Method of reheating preforms for forming blow molded hot fillabl

Details Method of reheating preforms for forming blow molded hot fillabl Method of reheating preforms for forming blow molded hot fillabl

1986-06-24

1988-03-15

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1047, 219 1055R, 219 1053, 264 25, 264 26, 264DIG46, 432 11, H05B 660

Patent

active

047315130

ABSTRACT:
A hybrid reheating of polyester preforms which are to be stretch blown into containers wherein the reheating coupled with the controlled quick initiation of the blow stretch operation after final reheating produces a container which may be filled with a hot fill without there being any disadvantageous shrinkage of the container. The reheating is by way of a specific combination of quartz oven reheating and radio frequency reheating together with specific equilibrations of the temperature cross sectionally of the preform body. Polyester preforms may be reheated to a cross sectional center temperature ranging from 225.degree. F. to 260.degree. F. and stretch blow molded without undesirable surface crystallization occuring while the ability of the container to be filled with a hot filled substantially without shrinkage is increased.

REFERENCES:
patent: 4079104 (1978-03-01), Dickson et al.
patent: 4396816 (1983-08-01), Krishnakumar et al.
patent: 4407651 (1983-10-01), Beck et al.

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