| 摘要 |
PROBLEM TO BE SOLVED: To obtain a product having fine carved pattern on the bottom face positioning at the center of the bottom face, having agreed position relation of the shape of the body part and the carved pattern on the bottom face by boring small hole at the carved pattern part stamped on a bottom mold of a hollow glass product such as a glass cup, and vacuum-sucking the air from the hole. SOLUTION: A parison is molded by a roughcast by using a general-purpose automatic molding machine, and a mold is obtained by combining a bottom mold and finishing mold. The obtained parison is inserted into the obtained mold, and the parison is expanded by blown air to form the cup shape. Letters and the like are carved on the surface of the bottom mold, and small holes B are bored at the letter parts. When the parison is air-blown and molded, the glass is sucked from the vacuum holes B by carrying out the vacuum-sucking from a vacuum hole A opened on the side face of the bottom mold. The positioning of the bottom mold and the finishing mold is carried out by attaching an inserting plate C to the bottom face of the finishing mold in the case or the like requiring agree of molding shapes at the body part with the letter position.
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