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Gap Former Paper Machine & Stock Preparation Area | .

Press felt cleaners; Press roll release aids; ... 4 - Dryer Section. The pulp slurry used to produce paper enters the paper machine as a blend of 99% water and 1% fiber. While gravity, vacuums and the press section help to remove about 50% of the water from the sheet, the dryer section uses heated cylinders to reduce the water content to ...

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Felt Tensioning and Guiding - Convergence Training Video

A typical felt guiding system consists of a guide roll with an autoguide assembly on one end and a compressed air supply If the felt moves toward the front or back of the machine, the movement of the guide palm opens or closes the bleed air valve

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Pulp and Paper Overview - American Roller Company

Corrosion from Felt Cleaners – Caustic Boil Outs Corrosion from chemicals added to process Corrosion from wet process environment. Slippage On The Dry end: Winding Issues. Slippage on start up scratches the paper and contributes to loose core wrap. Slippage causes telescoping of parent roll. Slippage causing loose wrap of parent roll ...

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Felt Tensioning and Guiding - Convergence Training Video

A typical felt guiding system consists of a guide roll with an autoguide assembly on one end and a compressed air supply If the felt moves toward the front or back of the machine, the movement of the guide palm opens or closes the bleed air valve

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Dryers - Paper machine & component

paper machine dryer roll - valmet dryer face: 374" - (9500mm) dryer dia: 70" - (1800mm) max operating pressure 72 psi (5bar) complete section, 50 dryers including 14 vacrolls dryer (slalom run) face overall length: 383" - (9745mm) shell width : 374" - (9500mm) rope neck: 6" (155mm) breaker stack after cylinder 45 valmet sym-s roll bottom top ...

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Felt stretcher in a paper-making machine - Voith Sulzer ...

3/30/1999· A drying felt traveling in a dryer section of a paper-making machine can contract or shrink due to the heat that the felt is exposed to within the dryer section, and can expand upon absorption of water from the paper web. ... A felt is carried by the roll. The paper making machine also includes a pair of parallel lower elongated racks extending ...

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Paper Machine - an overview | ScienceDirect Topics

The dryer section of the paper machine dries the paper by way of a series of internally steam-heated cylinders that evaporate the moisture. The dryer section of a paper machine removes between 1.1 and 1.3 kg of water per kg of paper compared with 200 and 2.6 kg in the forming and press sections, respectively. It is significantly more expensive ...

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Paper Machine Dryer and Felt Roll Corrosion, 2010 .

The author describes the metallurgical nature of this corrosion damage, methods used to combat the corrosion problem, and the challenges in refurbishing roll surfaces. Author: Max Moskal Paper Machine Dryer and Felt Roll Corrosion, 2010 TAPPI PEER

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3 Pressing - AstenJohnson

meaning; "felt" is a type of fabric which is made of individual fibers only, i.e., no yarn in the fabric structure. Nevertheless, the terms "press fabric" and "press felt" are used interchangeably in papermaking. Although it depends on sheet grade and paper machine, typical sheet consistency at the beginning of the press

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Fundamentals of Paper Drying Theory and Application from ...

55%, depending on the paper grade and press se ction design. The third part of the paper machine is called the drying or dryer section. The paper web passes over rotating, heated cast iron cylinders and the most of the remaining water is removed by evaporation. When the paper leaves the dryer section its solid content has increased to about 90-95%.

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Papermaking PAPERMACHINE – PRESSING 1. INTRODUCTION

Pressing of the web on the paper machine follows ... - Quick felt, fabric and roll changes must be possible. ... Removal of water in the dryer section through evaporation is 7-10 times costlier than on presses and 60-70 times costlier than the wire part, though

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What is doctoring in Papermaking? - Pulp and Paper ...

At wet end of paper machine (Wire + press), the water removed from the sheet, stick to the roll. If this water is not scrapped, it will go back to the wire, felt and/or wet web. Doctoring System: The doctor blade is held in a holder which in turn is mounted to a cross machine beam type structure called doctor back.

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EXPETP - AstenJohnson

of machine components, poor guide roll set up, issues with guide assembly, or the forming fabric design itself. The guide roll on a paper machine has the task of keeping the forming fabric running straight. One end of the guide roll (usually the tending side) can be moved in the running direction of the machine. When the roll pivots in one ...

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GUIDELINES FOR Cleaning and Conditioning Paper Machine ...

found effect on the runnability of the felt and the press section of the paper machine. The first step in an effective felt conditioning program is an in-depth analysis of the felt contaminants present. Based upon this analysis, an optimum felt conditioning program involving both a mechanical and a chemical approach can be developed. Mechanical ...

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Tensioning devices and guides | Voith

SensoTension LC measures the exact tension of clothing in the wire, press and dryer section. Control signals are present to directly guide the tensioning device and therefore ensure constant belt tension. Unlike conventional belt force sensors, SensoTension LC is dual-channel in its design and thus ensures a constant tension for your paper machine.

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(PDF) The impact of press felt design on paper machine ...

The impact of press felt design on paper machine press dewatering ... ric after the couch roll in paper forming ... of water before the dryer section on a paper machine happen very rapidly within ...

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Fundamentals of Paper Drying Theory and Application from ...

55%, depending on the paper grade and press se ction design. The third part of the paper machine is called the drying or dryer section. The paper web passes over rotating, heated cast iron cylinders and the most of the remaining water is removed by evaporation. When the paper leaves the dryer section its solid content has increased to about 90-95%.

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Paper Machine Failure Investigation: Inspection ...

In April 1989, four dryer cans in a vintage paper machine manufactured about 1914 by Pusey Jones Corporation failed. The investigation of the accident determined that the root cause of the failure was a torsional fatigue crack that initiated on the OD surface of one of the cans.

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DRIVES G. Kaspari, C. Hölt ervennhoff* 'Silent Driv e'!

In 1989 the technical paper "silent dryer drive concept for paper ma-chines" was published in the USA by Joseph G. Miller, Product Man-ager Drives of the Beloit Corporation. A ccor ding to the American defi-nition the term is split into two different processes: 'silent felt roll drive' and 'silent dryer drive'.

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Effective Paper Machine Slime Control and No Vapor Phase ...

• Corrosion in dryer section (dryer can surface, dryer section ventilation, dryer felt carrying rolls, etc.) PaperCon 2011 10 PaperCon 2011 Page 2293. ... have on corrosion couponshave on corrosion coupons • Paper Machine testing for the components in the condensed vapor from the first section of drying PaperCon 2011 11

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Paper Machine Corrosion

– Bronze suction roll alloys have exhibited erosion corrosion, primarily due to improper end deckle adjustment Forms of Corrosion ... Dryer 75 to 250°F High humidity Deposits paper dust Coater / Size Press 75 to 250°F ... Effect of Felt Wash Chemicals Paper Machine Sample Conductivity microsiemens pH Chloride ion mg/L Thiosulfate ion Mg/L

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Paper Machine Design and Operation--Descriptions and ...

"Paper Machine Design and Operation--Descriptions and Explanations" By Gunnar Gavelin Seamed Press Felts 139 Felt Suction Boxes 140 High-Pressure Showering 140 Cost of Paper Machine Clothing 140 5.18 Vacuum Pumps 140 Water-Ring Vacuum Pump 140 Water-Ring Pump Heat Recovery 141 Turbo Compressor 142 5.19 Pressi ng and Paper Quality 143 Shadow ...

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Corrosion Fatigue and Subsequent Rupture of a Yankee .

A steam-pressurized Yankee dryer shell ruptured during normal operation. Cracking had occurred around much of the circumference at the drive end of the shell, which measured 3.7 m (12 ft) in diameter by 3.4 m (11 ft) long with a head bolted to each end. The crack initiated at a 90 deg corner in contact with the edge of the head.

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caa paper machine drying section and

Guide roll apparatus for a dryer of a paper machine drying ... A guide roll apparatus is disclosed for guiding a contiguous web and web-supporting felt through a drying section of a paper machine. The apparatus includes a rotatable guide roll having an outer cylindrical surface defining a first and a second edge portion and a central portion ...

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Cylinder Mould Type Tube Paper Machine

Main paper machine is divided into the following parts: cylinder mould part,return back press size part, press part, drying part, reeling part. Cylinder mould part: the cylinder mould part is equipped with seven cylinders, main components: each cylinder is with a wire tank, a piece couch roll, a vacuum dehydration box,and guide roll, frame, etc ...

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Effective Paper Machine Slime Control and No Vapor Phase ...

• Corrosion in dryer section (dryer can surface, dryer section ventilation, dryer felt carrying rolls, etc.) PaperCon 2011 10 PaperCon 2011 Page 2293. ... have on corrosion couponshave on corrosion coupons • Paper Machine testing for the components in the condensed vapor from the first section of drying PaperCon 2011 11

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3 Pressing - AstenJohnson

meaning; "felt" is a type of fabric which is made of individual fibers only, i.e., no yarn in the fabric structure. Nevertheless, the terms "press fabric" and "press felt" are used interchangeably in papermaking. Although it depends on sheet grade and paper machine, typical sheet consistency at the beginning of the press

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Paper machine - Wikipedia

A paper machine (or paper-making machine) is an industrial machine which is used in the pulp and paper industry to create paper in large quantities at high speed. Modern paper-making machines are based on the principles of the Fourdrinier Machine, which uses a moving woven mesh to create a continuous paper web by filtering out the fibres held in a paper stock and producing a continuously ...

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Paper Machine Design and Operation--Descriptions and ...

"Paper Machine Design and Operation--Descriptions and Explanations" By Gunnar Gavelin Seamed Press Felts 139 Felt Suction Boxes 140 High-Pressure Showering 140 Cost of Paper Machine Clothing 140 5.18 Vacuum Pumps 140 Water-Ring Vacuum Pump 140 Water-Ring Pump Heat Recovery 141 Turbo Compressor 142 5.19 Pressi ng and Paper Quality 143 Shadow ...

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Felt stretcher in a paper-making machine - Voith Sulzer ...

3/30/1999· A drying felt traveling in a dryer section of a paper-making machine can contract or shrink due to the heat that the felt is exposed to within the dryer section, and can expand upon absorption of water from the paper web. ... A felt is carried by the roll. The paper making machine also includes a pair of parallel lower elongated racks extending ...

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Published April 10, 2010 Draw Management

Vacuum roll modifications: Converting single-felted dryer groups into a vacuum roll concept improves runnability through high, adjustable vacuum levels and decreases web elongation due to larger roll diameters. Dryer section modifications: Changing group length and drive arrangement, and coating dryer .

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Guide roll apparatus for a dryer of a paper machine .

A guide roll apparatus is disclosed for guiding a contiguous web and web-supporting felt through a drying section of a paper machine. The apparatus includes a rotatable guide roll having an outer cylindrical surface defining a first and a second edge portion and a central portion disposed between the .

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