Abstract: The present invention relates to a thermoplastic resin substrate for a curved mirror and a method for preparing the same, and a curved mirror and a head-up display comprising the thermoplastic resin substrate. The preparation method comprises the following steps: A) heating up a mold of an injection molding machine to a temperature in a range of 130-190° C. and closing the mold, B) injecting a molten thermoplastic resin into the cavity of the mold cavity, C) applying a pressure of 300-700 bar to the cavity for a period of 5 or more seconds, D) stopping applying pressure and cooling the mold to a temperature in a range of 60-100° C. within 10-50 seconds, and E) opening the mold and taking out the molded thermoplastic resin substrate, wherein a gap of 0.3-1 mm is left between the parting surfaces of the cavity of the mold prior to applying the pressure to the cavity. The thermoplastic resin substrate according to the present invention features a large size, high dimensional stability, and low surface roughness.

Abstract: The present invention relates to a method for producing a decorative part for vehicle interior trim, which is characterized by comprising the following steps: I) a softened decorative film is adhered to an inner surface of a decorative part mold and molded into a decorative film having the shape of a decorative part, wherein the decorative film has a thickness of at least 0.2 mm; II) scrap edges of the decorative film having the shape of the decorative part are removed; III) the decorative film having the shape of the decorative part from which the scrap edges have been removed is placed again in the decorative part mold and adhered to the inner surface of the decorative part mold; and IV) a body material of the decorative part is injected into the decorative part mold by a physical foaming injection molding process and molded into the decorative part together with the decorative film.