New Insights into Gap Forming of Lightweight Containerboard, 2011 PaperCon Conference

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This presentation gives new insights into high-speed gap forming of lighter weight containerboard. A relationship between the forming roll wrap angle, forming roll capacity, and basis weight is established. The impact of headbox design and consistency together with forming roll dewatering on web properties will be discussed. The effect of machine speed on containerboard properties and dewatering capacity will also be examined.

Power consumption of the forming section will be studied as an entity consisting of pumping energy, vacuum system, and drives. When minimizing the total costs, the lifetime of forming fabrics is also considered.

The paper will also present experiences of production machines.