A twin-screw extruder comprises: a barrel having a space formed therein; a left screw and a right screw received in the space; and a drive mechanism for rotating the left screw and right screw, wherein the left screw comprises a left fiberization screw, the right screw comprises a right fiberization screw, wherein a compression space is formed between the left fiberization screw and the right fiberization screw in which the powder is compressed, wherein each of the left fiberization screw and the right fiberization screw includes: a hollow portion connected to a shaft; and a screw portion formed on an outer circumference of the hollow portion, and wherein the screw portion has a flight groove recessed therein through which the powder passes axially.

An apparatus is especially suitable for high volume manufacture of a non-dairy frozen dessert. Pre-frozen blocks of ingredient mixture are masticated in a first stage of the apparatus and aerated in a second stage of the apparatus. Compressed air is injected into a masticated slurry produced by the first stage and mixed into the slurry in the second stage. A continuous process transforms the pre-frozen blocks into a masticated, aerated slurry suitable for immediate consumption, storage for later consumption, or processing into bars or other forms. This apparatus and process is suitable for some ingredient mixtures for which a scrape surface heat exchanger apparatus and process are not suitable.

An apparatus is especially suitable for high volume manufacture of a non-dairy frozen dessert. Pre-frozen blocks of ingredient mixture are masticated in a first stage of the apparatus and aerated in a second stage of the apparatus. Compressed air is injected into a masticated slurry produced by the first stage and mixed into the slurry in the second stage. A continuous process transforms the pre-frozen blocks into a masticated, aerated slurry suitable for immediate consumption, storage for later consumption, or processing into bars or other forms. This apparatus and process is suitable for some ingredient mixtures for which a scrape surface heat exchanger apparatus and process are not suitable.