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A method and device for online identification of plastic materials

A technology of materials and plastics, applied in measuring devices, analyzing materials, and analyzing materials through optical means, can solve the problems of unrecognizable, large data volume, poor adaptability of waste materials, etc.

Inactive Publication Date: 2017-11-07
BEIJING GUOKE HONGPU PHOTOELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first type of technology measures the two-dimensional spectral curve of the substance in the near-infrared region, and compares it with the characteristic curve of the known material by means of principal component analysis and pattern recognition to determine the composition of the measured substance; when this type of technology identifies the material, it only relies on Due to the inherent spectral characteristics of a single material, it can identify and classify multiple materials at the same time. However, due to the large amount of measurement and processing data required, the system implementation is more complicated and the recognition speed is slow. It is difficult to meet the recognition speed requirements when dealing with waste plastic waste. Require
The second type of technology realizes material identification by measuring the radiation intensity transmitted or reflected by plastic samples at different wavelengths in the near-infrared range. Plastic waste contains many types of plastic materials, and this method cannot realize the identification of specific plastic materials in plastic waste raw materials

Method used

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  • A method and device for online identification of plastic materials
  • A method and device for online identification of plastic materials
  • A method and device for online identification of plastic materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] figure 1 It is a flowchart of a method for online plastic material identification provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the method mainly includes the following steps:

[0060] Step 11, establish recognition model; figure 2 As shown, it mainly includes:

[0061] Step A, sampling, collecting spectral data and preprocessing spectral data.

[0062] Select one or more samples from plastic products of various materials contained in waste plastic raw materials, and classify the samples into type a and non-a according to the plastic material a to be detected; perform spectrum measurement on each sample, and analyze the obtained spectrum The measurement result data is preprocessed; in actual work, samples can also be classified after preprocessing.

[0063] In the embodiment of the present invention, performing spectral measurement on each sample and preprocessing the obtained spectral measurement result data include: performing spe...

example 1

[0086] In this example, the identification and sorting of PVC plastics in waste plastic raw materials containing PVC and ABS are taken as an example (that is, the PVC material is designated as the aforementioned plastic material a). The implementation process includes the following steps:

[0087] 1) Collect 26 samples from waste plastic raw materials, use a standard spectrometer, measure the reflection spectrum curves of each sample with a spectral resolution of 3nm, and a wavelength range of 1100nm to 2000nm, and then perform 5-point smoothing and standard normalization with spectral processing software After chemical treatment, the spectral curve of each sample is obtained, and the samples are classified according to PVC and non-PVC materials, such as Figure 4 As shown, the curve marked with circles is the spectrum of PVC samples, and the curve marked with squares is the spectrum of ABS samples.

[0088] 2) After resampling the spectral data of the collected samples at 2nm...

example 2

[0098] In this example, PVC raw materials are identified and sorted from waste plastic raw materials composed of various plastic materials, including PVC, ABS, PA, PE, PET, PP, and PS. The implementation process includes the following steps:

[0099] A total of 70 samples were selected from waste plastic raw materials, and the spectral data were measured and classified. The spectral measurement and processing parameters were consistent with the previous example, and will not be repeated here.

[0100] Based on the sample spectral data, select the threshold T = 0.25 to calculate the overall identification matrix P 0 (m,n) and statistical matrix Q 0 (m,n). In this example the overall identification matrix P 0 (m,n) is an all-zero matrix, based on the statistical matrix Q 0 (m,n) selects the first pair of measurement wavelengths. For the numerical distribution of the statistical matrix and the index wavelength of the maximum element, see Figure 6 , according to which the fi...

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Abstract

The invention discloses a method and device for online identification of plastic materials. The method establishes a universal infrared spectrum identification model, and establishes an identification model according to the material types of identification raw materials, so as to identify specific plastic materials from waste plastic garbage The purpose is to reduce the environmental pollution caused by the waste disposal process. At the same time, by comprehensively analyzing the infrared spectral data of various materials and extracting feature information, the amount of spectral data to be measured in the identification process is reduced, the complexity of data processing is reduced, and the identification speed is improved. The device is realized based on this method. It has the ability to dynamically adjust and expand the measurement wavelength, has no special requirements on the material types of raw materials that can be processed, and has wide adaptability.

Description

technical field [0001] The invention relates to the technical field of material identification, in particular to a method and device for online identification of plastic materials. Background technique [0002] With the development of my country's plastics industry and the improvement of consumption levels, the application of plastic products in my country is everywhere from industrial and agricultural production to basic necessities of life. While bringing great material civilization to people, the generation of plastic waste has also brought a series of social and environmental problems. Waste plastics in municipal solid waste are usually composed of a mixture of various plastics, common types include: polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS) , acrylonitrile-styrene-butadiene copolymer (ABS), polyamide (PA), polycarbonate resin (PC), polyvinyl chloride (PVC), etc. [0003] Among them, PVC has been industrialized for more t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3563
Inventor 黄旻吕群波周锦松刘建东陶陶赵宝玮高国来
Owner BEIJING GUOKE HONGPU PHOTOELECTRIC TECH CO LTD
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