Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Applications  > Automotive coatings  > Classification of batch processes in autom...

Wednesday, 18 September 2019
pdf
Raw materials & technologies, Applications, Automotive coatings

Classification of batch processes in automotive metallic coatings

Friday, 4 September 2015

Modern automotive metallic finishes contain flake-shaped pigments to create angle-dependent colour effects.

The principal components of reflectances are calculated at many viewing angles. Source: karlandreasgroß/Fotolia

The principal components of reflectances are calculated at many viewing angles. Source: karlandreasgroß/Fotolia

Colour quality control of batch productions is a critical issue that depends on the deposition of pigments in the basecoat and that requires spectrophotometric measurements at different viewing angles. Measurements on the car body and assembled add-on parts must be coincident with the colourimetric standards of a previously specified reference sample.

Pattern matching method for quality control

Spanish researchers propose a pattern matching approach for evaluation of batch productions in metallic coatings based on a principal component analysis similarity factor (PCASF) of reflectance spectra. Reflectance spectra were measured in metallic coatings by using a multi-angle spectrophotometer. The standard PCASF and a modified PCASF were examined at different viewing angles.

First case study

A first case study compares reflectance spectra of batches from different metallic colours that mainly exhibit a lightness flop from aluminum flakes. A second case study compares reflectance spectra of batches from the same metallic-paint application process. The results conclude that PCASFs are useful tools in spectroscopic quality control for classification, diagnosis and fault recognition of automotive metallic finishes in different painting applications and operating conditions.

The study is published in: Progress in Organic Coatings, Volume 88, November 2015, Pages 75-83.

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register