This thesis investigated the effect of an induction sealing process and time on the removal torque of continuous thread and child resistant plastic closures. An application torque of 19 in-lb was applied to the high density polyethylene (HDPE) bottle/closure systems. After passing the bottle/closures through the induction sealer, the immediate removal torque values were measured and recorded. Additionally, sampled bottles/closures were set aside and removal torques were measured over time.
A statistically significant (P<0.001) removal torque reduction was observed from the non-induction sealing process versus the induction sealing process, varying from 60.7% to 72.6%. The data confirmed that the removal torque values were affected by the induction sealing process. The data also indicated that the removal torque values increased during the two weeks duration after the induction sealing process. The removal torque values increased from 24.5% to 44.9%.
Department, Program, or Center
Manufacturing and Mechanical Engineering Technology (CAST)
Deanna M. Jacobs
Su, Hoong Say, "The Effect of Induction Sealing and Time on Removal Torque of Continuous-Thread and Child Resistant Plastic Closures" (2010). Thesis. Rochester Institute of Technology. Accessed from
RIT – Main Campus