Method of and apparatus for making a parison
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United States of America Patent
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May 21, 1985
Grant Date -
N/A
app pub date -
Aug 24, 1983
filing date -
Aug 31, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A parison is molded from a gob of molten glass by first increasing the volume of the interior of a cup-shaped main mold body by an extra volume. Then the molten-glass gob is inserted through an upper opening into the interior of the main mold body. A neck mold comprising a split neck ring is closed on the main mold body so that the neck mold and the main mold body together define a mold cavity partly formed by the interior of the main mold body. A plunger is inserted through the neck mold down into the gob in the mold cavity to displace molten glass and shape the gob into a parison. The extra volume of the interior of the main mold body is then decreased to zero at the latest until the time at which the parison is finished, so that the molten glass rises in the mold cavity up to a level above the top of the main mold body. Finally the parison thus formed is demolded. It is therefore possible to put a relatively large gob in the main mold body without any possibility of it overflowing, and the mold cavity can be shaped more like the finished hollow glass article, so that the resultant parison can be blown into a higher-quality product.
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