Single-screw plastic extrusion test machine is also known as laboratory single-screw extruder. Laboratory single-screw extruder is mainly used for research on polymer plastics. The main feature is that the screw diameter is small, which greatly reduces the amount of materials used in application research and development.

Overview

Single-screw plastic extrusion test machine Laboratory single-screw extruder Lab Single-Screw Extruder

Single-screw plastic extrusion test machine is also known as laboratory single-screw extruder. Laboratory single-screw extruder is mainly used for research on polymer plastics. It is mainly used for research and development in universities, enterprises and research institutes. The main feature is that the screw diameter is small, which greatly reduces the amount of materials used in application research and development.

Directory

Single-screw plastic extrusion test machine

Extrusion system

Extruder features

Edit this section Single-screw plastic extrusion test machine

Single-screw plastic extrusion test machine adopts a single reducer, a single barrel, and the screw adopts regular profiles and high-quality carbon steel.

Special requirements: High-strength, corrosion-resistant alloy steel is made through multi-stage heat treatment and finishing, dehydrated and exhausted, and can be equipped with heat transfer oil energy-saving device, with low energy consumption ratio.

Edit this section Extrusion system

The extrusion system includes screw, barrel, hopper, die, and mold. The plastic is plasticized into a uniform melt through the extrusion system, and is continuously extruded out of the die by the screw under the pressure established in this process.

(1) Screw: It is the most important component of the extruder. It is directly related to the application range and productivity of the extruder. It is made of high-strength, corrosion-resistant alloy steel.

(2) Barrel: It is a metal cylinder, generally made of heat-resistant, high-compression strength, strong, wear-resistant and corrosion-resistant alloy steel or a composite steel pipe lined with alloy steel. The barrel and the screw work together to crush, soften, melt, plasticize, exhaust and compact the plastic, and continuously and evenly transport the rubber material to the molding system. The length of the barrel is generally 15 to 30 times its diameter, so that the plastic can be fully heated and fully plasticized.

(3) Hopper: The bottom of the hopper is equipped with a cut-off device to adjust and cut off the material flow. The side of the hopper is equipped with a sight hole and a calibration metering device.

(4) Die and mold: The die is composed of an alloy steel inner sleeve and a carbon steel outer sleeve. The die is equipped with a molding mold. The function of the die is to convert the rotating plastic melt into parallel linear motion, evenly and steadily introduce it into the mold sleeve, and give the plastic the necessary molding pressure. The plastic is plasticized and compacted in the barrel, and flows into the die molding mold through the porous filter plate along a certain flow channel through the neck of the die. The mold core and the mold sleeve are properly matched to form an annular gap with a continuously decreasing cross-section, so that the plastic melt forms a continuous and dense tubular coating around the core wire. In order to ensure the reasonable flow of plastic in the die and eliminate the dead corners of accumulated plastic, a diverter sleeve is often installed. In order to eliminate pressure fluctuations during plastic extrusion, an equalizing ring is also installed. The die head is also equipped with a mold correction and adjustment device to facilitate the adjustment and correction of the concentricity of the die core and the die sleeve. An equalizing ring is installed at the front of the die head to balance the pressure; the extrusion molding part consists of a die sleeve seat and a die sleeve. The position of the die sleeve can be adjusted by bolts through the support to adjust the relative position of the die sleeve to the die core, so as to facilitate the adjustment of the uniformity of the thickness of the extruded layer. A heating device and a temperature measuring device are installed on the outside of the die head.

Edit this section Extruder Features

1. The single-screw granulator integrates refining, lifting, feeding, extrusion, air-cooled hot cutting, and air-conveying cooling to achieve automatic continuous operation. Such a single-screw granulator has high production efficiency;

2. The single screw granulator has the mixing, feeding and extrusion sections. Electric heating, steam heating or hot oil circulation heating technology can be selected according to the customer's temperature control requirements. According to the different materials to be produced, the temperature requirements are also different.

3. The mixer adopts the technology of "four-sided synchronous wear-resistant mixing chamber", which has high efficiency, low energy consumption, sufficient plasticization and uniform dispersion;

4. The feeding device adopts the company's unique technology, which can assist in mixing the mixed materials and force feed the single screw extruder to improve the efficiency and quality of granulation;

5. The drive of the double conical screw and the single screw adopts AC frequency conversion technology, which can adapt to various process technology requirements;

6. The front part of the head adopts a hydraulic fast screen changing device, which saves time and effort and is environmentally friendly;

7. The granulator adopts a rotary knife disc and a fine-tuning device for air-cooled hot cutting;

8. The cooling of pellets adopts cyclone separator conveying and drum cooler or disc vibrating screen;

9. The electric control system adopts PLC, visual interface and frequency conversion technology to realize full automatic control.

Configuration:

Different equipment can be added according to different needs, such as adding film blowing machine, cast film machine, bottle blowing machine. Multiple single screw extruders can be configured according to needs to form multi-layer film blowing machine and multi-layer cast film machine. Of course, there is no problem with multi-layer bottle blowing machine, but few friends consult. Generally, there will be more demand for multi-layer film blowing machine and multi-layer cast film machine.