Motor Roller. Before tape is exerted under a retentive test (or peeling test), it must be completely bonding the glue on the steel board (stainless), so as to get the most correct testing results. To prepare an adhesive specimen is to adhesive the tape on the stainless steel plank by 2kg rubber pressing wheel run over it to make sure that stick on plank homogeneously. The fixed hardness rubber coating of wheel would increase the uniform adhesive when granding and pressing. Leave the testing finished specimen for over 20 minutes, and then can go on the next test movement.