Патент USA US3080135код для вставки
March 5, 1963 3,080,125 JlYUlCHI NARA PROCESS FOR MANUFACTURING WHEAT FLOUR Filed Sept. 20. 1960 #/-4 24 Ff} / \\ Bran-Free Fina Flour ——> 7 /6 Fly 4 Air Suspended F[our From Sift” M Bran Contain/0g \i‘oaru 1N VEN TOR. J IYUIC HI NARA BY WA TTORN United States Patent 0 ice 3,080,125 Patented Mar. 5, 1963 2 1 First, as shown in FIG. 1, the wheat grains are fed from the feeder F to the ?rst impact pulverizer 1P which is run at a comparatively slow speed to crush the germs 3,080,125 PROCESS FOR MANUFACTURING WHEAT FLOUR Jiyuichi Nara, 80 Samezucho, Ooi, Shinagawa-ku, Tokyo, Japan to the least possible degree. This is possible because the germs contain much fat so that they are not so easily crushed as other portions of the grains. _ Filed Sept. 20, 1960, Ser. No. 57,337 3 Claims. (Cl. 241-11) Secondly, the coarse ?our from the pulverizer 1? is ted to a series of sitters 18, 28, 3S . . . LS arranged in This invention relates to a process for the manufac sequence. The meshes of these sitters are made coarser by order from 18 onwards. For instance, the mesh of ture of wheat ?our, and consists in crushing the wheat ‘the ?rst sitter 18 is 120, and those of 28, 35, 4S . . . etc. grains, separating the germs from the crushed substance, are made 60 mesh, 50 mesh, 40 mesh . . . etc. respectively, further separating therefrom a coarse ?our mixed with as indicated upon FIG. 1. So far as the last two sitters bran and another coarse bran-free ?our, then giving both 5S and LS are concerned, the former is made 30 mesh these coarse ?ours a further crushing and sieving opera through which germs cannot pass, whereas the latter is tion of each individually diiterent system, and ?nally 0b 15 made 16 mesh enabling germs to pass through it. taining re?ned ?our containing no germ and bran and The overs of the ?rst sitter 18 are fed to the second only the germs separately. In the ?our industry hither sitter 28, the overs ot the second sitter to the third to, wheat ?our is obtained usually containing some amount sitter 3S, and also those of the third sitter to the fourth of bran or germs to a degree causing variations in qual 20 sitter, and those of the fourth sitter to the ?fth sitter ity of the ?our. in sequence. In this manner, all the overs are fed to According to the present invention wherein impact each succeeding sitter so that at length the ?our contain pulverizers are employed, re?ned ?our without bran pow ing a large percentage of germs is fed to the last sitter der or germ powder is obtained. First, the wheat grains are crushed by an impact-type pulverizer rotating at a speed which does not eitect crush ing of the germs. The coarse ?our thus obtained is to a series of sitting apparatus which are connected gether in sequence. Each sitting apparatus has a quentially coarser mesh. By means of these sitting as overs ot the sitting meshes and the meshes ot the last two sifting apparatus connected adjacently are made 30 mesh per square inch and 20 to 16 mesh per square inch respectively. In general, wheat germs are of a size to pass screens of According to the present invention, the coarse ?our containing the largest quantity of germs is obtained as unders ot the sitting ap paratus 0t 20 to 16 mesh. Subsequently, this coarse flour is directed to an air separator so that the bran con~ tained in it can be removed after the ?our has passed through the separator. Then the coarse ?our thus made, free from bran, is subjected to, the operation of a roller type pulverizer. The unders ot the mesh of the last sitter LS are subjected to the operation of‘ the air separator AS once so that the coarse ?our containing the largest quantity of germs and bran only or the same mixed with flour can be sep arated from each other by means of ditterence in air fed to se ap 30 resistance. paratus the coarse ?our mixed with germs is pulverized from 30 to 16 mesh per square inch. LS to cause the germs to pass through its mesh. In this manner, the coarse ?our of around 30-16 mesh containing the largest quantity of germs is collected. This ?our then is subjected to the opera tion of the pulverizer RP comprising a pair of rollers, for giving a compressing effect on the coarse flour. By 35 this means the germs are merely compressed, but the ?our except the germs is crushed until it is ?nely divided or pulverized. Therefore, the flour passing throughthe roller-type pulverizer RP can be separated by sitting means without being subjected to the operation of an air separator, that is, by a sitter such as those disclosed at col. 4, line 64 of Patent 2,392,365, e.g. a rotating sitter RS or a vibrating sitter by which the overs ot the mesh of the sitter consist of compressed germs only whereas the unders of the mesh of the sitter become a wheat ?our in coarse form. Therefore, the germs alone are collected independently and the coarse flour under the sitter is fed to the impact pulverizer 2'1’ Since germs contain plenty of fat, they are not exten sively crushed or pulverized, but are merely compressed. At the same time, the pulverized ?our except the germs and then sieved out through the sitters 68, 75, 88 etc. is crushed. After this operation the resulting substance Further, the ?our is repeatedly crushed by the impact is separated into compressed germs and a ?nely divided pulverizers 3’P, 3P, 4? etc. so that re?ned flours (#1-2), 50 ?our by means of such separator as is capable of sitting (#1-3), (#14), a second ?our 2a, 2b and a third ?our the material only by means of difference in meshes, e.g. (#3) are obtained. On the other hand, as for the un a rotating or vibrating sitter so that the germs are ?nally ders ot the sitters 18, 28, 35 etc. those of the sitter 18 obtained, and the ?nely divided flour is further subjected of 120 mesh are collected as re?ned ?our (#1-1). All to another crushing and sitting so that a re?ned flour, 55 the unders of the sitters 38, 48, etc. are ted to respective a second ?our and a third ?our are obtained respectively. The above mentioned unders ot the meshes of the group of sitting apparatus are separated by means of an air separator into flour containing a great deal of bran and another bran-tree ?our. Then, after giving each indi air separators AS once so that they are separated into bran containing coarse ?our and .a ?ne ?our containing no bran. Then the former is fed to the cyclone col lector CY equipped with the fan BL, as shown by broken so that it is crushed again by the impact pulverizers vidually different crushing and separating operation to 60 lines, 4P, SP‘ and the sitters 145, 158 and v16S for another these two kinds of flour in a repeated manner, a re?ned separation, thereby obtaining a second ?our 2b, a third ?our (#3), Bran LB and Bran powder SB. Moreover, separately. as has been explained above, the ?ne ?our containing The invention will be explained in detail with the ac no bran, sent out from the air separators AS, is again companying drawings wherein; FIG. 1 is a general view 65 crushed by the second impact pulverizer 2"P, after which ?our, a second ?our and a third ?our are also obtained showing the whole apparatus of the present invention. it is sequentially crushed and separated by the impact FIG. 2 is a view showing an example of an impact pul~ pulverizer 2P, 3P and sitters 68, 78, 88, etc. thereby verizer used in the present invention. FIG. 3 is a side obtaining a second ?our 2a, a third ?our (#3), Bran view in elevation of a sitter used in the present inven 70 LB and Bran powder SB. The ?gures given in FIG. 1 tion. FIG. 4 is a side view in elevation of an air separa beneath each reference character 15, 23, 35, etc. indicate tor of this invention. 3 3,080,125 the, numbers of_ the meshes per inch of the respective sifters. The process according to the present invention pro vides that the wheat grains are crushed by. the ?rst crusher 1P running at a speed which does not pulverize the germs, and the substance crushed to this extent is fed to a series of sitters 18, 23, 35, thus developing as 4 crushing the. grain, sequentially passing the crushed grain through a ?rst series of sifters of mesh size increasing from 120 to 60, 50, 40, 30 and 16, in'the order men tioned, passing the unclers from each said ?rst series of sifter from 50- down to 30-mesh, to respective air sepa rators to remove bran therefrom, passing the unders from said 16-mesh Sifter to a discrete air separator to remove the overs of the mesh of each sitter and then, they are bran therefrom and obtain germ, compressing the germ further passed through the last sitter LS so that they are output of said discrete air separator in a roller type pul collected as the unders of the last sifter having between verizer, sifting the compressed germ to thus obtain germ 30 and 16 mesh. Then, this ?our is fed to the air separa 10 and bran-free ?our, and passing the bran-free ?our from tor AS, so that it is made free from bran mixed with it. all the aforesaid air separators and sittings from said After this operation, it is subjected to. the operation of the compressed germ, to a common, ?rst impact pulverizer, to roller-type, pulverizer so that the germs alone are com thus discrete bran-free ?our, bran and germ. pressed, and simultaneously the ?our except the germs 2. The process of claim 1, including passing the unders isagain crushed, after which the compressed germs only 15 of said 60-mesh sifter, together with the overs from said are separated according to granular size, by means of 16-mesh sifter to a second impact pulverizer, and sitting sitters, and also the unders of the mesh of the above the output from said second pulverizer to obtain a second mentioned sifters 18, 25, 38 etc. are separated into a supply of bran-free ?our. coarse flour and bran mixed with ?our, and both these 3. The process of claim 2, including conducting the 20 kinds of ?our are further crushed and separated. overs from said last mentioned sifting, sequentially to a FIG. 2 indicates a known example of an impact pul second series of sifters of mesh sequentially decreasing verizer, which is used also in the operation of the pres from 100- to 60- to 40- to BO-mesh, passing the unders ent invention. Reference 1 indicates a rotating disc, 2 a from said 40- and Bil-mesh Sifters of said second series, strike pin, 3 a ?xed disc, 4 a strike pin, 5 an inlet for 25 to respective air separators, to obtain a third supply of ?our material and 6 an outlet for ?our. FIG. 3 shows a sitter in which reference '7' indicatesa cylindrical jacket, 8 a, sieve, a rotatable shaft, 1%) a radial lever, 11 a motor for rotating shaft 9, 12 a powder inlet, 13 an outlet for the overs of the sieve, and 14 an outlet for the unders of the sieve. FIG. 4 shows an air sep 30 arator, in which reference 15 indicates a jacket, 16 a blow-up pipe for mixing flour and air, 17 an outlet pipe for ?our subjected, to large air resistance, and 18 an out, let pipe for ?our subjected to small air resistance. The 35 characteristics involved in the present process are that germs, and ?our containing no germ or bran can be bran-free ?our, passing said third supply of bran-free ?our to a third impact pulverizer and sifting the residue from said third pul-vcrizer in a l20~mesh sitter. References Cited in the ?le of this patent UNITED STATES PATENTS 2,392,365 2,464,212 2,847,167 2,879,004 Carter ____ _____________ __ Ian. 8, Carter ______________ __ Mar. 15, Szasz ________________ __ Aug. 12, Dodds ______________ __ Mar. 24, 1946 1949 1958 1959 OTHER REFERENCES The Pin Mill and Spiral Air Classi?er by W. H. Gellich What is claimed is: in American Miller and Processor, September 1958, pages 1. The process of milling wheat, comprising, lightly 4017, 18 and 35. obtained separately.