Full definition
NN (nylon-nylon) conveyor belt fabric is constructed with both the warp and weft made of nylon (polyamide) fibers, providing enhanced performance characteristics compared to other fabric types. This type of conveyor belt is particularly advantageous in industries such as mining where the potential for high impact and severe dynamic loads is common. The nylon fibers offer superior tensile strength and flexibility, which results in higher impact resistance and greater elongation under load. For instance, NN belts can elongate up to 3% when subjected to load, allowing them to absorb shock and reduce the risk of damage during operations involving heavy material drops. In comparison, EP (polyester-nylon) belts typically elongate only up to 1.5%. This increased elongation of NN belts necessitates more extensive take-up travel in the conveyor system, especially in applications where the belt is frequently loaded and unloaded.
The construction of NN belts generally ranges from 2 to 6 plies, with breaking strengths varying from 315 to 2,000 N/mm. This versatility in ply number and strength makes NN belts suitable for a wide array of applications, from transporting bulk materials to handling heavy loads in harsh environments. The standard for these belts is defined by ISO 22721, which outlines specifications for the construction and performance of textile conveyor belts. Additionally, in certain markets, NN belts may also be referred to as PN, indicating their nylon composition. This nomenclature highlights the global nature of conveyor belt manufacturing and the importance of consistent standards across different regions.
In summary, NN conveyor belts are essential for applications requiring high durability, flexibility, and the ability to withstand dynamic loads. Their unique properties make them an industry standard in sectors where reliability is critical, ensuring efficient material handling even under challenging conditions.