Restaurants with the highest volume of traffic, such as McDonald's, often opt to use pre-made milkshake mixtures that are prepared in automatic milkshake machines. These machines are stainless steel cylinders with beaters that use refrigeration coils to freeze pre-made milkshake mixtures into a drinkable texture. The number of different flavors that a restaurants with automatic milkshake machines can serve is limited by the number of different tanks in their milkshake machines, and fast food restaurants usually offer fewer flavors of milkshakes from ice cream.
The smallest automatic milkshake machines are counter-mounted appliances that can make a single milkshake flavor using a five liter stainless steel tank. Large restaurants that wish to offer multiple flavors can either use floor-mounted multi-flavor machines with multiple five liter stainless steel barrels or use carbon dioxide-based machines that mix the flavors during dispensing. Some fast-food restaurants use "thick milkshake" machines, which are single-flavor machines with a (12 liter) stainless steel tank.
Source : wikipedia
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