When cotton is spun the twist must be set. I don't have a piece of PVC pipe to use yet so I have improvised with a frying basket.
The spun cotton I wind from bobbin to the basket. It then gets put in a pot of boiling water for another 45 minutes, rinsed, dabbed with a cloth and then hung to dry.
These are small sample skeins so they are not hard to handle.
It works and its free.