| Technical Papers Threaded Lid - Injection Mold Release
Until TGM’s novel yet simple approach to eject threaded lids, mold makers would design tooling which rotated the outer core ring (where the threads are located) in order to push or remove the lid from the core. Using primarily a hydraulic motor, the core ring would spin upon the mold opening around the core itself, using the natural pitch of the threads to eject the lid. This was an accepted method, which often yielded less than satisfactory results.
The problem with threaded lid molds is that if we are turning the outer core ring, how do we efficiently and reliably provide superior cooling in this area? Traditional designs (rotating core ring), bring water up through the core similar to conventional lid molds, and using large diameter O-rings between the core to rotating core ring, seal the water channels, that transfer the water into the core ring. The issue with such a system is there is an absorbent amount of rotating friction on the large diameter O-rings between the core and rotating core ring, resulting in fast wear of these seals, thus causing premature leaks and unreliable cooling.
Realizing this problem as an opportunity, TGM has developed a novel invention which not only easily de-molds threaded lids it provides the same exceptional cooling characteristics which can be found in a traditional TGM snap down lid mold. | |
