TESTING AND MEASURING Improved contact Mechanisms of high viscous Rubber Compounds on Calender roll Surfaces by using different Tackifier – Part 1

High viscous rubber compounds often lead to processing difficulties during ca lendering. The inefficient TACK behavior of the compound leads to premature detachment of the calendered slab and causes wrinkling and blistering, trapping of air and geometric fluctuations in thickness and width. The use of suitable tackifier can help to improve the tackiness of the compound to produce high-quality rubber sheets. The selection of a suitable tackifier also depends on the compatibility and interaction with the rubber compound. 

Calendering is a commonly used process in the rubber industry to produce high quality rubber sheets with high geometrical accuracy and low thickness. A calender consists of coaxially arranged pairs of rolls which rotate in opposite directions and are held by a framework. The calender rolls can be adjusted to a desired processing temperature and each roll can individually be set to defined rotational speed to create friction. The rolls are usually chrome-plated with a low surface roughness.