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Hydraulic safety, general practice reminders and troubleshooting
Excessive heat and noise are prime indicators of fluid system malfunction on fiber, paper, board and tissue machine lines. But before jumping in to fix a fluids problem - there are several safety factors to consider before and during maintenance. In this article we list these, as well as basic troubleshooting tips for fluids.
Insights ● Article
Follow maintenance safety precautions while in the dryer section
Since dryer sections require use of high temperatures and pressures, they must be treated with caution. The nature of the dryers’ function and required operating care make it important that they be given close attention in the mill safety program.
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Field Report - Reel safety (maintenance)
Maintenance personnel should be thoroughly familiar with the OEM equipment manual before performing any maintenance procedures on the reel. When performing any maintenance on the reel, the following safety guidelines should be followed:
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Table of ream sizes for common paper, board and tissue grades
This table lists ream sizes by paper grade including lbs/ream to grams/square meter conversion factors.
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Reviewing Yankee dryer condition and performance with inspections
The Yankee dryer is one of the most essential parts of the tissue machine. This pressure vessel serves as a base for creping, pressing and drying of the paper sheet. Condition and performance of the Yankee should be monitored regularly.
Insights ● Article
Suction roll bearing failure - monitoring and lubrication 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.
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Improved rope runs with minimum changes, two-machine case study
In this case study, two paper machines were rebuilt to improve their rope runs. The rope systems were made much more reliable by making a minimum of changes. Valmet changed the transfer philosophy from tear-off to tail-release. The results were less fouling of return runs and less debris.
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LWC machine forming fabric MD ridging problem, a case study
Distortions in fabrics, such as ridges, cause basis weight profile problems. In this case study, the culprit was found to be a tiny speck of rust - which created a large and expensive problem.
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Suction couch and press roll packing strip problems, a case study
A paperboard mill suffered from unexplained grooving and chipping in thesuction roll sealing strips. The fog shower was identified as a culprit.
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Uhle boxes - care, handling, cleaning, maintenance and adjustment
Reliable operation of a press section uhle box requires attention to care and handling, as well as routine maintenance. Blades and covers are susceptible to costly damage if improperly handled and maintained.
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