What’s said to be the first all-electric turning-stack mold technology will appear next month at the Fakuma 2012 show in Friedrichshafen, Germany. By removing the need for hydraulics, this development is aimed at users of all-electric injection machines, especially for food, medical, and pharmaceutical uses. Introduced by Foboha GmbH in Germany (U.S. office in Beverly, N.J.), the new turning stack uses electric servo motors for all mold movements, including ejectors.
A 4 x 8 + 8 electric turning-stack mold for producing a novel cap-sealing system for food or beverage bottles will be shown at Fakuma. The PP cap has a chamber for powdered additives, which are dispensed when the cap is opened for the first time. This permits safe storage of light-sensitive additives until the product is consumed. The cap has two parts and a lid for resealing the powder chamber. Eight upper and eight lower parts of the cap are injected in both parting lines of the cube mold from two injection units. The slide bars for demolding the outer thread and tamper-evident seal are on the nozzle side. After both parts are injected, the central block turns 90°. When the next injection cycle begins, the two parts of the caps are connected on both exposed sides of the cube, using removal units developed by Foboha that screw the parts together. Cycle time, including assembly, is only 7.5 sec, and no separate assembly machine is needed.