time for line to remember
Duck - maybe the reason no one replied yet is that there is a lot of variation for lines coiling up and kinking.
I use, literally, a couple hundred different lines, mostly plastic and internally braided. Some, like Cortland's SYLK and the 444 Peach (and Hook & Hackle's olive) are pretty limp and stay that way. Even in cold weather, which is when many plastic lines get all squirrely.
A generality, despite the big variations in polymer and plasticizers, is that the stiffer the line, the more it will coil up. Another rule is that winding a line tightly and on a small arbor will make a lot of lines get the kinks over a winter or less of disuse. As you might imagine, the tighter you wind the line, the more it will kink - I think if you wind tightly while the line is warm, such as sitting in a hot car, and then store it in cooler temps, such as in a basement, you amplify the coiling.
Some lines, like very early AirFlos and some Masterlines, are so coily I use them mainly in warm weather. Early versions of Cortland 555 and one of the Monic models seem intrinsically prone to kinking.
Sometimes, I get the feeling occasional batches of an otherwise ok line might be more coily. Some lines, like some Masterlines, get limper after a break-in period. On the other hand, some lines (early Corltland 333's) get stiffer and more coily with age, probably due to plasticizer migration.
Someone else suggested a good stretch each day takes care of the coiling, and that I've found generally true.
Then there are situations where your line is developing a spiral kink from a chronic parachuting of your leader-fly setup and repeated false casting.
tl
les