| 摘要 |
PURPOSE:To carry out thick wall molding without applying excessive injection pressure and dwelling pressure and make the appearance of a molded product pretty by kneading and dispersing a foaming agent for which required temperature and required retaining time are selected or adjusted for the purpose of generating foaming reaction with molten resin. CONSTITUTION:A foaming agent for which required temperature and required retaining time are selected or adjusted for the purpose of foaming reaction occurring is injected into a mold in the state of being kneaded and dispersed with molten resin in a manner to be mixed into molten resin with foaming reaction occurring in a heating cylinder during plasticizing, not foamed in the molten resin temperature of a fast cooling speed in a mold after being injected into the mold and foamed at the molten resin temperature of slow cooling speed, and molded by providing the difference of foaming reaction generated by the difference of cooling speeds of the molten resin in the mold. As the surface is not foamed and solidified in the process, a beautiful appearance can be and as the same is not foamed during and just after filling, even a thin wall section can be molded. |
