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Troubleshooting doctors: loading, wear and roll surface marking

Some doctor problems are rather straight forward, readily recognized, and corrected. However, occasionally one will crop up that seemingly has no solution.

Planning roll maintenance yields the best uptime and efficiency

Operating machines at high speeds, longer operation periods between shutdowns and higher operating efficiency requires a planned roll maintenance policy.

Ten step procedure for patch repair of rubber roll covers

The trick is don’t rush the job; take your time and keep the patch area clean. You’ll need a Dremel, heating platen and uncured, un-vulcanized rubber stock.

SymSizer/OptiSizer beam setup, after applicator roll change

SymSizer or OptiSizer beam setup is required after every applicator roll change or whenever you feel there is an issue with starch/coating application. The goal is to set the applicator beam parallel with the new applicator roll.

Steam & condensate 1 - overview, glossary and water evaporation

In this first in a two part series, We explain the terminology and working principles of a typical S&C system and how it controls steam pressure for optimum drying over the entire operating range.

Improving reel turnups for low downtime and high paper yield

The reel turnup process must be perfect in order to maintain high quality end product and avoid downtime. Successful turnups share key aspects, while others may benefit from a technology upgrade.

Hydraulic controls improve performance, reliability - case study

In this case study, Valmet helped a northern USA mill upgrade its hydraulic controls to remove obsolescence, while also improving runnability and reliability.

Start with an audit - common reeling problems and their solutions

Valmet offers reel audits and assessments to help fully understand all aspects of a reeling problem. Discussed here are some common items found when Valmet assesses reel operational challenges.

Instructions for safely taking and using calender nip impressions

Nip impressions are usually taken at installation or to investigate causes for poor paper quality. Taking nip impressions is dangerous if not performed correctly, and should only be done by trained personnel.

Winding principles part 1 - TNT overview, effect of web tension

This article is the first in a short series which will explain how web tension, rider roll pressure, and drum torque ratio affect roll quality. Illustrations of key components and control principles will be presented. The series starts with an overview and discussion of web tension.