The most significant variable is the "rush/drag" relationship between headbox jet velocity and wire speed. Fiber orientation profiles become worse as rush or drag approaches zero. There is an …
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ITP Forest Products: Improving Paper Machine Efficiency through On-Line Controm of Stock Delivery, Headbox, and Forming Hydrodynamics Author: Cyrus Aidun Subject: Replace …
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machine and cross-machine directions. Fiber orientation can be controlled by headbox rush/drag adjustment; although, formation will be best at lower MD/CD tensile ratio. The overall level of sheet strength properties (geometric mean) attained will be influenced by fiber properties and degree of refining and pressing.
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How to drastically reduce the time needed to undertake rush/drag trials. How confidence in rush-drag settings can be increased using a continuous measurement; How sensitive different paper properties are to changes in md/cd ratio. The typical variation in md/cd ratio experienced by commercial paper machines.
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This paper attempts to predict paper properties on a running paper machine so that papermakers can see the test values predicted in real time while changing various process parameters.
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characterize the effects of rush and drag on fibre tilt (3). Although paper is a highly stratified material, hydrodynamic forces in the forming process of a Fourdrinier machine are likely to cause one end of an MD-ori ented fibre to migrate a greater distance toward the wire side. Paper made under drag conditions is likely to have fibres
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The first concern in the project was to build a dynamic model of the paper machine wet end to describe the distribution of fines, fillers and fibers throughout the wet end system.
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Paper Machine Evaluation by Polar Angle Profile Analysis Irwin M. Hutten Institute of Paper Science and Technology ABSTRACT Polar angles, as determined by the velocity of sound …
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This technology results in significant improvements in the performance and capital effectiveness of the paper machine (PM) for a fraction of the cost to replace a headbox. In this project we have developed and demonstrated the concept of generating axial vorticity to control the fiber orientation in the converging zone of the headbox, and to ...
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This can be caused by improper alignment of the primary arms to the reel drum, spool nip load profile issues, or a web that wants to tear easily in the machine direction (MD/CD tensile ratios too high). This phenomenon can be caused by too high of rush-drag, high fiber orientation, or headbox edge flow/header balance issues.
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In Paper Making we also talk about Drag and Rush. This is the Ratio between the Jet Speed and the Wire Speed. Drag = Jet Speed lower then Wire Speed. Rush = Jet Speed …
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Has 15-20 good performance guidelines for linerboard, corrugating medium, fine paper, newsprint, Kraft paper, bleached board, and recycled paperboard. Explains the guidelines and …
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correlated with paper machine process parameters like refining energy, rush/drag, chemical additions, etc., to pre - dict the sheet properties. However, these soft sensors are expensive and need dedicated manpower to maintain and calibrate them [6]. The objective of this paper is to predict sheet strength
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This paper attempts to predict paper properties on a running paper machine so that papermakers can see the test values predicted in real time while changing various process parameters.
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Almost all paper is produced continuously. There are various types of paper machines which perform this operation. The Fourdrinier paper machine is one of the most commonly used paper machines (McGill, 1980). Figure 1.1 shows a basic Fourdrinier machine, which has been greatly simplified. The forming part consists of an endless belt of open ...
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Improving Paper Machine Efficiency Through On-Line Control of Stock Delivery, Headbox and Forming Hydrodynamics -- DE–FC36–99GO10416 Cyrus K. Aidun ... Tensile MD-CD Ratio vs Drag & Rush -20 -10 10 20 30 40 Tensile MD-CD ratio [-] trial 01: SD standard tr 03: V1, sheets:
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MG paper, paper machine, process control, strength properties INTRODUCTION Paper properties, which are mainly the ... from drag -7 m/min to rush +3 m/min, shown as a grey region, TSO was between ± 1.7° and curl – from 2.0 to 2.5 m-1. Beyond this range, the curl and TSO of
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technology, high speed paper machines have been developed for the manufacturing of high quality paper. The quality ... Rush/Drag is the ratio of the speed of the stock out of the orifice of the headbox at the bottom and speed of the wire (i.e. Fourdrinier machine). It is also known as jet to wire ratio and has a significant influence on
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In the paper industry, the term rush-drag is used to refer to the difference between slice velocity and wire speed. If the slice velocity is in excess of the wire speed, it is said that the stock is …
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PAPER MACHINE WET END by EDDY FEI PANG YAP B.A.Sc, The University of British Columbia 1995 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF ... 3.4.5 Rush-Drag Ratio Control 61 3.4.6 Brightness modeling 65 3.5 CONCLUSIONS 68 Chapter 4 MODEL VALIDATION 70 4.1 INTRODUCTION 70 v .
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This paper presents a model-based fault detection and fault-tolerant control technique for the pressurized headbox of a paper machine. A bank of Kalman filters is constructed corresponding to all the possible sensor failure modes. ... To maintain a constant rush/drag ratio, the total head must be adjusted with the variation of wire speed ...
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The fan pump propels the dilute slurry of papermaking furnish towards the headbox of a paper machine. The pumps are designed in such a way as to minimize pulsation, since the goal is to keep the basis weight constant over time and avoid "barring".
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from drag -7 m/min to rush +3 m/min, shown as a grey region, TSO was between . ± 1.7° and curl – from 2.0 to 2.5 m-1. ... (MD) and cross-machine drection (CD) of paper sheets. The results ...
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