Mold IMD (2) for manufacturing a plastic part decorated with a film sheet, a half-mold (6) facing the film sheet and a mold half (8) opposite the film sheet comprising, being able placing the two mold halves side by side with corresponding separating surfaces of the mold (14a, 14b) so that together form a cavity (10) substantially closed to the outside, the surface mold separation (14a) being the semi-mold (6) facing the film sheet formed by an inner part (12a) surrounding the cavity (10) and an outer portion (13a) surrounding this in turn, the outer portion (13a) being a parting plane of the mold (F) at least substantially flat or curved one-dimensionally, being the separation plane of the mold (F) inidimensionalmente curved, a curved surface in one direction and a non-curved surface in a direction that is pependi cular to it and the inner part (12a) being the plane of mold separation (F) retrodesplazado, characterized in that the separating surface mold (14a) of the semi-mold (6) facing the film sheet formed in the inner part (12a) a collar (15a) arranged cross section straight obliquely to the separation plane of the mold (F), wherein the inner edge undergoes a transition at an obtuse angle to the wall (22) the cavity (10).
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