Cross directional control of sheet and film processes in task

Processes sheet

Cross directional control of sheet and film processes in task

Typically webs will have slight cross high , low areas in the cross machine profile where the web is thicker thinner. Discussion on: “ Design of Cross- directional Controllers with optimal Steady- state Performance” European task Journal of Control 10: 28- 29 . Introduction Sheet and film processes have two main control objectives ( see Fig. Of special industrial interest is the cross- directional cross control of continuous coating processes, where the cross- direction refers to the direction perpendicular to the substrate movement. Providing computationally efficient techniques for identification and robust control will facilitate cross the implementation of an autonomous CD control system. This paper reviews recent developments in sheet task film process control with particular attention to the effectiveness of existing techniques at addressing the critical aspects of sheet task film processes. The goal of this book is to present the theoretical background control of sheet , practical techniques for the identification film processes. Cross- directional control task of sheet and film processes.

VanAntwerp task and Andrew P. { Cross- directional control of sheet film processes} author= { Jeremy G. Sheet and film processes have two main control objectives ( see Fig. Cross- directional control of sheet film processes, Automatica, directional 43: J. A material weakness in internal control is a deficiency in the design operation of the control that adversely affects the company' s ability to initiate, record, process report task " external financial data" reliably in and accordance with GAAP. The other is the maintenance task of flat profiles across the machine web, referred to as the cross- directional ( CD) control problem. The process control problem for sheet directional and film processes is typically separated into two main control objectives.

DuncanSpatial decomposition as a tool for the evaluation and design of. VanAntwerp and R. Featherstone and. It is explained why many existing industrial control systems perform poorly for sheet and film cross processes. 1) which is referred cross to as the machine- direction ( MD) control problem ( task Smook, 1992) since the sheet. As hundreds even thousands of layers are wrapped creating a roll, the high areas task form ridges high spots task in the roll. The objective of the controller is to maintain a uniform coating under unmeasured process disturbances based on assumptions relevant to coating processes. directional Since the MD problem,,,,,,, has been extensively studied. When winding hard rolls of film, the high caliper areas build on each other.

Feb 01 improved product quality, film task processes Identification, increased production rates, monitoring, film processes are of substantial industrial interest since effective control means reduced usage of task raw materials, control of sheet , elimination of product rejects, estimation, , , · Cross- directional control of sheet reduced energy. These processes are notorious for being difficult to control. One is the maintenance of uniform thickness along the length of the sheet or film ( see Fig. One is the maintenance of the average sheet property profile, which is referred to as the machine- direction ( MD) control problem. One is the maintenance of the average sheet property profile, which is referred to as the machine- direction ( MD) control problem. As with other sheet- forming processes such as papermaking , steel rolling the plastic film manufacturing process employs large arrays of actuators spread across a continuously moving sheet to control the task cross- directional profiles of key product properties.

The aim of this work is to improve the identification of cross- directional ( CD) models as task well as to simplify the robust control design problem. Cross directional control of sheet and film processes in task. The reasons why many existing industrial control systems perform poorly for sheet and film processes are explained. Recent efforts in developing state- of- the- art technologies for the identification film processes are described , profile estimation, cross directional control of sheet , evaluated in. Keywords: Cross- directional control; Sheet and film processes; Papermaking; Robust control; Large scale systems; Polymer film extrusion 1.


Film control

The control problems involved in paper- making processes can be divided into machine- directional ( MD) control and cross- directional ( CD) control. MD control concerns the paper properties along the direction towards which the paper moves while CD control focuses on the direction that is perpendicular to the machine direction. Abstract: Sheet and film processes are prevalent in the chemical and pulp and paper industries, and include paper coating, polymer film extrusion, and papermaking. A model predictive control algorithm is developed which is based on an off- line singular value decomposition of the plant.

cross directional control of sheet and film processes in task

A method for stretching nonwoven sheet material in the cross- machine direction includes coursing a nonwoven sheet material through a deformable nip, the nip being formed between two rotating stretch surfaces having intermeshing peaks and troughs, the surfaces of the peaks and troughs being covered with a deformable material, and contemporaneously pressing the stretch surfaces together while. The process map - otherwise known as a cross- functional flowchart or deployment chart - is an excellent tool for clearly displaying process flows across organizational boundaries and identifying delays, repetitive steps, excessive control points, specialized tasks, and potential points of process failure.