Kaleigh Harrison
A new paper and cardboard sorting plant in Collegno, near Turin, is setting a benchmark for Italy’s recycling sector. Developed by
STADLER Anlagenbau GmbH in collaboration with Pellenc ST, the facility is the first in the country to sort six distinct types of
recovered paper materials on a single line.
The 8-ton-per-hour plant integrates STADLER’s mechanical systems with Pellenc ST’s AI-enabled optical sorters. At the core are six COMPACT+ units equipped with Pellenc ST's CNS BRAIN software, using Near Infrared and visible spectroscopy to tackle complex material separation—most notably distinguishing white paper from white cardboard, a common challenge due to their similar appearance but differing market values.
The process begins with ballistic separators that isolate
large cardboard and fine materials, while optical sorters handle the more nuanced separations. These advanced systems allow for the precise recovery of categories such as office paper, deinking paper, and both aluminum and non-aluminum multilayer materials.
The
AI capabilities bring a new level of intelligence to paper sorting, enabling more accurate classification, better purity levels, and improved resale potential across markets that are becoming increasingly demanding in terms of material quality.
Engineering Challenges and Future-Ready Infrastructure
Installed within the confines of an existing building, the project required significant engineering adaptation. STADLER dismantled the previous setup in under a month and delivered a phased installation timeline, including mechanical assembly, electrical work, and system commissioning, all within a tight schedule.
Key adjustments included redesigning the feeding system and repositioning the baler to maximize efficiency without compromising space. The plant was not only commissioned on time but also began operation after just four weeks of performance testing and on-site training for Iren SpA’s staff.
The Collegno facility is a crucial addition to the region’s circular economy infrastructure. It complements other treatment centers in the area, including plastic sorting facilities in Pianezza and Borgaro, establishing a fully integrated waste processing system for the greater Turin area.
Market shifts—like the surge in brown cardboard due to e-commerce and the ongoing decline in print media—have made flexible, high-output sorting essential. By enabling the recovery of more valuable fractions and supporting variable output configurations, the plant helps maintain competitiveness in a changing recovered paper market.
