1. The roller must be clearly printed with the manufacturer's mark on the outer end of the bearing seat;

2. The roller should be packed and transported, and the packaging must be firm and reliable. Use soft objects to separate the rollers; 3. The following items should be marked on the outside of the roller packaging box: 3.1 Name and specification model of the roller; 3.2 Manufacturer's name, address, phone number, trademark and year of production; 3.3 Production license number and quality system Marking; 3.4 Marked with moisture-proof, fragile, and stacking height requirements. 4. The rollers should be stored indoors.