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Josef Soellner and Werner Kruschitz are entrepreneurs who run established, multi-plant plastics recycling operations in Europe. Each started out on a small scale, and each developed a flexible combination of custom and toll recycling that generates a range of products including flake, pellets, and sheet of different resins. Along the way, both of them came up with their own process technology and built their own machines. And now both of them are offering their home-grown technology for sale to others.

Soellner is founder and sole owner of STF Group in Aicha vorm Wald, Germany. It comprises three companies and seven plants: STF Recycling GmbH, a recycler of PET and polyolefin flake; STF Thermoform-Folien GmbH, a maker of recycled PET and PS sheet for thermoforming; and STF Maschinen & Anlagenbau GmbH, a new operation building STF’s recycling machinery.

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Kruschitz is founder and sole owner of Kruschitz GmbH in Volkermarkt, Austria, an umbrella for four companies. Kruschitz Kunststoff-Recycling GmbH recycles post-consumer PET bottles and industrial scrap. OvoPET Verpackungsproduktions makes recycled PET sheet for thermoforming and crystallized pellets for bottle-to-bottle molding. Sky Plastic toll compounds industrial scrap of PS, PP, and HDPE. And PRM-Handels GmbH is a broker of recycled glass, metal, and plastic, which also recently began building recycling systems.

Built from experience

STF’s and Kruschitz’s successes are due at least in part to their ability to build and assemble much of their machinery in-house, with each new plant incorporating improvements learned from hard-earned experience. “The know-how from daily production of PET flake optimizes the construction of further PET recycling plants,” says Soellner of STF, which recycles approximately 250,000 lb/day of PET flake. Daily use of the machinery “ensures continual development and improvement of the PET recycling plant.”

STF began to sell its home-built recycling machinery 10 years ago, offering what owner Soellner calls his “little pots” to wash flake (see p. 49 for details). Six years ago when PET bottles began to replace glass in Germany, STF built its first hot-caustic friction washer and has expanded with three more PET washing plants since then. STF doesn’t build everything in-house. It buys specialized components like automatic sortation devices and granulators. Other system components are modifications of existing machinery.

In 2002 STF named an agent and exhibited at a couple of German trade shows in 2004 and 2005. There are now 28 STF lines running commercially in Europe and in the Middle East. Soellner isn’t concerned about creating competition in his back yard. STF has done so well with machine sales that Soellner is now considering making machinery his primary 911������, and continuing the recycling operation only to support new machinery developments.

Home-grown technology

Even Kruschitz uses STF’s wash line for PET bottle flake, and also buys 60% of STF’s PET flake output. Then Kruschitz crystallizes and pelletizes the PET for bottle-to-bottle applications.

Kruschitz assembles his own machines for polyolefin flake washing from a number of purchased components. He also builds his complex materials-handling systems to handle a lot of different resins and convey them automatically from flake processing to compounding and pelletizing.

Four large twin-screw extruders compound polyolefins into colored and glass-filled materials. Two compounding lines are dedicated to PP, one to HDPE, and one to PS from yogurt cups. Kruschitz produces 55 million lb/yr of polyolefin compounds for markets like pipe, injection molding, automotive, and office furniture.

After observing STF’s success in building machines for commercial sale, Kruschitz began to offer his recycling plants and machinery for sale. “I’ve seen how well Mr. Soellner does with machinery,” Kruschitz notes. He has already sold two lines, one for LDPE in Yugoslavia and one for HDPE in Indonesia.