We manufacture single screw and twin screw Extruder for processing food cereals. The chief application for these Extruders have been for Pre-Gelatinized Starch and for the preparation of pellets (half products/3G pellets) used for expanded Snack food. The Extruder works using the heat from electric heaters round the barrel and the mechanical work provided by the rotating screw(s) to compact & cook the starch, flour pre-mixed with moisture and ingredients. Essentially, a cooking extruder is provided with specially designed screw(s) with a cooking and forming zone. The cooking zone compacts and cooks the mass to desired degree and the forming zone functions as a cooling zone, to control the viscosity of dough to level required for proper extrusion through the die.

In the process of producing Pre-Gelatinized Starch (PGS), a single screw Extruder or Twin screw Extruder is used to cook the starch, pre-mixed with moisture and other ingredients, if any, to extrude the semi-cooked dough through a suitably shaped die opening. The extruded dough is continuously cut by a die/face cutter and is subsequently pulverized to fine powder for use by other industries.

In production of pellets for Expanded Snack food, the flour (rice, maize, potato, wheat or soya flour) is pre-mixed with moisture, shortening and processing aid, etc. and cooked inside the extruder and extruded out of suitably shaped opening, continuously cut at die face by die/face cutter and dried for safe handling & packing. The pellets are usually heated in oil or hot air, afterwards, for complete expansion and final consumption.

Before feeding the raw-materials into the Extruder, it is desirable to have a pre conditioner chamber which can consist of single or two agitating shafts with steam injection arrangement to ensure that the ingredients are not only pre-heated by steam, but also to ensure complete hydration of raw-material ingredients with water for proper cooking in the Extruder.

High shear cooking extruder (single or twin screw) can be sued for producing direct expanded or 2G snack food. In such machine the product made from food cereal is cooked inside the machine by application of high shear and heat with moisture and product expands immediately as it comes out of die, and cut by suitable cutter at the die, as steam flashes out of product.