Glass production is broken down into two general categories: container production and sheet production. Bottle machining is part of glass container production. Hot End Processes. Bottle manufacturing takes place at a glass container factory in multiple steps. The first stage of glass-container making begins with the hot end processes, which typically employ high amounts of heat to produce and shape a glass container. A furnace is first used to mold molten glass, which fed to the furnace as glass feed stock.