| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for injection molding a cylindrical molding capable of reducing a post contraction and having a uniform density, few warp, deformation, residual strain or the like, no contraction unevenness, accurate dimensions and high appearance. SOLUTION: The method for injection molding a cylindrical molding comprises the steps of filling a resin in a mold A in a state in which a peripheral wall surface temperature of a cavity K is a high temperature of a melting temperature or higher of the filling resin, holding its temperature for a while after filling, then rolling a core die 5 while decentering the die 5 in the cavity mold 1, and cooling to solidify the filled resin while compressing the resin between the die 5 and the mold 1.
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