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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.

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.

Measuring fourdrinier table stock activity helps formation

On fourdrinier forming sections, stock activity on the table is necessary to improve sheet formation and drainage rate. Too much or too little turbulence causes poor formation. Forming table activity can be observed with the use of a high frequency strobe light.

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.

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.

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.

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.

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.

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.

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.