Methods for measuring and quantifying surface cleanability of articles
Disclosed are methods for quantifying the cleanability of a surface of an article, for instance an aircraft interior component. In embodiments, a solution containing an artificial “dirt” is introduced to a surface under test to simulate a sullied condition. The sullied surface is subjected to at least one cleaning process. Obtained reference and post-cleaning light measurements are compared to determine a measurement difference corresponding to a cleanability of the surface and/or effectiveness of the at least one cleaning process. In embodiments, the measurement difference is assigned a cleanability score for at least one of determining a passing or failing cleanability, modifying the cleaning process, indicating the need for a second or subsequent cleaning, modifying the barrier coating formulation, redesigning the article, etc. The disclosed methods provide solutions for objective verification measures of surface cleanability used to facilitate new article designs, materials, barrier coatings, cleaning processes, cleaners, etc.
1. A method for determining cleanability of a surface of an article, comprising the steps of:
providing an article having a surface to be cleaned;
providing a solution comprising an ATP component, in a diluted amount, measurable in relative light units (RLUs) using an adenosine triphosphate (ATP) bioluminescence meter;
applying the solution to the surface of the article;
obtaining, using an ATP bioluminescence meter configured to measure relative RLUs, a reference light measurement of the surface;
subjecting the surface of the article having the solution applied thereto to a cleaning process;
obtaining, using the ATP bioluminescence meter, a light measurement of the cleaned surface; and
quantifying, based on a measurement difference between the obtained reference light measurement and the obtained light measurement of the cleaned surface, cleanability of the surface of the article;
wherein each of the obtained reference light measurement and the quantified measurement difference between the reference light measurement and the light measurement of the cleaned surface are expressed as a percentage, and wherein the obtained reference light measurement corresponds to a 100% sullied surface, a 100% difference between the obtained reference light measurement and the obtained light measurement of the cleaned surface corresponds to a completely unsullied surface, and less than a 100% difference between the obtained reference light measurement and the obtained light measurement of the cleaned surface corresponds to a partially sullied surface.
2. The method according to claim 1 , wherein the percentage difference between the obtained reference light measurement and the obtained light measurement of the cleaned surface corresponds to a surface cleanability score, and wherein a surface cleanability score greater than about 50% corresponds to a passing score.
3. The method according to claim 1 , wherein the percentage difference between the obtained reference light measurement and the obtained light measurement of the cleaned surface corresponds to a surface cleanability score, and wherein a surface cleanability score less than about 50% corresponds to a failing score.
4. The method according to claim 1 , wherein the percentage difference between the obtained reference light measurement and the obtained light measurement of the cleaned surface corresponds to a surface cleanability score, and wherein a surface cleanability score greater than about 75% corresponds to a passing score.
5. The method according to claim 1 , wherein the percentage difference between the obtained reference light measurement and the obtained light measurement of the cleaned surface corresponds to a surface cleanability score, and wherein a surface cleanability score less than about 75% corresponds to a failing score.
6. The method according to claim 1 , wherein the ATP component provided in the solution is ATP disodium salt.
7. The method according to claim 1 , wherein the surface of the article comprises a barrier coating providing against at least one of fluids, disinfectants, chemicals and ultra violet (UV) light.
8. The method according to claim 1 , wherein the ATP component in the solution comprises less than about 75% by volume of the solution.
9. The method according to claim 1 , wherein the ATP component in the solution comprises less than about 50% by volume of the solution.
10. The method according to claim 1 , wherein the cleaning process comprises the steps of:
applying a cleaning solution to the surface of the article; and
removing the cleaning solution from the surface of the article.