Twin Screw Extrusion Processing versus Conventional Food Processing
Twin Screw Extrusion - The cheapest, most efficient and most compact method of making high-quality structured products. It’s no surprise, why the scope of twin-screw extrusion in the food industry is continually expanding.
Twin screw extrusion technology was first used in 1956, and since then, it has evolved and today, the twin screw extruder is well-recognized for Food & Feed processing. Screw extrusion is predominant in food applications. The process of screw extrusion is used to make a variety of products and combines many operations as one.
Co-Rotating Twin Screw Extruders |
How Does A Twin Screw Extruder Work?
Twin screw extruders consist of two co-rotating, intermeshing screws mounted on splined shafts in a closed barrel. Due to a wide range of barrel and screw designs, manufacturers can set up various screw profiles and process functions as per the process requirements. Hence, a twin screw extruder is capable of:
• Compressing,
• Mixing,
• Cooking,
• Shearing,
• Heating,
• Cooling,
• Pumping,
• Shaping, etc., with a high level of flexibility.
Laboratory-Scale Twin-Screw Extruder |
The major advantage of an intermeshing, co-rotating twin screw extruder is their outstanding mixing capability which adds significant value to processing units. In twin screw extrusion processing, the raw materials may be solids, liquids, slurries, and possibly gases. Extruded products are chemically modified polymers, cellulose pulps, plastic compounds, textured food and feed products, etc.
There are numerous advantages of extrusion processing over conventional cooking processes. Extrusion is a continuous, High-Temperature-Shirt-Time process. The extrusion process is flexible as on-line process adjustments can be made to achieve desired product characteristics. In addition, the same extruder can also be used to manufacture different types of products. The process is energy-efficient and has no effluents. It can be used to process highly viscous, relatively dry materials as well as wet or moist materials. Recent advances in the development of better process control strategies have made it possible to a great extent, to control the thermo-mechanicals changes during the process of extrusion in order to achieve desired product properties.
Single Screw Extruder |
Highly Flexible: Extrusion processing is able to process various types of mix formulations and raw materials, and to produce a wide range of end products, whereas, the conventional cooking process is often limited to the production of low ranges of end-products with the possibility to change the operating parameters.
Fully Automated: Twin screw extrusion is fully automated with a high level of operating stability, therefore leading to consistent product quality. Conventional processing requires frequent adjustment of process parameters.
Cost-Effective and Economical: Twin screw extruders are extremely cost-effective and economical as they’re characterized by reduced CAPEX and OPEX due to their remarkable process intensifying capability.
Sustainable: Associated processing lines and remarkable process-intensifying capability of twin-screw extrusion technology allows achieving determinant operational advantages, such as energy and water savings, reduced footprint, HTST cooking, and high productivity.
Extrusion Plants
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CFAM Technologies has developed its own unique range of world-class twin screw extruders. The extruders are being used to produce ready-to-eat or pre-cooked products for pet foods, human foods, aqua feeds as well as other specialized applications including engineering plastics, waste processing, powder coating paints, and the extrusion of polymers.
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