In actual practice, most plastic bags are not recyclable. The stores don't take them back (except my dry cleaner takes back the big plastic garment bags), curbside recycling doesn't take them, even at a recycling center they don't want them because they don't have a plastics recycling number on them. I use a few for garbage of various sorts or to hold a book or magazine when I'm walking outside, but that's not nearly all of them if I just accepted the plastic bags stores give me for groceries.
There's a bin to put them back in in the stores around here (where I live, not referring to where I am now on vacation).
Former workers tell me that despite the bins, the bags really never get recycled, either because they get mixed up with the garbage anyway or the recycling center doesn't really recycle them at their point.
Collection benefits may be compacting them to save landfill capacity and making sure bags are not scattered around.
Overall, plastic recycling isn't economically attractive, as far as I understand; and contaminations can quickly cause equipment problems. I imagine receipts would be the plague of shopping bag recycling.
Interesting point. When I lived in northwestern Virginia, the local landfill (a joint venture of Frederick County, Clarke County and the City of Winchester) took everything that had a recycling logo (plus some recyclables that didn't). What amazed me was that they had a dumpster specifically for Styrofoam
TM (and similar foam packing products), which are a type of polystyrene (thus a #6 recyclable). Even back then, it was a foregone conclusion that packing foam could not be recycled cost effectively. I never knew for sure, but it wouldn't surprise me that they were going to compact various forms of leftover "recyclables" that were too expensive to recycle and store them in segregated areas of the landfill so that they could be dug up whenever that type of plastic was needed.
There's an article out this week in the EnergyFactor eMag entitled Advanced Recycling:
A Different Way to Recycle. In a nutshell, the main thrust was how chemical processes were going to be used to separate aluminum mylar from plastic wrap packing. Mega-grocer Ahold Delhaize and artificial turf manufacturer TenCate Grass were partners in the recycling prototype effort. (Around here, Delhaize affiliate Food Lion is well-known for accepting all types of plastic bags and plastic films as recyclables). Again, to the point, it wouldn't surprise me that they compacted the various forms of leftover "recyclables" and stored them in segregated areas of the landfill..." Sounds like they are exploring how to dig this stuff out and try to use it. When the main ingredient is "free", the rest of the cost of a product is simply a "production cost".
For the record, EnergyFactor eMag is produced by ExxonMobil. I tend to pull up articles about chemical processes, so I'm guessing that's how I ended getting "tagged" with this article.