Modern Trend in Design of High Speed Paper Machine

1956 ◽  
Vol 59 (445) ◽  
pp. 112-118
Author(s):  
Nobuyoshi KONDO
Keyword(s):  
High Speed ◽  
Modern Trend ◽  
Paper Machine

scholarly journals Brief Review and Mathematical Modelling of Air Cushioned Pressurized Paper Machine Headbox

2018 ◽  
Vol 7 (3.4) ◽  
pp. 57 ◽  
Author(s):  
Parvesh Saini ◽  
Rajesh Kumar
Keyword(s):  
Mathematical Modelling ◽  
High Speed ◽  
Paper Industry ◽  
Paper Machine ◽  
Efficient Operation ◽  
Precise Control ◽  
Paper Machines ◽  
Day By Day ◽  
Paper Machine Headbox

Today, the requirement of high grade papers is increasing day by day. To cater the need of high quality papers, new high-speed paper machines are being developed constantly. The whole economy of a pulp and paper industry depends on the quality of paper produced, quality of paper depends on the efficient operation of the major part of paper industry – paper machine. Paper machine is the heart of paper industry and has many subsystems. One of the important subsystem of paper machine is Headbox.   To have the desired quality papers, efficient working of headbox is highly required. To have desired operation from headbox, its precise control is necessary. The precise modelling of headbox, leads to design of efficient controllers for its proper control to get the desired response. This paper presents the mathematical modelling of headbox along with a brief review of various research performed on headbox.  

Study on Paper Electromagnetic Drying Rate

2013 ◽  
Vol 680 ◽  
pp. 356-359
Author(s):  
Zheng Shun Wang ◽  
Zhao Hui Zhen
Keyword(s):  
High Speed ◽  
Energy Crisis ◽  
Drying Rate ◽  
Paper Machine ◽  
Paper Drying ◽  
Developmental Potential ◽  
Toilet Paper ◽  
Drying Technology ◽  
Steam Drying ◽  
Special Meaning

Paper electromagnetic drying technology is a new paper drying technology different from traditional steam drying. Today, environmental pressure deteriorating, energy crisis approaching, doing researches on paper electromagnetic drying technology has a special meaning, especially to high speed toilet paper machine which is truly needed and has a vast developmental potential. This thesis is based on electromagnetic dryer and steam dryer study. And the changes measured in the experiment at diverse temperatures and quantities in the experiment has shown a higher efficiency of electromagnetic drying technology than conventional steam drying technology.

Paper Machine Bearing’s Temperature and Air-Velocity Optimization under Air-Oil Lubrication

2012 ◽  
Vol 550-553 ◽  
pp. 3054-3058
Author(s):  
Feng Zhang ◽  
Gong Bo Han ◽  
Su Xia Duan
Keyword(s):  
Temperature Field ◽  
Velocity Field ◽  
High Speed ◽  
Paper Machine ◽  
Lubrication System ◽  
Oil Lubrication ◽  
Air Velocity ◽  
Temperature Field Distribution ◽  
Temperature And Pressure ◽  
Lubrication Effect

The purpose of this resarch was investigated the air-oil temperature field distribution under air-oil lubrication and oil lublubrication, meanwhile also study the air-oil lubrication effect under different air velocity inlet the bearing cavities of the high-speed paper machine dryer section. Base on the CFD theory, the temperature field of CARB bearing outer ring and the velocity field of the bearing cavities were simulated by the FLUENT software.Result show that air-oil lubricatin can reach the same cooling effect is contras with oil lubrication in the same heat production by roller; the best air-velocity value of air-oil lubrication system is obtain for the change of temperature and pressure in bearing cavities. It is confirm that the air-oil lubrication is viable in the high-speed paper machine dryer section.

Application of process simulation to operator training and startup of a high-speed paper machine

SIMULATION ◽  
1967 ◽  
Vol 8 (4) ◽  
pp. 203-208
Author(s):  
Robert R. Rounsley
Keyword(s):  
Process Simulation ◽  
High Speed ◽  
Control Program ◽  
Paper Machine ◽  
Effective Operator ◽  
Careful Planning ◽  
Operator Training ◽  
Rates Of Change ◽  
Long Time ◽  
New Machine

Because of the complexity of operation of a paper machine, a simulation of operation would provide three avenues through which better startup and operation could be obtained: (1) engineering evaluation, (2) operator training, and (3) control-program evaluation. Prior to the startup of a new high-speed paper machine, a simulation of the stock system where the suspended fibers are formed into a sheet of paper was undertaken. Basic information on the steady-state and dynamic be havior of such a system was obtained on a highly instru mented paper machine having components similar to those of the new machine. The system was analyzed one component at a time to fit available theoretical equations with minor modifications. This allowed reasonable extrap olation and reassembly of the system to describe the new machine. An important factor in describing such a system was the transport lag in the pipelines. This facet of the simulation was accomplished with prewired Padé approximations of these lags. A second important characteristic in describing a paper machine in real time is the long time-constants involved in the rates of change. These may run as long as 10 minutes. A replica of the main control panels was constructed for use as a training aid for the operating crews of the new machine. The panels were programmed on the computer to respond to upsets and grade changes as part of an inten sive training program for the operators. Exploitation of the simulation system is still in progress. It is evident, however, that the smooth startup resulted from careful planning and effective operator training.

Infrared Electric Emitters for Drying Paper

2010 ◽  
Author(s):  
Amanie N. Abdelmessih ◽  
Michael A. Beakley ◽  
Steven B. Campbell ◽  
Eric W. McKnight ◽  
Michael P. Roberts ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Capital Investment ◽  
High Speed ◽  
Paper Industry ◽  
Paper Mill ◽  
Paper Machine ◽  
Paper Machines ◽  
Section Design ◽  
Retrofit Design ◽  
Primary Form

The paper industry is the second largest consumer of energy in the Northwest. The majority of energy consumption in any paper mill occurs in the paper dryer section. This article presents a unique, complete dryer section design that is more economical than conventional paper dryers. The proposed dryers use infrared radiation as the primary form of heat transfer. The infrared dryer section design is compared to the conventional steam dryer section for a high speed newsprint paper machine. Since conventional steam dryer sections in paper machines are a major capital investment and last for decades, a simple, economical retrofit design of a conventional dryer section is included.

The Design of Decoupling Control System for Air-Cushioned Head Box of Paper Machine Based on Siemens S7-PLC300

2012 ◽  
Vol 457-458 ◽  
pp. 1105-1110
Author(s):  
Yan Jing Meng ◽  
Bin Zhou ◽  
Yuan Yuan Liu
Keyword(s):  
Control System ◽  
High Speed ◽  
Decoupling Control ◽  
Mathematics Model ◽  
Paper Machine ◽  
Non Linear

Small motions will result in heavy influence to the production in high-speed paper machine, therefore, decoupling control is necessary. This passage Puts forward the opposite angles strategies to solve the function of decoupling aiming at solving the difficulty that occurs in practice, like the characteristic of hard-coupling and non-linear. According to the mathematics model of the flow box, decoupling the quantity of the two couplings in the processes. Meanwhile, Introduces the SIEMENS S7-300 PLC and the DCS system that is realized by the it.

scholarly journals Wetend Concept of High Speed Paper Machine for Woodfree Grade

1999 ◽  
Vol 53 (8) ◽  
pp. 992-998,032
Author(s):  
Yasuhiro Hatano
Keyword(s):  
High Speed ◽  
Paper Machine

Factors affecting the free shrinkage of handsheets: apparent density, fines content, water retention value, and grammage

TAPPI Journal ◽  
2018 ◽  
Vol 17 (06) ◽  
pp. 317-325
Author(s):  
Nader Mayeli
Keyword(s):  
High Speed ◽  
Water Retention ◽  
Paper Machine ◽  
Pulp Fibers ◽  
Machine Direction ◽  
Free Shrinkage ◽  
Factors Affecting ◽  
Cellulosic Fibers ◽  
Manufacturing Efficiency ◽  
The Web

Industrial papermaking is a high-speed process during which a suspension of cellulosic fibers is formed into a continuous web via dewatering followed by drying. Dewatering in the paper machine occurs mechanically in the forming and pressing sections; however, most of the remaining water, whose removal requires applying high temperatures, evaporates in the dryer section. As a result, the paper web shrinks, due to the shrinkage of individual fibers in the paper web. On the paper machine, the paper web is under restraint in the machine direction (MD), whereas it can shrink in the cross-machine direction (CD). The edges of the web shrink more than the center of the web. A shrinkage profile is therefore created in the CD of the web. All machine-made papers exhibit a CD shrinkage profile. The CD shrinkage profile is significant because it affects the final product quality and manufacturing efficiency. The prime cause of the CD shrinkage profile during drying is free shrinkage. The effects of several wood pulp fibers on the free shrinkage of handsheets were investigated to obtain deeper understanding of the mechanism of paper shrinkage during drying processes.

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