Multi-layer tablet with recess, device and method for compacting such a tablet

A compacted multilayer tablet, wherein each layer is formed from powder mixtures for detergent or disinfectant action, comprising:

• a first layer with a through cavity along a longitudinal axis orthogonal to the first layer so as to form a pierced layer;
• a second layer directly formed on the first layer;
• and
• a third layer directly formed on the second layer;
• wherein the first layer is the only pierced layer of the tablet and the second layer fills 5% to less than 70% of the volume of the cavity of the first layer.

A compacted multilayer tablet, wherein each layer is formed from a mixture in powder form, comprising:

• a first layer with a through cavity along a longitudinal axis orthogonal to the first layer so as to form a pierced layer;
• and
• a second layer directly formed on the first layer;
• wherein the cavity of the first layer is uniformly filled with the mixture forming the second layer starting from the contact surface between the first layer and the second layer, the second layer filling 5% to less than 70% of the volume of the cavity of the first layer.