| 摘要 |
An improved method is disclosed for forming glass bottles by the blow and blow process. A parison mold having a one-piece annular blank mold section and split neck and shoulder mold sections is charged fully with molten glass. Air is subsequently blown through a manifold covering the upper end of the parison mold to force the molten glass into an annular space defined by a cavity in the neck mold section and a neck pin projected into the neck mold cavity. The neck pin is then reciprocated from the neck mold cavity, and air is blown through the molded neck to cause the molten glass to chill its surface by pressure contact with the inside of an upright truncated pyramidal-shaped cavity formed in the blank mold section. The glass which comes into contact with the cavity walls in the blank mold section develops a very uniform enamel due to the uniform cooling achieved with the solid annular blank mold section. The blank mold section is separated from the neck and shoulder mold sections which support the molded parison and the parison is expanded by blowing through the molded neck to stretch the enamel of the glass surface into a balloon shape. The expanded parison is inverted and inserted into a cavity in a split blow mold. The parison is then allowed to sag in the blow mold cavity as the enamel of the parison is reheated through conduction of heat from the hotter glass on the inside of the parison. After the parison sags a predetermined amount, the parison is expanded to fill the blow mold cavity and is held until the glass has chilled sufficiently to maintain its shape when removed from the blow mold.
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