Filters
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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
Measuring wound-in tension - WIT-WOT and gap test methods
Among the most important factors determining the quality of a finished paper roll is consistent roll structure. Wound-in tension is the most important component of roll structure. The WIT-WOT and Gap Test are methods of measuring wound-in tension.
Insights ● Article
Headbox apron shower troubleshooting variables, and a case study
The key word in papermaking is uniformity, and the apron shower plays a primary role in maintaining this characteristic. Shower water volume, pressure and temperature are critical factors. The case study involves the three indicators of a thermal bow problem in the apron lip.
Insights ● Article
Roll grinding procedures, wheels, belts, setup, end relief, tips
Successful roll grinding depends on many factors. The knowledge and experience of an operator, the condition of the roll grinding equipment, and continued preventive maintenance of equipment, all contribute to the ability to meet dimensional tolerances and surface finish requirements.
Insights ● Article
Saturated steam enthalpy table, steam mechanism, optimizing tips
At the end of this article is a typical enthalpy table for saturated steam. You can use this type of chart to determine what the temperature is inside a dryer can at a given pressure. We also provide some tips for sizing lines, measuring temperature and monitoring condensate pressure.
Insights ● Article
Example equipment update analysis - rebuild/replace/add a winder?
When examining an older piece of equipment that does not meet today’s performance requirements, a mill must determine if it should be rebuilt or replaced.
Insights ● Article
