Oddly under the radar at Chinaplas 2014 (Shanghai, April 23-26) was the demonstration by Sumitomo (SHI) Demag of a molding cell producing 190,000 bottle caps per hour in what was described as a new world record.
The El-Exis SP 420-3000 packaging machine produced 1.3 gram screw caps on a 96-cavity hot-runner mold (29/25 design) with a production cycle of only 1.9 seconds. The press was equipped with a 25:1 L/D ratio barrier screw and was designed with a special backflow barrier targeting better reproducibility.
Company officials said in a press release that the fast cycle time results from the combination of optimized mold dynamics using a proprietary, independent hybrid clamp system and optimized injection and plasticizing systems.
Credit was given to close cooperation between SHI’s five partners: Total for a resin optimized for the fastest possible crystallization and flow time; Plastisud, a high-tech French mold-maker; SISE, a French pioneer in valve gate controls; IMDvista, a Swiss producer of high-speed vision inspection systems; and Eisbär Trockentechnik, an Austrian manufacturer of dryers and mold dehumidification systems.
The demonstration, while announced before the show by SHI, finally got some press notice in the last few days due to a Total press release.