SURFACE SIZING WITH HIGH NIP PRESSURE, 19PaperCon
Linerboard and fluting have strict requirements on strength and at the same time they are produced from raw materials whose properties have deteriorated over the past years. The OCC based furnish is losing its strength potential as the fiber material is recycled more and more.
Building the strength for recycled base linerboards relies heavily on surface sizing. The sizing technology has remained the same for decades with only minor adaptations done to the equipment. It has been accepted that good sizing result requires deep penetration for the size and that this penetration is mainly dependent on the wetting time in the roll nip.
In the latest development it has been shown that the penetration and sizing effect is much more efficiently achieved utilizing high pressures in the size press nip. This can lead to up to 20% more efficient size usage in the surface sizing unit.
Valmet has developed a new size press concept utilizing hard covered nip rolls and totally new size application equipment which can be utilized forming a film transfer process on the hard rolls.
The new application equipment also eliminates the mixing of furnish impurities into the size circulation. The new equipment has been repeatedly demonstrated at a pilot plant and the first commercial application has been started up in April 2018.
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SURFACE SIZING WITH HIGH NIP PRESSURE, 19PaperCon