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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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
Troubleshooting chronic wrinkling on a size press, case study
Valmet investigated an issue where a size press was having wrinkling when the nip closed and before the applicator beam was loaded. The culprit was hydraulic.
Insights ● Article
Helpful tips for size pressing: properties, load, vibration…
Sheet properties when using size include - increased internal, surface, tensile strength, stiffness and roughness; decreased porosity, opacity and whiteness.
Insights ● Article
Guide to dryer section performance, key operating parameters
Here are some notes regarding key operation parameters of the dryer section, starting with the three zones related to effective drying rate.
Insights ● Article
OptiDry Coat energy savings at Hansol Daejeon, a case study
After rebuilding two board machines with OptiDry Coat technology, Hansol Daejeon is very happy with the energy savings. The successful results with PM 31 were repeated and exceeded with PM 32, with excellent cooperation.
Insights ● Article
Valmet Breast Roll Shaker 120 enhances board and paper properties
Valmet Breast Roll Shaker 120 improves formation properties such as: sheet strength, surface smoothness, printability and furnish absorption. Its simplified design has a small footprint and it's designed for easy maintenance.
Insights ● ArticleValmet tissue machine roll covers achieve significant benefits
Valmet’s new polyurethane cover materials extend running periods and reduce maintenance and energy costs on tissue machines.
Insights ● Article
