A PRESENTATION OF AN EVALUATION METHOD AND ITS ACCOMPANYING INDEX FOR CIGARETTE SMOKE STAIN ON WALL FINISHING MATERIALS

摘要

In Part 2, we designed two types ostain accelerating devices. In this Part, we adopted the device which we thoughtould reproduce stains closer to the real stains and made a sensory test on materials exposed to the air in a smoking room and materials stained by the device. Ater careful consideration of the results of the sensory test, we created the evauating scale for cigarette smoke stain, and concluded that the physical quantity(color differential + △ b*)indicated the state of stain (△b*: the change quantthe CHROMATIC index of stained and un-stained materials).In what follows, we wil show a way of evaluating cigarette smoke stain on the basis of the relationship between the stain evaluating scale and the physical quantity of materials and present the evaluation index and the evaluation method for stain.