Churning (butter) 2609061 225318014 2008-07-13T01:49:26Z 203.173.16.65 [[Image:Butternpeng1.jpg|thumb|230px|Farmer selling the churned butter (machine in the foreground).]] '''Churning''' is the process of shaking up [[whole milk]] (or [[Cream (food)|cream]]) to make [[butter]], and various forms of [[butter churn]] have been used for the purpose. In [[Europe]] from the [[Middle Ages]] until the [[Industrial Revolution]], this was generally as simple as a barrel with a plunger in it, which was moved by hand. Afterward, mechanical means of churning were usually substituted. == Butter churning == Butter is essentially the fat of milk. It is usually made from sweet [[cream (food)|cream]]. In the USA, [[salt]] is usually added to it. Unsalted (sweet) butters are most commonly used in Europe. However, it can also be made from [[acidulated]] or bacteriologically soured cream. Well into the 19th century butter was still made from cream that had been allowed to stand and sour naturally. The cream was then skimmed from the top of the milk and poured into a wooden tub. Buttermaking was done by hand in butter churns. The natural souring process is, however, a very sensitive one and infection by foreign [[micro-organisms]] often spoiled the result. Today's commercial buttermaking is a product of the knowledge and experience gained over the years in such matters as [[hygiene]], bacterial acidifying and heat treatment, as well as the rapid technical development that has led to the advanced machinery now used. The commercial cream separator was introduced at the end of the 19th century, the continuous churn had been commercialized by the middle of the 20th century. == The creation process == [[Image:Leeds butter churn.jpg|thumb|200px|A barrel-type butter churn.]] Changing [[Whole Milk|whole milk]] to butter is a process of transforming a fat-in-water [[emulsion]] ([[milk]]) to a water-in-fat emulsion ([[butter]]). [[Whole Milk|Whole milk]] is a dilute emulsion of tiny fat globules surrounded by lipoprotein membranes that keep the fat globules separate from one another. Butter is made from cream that's been separated from whole milk and then cooled; fat droplets clump more easily when they’re hard rather than soft. However, making good butter also depends upon other factors, such as the fat content of the cream and its acidity. The process can be summarized in 3 steps: # Churning physically agitates the cream until it ruptures the fragile membranes surrounding the milk fat. Once broken, the fat droplets can join with each other and form clumps of fat, or butter grains. # As churning continues, larger clusters of fat collect until they begin to form a network with the air bubbles that are generated by the churning; this traps the liquid and produces a foam. As the fat clumps increase in size, there are also fewer to enclose the air cells. So the bubbles pop, run together, and the foam begins to leak. This leakage is called [[buttermilk]]. # The cream separates into butter and buttermilk. The buttermilk is drained off, and the remaining butter is kneaded to form a network of fat crystals that becomes the continuous phase, or dispersion medium, of a water-in-fat emulsion. Working the butter also creates its desired smoothness. Eventually the water droplets become so finely dispersed in the fat that butter’s texture seems dry. Then it is frozen in to cubes, then melted, then frozen again into bigger chunks to sell. For more information, see [http://webexhibits.org/butter/process-steps.html WebExhibits.org]. == Types of Butter Churns == Butter churns have varied over time as technology and materials have changed. # First butter was made by placing the cream in a container made from animal material. Later wood, glass, ceramic or metal and shaking until the milk has broken down in to butter. # The early butter churns used a wooden container and a plunger to agitate the cream until butter formed. # The later butter churns use container made from wood, ceramics or galvanised(zinc coated) iron that contain paddles. The hand turn paddles are moved through the cream quickly. Breaking the cream up by mixing it with air. This allows the butter to be made faster then agitating the cream. # After the invention of centrifugal cream separators. The properties centrifuge is applied to butter churns. Were instead of having spinning paddles, the paddles are fixed and the container spins. This allowed better separation of the butter from the butter milk and water. With electric mixers and food processors commonly available in most house holds kitchens. They are used to mix the cream until it is close to forming solid butter. Then mixed by hand to remove the butter milk and water. == Historical reference == [[Image:Butter1web.jpg|thumb|left|150px|Churning butter (photo taken in 1944)]] The ''Household Cyclopedia'' of 1881 instructs: <blockquote>"Let the cream be at the temperature of 55° to 60°, by a Fahrenheit thermometer; this is very important. If the weather be cold put boiling water into the churn for half an hour before you want to use it; when that is poured off strain in the cream through a butter cloth. When the butter is coming, which is easily ascertained by the sound, take off the lid, and with a small, flat board scrape down the sides of the churn, and do the same to the lid: this prevents waste. When the butter is come the butter-milk is to be poured off and spring water put into the churn, and turned for two or three minutes; this is to be then poured away and fresh added, and again the handle turned for a minute or two. Should there be the least milkiness when this is poured from the churn, more must be put in.</blockquote> <blockquote>"The butter is then to be placed on a board or marble slab and salted to taste; then with a cream cloth, wrung out in spring water, press all the moisture from it. When dry and firm make it up into rolls with flat boards. The whole process should be completed in three-quarters of an hour. In hot weather pains must be taken to keep the cream from reaching too high a heat. If the dairy be not cool enough, keep the cream-pot in the coldest water you can get; make the butter early in the morning, and place cold water in the churn for a while before it is used."</blockquote> ==External links== * [http://webexhibits.org/butter/ WebExhibits.org -- Very complete research document on butter] [[Category:Butter]] [[de:Buttern]] [[id:Churning (butter)]] [[he:חיבוץ]] [[nl:Karnen]]