| 摘要 |
PROBLEM TO BE SOLVED: To enhance the heating efficiency due to a heater and to reduce the radiation quantity from a valve gate housing while achieving energy saving. SOLUTION: This valve gate is constituted so that a pair of valve gate housings 1, 2 comprising cylindrical body parts 4 respectively having resin passages 3a and having heaters 5 respectively provided to the outer peripheral surfaces thereof are parallelly arranged in close vicinity to each other in such a state that the resin passages 3a are allowed to communicate with one cavity K of an injection mold and a heat insulating part D is provided between the body parts 4 of the housings 1, 2. Even if the capacity of the cavity K is large, the housings 1, 2 can be reduced in diameter and the heaters 5 can be miniaturized and the heating efficiency due to the heaters 5 is enhanced. Since the heat insulating part D is provided between the body parts 4 of the housings 1, 2, the heat between the main body parts by the heaters is hardly transferred to the cavity K and the solidification failure of the molten resin in the cavity K is not generated.
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