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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.

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.

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.

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.

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.

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.

Reel maintenance: on-the-run monitoring, checks and consumables

Many reel service actions and adjustments are common to all paper machine reels. This article reviews on-the-run (OTR) monitoring of the reel, as well as long-term (20 year) checks such as screw torques and critical seam weldments. Consumables must be inspected and replaced as needed, especially actuators and cylinder seals.

Hydraulic safety - 5 tips for before, during & after maintenance

Hydraulic maintenance should be performed by knowledgeable, trained technicians. Here are some tips for safely and efficiently working on hydraulic systems.

Avoid winder vibration with modern software and hardware tools

Some paper grades generate winder vibration. Modern tools help, such as 4-way hydraulic valves, stiffer drums with lower dynamic runout and automated controls.

How to troubleshoot calender roll heat transfer problems

The following were noted during installations and are common installation troubles. Read them carefully to rectify or avoid them during your installation.