With two production cells for the packaging and medical sectors, Sumitomo (SHI) Demag Plastics Machinery GmbH, Schwaig/Germany and its Chinese daughter company Demag Plastics Machinery (Ningbo) Co., Ltd. will be present this year from 23 to 26 April 2014 at the Chinaplas in Shanghai. With the help of the hybrid high-performance El-Exis SP and the hydraulic all-round machine Systec C, the manufacturers will be presenting two examples of injection moulding machines on their Stand E3J01 in Hall E3.With the El-Exis SP, Sumitomo (SHI) Demag has meanwhile set the standard in packaging injection moulding, with regard to dynamics, speed and durability. This machine can perform the fastest process and injection movements with high precision and safety - during the production of standard caps, as well as thin-walled and packaging parts with minimum tolerances, as well as precision applications with high injection pressures. The El-Exis SP is offered with a clamping force range of 1,500 to 7,500 kN. One example of the high dynamics of the machine: In the specification with the 2,500 kN clamping force, the El-Exis SP accelerates to a screw advance speed of 800 mm/s in around 25 ms.
The performance will be demonstrated on the Chinaplas 2014 with the production of PE-HD screw caps using an El-Exis SP 420-3000 (clamping force 4,200 kN). For this, a 96-fold hot runner mould is used for the 1.2 g light 28 mm caps with tamper-evident protection for still mineral water. A barrier screw with an L/D ratio of 25:1 delivers the necessary dosing capacity with sufficient reserves; a special backflow barrier ensures process safety and high reproducibility. With the hybrid drive technology, with activeAdjust optimised movement of all axles and the further developed machine control NC5 plus; this cap production already achieved a cycle time of approx. 2 s. at its premier at the K-Messe 2013 in Dusseldorf. The application has been further optimised since then, and at Chinaplas achieved yet another cycle time reduction of around 10 %.
