TECHNOLOGY | WASHING
Right: Product Manager Andrej Gustin (left) and Plant Manager Jure Jambrovic (right) at Slovenian recycler Dinos
system control and its numerous setting options to cover a wide range of materials, such as hard plastics and films. The internal repressor ensures smooth input of the feed material to the cutting unit for continuous shredding. The precisely adjustable cutting gap ensures a homogeneous grain with a low fines content. “For years the Micromat 2000 has proven itself as an important core component of our washing systems,” says Harald Hoffmann, Managing Director of Lindner Washtech. “We are constantly optimis- ing the machine to ensure a homogeneous recyclate, which is an important prerequisite for the downstream process chain and contributes to the extreme reliability of the entire system.” The Floater extend pre-washing system is a newly developed addition to the Lindner Washtech range, which optimises the separation of contami- nants from the plastics fractions before washing. In contrast to the float-sink method, materials with a specific weight greater than 1 can also be added to the washing process by means of a slide system. For example, this prevents valuable films with adhering dirt particles or plastics with mineral fillers, such as calcium carbonate or talc, from being discharged along with the foreign matter. The floater is made entirely of stainless steel. The separation area has a size of 2,200 × 1,250 mm. The material is discharged and transported by two discharge screw conveyers, each with a drive power of 4.0 kW. Dinos uses the Loop Dryer for mechanical
Below: The film recycling plant at Dinos
drying of the shredded and washed plastic flakes. In the Loop Dryer any particles adhering to the material, such as paper fibres, are detached using controlled centrifugal force and the materials are dried. This powerful dryer has a total weight of around 8.7 tonnes. The rotor diameter is approxi- mately 1,500 mm with a rotor length of 3,000 mm. The centrifugal force resulting from this rotor radius
and the large screen surface ensure high efficiency of the facility, making it possible to dry hard plastics, such as HDPE and PP, to less than 3% residual moisture in a single drying step. After mechanical drying, the film fractions are transport- ed by means of a blower to a thermal drying stage before the material is fed into the extruder. Dinos also uses Erema’s Interema TVEplus
extruder system in RegrindPro design with laser filter, which can process everything from LDPE film fractions to HDPE and PP granulate. The machine can process plastic granulate of all densities, due to its wide input bulk density range of 30-800 g/l. Feeding is automatic and the input material is slowly and homogeneously heated in the precon- ditioning unit, ensuring highly effective drying and degassing of the filtered melt. Dwell time of the granulate is one hour. Hot air flows through the material and any volatile molecules are removed. This results in significant odour reduction in an early stage of processing, which ultimately widens the scope of applications for the regranulate. The extruder is filled continuously with hot material and a universal direct-drive extruder screw makes it possible to switch between different types of regranulate without changing parts. In the next step, a laser filter with a filtration fineness of up to 70 µm removes non-melting dirt particles and impurities, such as silicone, before degassing. The final homogenisation of the melt between filtration and degassing increases the degassing performance. The melt is thus optimally prepared for pelletising. “In addition to the high quality of the regranulate, a major advantage is the flexibility of this machine with regard to the polymer, regrind or film to be processed. After all, flexibility and the highest regrind quality prove their worth even in a challenging economic environment,” says Clemens Kitzberger, Business Development Manager for the Post Consumer Division of Erema Group.
46 PLASTICS RECYCLING WORLD | July/August 2020
www.plasticsrecyclingworld.com
IMAGE: LINDNER WASHTECH
IMAGE: LINDNER WASHTECH
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