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1. What is Single Screw Extruder

The single screw extruder is a machine in which an Archimedean screw continuously melts, compresses, extrudes, and forms a solid forming material in a heated barrel.

Due to the simple structure, easy manufacture, high processing efficiency, and low price, the single screw extruder is widely used in food processing, plastic processing, film blowing, pipe extrusion, pressing plate, and ribbon drawing.

It is the most mature technology and the most used extrusion Machine type.

The single screw extruder has developed from the initial basic spiral structure, such as damping screw block, exhaust screw, slotted screw barrel, pin barrel, building block structure, and other different structural types.

At the same time, because the single-screw extruder occupies a small space, it has become the main equipment used in the field of compound processing and plastic blown film.

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single screw extruder machine (2)

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2. Single Screw Extruder Working Principle

How does a single screw extruder work?

Food extrusion is a process in which food materials are placed under high temperature and high pressure in an extruder, and then suddenly released to normal temperature and pressure, so that the internal structure and properties of the materials change.

These materials are usually made of grain raw materials such as rice, glutinous rice, wheat, beans, corn, sorghum, etc., and mixed with ingredients such as water, fat, protein, and trace elements.

The extrusion processing method is to uses the driving force of the extruder screw to squeeze the material forward.

The material is subjected to mixing, stirring, friction and high shear force to disintegrate the starch granules, and at the same time the temperature and pressure in the machine cavity increase (can Reach 150-200°C, pressure can reach above 1MPa).

Then it is extruded from a certain shape of the die hole instantly, and the high temperature and high pressure suddenly drop to normal temperature and normal pressure.

The free water vaporizes rapidly under this pressure difference, and the volume of the water can expand about 2000 times.

At the moment of puffing, the structure of the grain changes. He converts raw starch into mature starch, and at the same time, it becomes a layered and loose sponge grain.

When the loose food materials enter the barrel from the feeding hopper, as the screw rotates, it is transported forward along the direction of the screw groove, which is called the feeding section.

At the same time, due to the resistance of the machine head, the solid material is gradually compacted, and the temperature rises due to the external heating of the material from the barrel and the strong stirring, mixing, and shearing of the material between the screw and barrel. , Start to melt, until all melted, called the compression melting section.

As the screw groove gradually becomes shallower, the temperature and pressure continue to increase, the food materials are cooked, a series of complex biochemical reactions such as starch gelatinization, fat and protein denaturation, etc.

The tissue is further homogenized, and finally the die of the machine head is quantitatively and pressure-constrained.

Uniform extrusion is called the metering and homogenization section. The above is the three-stage process of food extrusion processing.

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4. Operation Manual

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3. Single Screw Extruder Applications

Due to its simple structure and low cost, single-screw extruders are widely used in food, plastics, feed and other fields.

In the plastics processing industry, extrusion molding, as an important technology in the polymer processing industry, promotes each other in terms of polymer resin application engineering technology and extrusion production equipment development technology.

Extruders with various structures and functions, such as mixing screw extruders, vented extruders, twin-screw, multi-screw extruders, reactive extruders, combined extruders, suitable for polymer materials.

The molding device built with physical and chemical characteristics has the specialized functions required by various products.

It is an auxiliary machine for the extrusion line that can implement the molding step. It is continuously improved in the pursuit of simple operation, precise control, energy saving and high efficiency, and clean production. Emerging equipment.

In the food processing industry, it is not only used for grain food processing, but also increasingly used for the processing of confectionery products and even spices and other products, involving main meals, breakfast, children’s nutritional food, middle-aged and elderly food, and health and functionality. And snack foods.

It is gradually applied in aquatic products, bionic products, condiments, instant noodles, instant beverages, modified starches and humidified pet food.

The food produced by extrusion technology has the characteristics of being crunchy and delicious, which is helpful for digestion.

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4. Single Screw Extruder Specification

parameters_of_single_screw_extruder

5. Single Screw Extruder Diagram

single screw extruder diagram

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6. Advantages of Single Screw Extruder

Advantages of single screw extruder: single screw extruder has advanced design, high quality, good plasticization, low energy consumption, low noise, stable operation, large bearing capacity and long life.

The single-screw extruder adopts a two-stage overall design to strengthen the plasticization function to ensure high-speed, high-performance and stable extrusion.

The special barrier comprehensive mixing design ensures the mixing effect of the material, and the high shear and low melting temperature are guaranteed.

High-performance low-temperature low-pressure metering extrusion of materials. In addition, the single-screw extruder is cheap in design, so the single-screw extruder is widely used.

7. Single Screw Extruder Manufacturer

Anyang Ainuok Machinery Equipment Co., Ltd is specialized in the research, development, production, and sales of Single Screw Extruder Machine for more than 10 years.

Single Screw Extruder Machine has been exported to England, Russia, Sweden, Poland, Romania, Malaysia, Indonesia, Vietnam, etc 120 countries and districts.

Warmly welcome clients at home and abroad to visit the Ainuok company.

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Blog: Single Screw Extruder: The Complete Guide