sheet to wet presses during its formation. The sheet obtained according to this process, which has an aqueous extract according to standard NF Q 03 005 greater than 7, and which has improved mechanical properties, in particular with regard to the breaking strength, the bursting strength, the impact resistance, energy at break and machinability, is useful in the field of packaging and especially that of paper bags.