The invention relates to a mould comprising at least one row of moulding cavities arranged in a base plate (5), each row of cavities including various injection cavities (1) and various blow cavities(2) which are alternately arranged and mutually aligned, with blow cavities (2) on opposite ends of the row. The injection cavities (1) are formed individually in respective injection blocks (3) and the blow cavities (2) are formed individually in respective blow blocks (4). The injection blocks (3) and the blow blocks (4) are separate from each other and project from the base plate (5). The injection blocks (3) are heated by heating means outside the base plate (5), and the blow blocks (4) are cooled by a cooling fluid circulating via cooling conduits (7a) arranged inside the blow blocks (4).