Patent ID: 7604767
Filing Date: 2009-10-20
Classification: B29C,B29K,B29L

Abstract:
1. A side gate type injection molding die comprising: a product portion being a space for molding; and a side gate being used to inject a material into the product portion; wherein the side gate is formed so as to have a rectangular transverse cross section in a contact part between the product portion and the side gate; wherein the side gate is formed so as to extend from the contact part in the direction perpendicular to the transverse cross section of the contact part, at least one of corner parts of the transverse cross section formed into a rectangular shape in the contact part of the side gate is formed in a curved shape, and the resin material to which a brightening agent is added is injected into the product portion from the side gate to manufacture a molded component; and wherein the side gate is formed so that when the radius of curvature of the curved shape is taken as R, the gate height of the transverse cross section as h, and the gate width thereof as w, the relationship between the gate height h and the gate width w is h≦w, the ratio of the radius of curvature R to the gate height h is 0.25≦R/h≦0.75, and furthermore, the ratio of the transverse cross-sectional area to the transverse cross-sectional area in the case in which the curved shape is not provided in the corner part is not lower than 90%.