Heating – Processes of heating or heater operation – Treating an article – container – batch or body as a unit
Patent
1984-09-20
1986-02-18
Silbaugh, Jan
Heating
Processes of heating or heater operation
Treating an article, container, batch or body as a unit
264520, 264521, 264532, 264535, 425526, 432 11, F27B 912, B29C 1707
Patent
active
045711739
ABSTRACT:
A method is disclosed for thermally conditioning an essentially tubular parison of polyethylene terephthalate material to a desired orientation temperature at which the polyethylene terephthalate material can be biaxially stretched. The method comprises the steps of heating the parison by applying heat to the exterior surface thereof until the surface reaches a maximum heating temperature less than the temperature at which the polyethylene terephthalate material begins to crystalize and then cooling the heated exterior surface of the parison to remove the heat therefrom while the heat within the wall of the parison diffuses therethrough to raise the temperature of the opposing interior surface toward the desired orientation temperature. The method further includes the subsequent steps of reheating the parison by applying heat to the cooled exterior surface thereof until the surface reaches a temperature no higher than the maximum heating temperature to again add heat within the wall of the parison and then recooling the reheated exterior surface of the parison to again remove the heat therefrom until the additional heat within the wall of the parison diffuses therethrough to further raise the temperature of the opposing interior surface to approximately the desired orientation temperature so that the temperature through the wall of the parison is substantially uniform from the reheated exterior surface to the opposing interior surface.
REFERENCES:
patent: 3445096 (1969-05-01), Seefluth
patent: 4025294 (1977-05-01), Daane et al.
patent: 4036927 (1977-07-01), Stolki
patent: 4382905 (1983-05-01), Valyi
patent: 4407651 (1983-10-01), Beck et al.
Chang Long F.
Steele Scott W.
Owens--Illinois, Inc.
Rice Philip M.
Silbaugh Jan
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