Paper Roller is an important part of the paper machine on an ordinary Fourdrinier there Cots seven, eighty, from the network until the drying section and press section which parts are almost inseparable Cots, it Cots structure, can be divided into rolls, grooved roll, suction roll, spiral roll, Curved rolls, high roll. In recent years, along with the paper machine speed and efficiency of the papermaking Cots requirements are getting higher and higher, the wet end of a good roll discharge requirements, the press and vacuum rolls require high hardness, high elasticity whole site density uniform, rubber roller shape of the lower resistance to high pressure and so on retention, easy to dehydration, easy to peel, easy finishing, and roll core and adhesive bonding strength. 1. The use of vacuum suction vacuum roll paper industry is modern technology that enables rapid dehydration sheet, reducing press process, can greatly increase production. Cots vacuum roller core material, mainly in bronze casting, surface covered with 25-30mm thick rubber layer, which has a diameter of 5-8mm drilled tens of thousands of apertures, each of the perforations wear through adhesive layer and roll core. 2. artificial stone roller press roll is generally made of natural stone rollers, rubber roller and a metal roller, artificial stone rolls mimic the characteristics of natural granite, resin, rubber, refining quartz sand blend. Its surface is hard as stone, smooth as a mirror and have a uniform distribution of the pores. 3. Polyurethane grooved roll in the roller surface car into a groove, mainly to improve their discharge, so as to cast molding polyurethane material polyurethane rubber roller, for high line pressure, requiring high-speed paper machines. 4. Controlled High cot in modern machine design, high fixed rubber roll has been increasingly unable to meet the needs, the use of a plurality of circular small pistons and hydrostatic bearing partition principle crown roll has been widely used