Paper Industry
Technical Association

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Equipment Description:Press Section Monitoring To print this FactSheet click here To return to the FactSheet home page click here

Equipment Description:
Press Section Monitoring
Date Added: 28 January 2008
This Fact Sheet has been viewed: 2351 times.

What is it for?...   Press Section monitoring is important to make sure the performance of the section remains consistent. Factors that need monitoring include Vibration analysis, Moisture content of the felt and sheet, Permeability of the felt and the Guiding of the felt.

Related Terminology...   Press Fabrics: These are the press felts used to carry the sheet through the presses. Nip Pressure: This is the loading between two rolls. Edge Guides: These units control the run of the felt. ShoePress: This is an extended nip press. Draw: This is the tension between each section of the paper machine. Roll Hardness: Press rolls can have different hardness covers.

Diagram...   Typical Felt Life Graph

Technical Information..   During its lifetime a felt loses some permeability, hence the drop in performance of the suction box dewatering, but the void volume inside the felt means that the nip dewatering increases slightly as the felt carries more water. The permeability of a felt gives a good indication as to its condition. The characteristics can be monitored on the run using something like a Scanpro unit which is held against the felt. Vibration analysis is important on high speed modern machines. This can give early warnings about press roll covers being damaged or coming loose, also bearing failure can be a major problem necessitating a machine shut down; Moisture content is a critical factor when monitoring Press section effectiveness. Inline moisture meters traverse the web giving a moisture profile. The profile is important as it can identify possible wet streaks in the sheet which can be caused by blocked cleaning jets allowing the felt to blind up with fines, for example.

What else should I look at?... Press Section Monitoring was also mentioned in the following Fact Sheets (44): Press Section Monitoring :: Pressing Types & Arrangements :: An Introduction to Monitoring :: Sheet Transfer :: Pressing Theories :: Press Fabrics :: Drainage Aids :: Press Rolls :: Size Feed & Recirculation Systems :: Steam & Condensate Systems :: Plain Press :: Size Pressing :: Metering Application Systems :: Size Press Supply Kitchens :: Horizontal & Angled Size Presses :: Fabrics For Cylinder Drying :: Metered Size Press (or Film Press) :: Control :: Methods of Drying :: Optical Brightening Agents :: Size Press :: Pumps :: Dryer Section Fabrics :: Scanners :: Broke Pulper :: Cylinders :: Rod or Bar Coater :: Dewatering on the Forming Table :: Lubrication :: Reeler :: Heat Transfer :: Sizing :: Blade Coater :: Hydraulic Headboxes/Formers :: Formulations :: Retention/Dewatering Aids :: Woodyard :: Winding :: Cleaning Showers / Suction Boxes :: Supercalender :: Starch :: Recycling for De-Inked Pulp :: Air Knife Coater :: Base Sheet ::

Suppliers of content relevant to Press Section Monitoring These 0 companies are suppliers of relevant equipment/services. (This information is from suppliers listed in the Industry Directory. Contact PITA to have your company listed here) There are 6 other potential suppliers of relevant equipment/services. (This information is from suppliers listed in the Industry Directory Contact PITA to have your company listed here) Albany International Ltd :: Lancashire :: United Kingdom Perceptive Engineering Ltd :: Cheshire :: United Kingdom Invista :: Hants :: United Kingdom Tamfelt Corp. :: :: Finland The Alarming Man :: :: United Kingdom BTG :: Middlesex :: United Kingdom