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Патент USA US3080135

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March 5, 1963
Filed Sept. 20. 1960
Ff} /
Fina Flour
Fly 4
Air Suspended
F[our From Sift”
Bran Contain/0g
United States Patent 0 ice
Patented Mar. 5, 1963
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
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
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
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.
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
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.
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
3’P, 3P, 4? etc. so that re?ned flours (#1-2),
?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,
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,
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.
the, numbers of_ the meshes per inch of the respective
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
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
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
Carter ____ _____________ __ Ian. 8,
Carter ______________ __ Mar. 15,
Szasz ________________ __ Aug. 12,
Dodds ______________ __ Mar. 24,
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.
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