Centrifugal extruder

An extruder and centrifugal technology, which is applied in the field of screw extruders, can solve the problems of energy waste and large friction loss, and achieve the effects of reducing energy consumption, reducing friction energy consumption, and improving heating efficiency

Inactive Publication Date: 2007-01-03
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In addition to pressurizing and transporting the plastic, a considerable part of the driving energy in the feeding section is converted into frictional heat, and only a part of this frictional heat is converted into the temperature rise of the plastic, and a considerable part is transmitted to the surrounding air through the barrel, or through cooling. The medium is taken away, causing a lot of energy waste
Especially at present, the feeding section of the single-screw extruder mostly uses slotted barrels to increase output and improve extrusion stability, resulting in greater friction loss

Method used

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  • Centrifugal extruder

Examples

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Embodiment 1

[0012] Taking the extrusion of high-density polyethylene pellets as an example, the equipment structure is as follows figure 1 As shown, the maximum diameter at the outlet of the centrifugal feeding drum 3 is Φ200mm, the inner cone angle of the drum 3 is 70°, and the cone angle of the inner core 5 is 45°. The outlet of the feeding sleeve 6 is a 70×30 rectangular hole, the rotating speed of the centrifugal feeding drum 3 is 1800 rpm, the heating temperature of the centrifugal feeding drum 3 and the feeding sleeve 6 is 100-160°C, the heating of the barrel 10 The temperature is 180-190°C, the diameter of the screw is Φ45, and the aspect ratio is 17. The screw grooves on the front 7D length of the screw are equidistant and gradual grooves, and the rear 10D lengths are equidistant and equal depth grooves. The screw speed is 10-100 rpm, and the driving power of the motor-reducer 9 is 1 / 2 of the driving power of the common ф45 extruder motor. However, the driving power of the motor ...

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Abstract

The centrifugal extruder has one material feeder, which is one rotating conic feeding drum and has inner core inside the drum, turned conic feeding sleeve with spiral guide slot in the inner wall, heater on the outer wall of the drum and the feeding sleeve, extruder barrel with material inlet connected to the bottom of the feeding sleeve, and fusing section corresponding to the material inlet. The material fed to the drum produces centrifugal force in the rotating conic drum and is applied with force for sliding downward along the drum wall and positive pressure from the drum wall as well as stagnation effect of the guide slot to convert the kinetic energy to the static pressure for being pushed to the fusing section, densified and fused. Therefore, the present invention has effectively lowered power consumption.

Description

technical field [0001] The present invention relates to a screw extruder, in particular to the improvement of the extruder feeding and screw material delivery methods, which can be used for continuous extrusion molding of polymers, especially thermoplastic extrusion molding, not only suitable for granular It is also suitable for the extrusion of powdery raw materials. Background technique [0002] The extrusion part of an ordinary single-screw extruder is generally divided into three functional sections, namely, the feeding section, the melting section and the homogenizing section. The function of the feeding section is to convey, compact and heat the granular or powdery plastic materials to the melting temperature. The material transportation mainly depends on the propulsion of the screw flight. In order to prevent the materials from rotating with the screw, the materials and the inner surface of the barrel Greater friction is required. The role of the melting section is ...

Claims

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Application Information

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IPC IPC(8): B29C47/10B29C47/78B29C48/793
CPCB29C48/793
Inventor 吴大鸣陈卫红范德顺汪冯新许红刘颖赵晶
Owner BEIJING UNIV OF CHEM TECH
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