METHOD AND DEVICE FOR THE PRODUCTION OF A PLASTIC PREFORM
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United States of America Patent
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Issued Date -
Sep 13, 2007
app pub date -
May 10, 2005
filing date -
May 11, 2004
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a process for manufacturing a preform from a semicrystalline amorphous polymer at a slow rate of crystallization, in which: the said polymer is plasticized at (3) by rapidly raising its temperature to a temperature below the melting point; the said plasticized polymer is pressed through a die (4); on leaving the die, the said polymer is swept by a hot dry inert gas (11); the plasticized polymer is received in a first container (6), while keeping the polymer at the same temperature as the plasticizing temperature in all the steps; and a die pressing step (13) is carried out in the said first container or in a second container, transferred from the first, with sudden cooling so as to obtain the preform in an amorphous state.
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