Plastic bottle blow molding process. 0:55 video:
https://www.youtube.com/watch?v=WKfID-i41sc
Previously:
https://www.homemadetools.net/forum/...840#post133521
https://www.homemadetools.net/forum/...585#post136262
https://www.homemadetools.net/forum/...260#post134854