A line tested on virgin resin in a supplier's laboratory performs to specification. Installed in a recycling plant, running bottle flake and film scrap, it behaves differently: moisture, contamination, and material ratio shift with every batch, so the same machine under-plasticizes one week and produces inconsistent pellets the next, while wear parts fail far ahead of schedule.

The fault usually is not the plant's sorting and washing. It is that the equipment was specified for a stable feedstock that does not exist in recycling.

Nanjing Kerke Extrusion Equipment Co., Ltd. (科尔克) has met that condition across domestic and overseas projects and treats field performance, not catalogue parameters, as the measure of a machine.

The company was founded in 2009 and is a national high-tech enterprise and national-level technology-based SME. Its 20,000 m² base includes a CNC precision machining shop and an in-house test and development center, with screws and barrels machined in-house.

Product range

Kerke builds modular co-rotating parallel twin-screw equipment, from laboratory models through mid- and large-size production units to two-stage compounding lines and single-screw waste film recovery equipment, with metering and feeding auxiliaries.

Laboratory Extruder Series.

KTE Series Co-Rotating Parallel Twin-Screw Extruder.

KTE-T Series Co-Rotating Parallel Triple-Screw Extruder.

Capacity spans 100–1,200 kg/h. Beyond recycling, the company supplies equipment and complete lines for compounds, functional masterbatch, degradable materials, and cable compounds; several thousand units are in operation, sold into more than 70 countries.

Iteration from feedback

Much of the product development comes back from projects: abrasive or contaminated recyclate drives reinforced screw and barrel wear protection; unstable grid supply at some overseas sites led to added voltage protection in the control system; plants needing dust control are supplied with enclosed feeding. The in-house center runs customer feedstock trials to establish process feasibility before an order.

Korea: PET flake

A Korean recycler processing washed PET flake carried residual moisture and inconsistent contamination. On the existing line, pellet intrinsic viscosity dropped measurably during production and output failed downstream supply standards; operators also had no twin-screw experience.

Kerke specified a 65-series twin-screw with loss-in-weight feeding and redesigned the screw configuration and multi-stage vacuum devolatilization for the volatiles in recycled PET. The machine was tested complete at the factory, then engineers commissioned it on site through no-load and loaded runs, calibrating the process until production stabilized.

Training covered start-up and shut-down, parameter adjustment, inspection routines, part replacement, and fault response, to the point where the local team ran the line independently.

Bangladesh: one machine, two processes

A Bangladeshi producer taking both PE film recovery and filled masterbatch orders needed water-ring hot-cut and strand pelletizing from one machine rather than two.

Kerke built a dual-process PE line at 300–400 kg/h: changing selected auxiliaries switches the same main unit between water-ring hot cutting for rounded pellets from film and strand cutting for cylindrical pellets in filled compounds.

Both processes were trialled before shipment, so the plant covers two product lines from one main unit, without a second machine and its floor space.

Project support

Service runs through four stages: feedstock, capacity, and plant power assessed before selection, with no push toward oversized models; simulated trial production against the customer's material before dispatch; on-site installation and training overseas, remote support domestically with process advice when feedstock or formulation changes; and in-house stocking of screws and barrels as wear parts to shorten downtime.

About the CRRE exhibitor

Founded in May 2009, Nanjing Kerke Extrusion Equipment Co., Ltd. designs, manufactures, and sells modular co-rotating parallel twin-screw pelletizing equipment and components. In 2020 it a wholly owned subsidiary with investment of about RMB 200 million.

Booth: B1C41

About CRRE 

CRRE is positioned as a national-level platform, with deep integration across the whole chain and broad international collaboration. It adopts a “summit forum + physical exhibition” dual-engine model. It is committed to building the first five-in-one super hub for resource-circulation in the Asia-Pacific region, covering: recycling – reprocessing – high-value applications – green finance – international rules.

Preregistration:

https://reg.crre-expo.com/CRRE/visitor-registration/eng?Regsource=RAZ23777