Up and Running articles
Up and Running articles
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Field Report - Understanding coater blade angle vs. loading tube pressure
For a given blade tip bevel, when load tube pressure is increased, the blade angle will decrease, resulting in the blade running on its heel for a while. This, along with the additional bending pressure at the blade tip, will reduce coat weight. It is important to understand the interaction between blade angle, blade tip angle and loading tube pressure.
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Field Report - Coater blade angle measurement and interpretation
Measuring and interpreting coater blade wear angle can avoid problems such as scratching, poor coat weight appearance, wet bleeding and weeping at the blade tip. Correct positioning of the blade on its bevel will optimize sheet smoothness.
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Field Report - Size press roll wear, a case study
A P&W paper machine suffered from excess wear on the back edge of the bottom size press roll. The problem was traced to the size press synchronization shaft. When the shaft was replaced, the roll wear problem went away.
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Field Report - Reel process audits
Reel equipment can take a beating during normal operation. Periodic inspections of the reel equipment are recommended to develop a baseline with regard to its process variables and mechanical condition.
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Field Report - Retention aid induced press wreck, a case study
Papermaking is as much a chemical process as it is a mechanical one. A fine paper machine lost retention aid flow when the pump shut down. The resulting imbalance caused a press wreck when the pump was restarted. Multiple lessons were learned.
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Field Report - Size press edge wipe setup
Improper setup of a size press edge wipe when running starch results in poor doctoring results outside the sheet path. The extension of the wipe past the holder is a critical part of the edge wipe setup.
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Field Report - Measuring applied and residual coat weight on applicator rolls
Starch and coating is applied to the applicator roll using a rotating rod. The amount of coating applied to the roll is the most important variable for good coat weight control. This article describes a method of measuring the wet film on the fly across the size press, using a simple measurement tool.
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Field Report - Saturated steam table & 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.
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Field Report - Dryer steam and condensate system tips
The purpose of a paper machine steam and condensate system is to control steam pressures for optimum drying, provide stable control over the entire operating range and efficiently remove condensate from inside the dryers. This article presents tips for maintaining performance with your S&C systems.
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Valmet Tissue Technology Webinar - learn from the technology leader
Valmet's free webinar is an information packed hour of presentations and Q&A that will bring you up to date on the latest in tissue making technology, from the headbox to the rereeler, including automation that assists operators in making the best decisions.