Currently, common accessory materials on the market include ordinary recycled plastics, engineering plastics, and metal inserts. While ordinary recycled plastics are cheaper, they are prone to stripping, cracking, or aging and embrittlement under long-term load or repeated adjustments, especially at joints and stress points. These problems can directly lead to structural loosening, thus affecting safety.
In contrast, engineering plastics such as nylon (PA) and polyoxymethylene (POM) exhibit superior wear resistance, creep resistance, and dimensional stability. For example, adjustment knobs and gears made of POM material have fatigue resistance properties that ensure desks and chairs remain accurate and stable after multiple height adjustments, significantly extending their lifespan.
Furthermore, using a metal-plastic composite design in key load-bearing connections can significantly improve performance. For example, pre-embedded metal threaded sleeves at screw connections can effectively prevent plastic threads from wearing off and stripping due to repeated disassembly, thus greatly extending the product's maintainability.
Besides material selection, accessory design also needs to consider environmental adaptability. Materials with poor weather resistance are prone to deformation in environments with large temperature differences, affecting the fit precision between components and the main structure. Therefore, when selecting component materials, the intended use environment must be fully considered to ensure the materials maintain stable performance under various conditions.
In conclusion, the selection of materials for plastic school desks and chairs is not a trivial matter. While using high-quality engineering plastics or appropriate metal reinforcement may increase costs, it can fundamentally reduce the failure rate during use, extend the overall service life of the desks and chairs, and provide schools and other users with a more reliable user experience and lower overall ownership costs.