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Hyperspectral imaging for surface characterization
Using laser-hyperspectral-imaging for the control of surface pretreatment of plastics
Project duration
From: 01.03.2021 To: 29.02.2024Description
The quality of the pre-treatment of surfaces has a significant influence on subsequent processes such as bonding, printing, painting, laminating, or coating of components. The methods often used to characterize the activated surface, such as X-ray photoelectron spectroscopy or contact angle measurement, are either destructive, contaminate the surface or are only used industrially in the event of damage for reasons of cost and time.
In the research project, innovative laser-excited hyperspectral imaging (Laser-HSI) was used for non-destructive and contamination-free control of the surface pre-treatment after the treatment processes. HSI is a combination of digital imaging and spectroscopy. By using a laser, fluorescence can be excited in many plastics, which can be detected with a suitable HSI camera and used for quality assurance of the surface pre-treatment of plastics.
The materials used were polypropylene (PP) and Polycarbonate/Acrylonitrile Butadiene Styrene (PC/ABS) sheets, which were pre-treated using atmospheric-pressure plasma, low-pressure plasma with three different gases (oxygen, nitrogen, air) and flame treatment. The differently pretreated test plates were examined using Laser-HSI and an attempt was made to classify the different states of pre-treatment. Contact angle measurements and adhesion tests were carried out as reference measurements for the quality of the pre-treatment.
It was possible to classify the different pre-treatment states very well, particularly in the case of PP. It was also shown that the use of Laser-HSI is suitable for process-related, non-destructive testing of surface pre-treatments.
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