How Does a Turn Into a Butterfly? A Steinert Sorting Story About Brown Goods and Tires

Let me start with the search query that accidentally became this article: “how does a turn into a butterfly?”

I know. It’s missing the word caterpillar. But that mistake taught me more about sorting equipment than any technical brochure did. Because the missing word is the point. A turn doesn’t become a butterfly by wanting it. There’s a process in between. There’s always a process in between.

The brown goods and tires project

I run a materials recovery facility in the Midwest. In 2022, my boss handed me the project nobody else wanted: the brown goods pile and the tire pile. We processed maybe 140 tons of that stuff that year—no, 120, I’m mixing it up with the next month’s number. The exact amount doesn’t matter. The pile was enough to make me stop guessing.

By brown goods, I mean the small electronics and older household gear that show up at our gate—televisions, stereos, vacuum cleaners, coffee makers. Tires are self-explanatory, except they’re not. A tire is steel bead wire, fiber, and rubber that don’t like to separate.

I had one solution in my head: magnets. Put a big magnet over the conveyor, pull out every piece of steel, done. It’s tempting to think that. It’s also tempting to think a caterpillar can turn into a butterfly overnight. It can’t. There’s a whole messy stage called pupation.

The expensive mistake

In September 2022, I approved a purchase order for a STEINERT magnetic separator. The brand was solid. The problem was my specification. I chose the magnet size, but I ignored feed burden, belt speed, and particle shape.

On paper, it looked fine. On the day we started it, the magnet pulled so much steel wire and rubber mat out of the stream that the discharge chute clogged every 45 minutes. We stopped the line, cleared it, started again, and repeated that for eight hours. The cost was $2,800 in labor and a week of delays. The fault was mine.

I still kick myself for not sending one photo of the pile before I ordered. If I had, somebody would have said, “Wait, that’s not a single-stream feed.” The photo would have cost nothing. My mistake cost about $3,200 all in.

What Annika Steinert asked me

That’s when I called Annika Steinert, an applications engineer at STEINERT. She didn’t start with a quote. She asked what my feed looked like. What size? What moisture? How many tons per hour? What did I want out the other side? I had none of those answers.

“You’re asking how does a turn into a butterfly,” she finally said. “But you’re not asking what happens to the caterpillar. The sorter is the process, not the magic.”

How a pile becomes a butterfly

Here’s what I learned only after we rebuilt the line. Brown goods and tires don’t become valuable in one step. After we added a pre-screen, slowed the belt to match the feed, and let the magnet work on a thinner burden, the same STEINERT magnet started working. The stages after it—eddy current, sensor sort—did their jobs because the feed was no longer a matted mess.

When I compared the old magnet-only setup side by side with the full STEINERT line, the difference finally made sense. The magnet-only setup recovered steel but contaminated it with rubber. The full line produced separate streams: steel wire, aluminum, copper, and two rubber fractions.

Seeing the two side by side made me realize that a sorter eliminates a problem only if the problem has been positioned in front of it. It took me one failed start and two weeks of downtime to understand that the best equipment in the world still needs a properly prepared feed. The more I prepared the feed, the better the sorter performed. That sounds obvious now. It wasn’t then.

There is something satisfying about seeing a clean roll of steel wire drop into one container and rubber granulate fall into another. After the stress of the failed start, finally hearing the line run without jamming—that’s the payoff.

One more thing about selling the output: if you call your granulate “recyclable,” keep the evidence. Per FTC Green Guides (ftc.gov/green-guides, 16 CFR Part 260), “recyclable” claims need substantiation based on where the product is actually accepted. That’s not legal advice, but it’s exactly the kind of question a customer will ask. The right answer is a document, not a “trust me.”

The checklist I use now

If you’re about to buy a separator, don’t do what I did. Start with the basics:

• Feed rate in tons per hour (or kg/h).
• Feed composition—what materials, what percentages.
• Particle size range after shredding.
• Moisture and contamination.
• Belt speed and burden depth.

That list has caught 11 problems before we ordered anything. It’s not a substitute for the manufacturer’s questionnaire. It’s just the minimum.

I’d rather spend ten minutes answering questions than deal with another failed start. An informed customer doesn’t just buy better; they run better.

Last thing, for the person who typed “ziekte van steinert behandeling”: that is a different Steinert. It is a real medical term from Dutch, and if that’s what you need, please find a neurologist. This page won’t help with that. But if you meant the STEINERT that separates material, you’re in the right place.