| 摘要 |
PROBLEM TO BE SOLVED: To prevent the film from folding into a container side even when the film is stored for a long period of time after a center-sealing by a method wherein when the cylindrical heat-shrinkable polyester film having a pattern wherein the top and the bottom ends are non-printed parts, of an internal surface printing, is placed on a container and shrunk, and after the film upper end is pre-shrunk, the whole body is heat-shrunk. SOLUTION: When a cylindrical heat-shrinkable polyester film having a pattern wherein the top and the bottom ends are non-printed parts, on which an internal surface printing is applied is placed on a container and heat-shrunk, and the upper end of the film is pre-shrunk in advance, and then, the whole body of the film is heat-shrunk. A film which is normally printed is center-sealed, and flatly folded, and taken up by a hank or a paper pipe, but when the total, amount is not used right away, and is stored for a long period of time, a residual solvent of a printing ink in the cylindrical state is gradually absorbed by the film, and by a permeability in the film, an absorption gradient is generated, and the film is folded into the container side, and both of the internal side and the external side of the non-printed part at the upper end are prevented from receiving effects of the residual solvent, and a folding-in is prevented from arising. |
