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Stratified forming

The next quantum leap in papermaking will be the introduction of stratified forming in order to reduce energy consumption, improve product properties and possibly develop completely new products. In contrast to multiply forming, stratified forming produces a layered structure with a single headbox. By using a single headbox, sheet stratification can be applied even to low-grammage products, e.g. newsprint.

Stratified forming with a single headbox

Stratified forming makes it possible to produce printing paper grades with different furnishes in the different layers. Another interesting possibility would be to use wood containing pulp in the middle layer sandwiched between two bleached surface layers, giving the same product properties that can be obtained with 100% virgin kraft pulp today.

For multiple grades, such as liner or board, stratified forming applied on the top ply means added design freedom since different functionalities, for example printing quality, mechanical properties and hydrophobicity, could be introduced to the top layer. Products with these characteristics would bring significant environmental benefits while also providing improved competitiveness.

Contact

Marco Lucisano
+46 768767285
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Paul Krochak
+46 768767372
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Published

A new technique for stratified forming
Söderberg, D.
PaperCon '08, TAPPI, Norcross, GA (2008).

STFI-Packforsk develops new stratification technology
Söderberg, D. (2007). Paper Technology 48(4):13-23.

Modelling of component flows during stratified forming: aspects on retention and layer purity
Östlund, I., Sjöström, L. and Norman, B. (2007). PTS Symposium, 5.1-5.12.

Reduction of layer mixing in stratified forming through hydrodynamic control
Söderberg, D. and Lucisano, M. (2005).
13th Fundamental Research Symposium, Vol. 1, pp. 83-105.

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