Torque is the rotational force applied during cap application or removal from a alumiunm bottle. When applying a closure to a aluminum bottle it is important to utilize the correct amount of torque to ensure a proper seal. Ideally, torque should be evenly distributed throughout the closure.
Myth: The tighter you apply a closure the less likely the chance the product in the container is going to leak.
Fact: Applying too much pressure to a closure can actually increase the chances of product leakage.
Over-torquing may cause some points on the cap to have more pressure then others, which could result in an improper seal. If the cap is applied with too little torque, the container may leak or the closure could come off too easily. As a general rule, the amount of aluminum bottle torque is about half of the diameter of the cap.
As always, since packaging variables come into play, be sure to test your specific application to ensure optimal results and safety. The most accurate way to measure torque is with a torque tester. For more information or to purchase a torque tester, send us an email.