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Continuous digester rapid thinning, TAPPI Journal June 2024

ABSTRACT: Carbon steel continuous digesters built after the early 1980s are fully stress relieved, so stress corrosion cracking has been less of a concern. However, these newer digesters were designed to run modified cooking processes that have turned out to be much more corrosive than those running with conventional cooking. This corrosion is mainly associated with softwood digesters and appears to be flow related. Average corrosion rates of 40 mil/year are possible on the exposed shell between the wash and extraction screens. The corrosion patterns are visually distinct from surfaces in the upper digester and below the wash screens. This paper goes into practical detail on where it occurs, the causes, visual identification, inspection planning and results evaluation, and finally, how to mitigate this damage, which consists of applying a corrosion resistant barrier. Some discussion on dealing with general corrosion throughout the digester is included.

Journal articles
Magazine articles
Structured Tissue Markets a Mixed Bag Globally, Tissue360º S

Structured Tissue Markets a Mixed Bag Globally, Tissue360º Spring/Summer 2013

Journal articles
Magazine articles
Structured Technologies Continue Evolving, Growing in N.A. P

Structured Technologies Continue Evolving, Growing in N.A. Premium Tissue Markets, Tissue360º Spring/Summer 2013

Journal articles
Magazine articles
Healthy european Tissue and Towel Market driven by growth in

Healthy european Tissue and Towel Market driven by growth in Per Capita Consumption, Tissue360º Fall/Winter 2014

Journal articles
Magazine articles
ST Tissue Producing 310-in Semi-Creped Parent Reels on Reco

ST Tissue Producing 310-in Semi-Creped Parent Reels on Reconfigured UFS Machine in Virginia, Tissue360º Fall/Winter 2013

Journal articles
Magazine articles
Cascades TM 4 at Candiac uses hybrid Technology to Make Prem

Cascades TM 4 at Candiac uses hybrid Technology to Make Premium Tissue with up to 100% recycled Fiber, Tissue360º Fall/Winter 2012

Journal articles
Magazine articles
How to Reduce CO2 Emissions from Tissue Machines, Tissue360º Fall/Winter 2020

How to Reduce CO2 Emissions from Tissue Machines, Tissue360º Fall/Winter 2020