Search results

A lazy W profile after the supercalender causes sheet problems

The lazy "W" roll profile at the calender windup can cause wrinkles, corrugations and baggy lanes. Thermal banding may be the culprit.

Start-up checklists help operators avoid missing machine settings

Start-up checklists help new and seasoned machine operators through the start-up process without missing any machine settings. They are also good for training purposes.

Valmet receives Silver Class Sustainability Award 2018 in RobecoSAM’s annual Sustainability Yearbook

Valmet has received a Silver Class medal in RobecoSAM's annual Sustainability Yearbook 2018 for its excellent sustainability performance. RobecoSAM is an investment specialist focused exclusively on Sustainability Investing. The Yearbook showcases the sustainability performance of the world’s largest companies and includes the top 15% per industry.

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.

Optimizing continuous digester performance (webinar)

Many continuous digesters are operating over design, making the system too sensitive to process disturbances. A Valmet webinar reviewed issues and solutions.

Avoid the wrinkles and web breaks that result from poor splicing

Splicing offers little reward for a job well done, but big penalties to the bottom line for poor quality workmanship such as when customers return shipments.

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.

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.

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.

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.