Packaging Division: Machine series for direct PET processing completed

Modified planetary section for the degassing of PET
After the new single-screw extruder concept for manufacturing high-grade A-Pet film was presented for the first time at the K three years ago, the interest of the market for cost-efficient direct extrusion processes has continued unabated. Therefore the Packaging Division of battenfeld-cincinnati, Bad Oeynhausen/Vienna has extended its film extrusion product portfolio and is now presenting a complete machine series with three different models for the medium output range between 600 and 1,200 kg/h at the K this autumn.

The new models 1-90-34 D/V PWE, 1-120-34 D/V PWE and 1-150-34 D/V PWE will be immediately available for direct PET extrusion without pre-drying or pre-conditioning. The special feature of this processing equipment is the combination of a normal single screw with a modified planetary section. In the processing unit, the plastic material is melted in the first single-screw section, then degassed in the subsequent planetary section and finally transported to the die by the second single-screw section, where the necessary pressure is built up. The advantages of the planetary section, i.e. short, precisely calculated dwell times, an intensive self-purification process and continuous surface renewal, have been achieved by its special structural design: several planetary spindles with matching tooth gears revolving round a motor-powered central spindle with evolvent gears. This concept ensures a large total melt surface and consequently optimal conditions for degassing. With these special extruders, it is therefore possible to process both virgin materials and purified postconsumer flakes without any problems with an entry moisture content of up to 1,000 ppm, with a film output of optimal quality.

With this new machine series, the Packaging Division headed by Dr. Henning Stieglitz has responded to the market demand for cost-efficient machinery with a high degree of flexibility. More and more processors are following a decentralization strategy in their production, aiming to produce film at several locations to meet regional demand. Therefore the manufacturing equipment must be flexible and capable of processing PET as well as PP. In 2009, these two materials already had a market share of 50% of the total material consumption of some 2 million tons in the production of thermoformed food packaging film. Experts expect that especially the significance of PET in its various different modifications will continue to increase in future.

Apart from the flexibility which this new machine series offers precisely for this growth market, it also features low life cycle costs (total cost of ownership = TCO). This means that the investment is more than compensated for by extremely low operating and maintenance expenses.