Mixer/vacuum coater

A mixer unit comprising:

• a mixing chamber comprising:
• a de-agglomerator with a de-agglomeration shaft with de-agglomeration means;
• a mixer with a mixer shaft with two or more mixing paddles, arranged for mixing and impelling particles and powders in an upstream direction (u) towards the de-agglomerator, wherein the de-agglomeration shaft is arranged above, and in parallel with the mixer shaft,
• the mixing chamber further comprising:
• a first portion of the mixing chamber having an inner profile adjacent and curved about an upper part of the de-agglomerator and arranged to guide the particles and powders impelled by the two or more mixing paddles over the de-agglomeration shaft, and further one or more spray means that are arranged adjacent, above, and at a downstream particle flow side of the de-agglomerator, for providing a liquid spray into the downstream particle flow in the mixing chamber;
• a second portion of the mixing chamber having an inner profile curved upwards and adjacent about a lower part of the mixing chamber;
• and
• a third portion of the mixing chamber having a planar profile that extends substantially vertically between the first portion and the second portion to guide the particles and powders in the upstream direction (u).