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ENGEL : Process plastic flakes directly

Petrochemical industry | 23 Jun 2021 IST | Polymerupdate.com
With a new process, ENGEL makes it possible to process plastic waste directly after grinding as flakes in injection molding. Since a complete process step, granulation, is omitted, the innovation significantly increases the cost efficiency in plastics recycling. At its live e-symposium 2021 from June 22nd to 24th, ENGEL will present the new two-stage process to the specialist audience for the first time and demonstrate the great potential. The new process also has advantages for the production of very large and thick-walled components with high shot weights.

June 23, 2021
The key to shortening the recycling process is the division of plasticizing and injection into two independent, very well coordinated process steps. In the first stage, the raw material, for example plastic flakes from post-consumer collections, is melted in a conventional plasticizing screw. The melt is transferred to a second screw to be injected into the cavity in the second process stage. The two-stage process makes it possible to integrate a melt filter and a degassing unit on the injection side of the injection molding machine, so that products of consistently high quality can be obtained even from contaminated plastic flakes.

With this innovation, ENGEL is making a further contribution to the development of a circular economy for plastics. Granulating the recycled regrind is an energy-intensive process that also usually requires logistical effort. If this step can be saved, the CO2 balance will be improved and the recycling costs will also drop significantly.

More efficiency even for very large components
As an alternative to an injection screw, the plasticizing screw used for melting can be combined with a piston unit. In this variation, the two-stage process is also very efficient for processing very large shot weights of up to 160 kg with a comparatively low injection pressure requirement. The two-stage process enables a more compact system design and lower unit costs than is possible with a conventional one-stage plasticizing and injection process.

In order to eliminate the usual disadvantages of piston injection units when changing materials, ENGEL has developed a new piston design. The rheologically optimized piston tip supports the even flushing of the piston and thus enables a quick change of material and color.

Typical applications are containers, pallets or large fittings. From a shot weight of 20 kg, the processing efficiency increases significantly by dividing the plasticizing and injection processes.
Note: This story has not been edited by The Polymerupdate Editorial team and is auto-generated from a syndicated feed.

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