초록 ▼

A dry raw cereal material having a starch fraction is fed into the inlet (38) of a twin screw preconditioning unit (10). The dry material is rapidly advanced and mixed in the first two zones (31, 32) and conveyed into a third zone (33). Water is introduced by ducts (42) and is admixed with the dry m

A dry raw cereal material having a starch fraction is fed into the inlet (38) of a twin screw preconditioning unit (10). The dry material is rapidly advanced and mixed in the first two zones (31, 32) and conveyed into a third zone (33). Water is introduced by ducts (42) and is admixed with the dry material to form a well mixed wetted cereal material. The screws (14, 16) include blank segments (14c, 16c) having radially extending pins (40) to create a material plug in the barrel (30) of the preconditioning unit (10). Steam is added to the wetted material in the next zone (34) to form a heated wetted cereal material which is worked in the fourth zone (34) to form a heated precooked non-continuous cereal compacted dough material which is generally maintained below its gelatinization point. The dough material exits the outlet (41) of the preconditioning unit (10) and enters a low shear extended time cereal cooker (46) which finish cooks the dough material to a fully cooked cereal dough which is formed into desirably shaped and sized pellets.

대표청구항 ▼

[ What is claimed is:] [1.] Twin screw extruder comprising, in combination: a housing assembly including a channel adapted to receive intermeshing screws; first and second intermeshing screws located in the channel and rotatably mounted in the housing assembly; an inlet formed in the housing assembl

[ What is claimed is:] [1.] Twin screw extruder comprising, in combination: a housing assembly including a channel adapted to receive intermeshing screws; first and second intermeshing screws located in the channel and rotatably mounted in the housing assembly; an inlet formed in the housing assembly for the introduction of material into the channel; an outlet formed in the housing assembly for exiting of conditioned material from the channel, with the first and second screws including an inlet zone for conveying material from the inlet towards the outlet, an operative zone for conditioning the material moving between the inlet and the outlet, and an outlet zone moving the conditioned material through the outlet; a first duct for introducing steam into the channel in the operative zone of the screws; and means in the channel upstream of the first duct for creating a material plug in the channel for generally preventing steam introduced through the first duct from passing upstream therebeyond.