Mixed waste plastics is difficult to recycle or reuse value is not high, waste plastics must be classified in order to achieve the purpose of effective recycling. Plastic sorting technology many, there are vibration sorting, air separation, liquid separation, electromagnetic Sorting and photoelectric sorting technology.
1, vibration sorting technology
Vibration sorting technology is the use of vibration bed reciprocating motion, the material on the bed to bring the role of vibration.Main principle is the use of materials and the friction between the bed and the inertia force, the formation of particles of different displacement movement and through The difference between the material particles to achieve the separation effect.Vibration separation in the processing of materials with a large difference between the results of sorting ah better.
Vibration separation of 75% plastic and 25% metal
2, air separation technology
Airflow sorting, also known as wind sorting, enables materials to be sorted by blowing a mixture of waste plastics and other materials with a stream of air, where materials of higher density fall farther apart and materials of lighter density fall.
Different plastic density range
Spiral air separation
Spiral air separation equipment diagram
Pneumatic, fluidized bed sorting
Pneumatic, fluidized bed sorting equipment schematic
3, liquid separation technology
Liquid separation technology is the use of liquid and plastic particles density difference, to achieve the separation of different types of waste plastics.Research found that the factors that affect the separation efficiency of plastic material density, plastic material properties and size.
Different shapes and sizes of waste plastic flow sorting effect
Fractional flow sorting
Fractional flow separation equipment schematic
Fluidized flow control sorting
Fluid flow control sorting equipment structure and physical map
4, electromagnetic sorting technology
Magnetic separation technology is the use of magnetic separation of various materials, magnetic force and other forces under the separation of the technology.Electrostatic separation technology is the use of various plastic conductivity and the electrostatic field of the plastic on the performance of the electrical separation. Electromagnetic separation technology is the role of static and magnetic separation with the role.
Frictional electrification series of plastic
Electromagnetic separation equipment schematic
5, photoelectric sorting technology
Photoelectric sorting is based on the different spectral properties of different plastics automated sorting, and is divided into absorption spectroscopy (such as infrared, UV absorption spectroscopy), emission spectroscopy (such as fluorescence spectroscopy) and scattering spectroscopy (such as Raman spectroscopy) Etc. The three elements of the infrared spectrum of the plastic material are the position, shape and intensity of the peak.
Sensor-based sorting system
In accordance with the detection principle of the sensor sorting, automatic sorting technology is divided into the following six categories:
Color Recognition Sensor (COLOR)
Through the analysis of visible light, infrared, ultraviolet and other range of spectrum, identify the color of the material sorting
Near Infrared Sensor (NIR)
According to the different materials reflected by the different reflection spectra were sorted to determine.
X-ray radiography (XRT)
According to the different types of materials of different atomic density, sorting judgment.
Electromagnetic sensor (EM)
According to different conductivity and permeability of the material to be sorted to determine.
Visible spectrum sensor (VIS)
Transparent, opaque material for visible spectrum identification and sorting judgments.
X-ray fluorescence (XRF)
According to the atomic properties of the material sorting judge