MOLD FOR INJECTION MOLDING AND INJECTION MOLDING METHOD

摘要

Provided are a mold for injection molding and an injection molding method that can limit the intrusion, into cavities, of a gas that is present in the gap between the main body and the peripheral part of a mold with a divided structure and the generation of air pockets in the molding. Because an air hole (82) that communicates with a gap (GA) between a core (72) that is the main body of the mold and a peripheral part (73) is provided, gas present in the gap (GA) between the core (72) and the peripheral part (73) can be discharged to the outside by reducing the pressure of the air hole (82) from the opposite side of the gap (GA). In other words, because the intrusion of a gas present in the gap (GA) between the core (62) and the peripheral part (73) into a molding space (CV) can be prevented when the pressure inside the molding space (CV) is reduced via a pressure-reducing path (81) as preparation for injecting a melted resin into the molding space (CV) to fill the molding space (CV), the inclusion of gas in the molding product (MP) particularly in the parts of the product corresponding to the molding space (CV) and causing air pockets can be reliably prevented.