The cutting specialist for wet materials
If the material has a high moisture content, the plastic recycling system C:GRAN is the ideal solution. Flakes or films with a residual moisture up to 25 % are processed in this plastic recycling system without problems thanks to its excellent pre-drying properties.
C:GRAN is distinguished by its advanced cutting geometry. For this, the fast-moving rotating blades in the cutter bin have been combined with efficiently arranged guides at the cutter bin outlet. In this way, the material is prepared for the extruder screw. C:GRAN is also an ideal option for a component of a cascade extruder or a compounding system.
ABMF is the automatic band-melt-filter perfectly matching C:GRAN. It has outstanding properties such as high degrees of filtering fineness, continuous extruder operation during the band filter transport, cyclic band filter replacement and fully automatic operation.
At a glance
- Preparation of flakes and films with residual moisture up to 25 %
- Output rate up to 1,700 kg/h (3,700 lbs/h) depending on type
- Temperature regulation in the cutter bin
- Ideal as a component of a cascade or compounding system
- Makes a perfect combination with ABMF melt filter
* Output values for LDPE according to NGR company standard, depending on material and quality.
In addition, NGR provides all the equipment for conveying pellets such as blower, pipes, cyclones and much more.
The operating principle of C:GRAN
The plastic scrap is shredded in the cutter bin by rotating blades. Specially arranged guides ensure that the plastic scrap is further compressed in the direction of the rotating blades.
In the cutter bin. the additional plastic scrap is shredded, compressed, heated and fed into the extruder screw.
The advanced extruder screw design allows for better utilization of the material compaction from the cutter bin. This leads to an improved output rate at the desired high degree of homogenization and low energy input.
Specially developed for the challenges of recycling, the extruder screws provide optimum melt homogeneity. The extruder screw, which was designed specifically for use with the cutter compactor, takes the already heated material and provides high output rates.
All equipment functions from feeding to pelletizing are controlled automatically from the easy-to-read NGR touchscreen. Recipes are managed in the operator control unit, which increases traceability, provides ease of use, and ensures equipment parameters are set properly.
In addition to high quality, the uniform pellet size also provides for homogeneous mixture in new material. NGR thus plays an indirect role in ensuring consistent quality in the final product.
With variable feed speed, roll scrap is treated in a process-controlled manner. The virtually unmanned machine is fed continuously. The roll feeder can be operated at the same time with other types of feeding (e.g. conveyor belt).
The conveyor belt transports the feed material through a metal detector into the feed hopper. The belt is stopped automatically, if metallic matter is detected in order to remove it.
Additives such as color pigments, CaCo3, compatibilizers can be added to the material flow in a process-controlled manner. Dosing systems for pellet and/or powdered additives are available.
Designed for light printing and low humidity. The vacuum degassing system includes a vacuum pump and is connected to two venting ports on the extruder.
Designed for plastics printed, for example, on all surfaces and/or moist plastics.
In addition to the modular venting unit, a combination of water ring pump and high-performance vacuum pump runs in order to increase the vacuum performance (e.g. PET processing).
Vacuum pump with closed water circuit
Each venting combination can be equipped with a closed water circuit. The fresh water consumption at the vacuum pump is thereby reduced significantly.
Hot-die Waterring Pelletizer (HD)
For thermoplastics with a higher viscosity. The melt exits through the wear-resistant die plate, and is knocked off by the pelletizer blades. The pellets cooled in the water ring are flushed out, dried in the centrifuge and discharged. By adjusting the blade pressure, pelletizer blades provide a long service life; replacement is quick and easy.
Strand pelletizer (SP)
For low-viscosity melts. The melt emerges from strand nozzles, is cooled in a water bath, dried by means of a fan and cut to the desired length in the pelletizer. The result is cylindrical, dust-free pellets with excellent mixing properties.
Automatic strand pelletizer (A-SP)
In addition to the benefits of the SP, the A-SP option offers the added convenience of fully automated start-up. The strands are transported automatically by a water slide to the pelletizer, and the pellets are dried in a centrifuge.
Underwater pelletizer (UWP)
For difficult-to-process (e.g. sticky) polymers or thermoplastics with a very high melt flow index. The melt emerges from the die plate and is knocked off by the pelletizer blades. The whole process takes place under water. In the centrifuge, the pellets are separated from the process water and dried.
Double-piston screen changer
For light impurities. The hydraulically operated double-piston screen changer allows continuous filtration of the melt. This allows a screen change without process shutdown.
Back-flush screen changer
For heavily contaminated materials. The hydraulically operated double-piston screen changer filters the melt in a process-controlled and continuous manner. The integrated backwash device automatically cleans the screens. The number of back-flushes and the related service life of the screens depend on the degree of contamination of the material.
4K back-flush filtration
For heavily contaminated materials. In contrast to the standard backflush screen changer with 2 screen cavities, this system is equipped with 4 screen cavities. The double filtration surface with the same frame size results in a longer filter life.
Band melt filter
For high contamination at high throughput rates. With the lowest melt losses and low filter costs, fully automatic operation ensures excellent filtration results. It is used particularly for post-consumer plastics.
High-performance melt filter
For heavily contaminated materials with low viscosity. The extraneous material is trapped by a rotating filter drum and removed by the rotation of the drum to a wiper. This separates the extraneous material from the filter and leads it directly to a discharge screw.
The throughput scale is integrated in the machine control system and displays the current production output in kg/h (lbs/hr). The data can be logged in a BDE system.
Gas control unit
This unit provides quality control by continuously measuring pellet density. Based on preset parameters, the unit determines whether to switch the gates to the second choice or to scrap when this value falls below a setpoint. Monitoring is inline and integrated continuously in the production process.
For continuous melt viscosity measurement. Melt is taken from the production extruder, the viscosity is measured, and then the melt is returned to the extruder.
Based on the differential pressure across the capillary, the viscosity of the material (IV value, MVR) is determined by means of a stored recipe.
Our all-round service – satisfaction included
Excellent technology calls for excellent service. Our 100% commitment to flawless service ensures maximal cost efficiency and minimal downtime.
- Service hubs for the fastest possible processing of all maintenance and repair work
- Spare parts centers for flexible responses to strong markets
- High spare parts availability thanks to particularly high stock levels in Europe and North America
- Worldwide extruder screw production for short-term production or repairs
- Easy ordering of parts in our webshop
- Starter and spare parts packages for every new machine
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