Pathological tissue embedding cassettes store tissue samples during embedding, requiring firm sealing, corrosion resistance, and easy handling, ensuring sample integrity and no contamination. Traditional mechanical clamping has gaps, leading to fixative leakage and sample damage, while adhesive bonding is difficult to remove during sectioning. DaokeDao laser welding realizes seamless sealing of cassette lids and main bodies, suitable for medical-grade PP materials, forming a firm weld that is easy to open during sectioning, no sample damage. The weld has good chemical resistance, adapting to embedding reagents and fixatives, no corrosion. The process is clean and particle-free, no sample contamination, ensuring pathological diagnosis accuracy. The equipment supports high-volume production, cycle time 5-7 seconds per unit, production capacity 170 pieces per hour, helping pathological consumable manufacturers improve product usability and diagnostic efficiency.