Minimizing Variations on the Yankee Dryer, 19TissueCon

In the paper and tissue making processes a fiber dispersion, the furnish, is reconstituted into a uniform sheet of desired properties. Past and recent technical advancements in the headbox and forming section, press section, yankee section as well as in the dry end of the tissue machine aim to promote uniformity and minimize variations.  

Beside better quality of the final product, improved uniformity leads to increased machine efficiency, reduced energy consumption and opens the opportunity for higher machine speeds. 

The yankee dryer is a central part of all common tissue making machines and processes. Its basic design has remained unchanged for over 100 years. For a long time, larger, high performing yankee dryers were supplied only by a few paper machine manufacturers with access to their own specialized foundries. With the development of more reliable, full face thermal spray coatings in the 1990’s also steel fabricated yankee dryers became a viable alternative for the manufacturing of creped tissue papers. Today there are many suppliers of yankees, beside the traditional manufacturers, offering seemingly identical dryers. However, on a more detailed level there are distinctions, that ultimately will make the difference of being able to operate efficiently and at high speed or not. 

his paper will cover some key areas – from the condensate removal system on the inside to the properties of the shell outside surface – that affect the uniformity and thus the performance of the yankee dryer: areas that have been subject to developments and improvements based on research, experience, and feedback from skilled users, from our first yankee dryer in 1891 until present time. 

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