Rodolphe Lindt invented the conche in 1879 to improve chocolate texture. The machine kneads and aerates chocolate for an extended period, helping create a smoother texture and more developed flavor.
According to the traditional account, Lindt accidentally left a refining machine running over a weekend. The resulting chocolate was unusually smooth and fluid, leading him to develop the conching process. The name comes from the shell-like shape of early machines, which resembled a conch.
Conching is different from grinding cacao into chocolate liquor and from tempering finished chocolate. Grinding reduces particle size, while conching helps remove unwanted volatile compounds and distributes cocoa butter more evenly. Modern industrial conches vary greatly in size and design, but the basic purpose remains the same.