In the early 1970s, Americans were abandoning cars on the sides of roads. Not broken down — abandoned. Junked vehicles were piling up in vacant lots and along highways faster than anyone knew what to do with them. The problem was so visible it became part of Lady Bird Johnson’s Keep America Beautiful campaign. The New York Times ran photos. It looked like a crisis without a solution.
The solution turned out to be economics. Once the infrastructure existed to shred a car and recover the steel, aluminum, and copper inside it, those abandoned vehicles stopped being a liability and became a resource. PADNOS installed one of the first automotive fragmentation systems in the country in 1971. The materials problem didn’t go away — it got industrialized.
That history matters when people ask why so much plastic still ends up in landfills. We’ve been here before.
The Diagnosis Most People Get Wrong
From a purely technical standpoint, almost any plastic can be recycled. The polymer chemistry exists. The processing technology exists. In many cases, the end markets exist too.
So the problem isn’t technology. And despite what you might assume, it isn’t volume — we produce staggering quantities of plastic every day. The problem is that plastics aren’t one thing. They’re dozens of chemically distinct polymer families — PET, HDPE, PP, PS, PVC, ABS, and countless variations — each with different melting points, processing requirements, and end-market specifications. They’re designed for specific applications and manufactured with specific additives. And then they all get thrown in the same bin.
Once commingled, they can’t simply be separated back out. A Materials Recovery Facility — the sortation plant where curbside material goes after collection — can effectively separate two, maybe three material types at scale. Beyond that, the economics of adding dedicated conveyors, optical sorters, and balers for each additional resin type break down fast. It’s not a technology gap. It’s a behavioral and economic problem baked in upstream: there’s no systemic incentive to keep materials separated at the point of use.
Contamination compounds it. A load of otherwise recyclable material mixed with food waste, moisture, or an incompatible resin can flip from a commodity asset to a processing liability in a single step.
The Economics Nobody Talks About
Densification is everything in this business, and it almost never makes it into sustainability reporting.
Plastic film has a densification ratio of roughly 20:1 — meaning loose film will fill an entire semi-trailer without coming close to the 40,000-pound weight threshold that makes a load economical to transport. Without a baler at the point of collection, you’re running nineteen extra trucks to move what one could handle if the material were properly processed first. Expanded polystyrene — commonly called Styrofoam, though that’s technically a Dow-registered trademark — runs 90:1, a ratio so extreme it requires a densifier, not a baler, just to make transportation economically viable at all. That freight cost, compounded by handling cost at the receiving end, is what turns a technically recyclable material into an economically unrecyclable one.
This is why curbside collection using packer trucks works reasonably well for mixed residential streams — the trucks compress as they go. But single-stream collection requires sophisticated sortation on the back end, and every resin needs its own processing line. That capital investment has to be justified by consistent, sufficient volume flowing to a specific stream. Even within a single resin type, form factor changes everything. A clear PET tray produced through extrusion cannot be processed the same way as a PET bottle produced through blow molding, and color contamination through reprocessing is a persistent quality problem that degrades end-market value.
Chemical recycling — pyrolysis, depolymerization, and related technologies — is often positioned as the answer to what mechanical recycling can’t handle. It has a genuine role, particularly for plastic chemistries too caustic or contaminated to process any other way. But it carries a real carbon cost. Studies comparing lifecycle impacts consistently find mechanical recycling carries a substantially lower GHG footprint when both options are viable. There’s an uncomfortable irony embedded in the technology: chemical recycling functions most efficiently on clean, well-sorted feedstock — precisely the material mechanical recycling already handles well. The best solutions in this industry are often the simplest ones. Chemical recycling is a valuable last resort. It shouldn’t be the first answer.
We’re Watching It Happen Again
Here’s the live example worth paying attention to: automotive shredder residue.
When a vehicle gets shredded and the metals are pulled, what remains is a mixed, contaminated stream — foam, fiber, plastic, rubber, dirt — that has historically gone straight to landfill. In the United States, approximately 10 billion pounds of this material gets landfilled annually, much of it as daily cover. For decades it was considered valueless.
PADNOS is now extracting polypropylene from that stream and placing it into packaging applications. The technology works. The material is real. Automotive-grade approval is in process, though qualification typically runs a two-year cycle.
The honest tension: even where the technology works, pricing remains a barrier. Recycled PP from shredder residue can come close to — or exceed — the cost of virgin resin when commodity markets favor virgin. That gap doesn’t close through technology alone. It requires a price signal, which only comes through some combination of regulation, market development, or consumer demand. The EU’s new End-of-Life Vehicles Regulation does exactly that — requiring 15% recycled plastic in new vehicles within six years, rising to 25% within ten. It’s an imperfect instrument, but it’s the kind of demand signal that turns a marginal material stream into an investable one.
The abandoned cars of the 1970s looked like an intractable waste problem until the economics of metal recovery made them worth processing. The 10 billion pounds of shredder residue landfilled every year looks the same way today.
What Actually Moves the Needle
After more than 15 years watching this industry from the inside, the pattern is consistent: recycling works when the economics work. Consistent volume, infrastructure aligned with material reality, honest accounting of who bears the cost, and policy that creates demand signal rather than just aspiration.
Recycling is not free. Collection, processing, sortation, and transportation all have real costs that have to land somewhere — through program fees, extended producer responsibility frameworks, or commodity value when markets cooperate. The circular economy for plastics won’t be built on goodwill. It will be built the same way metal recycling was built: by making the economics work well enough that the infrastructure follows.
The path is clear. The work is unglamorous. And if history is any guide, it’s closer than it looks.
