Parameters affecting the z-strength of liquid paperboard (LPB) has been analyzed and identifiedusing data mining and machine learning on 6 years of operational data from a multi-ply LPB mill, and control and stabilizing of them was proposed. Linear regression models were built for 9 articles with satisfactory results, and whose attributes were further analyzed as the most important parameters for the z-strength. The results show that generally only parameters affecting the weakest position in the paperboard has any influence on the z-strength, with unbleached softwood pulp refining work affecting the strength the most, while bleached hardwood refining work has a lower influence, and refining work of bleached softwood has almost no influence on the z-strength. Among the other parameters shown to influence the z-strength are kappa number, headbox concentration, broke ratio, strength and retention starches, fractionation and degree thereof, and the conductivity of the process water.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-447977 |
| Date | January 2021 |
| Creators | Thaung Tolförs, Gustav |
| Publisher | Uppsala universitet, Tillämpad mekanik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | UPTEC K, 1650-8297 ; 21026 |
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