Plastic extruding and pelleting unit

Abstract

The invention discloses a plastic extruding and pelleting unit. The unit comprises a rack, a main extruder, a second extruder, a pelleting device, a third extruder and a first screen changing device,wherein the main extruder comprises a main material barrel and a main driving device, two main screws are arranged in the main material barrel, a main feeding port is formed in the front end of the main material barrel, and a main die head is connected to the rear end of the main material barrel; the second extruder comprises a second material barrel and a second driving device, a second screw isarranged in the second material barrel, a second feeding port is formed in the front end of the second material barrel, and a second die head is connected to the rear end of the second material barrel; and the third extruder comprises a third material barrel and a third driving device, a third screw is arranged in the third material barrel, a third feeding port is formed in the front end of the third material barrel, a third die head is connected to the rear end of the third material barrel, the third feeding port corresponds to the main die head in position, a feeding port of the first screenchanging device communicates with an outlet of the third die head, and a discharging port of the first screen changing device is positioned above the second feeding port. According to the unit, the plasticization of recycled plastic is more sufficient, and impurities in the plastic melt can be filtered out in the plasticization process.

Description

technical field [0001] The invention relates to a machine for making plastic granules, in particular to a plastic extrusion granulation unit. Background technique [0002] At present, a large amount of plastic waste is generated in the process of production and life. These plastic wastes cannot be degraded after being discarded into the natural environment, causing serious white pollution and damaging the environment. The recycling of plastic waste can reduce white pollution and protect the environment on the one hand, and save resources and improve economic benefits on the other hand. The way to recycle plastic waste is usually to extrude and granulate the recycled plastic waste to form plastic granules that can be used by downstream industries. [0003] The plastic extrusion granulation unit used for extrusion granulation of recycled plastics usually includes an extruder and a granulation device; in the process of extrusion granulation of recycled plastics, plastic waste ...

AI Technical Summary

Problems solved by technology

However, in the actual production process, the main extruder of the above-mentioned plastic extrusion granulation unit only further plasticizes the plastic melt formed by the main extruder through the second extruder, and the recycled plastic The plasticization is still not sufficient, and the properties of the obtained plastic particles are still not ideal

In addition, since the recycled plastic contains more impurities, in order to ensure the quality of the plastic pellets, the above-mentioned plastic extrusion granulation unit has certain requirements for the cleanliness of the recycled plastic. Cleaning of plastic, which takes a lot of time and reduces productivity

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