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SAFETY BULLETIN: Precautions to take before refiner maintenance

Valmet has learned of a catastrophic failure of a Valmet Disk Refiner. Excess pressure was used trying to unplug an inlet pipe. No injuries, but much damage.

Improving reel turnups for low downtime and high paper yield

The reel turnup process must be perfect in order to maintain high quality end product and avoid downtime. Successful turnups share key aspects, while others may benefit from a technology upgrade.

SymSizer/OptiSizer beam setup, after applicator roll change

SymSizer or OptiSizer beam setup is required after every applicator roll change or whenever you feel there is an issue with starch/coating application. The goal is to set the applicator beam parallel with the new applicator roll.

Ten step procedure for patch repair of rubber roll covers

The trick is don’t rush the job; take your time and keep the patch area clean. You’ll need a Dremel, heating platen and uncured, un-vulcanized rubber stock.

Instructions for safely taking and using calender nip impressions

Nip impressions are usually taken at installation or to investigate causes for poor paper quality. Taking nip impressions is dangerous if not performed correctly, and should only be done by trained personnel.

Measuring wound-in tension - WIT-WOT and gap test methods

Among the most important factors determining the quality of a finished paper roll is consistent roll structure. Wound-in tension is the most important component of roll structure. The WIT-WOT and Gap Test are methods of measuring wound-in tension.

Headbox apron shower troubleshooting variables, and a case study

The key word in papermaking is uniformity, and the apron shower plays a primary role in maintaining this characteristic. Shower water volume, pressure and temperature are critical factors. The case study involves the three indicators of a thermal bow problem in the apron lip.

Valmet Batch Cooking

Valmet Batch Cooking is the right choice for dissolving pulp grades. A system with high availability and capabilities for various dissolving grades. Valmet’s batch cooking system is also a viable option for wood based kraft mills designed for smaller capacities.

Chemical pulping

We offer tailored technology solutions for softwood and hardwood kraft pulp production.

Cooking

With state-of-the art technology Valmet serves pulp mills world-wide. Our cooking systems give higher pulp yield, lower reject and less environmental impact. The end result is improved products, productivity and profitability.