Full definition
Drum lagging is a critical component in conveyor systems, particularly concerning the drive drums that propel the belt. This wear-resistant coating enhances the friction coefficient, which is essential for efficient power transmission. By increasing the traction between the drum and the conveyor belt, drum lagging prevents slippage, which could lead to significant operational inefficiencies and increased wear on the belt. Additionally, it serves to protect the drum shell from abrasion, extending the life of the drum and the overall conveyor system. Drum lagging also plays a vital role in managing the operational environment by channeling water and fines away from the contact zone, thereby minimizing potential disruptions caused by material buildup. The choice of drum lagging type often depends on specific operational conditions, such as moisture levels and material characteristics.
There are several types of drum lagging available, each designed for different conditions and applications. Smooth rubber lagging, typically 6-12 mm thick, is ideal for dry and clean conditions, providing a coefficient of friction (COF) of approximately 0.35. It is well-suited for environments where minimal traction is sufficient. In contrast, diamond-grooved rubber is the industry standard, featuring diagonal grooves that effectively channel water and fines away, resulting in a higher COF of about 0.40, making it suitable for a range of wet and dry conditions. Chevron-grooved lagging, characterized by V-pattern grooves, is specifically designed for very wet conditions, enhancing traction even further.
For extreme conditions, ceramic tile lagging offers unparalleled durability and performance. Comprising alumina tiles embedded in rubber, this type achieves a COF ranging from 0.40 to 0.45 and significantly extends service life—potentially 3-10 times longer than traditional rubber varieties. This makes it ideal for wet, abrasive, and high-tension applications. Installation methods for drum lagging can vary; cold-bonded (adhesive) applications are common for field repairs, while hot-vulcanized techniques are preferred for factory installations, providing a stronger bond. The hardness of the rubber typically falls between 60-70 Shore A, aligning with recommendations from organizations like CEMA and DIN 22101. Notably, using bare steel drums, which have a COF of around 0.25, is generally inadequate and can lead to belt slippage, wear, and overheating issues, emphasizing the importance of selecting the right type of drum lagging for operational efficiency.