Pallet shrink oven or shrink tunnel.
https://www.youtube.com/watch?v=y1R_ocMut5s
Previously:
https://www.homemadetools.net/forum/...636#post123438
https://www.homemadetools.net/forum/...321#post121900
https://www.homemadetools.net/forum/...7013#post84858
https://www.homemadetools.net/forum/...737#post105188
https://www.homemadetools.net/forum/...2536#post96570