Evolution and Impact of Food Extrusion Technology

The foundation of food extrusion lies in the snack and ready-to-eat breakfast cereal industries. Historically, the first application of a cooking extruder in the food industry occurred in the mid-1940s, producing an expanded cornmeal-based snack using a single screw extruder. This snack was most likely an expanded yellow cornmeal ball or curl coated with seasoning such as cheese and salt, resembling products still available from many snack producers today.

Currently, single screw extruders are more prevalent in the food industry than twin screw extruders, mainly because they have been in use longer. Single screw extruders made their debut in the 1940s, while twin screw extruders were not developed for the food industry until the early 1980s. However, twin screw extruders are rapidly becoming the preferred choice due to their greater versatility.

Twin screw extruders offer several advantages over single screw extruders. They are more adept at handling variations in raw materials that occur year by year and from crop to crop, making them ideal for processing complex formulas with difficult ingredients. Additionally, they provide superior conveying and pumping abilities and better heat transfer. These capabilities make twin screw extruders more efficient and adaptable, which is critical in today's fast-evolving food industry.

In the mid-1970s, there were probably only four suppliers of food extruders, all producing single screw extruders. These machines were primarily used to produce snacks, ready-to-eat breakfast cereals, and textured vegetable proteins. By the late 1990s, the number of food extruder suppliers had increased to at least ten, reflecting the growing demand for these machines and the expanding variety of extruded food products.

Today, the food extrusion industry continues to innovate, driven by consumer demand for diverse and convenient food options. Extrusion technology has advanced significantly, offering improved efficiency, product quality, and versatility. As the food industry evolves, extrusion technology will likely play an increasingly vital role in meeting the challenges of food production and satisfying consumer preferences.
Evolution and Impact of Food Extrusion Technology

Evolution of Extrusion Technology

Extrusion, a process with ancient roots dating back to civilizations like Egypt and Mesopotamia, involves a screw within a cylindrical chamber. The credit for this foundational concept goes to Archimedes of Syracuse, a Greek mathematician and physicist who lived around 287–212 BC. Archimedes' inventive use of a screw within a wooden apparatus to elevate water from lower to higher levels was remarkable for its time.

This straightforward principle turned out to be pivotal across diverse industries, encompassing metals, ceramics, concrete, plastics, polymers, and even the production of food and feed.

Over the last couple of centuries, extrusion technology has undergone substantial transformation. Joseph Bramah acquired the initial extrusion patent in 1797 for crafting lead pipes via a ram-type machine and die. The technique, known as 'squirting,' eventually gave way to Thomas Burr's hydraulic press in 1820.

A pivotal advancement came in 1894 when Alexander Dick introduced the modern hot extrusion process, applicable to a wide range of non-ferrous alloys. The earliest documented extrusion apparatus featured a toothed rotor propelled by a winch within a toothed cylindrical cavity, primarily employed for rubber processing.

In 1820, Thomas Hancock developed a rubber masticator to repurpose rubber scraps, while Edwin Chaffee's creation of the first two-roll machine for rubber mixing in 1836 laid the groundwork for plastic extrusion devices, even though they weren't originally designed for that purpose.

In 1845, Richard Brooman and Henry Bewley patented the extrusion of Gutta Percha for copper conductor insulation. The inception of the extruder, a pivotal element in polymer processing, is linked to Mathew Gray's 1879 patent in England. Around the same time, Royle in the US also devised a screw machine.

The inaugural food extruder emerged during the 1870s for sausage production. In the 1930s, breakfast cereal manufacturing embraced extrusion to shape precooked dough, characterized by low shear rates. In 1933, the first continuous single-screw extruder with profiles conducive to low-temperature drying was introduced, supplanting batch systems.

In the late 1930s and 1940s, high-shear extruders facilitated the production of directly expanded corn curls. The inception of twin-screw extrusion technology was marked by the filing of the first patent in the mid-1950s.

While single-screw extruders found utility in the 1940s, twin-screw counterparts found their way into the food industry in the early 1980s and quickly gained popularity.
Evolution of Extrusion Technology