Up & Running articles
Up & Running articles
-
Field Report - Troubleshooting rope runs
Rope runs can be complex, and a poorly designed run can decrease machine complexity. They should be assessed periodically to find and correct problem areas.
-
Field Report - Suction roll bearing vibration, a case study
At a North American mill, analysis of unusually high vibration levels from a suction roll back internal bearing point to a recent speed increase.
-
Field Report - Suction roll bearing maintenance tips
One of the most sensitive components of the roll, the internal bearing is difficult to maintain and unforgiving when it fails. Accelerometers are an effective means of monitoring and predicting suction roll bearing failure.
-
Release coating for drying cylinders Valmet Dryer Roll Cover DOH - a case study
Poor dryer cylinder release causes runnability problems, sheet picking and dusting. At their worst, these problems place limits on cylinder temperatures and operating speeds. Sun Paper overcame these challenges with Valmet Dryer Roll Cover DOH onsite coating and improved their paper quality. Valmet Dryer Roll Cover DOH is based on the latest polymer chemistry, modern thermal spraying technology, and long experience.
-
Valmet Filter Bags deliver the best performance
Valmet is the global market leader in disc filter bags, with over four decades of experience. Our bags fit perfectly, last longer, are durable and easy to install.
-
Production of sulfuric acid from incineration of pulp mill non-condensable gases - a biorefinery concept
The production of sulfuric acid from pulp mill NCG enables a bioproduct mill to become nearly self-sufficient in sulfuric acid usage. Sulfate led to the mill's effluent treatment plant is reduced and the sulfate load to nearby waterways is decreased drastically. This innovative plant can produce sulfuric acid and bisulfite simultaneously depending on the requirement. The internal recycling of chemicals can reduce purchasing by 350 truckloads of acid per year.
-
Field Report - Optimizing drying efficiency
Increased felt tension can optimize drying efficiency and improve paper quality. However, a thorough evaluation of machinery and close monitoring of felt tension, along with a complete maintenance program, are the keys to a headache-free dryer section.
-
Field Report - Increasing felt tension solves dryer limitation problems, a case study
This case study involves a paperboard mill suffering from drying limitations. The mill had added spoiler bars but had no room for extra dryer cans. The mill undertook a rebuild to increase felt tension, thus allowing a subsequent machine speedup.
-
Valmet Dryer Fabric Cleaner improves fabric lifetime
Valmet Dryer Fabric Cleaner enables continuous fabric cleaning during production as well as intermittent cleaning. This increases production volume, with fewer breaks, wet streaks and marking or holes on the sheet. The dryer fabric lifetime is longer, with optimal fabric permeability and resulting cost savings.
-
Field Report - Press diaphragm causes work stoppage, a case study
A chronic press load/unload diaphragm rupturing problem crippled the operation of the press at a mill. Plate and diaphragm misalignment were only part of the problem. Further analysis pointed to nipping roll diameter changes and incorrect diaphragm specifications.