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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.

Maximize your training results with flexible training tools

Why do companies with similar technologies achieve different results? Why do people doing the same task perform differently? The difference often lies in knowledge and skills, both of which can be acquired through learning.

Reel primary arm synchronization avoids bottom jumbo reel losses

If you suspect that you are losing excessive paper on the bottoms of your jumbo rolls, the primary arms may be the culprit. Primary arm synchronization is critical for the reel to function properly during turn-up situations.

Increasing felt tension overcomes dryer limitation, 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.

The function and proper setup of size press sealing blades

Properly functioning sealing blades in a metered size press prevent air from entering the application chamber while lubricating the blade tip/applicator roll interface. Periodic checks of the blade setup are essential for a long and trouble-free blade lifetime.

These basic guidelines help optimize suction roll performance

To optimize the efficiency of and ensure the best return on a suction roll investment, mill maintenance departments should follow some basic guidelines.

Measuring fourdrinier table stock activity helps formation

On fourdrinier forming sections, stock activity on the table is necessary to improve sheet formation and drainage rate. Too much or too little turbulence causes poor formation. Forming table activity can be observed with the use of a high frequency strobe light.

Blade doctors - purpose, design, operation, examples and options

Doctors are used to scrape foreign material off rolls or to redirect the web to prevent wrapping around rolls. Doctor components vary, but all blade type doctors will have blade(s), blade holder(s) and beam. Heaters, oscillators, air blows and catch pans are common additional options.

Positive and negative considerations when grooving suction rolls

Grooving suction rolls is a commonly undertaken process. This article answers some of the most frequently asked questions, such as: why groove the suction press roll, how does grooving affect the cover's P&J, and are there any concerns or drawbacks with grooving a suction roll.

Avoiding roll defects at the winder - causes and solutions

Most roll structural defects are caused by poor nip or tension. These tips will help operators avoid starring, soft starts, corrugations and crepe wrinkles.