You can recycling PET bottles, beer cans and similar round shapes objects (junk) to thread.
Basically recycling means: to treat things (junk) so that they can be used again.
Thread is a raw material for production, usually for sewing or making fabric or some similar things.
PET is very strong material. 1.5mm PET thread can hold 5kg at least (I don't know exactly).
A 2l PET bottle can be recycled to 3mm thread 20m long.
Step 2: Remove top and bottom
There should be a straight edge.
Step 3: Start cutting
Be careful, the string should to be continuous.
Follow the edge and cut width you want. (I cut 2-3mm it's hard to be absolutely precise)
Be patient and try to be precise.
Step 5: Coilling
Fix the initial end of thread between the wire and start coilling.
Move thread left and right along the holder during the process.
Fix the final end of thread with piece of tape.