COFFEE PAD FOR USE IN A COFFEE MACHINE

Pad (1) for use in a coffee machine for preparing a beverage for obtaining at least one part of a single beverage serving which pad, for use in the coffee machine is adapted to receive an aqueous fluid that is supplied under pressure to the pad so that the fluid is forced through the pad for obtaining the at least one part of the beverage serving that then exits the pad, wherein the pad includes a covering defining an interior space that is filled with a beverage preparation product for preparing the beverage, wherein the covering comprises a flexible first sheet (8) and a rigid shell (10), wherein the shell at its outer face is equipped with at least one substantially circular rib (40) closed in itself, wherein the first sheet and the shell are connected to each other around their perimeter edges, wherein the shell is equipped with at least one outlet opening (12), wherein the pad is further equipped with a second sheet (22) that is positioned on a bottom of the shell, wherein the second sheet is located between the beverage preparation product and the shell and wherein the first sheet and the second sheet each form a filter that allows an aqueous fluid, including water, and the beverage to pass and that forms a barrier for the beverage preparation product so that, when in use an aqueous fluid under pressure is supplied to the first sheet of the pad the fluid flows through the first sheet to the beverage preparation product so that the beverage is formed which beverage then flows through the second sheet and via the at least one outlet opening leaves the pad, a combination of a primary and a secondary pad and a system comprising a coffee machine and a primary pad.