Method and apparatus for heating lengths of thermoplastic material
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United States of America Patent
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Mar 16, 1982
Grant Date -
N/A
app pub date -
Dec 8, 1980
filing date -
Dec 8, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The method and apparatus disclosed herein provide a stratified heat bath for use in the heating stage of thermoplastic deformation. It allows for heating of central sections of the thermoplastic lengths in order to render said lengths susceptible to deformation without heating the end sections or tangents of said lengths, permitting the ends to retain their original shape. In the case of tubular lengths, such as lengths of PVC pipe, the invention provides for more rapid heating than in the prior art.
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