Patent ID: 7753221
Filing Date: 2010-07-13
Classification: B29B,B29C,B29L,B65D

Abstract:
1. A blow-molded container comprising: a cylindrical body; a neck disposed in the upper portion of said body; and a bottom disposed in the lower portion of said body, wherein said container is formed by a direct blow molding process using a split mold, which has a mold parting face perpendicular to the mold-clamping direction and splits into front and rear mold halves, and in which a blow ratio in the range of 1 to 3 is set in the direction of mold parting lines formed by said mold parting face in a plan view showing a body portion above said bottom, wherein each of said front and rear mold halves include a semi-columnar bottom block, said semi-columnar bottom block being disposed inside each of said respective front and rear mold halves and having a top surface, said top surface forming said bottom, said bottom and said cylindrical body forming a semi-circular bottom edge line, wherein a bottom parting line is formed on an underside surface of said bottom by a linear pinch-off line, which is formed by pinch-off blades disposed at pinch-off section of said split mold, a pair of said mold parting lines formed on the right and left sides of a peripheral zone, and a pair of connecting lines that connect the right and left ends of said pinch-off line to inner ends of said right and left mold parting lines, wherein said connecting lines adjacent to said pinch-off line are formed by end parting faces located at right and left ends of the pinch-off section of said split mold so that a pair of substantially right-angled bent corners is formed by said connecting lines and said pinch-off line and said pair of connecting lines formed along said semi-circular bottom edge line, wherein said split mold forms flash lines on the underside surface of said bottom that extend only from the center of the underside surface to said bent corners, wherein the pinch-off line linearly extends across a diameter and passes the center of the underside surface of the bottom, the pinch-off line being angularly offset by an angle α from the direction of the mold parting lines, wherein the connecting lines are formed by connecting substantially linearly the right and left ends of said pinch-off line with the inner ends of respective right and left mold parting lines, the connecting lines being substantially perpendicular to the mold parting lines, and wherein the bottom parting line is formed substantially axisymmetrically around the center of said underside surface.