| 摘要 |
PURPOSE:To prevent a sink mark, in particular, a sink mark at a point where reduction in thickness is undesired from occurring when cooling is effected, by inserting as part of the intended item a sink mark preventing member having a configuration that makes a thickened part have a uniform thickness that would not interfere with the molding, and effecting the molding. CONSTITUTION:For example, a sink mark preventing member 13 is formed to have a configuration corresponding to the space between an outer wall 11b and a thickened section 11a of the intended plastic molded item 11 such that the sink mark preventing member 13 can serve to omit an excess thickness between the outer wall 11b and the thickened section 11a, and a pinlike projection 13a at the middle of the upper surface of the sink mark preventing member 13 is fitted into a mounting hole 14a of a mold 14 so that the sink mark preventing member 13 is preset and nested in the mold 14. Then molding is effected using the mold 14 with the sink mark preventing member 13 having therein so that the thickened section 11a having a tapped hole 12 can be molded integrally with the plastic item 11. EFFECT:The design of an intended item is not restricted by a mold. |
