ABSTRACT
The smallest part of a package, and often the most critical, is usually the closure. The security of the whole assembly and the integrity of the contents are dependent upon the cap, fastener, or adhesive that is used to complete the package. Not only must the closure remain intact throughout the hazards of assembly, storage, handling, and shipping, but it also must be easy to open and reclose when it reaches the consumer. There is often a very narrow line between a closure that is easy to use and strong enough to travel, and one that fails in shipment or is nearly impossible for the average person to open.
