Published on the Packaging World Web site

Materials Product Brief
| August 31, 2003

Extreme temperature closures

Alcoa introduces 2 new closures designed to improve the seal integrity of carbonated beverage packaging under extreme temperature “cycling” conditions: the 28-mm Double-Lok XT™ (left) and 28-mm Extra-Lok XT™ (below).
 By ,

Wide-ranging temperature conditions can cause shrinkage of the heat-sensitive PET material which can cause gaps to develop between the finish and the closure. The XT liner design incorporated an inner and outer seal providing maximum protection against gaps.

SOURCE: http://www.packworld.com/package-component/closures/extreme-temperature-closures