The twin-screw extruder is powerful and has a wide range of applications, so there are a wide variety of products that can be made. For the characteristics and product requirements of various materials, we must choose different auxiliary machines to adapt or improve the material characteristics to make the perfect product.

The products that can be made are roughly classified into plastic materials such as plastic raw materials, sheet materials, pipes, cast films, and the like. Today, we will use granulation as an example to briefly introduce the auxiliary machines needed to granulate with a twin-screw extruder!

1. Water-cooled strip granulation

The appearance of pelletizing : the pellets are cylindrical, the end faces are neat, the particle size is produced, and the length is adjustable.

Scope of application : It is suitable for most plastic granulation. It is mainly used in plastic filling and granulation process such as plastic filling modification, reinforced plastic, color masterbatch, engineering plastic alloy and special masterbatch. It is one of the most widely used processes. Easy to operate, easy to maintain, etc., is also the most economical choice.

Auxiliary machines mainly include : stainless steel sinks, air knives (for drying), pelletizers, vibrating screens, silos, dryers, etc.

2, air-cooled conveyor belt granulation

The appearance of pelletizing : the pellets are cylindrical, the end faces are neat, the particle size in production, and the length are adjustable.

Scope of application : For materials with high filling capacity and difficult to dry after immersion in water, air-cooled conveyor belt can be selected to cut pellets to ensure material quality.

Auxiliary machines mainly include : air-cooled draw heads, air-cooled conveyor belts, pelletizers, vibrating screens, finished silos, etc.

3, water ring die face hot cutting granulation auxiliary machine

Pellet appearance : The particles are round flakes, and the particle diameter and thickness can be adjusted according to customer requirements.

Scope of application : For materials that are not easy to be drawn and easy to dry, you can choose the water ring die face hot cutting granulation auxiliary machine, compared with the previous two granulation methods, because it can be directly granulated on the die face, eliminating the need for sinking and conveying. With the cooling time, this set of granulation yields a higher yield.

Auxiliary machines mainly include : water ring hot cutting head, water ring cover, pelletizer, centrifugal dewatering machine, centrifugal water pump, vibrating screen, finished silo, etc.

4, air-cooled die face hot cutting granulation auxiliary machine

The appearance of pelletizing : the pellets are round flakes when they are cut. Due to the centrifugal force of the cyclone separator, the pellets are mostly in the shape of cashew nuts. The diameter and thickness of the pellets can be adjusted according to customer requirements.

Scope of application : For materials that are not easy to draw and not easy to dry, air-cooled die face hot-cutting granulation auxiliary machine can be selected. Compared with the first two granulation methods, the granulation method has a higher yield because it can be directly granulated on the die surface, eliminating the need for cooling on the water tank or the conveyor belt.

Auxiliary machines mainly include : air-cooled hot-cutting machine head, wind ring cover, pelletizing car, high-pressure fan, three-stage cyclone, air supply pipe, vibrating screen, finished silo, etc.

5, underwater pelletizing auxiliary machine

Pellet appearance : The particles are round, uniform and beautiful, and the particle size can be adjusted during production.

Applications : Underwater pellets are suitable for almost all plastics. Because of its high cost, it is generally used for high-quality, low-hardness materials, such as elastomer series, especially for high-yield pp granulation, elastomers, etc.

Auxiliary machines mainly include : underwater cutting head, underwater pelletizing machine, conveying water pipeline, bulk material separation device, centrifugal dewatering machine, vibrating screen, finished silo, etc.

6, other optional auxiliary equipment

Premixing stage

The main thing that must be done before feeding the material into the twin-screw extruder is the premixing of the material. The uniformity of this mixing also determines the quality of the material. The premixed equipment includes high-mixing machine, high-low mixing unit, color mixing machine, and negative pressure dust-free premixing feeding unit, which solves the defects of large dust in the workshop, high pollution and failure to meet environmental standards. .

2. Feeding stage

After the materials are mixed, the vacuum feeder can be selected, and the screw feeder feeds the material into the twin-screw extruder feeding hopper, eliminating the labor and high-intensity labor.

3. Side feeder

For some materials, such as short glass, additives, etc., you can choose a side feeder.

4. Drying stage

For materials with high drying requirements, you can choose auxiliary machines such as dryers and boiling beds.

5. Packaging stage

Automatic, semi-automatic weighing and packaging system, available in a variety of sizes, 25kg / bag, 50kg / bag or other specifications can be set.

6. Palletizing system

Finished bag delivery, finishing, robotic palletizing.

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