Extrusion International 3-2017

33 Extrusion International 3/2017 a mesh size of 3mm, 1700 kg/h powdered milk with a mesh size of 5 mm. Cyclone screening with ultrasonic assistance AZO cyclone screeners combine operationally safe tech- nology with high performance and easy maintenance and cleaning. The screeners can easily be integrated into existing systems thanks to their compact design. Safe products thanks to AZO cyclone screening tech- nology: complies with IFS and HACCP; automatic elimi- nation of foreign matter; clean and safe finished prod- uct. End-to-end HACCP concepts in the food and dairy indus- tries specify control screening and separation of metals as mandatory. This means any raw materials and semi- finished products are conveyed to the highly efficient, ultra-sensitive safety devices, such as metal receivers and control screeners, right upon delivery and in the produc- tion line immediately prior to filling into sacks, big bags or bulk tankers or silaging as semi-finished products. The networked control system notifies and logs inci- dents constantly at the critical checkpoints in the HACCP concept. Easy to clean cyclone screener type DA 650 with extraction device The patented cyclone screener type DA360 N with ap- plications including control and protective screening, fractionation, separation of foreign matter, breaking up lumps and aerating products, does not required an addi- tional dosing unit. This is why it has a low overall height and can thus be integrated into existing systems without any difficulties. Further advantages are easy opening of the machine without tools and the extraction and swiv- eling devices for the screen and the dosing screw, en- abling easy inspection and cleaning of the screen basket and the screw. Dead space in the machine is kept to a minimum, which further improves simplicity of cleaning. The screen basket can be replaced quite simply with a “quick change” screening system. The tried-and-tested, inexpensive cyclone screener type E is available both in painted version and in stainless steel Typical areas of application include: • control screening before and during processing to en- sure that no impurities, e.g. bag fibres, lumps and scraps of paper, get into production. • control screening together with a metal detector prior to filling and packaging to ensure that no foreign mat- ter remains in the finished product. • breaking up lumps and aeration of flours in the baking industry. • breaking up agglomerates that can occur in bagged goods or hygroscopic bulk solids. The lumps are carefully broken up without any loss of product. • separation of agglomerates following drying process- es. • screening out and returning fine particles, e.g. follow- ing granulation in the pharmaceuticals industry. • fractionation of bulk solids in powder form into assort- ed fractions according to particle size. AZO cyclone screening with ultrasonic assistance Sonic pulsing of the screen mesh can be used or fitted retroactively in the AZO type E, DA, FA and RA cyclone screeners. Key advantages: • Increase in screening capacity • Improvement in selectivity • Longer times between cleaning • Straightforward retrofitting in existing machines • Converter is outside the screener and hence outside the flow of powder. The use of ultrasound causes the stainless steel screen to vibrate at high frequency. These minute vibrations prevent near-size particles from sticking in the mesh of the screen fabric. The screen mesh stays clear for lon- ger, which in turn noticeably improves selectivity. This may result in an increase in screen capacity. The screen basket needs to be removed for cleaning far less of- ten and this significantly increases the useful life of the machine.