Torque testing of PET bottle closures is performed to identify the torque required to open a closed cap. Systematic testing informs line managers that their capping machines are applying sufficient torque to produce the necessary degree of seal - but not excessive torque, which would make opening difficult.
"Spinners" are an unwanted occurrence in capping and can be caused by materials or excessive capping torque. Normal spinners are of two types:
Following slip (initial break) torque, the cap's bridges do not break and the cap spins around the thread but is not separable from the bottle, resulting in a bottle whose cap is unscrewed but still attached.
http://www.torque-about-force.com/2012/05/packaging-bottle-c...

cap with breaking bridges
https://books.google.es/books?id=nkBPWe-AA0YC&pg=PA357&lpg=P... (figure 17.5)

los cierres roscados se preparan muy a menudo como los llamados "a prueba de robos", en los cuales existe un **anillo de seguridad* que se desgarra durante la apertura.
https://books.google.es/books?id=CiUqyDrm1OYC&pg=PA1013&lpg=...