Patent ID: 6969482
Filing Date: 2005-11-29
Classification: B29C

Abstract:
1. A method for polychrome plastic material injection molding, comprising: a molding board provided with a plurality of cores and further the cores each provided with a plurality of cavities, the cores rotated for exchanging the position of the cavities and together with the rotation of the molding board, whereby permitting the injection of three different colored plastic materials into the cores respectively in turn, and then forming a triple colored plastic object; wherein the method for polychrome plastic material injection molding is a triple colored plastic material injection molding, a molding board provided with a first and second core respectively, alike, the cores are each provided with a pair of cavities, the method comprising the following steps: 1) Initial injection of the plastic material of first color: singly injecting the plastic material of first color into a cavity of the first core in the molding board based on the technology of plastic injection integral molding; 2) Rotation of the molding board: 180 degree rotating the molding board such that the first core and the second core exchanged in position, and then the cavities of the corresponding cores exchanged in position too; 3) Rotation of the first core: after the rotation of the molding board, then followed by a 180 degree rotation of the first core for exchanging the positions of the cavities of the first core; 4) Injection of the plastic material of the first and second color: injecting the plastic material of the first color into a cavity of the second core, while injecting the plastic material of the second color into a cavity of the first core; 5) Re-rotation of the molding board: further 180 degree rotating the molding board for exchanging the positions of the first and second cores, and then the cavities of the corresponding cores exchanged in position too; 6) Rotation of the second core: after the re-rotation of the molding board, the second core of the molding board being 180 degree rotated for exchanging the positions of the cavities of the second core; 7) Injection of the plastic materials of the first, second and the third color: injecting the plastic material of the first color into another cavity of the first core, the plastic material of the second color into a cavity of the second core, and the plastic material of the third color into a cavity of the first core, then the cavity of the first core in the molding board formed with a triple-color plastic object therein, while another cavity of the first core formed with a single colored plastic material, and the cavity of the second core formed with a double colored plastic material thereof; 8) Taking out the finished product: once the preceding steps are finished, then taking out the finished product; 9) Analogical production: after taking out the finished product, the molding board and the cores taking in form of the analogical states in given orders from the step 6 to 8, by such a manner, the triple different colored plastic material to be injected into the respective cores successively for cyclically forming and producing the triple colored plastic objects as needed.