But it has come to be a sort of vulcanizer, to make plain English, irony.
When the goods are cured steam is blown off, the vulcanizer opened and the cloths are removed.
1827, "to put into flames," from Vulcan (q.v.), name of the Roman god of fire, + -ize. As a treatment for rubber, first recorded 1846. Related: Vulcanized; vulcanizing.