| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that there is a characteristic easy to generate a pinhole in the case of a concrete form used for injection molding or the like and the appearance defect of a molded article or the abnormality of mold opening is brought about according to circumstances if the pinhole is generated and, if the filling with concrete does not reach a detailed part at the time of production of the form, the shape of a master model can not be faithfully transferred and labor and cost are required in the subsequent correction of the form. SOLUTION: A cylindrical concrete reservoir 10 is projected on the top part 3 of the main body part 11 constituting the form 2 and, when the main body part 11 is filled with concrete 5, a part thereof is allowed to overflow up to the interior of the concrete reservoir 10 and, thereafter, the concrete 5 overflowing the concrete reservoir 10 is pressed by a weight 12.
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