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Method for sorting broken plastics in waste household appliances through near infrared absorption spectroscopy analysis device

A near-infrared spectroscopy and sorting technology, applied in the field of resource utilization and waste plastic treatment, can solve the problems of operator health threat, low accuracy of separating plastics, environmental pollution, etc., to eliminate pollution and harm, avoid low accuracy, The effect of high efficiency and accuracy

Inactive Publication Date: 2017-02-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While solving the problem of low accuracy of separating plastics by traditional chemical methods, it also avoids environmental pollution and health threats to operators by using chemical reagents

Method used

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  • Method for sorting broken plastics in waste household appliances through near infrared absorption spectroscopy analysis device
  • Method for sorting broken plastics in waste household appliances through near infrared absorption spectroscopy analysis device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Select a plastic mixture composed of two plastics, PS and PP, and add it to the photoelectric separator (such as figure 2 Shown) in the near-infrared spectrum identification process. specific:

[0032] Step 1. Add standard PS plastic sheets to the photoelectric sorter (such as figure 2 As shown), the plastic flakes pass through the vibrating dispersing sieve 1 in turn, and the crushed plastics are vibrated and dispersed through the feeding dispersing sieve 1. When they enter the flake conveyor belt 2, they will be accelerated suddenly, so that the flakes do not overlap and are evenly distributed on the conveyor belt. distributed.

[0033] Step 2: When the flakes pass through the data collection area 4 irradiated by the full-spectrum light source evenly and without overlapping, the optical fiber receives the light reflected by the flakes and transmits it to the near-infrared spectrometer 7 .

[0034] Step 3: In the industrial control host 3, the spectral data is seq...

Embodiment 2

[0039] Select a plastic mixture composed of three plastics, PS, PP, and ABS, which are recycled in the refrigerator, and add it to a photoelectric separator (such as figure 2 Shown) in the near-infrared spectrum identification process. specific:

[0040] Step 1. Add standard PS plastic sheets to the photoelectric sorter (such as figure 2 As shown), the plastic flakes pass through the vibrating dispersing sieve 1 in turn, and the crushed plastics are vibrated and dispersed through the feeding dispersing sieve 1. When they enter the flake conveyor belt 2, they will be accelerated suddenly, so that the flakes do not overlap and are evenly distributed on the conveyor belt. distributed.

[0041] Step 2: When the flakes pass through the data collection area 4 irradiated by the full-spectrum light source evenly and without overlapping, the optical fiber receives the light reflected by the flakes and transmits it to the near-infrared spectrometer 7 .

[0042] Step 3: In the indus...

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Abstract

The invention provides a method for sorting broken plastics in waste household appliances through near infrared absorption spectroscopy analysis. The method is characterized in that after being broken and sorted, the broken plastics in the waste household appliances can mainly absorb the light at the infrared wave band while passing through a full-spectrum light source; the rays which are reflected by sheets and are being 720 to 1700 nm in wavelength can be collected through a near infrared spectrometer; the spectral data can be subjected to noise reduction by the least square method through an industrial host computer and smooth processing through Gaussian fitting, and then subjected to Gaussian approximation, so as to extract the wavelength n and the FWHM (Full Width at Half Maximum) corresponding to the data characteristic value; and the wavelength n and the FWHM are compared with the standard characteristic value of the spectrum of the plastics, and the comparing result serves as a triggering condition to control a mechanical sorting structure so as to sort the plastics of different types. With the adoption of the method, the problems of difficult sorting of the broken plastics in the waste household appliances and low accuracy can be solved; the pollution and damage caused by the chemical separation of the waste plastics in the household appliance can be removed; a complete set of recognizing and sorting methods for the waste broken plastics can be created and can be specifically applied to the industry.

Description

technical field [0001] The invention relates to the field of waste plastic treatment and resource utilization in the technical field of environmental protection, in particular to a fast on-line non-contact sorting method for dismantled and broken plastic pieces of waste household appliances. Background technique [0002] Compared with some easily degradable wastes, the structure of plastic is stable, and the average natural degradation time is 300 to 500 years, or even more. As time goes by, these plastic wastes that have not been effectively treated are causing great harm to the earth's limited land resources and the environment. Plastic products come from petroleum. As we all know, petroleum resources will be exhausted in the near future, and the recycling of waste plastics will become an effective way to alleviate the depletion of petroleum resources. At present, my country's sorting efficiency of waste plastics for household appliances is extremely low, the cost of huma...

Claims

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Application Information

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IPC IPC(8): B29B17/02B07C5/342B07C5/38
CPCB07C5/342B07C5/38B29B17/02B29B2017/0203B29B2017/0279Y02W30/62
Inventor 李佳许振明李超
Owner SHANGHAI JIAO TONG UNIV
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