Patent ID: 8454487

Claim:
A separation disc adapted to being fitted in a milk separator comprising a rotor, to being rotatable together with the rotor about an axis of rotation and to forming together with other separation discs which are fitted in the rotor substantially coaxially with the axis of rotation, wherein spacing members are arranged to keep adjacent separation discs in the stack at mutual axial spacing such that the separation discs form between them narrow flow gaps for milk which is to be separated during operation of the milk separator by means of centrifugal force, the separation disc comprising; a truncated substantially conical portion and an annular flange element which is connected to the conical portion at a smallest radius defined thereby, the annular flange element extends therefrom radially inwards substantially perpendicular to the axis of rotation; the separation disc defines a hole which surrounds the axis of rotation and which forms in the stack of separation discs a flow passage which extends axially through the stack of separation discs to lead away cream separated from the milk; the flange element delimits an axial throughflow cross-section for the flow passage for the cream; the flange element has a radial extent corresponding to at least 10% of the radial extent of the substantially conical portion, and the inner radial edge of the flange element is provided with a number of recesses distributed along the circumference of the edge and adapted to protrusions on a column which is connected to the rotor and which extends coaxially through the stack of separation discs, so that the recesses and the protrusions provide polar guidance and centering for the separation discs relative to the column and the rotor; the recesses are formed so that the protrusions fill substantially the whole of the recesses and that the radial extent of the recesses corresponds to at least 20% of the radial extent of the flange element, the column protrusions being adapted to entraining the cream during operation of the milk separator.