Search

Going the Distance with Utah PaperBox’s Trim Removal Solution, Paper360º January/February 2022

Going the Distance with Utah PaperBox’s Trim Removal Solution, Paper360º January/February 2022

ASPI News, Paper360º January/February 2022

ASPI News, Paper360º January/February 2022

Calender barring review with experiences, TAPPI Journal July 2022

ABSTRACT: Excessive calender vibration affects all styles of calender stacks from single to multi-nip, all hard rolls, or a combination of hard and soft rolls. Calender vibration can be forced vibration or self-excited vibration. Forced vibration occurs at the first few harmonics of the calender roll rotational speeds and is caused by imbalance, misalignment, eccentricity, etc. Self-excited vibration, the focus of this paper, occurs at higher frequencies. Feedback paths for self-excited vibration must be understood in order to ameliorate the problem. This is presented in the context of the historical development of the theory of self-excited feedback mechanisms, followed by a survey of self-excited feedback mechanisms in various types of calender stacks. Methodology to determine which feed-back path is present and techniques to control or eliminate the resulting vibration follow. To obtain a flavor of the types of problems faced and practical remedial actions, a variety of experiences with barring issues are provided.

SetPoint: Water We Talking About?, Paper360º July/August 2022

New Standards in Paper Production Water Use, Paper360º July/August 2022

Better Valves Improve Pulp and Paper Mill Safety, Paper360º July/August 2022

Chemical Engineers Have a Role in Process Safety, Paper360º July/August 2022

World’s Largest MVR Evaporation Plant for Sulphite Spent Liquor at Sappi Saiccor Pulp Mill, Paper360º July/August 2022

TAPPI Journal Summaries, Paper360º July/August 2022

TAPPI Journal Summaries, Paper360º July/August 2022

Reliability and Safety Part 2: Reliability Improvements and Risk Reduction, Paper360º July/August 2022