Life Extension Of Auxiliary Roll
Auxiliary rolls are the contacting parts of calender machines, playing an important role in papermaking process. With its wide range of application, higher efficiency of calender requirement and harder working conditions, calender auxiliary rolls are subject to extensive wear and tear. It is of great concern to papermakers to extend their service life. It is therefore necessary to fully understand the characteristics of calender auxiliary rolls in use, and to take relevant measures to effectively improve their service life.
In order to effectively extend the life of calender auxiliary rolls, we must first understand its structure and working principle. In the papermaking process, the under wire of the papermaking machine is wrapped by the auxiliary roll and pressed onto the main roll. The structure of the auxiliary roll mainly includes two parts, the steel core and the rubber layer. The steel core is used to support the rubber layer so as to make it not deformed under pressure when the auxiliary roll is loaded by the main roll and under wire. The rubber layer has a good friction coefficient and conforms to the surface of the main roll. Therefore, during the papermaking process, the friction generated between the rubber layer and the main roll is used to press the under wire onto the paper surface, so as to obtain uniform paper.
In order to effectively extend the life of calender auxiliary rolls, we must first understand its working life. When two rolls are loaded with paper, the auxiliary roll will deform to ensure that the surface of the main roll and the surface of the auxiliary roll are in close contact with each other. Under the pressure of the two rolls, the rubber layer of the auxiliary roll can not be restored in a short time after being pressed out by the roll lobe of the main roll. Just as the tires of our car will wear if they do not pay attention when driving on the same track, the rubber layers of the auxiliary rolls also wear out due to long-term friction and pressure. Therefore, the calender auxiliary rolls must be properly inspected and replaced in time to prevent massive losses when the steel core passes through.
In order to effectively extend the life of calender auxiliary rolls, it is important to take corresponding measures during production. Firstly, it is important to adjust the parameters of calender accurately during calender operations and control the speed of main rolls and auxiliary rolls. When loading rolls of the same diameter, it is necessary to pay attention to ensure that the surface of the two rolls is in good contact, so as to avoid excessive pressure and heat generated between the two rolls, which will reduce the life of the calender auxiliary rolls. Secondly, it is necessary to take timely measures according to the wear condition of the rolls, including removing the cuttings and surrounding dust particles on the roll surface, filling and replacing the roll surface, and strengthening the roll core. Thirdly, it is necessary to do a good job in maintaining calender auxiliary rolls, including adjusting the lubrication system, keeping the sheet point of pressure balanced, and evenly distributing the main and auxiliary rolls between omg and calender operations.
In a word, it is of great significance to extend the service life of calender auxiliary rolls. By understanding the structure and working principle of calender auxiliary rolls, as well as taking corresponding measures during production, damage to calender auxiliary rolls can be effectively reduced, so as to reduce costs and improve efficiency of paper production.
