Temperature-conditioning molded preforms

Details Temperature-conditioning molded preforms Temperature-conditioning molded preforms

B - Operations, Transporting

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C

18/540

B29C 49/64 (2006.01) B29C 49/04 (2006.01)

Patent

CA 1065563

LETTERS PATENT FOR IMPROVEMENTS IN TEMPERATURE-CONDITIONING MOLDED PREFORMS ABSTRACT OF THE DISCLOSURE In a process of forming a molecularyl oriented plastic bottle from a just-molded preform still at elevated temperature which involves extracting heat from the preform in a temperature- conditioning chamber to bring it to molecular orientation temp- erature prior to distending it into the shape of the bottle, uniformity of material distribution in the bottle is improved by affirmatively applying heat to a vertical region of the preform body below a molded finish while continuing to extract heat from the remainder of the body thereby establishing a gradient along the length of between about 1.5 to 11°C prior to remolding, such body with the temperature gradient extant therein still being within the molecular orientation temperature range. Inventor: Geoffrey A. Long

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