| 摘要 |
PURPOSE: An injection mold structure of a cap having an undercut is provided to prevent the loosing of a cap caused by external impact. CONSTITUTION: An injection mold structure of a cap having an undercut comprises first to fifth blocks(110, 120, 130, 140, 150), a center key(160), and a spring(170). The blocks are coupled successively. A first forming block is coupled with a first block and comprises a nozzle(112). A guide block(121) is installed in the inner surface of the second blocks. A second forming block(131) is formed in the inner surface of the third block. The second forming block supports a cap. The center key penetrates through the center of the fifth block. |
