05/25/2012

www.gupta-verlag.de/thermoplastic-elastomers

Arburg

[image_0]With the servo-electrically driven twin-screw Injester, an extremely broad range of high-viscosity and paste-like compounds can be processed. This also includes solid silicone (HTC), which, like liquid silicone, places high demands on material preparation. In order to ensure a high level of process reliability and part quality during HTV processing, the material must be supplied continuously, free of bubbles and at a constant pressure. With its newly-developed twin-screw Injester, Arburg consequently uses two servo-electrically driven screws to continuously feed the material at a pressure-regulated, even and gentle rate to the injection unit. Refilling is also possible with ease during the running process.  Processing of a wide range of materials
Thanks to the liquid temperature control, the continuously programmable servo drive and pressure-regulated material feed, the twin-screw Injester can be used for a wide range of applications: sensitive materials can be cooled and high-viscosity materials can be heated to improve processability. In the case of single-component silicone, the material used is often not standard, but produced on an individual basis according to the product requirements. As well as representing a challenge in processing terms, this also results in frequent material changes.  Short set-up and downtimes
One advantage of the twin-screw Injester is that it is very quick and easy to clean. The significantly shorter setup and downtimes, in conjunction with the high process reliability, ultimately lead to a high level of cost-efficiency in production during day-to-day use.  Electric Allrounder 570 with special silicone equipment package
The DKT exhibit is an electric Allrounder 570 A with a clamping force of 1,500 kN and a size 400 injection unit. This forms part of the unique silicone equipment package from the modular Arburg range and features a special screw geometry, cylinder temperature control and nozzle technology. Furthermore, it has 12 adaptive and optimally expandable mould heating circuits for either vacuum, air blast, brush or demoulding devices, water-flow monitoring as well as various expansions for the Selogica control system, e.g. for temperature-dependent post cooling or for mould closing at a specified temperature. This equipment package, which is precisely adapted to the processing of solid silicones, makes the Allrounder in conjunction with the twin-screw Injester into a compact and cost-effective injection moulding solution for processing of HTCs.

www.gupta-verlag.de/thermoplastic-elastomers