Full definition
Rubber skirts are essential components in bulk material handling systems, serving as an effective barrier to contain materials during transfer and loading operations. These thick elastomer strips are primarily installed on the sides of hoppers, chutes, and conveyor loading zones, where they play a critical role in preventing spillage, dust emissions, and material loss. Made from materials such as natural rubber (NR) or high-abrasion styrene-butadiene rubber (SBR), these skirts are designed to withstand the harsh conditions often present in industrial environments. With a hardness rating of 60-70 Shore A, they provide maximum wear resistance against abrasive ores and aggregates, ensuring longevity and reliability in operation.
The design specifications for rubber skirts typically include a thickness ranging from 6 mm to 25 mm, which is determined by the severity of material impact and the operational speed of the conveyor system. The width of rubber skirts usually falls between 150 mm and 400 mm, allowing for adequate surface contact and sealing capabilities. Skirting is mounted in adjustable brackets to facilitate both vertical and lateral positioning, ensuring light contact with the moving belt surface. This dynamic sealing capability is crucial, as it helps to contain materials while minimizing wear on the belt itself.
When selecting skirt rubber, it is vital to balance softness for effective sealing against excessive belt wear and durability to resist gouging from sharp materials. Regular maintenance is crucial; skirts should be replaced when they reach 50% of their original width or when there is evidence of material escaping from the conveyor system. Natural rubber generally provides 2-3 times the wear life of SBR in impact abrasion conditions. For applications involving fine or highly abrasive materials, polyurethane (PU) skirts are available, offering 3-5 times the lifespan of NR. Furthermore, dual-seal designs that incorporate a primary skirt and an outer dust curtain can further enhance containment and dust suppression, adhering to guidelines set forth by the Conveyor Equipment Manufacturers Association (CEMA) and Martin Engineering.