Fastest system in the world producing tamper-evident caps

With 190,000 caps/hour and 1.5 billion/year, German/Japanese injection moulding machinery supplier Sumitomo (SHI) Demag together with its partners, Total and Plastisud, says it has set a new world record in the production of HDPE caps with tamper-evident band without post-moulding operations.

Displayed at Chinaplas 2014, the El-Exis SP 420-3000 packaging machine produces 1.3 g HDPE screw caps on a 96-cavity hot-runner mould (29/25 design) with a production cycle of only 1.9 seconds. This machine is equipped with a 25:1 L/D ratio barrier screw and has been designed with a special backflow barrier aiming to improve reproducibility.

The fast cycle time results on one hand, from the combination of optimised mould dynamics by what SHI says is its unique independent hybrid clamp system and optimised injection and plasticising performances. On the other hand, this achievement has been made possible thanks to the close co-operation between packaging partners, including Total, who has contributed with their expertise in polyolefin resins for the caps & closures industry. Total's HD6081 (d = 0.960 g/cm³, MI2 = 8 g/10min) is dedicated to still water application and is said to be the "best" HDPE resin capable of achieving fastest crystallisation, thus reducing demoulding time between shots while giving optimised mechanical parts.

According to Arnaud Nomblot, Business Development Manager Packaging at SHI, “Total’s know-how in the field of materials for caps production has greatly contributed to this success. The material provides a vital contribution in terms of production efficiency. The technical breakthrough was made possible thanks to the excellent flow characteristics of the HD6081 material.”


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