| 摘要 |
PURPOSE:To form a specified minimum-diameter part at a specified position in a bottle neck by providing a projecting line for regulating the minimum- diameter part to the guide plate of a neck forming die, and embedding the projecting line in the bottle neck when molding is carried out. CONSTITUTION:The glass bottle neck is molded by a primary blowing using a rough die 10. The glass product after the primary blowing (parison) is reversed, transferred to finishing die, and molded into the final product by a secondary blowing. The projecting line 21 for regulating the minimum-diameter part in the bottle neck is provided on the guide plate 20 of the neck forming die. The projecting line 21 is formed at on HI position having a specified length away from the recessed part 23 of the guiding plate 20 corresponding to the top plane of the bottle neck 41 with the specified diameter 11 of the minimum- diameter part. The guiding plate 20 provided with the projecting line 21 is inserted into the bottle neck, molding is carried out, and the desired minimum- diameter part 42 is formed in the glass bottle neck.
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