Reheating of preforms with radio frequency energy

Details Reheating of preforms with radio frequency energy Reheating of preforms with radio frequency energy

B - Operations, Transporting

29

C

18/538

B29C 49/64 (2006.01) B29C 35/08 (2006.01) B29C 35/12 (2006.01) B29C 49/06 (2006.01)

Patent

CA 1235266

REHEATING OF PREFORMS WITH RADIO FREQUENCY ENERGY ABSTRACT OF THE DISCLOSURE This relates to the discovery that when polymer preforms are reheated in the forming of polymer bottles by blow molding techniques, if the reheating is effected by the use of RF energy, there will be a heating of the interior wall portion of the preform to a higher tempera- ture than that of the exterior wall portion, with the result that, due to the requirement of greater stretching of the interior preform wall portion, a more effective stretching of the heated preform during the blow molding thereof occurs with a highly beneficial result including a more controlled stretching of the polymer and a material reduction of the recently discovered chain scission and laminating effect which exists in like bottles formed of like preforms using present commercial heating methods. The differential temperature gradient resulting from RF heating has particularly beneficial results when the polymer is PET.

423122

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