Pathological sample cassette lids seal tissue samples, requiring firm fit, corrosion resistance and easy marking, adapting to pathological tissue fixation and dehydration processes, no sample contamination and leakage. Traditional mechanical clamping has gaps, easy loss of small tissue samples, affecting pathological diagnosis. DaokeDao laser welding realizes seamless sealing of cassette lids and main bodies, suitable for medical-grade PP materials, forming a firm weld, no sample leakage and fixation solution volatilization. The weld has good chemical resistance, adapts to pathological fixative and dehydrant erosion, no corrosion and deformation. The welding process is clean and particle-free, no contamination of tissue samples, ensuring pathological diagnosis accuracy. The equipment supports high-volume production, with consistent quality, low cost, helping pathological consumable manufacturers improve product reliability and meet clinical pathological detection needs.