Sheet-decorating injection molding apparatus and method

摘要

A sheet-decorating injection molding apparatus is provided with a sheet clamper (30) for fixedly holding a decorative sheet (S) on a parting surface (12a) of a movable mold (12) of an injection mold. At least inner edges of surfaces facing the movable mold (12) of the sheet clamper (30) are finished in smooth, convexly curved surfaces (30a), respectively, and a groove (29) for receiving the sheet clamper (30) therein is formed in a fixed mold (25) at a position corresponding to the sheet clamper (30) in a depth sufficient to permit the movement of the sheet clamper between a position to hold the decorative sheet fixedly on the parting surface (12a) of the movable mold and a position to be separated from the decorative sheet in a state where the injection mold is clamped. The sheet clamper (30) fixedly holding the decorative sheet (S) is moved away from the parting surface (12a) of the movable mold and separated from the decorative sheet to release the decorative sheet at a timing during a period between the completion of a mold clamping process and the start of a mold opening process and is moved further away from the parting surface (12a) of the movable mold (12) as the movable mold is moved further away from the fixed mold (25) after the start of a mold opening process. <IMAGE>