2 Things to Consider Before Selecting a Food Extrusion ...

The food industry has seen massive growth over the years. The total revenue in the snacks industry is at a whopping US$449,000 in globally. Whether that&#;s down to a growing population or changes in eating habits and preferences, there&#;s no doubt that snack items are in huge demand everywhere.

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This makes it a tremendous opportunity for businesses in the food industry to capitalize on. Identifying what the consumers want and providing them just that is the simplest way for a business to succeed.

Some businesses tend to go the extra mile and try to be creative regarding their food items. One way of doing that is by partnering with a food extrusion technology company. They are experts at processing raw food materials into finely shaped final products, which can help a business gain a competitive advantage.

Here are the things a business needs to consider before selecting a food extrusion company.

Capability to Handle Different Food Products

Since there are different kinds of extruders, you must ensure the extrusion company provides the right equipment to handle the needs of the food item you have.

Single-screw extruders are more suited to be animal feed extrusion machines. They have a lower capacity, which can help the business lower their costs by only choosing as per their requirements.

On the other hand, twin-screw extruders are better for a wider range of food items, including human food, aqua feeds, and pet food.

Process Efficiency & Focus on Food Nutrition

For food products cooked at high temperatures, food extrusion does wonders with its short cooking time. The following are the benefits of its high-temperature short time (HTST) process:

• Harmful organisms are eliminated
• Digestibility improves
• Anti-nutrients eliminated

Wrapping it all up, the basic things you should look for in a food extrusion company is how well their machines are equipped to handle different food products and how streamlined their process is.

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Extrusion is a well-established process in the snack industry. It has been used for many years to make standard products such as corn curls, onion rings and chipsticks and twin-screw extrusion is increasingly being used for more sophisticated snacks with interesting textures or centre fillings.

 

 

Simple expanded products

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Selecting the right extrusion method is trickier: single screw extruders offer simplicity and lower capital cost, but twin-screw extruders provide versatility and higher quality products. This is a fundamental decision with long-term implications, and needs careful consideration.

For companies who foresee a continuing need for relatively small outputs of simple products a single-screw extruder is adequate. But businesses are rarely static, and many single-screw operators are faced with a dilemma when throughput, variety, quality and flexibility need to be increased. Do they add more single-screw machines &#; adding volume but not value &#; or switch to twin-screw?

At this point, I know that many do make the switch to twin-screw processing. Potential benefits include the choice of a wider range of ingredients, greater throughput, improved quality, added flexibility, superior process control and lower running costs At this point, I would guess that many are asking themselves why they chose single screw in the first place.

 

Twin-screw extrusion can be used for innovative products, such as sheeted snacks

Both single- and twin-screw extruders generate temperature from mechanical energy, act as a pressurised cook chamber, and define the shape and texture of the product. The contrast between the two extrusion techniques is, however, significant.

With a short barrel and low retention time, single-screw machines offer comparatively poor quality of mixing and heat transfer. Twin-screw extruders &#; with their intermeshing screw design &#; create more shear to ensure the ingredients are thoroughly mixed. They also create more pressure, giving a denser and more controllable product at the die. The result is a higher quality snack.

Single-screw extruders are simple to maintain and operate, but can be used to produce only uncomplicated direct expanded snacks using basic formulations, mainly with granular free-flowing materials such as maize grits. Twin-screw extruders process a much wider and more complex range of ingredients including oat flour, starches and fine particle size materials.

I would contend that successful companies must aim to meet a clear demand for attractive, sophisticated products that provide differentiation in a crowded market. Twin-screw extruders, plus a range of post-extrusion forming and cutting technologies, including co-extrusion, can create high-value snacks with an interesting and diverse range of shapes, textures and surface finishes. This is simply not possible with a single-screw machine.

 

Value-added co-extruded products are only possible via twin-screw extrusion

Twin-screw machines provide higher potential throughput, and savings in start and stop procedure, cleaning, and wear. A twin-screw extruder does everything a single-screw can do &#; and much more. Ambitious, growing companies are choosing twin-screw extrusion as a technology they can rely on as their business develops.

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Single ScrewTwin ScrewRelative Cost per Capacity1.01.5 &#; 2.5Max Output100-500 kg/hr100 &#; 1,500 kg/hrSelf-CleaningNoYes &#; self wiping screwsMixingPoorGoodHeat TransferPoorGoodProduct Moisture Range %12 &#; 356 &#; 50Raw MaterialsGranular free flowingWide rangeWearHighLow