| 摘要 |
An injection molded article (8) with which a sheet-like material (5, 9) such as a decorative sheet is integrated is manufactured without causing damage to the sheet-like material (5, 9). The molten resin (25) injected into a mold cavity (19a) passes smoothly a peripheral edge (A) of a mold cavity (19a) and flows into a groove portion (17b) without accumulating in the vicinity of the peripheral edge (A). When cooling the molten resin (25, 25a), the temperature of the molten resin (25) filled in the groove (17b) decreases more quickly than the temperature of the molten resin (25a) in the mold cavity (19a), because the volume capacity of the groove portion (17b) is smaller than the volume capacity of the mold cavity (19a). As a result, the viscosity of the molten resin (25a) lying in the groove portion (17b) and in the vicinity of the peripheral edge (A) of the mold cavity (19a) is increased rapidly. Since the increased viscosity of the molten resin (25a) prevents a further volume of the molten resin (25) from flowing into the groove portion (17b) from the mold cavity (19a), the sheet-like material (5, 9) lying in the vicinity of the peripheral edge (A) comes to be covered by the resinous material (25, 25a) of diminished fluidity and protected against exposure to heat and/or pressure of the molten resin (25).
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