Apparatus and method for manufacturing products

A method of manufacturing confectionery products, each product comprising an outer casing of a first confectionery material and containing at least one chamber filled with a second confectionery material, the method being carried out using apparatus comprising an extrusion die defining an extrusion aperture and at least one fluid outlet within the die, the apparatus defining a first material supply path along which the first material flows to the die and a second material supply path along which the second material flows to the at least one fluid outlet, the method comprising extruding the first material through the die to form an extrudate body and delivering the second material through the at least one fluid outlet in the die to form at least one chamber filled with the second material within the extrudate body, wherein the method comprises periodically and momentarily varying the extrusion process to produce a section of extrudate body having no chamber filled with the second material, in which periodically and momentarily varying the extrusion process comprises periodically and momentarily increasing the volume of the second material supply path to temporally reduce the flow of the second material into the extrudate body from the at least one fluid outlet, and is performed using at least one flexible element located upstream of the die in each of the first material supply path and the second material supply path, each flexible element comprising a tubular membrane actuated by a fluid actuation system operable to introduce or remove a hydraulic fluid within a fluid chamber to move each flexible element.