The demand for extrusion systems that can flexibly process virgin material or residual materials, and ideally both at the same time, is increasing. “Around 90% of all inquiries for window profile extrusion are for coextrusion systems,” reports Gernot Dorn, Dales director at battenfeld-cincinnati Austria, from experience. In addition to flexibility, the focus is on high product quality and simple operation of the overall system.
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Piggyback extruder arrangement with twinEX 75, conEX NG 65 and a flange-mounted multi-layer coextrusion die from Exelliq (©battenfeld-cincinnati) |
With its many years of expertise in the construction of extrusion lines for PVC processing, battenfeld-cincinnati has the suitable solution for every task. As an example of this, the extrusion line manufacturer presented a piggyback extruder arrangement consisting of a twinEX 78 and a conEX NG 65 with a flange-mounted multi-layer coextrusion die from sister company Exelliq as well as a Spider NG 250 PVC single-layer pipehead at its booth at K 2025.
Piggyback arrangements always make sense when little production space is available and a coextrusion solution is nevertheless to be implemented. In the exhibited case, the main extruder is a parallel twin-screw extruder from the twinEX series, which scores particularly well in PVC processing with a high output thanks to its 34 D-long processing unit and optimized screw geometry.
The Intracool screw cooling system and the Air Power Cooling System in the barrel ensure precise temperature control and therefore good melt and product quality. The conEX mounted on top of the twinEX is from the new NG generation, which, with an extended preheating zone and optimized screw design, benefits the high output rates with low shear input. Both extruders can easily process c-PVC, modified PVC types as well as recyclates and those with low bulk densities.
The piggyback arrangement not only saves space but also offers cost benefits thanks to a shared control cabinet and simple operation with high energy efficiency. Thanks to the coextruder's flexible frame design, the die connection is simple and variable.
In addition to the extruder combination, a mono pipehead from the revised Spider NG series will also be on display at the booth. The Spider NG series impresses with its high throughput rates and excellent wall thickness distribution. Dimensional changes can be realized quickly thanks to an innovative nozzle clamping system. With the latest revision, the battenfeld-cincinnati specialists have realized a modular design of the pipe tool, so that the customer has the choice between different volumes and with or without compression stage. Modularity has also been implemented for the support carriage, which is now optionally equipped with a hydraulic or electric swivel device. Depending on the application, the right solution is therefore always available, both the mono and the multilayer pipe head.
