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Troubleshooting headbox corrosion, plus an analysis case study
Imperfections in a headbox's finish interfere with fiber flow through its chambers, resulting in sheet uniformity problems and a poor end product. A process and condition test can identify problems caused by corrosion, fiber orientation and machine limitations.
Insights ● Article
Sources and solutions for several common doctoring problems
One of the main causes for doctoring problems is the loading tube, which may be kinked, leaking or incorrectly pressurized. Additionally, there are a number of failure points such as pivot brackets, pivot rods, blade wear and sequencing.
Insights ● Article
Troubleshooting tips for primary and secondary reeling devices
The following are general troubleshooting tips for the primary and secondary reeling devices. Chronic problems and their symptoms are described, as well as probable causes and corrections.
Insights ● Article
Reading fluids circuit diagrams - hydraulic circuit examples
The previous article in this series introduced fluids (hydraulic and pneumatic) circuit elements. This article describes three example hydraulic schematic diagrams: cylinder movement, sizer applicator beam turning and pope reel secondary arm movement.
Insights ● Article
Maintenance of reel primary and secondary reeling devices
In order to reliably build a parent roll with good structure for downstream processing, primary and secondary reeling devices must be maintained to guarantee smooth operation. Recommended maintenance and lubrication of a typical reel is presented in this article.
Insights ● Article
Apron lip mapping and repair avoid production quality problems
Apron lip damage usually comes in the form of nicks, scratches or dents. These minor abrasions can trap fibers from the pulp or cause distortions in the flow of the headbox jet, which jeopardizes sheet formation. Preparation before apron repairs can improve maintenance safety and save money.
Insights ● Article
Shoe press users group discusses the latest developments
SPUG presents Valmet's latest shoe press developments as well as providing one-on-one Valmet assistance and a venue for mill personnel to share techniques. For example, Valmet Black Belt shoe press belt and Valmet Belt Roll Doctor shoe press roll doctor are technologies that were discussed at past SPUG events.
Insights ● Article
Problematic retention aid system leads to press wreck, case study
Papermaking is as much a chemical process as it is a mechanical one. A fine paper machine lost retention aid flow when the pump shut down. The resulting imbalance caused a press wreck when the pump was restarted. Multiple lessons were learned.
Insights ● Article
Avoid common workplace injuries by using safe material handling
Most workplace injuries (almost 60%) are the result of common, everyday missteps such as overexertion and slips/trips/falls - not from violent events.
Insights ● Article
Creating an impact through technology and competence in flow control solutions and services
We talked to HangPheng Tan, our Head of Asia Pacific Market Area, recently on the company, its presence in Asia Pacific and the impact it has in the Asia Pacific market area. As of April 2022, Neles is now Valmet Flow Control business line
Insights ● Article
