A working method of a crushed material dehumidification recovery device

Abstract

The invention discloses a crushed material dehumidifying and recovering device as well as a working method thereof. The device comprises a dehumidifying bin, wherein a feeding mechanism is arranged at a feeding port at the upper end of the dehumidifying bin, and a discharging mechanism is arranged at a discharging port at the lower end of the dehumidifying bin; the device is characterized in that an upper section of the dehumidifying bin is set as a feeding section, a middle section of the dehumidifying bin is set as a material evaporation drying section, and a lower section of the dehumidifying bin is set as a material collapsing section; a main heating mechanism communicating with the feeding section is mounted at a heating port on one side of the material collapsing section, and an auxiliary heating mechanism communicating with the feeding section is mounted at a heating port on the other side of the material collapsing section; an umbrella-shaped baffle disperser is transversely mounted inside the material evaporation drying section by the aid of a baffle supporting column. The device adopts a circulating structure, so that heat is recycled, the cost and energy are saved, and the device has the characteristics of simple technology, reasonable structure, high efficiency, capability of saving energy, good dehumidifying effect and the like.

Description

technical field [0001] The invention relates to the technical field of plastic processing, in particular to a working method of a crushed material dehumidification recovery device. Background technique [0002] Thermoplastic polyethylene film material is a waste and a renewable resource with good value. Recycling and granulating them or re-granulating them after modification can be used in a virtuous cycle to save resources and protect the environment. [0003] For thermoplastic polyethylene film materials, they need to be processed before they are sorted and sorted for regeneration and granulation. The current traditional recycling process is: sorting and sorting, cleaning, crushing, dehydration and granulation, and then transformation and granulation. The specific method is to process polyethylene Large pieces of membrane material are crushed into small pieces of 5 to 10 cm. However, the cleaned membrane has a large water content due to its small membrane area and water ab...

AI Technical Summary

Problems solved by technology

[0004] The first method: choose the film material wet extrusion granulation method. After the film is washed with water, it is directly sent to the wet granulator by the transmission belt for granulation. The principle is to lengthen the primary extrusion section at the discharge port of the extruder. The wet film fragments with extremely high water content are compressed by the extruder, and the pressure is generated in the extrusion plastic barrel with a short lead, forcing the wet film to squeeze out the water and flow out from the overflow hole at the bottom of the barrel. Although this method can About 90% of the water is extruded, but the remaining 10% of the water is brought into the heating section with the transmission of the screw, and vaporized in the screw barrel, although more than 5% of the water is discharged through the vent hole. water, but there is still a certain amount of water remaining, and the chemical reaction with polyethylene decomposition gas at high temperature produces carbon dioxide gas in the melt, resulting in the generation of oxides, causing the material to turn black and yellow, and seriously damage the quality of the recycled material. Reduce the use value and economic value of recycled materials;

[0005] The second way: centrifuge dehydration method, choose centrifugal dehydrator to dehydrate wet material, because the membrane material is flake, after absorbing water, the sheets absorb each other and the water-containing membrane material is grouped together, and dehydrated in the centrifugal dehydrator, after the grouping There is still more than 10% of the membranes adsorbing each other. Although the whole one-pot material is dehydrated at a high speed, it cannot meet the final requirements, and the dehydration work with a dehydrator is low in efficiency, consumes a lot of energy, and is labor-intensive;

[0006] The third way: hot air drying method, choose the broken membrane material for hot air blowing in the pipeline, the equipment investment is large, the process is complicated and the work efficiency is low, although the broken film can be blown relatively dry, but because the volume of the film material fragments is enlarged after drying The screw is difficult to eat when feeding at the feed port of the granulator, causing the extruder to run abnormally. This kind of efficiency is low, energy consumption is high, and labor intensity is high; this method is very unsatisfactory and is rarely used now;

[0007] The fourth method: extruder dry method, is actually the earlier method of the first method, that is, the extruder squeezes out the moisture of the broken film, when it is wet and squeezes in the extruder, although it squeezes out 9% Tens of moisture, but still part of the moisture is contained in the material during extrusion. When the material is extruded from the die of the extruder, the material is in a semi-molten state. At this time, the temperature reaches about 160 degrees Celsius, and then crushed. The method will not completely solve the moisture in the material, but will vaporize the moisture in the material, and the generated water vapor and polyethylene decomposition gas will produce carbon dioxide; although some people have used it for a period of time, due to the complicated and heavy process, especially the second crushing, Time-consuming and uneconomical, it is rarely used now

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