A typical plastic recycling system does not exist. Period
Lines can be quite similar, because machinery are the same, but items can vary, sometimes a lot, based on man power, energy, water, space availability, production rate, final request of the product a few more, may be less important but effecting operating cost anyway.
So, in the event that you ask to numerous supplier for an give, you'll receive a bunch of various things according using what the supplier is guessing best suited that moment.
If you know exactly what you want, you go head and pick the best top quality at the cheapest price while, if you don't know...........you're in big trouble.
I highly believe the only way screw extrusion to lay down the proper system is to sit back with the client and go in all possible details; misunderstandings will happen anyway but limited to little items that don't need many to be fixed.
Here soon after I'll make few examples of plastic recycling systems for the most common application but, please make sure to, don't take them as the Bible because, once again, lot of things can be quite different.
PET bottles washing lines first, with some explanation about the technology I would recommend and some possible variation according to which quality flakes you're trying to get.
Then, HDPE cleansing lines for crates, bottles and drums/or any olefin ground material.
LDPE/HDPE film washing lines together with Mix plastics washing and separation systems.
Also, few words just about CD disks washing and Computer scraps separation and washing.