Up and Running articles
Up and Running articles
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Field Report - Extended Nip Press performance
Since 1980 the Extended Nip Press (ENP) has performed well. But there have been improvements since its initial entry in the market. These include prolonging the blanket/belt and felt life and improving sheet properties with oil lubrication showers, belt brushes, belt wipes, loading piston upgrades and geometry optimizations.
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Field Report - Protecting soft roll covers
Soft rolls represent a significant investment for mills, yet they are susceptible to damage, especially if the surface temperature varies too much across the face of the roll. This article describes the design, operation and maintenance of some of the most common soft roll protection devices.
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Field Report - Steam shower tips and Valmet IQ Steam Profiler
Guidelines for steam shower setup, usage and shutdown as well as precautions are presented in this article, as well as the results that are possible with the Valmet IQ Steam Profiler.
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Field Report - Reel spool safety
Reel spools carry more load for their size than any other roll in the paper mill. Bent journals can break, causing the log to fall from the reel or storage reels onto the floor and bump into equipment and personnel.
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Field Report - 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.
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Case Studies - Valmet polarized forming fabrics
Customer experiences have shown that Valmet's polarized forming fabrics have the potential to revolutionize water removal in the papermaking process. Two board machine case studies illustrate the savings that are possible.
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Field Report - Slitter blade and band sharpening
Slitters must be sharp and properly sharpened. The best way to maintain a continual supply of sharp slitter blades is to use the Valmet BladePool service. If, however, you choose to do your own sharpening, here are some general instructions for sharpening at the mill.
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Field Report - Spreader roll problems, solutions and services
Spreaders deal with web instability, using the principles of tension and traction to overcome dishing and interweaving. Valmet spreader roll services ensure spreading efficiency with all-round cost control.
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Field Report - Felt roll safety
When lifting, operating and servicing the rolls, obey the OEM and mill safety instructions regarding lifting points, nips, lifting instruments and guards in order to maximize occupational safety.
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Field Report - Blade-type doctors, design and operation
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.