Method for controlling the temperature of a layer in contact with a plastic material
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United States of America Patent
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Aug 10, 1993
Grant Date -
N/A
app pub date -
Sep 22, 1989
filing date -
Sep 22, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for thermically processing a material, such as a plastic material made of PET, in contact with a very thin heating layer that is provided on a body, such as a blow-mold. The intensity of current supplied to the heating layer is controlled as a function of the medium temperature in the heating layer to allow the heating layer to very rapidly heat up the plastic material contacting the heating layer. After switching off the heating current the plastic material is rapidly cooled down to the temperature of the body carrying the heating layer. This process may be applied to the heat setting process of blow-molded hollow articles made of PET.
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