US1505170A - Method of grinding - Google Patents

Description

S. STEINMETZ METHOD oF GRINDING Aug., w 1924ia Filed Auz. 26 1921 Patented Aug. 19, 1924.

PATENT OFFICE.

STEFAN STEINMETZ, F BERLIN, GERMANY.

METHOD or Gamme.

Applicatin led August 26, 1921. Serial No. 495,528.

To all whom 'it may concer/n.:

Be it known that I, STEFAN STEINMn'rz, a citizen of the German Republic, and a resident of Berlin Germany, have invented a Lt certain new an useful Improved Method of Grindin (for which I have obtained a patent in ermany, No. 311,271, October 11, 1917), of which the following is a specnication. 1

The diiiculty of breaking up bran into,

property of the bran to offer, if to be converted into a very fine powder, a resistance which is the greater the more the state of the bran 'durlng the reduction approaches the Hour-free state. The cause for this phenomenon resides in the bran assummg gradually the form of thin and curved lamelles which easily slip through the grinding path in general and the grinding furrows in particular. l The invention is based upon the cognizance that two features promote the transformation of bran into powder, viz:

1. The grinding process must be such that, first, the bran remains preserved in the form of as large scales as possible, because in this case the coarseness of the flour produced from the bran'remains tangible and the starchand gluten-cells are protected from destruction .impairing their germinating power.

2. When the bran has been obtained in this known manner, it is converted into a very fine powder by two separate mechanical steps consistin in the bran being rst cut to ieces and en ground down. This may, i desired or necessary, be continued until the bran has attained a degree of fineness which `is even greater than that of the coreflour already obtained.

This manner of operation is preferably carried through by means of disk-mills, the disks of which rotate in op-posite directions. The' grinding disks should be covered with pieces of hard cast iron or another suitable material and said pieces should have furrows or ripples provided with sharp, bladelike teeth a apted to act like scissors and to cut the bran to pieces. The sifting after the cutting must be so line already that only the by far smallest particles pass through.

The remaining particles are preferabl introduced into another mill of the same d, but having the disks covered with emery, or with plates of tangible coarseness, by which the pre-worked bran is completely ground down. The two mills may be combined to one. Sifting the product Aafter the two workin phases mentioned is preferably effected y air currents carrying away only the finest particles of the bran, but instead of this means ad uately fine sieves may be made use of. 'I e fineness of the grinding down, controlled b the fine siftin warrants extracting t e nutrients stil conaliied in the bran, as well as their digesti- In order to make my invention more clear I refer to the accompanying drawing which explains rather diagrammatically `the transformation of bran into bran dust by means of a disk mill having a double disintegrating surface. Figure 1 is a vertical transverse section through the mill and shows chiefly a plan of one of the grindin disks; Figure 2 is a vertical longitudina section through this mill.

After the grainhas been freed, preferably on the wet Way, from its cuter straw skin and the flour core has been extracted y the ordinary grinding procedure, the bran remaining from this procedure is introduced through the hopperv 1 into the mill, the disks 2 and- 3 of which-rotate in opposite directions and are covered with concentric inding rings 4, 6 and 5, 7 The rings 4 and 5 are rippled and work together llke a pair of scissors so that they actually cut the bran. The grinding rings 6 and 7, however, which consist of emery or an equivalent material reduce the cut bran particles to dust which then is conducted to a pneumatic sifter 8 or to a sifting machine having adequately ne sieves. The remainders are re-conducted into the mill through the passage 9 where they are treated a second time, and this is, or may be, repeated until the bran has, so to say, been ound dead. The other ortion of the dust 1s retained after each si ing and the whole, or, may be, solely its nutritious componente separated from it by siftin are, finally added to the flour intended or the Having now described my invention, what I desire to secure by n. patent of the United igl'rinding the cut lamelles or scales to' most States is: nely divided powder. 10

The process of obtaining the nourishing In testimony whereof I aix my signature `partic1es in bran, consistin' in vfirst separatin presence of two witnesses.

5 mg the bran from the gram in the form of STEFAN STEINMETZ.

scales or lamelles, seoondl cutting these Witnesses: scales or lamelles to brin t em into a form Orro T. BRUNN,

other than scales or lame las, and thereafter PAUL Bumm).

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