Patent ID: 11965291
Assignee: MONDI AG
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D | IPC D

Claim 6:
7. A process for the production of a packaging paper, in which an unbleached kraft pulp consisting of at least 90% of primary pulp, containing at least 80% pulp with an average length-weighted fiber length according to ISO 16065-2:2014 of between 2.0 mm and 2.9 mm and less than 4.5% fillers as well as cationic starch in an amount of 0.5% by weight to 1.5% by weight of the base paper, and other processing agents, with a kappa value according to ISO 302:2015 of between 38 and 60 is used as the base material, wherein the base material is creped in a Clupak plant until an elongation at break in the machine direction according to ISO 1924-3:2005 of between 2.5% and 8.5% is achieved, dried to a moisture content of at most 14% and subjected to a calendering step, that a packaging paper with a Bendtsen roughness according to ISO 8791-2: 2013 of between 70 ml/min and 600 ml/min a basis weight according to ISO 536:2019 of between 60 g/m2 and 150 g/m2 and an air resistance according to ISO 5636-5:2013 (Gurley) of between 5 and 30 seconds is formed, and that optionally at least one one-sided coating of the packaging paper is carried out.