Producing Hot-Fill PE Bottles

This improvement in PE’s properties, thanks to "After Crystallization", is utilized in order to produce Hot-Fill PE Bottle(KEXON). The performs are here, in contrast to the standard stretch blow molding process, not blown into a cold mould, but into one heated up to as much as 160°C.

To enable the bottles to be removed from the hot moulds however, they have to be cooled. For this purpose, compressed air is blown through bores in the tubular-shaped Stretching Rod, which cools the bottle from the inside known as a flushing-air process.

The heating time for the preforms is longer, since hot-fill PE bottles are always manufactured from heavy preforms, so as to obtain increased stability.

In the heat-set process, the bottle’s characteristics depend even more closely on the process settings and the choice of preform than is the case in the standard process. In particular, the temperature of the product during filling and the time during which this temperature has to be maintained, are crucial factors. The higher the thermal stress, the higher the degree of crystallinity required. In order to obtain a very high degree of crystallinity, a long crystallization time in the blowing mold is needed. Consequently, the more crystallinity is required, the lower the station’s output will be.

PE container for Hot Filled Applications

The container's body side wall is rigidized against radical and longitudinal vacuum distribution so that paper labels can be applied to the container. In addition, the amorphous threaded mouth of the container is rigidized by gussets molded into the container at the junction of the mouth and body portion of the container to resist deformation when the container is capped. Finally, a bulbous vacuum deformation area in the container is provided adjacent the container mouth.

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