Patent ID: 6508751
Filing Date: 2003-01-21
Classification: B31B

Abstract:
A device for folding corrugated container board having a corrugated medium and a liner formed thereon comprising:a tool for displacing the liner inwardly with respect to the board and compressing the corrugated medium in portion of the board to reduce the thickness of the board and to form a gradually curved indentation therein without adversely affecting the integrity of the corrugated medium; a separate tool for forming a line of weakness in the liner along the curved portion of the board, said line of weakness separating the board into side-by-side panels; a separate tool for urging one of said panels down around said line of weakness to fold said board along said line of weakness; and wherein the displacing and compressing tool comprises a rotatably supported backing ring with a peripheral face having a substantially flat profile and a cooperating rotatably supported forming ring with a peripheral face having a gradually curved profile of a width less than the width of said flat profile, a nip formed between the peripheral faces of the forming and backing rings for receiving the container board, wherein the curved profile of the forming ring cooperates with the peripheral face of the backing ring to displace the liner and compress the corrugated medium to form the curved indentation in the board and to reduce the thickness of the board.