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FLOUR
and FLOUR MANUFACTURE
.
The See also:term " flour " (Fr. fleur, See also:flower, i.e. the best See also:part) is usually applied to the triturated farinaceous constituents of the See also:wheat See also:berry (see WHEAT); it is, however, also used of other cereals and even of leguminoids when ground into a See also:fine See also:powder, and of many other substances in a pulverulent See also:state, though in these cases it is usual to speak of See also:rye flour, See also:bean flour, &c
.
The flour obtained from oats is generally termed oatmeal
.
In See also:Great See also:Britain wheaten flour was commonly known in the 16th and 17th centuries as See also:meal, and up to the beginning of the loth See also:century, or perhaps later, the term mealing See also:trade was not infrequently used of the milling trade
.
The ancestor of the millstone was apparently a rounded See also:
In the same way the See also:Omahas pound this cereal in holes in the
rocks, while the See also:Oregon Indians parch and pound the capsules
of the yellow See also:lily, much after the See also:fashion described by See also:Herodotus
in his See also:account of the See also:ancient Egyptians
.
In See also:California the
See also:Indian squaws make a sort of paste by crushing acorns between
a round stone or " See also: It is known as the metata, and is used both for grinding maize and for making the maize cakes known as tortillas . The same implement is apparently still in use in some parts of See also:South America, notably in See also:Chile . According to Richard Bennett, the quern,. the first See also:complete milling mathine, originated in Italy and is in all See also:probability not older than the and century B.C . This is, however, Quern. a controverted point . Querns are still used in most primitive countries, nor is it certain that they have altogether disappeared from remoter districts of See also:Scotland and Ireland . Whatever was their origin, they revolutionized flour milling . The rotary motion of millstones became the essential principle of the trituration of grain, and exists to-day in the rolls of the See also:roller mill . The early quern appears to have differed from its descendants in that it was soniewhat globular in. shape, the See also:lower stone being made conical, possibly with the See also:idea that the ground flour should be provided with a downward flow to enable it to fall from the stones . This type did not, however, persist . Gradually the convexity disappeared and the surface of the two stones became See also:flat or very nearly so . In the upper stone was a See also:species of See also:funnel, through which the grain passed as through a hopper, making its way thence, as the stone revolved, into the space between the See also:running and the ' See also:bed stone . The ground meal was discharged at the periphery . The runner, or upper stone, was provided with a wooden handle by which the stone was revolved: The typical See also:Roman mill of the Augustan See also:age may' be seen at See also:Pompeii . Here, in what is believed to have been a public pistrinum or mill, were found four pairs of mill-stones . The circular See also:base of these See also:mills is 5 ft. in See also:diameter and i ft. high, and upon it was fastened the See also:meta, a See also:blunt See also:cone abbut 2 ft. high, on which fitted the upper millstone or catillus, also conical . These mills were evidently rotated by slave labour, as there was no See also:room for the=perambulation of a See also:horse or donkey, while the See also:side-lugs in which the handle-bars were inserted are plainly visible . Slave labour was generally used up to the introduction of See also:Christianity, but was finally abolished by the See also:emperor See also:Constantine, though even after his See also:edict mills continued to be driven by criminals . The Romans are credited by some authorities with having first applied See also:power to the See also:driving of millstones, which ; they connected with See also:water-wheels by a See also:horizontal spindle through the intervention of See also:bevel gearing . But See also:long use of pliWer . after millstones had been, harnessed to water power slave labour was largely employed as a See also:motive force . The water-mill of the Romans was introduced at a relatively early period into Britain . Domesday See also:Book shows that See also:England was covered by mills of a. See also:kind at the See also:time of the See also:Norman See also:conquest, and mentions some Soo mills in the counties of See also:Norfolk and See also:Suffolk alone . No doubt the mike of Domesday Book consisted of one pair of stones connected by rude gearing with a water-See also:wheel . Windmills are said to have been introduced by the Crusaders, who brought them from the See also:East .
See also:Steam power is believed to have been first used in a British flour mill towards the See also:close of the 18th century, when See also:Boulton & See also:Watt installed a steam See also:engine in the See also:Albion Flour Mills in See also:London, erected under the care of See also: See also:Turner, of See also:Ipswich, began to build roller mills for breaking wheat as a preliminary to the See also:conversion of the resultant middlings on millstones . The rolls were made of chilled See also:iron and were provided with serrated edges, which must have exercised a tearing See also:action on. the integuments of the berry . These mills were built to the See also:design of a See also:German engineer, of the name of G . A . See also:Buchholz, and were exhibited at the London See also:exhibition of 1862, but they never came into See also:general use . It has also been stated that as early as 1823 a See also:French engineer, named See also:Collier, of See also:Paris, patented a roller mill, while five years later a certain See also:Malar took out another French patent, the See also:specification of which speaks of grooves and See also:differential speeds . But the direct ancestors of the roller mills of the See also:present day were brought out some time in the third See also:decade of the 19th century by a Swiss engineer named Sulzberger . His apparatus was rather cumbrous, and the chilled iron rolls with which it was fitted consumed a large amount of power relatively to the work effected . But the Pester Walz-Mtihle, founded in 1839 by See also:Count See also:Szechenyi, a Hungarian nobleman, which took its name from the roller mills with which it was equipped by Sulzberger, was for many years a great success; some of its roller mills are said to have been kept at work for upwards of See also:forty years, and one at least is preserved in the museum at See also:Budapest . It may be noted that Hungarian wheat is hard and flinty and well adapted for treatment by rolls . Moreover, See also:gradual reduction, as now understood, was more or less practised in Hungarian See also:Hungary, even before the introduction of roller practice, milling . Though millstones, and not rolls, were used, yet the, wheat was not floured at one operation, as in typical See also:low or flat grinding, but was reduced to flour in several successive operations . In the first break the stones would be placed just wide enough apart to " end " the wheat, and in each succeeding operation the stones were brought closer together . But Hungarian milling was not then automatic in the sense in which British millers understand the word . For a long time a great See also:deal of hand labour was employed in the See also:merchant mills of Budapest in carrying about products from one See also:machine to another for further treatment . This practice may have been partly due to the cheap labour available, but it was also the deliberate policy of Hungarian millers to handle in this way the middlings and fine " dunst," because it was maintained that only thus could certain products be delivered to the machine by which they were to be treated in the perfection of See also:condition . The results were See also:good so far as the finished products were concerned, but in the See also:light of modern automatic milling the See also:system appears uneconomical . Not only did it postulate an inordinately large See also:staff, but it further increased the labour See also:bill by the demand it made on the number of sub-foremen who were occupied in classifying, largely by See also:touch, the various products, and directing the labourers under them . Hungarian milling still differs widely from milling as practised in Great Britain in being a longer system . This is due to the more See also:minute subdivision of products, a necessary consequence of the large number of grades of flour and offals made. in Hungary, where there are many intermediate varieties of middlings and " dunst " for which no corresponding terms are available in an See also:English See also:miller's vocabulary . It will be convenient here to explain the meaning of three terms constantly used by millers, namely, semolina, middlings and See also:duns' . These three products of roller mills are practically identical in See also:composition, but represent mld sedUnmo/'na,g,, different stages in the See also:process of reducing the endo- inst. sperm of the wheat to flour . A wheat berry is covered by several layers of skin, while under these layers is the floury See also:kernel or endosperm . This the break or grooved rolls tend to See also:tear and break up . The largest of these more or less cubical particles are known as semolina, whilst the See also:medium-sized are called middlings and the smallest sized termed dunst . The last is a German word, with several meanings, but is used in this particular sense by German and See also:Austrian millers, from whom it was doubtless borrowed by the pioneers of roller milling in England . If we were to See also:lay a See also:sample of fairly granular flour beside a sample of small dunst the two would be easy to distinguish, but See also:place a magnifying See also:glass over the flour and it would look very like the dunst . If we were to repeat this experiment on dunst and fine middlings, the former would under the glass present a strong resemblance to the middlings . The same effect would be produced by the putting side by side of large middlings and small semolina . This is a broad description of semolina, middlings and dunst . Semolina and middlings are more See also:apt to vary in See also:appearance than dunst, because the latter is the product of the later stages of the milling process and represents small particles of the floury kernel tolerably See also:free from such impurities . as See also:bran or fluff . The flour producing middlings must not be confounded with the variety of wheat See also:offal which is also known to many English millers as middlings . This consists of husk or bran, more or less comminuted, and with a certain proportion of floury particles adherent . It is only See also:fit for feeding beasts . The spread of roller milling on the See also:continent of See also:Europe was undoubtedly accelerated by the invention of See also:porcelain rolls, by See also:Friedrich Wegmann, a Swiss miller, which were brought into general use in the seventh decade of the 19th century, and are still widely employed . They are admirably fitted for the reduction of semolina, middlings and dunst into flour; and for reducing pure middlings, that is, middlings containing no bran or wheat husk, there is perhaps nothing that quite equals them .
They were introduced into Great Britain in 1877, or thereabouts, and were used for several years, but ultimately they almost disappeared from British mills
.
This was partly due to the fact that as made at that date they were rather difficult to work, as it was not easy to keep the rolls perfectly parallel
.
Another See also:drawback was their in-adaptability to over-heavy feeds, to which the British, and perhaps still more the See also:American, miller is frequently obliged to resort
.
However, since the beginning of the loth century some of the most advanced flour mills in England have again
Porcelain rolls
.
taken to using porcelain rolls for some part of their reduction process
.
The See also:birth of roller milling in Great Britain may be said to date from 1872, when Oscar Oexle, a German milling engineer,
Roller erected a set of roller mills in the Tradeston Mills,
m1/!mg in See also:Glasgow
.
This was long before the introduction of
In automatic roller mills
.
But the See also:foundations of the England millstone system were not seriously disturbed till 1877, when a party of leading British and Irish millers visited See also:Vienna and Budapest with the See also:object of studying roller milling in its native See also:home
.
In x878 J
.
H
.
See also:Carter installed in the mill of J
.
Boland, of See also:Dublin, what was probably the first complete automatic roller plant erected in the See also:United See also:Kingdom, and in 188r a milling exhibition held at the Royal Agricultural See also: From that time the roller system made great progress . By 1885 many of the leading British millers had installed full roller See also:plants, and in the succeeding ten years small roller plants were installed in many See also:country mills . For a time there was a transition See also:stage in which there was in operation a number of so-called " combined " plants, that is to say, mills in which the wheat was broken on millstones or disk mills, while the middlings were reduced by smooth rolls; but these gradually dropped out of being . Well-found British flour mills at the present time are probably the best fitted in the world, and as a whole have nothing to fear from comparison with their American competitors . It is true that American millers were rather quicker to copy Hungarian milling methods so far as gradual reduction was concerned . But from about 188o the British miller was quite awake to his position and was straining every See also:nerve to provide himself with a plant capable of dealing with every kind of wheat . It has often been said that he commands the wheat of the whole world . This is true in a sense, but it is not true that he can always command the exact kind of wheat he requires at the See also:price required to meet See also:foreign competition: Therein he is at a disadvantage . But engineers have done their best to meet this weak point, and by their assistance he is able to compete under almost all conditions with the millers of the whole world . Processes of Milling.—Fully to appreciate the various processes of modern milling, it must be remembered not only that the wheat as delivered at the mill is dusty and mixed with sand and even more objectionable refuse, but also that it contains many light grains and seeds of other plants . It is not therefore sufficient for the miller to be able to reduce the grain to flour on the most approved principles; he must also have at command the means of freeing it from foreign substances, and further of " conditioning " it, should it be See also:damp or over dry and harsh . Again, his operations must be conducted with reference to the structure of the wheat grain . The wheat berry is a See also:fruit, not a See also:seed, the actual seed being the germ or embryo, a See also:kidney-shaped See also:body which is found at the base of the berry and is connected with the plumule or See also:root . The germ is tough in texture and is in roller milling easily separated from the See also:rest of the berry, being flattened instead of crushed by the rolls and thus readily sifted from the stock . The germ contains a good deal of fatty matter, which, if allowed to remain, would not increase the keeping qualities of the flour . Botanists distinguish five skins on the berry—epidermis, epicarp, endicarp, episperm' and embryous membrane—but for See also:practical purposes the number of integuments may be taken as three . The inner skin is often as thick as the See also:outer and second skins together, which are largely composed of woody fibre; it contains the cerealin or aleurone cells, but although these are made up of a certain proportion of proteids, on account of the discolouring and diastasic action of the cerealin in flour they are best eliminated . The endosperm, or floury kernel, coming next to the inner skin, consists of See also:starch granules which are caught as it were in the minute meshes of a See also:net . This network is the See also:gluten, and it may be noted that these meshes are not of equal consistency throughout the berry, but are usually finer and more dense near the husk than in the interior of the kernel . This glutinous portion is of great importanceto the See also:baker because on its quantity and quality depends the " strength or rising power of the flour, and the aim of modern roller milling is to retain. it as completely as possible, a matter of some difficulty owing to its close adherence to the husk, especially in the richest wheats . Another See also:organ of the wheat berry which has a most important bearing on the work of the miller is the See also:placenta, which is in effect a See also:cord connecting the berry with its stalk or See also:straw . The placenta serves to See also:filter the See also:food which the plant sucks up from the ground; it passes up the crease of the berry, and is enfolded in the middle skin, being protected on the outer side by the first and having the third or inner skin on its other side . A good deal of the matters filtered by the placenta are See also:mineral in their nature, and such portions as are not digested remain in the crease . This is the matter which millers See also:call " crease dirt." It is highly discolouring to flour, and must be carefully eliminated . The fuzzy end of the berry known as the See also:beard also has a distinct See also:function; its hairs are in reality tubes which serve to carry off superfluous moisture . They have, in See also:common with the bran, no nutritive value . (See also WHEAT.) In the old " flat " or " low " milling the object was to grind as perfectly as possible, at one operation, the central substance of the grain, constituting the flour, and to See also:separate it from the embryo and outer skins constituting the bran . In " high " milling, on the other hand, the grinding is effected in a See also:series of operations, the aim being to get as much semolina and middlings as possible from the wheat, and to make as. little flour as possible during the earlier or " breaking " part of the process . It is impossible altogether to avoid the See also:production of flour at this stage, but properly set and worked break-rolls will make as little as 15% of " break-flour," which is of less value, being contaminated with crease dirt, and also because it is weak owing to the See also:absence of the gluten cells which adhere more readily to the middlings . Whole wheaten flour, some-times called See also:Graham flour, consists of the entire grain ground up to a See also:uniform See also:mass . Wheat cleaning has been well called the See also:foundation of all good milling . In the See also:screen See also:house, as the wheat-cleaning See also:department of the mill is termed, will be found an See also:array of machinery See also:Bry almost equal in range and variety to that in the mill ning itself . The wheat, See also:drawn by an elevator from the See also:barge, cle a or hoisted in sacks, is first treated by a machine known as a See also:ware-house separator . This apparatus accomplishes its work by means of flat See also:sieves, some of which will be of much coarser mesh than others, and of See also:air currents, the See also:adjustment of which is a more delicate task than might appear . The warehouse separator serves to free dirty wheat of such impurities as lumps of See also:earth, stones, straws and sand, not to mention small seeds, also some maize, oats and See also:barley . Great care has to be exercised in all operations of the screen house lest wheat should pass away with the screenings . Besides the warehouse separator, which is made in different types and sizes, grading and sorting cylinders, and what are known as See also:cockle and barley cylinders, are much used in the screen house . These cylinders are provided with indents so shaped and of such size as to catch seeds which are smaller than wheat, and reject grains, as of barley or oats, which are longer than wheat . Sorting cylinders should be followed by machines known as scourers, the function of which is to free the wheat from adherent impurities . These machines are of different types, but all depend on percussive action . A See also:vertical scourer consists of a number of See also:steel or iron beaters attached to a vertical spindle which revolves inside a metallic See also:woven or perforated casing, the whole being fitted with an effectual exhaust . Scourers with horizontal spindles are also in great favour . Not every wheat is suitable for scouring, but some wheats are so mingled with impuritiesthat a severe action between the beaters and the perforated See also:case is absolutely necessary . The most efficient scourer is that which frees the wheat from the greatest amount of impurity with a mini-mum of See also:abrasion . The beaters should be adjustable to suit different kinds of wheat . Scourers are followed by See also:brush machines which are similar to the last and are of three distinct types: solid, divided and cone brushes . In the solid variety the brush surface is continuous around the circumference of a revolving See also:cylinder; in divided brushes there is often a set of beaters or bars covered with brush but leaving intermediate spaces; while the cone brush consists of beaters covered with fibre arranged like cones around a vertical spindle . The object of all these brushes, the cylinder containing them being fitted with an exhaust See also:fan, is to See also:polish the. wheat and remove adhering impurities which the percussive action of the scourer may have failed to eliminate, also to remove the beard or fuzzy end and any loose portions of the outer husk . But the miller must be careful not to overdo the scouring action and unnecessarily abrade the berry, else he will have trouble with his flour, the triturated bran breaking under the rolls and producing powder which will discolour the break flour . To remove such metallic fragments as nails, pieces of See also:wire, &c., magnets are used . These may either be of horseshoe shape, in which case they are usually set at the See also:head of the wheat spouts, or they may consist of magnetized plates set at angles over which the wheat will slide . It is not a See also:bad See also:plan to place the magnets just before the first set of break-rolls; where they should ensure the See also:arrest of steel and iron particles, which might otherwise get between the rolls and spoil the edges of their grooves, and also do damage to the sifting machines . Mention must also be made of the automatic scales which are used to check the milling value of the wheat . In principle these machines are all the same, though details of construction may vary . Each weigher is set for a given See also:weight of grain . As soon as the receiving hopper has poured through a See also:valve into the recipient or skip, which is hung at one end of a See also:beam See also:scale, a load of grain sufficient to overcome the weight hung at the other end of the beam, the inlet of grain is automatically cut off and the skip is discharged, automatically returning to take another See also:charge . Each weighing is automatically recorded on a See also:dial . In this way a record can be kept of the See also:gross weight of the uncleaned wheat entering the warehouse and of the net weight of the cleaned wheat . The difference between the two weighings will, of course, represent the loss by cleaning . The percentage of flour obtained from a given wheat can be ascertained in the mill itself . In practice the second weigher is placed just before the first break . The cleansing of wheat by washing only became a fine See also:art at the close of the 19th century, though it was practised in the See also:north of England some twenty years earlier . Briefly it may be said Wet that certain wheats are washed to free them from extranecteantng ous matters such as adherent earth and similar impurities and See also:con- which could not be removed by dry cleaning wit |