| Titre : |
Improvements in gakushin wear testing through laboratory automation |
| Type de document : |
texte imprimé |
| Auteurs : |
B. Hageman, Auteur ; J. Hoefler, Auteur ; J. Gregory, Auteur ; W. Stapelkamp, Auteur |
| Année de publication : |
2013 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuir teint
Cuirs et peaux -- Propriétés mécaniques
Essais accélérés (technologie)
Essais accélérés (technologie) -- Appareils et matériels
Frottements (mécanique)
Solidité de la couleur
Usure (mécanique)
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Coatings designed for leather finishes are subjected to ever increasing performance specifications, requiring accurate assessments to properly judge performance. Unfortunately, the results of many tests utilized to determine leather finish performance are plagued by high levels of variability. One such test is the Gakushin wear resistance test, which is required by a number of Japanese auto manufacturers, but can be used more generally to measure wear performance important to most automotive OEMs. Gakushin wear testing also requires intensive operator monitoring over lengthy test cycles and does not present an easily determined endpoint. It is therefore often run unmonitored as a pass/fail test, forfeiting the potential to detect performance gradients among samples.
In order to address these challenges, a new system has been developed that preserves the critical components of the wearing system, but adds automation and imaging systems that allow it to run completely unattended. A digital control circuit that periodically interrupts the wearing cycle initiates the capture and storage of high resolution images of the leather samples under test. After the test is completed, the operator is able to view the sequential images, selecting the exact point of coating failure. One benefit of this system is higher productivity, since the test can be run unattended. Also, since the operator is able to evaluate images of the coating both before and after the selected endpoint, the error associated with endpoint detection is minimized and the test yields more precise data than when performed in pass/fail mode. This combination of higher productivity and more precise endpoint detection facilitates the use of statistical data analysis on the results. In addition, the images showing coating wear following the endpoint allow an analysis of failure mode. These factors combine to make the improved Gakushin instrument a potent product development tool for wear resistant topcoats. |
| Note de contenu : |
- INTRODUCTION : General - Description of gakushin wear test - Advantages and disadvantages of the gakushin test - Gakushin test variability - Instrument automation
- EXPERIMENTAL : Automated instrument - VERALAB user interface - VERALAB image player - Leather finishes - Crust preparation - Topcoat
- RESULTS AND DISCUSSION : Gakushin testing - JMP analysis - Validation of model - Validation of effects - Coating performance - Comparison of abrasion method |
| En ligne : |
https://drive.google.com/file/d/1tDiQ3R2L4IrJhwanPAhbCFuRD2o3EGLM/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18743 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 6 (06/2013)
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