A novel sink mark model for high gloss injection molded parts – Correlation of deflectometric and topographic measurements

This paper introduces a mathematical model which approximates the topographic shape of punctiform sink marks to a Gaussian-bell-like function. Such a model enables the description of sink mark shapes with few parameters, and the calculation of features which can be used to describe the visibility of...

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Bibliographic Details
Published in:Polymer testing 2014-10, Vol.39, p.12-19
Main Authors: Macher, Johannes, Gruber, Dieter P., Altenbuchner, Thomas, Pacher, Gernot A., Berger, Gerald R., Friesenbichler, Walter
Format: Article
Language:English
Subjects:
Applied sciences
Correlation analysis
Deflection
Deflectometry
Exact sciences and technology
Injection molding
Injection moulding
Machinery and processing
Mathematical models
Measurement methods
Moulding
Plastics
Polymer industry, paints, wood
Quality inspection
Sink mark
Sink mark model
Sink marks
Technology of polymers
Topographic measurement
Topography
Visibility
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Description
Summary:This paper introduces a mathematical model which approximates the topographic shape of punctiform sink marks to a Gaussian-bell-like function. Such a model enables the description of sink mark shapes with few parameters, and the calculation of features which can be used to describe the visibility of the sink marks. The topography of test series of sink marks on black high-gloss plastic parts was measured with a chromatic coding confocal microscope. The obtained data was fitted to the model which enables calculation of a sink mark's amplitude and volume. These two parameters are proposed to feature a sink mark's intensity. The results were compared to deflectometric measurements of the sink marks. Despite the fact that the two measurement methods are based on different principles, the results show high correlation. Especially, the behavior of sink mark volumes agreed well with the behavior of sink mark intensity which was measured using deflectometry. Therefore, the model also represents a viable option for the calibration of deflectometric applications. Additionally, the model can be used in future to simulate sink mark properties such as visual perceptibility.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2014.07.001