Processed cheese

Processed cheese (also known as prepared cheese, cheese product, plastic cheese or cheese singles) is a food product made from cheese and other unfermented dairy ingredients mixed with emulsifiers. Additional ingredients, such as vegetable oils, salt, food coloring, or sugar may be included. As a result, many flavors, colors, and textures of processed cheese exist. Processed cheese typically contains around 50-60% traditional cheese.
Its origins are in the U.S., when in 1916, Canadian-American businessman James L. Kraft applied for the first U.S. patent covering a new method of processing cheese, which halted the maturation process.
Advantages.
Processed cheese has several technical advantages over natural cheese, including a far longer shelf life, resistance to separating when cooked (meltability), and a uniform look and physical behavior. Its mass-produced nature provides arguably its greatest advantage over natural cheese: a dramatically lower cost — to producers and consumers alike — than conventional cheesemaking. This, in turn, enables industrial-scale production volumes, lower distribution costs, a steadier supply, and much faster production time compared to traditional cheeses.
The use of emulsifiers in processed cheese results in a product that melts without separating when cooked; with prolonged heating, some traditional cheeses (especially cheddar and mozzarella) separate into a lumpy, molten protein gel and liquid fat combination. The emulsifiers (typically sodium phosphate, potassium phosphate, tartrate, or citrate) reduce the tendency for tiny fat globules in the cheese to coalesce and pool on the surface.
Because processed cheese does not separate when melted, it is used as an ingredient in a variety of dishes. Unlike some unprocessed cheeses, heating does not alter its taste or texture.
Sale and labeling.
Processed cheese is often sold in blocks, pressurized cans, and packs of individual slices, often separated by wax paper, or with each slice individually wrapped by machine.
United Kingdom.
In the United Kingdom, processed cheese is typically sold in individually wrapped slices, often referred to as "singles", or in foil-wrapped portions. Dairylea and The Laughing Cow are leading brands.
United States.
In 1916, Canadian James L. Kraft applied for the first U.S. patent for a method of making processed cheese. Kraft Foods Inc. developed the first commercially available, shelf-stable, sliced processed cheese; it was introduced in 1950. The first commercially available individually wrapped cheese slices were introduced in the U.S. by Clearfield Cheese Co. in 1956. These forms of processed cheese have become ubiquitous in U.S. households ever since, most notably used for cheeseburgers and grilled cheese sandwiches because of its ability to cook evenly, distribute/stretch smoothly, and resist congealing, unlike traditional cheddar cheeses. Competitors lobbied unsuccessfully to require processed cheese be labeled "embalmed cheese".
The best known processed cheese in the United States is marketed as American cheese by Kraft Foods, Borden, and other companies. It is yellow or off-white, mild, has a medium consistency and melts easily. It is typically made from a blend of cheeses, most often Colby and cheddar. Another type of processed cheese created in the United States is Provel pizza cheese, which uses cheddar, Swiss, and provolone cheeses as flavorants. Provel cheese is commonly used in St. Louis-style pizza.
Legal definitions.
Owing to its highly mechanized (i.e., assembly line) methods of production, and additive ingredients (e.g., oils, salts, or colors), some softer varieties of processed cheese cannot legally be labeled as actual "cheese" in many countries, even those in which slightly harder varieties can be. Such products tend to be classified as "cheese food", "cheese spread", or "cheese product" (depending primarily on the amount of cheese, moisture, and milkfat present in the final product).
United States.
In the United States, processed cheese is defined, categorized, and regulated by the Food and Drug Administration (FDA) under the U.S. Code of Federal Regulations Title 21, Section 133 ("Cheeses and Cheese-Related Products"). Pasteurized process cheese can be made from a single cheese, or a blend of several cheeses. Cream, milk fat, water, salt, color, and spices may also be added. The mixture is heated with an emulsifier, poured into a mold, and allowed to cool. The definitions include:
The FDA does not maintain a standard of identity for either "pasteurized prepared cheese product", a designation which particularly appears on many Kraft products, or "pasteurized process cheese product", a designation which appears particularly on many American store- and generic-branded singles. Products labeled as such may use milk protein concentrate (MPC) in the formulation, which is not listed in the permitted optional dairy ingredients. The desire to use inexpensive imported milk protein concentrate is noted as motivation for the introduction of these and similar terms, and for the relabeling of some products. After an FDA Warning Letter protesting Kraft's use of MPC in late 2002, some varieties of Kraft Singles formerly labeled "pasteurized process cheese food" became "pasteurized prepared cheese product", Velveeta was relabeled from "pasteurized process cheese spread" to "pasteurized prepared cheese product", and Easy Cheese from "pasteurized process cheese spread" to "pasteurized cheese snack".