Logic for Issur: Once the lid is soldered the can become a ??? ???? and is no longer a Kli.
Excepted from http://www.etzion.org.il/vbm/archive/yomyom/g/g47.php
?????? ??? ?????? ??????? ??????? ??? ?”???? ???” (??”? ?”?, ??), ???? ?? ?????? ????. ?”???? ???” ????? ?????? ???????? ???? ????? ?’???’ ???? ??????, ??? ??? ????? ??? ????? ??? ???? ?????? ??. ???, ????? ????? ??????? ???? ???? ?? ????? “????” (?? ?????? ???? ???), ?? ??? ???? ?? ????? “????” – ??? ???? ?? ?????? ?????? ???? ????? ????? ??????? ??. ???? ?”????? ??? ??????” (?’, ?-?) ???? ????? ????? ???? ??????? ????? ????? ??????? ???.