Method and device having a simplified constructions for the reference grinding of wheat

1. A process for simplified production of a reference milling for determining a milling quality of wheat, comprising the steps of:

a first crushing (B 1 ) of a wheat sample into a crushed product;

a first sieving (T 1 ) of the crushed product into three distinct levels of particle size to produce four first products: oversize particles (Re), first-crushing coarse semolina, first-crushing fine semolina, and first-crushing flour (FB 1 );

a second crushing (B 2 ) of the oversize particles (Re) to produce crushed oversize particles;

a second sieving (T 2 ) of the crushed oversize particles into three distinct levels of particle size to produce four sorted second products: coarse bran (GS), second-crushing coarse semolina (Gs), second-crushing fine semolina and second-crushing flour (FB 2 );

a mixing of the first-crushing coarse semolina and the second-crushing coarse semolina to produce a mixture of coarse semolina;

a third crushing (C 1 ) of the mixture of coarse semolina to produce a crushed mixture of coarse semolina;

a third sieving (T 3 ) of the crushed mixture of coarse semolina into two distinct levels of particle size to produce three sorted third products: fine bran (FS), third-crushing fine semolina and third-crushing flour (FC 1 );

a mixing of the first-crushing fine semolina, the second-crushing fine semolina, and the third-crushing fine semolina to produce a mixture of fine semolina;

a fourth crushing (C 1 ) of the mixture of fine semolina to produce a crushed mixture of fine semolina;

a fourth sieving (T 4 ) of the mixture of fine semolina (Fs) into a single level of particle size to produce two sorted fourth products: sharps (Rem) and fourth-crushing flour (FC 1 ); and

a mixing of the first-crushing flour (FB 1 ), the second-crushing flour (FB 2 ), the third-crushing flour (FB 3 ), and the fourth-crushing flour (FB 4 ) to produce a milling (M).

2. The process according to claim 1 , further comprising:

a fifth crushing (C 2 ) of the sharps (Rem) to produce crushed sharps; and

a fifth sieving (T 5 ) of the crushed sharps into a single level of particle size to produce two sorted products: sharps bis (Rem′) and fifth-crushing flour (FC 2 ), wherein

the fifth-crushing flour (FC 2 ) is mixed together with the first-crushing flour (FB 1 ), the second-crushing flour (FB 2 ), the third-crushing flour (FB 3 ), and the fourth-crushing flour (FB 4 ) of the milling (M).

3. The process according to claim 1 , wherein the second sieving (T 2 ) and the first sieving (T 1 ) are both performed using a same sieving system.

4. The process according to claim 2 , wherein the fifth crushing (C 2 ) and the fifth sieving (T 5 ) are obtained by a repetition of the fourth crushing (C 1 ) and the fourth sieving (T 4 ) respectively, the fifth-crushing flour (FC 2 ) being added to the fourth-crushing (C 1 ) flour (FC 1 ).

5. The process according to claim 1 , wherein, for the first sieving and the second sieving, the three levels of particle size are approximately 200, 500 and 1000 microns, respectively.

6. The process according to claim 1 , wherein, for the third sieving, the two levels of particle size are approximately 200 and 500 microns, respectively.

7. The process according to claim 2 , wherein the particle size of the fourth sieving (T 4 ) and the fifth sieving (T 5 ) is approximately 160 microns.

8. The process according to claim 2 , wherein the feed rates to the first crushing (B 1 ) and the second crushing (B 2 ) are between 3 g/s and 8 g/s, and the feed rates to the third crushing, the fourth crushing, and the fifth crushing are between 1 g/s and 4 g/s.

9. The process according to claim 1 ,

wherein the first and second crushings (B 1 , B 2 ) are each performed using two grooved rollers, and

wherein the third and fourth crushings are each performed using two smooth rollers.

10. The process according to claim 9 ,

wherein fast rollers of the first and second crushings operate at approximately 500 and 1000 RPM, respectively, and

wherein fast rollers of the third and fourth crushings operate at approximately 600 RPM.

11. The process according to claim 9 ,

wherein a differential coefficient between speeds of the fast rollers of the first crushing and slow rollers of the first crushing is approximately 2.5,

wherein a differential coefficient between speeds of the fast rollers of the second crushing and slow rollers of the second crushing is approximately 3.5, and

wherein a differential coefficient between speeds of the fast rollers and slow rollers of the third crushing and the fourth crushing is 1.5.

12. The process according to claim 9 ,

wherein roller gaps for the first crushing and the second crushing are approximately 0.70 mm and 0.10 mm, respectively, and

wherein a roller gap for the third crushing and the fourth crushing is 0.03 mm.

13. A device for grinding wheat, comprising:

four successive crushers, each of said crushers in communication with a sieving system,

wherein first and second crushers (B 1 , B 2 ) produce only three levels of particle size, a third crusher (Cl) following the second crusher (B 2 ) produces only two levels of particle size, and a fourth crusher following the third crusher (Cl) produces a single level of particle size, and

wherein the device is configured to operate such that

the first crusher performs a first crushing (B 1 ) of a wheat sample into a crushed product,

the sieving system performs a first sieving (T 1 ) of the crushed product into three distinct levels of particle size to produce four first products: oversize particles (Re), first-crushing coarse semolina, first-crushing fine semolina, and first-crushing flour (FB 1 ),

the second crusher performs a second crushing (B 2 ) of the oversize particles (Re) to produce crushed oversize particles,

the sieving system performs a second sieving (T 2 ) of the crushed oversize particles into three distinct levels of particle size to produce four sorted second products: coarse bran (GS), second-crushing coarse semolina (Gs), second-crushing fine semolina and second-crushing flour (FB 2 ),

the third crusher performs a third crushing (Cl) of a mixture of the first-crushing coarse semolina and the second-crushing coarse semolina to produce a crushed mixture of coarse semolina,

the sieving system performs a third sieving (T 3 ) of the crushed mixture of coarse semolina into two distinct levels of particle size to produce three sorted third products: fine bran (FS), third-crushing fine semolina and third-crushing flour (FCl),

a fourth crusher performs a fourth crushing (C 1 ) of a mixture of the first-crushing fine semolina, the second-crushing fine semolina, and the third-crushing fine semolina to produce a crushed mixture of fine semolina, and

the sieving system performs a fourth sieving (T 4 ) of the mixture of fine semolina (Fs) into a single level of particle size to produce two sorted fourth products: sharps (Rem) and fourth-crushing flour (FC 1 ),

a mixture of the first-crushing flour (FB 1 ), the second-crushing flour (FB 2 ), the third-crushing flour (FB 3 ), and the fourth-crushing flour (FB 4 ) producing a final milling product (M).

14. The device according to claim 13 , wherein a portion of the sieving system operates with both the first crusher (B 1 ) and the second crusher (B 2 ).

15. The device according to claim 13 , comprising:

only the first, second, third, and fourth crushers, each in communication with the sieving system,

wherein the fourth crusher (C 1 ) is configured to perform, after the fourth crushing, a subsequent fifth crushing of the sharps (Rem) produced by the fourth crushing to produce crushed sharps, and the sieving system is arranged to perform a fifth sieving (T 5 ) of the crushed sharps into a single level of particle size to produce two sorted products: sharps bis (Rem′) and fifth-crushing flour (FC 2 ), and

wherein the final milling product (M) includes the fifth-crushing flour (FC 2 ).

16. The device according to claim 13 ,

wherein the first, second, third, and fourth crushers are each provided with two rollers,

rollers of the first and second crushers (B 1 , B 2 ) being grooved and, and rollers of the third and fourth crushers (Cl, C 1 , C 2 ) being smooth.

17. The process according to claim 2 , wherein the second sieving (T 2 ) and the first sieving (T 1 ) are both performed using a same sieving system.

18. The process according to claim 3 , wherein the fifth crushing (C 2 ) and the fifth sieving (T 5 ) are obtained by a repetition the fourth crushing (C 1 ) and of the fourth sieving (T 4 ) respectively, the fifth-crushing flour (FC 2 ) being added to the fourth-crushing (C 1 ) flour (FC 1 ).

19. The process according to claim 10 ,

wherein differential coefficients between speeds of the fast rollers and slow rollers for the first crushing and the second crushing are approximately 2.5 and 3.5, respectively, and

wherein a differential coefficient between speeds of the fast rollers and slow rollers of the third crushing and the fourth crushing is 1.5.

20. The device according to claim 14 , comprising:

only the first, second, third, and fourth crushers, each in communication with the sieving system,

wherein the fourth crusher (C 1 ) is configured to perform, after the fourth crushing, a subsequent fifth crushing of the sharps (Rem) produced by the fourth crushing to produce crushed sharps, and the sieving system is arranged to perform a fifth sieving (T 5 ) of the crushed sharps into a single level of particle size to produce two sorted products: sharps bis (Rem′) and fifth-crushing flour (FC 2 ), and

wherein the final milling product (M) includes the fifth-crushing flour (FC 2 ).