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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.

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.

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.

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.

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.

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.

Five best practices for roll performance and cover life

For optimum performance and to maximize cover life, keep covers clean, monitor and avoid high cover temperatures, check crown and avoid impact damage.

Valmet Belt Roll Doctor reduces press moisture, a case study

A 1990s uncoated freesheet machine in the United States wanted to decrease their press moisture. They chose the Valmet Belt Roll Doctor to doctor the shoe press belt.

Reeling parameters - tension, nip load and peripheral force

The three critical parameters which must be controlled to make a well structured parent roll that can handle further processing are determined case-by-case.