Goods and services. Workers in the food manufacturing industry link farmers and other agricultural producers with consumers. They do this by processing raw fruits, vegetables, grains, meats, and dairy products into finished goods ready for the grocer or wholesaler to sell to households, restaurants, or institutional food services. Food manufacturing workers perform tasks as varied as the many foods we eat.
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Frozen foods are ubiquitous in American supermarkets, and are increasingly a part of the food industry worldwide. Fruits and vegetables are usually frozen within hours of being picked, and when thawed, they are very close to fresh in taste and texture. The frozen meal is increasingly popular in time-starved American households. If the meal can be heated in a microwave, total time from freezer to table can be less than five minutes.
Besides offering fresh taste and convenience, freezing is also a safe method of preservation, as most pathogens are inactivated at low temperatures. The frozen food industry dates back to the early years of the twentieth century, when some foods were preserved by the so-called cold-pack method. Food handlers would wash and sort fruits or vegetables, then pack them in large containers holding from lb kg. The large containers were placed in a cold storage room for several days until the mass was frozen solid.
Cold pack foods did not have the quality of modern frozen foods because of the time it took for the food to freeze. In slow freezing, the water in the food crystallizes, forming large needles of ice. These shards of ice destroy cells walls, and so when the food is thawed, it has deteriorated in taste and texture.
The innovation that made the current frozen food industry possible was the invention of quick freezing by Clarence Birdseye. Birdseye was born in Brooklyn, New York, in and studied biology at Amherst College before drifting to the Canadian Arctic to work as a fur trader and trapper. Living with his family in a remote Labrador cottage, Birdseye became fascinated with freezing food, and he experimented with many kinds of meats and vegetables.
Birdseye noted that freshly caught fish that froze in seconds in the sub-zero arctic air tasted perfectly palatable when later thawed and cooked. He experimented with quick-freezing other foods, including fruits and vegetables, and soon became convinced that he had a viable commerical venture. Birdseye returned from Canada in and devoted himself to inventing a mechanical freezing device.
He won his first patent in , and established a frozen fish company in New York in His first frozen food business failed to spark interest, and a second company he founded in Gloucester, Massachusetts also withered. Yet Birdseye continued to develop new freezing technology, decreasing the time it took to freeze foods.
In , the General Foods Corporation bought out Birdseye's enterprise, paying an enormous sum for his patents. General Foods made an intensive marketing push, installing freezers in grocery stores and developing freezer rail cars for long-distance distribution. Though American families still scoffed at frozen foods, the company began to make inroads with commercial food preparers such as hospitals and schools. American soldiers ate frozen foods during World War II, and after the war, the industry took off.
Home freezers grew larger, and more and more items, from vegetables to pizzas to entire meals, became available in grocery stores.
Later he developed a so-called belt froster. This passed packages of food between two sub-zero metal surfaces, and so cooled top and bottom at the same time.
This greatly decreased the time it took to freeze foods. Another innovation attributed to a General Foods scientist was the process of blanching vegetables before freezing. Blanching entailed immersing the vegetables in boiling water for a few minutes to halt the activity of certain enzymes. This preserved their flavor much more effectively. Current methods of freezing typically use the air blast method, where ultra-cooled air is blown on the food in a narrow tunnel, or by the indirect method, where the food is passed along metal plates cooled by a refrigerated liquid.
Food can also be frozen cryogenically. After the food exits the cryogenic tunnel, heat from the core of the food permeates to the outside, resulting in a final stable frozen state.
Some products also use an immersion method. For foods with a viscous sauce or sticky surface, the surface might be immersed in an ultra-cooled liquid for only a few seconds, and then the food can be frozen by air-blasting. Optimal freezing methods vary considerably with each food product.
And not every food freezes well. Certain varieties of peas or strawberries for example have been found to freeze best. This might be because of their firm texture or specific sugar content. So farmers will grow these special varieties under contract with a frozen food company. The raw materials for frozen foods include whatever is to be frozen, e. In most cases, the food is specifically cultivated or adapted for freezing. In the case of frozen desserts such as cakes and pies or entrees such as meat loaf and gravy, the recipe must be tested and altered so that it freezes well.
Large companies will order optimum ingredients according to standards they have established during their product testing. For example the noodles used in a frozen pasta entree may be ordered in bulk from a distributor that makes them in a certain specified width or viscosity or flour content according to the precise need of the frozen food manufacturer. In this respect, ingredients in a frozen meal may differ from what a home cook would buy at the supermarket.
But in general, frozen foods do not require a host of extra ingredients such as preservatives. Added ingredients are most frequently thickeners and stabilizers such as starch, xanthan gum, and carrageenan.
These help retain the desired texture of the food after thawing. Recipes for foods destined for the freezer may also do better with the addition of a sauce or glaze, because this protects the food from dehydration when it is passed under the freezing air blast. Vegetables or fruits destined for freezing may also be picked at a different time than they would be if they were to be sold fresh, because they need to be at optimal tenderness.
The freezing equipment is typically made from stainless steel and other metals. The gas used for freezing is most commonly ammonia. Freon is used in some systems, though because it breaks down the ozone layer, ammonia is more environmentally sound.
Cryogenic freezing uses liquid nitrogen. The actual process of freezing a food item varies somewhat depending on what is to be frozen. Peas are the most common frozen vegetable, having virtually replaced fresh peas in the American supermarket.
The pea process is typical for many vegetables. Clarence Birdseye. Born in Brooklyn, New York, Clarence "Bob" Birdseye attended Amherst College for two years before leaving in in order to indulge his spirit of adventure by fur-trading and trapping in Labrador, Canada.
Birdseye returned to Labrador in with his new wife and infant. In order to preserve the few fresh vegetables that found their way to Labrador by ship, Birdseye began experimenting with the Eskimo method of quick-freezing foods. He stored fresh cabbages in a barrel with sea water which froze quickly in the subzero Arctic climate.
Birdseye also experimented with quick-freezing fish and caribou meat. When thawed, these foods remained tender and fresh-flavored, unlike previous methods involving slow cold storage. Birdseye returned to the United States in determined to develop commercial methods of rapid freezing, experimenting with an electric fan, cakes of ice, and salt brine. In , he invested everything he had in Birdseye Seafoods, marketing frozen fish.
In , he and three partners founded General Seafoods in Gloucester, Massachusetts, which became the first company to use the technique of rapid dry freezing of foods in compact, packageable blocks. The company renamed itself General Foods and marketed its frozen foods under the Birds Eye trademark. After the sale, Clarence Birdseye devoted himself to more inventing, obtaining over patents, including ones for an infrared heat lamp, a whale-fishing harpoon, a method of dehydrating foods, and a spotlight for store window displays.
Frozen foods must be carefully inspected both before and after freezing to ensure quality. When vegetables arrive at the processing plant, they are given a quick overall inspection for general quality. The peas are inspected visually again as in step five, above, to make sure that only the appropriate quality peas go on to the packaging and freezing step.
Laboratory workers also test the peas for bacteria and foreign matter, pulling random samples from the production line at various points.
The packaged, frozen vegetables are also tested randomly by lab workers who cook and taste them. The freezing equipment is also cleaned at specified intervals, so that it is completely sterile.
Manufacturers of freezing equipment work with food producers to develop machines that are easy to clean and maintain. The equipment manufacturers may also work with their customers to check and repair the machinery so that it works the way it is supposed to.
For frozen meals, if any meat is used, the U. Department of Agriculture has oversight, and will send inspectors to make sure the manufacturer is maintaining its equipment properly and that the meat is kept at proper temperatures throughout the production process. However, if a frozen meal contains no meat, it is up to the manufacturer itself to maintain ideal conditions, and no government agency is directly responsible for quality control.
In the late s, the frozen food industry was expanding both within the U. The industry's biggest push was so-called home meal replacement, that is, whole frozen meals that took the place of cooking from scratch.
More consumers were willing to trade the convenience of a frozen meal for the satisfaction of making their own dinner from fresh foods. This meant that the industry was challenged to come up with more elaborate frozen dishes, which required more testing and experimentation to pull off than the relatively simple frozen vegetables or waffles.
Food scientists are still working out the chemistry and physics of frozen foods, studying for example the relationship between low-molecular weight sugars and high-molecular weight stabilizers in a recipe in order to better predict what foods will freeze well.
Cryongenic freezing is also a relatively new freezing method that may be gaining adherents. As not all foods benefit from being frozen this way, some equipment manufacturers are designing multiple-use machines that combine freezing methods.
Rice, Judy. Smith, Brian. Toggle navigation. Other articles you might like:. Follow City-Data. Tweets by LechMazur. User Contributions: 1. It is good to know that the vegetables and fruit are frozen before packaging. My concern is the packaging, specifically PBA in the plastic package. And why is salt and sugar added?
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Food Manufacturing Industry
Frozen foods are ubiquitous in American supermarkets, and are increasingly a part of the food industry worldwide. Fruits and vegetables are usually frozen within hours of being picked, and when thawed, they are very close to fresh in taste and texture. The frozen meal is increasingly popular in time-starved American households. If the meal can be heated in a microwave, total time from freezer to table can be less than five minutes. Besides offering fresh taste and convenience, freezing is also a safe method of preservation, as most pathogens are inactivated at low temperatures. The frozen food industry dates back to the early years of the twentieth century, when some foods were preserved by the so-called cold-pack method.
Account Options Anmelden. E-Book — kostenlos. Annual Report of the Commissioner of Patents. United States. Patent Office. Prior to , when the Department of Agriculture was established, the report on agriculture was prepared and published by the Commissioner of Patents, and forms volume or part of volume, of his annual reports, the first being that ofSEE VIDEO BY TOPIC: How Does Canned Food Last So Long? - Earth Lab
This website uses non-intrusive cookies to improve your user experience. You can visit our cookie privacy page for more information. Beta This is a new way of showing guidance - your feedback will help us improve it. Food and drink manufacturing takes place in factories ranging from small units with few workers to large factories which may be part of multi-site organisations employing thousands. The food and drink manufacturing industry actually comprises over 30 different sectors. The largest of these is the bakery sector followed by meat processing, drinks industries, dairies, animal feed and fish processing. Health and Safety Executive. Back to. About food and drink manufacture.
Food Manufacturing on a Mission
If you are planning to start a gourmet food store business, you can rest assured that it is a wise decision on your part. Starting this business is not only easy but also profitable as well. However, to make this venture a success, you must first have to prepare a comprehensive gourmet food store business plan.
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The main objective of canning is to obtain a shelf-stable product that can be stored in suitable containers for a considerable length of time at least two years without undergoing food spoilage, while retaining desirable nutritional and sensory qualities. In the following descriptions of the processing stages for various products, operations which are similar are described in Chapter 4. The description is related to canning plant with a capacity of 20 tons whole raw fish bluefin or yellowfin tuna per 8 hours.
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