Twin-screw granulator | Jiangsu twin-screw granulator

> Twin-screw granulator
Jiangsu twin-screw granulator
Basic principles of screw element arrangement
The speed of the rods at the meshing point is opposite. One screw will pull the material into the meshing gap, while the other screw will pull the material into the meshing gap. A screw pushes the material out of the gap, causing the material to move forward in a shape from one screw to another. Since the gap in the meshing area is very small, the speed directions of the thread and the groove at the meshing area are opposite, so it has a very high shearing speed and has a good self-cleaning effect, which can scrape off any accumulation of material adhered to the screw, thereby shortening the residence time of the material. It is very short, so the engineering plastic granulator is mainly used for mixing and granulating.
The toothed disc and kneading disc in the melting section can be used to accelerate the melting and mixing of materials. In practice, forward conveying elements are generally used to separate the mixing elements. In order to avoid a large temperature gradient in the melting zone
Mixing section distribution and mixing use narrow pieces of smaller staggered angle elements for dispersion mixing and use wide pieces of larger staggered angle elements for left-hand conveying kneading disks or multi-toothed toothed disks
The exhaust section is usually equipped with a counter-threaded element in front of the exhaust port to block the melt so that the material can fill the screw channel. For extruders used for devolatilization and drying, multiple exhaust ports must be installed, so a method of alternating reverse kneading disks and reverse threaded elements can be used. A large-pitch conveying element with a deep groove is usually installed in the middle of the exhaust section
The melt conveying section can use toothed disc elements to improve the homogenization quality of the melt and also use small-pitch threaded elements to enhance the forward conveying capability. Screw combination methods of several engineering plastics
Different materials have different requirements for the mixing ability of the screw. The requirements for reinforced and filled types are completely different. Even the same type of processing type such as engineering plastic alloy/alloy requirements are not the same.
The corresponding screw combinations of several different materials are listed below (only the meshing block combination of the melting and homogenizing section is listed)
Flame retardant or /
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Nylon reinforced or reinforced flame retardant
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Filled reinforced or filled flame retardant reinforced
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The blending processing of engineering plastics is due to The screw combination is freely combinable, so although it provides a great degree of freedom in replacing the combination, it also places higher requirements on process control and process designers. Combining different screw combinations according to the mixing requirements of different blending systems has become an important link in the blending operation process of engineering plastic granulators.
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