Tissue Machine Technology of Andritz

—Stock Preparation and Shoe Press—

Abstract

In this report, described are three characteristic topics which Andritz has in its tissue machine technology. First the ShortFlow system, which can realize a concept “Paper is made in the stock preparation process”, is made up of a few numbers of equipment and verified control technology. It can improve reproductivity of the operation and make changes of paper grade and color smoother. Next we reviewed a basis of the refining theory and then two types of the Andritz refiner is presented, that is, Cylinder type refiner （Papillon refiner） and Disc type refiner （Twin flow refiner）．Both can realize to improve fiber strength and fiber flexibility with keeping refining conditions constant during refining process. Last Andritz third generation shoe press is presented. Its load mechanism can make the cross direction line load perfectly even. It has also a flexible shoe design and edge control system. Therefore the shoe can follow the Yankee contour faithfully. It has both higher dryness mode and higher bulk mode and the mode adjustment can be made on the run.