Method and apparatus of controlling temperature of injection preform for stretch blow molding
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United States of America Patent
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Aug 24, 1999
Grant Date -
N/A
app pub date -
Dec 15, 1997
filing date -
Dec 19, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A preform heating method for heating a preform for a stretch blow molding is executed by an apparatus which comprises an outer heating die having a cavity for the preform, a thermal-insulating pot surrounding the outer heating die and a high-frequency heating unit installed around to the thermal-insulating pot. The heating of the preformed is executed by locating the heating die around the preform, applying alternating magnetic flux to the heating die to heat the preform through the heating die, and controlling the magnitude of the alternating magnetic flux to control the temperature of the preform.
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