Unscrewing Closure Molds are designed for caps and closures with detailed threads which cannot be ejected using bump-off methods. When these parts are molded they must be unscrewed from the mold to avoid thread damage. StackTeck has developed proven designs for unscrewing molds with optimized cooling allowing short cycle times.
StackTeck has built a large number of unscrewing closure molds for high cavitations for a design that is decades old, including stack molds of up to 128 cavities. Our design is well proven to have excellent cooling while maintaining a good water seal on the rotating cores.
We have worked with a range of approaches including rotating stipper rings instead of cores on large mold programs and we have innovative patented approaches to actuate core rotation or to rotate cavities instead of cores. All of these patented alternatives for rotation can be custom tailored within the range of technologies that StackTeck offers to a particular application.
StackTeck’s benchmark solutions for Unscrewing Closures:
Servo Unscrewing Cap Mold Technology featured at K Show 2016
For more details on this Servo drive technology for molds, click here.