TECHNICAL DESCRIPTION
The original processing plant consisted of a bag ripper, drum screen, air classifier and a sorting machine. The old system could sort a maximum of two tons per hour and the material was then pressed into bales and sold. This entailed a high demand for personnel in the manual sorting cabins, which had to be optimised. The conversion currently underway necessitated a renewal of the bag ripper, which had a positive effect on the processing of the feed material coming from the Viennese and Lower Austrian regions (yellow bag). The new plant allows for greatly improved and more consistent feed. This, in turn, increases throughput and improves sorting results. The built-in drum screen was kept and continues to separate the material into three fractions: fine, medium and coarse material. The fine material (0-50 mm) is fed directly into a container, where it is then sent off for thermal utilisation. Coarse material (> 250 mm), which consists almost exclusively of films, is conveyed into a separate system area and manually resorted. The medium fraction (50-250 mm) is processed further and passes through a ferrous metal separator to the air classifier, where the material is freed from foils and light materials. After that, it is conveyed to the first 3-way sorting machine (REDWAVE NIR 2000). There, PET and HDPE are positively ejected by means of pressurised air in the first step and TETRA in a second step. The TETRA sorting process is thus complete and this material remains in a box. The flow of the remaining plastic material stream is scanned by the non-ferrous metal separator underneath in order to obtain non-ferrous fractions. In the subsequent sorting cabin, the recovered non-ferrous goes through quality control in order to produce pure, high-quality aluminium (e.g. used for beverage cans). The PET and HDPE fraction then reaches the REDWAVE 2i – the new generation of sorting machines – and is processed via two channels into five pure plastic fractions by this 3-way sorting machine: HDPE, blue PET, green PET, transparent PET, and mixed PET. The sorted fractions reach the bunkers underneath via a final quality control in the sorting cabin. Later, this is then manually fed onto the press loading conveyor, which then feeds the existing bale press.
HIGHLIGHTS
The first intelligent new generation of REDWAVE 2i was installed at Nemetz in early March. This machine operates with the Sensor Fusion Technology which combines near-infrared, RGB and metal sensors for optimum sorting quality. When compared with conventional sorting machines, REDWAVE 2i provides essential advantages: The space-optimised and economical design of the machine enables simple and fast integration into the system according to the principle “Place – Connect – Start “, which saves installation time. All components such as the electrical system, the entire wiring and the control cabinet are integrated into the machine housing. In the future, Nemetz employees will benefit from the easy and convenient accessibility of the machine, which will make periodic cleaning and maintenance work much easier for them through the new design and additional functions.
