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Contact freeze dryers use contact (conduction) of the food with the heating element to supply the sublimation energy. This type of freeze dryer is a basic model that is simple to set up for sample analysis. One of the major ways contact freeze dryers heat is with shelf-like platforms contacting the samples.
A good solar food dryer may dry food much faster than some air dryers. Some solar driers can achieve higher food drying temperatures than some air driers. However, direct sun drying can chemically alter some foods, making them less appetizing. [5] Food drying primarily requires heat, and solar radiation can easily be converted to heat.
Tastee-Freez was founded in 1950 in Joliet, Illinois, by Leo S. Maranz and Harry Axene (formerly of Dairy Queen). [2] [3] Maranz invented a soft serve pump and freezer which enabled the product, and their Harlee Manufacturing Company (a portmanteau of Harry and Leo) produced the machines which franchisees would buy and use in their respective locations. [3]
Food drying is a method of food preservation in which food is dried (dehydrated or desiccated). Drying inhibits the growth of bacteria , yeasts , and mold through the removal of water . Dehydration has been used widely for this purpose since ancient times; the earliest known practice is 12,000 B.C. by inhabitants of the modern Asian and Middle ...
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The spray drying technique was first described in 1860 with the first spray dryer instrument patented by Samuel Percy in 1872. [citation needed] With time, the spray drying method grew in popularity, at first mainly for milk production in the 1920s and during World War II, when there was a need to reduce the weight and volume of food and other materials.
McDonald's global sales slumped in the second quarter of 2024, marking the first decline for the fast-food giant since 2020 as inflation-weary consumers pull back on eating out. "I worked [at the ...
In electric heat dryers, an electrical resistant heater is usually placed before the fan to heat the airstream. In some case, a humidistat is employed to control the heater. In solar heat dryers, the drying air passes through the solar collector first to be heated (usually 10 to 12 °F rise), then enters the bin through the fan and motor.
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