Experimental and Theoretical Studies of Plane Liquid Jets ...
suspension to the paper machine. It is believed that the homogeneity of the jet °ow is of vital importance to obtain a good quality paper. The present investiga-tion has been undertaken in order to better understand the development of free, plane liquid jets. Both the development of the basic laminar °ow as well as its stability have been ...
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Carbon utilization profiles of bacteria colonizing the ...
Jan 10, 2009· Forty-one bacterial strains isolated from the headbox water of two machines in a Canadian paper mill were associated with the genera Asticcacaulis, Acidovorax, Bacillus, Exiguobacterium, Hydrogenophaga, Pseudomonas, Pseudoxanthomonas, Staphylococcus, Stenotrophomonas based on the sequence of their 16S rRNA genes. The metabolic profile of these strains were determined using .
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«Optimisation of Broke Recirculation in a Newsprint Mill»
analysis and improvement tools. Optimization schemes work by minimizing an objective ... the stability of the paper machine is affected, as sudden changes to the broke ratio cause fluctuations in the properties of the pulp at the paper machine headbox. The objective of this study is to develop a dynamic simulation of the process in order to
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Modern papermaking feb 2018 pdf - SlideShare
2/12/2018· Pele Oy Wet end rebuild of testliner machine. This Valmet example is interesting how to get four layers of conventional two-layer testliner machine by using layering headbox. 126 127. Pele Oy 127 Multigrade cartonboard machine There are five headboxes and .
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TRANSIENT STABILITY ANALYSIS USING EQUAL AREA .
3. control strategies applied in transient stabiliy analysis 3.1 introduction 14 3.1.1 theory behind equal area criteria 15 3.1.2 robust equal area criteria 20 3.2 transient stability analysis 23 a computing challenge 3.3 automatic generation control 24 strategies in power systems
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Microbes in the Papermachine Environment
C Paper Machines 122 o F50 o C Starch Vats 140 o F60 o C Thermophiles 158oF70oC Board machines 176 o F80 o C o o HtS i PaperCon 2011 Page 2316. ... Machine surfaces • Headbox ... •Deposit analysis-Microbiological analysis of deposits
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Expermental and mathematical modeling of flow in .
The fluid flow patterns in a paper-machine headbox have a strong influence on the quality of the paper produced by the machine. Due to increasing demand for high quality paper there is a need to investigate the details of the fluid flow in the paper machine headbox. The objective of this thesis is to use experimental and computational methods of modeling the flow inside a typical headbox in ...
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SENSITIVITY ANALYSIS BY ARTIFICIAL NEURAL NETWORK .
that govern the operation of the head box, fiber orientation resulting from sheet formation and stability of the paper after formation (NISKANEN; KAJANTO, 1998). Figure 1 illustrates the paper deformation by distinguishing twist and curl. FIGURE 1: Out of plane deviation (LEVLIN et al., 1999). FIGURA 1: Desvio fora do plano (LEVLIN et al., 1999).
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The Pulp and Paper Making Processes
the ''wet end* of the paper-forming machine. In the paper making process, the dilute stock passes through a headbox that distributes the fiber slurry uniformly over the width of the paper sheet to be formed. The "web" of fiber that will make the new paper sheet is formed on a continuously moving
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Transient stability analysis of multi-machine power system ...
Jan 11, 2014· This paper deals with the stability analysis of a multi-machine power system using energy functions of individual machine and group of machines. The simulations carried out reaffirm the concept of critical machines in stability analysis. The use of energy functions to determine the Critical clearing time (of fault), an important parameter in ...
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Analysis of Sheet Variations – Insights of Two-Dimensional ...
for many decades, it gives no clear insights about the characteristics of each component. This paper is intended to illustrate how to use power spectral analysis (PSA) and principal component analysis (PCA) to extract detectable patterns from a 2D sheet measurement. The extracted patterns can be associated to potential root causes in sheet-
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Experimental and Theoretical Studies of Plane Liquid Jets ...
suspension to the paper machine. It is believed that the homogeneity of the jet °ow is of vital importance to obtain a good quality paper. The present investiga-tion has been undertaken in order to better understand the development of free, plane liquid jets. Both the development of the basic laminar °ow as well as its stability have been ...
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US5645689A - Multilayer headbox - Google Patents
A multilayer headbox for the introduction of at least two fiber suspension streams to the forming section of a paper manufacturing machine includes a nozzle chamber further defined by two stream guide walls which end at an outlet gap and by two side walls. At least one lamella is provided in the nozzle chamber, this lamella keeping at least two fiber suspension streams separated from each ...
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1 Dynamic Modeling, Stability, and Control of Power ...
1 Dynamic Modeling, Stability, and Control of Power Systems with Distributed Energy Resources Tomonori Sadamoto1, Aranya Chakrabortty2, Takayuki Ishizaki1, Jun-ichi Imura1 Abstract This article presents a suite of new control designs for next-generation electric smart grids.
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SENSITIVITY ANALYSIS BY ARTIFICIAL NEURAL NETWORK (ANN) .
One result of this tension release is the diagonal curl. This study aims to conduct a sensitivity analysis of the different input's variables of an industrial paper machine, along with some laboratory measurements, in order to identify the importance in production of paperboard quality control and relate to the property of the paper called twist.
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Various Tuning Methods for the Control of pH in Head box ...
V. PERFORMANCE ANALYSIS Table 2 shows the comparison of performance indices for different tuning methods. It can be seen that when Ziegler-Nichols tuning method is used to control pH in the headbox of paper machine, P type of controller has lesser rise time and settling time than that of PI and PID type of controller. PI controller has very large
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Probabilistic Matrix Factorization
by linearly combining item factor vectors using user-specific coefficients. For example, for N users and M movies, the N×M preferencematrix R is given by the product of an N×D user coefficient matrix UT and a D × M factor matrix V [7]. Training such a model amounts to finding the best
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Amplified ribosomal DNA restriction analysis of free ...
An amplified ribosomal DNA restriction analysis (ARDRA) was carried out to characterize the bacterial communities associated with the headbox water of a paper machine in a Canadian mill in February and July 2006. Eight bacterial genera were identified as the main colonizers present in the headbox water.
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Forecasting with PCA An Application to Financial Stability ...
PCA. The same technique will then be used in order to forecast a financial stability index built using the approach of Illing and Liu (2006). The Aggregate Financial Stability Index proposed by Morris (2010) for Jamaica will be employed. The remainder of the paper is organized as follows: Section 2 presents an overview of the literature.
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Machine Learning in Control Systems: An Overview of the ...
Dec 11, 2018· Machine learning methods (ML), on the other hand, are highly flexible and adaptable methods but are not subject to physic-based models and therefore lack mathematical analysis. This paper presents state of the art results using ML in the control system.
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estudogeral.sib.uc.pt
Keywords: Dimensional stability, hygroexpansibility, paper image analysis, reprographic paper, shrinkage ABSTRACT During the drying stage of the papermaking process, paper undergoes dimensional changes caused by fiber dehydration, but exhibiting uneven width teduction magnitudes along the cross-machine direction. The
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FIBER ORIENTATION IN A HEADBOX by Xun Zhang B. Eng ...
headbox has a significant effect on the orientation of fibers leaving the slice. The elongation and shear in the flow leading to the slice tend to orient fibers in the machine direction. If the fiber orientation can be predicted for a given set of processing conditions, manufacturing paper with optimum mechanical properties will become much easier.
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Annex 5 Guidelines for stability testing of pharmaceutical ...
drug by using exaggerated storage conditions as part of the formal stability testing programme. The data thus obtained, in addition to those derived from real-time stability studies, may be used to assess longer-term chemical effects under non-accelerated conditions and to evaluate the im pact of short-term excursions outside the
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SENSITIVITY ANALYSIS BY ARTIFICIAL NEURAL NETWORK (ANN) .
One result of this tension release is the diagonal curl. This study aims to conduct a sensitivity analysis of the different input's variables of an industrial paper machine, along with some laboratory measurements, in order to identify the importance in production of paperboard quality control and relate to the property of the paper called twist.
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Annex 5 Guidelines for stability testing of pharmaceutical ...
drug by using exaggerated storage conditions as part of the formal stability testing programme. The data thus obtained, in addition to those derived from real-time stability studies, may be used to assess longer-term chemical effects under non-accelerated conditions and to evaluate the im pact of short-term excursions outside the
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Various Tuning Methods for the Control of pH in Head box ...
V. PERFORMANCE ANALYSIS Table 2 shows the comparison of performance indices for different tuning methods. It can be seen that when Ziegler-Nichols tuning method is used to control pH in the headbox of paper machine, P type of controller has lesser rise time and settling time than that of PI and PID type of controller. PI controller has very large
Get priceFIBER ORIENTATION IN A HEADBOX by Xun Zhang B. Eng ...
headbox has a significant effect on the orientation of fibers leaving the slice. The elongation and shear in the flow leading to the slice tend to orient fibers in the machine direction. If the fiber orientation can be predicted for a given set of processing conditions, manufacturing paper with optimum mechanical properties will become much easier.
Get priceheadbox_tappi2000c | Fluid Dynamics | Turbulence | Prueba ...
Figures 4 to 6 show the velocity in the cross-machine direction, the velocity in the machine direction, and the pressure distribution in half of the headbox and for a recirculation rate of 25%. The velocity in the cross-machine direction in the manifold, Figure 4, increases as the flow proceeds toward the exit.
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Experimental equipment for simulation of press nip in ...
Keywords: Lab-test equipment, press nip, tissue machine, simulation, paper During manufacturing of tissue paper, large amounts of energy could be saved with an optimized press nip. In the press nip, water is pressed out of the paper and depending on both machine and paper parameters, the .
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CONTROL SYSTEM ENGINEERING-II (3-1-0)
response of Sampled-data closed loop Control Systems, The Z and S domain Relationship, Stability Analysis. MODULE-III (10 HOURS) Nonlinear Systems: Introduction, Common Physical Non-linearities, The Phase-plane Method: Basic Concepts, Singular Points, Stability of Nonlinear System, Construction of Phase-trajectories, The
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Using dynamic simulation and operability analysis for an ...
Using dynamic simulation and operability analysis for an improved broke management in a fine paper mill Dante Via, M.Sc. (P2004) Introduction Process variability in a highly integrated paper mill is a very complex problem and depends on at least five sources: mechanical, chemical, furnish quality, process design and control structure.
Get priceFundamentals of Papermaking
paper to a tight specification and high standard of uniformity. In the case of a machine calender stack, CD control can impart stability to an otherwise unstable system. Instability of the headbox or approach flow system can however seriously offect the MD control of basis weight. Some types of instability lie
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