From the Sector

With the goal of making recycling of lightweight, high-volume fiber and flake recyclate much more economical and, in some cases even possible, Coperion has developed a new version of its ZS-B side feeder. Using the innovative ZS-B MEGAfeed, plastic recyclate with a bulk density under 200 kg/m³, long considered intake-limited and thus not worth recycling, can be reliably fed in large quantities into Coperion’s ZSK twin screw extruder and be concurrently recycled and compounded.

The ZS-B side feeder’s novel design makes it possible to feed very high rates of fiber and flakes, such as PA, PE, PET, and PP. As a result, the ZSK twin screw extruder’s high capacity can be fully exploited when the ZS-B MEGAfeed is used. Very high throughputs in both mechanical and chemical recycling of post-industrial and post-consumer waste are achieved.

Increased Throughput in Numbers
With a ZSK 58 Mc18 twin screw extruder, the throughput increase and thus the potential of the new ZS-B MEGAfeed becomes very clear. When recycling PA fibers with a bulk density of ~40-50 kg/m3, throughputs of 70 kg/h were previously achieved using conventional equipment. When the PA fibers were fed into the ZSK extruder using the ZS-B MEGAfeed, throughputs increased about fourteenfold to 1,000 kg/h. Similar results were achieved recycling carbon fibers with a bulk density of ~50-70 kg/m3; in this case, throughputs increased from 50 kg/h to 2,500 kg/h using the ZS-B MEGAfeed. When recycling PCR (Post-Consumer Recycled) flakes, throughputs increased from 50 kg/h to 700 kg/h, and from 80 kg/h to 1,300 kg/h with multilayer film flakes.

Key to Economical Recycling of A Wide Variety of Plastics
Plastics previously considered not recyclable are becoming a valuable raw material using the new Coperion ZS-B MEGAfeed. For example, PCR flakes or recyclate from carbon fiber-reinforced plastics can now be fed into the ZSK extruder at high feed rates and recycled economically.

In the case of mechanical upcycling, upstream processes necessary for compounding, such as compacting, melting and agglomeration, are completely eliminated using the ZS-B MEGAfeed technology. In this recycling process, flakes and fibers can be fed directly into the ZSK extruder, where they are melted, compounded, devolatilized, and filtered in a single step. In so doing, both investment costs and energy consumption drop. The production process becomes significantly more efficient. Moreover, the thermal product stress is reduced and recyclate quality increases.

Even when recycling PET, the feed rate is no longer a limiting factor. With the ZS-B MEGAfeed, PET flakes and fibers can be fed into the ZSK twin screw extruder in large quantities with no pre-drying or crystallizing, where they can be processed with the highest degree of profitability.

The ZS-B MEGAfeed can also feed large quantities of post-consumer waste, adding appreciable value to the chemical recycling process with the ZSKs. ZSK throughput rates are very high with the ZS-B MEGAfeed. Preheating of the recyclate via mechanical energy input of the twin screws thus becomes even more economical for further processing in the reactor.

Existing Coperion extruders can be retrofitted with ZS-B MEGAfeed technology to greatly expand their spectrum of applications and increase their throughput rates.

The Spanish recycling company Anviplas has been involved in plastics recycling for more than 30 years, during which time it has built up extensive know-how that now benefits customers throughout Europe, in Africa and in Asia. Their cooperation with EREMA is almost as long. Since 1991, Anviplas has relied on the technology and service provided by the Austrian recycling machine manufacturer.

Employing 64 people, Anviplas recycles post-industrial and post-consumer plastic waste, especially HD and LD-PE as well as PP, to make recycled pellets in all colour variations. The production capacity is 1,800 tonnes per month. An EREMA type INTAREMA® 1716 TVEplus® recycling machine with screen changer is in operation at the site in Navarcles (Barcelona) for processing the PP material stream. This patented extruder system was developed for handling difficult-to-process materials, such as heavily printed films as well as very moist waste. This machine is characterised by its optimised 3-stage degassing system; firstly by preheating and predrying the material in the preconditioning unit, secondly because the screw design allows reverse degassing, and thirdly in the degassing zone of the extruder.

Anviplas customers manufacture a huge bandwidth of products made using their recycled pellets. They range from various film products, such as stretch, shrink, mulch and silage films, to irrigation, corrugated and high-pressure pipes, as well as containers such as tubs, bottles, barrels and crates.

In February 2022 the Repeats Group, a pan-European platform for LDPE recycling, and Anviplas announced, that Repeats has made an investment in the Spanish recycling company. For Repeats this investment in Anviplas represents an important step in building a pan-European plastics recycling platform.