The production of coated springs involves a series of mechanical and coating processes that require high engineering precision. After selecting spring steel wire with a controlled carbon and silicon composition, the coiling process is performed using automated machines to maintain uniform torsion tolerance. The springs then undergo heat treatment (tempering) to enhance elasticity and improve their ability to return to their original shape after deformation. In the final stage, a polymer coating resistant to UV radiation and corrosion is applied to the surface of the spring, ensuring durability in greenhouse environments. Before packaging, each batch of products is measured and subjected to tensile testing by QC personnel to verify quality and performance. The result of this process is a product with long service life, strong resistance to rust, and stable performance under fluctuating temperatures—features that make coated springs an ideal solution for installing polyethylene and polycarbonate greenhouse coverings.