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5.5 Invert and Reheat

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After forming of the parison, the blank‐mold opens and the parison is transferred via an invert to the blow‐side. The invert consists of an invert‐arm in which the finish equipment with neck‐ring and guide‐ring is fixed. As soon as the blank‐mold opens and invert takes place, the so‐called reheat starts. During the blank‐side process, the glass‐surface has been cooled down, especially through the contact with the molds and blowing air. The glass viscosity rises in this way, which is necessary to give the parison a certain rigidity to move it without deformation. After having been released from the blank‐mold, the outer parts of the parison get reheated from the hotter inner part through thermal conduction, which is in fact needed to lower again surface viscosity before the last forming step that will give the container its final shape.

Encyclopedia of Glass Science, Technology, History, and Culture

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