When designing a pressurized closure, safety and sealing are of equal importance. Stress Engineering has the background in design, predictive analysis, and materials to help you design safe, functional pressurized closure systems.
Although many of the same principles apply from conventional closure design technology, sealing a pressurized container can be much more demanding. Internal pressure introduces deformations that typically disable the sealing system. Very small changes to the design can have a significant impact on the effectiveness of the seal. This is where our predictive analysis technology shines. Design iterations can be implemented in the virtual environment of the computer, taking into account material creep and relaxation, enabling understanding and optimization without the need to build the closure, only to find it does not deliver the anticipated performance.
In addition to the challenges of sealing in a pressurized system, venting the package during closure removal must be balanced with the degree of thread engagement. During this process, thread engagement ensures that the cap will not be ejected from the neck finish (called "missiling") and pose a safety hazard to the consumer.
Equally important, vents must be sized adequately to enable pressure balancing to occur in a safe manner. Stress Engineering has developed a mathematical systems model to help clients better understand the relationship between vent-down, closure/finish friction and design.