Three-screw extruder

Abstract

The invention provides a three-screw extruder which has a simple structure, has more shearing zones for shearing, mixing, compounding, exhausting, reacting and self-cleaning compared with a single screw extruder and the double-screw extruder, and is particularly suitable for uniformly dispersing and compounding high-sensitivity and high-viscosity materials and materials which contain moisture and volatile components and are required to be degassed. The three-screw extruder comprises an outer barrel and is characterized in that the outer barrel is a semi-elliptical, a feeding hole is formed in the upper end of the front side of the outer barrel, a discharge hole is formed in the lower end of the rear side of the outer barrel, a driving end is connected at one end, which is provided with the feeding hole, of the outer barrel, an output end is connected at one end, provided with the discharge hole, of the outer barrel, three screws which rotate in the same direction and are distributed in an equilateral triangle manner are arranged in the outer barrel, and a first mixing zone, a second mixing zone and a third mixing zone are sequentially arranged on the screw rod in an axial direction of the screw rod respectively.

Description

Technical field [0001] The invention relates to the technical field of extruder equipment, in particular to a three-screw extruder. Background technique [0002] In recent years, with the development of engineering plastics in the direction of high quality, high performance, and low cost, there has been a diversification and composite of plastic products worldwide. Correspondingly, it is necessary to develop high-performance screw extruders with suitable residence time and high shear force. For general material extrusion processing, the single-screw extruder is the most widely used. However, due to the single-screw extruder for glass fiber reinforcement, fuel-resistant granulation, thermosetting plastic mixing and extrusion and other powder processing, it is affected by the forward movement of materials. Dynamic action, the material will hug the screw and rotate together, so that the screw can not play its role of advancing, the mixing effect is not good, the original single-scr...

AI Technical Summary

Problems solved by technology

The single-screw extruder is the most widely used in the extrusion processing of general materials, but because the single-screw extruder performs powder processing such as glass fiber reinforcement, fuel-resistant granulation, and thermosetting plastic mixing and extrusion, it is subject to the limitation of material forward movement. Under the action of power, the material will hug the screw and rotate together, so that the thread cannot play its role of propulsion, and the mixing effect is not good. The heat generated by the friction of the original single-screw extruder is more, the shearing of the material is uneven, and the screw The conveying capacity is average, the extrusion volume is unstable, and the material stays in the outer cylinder for a short time, etc.

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