1. Label removal of drum impurity removal bottle
The big bag of compressed bottles is scattered by unloading, and the loose bottles are sent to the rotatable drum, and the bottles are fully stirred to remove dirt such as sand and dust on the label and bottle surface. Metal impurities are removed by strong magnetism in the feeding process. Then enter the label blowing unit, and the labels and other debris are sent to the collection system.
2. Automatic sorting
The whole bottle without PVC label is picked out by the automatic bottle picking machine and washed in the whole bottle, and other non-PET bottles, variegated bottles and metallic or nonmetallic impurities enter the secondary line.
3. Wash the whole bottle
After automatic sorting, the whole bottle is cleaned, and the surface of the bottle is cleaned. The water on the surface of the bottle is removed by vibrating screen, which is convenient for the next bottle sorting. After the process water is filtered by the filter, it is collected by the recovery tank and reused after the temperature and chemical composition are adjusted.
4, in addition to the label
Remove the labels separated from the whole bottle by high-speed label removal equipment.
5. Automatic sorting
Automatic sorting equipment, using near infrared spectrum analysis and high-speed CCD camera identification method to sort bottles.
6. Manual sorting and metal detection
Will automatically sort the missing content.
(3) pulverizing
In this section, the bottle is cut into small pieces, which is convenient for the next material treatment and chemical cleaning to remove pollutants from the material.
The sorted bottles are automatically diverted and fed into the feeding trough of the pulverizer as required. The material is first wet crushed and cut and crushed by a rotating cutter. All the remaining label papers in the last section became slurry, and the water and debris were mixed and sent to the centrifuge. Under the action of horizontal centrifuge, the debris is separated from the waste liquid containing a large amount of fines and pulp, and the debris is transferred to the next cleaning line by pneumatic conveying. The waste liquid with a lot of impurities flows into the filter, and the water is collected by the recovery tank after filtration, and then returned to the pulverizer for recycling.
(4) Floating washing
According to different densities, the floating PP, PE bottle caps and labels are separated from PET.
(5) cleaning
In the cleaning section, firstly, the residual glue on the surface of the material is removed in a reaction in which the temperature and chemicals are controlled, then other contaminants are separated by rinsing, and finally the material is dried.
The chips are fed into the mixing bin by pneumatic conveying device, and after being fully mixed, the uniform material flow output by the screw is fed into the cleaning reactor to carry out chemical cleaning on the chips. The mixture of cleaned debris and cleaning solution is pumped into a horizontal centrifuge, and the centrifuge separates the debris from the cleaning solution. The debris is fed into a multistage cleaning centrifuge for mechanical cleaning. During the multistage cleaning process, all impurities on the surface of the debris are removed through the joint action of chemistry and machinery. The multistage cleaning device can control the PH value, liquid/solid ratio, reaction time, reaction temperature and other parameters of the mixed solution. After multistage cleaning, the fragments are sent to a centrifugal separator to separate the materials from the cleaning solution. In this process, the process water separated by horizontal centrifuge and centrifugal separator is treated by filter, collected by recovery tank, added with chemicals and returned to cleaning reactor by pump.
Debris is dehydrated by centrifugal separator and sent to rinsing reactor for hot rinsing. The rinsing reactor is a high-stirring tank with a washing water circulation system and a centrifugal pump, which can carry out large-capacity hot rinsing and cold rinsing operations. After many previous cleaning processes, the surface impurities have been basically removed, but some impurities and detergent residues still remain. Therefore, the chips still need to be rinsed. Firstly, the chips are fed into a rinsing reactor for thermal rinsing. During this process, the chips are further purified by strong centrifugal force and a large amount of water to remove impurities such as detergent residues. Aft hot rinsing, that chip are fed into a centrifugal separator, and after dehydration, the chips are fed into a polyolefin separation tank by pneumatic conveying; aft density separation, the high-density PET chips are conveyed to a cold rinsing tank by a screw conveyor, and the low-density polyolefin substances are collected by a special screw conveyor.
In the rinsing process, special water circulation devices are respectively set for hot rinsing, polyolefin separation and cold rinsing to recycle the process water.
(5) drying and screening
The cleaned materials must be dried. Clean polyester chips are dehydrated and dried by centrifuge, and then enter the dryer in turn. Air flow is transported between two dryers, and hot air for drying is generated by electric heater.
The materials are sent to the color sorter through the pneumatic conveying system, so as to separate the variegated materials possibly mixed in the finished product. .
(6) storage and packaging
The qualified polyester chips are transported to the online mixing silo by airflow. The mixing bin is equipped with a stirrer to make the materials mix evenly. The material is transported to the pneumatic separation device by the airflow, and the material dust suspended in the airflow is separated and then enters the analysis bin. One third of the qualified clean polyester chips are sent to the packaging station to be packaged into bags, which are delivered as finished products. The remaining 2/3 clean polyester chips are transported by airflow to the melting and extrusion section, and further processed into recycled bottle-grade polyester chips.