Patent ID: 7770627

Claim:
A vent assembly for an apparatus for forming a solid product from a molten material, the vent assembly comprising a vent chamber comprising a plurality of vent sections, an inlet for the vent chamber comprising a distribution rail, connecting to the base of each vent section and a pair of chill blocks having corresponding chill surfaces and being arranged in opposition to define the vent chamber therebetween, each of the chill surfaces comprising a plurality of longitudinally adjoining chill faces, each chill face extending the length of the vent chamber, each chill face having a corresponding chill face on the paired chill block defining one of the plurality of vent sections therebetween, the plane of each chill face being oriented at an angle to an adjoining chill face across the width of the respective chill block to define at least one protruding wedge received in a corresponding shaped recess of the paired chill block, the adjoining chill faces forming at least one wedge and recess being joined across the width of the vent chamber.