| 摘要 |
A mold includes a parting surface, runners, mold cavities, gates and primary air-venting grooves defined in the parting surface. The gates connect the respective runners to the corresponding mold cavities. Each primary air-venting groove includes an air-receiving groove portion and an air-venting groove portion in communication with the air-receiving groove portion. The air-receiving groove portion communicates with the gate and surrounds the corresponding mold cavity. The air-venting groove portion extends to and terminates at a corresponding edge of the parting surface.
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