A gate structure of an injection mold is provided to cause efflorescence to be generated on a mold rib protruded from the injection mold, thereby eliminating a spraying process. A gate structure of an injection mold includes a mold rib and a gate(20'). The mold rib is protruded from the flat surface of the injection mold. The gate contacts with a part of the protruded mold rib. Therefore efflorescence(30') is generated on the mold rib and a spraying process for hiding efflorescence is omitted.
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