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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
Three Questions on Refining: interview with a Valmet expert
Read three highlights of Valmet´s refining technology and learn how we can help you to improve performance and increase efficiency across all refining applications.
Insights ● Article
Improved drying - Reduce thermal resistance with spoiler bars
Spoiler bars increase drying capacity up to 30%, with improved drying uniformity and CD moisture profile control. A kraft bag case study demonstrates.
Insights ● Article
Importance and limits of hardness in wound roll quality
Building a good roll requires controlling hardness. Hardness is dependent on paper characteristics and the tension distribution throughout the wound roll.
Insights ● Article
Observations from the field: improving recovery boiler operations
Are you looking to establish a safer work environment, reduce outage time, make environmental compliance easier, or all of the above? Explore some ready-made services that can help you realize ROI on your energy and recovery goals.
Insights ● Article
Wet end tools for paper/board quality and strength (webinar)
An upcoming webinar describes how each component at the wet end of a paper machine can be operated to optimize the quality and the strength of specific grades.
Insights ● Article
