局部加热源向心地加热垂直的玻璃预成型体，同时用压缩空气吹制加热的玻璃以使其膨胀。

A localized heat source centripetally heats a vertical glass pre-form, while a pressurized air source blows the heated glass to expansion.

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空气轴承可以向心地对着膨胀的预成型体吹出空气以限制膨胀和阻止预成型体和局部加热源相接触。

An air bearing may centripetally blow air against the expanding pre-form to limit expansion and prevent contact of the pre-form with the localized heat source.

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