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Troubleshooting rope runs - the four most common problem areas

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.

VacRoll suction holes and grooves should be cleaned regularly

VacRoll suction holes and the grooves of all rolls should be cleaned regularly, as they may get completely clogged due to web moisture, particularly at the start of the dryer section. Bearing housings also need attention. Proper handling of the rolls is also important.

Differential drive inspection - clutch, PIV, bearings and gears

The differential drive supplies power to the individual machine sections, and maintains a constant preset speed between those sections. The slightest speed difference between sections can result in a sheet break and lost production. Knowing the drive components and what to look for helps in preventive maintenance.

Yankee rebuild improves tissue quality, a case study analysis

Rebuilding a Yankee is a daunting decision, due to OSHA regulations for confined space entry and the significant cost of downtime. This mill was losing product due to poor tissue quality, and Valmet's service engineers assisted in the decision making process to rebuild the Yankee.

Never straighten bent reel spool journals - safer to replace them

Reel spools carry more load for their size than any other roll in the paper mill. Bent journals can break, causing the log to fall from the reel or storage reels onto the floor and bump into equipment and personnel.

Wet streak caused by corrosion of roll shell, case study

A wet streak leads to combined investigation by mill personnel and Valmet roll specialists. A suction roll cover is removed and analyzed, after which a metallurgist inspects the roll. The mill mechanic provides a key insight...

Securing efficiency and continuous reliability improvement for your machine

Most equipment failures are random. For high value, critical equipment this program proactively does the right work at the right time and maximizes reliability.

Flexible Service Agreement: Easy budgeting with predicable costs

Valmet now offers a fixed price volume purchase agreement to improve mill operations. Regardless of service type, maintenance costs will now be predictable.

Mill finds good housekeeping can reduce vibration, case study

PM5 was producing waves of vibration that speed limited the machine, reducing production by 10%. Vibration analysis pointed to the gearbox pinion shafts.

Inspecting dryer cans - guide and recommended procedures

This article covers recommended types of dryer inspection and frequency. An inspection program is necessary to detect early signs of dryer component failure.