Protecting the lens from harm on its way through the different steps in the process chain is a critical step. And its significance is often underestimated as power or cosmetic defects are often caused directly or indirectly by the tape. Especially with non-front coated blanks, the sensitive finished side of the blank needs to be protected from any contamination with alloy or non-alloy media.
Spin protection replaces tape, optimally covering even extreme lenses and protecting them ideally utilizing UV-curable liquid protection layers. No wrinkles, bubbles, or detaching.