Advanced Yankee Surface Management, Tissue2017

Management of the Yankee surface, or more specifically, the organic coating on the Yankee surface has a great impact on the operations and maintenance of the tissue machine. Tissue quality and machine productivity are both highly influenced by the composition and also adhesive and rheological properties of this surface. For example, a hard coating will make achievement of the bulk target difficult. Likewise, a lack of adhesion (also a by-product of hard coating in some cases) will give a drop in handfeel or softness. Hard coating at the Yankee edges can give rise to edge tears and web breaks, and a hard coating with poor release response makes achievement of a low crepe ratio difficult. Finally, we have the dreaded specter of chattermarks1, blade-vibration
induced CD scoring of the Yankee surface, causing sheet defects, slow running and ultimately a costly regrind or metallization of the Yankee surface. So clearly, correct management of this thin organic layer is of paramount importance to the majority of tissue makers who use light dry crepe technology.

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