One of the most important parameters of the finished seam is the Wrinkle / Tightness rating. All 3-piece can makers and canneries are required to test the Wrinkle of at least one can per seaming head at least once per shift. The teardown process (removing the bodyhook for the Wrinkle rating) has

Wrinkle rating is a critical measurement when assessing if a can is airtight hermetically sealed. One way to measure this is to do a manual inspection and assess the value of the wrinkle measurement. A can will often leak if it does not meet its wrinkle rating specifications.

The

The importance of wrinkle rating has been known for many years. This, as well as FDA regulations, require the teardown of cans in order to manually inspect the wrinkle rating of those cans. Beverage cans can appear to be closed hermetically, but when wrinkle rating is outside the