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US5673495A - Single-tier drying section with top-felted ...

A drying section of a papermaking machine is constituted of a plurality of top-felted single-tier drying section which terminate with one or at most two two-tier sections which are both top-felted. The invention allows broke to fall by gravity, greatly facilitating broke removal and recycling. Moreover, the location of the double-tiers at the end of the drying sections affords opportunity for ...

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Cans And Section - 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

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Modeling, Calibration and Control of a Paper Machine Dryer ...

A paper machine dryer section model can be assembled using very few basic component types. In essence, there are only two fundamental entities, namely a steam heated cylinder and a sheet of paper. These two component types may then be combined, in large numbers, into a complete dryer section model. However, it is con-

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Papermaking - Formation of paper sheet by machines ...

The dryer section of a conventional paper machine consists of from 40 to 70 steam-heated drying cylinders. After passing around the cylinders, the sheet is held in intimate contact with the heated surfaces by means of dryer felts. Until recent years, relatively heavy, ...

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Papermaking - Formation of paper sheet by machines ...

The dryer section of a conventional paper machine consists of from 40 to 70 steam-heated drying cylinders. After passing around the cylinders, the sheet is held in intimate contact with the heated surfaces by means of dryer felts. Until recent years, relatively heavy, ...

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FRAMEWORK FOR OPTIMIZATION OF THE PAPER MACHINE .

Many paper machines today are rebuilding the dryer section and including cantilever stationary syphons as a technology to simplify the design of the steam and condensate system as well as improve efficiency of the dryer section. The constant differential pressure of 0.20 bar (3 psig) will adequately evacuate the dryer under any operating condition.

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There's New Life in the Old Dryer Section - Pulp and Paper ...

Once improved dryer section stability was achieved, it would play an important role in increasing machine speed. In early April 2004, new stationary syphons and Turbulator bars from Johnson were installed in 36 of the 47 heated dryer cans.

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

"Paper Machine Design and Operation--Descriptions and Explanations" By Gunnar Gavelin 1998., 222 pp., Published by Angus Wilde ... Press Section to Dryers 137 5.16 Economics of Pressing 137 5.17 Press Felts 138 Felt Construction 138 Performance Requirements 139 "Paper Machine Design and

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Process Parameters Optimization for Energy Saving in Paper ...

In order to improve the energy efficiency of the paper machine dryer section, deeper analysis and optimization of process parameters are necessary. A NLP optimization method is developed for integration of steam system and air system to reduce the steam consumption and decrease the loads of centrifugal blowers in the multicylinder dryer section ...

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Papermaking PAPERMACHINE – PRESSING 1. INTRODUCTION

dryness of the sheet entering the dryer section. It has a major impact on the structure and runnability of the paper and thus the operating efficiency of the machine (Wahlstrom, 1969). The dewatering capacity of a press section and the properties of paper depend on the design and the number of nips.

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Pocket ventilation system in dryer section of paper ...

Jul 07, 2015· After the dryer section 5% to 6% moisture content is present in the paper web [1]. The dryer section of paper machine has nearly 1/3rd part of investment and operating cost and it .

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Paper Machine Drying Section, Drying Section Ventilation

4. Stabilize the paper web and improve the efficiency of the paper machine: with the continuous increase of paper machine speed, maintaining the stability of the paper web in drying section of the paper has become the main task of the ventilation system, dry paper instability may cause that speed is limited, or lots of paper machines fail to work.

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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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Effect of operating parameters on the drying performance ...

The drying performance of multicylinder dryer section in a paper machine was investigated under various operating parameters: Inlet paper solid content (48–50%), inlet paper temperature (45–50°C), supply air temperature (100–90°C), and exhaust air humidity (75–85 g H 2 O/kg dry air). The variation in environmental conditions was also considered.

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Dryer Section of Paper Machine | Scientific.Net

Abstract: In paper dryer section of the paper machine, paper dehydration is small, but the steam consumption for the process of dehydration is very large, this steam consumption has a great influence to the total steam consumption of the whole papermaking process. A method optimization of the dryer section based on genetic algorithm is proposed ...

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Guide roll apparatus for a dryer of a paper machine drying ...

The guide roll apparatus generally designated 22 shown in FIGS. 3 and 4 is disposed adjacent to a dryer 12B of a paper machine drying section generally designated 24. The apparatus 22 guides a contiguous web WB and a web-supporting felt FB through the drying section 24.

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Paper Machine Components - Can-Am Machinery

Class: Paper Machine Components » Dryers » Cans And Sections Manufacturer: Escher Wyss Part Number: 41420 Size: 110" Year Manufactured: 1980 Qty: 6 Description: Escher Wyss Manchester (6) Dryer Can Section, Rated 125 Psi At 450 F, 110" Working Face, 60" Diameter, 112.5" With Rope Ring, 115" Overall Width, Enclosed Bearings, With Rope System, Doctors, Felt Guides, Felt Rolls, Oil .

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Pocket ventilation system in dryer section of paper ...

Jul 07, 2015· After the dryer section 5% to 6% moisture content is present in the paper web [1]. The dryer section of paper machine has nearly 1/3rd part of investment and operating cost and it .

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Voith rebuild of dryer section Jass Schwarza paper machine ...

Jun 11, 2019· In September 2015, Voith rebuilt the PM 1 at the Adolf Jass paper mill in Schwarza / Rudolstadt. The aim of the rebuild was to increase the maximum productio...

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Wet-end to Dry-end of the Paper Machine | by Lucas Moyer ...

https://medium/lucas-moyer/wet-end-to-dry-end...The Fourdrinier

Dryer Section Control in Paper Machines During Web .

and Deutsch, 1999G. Principles for analyzing dryer section steam and condensate systems is treated in FHill, 1993G. 2.1 The paper machine The main purpose of a paper machine is to produce paper quicklywhile also keeping a constant quality. Today, paper machines run at speeds up to 2000 m min and with 10 m wide cylinders.

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Toscotec | Products - Paper&Board machines: Drying section

In the case of a new paper machine it is possible to use fewer dryers, which clearly results ( IMMAGINE ) in a reduced investment cost and space with reduced investment in the building. As a rebuilding tool when upgrading an existing paper machine, there is significant increased drying capacity when simply replacing the cast iron dryers .

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Steam and condensate system performance - explanation and tips

Valmet has, however, found one machine that operates in the opposite way, running as much as 60 psi in the first dryer section. This is rare though as blowthrough needs to be sent to later drying sections or goes directly to a condenser, the latter of this leading to high condenser loads.

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Energy Optimization in the Dryer Section - pulp and paper ...

in the Dryer Section A t today's high cost of energy, optimizing the paper machine dryer section offers one of the greatest returns on capital. More than 75% of the electrical and steam usage by a paper machine is consumed in the drying section. Monitoring, evaluating and controlling this section of both old and new paper machines is imperative.

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Papermaking PAPERMACHINE – PRESSING 1. .

machine and has great influence on paper quality. It determines the dryness of the sheet entering the dryer section. It has a major impact on the structure and runnability of the paper and thus the operating efficiency of the machine (Wahlstrom, 1969). The dewatering capacity of a press

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US8429832B2 - Utilization of waste heat in the dryer ...

The dryer section of a paper machine consists of a steam-heated dryer and a high-temperature hood heated by steam or gas and located above the dryer. The dryer is generally operated with steam pressures between 1 and 10 bar, and the blow-air temperature of the high-temperature hood is usually between 250° C. and 700° C. ...

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Drying Section Optimization

Drying Section Optimization PM drying section optimization improves process The EV Group (EVG) is a team of specialists providing customized services and technologies to op-timize paper machine runnability, process efficiency, and paper qua-lity. EVG is specialized in solving PM operational bottlenecks and problems. They offer tailored

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Papermaking PAPERMACHINE – PRESSING 1. .

machine and has great influence on paper quality. It determines the dryness of the sheet entering the dryer section. It has a major impact on the structure and runnability of the paper and thus the operating efficiency of the machine (Wahlstrom, 1969). The dewatering capacity of a press

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Wet-end to Dry-end of the Paper Machine | by Lucas Moyer ...

May 12, 2017· This is the largest part of the paper machine and has the largest capital cost. ... of water evaporated per hour per square foot of dryer surface contacted. ... drying section, paper is pressed ...

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A Modelica Library for Paper Machine Dryer Section ...

The topic of this paper is modeling, model reduction, parameter optimization and control of a paper machine drying section. The dryer section is the last part of the paper machine and consists of a large number of rotating steam heated cast iron cylinders. The moist paper is led around these cylinders and

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Effect of operating parameters on the drying performance ...

The drying performance of multicylinder dryer section in a paper machine was investigated under various operating parameters: Inlet paper solid content (48–50%), inlet paper temperature (45–50°C), supply air temperature (100–90°C), and exhaust air humidity (75–85 g H 2 O/kg dry air). The variation in environmental conditions was also considered.

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Dryer Section of Paper Machine for Paper Making Line

Dry section of paper machine is used for removing remaining water of paper web by evaporation. By using Leizhan multi-cyclinder drying, it can ensure maximum paper web drying efficiency with minimum energy consumption.After drying, finished paper dryness can reach and over 92% depending on the grade. Components of dry section of paper machine contains: Dryer .

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