Method and apparatus for heating and conveying plastic preforms

Details Method and apparatus for heating and conveying plastic preforms Method and apparatus for heating and conveying plastic preforms

1990-03-14

1991-11-19

Yuen, Henry C.

Heating

Processes of heating or heater operation

Including preparing or arranging work for heating

432 10, 432224, F27D 500

Patent

active

050662228

ABSTRACT:
A process and apparatus for heating injected, cold preform blanks to blow molding temperature on a conveyor path wherein they are thereafter fed to a blow mold, the preform blanks being first heated to a temperature below the blow moulding temperature, then cooled and later reheated to a temperature slightly above the blow molding temperature, whereupon the preform blanks are allowed to equalize in temperature inside and out or are caused to do so by slightly cooling their outsides. The spacing on the holders on the conveyor chain, on which are mounted the preform blanks, is selectively adjustable to avoid heat radiation losses. The neck portions of the mounted preform blanks are surrounded completely by protective sheathings so that such neck portions are not heated while being conveyed to the blow mold.

REFERENCES:
patent: 3761550 (1973-09-01), Seefluth
patent: 4846656 (1989-07-01), Denis et al.
patent: 4923395 (1990-05-01), Coxhead et al.

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