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Valmet's seasonal donation supports children around the world

In the spirit of the holiday season, Valmet continues the tradition to support selected global humanitarian and conservation organizations.

Instructions for safe removal of calender stack rolls and drives

Machine calender rolls are typically removed using a house crane and slings. This article presents typical stack roll removal instructions and safety. Always refer to original equipment supplier documentation and mill procedures for the actual procedures.

Two front splicing methods and safety precautions with each

Two efficient winder front splicing methods are presented. Front splicing is more dangerous than rear splicing, i.e. nip hazards. One person should supervise.

Safety when lifting, operating and servicing felt rolls

When lifting, operating and servicing the rolls, obey the OEM and mill safety instructions regarding lifting points, nips, lifting instruments and guards in order to maximize occupational safety.

Excellent results with suction box showering, rebuild case study

A newsprint mill in southern USA was losing suction in one of their suction couch rolls. A Valmet rebuild resulted in two years of run time with very little internal pulp buildup or seal strip wear.

Off-machine coater splicing is affected by several parameters

Splicing efficiency on coaters averages about 98%. Variables that affect the splicing process include primary roll speed match, paster roll speed match, paster roll gap, paster roll pressure, paper caliper/hardness profiles, splice tape pattern and tail length.

Understanding coater blade angle vs. loading tube pressure

For a given blade tip bevel, when load tube pressure is increased, the blade angle will decrease, resulting in the blade running on its heel for a while. This, along with the additional bending pressure at the blade tip, will reduce coat weight. It is important to understand the interaction between blade angle, blade tip angle and loading tube pressure.

Indah Kiat Perawang 50% time savings in doctoring, case study

When IKPP Perawang wanted to boost machine runnability and performance, they challenged Valmet's specialists to find potential areas for improvement.

Common fluids valves explained: Pressure reducing valve

Pressure reducing valves are used to create and hold a pressure setpoint in a downstream hydraulic branch. Valmet uses sandwich style valves because they are easy to fit in a stacked hydraulic valve block circuit.

Measuring applied and residual coat weight on applicator rolls

Starch and coating is applied to the applicator roll using a rotating rod. The amount of coating applied to the roll is the most important variable for good coat weight control. This article describes a method of measuring the wet film on the fly across the size press, using a simple measurement tool.