The Polyethylene terephthalate (PET) fiber is so sleek that its surface has high reflectance. Therefore it is difficulty to dye the PET fiber dark color by using the disperse dyes. In order to solve this problem, the laser processing technology is applied to change the surface dyeing property of the PET fiber. How to quantify the treated layer thickness of laser irradiated PET fabric and how to foretell its spectrum reflectivity distribution are two problems that needs the solution urgently. In this paper, both the simplified structure model and optical transmission model of PET fabric irradiated by laser are developed, the reflectance formula for laser irradiated PET fabric is derived. The characteristic parameters, both the equivalent optical thickness and the gain of dye strength, are introduced, which represented surface performance of laser irradiated PET fabric. When the equivalent optical thickness of the treated layer and the unit k/s ratio of the dyestuff are measured, the spectrum reflectivity distribution of the laser irradiated PET fabric for given concentrations of the various colorants can be calculated, thereby its tristimulus values can be obtained.

Date Published: 13 January 2005
PDF: 3 pages
Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); doi: 10.1117/12.570575

Published in SPIE Proceedings Vol. 5629:
Lasers in Material Processing and Manufacturing II
ShuShen Deng; Akira Matsunawa; Y. Lawrence Yao; Minlin Zhong, Editor(s)