Seamless can and method for printing on seamless can

摘要

A seamless can in which an ink layer is transferred onto a can body thereof by a curved surface printing is provided. The ink layer which has been transferred has an overlapping portion which is formed by mutually overlapping a front-end portion of the ink layer and a rear-end portion of the ink layer in a circumferential direction of the can body. An ink area ratio for at least one of the front-end portion and the rear-end portion is smaller than an ink area ratio of an intermediate portion of the ink layer which is adjacent to and continuous with the overlapping portion and excludes the overlapping portion.

主权项

1. A seamless can in which an ink layer of a plurality of different colors is transferred onto a can body of the seamless can by a curved surface printing, the curved surface printing being one of relief printing and waterless offset printing, and wherein:
the ink layer which has been transferred onto the can body includes an overlapping portion, the overlapping portion being formed by mutual overlapping of a front-end portion of the ink layer and a rear-end portion of the ink layer in a circumferential direction of the can body; an ink area ratio for at least one of the front-end portion and the rear-end portion is smaller than an ink area ratio for an intermediate portion of the ink layer, wherein the intermediate portion is adjacent to and continuous with the overlapping portion in the circumferential direction and excludes the overlapping portion; the ink area ratio for both of the front-end portion and the rear-end portion is controlled by changing an ink area ratio of halftone dots; the seamless can is dried by heating after varnish is applied on the ink layer; a length of the overlapping portion in the circumferential direction is more than 0 mm and not greater than 3 mm; and the can body is subjected to a neck-in processing by a die-neck processing.