Foundry core, use of a foundry core, and method for producing a foundry core

A method for producing a foundry core, which is intended for forming a cooling channel in an engine block for an internal combustion engine, the foundry core comprising a supporting section, two neck sections, which protrude from a lateral surface of the supporting section and are arranged at a distance from one another, and at least one bridge section which is held by the neck sections at a distance from the supporting section, the at least one bridge section comprising two lateral surfaces and having a minimum thickness, measured as the distance between the lateral surfaces and lying between the neck sections, that is 3 mm or less,

• wherein the foundry core consists of a moulding material, which comprises a moulding sand and a binder,
• wherein the moulding material is shot into a mould cavity of a core mould by a core shooting machine and subsequently the binder is hardened, in order to provide the foundry core with the required shape stability, and
• wherein at least the moulding material used for forming the bridge area of the foundry core is not a mixture of the moulding sand and the binder, and wherein at least the moulding material used for forming the bridge area of the foundry core comprises moulding sand wherein the grains of the moulding sand are each enveloped by the binder to form coated moulding sand and grains of the coated moulding sand have a mean diameter of 0.35 mm or less and are spherical in shape prior to being shot into the mould cavity of the core mould.