Patent ID: 8691125
Filing Date: 2014-04-08
Classification: B29C

Abstract:
1. An injection molding apparatus comprising: a first mold; a second mold that moves relative to the first mold; the first mold and the second mold being clamped to form a cavity that has a long shape, and includes a portion where a ratio of a first dimension and a second dimension changes continuously such that the portion where the ratio of the first dimension of a pair of first surfaces that face each other along a mold opening direction in a section orthogonal to a longitudinal direction and the second dimension of a pair of second surfaces that face each other along a direction perpendicular to the mold opening direction becomes 1 locates in an intermediate portion of the cavity in a longitudinal direction of the long shape; a first temperature adjusting circuit that is provided at the first mold and the second mold to adjust a temperature within a range where the second dimension of the second surfaces is greater than the first dimension of the first surfaces such that the temperature of the pair of first surfaces becomes higher than the temperature of the pair of second surfaces, wherein the first temperature adjusting circuit has a first surface circuit that adjusts the temperature of the pair of first surfaces, and a second surface circuit that adjusts the temperature of the pair of second surfaces, and has a heat-insulating structure between the first surface circuit and the second surface circuit; and a second temperature adjusting circuit that is provided at the first mold and the second mold to adjust a temperature within a range where the second dimension of the second surfaces is smaller than the first dimension of the first surfaces such that the temperature of the pair of first surfaces within the range becomes lower than the temperature of the pair of first surfaces whose temperature is adjusted by the first temperature adjusting circuit.