Maximum added value in production
New Conical Technology (NCT) is based on a conical, co-rotating twin screw extruder. The excellent process engineering characteristics of NCT extruders are achieved first and foremost by the high disposable volume and high coverage of the co-rotating screw shaft. Due to the conical design the intake volume is significantly greater than the discharge volume, resulting in an extremely high screw filling level. This leads to high volume throughput per revolution with excellent melt pressure stability and at the lowest possible melt temperature.
The technology benefits:
- large input volumes and thus excellent feeding characteristic
- high melt pressure build-up and maximum pressure stability, thus removing the need for a melt pump in most cases
- large shaft diameters allow for high torque
- easy removal of the screw via the rear of the extruder
- excellent homogenisation characteristics
- excellent feeding behaviour guarantees a short melt retention time in the extruder at low melt temperature
- extremely low specific energy consumption
Individually configurable
The screw assembly of the NCT compounder consists of a feeder and an extractor screw. Each of them is manufactured from one piece and available in a number of different pitches and number of starts. The mixing and shearing parts are customised to reflect the buyer's individual requirements. The cylinder zones are equipped with heating shells and liquid cooling. The three-part cylinder can also be modified to match customer requirements. (with/without degasification, position of degasifying aperture etc.).
The mixing and plasticizing capacity is set by replacing the screw elements. Due to the conical design, an extremely fast screw changeover is possible. The downstream equipment remains in situ, the cylinder is swivelled out and the screws can be pulled out to the rear without further tools.
Compact, robust, durable
Generous axis spacing ensures a large intake volume and thus guarantees perfect feeding performance. Shaft diameters are dimensioned accordingly, allowing the use of robust thrust bearings and thus transmission of high torque.
| Type | Material | Output |
|---|---|---|
| NCT 40 | e.g. PE / PP / PS / PET | approx. 200 kg/h |
| NCT 55 | e.g. PE / PP / PS / PET | approx. 500 kg/h |
| NCT 90 | e.g. PE / PP / PS / PET | approx. 1000 kg/h |
Universal range of applications
MAS handles project planning and supplies complete plastics recycling systems, if required with melt filter and pelletising, including the full range of peripherals. NCT technology makes it possible to customise the extruder to precisely reflect the user's requirements. The range of applications extends from materials with low bulk density (e.g. PET) through standard applications to plastics with more complex processing (e.g. rubber composites). MAS extruders are also perfect for manufacturing and processing plastic compounds.
Extrusion / Recycling
- recycling of polyolefins and technical plastics
- recycling of plastics that are sensitive to temperatures and shearing
- admixing of dies, additives such as CaCO3, talcum, etc.
The MAS extruder is perfectly suited for any application where high quality requirements and a variety of product requirements necessitate an individual solution.
Compounding
The conical, co-rotating MAS extruder offers process stability and economic compounding of plastics with very different characteristics wherever it is necessary to fulfil the strictest quality requirements. Especially in the following areas
- WPC (Wood Plastic Composites)
- PPC (Paper Plastic Composites)
- admixing of CaC03 and talcum
- admixing of glass fibres
- admixing of dies / comparable additives
Thanks to its conical design with a substantially larger feed volume, the MAS extruder offers decisive advantages. From a process technology point of view, excellent results are achieved even when admixing/compounding high volumes of glass fibres (more than 50% supported) with a PE/PET or PP melt. A single admixing aperture is used to feed all materials. Complicated multiple dosing, which is typical for cylindrical designs, is totally unnecessary.
Direct extrusion of WPC / PPC / NFC
Due to the conical design and the resulting excellent pressure stability of the extruder, process reliability in direct extrusion of WPC/PPC and NFC profiles is ensured. Extruded WPC/PPC/NFC profiles with a wood, paper or fibre content of up to 80% and at the same time excellent mechanical characteristics are unique selling points in this market sector for MAS's NCT extruders.
Customer-specific solutions
MAS co-operates closely with IFA Tulln, the Institute for Natural Materials Technology at the University of Natural Resources and Applied Life Sciences, Vienna. Together, we develop holistic concepts including suitably stable process technology – from the initial idea to the development of product-specific recipes with profile extrusion trial runs and analysis of mechanical characteristics to prove the process and product are all undertaken.
Best quality in PET extrusion
The MAS extruder is perfect for processing A PET, G PET and GAG PET, both for repelletising and for direct extrusion to products.
The large aperture in the conical extruder supports feeding of both PET grinding stock (e.g. from PET bottles and preform) and of ground cast or BOPET foils. There is no need to precrystallise or predry the PET.
As the extruder's intake volume is significantly greater than the discharge volume, an extremely high screw filling level is achieved. This helps to achieve high output values at slow screw speeds and at a correspondingly low melt temperature. This results in excellent colour values and lowest possible IV loss. The low thermal load, accompanied by very low specific energy consumption (≤ 0.22 kWh/kg) thus allows for highest quality extremely economically.
