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Post Requirements
Product information
Polyethylene screw extrusion granulator
Working principle
The production process of the polyethylene screw extrusion granulator: The materials, after being closely mixed, are sent into the double-cone feeder by the automatic elevator. The double-cone forces the materials to be evenly added into the main screw. Under the compression, shearing and external heating of the screw, the materials are mixed and plasticized. The temperature and pressure gradually increase, presenting a viscous flow state, and then pass through the die head under a certain pressure, extruding and pelletizing, and finally obtaining particles of the desired shape.
Product Introduction
(1) Screw:
(2) Barrel: It is a metal cylinder, generally made of alloy steel with high heat resistance, pressure resistance, durability, wear resistance and corrosion resistance, or a composite steel pipe lined with alloy steel. The barrel works in conjunction with the screw to achieve the crushing, softening, melting, plasticizing, venting and compaction of plastics, and continuously and evenly conveys the rubber compound to the molding system. The general length of the barrel is 15 to 30 times its diameter, based on the principle of ensuring that the plastic is fully heated and plasticized.
(3) Hopper: The bottom of the hopper is equipped with a cut-off device to adjust and cut off the material flow. On the side of the hopper, there is a sight hole and a calibration and metering device.
(4) Die head and mold: The die head is composed of an inner alloy steel sleeve and an outer carbon steel sleeve. Inside the die head, there is a forming mold. The function of the die head is to transform the rotating plastic melt into parallel linear motion, uniformly and stably introduce it into the mold sleeve, and apply the necessary forming pressure to the plastic. The plastic is plasticized and compacted in the barrel, and then flows through the multi-hole filter plate along a certain flow channel through the neck of the die head into the die head forming mold. The core and die sleeve are properly coordinated to form a circular gap with a continuously decreasing cross-section, so that the plastic melt forms a continuous and dense tubular coating layer around the core wire. To ensure the rationality of the plastic flow channels inside the die head and eliminate dead corners where plastic accumulates, a distribution sleeve is often installed. To eliminate pressure fluctuations during plastic extrusion, a pressure equalizing ring is also set up.
(5) The main machine barrel is electrically heated and water-cooled to automatically control the barrel temperature. The core of the screw can be cooled by water (oil) to control the temperature of the screw. The head of the machine is equipped with a pressure sensor for testing the melting temperature and pressure.
The air-cooled die surface hot cutting, granulation auxiliary machine and rotating blades are driven by AC motors with variable frequency speed regulation. The dehydration and drying system is composed of a centrifugal dehydrator, a drum vibrating screen, a air-blowing storage silo, etc.
Application scope
Single-screw extrusion units are mainly used for filling, blending, modification, addition, chlorination of rubber, plastic and engineering resins, as well as processing of polypropylene and super absorbent resins. Extrusion of degradable masterbatch, polyamide polycondensation and polyurethane addition polymerization reactions; Granulation of carbon powder and magnetic powder, preparation of insulation materials, sheath materials for cables, low smoke zero halogen flame retardant PVC cable materials and various silane cross-linked materials, etc. The small models are mainly used for scientific research and teaching.
Main features
Compact structure, easy to operate : The screw extrusion granulator is compact in design, occupies a small area, and is relatively easy to install and maintain. At the same time, its interface is intuitive and the operation mode is simple and easy to understand, enabling the operator to quickly get started and improve production efficiency .
High efficiency continuous production : The screw extrusion granulator can achieve a continuous and stable production process, avoiding waiting and switching times in batch production, thereby improving production efficiency. In addition, its efficient extrusion and granulation capabilities have significantly increased production speed .
High particle quality : Through the extrusion of the screw, the material can form regular-shaped, compact particles. These particles have high strength and good stability, which can meet the quality requirements of different industries .
Adjustable particle size : The screw extrusion granulator has the function of adjustable particle size. By replacing templates of different specifications or adjusting relevant parameters, the size of the particles can be conveniently changed to meet the requirements of different products. This flexibility enables the screw extrusion granulator to adapt to a variety of application scenarios .
Strong applicability : The screw extrusion granulator is suitable for a variety of materials, including raw materials in rubber, plastic, food, medicine, chemical and many other industries. Its wide applicability makes it an important equipment for granulation production in multiple industries .
Energy saving and environmental protection : The screw extrusion granulator can make full use of materials in the production process, reduce waste, and its energy-saving design also reduces energy consumption. In addition, it can reduce dust and exhaust emissions in line with environmental protection requirements .
