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Roller conveyor chains are common used to transport goods in production lines or assemblylines, such as pallets, cars or steel coils. They are sometimes used in severe environments, soiled withwater, foreign particles, chemicals or other contaminants. Normal use will result in wear of the componentsof the chain which can lead to unexpected failure and costly production downtime. Today, few literature onthe wear of conveyor chain is available and there are almost no reliable test-rigs to generate and measurechain wear in a reproducible manner. In this research the different components of conveyor chains and theloading conditions are described. Additionally, the applications and (dis)advantages of chains with polymerrollers are discussed. The chain wear mechanisms found in literature are listed. Abrasive and adhesivewear between pin, bushing, roller and track are discussed. From the contact mechanics of the chain andpressure-velocity limit of the roller materials, the design constraints for the laboratory test-rig were derived.The capabilities and working principles of the developed test-rig are explained in this paper.

The current paper intends to evaluate the influence of the cooling time on friction results duringbraking performed on a laboratory-scale tribometer. At the same time, a possible correlation between theoxidation process and emissivity on the disk surface during cooling time is investigated. Sample and diskused in the tests are from a commercial available brake car. Procedure includes changes in the coolingtimes, where 4 different conditions are experienced: 18s, 90s, 600s and 24h. Friction curves revealdifferences between the results obtained with 18s, 90s and 600s. Likewise, when a cooling time of 24h isused, the first stop shows a considerable reduction in the coefficient of friction. It was not possible to find outthe reason for this effect since relationship between friction and oxidation degree, verified by means ofemissivity on the disc surface, could not be encountered.

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