Application Research On Paper Quality Control System(QCS)

The paper is an important and indispensable consumer goods in the daily life, aswell as an important raw material for industrial production. With the improvement ofsocial production and people’s material and cultural living standards, people have ahigher requirement for the production and quality of paper products. People areconstantly using the new paper-making technology and equipment, expanding themachine size, improving machine speed, and increasing paper production and quality.The growing problem of worldwide energy shortages and industrial pollution makes thepaper production process more complex, so computer automatic control in theproduction process has become an inevitable means.Paper basis weight, moisture and ash are the most important quality indicators ofthe paper production process, and to achieve precise control of them has become animportant goal of the paper production. Based on the theoretical summary of relevantforeign and domestic literature, the thesis concludes some theory and technology on themeasurement principle of the quantitative, moisture and ash, the correction andcompensation of detection signal, the control characteristics of quantitative, moistureand ash, as well as problems and measurements during daily application process.Taking the newly built3700/3800paper machine project of Shandong Quanlin Co.,Ltd (the domestic large paper company) as its background, the topic concludes thequality control system (QCS) of this project. The full text is divided into the followingsections:The first part describes the current development and trends of the domestic paperindustry, as well as QCS, the subject background.The second part introduces the overall structure and basic composition of the QCS withthe combination of paper-making process.The third part analyzes the characteristic of monitoring object, the measuring theory ofmoisture; quantitative and ash; quantitative, moisture and ash sensors; and the dilutionvalve of new type dilution water headbox.The fourth part analyzes the factors that affect the quantitative, moisture and ashfluctuations, and makes the control scheme by combining paper production process.The fifth part studies the software system of the machine QCS system, introducesquality control system network topology, and focusing on the function and use of quality control system is the most frequently used application screen, the quality controlsystemperformance and technical characteristics.Part sixth summarizes the failures and problems of paper quality control systemduring use, as well as the measures to deal with the problem based on the author’s dailyaccumulation of experience.