Colloid mill

1 . A colloid mill for reducing a particle size of particles suspended in a first liquid, or a droplet size of a second liquid emued in a first liquid,

having at least one rotor and at least one stator, which are arranged coaxially one inside the other,

wherein the colloid mill has at least one material inlet for introducing particles, a liquid, a suspension or emulsion on a first axial side and at least one product outlet for conducting away the suspension or emulsion on a second axial side,

wherein the at least one rotor has a rotor grinding surface facing toward the stator, and the at least one stator has a stator grinding surface facing toward the rotor,

wherein at least one or more of:

the rotor grinding surface has at least one grinding tooth with at least one or more of a shearing surface and shearing edge, wherein the cross-sectional surface of the grinding tooth of the rotor grinding surface tapers, in a plane perpendicular to the axis of rotation, in the radial direction toward the opposite stator grinding surface, wherein the cross-sectional surface has a first leg, which adjoins a base side, running in the circumferential direction, of the cross-sectional surface, points in the direction of rotation of the rotor, encloses an angle of 80°-100°, with the base side,

and

the stator grinding surface has at least one grinding tooth with at least one or more of a shearing surface or shearing edge, the cross-sectional surface of which grinding tooth tapers, in a plane perpendicular to the axis of rotation, in the radial direction toward the opposite rotor grinding surface, wherein the cross-sectional surface has a second leg which adjoins a base side, running in the circumferential direction, of the cross-sectional surface, wherein the second leg points counter to the direction of rotation of the rotor, and the second leg encloses an angle of 80°-100°, with the base side.

2 . The colloid mill according to claim 1 , wherein the cross-sectional surface of at least one grinding tooth forms a polygon, which has a longer base side, which runs in the circumferential direction, and a shorter base side, which is parallel to the longer base side and located on a shearing surface of the grinding tooth.

3 . The colloid mill according to claim 1 , wherein the cross-sectional surface of at least one grinding tooth forms a polygon, the tip of which points toward the opposite grinding surface or the grinding surface to be arranged opposite thereto and located on a shearing edge of the grinding tooth.

4 . The colloid mill according to claim 1 , wherein the at least one tooth of the rotor grinding surface or the stator grinding surface is formed as a rib with a constantly large cross-sectional surface along its longitudinal extension.

5 . The colloid mill according to claim 1 , wherein the shortest distance between the rotor grinding surface and the stator grinding surface is between 0.05 mm and 1.2 mm.

6 . The colloid mill according to claim 2 , wherein the value of a shearing surface rate is less than 0.07, wherein the value of the shearing surface rate indicates the product of the proportion of the smaller base sides of the cross-sectional surfaces of grinding teeth of the rotor grinding surface in the circumference of a circle formed by a bottom of the rotor grinding surface around the axis of rotation, and the proportion of the smaller base sides of the cross-sectional surfaces of grinding teeth on the stator in the circumference of a circle formed by a bottom line of the stator grinding surface around the axis of rotation.

7 . The colloid mill according to claim 1 , wherein the colloid mill has a housing, and the stator and the housing are not manufactured in one piece so that the stator is exchangeable.

8 . System ( 70 ) for processing food masses, comprising a colloid mill ( 40 ) according to claim 1 , which is arranged upstream of a ball mill ( 50 ) and downstream of a mixer ( 60 ).

9 . Method for reducing a particle size of particles suspended in a first liquid, and a droplet size of a second liquid emulsified in a first liquid, wherein the first liquid is a fat mass, in a colloid mill according to claim 1 ,

wherein, in order to form a suspension or emulsion, material is guided along between the stator grinding surface and the rotor grinding surface, from a first axial end of the colloid mill to the second axial end of the colloid mill,

wherein the temperature of the material increases by less than 40° C. on the path through the colloid mill.

10 . Method according to claim 9 , wherein the area between the cross-sectional surfaces of two circumferentially adjacent grinding teeth ( 5 a , 5 b ) on the stator grinding surface ( 4 ) and the rotor grinding surface ( 3 ), in a plane perpendicular to the axis of rotation, provides space for the cross-sectional surfaces ( 100 ) of 3-10 particles ( 101 ) and droplets.