Twin-screw granulator single-screw granulator Jiangsu twin-screw granulator manufacturer direct supply

Twin-screw granulator
Jiangsu twin-screw granulator
Basic principles of screw element arrangement:
The speed of the screw rods at the meshing point is opposite. One screw will pull the material into the meshing gap, while The other screw pushes the material out of the gap, causing the material to move from one screw to the other and advance in a shape. 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 high shearing speed and has a good self-cleaning effect, that is, it can scrape off any accumulation of material adhered to the screw, thereby The residence time of the material is very short, so the engineering plastic granulator is mainly used for mixing and granulation.
Melting section: Toothed discs and kneading discs 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 mixing: use narrow blades with smaller staggered angle elements. Dispersion mixing: use wide blades with larger staggered angle elements. Left-hand conveying kneading disks or multiple Teethed toothed disc
Exhaust section: In front of the exhaust port, a counter-threaded element is usually installed 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 the method of using reverse kneading discs and reverse threaded elements alternately can be used. A large-pitch conveying element with a deep groove is usually installed in the middle of the exhaust section< br/> Melt conveying section: Toothed disc components can be used to improve the homogenization quality of the melt, and small pitch threaded components can be used 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, and the requirements for reinforced and filled types are completely different. Even for the same type of processing, such as engineering plastic alloy:, the requirements for /alloy are different from the requirements for /B.
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The corresponding screw combinations of several different materials are listed below: (Only the meshing block combinations of the melting and homogenizing section are listed)
Flame retardant B or/< br/> / /
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Nylon reinforced or enhanced flame retardant:
/ /
/
Filled reinforced or filled flame retardant enhanced:
/ /
Due to the freely combinable characteristics of screw combinations in the blending processing of engineering plastics, although it provides a great degree of freedom in changing combinations, 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.
Scope of use Polycarbonate) Polyamide (Nylon, , ) Polyacetal, ) Modified polyphenylene ether ( , Modified) Polyester (, B) Polyphenylene sulfide ( , ) Polyaryl ester, phenol plastic Epoxy plastic, etc. Polyamide imine, polyamide imine b, acrylic plastic and other engineering plastics processing and granulation

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