Abstract: Frozen aerated products having a mean ice crystal diameter of between about 20 and 60 microns and a mean equivalent diameter of about 32 to 36 microns and a homogeneous distribution of fats and proteins. These products are manufactured with a device having two endless screws, identical and parallel, meshing with each other and turning in the same direction, located in a casing fitted at one of its ends with a nozzle and at the other end with an inlet for feeding with composition to be frozen and, in an intermediate area, with an inlet for feeding air. The casing is provided with a jacket in which refrigerating fluids circulate.

Abstract: Composite articles of frozen confectionery are manufactured containing inclusions, by forming extrusions of a central filling surrounded by a sleeve of frozen composition by co-extrusion at a temperature for the frozen composition of less than or equal to about −8° C., and the extrusions are then processed into a mass of frozen composition incorporating the inclusions by coiling up the extrusion or folding it on itself. The filling is injected into the heart of the vein of frozen composition leaving the extruder, by a co-extrusion nozzle which may be moving of static.

Abstract: Frozen aerated compositions are prepared by introducing an unfrozen composition suitable for being frozen for preparing a frozen aerated composition into the barrel of an extrusion apparatus containing a single screw and rotating the screw for transporting the composition through the apparatus to and then through an extrusion exit die and for during transport of the composition through the extrusion apparatus, mixing, shearing and compressing the composition. Additionally during the transport of the composition through the apparatus, the composition is cooled and air is injected into composition to obtain from the die a compressed, aerated, cooled composition which has a temperature of equal to or lower than −8° C.

Abstract: Frozen concentrated milk is prepared by introducing a concentrated milk, such as a concentrated whole or skim milk, into the barrel of an apparatus for extrusion of a product which contains at least one screw which is rotated for transport of the concentrated milk through the apparatus barrel for extrusion of product through an extrusion apparatus product exit die, and during the transport of the concentrated milk through the extrusion apparatus, the concentrated milk is cooled to a temperature of equal to or lower than −8° C. to obtain, from the exit die, frozen concentrated milk.

Abstract: For preparing an extrusion-cooked food product, a food component emulsifier is combined with water to obtain an aqueous dispersion of the emulsifier, and the dispersion is fed into an extruder for being mixed with food components being mixed and heated in the extruder to prepare the extrusion-cooked product.

Abstract: The method for manufacturing frozen aerated products includes the use of a device having two endless screws, identical and parallel, meshing with each other and turning in the same direction, located in a casing fitted at one of its ends with a nozzle and at the other with a device for feeding with composition to be frozen and, in an intermediate area, with a device for feeding with air, the casing being provided with a jacket in which refrigerating fluids circulate.