PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 8, Number 1, 2022
Eli M. Gray-Stuart, Kelly Wade, Gabe P. Redding, Kate Parker & John E. Bronlund, Packaging Technology & Science , (2022) online. To understand the effect of load and relative humidity (RH) on box creep in cool storage conditions, standard tests are performed. However, these test conditions are oversimplified compared with actual shipping conditions. Our aim is to develop test conditions that more closely mimic those encountered during refrigerated conditions to investigate their influence on creep performance and box lifetime. We compared three box preparations: (i) empty boxes used as a control, (ii) filled boxes, and (iii) boxes with only two side panels exposed to the atmosphere. A controlled environment test facility was used to subject sets of 24 boxes to 30% of their ultimate failure load under different cyclic and constant relative humidity conditions. Results indicate that filled boxes had substantially reduced performance in terms of secondary creep rate and lifetime. The fill in the box contributed to out-of-plane displacement of the side panels which manifested earlier than in the control, resulting in a higher creep rate. Boxes with only two exposed panels had lower moisture uptake and performed substantially better than the control. These findings demonstrate how creep performance and box lifetime depend on the box conditions including fill and the area of the box that is exposed for moisture transfer. Alternative box preparations which mimic supply chain conditions are worthy of investigation in creep analysis as they will help predict more accurately box performance in the cold supply chain. PAPERMAKING “ Optimization Methods For Control Systems of The Headbox And The Cross Direction Control on Papermaking Machines ”, Zhe Mo, Journal of Physics: Conference Series 2183 (2022) 012019. This paper briefly introduces the Headbox and the Cross Direction, and analyses challenges in their control systems. The main challenges in these two control systems are nonlinearity and parameter coupling. To solve these problems, or at least reduce the influence of these problems on the control systems, a few optimization methods are proposed. In this paper, some practical optimization methods are introduced based on modified PID control, which is the most commonly used control system in process industries, such as the paper-making industry. Those methods optimizing the PID control system can be mainly divided into two classes: decoupling and PID tuning. Besides, some practical methods optimizing the Cross Direction control systems are introduced. Also, the introduced methods can be divided into two classes: CD tuning and cooperating with parameters of the headbox system to optimize. The effectiveness of these methods is demonstrated in simulations. However, since the nonlinearity of the system, there is no accurate and unique solution. In addition, with the development of demand and technology, there will be no such thing as an algorithm suitable for every control system, so that new algorithms will be proposed. “ Design of SA and GA Optimized PID Controllers for Controlling Blend Chest Level of Paper Mill ”, Abhijit Singh Bhakuni, Sandeep Kumar Sunori, Shweta Arora, Amit Mittal, Prakash Garia, Sudhanshu Maurya & Pradeep Juneja, 4 th IEEE International Conference on Smart Systems and Inventive Technology (ICSSIT), 2022. The present research paper is based upon the blend chest process pertaining to the paper making mill. There is always a requirement of controlling the outputs of multiple units involved in paper making like blend chest, headbox, wire, press section, dryer, calender, and reel unit. The final output is good quality paper rolls. To achieve this control, automatic feedback controllers are employed in paper mills. In this work, 2 different optimization algorithm viz. Simulated Annealing (SA) and Genetic Algorithm (GA) have been utilized to develop the control system using the MATLAB for monitoring of the blend chest process. At the end, the performance comparison of the developed control systems is performed.
Technical Abstracts
Page 7 of 15
Made with FlippingBook - Online magazine maker